5 * This file has definitions for some important file table
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
11 #include <linux/blk_types.h>
12 #include <linux/types.h>
15 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
16 * the file limit at runtime and only root can increase the per-process
17 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
18 * upper limit on files-per-process.
20 * Some programs (notably those using select()) may have to be
21 * recompiled to take full advantage of the new limits..
24 /* Fixed constants first: */
26 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
28 #define BLOCK_SIZE_BITS 10
29 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
31 #define SEEK_SET 0 /* seek relative to beginning of file */
32 #define SEEK_CUR 1 /* seek relative to current file position */
33 #define SEEK_END 2 /* seek relative to end of file */
34 #define SEEK_MAX SEEK_END
42 /* And dynamically-tunable limits and defaults: */
43 struct files_stat_struct
{
44 unsigned long nr_files
; /* read only */
45 unsigned long nr_free_files
; /* read only */
46 unsigned long max_files
; /* tunable */
49 struct inodes_stat_t
{
52 int dummy
[5]; /* padding for sysctl ABI compatibility */
56 #define NR_FILE 8192 /* this can well be larger on a larger system */
67 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
68 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
71 /* file is open for reading */
72 #define FMODE_READ ((__force fmode_t)0x1)
73 /* file is open for writing */
74 #define FMODE_WRITE ((__force fmode_t)0x2)
75 /* file is seekable */
76 #define FMODE_LSEEK ((__force fmode_t)0x4)
77 /* file can be accessed using pread */
78 #define FMODE_PREAD ((__force fmode_t)0x8)
79 /* file can be accessed using pwrite */
80 #define FMODE_PWRITE ((__force fmode_t)0x10)
81 /* File is opened for execution with sys_execve / sys_uselib */
82 #define FMODE_EXEC ((__force fmode_t)0x20)
83 /* File is opened with O_NDELAY (only set for block devices) */
84 #define FMODE_NDELAY ((__force fmode_t)0x40)
85 /* File is opened with O_EXCL (only set for block devices) */
86 #define FMODE_EXCL ((__force fmode_t)0x80)
87 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
88 (specialy hack for floppy.c) */
89 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
92 * Don't update ctime and mtime.
94 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
95 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
97 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
99 /* Expect random access pattern */
100 #define FMODE_RANDOM ((__force fmode_t)0x1000)
102 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
103 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
105 /* File was opened by fanotify and shouldn't generate fanotify events */
106 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
109 * The below are the various read and write types that we support. Some of
110 * them include behavioral modifiers that send information down to the
111 * block layer and IO scheduler. Terminology:
113 * The block layer uses device plugging to defer IO a little bit, in
114 * the hope that we will see more IO very shortly. This increases
115 * coalescing of adjacent IO and thus reduces the number of IOs we
116 * have to send to the device. It also allows for better queuing,
117 * if the IO isn't mergeable. If the caller is going to be waiting
118 * for the IO, then he must ensure that the device is unplugged so
119 * that the IO is dispatched to the driver.
121 * All IO is handled async in Linux. This is fine for background
122 * writes, but for reads or writes that someone waits for completion
123 * on, we want to notify the block layer and IO scheduler so that they
124 * know about it. That allows them to make better scheduling
125 * decisions. So when the below references 'sync' and 'async', it
126 * is referencing this priority hint.
128 * With that in mind, the available types are:
130 * READ A normal read operation. Device will be plugged.
131 * READ_SYNC A synchronous read. Device is not plugged, caller can
132 * immediately wait on this read without caring about
134 * READA Used for read-ahead operations. Lower priority, and the
135 * block layer could (in theory) choose to ignore this
136 * request if it runs into resource problems.
137 * WRITE A normal async write. Device will be plugged.
138 * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
139 * the hint that someone will be waiting on this IO
140 * shortly. The device must still be unplugged explicitly,
141 * WRITE_SYNC_PLUG does not do this as we could be
142 * submitting more writes before we actually wait on any
144 * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device
145 * immediately after submission. The write equivalent
147 * WRITE_ODIRECT_PLUG Special case write for O_DIRECT only.
148 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
149 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
150 * non-volatile media on completion.
151 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
152 * by a cache flush and data is guaranteed to be on
153 * non-volatile media on completion.
156 #define RW_MASK REQ_WRITE
157 #define RWA_MASK REQ_RAHEAD
160 #define WRITE RW_MASK
161 #define READA RWA_MASK
163 #define READ_SYNC (READ | REQ_SYNC | REQ_UNPLUG)
164 #define READ_META (READ | REQ_META)
165 #define WRITE_SYNC_PLUG (WRITE | REQ_SYNC | REQ_NOIDLE)
166 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
167 #define WRITE_ODIRECT_PLUG (WRITE | REQ_SYNC)
168 #define WRITE_META (WRITE | REQ_META)
169 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
171 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
173 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
180 /* public flags for file_system_type */
181 #define FS_REQUIRES_DEV 1
182 #define FS_BINARY_MOUNTDATA 2
183 #define FS_HAS_SUBTYPE 4
184 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
185 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
186 * during rename() internally.
190 * These are the fs-independent mount-flags: up to 32 flags are supported
192 #define MS_RDONLY 1 /* Mount read-only */
193 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
194 #define MS_NODEV 4 /* Disallow access to device special files */
195 #define MS_NOEXEC 8 /* Disallow program execution */
196 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
197 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
198 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
199 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
200 #define MS_NOATIME 1024 /* Do not update access times. */
201 #define MS_NODIRATIME 2048 /* Do not update directory access times */
205 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
206 MS_VERBOSE is deprecated. */
207 #define MS_SILENT 32768
208 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
209 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
210 #define MS_PRIVATE (1<<18) /* change to private */
211 #define MS_SLAVE (1<<19) /* change to slave */
212 #define MS_SHARED (1<<20) /* change to shared */
213 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
214 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
215 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
216 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
217 #define MS_BORN (1<<29)
218 #define MS_ACTIVE (1<<30)
219 #define MS_NOUSER (1<<31)
222 * Superblock flags that can be altered by MS_REMOUNT
224 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
227 * Old magic mount flag and mask
229 #define MS_MGC_VAL 0xC0ED0000
230 #define MS_MGC_MSK 0xffff0000
232 /* Inode flags - they have nothing to superblock flags now */
234 #define S_SYNC 1 /* Writes are synced at once */
235 #define S_NOATIME 2 /* Do not update access times */
236 #define S_APPEND 4 /* Append-only file */
237 #define S_IMMUTABLE 8 /* Immutable file */
238 #define S_DEAD 16 /* removed, but still open directory */
239 #define S_NOQUOTA 32 /* Inode is not counted to quota */
240 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
241 #define S_NOCMTIME 128 /* Do not update file c/mtime */
242 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
243 #define S_PRIVATE 512 /* Inode is fs-internal */
244 #define S_IMA 1024 /* Inode has an associated IMA struct */
247 * Note that nosuid etc flags are inode-specific: setting some file-system
248 * flags just means all the inodes inherit those flags by default. It might be
249 * possible to override it selectively if you really wanted to with some
250 * ioctl() that is not currently implemented.
252 * Exception: MS_RDONLY is always applied to the entire file system.
