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[linux-2.6.32.60-moxart.git] / include / linux / fs.h
blob860cb6dfce474e5cdabd081282ce0955cf50257e
1 #ifndef _LINUX_FS_H
2 #define _LINUX_FS_H
4 /*
5 * This file has definitions for some important file table
6 * structures etc.
7 */
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
13 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
14 * the file limit at runtime and only root can increase the per-process
15 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
16 * upper limit on files-per-process.
18 * Some programs (notably those using select()) may have to be
19 * recompiled to take full advantage of the new limits..
22 /* Fixed constants first: */
23 #undef NR_OPEN
24 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
26 #define BLOCK_SIZE_BITS 10
27 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
29 #define SEEK_SET 0 /* seek relative to beginning of file */
30 #define SEEK_CUR 1 /* seek relative to current file position */
31 #define SEEK_END 2 /* seek relative to end of file */
32 #define SEEK_MAX SEEK_END
34 /* And dynamically-tunable limits and defaults: */
35 struct files_stat_struct {
36 int nr_files; /* read only */
37 int nr_free_files; /* read only */
38 int max_files; /* tunable */
41 struct inodes_stat_t {
42 int nr_inodes;
43 int nr_unused;
44 int dummy[5]; /* padding for sysctl ABI compatibility */
48 #define NR_FILE 8192 /* this can well be larger on a larger system */
50 #define MAY_EXEC 1
51 #define MAY_WRITE 2
52 #define MAY_READ 4
53 #define MAY_APPEND 8
54 #define MAY_ACCESS 16
55 #define MAY_OPEN 32
58 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
59 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
62 /* file is open for reading */
63 #define FMODE_READ ((__force fmode_t)1)
64 /* file is open for writing */
65 #define FMODE_WRITE ((__force fmode_t)2)
66 /* file is seekable */
67 #define FMODE_LSEEK ((__force fmode_t)4)
68 /* file can be accessed using pread */
69 #define FMODE_PREAD ((__force fmode_t)8)
70 /* file can be accessed using pwrite */
71 #define FMODE_PWRITE ((__force fmode_t)16)
72 /* File is opened for execution with sys_execve / sys_uselib */
73 #define FMODE_EXEC ((__force fmode_t)32)
74 /* File is opened with O_NDELAY (only set for block devices) */
75 #define FMODE_NDELAY ((__force fmode_t)64)
76 /* File is opened with O_EXCL (only set for block devices) */
77 #define FMODE_EXCL ((__force fmode_t)128)
78 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
79 (specialy hack for floppy.c) */
80 #define FMODE_WRITE_IOCTL ((__force fmode_t)256)
83 * Don't update ctime and mtime.
85 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
86 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
88 #define FMODE_NOCMTIME ((__force fmode_t)2048)
90 /* Expect random access pattern */
91 #define FMODE_RANDOM ((__force fmode_t)4096)
94 * The below are the various read and write types that we support. Some of
95 * them include behavioral modifiers that send information down to the
96 * block layer and IO scheduler. Terminology:
98 * The block layer uses device plugging to defer IO a little bit, in
99 * the hope that we will see more IO very shortly. This increases
100 * coalescing of adjacent IO and thus reduces the number of IOs we
101 * have to send to the device. It also allows for better queuing,
102 * if the IO isn't mergeable. If the caller is going to be waiting
103 * for the IO, then he must ensure that the device is unplugged so
104 * that the IO is dispatched to the driver.
106 * All IO is handled async in Linux. This is fine for background
107 * writes, but for reads or writes that someone waits for completion
108 * on, we want to notify the block layer and IO scheduler so that they
109 * know about it. That allows them to make better scheduling
110 * decisions. So when the below references 'sync' and 'async', it
111 * is referencing this priority hint.
113 * With that in mind, the available types are:
115 * READ A normal read operation. Device will be plugged.
116 * READ_SYNC A synchronous read. Device is not plugged, caller can
117 * immediately wait on this read without caring about
118 * unplugging.
119 * READA Used for read-ahead operations. Lower priority, and the
120 * block layer could (in theory) choose to ignore this
121 * request if it runs into resource problems.
122 * WRITE A normal async write. Device will be plugged.
123 * SWRITE Like WRITE, but a special case for ll_rw_block() that
124 * tells it to lock the buffer first. Normally a buffer
125 * must be locked before doing IO.
126 * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
127 * the hint that someone will be waiting on this IO
128 * shortly. The device must still be unplugged explicitly,
129 * WRITE_SYNC_PLUG does not do this as we could be
130 * submitting more writes before we actually wait on any
131 * of them.
132 * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device
133 * immediately after submission. The write equivalent
134 * of READ_SYNC.
135 * WRITE_ODIRECT Special case write for O_DIRECT only.
136 * SWRITE_SYNC
137 * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
138 * See SWRITE.
139 * WRITE_BARRIER Like WRITE, but tells the block layer that all
140 * previously submitted writes must be safely on storage
141 * before this one is started. Also guarantees that when
142 * this write is complete, it itself is also safely on
143 * storage. Prevents reordering of writes on both sides
144 * of this IO.
147 #define RW_MASK 1
148 #define RWA_MASK 16
149 #define READ 0
150 #define WRITE 1
151 #define READA 16 /* readahead - don't block if no resources */
152 #define SWRITE 17 /* for ll_rw_block(), wait for buffer lock */
153 #define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
154 #define READ_META (READ | (1 << BIO_RW_META))
155 #define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
156 #define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
157 #define WRITE_ODIRECT (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
158 #define SWRITE_SYNC_PLUG \
159 (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
160 #define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
161 #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
164 * These aren't really reads or writes, they pass down information about
165 * parts of device that are now unused by the file system.
167 #define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
168 #define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))
170 #define SEL_IN 1
171 #define SEL_OUT 2
172 #define SEL_EX 4
174 /* public flags for file_system_type */
175 #define FS_REQUIRES_DEV 1
176 #define FS_BINARY_MOUNTDATA 2
177 #define FS_HAS_SUBTYPE 4
178 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
179 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
180 * during rename() internally.
184 * These are the fs-independent mount-flags: up to 32 flags are supported
186 #define MS_RDONLY 1 /* Mount read-only */
187 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
188 #define MS_NODEV 4 /* Disallow access to device special files */
189 #define MS_NOEXEC 8 /* Disallow program execution */
190 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
191 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
192 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
193 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
194 #define MS_NOATIME 1024 /* Do not update access times. */
195 #define MS_NODIRATIME 2048 /* Do not update directory access times */
196 #define MS_BIND 4096
197 #define MS_MOVE 8192
198 #define MS_REC 16384
199 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
200 MS_VERBOSE is deprecated. */
201 #define MS_SILENT 32768
202 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
203 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
204 #define MS_PRIVATE (1<<18) /* change to private */
205 #define MS_SLAVE (1<<19) /* change to slave */
206 #define MS_SHARED (1<<20) /* change to shared */
207 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
208 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
209 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
210 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
211 #define MS_ACTIVE (1<<30)
212 #define MS_NOUSER (1<<31)
215 * Superblock flags that can be altered by MS_REMOUNT
217 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
220 * Old magic mount flag and mask
222 #define MS_MGC_VAL 0xC0ED0000
223 #define MS_MGC_MSK 0xffff0000
225 /* Inode flags - they have nothing to superblock flags now */
227 #define S_SYNC 1 /* Writes are synced at once */
228 #define S_NOATIME 2 /* Do not update access times */
229 #define S_APPEND 4 /* Append-only file */
230 #define S_IMMUTABLE 8 /* Immutable file */
231 #define S_DEAD 16 /* removed, but still open directory */
232 #define S_NOQUOTA 32 /* Inode is not counted to quota */
233 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
234 #define S_NOCMTIME 128 /* Do not update file c/mtime */
235 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
236 #define S_PRIVATE 512 /* Inode is fs-internal */
239 * Note that nosuid etc flags are inode-specific: setting some file-system
240 * flags just means all the inodes inherit those flags by default. It might be
241 * possible to override it selectively if you really wanted to with some
242 * ioctl() that is not currently implemented.
244 * Exception: MS_RDONLY is always applied to the entire file system.
