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/rbtree.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>
417 #include <linux/lockdep.h>
419 #include <asm/byteorder.h>
421 struct export_operations;
427 struct pipe_inode_info;
428 struct poll_table_struct;
430 struct vm_area_struct;
433 struct swap_info_struct;
435 extern void __init inode_init(void);
436 extern void __init inode_init_early(void);
437 extern void __init files_init(unsigned long);
439 extern struct files_stat_struct files_stat;
440 extern unsigned long get_max_files(void);
441 extern int sysctl_nr_open;
442 extern struct inodes_stat_t inodes_stat;
443 extern int leases_enable, lease_break_time;
444 extern int sysctl_protected_symlinks;
445 extern int sysctl_protected_hardlinks;
448 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
449 struct buffer_head *bh_result, int create);
450 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
451 ssize_t bytes, void *private, int ret,
455 * Attribute flags. These should be or-ed together to figure out what
458 #define ATTR_MODE (1 << 0)
459 #define ATTR_UID (1 << 1)
460 #define ATTR_GID (1 << 2)
461 #define ATTR_SIZE (1 << 3)
462 #define ATTR_ATIME (1 << 4)
463 #define ATTR_MTIME (1 << 5)
464 #define ATTR_CTIME (1 << 6)
465 #define ATTR_ATIME_SET (1 << 7)
466 #define ATTR_MTIME_SET (1 << 8)
467 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
468 #define ATTR_ATTR_FLAG (1 << 10)
469 #define ATTR_KILL_SUID (1 << 11)
470 #define ATTR_KILL_SGID (1 << 12)
471 #define ATTR_FILE (1 << 13)
472 #define ATTR_KILL_PRIV (1 << 14)
473 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
474 #define ATTR_TIMES_SET (1 << 16)
477 * This is the Inode Attributes structure, used for notify_change(). It
478 * uses the above definitions as flags, to know which values have changed.
479 * Also, in this manner, a Filesystem can look at only the values it cares
480 * about. Basically, these are the attributes that the VFS layer can
481 * request to change from the FS layer.
483 * Derek Atkins <warlord@MIT.EDU> 94-10-20
486 unsigned int ia_valid;
491 struct timespec ia_atime;
492 struct timespec ia_mtime;
493 struct timespec ia_ctime;
496 * Not an attribute, but an auxiliary info for filesystems wanting to
497 * implement an ftruncate() like method. NOTE: filesystem should
498 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
500 struct file *ia_file;
504 * Includes for diskquotas.
506 #include <linux/quota.h>
509 * enum positive_aop_returns - aop return codes with specific semantics
511 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
512 * completed, that the page is still locked, and
513 * should be considered active. The VM uses this hint
514 * to return the page to the active list -- it won't
515 * be a candidate for writeback again in the near
516 * future. Other callers must be careful to unlock
517 * the page if they get this return. Returned by
520 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
521 * unlocked it and the page might have been truncated.
522 * The caller should back up to acquiring a new page and
523 * trying again. The aop will be taking reasonable
524 * precautions not to livelock. If the caller held a page
525 * reference, it should drop it before retrying. Returned
528 * address_space_operation functions return these large constants to indicate
529 * special semantics to the caller. These are much larger than the bytes in a
530 * page to allow for functions that return the number of bytes operated on in a
534 enum positive_aop_returns {
535 AOP_WRITEPAGE_ACTIVATE = 0x80000,
536 AOP_TRUNCATED_PAGE = 0x80001,
539 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
540 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
541 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
542 * helper code (eg buffer layer)
543 * to clear GFP_FS from alloc */
546 * oh the beauties of C type declarations.
549 struct address_space;
550 struct writeback_control;
553 const struct iovec *iov;
554 unsigned long nr_segs;
559 size_t iov_iter_copy_from_user_atomic(struct page *page,
560 struct iov_iter *i, unsigned long offset, size_t bytes);
561 size_t iov_iter_copy_from_user(struct page *page,
562 struct iov_iter *i, unsigned long offset, size_t bytes);
563 void iov_iter_advance(struct iov_iter *i, size_t bytes);
564 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
565 size_t iov_iter_single_seg_count(struct iov_iter *i);
567 static inline void iov_iter_init(struct iov_iter *i,
568 const struct iovec *iov, unsigned long nr_segs,
569 size_t count, size_t written)
572 i->nr_segs = nr_segs;
574 i->count = count + written;
576 iov_iter_advance(i, written);
579 static inline size_t iov_iter_count(struct iov_iter *i)
585 * "descriptor" for what we're up to with a read.
586 * This allows us to use the same read code yet
587 * have multiple different users of the data that
588 * we read from a file.
590 * The simplest case just copies the data to user
603 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
604 unsigned long, unsigned long);
606 struct address_space_operations {
607 int (*writepage)(struct page *page, struct writeback_control *wbc);
608 int (*readpage)(struct file *, struct page *);
610 /* Write back some dirty pages from this mapping. */
611 int (*writepages)(struct address_space *, struct writeback_control *);
613 /* Set a page dirty. Return true if this dirtied it */
614 int (*set_page_dirty)(struct page *page);
616 int (*readpages)(struct file *filp, struct address_space *mapping,
617 struct list_head *pages, unsigned nr_pages);
619 int (*write_begin)(struct file *, struct address_space *mapping,
620 loff_t pos, unsigned len, unsigned flags,
621 struct page **pagep, void **fsdata);
622 int (*write_end)(struct file *, struct address_space *mapping,
623 loff_t pos, unsigned len, unsigned copied,
624 struct page *page, void *fsdata);
626 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
627 sector_t (*bmap)(struct address_space *, sector_t);
628 void (*invalidatepage) (struct page *, unsigned long);
629 int (*releasepage) (struct page *, gfp_t);
630 void (*freepage)(struct page *);
631 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
632 loff_t offset, unsigned long nr_segs);
633 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
634 void **, unsigned long *);
636 * migrate the contents of a page to the specified target. If sync
637 * is false, it must not block.
639 int (*migratepage) (struct address_space *,
640 struct page *, struct page *, enum migrate_mode);
641 int (*launder_page) (struct page *);
642 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
644 int (*error_remove_page)(struct address_space *, struct page *);
646 /* swapfile support */
647 int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
649 void (*swap_deactivate)(struct file *file);
652 extern const struct address_space_operations empty_aops;
655 * pagecache_write_begin/pagecache_write_end must be used by general code
656 * to write into the pagecache.
658 int pagecache_write_begin(struct file *, struct address_space *mapping,
659 loff_t pos, unsigned len, unsigned flags,
660 struct page **pagep, void **fsdata);
662 int pagecache_write_end(struct file *, struct address_space *mapping,
663 loff_t pos, unsigned len, unsigned copied,
664 struct page *page, void *fsdata);
666 struct backing_dev_info;
667 struct address_space {
668 struct inode *host; /* owner: inode, block_device */
669 struct radix_tree_root page_tree; /* radix tree of all pages */
670 spinlock_t tree_lock; /* and lock protecting it */
671 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
672 struct rb_root i_mmap; /* tree of private and shared mappings */
673 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
674 struct mutex i_mmap_mutex; /* protect tree, count, list */
675 /* Protected by tree_lock together with the radix tree */
676 unsigned long nrpages; /* number of total pages */
677 pgoff_t writeback_index;/* writeback starts here */
678 const struct address_space_operations *a_ops; /* methods */
679 unsigned long flags; /* error bits/gfp mask */
680 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
681 spinlock_t private_lock; /* for use by the address_space */
682 struct list_head private_list; /* ditto */
683 struct address_space *assoc_mapping; /* ditto */
684 } __attribute__((aligned(sizeof(long))));
686 * On most architectures that alignment is already the case; but
687 * must be enforced here for CRIS, to let the least significant bit
688 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
690 struct request_queue;
692 struct block_device {
693 dev_t bd_dev; /* not a kdev_t - it's a search key */
695 struct inode * bd_inode; /* will die */
696 struct super_block * bd_super;
697 struct mutex bd_mutex; /* open/close mutex */
698 struct list_head bd_inodes;
702 bool bd_write_holder;
704 struct list_head bd_holder_disks;
706 struct block_device * bd_contains;
707 unsigned bd_block_size;
708 struct hd_struct * bd_part;
709 /* number of times partitions within this device have been opened. */
710 unsigned bd_part_count;
712 struct gendisk * bd_disk;
713 struct request_queue * bd_queue;
714 struct list_head bd_list;
716 * Private data. You must have bd_claim'ed the block_device
717 * to use this. NOTE: bd_claim allows an owner to claim
718 * the same device multiple times, the owner must take special
719 * care to not mess up bd_private for that case.
