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 is opened with O_PATH; almost nothing can be done with it */
106 #define FMODE_PATH ((__force fmode_t)0x4000)
108 /* File was opened by fanotify and shouldn't generate fanotify events */
109 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
112 * The below are the various read and write types that we support. Some of
113 * them include behavioral modifiers that send information down to the
114 * block layer and IO scheduler. Terminology:
116 * The block layer uses device plugging to defer IO a little bit, in
117 * the hope that we will see more IO very shortly. This increases
118 * coalescing of adjacent IO and thus reduces the number of IOs we
119 * have to send to the device. It also allows for better queuing,
120 * if the IO isn't mergeable. If the caller is going to be waiting
121 * for the IO, then he must ensure that the device is unplugged so
122 * that the IO is dispatched to the driver.
124 * All IO is handled async in Linux. This is fine for background
125 * writes, but for reads or writes that someone waits for completion
126 * on, we want to notify the block layer and IO scheduler so that they
127 * know about it. That allows them to make better scheduling
128 * decisions. So when the below references 'sync' and 'async', it
129 * is referencing this priority hint.
131 * With that in mind, the available types are:
133 * READ A normal read operation. Device will be plugged.
134 * READ_SYNC A synchronous read. Device is not plugged, caller can
135 * immediately wait on this read without caring about
137 * READA Used for read-ahead operations. Lower priority, and the
138 * block layer could (in theory) choose to ignore this
139 * request if it runs into resource problems.
140 * WRITE A normal async write. Device will be plugged.
141 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
142 * the hint that someone will be waiting on this IO
143 * shortly. The write equivalent of READ_SYNC.
144 * WRITE_ODIRECT Special case write for O_DIRECT only.
145 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
146 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
147 * non-volatile media on completion.
148 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
149 * by a cache flush and data is guaranteed to be on
150 * non-volatile media on completion.
153 #define RW_MASK REQ_WRITE
154 #define RWA_MASK REQ_RAHEAD
157 #define WRITE RW_MASK
158 #define READA RWA_MASK
160 #define READ_SYNC (READ | REQ_SYNC)
161 #define READ_META (READ | REQ_META)
162 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
163 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
164 #define WRITE_META (WRITE | REQ_META)
165 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
166 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
167 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
173 /* public flags for file_system_type */
174 #define FS_REQUIRES_DEV 1
175 #define FS_BINARY_MOUNTDATA 2
176 #define FS_HAS_SUBTYPE 4
177 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
178 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
179 * during rename() internally.
183 * These are the fs-independent mount-flags: up to 32 flags are supported
185 #define MS_RDONLY 1 /* Mount read-only */
186 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
187 #define MS_NODEV 4 /* Disallow access to device special files */
188 #define MS_NOEXEC 8 /* Disallow program execution */
189 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
190 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
191 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
192 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
193 #define MS_NOATIME 1024 /* Do not update access times. */
194 #define MS_NODIRATIME 2048 /* Do not update directory access times */
198 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
199 MS_VERBOSE is deprecated. */
200 #define MS_SILENT 32768
201 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
202 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
203 #define MS_PRIVATE (1<<18) /* change to private */
204 #define MS_SLAVE (1<<19) /* change to slave */
205 #define MS_SHARED (1<<20) /* change to shared */
206 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
207 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
208 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
209 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
210 #define MS_BORN (1<<29)
211 #define MS_ACTIVE (1<<30)
212 #define MS_NOUSER (1<<31)
215 * Superblock flags that can be altered by MS_REMOUNT
217 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
220 * Old magic mount flag and mask
222 #define MS_MGC_VAL 0xC0ED0000
223 #define MS_MGC_MSK 0xffff0000
225 /* Inode flags - they have nothing to superblock flags now */
227 #define S_SYNC 1 /* Writes are synced at once */
228 #define S_NOATIME 2 /* Do not update access times */
229 #define S_APPEND 4 /* Append-only file */
230 #define S_IMMUTABLE 8 /* Immutable file */
231 #define S_DEAD 16 /* removed, but still open directory */
232 #define S_NOQUOTA 32 /* Inode is not counted to quota */
233 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
234 #define S_NOCMTIME 128 /* Do not update file c/mtime */
235 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
236 #define S_PRIVATE 512 /* Inode is fs-internal */
237 #define S_IMA 1024 /* Inode has an associated IMA struct */
238 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
241 * Note that nosuid etc flags are inode-specific: setting some file-system
242 * flags just means all the inodes inherit those flags by default. It might be
243 * possible to override it selectively if you really wanted to with some
244 * ioctl() that is not currently implemented.
246 * Exception: MS_RDONLY is always applied to the entire file system.
248 * Unfortunately, it is possible to change a filesystems flags with it mounted
249 * with files in use. This means that all of the inodes will not have their
250 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
251 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
253 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
255 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
256 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
257 ((inode)->i_flags & S_SYNC))
258 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
259 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
260 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
261 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
262 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
264 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
265 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
266 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
267 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
269 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
270 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
271 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
272 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
273 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
274 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
276 /* the read-only stuff doesn't really belong here, but any other place is
277 probably as bad and I don't want to create yet another include file. */
279 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
280 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
281 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
282 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
283 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
284 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
285 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
286 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
287 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
288 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
289 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
290 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
292 #define BLKPG _IO(0x12,105)/* See blkpg.h */
294 /* Some people are morons. Do not use sizeof! */
296 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
297 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
298 /* This was here just to show that the number is taken -
299 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
301 /* A jump here: 108-111 have been used for various private purposes. */
302 #define BLKBSZGET _IOR(0x12,112,size_t)
303 #define BLKBSZSET _IOW(0x12,113,size_t)
304 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
305 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
306 #define BLKTRACESTART _IO(0x12,116)
307 #define BLKTRACESTOP _IO(0x12,117)
308 #define BLKTRACETEARDOWN _IO(0x12,118)
309 #define BLKDISCARD _IO(0x12,119)
310 #define BLKIOMIN _IO(0x12,120)
311 #define BLKIOOPT _IO(0x12,121)
312 #define BLKALIGNOFF _IO(0x12,122)
313 #define BLKPBSZGET _IO(0x12,123)
314 #define BLKDISCARDZEROES _IO(0x12,124)
315 #define BLKSECDISCARD _IO(0x12,125)
317 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
318 #define FIBMAP _IO(0x00,1) /* bmap access */
319 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
320 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
321 #define FITHAW _IOWR('X', 120, int) /* Thaw */
322 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
324 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
325 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
326 #define FS_IOC_GETVERSION _IOR('v', 1, long)
327 #define FS_IOC_SETVERSION _IOW('v', 2, long)
328 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
329 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
330 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
331 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
332 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
335 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
337 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
338 #define FS_UNRM_FL 0x00000002 /* Undelete */
339 #define FS_COMPR_FL 0x00000004 /* Compress file */
340 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
341 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
342 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
343 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
344 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
345 /* Reserved for compression usage... */
346 #define FS_DIRTY_FL 0x00000100
347 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
348 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
349 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
350 /* End compression flags --- maybe not all used */
351 #define FS_BTREE_FL 0x00001000 /* btree format dir */
352 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
353 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
354 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
355 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
356 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
357 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
358 #define FS_EXTENT_FL 0x00080000 /* Extents */
359 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
360 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
361 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
363 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
364 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
367 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
368 #define SYNC_FILE_RANGE_WRITE 2
369 #define SYNC_FILE_RANGE_WAIT_AFTER 4
373 #include <linux/linkage.h>
374 #include <linux/wait.h>
375 #include <linux/types.h>
376 #include <linux/kdev_t.h>
377 #include <linux/dcache.h>
378 #include <linux/path.h>
379 #include <linux/stat.h>
380 #include <linux/cache.h>
381 #include <linux/list.h>
382 #include <linux/radix-tree.h>
383 #include <linux/prio_tree.h>
384 #include <linux/init.h>
385 #include <linux/pid.h>
386 #include <linux/mutex.h>
387 #include <linux/capability.h>
388 #include <linux/semaphore.h>
389 #include <linux/fiemap.h>
390 #include <linux/rculist_bl.h>
392 #include <asm/atomic.h>
393 #include <asm/byteorder.h>
395 struct export_operations
;
401 struct pipe_inode_info
;
402 struct poll_table_struct
;
404 struct vm_area_struct
;
408 extern void __init
inode_init(void);
409 extern void __init
inode_init_early(void);
410 extern void __init
files_init(unsigned long);
412 extern struct files_stat_struct files_stat
;
413 extern unsigned long get_max_files(void);
414 extern int sysctl_nr_open
;
415 extern struct inodes_stat_t inodes_stat
;
416 extern int leases_enable
, lease_break_time
;
419 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
420 struct buffer_head
*bh_result
, int create
);
421 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
422 ssize_t bytes
, void *private, int ret
,
426 * Attribute flags. These should be or-ed together to figure out what
429 #define ATTR_MODE (1 << 0)
430 #define ATTR_UID (1 << 1)
431 #define ATTR_GID (1 << 2)
432 #define ATTR_SIZE (1 << 3)
433 #define ATTR_ATIME (1 << 4)
434 #define ATTR_MTIME (1 << 5)
435 #define ATTR_CTIME (1 << 6)
436 #define ATTR_ATIME_SET (1 << 7)
437 #define ATTR_MTIME_SET (1 << 8)
438 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
439 #define ATTR_ATTR_FLAG (1 << 10)
440 #define ATTR_KILL_SUID (1 << 11)
441 #define ATTR_KILL_SGID (1 << 12)
442 #define ATTR_FILE (1 << 13)
443 #define ATTR_KILL_PRIV (1 << 14)
444 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
445 #define ATTR_TIMES_SET (1 << 16)
448 * This is the Inode Attributes structure, used for notify_change(). It
449 * uses the above definitions as flags, to know which values have changed.