246 * Unfortunately, it is possible to change a filesystems flags with it mounted
247 * with files in use. This means that all of the inodes will not have their
248 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
249 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
251 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
253 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
254 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
255 ((inode)->i_flags & S_SYNC))
256 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
257 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
258 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
259 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
260 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
262 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
263 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
264 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
265 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
267 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
268 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
269 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
270 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
272 /* the read-only stuff doesn't really belong here, but any other place is
273 probably as bad and I don't want to create yet another include file. */
275 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
276 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
277 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
278 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
279 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
280 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
281 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
282 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
283 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
284 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
285 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
286 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
287 #if 0
288 #define BLKPG _IO(0x12,105)/* See blkpg.h */
290 /* Some people are morons. Do not use sizeof! */
292 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
293 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
294 /* This was here just to show that the number is taken -
295 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
296 #endif
297 /* A jump here: 108-111 have been used for various private purposes. */
298 #define BLKBSZGET _IOR(0x12,112,size_t)
299 #define BLKBSZSET _IOW(0x12,113,size_t)
300 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
301 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
302 #define BLKTRACESTART _IO(0x12,116)
303 #define BLKTRACESTOP _IO(0x12,117)
304 #define BLKTRACETEARDOWN _IO(0x12,118)
305 #define BLKDISCARD _IO(0x12,119)
306 #define BLKIOMIN _IO(0x12,120)
307 #define BLKIOOPT _IO(0x12,121)
308 #define BLKALIGNOFF _IO(0x12,122)
309 #define BLKPBSZGET _IO(0x12,123)
311 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
312 #define FIBMAP _IO(0x00,1) /* bmap access */
313 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
314 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
315 #define FITHAW _IOWR('X', 120, int) /* Thaw */
317 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
318 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
319 #define FS_IOC_GETVERSION _IOR('v', 1, long)
320 #define FS_IOC_SETVERSION _IOW('v', 2, long)
321 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
322 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
323 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
324 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
325 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
328 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
330 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
331 #define FS_UNRM_FL 0x00000002 /* Undelete */
332 #define FS_COMPR_FL 0x00000004 /* Compress file */
333 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
334 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
335 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
336 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
337 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
338 /* Reserved for compression usage... */
339 #define FS_DIRTY_FL 0x00000100
340 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
341 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
342 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
343 /* End compression flags --- maybe not all used */
344 #define FS_BTREE_FL 0x00001000 /* btree format dir */
345 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
346 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
347 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
348 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
349 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
350 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
351 #define FS_EXTENT_FL 0x00080000 /* Extents */
352 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
353 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
355 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
356 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
359 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
360 #define SYNC_FILE_RANGE_WRITE 2
361 #define SYNC_FILE_RANGE_WAIT_AFTER 4
363 #ifdef __KERNEL__
365 #include <linux/linkage.h>
366 #include <linux/wait.h>
367 #include <linux/types.h>
368 #include <linux/kdev_t.h>
369 #include <linux/dcache.h>
370 #include <linux/path.h>
371 #include <linux/stat.h>
372 #include <linux/cache.h>
373 #include <linux/kobject.h>
374 #include <linux/list.h>
375 #include <linux/radix-tree.h>
376 #include <linux/prio_tree.h>
377 #include <linux/init.h>
378 #include <linux/pid.h>
379 #include <linux/mutex.h>
380 #include <linux/capability.h>
381 #include <linux/semaphore.h>
382 #include <linux/fiemap.h>
384 #include <asm/atomic.h>
385 #include <asm/byteorder.h>
387 struct export_operations;
388 struct hd_geometry;
389 struct iovec;
390 struct nameidata;
391 struct kiocb;
392 struct pipe_inode_info;
393 struct poll_table_struct;
394 struct kstatfs;
395 struct vm_area_struct;
396 struct vfsmount;
397 struct cred;
399 extern void __init inode_init(void);
400 extern void __init inode_init_early(void);
401 extern void __init files_init(unsigned long);
403 extern struct files_stat_struct files_stat;
404 extern int get_max_files(void);
405 extern int sysctl_nr_open;
406 extern struct inodes_stat_t inodes_stat;
407 extern int leases_enable, lease_break_time;
408 #ifdef CONFIG_DNOTIFY
409 extern int dir_notify_enable;
410 #endif
412 struct buffer_head;
413 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
414 struct buffer_head *bh_result, int create);
415 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
416 ssize_t bytes, void *private);
419 * Attribute flags. These should be or-ed together to figure out what
420 * has been changed!
422 #define ATTR_MODE (1 << 0)
423 #define ATTR_UID (1 << 1)
424 #define ATTR_GID (1 << 2)
425 #define ATTR_SIZE (1 << 3)
426 #define ATTR_ATIME (1 << 4)
427 #define ATTR_MTIME (1 << 5)
428 #define ATTR_CTIME (1 << 6)
429 #define ATTR_ATIME_SET (1 << 7)
430 #define ATTR_MTIME_SET (1 << 8)
431 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
432 #define ATTR_ATTR_FLAG (1 << 10)
433 #define ATTR_KILL_SUID (1 << 11)
434 #define ATTR_KILL_SGID (1 << 12)
435 #define ATTR_FILE (1 << 13)
436 #define ATTR_KILL_PRIV (1 << 14)
437 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
438 #define ATTR_TIMES_SET (1 << 16)
441 * This is the Inode Attributes structure, used for notify_change(). It
442 * uses the above definitions as flags, to know which values have changed.
443 * Also, in this manner, a Filesystem can look at only the values it cares
444 * about. Basically, these are the attributes that the VFS layer can
445 * request to change from the FS layer.
447 * Derek Atkins <warlord@MIT.EDU> 94-10-20
449 struct iattr {
450 unsigned int ia_valid;
451 umode_t ia_mode;
452 uid_t ia_uid;
453 gid_t ia_gid;
454 loff_t ia_size;
455 struct timespec ia_atime;
456 struct timespec ia_mtime;
457 struct timespec ia_ctime;
460 * Not an attribute, but an auxilary info for filesystems wanting to
461 * implement an ftruncate() like method. NOTE: filesystem should
462 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
464 struct file *ia_file;
468 * Includes for diskquotas.
470 #include <linux/quota.h>
472 /**
473 * enum positive_aop_returns - aop return codes with specific semantics
475 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
476 * completed, that the page is still locked, and
477 * should be considered active. The VM uses this hint
478 * to return the page to the active list -- it won't
479 * be a candidate for writeback again in the near
480 * future. Other callers must be careful to unlock
481 * the page if they get this return. Returned by
482 * writepage();
484 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
485 * unlocked it and the page might have been truncated.
486 * The caller should back up to acquiring a new page and
487 * trying again. The aop will be taking reasonable
488 * precautions not to livelock. If the caller held a page
489 * reference, it should drop it before retrying. Returned
490 * by readpage().
492 * address_space_operation functions return these large constants to indicate
493 * special semantics to the caller. These are much larger than the bytes in a
494 * page to allow for functions that return the number of bytes operated on in a
495 * given page.
498 enum positive_aop_returns {
499 AOP_WRITEPAGE_ACTIVATE = 0x80000,
500 AOP_TRUNCATED_PAGE = 0x80001,
503 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
504 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
505 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
506 * helper code (eg buffer layer)
507 * to clear GFP_FS from alloc */
510 * oh the beauties of C type declarations.
512 struct page;
513 struct address_space;
514 struct writeback_control;
516 struct iov_iter {
517 const struct iovec *iov;
518 unsigned long nr_segs;
519 size_t iov_offset;
520 size_t count;
523 size_t iov_iter_copy_from_user_atomic(struct page *page,
524 struct iov_iter *i, unsigned long offset, size_t bytes);
525 size_t iov_iter_copy_from_user(struct page *page,
526 struct iov_iter *i, unsigned long offset, size_t bytes);
527 void iov_iter_advance(struct iov_iter *i, size_t bytes);
528 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
529 size_t iov_iter_single_seg_count(struct iov_iter *i);
531 static inline void iov_iter_init(struct iov_iter *i,
532 const struct iovec *iov, unsigned long nr_segs,
533 size_t count, size_t written)
535 i->iov = iov;
536 i->nr_segs = nr_segs;
537 i->iov_offset = 0;
538 i->count = count + written;
540 iov_iter_advance(i, written);
543 static inline size_t iov_iter_count(struct iov_iter *i)
545 return i->count;
549 * "descriptor" for what we're up to with a read.
