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
;
431 extern void __init
inode_init(void);
432 extern void __init
inode_init_early(void);
433 extern void __init
files_init(unsigned long);
435 extern struct files_stat_struct files_stat
;
436 extern unsigned long get_max_files(void);
437 extern int sysctl_nr_open
;
438 extern struct inodes_stat_t inodes_stat
;
439 extern int leases_enable
, lease_break_time
;
442 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
443 struct buffer_head
*bh_result
, int create
);
444 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
445 ssize_t bytes
, void *private, int ret
,
449 * Attribute flags. These should be or-ed together to figure out what
452 #define ATTR_MODE (1 << 0)
453 #define ATTR_UID (1 << 1)
454 #define ATTR_GID (1 << 2)
455 #define ATTR_SIZE (1 << 3)
456 #define ATTR_ATIME (1 << 4)
457 #define ATTR_MTIME (1 << 5)
458 #define ATTR_CTIME (1 << 6)
459 #define ATTR_ATIME_SET (1 << 7)
460 #define ATTR_MTIME_SET (1 << 8)
461 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
462 #define ATTR_ATTR_FLAG (1 << 10)
463 #define ATTR_KILL_SUID (1 << 11)
464 #define ATTR_KILL_SGID (1 << 12)
465 #define ATTR_FILE (1 << 13)
466 #define ATTR_KILL_PRIV (1 << 14)
467 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
468 #define ATTR_TIMES_SET (1 << 16)
471 * This is the Inode Attributes structure, used for notify_change(). It
472 * uses the above definitions as flags, to know which values have changed.
473 * Also, in this manner, a Filesystem can look at only the values it cares
474 * about. Basically, these are the attributes that the VFS layer can
475 * request to change from the FS layer.
477 * Derek Atkins <warlord@MIT.EDU> 94-10-20
480 unsigned int ia_valid
;
485 struct timespec ia_atime
;
486 struct timespec ia_mtime
;
487 struct timespec ia_ctime
;
490 * Not an attribute, but an auxiliary info for filesystems wanting to
491 * implement an ftruncate() like method. NOTE: filesystem should
492 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
494 struct file
*ia_file
;
498 * Includes for diskquotas.
500 #include <linux/quota.h>
503 * enum positive_aop_returns - aop return codes with specific semantics
505 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
506 * completed, that the page is still locked, and
507 * should be considered active. The VM uses this hint
508 * to return the page to the active list -- it won't
509 * be a candidate for writeback again in the near
510 * future. Other callers must be careful to unlock
511 * the page if they get this return. Returned by
514 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
515 * unlocked it and the page might have been truncated.
516 * The caller should back up to acquiring a new page and
517 * trying again. The aop will be taking reasonable
518 * precautions not to livelock. If the caller held a page
519 * reference, it should drop it before retrying. Returned
522 * address_space_operation functions return these large constants to indicate
523 * special semantics to the caller. These are much larger than the bytes in a
524 * page to allow for functions that return the number of bytes operated on in a
528 enum positive_aop_returns
{
529 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
530 AOP_TRUNCATED_PAGE
= 0x80001,
533 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
534 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
535 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
536 * helper code (eg buffer layer)
537 * to clear GFP_FS from alloc */
540 * oh the beauties of C type declarations.
543 struct address_space
;
544 struct writeback_control
;
547 const struct iovec
*iov
;
548 unsigned long nr_segs
;
553 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
554 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
555 size_t iov_iter_copy_from_user(struct page
*page
,
556 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
557 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
558 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
559 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
561 static inline void iov_iter_init(struct iov_iter
*i
,
562 const struct iovec
*iov
, unsigned long nr_segs
,
563 size_t count
, size_t written
)
566 i
->nr_segs
= nr_segs
;
568 i
->count
= count
+ written
;
570 iov_iter_advance(i
, written
);
573 static inline size_t iov_iter_count(struct iov_iter
*i
)
579 * "descriptor" for what we're up to with a read.
580 * This allows us to use the same read code yet
581 * have multiple different users of the data that
582 * we read from a file.
584 * The simplest case just copies the data to user
597 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
598 unsigned long, unsigned long);
600 struct address_space_operations
{
601 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
602 int (*readpage
)(struct file
*, struct page
*);
604 /* Write back some dirty pages from this mapping. */
605 int (*writepages
)(struct address_space
*, struct writeback_control
*);
607 /* Set a page dirty. Return true if this dirtied it */
608 int (*set_page_dirty
)(struct page
*page
);
610 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
611 struct list_head
*pages
, unsigned nr_pages
);
613 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
614 loff_t pos
, unsigned len
, unsigned flags
,
615 struct page
**pagep
, void **fsdata
);
616 int (*write_end
)(struct file
*, struct address_space
*mapping
,
617 loff_t pos
, unsigned len
, unsigned copied
,
618 struct page
*page
, void *fsdata
);
620 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
621 sector_t (*bmap
)(struct address_space
*, sector_t
);
622 void (*invalidatepage
) (struct page
*, unsigned long);
623 int (*releasepage
) (struct page
*, gfp_t
);
624 void (*freepage
)(struct page
*);
625 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
626 loff_t offset
, unsigned long nr_segs
);
627 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
628 void **, unsigned long *);
630 * migrate the contents of a page to the specified target. If sync
631 * is false, it must not block.
633 int (*migratepage
) (struct address_space
*,
634 struct page
*, struct page
*, enum migrate_mode
);
635 int (*launder_page
) (struct page
*);
636 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
638 int (*error_remove_page
)(struct address_space
*, struct page
*);
641 extern const struct address_space_operations empty_aops
;
644 * pagecache_write_begin/pagecache_write_end must be used by general code
645 * to write into the pagecache.
647 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
648 loff_t pos
, unsigned len
, unsigned flags
,
649 struct page
**pagep
, void **fsdata
);
651 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
652 loff_t pos
, unsigned len
, unsigned copied
,
653 struct page
*page
, void *fsdata
);
655 struct backing_dev_info
;
656 struct address_space
{
657 struct inode
*host
; /* owner: inode, block_device */
658 struct radix_tree_root page_tree
; /* radix tree of all pages */
659 spinlock_t tree_lock
; /* and lock protecting it */
660 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
661 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
662 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
663 struct mutex i_mmap_mutex
; /* protect tree, count, list */
664 /* Protected by tree_lock together with the radix tree */
665 unsigned long nrpages
; /* number of total pages */
666 pgoff_t writeback_index
;/* writeback starts here */
667 const struct address_space_operations
*a_ops
; /* methods */
668 unsigned long flags
; /* error bits/gfp mask */
669 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
670 spinlock_t private_lock
; /* for use by the address_space */
671 struct list_head private_list
; /* ditto */
672 struct address_space
*assoc_mapping
; /* ditto */
673 } __attribute__((aligned(sizeof(long))));
675 * On most architectures that alignment is already the case; but
676 * must be enforced here for CRIS, to let the least significant bit
677 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
679 struct request_queue
;
681 struct block_device
{
682 dev_t bd_dev
; /* not a kdev_t - it's a search key */
684 struct inode
* bd_inode
; /* will die */
685 struct super_block
* bd_super
;
686 struct mutex bd_mutex
; /* open/close mutex */
687 struct list_head bd_inodes
;
691 bool bd_write_holder
;
693 struct list_head bd_holder_disks
;
695 struct block_device
* bd_contains
;
696 unsigned bd_block_size
;
697 struct hd_struct
* bd_part
;
698 /* number of times partitions within this device have been opened. */
699 unsigned bd_part_count
;
701 struct gendisk
* bd_disk
;
702 struct request_queue
* bd_queue
;
703 struct list_head bd_list
;
705 * Private data. You must have bd_claim'ed the block_device
706 * to use this. NOTE: bd_claim allows an owner to claim
707 * the same device multiple times, the owner must take special
708 * care to not mess up bd_private for that case.
