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)
97 * Don't update ctime and mtime.
99 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
100 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
102 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
104 /* Expect random access pattern */
105 #define FMODE_RANDOM ((__force fmode_t)0x1000)
107 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
108 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
110 /* File is opened with O_PATH; almost nothing can be done with it */
111 #define FMODE_PATH ((__force fmode_t)0x4000)
113 /* File was opened by fanotify and shouldn't generate fanotify events */
114 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
117 * The below are the various read and write types that we support. Some of
118 * them include behavioral modifiers that send information down to the
119 * block layer and IO scheduler. Terminology:
121 * The block layer uses device plugging to defer IO a little bit, in
122 * the hope that we will see more IO very shortly. This increases
123 * coalescing of adjacent IO and thus reduces the number of IOs we
124 * have to send to the device. It also allows for better queuing,
125 * if the IO isn't mergeable. If the caller is going to be waiting
126 * for the IO, then he must ensure that the device is unplugged so
127 * that the IO is dispatched to the driver.
129 * All IO is handled async in Linux. This is fine for background
130 * writes, but for reads or writes that someone waits for completion
131 * on, we want to notify the block layer and IO scheduler so that they
132 * know about it. That allows them to make better scheduling
133 * decisions. So when the below references 'sync' and 'async', it
134 * is referencing this priority hint.
136 * With that in mind, the available types are:
138 * READ A normal read operation. Device will be plugged.
139 * READ_SYNC A synchronous read. Device is not plugged, caller can
140 * immediately wait on this read without caring about
142 * READA Used for read-ahead operations. Lower priority, and the
143 * block layer could (in theory) choose to ignore this
144 * request if it runs into resource problems.
145 * WRITE A normal async write. Device will be plugged.
146 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
147 * the hint that someone will be waiting on this IO
148 * shortly. The write equivalent of READ_SYNC.
149 * WRITE_ODIRECT Special case write for O_DIRECT only.
150 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
151 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
152 * non-volatile media on completion.
153 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
154 * by a cache flush and data is guaranteed to be on
155 * non-volatile media on completion.
158 #define RW_MASK REQ_WRITE
159 #define RWA_MASK REQ_RAHEAD
162 #define WRITE RW_MASK
163 #define READA RWA_MASK
165 #define READ_SYNC (READ | REQ_SYNC)
166 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
167 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
168 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
169 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
170 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
176 /* public flags for file_system_type */
177 #define FS_REQUIRES_DEV 1
178 #define FS_BINARY_MOUNTDATA 2
179 #define FS_HAS_SUBTYPE 4
180 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
181 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
182 * during rename() internally.
186 * These are the fs-independent mount-flags: up to 32 flags are supported
188 #define MS_RDONLY 1 /* Mount read-only */
189 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
190 #define MS_NODEV 4 /* Disallow access to device special files */
191 #define MS_NOEXEC 8 /* Disallow program execution */
192 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
193 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
194 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
195 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
196 #define MS_NOATIME 1024 /* Do not update access times. */
197 #define MS_NODIRATIME 2048 /* Do not update directory access times */
201 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
202 MS_VERBOSE is deprecated. */
203 #define MS_SILENT 32768
204 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
205 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
206 #define MS_PRIVATE (1<<18) /* change to private */
207 #define MS_SLAVE (1<<19) /* change to slave */
208 #define MS_SHARED (1<<20) /* change to shared */
209 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
210 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
211 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
212 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
213 #define MS_NOSEC (1<<28)
214 #define MS_BORN (1<<29)
215 #define MS_ACTIVE (1<<30)
216 #define MS_NOUSER (1<<31)
219 * Superblock flags that can be altered by MS_REMOUNT
221 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
224 * Old magic mount flag and mask
226 #define MS_MGC_VAL 0xC0ED0000
227 #define MS_MGC_MSK 0xffff0000
229 /* Inode flags - they have nothing to superblock flags now */
231 #define S_SYNC 1 /* Writes are synced at once */
232 #define S_NOATIME 2 /* Do not update access times */
233 #define S_APPEND 4 /* Append-only file */
234 #define S_IMMUTABLE 8 /* Immutable file */
235 #define S_DEAD 16 /* removed, but still open directory */
236 #define S_NOQUOTA 32 /* Inode is not counted to quota */
237 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
238 #define S_NOCMTIME 128 /* Do not update file c/mtime */
239 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
240 #define S_PRIVATE 512 /* Inode is fs-internal */
241 #define S_IMA 1024 /* Inode has an associated IMA struct */
242 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
243 #define S_NOSEC 4096 /* no suid or xattr security attributes */
246 * Note that nosuid etc flags are inode-specific: setting some file-system
247 * flags just means all the inodes inherit those flags by default. It might be
248 * possible to override it selectively if you really wanted to with some
249 * ioctl() that is not currently implemented.
251 * Exception: MS_RDONLY is always applied to the entire file system.
253 * Unfortunately, it is possible to change a filesystems flags with it mounted
254 * with files in use. This means that all of the inodes will not have their
255 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
256 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
258 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
260 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
261 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
262 ((inode)->i_flags & S_SYNC))
263 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
264 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
265 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
266 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
267 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
269 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
270 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
271 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
272 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
274 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
275 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
276 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
277 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
278 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
279 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
280 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
282 /* the read-only stuff doesn't really belong here, but any other place is
283 probably as bad and I don't want to create yet another include file. */
285 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
286 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
287 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
288 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
289 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
290 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
291 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
292 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
293 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
294 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
295 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
296 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
298 #define BLKPG _IO(0x12,105)/* See blkpg.h */
300 /* Some people are morons. Do not use sizeof! */
302 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
303 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
304 /* This was here just to show that the number is taken -
305 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
307 /* A jump here: 108-111 have been used for various private purposes. */
308 #define BLKBSZGET _IOR(0x12,112,size_t)
309 #define BLKBSZSET _IOW(0x12,113,size_t)
310 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
311 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
312 #define BLKTRACESTART _IO(0x12,116)
313 #define BLKTRACESTOP _IO(0x12,117)
314 #define BLKTRACETEARDOWN _IO(0x12,118)
315 #define BLKDISCARD _IO(0x12,119)
316 #define BLKIOMIN _IO(0x12,120)
317 #define BLKIOOPT _IO(0x12,121)
318 #define BLKALIGNOFF _IO(0x12,122)
319 #define BLKPBSZGET _IO(0x12,123)
320 #define BLKDISCARDZEROES _IO(0x12,124)
321 #define BLKSECDISCARD _IO(0x12,125)
323 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
324 #define FIBMAP _IO(0x00,1) /* bmap access */
325 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
326 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
327 #define FITHAW _IOWR('X', 120, int) /* Thaw */
328 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
330 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
331 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
332 #define FS_IOC_GETVERSION _IOR('v', 1, long)
333 #define FS_IOC_SETVERSION _IOW('v', 2, long)
334 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
335 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
336 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
337 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
338 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
341 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
343 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
344 #define FS_UNRM_FL 0x00000002 /* Undelete */
345 #define FS_COMPR_FL 0x00000004 /* Compress file */
346 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
347 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
348 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
349 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
350 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
351 /* Reserved for compression usage... */
352 #define FS_DIRTY_FL 0x00000100
353 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
354 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
355 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
356 /* End compression flags --- maybe not all used */
357 #define FS_BTREE_FL 0x00001000 /* btree format dir */
358 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
359 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
360 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
361 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
362 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
363 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
364 #define FS_EXTENT_FL 0x00080000 /* Extents */
365 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
366 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
367 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
369 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
370 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
373 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
374 #define SYNC_FILE_RANGE_WRITE 2
375 #define SYNC_FILE_RANGE_WAIT_AFTER 4
379 #include <linux/linkage.h>
380 #include <linux/wait.h>
381 #include <linux/kdev_t.h>
382 #include <linux/dcache.h>
383 #include <linux/path.h>
384 #include <linux/stat.h>
385 #include <linux/cache.h>
386 #include <linux/list.h>
387 #include <linux/radix-tree.h>
388 #include <linux/prio_tree.h>
389 #include <linux/init.h>
390 #include <linux/pid.h>
391 #include <linux/mutex.h>
392 #include <linux/capability.h>
393 #include <linux/semaphore.h>
394 #include <linux/fiemap.h>
395 #include <linux/rculist_bl.h>
396 #include <linux/shrinker.h>
397 #include <linux/atomic.h>
399 #include <asm/byteorder.h>
401 struct export_operations
;
407 struct pipe_inode_info
;
408 struct poll_table_struct
;
410 struct vm_area_struct
;
414 extern void __init
inode_init(void);
415 extern void __init
inode_init_early(void);
416 extern void __init
files_init(unsigned long);
418 extern struct files_stat_struct files_stat
;
419 extern unsigned long get_max_files(void);
420 extern int sysctl_nr_open
;
421 extern struct inodes_stat_t inodes_stat
;
422 extern int leases_enable
, lease_break_time
;
425 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
426 struct buffer_head
*bh_result
, int create
);
427 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
428 ssize_t bytes
, void *private, int ret
,
432 * Attribute flags. These should be or-ed together to figure out what
435 #define ATTR_MODE (1 << 0)
436 #define ATTR_UID (1 << 1)
437 #define ATTR_GID (1 << 2)
438 #define ATTR_SIZE (1 << 3)
439 #define ATTR_ATIME (1 << 4)
440 #define ATTR_MTIME (1 << 5)
441 #define ATTR_CTIME (1 << 6)
442 #define ATTR_ATIME_SET (1 << 7)
443 #define ATTR_MTIME_SET (1 << 8)
444 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
445 #define ATTR_ATTR_FLAG (1 << 10)
446 #define ATTR_KILL_SUID (1 << 11)
447 #define ATTR_KILL_SGID (1 << 12)
448 #define ATTR_FILE (1 << 13)
449 #define ATTR_KILL_PRIV (1 << 14)
450 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
451 #define ATTR_TIMES_SET (1 << 16)
454 * This is the Inode Attributes structure, used for notify_change(). It
455 * uses the above definitions as flags, to know which values have changed.
