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)
178 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
179 * that indicates that they should check the contents of the iovec are
180 * valid, but not check the memory that the iovec elements
183 #define CHECK_IOVEC_ONLY -1
189 /* public flags for file_system_type */
190 #define FS_REQUIRES_DEV 1
191 #define FS_BINARY_MOUNTDATA 2
192 #define FS_HAS_SUBTYPE 4
193 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
194 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
195 * during rename() internally.
199 * These are the fs-independent mount-flags: up to 32 flags are supported
201 #define MS_RDONLY 1 /* Mount read-only */
202 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
203 #define MS_NODEV 4 /* Disallow access to device special files */
204 #define MS_NOEXEC 8 /* Disallow program execution */
205 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
206 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
207 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
208 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
209 #define MS_NOATIME 1024 /* Do not update access times. */
210 #define MS_NODIRATIME 2048 /* Do not update directory access times */
214 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
215 MS_VERBOSE is deprecated. */
216 #define MS_SILENT 32768
217 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
218 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
219 #define MS_PRIVATE (1<<18) /* change to private */
220 #define MS_SLAVE (1<<19) /* change to slave */
221 #define MS_SHARED (1<<20) /* change to shared */
222 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
223 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
224 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
225 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
226 #define MS_NOSEC (1<<28)
227 #define MS_BORN (1<<29)
228 #define MS_ACTIVE (1<<30)
229 #define MS_NOUSER (1<<31)
232 * Superblock flags that can be altered by MS_REMOUNT
234 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
237 * Old magic mount flag and mask
239 #define MS_MGC_VAL 0xC0ED0000
240 #define MS_MGC_MSK 0xffff0000
242 /* Inode flags - they have nothing to superblock flags now */
244 #define S_SYNC 1 /* Writes are synced at once */
245 #define S_NOATIME 2 /* Do not update access times */
246 #define S_APPEND 4 /* Append-only file */
247 #define S_IMMUTABLE 8 /* Immutable file */
248 #define S_DEAD 16 /* removed, but still open directory */
249 #define S_NOQUOTA 32 /* Inode is not counted to quota */
250 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
251 #define S_NOCMTIME 128 /* Do not update file c/mtime */
252 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
253 #define S_PRIVATE 512 /* Inode is fs-internal */
254 #define S_IMA 1024 /* Inode has an associated IMA struct */
255 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
256 #define S_NOSEC 4096 /* no suid or xattr security attributes */
259 * Note that nosuid etc flags are inode-specific: setting some file-system
260 * flags just means all the inodes inherit those flags by default. It might be
261 * possible to override it selectively if you really wanted to with some
262 * ioctl() that is not currently implemented.
264 * Exception: MS_RDONLY is always applied to the entire file system.
266 * Unfortunately, it is possible to change a filesystems flags with it mounted
267 * with files in use. This means that all of the inodes will not have their
268 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
269 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
271 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
273 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
274 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
275 ((inode)->i_flags & S_SYNC))
276 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
277 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
278 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
279 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
280 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
282 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
283 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
284 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
285 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
287 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
288 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
289 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
290 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
291 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
292 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
293 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
295 /* the read-only stuff doesn't really belong here, but any other place is
296 probably as bad and I don't want to create yet another include file. */
298 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
299 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
300 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
301 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
302 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
303 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
304 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
305 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
306 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
307 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
308 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
309 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
311 #define BLKPG _IO(0x12,105)/* See blkpg.h */
313 /* Some people are morons. Do not use sizeof! */
315 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
316 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
317 /* This was here just to show that the number is taken -
318 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
320 /* A jump here: 108-111 have been used for various private purposes. */
321 #define BLKBSZGET _IOR(0x12,112,size_t)
322 #define BLKBSZSET _IOW(0x12,113,size_t)
323 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
324 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
325 #define BLKTRACESTART _IO(0x12,116)
326 #define BLKTRACESTOP _IO(0x12,117)
327 #define BLKTRACETEARDOWN _IO(0x12,118)
328 #define BLKDISCARD _IO(0x12,119)
329 #define BLKIOMIN _IO(0x12,120)
330 #define BLKIOOPT _IO(0x12,121)
331 #define BLKALIGNOFF _IO(0x12,122)
332 #define BLKPBSZGET _IO(0x12,123)
333 #define BLKDISCARDZEROES _IO(0x12,124)
334 #define BLKSECDISCARD _IO(0x12,125)
335 #define BLKROTATIONAL _IO(0x12,126)
337 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
338 #define FIBMAP _IO(0x00,1) /* bmap access */
339 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
340 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
341 #define FITHAW _IOWR('X', 120, int) /* Thaw */
342 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
344 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
345 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
346 #define FS_IOC_GETVERSION _IOR('v', 1, long)
347 #define FS_IOC_SETVERSION _IOW('v', 2, long)
348 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
349 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
350 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
351 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
352 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
355 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
357 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
358 #define FS_UNRM_FL 0x00000002 /* Undelete */
359 #define FS_COMPR_FL 0x00000004 /* Compress file */
360 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
361 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
362 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
363 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
364 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
365 /* Reserved for compression usage... */
366 #define FS_DIRTY_FL 0x00000100
367 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
368 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
369 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
370 /* End compression flags --- maybe not all used */
371 #define FS_BTREE_FL 0x00001000 /* btree format dir */
372 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
373 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
374 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
375 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
376 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
377 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
378 #define FS_EXTENT_FL 0x00080000 /* Extents */
379 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
380 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
381 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
383 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
384 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
387 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
388 #define SYNC_FILE_RANGE_WRITE 2
389 #define SYNC_FILE_RANGE_WAIT_AFTER 4
393 #include <linux/linkage.h>
394 #include <linux/wait.h>
395 #include <linux/kdev_t.h>
396 #include <linux/dcache.h>
397 #include <linux/path.h>
398 #include <linux/stat.h>
399 #include <linux/cache.h>
400 #include <linux/list.h>
401 #include <linux/radix-tree.h>
402 #include <linux/prio_tree.h>
403 #include <linux/init.h>
404 #include <linux/pid.h>
405 #include <linux/bug.h>
406 #include <linux/mutex.h>
407 #include <linux/capability.h>
408 #include <linux/semaphore.h>
409 #include <linux/fiemap.h>
410 #include <linux/rculist_bl.h>
411 #include <linux/atomic.h>
412 #include <linux/shrinker.h>
413 #include <linux/migrate_mode.h>
414 #include <linux/uidgid.h>
416 #include <asm/byteorder.h>
418 struct export_operations
;
424 struct pipe_inode_info
;
425 struct poll_table_struct
;
427 struct vm_area_struct
;
432 extern void __init
inode_init(void);
433 extern void __init
inode_init_early(void);
434 extern void __init
files_init(unsigned long);
436 extern struct files_stat_struct files_stat
;
437 extern unsigned long get_max_files(void);
438 extern int sysctl_nr_open
;
439 extern struct inodes_stat_t inodes_stat
;
440 extern int leases_enable
, lease_break_time
;
443 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
444 struct buffer_head
*bh_result
, int create
);
445 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
446 ssize_t bytes
, void *private, int ret
,
450 * Attribute flags. These should be or-ed together to figure out what
453 #define ATTR_MODE (1 << 0)
454 #define ATTR_UID (1 << 1)
455 #define ATTR_GID (1 << 2)
456 #define ATTR_SIZE (1 << 3)
457 #define ATTR_ATIME (1 << 4)
458 #define ATTR_MTIME (1 << 5)
459 #define ATTR_CTIME (1 << 6)
460 #define ATTR_ATIME_SET (1 << 7)
461 #define ATTR_MTIME_SET (1 << 8)
462 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
463 #define ATTR_ATTR_FLAG (1 << 10)
464 #define ATTR_KILL_SUID (1 << 11)
465 #define ATTR_KILL_SGID (1 << 12)
466 #define ATTR_FILE (1 << 13)
467 #define ATTR_KILL_PRIV (1 << 14)
468 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
469 #define ATTR_TIMES_SET (1 << 16)
472 * This is the Inode Attributes structure, used for notify_change(). It
473 * uses the above definitions as flags, to know which values have changed.
