5 * This file has definitions for some important file table
9 #include <linux/config.h>
10 #include <linux/linkage.h>
11 #include <linux/limits.h>
12 #include <linux/wait.h>
13 #include <linux/types.h>
14 #include <linux/kdev_t.h>
15 #include <linux/ioctl.h>
16 #include <linux/list.h>
17 #include <linux/dcache.h>
18 #include <linux/stat.h>
19 #include <linux/cache.h>
20 #include <linux/radix-tree.h>
21 #include <linux/kobject.h>
22 #include <asm/atomic.h>
26 struct pipe_inode_info;
27 struct poll_table_struct;
29 struct vm_area_struct;
33 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
34 * the file limit at runtime and only root can increase the per-process
35 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
36 * upper limit on files-per-process.
38 * Some programs (notably those using select()) may have to be
39 * recompiled to take full advantage of the new limits..
42 /* Fixed constants first: */
44 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
45 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
47 #define BLOCK_SIZE_BITS 10
48 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
50 /* And dynamically-tunable limits and defaults: */
51 struct files_stat_struct {
52 int nr_files; /* read only */
53 int nr_free_files; /* read only */
54 int max_files; /* tunable */
56 extern struct files_stat_struct files_stat;
58 struct inodes_stat_t {
63 extern struct inodes_stat_t inodes_stat;
65 extern int leases_enable, dir_notify_enable, lease_break_time;
67 #define NR_FILE 8192 /* this can well be larger on a larger system */
68 #define NR_RESERVED_FILES 10 /* reserved for root */
83 #define READA 2 /* read-ahead - don't block if no resources */
84 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
90 /* public flags for file_system_type */
91 #define FS_REQUIRES_DEV 1
92 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
93 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
94 * as nfs_rename() will be cleaned up
97 * These are the fs-independent mount-flags: up to 32 flags are supported
99 #define MS_RDONLY 1 /* Mount read-only */
100 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
101 #define MS_NODEV 4 /* Disallow access to device special files */
102 #define MS_NOEXEC 8 /* Disallow program execution */
103 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
104 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
105 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
106 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
107 #define MS_NOATIME 1024 /* Do not update access times. */
108 #define MS_NODIRATIME 2048 /* Do not update directory access times */
112 #define MS_VERBOSE 32768
113 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
114 #define MS_ONE_SECOND (1<<17) /* fs has 1 sec a/m/ctime resolution */
115 #define MS_ACTIVE (1<<30)
116 #define MS_NOUSER (1<<31)
119 * Superblock flags that can be altered by MS_REMOUNT
121 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
125 * Old magic mount flag and mask
127 #define MS_MGC_VAL 0xC0ED0000
128 #define MS_MGC_MSK 0xffff0000
130 /* Inode flags - they have nothing to superblock flags now */
132 #define S_SYNC 1 /* Writes are synced at once */
133 #define S_NOATIME 2 /* Do not update access times */
134 #define S_QUOTA 4 /* Quota initialized for file */
135 #define S_APPEND 8 /* Append-only file */
136 #define S_IMMUTABLE 16 /* Immutable file */
137 #define S_DEAD 32 /* removed, but still open directory */
138 #define S_NOQUOTA 64 /* Inode is not counted to quota */
139 #define S_DIRSYNC 128 /* Directory modifications are synchronous */
142 * Note that nosuid etc flags are inode-specific: setting some file-system
143 * flags just means all the inodes inherit those flags by default. It might be
144 * possible to override it selectively if you really wanted to with some
145 * ioctl() that is not currently implemented.
147 * Exception: MS_RDONLY is always applied to the entire file system.
149 * Unfortunately, it is possible to change a filesystems flags with it mounted
150 * with files in use. This means that all of the inodes will not have their
151 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
152 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
154 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
156 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
157 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
158 ((inode)->i_flags & S_SYNC))
159 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
160 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
161 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
163 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
164 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
165 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
166 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
167 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
168 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
169 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
170 #define IS_ONE_SECOND(inode) __IS_FLG(inode, MS_ONE_SECOND)
172 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
174 /* the read-only stuff doesn't really belong here, but any other place is
175 probably as bad and I don't want to create yet another include file. */
177 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
178 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
179 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
180 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
181 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
182 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
183 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
184 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
185 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
186 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
187 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
188 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
190 #define BLKPG _IO(0x12,105)/* See blkpg.h */
192 /* Some people are morons. Do not use sizeof! */
194 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
195 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
196 /* This was here just to show that the number is taken -
197 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
199 /* A jump here: 108-111 have been used for various private purposes. */
200 #define BLKBSZGET _IOR(0x12,112,size_t)
201 #define BLKBSZSET _IOW(0x12,113,size_t)
202 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
204 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
205 #define FIBMAP _IO(0x00,1) /* bmap access */
206 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
210 #include <asm/semaphore.h>
211 #include <asm/byteorder.h>
213 /* Used to be a macro which just called the function, now just a function */
214 extern void update_atime (struct inode *);
216 extern void inode_init(unsigned long);
217 extern void mnt_init(unsigned long);
218 extern void files_init(unsigned long);
221 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
222 struct buffer_head *bh_result, int create);
223 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
224 unsigned long max_blocks,
225 struct buffer_head *bh_result, int create);
226 typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
227 ssize_t bytes, void *private);
230 * Attribute flags. These should be or-ed together to figure out what
237 #define ATTR_ATIME 16
238 #define ATTR_MTIME 32
239 #define ATTR_CTIME 64
240 #define ATTR_ATIME_SET 128
241 #define ATTR_MTIME_SET 256
242 #define ATTR_FORCE 512 /* Not a change, but a change it */
243 #define ATTR_ATTR_FLAG 1024
244 #define ATTR_KILL_SUID 2048
245 #define ATTR_KILL_SGID 4096
248 * This is the Inode Attributes structure, used for notify_change(). It
249 * uses the above definitions as flags, to know which values have changed.
