5 * This file has definitions for some important file table
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
11 #include <linux/blk_types.h>
12 #include <linux/types.h>
15 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
16 * the file limit at runtime and only root can increase the per-process
17 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
18 * upper limit on files-per-process.
20 * Some programs (notably those using select()) may have to be
21 * recompiled to take full advantage of the new limits..
24 /* Fixed constants first: */
26 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */
27 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
29 #define BLOCK_SIZE_BITS 10
30 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
32 #define SEEK_SET 0 /* seek relative to beginning of file */
33 #define SEEK_CUR 1 /* seek relative to current file position */
34 #define SEEK_END 2 /* seek relative to end of file */
35 #define SEEK_DATA 3 /* seek to the next data */
36 #define SEEK_HOLE 4 /* seek to the next hole */
37 #define SEEK_MAX SEEK_HOLE
45 /* And dynamically-tunable limits and defaults: */
46 struct files_stat_struct {
47 unsigned long nr_files; /* read only */
48 unsigned long nr_free_files; /* read only */
49 unsigned long max_files; /* tunable */
52 struct inodes_stat_t {
55 int dummy[5]; /* padding for sysctl ABI compatibility */
59 #define NR_FILE 8192 /* this can well be larger on a larger system */
61 #define MAY_EXEC 0x00000001
62 #define MAY_WRITE 0x00000002
63 #define MAY_READ 0x00000004
64 #define MAY_APPEND 0x00000008
65 #define MAY_ACCESS 0x00000010
66 #define MAY_OPEN 0x00000020
67 #define MAY_CHDIR 0x00000040
68 /* called from RCU mode, don't block */
69 #define MAY_NOT_BLOCK 0x00000080
72 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
73 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
76 /* file is open for reading */
77 #define FMODE_READ ((__force fmode_t)0x1)
78 /* file is open for writing */
79 #define FMODE_WRITE ((__force fmode_t)0x2)
80 /* file is seekable */
81 #define FMODE_LSEEK ((__force fmode_t)0x4)
82 /* file can be accessed using pread */
83 #define FMODE_PREAD ((__force fmode_t)0x8)
84 /* file can be accessed using pwrite */
85 #define FMODE_PWRITE ((__force fmode_t)0x10)
86 /* File is opened for execution with sys_execve / sys_uselib */
87 #define FMODE_EXEC ((__force fmode_t)0x20)
88 /* File is opened with O_NDELAY (only set for block devices) */
89 #define FMODE_NDELAY ((__force fmode_t)0x40)
90 /* File is opened with O_EXCL (only set for block devices) */
91 #define FMODE_EXCL ((__force fmode_t)0x80)
92 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
93 (specialy hack for floppy.c) */
94 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
95 /* 32bit hashes as llseek() offset (for directories) */
96 #define FMODE_32BITHASH ((__force fmode_t)0x200)
97 /* 64bit hashes as llseek() offset (for directories) */
98 #define FMODE_64BITHASH ((__force fmode_t)0x400)
101 * Don't update ctime and mtime.
103 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
104 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
106 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
108 /* Expect random access pattern */
109 #define FMODE_RANDOM ((__force fmode_t)0x1000)
111 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
112 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
114 /* File is opened with O_PATH; almost nothing can be done with it */
115 #define FMODE_PATH ((__force fmode_t)0x4000)
117 /* File was opened by fanotify and shouldn't generate fanotify events */
118 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
121 * The below are the various read and write types that we support. Some of
122 * them include behavioral modifiers that send information down to the
123 * block layer and IO scheduler. Terminology:
125 * The block layer uses device plugging to defer IO a little bit, in
126 * the hope that we will see more IO very shortly. This increases
127 * coalescing of adjacent IO and thus reduces the number of IOs we
128 * have to send to the device. It also allows for better queuing,
129 * if the IO isn't mergeable. If the caller is going to be waiting
130 * for the IO, then he must ensure that the device is unplugged so
131 * that the IO is dispatched to the driver.
133 * All IO is handled async in Linux. This is fine for background
134 * writes, but for reads or writes that someone waits for completion
135 * on, we want to notify the block layer and IO scheduler so that they
136 * know about it. That allows them to make better scheduling
137 * decisions. So when the below references 'sync' and 'async', it
138 * is referencing this priority hint.
140 * With that in mind, the available types are:
142 * READ A normal read operation. Device will be plugged.
143 * READ_SYNC A synchronous read. Device is not plugged, caller can
144 * immediately wait on this read without caring about
146 * READA Used for read-ahead operations. Lower priority, and the
147 * block layer could (in theory) choose to ignore this
148 * request if it runs into resource problems.
149 * WRITE A normal async write. Device will be plugged.
150 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
151 * the hint that someone will be waiting on this IO
152 * shortly. The write equivalent of READ_SYNC.
153 * WRITE_ODIRECT Special case write for O_DIRECT only.
154 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
155 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
156 * non-volatile media on completion.
157 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
158 * by a cache flush and data is guaranteed to be on
159 * non-volatile media on completion.
162 #define RW_MASK REQ_WRITE
163 #define RWA_MASK REQ_RAHEAD
166 #define WRITE RW_MASK
167 #define READA RWA_MASK
168 #define KERNEL_READ (READ|REQ_KERNEL)
169 #define KERNEL_WRITE (WRITE|REQ_KERNEL)
171 #define READ_SYNC (READ | REQ_SYNC)
172 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
173 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
174 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
175 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
176 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
180 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
181 * that indicates that they should check the contents of the iovec are
182 * valid, but not check the memory that the iovec elements
185 #define CHECK_IOVEC_ONLY -1
191 /* public flags for file_system_type */
192 #define FS_REQUIRES_DEV 1
193 #define FS_BINARY_MOUNTDATA 2
194 #define FS_HAS_SUBTYPE 4
195 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
196 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
197 * during rename() internally.
201 * These are the fs-independent mount-flags: up to 32 flags are supported
203 #define MS_RDONLY 1 /* Mount read-only */
204 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
205 #define MS_NODEV 4 /* Disallow access to device special files */
206 #define MS_NOEXEC 8 /* Disallow program execution */
207 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
208 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
209 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
210 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
211 #define MS_NOATIME 1024 /* Do not update access times. */
212 #define MS_NODIRATIME 2048 /* Do not update directory access times */
216 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
217 MS_VERBOSE is deprecated. */
218 #define MS_SILENT 32768
219 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
220 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
221 #define MS_PRIVATE (1<<18) /* change to private */
222 #define MS_SLAVE (1<<19) /* change to slave */
223 #define MS_SHARED (1<<20) /* change to shared */
224 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
225 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
226 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
227 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
228 #define MS_NOSEC (1<<28)
229 #define MS_BORN (1<<29)
230 #define MS_ACTIVE (1<<30)
231 #define MS_NOUSER (1<<31)
234 * Superblock flags that can be altered by MS_REMOUNT
236 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
239 * Old magic mount flag and mask
241 #define MS_MGC_VAL 0xC0ED0000
242 #define MS_MGC_MSK 0xffff0000
244 /* Inode flags - they have nothing to superblock flags now */
246 #define S_SYNC 1 /* Writes are synced at once */
247 #define S_NOATIME 2 /* Do not update access times */
248 #define S_APPEND 4 /* Append-only file */
249 #define S_IMMUTABLE 8 /* Immutable file */
250 #define S_DEAD 16 /* removed, but still open directory */
251 #define S_NOQUOTA 32 /* Inode is not counted to quota */
252 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
253 #define S_NOCMTIME 128 /* Do not update file c/mtime */
254 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
255 #define S_PRIVATE 512 /* Inode is fs-internal */
256 #define S_IMA 1024 /* Inode has an associated IMA struct */
257 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
258 #define S_NOSEC 4096 /* no suid or xattr security attributes */
261 * Note that nosuid etc flags are inode-specific: setting some file-system
262 * flags just means all the inodes inherit those flags by default. It might be
263 * possible to override it selectively if you really wanted to with some
264 * ioctl() that is not currently implemented.
266 * Exception: MS_RDONLY is always applied to the entire file system.
