+++ /dev/null
-config AUFS_FS
- tristate "Aufs (Advanced multi layered unification filesystem) support"
- depends on EXPERIMENTAL
- help
- Aufs is a stackable unification filesystem such as Unionfs,
- which unifies several directories and provides a merged single
- directory.
- In the early days, aufs was entirely re-designed and
- re-implemented Unionfs Version 1.x series. Introducing many
- original ideas, approaches and improvements, it becomes totally
- different from Unionfs while keeping the basic features.
-
-if AUFS_FS
-choice
- prompt "Maximum number of branches"
- default AUFS_BRANCH_MAX_127
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_127
- bool "127"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_511
- bool "511"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_1023
- bool "1023"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_32767
- bool "32767"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-endchoice
-
-config AUFS_HNOTIFY
- bool "Detect direct branch access (bypassing aufs)"
- help
- If you want to modify files on branches directly, eg. bypassing aufs,
- and want aufs to detect the changes of them fully, then enable this
- option and use 'udba=notify' mount option.
- It will have a negative impact to the performance.
- See detail in aufs.5.
-
-
-choice
- prompt "method" if AUFS_HNOTIFY
- default AUFS_HFSNOTIFY
-config AUFS_HFSNOTIFY
- bool "fsnotify"
- select FSNOTIFY
-config AUFS_HINOTIFY
- bool "inotify (DEPRECATED)"
- depends on INOTIFY
-endchoice
-
-config AUFS_EXPORT
- bool "NFS-exportable aufs"
- depends on (AUFS_FS = y && EXPORTFS = y) || (AUFS_FS = m && EXPORTFS)
- help
- If you want to export your mounted aufs via NFS, then enable this
- option. There are several requirements for this configuration.
- See detail in aufs.5.
-
-config AUFS_INO_T_64
- bool
- depends on AUFS_EXPORT
- depends on 64BIT && !(ALPHA || S390)
- default y
- help
- Automatic configuration for internal use.
- /* typedef unsigned long/int __kernel_ino_t */
- /* alpha and s390x are int */
-
-config AUFS_RDU
- bool "Readdir in userspace"
- help
- Aufs has two methods to provide a merged view for a directory,
- by a user-space library and by kernel-space natively. The latter
- is always enabled but sometimes large and slow.
- If you enable this option, install the library in aufs2-util
- package, and set some environment variables for your readdir(3),
- then the work will be handled in user-space which generally
- shows better performance in most cases.
- See detail in aufs.5.
-
-config AUFS_SP_IATTR
- bool "Respect the attributes (mtime/ctime mainly) of special files"
- help
- When you write something to a special file, some attributes of it
- (mtime/ctime mainly) may be updated. Generally such updates are
- less important (actually some device drivers and NFS ignore
- it). But some applications (such like test program) requires
- such updates. If you need these updates, then enable this
- configuration which introduces some overhead.
- Currently this configuration handles FIFO only.
-
-config AUFS_SHWH
- bool "Show whiteouts"
- help
- If you want to make the whiteouts in aufs visible, then enable
- this option and specify 'shwh' mount option. Although it may
- sounds like philosophy or something, but in technically it
- simply shows the name of whiteout with keeping its behaviour.
-
-config AUFS_BR_RAMFS
- bool "Ramfs (initramfs/rootfs) as an aufs branch"
- help
- If you want to use ramfs as an aufs branch fs, then enable this
- option. Generally tmpfs is recommended.
- Aufs prohibited them to be a branch fs by default, because
- initramfs becomes unusable after switch_root or something
- generally. If you sets initramfs as an aufs branch and boot your
- system by switch_root, you will meet a problem easily since the
- files in initramfs may be inaccessible.
- Unless you are going to use ramfs as an aufs branch fs without
- switch_root or something, leave it N.
-
-config AUFS_BR_FUSE
- bool "Fuse fs as an aufs branch"
- depends on FUSE_FS
- select AUFS_POLL
- help
- If you want to use fuse-based userspace filesystem as an aufs
- branch fs, then enable this option.
- It implements the internal poll(2) operation which is
- implemented by fuse only (curretnly).
-
-config AUFS_POLL
- bool
- help
- Automatic configuration for internal use.
-
-config AUFS_BR_HFSPLUS
- bool "Hfsplus as an aufs branch"
- depends on HFSPLUS_FS
- default y
- help
- If you want to use hfsplus fs as an aufs branch fs, then enable
- this option. This option introduces a small overhead at
- copying-up a file on hfsplus.
-
-config AUFS_BDEV_LOOP
- bool
- depends on BLK_DEV_LOOP
- default y
- help
- Automatic configuration for internal use.
- Convert =[ym] into =y.
-
-config AUFS_DEBUG
- bool "Debug aufs"
- help
- Enable this to compile aufs internal debug code.
- It will have a negative impact to the performance.
-
-config AUFS_MAGIC_SYSRQ
- bool
- depends on AUFS_DEBUG && MAGIC_SYSRQ
- default y
- help
- Automatic configuration for internal use.
- When aufs supports Magic SysRq, enabled automatically.
-endif
+++ /dev/null
-EXTRA_CFLAGS += -I$(src)/include
-
-include ${src}/magic.mk
-ifeq (${CONFIG_AUFS_FS},m)
-include ${src}/conf.mk
-endif
--include ${src}/priv_def.mk
-
-# cf. include/linux/kernel.h
-# enable pr_debug
-ccflags-y += -DDEBUG
-ccflags-y += -D'pr_fmt(fmt)="aufs %s:%d:%s[%d]: " fmt, \
- __func__, __LINE__, current->comm, current->pid'
-
-obj-$(CONFIG_AUFS_FS) += aufs.o
-aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \
- wkq.o vfsub.o dcsub.o \
- cpup.o whout.o plink.o wbr_policy.o \
- dinfo.o dentry.o \
- dynop.o \
- finfo.o file.o f_op.o \
- dir.o vdir.o \
- iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \
- ioctl.o
-
-# all are boolean
-aufs-$(CONFIG_SYSFS) += sysfs.o
-aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o
-aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o
-aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o
-aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o
-aufs-$(CONFIG_AUFS_HINOTIFY) += hinotify.o
-aufs-$(CONFIG_AUFS_EXPORT) += export.o
-aufs-$(CONFIG_AUFS_POLL) += poll.o
-aufs-$(CONFIG_AUFS_RDU) += rdu.o
-aufs-$(CONFIG_AUFS_SP_IATTR) += f_op_sp.o
-aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o
-aufs-$(CONFIG_AUFS_DEBUG) += debug.o
-aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * all header files
- */
-
-#ifndef __AUFS_H__
-#define __AUFS_H__
-
-#ifdef __KERNEL__
-
-#define AuStub(type, name, body, ...) \
- static inline type name(__VA_ARGS__) { body; }
-
-#define AuStubVoid(name, ...) \
- AuStub(void, name, , __VA_ARGS__)
-#define AuStubInt0(name, ...) \
- AuStub(int, name, return 0, __VA_ARGS__)
-
-#include "debug.h"
-
-#include "branch.h"
-#include "cpup.h"
-#include "dcsub.h"
-#include "dbgaufs.h"
-#include "dentry.h"
-#include "dir.h"
-#include "dynop.h"
-#include "file.h"
-#include "fstype.h"
-#include "inode.h"
-#include "loop.h"
-#include "module.h"
-/* never include ./mtx.h */
-#include "opts.h"
-#include "rwsem.h"
-#include "spl.h"
-#include "super.h"
-#include "sysaufs.h"
-#include "vfsub.h"
-#include "whout.h"
-#include "wkq.h"
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * branch management
- */
-
-#include <linux/file.h>
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/*
- * free a single branch
- */
-static void au_br_do_free(struct au_branch *br)
-{
- int i;
- struct au_wbr *wbr;
- struct au_dykey **key;
-
- if (br->br_xino.xi_file)
- fput(br->br_xino.xi_file);
- mutex_destroy(&br->br_xino.xi_nondir_mtx);
-
- AuDebugOn(atomic_read(&br->br_count));
-
- wbr = br->br_wbr;
- if (wbr) {
- for (i = 0; i < AuBrWh_Last; i++)
- dput(wbr->wbr_wh[i]);
- AuDebugOn(atomic_read(&wbr->wbr_wh_running));
- AuRwDestroy(&wbr->wbr_wh_rwsem);
- }
-
- key = br->br_dykey;
- for (i = 0; i < AuBrDynOp; i++, key++)
- if (*key)
- au_dy_put(*key);
- else
- break;
-
- /* some filesystems acquire extra lock */
- /* lockdep_off(); */
- mntput(br->br_mnt);
- /* lockdep_on(); */
-
- kfree(wbr);
- kfree(br);
-}
-
-/*
- * frees all branches
- */
-void au_br_free(struct au_sbinfo *sbinfo)
-{
- aufs_bindex_t bmax;
- struct au_branch **br;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- bmax = sbinfo->si_bend + 1;
- br = sbinfo->si_branch;
- while (bmax--)
- au_br_do_free(*br++);
-}
-
-/*
- * find the index of a branch which is specified by @br_id.
- */
-int au_br_index(struct super_block *sb, aufs_bindex_t br_id)
-{
- aufs_bindex_t bindex, bend;
-
- bend = au_sbend(sb);
- for (bindex = 0; bindex <= bend; bindex++)
- if (au_sbr_id(sb, bindex) == br_id)
- return bindex;
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * add a branch
- */
-
-static int test_overlap(struct super_block *sb, struct dentry *h_d1,
- struct dentry *h_d2)
-{
- if (unlikely(h_d1 == h_d2))
- return 1;
- return au_test_subdir(h_d1, h_d2)
- || au_test_subdir(h_d2, h_d1)
- || au_test_loopback_overlap(sb, h_d1, h_d2)
- || au_test_loopback_overlap(sb, h_d2, h_d1);
-}
-
-/*
- * returns a newly allocated branch. @new_nbranch is a number of branches
- * after adding a branch.
- */
-static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch,
- int perm)
-{
- struct au_branch *add_branch;
- struct dentry *root;
- int err;
-
- err = -ENOMEM;
- root = sb->s_root;
- add_branch = kmalloc(sizeof(*add_branch), GFP_NOFS);
- if (unlikely(!add_branch))
- goto out;
-
- add_branch->br_wbr = NULL;
- if (au_br_writable(perm)) {
- /* may be freed separately at changing the branch permission */
- add_branch->br_wbr = kmalloc(sizeof(*add_branch->br_wbr),
- GFP_NOFS);
- if (unlikely(!add_branch->br_wbr))
- goto out_br;
- }
-
- err = au_sbr_realloc(au_sbi(sb), new_nbranch);
- if (!err)
- err = au_di_realloc(au_di(root), new_nbranch);
- if (!err)
- err = au_ii_realloc(au_ii(root->d_inode), new_nbranch);
- if (!err)
- return add_branch; /* success */
-
- kfree(add_branch->br_wbr);
-
- out_br:
- kfree(add_branch);
- out:
- return ERR_PTR(err);
-}
-
-/*
- * test if the branch permission is legal or not.
- */
-static int test_br(struct inode *inode, int brperm, char *path)
-{
- int err;
-
- err = (au_br_writable(brperm) && IS_RDONLY(inode));
- if (!err)
- goto out;
-
- err = -EINVAL;
- pr_err("write permission for readonly mount or inode, %s\n", path);
-
- out:
- return err;
-}
-
-/*
- * returns:
- * 0: success, the caller will add it
- * plus: success, it is already unified, the caller should ignore it
- * minus: error
- */
-static int test_add(struct super_block *sb, struct au_opt_add *add, int remount)
-{
- int err;
- aufs_bindex_t bend, bindex;
- struct dentry *root;
- struct inode *inode, *h_inode;
-
- root = sb->s_root;
- bend = au_sbend(sb);
- if (unlikely(bend >= 0
- && au_find_dbindex(root, add->path.dentry) >= 0)) {
- err = 1;
- if (!remount) {
- err = -EINVAL;
- pr_err("%s duplicated\n", add->pathname);
- }
- goto out;
- }
-
- err = -ENOSPC; /* -E2BIG; */
- if (unlikely(AUFS_BRANCH_MAX <= add->bindex
- || AUFS_BRANCH_MAX - 1 <= bend)) {
- pr_err("number of branches exceeded %s\n", add->pathname);
- goto out;
- }
-
- err = -EDOM;
- if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) {
- pr_err("bad index %d\n", add->bindex);
- goto out;
- }
-
- inode = add->path.dentry->d_inode;
- err = -ENOENT;
- if (unlikely(!inode->i_nlink)) {
- pr_err("no existence %s\n", add->pathname);
- goto out;
- }
-
- err = -EINVAL;
- if (unlikely(inode->i_sb == sb)) {
- pr_err("%s must be outside\n", add->pathname);
- goto out;
- }
-
- if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) {
- pr_err("unsupported filesystem, %s (%s)\n",
- add->pathname, au_sbtype(inode->i_sb));
- goto out;
- }
-
- err = test_br(add->path.dentry->d_inode, add->perm, add->pathname);
- if (unlikely(err))
- goto out;
-
- if (bend < 0)
- return 0; /* success */
-
- err = -EINVAL;
- for (bindex = 0; bindex <= bend; bindex++)
- if (unlikely(test_overlap(sb, add->path.dentry,
- au_h_dptr(root, bindex)))) {
- pr_err("%s is overlapped\n", add->pathname);
- goto out;
- }
-
- err = 0;
- if (au_opt_test(au_mntflags(sb), WARN_PERM)) {
- h_inode = au_h_dptr(root, 0)->d_inode;
- if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO)
- || h_inode->i_uid != inode->i_uid
- || h_inode->i_gid != inode->i_gid)
- pr_warning("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
- add->pathname,
- inode->i_uid, inode->i_gid,
- (inode->i_mode & S_IALLUGO),
- h_inode->i_uid, h_inode->i_gid,
- (h_inode->i_mode & S_IALLUGO));
- }
-
- out:
- return err;
-}
-
-/*
- * initialize or clean the whiteouts for an adding branch
- */
-static int au_br_init_wh(struct super_block *sb, struct au_branch *br,
- int new_perm, struct dentry *h_root)
-{
- int err, old_perm;
- aufs_bindex_t bindex;
- struct mutex *h_mtx;
- struct au_wbr *wbr;
- struct au_hinode *hdir;
-
- wbr = br->br_wbr;
- old_perm = br->br_perm;
- br->br_perm = new_perm;
- hdir = NULL;
- h_mtx = NULL;
- bindex = au_br_index(sb, br->br_id);
- if (0 <= bindex) {
- hdir = au_hi(sb->s_root->d_inode, bindex);
- au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
- } else {
- h_mtx = &h_root->d_inode->i_mutex;
- mutex_lock_nested(h_mtx, AuLsc_I_PARENT);
- }
- if (!wbr)
- err = au_wh_init(h_root, br, sb);
- else {
- wbr_wh_write_lock(wbr);
- err = au_wh_init(h_root, br, sb);
- wbr_wh_write_unlock(wbr);
- }
- if (hdir)
- au_hn_imtx_unlock(hdir);
- else
- mutex_unlock(h_mtx);
- br->br_perm = old_perm;
-
- if (!err && wbr && !au_br_writable(new_perm)) {
- kfree(wbr);
- br->br_wbr = NULL;
- }
-
- return err;
-}
-
-static int au_wbr_init(struct au_branch *br, struct super_block *sb,
- int perm, struct path *path)
-{
- int err;
- struct kstatfs kst;
- struct au_wbr *wbr;
- struct dentry *h_dentry;
-
- wbr = br->br_wbr;
- au_rw_init(&wbr->wbr_wh_rwsem);
- memset(wbr->wbr_wh, 0, sizeof(wbr->wbr_wh));
- atomic_set(&wbr->wbr_wh_running, 0);
- wbr->wbr_bytes = 0;
-
- /*
- * a limit for rmdir/rename a dir
- * cf. AUFS_MAX_NAMELEN in include/linux/aufs_type.h
- */
- h_dentry = path->dentry;
- err = vfs_statfs(h_dentry, &kst);
- if (unlikely(err))
- goto out;
- err = -EINVAL;
- if (kst.f_namelen >= NAME_MAX)
- err = au_br_init_wh(sb, br, perm, h_dentry);
- else
- pr_err("%.*s(%s), unsupported namelen %ld\n",
- AuDLNPair(h_dentry), au_sbtype(h_dentry->d_sb),
- kst.f_namelen);
-
- out:
- return err;
-}
-
-/* intialize a new branch */
-static int au_br_init(struct au_branch *br, struct super_block *sb,
- struct au_opt_add *add)
-{
- int err;
-
- err = 0;
- memset(&br->br_xino, 0, sizeof(br->br_xino));
- mutex_init(&br->br_xino.xi_nondir_mtx);
- br->br_perm = add->perm;
- br->br_mnt = add->path.mnt; /* set first, mntget() later */
- spin_lock_init(&br->br_dykey_lock);
- memset(br->br_dykey, 0, sizeof(br->br_dykey));
- atomic_set(&br->br_count, 0);
- br->br_xino_upper = AUFS_XINO_TRUNC_INIT;
- atomic_set(&br->br_xino_running, 0);
- br->br_id = au_new_br_id(sb);
-
- if (au_br_writable(add->perm)) {
- err = au_wbr_init(br, sb, add->perm, &add->path);
- if (unlikely(err))
- goto out;
- }
-
- if (au_opt_test(au_mntflags(sb), XINO)) {
- err = au_xino_br(sb, br, add->path.dentry->d_inode->i_ino,
- au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1);
- if (unlikely(err)) {
- AuDebugOn(br->br_xino.xi_file);
- goto out;
- }
- }
-
- sysaufs_br_init(br);
- mntget(add->path.mnt);
-
- out:
- return err;
-}
-
-static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex,
- struct au_branch *br, aufs_bindex_t bend,
- aufs_bindex_t amount)
-{
- struct au_branch **brp;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- brp = sbinfo->si_branch + bindex;
- memmove(brp + 1, brp, sizeof(*brp) * amount);
- *brp = br;
- sbinfo->si_bend++;
- if (unlikely(bend < 0))
- sbinfo->si_bend = 0;
-}
-
-static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex,
- aufs_bindex_t bend, aufs_bindex_t amount)
-{
- struct au_hdentry *hdp;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- hdp = dinfo->di_hdentry + bindex;
- memmove(hdp + 1, hdp, sizeof(*hdp) * amount);
- au_h_dentry_init(hdp);
- dinfo->di_bend++;
- if (unlikely(bend < 0))
- dinfo->di_bstart = 0;
-}
-
-static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex,
- aufs_bindex_t bend, aufs_bindex_t amount)
-{
- struct au_hinode *hip;
-
- AuRwMustWriteLock(&iinfo->ii_rwsem);
-
- hip = iinfo->ii_hinode + bindex;
- memmove(hip + 1, hip, sizeof(*hip) * amount);
- hip->hi_inode = NULL;
- au_hn_init(hip);
- iinfo->ii_bend++;
- if (unlikely(bend < 0))
- iinfo->ii_bstart = 0;
-}
-
-static void au_br_do_add(struct super_block *sb, struct dentry *h_dentry,
- struct au_branch *br, aufs_bindex_t bindex)
-{
- struct dentry *root;
- struct inode *root_inode;
- aufs_bindex_t bend, amount;
-
- root = sb->s_root;
- root_inode = root->d_inode;
- au_plink_maint_block(sb);
- bend = au_sbend(sb);
- amount = bend + 1 - bindex;
- au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount);
- au_br_do_add_hdp(au_di(root), bindex, bend, amount);
- au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount);
- au_set_h_dptr(root, bindex, dget(h_dentry));
- au_set_h_iptr(root_inode, bindex, au_igrab(h_dentry->d_inode),
- /*flags*/0);
-}
-
-int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount)
-{
- int err;
- aufs_bindex_t bend, add_bindex;
- struct dentry *root, *h_dentry;
- struct inode *root_inode;
- struct au_branch *add_branch;
-
- root = sb->s_root;
- root_inode = root->d_inode;
- IMustLock(root_inode);
- err = test_add(sb, add, remount);
- if (unlikely(err < 0))
- goto out;
- if (err) {
- err = 0;
- goto out; /* success */
- }
-
- bend = au_sbend(sb);
- add_branch = au_br_alloc(sb, bend + 2, add->perm);
- err = PTR_ERR(add_branch);
- if (IS_ERR(add_branch))
- goto out;
-
- err = au_br_init(add_branch, sb, add);
- if (unlikely(err)) {
- au_br_do_free(add_branch);
- goto out;
- }
-
- add_bindex = add->bindex;
- h_dentry = add->path.dentry;
- if (!remount)
- au_br_do_add(sb, h_dentry, add_branch, add_bindex);
- else {
- sysaufs_brs_del(sb, add_bindex);
- au_br_do_add(sb, h_dentry, add_branch, add_bindex);
- sysaufs_brs_add(sb, add_bindex);
- }
-
- if (!add_bindex) {
- au_cpup_attr_all(root_inode, /*force*/1);
- sb->s_maxbytes = h_dentry->d_sb->s_maxbytes;
- } else
- au_add_nlink(root_inode, h_dentry->d_inode);
-
- /*
- * this test/set prevents aufs from handling unnecesary notify events
- * of xino files, in a case of re-adding a writable branch which was
- * once detached from aufs.
- */
- if (au_xino_brid(sb) < 0
- && au_br_writable(add_branch->br_perm)
- && !au_test_fs_bad_xino(h_dentry->d_sb)
- && add_branch->br_xino.xi_file
- && add_branch->br_xino.xi_file->f_dentry->d_parent == h_dentry)
- au_xino_brid_set(sb, add_branch->br_id);
-
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * delete a branch
- */
-
-/* to show the line number, do not make it inlined function */
-#define AuVerbose(do_info, fmt, ...) do { \
- if (do_info) \
- pr_info(fmt, ##__VA_ARGS__); \
-} while (0)
-
-/*
- * test if the branch is deletable or not.
- */
-static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex,
- unsigned int sigen)
-{
- int err, i, j, ndentry;
- aufs_bindex_t bstart, bend;
- unsigned char verbose;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry *d;
- struct inode *inode;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_dcsub_pages(&dpages, root, NULL, NULL);
- if (unlikely(err))
- goto out_dpages;
-
- verbose = !!au_opt_test(au_mntflags(root->d_sb), VERBOSE);
- for (i = 0; !err && i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- ndentry = dpage->ndentry;
- for (j = 0; !err && j < ndentry; j++) {
- d = dpage->dentries[j];
- AuDebugOn(!atomic_read(&d->d_count));
- inode = d->d_inode;
- if (au_digen(d) == sigen && au_iigen(inode) == sigen)
- di_read_lock_child(d, AuLock_IR);
- else {
- di_write_lock_child(d);
- err = au_reval_dpath(d, sigen);
- if (!err)
- di_downgrade_lock(d, AuLock_IR);
- else {
- di_write_unlock(d);
- break;
- }
- }
-
- bstart = au_dbstart(d);
- bend = au_dbend(d);
- if (bstart <= bindex
- && bindex <= bend
- && au_h_dptr(d, bindex)
- && (!S_ISDIR(inode->i_mode) || bstart == bend)) {
- err = -EBUSY;
- AuVerbose(verbose, "busy %.*s\n", AuDLNPair(d));
- }
- di_read_unlock(d, AuLock_IR);
- }
- }
-
- out_dpages:
- au_dpages_free(&dpages);
- out:
- return err;
-}
-
-static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex,
- unsigned int sigen)
-{
- int err;
- struct inode *i;
- aufs_bindex_t bstart, bend;
- unsigned char verbose;
-
- err = 0;
- verbose = !!au_opt_test(au_mntflags(sb), VERBOSE);
- list_for_each_entry(i, &sb->s_inodes, i_sb_list) {
- AuDebugOn(!atomic_read(&i->i_count));
- if (!list_empty(&i->i_dentry))
- continue;
-
- if (au_iigen(i) == sigen)
- ii_read_lock_child(i);
- else {
- ii_write_lock_child(i);
- err = au_refresh_hinode_self(i, /*do_attr*/1);
- if (!err)
- ii_downgrade_lock(i);
- else {
- ii_write_unlock(i);
- break;
- }
- }
-
- bstart = au_ibstart(i);
- bend = au_ibend(i);
- if (bstart <= bindex
- && bindex <= bend
- && au_h_iptr(i, bindex)
- && (!S_ISDIR(i->i_mode) || bstart == bend)) {
- err = -EBUSY;
- AuVerbose(verbose, "busy i%lu\n", i->i_ino);
- ii_read_unlock(i);
- break;
- }
- ii_read_unlock(i);
- }
-
- return err;
-}
-
-static int test_children_busy(struct dentry *root, aufs_bindex_t bindex)
-{
- int err;
- unsigned int sigen;
-
- sigen = au_sigen(root->d_sb);
- DiMustNoWaiters(root);
- IiMustNoWaiters(root->d_inode);
- di_write_unlock(root);
- err = test_dentry_busy(root, bindex, sigen);
- if (!err)
- err = test_inode_busy(root->d_sb, bindex, sigen);
- di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
-
- return err;
-}
-
-static void au_br_do_del_brp(struct au_sbinfo *sbinfo,
- const aufs_bindex_t bindex,
- const aufs_bindex_t bend)
-{
- struct au_branch **brp, **p;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- brp = sbinfo->si_branch + bindex;
- if (bindex < bend)
- memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex));
- sbinfo->si_branch[0 + bend] = NULL;
- sbinfo->si_bend--;
-
- p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, GFP_NOFS);
- if (p)
- sbinfo->si_branch = p;
- /* harmless error */
-}
-
-static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex,
- const aufs_bindex_t bend)
-{
- struct au_hdentry *hdp, *p;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- hdp = dinfo->di_hdentry;
- if (bindex < bend)
- memmove(hdp + bindex, hdp + bindex + 1,
- sizeof(*hdp) * (bend - bindex));
- hdp[0 + bend].hd_dentry = NULL;
- dinfo->di_bend--;
-
- p = krealloc(hdp, sizeof(*p) * bend, GFP_NOFS);
- if (p)
- dinfo->di_hdentry = p;
- /* harmless error */
-}
-
-static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex,
- const aufs_bindex_t bend)
-{
- struct au_hinode *hip, *p;
-
- AuRwMustWriteLock(&iinfo->ii_rwsem);
-
- hip = iinfo->ii_hinode + bindex;
- if (bindex < bend)
- memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex));
- iinfo->ii_hinode[0 + bend].hi_inode = NULL;
- au_hn_init(iinfo->ii_hinode + bend);
- iinfo->ii_bend--;
-
- p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, GFP_NOFS);
- if (p)
- iinfo->ii_hinode = p;
- /* harmless error */
-}
-
-static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
- struct au_branch *br)
-{
- aufs_bindex_t bend;
- struct au_sbinfo *sbinfo;
- struct dentry *root;
- struct inode *inode;
-
- SiMustWriteLock(sb);
-
- root = sb->s_root;
- inode = root->d_inode;
- au_plink_maint_block(sb);
- sbinfo = au_sbi(sb);
- bend = sbinfo->si_bend;
-
- dput(au_h_dptr(root, bindex));
- au_hiput(au_hi(inode, bindex));
- au_br_do_free(br);
-
- au_br_do_del_brp(sbinfo, bindex, bend);
- au_br_do_del_hdp(au_di(root), bindex, bend);
- au_br_do_del_hip(au_ii(inode), bindex, bend);
-}
-
-int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount)
-{
- int err, rerr, i;
- unsigned int mnt_flags;
- aufs_bindex_t bindex, bend, br_id;
- unsigned char do_wh, verbose;
- struct au_branch *br;
- struct au_wbr *wbr;
-
- err = 0;
- bindex = au_find_dbindex(sb->s_root, del->h_path.dentry);
- if (bindex < 0) {
- if (remount)
- goto out; /* success */
- err = -ENOENT;
- pr_err("%s no such branch\n", del->pathname);
- goto out;
- }
- AuDbg("bindex b%d\n", bindex);
-
- err = -EBUSY;
- mnt_flags = au_mntflags(sb);
- verbose = !!au_opt_test(mnt_flags, VERBOSE);
- bend = au_sbend(sb);
- if (unlikely(!bend)) {
- AuVerbose(verbose, "no more branches left\n");
- goto out;
- }
- br = au_sbr(sb, bindex);
- i = atomic_read(&br->br_count);
- if (unlikely(i)) {
- AuVerbose(verbose, "%d file(s) opened\n", i);
- goto out;
- }
-
- wbr = br->br_wbr;
- do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph);
- if (do_wh) {
- /* instead of WbrWhMustWriteLock(wbr) */
- SiMustWriteLock(sb);
- for (i = 0; i < AuBrWh_Last; i++) {
- dput(wbr->wbr_wh[i]);
- wbr->wbr_wh[i] = NULL;
- }
- }
-
- err = test_children_busy(sb->s_root, bindex);
- if (unlikely(err)) {
- if (do_wh)
- goto out_wh;
- goto out;
- }
-
- err = 0;
- br_id = br->br_id;
- if (!remount)
- au_br_do_del(sb, bindex, br);
- else {
- sysaufs_brs_del(sb, bindex);
- au_br_do_del(sb, bindex, br);
- sysaufs_brs_add(sb, bindex);
- }
-
- if (!bindex) {
- au_cpup_attr_all(sb->s_root->d_inode, /*force*/1);
- sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes;
- } else
- au_sub_nlink(sb->s_root->d_inode, del->h_path.dentry->d_inode);
- if (au_opt_test(mnt_flags, PLINK))
- au_plink_half_refresh(sb, br_id);
-
- if (au_xino_brid(sb) == br->br_id)
- au_xino_brid_set(sb, -1);
- goto out; /* success */
-
- out_wh:
- /* revert */
- rerr = au_br_init_wh(sb, br, br->br_perm, del->h_path.dentry);
- if (rerr)
- pr_warning("failed re-creating base whiteout, %s. (%d)\n",
- del->pathname, rerr);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * change a branch permission
- */
-
-static void au_warn_ima(void)
-{
-#ifdef CONFIG_IMA
- /* since it doesn't support mark_files_ro() */
- pr_warning("RW -> RO makes IMA to produce wrong message");
-#endif
-}
-
-static int do_need_sigen_inc(int a, int b)
-{
- return au_br_whable(a) && !au_br_whable(b);
-}
-
-static int need_sigen_inc(int old, int new)
-{
- return do_need_sigen_inc(old, new)
- || do_need_sigen_inc(new, old);
-}
-
-static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err;
- unsigned long n, ul, bytes, files;
- aufs_bindex_t bstart;
- struct file *file, *hf, **a;
- const int step_bytes = 1024, /* memory allocation unit */
- step_files = step_bytes / sizeof(*a);
-
- err = -ENOMEM;
- n = 0;
- bytes = step_bytes;
- files = step_files;
- a = kmalloc(bytes, GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- /* no need file_list_lock() since sbinfo is locked? defered? */
- list_for_each_entry(file, &sb->s_files, f_u.fu_list) {
- if (special_file(file->f_dentry->d_inode->i_mode))
- continue;
-
- AuDbg("%.*s\n", AuDLNPair(file->f_dentry));
- fi_read_lock(file);
- if (unlikely(au_test_mmapped(file))) {
- err = -EBUSY;
- FiMustNoWaiters(file);
- fi_read_unlock(file);
- goto out_free;
- }
-
- bstart = au_fbstart(file);
- if (!S_ISREG(file->f_dentry->d_inode->i_mode)
- || !(file->f_mode & FMODE_WRITE)
- || bstart != bindex) {
- FiMustNoWaiters(file);
- fi_read_unlock(file);
- continue;
- }
-
- hf = au_hf_top(file);
- FiMustNoWaiters(file);
- fi_read_unlock(file);
-
- if (n < files)
- a[n++] = hf;
- else {
- void *p;
-
- err = -ENOMEM;
- bytes += step_bytes;
- files += step_files;
- p = krealloc(a, bytes, GFP_NOFS);
- if (p) {
- a = p;
- a[n++] = hf;
- } else
- goto out_free;
- }
- }
-
- err = 0;
- if (n)
- au_warn_ima();
- for (ul = 0; ul < n; ul++) {
- /* todo: already flushed? */
- /* cf. fs/super.c:mark_files_ro() */
- hf = a[ul];
- hf->f_mode &= ~FMODE_WRITE;
- if (!file_check_writeable(hf)) {
- file_release_write(hf);
- mnt_drop_write(hf->f_vfsmnt);
- }
- }
-
- out_free:
- kfree(a);
- out:
- return err;
-}
-
-int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
- int *do_update)
-{
- int err, rerr;
- aufs_bindex_t bindex;
- struct path path;
- struct dentry *root;
- struct au_branch *br;
-
- root = sb->s_root;
- au_plink_maint_block(sb);
- bindex = au_find_dbindex(root, mod->h_root);
- if (bindex < 0) {
- if (remount)
- return 0; /* success */
- err = -ENOENT;
- pr_err("%s no such branch\n", mod->path);
- goto out;
- }
- AuDbg("bindex b%d\n", bindex);
-
- err = test_br(mod->h_root->d_inode, mod->perm, mod->path);
- if (unlikely(err))
- goto out;
-
- br = au_sbr(sb, bindex);
- if (br->br_perm == mod->perm)
- return 0; /* success */
-
- if (au_br_writable(br->br_perm)) {
- /* remove whiteout base */
- err = au_br_init_wh(sb, br, mod->perm, mod->h_root);
- if (unlikely(err))
- goto out;
-
- if (!au_br_writable(mod->perm)) {
- /* rw --> ro, file might be mmapped */
- DiMustNoWaiters(root);
- IiMustNoWaiters(root->d_inode);
- di_write_unlock(root);
- err = au_br_mod_files_ro(sb, bindex);
- /* aufs_write_lock() calls ..._child() */
- di_write_lock_child(root);
-
- if (unlikely(err)) {
- rerr = -ENOMEM;
- br->br_wbr = kmalloc(sizeof(*br->br_wbr),
- GFP_NOFS);
- if (br->br_wbr) {
- path.mnt = br->br_mnt;
- path.dentry = mod->h_root;
- rerr = au_wbr_init(br, sb, br->br_perm,
- &path);
- }
- if (unlikely(rerr)) {
- AuIOErr("nested error %d (%d)\n",
- rerr, err);
- br->br_perm = mod->perm;
- }
- }
- }
- } else if (au_br_writable(mod->perm)) {
- /* ro --> rw */
- err = -ENOMEM;
- br->br_wbr = kmalloc(sizeof(*br->br_wbr), GFP_NOFS);
- if (br->br_wbr) {
- path.mnt = br->br_mnt;
- path.dentry = mod->h_root;
- err = au_wbr_init(br, sb, mod->perm, &path);
- if (unlikely(err)) {
- kfree(br->br_wbr);
- br->br_wbr = NULL;
- }
- }
- }
-
- if (!err) {
- *do_update |= need_sigen_inc(br->br_perm, mod->perm);
- br->br_perm = mod->perm;
- }
-
- out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * branch filesystems and xino for them
- */
-
-#ifndef __AUFS_BRANCH_H__
-#define __AUFS_BRANCH_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/aufs_type.h>
-#include "dynop.h"
-#include "rwsem.h"
-#include "super.h"
-
-/* ---------------------------------------------------------------------- */
-
-/* a xino file */
-struct au_xino_file {
- struct file *xi_file;
- struct mutex xi_nondir_mtx;
-
- /* todo: make xino files an array to support huge inode number */
-
-#ifdef CONFIG_DEBUG_FS
- struct dentry *xi_dbgaufs;
-#endif
-};
-
-/* members for writable branch only */
-enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last};
-struct au_wbr {
- struct au_rwsem wbr_wh_rwsem;
- struct dentry *wbr_wh[AuBrWh_Last];
- atomic_t wbr_wh_running;
-#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */
-#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */
-#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */
-
- /* mfs mode */
- unsigned long long wbr_bytes;
-};
-
-/* ext2 has 3 types of operations at least, ext3 has 4 */
-#define AuBrDynOp (AuDyLast * 4)
-
-/* protected by superblock rwsem */
-struct au_branch {
- struct au_xino_file br_xino;
-
- aufs_bindex_t br_id;
-
- int br_perm;
- struct vfsmount *br_mnt;
- spinlock_t br_dykey_lock;
- struct au_dykey *br_dykey[AuBrDynOp];
- atomic_t br_count;
-
- struct au_wbr *br_wbr;
-
- /* xino truncation */
- blkcnt_t br_xino_upper; /* watermark in blocks */
- atomic_t br_xino_running;
-
-#ifdef CONFIG_SYSFS
- /* an entry under sysfs per mount-point */
- char br_name[8];
- struct attribute br_attr;
-#endif
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* branch permission and attribute */
-enum {
- AuBrPerm_RW, /* writable, linkable wh */
- AuBrPerm_RO, /* readonly, no wh */
- AuBrPerm_RR, /* natively readonly, no wh */
-
- AuBrPerm_RWNoLinkWH, /* un-linkable whiteouts */
-
- AuBrPerm_ROWH, /* whiteout-able */
- AuBrPerm_RRWH, /* whiteout-able */
-
- AuBrPerm_Last
-};
-
-static inline int au_br_writable(int brperm)
-{
- return brperm == AuBrPerm_RW || brperm == AuBrPerm_RWNoLinkWH;
-}
-
-static inline int au_br_whable(int brperm)
-{
- return brperm == AuBrPerm_RW
- || brperm == AuBrPerm_ROWH
- || brperm == AuBrPerm_RRWH;
-}
-
-static inline int au_br_rdonly(struct au_branch *br)
-{
- return ((br->br_mnt->mnt_sb->s_flags & MS_RDONLY)
- || !au_br_writable(br->br_perm))
- ? -EROFS : 0;
-}
-
-static inline int au_br_hnotifyable(int brperm __maybe_unused)
-{
-#ifdef CONFIG_AUFS_HNOTIFY
- return brperm != AuBrPerm_RR && brperm != AuBrPerm_RRWH;
-#else
- return 0;
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* branch.c */
-struct au_sbinfo;
-void au_br_free(struct au_sbinfo *sinfo);
-int au_br_index(struct super_block *sb, aufs_bindex_t br_id);
-struct au_opt_add;
-int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount);
-struct au_opt_del;
-int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount);
-struct au_opt_mod;
-int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
- int *do_update);
-
-/* xino.c */
-static const loff_t au_loff_max = LLONG_MAX;
-
-int au_xib_trunc(struct super_block *sb);
-ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size,
- loff_t *pos);
-ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size,
- loff_t *pos);
-struct file *au_xino_create2(struct file *base_file, struct file *copy_src);
-struct file *au_xino_create(struct super_block *sb, char *fname, int silent);
-ino_t au_xino_new_ino(struct super_block *sb);
-int au_xino_write0(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t ino);
-int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t ino);
-int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t *ino);
-int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino,
- struct file *base_file, int do_test);
-int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex);
-
-struct au_opt_xino;
-int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount);
-void au_xino_clr(struct super_block *sb);
-struct file *au_xino_def(struct super_block *sb);
-int au_xino_path(struct seq_file *seq, struct file *file);
-
-/* ---------------------------------------------------------------------- */
-
-/* Superblock to branch */
-static inline
-aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_sbr(sb, bindex)->br_id;
-}
-
-static inline
-struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_sbr(sb, bindex)->br_mnt;
-}
-
-static inline
-struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_sbr_mnt(sb, bindex)->mnt_sb;
-}
-
-static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex)
-{
- atomic_dec_return(&au_sbr(sb, bindex)->br_count);
-}
-
-static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_sbr(sb, bindex)->br_perm;
-}
-
-static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_br_whable(au_sbr_perm(sb, bindex));
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * wbr_wh_read_lock, wbr_wh_write_lock
- * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock
- */
-AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem);
-
-#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&wbr->wbr_wh_rwsem)
-#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&wbr->wbr_wh_rwsem)
-#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&wbr->wbr_wh_rwsem)
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_BRANCH_H__ */
+++ /dev/null
-
-AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS}
-
-define AuConf
-ifdef ${1}
-AuConfStr += ${1}=${${1}}
-endif
-endef
-
-$(foreach i, BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \
- HNOTIFY HFSNOTIFY HINOTIFY \
- EXPORT INO_T_64 \
- RDU \
- SP_IATTR \
- SHWH \
- BR_RAMFS \
- BR_FUSE POLL \
- BR_HFSPLUS \
- BDEV_LOOP \
- DEBUG MAGIC_SYSRQ, \
- $(eval $(call AuConf,CONFIG_AUFS_${i})))
-
-AuConfName = ${obj}/conf.str
-${AuConfName}.tmp: FORCE
- @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@
-${AuConfName}: ${AuConfName}.tmp
- @diff -q $< $@ > /dev/null 2>&1 || { \
- echo ' GEN ' $@; \
- cp -p $< $@; \
- }
-FORCE:
-clean-files += ${AuConfName} ${AuConfName}.tmp
-${obj}/sysfs.o: ${AuConfName}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * copy-up functions, see wbr_policy.c for copy-down
- */
-
-#include <linux/file.h>
-#include <linux/fs_stack.h>
-#include <linux/mm.h>
-#include <linux/uaccess.h>
-#include "aufs.h"
-
-void au_cpup_attr_flags(struct inode *dst, struct inode *src)
-{
- const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE
- | S_NOATIME | S_NOCMTIME;
-
- dst->i_flags |= src->i_flags & ~mask;
- if (au_test_fs_notime(dst->i_sb))
- dst->i_flags |= S_NOATIME | S_NOCMTIME;
-}
-
-void au_cpup_attr_timesizes(struct inode *inode)
-{
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, au_ibstart(inode));
- fsstack_copy_attr_times(inode, h_inode);
- fsstack_copy_inode_size(inode, h_inode);
-}
-
-void au_cpup_attr_nlink(struct inode *inode, int force)
-{
- struct inode *h_inode;
- struct super_block *sb;
- aufs_bindex_t bindex, bend;
-
- sb = inode->i_sb;
- bindex = au_ibstart(inode);
- h_inode = au_h_iptr(inode, bindex);
- if (!force
- && !S_ISDIR(h_inode->i_mode)
- && au_opt_test(au_mntflags(sb), PLINK)
- && au_plink_test(inode))
- return;
-
- inode->i_nlink = h_inode->i_nlink;
-
- /*
- * fewer nlink makes find(1) noisy, but larger nlink doesn't.
- * it may includes whplink directory.
- */
- if (S_ISDIR(h_inode->i_mode)) {
- bend = au_ibend(inode);
- for (bindex++; bindex <= bend; bindex++) {
- h_inode = au_h_iptr(inode, bindex);
- if (h_inode)
- au_add_nlink(inode, h_inode);
- }
- }
-}
-
-void au_cpup_attr_changeable(struct inode *inode)
-{
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, au_ibstart(inode));
- inode->i_mode = h_inode->i_mode;
- inode->i_uid = h_inode->i_uid;
- inode->i_gid = h_inode->i_gid;
- au_cpup_attr_timesizes(inode);
- au_cpup_attr_flags(inode, h_inode);
-}
-
-void au_cpup_igen(struct inode *inode, struct inode *h_inode)
-{
- struct au_iinfo *iinfo = au_ii(inode);
-
- IiMustWriteLock(inode);
-
- iinfo->ii_higen = h_inode->i_generation;
- iinfo->ii_hsb1 = h_inode->i_sb;
-}
-
-void au_cpup_attr_all(struct inode *inode, int force)
-{
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, au_ibstart(inode));
- au_cpup_attr_changeable(inode);
- if (inode->i_nlink > 0)
- au_cpup_attr_nlink(inode, force);
- inode->i_rdev = h_inode->i_rdev;
- inode->i_blkbits = h_inode->i_blkbits;
- au_cpup_igen(inode, h_inode);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */
-
-/* keep the timestamps of the parent dir when cpup */
-void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
- struct path *h_path)
-{
- struct inode *h_inode;
-
- dt->dt_dentry = dentry;
- dt->dt_h_path = *h_path;
- h_inode = h_path->dentry->d_inode;
- dt->dt_atime = h_inode->i_atime;
- dt->dt_mtime = h_inode->i_mtime;
- /* smp_mb(); */
-}
-
-void au_dtime_revert(struct au_dtime *dt)
-{
- struct iattr attr;
- int err;
-
- attr.ia_atime = dt->dt_atime;
- attr.ia_mtime = dt->dt_mtime;
- attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
- | ATTR_ATIME | ATTR_ATIME_SET;
-
- err = vfsub_notify_change(&dt->dt_h_path, &attr);
- if (unlikely(err))
- pr_warning("restoring timestamps failed(%d). ignored\n", err);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static noinline_for_stack
-int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src)
-{
- int err, sbits;
- struct iattr ia;
- struct path h_path;
- struct inode *h_isrc, *h_idst;
-
- h_path.dentry = au_h_dptr(dst, bindex);
- h_idst = h_path.dentry->d_inode;
- h_path.mnt = au_sbr_mnt(dst->d_sb, bindex);
- h_isrc = h_src->d_inode;
- ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID
- | ATTR_ATIME | ATTR_MTIME
- | ATTR_ATIME_SET | ATTR_MTIME_SET;
- ia.ia_uid = h_isrc->i_uid;
- ia.ia_gid = h_isrc->i_gid;
- ia.ia_atime = h_isrc->i_atime;
- ia.ia_mtime = h_isrc->i_mtime;
- if (h_idst->i_mode != h_isrc->i_mode
- && !S_ISLNK(h_idst->i_mode)) {
- ia.ia_valid |= ATTR_MODE;
- ia.ia_mode = h_isrc->i_mode;
- }
- sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID));
- au_cpup_attr_flags(h_idst, h_isrc);
- err = vfsub_notify_change(&h_path, &ia);
-
- /* is this nfs only? */
- if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) {
- ia.ia_valid = ATTR_FORCE | ATTR_MODE;
- ia.ia_mode = h_isrc->i_mode;
- err = vfsub_notify_change(&h_path, &ia);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_copy_file(struct file *dst, struct file *src, loff_t len,
- char *buf, unsigned long blksize)
-{
- int err;
- size_t sz, rbytes, wbytes;
- unsigned char all_zero;
- char *p, *zp;
- struct mutex *h_mtx;
- /* reduce stack usage */
- struct iattr *ia;
-
- zp = page_address(ZERO_PAGE(0));
- if (unlikely(!zp))
- return -ENOMEM; /* possible? */
-
- err = 0;
- all_zero = 0;
- while (len) {
- AuDbg("len %lld\n", len);
- sz = blksize;
- if (len < blksize)
- sz = len;
-
- rbytes = 0;
- /* todo: signal_pending? */
- while (!rbytes || err == -EAGAIN || err == -EINTR) {
- rbytes = vfsub_read_k(src, buf, sz, &src->f_pos);
- err = rbytes;
- }
- if (unlikely(err < 0))
- break;
-
- all_zero = 0;
- if (len >= rbytes && rbytes == blksize)
- all_zero = !memcmp(buf, zp, rbytes);
- if (!all_zero) {
- wbytes = rbytes;
- p = buf;
- while (wbytes) {
- size_t b;
-
- b = vfsub_write_k(dst, p, wbytes, &dst->f_pos);
- err = b;
- /* todo: signal_pending? */
- if (unlikely(err == -EAGAIN || err == -EINTR))
- continue;
- if (unlikely(err < 0))
- break;
- wbytes -= b;
- p += b;
- }
- } else {
- loff_t res;
-
- AuLabel(hole);
- res = vfsub_llseek(dst, rbytes, SEEK_CUR);
- err = res;
- if (unlikely(res < 0))
- break;
- }
- len -= rbytes;
- err = 0;
- }
-
- /* the last block may be a hole */
- if (!err && all_zero) {
- AuLabel(last hole);
-
- err = 1;
- if (au_test_nfs(dst->f_dentry->d_sb)) {
- /* nfs requires this step to make last hole */
- /* is this only nfs? */
- do {
- /* todo: signal_pending? */
- err = vfsub_write_k(dst, "\0", 1, &dst->f_pos);
- } while (err == -EAGAIN || err == -EINTR);
- if (err == 1)
- dst->f_pos--;
- }
-
- if (err == 1) {
- ia = (void *)buf;
- ia->ia_size = dst->f_pos;
- ia->ia_valid = ATTR_SIZE | ATTR_FILE;
- ia->ia_file = dst;
- h_mtx = &dst->f_dentry->d_inode->i_mutex;
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD2);
- err = vfsub_notify_change(&dst->f_path, ia);
- mutex_unlock(h_mtx);
- }
- }
-
- return err;
-}
-
-int au_copy_file(struct file *dst, struct file *src, loff_t len)
-{
- int err;
- unsigned long blksize;
- unsigned char do_kfree;
- char *buf;
-
- err = -ENOMEM;
- blksize = dst->f_dentry->d_sb->s_blocksize;
- if (!blksize || PAGE_SIZE < blksize)
- blksize = PAGE_SIZE;
- AuDbg("blksize %lu\n", blksize);
- do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *));
- if (do_kfree)
- buf = kmalloc(blksize, GFP_NOFS);
- else
- buf = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!buf))
- goto out;
-
- if (len > (1 << 22))
- AuDbg("copying a large file %lld\n", (long long)len);
-
- src->f_pos = 0;
- dst->f_pos = 0;
- err = au_do_copy_file(dst, src, len, buf, blksize);
- if (do_kfree)
- kfree(buf);
- else
- free_page((unsigned long)buf);
-
- out:
- return err;
-}
-
-/*
- * to support a sparse file which is opened with O_APPEND,
- * we need to close the file.
- */
-static int au_cp_regular(struct dentry *dentry, aufs_bindex_t bdst,
- aufs_bindex_t bsrc, loff_t len)
-{
- int err, i;
- enum { SRC, DST };
- struct {
- aufs_bindex_t bindex;
- unsigned int flags;
- struct dentry *dentry;
- struct file *file;
- void *label, *label_file;
- } *f, file[] = {
- {
- .bindex = bsrc,
- .flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
- .file = NULL,
- .label = &&out,
- .label_file = &&out_src
- },
- {
- .bindex = bdst,
- .flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
- .file = NULL,
- .label = &&out_src,
- .label_file = &&out_dst
- }
- };
- struct super_block *sb;
-
- /* bsrc branch can be ro/rw. */
- sb = dentry->d_sb;
- f = file;
- for (i = 0; i < 2; i++, f++) {
- f->dentry = au_h_dptr(dentry, f->bindex);
- f->file = au_h_open(dentry, f->bindex, f->flags, /*file*/NULL);
- err = PTR_ERR(f->file);
- if (IS_ERR(f->file))
- goto *f->label;
- err = -EINVAL;
- if (unlikely(!f->file->f_op))
- goto *f->label_file;
- }
-
- /* try stopping to update while we copyup */
- IMustLock(file[SRC].dentry->d_inode);
- err = au_copy_file(file[DST].file, file[SRC].file, len);
-
- out_dst:
- fput(file[DST].file);
- au_sbr_put(sb, file[DST].bindex);
- out_src:
- fput(file[SRC].file);
- au_sbr_put(sb, file[SRC].bindex);
- out:
- return err;
-}
-
-static int au_do_cpup_regular(struct dentry *dentry, aufs_bindex_t bdst,
- aufs_bindex_t bsrc, loff_t len,
- struct inode *h_dir, struct path *h_path)
-{
- int err, rerr;
- loff_t l;
-
- err = 0;
- l = i_size_read(au_h_iptr(dentry->d_inode, bsrc));
- if (len == -1 || l < len)
- len = l;
- if (len)
- err = au_cp_regular(dentry, bdst, bsrc, len);
- if (!err)
- goto out; /* success */
-
- rerr = vfsub_unlink(h_dir, h_path, /*force*/0);
- if (rerr) {
- AuIOErr("failed unlinking cpup-ed %.*s(%d, %d)\n",
- AuDLNPair(h_path->dentry), err, rerr);
- err = -EIO;
- }
-
- out:
- return err;
-}
-
-static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src,
- struct inode *h_dir)
-{
- int err, symlen;
- mm_segment_t old_fs;
- char *sym;
-
- err = -ENOSYS;
- if (unlikely(!h_src->d_inode->i_op->readlink))
- goto out;
-
- err = -ENOMEM;
- sym = __getname_gfp(GFP_NOFS);
- if (unlikely(!sym))
- goto out;
-
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- symlen = h_src->d_inode->i_op->readlink(h_src, (char __user *)sym,
- PATH_MAX);
- err = symlen;
- set_fs(old_fs);
-
- if (symlen > 0) {
- sym[symlen] = 0;
- err = vfsub_symlink(h_dir, h_path, sym);
- }
- __putname(sym);
-
- out:
- return err;
-}
-
-/* return with the lower dst inode is locked */
-static noinline_for_stack
-int cpup_entry(struct dentry *dentry, aufs_bindex_t bdst,
- aufs_bindex_t bsrc, loff_t len, unsigned int flags,
- struct dentry *dst_parent)
-{
- int err;
- umode_t mode;
- unsigned int mnt_flags;
- unsigned char isdir;
- const unsigned char do_dt = !!au_ftest_cpup(flags, DTIME);
- struct au_dtime dt;
- struct path h_path;
- struct dentry *h_src, *h_dst, *h_parent;
- struct inode *h_inode, *h_dir;
- struct super_block *sb;
-
- /* bsrc branch can be ro/rw. */
- h_src = au_h_dptr(dentry, bsrc);
- h_inode = h_src->d_inode;
- AuDebugOn(h_inode != au_h_iptr(dentry->d_inode, bsrc));
-
- /* try stopping to be referenced while we are creating */
- h_dst = au_h_dptr(dentry, bdst);
- h_parent = h_dst->d_parent; /* dir inode is locked */
- h_dir = h_parent->d_inode;
- IMustLock(h_dir);
- AuDebugOn(h_parent != h_dst->d_parent);
-
- sb = dentry->d_sb;
- h_path.mnt = au_sbr_mnt(sb, bdst);
- if (do_dt) {
- h_path.dentry = h_parent;
- au_dtime_store(&dt, dst_parent, &h_path);
- }
- h_path.dentry = h_dst;
-
- isdir = 0;
- mode = h_inode->i_mode;
- switch (mode & S_IFMT) {
- case S_IFREG:
- /* try stopping to update while we are referencing */
- IMustLock(h_inode);
- err = vfsub_create(h_dir, &h_path, mode | S_IWUSR);
- if (!err)
- err = au_do_cpup_regular
- (dentry, bdst, bsrc, len,
- au_h_iptr(dst_parent->d_inode, bdst), &h_path);
- break;
- case S_IFDIR:
- isdir = 1;
- err = vfsub_mkdir(h_dir, &h_path, mode);
- if (!err) {
- /*
- * strange behaviour from the users view,
- * particularry setattr case
- */
- if (au_ibstart(dst_parent->d_inode) == bdst)
- au_cpup_attr_nlink(dst_parent->d_inode,
- /*force*/1);
- au_cpup_attr_nlink(dentry->d_inode, /*force*/1);
- }
- break;
- case S_IFLNK:
- err = au_do_cpup_symlink(&h_path, h_src, h_dir);
- break;
- case S_IFCHR:
- case S_IFBLK:
- AuDebugOn(!capable(CAP_MKNOD));
- /*FALLTHROUGH*/
- case S_IFIFO:
- case S_IFSOCK:
- err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev);
- break;
- default:
- AuIOErr("Unknown inode type 0%o\n", mode);
- err = -EIO;
- }
-
- mnt_flags = au_mntflags(sb);
- if (!au_opt_test(mnt_flags, UDBA_NONE)
- && !isdir
- && au_opt_test(mnt_flags, XINO)
- && h_inode->i_nlink == 1
- /* todo: unnecessary? */
- /* && dentry->d_inode->i_nlink == 1 */
- && bdst < bsrc
- && !au_ftest_cpup(flags, KEEPLINO))
- au_xino_write(sb, bsrc, h_inode->i_ino, /*ino*/0);
- /* ignore this error */
-
- if (do_dt)
- au_dtime_revert(&dt);
- return err;
-}
-
-/*
- * copyup the @dentry from @bsrc to @bdst.
- * the caller must set the both of lower dentries.
- * @len is for truncating when it is -1 copyup the entire file.
- * in link/rename cases, @dst_parent may be different from the real one.
- */
-static int au_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
- aufs_bindex_t bsrc, loff_t len, unsigned int flags,
- struct dentry *dst_parent)
-{
- int err, rerr;
- aufs_bindex_t old_ibstart;
- unsigned char isdir, plink;
- struct au_dtime dt;
- struct path h_path;
- struct dentry *h_src, *h_dst, *h_parent;
- struct inode *dst_inode, *h_dir, *inode;
- struct super_block *sb;
-
- AuDebugOn(bsrc <= bdst);
-
- sb = dentry->d_sb;
- h_path.mnt = au_sbr_mnt(sb, bdst);
- h_dst = au_h_dptr(dentry, bdst);
- h_parent = h_dst->d_parent; /* dir inode is locked */
- h_dir = h_parent->d_inode;
- IMustLock(h_dir);
-
- h_src = au_h_dptr(dentry, bsrc);
- inode = dentry->d_inode;
-
- if (!dst_parent)
- dst_parent = dget_parent(dentry);
- else
- dget(dst_parent);
-
- plink = !!au_opt_test(au_mntflags(sb), PLINK);
- dst_inode = au_h_iptr(inode, bdst);
- if (dst_inode) {
- if (unlikely(!plink)) {
- err = -EIO;
- AuIOErr("i%lu exists on a upper branch "
- "but plink is disabled\n", inode->i_ino);
- goto out;
- }
-
- if (dst_inode->i_nlink) {
- const int do_dt = au_ftest_cpup(flags, DTIME);
-
- h_src = au_plink_lkup(inode, bdst);
- err = PTR_ERR(h_src);
- if (IS_ERR(h_src))
- goto out;
- if (unlikely(!h_src->d_inode)) {
- err = -EIO;
- AuIOErr("i%lu exists on a upper branch "
- "but plink is broken\n", inode->i_ino);
- dput(h_src);
- goto out;
- }
-
- if (do_dt) {
- h_path.dentry = h_parent;
- au_dtime_store(&dt, dst_parent, &h_path);
- }
- h_path.dentry = h_dst;
- err = vfsub_link(h_src, h_dir, &h_path);
- if (do_dt)
- au_dtime_revert(&dt);
- dput(h_src);
- goto out;
- } else
- /* todo: cpup_wh_file? */
- /* udba work */
- au_update_ibrange(inode, /*do_put_zero*/1);
- }
-
- old_ibstart = au_ibstart(inode);
- err = cpup_entry(dentry, bdst, bsrc, len, flags, dst_parent);
- if (unlikely(err))
- goto out;
- dst_inode = h_dst->d_inode;
- mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2);
-
- err = cpup_iattr(dentry, bdst, h_src);
- isdir = S_ISDIR(dst_inode->i_mode);
- if (!err) {
- if (bdst < old_ibstart) {
- if (S_ISREG(inode->i_mode)) {
- err = au_dy_iaop(inode, bdst, dst_inode);
- if (unlikely(err))
- goto out_rev;
- }
- au_set_ibstart(inode, bdst);
- }
- au_set_h_iptr(inode, bdst, au_igrab(dst_inode),
- au_hi_flags(inode, isdir));
- mutex_unlock(&dst_inode->i_mutex);
- if (!isdir
- && h_src->d_inode->i_nlink > 1
- && plink)
- au_plink_append(inode, bdst, h_dst);
- goto out; /* success */
- }
-
- /* revert */
-out_rev:
- h_path.dentry = h_parent;
- mutex_unlock(&dst_inode->i_mutex);
- au_dtime_store(&dt, dst_parent, &h_path);
- h_path.dentry = h_dst;
- if (!isdir)
- rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
- else
- rerr = vfsub_rmdir(h_dir, &h_path);
- au_dtime_revert(&dt);
- if (rerr) {
- AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr);
- err = -EIO;
- }
-
- out:
- dput(dst_parent);
- return err;
-}
-
-struct au_cpup_single_args {
- int *errp;
- struct dentry *dentry;
- aufs_bindex_t bdst, bsrc;
- loff_t len;
- unsigned int flags;
- struct dentry *dst_parent;
-};
-
-static void au_call_cpup_single(void *args)
-{
- struct au_cpup_single_args *a = args;
- *a->errp = au_cpup_single(a->dentry, a->bdst, a->bsrc, a->len,
- a->flags, a->dst_parent);
-}
-
-int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
- aufs_bindex_t bsrc, loff_t len, unsigned int flags,
- struct dentry *dst_parent)
-{
- int err, wkq_err;
- umode_t mode;
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bsrc);
- mode = h_dentry->d_inode->i_mode & S_IFMT;
- if ((mode != S_IFCHR && mode != S_IFBLK)
- || capable(CAP_MKNOD))
- err = au_cpup_single(dentry, bdst, bsrc, len, flags,
- dst_parent);
- else {
- struct au_cpup_single_args args = {
- .errp = &err,
- .dentry = dentry,
- .bdst = bdst,
- .bsrc = bsrc,
- .len = len,
- .flags = flags,
- .dst_parent = dst_parent
- };
- wkq_err = au_wkq_wait(au_call_cpup_single, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
-
-/*
- * copyup the @dentry from the first active lower branch to @bdst,
- * using au_cpup_single().
- */
-static int au_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
- unsigned int flags)
-{
- int err;
- aufs_bindex_t bsrc, bend;
-
- bend = au_dbend(dentry);
- for (bsrc = bdst + 1; bsrc <= bend; bsrc++)
- if (au_h_dptr(dentry, bsrc))
- break;
-
- err = au_lkup_neg(dentry, bdst);
- if (!err) {
- err = au_cpup_single(dentry, bdst, bsrc, len, flags, NULL);
- if (!err)
- return 0; /* success */
-
- /* revert */
- au_set_h_dptr(dentry, bdst, NULL);
- au_set_dbstart(dentry, bsrc);
- }
-
- return err;
-}
-
-struct au_cpup_simple_args {
- int *errp;
- struct dentry *dentry;
- aufs_bindex_t bdst;
- loff_t len;
- unsigned int flags;
-};
-
-static void au_call_cpup_simple(void *args)
-{
- struct au_cpup_simple_args *a = args;
- *a->errp = au_cpup_simple(a->dentry, a->bdst, a->len, a->flags);
-}
-
-int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
- unsigned int flags)
-{
- int err, wkq_err;
- unsigned char do_sio;
- struct dentry *parent;
- struct inode *h_dir;
-
- parent = dget_parent(dentry);
- h_dir = au_h_iptr(parent->d_inode, bdst);
- do_sio = !!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE);
- if (!do_sio) {
- /*
- * testing CAP_MKNOD is for generic fs,
- * but CAP_FSETID is for xfs only, currently.
- */
- umode_t mode = dentry->d_inode->i_mode;
- do_sio = (((mode & (S_IFCHR | S_IFBLK))
- && !capable(CAP_MKNOD))
- || ((mode & (S_ISUID | S_ISGID))
- && !capable(CAP_FSETID)));
- }
- if (!do_sio)
- err = au_cpup_simple(dentry, bdst, len, flags);
- else {
- struct au_cpup_simple_args args = {
- .errp = &err,
- .dentry = dentry,
- .bdst = bdst,
- .len = len,
- .flags = flags
- };
- wkq_err = au_wkq_wait(au_call_cpup_simple, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * copyup the deleted file for writing.
- */
-static int au_do_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst,
- struct dentry *wh_dentry, struct file *file,
- loff_t len)
-{
- int err;
- aufs_bindex_t bstart;
- struct au_dinfo *dinfo;
- struct dentry *h_d_dst, *h_d_start;
- struct au_hdentry *hdp;
-
- dinfo = au_di(dentry);
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- bstart = dinfo->di_bstart;
- hdp = dinfo->di_hdentry;
- h_d_dst = hdp[0 + bdst].hd_dentry;
- dinfo->di_bstart = bdst;
- hdp[0 + bdst].hd_dentry = wh_dentry;
- h_d_start = hdp[0 + bstart].hd_dentry;
- if (file)
- hdp[0 + bstart].hd_dentry = au_hf_top(file)->f_dentry;
- err = au_cpup_single(dentry, bdst, bstart, len, !AuCpup_DTIME,
- /*h_parent*/NULL);
- if (!err && file) {
- err = au_reopen_nondir(file);
- hdp[0 + bstart].hd_dentry = h_d_start;
- }
- hdp[0 + bdst].hd_dentry = h_d_dst;
- dinfo->di_bstart = bstart;
-
- return err;
-}
-
-static int au_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
- struct file *file)
-{
- int err;
- struct au_dtime dt;
- struct dentry *parent, *h_parent, *wh_dentry;
- struct au_branch *br;
- struct path h_path;
-
- br = au_sbr(dentry->d_sb, bdst);
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bdst);
- wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out;
-
- h_path.dentry = h_parent;
- h_path.mnt = br->br_mnt;
- au_dtime_store(&dt, parent, &h_path);
- err = au_do_cpup_wh(dentry, bdst, wh_dentry, file, len);
- if (unlikely(err))
- goto out_wh;
-
- dget(wh_dentry);
- h_path.dentry = wh_dentry;
- if (!S_ISDIR(wh_dentry->d_inode->i_mode))
- err = vfsub_unlink(h_parent->d_inode, &h_path, /*force*/0);
- else
- err = vfsub_rmdir(h_parent->d_inode, &h_path);
- if (unlikely(err)) {
- AuIOErr("failed remove copied-up tmp file %.*s(%d)\n",
- AuDLNPair(wh_dentry), err);
- err = -EIO;
- }
- au_dtime_revert(&dt);
- au_set_hi_wh(dentry->d_inode, bdst, wh_dentry);
-
- out_wh:
- dput(wh_dentry);
- out:
- dput(parent);
- return err;
-}
-
-struct au_cpup_wh_args {
- int *errp;
- struct dentry *dentry;
- aufs_bindex_t bdst;
- loff_t len;
- struct file *file;
-};
-
-static void au_call_cpup_wh(void *args)
-{
- struct au_cpup_wh_args *a = args;
- *a->errp = au_cpup_wh(a->dentry, a->bdst, a->len, a->file);
-}
-
-int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
- struct file *file)
-{
- int err, wkq_err;
- struct dentry *parent, *h_orph, *h_parent, *h_dentry;
- struct inode *dir, *h_dir, *h_tmpdir, *h_inode;
- struct au_wbr *wbr;
-
- parent = dget_parent(dentry);
- dir = parent->d_inode;
- h_orph = NULL;
- h_parent = NULL;
- h_dir = au_igrab(au_h_iptr(dir, bdst));
- h_tmpdir = h_dir;
- if (!h_dir->i_nlink) {
- wbr = au_sbr(dentry->d_sb, bdst)->br_wbr;
- h_orph = wbr->wbr_orph;
-
- h_parent = dget(au_h_dptr(parent, bdst));
- au_set_h_dptr(parent, bdst, dget(h_orph));
- h_tmpdir = h_orph->d_inode;
- au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0);
-
- /* this temporary unlock is safe */
- if (file)
- h_dentry = au_hf_top(file)->f_dentry;
- else
- h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
- h_inode = h_dentry->d_inode;
- IMustLock(h_inode);
- mutex_unlock(&h_inode->i_mutex);
- mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3);
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- /* todo: au_h_open_pre()? */
- }
-
- if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE))
- err = au_cpup_wh(dentry, bdst, len, file);
- else {
- struct au_cpup_wh_args args = {
- .errp = &err,
- .dentry = dentry,
- .bdst = bdst,
- .len = len,
- .file = file
- };
- wkq_err = au_wkq_wait(au_call_cpup_wh, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- if (h_orph) {
- mutex_unlock(&h_tmpdir->i_mutex);
- /* todo: au_h_open_post()? */
- au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0);
- au_set_h_dptr(parent, bdst, h_parent);
- }
- iput(h_dir);
- dput(parent);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * generic routine for both of copy-up and copy-down.
- */
-/* cf. revalidate function in file.c */
-int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
- int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
- struct dentry *h_parent, void *arg),
- void *arg)
-{
- int err;
- struct au_pin pin;
- struct dentry *d, *parent, *h_parent, *real_parent;
-
- err = 0;
- parent = dget_parent(dentry);
- if (IS_ROOT(parent))
- goto out;
-
- au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2,
- au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE);
-
- /* do not use au_dpage */
- real_parent = parent;
- while (1) {
- dput(parent);
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bdst);
- if (h_parent)
- goto out; /* success */
-
- /* find top dir which is necessary to cpup */
- do {
- d = parent;
- dput(parent);
- parent = dget_parent(d);
- di_read_lock_parent3(parent, !AuLock_IR);
- h_parent = au_h_dptr(parent, bdst);
- di_read_unlock(parent, !AuLock_IR);
- } while (!h_parent);
-
- if (d != real_parent)
- di_write_lock_child3(d);
-
- /* somebody else might create while we were sleeping */
- if (!au_h_dptr(d, bdst) || !au_h_dptr(d, bdst)->d_inode) {
- if (au_h_dptr(d, bdst))
- au_update_dbstart(d);
-
- au_pin_set_dentry(&pin, d);
- err = au_do_pin(&pin);
- if (!err) {
- err = cp(d, bdst, h_parent, arg);
- au_unpin(&pin);
- }
- }
-
- if (d != real_parent)
- di_write_unlock(d);
- if (unlikely(err))
- break;
- }
-
- out:
- dput(parent);
- return err;
-}
-
-static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst,
- struct dentry *h_parent __maybe_unused ,
- void *arg __maybe_unused)
-{
- return au_sio_cpup_simple(dentry, bdst, -1, AuCpup_DTIME);
-}
-
-int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-{
- return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL);
-}
-
-int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-{
- int err;
- struct dentry *parent;
- struct inode *dir;
-
- parent = dget_parent(dentry);
- dir = parent->d_inode;
- err = 0;
- if (au_h_iptr(dir, bdst))
- goto out;
-
- di_read_unlock(parent, AuLock_IR);
- di_write_lock_parent(parent);
- /* someone else might change our inode while we were sleeping */
- if (!au_h_iptr(dir, bdst))
- err = au_cpup_dirs(dentry, bdst);
- di_downgrade_lock(parent, AuLock_IR);
-
- out:
- dput(parent);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * copy-up/down functions
- */
-
-#ifndef __AUFS_CPUP_H__
-#define __AUFS_CPUP_H__
-
-#ifdef __KERNEL__
-
-#include <linux/path.h>
-#include <linux/time.h>
-#include <linux/aufs_type.h>
-
-struct inode;
-struct file;
-
-void au_cpup_attr_flags(struct inode *dst, struct inode *src);
-void au_cpup_attr_timesizes(struct inode *inode);
-void au_cpup_attr_nlink(struct inode *inode, int force);
-void au_cpup_attr_changeable(struct inode *inode);
-void au_cpup_igen(struct inode *inode, struct inode *h_inode);
-void au_cpup_attr_all(struct inode *inode, int force);
-
-/* ---------------------------------------------------------------------- */
-
-/* cpup flags */
-#define AuCpup_DTIME 1 /* do dtime_store/revert */
-#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino,
- for link(2) */
-#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name)
-#define au_fset_cpup(flags, name) { (flags) |= AuCpup_##name; }
-#define au_fclr_cpup(flags, name) { (flags) &= ~AuCpup_##name; }
-
-int au_copy_file(struct file *dst, struct file *src, loff_t len);
-int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
- aufs_bindex_t bsrc, loff_t len, unsigned int flags,
- struct dentry *dst_parent);
-int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
- unsigned int flags);
-int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
- struct file *file);
-
-int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
- int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
- struct dentry *h_parent, void *arg),
- void *arg);
-int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-
-/* ---------------------------------------------------------------------- */
-
-/* keep timestamps when copyup */
-struct au_dtime {
- struct dentry *dt_dentry;
- struct path dt_h_path;
- struct timespec dt_atime, dt_mtime;
-};
-void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
- struct path *h_path);
-void au_dtime_revert(struct au_dtime *dt);
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_CPUP_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * debugfs interface
- */
-
-#include <linux/debugfs.h>
-#include "aufs.h"
-
-#ifndef CONFIG_SYSFS
-#error DEBUG_FS depends upon SYSFS
-#endif
-
-static struct dentry *dbgaufs;
-static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH;
-
-/* 20 is max digits length of ulong 64 */
-struct dbgaufs_arg {
- int n;
- char a[20 * 4];
-};
-
-/*
- * common function for all XINO files
- */
-static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
- struct file *file)
-{
- kfree(file->private_data);
- return 0;
-}
-
-static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt)
-{
- int err;
- struct kstat st;
- struct dbgaufs_arg *p;
-
- err = -ENOMEM;
- p = kmalloc(sizeof(*p), GFP_NOFS);
- if (unlikely(!p))
- goto out;
-
- err = 0;
- p->n = 0;
- file->private_data = p;
- if (!xf)
- goto out;
-
- err = vfs_getattr(xf->f_vfsmnt, xf->f_dentry, &st);
- if (!err) {
- if (do_fcnt)
- p->n = snprintf
- (p->a, sizeof(p->a), "%ld, %llux%lu %lld\n",
- (long)file_count(xf), st.blocks, st.blksize,
- (long long)st.size);
- else
- p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n",
- st.blocks, st.blksize,
- (long long)st.size);
- AuDebugOn(p->n >= sizeof(p->a));
- } else {
- p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
- err = 0;
- }
-
- out:
- return err;
-
-}
-
-static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct dbgaufs_arg *p;
-
- p = file->private_data;
- return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int dbgaufs_xib_open(struct inode *inode, struct file *file)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
-
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0);
- si_read_unlock(sb);
- return err;
-}
-
-static const struct file_operations dbgaufs_xib_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_xib_open,
- .release = dbgaufs_xi_release,
- .read = dbgaufs_xi_read
-};
-
-/* ---------------------------------------------------------------------- */
-
-#define DbgaufsXi_PREFIX "xi"
-
-static int dbgaufs_xino_open(struct inode *inode, struct file *file)
-{
- int err;
- long l;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
- struct file *xf;
- struct qstr *name;
-
- err = -ENOENT;
- xf = NULL;
- name = &file->f_dentry->d_name;
- if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
- || memcmp(name->name, DbgaufsXi_PREFIX,
- sizeof(DbgaufsXi_PREFIX) - 1)))
- goto out;
- err = strict_strtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
- if (unlikely(err))
- goto out;
-
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- if (l <= au_sbend(sb)) {
- xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
- err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1);
- } else
- err = -ENOENT;
- si_read_unlock(sb);
-
- out:
- return err;
-}
-
-static const struct file_operations dbgaufs_xino_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_xino_open,
- .release = dbgaufs_xi_release,
- .read = dbgaufs_xi_read
-};
-
-void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-{
- aufs_bindex_t bend;
- struct au_branch *br;
- struct au_xino_file *xi;
-
- if (!au_sbi(sb)->si_dbgaufs)
- return;
-
- bend = au_sbend(sb);
- for (; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- xi = &br->br_xino;
- if (xi->xi_dbgaufs) {
- debugfs_remove(xi->xi_dbgaufs);
- xi->xi_dbgaufs = NULL;
- }
- }
-}
-
-void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-{
- struct au_sbinfo *sbinfo;
- struct dentry *parent;
- struct au_branch *br;
- struct au_xino_file *xi;
- aufs_bindex_t bend;
- char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */
-
- sbinfo = au_sbi(sb);
- parent = sbinfo->si_dbgaufs;
- if (!parent)
- return;
-
- bend = au_sbend(sb);
- for (; bindex <= bend; bindex++) {
- snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
- br = au_sbr(sb, bindex);
- xi = &br->br_xino;
- AuDebugOn(xi->xi_dbgaufs);
- xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
- sbinfo, &dbgaufs_xino_fop);
- /* ignore an error */
- if (unlikely(!xi->xi_dbgaufs))
- AuWarn1("failed %s under debugfs\n", name);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_EXPORT
-static int dbgaufs_xigen_open(struct inode *inode, struct file *file)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
-
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0);
- si_read_unlock(sb);
- return err;
-}
-
-static const struct file_operations dbgaufs_xigen_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_xigen_open,
- .release = dbgaufs_xi_release,
- .read = dbgaufs_xi_read
-};
-
-static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
-{
- int err;
-
- /*
- * This function is a dynamic '__init' fucntion actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-
- err = -EIO;
- sbinfo->si_dbgaufs_xigen = debugfs_create_file
- ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
- &dbgaufs_xigen_fop);
- if (sbinfo->si_dbgaufs_xigen)
- err = 0;
-
- return err;
-}
-#else
-static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
-{
- return 0;
-}
-#endif /* CONFIG_AUFS_EXPORT */
-
-/* ---------------------------------------------------------------------- */
-
-void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
-{
- /*
- * This function is a dynamic '__init' fucntion actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-
- debugfs_remove_recursive(sbinfo->si_dbgaufs);
- sbinfo->si_dbgaufs = NULL;
- kobject_put(&sbinfo->si_kobj);
-}
-
-int dbgaufs_si_init(struct au_sbinfo *sbinfo)
-{
- int err;
- char name[SysaufsSiNameLen];
-
- /*
- * This function is a dynamic '__init' fucntion actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-
- err = -ENOENT;
- if (!dbgaufs) {
- AuErr1("/debug/aufs is uninitialized\n");
- goto out;
- }
-
- err = -EIO;
- sysaufs_name(sbinfo, name);
- sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
- if (unlikely(!sbinfo->si_dbgaufs))
- goto out;
- kobject_get(&sbinfo->si_kobj);
-
- sbinfo->si_dbgaufs_xib = debugfs_create_file
- ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
- &dbgaufs_xib_fop);
- if (unlikely(!sbinfo->si_dbgaufs_xib))
- goto out_dir;
-
- err = dbgaufs_xigen_init(sbinfo);
- if (!err)
- goto out; /* success */
-
- out_dir:
- dbgaufs_si_fin(sbinfo);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void dbgaufs_fin(void)
-{
- debugfs_remove(dbgaufs);
-}
-
-int __init dbgaufs_init(void)
-{
- int err;
-
- err = -EIO;
- dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
- if (dbgaufs)
- err = 0;
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * debugfs interface
- */
-
-#ifndef __DBGAUFS_H__
-#define __DBGAUFS_H__
-
-#ifdef __KERNEL__
-
-#include <linux/init.h>
-#include <linux/aufs_type.h>
-
-struct super_block;
-struct au_sbinfo;
-
-#ifdef CONFIG_DEBUG_FS
-/* dbgaufs.c */
-void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
-void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
-void dbgaufs_si_fin(struct au_sbinfo *sbinfo);
-int dbgaufs_si_init(struct au_sbinfo *sbinfo);
-void dbgaufs_fin(void);
-int __init dbgaufs_init(void);
-#else
-AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo)
-AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo)
-AuStubVoid(dbgaufs_fin, void)
-AuStubInt0(__init dbgaufs_init, void)
-#endif /* CONFIG_DEBUG_FS */
-
-#endif /* __KERNEL__ */
-#endif /* __DBGAUFS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sub-routines for dentry cache
- */
-
-#include "aufs.h"
-
-static void au_dpage_free(struct au_dpage *dpage)
-{
- int i;
- struct dentry **p;
-
- p = dpage->dentries;
- for (i = 0; i < dpage->ndentry; i++)
- dput(*p++);
- free_page((unsigned long)dpage->dentries);
-}
-
-int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
-{
- int err;
- void *p;
-
- err = -ENOMEM;
- dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
- if (unlikely(!dpages->dpages))
- goto out;
-
- p = (void *)__get_free_page(gfp);
- if (unlikely(!p))
- goto out_dpages;
-
- dpages->dpages[0].ndentry = 0;
- dpages->dpages[0].dentries = p;
- dpages->ndpage = 1;
- return 0; /* success */
-
- out_dpages:
- kfree(dpages->dpages);
- out:
- return err;
-}
-
-void au_dpages_free(struct au_dcsub_pages *dpages)
-{
- int i;
- struct au_dpage *p;
-
- p = dpages->dpages;
- for (i = 0; i < dpages->ndpage; i++)
- au_dpage_free(p++);
- kfree(dpages->dpages);
-}
-
-static int au_dpages_append(struct au_dcsub_pages *dpages,
- struct dentry *dentry, gfp_t gfp)
-{
- int err, sz;
- struct au_dpage *dpage;
- void *p;
-
- dpage = dpages->dpages + dpages->ndpage - 1;
- sz = PAGE_SIZE / sizeof(dentry);
- if (unlikely(dpage->ndentry >= sz)) {
- AuLabel(new dpage);
- err = -ENOMEM;
- sz = dpages->ndpage * sizeof(*dpages->dpages);
- p = au_kzrealloc(dpages->dpages, sz,
- sz + sizeof(*dpages->dpages), gfp);
- if (unlikely(!p))
- goto out;
-
- dpages->dpages = p;
- dpage = dpages->dpages + dpages->ndpage;
- p = (void *)__get_free_page(gfp);
- if (unlikely(!p))
- goto out;
-
- dpage->ndentry = 0;
- dpage->dentries = p;
- dpages->ndpage++;
- }
-
- dpage->dentries[dpage->ndentry++] = dget(dentry);
- return 0; /* success */
-
- out:
- return err;
-}
-
-int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
- au_dpages_test test, void *arg)
-{
- int err;
- struct dentry *this_parent = root;
- struct list_head *next;
- struct super_block *sb = root->d_sb;
-
- err = 0;
- spin_lock(&dcache_lock);
- repeat:
- next = this_parent->d_subdirs.next;
- resume:
- if (this_parent->d_sb == sb
- && !IS_ROOT(this_parent)
- && atomic_read(&this_parent->d_count)
- && this_parent->d_inode
- && (!test || test(this_parent, arg))) {
- err = au_dpages_append(dpages, this_parent, GFP_ATOMIC);
- if (unlikely(err))
- goto out;
- }
-
- while (next != &this_parent->d_subdirs) {
- struct list_head *tmp = next;
- struct dentry *dentry = list_entry(tmp, struct dentry,
- d_u.d_child);
- next = tmp->next;
- if (/*d_unhashed(dentry) || */!dentry->d_inode)
- continue;
- if (!list_empty(&dentry->d_subdirs)) {
- this_parent = dentry;
- goto repeat;
- }
- if (dentry->d_sb == sb
- && atomic_read(&dentry->d_count)
- && (!test || test(dentry, arg))) {
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- if (unlikely(err))
- goto out;
- }
- }
-
- if (this_parent != root) {
- next = this_parent->d_u.d_child.next;
- this_parent = this_parent->d_parent; /* dcache_lock is locked */
- goto resume;
- }
- out:
- spin_unlock(&dcache_lock);
- return err;
-}
-
-int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
- int do_include, au_dpages_test test, void *arg)
-{
- int err;
-
- err = 0;
- spin_lock(&dcache_lock);
- if (do_include && (!test || test(dentry, arg))) {
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- if (unlikely(err))
- goto out;
- }
- while (!IS_ROOT(dentry)) {
- dentry = dentry->d_parent; /* dcache_lock is locked */
- if (!test || test(dentry, arg)) {
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- if (unlikely(err))
- break;
- }
- }
-
- out:
- spin_unlock(&dcache_lock);
-
- return err;
-}
-
-int au_test_subdir(struct dentry *d1, struct dentry *d2)
-{
- struct path path[2] = {
- {
- .dentry = d1
- },
- {
- .dentry = d2
- }
- };
-
- return path_is_under(path + 0, path + 1);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sub-routines for dentry cache
- */
-
-#ifndef __AUFS_DCSUB_H__
-#define __AUFS_DCSUB_H__
-
-#ifdef __KERNEL__
-
-#include <linux/types.h>
-
-struct dentry;
-
-struct au_dpage {
- int ndentry;
- struct dentry **dentries;
-};
-
-struct au_dcsub_pages {
- int ndpage;
- struct au_dpage *dpages;
-};
-
-/* ---------------------------------------------------------------------- */
-
-int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
-void au_dpages_free(struct au_dcsub_pages *dpages);
-typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
-int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
- au_dpages_test test, void *arg);
-int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
- int do_include, au_dpages_test test, void *arg);
-int au_test_subdir(struct dentry *d1, struct dentry *d2);
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DCSUB_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * debug print functions
- */
-
-#include <linux/module.h>
-#include <linux/vt_kern.h>
-#include "aufs.h"
-
-int aufs_debug;
-MODULE_PARM_DESC(debug, "debug print");
-module_param_named(debug, aufs_debug, int, S_IRUGO | S_IWUSR | S_IWGRP);
-
-char *au_plevel = KERN_DEBUG;
-#define dpri(fmt, ...) do { \
- if (au_debug_test()) \
- printk("%s" fmt, au_plevel, ##__VA_ARGS__); \
-} while (0)
-
-/* ---------------------------------------------------------------------- */
-
-void au_dpri_whlist(struct au_nhash *whlist)
-{
- unsigned long ul, n;
- struct hlist_head *head;
- struct au_vdir_wh *tpos;
- struct hlist_node *pos;
-
- n = whlist->nh_num;
- head = whlist->nh_head;
- for (ul = 0; ul < n; ul++) {
- hlist_for_each_entry(tpos, pos, head, wh_hash)
- dpri("b%d, %.*s, %d\n",
- tpos->wh_bindex,
- tpos->wh_str.len, tpos->wh_str.name,
- tpos->wh_str.len);
- head++;
- }
-}
-
-void au_dpri_vdir(struct au_vdir *vdir)
-{
- unsigned long ul;
- union au_vdir_deblk_p p;
- unsigned char *o;
-
- if (!vdir || IS_ERR(vdir)) {
- dpri("err %ld\n", PTR_ERR(vdir));
- return;
- }
-
- dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n",
- vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk,
- vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version);
- for (ul = 0; ul < vdir->vd_nblk; ul++) {
- p.deblk = vdir->vd_deblk[ul];
- o = p.deblk;
- dpri("[%lu]: %p\n", ul, o);
- }
-}
-
-static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode,
- struct dentry *wh)
-{
- char *n = NULL;
- int l = 0;
-
- if (!inode || IS_ERR(inode)) {
- dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
- return -1;
- }
-
- /* the type of i_blocks depends upon CONFIG_LSF */
- BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
- && sizeof(inode->i_blocks) != sizeof(u64));
- if (wh) {
- n = (void *)wh->d_name.name;
- l = wh->d_name.len;
- }
-
- dpri("i%d: i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu,"
- " ct %lld, np %lu, st 0x%lx, f 0x%x, g %x%s%.*s\n",
- bindex,
- inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
- atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
- i_size_read(inode), (unsigned long long)inode->i_blocks,
- (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff,
- inode->i_mapping ? inode->i_mapping->nrpages : 0,
- inode->i_state, inode->i_flags, inode->i_generation,
- l ? ", wh " : "", l, n);
- return 0;
-}
-
-void au_dpri_inode(struct inode *inode)
-{
- struct au_iinfo *iinfo;
- aufs_bindex_t bindex;
- int err;
-
- err = do_pri_inode(-1, inode, NULL);
- if (err || !au_test_aufs(inode->i_sb))
- return;
-
- iinfo = au_ii(inode);
- if (!iinfo)
- return;
- dpri("i-1: bstart %d, bend %d, gen %d\n",
- iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode));
- if (iinfo->ii_bstart < 0)
- return;
- for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++)
- do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode,
- iinfo->ii_hinode[0 + bindex].hi_whdentry);
-}
-
-static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
-{
- struct dentry *wh = NULL;
-
- if (!dentry || IS_ERR(dentry)) {
- dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
- return -1;
- }
- /* do not call dget_parent() here */
- dpri("d%d: %.*s?/%.*s, %s, cnt %d, flags 0x%x\n",
- bindex,
- AuDLNPair(dentry->d_parent), AuDLNPair(dentry),
- dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
- atomic_read(&dentry->d_count), dentry->d_flags);
- if (bindex >= 0 && dentry->d_inode && au_test_aufs(dentry->d_sb)) {
- struct au_iinfo *iinfo = au_ii(dentry->d_inode);
- if (iinfo)
- wh = iinfo->ii_hinode[0 + bindex].hi_whdentry;
- }
- do_pri_inode(bindex, dentry->d_inode, wh);
- return 0;
-}
-
-void au_dpri_dentry(struct dentry *dentry)
-{
- struct au_dinfo *dinfo;
- aufs_bindex_t bindex;
- int err;
- struct au_hdentry *hdp;
-
- err = do_pri_dentry(-1, dentry);
- if (err || !au_test_aufs(dentry->d_sb))
- return;
-
- dinfo = au_di(dentry);
- if (!dinfo)
- return;
- dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n",
- dinfo->di_bstart, dinfo->di_bend,
- dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry));
- if (dinfo->di_bstart < 0)
- return;
- hdp = dinfo->di_hdentry;
- for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++)
- do_pri_dentry(bindex, hdp[0 + bindex].hd_dentry);
-}
-
-static int do_pri_file(aufs_bindex_t bindex, struct file *file)
-{
- char a[32];
-
- if (!file || IS_ERR(file)) {
- dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
- return -1;
- }
- a[0] = 0;
- if (bindex < 0
- && file->f_dentry
- && au_test_aufs(file->f_dentry->d_sb)
- && au_fi(file))
- snprintf(a, sizeof(a), ", mmapped %d",
- !!au_fi(file)->fi_hvmop);
- dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, pos %llu%s\n",
- bindex, file->f_mode, file->f_flags, (long)file_count(file),
- file->f_pos, a);
- if (file->f_dentry)
- do_pri_dentry(bindex, file->f_dentry);
- return 0;
-}
-
-void au_dpri_file(struct file *file)
-{
- struct au_finfo *finfo;
- struct au_fidir *fidir;
- struct au_hfile *hfile;
- aufs_bindex_t bindex;
- int err;
-
- err = do_pri_file(-1, file);
- if (err || !file->f_dentry || !au_test_aufs(file->f_dentry->d_sb))
- return;
-
- finfo = au_fi(file);
- if (!finfo)
- return;
- if (finfo->fi_btop < 0)
- return;
- fidir = finfo->fi_hdir;
- if (!fidir)
- do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file);
- else
- for (bindex = finfo->fi_btop; bindex <= fidir->fd_bbot;
- bindex++) {
- hfile = fidir->fd_hfile + bindex;
- do_pri_file(bindex, hfile ? hfile->hf_file : NULL);
- }
-}
-
-static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br)
-{
- struct vfsmount *mnt;
- struct super_block *sb;
-
- if (!br || IS_ERR(br))
- goto out;
- mnt = br->br_mnt;
- if (!mnt || IS_ERR(mnt))
- goto out;
- sb = mnt->mnt_sb;
- if (!sb || IS_ERR(sb))
- goto out;
-
- dpri("s%d: {perm 0x%x, cnt %d, wbr %p}, "
- "%s, dev 0x%02x%02x, flags 0x%lx, cnt(BIAS) %d, active %d, "
- "xino %d\n",
- bindex, br->br_perm, atomic_read(&br->br_count), br->br_wbr,
- au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev),
- sb->s_flags, sb->s_count - S_BIAS,
- atomic_read(&sb->s_active), !!br->br_xino.xi_file);
- return 0;
-
- out:
- dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
- return -1;
-}
-
-void au_dpri_sb(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- aufs_bindex_t bindex;
- int err;
- /* to reuduce stack size */
- struct {
- struct vfsmount mnt;
- struct au_branch fake;
- } *a;
-
- /* this function can be called from magic sysrq */
- a = kzalloc(sizeof(*a), GFP_ATOMIC);
- if (unlikely(!a)) {
- dpri("no memory\n");
- return;
- }
-
- a->mnt.mnt_sb = sb;
- a->fake.br_perm = 0;
- a->fake.br_mnt = &a->mnt;
- a->fake.br_xino.xi_file = NULL;
- atomic_set(&a->fake.br_count, 0);
- smp_mb(); /* atomic_set */
- err = do_pri_br(-1, &a->fake);
- kfree(a);
- dpri("dev 0x%x\n", sb->s_dev);
- if (err || !au_test_aufs(sb))
- return;
-
- sbinfo = au_sbi(sb);
- if (!sbinfo)
- return;
- dpri("nw %d, gen %u, kobj %d\n",
- atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation,
- atomic_read(&sbinfo->si_kobj.kref.refcount));
- for (bindex = 0; bindex <= sbinfo->si_bend; bindex++)
- do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_dbg_sleep_jiffy(int jiffy)
-{
- while (jiffy)
- jiffy = schedule_timeout_uninterruptible(jiffy);
-}
-
-void au_dbg_iattr(struct iattr *ia)
-{
-#define AuBit(name) if (ia->ia_valid & ATTR_ ## name) \
- dpri(#name "\n")
- AuBit(MODE);
- AuBit(UID);
- AuBit(GID);
- AuBit(SIZE);
- AuBit(ATIME);
- AuBit(MTIME);
- AuBit(CTIME);
- AuBit(ATIME_SET);
- AuBit(MTIME_SET);
- AuBit(FORCE);
- AuBit(ATTR_FLAG);
- AuBit(KILL_SUID);
- AuBit(KILL_SGID);
- AuBit(FILE);
- AuBit(KILL_PRIV);
- AuBit(OPEN);
- AuBit(TIMES_SET);
-#undef AuBit
- dpri("ia_file %p\n", ia->ia_file);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen)
-{
- struct dentry *parent;
-
- parent = dget_parent(dentry);
- AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode)
- || IS_ROOT(dentry)
- || au_digen(parent) != sigen);
- dput(parent);
-}
-
-void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen)
-{
- struct dentry *parent;
-
- parent = dget_parent(dentry);
- AuDebugOn(S_ISDIR(dentry->d_inode->i_mode)
- || au_digen(parent) != sigen);
- dput(parent);
-}
-
-void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
-{
- int err, i, j;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- AuDebugOn(err);
- err = au_dcsub_pages_rev(&dpages, parent, /*do_include*/1, NULL, NULL);
- AuDebugOn(err);
- for (i = dpages.ndpage - 1; !err && i >= 0; i--) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- for (j = dpage->ndentry - 1; !err && j >= 0; j--)
- AuDebugOn(au_digen(dentries[j]) != sigen);
- }
- au_dpages_free(&dpages);
-}
-
-void au_dbg_verify_kthread(void)
-{
- if (au_test_wkq(current)) {
- au_dbg_blocked();
- BUG();
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_debug_sbinfo_init(struct au_sbinfo *sbinfo __maybe_unused)
-{
-#ifdef AuForceNoPlink
- au_opt_clr(sbinfo->si_mntflags, PLINK);
-#endif
-#ifdef AuForceNoXino
- au_opt_clr(sbinfo->si_mntflags, XINO);
-#endif
-#ifdef AuForceNoRefrof
- au_opt_clr(sbinfo->si_mntflags, REFROF);
-#endif
-#ifdef AuForceHnotify
- au_opt_set_udba(sbinfo->si_mntflags, UDBA_HNOTIFY);
-#endif
-#ifdef AuForceRd0
- sbinfo->si_rdblk = 0;
- sbinfo->si_rdhash = 0;
-#endif
-}
-
-int __init au_debug_init(void)
-{
- aufs_bindex_t bindex;
- struct au_vdir_destr destr;
-
- bindex = -1;
- AuDebugOn(bindex >= 0);
-
- destr.len = -1;
- AuDebugOn(destr.len < NAME_MAX);
-
-#ifdef CONFIG_4KSTACKS
- pr_warning("CONFIG_4KSTACKS is defined.\n");
-#endif
-
-#ifdef AuForceNoBrs
- sysaufs_brs = 0;
-#endif
-
- return 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * debug print functions
- */
-
-#ifndef __AUFS_DEBUG_H__
-#define __AUFS_DEBUG_H__
-
-#ifdef __KERNEL__
-
-#include <asm/system.h>
-#include <linux/bug.h>
-/* #include <linux/err.h> */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-/* #include <linux/kernel.h> */
-#include <linux/delay.h>
-/* #include <linux/kd.h> */
-/* #include <linux/vt_kern.h> */
-#include <linux/sysrq.h>
-#include <linux/aufs_type.h>
-
-#include <asm/system.h>
-
-#ifdef CONFIG_AUFS_DEBUG
-#define AuDebugOn(a) BUG_ON(a)
-
-/* module parameter */
-extern int aufs_debug;
-static inline void au_debug(int n)
-{
- aufs_debug = n;
- smp_mb();
-}
-
-static inline int au_debug_test(void)
-{
- return aufs_debug;
-}
-#else
-#define AuDebugOn(a) do {} while (0)
-AuStubVoid(au_debug, int n)
-AuStubInt0(au_debug_test, void)
-#endif /* CONFIG_AUFS_DEBUG */
-
-/* ---------------------------------------------------------------------- */
-
-/* debug print */
-
-#define AuDbg(fmt, ...) do { \
- if (au_debug_test()) \
- pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \
-} while (0)
-#define AuLabel(l) AuDbg(#l "\n")
-#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__)
-#define AuWarn1(fmt, ...) do { \
- static unsigned char _c; \
- if (!_c++) \
- pr_warning(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define AuErr1(fmt, ...) do { \
- static unsigned char _c; \
- if (!_c++) \
- pr_err(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define AuIOErr1(fmt, ...) do { \
- static unsigned char _c; \
- if (!_c++) \
- AuIOErr(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define AuUnsupportMsg "This operation is not supported." \
- " Please report this application to aufs-users ML."