710 unsigned long bd_private
;
712 /* The counter of freeze processes */
713 int bd_fsfreeze_count
;
714 /* Mutex for freeze */
715 struct mutex bd_fsfreeze_mutex
;
719 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
722 #define PAGECACHE_TAG_DIRTY 0
723 #define PAGECACHE_TAG_WRITEBACK 1
724 #define PAGECACHE_TAG_TOWRITE 2
726 int mapping_tagged(struct address_space
*mapping
, int tag
);
729 * Might pages of this file be mapped into userspace?
731 static inline int mapping_mapped(struct address_space
*mapping
)
733 return !prio_tree_empty(&mapping
->i_mmap
) ||
734 !list_empty(&mapping
->i_mmap_nonlinear
);
738 * Might pages of this file have been modified in userspace?
739 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
740 * marks vma as VM_SHARED if it is shared, and the file was opened for
741 * writing i.e. vma may be mprotected writable even if now readonly.
743 static inline int mapping_writably_mapped(struct address_space
*mapping
)
745 return mapping
->i_mmap_writable
!= 0;
749 * Use sequence counter to get consistent i_size on 32-bit processors.
751 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
752 #include <linux/seqlock.h>
753 #define __NEED_I_SIZE_ORDERED
754 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
756 #define i_size_ordered_init(inode) do { } while (0)
760 #define ACL_NOT_CACHED ((void *)(-1))
762 #define IOP_FASTPERM 0x0001
763 #define IOP_LOOKUP 0x0002
764 #define IOP_NOFOLLOW 0x0004
767 * Keep mostly read-only and often accessed (especially for
768 * the RCU path lookup and 'stat' data) fields at the beginning
769 * of the 'struct inode'
773 unsigned short i_opflags
;
776 unsigned int i_flags
;
778 #ifdef CONFIG_FS_POSIX_ACL
779 struct posix_acl
*i_acl
;
780 struct posix_acl
*i_default_acl
;
783 const struct inode_operations
*i_op
;
784 struct super_block
*i_sb
;
785 struct address_space
*i_mapping
;
787 #ifdef CONFIG_SECURITY
791 /* Stat data, not accessed from path walking */
794 * Filesystems may only read i_nlink directly. They shall use the
795 * following functions for modification:
797 * (set|clear|inc|drop)_nlink
798 * inode_(inc|dec)_link_count
801 const unsigned int i_nlink
;
802 unsigned int __i_nlink
;
806 struct timespec i_atime
;
807 struct timespec i_mtime
;
808 struct timespec i_ctime
;
809 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
810 unsigned short i_bytes
;
811 unsigned int i_blkbits
;
814 #ifdef __NEED_I_SIZE_ORDERED
815 seqcount_t i_size_seqcount
;
819 unsigned long i_state
;
820 struct mutex i_mutex
;
822 unsigned long dirtied_when
; /* jiffies of first dirtying */
824 struct hlist_node i_hash
;
825 struct list_head i_wb_list
; /* backing dev IO list */
826 struct list_head i_lru
; /* inode LRU list */
827 struct list_head i_sb_list
;
829 struct list_head i_dentry
;
830 struct rcu_head i_rcu
;
834 atomic_t i_dio_count
;
835 atomic_t i_writecount
;
836 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
837 struct file_lock
*i_flock
;
838 struct address_space i_data
;
840 struct dquot
*i_dquot
[MAXQUOTAS
];
842 struct list_head i_devices
;
844 struct pipe_inode_info
*i_pipe
;
845 struct block_device
*i_bdev
;
851 #ifdef CONFIG_FSNOTIFY
852 __u32 i_fsnotify_mask
; /* all events this inode cares about */
853 struct hlist_head i_fsnotify_marks
;
857 atomic_t i_readcount
; /* struct files open RO */
859 void *i_private
; /* fs or device private pointer */
862 static inline int inode_unhashed(struct inode
*inode
)
864 return hlist_unhashed(&inode
->i_hash
);
868 * inode->i_mutex nesting subclasses for the lock validator:
870 * 0: the object of the current VFS operation
875 * The locking order between these classes is
876 * parent -> child -> normal -> xattr -> quota
878 enum inode_i_mutex_lock_class
888 * NOTE: in a 32bit arch with a preemptable kernel and
889 * an UP compile the i_size_read/write must be atomic
890 * with respect to the local cpu (unlike with preempt disabled),
891 * but they don't need to be atomic with respect to other cpus like in
892 * true SMP (so they need either to either locally disable irq around
893 * the read or for example on x86 they can be still implemented as a
894 * cmpxchg8b without the need of the lock prefix). For SMP compiles
895 * and 64bit archs it makes no difference if preempt is enabled or not.
897 static inline loff_t
i_size_read(const struct inode
*inode
)
899 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
904 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
905 i_size
= inode
->i_size
;
906 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
908 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
912 i_size
= inode
->i_size
;
916 return inode
->i_size
;
921 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
922 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
923 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
925 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
927 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
928 write_seqcount_begin(&inode
->i_size_seqcount
);
929 inode
->i_size
= i_size
;
930 write_seqcount_end(&inode
->i_size_seqcount
);
931 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
933 inode
->i_size
= i_size
;
936 inode
->i_size
= i_size
;
940 /* Helper functions so that in most cases filesystems will
941 * not need to deal directly with kuid_t and kgid_t and can
942 * instead deal with the raw numeric values that are stored
945 static inline uid_t
i_uid_read(const struct inode
*inode
)
947 return from_kuid(&init_user_ns
, inode
->i_uid
);
950 static inline gid_t
i_gid_read(const struct inode
*inode
)
952 return from_kgid(&init_user_ns
, inode
->i_gid
);
955 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
957 inode
->i_uid
= make_kuid(&init_user_ns
, uid
);
960 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
962 inode
->i_gid
= make_kgid(&init_user_ns
, gid
);
965 static inline unsigned iminor(const struct inode
*inode
)
967 return MINOR(inode
->i_rdev
);
970 static inline unsigned imajor(const struct inode
*inode
)
972 return MAJOR(inode
->i_rdev
);
975 extern struct block_device
*I_BDEV(struct inode
*inode
);
978 rwlock_t lock
; /* protects pid, uid, euid fields */
979 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
980 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
981 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
982 int signum
; /* posix.1b rt signal to be delivered on IO */
986 * Track a single file's readahead state
988 struct file_ra_state
{
989 pgoff_t start
; /* where readahead started */
990 unsigned int size
; /* # of readahead pages */
991 unsigned int async_size
; /* do asynchronous readahead when
992 there are only # of pages ahead */
994 unsigned int ra_pages
; /* Maximum readahead window */
995 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
996 loff_t prev_pos
; /* Cache last read() position */
1000 * Check if @index falls in the readahead windows.