268 * Unfortunately, it is possible to change a filesystems flags with it mounted
269 * with files in use. This means that all of the inodes will not have their
270 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
271 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
273 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
275 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
276 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
277 ((inode)->i_flags & S_SYNC))
278 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
279 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
280 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
281 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
282 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
284 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
285 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
286 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
287 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
289 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
290 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
291 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
292 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
293 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
294 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
295 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
297 /* the read-only stuff doesn't really belong here, but any other place is
298 probably as bad and I don't want to create yet another include file. */
300 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
301 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
302 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
303 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
304 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
305 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
306 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
307 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
308 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
309 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
310 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
311 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
313 #define BLKPG _IO(0x12,105)/* See blkpg.h */
315 /* Some people are morons. Do not use sizeof! */
317 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
318 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
319 /* This was here just to show that the number is taken -
320 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
322 /* A jump here: 108-111 have been used for various private purposes. */
323 #define BLKBSZGET _IOR(0x12,112,size_t)
324 #define BLKBSZSET _IOW(0x12,113,size_t)
325 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
326 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
327 #define BLKTRACESTART _IO(0x12,116)
328 #define BLKTRACESTOP _IO(0x12,117)
329 #define BLKTRACETEARDOWN _IO(0x12,118)
330 #define BLKDISCARD _IO(0x12,119)
331 #define BLKIOMIN _IO(0x12,120)
332 #define BLKIOOPT _IO(0x12,121)
333 #define BLKALIGNOFF _IO(0x12,122)
334 #define BLKPBSZGET _IO(0x12,123)
335 #define BLKDISCARDZEROES _IO(0x12,124)
336 #define BLKSECDISCARD _IO(0x12,125)
337 #define BLKROTATIONAL _IO(0x12,126)
339 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
340 #define FIBMAP _IO(0x00,1) /* bmap access */
341 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
342 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
343 #define FITHAW _IOWR('X', 120, int) /* Thaw */
344 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
346 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
347 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
348 #define FS_IOC_GETVERSION _IOR('v', 1, long)
349 #define FS_IOC_SETVERSION _IOW('v', 2, long)
350 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
351 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
352 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
353 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
354 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
357 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
359 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
360 #define FS_UNRM_FL 0x00000002 /* Undelete */
361 #define FS_COMPR_FL 0x00000004 /* Compress file */
362 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
363 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
364 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
365 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
366 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
367 /* Reserved for compression usage... */
368 #define FS_DIRTY_FL 0x00000100
369 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
370 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
371 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
372 /* End compression flags --- maybe not all used */
373 #define FS_BTREE_FL 0x00001000 /* btree format dir */
374 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
375 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
376 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
377 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
378 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
379 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
380 #define FS_EXTENT_FL 0x00080000 /* Extents */
381 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
382 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
383 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
385 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
386 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
389 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
390 #define SYNC_FILE_RANGE_WRITE 2
391 #define SYNC_FILE_RANGE_WAIT_AFTER 4
395 #include <linux/linkage.h>
396 #include <linux/wait.h>
397 #include <linux/kdev_t.h>
398 #include <linux/dcache.h>
399 #include <linux/path.h>
400 #include <linux/stat.h>
401 #include <linux/cache.h>
402 #include <linux/list.h>
403 #include <linux/radix-tree.h>
404 #include <linux/prio_tree.h>
405 #include <linux/init.h>
406 #include <linux/pid.h>
407 #include <linux/bug.h>
408 #include <linux/mutex.h>
409 #include <linux/capability.h>
410 #include <linux/semaphore.h>
411 #include <linux/fiemap.h>
412 #include <linux/rculist_bl.h>
413 #include <linux/atomic.h>
414 #include <linux/shrinker.h>
415 #include <linux/migrate_mode.h>
416 #include <linux/uidgid.h>
418 #include <asm/byteorder.h>
420 struct export_operations;
426 struct pipe_inode_info;
427 struct poll_table_struct;
429 struct vm_area_struct;
433 extern void __init inode_init(void);
434 extern void __init inode_init_early(void);
435 extern void __init files_init(unsigned long);
437 extern struct files_stat_struct files_stat;
438 extern unsigned long get_max_files(void);
439 extern int sysctl_nr_open;
440 extern struct inodes_stat_t inodes_stat;
441 extern int leases_enable, lease_break_time;
444 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
445 struct buffer_head *bh_result, int create);
446 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
447 ssize_t bytes, void *private, int ret,
451 * Attribute flags. These should be or-ed together to figure out what
454 #define ATTR_MODE (1 << 0)
455 #define ATTR_UID (1 << 1)
456 #define ATTR_GID (1 << 2)
457 #define ATTR_SIZE (1 << 3)
458 #define ATTR_ATIME (1 << 4)
459 #define ATTR_MTIME (1 << 5)
460 #define ATTR_CTIME (1 << 6)
461 #define ATTR_ATIME_SET (1 << 7)
462 #define ATTR_MTIME_SET (1 << 8)
463 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
464 #define ATTR_ATTR_FLAG (1 << 10)
465 #define ATTR_KILL_SUID (1 << 11)
466 #define ATTR_KILL_SGID (1 << 12)
467 #define ATTR_FILE (1 << 13)
468 #define ATTR_KILL_PRIV (1 << 14)
469 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
470 #define ATTR_TIMES_SET (1 << 16)
473 * This is the Inode Attributes structure, used for notify_change(). It
474 * uses the above definitions as flags, to know which values have changed.
475 * Also, in this manner, a Filesystem can look at only the values it cares
476 * about. Basically, these are the attributes that the VFS layer can
477 * request to change from the FS layer.
479 * Derek Atkins <warlord@MIT.EDU> 94-10-20
482 unsigned int ia_valid;
487 struct timespec ia_atime;
488 struct timespec ia_mtime;
489 struct timespec ia_ctime;
492 * Not an attribute, but an auxiliary info for filesystems wanting to
493 * implement an ftruncate() like method. NOTE: filesystem should
494 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
496 struct file *ia_file;
500 * Includes for diskquotas.
502 #include <linux/quota.h>
505 * enum positive_aop_returns - aop return codes with specific semantics
507 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
508 * completed, that the page is still locked, and
509 * should be considered active. The VM uses this hint
510 * to return the page to the active list -- it won't
511 * be a candidate for writeback again in the near
512 * future. Other callers must be careful to unlock
513 * the page if they get this return. Returned by
516 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
517 * unlocked it and the page might have been truncated.
518 * The caller should back up to acquiring a new page and
519 * trying again. The aop will be taking reasonable
520 * precautions not to livelock. If the caller held a page
521 * reference, it should drop it before retrying. Returned
524 * address_space_operation functions return these large constants to indicate
525 * special semantics to the caller. These are much larger than the bytes in a
526 * page to allow for functions that return the number of bytes operated on in a
530 enum positive_aop_returns {
531 AOP_WRITEPAGE_ACTIVATE = 0x80000,
532 AOP_TRUNCATED_PAGE = 0x80001,
535 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
536 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
537 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
538 * helper code (eg buffer layer)
539 * to clear GFP_FS from alloc */
542 * oh the beauties of C type declarations.
545 struct address_space;
546 struct writeback_control;
549 const struct iovec *iov;
550 unsigned long nr_segs;
555 size_t iov_iter_copy_from_user_atomic(struct page *page,
556 struct iov_iter *i, unsigned long offset, size_t bytes);
557 size_t iov_iter_copy_from_user(struct page *page,
558 struct iov_iter *i, unsigned long offset, size_t bytes);
559 void iov_iter_advance(struct iov_iter *i, size_t bytes);
560 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
561 size_t iov_iter_single_seg_count(struct iov_iter *i);
563 static inline void iov_iter_init(struct iov_iter *i,
564 const struct iovec *iov, unsigned long nr_segs,
565 size_t count, size_t written)
568 i->nr_segs = nr_segs;
570 i->count = count + written;
572 iov_iter_advance(i, written);
575 static inline size_t iov_iter_count(struct iov_iter *i)
581 * "descriptor" for what we're up to with a read.
582 * This allows us to use the same read code yet
583 * have multiple different users of the data that
584 * we read from a file.
586 * The simplest case just copies the data to user
599 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
600 unsigned long, unsigned long);
602 struct address_space_operations {
603 int (*writepage)(struct page *page, struct writeback_control *wbc);
604 int (*readpage)(struct file *, struct page *);
606 /* Write back some dirty pages from this mapping. */
607 int (*writepages)(struct address_space *, struct writeback_control *);
609 /* Set a page dirty. Return true if this dirtied it */
610 int (*set_page_dirty)(struct page *page);
612 int (*readpages)(struct file *filp, struct address_space *mapping,
613 struct list_head *pages, unsigned nr_pages);
615 int (*write_begin)(struct file *, struct address_space *mapping,
616 loff_t pos, unsigned len, unsigned flags,
617 struct page **pagep, void **fsdata);
618 int (*write_end)(struct file *, struct address_space *mapping,
619 loff_t pos, unsigned len, unsigned copied,
620 struct page *page, void *fsdata);
622 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
623 sector_t (*bmap)(struct address_space *, sector_t);
624 void (*invalidatepage) (struct page *, unsigned long);
625 int (*releasepage) (struct page *, gfp_t);
626 void (*freepage)(struct page *);
627 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
628 loff_t offset, unsigned long nr_segs);
629 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
630 void **, unsigned long *);
632 * migrate the contents of a page to the specified target. If sync
633 * is false, it must not block.
635 int (*migratepage) (struct address_space *,
636 struct page *, struct page *, enum migrate_mode);
637 int (*launder_page) (struct page *);
638 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
640 int (*error_remove_page)(struct address_space *, struct page *);
642 /* swapfile support */
643 int (*swap_activate)(struct file *file);
644 int (*swap_deactivate)(struct file *file);
647 extern const struct address_space_operations empty_aops;
650 * pagecache_write_begin/pagecache_write_end must be used by general code
651 * to write into the pagecache.
