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_CUR 1024 /* Initial setting for nfile rlimits */
27 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
29 #define BLOCK_SIZE_BITS 10
30 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
32 #define SEEK_SET 0 /* seek relative to beginning of file */
33 #define SEEK_CUR 1 /* seek relative to current file position */
34 #define SEEK_END 2 /* seek relative to end of file */
35 #define SEEK_DATA 3 /* seek to the next data */
36 #define SEEK_HOLE 4 /* seek to the next hole */
37 #define SEEK_MAX SEEK_HOLE
45 /* And dynamically-tunable limits and defaults: */
46 struct files_stat_struct
{
47 unsigned long nr_files
; /* read only */
48 unsigned long nr_free_files
; /* read only */
49 unsigned long max_files
; /* tunable */
52 struct inodes_stat_t
{
55 int dummy
[5]; /* padding for sysctl ABI compatibility */
59 #define NR_FILE 8192 /* this can well be larger on a larger system */
61 #define MAY_EXEC 0x00000001
62 #define MAY_WRITE 0x00000002
63 #define MAY_READ 0x00000004
64 #define MAY_APPEND 0x00000008
65 #define MAY_ACCESS 0x00000010
66 #define MAY_OPEN 0x00000020
67 #define MAY_CHDIR 0x00000040
68 /* called from RCU mode, don't block */
69 #define MAY_NOT_BLOCK 0x00000080
72 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
73 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
76 /* file is open for reading */
77 #define FMODE_READ ((__force fmode_t)0x1)
78 /* file is open for writing */
79 #define FMODE_WRITE ((__force fmode_t)0x2)
80 /* file is seekable */
81 #define FMODE_LSEEK ((__force fmode_t)0x4)
82 /* file can be accessed using pread */
83 #define FMODE_PREAD ((__force fmode_t)0x8)
84 /* file can be accessed using pwrite */
85 #define FMODE_PWRITE ((__force fmode_t)0x10)
86 /* File is opened for execution with sys_execve / sys_uselib */
87 #define FMODE_EXEC ((__force fmode_t)0x20)
88 /* File is opened with O_NDELAY (only set for block devices) */
89 #define FMODE_NDELAY ((__force fmode_t)0x40)
90 /* File is opened with O_EXCL (only set for block devices) */
91 #define FMODE_EXCL ((__force fmode_t)0x80)
92 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
93 (specialy hack for floppy.c) */
94 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
95 /* 32bit hashes as llseek() offset (for directories) */
96 #define FMODE_32BITHASH ((__force fmode_t)0x200)
97 /* 64bit hashes as llseek() offset (for directories) */
98 #define FMODE_64BITHASH ((__force fmode_t)0x400)
101 * Don't update ctime and mtime.
103 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
104 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
106 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
108 /* Expect random access pattern */
109 #define FMODE_RANDOM ((__force fmode_t)0x1000)
111 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
112 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
114 /* File is opened with O_PATH; almost nothing can be done with it */
115 #define FMODE_PATH ((__force fmode_t)0x4000)
117 /* File was opened by fanotify and shouldn't generate fanotify events */
118 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
121 * The below are the various read and write types that we support. Some of
122 * them include behavioral modifiers that send information down to the
123 * block layer and IO scheduler. Terminology:
125 * The block layer uses device plugging to defer IO a little bit, in
126 * the hope that we will see more IO very shortly. This increases
127 * coalescing of adjacent IO and thus reduces the number of IOs we
128 * have to send to the device. It also allows for better queuing,
129 * if the IO isn't mergeable. If the caller is going to be waiting
130 * for the IO, then he must ensure that the device is unplugged so
131 * that the IO is dispatched to the driver.
133 * All IO is handled async in Linux. This is fine for background
134 * writes, but for reads or writes that someone waits for completion
135 * on, we want to notify the block layer and IO scheduler so that they
136 * know about it. That allows them to make better scheduling
137 * decisions. So when the below references 'sync' and 'async', it
138 * is referencing this priority hint.
140 * With that in mind, the available types are:
142 * READ A normal read operation. Device will be plugged.
143 * READ_SYNC A synchronous read. Device is not plugged, caller can
144 * immediately wait on this read without caring about
146 * READA Used for read-ahead operations. Lower priority, and the
147 * block layer could (in theory) choose to ignore this
148 * request if it runs into resource problems.
149 * WRITE A normal async write. Device will be plugged.
150 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
151 * the hint that someone will be waiting on this IO
152 * shortly. The write equivalent of READ_SYNC.
153 * WRITE_ODIRECT Special case write for O_DIRECT only.
154 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
155 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
156 * non-volatile media on completion.
157 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
158 * by a cache flush and data is guaranteed to be on
159 * non-volatile media on completion.
162 #define RW_MASK REQ_WRITE
163 #define RWA_MASK REQ_RAHEAD
166 #define WRITE RW_MASK
167 #define READA RWA_MASK
169 #define READ_SYNC (READ | REQ_SYNC)
170 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
171 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
172 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
173 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
174 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
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_NOSEC (1<<28)
218 #define MS_BORN (1<<29)
219 #define MS_ACTIVE (1<<30)
220 #define MS_NOUSER (1<<31)
223 * Superblock flags that can be altered by MS_REMOUNT
225 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
228 * Old magic mount flag and mask
230 #define MS_MGC_VAL 0xC0ED0000
231 #define MS_MGC_MSK 0xffff0000
233 /* Inode flags - they have nothing to superblock flags now */
235 #define S_SYNC 1 /* Writes are synced at once */
236 #define S_NOATIME 2 /* Do not update access times */
237 #define S_APPEND 4 /* Append-only file */
238 #define S_IMMUTABLE 8 /* Immutable file */
239 #define S_DEAD 16 /* removed, but still open directory */
240 #define S_NOQUOTA 32 /* Inode is not counted to quota */
241 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
242 #define S_NOCMTIME 128 /* Do not update file c/mtime */
243 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
244 #define S_PRIVATE 512 /* Inode is fs-internal */
245 #define S_IMA 1024 /* Inode has an associated IMA struct */
246 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
247 #define S_NOSEC 4096 /* no suid or xattr security attributes */
250 * Note that nosuid etc flags are inode-specific: setting some file-system
251 * flags just means all the inodes inherit those flags by default. It might be
252 * possible to override it selectively if you really wanted to with some
253 * ioctl() that is not currently implemented.
255 * Exception: MS_RDONLY is always applied to the entire file system.
