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 */
68 #define MAY_NOT_BLOCK 128 /* called from RCU mode, don't block */
71 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
72 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
75 /* file is open for reading */
76 #define FMODE_READ ((__force fmode_t)0x1)
77 /* file is open for writing */
78 #define FMODE_WRITE ((__force fmode_t)0x2)
79 /* file is seekable */
80 #define FMODE_LSEEK ((__force fmode_t)0x4)
81 /* file can be accessed using pread */
82 #define FMODE_PREAD ((__force fmode_t)0x8)
83 /* file can be accessed using pwrite */
84 #define FMODE_PWRITE ((__force fmode_t)0x10)
85 /* File is opened for execution with sys_execve / sys_uselib */
86 #define FMODE_EXEC ((__force fmode_t)0x20)
87 /* File is opened with O_NDELAY (only set for block devices) */
88 #define FMODE_NDELAY ((__force fmode_t)0x40)
89 /* File is opened with O_EXCL (only set for block devices) */
90 #define FMODE_EXCL ((__force fmode_t)0x80)
91 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
92 (specialy hack for floppy.c) */
93 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
96 * Don't update ctime and mtime.
98 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
99 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
101 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
103 /* Expect random access pattern */
104 #define FMODE_RANDOM ((__force fmode_t)0x1000)
106 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
107 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
109 /* File is opened with O_PATH; almost nothing can be done with it */
110 #define FMODE_PATH ((__force fmode_t)0x4000)
112 /* File was opened by fanotify and shouldn't generate fanotify events */
113 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
116 * The below are the various read and write types that we support. Some of
117 * them include behavioral modifiers that send information down to the
118 * block layer and IO scheduler. Terminology:
120 * The block layer uses device plugging to defer IO a little bit, in
121 * the hope that we will see more IO very shortly. This increases
122 * coalescing of adjacent IO and thus reduces the number of IOs we
123 * have to send to the device. It also allows for better queuing,
124 * if the IO isn't mergeable. If the caller is going to be waiting
125 * for the IO, then he must ensure that the device is unplugged so
126 * that the IO is dispatched to the driver.
128 * All IO is handled async in Linux. This is fine for background
129 * writes, but for reads or writes that someone waits for completion
130 * on, we want to notify the block layer and IO scheduler so that they
131 * know about it. That allows them to make better scheduling
132 * decisions. So when the below references 'sync' and 'async', it
133 * is referencing this priority hint.
135 * With that in mind, the available types are:
137 * READ A normal read operation. Device will be plugged.
138 * READ_SYNC A synchronous read. Device is not plugged, caller can
139 * immediately wait on this read without caring about
141 * READA Used for read-ahead operations. Lower priority, and the
142 * block layer could (in theory) choose to ignore this
143 * request if it runs into resource problems.
144 * WRITE A normal async write. Device will be plugged.
145 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
146 * the hint that someone will be waiting on this IO
147 * shortly. The write equivalent of READ_SYNC.
148 * WRITE_ODIRECT Special case write for O_DIRECT only.
149 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
150 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
151 * non-volatile media on completion.
152 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
153 * by a cache flush and data is guaranteed to be on
154 * non-volatile media on completion.
157 #define RW_MASK REQ_WRITE
158 #define RWA_MASK REQ_RAHEAD
161 #define WRITE RW_MASK
162 #define READA RWA_MASK
164 #define READ_SYNC (READ | REQ_SYNC)
165 #define READ_META (READ | REQ_META)
166 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
167 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
168 #define WRITE_META (WRITE | REQ_META)
169 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
170 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
171 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
177 /* public flags for file_system_type */
178 #define FS_REQUIRES_DEV 1
179 #define FS_BINARY_MOUNTDATA 2
180 #define FS_HAS_SUBTYPE 4
181 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
182 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
183 * during rename() internally.
187 * These are the fs-independent mount-flags: up to 32 flags are supported
189 #define MS_RDONLY 1 /* Mount read-only */
190 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
191 #define MS_NODEV 4 /* Disallow access to device special files */
192 #define MS_NOEXEC 8 /* Disallow program execution */
193 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
194 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
195 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
196 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
197 #define MS_NOATIME 1024 /* Do not update access times. */
198 #define MS_NODIRATIME 2048 /* Do not update directory access times */
202 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
203 MS_VERBOSE is deprecated. */
204 #define MS_SILENT 32768
205 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
206 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
207 #define MS_PRIVATE (1<<18) /* change to private */
208 #define MS_SLAVE (1<<19) /* change to slave */
209 #define MS_SHARED (1<<20) /* change to shared */
210 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
211 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
212 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
213 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
214 #define MS_NOSEC (1<<28)
215 #define MS_BORN (1<<29)
216 #define MS_ACTIVE (1<<30)
217 #define MS_NOUSER (1<<31)
220 * Superblock flags that can be altered by MS_REMOUNT
222 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
225 * Old magic mount flag and mask
227 #define MS_MGC_VAL 0xC0ED0000
228 #define MS_MGC_MSK 0xffff0000
230 /* Inode flags - they have nothing to superblock flags now */
232 #define S_SYNC 1 /* Writes are synced at once */
233 #define S_NOATIME 2 /* Do not update access times */
234 #define S_APPEND 4 /* Append-only file */
235 #define S_IMMUTABLE 8 /* Immutable file */
236 #define S_DEAD 16 /* removed, but still open directory */
237 #define S_NOQUOTA 32 /* Inode is not counted to quota */
238 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
239 #define S_NOCMTIME 128 /* Do not update file c/mtime */
240 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
241 #define S_PRIVATE 512 /* Inode is fs-internal */
242 #define S_IMA 1024 /* Inode has an associated IMA struct */
243 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
244 #define S_NOSEC 4096 /* no suid or xattr security attributes */
247 * Note that nosuid etc flags are inode-specific: setting some file-system
248 * flags just means all the inodes inherit those flags by default. It might be
249 * possible to override it selectively if you really wanted to with some
250 * ioctl() that is not currently implemented.
252 * Exception: MS_RDONLY is always applied to the entire file system.