456 * Also, in this manner, a Filesystem can look at only the values it cares
457 * about. Basically, these are the attributes that the VFS layer can
458 * request to change from the FS layer.
460 * Derek Atkins <warlord@MIT.EDU> 94-10-20
463 unsigned int ia_valid
;
468 struct timespec ia_atime
;
469 struct timespec ia_mtime
;
470 struct timespec ia_ctime
;
473 * Not an attribute, but an auxiliary info for filesystems wanting to
474 * implement an ftruncate() like method. NOTE: filesystem should
475 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
477 struct file
*ia_file
;
481 * Includes for diskquotas.
483 #include <linux/quota.h>
486 * enum positive_aop_returns - aop return codes with specific semantics
488 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
489 * completed, that the page is still locked, and
490 * should be considered active. The VM uses this hint
491 * to return the page to the active list -- it won't
492 * be a candidate for writeback again in the near
493 * future. Other callers must be careful to unlock
494 * the page if they get this return. Returned by
497 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
498 * unlocked it and the page might have been truncated.
499 * The caller should back up to acquiring a new page and
500 * trying again. The aop will be taking reasonable
501 * precautions not to livelock. If the caller held a page
502 * reference, it should drop it before retrying. Returned
505 * address_space_operation functions return these large constants to indicate
506 * special semantics to the caller. These are much larger than the bytes in a
507 * page to allow for functions that return the number of bytes operated on in a
511 enum positive_aop_returns
{
512 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
513 AOP_TRUNCATED_PAGE
= 0x80001,
516 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
517 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
518 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
519 * helper code (eg buffer layer)
520 * to clear GFP_FS from alloc */
523 * oh the beauties of C type declarations.
526 struct address_space
;
527 struct writeback_control
;
530 const struct iovec
*iov
;
531 unsigned long nr_segs
;
536 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
537 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
538 size_t iov_iter_copy_from_user(struct page
*page
,
539 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
540 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
541 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
542 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
544 static inline void iov_iter_init(struct iov_iter
*i
,
545 const struct iovec
*iov
, unsigned long nr_segs
,
546 size_t count
, size_t written
)
549 i
->nr_segs
= nr_segs
;
551 i
->count
= count
+ written
;
553 iov_iter_advance(i
, written
);
556 static inline size_t iov_iter_count(struct iov_iter
*i
)
562 * "descriptor" for what we're up to with a read.
563 * This allows us to use the same read code yet
564 * have multiple different users of the data that
565 * we read from a file.
567 * The simplest case just copies the data to user
580 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
581 unsigned long, unsigned long);
583 struct address_space_operations
{
584 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
585 int (*readpage
)(struct file
*, struct page
*);
587 /* Write back some dirty pages from this mapping. */
588 int (*writepages
)(struct address_space
*, struct writeback_control
*);
590 /* Set a page dirty. Return true if this dirtied it */
591 int (*set_page_dirty
)(struct page
*page
);
593 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
594 struct list_head
*pages
, unsigned nr_pages
);
596 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
597 loff_t pos
, unsigned len
, unsigned flags
,
598 struct page
**pagep
, void **fsdata
);
599 int (*write_end
)(struct file
*, struct address_space
*mapping
,
600 loff_t pos
, unsigned len
, unsigned copied
,
601 struct page
*page
, void *fsdata
);
603 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
604 sector_t (*bmap
)(struct address_space
*, sector_t
);
605 void (*invalidatepage
) (struct page
*, unsigned long);
606 int (*releasepage
) (struct page
*, gfp_t
);
607 void (*freepage
)(struct page
*);
608 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
609 loff_t offset
, unsigned long nr_segs
);
610 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
611 void **, unsigned long *);
612 /* migrate the contents of a page to the specified target */
613 int (*migratepage
) (struct address_space
*,
614 struct page
*, struct page
*);
615 int (*launder_page
) (struct page
*);
616 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
618 int (*error_remove_page
)(struct address_space
*, struct page
*);
621 extern const struct address_space_operations empty_aops
;
624 * pagecache_write_begin/pagecache_write_end must be used by general code
625 * to write into the pagecache.
627 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
628 loff_t pos
, unsigned len
, unsigned flags
,
629 struct page
**pagep
, void **fsdata
);
631 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
632 loff_t pos
, unsigned len
, unsigned copied
,
633 struct page
*page
, void *fsdata
);
635 struct backing_dev_info
;
636 struct address_space
{
637 struct inode
*host
; /* owner: inode, block_device */
638 struct radix_tree_root page_tree
; /* radix tree of all pages */
639 spinlock_t tree_lock
; /* and lock protecting it */
640 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
641 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
642 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
643 struct mutex i_mmap_mutex
; /* protect tree, count, list */
644 /* Protected by tree_lock together with the radix tree */
645 unsigned long nrpages
; /* number of total pages */
646 pgoff_t writeback_index
;/* writeback starts here */
647 const struct address_space_operations
*a_ops
; /* methods */
648 unsigned long flags
; /* error bits/gfp mask */
649 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
650 spinlock_t private_lock
; /* for use by the address_space */
651 struct list_head private_list
; /* ditto */
652 struct address_space
*assoc_mapping
; /* ditto */
653 } __attribute__((aligned(sizeof(long))));
655 * On most architectures that alignment is already the case; but
656 * must be enforced here for CRIS, to let the least significant bit
657 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
660 struct block_device
{
661 dev_t bd_dev
; /* not a kdev_t - it's a search key */
663 struct inode
* bd_inode
; /* will die */
664 struct super_block
* bd_super
;
665 struct mutex bd_mutex
; /* open/close mutex */
666 struct list_head bd_inodes
;
670 bool bd_write_holder
;
672 struct list_head bd_holder_disks
;
674 struct block_device
* bd_contains
;
675 unsigned bd_block_size
;
676 struct hd_struct
* bd_part
;
677 /* number of times partitions within this device have been opened. */
678 unsigned bd_part_count
;
680 struct gendisk
* bd_disk
;
681 struct list_head bd_list
;
683 * Private data. You must have bd_claim'ed the block_device
684 * to use this. NOTE: bd_claim allows an owner to claim
685 * the same device multiple times, the owner must take special
686 * care to not mess up bd_private for that case.