450 * Also, in this manner, a Filesystem can look at only the values it cares
451 * about. Basically, these are the attributes that the VFS layer can
452 * request to change from the FS layer.
454 * Derek Atkins <warlord@MIT.EDU> 94-10-20
457 unsigned int ia_valid
;
462 struct timespec ia_atime
;
463 struct timespec ia_mtime
;
464 struct timespec ia_ctime
;
467 * Not an attribute, but an auxiliary info for filesystems wanting to
468 * implement an ftruncate() like method. NOTE: filesystem should
469 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
471 struct file
*ia_file
;
475 * Includes for diskquotas.
477 #include <linux/quota.h>
480 * enum positive_aop_returns - aop return codes with specific semantics
482 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
483 * completed, that the page is still locked, and
484 * should be considered active. The VM uses this hint
485 * to return the page to the active list -- it won't
486 * be a candidate for writeback again in the near
487 * future. Other callers must be careful to unlock
488 * the page if they get this return. Returned by
491 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
492 * unlocked it and the page might have been truncated.
493 * The caller should back up to acquiring a new page and
494 * trying again. The aop will be taking reasonable
495 * precautions not to livelock. If the caller held a page
496 * reference, it should drop it before retrying. Returned
499 * address_space_operation functions return these large constants to indicate
500 * special semantics to the caller. These are much larger than the bytes in a
501 * page to allow for functions that return the number of bytes operated on in a
505 enum positive_aop_returns
{
506 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
507 AOP_TRUNCATED_PAGE
= 0x80001,
510 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
511 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
512 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
513 * helper code (eg buffer layer)
514 * to clear GFP_FS from alloc */
517 * oh the beauties of C type declarations.
520 struct address_space
;
521 struct writeback_control
;
524 const struct iovec
*iov
;
525 unsigned long nr_segs
;
530 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
531 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
532 size_t iov_iter_copy_from_user(struct page
*page
,
533 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
534 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
535 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
536 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
538 static inline void iov_iter_init(struct iov_iter
*i
,
539 const struct iovec
*iov
, unsigned long nr_segs
,
540 size_t count
, size_t written
)
543 i
->nr_segs
= nr_segs
;
545 i
->count
= count
+ written
;
547 iov_iter_advance(i
, written
);
550 static inline size_t iov_iter_count(struct iov_iter
*i
)
556 * "descriptor" for what we're up to with a read.
557 * This allows us to use the same read code yet
558 * have multiple different users of the data that
559 * we read from a file.
561 * The simplest case just copies the data to user
574 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
575 unsigned long, unsigned long);
577 struct address_space_operations
{
578 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
579 int (*readpage
)(struct file
*, struct page
*);
581 /* Write back some dirty pages from this mapping. */
582 int (*writepages
)(struct address_space
*, struct writeback_control
*);
584 /* Set a page dirty. Return true if this dirtied it */
585 int (*set_page_dirty
)(struct page
*page
);
587 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
588 struct list_head
*pages
, unsigned nr_pages
);
590 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
591 loff_t pos
, unsigned len
, unsigned flags
,
592 struct page
**pagep
, void **fsdata
);
593 int (*write_end
)(struct file
*, struct address_space
*mapping
,
594 loff_t pos
, unsigned len
, unsigned copied
,
595 struct page
*page
, void *fsdata
);
597 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
598 sector_t (*bmap
)(struct address_space
*, sector_t
);
599 void (*invalidatepage
) (struct page
*, unsigned long);
600 int (*releasepage
) (struct page
*, gfp_t
);
601 void (*freepage
)(struct page
*);
602 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
603 loff_t offset
, unsigned long nr_segs
);
604 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
605 void **, unsigned long *);
606 /* migrate the contents of a page to the specified target */
607 int (*migratepage
) (struct address_space
*,
608 struct page
*, struct page
*);
609 int (*launder_page
) (struct page
*);
610 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
612 int (*error_remove_page
)(struct address_space
*, struct page
*);
615 extern const struct address_space_operations empty_aops
;
618 * pagecache_write_begin/pagecache_write_end must be used by general code
619 * to write into the pagecache.
621 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
622 loff_t pos
, unsigned len
, unsigned flags
,
623 struct page
**pagep
, void **fsdata
);
625 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
626 loff_t pos
, unsigned len
, unsigned copied
,
627 struct page
*page
, void *fsdata
);
629 struct backing_dev_info
;
630 struct address_space
{
631 struct inode
*host
; /* owner: inode, block_device */
632 struct radix_tree_root page_tree
; /* radix tree of all pages */
633 spinlock_t tree_lock
; /* and lock protecting it */
634 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
635 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
636 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
637 struct mutex i_mmap_mutex
; /* protect tree, count, list */
638 unsigned long nrpages
; /* number of total pages */
639 pgoff_t writeback_index
;/* writeback starts here */
640 const struct address_space_operations
*a_ops
; /* methods */
641 unsigned long flags
; /* error bits/gfp mask */
642 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
643 spinlock_t private_lock
; /* for use by the address_space */
644 struct list_head private_list
; /* ditto */
645 struct address_space
*assoc_mapping
; /* ditto */
646 } __attribute__((aligned(sizeof(long))));
648 * On most architectures that alignment is already the case; but
649 * must be enforced here for CRIS, to let the least significant bit
650 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
653 struct block_device
{
654 dev_t bd_dev
; /* not a kdev_t - it's a search key */
656 struct inode
* bd_inode
; /* will die */
657 struct super_block
* bd_super
;
658 struct mutex bd_mutex
; /* open/close mutex */
659 struct list_head bd_inodes
;
663 bool bd_write_holder
;
665 struct list_head bd_holder_disks
;
667 struct block_device
* bd_contains
;
668 unsigned bd_block_size
;
669 struct hd_struct
* bd_part
;
670 /* number of times partitions within this device have been opened. */
671 unsigned bd_part_count
;
673 struct gendisk
* bd_disk
;
674 struct list_head bd_list
;
676 * Private data. You must have bd_claim'ed the block_device
677 * to use this. NOTE: bd_claim allows an owner to claim
678 * the same device multiple times, the owner must take special
679 * care to not mess up bd_private for that case.