-#define AuUnsupport(fmt, ...) do { \
- pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
- dump_stack(); \
-} while (0)
-
-#define AuTraceErr(e) do { \
- if (unlikely((e) < 0)) \
- AuDbg("err %d\n", (int)(e)); \
-} while (0)
-
-#define AuTraceErrPtr(p) do { \
- if (IS_ERR(p)) \
- AuDbg("err %ld\n", PTR_ERR(p)); \
-} while (0)
-
-/* dirty macros for debug print, use with "%.*s" and caution */
-#define AuLNPair(qstr) (qstr)->len, (qstr)->name
-#define AuDLNPair(d) AuLNPair(&(d)->d_name)
-
-/* ---------------------------------------------------------------------- */
-
-struct au_sbinfo;
-struct au_finfo;
-struct dentry;
-#ifdef CONFIG_AUFS_DEBUG
-extern char *au_plevel;
-struct au_nhash;
-void au_dpri_whlist(struct au_nhash *whlist);
-struct au_vdir;
-void au_dpri_vdir(struct au_vdir *vdir);
-struct inode;
-void au_dpri_inode(struct inode *inode);
-void au_dpri_dentry(struct dentry *dentry);
-struct file;
-void au_dpri_file(struct file *filp);
-struct super_block;
-void au_dpri_sb(struct super_block *sb);
-
-void au_dbg_sleep_jiffy(int jiffy);
-struct iattr;
-void au_dbg_iattr(struct iattr *ia);
-
-void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen);
-void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen);
-void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
-void au_dbg_verify_kthread(void);
-
-int __init au_debug_init(void);
-void au_debug_sbinfo_init(struct au_sbinfo *sbinfo);
-#define AuDbgWhlist(w) do { \
- AuDbg(#w "\n"); \
- au_dpri_whlist(w); \
-} while (0)
-
-#define AuDbgVdir(v) do { \
- AuDbg(#v "\n"); \
- au_dpri_vdir(v); \
-} while (0)
-
-#define AuDbgInode(i) do { \
- AuDbg(#i "\n"); \
- au_dpri_inode(i); \
-} while (0)
-
-#define AuDbgDentry(d) do { \
- AuDbg(#d "\n"); \
- au_dpri_dentry(d); \
-} while (0)
-
-#define AuDbgFile(f) do { \
- AuDbg(#f "\n"); \
- au_dpri_file(f); \
-} while (0)
-
-#define AuDbgSb(sb) do { \
- AuDbg(#sb "\n"); \
- au_dpri_sb(sb); \
-} while (0)
-
-#define AuDbgSleep(sec) do { \
- AuDbg("sleep %d sec\n", sec); \
- ssleep(sec); \
-} while (0)
-
-#define AuDbgSleepJiffy(jiffy) do { \
- AuDbg("sleep %d jiffies\n", jiffy); \
- au_dbg_sleep_jiffy(jiffy); \
-} while (0)
-
-#define AuDbgIAttr(ia) do { \
- AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \
- au_dbg_iattr(ia); \
-} while (0)
-
-#define AuDbgSym(addr) do { \
- char sym[KSYM_SYMBOL_LEN]; \
- sprint_symbol(sym, (unsigned long)addr); \
- AuDbg("%s\n", sym); \
-} while (0)
-
-#define AuInfoSym(addr) do { \
- char sym[KSYM_SYMBOL_LEN]; \
- sprint_symbol(sym, (unsigned long)addr); \
- AuInfo("%s\n", sym); \
-} while (0)
-#else
-AuStubVoid(au_dbg_verify_dir_parent, struct dentry *dentry, unsigned int sigen)
-AuStubVoid(au_dbg_verify_nondir_parent, struct dentry *dentry,
- unsigned int sigen)
-AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
-AuStubVoid(au_dbg_verify_kthread, void)
-AuStubInt0(__init au_debug_init, void)
-AuStubVoid(au_debug_sbinfo_init, struct au_sbinfo *sbinfo)
-
-#define AuDbgWhlist(w) do {} while (0)
-#define AuDbgVdir(v) do {} while (0)
-#define AuDbgInode(i) do {} while (0)
-#define AuDbgDentry(d) do {} while (0)
-#define AuDbgFile(f) do {} while (0)
-#define AuDbgSb(sb) do {} while (0)
-#define AuDbgSleep(sec) do {} while (0)
-#define AuDbgSleepJiffy(jiffy) do {} while (0)
-#define AuDbgIAttr(ia) do {} while (0)
-#define AuDbgSym(addr) do {} while (0)
-#define AuInfoSym(addr) do {} while (0)
-#endif /* CONFIG_AUFS_DEBUG */
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_MAGIC_SYSRQ
-int __init au_sysrq_init(void);
-void au_sysrq_fin(void);
-
-#ifdef CONFIG_HW_CONSOLE
-#define au_dbg_blocked() do { \
- WARN_ON(1); \
- handle_sysrq('w', vc_cons[fg_console].d->vc_tty); \
-} while (0)
-#else
-AuStubVoid(au_dbg_blocked, void)
-#endif
-
-#else
-AuStubInt0(__init au_sysrq_init, void)
-AuStubVoid(au_sysrq_fin, void)
-AuStubVoid(au_dbg_blocked, void)
-#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DEBUG_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * lookup and dentry operations
- */
-
-#include <linux/namei.h>
-#include "aufs.h"
-
-static void au_h_nd(struct nameidata *h_nd, struct nameidata *nd)
-{
- if (nd) {
- *h_nd = *nd;
-
- /*
- * gave up supporting LOOKUP_CREATE/OPEN for lower fs,
- * due to whiteout and branch permission.
- */
- h_nd->flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE
- | LOOKUP_FOLLOW);
- /* unnecessary? */
- h_nd->intent.open.file = NULL;
- } else
- memset(h_nd, 0, sizeof(*h_nd));
-}
-
-struct au_lkup_one_args {
- struct dentry **errp;
- struct qstr *name;
- struct dentry *h_parent;
- struct au_branch *br;
- struct nameidata *nd;
-};
-
-struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent,
- struct au_branch *br, struct nameidata *nd)
-{
- struct dentry *h_dentry;
- int err;
- struct nameidata h_nd;
-
- if (au_test_fs_null_nd(h_parent->d_sb))
- return vfsub_lookup_one_len(name->name, h_parent, name->len);
-
- au_h_nd(&h_nd, nd);
- h_nd.path.dentry = h_parent;
- h_nd.path.mnt = br->br_mnt;
-
- err = __lookup_one_len(name->name, &h_nd.last, NULL, name->len);
- h_dentry = ERR_PTR(err);
- if (!err) {
- path_get(&h_nd.path);
- h_dentry = vfsub_lookup_hash(&h_nd);
- path_put(&h_nd.path);
- }
-
- AuTraceErrPtr(h_dentry);
- return h_dentry;
-}
-
-static void au_call_lkup_one(void *args)
-{
- struct au_lkup_one_args *a = args;
- *a->errp = au_lkup_one(a->name, a->h_parent, a->br, a->nd);
-}
-
-#define AuLkup_ALLOW_NEG 1
-#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name)
-#define au_fset_lkup(flags, name) { (flags) |= AuLkup_##name; }
-#define au_fclr_lkup(flags, name) { (flags) &= ~AuLkup_##name; }
-
-struct au_do_lookup_args {
- unsigned int flags;
- mode_t type;
- struct nameidata *nd;
-};
-
-/*
- * returns positive/negative dentry, NULL or an error.
- * NULL means whiteout-ed or not-found.
- */
-static struct dentry*
-au_do_lookup(struct dentry *h_parent, struct dentry *dentry,
- aufs_bindex_t bindex, struct qstr *wh_name,
- struct au_do_lookup_args *args)
-{
- struct dentry *h_dentry;
- struct inode *h_inode, *inode;
- struct au_branch *br;
- int wh_found, opq;
- unsigned char wh_able;
- const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG);
-
- wh_found = 0;
- br = au_sbr(dentry->d_sb, bindex);
- wh_able = !!au_br_whable(br->br_perm);
- if (wh_able)
- wh_found = au_wh_test(h_parent, wh_name, br, /*try_sio*/0);
- h_dentry = ERR_PTR(wh_found);
- if (!wh_found)
- goto real_lookup;
- if (unlikely(wh_found < 0))
- goto out;
-
- /* We found a whiteout */
- /* au_set_dbend(dentry, bindex); */
- au_set_dbwh(dentry, bindex);
- if (!allow_neg)
- return NULL; /* success */
-
- real_lookup:
- h_dentry = au_lkup_one(&dentry->d_name, h_parent, br, args->nd);
- if (IS_ERR(h_dentry))
- goto out;
-
- h_inode = h_dentry->d_inode;
- if (!h_inode) {
- if (!allow_neg)
- goto out_neg;
- } else if (wh_found
- || (args->type && args->type != (h_inode->i_mode & S_IFMT)))
- goto out_neg;
-
- if (au_dbend(dentry) <= bindex)
- au_set_dbend(dentry, bindex);
- if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
- au_set_dbstart(dentry, bindex);
- au_set_h_dptr(dentry, bindex, h_dentry);
-
- inode = dentry->d_inode;
- if (!h_inode || !S_ISDIR(h_inode->i_mode) || !wh_able
- || (inode && !S_ISDIR(inode->i_mode)))
- goto out; /* success */
-
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- opq = au_diropq_test(h_dentry, br);
- mutex_unlock(&h_inode->i_mutex);
- if (opq > 0)
- au_set_dbdiropq(dentry, bindex);
- else if (unlikely(opq < 0)) {
- au_set_h_dptr(dentry, bindex, NULL);
- h_dentry = ERR_PTR(opq);
- }
- goto out;
-
- out_neg:
- dput(h_dentry);
- h_dentry = NULL;
- out:
- return h_dentry;
-}
-
-static int au_test_shwh(struct super_block *sb, const struct qstr *name)
-{
- if (unlikely(!au_opt_test(au_mntflags(sb), SHWH)
- && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
- return -EPERM;
- return 0;
-}
-
-/*
- * returns the number of lower positive dentries,
- * otherwise an error.
- * can be called at unlinking with @type is zero.
- */
-int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type,
- struct nameidata *nd)
-{
- int npositive, err;
- aufs_bindex_t bindex, btail, bdiropq;
- unsigned char isdir;
- struct qstr whname;
- struct au_do_lookup_args args = {
- .flags = 0,
- .type = type,
- .nd = nd
- };
- const struct qstr *name = &dentry->d_name;
- struct dentry *parent;
- struct inode *inode;
-
- err = au_test_shwh(dentry->d_sb, name);
- if (unlikely(err))
- goto out;
-
- err = au_wh_name_alloc(&whname, name);
- if (unlikely(err))
- goto out;
-
- inode = dentry->d_inode;
- isdir = !!(inode && S_ISDIR(inode->i_mode));
- if (!type)
- au_fset_lkup(args.flags, ALLOW_NEG);
-
- npositive = 0;
- parent = dget_parent(dentry);
- btail = au_dbtaildir(parent);
- for (bindex = bstart; bindex <= btail; bindex++) {
- struct dentry *h_parent, *h_dentry;
- struct inode *h_inode, *h_dir;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry) {
- if (h_dentry->d_inode)
- npositive++;
- if (type != S_IFDIR)
- break;
- continue;
- }
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent)
- continue;
- h_dir = h_parent->d_inode;
- if (!h_dir || !S_ISDIR(h_dir->i_mode))
- continue;
-
- mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
- h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname,
- &args);
- mutex_unlock(&h_dir->i_mutex);
- err = PTR_ERR(h_dentry);
- if (IS_ERR(h_dentry))
- goto out_parent;
- au_fclr_lkup(args.flags, ALLOW_NEG);
-
- if (au_dbwh(dentry) >= 0)
- break;
- if (!h_dentry)
- continue;
- h_inode = h_dentry->d_inode;
- if (!h_inode)
- continue;
- npositive++;
- if (!args.type)
- args.type = h_inode->i_mode & S_IFMT;
- if (args.type != S_IFDIR)
- break;
- else if (isdir) {
- /* the type of lower may be different */
- bdiropq = au_dbdiropq(dentry);
- if (bdiropq >= 0 && bdiropq <= bindex)
- break;
- }
- }
-
- if (npositive) {
- AuLabel(positive);
- au_update_dbstart(dentry);
- }
- err = npositive;
- if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
- && au_dbstart(dentry) < 0))
- /* both of real entry and whiteout found */
- err = -EIO;
-
- out_parent:
- dput(parent);
- kfree(whname.name);
- out:
- return err;
-}
-
-struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent,
- struct au_branch *br)
-{
- struct dentry *dentry;
- int wkq_err;
-
- if (!au_test_h_perm_sio(parent->d_inode, MAY_EXEC))
- dentry = au_lkup_one(name, parent, br, /*nd*/NULL);
- else {
- struct au_lkup_one_args args = {
- .errp = &dentry,
- .name = name,
- .h_parent = parent,
- .br = br,
- .nd = NULL
- };
-
- wkq_err = au_wkq_wait(au_call_lkup_one, &args);
- if (unlikely(wkq_err))
- dentry = ERR_PTR(wkq_err);
- }
-
- return dentry;
-}
-
-/*
- * lookup @dentry on @bindex which should be negative.
- */
-int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex)
-{
- int err;
- struct dentry *parent, *h_parent, *h_dentry;
-
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bindex);
- h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent,
- au_sbr(dentry->d_sb, bindex));
- err = PTR_ERR(h_dentry);
- if (IS_ERR(h_dentry))
- goto out;
- if (unlikely(h_dentry->d_inode)) {
- err = -EIO;
- AuIOErr("b%d %.*s should be negative.\n",
- bindex, AuDLNPair(h_dentry));
- dput(h_dentry);
- goto out;
- }
-
- err = 0;
- if (bindex < au_dbstart(dentry))
- au_set_dbstart(dentry, bindex);
- if (au_dbend(dentry) < bindex)
- au_set_dbend(dentry, bindex);
- au_set_h_dptr(dentry, bindex, h_dentry);
-
- out:
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* subset of struct inode */
-struct au_iattr {
- unsigned long i_ino;
- /* unsigned int i_nlink; */
- uid_t i_uid;
- gid_t i_gid;
- u64 i_version;
-/*
- loff_t i_size;
- blkcnt_t i_blocks;
-*/
- umode_t i_mode;
-};
-
-static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode)
-{
- ia->i_ino = h_inode->i_ino;
- /* ia->i_nlink = h_inode->i_nlink; */
- ia->i_uid = h_inode->i_uid;
- ia->i_gid = h_inode->i_gid;
- ia->i_version = h_inode->i_version;
-/*
- ia->i_size = h_inode->i_size;
- ia->i_blocks = h_inode->i_blocks;
-*/
- ia->i_mode = (h_inode->i_mode & S_IFMT);
-}
-
-static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode)
-{
- return ia->i_ino != h_inode->i_ino
- /* || ia->i_nlink != h_inode->i_nlink */
- || ia->i_uid != h_inode->i_uid
- || ia->i_gid != h_inode->i_gid
- || ia->i_version != h_inode->i_version
-/*
- || ia->i_size != h_inode->i_size
- || ia->i_blocks != h_inode->i_blocks
-*/
- || ia->i_mode != (h_inode->i_mode & S_IFMT);
-}
-
-static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent,
- struct au_branch *br)
-{
- int err;
- struct au_iattr ia;
- struct inode *h_inode;
- struct dentry *h_d;
- struct super_block *h_sb;
-
- err = 0;
- memset(&ia, -1, sizeof(ia));
- h_sb = h_dentry->d_sb;
- h_inode = h_dentry->d_inode;
- if (h_inode)
- au_iattr_save(&ia, h_inode);
- else if (au_test_nfs(h_sb) || au_test_fuse(h_sb))
- /* nfs d_revalidate may return 0 for negative dentry */
- /* fuse d_revalidate always return 0 for negative dentry */
- goto out;
-
- /* main purpose is namei.c:cached_lookup() and d_revalidate */
- h_d = au_lkup_one(&h_dentry->d_name, h_parent, br, /*nd*/NULL);
- err = PTR_ERR(h_d);
- if (IS_ERR(h_d))
- goto out;
-
- err = 0;
- if (unlikely(h_d != h_dentry
- || h_d->d_inode != h_inode
- || (h_inode && au_iattr_test(&ia, h_inode))))
- err = au_busy_or_stale();
- dput(h_d);
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
- struct dentry *h_parent, struct au_branch *br)
-{
- int err;
-
- err = 0;
- if (udba == AuOpt_UDBA_REVAL) {
- IMustLock(h_dir);
- err = (h_dentry->d_parent->d_inode != h_dir);
- } else if (udba == AuOpt_UDBA_HNOTIFY)
- err = au_h_verify_dentry(h_dentry, h_parent, br);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_do_refresh_hdentry(struct au_hdentry *p, struct au_dinfo *dinfo,
- struct dentry *parent)
-{
- struct dentry *h_d, *h_dp;
- struct au_hdentry tmp, *q;
- struct super_block *sb;
- aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- bend = dinfo->di_bend;
- bwh = dinfo->di_bwh;
- bdiropq = dinfo->di_bdiropq;
- for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
- h_d = p->hd_dentry;
- if (!h_d)
- continue;
-
- h_dp = dget_parent(h_d);
- if (h_dp == au_h_dptr(parent, bindex)) {
- dput(h_dp);
- continue;
- }
-
- new_bindex = au_find_dbindex(parent, h_dp);
- dput(h_dp);
- if (dinfo->di_bwh == bindex)
- bwh = new_bindex;
- if (dinfo->di_bdiropq == bindex)
- bdiropq = new_bindex;
- if (new_bindex < 0) {
- au_hdput(p);
- p->hd_dentry = NULL;
- continue;
- }
-
- /* swap two lower dentries, and loop again */
- q = dinfo->di_hdentry + new_bindex;
- tmp = *q;
- *q = *p;
- *p = tmp;
- if (tmp.hd_dentry) {
- bindex--;
- p--;
- }
- }
-
- sb = parent->d_sb;
- dinfo->di_bwh = -1;
- if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh))
- dinfo->di_bwh = bwh;
-
- dinfo->di_bdiropq = -1;
- if (bdiropq >= 0
- && bdiropq <= au_sbend(sb)
- && au_sbr_whable(sb, bdiropq))
- dinfo->di_bdiropq = bdiropq;
-
- bend = au_dbend(parent);
- p = dinfo->di_hdentry;
- for (bindex = 0; bindex <= bend; bindex++, p++)
- if (p->hd_dentry) {
- dinfo->di_bstart = bindex;
- break;
- }
-
- p = dinfo->di_hdentry + bend;
- for (bindex = bend; bindex >= 0; bindex--, p--)
- if (p->hd_dentry) {
- dinfo->di_bend = bindex;
- break;
- }
-}
-
-/*
- * returns the number of found lower positive dentries,
- * otherwise an error.
- */
-int au_refresh_hdentry(struct dentry *dentry, mode_t type)
-{
- int npositive, err;
- unsigned int sigen;
- aufs_bindex_t bstart;
- struct au_dinfo *dinfo;
- struct super_block *sb;
- struct dentry *parent;
-
- DiMustWriteLock(dentry);
-
- sb = dentry->d_sb;
- AuDebugOn(IS_ROOT(dentry));
- sigen = au_sigen(sb);
- parent = dget_parent(dentry);
- AuDebugOn(au_digen(parent) != sigen
- || au_iigen(parent->d_inode) != sigen);
-
- dinfo = au_di(dentry);
- err = au_di_realloc(dinfo, au_sbend(sb) + 1);
- npositive = err;
- if (unlikely(err))
- goto out;
- au_do_refresh_hdentry(dinfo->di_hdentry + dinfo->di_bstart, dinfo,
- parent);
-
- npositive = 0;
- bstart = au_dbstart(parent);
- if (type != S_IFDIR && dinfo->di_bstart == bstart)
- goto out_dgen; /* success */
-
- npositive = au_lkup_dentry(dentry, bstart, type, /*nd*/NULL);
- if (npositive < 0)
- goto out;
- if (dinfo->di_bwh >= 0 && dinfo->di_bwh <= dinfo->di_bstart)
- d_drop(dentry);
-
- out_dgen:
- au_update_digen(dentry);
- out:
- dput(parent);
- AuTraceErr(npositive);
- return npositive;
-}
-
-static noinline_for_stack
-int au_do_h_d_reval(struct dentry *h_dentry, struct nameidata *nd,
- struct dentry *dentry, aufs_bindex_t bindex)
-{
- int err, valid;
- int (*reval)(struct dentry *, struct nameidata *);
-
- err = 0;
- reval = NULL;
- if (h_dentry->d_op)
- reval = h_dentry->d_op->d_revalidate;
- if (!reval)
- goto out;
-
- AuDbg("b%d\n", bindex);
- if (au_test_fs_null_nd(h_dentry->d_sb))
- /* it may return tri-state */
- valid = reval(h_dentry, NULL);
- else {
- struct nameidata h_nd;
- int locked;
- struct dentry *parent;
-
- au_h_nd(&h_nd, nd);
- parent = nd->path.dentry;
- locked = (nd && nd->path.dentry != dentry);
- if (locked)
- di_read_lock_parent(parent, AuLock_IR);
- BUG_ON(bindex > au_dbend(parent));
- h_nd.path.dentry = au_h_dptr(parent, bindex);
- BUG_ON(!h_nd.path.dentry);
- h_nd.path.mnt = au_sbr(parent->d_sb, bindex)->br_mnt;
- path_get(&h_nd.path);
- valid = reval(h_dentry, &h_nd);
- path_put(&h_nd.path);
- if (locked)
- di_read_unlock(parent, AuLock_IR);
- }
-
- if (unlikely(valid < 0))
- err = valid;
- else if (!valid)
- err = -EINVAL;
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-/* todo: remove this */
-static int h_d_revalidate(struct dentry *dentry, struct inode *inode,
- struct nameidata *nd, int do_udba)
-{
- int err;
- umode_t mode, h_mode;
- aufs_bindex_t bindex, btail, bstart, ibs, ibe;
- unsigned char plus, unhashed, is_root, h_plus;
- struct inode *h_inode, *h_cached_inode;
- struct dentry *h_dentry;
- struct qstr *name, *h_name;
-
- err = 0;
- plus = 0;
- mode = 0;
- ibs = -1;
- ibe = -1;
- unhashed = !!d_unhashed(dentry);
- is_root = !!IS_ROOT(dentry);
- name = &dentry->d_name;
-
- /*
- * Theoretically, REVAL test should be unnecessary in case of INOTIFY.
- * But inotify doesn't fire some necessary events,
- * IN_ATTRIB for atime/nlink/pageio
- * IN_DELETE for NFS dentry
- * Let's do REVAL test too.
- */
- if (do_udba && inode) {
- mode = (inode->i_mode & S_IFMT);
- plus = (inode->i_nlink > 0);
- ibs = au_ibstart(inode);
- ibe = au_ibend(inode);
- }
-
- bstart = au_dbstart(dentry);
- btail = bstart;
- if (inode && S_ISDIR(inode->i_mode))
- btail = au_dbtaildir(dentry);
- for (bindex = bstart; bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
-
- AuDbg("b%d, %.*s\n", bindex, AuDLNPair(h_dentry));
- h_name = &h_dentry->d_name;
- if (unlikely(do_udba
- && !is_root
- && (unhashed != !!d_unhashed(h_dentry)
- || name->len != h_name->len
- || memcmp(name->name, h_name->name, name->len))
- )) {
- AuDbg("unhash 0x%x 0x%x, %.*s %.*s\n",
- unhashed, d_unhashed(h_dentry),
- AuDLNPair(dentry), AuDLNPair(h_dentry));
- goto err;
- }
-
- err = au_do_h_d_reval(h_dentry, nd, dentry, bindex);
- if (unlikely(err))
- /* do not goto err, to keep the errno */
- break;
-
- /* todo: plink too? */
- if (!do_udba)
- continue;
-
- /* UDBA tests */
- h_inode = h_dentry->d_inode;
- if (unlikely(!!inode != !!h_inode))
- goto err;
-
- h_plus = plus;
- h_mode = mode;
- h_cached_inode = h_inode;
- if (h_inode) {
- h_mode = (h_inode->i_mode & S_IFMT);
- h_plus = (h_inode->i_nlink > 0);
- }
- if (inode && ibs <= bindex && bindex <= ibe)
- h_cached_inode = au_h_iptr(inode, bindex);
-
- if (unlikely(plus != h_plus
- || mode != h_mode
- || h_cached_inode != h_inode))
- goto err;
- continue;
-
- err:
- err = -EINVAL;
- break;
- }
-
- return err;
-}
-
-static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen)
-{
- int err;
- struct dentry *parent;
- struct inode *inode;
-
- inode = dentry->d_inode;
- if (au_digen(dentry) == sigen && au_iigen(inode) == sigen)
- return 0;
-
- parent = dget_parent(dentry);
- di_read_lock_parent(parent, AuLock_IR);
- AuDebugOn(au_digen(parent) != sigen
- || au_iigen(parent->d_inode) != sigen);
- au_dbg_verify_gen(parent, sigen);
-
- /* returns a number of positive dentries */
- err = au_refresh_hdentry(dentry, inode->i_mode & S_IFMT);
- if (err >= 0)
- err = au_refresh_hinode(inode, dentry);
-
- di_read_unlock(parent, AuLock_IR);
- dput(parent);
- return err;
-}
-
-int au_reval_dpath(struct dentry *dentry, unsigned int sigen)
-{
- int err;
- struct dentry *d, *parent;
- struct inode *inode;
-
- if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIRS))
- return simple_reval_dpath(dentry, sigen);
-
- /* slow loop, keep it simple and stupid */
- /* cf: au_cpup_dirs() */
- err = 0;
- parent = NULL;
- while (au_digen(dentry) != sigen
- || au_iigen(dentry->d_inode) != sigen) {
- d = dentry;
- while (1) {
- dput(parent);
- parent = dget_parent(d);
- if (au_digen(parent) == sigen
- && au_iigen(parent->d_inode) == sigen)
- break;
- d = parent;
- }
-
- inode = d->d_inode;
- if (d != dentry)
- di_write_lock_child(d);
-
- /* someone might update our dentry while we were sleeping */
- if (au_digen(d) != sigen || au_iigen(d->d_inode) != sigen) {
- di_read_lock_parent(parent, AuLock_IR);
- /* returns a number of positive dentries */
- err = au_refresh_hdentry(d, inode->i_mode & S_IFMT);
- if (err >= 0)
- err = au_refresh_hinode(inode, d);
- di_read_unlock(parent, AuLock_IR);
- }
-
- if (d != dentry)
- di_write_unlock(d);
- dput(parent);
- if (unlikely(err))
- break;
- }
-
- return err;
-}
-
-/*
- * if valid returns 1, otherwise 0.
- */
-static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
-{
- int valid, err;
- unsigned int sigen;
- unsigned char do_udba;
- struct super_block *sb;
- struct inode *inode;
-
- err = -EINVAL;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW);
- sigen = au_sigen(sb);
- if (au_digen(dentry) != sigen) {
- AuDebugOn(IS_ROOT(dentry));
- if (inode)
- err = au_reval_dpath(dentry, sigen);
- if (unlikely(err))
- goto out_dgrade;
- }
- if (inode && au_iigen(inode) != sigen) {
- AuDebugOn(IS_ROOT(dentry));
- err = au_refresh_hinode(inode, dentry);
- if (unlikely(err))
- goto out_dgrade;
- }
- di_downgrade_lock(dentry, AuLock_IR);
-
- err = -EINVAL;
- do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
- if (do_udba && inode) {
- aufs_bindex_t bstart = au_ibstart(inode);
-
- if (bstart >= 0
- && au_test_higen(inode, au_h_iptr(inode, bstart)))
- goto out;
- }
-
- err = h_d_revalidate(dentry, inode, nd, do_udba);
- if (unlikely(!err && do_udba && au_dbstart(dentry) < 0))
- /* both of real entry and whiteout found */
- err = -EIO;
- goto out;
-
- out_dgrade:
- di_downgrade_lock(dentry, AuLock_IR);
- out:
- aufs_read_unlock(dentry, AuLock_IR);
- AuTraceErr(err);
- valid = !err;
- if (!valid)
- AuDbg("%.*s invalid\n", AuDLNPair(dentry));
- return valid;
-}
-
-static void aufs_d_release(struct dentry *dentry)
-{
- if (dentry->d_fsdata) {
- au_di_fin(dentry);
- au_hn_di_reinit(dentry);
- }
-}
-
-const struct dentry_operations aufs_dop = {
- .d_revalidate = aufs_d_revalidate,
- .d_release = aufs_d_release
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * lookup and dentry operations
- */
-
-#ifndef __AUFS_DENTRY_H__
-#define __AUFS_DENTRY_H__
-
-#ifdef __KERNEL__
-
-#include <linux/dcache.h>
-#include <linux/aufs_type.h>
-#include "rwsem.h"
-
-/* make a single member structure for future use */
-/* todo: remove this structure */
-struct au_hdentry {
- struct dentry *hd_dentry;
-};
-
-struct au_dinfo {
- atomic_t di_generation;
-
- struct au_rwsem di_rwsem;
- aufs_bindex_t di_bstart, di_bend, di_bwh, di_bdiropq;
- struct au_hdentry *di_hdentry;
-} ____cacheline_aligned_in_smp;
-
-/* ---------------------------------------------------------------------- */
-
-/* dentry.c */
-extern const struct dentry_operations aufs_dop;
-struct au_branch;
-struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent,
- struct au_branch *br, struct nameidata *nd);
-struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent,
- struct au_branch *br);
-int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
- struct dentry *h_parent, struct au_branch *br);
-
-int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type,
- struct nameidata *nd);
-int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex);
-int au_refresh_hdentry(struct dentry *dentry, mode_t type);
-int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
-
-/* dinfo.c */
-void au_di_init_once(void *_di);
-int au_di_init(struct dentry *dentry);
-void au_di_fin(struct dentry *dentry);
-int au_di_realloc(struct au_dinfo *dinfo, int nbr);
-
-void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
-void di_read_unlock(struct dentry *d, int flags);
-void di_downgrade_lock(struct dentry *d, int flags);
-void di_write_lock(struct dentry *d, unsigned int lsc);
-void di_write_unlock(struct dentry *d);
-void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
-void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
-void di_write_unlock2(struct dentry *d1, struct dentry *d2);
-
-struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
-aufs_bindex_t au_dbtail(struct dentry *dentry);
-aufs_bindex_t au_dbtaildir(struct dentry *dentry);
-
-void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_dentry);
-void au_update_digen(struct dentry *dentry);
-void au_update_dbrange(struct dentry *dentry, int do_put_zero);
-void au_update_dbstart(struct dentry *dentry);
-void au_update_dbend(struct dentry *dentry);
-int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_dinfo *au_di(struct dentry *dentry)
-{
- return dentry->d_fsdata;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* lock subclass for dinfo */
-enum {
- AuLsc_DI_CHILD, /* child first */
- AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */
- AuLsc_DI_CHILD3, /* copyup dirs */
- AuLsc_DI_PARENT,
- AuLsc_DI_PARENT2,
- AuLsc_DI_PARENT3
-};
-
-/*
- * di_read_lock_child, di_write_lock_child,
- * di_read_lock_child2, di_write_lock_child2,
- * di_read_lock_child3, di_write_lock_child3,
- * di_read_lock_parent, di_write_lock_parent,
- * di_read_lock_parent2, di_write_lock_parent2,
- * di_read_lock_parent3, di_write_lock_parent3,
- */
-#define AuReadLockFunc(name, lsc) \
-static inline void di_read_lock_##name(struct dentry *d, int flags) \
-{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
-
-#define AuWriteLockFunc(name, lsc) \
-static inline void di_write_lock_##name(struct dentry *d) \
-{ di_write_lock(d, AuLsc_DI_##lsc); }
-
-#define AuRWLockFuncs(name, lsc) \
- AuReadLockFunc(name, lsc) \
- AuWriteLockFunc(name, lsc)
-
-AuRWLockFuncs(child, CHILD);
-AuRWLockFuncs(child2, CHILD2);
-AuRWLockFuncs(child3, CHILD3);
-AuRWLockFuncs(parent, PARENT);
-AuRWLockFuncs(parent2, PARENT2);
-AuRWLockFuncs(parent3, PARENT3);
-
-#undef AuReadLockFunc
-#undef AuWriteLockFunc
-#undef AuRWLockFuncs
-
-#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem)
-#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem)
-#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: memory barrier? */
-static inline unsigned int au_digen(struct dentry *d)
-{
- return atomic_read(&au_di(d)->di_generation);
-}
-
-static inline void au_h_dentry_init(struct au_hdentry *hdentry)
-{
- hdentry->hd_dentry = NULL;
-}
-
-static inline void au_hdput(struct au_hdentry *hd)
-{
- if (hd)
- dput(hd->hd_dentry);
-}
-
-static inline aufs_bindex_t au_dbstart(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bstart;
-}
-
-static inline aufs_bindex_t au_dbend(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bend;
-}
-
-static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bwh;
-}
-
-static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bdiropq;
-}
-
-/* todo: hard/soft set? */
-static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- au_di(dentry)->di_bstart = bindex;
-}
-
-static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- au_di(dentry)->di_bend = bindex;
-}
-
-static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- /* dbwh can be outside of bstart - bend range */
- au_di(dentry)->di_bwh = bindex;
-}
-
-static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- au_di(dentry)->di_bdiropq = bindex;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_HNOTIFY
-static inline void au_digen_dec(struct dentry *d)
-{
- atomic_dec_return(&au_di(d)->di_generation);
-}
-
-static inline void au_hn_di_reinit(struct dentry *dentry)
-{
- dentry->d_fsdata = NULL;
-}
-#else
-AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused)
-#endif /* CONFIG_AUFS_HNOTIFY */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DENTRY_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * dentry private data
- */
-
-#include "aufs.h"
-
-void au_di_init_once(void *_di)
-{
- struct au_dinfo *di = _di;
-
- au_rw_init(&di->di_rwsem);
-}
-
-int au_di_init(struct dentry *dentry)
-{
- struct au_dinfo *dinfo;
- struct super_block *sb;
- int nbr;
-
- dinfo = au_cache_alloc_dinfo();
- if (unlikely(!dinfo))
- goto out;
-
- sb = dentry->d_sb;
- nbr = au_sbend(sb) + 1;
- if (nbr <= 0)
- nbr = 1;
- dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS);
- if (unlikely(!dinfo->di_hdentry))
- goto out_dinfo;
-
- atomic_set(&dinfo->di_generation, au_sigen(sb));
- /* smp_mb(); */ /* atomic_set */
- au_rw_write_lock_nested(&dinfo->di_rwsem, AuLsc_DI_CHILD);
- dinfo->di_bstart = -1;
- dinfo->di_bend = -1;
- dinfo->di_bwh = -1;
- dinfo->di_bdiropq = -1;
-
- dentry->d_fsdata = dinfo;
- dentry->d_op = &aufs_dop;
- return 0; /* success */
-
- out_dinfo:
- au_cache_free_dinfo(dinfo);
- out:
- return -ENOMEM;
-}
-
-void au_di_fin(struct dentry *dentry)
-{
- struct au_dinfo *di;
- struct au_hdentry *p;
- aufs_bindex_t bend, bindex;
-
- /* dentry may not be revalidated */
- di = dentry->d_fsdata;
- bindex = di->di_bstart;
- if (bindex >= 0) {
- bend = di->di_bend;
- p = di->di_hdentry + bindex;
- while (bindex++ <= bend)
- au_hdput(p++);
- }
- kfree(di->di_hdentry);
- AuRwDestroy(&di->di_rwsem);
- au_cache_free_dinfo(di);
-}
-
-int au_di_realloc(struct au_dinfo *dinfo, int nbr)
-{
- int err, sz;
- struct au_hdentry *hdp;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*hdp) * (dinfo->di_bend + 1);
- if (!sz)
- sz = sizeof(*hdp);
- hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS);
- if (hdp) {
- dinfo->di_hdentry = hdp;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
-{
- switch (lsc) {
- case AuLsc_DI_CHILD:
- ii_write_lock_child(inode);
- break;
- case AuLsc_DI_CHILD2:
- ii_write_lock_child2(inode);
- break;
- case AuLsc_DI_CHILD3:
- ii_write_lock_child3(inode);
- break;
- case AuLsc_DI_PARENT:
- ii_write_lock_parent(inode);
- break;
- case AuLsc_DI_PARENT2:
- ii_write_lock_parent2(inode);
- break;
- case AuLsc_DI_PARENT3:
- ii_write_lock_parent3(inode);
- break;
- default:
- BUG();
- }
-}
-
-static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
-{
- switch (lsc) {
- case AuLsc_DI_CHILD:
- ii_read_lock_child(inode);
- break;
- case AuLsc_DI_CHILD2:
- ii_read_lock_child2(inode);
- break;
- case AuLsc_DI_CHILD3:
- ii_read_lock_child3(inode);
- break;
- case AuLsc_DI_PARENT:
- ii_read_lock_parent(inode);
- break;
- case AuLsc_DI_PARENT2:
- ii_read_lock_parent2(inode);
- break;
- case AuLsc_DI_PARENT3:
- ii_read_lock_parent3(inode);
- break;
- default:
- BUG();
- }
-}
-
-void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
-{
- au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc);
- if (d->d_inode) {
- if (au_ftest_lock(flags, IW))
- do_ii_write_lock(d->d_inode, lsc);
- else if (au_ftest_lock(flags, IR))
- do_ii_read_lock(d->d_inode, lsc);
- }
-}
-
-void di_read_unlock(struct dentry *d, int flags)
-{
- if (d->d_inode) {
- if (au_ftest_lock(flags, IW))
- ii_write_unlock(d->d_inode);
- else if (au_ftest_lock(flags, IR))
- ii_read_unlock(d->d_inode);
- }
- au_rw_read_unlock(&au_di(d)->di_rwsem);
-}
-
-void di_downgrade_lock(struct dentry *d, int flags)
-{
- if (d->d_inode && au_ftest_lock(flags, IR))
- ii_downgrade_lock(d->d_inode);
- au_rw_dgrade_lock(&au_di(d)->di_rwsem);
-}
-
-void di_write_lock(struct dentry *d, unsigned int lsc)
-{
- au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc);
- if (d->d_inode)
- do_ii_write_lock(d->d_inode, lsc);
-}
-
-void di_write_unlock(struct dentry *d)
-{
- if (d->d_inode)
- ii_write_unlock(d->d_inode);
- au_rw_write_unlock(&au_di(d)->di_rwsem);
-}
-
-void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
-{
- AuDebugOn(d1 == d2
- || d1->d_inode == d2->d_inode
- || d1->d_sb != d2->d_sb);
-
- if (isdir && au_test_subdir(d1, d2)) {
- di_write_lock_child(d1);
- di_write_lock_child2(d2);
- } else {
- /* there should be no races */
- di_write_lock_child(d2);
- di_write_lock_child2(d1);
- }
-}
-
-void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
-{
- AuDebugOn(d1 == d2
- || d1->d_inode == d2->d_inode
- || d1->d_sb != d2->d_sb);
-
- if (isdir && au_test_subdir(d1, d2)) {
- di_write_lock_parent(d1);
- di_write_lock_parent2(d2);
- } else {
- /* there should be no races */
- di_write_lock_parent(d2);
- di_write_lock_parent2(d1);
- }
-}
-
-void di_write_unlock2(struct dentry *d1, struct dentry *d2)
-{
- di_write_unlock(d1);
- if (d1->d_inode == d2->d_inode)
- au_rw_write_unlock(&au_di(d2)->di_rwsem);
- else
- di_write_unlock(d2);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex)
-{
- struct dentry *d;
-
- DiMustAnyLock(dentry);
-
- if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
- return NULL;
- AuDebugOn(bindex < 0);
- d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry;
- AuDebugOn(d && (atomic_read(&d->d_count) <= 0));
- return d;
-}
-
-aufs_bindex_t au_dbtail(struct dentry *dentry)
-{
- aufs_bindex_t bend, bwh;
-
- bend = au_dbend(dentry);
- if (0 <= bend) {
- bwh = au_dbwh(dentry);
- if (!bwh)
- return bwh;
- if (0 < bwh && bwh < bend)
- return bwh - 1;
- }
- return bend;
-}
-
-aufs_bindex_t au_dbtaildir(struct dentry *dentry)
-{
- aufs_bindex_t bend, bopq;
-
- bend = au_dbtail(dentry);
- if (0 <= bend) {
- bopq = au_dbdiropq(dentry);
- if (0 <= bopq && bopq < bend)
- bend = bopq;
- }
- return bend;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_dentry)
-{
- struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
-
- DiMustWriteLock(dentry);
-
- au_hdput(hd);
- hd->hd_dentry = h_dentry;
-}
-
-void au_update_digen(struct dentry *dentry)
-{
- atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb));
- /* smp_mb(); */ /* atomic_set */
-}
-
-void au_update_dbrange(struct dentry *dentry, int do_put_zero)
-{
- struct au_dinfo *dinfo;
- struct dentry *h_d;
- struct au_hdentry *hdp;
-
- DiMustWriteLock(dentry);
-
- dinfo = au_di(dentry);
- if (!dinfo || dinfo->di_bstart < 0)
- return;
-
- hdp = dinfo->di_hdentry;
- if (do_put_zero) {
- aufs_bindex_t bindex, bend;
-
- bend = dinfo->di_bend;
- for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) {
- h_d = hdp[0 + bindex].hd_dentry;
- if (h_d && !h_d->d_inode)
- au_set_h_dptr(dentry, bindex, NULL);
- }
- }
-
- dinfo->di_bstart = -1;
- while (++dinfo->di_bstart <= dinfo->di_bend)
- if (hdp[0 + dinfo->di_bstart].hd_dentry)
- break;
- if (dinfo->di_bstart > dinfo->di_bend) {
- dinfo->di_bstart = -1;
- dinfo->di_bend = -1;
- return;
- }
-
- dinfo->di_bend++;
- while (0 <= --dinfo->di_bend)
- if (hdp[0 + dinfo->di_bend].hd_dentry)
- break;
- AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0);
-}
-
-void au_update_dbstart(struct dentry *dentry)
-{
- aufs_bindex_t bindex, bend;
- struct dentry *h_dentry;
-
- bend = au_dbend(dentry);
- for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- if (h_dentry->d_inode) {
- au_set_dbstart(dentry, bindex);
- return;
- }
- au_set_h_dptr(dentry, bindex, NULL);
- }
-}
-
-void au_update_dbend(struct dentry *dentry)
-{
- aufs_bindex_t bindex, bstart;
- struct dentry *h_dentry;
-
- bstart = au_dbstart(dentry);
- for (bindex = au_dbend(dentry); bindex <= bstart; bindex--) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- if (h_dentry->d_inode) {
- au_set_dbend(dentry, bindex);
- return;
- }
- au_set_h_dptr(dentry, bindex, NULL);
- }
-}
-
-int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
-{
- aufs_bindex_t bindex, bend;
-
- bend = au_dbend(dentry);
- for (bindex = au_dbstart(dentry); bindex <= bend; bindex++)
- if (au_h_dptr(dentry, bindex) == h_dentry)
- return bindex;
- return -1;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * directory operations
- */
-
-#include <linux/file.h>
-#include <linux/fs_stack.h>
-#include "aufs.h"
-
-void au_add_nlink(struct inode *dir, struct inode *h_dir)
-{
- AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
-
- dir->i_nlink += h_dir->i_nlink - 2;
- if (h_dir->i_nlink < 2)
- dir->i_nlink += 2;
-}
-
-void au_sub_nlink(struct inode *dir, struct inode *h_dir)
-{
- AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
-
- dir->i_nlink -= h_dir->i_nlink - 2;
- if (h_dir->i_nlink < 2)
- dir->i_nlink -= 2;
-}
-
-loff_t au_dir_size(struct file *file, struct dentry *dentry)
-{
- loff_t sz;
- aufs_bindex_t bindex, bend;
- struct file *h_file;
- struct dentry *h_dentry;
-
- sz = 0;
- if (file) {
- AuDebugOn(!file->f_dentry);
- AuDebugOn(!file->f_dentry->d_inode);
- AuDebugOn(!S_ISDIR(file->f_dentry->d_inode->i_mode));
-
- bend = au_fbend_dir(file);
- for (bindex = au_fbstart(file);
- bindex <= bend && sz < KMALLOC_MAX_SIZE;
- bindex++) {
- h_file = au_hf_dir(file, bindex);
- if (h_file
- && h_file->f_dentry
- && h_file->f_dentry->d_inode)
- sz += i_size_read(h_file->f_dentry->d_inode);
- }
- } else {
- AuDebugOn(!dentry);
- AuDebugOn(!dentry->d_inode);
- AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode));
-
- bend = au_dbtaildir(dentry);
- for (bindex = au_dbstart(dentry);
- bindex <= bend && sz < KMALLOC_MAX_SIZE;
- bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && h_dentry->d_inode)
- sz += i_size_read(h_dentry->d_inode);
- }
- }
- if (sz < KMALLOC_MAX_SIZE)
- sz = roundup_pow_of_two(sz);
- if (sz > KMALLOC_MAX_SIZE)
- sz = KMALLOC_MAX_SIZE;
- else if (sz < NAME_MAX) {
- BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
- sz = AUFS_RDBLK_DEF;
- }
- return sz;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int reopen_dir(struct file *file)
-{
- int err;
- unsigned int flags;
- aufs_bindex_t bindex, btail, bstart;
- struct dentry *dentry, *h_dentry;
- struct file *h_file;
-
- /* open all lower dirs */
- dentry = file->f_dentry;
- bstart = au_dbstart(dentry);
- for (bindex = au_fbstart(file); bindex < bstart; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- au_set_fbstart(file, bstart);
-
- btail = au_dbtaildir(dentry);
- for (bindex = au_fbend_dir(file); btail < bindex; bindex--)
- au_set_h_fptr(file, bindex, NULL);
- au_set_fbend_dir(file, btail);
-
- flags = vfsub_file_flags(file);
- for (bindex = bstart; bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- h_file = au_hf_dir(file, bindex);
- if (h_file)
- continue;
-
- h_file = au_h_open(dentry, bindex, flags, file);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out; /* close all? */
- au_set_h_fptr(file, bindex, h_file);
- }
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- err = 0;
-
- out:
- return err;
-}
-
-static int do_open_dir(struct file *file, int flags)
-{
- int err;
- aufs_bindex_t bindex, btail;
- struct dentry *dentry, *h_dentry;
- struct file *h_file;
-
- FiMustWriteLock(file);
-
- err = 0;
- dentry = file->f_dentry;
- file->f_version = dentry->d_inode->i_version;
- bindex = au_dbstart(dentry);
- au_set_fbstart(file, bindex);
- btail = au_dbtaildir(dentry);
- au_set_fbend_dir(file, btail);
- for (; !err && bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
-
- h_file = au_h_open(dentry, bindex, flags, file);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- break;
- }
- au_set_h_fptr(file, bindex, h_file);
- }
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- if (!err)
- return 0; /* success */
-
- /* close all */
- for (bindex = au_fbstart(file); bindex <= btail; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- au_set_fbstart(file, -1);
- au_set_fbend_dir(file, -1);
-
- return err;
-}
-
-static int aufs_open_dir(struct inode *inode __maybe_unused,
- struct file *file)
-{
- int err;
- struct super_block *sb;
- struct au_fidir *fidir;
-
- err = -ENOMEM;
- sb = file->f_dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- fidir = au_fidir_alloc(inode->i_sb);
- if (fidir) {
- err = au_do_open(file, do_open_dir, fidir);
- if (unlikely(err))
- kfree(fidir);
- }
- si_read_unlock(sb);
- return err;
-}
-
-static int aufs_release_dir(struct inode *inode __maybe_unused,
- struct file *file)
-{
- struct au_vdir *vdir_cache;
- struct super_block *sb;
- struct au_finfo *finfo;
- struct au_fidir *fidir;
- aufs_bindex_t bindex, bend;
-
- au_plink_maint_leave(file);
- sb = file->f_dentry->d_sb;
- finfo = au_fi(file);
- fidir = finfo->fi_hdir;
- if (fidir) {
- vdir_cache = fidir->fd_vdir_cache; /* lock-free */
- if (vdir_cache)
- au_vdir_free(vdir_cache);
-
- bindex = finfo->fi_btop;
- if (bindex >= 0) {
- /*
- * calls fput() instead of filp_close(),
- * since no dnotify or lock for the lower file.
- */
- bend = fidir->fd_bbot;
- for (; bindex <= bend; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- }
- kfree(fidir);
- finfo->fi_hdir = NULL;
- }
- au_finfo_fin(file);
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_flush_dir(struct file *file, fl_owner_t id)
-{
- int err;
- aufs_bindex_t bindex, bend;
- struct file *h_file;
-
- err = 0;
- bend = au_fbend_dir(file);
- for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
- h_file = au_hf_dir(file, bindex);
- if (h_file)
- err = vfsub_flush(h_file, id);
- }
- return err;
-}
-
-static int aufs_flush_dir(struct file *file, fl_owner_t id)
-{
- return au_do_flush(file, id, au_do_flush_dir);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync)
-{
- int err;
- aufs_bindex_t bend, bindex;
- struct inode *inode;
- struct super_block *sb;
-
- err = 0;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- IMustLock(inode);
- bend = au_dbend(dentry);
- for (bindex = au_dbstart(dentry); !err && bindex <= bend; bindex++) {
- struct path h_path;
- struct inode *h_inode;
-
- if (au_test_ro(sb, bindex, inode))
- continue;
- h_path.dentry = au_h_dptr(dentry, bindex);
- if (!h_path.dentry)
- continue;
- h_inode = h_path.dentry->d_inode;
- if (!h_inode)
- continue;
-
- /* no mnt_want_write() */
- /* cf. fs/nsfd/vfs.c and fs/nfsd/nfs4recover.c */
- /* todo: inotiry fired? */
- h_path.mnt = au_sbr_mnt(sb, bindex);
- mutex_lock(&h_inode->i_mutex);
- err = filemap_fdatawrite(h_inode->i_mapping);
- AuDebugOn(!h_inode->i_fop);
- if (!err && h_inode->i_fop->fsync)
- err = h_inode->i_fop->fsync(NULL, h_path.dentry,
- datasync);
- if (!err)
- err = filemap_fdatawrite(h_inode->i_mapping);
- if (!err)
- vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
- mutex_unlock(&h_inode->i_mutex);
- }
-
- return err;
-}
-
-static int au_do_fsync_dir(struct file *file, int datasync)
-{
- int err;
- aufs_bindex_t bend, bindex;
- struct file *h_file;
- struct super_block *sb;
- struct inode *inode;
- struct mutex *h_mtx;
-
- err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- sb = file->f_dentry->d_sb;
- inode = file->f_dentry->d_inode;
- bend = au_fbend_dir(file);
- for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
- h_file = au_hf_dir(file, bindex);
- if (!h_file || au_test_ro(sb, bindex, inode))
- continue;
-
- err = vfs_fsync(h_file, h_file->f_dentry, datasync);
- if (!err) {
- h_mtx = &h_file->f_dentry->d_inode->i_mutex;
- mutex_lock(h_mtx);
- vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
- /*ignore*/
- mutex_unlock(h_mtx);
- }
- }
-
- out:
- return err;
-}
-
-/*
- * @file may be NULL
- */
-static int aufs_fsync_dir(struct file *file, struct dentry *dentry,
- int datasync)
-{
- int err;
- struct super_block *sb;
-
- IMustLock(dentry->d_inode);
-
- err = 0;
- sb = dentry->d_sb;
- si_noflush_read_lock(sb);
- if (file)
- err = au_do_fsync_dir(file, datasync);
- else {
- di_write_lock_child(dentry);
- err = au_do_fsync_dir_no_file(dentry, datasync);
- }
- au_cpup_attr_timesizes(dentry->d_inode);
- di_write_unlock(dentry);
- if (file)
- fi_write_unlock(file);
-
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir)
-{
- int err;
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
-
- dentry = file->f_dentry;
- inode = dentry->d_inode;
- IMustLock(inode);
-
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
- if (unlikely(err))
- goto out;
- err = au_vdir_init(file);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
-
- if (!au_test_nfsd(current)) {
- err = au_vdir_fill_de(file, dirent, filldir);
- fsstack_copy_attr_atime(inode,
- au_h_iptr(inode, au_ibstart(inode)));
- } else {
- /*
- * nfsd filldir may call lookup_one_len(), vfs_getattr(),
- * encode_fh() and others.
- */
- struct inode *h_inode = au_h_iptr(inode, au_ibstart(inode));
-
- di_read_unlock(dentry, AuLock_IR);
- si_read_unlock(sb);
- /* lockdep_off(); */
- err = au_vdir_fill_de(file, dirent, filldir);
- /* lockdep_on(); */
- fsstack_copy_attr_atime(inode, h_inode);
- fi_write_unlock(file);
-
- AuTraceErr(err);
- return err;
- }
-
- out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- out:
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define AuTestEmpty_WHONLY 1
-#define AuTestEmpty_CALLED (1 << 1)
-#define AuTestEmpty_SHWH (1 << 2)
-#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name)
-#define au_fset_testempty(flags, name) { (flags) |= AuTestEmpty_##name; }
-#define au_fclr_testempty(flags, name) { (flags) &= ~AuTestEmpty_##name; }
-
-#ifndef CONFIG_AUFS_SHWH
-#undef AuTestEmpty_SHWH
-#define AuTestEmpty_SHWH 0
-#endif
-
-struct test_empty_arg {
- struct au_nhash *whlist;
- unsigned int flags;
- int err;
- aufs_bindex_t bindex;
-};
-
-static int test_empty_cb(void *__arg, const char *__name, int namelen,
- loff_t offset __maybe_unused, u64 ino,
- unsigned int d_type)
-{
- struct test_empty_arg *arg = __arg;
- char *name = (void *)__name;
-
- arg->err = 0;
- au_fset_testempty(arg->flags, CALLED);
- /* smp_mb(); */
- if (name[0] == '.'
- && (namelen == 1 || (name[1] == '.' && namelen == 2)))
- goto out; /* success */
-
- if (namelen <= AUFS_WH_PFX_LEN
- || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
- if (au_ftest_testempty(arg->flags, WHONLY)
- && !au_nhash_test_known_wh(arg->whlist, name, namelen))
- arg->err = -ENOTEMPTY;
- goto out;
- }
-
- name += AUFS_WH_PFX_LEN;
- namelen -= AUFS_WH_PFX_LEN;
- if (!au_nhash_test_known_wh(arg->whlist, name, namelen))
- arg->err = au_nhash_append_wh
- (arg->whlist, name, namelen, ino, d_type, arg->bindex,
- au_ftest_testempty(arg->flags, SHWH));
-
- out:
- /* smp_mb(); */
- AuTraceErr(arg->err);
- return arg->err;
-}
-
-static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
-{
- int err;
- struct file *h_file;
-
- h_file = au_h_open(dentry, arg->bindex,
- O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE,
- /*file*/NULL);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = 0;
- if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
- && !h_file->f_dentry->d_inode->i_nlink)
- goto out_put;
-
- do {
- arg->err = 0;
- au_fclr_testempty(arg->flags, CALLED);
- /* smp_mb(); */
- err = vfsub_readdir(h_file, test_empty_cb, arg);
- if (err >= 0)
- err = arg->err;
- } while (!err && au_ftest_testempty(arg->flags, CALLED));
-
- out_put:
- fput(h_file);
- au_sbr_put(dentry->d_sb, arg->bindex);
- out:
- return err;
-}
-
-struct do_test_empty_args {
- int *errp;
- struct dentry *dentry;
- struct test_empty_arg *arg;
-};
-
-static void call_do_test_empty(void *args)
-{
- struct do_test_empty_args *a = args;
- *a->errp = do_test_empty(a->dentry, a->arg);
-}
-
-static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
-{
- int err, wkq_err;
- struct dentry *h_dentry;
- struct inode *h_inode;
-
- h_dentry = au_h_dptr(dentry, arg->bindex);
- h_inode = h_dentry->d_inode;
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ);
- mutex_unlock(&h_inode->i_mutex);
- if (!err)
- err = do_test_empty(dentry, arg);
- else {
- struct do_test_empty_args args = {
- .errp = &err,
- .dentry = dentry,
- .arg = arg
- };
- unsigned int flags = arg->flags;
-
- wkq_err = au_wkq_wait(call_do_test_empty, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- arg->flags = flags;
- }
-
- return err;
-}
-
-int au_test_empty_lower(struct dentry *dentry)
-{
- int err;
- unsigned int rdhash;
- aufs_bindex_t bindex, bstart, btail;
- struct au_nhash whlist;
- struct test_empty_arg arg;
-
- SiMustAnyLock(dentry->d_sb);
-
- rdhash = au_sbi(dentry->d_sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry));
- err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
-
- arg.flags = 0;
- arg.whlist = &whlist;
- bstart = au_dbstart(dentry);
- if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
- au_fset_testempty(arg.flags, SHWH);
- arg.bindex = bstart;
- err = do_test_empty(dentry, &arg);
- if (unlikely(err))
- goto out_whlist;
-
- au_fset_testempty(arg.flags, WHONLY);
- btail = au_dbtaildir(dentry);
- for (bindex = bstart + 1; !err && bindex <= btail; bindex++) {
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && h_dentry->d_inode) {
- arg.bindex = bindex;
- err = do_test_empty(dentry, &arg);
- }
- }
-
- out_whlist:
- au_nhash_wh_free(&whlist);
- out:
- return err;
-}
-
-int au_test_empty(struct dentry *dentry, struct au_nhash *whlist)
-{
- int err;
- struct test_empty_arg arg;
- aufs_bindex_t bindex, btail;
-
- err = 0;
- arg.whlist = whlist;
- arg.flags = AuTestEmpty_WHONLY;
- if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
- au_fset_testempty(arg.flags, SHWH);
- btail = au_dbtaildir(dentry);
- for (bindex = au_dbstart(dentry); !err && bindex <= btail; bindex++) {
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && h_dentry->d_inode) {
- arg.bindex = bindex;
- err = sio_test_empty(dentry, &arg);
- }
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-const struct file_operations aufs_dir_fop = {
- .owner = THIS_MODULE,
- .read = generic_read_dir,
- .readdir = aufs_readdir,
- .unlocked_ioctl = aufs_ioctl_dir,
- .open = aufs_open_dir,
- .release = aufs_release_dir,
- .flush = aufs_flush_dir,
- .fsync = aufs_fsync_dir
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * directory operations
- */
-
-#ifndef __AUFS_DIR_H__
-#define __AUFS_DIR_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/aufs_type.h>
-
-/* ---------------------------------------------------------------------- */
-
-/* need to be faster and smaller */
-
-struct au_nhash {
- unsigned int nh_num;
- struct hlist_head *nh_head;
-};
-
-struct au_vdir_destr {
- unsigned char len;
- unsigned char name[0];
-} __packed;
-
-struct au_vdir_dehstr {
- struct hlist_node hash;
- struct au_vdir_destr *str;
-} ____cacheline_aligned_in_smp;
-
-struct au_vdir_de {
- ino_t de_ino;
- unsigned char de_type;
- /* caution: packed */
- struct au_vdir_destr de_str;
-} __packed;
-
-struct au_vdir_wh {
- struct hlist_node wh_hash;
-#ifdef CONFIG_AUFS_SHWH
- ino_t wh_ino;
- aufs_bindex_t wh_bindex;
- unsigned char wh_type;
-#else
- aufs_bindex_t wh_bindex;
-#endif
- /* caution: packed */
- struct au_vdir_destr wh_str;
-} __packed;
-
-union au_vdir_deblk_p {
- unsigned char *deblk;
- struct au_vdir_de *de;
-};
-
-struct au_vdir {
- unsigned char **vd_deblk;
- unsigned long vd_nblk;
- struct {
- unsigned long ul;
- union au_vdir_deblk_p p;
- } vd_last;
-
- unsigned long vd_version;
- unsigned int vd_deblk_sz;
- unsigned long vd_jiffy;
-} ____cacheline_aligned_in_smp;
-
-/* ---------------------------------------------------------------------- */
-
-/* dir.c */
-extern const struct file_operations aufs_dir_fop;
-void au_add_nlink(struct inode *dir, struct inode *h_dir);
-void au_sub_nlink(struct inode *dir, struct inode *h_dir);
-loff_t au_dir_size(struct file *file, struct dentry *dentry);
-int au_test_empty_lower(struct dentry *dentry);
-int au_test_empty(struct dentry *dentry, struct au_nhash *whlist);
-
-/* vdir.c */
-unsigned int au_rdhash_est(loff_t sz);
-int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
-void au_nhash_wh_free(struct au_nhash *whlist);
-int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
- int limit);
-int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen);
-int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
- unsigned int d_type, aufs_bindex_t bindex,
- unsigned char shwh);
-void au_vdir_free(struct au_vdir *vdir);
-int au_vdir_init(struct file *file);
-int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir);
-
-/* ioctl.c */
-long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);
-
-#ifdef CONFIG_AUFS_RDU
-/* rdu.c */
-long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
-#else
-static inline long au_rdu_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- return -EINVAL;
-}
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DIR_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * dynamically customizable operations for regular files
- */
-
-#include "aufs.h"
-
-#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop)
-
-/*
- * How large will these lists be?
- * Usually just a few elements, 20-30 at most for each, I guess.
- */
-static struct au_splhead dynop[AuDyLast];
-
-static struct au_dykey *dy_gfind_get(struct au_splhead *spl, const void *h_op)
-{
- struct au_dykey *key, *tmp;
- struct list_head *head;
-
- key = NULL;
- head = &spl->head;
- rcu_read_lock();
- list_for_each_entry_rcu(tmp, head, dk_list)
- if (tmp->dk_op.dy_hop == h_op) {
- key = tmp;
- kref_get(&key->dk_kref);
- break;
- }
- rcu_read_unlock();
-
- return key;
-}
-
-static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key)
-{
- struct au_dykey **k, *found;
- const void *h_op = key->dk_op.dy_hop;
- int i;
-
- found = NULL;
- k = br->br_dykey;
- for (i = 0; i < AuBrDynOp; i++)
- if (k[i]) {
- if (k[i]->dk_op.dy_hop == h_op) {
- found = k[i];
- break;
- }
- } else
- break;
- if (!found) {
- spin_lock(&br->br_dykey_lock);
- for (; i < AuBrDynOp; i++)
- if (k[i]) {
- if (k[i]->dk_op.dy_hop == h_op) {
- found = k[i];
- break;
- }
- } else {
- k[i] = key;
- break;
- }
- spin_unlock(&br->br_dykey_lock);
- BUG_ON(i == AuBrDynOp); /* expand the array */
- }
-
- return found;
-}
-
-/* kref_get() if @key is already added */
-static struct au_dykey *dy_gadd(struct au_splhead *spl, struct au_dykey *key)
-{
- struct au_dykey *tmp, *found;
- struct list_head *head;
- const void *h_op = key->dk_op.dy_hop;
-
- found = NULL;
- head = &spl->head;
- spin_lock(&spl->spin);
- list_for_each_entry(tmp, head, dk_list)
- if (tmp->dk_op.dy_hop == h_op) {
- kref_get(&tmp->dk_kref);
- found = tmp;
- break;
- }
- if (!found)
- list_add_rcu(&key->dk_list, head);
- spin_unlock(&spl->spin);
-
- if (!found)
- DyPrSym(key);
- return found;
-}
-
-static void dy_free_rcu(struct rcu_head *rcu)
-{
- struct au_dykey *key;
-
- key = container_of(rcu, struct au_dykey, dk_rcu);
- DyPrSym(key);
- kfree(key);
-}
-
-static void dy_free(struct kref *kref)
-{
- struct au_dykey *key;
- struct au_splhead *spl;
-
- key = container_of(kref, struct au_dykey, dk_kref);
- spl = dynop + key->dk_op.dy_type;
- au_spl_del_rcu(&key->dk_list, spl);
- call_rcu(&key->dk_rcu, dy_free_rcu);
-}
-
-void au_dy_put(struct au_dykey *key)
-{
- kref_put(&key->dk_kref, dy_free);
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *))
-
-#ifdef CONFIG_AUFS_DEBUG
-#define DyDbgDeclare(cnt) unsigned int cnt = 0
-#define DyDbgInc(cnt) cnt++
-#else
-#define DyDbgDeclare(cnt) do {} while (0)
-#define DyDbgInc(cnt) do {} while (0)
-#endif
-
-#define DySet(func, dst, src, h_op, h_sb) do { \
- DyDbgInc(cnt); \
- if (h_op->func) { \
- if (src.func) \
- dst.func = src.func; \
- else \
- AuDbg("%s %s\n", au_sbtype(h_sb), #func); \
- } \
-} while (0)
-
-#define DySetForce(func, dst, src) do { \
- AuDebugOn(!src.func); \
- DyDbgInc(cnt); \
- dst.func = src.func; \
-} while (0)
-
-#define DySetAop(func) \
- DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb)
-#define DySetAopForce(func) \
- DySetForce(func, dyaop->da_op, aufs_aop)
-
-static void dy_aop(struct au_dykey *key, const void *h_op,
- struct super_block *h_sb __maybe_unused)
-{
- struct au_dyaop *dyaop = (void *)key;
- const struct address_space_operations *h_aop = h_op;
- DyDbgDeclare(cnt);
-
- AuDbg("%s\n", au_sbtype(h_sb));
-
- DySetAop(writepage);
- DySetAopForce(readpage); /* force */
- DySetAop(sync_page);
- DySetAop(writepages);
- DySetAop(set_page_dirty);
- DySetAop(readpages);
- DySetAop(write_begin);
- DySetAop(write_end);
- DySetAop(bmap);
- DySetAop(invalidatepage);
- DySetAop(releasepage);
- /* these two will be changed according to an aufs mount option */
- DySetAop(direct_IO);
- DySetAop(get_xip_mem);
- DySetAop(migratepage);
- DySetAop(launder_page);
- DySetAop(is_partially_uptodate);
- DySetAop(error_remove_page);
-
- DyDbgSize(cnt, *h_aop);
- dyaop->da_get_xip_mem = h_aop->get_xip_mem;
-}
-
-#define DySetVmop(func) \
- DySet(func, dyvmop->dv_op, aufs_vm_ops, h_vmop, h_sb)
-#define DySetVmopForce(func) \
- DySetForce(func, dyvmop->dv_op, aufs_vm_ops)
-
-static void dy_vmop(struct au_dykey *key, const void *h_op,
- struct super_block *h_sb __maybe_unused)
-{
- struct au_dyvmop *dyvmop = (void *)key;
- const struct vm_operations_struct *h_vmop = h_op;
- DyDbgDeclare(cnt);
-
- AuDbg("%s\n", au_sbtype(h_sb));
-
- DySetVmop(open);
- DySetVmop(close);
- DySetVmop(fault);
- DySetVmop(page_mkwrite);
- DySetVmop(access);
-#ifdef CONFIG_NUMA
- DySetVmop(set_policy);
- DySetVmop(get_policy);
- DySetVmop(migrate);
-#endif
-
- DyDbgSize(cnt, *h_vmop);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void dy_bug(struct kref *kref)
-{
- BUG();
-}
-
-static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br)
-{
- struct au_dykey *key, *old;
- struct au_splhead *spl;
- static const struct {
- unsigned int sz;
- void (*set_op)(struct au_dykey *key, const void *h_op,
- struct super_block *h_sb __maybe_unused);
- } a[] = {
- [AuDy_AOP] = {
- .sz = sizeof(struct au_dyaop),
- .set_op = dy_aop
- },
- [AuDy_VMOP] = {
- .sz = sizeof(struct au_dyvmop),
- .set_op = dy_vmop
- }
- }, *p;
-
- spl = dynop + op->dy_type;
- key = dy_gfind_get(spl, op->dy_hop);
- if (key)
- goto out_add; /* success */
-
- p = a + op->dy_type;
- key = kzalloc(p->sz, GFP_NOFS);
- if (unlikely(!key)) {
- key = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- key->dk_op.dy_hop = op->dy_hop;
- kref_init(&key->dk_kref);
- p->set_op(key, op->dy_hop, br->br_mnt->mnt_sb);
- old = dy_gadd(spl, key);
- if (old) {
- kfree(key);
- key = old;
- }
-
-out_add:
- old = dy_bradd(br, key);
- if (old)
- /* its ref-count should never be zero here */
- kref_put(&key->dk_kref, dy_bug);
-out:
- return key;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * Aufs prohibits O_DIRECT by defaut even if the branch supports it.