250 * Also, in this manner, a Filesystem can look at only the values it cares
251 * about. Basically, these are the attributes that the VFS layer can
252 * request to change from the FS layer.
254 * Derek Atkins <warlord@MIT.EDU> 94-10-20
257 unsigned int ia_valid;
262 struct timespec ia_atime;
263 struct timespec ia_mtime;
264 struct timespec ia_ctime;
265 unsigned int ia_attr_flags;
269 * This is the inode attributes flag definitions
271 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
272 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
273 #define ATTR_FLAG_APPEND 4 /* Append-only file */
274 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
275 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
278 * Includes for diskquotas.
280 #include <linux/quota.h>
283 * oh the beauties of C type declarations.
286 struct address_space;
287 struct writeback_control;
290 struct address_space_operations {
291 int (*writepage)(struct page *page, struct writeback_control *wbc);
292 int (*readpage)(struct file *, struct page *);
293 int (*sync_page)(struct page *);
295 /* Write back some dirty pages from this mapping. */
296 int (*writepages)(struct address_space *, struct writeback_control *);
298 /* Set a page dirty */
299 int (*set_page_dirty)(struct page *page);
301 int (*readpages)(struct file *filp, struct address_space *mapping,
302 struct list_head *pages, unsigned nr_pages);
305 * ext3 requires that a successful prepare_write() call be followed
306 * by a commit_write() call - they must be balanced
308 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
309 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
310 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
311 sector_t (*bmap)(struct address_space *, sector_t);
312 int (*invalidatepage) (struct page *, unsigned long);
313 int (*releasepage) (struct page *, int);
314 int (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
315 loff_t offset, unsigned long nr_segs);
318 struct backing_dev_info;
319 struct address_space {
320 struct inode *host; /* owner: inode, block_device */
321 struct radix_tree_root page_tree; /* radix tree of all pages */
322 spinlock_t page_lock; /* and spinlock protecting it */
323 struct list_head clean_pages; /* list of clean pages */
324 struct list_head dirty_pages; /* list of dirty pages */
325 struct list_head locked_pages; /* list of locked pages */
326 struct list_head io_pages; /* being prepared for I/O */
327 unsigned long nrpages; /* number of total pages */
328 struct address_space_operations *a_ops; /* methods */
329 struct list_head i_mmap; /* list of private mappings */
330 struct list_head i_mmap_shared; /* list of shared mappings */
331 struct semaphore i_shared_sem; /* protect both above lists */
332 atomic_t truncate_count; /* Cover race condition with truncate */
333 unsigned long dirtied_when; /* jiffies of first page dirtying */
334 unsigned long flags; /* error bits/gfp mask */
335 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
336 spinlock_t private_lock; /* for use by the address_space */
337 struct list_head private_list; /* ditto */
338 struct address_space *assoc_mapping; /* ditto */
341 struct block_device {
342 dev_t bd_dev; /* not a kdev_t - it's a search key */
343 struct inode * bd_inode; /* will die */
345 struct semaphore bd_sem; /* open/close mutex */
346 struct list_head bd_inodes;
349 struct block_device * bd_contains;
350 unsigned bd_block_size;
351 struct hd_struct * bd_part;
352 unsigned bd_part_count;
354 struct gendisk * bd_disk;
355 struct list_head bd_list;
357 * Private data. You must have bd_claim'ed the block_device
358 * to use this. NOTE: bd_claim allows an owner to claim
359 * the same device multiple times, the owner must take special
360 * care to not mess up bd_private for that case.
362 unsigned long bd_private;
366 * Use sequence counter to get consistent i_size on 32-bit processors.
368 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
369 #include <linux/seqlock.h>
370 #define __NEED_I_SIZE_ORDERED
371 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
373 #define i_size_ordered_init(inode) do { } while (0)
377 struct hlist_node i_hash;
378 struct list_head i_list;
379 struct list_head i_dentry;
383 unsigned int i_nlink;
388 struct timespec i_atime;
389 struct timespec i_mtime;
390 struct timespec i_ctime;
391 unsigned int i_blkbits;
392 unsigned long i_blksize;
393 unsigned long i_version;
394 unsigned long i_blocks;
395 unsigned short i_bytes;
396 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
397 struct semaphore i_sem;
398 struct inode_operations *i_op;
399 struct file_operations *i_fop; /* former ->i_op->default_file_ops */
400 struct super_block *i_sb;
401 struct file_lock *i_flock;
402 struct address_space *i_mapping;
403 struct address_space i_data;
404 struct dquot *i_dquot[MAXQUOTAS];
405 /* These three should probably be a union */
406 struct list_head i_devices;
407 struct pipe_inode_info *i_pipe;
408 struct block_device *i_bdev;
412 unsigned long i_dnotify_mask; /* Directory notify events */
413 struct dnotify_struct *i_dnotify; /* for directory notifications */
415 unsigned long i_state;
417 unsigned int i_flags;
418 unsigned char i_sock;
420 atomic_t i_writecount;
426 #ifdef __NEED_I_SIZE_ORDERED
427 seqcount_t i_size_seqcount;
432 * NOTE: in a 32bit arch with a preemptable kernel and
433 * an UP compile the i_size_read/write must be atomic
434 * with respect to the local cpu (unlike with preempt disabled),
435 * but they don't need to be atomic with respect to other cpus like in
436 * true SMP (so they need either to either locally disable irq around
437 * the read or for example on x86 they can be still implemented as a
438 * cmpxchg8b without the need of the lock prefix). For SMP compiles
439 * and 64bit archs it makes no difference if preempt is enabled or not.