257 * Unfortunately, it is possible to change a filesystems flags with it mounted
258 * with files in use. This means that all of the inodes will not have their
259 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
260 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
262 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
264 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
265 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
266 ((inode)->i_flags & S_SYNC))
267 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
268 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
269 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
270 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
271 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
273 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
274 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
275 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
276 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
278 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
279 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
280 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
281 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
282 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
283 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
284 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
286 /* the read-only stuff doesn't really belong here, but any other place is
287 probably as bad and I don't want to create yet another include file. */
289 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
290 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
291 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
292 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
293 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
294 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
295 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
296 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
297 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
298 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
299 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
300 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
302 #define BLKPG _IO(0x12,105)/* See blkpg.h */
304 /* Some people are morons. Do not use sizeof! */
306 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
307 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
308 /* This was here just to show that the number is taken -
309 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
311 /* A jump here: 108-111 have been used for various private purposes. */
312 #define BLKBSZGET _IOR(0x12,112,size_t)
313 #define BLKBSZSET _IOW(0x12,113,size_t)
314 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
315 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
316 #define BLKTRACESTART _IO(0x12,116)
317 #define BLKTRACESTOP _IO(0x12,117)
318 #define BLKTRACETEARDOWN _IO(0x12,118)
319 #define BLKDISCARD _IO(0x12,119)
320 #define BLKIOMIN _IO(0x12,120)
321 #define BLKIOOPT _IO(0x12,121)
322 #define BLKALIGNOFF _IO(0x12,122)
323 #define BLKPBSZGET _IO(0x12,123)
324 #define BLKDISCARDZEROES _IO(0x12,124)
325 #define BLKSECDISCARD _IO(0x12,125)
326 #define BLKROTATIONAL _IO(0x12,126)
328 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
329 #define FIBMAP _IO(0x00,1) /* bmap access */
330 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
331 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
332 #define FITHAW _IOWR('X', 120, int) /* Thaw */
333 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
335 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
336 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
337 #define FS_IOC_GETVERSION _IOR('v', 1, long)
338 #define FS_IOC_SETVERSION _IOW('v', 2, long)
339 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
340 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
341 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
342 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
343 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
346 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
348 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
349 #define FS_UNRM_FL 0x00000002 /* Undelete */
350 #define FS_COMPR_FL 0x00000004 /* Compress file */
351 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
352 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
353 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
354 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
355 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
356 /* Reserved for compression usage... */
357 #define FS_DIRTY_FL 0x00000100
358 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
359 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
360 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
361 /* End compression flags --- maybe not all used */
362 #define FS_BTREE_FL 0x00001000 /* btree format dir */
363 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
364 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
365 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
366 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
367 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
368 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
369 #define FS_EXTENT_FL 0x00080000 /* Extents */
370 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
371 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
372 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
374 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
375 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
378 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
379 #define SYNC_FILE_RANGE_WRITE 2
380 #define SYNC_FILE_RANGE_WAIT_AFTER 4
384 #include <linux/linkage.h>
385 #include <linux/wait.h>
386 #include <linux/kdev_t.h>
387 #include <linux/dcache.h>
388 #include <linux/path.h>
389 #include <linux/stat.h>
390 #include <linux/cache.h>
391 #include <linux/list.h>
392 #include <linux/radix-tree.h>
393 #include <linux/prio_tree.h>
394 #include <linux/init.h>
395 #include <linux/pid.h>
396 #include <linux/bug.h>
397 #include <linux/mutex.h>
398 #include <linux/capability.h>
399 #include <linux/semaphore.h>
400 #include <linux/fiemap.h>
401 #include <linux/rculist_bl.h>
402 #include <linux/atomic.h>
403 #include <linux/shrinker.h>
404 #include <linux/migrate_mode.h>
406 #include <asm/byteorder.h>
408 struct export_operations
;
414 struct pipe_inode_info
;
415 struct poll_table_struct
;
417 struct vm_area_struct
;
421 extern void __init
inode_init(void);
422 extern void __init
inode_init_early(void);
423 extern void __init
files_init(unsigned long);
425 extern struct files_stat_struct files_stat
;
426 extern unsigned long get_max_files(void);
427 extern int sysctl_nr_open
;
428 extern struct inodes_stat_t inodes_stat
;
429 extern int leases_enable
, lease_break_time
;
432 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
433 struct buffer_head
*bh_result
, int create
);
434 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
435 ssize_t bytes
, void *private, int ret
,
439 * Attribute flags. These should be or-ed together to figure out what
442 #define ATTR_MODE (1 << 0)
443 #define ATTR_UID (1 << 1)
444 #define ATTR_GID (1 << 2)
445 #define ATTR_SIZE (1 << 3)
446 #define ATTR_ATIME (1 << 4)
447 #define ATTR_MTIME (1 << 5)
448 #define ATTR_CTIME (1 << 6)
449 #define ATTR_ATIME_SET (1 << 7)
450 #define ATTR_MTIME_SET (1 << 8)
451 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
452 #define ATTR_ATTR_FLAG (1 << 10)
453 #define ATTR_KILL_SUID (1 << 11)
454 #define ATTR_KILL_SGID (1 << 12)
455 #define ATTR_FILE (1 << 13)
456 #define ATTR_KILL_PRIV (1 << 14)
457 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
458 #define ATTR_TIMES_SET (1 << 16)
461 * This is the Inode Attributes structure, used for notify_change(). It
462 * uses the above definitions as flags, to know which values have changed.
463 * Also, in this manner, a Filesystem can look at only the values it cares
464 * about. Basically, these are the attributes that the VFS layer can
465 * request to change from the FS layer.
467 * Derek Atkins <warlord@MIT.EDU> 94-10-20
470 unsigned int ia_valid
;
475 struct timespec ia_atime
;
476 struct timespec ia_mtime
;
477 struct timespec ia_ctime
;
480 * Not an attribute, but an auxiliary info for filesystems wanting to
481 * implement an ftruncate() like method. NOTE: filesystem should
482 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
484 struct file
*ia_file
;
488 * Includes for diskquotas.
490 #include <linux/quota.h>
493 * enum positive_aop_returns - aop return codes with specific semantics
495 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
496 * completed, that the page is still locked, and
497 * should be considered active. The VM uses this hint
498 * to return the page to the active list -- it won't
499 * be a candidate for writeback again in the near
500 * future. Other callers must be careful to unlock
501 * the page if they get this return. Returned by
504 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
505 * unlocked it and the page might have been truncated.
506 * The caller should back up to acquiring a new page and
507 * trying again. The aop will be taking reasonable
508 * precautions not to livelock. If the caller held a page
509 * reference, it should drop it before retrying. Returned
512 * address_space_operation functions return these large constants to indicate
513 * special semantics to the caller. These are much larger than the bytes in a
514 * page to allow for functions that return the number of bytes operated on in a
518 enum positive_aop_returns
{
519 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
520 AOP_TRUNCATED_PAGE
= 0x80001,
523 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
524 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
525 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
526 * helper code (eg buffer layer)
527 * to clear GFP_FS from alloc */
530 * oh the beauties of C type declarations.
533 struct address_space
;
534 struct writeback_control
;
537 const struct iovec
*iov
;
538 unsigned long nr_segs
;
543 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
544 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
545 size_t iov_iter_copy_from_user(struct page
*page
,
546 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
547 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
548 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
549 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
551 static inline void iov_iter_init(struct iov_iter
*i
,
552 const struct iovec
*iov
, unsigned long nr_segs
,
553 size_t count
, size_t written
)
556 i
->nr_segs
= nr_segs
;
558 i
->count
= count
+ written
;
560 iov_iter_advance(i
, written
);
563 static inline size_t iov_iter_count(struct iov_iter
*i
)
569 * "descriptor" for what we're up to with a read.
570 * This allows us to use the same read code yet
571 * have multiple different users of the data that
572 * we read from a file.
574 * The simplest case just copies the data to user
587 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
588 unsigned long, unsigned long);
590 struct address_space_operations
{
591 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
592 int (*readpage
)(struct file
*, struct page
*);
594 /* Write back some dirty pages from this mapping. */
595 int (*writepages
)(struct address_space
*, struct writeback_control
*);
597 /* Set a page dirty. Return true if this dirtied it */
598 int (*set_page_dirty
)(struct page
*page
);
600 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
601 struct list_head
*pages
, unsigned nr_pages
);
603 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
604 loff_t pos
, unsigned len
, unsigned flags
,
605 struct page
**pagep
, void **fsdata
);
606 int (*write_end
)(struct file
*, struct address_space
*mapping
,
607 loff_t pos
, unsigned len
, unsigned copied
,
608 struct page
*page
, void *fsdata
);
610 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
611 sector_t (*bmap
)(struct address_space
*, sector_t
);
612 void (*invalidatepage
) (struct page
*, unsigned long);
613 int (*releasepage
) (struct page
*, gfp_t
);
614 void (*freepage
)(struct page
*);
615 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
616 loff_t offset
, unsigned long nr_segs
);
617 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
618 void **, unsigned long *);
620 * migrate the contents of a page to the specified target. If sync
621 * is false, it must not block.
623 int (*migratepage
) (struct address_space
*,
624 struct page
*, struct page
*, enum migrate_mode
);
625 int (*launder_page
) (struct page
*);
626 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
628 int (*error_remove_page
)(struct address_space
*, struct page
*);
631 extern const struct address_space_operations empty_aops
;
634 * pagecache_write_begin/pagecache_write_end must be used by general code
635 * to write into the pagecache.