681 unsigned long bd_private
;
683 /* The counter of freeze processes */
684 int bd_fsfreeze_count
;
685 /* Mutex for freeze */
686 struct mutex bd_fsfreeze_mutex
;
690 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
693 #define PAGECACHE_TAG_DIRTY 0
694 #define PAGECACHE_TAG_WRITEBACK 1
695 #define PAGECACHE_TAG_TOWRITE 2
697 int mapping_tagged(struct address_space
*mapping
, int tag
);
700 * Might pages of this file be mapped into userspace?
702 static inline int mapping_mapped(struct address_space
*mapping
)
704 return !prio_tree_empty(&mapping
->i_mmap
) ||
705 !list_empty(&mapping
->i_mmap_nonlinear
);
709 * Might pages of this file have been modified in userspace?
710 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
711 * marks vma as VM_SHARED if it is shared, and the file was opened for
712 * writing i.e. vma may be mprotected writable even if now readonly.
714 static inline int mapping_writably_mapped(struct address_space
*mapping
)
716 return mapping
->i_mmap_writable
!= 0;
720 * Use sequence counter to get consistent i_size on 32-bit processors.
722 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
723 #include <linux/seqlock.h>
724 #define __NEED_I_SIZE_ORDERED
725 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
727 #define i_size_ordered_init(inode) do { } while (0)
731 #define ACL_NOT_CACHED ((void *)(-1))
734 /* RCU path lookup touches following: */
738 const struct inode_operations
*i_op
;
739 struct super_block
*i_sb
;
741 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
742 unsigned int i_flags
;
743 struct mutex i_mutex
;
745 unsigned long i_state
;
746 unsigned long dirtied_when
; /* jiffies of first dirtying */
748 struct hlist_node i_hash
;
749 struct list_head i_wb_list
; /* backing dev IO list */
750 struct list_head i_lru
; /* inode LRU list */
751 struct list_head i_sb_list
;
753 struct list_head i_dentry
;
754 struct rcu_head i_rcu
;
758 unsigned int i_nlink
;
760 unsigned int i_blkbits
;
763 #ifdef __NEED_I_SIZE_ORDERED
764 seqcount_t i_size_seqcount
;
766 struct timespec i_atime
;
767 struct timespec i_mtime
;
768 struct timespec i_ctime
;
770 unsigned short i_bytes
;
771 struct rw_semaphore i_alloc_sem
;
772 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
773 struct file_lock
*i_flock
;
774 struct address_space
*i_mapping
;
775 struct address_space i_data
;
777 struct dquot
*i_dquot
[MAXQUOTAS
];
779 struct list_head i_devices
;
781 struct pipe_inode_info
*i_pipe
;
782 struct block_device
*i_bdev
;
788 #ifdef CONFIG_FSNOTIFY
789 __u32 i_fsnotify_mask
; /* all events this inode cares about */
790 struct hlist_head i_fsnotify_marks
;
794 atomic_t i_readcount
; /* struct files open RO */
796 atomic_t i_writecount
;
797 #ifdef CONFIG_SECURITY
800 #ifdef CONFIG_FS_POSIX_ACL
801 struct posix_acl
*i_acl
;
802 struct posix_acl
*i_default_acl
;
804 void *i_private
; /* fs or device private pointer */
807 static inline int inode_unhashed(struct inode
*inode
)
809 return hlist_unhashed(&inode
->i_hash
);
813 * inode->i_mutex nesting subclasses for the lock validator:
815 * 0: the object of the current VFS operation
820 * The locking order between these classes is
821 * parent -> child -> normal -> xattr -> quota
823 enum inode_i_mutex_lock_class
833 * NOTE: in a 32bit arch with a preemptable kernel and
834 * an UP compile the i_size_read/write must be atomic
835 * with respect to the local cpu (unlike with preempt disabled),
836 * but they don't need to be atomic with respect to other cpus like in
837 * true SMP (so they need either to either locally disable irq around
838 * the read or for example on x86 they can be still implemented as a
839 * cmpxchg8b without the need of the lock prefix). For SMP compiles
840 * and 64bit archs it makes no difference if preempt is enabled or not.
842 static inline loff_t
i_size_read(const struct inode
*inode
)
844 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
849 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
850 i_size
= inode
->i_size
;
851 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
853 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
857 i_size
= inode
->i_size
;
861 return inode
->i_size
;
866 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
867 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
868 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
870 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
872 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
873 write_seqcount_begin(&inode
->i_size_seqcount
);
874 inode
->i_size
= i_size
;
875 write_seqcount_end(&inode
->i_size_seqcount
);
876 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
878 inode
->i_size
= i_size
;
881 inode
->i_size
= i_size
;
885 static inline unsigned iminor(const struct inode
*inode
)
887 return MINOR(inode
->i_rdev
);
890 static inline unsigned imajor(const struct inode
*inode
)
892 return MAJOR(inode
->i_rdev
);
895 extern struct block_device
*I_BDEV(struct inode
*inode
);
898 rwlock_t lock
; /* protects pid, uid, euid fields */
899 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
900 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
901 uid_t uid
, euid
; /* uid/euid of process setting the owner */
902 int signum
; /* posix.1b rt signal to be delivered on IO */
906 * Track a single file's readahead state
908 struct file_ra_state
{
909 pgoff_t start
; /* where readahead started */
910 unsigned int size
; /* # of readahead pages */
911 unsigned int async_size
; /* do asynchronous readahead when
912 there are only # of pages ahead */
914 unsigned int ra_pages
; /* Maximum readahead window */
915 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
916 loff_t prev_pos
; /* Cache last read() position */
920 * Check if @index falls in the readahead windows.