688 unsigned long bd_private
;
690 /* The counter of freeze processes */
691 int bd_fsfreeze_count
;
692 /* Mutex for freeze */
693 struct mutex bd_fsfreeze_mutex
;
697 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
700 #define PAGECACHE_TAG_DIRTY 0
701 #define PAGECACHE_TAG_WRITEBACK 1
702 #define PAGECACHE_TAG_TOWRITE 2
704 int mapping_tagged(struct address_space
*mapping
, int tag
);
707 * Might pages of this file be mapped into userspace?
709 static inline int mapping_mapped(struct address_space
*mapping
)
711 return !prio_tree_empty(&mapping
->i_mmap
) ||
712 !list_empty(&mapping
->i_mmap_nonlinear
);
716 * Might pages of this file have been modified in userspace?
717 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
718 * marks vma as VM_SHARED if it is shared, and the file was opened for
719 * writing i.e. vma may be mprotected writable even if now readonly.
721 static inline int mapping_writably_mapped(struct address_space
*mapping
)
723 return mapping
->i_mmap_writable
!= 0;
727 * Use sequence counter to get consistent i_size on 32-bit processors.
729 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
730 #include <linux/seqlock.h>
731 #define __NEED_I_SIZE_ORDERED
732 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
734 #define i_size_ordered_init(inode) do { } while (0)
738 #define ACL_NOT_CACHED ((void *)(-1))
740 #define IOP_FASTPERM 0x0001
741 #define IOP_LOOKUP 0x0002
742 #define IOP_NOFOLLOW 0x0004
745 * Keep mostly read-only and often accessed (especially for
746 * the RCU path lookup and 'stat' data) fields at the beginning
747 * of the 'struct inode'
751 unsigned short i_opflags
;
754 unsigned int i_flags
;
756 #ifdef CONFIG_FS_POSIX_ACL
757 struct posix_acl
*i_acl
;
758 struct posix_acl
*i_default_acl
;
761 const struct inode_operations
*i_op
;
762 struct super_block
*i_sb
;
763 struct address_space
*i_mapping
;
765 #ifdef CONFIG_SECURITY
769 /* Stat data, not accessed from path walking */
772 * Filesystems may only read i_nlink directly. They shall use the
773 * following functions for modification:
775 * (set|clear|inc|drop)_nlink
776 * inode_(inc|dec)_link_count
779 const unsigned int i_nlink
;
780 unsigned int __i_nlink
;
783 struct timespec i_atime
;
784 struct timespec i_mtime
;
785 struct timespec i_ctime
;
786 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
787 unsigned short i_bytes
;
791 #ifdef __NEED_I_SIZE_ORDERED
792 seqcount_t i_size_seqcount
;
796 unsigned long i_state
;
797 struct mutex i_mutex
;
799 unsigned long dirtied_when
; /* jiffies of first dirtying */
801 struct hlist_node i_hash
;
802 struct list_head i_wb_list
; /* backing dev IO list */
803 struct list_head i_lru
; /* inode LRU list */
804 struct list_head i_sb_list
;
806 struct list_head i_dentry
;
807 struct rcu_head i_rcu
;
810 unsigned int i_blkbits
;
812 atomic_t i_dio_count
;
813 atomic_t i_writecount
;
814 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
815 struct file_lock
*i_flock
;
816 struct address_space i_data
;
818 struct dquot
*i_dquot
[MAXQUOTAS
];
820 struct list_head i_devices
;
822 struct pipe_inode_info
*i_pipe
;
823 struct block_device
*i_bdev
;
829 #ifdef CONFIG_FSNOTIFY
830 __u32 i_fsnotify_mask
; /* all events this inode cares about */
831 struct hlist_head i_fsnotify_marks
;
835 atomic_t i_readcount
; /* struct files open RO */
837 void *i_private
; /* fs or device private pointer */
840 static inline int inode_unhashed(struct inode
*inode
)
842 return hlist_unhashed(&inode
->i_hash
);
846 * inode->i_mutex nesting subclasses for the lock validator:
848 * 0: the object of the current VFS operation
853 * The locking order between these classes is
854 * parent -> child -> normal -> xattr -> quota
856 enum inode_i_mutex_lock_class
866 * NOTE: in a 32bit arch with a preemptable kernel and
867 * an UP compile the i_size_read/write must be atomic
868 * with respect to the local cpu (unlike with preempt disabled),
869 * but they don't need to be atomic with respect to other cpus like in
870 * true SMP (so they need either to either locally disable irq around
871 * the read or for example on x86 they can be still implemented as a
872 * cmpxchg8b without the need of the lock prefix). For SMP compiles
873 * and 64bit archs it makes no difference if preempt is enabled or not.
875 static inline loff_t
i_size_read(const struct inode
*inode
)
877 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
882 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
883 i_size
= inode
->i_size
;
884 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
886 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
890 i_size
= inode
->i_size
;
894 return inode
->i_size
;
899 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
900 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
901 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
903 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
905 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
906 write_seqcount_begin(&inode
->i_size_seqcount
);
907 inode
->i_size
= i_size
;
908 write_seqcount_end(&inode
->i_size_seqcount
);
909 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
911 inode
->i_size
= i_size
;
914 inode
->i_size
= i_size
;
918 static inline unsigned iminor(const struct inode
*inode
)
920 return MINOR(inode
->i_rdev
);
923 static inline unsigned imajor(const struct inode
*inode
)
925 return MAJOR(inode
->i_rdev
);
928 extern struct block_device
*I_BDEV(struct inode
*inode
);
931 rwlock_t lock
; /* protects pid, uid, euid fields */
932 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
933 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
934 uid_t uid
, euid
; /* uid/euid of process setting the owner */
935 int signum
; /* posix.1b rt signal to be delivered on IO */
939 * Track a single file's readahead state
941 struct file_ra_state
{
942 pgoff_t start
; /* where readahead started */
943 unsigned int size
; /* # of readahead pages */
944 unsigned int async_size
; /* do asynchronous readahead when
945 there are only # of pages ahead */
947 unsigned int ra_pages
; /* Maximum readahead window */
948 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
949 loff_t prev_pos
; /* Cache last read() position */
953 * Check if @index falls in the readahead windows.
955 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
957 return (index
>= ra
->start
&&
958 index
< ra
->start
+ ra
->size
);
961 #define FILE_MNT_WRITE_TAKEN 1
962 #define FILE_MNT_WRITE_RELEASED 2
966 * fu_list becomes invalid after file_free is called and queued via
967 * fu_rcuhead for RCU freeing
970 struct list_head fu_list
;
971 struct rcu_head fu_rcuhead
;
974 #define f_dentry f_path.dentry
975 #define f_vfsmnt f_path.mnt
976 const struct file_operations
*f_op
;
979 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
980 * Must not be taken from IRQ context.