254 * Unfortunately, it is possible to change a filesystems flags with it mounted
255 * with files in use. This means that all of the inodes will not have their
256 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
257 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
259 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
261 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
262 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
263 ((inode)->i_flags & S_SYNC))
264 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
265 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
266 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
267 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
268 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
270 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
271 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
272 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
273 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
275 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
276 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
277 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
278 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
279 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
280 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
281 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
283 /* the read-only stuff doesn't really belong here, but any other place is
284 probably as bad and I don't want to create yet another include file. */
286 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
287 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
288 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
289 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
290 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
291 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
292 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
293 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
294 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
295 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
296 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
297 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
299 #define BLKPG _IO(0x12,105)/* See blkpg.h */
301 /* Some people are morons. Do not use sizeof! */
303 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
304 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
305 /* This was here just to show that the number is taken -
306 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
308 /* A jump here: 108-111 have been used for various private purposes. */
309 #define BLKBSZGET _IOR(0x12,112,size_t)
310 #define BLKBSZSET _IOW(0x12,113,size_t)
311 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
312 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
313 #define BLKTRACESTART _IO(0x12,116)
314 #define BLKTRACESTOP _IO(0x12,117)
315 #define BLKTRACETEARDOWN _IO(0x12,118)
316 #define BLKDISCARD _IO(0x12,119)
317 #define BLKIOMIN _IO(0x12,120)
318 #define BLKIOOPT _IO(0x12,121)
319 #define BLKALIGNOFF _IO(0x12,122)
320 #define BLKPBSZGET _IO(0x12,123)
321 #define BLKDISCARDZEROES _IO(0x12,124)
322 #define BLKSECDISCARD _IO(0x12,125)
324 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
325 #define FIBMAP _IO(0x00,1) /* bmap access */
326 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
327 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
328 #define FITHAW _IOWR('X', 120, int) /* Thaw */
329 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
331 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
332 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
333 #define FS_IOC_GETVERSION _IOR('v', 1, long)
334 #define FS_IOC_SETVERSION _IOW('v', 2, long)
335 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
336 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
337 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
338 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
339 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
342 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
344 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
345 #define FS_UNRM_FL 0x00000002 /* Undelete */
346 #define FS_COMPR_FL 0x00000004 /* Compress file */
347 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
348 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
349 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
350 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
351 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
352 /* Reserved for compression usage... */
353 #define FS_DIRTY_FL 0x00000100
354 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
355 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
356 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
357 /* End compression flags --- maybe not all used */
358 #define FS_BTREE_FL 0x00001000 /* btree format dir */
359 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
360 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
361 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
362 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
363 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
364 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
365 #define FS_EXTENT_FL 0x00080000 /* Extents */
366 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
367 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
368 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
370 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
371 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
374 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
375 #define SYNC_FILE_RANGE_WRITE 2
376 #define SYNC_FILE_RANGE_WAIT_AFTER 4
380 #include <linux/linkage.h>
381 #include <linux/wait.h>
382 #include <linux/kdev_t.h>
383 #include <linux/dcache.h>
384 #include <linux/path.h>
385 #include <linux/stat.h>
386 #include <linux/cache.h>
387 #include <linux/list.h>
388 #include <linux/radix-tree.h>
389 #include <linux/prio_tree.h>
390 #include <linux/init.h>
391 #include <linux/pid.h>
392 #include <linux/mutex.h>
393 #include <linux/capability.h>
394 #include <linux/semaphore.h>
395 #include <linux/fiemap.h>
396 #include <linux/rculist_bl.h>
397 #include <linux/shrinker.h>
398 #include <linux/atomic.h>
400 #include <asm/byteorder.h>
402 struct export_operations
;
408 struct pipe_inode_info
;
409 struct poll_table_struct
;
411 struct vm_area_struct
;
415 extern void __init
inode_init(void);
416 extern void __init
inode_init_early(void);
417 extern void __init
files_init(unsigned long);
419 extern struct files_stat_struct files_stat
;
420 extern unsigned long get_max_files(void);
421 extern int sysctl_nr_open
;
422 extern struct inodes_stat_t inodes_stat
;
423 extern int leases_enable
, lease_break_time
;
426 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
427 struct buffer_head
*bh_result
, int create
);
428 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
429 ssize_t bytes
, void *private, int ret
,
433 * Attribute flags. These should be or-ed together to figure out what
436 #define ATTR_MODE (1 << 0)
437 #define ATTR_UID (1 << 1)
438 #define ATTR_GID (1 << 2)
439 #define ATTR_SIZE (1 << 3)
440 #define ATTR_ATIME (1 << 4)
441 #define ATTR_MTIME (1 << 5)
442 #define ATTR_CTIME (1 << 6)
443 #define ATTR_ATIME_SET (1 << 7)
444 #define ATTR_MTIME_SET (1 << 8)
445 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
446 #define ATTR_ATTR_FLAG (1 << 10)
447 #define ATTR_KILL_SUID (1 << 11)
448 #define ATTR_KILL_SGID (1 << 12)
449 #define ATTR_FILE (1 << 13)
450 #define ATTR_KILL_PRIV (1 << 14)
451 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
452 #define ATTR_TIMES_SET (1 << 16)
455 * This is the Inode Attributes structure, used for notify_change(). It
456 * uses the above definitions as flags, to know which values have changed.
457 * Also, in this manner, a Filesystem can look at only the values it cares
458 * about. Basically, these are the attributes that the VFS layer can
459 * request to change from the FS layer.
461 * Derek Atkins <warlord@MIT.EDU> 94-10-20
464 unsigned int ia_valid
;
469 struct timespec ia_atime
;
470 struct timespec ia_mtime
;
471 struct timespec ia_ctime
;
474 * Not an attribute, but an auxiliary info for filesystems wanting to
475 * implement an ftruncate() like method. NOTE: filesystem should
476 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
478 struct file
*ia_file
;
482 * Includes for diskquotas.
484 #include <linux/quota.h>
487 * enum positive_aop_returns - aop return codes with specific semantics
489 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
490 * completed, that the page is still locked, and
491 * should be considered active. The VM uses this hint
492 * to return the page to the active list -- it won't
493 * be a candidate for writeback again in the near
494 * future. Other callers must be careful to unlock
495 * the page if they get this return. Returned by
498 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
499 * unlocked it and the page might have been truncated.
500 * The caller should back up to acquiring a new page and
501 * trying again. The aop will be taking reasonable
502 * precautions not to livelock. If the caller held a page
503 * reference, it should drop it before retrying. Returned
506 * address_space_operation functions return these large constants to indicate
507 * special semantics to the caller. These are much larger than the bytes in a
508 * page to allow for functions that return the number of bytes operated on in a
512 enum positive_aop_returns
{
513 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
514 AOP_TRUNCATED_PAGE
= 0x80001,
517 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
518 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
519 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
520 * helper code (eg buffer layer)
521 * to clear GFP_FS from alloc */
524 * oh the beauties of C type declarations.
527 struct address_space
;
528 struct writeback_control
;
531 const struct iovec
*iov
;
532 unsigned long nr_segs
;
537 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
538 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
539 size_t iov_iter_copy_from_user(struct page
*page
,
540 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
541 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
542 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
543 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
545 static inline void iov_iter_init(struct iov_iter
*i
,
546 const struct iovec
*iov
, unsigned long nr_segs
,
547 size_t count
, size_t written
)
550 i
->nr_segs
= nr_segs
;
552 i
->count
= count
+ written
;
554 iov_iter_advance(i
, written
);
557 static inline size_t iov_iter_count(struct iov_iter
*i
)
563 * "descriptor" for what we're up to with a read.
564 * This allows us to use the same read code yet
565 * have multiple different users of the data that
566 * we read from a file.
568 * The simplest case just copies the data to user
581 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
582 unsigned long, unsigned long);
584 struct address_space_operations
{
585 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
586 int (*readpage
)(struct file
*, struct page
*);
588 /* Write back some dirty pages from this mapping. */
589 int (*writepages
)(struct address_space
*, struct writeback_control
*);
591 /* Set a page dirty. Return true if this dirtied it */
592 int (*set_page_dirty
)(struct page
*page
);
594 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
595 struct list_head
*pages
, unsigned nr_pages
);
597 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
598 loff_t pos
, unsigned len
, unsigned flags
,
599 struct page
**pagep
, void **fsdata
);
600 int (*write_end
)(struct file
*, struct address_space
*mapping
,
601 loff_t pos
, unsigned len
, unsigned copied
,
602 struct page
*page
, void *fsdata
);
604 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
605 sector_t (*bmap
)(struct address_space
*, sector_t
);
606 void (*invalidatepage
) (struct page
*, unsigned long);
607 int (*releasepage
) (struct page
*, gfp_t
);
608 void (*freepage
)(struct page
*);
609 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
610 loff_t offset
, unsigned long nr_segs
);
611 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
612 void **, unsigned long *);
613 /* migrate the contents of a page to the specified target */
614 int (*migratepage
) (struct address_space
*,
615 struct page
*, struct page
*);
616 int (*launder_page
) (struct page
*);
617 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
619 int (*error_remove_page
)(struct address_space
*, struct page
*);
622 extern const struct address_space_operations empty_aops
;
625 * pagecache_write_begin/pagecache_write_end must be used by general code
626 * to write into the pagecache.
628 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
629 loff_t pos
, unsigned len
, unsigned flags
,
630 struct page
**pagep
, void **fsdata
);
632 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
633 loff_t pos
, unsigned len
, unsigned copied
,
634 struct page
*page
, void *fsdata
);
636 struct backing_dev_info
;
637 struct address_space
{
638 struct inode
*host
; /* owner: inode, block_device */
639 struct radix_tree_root page_tree
; /* radix tree of all pages */
640 spinlock_t tree_lock
; /* and lock protecting it */
641 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
642 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
643 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
644 struct mutex i_mmap_mutex
; /* protect tree, count, list */
645 /* Protected by tree_lock together with the radix tree */
646 unsigned long nrpages
; /* number of total pages */
647 pgoff_t writeback_index
;/* writeback starts here */
648 const struct address_space_operations
*a_ops
; /* methods */
649 unsigned long flags
; /* error bits/gfp mask */
650 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
651 spinlock_t private_lock
; /* for use by the address_space */
652 struct list_head private_list
; /* ditto */
653 struct address_space
*assoc_mapping
; /* ditto */
654 } __attribute__((aligned(sizeof(long))));
656 * On most architectures that alignment is already the case; but
657 * must be enforced here for CRIS, to let the least significant bit
658 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
661 struct block_device
{
662 dev_t bd_dev
; /* not a kdev_t - it's a search key */
664 struct inode
* bd_inode
; /* will die */
665 struct super_block
* bd_super
;
666 struct mutex bd_mutex
; /* open/close mutex */
667 struct list_head bd_inodes
;
671 bool bd_write_holder
;
673 struct list_head bd_holder_disks
;
675 struct block_device
* bd_contains
;
676 unsigned bd_block_size
;
677 struct hd_struct
* bd_part
;
678 /* number of times partitions within this device have been opened. */
679 unsigned bd_part_count
;
681 struct gendisk
* bd_disk
;
682 struct list_head bd_list
;
684 * Private data. You must have bd_claim'ed the block_device
685 * to use this. NOTE: bd_claim allows an owner to claim
686 * the same device multiple times, the owner must take special
687 * care to not mess up bd_private for that case.