653 int pagecache_write_begin(struct file *, struct address_space *mapping,
654 loff_t pos, unsigned len, unsigned flags,
655 struct page **pagep, void **fsdata);
657 int pagecache_write_end(struct file *, struct address_space *mapping,
658 loff_t pos, unsigned len, unsigned copied,
659 struct page *page, void *fsdata);
661 struct backing_dev_info;
662 struct address_space {
663 struct inode *host; /* owner: inode, block_device */
664 struct radix_tree_root page_tree; /* radix tree of all pages */
665 spinlock_t tree_lock; /* and lock protecting it */
666 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
667 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
668 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
669 struct mutex i_mmap_mutex; /* protect tree, count, list */
670 /* Protected by tree_lock together with the radix tree */
671 unsigned long nrpages; /* number of total pages */
672 pgoff_t writeback_index;/* writeback starts here */
673 const struct address_space_operations *a_ops; /* methods */
674 unsigned long flags; /* error bits/gfp mask */
675 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
676 spinlock_t private_lock; /* for use by the address_space */
677 struct list_head private_list; /* ditto */
678 struct address_space *assoc_mapping; /* ditto */
679 } __attribute__((aligned(sizeof(long))));
681 * On most architectures that alignment is already the case; but
682 * must be enforced here for CRIS, to let the least significant bit
683 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
685 struct request_queue;
687 struct block_device {
688 dev_t bd_dev; /* not a kdev_t - it's a search key */
690 struct inode * bd_inode; /* will die */
691 struct super_block * bd_super;
692 struct mutex bd_mutex; /* open/close mutex */
693 struct list_head bd_inodes;
697 bool bd_write_holder;
699 struct list_head bd_holder_disks;
701 struct block_device * bd_contains;
702 unsigned bd_block_size;
703 struct hd_struct * bd_part;
704 /* number of times partitions within this device have been opened. */
705 unsigned bd_part_count;
707 struct gendisk * bd_disk;
708 struct request_queue * bd_queue;
709 struct list_head bd_list;
711 * Private data. You must have bd_claim'ed the block_device
712 * to use this. NOTE: bd_claim allows an owner to claim
713 * the same device multiple times, the owner must take special
714 * care to not mess up bd_private for that case.
716 unsigned long bd_private;
718 /* The counter of freeze processes */
719 int bd_fsfreeze_count;
720 /* Mutex for freeze */
721 struct mutex bd_fsfreeze_mutex;
725 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
728 #define PAGECACHE_TAG_DIRTY 0
729 #define PAGECACHE_TAG_WRITEBACK 1
730 #define PAGECACHE_TAG_TOWRITE 2
732 int mapping_tagged(struct address_space *mapping, int tag);
735 * Might pages of this file be mapped into userspace?
737 static inline int mapping_mapped(struct address_space *mapping)
739 return !prio_tree_empty(&mapping->i_mmap) ||
740 !list_empty(&mapping->i_mmap_nonlinear);
744 * Might pages of this file have been modified in userspace?
745 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
746 * marks vma as VM_SHARED if it is shared, and the file was opened for
747 * writing i.e. vma may be mprotected writable even if now readonly.
749 static inline int mapping_writably_mapped(struct address_space *mapping)
751 return mapping->i_mmap_writable != 0;
755 * Use sequence counter to get consistent i_size on 32-bit processors.
757 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
758 #include <linux/seqlock.h>
759 #define __NEED_I_SIZE_ORDERED
760 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
762 #define i_size_ordered_init(inode) do { } while (0)
766 #define ACL_NOT_CACHED ((void *)(-1))
768 #define IOP_FASTPERM 0x0001
769 #define IOP_LOOKUP 0x0002
770 #define IOP_NOFOLLOW 0x0004
773 * Keep mostly read-only and often accessed (especially for
774 * the RCU path lookup and 'stat' data) fields at the beginning
775 * of the 'struct inode'
779 unsigned short i_opflags;
782 unsigned int i_flags;
784 #ifdef CONFIG_FS_POSIX_ACL
785 struct posix_acl *i_acl;
786 struct posix_acl *i_default_acl;
789 const struct inode_operations *i_op;
790 struct super_block *i_sb;
791 struct address_space *i_mapping;
793 #ifdef CONFIG_SECURITY
797 /* Stat data, not accessed from path walking */
800 * Filesystems may only read i_nlink directly. They shall use the
801 * following functions for modification:
803 * (set|clear|inc|drop)_nlink
804 * inode_(inc|dec)_link_count
807 const unsigned int i_nlink;
808 unsigned int __i_nlink;
812 struct timespec i_atime;
813 struct timespec i_mtime;
814 struct timespec i_ctime;
815 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
816 unsigned short i_bytes;
817 unsigned int i_blkbits;
820 #ifdef __NEED_I_SIZE_ORDERED
821 seqcount_t i_size_seqcount;
825 unsigned long i_state;
826 struct mutex i_mutex;
828 unsigned long dirtied_when; /* jiffies of first dirtying */
830 struct hlist_node i_hash;
831 struct list_head i_wb_list; /* backing dev IO list */
832 struct list_head i_lru; /* inode LRU list */
833 struct list_head i_sb_list;
835 struct hlist_head i_dentry;
836 struct rcu_head i_rcu;
840 atomic_t i_dio_count;
841 atomic_t i_writecount;
842 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
843 struct file_lock *i_flock;
844 struct address_space i_data;
846 struct dquot *i_dquot[MAXQUOTAS];
848 struct list_head i_devices;
850 struct pipe_inode_info *i_pipe;
851 struct block_device *i_bdev;
857 #ifdef CONFIG_FSNOTIFY
858 __u32 i_fsnotify_mask; /* all events this inode cares about */
859 struct hlist_head i_fsnotify_marks;
863 atomic_t i_readcount; /* struct files open RO */
865 void *i_private; /* fs or device private pointer */
868 static inline int inode_unhashed(struct inode *inode)
870 return hlist_unhashed(&inode->i_hash);
874 * inode->i_mutex nesting subclasses for the lock validator:
876 * 0: the object of the current VFS operation
881 * The locking order between these classes is
882 * parent -> child -> normal -> xattr -> quota
884 enum inode_i_mutex_lock_class
894 * NOTE: in a 32bit arch with a preemptable kernel and
895 * an UP compile the i_size_read/write must be atomic
896 * with respect to the local cpu (unlike with preempt disabled),
897 * but they don't need to be atomic with respect to other cpus like in
898 * true SMP (so they need either to either locally disable irq around
899 * the read or for example on x86 they can be still implemented as a
900 * cmpxchg8b without the need of the lock prefix). For SMP compiles
901 * and 64bit archs it makes no difference if preempt is enabled or not.
903 static inline loff_t i_size_read(const struct inode *inode)
905 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
910 seq = read_seqcount_begin(&inode->i_size_seqcount);
911 i_size = inode->i_size;
912 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
914 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
918 i_size = inode->i_size;
922 return inode->i_size;
927 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
928 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
929 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
931 static inline void i_size_write(struct inode *inode, loff_t i_size)
933 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
934 write_seqcount_begin(&inode->i_size_seqcount);
935 inode->i_size = i_size;
936 write_seqcount_end(&inode->i_size_seqcount);
937 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
939 inode->i_size = i_size;
942 inode->i_size = i_size;
946 /* Helper functions so that in most cases filesystems will
947 * not need to deal directly with kuid_t and kgid_t and can
948 * instead deal with the raw numeric values that are stored
951 static inline uid_t i_uid_read(const struct inode *inode)
953 return from_kuid(&init_user_ns, inode->i_uid);
956 static inline gid_t i_gid_read(const struct inode *inode)
958 return from_kgid(&init_user_ns, inode->i_gid);
961 static inline void i_uid_write(struct inode *inode, uid_t uid)
963 inode->i_uid = make_kuid(&init_user_ns, uid);
966 static inline void i_gid_write(struct inode *inode, gid_t gid)
968 inode->i_gid = make_kgid(&init_user_ns, gid);
971 static inline unsigned iminor(const struct inode *inode)
973 return MINOR(inode->i_rdev);
976 static inline unsigned imajor(const struct inode *inode)
978 return MAJOR(inode->i_rdev);
981 extern struct block_device *I_BDEV(struct inode *inode);
984 rwlock_t lock; /* protects pid, uid, euid fields */
985 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
986 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
987 kuid_t uid, euid; /* uid/euid of process setting the owner */
988 int signum; /* posix.1b rt signal to be delivered on IO */
992 * Track a single file's readahead state
994 struct file_ra_state {
995 pgoff_t start; /* where readahead started */
996 unsigned int size; /* # of readahead pages */
997 unsigned int async_size; /* do asynchronous readahead when
998 there are only # of pages ahead */
1000 unsigned int ra_pages; /* Maximum readahead window */
1001 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
1002 loff_t prev_pos; /* Cache last read() position */
1006 * Check if @index falls in the readahead windows.
1008 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
1010 return (index >= ra->start &&
1011 index < ra->start + ra->size);
1014 #define FILE_MNT_WRITE_TAKEN 1
1015 #define FILE_MNT_WRITE_RELEASED 2
1019 * fu_list becomes invalid after file_free is called and queued via
1020 * fu_rcuhead for RCU freeing
1023 struct list_head fu_list;
1024 struct rcu_head fu_rcuhead;
1027 #define f_dentry f_path.dentry
1028 #define f_vfsmnt f_path.mnt
1029 const struct file_operations *f_op;
1032 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
1033 * Must not be taken from IRQ context.