254 * Unfortunately, it is possible to change a filesystems flags with it mounted
255 * with files in use. This means that all of the inodes will not have their
256 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
257 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
259 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
261 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
262 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
263 ((inode)->i_flags & S_SYNC))
264 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
265 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
266 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
267 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
268 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
270 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
271 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
272 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
273 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
275 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
276 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
277 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
278 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
279 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
281 /* the read-only stuff doesn't really belong here, but any other place is
282 probably as bad and I don't want to create yet another include file. */
284 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
285 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
286 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
287 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
288 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
289 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
290 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
291 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
292 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
293 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
294 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
295 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
297 #define BLKPG _IO(0x12,105)/* See blkpg.h */
299 /* Some people are morons. Do not use sizeof! */
301 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
302 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
303 /* This was here just to show that the number is taken -
304 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
306 /* A jump here: 108-111 have been used for various private purposes. */
307 #define BLKBSZGET _IOR(0x12,112,size_t)
308 #define BLKBSZSET _IOW(0x12,113,size_t)
309 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
310 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
311 #define BLKTRACESTART _IO(0x12,116)
312 #define BLKTRACESTOP _IO(0x12,117)
313 #define BLKTRACETEARDOWN _IO(0x12,118)
314 #define BLKDISCARD _IO(0x12,119)
315 #define BLKIOMIN _IO(0x12,120)
316 #define BLKIOOPT _IO(0x12,121)
317 #define BLKALIGNOFF _IO(0x12,122)
318 #define BLKPBSZGET _IO(0x12,123)
319 #define BLKDISCARDZEROES _IO(0x12,124)
320 #define BLKSECDISCARD _IO(0x12,125)
322 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
323 #define FIBMAP _IO(0x00,1) /* bmap access */
324 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
325 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
326 #define FITHAW _IOWR('X', 120, int) /* Thaw */
327 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
329 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
330 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
331 #define FS_IOC_GETVERSION _IOR('v', 1, long)
332 #define FS_IOC_SETVERSION _IOW('v', 2, long)
333 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
334 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
335 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
336 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
337 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
340 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
342 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
343 #define FS_UNRM_FL 0x00000002 /* Undelete */
344 #define FS_COMPR_FL 0x00000004 /* Compress file */
345 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
346 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
347 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
348 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
349 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
350 /* Reserved for compression usage... */
351 #define FS_DIRTY_FL 0x00000100
352 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
353 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
354 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
355 /* End compression flags --- maybe not all used */
356 #define FS_BTREE_FL 0x00001000 /* btree format dir */
357 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
358 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
359 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
360 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
361 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
362 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
363 #define FS_EXTENT_FL 0x00080000 /* Extents */
364 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
365 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
367 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
368 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
371 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
372 #define SYNC_FILE_RANGE_WRITE 2
373 #define SYNC_FILE_RANGE_WAIT_AFTER 4
377 #include <linux/linkage.h>
378 #include <linux/wait.h>
379 #include <linux/types.h>
380 #include <linux/kdev_t.h>
381 #include <linux/dcache.h>
382 #include <linux/path.h>
383 #include <linux/stat.h>
384 #include <linux/cache.h>
385 #include <linux/list.h>
386 #include <linux/radix-tree.h>
387 #include <linux/prio_tree.h>
388 #include <linux/init.h>
389 #include <linux/pid.h>
390 #include <linux/mutex.h>
391 #include <linux/capability.h>
392 #include <linux/semaphore.h>
393 #include <linux/fiemap.h>
394 #include <linux/rculist_bl.h>
396 #include <asm/atomic.h>
397 #include <asm/byteorder.h>
399 struct export_operations
;
405 struct pipe_inode_info
;
406 struct poll_table_struct
;
408 struct vm_area_struct
;
412 extern void __init
inode_init(void);
413 extern void __init
inode_init_early(void);
414 extern void __init
files_init(unsigned long);
416 extern struct files_stat_struct files_stat
;
417 extern unsigned long get_max_files(void);
418 extern int sysctl_nr_open
;
419 extern struct inodes_stat_t inodes_stat
;
420 extern int leases_enable
, lease_break_time
;
423 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
424 struct buffer_head
*bh_result
, int create
);
425 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
426 ssize_t bytes
, void *private, int ret
,
430 * Attribute flags. These should be or-ed together to figure out what
433 #define ATTR_MODE (1 << 0)
434 #define ATTR_UID (1 << 1)
435 #define ATTR_GID (1 << 2)
436 #define ATTR_SIZE (1 << 3)
437 #define ATTR_ATIME (1 << 4)
438 #define ATTR_MTIME (1 << 5)
439 #define ATTR_CTIME (1 << 6)
440 #define ATTR_ATIME_SET (1 << 7)
441 #define ATTR_MTIME_SET (1 << 8)
442 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
443 #define ATTR_ATTR_FLAG (1 << 10)
444 #define ATTR_KILL_SUID (1 << 11)
445 #define ATTR_KILL_SGID (1 << 12)
446 #define ATTR_FILE (1 << 13)
447 #define ATTR_KILL_PRIV (1 << 14)
448 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
449 #define ATTR_TIMES_SET (1 << 16)
452 * This is the Inode Attributes structure, used for notify_change(). It
453 * uses the above definitions as flags, to know which values have changed.
454 * Also, in this manner, a Filesystem can look at only the values it cares
455 * about. Basically, these are the attributes that the VFS layer can
456 * request to change from the FS layer.
458 * Derek Atkins <warlord@MIT.EDU> 94-10-20
461 unsigned int ia_valid
;
466 struct timespec ia_atime
;
467 struct timespec ia_mtime
;
468 struct timespec ia_ctime
;
471 * Not an attribute, but an auxilary info for filesystems wanting to
472 * implement an ftruncate() like method. NOTE: filesystem should
473 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
475 struct file
*ia_file
;
479 * Includes for diskquotas.
481 #include <linux/quota.h>
484 * enum positive_aop_returns - aop return codes with specific semantics
486 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
487 * completed, that the page is still locked, and
488 * should be considered active. The VM uses this hint
489 * to return the page to the active list -- it won't
490 * be a candidate for writeback again in the near
491 * future. Other callers must be careful to unlock
492 * the page if they get this return. Returned by
495 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
496 * unlocked it and the page might have been truncated.
497 * The caller should back up to acquiring a new page and
498 * trying again. The aop will be taking reasonable
499 * precautions not to livelock. If the caller held a page
500 * reference, it should drop it before retrying. Returned
503 * address_space_operation functions return these large constants to indicate
504 * special semantics to the caller. These are much larger than the bytes in a
505 * page to allow for functions that return the number of bytes operated on in a
509 enum positive_aop_returns
{
510 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
511 AOP_TRUNCATED_PAGE
= 0x80001,
514 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
515 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
516 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
517 * helper code (eg buffer layer)
518 * to clear GFP_FS from alloc */
521 * oh the beauties of C type declarations.
524 struct address_space
;
525 struct writeback_control
;
528 const struct iovec
*iov
;
529 unsigned long nr_segs
;
534 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
535 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
536 size_t iov_iter_copy_from_user(struct page
*page
,
537 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
538 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
539 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
540 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
542 static inline void iov_iter_init(struct iov_iter
*i
,
543 const struct iovec
*iov
, unsigned long nr_segs
,
544 size_t count
, size_t written
)
547 i
->nr_segs
= nr_segs
;
549 i
->count
= count
+ written
;
551 iov_iter_advance(i
, written
);
554 static inline size_t iov_iter_count(struct iov_iter
*i
)
560 * "descriptor" for what we're up to with a read.
561 * This allows us to use the same read code yet
562 * have multiple different users of the data that
563 * we read from a file.
565 * The simplest case just copies the data to user
578 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
579 unsigned long, unsigned long);
581 struct address_space_operations
{
582 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
583 int (*readpage
)(struct file
*, struct page
*);
584 void (*sync_page
)(struct page
*);
586 /* Write back some dirty pages from this mapping. */
587 int (*writepages
)(struct address_space
*, struct writeback_control
*);
589 /* Set a page dirty. Return true if this dirtied it */
590 int (*set_page_dirty
)(struct page
*page
);
592 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
593 struct list_head
*pages
, unsigned nr_pages
);
595 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
596 loff_t pos
, unsigned len
, unsigned flags
,
597 struct page
**pagep
, void **fsdata
);
598 int (*write_end
)(struct file
*, struct address_space
*mapping
,
599 loff_t pos
, unsigned len
, unsigned copied
,
600 struct page
*page
, void *fsdata
);
602 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
603 sector_t (*bmap
)(struct address_space
*, sector_t
);
604 void (*invalidatepage
) (struct page
*, unsigned long);
605 int (*releasepage
) (struct page
*, gfp_t
);
606 void (*freepage
)(struct page
*);
607 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
608 loff_t offset
, unsigned long nr_segs
);
609 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
610 void **, unsigned long *);
611 /* migrate the contents of a page to the specified target */
612 int (*migratepage
) (struct address_space
*,
613 struct page
*, struct page
*);
614 int (*launder_page
) (struct page
*);
615 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
617 int (*error_remove_page
)(struct address_space
*, struct page
*);
621 * pagecache_write_begin/pagecache_write_end must be used by general code
622 * to write into the pagecache.