- * This behaviour is neccessary to return an error from open(O_DIRECT) instead
- * of the succeeding I/O. The dio mount option enables O_DIRECT and makes
- * open(O_DIRECT) always succeed, but the succeeding I/O may return an error.
- * See the aufs manual in detail.
- *
- * To keep this behaviour, aufs has to set NULL to ->get_xip_mem too, and the
- * performance of fadvise() and madvise() may be affected.
- */
-static void dy_adx(struct au_dyaop *dyaop, int do_dx)
-{
- if (!do_dx) {
- dyaop->da_op.direct_IO = NULL;
- dyaop->da_op.get_xip_mem = NULL;
- } else {
- dyaop->da_op.direct_IO = aufs_aop.direct_IO;
- dyaop->da_op.get_xip_mem = aufs_aop.get_xip_mem;
- if (!dyaop->da_get_xip_mem)
- dyaop->da_op.get_xip_mem = NULL;
- }
-}
-
-static struct au_dyaop *dy_aget(struct au_branch *br,
- const struct address_space_operations *h_aop,
- int do_dx)
-{
- struct au_dyaop *dyaop;
- struct au_dynop op;
-
- op.dy_type = AuDy_AOP;
- op.dy_haop = h_aop;
- dyaop = (void *)dy_get(&op, br);
- if (IS_ERR(dyaop))
- goto out;
- dy_adx(dyaop, do_dx);
-
-out:
- return dyaop;
-}
-
-int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode)
-{
- int err, do_dx;
- struct super_block *sb;
- struct au_branch *br;
- struct au_dyaop *dyaop;
-
- AuDebugOn(!S_ISREG(h_inode->i_mode));
- IiMustWriteLock(inode);
-
- sb = inode->i_sb;
- br = au_sbr(sb, bindex);
- do_dx = !!au_opt_test(au_mntflags(sb), DIO);
- dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx);
- err = PTR_ERR(dyaop);
- if (IS_ERR(dyaop))
- /* unnecessary to call dy_fput() */
- goto out;
-
- err = 0;
- inode->i_mapping->a_ops = &dyaop->da_op;
-
-out:
- return err;
-}
-
-void au_dy_arefresh(int do_dx)
-{
- struct au_splhead *spl;
- struct list_head *head;
- struct au_dykey *key;
-
- spl = dynop + AuDy_AOP;
- head = &spl->head;
- spin_lock(&spl->spin);
- list_for_each_entry(key, head, dk_list)
- dy_adx((void *)key, do_dx);
- spin_unlock(&spl->spin);
-}
-
-const struct vm_operations_struct *
-au_dy_vmop(struct file *file, struct au_branch *br,
- const struct vm_operations_struct *h_vmop)
-{
- struct au_dyvmop *dyvmop;
- struct au_dynop op;
-
- op.dy_type = AuDy_VMOP;
- op.dy_hvmop = h_vmop;
- dyvmop = (void *)dy_get(&op, br);
- if (IS_ERR(dyvmop))
- return (void *)dyvmop;
- return &dyvmop->dv_op;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void __init au_dy_init(void)
-{
- int i;
-
- /* make sure that 'struct au_dykey *' can be any type */
- BUILD_BUG_ON(offsetof(struct au_dyaop, da_key));
- BUILD_BUG_ON(offsetof(struct au_dyvmop, dv_key));
-
- for (i = 0; i < AuDyLast; i++)
- au_spl_init(dynop + i);
-}
-
-void au_dy_fin(void)
-{
- int i;
-
- for (i = 0; i < AuDyLast; i++)
- WARN_ON(!list_empty(&dynop[i].head));
-}
+++ /dev/null
-/*
- * Copyright (C) 2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * dynamically customizable operations (for regular files only)
- */
-
-#ifndef __AUFS_DYNOP_H__
-#define __AUFS_DYNOP_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/mm.h>
-#include <linux/rcupdate.h>
-#include <linux/aufs_type.h>
-#include "inode.h"
-
-enum {AuDy_AOP, AuDy_VMOP, AuDyLast};
-
-struct au_dynop {
- int dy_type;
- union {
- const void *dy_hop;
- const struct address_space_operations *dy_haop;
- const struct vm_operations_struct *dy_hvmop;
- };
-};
-
-struct au_dykey {
- union {
- struct list_head dk_list;
- struct rcu_head dk_rcu;
- };
- struct au_dynop dk_op;
-
- /*
- * during I am in the branch local array, kref is gotten. when the
- * branch is removed, kref is put.
- */
- struct kref dk_kref;
-};
-
-/* stop unioning since their sizes are very different from each other */
-struct au_dyaop {
- struct au_dykey da_key;
- struct address_space_operations da_op; /* not const */
- int (*da_get_xip_mem)(struct address_space *, pgoff_t, int,
- void **, unsigned long *);
-};
-
-struct au_dyvmop {
- struct au_dykey dv_key;
- struct vm_operations_struct dv_op; /* not const */
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* dynop.c */
-struct au_branch;
-void au_dy_put(struct au_dykey *key);
-int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode);
-void au_dy_arefresh(int do_dio);
-const struct vm_operations_struct *
-au_dy_vmop(struct file *file, struct au_branch *br,
- const struct vm_operations_struct *h_vmop);
-
-void __init au_dy_init(void);
-void au_dy_fin(void);
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * Is it safe to replace a_ops during the inode/file is in operation?
- * Yes, I hope so.
- */
-static inline int au_dy_irefresh(struct inode *inode)
-{
- int err;
- aufs_bindex_t bstart;
- struct inode *h_inode;
-
- err = 0;
- if (S_ISREG(inode->i_mode)) {
- bstart = au_ibstart(inode);
- h_inode = au_h_iptr(inode, bstart);
- err = au_dy_iaop(inode, bstart, h_inode);
- }
- return err;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DYNOP_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * export via nfs
- */
-
-#include <linux/exportfs.h>
-#include <linux/file.h>
-#include <linux/mnt_namespace.h>
-#include <linux/namei.h>
-#include <linux/nsproxy.h>
-#include <linux/random.h>
-#include <linux/writeback.h>
-#include "aufs.h"
-
-union conv {
-#ifdef CONFIG_AUFS_INO_T_64
- __u32 a[2];
-#else
- __u32 a[1];
-#endif
- ino_t ino;
-};
-
-static ino_t decode_ino(__u32 *a)
-{
- union conv u;
-
- BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a));
- u.a[0] = a[0];
-#ifdef CONFIG_AUFS_INO_T_64
- u.a[1] = a[1];
-#endif
- return u.ino;
-}
-
-static void encode_ino(__u32 *a, ino_t ino)
-{
- union conv u;
-
- u.ino = ino;
- a[0] = u.a[0];
-#ifdef CONFIG_AUFS_INO_T_64
- a[1] = u.a[1];
-#endif
-}
-
-/* NFS file handle */
-enum {
- Fh_br_id,
- Fh_sigen,
-#ifdef CONFIG_AUFS_INO_T_64
- /* support 64bit inode number */
- Fh_ino1,
- Fh_ino2,
- Fh_dir_ino1,
- Fh_dir_ino2,
-#else
- Fh_ino1,
- Fh_dir_ino1,
-#endif
- Fh_igen,
- Fh_h_type,
- Fh_tail,
-
- Fh_ino = Fh_ino1,
- Fh_dir_ino = Fh_dir_ino1
-};
-
-static int au_test_anon(struct dentry *dentry)
-{
- return !!(dentry->d_flags & DCACHE_DISCONNECTED);
-}
-
-/* ---------------------------------------------------------------------- */
-/* inode generation external table */
-
-int au_xigen_inc(struct inode *inode)
-{
- int err;
- loff_t pos;
- ssize_t sz;
- __u32 igen;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
- err = 0;
- sb = inode->i_sb;
- sbinfo = au_sbi(sb);
- /*
- * temporary workaround for escaping from SiMustAnyLock() in
- * au_mntflags(), since this function is called from au_iinfo_fin().
- */
- if (unlikely(!au_opt_test(sbinfo->si_mntflags, XINO)))
- goto out;
-
- pos = inode->i_ino;
- pos *= sizeof(igen);
- igen = inode->i_generation + 1;
- sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
- sizeof(igen), &pos);
- if (sz == sizeof(igen))
- goto out; /* success */
-
- err = sz;
- if (unlikely(sz >= 0)) {
- err = -EIO;
- AuIOErr("xigen error (%zd)\n", sz);
- }
-
- out:
- return err;
-}
-
-int au_xigen_new(struct inode *inode)
-{
- int err;
- loff_t pos;
- ssize_t sz;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- err = 0;
- /* todo: dirty, at mount time */
- if (inode->i_ino == AUFS_ROOT_INO)
- goto out;
- sb = inode->i_sb;
- SiMustAnyLock(sb);
- if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
- goto out;
-
- err = -EFBIG;
- pos = inode->i_ino;
- if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) {
- AuIOErr1("too large i%lld\n", pos);
- goto out;
- }
- pos *= sizeof(inode->i_generation);
-
- err = 0;
- sbinfo = au_sbi(sb);
- file = sbinfo->si_xigen;
- BUG_ON(!file);
-
- if (i_size_read(file->f_dentry->d_inode)
- < pos + sizeof(inode->i_generation)) {
- inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next);
- sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation,
- sizeof(inode->i_generation), &pos);
- } else
- sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation,
- sizeof(inode->i_generation), &pos);
- if (sz == sizeof(inode->i_generation))
- goto out; /* success */
-
- err = sz;
- if (unlikely(sz >= 0)) {
- err = -EIO;
- AuIOErr("xigen error (%zd)\n", sz);
- }
-
- out:
- return err;
-}
-
-int au_xigen_set(struct super_block *sb, struct file *base)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- file = au_xino_create2(base, sbinfo->si_xigen);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- err = 0;
- if (sbinfo->si_xigen)
- fput(sbinfo->si_xigen);
- sbinfo->si_xigen = file;
-
- out:
- return err;
-}
-
-void au_xigen_clr(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- if (sbinfo->si_xigen) {
- fput(sbinfo->si_xigen);
- sbinfo->si_xigen = NULL;
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
- ino_t dir_ino)
-{
- struct dentry *dentry, *d;
- struct inode *inode;
- unsigned int sigen;
-
- dentry = NULL;
- inode = ilookup(sb, ino);
- if (!inode)
- goto out;
-
- dentry = ERR_PTR(-ESTALE);
- sigen = au_sigen(sb);
- if (unlikely(is_bad_inode(inode)
- || IS_DEADDIR(inode)
- || sigen != au_iigen(inode)))
- goto out_iput;
-
- dentry = NULL;
- if (!dir_ino || S_ISDIR(inode->i_mode))
- dentry = d_find_alias(inode);
- else {
- spin_lock(&dcache_lock);
- list_for_each_entry(d, &inode->i_dentry, d_alias)
- if (!au_test_anon(d)
- && d->d_parent->d_inode->i_ino == dir_ino) {
- dentry = dget_locked(d);
- break;
- }
- spin_unlock(&dcache_lock);
- }
- if (unlikely(dentry && sigen != au_digen(dentry))) {
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
- }
-
- out_iput:
- iput(inode);
- out:
- return dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: dirty? */
-/* if exportfs_decode_fh() passed vfsmount*, we could be happy */
-
-struct au_compare_mnt_args {
- /* input */
- struct super_block *sb;
-
- /* output */
- struct vfsmount *mnt;
-};
-
-static int au_compare_mnt(struct vfsmount *mnt, void *arg)
-{
- struct au_compare_mnt_args *a = arg;
-
- if (mnt->mnt_sb != a->sb)
- return 0;
- a->mnt = mntget(mnt);
- return 1;
-}
-
-static struct vfsmount *au_mnt_get(struct super_block *sb)
-{
- int err;
- struct au_compare_mnt_args args = {
- .sb = sb
- };
- struct mnt_namespace *ns;
-
- /* no get/put ?? */
- AuDebugOn(!current->nsproxy);
- ns = current->nsproxy->mnt_ns;
- AuDebugOn(!ns);
- err = iterate_mounts(au_compare_mnt, &args, ns->root);
- AuDebugOn(!err);
- AuDebugOn(!args.mnt);
- return args.mnt;
-}
-
-struct au_nfsd_si_lock {
- unsigned int sigen;
- aufs_bindex_t br_id;
- unsigned char force_lock;
-};
-
-static aufs_bindex_t si_nfsd_read_lock(struct super_block *sb,
- struct au_nfsd_si_lock *nsi_lock)
-{
- aufs_bindex_t bindex;
-
- si_read_lock(sb, AuLock_FLUSH);
-
- /* branch id may be wrapped around */
- bindex = au_br_index(sb, nsi_lock->br_id);
- if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb))
- goto out; /* success */
-
- if (!nsi_lock->force_lock)
- si_read_unlock(sb);
- bindex = -1;
-
- out:
- return bindex;
-}
-
-struct find_name_by_ino {
- int called, found;
- ino_t ino;
- char *name;
- int namelen;
-};
-
-static int
-find_name_by_ino(void *arg, const char *name, int namelen, loff_t offset,
- u64 ino, unsigned int d_type)
-{
- struct find_name_by_ino *a = arg;
-
- a->called++;
- if (a->ino != ino)
- return 0;
-
- memcpy(a->name, name, namelen);
- a->namelen = namelen;
- a->found = 1;
- return 1;
-}
-
-static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino,
- struct au_nfsd_si_lock *nsi_lock)
-{
- struct dentry *dentry, *parent;
- struct file *file;
- struct inode *dir;
- struct find_name_by_ino arg;
- int err;
-
- parent = path->dentry;
- if (nsi_lock)
- si_read_unlock(parent->d_sb);
- file = vfsub_dentry_open(path, au_dir_roflags);
- dentry = (void *)file;
- if (IS_ERR(file))
- goto out;
-
- dentry = ERR_PTR(-ENOMEM);
- arg.name = __getname_gfp(GFP_NOFS);
- if (unlikely(!arg.name))
- goto out_file;
- arg.ino = ino;
- arg.found = 0;
- do {
- arg.called = 0;
- /* smp_mb(); */
- err = vfsub_readdir(file, find_name_by_ino, &arg);
- } while (!err && !arg.found && arg.called);
- dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_name;
- dentry = ERR_PTR(-ENOENT);
- if (!arg.found)
- goto out_name;
-
- /* do not call au_lkup_one() */
- dir = parent->d_inode;
- mutex_lock(&dir->i_mutex);
- dentry = vfsub_lookup_one_len(arg.name, parent, arg.namelen);
- mutex_unlock(&dir->i_mutex);
- AuTraceErrPtr(dentry);
- if (IS_ERR(dentry))
- goto out_name;
- AuDebugOn(au_test_anon(dentry));
- if (unlikely(!dentry->d_inode)) {
- dput(dentry);
- dentry = ERR_PTR(-ENOENT);
- }
-
- out_name:
- __putname(arg.name);
- out_file:
- fput(file);
- out:
- if (unlikely(nsi_lock
- && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0))
- if (!IS_ERR(dentry)) {
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
- }
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
- ino_t dir_ino,
- struct au_nfsd_si_lock *nsi_lock)
-{
- struct dentry *dentry;
- struct path path;
-
- if (dir_ino != AUFS_ROOT_INO) {
- path.dentry = decode_by_ino(sb, dir_ino, 0);
- dentry = path.dentry;
- if (!path.dentry || IS_ERR(path.dentry))
- goto out;
- AuDebugOn(au_test_anon(path.dentry));
- } else
- path.dentry = dget(sb->s_root);
-
- path.mnt = au_mnt_get(sb);
- dentry = au_lkup_by_ino(&path, ino, nsi_lock);
- path_put(&path);
-
- out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int h_acceptable(void *expv, struct dentry *dentry)
-{
- return 1;
-}
-
-static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath,
- char *buf, int len, struct super_block *sb)
-{
- char *p;
- int n;
- struct path path;
-
- p = d_path(h_rootpath, buf, len);
- if (IS_ERR(p))
- goto out;
- n = strlen(p);
-
- path.mnt = h_rootpath->mnt;
- path.dentry = h_parent;
- p = d_path(&path, buf, len);
- if (IS_ERR(p))
- goto out;
- if (n != 1)
- p += n;
-
- path.mnt = au_mnt_get(sb);
- path.dentry = sb->s_root;
- p = d_path(&path, buf, len - strlen(p));
- mntput(path.mnt);
- if (IS_ERR(p))
- goto out;
- if (n != 1)
- p[strlen(p)] = '/';
-
- out:
- AuTraceErrPtr(p);
- return p;
-}
-
-static
-struct dentry *decode_by_path(struct super_block *sb, aufs_bindex_t bindex,
- ino_t ino, __u32 *fh, int fh_len,
- struct au_nfsd_si_lock *nsi_lock)
-{
- struct dentry *dentry, *h_parent, *root;
- struct super_block *h_sb;
- char *pathname, *p;
- struct vfsmount *h_mnt;
- struct au_branch *br;
- int err;
- struct path path;
-
- br = au_sbr(sb, bindex);
- /* au_br_get(br); */
- h_mnt = br->br_mnt;
- h_sb = h_mnt->mnt_sb;
- /* todo: call lower fh_to_dentry()? fh_to_parent()? */
- h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail),
- fh_len - Fh_tail, fh[Fh_h_type],
- h_acceptable, /*context*/NULL);
- dentry = h_parent;
- if (unlikely(!h_parent || IS_ERR(h_parent))) {
- AuWarn1("%s decode_fh failed, %ld\n",
- au_sbtype(h_sb), PTR_ERR(h_parent));
- goto out;
- }
- dentry = NULL;
- if (unlikely(au_test_anon(h_parent))) {
- AuWarn1("%s decode_fh returned a disconnected dentry\n",
- au_sbtype(h_sb));
- goto out_h_parent;
- }
-
- dentry = ERR_PTR(-ENOMEM);
- pathname = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!pathname))
- goto out_h_parent;
-
- root = sb->s_root;
- path.mnt = h_mnt;
- di_read_lock_parent(root, !AuLock_IR);
- path.dentry = au_h_dptr(root, bindex);
- di_read_unlock(root, !AuLock_IR);
- p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb);
- dentry = (void *)p;
- if (IS_ERR(p))
- goto out_pathname;
-
- si_read_unlock(sb);
- err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
- dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_relock;
-
- dentry = ERR_PTR(-ENOENT);
- AuDebugOn(au_test_anon(path.dentry));
- if (unlikely(!path.dentry->d_inode))
- goto out_path;
-
- if (ino != path.dentry->d_inode->i_ino)
- dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL);
- else
- dentry = dget(path.dentry);
-
- out_path:
- path_put(&path);
- out_relock:
- if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0))
- if (!IS_ERR(dentry)) {
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
- }
- out_pathname:
- free_page((unsigned long)pathname);
- out_h_parent:
- dput(h_parent);
- out:
- /* au_br_put(br); */
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *
-aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
- int fh_type)
-{
- struct dentry *dentry;
- __u32 *fh = fid->raw;
- ino_t ino, dir_ino;
- aufs_bindex_t bindex;
- struct au_nfsd_si_lock nsi_lock = {
- .force_lock = 0
- };
-
- dentry = ERR_PTR(-ESTALE);
- /* it should never happen, but the file handle is unreliable */
- if (unlikely(fh_len < Fh_tail))
- goto out;
- nsi_lock.sigen = fh[Fh_sigen];
- nsi_lock.br_id = fh[Fh_br_id];
-
- /* branch id may be wrapped around */
- bindex = si_nfsd_read_lock(sb, &nsi_lock);
- if (unlikely(bindex < 0))
- goto out;
- nsi_lock.force_lock = 1;
-
- /* is this inode still cached? */
- ino = decode_ino(fh + Fh_ino);
- /* it should never happen */
- if (unlikely(ino == AUFS_ROOT_INO))
- goto out;
-
- dir_ino = decode_ino(fh + Fh_dir_ino);
- dentry = decode_by_ino(sb, ino, dir_ino);
- if (IS_ERR(dentry))
- goto out_unlock;
- if (dentry)
- goto accept;
-
- /* is the parent dir cached? */
- dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock);
- if (IS_ERR(dentry))
- goto out_unlock;
- if (dentry)
- goto accept;
-
- /* lookup path */
- dentry = decode_by_path(sb, bindex, ino, fh, fh_len, &nsi_lock);
- if (IS_ERR(dentry))
- goto out_unlock;
- if (unlikely(!dentry))
- /* todo?: make it ESTALE */
- goto out_unlock;
-
- accept:
- if (dentry->d_inode->i_generation == fh[Fh_igen])
- goto out_unlock; /* success */
-
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
- out_unlock:
- si_read_unlock(sb);
- out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-#if 0 /* reserved for future use */
-/* support subtreecheck option */
-static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid,
- int fh_len, int fh_type)
-{
- struct dentry *parent;
- __u32 *fh = fid->raw;
- ino_t dir_ino;
-
- dir_ino = decode_ino(fh + Fh_dir_ino);
- parent = decode_by_ino(sb, dir_ino, 0);
- if (IS_ERR(parent))
- goto out;
- if (!parent)
- parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]),
- dir_ino, fh, fh_len);
-
- out:
- AuTraceErrPtr(parent);
- return parent;
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
- int connectable)
-{
- int err;
- aufs_bindex_t bindex, bend;
- struct super_block *sb, *h_sb;
- struct inode *inode;
- struct dentry *parent, *h_parent;
- struct au_branch *br;
-
- AuDebugOn(au_test_anon(dentry));
-
- parent = NULL;
- err = -ENOSPC;
- if (unlikely(*max_len <= Fh_tail)) {
- AuWarn1("NFSv2 client (max_len %d)?\n", *max_len);
- goto out;
- }
-
- err = FILEID_ROOT;
- if (IS_ROOT(dentry)) {
- AuDebugOn(dentry->d_inode->i_ino != AUFS_ROOT_INO);
- goto out;
- }
-
- err = -EIO;
- h_parent = NULL;
- sb = dentry->d_sb;
- aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR);
- parent = dget_parent(dentry);
- di_read_lock_parent(parent, !AuLock_IR);
- inode = dentry->d_inode;
- AuDebugOn(!inode);
-#ifdef CONFIG_AUFS_DEBUG
- if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
- AuWarn1("NFS-exporting requires xino\n");
-#endif
-
- bend = au_dbtaildir(parent);
- for (bindex = au_dbstart(parent); bindex <= bend; bindex++) {
- h_parent = au_h_dptr(parent, bindex);
- if (h_parent) {
- dget(h_parent);
- break;
- }
- }
- if (unlikely(!h_parent))
- goto out_unlock;
-
- err = -EPERM;
- br = au_sbr(sb, bindex);
- h_sb = br->br_mnt->mnt_sb;
- if (unlikely(!h_sb->s_export_op)) {
- AuErr1("%s branch is not exportable\n", au_sbtype(h_sb));
- goto out_dput;
- }
-
- fh[Fh_br_id] = br->br_id;
- fh[Fh_sigen] = au_sigen(sb);
- encode_ino(fh + Fh_ino, inode->i_ino);
- encode_ino(fh + Fh_dir_ino, parent->d_inode->i_ino);
- fh[Fh_igen] = inode->i_generation;
-
- *max_len -= Fh_tail;
- fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail),
- max_len,
- /*connectable or subtreecheck*/0);
- err = fh[Fh_h_type];
- *max_len += Fh_tail;
- /* todo: macros? */
- if (err != 255)
- err = 99;
- else
- AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb));
-
- out_dput:
- dput(h_parent);
- out_unlock:
- di_read_unlock(parent, !AuLock_IR);
- dput(parent);
- aufs_read_unlock(dentry, AuLock_IR);
- out:
- if (unlikely(err < 0))
- err = 255;
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_commit_metadata(struct inode *inode)
-{
- int err;
- aufs_bindex_t bindex;
- struct super_block *sb;
- struct inode *h_inode;
- int (*f)(struct inode *inode);
-
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH);
- ii_write_lock_child(inode);
- bindex = au_ibstart(inode);
- AuDebugOn(bindex < 0);
- h_inode = au_h_iptr(inode, bindex);
-
- f = h_inode->i_sb->s_export_op->commit_metadata;
- if (f)
- err = f(h_inode);
- else {
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_ALL,
- .nr_to_write = 0 /* metadata only */
- };
-
- err = sync_inode(h_inode, &wbc);
- }
-
- au_cpup_attr_timesizes(inode);
- ii_write_unlock(inode);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct export_operations aufs_export_op = {
- .fh_to_dentry = aufs_fh_to_dentry,
- /* .fh_to_parent = aufs_fh_to_parent, */
- .encode_fh = aufs_encode_fh,
- .commit_metadata = aufs_commit_metadata
-};
-
-void au_export_init(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- __u32 u;
-
- sb->s_export_op = &aufs_export_op;
- sbinfo = au_sbi(sb);
- sbinfo->si_xigen = NULL;
- get_random_bytes(&u, sizeof(u));
- BUILD_BUG_ON(sizeof(u) != sizeof(int));
- atomic_set(&sbinfo->si_xigen_next, u);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * file and vm operations
- */
-
-#include <linux/file.h>
-#include <linux/fs_stack.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/security.h>
-#include "aufs.h"
-
-int au_do_open_nondir(struct file *file, int flags)
-{
- int err;
- aufs_bindex_t bindex;
- struct file *h_file;
- struct dentry *dentry;
- struct au_finfo *finfo;
-
- FiMustWriteLock(file);
-
- err = 0;
- dentry = file->f_dentry;
- finfo = au_fi(file);
- memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop));
- finfo->fi_hvmop = NULL;
- bindex = au_dbstart(dentry);
- h_file = au_h_open(dentry, bindex, flags, file);
- if (IS_ERR(h_file))
- err = PTR_ERR(h_file);
- else {
- au_set_fbstart(file, bindex);
- au_set_h_fptr(file, bindex, h_file);
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- }
- return err;
-}
-
-static int aufs_open_nondir(struct inode *inode __maybe_unused,
- struct file *file)
-{
- int err;
- struct super_block *sb;
-
- AuDbg("%.*s, f_ flags 0x%x, f_mode 0x%x\n",
- AuDLNPair(file->f_dentry), vfsub_file_flags(file),
- file->f_mode);
-
- sb = file->f_dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_do_open(file, au_do_open_nondir, /*fidir*/NULL);
- si_read_unlock(sb);
- return err;
-}
-
-int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file)
-{
- struct au_finfo *finfo;
- aufs_bindex_t bindex;
-
- finfo = au_fi(file);
- bindex = finfo->fi_btop;
- if (bindex >= 0)
- au_set_h_fptr(file, bindex, NULL);
-
- au_finfo_fin(file);
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_flush_nondir(struct file *file, fl_owner_t id)
-{
- int err;
- struct file *h_file;
-
- err = 0;
- h_file = au_hf_top(file);
- if (h_file)
- err = vfsub_flush(h_file, id);
- return err;
-}
-
-static int aufs_flush_nondir(struct file *file, fl_owner_t id)
-{
- return au_do_flush(file, id, au_do_flush_nondir);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static ssize_t aufs_read(struct file *file, char __user *buf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
- struct dentry *dentry;
- struct file *h_file;
- struct super_block *sb;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
- if (unlikely(err))
- goto out;
-
- h_file = au_hf_top(file);
- err = vfsub_read_u(h_file, buf, count, ppos);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
-
- di_read_unlock(dentry, AuLock_IR);
- fi_read_unlock(file);
- out:
- si_read_unlock(sb);
- return err;
-}
-
-static ssize_t aufs_write(struct file *file, const char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- ssize_t err;
- struct au_pin pin;
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
- struct file *h_file;
- char __user *buf = (char __user *)ubuf;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- si_read_lock(sb, AuLock_FLUSH);
-
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- err = au_ready_to_write(file, -1, &pin);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
-
- h_file = au_hf_top(file);
- au_unpin(&pin);
- err = vfsub_write_u(h_file, buf, count, ppos);
- au_cpup_attr_timesizes(inode);
- inode->i_mode = h_file->f_dentry->d_inode->i_mode;
-
- out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- out:
- si_read_unlock(sb);
- mutex_unlock(&inode->i_mutex);
- return err;
-}
-
-static ssize_t au_do_aio(struct file *h_file, int rw, struct kiocb *kio,
- const struct iovec *iov, unsigned long nv, loff_t pos)
-{
- ssize_t err;
- struct file *file;
- ssize_t (*func)(struct kiocb *, const struct iovec *, unsigned long,
- loff_t);
-
- err = security_file_permission(h_file, rw);
- if (unlikely(err))
- goto out;
-
- err = -ENOSYS;
- func = NULL;
- if (rw == MAY_READ)
- func = h_file->f_op->aio_read;
- else if (rw == MAY_WRITE)
- func = h_file->f_op->aio_write;
- if (func) {
- file = kio->ki_filp;
- kio->ki_filp = h_file;
- err = func(kio, iov, nv, pos);
- kio->ki_filp = file;
- } else
- /* currently there is no such fs */
- WARN_ON_ONCE(1);
-
- out:
- return err;
-}
-
-static ssize_t aufs_aio_read(struct kiocb *kio, const struct iovec *iov,
- unsigned long nv, loff_t pos)
-{
- ssize_t err;
- struct file *file, *h_file;
- struct dentry *dentry;
- struct super_block *sb;
-
- file = kio->ki_filp;
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
- if (unlikely(err))
- goto out;
-
- h_file = au_hf_top(file);
- err = au_do_aio(h_file, MAY_READ, kio, iov, nv, pos);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
- di_read_unlock(dentry, AuLock_IR);
- fi_read_unlock(file);
-
- out:
- si_read_unlock(sb);
- return err;
-}
-
-static ssize_t aufs_aio_write(struct kiocb *kio, const struct iovec *iov,
- unsigned long nv, loff_t pos)
-{
- ssize_t err;
- struct au_pin pin;
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
- struct file *file, *h_file;
-
- file = kio->ki_filp;
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- err = au_ready_to_write(file, -1, &pin);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
-
- au_unpin(&pin);
- h_file = au_hf_top(file);
- err = au_do_aio(h_file, MAY_WRITE, kio, iov, nv, pos);
- au_cpup_attr_timesizes(inode);
- inode->i_mode = h_file->f_dentry->d_inode->i_mode;
-
- out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- out:
- si_read_unlock(sb);
- mutex_unlock(&inode->i_mutex);
- return err;
-}
-
-static ssize_t aufs_splice_read(struct file *file, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
-{
- ssize_t err;
- struct file *h_file;
- struct dentry *dentry;
- struct super_block *sb;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
- if (unlikely(err))
- goto out;
-
- err = -EINVAL;
- h_file = au_hf_top(file);
- if (au_test_loopback_kthread()) {
- file->f_mapping = h_file->f_mapping;
- smp_mb(); /* unnecessary? */
- }
- err = vfsub_splice_to(h_file, ppos, pipe, len, flags);
- /* todo: necessasry? */
- /* file->f_ra = h_file->f_ra; */
- fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
-
- di_read_unlock(dentry, AuLock_IR);
- fi_read_unlock(file);
-
- out:
- si_read_unlock(sb);
- return err;
-}
-
-static ssize_t
-aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos,
- size_t len, unsigned int flags)
-{
- ssize_t err;
- struct au_pin pin;
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
- struct file *h_file;
-
- dentry = file->f_dentry;
- inode = dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
-
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- err = au_ready_to_write(file, -1, &pin);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
-
- h_file = au_hf_top(file);
- au_unpin(&pin);
- err = vfsub_splice_from(pipe, h_file, ppos, len, flags);
- au_cpup_attr_timesizes(inode);
- inode->i_mode = h_file->f_dentry->d_inode->i_mode;
-
- out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- out:
- si_read_unlock(sb);
- mutex_unlock(&inode->i_mutex);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct file *au_safe_file(struct vm_area_struct *vma)
-{
- struct file *file;
-
- file = vma->vm_file;
- if (file->private_data && au_test_aufs(file->f_dentry->d_sb))
- return file;
- return NULL;
-}
-
-static void au_reset_file(struct vm_area_struct *vma, struct file *file)
-{
- vma->vm_file = file;
- /* smp_mb(); */ /* flush vm_file */
-}
-
-static int aufs_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
- int err;
- static DECLARE_WAIT_QUEUE_HEAD(wq);
- struct file *file, *h_file;
- struct au_finfo *finfo;
-
- /* todo: non-robr mode, user vm_file as it is? */
- wait_event(wq, (file = au_safe_file(vma)));
-
- /* do not revalidate, no si lock */
- finfo = au_fi(file);
- AuDebugOn(finfo->fi_hdir);
- h_file = finfo->fi_htop.hf_file;
- AuDebugOn(!h_file || !finfo->fi_hvmop);
-
- mutex_lock(&finfo->fi_vm_mtx);
- vma->vm_file = h_file;
- err = finfo->fi_hvmop->fault(vma, vmf);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- au_reset_file(vma, file);
- mutex_unlock(&finfo->fi_vm_mtx);
-#if 0 /* def CONFIG_SMP */
- /* wake_up_nr(&wq, online_cpu - 1); */
- wake_up_all(&wq);
-#else
- wake_up(&wq);
-#endif
-
- return err;
-}
-
-static int aufs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
- int err;
- static DECLARE_WAIT_QUEUE_HEAD(wq);
- struct file *file, *h_file;
- struct au_finfo *finfo;
-
- wait_event(wq, (file = au_safe_file(vma)));
-
- finfo = au_fi(file);
- AuDebugOn(finfo->fi_hdir);
- h_file = finfo->fi_htop.hf_file;
- AuDebugOn(!h_file || !finfo->fi_hvmop);
-
- mutex_lock(&finfo->fi_vm_mtx);
- vma->vm_file = h_file;
- err = finfo->fi_hvmop->page_mkwrite(vma, vmf);
- au_reset_file(vma, file);
- mutex_unlock(&finfo->fi_vm_mtx);
- wake_up(&wq);
-
- return err;
-}
-
-static void aufs_vm_close(struct vm_area_struct *vma)
-{
- static DECLARE_WAIT_QUEUE_HEAD(wq);
- struct file *file, *h_file;
- struct au_finfo *finfo;
-
- wait_event(wq, (file = au_safe_file(vma)));
-
- finfo = au_fi(file);
- AuDebugOn(finfo->fi_hdir);
- h_file = finfo->fi_htop.hf_file;
- AuDebugOn(!h_file || !finfo->fi_hvmop);
-
- mutex_lock(&finfo->fi_vm_mtx);
- vma->vm_file = h_file;
- finfo->fi_hvmop->close(vma);
- au_reset_file(vma, file);
- mutex_unlock(&finfo->fi_vm_mtx);
- wake_up(&wq);
-}
-
-const struct vm_operations_struct aufs_vm_ops = {
- .close = aufs_vm_close,
- .fault = aufs_fault,
- .page_mkwrite = aufs_page_mkwrite
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */
-#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b)
-
-static unsigned long au_arch_prot_conv(unsigned long flags)
-{
- /* currently ppc64 only */
-#ifdef CONFIG_PPC64
- /* cf. linux/arch/powerpc/include/asm/mman.h */
- AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO);
- return AuConv_VM_PROT(flags, SAO);
-#else
- AuDebugOn(arch_calc_vm_prot_bits(-1));
- return 0;
-#endif
-}
-
-static unsigned long au_prot_conv(unsigned long flags)
-{
- return AuConv_VM_PROT(flags, READ)
- | AuConv_VM_PROT(flags, WRITE)
- | AuConv_VM_PROT(flags, EXEC)
- | au_arch_prot_conv(flags);
-}
-
-/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */
-#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b)
-
-static unsigned long au_flag_conv(unsigned long flags)
-{
- return AuConv_VM_MAP(flags, GROWSDOWN)
- | AuConv_VM_MAP(flags, DENYWRITE)
- | AuConv_VM_MAP(flags, EXECUTABLE)
- | AuConv_VM_MAP(flags, LOCKED);
-}
-
-static struct vm_operations_struct *
-au_hvmop(struct file *h_file, struct vm_area_struct *vma, unsigned long *flags)
-{
- struct vm_operations_struct *h_vmop;
- unsigned long prot;
- int err;
-
- h_vmop = ERR_PTR(-ENODEV);
- if (!h_file->f_op || !h_file->f_op->mmap)
- goto out;
-
- prot = au_prot_conv(vma->vm_flags);
- err = security_file_mmap(h_file, /*reqprot*/prot, prot,
- au_flag_conv(vma->vm_flags), vma->vm_start, 0);
- h_vmop = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- err = h_file->f_op->mmap(h_file, vma);
- h_vmop = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- /* oops, it became 'const' */
- h_vmop = (struct vm_operations_struct *)vma->vm_ops;
- *flags = vma->vm_flags;
- err = do_munmap(current->mm, vma->vm_start,
- vma->vm_end - vma->vm_start);
- if (unlikely(err)) {
- AuIOErr("failed internal unmapping %.*s, %d\n",
- AuDLNPair(h_file->f_dentry), err);
- h_vmop = ERR_PTR(-EIO);
- }
-
- out:
- return h_vmop;
-}
-
-/*
- * This is another ugly approach to keep the lock order, particularly
- * mm->mmap_sem and aufs rwsem. The previous approach was reverted and you can
- * find it in git-log, if you want.
- *
- * native readdir: i_mutex, copy_to_user, mmap_sem
- * aufs readdir: i_mutex, rwsem, nested-i_mutex, copy_to_user, mmap_sem
- *
- * Before aufs_mmap() mmap_sem is acquired already, but aufs_mmap() has to
- * acquire aufs rwsem. It introduces a circular locking dependency.
- * To address this problem, aufs_mmap() delegates the part which requires aufs
- * rwsem to its internal workqueue.
- */
-
-/* very ugly approach */
-#include "mtx.h"
-
-struct au_mmap_pre_args {
- /* input */
- struct file *file;
- struct vm_area_struct *vma;
-
- /* output */
- int *errp;
- struct file *h_file;
- struct au_branch *br;
- int mmapped;
-};
-
-static int au_mmap_pre(struct file *file, struct vm_area_struct *vma,
- struct file **h_file, struct au_branch **br,
- int *mmapped)
-{
- int err;
- aufs_bindex_t bstart;
- const unsigned char wlock
- = !!(file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED);
- struct dentry *dentry;
- struct super_block *sb;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- si_read_lock(sb, !AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- *mmapped = !!au_test_mmapped(file);
- if (wlock) {
- struct au_pin pin;
-
- err = au_ready_to_write(file, -1, &pin);
- di_write_unlock(dentry);
- if (unlikely(err))
- goto out_unlock;
- au_unpin(&pin);
- } else
- di_write_unlock(dentry);
- bstart = au_fbstart(file);
- *br = au_sbr(sb, bstart);
- *h_file = au_hf_top(file);
- get_file(*h_file);
- au_fi_mmap_lock(file);
-
-out_unlock:
- fi_write_unlock(file);
-out:
- si_read_unlock(sb);
- return err;
-}
-
-static void au_call_mmap_pre(void *args)
-{
- struct au_mmap_pre_args *a = args;
- *a->errp = au_mmap_pre(a->file, a->vma, &a->h_file, &a->br,
- &a->mmapped);
-}
-
-static int aufs_mmap(struct file *file, struct vm_area_struct *vma)
-{
- int err, wkq_err;
- unsigned long h_vmflags;
- struct au_finfo *finfo;
- struct dentry *h_dentry;
- struct vm_operations_struct *h_vmop, *vmop;
- struct au_mmap_pre_args args = {
- .file = file,
- .vma = vma,
- .errp = &err
- };
-
- wkq_err = au_wkq_wait(au_call_mmap_pre, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- if (unlikely(err))
- goto out;
- finfo = au_fi(file);
- mutex_set_owner(&finfo->fi_mmap);
-
- h_dentry = args.h_file->f_dentry;
- if (!args.mmapped && au_test_fs_bad_mapping(h_dentry->d_sb)) {
- /*
- * by this assignment, f_mapping will differs from aufs inode
- * i_mapping.
- * if someone else mixes the use of f_dentry->d_inode and
- * f_mapping->host, then a problem may arise.
- */
- file->f_mapping = args.h_file->f_mapping;
- }
-
- /* always try this internal mmap to get vma flags */
- h_vmflags = 0; /* gcc warning */
- h_vmop = au_hvmop(args.h_file, vma, &h_vmflags);
- err = PTR_ERR(h_vmop);
- if (IS_ERR(h_vmop))
- goto out_unlock;
- AuDebugOn(args.mmapped && h_vmop != finfo->fi_hvmop);
-
- vmop = (void *)au_dy_vmop(file, args.br, h_vmop);
- err = PTR_ERR(vmop);
- if (IS_ERR(vmop))
- goto out_unlock;
-
- /*
- * unnecessary to handle MAP_DENYWRITE and deny_write_access()?
- * currently MAP_DENYWRITE from userspace is ignored, but elf loader
- * sets it. when FMODE_EXEC is set (by open_exec() or sys_uselib()),
- * both of the aufs file and the lower file is deny_write_access()-ed.
- * finally I hope we can skip handlling MAP_DENYWRITE here.
- */
- err = generic_file_mmap(file, vma);
- if (unlikely(err))
- goto out_unlock;
-
- vma->vm_ops = vmop;
- vma->vm_flags = h_vmflags;
- if (!args.mmapped)
- finfo->fi_hvmop = h_vmop;
-
- vfsub_file_accessed(args.h_file);
- /* update without lock, I don't think it a problem */
- fsstack_copy_attr_atime(file->f_dentry->d_inode, h_dentry->d_inode);
-
- out_unlock:
- au_fi_mmap_unlock(file);
- fput(args.h_file);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_fsync_nondir(struct file *file, struct dentry *dentry,
- int datasync)
-{
- int err;
- struct au_pin pin;
- struct inode *inode;
- struct file *h_file;
- struct super_block *sb;
-
- inode = dentry->d_inode;
- IMustLock(file->f_mapping->host);
- if (inode != file->f_mapping->host) {
- mutex_unlock(&file->f_mapping->host->i_mutex);
- mutex_lock(&inode->i_mutex);
- }
- IMustLock(inode);
-
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
-
- err = 0; /* -EBADF; */ /* posix? */
- if (unlikely(!(file->f_mode & FMODE_WRITE)))
- goto out;
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- err = au_ready_to_write(file, -1, &pin);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
- au_unpin(&pin);
-
- err = -EINVAL;
- h_file = au_hf_top(file);
- if (h_file->f_op && h_file->f_op->fsync) {
- struct dentry *h_d;
- struct mutex *h_mtx;
-
- /*
- * no filemap_fdatawrite() since aufs file has no its own
- * mapping, but dir.
- */
- h_d = h_file->f_dentry;
- h_mtx = &h_d->d_inode->i_mutex;
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- err = h_file->f_op->fsync(h_file, h_d, datasync);
- if (!err)
- vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
- /*ignore*/
- au_cpup_attr_timesizes(inode);
- mutex_unlock(h_mtx);
- }
-
- out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- out:
- si_read_unlock(sb);
- if (inode != file->f_mapping->host) {
- mutex_unlock(&inode->i_mutex);
- mutex_lock(&file->f_mapping->host->i_mutex);
- }
- return err;
-}
-
-/* no one supports this operation, currently */
-#if 0
-static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync)
-{
- int err;
- struct au_pin pin;
- struct dentry *dentry;
- struct inode *inode;
- struct file *file, *h_file;
- struct super_block *sb;
-
- file = kio->ki_filp;
- dentry = file->f_dentry;
- inode = dentry->d_inode;
- mutex_lock(&inode->i_mutex);
-
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
-
- err = 0; /* -EBADF; */ /* posix? */
- if (unlikely(!(file->f_mode & FMODE_WRITE)))
- goto out;
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- err = au_ready_to_write(file, -1, &pin);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
- au_unpin(&pin);
-
- err = -ENOSYS;
- h_file = au_hf_top(file);
- if (h_file->f_op && h_file->f_op->aio_fsync) {
- struct dentry *h_d;
- struct mutex *h_mtx;
-
- h_d = h_file->f_dentry;
- h_mtx = &h_d->d_inode->i_mutex;
- if (!is_sync_kiocb(kio)) {
- get_file(h_file);
- fput(file);
- }
- kio->ki_filp = h_file;
- err = h_file->f_op->aio_fsync(kio, datasync);
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- if (!err)
- vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
- /*ignore*/
- au_cpup_attr_timesizes(inode);
- mutex_unlock(h_mtx);
- }
-
- out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- out:
- si_read_unlock(sb);
- mutex_unlock(&inode->i_mutex);
- return err;
-}
-#endif
-
-static int aufs_fasync(int fd, struct file *file, int flag)
-{
- int err;
- struct file *h_file;
- struct dentry *dentry;
- struct super_block *sb;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
- if (unlikely(err))
- goto out;
-
- h_file = au_hf_top(file);
- if (h_file->f_op && h_file->f_op->fasync)
- err = h_file->f_op->fasync(fd, h_file, flag);
-
- di_read_unlock(dentry, AuLock_IR);
- fi_read_unlock(file);
-
- out:
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* no one supports this operation, currently */
-#if 0
-static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset,
- size_t len, loff_t *pos , int more)
-{
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-const struct file_operations aufs_file_fop = {
- .owner = THIS_MODULE,
- /*
- * while generic_file_llseek/_unlocked() don't use BKL,
- * don't use it since it operates file->f_mapping->host.
- * in aufs, it may be a real file and may confuse users by UDBA.
- */
- /* .llseek = generic_file_llseek, */
-
- .read = aufs_read,
- .write = aufs_write,
- .aio_read = aufs_aio_read,
- .aio_write = aufs_aio_write,
-#ifdef CONFIG_AUFS_POLL
- .poll = aufs_poll,
-#endif
- .unlocked_ioctl = aufs_ioctl_nondir,
- .mmap = aufs_mmap,
- .open = aufs_open_nondir,
- .flush = aufs_flush_nondir,
- .release = aufs_release_nondir,
- .fsync = aufs_fsync_nondir,
- /* .aio_fsync = aufs_aio_fsync_nondir, */
- .fasync = aufs_fasync,
- /* .sendpage = aufs_sendpage, */
- .splice_write = aufs_splice_write,
- .splice_read = aufs_splice_read,
-#if 0
- .aio_splice_write = aufs_aio_splice_write,
- .aio_splice_read = aufs_aio_splice_read
-#endif
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * file operations for special files.
- * while they exist in aufs virtually,
- * their file I/O is handled out of aufs.
- */
-
-#include <linux/fs_stack.h>
-#include "aufs.h"
-
-static ssize_t aufs_aio_read_sp(struct kiocb *kio, const struct iovec *iov,
- unsigned long nv, loff_t pos)
-{
- ssize_t err;
- aufs_bindex_t bstart;
- unsigned char wbr;
- struct file *file, *h_file;
- struct super_block *sb;
-
- file = kio->ki_filp;
- sb = file->f_dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- fi_read_lock(file);
- bstart = au_fbstart(file);
- h_file = au_hf_top(file);
- fi_read_unlock(file);
- wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
- si_read_unlock(sb);
-
- /* do not change the file in kio */
- AuDebugOn(!h_file->f_op || !h_file->f_op->aio_read);
- err = h_file->f_op->aio_read(kio, iov, nv, pos);
- if (err > 0 && wbr)
- file_accessed(h_file);
-
- return err;
-}
-
-static ssize_t aufs_aio_write_sp(struct kiocb *kio, const struct iovec *iov,
- unsigned long nv, loff_t pos)
-{
- ssize_t err;
- aufs_bindex_t bstart;
- unsigned char wbr;
- struct super_block *sb;
- struct file *file, *h_file;
-
- file = kio->ki_filp;
- sb = file->f_dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- fi_read_lock(file);
- bstart = au_fbstart(file);
- h_file = au_hf_top(file);
- fi_read_unlock(file);
- wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
- si_read_unlock(sb);
-
- /* do not change the file in kio */
- AuDebugOn(!h_file->f_op || !h_file->f_op->aio_write);
- err = h_file->f_op->aio_write(kio, iov, nv, pos);
- if (err > 0 && wbr)
- file_update_time(h_file);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_release_sp(struct inode *inode, struct file *file)
-{
- int err;
- struct file *h_file;
-
- fi_read_lock(file);
- h_file = au_hf_top(file);
- fi_read_unlock(file);
- /* close this fifo in aufs */
- err = h_file->f_op->release(inode, file); /* ignore */
- aufs_release_nondir(inode, file); /* ignore */
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* currently, support only FIFO */
-enum {AuSp_FIFO, AuSp_FIFO_R, AuSp_FIFO_W, AuSp_FIFO_RW,
- /* AuSp_SOCK, AuSp_CHR, AuSp_BLK, */
- AuSp_Last};
-static int aufs_open_sp(struct inode *inode, struct file *file);
-static struct au_sp_fop {
- int done;
- struct file_operations fop; /* not 'const' */
- spinlock_t spin;
-} au_sp_fop[AuSp_Last] = {
- [AuSp_FIFO] = {
- .fop = {
- .owner = THIS_MODULE,
- .open = aufs_open_sp
- }
- }
-};
-
-static void au_init_fop_sp(struct file *file)
-{
- struct au_sp_fop *p;
- int i;
- struct file *h_file;
-
- p = au_sp_fop;
- if (unlikely(!p->done)) {
- /* initialize first time only */
- static DEFINE_SPINLOCK(spin);
-
- spin_lock(&spin);
- if (!p->done) {
- BUILD_BUG_ON(sizeof(au_sp_fop)/sizeof(*au_sp_fop)
- != AuSp_Last);
- for (i = 0; i < AuSp_Last; i++)
- spin_lock_init(&p[i].spin);
- p->done = 1;
- }
- spin_unlock(&spin);
- }
-
- switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
- case FMODE_READ:
- i = AuSp_FIFO_R;
- break;
- case FMODE_WRITE:
- i = AuSp_FIFO_W;
- break;
- case FMODE_READ | FMODE_WRITE:
- i = AuSp_FIFO_RW;
- break;
- default:
- BUG();
- }
-
- p += i;
- if (unlikely(!p->done)) {
- /* initialize first time only */
- h_file = au_hf_top(file);
- spin_lock(&p->spin);
- if (!p->done) {
- p->fop = *h_file->f_op;
- p->fop.owner = THIS_MODULE;
- if (p->fop.aio_read)
- p->fop.aio_read = aufs_aio_read_sp;
- if (p->fop.aio_write)
- p->fop.aio_write = aufs_aio_write_sp;
- p->fop.release = aufs_release_sp;
- p->done = 1;
- }
- spin_unlock(&p->spin);
- }
- file->f_op = &p->fop;
-}
-
-static int au_cpup_sp(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bcpup;
- struct au_pin pin;
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = 0
- };
-
- AuDbg("%.*s\n", AuDLNPair(dentry));
-
- di_read_unlock(dentry, AuLock_IR);
- di_write_lock_child(dentry);
- err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
- if (unlikely(err < 0))
- goto out;
- bcpup = err;
- err = 0;
- if (bcpup == au_dbstart(dentry))
- goto out; /* success */
-
- err = au_pin(&pin, dentry, bcpup, au_opt_udba(dentry->d_sb),
- AuPin_MNT_WRITE);
- if (!err) {
- err = au_sio_cpup_simple(dentry, bcpup, -1, AuCpup_DTIME);
- au_unpin(&pin);
- }
-
- out:
- di_downgrade_lock(dentry, AuLock_IR);
- return err;
-}
-
-static int au_do_open_sp(struct file *file, int flags)
-{
- int err;
- struct dentry *dentry;
- struct super_block *sb;
- struct file *h_file;
- struct inode *h_inode;
-
- dentry = file->f_dentry;
- AuDbg("%.*s\n", AuDLNPair(dentry));
-
- /*
- * try copying-up.
- * operate on the ro branch is not an error.
- */
- au_cpup_sp(dentry); /* ignore */
-
- /* prepare h_file */
- err = au_do_open_nondir(file, vfsub_file_flags(file));
- if (unlikely(err))
- goto out;
-
- sb = dentry->d_sb;
- h_file = au_hf_top(file);
- h_inode = h_file->f_dentry->d_inode;
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- si_read_unlock(sb);
- /* open this fifo in aufs */
- err = h_inode->i_fop->open(file->f_dentry->d_inode, file);
- si_noflush_read_lock(sb);
- fi_write_lock(file);
- di_read_lock_child(dentry, AuLock_IR);
- if (!err)
- au_init_fop_sp(file);
- else
- au_finfo_fin(file);
-
- out:
- return err;
-}
-
-static int aufs_open_sp(struct inode *inode, struct file *file)
-{
- int err;
- struct super_block *sb;
-
- sb = file->f_dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_do_open(file, au_do_open_sp, /*fidir*/NULL);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev)
-{
- init_special_inode(inode, mode, rdev);
-
- switch (mode & S_IFMT) {
- case S_IFIFO:
- inode->i_fop = &au_sp_fop[AuSp_FIFO].fop;
- /*FALLTHROUGH*/
- case S_IFCHR:
- case S_IFBLK:
- case S_IFSOCK:
- break;
- default:
- AuDebugOn(1);
- }
-}
-
-int au_special_file(umode_t mode)
-{
- int ret;
-
- ret = 0;
- switch (mode & S_IFMT) {
- case S_IFIFO:
-#if 0
- case S_IFCHR:
- case S_IFBLK:
- case S_IFSOCK:
-#endif
- ret = 1;
- }
-
- return ret;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * handling file/dir, and address_space operation
- */
-
-#include <linux/file.h>
-#include <linux/fsnotify.h>
-#include <linux/namei.h>
-#include <linux/pagemap.h>
-#include "aufs.h"
-
-/* drop flags for writing */
-unsigned int au_file_roflags(unsigned int flags)
-{
- flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC);
- flags |= O_RDONLY | O_NOATIME;
- return flags;
-}
-
-/* common functions to regular file and dir */
-struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
- struct file *file)
-{
- struct file *h_file;
- struct dentry *h_dentry;
- struct inode *h_inode;
- struct super_block *sb;
- struct au_branch *br;
- struct path h_path;
- int err, exec_flag;
-
- /* a race condition can happen between open and unlink/rmdir */
- h_file = ERR_PTR(-ENOENT);
- h_dentry = au_h_dptr(dentry, bindex);
- if (au_test_nfsd(current) && !h_dentry)
- goto out;
- h_inode = h_dentry->d_inode;
- if (au_test_nfsd(current) && !h_inode)
- goto out;
- if (unlikely((!d_unhashed(dentry) && d_unhashed(h_dentry))
- || !h_inode))
- goto out;
-
- sb = dentry->d_sb;
- br = au_sbr(sb, bindex);
- h_file = ERR_PTR(-EACCES);
- exec_flag = flags & vfsub_fmode_to_uint(FMODE_EXEC);
- if (exec_flag && (br->br_mnt->mnt_flags & MNT_NOEXEC))
- goto out;
-
- /* drop flags for writing */
- if (au_test_ro(sb, bindex, dentry->d_inode))
- flags = au_file_roflags(flags);
- flags &= ~O_CREAT;
- atomic_inc(&br->br_count);
- h_path.dentry = h_dentry;
- h_path.mnt = br->br_mnt;
- if (!au_special_file(h_inode->i_mode))
- h_file = vfsub_dentry_open(&h_path, flags);
- else {
- /* this block depends upon the configuration */
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
- si_read_unlock(sb);
- h_file = vfsub_dentry_open(&h_path, flags);
- si_noflush_read_lock(sb);
- fi_write_lock(file);
- di_read_lock_child(dentry, AuLock_IR);
- }
- if (IS_ERR(h_file))
- goto out_br;
-
- if (exec_flag) {
- err = deny_write_access(h_file);
- if (unlikely(err)) {
- fput(h_file);
- h_file = ERR_PTR(err);
- goto out_br;
- }
- }
- fsnotify_open(h_dentry);
- goto out; /* success */
-
- out_br:
- atomic_dec(&br->br_count);
- out:
- return h_file;
-}
-
-int au_do_open(struct file *file, int (*open)(struct file *file, int flags),
- struct au_fidir *fidir)
-{
- int err;
- struct dentry *dentry;
-
- err = au_finfo_init(file, fidir);
- if (unlikely(err))
- goto out;
-
- dentry = file->f_dentry;
- di_read_lock_child(dentry, AuLock_IR);
- err = open(file, vfsub_file_flags(file));
- di_read_unlock(dentry, AuLock_IR);
-
- fi_write_unlock(file);
- if (unlikely(err)) {
- au_fi(file)->fi_hdir = NULL;
- au_finfo_fin(file);
- }
-
- out:
- return err;
-}
-
-int au_reopen_nondir(struct file *file)
-{
- int err;
- aufs_bindex_t bstart;
- struct dentry *dentry;
- struct file *h_file, *h_file_tmp;
-
- dentry = file->f_dentry;
- AuDebugOn(au_special_file(dentry->d_inode->i_mode));
- bstart = au_dbstart(dentry);
- h_file_tmp = NULL;
- if (au_fbstart(file) == bstart) {
- h_file = au_hf_top(file);
- if (file->f_mode == h_file->f_mode)
- return 0; /* success */
- h_file_tmp = h_file;
- get_file(h_file_tmp);
- au_set_h_fptr(file, bstart, NULL);
- }
- AuDebugOn(au_fi(file)->fi_hdir);
- AuDebugOn(au_fbstart(file) < bstart);
-
- h_file = au_h_open(dentry, bstart, vfsub_file_flags(file) & ~O_TRUNC,
- file);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out; /* todo: close all? */
-
- err = 0;
- au_set_fbstart(file, bstart);
- au_set_h_fptr(file, bstart, h_file);
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
-
- out:
- if (h_file_tmp)
- fput(h_file_tmp);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_reopen_wh(struct file *file, aufs_bindex_t btgt,
- struct dentry *hi_wh)
-{
- int err;
- aufs_bindex_t bstart;
- struct au_dinfo *dinfo;
- struct dentry *h_dentry;
- struct au_hdentry *hdp;
-
- dinfo = au_di(file->f_dentry);
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- bstart = dinfo->di_bstart;
- dinfo->di_bstart = btgt;
- hdp = dinfo->di_hdentry;
- h_dentry = hdp[0 + btgt].hd_dentry;
- hdp[0 + btgt].hd_dentry = hi_wh;
- err = au_reopen_nondir(file);
- hdp[0 + btgt].hd_dentry = h_dentry;
- dinfo->di_bstart = bstart;
-
- return err;
-}
-
-static int au_ready_to_write_wh(struct file *file, loff_t len,
- aufs_bindex_t bcpup)
-{
- int err;
- struct inode *inode;
- struct dentry *dentry, *hi_wh;
-
- dentry = file->f_dentry;
- au_update_dbstart(dentry);
- inode = dentry->d_inode;
- hi_wh = au_hi_wh(inode, bcpup);
- if (!hi_wh)
- err = au_sio_cpup_wh(dentry, bcpup, len, file);
- else
- /* already copied-up after unlink */
- err = au_reopen_wh(file, bcpup, hi_wh);
-
- if (!err
- && inode->i_nlink > 1
- && au_opt_test(au_mntflags(dentry->d_sb), PLINK))
- au_plink_append(inode, bcpup, au_h_dptr(dentry, bcpup));
-
- return err;
-}
-
-/*
- * prepare the @file for writing.
- */
-int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin)
-{
- int err;
- aufs_bindex_t bstart, bcpup;
- struct dentry *dentry, *parent, *h_dentry;
- struct inode *h_inode, *inode;
- struct super_block *sb;
- struct file *h_file;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- AuDebugOn(au_special_file(inode->i_mode));
- bstart = au_fbstart(file);
- err = au_test_ro(sb, bstart, inode);
- if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) {
- err = au_pin(pin, dentry, bstart, AuOpt_UDBA_NONE, /*flags*/0);
- goto out;
- }
-
- /* need to cpup */
- parent = dget_parent(dentry);
- di_write_lock_parent(parent);
- err = AuWbrCopyup(au_sbi(sb), dentry);
- bcpup = err;
- if (unlikely(err < 0))
- goto out_dgrade;
- err = 0;
-
- if (!au_h_dptr(parent, bcpup)) {
- err = au_cpup_dirs(dentry, bcpup);
- if (unlikely(err))
- goto out_dgrade;
- }
-
- err = au_pin(pin, dentry, bcpup, AuOpt_UDBA_NONE,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out_dgrade;
-
- h_dentry = au_hf_top(file)->f_dentry;
- h_inode = h_dentry->d_inode;
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- h_file = au_h_open_pre(dentry, bstart);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- h_file = NULL;
- } else if (d_unhashed(dentry) /* || d_unhashed(h_dentry) */
- /* || !h_inode->i_nlink */) {
- err = au_ready_to_write_wh(file, len, bcpup);
- di_downgrade_lock(parent, AuLock_IR);
- } else {
- di_downgrade_lock(parent, AuLock_IR);
- if (!au_h_dptr(dentry, bcpup))
- err = au_sio_cpup_simple(dentry, bcpup, len,
- AuCpup_DTIME);
- if (!err)
- err = au_reopen_nondir(file);
- }
- mutex_unlock(&h_inode->i_mutex);
- au_h_open_post(dentry, bstart, h_file);
-
- if (!err) {
- au_pin_set_parent_lflag(pin, /*lflag*/0);
- goto out_dput; /* success */
- }
- au_unpin(pin);
- goto out_unlock;
-
- out_dgrade:
- di_downgrade_lock(parent, AuLock_IR);
- out_unlock:
- di_read_unlock(parent, AuLock_IR);
- out_dput:
- dput(parent);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_do_flush(struct file *file, fl_owner_t id,
- int (*flush)(struct file *file, fl_owner_t id))
-{
- int err;
- struct dentry *dentry;
- struct super_block *sb;
- struct inode *inode;
-
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- si_noflush_read_lock(sb);
- fi_read_lock(file);
- di_read_lock_child(dentry, AuLock_IW);
-
- err = flush(file, id);
- au_cpup_attr_timesizes(inode);
-
- di_read_unlock(dentry, AuLock_IW);
- fi_read_unlock(file);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_file_refresh_by_inode(struct file *file, int *need_reopen)
-{
- int err;
- aufs_bindex_t bstart;
- struct au_pin pin;
- struct au_finfo *finfo;
- struct dentry *dentry, *parent, *hi_wh;
- struct inode *inode;
- struct super_block *sb;
-
- FiMustWriteLock(file);
-
- err = 0;
- finfo = au_fi(file);
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- bstart = au_ibstart(inode);
- if (bstart == finfo->fi_btop)
- goto out;
-
- parent = dget_parent(dentry);
- if (au_test_ro(sb, bstart, inode)) {
- di_read_lock_parent(parent, !AuLock_IR);
- err = AuWbrCopyup(au_sbi(sb), dentry);
- bstart = err;
- di_read_unlock(parent, !AuLock_IR);
- if (unlikely(err < 0))
- goto out_parent;
- err = 0;
- }
-
- di_read_lock_parent(parent, AuLock_IR);
- hi_wh = au_hi_wh(inode, bstart);
- if (au_opt_test(au_mntflags(sb), PLINK)
- && au_plink_test(inode)
- && !d_unhashed(dentry)) {
- err = au_test_and_cpup_dirs(dentry, bstart);
- if (unlikely(err))
- goto out_unlock;
-
- /* always superio. */
- err = au_pin(&pin, dentry, bstart, AuOpt_UDBA_NONE,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (!err)
- err = au_sio_cpup_simple(dentry, bstart, -1,
- AuCpup_DTIME);
- au_unpin(&pin);
- } else if (hi_wh) {
- /* already copied-up after unlink */
- err = au_reopen_wh(file, bstart, hi_wh);
- *need_reopen = 0;
- }
-
- out_unlock:
- di_read_unlock(parent, AuLock_IR);
- out_parent:
- dput(parent);
- out:
- return err;
-}
-
-static void au_do_refresh_dir(struct file *file)
-{
- aufs_bindex_t bindex, bend, new_bindex, brid;
- struct au_hfile *p, tmp, *q;
- struct au_finfo *finfo;
- struct super_block *sb;
- struct au_fidir *fidir;
-
- FiMustWriteLock(file);
-
- sb = file->f_dentry->d_sb;
- finfo = au_fi(file);
- fidir = finfo->fi_hdir;
- AuDebugOn(!fidir);
- p = fidir->fd_hfile + finfo->fi_btop;
- brid = p->hf_br->br_id;
- bend = fidir->fd_bbot;
- for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) {
- if (!p->hf_file)
- continue;
-
- new_bindex = au_br_index(sb, p->hf_br->br_id);
- if (new_bindex == bindex)
- continue;
- if (new_bindex < 0) {
- au_set_h_fptr(file, bindex, NULL);
- continue;
- }
-
- /* swap two lower inode, and loop again */
- q = fidir->fd_hfile + new_bindex;
- tmp = *q;
- *q = *p;
- *p = tmp;
- if (tmp.hf_file) {
- bindex--;
- p--;
- }
- }
-
- p = fidir->fd_hfile;
- if (!au_test_mmapped(file) && !d_unhashed(file->f_dentry)) {
- bend = au_sbend(sb);
- for (finfo->fi_btop = 0; finfo->fi_btop <= bend;
- finfo->fi_btop++, p++)
- if (p->hf_file) {
- if (p->hf_file->f_dentry
- && p->hf_file->f_dentry->d_inode)
- break;
- else
- au_hfput(p, file);
- }
- } else {
- bend = au_br_index(sb, brid);
- for (finfo->fi_btop = 0; finfo->fi_btop < bend;
- finfo->fi_btop++, p++)
- if (p->hf_file)
- au_hfput(p, file);
- bend = au_sbend(sb);
- }
-
- p = fidir->fd_hfile + bend;
- for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop;
- fidir->fd_bbot--, p--)
- if (p->hf_file) {
- if (p->hf_file->f_dentry
- && p->hf_file->f_dentry->d_inode)
- break;
- else
- au_hfput(p, file);
- }
- AuDebugOn(fidir->fd_bbot < finfo->fi_btop);
-}
-
-/*
- * after branch manipulating, refresh the file.
- */
-static int refresh_file(struct file *file, int (*reopen)(struct file *file))
-{
- int err, need_reopen;
- aufs_bindex_t bend, bindex;
- struct dentry *dentry;
- struct au_finfo *finfo;
- struct au_hfile *hfile;
-
- dentry = file->f_dentry;
- finfo = au_fi(file);
- if (!finfo->fi_hdir) {
- hfile = &finfo->fi_htop;
- AuDebugOn(!hfile->hf_file);
- bindex = au_br_index(dentry->d_sb, hfile->hf_br->br_id);
- AuDebugOn(bindex < 0);
- if (bindex != finfo->fi_btop)
- au_set_fbstart(file, bindex);
- } else {
- err = au_fidir_realloc(finfo, au_sbend(dentry->d_sb) + 1);
- if (unlikely(err))
- goto out;
- au_do_refresh_dir(file);
- }
-
- err = 0;
- need_reopen = 1;
- if (!au_test_mmapped(file))
- err = au_file_refresh_by_inode(file, &need_reopen);
- if (!err && need_reopen && !d_unhashed(dentry))
- err = reopen(file);
- if (!err) {
- au_update_figen(file);
- goto out; /* success */
- }
-
- /* error, close all lower files */
- if (finfo->fi_hdir) {
- bend = au_fbend_dir(file);
- for (bindex = au_fbstart(file); bindex <= bend; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- }
-
- out:
- return err;
-}
-
-/* common function to regular file and dir */
-int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
- int wlock)
-{
- int err;
- unsigned int sigen, figen;
- aufs_bindex_t bstart;
- unsigned char pseudo_link;
- struct dentry *dentry;
- struct inode *inode;
-
- err = 0;
- dentry = file->f_dentry;
- inode = dentry->d_inode;
- AuDebugOn(au_special_file(inode->i_mode));
- sigen = au_sigen(dentry->d_sb);
- fi_write_lock(file);
- figen = au_figen(file);
- di_write_lock_child(dentry);
- bstart = au_dbstart(dentry);
- pseudo_link = (bstart != au_ibstart(inode));
- if (sigen == figen && !pseudo_link && au_fbstart(file) == bstart) {
- if (!wlock) {
- di_downgrade_lock(dentry, AuLock_IR);
- fi_downgrade_lock(file);
- }
- goto out; /* success */
- }
-
- AuDbg("sigen %d, figen %d\n", sigen, figen);
- if (sigen != au_digen(dentry)
- || sigen != au_iigen(inode)) {
- err = au_reval_dpath(dentry, sigen);
- if (unlikely(err < 0))
- goto out;
- AuDebugOn(au_digen(dentry) != sigen
- || au_iigen(inode) != sigen);
- }
-
- err = refresh_file(file, reopen);
- if (!err) {
- if (!wlock) {
- di_downgrade_lock(dentry, AuLock_IR);
- fi_downgrade_lock(file);
- }
- } else {
- di_write_unlock(dentry);
- fi_write_unlock(file);
- }
-
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* cf. aufs_nopage() */
-/* for madvise(2) */
-static int aufs_readpage(struct file *file __maybe_unused, struct page *page)
-{
- unlock_page(page);
- return 0;
-}
-
-/* it will never be called, but necessary to support O_DIRECT */
-static ssize_t aufs_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
-{ BUG(); return 0; }
-
-/*
- * it will never be called, but madvise and fadvise behaves differently
- * when get_xip_mem is defined
- */
-static int aufs_get_xip_mem(struct address_space *mapping, pgoff_t pgoff,
- int create, void **kmem, unsigned long *pfn)
-{ BUG(); return 0; }
-
-/* they will never be called. */
-#ifdef CONFIG_AUFS_DEBUG
-static int aufs_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
-{ AuUnsupport(); return 0; }
-static int aufs_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
-{ AuUnsupport(); return 0; }
-static int aufs_writepage(struct page *page, struct writeback_control *wbc)
-{ AuUnsupport(); return 0; }
-static void aufs_sync_page(struct page *page)
-{ AuUnsupport(); }
-
-static int aufs_set_page_dirty(struct page *page)
-{ AuUnsupport(); return 0; }
-static void aufs_invalidatepage(struct page *page, unsigned long offset)
-{ AuUnsupport(); }
-static int aufs_releasepage(struct page *page, gfp_t gfp)
-{ AuUnsupport(); return 0; }
-static int aufs_migratepage(struct address_space *mapping, struct page *newpage,
- struct page *page)
-{ AuUnsupport(); return 0; }
-static int aufs_launder_page(struct page *page)
-{ AuUnsupport(); return 0; }
-static int aufs_is_partially_uptodate(struct page *page,
- read_descriptor_t *desc,
- unsigned long from)
-{ AuUnsupport(); return 0; }
-static int aufs_error_remove_page(struct address_space *mapping,
- struct page *page)
-{ AuUnsupport(); return 0; }
-#endif /* CONFIG_AUFS_DEBUG */
-
-const struct address_space_operations aufs_aop = {
- .readpage = aufs_readpage,
- .direct_IO = aufs_direct_IO,
- .get_xip_mem = aufs_get_xip_mem,
-#ifdef CONFIG_AUFS_DEBUG
- .writepage = aufs_writepage,
- .sync_page = aufs_sync_page,
- /* no writepages, because of writepage */
- .set_page_dirty = aufs_set_page_dirty,
- /* no readpages, because of readpage */
- .write_begin = aufs_write_begin,
- .write_end = aufs_write_end,
- /* no bmap, no block device */
- .invalidatepage = aufs_invalidatepage,
- .releasepage = aufs_releasepage,
- .migratepage = aufs_migratepage,
- .launder_page = aufs_launder_page,
- .is_partially_uptodate = aufs_is_partially_uptodate,
- .error_remove_page = aufs_error_remove_page
-#endif /* CONFIG_AUFS_DEBUG */
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * file operations
- */
-
-#ifndef __AUFS_FILE_H__
-#define __AUFS_FILE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/aufs_type.h>
-#include "rwsem.h"
-
-struct au_branch;
-struct au_hfile {
- struct file *hf_file;
- struct au_branch *hf_br;
-};
-
-struct au_vdir;
-struct au_fidir {
- aufs_bindex_t fd_bbot;
- aufs_bindex_t fd_nent;
- struct au_vdir *fd_vdir_cache;
- struct au_hfile fd_hfile[];
-};
-
-static inline int au_fidir_sz(int nent)
-{
- AuDebugOn(nent < 0);
- return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent;
-}
-
-struct au_finfo {
- atomic_t fi_generation;
-
- struct au_rwsem fi_rwsem;
- aufs_bindex_t fi_btop;
-
- /* do not union them */
- struct { /* for non-dir */
- struct au_hfile fi_htop;
- struct vm_operations_struct *fi_hvmop;
- struct mutex fi_vm_mtx;
- struct mutex fi_mmap;
- };
- struct au_fidir *fi_hdir; /* for dir only */
-} ____cacheline_aligned_in_smp;
-
-/* ---------------------------------------------------------------------- */
-
-/* file.c */
-extern const struct address_space_operations aufs_aop;
-unsigned int au_file_roflags(unsigned int flags);
-struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
- struct file *file);
-int au_do_open(struct file *file, int (*open)(struct file *file, int flags),
- struct au_fidir *fidir);
-int au_reopen_nondir(struct file *file);
-struct au_pin;
-int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin);
-int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
- int wlock);
-int au_do_flush(struct file *file, fl_owner_t id,
- int (*flush)(struct file *file, fl_owner_t id));
-
-/* poll.c */
-#ifdef CONFIG_AUFS_POLL
-unsigned int aufs_poll(struct file *file, poll_table *wait);
-#endif
-
-#ifdef CONFIG_AUFS_BR_HFSPLUS
-/* hfsplus.c */
-struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex);
-void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
- struct file *h_file);
-#else
-static inline
-struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex)
-{
- return NULL;
-}
-
-AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex,
- struct file *h_file);
-#endif
-
-/* f_op.c */
-extern const struct file_operations aufs_file_fop;
-extern const struct vm_operations_struct aufs_vm_ops;
-int au_do_open_nondir(struct file *file, int flags);
-int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file);
-
-#ifdef CONFIG_AUFS_SP_IATTR
-/* f_op_sp.c */
-int au_special_file(umode_t mode);
-void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev);
-#else
-AuStubInt0(au_special_file, umode_t mode)
-static inline void au_init_special_fop(struct inode *inode, umode_t mode,
- dev_t rdev)
-{
- init_special_inode(inode, mode, rdev);
-}
-#endif
-
-/* finfo.c */
-void au_hfput(struct au_hfile *hf, struct file *file);
-void au_set_h_fptr(struct file *file, aufs_bindex_t bindex,
- struct file *h_file);
-
-void au_update_figen(struct file *file);
-void au_fi_mmap_lock(struct file *file);
-void au_fi_mmap_unlock(struct file *file);
-struct au_fidir *au_fidir_alloc(struct super_block *sb);
-int au_fidir_realloc(struct au_finfo *finfo, int nbr);
-
-void au_fi_init_once(void *_fi);
-void au_finfo_fin(struct file *file);
-int au_finfo_init(struct file *file, struct au_fidir *fidir);
-
-/* ioctl.c */
-long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_finfo *au_fi(struct file *file)
-{
- return file->private_data;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * fi_read_lock, fi_write_lock,
- * fi_read_unlock, fi_write_unlock, fi_downgrade_lock
- */
-AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem);
-
-#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem)
-#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem)
-#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: hard/soft set? */
-static inline aufs_bindex_t au_fbstart(struct file *file)
-{
- FiMustAnyLock(file);
- return au_fi(file)->fi_btop;
-}
-
-static inline aufs_bindex_t au_fbend_dir(struct file *file)
-{
- FiMustAnyLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- return au_fi(file)->fi_hdir->fd_bbot;
-}
-
-static inline struct au_vdir *au_fvdir_cache(struct file *file)
-{
- FiMustAnyLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- return au_fi(file)->fi_hdir->fd_vdir_cache;
-}
-
-static inline void au_set_fbstart(struct file *file, aufs_bindex_t bindex)
-{
- FiMustWriteLock(file);
- au_fi(file)->fi_btop = bindex;
-}
-
-static inline void au_set_fbend_dir(struct file *file, aufs_bindex_t bindex)
-{
- FiMustWriteLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- au_fi(file)->fi_hdir->fd_bbot = bindex;
-}
-
-static inline void au_set_fvdir_cache(struct file *file,
- struct au_vdir *vdir_cache)
-{
- FiMustWriteLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache;
-}
-
-static inline struct file *au_hf_top(struct file *file)
-{
- FiMustAnyLock(file);
- AuDebugOn(au_fi(file)->fi_hdir);
- return au_fi(file)->fi_htop.hf_file;
-}
-
-static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex)
-{
- FiMustAnyLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file;
-}
-
-/* todo: memory barrier? */
-static inline unsigned int au_figen(struct file *f)
-{
- return atomic_read(&au_fi(f)->fi_generation);
-}
-
-static inline int au_test_mmapped(struct file *f)
-{
- FiMustAnyLock(f);
- return !!(au_fi(f)->fi_hvmop);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_FILE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * file private data
- */
-
-#include <linux/file.h>
-#include "aufs.h"
-
-void au_hfput(struct au_hfile *hf, struct file *file)
-{
- /* todo: direct access f_flags */
- if (vfsub_file_flags(file) & vfsub_fmode_to_uint(FMODE_EXEC))
- allow_write_access(hf->hf_file);
- fput(hf->hf_file);
- hf->hf_file = NULL;
- atomic_dec_return(&hf->hf_br->br_count);
- hf->hf_br = NULL;
-}
-
-void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
-{
- struct au_finfo *finfo = au_fi(file);
- struct au_hfile *hf;
- struct au_fidir *fidir;
-
- fidir = finfo->fi_hdir;
- if (!fidir) {
- AuDebugOn(finfo->fi_btop != bindex);
- hf = &finfo->fi_htop;
- } else
- hf = fidir->fd_hfile + bindex;
-
- if (hf && hf->hf_file)
- au_hfput(hf, file);
- if (val) {
- FiMustWriteLock(file);
- hf->hf_file = val;
- hf->hf_br = au_sbr(file->f_dentry->d_sb, bindex);
- }
-}
-
-void au_update_figen(struct file *file)
-{
- atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_dentry));
- /* smp_mb(); */ /* atomic_set */
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_fi_mmap_lock(struct file *file)
-{
- FiMustWriteLock(file);
- lockdep_off();
- mutex_lock(&au_fi(file)->fi_mmap);
- lockdep_on();
-}
-
-void au_fi_mmap_unlock(struct file *file)
-{
- lockdep_off();
- mutex_unlock(&au_fi(file)->fi_mmap);
- lockdep_on();
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_fidir *au_fidir_alloc(struct super_block *sb)
-{
- struct au_fidir *fidir;
- int nbr;
-
- nbr = au_sbend(sb) + 1;
- if (nbr < 2)
- nbr = 2; /* initial allocate for 2 branches */
- fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS);
- if (fidir) {
- fidir->fd_bbot = -1;
- fidir->fd_nent = nbr;
- fidir->fd_vdir_cache = NULL;
- }
-
- return fidir;
-}
-
-int au_fidir_realloc(struct au_finfo *finfo, int nbr)
-{
- int err;
- struct au_fidir *fidir, *p;
-
- AuRwMustWriteLock(&finfo->fi_rwsem);
- fidir = finfo->fi_hdir;
- AuDebugOn(!fidir);
-
- err = -ENOMEM;
- p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr),
- GFP_NOFS);
- if (p) {
- p->fd_nent = nbr;
- finfo->fi_hdir = p;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_finfo_fin(struct file *file)
-{
- struct au_finfo *finfo;
-
- finfo = au_fi(file);
- AuDebugOn(finfo->fi_hdir);
- AuRwDestroy(&finfo->fi_rwsem);
- au_cache_free_finfo(finfo);
-}
-
-void au_fi_init_once(void *_fi)
-{
- struct au_finfo *fi = _fi;
-
- au_rw_init(&fi->fi_rwsem);
- mutex_init(&fi->fi_vm_mtx);
- mutex_init(&fi->fi_mmap);
-}
-
-int au_finfo_init(struct file *file, struct au_fidir *fidir)
-{
- int err;
- struct au_finfo *finfo;
- struct dentry *dentry;
-
- err = -ENOMEM;
- dentry = file->f_dentry;
- finfo = au_cache_alloc_finfo();
- if (unlikely(!finfo))
- goto out;
-
- err = 0;
- au_rw_write_lock(&finfo->fi_rwsem);
- finfo->fi_btop = -1;
- finfo->fi_hdir = fidir;
- atomic_set(&finfo->fi_generation, au_digen(dentry));
- /* smp_mb(); */ /* atomic_set */
-
- file->private_data = finfo;
-
-out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * judging filesystem type
- */
-
-#ifndef __AUFS_FSTYPE_H__
-#define __AUFS_FSTYPE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/magic.h>
-#include <linux/romfs_fs.h>
-#include <linux/aufs_type.h>
-
-static inline int au_test_aufs(struct super_block *sb)
-{
- return sb->s_magic == AUFS_SUPER_MAGIC;
-}
-
-static inline const char *au_sbtype(struct super_block *sb)
-{
- return sb->s_type->name;
-}
-
-static inline int au_test_iso9660(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_ROMFS_FS) || defined(CONFIG_ROMFS_FS_MODULE)
- return sb->s_magic == ROMFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_romfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_ISO9660_FS) || defined(CONFIG_ISO9660_FS_MODULE)
- return sb->s_magic == ISOFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_cramfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_CRAMFS) || defined(CONFIG_CRAMFS_MODULE)
- return sb->s_magic == CRAMFS_MAGIC;
-#endif
- return 0;
-}
-
-static inline int au_test_nfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE)
- return sb->s_magic == NFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_fuse(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_FUSE_FS) || defined(CONFIG_FUSE_FS_MODULE)
- return sb->s_magic == FUSE_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_xfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_XFS_FS) || defined(CONFIG_XFS_FS_MODULE)
- return sb->s_magic == XFS_SB_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_tmpfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_TMPFS
- return sb->s_magic == TMPFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_ECRYPT_FS) || defined(CONFIG_ECRYPT_FS_MODULE)
- return !strcmp(au_sbtype(sb), "ecryptfs");
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_smbfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_SMB_FS) || defined(CONFIG_SMB_FS_MODULE)
- return sb->s_magic == SMB_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ocfs2(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_OCFS2_FS) || defined(CONFIG_OCFS2_FS_MODULE)
- return sb->s_magic == OCFS2_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ocfs2_dlmfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_OCFS2_FS_O2CB) || defined(CONFIG_OCFS2_FS_O2CB_MODULE)
- return sb->s_magic == DLMFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_coda(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_CODA_FS) || defined(CONFIG_CODA_FS_MODULE)
- return sb->s_magic == CODA_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_v9fs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_9P_FS) || defined(CONFIG_9P_FS_MODULE)
- return sb->s_magic == V9FS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ext4(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_EXT4DEV_FS) || defined(CONFIG_EXT4DEV_FS_MODULE)
- return sb->s_magic == EXT4_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_sysv(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_SYSV_FS) || defined(CONFIG_SYSV_FS_MODULE)
- return !strcmp(au_sbtype(sb), "sysv");
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ramfs(struct super_block *sb)
-{
- return sb->s_magic == RAMFS_MAGIC;
-}
-
-static inline int au_test_ubifs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_UBIFS_FS) || defined(CONFIG_UBIFS_FS_MODULE)
- return sb->s_magic == UBIFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_procfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_PROC_FS
- return sb->s_magic == PROC_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_sysfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_SYSFS
- return sb->s_magic == SYSFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_configfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_CONFIGFS_FS) || defined(CONFIG_CONFIGFS_FS_MODULE)
- return sb->s_magic == CONFIGFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_minix(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_MINIX_FS) || defined(CONFIG_MINIX_FS_MODULE)
- return sb->s_magic == MINIX3_SUPER_MAGIC
- || sb->s_magic == MINIX2_SUPER_MAGIC
- || sb->s_magic == MINIX2_SUPER_MAGIC2
- || sb->s_magic == MINIX_SUPER_MAGIC
- || sb->s_magic == MINIX_SUPER_MAGIC2;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_cifs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_CIFS_FS) || defined(CONFIGCIFS_FS_MODULE)
- return sb->s_magic == CIFS_MAGIC_NUMBER;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_fat(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_FAT_FS) || defined(CONFIG_FAT_FS_MODULE)
- return sb->s_magic == MSDOS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_msdos(struct super_block *sb)
-{
- return au_test_fat(sb);
-}
-
-static inline int au_test_vfat(struct super_block *sb)
-{
- return au_test_fat(sb);
-}
-
-static inline int au_test_securityfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_SECURITYFS
- return sb->s_magic == SECURITYFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_squashfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_SQUASHFS) || defined(CONFIG_SQUASHFS_MODULE)
- return sb->s_magic == SQUASHFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_btrfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_BTRFS_FS) || defined(CONFIG_BTRFS_FS_MODULE)
- return sb->s_magic == BTRFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_xenfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_XENFS) || defined(CONFIG_XENFS_MODULE)
- return sb->s_magic == XENFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_debugfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_DEBUG_FS
- return sb->s_magic == DEBUGFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_nilfs(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_NILFS) || defined(CONFIG_NILFS_MODULE)
- return sb->s_magic == NILFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_hfsplus(struct super_block *sb __maybe_unused)
-{
-#if defined(CONFIG_HFSPLUS_FS) || defined(CONFIG_HFSPLUS_FS_MODULE)
- return sb->s_magic == HFSPLUS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * they can't be an aufs branch.