1039 atomic_long_t f_count;
1040 unsigned int f_flags;
1043 struct fown_struct f_owner;
1044 const struct cred *f_cred;
1045 struct file_ra_state f_ra;
1048 #ifdef CONFIG_SECURITY
1051 /* needed for tty driver, and maybe others */
1055 /* Used by fs/eventpoll.c to link all the hooks to this file */
1056 struct list_head f_ep_links;
1057 struct list_head f_tfile_llink;
1058 #endif /* #ifdef CONFIG_EPOLL */
1059 struct address_space *f_mapping;
1060 #ifdef CONFIG_DEBUG_WRITECOUNT
1061 unsigned long f_mnt_write_state;
1065 struct file_handle {
1068 /* file identifier */
1069 unsigned char f_handle[0];
1072 #define get_file(x) atomic_long_inc(&(x)->f_count)
1073 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
1074 #define file_count(x) atomic_long_read(&(x)->f_count)
1076 #ifdef CONFIG_DEBUG_WRITECOUNT
1077 static inline void file_take_write(struct file *f)
1079 WARN_ON(f->f_mnt_write_state != 0);
1080 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
1082 static inline void file_release_write(struct file *f)
1084 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
1086 static inline void file_reset_write(struct file *f)
1088 f->f_mnt_write_state = 0;
1090 static inline void file_check_state(struct file *f)
1093 * At this point, either both or neither of these bits
1096 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
1097 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
1099 static inline int file_check_writeable(struct file *f)
1101 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
1103 printk(KERN_WARNING "writeable file with no "
1104 "mnt_want_write()\n");
1108 #else /* !CONFIG_DEBUG_WRITECOUNT */
1109 static inline void file_take_write(struct file *filp) {}
1110 static inline void file_release_write(struct file *filp) {}
1111 static inline void file_reset_write(struct file *filp) {}
1112 static inline void file_check_state(struct file *filp) {}
1113 static inline int file_check_writeable(struct file *filp)
1117 #endif /* CONFIG_DEBUG_WRITECOUNT */
1119 #define MAX_NON_LFS ((1UL<<31) - 1)
1121 /* Page cache limit. The filesystems should put that into their s_maxbytes
1122 limits, otherwise bad things can happen in VM. */
1123 #if BITS_PER_LONG==32
1124 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1125 #elif BITS_PER_LONG==64
1126 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1131 #define FL_ACCESS 8 /* not trying to lock, just looking */
1132 #define FL_EXISTS 16 /* when unlocking, test for existence */
1133 #define FL_LEASE 32 /* lease held on this file */
1134 #define FL_CLOSE 64 /* unlock on close */
1135 #define FL_SLEEP 128 /* A blocking lock */
1136 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
1137 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
1140 * Special return value from posix_lock_file() and vfs_lock_file() for
1141 * asynchronous locking.
1143 #define FILE_LOCK_DEFERRED 1
1146 * The POSIX file lock owner is determined by
1147 * the "struct files_struct" in the thread group
1148 * (or NULL for no owner - BSD locks).
1150 * Lockd stuffs a "host" pointer into this.
1152 typedef struct files_struct *fl_owner_t;
1154 struct file_lock_operations {
1155 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1156 void (*fl_release_private)(struct file_lock *);
1159 struct lock_manager_operations {
1160 int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
1161 void (*lm_notify)(struct file_lock *); /* unblock callback */
1162 int (*lm_grant)(struct file_lock *, struct file_lock *, int);
1163 void (*lm_release_private)(struct file_lock *);
1164 void (*lm_break)(struct file_lock *);
1165 int (*lm_change)(struct file_lock **, int);
1168 struct lock_manager {
1169 struct list_head list;
1172 void locks_start_grace(struct lock_manager *);
1173 void locks_end_grace(struct lock_manager *);
1174 int locks_in_grace(void);
1176 /* that will die - we need it for nfs_lock_info */
1177 #include <linux/nfs_fs_i.h>
1180 struct file_lock *fl_next; /* singly linked list for this inode */
1181 struct list_head fl_link; /* doubly linked list of all locks */
1182 struct list_head fl_block; /* circular list of blocked processes */
1183 fl_owner_t fl_owner;
1184 unsigned int fl_flags;
1185 unsigned char fl_type;
1186 unsigned int fl_pid;
1187 struct pid *fl_nspid;
1188 wait_queue_head_t fl_wait;
1189 struct file *fl_file;
1193 struct fasync_struct * fl_fasync; /* for lease break notifications */
1194 /* for lease breaks: */
1195 unsigned long fl_break_time;
1196 unsigned long fl_downgrade_time;
1198 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1199 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1201 struct nfs_lock_info nfs_fl;
1202 struct nfs4_lock_info nfs4_fl;
1204 struct list_head link; /* link in AFS vnode's pending_locks list */
1205 int state; /* state of grant or error if -ve */
1210 /* The following constant reflects the upper bound of the file/locking space */
1212 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1213 #define OFFSET_MAX INT_LIMIT(loff_t)
1214 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1217 #include <linux/fcntl.h>
1219 extern void send_sigio(struct fown_struct *fown, int fd, int band);
1221 #ifdef CONFIG_FILE_LOCKING
1222 extern int fcntl_getlk(struct file *, struct flock __user *);
1223 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1224 struct flock __user *);
1226 #if BITS_PER_LONG == 32
1227 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1228 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1229 struct flock64 __user *);
1232 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1233 extern int fcntl_getlease(struct file *filp);
1236 void locks_free_lock(struct file_lock *fl);
1237 extern void locks_init_lock(struct file_lock *);
1238 extern struct file_lock * locks_alloc_lock(void);
1239 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1240 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1241 extern void locks_remove_posix(struct file *, fl_owner_t);
1242 extern void locks_remove_flock(struct file *);
1243 extern void locks_release_private(struct file_lock *);
1244 extern void posix_test_lock(struct file *, struct file_lock *);
1245 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1246 extern int posix_lock_file_wait(struct file *, struct file_lock *);
1247 extern int posix_unblock_lock(struct file *, struct file_lock *);
1248 extern int vfs_test_lock(struct file *, struct file_lock *);
1249 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
1250 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1251 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1252 extern int __break_lease(struct inode *inode, unsigned int flags);
1253 extern void lease_get_mtime(struct inode *, struct timespec *time);
1254 extern int generic_setlease(struct file *, long, struct file_lock **);
1255 extern int vfs_setlease(struct file *, long, struct file_lock **);
1256 extern int lease_modify(struct file_lock **, int);
1257 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1258 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1259 extern void locks_delete_block(struct file_lock *waiter);
1260 extern void lock_flocks(void);
1261 extern void unlock_flocks(void);
1262 #else /* !CONFIG_FILE_LOCKING */
1263 static inline int fcntl_getlk(struct file *file, struct flock __user *user)
1268 static inline int fcntl_setlk(unsigned int fd, struct file *file,
1269 unsigned int cmd, struct flock __user *user)
1274 #if BITS_PER_LONG == 32
1275 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
1280 static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1281 unsigned int cmd, struct flock64 __user *user)
1286 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1291 static inline int fcntl_getlease(struct file *filp)
1296 static inline void locks_init_lock(struct file_lock *fl)
1301 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1306 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1311 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1316 static inline void locks_remove_flock(struct file *filp)
1321 static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1326 static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1327 struct file_lock *conflock)
1332 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
1337 static inline int posix_unblock_lock(struct file *filp,
1338 struct file_lock *waiter)
1343 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1348 static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1349 struct file_lock *fl, struct file_lock *conf)
1354 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1359 static inline int flock_lock_file_wait(struct file *filp,
1360 struct file_lock *request)
1365 static inline int __break_lease(struct inode *inode, unsigned int mode)
1370 static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1375 static inline int generic_setlease(struct file *filp, long arg,
1376 struct file_lock **flp)
1381 static inline int vfs_setlease(struct file *filp, long arg,
1382 struct file_lock **lease)
1387 static inline int lease_modify(struct file_lock **before, int arg)
1392 static inline int lock_may_read(struct inode *inode, loff_t start,
1398 static inline int lock_may_write(struct inode *inode, loff_t start,
1404 static inline void locks_delete_block(struct file_lock *waiter)
1408 static inline void lock_flocks(void)
1412 static inline void unlock_flocks(void)
1416 #endif /* !CONFIG_FILE_LOCKING */
1419 struct fasync_struct {
1423 struct fasync_struct *fa_next; /* singly linked list */
1424 struct file *fa_file;
1425 struct rcu_head fa_rcu;
1428 #define FASYNC_MAGIC 0x4601
1430 /* SMP safe fasync helpers: */
1431 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1432 extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
1433 extern int fasync_remove_entry(struct file *, struct fasync_struct **);
1434 extern struct fasync_struct *fasync_alloc(void);
1435 extern void fasync_free(struct fasync_struct *);
1437 /* can be called from interrupts */
1438 extern void kill_fasync(struct fasync_struct **, int, int);
1440 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1441 extern int f_setown(struct file *filp, unsigned long arg, int force);
1442 extern void f_delown(struct file *filp);
1443 extern pid_t f_getown(struct file *filp);
1444 extern int send_sigurg(struct fown_struct *fown);
1450 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1451 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1452 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1453 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1454 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1456 extern struct list_head super_blocks;
1457 extern spinlock_t sb_lock;
1459 struct super_block {
1460 struct list_head s_list; /* Keep this first */
1461 dev_t s_dev; /* search index; _not_ kdev_t */
1462 unsigned char s_dirt;
1463 unsigned char s_blocksize_bits;
1464 unsigned long s_blocksize;
1465 loff_t s_maxbytes; /* Max file size */
1466 struct file_system_type *s_type;
1467 const struct super_operations *s_op;
1468 const struct dquot_operations *dq_op;
1469 const struct quotactl_ops *s_qcop;
1470 const struct export_operations *s_export_op;
1471 unsigned long s_flags;
1472 unsigned long s_magic;
1473 struct dentry *s_root;
1474 struct rw_semaphore s_umount;
1475 struct mutex s_lock;
1478 #ifdef CONFIG_SECURITY
1481 const struct xattr_handler **s_xattr;
1483 struct list_head s_inodes; /* all inodes */
1484 struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */
1486 struct list_head __percpu *s_files;
1488 struct list_head s_files;
1490 struct list_head s_mounts; /* list of mounts; _not_ for fs use */
1491 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1492 struct list_head s_dentry_lru; /* unused dentry lru */
1493 int s_nr_dentry_unused; /* # of dentry on lru */
1495 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1496 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp;
1497 struct list_head s_inode_lru; /* unused inode lru */
1498 int s_nr_inodes_unused; /* # of inodes on lru */
1500 struct block_device *s_bdev;
1501 struct backing_dev_info *s_bdi;
1502 struct mtd_info *s_mtd;
1503 struct hlist_node s_instances;
1504 struct quota_info s_dquot; /* Diskquota specific options */
1507 wait_queue_head_t s_wait_unfrozen;
1509 char s_id[32]; /* Informational name */
1510 u8 s_uuid[16]; /* UUID */
1512 void *s_fs_info; /* Filesystem private info */
1513 unsigned int s_max_links;
1516 /* Granularity of c/m/atime in ns.