550 * This allows us to use the same read code yet
551 * have multiple different users of the data that
552 * we read from a file.
554 * The simplest case just copies the data to user
555 * mode.
557 typedef struct {
558 size_t written;
559 size_t count;
560 union {
561 char __user *buf;
562 void *data;
563 } arg;
564 int error;
565 } read_descriptor_t;
567 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
568 unsigned long, unsigned long);
570 struct address_space_operations {
571 int (*writepage)(struct page *page, struct writeback_control *wbc);
572 int (*readpage)(struct file *, struct page *);
573 void (*sync_page)(struct page *);
575 /* Write back some dirty pages from this mapping. */
576 int (*writepages)(struct address_space *, struct writeback_control *);
578 /* Set a page dirty. Return true if this dirtied it */
579 int (*set_page_dirty)(struct page *page);
581 int (*readpages)(struct file *filp, struct address_space *mapping,
582 struct list_head *pages, unsigned nr_pages);
584 int (*write_begin)(struct file *, struct address_space *mapping,
585 loff_t pos, unsigned len, unsigned flags,
586 struct page **pagep, void **fsdata);
587 int (*write_end)(struct file *, struct address_space *mapping,
588 loff_t pos, unsigned len, unsigned copied,
589 struct page *page, void *fsdata);
591 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
592 sector_t (*bmap)(struct address_space *, sector_t);
593 void (*invalidatepage) (struct page *, unsigned long);
594 int (*releasepage) (struct page *, gfp_t);
595 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
596 loff_t offset, unsigned long nr_segs);
597 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
598 void **, unsigned long *);
599 /* migrate the contents of a page to the specified target */
600 int (*migratepage) (struct address_space *,
601 struct page *, struct page *);
602 int (*launder_page) (struct page *);
603 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
604 unsigned long);
605 int (*error_remove_page)(struct address_space *, struct page *);
609 * pagecache_write_begin/pagecache_write_end must be used by general code
610 * to write into the pagecache.
612 int pagecache_write_begin(struct file *, struct address_space *mapping,
613 loff_t pos, unsigned len, unsigned flags,
614 struct page **pagep, void **fsdata);
616 int pagecache_write_end(struct file *, struct address_space *mapping,
617 loff_t pos, unsigned len, unsigned copied,
618 struct page *page, void *fsdata);
620 struct backing_dev_info;
621 struct address_space {
622 struct inode *host; /* owner: inode, block_device */
623 struct radix_tree_root page_tree; /* radix tree of all pages */
624 spinlock_t tree_lock; /* and lock protecting it */
625 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
626 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
627 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
628 spinlock_t i_mmap_lock; /* protect tree, count, list */
629 unsigned int truncate_count; /* Cover race condition with truncate */
630 unsigned long nrpages; /* number of total pages */
631 pgoff_t writeback_index;/* writeback starts here */
632 const struct address_space_operations *a_ops; /* methods */
633 unsigned long flags; /* error bits/gfp mask */
634 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
635 spinlock_t private_lock; /* for use by the address_space */
636 struct list_head private_list; /* ditto */
637 struct address_space *assoc_mapping; /* ditto */
638 struct mutex unmap_mutex; /* to protect unmapping */
639 } __attribute__((aligned(sizeof(long))));
641 * On most architectures that alignment is already the case; but
642 * must be enforced here for CRIS, to let the least signficant bit
643 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
646 struct block_device {
647 dev_t bd_dev; /* not a kdev_t - it's a search key */
648 struct inode * bd_inode; /* will die */
649 struct super_block * bd_super;
650 int bd_openers;
651 struct mutex bd_mutex; /* open/close mutex */
652 struct list_head bd_inodes;
653 void * bd_holder;
654 int bd_holders;
655 #ifdef CONFIG_SYSFS
656 struct list_head bd_holder_list;
657 #endif
658 struct block_device * bd_contains;
659 unsigned bd_block_size;
660 struct hd_struct * bd_part;
661 /* number of times partitions within this device have been opened. */
662 unsigned bd_part_count;
663 int bd_invalidated;
664 struct gendisk * bd_disk;
665 struct list_head bd_list;
667 * Private data. You must have bd_claim'ed the block_device
668 * to use this. NOTE: bd_claim allows an owner to claim
669 * the same device multiple times, the owner must take special
670 * care to not mess up bd_private for that case.
672 unsigned long bd_private;
674 /* The counter of freeze processes */
675 int bd_fsfreeze_count;
676 /* Mutex for freeze */
677 struct mutex bd_fsfreeze_mutex;
681 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
682 * radix trees
684 #define PAGECACHE_TAG_DIRTY 0
685 #define PAGECACHE_TAG_WRITEBACK 1
687 int mapping_tagged(struct address_space *mapping, int tag);
690 * Might pages of this file be mapped into userspace?
692 static inline int mapping_mapped(struct address_space *mapping)
694 return !prio_tree_empty(&mapping->i_mmap) ||
695 !list_empty(&mapping->i_mmap_nonlinear);
699 * Might pages of this file have been modified in userspace?
700 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
701 * marks vma as VM_SHARED if it is shared, and the file was opened for
702 * writing i.e. vma may be mprotected writable even if now readonly.
704 static inline int mapping_writably_mapped(struct address_space *mapping)
706 return mapping->i_mmap_writable != 0;
710 * Use sequence counter to get consistent i_size on 32-bit processors.
712 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
713 #include <linux/seqlock.h>
714 #define __NEED_I_SIZE_ORDERED
715 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
716 #else
717 #define i_size_ordered_init(inode) do { } while (0)
718 #endif
720 struct posix_acl;
721 #define ACL_NOT_CACHED ((void *)(-1))
723 struct inode {
724 struct hlist_node i_hash;
725 struct list_head i_list; /* backing dev IO list */
726 struct list_head i_sb_list;
727 struct list_head i_dentry;
728 unsigned long i_ino;
729 atomic_t i_count;
730 unsigned int i_nlink;
731 uid_t i_uid;
732 gid_t i_gid;
733 dev_t i_rdev;
734 u64 i_version;
735 loff_t i_size;
736 #ifdef __NEED_I_SIZE_ORDERED
737 seqcount_t i_size_seqcount;
738 #endif
739 struct timespec i_atime;
740 struct timespec i_mtime;
741 struct timespec i_ctime;
742 blkcnt_t i_blocks;
743 unsigned int i_blkbits;
744 unsigned short i_bytes;
745 umode_t i_mode;
746 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
747 struct mutex i_mutex;
748 struct rw_semaphore i_alloc_sem;
749 const struct inode_operations *i_op;
750 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
751 struct super_block *i_sb;
752 struct file_lock *i_flock;
753 struct address_space *i_mapping;
754 struct address_space i_data;
755 #ifdef CONFIG_QUOTA
756 struct dquot *i_dquot[MAXQUOTAS];
757 #endif
758 struct list_head i_devices;
759 union {
760 struct pipe_inode_info *i_pipe;
761 struct block_device *i_bdev;
762 struct cdev *i_cdev;
765 __u32 i_generation;
767 #ifdef CONFIG_FSNOTIFY
768 __u32 i_fsnotify_mask; /* all events this inode cares about */
769 struct hlist_head i_fsnotify_mark_entries; /* fsnotify mark entries */
770 #endif
772 #ifdef CONFIG_INOTIFY
773 struct list_head inotify_watches; /* watches on this inode */
774 struct mutex inotify_mutex; /* protects the watches list */
775 #endif
777 unsigned long i_state;
778 unsigned long dirtied_when; /* jiffies of first dirtying */
780 unsigned int i_flags;
782 atomic_t i_writecount;
783 #ifdef CONFIG_SECURITY
784 void *i_security;
785 #endif
786 #ifdef CONFIG_FS_POSIX_ACL
787 struct posix_acl *i_acl;
788 struct posix_acl *i_default_acl;
789 #endif
790 void *i_private; /* fs or device private pointer */
794 * inode->i_mutex nesting subclasses for the lock validator:
796 * 0: the object of the current VFS operation
797 * 1: parent
798 * 2: child/target
799 * 3: quota file
801 * The locking order between these classes is
802 * parent -> child -> normal -> xattr -> quota
804 enum inode_i_mutex_lock_class
806 I_MUTEX_NORMAL,
807 I_MUTEX_PARENT,
808 I_MUTEX_CHILD,
809 I_MUTEX_XATTR,
810 I_MUTEX_QUOTA
814 * NOTE: in a 32bit arch with a preemptable kernel and
815 * an UP compile the i_size_read/write must be atomic
816 * with respect to the local cpu (unlike with preempt disabled),
817 * but they don't need to be atomic with respect to other cpus like in
818 * true SMP (so they need either to either locally disable irq around
819 * the read or for example on x86 they can be still implemented as a
820 * cmpxchg8b without the need of the lock prefix). For SMP compiles
821 * and 64bit archs it makes no difference if preempt is enabled or not.