986 atomic_long_t f_count
;
987 unsigned int f_flags
;
990 struct fown_struct f_owner
;
991 const struct cred
*f_cred
;
992 struct file_ra_state f_ra
;
995 #ifdef CONFIG_SECURITY
998 /* needed for tty driver, and maybe others */
1002 /* Used by fs/eventpoll.c to link all the hooks to this file */
1003 struct list_head f_ep_links
;
1004 #endif /* #ifdef CONFIG_EPOLL */
1005 struct address_space
*f_mapping
;
1006 #ifdef CONFIG_DEBUG_WRITECOUNT
1007 unsigned long f_mnt_write_state
;
1011 struct file_handle
{
1014 /* file identifier */
1015 unsigned char f_handle
[0];
1018 #define get_file(x) atomic_long_inc(&(x)->f_count)
1019 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
1020 #define file_count(x) atomic_long_read(&(x)->f_count)
1022 #ifdef CONFIG_DEBUG_WRITECOUNT
1023 static inline void file_take_write(struct file
*f
)
1025 WARN_ON(f
->f_mnt_write_state
!= 0);
1026 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
1028 static inline void file_release_write(struct file
*f
)
1030 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
1032 static inline void file_reset_write(struct file
*f
)
1034 f
->f_mnt_write_state
= 0;
1036 static inline void file_check_state(struct file
*f
)
1039 * At this point, either both or neither of these bits
1042 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1043 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1045 static inline int file_check_writeable(struct file
*f
)
1047 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1049 printk(KERN_WARNING
"writeable file with no "
1050 "mnt_want_write()\n");
1054 #else /* !CONFIG_DEBUG_WRITECOUNT */
1055 static inline void file_take_write(struct file
*filp
) {}
1056 static inline void file_release_write(struct file
*filp
) {}
1057 static inline void file_reset_write(struct file
*filp
) {}
1058 static inline void file_check_state(struct file
*filp
) {}
1059 static inline int file_check_writeable(struct file
*filp
)
1063 #endif /* CONFIG_DEBUG_WRITECOUNT */
1065 #define MAX_NON_LFS ((1UL<<31) - 1)
1067 /* Page cache limit. The filesystems should put that into their s_maxbytes
1068 limits, otherwise bad things can happen in VM. */
1069 #if BITS_PER_LONG==32
1070 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1071 #elif BITS_PER_LONG==64
1072 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1077 #define FL_ACCESS 8 /* not trying to lock, just looking */
1078 #define FL_EXISTS 16 /* when unlocking, test for existence */
1079 #define FL_LEASE 32 /* lease held on this file */
1080 #define FL_CLOSE 64 /* unlock on close */
1081 #define FL_SLEEP 128 /* A blocking lock */
1082 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
1083 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
1086 * Special return value from posix_lock_file() and vfs_lock_file() for
1087 * asynchronous locking.
1089 #define FILE_LOCK_DEFERRED 1
1092 * The POSIX file lock owner is determined by
1093 * the "struct files_struct" in the thread group
1094 * (or NULL for no owner - BSD locks).
1096 * Lockd stuffs a "host" pointer into this.
1098 typedef struct files_struct
*fl_owner_t
;
1100 struct file_lock_operations
{
1101 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1102 void (*fl_release_private
)(struct file_lock
*);
1105 struct lock_manager_operations
{
1106 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
1107 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
1108 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
1109 void (*lm_release_private
)(struct file_lock
*);
1110 void (*lm_break
)(struct file_lock
*);
1111 int (*lm_change
)(struct file_lock
**, int);
1114 struct lock_manager
{
1115 struct list_head list
;
1118 void locks_start_grace(struct lock_manager
*);
1119 void locks_end_grace(struct lock_manager
*);
1120 int locks_in_grace(void);
1122 /* that will die - we need it for nfs_lock_info */
1123 #include <linux/nfs_fs_i.h>
1126 struct file_lock
*fl_next
; /* singly linked list for this inode */
1127 struct list_head fl_link
; /* doubly linked list of all locks */
1128 struct list_head fl_block
; /* circular list of blocked processes */
1129 fl_owner_t fl_owner
;
1130 unsigned int fl_flags
;
1131 unsigned char fl_type
;
1132 unsigned int fl_pid
;
1133 struct pid
*fl_nspid
;
1134 wait_queue_head_t fl_wait
;
1135 struct file
*fl_file
;
1139 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1140 /* for lease breaks: */
1141 unsigned long fl_break_time
;
1142 unsigned long fl_downgrade_time
;
1144 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1145 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1147 struct nfs_lock_info nfs_fl
;
1148 struct nfs4_lock_info nfs4_fl
;
1150 struct list_head link
; /* link in AFS vnode's pending_locks list */
1151 int state
; /* state of grant or error if -ve */
1156 /* The following constant reflects the upper bound of the file/locking space */
1158 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1159 #define OFFSET_MAX INT_LIMIT(loff_t)
1160 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1163 #include <linux/fcntl.h>
1165 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1167 #ifdef CONFIG_FILE_LOCKING
1168 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1169 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1170 struct flock __user
*);
1172 #if BITS_PER_LONG == 32
1173 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1174 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1175 struct flock64 __user
*);
1178 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1179 extern int fcntl_getlease(struct file
*filp
);
1182 void locks_free_lock(struct file_lock
*fl
);
1183 extern void locks_init_lock(struct file_lock
*);
1184 extern struct file_lock
* locks_alloc_lock(void);
1185 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1186 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1187 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1188 extern void locks_remove_flock(struct file
*);
1189 extern void locks_release_private(struct file_lock
*);
1190 extern void posix_test_lock(struct file
*, struct file_lock
*);
1191 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1192 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1193 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1194 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1195 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1196 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1197 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1198 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1199 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1200 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1201 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1202 extern int lease_modify(struct file_lock
**, int);
1203 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1204 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1205 extern void lock_flocks(void);
1206 extern void unlock_flocks(void);
1207 #else /* !CONFIG_FILE_LOCKING */
1208 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1213 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1214 unsigned int cmd
, struct flock __user
*user
)
1219 #if BITS_PER_LONG == 32
1220 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1225 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1226 unsigned int cmd
, struct flock64 __user
*user
)
1231 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1236 static inline int fcntl_getlease(struct file
*filp
)
1241 static inline void locks_init_lock(struct file_lock
*fl
)
1246 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1251 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1256 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1261 static inline void locks_remove_flock(struct file
*filp
)
1266 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1271 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1272 struct file_lock
*conflock
)
1277 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1282 static inline int posix_unblock_lock(struct file
*filp
,
1283 struct file_lock
*waiter
)
1288 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1293 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1294 struct file_lock
*fl
, struct file_lock
*conf
)
1299 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1304 static inline int flock_lock_file_wait(struct file
*filp
,
1305 struct file_lock
*request
)
1310 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1315 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1320 static inline int generic_setlease(struct file
*filp
, long arg
,
1321 struct file_lock
**flp
)
1326 static inline int vfs_setlease(struct file
*filp
, long arg
,
1327 struct file_lock
**lease
)
1332 static inline int lease_modify(struct file_lock
**before
, int arg
)
1337 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1343 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1349 static inline void lock_flocks(void)
1353 static inline void unlock_flocks(void)
1357 #endif /* !CONFIG_FILE_LOCKING */
1360 struct fasync_struct
{
1364 struct fasync_struct
*fa_next
; /* singly linked list */
1365 struct file
*fa_file
;
1366 struct rcu_head fa_rcu
;
1369 #define FASYNC_MAGIC 0x4601
1371 /* SMP safe fasync helpers: */
1372 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1373 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1374 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1375 extern struct fasync_struct
*fasync_alloc(void);
1376 extern void fasync_free(struct fasync_struct
*);
1378 /* can be called from interrupts */
1379 extern void kill_fasync(struct fasync_struct
**, int, int);
1381 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1382 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1383 extern void f_delown(struct file
*filp
);
1384 extern pid_t
f_getown(struct file
*filp
);
1385 extern int send_sigurg(struct fown_struct
*fown
);
1391 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1392 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1393 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1394 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1395 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1397 extern struct list_head super_blocks
;
1398 extern spinlock_t sb_lock
;
1400 struct super_block
{
1401 struct list_head s_list
; /* Keep this first */
1402 dev_t s_dev
; /* search index; _not_ kdev_t */
1403 unsigned char s_dirt
;
1404 unsigned char s_blocksize_bits
;
1405 unsigned long s_blocksize
;
1406 loff_t s_maxbytes
; /* Max file size */
1407 struct file_system_type
*s_type
;
1408 const struct super_operations
*s_op
;
1409 const struct dquot_operations
*dq_op
;
1410 const struct quotactl_ops
*s_qcop
;
1411 const struct export_operations
*s_export_op
;
1412 unsigned long s_flags
;
1413 unsigned long s_magic
;
1414 struct dentry
*s_root
;
1415 struct rw_semaphore s_umount
;
1416 struct mutex s_lock
;
1419 #ifdef CONFIG_SECURITY
1422 const struct xattr_handler
**s_xattr
;
1424 struct list_head s_inodes
; /* all inodes */
1425 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1427 struct list_head __percpu
*s_files
;
1429 struct list_head s_files
;
1431 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1432 struct list_head s_dentry_lru
; /* unused dentry lru */
1433 int s_nr_dentry_unused
; /* # of dentry on lru */
1435 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1436 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp
;
1437 struct list_head s_inode_lru
; /* unused inode lru */
1438 int s_nr_inodes_unused
; /* # of inodes on lru */
1440 struct block_device
*s_bdev
;
1441 struct backing_dev_info
*s_bdi
;
1442 struct mtd_info
*s_mtd
;
1443 struct list_head s_instances
;
1444 struct quota_info s_dquot
; /* Diskquota specific options */
1447 wait_queue_head_t s_wait_unfrozen
;
1449 char s_id
[32]; /* Informational name */
1450 u8 s_uuid
[16]; /* UUID */
1452 void *s_fs_info
; /* Filesystem private info */
1455 /* Granularity of c/m/atime in ns.