1517 Cannot be worse than a second */
1521 * The next field is for VFS *only*. No filesystems have any business
1522 * even looking at it. You had been warned.
1524 struct mutex s_vfs_rename_mutex; /* Kludge */
1527 * Filesystem subtype. If non-empty the filesystem type field
1528 * in /proc/mounts will be "type.subtype"
1533 * Saved mount options for lazy filesystems using
1534 * generic_show_options()
1536 char __rcu *s_options;
1537 const struct dentry_operations *s_d_op; /* default d_op for dentries */
1540 * Saved pool identifier for cleancache (-1 means none)
1542 int cleancache_poolid;
1544 struct shrinker s_shrink; /* per-sb shrinker handle */
1546 /* Number of inodes with nlink == 0 but still referenced */
1547 atomic_long_t s_remove_count;
1549 /* Being remounted read-only */
1550 int s_readonly_remount;
1553 /* superblock cache pruning functions */
1554 extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
1555 extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);
1557 extern struct timespec current_fs_time(struct super_block *sb);
1560 * Snapshotting support.
1564 SB_FREEZE_WRITE = 1,
1565 SB_FREEZE_TRANS = 2,
1568 #define vfs_check_frozen(sb, level) \
1569 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1571 extern bool inode_owner_or_capable(const struct inode *inode);
1573 /* not quite ready to be deprecated, but... */
1574 extern void lock_super(struct super_block *);
1575 extern void unlock_super(struct super_block *);
1578 * VFS helper functions..
1580 extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
1581 extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
1582 extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1583 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
1584 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1585 extern int vfs_rmdir(struct inode *, struct dentry *);
1586 extern int vfs_unlink(struct inode *, struct dentry *);
1587 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1590 * VFS dentry helper functions.
1592 extern void dentry_unhash(struct dentry *dentry);
1595 * VFS file helper functions.
1597 extern void inode_init_owner(struct inode *inode, const struct inode *dir,
1600 * VFS FS_IOC_FIEMAP helper definitions.
1602 struct fiemap_extent_info {
1603 unsigned int fi_flags; /* Flags as passed from user */
1604 unsigned int fi_extents_mapped; /* Number of mapped extents */
1605 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1606 struct fiemap_extent __user *fi_extents_start; /* Start of
1607 fiemap_extent array */
1609 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1610 u64 phys, u64 len, u32 flags);
1611 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1616 * NOTE! These match bits 12..15 of stat.st_mode
1617 * (ie "(i_mode >> 12) & 15").
1619 #define DT_UNKNOWN 0
1630 * This is the "filldir" function type, used by readdir() to let
1631 * the kernel specify what kind of dirent layout it wants to have.
1632 * This allows the kernel to read directories into kernel space or
1633 * to have different dirent layouts depending on the binary type.
1635 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1636 struct block_device_operations;
1638 /* These macros are for out of kernel modules to test that
1639 * the kernel supports the unlocked_ioctl and compat_ioctl
1640 * fields in struct file_operations. */
1641 #define HAVE_COMPAT_IOCTL 1
1642 #define HAVE_UNLOCKED_IOCTL 1
1644 struct file_operations {
1645 struct module *owner;
1646 loff_t (*llseek) (struct file *, loff_t, int);
1647 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1648 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1649 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1650 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1651 int (*readdir) (struct file *, void *, filldir_t);
1652 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1653 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1654 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1655 int (*mmap) (struct file *, struct vm_area_struct *);
1656 int (*open) (struct inode *, struct file *);
1657 int (*flush) (struct file *, fl_owner_t id);
1658 int (*release) (struct inode *, struct file *);
1659 int (*fsync) (struct file *, loff_t, loff_t, int datasync);
1660 int (*aio_fsync) (struct kiocb *, int datasync);
1661 int (*fasync) (int, struct file *, int);
1662 int (*lock) (struct file *, int, struct file_lock *);
1663 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1664 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1665 int (*check_flags)(int);
1666 int (*flock) (struct file *, int, struct file_lock *);
1667 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1668 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1669 int (*setlease)(struct file *, long, struct file_lock **);
1670 long (*fallocate)(struct file *file, int mode, loff_t offset,
1674 struct inode_operations {
1675 struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1676 void * (*follow_link) (struct dentry *, struct nameidata *);
1677 int (*permission) (struct inode *, int);
1678 struct posix_acl * (*get_acl)(struct inode *, int);
1680 int (*readlink) (struct dentry *, char __user *,int);
1681 void (*put_link) (struct dentry *, struct nameidata *, void *);
1683 int (*create) (struct inode *,struct dentry *, umode_t, bool);
1684 int (*link) (struct dentry *,struct inode *,struct dentry *);
1685 int (*unlink) (struct inode *,struct dentry *);
1686 int (*symlink) (struct inode *,struct dentry *,const char *);
1687 int (*mkdir) (struct inode *,struct dentry *,umode_t);
1688 int (*rmdir) (struct inode *,struct dentry *);
1689 int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
1690 int (*rename) (struct inode *, struct dentry *,
1691 struct inode *, struct dentry *);
1692 void (*truncate) (struct inode *);
1693 int (*setattr) (struct dentry *, struct iattr *);
1694 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1695 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1696 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1697 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1698 int (*removexattr) (struct dentry *, const char *);
1699 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1701 int (*update_time)(struct inode *, struct timespec *, int);
1702 int (*atomic_open)(struct inode *, struct dentry *,
1703 struct file *, unsigned open_flag,
1704 umode_t create_mode, int *opened);
1705 } ____cacheline_aligned;
1709 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1710 unsigned long nr_segs, unsigned long fast_segs,
1711 struct iovec *fast_pointer,
1712 struct iovec **ret_pointer);
1714 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1715 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1716 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1717 unsigned long, loff_t *);
1718 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1719 unsigned long, loff_t *);
1721 struct super_operations {
1722 struct inode *(*alloc_inode)(struct super_block *sb);
1723 void (*destroy_inode)(struct inode *);
1725 void (*dirty_inode) (struct inode *, int flags);
1726 int (*write_inode) (struct inode *, struct writeback_control *wbc);
1727 int (*drop_inode) (struct inode *);
1728 void (*evict_inode) (struct inode *);
1729 void (*put_super) (struct super_block *);
1730 void (*write_super) (struct super_block *);
1731 int (*sync_fs)(struct super_block *sb, int wait);
1732 int (*freeze_fs) (struct super_block *);
1733 int (*unfreeze_fs) (struct super_block *);
1734 int (*statfs) (struct dentry *, struct kstatfs *);
1735 int (*remount_fs) (struct super_block *, int *, char *);
1736 void (*umount_begin) (struct super_block *);
1738 int (*show_options)(struct seq_file *, struct dentry *);
1739 int (*show_devname)(struct seq_file *, struct dentry *);
1740 int (*show_path)(struct seq_file *, struct dentry *);
1741 int (*show_stats)(struct seq_file *, struct dentry *);
1743 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1744 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1746 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1747 int (*nr_cached_objects)(struct super_block *);
1748 void (*free_cached_objects)(struct super_block *, int);
1752 * Inode state bits. Protected by inode->i_lock
1754 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1755 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1757 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1758 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1759 * various stages of removing an inode.
1761 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1763 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1764 * fdatasync(). i_atime is the usual cause.
1765 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1766 * these changes separately from I_DIRTY_SYNC so that we
1767 * don't have to write inode on fdatasync() when only
1768 * mtime has changed in it.
1769 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1770 * I_NEW Serves as both a mutex and completion notification.
1771 * New inodes set I_NEW. If two processes both create
1772 * the same inode, one of them will release its inode and
1773 * wait for I_NEW to be released before returning.
1774 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1775 * also cause waiting on I_NEW, without I_NEW actually
1776 * being set. find_inode() uses this to prevent returning
1777 * nearly-dead inodes.
1778 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1779 * is zero. I_FREEING must be set when I_WILL_FREE is
1781 * I_FREEING Set when inode is about to be freed but still has dirty
1782 * pages or buffers attached or the inode itself is still
1784 * I_CLEAR Added by clear_inode(). In this state the inode is
1785 * clean and can be destroyed. Inode keeps I_FREEING.
1787 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1788 * prohibited for many purposes. iget() must wait for
1789 * the inode to be completely released, then create it
1790 * anew. Other functions will just ignore such inodes,
1791 * if appropriate. I_NEW is used for waiting.
1793 * I_SYNC Writeback of inode is running. The bit is set during
1794 * data writeback, and cleared with a wakeup on the bit
1795 * address once it is done. The bit is also used to pin
1796 * the inode in memory for flusher thread.