637 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
638 loff_t pos
, unsigned len
, unsigned flags
,
639 struct page
**pagep
, void **fsdata
);
641 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
642 loff_t pos
, unsigned len
, unsigned copied
,
643 struct page
*page
, void *fsdata
);
645 struct backing_dev_info
;
646 struct address_space
{
647 struct inode
*host
; /* owner: inode, block_device */
648 struct radix_tree_root page_tree
; /* radix tree of all pages */
649 spinlock_t tree_lock
; /* and lock protecting it */
650 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
651 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
652 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
653 struct mutex i_mmap_mutex
; /* protect tree, count, list */
654 /* Protected by tree_lock together with the radix tree */
655 unsigned long nrpages
; /* number of total pages */
656 pgoff_t writeback_index
;/* writeback starts here */
657 const struct address_space_operations
*a_ops
; /* methods */
658 unsigned long flags
; /* error bits/gfp mask */
659 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
660 spinlock_t private_lock
; /* for use by the address_space */
661 struct list_head private_list
; /* ditto */
662 struct address_space
*assoc_mapping
; /* ditto */
663 } __attribute__((aligned(sizeof(long))));
665 * On most architectures that alignment is already the case; but
666 * must be enforced here for CRIS, to let the least significant bit
667 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
669 struct request_queue
;
671 struct block_device
{
672 dev_t bd_dev
; /* not a kdev_t - it's a search key */
674 struct inode
* bd_inode
; /* will die */
675 struct super_block
* bd_super
;
676 struct mutex bd_mutex
; /* open/close mutex */
677 struct list_head bd_inodes
;
681 bool bd_write_holder
;
683 struct list_head bd_holder_disks
;
685 struct block_device
* bd_contains
;
686 unsigned bd_block_size
;
687 struct hd_struct
* bd_part
;
688 /* number of times partitions within this device have been opened. */
689 unsigned bd_part_count
;
691 struct gendisk
* bd_disk
;
692 struct request_queue
* bd_queue
;
693 struct list_head bd_list
;
695 * Private data. You must have bd_claim'ed the block_device
696 * to use this. NOTE: bd_claim allows an owner to claim
697 * the same device multiple times, the owner must take special
698 * care to not mess up bd_private for that case.
700 unsigned long bd_private
;
702 /* The counter of freeze processes */
703 int bd_fsfreeze_count
;
704 /* Mutex for freeze */
705 struct mutex bd_fsfreeze_mutex
;
709 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
712 #define PAGECACHE_TAG_DIRTY 0
713 #define PAGECACHE_TAG_WRITEBACK 1
714 #define PAGECACHE_TAG_TOWRITE 2
716 int mapping_tagged(struct address_space
*mapping
, int tag
);
719 * Might pages of this file be mapped into userspace?
721 static inline int mapping_mapped(struct address_space
*mapping
)
723 return !prio_tree_empty(&mapping
->i_mmap
) ||
724 !list_empty(&mapping
->i_mmap_nonlinear
);
728 * Might pages of this file have been modified in userspace?
729 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
730 * marks vma as VM_SHARED if it is shared, and the file was opened for
731 * writing i.e. vma may be mprotected writable even if now readonly.
733 static inline int mapping_writably_mapped(struct address_space
*mapping
)
735 return mapping
->i_mmap_writable
!= 0;
739 * Use sequence counter to get consistent i_size on 32-bit processors.
741 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
742 #include <linux/seqlock.h>
743 #define __NEED_I_SIZE_ORDERED
744 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
746 #define i_size_ordered_init(inode) do { } while (0)
750 #define ACL_NOT_CACHED ((void *)(-1))
752 #define IOP_FASTPERM 0x0001
753 #define IOP_LOOKUP 0x0002
754 #define IOP_NOFOLLOW 0x0004
757 * Keep mostly read-only and often accessed (especially for
758 * the RCU path lookup and 'stat' data) fields at the beginning
759 * of the 'struct inode'
763 unsigned short i_opflags
;
766 unsigned int i_flags
;
768 #ifdef CONFIG_FS_POSIX_ACL
769 struct posix_acl
*i_acl
;
770 struct posix_acl
*i_default_acl
;
773 const struct inode_operations
*i_op
;
774 struct super_block
*i_sb
;
775 struct address_space
*i_mapping
;
777 #ifdef CONFIG_SECURITY
781 /* Stat data, not accessed from path walking */
784 * Filesystems may only read i_nlink directly. They shall use the
785 * following functions for modification:
787 * (set|clear|inc|drop)_nlink
788 * inode_(inc|dec)_link_count
791 const unsigned int i_nlink
;
792 unsigned int __i_nlink
;
795 struct timespec i_atime
;
796 struct timespec i_mtime
;
797 struct timespec i_ctime
;
798 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
799 unsigned short i_bytes
;
803 #ifdef __NEED_I_SIZE_ORDERED
804 seqcount_t i_size_seqcount
;
808 unsigned long i_state
;
809 struct mutex i_mutex
;
811 unsigned long dirtied_when
; /* jiffies of first dirtying */
813 struct hlist_node i_hash
;
814 struct list_head i_wb_list
; /* backing dev IO list */
815 struct list_head i_lru
; /* inode LRU list */
816 struct list_head i_sb_list
;
818 struct list_head i_dentry
;
819 struct rcu_head i_rcu
;
822 unsigned int i_blkbits
;
824 atomic_t i_dio_count
;
825 atomic_t i_writecount
;
826 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
827 struct file_lock
*i_flock
;
828 struct address_space i_data
;
830 struct dquot
*i_dquot
[MAXQUOTAS
];
832 struct list_head i_devices
;
834 struct pipe_inode_info
*i_pipe
;
835 struct block_device
*i_bdev
;
841 #ifdef CONFIG_FSNOTIFY
842 __u32 i_fsnotify_mask
; /* all events this inode cares about */
843 struct hlist_head i_fsnotify_marks
;
847 atomic_t i_readcount
; /* struct files open RO */
849 void *i_private
; /* fs or device private pointer */
852 static inline int inode_unhashed(struct inode
*inode
)
854 return hlist_unhashed(&inode
->i_hash
);
858 * inode->i_mutex nesting subclasses for the lock validator:
860 * 0: the object of the current VFS operation
865 * The locking order between these classes is
866 * parent -> child -> normal -> xattr -> quota
868 enum inode_i_mutex_lock_class
878 * NOTE: in a 32bit arch with a preemptable kernel and
879 * an UP compile the i_size_read/write must be atomic
880 * with respect to the local cpu (unlike with preempt disabled),
881 * but they don't need to be atomic with respect to other cpus like in
882 * true SMP (so they need either to either locally disable irq around
883 * the read or for example on x86 they can be still implemented as a
884 * cmpxchg8b without the need of the lock prefix). For SMP compiles
885 * and 64bit archs it makes no difference if preempt is enabled or not.
887 static inline loff_t
i_size_read(const struct inode
*inode
)
889 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
894 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
895 i_size
= inode
->i_size
;
896 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
898 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
902 i_size
= inode
->i_size
;
906 return inode
->i_size
;
911 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
912 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
913 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
915 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
917 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
918 write_seqcount_begin(&inode
->i_size_seqcount
);
919 inode
->i_size
= i_size
;
920 write_seqcount_end(&inode
->i_size_seqcount
);
921 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
923 inode
->i_size
= i_size
;
926 inode
->i_size
= i_size
;
930 static inline unsigned iminor(const struct inode
*inode
)
932 return MINOR(inode
->i_rdev
);
935 static inline unsigned imajor(const struct inode
*inode
)
937 return MAJOR(inode
->i_rdev
);
940 extern struct block_device
*I_BDEV(struct inode
*inode
);
943 rwlock_t lock
; /* protects pid, uid, euid fields */
944 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
945 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
946 uid_t uid
, euid
; /* uid/euid of process setting the owner */
947 int signum
; /* posix.1b rt signal to be delivered on IO */
951 * Track a single file's readahead state
953 struct file_ra_state
{
954 pgoff_t start
; /* where readahead started */
955 unsigned int size
; /* # of readahead pages */
956 unsigned int async_size
; /* do asynchronous readahead when
957 there are only # of pages ahead */
959 unsigned int ra_pages
; /* Maximum readahead window */
960 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
961 loff_t prev_pos
; /* Cache last read() position */
965 * Check if @index falls in the readahead windows.
967 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
969 return (index
>= ra
->start
&&
970 index
< ra
->start
+ ra
->size
);
973 #define FILE_MNT_WRITE_TAKEN 1
974 #define FILE_MNT_WRITE_RELEASED 2
978 * fu_list becomes invalid after file_free is called and queued via
979 * fu_rcuhead for RCU freeing
982 struct list_head fu_list
;
983 struct rcu_head fu_rcuhead
;
986 #define f_dentry f_path.dentry
987 #define f_vfsmnt f_path.mnt
988 const struct file_operations
*f_op
;
991 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
992 * Must not be taken from IRQ context.