823 static inline loff_t i_size_read(const struct inode *inode)
825 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
826 loff_t i_size;
827 unsigned int seq;
829 do {
830 seq = read_seqcount_begin(&inode->i_size_seqcount);
831 i_size = inode->i_size;
832 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
833 return i_size;
834 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
835 loff_t i_size;
837 preempt_disable();
838 i_size = inode->i_size;
839 preempt_enable();
840 return i_size;
841 #else
842 return inode->i_size;
843 #endif
847 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
848 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
849 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
851 static inline void i_size_write(struct inode *inode, loff_t i_size)
853 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
854 write_seqcount_begin(&inode->i_size_seqcount);
855 inode->i_size = i_size;
856 write_seqcount_end(&inode->i_size_seqcount);
857 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
858 preempt_disable();
859 inode->i_size = i_size;
860 preempt_enable();
861 #else
862 inode->i_size = i_size;
863 #endif
866 static inline unsigned iminor(const struct inode *inode)
868 return MINOR(inode->i_rdev);
871 static inline unsigned imajor(const struct inode *inode)
873 return MAJOR(inode->i_rdev);
876 extern struct block_device *I_BDEV(struct inode *inode);
878 struct fown_struct {
879 rwlock_t lock; /* protects pid, uid, euid fields */
880 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
881 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
882 uid_t uid, euid; /* uid/euid of process setting the owner */
883 int signum; /* posix.1b rt signal to be delivered on IO */
887 * Track a single file's readahead state
889 struct file_ra_state {
890 pgoff_t start; /* where readahead started */
891 unsigned int size; /* # of readahead pages */
892 unsigned int async_size; /* do asynchronous readahead when
893 there are only # of pages ahead */
895 unsigned int ra_pages; /* Maximum readahead window */
896 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
897 loff_t prev_pos; /* Cache last read() position */
901 * Check if @index falls in the readahead windows.
903 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
905 return (index >= ra->start &&
906 index < ra->start + ra->size);
909 #define FILE_MNT_WRITE_TAKEN 1
910 #define FILE_MNT_WRITE_RELEASED 2
912 struct file {
914 * fu_list becomes invalid after file_free is called and queued via
915 * fu_rcuhead for RCU freeing
917 union {
918 struct list_head fu_list;
919 struct rcu_head fu_rcuhead;
920 } f_u;
921 struct path f_path;
922 #define f_dentry f_path.dentry
923 #define f_vfsmnt f_path.mnt
924 const struct file_operations *f_op;
925 spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */
926 atomic_long_t f_count;
927 unsigned int f_flags;
928 fmode_t f_mode;
929 loff_t f_pos;
930 struct fown_struct f_owner;
931 const struct cred *f_cred;
932 struct file_ra_state f_ra;
934 u64 f_version;
935 #ifdef CONFIG_SECURITY
936 void *f_security;
937 #endif
938 /* needed for tty driver, and maybe others */
939 void *private_data;
941 #ifdef CONFIG_EPOLL
942 /* Used by fs/eventpoll.c to link all the hooks to this file */
943 struct list_head f_ep_links;
944 struct list_head f_tfile_llink;
945 #endif /* #ifdef CONFIG_EPOLL */
946 struct address_space *f_mapping;
947 #ifdef CONFIG_DEBUG_WRITECOUNT
948 unsigned long f_mnt_write_state;
949 #endif
951 extern spinlock_t files_lock;
952 #define file_list_lock() spin_lock(&files_lock);
953 #define file_list_unlock() spin_unlock(&files_lock);
955 #define get_file(x) atomic_long_inc(&(x)->f_count)
956 #define file_count(x) atomic_long_read(&(x)->f_count)
958 #ifdef CONFIG_DEBUG_WRITECOUNT
959 static inline void file_take_write(struct file *f)
961 WARN_ON(f->f_mnt_write_state != 0);
962 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
964 static inline void file_release_write(struct file *f)
966 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
968 static inline void file_reset_write(struct file *f)
970 f->f_mnt_write_state = 0;
972 static inline void file_check_state(struct file *f)
975 * At this point, either both or neither of these bits
976 * should be set.
978 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
979 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
981 static inline int file_check_writeable(struct file *f)
983 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
984 return 0;
985 printk(KERN_WARNING "writeable file with no "
986 "mnt_want_write()\n");
987 WARN_ON(1);
988 return -EINVAL;
990 #else /* !CONFIG_DEBUG_WRITECOUNT */
991 static inline void file_take_write(struct file *filp) {}
992 static inline void file_release_write(struct file *filp) {}
993 static inline void file_reset_write(struct file *filp) {}
994 static inline void file_check_state(struct file *filp) {}
995 static inline int file_check_writeable(struct file *filp)
997 return 0;
999 #endif /* CONFIG_DEBUG_WRITECOUNT */
1001 #define MAX_NON_LFS ((1UL<<31) - 1)
1003 /* Page cache limit. The filesystems should put that into their s_maxbytes
1004 limits, otherwise bad things can happen in VM. */
1005 #if BITS_PER_LONG==32
1006 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1007 #elif BITS_PER_LONG==64
1008 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1009 #endif
1011 #define FL_POSIX 1
1012 #define FL_FLOCK 2
1013 #define FL_ACCESS 8 /* not trying to lock, just looking */
1014 #define FL_EXISTS 16 /* when unlocking, test for existence */
1015 #define FL_LEASE 32 /* lease held on this file */
1016 #define FL_CLOSE 64 /* unlock on close */
1017 #define FL_SLEEP 128 /* A blocking lock */
1020 * Special return value from posix_lock_file() and vfs_lock_file() for
1021 * asynchronous locking.
1023 #define FILE_LOCK_DEFERRED 1
1026 * The POSIX file lock owner is determined by
1027 * the "struct files_struct" in the thread group
1028 * (or NULL for no owner - BSD locks).
1030 * Lockd stuffs a "host" pointer into this.