1798 * I_REFERENCED Marks the inode as recently references on the LRU list.
1800 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1802 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1804 #define I_DIRTY_SYNC (1 << 0)
1805 #define I_DIRTY_DATASYNC (1 << 1)
1806 #define I_DIRTY_PAGES (1 << 2)
1808 #define I_NEW (1 << __I_NEW)
1809 #define I_WILL_FREE (1 << 4)
1810 #define I_FREEING (1 << 5)
1811 #define I_CLEAR (1 << 6)
1813 #define I_SYNC (1 << __I_SYNC)
1814 #define I_REFERENCED (1 << 8)
1815 #define __I_DIO_WAKEUP 9
1816 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1818 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1820 extern void __mark_inode_dirty(struct inode *, int);
1821 static inline void mark_inode_dirty(struct inode *inode)
1823 __mark_inode_dirty(inode, I_DIRTY);
1826 static inline void mark_inode_dirty_sync(struct inode *inode)
1828 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1831 extern void inc_nlink(struct inode *inode);
1832 extern void drop_nlink(struct inode *inode);
1833 extern void clear_nlink(struct inode *inode);
1834 extern void set_nlink(struct inode *inode, unsigned int nlink);
1836 static inline void inode_inc_link_count(struct inode *inode)
1839 mark_inode_dirty(inode);
1842 static inline void inode_dec_link_count(struct inode *inode)
1845 mark_inode_dirty(inode);
1849 * inode_inc_iversion - increments i_version
1850 * @inode: inode that need to be updated
1852 * Every time the inode is modified, the i_version field will be incremented.
1853 * The filesystem has to be mounted with i_version flag
1856 static inline void inode_inc_iversion(struct inode *inode)
1858 spin_lock(&inode->i_lock);
1860 spin_unlock(&inode->i_lock);
1863 enum file_time_flags {
1870 extern void touch_atime(struct path *);
1871 static inline void file_accessed(struct file *file)
1873 if (!(file->f_flags & O_NOATIME))
1874 touch_atime(&file->f_path);
1877 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1878 int sync_inode_metadata(struct inode *inode, int wait);
1880 struct file_system_type {
1883 struct dentry *(*mount) (struct file_system_type *, int,
1884 const char *, void *);
1885 void (*kill_sb) (struct super_block *);
1886 struct module *owner;
1887 struct file_system_type * next;
1888 struct hlist_head fs_supers;
1890 struct lock_class_key s_lock_key;
1891 struct lock_class_key s_umount_key;
1892 struct lock_class_key s_vfs_rename_key;
1894 struct lock_class_key i_lock_key;
1895 struct lock_class_key i_mutex_key;
1896 struct lock_class_key i_mutex_dir_key;
1899 extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
1900 void *data, int (*fill_super)(struct super_block *, void *, int));
1901 extern struct dentry *mount_bdev(struct file_system_type *fs_type,
1902 int flags, const char *dev_name, void *data,
1903 int (*fill_super)(struct super_block *, void *, int));
1904 extern struct dentry *mount_single(struct file_system_type *fs_type,
1905 int flags, void *data,
1906 int (*fill_super)(struct super_block *, void *, int));
1907 extern struct dentry *mount_nodev(struct file_system_type *fs_type,
1908 int flags, void *data,
1909 int (*fill_super)(struct super_block *, void *, int));
1910 extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
1911 void generic_shutdown_super(struct super_block *sb);
1912 void kill_block_super(struct super_block *sb);
1913 void kill_anon_super(struct super_block *sb);
1914 void kill_litter_super(struct super_block *sb);
1915 void deactivate_super(struct super_block *sb);
1916 void deactivate_locked_super(struct super_block *sb);
1917 int set_anon_super(struct super_block *s, void *data);
1918 int get_anon_bdev(dev_t *);
1919 void free_anon_bdev(dev_t);
1920 struct super_block *sget(struct file_system_type *type,
1921 int (*test)(struct super_block *,void *),
1922 int (*set)(struct super_block *,void *),
1923 int flags, void *data);
1924 extern struct dentry *mount_pseudo(struct file_system_type *, char *,
1925 const struct super_operations *ops,
1926 const struct dentry_operations *dops,
1929 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1930 #define fops_get(fops) \
1931 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1932 #define fops_put(fops) \
1933 do { if (fops) module_put((fops)->owner); } while(0)
1935 extern int register_filesystem(struct file_system_type *);
1936 extern int unregister_filesystem(struct file_system_type *);
1937 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1938 #define kern_mount(type) kern_mount_data(type, NULL)
1939 extern void kern_unmount(struct vfsmount *mnt);
1940 extern int may_umount_tree(struct vfsmount *);
1941 extern int may_umount(struct vfsmount *);
1942 extern long do_mount(char *, char *, char *, unsigned long, void *);
1943 extern struct vfsmount *collect_mounts(struct path *);
1944 extern void drop_collected_mounts(struct vfsmount *);
1945 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
1947 extern int vfs_statfs(struct path *, struct kstatfs *);
1948 extern int user_statfs(const char __user *, struct kstatfs *);
1949 extern int fd_statfs(int, struct kstatfs *);
1950 extern int vfs_ustat(dev_t, struct kstatfs *);
1951 extern int freeze_super(struct super_block *super);
1952 extern int thaw_super(struct super_block *super);
1953 extern bool our_mnt(struct vfsmount *mnt);
1955 extern int current_umask(void);
1958 extern struct kobject *fs_kobj;
1960 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1961 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1963 #define FLOCK_VERIFY_READ 1
1964 #define FLOCK_VERIFY_WRITE 2
1966 #ifdef CONFIG_FILE_LOCKING
1967 extern int locks_mandatory_locked(struct inode *);
1968 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1971 * Candidates for mandatory locking have the setgid bit set
1972 * but no group execute bit - an otherwise meaningless combination.
1975 static inline int __mandatory_lock(struct inode *ino)
1977 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1981 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1982 * otherwise these will be advisory locks
1985 static inline int mandatory_lock(struct inode *ino)
1987 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1990 static inline int locks_verify_locked(struct inode *inode)
1992 if (mandatory_lock(inode))
1993 return locks_mandatory_locked(inode);
1997 static inline int locks_verify_truncate(struct inode *inode,
2001 if (inode->i_flock && mandatory_lock(inode))
2002 return locks_mandatory_area(
2003 FLOCK_VERIFY_WRITE, inode, filp,
2004 size < inode->i_size ? size : inode->i_size,
2005 (size < inode->i_size ? inode->i_size - size
2006 : size - inode->i_size)
2011 static inline int break_lease(struct inode *inode, unsigned int mode)
2014 return __break_lease(inode, mode);
2017 #else /* !CONFIG_FILE_LOCKING */
2018 static inline int locks_mandatory_locked(struct inode *inode)
2023 static inline int locks_mandatory_area(int rw, struct inode *inode,
2024 struct file *filp, loff_t offset,
2030 static inline int __mandatory_lock(struct inode *inode)
2035 static inline int mandatory_lock(struct inode *inode)
2040 static inline int locks_verify_locked(struct inode *inode)
2045 static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
2051 static inline int break_lease(struct inode *inode, unsigned int mode)
2056 #endif /* CONFIG_FILE_LOCKING */
2060 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
2062 extern int do_fallocate(struct file *file, int mode, loff_t offset,
2064 extern long do_sys_open(int dfd, const char __user *filename, int flags,
2066 extern struct file *filp_open(const char *, int, umode_t);
2067 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
2069 extern struct file * dentry_open(const struct path *, int, const struct cred *);
2070 extern int filp_close(struct file *, fl_owner_t id);
2071 extern char * getname(const char __user *);
2076 extern int finish_open(struct file *file, struct dentry *dentry,
2077 int (*open)(struct inode *, struct file *),
2079 extern int finish_no_open(struct file *file, struct dentry *dentry);
2083 extern int ioctl_preallocate(struct file *filp, void __user *argp);
2086 extern void __init vfs_caches_init_early(void);
2087 extern void __init vfs_caches_init(unsigned long);
2089 extern struct kmem_cache *names_cachep;
2091 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2092 #define __getname() __getname_gfp(GFP_KERNEL)
2093 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2094 #ifndef CONFIG_AUDITSYSCALL
2095 #define putname(name) __putname(name)
2097 extern void putname(const char *name);
2101 extern int register_blkdev(unsigned int, const char *);
2102 extern void unregister_blkdev(unsigned int, const char *);
2103 extern struct block_device *bdget(dev_t);
2104 extern struct block_device *bdgrab(struct block_device *bdev);
2105 extern void bd_set_size(struct block_device *, loff_t size);
2106 extern sector_t blkdev_max_block(struct block_device *bdev);
2107 extern void bd_forget(struct inode *inode);
2108 extern void bdput(struct block_device *);
2109 extern void invalidate_bdev(struct block_device *);
2110 extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
2111 extern int sync_blockdev(struct block_device *bdev);
2112 extern void kill_bdev(struct block_device *);
2113 extern struct super_block *freeze_bdev(struct block_device *);
2114 extern void emergency_thaw_all(void);
2115 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
2116 extern int fsync_bdev(struct block_device *);
2118 static inline void bd_forget(struct inode *inode) {}
2119 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
2120 static inline void kill_bdev(struct block_device *bdev) {}
2121 static inline void invalidate_bdev(struct block_device *bdev) {}
2123 static inline struct super_block *freeze_bdev(struct block_device *sb)
2128 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
2133 static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
2137 extern int sync_filesystem(struct super_block *);
2138 extern const struct file_operations def_blk_fops;
2139 extern const struct file_operations def_chr_fops;
2140 extern const struct file_operations bad_sock_fops;
2141 extern const struct file_operations def_fifo_fops;
2143 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2144 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
2145 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2146 extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2147 extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
2149 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
2151 extern int blkdev_put(struct block_device *bdev, fmode_t mode);
2153 extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2154 extern void bd_unlink_disk_holder(struct block_device *bdev,
2155 struct gendisk *disk);