998 atomic_long_t f_count
;
999 unsigned int f_flags
;
1002 struct fown_struct f_owner
;
1003 const struct cred
*f_cred
;
1004 struct file_ra_state f_ra
;
1007 #ifdef CONFIG_SECURITY
1010 /* needed for tty driver, and maybe others */
1014 /* Used by fs/eventpoll.c to link all the hooks to this file */
1015 struct list_head f_ep_links
;
1016 struct list_head f_tfile_llink
;
1017 #endif /* #ifdef CONFIG_EPOLL */
1018 struct address_space
*f_mapping
;
1019 #ifdef CONFIG_DEBUG_WRITECOUNT
1020 unsigned long f_mnt_write_state
;
1024 struct file_handle
{
1027 /* file identifier */
1028 unsigned char f_handle
[0];
1031 #define get_file(x) atomic_long_inc(&(x)->f_count)
1032 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
1033 #define file_count(x) atomic_long_read(&(x)->f_count)
1035 #ifdef CONFIG_DEBUG_WRITECOUNT
1036 static inline void file_take_write(struct file
*f
)
1038 WARN_ON(f
->f_mnt_write_state
!= 0);
1039 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
1041 static inline void file_release_write(struct file
*f
)
1043 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
1045 static inline void file_reset_write(struct file
*f
)
1047 f
->f_mnt_write_state
= 0;
1049 static inline void file_check_state(struct file
*f
)
1052 * At this point, either both or neither of these bits
1055 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1056 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1058 static inline int file_check_writeable(struct file
*f
)
1060 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1062 printk(KERN_WARNING
"writeable file with no "
1063 "mnt_want_write()\n");
1067 #else /* !CONFIG_DEBUG_WRITECOUNT */
1068 static inline void file_take_write(struct file
*filp
) {}
1069 static inline void file_release_write(struct file
*filp
) {}
1070 static inline void file_reset_write(struct file
*filp
) {}
1071 static inline void file_check_state(struct file
*filp
) {}
1072 static inline int file_check_writeable(struct file
*filp
)
1076 #endif /* CONFIG_DEBUG_WRITECOUNT */
1078 #define MAX_NON_LFS ((1UL<<31) - 1)
1080 /* Page cache limit. The filesystems should put that into their s_maxbytes
1081 limits, otherwise bad things can happen in VM. */
1082 #if BITS_PER_LONG==32
1083 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1084 #elif BITS_PER_LONG==64
1085 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1090 #define FL_ACCESS 8 /* not trying to lock, just looking */
1091 #define FL_EXISTS 16 /* when unlocking, test for existence */
1092 #define FL_LEASE 32 /* lease held on this file */
1093 #define FL_CLOSE 64 /* unlock on close */
1094 #define FL_SLEEP 128 /* A blocking lock */
1095 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
1096 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
1099 * Special return value from posix_lock_file() and vfs_lock_file() for
1100 * asynchronous locking.
1102 #define FILE_LOCK_DEFERRED 1
1105 * The POSIX file lock owner is determined by
1106 * the "struct files_struct" in the thread group
1107 * (or NULL for no owner - BSD locks).
1109 * Lockd stuffs a "host" pointer into this.
1111 typedef struct files_struct
*fl_owner_t
;
1113 struct file_lock_operations
{
1114 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1115 void (*fl_release_private
)(struct file_lock
*);
1118 struct lock_manager_operations
{
1119 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
1120 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
1121 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
1122 void (*lm_release_private
)(struct file_lock
*);
1123 void (*lm_break
)(struct file_lock
*);
1124 int (*lm_change
)(struct file_lock
**, int);
1127 struct lock_manager
{
1128 struct list_head list
;
1131 void locks_start_grace(struct lock_manager
*);
1132 void locks_end_grace(struct lock_manager
*);
1133 int locks_in_grace(void);
1135 /* that will die - we need it for nfs_lock_info */
1136 #include <linux/nfs_fs_i.h>
1139 struct file_lock
*fl_next
; /* singly linked list for this inode */
1140 struct list_head fl_link
; /* doubly linked list of all locks */
1141 struct list_head fl_block
; /* circular list of blocked processes */
1142 fl_owner_t fl_owner
;
1143 unsigned int fl_flags
;
1144 unsigned char fl_type
;
1145 unsigned int fl_pid
;
1146 struct pid
*fl_nspid
;
1147 wait_queue_head_t fl_wait
;
1148 struct file
*fl_file
;
1152 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1153 /* for lease breaks: */
1154 unsigned long fl_break_time
;
1155 unsigned long fl_downgrade_time
;
1157 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1158 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1160 struct nfs_lock_info nfs_fl
;
1161 struct nfs4_lock_info nfs4_fl
;
1163 struct list_head link
; /* link in AFS vnode's pending_locks list */
1164 int state
; /* state of grant or error if -ve */
1169 /* The following constant reflects the upper bound of the file/locking space */
1171 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1172 #define OFFSET_MAX INT_LIMIT(loff_t)
1173 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1176 #include <linux/fcntl.h>
1178 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1180 #ifdef CONFIG_FILE_LOCKING
1181 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1182 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1183 struct flock __user
*);
1185 #if BITS_PER_LONG == 32
1186 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1187 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1188 struct flock64 __user
*);
1191 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1192 extern int fcntl_getlease(struct file
*filp
);
1195 void locks_free_lock(struct file_lock
*fl
);
1196 extern void locks_init_lock(struct file_lock
*);
1197 extern struct file_lock
* locks_alloc_lock(void);
1198 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1199 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1200 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1201 extern void locks_remove_flock(struct file
*);
1202 extern void locks_release_private(struct file_lock
*);
1203 extern void posix_test_lock(struct file
*, struct file_lock
*);
1204 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1205 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1206 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1207 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1208 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1209 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1210 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1211 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1212 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1213 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1214 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1215 extern int lease_modify(struct file_lock
**, int);
1216 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1217 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1218 extern void locks_delete_block(struct file_lock
*waiter
);
1219 extern void lock_flocks(void);
1220 extern void unlock_flocks(void);
1221 #else /* !CONFIG_FILE_LOCKING */
1222 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1227 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1228 unsigned int cmd
, struct flock __user
*user
)
1233 #if BITS_PER_LONG == 32
1234 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1239 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1240 unsigned int cmd
, struct flock64 __user
*user
)
1245 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1250 static inline int fcntl_getlease(struct file
*filp
)
1255 static inline void locks_init_lock(struct file_lock
*fl
)
1260 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1265 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1270 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1275 static inline void locks_remove_flock(struct file
*filp
)
1280 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1285 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1286 struct file_lock
*conflock
)
1291 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1296 static inline int posix_unblock_lock(struct file
*filp
,
1297 struct file_lock
*waiter
)
1302 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1307 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1308 struct file_lock
*fl
, struct file_lock
*conf
)
1313 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1318 static inline int flock_lock_file_wait(struct file
*filp
,
1319 struct file_lock
*request
)
1324 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1329 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1334 static inline int generic_setlease(struct file
*filp
, long arg
,
1335 struct file_lock
**flp
)
1340 static inline int vfs_setlease(struct file
*filp
, long arg
,
1341 struct file_lock
**lease
)
1346 static inline int lease_modify(struct file_lock
**before
, int arg
)
1351 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1357 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1363 static inline void locks_delete_block(struct file_lock
*waiter
)
1367 static inline void lock_flocks(void)
1371 static inline void unlock_flocks(void)
1375 #endif /* !CONFIG_FILE_LOCKING */
1378 struct fasync_struct
{
1382 struct fasync_struct
*fa_next
; /* singly linked list */
1383 struct file
*fa_file
;
1384 struct rcu_head fa_rcu
;
1387 #define FASYNC_MAGIC 0x4601
1389 /* SMP safe fasync helpers: */
1390 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1391 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1392 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1393 extern struct fasync_struct
*fasync_alloc(void);
1394 extern void fasync_free(struct fasync_struct
*);
1396 /* can be called from interrupts */
1397 extern void kill_fasync(struct fasync_struct
**, int, int);
1399 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1400 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1401 extern void f_delown(struct file
*filp
);
1402 extern pid_t
f_getown(struct file
*filp
);
1403 extern int send_sigurg(struct fown_struct
*fown
);
1409 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1410 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1411 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1412 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1413 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1415 extern struct list_head super_blocks
;
1416 extern spinlock_t sb_lock
;
1418 struct super_block
{
1419 struct list_head s_list
; /* Keep this first */
1420 dev_t s_dev
; /* search index; _not_ kdev_t */
1421 unsigned char s_dirt
;
1422 unsigned char s_blocksize_bits
;
1423 unsigned long s_blocksize
;
1424 loff_t s_maxbytes
; /* Max file size */
1425 struct file_system_type
*s_type
;
1426 const struct super_operations
*s_op
;
1427 const struct dquot_operations
*dq_op
;
1428 const struct quotactl_ops
*s_qcop
;
1429 const struct export_operations
*s_export_op
;
1430 unsigned long s_flags
;
1431 unsigned long s_magic
;
1432 struct dentry
*s_root
;
1433 struct rw_semaphore s_umount
;
1434 struct mutex s_lock
;
1437 #ifdef CONFIG_SECURITY
1440 const struct xattr_handler
**s_xattr
;
1442 struct list_head s_inodes
; /* all inodes */
1443 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1445 struct list_head __percpu
*s_files
;
1447 struct list_head s_files
;
1449 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1450 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1451 struct list_head s_dentry_lru
; /* unused dentry lru */
1452 int s_nr_dentry_unused
; /* # of dentry on lru */
1454 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1455 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp
;
1456 struct list_head s_inode_lru
; /* unused inode lru */
1457 int s_nr_inodes_unused
; /* # of inodes on lru */
1459 struct block_device
*s_bdev
;
1460 struct backing_dev_info
*s_bdi
;
1461 struct mtd_info
*s_mtd
;
1462 struct hlist_node s_instances
;
1463 struct quota_info s_dquot
; /* Diskquota specific options */
1466 wait_queue_head_t s_wait_unfrozen
;
1468 char s_id
[32]; /* Informational name */
1469 u8 s_uuid
[16]; /* UUID */
1471 void *s_fs_info
; /* Filesystem private info */
1472 unsigned int s_max_links
;
1475 /* Granularity of c/m/atime in ns.