1032 typedef struct files_struct *fl_owner_t;
1034 struct file_lock_operations {
1035 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1036 void (*fl_release_private)(struct file_lock *);
1039 struct lock_manager_operations {
1040 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
1041 void (*fl_notify)(struct file_lock *); /* unblock callback */
1042 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
1043 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1044 void (*fl_release_private)(struct file_lock *);
1045 void (*fl_break)(struct file_lock *);
1046 int (*fl_mylease)(struct file_lock *, struct file_lock *);
1047 int (*fl_change)(struct file_lock **, int);
1050 struct lock_manager {
1051 struct list_head list;
1054 void locks_start_grace(struct lock_manager *);
1055 void locks_end_grace(struct lock_manager *);
1056 int locks_in_grace(void);
1058 /* that will die - we need it for nfs_lock_info */
1059 #include <linux/nfs_fs_i.h>
1061 struct file_lock {
1062 struct file_lock *fl_next; /* singly linked list for this inode */
1063 struct list_head fl_link; /* doubly linked list of all locks */
1064 struct list_head fl_block; /* circular list of blocked processes */
1065 fl_owner_t fl_owner;
1066 unsigned char fl_flags;
1067 unsigned char fl_type;
1068 unsigned int fl_pid;
1069 struct pid *fl_nspid;
1070 wait_queue_head_t fl_wait;
1071 struct file *fl_file;
1072 loff_t fl_start;
1073 loff_t fl_end;
1075 struct fasync_struct * fl_fasync; /* for lease break notifications */
1076 unsigned long fl_break_time; /* for nonblocking lease breaks */
1078 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1079 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1080 union {
1081 struct nfs_lock_info nfs_fl;
1082 struct nfs4_lock_info nfs4_fl;
1083 struct {
1084 struct list_head link; /* link in AFS vnode's pending_locks list */
1085 int state; /* state of grant or error if -ve */
1086 } afs;
1087 } fl_u;
1090 /* The following constant reflects the upper bound of the file/locking space */
1091 #ifndef OFFSET_MAX
1092 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1093 #define OFFSET_MAX INT_LIMIT(loff_t)
1094 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1095 #endif
1097 #include <linux/fcntl.h>
1099 extern void send_sigio(struct fown_struct *fown, int fd, int band);
1101 /* fs/sync.c */
1102 extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
1103 loff_t endbyte, unsigned int flags);
1105 #ifdef CONFIG_FILE_LOCKING
1106 extern int fcntl_getlk(struct file *, struct flock __user *);
1107 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1108 struct flock __user *);
1110 #if BITS_PER_LONG == 32
1111 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1112 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1113 struct flock64 __user *);
1114 #endif
1116 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1117 extern int fcntl_getlease(struct file *filp);
1119 /* fs/locks.c */
1120 extern void locks_init_lock(struct file_lock *);
1121 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1122 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1123 extern void locks_remove_posix(struct file *, fl_owner_t);
1124 extern void locks_remove_flock(struct file *);
1125 extern void locks_release_private(struct file_lock *);
1126 extern void posix_test_lock(struct file *, struct file_lock *);
1127 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1128 extern int posix_lock_file_wait(struct file *, struct file_lock *);
1129 extern int posix_unblock_lock(struct file *, struct file_lock *);
1130 extern int vfs_test_lock(struct file *, struct file_lock *);
1131 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
1132 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1133 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1134 extern int __break_lease(struct inode *inode, unsigned int flags);
1135 extern void lease_get_mtime(struct inode *, struct timespec *time);
1136 extern int generic_setlease(struct file *, long, struct file_lock **);
1137 extern int vfs_setlease(struct file *, long, struct file_lock **);
1138 extern int lease_modify(struct file_lock **, int);
1139 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1140 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1141 #else /* !CONFIG_FILE_LOCKING */
1142 static inline int fcntl_getlk(struct file *file, struct flock __user *user)
1144 return -EINVAL;
1147 static inline int fcntl_setlk(unsigned int fd, struct file *file,
1148 unsigned int cmd, struct flock __user *user)
1150 return -EACCES;
1153 #if BITS_PER_LONG == 32
1154 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
1156 return -EINVAL;
1159 static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1160 unsigned int cmd, struct flock64 __user *user)
1162 return -EACCES;
1164 #endif
1165 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1167 return 0;
1170 static inline int fcntl_getlease(struct file *filp)
1172 return 0;
1175 static inline void locks_init_lock(struct file_lock *fl)
1177 return;
1180 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1182 return;
1185 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1187 return;
1190 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1192 return;
1195 static inline void locks_remove_flock(struct file *filp)
1197 return;
1200 static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1202 return;
1205 static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1206 struct file_lock *conflock)
1208 return -ENOLCK;
1211 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
1213 return -ENOLCK;
1216 static inline int posix_unblock_lock(struct file *filp,
1217 struct file_lock *waiter)
1219 return -ENOENT;
1222 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1224 return 0;
1227 static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1228 struct file_lock *fl, struct file_lock *conf)
1230 return -ENOLCK;
1233 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1235 return 0;
1238 static inline int flock_lock_file_wait(struct file *filp,
1239 struct file_lock *request)
1241 return -ENOLCK;
1244 static inline int __break_lease(struct inode *inode, unsigned int mode)
1246 return 0;
1249 static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1251 return;
1254 static inline int generic_setlease(struct file *filp, long arg,
1255 struct file_lock **flp)
1257 return -EINVAL;
1260 static inline int vfs_setlease(struct file *filp, long arg,
1261 struct file_lock **lease)
1263 return -EINVAL;
1266 static inline int lease_modify(struct file_lock **before, int arg)
1268 return -EINVAL;
1271 static inline int lock_may_read(struct inode *inode, loff_t start,
1272 unsigned long len)
1274 return 1;
1277 static inline int lock_may_write(struct inode *inode, loff_t start,
1278 unsigned long len)
1280 return 1;
1283 #endif /* !CONFIG_FILE_LOCKING */
1286 struct fasync_struct {
1287 int magic;
1288 int fa_fd;
1289 struct fasync_struct *fa_next; /* singly linked list */
1290 struct file *fa_file;
1293 #define FASYNC_MAGIC 0x4601
1295 /* SMP safe fasync helpers: */
1296 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1297 /* can be called from interrupts */
1298 extern void kill_fasync(struct fasync_struct **, int, int);
1299 /* only for net: no internal synchronization */
1300 extern void __kill_fasync(struct fasync_struct *, int, int);
1302 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1303 extern int f_setown(struct file *filp, unsigned long arg, int force);
1304 extern void f_delown(struct file *filp);
1305 extern pid_t f_getown(struct file *filp);
1306 extern int send_sigurg(struct fown_struct *fown);
1309 * Umount options
1312 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1313 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1314 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1315 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1316 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1318 extern struct list_head super_blocks;
1319 extern spinlock_t sb_lock;
1321 #define sb_entry(list) list_entry((list), struct super_block, s_list)
1322 #define S_BIAS (1<<30)
1323 struct super_block {
1324 struct list_head s_list; /* Keep this first */
1325 dev_t s_dev; /* search index; _not_ kdev_t */
1326 unsigned long s_blocksize;
1327 unsigned char s_blocksize_bits;
1328 unsigned char s_dirt;
1329 loff_t s_maxbytes; /* Max file size */
1330 struct file_system_type *s_type;
1331 const struct super_operations *s_op;
1332 const struct dquot_operations *dq_op;
1333 const struct quotactl_ops *s_qcop;
1334 const struct export_operations *s_export_op;
1335 unsigned long s_flags;
1336 unsigned long s_magic;
1337 struct dentry *s_root;
1338 struct rw_semaphore s_umount;
1339 struct mutex s_lock;
1340 int s_count;
1341 int s_need_sync;
1342 atomic_t s_active;
1343 #ifdef CONFIG_SECURITY
1344 void *s_security;
1345 #endif
1346 struct xattr_handler **s_xattr;
1348 struct list_head s_inodes; /* all inodes */
1349 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1350 struct list_head s_files;
1351 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1352 struct list_head s_dentry_lru; /* unused dentry lru */
1353 int s_nr_dentry_unused; /* # of dentry on lru */
1355 struct block_device *s_bdev;
1356 struct backing_dev_info *s_bdi;
1357 struct mtd_info *s_mtd;
1358 struct list_head s_instances;
1359 struct quota_info s_dquot; /* Diskquota specific options */
1361 int s_frozen;
1362 wait_queue_head_t s_wait_unfrozen;
1364 char s_id[32]; /* Informational name */
1366 void *s_fs_info; /* Filesystem private info */
1367 fmode_t s_mode;
1370 * The next field is for VFS *only*. No filesystems have any business
1371 * even looking at it. You had been warned.
1373 struct mutex s_vfs_rename_mutex; /* Kludge */
1375 /* Granularity of c/m/atime in ns.
1376 Cannot be worse than a second */
1377 u32 s_time_gran;
1380 * Filesystem subtype. If non-empty the filesystem type field
1381 * in /proc/mounts will be "type.subtype"
1383 char *s_subtype;
1386 * Saved mount options for lazy filesystems using
1387 * generic_show_options()
1389 char *s_options;
1392 extern struct timespec current_fs_time(struct super_block *sb);
1395 * Snapshotting support.
1397 enum {
1398 SB_UNFROZEN = 0,
1399 SB_FREEZE_WRITE = 1,
1400 SB_FREEZE_TRANS = 2,
1403 #define vfs_check_frozen(sb, level) \
1404 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1406 #define get_fs_excl() atomic_inc(&current->fs_excl)
1407 #define put_fs_excl() atomic_dec(&current->fs_excl)
1408 #define has_fs_excl() atomic_read(&current->fs_excl)
1410 #define is_owner_or_cap(inode) \
1411 ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
1413 /* not quite ready to be deprecated, but... */
1414 extern void lock_super(struct super_block *);
1415 extern void unlock_super(struct super_block *);
1418 * VFS helper functions..