441 static inline loff_t i_size_read(struct inode *inode)
443 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
448 seq = read_seqcount_begin(&inode->i_size_seqcount);
449 i_size = inode->i_size;
450 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
452 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
456 i_size = inode->i_size;
460 return inode->i_size;
465 static inline void i_size_write(struct inode *inode, loff_t i_size)
467 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
468 write_seqcount_begin(&inode->i_size_seqcount);
469 inode->i_size = i_size;
470 write_seqcount_end(&inode->i_size_seqcount);
471 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
473 inode->i_size = i_size;
476 inode->i_size = i_size;
480 static inline unsigned iminor(struct inode *inode)
482 return MINOR(inode->i_rdev);
485 static inline unsigned imajor(struct inode *inode)
487 return MAJOR(inode->i_rdev);
490 extern struct block_device *I_BDEV(struct inode *inode);
493 rwlock_t lock; /* protects pid, uid, euid fields */
494 int pid; /* pid or -pgrp where SIGIO should be sent */
495 uid_t uid, euid; /* uid/euid of process setting the owner */
496 int signum; /* posix.1b rt signal to be delivered on IO */
501 * Track a single file's readahead state
503 struct file_ra_state {
504 unsigned long start; /* Current window */
506 unsigned long next_size; /* Next window size */
507 unsigned long prev_page; /* Cache last read() position */
508 unsigned long ahead_start; /* Ahead window */
509 unsigned long ahead_size;
510 unsigned long ra_pages; /* Maximum readahead window */
511 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
512 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
516 struct list_head f_list;
517 struct dentry *f_dentry;
518 struct vfsmount *f_vfsmnt;
519 struct file_operations *f_op;
521 unsigned int f_flags;
524 struct fown_struct f_owner;
525 unsigned int f_uid, f_gid;
527 struct file_ra_state f_ra;
529 unsigned long f_version;
532 /* needed for tty driver, and maybe others */
536 /* Used by fs/eventpoll.c to link all the hooks to this file */
537 struct list_head f_ep_links;
538 spinlock_t f_ep_lock;
539 #endif /* #ifdef CONFIG_EPOLL */
540 struct address_space *f_mapping;
542 extern spinlock_t files_lock;
543 #define file_list_lock() spin_lock(&files_lock);
544 #define file_list_unlock() spin_unlock(&files_lock);
546 #define get_file(x) atomic_inc(&(x)->f_count)
547 #define file_count(x) atomic_read(&(x)->f_count)
549 /* Initialize and open a private file and allocate its security structure. */
550 extern int open_private_file(struct file *, struct dentry *, int);
551 /* Release a private file and free its security structure. */
552 extern void close_private_file(struct file *file);
554 #define MAX_NON_LFS ((1UL<<31) - 1)
556 /* Page cache limit. The filesystems should put that into their s_maxbytes
557 limits, otherwise bad things can happen in VM. */
558 #if BITS_PER_LONG==32
559 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
560 #elif BITS_PER_LONG==64
561 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
566 #define FL_ACCESS 8 /* not trying to lock, just looking */
567 #define FL_LOCKD 16 /* lock held by rpc.lockd */
568 #define FL_LEASE 32 /* lease held on this file */
569 #define FL_SLEEP 128 /* A blocking lock */
572 * The POSIX file lock owner is determined by
573 * the "struct files_struct" in the thread group
574 * (or NULL for no owner - BSD locks).
576 * Lockd stuffs a "host" pointer into this.