721 unsigned long bd_private;
723 /* The counter of freeze processes */
724 int bd_fsfreeze_count;
725 /* Mutex for freeze */
726 struct mutex bd_fsfreeze_mutex;
730 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
733 #define PAGECACHE_TAG_DIRTY 0
734 #define PAGECACHE_TAG_WRITEBACK 1
735 #define PAGECACHE_TAG_TOWRITE 2
737 int mapping_tagged(struct address_space *mapping, int tag);
740 * Might pages of this file be mapped into userspace?
742 static inline int mapping_mapped(struct address_space *mapping)
744 return !RB_EMPTY_ROOT(&mapping->i_mmap) ||
745 !list_empty(&mapping->i_mmap_nonlinear);
749 * Might pages of this file have been modified in userspace?
750 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
751 * marks vma as VM_SHARED if it is shared, and the file was opened for
752 * writing i.e. vma may be mprotected writable even if now readonly.
754 static inline int mapping_writably_mapped(struct address_space *mapping)
756 return mapping->i_mmap_writable != 0;
760 * Use sequence counter to get consistent i_size on 32-bit processors.
762 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
763 #include <linux/seqlock.h>
764 #define __NEED_I_SIZE_ORDERED
765 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
767 #define i_size_ordered_init(inode) do { } while (0)
771 #define ACL_NOT_CACHED ((void *)(-1))
773 #define IOP_FASTPERM 0x0001
774 #define IOP_LOOKUP 0x0002
775 #define IOP_NOFOLLOW 0x0004
778 * Keep mostly read-only and often accessed (especially for
779 * the RCU path lookup and 'stat' data) fields at the beginning
780 * of the 'struct inode'
784 unsigned short i_opflags;
787 unsigned int i_flags;
789 #ifdef CONFIG_FS_POSIX_ACL
790 struct posix_acl *i_acl;
791 struct posix_acl *i_default_acl;
794 const struct inode_operations *i_op;
795 struct super_block *i_sb;
796 struct address_space *i_mapping;
798 #ifdef CONFIG_SECURITY
802 /* Stat data, not accessed from path walking */
805 * Filesystems may only read i_nlink directly. They shall use the
806 * following functions for modification:
808 * (set|clear|inc|drop)_nlink
809 * inode_(inc|dec)_link_count
812 const unsigned int i_nlink;
813 unsigned int __i_nlink;
817 struct timespec i_atime;
818 struct timespec i_mtime;
819 struct timespec i_ctime;
820 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
821 unsigned short i_bytes;
822 unsigned int i_blkbits;
825 #ifdef __NEED_I_SIZE_ORDERED
826 seqcount_t i_size_seqcount;
830 unsigned long i_state;
831 struct mutex i_mutex;
833 unsigned long dirtied_when; /* jiffies of first dirtying */
835 struct hlist_node i_hash;
836 struct list_head i_wb_list; /* backing dev IO list */
837 struct list_head i_lru; /* inode LRU list */
838 struct list_head i_sb_list;
840 struct hlist_head i_dentry;
841 struct rcu_head i_rcu;
845 atomic_t i_dio_count;
846 atomic_t i_writecount;
847 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
848 struct file_lock *i_flock;
849 struct address_space i_data;
851 struct dquot *i_dquot[MAXQUOTAS];
853 struct list_head i_devices;
855 struct pipe_inode_info *i_pipe;
856 struct block_device *i_bdev;
862 #ifdef CONFIG_FSNOTIFY
863 __u32 i_fsnotify_mask; /* all events this inode cares about */
864 struct hlist_head i_fsnotify_marks;
868 atomic_t i_readcount; /* struct files open RO */
870 void *i_private; /* fs or device private pointer */
873 static inline int inode_unhashed(struct inode *inode)
875 return hlist_unhashed(&inode->i_hash);
879 * inode->i_mutex nesting subclasses for the lock validator:
881 * 0: the object of the current VFS operation
886 * The locking order between these classes is
887 * parent -> child -> normal -> xattr -> quota
889 enum inode_i_mutex_lock_class
899 * NOTE: in a 32bit arch with a preemptable kernel and
900 * an UP compile the i_size_read/write must be atomic
901 * with respect to the local cpu (unlike with preempt disabled),
902 * but they don't need to be atomic with respect to other cpus like in
903 * true SMP (so they need either to either locally disable irq around
904 * the read or for example on x86 they can be still implemented as a
905 * cmpxchg8b without the need of the lock prefix). For SMP compiles
906 * and 64bit archs it makes no difference if preempt is enabled or not.
908 static inline loff_t i_size_read(const struct inode *inode)
910 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
915 seq = read_seqcount_begin(&inode->i_size_seqcount);
916 i_size = inode->i_size;
917 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
919 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
923 i_size = inode->i_size;
927 return inode->i_size;
932 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
933 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
934 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
936 static inline void i_size_write(struct inode *inode, loff_t i_size)
938 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
939 write_seqcount_begin(&inode->i_size_seqcount);
940 inode->i_size = i_size;
941 write_seqcount_end(&inode->i_size_seqcount);
942 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
944 inode->i_size = i_size;
947 inode->i_size = i_size;
951 /* Helper functions so that in most cases filesystems will
952 * not need to deal directly with kuid_t and kgid_t and can
953 * instead deal with the raw numeric values that are stored
956 static inline uid_t i_uid_read(const struct inode *inode)
958 return from_kuid(&init_user_ns, inode->i_uid);
961 static inline gid_t i_gid_read(const struct inode *inode)
963 return from_kgid(&init_user_ns, inode->i_gid);
966 static inline void i_uid_write(struct inode *inode, uid_t uid)
968 inode->i_uid = make_kuid(&init_user_ns, uid);
971 static inline void i_gid_write(struct inode *inode, gid_t gid)
973 inode->i_gid = make_kgid(&init_user_ns, gid);
976 static inline unsigned iminor(const struct inode *inode)
978 return MINOR(inode->i_rdev);
981 static inline unsigned imajor(const struct inode *inode)
983 return MAJOR(inode->i_rdev);
986 extern struct block_device *I_BDEV(struct inode *inode);
989 rwlock_t lock; /* protects pid, uid, euid fields */
990 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
991 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
992 kuid_t uid, euid; /* uid/euid of process setting the owner */
993 int signum; /* posix.1b rt signal to be delivered on IO */
997 * Track a single file's readahead state
999 struct file_ra_state {
1000 pgoff_t start; /* where readahead started */
1001 unsigned int size; /* # of readahead pages */
1002 unsigned int async_size; /* do asynchronous readahead when
1003 there are only # of pages ahead */
1005 unsigned int ra_pages; /* Maximum readahead window */
1006 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
1007 loff_t prev_pos; /* Cache last read() position */
1011 * Check if @index falls in the readahead windows.
1013 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
1015 return (index >= ra->start &&
1016 index < ra->start + ra->size);
1019 #define FILE_MNT_WRITE_TAKEN 1
1020 #define FILE_MNT_WRITE_RELEASED 2
1024 * fu_list becomes invalid after file_free is called and queued via
1025 * fu_rcuhead for RCU freeing
1028 struct list_head fu_list;
1029 struct rcu_head fu_rcuhead;
1032 #define f_dentry f_path.dentry
1033 #define f_vfsmnt f_path.mnt
1034 const struct file_operations *f_op;
1037 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
1038 * Must not be taken from IRQ context.