1420 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1421 extern int vfs_mkdir(struct inode *, struct dentry *, int);
1422 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
1423 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
1424 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1425 extern int vfs_rmdir(struct inode *, struct dentry *);
1426 extern int vfs_unlink(struct inode *, struct dentry *);
1427 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1430 * VFS dentry helper functions.
1432 extern void dentry_unhash(struct dentry *dentry);
1435 * VFS file helper functions.
1437 extern int file_permission(struct file *, int);
1440 * VFS FS_IOC_FIEMAP helper definitions.
1442 struct fiemap_extent_info {
1443 unsigned int fi_flags; /* Flags as passed from user */
1444 unsigned int fi_extents_mapped; /* Number of mapped extents */
1445 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1446 struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
1447 * array */
1449 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1450 u64 phys, u64 len, u32 flags);
1451 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1454 * File types
1456 * NOTE! These match bits 12..15 of stat.st_mode
1457 * (ie "(i_mode >> 12) & 15").
1459 #define DT_UNKNOWN 0
1460 #define DT_FIFO 1
1461 #define DT_CHR 2
1462 #define DT_DIR 4
1463 #define DT_BLK 6
1464 #define DT_REG 8
1465 #define DT_LNK 10
1466 #define DT_SOCK 12
1467 #define DT_WHT 14
1470 * This is the "filldir" function type, used by readdir() to let
1471 * the kernel specify what kind of dirent layout it wants to have.
1472 * This allows the kernel to read directories into kernel space or
1473 * to have different dirent layouts depending on the binary type.
1475 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1476 struct block_device_operations;
1478 /* These macros are for out of kernel modules to test that
1479 * the kernel supports the unlocked_ioctl and compat_ioctl
1480 * fields in struct file_operations. */
1481 #define HAVE_COMPAT_IOCTL 1
1482 #define HAVE_UNLOCKED_IOCTL 1
1485 * NOTE:
1486 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1487 * can be called without the big kernel lock held in all filesystems.
1489 struct file_operations {
1490 struct module *owner;
1491 loff_t (*llseek) (struct file *, loff_t, int);
1492 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1493 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1494 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1495 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1496 int (*readdir) (struct file *, void *, filldir_t);
1497 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1498 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1499 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1500 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1501 int (*mmap) (struct file *, struct vm_area_struct *);
1502 int (*open) (struct inode *, struct file *);
1503 int (*flush) (struct file *, fl_owner_t id);
1504 int (*release) (struct inode *, struct file *);
1505 int (*fsync) (struct file *, struct dentry *, int datasync);
1506 int (*aio_fsync) (struct kiocb *, int datasync);
1507 int (*fasync) (int, struct file *, int);
1508 int (*lock) (struct file *, int, struct file_lock *);
1509 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1510 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1511 int (*check_flags)(int);
1512 int (*flock) (struct file *, int, struct file_lock *);
1513 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1514 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1515 int (*setlease)(struct file *, long, struct file_lock **);
1518 struct inode_operations {
1519 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1520 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1521 int (*link) (struct dentry *,struct inode *,struct dentry *);
1522 int (*unlink) (struct inode *,struct dentry *);
1523 int (*symlink) (struct inode *,struct dentry *,const char *);
1524 int (*mkdir) (struct inode *,struct dentry *,int);
1525 int (*rmdir) (struct inode *,struct dentry *);
1526 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1527 int (*rename) (struct inode *, struct dentry *,
1528 struct inode *, struct dentry *);
1529 int (*readlink) (struct dentry *, char __user *,int);
1530 void * (*follow_link) (struct dentry *, struct nameidata *);
1531 void (*put_link) (struct dentry *, struct nameidata *, void *);
1532 void (*truncate) (struct inode *);
1533 int (*permission) (struct inode *, int);
1534 int (*check_acl)(struct inode *, int);
1535 int (*setattr) (struct dentry *, struct iattr *);
1536 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1537 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1538 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1539 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1540 int (*removexattr) (struct dentry *, const char *);
1541 void (*truncate_range)(struct inode *, loff_t, loff_t);
1542 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1543 loff_t len);
1544 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1545 u64 len);
1548 struct seq_file;
1550 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1551 unsigned long nr_segs, unsigned long fast_segs,
1552 struct iovec *fast_pointer,
1553 struct iovec **ret_pointer);
1555 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1556 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1557 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1558 unsigned long, loff_t *);
1559 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1560 unsigned long, loff_t *);
1562 struct super_operations {
1563 struct inode *(*alloc_inode)(struct super_block *sb);
1564 void (*destroy_inode)(struct inode *);
1566 void (*dirty_inode) (struct inode *);
1567 int (*write_inode) (struct inode *, int);
1568 void (*drop_inode) (struct inode *);
1569 void (*delete_inode) (struct inode *);
1570 void (*put_super) (struct super_block *);
1571 void (*write_super) (struct super_block *);
1572 int (*sync_fs)(struct super_block *sb, int wait);
1573 int (*freeze_fs) (struct super_block *);
1574 int (*unfreeze_fs) (struct super_block *);
1575 int (*statfs) (struct dentry *, struct kstatfs *);
1576 int (*remount_fs) (struct super_block *, int *, char *);
1577 void (*clear_inode) (struct inode *);
1578 void (*umount_begin) (struct super_block *);
1580 int (*show_options)(struct seq_file *, struct vfsmount *);
1581 int (*show_stats)(struct seq_file *, struct vfsmount *);
1582 #ifdef CONFIG_QUOTA
1583 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1584 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1585 #endif
1586 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1590 * Inode state bits. Protected by inode_lock.
1592 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1593 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1595 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1596 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1597 * various stages of removing an inode.
1599 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1601 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1602 * fdatasync(). i_atime is the usual cause.
1603 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1604 * these changes separately from I_DIRTY_SYNC so that we
1605 * don't have to write inode on fdatasync() when only
1606 * mtime has changed in it.
1607 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1608 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1609 * are cleared by unlock_new_inode(), called from iget().
1610 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1611 * is zero. I_FREEING must be set when I_WILL_FREE is
1612 * cleared.
1613 * I_FREEING Set when inode is about to be freed but still has dirty
1614 * pages or buffers attached or the inode itself is still
1615 * dirty.
1616 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1617 * and can be destroyed.
1619 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1620 * prohibited for many purposes. iget() must wait for
1621 * the inode to be completely released, then create it
1622 * anew. Other functions will just ignore such inodes,
1623 * if appropriate. I_LOCK is used for waiting.
1625 * I_LOCK Serves as both a mutex and completion notification.
1626 * New inodes set I_LOCK. If two processes both create
1627 * the same inode, one of them will release its inode and
1628 * wait for I_LOCK to be released before returning.
1629 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1630 * also cause waiting on I_LOCK, without I_LOCK actually
1631 * being set. find_inode() uses this to prevent returning
1632 * nearly-dead inodes.
1633 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
1634 * of inode dirty data. Having a separate lock for this
1635 * purpose reduces latency and prevents some filesystem-
1636 * specific deadlocks.
1638 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1639 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1640 * I_CLEAR? If not, why?
1642 #define I_DIRTY_SYNC 1
1643 #define I_DIRTY_DATASYNC 2
1644 #define I_DIRTY_PAGES 4
1645 #define I_NEW 8
1646 #define I_WILL_FREE 16
1647 #define I_FREEING 32
1648 #define I_CLEAR 64
1649 #define __I_LOCK 7
1650 #define I_LOCK (1 << __I_LOCK)
1651 #define __I_SYNC 8
1652 #define I_SYNC (1 << __I_SYNC)
1654 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1656 extern void __mark_inode_dirty(struct inode *, int);
1657 static inline void mark_inode_dirty(struct inode *inode)
1659 __mark_inode_dirty(inode, I_DIRTY);
1662 static inline void mark_inode_dirty_sync(struct inode *inode)
1664 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1668 * inc_nlink - directly increment an inode's link count
1669 * @inode: inode
1671 * This is a low-level filesystem helper to replace any
1672 * direct filesystem manipulation of i_nlink. Currently,
1673 * it is only here for parity with dec_nlink().