474 * Also, in this manner, a Filesystem can look at only the values it cares
475 * about. Basically, these are the attributes that the VFS layer can
476 * request to change from the FS layer.
478 * Derek Atkins <warlord@MIT.EDU> 94-10-20
481 unsigned int ia_valid
;
486 struct timespec ia_atime
;
487 struct timespec ia_mtime
;
488 struct timespec ia_ctime
;
491 * Not an attribute, but an auxiliary info for filesystems wanting to
492 * implement an ftruncate() like method. NOTE: filesystem should
493 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
495 struct file
*ia_file
;
499 * Includes for diskquotas.
501 #include <linux/quota.h>
504 * enum positive_aop_returns - aop return codes with specific semantics
506 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
507 * completed, that the page is still locked, and
508 * should be considered active. The VM uses this hint
509 * to return the page to the active list -- it won't
510 * be a candidate for writeback again in the near
511 * future. Other callers must be careful to unlock
512 * the page if they get this return. Returned by
515 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
516 * unlocked it and the page might have been truncated.
517 * The caller should back up to acquiring a new page and
518 * trying again. The aop will be taking reasonable
519 * precautions not to livelock. If the caller held a page
520 * reference, it should drop it before retrying. Returned
523 * address_space_operation functions return these large constants to indicate
524 * special semantics to the caller. These are much larger than the bytes in a
525 * page to allow for functions that return the number of bytes operated on in a
529 enum positive_aop_returns
{
530 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
531 AOP_TRUNCATED_PAGE
= 0x80001,
534 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
535 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
536 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
537 * helper code (eg buffer layer)
538 * to clear GFP_FS from alloc */
541 * oh the beauties of C type declarations.
544 struct address_space
;
545 struct writeback_control
;
548 const struct iovec
*iov
;
549 unsigned long nr_segs
;
554 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
555 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
556 size_t iov_iter_copy_from_user(struct page
*page
,
557 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
558 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
559 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
560 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
562 static inline void iov_iter_init(struct iov_iter
*i
,
563 const struct iovec
*iov
, unsigned long nr_segs
,
564 size_t count
, size_t written
)
567 i
->nr_segs
= nr_segs
;
569 i
->count
= count
+ written
;
571 iov_iter_advance(i
, written
);
574 static inline size_t iov_iter_count(struct iov_iter
*i
)
580 * "descriptor" for what we're up to with a read.
581 * This allows us to use the same read code yet
582 * have multiple different users of the data that
583 * we read from a file.
585 * The simplest case just copies the data to user
598 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
599 unsigned long, unsigned long);
601 struct address_space_operations
{
602 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
603 int (*readpage
)(struct file
*, struct page
*);
605 /* Write back some dirty pages from this mapping. */
606 int (*writepages
)(struct address_space
*, struct writeback_control
*);
608 /* Set a page dirty. Return true if this dirtied it */
609 int (*set_page_dirty
)(struct page
*page
);
611 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
612 struct list_head
*pages
, unsigned nr_pages
);
614 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
615 loff_t pos
, unsigned len
, unsigned flags
,
616 struct page
**pagep
, void **fsdata
);
617 int (*write_end
)(struct file
*, struct address_space
*mapping
,
618 loff_t pos
, unsigned len
, unsigned copied
,
619 struct page
*page
, void *fsdata
);
621 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
622 sector_t (*bmap
)(struct address_space
*, sector_t
);
623 void (*invalidatepage
) (struct page
*, unsigned long);
624 int (*releasepage
) (struct page
*, gfp_t
);
625 void (*freepage
)(struct page
*);
626 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
627 loff_t offset
, unsigned long nr_segs
);
628 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
629 void **, unsigned long *);
631 * migrate the contents of a page to the specified target. If sync
632 * is false, it must not block.
634 int (*migratepage
) (struct address_space
*,
635 struct page
*, struct page
*, enum migrate_mode
);
636 int (*launder_page
) (struct page
*);
637 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
639 int (*error_remove_page
)(struct address_space
*, struct page
*);
642 extern const struct address_space_operations empty_aops
;
645 * pagecache_write_begin/pagecache_write_end must be used by general code
646 * to write into the pagecache.
648 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
649 loff_t pos
, unsigned len
, unsigned flags
,
650 struct page
**pagep
, void **fsdata
);
652 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
653 loff_t pos
, unsigned len
, unsigned copied
,
654 struct page
*page
, void *fsdata
);
656 struct backing_dev_info
;
657 struct address_space
{
658 struct inode
*host
; /* owner: inode, block_device */
659 struct radix_tree_root page_tree
; /* radix tree of all pages */
660 spinlock_t tree_lock
; /* and lock protecting it */
661 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
662 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
663 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
664 struct mutex i_mmap_mutex
; /* protect tree, count, list */
665 /* Protected by tree_lock together with the radix tree */
666 unsigned long nrpages
; /* number of total pages */
667 pgoff_t writeback_index
;/* writeback starts here */
668 const struct address_space_operations
*a_ops
; /* methods */
669 unsigned long flags
; /* error bits/gfp mask */
670 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
671 spinlock_t private_lock
; /* for use by the address_space */
672 struct list_head private_list
; /* ditto */
673 struct address_space
*assoc_mapping
; /* ditto */
674 } __attribute__((aligned(sizeof(long))));
676 * On most architectures that alignment is already the case; but
677 * must be enforced here for CRIS, to let the least significant bit
678 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
680 struct request_queue
;
682 struct block_device
{
683 dev_t bd_dev
; /* not a kdev_t - it's a search key */
685 struct inode
* bd_inode
; /* will die */
686 struct super_block
* bd_super
;
687 struct mutex bd_mutex
; /* open/close mutex */
688 struct list_head bd_inodes
;
692 bool bd_write_holder
;
694 struct list_head bd_holder_disks
;
696 struct block_device
* bd_contains
;
697 unsigned bd_block_size
;
698 struct hd_struct
* bd_part
;
699 /* number of times partitions within this device have been opened. */
700 unsigned bd_part_count
;
702 struct gendisk
* bd_disk
;
703 struct request_queue
* bd_queue
;
704 struct list_head bd_list
;
706 * Private data. You must have bd_claim'ed the block_device
707 * to use this. NOTE: bd_claim allows an owner to claim
708 * the same device multiple times, the owner must take special
709 * care to not mess up bd_private for that case.
711 unsigned long bd_private
;
713 /* The counter of freeze processes */
714 int bd_fsfreeze_count
;
715 /* Mutex for freeze */
716 struct mutex bd_fsfreeze_mutex
;
720 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
723 #define PAGECACHE_TAG_DIRTY 0
724 #define PAGECACHE_TAG_WRITEBACK 1
725 #define PAGECACHE_TAG_TOWRITE 2
727 int mapping_tagged(struct address_space
*mapping
, int tag
);
730 * Might pages of this file be mapped into userspace?
732 static inline int mapping_mapped(struct address_space
*mapping
)
734 return !prio_tree_empty(&mapping
->i_mmap
) ||
735 !list_empty(&mapping
->i_mmap_nonlinear
);
739 * Might pages of this file have been modified in userspace?
740 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
741 * marks vma as VM_SHARED if it is shared, and the file was opened for
742 * writing i.e. vma may be mprotected writable even if now readonly.
744 static inline int mapping_writably_mapped(struct address_space
*mapping
)
746 return mapping
->i_mmap_writable
!= 0;
750 * Use sequence counter to get consistent i_size on 32-bit processors.