1002 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
1004 return (index
>= ra
->start
&&
1005 index
< ra
->start
+ ra
->size
);
1008 #define FILE_MNT_WRITE_TAKEN 1
1009 #define FILE_MNT_WRITE_RELEASED 2
1013 * fu_list becomes invalid after file_free is called and queued via
1014 * fu_rcuhead for RCU freeing
1017 struct list_head fu_list
;
1018 struct rcu_head fu_rcuhead
;
1021 #define f_dentry f_path.dentry
1022 #define f_vfsmnt f_path.mnt
1023 const struct file_operations
*f_op
;
1026 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
1027 * Must not be taken from IRQ context.
1033 atomic_long_t f_count
;
1034 unsigned int f_flags
;
1037 struct fown_struct f_owner
;
1038 const struct cred
*f_cred
;
1039 struct file_ra_state f_ra
;
1042 #ifdef CONFIG_SECURITY
1045 /* needed for tty driver, and maybe others */
1049 /* Used by fs/eventpoll.c to link all the hooks to this file */
1050 struct list_head f_ep_links
;
1051 struct list_head f_tfile_llink
;
1052 #endif /* #ifdef CONFIG_EPOLL */
1053 struct address_space
*f_mapping
;
1054 #ifdef CONFIG_DEBUG_WRITECOUNT
1055 unsigned long f_mnt_write_state
;
1059 struct file_handle
{
1062 /* file identifier */
1063 unsigned char f_handle
[0];
1066 #define get_file(x) atomic_long_inc(&(x)->f_count)
1067 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
1068 #define file_count(x) atomic_long_read(&(x)->f_count)
1070 #ifdef CONFIG_DEBUG_WRITECOUNT
1071 static inline void file_take_write(struct file
*f
)
1073 WARN_ON(f
->f_mnt_write_state
!= 0);
1074 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
1076 static inline void file_release_write(struct file
*f
)
1078 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
1080 static inline void file_reset_write(struct file
*f
)
1082 f
->f_mnt_write_state
= 0;
1084 static inline void file_check_state(struct file
*f
)
1087 * At this point, either both or neither of these bits
1090 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1091 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1093 static inline int file_check_writeable(struct file
*f
)
1095 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1097 printk(KERN_WARNING
"writeable file with no "
1098 "mnt_want_write()\n");
1102 #else /* !CONFIG_DEBUG_WRITECOUNT */
1103 static inline void file_take_write(struct file
*filp
) {}
1104 static inline void file_release_write(struct file
*filp
) {}
1105 static inline void file_reset_write(struct file
*filp
) {}
1106 static inline void file_check_state(struct file
*filp
) {}
1107 static inline int file_check_writeable(struct file
*filp
)
1111 #endif /* CONFIG_DEBUG_WRITECOUNT */
1113 #define MAX_NON_LFS ((1UL<<31) - 1)
1115 /* Page cache limit. The filesystems should put that into their s_maxbytes
1116 limits, otherwise bad things can happen in VM. */
1117 #if BITS_PER_LONG==32
1118 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1119 #elif BITS_PER_LONG==64
1120 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1125 #define FL_ACCESS 8 /* not trying to lock, just looking */
1126 #define FL_EXISTS 16 /* when unlocking, test for existence */
1127 #define FL_LEASE 32 /* lease held on this file */
1128 #define FL_CLOSE 64 /* unlock on close */
1129 #define FL_SLEEP 128 /* A blocking lock */
1130 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
1131 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
1134 * Special return value from posix_lock_file() and vfs_lock_file() for
1135 * asynchronous locking.
1137 #define FILE_LOCK_DEFERRED 1
1140 * The POSIX file lock owner is determined by
1141 * the "struct files_struct" in the thread group
1142 * (or NULL for no owner - BSD locks).
1144 * Lockd stuffs a "host" pointer into this.
1146 typedef struct files_struct
*fl_owner_t
;
1148 struct file_lock_operations
{
1149 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1150 void (*fl_release_private
)(struct file_lock
*);
1153 struct lock_manager_operations
{
1154 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
1155 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
1156 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
1157 void (*lm_release_private
)(struct file_lock
*);
1158 void (*lm_break
)(struct file_lock
*);
1159 int (*lm_change
)(struct file_lock
**, int);
1162 struct lock_manager
{
1163 struct list_head list
;
1166 void locks_start_grace(struct lock_manager
*);
1167 void locks_end_grace(struct lock_manager
*);
1168 int locks_in_grace(void);
1170 /* that will die - we need it for nfs_lock_info */
1171 #include <linux/nfs_fs_i.h>
1174 struct file_lock
*fl_next
; /* singly linked list for this inode */
1175 struct list_head fl_link
; /* doubly linked list of all locks */
1176 struct list_head fl_block
; /* circular list of blocked processes */
1177 fl_owner_t fl_owner
;
1178 unsigned int fl_flags
;
1179 unsigned char fl_type
;
1180 unsigned int fl_pid
;
1181 struct pid
*fl_nspid
;
1182 wait_queue_head_t fl_wait
;
1183 struct file
*fl_file
;
1187 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1188 /* for lease breaks: */
1189 unsigned long fl_break_time
;
1190 unsigned long fl_downgrade_time
;
1192 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1193 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1195 struct nfs_lock_info nfs_fl
;
1196 struct nfs4_lock_info nfs4_fl
;
1198 struct list_head link
; /* link in AFS vnode's pending_locks list */
1199 int state
; /* state of grant or error if -ve */
1204 /* The following constant reflects the upper bound of the file/locking space */
1206 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1207 #define OFFSET_MAX INT_LIMIT(loff_t)
1208 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1211 #include <linux/fcntl.h>
1213 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1215 #ifdef CONFIG_FILE_LOCKING
1216 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1217 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1218 struct flock __user
*);
1220 #if BITS_PER_LONG == 32
1221 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1222 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1223 struct flock64 __user
*);
1226 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1227 extern int fcntl_getlease(struct file
*filp
);
1230 void locks_free_lock(struct file_lock
*fl
);
1231 extern void locks_init_lock(struct file_lock
*);
1232 extern struct file_lock
* locks_alloc_lock(void);
1233 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1234 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1235 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1236 extern void locks_remove_flock(struct file
*);
1237 extern void locks_release_private(struct file_lock
*);
1238 extern void posix_test_lock(struct file
*, struct file_lock
*);
1239 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1240 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1241 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1242 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1243 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1244 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1245 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1246 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1247 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1248 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1249 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1250 extern int lease_modify(struct file_lock
**, int);
1251 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1252 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1253 extern void locks_delete_block(struct file_lock
*waiter
);
1254 extern void lock_flocks(void);
1255 extern void unlock_flocks(void);
1256 #else /* !CONFIG_FILE_LOCKING */
1257 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1262 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1263 unsigned int cmd
, struct flock __user
*user
)
1268 #if BITS_PER_LONG == 32