1044 atomic_long_t f_count;
1045 unsigned int f_flags;
1048 struct fown_struct f_owner;
1049 const struct cred *f_cred;
1050 struct file_ra_state f_ra;
1053 #ifdef CONFIG_SECURITY
1056 /* needed for tty driver, and maybe others */
1060 /* Used by fs/eventpoll.c to link all the hooks to this file */
1061 struct list_head f_ep_links;
1062 struct list_head f_tfile_llink;
1063 #endif /* #ifdef CONFIG_EPOLL */
1064 struct address_space *f_mapping;
1065 #ifdef CONFIG_DEBUG_WRITECOUNT
1066 unsigned long f_mnt_write_state;
1070 struct file_handle {
1073 /* file identifier */
1074 unsigned char f_handle[0];
1077 static inline struct file *get_file(struct file *f)
1079 atomic_long_inc(&f->f_count);
1082 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
1083 #define file_count(x) atomic_long_read(&(x)->f_count)
1085 #ifdef CONFIG_DEBUG_WRITECOUNT
1086 static inline void file_take_write(struct file *f)
1088 WARN_ON(f->f_mnt_write_state != 0);
1089 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
1091 static inline void file_release_write(struct file *f)
1093 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
1095 static inline void file_reset_write(struct file *f)
1097 f->f_mnt_write_state = 0;
1099 static inline void file_check_state(struct file *f)
1102 * At this point, either both or neither of these bits
1105 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
1106 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
1108 static inline int file_check_writeable(struct file *f)
1110 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
1112 printk(KERN_WARNING "writeable file with no "
1113 "mnt_want_write()\n");
1117 #else /* !CONFIG_DEBUG_WRITECOUNT */
1118 static inline void file_take_write(struct file *filp) {}
1119 static inline void file_release_write(struct file *filp) {}
1120 static inline void file_reset_write(struct file *filp) {}
1121 static inline void file_check_state(struct file *filp) {}
1122 static inline int file_check_writeable(struct file *filp)
1126 #endif /* CONFIG_DEBUG_WRITECOUNT */
1128 #define MAX_NON_LFS ((1UL<<31) - 1)
1130 /* Page cache limit. The filesystems should put that into their s_maxbytes
1131 limits, otherwise bad things can happen in VM. */
1132 #if BITS_PER_LONG==32
1133 #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1134 #elif BITS_PER_LONG==64
1135 #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
1140 #define FL_ACCESS 8 /* not trying to lock, just looking */
1141 #define FL_EXISTS 16 /* when unlocking, test for existence */
1142 #define FL_LEASE 32 /* lease held on this file */
1143 #define FL_CLOSE 64 /* unlock on close */
1144 #define FL_SLEEP 128 /* A blocking lock */
1145 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
1146 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
1149 * Special return value from posix_lock_file() and vfs_lock_file() for
1150 * asynchronous locking.
1152 #define FILE_LOCK_DEFERRED 1
1155 * The POSIX file lock owner is determined by
1156 * the "struct files_struct" in the thread group
1157 * (or NULL for no owner - BSD locks).
1159 * Lockd stuffs a "host" pointer into this.
1161 typedef struct files_struct *fl_owner_t;
1163 struct file_lock_operations {
1164 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1165 void (*fl_release_private)(struct file_lock *);
1168 struct lock_manager_operations {
1169 int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
1170 void (*lm_notify)(struct file_lock *); /* unblock callback */
1171 int (*lm_grant)(struct file_lock *, struct file_lock *, int);
1172 void (*lm_break)(struct file_lock *);
1173 int (*lm_change)(struct file_lock **, int);
1176 struct lock_manager {
1177 struct list_head list;
1181 void locks_start_grace(struct net *, struct lock_manager *);
1182 void locks_end_grace(struct lock_manager *);
1183 int locks_in_grace(struct net *);
1185 /* that will die - we need it for nfs_lock_info */
1186 #include <linux/nfs_fs_i.h>
1189 struct file_lock *fl_next; /* singly linked list for this inode */
1190 struct list_head fl_link; /* doubly linked list of all locks */
1191 struct list_head fl_block; /* circular list of blocked processes */
1192 fl_owner_t fl_owner;
1193 unsigned int fl_flags;
1194 unsigned char fl_type;
1195 unsigned int fl_pid;
1196 struct pid *fl_nspid;
1197 wait_queue_head_t fl_wait;
1198 struct file *fl_file;
1202 struct fasync_struct * fl_fasync; /* for lease break notifications */
1203 /* for lease breaks: */
1204 unsigned long fl_break_time;
1205 unsigned long fl_downgrade_time;
1207 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1208 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1210 struct nfs_lock_info nfs_fl;
1211 struct nfs4_lock_info nfs4_fl;
1213 struct list_head link; /* link in AFS vnode's pending_locks list */
1214 int state; /* state of grant or error if -ve */
1219 /* The following constant reflects the upper bound of the file/locking space */
1221 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1222 #define OFFSET_MAX INT_LIMIT(loff_t)
1223 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1226 #include <linux/fcntl.h>
1228 extern void send_sigio(struct fown_struct *fown, int fd, int band);
1230 #ifdef CONFIG_FILE_LOCKING
1231 extern int fcntl_getlk(struct file *, struct flock __user *);
1232 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1233 struct flock __user *);
1235 #if BITS_PER_LONG == 32
1236 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1237 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1238 struct flock64 __user *);
1241 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1242 extern int fcntl_getlease(struct file *filp);
1245 void locks_free_lock(struct file_lock *fl);
1246 extern void locks_init_lock(struct file_lock *);
1247 extern struct file_lock * locks_alloc_lock(void);
1248 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1249 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1250 extern void locks_remove_posix(struct file *, fl_owner_t);
1251 extern void locks_remove_flock(struct file *);
1252 extern void locks_release_private(struct file_lock *);
1253 extern void posix_test_lock(struct file *, struct file_lock *);
1254 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1255 extern int posix_lock_file_wait(struct file *, struct file_lock *);
1256 extern int posix_unblock_lock(struct file *, struct file_lock *);
1257 extern int vfs_test_lock(struct file *, struct file_lock *);
1258 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
1259 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1260 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1261 extern int __break_lease(struct inode *inode, unsigned int flags);
1262 extern void lease_get_mtime(struct inode *, struct timespec *time);
1263 extern int generic_setlease(struct file *, long, struct file_lock **);
1264 extern int vfs_setlease(struct file *, long, struct file_lock **);
1265 extern int lease_modify(struct file_lock **, int);
1266 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1267 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1268 extern void locks_delete_block(struct file_lock *waiter);
1269 extern void lock_flocks(void);
1270 extern void unlock_flocks(void);
1271 #else /* !CONFIG_FILE_LOCKING */
1272 static inline int fcntl_getlk(struct file *file, struct flock __user *user)
1277 static inline int fcntl_setlk(unsigned int fd, struct file *file,
1278 unsigned int cmd, struct flock __user *user)
1283 #if BITS_PER_LONG == 32
1284 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
1289 static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1290 unsigned int cmd, struct flock64 __user *user)
1295 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1300 static inline int fcntl_getlease(struct file *filp)
1305 static inline void locks_init_lock(struct file_lock *fl)
1310 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1315 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1320 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1325 static inline void locks_remove_flock(struct file *filp)
1330 static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1335 static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1336 struct file_lock *conflock)
1341 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
1346 static inline int posix_unblock_lock(struct file *filp,
1347 struct file_lock *waiter)
1352 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1357 static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1358 struct file_lock *fl, struct file_lock *conf)
1363 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1368 static inline int flock_lock_file_wait(struct file *filp,
1369 struct file_lock *request)
1374 static inline int __break_lease(struct inode *inode, unsigned int mode)
1379 static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1384 static inline int generic_setlease(struct file *filp, long arg,
1385 struct file_lock **flp)
1390 static inline int vfs_setlease(struct file *filp, long arg,
1391 struct file_lock **lease)
1396 static inline int lease_modify(struct file_lock **before, int arg)
1401 static inline int lock_may_read(struct inode *inode, loff_t start,
1407 static inline int lock_may_write(struct inode *inode, loff_t start,
1413 static inline void locks_delete_block(struct file_lock *waiter)
1417 static inline void lock_flocks(void)
1421 static inline void unlock_flocks(void)
1425 #endif /* !CONFIG_FILE_LOCKING */
1428 struct fasync_struct {
1432 struct fasync_struct *fa_next; /* singly linked list */
1433 struct file *fa_file;
1434 struct rcu_head fa_rcu;
1437 #define FASYNC_MAGIC 0x4601
1439 /* SMP safe fasync helpers: */
1440 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1441 extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
1442 extern int fasync_remove_entry(struct file *, struct fasync_struct **);
1443 extern struct fasync_struct *fasync_alloc(void);
1444 extern void fasync_free(struct fasync_struct *);
1446 /* can be called from interrupts */
1447 extern void kill_fasync(struct fasync_struct **, int, int);
1449 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1450 extern int f_setown(struct file *filp, unsigned long arg, int force);
1451 extern void f_delown(struct file *filp);
1452 extern pid_t f_getown(struct file *filp);
1453 extern int send_sigurg(struct fown_struct *fown);
1461 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1462 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1463 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1464 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1465 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1467 extern struct list_head super_blocks;
1468 extern spinlock_t sb_lock;
1470 /* Possible states of 'frozen' field */
1472 SB_UNFROZEN = 0, /* FS is unfrozen */
1473 SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
1474 SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
1475 SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop
1476 * internal threads if needed) */
1477 SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
1480 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1483 /* Counters for counting writers at each level */
1484 struct percpu_counter counter[SB_FREEZE_LEVELS];
1485 wait_queue_head_t wait; /* queue for waiting for
1486 writers / faults to finish */
1487 int frozen; /* Is sb frozen? */
1488 wait_queue_head_t wait_unfrozen; /* queue for waiting for
1490 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1491 struct lockdep_map lock_map[SB_FREEZE_LEVELS];
1495 struct super_block {
1496 struct list_head s_list; /* Keep this first */
1497 dev_t s_dev; /* search index; _not_ kdev_t */
1498 unsigned char s_blocksize_bits;
1499 unsigned long s_blocksize;
1500 loff_t s_maxbytes; /* Max file size */
1501 struct file_system_type *s_type;
1502 const struct super_operations *s_op;
1503 const struct dquot_operations *dq_op;
1504 const struct quotactl_ops *s_qcop;
1505 const struct export_operations *s_export_op;
1506 unsigned long s_flags;
1507 unsigned long s_magic;
1508 struct dentry *s_root;
1509 struct rw_semaphore s_umount;
1512 #ifdef CONFIG_SECURITY
1515 const struct xattr_handler **s_xattr;
1517 struct list_head s_inodes; /* all inodes */
1518 struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */
1520 struct list_head __percpu *s_files;
1522 struct list_head s_files;
1524 struct list_head s_mounts; /* list of mounts; _not_ for fs use */
1525 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1526 struct list_head s_dentry_lru; /* unused dentry lru */
1527 int s_nr_dentry_unused; /* # of dentry on lru */
1529 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1530 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp;
1531 struct list_head s_inode_lru; /* unused inode lru */
1532 int s_nr_inodes_unused; /* # of inodes on lru */
1534 struct block_device *s_bdev;
1535 struct backing_dev_info *s_bdi;
1536 struct mtd_info *s_mtd;
1537 struct hlist_node s_instances;
1538 struct quota_info s_dquot; /* Diskquota specific options */
1540 struct sb_writers s_writers;
1542 char s_id[32]; /* Informational name */
1543 u8 s_uuid[16]; /* UUID */
1545 void *s_fs_info; /* Filesystem private info */
1546 unsigned int s_max_links;
1549 /* Granularity of c/m/atime in ns.
