* linux/fs/nfs/namespace.c
*
* Copyright (C) 2005 Trond Myklebust <Trond.Myklebust@netapp.com>
+ * - Modified by David Howells <dhowells@redhat.com>
*
* NFS namespace
*/
-#include <linux/config.h>
-
#include <linux/dcache.h>
+#include <linux/gfp.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/nfs_fs.h>
#define NFSDBG_FACILITY NFSDBG_VFS
-static void nfs_expire_automounts(void *list);
+static void nfs_expire_automounts(struct work_struct *work);
-LIST_HEAD(nfs_automount_list);
-static DECLARE_WORK(nfs_automount_task, nfs_expire_automounts, &nfs_automount_list);
+static LIST_HEAD(nfs_automount_list);
+static DECLARE_DELAYED_WORK(nfs_automount_task, nfs_expire_automounts);
int nfs_mountpoint_expiry_timeout = 500 * HZ;
+static struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
+ const struct dentry *dentry,
+ struct nfs_fh *fh,
+ struct nfs_fattr *fattr);
+
/*
* nfs_path - reconstruct the path given an arbitrary dentry
* @base - arbitrary string to prepend to the path
+ * @droot - pointer to root dentry for mountpoint
* @dentry - pointer to dentry
* @buffer - result buffer
* @buflen - length of buffer
* This is mainly for use in figuring out the path on the
* server side when automounting on top of an existing partition.
*/
-char *nfs_path(const char *base, const struct dentry *dentry,
+char *nfs_path(const char *base,
+ const struct dentry *droot,
+ const struct dentry *dentry,
char *buffer, ssize_t buflen)
{
- char *end = buffer+buflen;
+ char *end;
int namelen;
+ unsigned seq;
+rename_retry:
+ end = buffer+buflen;
*--end = '\0';
buflen--;
- spin_lock(&dcache_lock);
- while (!IS_ROOT(dentry)) {
+
+ seq = read_seqbegin(&rename_lock);
+ rcu_read_lock();
+ while (!IS_ROOT(dentry) && dentry != droot) {
namelen = dentry->d_name.len;
buflen -= namelen + 1;
if (buflen < 0)
*--end = '/';
dentry = dentry->d_parent;
}
- spin_unlock(&dcache_lock);
+ rcu_read_unlock();
+ if (read_seqretry(&rename_lock, seq))
+ goto rename_retry;
+ if (*end != '/') {
+ if (--buflen < 0)
+ goto Elong;
+ *--end = '/';
+ }
namelen = strlen(base);
/* Strip off excess slashes in base string */
while (namelen > 0 && base[namelen - 1] == '/')
memcpy(end, base, namelen);
return end;
Elong_unlock:
- spin_unlock(&dcache_lock);
+ rcu_read_unlock();
+ if (read_seqretry(&rename_lock, seq))
+ goto rename_retry;
Elong:
return ERR_PTR(-ENAMETOOLONG);
}
struct vfsmount *mnt;
struct nfs_server *server = NFS_SERVER(dentry->d_inode);
struct dentry *parent;
- struct nfs_fh fh;
- struct nfs_fattr fattr;
+ struct nfs_fh *fh = NULL;
+ struct nfs_fattr *fattr = NULL;
int err;
- BUG_ON(IS_ROOT(dentry));
- dprintk("%s: enter\n", __FUNCTION__);
- dput(nd->dentry);
- nd->dentry = dget(dentry);
- if (d_mountpoint(nd->dentry))
- goto out_follow;
+ dprintk("--> nfs_follow_mountpoint()\n");
+
+ err = -ESTALE;
+ if (IS_ROOT(dentry))
+ goto out_err;
+
+ err = -ENOMEM;
+ fh = nfs_alloc_fhandle();
+ fattr = nfs_alloc_fattr();
+ if (fh == NULL || fattr == NULL)
+ goto out_err;
+
+ dprintk("%s: enter\n", __func__);
+ dput(nd->path.dentry);
+ nd->path.dentry = dget(dentry);
+
/* Look it up again */
- parent = dget_parent(nd->dentry);
- err = server->rpc_ops->lookup(parent->d_inode, &nd->dentry->d_name, &fh, &fattr);
+ parent = dget_parent(nd->path.dentry);
+ err = server->nfs_client->rpc_ops->lookup(parent->d_inode,
+ &nd->path.dentry->d_name,
+ fh, fattr);
dput(parent);
if (err != 0)
goto out_err;
- if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL)
- mnt = nfs_do_refmount(nd->mnt, nd->dentry);
+ if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
+ mnt = nfs_do_refmount(nd->path.mnt, nd->path.dentry);