- */
-static inline int au_test_fs_unsuppoted(struct super_block *sb)
-{
- return
-#ifndef CONFIG_AUFS_BR_RAMFS
- au_test_ramfs(sb) ||
-#endif
- au_test_procfs(sb)
- || au_test_sysfs(sb)
- || au_test_configfs(sb)
- || au_test_debugfs(sb)
- || au_test_securityfs(sb)
- || au_test_xenfs(sb)
- || au_test_ecryptfs(sb)
- /* || !strcmp(au_sbtype(sb), "unionfs") */
- || au_test_aufs(sb); /* will be supported in next version */
-}
-
-/*
- * If the filesystem supports NFS-export, then it has to support NULL as
- * a nameidata parameter for ->create(), ->lookup() and ->d_revalidate().
- * We can apply this principle when we handle a lower filesystem.
- */
-static inline int au_test_fs_null_nd(struct super_block *sb)
-{
- return !!sb->s_export_op;
-}
-
-static inline int au_test_fs_remote(struct super_block *sb)
-{
- return !au_test_tmpfs(sb)
-#ifdef CONFIG_AUFS_BR_RAMFS
- && !au_test_ramfs(sb)
-#endif
- && !(sb->s_type->fs_flags & FS_REQUIRES_DEV);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * Note: these functions (below) are created after reading ->getattr() in all
- * filesystems under linux/fs. it means we have to do so in every update...
- */
-
-/*
- * some filesystems require getattr to refresh the inode attributes before
- * referencing.
- * in most cases, we can rely on the inode attribute in NFS (or every remote fs)
- * and leave the work for d_revalidate()
- */
-static inline int au_test_fs_refresh_iattr(struct super_block *sb)
-{
- return au_test_nfs(sb)
- || au_test_fuse(sb)
- /* || au_test_smbfs(sb) */ /* untested */
- /* || au_test_ocfs2(sb) */ /* untested */
- /* || au_test_btrfs(sb) */ /* untested */
- /* || au_test_coda(sb) */ /* untested */
- /* || au_test_v9fs(sb) */ /* untested */
- ;
-}
-
-/*
- * filesystems which don't maintain i_size or i_blocks.
- */
-static inline int au_test_fs_bad_iattr_size(struct super_block *sb)
-{
- return au_test_xfs(sb)
- || au_test_btrfs(sb)
- || au_test_ubifs(sb)
- || au_test_hfsplus(sb) /* maintained, but incorrect */
- /* || au_test_ext4(sb) */ /* untested */
- /* || au_test_ocfs2(sb) */ /* untested */
- /* || au_test_ocfs2_dlmfs(sb) */ /* untested */
- /* || au_test_sysv(sb) */ /* untested */
- /* || au_test_minix(sb) */ /* untested */
- ;
-}
-
-/*
- * filesystems which don't store the correct value in some of their inode
- * attributes.
- */
-static inline int au_test_fs_bad_iattr(struct super_block *sb)
-{
- return au_test_fs_bad_iattr_size(sb)
- /* || au_test_cifs(sb) */ /* untested */
- || au_test_fat(sb)
- || au_test_msdos(sb)
- || au_test_vfat(sb);
-}
-
-/* they don't check i_nlink in link(2) */
-static inline int au_test_fs_no_limit_nlink(struct super_block *sb)
-{
- return au_test_tmpfs(sb)
-#ifdef CONFIG_AUFS_BR_RAMFS
- || au_test_ramfs(sb)
-#endif
- || au_test_ubifs(sb)
- || au_test_btrfs(sb)
- || au_test_hfsplus(sb);
-}
-
-/*
- * filesystems which sets S_NOATIME and S_NOCMTIME.
- */
-static inline int au_test_fs_notime(struct super_block *sb)
-{
- return au_test_nfs(sb)
- || au_test_fuse(sb)
- || au_test_ubifs(sb)
- /* || au_test_cifs(sb) */ /* untested */
- ;
-}
-
-/*
- * filesystems which requires replacing i_mapping.
- */
-static inline int au_test_fs_bad_mapping(struct super_block *sb)
-{
- return au_test_fuse(sb)
- || au_test_ubifs(sb);
-}
-
-/* temporary support for i#1 in cramfs */
-static inline int au_test_fs_unique_ino(struct inode *inode)
-{
- if (au_test_cramfs(inode->i_sb))
- return inode->i_ino != 1;
- return 1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * the filesystem where the xino files placed must support i/o after unlink and
- * maintain i_size and i_blocks.
- */
-static inline int au_test_fs_bad_xino(struct super_block *sb)
-{
- return au_test_fs_remote(sb)
- || au_test_fs_bad_iattr_size(sb)
-#ifdef CONFIG_AUFS_BR_RAMFS
- || !(au_test_ramfs(sb) || au_test_fs_null_nd(sb))
-#else
- || !au_test_fs_null_nd(sb) /* to keep xino code simple */
-#endif
- /* don't want unnecessary work for xino */
- || au_test_aufs(sb)
- || au_test_ecryptfs(sb)
- || au_test_nilfs(sb);
-}
-
-static inline int au_test_fs_trunc_xino(struct super_block *sb)
-{
- return au_test_tmpfs(sb)
- || au_test_ramfs(sb);
-}
-
-/*
- * test if the @sb is real-readonly.
- */
-static inline int au_test_fs_rr(struct super_block *sb)
-{
- return au_test_squashfs(sb)
- || au_test_iso9660(sb)
- || au_test_cramfs(sb)
- || au_test_romfs(sb);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_FSTYPE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * fsnotify for the lower directories
- */
-
-#include "aufs.h"
-
-/* FS_IN_IGNORED is unnecessary */
-static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE
- | FS_CREATE | FS_EVENT_ON_CHILD);
-static struct fsnotify_group *au_hfsn_group;
-
-static void au_hfsn_free_mark(struct fsnotify_mark_entry *entry)
-{
-#if 0
- struct au_hnotify *hn = container_of(entry, struct au_hnotify,
- hn_entry);
- au_cache_free_hnotify(hn);
-#endif
- AuDbg("here\n");
-}
-
-static int au_hfsn_alloc(struct au_hnotify *hn, struct inode *h_inode)
-{
- struct fsnotify_mark_entry *entry;
-
- entry = &hn->hn_entry;
- fsnotify_init_mark(entry, au_hfsn_free_mark);
- entry->mask = AuHfsnMask;
- return fsnotify_add_mark(entry, au_hfsn_group, h_inode);
-}
-
-static void au_hfsn_free(struct au_hnotify *hn)
-{
- struct fsnotify_mark_entry *entry;
-
- entry = &hn->hn_entry;
- fsnotify_destroy_mark_by_entry(entry);
- fsnotify_put_mark(entry);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_hfsn_ctl(struct au_hinode *hinode, int do_set)
-{
- struct fsnotify_mark_entry *entry;
-
- entry = &hinode->hi_notify->hn_entry;
- spin_lock(&entry->lock);
- if (do_set) {
- AuDebugOn(entry->mask & AuHfsnMask);
- entry->mask |= AuHfsnMask;
- } else {
- AuDebugOn(!(entry->mask & AuHfsnMask));
- entry->mask &= ~AuHfsnMask;
- }
- spin_unlock(&entry->lock);
- /* fsnotify_recalc_inode_mask(hinode->hi_inode); */
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* #define AuDbgHnotify */
-#ifdef AuDbgHnotify
-static char *au_hfsn_name(u32 mask)
-{
-#ifdef CONFIG_AUFS_DEBUG
-#define test_ret(flag) if (mask & flag) \
- return #flag;
- test_ret(FS_ACCESS);
- test_ret(FS_MODIFY);
- test_ret(FS_ATTRIB);
- test_ret(FS_CLOSE_WRITE);
- test_ret(FS_CLOSE_NOWRITE);
- test_ret(FS_OPEN);
- test_ret(FS_MOVED_FROM);
- test_ret(FS_MOVED_TO);
- test_ret(FS_CREATE);
- test_ret(FS_DELETE);
- test_ret(FS_DELETE_SELF);
- test_ret(FS_MOVE_SELF);
- test_ret(FS_UNMOUNT);
- test_ret(FS_Q_OVERFLOW);
- test_ret(FS_IN_IGNORED);
- test_ret(FS_IN_ISDIR);
- test_ret(FS_IN_ONESHOT);
- test_ret(FS_EVENT_ON_CHILD);
- return "";
-#undef test_ret
-#else
- return "??";
-#endif
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static int au_hfsn_handle_event(struct fsnotify_group *group,
- struct fsnotify_event *event)
-{
- int err;
- struct au_hnotify *hnotify;
- struct inode *h_dir, *h_inode;
- __u32 mask;
- struct fsnotify_mark_entry *entry;
- struct qstr h_child_qstr = {
- .name = event->file_name,
- .len = event->name_len
- };
-
- AuDebugOn(event->data_type != FSNOTIFY_EVENT_INODE);
-
- err = 0;
- /* if IN_UNMOUNT happens, there must be another bug */
- mask = event->mask;
- AuDebugOn(mask & FS_UNMOUNT);
- if (mask & (IN_IGNORED | IN_UNMOUNT))
- goto out;
-
- h_dir = event->to_tell;
- h_inode = event->inode;
-#ifdef AuDbgHnotify
- au_debug(1);
- if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1
- || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) {
- AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n",
- h_dir->i_ino, mask, au_hfsn_name(mask),
- AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0);
- /* WARN_ON(1); */
- }
- au_debug(0);
-#endif
-
- spin_lock(&h_dir->i_lock);
- entry = fsnotify_find_mark_entry(group, h_dir);
- spin_unlock(&h_dir->i_lock);
- if (entry) {
- hnotify = container_of(entry, struct au_hnotify, hn_entry);
- err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode);
- fsnotify_put_mark(entry);
- }
-
-out:
- return err;
-}
-
-/* copied from linux/fs/notify/inotify/inotify_fsnotiry.c */
-/* it should be exported to modules */
-static bool au_hfsn_should_send_event(struct fsnotify_group *group,
- struct inode *h_inode, __u32 mask)
-{
- struct fsnotify_mark_entry *entry;
- bool send;
-
- spin_lock(&h_inode->i_lock);
- entry = fsnotify_find_mark_entry(group, h_inode);
- spin_unlock(&h_inode->i_lock);
- if (!entry)
- return false;
-
- mask = (mask & ~FS_EVENT_ON_CHILD);
- send = (entry->mask & mask);
-
- /* find took a reference */
- fsnotify_put_mark(entry);
-
- return send;
-}
-
-static struct fsnotify_ops au_hfsn_ops = {
- .should_send_event = au_hfsn_should_send_event,
- .handle_event = au_hfsn_handle_event
-};
-
-/* ---------------------------------------------------------------------- */
-
-static int __init au_hfsn_init(void)
-{
- int err;
- unsigned int gn;
- const unsigned int gn_max = 10;
-
- gn = 0;
- for (gn = 0; gn < gn_max; gn++) {
- au_hfsn_group = fsnotify_obtain_group(gn, AuHfsnMask,
- &au_hfsn_ops);
- if (au_hfsn_group != ERR_PTR(-EEXIST))
- break;
- }
-
- err = 0;
- if (IS_ERR(au_hfsn_group)) {
- pr_err("fsnotify_obtain_group() failed %u times\n", gn_max);
- err = PTR_ERR(au_hfsn_group);
- }
-
- AuTraceErr(err);
- return err;
-}
-
-static void au_hfsn_fin(void)
-{
- fsnotify_put_group(au_hfsn_group);
-}
-
-const struct au_hnotify_op au_hnotify_op = {
- .ctl = au_hfsn_ctl,
- .alloc = au_hfsn_alloc,
- .free = au_hfsn_free,
-
- .fin = au_hfsn_fin,
- .init = au_hfsn_init
-};
+++ /dev/null
-/*
- * Copyright (C) 2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * special support for filesystems which aqucires an inode mutex
- * at final closing a file, eg, hfsplus.
- *
- * This trick is very simple and stupid, just to open the file before really
- * neceeary open to tell hfsplus that this is not the final closing.
- * The caller should call au_h_open_pre() after acquiring the inode mutex,
- * and au_h_open_post() after releasing it.
- */
-
-#include <linux/file.h>
-#include "aufs.h"
-
-struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex)
-{
- struct file *h_file;
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- AuDebugOn(!h_dentry);
- AuDebugOn(!h_dentry->d_inode);
- IMustLock(h_dentry->d_inode);
-
- h_file = NULL;
- if (au_test_hfsplus(h_dentry->d_sb)
- && S_ISREG(h_dentry->d_inode->i_mode))
- h_file = au_h_open(dentry, bindex,
- O_RDONLY | O_NOATIME | O_LARGEFILE,
- /*file*/NULL);
- return h_file;
-}
-
-void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
- struct file *h_file)
-{
- if (h_file) {
- fput(h_file);
- au_sbr_put(dentry->d_sb, bindex);
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inotify for the lower directories (deprecated)
- */
-
-#include "aufs.h"
-
-static const __u32 AuHinMask = (IN_MOVE | IN_DELETE | IN_CREATE);
-static struct inotify_handle *au_hin_handle;
-
-/* ---------------------------------------------------------------------- */
-
-static int au_hin_alloc(struct au_hnotify *hn, struct inode *h_inode)
-{
- int err;
- s32 wd;
- struct inotify_watch *watch;
-
- err = -EEXIST;
- wd = inotify_find_watch(au_hin_handle, h_inode, &watch);
- if (wd >= 0) {
- put_inotify_watch(watch);
- goto out;
- }
-
- err = 0;
- inotify_init_watch(&hn->hn_watch);
- wd = inotify_add_watch(au_hin_handle, &hn->hn_watch, h_inode,
- AuHinMask);
- if (unlikely(wd < 0)) {
- err = wd;
- put_inotify_watch(&hn->hn_watch);
- }
-
-out:
- return err;
-}
-
-static void au_hin_free(struct au_hnotify *hn)
-{
- int err;
-
- err = 0;
- if (atomic_read(&hn->hn_watch.count))
- err = inotify_rm_watch(au_hin_handle, &hn->hn_watch);
- if (unlikely(err))
- /* it means the watch is already removed */
- pr_warning("failed inotify_rm_watch() %d\n", err);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_hin_ctl(struct au_hinode *hinode, int do_set)
-{
- struct inode *h_inode;
- struct inotify_watch *watch;
-
- h_inode = hinode->hi_inode;
- IMustLock(h_inode);
-
- /* todo: try inotify_find_update_watch()? */
- watch = &hinode->hi_notify->hn_watch;
- mutex_lock(&h_inode->inotify_mutex);
- /* mutex_lock(&watch->ih->mutex); */
- if (do_set) {
- AuDebugOn(watch->mask & AuHinMask);
- watch->mask |= AuHinMask;
- } else {
- AuDebugOn(!(watch->mask & AuHinMask));
- watch->mask &= ~AuHinMask;
- }
- /* mutex_unlock(&watch->ih->mutex); */
- mutex_unlock(&h_inode->inotify_mutex);
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef AuDbgHnotify
-static char *in_name(u32 mask)
-{
-#ifdef CONFIG_AUFS_DEBUG
-#define test_ret(flag) if (mask & flag) \
- return #flag;
- test_ret(IN_ACCESS);
- test_ret(IN_MODIFY);
- test_ret(IN_ATTRIB);
- test_ret(IN_CLOSE_WRITE);
- test_ret(IN_CLOSE_NOWRITE);
- test_ret(IN_OPEN);
- test_ret(IN_MOVED_FROM);
- test_ret(IN_MOVED_TO);
- test_ret(IN_CREATE);
- test_ret(IN_DELETE);
- test_ret(IN_DELETE_SELF);
- test_ret(IN_MOVE_SELF);
- test_ret(IN_UNMOUNT);
- test_ret(IN_Q_OVERFLOW);
- test_ret(IN_IGNORED);
- return "";
-#undef test_ret
-#else
- return "??";
-#endif
-}
-#endif
-
-static u32 au_hin_conv_mask(u32 mask)
-{
- u32 conv;
-
- conv = 0;
-#define do_conv(flag) conv |= (mask & IN_ ## flag) ? FS_ ## flag : 0
- do_conv(ACCESS);
- do_conv(MODIFY);
- do_conv(ATTRIB);
- do_conv(CLOSE_WRITE);
- do_conv(CLOSE_NOWRITE);
- do_conv(OPEN);
- do_conv(MOVED_FROM);
- do_conv(MOVED_TO);
- do_conv(CREATE);
- do_conv(DELETE);
- do_conv(DELETE_SELF);
- do_conv(MOVE_SELF);
- do_conv(UNMOUNT);
- do_conv(Q_OVERFLOW);
-#undef do_conv
-#define do_conv(flag) conv |= (mask & IN_ ## flag) ? FS_IN_ ## flag : 0
- do_conv(IGNORED);
- /* do_conv(ISDIR); */
- /* do_conv(ONESHOT); */
-#undef do_conv
-
- return conv;
-}
-
-static void aufs_inotify(struct inotify_watch *watch, u32 wd __maybe_unused,
- u32 mask, u32 cookie __maybe_unused,
- const char *h_child_name, struct inode *h_child_inode)
-{
- struct au_hnotify *hnotify;
- struct qstr h_child_qstr = {
- .name = h_child_name
- };
-
- /* if IN_UNMOUNT happens, there must be another bug */
- AuDebugOn(mask & IN_UNMOUNT);
- if (mask & (IN_IGNORED | IN_UNMOUNT)) {
- put_inotify_watch(watch);
- return;
- }
-
-#ifdef AuDbgHnotify
- au_debug(1);
- if (1 || !h_child_name || strcmp(h_child_name, AUFS_XINO_FNAME)) {
- AuDbg("i%lu, wd %d, mask 0x%x %s, cookie 0x%x, hcname %s,"
- " hi%lu\n",
- watch->inode->i_ino, wd, mask, in_name(mask), cookie,
- h_child_name ? h_child_name : "",
- h_child_inode ? h_child_inode->i_ino : 0);
- WARN_ON(1);
- }
- au_debug(0);
-#endif
-
- if (h_child_name)
- h_child_qstr.len = strlen(h_child_name);
- hnotify = container_of(watch, struct au_hnotify, hn_watch);
- mask = au_hin_conv_mask(mask);
- au_hnotify(watch->inode, hnotify, mask, &h_child_qstr, h_child_inode);
-}
-
-static void aufs_inotify_destroy(struct inotify_watch *watch __maybe_unused)
-{
- return;
-}
-
-static struct inotify_operations aufs_inotify_ops = {
- .handle_event = aufs_inotify,
- .destroy_watch = aufs_inotify_destroy
-};
-
-/* ---------------------------------------------------------------------- */
-
-static int __init au_hin_init(void)
-{
- int err;
-
- err = 0;
- au_hin_handle = inotify_init(&aufs_inotify_ops);
- if (IS_ERR(au_hin_handle))
- err = PTR_ERR(au_hin_handle);
-
- AuTraceErr(err);
- return err;
-}
-
-static void au_hin_fin(void)
-{
- inotify_destroy(au_hin_handle);
-}
-
-const struct au_hnotify_op au_hnotify_op = {
- .ctl = au_hin_ctl,
- .alloc = au_hin_alloc,
- .free = au_hin_free,
-
- .fin = au_hin_fin,
- .init = au_hin_init
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * abstraction to notify the direct changes on lower directories
- */
-
-#include "aufs.h"
-
-int au_hn_alloc(struct au_hinode *hinode, struct inode *inode,
- struct inode *h_inode)
-{
- int err;
- struct au_hnotify *hn;
-
- err = -ENOMEM;
- hn = au_cache_alloc_hnotify();
- if (hn) {
- hn->hn_aufs_inode = inode;
- err = au_hnotify_op.alloc(hn, h_inode);
- if (!err)
- hinode->hi_notify = hn;
- else {
- au_cache_free_hnotify(hn);
- /*
- * The upper dir was removed by udba, but the same named
- * dir left. In this case, aufs assignes a new inode
- * number and set the monitor again.
- * For the lower dir, the old monitnor is still left.
- */
- if (err == -EEXIST)
- err = 0;
- }
- }
-
- return err;
-}
-
-void au_hn_free(struct au_hinode *hinode)
-{
- struct au_hnotify *hn;
-
- hn = hinode->hi_notify;
- if (hn) {
- au_hnotify_op.free(hn);
- au_cache_free_hnotify(hn);
- hinode->hi_notify = NULL;
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_hn_ctl(struct au_hinode *hinode, int do_set)
-{
- if (hinode->hi_notify)
- au_hnotify_op.ctl(hinode, do_set);
-}
-
-void au_hn_reset(struct inode *inode, unsigned int flags)
-{
- aufs_bindex_t bindex, bend;
- struct inode *hi;
- struct dentry *iwhdentry;
-
- bend = au_ibend(inode);
- for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
- hi = au_h_iptr(inode, bindex);
- if (!hi)
- continue;
-
- /* mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD); */
- iwhdentry = au_hi_wh(inode, bindex);
- if (iwhdentry)
- dget(iwhdentry);
- au_igrab(hi);
- au_set_h_iptr(inode, bindex, NULL, 0);
- au_set_h_iptr(inode, bindex, au_igrab(hi),
- flags & ~AuHi_XINO);
- iput(hi);
- dput(iwhdentry);
- /* mutex_unlock(&hi->i_mutex); */
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int hn_xino(struct inode *inode, struct inode *h_inode)
-{
- int err;
- aufs_bindex_t bindex, bend, bfound, bstart;
- struct inode *h_i;
-
- err = 0;
- if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
- pr_warning("branch root dir was changed\n");
- goto out;
- }
-
- bfound = -1;
- bend = au_ibend(inode);
- bstart = au_ibstart(inode);
-#if 0 /* reserved for future use */
- if (bindex == bend) {
- /* keep this ino in rename case */
- goto out;
- }
-#endif
- for (bindex = bstart; bindex <= bend; bindex++)
- if (au_h_iptr(inode, bindex) == h_inode) {
- bfound = bindex;
- break;
- }
- if (bfound < 0)
- goto out;
-
- for (bindex = bstart; bindex <= bend; bindex++) {
- h_i = au_h_iptr(inode, bindex);
- if (!h_i)
- continue;
-
- err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0);
- /* ignore this error */
- /* bad action? */
- }
-
- /* children inode number will be broken */
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-static int hn_gen_tree(struct dentry *dentry)
-{
- int err, i, j, ndentry;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_dcsub_pages(&dpages, dentry, NULL, NULL);
- if (unlikely(err))
- goto out_dpages;
-
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++) {
- struct dentry *d;
-
- d = dentries[j];
- if (IS_ROOT(d))
- continue;
-
- d_drop(d);
- au_digen_dec(d);
- if (d->d_inode)
- /* todo: reset children xino?
- cached children only? */
- au_iigen_dec(d->d_inode);
- }
- }
-
- out_dpages:
- au_dpages_free(&dpages);
-
- /* discard children */
- dentry_unhash(dentry);
- dput(dentry);
- out:
- return err;
-}
-
-/*
- * return 0 if processed.
- */
-static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode,
- const unsigned int isdir)
-{
- int err;
- struct dentry *d;
- struct qstr *dname;
-
- err = 1;
- if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
- pr_warning("branch root dir was changed\n");
- err = 0;
- goto out;
- }
-
- if (!isdir) {
- AuDebugOn(!name);
- au_iigen_dec(inode);
- spin_lock(&dcache_lock);
- list_for_each_entry(d, &inode->i_dentry, d_alias) {
- dname = &d->d_name;
- if (dname->len != nlen
- && memcmp(dname->name, name, nlen))
- continue;
- err = 0;
- spin_lock(&d->d_lock);
- __d_drop(d);
- au_digen_dec(d);
- spin_unlock(&d->d_lock);
- break;
- }
- spin_unlock(&dcache_lock);
- } else {
- au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIRS);
- d = d_find_alias(inode);
- if (!d) {
- au_iigen_dec(inode);
- goto out;
- }
-
- dname = &d->d_name;
- if (dname->len == nlen && !memcmp(dname->name, name, nlen))
- err = hn_gen_tree(d);
- dput(d);
- }
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir)
-{
- int err;
- struct inode *inode;
-
- inode = dentry->d_inode;
- if (IS_ROOT(dentry)
- /* || (inode && inode->i_ino == AUFS_ROOT_INO) */
- ) {
- pr_warning("branch root dir was changed\n");
- return 0;
- }
-
- err = 0;
- if (!isdir) {
- d_drop(dentry);
- au_digen_dec(dentry);
- if (inode)
- au_iigen_dec(inode);
- } else {
- au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIRS);
- if (inode)
- err = hn_gen_tree(dentry);
- }
-
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* hnotify job flags */
-#define AuHnJob_XINO0 1
-#define AuHnJob_GEN (1 << 1)
-#define AuHnJob_DIRENT (1 << 2)
-#define AuHnJob_ISDIR (1 << 3)
-#define AuHnJob_TRYXINO0 (1 << 4)
-#define AuHnJob_MNTPNT (1 << 5)
-#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name)
-#define au_fset_hnjob(flags, name) { (flags) |= AuHnJob_##name; }
-#define au_fclr_hnjob(flags, name) { (flags) &= ~AuHnJob_##name; }
-
-enum {
- AuHn_CHILD,
- AuHn_PARENT,
- AuHnLast
-};
-
-struct au_hnotify_args {
- struct inode *h_dir, *dir, *h_child_inode;
- u32 mask;
- unsigned int flags[AuHnLast];
- unsigned int h_child_nlen;
- char h_child_name[];
-};
-
-struct hn_job_args {
- unsigned int flags;
- struct inode *inode, *h_inode, *dir, *h_dir;
- struct dentry *dentry;
- char *h_name;
- int h_nlen;
-};
-
-static int hn_job(struct hn_job_args *a)
-{
- const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR);
-
- /* reset xino */
- if (au_ftest_hnjob(a->flags, XINO0) && a->inode)
- hn_xino(a->inode, a->h_inode); /* ignore this error */
-
- if (au_ftest_hnjob(a->flags, TRYXINO0)
- && a->inode
- && a->h_inode) {
- mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
- if (!a->h_inode->i_nlink)
- hn_xino(a->inode, a->h_inode); /* ignore this error */
- mutex_unlock(&a->h_inode->i_mutex);
- }
-
- /* make the generation obsolete */
- if (au_ftest_hnjob(a->flags, GEN)) {
- int err = -1;
- if (a->inode)
- err = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode,
- isdir);
- if (err && a->dentry)
- hn_gen_by_name(a->dentry, isdir);
- /* ignore this error */
- }
-
- /* make dir entries obsolete */
- if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) {
- struct au_vdir *vdir;
-
- vdir = au_ivdir(a->inode);
- if (vdir)
- vdir->vd_jiffy = 0;
- /* IMustLock(a->inode); */
- /* a->inode->i_version++; */
- }
-
- /* can do nothing but warn */
- if (au_ftest_hnjob(a->flags, MNTPNT)
- && a->dentry
- && d_mountpoint(a->dentry))
- pr_warning("mount-point %.*s is removed or renamed\n",
- AuDLNPair(a->dentry));
-
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen,
- struct inode *dir)
-{
- struct dentry *dentry, *d, *parent;
- struct qstr *dname;
-
- parent = d_find_alias(dir);
- if (!parent)
- return NULL;
-
- dentry = NULL;
- spin_lock(&dcache_lock);
- list_for_each_entry(d, &parent->d_subdirs, d_u.d_child) {
- /* AuDbg("%.*s\n", AuDLNPair(d)); */
- dname = &d->d_name;
- if (dname->len != nlen || memcmp(dname->name, name, nlen))
- continue;
- if (!atomic_read(&d->d_count) || !d->d_fsdata) {
- spin_lock(&d->d_lock);
- __d_drop(d);
- spin_unlock(&d->d_lock);
- continue;
- }
-
- dentry = dget(d);
- break;
- }
- spin_unlock(&dcache_lock);
- dput(parent);
-
- if (dentry)
- di_write_lock_child(dentry);
-
- return dentry;
-}
-
-static struct inode *lookup_wlock_by_ino(struct super_block *sb,
- aufs_bindex_t bindex, ino_t h_ino)
-{
- struct inode *inode;
- ino_t ino;
- int err;
-
- inode = NULL;
- err = au_xino_read(sb, bindex, h_ino, &ino);
- if (!err && ino)
- inode = ilookup(sb, ino);
- if (!inode)
- goto out;
-
- if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
- pr_warning("wrong root branch\n");
- iput(inode);
- inode = NULL;
- goto out;
- }
-
- ii_write_lock_child(inode);
-
- out:
- return inode;
-}
-
-static void au_hn_bh(void *_args)
-{
- struct au_hnotify_args *a = _args;
- struct super_block *sb;
- aufs_bindex_t bindex, bend, bfound;
- unsigned char xino, try_iput;
- int err;
- struct inode *inode;
- ino_t h_ino;
- struct hn_job_args args;
- struct dentry *dentry;
- struct au_sbinfo *sbinfo;
-
- AuDebugOn(!_args);
- AuDebugOn(!a->h_dir);
- AuDebugOn(!a->dir);
- AuDebugOn(!a->mask);
- AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n",
- a->mask, a->dir->i_ino, a->h_dir->i_ino,
- a->h_child_inode ? a->h_child_inode->i_ino : 0);
-
- inode = NULL;
- dentry = NULL;
- /*
- * do not lock a->dir->i_mutex here
- * because of d_revalidate() may cause a deadlock.
- */
- sb = a->dir->i_sb;
- AuDebugOn(!sb);
- sbinfo = au_sbi(sb);
- AuDebugOn(!sbinfo);
- /* big aufs lock */
- si_noflush_write_lock(sb);
-
- ii_read_lock_parent(a->dir);
- bfound = -1;
- bend = au_ibend(a->dir);
- for (bindex = au_ibstart(a->dir); bindex <= bend; bindex++)
- if (au_h_iptr(a->dir, bindex) == a->h_dir) {
- bfound = bindex;
- break;
- }
- ii_read_unlock(a->dir);
- if (unlikely(bfound < 0))
- goto out;
-
- xino = !!au_opt_test(au_mntflags(sb), XINO);
- h_ino = 0;
- if (a->h_child_inode)
- h_ino = a->h_child_inode->i_ino;
-
- if (a->h_child_nlen
- && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN)
- || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT)))
- dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen,
- a->dir);
- try_iput = 0;
- if (dentry)
- inode = dentry->d_inode;
- if (xino && !inode && h_ino
- && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0)
- || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0)
- || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) {
- inode = lookup_wlock_by_ino(sb, bfound, h_ino);
- try_iput = 1;
- }
-
- args.flags = a->flags[AuHn_CHILD];
- args.dentry = dentry;
- args.inode = inode;
- args.h_inode = a->h_child_inode;
- args.dir = a->dir;
- args.h_dir = a->h_dir;
- args.h_name = a->h_child_name;
- args.h_nlen = a->h_child_nlen;
- err = hn_job(&args);
- if (dentry) {
- if (dentry->d_fsdata)
- di_write_unlock(dentry);
- dput(dentry);
- }
- if (inode && try_iput) {
- ii_write_unlock(inode);
- iput(inode);
- }
-
- ii_write_lock_parent(a->dir);
- args.flags = a->flags[AuHn_PARENT];
- args.dentry = NULL;
- args.inode = a->dir;
- args.h_inode = a->h_dir;
- args.dir = NULL;
- args.h_dir = NULL;
- args.h_name = NULL;
- args.h_nlen = 0;
- err = hn_job(&args);
- ii_write_unlock(a->dir);
-
- out:
- au_nwt_done(&sbinfo->si_nowait);
- si_write_unlock(sb);
-
- iput(a->h_child_inode);
- iput(a->h_dir);
- iput(a->dir);
- kfree(a);
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
- struct qstr *h_child_qstr, struct inode *h_child_inode)
-{
- int err, len;
- unsigned int flags[AuHnLast];
- unsigned char isdir, isroot, wh;
- struct inode *dir;
- struct au_hnotify_args *args;
- char *p, *h_child_name;
-
- err = 0;
- AuDebugOn(!hnotify || !hnotify->hn_aufs_inode);
- dir = igrab(hnotify->hn_aufs_inode);
- if (!dir)
- goto out;
-
- isroot = (dir->i_ino == AUFS_ROOT_INO);
- wh = 0;
- h_child_name = (void *)h_child_qstr->name;
- len = h_child_qstr->len;
- if (h_child_name) {
- if (len > AUFS_WH_PFX_LEN
- && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
- h_child_name += AUFS_WH_PFX_LEN;
- len -= AUFS_WH_PFX_LEN;
- wh = 1;
- }
- }
-
- isdir = 0;
- if (h_child_inode)
- isdir = !!S_ISDIR(h_child_inode->i_mode);
- flags[AuHn_PARENT] = AuHnJob_ISDIR;
- flags[AuHn_CHILD] = 0;
- if (isdir)
- flags[AuHn_CHILD] = AuHnJob_ISDIR;
- au_fset_hnjob(flags[AuHn_PARENT], DIRENT);
- au_fset_hnjob(flags[AuHn_CHILD], GEN);
- switch (mask & FS_EVENTS_POSS_ON_CHILD) {
- case FS_MOVED_FROM:
- case FS_MOVED_TO:
- au_fset_hnjob(flags[AuHn_CHILD], XINO0);
- au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
- /*FALLTHROUGH*/
- case FS_CREATE:
- AuDebugOn(!h_child_name || !h_child_inode);
- break;
-
- case FS_DELETE:
- /*
- * aufs never be able to get this child inode.
- * revalidation should be in d_revalidate()
- * by checking i_nlink, i_generation or d_unhashed().
- */
- AuDebugOn(!h_child_name);
- au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0);
- au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
- break;
-
- default:
- AuDebugOn(1);
- }
-
- if (wh)
- h_child_inode = NULL;
-
- err = -ENOMEM;
- /* iput() and kfree() will be called in au_hnotify() */
- /*
- * inotify_mutex is already acquired and kmalloc/prune_icache may lock
- * iprune_mutex. strange.
- */
- /* lockdep_off(); */
- args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS);
- /* lockdep_on(); */
- if (unlikely(!args)) {
- AuErr1("no memory\n");
- iput(dir);
- goto out;
- }
- args->flags[AuHn_PARENT] = flags[AuHn_PARENT];
- args->flags[AuHn_CHILD] = flags[AuHn_CHILD];
- args->mask = mask;
- args->dir = dir;
- args->h_dir = igrab(h_dir);
- if (h_child_inode)
- h_child_inode = igrab(h_child_inode); /* can be NULL */
- args->h_child_inode = h_child_inode;
- args->h_child_nlen = len;
- if (len) {
- p = (void *)args;
- p += sizeof(*args);
- memcpy(p, h_child_name, len);
- p[len] = 0;
- }
-
- /* lockdep_off(); */
- err = au_wkq_nowait(au_hn_bh, args, dir->i_sb);
- /* lockdep_on(); */
- if (unlikely(err)) {
- pr_err("wkq %d\n", err);
- iput(args->h_child_inode);
- iput(args->h_dir);
- iput(args->dir);
- kfree(args);
- }
-
-out:
- return err;
-}
-
-static void au_hn_destroy_cache(void)
-{
- kmem_cache_destroy(au_cachep[AuCache_HNOTIFY]);
- au_cachep[AuCache_HNOTIFY] = NULL;
-}
-
-int __init au_hnotify_init(void)
-{
- int err;
-
- err = -ENOMEM;
- au_cachep[AuCache_HNOTIFY] = AuCache(au_hnotify);
- if (au_cachep[AuCache_HNOTIFY]) {
- err = au_hnotify_op.init();
- if (unlikely(err))
- au_hn_destroy_cache();
- }
- AuTraceErr(err);
- return err;
-}
-
-void au_hnotify_fin(void)
-{
- au_hnotify_op.fin();
- /* cf. au_cache_fin() */
- if (au_cachep[AuCache_HNOTIFY])
- au_hn_destroy_cache();
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode operations (except add/del/rename)
- */
-
-#include <linux/device_cgroup.h>
-#include <linux/fs_stack.h>
-#include <linux/mm.h>
-#include <linux/namei.h>
-#include <linux/security.h>
-#include <linux/uaccess.h>
-#include "aufs.h"
-
-static int h_permission(struct inode *h_inode, int mask,
- struct vfsmount *h_mnt, int brperm)
-{
- int err;
- const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
-
- err = -EACCES;
- if ((write_mask && IS_IMMUTABLE(h_inode))
- || ((mask & MAY_EXEC)
- && S_ISREG(h_inode->i_mode)
- && ((h_mnt->mnt_flags & MNT_NOEXEC)
- || !(h_inode->i_mode & S_IXUGO))))
- goto out;
-
- /*
- * - skip the lower fs test in the case of write to ro branch.
- * - nfs dir permission write check is optimized, but a policy for
- * link/rename requires a real check.
- */
- if ((write_mask && !au_br_writable(brperm))
- || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode)
- && write_mask && !(mask & MAY_READ))
- || !h_inode->i_op->permission) {
- /* AuLabel(generic_permission); */
- err = generic_permission(h_inode, mask,
- h_inode->i_op->check_acl);
- } else {
- /* AuLabel(h_inode->permission); */
- err = h_inode->i_op->permission(h_inode, mask);
- AuTraceErr(err);
- }
-
- if (!err)
- err = devcgroup_inode_permission(h_inode, mask);
- if (!err) {
- mask &= (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND);
- err = security_inode_permission(h_inode, mask);
- }
-
-#if 0
- if (!err) {
- /* todo: do we need to call ima_path_check()? */
- struct path h_path = {
- .dentry =
- .mnt = h_mnt
- };
- err = ima_path_check(&h_path,
- mask & (MAY_READ | MAY_WRITE | MAY_EXEC),
- IMA_COUNT_LEAVE);
- }
-#endif
-
- out:
- return err;
-}
-
-static int aufs_permission(struct inode *inode, int mask)
-{
- int err;
- aufs_bindex_t bindex, bend;
- const unsigned char isdir = !!S_ISDIR(inode->i_mode),
- write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
- struct inode *h_inode;
- struct super_block *sb;
- struct au_branch *br;
-
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH);
- ii_read_lock_child(inode);
-
- if (!isdir || write_mask) {
- err = au_busy_or_stale();
- h_inode = au_h_iptr(inode, au_ibstart(inode));
- if (unlikely(!h_inode
- || (h_inode->i_mode & S_IFMT)
- != (inode->i_mode & S_IFMT)))
- goto out;
-
- err = 0;
- bindex = au_ibstart(inode);
- br = au_sbr(sb, bindex);
- err = h_permission(h_inode, mask, br->br_mnt, br->br_perm);
- if (write_mask
- && !err
- && !special_file(h_inode->i_mode)) {
- /* test whether the upper writable branch exists */
- err = -EROFS;
- for (; bindex >= 0; bindex--)
- if (!au_br_rdonly(au_sbr(sb, bindex))) {
- err = 0;
- break;
- }
- }
- goto out;
- }
-
- /* non-write to dir */
- err = 0;
- bend = au_ibend(inode);
- for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) {
- h_inode = au_h_iptr(inode, bindex);
- if (h_inode) {
- err = au_busy_or_stale();
- if (unlikely(!S_ISDIR(h_inode->i_mode)))
- break;
-
- br = au_sbr(sb, bindex);
- err = h_permission(h_inode, mask, br->br_mnt,
- br->br_perm);
- }
- }
-
- out:
- ii_read_unlock(inode);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
-{
- struct dentry *ret, *parent;
- struct inode *inode, *h_inode;
- struct mutex *mtx;
- struct super_block *sb;
- int err, npositive;
- aufs_bindex_t bstart;
-
- IMustLock(dir);
-
- sb = dir->i_sb;
- si_read_lock(sb, AuLock_FLUSH);
- ret = ERR_PTR(-ENAMETOOLONG);
- if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
- goto out;
- err = au_di_init(dentry);
- ret = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- parent = dentry->d_parent; /* dir inode is locked */
- di_read_lock_parent(parent, AuLock_IR);
- npositive = au_lkup_dentry(dentry, au_dbstart(parent), /*type*/0, nd);
- di_read_unlock(parent, AuLock_IR);
- err = npositive;
- ret = ERR_PTR(err);
- if (unlikely(err < 0))
- goto out_unlock;
-
- inode = NULL;
- if (npositive) {
- bstart = au_dbstart(dentry);
- h_inode = au_h_dptr(dentry, bstart)->d_inode;
- if (!S_ISDIR(h_inode->i_mode)) {
- /*
- * stop 'race'-ing between hardlinks under different
- * parents.
- */
- mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx;
- mutex_lock(mtx);
- inode = au_new_inode(dentry, /*must_new*/0);
- mutex_unlock(mtx);
- } else
- inode = au_new_inode(dentry, /*must_new*/0);
- ret = (void *)inode;
- }
- if (IS_ERR(inode))
- goto out_unlock;
-
- ret = d_splice_alias(inode, dentry);
- if (unlikely(IS_ERR(ret) && inode))
- ii_write_unlock(inode);
-
- out_unlock:
- di_write_unlock(dentry);
- out:
- si_read_unlock(sb);
- return ret;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent,
- const unsigned char add_entry, aufs_bindex_t bcpup,
- aufs_bindex_t bstart)
-{
- int err;
- struct dentry *h_parent;
- struct inode *h_dir;
-
- if (add_entry) {
- au_update_dbstart(dentry);
- IMustLock(parent->d_inode);
- } else
- di_write_lock_parent(parent);
-
- err = 0;
- if (!au_h_dptr(parent, bcpup)) {
- if (bstart < bcpup)
- err = au_cpdown_dirs(dentry, bcpup);
- else
- err = au_cpup_dirs(dentry, bcpup);
- }
- if (!err && add_entry) {
- h_parent = au_h_dptr(parent, bcpup);
- h_dir = h_parent->d_inode;
- mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
- err = au_lkup_neg(dentry, bcpup);
- /* todo: no unlock here */
- mutex_unlock(&h_dir->i_mutex);
- if (bstart < bcpup && au_dbstart(dentry) < 0) {
- au_set_dbstart(dentry, 0);
- au_update_dbrange(dentry, /*do_put_zero*/0);
- }
- }
-
- if (!add_entry)
- di_write_unlock(parent);
- if (!err)
- err = bcpup; /* success */
-
- return err;
-}
-
-/*
- * decide the branch and the parent dir where we will create a new entry.
- * returns new bindex or an error.
- * copyup the parent dir if needed.
- */
-int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
- struct au_wr_dir_args *args)
-{
- int err;
- aufs_bindex_t bcpup, bstart, src_bstart;
- const unsigned char add_entry = !!au_ftest_wrdir(args->flags,
- ADD_ENTRY);
- struct super_block *sb;
- struct dentry *parent;
- struct au_sbinfo *sbinfo;
-
- sb = dentry->d_sb;
- sbinfo = au_sbi(sb);
- parent = dget_parent(dentry);
- bstart = au_dbstart(dentry);
- bcpup = bstart;
- if (args->force_btgt < 0) {
- if (src_dentry) {
- src_bstart = au_dbstart(src_dentry);
- if (src_bstart < bstart)
- bcpup = src_bstart;
- } else if (add_entry) {
- err = AuWbrCreate(sbinfo, dentry,
- au_ftest_wrdir(args->flags, ISDIR));
- bcpup = err;
- }
-
- if (bcpup < 0 || au_test_ro(sb, bcpup, dentry->d_inode)) {
- if (add_entry)
- err = AuWbrCopyup(sbinfo, dentry);
- else {
- if (!IS_ROOT(dentry)) {
- di_read_lock_parent(parent, !AuLock_IR);
- err = AuWbrCopyup(sbinfo, dentry);
- di_read_unlock(parent, !AuLock_IR);
- } else
- err = AuWbrCopyup(sbinfo, dentry);
- }
- bcpup = err;
- if (unlikely(err < 0))
- goto out;
- }
- } else {
- bcpup = args->force_btgt;
- AuDebugOn(au_test_ro(sb, bcpup, dentry->d_inode));
- }
- AuDbg("bstart %d, bcpup %d\n", bstart, bcpup);
- err = bcpup;
- if (bcpup == bstart)
- goto out; /* success */
- else if (bstart < bcpup)
- au_update_dbrange(dentry, /*do_put_zero*/1);
-
- /* copyup the new parent into the branch we process */
- err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, bstart);
-
- out:
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *au_pinned_h_parent(struct au_pin *pin)
-{
- if (pin && pin->parent)
- return au_h_dptr(pin->parent, pin->bindex);
- return NULL;
-}
-
-void au_unpin(struct au_pin *p)
-{
- if (au_ftest_pin(p->flags, MNT_WRITE))
- mnt_drop_write(p->h_mnt);
- if (!p->hdir)
- return;
-
- au_hn_imtx_unlock(p->hdir);
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_unlock(p->parent, AuLock_IR);
- iput(p->hdir->hi_inode);
- dput(p->parent);
- p->parent = NULL;
- p->hdir = NULL;
- p->h_mnt = NULL;
-}
-
-int au_do_pin(struct au_pin *p)
-{
- int err;
- struct super_block *sb;
- struct dentry *h_dentry, *h_parent;
- struct au_branch *br;
- struct inode *h_dir;
-
- err = 0;
- sb = p->dentry->d_sb;
- br = au_sbr(sb, p->bindex);
- if (IS_ROOT(p->dentry)) {
- if (au_ftest_pin(p->flags, MNT_WRITE)) {
- p->h_mnt = br->br_mnt;
- err = mnt_want_write(p->h_mnt);
- if (unlikely(err)) {
- au_fclr_pin(p->flags, MNT_WRITE);
- goto out_err;
- }
- }
- goto out;
- }
-
- h_dentry = NULL;
- if (p->bindex <= au_dbend(p->dentry))
- h_dentry = au_h_dptr(p->dentry, p->bindex);
-
- p->parent = dget_parent(p->dentry);
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_lock(p->parent, AuLock_IR, p->lsc_di);
-
- h_dir = NULL;
- h_parent = au_h_dptr(p->parent, p->bindex);
- p->hdir = au_hi(p->parent->d_inode, p->bindex);
- if (p->hdir)
- h_dir = p->hdir->hi_inode;
-
- /* udba case */
- if (unlikely(!p->hdir || !h_dir)) {
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_unlock(p->parent, AuLock_IR);
- dput(p->parent);
- p->parent = NULL;
- goto out_err;
- }
-
- au_igrab(h_dir);
- au_hn_imtx_lock_nested(p->hdir, p->lsc_hi);
-
- if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) {
- err = -EBUSY;
- goto out_unpin;
- }
- if (h_dentry) {
- err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br);
- if (unlikely(err)) {
- au_fclr_pin(p->flags, MNT_WRITE);
- goto out_unpin;
- }
- }
-
- if (au_ftest_pin(p->flags, MNT_WRITE)) {
- p->h_mnt = br->br_mnt;
- err = mnt_want_write(p->h_mnt);
- if (unlikely(err)) {
- au_fclr_pin(p->flags, MNT_WRITE);
- goto out_unpin;
- }
- }
- goto out; /* success */
-
- out_unpin:
- au_unpin(p);
- out_err:
- pr_err("err %d\n", err);
- err = au_busy_or_stale();
- out:
- return err;
-}
-
-void au_pin_init(struct au_pin *p, struct dentry *dentry,
- aufs_bindex_t bindex, int lsc_di, int lsc_hi,
- unsigned int udba, unsigned char flags)
-{
- p->dentry = dentry;
- p->udba = udba;
- p->lsc_di = lsc_di;
- p->lsc_hi = lsc_hi;
- p->flags = flags;
- p->bindex = bindex;
-
- p->parent = NULL;
- p->hdir = NULL;
- p->h_mnt = NULL;
-}
-
-int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int udba, unsigned char flags)
-{
- au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2,
- udba, flags);
- return au_do_pin(pin);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * ->setattr() and ->getattr() are called in various cases.
- * chmod, stat: dentry is revalidated.
- * fchmod, fstat: file and dentry are not revalidated, additionally they may be
- * unhashed.
- * for ->setattr(), ia->ia_file is passed from ftruncate only.
- */
-static int au_reval_for_attr(struct dentry *dentry, unsigned int sigen)
-{
- int err;
- struct inode *inode;
- struct dentry *parent;
-
- err = 0;
- inode = dentry->d_inode;
- if (au_digen(dentry) != sigen || au_iigen(inode) != sigen) {
- parent = dget_parent(dentry);
- di_read_lock_parent(parent, AuLock_IR);
- /* returns a number of positive dentries */
- err = au_refresh_hdentry(dentry, inode->i_mode & S_IFMT);
- if (err >= 0)
- err = au_refresh_hinode(inode, dentry);
- di_read_unlock(parent, AuLock_IR);
- dput(parent);
- }
-
- AuTraceErr(err);
- return err;
-}
-
-#define AuIcpup_DID_CPUP 1
-#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name)
-#define au_fset_icpup(flags, name) { (flags) |= AuIcpup_##name; }
-#define au_fclr_icpup(flags, name) { (flags) &= ~AuIcpup_##name; }
-
-struct au_icpup_args {
- unsigned char flags;
- unsigned char pin_flags;
- aufs_bindex_t btgt;
- unsigned int udba;
- struct au_pin pin;
- struct path h_path;
- struct inode *h_inode;
-};
-
-static int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
- struct au_icpup_args *a)
-{
- int err;
- loff_t sz;
- aufs_bindex_t bstart;
- struct dentry *hi_wh, *parent;
- struct inode *inode;
- struct file *h_file;
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = 0
- };
-
- bstart = au_dbstart(dentry);
- inode = dentry->d_inode;
- if (S_ISDIR(inode->i_mode))
- au_fset_wrdir(wr_dir_args.flags, ISDIR);
- /* plink or hi_wh() case */
- if (bstart != au_ibstart(inode))
- wr_dir_args.force_btgt = au_ibstart(inode);
- err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
- if (unlikely(err < 0))
- goto out;
- a->btgt = err;
- if (err != bstart)
- au_fset_icpup(a->flags, DID_CPUP);
-
- err = 0;
- a->pin_flags = AuPin_MNT_WRITE;
- parent = NULL;
- if (!IS_ROOT(dentry)) {
- au_fset_pin(a->pin_flags, DI_LOCKED);
- parent = dget_parent(dentry);
- di_write_lock_parent(parent);
- }
-
- err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags);
- if (unlikely(err))
- goto out_parent;
-
- a->h_path.dentry = au_h_dptr(dentry, bstart);
- a->h_inode = a->h_path.dentry->d_inode;
- mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
- sz = -1;
- if ((ia->ia_valid & ATTR_SIZE) && ia->ia_size < i_size_read(a->h_inode))
- sz = ia->ia_size;
-
- h_file = NULL;
- hi_wh = NULL;
- if (au_ftest_icpup(a->flags, DID_CPUP) && d_unhashed(dentry)) {
- hi_wh = au_hi_wh(inode, a->btgt);
- if (!hi_wh) {
- err = au_sio_cpup_wh(dentry, a->btgt, sz, /*file*/NULL);
- if (unlikely(err))
- goto out_unlock;
- hi_wh = au_hi_wh(inode, a->btgt);
- /* todo: revalidate hi_wh? */
- }
- }
-
- if (parent) {
- au_pin_set_parent_lflag(&a->pin, /*lflag*/0);
- di_downgrade_lock(parent, AuLock_IR);
- dput(parent);
- parent = NULL;
- }
- if (!au_ftest_icpup(a->flags, DID_CPUP))
- goto out; /* success */
-
- if (!d_unhashed(dentry)) {
- h_file = au_h_open_pre(dentry, bstart);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- h_file = NULL;
- } else
- err = au_sio_cpup_simple(dentry, a->btgt, sz,
- AuCpup_DTIME);
- if (!err)
- a->h_path.dentry = au_h_dptr(dentry, a->btgt);
- } else if (!hi_wh)
- a->h_path.dentry = au_h_dptr(dentry, a->btgt);
- else
- a->h_path.dentry = hi_wh; /* do not dget here */
-
- out_unlock:
- mutex_unlock(&a->h_inode->i_mutex);
- au_h_open_post(dentry, bstart, h_file);
- a->h_inode = a->h_path.dentry->d_inode;
- if (!err) {
- mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
- goto out; /* success */
- }
-
- au_unpin(&a->pin);
- out_parent:
- if (parent) {
- di_write_unlock(parent);
- dput(parent);
- }
- out:
- return err;
-}
-
-static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
-{
- int err;
- struct inode *inode;
- struct super_block *sb;
- struct file *file;
- struct au_icpup_args *a;
-
- inode = dentry->d_inode;
- IMustLock(inode);
-
- err = -ENOMEM;
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
- ia->ia_valid &= ~ATTR_MODE;
-
- file = NULL;
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- if (ia->ia_valid & ATTR_FILE) {
- /* currently ftruncate(2) only */
- AuDebugOn(!S_ISREG(inode->i_mode));
- file = ia->ia_file;
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out_si;
- ia->ia_file = au_hf_top(file);
- a->udba = AuOpt_UDBA_NONE;
- } else {
- /* fchmod() doesn't pass ia_file */
- a->udba = au_opt_udba(sb);
- if (d_unhashed(dentry))
- a->udba = AuOpt_UDBA_NONE;
- di_write_lock_child(dentry);
- if (a->udba != AuOpt_UDBA_NONE) {
- AuDebugOn(IS_ROOT(dentry));
- err = au_reval_for_attr(dentry, au_sigen(sb));
- if (unlikely(err))
- goto out_dentry;
- }
- }
-
- err = au_pin_and_icpup(dentry, ia, a);
- if (unlikely(err < 0))
- goto out_dentry;
- if (au_ftest_icpup(a->flags, DID_CPUP)) {
- ia->ia_file = NULL;
- ia->ia_valid &= ~ATTR_FILE;
- }
-
- a->h_path.mnt = au_sbr_mnt(sb, a->btgt);
- if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME))
- == (ATTR_MODE | ATTR_CTIME)) {
- err = security_path_chmod(a->h_path.dentry, a->h_path.mnt,
- ia->ia_mode);
- if (unlikely(err))
- goto out_unlock;
- } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID))
- && (ia->ia_valid & ATTR_CTIME)) {
- err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid);
- if (unlikely(err))
- goto out_unlock;
- }
-
- if (ia->ia_valid & ATTR_SIZE) {
- struct file *f;
-
- if (ia->ia_size < i_size_read(inode)) {
- /* unmap only */
- err = vmtruncate(inode, ia->ia_size);
- if (unlikely(err))
- goto out_unlock;
- }
-
- f = NULL;
- if (ia->ia_valid & ATTR_FILE)
- f = ia->ia_file;
- mutex_unlock(&a->h_inode->i_mutex);
- err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f);
- mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
- } else
- err = vfsub_notify_change(&a->h_path, ia);
- if (!err)
- au_cpup_attr_changeable(inode);
-
- out_unlock:
- mutex_unlock(&a->h_inode->i_mutex);
- au_unpin(&a->pin);
- out_dentry:
- di_write_unlock(dentry);
- if (file) {
- fi_write_unlock(file);
- ia->ia_file = file;
- ia->ia_valid |= ATTR_FILE;
- }
- out_si:
- si_read_unlock(sb);
- kfree(a);
- out:
- AuTraceErr(err);
- return err;
-}
-
-static void au_refresh_iattr(struct inode *inode, struct kstat *st,
- unsigned int nlink)
-{
- inode->i_mode = st->mode;
- inode->i_uid = st->uid;
- inode->i_gid = st->gid;
- inode->i_atime = st->atime;
- inode->i_mtime = st->mtime;
- inode->i_ctime = st->ctime;
-
- au_cpup_attr_nlink(inode, /*force*/0);
- if (S_ISDIR(inode->i_mode)) {
- inode->i_nlink -= nlink;
- inode->i_nlink += st->nlink;
- }
-
- spin_lock(&inode->i_lock);
- inode->i_blocks = st->blocks;
- i_size_write(inode, st->size);
- spin_unlock(&inode->i_lock);
-}
-
-static int aufs_getattr(struct vfsmount *mnt __maybe_unused,
- struct dentry *dentry, struct kstat *st)
-{
- int err;
- unsigned int mnt_flags;
- aufs_bindex_t bindex;
- unsigned char udba_none, positive;
- struct super_block *sb, *h_sb;
- struct inode *inode;
- struct vfsmount *h_mnt;
- struct dentry *h_dentry;
-
- err = 0;
- sb = dentry->d_sb;
- inode = dentry->d_inode;
- si_read_lock(sb, AuLock_FLUSH);
- mnt_flags = au_mntflags(sb);
- udba_none = !!au_opt_test(mnt_flags, UDBA_NONE);
-
- /* support fstat(2) */
- if (!d_unhashed(dentry) && !udba_none) {
- unsigned int sigen = au_sigen(sb);
- if (au_digen(dentry) == sigen && au_iigen(inode) == sigen)
- di_read_lock_child(dentry, AuLock_IR);
- else {
- AuDebugOn(IS_ROOT(dentry));
- di_write_lock_child(dentry);
- err = au_reval_for_attr(dentry, sigen);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out;
- }
- } else
- di_read_lock_child(dentry, AuLock_IR);
-
- bindex = au_ibstart(inode);
- h_mnt = au_sbr_mnt(sb, bindex);
- h_sb = h_mnt->mnt_sb;
- if (!au_test_fs_bad_iattr(h_sb) && udba_none)
- goto out_fill; /* success */
-
- h_dentry = NULL;
- if (au_dbstart(dentry) == bindex)
- h_dentry = dget(au_h_dptr(dentry, bindex));
- else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) {
- h_dentry = au_plink_lkup(inode, bindex);
- if (IS_ERR(h_dentry))
- goto out_fill; /* pretending success */
- }
- /* illegally overlapped or something */
- if (unlikely(!h_dentry))
- goto out_fill; /* pretending success */
-
- positive = !!h_dentry->d_inode;
- if (positive)
- err = vfs_getattr(h_mnt, h_dentry, st);
- dput(h_dentry);
- if (!err) {
- if (positive)
- au_refresh_iattr(inode, st, h_dentry->d_inode->i_nlink);
- goto out_fill; /* success */
- }
- goto out;
-
- out_fill:
- generic_fillattr(inode, st);
- out:
- di_read_unlock(dentry, AuLock_IR);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int h_readlink(struct dentry *dentry, int bindex, char __user *buf,
- int bufsiz)
-{
- int err;
- struct super_block *sb;
- struct dentry *h_dentry;
-
- err = -EINVAL;
- h_dentry = au_h_dptr(dentry, bindex);
- if (unlikely(!h_dentry->d_inode->i_op->readlink))
- goto out;
-
- err = security_inode_readlink(h_dentry);
- if (unlikely(err))
- goto out;
-
- sb = dentry->d_sb;
- if (!au_test_ro(sb, bindex, dentry->d_inode)) {
- vfsub_touch_atime(au_sbr_mnt(sb, bindex), h_dentry);
- fsstack_copy_attr_atime(dentry->d_inode, h_dentry->d_inode);
- }
- err = h_dentry->d_inode->i_op->readlink(h_dentry, buf, bufsiz);
-
- out:
- return err;
-}
-
-static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
-{
- int err;
-
- aufs_read_lock(dentry, AuLock_IR);
- err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz);
- aufs_read_unlock(dentry, AuLock_IR);
-
- return err;
-}
-
-static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
- int err;
- char *buf;
- mm_segment_t old_fs;
-
- err = -ENOMEM;
- buf = __getname_gfp(GFP_NOFS);
- if (unlikely(!buf))
- goto out;
-
- aufs_read_lock(dentry, AuLock_IR);
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- err = h_readlink(dentry, au_dbstart(dentry), (char __user *)buf,
- PATH_MAX);
- set_fs(old_fs);
- aufs_read_unlock(dentry, AuLock_IR);
-
- if (err >= 0) {
- buf[err] = 0;
- /* will be freed by put_link */
- nd_set_link(nd, buf);
- return NULL; /* success */
- }
- __putname(buf);
-
- out:
- path_put(&nd->path);
- AuTraceErr(err);
- return ERR_PTR(err);
-}
-
-static void aufs_put_link(struct dentry *dentry __maybe_unused,
- struct nameidata *nd, void *cookie __maybe_unused)
-{
- __putname(nd_get_link(nd));
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void aufs_truncate_range(struct inode *inode __maybe_unused,
- loff_t start __maybe_unused,
- loff_t end __maybe_unused)
-{
- AuUnsupport();
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct inode_operations aufs_symlink_iop = {
- .permission = aufs_permission,
- .setattr = aufs_setattr,
- .getattr = aufs_getattr,
- .readlink = aufs_readlink,
- .follow_link = aufs_follow_link,
- .put_link = aufs_put_link
-};
-
-struct inode_operations aufs_dir_iop = {
- .create = aufs_create,
- .lookup = aufs_lookup,
- .link = aufs_link,
- .unlink = aufs_unlink,
- .symlink = aufs_symlink,
- .mkdir = aufs_mkdir,
- .rmdir = aufs_rmdir,
- .mknod = aufs_mknod,
- .rename = aufs_rename,
-
- .permission = aufs_permission,
- .setattr = aufs_setattr,
- .getattr = aufs_getattr
-};
-
-struct inode_operations aufs_iop = {
- .permission = aufs_permission,
- .setattr = aufs_setattr,
- .getattr = aufs_getattr,
- .truncate_range = aufs_truncate_range
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode operations (add entry)
- */
-
-#include "aufs.h"
-
-/*
- * final procedure of adding a new entry, except link(2).
- * remove whiteout, instantiate, copyup the parent dir's times and size
- * and update version.
- * if it failed, re-create the removed whiteout.
- */
-static int epilog(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct dentry *dentry)
-{
- int err, rerr;
- aufs_bindex_t bwh;
- struct path h_path;
- struct inode *inode, *h_dir;
- struct dentry *wh;
-
- bwh = -1;
- if (wh_dentry) {
- h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
- IMustLock(h_dir);
- AuDebugOn(au_h_iptr(dir, bindex) != h_dir);
- bwh = au_dbwh(dentry);
- h_path.dentry = wh_dentry;
- h_path.mnt = au_sbr_mnt(dir->i_sb, bindex);
- err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path,
- dentry);
- if (unlikely(err))
- goto out;
- }
-
- inode = au_new_inode(dentry, /*must_new*/1);
- if (!IS_ERR(inode)) {
- d_instantiate(dentry, inode);
- dir = dentry->d_parent->d_inode; /* dir inode is locked */
- IMustLock(dir);
- if (au_ibstart(dir) == au_dbstart(dentry))
- au_cpup_attr_timesizes(dir);
- dir->i_version++;
- return 0; /* success */
- }
-
- err = PTR_ERR(inode);
- if (!wh_dentry)
- goto out;
-
- /* revert */
- /* dir inode is locked */
- wh = au_wh_create(dentry, bwh, wh_dentry->d_parent);
- rerr = PTR_ERR(wh);
- if (IS_ERR(wh)) {
- AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
- AuDLNPair(dentry), err, rerr);
- err = -EIO;
- } else
- dput(wh);
-
- out:
- return err;
-}
-
-/*
- * simple tests for the adding inode operations.
- * following the checks in vfs, plus the parent-child relationship.
- */
-int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir)
-{
- int err;
- umode_t h_mode;
- struct dentry *h_dentry;
- struct inode *h_inode;
-
- err = -ENAMETOOLONG;
- if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
- goto out;
-
- h_dentry = au_h_dptr(dentry, bindex);
- h_inode = h_dentry->d_inode;
- if (!dentry->d_inode) {
- err = -EEXIST;
- if (unlikely(h_inode))
- goto out;
- } else {
- /* rename(2) case */
- err = -EIO;
- if (unlikely(!h_inode || !h_inode->i_nlink))
- goto out;
-
- h_mode = h_inode->i_mode;
- if (!isdir) {
- err = -EISDIR;
- if (unlikely(S_ISDIR(h_mode)))
- goto out;
- } else if (unlikely(!S_ISDIR(h_mode))) {
- err = -ENOTDIR;
- goto out;
- }
- }
-
- err = 0;
- /* expected parent dir is locked */
- if (unlikely(h_parent != h_dentry->d_parent))
- err = -EIO;
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-/*
- * initial procedure of adding a new entry.
- * prepare writable branch and the parent dir, lock it,
- * and lookup whiteout for the new entry.
- */
-static struct dentry*
-lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
- struct dentry *src_dentry, struct au_pin *pin,
- struct au_wr_dir_args *wr_dir_args)
-{
- struct dentry *wh_dentry, *h_parent;
- struct super_block *sb;
- struct au_branch *br;
- int err;
- unsigned int udba;
- aufs_bindex_t bcpup;
-
- AuDbg("%.*s\n", AuDLNPair(dentry));
-
- err = au_wr_dir(dentry, src_dentry, wr_dir_args);
- bcpup = err;
- wh_dentry = ERR_PTR(err);
- if (unlikely(err < 0))
- goto out;
-
- sb = dentry->d_sb;
- udba = au_opt_udba(sb);
- err = au_pin(pin, dentry, bcpup, udba,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- h_parent = au_pinned_h_parent(pin);
- if (udba != AuOpt_UDBA_NONE
- && au_dbstart(dentry) == bcpup)
- err = au_may_add(dentry, bcpup, h_parent,
- au_ftest_wrdir(wr_dir_args->flags, ISDIR));
- else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
- err = -ENAMETOOLONG;
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_unpin;
-
- br = au_sbr(sb, bcpup);
- if (dt) {
- struct path tmp = {
- .dentry = h_parent,
- .mnt = br->br_mnt
- };
- au_dtime_store(dt, au_pinned_parent(pin), &tmp);
- }
-
- wh_dentry = NULL;
- if (bcpup != au_dbwh(dentry))
- goto out; /* success */
-
- wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
-
- out_unpin:
- if (IS_ERR(wh_dentry))
- au_unpin(pin);
- out:
- return wh_dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-enum { Mknod, Symlink, Creat };
-struct simple_arg {
- int type;
- union {
- struct {
- int mode;
- struct nameidata *nd;
- } c;
- struct {
- const char *symname;
- } s;
- struct {
- int mode;
- dev_t dev;
- } m;
- } u;
-};
-
-static int add_simple(struct inode *dir, struct dentry *dentry,
- struct simple_arg *arg)
-{
- int err;
- aufs_bindex_t bstart;
- unsigned char created;
- struct au_dtime dt;
- struct au_pin pin;
- struct path h_path;
- struct dentry *wh_dentry, *parent;
- struct inode *h_dir;
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = AuWrDir_ADD_ENTRY
- };
-
- AuDbg("%.*s\n", AuDLNPair(dentry));
- IMustLock(dir);
-
- parent = dentry->d_parent; /* dir inode is locked */
- aufs_read_lock(dentry, AuLock_DW);
- di_write_lock_parent(parent);
- wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin,
- &wr_dir_args);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out;
-
- bstart = au_dbstart(dentry);
- h_path.dentry = au_h_dptr(dentry, bstart);
- h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
- h_dir = au_pinned_h_dir(&pin);
- switch (arg->type) {
- case Creat:
- err = vfsub_create(h_dir, &h_path, arg->u.c.mode);
- break;
- case Symlink:
- err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname);
- break;
- case Mknod:
- err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev);
- break;
- default:
- BUG();
- }
- created = !err;
- if (!err)
- err = epilog(dir, bstart, wh_dentry, dentry);
-
- /* revert */
- if (unlikely(created && err && h_path.dentry->d_inode)) {
- int rerr;
- rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
- if (rerr) {
- AuIOErr("%.*s revert failure(%d, %d)\n",
- AuDLNPair(dentry), err, rerr);
- err = -EIO;
- }
- au_dtime_revert(&dt);
- d_drop(dentry);
- }
-
- au_unpin(&pin);
- dput(wh_dentry);
-
- out:
- if (unlikely(err)) {
- au_update_dbstart(dentry);
- d_drop(dentry);
- }
- di_write_unlock(parent);
- aufs_read_unlock(dentry, AuLock_DW);
- return err;
-}
-
-int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
-{
- struct simple_arg arg = {
- .type = Mknod,
- .u.m = {
- .mode = mode,
- .dev = dev
- }
- };
- return add_simple(dir, dentry, &arg);
-}
-
-int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
-{
- struct simple_arg arg = {
- .type = Symlink,
- .u.s.symname = symname
- };
- return add_simple(dir, dentry, &arg);
-}
-
-int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *nd)
-{
- struct simple_arg arg = {
- .type = Creat,
- .u.c = {
- .mode = mode,
- .nd = nd
- }
- };
- return add_simple(dir, dentry, &arg);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_link_args {
- aufs_bindex_t bdst, bsrc;
- struct au_pin pin;
- struct path h_path;
- struct dentry *src_parent, *parent;
-};
-
-static int au_cpup_before_link(struct dentry *src_dentry,
- struct au_link_args *a)
-{
- int err;
- struct dentry *h_src_dentry;
- struct mutex *h_mtx;
- struct file *h_file;
-
- di_read_lock_parent(a->src_parent, AuLock_IR);
- err = au_test_and_cpup_dirs(src_dentry, a->bdst);
- if (unlikely(err))
- goto out;
-
- h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
- h_mtx = &h_src_dentry->d_inode->i_mutex;
- err = au_pin(&a->pin, src_dentry, a->bdst,
- au_opt_udba(src_dentry->d_sb),
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out;
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- h_file = au_h_open_pre(src_dentry, a->bsrc);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- h_file = NULL;
- } else
- err = au_sio_cpup_simple(src_dentry, a->bdst, a->bsrc,
- AuCpup_DTIME /* | AuCpup_KEEPLINO */);
- mutex_unlock(h_mtx);
- au_h_open_post(src_dentry, a->bsrc, h_file);
- au_unpin(&a->pin);
-
- out:
- di_read_unlock(a->src_parent, AuLock_IR);
- return err;
-}
-
-static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a)
-{
- int err;
- unsigned char plink;
- struct inode *h_inode, *inode;
- struct dentry *h_src_dentry;
- struct super_block *sb;
- struct file *h_file;
-
- plink = 0;
- h_inode = NULL;
- sb = src_dentry->d_sb;
- inode = src_dentry->d_inode;
- if (au_ibstart(inode) <= a->bdst)
- h_inode = au_h_iptr(inode, a->bdst);
- if (!h_inode || !h_inode->i_nlink) {
- /* copyup src_dentry as the name of dentry. */
- au_set_dbstart(src_dentry, a->bdst);
- au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry));
- h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode;
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- h_file = au_h_open_pre(src_dentry, a->bsrc);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- h_file = NULL;
- } else
- err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc,
- -1, AuCpup_KEEPLINO,
- a->parent);
- mutex_unlock(&h_inode->i_mutex);
- au_h_open_post(src_dentry, a->bsrc, h_file);
- au_set_h_dptr(src_dentry, a->bdst, NULL);
- au_set_dbstart(src_dentry, a->bsrc);
- } else {
- /* the inode of src_dentry already exists on a.bdst branch */
- h_src_dentry = d_find_alias(h_inode);
- if (!h_src_dentry && au_plink_test(inode)) {
- plink = 1;
- h_src_dentry = au_plink_lkup(inode, a->bdst);
- err = PTR_ERR(h_src_dentry);
- if (IS_ERR(h_src_dentry))
- goto out;
-
- if (unlikely(!h_src_dentry->d_inode)) {
- dput(h_src_dentry);
- h_src_dentry = NULL;
- }
-
- }
- if (h_src_dentry) {
- err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
- &a->h_path);
- dput(h_src_dentry);
- } else {
- AuIOErr("no dentry found for hi%lu on b%d\n",
- h_inode->i_ino, a->bdst);
- err = -EIO;
- }
- }
-
- if (!err && !plink)
- au_plink_append(inode, a->bdst, a->h_path.dentry);
-
-out:
- return err;
-}
-
-int aufs_link(struct dentry *src_dentry, struct inode *dir,
- struct dentry *dentry)
-{
- int err, rerr;
- struct au_dtime dt;
- struct au_link_args *a;
- struct dentry *wh_dentry, *h_src_dentry;
- struct inode *inode;
- struct super_block *sb;
- struct au_wr_dir_args wr_dir_args = {
- /* .force_btgt = -1, */
- .flags = AuWrDir_ADD_ENTRY
- };
-
- IMustLock(dir);
- inode = src_dentry->d_inode;
- IMustLock(inode);
-
- err = -ENOENT;
- if (unlikely(!inode->i_nlink))
- goto out;
-
- err = -ENOMEM;
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- a->parent = dentry->d_parent; /* dir inode is locked */
- aufs_read_and_write_lock2(dentry, src_dentry, /*AuLock_FLUSH*/0);
- a->src_parent = dget_parent(src_dentry);
- wr_dir_args.force_btgt = au_dbstart(src_dentry);
-
- di_write_lock_parent(a->parent);
- wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
- wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin,
- &wr_dir_args);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_unlock;
-
- err = 0;
- sb = dentry->d_sb;
- a->bdst = au_dbstart(dentry);
- a->h_path.dentry = au_h_dptr(dentry, a->bdst);
- a->h_path.mnt = au_sbr_mnt(sb, a->bdst);
- a->bsrc = au_dbstart(src_dentry);
- if (au_opt_test(au_mntflags(sb), PLINK)) {
- if (a->bdst < a->bsrc
- /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */)
- err = au_cpup_or_link(src_dentry, a);
- else {
- h_src_dentry = au_h_dptr(src_dentry, a->bdst);
- err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
- &a->h_path);
- }
- } else {
- /*
- * copyup src_dentry to the branch we process,
- * and then link(2) to it.
- */
- if (a->bdst < a->bsrc
- /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) {
- au_unpin(&a->pin);
- di_write_unlock(a->parent);
- err = au_cpup_before_link(src_dentry, a);
- di_write_lock_parent(a->parent);
- if (!err)
- err = au_pin(&a->pin, dentry, a->bdst,
- au_opt_udba(sb),
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out_wh;
- }
- if (!err) {
- h_src_dentry = au_h_dptr(src_dentry, a->bdst);
- err = -ENOENT;
- if (h_src_dentry && h_src_dentry->d_inode)
- err = vfsub_link(h_src_dentry,
- au_pinned_h_dir(&a->pin),
- &a->h_path);
- }
- }
- if (unlikely(err))
- goto out_unpin;
-
- if (wh_dentry) {
- a->h_path.dentry = wh_dentry;
- err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path,
- dentry);
- if (unlikely(err))
- goto out_revert;
- }
-
- dir->i_version++;
- if (au_ibstart(dir) == au_dbstart(dentry))
- au_cpup_attr_timesizes(dir);
- inc_nlink(inode);
- inode->i_ctime = dir->i_ctime;
- if (!d_unhashed(a->h_path.dentry))
- d_instantiate(dentry, au_igrab(inode));
- else
- /* some filesystem calls d_drop() */
- d_drop(dentry);
- goto out_unpin; /* success */
-
- out_revert:
- rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, /*force*/0);
- if (!rerr)
- goto out_dt;
- AuIOErr("%.*s reverting failed(%d, %d)\n",
- AuDLNPair(dentry), err, rerr);
- err = -EIO;
- out_dt:
- d_drop(dentry);
- au_dtime_revert(&dt);
- out_unpin:
- au_unpin(&a->pin);
- out_wh:
- dput(wh_dentry);
- out_unlock:
- if (unlikely(err)) {
- au_update_dbstart(dentry);
- d_drop(dentry);
- }
- di_write_unlock(a->parent);
- dput(a->src_parent);
- aufs_read_and_write_unlock2(dentry, src_dentry);
- kfree(a);
- out:
- return err;
-}
-
-int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
- int err, rerr;
- aufs_bindex_t bindex;
- unsigned char diropq;
- struct path h_path;
- struct dentry *wh_dentry, *parent, *opq_dentry;
- struct mutex *h_mtx;
- struct super_block *sb;
- struct {
- struct au_pin pin;
- struct au_dtime dt;
- } *a; /* reduce the stack usage */
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
- };
-
- IMustLock(dir);
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- aufs_read_lock(dentry, AuLock_DW);
- parent = dentry->d_parent; /* dir inode is locked */
- di_write_lock_parent(parent);
- wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
- &a->pin, &wr_dir_args);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_free;
-
- sb = dentry->d_sb;
- bindex = au_dbstart(dentry);
- h_path.dentry = au_h_dptr(dentry, bindex);
- h_path.mnt = au_sbr_mnt(sb, bindex);
- err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode);
- if (unlikely(err))
- goto out_unlock;
-
- /* make the dir opaque */
- diropq = 0;
- h_mtx = &h_path.dentry->d_inode->i_mutex;
- if (wh_dentry
- || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) {
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- opq_dentry = au_diropq_create(dentry, bindex);
- mutex_unlock(h_mtx);
- err = PTR_ERR(opq_dentry);
- if (IS_ERR(opq_dentry))
- goto out_dir;
- dput(opq_dentry);
- diropq = 1;
- }
-
- err = epilog(dir, bindex, wh_dentry, dentry);
- if (!err) {
- inc_nlink(dir);
- goto out_unlock; /* success */
- }
-
- /* revert */
- if (diropq) {
- AuLabel(revert opq);
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- rerr = au_diropq_remove(dentry, bindex);
- mutex_unlock(h_mtx);
- if (rerr) {
- AuIOErr("%.*s reverting diropq failed(%d, %d)\n",
- AuDLNPair(dentry), err, rerr);
- err = -EIO;
- }
- }
-
- out_dir:
- AuLabel(revert dir);
- rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path);
- if (rerr) {
- AuIOErr("%.*s reverting dir failed(%d, %d)\n",
- AuDLNPair(dentry), err, rerr);
- err = -EIO;
- }
- d_drop(dentry);
- au_dtime_revert(&a->dt);
- out_unlock:
- au_unpin(&a->pin);
- dput(wh_dentry);
- out_free:
- if (unlikely(err)) {
- au_update_dbstart(dentry);
- d_drop(dentry);
- }
- di_write_unlock(parent);
- aufs_read_unlock(dentry, AuLock_DW);
- kfree(a);
- out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode operations (del entry)
- */
-
-#include "aufs.h"
-
-/*
- * decide if a new whiteout for @dentry is necessary or not.
- * when it is necessary, prepare the parent dir for the upper branch whose
- * branch index is @bcpup for creation. the actual creation of the whiteout will
- * be done by caller.
- * return value:
- * 0: wh is unnecessary
- * plus: wh is necessary
- * minus: error
- */
-int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup)
-{
- int need_wh, err;
- aufs_bindex_t bstart;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- bstart = au_dbstart(dentry);
- if (*bcpup < 0) {
- *bcpup = bstart;
- if (au_test_ro(sb, bstart, dentry->d_inode)) {
- err = AuWbrCopyup(au_sbi(sb), dentry);
- *bcpup = err;
- if (unlikely(err < 0))
- goto out;
- }
- } else
- AuDebugOn(bstart < *bcpup
- || au_test_ro(sb, *bcpup, dentry->d_inode));
- AuDbg("bcpup %d, bstart %d\n", *bcpup, bstart);
-
- if (*bcpup != bstart) {
- err = au_cpup_dirs(dentry, *bcpup);
- if (unlikely(err))
- goto out;
- need_wh = 1;
- } else {
- aufs_bindex_t old_bend, new_bend, bdiropq = -1;
-
- old_bend = au_dbend(dentry);
- if (isdir) {
- bdiropq = au_dbdiropq(dentry);
- au_set_dbdiropq(dentry, -1);
- }
- need_wh = au_lkup_dentry(dentry, bstart + 1, /*type*/0,
- /*nd*/NULL);
- err = need_wh;
- if (isdir)
- au_set_dbdiropq(dentry, bdiropq);
- if (unlikely(err < 0))
- goto out;
- new_bend = au_dbend(dentry);
- if (!need_wh && old_bend != new_bend) {
- au_set_h_dptr(dentry, new_bend, NULL);
- au_set_dbend(dentry, old_bend);
- }
- }
- AuDbg("need_wh %d\n", need_wh);
- err = need_wh;
-
- out:
- return err;
-}
-
-/*
- * simple tests for the del-entry operations.
- * following the checks in vfs, plus the parent-child relationship.