689 unsigned long bd_private
;
691 /* The counter of freeze processes */
692 int bd_fsfreeze_count
;
693 /* Mutex for freeze */
694 struct mutex bd_fsfreeze_mutex
;
698 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
701 #define PAGECACHE_TAG_DIRTY 0
702 #define PAGECACHE_TAG_WRITEBACK 1
703 #define PAGECACHE_TAG_TOWRITE 2
705 int mapping_tagged(struct address_space
*mapping
, int tag
);
708 * Might pages of this file be mapped into userspace?
710 static inline int mapping_mapped(struct address_space
*mapping
)
712 return !prio_tree_empty(&mapping
->i_mmap
) ||
713 !list_empty(&mapping
->i_mmap_nonlinear
);
717 * Might pages of this file have been modified in userspace?
718 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
719 * marks vma as VM_SHARED if it is shared, and the file was opened for
720 * writing i.e. vma may be mprotected writable even if now readonly.
722 static inline int mapping_writably_mapped(struct address_space
*mapping
)
724 return mapping
->i_mmap_writable
!= 0;
728 * Use sequence counter to get consistent i_size on 32-bit processors.
730 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
731 #include <linux/seqlock.h>
732 #define __NEED_I_SIZE_ORDERED
733 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
735 #define i_size_ordered_init(inode) do { } while (0)
739 #define ACL_NOT_CACHED ((void *)(-1))
742 /* RCU path lookup touches following: */
746 const struct inode_operations
*i_op
;
747 struct super_block
*i_sb
;
749 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
750 unsigned int i_flags
;
751 unsigned long i_state
;
752 #ifdef CONFIG_SECURITY
755 struct mutex i_mutex
;
758 unsigned long dirtied_when
; /* jiffies of first dirtying */
760 struct hlist_node i_hash
;
761 struct list_head i_wb_list
; /* backing dev IO list */
762 struct list_head i_lru
; /* inode LRU list */
763 struct list_head i_sb_list
;
765 struct list_head i_dentry
;
766 struct rcu_head i_rcu
;
770 unsigned int i_nlink
;
772 unsigned int i_blkbits
;
775 #ifdef __NEED_I_SIZE_ORDERED
776 seqcount_t i_size_seqcount
;
778 struct timespec i_atime
;
779 struct timespec i_mtime
;
780 struct timespec i_ctime
;
782 unsigned short i_bytes
;
783 atomic_t i_dio_count
;
784 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
785 struct file_lock
*i_flock
;
786 struct address_space
*i_mapping
;
787 struct address_space i_data
;
789 struct dquot
*i_dquot
[MAXQUOTAS
];
791 struct list_head i_devices
;
793 struct pipe_inode_info
*i_pipe
;
794 struct block_device
*i_bdev
;
800 #ifdef CONFIG_FSNOTIFY
801 __u32 i_fsnotify_mask
; /* all events this inode cares about */
802 struct hlist_head i_fsnotify_marks
;
806 atomic_t i_readcount
; /* struct files open RO */
808 atomic_t i_writecount
;
809 #ifdef CONFIG_FS_POSIX_ACL
810 struct posix_acl
*i_acl
;
811 struct posix_acl
*i_default_acl
;
813 void *i_private
; /* fs or device private pointer */
816 static inline int inode_unhashed(struct inode
*inode
)
818 return hlist_unhashed(&inode
->i_hash
);
822 * inode->i_mutex nesting subclasses for the lock validator:
824 * 0: the object of the current VFS operation
829 * The locking order between these classes is
830 * parent -> child -> normal -> xattr -> quota
832 enum inode_i_mutex_lock_class
842 * NOTE: in a 32bit arch with a preemptable kernel and
843 * an UP compile the i_size_read/write must be atomic
844 * with respect to the local cpu (unlike with preempt disabled),
845 * but they don't need to be atomic with respect to other cpus like in
846 * true SMP (so they need either to either locally disable irq around
847 * the read or for example on x86 they can be still implemented as a
848 * cmpxchg8b without the need of the lock prefix). For SMP compiles
849 * and 64bit archs it makes no difference if preempt is enabled or not.
851 static inline loff_t
i_size_read(const struct inode
*inode
)
853 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
858 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
859 i_size
= inode
->i_size
;
860 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
862 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
866 i_size
= inode
->i_size
;
870 return inode
->i_size
;
875 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
876 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
877 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
879 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
881 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
882 write_seqcount_begin(&inode
->i_size_seqcount
);
883 inode
->i_size
= i_size
;
884 write_seqcount_end(&inode
->i_size_seqcount
);
885 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
887 inode
->i_size
= i_size
;
890 inode
->i_size
= i_size
;
894 static inline unsigned iminor(const struct inode
*inode
)
896 return MINOR(inode
->i_rdev
);
899 static inline unsigned imajor(const struct inode
*inode
)
901 return MAJOR(inode
->i_rdev
);
904 extern struct block_device
*I_BDEV(struct inode
*inode
);
907 rwlock_t lock
; /* protects pid, uid, euid fields */
908 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
909 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
910 uid_t uid
, euid
; /* uid/euid of process setting the owner */
911 int signum
; /* posix.1b rt signal to be delivered on IO */
915 * Track a single file's readahead state
917 struct file_ra_state
{
918 pgoff_t start
; /* where readahead started */
919 unsigned int size
; /* # of readahead pages */
920 unsigned int async_size
; /* do asynchronous readahead when
921 there are only # of pages ahead */
923 unsigned int ra_pages
; /* Maximum readahead window */
924 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
925 loff_t prev_pos
; /* Cache last read() position */
929 * Check if @index falls in the readahead windows.