578 typedef struct files_struct *fl_owner_t;
580 /* that will die - we need it for nfs_lock_info */
581 #include <linux/nfs_fs_i.h>
584 struct file_lock *fl_next; /* singly linked list for this inode */
585 struct list_head fl_link; /* doubly linked list of all locks */
586 struct list_head fl_block; /* circular list of blocked processes */
589 wait_queue_head_t fl_wait;
590 struct file *fl_file;
591 unsigned char fl_flags;
592 unsigned char fl_type;
596 void (*fl_notify)(struct file_lock *); /* unblock callback */
597 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
598 void (*fl_remove)(struct file_lock *); /* lock removal callback */
600 struct fasync_struct * fl_fasync; /* for lease break notifications */
601 unsigned long fl_break_time; /* for nonblocking lease breaks */
604 struct nfs_lock_info nfs_fl;
608 /* The following constant reflects the upper bound of the file/locking space */
610 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
611 #define OFFSET_MAX INT_LIMIT(loff_t)
612 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
615 extern struct list_head file_lock_list;
617 #include <linux/fcntl.h>
619 extern int fcntl_getlk(struct file *, struct flock __user *);
620 extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
622 #if BITS_PER_LONG == 32
623 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
624 extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
627 extern void send_sigio(struct fown_struct *fown, int fd, int band);
628 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
629 extern int fcntl_getlease(struct file *filp);
632 extern void locks_init_lock(struct file_lock *);
633 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
634 extern void locks_remove_posix(struct file *, fl_owner_t);
635 extern void locks_remove_flock(struct file *);
636 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
637 extern int posix_lock_file(struct file *, struct file_lock *);
638 extern void posix_block_lock(struct file_lock *, struct file_lock *);
639 extern void posix_unblock_lock(struct file *, struct file_lock *);
640 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
641 extern int __break_lease(struct inode *inode, unsigned int flags);
642 extern void lease_get_mtime(struct inode *, struct timespec *time);
643 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
644 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
645 extern void steal_locks(fl_owner_t from);
647 struct fasync_struct {
650 struct fasync_struct *fa_next; /* singly linked list */
651 struct file *fa_file;
654 #define FASYNC_MAGIC 0x4601
656 /* SMP safe fasync helpers: */
657 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
658 /* can be called from interrupts */
659 extern void kill_fasync(struct fasync_struct **, int, int);
660 /* only for net: no internal synchronization */
661 extern void __kill_fasync(struct fasync_struct *, int, int);
663 extern int f_setown(struct file *filp, unsigned long arg, int force);
664 extern void f_delown(struct file *filp);
665 extern int send_sigurg(struct fown_struct *fown);
671 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
672 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
674 extern struct list_head super_blocks;
675 extern spinlock_t sb_lock;
677 #define sb_entry(list) list_entry((list), struct super_block, s_list)
678 #define S_BIAS (1<<30)
680 struct list_head s_list; /* Keep this first */
681 dev_t s_dev; /* search index; _not_ kdev_t */
682 unsigned long s_blocksize;
683 unsigned long s_old_blocksize;
684 unsigned char s_blocksize_bits;
685 unsigned char s_dirt;
686 unsigned long long s_maxbytes; /* Max file size */
687 struct file_system_type *s_type;
688 struct super_operations *s_op;
689 struct dquot_operations *dq_op;
690 struct quotactl_ops *s_qcop;
691 struct export_operations *s_export_op;
692 unsigned long s_flags;
693 unsigned long s_magic;
694 struct dentry *s_root;
695 struct rw_semaphore s_umount;
696 struct semaphore s_lock;
703 struct list_head s_dirty; /* dirty inodes */
704 struct list_head s_io; /* parked for writeback */
705 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
706 struct list_head s_files;
708 struct block_device *s_bdev;
709 struct list_head s_instances;
710 struct quota_info s_dquot; /* Diskquota specific options */
712 char s_id[32]; /* Informational name */
714 struct kobject kobj; /* anchor for sysfs */
715 void *s_fs_info; /* Filesystem private info */
718 * The next field is for VFS *only*. No filesystems have any business
719 * even looking at it. You had been warned.
721 struct semaphore s_vfs_rename_sem; /* Kludge */
725 * Superblock locking.
727 static inline void lock_super(struct super_block * sb)
732 static inline void unlock_super(struct super_block * sb)
738 * VFS helper functions..
740 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
741 extern int vfs_mkdir(struct inode *, struct dentry *, int);
742 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
743 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
744 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
745 extern int vfs_rmdir(struct inode *, struct dentry *);
746 extern int vfs_unlink(struct inode *, struct dentry *);
747 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
752 * NOTE! These match bits 12..15 of stat.st_mode
753 * (ie "(i_mode >> 12) & 15").
766 * This is the "filldir" function type, used by readdir() to let
767 * the kernel specify what kind of dirent layout it wants to have.
768 * This allows the kernel to read directories into kernel space or
769 * to have different dirent layouts depending on the binary type.
771 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
773 struct block_device_operations {
774 int (*open) (struct inode *, struct file *);
775 int (*release) (struct inode *, struct file *);
776 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
777 int (*media_changed) (struct gendisk *);
778 int (*revalidate_disk) (struct gendisk *);
779 struct module *owner;
783 * "descriptor" for what we're up to with a read for sendfile().
784 * This allows us to use the same read code yet
785 * have multiple different users of the data that
786 * we read from a file.
788 * The simplest case just copies the data to user
798 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
802 * read, write, poll, fsync, readv, writev can be called
803 * without the big kernel lock held in all filesystems.