1550 Cannot be worse than a second */
1554 * The next field is for VFS *only*. No filesystems have any business
1555 * even looking at it. You had been warned.
1557 struct mutex s_vfs_rename_mutex; /* Kludge */
1560 * Filesystem subtype. If non-empty the filesystem type field
1561 * in /proc/mounts will be "type.subtype"
1566 * Saved mount options for lazy filesystems using
1567 * generic_show_options()
1569 char __rcu *s_options;
1570 const struct dentry_operations *s_d_op; /* default d_op for dentries */
1573 * Saved pool identifier for cleancache (-1 means none)
1575 int cleancache_poolid;
1577 struct shrinker s_shrink; /* per-sb shrinker handle */
1579 /* Number of inodes with nlink == 0 but still referenced */
1580 atomic_long_t s_remove_count;
1582 /* Being remounted read-only */
1583 int s_readonly_remount;
1586 /* superblock cache pruning functions */
1587 extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
1588 extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);
1590 extern struct timespec current_fs_time(struct super_block *sb);
1593 * Snapshotting support.
1596 void __sb_end_write(struct super_block *sb, int level);
1597 int __sb_start_write(struct super_block *sb, int level, bool wait);
1600 * sb_end_write - drop write access to a superblock
1601 * @sb: the super we wrote to
1603 * Decrement number of writers to the filesystem. Wake up possible waiters
1604 * wanting to freeze the filesystem.
1606 static inline void sb_end_write(struct super_block *sb)
1608 __sb_end_write(sb, SB_FREEZE_WRITE);
1612 * sb_end_pagefault - drop write access to a superblock from a page fault
1613 * @sb: the super we wrote to
1615 * Decrement number of processes handling write page fault to the filesystem.
1616 * Wake up possible waiters wanting to freeze the filesystem.
1618 static inline void sb_end_pagefault(struct super_block *sb)
1620 __sb_end_write(sb, SB_FREEZE_PAGEFAULT);
1624 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1625 * @sb: the super we wrote to
1627 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1628 * waiters wanting to freeze the filesystem.
1630 static inline void sb_end_intwrite(struct super_block *sb)
1632 __sb_end_write(sb, SB_FREEZE_FS);
1636 * sb_start_write - get write access to a superblock
1637 * @sb: the super we write to
1639 * When a process wants to write data or metadata to a file system (i.e. dirty
1640 * a page or an inode), it should embed the operation in a sb_start_write() -
1641 * sb_end_write() pair to get exclusion against file system freezing. This
1642 * function increments number of writers preventing freezing. If the file
1643 * system is already frozen, the function waits until the file system is
1646 * Since freeze protection behaves as a lock, users have to preserve
1647 * ordering of freeze protection and other filesystem locks. Generally,
1648 * freeze protection should be the outermost lock. In particular, we have:
1651 * -> i_mutex (write path, truncate, directory ops, ...)
1652 * -> s_umount (freeze_super, thaw_super)
1654 static inline void sb_start_write(struct super_block *sb)
1656 __sb_start_write(sb, SB_FREEZE_WRITE, true);
1659 static inline int sb_start_write_trylock(struct super_block *sb)
1661 return __sb_start_write(sb, SB_FREEZE_WRITE, false);
1665 * sb_start_pagefault - get write access to a superblock from a page fault
1666 * @sb: the super we write to
1668 * When a process starts handling write page fault, it should embed the
1669 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1670 * exclusion against file system freezing. This is needed since the page fault
1671 * is going to dirty a page. This function increments number of running page
1672 * faults preventing freezing. If the file system is already frozen, the
1673 * function waits until the file system is thawed.
1675 * Since page fault freeze protection behaves as a lock, users have to preserve
1676 * ordering of freeze protection and other filesystem locks. It is advised to
1677 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1678 * handling code implies lock dependency:
1681 * -> sb_start_pagefault
1683 static inline void sb_start_pagefault(struct super_block *sb)
1685 __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true);
1689 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1690 * @sb: the super we write to
1692 * This is the third level of protection against filesystem freezing. It is
1693 * free for use by a filesystem. The only requirement is that it must rank
1694 * below sb_start_pagefault.
1696 * For example filesystem can call sb_start_intwrite() when starting a
1697 * transaction which somewhat eases handling of freezing for internal sources
1698 * of filesystem changes (internal fs threads, discarding preallocation on file
1701 static inline void sb_start_intwrite(struct super_block *sb)
1703 __sb_start_write(sb, SB_FREEZE_FS, true);
1707 extern bool inode_owner_or_capable(const struct inode *inode);
1709 /* not quite ready to be deprecated, but... */
1710 extern void lock_super(struct super_block *);
1711 extern void unlock_super(struct super_block *);
1714 * VFS helper functions..
1716 extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
1717 extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
1718 extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1719 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
1720 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1721 extern int vfs_rmdir(struct inode *, struct dentry *);
1722 extern int vfs_unlink(struct inode *, struct dentry *);
1723 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1726 * VFS dentry helper functions.
1728 extern void dentry_unhash(struct dentry *dentry);
1731 * VFS file helper functions.
1733 extern void inode_init_owner(struct inode *inode, const struct inode *dir,
1736 * VFS FS_IOC_FIEMAP helper definitions.
1738 struct fiemap_extent_info {
1739 unsigned int fi_flags; /* Flags as passed from user */
1740 unsigned int fi_extents_mapped; /* Number of mapped extents */
1741 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1742 struct fiemap_extent __user *fi_extents_start; /* Start of
1743 fiemap_extent array */
1745 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1746 u64 phys, u64 len, u32 flags);
1747 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1752 * NOTE! These match bits 12..15 of stat.st_mode
1753 * (ie "(i_mode >> 12) & 15").
1755 #define DT_UNKNOWN 0
1766 * This is the "filldir" function type, used by readdir() to let
1767 * the kernel specify what kind of dirent layout it wants to have.
1768 * This allows the kernel to read directories into kernel space or
1769 * to have different dirent layouts depending on the binary type.