752 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
753 #include <linux/seqlock.h>
754 #define __NEED_I_SIZE_ORDERED
755 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
757 #define i_size_ordered_init(inode) do { } while (0)
761 #define ACL_NOT_CACHED ((void *)(-1))
763 #define IOP_FASTPERM 0x0001
764 #define IOP_LOOKUP 0x0002
765 #define IOP_NOFOLLOW 0x0004
768 * Keep mostly read-only and often accessed (especially for
769 * the RCU path lookup and 'stat' data) fields at the beginning
770 * of the 'struct inode'
774 unsigned short i_opflags
;
777 unsigned int i_flags
;
779 #ifdef CONFIG_FS_POSIX_ACL
780 struct posix_acl
*i_acl
;
781 struct posix_acl
*i_default_acl
;
784 const struct inode_operations
*i_op
;
785 struct super_block
*i_sb
;
786 struct address_space
*i_mapping
;
788 #ifdef CONFIG_SECURITY
792 /* Stat data, not accessed from path walking */
795 * Filesystems may only read i_nlink directly. They shall use the
796 * following functions for modification:
798 * (set|clear|inc|drop)_nlink
799 * inode_(inc|dec)_link_count
802 const unsigned int i_nlink
;
803 unsigned int __i_nlink
;
807 struct timespec i_atime
;
808 struct timespec i_mtime
;
809 struct timespec i_ctime
;
810 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
811 unsigned short i_bytes
;
812 unsigned int i_blkbits
;
815 #ifdef __NEED_I_SIZE_ORDERED
816 seqcount_t i_size_seqcount
;
820 unsigned long i_state
;
821 struct mutex i_mutex
;
823 unsigned long dirtied_when
; /* jiffies of first dirtying */
825 struct hlist_node i_hash
;
826 struct list_head i_wb_list
; /* backing dev IO list */
827 struct list_head i_lru
; /* inode LRU list */
828 struct list_head i_sb_list
;
830 struct hlist_head i_dentry
;
831 struct rcu_head i_rcu
;
835 atomic_t i_dio_count
;
836 atomic_t i_writecount
;
837 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
838 struct file_lock
*i_flock
;
839 struct address_space i_data
;
841 struct dquot
*i_dquot
[MAXQUOTAS
];
843 struct list_head i_devices
;
845 struct pipe_inode_info
*i_pipe
;
846 struct block_device
*i_bdev
;
852 #ifdef CONFIG_FSNOTIFY
853 __u32 i_fsnotify_mask
; /* all events this inode cares about */
854 struct hlist_head i_fsnotify_marks
;
858 atomic_t i_readcount
; /* struct files open RO */
860 void *i_private
; /* fs or device private pointer */
863 static inline int inode_unhashed(struct inode
*inode
)
865 return hlist_unhashed(&inode
->i_hash
);
869 * inode->i_mutex nesting subclasses for the lock validator:
871 * 0: the object of the current VFS operation
876 * The locking order between these classes is
877 * parent -> child -> normal -> xattr -> quota
879 enum inode_i_mutex_lock_class
889 * NOTE: in a 32bit arch with a preemptable kernel and
890 * an UP compile the i_size_read/write must be atomic
891 * with respect to the local cpu (unlike with preempt disabled),
892 * but they don't need to be atomic with respect to other cpus like in
893 * true SMP (so they need either to either locally disable irq around
894 * the read or for example on x86 they can be still implemented as a
895 * cmpxchg8b without the need of the lock prefix). For SMP compiles
896 * and 64bit archs it makes no difference if preempt is enabled or not.
898 static inline loff_t
i_size_read(const struct inode
*inode
)
900 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
905 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
906 i_size
= inode
->i_size
;
907 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
909 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
913 i_size
= inode
->i_size
;
917 return inode
->i_size
;
922 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
923 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
924 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
926 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
928 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
929 write_seqcount_begin(&inode
->i_size_seqcount
);
930 inode
->i_size
= i_size
;
931 write_seqcount_end(&inode
->i_size_seqcount
);
932 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
934 inode
->i_size
= i_size
;
937 inode
->i_size
= i_size
;
941 /* Helper functions so that in most cases filesystems will
942 * not need to deal directly with kuid_t and kgid_t and can
943 * instead deal with the raw numeric values that are stored
946 static inline uid_t
i_uid_read(const struct inode
*inode
)
948 return from_kuid(&init_user_ns
, inode
->i_uid
);
951 static inline gid_t
i_gid_read(const struct inode
*inode
)
953 return from_kgid(&init_user_ns
, inode
->i_gid
);
956 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
958 inode
->i_uid
= make_kuid(&init_user_ns
, uid
);
961 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
963 inode
->i_gid
= make_kgid(&init_user_ns
, gid
);
966 static inline unsigned iminor(const struct inode
*inode
)
968 return MINOR(inode
->i_rdev
);
971 static inline unsigned imajor(const struct inode
*inode
)
973 return MAJOR(inode
->i_rdev
);
976 extern struct block_device
*I_BDEV(struct inode
*inode
);
979 rwlock_t lock
; /* protects pid, uid, euid fields */
980 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
981 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
982 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
983 int signum
; /* posix.1b rt signal to be delivered on IO */
987 * Track a single file's readahead state
989 struct file_ra_state
{
990 pgoff_t start
; /* where readahead started */
991 unsigned int size
; /* # of readahead pages */
992 unsigned int async_size
; /* do asynchronous readahead when
993 there are only # of pages ahead */
995 unsigned int ra_pages
; /* Maximum readahead window */
996 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
997 loff_t prev_pos
; /* Cache last read() position */
1001 * Check if @index falls in the readahead windows.
1003 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
1005 return (index
>= ra
->start
&&
1006 index
< ra
->start
+ ra
->size
);
1009 #define FILE_MNT_WRITE_TAKEN 1
1010 #define FILE_MNT_WRITE_RELEASED 2
1014 * fu_list becomes invalid after file_free is called and queued via
1015 * fu_rcuhead for RCU freeing
1018 struct list_head fu_list
;
1019 struct rcu_head fu_rcuhead
;
1022 #define f_dentry f_path.dentry
1023 #define f_vfsmnt f_path.mnt
1024 const struct file_operations
*f_op
;
1027 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
1028 * Must not be taken from IRQ context.
1034 atomic_long_t f_count
;
1035 unsigned int f_flags
;
1038 struct fown_struct f_owner
;
1039 const struct cred
*f_cred
;
1040 struct file_ra_state f_ra
;
1043 #ifdef CONFIG_SECURITY
1046 /* needed for tty driver, and maybe others */
1050 /* Used by fs/eventpoll.c to link all the hooks to this file */
1051 struct list_head f_ep_links
;
1052 struct list_head f_tfile_llink
;
1053 #endif /* #ifdef CONFIG_EPOLL */
1054 struct address_space
*f_mapping
;
1055 #ifdef CONFIG_DEBUG_WRITECOUNT
1056 unsigned long f_mnt_write_state
;
1060 struct file_handle
{
1063 /* file identifier */
1064 unsigned char f_handle
[0];
1067 #define get_file(x) atomic_long_inc(&(x)->f_count)
1068 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
1069 #define file_count(x) atomic_long_read(&(x)->f_count)
1071 #ifdef CONFIG_DEBUG_WRITECOUNT
1072 static inline void file_take_write(struct file
*f
)
1074 WARN_ON(f
->f_mnt_write_state
!= 0);
1075 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
1077 static inline void file_release_write(struct file
*f
)
1079 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
1081 static inline void file_reset_write(struct file
*f
)
1083 f
->f_mnt_write_state
= 0;
1085 static inline void file_check_state(struct file
*f
)
1088 * At this point, either both or neither of these bits
1091 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1092 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1094 static inline int file_check_writeable(struct file
*f
)
1096 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1098 printk(KERN_WARNING
"writeable file with no "
1099 "mnt_want_write()\n");
1103 #else /* !CONFIG_DEBUG_WRITECOUNT */
1104 static inline void file_take_write(struct file
*filp
) {}
1105 static inline void file_release_write(struct file
*filp
) {}
1106 static inline void file_reset_write(struct file
*filp
) {}
1107 static inline void file_check_state(struct file
*filp
) {}
1108 static inline int file_check_writeable(struct file
*filp
)
1112 #endif /* CONFIG_DEBUG_WRITECOUNT */
1114 #define MAX_NON_LFS ((1UL<<31) - 1)
1116 /* Page cache limit. The filesystems should put that into their s_maxbytes
1117 limits, otherwise bad things can happen in VM. */
1118 #if BITS_PER_LONG==32
1119 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1120 #elif BITS_PER_LONG==64
1121 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1126 #define FL_ACCESS 8 /* not trying to lock, just looking */
1127 #define FL_EXISTS 16 /* when unlocking, test for existence */
1128 #define FL_LEASE 32 /* lease held on this file */
1129 #define FL_CLOSE 64 /* unlock on close */
1130 #define FL_SLEEP 128 /* A blocking lock */
1131 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
1132 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
1135 * Special return value from posix_lock_file() and vfs_lock_file() for
1136 * asynchronous locking.