1269 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1274 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1275 unsigned int cmd
, struct flock64 __user
*user
)
1280 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1285 static inline int fcntl_getlease(struct file
*filp
)
1290 static inline void locks_init_lock(struct file_lock
*fl
)
1295 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1300 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1305 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1310 static inline void locks_remove_flock(struct file
*filp
)
1315 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1320 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1321 struct file_lock
*conflock
)
1326 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1331 static inline int posix_unblock_lock(struct file
*filp
,
1332 struct file_lock
*waiter
)
1337 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1342 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1343 struct file_lock
*fl
, struct file_lock
*conf
)
1348 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1353 static inline int flock_lock_file_wait(struct file
*filp
,
1354 struct file_lock
*request
)
1359 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1364 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1369 static inline int generic_setlease(struct file
*filp
, long arg
,
1370 struct file_lock
**flp
)
1375 static inline int vfs_setlease(struct file
*filp
, long arg
,
1376 struct file_lock
**lease
)
1381 static inline int lease_modify(struct file_lock
**before
, int arg
)
1386 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1392 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1398 static inline void locks_delete_block(struct file_lock
*waiter
)
1402 static inline void lock_flocks(void)
1406 static inline void unlock_flocks(void)
1410 #endif /* !CONFIG_FILE_LOCKING */
1413 struct fasync_struct
{
1417 struct fasync_struct
*fa_next
; /* singly linked list */
1418 struct file
*fa_file
;
1419 struct rcu_head fa_rcu
;
1422 #define FASYNC_MAGIC 0x4601
1424 /* SMP safe fasync helpers: */
1425 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1426 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1427 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1428 extern struct fasync_struct
*fasync_alloc(void);
1429 extern void fasync_free(struct fasync_struct
*);
1431 /* can be called from interrupts */
1432 extern void kill_fasync(struct fasync_struct
**, int, int);
1434 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1435 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1436 extern void f_delown(struct file
*filp
);
1437 extern pid_t
f_getown(struct file
*filp
);
1438 extern int send_sigurg(struct fown_struct
*fown
);
1444 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1445 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1446 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1447 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1448 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1450 extern struct list_head super_blocks
;
1451 extern spinlock_t sb_lock
;
1453 struct super_block
{
1454 struct list_head s_list
; /* Keep this first */
1455 dev_t s_dev
; /* search index; _not_ kdev_t */
1456 unsigned char s_dirt
;
1457 unsigned char s_blocksize_bits
;
1458 unsigned long s_blocksize
;
1459 loff_t s_maxbytes
; /* Max file size */
1460 struct file_system_type
*s_type
;
1461 const struct super_operations
*s_op
;
1462 const struct dquot_operations
*dq_op
;
1463 const struct quotactl_ops
*s_qcop
;
1464 const struct export_operations
*s_export_op
;
1465 unsigned long s_flags
;
1466 unsigned long s_magic
;
1467 struct dentry
*s_root
;
1468 struct rw_semaphore s_umount
;
1469 struct mutex s_lock
;
1472 #ifdef CONFIG_SECURITY
1475 const struct xattr_handler
**s_xattr
;
1477 struct list_head s_inodes
; /* all inodes */
1478 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1480 struct list_head __percpu
*s_files
;
1482 struct list_head s_files
;
1484 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1485 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1486 struct list_head s_dentry_lru
; /* unused dentry lru */
1487 int s_nr_dentry_unused
; /* # of dentry on lru */
1489 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1490 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp
;
1491 struct list_head s_inode_lru
; /* unused inode lru */
1492 int s_nr_inodes_unused
; /* # of inodes on lru */
1494 struct block_device
*s_bdev
;
1495 struct backing_dev_info
*s_bdi
;
1496 struct mtd_info
*s_mtd
;
1497 struct hlist_node s_instances
;
1498 struct quota_info s_dquot
; /* Diskquota specific options */
1501 wait_queue_head_t s_wait_unfrozen
;
1503 char s_id
[32]; /* Informational name */
1504 u8 s_uuid
[16]; /* UUID */
1506 void *s_fs_info
; /* Filesystem private info */
1507 unsigned int s_max_links
;
1510 /* Granularity of c/m/atime in ns.
1511 Cannot be worse than a second */
1515 * The next field is for VFS *only*. No filesystems have any business
1516 * even looking at it. You had been warned.
1518 struct mutex s_vfs_rename_mutex
; /* Kludge */
1521 * Filesystem subtype. If non-empty the filesystem type field
1522 * in /proc/mounts will be "type.subtype"
1527 * Saved mount options for lazy filesystems using
1528 * generic_show_options()
1530 char __rcu
*s_options
;
1531 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1534 * Saved pool identifier for cleancache (-1 means none)
1536 int cleancache_poolid
;
1538 struct shrinker s_shrink
; /* per-sb shrinker handle */
1540 /* Number of inodes with nlink == 0 but still referenced */
1541 atomic_long_t s_remove_count
;
1543 /* Being remounted read-only */
1544 int s_readonly_remount
;
1547 /* superblock cache pruning functions */
1548 extern void prune_icache_sb(struct super_block
*sb
, int nr_to_scan
);
1549 extern void prune_dcache_sb(struct super_block
*sb
, int nr_to_scan
);
1551 extern struct timespec
current_fs_time(struct super_block
*sb
);
1554 * Snapshotting support.
1558 SB_FREEZE_WRITE
= 1,
1559 SB_FREEZE_TRANS
= 2,
1562 #define vfs_check_frozen(sb, level) \
1563 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1565 extern bool inode_owner_or_capable(const struct inode
*inode
);
1567 /* not quite ready to be deprecated, but... */
1568 extern void lock_super(struct super_block
*);
1569 extern void unlock_super(struct super_block
*);
1572 * VFS helper functions..
1574 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, struct nameidata
*);
1575 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1576 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1577 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1578 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1579 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1580 extern int vfs_unlink(struct inode
*, struct dentry
*);
1581 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1584 * VFS dentry helper functions.
1586 extern void dentry_unhash(struct dentry
*dentry
);
1589 * VFS file helper functions.
1591 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1594 * VFS FS_IOC_FIEMAP helper definitions.
1596 struct fiemap_extent_info
{
1597 unsigned int fi_flags
; /* Flags as passed from user */
1598 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1599 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1600 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1601 fiemap_extent array */
1603 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1604 u64 phys
, u64 len
, u32 flags
);
1605 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1610 * NOTE! These match bits 12..15 of stat.st_mode
1611 * (ie "(i_mode >> 12) & 15").
1613 #define DT_UNKNOWN 0
1624 * This is the "filldir" function type, used by readdir() to let
1625 * the kernel specify what kind of dirent layout it wants to have.
1626 * This allows the kernel to read directories into kernel space or
1627 * to have different dirent layouts depending on the binary type.