- */
-int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir)
-{
- int err;
- umode_t h_mode;
- struct dentry *h_dentry, *h_latest;
- struct inode *h_inode;
-
- h_dentry = au_h_dptr(dentry, bindex);
- h_inode = h_dentry->d_inode;
- if (dentry->d_inode) {
- err = -ENOENT;
- if (unlikely(!h_inode || !h_inode->i_nlink))
- goto out;
-
- h_mode = h_inode->i_mode;
- if (!isdir) {
- err = -EISDIR;
- if (unlikely(S_ISDIR(h_mode)))
- goto out;
- } else if (unlikely(!S_ISDIR(h_mode))) {
- err = -ENOTDIR;
- goto out;
- }
- } else {
- /* rename(2) case */
- err = -EIO;
- if (unlikely(h_inode))
- goto out;
- }
-
- err = -ENOENT;
- /* expected parent dir is locked */
- if (unlikely(h_parent != h_dentry->d_parent))
- goto out;
- err = 0;
-
- /*
- * rmdir a dir may break the consistency on some filesystem.
- * let's try heavy test.
- */
- err = -EACCES;
- if (unlikely(au_test_h_perm(h_parent->d_inode, MAY_EXEC | MAY_WRITE)))
- goto out;
-
- h_latest = au_sio_lkup_one(&dentry->d_name, h_parent,
- au_sbr(dentry->d_sb, bindex));
- err = -EIO;
- if (IS_ERR(h_latest))
- goto out;
- if (h_latest == h_dentry)
- err = 0;
- dput(h_latest);
-
- out:
- return err;
-}
-
-/*
- * decide the branch where we operate for @dentry. the branch index will be set
- * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent
- * dir for reverting.
- * when a new whiteout is necessary, create it.
- */
-static struct dentry*
-lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup,
- struct au_dtime *dt, struct au_pin *pin)
-{
- struct dentry *wh_dentry;
- struct super_block *sb;
- struct path h_path;
- int err, need_wh;
- unsigned int udba;
- aufs_bindex_t bcpup;
-
- need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup);
- wh_dentry = ERR_PTR(need_wh);
- if (unlikely(need_wh < 0))
- goto out;
-
- sb = dentry->d_sb;
- udba = au_opt_udba(sb);
- bcpup = *rbcpup;
- err = au_pin(pin, dentry, bcpup, udba,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- h_path.dentry = au_pinned_h_parent(pin);
- if (udba != AuOpt_UDBA_NONE
- && au_dbstart(dentry) == bcpup) {
- err = au_may_del(dentry, bcpup, h_path.dentry, isdir);
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_unpin;
- }
-
- h_path.mnt = au_sbr_mnt(sb, bcpup);
- au_dtime_store(dt, au_pinned_parent(pin), &h_path);
- wh_dentry = NULL;
- if (!need_wh)
- goto out; /* success, no need to create whiteout */
-
- wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry);
- if (IS_ERR(wh_dentry))
- goto out_unpin;
-
- /* returns with the parent is locked and wh_dentry is dget-ed */
- goto out; /* success */
-
- out_unpin:
- au_unpin(pin);
- out:
- return wh_dentry;
-}
-
-/*
- * when removing a dir, rename it to a unique temporary whiteout-ed name first
- * in order to be revertible and save time for removing many child whiteouts
- * under the dir.
- * returns 1 when there are too many child whiteout and caller should remove
- * them asynchronously. returns 0 when the number of children is enough small to
- * remove now or the branch fs is a remote fs.
- * otherwise return an error.
- */
-static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
- struct au_nhash *whlist, struct inode *dir)
-{
- int rmdir_later, err, dirwh;
- struct dentry *h_dentry;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- SiMustAnyLock(sb);
- h_dentry = au_h_dptr(dentry, bindex);
- err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex));
- if (unlikely(err))
- goto out;
-
- /* stop monitoring */
- au_hn_free(au_hi(dentry->d_inode, bindex));
-
- if (!au_test_fs_remote(h_dentry->d_sb)) {
- dirwh = au_sbi(sb)->si_dirwh;
- rmdir_later = (dirwh <= 1);
- if (!rmdir_later)
- rmdir_later = au_nhash_test_longer_wh(whlist, bindex,
- dirwh);
- if (rmdir_later)
- return rmdir_later;
- }
-
- err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist);
- if (unlikely(err)) {
- AuIOErr("rmdir %.*s, b%d failed, %d. ignored\n",
- AuDLNPair(h_dentry), bindex, err);
- err = 0;
- }
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-/*
- * final procedure for deleting a entry.
- * maintain dentry and iattr.
- */
-static void epilog(struct inode *dir, struct dentry *dentry,
- aufs_bindex_t bindex)
-{
- struct inode *inode;
-
- inode = dentry->d_inode;
- d_drop(dentry);
- inode->i_ctime = dir->i_ctime;
-
- if (atomic_read(&dentry->d_count) == 1) {
- au_set_h_dptr(dentry, au_dbstart(dentry), NULL);
- au_update_dbstart(dentry);
- }
- if (au_ibstart(dir) == bindex)
- au_cpup_attr_timesizes(dir);
- dir->i_version++;
-}
-
-/*
- * when an error happened, remove the created whiteout and revert everything.
- */
-static int do_revert(int err, struct inode *dir, aufs_bindex_t bwh,
- struct dentry *wh_dentry, struct dentry *dentry,
- struct au_dtime *dt)
-{
- int rerr;
- struct path h_path = {
- .dentry = wh_dentry,
- .mnt = au_sbr_mnt(dir->i_sb, bwh)
- };
-
- rerr = au_wh_unlink_dentry(au_h_iptr(dir, bwh), &h_path, dentry);
- if (!rerr) {
- au_set_dbwh(dentry, bwh);
- au_dtime_revert(dt);
- return 0;
- }
-
- AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
- AuDLNPair(dentry), err, rerr);
- return -EIO;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int aufs_unlink(struct inode *dir, struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bwh, bindex, bstart;
- struct au_dtime dt;
- struct au_pin pin;
- struct path h_path;
- struct inode *inode, *h_dir;
- struct dentry *parent, *wh_dentry;
-
- IMustLock(dir);
- inode = dentry->d_inode;
- if (unlikely(!inode))
- return -ENOENT; /* possible? */
- IMustLock(inode);
-
- aufs_read_lock(dentry, AuLock_DW);
- parent = dentry->d_parent; /* dir inode is locked */
- di_write_lock_parent(parent);
-
- bstart = au_dbstart(dentry);
- bwh = au_dbwh(dentry);
- bindex = -1;
- wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out;
-
- h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
- h_path.dentry = au_h_dptr(dentry, bstart);
- dget(h_path.dentry);
- if (bindex == bstart) {
- h_dir = au_pinned_h_dir(&pin);
- err = vfsub_unlink(h_dir, &h_path, /*force*/0);
- } else {
- /* dir inode is locked */
- h_dir = wh_dentry->d_parent->d_inode;
- IMustLock(h_dir);
- err = 0;
- }
-
- if (!err) {
- drop_nlink(inode);
- epilog(dir, dentry, bindex);
-
- /* update target timestamps */
- if (bindex == bstart) {
- vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
- inode->i_ctime = h_path.dentry->d_inode->i_ctime;
- } else
- /* todo: this timestamp may be reverted later */
- inode->i_ctime = h_dir->i_ctime;
- goto out_unlock; /* success */
- }
-
- /* revert */
- if (wh_dentry) {
- int rerr;
-
- rerr = do_revert(err, dir, bwh, wh_dentry, dentry, &dt);
- if (rerr)
- err = rerr;
- }
-
- out_unlock:
- au_unpin(&pin);
- dput(wh_dentry);
- dput(h_path.dentry);
- out:
- di_write_unlock(parent);
- aufs_read_unlock(dentry, AuLock_DW);
- return err;
-}
-
-int aufs_rmdir(struct inode *dir, struct dentry *dentry)
-{
- int err, rmdir_later;
- aufs_bindex_t bwh, bindex, bstart;
- struct au_dtime dt;
- struct au_pin pin;
- struct inode *inode;
- struct dentry *parent, *wh_dentry, *h_dentry;
- struct au_whtmp_rmdir *args;
-
- IMustLock(dir);
- inode = dentry->d_inode;
- err = -ENOENT; /* possible? */
- if (unlikely(!inode))
- goto out;
- IMustLock(inode);
-
- aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH);
- err = -ENOMEM;
- args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
- if (unlikely(!args))
- goto out_unlock;
-
- parent = dentry->d_parent; /* dir inode is locked */
- di_write_lock_parent(parent);
- err = au_test_empty(dentry, &args->whlist);
- if (unlikely(err))
- goto out_args;
-
- bstart = au_dbstart(dentry);
- bwh = au_dbwh(dentry);
- bindex = -1;
- wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_args;
-
- h_dentry = au_h_dptr(dentry, bstart);
- dget(h_dentry);
- rmdir_later = 0;
- if (bindex == bstart) {
- err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
- if (err > 0) {
- rmdir_later = err;
- err = 0;
- }
- } else {
- /* stop monitoring */
- au_hn_free(au_hi(inode, bstart));
-
- /* dir inode is locked */
- IMustLock(wh_dentry->d_parent->d_inode);
- err = 0;
- }
-
- if (!err) {
- clear_nlink(inode);
- au_set_dbdiropq(dentry, -1);
- epilog(dir, dentry, bindex);
-
- if (rmdir_later) {
- au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
- args = NULL;
- }
-
- goto out_unpin; /* success */
- }
-
- /* revert */
- AuLabel(revert);
- if (wh_dentry) {
- int rerr;
-
- rerr = do_revert(err, dir, bwh, wh_dentry, dentry, &dt);
- if (rerr)
- err = rerr;
- }
-
- out_unpin:
- au_unpin(&pin);
- dput(wh_dentry);
- dput(h_dentry);
- out_args:
- di_write_unlock(parent);
- if (args)
- au_whtmp_rmdir_free(args);
- out_unlock:
- aufs_read_unlock(dentry, AuLock_DW);
- out:
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode operation (rename entry)
- * todo: this is crazy monster
- */
-
-#include "aufs.h"
-
-enum { AuSRC, AuDST, AuSrcDst };
-enum { AuPARENT, AuCHILD, AuParentChild };
-
-#define AuRen_ISDIR 1
-#define AuRen_ISSAMEDIR (1 << 1)
-#define AuRen_WHSRC (1 << 2)
-#define AuRen_WHDST (1 << 3)
-#define AuRen_MNT_WRITE (1 << 4)
-#define AuRen_DT_DSTDIR (1 << 5)
-#define AuRen_DIROPQ (1 << 6)
-#define AuRen_CPUP (1 << 7)
-#define au_ftest_ren(flags, name) ((flags) & AuRen_##name)
-#define au_fset_ren(flags, name) { (flags) |= AuRen_##name; }
-#define au_fclr_ren(flags, name) { (flags) &= ~AuRen_##name; }
-
-struct au_ren_args {
- struct {
- struct dentry *dentry, *h_dentry, *parent, *h_parent,
- *wh_dentry;
- struct inode *dir, *inode;
- struct au_hinode *hdir;
- struct au_dtime dt[AuParentChild];
- aufs_bindex_t bstart;
- } sd[AuSrcDst];
-
-#define src_dentry sd[AuSRC].dentry
-#define src_dir sd[AuSRC].dir
-#define src_inode sd[AuSRC].inode
-#define src_h_dentry sd[AuSRC].h_dentry
-#define src_parent sd[AuSRC].parent
-#define src_h_parent sd[AuSRC].h_parent
-#define src_wh_dentry sd[AuSRC].wh_dentry
-#define src_hdir sd[AuSRC].hdir
-#define src_h_dir sd[AuSRC].hdir->hi_inode
-#define src_dt sd[AuSRC].dt
-#define src_bstart sd[AuSRC].bstart
-
-#define dst_dentry sd[AuDST].dentry
-#define dst_dir sd[AuDST].dir
-#define dst_inode sd[AuDST].inode
-#define dst_h_dentry sd[AuDST].h_dentry
-#define dst_parent sd[AuDST].parent
-#define dst_h_parent sd[AuDST].h_parent
-#define dst_wh_dentry sd[AuDST].wh_dentry
-#define dst_hdir sd[AuDST].hdir
-#define dst_h_dir sd[AuDST].hdir->hi_inode
-#define dst_dt sd[AuDST].dt
-#define dst_bstart sd[AuDST].bstart
-
- struct dentry *h_trap;
- struct au_branch *br;
- struct au_hinode *src_hinode;
- struct path h_path;
- struct au_nhash whlist;
- aufs_bindex_t btgt;
-
- unsigned int flags;
-
- struct au_whtmp_rmdir *thargs;
- struct dentry *h_dst;
-};
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * functions for reverting.
- * when an error happened in a single rename systemcall, we should revert
- * everything as if nothing happend.
- * we don't need to revert the copied-up/down the parent dir since they are
- * harmless.
- */
-
-#define RevertFailure(fmt, ...) do { \
- AuIOErr("revert failure: " fmt " (%d, %d)\n", \
- ##__VA_ARGS__, err, rerr); \
- err = -EIO; \
-} while (0)
-
-static void au_ren_rev_diropq(int err, struct au_ren_args *a)
-{
- int rerr;
-
- au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
- rerr = au_diropq_remove(a->src_dentry, a->btgt);
- au_hn_imtx_unlock(a->src_hinode);
- if (rerr)
- RevertFailure("remove diropq %.*s", AuDLNPair(a->src_dentry));
-}
-
-static void au_ren_rev_rename(int err, struct au_ren_args *a)
-{
- int rerr;
-
- a->h_path.dentry = au_lkup_one(&a->src_dentry->d_name, a->src_h_parent,
- a->br, /*nd*/NULL);
- rerr = PTR_ERR(a->h_path.dentry);
- if (IS_ERR(a->h_path.dentry)) {
- RevertFailure("au_lkup_one %.*s", AuDLNPair(a->src_dentry));
- return;
- }
-
- rerr = vfsub_rename(a->dst_h_dir,
- au_h_dptr(a->src_dentry, a->btgt),
- a->src_h_dir, &a->h_path);
- d_drop(a->h_path.dentry);
- dput(a->h_path.dentry);
- /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */
- if (rerr)
- RevertFailure("rename %.*s", AuDLNPair(a->src_dentry));
-}
-
-static void au_ren_rev_cpup(int err, struct au_ren_args *a)
-{
- int rerr;
-
- a->h_path.dentry = a->dst_h_dentry;
- rerr = vfsub_unlink(a->dst_h_dir, &a->h_path, /*force*/0);
- au_set_h_dptr(a->src_dentry, a->btgt, NULL);
- au_set_dbstart(a->src_dentry, a->src_bstart);
- if (rerr)
- RevertFailure("unlink %.*s", AuDLNPair(a->dst_h_dentry));
-}
-
-static void au_ren_rev_whtmp(int err, struct au_ren_args *a)
-{
- int rerr;
-
- a->h_path.dentry = au_lkup_one(&a->dst_dentry->d_name, a->dst_h_parent,
- a->br, /*nd*/NULL);
- rerr = PTR_ERR(a->h_path.dentry);
- if (IS_ERR(a->h_path.dentry)) {
- RevertFailure("lookup %.*s", AuDLNPair(a->dst_dentry));
- return;
- }
- if (a->h_path.dentry->d_inode) {
- d_drop(a->h_path.dentry);
- dput(a->h_path.dentry);
- return;
- }
-
- rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path);
- d_drop(a->h_path.dentry);
- dput(a->h_path.dentry);
- if (!rerr)
- au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst));
- else
- RevertFailure("rename %.*s", AuDLNPair(a->h_dst));
-}
-
-static void au_ren_rev_whsrc(int err, struct au_ren_args *a)
-{
- int rerr;
-
- a->h_path.dentry = a->src_wh_dentry;
- rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry);
- if (rerr)
- RevertFailure("unlink %.*s", AuDLNPair(a->src_wh_dentry));
-}
-
-static void au_ren_rev_drop(struct au_ren_args *a)
-{
- struct dentry *d, *h_d;
- int i;
- aufs_bindex_t bend, bindex;
-
- for (i = 0; i < AuSrcDst; i++) {
- d = a->sd[i].dentry;
- d_drop(d);
- bend = au_dbend(d);
- for (bindex = au_dbstart(d); bindex <= bend; bindex++) {
- h_d = au_h_dptr(d, bindex);
- if (h_d)
- d_drop(h_d);
- }
- }
-
- au_update_dbstart(a->dst_dentry);
- if (a->thargs)
- d_drop(a->h_dst);
-}
-#undef RevertFailure
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * when we have to copyup the renaming entry, do it with the rename-target name
- * in order to minimize the cost (the later actual rename is unnecessary).
- * otherwise rename it on the target branch.
- */
-static int au_ren_or_cpup(struct au_ren_args *a)
-{
- int err;
- struct dentry *d;
-
- d = a->src_dentry;
- if (au_dbstart(d) == a->btgt) {
- a->h_path.dentry = a->dst_h_dentry;
- if (au_ftest_ren(a->flags, DIROPQ)
- && au_dbdiropq(d) == a->btgt)
- au_fclr_ren(a->flags, DIROPQ);
- AuDebugOn(au_dbstart(d) != a->btgt);
- err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt),
- a->dst_h_dir, &a->h_path);
- } else {
- struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
- struct file *h_file;
-
- au_fset_ren(a->flags, CPUP);
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- au_set_dbstart(d, a->btgt);
- au_set_h_dptr(d, a->btgt, dget(a->dst_h_dentry));
- h_file = au_h_open_pre(d, a->src_bstart);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- h_file = NULL;
- } else
- err = au_sio_cpup_single(d, a->btgt, a->src_bstart, -1,
- !AuCpup_DTIME, a->dst_parent);
- mutex_unlock(h_mtx);
- au_h_open_post(d, a->src_bstart, h_file);
- if (!err) {
- d = a->dst_dentry;
- au_set_h_dptr(d, a->btgt, NULL);
- au_update_dbstart(d);
- } else {
- au_set_h_dptr(d, a->btgt, NULL);
- au_set_dbstart(d, a->src_bstart);
- }
- }
-
- return err;
-}
-
-/* cf. aufs_rmdir() */
-static int au_ren_del_whtmp(struct au_ren_args *a)
-{
- int err;
- struct inode *dir;
-
- dir = a->dst_dir;
- SiMustAnyLock(dir->i_sb);
- if (!au_nhash_test_longer_wh(&a->whlist, a->btgt,
- au_sbi(dir->i_sb)->si_dirwh)
- || au_test_fs_remote(a->h_dst->d_sb)) {
- err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist);
- if (unlikely(err))
- pr_warning("failed removing whtmp dir %.*s (%d), "
- "ignored.\n", AuDLNPair(a->h_dst), err);
- } else {
- au_nhash_wh_free(&a->thargs->whlist);
- a->thargs->whlist = a->whlist;
- a->whlist.nh_num = 0;
- au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs);
- dput(a->h_dst);
- a->thargs = NULL;
- }
-
- return 0;
-}
-
-/* make it 'opaque' dir. */
-static int au_ren_diropq(struct au_ren_args *a)
-{
- int err;
- struct dentry *diropq;
-
- err = 0;
- a->src_hinode = au_hi(a->src_inode, a->btgt);
- au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
- diropq = au_diropq_create(a->src_dentry, a->btgt);
- au_hn_imtx_unlock(a->src_hinode);
- if (IS_ERR(diropq))
- err = PTR_ERR(diropq);
- dput(diropq);
-
- return err;
-}
-
-static int do_rename(struct au_ren_args *a)
-{
- int err;
- struct dentry *d, *h_d;
-
- /* prepare workqueue args for asynchronous rmdir */
- h_d = a->dst_h_dentry;
- if (au_ftest_ren(a->flags, ISDIR) && h_d->d_inode) {
- err = -ENOMEM;
- a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS);
- if (unlikely(!a->thargs))
- goto out;
- a->h_dst = dget(h_d);
- }
-
- /* create whiteout for src_dentry */
- if (au_ftest_ren(a->flags, WHSRC)) {
- a->src_wh_dentry
- = au_wh_create(a->src_dentry, a->btgt, a->src_h_parent);
- err = PTR_ERR(a->src_wh_dentry);
- if (IS_ERR(a->src_wh_dentry))
- goto out_thargs;
- }
-
- /* lookup whiteout for dentry */
- if (au_ftest_ren(a->flags, WHDST)) {
- h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name,
- a->br);
- err = PTR_ERR(h_d);
- if (IS_ERR(h_d))
- goto out_whsrc;
- if (!h_d->d_inode)
- dput(h_d);
- else
- a->dst_wh_dentry = h_d;
- }
-
- /* rename dentry to tmpwh */
- if (a->thargs) {
- err = au_whtmp_ren(a->dst_h_dentry, a->br);
- if (unlikely(err))
- goto out_whdst;
-
- d = a->dst_dentry;
- au_set_h_dptr(d, a->btgt, NULL);
- err = au_lkup_neg(d, a->btgt);
- if (unlikely(err))
- goto out_whtmp;
- a->dst_h_dentry = au_h_dptr(d, a->btgt);
- }
-
- /* cpup src */
- if (a->dst_h_dentry->d_inode && a->src_bstart != a->btgt) {
- struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
- struct file *h_file;
-
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- AuDebugOn(au_dbstart(a->src_dentry) != a->src_bstart);
- h_file = au_h_open_pre(a->src_dentry, a->src_bstart);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- h_file = NULL;
- } else
- err = au_sio_cpup_simple(a->src_dentry, a->btgt, -1,
- !AuCpup_DTIME);
- mutex_unlock(h_mtx);
- au_h_open_post(a->src_dentry, a->src_bstart, h_file);
- if (unlikely(err))
- goto out_whtmp;
- }
-
- /* rename by vfs_rename or cpup */
- d = a->dst_dentry;
- if (au_ftest_ren(a->flags, ISDIR)
- && (a->dst_wh_dentry
- || au_dbdiropq(d) == a->btgt
- /* hide the lower to keep xino */
- || a->btgt < au_dbend(d)
- || au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ)))
- au_fset_ren(a->flags, DIROPQ);
- err = au_ren_or_cpup(a);
- if (unlikely(err))
- /* leave the copied-up one */
- goto out_whtmp;
-
- /* make dir opaque */
- if (au_ftest_ren(a->flags, DIROPQ)) {
- err = au_ren_diropq(a);
- if (unlikely(err))
- goto out_rename;
- }
-
- /* update target timestamps */
- AuDebugOn(au_dbstart(a->src_dentry) != a->btgt);
- a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt);
- vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/
- a->src_inode->i_ctime = a->h_path.dentry->d_inode->i_ctime;
-
- /* remove whiteout for dentry */
- if (a->dst_wh_dentry) {
- a->h_path.dentry = a->dst_wh_dentry;
- err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path,
- a->dst_dentry);
- if (unlikely(err))
- goto out_diropq;
- }
-
- /* remove whtmp */
- if (a->thargs)
- au_ren_del_whtmp(a); /* ignore this error */
-
- err = 0;
- goto out_success;
-
- out_diropq:
- if (au_ftest_ren(a->flags, DIROPQ))
- au_ren_rev_diropq(err, a);
- out_rename:
- if (!au_ftest_ren(a->flags, CPUP))
- au_ren_rev_rename(err, a);
- else
- au_ren_rev_cpup(err, a);
- out_whtmp:
- if (a->thargs)
- au_ren_rev_whtmp(err, a);
- out_whdst:
- dput(a->dst_wh_dentry);
- a->dst_wh_dentry = NULL;
- out_whsrc:
- if (a->src_wh_dentry)
- au_ren_rev_whsrc(err, a);
- au_ren_rev_drop(a);
- out_success:
- dput(a->src_wh_dentry);
- dput(a->dst_wh_dentry);
- out_thargs:
- if (a->thargs) {
- dput(a->h_dst);
- au_whtmp_rmdir_free(a->thargs);
- a->thargs = NULL;
- }
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * test if @dentry dir can be rename destination or not.
- * success means, it is a logically empty dir.
- */
-static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist)
-{
- return au_test_empty(dentry, whlist);
-}
-
-/*
- * test if @dentry dir can be rename source or not.
- * if it can, return 0 and @children is filled.
- * success means,
- * - it is a logically empty dir.
- * - or, it exists on writable branch and has no children including whiteouts
- * on the lower branch.
- */
-static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt)
-{
- int err;
- unsigned int rdhash;
- aufs_bindex_t bstart;
-
- bstart = au_dbstart(dentry);
- if (bstart != btgt) {
- struct au_nhash whlist;
-
- SiMustAnyLock(dentry->d_sb);
- rdhash = au_sbi(dentry->d_sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(/*file*/NULL,
- dentry));
- err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_test_empty(dentry, &whlist);
- au_nhash_wh_free(&whlist);
- goto out;
- }
-
- if (bstart == au_dbtaildir(dentry))
- return 0; /* success */
-
- err = au_test_empty_lower(dentry);
-
- out:
- if (err == -ENOTEMPTY) {
- AuWarn1("renaming dir who has child(ren) on multiple branches,"
- " is not supported\n");
- err = -EXDEV;
- }
- return err;
-}
-
-/* side effect: sets whlist and h_dentry */
-static int au_ren_may_dir(struct au_ren_args *a)
-{
- int err;
- unsigned int rdhash;
- struct dentry *d;
-
- d = a->dst_dentry;
- SiMustAnyLock(d->d_sb);
-
- err = 0;
- if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) {
- rdhash = au_sbi(d->d_sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d));
- err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
-
- au_set_dbstart(d, a->dst_bstart);
- err = may_rename_dstdir(d, &a->whlist);
- au_set_dbstart(d, a->btgt);
- }
- a->dst_h_dentry = au_h_dptr(d, au_dbstart(d));
- if (unlikely(err))
- goto out;
-
- d = a->src_dentry;
- a->src_h_dentry = au_h_dptr(d, au_dbstart(d));
- if (au_ftest_ren(a->flags, ISDIR)) {
- err = may_rename_srcdir(d, a->btgt);
- if (unlikely(err)) {
- au_nhash_wh_free(&a->whlist);
- a->whlist.nh_num = 0;
- }
- }
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * simple tests for rename.
- * following the checks in vfs, plus the parent-child relationship.
- */
-static int au_may_ren(struct au_ren_args *a)
-{
- int err, isdir;
- struct inode *h_inode;
-
- if (a->src_bstart == a->btgt) {
- err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent,
- au_ftest_ren(a->flags, ISDIR));
- if (unlikely(err))
- goto out;
- err = -EINVAL;
- if (unlikely(a->src_h_dentry == a->h_trap))
- goto out;
- }
-
- err = 0;
- if (a->dst_bstart != a->btgt)
- goto out;
-
- err = -EIO;
- h_inode = a->dst_h_dentry->d_inode;
- isdir = !!au_ftest_ren(a->flags, ISDIR);
- if (!a->dst_dentry->d_inode) {
- if (unlikely(h_inode))
- goto out;
- err = au_may_add(a->dst_dentry, a->btgt, a->dst_h_parent,
- isdir);
- } else {
- if (unlikely(!h_inode || !h_inode->i_nlink))
- goto out;
- err = au_may_del(a->dst_dentry, a->btgt, a->dst_h_parent,
- isdir);
- if (unlikely(err))
- goto out;
- err = -ENOTEMPTY;
- if (unlikely(a->dst_h_dentry == a->h_trap))
- goto out;
- err = 0;
- }
-
- out:
- if (unlikely(err == -ENOENT || err == -EEXIST))
- err = -EIO;
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * locking order
- * (VFS)
- * - src_dir and dir by lock_rename()
- * - inode if exitsts
- * (aufs)
- * - lock all
- * + src_dentry and dentry by aufs_read_and_write_lock2() which calls,
- * + si_read_lock
- * + di_write_lock2_child()
- * + di_write_lock_child()
- * + ii_write_lock_child()
- * + di_write_lock_child2()
- * + ii_write_lock_child2()
- * + src_parent and parent
- * + di_write_lock_parent()
- * + ii_write_lock_parent()
- * + di_write_lock_parent2()
- * + ii_write_lock_parent2()
- * + lower src_dir and dir by vfsub_lock_rename()
- * + verify the every relationships between child and parent. if any
- * of them failed, unlock all and return -EBUSY.
- */
-static void au_ren_unlock(struct au_ren_args *a)
-{
- struct super_block *sb;
-
- sb = a->dst_dentry->d_sb;
- if (au_ftest_ren(a->flags, MNT_WRITE))
- mnt_drop_write(a->br->br_mnt);
- vfsub_unlock_rename(a->src_h_parent, a->src_hdir,
- a->dst_h_parent, a->dst_hdir);
-}
-
-static int au_ren_lock(struct au_ren_args *a)
-{
- int err;
- unsigned int udba;
-
- err = 0;
- a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
- a->src_hdir = au_hi(a->src_dir, a->btgt);
- a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
- a->dst_hdir = au_hi(a->dst_dir, a->btgt);
- a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
- a->dst_h_parent, a->dst_hdir);
- udba = au_opt_udba(a->src_dentry->d_sb);
- if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode
- || a->dst_hdir->hi_inode != a->dst_h_parent->d_inode))
- err = au_busy_or_stale();
- if (!err && au_dbstart(a->src_dentry) == a->btgt)
- err = au_h_verify(a->src_h_dentry, udba,
- a->src_h_parent->d_inode, a->src_h_parent,
- a->br);
- if (!err && au_dbstart(a->dst_dentry) == a->btgt)
- err = au_h_verify(a->dst_h_dentry, udba,
- a->dst_h_parent->d_inode, a->dst_h_parent,
- a->br);
- if (!err) {
- err = mnt_want_write(a->br->br_mnt);
- if (unlikely(err))
- goto out_unlock;
- au_fset_ren(a->flags, MNT_WRITE);
- goto out; /* success */
- }
-
- err = au_busy_or_stale();
-
- out_unlock:
- au_ren_unlock(a);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_ren_refresh_dir(struct au_ren_args *a)
-{
- struct inode *dir;
-
- dir = a->dst_dir;
- dir->i_version++;
- if (au_ftest_ren(a->flags, ISDIR)) {
- /* is this updating defined in POSIX? */
- au_cpup_attr_timesizes(a->src_inode);
- au_cpup_attr_nlink(dir, /*force*/1);
- if (a->dst_inode) {
- clear_nlink(a->dst_inode);
- au_cpup_attr_timesizes(a->dst_inode);
- }
- }
- if (au_ibstart(dir) == a->btgt)
- au_cpup_attr_timesizes(dir);
-
- if (au_ftest_ren(a->flags, ISSAMEDIR))
- return;
-
- dir = a->src_dir;
- dir->i_version++;
- if (au_ftest_ren(a->flags, ISDIR))
- au_cpup_attr_nlink(dir, /*force*/1);
- if (au_ibstart(dir) == a->btgt)
- au_cpup_attr_timesizes(dir);
-}
-
-static void au_ren_refresh(struct au_ren_args *a)
-{
- aufs_bindex_t bend, bindex;
- struct dentry *d, *h_d;
- struct inode *i, *h_i;
- struct super_block *sb;
-
- d = a->src_dentry;
- au_set_dbwh(d, -1);
- bend = au_dbend(d);
- for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
- h_d = au_h_dptr(d, bindex);
- if (h_d)
- au_set_h_dptr(d, bindex, NULL);
- }
- au_set_dbend(d, a->btgt);
-
- sb = d->d_sb;
- i = a->src_inode;
- if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i))
- return; /* success */
-
- bend = au_ibend(i);
- for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
- h_i = au_h_iptr(i, bindex);
- if (h_i) {
- au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0);
- /* ignore this error */
- au_set_h_iptr(i, bindex, NULL, 0);
- }
- }
- au_set_ibend(i, a->btgt);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* mainly for link(2) and rename(2) */
-int au_wbr(struct dentry *dentry, aufs_bindex_t btgt)
-{
- aufs_bindex_t bdiropq, bwh;
- struct dentry *parent;
- struct au_branch *br;
-
- parent = dentry->d_parent;
- IMustLock(parent->d_inode); /* dir is locked */
-
- bdiropq = au_dbdiropq(parent);
- bwh = au_dbwh(dentry);
- br = au_sbr(dentry->d_sb, btgt);
- if (au_br_rdonly(br)
- || (0 <= bdiropq && bdiropq < btgt)
- || (0 <= bwh && bwh < btgt))
- btgt = -1;
-
- AuDbg("btgt %d\n", btgt);
- return btgt;
-}
-
-/* sets src_bstart, dst_bstart and btgt */
-static int au_ren_wbr(struct au_ren_args *a)
-{
- int err;
- struct au_wr_dir_args wr_dir_args = {
- /* .force_btgt = -1, */
- .flags = AuWrDir_ADD_ENTRY
- };
-
- a->src_bstart = au_dbstart(a->src_dentry);
- a->dst_bstart = au_dbstart(a->dst_dentry);
- if (au_ftest_ren(a->flags, ISDIR))
- au_fset_wrdir(wr_dir_args.flags, ISDIR);
- wr_dir_args.force_btgt = a->src_bstart;
- if (a->dst_inode && a->dst_bstart < a->src_bstart)
- wr_dir_args.force_btgt = a->dst_bstart;
- wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt);
- err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args);
- a->btgt = err;
-
- return err;
-}
-
-static void au_ren_dt(struct au_ren_args *a)
-{
- a->h_path.dentry = a->src_h_parent;
- au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path);
- if (!au_ftest_ren(a->flags, ISSAMEDIR)) {
- a->h_path.dentry = a->dst_h_parent;
- au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path);
- }
-
- au_fclr_ren(a->flags, DT_DSTDIR);
- if (!au_ftest_ren(a->flags, ISDIR))
- return;
-
- a->h_path.dentry = a->src_h_dentry;
- au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path);
- if (a->dst_h_dentry->d_inode) {
- au_fset_ren(a->flags, DT_DSTDIR);
- a->h_path.dentry = a->dst_h_dentry;
- au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path);
- }
-}
-
-static void au_ren_rev_dt(int err, struct au_ren_args *a)
-{
- struct dentry *h_d;
- struct mutex *h_mtx;
-
- au_dtime_revert(a->src_dt + AuPARENT);
- if (!au_ftest_ren(a->flags, ISSAMEDIR))
- au_dtime_revert(a->dst_dt + AuPARENT);
-
- if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) {
- h_d = a->src_dt[AuCHILD].dt_h_path.dentry;
- h_mtx = &h_d->d_inode->i_mutex;
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- au_dtime_revert(a->src_dt + AuCHILD);
- mutex_unlock(h_mtx);
-
- if (au_ftest_ren(a->flags, DT_DSTDIR)) {
- h_d = a->dst_dt[AuCHILD].dt_h_path.dentry;
- h_mtx = &h_d->d_inode->i_mutex;
- mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
- au_dtime_revert(a->dst_dt + AuCHILD);
- mutex_unlock(h_mtx);
- }
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry,
- struct inode *_dst_dir, struct dentry *_dst_dentry)
-{
- int err;
- /* reduce stack space */
- struct au_ren_args *a;
-
- AuDbg("%.*s, %.*s\n", AuDLNPair(_src_dentry), AuDLNPair(_dst_dentry));
- IMustLock(_src_dir);
- IMustLock(_dst_dir);
-
- err = -ENOMEM;
- BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE);
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- a->src_dir = _src_dir;
- a->src_dentry = _src_dentry;
- a->src_inode = a->src_dentry->d_inode;
- a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */
- a->dst_dir = _dst_dir;
- a->dst_dentry = _dst_dentry;
- a->dst_inode = a->dst_dentry->d_inode;
- a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */
- if (a->dst_inode) {
- IMustLock(a->dst_inode);
- au_igrab(a->dst_inode);
- }
-
- err = -ENOTDIR;
- if (S_ISDIR(a->src_inode->i_mode)) {
- au_fset_ren(a->flags, ISDIR);
- if (unlikely(a->dst_inode && !S_ISDIR(a->dst_inode->i_mode)))
- goto out_free;
- aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
- AuLock_DIR | AuLock_FLUSH);
- } else
- aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
- AuLock_FLUSH);
-
- au_fset_ren(a->flags, ISSAMEDIR); /* temporary */
- di_write_lock_parent(a->dst_parent);
-
- /* which branch we process */
- err = au_ren_wbr(a);
- if (unlikely(err < 0))
- goto out_unlock;
- a->br = au_sbr(a->dst_dentry->d_sb, a->btgt);
- a->h_path.mnt = a->br->br_mnt;
-
- /* are they available to be renamed */
- err = au_ren_may_dir(a);
- if (unlikely(err))
- goto out_children;
-
- /* prepare the writable parent dir on the same branch */
- if (a->dst_bstart == a->btgt) {
- au_fset_ren(a->flags, WHDST);
- } else {
- err = au_cpup_dirs(a->dst_dentry, a->btgt);
- if (unlikely(err))
- goto out_children;
- }
-
- if (a->src_dir != a->dst_dir) {
- /*
- * this temporary unlock is safe,
- * because both dir->i_mutex are locked.
- */
- di_write_unlock(a->dst_parent);
- di_write_lock_parent(a->src_parent);
- err = au_wr_dir_need_wh(a->src_dentry,
- au_ftest_ren(a->flags, ISDIR),
- &a->btgt);
- di_write_unlock(a->src_parent);
- di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1);
- au_fclr_ren(a->flags, ISSAMEDIR);
- } else
- err = au_wr_dir_need_wh(a->src_dentry,
- au_ftest_ren(a->flags, ISDIR),
- &a->btgt);
- if (unlikely(err < 0))
- goto out_children;
- if (err)
- au_fset_ren(a->flags, WHSRC);
-
- /* lock them all */
- err = au_ren_lock(a);
- if (unlikely(err))
- goto out_children;
-
- if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE))
- err = au_may_ren(a);
- else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN))
- err = -ENAMETOOLONG;
- if (unlikely(err))
- goto out_hdir;
-
- /* store timestamps to be revertible */
- au_ren_dt(a);
-
- /* here we go */
- err = do_rename(a);
- if (unlikely(err))
- goto out_dt;
-
- /* update dir attributes */
- au_ren_refresh_dir(a);
-
- /* dput/iput all lower dentries */
- au_ren_refresh(a);
-
- goto out_hdir; /* success */
-
- out_dt:
- au_ren_rev_dt(err, a);
- out_hdir:
- au_ren_unlock(a);
- out_children:
- au_nhash_wh_free(&a->whlist);
- out_unlock:
- if (unlikely(err && au_ftest_ren(a->flags, ISDIR))) {
- au_update_dbstart(a->dst_dentry);
- d_drop(a->dst_dentry);
- }
- if (!err)
- d_move(a->src_dentry, a->dst_dentry);
- if (au_ftest_ren(a->flags, ISSAMEDIR))
- di_write_unlock(a->dst_parent);
- else
- di_write_unlock2(a->src_parent, a->dst_parent);
- aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry);
- out_free:
- iput(a->dst_inode);
- if (a->thargs)
- au_whtmp_rmdir_free(a->thargs);
- kfree(a);
- out:
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode private data
- */
-
-#include "aufs.h"
-
-struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
-{
- struct inode *h_inode;
-
- IiMustAnyLock(inode);
-
- h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode;
- AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
- return h_inode;
-}
-
-/* todo: hard/soft set? */
-void au_hiput(struct au_hinode *hinode)
-{
- au_hn_free(hinode);
- dput(hinode->hi_whdentry);
- iput(hinode->hi_inode);
-}
-
-unsigned int au_hi_flags(struct inode *inode, int isdir)
-{
- unsigned int flags;
- const unsigned int mnt_flags = au_mntflags(inode->i_sb);
-
- flags = 0;
- if (au_opt_test(mnt_flags, XINO))
- au_fset_hi(flags, XINO);
- if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY))
- au_fset_hi(flags, HNOTIFY);
- return flags;
-}
-
-void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode, unsigned int flags)
-{
- struct au_hinode *hinode;
- struct inode *hi;
- struct au_iinfo *iinfo = au_ii(inode);
-
- IiMustWriteLock(inode);
-
- hinode = iinfo->ii_hinode + bindex;
- hi = hinode->hi_inode;
- AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
-
- if (hi)
- au_hiput(hinode);
- hinode->hi_inode = h_inode;
- if (h_inode) {
- int err;
- struct super_block *sb = inode->i_sb;
- struct au_branch *br;
-
- if (bindex == iinfo->ii_bstart)
- au_cpup_igen(inode, h_inode);
- br = au_sbr(sb, bindex);
- hinode->hi_id = br->br_id;
- if (au_ftest_hi(flags, XINO)) {
- err = au_xino_write(sb, bindex, h_inode->i_ino,
- inode->i_ino);
- if (unlikely(err))
- AuIOErr1("failed au_xino_write() %d\n", err);
- }
-
- if (au_ftest_hi(flags, HNOTIFY)
- && au_br_hnotifyable(br->br_perm)) {
- err = au_hn_alloc(hinode, inode, h_inode);
- if (unlikely(err))
- AuIOErr1("au_hn_alloc() %d\n", err);
- }
- }
-}
-
-void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_wh)
-{
- struct au_hinode *hinode;
-
- IiMustWriteLock(inode);
-
- hinode = au_ii(inode)->ii_hinode + bindex;
- AuDebugOn(hinode->hi_whdentry);
- hinode->hi_whdentry = h_wh;
-}
-
-void au_update_iigen(struct inode *inode)
-{
- atomic_set(&au_ii(inode)->ii_generation, au_sigen(inode->i_sb));
- /* smp_mb(); */ /* atomic_set */
-}
-
-/* it may be called at remount time, too */
-void au_update_ibrange(struct inode *inode, int do_put_zero)
-{
- struct au_iinfo *iinfo;
-
- iinfo = au_ii(inode);
- if (!iinfo || iinfo->ii_bstart < 0)
- return;
-
- IiMustWriteLock(inode);
-
- if (do_put_zero) {
- aufs_bindex_t bindex;
-
- for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
- bindex++) {
- struct inode *h_i;
-
- h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
- if (h_i && !h_i->i_nlink)
- au_set_h_iptr(inode, bindex, NULL, 0);
- }
- }
-
- iinfo->ii_bstart = -1;
- while (++iinfo->ii_bstart <= iinfo->ii_bend)
- if (iinfo->ii_hinode[0 + iinfo->ii_bstart].hi_inode)
- break;
- if (iinfo->ii_bstart > iinfo->ii_bend) {
- iinfo->ii_bstart = -1;
- iinfo->ii_bend = -1;
- return;
- }
-
- iinfo->ii_bend++;
- while (0 <= --iinfo->ii_bend)
- if (iinfo->ii_hinode[0 + iinfo->ii_bend].hi_inode)
- break;
- AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend || iinfo->ii_bend < 0);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_icntnr_init_once(void *_c)
-{
- struct au_icntnr *c = _c;
- struct au_iinfo *iinfo = &c->iinfo;
-
- au_rw_init(&iinfo->ii_rwsem);
- inode_init_once(&c->vfs_inode);
-}
-
-int au_iinfo_init(struct inode *inode)
-{
- struct au_iinfo *iinfo;
- struct super_block *sb;
- int nbr, i;
-
- sb = inode->i_sb;
- iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
- nbr = au_sbend(sb) + 1;
- if (unlikely(nbr <= 0))
- nbr = 1;
- iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
- if (iinfo->ii_hinode) {
- for (i = 0; i < nbr; i++)
- iinfo->ii_hinode[i].hi_id = -1;
-
- atomic_set(&iinfo->ii_generation, au_sigen(sb));
- /* smp_mb(); */ /* atomic_set */
- iinfo->ii_bstart = -1;
- iinfo->ii_bend = -1;
- iinfo->ii_vdir = NULL;
- return 0;
- }
- return -ENOMEM;
-}
-
-int au_ii_realloc(struct au_iinfo *iinfo, int nbr)
-{
- int err, sz;
- struct au_hinode *hip;
-
- AuRwMustWriteLock(&iinfo->ii_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*hip) * (iinfo->ii_bend + 1);
- if (!sz)
- sz = sizeof(*hip);
- hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS);
- if (hip) {
- iinfo->ii_hinode = hip;
- err = 0;
- }
-
- return err;
-}
-
-static int au_iinfo_write0(struct super_block *sb, struct au_hinode *hinode,
- ino_t ino)
-{
- int err;
- aufs_bindex_t bindex;
- unsigned char locked;
-
- err = 0;
- locked = !!si_noflush_read_trylock(sb);
- bindex = au_br_index(sb, hinode->hi_id);
- if (bindex >= 0)
- err = au_xino_write0(sb, bindex, hinode->hi_inode->i_ino, ino);
- /* error action? */
- if (locked)
- si_read_unlock(sb);
- return err;
-}
-
-void au_iinfo_fin(struct inode *inode)
-{
- ino_t ino;
- aufs_bindex_t bend;
- unsigned char unlinked = !inode->i_nlink;
- struct au_iinfo *iinfo;
- struct au_hinode *hi;
- struct super_block *sb;
-
- if (unlinked) {
- int err = au_xigen_inc(inode);
- if (unlikely(err))
- AuWarn1("failed resetting i_generation, %d\n", err);
- }
-
- iinfo = au_ii(inode);
- /* bad_inode case */
- if (!iinfo)
- return;
-
- if (iinfo->ii_vdir)
- au_vdir_free(iinfo->ii_vdir);
-
- if (iinfo->ii_bstart >= 0) {
- sb = inode->i_sb;
- ino = 0;
- if (unlinked)
- ino = inode->i_ino;
- hi = iinfo->ii_hinode + iinfo->ii_bstart;
- bend = iinfo->ii_bend;
- while (iinfo->ii_bstart++ <= bend) {
- if (hi->hi_inode) {
- if (unlinked || !hi->hi_inode->i_nlink) {
- au_iinfo_write0(sb, hi, ino);
- /* ignore this error */
- ino = 0;
- }
- au_hiput(hi);
- }
- hi++;
- }
- }
-
- kfree(iinfo->ii_hinode);
- AuRwDestroy(&iinfo->ii_rwsem);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef __AUFS_TYPE_H__
-#define __AUFS_TYPE_H__
-
-#include <linux/ioctl.h>
-/* for those who didn't "make headers_install" */
-#ifdef __KERNEL__
-#include <linux/kernel.h>
-#endif
-#include <linux/limits.h>
-#include <linux/types.h>
-
-#define AUFS_VERSION "2-standalone.tree-34-20100531"
-
-/* todo? move this to linux-2.6.19/include/magic.h */
-#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_BRANCH_MAX_127
-typedef __s8 aufs_bindex_t;
-#define AUFS_BRANCH_MAX 127
-#else
-typedef __s16 aufs_bindex_t;
-#ifdef CONFIG_AUFS_BRANCH_MAX_511
-#define AUFS_BRANCH_MAX 511
-#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
-#define AUFS_BRANCH_MAX 1023
-#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
-#define AUFS_BRANCH_MAX 32767
-#endif
-#endif
-
-#ifdef __KERNEL__
-#ifndef AUFS_BRANCH_MAX
-#error unknown CONFIG_AUFS_BRANCH_MAX value
-#endif
-#endif /* __KERNEL__ */
-
-/* ---------------------------------------------------------------------- */
-
-#define AUFS_NAME "aufs"
-#define AUFS_FSTYPE AUFS_NAME
-
-#define AUFS_ROOT_INO 2
-#define AUFS_FIRST_INO 11
-
-#define AUFS_WH_PFX ".wh."
-#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1)
-#define AUFS_WH_TMP_LEN 4
-/* a limit for rmdir/rename a dir */
-#define AUFS_MAX_NAMELEN (NAME_MAX \
- - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\
- - 1 /* dot */\
- - AUFS_WH_TMP_LEN) /* hex */
-#define AUFS_XINO_FNAME "." AUFS_NAME ".xino"
-#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME
-#define AUFS_XINO_TRUNC_INIT 64 /* blocks */
-#define AUFS_XINO_TRUNC_STEP 4 /* blocks */
-#define AUFS_DIRWH_DEF 3
-#define AUFS_RDCACHE_DEF 10 /* seconds */
-#define AUFS_RDBLK_DEF 512 /* bytes */
-#define AUFS_RDHASH_DEF 32
-#define AUFS_WKQ_NAME AUFS_NAME "d"
-#define AUFS_MFS_SECOND_DEF 30 /* seconds */
-#define AUFS_PLINK_WARN 100 /* number of plinks */
-
-#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */
-#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME
-
-#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME
-#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk"
-#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph"
-
-/* doubly whiteouted */
-#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME
-#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME
-#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME
-
-/* branch permission */
-#define AUFS_BRPERM_RW "rw"
-#define AUFS_BRPERM_RO "ro"
-#define AUFS_BRPERM_RR "rr"
-#define AUFS_BRPERM_WH "wh"
-#define AUFS_BRPERM_NLWH "nolwh"
-#define AUFS_BRPERM_ROWH AUFS_BRPERM_RO "+" AUFS_BRPERM_WH
-#define AUFS_BRPERM_RRWH AUFS_BRPERM_RR "+" AUFS_BRPERM_WH
-#define AUFS_BRPERM_RWNLWH AUFS_BRPERM_RW "+" AUFS_BRPERM_NLWH
-
-/* ---------------------------------------------------------------------- */
-
-/* ioctl */
-enum {
- AuCtl_PLINK_MAINT,
- AuCtl_PLINK_CLEAN,
-
- /* readdir in userspace */
- AuCtl_RDU,
- AuCtl_RDU_INO,
-
- /* pathconf wrapper */
- AuCtl_WBR_FD
-};
-
-/* borrowed from linux/include/linux/kernel.h */
-#ifndef ALIGN
-#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
-#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
-#endif
-
-/* borrowed from linux/include/linux/compiler-gcc3.h */
-#ifndef __aligned
-#define __aligned(x) __attribute__((aligned(x)))
-#define __packed __attribute__((packed))
-#endif
-
-struct au_rdu_cookie {
- __u64 h_pos;
- __s16 bindex;
- __u8 flags;
- __u8 pad;
- __u32 generation;
-} __aligned(8);
-
-struct au_rdu_ent {
- __u64 ino;
- __s16 bindex;
- __u8 type;
- __u8 nlen;
- __u8 wh;
- char name[0];
-} __aligned(8);
-
-static inline int au_rdu_len(int nlen)
-{
- /* include the terminating NULL */
- return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
- sizeof(__u64));
-}
-
-union au_rdu_ent_ul {
- struct au_rdu_ent __user *e;
- unsigned long ul;
-};
-
-enum {
- AufsCtlRduV_SZ,
- AufsCtlRduV_SZ_PTR,
- AufsCtlRduV_End
-};
-
-struct aufs_rdu {
- /* input */
- union {
- __u64 sz; /* AuCtl_RDU */
- __u64 nent; /* AuCtl_RDU_INO */
- };
- union au_rdu_ent_ul ent;
- __u16 verify[AufsCtlRduV_End];
-
- /* input/output */
- __u32 blk;
-
- /* output */
- union au_rdu_ent_ul tail;
- /* number of entries which were added in a single call */
- __u64 rent;
- __u8 full;
- __u8 shwh;
-
- struct au_rdu_cookie cookie;
-} __aligned(8);
-
-#define AuCtlType 'A'
-#define AUFS_CTL_PLINK_MAINT _IO(AuCtlType, AuCtl_PLINK_MAINT)
-#define AUFS_CTL_PLINK_CLEAN _IO(AuCtlType, AuCtl_PLINK_CLEAN)
-#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
-#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
-#define AUFS_CTL_WBR_FD _IO(AuCtlType, AuCtl_WBR_FD)
-
-#endif /* __AUFS_TYPE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode functions
- */
-
-#include "aufs.h"
-
-struct inode *au_igrab(struct inode *inode)
-{
- if (inode) {
- AuDebugOn(!atomic_read(&inode->i_count));
- atomic_inc_return(&inode->i_count);
- }
- return inode;
-}
-
-static void au_refresh_hinode_attr(struct inode *inode, int do_version)
-{
- au_cpup_attr_all(inode, /*force*/0);
- au_update_iigen(inode);
- if (do_version)
- inode->i_version++;
-}
-
-int au_refresh_hinode_self(struct inode *inode, int do_attr)
-{
- int err, e;
- aufs_bindex_t bindex, new_bindex;
- unsigned char update;
- struct au_hinode *p, *q, tmp;
- struct super_block *sb;
- struct au_iinfo *iinfo;
-
- IiMustWriteLock(inode);
-
- update = 0;
- sb = inode->i_sb;
- iinfo = au_ii(inode);
- err = au_ii_realloc(iinfo, au_sbend(sb) + 1);
- if (unlikely(err))
- goto out;
-
- p = iinfo->ii_hinode + iinfo->ii_bstart;
- err = 0;
- for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
- bindex++, p++) {
- if (!p->hi_inode)
- continue;
-
- new_bindex = au_br_index(sb, p->hi_id);
- if (new_bindex == bindex)
- continue;
-
- if (new_bindex < 0) {
- update = 1;
- au_hiput(p);
- p->hi_inode = NULL;
- continue;
- }
-
- if (new_bindex < iinfo->ii_bstart)
- iinfo->ii_bstart = new_bindex;
- if (iinfo->ii_bend < new_bindex)
- iinfo->ii_bend = new_bindex;
- /* swap two lower inode, and loop again */
- q = iinfo->ii_hinode + new_bindex;
- tmp = *q;
- *q = *p;
- *p = tmp;
- if (tmp.hi_inode) {
- bindex--;
- p--;
- }
- }
- au_update_ibrange(inode, /*do_put_zero*/0);
- e = au_dy_irefresh(inode);
- if (unlikely(e && !err))
- err = e;
- if (do_attr)
- au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode));
-
- out:
- return err;
-}
-
-int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
-{
- int err, e;
- unsigned int flags;
- aufs_bindex_t bindex, bend;
- unsigned char isdir, update;
- struct au_hinode *p;
- struct au_iinfo *iinfo;
-
- err = au_refresh_hinode_self(inode, /*do_attr*/0);
- if (unlikely(err))
- goto out;
-
- update = 0;
- iinfo = au_ii(inode);
- p = iinfo->ii_hinode + iinfo->ii_bstart;
- isdir = S_ISDIR(inode->i_mode);
- flags = au_hi_flags(inode, isdir);
- bend = au_dbend(dentry);
- for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
- struct inode *h_i;
- struct dentry *h_d;
-
- h_d = au_h_dptr(dentry, bindex);
- if (!h_d || !h_d->d_inode)
- continue;
-
- if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
- h_i = au_h_iptr(inode, bindex);
- if (h_i) {
- if (h_i == h_d->d_inode)
- continue;
- err = -EIO;
- break;
- }
- }
- if (bindex < iinfo->ii_bstart)
- iinfo->ii_bstart = bindex;
- if (iinfo->ii_bend < bindex)
- iinfo->ii_bend = bindex;
- au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags);
- update = 1;
- }
- au_update_ibrange(inode, /*do_put_zero*/0);
- e = au_dy_irefresh(inode);
- if (unlikely(e && !err))
- err = e;
- au_refresh_hinode_attr(inode, update && isdir);
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-static int set_inode(struct inode *inode, struct dentry *dentry)
-{
- int err;
- unsigned int flags;
- umode_t mode;
- aufs_bindex_t bindex, bstart, btail;
- unsigned char isdir;
- struct dentry *h_dentry;
- struct inode *h_inode;
- struct au_iinfo *iinfo;
-
- IiMustWriteLock(inode);
-
- err = 0;
- isdir = 0;
- bstart = au_dbstart(dentry);
- h_inode = au_h_dptr(dentry, bstart)->d_inode;
- mode = h_inode->i_mode;
- switch (mode & S_IFMT) {
- case S_IFREG:
- btail = au_dbtail(dentry);
- inode->i_op = &aufs_iop;
- inode->i_fop = &aufs_file_fop;
- err = au_dy_iaop(inode, bstart, h_inode);
- if (unlikely(err))
- goto out;
- break;
- case S_IFDIR:
- isdir = 1;
- btail = au_dbtaildir(dentry);
- inode->i_op = &aufs_dir_iop;
- inode->i_fop = &aufs_dir_fop;
- break;
- case S_IFLNK:
- btail = au_dbtail(dentry);
- inode->i_op = &aufs_symlink_iop;
- break;
- case S_IFBLK:
- case S_IFCHR:
- case S_IFIFO:
- case S_IFSOCK:
- btail = au_dbtail(dentry);
- inode->i_op = &aufs_iop;
- au_init_special_fop(inode, mode, h_inode->i_rdev);
- break;
- default:
- AuIOErr("Unknown file type 0%o\n", mode);
- err = -EIO;
- goto out;
- }
-
- /* do not set hnotify for whiteouted dirs (SHWH mode) */
- flags = au_hi_flags(inode, isdir);
- if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)
- && au_ftest_hi(flags, HNOTIFY)
- && dentry->d_name.len > AUFS_WH_PFX_LEN
- && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
- au_fclr_hi(flags, HNOTIFY);
- iinfo = au_ii(inode);
- iinfo->ii_bstart = bstart;
- iinfo->ii_bend = btail;
- for (bindex = bstart; bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry)
- au_set_h_iptr(inode, bindex,
- au_igrab(h_dentry->d_inode), flags);
- }
- au_cpup_attr_all(inode, /*force*/1);
-
- out:
- return err;
-}
-
-/* successful returns with iinfo write_locked */
-static int reval_inode(struct inode *inode, struct dentry *dentry, int *matched)
-{
- int err;
- aufs_bindex_t bindex, bend;
- struct inode *h_inode, *h_dinode;
-
- *matched = 0;
-
- /*
- * before this function, if aufs got any iinfo lock, it must be only
- * one, the parent dir.
- * it can happen by UDBA and the obsoleted inode number.
- */
- err = -EIO;
- if (unlikely(inode->i_ino == parent_ino(dentry)))
- goto out;
-
- err = 0;
- ii_write_lock_new_child(inode);
- h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode;
- bend = au_ibend(inode);
- for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
- h_inode = au_h_iptr(inode, bindex);
- if (h_inode && h_inode == h_dinode) {
- *matched = 1;
- err = 0;
- if (au_iigen(inode) != au_digen(dentry))
- err = au_refresh_hinode(inode, dentry);
- break;
- }
- }
-
- if (unlikely(err))
- ii_write_unlock(inode);
- out:
- return err;
-}
-
-int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- unsigned int d_type, ino_t *ino)
-{
- int err;
- struct mutex *mtx;
- const int isdir = (d_type == DT_DIR);
-
- /* prevent hardlinks from race condition */
- mtx = NULL;
- if (!isdir) {
- mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx;
- mutex_lock(mtx);
- }
- err = au_xino_read(sb, bindex, h_ino, ino);
- if (unlikely(err))
- goto out;
-
- if (!*ino) {
- err = -EIO;
- *ino = au_xino_new_ino(sb);
- if (unlikely(!*ino))
- goto out;
- err = au_xino_write(sb, bindex, h_ino, *ino);
- if (unlikely(err))
- goto out;
- }
-
- out:
- if (!isdir)
- mutex_unlock(mtx);
- return err;
-}
-
-/* successful returns with iinfo write_locked */
-/* todo: return with unlocked? */
-struct inode *au_new_inode(struct dentry *dentry, int must_new)
-{
- struct inode *inode;
- struct dentry *h_dentry;
- struct super_block *sb;
- ino_t h_ino, ino;
- int err, match;
- aufs_bindex_t bstart;
-
- sb = dentry->d_sb;
- bstart = au_dbstart(dentry);
- h_dentry = au_h_dptr(dentry, bstart);
- h_ino = h_dentry->d_inode->i_ino;
- err = au_xino_read(sb, bstart, h_ino, &ino);
- inode = ERR_PTR(err);
- if (unlikely(err))
- goto out;
- new_ino:
- if (!ino) {
- ino = au_xino_new_ino(sb);
- if (unlikely(!ino)) {
- inode = ERR_PTR(-EIO);
- goto out;
- }
- }
-
- AuDbg("i%lu\n", (unsigned long)ino);
- inode = au_iget_locked(sb, ino);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out;
-
- AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
- if (inode->i_state & I_NEW) {
- ii_write_lock_new_child(inode);
- err = set_inode(inode, dentry);
- if (!err) {
- unlock_new_inode(inode);
- goto out; /* success */
- }
-
- ii_write_unlock(inode);
- iget_failed(inode);
- goto out_err;
- } else if (!must_new) {
- err = reval_inode(inode, dentry, &match);
- if (!err)
- goto out; /* success */
- else if (match)
- goto out_iput;
- }
-
- if (unlikely(au_test_fs_unique_ino(h_dentry->d_inode)))
- AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir,"
- " b%d, %s, %.*s, hi%lu, i%lu.\n",
- bstart, au_sbtype(h_dentry->d_sb), AuDLNPair(dentry),
- (unsigned long)h_ino, (unsigned long)ino);
- ino = 0;
- err = au_xino_write(sb, bstart, h_ino, /*ino*/0);
- if (!err) {
- iput(inode);
- goto new_ino;
- }
-
- out_iput:
- iput(inode);
- out_err:
- inode = ERR_PTR(err);
- out:
- return inode;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
- struct inode *inode)
-{
- int err;
-
- err = au_br_rdonly(au_sbr(sb, bindex));
-
- /* pseudo-link after flushed may happen out of bounds */
- if (!err
- && inode
- && au_ibstart(inode) <= bindex
- && bindex <= au_ibend(inode)) {
- /*
- * permission check is unnecessary since vfsub routine
- * will be called later
- */
- struct inode *hi = au_h_iptr(inode, bindex);
- if (hi)
- err = IS_IMMUTABLE(hi) ? -EROFS : 0;
- }
-
- return err;
-}
-
-int au_test_h_perm(struct inode *h_inode, int mask)
-{
- if (!current_fsuid())
- return 0;
- return inode_permission(h_inode, mask);
-}
-
-int au_test_h_perm_sio(struct inode *h_inode, int mask)
-{
- if (au_test_nfs(h_inode->i_sb)
- && (mask & MAY_WRITE)
- && S_ISDIR(h_inode->i_mode))
- mask |= MAY_READ; /* force permission check */
- return au_test_h_perm(h_inode, mask);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * inode operations
- */
-
-#ifndef __AUFS_INODE_H__
-#define __AUFS_INODE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/fsnotify.h>
-#include <linux/aufs_type.h>
-#include "rwsem.h"
-
-struct vfsmount;
-
-struct au_hnotify {
-#ifdef CONFIG_AUFS_HNOTIFY
-#ifdef CONFIG_AUFS_HFSNOTIFY
- struct fsnotify_mark_entry hn_entry;
-#else
- struct inotify_watch hn_watch;
-#endif
- struct inode *hn_aufs_inode; /* no get/put */
-#endif
-} ____cacheline_aligned_in_smp;
-
-struct au_hinode {
- struct inode *hi_inode;
- aufs_bindex_t hi_id;
-#ifdef CONFIG_AUFS_HNOTIFY
- struct au_hnotify *hi_notify;
-#endif
-
- /* reference to the copied-up whiteout with get/put */
- struct dentry *hi_whdentry;
-};
-
-struct au_vdir;
-struct au_iinfo {
- atomic_t ii_generation;
- struct super_block *ii_hsb1; /* no get/put */
-
- struct au_rwsem ii_rwsem;
- aufs_bindex_t ii_bstart, ii_bend;
- __u32 ii_higen;
- struct au_hinode *ii_hinode;
- struct au_vdir *ii_vdir;
-};
-
-struct au_icntnr {
- struct au_iinfo iinfo;
- struct inode vfs_inode;
-} ____cacheline_aligned_in_smp;
-
-/* au_pin flags */
-#define AuPin_DI_LOCKED 1
-#define AuPin_MNT_WRITE (1 << 1)
-#define au_ftest_pin(flags, name) ((flags) & AuPin_##name)
-#define au_fset_pin(flags, name) { (flags) |= AuPin_##name; }
-#define au_fclr_pin(flags, name) { (flags) &= ~AuPin_##name; }
-
-struct au_pin {
- /* input */
- struct dentry *dentry;
- unsigned int udba;
- unsigned char lsc_di, lsc_hi, flags;
- aufs_bindex_t bindex;
-
- /* output */
- struct dentry *parent;
- struct au_hinode *hdir;
- struct vfsmount *h_mnt;
-};
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_iinfo *au_ii(struct inode *inode)
-{
- struct au_iinfo *iinfo;
-
- iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
- if (iinfo->ii_hinode)
- return iinfo;
- return NULL; /* debugging bad_inode case */
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* inode.c */
-struct inode *au_igrab(struct inode *inode);
-int au_refresh_hinode_self(struct inode *inode, int do_attr);
-int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
-int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- unsigned int d_type, ino_t *ino);
-struct inode *au_new_inode(struct dentry *dentry, int must_new);
-int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
- struct inode *inode);
-int au_test_h_perm(struct inode *h_inode, int mask);
-int au_test_h_perm_sio(struct inode *h_inode, int mask);
-
-static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex,
- ino_t h_ino, unsigned int d_type, ino_t *ino)
-{
-#ifdef CONFIG_AUFS_SHWH
- return au_ino(sb, bindex, h_ino, d_type, ino);
-#else
- return 0;
-#endif
-}
-
-/* i_op.c */
-extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
-
-/* au_wr_dir flags */
-#define AuWrDir_ADD_ENTRY 1
-#define AuWrDir_ISDIR (1 << 1)
-#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
-#define au_fset_wrdir(flags, name) { (flags) |= AuWrDir_##name; }
-#define au_fclr_wrdir(flags, name) { (flags) &= ~AuWrDir_##name; }
-
-struct au_wr_dir_args {
- aufs_bindex_t force_btgt;
- unsigned char flags;
-};
-int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
- struct au_wr_dir_args *args);
-
-struct dentry *au_pinned_h_parent(struct au_pin *pin);
-void au_pin_init(struct au_pin *pin, struct dentry *dentry,
- aufs_bindex_t bindex, int lsc_di, int lsc_hi,
- unsigned int udba, unsigned char flags);
-int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int udba, unsigned char flags) __must_check;
-int au_do_pin(struct au_pin *pin) __must_check;
-void au_unpin(struct au_pin *pin);
-
-/* i_op_add.c */
-int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir);
-int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
-int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
-int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *nd);
-int aufs_link(struct dentry *src_dentry, struct inode *dir,
- struct dentry *dentry);
-int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
-
-/* i_op_del.c */
-int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup);
-int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir);
-int aufs_unlink(struct inode *dir, struct dentry *dentry);
-int aufs_rmdir(struct inode *dir, struct dentry *dentry);
-
-/* i_op_ren.c */
-int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
-int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
- struct inode *dir, struct dentry *dentry);
-
-/* iinfo.c */
-struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
-void au_hiput(struct au_hinode *hinode);
-void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_wh);
-unsigned int au_hi_flags(struct inode *inode, int isdir);
-
-/* hinode flags */
-#define AuHi_XINO 1
-#define AuHi_HNOTIFY (1 << 1)
-#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
-#define au_fset_hi(flags, name) { (flags) |= AuHi_##name; }
-#define au_fclr_hi(flags, name) { (flags) &= ~AuHi_##name; }
-
-#ifndef CONFIG_AUFS_HNOTIFY
-#undef AuHi_HNOTIFY
-#define AuHi_HNOTIFY 0
-#endif
-
-void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode, unsigned int flags);
-
-void au_update_iigen(struct inode *inode);
-void au_update_ibrange(struct inode *inode, int do_put_zero);
-
-void au_icntnr_init_once(void *_c);
-int au_iinfo_init(struct inode *inode);
-void au_iinfo_fin(struct inode *inode);
-int au_ii_realloc(struct au_iinfo *iinfo, int nbr);
-
-/* plink.c */
-void au_plink_maint_block(struct super_block *sb);
-void au_plink_maint_leave(struct file *file);
-#ifdef CONFIG_AUFS_DEBUG
-void au_plink_list(struct super_block *sb);
-#else
-AuStubVoid(au_plink_list, struct super_block *sb)
-#endif
-int au_plink_test(struct inode *inode);
-struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex);
-void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_dentry);
-void au_plink_put(struct super_block *sb);
-void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
-long au_plink_ioctl(struct file *file, unsigned int cmd);
-
-/* ---------------------------------------------------------------------- */
-
-/* lock subclass for iinfo */
-enum {
- AuLsc_II_CHILD, /* child first */
- AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */
- AuLsc_II_CHILD3, /* copyup dirs */
- AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */
- AuLsc_II_PARENT2,
- AuLsc_II_PARENT3, /* copyup dirs */
- AuLsc_II_NEW_CHILD
-};
-
-/*
- * ii_read_lock_child, ii_write_lock_child,
- * ii_read_lock_child2, ii_write_lock_child2,
- * ii_read_lock_child3, ii_write_lock_child3,
- * ii_read_lock_parent, ii_write_lock_parent,
- * ii_read_lock_parent2, ii_write_lock_parent2,
- * ii_read_lock_parent3, ii_write_lock_parent3,
- * ii_read_lock_new_child, ii_write_lock_new_child,
- */
-#define AuReadLockFunc(name, lsc) \
-static inline void ii_read_lock_##name(struct inode *i) \
-{ \
- au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
-}
-
-#define AuWriteLockFunc(name, lsc) \
-static inline void ii_write_lock_##name(struct inode *i) \
-{ \
- au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
-}
-
-#define AuRWLockFuncs(name, lsc) \
- AuReadLockFunc(name, lsc) \
- AuWriteLockFunc(name, lsc)
-
-AuRWLockFuncs(child, CHILD);
-AuRWLockFuncs(child2, CHILD2);
-AuRWLockFuncs(child3, CHILD3);
-AuRWLockFuncs(parent, PARENT);
-AuRWLockFuncs(parent2, PARENT2);
-AuRWLockFuncs(parent3, PARENT3);
-AuRWLockFuncs(new_child, NEW_CHILD);
-
-#undef AuReadLockFunc
-#undef AuWriteLockFunc
-#undef AuRWLockFuncs
-
-/*
- * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
- */
-AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem);
-
-#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
-#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem)
-#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-static inline unsigned int au_iigen(struct inode *inode)
-{
- return atomic_read(&au_ii(inode)->ii_generation);
-}
-
-/* tiny test for inode number */
-/* tmpfs generation is too rough */
-static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
-{
- struct au_iinfo *iinfo;
-
- iinfo = au_ii(inode);
- AuRwMustAnyLock(&iinfo->ii_rwsem);
- return !(iinfo->ii_hsb1 == h_inode->i_sb
- && iinfo->ii_higen == h_inode->i_generation);
-}
-
-static inline void au_iigen_dec(struct inode *inode)
-{
-#ifdef CONFIG_AUFS_HNOTIFY
- atomic_dec_return(&au_ii(inode)->ii_generation);
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline aufs_bindex_t au_ii_br_id(struct inode *inode,
- aufs_bindex_t bindex)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_hinode[0 + bindex].hi_id;
-}
-
-static inline aufs_bindex_t au_ibstart(struct inode *inode)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_bstart;
-}
-
-static inline aufs_bindex_t au_ibend(struct inode *inode)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_bend;
-}
-
-static inline struct au_vdir *au_ivdir(struct inode *inode)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_vdir;
-}
-
-static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry;
-}
-
-static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustWriteLock(inode);
- au_ii(inode)->ii_bstart = bindex;
-}
-
-static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustWriteLock(inode);
- au_ii(inode)->ii_bend = bindex;
-}
-
-static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
-{
- IiMustWriteLock(inode);
- au_ii(inode)->ii_vdir = vdir;
-}
-
-static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_hinode + bindex;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct dentry *au_pinned_parent(struct au_pin *pin)
-{
- if (pin)
- return pin->parent;
- return NULL;
-}
-
-static inline struct inode *au_pinned_h_dir(struct au_pin *pin)
-{
- if (pin && pin->hdir)
- return pin->hdir->hi_inode;
- return NULL;
-}
-
-static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin)
-{
- if (pin)
- return pin->hdir;
- return NULL;
-}
-
-static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry)
-{
- if (pin)
- pin->dentry = dentry;
-}
-
-static inline void au_pin_set_parent_lflag(struct au_pin *pin,
- unsigned char lflag)
-{
- if (pin) {
- /* dirty macros require brackets */
- if (lflag) {
- au_fset_pin(pin->flags, DI_LOCKED);
- } else {
- au_fclr_pin(pin->flags, DI_LOCKED);
- }
- }
-}
-
-static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent)
-{
- if (pin) {
- dput(pin->parent);
- pin->parent = dget(parent);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_HNOTIFY
-struct au_hnotify_op {
- void (*ctl)(struct au_hinode *hinode, int do_set);
- int (*alloc)(struct au_hnotify *hn, struct inode *h_inode);
- void (*free)(struct au_hnotify *hn);
-
- void (*fin)(void);
- int (*init)(void);
-};
-
-/* hnotify.c */
-int au_hn_alloc(struct au_hinode *hinode, struct inode *inode,
- struct inode *h_inode);
-void au_hn_free(struct au_hinode *hinode);
-void au_hn_ctl(struct au_hinode *hinode, int do_set);
-void au_hn_reset(struct inode *inode, unsigned int flags);
-int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
- struct qstr *h_child_qstr, struct inode *h_child_inode);
-int __init au_hnotify_init(void);
-void au_hnotify_fin(void);
-
-/* hinotify.c */
-extern const struct au_hnotify_op au_hnotify_op;
-
-static inline
-void au_hn_init(struct au_hinode *hinode)
-{
- hinode->hi_notify = NULL;
-}
-
-#else
-static inline
-int au_hn_alloc(struct au_hinode *hinode __maybe_unused,
- struct inode *inode __maybe_unused,
- struct inode *h_inode __maybe_unused)
-{
- return -EOPNOTSUPP;
-}
-
-AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused)
-AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused,
- int do_set __maybe_unused)
-AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused,
- unsigned int flags __maybe_unused)
-AuStubInt0(__init au_hnotify_init, void)
-AuStubVoid(au_hnotify_fin, void)
-AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused)
-#endif /* CONFIG_AUFS_HNOTIFY */
-
-static inline void au_hn_suspend(struct au_hinode *hdir)
-{
- au_hn_ctl(hdir, /*do_set*/0);
-}
-
-static inline void au_hn_resume(struct au_hinode *hdir)
-{
- au_hn_ctl(hdir, /*do_set*/1);
-}
-
-static inline void au_hn_imtx_lock(struct au_hinode *hdir)
-{
- mutex_lock(&hdir->hi_inode->i_mutex);
- au_hn_suspend(hdir);
-}
-
-static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir,
- unsigned int sc __maybe_unused)
-{
- mutex_lock_nested(&hdir->hi_inode->i_mutex, sc);
- au_hn_suspend(hdir);
-}
-
-static inline void au_hn_imtx_unlock(struct au_hinode *hdir)
-{
- au_hn_resume(hdir);
- mutex_unlock(&hdir->hi_inode->i_mutex);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_INODE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * ioctl
- * plink-management and readdir in userspace.
- * assist the pathconf(3) wrapper library.
- */
-
-#include <linux/file.h>
-#include "aufs.h"
-
-static int au_wbr_fd(struct path *path)
-{
- int err, fd;
- aufs_bindex_t wbi, bindex, bend;
- struct file *h_file;
- struct super_block *sb;
- struct dentry *root;
- struct au_branch *wbr;
-
- err = get_unused_fd();
- if (unlikely(err < 0))
- goto out;
- fd = err;
-
- wbi = 0;
- sb = path->dentry->d_sb;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_IR);
- wbr = au_sbr(sb, wbi);
- if (!(path->mnt->mnt_flags & MNT_READONLY)
- && !au_br_writable(wbr->br_perm)) {
- bend = au_sbend(sb);
- for (bindex = 1; bindex <= bend; bindex++) {
- wbr = au_sbr(sb, bindex);
- if (au_br_writable(wbr->br_perm)) {
- wbi = bindex;
- break;
- }
- }
- wbr = au_sbr(sb, wbi);
- }
- AuDbg("wbi %d\n", wbi);
- h_file = au_h_open(root, wbi, O_RDONLY | O_DIRECTORY | O_LARGEFILE,
- NULL);
- aufs_read_unlock(root, AuLock_IR);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out_fd;
-
- atomic_dec(&wbr->br_count); /* cf. au_h_open() */
- fd_install(fd, h_file);
- err = fd;
- goto out; /* success */
-
- out_fd:
- put_unused_fd(fd);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err;
-
- switch (cmd) {
- case AUFS_CTL_PLINK_MAINT:
- case AUFS_CTL_PLINK_CLEAN:
- err = au_plink_ioctl(file, cmd);
- break;
-
- case AUFS_CTL_RDU:
- case AUFS_CTL_RDU_INO:
- err = au_rdu_ioctl(file, cmd, arg);
- break;
-
- case AUFS_CTL_WBR_FD:
- err = au_wbr_fd(&file->f_path);
- break;
-
- default:
- /* do not call the lower */
- AuDbg("0x%x\n", cmd);
- err = -ENOTTY;
- }
-
- AuTraceErr(err);
- return err;
-}
-
-long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err;
-
- switch (cmd) {
- case AUFS_CTL_WBR_FD:
- err = au_wbr_fd(&file->f_path);
- break;
-
- default:
- /* do not call the lower */
- AuDbg("0x%x\n", cmd);
- err = -ENOTTY;
- }
-
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * support for loopback block device as a branch
- */
-
-#include <linux/loop.h>
-#include "aufs.h"
-
-/*
- * test if two lower dentries have overlapping branches.
- */
-int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_d1,
- struct dentry *h_d2)
-{
- struct inode *h_inode;
- struct loop_device *l;
-
- h_inode = h_d1->d_inode;
- if (MAJOR(h_inode->i_sb->s_dev) != LOOP_MAJOR)
- return 0;
-
- l = h_inode->i_sb->s_bdev->bd_disk->private_data;
- h_d1 = l->lo_backing_file->f_dentry;
- /* h_d1 can be local NFS. in this case aufs cannot detect the loop */
- if (unlikely(h_d1->d_sb == sb))
- return 1;
- return au_test_subdir(h_d1, h_d2);
-}
-
-/* true if a kernel thread named 'loop[0-9].*' accesses a file */
-int au_test_loopback_kthread(void)
-{
- const char c = current->comm[4];
-
- return current->mm == NULL
- && '0' <= c && c <= '9'
- && strncmp(current->comm, "loop", 4) == 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * support for loopback mount as a branch
- */
-
-#ifndef __AUFS_LOOP_H__
-#define __AUFS_LOOP_H__
-
-#ifdef __KERNEL__
-
-struct dentry;
-struct super_block;
-
-#ifdef CONFIG_AUFS_BDEV_LOOP
-/* loop.c */
-int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_d1,
- struct dentry *h_d2);
-int au_test_loopback_kthread(void);
-#else
-AuStubInt0(au_test_loopback_overlap, struct super_block *sb,
- struct dentry *h_d1, struct dentry *h_d2)
-AuStubInt0(au_test_loopback_kthread, void)
-#endif /* BLK_DEV_LOOP */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_LOOP_H__ */
+++ /dev/null
-
-# defined in ${srctree}/fs/fuse/inode.c
-# tristate
-ifdef CONFIG_FUSE_FS
-ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546
-endif
-
-# defined in ${srctree}/fs/ocfs2/ocfs2_fs.h
-# tristate
-ifdef CONFIG_OCFS2_FS
-ccflags-y += -DOCFS2_SUPER_MAGIC=0x7461636f
-endif
-
-# defined in ${srctree}/fs/ocfs2/dlm/userdlm.h
-# tristate
-ifdef CONFIG_OCFS2_FS_O2CB
-ccflags-y += -DDLMFS_MAGIC=0x76a9f425
-endif
-
-# defined in ${srctree}/fs/cifs/cifsfs.c
-# tristate
-ifdef CONFIG_CIFS_FS
-ccflags-y += -DCIFS_MAGIC_NUMBER=0xFF534D42
-endif
-
-# defined in ${srctree}/fs/xfs/xfs_sb.h
-# tristate
-ifdef CONFIG_XFS_FS
-ccflags-y += -DXFS_SB_MAGIC=0x58465342
-endif
-
-# defined in ${srctree}/fs/configfs/mount.c
-# tristate
-ifdef CONFIG_CONFIGFS_FS
-ccflags-y += -DCONFIGFS_MAGIC=0x62656570
-endif
-
-# defined in ${srctree}/fs/9p/v9fs.h
-# tristate
-ifdef CONFIG_9P_FS
-ccflags-y += -DV9FS_MAGIC=0x01021997
-endif
-
-# defined in ${srctree}/fs/ubifs/ubifs.h
-# tristate
-ifdef CONFIG_UBIFS_FS
-ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905
-endif
-
-# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h
-# tristate
-ifdef CONFIG_HFSPLUS_FS
-ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b
-endif
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * module global variables and operations
- */
-
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include "aufs.h"
-
-void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
-{
- if (new_sz <= nused)
- return p;
-
- p = krealloc(p, new_sz, gfp);
- if (p)
- memset(p + nused, 0, new_sz - nused);
- return p;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * aufs caches
- */
-struct kmem_cache *au_cachep[AuCache_Last];
-static int __init au_cache_init(void)
-{
- au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once);
- if (au_cachep[AuCache_DINFO])
- au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr,
- au_icntnr_init_once);
- if (au_cachep[AuCache_ICNTNR])
- au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo,
- au_fi_init_once);
- if (au_cachep[AuCache_FINFO])
- au_cachep[AuCache_VDIR] = AuCache(au_vdir);
- if (au_cachep[AuCache_VDIR])
- au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr);
- if (au_cachep[AuCache_DEHSTR])
- return 0;
-
- return -ENOMEM;
-}
-
-static void au_cache_fin(void)
-{
- int i;
-
- /* including AuCache_HNOTIFY */
- for (i = 0; i < AuCache_Last; i++)
- if (au_cachep[i]) {
- kmem_cache_destroy(au_cachep[i]);
- au_cachep[i] = NULL;
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_dir_roflags;
-
-/*
- * functions for module interface.