805 struct file_operations {
806 struct module *owner;
807 loff_t (*llseek) (struct file *, loff_t, int);
808 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
809 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
810 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
811 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
812 int (*readdir) (struct file *, void *, filldir_t);
813 unsigned int (*poll) (struct file *, struct poll_table_struct *);
814 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
815 int (*mmap) (struct file *, struct vm_area_struct *);
816 int (*open) (struct inode *, struct file *);
817 int (*flush) (struct file *);
818 int (*release) (struct inode *, struct file *);
819 int (*fsync) (struct file *, struct dentry *, int datasync);
820 int (*aio_fsync) (struct kiocb *, int datasync);
821 int (*fasync) (int, struct file *, int);
822 int (*lock) (struct file *, int, struct file_lock *);
823 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
824 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
825 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void __user *);
826 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
827 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
830 struct inode_operations {
831 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
832 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
833 int (*link) (struct dentry *,struct inode *,struct dentry *);
834 int (*unlink) (struct inode *,struct dentry *);
835 int (*symlink) (struct inode *,struct dentry *,const char *);
836 int (*mkdir) (struct inode *,struct dentry *,int);
837 int (*rmdir) (struct inode *,struct dentry *);
838 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
839 int (*rename) (struct inode *, struct dentry *,
840 struct inode *, struct dentry *);
841 int (*readlink) (struct dentry *, char __user *,int);
842 int (*follow_link) (struct dentry *, struct nameidata *);
843 void (*truncate) (struct inode *);
844 int (*permission) (struct inode *, int, struct nameidata *);
845 int (*setattr) (struct dentry *, struct iattr *);
846 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
847 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
848 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
849 ssize_t (*listxattr) (struct dentry *, char *, size_t);
850 int (*removexattr) (struct dentry *, const char *);
855 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
856 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
857 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
858 unsigned long, loff_t *);
859 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
860 unsigned long, loff_t *);
863 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
864 * without the big kernel lock held in all filesystems.
866 struct super_operations {
867 struct inode *(*alloc_inode)(struct super_block *sb);
868 void (*destroy_inode)(struct inode *);
870 void (*read_inode) (struct inode *);
872 void (*dirty_inode) (struct inode *);
873 void (*write_inode) (struct inode *, int);
874 void (*put_inode) (struct inode *);
875 void (*drop_inode) (struct inode *);
876 void (*delete_inode) (struct inode *);
877 void (*put_super) (struct super_block *);
878 void (*write_super) (struct super_block *);
879 int (*sync_fs)(struct super_block *sb, int wait);
880 void (*write_super_lockfs) (struct super_block *);
881 void (*unlockfs) (struct super_block *);
882 int (*statfs) (struct super_block *, struct kstatfs *);
883 int (*remount_fs) (struct super_block *, int *, char *);
884 void (*clear_inode) (struct inode *);
885 void (*umount_begin) (struct super_block *);
887 int (*show_options)(struct seq_file *, struct vfsmount *);
890 /* Inode state bits. Protected by inode_lock. */
891 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
892 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
893 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
899 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
901 extern void __mark_inode_dirty(struct inode *, int);
902 static inline void mark_inode_dirty(struct inode *inode)
904 __mark_inode_dirty(inode, I_DIRTY);
907 static inline void mark_inode_dirty_sync(struct inode *inode)
909 __mark_inode_dirty(inode, I_DIRTY_SYNC);
914 * &export_operations - for nfsd to communicate with file systems
915 * decode_fh: decode a file handle fragment and return a &struct dentry
916 * encode_fh: encode a file handle fragment from a dentry
917 * get_name: find the name for a given inode in a given directory
918 * get_parent: find the parent of a given directory
919 * get_dentry: find a dentry for the inode given a file handle sub-fragment
922 * The export_operations structure provides a means for nfsd to communicate
923 * with a particular exported file system - particularly enabling nfsd and
924 * the filesystem to co-operate when dealing with file handles.
926 * export_operations contains two basic operation for dealing with file handles,
927 * decode_fh() and encode_fh(), and allows for some other operations to be defined
928 * which standard helper routines use to get specific information from the
931 * nfsd encodes information use to determine which filesystem a filehandle
932 * applies to in the initial part of the file handle. The remainder, termed a
933 * file handle fragment, is controlled completely by the filesystem.
934 * The standard helper routines assume that this fragment will contain one or two
935 * sub-fragments, one which identifies the file, and one which may be used to
936 * identify the (a) directory containing the file.
938 * In some situations, nfsd needs to get a dentry which is connected into a
939 * specific part of the file tree. To allow for this, it passes the function
940 * acceptable() together with a @context which can be used to see if the dentry
941 * is acceptable. As there can be multiple dentrys for a given file, the filesystem
942 * should check each one for acceptability before looking for the next. As soon
943 * as an acceptable one is found, it should be returned.
946 * @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len)
947 * and an acceptability testing function (@acceptable, @context). It should return
948 * a &struct dentry which refers to the same file that the file handle fragment refers
949 * to, and which passes the acceptability test. If it cannot, it should return
950 * a %NULL pointer if the file was found but no acceptable &dentries were available, or
951 * a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM).
954 * @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes)
955 * information that can be used by @decode_fh to recover the file refered to by the
956 * &struct dentry @de. If the @connectable flag is set, the encode_fh() should store
957 * sufficient information so that a good attempt can be made to find not only
958 * the file but also it's place in the filesystem. This typically means storing
959 * a reference to de->d_parent in the filehandle fragment.
960 * encode_fh() should return the number of bytes stored or a negative error code
964 * @get_name should find a name for the given @child in the given @parent directory.
965 * The name should be stored in the @name (with the understanding that it is already
966 * pointing to a a %NAME_MAX+1 sized buffer. get_name() should return %0 on success,
967 * a negative error code or error.
968 * @get_name will be called without @parent->i_sem held.
971 * @get_parent should find the parent directory for the given @child which is also
972 * a directory. In the event that it cannot be found, or storage space cannot be
973 * allocated, a %ERR_PTR should be returned.