1476 Cannot be worse than a second */
1480 * The next field is for VFS *only*. No filesystems have any business
1481 * even looking at it. You had been warned.
1483 struct mutex s_vfs_rename_mutex
; /* Kludge */
1486 * Filesystem subtype. If non-empty the filesystem type field
1487 * in /proc/mounts will be "type.subtype"
1492 * Saved mount options for lazy filesystems using
1493 * generic_show_options()
1495 char __rcu
*s_options
;
1496 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1499 * Saved pool identifier for cleancache (-1 means none)
1501 int cleancache_poolid
;
1503 struct shrinker s_shrink
; /* per-sb shrinker handle */
1505 /* Number of inodes with nlink == 0 but still referenced */
1506 atomic_long_t s_remove_count
;
1508 /* Being remounted read-only */
1509 int s_readonly_remount
;
1512 /* superblock cache pruning functions */
1513 extern void prune_icache_sb(struct super_block
*sb
, int nr_to_scan
);
1514 extern void prune_dcache_sb(struct super_block
*sb
, int nr_to_scan
);
1516 extern struct timespec
current_fs_time(struct super_block
*sb
);
1519 * Snapshotting support.
1523 SB_FREEZE_WRITE
= 1,
1524 SB_FREEZE_TRANS
= 2,
1527 #define vfs_check_frozen(sb, level) \
1528 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1531 * until VFS tracks user namespaces for inodes, just make all files
1532 * belong to init_user_ns
1534 extern struct user_namespace init_user_ns
;
1535 #define inode_userns(inode) (&init_user_ns)
1536 extern bool inode_owner_or_capable(const struct inode
*inode
);
1538 /* not quite ready to be deprecated, but... */
1539 extern void lock_super(struct super_block
*);
1540 extern void unlock_super(struct super_block
*);
1543 * VFS helper functions..
1545 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, struct nameidata
*);
1546 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1547 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1548 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1549 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1550 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1551 extern int vfs_unlink(struct inode
*, struct dentry
*);
1552 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1555 * VFS dentry helper functions.
1557 extern void dentry_unhash(struct dentry
*dentry
);
1560 * VFS file helper functions.
1562 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1565 * VFS FS_IOC_FIEMAP helper definitions.
1567 struct fiemap_extent_info
{
1568 unsigned int fi_flags
; /* Flags as passed from user */
1569 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1570 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1571 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1572 fiemap_extent array */
1574 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1575 u64 phys
, u64 len
, u32 flags
);
1576 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1581 * NOTE! These match bits 12..15 of stat.st_mode
1582 * (ie "(i_mode >> 12) & 15").
1584 #define DT_UNKNOWN 0
1595 * This is the "filldir" function type, used by readdir() to let
1596 * the kernel specify what kind of dirent layout it wants to have.
1597 * This allows the kernel to read directories into kernel space or
1598 * to have different dirent layouts depending on the binary type.
1600 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1601 struct block_device_operations
;
1603 /* These macros are for out of kernel modules to test that
1604 * the kernel supports the unlocked_ioctl and compat_ioctl
1605 * fields in struct file_operations. */
1606 #define HAVE_COMPAT_IOCTL 1
1607 #define HAVE_UNLOCKED_IOCTL 1
1609 struct file_operations
{
1610 struct module
*owner
;
1611 loff_t (*llseek
) (struct file
*, loff_t
, int);
1612 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1613 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1614 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1615 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1616 int (*readdir
) (struct file
*, void *, filldir_t
);
1617 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1618 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1619 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1620 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1621 int (*open
) (struct inode
*, struct file
*);
1622 int (*flush
) (struct file
*, fl_owner_t id
);
1623 int (*release
) (struct inode
*, struct file
*);
1624 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1625 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1626 int (*fasync
) (int, struct file
*, int);
1627 int (*lock
) (struct file
*, int, struct file_lock
*);
1628 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1629 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1630 int (*check_flags
)(int);
1631 int (*flock
) (struct file
*, int, struct file_lock
*);
1632 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1633 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1634 int (*setlease
)(struct file
*, long, struct file_lock
**);
1635 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1639 struct inode_operations
{
1640 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1641 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1642 int (*permission
) (struct inode
*, int);
1643 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1645 int (*readlink
) (struct dentry
*, char __user
*,int);
1646 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1648 int (*create
) (struct inode
*,struct dentry
*,umode_t
,struct nameidata
*);
1649 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1650 int (*unlink
) (struct inode
*,struct dentry
*);
1651 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1652 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1653 int (*rmdir
) (struct inode
*,struct dentry
*);
1654 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1655 int (*rename
) (struct inode
*, struct dentry
*,
1656 struct inode
*, struct dentry
*);
1657 void (*truncate
) (struct inode
*);
1658 int (*setattr
) (struct dentry
*, struct iattr
*);
1659 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1660 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1661 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1662 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1663 int (*removexattr
) (struct dentry
*, const char *);
1664 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1665 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1667 } ____cacheline_aligned
;
1671 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1672 unsigned long nr_segs
, unsigned long fast_segs
,
1673 struct iovec
*fast_pointer
,
1674 struct iovec
**ret_pointer
,
1677 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1678 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1679 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1680 unsigned long, loff_t
*);
1681 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1682 unsigned long, loff_t
*);
1684 struct super_operations
{
1685 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1686 void (*destroy_inode
)(struct inode
*);
1688 void (*dirty_inode
) (struct inode
*, int flags
);
1689 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1690 int (*drop_inode
) (struct inode
*);
1691 void (*evict_inode
) (struct inode
*);
1692 void (*put_super
) (struct super_block
*);
1693 void (*write_super
) (struct super_block
*);
1694 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1695 int (*freeze_fs
) (struct super_block
*);
1696 int (*unfreeze_fs
) (struct super_block
*);
1697 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1698 int (*remount_fs
) (struct super_block
*, int *, char *);
1699 void (*umount_begin
) (struct super_block
*);
1701 int (*show_options
)(struct seq_file
*, struct dentry
*);
1702 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1703 int (*show_path
)(struct seq_file
*, struct dentry
*);
1704 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1706 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1707 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1709 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1710 int (*nr_cached_objects
)(struct super_block
*);
1711 void (*free_cached_objects
)(struct super_block
*, int);
1715 * Inode state bits. Protected by inode->i_lock
1717 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1718 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1720 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1721 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1722 * various stages of removing an inode.
1724 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1726 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1727 * fdatasync(). i_atime is the usual cause.
1728 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1729 * these changes separately from I_DIRTY_SYNC so that we
1730 * don't have to write inode on fdatasync() when only
1731 * mtime has changed in it.