1629 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1630 struct block_device_operations
;
1632 /* These macros are for out of kernel modules to test that
1633 * the kernel supports the unlocked_ioctl and compat_ioctl
1634 * fields in struct file_operations. */
1635 #define HAVE_COMPAT_IOCTL 1
1636 #define HAVE_UNLOCKED_IOCTL 1
1638 struct file_operations
{
1639 struct module
*owner
;
1640 loff_t (*llseek
) (struct file
*, loff_t
, int);
1641 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1642 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1643 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1644 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1645 int (*readdir
) (struct file
*, void *, filldir_t
);
1646 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1647 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1648 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1649 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1650 int (*open
) (struct inode
*, struct file
*);
1651 int (*flush
) (struct file
*, fl_owner_t id
);
1652 int (*release
) (struct inode
*, struct file
*);
1653 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1654 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1655 int (*fasync
) (int, struct file
*, int);
1656 int (*lock
) (struct file
*, int, struct file_lock
*);
1657 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1658 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1659 int (*check_flags
)(int);
1660 int (*flock
) (struct file
*, int, struct file_lock
*);
1661 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1662 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1663 int (*setlease
)(struct file
*, long, struct file_lock
**);
1664 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1668 struct inode_operations
{
1669 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1670 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1671 int (*permission
) (struct inode
*, int);
1672 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1674 int (*readlink
) (struct dentry
*, char __user
*,int);
1675 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1677 int (*create
) (struct inode
*,struct dentry
*,umode_t
,struct nameidata
*);
1678 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1679 int (*unlink
) (struct inode
*,struct dentry
*);
1680 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1681 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1682 int (*rmdir
) (struct inode
*,struct dentry
*);
1683 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1684 int (*rename
) (struct inode
*, struct dentry
*,
1685 struct inode
*, struct dentry
*);
1686 void (*truncate
) (struct inode
*);
1687 int (*setattr
) (struct dentry
*, struct iattr
*);
1688 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1689 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1690 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1691 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1692 int (*removexattr
) (struct dentry
*, const char *);
1693 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1695 int (*update_time
)(struct inode
*, struct timespec
*, int);
1696 } ____cacheline_aligned
;
1700 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1701 unsigned long nr_segs
, unsigned long fast_segs
,
1702 struct iovec
*fast_pointer
,
1703 struct iovec
**ret_pointer
);
1705 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1706 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1707 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1708 unsigned long, loff_t
*);
1709 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1710 unsigned long, loff_t
*);
1712 struct super_operations
{
1713 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1714 void (*destroy_inode
)(struct inode
*);
1716 void (*dirty_inode
) (struct inode
*, int flags
);
1717 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1718 int (*drop_inode
) (struct inode
*);
1719 void (*evict_inode
) (struct inode
*);
1720 void (*put_super
) (struct super_block
*);
1721 void (*write_super
) (struct super_block
*);
1722 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1723 int (*freeze_fs
) (struct super_block
*);
1724 int (*unfreeze_fs
) (struct super_block
*);
1725 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1726 int (*remount_fs
) (struct super_block
*, int *, char *);
1727 void (*umount_begin
) (struct super_block
*);
1729 int (*show_options
)(struct seq_file
*, struct dentry
*);
1730 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1731 int (*show_path
)(struct seq_file
*, struct dentry
*);
1732 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1734 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1735 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1737 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1738 int (*nr_cached_objects
)(struct super_block
*);
1739 void (*free_cached_objects
)(struct super_block
*, int);
1743 * Inode state bits. Protected by inode->i_lock
1745 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1746 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1748 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1749 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1750 * various stages of removing an inode.
1752 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1754 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1755 * fdatasync(). i_atime is the usual cause.
1756 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1757 * these changes separately from I_DIRTY_SYNC so that we
1758 * don't have to write inode on fdatasync() when only
1759 * mtime has changed in it.
1760 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1761 * I_NEW Serves as both a mutex and completion notification.
1762 * New inodes set I_NEW. If two processes both create
1763 * the same inode, one of them will release its inode and
1764 * wait for I_NEW to be released before returning.
1765 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1766 * also cause waiting on I_NEW, without I_NEW actually
1767 * being set. find_inode() uses this to prevent returning
1768 * nearly-dead inodes.
1769 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1770 * is zero. I_FREEING must be set when I_WILL_FREE is
1772 * I_FREEING Set when inode is about to be freed but still has dirty
1773 * pages or buffers attached or the inode itself is still
1775 * I_CLEAR Added by clear_inode(). In this state the inode is
1776 * clean and can be destroyed. Inode keeps I_FREEING.
1778 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1779 * prohibited for many purposes. iget() must wait for
1780 * the inode to be completely released, then create it
1781 * anew. Other functions will just ignore such inodes,
1782 * if appropriate. I_NEW is used for waiting.
1784 * I_SYNC Writeback of inode is running. The bit is set during
1785 * data writeback, and cleared with a wakeup on the bit
1786 * address once it is done. The bit is also used to pin
1787 * the inode in memory for flusher thread.
1789 * I_REFERENCED Marks the inode as recently references on the LRU list.
1791 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1793 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1795 #define I_DIRTY_SYNC (1 << 0)
1796 #define I_DIRTY_DATASYNC (1 << 1)
1797 #define I_DIRTY_PAGES (1 << 2)
1799 #define I_NEW (1 << __I_NEW)
1800 #define I_WILL_FREE (1 << 4)
1801 #define I_FREEING (1 << 5)
1802 #define I_CLEAR (1 << 6)
1804 #define I_SYNC (1 << __I_SYNC)
1805 #define I_REFERENCED (1 << 8)
1806 #define __I_DIO_WAKEUP 9
1807 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1809 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1811 extern void __mark_inode_dirty(struct inode
*, int);
1812 static inline void mark_inode_dirty(struct inode
*inode
)
1814 __mark_inode_dirty(inode
, I_DIRTY
);
1817 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1819 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1822 extern void inc_nlink(struct inode
*inode
);
1823 extern void drop_nlink(struct inode
*inode
);
1824 extern void clear_nlink(struct inode
*inode
);
1825 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1827 static inline void inode_inc_link_count(struct inode
*inode
)
1830 mark_inode_dirty(inode
);
1833 static inline void inode_dec_link_count(struct inode
*inode
)
1836 mark_inode_dirty(inode
);
1840 * inode_inc_iversion - increments i_version
1841 * @inode: inode that need to be updated
1843 * Every time the inode is modified, the i_version field will be incremented.