1771 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1772 struct block_device_operations;
1774 /* These macros are for out of kernel modules to test that
1775 * the kernel supports the unlocked_ioctl and compat_ioctl
1776 * fields in struct file_operations. */
1777 #define HAVE_COMPAT_IOCTL 1
1778 #define HAVE_UNLOCKED_IOCTL 1
1780 struct file_operations {
1781 struct module *owner;
1782 loff_t (*llseek) (struct file *, loff_t, int);
1783 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1784 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1785 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1786 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1787 int (*readdir) (struct file *, void *, filldir_t);
1788 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1789 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1790 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1791 int (*mmap) (struct file *, struct vm_area_struct *);
1792 int (*open) (struct inode *, struct file *);
1793 int (*flush) (struct file *, fl_owner_t id);
1794 int (*release) (struct inode *, struct file *);
1795 int (*fsync) (struct file *, loff_t, loff_t, int datasync);
1796 int (*aio_fsync) (struct kiocb *, int datasync);
1797 int (*fasync) (int, struct file *, int);
1798 int (*lock) (struct file *, int, struct file_lock *);
1799 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1800 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1801 int (*check_flags)(int);
1802 int (*flock) (struct file *, int, struct file_lock *);
1803 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1804 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1805 int (*setlease)(struct file *, long, struct file_lock **);
1806 long (*fallocate)(struct file *file, int mode, loff_t offset,
1810 struct inode_operations {
1811 struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1812 void * (*follow_link) (struct dentry *, struct nameidata *);
1813 int (*permission) (struct inode *, int);
1814 struct posix_acl * (*get_acl)(struct inode *, int);
1816 int (*readlink) (struct dentry *, char __user *,int);
1817 void (*put_link) (struct dentry *, struct nameidata *, void *);
1819 int (*create) (struct inode *,struct dentry *, umode_t, bool);
1820 int (*link) (struct dentry *,struct inode *,struct dentry *);
1821 int (*unlink) (struct inode *,struct dentry *);
1822 int (*symlink) (struct inode *,struct dentry *,const char *);
1823 int (*mkdir) (struct inode *,struct dentry *,umode_t);
1824 int (*rmdir) (struct inode *,struct dentry *);
1825 int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
1826 int (*rename) (struct inode *, struct dentry *,
1827 struct inode *, struct dentry *);
1828 void (*truncate) (struct inode *);
1829 int (*setattr) (struct dentry *, struct iattr *);
1830 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1831 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1832 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1833 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1834 int (*removexattr) (struct dentry *, const char *);
1835 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1837 int (*update_time)(struct inode *, struct timespec *, int);
1838 int (*atomic_open)(struct inode *, struct dentry *,
1839 struct file *, unsigned open_flag,
1840 umode_t create_mode, int *opened);
1841 } ____cacheline_aligned;
1845 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1846 unsigned long nr_segs, unsigned long fast_segs,
1847 struct iovec *fast_pointer,
1848 struct iovec **ret_pointer);
1850 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1851 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1852 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1853 unsigned long, loff_t *);
1854 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1855 unsigned long, loff_t *);
1857 struct super_operations {
1858 struct inode *(*alloc_inode)(struct super_block *sb);
1859 void (*destroy_inode)(struct inode *);
1861 void (*dirty_inode) (struct inode *, int flags);
1862 int (*write_inode) (struct inode *, struct writeback_control *wbc);
1863 int (*drop_inode) (struct inode *);
1864 void (*evict_inode) (struct inode *);
1865 void (*put_super) (struct super_block *);
1866 int (*sync_fs)(struct super_block *sb, int wait);
1867 int (*freeze_fs) (struct super_block *);
1868 int (*unfreeze_fs) (struct super_block *);
1869 int (*statfs) (struct dentry *, struct kstatfs *);
1870 int (*remount_fs) (struct super_block *, int *, char *);
1871 void (*umount_begin) (struct super_block *);
1873 int (*show_options)(struct seq_file *, struct dentry *);
1874 int (*show_devname)(struct seq_file *, struct dentry *);
1875 int (*show_path)(struct seq_file *, struct dentry *);
1876 int (*show_stats)(struct seq_file *, struct dentry *);
1878 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1879 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1881 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1882 int (*nr_cached_objects)(struct super_block *);
1883 void (*free_cached_objects)(struct super_block *, int);
1887 * Inode state bits. Protected by inode->i_lock
1889 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1890 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1892 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1893 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1894 * various stages of removing an inode.
1896 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1898 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1899 * fdatasync(). i_atime is the usual cause.
1900 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1901 * these changes separately from I_DIRTY_SYNC so that we
1902 * don't have to write inode on fdatasync() when only
1903 * mtime has changed in it.
1904 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1905 * I_NEW Serves as both a mutex and completion notification.
1906 * New inodes set I_NEW. If two processes both create
1907 * the same inode, one of them will release its inode and
1908 * wait for I_NEW to be released before returning.
1909 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1910 * also cause waiting on I_NEW, without I_NEW actually
1911 * being set. find_inode() uses this to prevent returning
1912 * nearly-dead inodes.
1913 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1914 * is zero. I_FREEING must be set when I_WILL_FREE is
1916 * I_FREEING Set when inode is about to be freed but still has dirty
1917 * pages or buffers attached or the inode itself is still
1919 * I_CLEAR Added by clear_inode(). In this state the inode is
1920 * clean and can be destroyed. Inode keeps I_FREEING.
1922 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1923 * prohibited for many purposes. iget() must wait for
1924 * the inode to be completely released, then create it
1925 * anew. Other functions will just ignore such inodes,
1926 * if appropriate. I_NEW is used for waiting.
1928 * I_SYNC Writeback of inode is running. The bit is set during
1929 * data writeback, and cleared with a wakeup on the bit
1930 * address once it is done. The bit is also used to pin
1931 * the inode in memory for flusher thread.
1933 * I_REFERENCED Marks the inode as recently references on the LRU list.
1935 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1937 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1939 #define I_DIRTY_SYNC (1 << 0)
1940 #define I_DIRTY_DATASYNC (1 << 1)
1941 #define I_DIRTY_PAGES (1 << 2)
1943 #define I_NEW (1 << __I_NEW)
1944 #define I_WILL_FREE (1 << 4)
1945 #define I_FREEING (1 << 5)
1946 #define I_CLEAR (1 << 6)
1948 #define I_SYNC (1 << __I_SYNC)
1949 #define I_REFERENCED (1 << 8)
1950 #define __I_DIO_WAKEUP 9
1951 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1953 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1955 extern void __mark_inode_dirty(struct inode *, int);
1956 static inline void mark_inode_dirty(struct inode *inode)
1958 __mark_inode_dirty(inode, I_DIRTY);
1961 static inline void mark_inode_dirty_sync(struct inode *inode)
1963 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1966 extern void inc_nlink(struct inode *inode);
1967 extern void drop_nlink(struct inode *inode);
1968 extern void clear_nlink(struct inode *inode);
1969 extern void set_nlink(struct inode *inode, unsigned int nlink);
1971 static inline void inode_inc_link_count(struct inode *inode)
1974 mark_inode_dirty(inode);
1977 static inline void inode_dec_link_count(struct inode *inode)
1980 mark_inode_dirty(inode);
1984 * inode_inc_iversion - increments i_version
1985 * @inode: inode that need to be updated
1987 * Every time the inode is modified, the i_version field will be incremented.