1456 Cannot be worse than a second */
1460 * The next field is for VFS *only*. No filesystems have any business
1461 * even looking at it. You had been warned.
1463 struct mutex s_vfs_rename_mutex
; /* Kludge */
1466 * Filesystem subtype. If non-empty the filesystem type field
1467 * in /proc/mounts will be "type.subtype"
1472 * Saved mount options for lazy filesystems using
1473 * generic_show_options()
1475 char __rcu
*s_options
;
1476 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1479 * Saved pool identifier for cleancache (-1 means none)
1481 int cleancache_poolid
;
1483 struct shrinker s_shrink
; /* per-sb shrinker handle */
1486 /* superblock cache pruning functions */
1487 extern void prune_icache_sb(struct super_block
*sb
, int nr_to_scan
);
1488 extern void prune_dcache_sb(struct super_block
*sb
, int nr_to_scan
);
1490 extern struct timespec
current_fs_time(struct super_block
*sb
);
1493 * Snapshotting support.
1497 SB_FREEZE_WRITE
= 1,
1498 SB_FREEZE_TRANS
= 2,
1501 #define vfs_check_frozen(sb, level) \
1502 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1505 * until VFS tracks user namespaces for inodes, just make all files
1506 * belong to init_user_ns
1508 extern struct user_namespace init_user_ns
;
1509 #define inode_userns(inode) (&init_user_ns)
1510 extern bool inode_owner_or_capable(const struct inode
*inode
);
1512 /* not quite ready to be deprecated, but... */
1513 extern void lock_super(struct super_block
*);
1514 extern void unlock_super(struct super_block
*);
1517 * VFS helper functions..
1519 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
1520 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
1521 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
1522 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1523 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1524 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1525 extern int vfs_unlink(struct inode
*, struct dentry
*);
1526 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1529 * VFS dentry helper functions.
1531 extern void dentry_unhash(struct dentry
*dentry
);
1534 * VFS file helper functions.
1536 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1539 * VFS FS_IOC_FIEMAP helper definitions.
1541 struct fiemap_extent_info
{
1542 unsigned int fi_flags
; /* Flags as passed from user */
1543 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1544 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1545 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1546 fiemap_extent array */
1548 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1549 u64 phys
, u64 len
, u32 flags
);
1550 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1555 * NOTE! These match bits 12..15 of stat.st_mode
1556 * (ie "(i_mode >> 12) & 15").
1558 #define DT_UNKNOWN 0
1569 * This is the "filldir" function type, used by readdir() to let
1570 * the kernel specify what kind of dirent layout it wants to have.
1571 * This allows the kernel to read directories into kernel space or
1572 * to have different dirent layouts depending on the binary type.
1574 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1575 struct block_device_operations
;
1577 /* These macros are for out of kernel modules to test that
1578 * the kernel supports the unlocked_ioctl and compat_ioctl
1579 * fields in struct file_operations. */
1580 #define HAVE_COMPAT_IOCTL 1
1581 #define HAVE_UNLOCKED_IOCTL 1
1583 struct file_operations
{
1584 struct module
*owner
;
1585 loff_t (*llseek
) (struct file
*, loff_t
, int);
1586 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1587 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1588 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1589 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1590 int (*readdir
) (struct file
*, void *, filldir_t
);
1591 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1592 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1593 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1594 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1595 int (*open
) (struct inode
*, struct file
*);
1596 int (*flush
) (struct file
*, fl_owner_t id
);
1597 int (*release
) (struct inode
*, struct file
*);
1598 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1599 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1600 int (*fasync
) (int, struct file
*, int);
1601 int (*lock
) (struct file
*, int, struct file_lock
*);
1602 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1603 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1604 int (*check_flags
)(int);
1605 int (*flock
) (struct file
*, int, struct file_lock
*);
1606 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1607 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1608 int (*setlease
)(struct file
*, long, struct file_lock
**);
1609 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1613 struct inode_operations
{
1614 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1615 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1616 int (*permission
) (struct inode
*, int);
1617 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1619 int (*readlink
) (struct dentry
*, char __user
*,int);
1620 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1622 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1623 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1624 int (*unlink
) (struct inode
*,struct dentry
*);
1625 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1626 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1627 int (*rmdir
) (struct inode
*,struct dentry
*);
1628 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1629 int (*rename
) (struct inode
*, struct dentry
*,
1630 struct inode
*, struct dentry
*);
1631 void (*truncate
) (struct inode
*);
1632 int (*setattr
) (struct dentry
*, struct iattr
*);
1633 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1634 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1635 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1636 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1637 int (*removexattr
) (struct dentry
*, const char *);
1638 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1639 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1641 } ____cacheline_aligned
;
1645 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1646 unsigned long nr_segs
, unsigned long fast_segs
,
1647 struct iovec
*fast_pointer
,
1648 struct iovec
**ret_pointer
,
1651 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1652 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1653 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1654 unsigned long, loff_t
*);
1655 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1656 unsigned long, loff_t
*);
1658 struct super_operations
{
1659 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1660 void (*destroy_inode
)(struct inode
*);
1662 void (*dirty_inode
) (struct inode
*, int flags
);
1663 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1664 int (*drop_inode
) (struct inode
*);
1665 void (*evict_inode
) (struct inode
*);
1666 void (*put_super
) (struct super_block
*);
1667 void (*write_super
) (struct super_block
*);
1668 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1669 int (*freeze_fs
) (struct super_block
*);
1670 int (*unfreeze_fs
) (struct super_block
*);
1671 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1672 int (*remount_fs
) (struct super_block
*, int *, char *);
1673 void (*umount_begin
) (struct super_block
*);
1675 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1676 int (*show_devname
)(struct seq_file
*, struct vfsmount
*);
1677 int (*show_path
)(struct seq_file
*, struct vfsmount
*);
1678 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1680 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1681 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1683 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1684 int (*nr_cached_objects
)(struct super_block
*);
1685 void (*free_cached_objects
)(struct super_block
*, int);
1689 * Inode state bits. Protected by inode->i_lock
1691 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1692 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1694 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1695 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1696 * various stages of removing an inode.
1698 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1700 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1701 * fdatasync(). i_atime is the usual cause.
1702 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1703 * these changes separately from I_DIRTY_SYNC so that we
1704 * don't have to write inode on fdatasync() when only
1705 * mtime has changed in it.
1706 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1707 * I_NEW Serves as both a mutex and completion notification.
1708 * New inodes set I_NEW. If two processes both create
1709 * the same inode, one of them will release its inode and
1710 * wait for I_NEW to be released before returning.
1711 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1712 * also cause waiting on I_NEW, without I_NEW actually
1713 * being set. find_inode() uses this to prevent returning
1714 * nearly-dead inodes.
1715 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1716 * is zero. I_FREEING must be set when I_WILL_FREE is
1718 * I_FREEING Set when inode is about to be freed but still has dirty
1719 * pages or buffers attached or the inode itself is still
1721 * I_CLEAR Added by end_writeback(). In this state the inode is clean
1722 * and can be destroyed. Inode keeps I_FREEING.
1724 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1725 * prohibited for many purposes. iget() must wait for
1726 * the inode to be completely released, then create it
1727 * anew. Other functions will just ignore such inodes,
1728 * if appropriate. I_NEW is used for waiting.
1730 * I_SYNC Synchonized write of dirty inode data. The bits is
1731 * set during data writeback, and cleared with a wakeup
1732 * on the bit address once it is done.