931 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
933 return (index
>= ra
->start
&&
934 index
< ra
->start
+ ra
->size
);
937 #define FILE_MNT_WRITE_TAKEN 1
938 #define FILE_MNT_WRITE_RELEASED 2
942 * fu_list becomes invalid after file_free is called and queued via
943 * fu_rcuhead for RCU freeing
946 struct list_head fu_list
;
947 struct rcu_head fu_rcuhead
;
950 #define f_dentry f_path.dentry
951 #define f_vfsmnt f_path.mnt
952 const struct file_operations
*f_op
;
953 spinlock_t f_lock
; /* f_ep_links, f_flags, no IRQ */
957 atomic_long_t f_count
;
958 unsigned int f_flags
;
961 struct fown_struct f_owner
;
962 const struct cred
*f_cred
;
963 struct file_ra_state f_ra
;
966 #ifdef CONFIG_SECURITY
969 /* needed for tty driver, and maybe others */
973 /* Used by fs/eventpoll.c to link all the hooks to this file */
974 struct list_head f_ep_links
;
975 #endif /* #ifdef CONFIG_EPOLL */
976 struct address_space
*f_mapping
;
977 #ifdef CONFIG_DEBUG_WRITECOUNT
978 unsigned long f_mnt_write_state
;
985 /* file identifier */
986 unsigned char f_handle
[0];
989 #define get_file(x) atomic_long_inc(&(x)->f_count)
990 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
991 #define file_count(x) atomic_long_read(&(x)->f_count)
993 #ifdef CONFIG_DEBUG_WRITECOUNT
994 static inline void file_take_write(struct file
*f
)
996 WARN_ON(f
->f_mnt_write_state
!= 0);
997 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
999 static inline void file_release_write(struct file
*f
)
1001 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
1003 static inline void file_reset_write(struct file
*f
)
1005 f
->f_mnt_write_state
= 0;
1007 static inline void file_check_state(struct file
*f
)
1010 * At this point, either both or neither of these bits
1013 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
1014 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
1016 static inline int file_check_writeable(struct file
*f
)
1018 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
1020 printk(KERN_WARNING
"writeable file with no "
1021 "mnt_want_write()\n");
1025 #else /* !CONFIG_DEBUG_WRITECOUNT */
1026 static inline void file_take_write(struct file
*filp
) {}
1027 static inline void file_release_write(struct file
*filp
) {}
1028 static inline void file_reset_write(struct file
*filp
) {}
1029 static inline void file_check_state(struct file
*filp
) {}
1030 static inline int file_check_writeable(struct file
*filp
)
1034 #endif /* CONFIG_DEBUG_WRITECOUNT */
1036 #define MAX_NON_LFS ((1UL<<31) - 1)
1038 /* Page cache limit. The filesystems should put that into their s_maxbytes
1039 limits, otherwise bad things can happen in VM. */
1040 #if BITS_PER_LONG==32
1041 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1042 #elif BITS_PER_LONG==64
1043 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1048 #define FL_ACCESS 8 /* not trying to lock, just looking */
1049 #define FL_EXISTS 16 /* when unlocking, test for existence */
1050 #define FL_LEASE 32 /* lease held on this file */
1051 #define FL_CLOSE 64 /* unlock on close */
1052 #define FL_SLEEP 128 /* A blocking lock */
1055 * Special return value from posix_lock_file() and vfs_lock_file() for
1056 * asynchronous locking.
1058 #define FILE_LOCK_DEFERRED 1
1061 * The POSIX file lock owner is determined by
1062 * the "struct files_struct" in the thread group
1063 * (or NULL for no owner - BSD locks).
1065 * Lockd stuffs a "host" pointer into this.
1067 typedef struct files_struct
*fl_owner_t
;
1069 struct file_lock_operations
{
1070 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1071 void (*fl_release_private
)(struct file_lock
*);
1074 struct lock_manager_operations
{
1075 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
1076 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
1077 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
1078 void (*lm_release_private
)(struct file_lock
*);
1079 void (*lm_break
)(struct file_lock
*);
1080 int (*lm_change
)(struct file_lock
**, int);
1083 struct lock_manager
{
1084 struct list_head list
;
1087 void locks_start_grace(struct lock_manager
*);
1088 void locks_end_grace(struct lock_manager
*);
1089 int locks_in_grace(void);
1091 /* that will die - we need it for nfs_lock_info */
1092 #include <linux/nfs_fs_i.h>
1095 struct file_lock
*fl_next
; /* singly linked list for this inode */
1096 struct list_head fl_link
; /* doubly linked list of all locks */
1097 struct list_head fl_block
; /* circular list of blocked processes */
1098 fl_owner_t fl_owner
;
1099 unsigned char fl_flags
;
1100 unsigned char fl_type
;
1101 unsigned int fl_pid
;
1102 struct pid
*fl_nspid
;
1103 wait_queue_head_t fl_wait
;
1104 struct file
*fl_file
;
1108 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1109 unsigned long fl_break_time
; /* for nonblocking lease breaks */
1111 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1112 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1114 struct nfs_lock_info nfs_fl
;
1115 struct nfs4_lock_info nfs4_fl
;
1117 struct list_head link
; /* link in AFS vnode's pending_locks list */
1118 int state
; /* state of grant or error if -ve */
1123 /* The following constant reflects the upper bound of the file/locking space */
1125 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1126 #define OFFSET_MAX INT_LIMIT(loff_t)
1127 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1130 #include <linux/fcntl.h>
1132 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1134 #ifdef CONFIG_FILE_LOCKING
1135 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1136 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1137 struct flock __user
*);
1139 #if BITS_PER_LONG == 32
1140 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1141 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1142 struct flock64 __user
*);
1145 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1146 extern int fcntl_getlease(struct file
*filp
);
1149 void locks_free_lock(struct file_lock
*fl
);
1150 extern void locks_init_lock(struct file_lock
*);
1151 extern struct file_lock
* locks_alloc_lock(void);
1152 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1153 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1154 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1155 extern void locks_remove_flock(struct file
*);
1156 extern void locks_release_private(struct file_lock
*);
1157 extern void posix_test_lock(struct file
*, struct file_lock
*);
1158 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1159 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1160 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1161 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1162 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1163 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1164 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1165 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1166 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1167 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1168 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1169 extern int lease_modify(struct file_lock
**, int);
1170 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1171 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1172 extern void lock_flocks(void);
1173 extern void unlock_flocks(void);
1174 #else /* !CONFIG_FILE_LOCKING */
1175 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1180 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1181 unsigned int cmd
, struct flock __user
*user
)
1186 #if BITS_PER_LONG == 32
1187 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1192 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1193 unsigned int cmd
, struct flock64 __user
*user
)
1198 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1203 static inline int fcntl_getlease(struct file
*filp
)
1208 static inline void locks_init_lock(struct file_lock
*fl
)
1213 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1218 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1223 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1228 static inline void locks_remove_flock(struct file
*filp
)
1233 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1238 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1239 struct file_lock
*conflock
)
1244 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1249 static inline int posix_unblock_lock(struct file
*filp
,
1250 struct file_lock
*waiter
)
1255 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1260 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1261 struct file_lock
*fl
, struct file_lock
*conf
)
1266 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1271 static inline int flock_lock_file_wait(struct file
*filp
,
1272 struct file_lock
*request
)
1277 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1282 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1287 static inline int generic_setlease(struct file
*filp
, long arg
,
1288 struct file_lock
**flp
)
1293 static inline int vfs_setlease(struct file
*filp
, long arg
,
1294 struct file_lock
**lease
)
1299 static inline int lease_modify(struct file_lock
**before
, int arg
)
1304 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1310 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1316 static inline void lock_flocks(void)
1320 static inline void unlock_flocks(void)
1324 #endif /* !CONFIG_FILE_LOCKING */
1327 struct fasync_struct
{
1331 struct fasync_struct
*fa_next
; /* singly linked list */
1332 struct file
*fa_file
;
1333 struct rcu_head fa_rcu
;
1336 #define FASYNC_MAGIC 0x4601
1338 /* SMP safe fasync helpers: */
1339 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1340 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1341 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1342 extern struct fasync_struct
*fasync_alloc(void);
1343 extern void fasync_free(struct fasync_struct
*);
1345 /* can be called from interrupts */
1346 extern void kill_fasync(struct fasync_struct
**, int, int);
1348 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1349 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1350 extern void f_delown(struct file
*filp
);
1351 extern pid_t
f_getown(struct file
*filp
);
1352 extern int send_sigurg(struct fown_struct
*fown
);
1358 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1359 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1360 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1361 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1362 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1364 extern struct list_head super_blocks
;
1365 extern spinlock_t sb_lock
;
1367 struct super_block
{
1368 struct list_head s_list
; /* Keep this first */
1369 dev_t s_dev
; /* search index; _not_ kdev_t */
1370 unsigned char s_dirt
;
1371 unsigned char s_blocksize_bits
;
1372 unsigned long s_blocksize
;
1373 loff_t s_maxbytes
; /* Max file size */
1374 struct file_system_type
*s_type
;
1375 const struct super_operations
*s_op
;
1376 const struct dquot_operations
*dq_op
;
1377 const struct quotactl_ops
*s_qcop
;
1378 const struct export_operations
*s_export_op
;
1379 unsigned long s_flags
;
1380 unsigned long s_magic
;
1381 struct dentry
*s_root
;
1382 struct rw_semaphore s_umount
;
1383 struct mutex s_lock
;
1386 #ifdef CONFIG_SECURITY
1389 const struct xattr_handler
**s_xattr
;
1391 struct list_head s_inodes
; /* all inodes */
1392 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1394 struct list_head __percpu
*s_files
;
1396 struct list_head s_files
;
1398 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1399 struct list_head s_dentry_lru
; /* unused dentry lru */
1400 int s_nr_dentry_unused
; /* # of dentry on lru */
1402 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1403 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp
;
1404 struct list_head s_inode_lru
; /* unused inode lru */
1405 int s_nr_inodes_unused
; /* # of inodes on lru */
1407 struct block_device
*s_bdev
;
1408 struct backing_dev_info
*s_bdi
;
1409 struct mtd_info
*s_mtd
;
1410 struct list_head s_instances
;
1411 struct quota_info s_dquot
; /* Diskquota specific options */
1414 wait_queue_head_t s_wait_unfrozen
;
1416 char s_id
[32]; /* Informational name */
1417 u8 s_uuid
[16]; /* UUID */
1419 void *s_fs_info
; /* Filesystem private info */
1422 /* Granularity of c/m/atime in ns.