else
- mnt = nfs_do_submount(nd->mnt, nd->dentry, &fh, &fattr);
+ mnt = nfs_do_submount(nd->path.mnt, nd->path.dentry, fh,
+ fattr);
err = PTR_ERR(mnt);
if (IS_ERR(mnt))
goto out_err;
mntget(mnt);
- err = do_add_mount(mnt, nd, nd->mnt->mnt_flags|MNT_SHRINKABLE, &nfs_automount_list);
+ err = do_add_mount(mnt, &nd->path, nd->path.mnt->mnt_flags|MNT_SHRINKABLE,
+ &nfs_automount_list);
if (err < 0) {
mntput(mnt);
if (err == -EBUSY)
goto out_follow;
goto out_err;
}
- mntput(nd->mnt);
- dput(nd->dentry);
- nd->mnt = mnt;
- nd->dentry = dget(mnt->mnt_root);
+ path_put(&nd->path);
+ nd->path.mnt = mnt;
+ nd->path.dentry = dget(mnt->mnt_root);
schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
out:
- dprintk("%s: done, returned %d\n", __FUNCTION__, err);
+ nfs_free_fattr(fattr);
+ nfs_free_fhandle(fh);
+ dprintk("%s: done, returned %d\n", __func__, err);
+
+ dprintk("<-- nfs_follow_mountpoint() = %d\n", err);
return ERR_PTR(err);
out_err:
- path_release(nd);
+ path_put(&nd->path);
goto out;
out_follow:
- while(d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
+ while (d_mountpoint(nd->path.dentry) &&
+ follow_down(&nd->path))
;
err = 0;
goto out;
}
-struct inode_operations nfs_mountpoint_inode_operations = {
+const struct inode_operations nfs_mountpoint_inode_operations = {
.follow_link = nfs_follow_mountpoint,
.getattr = nfs_getattr,
};
-struct inode_operations nfs_referral_inode_operations = {
+const struct inode_operations nfs_referral_inode_operations = {
.follow_link = nfs_follow_mountpoint,
};
-static void nfs_expire_automounts(void *data)
+static void nfs_expire_automounts(struct work_struct *work)
{
- struct list_head *list = (struct list_head *)data;
+ struct list_head *list = &nfs_automount_list;
mark_mounts_for_expiry(list);
if (!list_empty(list))
void nfs_release_automount_timer(void)
{
- if (list_empty(&nfs_automount_list)) {
+ if (list_empty(&nfs_automount_list))
cancel_delayed_work(&nfs_automount_task);
- flush_scheduled_work();
- }
}
/*
struct nfs_clone_mount *mountdata)
{
#ifdef CONFIG_NFS_V4
- struct vfsmount *mnt = NULL;
- switch (server->rpc_ops->version) {
+ struct vfsmount *mnt = ERR_PTR(-EINVAL);
+ switch (server->nfs_client->rpc_ops->version) {
case 2:
case 3:
- mnt = vfs_kern_mount(&clone_nfs_fs_type, 0, devname, mountdata);
+ mnt = vfs_kern_mount(&nfs_xdev_fs_type, 0, devname, mountdata);
break;
case 4:
- mnt = vfs_kern_mount(&clone_nfs4_fs_type, 0, devname, mountdata);
+ mnt = vfs_kern_mount(&nfs4_xdev_fs_type, 0, devname, mountdata);
}
return mnt;
#else
- return vfs_kern_mount(&clone_nfs_fs_type, 0, devname, mountdata);
+ return vfs_kern_mount(&nfs_xdev_fs_type, 0, devname, mountdata);
#endif
}
* @fattr - attributes for new root inode
*
*/
-struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
- const struct dentry *dentry, struct nfs_fh *fh,
- struct nfs_fattr *fattr)
+static struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
+ const struct dentry *dentry,
+ struct nfs_fh *fh,
+ struct nfs_fattr *fattr)
{
struct nfs_clone_mount mountdata = {
.sb = mnt_parent->mnt_sb,
char *page = (char *) __get_free_page(GFP_USER);
char *devname;
- dprintk("%s: submounting on %s/%s\n", __FUNCTION__,
+ dprintk("--> nfs_do_submount()\n");
+
+ dprintk("%s: submounting on %s/%s\n", __func__,
dentry->d_parent->d_name.name,
dentry->d_name.name);
if (page == NULL)
free_page:
free_page((unsigned long)page);
out:
- dprintk("%s: done\n", __FUNCTION__);
+ dprintk("%s: done\n", __func__);
+
+ dprintk("<-- nfs_do_submount() = %p\n", mnt);
return mnt;
}
projects / linux-flexiantxendom0-natty.git / blobdiff