624 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
625 loff_t pos
, unsigned len
, unsigned flags
,
626 struct page
**pagep
, void **fsdata
);
628 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
629 loff_t pos
, unsigned len
, unsigned copied
,
630 struct page
*page
, void *fsdata
);
632 struct backing_dev_info
;
633 struct address_space
{
634 struct inode
*host
; /* owner: inode, block_device */
635 struct radix_tree_root page_tree
; /* radix tree of all pages */
636 spinlock_t tree_lock
; /* and lock protecting it */
637 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
638 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
639 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
640 spinlock_t i_mmap_lock
; /* protect tree, count, list */
641 unsigned int truncate_count
; /* Cover race condition with truncate */
642 unsigned long nrpages
; /* number of total pages */
643 pgoff_t writeback_index
;/* writeback starts here */
644 const struct address_space_operations
*a_ops
; /* methods */
645 unsigned long flags
; /* error bits/gfp mask */
646 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
647 spinlock_t private_lock
; /* for use by the address_space */
648 struct list_head private_list
; /* ditto */
649 struct address_space
*assoc_mapping
; /* ditto */
650 } __attribute__((aligned(sizeof(long))));
652 * On most architectures that alignment is already the case; but
653 * must be enforced here for CRIS, to let the least signficant bit
654 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
657 struct block_device
{
658 dev_t bd_dev
; /* not a kdev_t - it's a search key */
659 struct inode
* bd_inode
; /* will die */
660 struct super_block
* bd_super
;
662 struct mutex bd_mutex
; /* open/close mutex */
663 struct list_head bd_inodes
;
668 struct list_head bd_holder_list
;
670 struct block_device
* bd_contains
;
671 unsigned bd_block_size
;
672 struct hd_struct
* bd_part
;
673 /* number of times partitions within this device have been opened. */
674 unsigned bd_part_count
;
676 struct gendisk
* bd_disk
;
677 struct list_head bd_list
;
679 * Private data. You must have bd_claim'ed the block_device
680 * to use this. NOTE: bd_claim allows an owner to claim
681 * the same device multiple times, the owner must take special
682 * care to not mess up bd_private for that case.
684 unsigned long bd_private
;
686 /* The counter of freeze processes */
687 int bd_fsfreeze_count
;
688 /* Mutex for freeze */
689 struct mutex bd_fsfreeze_mutex
;
693 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
696 #define PAGECACHE_TAG_DIRTY 0
697 #define PAGECACHE_TAG_WRITEBACK 1
698 #define PAGECACHE_TAG_TOWRITE 2
700 int mapping_tagged(struct address_space
*mapping
, int tag
);
703 * Might pages of this file be mapped into userspace?
705 static inline int mapping_mapped(struct address_space
*mapping
)
707 return !prio_tree_empty(&mapping
->i_mmap
) ||
708 !list_empty(&mapping
->i_mmap_nonlinear
);
712 * Might pages of this file have been modified in userspace?
713 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
714 * marks vma as VM_SHARED if it is shared, and the file was opened for
715 * writing i.e. vma may be mprotected writable even if now readonly.
717 static inline int mapping_writably_mapped(struct address_space
*mapping
)
719 return mapping
->i_mmap_writable
!= 0;
723 * Use sequence counter to get consistent i_size on 32-bit processors.
725 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
726 #include <linux/seqlock.h>
727 #define __NEED_I_SIZE_ORDERED
728 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
730 #define i_size_ordered_init(inode) do { } while (0)
734 #define ACL_NOT_CACHED ((void *)(-1))
737 /* RCU path lookup touches following: */
741 const struct inode_operations
*i_op
;
742 struct super_block
*i_sb
;
744 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
745 unsigned int i_flags
;
746 struct mutex i_mutex
;
748 unsigned long i_state
;
749 unsigned long dirtied_when
; /* jiffies of first dirtying */
751 struct hlist_node i_hash
;
752 struct list_head i_wb_list
; /* backing dev IO list */
753 struct list_head i_lru
; /* inode LRU list */
754 struct list_head i_sb_list
;
756 struct list_head i_dentry
;
757 struct rcu_head i_rcu
;
761 unsigned int i_nlink
;
763 unsigned int i_blkbits
;
766 #ifdef __NEED_I_SIZE_ORDERED
767 seqcount_t i_size_seqcount
;
769 struct timespec i_atime
;
770 struct timespec i_mtime
;
771 struct timespec i_ctime
;
773 unsigned short i_bytes
;
774 struct rw_semaphore i_alloc_sem
;
775 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
776 struct file_lock
*i_flock
;
777 struct address_space
*i_mapping
;
778 struct address_space i_data
;
780 struct dquot
*i_dquot
[MAXQUOTAS
];
782 struct list_head i_devices
;
784 struct pipe_inode_info
*i_pipe
;
785 struct block_device
*i_bdev
;
791 #ifdef CONFIG_FSNOTIFY
792 __u32 i_fsnotify_mask
; /* all events this inode cares about */
793 struct hlist_head i_fsnotify_marks
;
797 /* protected by i_lock */
798 unsigned int i_readcount
; /* struct files open RO */
800 atomic_t i_writecount
;
801 #ifdef CONFIG_SECURITY
804 #ifdef CONFIG_FS_POSIX_ACL
805 struct posix_acl
*i_acl
;
806 struct posix_acl
*i_default_acl
;
808 void *i_private
; /* fs or device private pointer */
811 static inline int inode_unhashed(struct inode
*inode
)
813 return hlist_unhashed(&inode
->i_hash
);
817 * inode->i_mutex nesting subclasses for the lock validator:
819 * 0: the object of the current VFS operation
824 * The locking order between these classes is
825 * parent -> child -> normal -> xattr -> quota
827 enum inode_i_mutex_lock_class
837 * NOTE: in a 32bit arch with a preemptable kernel and
838 * an UP compile the i_size_read/write must be atomic
839 * with respect to the local cpu (unlike with preempt disabled),
840 * but they don't need to be atomic with respect to other cpus like in
841 * true SMP (so they need either to either locally disable irq around
842 * the read or for example on x86 they can be still implemented as a
843 * cmpxchg8b without the need of the lock prefix). For SMP compiles
844 * and 64bit archs it makes no difference if preempt is enabled or not.
846 static inline loff_t
i_size_read(const struct inode
*inode
)
848 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
853 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
854 i_size
= inode
->i_size
;
855 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
857 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
861 i_size
= inode
->i_size
;
865 return inode
->i_size
;
870 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
871 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
872 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
874 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
876 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
877 write_seqcount_begin(&inode
->i_size_seqcount
);
878 inode
->i_size
= i_size
;
879 write_seqcount_end(&inode
->i_size_seqcount
);
880 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
882 inode
->i_size
= i_size
;
885 inode
->i_size
= i_size
;
889 static inline unsigned iminor(const struct inode
*inode
)
891 return MINOR(inode
->i_rdev
);
894 static inline unsigned imajor(const struct inode
*inode
)
896 return MAJOR(inode
->i_rdev
);
899 extern struct block_device
*I_BDEV(struct inode
*inode
);
902 rwlock_t lock
; /* protects pid, uid, euid fields */
903 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
904 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
905 uid_t uid
, euid
; /* uid/euid of process setting the owner */
906 int signum
; /* posix.1b rt signal to be delivered on IO */
910 * Track a single file's readahead state
912 struct file_ra_state
{
913 pgoff_t start
; /* where readahead started */
914 unsigned int size
; /* # of readahead pages */
915 unsigned int async_size
; /* do asynchronous readahead when
916 there are only # of pages ahead */
918 unsigned int ra_pages
; /* Maximum readahead window */
919 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
920 loff_t prev_pos
; /* Cache last read() position */
924 * Check if @index falls in the readahead windows.