1423 Cannot be worse than a second */
1427 * The next field is for VFS *only*. No filesystems have any business
1428 * even looking at it. You had been warned.
1430 struct mutex s_vfs_rename_mutex
; /* Kludge */
1433 * Filesystem subtype. If non-empty the filesystem type field
1434 * in /proc/mounts will be "type.subtype"
1439 * Saved mount options for lazy filesystems using
1440 * generic_show_options()
1442 char __rcu
*s_options
;
1443 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1446 * Saved pool identifier for cleancache (-1 means none)
1448 int cleancache_poolid
;
1450 struct shrinker s_shrink
; /* per-sb shrinker handle */
1453 /* superblock cache pruning functions */
1454 extern void prune_icache_sb(struct super_block
*sb
, int nr_to_scan
);
1455 extern void prune_dcache_sb(struct super_block
*sb
, int nr_to_scan
);
1457 extern struct timespec
current_fs_time(struct super_block
*sb
);
1460 * Snapshotting support.
1464 SB_FREEZE_WRITE
= 1,
1465 SB_FREEZE_TRANS
= 2,
1468 #define vfs_check_frozen(sb, level) \
1469 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1472 * until VFS tracks user namespaces for inodes, just make all files
1473 * belong to init_user_ns
1475 extern struct user_namespace init_user_ns
;
1476 #define inode_userns(inode) (&init_user_ns)
1477 extern bool inode_owner_or_capable(const struct inode
*inode
);
1479 /* not quite ready to be deprecated, but... */
1480 extern void lock_super(struct super_block
*);
1481 extern void unlock_super(struct super_block
*);
1484 * VFS helper functions..
1486 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
1487 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
1488 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
1489 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1490 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1491 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1492 extern int vfs_unlink(struct inode
*, struct dentry
*);
1493 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1496 * VFS dentry helper functions.
1498 extern void dentry_unhash(struct dentry
*dentry
);
1501 * VFS file helper functions.
1503 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1506 * VFS FS_IOC_FIEMAP helper definitions.
1508 struct fiemap_extent_info
{
1509 unsigned int fi_flags
; /* Flags as passed from user */
1510 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1511 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1512 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1513 fiemap_extent array */
1515 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1516 u64 phys
, u64 len
, u32 flags
);
1517 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1522 * NOTE! These match bits 12..15 of stat.st_mode
1523 * (ie "(i_mode >> 12) & 15").
1525 #define DT_UNKNOWN 0
1536 * This is the "filldir" function type, used by readdir() to let
1537 * the kernel specify what kind of dirent layout it wants to have.
1538 * This allows the kernel to read directories into kernel space or
1539 * to have different dirent layouts depending on the binary type.
1541 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1542 struct block_device_operations
;
1544 /* These macros are for out of kernel modules to test that
1545 * the kernel supports the unlocked_ioctl and compat_ioctl
1546 * fields in struct file_operations. */
1547 #define HAVE_COMPAT_IOCTL 1
1548 #define HAVE_UNLOCKED_IOCTL 1
1550 struct file_operations
{
1551 struct module
*owner
;
1552 loff_t (*llseek
) (struct file
*, loff_t
, int);
1553 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1554 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1555 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1556 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1557 int (*readdir
) (struct file
*, void *, filldir_t
);
1558 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1559 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1560 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1561 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1562 int (*open
) (struct inode
*, struct file
*);
1563 int (*flush
) (struct file
*, fl_owner_t id
);
1564 int (*release
) (struct inode
*, struct file
*);
1565 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1566 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1567 int (*fasync
) (int, struct file
*, int);
1568 int (*lock
) (struct file
*, int, struct file_lock
*);
1569 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1570 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1571 int (*check_flags
)(int);
1572 int (*flock
) (struct file
*, int, struct file_lock
*);
1573 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1574 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1575 int (*setlease
)(struct file
*, long, struct file_lock
**);
1576 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1580 struct inode_operations
{
1581 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1582 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1583 int (*permission
) (struct inode
*, int);
1584 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1586 int (*readlink
) (struct dentry
*, char __user
*,int);
1587 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1589 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1590 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1591 int (*unlink
) (struct inode
*,struct dentry
*);
1592 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1593 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1594 int (*rmdir
) (struct inode
*,struct dentry
*);
1595 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1596 int (*rename
) (struct inode
*, struct dentry
*,
1597 struct inode
*, struct dentry
*);
1598 void (*truncate
) (struct inode
*);
1599 int (*setattr
) (struct dentry
*, struct iattr
*);
1600 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1601 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1602 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1603 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1604 int (*removexattr
) (struct dentry
*, const char *);
1605 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1606 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1608 } ____cacheline_aligned
;
1612 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1613 unsigned long nr_segs
, unsigned long fast_segs
,
1614 struct iovec
*fast_pointer
,
1615 struct iovec
**ret_pointer
);
1617 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1618 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1619 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1620 unsigned long, loff_t
*);
1621 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1622 unsigned long, loff_t
*);
1624 struct super_operations
{
1625 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1626 void (*destroy_inode
)(struct inode
*);
1628 void (*dirty_inode
) (struct inode
*, int flags
);
1629 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1630 int (*drop_inode
) (struct inode
*);
1631 void (*evict_inode
) (struct inode
*);
1632 void (*put_super
) (struct super_block
*);
1633 void (*write_super
) (struct super_block
*);
1634 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1635 int (*freeze_fs
) (struct super_block
*);
1636 int (*unfreeze_fs
) (struct super_block
*);
1637 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1638 int (*remount_fs
) (struct super_block
*, int *, char *);
1639 void (*umount_begin
) (struct super_block
*);
1641 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1642 int (*show_devname
)(struct seq_file
*, struct vfsmount
*);
1643 int (*show_path
)(struct seq_file
*, struct vfsmount
*);
1644 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1646 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1647 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1649 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1650 int (*nr_cached_objects
)(struct super_block
*);
1651 void (*free_cached_objects
)(struct super_block
*, int);
1655 * Inode state bits. Protected by inode->i_lock
1657 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1658 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1660 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1661 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1662 * various stages of removing an inode.
1664 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1666 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1667 * fdatasync(). i_atime is the usual cause.
1668 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1669 * these changes separately from I_DIRTY_SYNC so that we
1670 * don't have to write inode on fdatasync() when only
1671 * mtime has changed in it.
1672 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1673 * I_NEW Serves as both a mutex and completion notification.
1674 * New inodes set I_NEW. If two processes both create
1675 * the same inode, one of them will release its inode and
1676 * wait for I_NEW to be released before returning.
1677 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1678 * also cause waiting on I_NEW, without I_NEW actually
1679 * being set. find_inode() uses this to prevent returning
1680 * nearly-dead inodes.
1681 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1682 * is zero. I_FREEING must be set when I_WILL_FREE is
1684 * I_FREEING Set when inode is about to be freed but still has dirty
1685 * pages or buffers attached or the inode itself is still
1687 * I_CLEAR Added by end_writeback(). In this state the inode is clean
1688 * and can be destroyed. Inode keeps I_FREEING.
1690 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1691 * prohibited for many purposes. iget() must wait for
1692 * the inode to be completely released, then create it
1693 * anew. Other functions will just ignore such inodes,
1694 * if appropriate. I_NEW is used for waiting.
1696 * I_SYNC Synchonized write of dirty inode data. The bits is
1697 * set during data writeback, and cleared with a wakeup
1698 * on the bit address once it is done.