1138 #define FILE_LOCK_DEFERRED 1
1141 * The POSIX file lock owner is determined by
1142 * the "struct files_struct" in the thread group
1143 * (or NULL for no owner - BSD locks).
1145 * Lockd stuffs a "host" pointer into this.
1147 typedef struct files_struct
*fl_owner_t
;
1149 struct file_lock_operations
{
1150 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1151 void (*fl_release_private
)(struct file_lock
*);
1154 struct lock_manager_operations
{
1155 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
1156 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
1157 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
1158 void (*lm_release_private
)(struct file_lock
*);
1159 void (*lm_break
)(struct file_lock
*);
1160 int (*lm_change
)(struct file_lock
**, int);
1163 struct lock_manager
{
1164 struct list_head list
;
1167 void locks_start_grace(struct lock_manager
*);
1168 void locks_end_grace(struct lock_manager
*);
1169 int locks_in_grace(void);
1171 /* that will die - we need it for nfs_lock_info */
1172 #include <linux/nfs_fs_i.h>
1175 struct file_lock
*fl_next
; /* singly linked list for this inode */
1176 struct list_head fl_link
; /* doubly linked list of all locks */
1177 struct list_head fl_block
; /* circular list of blocked processes */
1178 fl_owner_t fl_owner
;
1179 unsigned int fl_flags
;
1180 unsigned char fl_type
;
1181 unsigned int fl_pid
;
1182 struct pid
*fl_nspid
;
1183 wait_queue_head_t fl_wait
;
1184 struct file
*fl_file
;
1188 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1189 /* for lease breaks: */
1190 unsigned long fl_break_time
;
1191 unsigned long fl_downgrade_time
;
1193 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1194 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1196 struct nfs_lock_info nfs_fl
;
1197 struct nfs4_lock_info nfs4_fl
;
1199 struct list_head link
; /* link in AFS vnode's pending_locks list */
1200 int state
; /* state of grant or error if -ve */
1205 /* The following constant reflects the upper bound of the file/locking space */
1207 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1208 #define OFFSET_MAX INT_LIMIT(loff_t)
1209 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1212 #include <linux/fcntl.h>
1214 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1216 #ifdef CONFIG_FILE_LOCKING
1217 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1218 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1219 struct flock __user
*);
1221 #if BITS_PER_LONG == 32
1222 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1223 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1224 struct flock64 __user
*);
1227 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1228 extern int fcntl_getlease(struct file
*filp
);
1231 void locks_free_lock(struct file_lock
*fl
);
1232 extern void locks_init_lock(struct file_lock
*);
1233 extern struct file_lock
* locks_alloc_lock(void);
1234 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1235 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1236 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1237 extern void locks_remove_flock(struct file
*);
1238 extern void locks_release_private(struct file_lock
*);
1239 extern void posix_test_lock(struct file
*, struct file_lock
*);
1240 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1241 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1242 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1243 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1244 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1245 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1246 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1247 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1248 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1249 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1250 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1251 extern int lease_modify(struct file_lock
**, int);
1252 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1253 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1254 extern void locks_delete_block(struct file_lock
*waiter
);
1255 extern void lock_flocks(void);
1256 extern void unlock_flocks(void);
1257 #else /* !CONFIG_FILE_LOCKING */
1258 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1263 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1264 unsigned int cmd
, struct flock __user
*user
)
1269 #if BITS_PER_LONG == 32
1270 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1275 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1276 unsigned int cmd
, struct flock64 __user
*user
)
1281 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1286 static inline int fcntl_getlease(struct file
*filp
)
1291 static inline void locks_init_lock(struct file_lock
*fl
)
1296 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1301 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1306 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1311 static inline void locks_remove_flock(struct file
*filp
)
1316 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1321 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1322 struct file_lock
*conflock
)
1327 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1332 static inline int posix_unblock_lock(struct file
*filp
,
1333 struct file_lock
*waiter
)
1338 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1343 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1344 struct file_lock
*fl
, struct file_lock
*conf
)
1349 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1354 static inline int flock_lock_file_wait(struct file
*filp
,
1355 struct file_lock
*request
)
1360 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1365 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1370 static inline int generic_setlease(struct file
*filp
, long arg
,
1371 struct file_lock
**flp
)
1376 static inline int vfs_setlease(struct file
*filp
, long arg
,
1377 struct file_lock
**lease
)
1382 static inline int lease_modify(struct file_lock
**before
, int arg
)
1387 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1393 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1399 static inline void locks_delete_block(struct file_lock
*waiter
)
1403 static inline void lock_flocks(void)
1407 static inline void unlock_flocks(void)
1411 #endif /* !CONFIG_FILE_LOCKING */
1414 struct fasync_struct
{
1418 struct fasync_struct
*fa_next
; /* singly linked list */
1419 struct file
*fa_file
;
1420 struct rcu_head fa_rcu
;
1423 #define FASYNC_MAGIC 0x4601
1425 /* SMP safe fasync helpers: */
1426 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1427 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1428 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1429 extern struct fasync_struct
*fasync_alloc(void);
1430 extern void fasync_free(struct fasync_struct
*);
1432 /* can be called from interrupts */
1433 extern void kill_fasync(struct fasync_struct
**, int, int);
1435 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1436 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1437 extern void f_delown(struct file
*filp
);
1438 extern pid_t
f_getown(struct file
*filp
);
1439 extern int send_sigurg(struct fown_struct
*fown
);
1445 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1446 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1447 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1448 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1449 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1451 extern struct list_head super_blocks
;
1452 extern spinlock_t sb_lock
;
1454 struct super_block
{
1455 struct list_head s_list
; /* Keep this first */
1456 dev_t s_dev
; /* search index; _not_ kdev_t */
1457 unsigned char s_dirt
;
1458 unsigned char s_blocksize_bits
;
1459 unsigned long s_blocksize
;
1460 loff_t s_maxbytes
; /* Max file size */
1461 struct file_system_type
*s_type
;
1462 const struct super_operations
*s_op
;
1463 const struct dquot_operations
*dq_op
;
1464 const struct quotactl_ops
*s_qcop
;
1465 const struct export_operations
*s_export_op
;
1466 unsigned long s_flags
;
1467 unsigned long s_magic
;
1468 struct dentry
*s_root
;
1469 struct rw_semaphore s_umount
;
1470 struct mutex s_lock
;
1473 #ifdef CONFIG_SECURITY
1476 const struct xattr_handler
**s_xattr
;
1478 struct list_head s_inodes
; /* all inodes */
1479 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1481 struct list_head __percpu
*s_files
;
1483 struct list_head s_files
;
1485 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1486 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1487 struct list_head s_dentry_lru
; /* unused dentry lru */
1488 int s_nr_dentry_unused
; /* # of dentry on lru */
1490 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1491 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp
;
1492 struct list_head s_inode_lru
; /* unused inode lru */
1493 int s_nr_inodes_unused
; /* # of inodes on lru */
1495 struct block_device
*s_bdev
;
1496 struct backing_dev_info
*s_bdi
;
1497 struct mtd_info
*s_mtd
;
1498 struct hlist_node s_instances
;
1499 struct quota_info s_dquot
; /* Diskquota specific options */
1502 wait_queue_head_t s_wait_unfrozen
;
1504 char s_id
[32]; /* Informational name */
1505 u8 s_uuid
[16]; /* UUID */
1507 void *s_fs_info
; /* Filesystem private info */
1508 unsigned int s_max_links
;
1511 /* Granularity of c/m/atime in ns.