926 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
928 return (index
>= ra
->start
&&
929 index
< ra
->start
+ ra
->size
);
932 #define FILE_MNT_WRITE_TAKEN 1
933 #define FILE_MNT_WRITE_RELEASED 2
937 * fu_list becomes invalid after file_free is called and queued via
938 * fu_rcuhead for RCU freeing
941 struct list_head fu_list
;
942 struct rcu_head fu_rcuhead
;
945 #define f_dentry f_path.dentry
946 #define f_vfsmnt f_path.mnt
947 const struct file_operations
*f_op
;
948 spinlock_t f_lock
; /* f_ep_links, f_flags, no IRQ */
952 atomic_long_t f_count
;
953 unsigned int f_flags
;
956 struct fown_struct f_owner
;
957 const struct cred
*f_cred
;
958 struct file_ra_state f_ra
;
961 #ifdef CONFIG_SECURITY
964 /* needed for tty driver, and maybe others */
968 /* Used by fs/eventpoll.c to link all the hooks to this file */
969 struct list_head f_ep_links
;
970 #endif /* #ifdef CONFIG_EPOLL */
971 struct address_space
*f_mapping
;
972 #ifdef CONFIG_DEBUG_WRITECOUNT
973 unsigned long f_mnt_write_state
;
977 #define get_file(x) atomic_long_inc(&(x)->f_count)
978 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
979 #define file_count(x) atomic_long_read(&(x)->f_count)
981 #ifdef CONFIG_DEBUG_WRITECOUNT
982 static inline void file_take_write(struct file
*f
)
984 WARN_ON(f
->f_mnt_write_state
!= 0);
985 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
987 static inline void file_release_write(struct file
*f
)
989 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
991 static inline void file_reset_write(struct file
*f
)
993 f
->f_mnt_write_state
= 0;
995 static inline void file_check_state(struct file
*f
)
998 * At this point, either both or neither of these bits
1001 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1002 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1004 static inline int file_check_writeable(struct file
*f
)
1006 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1008 printk(KERN_WARNING
"writeable file with no "
1009 "mnt_want_write()\n");
1013 #else /* !CONFIG_DEBUG_WRITECOUNT */
1014 static inline void file_take_write(struct file
*filp
) {}
1015 static inline void file_release_write(struct file
*filp
) {}
1016 static inline void file_reset_write(struct file
*filp
) {}
1017 static inline void file_check_state(struct file
*filp
) {}
1018 static inline int file_check_writeable(struct file
*filp
)
1022 #endif /* CONFIG_DEBUG_WRITECOUNT */
1024 #define MAX_NON_LFS ((1UL<<31) - 1)
1026 /* Page cache limit. The filesystems should put that into their s_maxbytes
1027 limits, otherwise bad things can happen in VM. */
1028 #if BITS_PER_LONG==32
1029 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1030 #elif BITS_PER_LONG==64
1031 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1036 #define FL_ACCESS 8 /* not trying to lock, just looking */
1037 #define FL_EXISTS 16 /* when unlocking, test for existence */
1038 #define FL_LEASE 32 /* lease held on this file */
1039 #define FL_CLOSE 64 /* unlock on close */
1040 #define FL_SLEEP 128 /* A blocking lock */
1043 * Special return value from posix_lock_file() and vfs_lock_file() for
1044 * asynchronous locking.
1046 #define FILE_LOCK_DEFERRED 1
1049 * The POSIX file lock owner is determined by
1050 * the "struct files_struct" in the thread group
1051 * (or NULL for no owner - BSD locks).
1053 * Lockd stuffs a "host" pointer into this.
1055 typedef struct files_struct
*fl_owner_t
;
1057 struct file_lock_operations
{
1058 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1059 void (*fl_release_private
)(struct file_lock
*);
1062 struct lock_manager_operations
{
1063 int (*fl_compare_owner
)(struct file_lock
*, struct file_lock
*);
1064 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
1065 int (*fl_grant
)(struct file_lock
*, struct file_lock
*, int);
1066 void (*fl_release_private
)(struct file_lock
*);
1067 void (*fl_break
)(struct file_lock
*);
1068 int (*fl_mylease
)(struct file_lock
*, struct file_lock
*);
1069 int (*fl_change
)(struct file_lock
**, int);
1072 struct lock_manager
{
1073 struct list_head list
;
1076 void locks_start_grace(struct lock_manager
*);
1077 void locks_end_grace(struct lock_manager
*);
1078 int locks_in_grace(void);
1080 /* that will die - we need it for nfs_lock_info */
1081 #include <linux/nfs_fs_i.h>
1084 struct file_lock
*fl_next
; /* singly linked list for this inode */
1085 struct list_head fl_link
; /* doubly linked list of all locks */
1086 struct list_head fl_block
; /* circular list of blocked processes */
1087 fl_owner_t fl_owner
;
1088 unsigned char fl_flags
;
1089 unsigned char fl_type
;
1090 unsigned int fl_pid
;
1091 struct pid
*fl_nspid
;
1092 wait_queue_head_t fl_wait
;
1093 struct file
*fl_file
;
1097 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1098 unsigned long fl_break_time
; /* for nonblocking lease breaks */
1100 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1101 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1103 struct nfs_lock_info nfs_fl
;
1104 struct nfs4_lock_info nfs4_fl
;
1106 struct list_head link
; /* link in AFS vnode's pending_locks list */
1107 int state
; /* state of grant or error if -ve */
1112 /* The following constant reflects the upper bound of the file/locking space */
1114 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1115 #define OFFSET_MAX INT_LIMIT(loff_t)
1116 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1119 #include <linux/fcntl.h>
1121 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1123 #ifdef CONFIG_FILE_LOCKING
1124 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1125 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1126 struct flock __user
*);
1128 #if BITS_PER_LONG == 32
1129 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1130 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1131 struct flock64 __user
*);
1134 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1135 extern int fcntl_getlease(struct file
*filp
);
1138 void locks_free_lock(struct file_lock
*fl
);
1139 extern void locks_init_lock(struct file_lock
*);
1140 extern struct file_lock
* locks_alloc_lock(void);
1141 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1142 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1143 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1144 extern void locks_remove_flock(struct file
*);
1145 extern void locks_release_private(struct file_lock
*);
1146 extern void posix_test_lock(struct file
*, struct file_lock
*);
1147 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1148 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1149 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1150 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1151 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1152 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1153 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1154 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1155 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1156 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1157 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1158 extern int lease_modify(struct file_lock
**, int);
1159 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1160 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1161 extern void lock_flocks(void);
1162 extern void unlock_flocks(void);
1163 #else /* !CONFIG_FILE_LOCKING */
1164 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1169 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1170 unsigned int cmd
, struct flock __user
*user
)
1175 #if BITS_PER_LONG == 32
1176 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1181 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1182 unsigned int cmd
, struct flock64 __user
*user
)
1187 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1192 static inline int fcntl_getlease(struct file
*filp
)
1197 static inline void locks_init_lock(struct file_lock
*fl
)
1202 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1207 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1212 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1217 static inline void locks_remove_flock(struct file
*filp
)
1222 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1227 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1228 struct file_lock
*conflock
)
1233 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1238 static inline int posix_unblock_lock(struct file
*filp
,
1239 struct file_lock
*waiter
)
1244 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1249 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1250 struct file_lock
*fl
, struct file_lock
*conf
)
1255 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1260 static inline int flock_lock_file_wait(struct file
*filp
,
1261 struct file_lock
*request
)
1266 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1271 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1276 static inline int generic_setlease(struct file
*filp
, long arg
,
1277 struct file_lock
**flp
)
1282 static inline int vfs_setlease(struct file
*filp
, long arg
,
1283 struct file_lock
**lease
)
1288 static inline int lease_modify(struct file_lock
**before
, int arg
)
1293 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1299 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1305 static inline void lock_flocks(void)
1309 static inline void unlock_flocks(void)
1313 #endif /* !CONFIG_FILE_LOCKING */
1316 struct fasync_struct
{
1320 struct fasync_struct
*fa_next
; /* singly linked list */
1321 struct file
*fa_file
;
1322 struct rcu_head fa_rcu
;
1325 #define FASYNC_MAGIC 0x4601
1327 /* SMP safe fasync helpers: */
1328 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1329 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1330 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1331 extern struct fasync_struct
*fasync_alloc(void);
1332 extern void fasync_free(struct fasync_struct
*);
1334 /* can be called from interrupts */
1335 extern void kill_fasync(struct fasync_struct
**, int, int);
1337 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1338 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1339 extern void f_delown(struct file
*filp
);
1340 extern pid_t
f_getown(struct file
*filp
);
1341 extern int send_sigurg(struct fown_struct
*fown
);
1347 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1348 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1349 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1350 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1351 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1353 extern struct list_head super_blocks
;
1354 extern spinlock_t sb_lock
;
1356 struct super_block
{
1357 struct list_head s_list
; /* Keep this first */
1358 dev_t s_dev
; /* search index; _not_ kdev_t */
1359 unsigned char s_dirt
;
1360 unsigned char s_blocksize_bits
;
1361 unsigned long s_blocksize
;
1362 loff_t s_maxbytes
; /* Max file size */
1363 struct file_system_type
*s_type
;
1364 const struct super_operations
*s_op
;
1365 const struct dquot_operations
*dq_op
;
1366 const struct quotactl_ops
*s_qcop
;
1367 const struct export_operations
*s_export_op
;
1368 unsigned long s_flags
;
1369 unsigned long s_magic
;
1370 struct dentry
*s_root
;
1371 struct rw_semaphore s_umount
;
1372 struct mutex s_lock
;
1375 #ifdef CONFIG_SECURITY
1378 const struct xattr_handler
**s_xattr
;
1380 struct list_head s_inodes
; /* all inodes */
1381 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1383 struct list_head __percpu
*s_files
;
1385 struct list_head s_files
;
1387 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1388 struct list_head s_dentry_lru
; /* unused dentry lru */
1389 int s_nr_dentry_unused
; /* # of dentry on lru */
1391 struct block_device
*s_bdev
;
1392 struct backing_dev_info
*s_bdi
;
1393 struct mtd_info
*s_mtd
;
1394 struct list_head s_instances
;
1395 struct quota_info s_dquot
; /* Diskquota specific options */
1398 wait_queue_head_t s_wait_unfrozen
;
1400 char s_id
[32]; /* Informational name */
1402 void *s_fs_info
; /* Filesystem private info */
1405 /* Granularity of c/m/atime in ns.