976 * Given a &super_block (@sb) and a pointer to a file-system specific inode identifier,
977 * possibly an inode number, (@inump) get_dentry() should find the identified inode and
978 * return a dentry for that inode.
979 * Any suitable dentry can be returned including, if necessary, a new dentry created
980 * with d_alloc_root. The caller can then find any other extant dentrys by following the
981 * d_alias links. If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED
982 * should be set, and the dentry should be d_rehash()ed.
984 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned.
985 * The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the
986 * @obj or @parent parameters.
989 * get_parent is called with child->d_inode->i_sem down
990 * get_name is not (which is possibly inconsistent)
993 struct export_operations {
994 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
995 int (*acceptable)(void *context, struct dentry *de),
997 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1000 /* the following are only called from the filesystem itself */
1001 int (*get_name)(struct dentry *parent, char *name,
1002 struct dentry *child);
1003 struct dentry * (*get_parent)(struct dentry *child);
1004 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1006 /* This is set by the exporting module to a standard helper */
1007 struct dentry * (*find_exported_dentry)(
1008 struct super_block *sb, void *obj, void *parent,
1009 int (*acceptable)(void *context, struct dentry *de),
1016 struct file_system_type {
1019 struct super_block *(*get_sb) (struct file_system_type *, int,
1020 const char *, void *);
1021 void (*kill_sb) (struct super_block *);
1022 struct module *owner;
1023 struct file_system_type * next;
1024 struct list_head fs_supers;
1027 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1028 int flags, const char *dev_name, void *data,
1029 int (*fill_super)(struct super_block *, void *, int));
1030 struct super_block *get_sb_single(struct file_system_type *fs_type,
1031 int flags, void *data,
1032 int (*fill_super)(struct super_block *, void *, int));
1033 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1034 int flags, void *data,
1035 int (*fill_super)(struct super_block *, void *, int));
1036 void generic_shutdown_super(struct super_block *sb);
1037 void kill_block_super(struct super_block *sb);
1038 void kill_anon_super(struct super_block *sb);
1039 void kill_litter_super(struct super_block *sb);
1040 void deactivate_super(struct super_block *sb);
1041 int set_anon_super(struct super_block *s, void *data);
1042 struct super_block *sget(struct file_system_type *type,
1043 int (*test)(struct super_block *,void *),
1044 int (*set)(struct super_block *,void *),
1046 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1047 struct super_operations *ops, unsigned long);
1049 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1050 #define fops_get(fops) \
1051 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1052 #define fops_put(fops) \
1053 do { if (fops) module_put((fops)->owner); } while(0)
1055 extern int __register_filesystem(struct file_system_type *, int);
1056 #define register_filesystem(fs) __register_filesystem(fs, 0)
1057 #define register_filesystem_lifo(fs) __register_filesystem(fs, 1)
1058 extern int unregister_filesystem(struct file_system_type *);
1059 extern struct vfsmount *kern_mount(struct file_system_type *);
1060 extern int may_umount(struct vfsmount *);
1061 extern long do_mount(char *, char *, char *, unsigned long, void *);
1063 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1065 /* Return value for VFS lock functions - tells locks.c to lock conventionally
1066 * REALLY kosha for root NFS and nfs_lock
1068 #define LOCK_USE_CLNT 1
1070 #define FLOCK_VERIFY_READ 1
1071 #define FLOCK_VERIFY_WRITE 2
1073 extern int locks_mandatory_locked(struct inode *);
1074 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1077 * Candidates for mandatory locking have the setgid bit set
1078 * but no group execute bit - an otherwise meaningless combination.
1080 #define MANDATORY_LOCK(inode) \
1081 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1083 static inline int locks_verify_locked(struct inode *inode)
1085 if (MANDATORY_LOCK(inode))
1086 return locks_mandatory_locked(inode);
1090 static inline int locks_verify_area(int read_write, struct inode *inode,
1091 struct file *filp, loff_t offset,
1094 if (inode->i_flock && MANDATORY_LOCK(inode))
1095 return locks_mandatory_area(read_write, inode, filp, offset, count);
1099 static inline int locks_verify_truncate(struct inode *inode,
1103 if (inode->i_flock && MANDATORY_LOCK(inode))
1104 return locks_mandatory_area(
1105 FLOCK_VERIFY_WRITE, inode, filp,
1106 size < inode->i_size ? size : inode->i_size,
1107 (size < inode->i_size ? inode->i_size - size
1108 : size - inode->i_size)
1113 static inline int break_lease(struct inode *inode, unsigned int mode)
1116 return __break_lease(inode, mode);
1122 asmlinkage long sys_open(const char __user *, int, int);
1123 asmlinkage long sys_close(unsigned int); /* yes, it's really unsigned */
1124 extern int do_truncate(struct dentry *, loff_t start);
1126 extern struct file *filp_open(const char *, int, int);
1127 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1128 extern int filp_close(struct file *, fl_owner_t id);
1129 extern char * getname(const char __user *);
1132 extern void vfs_caches_init(unsigned long);
1134 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1135 #define putname(name) kmem_cache_free(names_cachep, (void *)(name))
1137 enum {BDEV_FILE, BDEV_SWAP, BDEV_FS, BDEV_RAW};
1138 extern int register_blkdev(unsigned int, const char *);
1139 extern int unregister_blkdev(unsigned int, const char *);
1140 extern struct block_device *bdget(dev_t);
1141 extern void bd_forget(struct inode *inode);
1142 extern void bdput(struct block_device *);
1143 extern int blkdev_open(struct inode *, struct file *);
1144 extern struct block_device *open_by_devnum(dev_t, unsigned, int);
1145 extern struct file_operations def_blk_fops;