1512 Cannot be worse than a second */
1516 * The next field is for VFS *only*. No filesystems have any business
1517 * even looking at it. You had been warned.
1519 struct mutex s_vfs_rename_mutex
; /* Kludge */
1522 * Filesystem subtype. If non-empty the filesystem type field
1523 * in /proc/mounts will be "type.subtype"
1528 * Saved mount options for lazy filesystems using
1529 * generic_show_options()
1531 char __rcu
*s_options
;
1532 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1535 * Saved pool identifier for cleancache (-1 means none)
1537 int cleancache_poolid
;
1539 struct shrinker s_shrink
; /* per-sb shrinker handle */
1541 /* Number of inodes with nlink == 0 but still referenced */
1542 atomic_long_t s_remove_count
;
1544 /* Being remounted read-only */
1545 int s_readonly_remount
;
1548 /* superblock cache pruning functions */
1549 extern void prune_icache_sb(struct super_block
*sb
, int nr_to_scan
);
1550 extern void prune_dcache_sb(struct super_block
*sb
, int nr_to_scan
);
1552 extern struct timespec
current_fs_time(struct super_block
*sb
);
1555 * Snapshotting support.
1559 SB_FREEZE_WRITE
= 1,
1560 SB_FREEZE_TRANS
= 2,
1563 #define vfs_check_frozen(sb, level) \
1564 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1566 extern bool inode_owner_or_capable(const struct inode
*inode
);
1568 /* not quite ready to be deprecated, but... */
1569 extern void lock_super(struct super_block
*);
1570 extern void unlock_super(struct super_block
*);
1573 * VFS helper functions..
1575 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, struct nameidata
*);
1576 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1577 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1578 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1579 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1580 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1581 extern int vfs_unlink(struct inode
*, struct dentry
*);
1582 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1585 * VFS dentry helper functions.
1587 extern void dentry_unhash(struct dentry
*dentry
);
1590 * VFS file helper functions.
1592 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1595 * VFS FS_IOC_FIEMAP helper definitions.
1597 struct fiemap_extent_info
{
1598 unsigned int fi_flags
; /* Flags as passed from user */
1599 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1600 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1601 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1602 fiemap_extent array */
1604 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1605 u64 phys
, u64 len
, u32 flags
);
1606 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1611 * NOTE! These match bits 12..15 of stat.st_mode
1612 * (ie "(i_mode >> 12) & 15").
1614 #define DT_UNKNOWN 0
1625 * This is the "filldir" function type, used by readdir() to let
1626 * the kernel specify what kind of dirent layout it wants to have.
1627 * This allows the kernel to read directories into kernel space or
1628 * to have different dirent layouts depending on the binary type.
1630 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1631 struct block_device_operations
;
1633 /* These macros are for out of kernel modules to test that
1634 * the kernel supports the unlocked_ioctl and compat_ioctl
1635 * fields in struct file_operations. */
1636 #define HAVE_COMPAT_IOCTL 1
1637 #define HAVE_UNLOCKED_IOCTL 1
1639 struct file_operations
{
1640 struct module
*owner
;
1641 loff_t (*llseek
) (struct file
*, loff_t
, int);
1642 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1643 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1644 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1645 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1646 int (*readdir
) (struct file
*, void *, filldir_t
);
1647 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1648 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1649 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1650 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1651 int (*open
) (struct inode
*, struct file
*);
1652 int (*flush
) (struct file
*, fl_owner_t id
);
1653 int (*release
) (struct inode
*, struct file
*);
1654 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1655 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1656 int (*fasync
) (int, struct file
*, int);
1657 int (*lock
) (struct file
*, int, struct file_lock
*);
1658 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1659 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1660 int (*check_flags
)(int);
1661 int (*flock
) (struct file
*, int, struct file_lock
*);
1662 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1663 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1664 int (*setlease
)(struct file
*, long, struct file_lock
**);
1665 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1669 struct inode_operations
{
1670 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1671 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1672 int (*permission
) (struct inode
*, int);
1673 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1675 int (*readlink
) (struct dentry
*, char __user
*,int);
1676 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1678 int (*create
) (struct inode
*,struct dentry
*,umode_t
,struct nameidata
*);
1679 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1680 int (*unlink
) (struct inode
*,struct dentry
*);
1681 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1682 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1683 int (*rmdir
) (struct inode
*,struct dentry
*);
1684 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1685 int (*rename
) (struct inode
*, struct dentry
*,
1686 struct inode
*, struct dentry
*);
1687 void (*truncate
) (struct inode
*);
1688 int (*setattr
) (struct dentry
*, struct iattr
*);
1689 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1690 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1691 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1692 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1693 int (*removexattr
) (struct dentry
*, const char *);
1694 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1696 int (*update_time
)(struct inode
*, struct timespec
*, int);
1697 struct file
* (*atomic_open
)(struct inode
*, struct dentry
*,
1698 struct opendata
*, unsigned open_flag
,
1699 umode_t create_mode
, int *opened
);
1700 } ____cacheline_aligned
;
1704 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1705 unsigned long nr_segs
, unsigned long fast_segs
,
1706 struct iovec
*fast_pointer
,
1707 struct iovec
**ret_pointer
);
1709 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1710 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1711 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1712 unsigned long, loff_t
*);
1713 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1714 unsigned long, loff_t
*);
1716 struct super_operations
{
1717 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1718 void (*destroy_inode
)(struct inode
*);
1720 void (*dirty_inode
) (struct inode
*, int flags
);
1721 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1722 int (*drop_inode
) (struct inode
*);
1723 void (*evict_inode
) (struct inode
*);
1724 void (*put_super
) (struct super_block
*);
1725 void (*write_super
) (struct super_block
*);
1726 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1727 int (*freeze_fs
) (struct super_block
*);
1728 int (*unfreeze_fs
) (struct super_block
*);
1729 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1730 int (*remount_fs
) (struct super_block
*, int *, char *);
1731 void (*umount_begin
) (struct super_block
*);
1733 int (*show_options
)(struct seq_file
*, struct dentry
*);
1734 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1735 int (*show_path
)(struct seq_file
*, struct dentry
*);
1736 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1738 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1739 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1741 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1742 int (*nr_cached_objects
)(struct super_block
*);
1743 void (*free_cached_objects
)(struct super_block
*, int);
1747 * Inode state bits. Protected by inode->i_lock
1749 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1750 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1752 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1753 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1754 * various stages of removing an inode.
1756 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1758 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1759 * fdatasync(). i_atime is the usual cause.
1760 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1761 * these changes separately from I_DIRTY_SYNC so that we
1762 * don't have to write inode on fdatasync() when only
1763 * mtime has changed in it.
1764 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1765 * I_NEW Serves as both a mutex and completion notification.
1766 * New inodes set I_NEW. If two processes both create
1767 * the same inode, one of them will release its inode and
1768 * wait for I_NEW to be released before returning.
1769 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1770 * also cause waiting on I_NEW, without I_NEW actually
1771 * being set. find_inode() uses this to prevent returning
1772 * nearly-dead inodes.
1773 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1774 * is zero. I_FREEING must be set when I_WILL_FREE is
1776 * I_FREEING Set when inode is about to be freed but still has dirty
1777 * pages or buffers attached or the inode itself is still
1779 * I_CLEAR Added by clear_inode(). In this state the inode is
1780 * clean and can be destroyed. Inode keeps I_FREEING.
1782 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1783 * prohibited for many purposes. iget() must wait for
1784 * the inode to be completely released, then create it
1785 * anew. Other functions will just ignore such inodes,
1786 * if appropriate. I_NEW is used for waiting.
1788 * I_SYNC Writeback of inode is running. The bit is set during
1789 * data writeback, and cleared with a wakeup on the bit
1790 * address once it is done. The bit is also used to pin
1791 * the inode in memory for flusher thread.
1793 * I_REFERENCED Marks the inode as recently references on the LRU list.