1406 Cannot be worse than a second */
1410 * The next field is for VFS *only*. No filesystems have any business
1411 * even looking at it. You had been warned.
1413 struct mutex s_vfs_rename_mutex
; /* Kludge */
1416 * Filesystem subtype. If non-empty the filesystem type field
1417 * in /proc/mounts will be "type.subtype"
1422 * Saved mount options for lazy filesystems using
1423 * generic_show_options()
1425 char __rcu
*s_options
;
1428 extern struct timespec
current_fs_time(struct super_block
*sb
);
1431 * Snapshotting support.
1435 SB_FREEZE_WRITE
= 1,
1436 SB_FREEZE_TRANS
= 2,
1439 #define vfs_check_frozen(sb, level) \
1440 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1442 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1443 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1444 #define has_fs_excl() atomic_read(¤t->fs_excl)
1446 #define is_owner_or_cap(inode) \
1447 ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
1449 /* not quite ready to be deprecated, but... */
1450 extern void lock_super(struct super_block
*);
1451 extern void unlock_super(struct super_block
*);
1454 * VFS helper functions..
1456 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
1457 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
1458 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
1459 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1460 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1461 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1462 extern int vfs_unlink(struct inode
*, struct dentry
*);
1463 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1466 * VFS dentry helper functions.
1468 extern void dentry_unhash(struct dentry
*dentry
);
1471 * VFS file helper functions.
1473 extern int file_permission(struct file
*, int);
1474 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1477 * VFS FS_IOC_FIEMAP helper definitions.
1479 struct fiemap_extent_info
{
1480 unsigned int fi_flags
; /* Flags as passed from user */
1481 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1482 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1483 struct fiemap_extent
*fi_extents_start
; /* Start of fiemap_extent
1486 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1487 u64 phys
, u64 len
, u32 flags
);
1488 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1493 * NOTE! These match bits 12..15 of stat.st_mode
1494 * (ie "(i_mode >> 12) & 15").
1496 #define DT_UNKNOWN 0
1507 * This is the "filldir" function type, used by readdir() to let
1508 * the kernel specify what kind of dirent layout it wants to have.
1509 * This allows the kernel to read directories into kernel space or
1510 * to have different dirent layouts depending on the binary type.
1512 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1513 struct block_device_operations
;
1515 /* These macros are for out of kernel modules to test that
1516 * the kernel supports the unlocked_ioctl and compat_ioctl
1517 * fields in struct file_operations. */
1518 #define HAVE_COMPAT_IOCTL 1
1519 #define HAVE_UNLOCKED_IOCTL 1
1523 * all file operations except setlease can be called without
1524 * the big kernel lock held in all filesystems.
1526 struct file_operations
{
1527 struct module
*owner
;
1528 loff_t (*llseek
) (struct file
*, loff_t
, int);
1529 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1530 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1531 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1532 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1533 int (*readdir
) (struct file
*, void *, filldir_t
);
1534 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1535 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1536 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1537 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1538 int (*open
) (struct inode
*, struct file
*);
1539 int (*flush
) (struct file
*, fl_owner_t id
);
1540 int (*release
) (struct inode
*, struct file
*);
1541 int (*fsync
) (struct file
*, int datasync
);
1542 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1543 int (*fasync
) (int, struct file
*, int);
1544 int (*lock
) (struct file
*, int, struct file_lock
*);
1545 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1546 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1547 int (*check_flags
)(int);
1548 int (*flock
) (struct file
*, int, struct file_lock
*);
1549 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1550 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1551 int (*setlease
)(struct file
*, long, struct file_lock
**);
1554 #define IPERM_FLAG_RCU 0x0001
1556 struct inode_operations
{
1557 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1558 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1559 int (*permission
) (struct inode
*, int, unsigned int);
1560 int (*check_acl
)(struct inode
*, int, unsigned int);
1562 int (*readlink
) (struct dentry
*, char __user
*,int);
1563 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1565 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1566 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1567 int (*unlink
) (struct inode
*,struct dentry
*);
1568 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1569 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1570 int (*rmdir
) (struct inode
*,struct dentry
*);
1571 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1572 int (*rename
) (struct inode
*, struct dentry
*,
1573 struct inode
*, struct dentry
*);
1574 void (*truncate
) (struct inode
*);
1575 int (*setattr
) (struct dentry
*, struct iattr
*);
1576 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1577 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1578 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1579 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1580 int (*removexattr
) (struct dentry
*, const char *);
1581 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1582 long (*fallocate
)(struct inode
*inode
, int mode
, loff_t offset
,
1584 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1586 } ____cacheline_aligned
;
1590 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1591 unsigned long nr_segs
, unsigned long fast_segs
,
1592 struct iovec
*fast_pointer
,
1593 struct iovec
**ret_pointer
);
1595 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1596 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1597 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1598 unsigned long, loff_t
*);
1599 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1600 unsigned long, loff_t
*);
1602 struct super_operations
{
1603 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1604 void (*destroy_inode
)(struct inode
*);
1606 void (*dirty_inode
) (struct inode
*);
1607 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1608 int (*drop_inode
) (struct inode
*);
1609 void (*evict_inode
) (struct inode
*);
1610 void (*put_super
) (struct super_block
*);
1611 void (*write_super
) (struct super_block
*);
1612 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1613 int (*freeze_fs
) (struct super_block
*);
1614 int (*unfreeze_fs
) (struct super_block
*);
1615 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1616 int (*remount_fs
) (struct super_block
*, int *, char *);
1617 void (*umount_begin
) (struct super_block
*);
1619 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1620 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1622 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1623 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1625 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1629 * Inode state bits. Protected by inode_lock.
1631 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1632 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1634 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1635 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1636 * various stages of removing an inode.
1638 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1640 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1641 * fdatasync(). i_atime is the usual cause.
1642 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1643 * these changes separately from I_DIRTY_SYNC so that we
1644 * don't have to write inode on fdatasync() when only
1645 * mtime has changed in it.
1646 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1647 * I_NEW Serves as both a mutex and completion notification.
1648 * New inodes set I_NEW. If two processes both create
1649 * the same inode, one of them will release its inode and
1650 * wait for I_NEW to be released before returning.
1651 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1652 * also cause waiting on I_NEW, without I_NEW actually
1653 * being set. find_inode() uses this to prevent returning
1654 * nearly-dead inodes.
1655 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1656 * is zero. I_FREEING must be set when I_WILL_FREE is
1658 * I_FREEING Set when inode is about to be freed but still has dirty
1659 * pages or buffers attached or the inode itself is still
1661 * I_CLEAR Added by end_writeback(). In this state the inode is clean
1662 * and can be destroyed. Inode keeps I_FREEING.