1700 * I_REFERENCED Marks the inode as recently references on the LRU list.
1702 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1704 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1706 #define I_DIRTY_SYNC (1 << 0)
1707 #define I_DIRTY_DATASYNC (1 << 1)
1708 #define I_DIRTY_PAGES (1 << 2)
1710 #define I_NEW (1 << __I_NEW)
1711 #define I_WILL_FREE (1 << 4)
1712 #define I_FREEING (1 << 5)
1713 #define I_CLEAR (1 << 6)
1715 #define I_SYNC (1 << __I_SYNC)
1716 #define I_REFERENCED (1 << 8)
1717 #define __I_DIO_WAKEUP 9
1718 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1720 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1722 extern void __mark_inode_dirty(struct inode
*, int);
1723 static inline void mark_inode_dirty(struct inode
*inode
)
1725 __mark_inode_dirty(inode
, I_DIRTY
);
1728 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1730 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1734 * inc_nlink - directly increment an inode's link count
1737 * This is a low-level filesystem helper to replace any
1738 * direct filesystem manipulation of i_nlink. Currently,
1739 * it is only here for parity with dec_nlink().
1741 static inline void inc_nlink(struct inode
*inode
)
1746 static inline void inode_inc_link_count(struct inode
*inode
)
1749 mark_inode_dirty(inode
);
1753 * drop_nlink - directly drop an inode's link count
1756 * This is a low-level filesystem helper to replace any
1757 * direct filesystem manipulation of i_nlink. In cases
1758 * where we are attempting to track writes to the
1759 * filesystem, a decrement to zero means an imminent
1760 * write when the file is truncated and actually unlinked
1761 * on the filesystem.
1763 static inline void drop_nlink(struct inode
*inode
)
1769 * clear_nlink - directly zero an inode's link count
1772 * This is a low-level filesystem helper to replace any
1773 * direct filesystem manipulation of i_nlink. See
1774 * drop_nlink() for why we care about i_nlink hitting zero.
1776 static inline void clear_nlink(struct inode
*inode
)
1781 static inline void inode_dec_link_count(struct inode
*inode
)
1784 mark_inode_dirty(inode
);
1788 * inode_inc_iversion - increments i_version
1789 * @inode: inode that need to be updated
1791 * Every time the inode is modified, the i_version field will be incremented.
1792 * The filesystem has to be mounted with i_version flag
1795 static inline void inode_inc_iversion(struct inode
*inode
)
1797 spin_lock(&inode
->i_lock
);
1799 spin_unlock(&inode
->i_lock
);
1802 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1803 static inline void file_accessed(struct file
*file
)
1805 if (!(file
->f_flags
& O_NOATIME
))
1806 touch_atime(file
->f_path
.mnt
, file
->f_path
.dentry
);
1809 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1810 int sync_inode_metadata(struct inode
*inode
, int wait
);
1812 struct file_system_type
{
1815 struct dentry
*(*mount
) (struct file_system_type
*, int,
1816 const char *, void *);
1817 void (*kill_sb
) (struct super_block
*);
1818 struct module
*owner
;
1819 struct file_system_type
* next
;
1820 struct list_head fs_supers
;
1822 struct lock_class_key s_lock_key
;
1823 struct lock_class_key s_umount_key
;
1824 struct lock_class_key s_vfs_rename_key
;
1826 struct lock_class_key i_lock_key
;
1827 struct lock_class_key i_mutex_key
;
1828 struct lock_class_key i_mutex_dir_key
;
1831 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1832 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1833 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1834 int flags
, const char *dev_name
, void *data
,
1835 int (*fill_super
)(struct super_block
*, void *, int));
1836 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1837 int flags
, void *data
,
1838 int (*fill_super
)(struct super_block
*, void *, int));
1839 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1840 int flags
, void *data
,
1841 int (*fill_super
)(struct super_block
*, void *, int));
1842 void generic_shutdown_super(struct super_block
*sb
);
1843 void kill_block_super(struct super_block
*sb
);
1844 void kill_anon_super(struct super_block
*sb
);
1845 void kill_litter_super(struct super_block
*sb
);
1846 void deactivate_super(struct super_block
*sb
);
1847 void deactivate_locked_super(struct super_block
*sb
);
1848 int set_anon_super(struct super_block
*s
, void *data
);
1849 int get_anon_bdev(dev_t
*);
1850 void free_anon_bdev(dev_t
);
1851 struct super_block
*sget(struct file_system_type
*type
,
1852 int (*test
)(struct super_block
*,void *),
1853 int (*set
)(struct super_block
*,void *),
1855 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1856 const struct super_operations
*ops
,
1857 const struct dentry_operations
*dops
,
1860 static inline void sb_mark_dirty(struct super_block
*sb
)
1864 static inline void sb_mark_clean(struct super_block
*sb
)
1868 static inline int sb_is_dirty(struct super_block
*sb
)
1873 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1874 #define fops_get(fops) \
1875 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1876 #define fops_put(fops) \
1877 do { if (fops) module_put((fops)->owner); } while(0)
1879 extern int register_filesystem(struct file_system_type
*);
1880 extern int unregister_filesystem(struct file_system_type
*);
1881 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1882 #define kern_mount(type) kern_mount_data(type, NULL)
1883 extern void kern_unmount(struct vfsmount
*mnt
);
1884 extern int may_umount_tree(struct vfsmount
*);
1885 extern int may_umount(struct vfsmount
*);
1886 extern long do_mount(char *, char *, char *, unsigned long, void *);
1887 extern struct vfsmount
*collect_mounts(struct path
*);
1888 extern void drop_collected_mounts(struct vfsmount
*);
1889 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1891 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1892 extern int user_statfs(const char __user
*, struct kstatfs
*);
1893 extern int fd_statfs(int, struct kstatfs
*);
1894 extern int statfs_by_dentry(struct dentry
*, struct kstatfs
*);
1895 extern int freeze_super(struct super_block
*super
);
1896 extern int thaw_super(struct super_block
*super
);
1898 extern int current_umask(void);
1901 extern struct kobject
*fs_kobj
;
1903 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1904 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1906 #define FLOCK_VERIFY_READ 1
1907 #define FLOCK_VERIFY_WRITE 2
1909 #ifdef CONFIG_FILE_LOCKING
1910 extern int locks_mandatory_locked(struct inode
*);
1911 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1914 * Candidates for mandatory locking have the setgid bit set
1915 * but no group execute bit - an otherwise meaningless combination.