2157 static inline int bd_link_disk_holder(struct block_device *bdev,
2158 struct gendisk *disk)
2162 static inline void bd_unlink_disk_holder(struct block_device *bdev,
2163 struct gendisk *disk)
2170 #define CHRDEV_MAJOR_HASH_SIZE 255
2171 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
2172 extern int register_chrdev_region(dev_t, unsigned, const char *);
2173 extern int __register_chrdev(unsigned int major, unsigned int baseminor,
2174 unsigned int count, const char *name,
2175 const struct file_operations *fops);
2176 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
2177 unsigned int count, const char *name);
2178 extern void unregister_chrdev_region(dev_t, unsigned);
2179 extern void chrdev_show(struct seq_file *,off_t);
2181 static inline int register_chrdev(unsigned int major, const char *name,
2182 const struct file_operations *fops)
2184 return __register_chrdev(major, 0, 256, name, fops);
2187 static inline void unregister_chrdev(unsigned int major, const char *name)
2189 __unregister_chrdev(major, 0, 256, name);
2192 /* fs/block_dev.c */
2193 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2194 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2197 #define BLKDEV_MAJOR_HASH_SIZE 255
2198 extern const char *__bdevname(dev_t, char *buffer);
2199 extern const char *bdevname(struct block_device *bdev, char *buffer);
2200 extern struct block_device *lookup_bdev(const char *);
2201 extern void blkdev_show(struct seq_file *,off_t);
2204 #define BLKDEV_MAJOR_HASH_SIZE 0
2207 extern void init_special_inode(struct inode *, umode_t, dev_t);
2209 /* Invalid inode operations -- fs/bad_inode.c */
2210 extern void make_bad_inode(struct inode *);
2211 extern int is_bad_inode(struct inode *);
2213 extern const struct file_operations read_pipefifo_fops;
2214 extern const struct file_operations write_pipefifo_fops;
2215 extern const struct file_operations rdwr_pipefifo_fops;
2219 * return READ, READA, or WRITE
2221 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2224 * return data direction, READ or WRITE
2226 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2228 extern void check_disk_size_change(struct gendisk *disk,
2229 struct block_device *bdev);
2230 extern int revalidate_disk(struct gendisk *);
2231 extern int check_disk_change(struct block_device *);
2232 extern int __invalidate_device(struct block_device *, bool);
2233 extern int invalidate_partition(struct gendisk *, int);
2235 unsigned long invalidate_mapping_pages(struct address_space *mapping,
2236 pgoff_t start, pgoff_t end);
2238 static inline void invalidate_remote_inode(struct inode *inode)
2240 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2241 S_ISLNK(inode->i_mode))
2242 invalidate_mapping_pages(inode->i_mapping, 0, -1);
2244 extern int invalidate_inode_pages2(struct address_space *mapping);
2245 extern int invalidate_inode_pages2_range(struct address_space *mapping,
2246 pgoff_t start, pgoff_t end);
2247 extern int write_inode_now(struct inode *, int);
2248 extern int filemap_fdatawrite(struct address_space *);
2249 extern int filemap_flush(struct address_space *);
2250 extern int filemap_fdatawait(struct address_space *);
2251 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
2253 extern int filemap_write_and_wait(struct address_space *mapping);
2254 extern int filemap_write_and_wait_range(struct address_space *mapping,
2255 loff_t lstart, loff_t lend);
2256 extern int __filemap_fdatawrite_range(struct address_space *mapping,
2257 loff_t start, loff_t end, int sync_mode);
2258 extern int filemap_fdatawrite_range(struct address_space *mapping,
2259 loff_t start, loff_t end);
2261 extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
2263 extern int vfs_fsync(struct file *file, int datasync);
2264 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
2265 extern void sync_supers(void);
2266 extern void emergency_sync(void);
2267 extern void emergency_remount(void);
2269 extern sector_t bmap(struct inode *, sector_t);
2271 extern int notify_change(struct dentry *, struct iattr *);
2272 extern int inode_permission(struct inode *, int);
2273 extern int generic_permission(struct inode *, int);
2275 static inline bool execute_ok(struct inode *inode)
2277 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2281 * get_write_access() gets write permission for a file.
2282 * put_write_access() releases this write permission.
2283 * This is used for regular files.
2284 * We cannot support write (and maybe mmap read-write shared) accesses and
2285 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2286 * can have the following values:
2287 * 0: no writers, no VM_DENYWRITE mappings
2288 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2289 * > 0: (i_writecount) users are writing to the file.
2291 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2292 * except for the cases where we don't hold i_writecount yet. Then we need to
2293 * use {get,deny}_write_access() - these functions check the sign and refuse
2294 * to do the change if sign is wrong.
2296 static inline int get_write_access(struct inode *inode)
2298 return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
2300 static inline int deny_write_access(struct file *file)
2302 struct inode *inode = file->f_path.dentry->d_inode;
2303 return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
2305 static inline void put_write_access(struct inode * inode)
2307 atomic_dec(&inode->i_writecount);
2309 static inline void allow_write_access(struct file *file)
2312 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
2315 static inline void i_readcount_dec(struct inode *inode)
2317 BUG_ON(!atomic_read(&inode->i_readcount));
2318 atomic_dec(&inode->i_readcount);
2320 static inline void i_readcount_inc(struct inode *inode)
2322 atomic_inc(&inode->i_readcount);
2325 static inline void i_readcount_dec(struct inode *inode)
2329 static inline void i_readcount_inc(struct inode *inode)
2334 extern int do_pipe_flags(int *, int);
2335 extern struct file *create_read_pipe(struct file *f, int flags);
2336 extern struct file *create_write_pipe(int flags);
2337 extern void free_write_pipe(struct file *);
2339 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
2340 extern struct file * open_exec(const char *);
2342 /* fs/dcache.c -- generic fs support functions */
2343 extern int is_subdir(struct dentry *, struct dentry *);
2344 extern int path_is_under(struct path *, struct path *);
2345 extern ino_t find_inode_number(struct dentry *, struct qstr *);
2347 #include <linux/err.h>
2349 /* needed for stackable file system support */
2350 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
2352 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
2354 extern int inode_init_always(struct super_block *, struct inode *);
2355 extern void inode_init_once(struct inode *);
2356 extern void address_space_init_once(struct address_space *mapping);
2357 extern void ihold(struct inode * inode);
2358 extern void iput(struct inode *);
2359 extern struct inode * igrab(struct inode *);
2360 extern ino_t iunique(struct super_block *, ino_t);
2361 extern int inode_needs_sync(struct inode *inode);
2362 extern int generic_delete_inode(struct inode *inode);
2363 static inline int generic_drop_inode(struct inode *inode)
2365 return !inode->i_nlink || inode_unhashed(inode);
2368 extern struct inode *ilookup5_nowait(struct super_block *sb,
2369 unsigned long hashval, int (*test)(struct inode *, void *),
2371 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2372 int (*test)(struct inode *, void *), void *data);
2373 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2375 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2376 extern struct inode * iget_locked(struct super_block *, unsigned long);
2377 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2378 extern int insert_inode_locked(struct inode *);
2379 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2380 extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
2382 static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
2384 extern void unlock_new_inode(struct inode *);
2385 extern unsigned int get_next_ino(void);
2387 extern void __iget(struct inode * inode);
2388 extern void iget_failed(struct inode *);
2389 extern void clear_inode(struct inode *);
2390 extern void __destroy_inode(struct inode *);
2391 extern struct inode *new_inode_pseudo(struct super_block *sb);
2392 extern struct inode *new_inode(struct super_block *sb);
2393 extern void free_inode_nonrcu(struct inode *inode);
2394 extern int should_remove_suid(struct dentry *);
2395 extern int file_remove_suid(struct file *);
2397 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2398 static inline void insert_inode_hash(struct inode *inode)
2400 __insert_inode_hash(inode, inode->i_ino);
2403 extern void __remove_inode_hash(struct inode *);
2404 static inline void remove_inode_hash(struct inode *inode)
2406 if (!inode_unhashed(inode))
2407 __remove_inode_hash(inode);
2410 extern void inode_sb_list_add(struct inode *inode);
2413 extern void submit_bio(int, struct bio *);
2414 extern int bdev_read_only(struct block_device *);
2416 extern int set_blocksize(struct block_device *, int);
2417 extern int sb_set_blocksize(struct super_block *, int);
2418 extern int sb_min_blocksize(struct super_block *, int);
2420 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2421 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2422 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
2423 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2424 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2425 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
2427 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2428 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
2429 unsigned long *, loff_t, loff_t *, size_t, size_t);
2430 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
2431 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2432 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2433 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2434 extern int generic_segment_checks(const struct iovec *iov,
2435 unsigned long *nr_segs, size_t *count, int access_flags);
2437 /* fs/block_dev.c */
2438 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
2439 unsigned long nr_segs, loff_t pos);
2440 extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
2442 extern void block_sync_page(struct page *page);
2445 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
2446 struct pipe_inode_info *, size_t, unsigned int);
2447 extern ssize_t default_file_splice_read(struct file *, loff_t *,
2448 struct pipe_inode_info *, size_t, unsigned int);
2449 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2450 struct file *, loff_t *, size_t, unsigned int);