1664 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1665 * prohibited for many purposes. iget() must wait for
1666 * the inode to be completely released, then create it
1667 * anew. Other functions will just ignore such inodes,
1668 * if appropriate. I_NEW is used for waiting.
1670 * I_SYNC Synchonized write of dirty inode data. The bits is
1671 * set during data writeback, and cleared with a wakeup
1672 * on the bit address once it is done.
1674 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1676 #define I_DIRTY_SYNC (1 << 0)
1677 #define I_DIRTY_DATASYNC (1 << 1)
1678 #define I_DIRTY_PAGES (1 << 2)
1680 #define I_NEW (1 << __I_NEW)
1681 #define I_WILL_FREE (1 << 4)
1682 #define I_FREEING (1 << 5)
1683 #define I_CLEAR (1 << 6)
1685 #define I_SYNC (1 << __I_SYNC)
1686 #define I_REFERENCED (1 << 8)
1688 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1690 extern void __mark_inode_dirty(struct inode
*, int);
1691 static inline void mark_inode_dirty(struct inode
*inode
)
1693 __mark_inode_dirty(inode
, I_DIRTY
);
1696 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1698 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1702 * inc_nlink - directly increment an inode's link count
1705 * This is a low-level filesystem helper to replace any
1706 * direct filesystem manipulation of i_nlink. Currently,
1707 * it is only here for parity with dec_nlink().
1709 static inline void inc_nlink(struct inode
*inode
)
1714 static inline void inode_inc_link_count(struct inode
*inode
)
1717 mark_inode_dirty(inode
);
1721 * drop_nlink - directly drop an inode's link count
1724 * This is a low-level filesystem helper to replace any
1725 * direct filesystem manipulation of i_nlink. In cases
1726 * where we are attempting to track writes to the
1727 * filesystem, a decrement to zero means an imminent
1728 * write when the file is truncated and actually unlinked
1729 * on the filesystem.
1731 static inline void drop_nlink(struct inode
*inode
)
1737 * clear_nlink - directly zero an inode's link count
1740 * This is a low-level filesystem helper to replace any
1741 * direct filesystem manipulation of i_nlink. See
1742 * drop_nlink() for why we care about i_nlink hitting zero.
1744 static inline void clear_nlink(struct inode
*inode
)
1749 static inline void inode_dec_link_count(struct inode
*inode
)
1752 mark_inode_dirty(inode
);
1756 * inode_inc_iversion - increments i_version
1757 * @inode: inode that need to be updated
1759 * Every time the inode is modified, the i_version field will be incremented.
1760 * The filesystem has to be mounted with i_version flag
1763 static inline void inode_inc_iversion(struct inode
*inode
)
1765 spin_lock(&inode
->i_lock
);
1767 spin_unlock(&inode
->i_lock
);
1770 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1771 static inline void file_accessed(struct file
*file
)
1773 if (!(file
->f_flags
& O_NOATIME
))
1774 touch_atime(file
->f_path
.mnt
, file
->f_path
.dentry
);
1777 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1778 int sync_inode_metadata(struct inode
*inode
, int wait
);
1780 struct file_system_type
{
1783 int (*get_sb
) (struct file_system_type
*, int,
1784 const char *, void *, struct vfsmount
*);
1785 struct dentry
*(*mount
) (struct file_system_type
*, int,
1786 const char *, void *);
1787 void (*kill_sb
) (struct super_block
*);
1788 struct module
*owner
;
1789 struct file_system_type
* next
;
1790 struct list_head fs_supers
;
1792 struct lock_class_key s_lock_key
;
1793 struct lock_class_key s_umount_key
;
1794 struct lock_class_key s_vfs_rename_key
;
1796 struct lock_class_key i_lock_key
;
1797 struct lock_class_key i_mutex_key
;
1798 struct lock_class_key i_mutex_dir_key
;
1799 struct lock_class_key i_alloc_sem_key
;
1802 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1803 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1804 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1805 int flags
, const char *dev_name
, void *data
,
1806 int (*fill_super
)(struct super_block
*, void *, int));
1807 extern int get_sb_bdev(struct file_system_type
*fs_type
,
1808 int flags
, const char *dev_name
, void *data
,
1809 int (*fill_super
)(struct super_block
*, void *, int),
1810 struct vfsmount
*mnt
);
1811 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1812 int flags
, void *data
,
1813 int (*fill_super
)(struct super_block
*, void *, int));
1814 extern int get_sb_single(struct file_system_type
*fs_type
,
1815 int flags
, void *data
,
1816 int (*fill_super
)(struct super_block
*, void *, int),
1817 struct vfsmount
*mnt
);
1818 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1819 int flags
, void *data
,
1820 int (*fill_super
)(struct super_block
*, void *, int));
1821 extern int get_sb_nodev(struct file_system_type
*fs_type
,
1822 int flags
, void *data
,
1823 int (*fill_super
)(struct super_block
*, void *, int),
1824 struct vfsmount
*mnt
);
1825 void generic_shutdown_super(struct super_block
*sb
);
1826 void kill_block_super(struct super_block
*sb
);
1827 void kill_anon_super(struct super_block
*sb
);
1828 void kill_litter_super(struct super_block
*sb
);
1829 void deactivate_super(struct super_block
*sb
);
1830 void deactivate_locked_super(struct super_block
*sb
);
1831 int set_anon_super(struct super_block
*s
, void *data
);
1832 struct super_block
*sget(struct file_system_type
*type
,
1833 int (*test
)(struct super_block
*,void *),
1834 int (*set
)(struct super_block
*,void *),
1836 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1837 const struct super_operations
*ops
, unsigned long);
1838 extern void simple_set_mnt(struct vfsmount
*mnt
, struct super_block
*sb
);
1840 static inline void sb_mark_dirty(struct super_block
*sb
)
1844 static inline void sb_mark_clean(struct super_block
*sb
)
1848 static inline int sb_is_dirty(struct super_block
*sb
)
1853 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1854 #define fops_get(fops) \
1855 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1856 #define fops_put(fops) \
1857 do { if (fops) module_put((fops)->owner); } while(0)
1859 extern int register_filesystem(struct file_system_type
*);
1860 extern int unregister_filesystem(struct file_system_type
*);
1861 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1862 #define kern_mount(type) kern_mount_data(type, NULL)
1863 extern int may_umount_tree(struct vfsmount
*);
1864 extern int may_umount(struct vfsmount
*);
1865 extern long do_mount(char *, char *, char *, unsigned long, void *);
1866 extern struct vfsmount
*collect_mounts(struct path
*);
1867 extern void drop_collected_mounts(struct vfsmount
*);
1868 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1870 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1871 extern int statfs_by_dentry(struct dentry
*, struct kstatfs
*);
1872 extern int freeze_super(struct super_block
*super
);
1873 extern int thaw_super(struct super_block
*super
);
1875 extern int current_umask(void);
1878 extern struct kobject
*fs_kobj
;
1880 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1881 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1883 #define FLOCK_VERIFY_READ 1
1884 #define FLOCK_VERIFY_WRITE 2
1886 #ifdef CONFIG_FILE_LOCKING
1887 extern int locks_mandatory_locked(struct inode
*);
1888 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1891 * Candidates for mandatory locking have the setgid bit set
1892 * but no group execute bit - an otherwise meaningless combination.