1146 extern struct address_space_operations def_blk_aops;
1147 extern struct file_operations def_chr_fops;
1148 extern struct file_operations bad_sock_fops;
1149 extern struct file_operations def_fifo_fops;
1150 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1151 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1152 extern int blkdev_get(struct block_device *, mode_t, unsigned, int);
1153 extern int blkdev_put(struct block_device *, int);
1154 extern int bd_claim(struct block_device *, void *);
1155 extern void bd_release(struct block_device *);
1156 extern void blk_run_queues(void);
1159 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, char *);
1160 extern int register_chrdev_region(dev_t, unsigned, char *);
1161 extern int register_chrdev(unsigned int, const char *,
1162 struct file_operations *);
1163 extern int unregister_chrdev(unsigned int, const char *);
1164 extern void unregister_chrdev_region(dev_t, unsigned);
1165 extern int chrdev_open(struct inode *, struct file *);
1167 /* fs/block_dev.c */
1168 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1169 extern const char *__bdevname(dev_t, char *buffer);
1170 extern const char *bdevname(struct block_device *bdev, char *buffer);
1171 extern struct block_device *lookup_bdev(const char *);
1172 extern struct block_device *open_bdev_excl(const char *, int, int, void *);
1173 extern void close_bdev_excl(struct block_device *, int);
1175 extern void init_special_inode(struct inode *, umode_t, dev_t);
1177 /* Invalid inode operations -- fs/bad_inode.c */
1178 extern void make_bad_inode(struct inode *);
1179 extern int is_bad_inode(struct inode *);
1181 extern struct file_operations read_fifo_fops;
1182 extern struct file_operations write_fifo_fops;
1183 extern struct file_operations rdwr_fifo_fops;
1184 extern struct file_operations read_pipe_fops;
1185 extern struct file_operations write_pipe_fops;
1186 extern struct file_operations rdwr_pipe_fops;
1188 extern int fs_may_remount_ro(struct super_block *);
1191 * return READ, READA, or WRITE
1193 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1196 * return data direction, READ or WRITE
1198 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1200 extern int check_disk_change(struct block_device *);
1201 extern int invalidate_inodes(struct super_block *);
1202 extern int __invalidate_device(struct block_device *, int);
1203 extern int invalidate_partition(struct gendisk *, int);
1204 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1205 pgoff_t start, pgoff_t end);
1206 unsigned long invalidate_inode_pages(struct address_space *mapping);
1207 static inline void invalidate_remote_inode(struct inode *inode)
1209 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1210 S_ISLNK(inode->i_mode))
1211 invalidate_inode_pages(inode->i_mapping);
1213 extern void invalidate_inode_pages2(struct address_space *mapping);
1214 extern void write_inode_now(struct inode *, int);
1215 extern int filemap_fdatawrite(struct address_space *);
1216 extern int filemap_flush(struct address_space *);
1217 extern int filemap_fdatawait(struct address_space *);
1218 extern void sync_supers(void);
1219 extern void sync_filesystems(int wait);
1220 extern void emergency_sync(void);
1221 extern void emergency_remount(void);
1222 extern int do_remount_sb(struct super_block *sb, int flags,
1223 void *data, int force);
1224 extern sector_t bmap(struct inode *, sector_t);
1225 extern int setattr_mask(unsigned int);
1226 extern int notify_change(struct dentry *, struct iattr *);
1227 extern int permission(struct inode *, int, struct nameidata *);
1228 extern int vfs_permission(struct inode *, int);
1229 extern int get_write_access(struct inode *);
1230 extern int deny_write_access(struct file *);
1231 static inline void put_write_access(struct inode * inode)
1233 atomic_dec(&inode->i_writecount);
1235 static inline void allow_write_access(struct file *file)
1238 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1240 extern int do_pipe(int *);
1242 extern int open_namei(const char *, int, int, struct nameidata *);
1243 extern int may_open(struct nameidata *, int, int);
1245 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1246 extern struct file * open_exec(const char *);
1248 /* fs/dcache.c -- generic fs support functions */
1249 extern int is_subdir(struct dentry *, struct dentry *);
1250 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1252 #include <linux/err.h>
1254 /* needed for stackable file system support */
1255 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1257 extern void inode_init_once(struct inode *);
1258 extern void iput(struct inode *);
1259 extern struct inode * igrab(struct inode *);
1260 extern ino_t iunique(struct super_block *, ino_t);
1261 extern int inode_needs_sync(struct inode *inode);
1262 extern void generic_delete_inode(struct inode *inode);
1264 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1265 int (*test)(struct inode *, void *), void *data);
1266 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1268 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1269 extern struct inode * iget_locked(struct super_block *, unsigned long);
1270 extern void unlock_new_inode(struct inode *);
1272 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1274 struct inode *inode = iget_locked(sb, ino);
1276 if (inode && (inode->i_state & I_NEW)) {
1277 sb->s_op->read_inode(inode);
1278 unlock_new_inode(inode);
1284 extern void __iget(struct inode * inode);
1285 extern void clear_inode(struct inode *);
1286 extern void destroy_inode(struct inode *);
1287 extern struct inode *new_inode(struct super_block *);
1288 extern void remove_suid(struct dentry *);
1290 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1291 extern void remove_inode_hash(struct inode *);
1292 static inline void insert_inode_hash(struct inode *inode) {
1293 __insert_inode_hash(inode, inode->i_ino);
1296 extern struct file * get_empty_filp(void);
1297 extern void file_move(struct file *f, struct list_head *list);
1298 extern void file_kill(struct file *f);