- */
-MODULE_LICENSE("GPL");
-/* MODULE_LICENSE("GPL v2"); */
-MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
-MODULE_DESCRIPTION(AUFS_NAME
- " -- Advanced multi layered unification filesystem");
-MODULE_VERSION(AUFS_VERSION);
-
-/* this module parameter has no meaning when SYSFS is disabled */
-int sysaufs_brs = 1;
-MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
-module_param_named(brs, sysaufs_brs, int, S_IRUGO);
-
-/* ---------------------------------------------------------------------- */
-
-static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
-
-int au_seq_path(struct seq_file *seq, struct path *path)
-{
- return seq_path(seq, path, au_esc_chars);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int __init aufs_init(void)
-{
- int err, i;
- char *p;
-
- p = au_esc_chars;
- for (i = 1; i <= ' '; i++)
- *p++ = i;
- *p++ = '\\';
- *p++ = '\x7f';
- *p = 0;
-
- au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
-
- sysaufs_brs_init();
- au_debug_init();
- au_dy_init();
- err = sysaufs_init();
- if (unlikely(err))
- goto out;
- err = au_wkq_init();
- if (unlikely(err))
- goto out_sysaufs;
- err = au_hnotify_init();
- if (unlikely(err))
- goto out_wkq;
- err = au_sysrq_init();
- if (unlikely(err))
- goto out_hin;
- err = au_cache_init();
- if (unlikely(err))
- goto out_sysrq;
- err = register_filesystem(&aufs_fs_type);
- if (unlikely(err))
- goto out_cache;
- /* since we define pr_fmt, call printk directly */
- printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n");
- goto out; /* success */
-
- out_cache:
- au_cache_fin();
- out_sysrq:
- au_sysrq_fin();
- out_hin:
- au_hnotify_fin();
- out_wkq:
- au_wkq_fin();
- out_sysaufs:
- sysaufs_fin();
- au_dy_fin();
- out:
- return err;
-}
-
-static void __exit aufs_exit(void)
-{
- unregister_filesystem(&aufs_fs_type);
- au_cache_fin();
- au_sysrq_fin();
- au_hnotify_fin();
- au_wkq_fin();
- sysaufs_fin();
- au_dy_fin();
-}
-
-module_init(aufs_init);
-module_exit(aufs_exit);
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * module initialization and module-global
- */
-
-#ifndef __AUFS_MODULE_H__
-#define __AUFS_MODULE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/slab.h>
-
-struct path;
-struct seq_file;
-
-/* module parameters */
-extern int sysaufs_brs;
-
-/* ---------------------------------------------------------------------- */
-
-extern int au_dir_roflags;
-
-void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp);
-int au_seq_path(struct seq_file *seq, struct path *path);
-
-/* ---------------------------------------------------------------------- */
-
-/* kmem cache */
-enum {
- AuCache_DINFO,
- AuCache_ICNTNR,
- AuCache_FINFO,
- AuCache_VDIR,
- AuCache_DEHSTR,
-#ifdef CONFIG_AUFS_HNOTIFY
- AuCache_HNOTIFY,
-#endif
- AuCache_Last
-};
-
-#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD)
-#define AuCache(type) KMEM_CACHE(type, AuCacheFlags)
-#define AuCacheCtor(type, ctor) \
- kmem_cache_create(#type, sizeof(struct type), \
- __alignof__(struct type), AuCacheFlags, ctor)
-
-extern struct kmem_cache *au_cachep[];
-
-#define AuCacheFuncs(name, index) \
-static inline struct au_##name *au_cache_alloc_##name(void) \
-{ return kmem_cache_alloc(au_cachep[AuCache_##index], GFP_NOFS); } \
-static inline void au_cache_free_##name(struct au_##name *p) \
-{ kmem_cache_free(au_cachep[AuCache_##index], p); }
-
-AuCacheFuncs(dinfo, DINFO);
-AuCacheFuncs(icntnr, ICNTNR);
-AuCacheFuncs(finfo, FINFO);
-AuCacheFuncs(vdir, VDIR);
-AuCacheFuncs(vdir_dehstr, DEHSTR);
-#ifdef CONFIG_AUFS_HNOTIFY
-AuCacheFuncs(hnotify, HNOTIFY);
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_MODULE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * very ugly approach for aufs_mmap()
- * never include this file from other than f_op.c.
- * see f_op.c in detail.
- */
-
-#ifndef __AUFS_MTX_H__
-#define __AUFS_MTX_H__
-
-#ifdef __KERNEL__
-
-/* copied from ../kernel/mutex{,-debug}.h */
-struct mutex;
-struct thread_info;
-#ifdef CONFIG_DEBUG_MUTEXES
-static inline void mutex_set_owner(struct mutex *lock)
-{
- lock->owner = current_thread_info();
-}
-#else
-static inline void mutex_set_owner(struct mutex *lock)
-{
-#ifdef CONFIG_SMP
- lock->owner = current_thread_info();
-#endif
-}
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_MTX_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * mount options/flags
- */
-
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/types.h> /* a distribution requires */
-#include <linux/parser.h>
-#include "aufs.h"
-
-/* ---------------------------------------------------------------------- */
-
-enum {
- Opt_br,
- Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend,
- Opt_idel, Opt_imod, Opt_ireorder,
- Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, Opt_rendir,
- Opt_rdblk_def, Opt_rdhash_def,
- Opt_xino, Opt_zxino, Opt_noxino,
- Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
- Opt_trunc_xino_path, Opt_itrunc_xino,
- Opt_trunc_xib, Opt_notrunc_xib,
- Opt_shwh, Opt_noshwh,
- Opt_plink, Opt_noplink, Opt_list_plink,
- Opt_udba,
- Opt_dio, Opt_nodio,
- /* Opt_lock, Opt_unlock, */
- Opt_cmd, Opt_cmd_args,
- Opt_diropq_a, Opt_diropq_w,
- Opt_warn_perm, Opt_nowarn_perm,
- Opt_wbr_copyup, Opt_wbr_create,
- Opt_refrof, Opt_norefrof,
- Opt_verbose, Opt_noverbose,
- Opt_sum, Opt_nosum, Opt_wsum,
- Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
-};
-
-static match_table_t options = {
- {Opt_br, "br=%s"},
- {Opt_br, "br:%s"},
-
- {Opt_add, "add=%d:%s"},
- {Opt_add, "add:%d:%s"},
- {Opt_add, "ins=%d:%s"},
- {Opt_add, "ins:%d:%s"},
- {Opt_append, "append=%s"},
- {Opt_append, "append:%s"},
- {Opt_prepend, "prepend=%s"},
- {Opt_prepend, "prepend:%s"},
-
- {Opt_del, "del=%s"},
- {Opt_del, "del:%s"},
- /* {Opt_idel, "idel:%d"}, */
- {Opt_mod, "mod=%s"},
- {Opt_mod, "mod:%s"},
- /* {Opt_imod, "imod:%d:%s"}, */
-
- {Opt_dirwh, "dirwh=%d"},
-
- {Opt_xino, "xino=%s"},
- {Opt_noxino, "noxino"},
- {Opt_trunc_xino, "trunc_xino"},
- {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
- {Opt_notrunc_xino, "notrunc_xino"},
- {Opt_trunc_xino_path, "trunc_xino=%s"},
- {Opt_itrunc_xino, "itrunc_xino=%d"},
- /* {Opt_zxino, "zxino=%s"}, */
- {Opt_trunc_xib, "trunc_xib"},
- {Opt_notrunc_xib, "notrunc_xib"},
-
- {Opt_plink, "plink"},
- {Opt_noplink, "noplink"},
-#ifdef CONFIG_AUFS_DEBUG
- {Opt_list_plink, "list_plink"},
-#endif
-
- {Opt_udba, "udba=%s"},
-
- {Opt_dio, "dio"},
- {Opt_nodio, "nodio"},
-
- {Opt_diropq_a, "diropq=always"},
- {Opt_diropq_a, "diropq=a"},
- {Opt_diropq_w, "diropq=whiteouted"},
- {Opt_diropq_w, "diropq=w"},
-
- {Opt_warn_perm, "warn_perm"},
- {Opt_nowarn_perm, "nowarn_perm"},
-
- /* keep them temporary */
- {Opt_ignore_silent, "coo=%s"},
- {Opt_ignore_silent, "nodlgt"},
- {Opt_ignore_silent, "nodirperm1"},
- {Opt_ignore_silent, "clean_plink"},
-
-#ifdef CONFIG_AUFS_SHWH
- {Opt_shwh, "shwh"},
-#endif
- {Opt_noshwh, "noshwh"},
-
- {Opt_rendir, "rendir=%d"},
-
- {Opt_refrof, "refrof"},
- {Opt_norefrof, "norefrof"},
-
- {Opt_verbose, "verbose"},
- {Opt_verbose, "v"},
- {Opt_noverbose, "noverbose"},
- {Opt_noverbose, "quiet"},
- {Opt_noverbose, "q"},
- {Opt_noverbose, "silent"},
-
- {Opt_sum, "sum"},
- {Opt_nosum, "nosum"},
- {Opt_wsum, "wsum"},
-
- {Opt_rdcache, "rdcache=%d"},
- {Opt_rdblk, "rdblk=%d"},
- {Opt_rdblk_def, "rdblk=def"},
- {Opt_rdhash, "rdhash=%d"},
- {Opt_rdhash_def, "rdhash=def"},
-
- {Opt_wbr_create, "create=%s"},
- {Opt_wbr_create, "create_policy=%s"},
- {Opt_wbr_copyup, "cpup=%s"},
- {Opt_wbr_copyup, "copyup=%s"},
- {Opt_wbr_copyup, "copyup_policy=%s"},
-
- /* internal use for the scripts */
- {Opt_ignore_silent, "si=%s"},
-
- {Opt_br, "dirs=%s"},
- {Opt_ignore, "debug=%d"},
- {Opt_ignore, "delete=whiteout"},
- {Opt_ignore, "delete=all"},
- {Opt_ignore, "imap=%s"},
-
- /* temporary workaround, due to old mount(8)? */
- {Opt_ignore_silent, "relatime"},
-
- {Opt_err, NULL}
-};
-
-/* ---------------------------------------------------------------------- */
-
-static const char *au_parser_pattern(int val, struct match_token *token)
-{
- while (token->pattern) {
- if (token->token == val)
- return token->pattern;
- token++;
- }
- BUG();
- return "??";
-}
-
-/* ---------------------------------------------------------------------- */
-
-static match_table_t brperms = {
- {AuBrPerm_RO, AUFS_BRPERM_RO},
- {AuBrPerm_RR, AUFS_BRPERM_RR},
- {AuBrPerm_RW, AUFS_BRPERM_RW},
-
- {AuBrPerm_ROWH, AUFS_BRPERM_ROWH},
- {AuBrPerm_RRWH, AUFS_BRPERM_RRWH},
- {AuBrPerm_RWNoLinkWH, AUFS_BRPERM_RWNLWH},
-
- {AuBrPerm_ROWH, "nfsro"},
- {AuBrPerm_RO, NULL}
-};
-
-static int noinline_for_stack br_perm_val(char *perm)
-{
- int val;
- substring_t args[MAX_OPT_ARGS];
-
- val = match_token(perm, brperms, args);
- return val;
-}
-
-const char *au_optstr_br_perm(int brperm)
-{
- return au_parser_pattern(brperm, (void *)brperms);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static match_table_t udbalevel = {
- {AuOpt_UDBA_REVAL, "reval"},
- {AuOpt_UDBA_NONE, "none"},
-#ifdef CONFIG_AUFS_HNOTIFY
- {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */
-#ifdef CONFIG_AUFS_HFSNOTIFY
- {AuOpt_UDBA_HNOTIFY, "fsnotify"},
-#else
- {AuOpt_UDBA_HNOTIFY, "inotify"},
-#endif
-#endif
- {-1, NULL}
-};
-
-static void au_warn_inotify(int val, char *str)
-{
-#ifdef CONFIG_AUFS_HINOTIFY
- if (val == AuOpt_UDBA_HNOTIFY
- && !strcmp(str, "inotify"))
- AuWarn1("udba=inotify is deprecated, use udba=notify\n");
-#endif
-}
-
-static int noinline_for_stack udba_val(char *str)
-{
- int val;
- substring_t args[MAX_OPT_ARGS];
-
- val = match_token(str, udbalevel, args);
- au_warn_inotify(val, str);
- return val;
-}
-
-const char *au_optstr_udba(int udba)
-{
- return au_parser_pattern(udba, (void *)udbalevel);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static match_table_t au_wbr_create_policy = {
- {AuWbrCreate_TDP, "tdp"},
- {AuWbrCreate_TDP, "top-down-parent"},
- {AuWbrCreate_RR, "rr"},
- {AuWbrCreate_RR, "round-robin"},
- {AuWbrCreate_MFS, "mfs"},
- {AuWbrCreate_MFS, "most-free-space"},
- {AuWbrCreate_MFSV, "mfs:%d"},
- {AuWbrCreate_MFSV, "most-free-space:%d"},
-
- {AuWbrCreate_MFSRR, "mfsrr:%d"},
- {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
- {AuWbrCreate_PMFS, "pmfs"},
- {AuWbrCreate_PMFSV, "pmfs:%d"},
-
- {-1, NULL}
-};
-
-/*
- * cf. linux/lib/parser.c and cmdline.c
- * gave up calling memparse() since it uses simple_strtoull() instead of
- * strict_...().
- */
-static int noinline_for_stack
-au_match_ull(substring_t *s, unsigned long long *result)
-{
- int err;
- unsigned int len;
- char a[32];
-
- err = -ERANGE;
- len = s->to - s->from;
- if (len + 1 <= sizeof(a)) {
- memcpy(a, s->from, len);
- a[len] = '\0';
- err = strict_strtoull(a, 0, result);
- }
- return err;
-}
-
-static int au_wbr_mfs_wmark(substring_t *arg, char *str,
- struct au_opt_wbr_create *create)
-{
- int err;
- unsigned long long ull;
-
- err = 0;
- if (!au_match_ull(arg, &ull))
- create->mfsrr_watermark = ull;
- else {
- pr_err("bad integer in %s\n", str);
- err = -EINVAL;
- }
-
- return err;
-}
-
-static int au_wbr_mfs_sec(substring_t *arg, char *str,
- struct au_opt_wbr_create *create)
-{
- int n, err;
-
- err = 0;
- if (!match_int(arg, &n) && 0 <= n)
- create->mfs_second = n;
- else {
- pr_err("bad integer in %s\n", str);
- err = -EINVAL;
- }
-
- return err;
-}
-
-static int noinline_for_stack
-au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
-{
- int err, e;
- substring_t args[MAX_OPT_ARGS];
-
- err = match_token(str, au_wbr_create_policy, args);
- create->wbr_create = err;
- switch (err) {
- case AuWbrCreate_MFSRRV:
- e = au_wbr_mfs_wmark(&args[0], str, create);
- if (!e)
- e = au_wbr_mfs_sec(&args[1], str, create);
- if (unlikely(e))
- err = e;
- break;
- case AuWbrCreate_MFSRR:
- e = au_wbr_mfs_wmark(&args[0], str, create);
- if (unlikely(e)) {
- err = e;
- break;
- }
- /*FALLTHROUGH*/
- case AuWbrCreate_MFS:
- case AuWbrCreate_PMFS:
- create->mfs_second = AUFS_MFS_SECOND_DEF;
- break;
- case AuWbrCreate_MFSV:
- case AuWbrCreate_PMFSV:
- e = au_wbr_mfs_sec(&args[0], str, create);
- if (unlikely(e))
- err = e;
- break;
- }
-
- return err;
-}
-
-const char *au_optstr_wbr_create(int wbr_create)
-{
- return au_parser_pattern(wbr_create, (void *)au_wbr_create_policy);
-}
-
-static match_table_t au_wbr_copyup_policy = {
- {AuWbrCopyup_TDP, "tdp"},
- {AuWbrCopyup_TDP, "top-down-parent"},
- {AuWbrCopyup_BUP, "bup"},
- {AuWbrCopyup_BUP, "bottom-up-parent"},
- {AuWbrCopyup_BU, "bu"},
- {AuWbrCopyup_BU, "bottom-up"},
- {-1, NULL}
-};
-
-static int noinline_for_stack au_wbr_copyup_val(char *str)
-{
- substring_t args[MAX_OPT_ARGS];
-
- return match_token(str, au_wbr_copyup_policy, args);
-}
-
-const char *au_optstr_wbr_copyup(int wbr_copyup)
-{
- return au_parser_pattern(wbr_copyup, (void *)au_wbr_copyup_policy);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
-
-static void dump_opts(struct au_opts *opts)
-{
-#ifdef CONFIG_AUFS_DEBUG
- /* reduce stack space */
- union {
- struct au_opt_add *add;
- struct au_opt_del *del;
- struct au_opt_mod *mod;
- struct au_opt_xino *xino;
- struct au_opt_xino_itrunc *xino_itrunc;
- struct au_opt_wbr_create *create;
- } u;
- struct au_opt *opt;
-
- opt = opts->opt;
- while (opt->type != Opt_tail) {
- switch (opt->type) {
- case Opt_add:
- u.add = &opt->add;
- AuDbg("add {b%d, %s, 0x%x, %p}\n",
- u.add->bindex, u.add->pathname, u.add->perm,
- u.add->path.dentry);
- break;
- case Opt_del:
- case Opt_idel:
- u.del = &opt->del;
- AuDbg("del {%s, %p}\n",
- u.del->pathname, u.del->h_path.dentry);
- break;
- case Opt_mod:
- case Opt_imod:
- u.mod = &opt->mod;
- AuDbg("mod {%s, 0x%x, %p}\n",
- u.mod->path, u.mod->perm, u.mod->h_root);
- break;
- case Opt_append:
- u.add = &opt->add;
- AuDbg("append {b%d, %s, 0x%x, %p}\n",
- u.add->bindex, u.add->pathname, u.add->perm,
- u.add->path.dentry);
- break;
- case Opt_prepend:
- u.add = &opt->add;
- AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
- u.add->bindex, u.add->pathname, u.add->perm,
- u.add->path.dentry);
- break;
- case Opt_dirwh:
- AuDbg("dirwh %d\n", opt->dirwh);
- break;
- case Opt_rdcache:
- AuDbg("rdcache %d\n", opt->rdcache);
- break;
- case Opt_rdblk:
- AuDbg("rdblk %u\n", opt->rdblk);
- break;
- case Opt_rdblk_def:
- AuDbg("rdblk_def\n");
- break;
- case Opt_rdhash:
- AuDbg("rdhash %u\n", opt->rdhash);
- break;
- case Opt_rdhash_def:
- AuDbg("rdhash_def\n");
- break;
- case Opt_xino:
- u.xino = &opt->xino;
- AuDbg("xino {%s %.*s}\n",
- u.xino->path,
- AuDLNPair(u.xino->file->f_dentry));
- break;
- case Opt_trunc_xino:
- AuLabel(trunc_xino);
- break;
- case Opt_notrunc_xino:
- AuLabel(notrunc_xino);
- break;
- case Opt_trunc_xino_path:
- case Opt_itrunc_xino:
- u.xino_itrunc = &opt->xino_itrunc;
- AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
- break;
-
- case Opt_noxino:
- AuLabel(noxino);
- break;
- case Opt_trunc_xib:
- AuLabel(trunc_xib);
- break;
- case Opt_notrunc_xib:
- AuLabel(notrunc_xib);
- break;
- case Opt_shwh:
- AuLabel(shwh);
- break;
- case Opt_noshwh:
- AuLabel(noshwh);
- break;
- case Opt_plink:
- AuLabel(plink);
- break;
- case Opt_noplink:
- AuLabel(noplink);
- break;
- case Opt_list_plink:
- AuLabel(list_plink);
- break;
- case Opt_udba:
- AuDbg("udba %d, %s\n",
- opt->udba, au_optstr_udba(opt->udba));
- break;
- case Opt_dio:
- AuLabel(dio);
- break;
- case Opt_nodio:
- AuLabel(nodio);
- break;
- case Opt_diropq_a:
- AuLabel(diropq_a);
- break;
- case Opt_diropq_w:
- AuLabel(diropq_w);
- break;
- case Opt_warn_perm:
- AuLabel(warn_perm);
- break;
- case Opt_nowarn_perm:
- AuLabel(nowarn_perm);
- break;
- case Opt_refrof:
- AuLabel(refrof);
- break;
- case Opt_norefrof:
- AuLabel(norefrof);
- break;
- case Opt_verbose:
- AuLabel(verbose);
- break;
- case Opt_noverbose:
- AuLabel(noverbose);
- break;
- case Opt_sum:
- AuLabel(sum);
- break;
- case Opt_nosum:
- AuLabel(nosum);
- break;
- case Opt_wsum:
- AuLabel(wsum);
- break;
- case Opt_wbr_create:
- u.create = &opt->wbr_create;
- AuDbg("create %d, %s\n", u.create->wbr_create,
- au_optstr_wbr_create(u.create->wbr_create));
- switch (u.create->wbr_create) {
- case AuWbrCreate_MFSV:
- case AuWbrCreate_PMFSV:
- AuDbg("%d sec\n", u.create->mfs_second);
- break;
- case AuWbrCreate_MFSRR:
- AuDbg("%llu watermark\n",
- u.create->mfsrr_watermark);
- break;
- case AuWbrCreate_MFSRRV:
- AuDbg("%llu watermark, %d sec\n",
- u.create->mfsrr_watermark,
- u.create->mfs_second);
- break;
- }
- break;
- case Opt_wbr_copyup:
- AuDbg("copyup %d, %s\n", opt->wbr_copyup,
- au_optstr_wbr_copyup(opt->wbr_copyup));
- break;
- default:
- BUG();
- }
- opt++;
- }
-#endif
-}
-
-void au_opts_free(struct au_opts *opts)
-{
- struct au_opt *opt;
-
- opt = opts->opt;
- while (opt->type != Opt_tail) {
- switch (opt->type) {
- case Opt_add:
- case Opt_append:
- case Opt_prepend:
- path_put(&opt->add.path);
- break;
- case Opt_del:
- case Opt_idel:
- path_put(&opt->del.h_path);
- break;
- case Opt_mod:
- case Opt_imod:
- dput(opt->mod.h_root);
- break;
- case Opt_xino:
- fput(opt->xino.file);
- break;
- }
- opt++;
- }
-}
-
-static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
- aufs_bindex_t bindex)
-{
- int err;
- struct au_opt_add *add = &opt->add;
- char *p;
-
- add->bindex = bindex;
- add->perm = AuBrPerm_Last;
- add->pathname = opt_str;
- p = strchr(opt_str, '=');
- if (p) {
- *p++ = 0;
- if (*p)
- add->perm = br_perm_val(p);
- }
-
- err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
- if (!err) {
- if (!p) {
- add->perm = AuBrPerm_RO;
- if (au_test_fs_rr(add->path.dentry->d_sb))
- add->perm = AuBrPerm_RR;
- else if (!bindex && !(sb_flags & MS_RDONLY))
- add->perm = AuBrPerm_RW;
- }
- opt->type = Opt_add;
- goto out;
- }
- pr_err("lookup failed %s (%d)\n", add->pathname, err);
- err = -EINVAL;
-
- out:
- return err;
-}
-
-static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
-{
- int err;
-
- del->pathname = args[0].from;
- AuDbg("del path %s\n", del->pathname);
-
- err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
- if (unlikely(err))
- pr_err("lookup failed %s (%d)\n", del->pathname, err);
-
- return err;
-}
-
-#if 0 /* reserved for future use */
-static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
- struct au_opt_del *del, substring_t args[])
-{
- int err;
- struct dentry *root;
-
- err = -EINVAL;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_FLUSH);
- if (bindex < 0 || au_sbend(sb) < bindex) {
- pr_err("out of bounds, %d\n", bindex);
- goto out;
- }
-
- err = 0;
- del->h_path.dentry = dget(au_h_dptr(root, bindex));
- del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
-
- out:
- aufs_read_unlock(root, !AuLock_IR);
- return err;
-}
-#endif
-
-static int noinline_for_stack
-au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[])
-{
- int err;
- struct path path;
- char *p;
-
- err = -EINVAL;
- mod->path = args[0].from;
- p = strchr(mod->path, '=');
- if (unlikely(!p)) {
- pr_err("no permssion %s\n", args[0].from);
- goto out;
- }
-
- *p++ = 0;
- err = vfsub_kern_path(mod->path, lkup_dirflags, &path);
- if (unlikely(err)) {
- pr_err("lookup failed %s (%d)\n", mod->path, err);
- goto out;
- }
-
- mod->perm = br_perm_val(p);
- AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
- mod->h_root = dget(path.dentry);
- path_put(&path);
-
- out:
- return err;
-}
-
-#if 0 /* reserved for future use */
-static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
- struct au_opt_mod *mod, substring_t args[])
-{
- int err;
- struct dentry *root;
-
- err = -EINVAL;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_FLUSH);
- if (bindex < 0 || au_sbend(sb) < bindex) {
- pr_err("out of bounds, %d\n", bindex);
- goto out;
- }
-
- err = 0;
- mod->perm = br_perm_val(args[1].from);
- AuDbg("mod path %s, perm 0x%x, %s\n",
- mod->path, mod->perm, args[1].from);
- mod->h_root = dget(au_h_dptr(root, bindex));
-
- out:
- aufs_read_unlock(root, !AuLock_IR);
- return err;
-}
-#endif
-
-static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
- substring_t args[])
-{
- int err;
- struct file *file;
-
- file = au_xino_create(sb, args[0].from, /*silent*/0);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
-
- err = -EINVAL;
- if (unlikely(file->f_dentry->d_sb == sb)) {
- fput(file);
- pr_err("%s must be outside\n", args[0].from);
- goto out;
- }
-
- err = 0;
- xino->file = file;
- xino->path = args[0].from;
-
- out:
- return err;
-}
-
-static int noinline_for_stack
-au_opts_parse_xino_itrunc_path(struct super_block *sb,
- struct au_opt_xino_itrunc *xino_itrunc,
- substring_t args[])
-{
- int err;
- aufs_bindex_t bend, bindex;
- struct path path;
- struct dentry *root;
-
- err = vfsub_kern_path(args[0].from, lkup_dirflags, &path);
- if (unlikely(err)) {
- pr_err("lookup failed %s (%d)\n", args[0].from, err);
- goto out;
- }
-
- xino_itrunc->bindex = -1;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_FLUSH);
- bend = au_sbend(sb);
- for (bindex = 0; bindex <= bend; bindex++) {
- if (au_h_dptr(root, bindex) == path.dentry) {
- xino_itrunc->bindex = bindex;
- break;
- }
- }
- aufs_read_unlock(root, !AuLock_IR);
- path_put(&path);
-
- if (unlikely(xino_itrunc->bindex < 0)) {
- pr_err("no such branch %s\n", args[0].from);
- err = -EINVAL;
- }
-
- out:
- return err;
-}
-
-/* called without aufs lock */
-int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
-{
- int err, n, token;
- aufs_bindex_t bindex;
- unsigned char skipped;
- struct dentry *root;
- struct au_opt *opt, *opt_tail;
- char *opt_str;
- /* reduce the stack space */
- union {
- struct au_opt_xino_itrunc *xino_itrunc;
- struct au_opt_wbr_create *create;
- } u;
- struct {
- substring_t args[MAX_OPT_ARGS];
- } *a;
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- root = sb->s_root;
- err = 0;
- bindex = 0;
- opt = opts->opt;
- opt_tail = opt + opts->max_opt - 1;
- opt->type = Opt_tail;
- while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
- err = -EINVAL;
- skipped = 0;
- token = match_token(opt_str, options, a->args);
- switch (token) {
- case Opt_br:
- err = 0;
- while (!err && (opt_str = strsep(&a->args[0].from, ":"))
- && *opt_str) {
- err = opt_add(opt, opt_str, opts->sb_flags,
- bindex++);
- if (unlikely(!err && ++opt > opt_tail)) {
- err = -E2BIG;
- break;
- }
- opt->type = Opt_tail;
- skipped = 1;
- }
- break;
- case Opt_add:
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- bindex = n;
- err = opt_add(opt, a->args[1].from, opts->sb_flags,
- bindex);
- if (!err)
- opt->type = token;
- break;
- case Opt_append:
- err = opt_add(opt, a->args[0].from, opts->sb_flags,
- /*dummy bindex*/1);
- if (!err)
- opt->type = token;
- break;
- case Opt_prepend:
- err = opt_add(opt, a->args[0].from, opts->sb_flags,
- /*bindex*/0);
- if (!err)
- opt->type = token;
- break;
- case Opt_del:
- err = au_opts_parse_del(&opt->del, a->args);
- if (!err)
- opt->type = token;
- break;
-#if 0 /* reserved for future use */
- case Opt_idel:
- del->pathname = "(indexed)";
- if (unlikely(match_int(&args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- err = au_opts_parse_idel(sb, n, &opt->del, a->args);
- if (!err)
- opt->type = token;
- break;
-#endif
- case Opt_mod:
- err = au_opts_parse_mod(&opt->mod, a->args);
- if (!err)
- opt->type = token;
- break;
-#ifdef IMOD /* reserved for future use */
- case Opt_imod:
- u.mod->path = "(indexed)";
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
- if (!err)
- opt->type = token;
- break;
-#endif
- case Opt_xino:
- err = au_opts_parse_xino(sb, &opt->xino, a->args);
- if (!err)
- opt->type = token;
- break;
-
- case Opt_trunc_xino_path:
- err = au_opts_parse_xino_itrunc_path
- (sb, &opt->xino_itrunc, a->args);
- if (!err)
- opt->type = token;
- break;
-
- case Opt_itrunc_xino:
- u.xino_itrunc = &opt->xino_itrunc;
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- u.xino_itrunc->bindex = n;
- aufs_read_lock(root, AuLock_FLUSH);
- if (n < 0 || au_sbend(sb) < n) {
- pr_err("out of bounds, %d\n", n);
- aufs_read_unlock(root, !AuLock_IR);
- break;
- }
- aufs_read_unlock(root, !AuLock_IR);
- err = 0;
- opt->type = token;
- break;
-
- case Opt_dirwh:
- if (unlikely(match_int(&a->args[0], &opt->dirwh)))
- break;
- err = 0;
- opt->type = token;
- break;
-
- case Opt_rdcache:
- if (unlikely(match_int(&a->args[0], &opt->rdcache)))
- break;
- err = 0;
- opt->type = token;
- break;
- case Opt_rdblk:
- if (unlikely(match_int(&a->args[0], &n)
- || n < 0
- || n > KMALLOC_MAX_SIZE)) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- if (unlikely(n && n < NAME_MAX)) {
- pr_err("rdblk must be larger than %d\n",
- NAME_MAX);
- break;
- }
- opt->rdblk = n;
- err = 0;
- opt->type = token;
- break;
- case Opt_rdhash:
- if (unlikely(match_int(&a->args[0], &n)
- || n < 0
- || n * sizeof(struct hlist_head)
- > KMALLOC_MAX_SIZE)) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- opt->rdhash = n;
- err = 0;
- opt->type = token;
- break;
-
- case Opt_trunc_xino:
- case Opt_notrunc_xino:
- case Opt_noxino:
- case Opt_trunc_xib:
- case Opt_notrunc_xib:
- case Opt_shwh:
- case Opt_noshwh:
- case Opt_plink:
- case Opt_noplink:
- case Opt_list_plink:
- case Opt_dio:
- case Opt_nodio:
- case Opt_diropq_a:
- case Opt_diropq_w:
- case Opt_warn_perm:
- case Opt_nowarn_perm:
- case Opt_refrof:
- case Opt_norefrof:
- case Opt_verbose:
- case Opt_noverbose:
- case Opt_sum:
- case Opt_nosum:
- case Opt_wsum:
- case Opt_rdblk_def:
- case Opt_rdhash_def:
- err = 0;
- opt->type = token;
- break;
-
- case Opt_udba:
- opt->udba = udba_val(a->args[0].from);
- if (opt->udba >= 0) {
- err = 0;
- opt->type = token;
- } else
- pr_err("wrong value, %s\n", opt_str);
- break;
-
- case Opt_wbr_create:
- u.create = &opt->wbr_create;
- u.create->wbr_create
- = au_wbr_create_val(a->args[0].from, u.create);
- if (u.create->wbr_create >= 0) {
- err = 0;
- opt->type = token;
- } else
- pr_err("wrong value, %s\n", opt_str);
- break;
- case Opt_wbr_copyup:
- opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
- if (opt->wbr_copyup >= 0) {
- err = 0;
- opt->type = token;
- } else
- pr_err("wrong value, %s\n", opt_str);
- break;
-
- case Opt_ignore:
- pr_warning("ignored %s\n", opt_str);
- /*FALLTHROUGH*/
- case Opt_ignore_silent:
- skipped = 1;
- err = 0;
- break;
- case Opt_err:
- pr_err("unknown option %s\n", opt_str);
- break;
- }
-
- if (!err && !skipped) {
- if (unlikely(++opt > opt_tail)) {
- err = -E2BIG;
- opt--;
- opt->type = Opt_tail;
- break;
- }
- opt->type = Opt_tail;
- }
- }
-
- kfree(a);
- dump_opts(opts);
- if (unlikely(err))
- au_opts_free(opts);
-
- out:
- return err;
-}
-
-static int au_opt_wbr_create(struct super_block *sb,
- struct au_opt_wbr_create *create)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 1; /* handled */
- sbinfo = au_sbi(sb);
- if (sbinfo->si_wbr_create_ops->fin) {
- err = sbinfo->si_wbr_create_ops->fin(sb);
- if (!err)
- err = 1;
- }
-
- sbinfo->si_wbr_create = create->wbr_create;
- sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create;
- switch (create->wbr_create) {
- case AuWbrCreate_MFSRRV:
- case AuWbrCreate_MFSRR:
- sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark;
- /*FALLTHROUGH*/
- case AuWbrCreate_MFS:
- case AuWbrCreate_MFSV:
- case AuWbrCreate_PMFS:
- case AuWbrCreate_PMFSV:
- sbinfo->si_wbr_mfs.mfs_expire = create->mfs_second * HZ;
- break;
- }
-
- if (sbinfo->si_wbr_create_ops->init)
- sbinfo->si_wbr_create_ops->init(sb); /* ignore */
-
- return err;
-}
-
-/*
- * returns,
- * plus: processed without an error
- * zero: unprocessed
- */
-static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
- struct au_opts *opts)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 1; /* handled */
- sbinfo = au_sbi(sb);
- switch (opt->type) {
- case Opt_udba:
- sbinfo->si_mntflags &= ~AuOptMask_UDBA;
- sbinfo->si_mntflags |= opt->udba;
- opts->given_udba |= opt->udba;
- break;
-
- case Opt_plink:
- au_opt_set(sbinfo->si_mntflags, PLINK);
- break;
- case Opt_noplink:
- if (au_opt_test(sbinfo->si_mntflags, PLINK))
- au_plink_put(sb);
- au_opt_clr(sbinfo->si_mntflags, PLINK);
- break;
- case Opt_list_plink:
- if (au_opt_test(sbinfo->si_mntflags, PLINK))
- au_plink_list(sb);
- break;
-
- case Opt_dio:
- au_opt_set(sbinfo->si_mntflags, DIO);
- au_fset_opts(opts->flags, REFRESH_DYAOP);
- break;
- case Opt_nodio:
- au_opt_clr(sbinfo->si_mntflags, DIO);
- au_fset_opts(opts->flags, REFRESH_DYAOP);
- break;
-
- case Opt_diropq_a:
- au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
- break;
- case Opt_diropq_w:
- au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
- break;
-
- case Opt_warn_perm:
- au_opt_set(sbinfo->si_mntflags, WARN_PERM);
- break;
- case Opt_nowarn_perm:
- au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
- break;
-
- case Opt_refrof:
- au_opt_set(sbinfo->si_mntflags, REFROF);
- break;
- case Opt_norefrof:
- au_opt_clr(sbinfo->si_mntflags, REFROF);
- break;
-
- case Opt_verbose:
- au_opt_set(sbinfo->si_mntflags, VERBOSE);
- break;
- case Opt_noverbose:
- au_opt_clr(sbinfo->si_mntflags, VERBOSE);
- break;
-
- case Opt_sum:
- au_opt_set(sbinfo->si_mntflags, SUM);
- break;
- case Opt_wsum:
- au_opt_clr(sbinfo->si_mntflags, SUM);
- au_opt_set(sbinfo->si_mntflags, SUM_W);
- case Opt_nosum:
- au_opt_clr(sbinfo->si_mntflags, SUM);
- au_opt_clr(sbinfo->si_mntflags, SUM_W);
- break;
-
- case Opt_wbr_create:
- err = au_opt_wbr_create(sb, &opt->wbr_create);
- break;
- case Opt_wbr_copyup:
- sbinfo->si_wbr_copyup = opt->wbr_copyup;
- sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
- break;
-
- case Opt_dirwh:
- sbinfo->si_dirwh = opt->dirwh;
- break;
-
- case Opt_rdcache:
- sbinfo->si_rdcache = opt->rdcache * HZ;
- break;
- case Opt_rdblk:
- sbinfo->si_rdblk = opt->rdblk;
- break;
- case Opt_rdblk_def:
- sbinfo->si_rdblk = AUFS_RDBLK_DEF;
- break;
- case Opt_rdhash:
- sbinfo->si_rdhash = opt->rdhash;
- break;
- case Opt_rdhash_def:
- sbinfo->si_rdhash = AUFS_RDHASH_DEF;
- break;
-
- case Opt_shwh:
- au_opt_set(sbinfo->si_mntflags, SHWH);
- break;
- case Opt_noshwh:
- au_opt_clr(sbinfo->si_mntflags, SHWH);
- break;
-
- case Opt_trunc_xino:
- au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
- break;
- case Opt_notrunc_xino:
- au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
- break;
-
- case Opt_trunc_xino_path:
- case Opt_itrunc_xino:
- err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
- if (!err)
- err = 1;
- break;
-
- case Opt_trunc_xib:
- au_fset_opts(opts->flags, TRUNC_XIB);
- break;
- case Opt_notrunc_xib:
- au_fclr_opts(opts->flags, TRUNC_XIB);
- break;
-
- default:
- err = 0;
- break;
- }
-
- return err;
-}
-
-/*
- * returns tri-state.
- * plus: processed without an error
- * zero: unprocessed
- * minus: error
- */
-static int au_opt_br(struct super_block *sb, struct au_opt *opt,
- struct au_opts *opts)
-{
- int err, do_refresh;
-
- err = 0;
- switch (opt->type) {
- case Opt_append:
- opt->add.bindex = au_sbend(sb) + 1;
- if (opt->add.bindex < 0)
- opt->add.bindex = 0;
- goto add;
- case Opt_prepend:
- opt->add.bindex = 0;
- add:
- case Opt_add:
- err = au_br_add(sb, &opt->add,
- au_ftest_opts(opts->flags, REMOUNT));
- if (!err) {
- err = 1;
- au_fset_opts(opts->flags, REFRESH_DIR);
- au_fset_opts(opts->flags, REFRESH_NONDIR);
- }
- break;
-
- case Opt_del:
- case Opt_idel:
- err = au_br_del(sb, &opt->del,
- au_ftest_opts(opts->flags, REMOUNT));
- if (!err) {
- err = 1;
- au_fset_opts(opts->flags, TRUNC_XIB);
- au_fset_opts(opts->flags, REFRESH_DIR);
- au_fset_opts(opts->flags, REFRESH_NONDIR);
- }
- break;
-
- case Opt_mod:
- case Opt_imod:
- err = au_br_mod(sb, &opt->mod,
- au_ftest_opts(opts->flags, REMOUNT),
- &do_refresh);
- if (!err) {
- err = 1;
- if (do_refresh) {
- au_fset_opts(opts->flags, REFRESH_DIR);
- au_fset_opts(opts->flags, REFRESH_NONDIR);
- }
- }
- break;
- }
-
- return err;
-}
-
-static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
- struct au_opt_xino **opt_xino,
- struct au_opts *opts)
-{
- int err;
- aufs_bindex_t bend, bindex;
- struct dentry *root, *parent, *h_root;
-
- err = 0;
- switch (opt->type) {
- case Opt_xino:
- err = au_xino_set(sb, &opt->xino,
- !!au_ftest_opts(opts->flags, REMOUNT));
- if (unlikely(err))
- break;
-
- *opt_xino = &opt->xino;
- au_xino_brid_set(sb, -1);
-
- /* safe d_parent access */
- parent = opt->xino.file->f_dentry->d_parent;
- root = sb->s_root;
- bend = au_sbend(sb);
- for (bindex = 0; bindex <= bend; bindex++) {
- h_root = au_h_dptr(root, bindex);
- if (h_root == parent) {
- au_xino_brid_set(sb, au_sbr_id(sb, bindex));
- break;
- }
- }
- break;
-
- case Opt_noxino:
- au_xino_clr(sb);
- au_xino_brid_set(sb, -1);
- *opt_xino = (void *)-1;
- break;
- }
-
- return err;
-}
-
-int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
- unsigned int pending)
-{
- int err;
- aufs_bindex_t bindex, bend;
- unsigned char do_plink, skip, do_free;
- struct au_branch *br;
- struct au_wbr *wbr;
- struct dentry *root;
- struct inode *dir, *h_dir;
- struct au_sbinfo *sbinfo;
- struct au_hinode *hdir;
-
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA));
-
- if (!(sb_flags & MS_RDONLY)) {
- if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
- pr_warning("first branch should be rw\n");
- if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH)))
- pr_warning("shwh should be used with ro\n");
- }
-
- if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY)
- && !au_opt_test(sbinfo->si_mntflags, XINO))
- pr_warning("udba=*notify requires xino\n");
-
- err = 0;
- root = sb->s_root;
- dir = root->d_inode;
- do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK);
- bend = au_sbend(sb);
- for (bindex = 0; !err && bindex <= bend; bindex++) {
- skip = 0;
- h_dir = au_h_iptr(dir, bindex);
- br = au_sbr(sb, bindex);
- do_free = 0;
-
- wbr = br->br_wbr;
- if (wbr)
- wbr_wh_read_lock(wbr);
-
- switch (br->br_perm) {
- case AuBrPerm_RO:
- case AuBrPerm_ROWH:
- case AuBrPerm_RR:
- case AuBrPerm_RRWH:
- do_free = !!wbr;
- skip = (!wbr
- || (!wbr->wbr_whbase
- && !wbr->wbr_plink
- && !wbr->wbr_orph));
- break;
-
- case AuBrPerm_RWNoLinkWH:
- /* skip = (!br->br_whbase && !br->br_orph); */
- skip = (!wbr || !wbr->wbr_whbase);
- if (skip && wbr) {
- if (do_plink)
- skip = !!wbr->wbr_plink;
- else
- skip = !wbr->wbr_plink;
- }
- break;
-
- case AuBrPerm_RW:
- /* skip = (br->br_whbase && br->br_ohph); */
- skip = (wbr && wbr->wbr_whbase);
- if (skip) {
- if (do_plink)
- skip = !!wbr->wbr_plink;
- else
- skip = !wbr->wbr_plink;
- }
- break;
-
- default:
- BUG();
- }
- if (wbr)
- wbr_wh_read_unlock(wbr);
-
- if (skip)
- continue;
-
- hdir = au_hi(dir, bindex);
- au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
- if (wbr)
- wbr_wh_write_lock(wbr);
- err = au_wh_init(au_h_dptr(root, bindex), br, sb);
- if (wbr)
- wbr_wh_write_unlock(wbr);
- au_hn_imtx_unlock(hdir);
-
- if (!err && do_free) {
- kfree(wbr);
- br->br_wbr = NULL;
- }
- }
-
- return err;
-}
-
-int au_opts_mount(struct super_block *sb, struct au_opts *opts)
-{
- int err;
- unsigned int tmp;
- aufs_bindex_t bend;
- struct au_opt *opt;
- struct au_opt_xino *opt_xino, xino;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 0;
- opt_xino = NULL;
- opt = opts->opt;
- while (err >= 0 && opt->type != Opt_tail)
- err = au_opt_simple(sb, opt++, opts);
- if (err > 0)
- err = 0;
- else if (unlikely(err < 0))
- goto out;
-
- /* disable xino and udba temporary */
- sbinfo = au_sbi(sb);
- tmp = sbinfo->si_mntflags;
- au_opt_clr(sbinfo->si_mntflags, XINO);
- au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
-
- opt = opts->opt;
- while (err >= 0 && opt->type != Opt_tail)
- err = au_opt_br(sb, opt++, opts);
- if (err > 0)
- err = 0;
- else if (unlikely(err < 0))
- goto out;
-
- bend = au_sbend(sb);
- if (unlikely(bend < 0)) {
- err = -EINVAL;
- pr_err("no branches\n");
- goto out;
- }
-
- if (au_opt_test(tmp, XINO))
- au_opt_set(sbinfo->si_mntflags, XINO);
- opt = opts->opt;
- while (!err && opt->type != Opt_tail)
- err = au_opt_xino(sb, opt++, &opt_xino, opts);
- if (unlikely(err))
- goto out;
-
- err = au_opts_verify(sb, sb->s_flags, tmp);
- if (unlikely(err))
- goto out;
-
- /* restore xino */
- if (au_opt_test(tmp, XINO) && !opt_xino) {
- xino.file = au_xino_def(sb);
- err = PTR_ERR(xino.file);
- if (IS_ERR(xino.file))
- goto out;
-
- err = au_xino_set(sb, &xino, /*remount*/0);
- fput(xino.file);
- if (unlikely(err))
- goto out;
- }
-
- /* restore udba */
- sbinfo->si_mntflags &= ~AuOptMask_UDBA;
- sbinfo->si_mntflags |= (tmp & AuOptMask_UDBA);
- if (au_opt_test(tmp, UDBA_HNOTIFY)) {
- struct inode *dir = sb->s_root->d_inode;
- au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO);
- }
-
- out:
- return err;
-}
-
-int au_opts_remount(struct super_block *sb, struct au_opts *opts)
-{
- int err, rerr;
- struct inode *dir;
- struct au_opt_xino *opt_xino;
- struct au_opt *opt;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- dir = sb->s_root->d_inode;
- sbinfo = au_sbi(sb);
- err = 0;
- opt_xino = NULL;
- opt = opts->opt;
- while (err >= 0 && opt->type != Opt_tail) {
- err = au_opt_simple(sb, opt, opts);
- if (!err)
- err = au_opt_br(sb, opt, opts);
- if (!err)
- err = au_opt_xino(sb, opt, &opt_xino, opts);
- opt++;
- }
- if (err > 0)
- err = 0;
- AuTraceErr(err);
- /* go on even err */
-
- rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0);
- if (unlikely(rerr && !err))
- err = rerr;
-
- if (au_ftest_opts(opts->flags, TRUNC_XIB)) {
- rerr = au_xib_trunc(sb);
- if (unlikely(rerr && !err))
- err = rerr;
- }
-
- /* will be handled by the caller */
- if (!au_ftest_opts(opts->flags, REFRESH_DIR)
- && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO)))
- au_fset_opts(opts->flags, REFRESH_DIR);
-
- AuDbg("status 0x%x\n", opts->flags);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-unsigned int au_opt_udba(struct super_block *sb)
-{
- return au_mntflags(sb) & AuOptMask_UDBA;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * mount options/flags
- */
-
-#ifndef __AUFS_OPTS_H__
-#define __AUFS_OPTS_H__
-
-#ifdef __KERNEL__
-
-#include <linux/path.h>
-#include <linux/aufs_type.h>
-
-struct file;
-struct super_block;
-
-/* ---------------------------------------------------------------------- */
-
-/* mount flags */
-#define AuOpt_XINO 1 /* external inode number bitmap
- and translation table */
-#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */
-#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */
-#define AuOpt_UDBA_REVAL (1 << 3)
-#define AuOpt_UDBA_HNOTIFY (1 << 4)
-#define AuOpt_SHWH (1 << 5) /* show whiteout */
-#define AuOpt_PLINK (1 << 6) /* pseudo-link */
-#define AuOpt_DIRPERM1 (1 << 7) /* unimplemented */
-#define AuOpt_REFROF (1 << 8) /* unimplemented */
-#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */
-#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */
-#define AuOpt_SUM_W (1 << 11) /* unimplemented */
-#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */
-#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */
-#define AuOpt_DIO (1 << 14) /* direct io */
-
-#ifndef CONFIG_AUFS_HNOTIFY
-#undef AuOpt_UDBA_HNOTIFY
-#define AuOpt_UDBA_HNOTIFY 0
-#endif
-#ifndef CONFIG_AUFS_SHWH
-#undef AuOpt_SHWH
-#define AuOpt_SHWH 0
-#endif
-
-#define AuOpt_Def (AuOpt_XINO \
- | AuOpt_UDBA_REVAL \
- | AuOpt_PLINK \
- /* | AuOpt_DIRPERM1 */ \
- | AuOpt_WARN_PERM)
-#define AuOptMask_UDBA (AuOpt_UDBA_NONE \
- | AuOpt_UDBA_REVAL \
- | AuOpt_UDBA_HNOTIFY)
-
-#define au_opt_test(flags, name) (flags & AuOpt_##name)
-#define au_opt_set(flags, name) do { \
- BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
- ((flags) |= AuOpt_##name); \
-} while (0)
-#define au_opt_set_udba(flags, name) do { \
- (flags) &= ~AuOptMask_UDBA; \
- ((flags) |= AuOpt_##name); \
-} while (0)
-#define au_opt_clr(flags, name) { ((flags) &= ~AuOpt_##name); }
-
-/* ---------------------------------------------------------------------- */
-
-/* policies to select one among multiple writable branches */
-enum {
- AuWbrCreate_TDP, /* top down parent */
- AuWbrCreate_RR, /* round robin */
- AuWbrCreate_MFS, /* most free space */
- AuWbrCreate_MFSV, /* mfs with seconds */
- AuWbrCreate_MFSRR, /* mfs then rr */
- AuWbrCreate_MFSRRV, /* mfs then rr with seconds */
- AuWbrCreate_PMFS, /* parent and mfs */
- AuWbrCreate_PMFSV, /* parent and mfs with seconds */
-
- AuWbrCreate_Def = AuWbrCreate_TDP
-};
-
-enum {
- AuWbrCopyup_TDP, /* top down parent */
- AuWbrCopyup_BUP, /* bottom up parent */
- AuWbrCopyup_BU, /* bottom up */
-
- AuWbrCopyup_Def = AuWbrCopyup_TDP
-};
-
-/* ---------------------------------------------------------------------- */
-
-struct au_opt_add {
- aufs_bindex_t bindex;
- char *pathname;
- int perm;
- struct path path;
-};
-
-struct au_opt_del {
- char *pathname;
- struct path h_path;
-};
-
-struct au_opt_mod {
- char *path;
- int perm;
- struct dentry *h_root;
-};
-
-struct au_opt_xino {
- char *path;
- struct file *file;
-};
-
-struct au_opt_xino_itrunc {
- aufs_bindex_t bindex;
-};
-
-struct au_opt_wbr_create {
- int wbr_create;
- int mfs_second;
- unsigned long long mfsrr_watermark;
-};
-
-struct au_opt {
- int type;
- union {
- struct au_opt_xino xino;
- struct au_opt_xino_itrunc xino_itrunc;
- struct au_opt_add add;
- struct au_opt_del del;
- struct au_opt_mod mod;
- int dirwh;
- int rdcache;
- unsigned int rdblk;
- unsigned int rdhash;
- int udba;
- struct au_opt_wbr_create wbr_create;
- int wbr_copyup;
- };
-};
-
-/* opts flags */
-#define AuOpts_REMOUNT 1
-#define AuOpts_REFRESH_DIR (1 << 1)
-#define AuOpts_REFRESH_NONDIR (1 << 2)
-#define AuOpts_TRUNC_XIB (1 << 3)
-#define AuOpts_REFRESH_DYAOP (1 << 4)
-#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name)
-#define au_fset_opts(flags, name) { (flags) |= AuOpts_##name; }
-#define au_fclr_opts(flags, name) { (flags) &= ~AuOpts_##name; }
-
-struct au_opts {
- struct au_opt *opt;
- int max_opt;
-
- unsigned int given_udba;
- unsigned int flags;
- unsigned long sb_flags;
-};
-
-/* ---------------------------------------------------------------------- */
-
-const char *au_optstr_br_perm(int brperm);
-const char *au_optstr_udba(int udba);
-const char *au_optstr_wbr_copyup(int wbr_copyup);
-const char *au_optstr_wbr_create(int wbr_create);
-
-void au_opts_free(struct au_opts *opts);
-int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
-int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
- unsigned int pending);
-int au_opts_mount(struct super_block *sb, struct au_opts *opts);
-int au_opts_remount(struct super_block *sb, struct au_opts *opts);
-
-unsigned int au_opt_udba(struct super_block *sb);
-
-/* ---------------------------------------------------------------------- */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_OPTS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * pseudo-link
- */
-
-#include "aufs.h"
-
-/*
- * during a user process maintains the pseudo-links,
- * prohibit adding a new plink and branch manipulation.
- */
-void au_plink_maint_block(struct super_block *sb)
-{
- struct au_sbinfo *sbi = au_sbi(sb);
-
- SiMustAnyLock(sb);
-
- /* gave up wake_up_bit() */
- wait_event(sbi->si_plink_wq, !sbi->si_plink_maint);
-}
-
-void au_plink_maint_leave(struct file *file)
-{
- struct au_sbinfo *sbinfo;
- int iam;
-
- AuDebugOn(atomic_long_read(&file->f_count));
-
- sbinfo = au_sbi(file->f_dentry->d_sb);
- spin_lock(&sbinfo->si_plink_maint_lock);
- iam = (sbinfo->si_plink_maint == file);
- if (iam)
- sbinfo->si_plink_maint = NULL;
- spin_unlock(&sbinfo->si_plink_maint_lock);
- if (iam)
- wake_up_all(&sbinfo->si_plink_wq);
-}
-
-static int au_plink_maint_enter(struct file *file)
-{
- int err;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
- err = 0;
- sb = file->f_dentry->d_sb;
- sbinfo = au_sbi(sb);
- /* make sure i am the only one in this fs */
- si_write_lock(sb);
- /* spin_lock(&sbinfo->si_plink_maint_lock); */
- if (!sbinfo->si_plink_maint)
- sbinfo->si_plink_maint = file;
- else
- err = -EBUSY;
- /* spin_unlock(&sbinfo->si_plink_maint_lock); */
- si_write_unlock(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct pseudo_link {
- union {
- struct list_head list;
- struct rcu_head rcu;
- };
- struct inode *inode;
-};
-
-#ifdef CONFIG_AUFS_DEBUG
-void au_plink_list(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- struct list_head *plink_list;
- struct pseudo_link *plink;
-
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-
- plink_list = &sbinfo->si_plink.head;
- rcu_read_lock();
- list_for_each_entry_rcu(plink, plink_list, list)
- AuDbg("%lu\n", plink->inode->i_ino);
- rcu_read_unlock();
-}
-#endif
-
-/* is the inode pseudo-linked? */
-int au_plink_test(struct inode *inode)
-{
- int found;
- struct au_sbinfo *sbinfo;
- struct list_head *plink_list;
- struct pseudo_link *plink;
-
- sbinfo = au_sbi(inode->i_sb);
- AuRwMustAnyLock(&sbinfo->si_rwsem);
- AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK));
-
- found = 0;
- plink_list = &sbinfo->si_plink.head;
- rcu_read_lock();
- list_for_each_entry_rcu(plink, plink_list, list)
- if (plink->inode == inode) {
- found = 1;
- break;
- }
- rcu_read_unlock();
- return found;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * generate a name for plink.
- * the file will be stored under AUFS_WH_PLINKDIR.
- */
-/* 20 is max digits length of ulong 64 */
-#define PLINK_NAME_LEN ((20 + 1) * 2)
-
-static int plink_name(char *name, int len, struct inode *inode,
- aufs_bindex_t bindex)
-{
- int rlen;
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, bindex);
- rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino);
- return rlen;
-}
-
-/* lookup the plink-ed @inode under the branch at @bindex */
-struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex)
-{
- struct dentry *h_dentry, *h_parent;
- struct au_branch *br;
- struct inode *h_dir;
- char a[PLINK_NAME_LEN];
- struct qstr tgtname = {
- .name = a
- };
-
- br = au_sbr(inode->i_sb, bindex);
- h_parent = br->br_wbr->wbr_plink;
- h_dir = h_parent->d_inode;
- tgtname.len = plink_name(a, sizeof(a), inode, bindex);
-
- /* always superio. */
- mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2);
- h_dentry = au_sio_lkup_one(&tgtname, h_parent, br);
- mutex_unlock(&h_dir->i_mutex);
- return h_dentry;
-}
-
-/* create a pseudo-link */
-static int do_whplink(struct qstr *tgt, struct dentry *h_parent,
- struct dentry *h_dentry, struct au_branch *br)
-{
- int err;
- struct path h_path = {
- .mnt = br->br_mnt
- };
- struct inode *h_dir;
-
- h_dir = h_parent->d_inode;
- again:
- h_path.dentry = au_lkup_one(tgt, h_parent, br, /*nd*/NULL);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry))
- goto out;
-
- err = 0;
- /* wh.plink dir is not monitored */
- if (h_path.dentry->d_inode
- && h_path.dentry->d_inode != h_dentry->d_inode) {
- err = vfsub_unlink(h_dir, &h_path, /*force*/0);
- dput(h_path.dentry);
- h_path.dentry = NULL;
- if (!err)
- goto again;
- }
- if (!err && !h_path.dentry->d_inode)
- err = vfsub_link(h_dentry, h_dir, &h_path);
- dput(h_path.dentry);
-
- out:
- return err;
-}
-
-struct do_whplink_args {
- int *errp;
- struct qstr *tgt;
- struct dentry *h_parent;
- struct dentry *h_dentry;
- struct au_branch *br;
-};
-
-static void call_do_whplink(void *args)
-{
- struct do_whplink_args *a = args;
- *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br);
-}
-
-static int whplink(struct dentry *h_dentry, struct inode *inode,
- aufs_bindex_t bindex, struct au_branch *br)
-{
- int err, wkq_err;
- struct au_wbr *wbr;
- struct dentry *h_parent;
- struct inode *h_dir;
- char a[PLINK_NAME_LEN];
- struct qstr tgtname = {
- .name = a
- };
-
- wbr = au_sbr(inode->i_sb, bindex)->br_wbr;
- h_parent = wbr->wbr_plink;
- h_dir = h_parent->d_inode;
- tgtname.len = plink_name(a, sizeof(a), inode, bindex);
-
- /* always superio. */
- mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2);
- if (!au_test_wkq(current)) {
- struct do_whplink_args args = {
- .errp = &err,
- .tgt = &tgtname,
- .h_parent = h_parent,
- .h_dentry = h_dentry,
- .br = br
- };
- wkq_err = au_wkq_wait(call_do_whplink, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- } else
- err = do_whplink(&tgtname, h_parent, h_dentry, br);
- mutex_unlock(&h_dir->i_mutex);
-
- return err;
-}
-
-/* free a single plink */
-static void do_put_plink(struct pseudo_link *plink, int do_del)
-{
- if (do_del)
- list_del(&plink->list);
- iput(plink->inode);
- kfree(plink);
-}
-
-static void do_put_plink_rcu(struct rcu_head *rcu)
-{
- struct pseudo_link *plink;
-
- plink = container_of(rcu, struct pseudo_link, rcu);
- iput(plink->inode);
- kfree(plink);
-}
-
-/*
- * create a new pseudo-link for @h_dentry on @bindex.
- * the linked inode is held in aufs @inode.
- */
-void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_dentry)
-{
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
- struct list_head *plink_list;
- struct pseudo_link *plink, *tmp;
- int found, err, cnt;
-
- sb = inode->i_sb;
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-
- cnt = 0;
- found = 0;
- plink_list = &sbinfo->si_plink.head;
- rcu_read_lock();
- list_for_each_entry_rcu(plink, plink_list, list) {
- cnt++;
- if (plink->inode == inode) {
- found = 1;
- break;
- }
- }
- rcu_read_unlock();
- if (found)
- return;
-
- tmp = kmalloc(sizeof(*plink), GFP_NOFS);
- if (tmp)
- tmp->inode = au_igrab(inode);
- else {
- err = -ENOMEM;
- goto out;
- }
-
- spin_lock(&sbinfo->si_plink.spin);
- list_for_each_entry(plink, plink_list, list) {
- if (plink->inode == inode) {
- found = 1;
- break;
- }
- }
- if (!found)
- list_add_rcu(&tmp->list, plink_list);
- spin_unlock(&sbinfo->si_plink.spin);
- if (!found) {
- cnt++;
- WARN_ONCE(cnt > AUFS_PLINK_WARN,
- "unexpectedly many pseudo links, %d\n", cnt);
- au_plink_maint_block(sb);
- err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex));
- } else {
- do_put_plink(tmp, 0);
- return;
- }
-
-out:
- if (unlikely(err)) {
- pr_warning("err %d, damaged pseudo link.\n", err);
- if (tmp) {
- au_spl_del_rcu(&tmp->list, &sbinfo->si_plink);
- call_rcu(&tmp->rcu, do_put_plink_rcu);
- }
- }
-}
-
-/* free all plinks */
-void au_plink_put(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- struct list_head *plink_list;
- struct pseudo_link *plink, *tmp;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-
- plink_list = &sbinfo->si_plink.head;
- /* no spin_lock since sbinfo is write-locked */
- list_for_each_entry_safe(plink, tmp, plink_list, list)
- do_put_plink(plink, 0);
- INIT_LIST_HEAD(plink_list);
-}
-
-/* free the plinks on a branch specified by @br_id */
-void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id)
-{
- struct au_sbinfo *sbinfo;
- struct list_head *plink_list;
- struct pseudo_link *plink, *tmp;
- struct inode *inode;
- aufs_bindex_t bstart, bend, bindex;
- unsigned char do_put;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-
- plink_list = &sbinfo->si_plink.head;
- /* no spin_lock since sbinfo is write-locked */
- list_for_each_entry_safe(plink, tmp, plink_list, list) {
- do_put = 0;
- inode = au_igrab(plink->inode);
- ii_write_lock_child(inode);
- bstart = au_ibstart(inode);
- bend = au_ibend(inode);
- if (bstart >= 0) {
- for (bindex = bstart; bindex <= bend; bindex++) {
- if (!au_h_iptr(inode, bindex)
- || au_ii_br_id(inode, bindex) != br_id)
- continue;
- au_set_h_iptr(inode, bindex, NULL, 0);
- do_put = 1;
- break;
- }
- } else
- do_put_plink(plink, 1);
-
- if (do_put) {
- for (bindex = bstart; bindex <= bend; bindex++)
- if (au_h_iptr(inode, bindex)) {
- do_put = 0;
- break;
- }
- if (do_put)
- do_put_plink(plink, 1);
- }
- ii_write_unlock(inode);
- iput(inode);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-long au_plink_ioctl(struct file *file, unsigned int cmd)
-{
- long err;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
- err = -EACCES;
- if (!capable(CAP_SYS_ADMIN))
- goto out;
-
- err = 0;
- sb = file->f_dentry->d_sb;
- sbinfo = au_sbi(sb);
- switch (cmd) {
- case AUFS_CTL_PLINK_MAINT:
- /*
- * pseudo-link maintenance mode,
- * cleared by aufs_release_dir()
- */
- err = au_plink_maint_enter(file);
- break;
- case AUFS_CTL_PLINK_CLEAN:
- aufs_write_lock(sb->s_root);
- if (au_opt_test(sbinfo->si_mntflags, PLINK))
- au_plink_put(sb);
- aufs_write_unlock(sb->s_root);
- break;
- default:
- /* err = -ENOTTY; */
- err = -EINVAL;
- }
- out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * poll operation
- * There is only one filesystem which implements ->poll operation, currently.
- */
-
-#include "aufs.h"
-
-unsigned int aufs_poll(struct file *file, poll_table *wait)
-{
- unsigned int mask;
- int err;
- struct file *h_file;
- struct dentry *dentry;
- struct super_block *sb;
-
- /* We should pretend an error happened. */
- mask = POLLERR /* | POLLIN | POLLOUT */;
- dentry = file->f_dentry;
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
- if (unlikely(err))
- goto out;
-
- /* it is not an error if h_file has no operation */
- mask = DEFAULT_POLLMASK;
- h_file = au_hf_top(file);
- if (h_file->f_op && h_file->f_op->poll)
- mask = h_file->f_op->poll(h_file, wait);
-
- di_read_unlock(dentry, AuLock_IR);
- fi_read_unlock(file);
-
- out:
- si_read_unlock(sb);
- AuTraceErr((int)mask);
- return mask;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * readdir in userspace.
- */
-
-#include <linux/fs_stack.h>
-#include <linux/security.h>
-#include <linux/uaccess.h>
-#include <linux/aufs_type.h>
-#include "aufs.h"
-
-/* bits for struct aufs_rdu.flags */
-#define AuRdu_CALLED 1
-#define AuRdu_CONT (1 << 1)
-#define AuRdu_FULL (1 << 2)
-#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name)
-#define au_fset_rdu(flags, name) { (flags) |= AuRdu_##name; }
-#define au_fclr_rdu(flags, name) { (flags) &= ~AuRdu_##name; }
-
-struct au_rdu_arg {
- struct aufs_rdu *rdu;
- union au_rdu_ent_ul ent;
- unsigned long end;
-
- struct super_block *sb;
- int err;
-};
-
-static int au_rdu_fill(void *__arg, const char *name, int nlen,
- loff_t offset, u64 h_ino, unsigned int d_type)
-{
- int err, len;
- struct au_rdu_arg *arg = __arg;
- struct aufs_rdu *rdu = arg->rdu;
- struct au_rdu_ent ent;
-
- err = 0;
- arg->err = 0;
- au_fset_rdu(rdu->cookie.flags, CALLED);
- len = au_rdu_len(nlen);
- if (arg->ent.ul + len < arg->end) {
- ent.ino = h_ino;
- ent.bindex = rdu->cookie.bindex;
- ent.type = d_type;
- ent.nlen = nlen;
- if (unlikely(nlen > AUFS_MAX_NAMELEN))
- ent.type = DT_UNKNOWN;
-
- err = -EFAULT;
- if (copy_to_user(arg->ent.e, &ent, sizeof(ent)))
- goto out;
- if (copy_to_user(arg->ent.e->name, name, nlen))
- goto out;
- /* the terminating NULL */
- if (__put_user(0, arg->ent.e->name + nlen))
- goto out;
- err = 0;
- /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */
- arg->ent.ul += len;
- rdu->rent++;
- } else {
- err = -EFAULT;
- au_fset_rdu(rdu->cookie.flags, FULL);
- rdu->full = 1;
- rdu->tail = arg->ent;
- }
-
- out:
- /* AuTraceErr(err); */
- return err;
-}
-
-static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg)
-{
- int err;
- loff_t offset;
- struct au_rdu_cookie *cookie = &arg->rdu->cookie;
-
- offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET);
- err = offset;
- if (unlikely(offset != cookie->h_pos))
- goto out;
-
- err = 0;
- do {
- arg->err = 0;
- au_fclr_rdu(cookie->flags, CALLED);
- /* smp_mb(); */
- err = vfsub_readdir(h_file, au_rdu_fill, arg);
- if (err >= 0)
- err = arg->err;
- } while (!err
- && au_ftest_rdu(cookie->flags, CALLED)
- && !au_ftest_rdu(cookie->flags, FULL));
- cookie->h_pos = h_file->f_pos;
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-static int au_rdu(struct file *file, struct aufs_rdu *rdu)
-{
- int err;
- aufs_bindex_t bend;
- struct au_rdu_arg arg;
- struct dentry *dentry;
- struct inode *inode;
- struct file *h_file;
- struct au_rdu_cookie *cookie = &rdu->cookie;
-
- err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out;
- }
- rdu->rent = 0;
- rdu->tail = rdu->ent;
- rdu->full = 0;
- arg.rdu = rdu;
- arg.ent = rdu->ent;
- arg.end = arg.ent.ul;
- arg.end += rdu->sz;
-
- err = -ENOTDIR;
- if (unlikely(!file->f_op || !file->f_op->readdir))
- goto out;
-
- err = security_file_permission(file, MAY_READ);
- AuTraceErr(err);
- if (unlikely(err))
- goto out;
-
- dentry = file->f_dentry;
- inode = dentry->d_inode;
-#if 1
- mutex_lock(&inode->i_mutex);
-#else
- err = mutex_lock_killable(&inode->i_mutex);
- AuTraceErr(err);
- if (unlikely(err))
- goto out;
-#endif
- err = -ENOENT;
- if (unlikely(IS_DEADDIR(inode)))
- goto out_mtx;
-
- arg.sb = inode->i_sb;
- si_read_lock(arg.sb, AuLock_FLUSH);
- fi_read_lock(file);
-
- err = -EAGAIN;
- if (unlikely(au_ftest_rdu(cookie->flags, CONT)
- && cookie->generation != au_figen(file)))
- goto out_unlock;
-
- err = 0;
- if (!rdu->blk) {
- rdu->blk = au_sbi(arg.sb)->si_rdblk;
- if (!rdu->blk)
- rdu->blk = au_dir_size(file, /*dentry*/NULL);
- }
- bend = au_fbstart(file);
- if (cookie->bindex < bend)
- cookie->bindex = bend;
- bend = au_fbend_dir(file);
- /* AuDbg("b%d, b%d\n", cookie->bindex, bend); */
- for (; !err && cookie->bindex <= bend;
- cookie->bindex++, cookie->h_pos = 0) {
- h_file = au_hf_dir(file, cookie->bindex);
- if (!h_file)
- continue;
-
- au_fclr_rdu(cookie->flags, FULL);
- err = au_rdu_do(h_file, &arg);
- AuTraceErr(err);
- if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
- break;
- }
- AuDbg("rent %llu\n", rdu->rent);
-
- if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
- rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
- au_fset_rdu(cookie->flags, CONT);
- cookie->generation = au_figen(file);
- }
-
- ii_read_lock_child(inode);
- fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode)));
- ii_read_unlock(inode);
-
- out_unlock:
- fi_read_unlock(file);
- si_read_unlock(arg.sb);
- out_mtx:
- mutex_unlock(&inode->i_mutex);
- out:
- AuTraceErr(err);
- return err;
-}
-
-static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu)
-{
- int err;
- ino_t ino;
- unsigned long long nent;
- union au_rdu_ent_ul *u;
- struct au_rdu_ent ent;
- struct super_block *sb;
-
- err = 0;
- nent = rdu->nent;
- u = &rdu->ent;
- sb = file->f_dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- while (nent-- > 0) {
- err = copy_from_user(&ent, u->e, sizeof(ent));
- if (!err)
- err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- break;
- }
-
- /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */
- if (!ent.wh)
- err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino);
- else
- err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type,
- &ino);
- if (unlikely(err)) {
- AuTraceErr(err);
- break;
- }
-
- err = __put_user(ino, &u->e->ino);
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- break;
- }
- u->ul += au_rdu_len(ent.nlen);
- }
- si_read_unlock(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_rdu_verify(struct aufs_rdu *rdu)
-{
- AuDbg("rdu{%llu, %p, (%u, %u) | %u | %llu, %u, %u | "
- "%llu, b%d, 0x%x, g%u}\n",
- rdu->sz, rdu->ent.e, rdu->verify[0], rdu->verify[1],
- rdu->blk,
- rdu->rent, rdu->shwh, rdu->full,
- rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags,
- rdu->cookie.generation);
-
- if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)
- && rdu->verify[AufsCtlRduV_SZ_PTR] == sizeof(rdu))
- return 0;
-
- AuDbg("%u:%u, %u:%u\n",
- rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu),
- rdu->verify[AufsCtlRduV_SZ_PTR], (unsigned int)sizeof(rdu));
- return -EINVAL;
-}
-
-long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err, e;
- struct aufs_rdu rdu;
- void __user *p = (void __user *)arg;
-
- err = copy_from_user(&rdu, p, sizeof(rdu));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out;
- }
- err = au_rdu_verify(&rdu);
- if (unlikely(err))
- goto out;
-
- switch (cmd) {
- case AUFS_CTL_RDU:
- err = au_rdu(file, &rdu);
- if (unlikely(err))
- break;
-
- e = copy_to_user(p, &rdu, sizeof(rdu));
- if (unlikely(e)) {
- err = -EFAULT;
- AuTraceErr(err);
- }
- break;
- case AUFS_CTL_RDU_INO:
- err = au_rdu_ino(file, &rdu);
- break;
-
- default:
- /* err = -ENOTTY; */
- err = -EINVAL;
- }
-
- out:
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * simple read-write semaphore wrappers
- */
-
-#ifndef __AUFS_RWSEM_H__
-#define __AUFS_RWSEM_H__
-
-#ifdef __KERNEL__
-
-#include <linux/rwsem.h>
-#include "debug.h"
-
-struct au_rwsem {
- struct rw_semaphore rwsem;
-#ifdef CONFIG_AUFS_DEBUG
- /* just for debugging, not almighty counter */
- atomic_t rcnt, wcnt;
-#endif
-};
-
-#ifdef CONFIG_AUFS_DEBUG
-#define AuDbgCntInit(rw) do { \
- atomic_set(&(rw)->rcnt, 0); \
- atomic_set(&(rw)->wcnt, 0); \
- smp_mb(); /* atomic set */ \
-} while (0)
-
-#define AuDbgRcntInc(rw) atomic_inc_return(&(rw)->rcnt)
-#define AuDbgRcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0)
-#define AuDbgWcntInc(rw) WARN_ON(atomic_inc_return(&(rw)->wcnt) > 1)
-#define AuDbgWcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0)
-#else
-#define AuDbgCntInit(rw) do {} while (0)
-#define AuDbgRcntInc(rw) do {} while (0)
-#define AuDbgRcntDec(rw) do {} while (0)
-#define AuDbgWcntInc(rw) do {} while (0)
-#define AuDbgWcntDec(rw) do {} while (0)
-#endif /* CONFIG_AUFS_DEBUG */
-
-/* to debug easier, do not make them inlined functions */
-#define AuRwMustNoWaiters(rw) AuDebugOn(!list_empty(&(rw)->rwsem.wait_list))
-/* rwsem_is_locked() is unusable */
-#define AuRwMustReadLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0)
-#define AuRwMustWriteLock(rw) AuDebugOn(atomic_read(&(rw)->wcnt) <= 0)
-#define AuRwMustAnyLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \
- && atomic_read(&(rw)->wcnt) <= 0)
-#define AuRwDestroy(rw) AuDebugOn(atomic_read(&(rw)->rcnt) \
- || atomic_read(&(rw)->wcnt))
-
-static inline void au_rw_init(struct au_rwsem *rw)
-{
- AuDbgCntInit(rw);
- init_rwsem(&rw->rwsem);
-}
-
-static inline void au_rw_init_wlock(struct au_rwsem *rw)
-{
- au_rw_init(rw);
- down_write(&rw->rwsem);
- AuDbgWcntInc(rw);
-}
-
-static inline void au_rw_init_wlock_nested(struct au_rwsem *rw,
- unsigned int lsc)
-{
- au_rw_init(rw);
- down_write_nested(&rw->rwsem, lsc);
- AuDbgWcntInc(rw);
-}
-
-static inline void au_rw_read_lock(struct au_rwsem *rw)
-{
- down_read(&rw->rwsem);
- AuDbgRcntInc(rw);
-}
-
-static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc)
-{
- down_read_nested(&rw->rwsem, lsc);
- AuDbgRcntInc(rw);
-}
-
-static inline void au_rw_read_unlock(struct au_rwsem *rw)
-{
- AuRwMustReadLock(rw);
- AuDbgRcntDec(rw);
- up_read(&rw->rwsem);
-}
-
-static inline void au_rw_dgrade_lock(struct au_rwsem *rw)
-{
- AuRwMustWriteLock(rw);
- AuDbgRcntInc(rw);
- AuDbgWcntDec(rw);
- downgrade_write(&rw->rwsem);
-}
-
-static inline void au_rw_write_lock(struct au_rwsem *rw)
-{
- down_write(&rw->rwsem);
- AuDbgWcntInc(rw);
-}
-
-static inline void au_rw_write_lock_nested(struct au_rwsem *rw,
- unsigned int lsc)
-{
- down_write_nested(&rw->rwsem, lsc);
- AuDbgWcntInc(rw);
-}
-
-static inline void au_rw_write_unlock(struct au_rwsem *rw)
-{
- AuRwMustWriteLock(rw);
- AuDbgWcntDec(rw);
- up_write(&rw->rwsem);
-}
-
-/* why is not _nested version defined */
-static inline int au_rw_read_trylock(struct au_rwsem *rw)
-{
- int ret = down_read_trylock(&rw->rwsem);
- if (ret)
- AuDbgRcntInc(rw);
- return ret;
-}
-
-static inline int au_rw_write_trylock(struct au_rwsem *rw)
-{
- int ret = down_write_trylock(&rw->rwsem);
- if (ret)
- AuDbgWcntInc(rw);
- return ret;
-}
-
-#undef AuDbgCntInit
-#undef AuDbgRcntInc
-#undef AuDbgRcntDec
-#undef AuDbgWcntInc
-#undef AuDbgWcntDec
-
-#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
-static inline void prefix##_read_lock(param) \
-{ au_rw_read_lock(rwsem); } \
-static inline void prefix##_write_lock(param) \
-{ au_rw_write_lock(rwsem); } \
-static inline int prefix##_read_trylock(param) \
-{ return au_rw_read_trylock(rwsem); } \
-static inline int prefix##_write_trylock(param) \
-{ return au_rw_write_trylock(rwsem); }
-/* why is not _nested version defined */
-/* static inline void prefix##_read_trylock_nested(param, lsc)
-{ au_rw_read_trylock_nested(rwsem, lsc)); }
-static inline void prefix##_write_trylock_nestd(param, lsc)
-{ au_rw_write_trylock_nested(rwsem, lsc); } */
-
-#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \
-static inline void prefix##_read_unlock(param) \
-{ au_rw_read_unlock(rwsem); } \
-static inline void prefix##_write_unlock(param) \
-{ au_rw_write_unlock(rwsem); } \
-static inline void prefix##_downgrade_lock(param) \
-{ au_rw_dgrade_lock(rwsem); }
-
-#define AuSimpleRwsemFuncs(prefix, param, rwsem) \
- AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
- AuSimpleUnlockRwsemFuncs(prefix, param, rwsem)
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_RWSEM_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * superblock private data
- */
-
-#include "aufs.h"
-
-/*
- * they are necessary regardless sysfs is disabled.