1895 static inline int __mandatory_lock(struct inode
*ino
)
1897 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1901 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1902 * otherwise these will be advisory locks
1905 static inline int mandatory_lock(struct inode
*ino
)
1907 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1910 static inline int locks_verify_locked(struct inode
*inode
)
1912 if (mandatory_lock(inode
))
1913 return locks_mandatory_locked(inode
);
1917 static inline int locks_verify_truncate(struct inode
*inode
,
1921 if (inode
->i_flock
&& mandatory_lock(inode
))
1922 return locks_mandatory_area(
1923 FLOCK_VERIFY_WRITE
, inode
, filp
,
1924 size
< inode
->i_size
? size
: inode
->i_size
,
1925 (size
< inode
->i_size
? inode
->i_size
- size
1926 : size
- inode
->i_size
)
1931 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1934 return __break_lease(inode
, mode
);
1937 #else /* !CONFIG_FILE_LOCKING */
1938 static inline int locks_mandatory_locked(struct inode
*inode
)
1943 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
1944 struct file
*filp
, loff_t offset
,
1950 static inline int __mandatory_lock(struct inode
*inode
)
1955 static inline int mandatory_lock(struct inode
*inode
)
1960 static inline int locks_verify_locked(struct inode
*inode
)
1965 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
1971 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1976 #endif /* CONFIG_FILE_LOCKING */
1980 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
1982 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
1984 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
1986 extern struct file
*filp_open(const char *, int, int);
1987 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
1988 const struct cred
*);
1989 extern int filp_close(struct file
*, fl_owner_t id
);
1990 extern char * getname(const char __user
*);
1994 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
1997 extern void __init
vfs_caches_init_early(void);
1998 extern void __init
vfs_caches_init(unsigned long);
2000 extern struct kmem_cache
*names_cachep
;
2002 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2003 #define __getname() __getname_gfp(GFP_KERNEL)
2004 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2005 #ifndef CONFIG_AUDITSYSCALL
2006 #define putname(name) __putname(name)
2008 extern void putname(const char *name
);
2012 extern int register_blkdev(unsigned int, const char *);
2013 extern void unregister_blkdev(unsigned int, const char *);
2014 extern struct block_device
*bdget(dev_t
);
2015 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2016 extern void bd_set_size(struct block_device
*, loff_t size
);
2017 extern void bd_forget(struct inode
*inode
);
2018 extern void bdput(struct block_device
*);
2019 extern struct block_device
*open_by_devnum(dev_t
, fmode_t
);
2020 extern void invalidate_bdev(struct block_device
*);
2021 extern int sync_blockdev(struct block_device
*bdev
);
2022 extern struct super_block
*freeze_bdev(struct block_device
*);
2023 extern void emergency_thaw_all(void);
2024 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2025 extern int fsync_bdev(struct block_device
*);
2027 static inline void bd_forget(struct inode
*inode
) {}
2028 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2029 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2031 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2036 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2041 extern int sync_filesystem(struct super_block
*);
2042 extern const struct file_operations def_blk_fops
;
2043 extern const struct file_operations def_chr_fops
;
2044 extern const struct file_operations bad_sock_fops
;
2045 extern const struct file_operations def_fifo_fops
;
2047 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2048 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2049 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2050 extern int blkdev_get(struct block_device
*, fmode_t
);
2051 extern int blkdev_put(struct block_device
*, fmode_t
);
2052 extern int bd_claim(struct block_device
*, void *);
2053 extern void bd_release(struct block_device
*);
2055 extern int bd_claim_by_disk(struct block_device
*, void *, struct gendisk
*);
2056 extern void bd_release_from_disk(struct block_device
*, struct gendisk
*);
2058 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
2059 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
2064 #define CHRDEV_MAJOR_HASH_SIZE 255
2065 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2066 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2067 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2068 unsigned int count
, const char *name
,
2069 const struct file_operations
*fops
);
2070 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2071 unsigned int count
, const char *name
);
2072 extern void unregister_chrdev_region(dev_t
, unsigned);
2073 extern void chrdev_show(struct seq_file
*,off_t
);
2075 static inline int register_chrdev(unsigned int major
, const char *name
,
2076 const struct file_operations
*fops
)
2078 return __register_chrdev(major
, 0, 256, name
, fops
);
2081 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2083 __unregister_chrdev(major
, 0, 256, name
);
2086 /* fs/block_dev.c */
2087 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2088 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2091 #define BLKDEV_MAJOR_HASH_SIZE 255
2092 extern const char *__bdevname(dev_t
, char *buffer
);
2093 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2094 extern struct block_device
*lookup_bdev(const char *);
2095 extern struct block_device
*open_bdev_exclusive(const char *, fmode_t
, void *);
2096 extern void close_bdev_exclusive(struct block_device
*, fmode_t
);
2097 extern void blkdev_show(struct seq_file
*,off_t
);
2100 #define BLKDEV_MAJOR_HASH_SIZE 0
2103 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2105 /* Invalid inode operations -- fs/bad_inode.c */
2106 extern void make_bad_inode(struct inode
*);
2107 extern int is_bad_inode(struct inode
*);
2109 extern const struct file_operations read_pipefifo_fops
;
2110 extern const struct file_operations write_pipefifo_fops
;
2111 extern const struct file_operations rdwr_pipefifo_fops
;
2113 extern int fs_may_remount_ro(struct super_block
*);
2117 * return READ, READA, or WRITE
2119 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2122 * return data direction, READ or WRITE
2124 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2126 extern void check_disk_size_change(struct gendisk
*disk
,
2127 struct block_device
*bdev
);
2128 extern int revalidate_disk(struct gendisk
*);
2129 extern int check_disk_change(struct block_device
*);
2130 extern int __invalidate_device(struct block_device
*);
2131 extern int invalidate_partition(struct gendisk
*, int);
2133 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2134 pgoff_t start
, pgoff_t end
);
2136 static inline void invalidate_remote_inode(struct inode
*inode
)
2138 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2139 S_ISLNK(inode
->i_mode
))
2140 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2142 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2143 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2144 pgoff_t start
, pgoff_t end
);
2145 extern int write_inode_now(struct inode
*, int);
2146 extern int filemap_fdatawrite(struct address_space
*);
2147 extern int filemap_flush(struct address_space
*);
2148 extern int filemap_fdatawait(struct address_space
*);
2149 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2151 extern int filemap_write_and_wait(struct address_space
*mapping
);
2152 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2153 loff_t lstart
, loff_t lend
);
2154 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2155 loff_t start
, loff_t end
, int sync_mode
);
2156 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2157 loff_t start
, loff_t end
);
2159 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2161 extern int vfs_fsync(struct file
*file
, int datasync
);
2162 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2163 extern void sync_supers(void);
2164 extern void emergency_sync(void);
2165 extern void emergency_remount(void);
2167 extern sector_t
bmap(struct inode
*, sector_t
);
2169 extern int notify_change(struct dentry
*, struct iattr
*);
2170 extern int inode_permission(struct inode
*, int);
2171 extern int generic_permission(struct inode
*, int, unsigned int,
2172 int (*check_acl
)(struct inode
*, int, unsigned int));
2174 static inline bool execute_ok(struct inode
*inode
)
2176 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2179 extern int get_write_access(struct inode
*);
2180 extern int deny_write_access(struct file
*);
2181 static inline void put_write_access(struct inode
* inode
)
2183 atomic_dec(&inode
->i_writecount
);
2185 static inline void allow_write_access(struct file
*file
)
2188 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2190 extern int do_pipe_flags(int *, int);
2191 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2192 extern struct file
*create_write_pipe(int flags
);
2193 extern void free_write_pipe(struct file
*);
2195 extern struct file
*do_filp_open(int dfd
, const char *pathname
,
2196 int open_flag
, int mode
, int acc_mode
);
2197 extern int may_open(struct path
*, int, int);
2199 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2200 extern struct file
* open_exec(const char *);
2202 /* fs/dcache.c -- generic fs support functions */
2203 extern int is_subdir(struct dentry
*, struct dentry
*);
2204 extern int path_is_under(struct path
*, struct path
*);
2205 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2207 #include <linux/err.h>
2209 /* needed for stackable file system support */
2210 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2212 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2214 extern int inode_init_always(struct super_block
*, struct inode
*);
2215 extern void inode_init_once(struct inode
*);
2216 extern void ihold(struct inode
* inode
);
2217 extern void iput(struct inode
*);
2218 extern struct inode
* igrab(struct inode
*);
2219 extern ino_t
iunique(struct super_block
*, ino_t
);
2220 extern int inode_needs_sync(struct inode
*inode
);
2221 extern int generic_delete_inode(struct inode
*inode
);
2222 extern int generic_drop_inode(struct inode
*inode
);
2224 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2225 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2227 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2228 int (*test
)(struct inode
*, void *), void *data
);
2229 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2231 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2232 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2233 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2234 extern int insert_inode_locked(struct inode
*);
2235 extern void unlock_new_inode(struct inode
*);
2236 extern unsigned int get_next_ino(void);
2238 extern void __iget(struct inode
* inode
);
2239 extern void iget_failed(struct inode
*);
2240 extern void end_writeback(struct inode
*);
2241 extern void __destroy_inode(struct inode
*);
2242 extern struct inode
*new_inode(struct super_block
*);
2243 extern void free_inode_nonrcu(struct inode
*inode
);
2244 extern int should_remove_suid(struct dentry
*);
2245 extern int file_remove_suid(struct file
*);
2247 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2248 extern void remove_inode_hash(struct inode
*);
2249 static inline void insert_inode_hash(struct inode