1300 extern int submit_bio(int, struct bio *);
1301 extern int bdev_read_only(struct block_device *);
1302 extern int set_blocksize(struct block_device *, int);
1303 extern int sb_set_blocksize(struct super_block *, int);
1304 extern int sb_min_blocksize(struct super_block *, int);
1306 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1307 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1308 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1309 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1310 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1311 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1312 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1313 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1314 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1315 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1316 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1317 unsigned long, loff_t *);
1318 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1319 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1320 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1321 unsigned long nr_segs, loff_t *ppos);
1322 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void __user *);
1323 extern void do_generic_mapping_read(struct address_space *, struct file_ra_state *, struct file *,
1324 loff_t *, read_descriptor_t *, read_actor_t);
1326 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1327 extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
1328 const struct iovec *iov, loff_t offset, unsigned long nr_segs);
1329 extern int blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1330 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1331 unsigned long nr_segs, get_blocks_t *get_blocks, dio_iodone_t *end_io);
1332 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1333 unsigned long nr_segs, loff_t *ppos);
1334 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1335 unsigned long nr_segs, loff_t *ppos);
1336 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1337 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1338 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1339 extern int generic_file_open(struct inode * inode, struct file * filp);
1341 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1342 read_descriptor_t * desc,
1345 do_generic_mapping_read(filp->f_mapping,
1353 extern struct file_operations generic_ro_fops;
1355 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1357 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1358 extern int vfs_follow_link(struct nameidata *, const char *);
1359 extern int page_readlink(struct dentry *, char __user *, int);
1360 extern int page_follow_link(struct dentry *, struct nameidata *);
1361 extern int page_symlink(struct inode *inode, const char *symname, int len);
1362 extern struct inode_operations page_symlink_inode_operations;
1363 extern void generic_fillattr(struct inode *, struct kstat *);
1364 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1365 void inode_add_bytes(struct inode *inode, loff_t bytes);
1366 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1367 loff_t inode_get_bytes(struct inode *inode);
1368 void inode_set_bytes(struct inode *inode, loff_t bytes);
1370 extern int vfs_readdir(struct file *, filldir_t, void *);
1372 extern int vfs_stat(char __user *, struct kstat *);
1373 extern int vfs_lstat(char __user *, struct kstat *);
1374 extern int vfs_fstat(unsigned int, struct kstat *);
1376 extern struct file_system_type *get_fs_type(const char *name);
1377 extern struct super_block *get_super(struct block_device *);
1378 extern struct super_block *user_get_super(dev_t);
1379 extern void drop_super(struct super_block *sb);
1381 extern int dcache_dir_open(struct inode *, struct file *);
1382 extern int dcache_dir_close(struct inode *, struct file *);
1383 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1384 extern int dcache_readdir(struct file *, void *, filldir_t);
1385 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1386 extern int simple_statfs(struct super_block *, struct kstatfs *);
1387 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1388 extern int simple_unlink(struct inode *, struct dentry *);
1389 extern int simple_rmdir(struct inode *, struct dentry *);
1390 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1391 extern int simple_sync_file(struct file *, struct dentry *, int);
1392 extern int simple_empty(struct dentry *);
1393 extern int simple_readpage(struct file *file, struct page *page);
1394 extern int simple_prepare_write(struct file *file, struct page *page,
1395 unsigned offset, unsigned to);
1396 extern int simple_commit_write(struct file *file, struct page *page,
1397 unsigned offset, unsigned to);
1399 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1400 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1401 extern struct file_operations simple_dir_operations;
1402 extern struct inode_operations simple_dir_inode_operations;
1403 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1404 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1405 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1406 extern void simple_release_fs(struct vfsmount **mount, int *count);
1408 extern int inode_change_ok(struct inode *, struct iattr *);
1409 extern int inode_setattr(struct inode *, struct iattr *);
1411 extern void inode_update_time(struct inode *inode, int ctime_too);
1413 static inline ino_t parent_ino(struct dentry *dentry)
1417 spin_lock(&dentry->d_lock);
1418 res = dentry->d_parent->d_inode->i_ino;
1419 spin_unlock(&dentry->d_lock);
1424 extern int unshare_files(void);
1426 #ifdef CONFIG_SECURITY
1427 static inline char *alloc_secdata(void)
1429 return (char *)get_zeroed_page(GFP_KERNEL);
1432 static inline void free_secdata(void *secdata)
1434 free_page((unsigned long)secdata);
1437 static inline char *alloc_secdata(void)
1442 static inline void free_secdata(void *secdata)
1444 #endif /* CONFIG_SECURITY */
1446 #endif /* __KERNEL__ */
1447 #endif /* _LINUX_FS_H */