1795 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1797 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1799 #define I_DIRTY_SYNC (1 << 0)
1800 #define I_DIRTY_DATASYNC (1 << 1)
1801 #define I_DIRTY_PAGES (1 << 2)
1803 #define I_NEW (1 << __I_NEW)
1804 #define I_WILL_FREE (1 << 4)
1805 #define I_FREEING (1 << 5)
1806 #define I_CLEAR (1 << 6)
1808 #define I_SYNC (1 << __I_SYNC)
1809 #define I_REFERENCED (1 << 8)
1810 #define __I_DIO_WAKEUP 9
1811 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1813 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1815 extern void __mark_inode_dirty(struct inode
*, int);
1816 static inline void mark_inode_dirty(struct inode
*inode
)
1818 __mark_inode_dirty(inode
, I_DIRTY
);
1821 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1823 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1826 extern void inc_nlink(struct inode
*inode
);
1827 extern void drop_nlink(struct inode
*inode
);
1828 extern void clear_nlink(struct inode
*inode
);
1829 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1831 static inline void inode_inc_link_count(struct inode
*inode
)
1834 mark_inode_dirty(inode
);
1837 static inline void inode_dec_link_count(struct inode
*inode
)
1840 mark_inode_dirty(inode
);
1844 * inode_inc_iversion - increments i_version
1845 * @inode: inode that need to be updated
1847 * Every time the inode is modified, the i_version field will be incremented.
1848 * The filesystem has to be mounted with i_version flag
1851 static inline void inode_inc_iversion(struct inode
*inode
)
1853 spin_lock(&inode
->i_lock
);
1855 spin_unlock(&inode
->i_lock
);
1858 enum file_time_flags
{
1865 extern void touch_atime(struct path
*);
1866 static inline void file_accessed(struct file
*file
)
1868 if (!(file
->f_flags
& O_NOATIME
))
1869 touch_atime(&file
->f_path
);
1872 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1873 int sync_inode_metadata(struct inode
*inode
, int wait
);
1875 struct file_system_type
{
1878 struct dentry
*(*mount
) (struct file_system_type
*, int,
1879 const char *, void *);
1880 void (*kill_sb
) (struct super_block
*);
1881 struct module
*owner
;
1882 struct file_system_type
* next
;
1883 struct hlist_head fs_supers
;
1885 struct lock_class_key s_lock_key
;
1886 struct lock_class_key s_umount_key
;
1887 struct lock_class_key s_vfs_rename_key
;
1889 struct lock_class_key i_lock_key
;
1890 struct lock_class_key i_mutex_key
;
1891 struct lock_class_key i_mutex_dir_key
;
1894 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1895 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1896 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1897 int flags
, const char *dev_name
, void *data
,
1898 int (*fill_super
)(struct super_block
*, void *, int));
1899 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1900 int flags
, void *data
,
1901 int (*fill_super
)(struct super_block
*, void *, int));
1902 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1903 int flags
, void *data
,
1904 int (*fill_super
)(struct super_block
*, void *, int));
1905 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1906 void generic_shutdown_super(struct super_block
*sb
);
1907 void kill_block_super(struct super_block
*sb
);
1908 void kill_anon_super(struct super_block
*sb
);
1909 void kill_litter_super(struct super_block
*sb
);
1910 void deactivate_super(struct super_block
*sb
);
1911 void deactivate_locked_super(struct super_block
*sb
);
1912 int set_anon_super(struct super_block
*s
, void *data
);
1913 int get_anon_bdev(dev_t
*);
1914 void free_anon_bdev(dev_t
);
1915 struct super_block
*sget(struct file_system_type
*type
,
1916 int (*test
)(struct super_block
*,void *),
1917 int (*set
)(struct super_block
*,void *),
1919 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1920 const struct super_operations
*ops
,
1921 const struct dentry_operations
*dops
,
1924 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1925 #define fops_get(fops) \
1926 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1927 #define fops_put(fops) \
1928 do { if (fops) module_put((fops)->owner); } while(0)
1930 extern int register_filesystem(struct file_system_type
*);
1931 extern int unregister_filesystem(struct file_system_type
*);
1932 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1933 #define kern_mount(type) kern_mount_data(type, NULL)
1934 extern void kern_unmount(struct vfsmount
*mnt
);
1935 extern int may_umount_tree(struct vfsmount
*);
1936 extern int may_umount(struct vfsmount
*);
1937 extern long do_mount(char *, char *, char *, unsigned long, void *);
1938 extern struct vfsmount
*collect_mounts(struct path
*);
1939 extern void drop_collected_mounts(struct vfsmount
*);
1940 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1942 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1943 extern int user_statfs(const char __user
*, struct kstatfs
*);
1944 extern int fd_statfs(int, struct kstatfs
*);
1945 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1946 extern int freeze_super(struct super_block
*super
);
1947 extern int thaw_super(struct super_block
*super
);
1948 extern bool our_mnt(struct vfsmount
*mnt
);
1950 extern int current_umask(void);
1953 extern struct kobject
*fs_kobj
;
1955 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1956 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1958 #define FLOCK_VERIFY_READ 1
1959 #define FLOCK_VERIFY_WRITE 2
1961 #ifdef CONFIG_FILE_LOCKING
1962 extern int locks_mandatory_locked(struct inode
*);
1963 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1966 * Candidates for mandatory locking have the setgid bit set
1967 * but no group execute bit - an otherwise meaningless combination.
1970 static inline int __mandatory_lock(struct inode
*ino
)
1972 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1976 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1977 * otherwise these will be advisory locks
1980 static inline int mandatory_lock(struct inode
*ino
)
1982 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1985 static inline int locks_verify_locked(struct inode
*inode
)
1987 if (mandatory_lock(inode
))
1988 return locks_mandatory_locked(inode
);
1992 static inline int locks_verify_truncate(struct inode
*inode
,
1996 if (inode
->i_flock
&& mandatory_lock(inode
))
1997 return locks_mandatory_area(
1998 FLOCK_VERIFY_WRITE
, inode
, filp
,
1999 size
< inode
->i_size
? size
: inode
->i_size
,
2000 (size
< inode
->i_size
? inode
->i_size
- size
2001 : size
- inode
->i_size
)
2006 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2009 return __break_lease(inode
, mode
);
2012 #else /* !CONFIG_FILE_LOCKING */
2013 static inline int locks_mandatory_locked(struct inode
*inode
)
2018 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
2019 struct file
*filp
, loff_t offset
,
2025 static inline int __mandatory_lock(struct inode
*inode
)
2030 static inline int mandatory_lock(struct inode
*inode
)
2035 static inline int locks_verify_locked(struct inode
*inode
)
2040 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2046 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2051 #endif /* CONFIG_FILE_LOCKING */
2055 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2057 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2059 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2061 extern struct file
*filp_open(const char *, int, umode_t
);
2062 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2064 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
2065 const struct cred
*);
2066 extern int filp_close(struct file
*, fl_owner_t id
);
2067 extern char * getname(const char __user
*);
2072 extern struct file
*finish_open(struct opendata
*od
, struct dentry
*dentry
,
2073 int (*open
)(struct inode
*, struct file
*),
2075 extern void finish_no_open(struct opendata
*od
, struct dentry
*dentry
);
2079 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2082 extern void __init
vfs_caches_init_early(void);
2083 extern void __init
vfs_caches_init(unsigned long);
2085 extern struct kmem_cache
*names_cachep
;
2087 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2088 #define __getname() __getname_gfp(GFP_KERNEL)
2089 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2090 #ifndef CONFIG_AUDITSYSCALL
2091 #define putname(name) __putname(name)
2093 extern void putname(const char *name
);
2097 extern int register_blkdev(unsigned int, const char *);
2098 extern void unregister_blkdev(unsigned int, const char *);
2099 extern struct block_device
*bdget(dev_t
);
2100 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2101 extern void bd_set_size(struct block_device
*, loff_t size
);
2102 extern sector_t
blkdev_max_block(struct block_device
*bdev
);
2103 extern void bd_forget(struct inode
*inode
);
2104 extern void bdput(struct block_device
*);
2105 extern void invalidate_bdev(struct block_device
*);
2106 extern int sync_blockdev(struct block_device
*bdev
);
2107 extern void kill_bdev(struct block_device
*);
2108 extern struct super_block
*freeze_bdev(struct block_device
*);
2109 extern void emergency_thaw_all(void);
2110 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2111 extern int fsync_bdev(struct block_device
*);
2113 static inline void bd_forget(struct inode
*inode
) {}
2114 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2115 static inline void kill_bdev(struct block_device
*bdev
) {}
2116 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2118 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2123 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2128 extern int sync_filesystem(struct super_block
*);
2129 extern const struct file_operations def_blk_fops
;
2130 extern const struct file_operations def_chr_fops
;
2131 extern const struct file_operations bad_sock_fops
;
2132 extern const struct file_operations def_fifo_fops
;
2134 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2135 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2136 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2137 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2138 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2140 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2142 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2144 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2145 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2146 struct gendisk
*disk
);
2148 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2149 struct gendisk