922 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
924 return (index
>= ra
->start
&&
925 index
< ra
->start
+ ra
->size
);
928 #define FILE_MNT_WRITE_TAKEN 1
929 #define FILE_MNT_WRITE_RELEASED 2
933 * fu_list becomes invalid after file_free is called and queued via
934 * fu_rcuhead for RCU freeing
937 struct list_head fu_list
;
938 struct rcu_head fu_rcuhead
;
941 #define f_dentry f_path.dentry
942 #define f_vfsmnt f_path.mnt
943 const struct file_operations
*f_op
;
944 spinlock_t f_lock
; /* f_ep_links, f_flags, no IRQ */
948 atomic_long_t f_count
;
949 unsigned int f_flags
;
952 struct fown_struct f_owner
;
953 const struct cred
*f_cred
;
954 struct file_ra_state f_ra
;
957 #ifdef CONFIG_SECURITY
960 /* needed for tty driver, and maybe others */
964 /* Used by fs/eventpoll.c to link all the hooks to this file */
965 struct list_head f_ep_links
;
966 #endif /* #ifdef CONFIG_EPOLL */
967 struct address_space
*f_mapping
;
968 #ifdef CONFIG_DEBUG_WRITECOUNT
969 unsigned long f_mnt_write_state
;
976 /* file identifier */
977 unsigned char f_handle
[0];
980 #define get_file(x) atomic_long_inc(&(x)->f_count)
981 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
982 #define file_count(x) atomic_long_read(&(x)->f_count)
984 #ifdef CONFIG_DEBUG_WRITECOUNT
985 static inline void file_take_write(struct file
*f
)
987 WARN_ON(f
->f_mnt_write_state
!= 0);
988 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
990 static inline void file_release_write(struct file
*f
)
992 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
994 static inline void file_reset_write(struct file
*f
)
996 f
->f_mnt_write_state
= 0;
998 static inline void file_check_state(struct file
*f
)
1001 * At this point, either both or neither of these bits
1004 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1005 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1007 static inline int file_check_writeable(struct file
*f
)
1009 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1011 printk(KERN_WARNING
"writeable file with no "
1012 "mnt_want_write()\n");
1016 #else /* !CONFIG_DEBUG_WRITECOUNT */
1017 static inline void file_take_write(struct file
*filp
) {}
1018 static inline void file_release_write(struct file
*filp
) {}
1019 static inline void file_reset_write(struct file
*filp
) {}
1020 static inline void file_check_state(struct file
*filp
) {}
1021 static inline int file_check_writeable(struct file
*filp
)
1025 #endif /* CONFIG_DEBUG_WRITECOUNT */
1027 #define MAX_NON_LFS ((1UL<<31) - 1)
1029 /* Page cache limit. The filesystems should put that into their s_maxbytes
1030 limits, otherwise bad things can happen in VM. */
1031 #if BITS_PER_LONG==32
1032 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1033 #elif BITS_PER_LONG==64
1034 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1039 #define FL_ACCESS 8 /* not trying to lock, just looking */
1040 #define FL_EXISTS 16 /* when unlocking, test for existence */
1041 #define FL_LEASE 32 /* lease held on this file */
1042 #define FL_CLOSE 64 /* unlock on close */
1043 #define FL_SLEEP 128 /* A blocking lock */
1046 * Special return value from posix_lock_file() and vfs_lock_file() for
1047 * asynchronous locking.
1049 #define FILE_LOCK_DEFERRED 1
1052 * The POSIX file lock owner is determined by
1053 * the "struct files_struct" in the thread group
1054 * (or NULL for no owner - BSD locks).
1056 * Lockd stuffs a "host" pointer into this.
1058 typedef struct files_struct
*fl_owner_t
;
1060 struct file_lock_operations
{
1061 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1062 void (*fl_release_private
)(struct file_lock
*);
1065 struct lock_manager_operations
{
1066 int (*fl_compare_owner
)(struct file_lock
*, struct file_lock
*);
1067 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
1068 int (*fl_grant
)(struct file_lock
*, struct file_lock
*, int);
1069 void (*fl_release_private
)(struct file_lock
*);
1070 void (*fl_break
)(struct file_lock
*);
1071 int (*fl_change
)(struct file_lock
**, int);
1074 struct lock_manager
{
1075 struct list_head list
;
1078 void locks_start_grace(struct lock_manager
*);
1079 void locks_end_grace(struct lock_manager
*);
1080 int locks_in_grace(void);
1082 /* that will die - we need it for nfs_lock_info */
1083 #include <linux/nfs_fs_i.h>
1086 struct file_lock
*fl_next
; /* singly linked list for this inode */
1087 struct list_head fl_link
; /* doubly linked list of all locks */
1088 struct list_head fl_block
; /* circular list of blocked processes */
1089 fl_owner_t fl_owner
;
1090 unsigned char fl_flags
;
1091 unsigned char fl_type
;
1092 unsigned int fl_pid
;
1093 struct pid
*fl_nspid
;
1094 wait_queue_head_t fl_wait
;
1095 struct file
*fl_file
;
1099 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1100 unsigned long fl_break_time
; /* for nonblocking lease breaks */
1102 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1103 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1105 struct nfs_lock_info nfs_fl
;
1106 struct nfs4_lock_info nfs4_fl
;
1108 struct list_head link
; /* link in AFS vnode's pending_locks list */
1109 int state
; /* state of grant or error if -ve */
1114 /* The following constant reflects the upper bound of the file/locking space */
1116 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1117 #define OFFSET_MAX INT_LIMIT(loff_t)
1118 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1121 #include <linux/fcntl.h>
1123 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1125 #ifdef CONFIG_FILE_LOCKING
1126 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1127 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1128 struct flock __user
*);
1130 #if BITS_PER_LONG == 32
1131 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1132 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1133 struct flock64 __user
*);
1136 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1137 extern int fcntl_getlease(struct file
*filp
);
1140 void locks_free_lock(struct file_lock
*fl
);
1141 extern void locks_init_lock(struct file_lock
*);
1142 extern struct file_lock
* locks_alloc_lock(void);
1143 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1144 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1145 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1146 extern void locks_remove_flock(struct file
*);
1147 extern void locks_release_private(struct file_lock
*);
1148 extern void posix_test_lock(struct file
*, struct file_lock
*);
1149 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1150 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1151 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1152 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1153 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1154 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1155 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1156 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1157 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1158 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1159 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1160 extern int lease_modify(struct file_lock
**, int);
1161 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1162 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1163 extern void lock_flocks(void);
1164 extern void unlock_flocks(void);
1165 #else /* !CONFIG_FILE_LOCKING */
1166 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1171 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1172 unsigned int cmd
, struct flock __user
*user
)
1177 #if BITS_PER_LONG == 32
1178 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1183 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1184 unsigned int cmd
, struct flock64 __user
*user
)
1189 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1194 static inline int fcntl_getlease(struct file
*filp
)
1199 static inline void locks_init_lock(struct file_lock
*fl
)
1204 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1209 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1214 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1219 static inline void locks_remove_flock(struct file
*filp
)
1224 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1229 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1230 struct file_lock
*conflock
)
1235 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1240 static inline int posix_unblock_lock(struct file
*filp
,
1241 struct file_lock
*waiter
)
1246 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1251 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1252 struct file_lock
*fl
, struct file_lock
*conf
)
1257 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1262 static inline int flock_lock_file_wait(struct file
*filp
,
1263 struct file_lock
*request
)
1268 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1273 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1278 static inline int generic_setlease(struct file
*filp
, long arg
,
1279 struct file_lock
**flp
)
1284 static inline int vfs_setlease(struct file
*filp
, long arg
,
1285 struct file_lock
**lease
)
1290 static inline int lease_modify(struct file_lock
**before
, int arg
)
1295 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1301 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1307 static inline void lock_flocks(void)
1311 static inline void unlock_flocks(void)
1315 #endif /* !CONFIG_FILE_LOCKING */
1318 struct fasync_struct
{
1322 struct fasync_struct
*fa_next
; /* singly linked list */
1323 struct file
*fa_file
;
1324 struct rcu_head fa_rcu
;
1327 #define FASYNC_MAGIC 0x4601
1329 /* SMP safe fasync helpers: */
1330 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1331 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1332 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1333 extern struct fasync_struct
*fasync_alloc(void);
1334 extern void fasync_free(struct fasync_struct
*);
1336 /* can be called from interrupts */
1337 extern void kill_fasync(struct fasync_struct
**, int, int);
1339 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1340 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1341 extern void f_delown(struct file
*filp
);
1342 extern pid_t
f_getown(struct file
*filp
);
1343 extern int send_sigurg(struct fown_struct
*fown
);
1349 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1350 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1351 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1352 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1353 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1355 extern struct list_head super_blocks
;
1356 extern spinlock_t sb_lock
;
1358 struct super_block
{
1359 struct list_head s_list
; /* Keep this first */
1360 dev_t s_dev
; /* search index; _not_ kdev_t */
1361 unsigned char s_dirt
;
1362 unsigned char s_blocksize_bits
;
1363 unsigned long s_blocksize
;
1364 loff_t s_maxbytes
; /* Max file size */
1365 struct file_system_type
*s_type
;
1366 const struct super_operations
*s_op
;
1367 const struct dquot_operations
*dq_op
;
1368 const struct quotactl_ops
*s_qcop
;
1369 const struct export_operations
*s_export_op
;
1370 unsigned long s_flags
;
1371 unsigned long s_magic
;
1372 struct dentry
*s_root
;
1373 struct rw_semaphore s_umount
;
1374 struct mutex s_lock
;
1377 #ifdef CONFIG_SECURITY
1380 const struct xattr_handler
**s_xattr
;
1382 struct list_head s_inodes
; /* all inodes */
1383 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1385 struct list_head __percpu
*s_files
;
1387 struct list_head s_files
;
1389 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1390 struct list_head s_dentry_lru
; /* unused dentry lru */
1391 int s_nr_dentry_unused
; /* # of dentry on lru */
1393 struct block_device
*s_bdev
;
1394 struct backing_dev_info
*s_bdi
;
1395 struct mtd_info
*s_mtd
;
1396 struct list_head s_instances
;
1397 struct quota_info s_dquot
; /* Diskquota specific options */
1400 wait_queue_head_t s_wait_unfrozen
;
1402 char s_id
[32]; /* Informational name */
1403 u8 s_uuid
[16]; /* UUID */
1405 void *s_fs_info
; /* Filesystem private info */
1408 /* Granularity of c/m/atime in ns.