- */
-void au_si_free(struct kobject *kobj)
-{
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
-
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- AuDebugOn(!list_empty(&sbinfo->si_plink.head));
- AuDebugOn(sbinfo->si_plink_maint);
-
- sb = sbinfo->si_sb;
- si_write_lock(sb);
- au_xino_clr(sb);
- au_br_free(sbinfo);
- kfree(sbinfo->si_branch);
- mutex_destroy(&sbinfo->si_xib_mtx);
- si_write_unlock(sb);
- AuRwDestroy(&sbinfo->si_rwsem);
-
- kfree(sbinfo);
-}
-
-int au_si_alloc(struct super_block *sb)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- err = -ENOMEM;
- sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
- if (unlikely(!sbinfo))
- goto out;
-
- /* will be reallocated separately */
- sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
- if (unlikely(!sbinfo->si_branch))
- goto out_sbinfo;
-
- err = sysaufs_si_init(sbinfo);
- if (unlikely(err))
- goto out_br;
-
- au_nwt_init(&sbinfo->si_nowait);
- au_rw_init_wlock(&sbinfo->si_rwsem);
- sbinfo->si_bend = -1;
-
- sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
- sbinfo->si_wbr_create = AuWbrCreate_Def;
- sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
- sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;
-
- sbinfo->si_mntflags = AuOpt_Def;
-
- mutex_init(&sbinfo->si_xib_mtx);
- sbinfo->si_xino_brid = -1;
- /* leave si_xib_last_pindex and si_xib_next_bit */
-
- sbinfo->si_rdcache = AUFS_RDCACHE_DEF * HZ;
- sbinfo->si_rdblk = AUFS_RDBLK_DEF;
- sbinfo->si_rdhash = AUFS_RDHASH_DEF;
- sbinfo->si_dirwh = AUFS_DIRWH_DEF;
-
- au_spl_init(&sbinfo->si_plink);
- init_waitqueue_head(&sbinfo->si_plink_wq);
- spin_lock_init(&sbinfo->si_plink_maint_lock);
-
- /* leave other members for sysaufs and si_mnt. */
- sbinfo->si_sb = sb;
- sb->s_fs_info = sbinfo;
- au_debug_sbinfo_init(sbinfo);
- return 0; /* success */
-
- out_br:
- kfree(sbinfo->si_branch);
- out_sbinfo:
- kfree(sbinfo);
- out:
- return err;
-}
-
-int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr)
-{
- int err, sz;
- struct au_branch **brp;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*brp) * (sbinfo->si_bend + 1);
- if (unlikely(!sz))
- sz = sizeof(*brp);
- brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS);
- if (brp) {
- sbinfo->si_branch = brp;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-unsigned int au_sigen_inc(struct super_block *sb)
-{
- unsigned int gen;
-
- SiMustWriteLock(sb);
-
- gen = ++au_sbi(sb)->si_generation;
- au_update_digen(sb->s_root);
- au_update_iigen(sb->s_root->d_inode);
- sb->s_root->d_inode->i_version++;
- return gen;
-}
-
-aufs_bindex_t au_new_br_id(struct super_block *sb)
-{
- aufs_bindex_t br_id;
- int i;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- for (i = 0; i <= AUFS_BRANCH_MAX; i++) {
- br_id = ++sbinfo->si_last_br_id;
- if (br_id && au_br_index(sb, br_id) < 0)
- return br_id;
- }
-
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* dentry and super_block lock. call at entry point */
-void aufs_read_lock(struct dentry *dentry, int flags)
-{
- si_read_lock(dentry->d_sb, flags);
- if (au_ftest_lock(flags, DW))
- di_write_lock_child(dentry);
- else
- di_read_lock_child(dentry, flags);
-}
-
-void aufs_read_unlock(struct dentry *dentry, int flags)
-{
- if (au_ftest_lock(flags, DW))
- di_write_unlock(dentry);
- else
- di_read_unlock(dentry, flags);
- si_read_unlock(dentry->d_sb);
-}
-
-void aufs_write_lock(struct dentry *dentry)
-{
- si_write_lock(dentry->d_sb);
- di_write_lock_child(dentry);
-}
-
-void aufs_write_unlock(struct dentry *dentry)
-{
- di_write_unlock(dentry);
- si_write_unlock(dentry->d_sb);
-}
-
-void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags)
-{
- si_read_lock(d1->d_sb, flags);
- di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR));
-}
-
-void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
-{
- di_write_unlock2(d1, d2);
- si_read_unlock(d1->d_sb);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * simple list protected by a spinlock
- */
-
-#ifndef __AUFS_SPL_H__
-#define __AUFS_SPL_H__
-
-#ifdef __KERNEL__
-
-#include <linux/spinlock.h>
-#include <linux/list.h>
-#include <linux/rculist.h>
-
-struct au_splhead {
- spinlock_t spin;
- struct list_head head;
-};
-
-static inline void au_spl_init(struct au_splhead *spl)
-{
- spin_lock_init(&spl->spin);
- INIT_LIST_HEAD(&spl->head);
-}
-
-static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
-{
- spin_lock(&spl->spin);
- list_add(list, &spl->head);
- spin_unlock(&spl->spin);
-}
-
-static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
-{
- spin_lock(&spl->spin);
- list_del(list);
- spin_unlock(&spl->spin);
-}
-
-static inline void au_spl_del_rcu(struct list_head *list,
- struct au_splhead *spl)
-{
- spin_lock(&spl->spin);
- list_del_rcu(list);
- spin_unlock(&spl->spin);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_SPL_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * mount and super_block operations
- */
-
-#include <linux/buffer_head.h>
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/*
- * super_operations
- */
-static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused)
-{
- struct au_icntnr *c;
-
- c = au_cache_alloc_icntnr();
- if (c) {
- c->vfs_inode.i_version = 1; /* sigen(sb); */
- c->iinfo.ii_hinode = NULL;
- return &c->vfs_inode;
- }
- return NULL;
-}
-
-static void aufs_destroy_inode(struct inode *inode)
-{
- au_iinfo_fin(inode);
- au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode));
-}
-
-struct inode *au_iget_locked(struct super_block *sb, ino_t ino)
-{
- struct inode *inode;
- int err;
-
- inode = iget_locked(sb, ino);
- if (unlikely(!inode)) {
- inode = ERR_PTR(-ENOMEM);
- goto out;
- }
- if (!(inode->i_state & I_NEW))
- goto out;
-
- err = au_xigen_new(inode);
- if (!err)
- err = au_iinfo_init(inode);
- if (!err)
- inode->i_version++;
- else {
- iget_failed(inode);
- inode = ERR_PTR(err);
- }
-
- out:
- /* never return NULL */
- AuDebugOn(!inode);
- AuTraceErrPtr(inode);
- return inode;
-}
-
-/* lock free root dinfo */
-static int au_show_brs(struct seq_file *seq, struct super_block *sb)
-{
- int err;
- aufs_bindex_t bindex, bend;
- struct path path;
- struct au_hdentry *hdp;
- struct au_branch *br;
-
- err = 0;
- bend = au_sbend(sb);
- hdp = au_di(sb->s_root)->di_hdentry;
- for (bindex = 0; !err && bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- path.mnt = br->br_mnt;
- path.dentry = hdp[bindex].hd_dentry;
- err = au_seq_path(seq, &path);
- if (err > 0)
- err = seq_printf(seq, "=%s",
- au_optstr_br_perm(br->br_perm));
- if (!err && bindex != bend)
- err = seq_putc(seq, ':');
- }
-
- return err;
-}
-
-static void au_show_wbr_create(struct seq_file *m, int v,
- struct au_sbinfo *sbinfo)
-{
- const char *pat;
-
- AuRwMustAnyLock(&sbinfo->si_rwsem);
-
- seq_printf(m, ",create=");
- pat = au_optstr_wbr_create(v);
- switch (v) {
- case AuWbrCreate_TDP:
- case AuWbrCreate_RR:
- case AuWbrCreate_MFS:
- case AuWbrCreate_PMFS:
- seq_printf(m, pat);
- break;
- case AuWbrCreate_MFSV:
- seq_printf(m, /*pat*/"mfs:%lu",
- sbinfo->si_wbr_mfs.mfs_expire / HZ);
- break;
- case AuWbrCreate_PMFSV:
- seq_printf(m, /*pat*/"pmfs:%lu",
- sbinfo->si_wbr_mfs.mfs_expire / HZ);
- break;
- case AuWbrCreate_MFSRR:
- seq_printf(m, /*pat*/"mfsrr:%llu",
- sbinfo->si_wbr_mfs.mfsrr_watermark);
- break;
- case AuWbrCreate_MFSRRV:
- seq_printf(m, /*pat*/"mfsrr:%llu:%lu",
- sbinfo->si_wbr_mfs.mfsrr_watermark,
- sbinfo->si_wbr_mfs.mfs_expire / HZ);
- break;
- }
-}
-
-static int au_show_xino(struct seq_file *seq, struct vfsmount *mnt)
-{
-#ifdef CONFIG_SYSFS
- return 0;
-#else
- int err;
- const int len = sizeof(AUFS_XINO_FNAME) - 1;
- aufs_bindex_t bindex, brid;
- struct super_block *sb;
- struct qstr *name;
- struct file *f;
- struct dentry *d, *h_root;
- struct au_hdentry *hdp;
-
- AuRwMustAnyLock(&sbinfo->si_rwsem);
-
- err = 0;
- sb = mnt->mnt_sb;
- f = au_sbi(sb)->si_xib;
- if (!f)
- goto out;
-
- /* stop printing the default xino path on the first writable branch */
- h_root = NULL;
- brid = au_xino_brid(sb);
- if (brid >= 0) {
- bindex = au_br_index(sb, brid);
- hdp = au_di(sb->s_root)->di_hdentry;
- h_root = hdp[0 + bindex].hd_dentry;
- }
- d = f->f_dentry;
- name = &d->d_name;
- /* safe ->d_parent because the file is unlinked */
- if (d->d_parent == h_root
- && name->len == len
- && !memcmp(name->name, AUFS_XINO_FNAME, len))
- goto out;
-
- seq_puts(seq, ",xino=");
- err = au_xino_path(seq, f);
-
- out:
- return err;
-#endif
-}
-
-/* seq_file will re-call me in case of too long string */
-static int aufs_show_options(struct seq_file *m, struct vfsmount *mnt)
-{
- int err, n;
- unsigned int mnt_flags, v;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
-#define AuBool(name, str) do { \
- v = au_opt_test(mnt_flags, name); \
- if (v != au_opt_test(AuOpt_Def, name)) \
- seq_printf(m, ",%s" #str, v ? "" : "no"); \
-} while (0)
-
-#define AuStr(name, str) do { \
- v = mnt_flags & AuOptMask_##name; \
- if (v != (AuOpt_Def & AuOptMask_##name)) \
- seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \
-} while (0)
-
-#define AuUInt(name, str, val) do { \
- if (val != AUFS_##name##_DEF) \
- seq_printf(m, "," #str "=%u", val); \
-} while (0)
-
- /* lock free root dinfo */
- sb = mnt->mnt_sb;
- si_noflush_read_lock(sb);
- sbinfo = au_sbi(sb);
- seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo));
-
- mnt_flags = au_mntflags(sb);
- if (au_opt_test(mnt_flags, XINO)) {
- err = au_show_xino(m, mnt);
- if (unlikely(err))
- goto out;
- } else
- seq_puts(m, ",noxino");
-
- AuBool(TRUNC_XINO, trunc_xino);
- AuStr(UDBA, udba);
- AuBool(SHWH, shwh);
- AuBool(PLINK, plink);
- AuBool(DIO, dio);
- /* AuBool(DIRPERM1, dirperm1); */
- /* AuBool(REFROF, refrof); */
-
- v = sbinfo->si_wbr_create;
- if (v != AuWbrCreate_Def)
- au_show_wbr_create(m, v, sbinfo);
-
- v = sbinfo->si_wbr_copyup;
- if (v != AuWbrCopyup_Def)
- seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v));
-
- v = au_opt_test(mnt_flags, ALWAYS_DIROPQ);
- if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ))
- seq_printf(m, ",diropq=%c", v ? 'a' : 'w');
-
- AuUInt(DIRWH, dirwh, sbinfo->si_dirwh);
-
- n = sbinfo->si_rdcache / HZ;
- AuUInt(RDCACHE, rdcache, n);
-
- AuUInt(RDBLK, rdblk, sbinfo->si_rdblk);
- AuUInt(RDHASH, rdhash, sbinfo->si_rdhash);
-
- AuBool(SUM, sum);
- /* AuBool(SUM_W, wsum); */
- AuBool(WARN_PERM, warn_perm);
- AuBool(VERBOSE, verbose);
-
- out:
- /* be sure to print "br:" last */
- if (!sysaufs_brs) {
- seq_puts(m, ",br:");
- au_show_brs(m, sb);
- }
- si_read_unlock(sb);
- return 0;
-
-#undef AuBool
-#undef AuStr
-#undef AuUInt
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* sum mode which returns the summation for statfs(2) */
-
-static u64 au_add_till_max(u64 a, u64 b)
-{
- u64 old;
-
- old = a;
- a += b;
- if (old < a)
- return a;
- return ULLONG_MAX;
-}
-
-static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf)
-{
- int err;
- u64 blocks, bfree, bavail, files, ffree;
- aufs_bindex_t bend, bindex, i;
- unsigned char shared;
- struct vfsmount *h_mnt;
- struct super_block *h_sb;
-
- blocks = 0;
- bfree = 0;
- bavail = 0;
- files = 0;
- ffree = 0;
-
- err = 0;
- bend = au_sbend(sb);
- for (bindex = bend; bindex >= 0; bindex--) {
- h_mnt = au_sbr_mnt(sb, bindex);
- h_sb = h_mnt->mnt_sb;
- shared = 0;
- for (i = bindex + 1; !shared && i <= bend; i++)
- shared = (au_sbr_sb(sb, i) == h_sb);
- if (shared)
- continue;
-
- /* sb->s_root for NFS is unreliable */
- err = vfs_statfs(h_mnt->mnt_root, buf);
- if (unlikely(err))
- goto out;
-
- blocks = au_add_till_max(blocks, buf->f_blocks);
- bfree = au_add_till_max(bfree, buf->f_bfree);
- bavail = au_add_till_max(bavail, buf->f_bavail);
- files = au_add_till_max(files, buf->f_files);
- ffree = au_add_till_max(ffree, buf->f_ffree);
- }
-
- buf->f_blocks = blocks;
- buf->f_bfree = bfree;
- buf->f_bavail = bavail;
- buf->f_files = files;
- buf->f_ffree = ffree;
-
- out:
- return err;
-}
-
-static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
- int err;
- struct super_block *sb;
-
- /* lock free root dinfo */
- sb = dentry->d_sb;
- si_noflush_read_lock(sb);
- if (!au_opt_test(au_mntflags(sb), SUM))
- /* sb->s_root for NFS is unreliable */
- err = vfs_statfs(au_sbr_mnt(sb, 0)->mnt_root, buf);
- else
- err = au_statfs_sum(sb, buf);
- si_read_unlock(sb);
-
- if (!err) {
- buf->f_type = AUFS_SUPER_MAGIC;
- buf->f_namelen = AUFS_MAX_NAMELEN;
- memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
- }
- /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * this IS NOT for super_operations.
- * I guess it will be reverted someday.
- */
-static void aufs_umount_begin(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- sbinfo = au_sbi(sb);
- if (!sbinfo)
- return;
-
- si_write_lock(sb);
- if (au_opt_test(au_mntflags(sb), PLINK))
- au_plink_put(sb);
- if (sbinfo->si_wbr_create_ops->fin)
- sbinfo->si_wbr_create_ops->fin(sb);
- si_write_unlock(sb);
-}
-
-/* final actions when unmounting a file system */
-static void aufs_put_super(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- sbinfo = au_sbi(sb);
- if (!sbinfo)
- return;
-
- aufs_umount_begin(sb);
- dbgaufs_si_fin(sbinfo);
- kobject_put(&sbinfo->si_kobj);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * refresh dentry and inode at remount time.
- */
-static int do_refresh(struct dentry *dentry, mode_t type,
- unsigned int dir_flags)
-{
- int err;
- struct dentry *parent;
-
- di_write_lock_child(dentry);
- parent = dget_parent(dentry);
- di_read_lock_parent(parent, AuLock_IR);
-
- /* returns the number of positive dentries */
- err = au_refresh_hdentry(dentry, type);
- if (err >= 0) {
- struct inode *inode = dentry->d_inode;
- err = au_refresh_hinode(inode, dentry);
- if (!err && type == S_IFDIR)
- au_hn_reset(inode, dir_flags);
- }
- if (unlikely(err))
- pr_err("unrecoverable error %d, %.*s\n",
- err, AuDLNPair(dentry));
-
- di_read_unlock(parent, AuLock_IR);
- dput(parent);
- di_write_unlock(dentry);
-
- return err;
-}
-
-static int test_dir(struct dentry *dentry, void *arg __maybe_unused)
-{
- return S_ISDIR(dentry->d_inode->i_mode);
-}
-
-/* gave up consolidating with refresh_nondir() */
-static int refresh_dir(struct dentry *root, unsigned int sigen)
-{
- int err, i, j, ndentry, e;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries;
- struct inode *inode;
- const unsigned int flags = au_hi_flags(root->d_inode, /*isdir*/1);
-
- err = 0;
- list_for_each_entry(inode, &root->d_sb->s_inodes, i_sb_list)
- if (S_ISDIR(inode->i_mode) && au_iigen(inode) != sigen) {
- ii_write_lock_child(inode);
- e = au_refresh_hinode_self(inode, /*do_attr*/1);
- ii_write_unlock(inode);
- if (unlikely(e)) {
- AuDbg("e %d, i%lu\n", e, inode->i_ino);
- if (!err)
- err = e;
- /* go on even if err */
- }
- }
-
- e = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(e)) {
- if (!err)
- err = e;
- goto out;
- }
- e = au_dcsub_pages(&dpages, root, test_dir, NULL);
- if (unlikely(e)) {
- if (!err)
- err = e;
- goto out_dpages;
- }
-
- for (i = 0; !e && i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; !e && j < ndentry; j++) {
- struct dentry *d;
-
- d = dentries[j];
- au_dbg_verify_dir_parent(d, sigen);
- if (au_digen(d) != sigen) {
- e = do_refresh(d, S_IFDIR, flags);
- if (unlikely(e && !err))
- err = e;
- /* break on err */
- }
- }
- }
-
- out_dpages:
- au_dpages_free(&dpages);
- out:
- return err;
-}
-
-static int test_nondir(struct dentry *dentry, void *arg __maybe_unused)
-{
- return !S_ISDIR(dentry->d_inode->i_mode);
-}
-
-static int refresh_nondir(struct dentry *root, unsigned int sigen,
- int do_dentry)
-{
- int err, i, j, ndentry, e;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries;
- struct inode *inode;
-
- err = 0;
- list_for_each_entry(inode, &root->d_sb->s_inodes, i_sb_list)
- if (!S_ISDIR(inode->i_mode) && au_iigen(inode) != sigen) {
- ii_write_lock_child(inode);
- e = au_refresh_hinode_self(inode, /*do_attr*/1);
- ii_write_unlock(inode);
- if (unlikely(e)) {
- AuDbg("e %d, i%lu\n", e, inode->i_ino);
- if (!err)
- err = e;
- /* go on even if err */
- }
- }
-
- if (!do_dentry)
- goto out;
-
- e = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(e)) {
- if (!err)
- err = e;
- goto out;
- }
- e = au_dcsub_pages(&dpages, root, test_nondir, NULL);
- if (unlikely(e)) {
- if (!err)
- err = e;
- goto out_dpages;
- }
-
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++) {
- struct dentry *d;
-
- d = dentries[j];
- au_dbg_verify_nondir_parent(d, sigen);
- inode = d->d_inode;
- if (inode && au_digen(d) != sigen) {
- e = do_refresh(d, inode->i_mode & S_IFMT,
- /*dir_flags*/0);
- if (unlikely(e && !err))
- err = e;
- /* go on even err */
- }
- }
- }
-
- out_dpages:
- au_dpages_free(&dpages);
- out:
- return err;
-}
-
-static void au_remount_refresh(struct super_block *sb, unsigned int flags)
-{
- int err;
- unsigned int sigen;
- struct au_sbinfo *sbinfo;
- struct dentry *root;
- struct inode *inode;
-
- au_sigen_inc(sb);
- sigen = au_sigen(sb);
- sbinfo = au_sbi(sb);
- au_fclr_si(sbinfo, FAILED_REFRESH_DIRS);
-
- root = sb->s_root;
- DiMustNoWaiters(root);
- inode = root->d_inode;
- IiMustNoWaiters(inode);
- au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1));
- di_write_unlock(root);
-
- err = refresh_dir(root, sigen);
- if (unlikely(err)) {
- au_fset_si(sbinfo, FAILED_REFRESH_DIRS);
- pr_warning("Refreshing directories failed, ignored (%d)\n",
- err);
- }
-
- if (au_ftest_opts(flags, REFRESH_NONDIR)) {
- err = refresh_nondir(root, sigen, !err);
- if (unlikely(err))
- pr_warning("Refreshing non-directories failed, ignored"
- "(%d)\n", err);
- }
-
- /* aufs_write_lock() calls ..._child() */
- di_write_lock_child(root);
- au_cpup_attr_all(root->d_inode, /*force*/1);
-}
-
-/* stop extra interpretation of errno in mount(8), and strange error messages */
-static int cvt_err(int err)
-{
- AuTraceErr(err);
-
- switch (err) {
- case -ENOENT:
- case -ENOTDIR:
- case -EEXIST:
- case -EIO:
- err = -EINVAL;
- }
- return err;
-}
-
-static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
- int err, do_dx;
- unsigned int mntflags;
- struct au_opts opts;
- struct dentry *root;
- struct inode *inode;
- struct au_sbinfo *sbinfo;
-
- err = 0;
- root = sb->s_root;
- if (!data || !*data) {
- aufs_write_lock(root);
- err = au_opts_verify(sb, *flags, /*pending*/0);
- aufs_write_unlock(root);
- goto out;
- }
-
- err = -ENOMEM;
- memset(&opts, 0, sizeof(opts));
- opts.opt = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!opts.opt))
- goto out;
- opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
- opts.flags = AuOpts_REMOUNT;
- opts.sb_flags = *flags;
-
- /* parse it before aufs lock */
- err = au_opts_parse(sb, data, &opts);
- if (unlikely(err))
- goto out_opts;
-
- sbinfo = au_sbi(sb);
- inode = root->d_inode;
- mutex_lock(&inode->i_mutex);
- aufs_write_lock(root);
-
- /* au_opts_remount() may return an error */
- err = au_opts_remount(sb, &opts);
- au_opts_free(&opts);
-
- if (au_ftest_opts(opts.flags, REFRESH_DIR)
- || au_ftest_opts(opts.flags, REFRESH_NONDIR))
- au_remount_refresh(sb, opts.flags);
-
- if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) {
- mntflags = au_mntflags(sb);
- do_dx = !!au_opt_test(mntflags, DIO);
- au_dy_arefresh(do_dx);
- }
-
- aufs_write_unlock(root);
- mutex_unlock(&inode->i_mutex);
-
- out_opts:
- free_page((unsigned long)opts.opt);
- out:
- err = cvt_err(err);
- AuTraceErr(err);
- return err;
-}
-
-static const struct super_operations aufs_sop = {
- .alloc_inode = aufs_alloc_inode,
- .destroy_inode = aufs_destroy_inode,
- .drop_inode = generic_delete_inode,
- .show_options = aufs_show_options,
- .statfs = aufs_statfs,
- .put_super = aufs_put_super,
- .remount_fs = aufs_remount_fs
-};
-
-/* ---------------------------------------------------------------------- */
-
-static int alloc_root(struct super_block *sb)
-{
- int err;
- struct inode *inode;
- struct dentry *root;
-
- err = -ENOMEM;
- inode = au_iget_locked(sb, AUFS_ROOT_INO);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out;
-
- inode->i_op = &aufs_dir_iop;
- inode->i_fop = &aufs_dir_fop;
- inode->i_mode = S_IFDIR;
- inode->i_nlink = 2;
- unlock_new_inode(inode);
-
- root = d_alloc_root(inode);
- if (unlikely(!root))
- goto out_iput;
- err = PTR_ERR(root);
- if (IS_ERR(root))
- goto out_iput;
-
- err = au_di_init(root);
- if (!err) {
- sb->s_root = root;
- return 0; /* success */
- }
- dput(root);
- goto out; /* do not iput */
-
- out_iput:
- iget_failed(inode);
- iput(inode);
- out:
- return err;
-
-}
-
-static int aufs_fill_super(struct super_block *sb, void *raw_data,
- int silent __maybe_unused)
-{
- int err;
- struct au_opts opts;
- struct dentry *root;
- struct inode *inode;
- char *arg = raw_data;
-
- if (unlikely(!arg || !*arg)) {
- err = -EINVAL;
- pr_err("no arg\n");
- goto out;
- }
-
- err = -ENOMEM;
- memset(&opts, 0, sizeof(opts));
- opts.opt = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!opts.opt))
- goto out;
- opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
- opts.sb_flags = sb->s_flags;
-
- err = au_si_alloc(sb);
- if (unlikely(err))
- goto out_opts;
-
- /* all timestamps always follow the ones on the branch */
- sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
- sb->s_op = &aufs_sop;
- sb->s_magic = AUFS_SUPER_MAGIC;
- sb->s_maxbytes = 0;
- au_export_init(sb);
-
- err = alloc_root(sb);
- if (unlikely(err)) {
- si_write_unlock(sb);
- goto out_info;
- }
- root = sb->s_root;
- inode = root->d_inode;
-
- /*
- * actually we can parse options regardless aufs lock here.
- * but at remount time, parsing must be done before aufs lock.
- * so we follow the same rule.
- */
- ii_write_lock_parent(inode);
- aufs_write_unlock(root);
- err = au_opts_parse(sb, arg, &opts);
- if (unlikely(err))
- goto out_root;
-
- /* lock vfs_inode first, then aufs. */
- mutex_lock(&inode->i_mutex);
- aufs_write_lock(root);
- err = au_opts_mount(sb, &opts);
- au_opts_free(&opts);
- aufs_write_unlock(root);
- mutex_unlock(&inode->i_mutex);
- if (!err)
- goto out_opts; /* success */
-
- out_root:
- dput(root);
- sb->s_root = NULL;
- out_info:
- kobject_put(&au_sbi(sb)->si_kobj);
- sb->s_fs_info = NULL;
- out_opts:
- free_page((unsigned long)opts.opt);
- out:
- AuTraceErr(err);
- err = cvt_err(err);
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_get_sb(struct file_system_type *fs_type, int flags,
- const char *dev_name __maybe_unused, void *raw_data,
- struct vfsmount *mnt)
-{
- int err;
- struct super_block *sb;
-
- /* all timestamps always follow the ones on the branch */
- /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */
- err = get_sb_nodev(fs_type, flags, raw_data, aufs_fill_super, mnt);
- if (!err) {
- sb = mnt->mnt_sb;
- si_write_lock(sb);
- sysaufs_brs_add(sb, 0);
- si_write_unlock(sb);
- }
- return err;
-}
-
-struct file_system_type aufs_fs_type = {
- .name = AUFS_FSTYPE,
- .fs_flags =
- FS_RENAME_DOES_D_MOVE /* a race between rename and others */
- | FS_REVAL_DOT, /* for NFS branch and udba */
- .get_sb = aufs_get_sb,
- .kill_sb = generic_shutdown_super,
- /* no need to __module_get() and module_put(). */
- .owner = THIS_MODULE,
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * super_block operations
- */
-
-#ifndef __AUFS_SUPER_H__
-#define __AUFS_SUPER_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/aufs_type.h>
-#include "rwsem.h"
-#include "spl.h"
-#include "wkq.h"
-
-typedef ssize_t (*au_readf_t)(struct file *, char __user *, size_t, loff_t *);
-typedef ssize_t (*au_writef_t)(struct file *, const char __user *, size_t,
- loff_t *);
-
-/* policies to select one among multiple writable branches */
-struct au_wbr_copyup_operations {
- int (*copyup)(struct dentry *dentry);
-};
-
-struct au_wbr_create_operations {
- int (*create)(struct dentry *dentry, int isdir);
- int (*init)(struct super_block *sb);
- int (*fin)(struct super_block *sb);
-};
-
-struct au_wbr_mfs {
- struct mutex mfs_lock; /* protect this structure */
- unsigned long mfs_jiffy;
- unsigned long mfs_expire;
- aufs_bindex_t mfs_bindex;
-
- unsigned long long mfsrr_bytes;
- unsigned long long mfsrr_watermark;
-};
-
-struct au_branch;
-struct au_sbinfo {
- /* nowait tasks in the system-wide workqueue */
- struct au_nowait_tasks si_nowait;
-
- struct au_rwsem si_rwsem;
-
- /* branch management */
- unsigned int si_generation;
-
- /* see above flags */
- unsigned char au_si_status;
-
- aufs_bindex_t si_bend;
- aufs_bindex_t si_last_br_id;
- struct au_branch **si_branch;
-
- /* policy to select a writable branch */
- unsigned char si_wbr_copyup;
- unsigned char si_wbr_create;
- struct au_wbr_copyup_operations *si_wbr_copyup_ops;
- struct au_wbr_create_operations *si_wbr_create_ops;
-
- /* round robin */
- atomic_t si_wbr_rr_next;
-
- /* most free space */
- struct au_wbr_mfs si_wbr_mfs;
-
- /* mount flags */
- /* include/asm-ia64/siginfo.h defines a macro named si_flags */
- unsigned int si_mntflags;
-
- /* external inode number (bitmap and translation table) */
- au_readf_t si_xread;
- au_writef_t si_xwrite;
- struct file *si_xib;
- struct mutex si_xib_mtx; /* protect xib members */
- unsigned long *si_xib_buf;
- unsigned long si_xib_last_pindex;
- int si_xib_next_bit;
- aufs_bindex_t si_xino_brid;
- /* reserved for future use */
- /* unsigned long long si_xib_limit; */ /* Max xib file size */
-
-#ifdef CONFIG_AUFS_EXPORT
- /* i_generation */
- struct file *si_xigen;
- atomic_t si_xigen_next;
-#endif
-
- /* vdir parameters */
- unsigned long si_rdcache; /* max cache time in HZ */
- unsigned int si_rdblk; /* deblk size */
- unsigned int si_rdhash; /* hash size */
-
- /*
- * If the number of whiteouts are larger than si_dirwh, leave all of
- * them after au_whtmp_ren to reduce the cost of rmdir(2).
- * future fsck.aufs or kernel thread will remove them later.
- * Otherwise, remove all whiteouts and the dir in rmdir(2).
- */
- unsigned int si_dirwh;
-
- /*
- * rename(2) a directory with all children.
- */
- /* reserved for future use */
- /* int si_rendir; */
-
- /* pseudo_link list */
- struct au_splhead si_plink;
- wait_queue_head_t si_plink_wq;
- spinlock_t si_plink_maint_lock;
- struct file *si_plink_maint;
-
- /*
- * sysfs and lifetime management.
- * this is not a small structure and it may be a waste of memory in case
- * of sysfs is disabled, particulary when many aufs-es are mounted.
- * but using sysfs is majority.
- */
- struct kobject si_kobj;
-#ifdef CONFIG_DEBUG_FS
- struct dentry *si_dbgaufs, *si_dbgaufs_xib;
-#ifdef CONFIG_AUFS_EXPORT
- struct dentry *si_dbgaufs_xigen;
-#endif
-#endif
-
- /* dirty, necessary for unmounting, sysfs and sysrq */
- struct super_block *si_sb;
-};
-
-/* sbinfo status flags */
-/*
- * set true when refresh_dirs() failed at remount time.
- * then try refreshing dirs at access time again.
- * if it is false, refreshing dirs at access time is unnecesary
- */
-#define AuSi_FAILED_REFRESH_DIRS 1
-static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi,
- unsigned int flag)
-{
- AuRwMustAnyLock(&sbi->si_rwsem);
- return sbi->au_si_status & flag;
-}
-#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name)
-#define au_fset_si(sbinfo, name) do { \
- AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
- (sbinfo)->au_si_status |= AuSi_##name; \
-} while (0)
-#define au_fclr_si(sbinfo, name) do { \
- AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
- (sbinfo)->au_si_status &= ~AuSi_##name; \
-} while (0)
-
-/* ---------------------------------------------------------------------- */
-
-/* policy to select one among writable branches */
-#define AuWbrCopyup(sbinfo, ...) \
- ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__))
-#define AuWbrCreate(sbinfo, ...) \
- ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__))
-
-/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */
-#define AuLock_DW 1 /* write-lock dentry */
-#define AuLock_IR (1 << 1) /* read-lock inode */
-#define AuLock_IW (1 << 2) /* write-lock inode */
-#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */
-#define AuLock_DIR (1 << 4) /* target is a dir */
-#define au_ftest_lock(flags, name) ((flags) & AuLock_##name)
-#define au_fset_lock(flags, name) { (flags) |= AuLock_##name; }
-#define au_fclr_lock(flags, name) { (flags) &= ~AuLock_##name; }
-
-/* ---------------------------------------------------------------------- */
-
-/* super.c */
-extern struct file_system_type aufs_fs_type;
-struct inode *au_iget_locked(struct super_block *sb, ino_t ino);
-
-/* sbinfo.c */
-void au_si_free(struct kobject *kobj);
-int au_si_alloc(struct super_block *sb);
-int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr);
-
-unsigned int au_sigen_inc(struct super_block *sb);
-aufs_bindex_t au_new_br_id(struct super_block *sb);
-
-void aufs_read_lock(struct dentry *dentry, int flags);
-void aufs_read_unlock(struct dentry *dentry, int flags);
-void aufs_write_lock(struct dentry *dentry);
-void aufs_write_unlock(struct dentry *dentry);
-void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int isdir);
-void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
-
-/* wbr_policy.c */
-extern struct au_wbr_copyup_operations au_wbr_copyup_ops[];
-extern struct au_wbr_create_operations au_wbr_create_ops[];
-int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_sbinfo *au_sbi(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_EXPORT
-void au_export_init(struct super_block *sb);
-
-static inline int au_test_nfsd(struct task_struct *tsk)
-{
- return !tsk->mm && !strcmp(tsk->comm, "nfsd");
-}
-
-int au_xigen_inc(struct inode *inode);
-int au_xigen_new(struct inode *inode);
-int au_xigen_set(struct super_block *sb, struct file *base);
-void au_xigen_clr(struct super_block *sb);
-
-static inline int au_busy_or_stale(void)
-{
- if (!au_test_nfsd(current))
- return -EBUSY;
- return -ESTALE;
-}
-#else
-AuStubVoid(au_export_init, struct super_block *sb)
-AuStubInt0(au_test_nfsd, struct task_struct *tsk)
-AuStubInt0(au_xigen_inc, struct inode *inode)
-AuStubInt0(au_xigen_new, struct inode *inode)
-AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base)
-AuStubVoid(au_xigen_clr, struct super_block *sb)
-static inline int au_busy_or_stale(void)
-{
- return -EBUSY;
-}
-#endif /* CONFIG_AUFS_EXPORT */
-
-/* ---------------------------------------------------------------------- */
-
-static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo)
-{
- /*
- * This function is a dynamic '__init' fucntion actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-#ifdef CONFIG_DEBUG_FS
- sbinfo->si_dbgaufs = NULL;
- sbinfo->si_dbgaufs_xib = NULL;
-#ifdef CONFIG_AUFS_EXPORT
- sbinfo->si_dbgaufs_xigen = NULL;
-#endif
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* lock superblock. mainly for entry point functions */
-/*
- * si_noflush_read_lock, si_noflush_write_lock,
- * si_read_unlock, si_write_unlock, si_downgrade_lock
- */
-AuSimpleLockRwsemFuncs(si_noflush, struct super_block *sb,
- &au_sbi(sb)->si_rwsem);
-AuSimpleUnlockRwsemFuncs(si, struct super_block *sb, &au_sbi(sb)->si_rwsem);
-
-#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem)
-#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem)
-#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem)
-
-static inline void si_read_lock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- si_noflush_read_lock(sb);
-}
-
-static inline void si_write_lock(struct super_block *sb)
-{
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- si_noflush_write_lock(sb);
-}
-
-static inline int si_read_trylock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- return si_noflush_read_trylock(sb);
-}
-
-static inline int si_write_trylock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- return si_noflush_write_trylock(sb);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline aufs_bindex_t au_sbend(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_bend;
-}
-
-static inline unsigned int au_mntflags(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_mntflags;
-}
-
-static inline unsigned int au_sigen(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_generation;
-}
-
-static inline struct au_branch *au_sbr(struct super_block *sb,
- aufs_bindex_t bindex)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_branch[0 + bindex];
-}
-
-static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid)
-{
- SiMustWriteLock(sb);
- au_sbi(sb)->si_xino_brid = brid;
-}
-
-static inline aufs_bindex_t au_xino_brid(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_xino_brid;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_SUPER_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sysfs interface and lifetime management
- * they are necessary regardless sysfs is disabled.
- */
-
-#include <linux/fs.h>
-#include <linux/random.h>
-#include <linux/sysfs.h>
-#include "aufs.h"
-
-unsigned long sysaufs_si_mask;
-struct kset *sysaufs_ket;
-
-#define AuSiAttr(_name) { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = sysaufs_si_##_name, \
-}
-
-static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
-struct attribute *sysaufs_si_attrs[] = {
- &sysaufs_si_attr_xi_path.attr,
- NULL,
-};
-
-static const struct sysfs_ops au_sbi_ops = {
- .show = sysaufs_si_show
-};
-
-static struct kobj_type au_sbi_ktype = {
- .release = au_si_free,
- .sysfs_ops = &au_sbi_ops,
- .default_attrs = sysaufs_si_attrs
-};
-
-/* ---------------------------------------------------------------------- */
-
-int sysaufs_si_init(struct au_sbinfo *sbinfo)
-{
- int err;
-
- sbinfo->si_kobj.kset = sysaufs_ket;
- /* cf. sysaufs_name() */
- err = kobject_init_and_add
- (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_ket->kobj*/NULL,
- SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
-
- dbgaufs_si_null(sbinfo);
- if (!err) {
- err = dbgaufs_si_init(sbinfo);
- if (unlikely(err))
- kobject_put(&sbinfo->si_kobj);
- }
- return err;
-}
-
-void sysaufs_fin(void)
-{
- dbgaufs_fin();
- sysfs_remove_group(&sysaufs_ket->kobj, sysaufs_attr_group);
- kset_unregister(sysaufs_ket);
-}
-
-int __init sysaufs_init(void)
-{
- int err;
-
- do {
- get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
- } while (!sysaufs_si_mask);
-
- err = -EINVAL;
- sysaufs_ket = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
- if (unlikely(!sysaufs_ket))
- goto out;
- err = PTR_ERR(sysaufs_ket);
- if (IS_ERR(sysaufs_ket))
- goto out;
- err = sysfs_create_group(&sysaufs_ket->kobj, sysaufs_attr_group);
- if (unlikely(err)) {
- kset_unregister(sysaufs_ket);
- goto out;
- }
-
- err = dbgaufs_init();
- if (unlikely(err))
- sysaufs_fin();
- out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sysfs interface and mount lifetime management
- */
-
-#ifndef __SYSAUFS_H__
-#define __SYSAUFS_H__
-
-#ifdef __KERNEL__
-
-#include <linux/sysfs.h>
-#include <linux/aufs_type.h>
-#include "module.h"
-
-struct super_block;
-struct au_sbinfo;
-
-struct sysaufs_si_attr {
- struct attribute attr;
- int (*show)(struct seq_file *seq, struct super_block *sb);
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* sysaufs.c */
-extern unsigned long sysaufs_si_mask;
-extern struct kset *sysaufs_ket;
-extern struct attribute *sysaufs_si_attrs[];
-int sysaufs_si_init(struct au_sbinfo *sbinfo);
-int __init sysaufs_init(void);
-void sysaufs_fin(void);
-
-/* ---------------------------------------------------------------------- */
-
-/* some people doesn't like to show a pointer in kernel */
-static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
-{
- return sysaufs_si_mask ^ (unsigned long)sbinfo;
-}
-
-#define SysaufsSiNamePrefix "si_"
-#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16)
-static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
-{
- snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
- sysaufs_si_id(sbinfo));
-}
-
-struct au_branch;
-#ifdef CONFIG_SYSFS
-/* sysfs.c */
-extern struct attribute_group *sysaufs_attr_group;
-
-int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
-ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
- char *buf);
-
-void sysaufs_br_init(struct au_branch *br);
-void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
-void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
-
-#define sysaufs_brs_init() do {} while (0)
-
-#else
-#define sysaufs_attr_group NULL
-
-AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
-
-static inline
-ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- return 0;
-}
-
-AuStubVoid(sysaufs_br_init, struct au_branch *br)
-AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
-
-static inline void sysaufs_brs_init(void)
-{
- sysaufs_brs = 0;
-}
-
-#endif /* CONFIG_SYSFS */
-
-#endif /* __KERNEL__ */
-#endif /* __SYSAUFS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sysfs interface
- */
-
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/sysfs.h>
-#include "aufs.h"
-
-#ifdef CONFIG_AUFS_FS_MODULE
-/* this entry violates the "one line per file" policy of sysfs */
-static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr,
- char *buf)
-{
- ssize_t err;
- static char *conf =
-/* this file is generated at compiling */
-#include "conf.str"
- ;
-
- err = snprintf(buf, PAGE_SIZE, conf);
- if (unlikely(err >= PAGE_SIZE))
- err = -EFBIG;
- return err;
-}
-
-static struct kobj_attribute au_config_attr = __ATTR_RO(config);
-#endif
-
-static struct attribute *au_attr[] = {
-#ifdef CONFIG_AUFS_FS_MODULE
- &au_config_attr.attr,
-#endif
- NULL, /* need to NULL terminate the list of attributes */
-};
-
-static struct attribute_group sysaufs_attr_group_body = {
- .attrs = au_attr
-};
-
-struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body;
-
-/* ---------------------------------------------------------------------- */
-
-int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb)
-{
- int err;
-
- SiMustAnyLock(sb);
-
- err = 0;
- if (au_opt_test(au_mntflags(sb), XINO)) {
- err = au_xino_path(seq, au_sbi(sb)->si_xib);
- seq_putc(seq, '\n');
- }
- return err;
-}
-
-/*
- * the lifetime of branch is independent from the entry under sysfs.
- * sysfs handles the lifetime of the entry, and never call ->show() after it is
- * unlinked.
- */
-static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
- aufs_bindex_t bindex)
-{
- struct path path;
- struct dentry *root;
- struct au_branch *br;
-
- AuDbg("b%d\n", bindex);
-
- root = sb->s_root;
- di_read_lock_parent(root, !AuLock_IR);
- br = au_sbr(sb, bindex);
- path.mnt = br->br_mnt;
- path.dentry = au_h_dptr(root, bindex);
- au_seq_path(seq, &path);
- di_read_unlock(root, !AuLock_IR);
- seq_printf(seq, "=%s\n", au_optstr_br_perm(br->br_perm));
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct seq_file *au_seq(char *p, ssize_t len)
-{
- struct seq_file *seq;
-
- seq = kzalloc(sizeof(*seq), GFP_NOFS);
- if (seq) {
- /* mutex_init(&seq.lock); */
- seq->buf = p;
- seq->size = len;
- return seq; /* success */
- }
-
- seq = ERR_PTR(-ENOMEM);
- return seq;
-}
-
-#define SysaufsBr_PREFIX "br"
-
-/* todo: file size may exceed PAGE_SIZE */
-ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- ssize_t err;
- long l;
- aufs_bindex_t bend;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
- struct seq_file *seq;
- char *name;
- struct attribute **cattr;
-
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- sb = sbinfo->si_sb;
-
- /*
- * prevent a race condition between sysfs and aufs.
- * for instance, sysfs_file_read() calls sysfs_get_active_two() which
- * prohibits maintaining the sysfs entries.
- * hew we acquire read lock after sysfs_get_active_two().
- * on the other hand, the remount process may maintain the sysfs/aufs
- * entries after acquiring write lock.
- * it can cause a deadlock.
- * simply we gave up processing read here.
- */
- err = -EBUSY;
- if (unlikely(!si_noflush_read_trylock(sb)))
- goto out;
-
- seq = au_seq(buf, PAGE_SIZE);
- err = PTR_ERR(seq);
- if (IS_ERR(seq))
- goto out_unlock;
-
- name = (void *)attr->name;
- cattr = sysaufs_si_attrs;
- while (*cattr) {
- if (!strcmp(name, (*cattr)->name)) {
- err = container_of(*cattr, struct sysaufs_si_attr, attr)
- ->show(seq, sb);
- goto out_seq;
- }
- cattr++;
- }
-
- bend = au_sbend(sb);
- if (!strncmp(name, SysaufsBr_PREFIX, sizeof(SysaufsBr_PREFIX) - 1)) {
- name += sizeof(SysaufsBr_PREFIX) - 1;
- err = strict_strtol(name, 10, &l);
- if (!err) {
- if (l <= bend)
- err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l);
- else
- err = -ENOENT;
- }
- goto out_seq;
- }
- BUG();
-
- out_seq:
- if (!err) {
- err = seq->count;
- /* sysfs limit */
- if (unlikely(err == PAGE_SIZE))
- err = -EFBIG;
- }
- kfree(seq);
- out_unlock:
- si_read_unlock(sb);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void sysaufs_br_init(struct au_branch *br)
-{
- struct attribute *attr = &br->br_attr;
-
- sysfs_attr_init(attr);
- attr->name = br->br_name;
- attr->mode = S_IRUGO;
- attr->owner = THIS_MODULE;
-}
-
-void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-{
- struct au_branch *br;
- struct kobject *kobj;
- aufs_bindex_t bend;
-
- dbgaufs_brs_del(sb, bindex);
-
- if (!sysaufs_brs)
- return;
-
- kobj = &au_sbi(sb)->si_kobj;
- bend = au_sbend(sb);
- for (; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- sysfs_remove_file(kobj, &br->br_attr);
- }
-}
-
-void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err;
- aufs_bindex_t bend;
- struct kobject *kobj;
- struct au_branch *br;
-
- dbgaufs_brs_add(sb, bindex);
-
- if (!sysaufs_brs)
- return;
-
- kobj = &au_sbi(sb)->si_kobj;
- bend = au_sbend(sb);
- for (; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- snprintf(br->br_name, sizeof(br->br_name), SysaufsBr_PREFIX
- "%d", bindex);
- err = sysfs_create_file(kobj, &br->br_attr);
- if (unlikely(err))
- pr_warning("failed %s under sysfs(%d)\n",
- br->br_name, err);
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * magic sysrq hanlder
- */
-
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-/* #include <linux/sysrq.h> */
-#include "aufs.h"
-
-/* ---------------------------------------------------------------------- */
-
-static void sysrq_sb(struct super_block *sb)
-{
- char *plevel;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- plevel = au_plevel;
- au_plevel = KERN_WARNING;
- au_debug(1);
-
- sbinfo = au_sbi(sb);
- /* since we define pr_fmt, call printk directly */
- printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo));
- printk(KERN_WARNING AUFS_NAME ": superblock\n");
- au_dpri_sb(sb);
- printk(KERN_WARNING AUFS_NAME ": root dentry\n");
- au_dpri_dentry(sb->s_root);
- printk(KERN_WARNING AUFS_NAME ": root inode\n");
- au_dpri_inode(sb->s_root->d_inode);
-#if 0
- struct inode *i;
- printk(KERN_WARNING AUFS_NAME ": isolated inode\n");
- list_for_each_entry(i, &sb->s_inodes, i_sb_list)
- if (list_empty(&i->i_dentry))
- au_dpri_inode(i);
-#endif
- printk(KERN_WARNING AUFS_NAME ": files\n");
- list_for_each_entry(file, &sb->s_files, f_u.fu_list) {
- umode_t mode;
- mode = file->f_dentry->d_inode->i_mode;
- if (!special_file(mode) || au_special_file(mode))
- au_dpri_file(file);
- }
-
- au_plevel = plevel;
- au_debug(0);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* module parameter */
-static char *aufs_sysrq_key = "a";
-module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
-MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
-
-static void au_sysrq(int key __maybe_unused,
- struct tty_struct *tty __maybe_unused)
-{
- struct kobject *kobj;
- struct au_sbinfo *sbinfo;
-
- /* spin_lock(&sysaufs_ket->list_lock); */
- list_for_each_entry(kobj, &sysaufs_ket->list, entry) {
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- sysrq_sb(sbinfo->si_sb);
- }
- /* spin_unlock(&sysaufs_ket->list_lock); */
-}
-
-static struct sysrq_key_op au_sysrq_op = {
- .handler = au_sysrq,
- .help_msg = "Aufs",
- .action_msg = "Aufs",
- .enable_mask = SYSRQ_ENABLE_DUMP
-};
-
-/* ---------------------------------------------------------------------- */
-
-int __init au_sysrq_init(void)
-{
- int err;
- char key;
-
- err = -1;
- key = *aufs_sysrq_key;
- if ('a' <= key && key <= 'z')
- err = register_sysrq_key(key, &au_sysrq_op);
- if (unlikely(err))
- pr_err("err %d, sysrq=%c\n", err, key);
- return err;
-}
-
-void au_sysrq_fin(void)
-{
- int err;
- err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
- if (unlikely(err))
- pr_err("err %d (ignored)\n", err);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * virtual or vertical directory
- */
-
-#include <linux/hash.h>
-#include "aufs.h"
-
-static unsigned int calc_size(int nlen)
-{
- return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t));
-}
-
-static int set_deblk_end(union au_vdir_deblk_p *p,
- union au_vdir_deblk_p *deblk_end)
-{
- if (calc_size(0) <= deblk_end->deblk - p->deblk) {
- p->de->de_str.len = 0;
- /* smp_mb(); */
- return 0;
- }
- return -1; /* error */
-}
-
-/* returns true or false */
-static int is_deblk_end(union au_vdir_deblk_p *p,
- union au_vdir_deblk_p *deblk_end)
-{
- if (calc_size(0) <= deblk_end->deblk - p->deblk)
- return !p->de->de_str.len;
- return 1;
-}
-
-static unsigned char *last_deblk(struct au_vdir *vdir)
-{
- return vdir->vd_deblk[vdir->vd_nblk - 1];
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* estimate the apropriate size for name hash table */
-unsigned int au_rdhash_est(loff_t sz)
-{
- unsigned int n;
-
- n = UINT_MAX;
- sz >>= 10;
- if (sz < n)
- n = sz;
- if (sz < AUFS_RDHASH_DEF)
- n = AUFS_RDHASH_DEF;
- /* pr_info("n %u\n", n); */
- return n;
-}
-
-/*
- * the allocated memory has to be freed by
- * au_nhash_wh_free() or au_nhash_de_free().
- */
-int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp)
-{
- struct hlist_head *head;
- unsigned int u;
-
- head = kmalloc(sizeof(*nhash->nh_head) * num_hash, gfp);
- if (head) {
- nhash->nh_num = num_hash;
- nhash->nh_head = head;
- for (u = 0; u < num_hash; u++)
- INIT_HLIST_HEAD(head++);
- return 0; /* success */
- }
-
- return -ENOMEM;
-}
-
-static void nhash_count(struct hlist_head *head)
-{
-#if 0
- unsigned long n;
- struct hlist_node *pos;
-
- n = 0;
- hlist_for_each(pos, head)
- n++;
- pr_info("%lu\n", n);
-#endif
-}
-
-static void au_nhash_wh_do_free(struct hlist_head *head)
-{
- struct au_vdir_wh *tpos;
- struct hlist_node *pos, *node;
-
- hlist_for_each_entry_safe(tpos, pos, node, head, wh_hash) {
- /* hlist_del(pos); */
- kfree(tpos);
- }
-}
-
-static void au_nhash_de_do_free(struct hlist_head *head)
-{
- struct au_vdir_dehstr *tpos;
- struct hlist_node *pos, *node;
-
- hlist_for_each_entry_safe(tpos, pos, node, head, hash) {
- /* hlist_del(pos); */
- au_cache_free_vdir_dehstr(tpos);
- }
-}
-
-static void au_nhash_do_free(struct au_nhash *nhash,
- void (*free)(struct hlist_head *head))
-{
- unsigned int n;
- struct hlist_head *head;
-
- n = nhash->nh_num;
- if (!n)
- return;
-
- head = nhash->nh_head;
- while (n-- > 0) {
- nhash_count(head);
- free(head++);
- }
- kfree(nhash->nh_head);
-}
-
-void au_nhash_wh_free(struct au_nhash *whlist)
-{
- au_nhash_do_free(whlist, au_nhash_wh_do_free);
-}
-
-static void au_nhash_de_free(struct au_nhash *delist)
-{
- au_nhash_do_free(delist, au_nhash_de_do_free);
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
- int limit)
-{
- int num;
- unsigned int u, n;
- struct hlist_head *head;
- struct au_vdir_wh *tpos;
- struct hlist_node *pos;
-
- num = 0;
- n = whlist->nh_num;
- head = whlist->nh_head;
- for (u = 0; u < n; u++, head++)
- hlist_for_each_entry(tpos, pos, head, wh_hash)
- if (tpos->wh_bindex == btgt && ++num > limit)
- return 1;
- return 0;
-}
-
-static struct hlist_head *au_name_hash(struct au_nhash *nhash,
- unsigned char *name,
- unsigned int len)
-{
- unsigned int v;
- /* const unsigned int magic_bit = 12; */
-
- AuDebugOn(!nhash->nh_num || !nhash->nh_head);
-
- v = 0;
- while (len--)
- v += *name++;
- /* v = hash_long(v, magic_bit); */
- v %= nhash->nh_num;
- return nhash->nh_head + v;
-}
-
-static int au_nhash_test_name(struct au_vdir_destr *str, const char *name,
- int nlen)
-{
- return str->len == nlen && !memcmp(str->name, name, nlen);
-}
-
-/* returns found or not */
-int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen)
-{
- struct hlist_head *head;
- struct au_vdir_wh *tpos;
- struct hlist_node *pos;
- struct au_vdir_destr *str;
-
- head = au_name_hash(whlist, name, nlen);
- hlist_for_each_entry(tpos, pos, head, wh_hash) {
- str = &tpos->wh_str;
- AuDbg("%.*s\n", str->len, str->name);
- if (au_nhash_test_name(str, name, nlen))
- return 1;
- }
- return 0;
-}
-
-/* returns found(true) or not */
-static int test_known(struct au_nhash *delist, char *name, int nlen)
-{
- struct hlist_head *head;
- struct au_vdir_dehstr *tpos;
- struct hlist_node *pos;
- struct au_vdir_destr *str;
-
- head = au_name_hash(delist, name, nlen);
- hlist_for_each_entry(tpos, pos, head, hash) {
- str = tpos->str;
- AuDbg("%.*s\n", str->len, str->name);
- if (au_nhash_test_name(str, name, nlen))
- return 1;
- }
- return 0;
-}
-
-static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino,
- unsigned char d_type)
-{
-#ifdef CONFIG_AUFS_SHWH
- wh->wh_ino = ino;
- wh->wh_type = d_type;
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
- unsigned int d_type, aufs_bindex_t bindex,
- unsigned char shwh)
-{
- int err;
- struct au_vdir_destr *str;
- struct au_vdir_wh *wh;
-
- AuDbg("%.*s\n", nlen, name);
- AuDebugOn(!whlist->nh_num || !whlist->nh_head);
-
- err = -ENOMEM;
- wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS);
- if (unlikely(!wh))
- goto out;
-
- err = 0;
- wh->wh_bindex = bindex;
- if (shwh)
- au_shwh_init_wh(wh, ino, d_type);
- str = &wh->wh_str;
- str->len = nlen;
- memcpy(str->name, name, nlen);
- hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen));
- /* smp_mb(); */
-
- out:
- return err;
-}
-
-static int append_deblk(struct au_vdir *vdir)
-{
- int err;
- unsigned long ul;
- const unsigned int deblk_sz = vdir->vd_deblk_sz;
- union au_vdir_deblk_p p, deblk_end;
- unsigned char **o;
-
- err = -ENOMEM;
- o = krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1),
- GFP_NOFS);
- if (unlikely(!o))
- goto out;
-
- vdir->vd_deblk = o;
- p.deblk = kmalloc(deblk_sz, GFP_NOFS);
- if (p.deblk) {
- ul = vdir->vd_nblk++;
- vdir->vd_deblk[ul] = p.deblk;
- vdir->vd_last.ul = ul;
- vdir->vd_last.p.deblk = p.deblk;
- deblk_end.deblk = p.deblk + deblk_sz;
- err = set_deblk_end(&p, &deblk_end);
- }
-
- out:
- return err;
-}
-
-static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino,
- unsigned int d_type, struct au_nhash *delist)
-{
- int err;
- unsigned int sz;
- const unsigned int deblk_sz = vdir->vd_deblk_sz;
- union au_vdir_deblk_p p, *room, deblk_end;
- struct au_vdir_dehstr *dehstr;
-
- p.deblk = last_deblk(vdir);
- deblk_end.deblk = p.deblk + deblk_sz;
- room = &vdir->vd_last.p;
- AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk
- || !is_deblk_end(room, &deblk_end));
-
- sz = calc_size(nlen);
- if (unlikely(sz > deblk_end.deblk - room->deblk)) {
- err = append_deblk(vdir);
- if (unlikely(err))
- goto out;
-
- p.deblk = last_deblk(vdir);
- deblk_end.deblk = p.deblk + deblk_sz;
- /* smp_mb(); */
- AuDebugOn(room->deblk != p.deblk);
- }
-
- err = -ENOMEM;
- dehstr = au_cache_alloc_vdir_dehstr();
- if (unlikely(!dehstr))
- goto out;
-
- dehstr->str = &room->de->de_str;
- hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen));
- room->de->de_ino = ino;
- room->de->de_type = d_type;
- room->de->de_str.len = nlen;
- memcpy(room->de->de_str.name, name, nlen);
-
- err = 0;
- room->deblk += sz;
- if (unlikely(set_deblk_end(room, &deblk_end)))
- err = append_deblk(vdir);
- /* smp_mb(); */
-
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_vdir_free(struct au_vdir *vdir)
-{
- unsigned char **deblk;
-
- deblk = vdir->vd_deblk;
- while (vdir->vd_nblk--)
- kfree(*deblk++);
- kfree(vdir->vd_deblk);
- au_cache_free_vdir(vdir);
-}
-
-static struct au_vdir *alloc_vdir(struct file *file)
-{
- struct au_vdir *vdir;
- struct super_block *sb;
- int err;
-
- sb = file->f_dentry->d_sb;
- SiMustAnyLock(sb);
-
- err = -ENOMEM;
- vdir = au_cache_alloc_vdir();
- if (unlikely(!vdir))
- goto out;
-
- vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS);
- if (unlikely(!vdir->vd_deblk))
- goto out_free;
-
- vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk;
- if (!vdir->vd_deblk_sz) {
- /* estimate the apropriate size for deblk */
- vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL);
- /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */
- }
- vdir->vd_nblk = 0;
- vdir->vd_version = 0;
- vdir->vd_jiffy = 0;
- err = append_deblk(vdir);
- if (!err)
- return vdir; /* success */
-
- kfree(vdir->vd_deblk);
-
- out_free:
- au_cache_free_vdir(vdir);
- out:
- vdir = ERR_PTR(err);
- return vdir;
-}
-
-static int reinit_vdir(struct au_vdir *vdir)
-{
- int err;
- union au_vdir_deblk_p p, deblk_end;
-
- while (vdir->vd_nblk > 1) {
- kfree(vdir->vd_deblk[vdir->vd_nblk - 1]);
- /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */
- vdir->vd_nblk--;
- }
- p.deblk = vdir->vd_deblk[0];
- deblk_end.deblk = p.deblk + vdir->vd_deblk_sz;
- err = set_deblk_end(&p, &deblk_end);
- /* keep vd_dblk_sz */
- vdir->vd_last.ul = 0;
- vdir->vd_last.p.deblk = vdir->vd_deblk[0];
- vdir->vd_version = 0;
- vdir->vd_jiffy = 0;
- /* smp_mb(); */
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define AuFillVdir_CALLED 1
-#define AuFillVdir_WHABLE (1 << 1)
-#define AuFillVdir_SHWH (1 << 2)
-#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name)
-#define au_fset_fillvdir(flags, name) { (flags) |= AuFillVdir_##name; }
-#define au_fclr_fillvdir(flags, name) { (flags) &= ~AuFillVdir_##name; }
-
-#ifndef CONFIG_AUFS_SHWH
-#undef AuFillVdir_SHWH
-#define AuFillVdir_SHWH 0
-#endif
-
-struct fillvdir_arg {
- struct file *file;
- struct au_vdir *vdir;
- struct au_nhash delist;
- struct au_nhash whlist;
- aufs_bindex_t bindex;
- unsigned int flags;
- int err;
-};
-
-static int fillvdir(void *__arg, const char *__name, int nlen,
- loff_t offset __maybe_unused, u64 h_ino,
- unsigned int d_type)
-{
- struct fillvdir_arg *arg = __arg;
- char *name = (void *)__name;
- struct super_block *sb;
- ino_t ino;
- const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH);
-
- arg->err = 0;
- sb = arg->file->f_dentry->d_sb;
- au_fset_fillvdir(arg->flags, CALLED);
- /* smp_mb(); */
- if (nlen <= AUFS_WH_PFX_LEN
- || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
- if (test_known(&arg->delist, name, nlen)
- || au_nhash_test_known_wh(&arg->whlist, name, nlen))
- goto out; /* already exists or whiteouted */
-
- sb = arg->file->f_dentry->d_sb;
- arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino);
- if (!arg->err) {
- if (unlikely(nlen > AUFS_MAX_NAMELEN))
- d_type = DT_UNKNOWN;
- arg->err = append_de(arg->vdir, name, nlen, ino,
- d_type, &arg->delist);
- }
- } else if (au_ftest_fillvdir(arg->flags, WHABLE)) {
- name += AUFS_WH_PFX_LEN;
- nlen -= AUFS_WH_PFX_LEN;
- if (au_nhash_test_known_wh(&arg->whlist, name, nlen))
- goto out; /* already whiteouted */
-
- if (shwh)
- arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type,
- &ino);
- if (!arg->err) {
- if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN)
- d_type = DT_UNKNOWN;
- arg->err = au_nhash_append_wh
- (&arg->whlist, name, nlen, ino, d_type,
- arg->bindex, shwh);
- }
- }
-
- out:
- if (!arg->err)
- arg->vdir->vd_jiffy = jiffies;
- /* smp_mb(); */
- AuTraceErr(arg->err);
- return arg->err;
-}
-
-static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir,
- struct au_nhash *whlist, struct au_nhash *delist)
-{
-#ifdef CONFIG_AUFS_SHWH
- int err;
- unsigned int nh, u;
- struct hlist_head *head;
- struct au_vdir_wh *tpos;
- struct hlist_node *pos, *n;
- char *p, *o;
- struct au_vdir_destr *destr;
-
- AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH));
-
- err = -ENOMEM;
- o = p = __getname_gfp(GFP_NOFS);
- if (unlikely(!p))
- goto out;
-
- err = 0;
- nh = whlist->nh_num;
- memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
- p += AUFS_WH_PFX_LEN;
- for (u = 0; u < nh; u++) {
- head = whlist->nh_head + u;
- hlist_for_each_entry_safe(tpos, pos, n, head, wh_hash) {
- destr = &tpos->wh_str;
- memcpy(p, destr->name, destr->len);
- err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN,
- tpos->wh_ino, tpos->wh_type, delist);
- if (unlikely(err))
- break;
- }
- }
-
- __putname(o);
-
- out:
- AuTraceErr(err);
- return err;
-#else
- return 0;
-#endif
-}
-
-static int au_do_read_vdir(struct fillvdir_arg *arg)
-{
- int err;
- unsigned int rdhash;
- loff_t offset;
- aufs_bindex_t bend, bindex, bstart;
- unsigned char shwh;
- struct file *hf, *file;
- struct super_block *sb;
-
- file = arg->file;
- sb = file->f_dentry->d_sb;
- SiMustAnyLock(sb);
-
- rdhash = au_sbi(sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL));
- err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out_delist;
-
- err = 0;
- arg->flags = 0;
- shwh = 0;
- if (au_opt_test(au_mntflags(sb), SHWH)) {
- shwh = 1;
- au_fset_fillvdir(arg->flags, SHWH);
- }
- bstart = au_fbstart(file);
- bend = au_fbend_dir(file);
- for (bindex = bstart; !err && bindex <= bend; bindex++) {
- hf = au_hf_dir(file, bindex);
- if (!hf)
- continue;
-
- offset = vfsub_llseek(hf, 0, SEEK_SET);
- err = offset;
- if (unlikely(offset))
- break;
-
- arg->bindex = bindex;
- au_fclr_fillvdir(arg->flags, WHABLE);
- if (shwh
- || (bindex != bend
- && au_br_whable(au_sbr_perm(sb, bindex))))
- au_fset_fillvdir(arg->flags, WHABLE);
- do {
- arg->err = 0;
- au_fclr_fillvdir(arg->flags, CALLED);
- /* smp_mb(); */
- err = vfsub_readdir(hf, fillvdir, arg);
- if (err >= 0)
- err = arg->err;
- } while (!err && au_ftest_fillvdir(arg->flags, CALLED));
- }
-
- if (!err && shwh)
- err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist);
-
- au_nhash_wh_free(&arg->whlist);
-
- out_delist:
- au_nhash_de_free(&arg->delist);
- out:
- return err;
-}
-
-static int read_vdir(struct file *file, int may_read)
-{
- int err;
- unsigned long expire;
- unsigned char do_read;
- struct fillvdir_arg arg;
- struct inode *inode;
- struct au_vdir *vdir, *allocated;
-
- err = 0;
- inode = file->f_dentry->d_inode;
- IMustLock(inode);
- SiMustAnyLock(inode->i_sb);
-
- allocated = NULL;
- do_read = 0;
- expire = au_sbi(inode->i_sb)->si_rdcache;
- vdir = au_ivdir(inode);
- if (!vdir) {
- do_read = 1;
- vdir = alloc_vdir(file);
- err = PTR_ERR(vdir);
- if (IS_ERR(vdir))
- goto out;
- err = 0;
- allocated = vdir;
- } else if (may_read
- && (inode->i_version != vdir->vd_version
- || time_after(jiffies, vdir->vd_jiffy + expire))) {
- do_read = 1;
- err = reinit_vdir(vdir);
- if (unlikely(err))
- goto out;
- }
-
- if (!do_read)
- return 0; /* success */
-
- arg.file = file;
- arg.vdir = vdir;
- err = au_do_read_vdir(&arg);
- if (!err) {
- /* file->f_pos = 0; */
- vdir->vd_version = inode->i_version;
- vdir->vd_last.ul = 0;
- vdir->vd_last.p.deblk = vdir->vd_deblk[0];
- if (allocated)
- au_set_ivdir(inode, allocated);
- } else if (allocated)
- au_vdir_free(allocated);
-
- out:
- return err;
-}
-
-static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src)
-{
- int err, rerr;
- unsigned long ul, n;
- const unsigned int deblk_sz = src->vd_deblk_sz;
-
- AuDebugOn(tgt->vd_nblk != 1);
-
- err = -ENOMEM;
- if (tgt->vd_nblk < src->vd_nblk) {
- unsigned char **p;
-
- p = krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk,
- GFP_NOFS);
- if (unlikely(!p))
- goto out;
- tgt->vd_deblk = p;
- }
-
- if (tgt->vd_deblk_sz != deblk_sz) {
- unsigned char *p;
-
- tgt->vd_deblk_sz = deblk_sz;
- p = krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS);
- if (unlikely(!p))
- goto out;
- tgt->vd_deblk[0] = p;
- }
- memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz);
- tgt->vd_version = src->vd_version;
- tgt->vd_jiffy = src->vd_jiffy;
-
- n = src->vd_nblk;
- for (ul = 1; ul < n; ul++) {
- tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz,
- GFP_NOFS);
- if (unlikely(!tgt->vd_deblk[ul]))
- goto out;
- tgt->vd_nblk++;
- }
- tgt->vd_nblk = n;
- tgt->vd_last.ul = tgt->vd_last.ul;
- tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul];
- tgt->vd_last.p.deblk += src->vd_last.p.deblk
- - src->vd_deblk[src->vd_last.ul];
- /* smp_mb(); */
- return 0; /* success */
-
- out:
- rerr = reinit_vdir(tgt);
- BUG_ON(rerr);
- return err;
-}
-
-int au_vdir_init(struct file *file)
-{
- int err;
- struct inode *inode;
- struct au_vdir *vdir_cache, *allocated;
-
- err = read_vdir(file, !file->f_pos);
- if (unlikely(err))
- goto out;
-
- allocated = NULL;
- vdir_cache = au_fvdir_cache(file);
- if (!vdir_cache) {
- vdir_cache = alloc_vdir(file);
- err = PTR_ERR(vdir_cache);
- if (IS_ERR(vdir_cache))
- goto out;
- allocated = vdir_cache;
- } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) {
- err = reinit_vdir(vdir_cache);
- if (unlikely(err))
- goto out;
- } else
- return 0; /* success */
-
- inode = file->f_dentry->d_inode;
- err = copy_vdir(vdir_cache, au_ivdir(inode));
- if (!err) {
- file->f_version = inode->i_version;
- if (allocated)
- au_set_fvdir_cache(file, allocated);
- } else if (allocated)
- au_vdir_free(allocated);
-
- out:
- return err;
-}
-
-static loff_t calc_offset(struct au_vdir *vdir)
-{
- loff_t offset;
- union au_vdir_deblk_p p;
-
- p.deblk = vdir->vd_deblk[vdir->vd_last.ul];
- offset = vdir->vd_last.p.deblk - p.deblk;
- offset += vdir->vd_deblk_sz * vdir->vd_last.ul;
- return offset;
-}
-
-/* returns true or false */
-static int seek_vdir(struct file *file)
-{
- int valid;
- unsigned int deblk_sz;
- unsigned long ul, n;
- loff_t offset;
- union au_vdir_deblk_p p, deblk_end;
- struct au_vdir *vdir_cache;
-
- valid = 1;
- vdir_cache = au_fvdir_cache(file);
- offset = calc_offset(vdir_cache);
- AuDbg("offset %lld\n", offset);
- if (file->f_pos == offset)
- goto out;
-
- vdir_cache->vd_last.ul = 0;
- vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0];
- if (!file->f_pos)
- goto out;
-
- valid = 0;
- deblk_sz = vdir_cache->vd_deblk_sz;
- ul = div64_u64(file->f_pos, deblk_sz);
- AuDbg("ul %lu\n", ul);
- if (ul >= vdir_cache->vd_nblk)
- goto out;
-
- n = vdir_cache->vd_nblk;
- for (; ul < n; ul++) {
- p.deblk = vdir_cache->vd_deblk[ul];
- deblk_end.deblk = p.deblk + deblk_sz;
- offset = ul;
- offset *= deblk_sz;
- while (!is_deblk_end(&p, &deblk_end) && offset < file->f_pos) {
- unsigned int l;
-
- l = calc_size(p.de->de_str.len);
- offset += l;
- p.deblk += l;
- }
- if (!is_deblk_end(&p, &deblk_end)) {
- valid = 1;
- vdir_cache->vd_last.ul = ul;
- vdir_cache->vd_last.p = p;
- break;
- }
- }
-
- out:
- /* smp_mb(); */
- AuTraceErr(!valid);
- return valid;
-}
-
-int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir)
-{
- int err;
- unsigned int l, deblk_sz;
- union au_vdir_deblk_p deblk_end;
- struct au_vdir *vdir_cache;
- struct au_vdir_de *de;
-
- vdir_cache = au_fvdir_cache(file);
- if (!seek_vdir(file))
- return 0;
-
- deblk_sz = vdir_cache->vd_deblk_sz;
- while (1) {
- deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
- deblk_end.deblk += deblk_sz;
- while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) {
- de = vdir_cache->vd_last.p.de;
- AuDbg("%.*s, off%lld, i%lu, dt%d\n",
- de->de_str.len, de->de_str.name, file->f_pos,
- (unsigned long)de->de_ino, de->de_type);
- err = filldir(dirent, de->de_str.name, de->de_str.len,
- file->f_pos, de->de_ino, de->de_type);
- if (unlikely(err)) {
- AuTraceErr(err);
- /* todo: ignore the error caused by udba? */
- /* return err; */
- return 0;
- }
-
- l = calc_size(de->de_str.len);
- vdir_cache->vd_last.p.deblk += l;
- file->f_pos += l;
- }
- if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) {
- vdir_cache->vd_last.ul++;
- vdir_cache->vd_last.p.deblk
- = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
- file->f_pos = deblk_sz * vdir_cache->vd_last.ul;
- continue;
- }
- break;
- }
-
- /* smp_mb(); */
- return 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sub-routines for VFS
- */
-
-#include <linux/file.h>
-#include <linux/ima.h>
-#include <linux/namei.h>
-#include <linux/security.h>
-#include <linux/splice.h>
-#include <linux/uaccess.h>
-#include "aufs.h"
-
-int vfsub_update_h_iattr(struct path *h_path, int *did)
-{
- int err;
- struct kstat st;
- struct super_block *h_sb;
-
- /* for remote fs, leave work for its getattr or d_revalidate */
- /* for bad i_attr fs, handle them in aufs_getattr() */
- /* still some fs may acquire i_mutex. we need to skip them */
- err = 0;
- if (!did)
- did = &err;
- h_sb = h_path->dentry->d_sb;
- *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
- if (*did)
- err = vfs_getattr(h_path->mnt, h_path->dentry, &st);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_conv_oflags(int flags)
-{
- int mask = 0;
-
-#ifdef CONFIG_IMA
- fmode_t fmode;
-
- /* mask = MAY_OPEN; */
- fmode = OPEN_FMODE(flags);
- if (fmode & FMODE_READ)
- mask |= MAY_READ;
- if ((fmode & FMODE_WRITE)
- || (flags & O_TRUNC))
- mask |= MAY_WRITE;
- /*
- * if (flags & O_APPEND)
- * mask |= MAY_APPEND;
- */
- if (flags & vfsub_fmode_to_uint(FMODE_EXEC))
- mask |= MAY_EXEC;
-
- AuDbg("flags 0x%x, mask 0x%x\n", flags, mask);
-#endif
-
- return mask;
-}
-
-struct file *vfsub_dentry_open(struct path *path, int flags)
-{
- struct file *file;
- int err;
-
- path_get(path);
- file = dentry_open(path->dentry, path->mnt, flags, current_cred());
- if (IS_ERR(file))
- goto out;
-
- err = ima_file_check(file, au_conv_oflags(flags));
- if (unlikely(err)) {
- fput(file);
- file = ERR_PTR(err);
- }
-out:
- return file;
-}
-
-struct file *vfsub_filp_open(const char *path, int oflags, int mode)
-{
- struct file *file;
-
- /* lockdep_off(); */
- file = filp_open(path, oflags, mode);
- /* lockdep_on(); */
- if (IS_ERR(file))
- goto out;
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-
- out:
- return file;
-}
-
-int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
-{
- int err;
-
- /* lockdep_off(); */
- err = kern_path(name, flags, path);
- /* lockdep_on(); */
- if (!err && path->dentry->d_inode)
- vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
- int len)
-{
- struct path path = {
- .mnt = NULL
- };
-
- /* VFS checks it too, but by WARN_ON_ONCE() */
- IMustLock(parent->d_inode);
-
- path.dentry = lookup_one_len(name, parent, len);
- if (IS_ERR(path.dentry))
- goto out;
- if (path.dentry->d_inode)
- vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
-
- out:
- AuTraceErrPtr(path.dentry);
- return path.dentry;
-}
-
-struct dentry *vfsub_lookup_hash(struct nameidata *nd)
-{
- struct path path = {
- .mnt = nd->path.mnt
- };
-
- IMustLock(nd->path.dentry->d_inode);
-
- path.dentry = lookup_hash(nd);
- if (IS_ERR(path.dentry))
- goto out;
- if (path.dentry->d_inode)
- vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
-
- out:
- AuTraceErrPtr(path.dentry);
- return path.dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2)
-{
- struct dentry *d;
-
- lockdep_off();
- d = lock_rename(d1, d2);
- lockdep_on();
- au_hn_suspend(hdir1);
- if (hdir1 != hdir2)
- au_hn_suspend(hdir2);
-
- return d;
-}
-
-void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2)
-{
- au_hn_resume(hdir1);
- if (hdir1 != hdir2)
- au_hn_resume(hdir2);
- lockdep_off();
- unlock_rename(d1, d2);
- lockdep_on();
-}
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_create(struct inode *dir, struct path *path, int mode)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_mknod(path, path->dentry, mode, 0);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- if (au_test_fs_null_nd(dir->i_sb))
- err = vfs_create(dir, path->dentry, mode, NULL);
- else {
- struct nameidata h_nd;
-
- memset(&h_nd, 0, sizeof(h_nd));
- h_nd.flags = LOOKUP_CREATE;
- h_nd.intent.open.flags = O_CREAT
- | vfsub_fmode_to_uint(FMODE_READ);
- h_nd.intent.open.create_mode = mode;
- h_nd.path.dentry = path->dentry->d_parent;
- h_nd.path.mnt = path->mnt;
- path_get(&h_nd.path);
- err = vfs_create(dir, path->dentry, mode, &h_nd);
- path_put(&h_nd.path);
- }
-
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
- out:
- return err;
-}
-
-int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_symlink(path, path->dentry, symname);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- err = vfs_symlink(dir, path->dentry, symname);
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
- out:
- return err;
-}
-
-int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_mknod(path, path->dentry, mode, dev);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- err = vfs_mknod(dir, path->dentry, mode, dev);
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
- out:
- return err;
-}
-
-static int au_test_nlink(struct inode *inode)
-{
- const unsigned int link_max = UINT_MAX >> 1; /* rough margin */
-
- if (!au_test_fs_no_limit_nlink(inode->i_sb)
- || inode->i_nlink < link_max)
- return 0;
- return -EMLINK;
-}
-
-int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- err = au_test_nlink(src_dentry->d_inode);
- if (unlikely(err))
- return err;
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_link(src_dentry, path, path->dentry);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- /* lockdep_off(); */
- err = vfs_link(src_dentry, dir, path->dentry);
- /* lockdep_on(); */
- if (!err) {
- struct path tmp = *path;
- int did;
-
- /* fuse has different memory inode for the same inumber */
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- tmp.dentry = src_dentry;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
- out:
- return err;
-}
-
-int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
- struct inode *dir, struct path *path)
-{
- int err;
- struct path tmp = {
- .mnt = path->mnt
- };
- struct dentry *d;
-
- IMustLock(dir);
- IMustLock(src_dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- tmp.dentry = src_dentry->d_parent;
- err = security_path_rename(&tmp, src_dentry, path, path->dentry);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- /* lockdep_off(); */
- err = vfs_rename(src_dir, src_dentry, dir, path->dentry);
- /* lockdep_on(); */
- if (!err) {
- int did;
-
- tmp.dentry = d->d_parent;
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = src_dentry;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- tmp.dentry = src_dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
- out:
- return err;
-}
-
-int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_mkdir(path, path->dentry, mode);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- err = vfs_mkdir(dir, path->dentry, mode);
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
- out:
- return err;
-}
-
-int vfsub_rmdir(struct inode *dir, struct path *path)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_rmdir(path, path->dentry);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- /* lockdep_off(); */
- err = vfs_rmdir(dir, path->dentry);
- /* lockdep_on(); */
- if (!err) {
- struct path tmp = {
- .dentry = path->dentry->d_parent,
- .mnt = path->mnt
- };
-
- vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
- }
-
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
-
- err = vfs_read(file, ubuf, count, ppos);
- if (err >= 0)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-/* todo: kernel_read()? */
-ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
- mm_segment_t oldfs;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = vfsub_read_u(file, (char __user *)kbuf, count, ppos);
- set_fs(oldfs);
- return err;
-}
-
-ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
-
- /* lockdep_off(); */
- err = vfs_write(file, ubuf, count, ppos);
- /* lockdep_on(); */
- if (err >= 0)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
-{
- ssize_t err;
- mm_segment_t oldfs;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = vfsub_write_u(file, (const char __user *)kbuf, count, ppos);
- set_fs(oldfs);
- return err;
-}
-
-int vfsub_flush(struct file *file, fl_owner_t id)
-{
- int err;
-
- err = 0;
- if (file->f_op && file->f_op->flush) {
- err = file->f_op->flush(file, id);
- if (!err)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL);
- /*ignore*/
- }
- return err;
-}
-
-int vfsub_readdir(struct file *file, filldir_t filldir, void *arg)
-{
- int err;
-
- /* lockdep_off(); */
- err = vfs_readdir(file, filldir, arg);
- /* lockdep_on(); */
- if (err >= 0)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-long vfsub_splice_to(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
-{
- long err;
-
- /* lockdep_off(); */
- err = do_splice_to(in, ppos, pipe, len, flags);
- /* lockdep_on(); */
- file_accessed(in);
- if (err >= 0)
- vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
- loff_t *ppos, size_t len, unsigned int flags)
-{
- long err;
-
- /* lockdep_off(); */
- err = do_splice_from(pipe, out, ppos, len, flags);
- /* lockdep_on(); */
- if (err >= 0)
- vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
-int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
- struct file *h_file)
-{
- int err;
- struct inode *h_inode;
-
- h_inode = h_path->dentry->d_inode;
- if (!h_file) {
- err = mnt_want_write(h_path->mnt);
- if (err)
- goto out;
- err = inode_permission(h_inode, MAY_WRITE);
- if (err)
- goto out_mnt;
- err = get_write_access(h_inode);
- if (err)
- goto out_mnt;
- err = break_lease(h_inode, O_WRONLY);
- if (err)
- goto out_inode;
- }
-
- err = locks_verify_truncate(h_inode, h_file, length);
- if (!err)
- err = security_path_truncate(h_path, length, attr);
- if (!err) {
- /* lockdep_off(); */
- err = do_truncate(h_path->dentry, length, attr, h_file);
- /* lockdep_on(); */
- }
-
- out_inode:
- if (!h_file)
- put_write_access(h_inode);
- out_mnt:
- if (!h_file)
- mnt_drop_write(h_path->mnt);
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_vfsub_mkdir_args {
- int *errp;
- struct inode *dir;
- struct path *path;
- int mode;
-};
-
-static void au_call_vfsub_mkdir(void *args)
-{
- struct au_vfsub_mkdir_args *a = args;
- *a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
-}
-
-int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
-{
- int err, do_sio, wkq_err;
-
- do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
- if (!do_sio)
- err = vfsub_mkdir(dir, path, mode);
- else {
- struct au_vfsub_mkdir_args args = {
- .errp = &err,
- .dir = dir,
- .path = path,
- .mode = mode
- };
- wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
-
-struct au_vfsub_rmdir_args {
- int *errp;
- struct inode *dir;
- struct path *path;
-};
-
-static void au_call_vfsub_rmdir(void *args)
-{
- struct au_vfsub_rmdir_args *a = args;
- *a->errp = vfsub_rmdir(a->dir, a->path);
-}
-
-int vfsub_sio_rmdir(struct inode *dir, struct path *path)
-{
- int err, do_sio, wkq_err;
-
- do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
- if (!do_sio)
- err = vfsub_rmdir(dir, path);
- else {
- struct au_vfsub_rmdir_args args = {
- .errp = &err,
- .dir = dir,
- .path = path
- };
- wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct notify_change_args {
- int *errp;
- struct path *path;
- struct iattr *ia;
-};
-
-static void call_notify_change(void *args)
-{
- struct notify_change_args *a = args;
- struct inode *h_inode;
-
- h_inode = a->path->dentry->d_inode;
- IMustLock(h_inode);
-
- *a->errp = -EPERM;
- if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
- /* lockdep_off(); */
- *a->errp = notify_change(a->path->dentry, a->ia);
- /* lockdep_on(); */
- if (!*a->errp)
- vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
- }
- AuTraceErr(*a->errp);
-}
-
-int vfsub_notify_change(struct path *path, struct iattr *ia)
-{
- int err;
- struct notify_change_args args = {
- .errp = &err,
- .path = path,
- .ia = ia
- };
-
- call_notify_change(&args);
-
- return err;
-}
-
-int vfsub_sio_notify_change(struct path *path, struct iattr *ia)
-{
- int err, wkq_err;
- struct notify_change_args args = {
- .errp = &err,
- .path = path,
- .ia = ia
- };
-
- wkq_err = au_wkq_wait(call_notify_change, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct unlink_args {
- int *errp;
- struct inode *dir;
- struct path *path;
-};
-
-static void call_unlink(void *args)
-{
- struct unlink_args *a = args;
- struct dentry *d = a->path->dentry;
- struct inode *h_inode;
- const int stop_sillyrename = (au_test_nfs(d->d_sb)
- && atomic_read(&d->d_count) == 1);
-
- IMustLock(a->dir);
-
- a->path->dentry = d->d_parent;
- *a->errp = security_path_unlink(a->path, d);
- a->path->dentry = d;
- if (unlikely(*a->errp))
- return;
-
- if (!stop_sillyrename)
- dget(d);
- h_inode = d->d_inode;
- if (h_inode)
- atomic_inc(&h_inode->i_count);
-
- /* lockdep_off(); */
- *a->errp = vfs_unlink(a->dir, d);
- /* lockdep_on(); */
- if (!*a->errp) {
- struct path tmp = {
- .dentry = d->d_parent,
- .mnt = a->path->mnt
- };
- vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
- }
-
- if (!stop_sillyrename)
- dput(d);
- if (h_inode)
- iput(h_inode);
-
- AuTraceErr(*a->errp);
-}
-
-/*
- * @dir: must be locked.
- * @dentry: target dentry.