*disk
)
2153 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2154 struct gendisk
*disk
)
2161 #define CHRDEV_MAJOR_HASH_SIZE 255
2162 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2163 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2164 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2165 unsigned int count
, const char *name
,
2166 const struct file_operations
*fops
);
2167 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2168 unsigned int count
, const char *name
);
2169 extern void unregister_chrdev_region(dev_t
, unsigned);
2170 extern void chrdev_show(struct seq_file
*,off_t
);
2172 static inline int register_chrdev(unsigned int major
, const char *name
,
2173 const struct file_operations
*fops
)
2175 return __register_chrdev(major
, 0, 256, name
, fops
);
2178 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2180 __unregister_chrdev(major
, 0, 256, name
);
2183 /* fs/block_dev.c */
2184 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2185 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2188 #define BLKDEV_MAJOR_HASH_SIZE 255
2189 extern const char *__bdevname(dev_t
, char *buffer
);
2190 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2191 extern struct block_device
*lookup_bdev(const char *);
2192 extern void blkdev_show(struct seq_file
*,off_t
);
2195 #define BLKDEV_MAJOR_HASH_SIZE 0
2198 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2200 /* Invalid inode operations -- fs/bad_inode.c */
2201 extern void make_bad_inode(struct inode
*);
2202 extern int is_bad_inode(struct inode
*);
2204 extern const struct file_operations read_pipefifo_fops
;
2205 extern const struct file_operations write_pipefifo_fops
;
2206 extern const struct file_operations rdwr_pipefifo_fops
;
2210 * return READ, READA, or WRITE
2212 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2215 * return data direction, READ or WRITE
2217 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2219 extern void check_disk_size_change(struct gendisk
*disk
,
2220 struct block_device
*bdev
);
2221 extern int revalidate_disk(struct gendisk
*);
2222 extern int check_disk_change(struct block_device
*);
2223 extern int __invalidate_device(struct block_device
*, bool);
2224 extern int invalidate_partition(struct gendisk
*, int);
2226 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2227 pgoff_t start
, pgoff_t end
);
2229 static inline void invalidate_remote_inode(struct inode
*inode
)
2231 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2232 S_ISLNK(inode
->i_mode
))
2233 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2235 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2236 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2237 pgoff_t start
, pgoff_t end
);
2238 extern int write_inode_now(struct inode
*, int);
2239 extern int filemap_fdatawrite(struct address_space
*);
2240 extern int filemap_flush(struct address_space
*);
2241 extern int filemap_fdatawait(struct address_space
*);
2242 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2244 extern int filemap_write_and_wait(struct address_space
*mapping
);
2245 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2246 loff_t lstart
, loff_t lend
);
2247 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2248 loff_t start
, loff_t end
, int sync_mode
);
2249 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2250 loff_t start
, loff_t end
);
2252 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2254 extern int vfs_fsync(struct file
*file
, int datasync
);
2255 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2256 extern void sync_supers(void);
2257 extern void emergency_sync(void);
2258 extern void emergency_remount(void);
2260 extern sector_t
bmap(struct inode
*, sector_t
);
2262 extern int notify_change(struct dentry
*, struct iattr
*);
2263 extern int inode_permission(struct inode
*, int);
2264 extern int generic_permission(struct inode
*, int);
2266 static inline bool execute_ok(struct inode
*inode
)
2268 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2272 * get_write_access() gets write permission for a file.
2273 * put_write_access() releases this write permission.
2274 * This is used for regular files.
2275 * We cannot support write (and maybe mmap read-write shared) accesses and
2276 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2277 * can have the following values:
2278 * 0: no writers, no VM_DENYWRITE mappings
2279 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2280 * > 0: (i_writecount) users are writing to the file.
2282 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2283 * except for the cases where we don't hold i_writecount yet. Then we need to
2284 * use {get,deny}_write_access() - these functions check the sign and refuse
2285 * to do the change if sign is wrong.
2287 static inline int get_write_access(struct inode
*inode
)
2289 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2291 static inline int deny_write_access(struct file
*file
)
2293 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2294 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2296 static inline void put_write_access(struct inode
* inode
)
2298 atomic_dec(&inode
->i_writecount
);
2300 static inline void allow_write_access(struct file
*file
)
2303 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2306 static inline void i_readcount_dec(struct inode
*inode
)
2308 BUG_ON(!atomic_read(&inode
->i_readcount
));
2309 atomic_dec(&inode
->i_readcount
);
2311 static inline void i_readcount_inc(struct inode
*inode
)
2313 atomic_inc(&inode
->i_readcount
);
2316 static inline void i_readcount_dec(struct inode
*inode
)
2320 static inline void i_readcount_inc(struct inode
*inode
)
2325 extern int do_pipe_flags(int *, int);
2326 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2327 extern struct file
*create_write_pipe(int flags
);
2328 extern void free_write_pipe(struct file
*);
2330 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2331 extern struct file
* open_exec(const char *);
2333 /* fs/dcache.c -- generic fs support functions */
2334 extern int is_subdir(struct dentry
*, struct dentry
*);
2335 extern int path_is_under(struct path
*, struct path
*);
2336 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2338 #include <linux/err.h>
2340 /* needed for stackable file system support */
2341 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2343 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2345 extern int inode_init_always(struct super_block
*, struct inode
*);
2346 extern void inode_init_once(struct inode
*);
2347 extern void address_space_init_once(struct address_space
*mapping
);
2348 extern void ihold(struct inode
* inode
);
2349 extern void iput(struct inode
*);
2350 extern struct inode
* igrab(struct inode
*);
2351 extern ino_t
iunique(struct super_block
*, ino_t
);
2352 extern int inode_needs_sync(struct inode
*inode
);
2353 extern int generic_delete_inode(struct inode
*inode
);
2354 static inline int generic_drop_inode(struct inode
*inode
)
2356 return !inode
->i_nlink
|| inode_unhashed(inode
);
2359 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2360 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2362 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2363 int (*test
)(struct inode
*, void *), void *data
);
2364 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2366 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2367 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2368 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2369 extern int insert_inode_locked(struct inode
*);
2370 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2371 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2373 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2375 extern void unlock_new_inode(struct inode
*);
2376 extern unsigned int get_next_ino(void);
2378 extern void __iget(struct inode
* inode
);
2379 extern void iget_failed(struct inode
*);
2380 extern void clear_inode(struct inode
*);
2381 extern void __destroy_inode(struct inode
*);
2382 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2383 extern struct inode
*new_inode(struct super_block
*sb
);
2384 extern void free_inode_nonrcu(struct inode
*inode
);
2385 extern int should_remove_suid(struct dentry
*);
2386 extern int file_remove_suid(struct file
*);
2388 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2389 static inline void insert_inode_hash(struct inode
*inode
)
2391 __insert_inode_hash(inode
, inode
->i_ino
);
2394 extern void __remove_inode_hash(struct inode
*);
2395 static inline void remove_inode_hash(struct inode
*inode
)
2397 if (!inode_unhashed(inode
))
2398 __remove_inode_hash(inode
);
2401 extern void inode_sb_list_add(struct inode
*inode
);
2404 extern void submit_bio(int, struct bio
*);
2405 extern int bdev_read_only(struct block_device
*);
2407 extern int set_blocksize(struct block_device
*, int);
2408 extern int sb_set_blocksize(struct super_block
*, int);
2409 extern int sb_min_blocksize(struct super_block
*, int);
2411 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2412 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2413 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2414 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2415 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2416 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2418 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2419 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2420 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2421 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2422 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2423 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2424 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2425 extern int generic_segment_checks(const struct iovec
*iov
,
2426 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2428 /* fs/block_dev.c */
2429 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2430 unsigned long nr_segs
, loff_t pos
);
2431 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2433 extern void block_sync_page(struct page
*page
);
2436 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2437 struct pipe_inode_info
*, size_t, unsigned int);
2438 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2439 struct pipe_inode_info
*, size_t, unsigned int);
2440 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2441 struct file