1409 Cannot be worse than a second */
1413 * The next field is for VFS *only*. No filesystems have any business
1414 * even looking at it. You had been warned.
1416 struct mutex s_vfs_rename_mutex
; /* Kludge */
1419 * Filesystem subtype. If non-empty the filesystem type field
1420 * in /proc/mounts will be "type.subtype"
1425 * Saved mount options for lazy filesystems using
1426 * generic_show_options()
1428 char __rcu
*s_options
;
1429 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1432 extern struct timespec
current_fs_time(struct super_block
*sb
);
1435 * Snapshotting support.
1439 SB_FREEZE_WRITE
= 1,
1440 SB_FREEZE_TRANS
= 2,
1443 #define vfs_check_frozen(sb, level) \
1444 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1446 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1447 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1448 #define has_fs_excl() atomic_read(¤t->fs_excl)
1451 * until VFS tracks user namespaces for inodes, just make all files
1452 * belong to init_user_ns
1454 extern struct user_namespace init_user_ns
;
1455 #define inode_userns(inode) (&init_user_ns)
1456 extern bool inode_owner_or_capable(const struct inode
*inode
);
1458 /* not quite ready to be deprecated, but... */
1459 extern void lock_super(struct super_block
*);
1460 extern void unlock_super(struct super_block
*);
1463 * VFS helper functions..
1465 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
1466 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
1467 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
1468 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1469 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1470 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1471 extern int vfs_unlink(struct inode
*, struct dentry
*);
1472 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1475 * VFS dentry helper functions.
1477 extern void dentry_unhash(struct dentry
*dentry
);
1480 * VFS file helper functions.
1482 extern int file_permission(struct file
*, int);
1483 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1486 * VFS FS_IOC_FIEMAP helper definitions.
1488 struct fiemap_extent_info
{
1489 unsigned int fi_flags
; /* Flags as passed from user */
1490 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1491 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1492 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1493 fiemap_extent array */
1495 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1496 u64 phys
, u64 len
, u32 flags
);
1497 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1502 * NOTE! These match bits 12..15 of stat.st_mode
1503 * (ie "(i_mode >> 12) & 15").
1505 #define DT_UNKNOWN 0
1516 * This is the "filldir" function type, used by readdir() to let
1517 * the kernel specify what kind of dirent layout it wants to have.
1518 * This allows the kernel to read directories into kernel space or
1519 * to have different dirent layouts depending on the binary type.
1521 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1522 struct block_device_operations
;
1524 /* These macros are for out of kernel modules to test that
1525 * the kernel supports the unlocked_ioctl and compat_ioctl
1526 * fields in struct file_operations. */
1527 #define HAVE_COMPAT_IOCTL 1
1528 #define HAVE_UNLOCKED_IOCTL 1
1532 * all file operations except setlease can be called without
1533 * the big kernel lock held in all filesystems.
1535 struct file_operations
{
1536 struct module
*owner
;
1537 loff_t (*llseek
) (struct file
*, loff_t
, int);
1538 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1539 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1540 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1541 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1542 int (*readdir
) (struct file
*, void *, filldir_t
);
1543 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1544 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1545 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1546 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1547 int (*open
) (struct inode
*, struct file
*);
1548 int (*flush
) (struct file
*, fl_owner_t id
);
1549 int (*release
) (struct inode
*, struct file
*);
1550 int (*fsync
) (struct file
*, int datasync
);
1551 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1552 int (*fasync
) (int, struct file
*, int);
1553 int (*lock
) (struct file
*, int, struct file_lock
*);
1554 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1555 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1556 int (*check_flags
)(int);
1557 int (*flock
) (struct file
*, int, struct file_lock
*);
1558 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1559 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1560 int (*setlease
)(struct file
*, long, struct file_lock
**);
1561 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1565 #define IPERM_FLAG_RCU 0x0001
1567 struct inode_operations
{
1568 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1569 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1570 int (*permission
) (struct inode
*, int, unsigned int);
1571 int (*check_acl
)(struct inode
*, int, unsigned int);
1573 int (*readlink
) (struct dentry
*, char __user
*,int);
1574 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1576 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1577 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1578 int (*unlink
) (struct inode
*,struct dentry
*);
1579 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1580 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1581 int (*rmdir
) (struct inode
*,struct dentry
*);
1582 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1583 int (*rename
) (struct inode
*, struct dentry
*,
1584 struct inode
*, struct dentry
*);
1585 void (*truncate
) (struct inode
*);
1586 int (*setattr
) (struct dentry
*, struct iattr
*);
1587 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1588 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1589 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1590 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1591 int (*removexattr
) (struct dentry
*, const char *);
1592 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1593 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1595 } ____cacheline_aligned
;
1599 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1600 unsigned long nr_segs
, unsigned long fast_segs
,
1601 struct iovec
*fast_pointer
,
1602 struct iovec
**ret_pointer
);
1604 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1605 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1606 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1607 unsigned long, loff_t
*);
1608 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1609 unsigned long, loff_t
*);
1611 struct super_operations
{
1612 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1613 void (*destroy_inode
)(struct inode
*);
1615 void (*dirty_inode
) (struct inode
*);
1616 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1617 int (*drop_inode
) (struct inode
*);
1618 void (*evict_inode
) (struct inode
*);
1619 void (*put_super
) (struct super_block
*);
1620 void (*write_super
) (struct super_block
*);
1621 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1622 int (*freeze_fs
) (struct super_block
*);
1623 int (*unfreeze_fs
) (struct super_block
*);
1624 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1625 int (*remount_fs
) (struct super_block
*, int *, char *);
1626 void (*umount_begin
) (struct super_block
*);
1628 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1629 int (*show_devname
)(struct seq_file
*, struct vfsmount
*);
1630 int (*show_path
)(struct seq_file
*, struct vfsmount
*);
1631 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1633 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1634 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1636 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1640 * Inode state bits. Protected by inode->i_lock
1642 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1643 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1645 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1646 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1647 * various stages of removing an inode.