- */
-int vfsub_unlink(struct inode *dir, struct path *path, int force)
-{
- int err;
- struct unlink_args args = {
- .errp = &err,
- .dir = dir,
- .path = path
- };
-
- if (!force)
- call_unlink(&args);
- else {
- int wkq_err;
-
- wkq_err = au_wkq_wait(call_unlink, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * sub-routines for VFS
- */
-
-#ifndef __AUFS_VFSUB_H__
-#define __AUFS_VFSUB_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-
-/* ---------------------------------------------------------------------- */
-
-/* lock subclass for lower inode */
-/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
-/* reduce? gave up. */
-enum {
- AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */
- AuLsc_I_PARENT, /* lower inode, parent first */
- AuLsc_I_PARENT2, /* copyup dirs */
- AuLsc_I_PARENT3, /* copyup wh */
- AuLsc_I_CHILD,
- AuLsc_I_CHILD2,
- AuLsc_I_End
-};
-
-/* to debug easier, do not make them inlined functions */
-#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx))
-#define IMustLock(i) MtxMustLock(&(i)->i_mutex)
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_update_h_iattr(struct path *h_path, int *did);
-struct file *vfsub_dentry_open(struct path *path, int flags);
-struct file *vfsub_filp_open(const char *path, int oflags, int mode);
-int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
-struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
- int len);
-struct dentry *vfsub_lookup_hash(struct nameidata *nd);
-
-/* ---------------------------------------------------------------------- */
-
-struct au_hinode;
-struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2);
-void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2);
-
-int vfsub_create(struct inode *dir, struct path *path, int mode);
-int vfsub_symlink(struct inode *dir, struct path *path,
- const char *symname);
-int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
-int vfsub_link(struct dentry *src_dentry, struct inode *dir,
- struct path *path);
-int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
- struct inode *hdir, struct path *path);
-int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
-int vfsub_rmdir(struct inode *dir, struct path *path);
-
-/* ---------------------------------------------------------------------- */
-
-ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
- loff_t *ppos);
-ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
- loff_t *ppos);
-ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
- loff_t *ppos);
-ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
- loff_t *ppos);
-int vfsub_flush(struct file *file, fl_owner_t id);
-int vfsub_readdir(struct file *file, filldir_t filldir, void *arg);
-
-static inline unsigned int vfsub_file_flags(struct file *file)
-{
- unsigned int flags;
-
- spin_lock(&file->f_lock);
- flags = file->f_flags;
- spin_unlock(&file->f_lock);
-
- return flags;
-}
-
-static inline void vfsub_file_accessed(struct file *h_file)
-{
- file_accessed(h_file);
- vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
-}
-
-static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
- struct dentry *h_dentry)
-{
- struct path h_path = {
- .dentry = h_dentry,
- .mnt = h_mnt
- };
- touch_atime(h_mnt, h_dentry);
- vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
-}
-
-long vfsub_splice_to(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags);
-long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
- loff_t *ppos, size_t len, unsigned int flags);
-int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
- struct file *h_file);
-
-/* ---------------------------------------------------------------------- */
-
-static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
-{
- loff_t err;
-
- /* lockdep_off(); */
- err = vfs_llseek(file, offset, origin);
- /* lockdep_on(); */
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* dirty workaround for strict type of fmode_t */
-union vfsub_fmu {
- fmode_t fm;
- unsigned int ui;
-};
-
-static inline unsigned int vfsub_fmode_to_uint(fmode_t fm)
-{
- union vfsub_fmu u = {
- .fm = fm
- };
-
- BUILD_BUG_ON(sizeof(u.fm) != sizeof(u.ui));
-
- return u.ui;
-}
-
-static inline fmode_t vfsub_uint_to_fmode(unsigned int ui)
-{
- union vfsub_fmu u = {
- .ui = ui
- };
-
- return u.fm;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
-int vfsub_sio_rmdir(struct inode *dir, struct path *path);
-int vfsub_sio_notify_change(struct path *path, struct iattr *ia);
-int vfsub_notify_change(struct path *path, struct iattr *ia);
-int vfsub_unlink(struct inode *dir, struct path *path, int force);
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_VFSUB_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * policies for selecting one among multiple writable branches
- */
-
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/* subset of cpup_attr() */
-static noinline_for_stack
-int au_cpdown_attr(struct path *h_path, struct dentry *h_src)
-{
- int err, sbits;
- struct iattr ia;
- struct inode *h_isrc;
-
- h_isrc = h_src->d_inode;
- ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
- ia.ia_mode = h_isrc->i_mode;
- ia.ia_uid = h_isrc->i_uid;
- ia.ia_gid = h_isrc->i_gid;
- sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
- au_cpup_attr_flags(h_path->dentry->d_inode, h_isrc);
- err = vfsub_sio_notify_change(h_path, &ia);
-
- /* is this nfs only? */
- if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) {
- ia.ia_valid = ATTR_FORCE | ATTR_MODE;
- ia.ia_mode = h_isrc->i_mode;
- err = vfsub_sio_notify_change(h_path, &ia);
- }
-
- return err;
-}
-
-#define AuCpdown_PARENT_OPQ 1
-#define AuCpdown_WHED (1 << 1)
-#define AuCpdown_MADE_DIR (1 << 2)
-#define AuCpdown_DIROPQ (1 << 3)
-#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name)
-#define au_fset_cpdown(flags, name) { (flags) |= AuCpdown_##name; }
-#define au_fclr_cpdown(flags, name) { (flags) &= ~AuCpdown_##name; }
-
-struct au_cpdown_dir_args {
- struct dentry *parent;
- unsigned int flags;
-};
-
-static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst,
- struct au_cpdown_dir_args *a)
-{
- int err;
- struct dentry *opq_dentry;
-
- opq_dentry = au_diropq_create(dentry, bdst);
- err = PTR_ERR(opq_dentry);
- if (IS_ERR(opq_dentry))
- goto out;
- dput(opq_dentry);
- au_fset_cpdown(a->flags, DIROPQ);
-
- out:
- return err;
-}
-
-static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent,
- struct inode *dir, aufs_bindex_t bdst)
-{
- int err;
- struct path h_path;
- struct au_branch *br;
-
- br = au_sbr(dentry->d_sb, bdst);
- h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry))
- goto out;
-
- err = 0;
- if (h_path.dentry->d_inode) {
- h_path.mnt = br->br_mnt;
- err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path,
- dentry);
- }
- dput(h_path.dentry);
-
- out:
- return err;
-}
-
-static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
- struct dentry *h_parent, void *arg)
-{
- int err, rerr;
- aufs_bindex_t bopq, bstart;
- struct path h_path;
- struct dentry *parent;
- struct inode *h_dir, *h_inode, *inode, *dir;
- struct au_cpdown_dir_args *args = arg;
-
- bstart = au_dbstart(dentry);
- /* dentry is di-locked */
- parent = dget_parent(dentry);
- dir = parent->d_inode;
- h_dir = h_parent->d_inode;
- AuDebugOn(h_dir != au_h_iptr(dir, bdst));
- IMustLock(h_dir);
-
- err = au_lkup_neg(dentry, bdst);
- if (unlikely(err < 0))
- goto out;
- h_path.dentry = au_h_dptr(dentry, bdst);
- h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst);
- err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path,
- S_IRWXU | S_IRUGO | S_IXUGO);
- if (unlikely(err))
- goto out_put;
- au_fset_cpdown(args->flags, MADE_DIR);
-
- bopq = au_dbdiropq(dentry);
- au_fclr_cpdown(args->flags, WHED);
- au_fclr_cpdown(args->flags, DIROPQ);
- if (au_dbwh(dentry) == bdst)
- au_fset_cpdown(args->flags, WHED);
- if (!au_ftest_cpdown(args->flags, PARENT_OPQ) && bopq <= bdst)
- au_fset_cpdown(args->flags, PARENT_OPQ);
- h_inode = h_path.dentry->d_inode;
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- if (au_ftest_cpdown(args->flags, WHED)) {
- err = au_cpdown_dir_opq(dentry, bdst, args);
- if (unlikely(err)) {
- mutex_unlock(&h_inode->i_mutex);
- goto out_dir;
- }
- }
-
- err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart));
- mutex_unlock(&h_inode->i_mutex);
- if (unlikely(err))
- goto out_opq;
-
- if (au_ftest_cpdown(args->flags, WHED)) {
- err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
- if (unlikely(err))
- goto out_opq;
- }
-
- inode = dentry->d_inode;
- if (au_ibend(inode) < bdst)
- au_set_ibend(inode, bdst);
- au_set_h_iptr(inode, bdst, au_igrab(h_inode),
- au_hi_flags(inode, /*isdir*/1));
- goto out; /* success */
-
- /* revert */
- out_opq:
- if (au_ftest_cpdown(args->flags, DIROPQ)) {
- mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
- rerr = au_diropq_remove(dentry, bdst);
- mutex_unlock(&h_inode->i_mutex);
- if (unlikely(rerr)) {
- AuIOErr("failed removing diropq for %.*s b%d (%d)\n",
- AuDLNPair(dentry), bdst, rerr);
- err = -EIO;
- goto out;
- }
- }
- out_dir:
- if (au_ftest_cpdown(args->flags, MADE_DIR)) {
- rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
- if (unlikely(rerr)) {
- AuIOErr("failed removing %.*s b%d (%d)\n",
- AuDLNPair(dentry), bdst, rerr);
- err = -EIO;
- }
- }
- out_put:
- au_set_h_dptr(dentry, bdst, NULL);
- if (au_dbend(dentry) == bdst)
- au_update_dbend(dentry);
- out:
- dput(parent);
- return err;
-}
-
-int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-{
- int err;
- struct au_cpdown_dir_args args = {
- .parent = dget_parent(dentry),
- .flags = 0
- };
-
- err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &args);
- dput(args.parent);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* policies for create */
-
-static int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex)
-{
- int err, i, j, ndentry;
- aufs_bindex_t bopq;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries, *parent, *d;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- parent = dget_parent(dentry);
- err = au_dcsub_pages_rev(&dpages, parent, /*do_include*/0, /*test*/NULL,
- /*arg*/NULL);
- if (unlikely(err))
- goto out_free;
-
- err = bindex;
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++) {
- d = dentries[j];
- di_read_lock_parent2(d, !AuLock_IR);
- bopq = au_dbdiropq(d);
- di_read_unlock(d, !AuLock_IR);
- if (bopq >= 0 && bopq < err)
- err = bopq;
- }
- }
-
-out_free:
- dput(parent);
- au_dpages_free(&dpages);
-out:
- return err;
-}
-
-static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
-{
- for (; bindex >= 0; bindex--)
- if (!au_br_rdonly(au_sbr(sb, bindex)))
- return bindex;
- return -EROFS;
-}
-
-/* top down parent */
-static int au_wbr_create_tdp(struct dentry *dentry, int isdir __maybe_unused)
-{
- int err;
- aufs_bindex_t bstart, bindex;
- struct super_block *sb;
- struct dentry *parent, *h_parent;
-
- sb = dentry->d_sb;
- bstart = au_dbstart(dentry);
- err = bstart;
- if (!au_br_rdonly(au_sbr(sb, bstart)))
- goto out;
-
- err = -EROFS;
- parent = dget_parent(dentry);
- for (bindex = au_dbstart(parent); bindex < bstart; bindex++) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || !h_parent->d_inode)
- continue;
-
- if (!au_br_rdonly(au_sbr(sb, bindex))) {
- err = bindex;
- break;
- }
- }
- dput(parent);
-
- /* bottom up here */
- if (unlikely(err < 0)) {
- err = au_wbr_bu(sb, bstart - 1);
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
- }
-
- out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* an exception for the policy other than tdp */
-static int au_wbr_create_exp(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bwh, bdiropq;
- struct dentry *parent;
-
- err = -1;
- bwh = au_dbwh(dentry);
- parent = dget_parent(dentry);
- bdiropq = au_dbdiropq(parent);
- if (bwh >= 0) {
- if (bdiropq >= 0)
- err = min(bdiropq, bwh);
- else
- err = bwh;
- AuDbg("%d\n", err);
- } else if (bdiropq >= 0) {
- err = bdiropq;
- AuDbg("%d\n", err);
- }
- dput(parent);
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
- if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
- err = -1;
-
- AuDbg("%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* round robin */
-static int au_wbr_create_init_rr(struct super_block *sb)
-{
- int err;
-
- err = au_wbr_bu(sb, au_sbend(sb));
- atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
- /* smp_mb(); */
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_create_rr(struct dentry *dentry, int isdir)
-{
- int err, nbr;
- unsigned int u;
- aufs_bindex_t bindex, bend;
- struct super_block *sb;
- atomic_t *next;
-
- err = au_wbr_create_exp(dentry);
- if (err >= 0)
- goto out;
-
- sb = dentry->d_sb;
- next = &au_sbi(sb)->si_wbr_rr_next;
- bend = au_sbend(sb);
- nbr = bend + 1;
- for (bindex = 0; bindex <= bend; bindex++) {
- if (!isdir) {
- err = atomic_dec_return(next) + 1;
- /* modulo for 0 is meaningless */
- if (unlikely(!err))
- err = atomic_dec_return(next) + 1;
- } else
- err = atomic_read(next);
- AuDbg("%d\n", err);
- u = err;
- err = u % nbr;
- AuDbg("%d\n", err);
- if (!au_br_rdonly(au_sbr(sb, err)))
- break;
- err = -EROFS;
- }
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
- out:
- AuDbg("%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* most free space */
-static void au_mfs(struct dentry *dentry)
-{
- struct super_block *sb;
- struct au_branch *br;
- struct au_wbr_mfs *mfs;
- aufs_bindex_t bindex, bend;
- int err;
- unsigned long long b, bavail;
- /* reduce the stack usage */
- struct kstatfs *st;
-
- st = kmalloc(sizeof(*st), GFP_NOFS);
- if (unlikely(!st)) {
- AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM);
- return;
- }
-
- bavail = 0;
- sb = dentry->d_sb;
- mfs = &au_sbi(sb)->si_wbr_mfs;
- MtxMustLock(&mfs->mfs_lock);
- mfs->mfs_bindex = -EROFS;
- mfs->mfsrr_bytes = 0;
- bend = au_sbend(sb);
- for (bindex = 0; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_rdonly(br))
- continue;
-
- /* sb->s_root for NFS is unreliable */
- err = vfs_statfs(br->br_mnt->mnt_root, st);
- if (unlikely(err)) {
- AuWarn1("failed statfs, b%d, %d\n", bindex, err);
- continue;
- }
-
- /* when the available size is equal, select the lower one */
- BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail)
- || sizeof(b) < sizeof(st->f_bsize));
- b = st->f_bavail * st->f_bsize;
- br->br_wbr->wbr_bytes = b;
- if (b >= bavail) {
- bavail = b;
- mfs->mfs_bindex = bindex;
- mfs->mfs_jiffy = jiffies;
- }
- }
-
- mfs->mfsrr_bytes = bavail;
- AuDbg("b%d\n", mfs->mfs_bindex);
- kfree(st);
-}
-
-static int au_wbr_create_mfs(struct dentry *dentry, int isdir __maybe_unused)
-{
- int err;
- struct super_block *sb;
- struct au_wbr_mfs *mfs;
-
- err = au_wbr_create_exp(dentry);
- if (err >= 0)
- goto out;
-
- sb = dentry->d_sb;
- mfs = &au_sbi(sb)->si_wbr_mfs;
- mutex_lock(&mfs->mfs_lock);
- if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
- || mfs->mfs_bindex < 0
- || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex)))
- au_mfs(dentry);
- mutex_unlock(&mfs->mfs_lock);
- err = mfs->mfs_bindex;
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
- out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_create_init_mfs(struct super_block *sb)
-{
- struct au_wbr_mfs *mfs;
-
- mfs = &au_sbi(sb)->si_wbr_mfs;
- mutex_init(&mfs->mfs_lock);
- mfs->mfs_jiffy = 0;
- mfs->mfs_bindex = -EROFS;
-
- return 0;
-}
-
-static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused)
-{
- mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* most free space and then round robin */
-static int au_wbr_create_mfsrr(struct dentry *dentry, int isdir)
-{
- int err;
- struct au_wbr_mfs *mfs;
-
- err = au_wbr_create_mfs(dentry, isdir);
- if (err >= 0) {
- mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
- mutex_lock(&mfs->mfs_lock);
- if (mfs->mfsrr_bytes < mfs->mfsrr_watermark)
- err = au_wbr_create_rr(dentry, isdir);
- mutex_unlock(&mfs->mfs_lock);
- }
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_create_init_mfsrr(struct super_block *sb)
-{
- int err;
-
- au_wbr_create_init_mfs(sb); /* ignore */
- err = au_wbr_create_init_rr(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* top down parent and most free space */
-static int au_wbr_create_pmfs(struct dentry *dentry, int isdir)
-{
- int err, e2;
- unsigned long long b;
- aufs_bindex_t bindex, bstart, bend;
- struct super_block *sb;
- struct dentry *parent, *h_parent;
- struct au_branch *br;
-
- err = au_wbr_create_tdp(dentry, isdir);
- if (unlikely(err < 0))
- goto out;
- parent = dget_parent(dentry);
- bstart = au_dbstart(parent);
- bend = au_dbtaildir(parent);
- if (bstart == bend)
- goto out_parent; /* success */
-
- e2 = au_wbr_create_mfs(dentry, isdir);
- if (e2 < 0)
- goto out_parent; /* success */
-
- /* when the available size is equal, select upper one */
- sb = dentry->d_sb;
- br = au_sbr(sb, err);
- b = br->br_wbr->wbr_bytes;
- AuDbg("b%d, %llu\n", err, b);
-
- for (bindex = bstart; bindex <= bend; bindex++) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || !h_parent->d_inode)
- continue;
-
- br = au_sbr(sb, bindex);
- if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) {
- b = br->br_wbr->wbr_bytes;
- err = bindex;
- AuDbg("b%d, %llu\n", err, b);
- }
- }
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
- out_parent:
- dput(parent);
- out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* policies for copyup */
-
-/* top down parent */
-static int au_wbr_copyup_tdp(struct dentry *dentry)
-{
- return au_wbr_create_tdp(dentry, /*isdir, anything is ok*/0);
-}
-
-/* bottom up parent */
-static int au_wbr_copyup_bup(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bindex, bstart;
- struct dentry *parent, *h_parent;
- struct super_block *sb;
-
- err = -EROFS;
- sb = dentry->d_sb;
- parent = dget_parent(dentry);
- bstart = au_dbstart(parent);
- for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || !h_parent->d_inode)
- continue;
-
- if (!au_br_rdonly(au_sbr(sb, bindex))) {
- err = bindex;
- break;
- }
- }
- dput(parent);
-
- /* bottom up here */
- if (unlikely(err < 0))
- err = au_wbr_bu(sb, bstart - 1);
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* bottom up */
-static int au_wbr_copyup_bu(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bstart;
-
- bstart = au_dbstart(dentry);
- err = au_wbr_bu(dentry->d_sb, bstart);
- AuDbg("b%d\n", err);
- if (err > bstart)
- err = au_wbr_nonopq(dentry, err);
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
- [AuWbrCopyup_TDP] = {
- .copyup = au_wbr_copyup_tdp
- },
- [AuWbrCopyup_BUP] = {
- .copyup = au_wbr_copyup_bup
- },
- [AuWbrCopyup_BU] = {
- .copyup = au_wbr_copyup_bu
- }
-};
-
-struct au_wbr_create_operations au_wbr_create_ops[] = {
- [AuWbrCreate_TDP] = {
- .create = au_wbr_create_tdp
- },
- [AuWbrCreate_RR] = {
- .create = au_wbr_create_rr,
- .init = au_wbr_create_init_rr
- },
- [AuWbrCreate_MFS] = {
- .create = au_wbr_create_mfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_MFSV] = {
- .create = au_wbr_create_mfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_MFSRR] = {
- .create = au_wbr_create_mfsrr,
- .init = au_wbr_create_init_mfsrr,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_MFSRRV] = {
- .create = au_wbr_create_mfsrr,
- .init = au_wbr_create_init_mfsrr,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_PMFS] = {
- .create = au_wbr_create_pmfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_PMFSV] = {
- .create = au_wbr_create_pmfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- }
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * whiteout for logical deletion and opaque directory
- */
-
-#include <linux/fs.h>
-#include "aufs.h"
-
-#define WH_MASK S_IRUGO
-
-/*
- * If a directory contains this file, then it is opaque. We start with the
- * .wh. flag so that it is blocked by lookup.
- */
-static struct qstr diropq_name = {
- .name = AUFS_WH_DIROPQ,
- .len = sizeof(AUFS_WH_DIROPQ) - 1
-};
-
-/*
- * generate whiteout name, which is NOT terminated by NULL.
- * @name: original d_name.name
- * @len: original d_name.len
- * @wh: whiteout qstr
- * returns zero when succeeds, otherwise error.
- * succeeded value as wh->name should be freed by kfree().
- */
-int au_wh_name_alloc(struct qstr *wh, const struct qstr *name)
-{
- char *p;
-
- if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN))
- return -ENAMETOOLONG;
-
- wh->len = name->len + AUFS_WH_PFX_LEN;
- p = kmalloc(wh->len, GFP_NOFS);
- wh->name = p;
- if (p) {
- memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
- memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len);
- /* smp_mb(); */
- return 0;
- }
- return -ENOMEM;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * test if the @wh_name exists under @h_parent.
- * @try_sio specifies the necessary of super-io.
- */
-int au_wh_test(struct dentry *h_parent, struct qstr *wh_name,
- struct au_branch *br, int try_sio)
-{
- int err;
- struct dentry *wh_dentry;
-
- if (!try_sio)
- wh_dentry = au_lkup_one(wh_name, h_parent, br, /*nd*/NULL);
- else
- wh_dentry = au_sio_lkup_one(wh_name, h_parent, br);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out;
-
- err = 0;
- if (!wh_dentry->d_inode)
- goto out_wh; /* success */
-
- err = 1;
- if (S_ISREG(wh_dentry->d_inode->i_mode))
- goto out_wh; /* success */
-
- err = -EIO;
- AuIOErr("%.*s Invalid whiteout entry type 0%o.\n",
- AuDLNPair(wh_dentry), wh_dentry->d_inode->i_mode);
-
- out_wh:
- dput(wh_dentry);
- out:
- return err;
-}
-
-/*
- * test if the @h_dentry sets opaque or not.
- */
-int au_diropq_test(struct dentry *h_dentry, struct au_branch *br)
-{
- int err;
- struct inode *h_dir;
-
- h_dir = h_dentry->d_inode;
- err = au_wh_test(h_dentry, &diropq_name, br,
- au_test_h_perm_sio(h_dir, MAY_EXEC));
- return err;
-}
-
-/*
- * returns a negative dentry whose name is unique and temporary.
- */
-struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
- struct qstr *prefix)
-{
- struct dentry *dentry;
- int i;
- char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN_MIN + 1],
- *name, *p;
- static unsigned short cnt;
- struct qstr qs;
-
- BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN);
-
- name = defname;
- qs.len = sizeof(defname) - DNAME_INLINE_LEN_MIN + prefix->len - 1;
- if (unlikely(prefix->len > DNAME_INLINE_LEN_MIN)) {
- dentry = ERR_PTR(-ENAMETOOLONG);
- if (unlikely(qs.len > NAME_MAX))
- goto out;
- dentry = ERR_PTR(-ENOMEM);
- name = kmalloc(qs.len + 1, GFP_NOFS);
- if (unlikely(!name))
- goto out;
- }
-
- /* doubly whiteout-ed */
- memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
- p = name + AUFS_WH_PFX_LEN * 2;
- memcpy(p, prefix->name, prefix->len);
- p += prefix->len;
- *p++ = '.';
- AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN);
-
- qs.name = name;
- for (i = 0; i < 3; i++) {
- sprintf(p, "%.*d", AUFS_WH_TMP_LEN, cnt++);
- dentry = au_sio_lkup_one(&qs, h_parent, br);
- if (IS_ERR(dentry) || !dentry->d_inode)
- goto out_name;
- dput(dentry);
- }
- /* pr_warning("could not get random name\n"); */
- dentry = ERR_PTR(-EEXIST);
- AuDbg("%.*s\n", AuLNPair(&qs));
- BUG();
-
- out_name:
- if (name != defname)
- kfree(name);
- out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/*
- * rename the @h_dentry on @br to the whiteouted temporary name.
- */
-int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br)
-{
- int err;
- struct path h_path = {
- .mnt = br->br_mnt
- };
- struct inode *h_dir;
- struct dentry *h_parent;
-
- h_parent = h_dentry->d_parent; /* dir inode is locked */
- h_dir = h_parent->d_inode;
- IMustLock(h_dir);
-
- h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry))
- goto out;
-
- /* under the same dir, no need to lock_rename() */
- err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path);
- AuTraceErr(err);
- dput(h_path.dentry);
-
- out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * functions for removing a whiteout
- */
-
-static int do_unlink_wh(struct inode *h_dir, struct path *h_path)
-{
- int force;
-
- /*
- * forces superio when the dir has a sticky bit.
- * this may be a violation of unix fs semantics.
- */
- force = (h_dir->i_mode & S_ISVTX)
- && h_path->dentry->d_inode->i_uid != current_fsuid();
- return vfsub_unlink(h_dir, h_path, force);
-}
-
-int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
- struct dentry *dentry)
-{
- int err;
-
- err = do_unlink_wh(h_dir, h_path);
- if (!err && dentry)
- au_set_dbwh(dentry, -1);
-
- return err;
-}
-
-static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh,
- struct au_branch *br)
-{
- int err;
- struct path h_path = {
- .mnt = br->br_mnt
- };
-
- err = 0;
- h_path.dentry = au_lkup_one(wh, h_parent, br, /*nd*/NULL);
- if (IS_ERR(h_path.dentry))
- err = PTR_ERR(h_path.dentry);
- else {
- if (h_path.dentry->d_inode
- && S_ISREG(h_path.dentry->d_inode->i_mode))
- err = do_unlink_wh(h_parent->d_inode, &h_path);
- dput(h_path.dentry);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * initialize/clean whiteout for a branch
- */
-
-static void au_wh_clean(struct inode *h_dir, struct path *whpath,
- const int isdir)
-{
- int err;
-
- if (!whpath->dentry->d_inode)
- return;
-
- err = mnt_want_write(whpath->mnt);
- if (!err) {
- if (isdir)
- err = vfsub_rmdir(h_dir, whpath);
- else
- err = vfsub_unlink(h_dir, whpath, /*force*/0);
- mnt_drop_write(whpath->mnt);
- }
- if (unlikely(err))
- pr_warning("failed removing %.*s (%d), ignored.\n",
- AuDLNPair(whpath->dentry), err);
-}
-
-static int test_linkable(struct dentry *h_root)
-{
- struct inode *h_dir = h_root->d_inode;
-
- if (h_dir->i_op->link)
- return 0;
-
- pr_err("%.*s (%s) doesn't support link(2), use noplink and rw+nolwh\n",
- AuDLNPair(h_root), au_sbtype(h_root->d_sb));
- return -ENOSYS;
-}
-
-/* todo: should this mkdir be done in /sbin/mount.aufs helper? */
-static int au_whdir(struct inode *h_dir, struct path *path)
-{
- int err;
-
- err = -EEXIST;
- if (!path->dentry->d_inode) {
- int mode = S_IRWXU;
-
- if (au_test_nfs(path->dentry->d_sb))
- mode |= S_IXUGO;
- err = mnt_want_write(path->mnt);
- if (!err) {
- err = vfsub_mkdir(h_dir, path, mode);
- mnt_drop_write(path->mnt);
- }
- } else if (S_ISDIR(path->dentry->d_inode->i_mode))
- err = 0;
- else
- pr_err("unknown %.*s exists\n", AuDLNPair(path->dentry));
-
- return err;
-}
-
-struct au_wh_base {
- const struct qstr *name;
- struct dentry *dentry;
-};
-
-static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[],
- struct path *h_path)
-{
- h_path->dentry = base[AuBrWh_BASE].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/0);
- h_path->dentry = base[AuBrWh_PLINK].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/1);
- h_path->dentry = base[AuBrWh_ORPH].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/1);
-}
-
-/*
- * returns tri-state,
- * minus: error, caller should print the mesage
- * zero: succuess
- * plus: error, caller should NOT print the mesage
- */
-static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr,
- int do_plink, struct au_wh_base base[],
- struct path *h_path)
-{
- int err;
- struct inode *h_dir;
-
- h_dir = h_root->d_inode;
- h_path->dentry = base[AuBrWh_BASE].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/0);
- h_path->dentry = base[AuBrWh_PLINK].dentry;
- if (do_plink) {
- err = test_linkable(h_root);
- if (unlikely(err)) {
- err = 1;
- goto out;
- }
-
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
- } else
- au_wh_clean(h_dir, h_path, /*isdir*/1);
- h_path->dentry = base[AuBrWh_ORPH].dentry;
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
-
- out:
- return err;
-}
-
-/*
- * for the moment, aufs supports the branch filesystem which does not support
- * link(2). testing on FAT which does not support i_op->setattr() fully either,
- * copyup failed. finally, such filesystem will not be used as the writable
- * branch.
- *
- * returns tri-state, see above.
- */
-static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr,
- int do_plink, struct au_wh_base base[],
- struct path *h_path)
-{
- int err;
- struct inode *h_dir;
-
- WbrWhMustWriteLock(wbr);
-
- err = test_linkable(h_root);
- if (unlikely(err)) {
- err = 1;
- goto out;
- }
-
- /*
- * todo: should this create be done in /sbin/mount.aufs helper?
- */
- err = -EEXIST;
- h_dir = h_root->d_inode;
- if (!base[AuBrWh_BASE].dentry->d_inode) {
- err = mnt_want_write(h_path->mnt);
- if (!err) {
- h_path->dentry = base[AuBrWh_BASE].dentry;
- err = vfsub_create(h_dir, h_path, WH_MASK);
- mnt_drop_write(h_path->mnt);
- }
- } else if (S_ISREG(base[AuBrWh_BASE].dentry->d_inode->i_mode))
- err = 0;
- else
- pr_err("unknown %.*s/%.*s exists\n",
- AuDLNPair(h_root), AuDLNPair(base[AuBrWh_BASE].dentry));
- if (unlikely(err))
- goto out;
-
- h_path->dentry = base[AuBrWh_PLINK].dentry;
- if (do_plink) {
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
- } else
- au_wh_clean(h_dir, h_path, /*isdir*/1);
- wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry);
-
- h_path->dentry = base[AuBrWh_ORPH].dentry;
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
-
- out:
- return err;
-}
-
-/*
- * initialize the whiteout base file/dir for @br.
- */
-int au_wh_init(struct dentry *h_root, struct au_branch *br,
- struct super_block *sb)
-{
- int err, i;
- const unsigned char do_plink
- = !!au_opt_test(au_mntflags(sb), PLINK);
- struct path path = {
- .mnt = br->br_mnt
- };
- struct inode *h_dir;
- struct au_wbr *wbr = br->br_wbr;
- static const struct qstr base_name[] = {
- [AuBrWh_BASE] = {
- .name = AUFS_BASE_NAME,
- .len = sizeof(AUFS_BASE_NAME) - 1
- },
- [AuBrWh_PLINK] = {
- .name = AUFS_PLINKDIR_NAME,
- .len = sizeof(AUFS_PLINKDIR_NAME) - 1
- },
- [AuBrWh_ORPH] = {
- .name = AUFS_ORPHDIR_NAME,
- .len = sizeof(AUFS_ORPHDIR_NAME) - 1
- }
- };
- struct au_wh_base base[] = {
- [AuBrWh_BASE] = {
- .name = base_name + AuBrWh_BASE,
- .dentry = NULL
- },
- [AuBrWh_PLINK] = {
- .name = base_name + AuBrWh_PLINK,
- .dentry = NULL
- },
- [AuBrWh_ORPH] = {
- .name = base_name + AuBrWh_ORPH,
- .dentry = NULL
- }
- };
-
- if (wbr)
- WbrWhMustWriteLock(wbr);
-
- for (i = 0; i < AuBrWh_Last; i++) {
- /* doubly whiteouted */
- struct dentry *d;
-
- d = au_wh_lkup(h_root, (void *)base[i].name, br);
- err = PTR_ERR(d);
- if (IS_ERR(d))
- goto out;
-
- base[i].dentry = d;
- AuDebugOn(wbr
- && wbr->wbr_wh[i]
- && wbr->wbr_wh[i] != base[i].dentry);
- }
-
- if (wbr)
- for (i = 0; i < AuBrWh_Last; i++) {
- dput(wbr->wbr_wh[i]);
- wbr->wbr_wh[i] = NULL;
- }
-
- err = 0;
- switch (br->br_perm) {
- case AuBrPerm_RO:
- case AuBrPerm_ROWH:
- case AuBrPerm_RR:
- case AuBrPerm_RRWH:
- h_dir = h_root->d_inode;
- au_wh_init_ro(h_dir, base, &path);
- break;
-
- case AuBrPerm_RWNoLinkWH:
- err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path);
- if (err > 0)
- goto out;
- else if (err)
- goto out_err;
- break;
-
- case AuBrPerm_RW:
- err = au_wh_init_rw(h_root, wbr, do_plink, base, &path);
- if (err > 0)
- goto out;
- else if (err)
- goto out_err;
- break;
-
- default:
- BUG();
- }
- goto out; /* success */
-
- out_err:
- pr_err("an error(%d) on the writable branch %.*s(%s)\n",
- err, AuDLNPair(h_root), au_sbtype(h_root->d_sb));
- out:
- for (i = 0; i < AuBrWh_Last; i++)
- dput(base[i].dentry);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * whiteouts are all hard-linked usually.
- * when its link count reaches a ceiling, we create a new whiteout base
- * asynchronously.
- */
-
-struct reinit_br_wh {
- struct super_block *sb;
- struct au_branch *br;
-};
-
-static void reinit_br_wh(void *arg)
-{
- int err;
- aufs_bindex_t bindex;
- struct path h_path;
- struct reinit_br_wh *a = arg;
- struct au_wbr *wbr;
- struct inode *dir;
- struct dentry *h_root;
- struct au_hinode *hdir;
-
- err = 0;
- wbr = a->br->br_wbr;
- /* big aufs lock */
- si_noflush_write_lock(a->sb);
- if (!au_br_writable(a->br->br_perm))
- goto out;
- bindex = au_br_index(a->sb, a->br->br_id);
- if (unlikely(bindex < 0))
- goto out;
-
- di_read_lock_parent(a->sb->s_root, AuLock_IR);
- dir = a->sb->s_root->d_inode;
- hdir = au_hi(dir, bindex);
- h_root = au_h_dptr(a->sb->s_root, bindex);
-
- au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
- wbr_wh_write_lock(wbr);
- err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode,
- h_root, a->br);
- if (!err) {
- err = mnt_want_write(a->br->br_mnt);
- if (!err) {
- h_path.dentry = wbr->wbr_whbase;
- h_path.mnt = a->br->br_mnt;
- err = vfsub_unlink(hdir->hi_inode, &h_path, /*force*/0);
- mnt_drop_write(a->br->br_mnt);
- }
- } else {
- pr_warning("%.*s is moved, ignored\n",
- AuDLNPair(wbr->wbr_whbase));
- err = 0;
- }
- dput(wbr->wbr_whbase);
- wbr->wbr_whbase = NULL;
- if (!err)
- err = au_wh_init(h_root, a->br, a->sb);
- wbr_wh_write_unlock(wbr);
- au_hn_imtx_unlock(hdir);
- di_read_unlock(a->sb->s_root, AuLock_IR);
-
- out:
- if (wbr)
- atomic_dec(&wbr->wbr_wh_running);
- atomic_dec(&a->br->br_count);
- au_nwt_done(&au_sbi(a->sb)->si_nowait);
- si_write_unlock(a->sb);
- kfree(arg);
- if (unlikely(err))
- AuIOErr("err %d\n", err);
-}
-
-static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br)
-{
- int do_dec, wkq_err;
- struct reinit_br_wh *arg;
-
- do_dec = 1;
- if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1)
- goto out;
-
- /* ignore ENOMEM */
- arg = kmalloc(sizeof(*arg), GFP_NOFS);
- if (arg) {
- /*
- * dec(wh_running), kfree(arg) and dec(br_count)
- * in reinit function
- */
- arg->sb = sb;
- arg->br = br;
- atomic_inc(&br->br_count);
- wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb);
- if (unlikely(wkq_err)) {
- atomic_dec(&br->br_wbr->wbr_wh_running);
- atomic_dec(&br->br_count);
- kfree(arg);
- }
- do_dec = 0;
- }
-
- out:
- if (do_dec)
- atomic_dec(&br->br_wbr->wbr_wh_running);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create the whiteout @wh.
- */
-static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex,
- struct dentry *wh)
-{
- int err;
- struct path h_path = {
- .dentry = wh
- };
- struct au_branch *br;
- struct au_wbr *wbr;
- struct dentry *h_parent;
- struct inode *h_dir;
-
- h_parent = wh->d_parent; /* dir inode is locked */
- h_dir = h_parent->d_inode;
- IMustLock(h_dir);
-
- br = au_sbr(sb, bindex);
- h_path.mnt = br->br_mnt;
- wbr = br->br_wbr;
- wbr_wh_read_lock(wbr);
- if (wbr->wbr_whbase) {
- err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path);
- if (!err || err != -EMLINK)
- goto out;
-
- /* link count full. re-initialize br_whbase. */
- kick_reinit_br_wh(sb, br);
- }
-
- /* return this error in this context */
- err = vfsub_create(h_dir, &h_path, WH_MASK);
-
- out:
- wbr_wh_read_unlock(wbr);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create or remove the diropq.
- */
-static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int flags)
-{
- struct dentry *opq_dentry, *h_dentry;
- struct super_block *sb;
- struct au_branch *br;
- int err;
-
- sb = dentry->d_sb;
- br = au_sbr(sb, bindex);
- h_dentry = au_h_dptr(dentry, bindex);
- opq_dentry = au_lkup_one(&diropq_name, h_dentry, br, /*nd*/NULL);
- if (IS_ERR(opq_dentry))
- goto out;
-
- if (au_ftest_diropq(flags, CREATE)) {
- err = link_or_create_wh(sb, bindex, opq_dentry);
- if (!err) {
- au_set_dbdiropq(dentry, bindex);
- goto out; /* success */
- }
- } else {
- struct path tmp = {
- .dentry = opq_dentry,
- .mnt = br->br_mnt
- };
- err = do_unlink_wh(au_h_iptr(dentry->d_inode, bindex), &tmp);
- if (!err)
- au_set_dbdiropq(dentry, -1);
- }
- dput(opq_dentry);
- opq_dentry = ERR_PTR(err);
-
- out:
- return opq_dentry;
-}
-
-struct do_diropq_args {
- struct dentry **errp;
- struct dentry *dentry;
- aufs_bindex_t bindex;
- unsigned int flags;
-};
-
-static void call_do_diropq(void *args)
-{
- struct do_diropq_args *a = args;
- *a->errp = do_diropq(a->dentry, a->bindex, a->flags);
-}
-
-struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int flags)
-{
- struct dentry *diropq, *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (!au_test_h_perm_sio(h_dentry->d_inode, MAY_EXEC | MAY_WRITE))
- diropq = do_diropq(dentry, bindex, flags);
- else {
- int wkq_err;
- struct do_diropq_args args = {
- .errp = &diropq,
- .dentry = dentry,
- .bindex = bindex,
- .flags = flags
- };
-
- wkq_err = au_wkq_wait(call_do_diropq, &args);
- if (unlikely(wkq_err))
- diropq = ERR_PTR(wkq_err);
- }
-
- return diropq;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * lookup whiteout dentry.
- * @h_parent: lower parent dentry which must exist and be locked
- * @base_name: name of dentry which will be whiteouted
- * returns dentry for whiteout.
- */
-struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
- struct au_branch *br)
-{
- int err;
- struct qstr wh_name;
- struct dentry *wh_dentry;
-
- err = au_wh_name_alloc(&wh_name, base_name);
- wh_dentry = ERR_PTR(err);
- if (!err) {
- wh_dentry = au_lkup_one(&wh_name, h_parent, br, /*nd*/NULL);
- kfree(wh_name.name);
- }
- return wh_dentry;
-}
-
-/*
- * link/create a whiteout for @dentry on @bindex.
- */
-struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent)
-{
- struct dentry *wh_dentry;
- struct super_block *sb;
- int err;
-
- sb = dentry->d_sb;
- wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex));
- if (!IS_ERR(wh_dentry) && !wh_dentry->d_inode) {
- err = link_or_create_wh(sb, bindex, wh_dentry);
- if (!err)
- au_set_dbwh(dentry, bindex);
- else {
- dput(wh_dentry);
- wh_dentry = ERR_PTR(err);
- }
- }
-
- return wh_dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* Delete all whiteouts in this directory on branch bindex. */
-static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist,
- aufs_bindex_t bindex, struct au_branch *br)
-{
- int err;
- unsigned long ul, n;
- struct qstr wh_name;
- char *p;
- struct hlist_head *head;
- struct au_vdir_wh *tpos;
- struct hlist_node *pos;
- struct au_vdir_destr *str;
-
- err = -ENOMEM;
- p = __getname_gfp(GFP_NOFS);
- wh_name.name = p;
- if (unlikely(!wh_name.name))
- goto out;
-
- err = 0;
- memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
- p += AUFS_WH_PFX_LEN;
- n = whlist->nh_num;
- head = whlist->nh_head;
- for (ul = 0; !err && ul < n; ul++, head++) {
- hlist_for_each_entry(tpos, pos, head, wh_hash) {
- if (tpos->wh_bindex != bindex)
- continue;
-
- str = &tpos->wh_str;
- if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) {
- memcpy(p, str->name, str->len);
- wh_name.len = AUFS_WH_PFX_LEN + str->len;
- err = unlink_wh_name(h_dentry, &wh_name, br);
- if (!err)
- continue;
- break;
- }
- AuIOErr("whiteout name too long %.*s\n",
- str->len, str->name);
- err = -EIO;
- break;
- }
- }
- __putname(wh_name.name);
-
- out:
- return err;
-}
-
-struct del_wh_children_args {
- int *errp;
- struct dentry *h_dentry;
- struct au_nhash *whlist;
- aufs_bindex_t bindex;
- struct au_branch *br;
-};
-
-static void call_del_wh_children(void *args)
-{
- struct del_wh_children_args *a = args;
- *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp)
-{
- struct au_whtmp_rmdir *whtmp;
- int err;
- unsigned int rdhash;
-
- SiMustAnyLock(sb);
-
- whtmp = kmalloc(sizeof(*whtmp), gfp);
- if (unlikely(!whtmp)) {
- whtmp = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- whtmp->dir = NULL;
- whtmp->wh_dentry = NULL;
- /* no estimation for dir size */
- rdhash = au_sbi(sb)->si_rdhash;
- if (!rdhash)
- rdhash = AUFS_RDHASH_DEF;
- err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp);
- if (unlikely(err)) {
- kfree(whtmp);
- whtmp = ERR_PTR(err);
- }
-
- out:
- return whtmp;
-}
-
-void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp)
-{
- dput(whtmp->wh_dentry);
- iput(whtmp->dir);
- au_nhash_wh_free(&whtmp->whlist);
- kfree(whtmp);
-}
-
-/*
- * rmdir the whiteouted temporary named dir @h_dentry.
- * @whlist: whiteouted children.
- */
-int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_nhash *whlist)
-{
- int err;
- struct path h_tmp;
- struct inode *wh_inode, *h_dir;
- struct au_branch *br;
-
- h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
- IMustLock(h_dir);
-
- br = au_sbr(dir->i_sb, bindex);
- wh_inode = wh_dentry->d_inode;
- mutex_lock_nested(&wh_inode->i_mutex, AuLsc_I_CHILD);
-
- /*
- * someone else might change some whiteouts while we were sleeping.
- * it means this whlist may have an obsoleted entry.
- */
- if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE))
- err = del_wh_children(wh_dentry, whlist, bindex, br);
- else {
- int wkq_err;
- struct del_wh_children_args args = {
- .errp = &err,
- .h_dentry = wh_dentry,
- .whlist = whlist,
- .bindex = bindex,
- .br = br
- };
-
- wkq_err = au_wkq_wait(call_del_wh_children, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
- mutex_unlock(&wh_inode->i_mutex);
-
- if (!err) {
- h_tmp.dentry = wh_dentry;
- h_tmp.mnt = br->br_mnt;
- err = vfsub_rmdir(h_dir, &h_tmp);
- /* d_drop(h_dentry); */
- }
-
- if (!err) {
- if (au_ibstart(dir) == bindex) {
- au_cpup_attr_timesizes(dir);
- drop_nlink(dir);
- }
- return 0; /* success */
- }
-
- pr_warning("failed removing %.*s(%d), ignored\n",
- AuDLNPair(wh_dentry), err);
- return err;
-}
-
-static void call_rmdir_whtmp(void *args)
-{
- int err;
- struct au_whtmp_rmdir *a = args;
- struct super_block *sb;
- struct dentry *h_parent;
- struct inode *h_dir;
- struct au_branch *br;
- struct au_hinode *hdir;
-
- /* rmdir by nfsd may cause deadlock with this i_mutex */
- /* mutex_lock(&a->dir->i_mutex); */
- sb = a->dir->i_sb;
- si_noflush_read_lock(sb);
- err = au_test_ro(sb, a->bindex, NULL);
- if (unlikely(err))
- goto out;
-
- err = -EIO;
- br = au_sbr(sb, a->bindex);
- ii_write_lock_parent(a->dir);
- h_parent = dget_parent(a->wh_dentry);
- h_dir = h_parent->d_inode;
- hdir = au_hi(a->dir, a->bindex);
- au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
- err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, br);
- if (!err) {
- err = mnt_want_write(br->br_mnt);
- if (!err) {
- err = au_whtmp_rmdir(a->dir, a->bindex, a->wh_dentry,
- &a->whlist);
- mnt_drop_write(br->br_mnt);
- }
- }
- au_hn_imtx_unlock(hdir);
- dput(h_parent);
- ii_write_unlock(a->dir);
-
- out:
- /* mutex_unlock(&a->dir->i_mutex); */
- au_nwt_done(&au_sbi(sb)->si_nowait);
- si_read_unlock(sb);
- au_whtmp_rmdir_free(a);
- if (unlikely(err))
- AuIOErr("err %d\n", err);
-}
-
-void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_whtmp_rmdir *args)
-{
- int wkq_err;
-
- IMustLock(dir);
-
- /* all post-process will be done in do_rmdir_whtmp(). */
- args->dir = au_igrab(dir);
- args->bindex = bindex;
- args->wh_dentry = dget(wh_dentry);
- wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, dir->i_sb);
- if (unlikely(wkq_err)) {
- pr_warning("rmdir error %.*s (%d), ignored\n",
- AuDLNPair(wh_dentry), wkq_err);
- au_whtmp_rmdir_free(args);
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * whiteout for logical deletion and opaque directory
- */
-
-#ifndef __AUFS_WHOUT_H__
-#define __AUFS_WHOUT_H__
-
-#ifdef __KERNEL__
-
-#include <linux/aufs_type.h>
-#include "dir.h"
-
-/* whout.c */
-int au_wh_name_alloc(struct qstr *wh, const struct qstr *name);
-struct au_branch;
-int au_wh_test(struct dentry *h_parent, struct qstr *wh_name,
- struct au_branch *br, int try_sio);
-int au_diropq_test(struct dentry *h_dentry, struct au_branch *br);
-struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
- struct qstr *prefix);
-int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br);
-int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
- struct dentry *dentry);
-int au_wh_init(struct dentry *h_parent, struct au_branch *br,
- struct super_block *sb);
-
-/* diropq flags */
-#define AuDiropq_CREATE 1
-#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name)
-#define au_fset_diropq(flags, name) { (flags) |= AuDiropq_##name; }
-#define au_fclr_diropq(flags, name) { (flags) &= ~AuDiropq_##name; }
-
-struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int flags);
-struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
- struct au_branch *br);
-struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent);
-
-/* real rmdir for the whiteout-ed dir */
-struct au_whtmp_rmdir {
- struct inode *dir;
- aufs_bindex_t bindex;
- struct dentry *wh_dentry;
- struct au_nhash whlist;
-};
-
-struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp);
-void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp);
-int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_nhash *whlist);
-void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_whtmp_rmdir *args);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct dentry *au_diropq_create(struct dentry *dentry,
- aufs_bindex_t bindex)
-{
- return au_diropq_sio(dentry, bindex, AuDiropq_CREATE);
-}
-
-static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex)
-{
- return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE));
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_WHOUT_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * workqueue for asynchronous/super-io operations
- * todo: try new dredential scheme
- */
-
-#include <linux/module.h>
-#include "aufs.h"
-
-/* internal workqueue named AUFS_WKQ_NAME */
-static struct workqueue_struct *au_wkq;
-
-struct au_wkinfo {
- struct work_struct wk;
- struct super_block *sb;
-
- unsigned int flags; /* see wkq.h */
-
- au_wkq_func_t func;
- void *args;
-
- struct completion *comp;
-};
-
-/* ---------------------------------------------------------------------- */
-
-static void wkq_func(struct work_struct *wk)
-{
- struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk);
-
- wkinfo->func(wkinfo->args);
- if (au_ftest_wkq(wkinfo->flags, WAIT))
- complete(wkinfo->comp);
- else {
- kobject_put(&au_sbi(wkinfo->sb)->si_kobj);
- module_put(THIS_MODULE);
- kfree(wkinfo);
- }
-}
-
-/*
- * Since struct completion is large, try allocating it dynamically.
- */
-#if defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS)
-#define AuWkqCompDeclare(name) struct completion *comp = NULL
-
-static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
-{
- *comp = kmalloc(sizeof(**comp), GFP_NOFS);
- if (*comp) {
- init_completion(*comp);
- wkinfo->comp = *comp;
- return 0;
- }
- return -ENOMEM;
-}
-
-static void au_wkq_comp_free(struct completion *comp)
-{
- kfree(comp);
-}
-
-#else
-
-/* no braces */
-#define AuWkqCompDeclare(name) \
- DECLARE_COMPLETION_ONSTACK(_ ## name); \
- struct completion *comp = &_ ## name
-
-static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
-{
- wkinfo->comp = *comp;
- return 0;
-}
-
-static void au_wkq_comp_free(struct completion *comp __maybe_unused)
-{
- /* empty */
-}
-#endif /* 4KSTACKS */
-
-static void au_wkq_run(struct au_wkinfo *wkinfo, int do_wait)
-{
- au_dbg_verify_kthread();
- if (do_wait) {
- INIT_WORK_ON_STACK(&wkinfo->wk, wkq_func);
- queue_work(au_wkq, &wkinfo->wk);
- } else {
- INIT_WORK(&wkinfo->wk, wkq_func);
- schedule_work(&wkinfo->wk);
- }
-}
-
-int au_wkq_wait(au_wkq_func_t func, void *args)
-{
- int err;
- AuWkqCompDeclare(comp);
- struct au_wkinfo wkinfo = {
- .flags = AuWkq_WAIT,
- .func = func,
- .args = args
- };
-
- err = au_wkq_comp_alloc(&wkinfo, &comp);
- if (!err) {
- au_wkq_run(&wkinfo, AuWkq_WAIT);
- /* no timeout, no interrupt */
- wait_for_completion(wkinfo.comp);
- au_wkq_comp_free(comp);
- destroy_work_on_stack(&wkinfo.wk);
- }
-
- return err;
-
-}
-
-int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb)
-{
- int err;
- struct au_wkinfo *wkinfo;
-
- atomic_inc(&au_sbi(sb)->si_nowait.nw_len);
-
- /*
- * wkq_func() must free this wkinfo.
- * it highly depends upon the implementation of workqueue.
- */
- err = 0;
- wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS);
- if (wkinfo) {
- wkinfo->sb = sb;
- wkinfo->flags = !AuWkq_WAIT;
- wkinfo->func = func;
- wkinfo->args = args;
- wkinfo->comp = NULL;
- kobject_get(&au_sbi(sb)->si_kobj);
- __module_get(THIS_MODULE);
-
- au_wkq_run(wkinfo, !AuWkq_WAIT);
- } else {
- err = -ENOMEM;
- atomic_dec(&au_sbi(sb)->si_nowait.nw_len);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_nwt_init(struct au_nowait_tasks *nwt)
-{
- atomic_set(&nwt->nw_len, 0);
- /* smp_mb(); */ /* atomic_set */
- init_waitqueue_head(&nwt->nw_wq);
-}
-
-void au_wkq_fin(void)
-{
- destroy_workqueue(au_wkq);
-}
-
-int __init au_wkq_init(void)
-{
- au_wkq = create_workqueue(AUFS_WKQ_NAME);
- return 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * workqueue for asynchronous/super-io operations
- * todo: try new credentials management scheme
- */
-
-#ifndef __AUFS_WKQ_H__
-#define __AUFS_WKQ_H__
-
-#ifdef __KERNEL__
-
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/aufs_type.h>
-
-struct super_block;
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * in the next operation, wait for the 'nowait' tasks in system-wide workqueue
- */
-struct au_nowait_tasks {
- atomic_t nw_len;
- wait_queue_head_t nw_wq;
-};
-
-/* ---------------------------------------------------------------------- */
-
-typedef void (*au_wkq_func_t)(void *args);
-
-/* wkq flags */
-#define AuWkq_WAIT 1
-#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
-#define au_fset_wkq(flags, name) { (flags) |= AuWkq_##name; }
-#define au_fclr_wkq(flags, name) { (flags) &= ~AuWkq_##name; }
-
-/* wkq.c */
-int au_wkq_wait(au_wkq_func_t func, void *args);
-int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb);
-void au_nwt_init(struct au_nowait_tasks *nwt);
-int __init au_wkq_init(void);
-void au_wkq_fin(void);
-
-/* ---------------------------------------------------------------------- */
-
-static inline int au_test_wkq(struct task_struct *tsk)
-{
- return !tsk->mm
- && !strncmp(tsk->comm, AUFS_WKQ_NAME "/",
- sizeof(AUFS_WKQ_NAME));
-}
-
-static inline void au_nwt_done(struct au_nowait_tasks *nwt)
-{
- if (!atomic_dec_return(&nwt->nw_len))
- wake_up_all(&nwt->nw_wq);
-}
-
-static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
-{
- wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
- return 0;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_WKQ_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2010 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * external inode number translation table and bitmap
- */
-
-#include <linux/file.h>
-#include <linux/seq_file.h>
-#include <linux/uaccess.h>
-#include "aufs.h"
-
-ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size,
- loff_t *pos)
-{
- ssize_t err;
- mm_segment_t oldfs;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- do {
- /* todo: signal_pending? */
- err = func(file, (char __user *)buf, size, pos);
- } while (err == -EAGAIN || err == -EINTR);
- set_fs(oldfs);
-
-#if 0 /* reserved for future use */
- if (err > 0)
- fsnotify_access(file->f_dentry);
-#endif
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static ssize_t do_xino_fwrite(au_writef_t func, struct file *file, void *buf,
- size_t size, loff_t *pos)
-{
- ssize_t err;
- mm_segment_t oldfs;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- /* lockdep_off(); */
- do {
- /* todo: signal_pending? */
- err = func(file, (const char __user *)buf, size, pos);
- } while (err == -EAGAIN || err == -EINTR);
- /* lockdep_on(); */
- set_fs(oldfs);
-
-#if 0 /* reserved for future use */
- if (err > 0)
- fsnotify_modify(file->f_dentry);
-#endif
-
- return err;
-}
-
-struct do_xino_fwrite_args {
- ssize_t *errp;
- au_writef_t func;
- struct file *file;
- void *buf;
- size_t size;
- loff_t *pos;
-};
-
-static void call_do_xino_fwrite(void *args)
-{
- struct do_xino_fwrite_args *a = args;
- *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos);
-}
-
-ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size,
- loff_t *pos)
-{
- ssize_t err;
-
- /* todo: signal block and no wkq? */
- /* todo: new credential scheme */
- /*
- * it breaks RLIMIT_FSIZE and normal user's limit,
- * users should care about quota and real 'filesystem full.'
- */
- if (!au_test_wkq(current)) {
- int wkq_err;
- struct do_xino_fwrite_args args = {
- .errp = &err,
- .func = func,
- .file = file,
- .buf = buf,
- .size = size,
- .pos = pos
- };
-
- wkq_err = au_wkq_wait(call_do_xino_fwrite, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- } else
- err = do_xino_fwrite(func, file, buf, size, pos);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create a new xinofile at the same place/path as @base_file.
- */
-struct file *au_xino_create2(struct file *base_file, struct file *copy_src)
-{
- struct file *file;
- struct dentry *base, *parent;
- struct inode *dir;
- struct qstr *name;
- struct path path;
- int err;
-
- base = base_file->f_dentry;
- parent = base->d_parent; /* dir inode is locked */
- dir = parent->d_inode;
- IMustLock(dir);
-
- file = ERR_PTR(-EINVAL);
- name = &base->d_name;
- path.dentry = vfsub_lookup_one_len(name->name, parent, name->len);
- if (IS_ERR(path.dentry)) {
- file = (void *)path.dentry;
- pr_err("%.*s lookup err %ld\n",
- AuLNPair(name), PTR_ERR(path.dentry));
- goto out;
- }
-
- /* no need to mnt_want_write() since we call dentry_open() later */
- err = vfs_create(dir, path.dentry, S_IRUGO | S_IWUGO, NULL);
- if (unlikely(err)) {
- file = ERR_PTR(err);
- pr_err("%.*s create err %d\n", AuLNPair(name), err);
- goto out_dput;
- }
-
- path.mnt = base_file->f_vfsmnt;
- file = vfsub_dentry_open(&path,
- O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE);
- if (IS_ERR(file)) {
- pr_err("%.*s open err %ld\n", AuLNPair(name), PTR_ERR(file));
- goto out_dput;
- }
-
- err = vfsub_unlink(dir, &file->f_path, /*force*/0);
- if (unlikely(err)) {
- pr_err("%.*s unlink err %d\n", AuLNPair(name), err);
- goto out_fput;
- }
-
- if (copy_src) {
- /* no one can touch copy_src xino */
- err = au_copy_file(file, copy_src,
- i_size_read(copy_src->f_dentry->d_inode));
- if (unlikely(err)) {
- pr_err("%.*s copy err %d\n", AuLNPair(name), err);
- goto out_fput;
- }
- }
- goto out_dput; /* success */
-
- out_fput:
- fput(file);
- file = ERR_PTR(err);
- out_dput:
- dput(path.dentry);
- out:
- return file;
-}
-
-struct au_xino_lock_dir {
- struct au_hinode *hdir;
- struct dentry *parent;
- struct mutex *mtx;
-};
-
-static void au_xino_lock_dir(struct super_block *sb, struct file *xino,
- struct au_xino_lock_dir *ldir)
-{
- aufs_bindex_t brid, bindex;
-
- ldir->hdir = NULL;
- bindex = -1;
- brid = au_xino_brid(sb);
- if (brid >= 0)
- bindex = au_br_index(sb, brid);
- if (bindex >= 0) {
- ldir->hdir = au_hi(sb->s_root->d_inode, bindex);
- au_hn_imtx_lock_nested(ldir->hdir, AuLsc_I_PARENT);
- } else {
- ldir->parent = dget_parent(xino->f_dentry);
- ldir->mtx = &ldir->parent->d_inode->i_mutex;
- mutex_lock_nested(ldir->mtx, AuLsc_I_PARENT);
- }
-}
-
-static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir)
-{
- if (ldir->hdir)
- au_hn_imtx_unlock(ldir->hdir);
- else {
- mutex_unlock(ldir->mtx);
- dput(ldir->parent);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* trucate xino files asynchronously */
-
-int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err;
- aufs_bindex_t bi, bend;
- struct au_branch *br;
- struct file *new_xino, *file;
- struct super_block *h_sb;
- struct au_xino_lock_dir ldir;
-
- err = -EINVAL;
- bend = au_sbend(sb);
- if (unlikely(bindex < 0 || bend < bindex))
- goto out;
- br = au_sbr(sb, bindex);
- file = br->br_xino.xi_file;
- if (!file)
- goto out;
-
- au_xino_lock_dir(sb, file, &ldir);
- /* mnt_want_write() is unnecessary here */
- new_xino = au_xino_create2(file, file);
- au_xino_unlock_dir(&ldir);
- err = PTR_ERR(new_xino);
- if (IS_ERR(new_xino))
- goto out;
- err = 0;
- fput(file);
- br->br_xino.xi_file = new_xino;
-
- h_sb = br->br_mnt->mnt_sb;
- for (bi = 0; bi <= bend; bi++) {
- if (unlikely(bi == bindex))
- continue;
- br = au_sbr(sb, bi);
- if (br->br_mnt->mnt_sb != h_sb)
- continue;
-
- fput(br->br_xino.xi_file);
- br->br_xino.xi_file = new_xino;
- get_file(new_xino);
- }
-
- out:
- return err;
-}
-
-struct xino_do_trunc_args {
- struct super_block *sb;
- struct au_branch *br;
-};
-
-static void xino_do_trunc(void *_args)
-{
- struct xino_do_trunc_args *args = _args;
- struct super_block *sb;
- struct au_branch *br;
- struct inode *dir;
- int err;
- aufs_bindex_t bindex;
-
- err = 0;
- sb = args->sb;
- dir = sb->s_root->d_inode;
- br = args->br;
-
- si_noflush_write_lock(sb);
- ii_read_lock_parent(dir);
- bindex = au_br_index(sb, br->br_id);
- err = au_xino_trunc(sb, bindex);
- if (!err
- && br->br_xino.xi_file->f_dentry->d_inode->i_blocks
- >= br->br_xino_upper)
- br->br_xino_upper += AUFS_XINO_TRUNC_STEP;
-
- ii_read_unlock(dir);
- if (unlikely(err))
- pr_warning("err b%d, (%d)\n", bindex, err);
- atomic_dec(&br->br_xino_running);
- atomic_dec(&br->br_count);
- au_nwt_done(&au_sbi(sb)->si_nowait);
- si_write_unlock(sb);
- kfree(args);
-}
-
-static void xino_try_trunc(struct super_block *sb, struct au_branch *br)
-{
- struct xino_do_trunc_args *args;
- int wkq_err;
-
- if (br->br_xino.xi_file->f_dentry->d_inode->i_blocks
- < br->br_xino_upper)
- return;
-
- if (atomic_inc_return(&br->br_xino_running) > 1)
- goto out;
-
- /* lock and kfree() will be called in trunc_xino() */
- args = kmalloc(sizeof(*args), GFP_NOFS);
- if (unlikely(!args)) {
- AuErr1("no memory\n");
- goto out_args;
- }
-
- atomic_inc_return(&br->br_count);
- args->sb = sb;
- args->br = br;
- wkq_err = au_wkq_nowait(xino_do_trunc, args, sb);
- if (!wkq_err)
- return; /* success */
-
- pr_err("wkq %d\n", wkq_err);
- atomic_dec_return(&br->br_count);
-
- out_args:
- kfree(args);
- out:
- atomic_dec_return(&br->br_xino_running);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_xino_do_write(au_writef_t write, struct file *file,
- ino_t h_ino, ino_t ino)
-{
- loff_t pos;
- ssize_t sz;
-
- pos = h_ino;
- if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) {
- AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
- return -EFBIG;
- }
- pos *= sizeof(ino);
- sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos);
- if (sz == sizeof(ino))
- return 0; /* success */
-
- AuIOErr("write failed (%zd)\n", sz);
- return -EIO;
-}
-
-/*
- * write @ino to the xinofile for the specified branch{@sb, @bindex}
- * at the position of @h_ino.
- * even if @ino is zero, it is written to the xinofile and means no entry.
- * if the size of the xino file on a specific filesystem exceeds the watermark,
- * try truncating it.
- */
-int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t ino)
-{
- int err;
- unsigned int mnt_flags;
- struct au_branch *br;
-
- BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max)
- || ((loff_t)-1) > 0);
- SiMustAnyLock(sb);
-
- mnt_flags = au_mntflags(sb);
- if (!au_opt_test(mnt_flags, XINO))
- return 0;
-
- br = au_sbr(sb, bindex);
- err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
- h_ino, ino);
- if (!err) {
- if (au_opt_test(mnt_flags, TRUNC_XINO)
- && au_test_fs_trunc_xino(br->br_mnt->mnt_sb))
- xino_try_trunc(sb, br);
- return 0; /* success */
- }
-
- AuIOErr("write failed (%d)\n", err);
- return -EIO;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* aufs inode number bitmap */
-
-static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE;
-static ino_t xib_calc_ino(unsigned long pindex, int bit)
-{
- ino_t ino;
-
- AuDebugOn(bit < 0 || page_bits <= bit);
- ino = AUFS_FIRST_INO + pindex * page_bits + bit;
- return ino;
-}
-
-static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit)
-{
- AuDebugOn(ino < AUFS_FIRST_INO);
- ino -= AUFS_FIRST_INO;
- *pindex = ino / page_bits;
- *bit = ino % page_bits;
-}
-
-static int xib_pindex(struct super_block *sb, unsigned long pindex)
-{
- int err;
- loff_t pos;
- ssize_t sz;
- struct au_sbinfo *sbinfo;
- struct file *xib;
- unsigned long *p;
-
- sbinfo = au_sbi(sb);
- MtxMustLock(&sbinfo->si_xib_mtx);
- AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE
- || !au_opt_test(sbinfo->si_mntflags, XINO));
-
- if (pindex == sbinfo->si_xib_last_pindex)
- return 0;
-
- xib = sbinfo->si_xib;
- p = sbinfo->si_xib_buf;
- pos = sbinfo->si_xib_last_pindex;
- pos *= PAGE_SIZE;
- sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
- if (unlikely(sz != PAGE_SIZE))
- goto out;
-
- pos = pindex;
- pos *= PAGE_SIZE;
- if (i_size_read(xib->f_dentry->d_inode) >= pos + PAGE_SIZE)
- sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos);
- else {
- memset(p, 0, PAGE_SIZE);
- sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
- }
- if (sz == PAGE_SIZE) {
- sbinfo->si_xib_last_pindex = pindex;
- return 0; /* success */
- }
-
- out:
- AuIOErr1("write failed (%zd)\n", sz);
- err = sz;
- if (sz >= 0)
- err = -EIO;
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_xino_write0(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t ino)
-{
- int err, bit;
- unsigned long pindex;
- struct au_sbinfo *sbinfo;
-
- if (!au_opt_test(au_mntflags(sb), XINO))
- return 0;
-
- err = 0;
- if (ino) {
- sbinfo = au_sbi(sb);
- xib_calc_bit(ino, &pindex, &bit);
- AuDebugOn(page_bits <= bit);
- mutex_lock(&sbinfo->si_xib_mtx);
- err = xib_pindex(sb, pindex);
- if (!err) {
- clear_bit(bit, sbinfo->si_xib_buf);
- sbinfo->si_xib_next_bit = bit;
- }
- mutex_unlock(&sbinfo->si_xib_mtx);
- }
-
- if (!err)
- err = au_xino_write(sb, bindex, h_ino, 0);
- return err;
-}
-
-/* get an unused inode number from bitmap */
-ino_t au_xino_new_ino(struct super_block *sb)
-{
- ino_t ino;
- unsigned long *p, pindex, ul, pend;
- struct au_sbinfo *sbinfo;
- struct file *file;
- int free_bit, err;
-
- if (!au_opt_test(au_mntflags(sb), XINO))
- return iunique(sb, AUFS_FIRST_INO);
-
- sbinfo = au_sbi(sb);
- mutex_lock(&sbinfo->si_xib_mtx);
- p = sbinfo->si_xib_buf;
- free_bit = sbinfo->si_xib_next_bit;
- if (free_bit < page_bits && !test_bit(free_bit, p))
- goto out; /* success */
- free_bit = find_first_zero_bit(p, page_bits);
- if (free_bit < page_bits)
- goto out; /* success */
-
- pindex = sbinfo->si_xib_last_pindex;
- for (ul = pindex - 1; ul < ULONG_MAX; ul--) {
- err = xib_pindex(sb, ul);
- if (unlikely(err))
- goto out_err;
- free_bit = find_first_zero_bit(p, page_bits);
- if (free_bit < page_bits)
- goto out; /* success */
- }
-
- file = sbinfo->si_xib;
- pend = i_size_read(file->f_dentry->d_inode) / PAGE_SIZE;
- for (ul = pindex + 1; ul <= pend; ul++) {
- err = xib_pindex(sb, ul);
- if (unlikely(err))
- goto out_err;
- free_bit = find_first_zero_bit(p, page_bits);
- if (free_bit < page_bits)
- goto out; /* success */
- }
- BUG();
-
- out:
- set_bit(free_bit, p);
- sbinfo->si_xib_next_bit++;
- pindex = sbinfo->si_xib_last_pindex;
- mutex_unlock(&sbinfo->si_xib_mtx);
- ino = xib_calc_ino(pindex, free_bit);
- AuDbg("i%lu\n", (unsigned long)ino);
- return ino;
- out_err:
- mutex_unlock(&sbinfo->si_xib_mtx);
- AuDbg("i0\n");
- return 0;
-}
-
-/*
- * read @ino from xinofile for the specified branch{@sb, @bindex}
- * at the position of @h_ino.
- * if @ino does not exist and @do_new is true, get new one.
- */
-int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t *ino)
-{
- int err;
- ssize_t sz;
- loff_t pos;
- struct file *file;
- struct au_sbinfo *sbinfo;
-
- *ino = 0;
- if (!au_opt_test(au_mntflags(sb), XINO))
- return 0; /* no xino */
-
- err = 0;
- sbinfo = au_sbi(sb);
- pos = h_ino;
- if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) {
- AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
- return -EFBIG;
- }
- pos *= sizeof(*ino);
-
- file = au_sbr(sb, bindex)->br_xino.xi_file;
- if (i_size_read(file->f_dentry->d_inode) < pos + sizeof(*ino))
- return 0; /* no ino */
-
- sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos);
- if (sz == sizeof(*ino))
- return 0; /* success */
-
- err = sz;
- if (unlikely(sz >= 0)) {
- err = -EIO;
- AuIOErr("xino read error (%zd)\n", sz);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* create and set a new xino file */
-
-struct file *au_xino_create(struct super_block *sb, char *fname, int silent)
-{
- struct file *file;
- struct dentry *h_parent, *d;
- struct inode *h_dir;
- int err;
-
- /*
- * at mount-time, and the xino file is the default path,
- * hnotify is disabled so we have no notify events to ignore.
- * when a user specified the xino, we cannot get au_hdir to be ignored.
- */
- file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE,
- S_IRUGO | S_IWUGO);
- if (IS_ERR(file)) {
- if (!silent)
- pr_err("open %s(%ld)\n", fname, PTR_ERR(file));
- return file;
- }
-
- /* keep file count */
- h_parent = dget_parent(file->f_dentry);
- h_dir = h_parent->d_inode;
- mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
- /* mnt_want_write() is unnecessary here */
- err = vfsub_unlink(h_dir, &file->f_path, /*force*/0);
- mutex_unlock(&h_dir->i_mutex);
- dput(h_parent);
- if (unlikely(err)) {
- if (!silent)
- pr_err("unlink %s(%d)\n", fname, err);
- goto out;
- }
-
- err = -EINVAL;
- d = file->f_dentry;
- if (unlikely(sb == d->d_sb)) {
- if (!silent)
- pr_err("%s must be outside\n", fname);
- goto out;
- }
- if (unlikely(au_test_fs_bad_xino(d->d_sb))) {
- if (!silent)
- pr_err("xino doesn't support %s(%s)\n",
- fname, au_sbtype(d->d_sb));
- goto out;
- }
- return file; /* success */
-
- out:
- fput(file);
- file = ERR_PTR(err);
- return file;
-}
-
-/*
- * find another branch who is on the same filesystem of the specified
- * branch{@btgt}. search until @bend.
- */
-static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt,
- aufs_bindex_t bend)
-{
- aufs_bindex_t bindex;
- struct super_block *tgt_sb = au_sbr_sb(sb, btgt);
-
- for (bindex = 0; bindex < btgt; bindex++)
- if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
- return bindex;
- for (bindex++; bindex <= bend; bindex++)
- if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
- return bindex;
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * initialize the xinofile for the specified branch @br
- * at the place/path where @base_file indicates.
- * test whether another branch is on the same filesystem or not,
- * if @do_test is true.
- */
-int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino,
- struct file *base_file, int do_test)
-{
- int err;
- ino_t ino;
- aufs_bindex_t bend, bindex;
- struct au_branch *shared_br, *b;
- struct file *file;
- struct super_block *tgt_sb;
-
- shared_br = NULL;
- bend = au_sbend(sb);
- if (do_test) {
- tgt_sb = br->br_mnt->mnt_sb;
- for (bindex = 0; bindex <= bend; bindex++) {
- b = au_sbr(sb, bindex);
- if (tgt_sb == b->br_mnt->mnt_sb) {
- shared_br = b;
- break;
- }
- }
- }
-
- if (!shared_br || !shared_br->br_xino.xi_file) {
- struct au_xino_lock_dir ldir;
-
- au_xino_lock_dir(sb, base_file, &ldir);
- /* mnt_want_write() is unnecessary here */
- file = au_xino_create2(base_file, NULL);
- au_xino_unlock_dir(&ldir);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- br->br_xino.xi_file = file;
- } else {
- br->br_xino.xi_file = shared_br->br_xino.xi_file;
- get_file(br->br_xino.xi_file);
- }
-
- ino = AUFS_ROOT_INO;
- err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
- h_ino, ino);
- if (!err)
- return 0; /* success */
-
-
- out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* trucate a xino bitmap file */
-
-/* todo: slow */
-static int do_xib_restore(struct super_block *sb, struct file *file, void *page)
-{
- int err, bit;
- ssize_t sz;
- unsigned long pindex;
- loff_t pos, pend;
- struct au_sbinfo *sbinfo;
- au_readf_t func;
- ino_t *ino;
- unsigned long *p;
-
- err = 0;
- sbinfo = au_sbi(sb);
- MtxMustLock(&sbinfo->si_xib_mtx);
- p = sbinfo->si_xib_buf;
- func = sbinfo->si_xread;
- pend = i_size_read(file->f_dentry->d_inode);
- pos = 0;
- while (pos < pend) {
- sz = xino_fread(func, file, page, PAGE_SIZE, &pos);
- err = sz;
- if (unlikely(sz <= 0))
- goto out;
-
- err = 0;
- for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) {
- if (unlikely(*ino < AUFS_FIRST_INO))
- continue;
-
- xib_calc_bit(*ino, &pindex, &bit);
- AuDebugOn(page_bits <= bit);
- err = xib_pindex(sb, pindex);
- if (!err)
- set_bit(bit, p);
- else
- goto out;
- }
- }
-
- out:
- return err;
-}
-
-static int xib_restore(struct super_block *sb)
-{
- int err;
- aufs_bindex_t bindex, bend;
- void *page;
-
- err = -ENOMEM;
- page = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!page))
- goto out;
-
- err = 0;
- bend = au_sbend(sb);
- for (bindex = 0; !err && bindex <= bend; bindex++)
- if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0)
- err = do_xib_restore
- (sb, au_sbr(sb, bindex)->br_xino.xi_file, page);
- else
- AuDbg("b%d\n", bindex);
- free_page((unsigned long)page);
-
- out:
- return err;
-}
-
-int au_xib_trunc(struct super_block *sb)
-{
- int err;
- ssize_t sz;
- loff_t pos;
- struct au_xino_lock_dir ldir;
- struct au_sbinfo *sbinfo;
- unsigned long *p;
- struct file *file;
-
- SiMustWriteLock(sb);
-
- err = 0;
- sbinfo = au_sbi(sb);
- if (!au_opt_test(sbinfo->si_mntflags, XINO))
- goto out;
-
- file = sbinfo->si_xib;
- if (i_size_read(file->f_dentry->d_inode) <= PAGE_SIZE)
- goto out;
-
- au_xino_lock_dir(sb, file, &ldir);
- /* mnt_want_write() is unnecessary here */
- file = au_xino_create2(sbinfo->si_xib, NULL);
- au_xino_unlock_dir(&ldir);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- fput(sbinfo->si_xib);
- sbinfo->si_xib = file;
-
- p = sbinfo->si_xib_buf;
- memset(p, 0, PAGE_SIZE);
- pos = 0;
- sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos);
- if (unlikely(sz != PAGE_SIZE)) {
- err = sz;
- AuIOErr("err %d\n", err);
- if (sz >= 0)
- err = -EIO;
- goto out;
- }
-
- mutex_lock(&sbinfo->si_xib_mtx);
- /* mnt_want_write() is unnecessary here */
- err = xib_restore(sb);
- mutex_unlock(&sbinfo->si_xib_mtx);
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * xino mount option handlers
- */
-static au_readf_t find_readf(struct file *h_file)
-{
- const struct file_operations *fop = h_file->f_op;
-
- if (fop) {
- if (fop->read)
- return fop->read;
- if (fop->aio_read)
- return do_sync_read;
- }
- return ERR_PTR(-ENOSYS);
-}
-
-static au_writef_t find_writef(struct file *h_file)
-{
- const struct file_operations *fop = h_file->f_op;
-
- if (fop) {
- if (fop->write)
- return fop->write;
- if (fop->aio_write)
- return do_sync_write;
- }
- return ERR_PTR(-ENOSYS);
-}
-
-/* xino bitmap */
-static void xino_clear_xib(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- sbinfo->si_xread = NULL;
- sbinfo->si_xwrite = NULL;
- if (sbinfo->si_xib)
- fput(sbinfo->si_xib);
- sbinfo->si_xib = NULL;
- free_page((unsigned long)sbinfo->si_xib_buf);
- sbinfo->si_xib_buf = NULL;
-}
-
-static int au_xino_set_xib(struct super_block *sb, struct file *base)
-{
- int err;
- loff_t pos;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- file = au_xino_create2(base, sbinfo->si_xib);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- if (sbinfo->si_xib)
- fput(sbinfo->si_xib);
- sbinfo->si_xib = file;
- sbinfo->si_xread = find_readf(file);
- sbinfo->si_xwrite = find_writef(file);
-
- err = -ENOMEM;
- if (!sbinfo->si_xib_buf)
- sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS);
- if (unlikely(!sbinfo->si_xib_buf))
- goto out_unset;
-
- sbinfo->si_xib_last_pindex = 0;
- sbinfo->si_xib_next_bit = 0;
- if (i_size_read(file->f_dentry->d_inode) < PAGE_SIZE) {
- pos = 0;
- err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf,
- PAGE_SIZE, &pos);
- if (unlikely(err != PAGE_SIZE))
- goto out_free;
- }
- err = 0;
- goto out; /* success */
-
- out_free:
- free_page((unsigned long)sbinfo->si_xib_buf);
- sbinfo->si_xib_buf = NULL;
- if (err >= 0)
- err = -EIO;
- out_unset:
- fput(sbinfo->si_xib);
- sbinfo->si_xib = NULL;
- sbinfo->si_xread = NULL;
- sbinfo->si_xwrite = NULL;
- out:
- return err;
-}
-
-/* xino for each branch */
-static void xino_clear_br(struct super_block *sb)
-{
- aufs_bindex_t bindex, bend;
- struct au_branch *br;
-
- bend = au_sbend(sb);
- for (bindex = 0; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- if (!br || !br->br_xino.xi_file)
- continue;
-
- fput(br->br_xino.xi_file);
- br->br_xino.xi_file = NULL;
- }
-}
-
-static int au_xino_set_br(struct super_block *sb, struct file *base)
-{
- int err;
- ino_t ino;
- aufs_bindex_t bindex, bend, bshared;
- struct {
- struct file *old, *new;
- } *fpair, *p;
- struct au_branch *br;
- struct inode *inode;
- au_writef_t writef;
-
- SiMustWriteLock(sb);
-
- err = -ENOMEM;
- bend = au_sbend(sb);
- fpair = kcalloc(bend + 1, sizeof(*fpair), GFP_NOFS);
- if (unlikely(!fpair))
- goto out;
-
- inode = sb->s_root->d_inode;
- ino = AUFS_ROOT_INO;
- writef = au_sbi(sb)->si_xwrite;
- for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
- br = au_sbr(sb, bindex);
- bshared = is_sb_shared(sb, bindex, bindex - 1);
- if (bshared >= 0) {
- /* shared xino */
- *p = fpair[bshared];
- get_file(p->new);
- }
-
- if (!p->new) {
- /* new xino */
- p->old = br->br_xino.xi_file;
- p->new = au_xino_create2(base, br->br_xino.xi_file);
- err = PTR_ERR(p->new);
- if (IS_ERR(p->new)) {
- p->new = NULL;
- goto out_pair;
- }
- }
-
- err = au_xino_do_write(writef, p->new,
- au_h_iptr(inode, bindex)->i_ino, ino);
- if (unlikely(err))
- goto out_pair;
- }
-
- for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
- br = au_sbr(sb, bindex);
- if (br->br_xino.xi_file)
- fput(br->br_xino.xi_file);
- get_file(p->new);
- br->br_xino.xi_file = p->new;
- }
-
- out_pair:
- for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++)
- if (p->new)
- fput(p->new);
- else
- break;
- kfree(fpair);
- out:
- return err;
-}
-
-void au_xino_clr(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- au_xigen_clr(sb);
- xino_clear_xib(sb);
- xino_clear_br(sb);
- sbinfo = au_sbi(sb);
- /* lvalue, do not call au_mntflags() */
- au_opt_clr(sbinfo->si_mntflags, XINO);
-}
-
-int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount)
-{
- int err, skip;
- struct dentry *parent, *cur_parent;
- struct qstr *dname, *cur_name;
- struct file *cur_xino;
- struct inode *dir;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 0;
- sbinfo = au_sbi(sb);
- parent = dget_parent(xino->file->f_dentry);
- if (remount) {
- skip = 0;
- dname = &xino->file->f_dentry->d_name;
- cur_xino = sbinfo->si_xib;
- if (cur_xino) {
- cur_parent = dget_parent(cur_xino->f_dentry);
- cur_name = &cur_xino->f_dentry->d_name;
- skip = (cur_parent == parent
- && dname->len == cur_name->len
- && !memcmp(dname->name, cur_name->name,
- dname->len));
- dput(cur_parent);
- }
- if (skip)
- goto out;
- }
-
- au_opt_set(sbinfo->si_mntflags, XINO);
- dir = parent->d_inode;
- mutex_lock_nested(&dir->i_mutex, AuLsc_I_PARENT);
- /* mnt_want_write() is unnecessary here */
- err = au_xino_set_xib(sb, xino->file);
- if (!err)
- err = au_xigen_set(sb, xino->file);
- if (!err)
- err = au_xino_set_br(sb, xino->file);
- mutex_unlock(&dir->i_mutex);
- if (!err)
- goto out; /* success */
-
- /* reset all */
- AuIOErr("failed creating xino(%d).\n", err);
-
- out:
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create a xinofile at the default place/path.
- */
-struct file *au_xino_def(struct super_block *sb)
-{
- struct file *file;
- char *page, *p;
- struct au_branch *br;
- struct super_block *h_sb;
- struct path path;
- aufs_bindex_t bend, bindex, bwr;
-
- br = NULL;
- bend = au_sbend(sb);
- bwr = -1;
- for (bindex = 0; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_writable(br->br_perm)
- && !au_test_fs_bad_xino(br->br_mnt->mnt_sb)) {
- bwr = bindex;
- break;
- }
- }
-
- if (bwr >= 0) {
- file = ERR_PTR(-ENOMEM);
- page = __getname_gfp(GFP_NOFS);
- if (unlikely(!page))
- goto out;
- path.mnt = br->br_mnt;
- path.dentry = au_h_dptr(sb->s_root, bwr);
- p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME));
- file = (void *)p;
- if (!IS_ERR(p)) {
- strcat(p, "/" AUFS_XINO_FNAME);
- AuDbg("%s\n", p);
- file = au_xino_create(sb, p, /*silent*/0);
- if (!IS_ERR(file))
- au_xino_brid_set(sb, br->br_id);
- }
- __putname(page);
- } else {
- file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0);
- if (IS_ERR(file))
- goto out;
- h_sb = file->f_dentry->d_sb;
- if (unlikely(au_test_fs_bad_xino(h_sb))) {
- pr_err("xino doesn't support %s(%s)\n",
- AUFS_XINO_DEFPATH, au_sbtype(h_sb));
- fput(file);
- file = ERR_PTR(-EINVAL);
- }
- if (!IS_ERR(file))
- au_xino_brid_set(sb, -1);
- }
-
- out:
- return file;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_xino_path(struct seq_file *seq, struct file *file)
-{
- int err;
-
- err = au_seq_path(seq, &file->f_path);
- if (unlikely(err < 0))
- goto out;
-
- err = 0;
-#define Deleted "\\040(deleted)"
- seq->count -= sizeof(Deleted) - 1;
- AuDebugOn(memcmp(seq->buf + seq->count, Deleted,
- sizeof(Deleted) - 1));
-#undef Deleted
-
- out:
- return err;
-}
projects / linux-flexiantxendom0-natty.git / commitdiff