1844 * The filesystem has to be mounted with i_version flag
1847 static inline void inode_inc_iversion(struct inode
*inode
)
1849 spin_lock(&inode
->i_lock
);
1851 spin_unlock(&inode
->i_lock
);
1854 enum file_time_flags
{
1861 extern void touch_atime(struct path
*);
1862 static inline void file_accessed(struct file
*file
)
1864 if (!(file
->f_flags
& O_NOATIME
))
1865 touch_atime(&file
->f_path
);
1868 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1869 int sync_inode_metadata(struct inode
*inode
, int wait
);
1871 struct file_system_type
{
1874 struct dentry
*(*mount
) (struct file_system_type
*, int,
1875 const char *, void *);
1876 void (*kill_sb
) (struct super_block
*);
1877 struct module
*owner
;
1878 struct file_system_type
* next
;
1879 struct hlist_head fs_supers
;
1881 struct lock_class_key s_lock_key
;
1882 struct lock_class_key s_umount_key
;
1883 struct lock_class_key s_vfs_rename_key
;
1885 struct lock_class_key i_lock_key
;
1886 struct lock_class_key i_mutex_key
;
1887 struct lock_class_key i_mutex_dir_key
;
1890 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1891 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1892 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1893 int flags
, const char *dev_name
, void *data
,
1894 int (*fill_super
)(struct super_block
*, void *, int));
1895 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1896 int flags
, void *data
,
1897 int (*fill_super
)(struct super_block
*, void *, int));
1898 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1899 int flags
, void *data
,
1900 int (*fill_super
)(struct super_block
*, void *, int));
1901 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1902 void generic_shutdown_super(struct super_block
*sb
);
1903 void kill_block_super(struct super_block
*sb
);
1904 void kill_anon_super(struct super_block
*sb
);
1905 void kill_litter_super(struct super_block
*sb
);
1906 void deactivate_super(struct super_block
*sb
);
1907 void deactivate_locked_super(struct super_block
*sb
);
1908 int set_anon_super(struct super_block
*s
, void *data
);
1909 int get_anon_bdev(dev_t
*);
1910 void free_anon_bdev(dev_t
);
1911 struct super_block
*sget(struct file_system_type
*type
,
1912 int (*test
)(struct super_block
*,void *),
1913 int (*set
)(struct super_block
*,void *),
1915 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1916 const struct super_operations
*ops
,
1917 const struct dentry_operations
*dops
,
1920 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1921 #define fops_get(fops) \
1922 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1923 #define fops_put(fops) \
1924 do { if (fops) module_put((fops)->owner); } while(0)
1926 extern int register_filesystem(struct file_system_type
*);
1927 extern int unregister_filesystem(struct file_system_type
*);
1928 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1929 #define kern_mount(type) kern_mount_data(type, NULL)
1930 extern void kern_unmount(struct vfsmount
*mnt
);
1931 extern int may_umount_tree(struct vfsmount
*);
1932 extern int may_umount(struct vfsmount
*);
1933 extern long do_mount(char *, char *, char *, unsigned long, void *);
1934 extern struct vfsmount
*collect_mounts(struct path
*);
1935 extern void drop_collected_mounts(struct vfsmount
*);
1936 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1938 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1939 extern int user_statfs(const char __user
*, struct kstatfs
*);
1940 extern int fd_statfs(int, struct kstatfs
*);
1941 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1942 extern int freeze_super(struct super_block
*super
);
1943 extern int thaw_super(struct super_block
*super
);
1944 extern bool our_mnt(struct vfsmount
*mnt
);
1946 extern int current_umask(void);
1949 extern struct kobject
*fs_kobj
;
1951 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1952 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1954 #define FLOCK_VERIFY_READ 1
1955 #define FLOCK_VERIFY_WRITE 2
1957 #ifdef CONFIG_FILE_LOCKING
1958 extern int locks_mandatory_locked(struct inode
*);
1959 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1962 * Candidates for mandatory locking have the setgid bit set
1963 * but no group execute bit - an otherwise meaningless combination.
1966 static inline int __mandatory_lock(struct inode
*ino
)
1968 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1972 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1973 * otherwise these will be advisory locks
1976 static inline int mandatory_lock(struct inode
*ino
)
1978 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1981 static inline int locks_verify_locked(struct inode
*inode
)
1983 if (mandatory_lock(inode
))
1984 return locks_mandatory_locked(inode
);
1988 static inline int locks_verify_truncate(struct inode
*inode
,
1992 if (inode
->i_flock
&& mandatory_lock(inode
))
1993 return locks_mandatory_area(
1994 FLOCK_VERIFY_WRITE
, inode
, filp
,
1995 size
< inode
->i_size
? size
: inode
->i_size
,
1996 (size
< inode
->i_size
? inode
->i_size
- size
1997 : size
- inode
->i_size
)
2002 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2005 return __break_lease(inode
, mode
);
2008 #else /* !CONFIG_FILE_LOCKING */
2009 static inline int locks_mandatory_locked(struct inode
*inode
)
2014 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
2015 struct file
*filp
, loff_t offset
,
2021 static inline int __mandatory_lock(struct inode
*inode
)
2026 static inline int mandatory_lock(struct inode
*inode
)
2031 static inline int locks_verify_locked(struct inode
*inode
)
2036 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2042 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2047 #endif /* CONFIG_FILE_LOCKING */
2051 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2053 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2055 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2057 extern struct file
*filp_open(const char *, int, umode_t
);
2058 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2060 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
2061 const struct cred
*);
2062 extern int filp_close(struct file
*, fl_owner_t id
);
2063 extern char * getname(const char __user
*);
2067 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2070 extern void __init
vfs_caches_init_early(void);
2071 extern void __init
vfs_caches_init(unsigned long);
2073 extern struct kmem_cache
*names_cachep
;
2075 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2076 #define __getname() __getname_gfp(GFP_KERNEL)
2077 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2078 #ifndef CONFIG_AUDITSYSCALL
2079 #define putname(name) __putname(name)
2081 extern void putname(const char *name
);
2085 extern int register_blkdev(unsigned int, const char *);
2086 extern void unregister_blkdev(unsigned int, const char *);
2087 extern struct block_device
*bdget(dev_t
);
2088 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2089 extern void bd_set_size(struct block_device
*, loff_t size
);
2090 extern sector_t
blkdev_max_block(struct block_device
*bdev
);
2091 extern void bd_forget(struct inode
*inode
);
2092 extern void bdput(struct block_device
*);
2093 extern void invalidate_bdev(struct block_device
*);
2094 extern int sync_blockdev(struct block_device
*bdev
);
2095 extern void kill_bdev(struct block_device
*);
2096 extern struct super_block
*freeze_bdev(struct block_device
*);
2097 extern void emergency_thaw_all(void);
2098 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2099 extern int fsync_bdev(struct block_device
*);
2101 static inline void bd_forget(struct inode
*inode
) {}
2102 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2103 static inline void kill_bdev(struct block_device
*bdev
) {}
2104 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2106 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2111 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2116 extern int sync_filesystem(struct super_block
*);
2117 extern const struct file_operations def_blk_fops
;
2118 extern const struct file_operations def_chr_fops
;
2119 extern const struct file_operations bad_sock_fops
;
2120 extern const struct file_operations def_fifo_fops
;
2122 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2123 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2124 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2125 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2126 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2128 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2130 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2132 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2133 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2134 struct gendisk
*disk
);
2136 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2137 struct gendisk
*disk
)
2141 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2142 struct gendisk
*disk
)
2149 #define CHRDEV_MAJOR_HASH_SIZE 255
2150 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2151 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2152 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2153 unsigned int count
, const char *name
,
2154 const struct file_operations
*fops
);
2155 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2156 unsigned int count
, const char *name
);
2157 extern void unregister_chrdev_region(dev_t
, unsigned);
2158 extern void chrdev_show(struct seq_file
*,off_t
);
2160 static inline int register_chrdev(unsigned int major
, const char *name
,
2161 const struct file_operations
*fops
)
2163 return __register_chrdev(major
, 0, 256, name
, fops
);
2166 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2168 __unregister_chrdev(major
, 0, 256, name
);
2171 /* fs/block_dev.c */
2172 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2173 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2176 #define BLKDEV_MAJOR_HASH_SIZE 255