1649 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1651 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1652 * fdatasync(). i_atime is the usual cause.
1653 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1654 * these changes separately from I_DIRTY_SYNC so that we
1655 * don't have to write inode on fdatasync() when only
1656 * mtime has changed in it.
1657 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1658 * I_NEW Serves as both a mutex and completion notification.
1659 * New inodes set I_NEW. If two processes both create
1660 * the same inode, one of them will release its inode and
1661 * wait for I_NEW to be released before returning.
1662 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1663 * also cause waiting on I_NEW, without I_NEW actually
1664 * being set. find_inode() uses this to prevent returning
1665 * nearly-dead inodes.
1666 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1667 * is zero. I_FREEING must be set when I_WILL_FREE is
1669 * I_FREEING Set when inode is about to be freed but still has dirty
1670 * pages or buffers attached or the inode itself is still
1672 * I_CLEAR Added by end_writeback(). In this state the inode is clean
1673 * and can be destroyed. Inode keeps I_FREEING.
1675 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1676 * prohibited for many purposes. iget() must wait for
1677 * the inode to be completely released, then create it
1678 * anew. Other functions will just ignore such inodes,
1679 * if appropriate. I_NEW is used for waiting.
1681 * I_SYNC Synchonized write of dirty inode data. The bits is
1682 * set during data writeback, and cleared with a wakeup
1683 * on the bit address once it is done.
1685 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1687 #define I_DIRTY_SYNC (1 << 0)
1688 #define I_DIRTY_DATASYNC (1 << 1)
1689 #define I_DIRTY_PAGES (1 << 2)
1691 #define I_NEW (1 << __I_NEW)
1692 #define I_WILL_FREE (1 << 4)
1693 #define I_FREEING (1 << 5)
1694 #define I_CLEAR (1 << 6)
1696 #define I_SYNC (1 << __I_SYNC)
1697 #define I_REFERENCED (1 << 8)
1699 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1701 extern void __mark_inode_dirty(struct inode
*, int);
1702 static inline void mark_inode_dirty(struct inode
*inode
)
1704 __mark_inode_dirty(inode
, I_DIRTY
);
1707 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1709 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1713 * inc_nlink - directly increment an inode's link count
1716 * This is a low-level filesystem helper to replace any
1717 * direct filesystem manipulation of i_nlink. Currently,
1718 * it is only here for parity with dec_nlink().
1720 static inline void inc_nlink(struct inode
*inode
)
1725 static inline void inode_inc_link_count(struct inode
*inode
)
1728 mark_inode_dirty(inode
);
1732 * drop_nlink - directly drop an inode's link count
1735 * This is a low-level filesystem helper to replace any
1736 * direct filesystem manipulation of i_nlink. In cases
1737 * where we are attempting to track writes to the
1738 * filesystem, a decrement to zero means an imminent
1739 * write when the file is truncated and actually unlinked
1740 * on the filesystem.
1742 static inline void drop_nlink(struct inode
*inode
)
1748 * clear_nlink - directly zero an inode's link count
1751 * This is a low-level filesystem helper to replace any
1752 * direct filesystem manipulation of i_nlink. See
1753 * drop_nlink() for why we care about i_nlink hitting zero.
1755 static inline void clear_nlink(struct inode
*inode
)
1760 static inline void inode_dec_link_count(struct inode
*inode
)
1763 mark_inode_dirty(inode
);
1767 * inode_inc_iversion - increments i_version
1768 * @inode: inode that need to be updated
1770 * Every time the inode is modified, the i_version field will be incremented.
1771 * The filesystem has to be mounted with i_version flag
1774 static inline void inode_inc_iversion(struct inode
*inode
)
1776 spin_lock(&inode
->i_lock
);
1778 spin_unlock(&inode
->i_lock
);
1781 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1782 static inline void file_accessed(struct file
*file
)
1784 if (!(file
->f_flags
& O_NOATIME
))
1785 touch_atime(file
->f_path
.mnt
, file
->f_path
.dentry
);
1788 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1789 int sync_inode_metadata(struct inode
*inode
, int wait
);
1791 struct file_system_type
{
1794 struct dentry
*(*mount
) (struct file_system_type
*, int,
1795 const char *, void *);
1796 void (*kill_sb
) (struct super_block
*);
1797 struct module
*owner
;
1798 struct file_system_type
* next
;
1799 struct list_head fs_supers
;
1801 struct lock_class_key s_lock_key
;
1802 struct lock_class_key s_umount_key
;
1803 struct lock_class_key s_vfs_rename_key
;
1805 struct lock_class_key i_lock_key
;
1806 struct lock_class_key i_mutex_key
;
1807 struct lock_class_key i_mutex_dir_key
;
1808 struct lock_class_key i_alloc_sem_key
;
1811 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1812 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1813 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1814 int flags
, const char *dev_name
, void *data
,
1815 int (*fill_super
)(struct super_block
*, void *, int));
1816 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1817 int flags
, void *data
,
1818 int (*fill_super
)(struct super_block
*, void *, int));
1819 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1820 int flags
, void *data
,
1821 int (*fill_super
)(struct super_block
*, void *, int));
1822 void generic_shutdown_super(struct super_block
*sb
);
1823 void kill_block_super(struct super_block
*sb
);
1824 void kill_anon_super(struct super_block
*sb
);
1825 void kill_litter_super(struct super_block
*sb
);
1826 void deactivate_super(struct super_block
*sb
);
1827 void deactivate_locked_super(struct super_block
*sb
);
1828 int set_anon_super(struct super_block
*s
, void *data
);
1829 struct super_block
*sget(struct file_system_type
*type
,
1830 int (*test
)(struct super_block
*,void *),
1831 int (*set
)(struct super_block
*,void *),
1833 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1834 const struct super_operations
*ops
,
1835 const struct dentry_operations
*dops
,
1838 static inline void sb_mark_dirty(struct super_block
*sb
)
1842 static inline void sb_mark_clean(struct super_block
*sb
)
1846 static inline int sb_is_dirty(struct super_block
*sb
)
1851 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1852 #define fops_get(fops) \
1853 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1854 #define fops_put(fops) \
1855 do { if (fops) module_put((fops)->owner); } while(0)
1857 extern int register_filesystem(struct file_system_type
*);
1858 extern int unregister_filesystem(struct file_system_type
*);
1859 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1860 #define kern_mount(type) kern_mount_data(type, NULL)
1861 extern int may_umount_tree(struct vfsmount
*);
1862 extern int may_umount(struct vfsmount
*);
1863 extern long do_mount(char *, char *, char *, unsigned long, void *);
1864 extern struct vfsmount
*collect_mounts(struct path
*);
1865 extern void drop_collected_mounts(struct vfsmount
*);
1866 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1868 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1869 extern int user_statfs(const char __user
*, struct kstatfs
*);
1870 extern int fd_statfs(int, 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
*file_open_root(struct dentry
*, struct vfsmount
*,
1989 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
1990 const struct cred
*);
1991 extern int filp_close(struct file
*, fl_owner_t id
);
1992 extern char * getname(const char __user
*);
1996 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
1999 extern void __init
vfs_caches_init_early(void);
2000 extern void __init
vfs_caches_init(unsigned long);
2002 extern struct kmem_cache
*names_cachep
;
2004 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2005 #define __getname() __getname_gfp(GFP_KERNEL)
2006 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2007 #ifndef CONFIG_AUDITSYSCALL
2008 #define putname(name) __putname(name)
2010 extern void putname(const char *name
);
2014 extern int register_blkdev(unsigned int, const char *);
2015 extern void unregister_blkdev(unsigned int, const char *);
2016 extern struct block_device
*bdget(dev_t
);
2017 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2018 extern void bd_set_size(struct block_device
*, loff_t size
);
2019 extern void bd_forget(struct inode
*inode
);
2020 extern void bdput(struct block_device
*);
2021 extern void invalidate_bdev(struct block_device
*);
2022 extern int sync_blockdev(struct block_device
*bdev
);
2023 extern struct super_block
*freeze_bdev(struct block_device
*);
2024 extern void emergency_thaw_all(void);
2025 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2026 extern int fsync_bdev(struct block_device
*);
2028 static inline void bd_forget(struct inode
*inode
) {}
2029 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2030 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2032 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2037 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2042 extern int sync_filesystem(struct super_block
*);
2043 extern const struct file_operations def_blk_fops
;
2044 extern const struct file_operations def_chr_fops
;
2045 extern const struct file_operations bad_sock_fops
;
2046 extern const struct file_operations def_fifo_fops
;