1734 * I_REFERENCED Marks the inode as recently references on the LRU list.
1736 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1738 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1740 #define I_DIRTY_SYNC (1 << 0)
1741 #define I_DIRTY_DATASYNC (1 << 1)
1742 #define I_DIRTY_PAGES (1 << 2)
1744 #define I_NEW (1 << __I_NEW)
1745 #define I_WILL_FREE (1 << 4)
1746 #define I_FREEING (1 << 5)
1747 #define I_CLEAR (1 << 6)
1749 #define I_SYNC (1 << __I_SYNC)
1750 #define I_REFERENCED (1 << 8)
1751 #define __I_DIO_WAKEUP 9
1752 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1754 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1756 extern void __mark_inode_dirty(struct inode
*, int);
1757 static inline void mark_inode_dirty(struct inode
*inode
)
1759 __mark_inode_dirty(inode
, I_DIRTY
);
1762 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1764 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1768 * set_nlink - directly set an inode's link count
1770 * @nlink: new nlink (should be non-zero)
1772 * This is a low-level filesystem helper to replace any
1773 * direct filesystem manipulation of i_nlink.
1775 static inline void set_nlink(struct inode
*inode
, unsigned int nlink
)
1777 inode
->__i_nlink
= nlink
;
1781 * inc_nlink - directly increment an inode's link count
1784 * This is a low-level filesystem helper to replace any
1785 * direct filesystem manipulation of i_nlink. Currently,
1786 * it is only here for parity with dec_nlink().
1788 static inline void inc_nlink(struct inode
*inode
)
1793 static inline void inode_inc_link_count(struct inode
*inode
)
1796 mark_inode_dirty(inode
);
1800 * drop_nlink - directly drop an inode's link count
1803 * This is a low-level filesystem helper to replace any
1804 * direct filesystem manipulation of i_nlink. In cases
1805 * where we are attempting to track writes to the
1806 * filesystem, a decrement to zero means an imminent
1807 * write when the file is truncated and actually unlinked
1808 * on the filesystem.
1810 static inline void drop_nlink(struct inode
*inode
)
1816 * clear_nlink - directly zero an inode's link count
1819 * This is a low-level filesystem helper to replace any
1820 * direct filesystem manipulation of i_nlink. See
1821 * drop_nlink() for why we care about i_nlink hitting zero.
1823 static inline void clear_nlink(struct inode
*inode
)
1825 inode
->__i_nlink
= 0;
1828 static inline void inode_dec_link_count(struct inode
*inode
)
1831 mark_inode_dirty(inode
);
1835 * inode_inc_iversion - increments i_version
1836 * @inode: inode that need to be updated
1838 * Every time the inode is modified, the i_version field will be incremented.
1839 * The filesystem has to be mounted with i_version flag
1842 static inline void inode_inc_iversion(struct inode
*inode
)
1844 spin_lock(&inode
->i_lock
);
1846 spin_unlock(&inode
->i_lock
);
1849 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1850 static inline void file_accessed(struct file
*file
)
1852 if (!(file
->f_flags
& O_NOATIME
))
1853 touch_atime(file
->f_path
.mnt
, file
->f_path
.dentry
);
1856 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1857 int sync_inode_metadata(struct inode
*inode
, int wait
);
1859 struct file_system_type
{
1862 struct dentry
*(*mount
) (struct file_system_type
*, int,
1863 const char *, void *);
1864 void (*kill_sb
) (struct super_block
*);
1865 struct module
*owner
;
1866 struct file_system_type
* next
;
1867 struct list_head fs_supers
;
1869 struct lock_class_key s_lock_key
;
1870 struct lock_class_key s_umount_key
;
1871 struct lock_class_key s_vfs_rename_key
;
1873 struct lock_class_key i_lock_key
;
1874 struct lock_class_key i_mutex_key
;
1875 struct lock_class_key i_mutex_dir_key
;
1878 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1879 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1880 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1881 int flags
, const char *dev_name
, void *data
,
1882 int (*fill_super
)(struct super_block
*, void *, int));
1883 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1884 int flags
, void *data
,
1885 int (*fill_super
)(struct super_block
*, void *, int));
1886 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1887 int flags
, void *data
,
1888 int (*fill_super
)(struct super_block
*, void *, int));
1889 void generic_shutdown_super(struct super_block
*sb
);
1890 void kill_block_super(struct super_block
*sb
);
1891 void kill_anon_super(struct super_block
*sb
);
1892 void kill_litter_super(struct super_block
*sb
);
1893 void deactivate_super(struct super_block
*sb
);
1894 void deactivate_locked_super(struct super_block
*sb
);
1895 int set_anon_super(struct super_block
*s
, void *data
);
1896 int get_anon_bdev(dev_t
*);
1897 void free_anon_bdev(dev_t
);
1898 struct super_block
*sget(struct file_system_type
*type
,
1899 int (*test
)(struct super_block
*,void *),
1900 int (*set
)(struct super_block
*,void *),
1902 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1903 const struct super_operations
*ops
,
1904 const struct dentry_operations
*dops
,
1907 static inline void sb_mark_dirty(struct super_block
*sb
)
1911 static inline void sb_mark_clean(struct super_block
*sb
)
1915 static inline int sb_is_dirty(struct super_block
*sb
)
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 statfs_by_dentry(struct dentry
*, struct kstatfs
*);
1942 extern int freeze_super(struct super_block
*super
);
1943 extern int thaw_super(struct super_block
*super
);
1945 extern int current_umask(void);
1948 extern struct kobject
*fs_kobj
;
1950 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1951 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1953 #define FLOCK_VERIFY_READ 1
1954 #define FLOCK_VERIFY_WRITE 2
1956 #ifdef CONFIG_FILE_LOCKING
1957 extern int locks_mandatory_locked(struct inode
*);
1958 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1961 * Candidates for mandatory locking have the setgid bit set
1962 * but no group execute bit - an otherwise meaningless combination.