1732 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1733 * I_NEW Serves as both a mutex and completion notification.
1734 * New inodes set I_NEW. If two processes both create
1735 * the same inode, one of them will release its inode and
1736 * wait for I_NEW to be released before returning.
1737 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1738 * also cause waiting on I_NEW, without I_NEW actually
1739 * being set. find_inode() uses this to prevent returning
1740 * nearly-dead inodes.
1741 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1742 * is zero. I_FREEING must be set when I_WILL_FREE is
1744 * I_FREEING Set when inode is about to be freed but still has dirty
1745 * pages or buffers attached or the inode itself is still
1747 * I_CLEAR Added by end_writeback(). In this state the inode is clean
1748 * and can be destroyed. Inode keeps I_FREEING.
1750 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1751 * prohibited for many purposes. iget() must wait for
1752 * the inode to be completely released, then create it
1753 * anew. Other functions will just ignore such inodes,
1754 * if appropriate. I_NEW is used for waiting.
1756 * I_SYNC Synchonized write of dirty inode data. The bits is
1757 * set during data writeback, and cleared with a wakeup
1758 * on the bit address once it is done.
1760 * I_REFERENCED Marks the inode as recently references on the LRU list.
1762 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1764 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1766 #define I_DIRTY_SYNC (1 << 0)
1767 #define I_DIRTY_DATASYNC (1 << 1)
1768 #define I_DIRTY_PAGES (1 << 2)
1770 #define I_NEW (1 << __I_NEW)
1771 #define I_WILL_FREE (1 << 4)
1772 #define I_FREEING (1 << 5)
1773 #define I_CLEAR (1 << 6)
1775 #define I_SYNC (1 << __I_SYNC)
1776 #define I_REFERENCED (1 << 8)
1777 #define __I_DIO_WAKEUP 9
1778 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1780 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1782 extern void __mark_inode_dirty(struct inode
*, int);
1783 static inline void mark_inode_dirty(struct inode
*inode
)
1785 __mark_inode_dirty(inode
, I_DIRTY
);
1788 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1790 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1793 extern void inc_nlink(struct inode
*inode
);
1794 extern void drop_nlink(struct inode
*inode
);
1795 extern void clear_nlink(struct inode
*inode
);
1796 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1798 static inline void inode_inc_link_count(struct inode
*inode
)
1801 mark_inode_dirty(inode
);
1804 static inline void inode_dec_link_count(struct inode
*inode
)
1807 mark_inode_dirty(inode
);
1811 * inode_inc_iversion - increments i_version
1812 * @inode: inode that need to be updated
1814 * Every time the inode is modified, the i_version field will be incremented.
1815 * The filesystem has to be mounted with i_version flag
1818 static inline void inode_inc_iversion(struct inode
*inode
)
1820 spin_lock(&inode
->i_lock
);
1822 spin_unlock(&inode
->i_lock
);
1825 extern void touch_atime(struct path
*);
1826 static inline void file_accessed(struct file
*file
)
1828 if (!(file
->f_flags
& O_NOATIME
))
1829 touch_atime(&file
->f_path
);
1832 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1833 int sync_inode_metadata(struct inode
*inode
, int wait
);
1835 struct file_system_type
{
1838 struct dentry
*(*mount
) (struct file_system_type
*, int,
1839 const char *, void *);
1840 void (*kill_sb
) (struct super_block
*);
1841 struct module
*owner
;
1842 struct file_system_type
* next
;
1843 struct hlist_head fs_supers
;
1845 struct lock_class_key s_lock_key
;
1846 struct lock_class_key s_umount_key
;
1847 struct lock_class_key s_vfs_rename_key
;
1849 struct lock_class_key i_lock_key
;
1850 struct lock_class_key i_mutex_key
;
1851 struct lock_class_key i_mutex_dir_key
;
1854 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1855 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1856 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1857 int flags
, const char *dev_name
, void *data
,
1858 int (*fill_super
)(struct super_block
*, void *, int));
1859 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1860 int flags
, void *data
,
1861 int (*fill_super
)(struct super_block
*, void *, int));
1862 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1863 int flags
, void *data
,
1864 int (*fill_super
)(struct super_block
*, void *, int));
1865 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1866 void generic_shutdown_super(struct super_block
*sb
);
1867 void kill_block_super(struct super_block
*sb
);
1868 void kill_anon_super(struct super_block
*sb
);
1869 void kill_litter_super(struct super_block
*sb
);
1870 void deactivate_super(struct super_block
*sb
);
1871 void deactivate_locked_super(struct super_block
*sb
);
1872 int set_anon_super(struct super_block
*s
, void *data
);
1873 int get_anon_bdev(dev_t
*);
1874 void free_anon_bdev(dev_t
);
1875 struct super_block
*sget(struct file_system_type
*type
,
1876 int (*test
)(struct super_block
*,void *),
1877 int (*set
)(struct super_block
*,void *),
1879 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1880 const struct super_operations
*ops
,
1881 const struct dentry_operations
*dops
,
1884 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1885 #define fops_get(fops) \
1886 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1887 #define fops_put(fops) \
1888 do { if (fops) module_put((fops)->owner); } while(0)
1890 extern int register_filesystem(struct file_system_type
*);
1891 extern int unregister_filesystem(struct file_system_type
*);
1892 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1893 #define kern_mount(type) kern_mount_data(type, NULL)
1894 extern void kern_unmount(struct vfsmount
*mnt
);
1895 extern int may_umount_tree(struct vfsmount
*);
1896 extern int may_umount(struct vfsmount
*);
1897 extern long do_mount(char *, char *, char *, unsigned long, void *);
1898 extern struct vfsmount
*collect_mounts(struct path
*);
1899 extern void drop_collected_mounts(struct vfsmount
*);
1900 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1902 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1903 extern int user_statfs(const char __user
*, struct kstatfs
*);
1904 extern int fd_statfs(int, struct kstatfs
*);
1905 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1906 extern int freeze_super(struct super_block
*super
);
1907 extern int thaw_super(struct super_block
*super
);
1908 extern bool our_mnt(struct vfsmount
*mnt
);
1910 extern int current_umask(void);
1913 extern struct kobject
*fs_kobj
;
1915 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1916 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1918 #define FLOCK_VERIFY_READ 1
1919 #define FLOCK_VERIFY_WRITE 2
1921 #ifdef CONFIG_FILE_LOCKING
1922 extern int locks_mandatory_locked(struct inode
*);
1923 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1926 * Candidates for mandatory locking have the setgid bit set
1927 * but no group execute bit - an otherwise meaningless combination.