*, loff_t
*, size_t, unsigned int);
2442 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2443 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2444 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2445 size_t len
, unsigned int flags
);
2448 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2449 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2450 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2451 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2452 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2453 int origin
, loff_t maxsize
);
2454 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2455 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2457 #ifdef CONFIG_FS_XIP
2458 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2460 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2461 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2462 size_t len
, loff_t
*ppos
);
2463 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2465 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2472 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2473 loff_t file_offset
);
2476 /* need locking between buffered and direct access */
2479 /* filesystem does not support filling holes */
2480 DIO_SKIP_HOLES
= 0x02,
2483 void dio_end_io(struct bio
*bio
, int error
);
2485 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2486 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2487 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2488 dio_submit_t submit_io
, int flags
);
2490 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2491 struct inode
*inode
, const struct iovec
*iov
, loff_t offset
,
2492 unsigned long nr_segs
, get_block_t get_block
)
2494 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2495 offset
, nr_segs
, get_block
, NULL
, NULL
,
2496 DIO_LOCKING
| DIO_SKIP_HOLES
);
2500 void inode_dio_wait(struct inode
*inode
);
2501 void inode_dio_done(struct inode
*inode
);
2503 extern const struct file_operations generic_ro_fops
;
2505 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2507 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2508 extern int vfs_follow_link(struct nameidata
*, const char *);
2509 extern int page_readlink(struct dentry
*, char __user
*, int);
2510 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2511 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2512 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2514 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2515 extern const struct inode_operations page_symlink_inode_operations
;
2516 extern int generic_readlink(struct dentry
*, char __user
*, int);
2517 extern void generic_fillattr(struct inode
*, struct kstat
*);
2518 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2519 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2520 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2521 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2522 loff_t
inode_get_bytes(struct inode
*inode
);
2523 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2525 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2527 extern int vfs_stat(const char __user
*, struct kstat
*);
2528 extern int vfs_lstat(const char __user
*, struct kstat
*);
2529 extern int vfs_fstat(unsigned int, struct kstat
*);
2530 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2532 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2534 extern int __generic_block_fiemap(struct inode
*inode
,
2535 struct fiemap_extent_info
*fieinfo
,
2536 loff_t start
, loff_t len
,
2537 get_block_t
*get_block
);
2538 extern int generic_block_fiemap(struct inode
*inode
,
2539 struct fiemap_extent_info
*fieinfo
, u64 start
,
2540 u64 len
, get_block_t
*get_block
);
2542 extern void get_filesystem(struct file_system_type
*fs
);
2543 extern void put_filesystem(struct file_system_type
*fs
);
2544 extern struct file_system_type
*get_fs_type(const char *name
);
2545 extern struct super_block
*get_super(struct block_device
*);
2546 extern struct super_block
*get_super_thawed(struct block_device
*);
2547 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2548 extern void drop_super(struct super_block
*sb
);
2549 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2550 extern void iterate_supers_type(struct file_system_type
*,
2551 void (*)(struct super_block
*, void *), void *);
2553 extern int dcache_dir_open(struct inode
*, struct file
*);
2554 extern int dcache_dir_close(struct inode
*, struct file
*);
2555 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2556 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2557 extern int simple_setattr(struct dentry
*, struct iattr
*);
2558 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2559 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2560 extern int simple_open(struct inode
*inode
, struct file
*file
);
2561 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2562 extern int simple_unlink(struct inode
*, struct dentry
*);
2563 extern int simple_rmdir(struct inode
*, struct dentry
*);
2564 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2565 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2566 extern int simple_empty(struct dentry
*);
2567 extern int simple_readpage(struct file
*file
, struct page
*page
);
2568 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2569 loff_t pos
, unsigned len
, unsigned flags
,
2570 struct page
**pagep
, void **fsdata
);
2571 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2572 loff_t pos
, unsigned len
, unsigned copied
,
2573 struct page
*page
, void *fsdata
);
2575 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2576 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2577 extern const struct file_operations simple_dir_operations
;
2578 extern const struct inode_operations simple_dir_inode_operations
;
2579 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2580 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2581 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2582 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2583 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2585 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2586 loff_t
*ppos
, const void *from
, size_t available
);
2587 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2588 const void __user
*from
, size_t count
);
2590 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2592 extern int generic_check_addressable(unsigned, u64
);
2594 #ifdef CONFIG_MIGRATION
2595 extern int buffer_migrate_page(struct address_space
*,
2596 struct page
*, struct page
*,
2599 #define buffer_migrate_page NULL
2602 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2603 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2604 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2606 extern int file_update_time(struct file
*file
);
2608 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2609 extern void save_mount_options(struct super_block
*sb
, char *options
);
2610 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2612 static inline ino_t
parent_ino(struct dentry
*dentry
)
2617 * Don't strictly need d_lock here? If the parent ino could change
2618 * then surely we'd have a deeper race in the caller?
2620 spin_lock(&dentry
->d_lock
);
2621 res
= dentry
->d_parent
->d_inode
->i_ino
;
2622 spin_unlock(&dentry
->d_lock
);
2626 /* Transaction based IO helpers */
2629 * An argresp is stored in an allocated page and holds the
2630 * size of the argument or response, along with its content
2632 struct simple_transaction_argresp
{
2637 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2639 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2641 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2642 size_t size
, loff_t
*pos
);
2643 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2645 void simple_transaction_set(struct file
*file
, size_t n
);
2648 * simple attribute files
2650 * These attributes behave similar to those in sysfs:
2652 * Writing to an attribute immediately sets a value, an open file can be
2653 * written to multiple times.
2655 * Reading from an attribute creates a buffer from the value that might get
2656 * read with multiple read calls. When the attribute has been read
2657 * completely, no further read calls are possible until the file is opened
2660 * All attributes contain a text representation of a numeric value
2661 * that are accessed with the get() and set() functions.
2663 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2664 static int __fops ## _open(struct inode *inode, struct file *file) \
2666 __simple_attr_check_format(__fmt, 0ull); \
2667 return simple_attr_open(inode, file, __get, __set, __fmt); \
2669 static const struct file_operations __fops = { \
2670 .owner = THIS_MODULE, \
2671 .open = __fops ## _open, \
2672 .release = simple_attr_release, \
2673 .read = simple_attr_read, \
2674 .write = simple_attr_write, \
2675 .llseek = generic_file_llseek, \
2678 static inline __printf(1, 2)
2679 void __simple_attr_check_format(const char *fmt
, ...)
2681 /* don't do anything, just let the compiler check the arguments; */
2684 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2685 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2687 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2688 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2689 size_t len
, loff_t
*ppos
);
2690 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2691 size_t len
, loff_t
*ppos
);
2694 int proc_nr_files(struct ctl_table
*table
, int write
,
2695 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2696 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2697 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2698 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2699 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2700 int __init
get_filesystem_list(char *buf
);
2702 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2703 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2705 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2706 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2707 (flag & __FMODE_NONOTIFY)))
2709 static inline int is_sxid(umode_t mode
)
2711 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2714 static inline void inode_has_no_xattr(struct inode
*inode
)
2716 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2717 inode
->i_flags
|= S_NOSEC
;
2720 #endif /* __KERNEL__ */
2721 #endif /* _LINUX_FS_H */