2048 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2049 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2050 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2051 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2052 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2054 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2056 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2058 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2059 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2060 struct gendisk
*disk
);
2062 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2063 struct gendisk
*disk
)
2067 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2068 struct gendisk
*disk
)
2075 #define CHRDEV_MAJOR_HASH_SIZE 255
2076 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2077 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2078 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2079 unsigned int count
, const char *name
,
2080 const struct file_operations
*fops
);
2081 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2082 unsigned int count
, const char *name
);
2083 extern void unregister_chrdev_region(dev_t
, unsigned);
2084 extern void chrdev_show(struct seq_file
*,off_t
);
2086 static inline int register_chrdev(unsigned int major
, const char *name
,
2087 const struct file_operations
*fops
)
2089 return __register_chrdev(major
, 0, 256, name
, fops
);
2092 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2094 __unregister_chrdev(major
, 0, 256, name
);
2097 /* fs/block_dev.c */
2098 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2099 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2102 #define BLKDEV_MAJOR_HASH_SIZE 255
2103 extern const char *__bdevname(dev_t
, char *buffer
);
2104 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2105 extern struct block_device
*lookup_bdev(const char *);
2106 extern void blkdev_show(struct seq_file
*,off_t
);
2109 #define BLKDEV_MAJOR_HASH_SIZE 0
2112 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2114 /* Invalid inode operations -- fs/bad_inode.c */
2115 extern void make_bad_inode(struct inode
*);
2116 extern int is_bad_inode(struct inode
*);
2118 extern const struct file_operations read_pipefifo_fops
;
2119 extern const struct file_operations write_pipefifo_fops
;
2120 extern const struct file_operations rdwr_pipefifo_fops
;
2122 extern int fs_may_remount_ro(struct super_block
*);
2126 * return READ, READA, or WRITE
2128 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2131 * return data direction, READ or WRITE
2133 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2135 extern void check_disk_size_change(struct gendisk
*disk
,
2136 struct block_device
*bdev
);
2137 extern int revalidate_disk(struct gendisk
*);
2138 extern int check_disk_change(struct block_device
*);
2139 extern int __invalidate_device(struct block_device
*, bool);
2140 extern int invalidate_partition(struct gendisk
*, int);
2142 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2143 pgoff_t start
, pgoff_t end
);
2145 static inline void invalidate_remote_inode(struct inode
*inode
)
2147 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2148 S_ISLNK(inode
->i_mode
))
2149 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2151 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2152 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2153 pgoff_t start
, pgoff_t end
);
2154 extern int write_inode_now(struct inode
*, int);
2155 extern int filemap_fdatawrite(struct address_space
*);
2156 extern int filemap_flush(struct address_space
*);
2157 extern int filemap_fdatawait(struct address_space
*);
2158 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2160 extern int filemap_write_and_wait(struct address_space
*mapping
);
2161 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2162 loff_t lstart
, loff_t lend
);
2163 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2164 loff_t start
, loff_t end
, int sync_mode
);
2165 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2166 loff_t start
, loff_t end
);
2168 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2170 extern int vfs_fsync(struct file
*file
, int datasync
);
2171 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2172 extern void sync_supers(void);
2173 extern void emergency_sync(void);
2174 extern void emergency_remount(void);
2176 extern sector_t
bmap(struct inode
*, sector_t
);
2178 extern int notify_change(struct dentry
*, struct iattr
*);
2179 extern int inode_permission(struct inode
*, int);
2180 extern int generic_permission(struct inode
*, int, unsigned int,
2181 int (*check_acl
)(struct inode
*, int, unsigned int));
2183 static inline bool execute_ok(struct inode
*inode
)
2185 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2188 extern int get_write_access(struct inode
*);
2189 extern int deny_write_access(struct file
*);
2190 static inline void put_write_access(struct inode
* inode
)
2192 atomic_dec(&inode
->i_writecount
);
2194 static inline void allow_write_access(struct file
*file
)
2197 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2200 static inline void i_readcount_dec(struct inode
*inode
)
2202 BUG_ON(!atomic_read(&inode
->i_readcount
));
2203 atomic_dec(&inode
->i_readcount
);
2205 static inline void i_readcount_inc(struct inode
*inode
)
2207 atomic_inc(&inode
->i_readcount
);
2210 static inline void i_readcount_dec(struct inode
*inode
)
2214 static inline void i_readcount_inc(struct inode
*inode
)
2219 extern int do_pipe_flags(int *, int);
2220 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2221 extern struct file
*create_write_pipe(int flags
);
2222 extern void free_write_pipe(struct file
*);
2224 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2225 extern struct file
* open_exec(const char *);
2227 /* fs/dcache.c -- generic fs support functions */
2228 extern int is_subdir(struct dentry
*, struct dentry
*);
2229 extern int path_is_under(struct path
*, struct path
*);
2230 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2232 #include <linux/err.h>
2234 /* needed for stackable file system support */
2235 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2237 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2239 extern int inode_init_always(struct super_block
*, struct inode
*);
2240 extern void inode_init_once(struct inode
*);
2241 extern void address_space_init_once(struct address_space
*mapping
);
2242 extern void ihold(struct inode
* inode
);
2243 extern void iput(struct inode
*);
2244 extern struct inode
* igrab(struct inode
*);
2245 extern ino_t
iunique(struct super_block
*, ino_t
);
2246 extern int inode_needs_sync(struct inode
*inode
);
2247 extern int generic_delete_inode(struct inode
*inode
);
2248 extern int generic_drop_inode(struct inode
*inode
);
2250 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2251 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2253 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2254 int (*test
)(struct inode
*, void *), void *data
);
2255 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2257 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2258 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2259 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2260 extern int insert_inode_locked(struct inode
*);
2261 extern void unlock_new_inode(struct inode
*);
2262 extern unsigned int get_next_ino(void);
2264 extern void __iget(struct inode
* inode
);
2265 extern void iget_failed(struct inode
*);
2266 extern void end_writeback(struct inode
*);
2267 extern void __destroy_inode(struct inode
*);
2268 extern struct inode
*new_inode(struct super_block
*);
2269 extern void free_inode_nonrcu(struct inode
*inode
);
2270 extern int should_remove_suid(struct dentry
*);
2271 extern int file_remove_suid(struct file
*);
2273 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2274 extern void remove_inode_hash(struct inode
*);
2275 static inline void insert_inode_hash(struct inode
*inode
)
2277 __insert_inode_hash(inode
, inode
->i_ino
);
2279 extern void inode_sb_list_add(struct inode
*inode
);
2282 extern void submit_bio(int, struct bio
*);
2283 extern int bdev_read_only(struct block_device
*);
2285 extern int set_blocksize(struct block_device
*, int);
2286 extern int sb_set_blocksize(struct super_block
*, int);
2287 extern int sb_min_blocksize(struct super_block
*, int);
2289 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2290 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2291 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2292 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2293 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2294 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2296 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2297 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2298 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2299 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2300 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2301 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2302 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2303 extern int generic_segment_checks(const struct iovec
*iov
,
2304 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2306 /* fs/block_dev.c */
2307 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2308 unsigned long nr_segs
, loff_t pos
);
2309 extern int blkdev_fsync(struct file
*filp
, int datasync
);
2312 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2313 struct pipe_inode_info
*, size_t, unsigned int);
2314 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2315 struct pipe_inode_info
*, size_t, unsigned int);
2316 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2317 struct file
*, loff_t
*, size_t, unsigned int);
2318 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2319 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2320 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2321 size_t len