1918 static inline int __mandatory_lock(struct inode
*ino
)
1920 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1924 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1925 * otherwise these will be advisory locks
1928 static inline int mandatory_lock(struct inode
*ino
)
1930 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1933 static inline int locks_verify_locked(struct inode
*inode
)
1935 if (mandatory_lock(inode
))
1936 return locks_mandatory_locked(inode
);
1940 static inline int locks_verify_truncate(struct inode
*inode
,
1944 if (inode
->i_flock
&& mandatory_lock(inode
))
1945 return locks_mandatory_area(
1946 FLOCK_VERIFY_WRITE
, inode
, filp
,
1947 size
< inode
->i_size
? size
: inode
->i_size
,
1948 (size
< inode
->i_size
? inode
->i_size
- size
1949 : size
- inode
->i_size
)
1954 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1957 return __break_lease(inode
, mode
);
1960 #else /* !CONFIG_FILE_LOCKING */
1961 static inline int locks_mandatory_locked(struct inode
*inode
)
1966 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
1967 struct file
*filp
, loff_t offset
,
1973 static inline int __mandatory_lock(struct inode
*inode
)
1978 static inline int mandatory_lock(struct inode
*inode
)
1983 static inline int locks_verify_locked(struct inode
*inode
)
1988 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
1994 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1999 #endif /* CONFIG_FILE_LOCKING */
2003 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2005 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2007 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2009 extern struct file
*filp_open(const char *, int, int);
2010 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2012 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int,
2013 const struct cred
*);
2014 extern int filp_close(struct file
*, fl_owner_t id
);
2015 extern char * getname(const char __user
*);
2019 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2022 extern void __init
vfs_caches_init_early(void);
2023 extern void __init
vfs_caches_init(unsigned long);
2025 extern struct kmem_cache
*names_cachep
;
2027 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2028 #define __getname() __getname_gfp(GFP_KERNEL)
2029 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2030 #ifndef CONFIG_AUDITSYSCALL
2031 #define putname(name) __putname(name)
2033 extern void putname(const char *name
);
2037 extern int register_blkdev(unsigned int, const char *);
2038 extern void unregister_blkdev(unsigned int, const char *);
2039 extern struct block_device
*bdget(dev_t
);
2040 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2041 extern void bd_set_size(struct block_device
*, loff_t size
);
2042 extern void bd_forget(struct inode
*inode
);
2043 extern void bdput(struct block_device
*);
2044 extern void invalidate_bdev(struct block_device
*);
2045 extern int sync_blockdev(struct block_device
*bdev
);
2046 extern struct super_block
*freeze_bdev(struct block_device
*);
2047 extern void emergency_thaw_all(void);
2048 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2049 extern int fsync_bdev(struct block_device
*);
2051 static inline void bd_forget(struct inode
*inode
) {}
2052 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2053 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2055 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2060 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2065 extern int sync_filesystem(struct super_block
*);
2066 extern const struct file_operations def_blk_fops
;
2067 extern const struct file_operations def_chr_fops
;
2068 extern const struct file_operations bad_sock_fops
;
2069 extern const struct file_operations def_fifo_fops
;
2071 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2072 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2073 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2074 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2075 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2077 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2079 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2081 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2082 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2083 struct gendisk
*disk
);
2085 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2086 struct gendisk
*disk
)
2090 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2091 struct gendisk
*disk
)
2098 #define CHRDEV_MAJOR_HASH_SIZE 255
2099 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2100 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2101 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2102 unsigned int count
, const char *name
,
2103 const struct file_operations
*fops
);
2104 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2105 unsigned int count
, const char *name
);
2106 extern void unregister_chrdev_region(dev_t
, unsigned);
2107 extern void chrdev_show(struct seq_file
*,off_t
);
2109 static inline int register_chrdev(unsigned int major
, const char *name
,
2110 const struct file_operations
*fops
)
2112 return __register_chrdev(major
, 0, 256, name
, fops
);
2115 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2117 __unregister_chrdev(major
, 0, 256, name
);
2120 /* fs/block_dev.c */
2121 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2122 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2125 #define BLKDEV_MAJOR_HASH_SIZE 255
2126 extern const char *__bdevname(dev_t
, char *buffer
);
2127 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2128 extern struct block_device
*lookup_bdev(const char *);
2129 extern void blkdev_show(struct seq_file
*,off_t
);
2132 #define BLKDEV_MAJOR_HASH_SIZE 0
2135 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2137 /* Invalid inode operations -- fs/bad_inode.c */
2138 extern void make_bad_inode(struct inode
*);
2139 extern int is_bad_inode(struct inode
*);
2141 extern const struct file_operations read_pipefifo_fops
;
2142 extern const struct file_operations write_pipefifo_fops
;
2143 extern const struct file_operations rdwr_pipefifo_fops
;
2145 extern int fs_may_remount_ro(struct super_block
*);
2149 * return READ, READA, or WRITE
2151 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2154 * return data direction, READ or WRITE
2156 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2158 extern void check_disk_size_change(struct gendisk
*disk
,
2159 struct block_device
*bdev
);
2160 extern int revalidate_disk(struct gendisk
*);
2161 extern int check_disk_change(struct block_device
*);
2162 extern int __invalidate_device(struct block_device
*, bool);
2163 extern int invalidate_partition(struct gendisk
*, int);
2165 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2166 pgoff_t start
, pgoff_t end
);
2168 static inline void invalidate_remote_inode(struct inode
*inode
)
2170 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2171 S_ISLNK(inode
->i_mode
))
2172 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2174 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2175 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2176 pgoff_t start
, pgoff_t end
);
2177 extern int write_inode_now(struct inode
*, int);
2178 extern int filemap_fdatawrite(struct address_space
*);
2179 extern int filemap_flush(struct address_space
*);
2180 extern int filemap_fdatawait(struct address_space
*);
2181 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2183 extern int filemap_write_and_wait(struct address_space
*mapping
);
2184 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2185 loff_t lstart
, loff_t lend
);
2186 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2187 loff_t start
, loff_t end
, int sync_mode
);
2188 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2189 loff_t start
, loff_t end
);
2191 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2193 extern int vfs_fsync(struct file
*file
, int datasync
);
2194 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2195 extern void sync_supers(void);
2196 extern void emergency_sync(void);
2197 extern void emergency_remount(void);
2199 extern sector_t
bmap(struct inode
*, sector_t
);
2201 extern int notify_change(struct dentry
*, struct iattr
*);
2202 extern int inode_permission(struct inode
*, int);
2203 extern int generic_permission(struct inode
*, int);
2205 static inline bool execute_ok(struct inode
*inode
)
2207 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2211 * get_write_access() gets write permission for a file.
2212 * put_write_access() releases this write permission.
2213 * This is used for regular files.
2214 * We cannot support write (and maybe mmap read-write shared) accesses and
2215 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2216 * can have the following values:
2217 * 0: no writers, no VM_DENYWRITE mappings
2218 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2219 * > 0: (i_writecount) users are writing to the file.
2221 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2222 * except for the cases where we don't hold i_writecount yet. Then we need to
2223 * use {get,deny}_write_access() - these functions check the sign and refuse
2224 * to do the change if sign is wrong.
2226 static inline int get_write_access(struct inode
*inode
)
2228 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2230 static inline int deny_write_access(struct file
*file
)
2232 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2233 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2235 static inline void put_write_access(struct inode
* inode
)
2237 atomic_dec(&inode
->i_writecount
);
2239 static inline void allow_write_access(struct file
*file
)
2242 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2245 static inline void i_readcount_dec(struct inode
*inode
)
2247 BUG_ON(!atomic_read(&inode
->i_readcount
));
2248 atomic_dec(&inode
->i_readcount
);
2250 static inline void i_readcount_inc(struct inode
*inode
)
2252 atomic_inc(&inode
->i_readcount
);
2255 static inline void i_readcount_dec(struct inode
*inode
)
2259 static inline void i_readcount_inc(struct inode
*inode
)
2264 extern int do_pipe_flags(int *, int);
2265 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
2266 extern struct file
*create_write_pipe(int flags
);
2267 extern void free_write_pipe(struct file
*);
2269 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2270 extern struct file
* open_exec(const char *);
2272 /* fs/dcache.c -- generic fs support functions */
2273 extern int is_subdir(struct dentry
*, struct dentry
*);
2274 extern int path_is_under(struct path
*, struct path
*);
2275 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2277 #include <linux/err.h>
2279 /* needed for stackable file system support */
2280 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2282 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2284 extern int inode_init_always(struct super_block
*, struct inode
*);
2285 extern void inode_init_once(struct inode
*);
2286 extern void address_space_init_once(struct address_space
*mapping
);
2287 extern void ihold(struct inode
* inode
);
2288 extern void iput(struct inode
*);
2289 extern struct inode
* igrab(struct inode
*);
2290 extern ino_t
iunique(struct super_block
*, ino_t
);
2291 extern int inode_needs_sync(struct inode
*inode
);
2292 extern int generic_delete_inode(struct inode
*inode
);
2293 extern int generic_drop_inode(struct inode
*inode
);
2295 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2296 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2298 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2299 int (*test
)(struct inode
*, void *), void *data
);
2300 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2302 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2303 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2304 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2305 extern int insert_inode_locked(struct inode
*);
2306 extern void unlock_new_inode(struct inode
*);
2307 extern unsigned int get_next_ino(void);
2309 extern void __iget(struct inode
* inode
);
2310 extern void iget_failed(struct inode
*);
2311 extern void end_writeback(struct inode
*);
2312 extern void __destroy_inode(struct inode
*);
2313 extern struct inode
*new_inode(struct super_block
*);
2314 extern void free_inode_nonrcu(struct inode
*inode
);
2315 extern int should_remove_suid(struct dentry
*);