1988 * The filesystem has to be mounted with i_version flag
1991 static inline void inode_inc_iversion(struct inode *inode)
1993 spin_lock(&inode->i_lock);
1995 spin_unlock(&inode->i_lock);
1998 enum file_time_flags {
2005 extern void touch_atime(struct path *);
2006 static inline void file_accessed(struct file *file)
2008 if (!(file->f_flags & O_NOATIME))
2009 touch_atime(&file->f_path);
2012 int sync_inode(struct inode *inode, struct writeback_control *wbc);
2013 int sync_inode_metadata(struct inode *inode, int wait);
2015 struct file_system_type {
2018 struct dentry *(*mount) (struct file_system_type *, int,
2019 const char *, void *);
2020 void (*kill_sb) (struct super_block *);
2021 struct module *owner;
2022 struct file_system_type * next;
2023 struct hlist_head fs_supers;
2025 struct lock_class_key s_lock_key;
2026 struct lock_class_key s_umount_key;
2027 struct lock_class_key s_vfs_rename_key;
2028 struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
2030 struct lock_class_key i_lock_key;
2031 struct lock_class_key i_mutex_key;
2032 struct lock_class_key i_mutex_dir_key;
2035 extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
2036 void *data, int (*fill_super)(struct super_block *, void *, int));
2037 extern struct dentry *mount_bdev(struct file_system_type *fs_type,
2038 int flags, const char *dev_name, void *data,
2039 int (*fill_super)(struct super_block *, void *, int));
2040 extern struct dentry *mount_single(struct file_system_type *fs_type,
2041 int flags, void *data,
2042 int (*fill_super)(struct super_block *, void *, int));
2043 extern struct dentry *mount_nodev(struct file_system_type *fs_type,
2044 int flags, void *data,
2045 int (*fill_super)(struct super_block *, void *, int));
2046 extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
2047 void generic_shutdown_super(struct super_block *sb);
2048 void kill_block_super(struct super_block *sb);
2049 void kill_anon_super(struct super_block *sb);
2050 void kill_litter_super(struct super_block *sb);
2051 void deactivate_super(struct super_block *sb);
2052 void deactivate_locked_super(struct super_block *sb);
2053 int set_anon_super(struct super_block *s, void *data);
2054 int get_anon_bdev(dev_t *);
2055 void free_anon_bdev(dev_t);
2056 struct super_block *sget(struct file_system_type *type,
2057 int (*test)(struct super_block *,void *),
2058 int (*set)(struct super_block *,void *),
2059 int flags, void *data);
2060 extern struct dentry *mount_pseudo(struct file_system_type *, char *,
2061 const struct super_operations *ops,
2062 const struct dentry_operations *dops,
2065 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
2066 #define fops_get(fops) \
2067 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
2068 #define fops_put(fops) \
2069 do { if (fops) module_put((fops)->owner); } while(0)
2071 extern int register_filesystem(struct file_system_type *);
2072 extern int unregister_filesystem(struct file_system_type *);
2073 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
2074 #define kern_mount(type) kern_mount_data(type, NULL)
2075 extern void kern_unmount(struct vfsmount *mnt);
2076 extern int may_umount_tree(struct vfsmount *);
2077 extern int may_umount(struct vfsmount *);
2078 extern long do_mount(const char *, const char *, const char *, unsigned long, void *);
2079 extern struct vfsmount *collect_mounts(struct path *);
2080 extern void drop_collected_mounts(struct vfsmount *);
2081 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
2083 extern int vfs_statfs(struct path *, struct kstatfs *);
2084 extern int user_statfs(const char __user *, struct kstatfs *);
2085 extern int fd_statfs(int, struct kstatfs *);
2086 extern int vfs_ustat(dev_t, struct kstatfs *);
2087 extern int freeze_super(struct super_block *super);
2088 extern int thaw_super(struct super_block *super);
2089 extern bool our_mnt(struct vfsmount *mnt);
2091 extern int current_umask(void);
2094 extern struct kobject *fs_kobj;
2096 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
2097 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
2099 #define FLOCK_VERIFY_READ 1
2100 #define FLOCK_VERIFY_WRITE 2
2102 #ifdef CONFIG_FILE_LOCKING
2103 extern int locks_mandatory_locked(struct inode *);
2104 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
2107 * Candidates for mandatory locking have the setgid bit set
2108 * but no group execute bit - an otherwise meaningless combination.
2111 static inline int __mandatory_lock(struct inode *ino)
2113 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
2117 * ... and these candidates should be on MS_MANDLOCK mounted fs,
2118 * otherwise these will be advisory locks
2121 static inline int mandatory_lock(struct inode *ino)
2123 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
2126 static inline int locks_verify_locked(struct inode *inode)
2128 if (mandatory_lock(inode))
2129 return locks_mandatory_locked(inode);
2133 static inline int locks_verify_truncate(struct inode *inode,
2137 if (inode->i_flock && mandatory_lock(inode))
2138 return locks_mandatory_area(
2139 FLOCK_VERIFY_WRITE, inode, filp,
2140 size < inode->i_size ? size : inode->i_size,
2141 (size < inode->i_size ? inode->i_size - size
2142 : size - inode->i_size)
2147 static inline int break_lease(struct inode *inode, unsigned int mode)
2150 return __break_lease(inode, mode);
2153 #else /* !CONFIG_FILE_LOCKING */
2154 static inline int locks_mandatory_locked(struct inode *inode)
2159 static inline int locks_mandatory_area(int rw, struct inode *inode,
2160 struct file *filp, loff_t offset,
2166 static inline int __mandatory_lock(struct inode *inode)
2171 static inline int mandatory_lock(struct inode *inode)
2176 static inline int locks_verify_locked(struct inode *inode)
2181 static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
2187 static inline int break_lease(struct inode *inode, unsigned int mode)
2192 #endif /* CONFIG_FILE_LOCKING */
2196 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
2198 extern int do_fallocate(struct file *file, int mode, loff_t offset,
2200 extern long do_sys_open(int dfd, const char __user *filename, int flags,
2202 extern struct file *filp_open(const char *, int, umode_t);
2203 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
2205 extern struct file * dentry_open(const struct path *, int, const struct cred *);
2206 extern int filp_close(struct file *, fl_owner_t id);
2207 extern char * getname(const char __user *);
2212 extern int finish_open(struct file *file, struct dentry *dentry,
2213 int (*open)(struct inode *, struct file *),
2215 extern int finish_no_open(struct file *file, struct dentry *dentry);
2219 extern int ioctl_preallocate(struct file *filp, void __user *argp);
2222 extern void __init vfs_caches_init_early(void);
2223 extern void __init vfs_caches_init(unsigned long);
2225 extern struct kmem_cache *names_cachep;
2227 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
2228 #define __getname() __getname_gfp(GFP_KERNEL)
2229 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2230 #ifndef CONFIG_AUDITSYSCALL
2231 #define putname(name) __putname(name)
2233 extern void putname(const char *name);
2237 extern int register_blkdev(unsigned int, const char *);
2238 extern void unregister_blkdev(unsigned int, const char *);
2239 extern struct block_device *bdget(dev_t);
2240 extern struct block_device *bdgrab(struct block_device *bdev);
2241 extern void bd_set_size(struct block_device *, loff_t size);
2242 extern sector_t blkdev_max_block(struct block_device *bdev);
2243 extern void bd_forget(struct inode *inode);
2244 extern void bdput(struct block_device *);
2245 extern void invalidate_bdev(struct block_device *);
2246 extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
2247 extern int sync_blockdev(struct block_device *bdev);
2248 extern void kill_bdev(struct block_device *);
2249 extern struct super_block *freeze_bdev(struct block_device *);
2250 extern void emergency_thaw_all(void);
2251 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
2252 extern int fsync_bdev(struct block_device *);
2254 static inline void bd_forget(struct inode *inode) {}
2255 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
2256 static inline void kill_bdev(struct block_device *bdev) {}
2257 static inline void invalidate_bdev(struct block_device *bdev) {}
2259 static inline struct super_block *freeze_bdev(struct block_device *sb)
2264 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
2269 static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
2273 extern int sync_filesystem(struct super_block *);
2274 extern const struct file_operations def_blk_fops;
2275 extern const struct file_operations def_chr_fops;
2276 extern const struct file_operations bad_sock_fops;
2277 extern const struct file_operations def_fifo_fops;
2279 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2280 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
2281 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2282 extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2283 extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
2285 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
2287 extern int blkdev_put(struct block_device *bdev, fmode_t mode);
2289 extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2290 extern void bd_unlink_disk_holder(struct block_device *bdev,
2291 struct gendisk *disk);
2293 static inline int bd_link_disk_holder(struct block_device *bdev,
2294 struct gendisk *disk)
2298 static inline void bd_unlink_disk_holder(struct block_device *bdev,
2299 struct gendisk *disk)
2306 #define CHRDEV_MAJOR_HASH_SIZE 255
2307 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
2308 extern int register_chrdev_region(dev_t, unsigned, const char *);
2309 extern int __register_chrdev(unsigned int major, unsigned int baseminor,
2310 unsigned int count, const char *name,
2311 const struct file_operations *fops);
2312 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
2313 unsigned int count, const char *name);
2314 extern void unregister_chrdev_region(dev_t, unsigned);
2315 extern void chrdev_show(struct seq_file *,off_t);
2317 static inline int register_chrdev(unsigned int major, const char *name,
2318 const struct file_operations *fops)
2320 return __register_chrdev(major, 0, 256, name, fops);