2177 extern const char *__bdevname(dev_t
, char *buffer
);
2178 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2179 extern struct block_device
*lookup_bdev(const char *);
2180 extern void blkdev_show(struct seq_file
*,off_t
);
2183 #define BLKDEV_MAJOR_HASH_SIZE 0
2186 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2188 /* Invalid inode operations -- fs/bad_inode.c */
2189 extern void make_bad_inode(struct inode
*);
2190 extern int is_bad_inode(struct inode
*);
2192 extern const struct file_operations read_pipefifo_fops
;
2193 extern const struct file_operations write_pipefifo_fops
;
2194 extern const struct file_operations rdwr_pipefifo_fops
;
2198 * return READ, READA, or WRITE
2200 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2203 * return data direction, READ or WRITE
2205 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2207 extern void check_disk_size_change(struct gendisk
*disk
,
2208 struct block_device
*bdev
);
2209 extern int revalidate_disk(struct gendisk
*);
2210 extern int check_disk_change(struct block_device
*);
2211 extern int __invalidate_device(struct block_device
*, bool);
2212 extern int invalidate_partition(struct gendisk
*, int);
2214 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2215 pgoff_t start
, pgoff_t end
);
2217 static inline void invalidate_remote_inode(struct inode
*inode
)
2219 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2220 S_ISLNK(inode
->i_mode
))
2221 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2223 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2224 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2225 pgoff_t start
, pgoff_t end
);
2226 extern int write_inode_now(struct inode
*, int);
2227 extern int filemap_fdatawrite(struct address_space
*);
2228 extern int filemap_flush(struct address_space
*);
2229 extern int filemap_fdatawait(struct address_space
*);
2230 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2232 extern int filemap_write_and_wait(struct address_space
*mapping
);
2233 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2234 loff_t lstart
, loff_t lend
);
2235 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2236 loff_t start
, loff_t end
, int sync_mode
);
2237 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2238 loff_t start
, loff_t end
);
2240 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2242 extern int vfs_fsync(struct file
*file
, int datasync
);
2243 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2244 extern void sync_supers(void);
2245 extern void emergency_sync(void);
2246 extern void emergency_remount(void);
2248 extern sector_t
bmap(struct inode
*, sector_t
);
2250 extern int notify_change(struct dentry
*, struct iattr
*);
2251 extern int inode_permission(struct inode
*, int);
2252 extern int generic_permission(struct inode
*, int);
2254 static inline bool execute_ok(struct inode
*inode
)
2256 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2260 * get_write_access() gets write permission for a file.
2261 * put_write_access() releases this write permission.
2262 * This is used for regular files.
2263 * We cannot support write (and maybe mmap read-write shared) accesses and
2264 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2265 * can have the following values:
2266 * 0: no writers, no VM_DENYWRITE mappings
2267 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2268 * > 0: (i_writecount) users are writing to the file.
2270 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2271 * except for the cases where we don't hold i_writecount yet. Then we need to
2272 * use {get,deny}_write_access() - these functions check the sign and refuse
2273 * to do the change if sign is wrong.
2275 static inline int get_write_access(struct inode
*inode
)
2277 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2279 static inline int deny_write_access(struct file
*file
)
2281 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2282 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2284 static inline void put_write_access(struct inode
* inode
)
2286 atomic_dec(&inode
->i_writecount
);
2288 static inline void allow_write_access(struct file
*file
)
2291 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2294 static inline void i_readcount_dec(struct inode
*inode
)
2296 BUG_ON(!atomic_read(&inode
->i_readcount
));
2297 atomic_dec(&inode
->i_readcount
);
2299 static inline void i_readcount_inc(struct inode
*inode
)
2301 atomic_inc(&inode
->i_readcount
);
2304 static inline void i_readcount_dec(struct inode
*inode
)
2308 static inline void i_readcount_inc(struct inode
*inode
)
2313 extern int do_pipe_flags(int *, int);
2314 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2315 extern struct file
*create_write_pipe(int flags
);
2316 extern void free_write_pipe(struct file
*);
2318 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2319 extern struct file
* open_exec(const char *);
2321 /* fs/dcache.c -- generic fs support functions */
2322 extern int is_subdir(struct dentry
*, struct dentry
*);
2323 extern int path_is_under(struct path
*, struct path
*);
2324 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2326 #include <linux/err.h>
2328 /* needed for stackable file system support */
2329 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2331 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2333 extern int inode_init_always(struct super_block
*, struct inode
*);
2334 extern void inode_init_once(struct inode
*);
2335 extern void address_space_init_once(struct address_space
*mapping
);
2336 extern void ihold(struct inode
* inode
);
2337 extern void iput(struct inode
*);
2338 extern struct inode
* igrab(struct inode
*);
2339 extern ino_t
iunique(struct super_block
*, ino_t
);
2340 extern int inode_needs_sync(struct inode
*inode
);
2341 extern int generic_delete_inode(struct inode
*inode
);
2342 static inline int generic_drop_inode(struct inode
*inode
)
2344 return !inode
->i_nlink
|| inode_unhashed(inode
);
2347 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2348 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2350 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2351 int (*test
)(struct inode
*, void *), void *data
);
2352 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2354 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2355 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2356 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2357 extern int insert_inode_locked(struct inode
*);
2358 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2359 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2361 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2363 extern void unlock_new_inode(struct inode
*);
2364 extern unsigned int get_next_ino(void);
2366 extern void __iget(struct inode
* inode
);
2367 extern void iget_failed(struct inode
*);
2368 extern void clear_inode(struct inode
*);
2369 extern void __destroy_inode(struct inode
*);
2370 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2371 extern struct inode
*new_inode(struct super_block
*sb
);
2372 extern void free_inode_nonrcu(struct inode
*inode
);
2373 extern int should_remove_suid(struct dentry
*);
2374 extern int file_remove_suid(struct file
*);
2376 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2377 static inline void insert_inode_hash(struct inode
*inode
)
2379 __insert_inode_hash(inode
, inode
->i_ino
);
2382 extern void __remove_inode_hash(struct inode
*);
2383 static inline void remove_inode_hash(struct inode
*inode
)
2385 if (!inode_unhashed(inode
))
2386 __remove_inode_hash(inode
);
2389 extern void inode_sb_list_add(struct inode
*inode
);
2392 extern void submit_bio(int, struct bio
*);
2393 extern int bdev_read_only(struct block_device
*);
2395 extern int set_blocksize(struct block_device
*, int);
2396 extern int sb_set_blocksize(struct super_block
*, int);
2397 extern int sb_min_blocksize(struct super_block
*, int);
2399 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2400 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2401 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2402 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2403 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2404 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2406 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2407 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2408 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2409 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2410 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2411 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2412 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2413 extern int generic_segment_checks(const struct iovec
*iov
,
2414 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2416 /* fs/block_dev.c */
2417 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2418 unsigned long nr_segs
, loff_t pos
);
2419 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2421 extern void block_sync_page(struct page
*page
);
2424 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2425 struct pipe_inode_info
*, size_t, unsigned int);
2426 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2427 struct pipe_inode_info
*, size_t, unsigned int);
2428 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2429 struct file
*, loff_t
*, size_t, unsigned int);
2430 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2431 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2432 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2433 size_t len
, unsigned int flags
);
2436 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2437 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2438 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2439 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2440 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2441 int origin