1675 static inline void inc_nlink(struct inode *inode)
1677 inode->i_nlink++;
1680 static inline void inode_inc_link_count(struct inode *inode)
1682 inc_nlink(inode);
1683 mark_inode_dirty(inode);
1687 * drop_nlink - directly drop an inode's link count
1688 * @inode: inode
1690 * This is a low-level filesystem helper to replace any
1691 * direct filesystem manipulation of i_nlink. In cases
1692 * where we are attempting to track writes to the
1693 * filesystem, a decrement to zero means an imminent
1694 * write when the file is truncated and actually unlinked
1695 * on the filesystem.
1697 static inline void drop_nlink(struct inode *inode)
1699 inode->i_nlink--;
1703 * clear_nlink - directly zero an inode's link count
1704 * @inode: inode
1706 * This is a low-level filesystem helper to replace any
1707 * direct filesystem manipulation of i_nlink. See
1708 * drop_nlink() for why we care about i_nlink hitting zero.
1710 static inline void clear_nlink(struct inode *inode)
1712 inode->i_nlink = 0;
1715 static inline void inode_dec_link_count(struct inode *inode)
1717 drop_nlink(inode);
1718 mark_inode_dirty(inode);
1722 * inode_inc_iversion - increments i_version
1723 * @inode: inode that need to be updated
1725 * Every time the inode is modified, the i_version field will be incremented.
1726 * The filesystem has to be mounted with i_version flag
1729 static inline void inode_inc_iversion(struct inode *inode)
1731 spin_lock(&inode->i_lock);
1732 inode->i_version++;
1733 spin_unlock(&inode->i_lock);
1736 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1737 static inline void file_accessed(struct file *file)
1739 if (!(file->f_flags & O_NOATIME))
1740 touch_atime(file->f_path.mnt, file->f_path.dentry);
1743 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1745 struct file_system_type {
1746 const char *name;
1747 int fs_flags;
1748 int (*get_sb) (struct file_system_type *, int,
1749 const char *, void *, struct vfsmount *);
1750 void (*kill_sb) (struct super_block *);
1751 struct module *owner;
1752 struct file_system_type * next;
1753 struct list_head fs_supers;
1755 struct lock_class_key s_lock_key;
1756 struct lock_class_key s_umount_key;
1758 struct lock_class_key i_lock_key;
1759 struct lock_class_key i_mutex_key;
1760 struct lock_class_key i_mutex_dir_key;
1761 struct lock_class_key i_alloc_sem_key;
1764 extern int get_sb_ns(struct file_system_type *fs_type, int flags, void *data,
1765 int (*fill_super)(struct super_block *, void *, int),
1766 struct vfsmount *mnt);
1767 extern int get_sb_bdev(struct file_system_type *fs_type,
1768 int flags, const char *dev_name, void *data,
1769 int (*fill_super)(struct super_block *, void *, int),
1770 struct vfsmount *mnt);
1771 extern int get_sb_single(struct file_system_type *fs_type,
1772 int flags, void *data,
1773 int (*fill_super)(struct super_block *, void *, int),
1774 struct vfsmount *mnt);
1775 extern int get_sb_nodev(struct file_system_type *fs_type,
1776 int flags, void *data,
1777 int (*fill_super)(struct super_block *, void *, int),
1778 struct vfsmount *mnt);
1779 void generic_shutdown_super(struct super_block *sb);
1780 void kill_block_super(struct super_block *sb);
1781 void kill_anon_super(struct super_block *sb);
1782 void kill_litter_super(struct super_block *sb);
1783 void deactivate_super(struct super_block *sb);
1784 void deactivate_locked_super(struct super_block *sb);
1785 int set_anon_super(struct super_block *s, void *data);
1786 struct super_block *sget(struct file_system_type *type,
1787 int (*test)(struct super_block *,void *),
1788 int (*set)(struct super_block *,void *),
1789 void *data);
1790 extern int get_sb_pseudo(struct file_system_type *, char *,
1791 const struct super_operations *ops, unsigned long,
1792 struct vfsmount *mnt);
1793 extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1794 int __put_super_and_need_restart(struct super_block *sb);
1795 void put_super(struct super_block *sb);
1797 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1798 #define fops_get(fops) \
1799 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1800 #define fops_put(fops) \
1801 do { if (fops) module_put((fops)->owner); } while(0)
1803 extern int register_filesystem(struct file_system_type *);
1804 extern int unregister_filesystem(struct file_system_type *);
1805 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1806 #define kern_mount(type) kern_mount_data(type, NULL)
1807 extern int may_umount_tree(struct vfsmount *);
1808 extern int may_umount(struct vfsmount *);
1809 extern long do_mount(char *, char *, char *, unsigned long, void *);
1810 extern struct vfsmount *collect_mounts(struct path *);
1811 extern void drop_collected_mounts(struct vfsmount *);
1813 extern int vfs_statfs(struct dentry *, struct kstatfs *);
1815 extern int current_umask(void);
1817 /* /sys/fs */
1818 extern struct kobject *fs_kobj;
1820 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1822 #define FLOCK_VERIFY_READ 1
1823 #define FLOCK_VERIFY_WRITE 2
1825 #ifdef CONFIG_FILE_LOCKING
1826 extern int locks_mandatory_locked(struct inode *);
1827 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1830 * Candidates for mandatory locking have the setgid bit set
1831 * but no group execute bit - an otherwise meaningless combination.
1834 static inline int __mandatory_lock(struct inode *ino)
1836 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1840 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1841 * otherwise these will be advisory locks
1844 static inline int mandatory_lock(struct inode *ino)
1846 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1849 static inline int locks_verify_locked(struct inode *inode)
1851 if (mandatory_lock(inode))
1852 return locks_mandatory_locked(inode);
1853 return 0;
1856 static inline int locks_verify_truncate(struct inode *inode,
1857 struct file *filp,
1858 loff_t size)
1860 if (inode->i_flock && mandatory_lock(inode))
1861 return locks_mandatory_area(
1862 FLOCK_VERIFY_WRITE, inode, filp,
1863 size < inode->i_size ? size : inode->i_size,
1864 (size < inode->i_size ? inode->i_size - size
1865 : size - inode->i_size)
1867 return 0;
1870 static inline int break_lease(struct inode *inode, unsigned int mode)
1872 if (inode->i_flock)
1873 return __break_lease(inode, mode);
1874 return 0;
1876 #else /* !CONFIG_FILE_LOCKING */
1877 static inline int locks_mandatory_locked(struct inode *inode)
1879 return 0;
1882 static inline int locks_mandatory_area(int rw, struct inode *inode,
1883 struct file *filp, loff_t offset,
1884 size_t count)
1886 return 0;
1889 static inline int __mandatory_lock(struct inode *inode)
1891 return 0;
1894 static inline int mandatory_lock(struct inode *inode)
1896 return 0;
1899 static inline int locks_verify_locked(struct inode *inode)
1901 return 0;
1904 static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
1905 size_t size)
1907 return 0;
1910 static inline int break_lease(struct inode *inode, unsigned int mode)
1912 return 0;
1915 #endif /* CONFIG_FILE_LOCKING */
1917 /* fs/open.c */
1919 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1920 struct file *filp);
1921 extern int do_fallocate(struct file *file, int mode, loff_t offset,
1922 loff_t len);
1923 extern long do_sys_open(int dfd, const char __user *filename, int flags,
1924 int mode);
1925 extern struct file *filp_open(const char *, int, int);
1926 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
1927 const struct cred *);
1928 extern int filp_close(struct file *, fl_owner_t id);
1929 extern char * getname(const char __user *);
1931 /* fs/ioctl.c */
1933 extern int ioctl_preallocate(struct file *filp, void __user *argp);
1935 /* fs/dcache.c */
1936 extern void __init vfs_caches_init_early(void);
1937 extern void __init vfs_caches_init(unsigned long);
1939 extern struct kmem_cache *names_cachep;
1941 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
1942 #define __getname() __getname_gfp(GFP_KERNEL)
1943 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1944 #ifndef CONFIG_AUDITSYSCALL
1945 #define putname(name) __putname(name)
1946 #else
1947 extern void putname(const char *name);
1948 #endif
1950 #ifdef CONFIG_BLOCK
1951 extern int register_blkdev(unsigned int, const char *);
1952 extern void unregister_blkdev(unsigned int, const char *);
1953 extern struct block_device *bdget(dev_t);
1954 extern struct block_device *bdgrab(struct block_device *bdev);
1955 extern void bd_set_size(struct block_device *, loff_t size);
1956 extern void bd_forget(struct inode *inode);
1957 extern void bdput(struct block_device *);
1958 extern struct block_device *open_by_devnum(dev_t, fmode_t);
1959 extern void invalidate_bdev(struct block_device *);
1960 extern int sync_blockdev(struct block_device *bdev);