2323 static inline void unregister_chrdev(unsigned int major, const char *name)
2325 __unregister_chrdev(major, 0, 256, name);
2328 /* fs/block_dev.c */
2329 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2330 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2333 #define BLKDEV_MAJOR_HASH_SIZE 255
2334 extern const char *__bdevname(dev_t, char *buffer);
2335 extern const char *bdevname(struct block_device *bdev, char *buffer);
2336 extern struct block_device *lookup_bdev(const char *);
2337 extern void blkdev_show(struct seq_file *,off_t);
2340 #define BLKDEV_MAJOR_HASH_SIZE 0
2343 extern void init_special_inode(struct inode *, umode_t, dev_t);
2345 /* Invalid inode operations -- fs/bad_inode.c */
2346 extern void make_bad_inode(struct inode *);
2347 extern int is_bad_inode(struct inode *);
2349 extern const struct file_operations read_pipefifo_fops;
2350 extern const struct file_operations write_pipefifo_fops;
2351 extern const struct file_operations rdwr_pipefifo_fops;
2355 * return READ, READA, or WRITE
2357 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2360 * return data direction, READ or WRITE
2362 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2364 extern void check_disk_size_change(struct gendisk *disk,
2365 struct block_device *bdev);
2366 extern int revalidate_disk(struct gendisk *);
2367 extern int check_disk_change(struct block_device *);
2368 extern int __invalidate_device(struct block_device *, bool);
2369 extern int invalidate_partition(struct gendisk *, int);
2371 unsigned long invalidate_mapping_pages(struct address_space *mapping,
2372 pgoff_t start, pgoff_t end);
2374 static inline void invalidate_remote_inode(struct inode *inode)
2376 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2377 S_ISLNK(inode->i_mode))
2378 invalidate_mapping_pages(inode->i_mapping, 0, -1);
2380 extern int invalidate_inode_pages2(struct address_space *mapping);
2381 extern int invalidate_inode_pages2_range(struct address_space *mapping,
2382 pgoff_t start, pgoff_t end);
2383 extern int write_inode_now(struct inode *, int);
2384 extern int filemap_fdatawrite(struct address_space *);
2385 extern int filemap_flush(struct address_space *);
2386 extern int filemap_fdatawait(struct address_space *);
2387 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
2389 extern int filemap_write_and_wait(struct address_space *mapping);
2390 extern int filemap_write_and_wait_range(struct address_space *mapping,
2391 loff_t lstart, loff_t lend);
2392 extern int __filemap_fdatawrite_range(struct address_space *mapping,
2393 loff_t start, loff_t end, int sync_mode);
2394 extern int filemap_fdatawrite_range(struct address_space *mapping,
2395 loff_t start, loff_t end);
2397 extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
2399 extern int vfs_fsync(struct file *file, int datasync);
2400 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
2401 extern void emergency_sync(void);
2402 extern void emergency_remount(void);
2404 extern sector_t bmap(struct inode *, sector_t);
2406 extern int notify_change(struct dentry *, struct iattr *);
2407 extern int inode_permission(struct inode *, int);
2408 extern int generic_permission(struct inode *, int);
2410 static inline bool execute_ok(struct inode *inode)
2412 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2416 * get_write_access() gets write permission for a file.
2417 * put_write_access() releases this write permission.
2418 * This is used for regular files.
2419 * We cannot support write (and maybe mmap read-write shared) accesses and
2420 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2421 * can have the following values:
2422 * 0: no writers, no VM_DENYWRITE mappings
2423 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2424 * > 0: (i_writecount) users are writing to the file.
2426 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2427 * except for the cases where we don't hold i_writecount yet. Then we need to
2428 * use {get,deny}_write_access() - these functions check the sign and refuse
2429 * to do the change if sign is wrong.
2431 static inline int get_write_access(struct inode *inode)
2433 return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
2435 static inline int deny_write_access(struct file *file)
2437 struct inode *inode = file->f_path.dentry->d_inode;
2438 return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
2440 static inline void put_write_access(struct inode * inode)
2442 atomic_dec(&inode->i_writecount);
2444 static inline void allow_write_access(struct file *file)
2447 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
2450 static inline void i_readcount_dec(struct inode *inode)
2452 BUG_ON(!atomic_read(&inode->i_readcount));
2453 atomic_dec(&inode->i_readcount);
2455 static inline void i_readcount_inc(struct inode *inode)
2457 atomic_inc(&inode->i_readcount);
2460 static inline void i_readcount_dec(struct inode *inode)
2464 static inline void i_readcount_inc(struct inode *inode)
2469 extern int do_pipe_flags(int *, int);
2471 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
2472 extern struct file * open_exec(const char *);
2474 /* fs/dcache.c -- generic fs support functions */
2475 extern int is_subdir(struct dentry *, struct dentry *);
2476 extern int path_is_under(struct path *, struct path *);
2477 extern ino_t find_inode_number(struct dentry *, struct qstr *);
2479 #include <linux/err.h>
2481 /* needed for stackable file system support */
2482 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
2484 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
2486 extern int inode_init_always(struct super_block *, struct inode *);
2487 extern void inode_init_once(struct inode *);
2488 extern void address_space_init_once(struct address_space *mapping);
2489 extern void ihold(struct inode * inode);
2490 extern void iput(struct inode *);
2491 extern struct inode * igrab(struct inode *);
2492 extern ino_t iunique(struct super_block *, ino_t);
2493 extern int inode_needs_sync(struct inode *inode);
2494 extern int generic_delete_inode(struct inode *inode);
2495 static inline int generic_drop_inode(struct inode *inode)
2497 return !inode->i_nlink || inode_unhashed(inode);
2500 extern struct inode *ilookup5_nowait(struct super_block *sb,
2501 unsigned long hashval, int (*test)(struct inode *, void *),
2503 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2504 int (*test)(struct inode *, void *), void *data);
2505 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2507 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2508 extern struct inode * iget_locked(struct super_block *, unsigned long);
2509 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2510 extern int insert_inode_locked(struct inode *);
2511 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2512 extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
2514 static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
2516 extern void unlock_new_inode(struct inode *);
2517 extern unsigned int get_next_ino(void);
2519 extern void __iget(struct inode * inode);
2520 extern void iget_failed(struct inode *);
2521 extern void clear_inode(struct inode *);
2522 extern void __destroy_inode(struct inode *);
2523 extern struct inode *new_inode_pseudo(struct super_block *sb);
2524 extern struct inode *new_inode(struct super_block *sb);
2525 extern void free_inode_nonrcu(struct inode *inode);
2526 extern int should_remove_suid(struct dentry *);
2527 extern int file_remove_suid(struct file *);
2529 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2530 static inline void insert_inode_hash(struct inode *inode)
2532 __insert_inode_hash(inode, inode->i_ino);
2535 extern void __remove_inode_hash(struct inode *);
2536 static inline void remove_inode_hash(struct inode *inode)
2538 if (!inode_unhashed(inode))
2539 __remove_inode_hash(inode);
2542 extern void inode_sb_list_add(struct inode *inode);
2545 extern void submit_bio(int, struct bio *);
2546 extern int bdev_read_only(struct block_device *);
2548 extern int set_blocksize(struct block_device *, int);
2549 extern int sb_set_blocksize(struct super_block *, int);
2550 extern int sb_min_blocksize(struct super_block *, int);
2552 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2553 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2554 extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr,
2555 unsigned long size, pgoff_t pgoff);
2556 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
2557 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2558 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2559 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
2561 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2562 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
2563 unsigned long *, loff_t, loff_t *, size_t, size_t);
2564 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
2565 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2566 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2567 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2568 extern int generic_segment_checks(const struct iovec *iov,
2569 unsigned long *nr_segs, size_t *count, int access_flags);
2571 /* fs/block_dev.c */
2572 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
2573 unsigned long nr_segs, loff_t pos);
2574 extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
2576 extern void block_sync_page(struct page *page);
2579 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
2580 struct pipe_inode_info *, size_t, unsigned int);
2581 extern ssize_t default_file_splice_read(struct file *, loff_t *,
2582 struct pipe_inode_info *, size_t, unsigned int);
2583 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2584 struct file *, loff_t *, size_t, unsigned int);
2585 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2586 struct file *out, loff_t *, size_t len, unsigned int flags);
2587 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
2588 size_t len, unsigned int flags);
2591 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2592 extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
2593 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
2594 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
2595 extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