, loff_t maxsize
);
2442 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2443 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2445 #ifdef CONFIG_FS_XIP
2446 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2448 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2449 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2450 size_t len
, loff_t
*ppos
);
2451 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2453 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2460 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2461 loff_t file_offset
);
2464 /* need locking between buffered and direct access */
2467 /* filesystem does not support filling holes */
2468 DIO_SKIP_HOLES
= 0x02,
2471 void dio_end_io(struct bio
*bio
, int error
);
2473 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2474 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2475 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2476 dio_submit_t submit_io
, int flags
);
2478 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2479 struct inode
*inode
, const struct iovec
*iov
, loff_t offset
,
2480 unsigned long nr_segs
, get_block_t get_block
)
2482 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2483 offset
, nr_segs
, get_block
, NULL
, NULL
,
2484 DIO_LOCKING
| DIO_SKIP_HOLES
);
2488 void inode_dio_wait(struct inode
*inode
);
2489 void inode_dio_done(struct inode
*inode
);
2491 extern const struct file_operations generic_ro_fops
;
2493 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2495 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2496 extern int vfs_follow_link(struct nameidata
*, const char *);
2497 extern int page_readlink(struct dentry
*, char __user
*, int);
2498 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2499 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2500 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2502 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2503 extern const struct inode_operations page_symlink_inode_operations
;
2504 extern int generic_readlink(struct dentry
*, char __user
*, int);
2505 extern void generic_fillattr(struct inode
*, struct kstat
*);
2506 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2507 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2508 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2509 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2510 loff_t
inode_get_bytes(struct inode
*inode
);
2511 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2513 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2515 extern int vfs_stat(const char __user
*, struct kstat
*);
2516 extern int vfs_lstat(const char __user
*, struct kstat
*);
2517 extern int vfs_fstat(unsigned int, struct kstat
*);
2518 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2520 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2522 extern int __generic_block_fiemap(struct inode
*inode
,
2523 struct fiemap_extent_info
*fieinfo
,
2524 loff_t start
, loff_t len
,
2525 get_block_t
*get_block
);
2526 extern int generic_block_fiemap(struct inode
*inode
,
2527 struct fiemap_extent_info
*fieinfo
, u64 start
,
2528 u64 len
, get_block_t
*get_block
);
2530 extern void get_filesystem(struct file_system_type
*fs
);
2531 extern void put_filesystem(struct file_system_type
*fs
);
2532 extern struct file_system_type
*get_fs_type(const char *name
);
2533 extern struct super_block
*get_super(struct block_device
*);
2534 extern struct super_block
*get_super_thawed(struct block_device
*);
2535 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2536 extern void drop_super(struct super_block
*sb
);
2537 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2538 extern void iterate_supers_type(struct file_system_type
*,
2539 void (*)(struct super_block
*, void *), void *);
2541 extern int dcache_dir_open(struct inode
*, struct file
*);
2542 extern int dcache_dir_close(struct inode
*, struct file
*);
2543 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2544 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2545 extern int simple_setattr(struct dentry
*, struct iattr
*);
2546 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2547 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2548 extern int simple_open(struct inode
*inode
, struct file
*file
);
2549 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2550 extern int simple_unlink(struct inode
*, struct dentry
*);
2551 extern int simple_rmdir(struct inode
*, struct dentry
*);
2552 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2553 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2554 extern int simple_empty(struct dentry
*);
2555 extern int simple_readpage(struct file
*file
, struct page
*page
);
2556 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2557 loff_t pos
, unsigned len
, unsigned flags
,
2558 struct page
**pagep
, void **fsdata
);
2559 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2560 loff_t pos
, unsigned len
, unsigned copied
,
2561 struct page
*page
, void *fsdata
);
2563 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2564 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2565 extern const struct file_operations simple_dir_operations
;
2566 extern const struct inode_operations simple_dir_inode_operations
;
2567 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2568 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2569 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2570 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2571 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2573 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2574 loff_t
*ppos
, const void *from
, size_t available
);
2575 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2576 const void __user
*from
, size_t count
);
2578 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2580 extern int generic_check_addressable(unsigned, u64
);
2582 #ifdef CONFIG_MIGRATION
2583 extern int buffer_migrate_page(struct address_space
*,
2584 struct page
*, struct page
*,
2587 #define buffer_migrate_page NULL
2590 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2591 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2592 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2594 extern int file_update_time(struct file
*file
);
2596 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2597 extern void save_mount_options(struct super_block
*sb
, char *options
);
2598 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2600 static inline ino_t
parent_ino(struct dentry
*dentry
)
2605 * Don't strictly need d_lock here? If the parent ino could change
2606 * then surely we'd have a deeper race in the caller?
2608 spin_lock(&dentry
->d_lock
);
2609 res
= dentry
->d_parent
->d_inode
->i_ino
;
2610 spin_unlock(&dentry
->d_lock
);
2614 /* Transaction based IO helpers */
2617 * An argresp is stored in an allocated page and holds the
2618 * size of the argument or response, along with its content
2620 struct simple_transaction_argresp
{
2625 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2627 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2629 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2630 size_t size
, loff_t
*pos
);
2631 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2633 void simple_transaction_set(struct file
*file
, size_t n
);
2636 * simple attribute files
2638 * These attributes behave similar to those in sysfs:
2640 * Writing to an attribute immediately sets a value, an open file can be
2641 * written to multiple times.
2643 * Reading from an attribute creates a buffer from the value that might get
2644 * read with multiple read calls. When the attribute has been read
2645 * completely, no further read calls are possible until the file is opened
2648 * All attributes contain a text representation of a numeric value
2649 * that are accessed with the get() and set() functions.
2651 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2652 static int __fops ## _open(struct inode *inode, struct file *file) \
2654 __simple_attr_check_format(__fmt, 0ull); \
2655 return simple_attr_open(inode, file, __get, __set, __fmt); \
2657 static const struct file_operations __fops = { \
2658 .owner = THIS_MODULE, \
2659 .open = __fops ## _open, \
2660 .release = simple_attr_release, \
2661 .read = simple_attr_read, \
2662 .write = simple_attr_write, \
2663 .llseek = generic_file_llseek, \
2666 static inline __printf(1, 2)
2667 void __simple_attr_check_format(const char *fmt
, ...)
2669 /* don't do anything, just let the compiler check the arguments; */
2672 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2673 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2675 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2676 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2677 size_t len
, loff_t
*ppos
);
2678 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2679 size_t len
, loff_t
*ppos
);
2682 int proc_nr_files(struct ctl_table
*table
, int write
,
2683 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2684 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2685 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2686 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2687 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2688 int __init
get_filesystem_list(char *buf
);
2690 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2691 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2693 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2694 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2695 (flag & __FMODE_NONOTIFY)))
2697 static inline int is_sxid(umode_t mode
)
2699 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2702 static inline void inode_has_no_xattr(struct inode
*inode
)
2704 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2705 inode
->i_flags
|= S_NOSEC
;
2708 #endif /* __KERNEL__ */
2709 #endif /* _LINUX_FS_H */