1930 static inline int __mandatory_lock(struct inode
*ino
)
1932 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1936 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1937 * otherwise these will be advisory locks
1940 static inline int mandatory_lock(struct inode
*ino
)
1942 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1945 static inline int locks_verify_locked(struct inode
*inode
)
1947 if (mandatory_lock(inode
))
1948 return locks_mandatory_locked(inode
);
1952 static inline int locks_verify_truncate(struct inode
*inode
,
1956 if (inode
->i_flock
&& mandatory_lock(inode
))
1957 return locks_mandatory_area(
1958 FLOCK_VERIFY_WRITE
, inode
, filp
,
1959 size
< inode
->i_size
? size
: inode
->i_size
,
1960 (size
< inode
->i_size
? inode
->i_size
- size
1961 : size
- inode
->i_size
)
1966 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1969 return __break_lease(inode
, mode
);
1972 #else /* !CONFIG_FILE_LOCKING */
1973 static inline int locks_mandatory_locked(struct inode
*inode
)
1978 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
1979 struct file
*filp
, loff_t offset
,
1985 static inline int __mandatory_lock(struct inode
*inode
)
1990 static inline int mandatory_lock(struct inode
*inode
)
1995 static inline int locks_verify_locked(struct inode
*inode
)
2000 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2006 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2011 #endif /* CONFIG_FILE_LOCKING */
2015 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2017 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2019 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2021 extern struct file
*filp_open(const char *, int, umode_t
);
2022 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2024 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
2025 const struct cred
*);
2026 extern int filp_close(struct file
*, fl_owner_t id
);
2027 extern char * getname(const char __user
*);
2031 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2034 extern void __init
vfs_caches_init_early(void);
2035 extern void __init
vfs_caches_init(unsigned long);
2037 extern struct kmem_cache
*names_cachep
;
2039 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2040 #define __getname() __getname_gfp(GFP_KERNEL)
2041 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2042 #ifndef CONFIG_AUDITSYSCALL
2043 #define putname(name) __putname(name)
2045 extern void putname(const char *name
);
2049 extern int register_blkdev(unsigned int, const char *);
2050 extern void unregister_blkdev(unsigned int, const char *);
2051 extern struct block_device
*bdget(dev_t
);
2052 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2053 extern void bd_set_size(struct block_device
*, loff_t size
);
2054 extern void bd_forget(struct inode
*inode
);
2055 extern void bdput(struct block_device
*);
2056 extern void invalidate_bdev(struct block_device
*);
2057 extern int sync_blockdev(struct block_device
*bdev
);
2058 extern void kill_bdev(struct block_device
*);
2059 extern struct super_block
*freeze_bdev(struct block_device
*);
2060 extern void emergency_thaw_all(void);
2061 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2062 extern int fsync_bdev(struct block_device
*);
2064 static inline void bd_forget(struct inode
*inode
) {}
2065 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2066 static inline void kill_bdev(struct block_device
*bdev
) {}
2067 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2069 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2074 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2079 extern int sync_filesystem(struct super_block
*);
2080 extern const struct file_operations def_blk_fops
;
2081 extern const struct file_operations def_chr_fops
;
2082 extern const struct file_operations bad_sock_fops
;
2083 extern const struct file_operations def_fifo_fops
;
2085 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2086 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2087 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2088 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2089 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2091 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2093 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2095 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2096 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2097 struct gendisk
*disk
);
2099 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2100 struct gendisk
*disk
)
2104 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2105 struct gendisk
*disk
)
2112 #define CHRDEV_MAJOR_HASH_SIZE 255
2113 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2114 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2115 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2116 unsigned int count
, const char *name
,
2117 const struct file_operations
*fops
);
2118 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2119 unsigned int count
, const char *name
);
2120 extern void unregister_chrdev_region(dev_t
, unsigned);
2121 extern void chrdev_show(struct seq_file
*,off_t
);
2123 static inline int register_chrdev(unsigned int major
, const char *name
,
2124 const struct file_operations
*fops
)
2126 return __register_chrdev(major
, 0, 256, name
, fops
);
2129 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2131 __unregister_chrdev(major
, 0, 256, name
);
2134 /* fs/block_dev.c */
2135 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2136 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2139 #define BLKDEV_MAJOR_HASH_SIZE 255
2140 extern const char *__bdevname(dev_t
, char *buffer
);
2141 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2142 extern struct block_device
*lookup_bdev(const char *);
2143 extern void blkdev_show(struct seq_file
*,off_t
);
2146 #define BLKDEV_MAJOR_HASH_SIZE 0
2149 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2151 /* Invalid inode operations -- fs/bad_inode.c */
2152 extern void make_bad_inode(struct inode
*);
2153 extern int is_bad_inode(struct inode
*);
2155 extern const struct file_operations read_pipefifo_fops
;
2156 extern const struct file_operations write_pipefifo_fops
;
2157 extern const struct file_operations rdwr_pipefifo_fops
;
2161 * return READ, READA, or WRITE
2163 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2166 * return data direction, READ or WRITE
2168 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2170 extern void check_disk_size_change(struct gendisk
*disk
,
2171 struct block_device
*bdev
);
2172 extern int revalidate_disk(struct gendisk
*);
2173 extern int check_disk_change(struct block_device
*);
2174 extern int __invalidate_device(struct block_device
*, bool);
2175 extern int invalidate_partition(struct gendisk
*, int);
2177 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2178 pgoff_t start
, pgoff_t end
);
2180 static inline void invalidate_remote_inode(struct inode
*inode
)
2182 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2183 S_ISLNK(inode
->i_mode
))
2184 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2186 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2187 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2188 pgoff_t start
, pgoff_t end
);
2189 extern int write_inode_now(struct inode
*, int);
2190 extern int filemap_fdatawrite(struct address_space
*);
2191 extern int filemap_flush(struct address_space
*);
2192 extern int filemap_fdatawait(struct address_space
*);
2193 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2195 extern int filemap_write_and_wait(struct address_space
*mapping
);
2196 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2197 loff_t lstart
, loff_t lend
);
2198 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2199 loff_t start
, loff_t end
, int sync_mode
);
2200 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2201 loff_t start
, loff_t end
);
2203 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2205 extern int vfs_fsync(struct file
*file
, int datasync
);
2206 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2207 extern void sync_supers(void);
2208 extern void emergency_sync(void);
2209 extern void emergency_remount(void);
2211 extern sector_t
bmap(struct inode
*, sector_t
);
2213 extern int notify_change(struct dentry
*, struct iattr
*);
2214 extern int inode_permission(struct inode
*, int);
2215 extern int generic_permission(struct inode
*, int);
2217 static inline bool execute_ok(struct inode
*inode
)
2219 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2223 * get_write_access() gets write permission for a file.
2224 * put_write_access() releases this write permission.
2225 * This is used for regular files.
2226 * We cannot support write (and maybe mmap read-write shared) accesses and
2227 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2228 * can have the following values:
2229 * 0: no writers, no VM_DENYWRITE mappings
2230 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2231 * > 0: (i_writecount) users are writing to the file.
2233 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2234 * except for the cases where we don't hold i_writecount yet. Then we need to
2235 * use {get,deny}_write_access() - these functions check the sign and refuse
2236 * to do the change if sign is wrong.
2238 static inline int get_write_access(struct inode
*inode
)
2240 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2242 static inline int deny_write_access(struct file
*file
)
2244 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2245 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2247 static inline void put_write_access(struct inode
* inode
)
2249 atomic_dec(&inode
->i_writecount
);
2251 static inline void allow_write_access(struct file
*file
)
2254 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2257 static inline void i_readcount_dec(struct inode
*inode
)
2259 BUG_ON(!atomic_read(&inode
->i_readcount
));
2260 atomic_dec(&inode
->i_readcount
);
2262 static inline void i_readcount_inc(struct inode
*inode
)
2264 atomic_inc(&inode
->i_readcount
);
2267 static inline void i_readcount_dec(struct inode
*inode
)
2271 static inline void i_readcount_inc(struct inode
*inode
)
2276 extern int do_pipe_flags(int *, int);
2277 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2278 extern struct file
*create_write_pipe(int flags
);
2279 extern void free_write_pipe(struct file
*);
2281 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2282 extern struct file
* open_exec(const char *);
2284 /* fs/dcache.c -- generic fs support functions */
2285 extern int is_subdir(struct dentry
*, struct dentry
*);
2286 extern int path_is_under(struct path
*, struct path
*);
2287 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2289 #include <linux/err.h>
2291 /* needed for stackable file system support */
2292 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2294 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2296 extern int inode_init_always(struct super_block
*, struct inode
*);
2297 extern void inode_init_once(struct inode
*);
2298 extern void address_space_init_once(struct address_space
*mapping
);
2299 extern void ihold(struct inode
* inode
);
2300 extern void iput(struct inode
*);
2301 extern struct inode
* igrab(struct inode
*);
2302 extern ino_t
iunique(struct super_block
*, ino_t
);
2303 extern int inode_needs_sync(struct inode
*inode
);
2304 extern int generic_delete_inode(struct inode
*inode
);
2305 static inline int generic_drop_inode(struct inode
*inode
)
2307 return !inode
->i_nlink
|| inode_unhashed(inode
);
2310 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2311 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2313 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2314 int (*test
)(struct inode
*, void *), void *data
);
2315 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2317 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2318 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2319 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2320 extern int insert_inode_locked(struct inode
*);
2321 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2322 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2324 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2326 extern void unlock_new_inode(struct inode
*);
2327 extern unsigned int get_next_ino(void);
2329 extern void __iget(struct inode
* inode
);
2330 extern void iget_failed(struct inode
*);
2331 extern void end_writeback(struct inode
*);
2332 extern void __destroy_inode(struct inode
*);
2333 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2334 extern struct inode
*new_inode(struct super_block
*sb
);
2335 extern void free_inode_nonrcu(struct inode
*inode
);