1965 static inline int __mandatory_lock(struct inode
*ino
)
1967 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1971 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1972 * otherwise these will be advisory locks
1975 static inline int mandatory_lock(struct inode
*ino
)
1977 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1980 static inline int locks_verify_locked(struct inode
*inode
)
1982 if (mandatory_lock(inode
))
1983 return locks_mandatory_locked(inode
);
1987 static inline int locks_verify_truncate(struct inode
*inode
,
1991 if (inode
->i_flock
&& mandatory_lock(inode
))
1992 return locks_mandatory_area(
1993 FLOCK_VERIFY_WRITE
, inode
, filp
,
1994 size
< inode
->i_size
? size
: inode
->i_size
,
1995 (size
< inode
->i_size
? inode
->i_size
- size
1996 : size
- inode
->i_size
)
2001 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2004 return __break_lease(inode
, mode
);
2007 #else /* !CONFIG_FILE_LOCKING */
2008 static inline int locks_mandatory_locked(struct inode
*inode
)
2013 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
2014 struct file
*filp
, loff_t offset
,
2020 static inline int __mandatory_lock(struct inode
*inode
)
2025 static inline int mandatory_lock(struct inode
*inode
)
2030 static inline int locks_verify_locked(struct inode
*inode
)
2035 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2041 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2046 #endif /* CONFIG_FILE_LOCKING */
2050 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2052 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2054 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2056 extern struct file
*filp_open(const char *, int, int);
2057 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2059 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
2060 const struct cred
*);
2061 extern int filp_close(struct file
*, fl_owner_t id
);
2062 extern char * getname(const char __user
*);
2066 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2069 extern void __init
vfs_caches_init_early(void);
2070 extern void __init
vfs_caches_init(unsigned long);
2072 extern struct kmem_cache
*names_cachep
;
2074 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2075 #define __getname() __getname_gfp(GFP_KERNEL)
2076 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2077 #ifndef CONFIG_AUDITSYSCALL
2078 #define putname(name) __putname(name)
2080 extern void putname(const char *name
);
2084 extern int register_blkdev(unsigned int, const char *);
2085 extern void unregister_blkdev(unsigned int, const char *);
2086 extern struct block_device
*bdget(dev_t
);
2087 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2088 extern void bd_set_size(struct block_device
*, loff_t size
);
2089 extern void bd_forget(struct inode
*inode
);
2090 extern void bdput(struct block_device
*);
2091 extern void invalidate_bdev(struct block_device
*);
2092 extern int sync_blockdev(struct block_device
*bdev
);
2093 extern struct super_block
*freeze_bdev(struct block_device
*);
2094 extern void emergency_thaw_all(void);
2095 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2096 extern int fsync_bdev(struct block_device
*);
2098 static inline void bd_forget(struct inode
*inode
) {}
2099 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2100 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2102 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2107 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2112 extern int sync_filesystem(struct super_block
*);
2113 extern const struct file_operations def_blk_fops
;
2114 extern const struct file_operations def_chr_fops
;
2115 extern const struct file_operations bad_sock_fops
;
2116 extern const struct file_operations def_fifo_fops
;
2118 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2119 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2120 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2121 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2122 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2124 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2126 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2128 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2129 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2130 struct gendisk
*disk
);
2132 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2133 struct gendisk
*disk
)
2137 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2138 struct gendisk
*disk
)
2145 #define CHRDEV_MAJOR_HASH_SIZE 255
2146 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2147 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2148 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2149 unsigned int count
, const char *name
,
2150 const struct file_operations
*fops
);
2151 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2152 unsigned int count
, const char *name
);
2153 extern void unregister_chrdev_region(dev_t
, unsigned);
2154 extern void chrdev_show(struct seq_file
*,off_t
);
2156 static inline int register_chrdev(unsigned int major
, const char *name
,
2157 const struct file_operations
*fops
)
2159 return __register_chrdev(major
, 0, 256, name
, fops
);
2162 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2164 __unregister_chrdev(major
, 0, 256, name
);
2167 /* fs/block_dev.c */
2168 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2169 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2172 #define BLKDEV_MAJOR_HASH_SIZE 255
2173 extern const char *__bdevname(dev_t
, char *buffer
);
2174 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2175 extern struct block_device
*lookup_bdev(const char *);
2176 extern void blkdev_show(struct seq_file
*,off_t
);
2179 #define BLKDEV_MAJOR_HASH_SIZE 0
2182 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2184 /* Invalid inode operations -- fs/bad_inode.c */
2185 extern void make_bad_inode(struct inode
*);
2186 extern int is_bad_inode(struct inode
*);
2188 extern const struct file_operations read_pipefifo_fops
;
2189 extern const struct file_operations write_pipefifo_fops
;
2190 extern const struct file_operations rdwr_pipefifo_fops
;
2192 extern int fs_may_remount_ro(struct super_block
*);
2196 * return READ, READA, or WRITE
2198 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2201 * return data direction, READ or WRITE
2203 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2205 extern void check_disk_size_change(struct gendisk
*disk
,
2206 struct block_device
*bdev
);
2207 extern int revalidate_disk(struct gendisk
*);
2208 extern int check_disk_change(struct block_device
*);
2209 extern int __invalidate_device(struct block_device
*, bool);
2210 extern int invalidate_partition(struct gendisk
*, int);
2212 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2213 pgoff_t start
, pgoff_t end
);
2215 static inline void invalidate_remote_inode(struct inode
*inode
)
2217 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2218 S_ISLNK(inode
->i_mode
))
2219 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2221 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2222 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2223 pgoff_t start
, pgoff_t end
);
2224 extern int write_inode_now(struct inode
*, int);
2225 extern int filemap_fdatawrite(struct address_space
*);
2226 extern int filemap_flush(struct address_space
*);
2227 extern int filemap_fdatawait(struct address_space
*);
2228 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2230 extern int filemap_write_and_wait(struct address_space
*mapping
);
2231 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2232 loff_t lstart
, loff_t lend
);
2233 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2234 loff_t start
, loff_t end
, int sync_mode
);
2235 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2236 loff_t start
, loff_t end
);
2238 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2240 extern int vfs_fsync(struct file
*file
, int datasync
);
2241 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2242 extern void sync_supers(void);
2243 extern void emergency_sync(void);
2244 extern void emergency_remount(void);
2246 extern sector_t
bmap(struct inode
*, sector_t
);
2248 extern int notify_change(struct dentry
*, struct iattr
*);
2249 extern int inode_permission(struct inode
*, int);
2250 extern int generic_permission(struct inode
*, int);
2252 static inline bool execute_ok(struct inode
*inode
)
2254 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2258 * get_write_access() gets write permission for a file.
2259 * put_write_access() releases this write permission.
2260 * This is used for regular files.
2261 * We cannot support write (and maybe mmap read-write shared) accesses and
2262 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2263 * can have the following values:
2264 * 0: no writers, no VM_DENYWRITE mappings
2265 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2266 * > 0: (i_writecount) users are writing to the file.
2268 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2269 * except for the cases where we don't hold i_writecount yet. Then we need to
2270 * use {get,deny}_write_access() - these functions check the sign and refuse
2271 * to do the change if sign is wrong.
2273 static inline int get_write_access(struct inode
*inode
)
2275 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2277 static inline int deny_write_access(struct file
*file
)
2279 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2280 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2282 static inline void put_write_access(struct inode
* inode
)
2284 atomic_dec(&inode
->i_writecount
);
2286 static inline void allow_write_access(struct file
*file
)
2289 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2292 static inline void i_readcount_dec(struct inode
*inode
)
2294 BUG_ON(!atomic_read(&inode
->i_readcount
));
2295 atomic_dec(&inode
->i_readcount
);
2297 static inline void i_readcount_inc(struct inode
*inode
)
2299 atomic_inc(&inode
->i_readcount
);
2302 static inline void i_readcount_dec(struct inode
*inode
)
2306 static inline void i_readcount_inc(struct inode
*inode
)
2311 extern int do_pipe_flags(int *, int);
2312 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2313 extern struct file
*create_write_pipe(int flags
);
2314 extern void free_write_pipe(struct file
*);
2316 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2317 extern struct file
* open_exec(const char *);
2319 /* fs/dcache.c -- generic fs support functions */
2320 extern int is_subdir(struct dentry
*, struct dentry
*);
2321 extern int path_is_under(struct path
*, struct path
*);
2322 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2324 #include <linux/err.h>
2326 /* needed for stackable file system support */
2327 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2329 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2331 extern int inode_init_always(struct super_block
*, struct inode
*);
2332 extern void inode_init_once(struct inode
*);
2333 extern void address_space_init_once(struct address_space
*mapping
);
2334 extern void ihold(struct inode
* inode
);
2335 extern void iput(struct inode
*);
2336 extern struct inode
* igrab(struct inode
*);
2337 extern ino_t
iunique(struct super_block
*, ino_t
);
2338 extern int inode_needs_sync(struct inode
*inode
);
2339 extern int generic_delete_inode(struct inode
*inode
);
2340 extern int generic_drop_inode(struct inode
*inode
);
2342 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2343 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2345 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2346 int (*test
)(struct inode
*, void *), void *data
);
2347 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2349 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2350 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2351 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2352 extern int insert_inode_locked(struct inode
*);
2353 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2354 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2356 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2358 extern void unlock_new_inode(struct inode
*);
2359 extern unsigned int get_next_ino(void);
2361 extern void __iget(struct inode
* inode
);
2362 extern void iget_failed(struct inode
*);
2363 extern void end_writeback(struct inode
*);
2364 extern void __destroy_inode(struct inode
*);
2365 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2366 extern struct inode
*new_inode(struct super_block
*sb
);
2367 extern void free_inode_nonrcu(struct inode
*inode
);