2596 int origin, loff_t maxsize, loff_t eof);
2597 extern int generic_file_open(struct inode * inode, struct file * filp);
2598 extern int nonseekable_open(struct inode * inode, struct file * filp);
2600 #ifdef CONFIG_FS_XIP
2601 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
2603 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2604 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2605 size_t len, loff_t *ppos);
2606 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2608 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2615 typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
2616 loff_t file_offset);
2619 /* need locking between buffered and direct access */
2622 /* filesystem does not support filling holes */
2623 DIO_SKIP_HOLES = 0x02,
2626 void dio_end_io(struct bio *bio, int error);
2628 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2629 struct block_device *bdev, const struct iovec *iov, loff_t offset,
2630 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
2631 dio_submit_t submit_io, int flags);
2633 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2634 struct inode *inode, const struct iovec *iov, loff_t offset,
2635 unsigned long nr_segs, get_block_t get_block)
2637 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2638 offset, nr_segs, get_block, NULL, NULL,
2639 DIO_LOCKING | DIO_SKIP_HOLES);
2643 void inode_dio_wait(struct inode *inode);
2644 void inode_dio_done(struct inode *inode);
2646 extern const struct file_operations generic_ro_fops;
2648 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2650 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2651 extern int vfs_follow_link(struct nameidata *, const char *);
2652 extern int page_readlink(struct dentry *, char __user *, int);
2653 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2654 extern void page_put_link(struct dentry *, struct nameidata *, void *);
2655 extern int __page_symlink(struct inode *inode, const char *symname, int len,
2657 extern int page_symlink(struct inode *inode, const char *symname, int len);
2658 extern const struct inode_operations page_symlink_inode_operations;
2659 extern int generic_readlink(struct dentry *, char __user *, int);
2660 extern void generic_fillattr(struct inode *, struct kstat *);
2661 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2662 void __inode_add_bytes(struct inode *inode, loff_t bytes);
2663 void inode_add_bytes(struct inode *inode, loff_t bytes);
2664 void inode_sub_bytes(struct inode *inode, loff_t bytes);
2665 loff_t inode_get_bytes(struct inode *inode);
2666 void inode_set_bytes(struct inode *inode, loff_t bytes);
2668 extern int vfs_readdir(struct file *, filldir_t, void *);
2670 extern int vfs_stat(const char __user *, struct kstat *);
2671 extern int vfs_lstat(const char __user *, struct kstat *);
2672 extern int vfs_fstat(unsigned int, struct kstat *);
2673 extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
2675 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2677 extern int __generic_block_fiemap(struct inode *inode,
2678 struct fiemap_extent_info *fieinfo,
2679 loff_t start, loff_t len,
2680 get_block_t *get_block);
2681 extern int generic_block_fiemap(struct inode *inode,
2682 struct fiemap_extent_info *fieinfo, u64 start,
2683 u64 len, get_block_t *get_block);
2685 extern void get_filesystem(struct file_system_type *fs);
2686 extern void put_filesystem(struct file_system_type *fs);
2687 extern struct file_system_type *get_fs_type(const char *name);
2688 extern struct super_block *get_super(struct block_device *);
2689 extern struct super_block *get_super_thawed(struct block_device *);
2690 extern struct super_block *get_active_super(struct block_device *bdev);
2691 extern void drop_super(struct super_block *sb);
2692 extern void iterate_supers(void (*)(struct super_block *, void *), void *);
2693 extern void iterate_supers_type(struct file_system_type *,
2694 void (*)(struct super_block *, void *), void *);
2696 extern int dcache_dir_open(struct inode *, struct file *);
2697 extern int dcache_dir_close(struct inode *, struct file *);
2698 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2699 extern int dcache_readdir(struct file *, void *, filldir_t);
2700 extern int simple_setattr(struct dentry *, struct iattr *);
2701 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2702 extern int simple_statfs(struct dentry *, struct kstatfs *);
2703 extern int simple_open(struct inode *inode, struct file *file);
2704 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2705 extern int simple_unlink(struct inode *, struct dentry *);
2706 extern int simple_rmdir(struct inode *, struct dentry *);
2707 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2708 extern int noop_fsync(struct file *, loff_t, loff_t, int);
2709 extern int simple_empty(struct dentry *);
2710 extern int simple_readpage(struct file *file, struct page *page);
2711 extern int simple_write_begin(struct file *file, struct address_space *mapping,
2712 loff_t pos, unsigned len, unsigned flags,
2713 struct page **pagep, void **fsdata);
2714 extern int simple_write_end(struct file *file, struct address_space *mapping,
2715 loff_t pos, unsigned len, unsigned copied,
2716 struct page *page, void *fsdata);
2718 extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
2719 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2720 extern const struct file_operations simple_dir_operations;
2721 extern const struct inode_operations simple_dir_inode_operations;
2722 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2723 struct dentry *d_alloc_name(struct dentry *, const char *);
2724 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2725 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
2726 extern void simple_release_fs(struct vfsmount **mount, int *count);
2728 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2729 loff_t *ppos, const void *from, size_t available);
2730 extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
2731 const void __user *from, size_t count);
2733 extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
2735 extern int generic_check_addressable(unsigned, u64);
2737 #ifdef CONFIG_MIGRATION
2738 extern int buffer_migrate_page(struct address_space *,
2739 struct page *, struct page *,
2742 #define buffer_migrate_page NULL
2745 extern int inode_change_ok(const struct inode *, struct iattr *);
2746 extern int inode_newsize_ok(const struct inode *, loff_t offset);
2747 extern void setattr_copy(struct inode *inode, const struct iattr *attr);
2749 extern int file_update_time(struct file *file);
2751 extern int generic_show_options(struct seq_file *m, struct dentry *root);
2752 extern void save_mount_options(struct super_block *sb, char *options);
2753 extern void replace_mount_options(struct super_block *sb, char *options);
2755 static inline ino_t parent_ino(struct dentry *dentry)
2760 * Don't strictly need d_lock here? If the parent ino could change
2761 * then surely we'd have a deeper race in the caller?
2763 spin_lock(&dentry->d_lock);
2764 res = dentry->d_parent->d_inode->i_ino;
2765 spin_unlock(&dentry->d_lock);
2769 /* Transaction based IO helpers */
2772 * An argresp is stored in an allocated page and holds the
2773 * size of the argument or response, along with its content
2775 struct simple_transaction_argresp {
2780 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2782 char *simple_transaction_get(struct file *file, const char __user *buf,
2784 ssize_t simple_transaction_read(struct file *file, char __user *buf,
2785 size_t size, loff_t *pos);
2786 int simple_transaction_release(struct inode *inode, struct file *file);
2788 void simple_transaction_set(struct file *file, size_t n);
2791 * simple attribute files
2793 * These attributes behave similar to those in sysfs:
2795 * Writing to an attribute immediately sets a value, an open file can be
2796 * written to multiple times.
2798 * Reading from an attribute creates a buffer from the value that might get
2799 * read with multiple read calls. When the attribute has been read
2800 * completely, no further read calls are possible until the file is opened
2803 * All attributes contain a text representation of a numeric value
2804 * that are accessed with the get() and set() functions.
2806 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2807 static int __fops ## _open(struct inode *inode, struct file *file) \
2809 __simple_attr_check_format(__fmt, 0ull); \
2810 return simple_attr_open(inode, file, __get, __set, __fmt); \
2812 static const struct file_operations __fops = { \
2813 .owner = THIS_MODULE, \
2814 .open = __fops ## _open, \
2815 .release = simple_attr_release, \
2816 .read = simple_attr_read, \
2817 .write = simple_attr_write, \
2818 .llseek = generic_file_llseek, \
2821 static inline __printf(1, 2)
2822 void __simple_attr_check_format(const char *fmt, ...)
2824 /* don't do anything, just let the compiler check the arguments; */
2827 int simple_attr_open(struct inode *inode, struct file *file,
2828 int (*get)(void *, u64 *), int (*set)(void *, u64),
2830 int simple_attr_release(struct inode *inode, struct file *file);
2831 ssize_t simple_attr_read(struct file *file, char __user *buf,
2832 size_t len, loff_t *ppos);
2833 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2834 size_t len, loff_t *ppos);
2837 int proc_nr_files(struct ctl_table *table, int write,
2838 void __user *buffer, size_t *lenp, loff_t *ppos);
2839 int proc_nr_dentry(struct ctl_table *table, int write,
2840 void __user *buffer, size_t *lenp, loff_t *ppos);
2841 int proc_nr_inodes(struct ctl_table *table, int write,
2842 void __user *buffer, size_t *lenp, loff_t *ppos);
2843 int __init get_filesystem_list(char *buf);
2845 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2846 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2848 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2849 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2850 (flag & __FMODE_NONOTIFY)))
2852 static inline int is_sxid(umode_t mode)
2854 return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
2857 static inline void inode_has_no_xattr(struct inode *inode)
2859 if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
2860 inode->i_flags |= S_NOSEC;
2863 #endif /* __KERNEL__ */
2864 #endif /* _LINUX_FS_H */