2316 extern int file_remove_suid(struct file
*);
2318 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2319 extern void remove_inode_hash(struct inode
*);
2320 static inline void insert_inode_hash(struct inode
*inode
)
2322 __insert_inode_hash(inode
, inode
->i_ino
);
2324 extern void inode_sb_list_add(struct inode
*inode
);
2327 extern void submit_bio(int, struct bio
*);
2328 extern int bdev_read_only(struct block_device
*);
2330 extern int set_blocksize(struct block_device
*, int);
2331 extern int sb_set_blocksize(struct super_block
*, int);
2332 extern int sb_min_blocksize(struct super_block
*, int);
2334 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2335 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2336 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2337 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2338 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2339 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2341 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2342 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2343 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2344 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2345 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2346 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2347 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2348 extern int generic_segment_checks(const struct iovec
*iov
,
2349 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2351 /* fs/block_dev.c */
2352 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2353 unsigned long nr_segs
, loff_t pos
);
2354 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2358 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2359 struct pipe_inode_info
*, size_t, unsigned int);
2360 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2361 struct pipe_inode_info
*, size_t, unsigned int);
2362 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2363 struct file
*, loff_t
*, size_t, unsigned int);
2364 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2365 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2366 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2367 size_t len
, unsigned int flags
);
2370 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2371 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2372 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2373 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2374 extern loff_t
generic_file_llseek_unlocked(struct file
*file
, loff_t offset
,
2376 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2377 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2379 #ifdef CONFIG_FS_XIP
2380 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2382 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2383 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2384 size_t len
, loff_t
*ppos
);
2385 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2387 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2394 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2395 loff_t file_offset
);
2398 /* need locking between buffered and direct access */
2401 /* filesystem does not support filling holes */
2402 DIO_SKIP_HOLES
= 0x02,
2405 void dio_end_io(struct bio
*bio
, int error
);
2406 void inode_dio_wait(struct inode
*inode
);
2407 void inode_dio_done(struct inode
*inode
);
2409 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2410 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2411 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2412 dio_submit_t submit_io
, int flags
);
2414 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2415 struct inode
*inode
, const struct iovec
*iov
, loff_t offset
,
2416 unsigned long nr_segs
, get_block_t get_block
)
2418 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2419 offset
, nr_segs
, get_block
, NULL
, NULL
,
2420 DIO_LOCKING
| DIO_SKIP_HOLES
);
2423 static inline void inode_dio_wait(struct inode
*inode
)
2428 extern const struct file_operations generic_ro_fops
;
2430 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2432 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2433 extern int vfs_follow_link(struct nameidata
*, const char *);
2434 extern int page_readlink(struct dentry
*, char __user
*, int);
2435 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2436 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2437 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2439 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2440 extern const struct inode_operations page_symlink_inode_operations
;
2441 extern int generic_readlink(struct dentry
*, char __user
*, int);
2442 extern void generic_fillattr(struct inode
*, struct kstat
*);
2443 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2444 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2445 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2446 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2447 loff_t
inode_get_bytes(struct inode
*inode
);
2448 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2450 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2452 extern int vfs_stat(const char __user
*, struct kstat
*);
2453 extern int vfs_lstat(const char __user
*, struct kstat
*);
2454 extern int vfs_fstat(unsigned int, struct kstat
*);
2455 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2457 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2459 extern int __generic_block_fiemap(struct inode
*inode
,
2460 struct fiemap_extent_info
*fieinfo
,
2461 loff_t start
, loff_t len
,
2462 get_block_t
*get_block
);
2463 extern int generic_block_fiemap(struct inode
*inode
,
2464 struct fiemap_extent_info
*fieinfo
, u64 start
,
2465 u64 len
, get_block_t
*get_block
);
2467 extern void get_filesystem(struct file_system_type
*fs
);
2468 extern void put_filesystem(struct file_system_type
*fs
);
2469 extern struct file_system_type
*get_fs_type(const char *name
);
2470 extern struct super_block
*get_super(struct block_device
*);
2471 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2472 extern struct super_block
*user_get_super(dev_t
);
2473 extern void drop_super(struct super_block
*sb
);
2474 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2475 extern void iterate_supers_type(struct file_system_type
*,
2476 void (*)(struct super_block
*, void *), void *);
2478 extern int dcache_dir_open(struct inode
*, struct file
*);
2479 extern int dcache_dir_close(struct inode
*, struct file
*);
2480 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2481 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2482 extern int simple_setattr(struct dentry
*, struct iattr
*);
2483 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2484 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2485 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2486 extern int simple_unlink(struct inode
*, struct dentry
*);
2487 extern int simple_rmdir(struct inode
*, struct dentry
*);
2488 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2489 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2490 extern int simple_empty(struct dentry
*);
2491 extern int simple_readpage(struct file
*file
, struct page
*page
);
2492 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2493 loff_t pos
, unsigned len
, unsigned flags
,
2494 struct page
**pagep
, void **fsdata
);
2495 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2496 loff_t pos
, unsigned len
, unsigned copied
,
2497 struct page
*page
, void *fsdata
);
2499 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2500 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2501 extern const struct file_operations simple_dir_operations
;
2502 extern const struct inode_operations simple_dir_inode_operations
;
2503 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2504 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2505 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2506 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2507 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2509 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2510 loff_t
*ppos
, const void *from
, size_t available
);
2511 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2512 const void __user
*from
, size_t count
);
2514 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2516 extern int generic_check_addressable(unsigned, u64
);
2518 #ifdef CONFIG_MIGRATION
2519 extern int buffer_migrate_page(struct address_space
*,
2520 struct page
*, struct page
*);
2522 #define buffer_migrate_page NULL
2525 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2526 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2527 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2529 extern void file_update_time(struct file
*file
);
2531 extern int generic_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
2532 extern void save_mount_options(struct super_block
*sb
, char *options
);
2533 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2535 static inline ino_t
parent_ino(struct dentry
*dentry
)
2540 * Don't strictly need d_lock here? If the parent ino could change
2541 * then surely we'd have a deeper race in the caller?
2543 spin_lock(&dentry
->d_lock
);
2544 res
= dentry
->d_parent
->d_inode
->i_ino
;
2545 spin_unlock(&dentry
->d_lock
);
2549 /* Transaction based IO helpers */
2552 * An argresp is stored in an allocated page and holds the
2553 * size of the argument or response, along with its content
2555 struct simple_transaction_argresp
{
2560 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2562 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2564 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2565 size_t size
, loff_t
*pos
);
2566 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2568 void simple_transaction_set(struct file
*file
, size_t n
);
2571 * simple attribute files
2573 * These attributes behave similar to those in sysfs:
2575 * Writing to an attribute immediately sets a value, an open file can be
2576 * written to multiple times.
2578 * Reading from an attribute creates a buffer from the value that might get
2579 * read with multiple read calls. When the attribute has been read
2580 * completely, no further read calls are possible until the file is opened
2583 * All attributes contain a text representation of a numeric value
2584 * that are accessed with the get() and set() functions.
2586 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2587 static int __fops ## _open(struct inode *inode, struct file *file) \
2589 __simple_attr_check_format(__fmt, 0ull); \
2590 return simple_attr_open(inode, file, __get, __set, __fmt); \
2592 static const struct file_operations __fops = { \
2593 .owner = THIS_MODULE, \
2594 .open = __fops ## _open, \
2595 .release = simple_attr_release, \
2596 .read = simple_attr_read, \
2597 .write = simple_attr_write, \
2598 .llseek = generic_file_llseek, \
2601 static inline void __attribute__((format(printf
, 1, 2)))
2602 __simple_attr_check_format(const char *fmt
, ...)
2604 /* don't do anything, just let the compiler check the arguments; */
2607 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2608 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2610 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2611 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2612 size_t len
, loff_t
*ppos
);
2613 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2614 size_t len
, loff_t
*ppos
);
2617 int proc_nr_files(struct ctl_table
*table
, int write
,
2618 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2619 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2620 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2621 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2622 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2623 int __init
get_filesystem_list(char *buf
);
2625 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2626 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2628 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2629 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2630 (flag & __FMODE_NONOTIFY)))
2632 static inline int is_sxid(mode_t mode
)
2634 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2637 static inline void inode_has_no_xattr(struct inode
*inode
)
2639 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2640 inode
->i_flags
|= S_NOSEC
;
2643 #endif /* __KERNEL__ */
2644 #endif /* _LINUX_FS_H */