2368 extern int should_remove_suid(struct dentry
*);
2369 extern int file_remove_suid(struct file
*);
2371 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2372 static inline void insert_inode_hash(struct inode
*inode
)
2374 __insert_inode_hash(inode
, inode
->i_ino
);
2377 extern void __remove_inode_hash(struct inode
*);
2378 static inline void remove_inode_hash(struct inode
*inode
)
2380 if (!inode_unhashed(inode
))
2381 __remove_inode_hash(inode
);
2384 extern void inode_sb_list_add(struct inode
*inode
);
2387 extern void submit_bio(int, struct bio
*);
2388 extern int bdev_read_only(struct block_device
*);
2390 extern int set_blocksize(struct block_device
*, int);
2391 extern int sb_set_blocksize(struct super_block
*, int);
2392 extern int sb_min_blocksize(struct super_block
*, int);
2394 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2395 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2396 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2397 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2398 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2399 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2401 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2402 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2403 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2404 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2405 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2406 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2407 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2408 extern int generic_segment_checks(const struct iovec
*iov
,
2409 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2411 /* fs/block_dev.c */
2412 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2413 unsigned long nr_segs
, loff_t pos
);
2414 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2418 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2419 struct pipe_inode_info
*, size_t, unsigned int);
2420 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2421 struct pipe_inode_info
*, size_t, unsigned int);
2422 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2423 struct file
*, loff_t
*, size_t, unsigned int);
2424 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2425 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2426 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2427 size_t len
, unsigned int flags
);
2430 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2431 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2432 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2433 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2434 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2435 int origin
, loff_t maxsize
);
2436 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2437 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2439 #ifdef CONFIG_FS_XIP
2440 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2442 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2443 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2444 size_t len
, loff_t
*ppos
);
2445 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2447 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2454 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2455 loff_t file_offset
);
2458 /* need locking between buffered and direct access */
2461 /* filesystem does not support filling holes */
2462 DIO_SKIP_HOLES
= 0x02,
2465 void dio_end_io(struct bio
*bio
, int error
);
2466 void inode_dio_wait(struct inode
*inode
);
2467 void inode_dio_done(struct inode
*inode
);
2469 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2470 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2471 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2472 dio_submit_t submit_io
, int flags
);
2474 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2475 struct inode
*inode
, const struct iovec
*iov
, loff_t offset
,
2476 unsigned long nr_segs
, get_block_t get_block
)
2478 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2479 offset
, nr_segs
, get_block
, NULL
, NULL
,
2480 DIO_LOCKING
| DIO_SKIP_HOLES
);
2483 static inline void inode_dio_wait(struct inode
*inode
)
2488 extern const struct file_operations generic_ro_fops
;
2490 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2492 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2493 extern int vfs_follow_link(struct nameidata
*, const char *);
2494 extern int page_readlink(struct dentry
*, char __user
*, int);
2495 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2496 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2497 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2499 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2500 extern const struct inode_operations page_symlink_inode_operations
;
2501 extern int generic_readlink(struct dentry
*, char __user
*, int);
2502 extern void generic_fillattr(struct inode
*, struct kstat
*);
2503 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2504 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2505 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2506 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2507 loff_t
inode_get_bytes(struct inode
*inode
);
2508 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2510 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2512 extern int vfs_stat(const char __user
*, struct kstat
*);
2513 extern int vfs_lstat(const char __user
*, struct kstat
*);
2514 extern int vfs_fstat(unsigned int, struct kstat
*);
2515 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2517 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2519 extern int __generic_block_fiemap(struct inode
*inode
,
2520 struct fiemap_extent_info
*fieinfo
,
2521 loff_t start
, loff_t len
,
2522 get_block_t
*get_block
);
2523 extern int generic_block_fiemap(struct inode
*inode
,
2524 struct fiemap_extent_info
*fieinfo
, u64 start
,
2525 u64 len
, get_block_t
*get_block
);
2527 extern void get_filesystem(struct file_system_type
*fs
);
2528 extern void put_filesystem(struct file_system_type
*fs
);
2529 extern struct file_system_type
*get_fs_type(const char *name
);
2530 extern struct super_block
*get_super(struct block_device
*);
2531 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2532 extern struct super_block
*user_get_super(dev_t
);
2533 extern void drop_super(struct super_block
*sb
);
2534 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2535 extern void iterate_supers_type(struct file_system_type
*,
2536 void (*)(struct super_block
*, void *), void *);
2538 extern int dcache_dir_open(struct inode
*, struct file
*);
2539 extern int dcache_dir_close(struct inode
*, struct file
*);
2540 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2541 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2542 extern int simple_setattr(struct dentry
*, struct iattr
*);
2543 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2544 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2545 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2546 extern int simple_unlink(struct inode
*, struct dentry
*);
2547 extern int simple_rmdir(struct inode
*, struct dentry
*);
2548 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2549 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2550 extern int simple_empty(struct dentry
*);
2551 extern int simple_readpage(struct file
*file
, struct page
*page
);
2552 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2553 loff_t pos
, unsigned len
, unsigned flags
,
2554 struct page
**pagep
, void **fsdata
);
2555 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2556 loff_t pos
, unsigned len
, unsigned copied
,
2557 struct page
*page
, void *fsdata
);
2559 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2560 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2561 extern const struct file_operations simple_dir_operations
;
2562 extern const struct inode_operations simple_dir_inode_operations
;
2563 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2564 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2565 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2566 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2567 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2569 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2570 loff_t
*ppos
, const void *from
, size_t available
);
2571 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2572 const void __user
*from
, size_t count
);
2574 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2576 extern int generic_check_addressable(unsigned, u64
);
2578 #ifdef CONFIG_MIGRATION
2579 extern int buffer_migrate_page(struct address_space
*,
2580 struct page
*, struct page
*);
2582 #define buffer_migrate_page NULL
2585 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2586 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2587 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2589 extern void file_update_time(struct file
*file
);
2591 extern int generic_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
2592 extern void save_mount_options(struct super_block
*sb
, char *options
);
2593 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2595 static inline ino_t
parent_ino(struct dentry
*dentry
)
2600 * Don't strictly need d_lock here? If the parent ino could change
2601 * then surely we'd have a deeper race in the caller?
2603 spin_lock(&dentry
->d_lock
);
2604 res
= dentry
->d_parent
->d_inode
->i_ino
;
2605 spin_unlock(&dentry
->d_lock
);
2609 /* Transaction based IO helpers */
2612 * An argresp is stored in an allocated page and holds the
2613 * size of the argument or response, along with its content
2615 struct simple_transaction_argresp
{
2620 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2622 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2624 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2625 size_t size
, loff_t
*pos
);
2626 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2628 void simple_transaction_set(struct file
*file
, size_t n
);
2631 * simple attribute files
2633 * These attributes behave similar to those in sysfs:
2635 * Writing to an attribute immediately sets a value, an open file can be
2636 * written to multiple times.
2638 * Reading from an attribute creates a buffer from the value that might get
2639 * read with multiple read calls. When the attribute has been read
2640 * completely, no further read calls are possible until the file is opened
2643 * All attributes contain a text representation of a numeric value
2644 * that are accessed with the get() and set() functions.
2646 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2647 static int __fops ## _open(struct inode *inode, struct file *file) \
2649 __simple_attr_check_format(__fmt, 0ull); \
2650 return simple_attr_open(inode, file, __get, __set, __fmt); \
2652 static const struct file_operations __fops = { \
2653 .owner = THIS_MODULE, \
2654 .open = __fops ## _open, \
2655 .release = simple_attr_release, \
2656 .read = simple_attr_read, \
2657 .write = simple_attr_write, \
2658 .llseek = generic_file_llseek, \
2661 static inline __printf(1, 2)
2662 void __simple_attr_check_format(const char *fmt
, ...)
2664 /* don't do anything, just let the compiler check the arguments; */
2667 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2668 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2670 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2671 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2672 size_t len
, loff_t
*ppos
);
2673 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2674 size_t len
, loff_t
*ppos
);
2677 int proc_nr_files(struct ctl_table
*table
, int write
,
2678 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2679 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2680 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2681 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2682 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2683 int __init
get_filesystem_list(char *buf
);
2685 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2686 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2688 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2689 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2690 (flag & __FMODE_NONOTIFY)))
2692 static inline int is_sxid(mode_t mode
)
2694 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2697 static inline void inode_has_no_xattr(struct inode
*inode
)
2699 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2700 inode
->i_flags
|= S_NOSEC
;
2703 #endif /* __KERNEL__ */
2704 #endif /* _LINUX_FS_H */