, unsigned int flags
);
2324 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2325 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2326 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2327 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2328 extern loff_t
generic_file_llseek_unlocked(struct file
*file
, loff_t offset
,
2330 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2331 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2333 #ifdef CONFIG_FS_XIP
2334 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2336 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2337 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2338 size_t len
, loff_t
*ppos
);
2339 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2341 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2348 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2349 loff_t file_offset
);
2352 /* need locking between buffered and direct access */
2355 /* filesystem does not support filling holes */
2356 DIO_SKIP_HOLES
= 0x02,
2359 void dio_end_io(struct bio
*bio
, int error
);
2361 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2362 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2363 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2364 dio_submit_t submit_io
, int flags
);
2366 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2367 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
2368 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
2369 dio_iodone_t end_io
)
2371 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
2372 nr_segs
, get_block
, end_io
, NULL
,
2373 DIO_LOCKING
| DIO_SKIP_HOLES
);
2377 extern const struct file_operations generic_ro_fops
;
2379 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2381 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2382 extern int vfs_follow_link(struct nameidata
*, const char *);
2383 extern int page_readlink(struct dentry
*, char __user
*, int);
2384 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2385 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2386 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2388 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2389 extern const struct inode_operations page_symlink_inode_operations
;
2390 extern int generic_readlink(struct dentry
*, char __user
*, int);
2391 extern void generic_fillattr(struct inode
*, struct kstat
*);
2392 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2393 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2394 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2395 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2396 loff_t
inode_get_bytes(struct inode
*inode
);
2397 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2399 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2401 extern int vfs_stat(const char __user
*, struct kstat
*);
2402 extern int vfs_lstat(const char __user
*, struct kstat
*);
2403 extern int vfs_fstat(unsigned int, struct kstat
*);
2404 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2406 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2408 extern int __generic_block_fiemap(struct inode
*inode
,
2409 struct fiemap_extent_info
*fieinfo
,
2410 loff_t start
, loff_t len
,
2411 get_block_t
*get_block
);
2412 extern int generic_block_fiemap(struct inode
*inode
,
2413 struct fiemap_extent_info
*fieinfo
, u64 start
,
2414 u64 len
, get_block_t
*get_block
);
2416 extern void get_filesystem(struct file_system_type
*fs
);
2417 extern void put_filesystem(struct file_system_type
*fs
);
2418 extern struct file_system_type
*get_fs_type(const char *name
);
2419 extern struct super_block
*get_super(struct block_device
*);
2420 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2421 extern struct super_block
*user_get_super(dev_t
);
2422 extern void drop_super(struct super_block
*sb
);
2423 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2425 extern int dcache_dir_open(struct inode
*, struct file
*);
2426 extern int dcache_dir_close(struct inode
*, struct file
*);
2427 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2428 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2429 extern int simple_setattr(struct dentry
*, struct iattr
*);
2430 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2431 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2432 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2433 extern int simple_unlink(struct inode
*, struct dentry
*);
2434 extern int simple_rmdir(struct inode
*, struct dentry
*);
2435 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2436 extern int noop_fsync(struct file
*, int);
2437 extern int simple_empty(struct dentry
*);
2438 extern int simple_readpage(struct file
*file
, struct page
*page
);
2439 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2440 loff_t pos
, unsigned len
, unsigned flags
,
2441 struct page
**pagep
, void **fsdata
);
2442 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2443 loff_t pos
, unsigned len
, unsigned copied
,
2444 struct page
*page
, void *fsdata
);
2446 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2447 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2448 extern const struct file_operations simple_dir_operations
;
2449 extern const struct inode_operations simple_dir_inode_operations
;
2450 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2451 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2452 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2453 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2454 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2456 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2457 loff_t
*ppos
, const void *from
, size_t available
);
2458 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2459 const void __user
*from
, size_t count
);
2461 extern int generic_file_fsync(struct file
*, int);
2463 extern int generic_check_addressable(unsigned, u64
);
2465 #ifdef CONFIG_MIGRATION
2466 extern int buffer_migrate_page(struct address_space
*,
2467 struct page
*, struct page
*);
2469 #define buffer_migrate_page NULL
2472 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2473 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2474 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2476 extern void file_update_time(struct file
*file
);
2478 extern int generic_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
2479 extern void save_mount_options(struct super_block
*sb
, char *options
);
2480 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2482 static inline ino_t
parent_ino(struct dentry
*dentry
)
2487 * Don't strictly need d_lock here? If the parent ino could change
2488 * then surely we'd have a deeper race in the caller?
2490 spin_lock(&dentry
->d_lock
);
2491 res
= dentry
->d_parent
->d_inode
->i_ino
;
2492 spin_unlock(&dentry
->d_lock
);
2496 /* Transaction based IO helpers */
2499 * An argresp is stored in an allocated page and holds the
2500 * size of the argument or response, along with its content
2502 struct simple_transaction_argresp
{
2507 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2509 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2511 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2512 size_t size
, loff_t
*pos
);
2513 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2515 void simple_transaction_set(struct file
*file
, size_t n
);
2518 * simple attribute files
2520 * These attributes behave similar to those in sysfs:
2522 * Writing to an attribute immediately sets a value, an open file can be
2523 * written to multiple times.
2525 * Reading from an attribute creates a buffer from the value that might get
2526 * read with multiple read calls. When the attribute has been read
2527 * completely, no further read calls are possible until the file is opened
2530 * All attributes contain a text representation of a numeric value
2531 * that are accessed with the get() and set() functions.
2533 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2534 static int __fops ## _open(struct inode *inode, struct file *file) \
2536 __simple_attr_check_format(__fmt, 0ull); \
2537 return simple_attr_open(inode, file, __get, __set, __fmt); \
2539 static const struct file_operations __fops = { \
2540 .owner = THIS_MODULE, \
2541 .open = __fops ## _open, \
2542 .release = simple_attr_release, \
2543 .read = simple_attr_read, \
2544 .write = simple_attr_write, \
2545 .llseek = generic_file_llseek, \
2548 static inline void __attribute__((format(printf
, 1, 2)))
2549 __simple_attr_check_format(const char *fmt
, ...)
2551 /* don't do anything, just let the compiler check the arguments; */
2554 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2555 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2557 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2558 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2559 size_t len
, loff_t
*ppos
);
2560 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2561 size_t len
, loff_t
*ppos
);
2564 int proc_nr_files(struct ctl_table
*table
, int write
,
2565 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2566 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2567 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2568 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2569 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2570 int __init
get_filesystem_list(char *buf
);
2572 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2573 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2575 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2576 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2577 (flag & __FMODE_NONOTIFY)))
2579 #endif /* __KERNEL__ */
2580 #endif /* _LINUX_FS_H */