*inode
)
2251 __insert_inode_hash(inode
, inode
->i_ino
);
2253 extern void inode_sb_list_add(struct inode
*inode
);
2256 extern void submit_bio(int, struct bio
*);
2257 extern int bdev_read_only(struct block_device
*);
2259 extern int set_blocksize(struct block_device
*, int);
2260 extern int sb_set_blocksize(struct super_block
*, int);
2261 extern int sb_min_blocksize(struct super_block
*, int);
2263 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2264 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2265 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2266 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2267 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2268 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2270 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2271 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2272 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2273 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2274 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2275 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2276 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2277 extern int generic_segment_checks(const struct iovec
*iov
,
2278 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2280 /* fs/block_dev.c */
2281 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2282 unsigned long nr_segs
, loff_t pos
);
2283 extern int blkdev_fsync(struct file
*filp
, int datasync
);
2286 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2287 struct pipe_inode_info
*, size_t, unsigned int);
2288 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2289 struct pipe_inode_info
*, size_t, unsigned int);
2290 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2291 struct file
*, loff_t
*, size_t, unsigned int);
2292 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2293 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2294 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2295 size_t len
, unsigned int flags
);
2298 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2299 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2300 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2301 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2302 extern loff_t
generic_file_llseek_unlocked(struct file
*file
, loff_t offset
,
2304 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2305 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2307 #ifdef CONFIG_FS_XIP
2308 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2310 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2311 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2312 size_t len
, loff_t
*ppos
);
2313 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2315 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2322 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2323 loff_t file_offset
);
2326 /* need locking between buffered and direct access */
2329 /* filesystem does not support filling holes */
2330 DIO_SKIP_HOLES
= 0x02,
2333 void dio_end_io(struct bio
*bio
, int error
);
2335 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2336 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2337 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2338 dio_submit_t submit_io
, int flags
);
2340 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2341 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
2342 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
2343 dio_iodone_t end_io
)
2345 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
2346 nr_segs
, get_block
, end_io
, NULL
,
2347 DIO_LOCKING
| DIO_SKIP_HOLES
);
2351 extern const struct file_operations generic_ro_fops
;
2353 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2355 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2356 extern int vfs_follow_link(struct nameidata
*, const char *);
2357 extern int page_readlink(struct dentry
*, char __user
*, int);
2358 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2359 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2360 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2362 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2363 extern const struct inode_operations page_symlink_inode_operations
;
2364 extern int generic_readlink(struct dentry
*, char __user
*, int);
2365 extern void generic_fillattr(struct inode
*, struct kstat
*);
2366 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2367 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2368 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2369 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2370 loff_t
inode_get_bytes(struct inode
*inode
);
2371 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2373 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2375 extern int vfs_stat(const char __user
*, struct kstat
*);
2376 extern int vfs_lstat(const char __user
*, struct kstat
*);
2377 extern int vfs_fstat(unsigned int, struct kstat
*);
2378 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2380 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2382 extern int __generic_block_fiemap(struct inode
*inode
,
2383 struct fiemap_extent_info
*fieinfo
,
2384 loff_t start
, loff_t len
,
2385 get_block_t
*get_block
);
2386 extern int generic_block_fiemap(struct inode
*inode
,
2387 struct fiemap_extent_info
*fieinfo
, u64 start
,
2388 u64 len
, get_block_t
*get_block
);
2390 extern void get_filesystem(struct file_system_type
*fs
);
2391 extern void put_filesystem(struct file_system_type
*fs
);
2392 extern struct file_system_type
*get_fs_type(const char *name
);
2393 extern struct super_block
*get_super(struct block_device
*);
2394 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2395 extern struct super_block
*user_get_super(dev_t
);
2396 extern void drop_super(struct super_block
*sb
);
2397 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2399 extern int dcache_dir_open(struct inode
*, struct file
*);
2400 extern int dcache_dir_close(struct inode
*, struct file
*);
2401 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2402 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2403 extern int simple_setattr(struct dentry
*, struct iattr
*);
2404 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2405 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2406 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2407 extern int simple_unlink(struct inode
*, struct dentry
*);
2408 extern int simple_rmdir(struct inode
*, struct dentry
*);
2409 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2410 extern int noop_fsync(struct file
*, int);
2411 extern int simple_empty(struct dentry
*);
2412 extern int simple_readpage(struct file
*file
, struct page
*page
);
2413 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2414 loff_t pos
, unsigned len
, unsigned flags
,
2415 struct page
**pagep
, void **fsdata
);
2416 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2417 loff_t pos
, unsigned len
, unsigned copied
,
2418 struct page
*page
, void *fsdata
);
2420 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2421 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2422 extern const struct file_operations simple_dir_operations
;
2423 extern const struct inode_operations simple_dir_inode_operations
;
2424 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2425 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2426 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2427 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2428 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2430 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2431 loff_t
*ppos
, const void *from
, size_t available
);
2432 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2433 const void __user
*from
, size_t count
);
2435 extern int generic_file_fsync(struct file
*, int);
2437 extern int generic_check_addressable(unsigned, u64
);
2439 #ifdef CONFIG_MIGRATION
2440 extern int buffer_migrate_page(struct address_space
*,
2441 struct page
*, struct page
*);
2443 #define buffer_migrate_page NULL
2446 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2447 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2448 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2450 extern void file_update_time(struct file
*file
);
2452 extern int generic_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
2453 extern void save_mount_options(struct super_block
*sb
, char *options
);
2454 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2456 static inline ino_t
parent_ino(struct dentry
*dentry
)
2461 * Don't strictly need d_lock here? If the parent ino could change
2462 * then surely we'd have a deeper race in the caller?
2464 spin_lock(&dentry
->d_lock
);
2465 res
= dentry
->d_parent
->d_inode
->i_ino
;
2466 spin_unlock(&dentry
->d_lock
);
2470 /* Transaction based IO helpers */
2473 * An argresp is stored in an allocated page and holds the
2474 * size of the argument or response, along with its content
2476 struct simple_transaction_argresp
{
2481 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2483 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2485 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2486 size_t size
, loff_t
*pos
);
2487 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2489 void simple_transaction_set(struct file
*file
, size_t n
);
2492 * simple attribute files
2494 * These attributes behave similar to those in sysfs:
2496 * Writing to an attribute immediately sets a value, an open file can be
2497 * written to multiple times.
2499 * Reading from an attribute creates a buffer from the value that might get
2500 * read with multiple read calls. When the attribute has been read
2501 * completely, no further read calls are possible until the file is opened
2504 * All attributes contain a text representation of a numeric value
2505 * that are accessed with the get() and set() functions.
2507 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2508 static int __fops ## _open(struct inode *inode, struct file *file) \
2510 __simple_attr_check_format(__fmt, 0ull); \
2511 return simple_attr_open(inode, file, __get, __set, __fmt); \
2513 static const struct file_operations __fops = { \
2514 .owner = THIS_MODULE, \
2515 .open = __fops ## _open, \
2516 .release = simple_attr_release, \
2517 .read = simple_attr_read, \
2518 .write = simple_attr_write, \
2519 .llseek = generic_file_llseek, \
2522 static inline void __attribute__((format(printf
, 1, 2)))
2523 __simple_attr_check_format(const char *fmt
, ...)
2525 /* don't do anything, just let the compiler check the arguments; */
2528 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2529 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2531 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2532 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2533 size_t len
, loff_t
*ppos
);
2534 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2535 size_t len
, loff_t
*ppos
);
2538 int proc_nr_files(struct ctl_table
*table
, int write
,
2539 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2540 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2541 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2542 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2543 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2544 int __init
get_filesystem_list(char *buf
);
2546 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2547 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2548 (flag & FMODE_NONOTIFY)))
2550 #endif /* __KERNEL__ */
2551 #endif /* _LINUX_FS_H */