2451 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2452 struct file *out, loff_t *, size_t len, unsigned int flags);
2453 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
2454 size_t len, unsigned int flags);
2457 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2458 extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
2459 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
2460 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
2461 extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
2462 int origin, loff_t maxsize, loff_t eof);
2463 extern int generic_file_open(struct inode * inode, struct file * filp);
2464 extern int nonseekable_open(struct inode * inode, struct file * filp);
2466 #ifdef CONFIG_FS_XIP
2467 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
2469 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2470 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2471 size_t len, loff_t *ppos);
2472 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2474 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2481 typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
2482 loff_t file_offset);
2485 /* need locking between buffered and direct access */
2488 /* filesystem does not support filling holes */
2489 DIO_SKIP_HOLES = 0x02,
2492 void dio_end_io(struct bio *bio, int error);
2494 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2495 struct block_device *bdev, const struct iovec *iov, loff_t offset,
2496 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
2497 dio_submit_t submit_io, int flags);
2499 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2500 struct inode *inode, const struct iovec *iov, loff_t offset,
2501 unsigned long nr_segs, get_block_t get_block)
2503 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2504 offset, nr_segs, get_block, NULL, NULL,
2505 DIO_LOCKING | DIO_SKIP_HOLES);
2509 void inode_dio_wait(struct inode *inode);
2510 void inode_dio_done(struct inode *inode);
2512 extern const struct file_operations generic_ro_fops;
2514 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2516 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2517 extern int vfs_follow_link(struct nameidata *, const char *);
2518 extern int page_readlink(struct dentry *, char __user *, int);
2519 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2520 extern void page_put_link(struct dentry *, struct nameidata *, void *);
2521 extern int __page_symlink(struct inode *inode, const char *symname, int len,
2523 extern int page_symlink(struct inode *inode, const char *symname, int len);
2524 extern const struct inode_operations page_symlink_inode_operations;
2525 extern int generic_readlink(struct dentry *, char __user *, int);
2526 extern void generic_fillattr(struct inode *, struct kstat *);
2527 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2528 void __inode_add_bytes(struct inode *inode, loff_t bytes);
2529 void inode_add_bytes(struct inode *inode, loff_t bytes);
2530 void inode_sub_bytes(struct inode *inode, loff_t bytes);
2531 loff_t inode_get_bytes(struct inode *inode);
2532 void inode_set_bytes(struct inode *inode, loff_t bytes);
2534 extern int vfs_readdir(struct file *, filldir_t, void *);
2536 extern int vfs_stat(const char __user *, struct kstat *);
2537 extern int vfs_lstat(const char __user *, struct kstat *);
2538 extern int vfs_fstat(unsigned int, struct kstat *);
2539 extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
2541 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2543 extern int __generic_block_fiemap(struct inode *inode,
2544 struct fiemap_extent_info *fieinfo,
2545 loff_t start, loff_t len,
2546 get_block_t *get_block);
2547 extern int generic_block_fiemap(struct inode *inode,
2548 struct fiemap_extent_info *fieinfo, u64 start,
2549 u64 len, get_block_t *get_block);
2551 extern void get_filesystem(struct file_system_type *fs);
2552 extern void put_filesystem(struct file_system_type *fs);
2553 extern struct file_system_type *get_fs_type(const char *name);
2554 extern struct super_block *get_super(struct block_device *);
2555 extern struct super_block *get_super_thawed(struct block_device *);
2556 extern struct super_block *get_active_super(struct block_device *bdev);
2557 extern void drop_super(struct super_block *sb);
2558 extern void iterate_supers(void (*)(struct super_block *, void *), void *);
2559 extern void iterate_supers_type(struct file_system_type *,
2560 void (*)(struct super_block *, void *), void *);
2562 extern int dcache_dir_open(struct inode *, struct file *);
2563 extern int dcache_dir_close(struct inode *, struct file *);
2564 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2565 extern int dcache_readdir(struct file *, void *, filldir_t);
2566 extern int simple_setattr(struct dentry *, struct iattr *);
2567 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2568 extern int simple_statfs(struct dentry *, struct kstatfs *);
2569 extern int simple_open(struct inode *inode, struct file *file);
2570 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2571 extern int simple_unlink(struct inode *, struct dentry *);
2572 extern int simple_rmdir(struct inode *, struct dentry *);
2573 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2574 extern int noop_fsync(struct file *, loff_t, loff_t, int);
2575 extern int simple_empty(struct dentry *);
2576 extern int simple_readpage(struct file *file, struct page *page);
2577 extern int simple_write_begin(struct file *file, struct address_space *mapping,
2578 loff_t pos, unsigned len, unsigned flags,
2579 struct page **pagep, void **fsdata);
2580 extern int simple_write_end(struct file *file, struct address_space *mapping,
2581 loff_t pos, unsigned len, unsigned copied,
2582 struct page *page, void *fsdata);
2584 extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
2585 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2586 extern const struct file_operations simple_dir_operations;
2587 extern const struct inode_operations simple_dir_inode_operations;
2588 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2589 struct dentry *d_alloc_name(struct dentry *, const char *);
2590 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2591 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
2592 extern void simple_release_fs(struct vfsmount **mount, int *count);
2594 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2595 loff_t *ppos, const void *from, size_t available);
2596 extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
2597 const void __user *from, size_t count);
2599 extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
2601 extern int generic_check_addressable(unsigned, u64);
2603 #ifdef CONFIG_MIGRATION
2604 extern int buffer_migrate_page(struct address_space *,
2605 struct page *, struct page *,
2608 #define buffer_migrate_page NULL
2611 extern int inode_change_ok(const struct inode *, struct iattr *);
2612 extern int inode_newsize_ok(const struct inode *, loff_t offset);
2613 extern void setattr_copy(struct inode *inode, const struct iattr *attr);
2615 extern int file_update_time(struct file *file);
2617 extern int generic_show_options(struct seq_file *m, struct dentry *root);
2618 extern void save_mount_options(struct super_block *sb, char *options);
2619 extern void replace_mount_options(struct super_block *sb, char *options);
2621 static inline ino_t parent_ino(struct dentry *dentry)
2626 * Don't strictly need d_lock here? If the parent ino could change
2627 * then surely we'd have a deeper race in the caller?
2629 spin_lock(&dentry->d_lock);
2630 res = dentry->d_parent->d_inode->i_ino;
2631 spin_unlock(&dentry->d_lock);
2635 /* Transaction based IO helpers */
2638 * An argresp is stored in an allocated page and holds the
2639 * size of the argument or response, along with its content
2641 struct simple_transaction_argresp {
2646 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2648 char *simple_transaction_get(struct file *file, const char __user *buf,
2650 ssize_t simple_transaction_read(struct file *file, char __user *buf,
2651 size_t size, loff_t *pos);
2652 int simple_transaction_release(struct inode *inode, struct file *file);
2654 void simple_transaction_set(struct file *file, size_t n);
2657 * simple attribute files
2659 * These attributes behave similar to those in sysfs:
2661 * Writing to an attribute immediately sets a value, an open file can be
2662 * written to multiple times.
2664 * Reading from an attribute creates a buffer from the value that might get
2665 * read with multiple read calls. When the attribute has been read
2666 * completely, no further read calls are possible until the file is opened
2669 * All attributes contain a text representation of a numeric value
2670 * that are accessed with the get() and set() functions.
2672 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2673 static int __fops ## _open(struct inode *inode, struct file *file) \
2675 __simple_attr_check_format(__fmt, 0ull); \
2676 return simple_attr_open(inode, file, __get, __set, __fmt); \
2678 static const struct file_operations __fops = { \
2679 .owner = THIS_MODULE, \
2680 .open = __fops ## _open, \
2681 .release = simple_attr_release, \
2682 .read = simple_attr_read, \
2683 .write = simple_attr_write, \
2684 .llseek = generic_file_llseek, \
2687 static inline __printf(1, 2)
2688 void __simple_attr_check_format(const char *fmt, ...)
2690 /* don't do anything, just let the compiler check the arguments; */
2693 int simple_attr_open(struct inode *inode, struct file *file,
2694 int (*get)(void *, u64 *), int (*set)(void *, u64),
2696 int simple_attr_release(struct inode *inode, struct file *file);
2697 ssize_t simple_attr_read(struct file *file, char __user *buf,
2698 size_t len, loff_t *ppos);
2699 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2700 size_t len, loff_t *ppos);
2703 int proc_nr_files(struct ctl_table *table, int write,
2704 void __user *buffer, size_t *lenp, loff_t *ppos);
2705 int proc_nr_dentry(struct ctl_table *table, int write,
2706 void __user *buffer, size_t *lenp, loff_t *ppos);
2707 int proc_nr_inodes(struct ctl_table *table, int write,
2708 void __user *buffer, size_t *lenp, loff_t *ppos);
2709 int __init get_filesystem_list(char *buf);
2711 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2712 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2714 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2715 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2716 (flag & __FMODE_NONOTIFY)))
2718 static inline int is_sxid(umode_t mode)
2720 return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
2723 static inline void inode_has_no_xattr(struct inode *inode)
2725 if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
2726 inode->i_flags |= S_NOSEC;
2729 #endif /* __KERNEL__ */
2730 #endif /* _LINUX_FS_H */