2336 extern int should_remove_suid(struct dentry
*);
2337 extern int file_remove_suid(struct file
*);
2339 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2340 static inline void insert_inode_hash(struct inode
*inode
)
2342 __insert_inode_hash(inode
, inode
->i_ino
);
2345 extern void __remove_inode_hash(struct inode
*);
2346 static inline void remove_inode_hash(struct inode
*inode
)
2348 if (!inode_unhashed(inode
))
2349 __remove_inode_hash(inode
);
2352 extern void inode_sb_list_add(struct inode
*inode
);
2355 extern void submit_bio(int, struct bio
*);
2356 extern int bdev_read_only(struct block_device
*);
2358 extern int set_blocksize(struct block_device
*, int);
2359 extern int sb_set_blocksize(struct super_block
*, int);
2360 extern int sb_min_blocksize(struct super_block
*, int);
2362 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2363 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2364 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2365 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2366 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2367 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2369 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2370 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2371 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2372 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2373 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2374 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2375 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2376 extern int generic_segment_checks(const struct iovec
*iov
,
2377 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2379 /* fs/block_dev.c */
2380 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2381 unsigned long nr_segs
, loff_t pos
);
2382 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2384 extern void block_sync_page(struct page
*page
);
2387 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2388 struct pipe_inode_info
*, size_t, unsigned int);
2389 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2390 struct pipe_inode_info
*, size_t, unsigned int);
2391 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2392 struct file
*, loff_t
*, size_t, unsigned int);
2393 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2394 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2395 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2396 size_t len
, unsigned int flags
);
2399 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2400 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2401 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2402 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2403 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2404 int origin
, loff_t maxsize
);
2405 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2406 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2408 #ifdef CONFIG_FS_XIP
2409 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2411 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2412 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2413 size_t len
, loff_t
*ppos
);
2414 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2416 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2423 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2424 loff_t file_offset
);
2427 /* need locking between buffered and direct access */
2430 /* filesystem does not support filling holes */
2431 DIO_SKIP_HOLES
= 0x02,
2434 void dio_end_io(struct bio
*bio
, int error
);
2435 void inode_dio_wait(struct inode
*inode
);
2436 void inode_dio_done(struct inode
*inode
);
2438 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2439 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2440 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2441 dio_submit_t submit_io
, int flags
);
2443 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2444 struct inode
*inode
, const struct iovec
*iov
, loff_t offset
,
2445 unsigned long nr_segs
, get_block_t get_block
)
2447 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2448 offset
, nr_segs
, get_block
, NULL
, NULL
,
2449 DIO_LOCKING
| DIO_SKIP_HOLES
);
2452 static inline void inode_dio_wait(struct inode
*inode
)
2457 extern const struct file_operations generic_ro_fops
;
2459 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2461 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2462 extern int vfs_follow_link(struct nameidata
*, const char *);
2463 extern int page_readlink(struct dentry
*, char __user
*, int);
2464 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2465 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2466 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2468 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2469 extern const struct inode_operations page_symlink_inode_operations
;
2470 extern int generic_readlink(struct dentry
*, char __user
*, int);
2471 extern void generic_fillattr(struct inode
*, struct kstat
*);
2472 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2473 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2474 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2475 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2476 loff_t
inode_get_bytes(struct inode
*inode
);
2477 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2479 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2481 extern int vfs_stat(const char __user
*, struct kstat
*);
2482 extern int vfs_lstat(const char __user
*, struct kstat
*);
2483 extern int vfs_fstat(unsigned int, struct kstat
*);
2484 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2486 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2488 extern int __generic_block_fiemap(struct inode
*inode
,
2489 struct fiemap_extent_info
*fieinfo
,
2490 loff_t start
, loff_t len
,
2491 get_block_t
*get_block
);
2492 extern int generic_block_fiemap(struct inode
*inode
,
2493 struct fiemap_extent_info
*fieinfo
, u64 start
,
2494 u64 len
, get_block_t
*get_block
);
2496 extern void get_filesystem(struct file_system_type
*fs
);
2497 extern void put_filesystem(struct file_system_type
*fs
);
2498 extern struct file_system_type
*get_fs_type(const char *name
);
2499 extern struct super_block
*get_super(struct block_device
*);
2500 extern struct super_block
*get_super_thawed(struct block_device
*);
2501 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2502 extern void drop_super(struct super_block
*sb
);
2503 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2504 extern void iterate_supers_type(struct file_system_type
*,
2505 void (*)(struct super_block
*, void *), void *);
2507 extern int dcache_dir_open(struct inode
*, struct file
*);
2508 extern int dcache_dir_close(struct inode
*, struct file
*);
2509 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2510 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2511 extern int simple_setattr(struct dentry
*, struct iattr
*);
2512 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2513 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2514 extern int simple_open(struct inode
*inode
, struct file
*file
);
2515 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2516 extern int simple_unlink(struct inode
*, struct dentry
*);
2517 extern int simple_rmdir(struct inode
*, struct dentry
*);
2518 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2519 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2520 extern int simple_empty(struct dentry
*);
2521 extern int simple_readpage(struct file
*file
, struct page
*page
);
2522 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2523 loff_t pos
, unsigned len
, unsigned flags
,
2524 struct page
**pagep
, void **fsdata
);
2525 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2526 loff_t pos
, unsigned len
, unsigned copied
,
2527 struct page
*page
, void *fsdata
);
2529 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2530 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2531 extern const struct file_operations simple_dir_operations
;
2532 extern const struct inode_operations simple_dir_inode_operations
;
2533 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2534 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2535 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2536 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2537 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2539 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2540 loff_t
*ppos
, const void *from
, size_t available
);
2541 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2542 const void __user
*from
, size_t count
);
2544 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2546 extern int generic_check_addressable(unsigned, u64
);
2548 #ifdef CONFIG_MIGRATION
2549 extern int buffer_migrate_page(struct address_space
*,
2550 struct page
*, struct page
*,
2553 #define buffer_migrate_page NULL
2556 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2557 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2558 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2560 extern void file_update_time(struct file
*file
);
2562 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2563 extern void save_mount_options(struct super_block
*sb
, char *options
);
2564 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2566 static inline ino_t
parent_ino(struct dentry
*dentry
)
2571 * Don't strictly need d_lock here? If the parent ino could change
2572 * then surely we'd have a deeper race in the caller?
2574 spin_lock(&dentry
->d_lock
);
2575 res
= dentry
->d_parent
->d_inode
->i_ino
;
2576 spin_unlock(&dentry
->d_lock
);
2580 /* Transaction based IO helpers */
2583 * An argresp is stored in an allocated page and holds the
2584 * size of the argument or response, along with its content
2586 struct simple_transaction_argresp
{
2591 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2593 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2595 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2596 size_t size
, loff_t
*pos
);
2597 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2599 void simple_transaction_set(struct file
*file
, size_t n
);
2602 * simple attribute files
2604 * These attributes behave similar to those in sysfs:
2606 * Writing to an attribute immediately sets a value, an open file can be
2607 * written to multiple times.
2609 * Reading from an attribute creates a buffer from the value that might get
2610 * read with multiple read calls. When the attribute has been read
2611 * completely, no further read calls are possible until the file is opened
2614 * All attributes contain a text representation of a numeric value
2615 * that are accessed with the get() and set() functions.
2617 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2618 static int __fops ## _open(struct inode *inode, struct file *file) \
2620 __simple_attr_check_format(__fmt, 0ull); \
2621 return simple_attr_open(inode, file, __get, __set, __fmt); \
2623 static const struct file_operations __fops = { \
2624 .owner = THIS_MODULE, \
2625 .open = __fops ## _open, \
2626 .release = simple_attr_release, \
2627 .read = simple_attr_read, \
2628 .write = simple_attr_write, \
2629 .llseek = generic_file_llseek, \
2632 static inline __printf(1, 2)
2633 void __simple_attr_check_format(const char *fmt
, ...)
2635 /* don't do anything, just let the compiler check the arguments; */
2638 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2639 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2641 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2642 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2643 size_t len
, loff_t
*ppos
);
2644 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2645 size_t len
, loff_t
*ppos
);
2648 int proc_nr_files(struct ctl_table
*table
, int write
,
2649 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2650 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2651 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2652 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2653 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2654 int __init
get_filesystem_list(char *buf
);
2656 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2657 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2659 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2660 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2661 (flag & __FMODE_NONOTIFY)))
2663 static inline int is_sxid(umode_t mode
)
2665 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2668 static inline void inode_has_no_xattr(struct inode
*inode
)
2670 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2671 inode
->i_flags
|= S_NOSEC
;
2674 #endif /* __KERNEL__ */
2675 #endif /* _LINUX_FS_H */