1961 extern struct super_block *freeze_bdev(struct block_device *);
1962 extern void emergency_thaw_all(void);
1963 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
1964 extern int fsync_bdev(struct block_device *);
1965 #else
1966 static inline void bd_forget(struct inode *inode) {}
1967 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
1968 static inline void invalidate_bdev(struct block_device *bdev) {}
1970 static inline struct super_block *freeze_bdev(struct block_device *sb)
1972 return NULL;
1975 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
1977 return 0;
1979 #endif
1980 extern int sync_filesystem(struct super_block *);
1981 extern const struct file_operations def_blk_fops;
1982 extern const struct file_operations def_chr_fops;
1983 extern const struct file_operations bad_sock_fops;
1984 extern const struct file_operations def_fifo_fops;
1985 #ifdef CONFIG_BLOCK
1986 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1987 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
1988 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1989 extern int blkdev_get(struct block_device *, fmode_t);
1990 extern int blkdev_put(struct block_device *, fmode_t);
1991 extern int bd_claim(struct block_device *, void *);
1992 extern void bd_release(struct block_device *);
1993 #ifdef CONFIG_SYSFS
1994 extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1995 extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1996 #else
1997 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1998 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1999 #endif
2000 #endif
2002 /* fs/char_dev.c */
2003 #define CHRDEV_MAJOR_HASH_SIZE 255
2004 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
2005 extern int register_chrdev_region(dev_t, unsigned, const char *);
2006 extern int __register_chrdev(unsigned int major, unsigned int baseminor,
2007 unsigned int count, const char *name,
2008 const struct file_operations *fops);
2009 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
2010 unsigned int count, const char *name);
2011 extern void unregister_chrdev_region(dev_t, unsigned);
2012 extern void chrdev_show(struct seq_file *,off_t);
2014 static inline int register_chrdev(unsigned int major, const char *name,
2015 const struct file_operations *fops)
2017 return __register_chrdev(major, 0, 256, name, fops);
2020 static inline void unregister_chrdev(unsigned int major, const char *name)
2022 __unregister_chrdev(major, 0, 256, name);
2025 /* fs/block_dev.c */
2026 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2027 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2029 #ifdef CONFIG_BLOCK
2030 #define BLKDEV_MAJOR_HASH_SIZE 255
2031 extern const char *__bdevname(dev_t, char *buffer);
2032 extern const char *bdevname(struct block_device *bdev, char *buffer);
2033 extern struct block_device *lookup_bdev(const char *);
2034 extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
2035 extern void close_bdev_exclusive(struct block_device *, fmode_t);
2036 extern void blkdev_show(struct seq_file *,off_t);
2038 #else
2039 #define BLKDEV_MAJOR_HASH_SIZE 0
2040 #endif
2042 extern void init_special_inode(struct inode *, umode_t, dev_t);
2044 /* Invalid inode operations -- fs/bad_inode.c */
2045 extern void make_bad_inode(struct inode *);
2046 extern int is_bad_inode(struct inode *);
2048 extern const struct file_operations read_pipefifo_fops;
2049 extern const struct file_operations write_pipefifo_fops;
2050 extern const struct file_operations rdwr_pipefifo_fops;
2052 extern int fs_may_remount_ro(struct super_block *);
2054 #ifdef CONFIG_BLOCK
2056 * return READ, READA, or WRITE
2058 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2061 * return data direction, READ or WRITE
2063 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2065 extern void check_disk_size_change(struct gendisk *disk,
2066 struct block_device *bdev);
2067 extern int revalidate_disk(struct gendisk *);
2068 extern int check_disk_change(struct block_device *);
2069 extern int __invalidate_device(struct block_device *);
2070 extern int invalidate_partition(struct gendisk *, int);
2071 #endif
2072 extern int invalidate_inodes(struct super_block *);
2073 unsigned long invalidate_mapping_pages(struct address_space *mapping,
2074 pgoff_t start, pgoff_t end);
2076 static inline unsigned long __deprecated
2077 invalidate_inode_pages(struct address_space *mapping)
2079 return invalidate_mapping_pages(mapping, 0, ~0UL);
2082 static inline void invalidate_remote_inode(struct inode *inode)
2084 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2085 S_ISLNK(inode->i_mode))
2086 invalidate_mapping_pages(inode->i_mapping, 0, -1);
2088 extern int invalidate_inode_pages2(struct address_space *mapping);
2089 extern int invalidate_inode_pages2_range(struct address_space *mapping,
2090 pgoff_t start, pgoff_t end);
2091 extern int write_inode_now(struct inode *, int);
2092 extern int filemap_fdatawrite(struct address_space *);
2093 extern int filemap_flush(struct address_space *);
2094 extern int filemap_fdatawait(struct address_space *);
2095 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
2096 loff_t lend);
2097 extern int filemap_write_and_wait(struct address_space *mapping);
2098 extern int filemap_write_and_wait_range(struct address_space *mapping,
2099 loff_t lstart, loff_t lend);
2100 extern int wait_on_page_writeback_range(struct address_space *mapping,
2101 pgoff_t start, pgoff_t end);
2102 extern int __filemap_fdatawrite_range(struct address_space *mapping,
2103 loff_t start, loff_t end, int sync_mode);
2104 extern int filemap_fdatawrite_range(struct address_space *mapping,
2105 loff_t start, loff_t end);
2107 extern int vfs_fsync_range(struct file *file, struct dentry *dentry,
2108 loff_t start, loff_t end, int datasync);
2109 extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync);
2110 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
2111 extern void sync_supers(void);
2112 extern void emergency_sync(void);
2113 extern void emergency_remount(void);
2114 #ifdef CONFIG_BLOCK
2115 extern sector_t bmap(struct inode *, sector_t);
2116 #endif
2117 extern int notify_change(struct dentry *, struct iattr *);
2118 extern int inode_permission(struct inode *, int);
2119 extern int generic_permission(struct inode *, int,
2120 int (*check_acl)(struct inode *, int));
2122 static inline bool execute_ok(struct inode *inode)
2124 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2127 extern int get_write_access(struct inode *);
2128 extern int deny_write_access(struct file *);
2129 static inline void put_write_access(struct inode * inode)
2131 atomic_dec(&inode->i_writecount);
2133 static inline void allow_write_access(struct file *file)
2135 if (file)
2136 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
2138 extern int do_pipe_flags(int *, int);
2139 extern struct file *create_read_pipe(struct file *f, int flags);
2140 extern struct file *create_write_pipe(int flags);
2141 extern void free_write_pipe(struct file *);
2143 extern struct file *do_filp_open(int dfd, const char *pathname,
2144 int open_flag, int mode, int acc_mode);
2145 extern int may_open(struct path *, int, int);
2147 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
2148 extern struct file * open_exec(const char *);
2150 /* fs/dcache.c -- generic fs support functions */
2151 extern int is_subdir(struct dentry *, struct dentry *);
2152 extern ino_t find_inode_number(struct dentry *, struct qstr *);
2154 #include <linux/err.h>
2156 /* needed for stackable file system support */
2157 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
2159 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
2161 extern int inode_init_always(struct super_block *, struct inode *);
2162 extern void inode_init_once(struct inode *);
2163 extern void address_space_init_once(struct address_space *mapping);
2164 extern void inode_add_to_lists(struct super_block *, struct inode *);
2165 extern void iput(struct inode *);
2166 extern struct inode * igrab(struct inode *);
2167 extern ino_t iunique(struct super_block *, ino_t);
2168 extern int inode_needs_sync(struct inode *inode);
2169 extern void generic_delete_inode(struct inode *inode);
2170 extern void generic_drop_inode(struct inode *inode);
2171 extern int generic_detach_inode(struct inode *inode);
2173 extern struct inode *ilookup5_nowait(struct super_block *sb,
2174 unsigned long hashval, int (*test)(struct inode *, void *),
2175 void *data);
2176 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2177 int (*test)(struct inode *, void *), void *data);
2178 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2180 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2181 extern struct inode * iget_locked(struct super_block *, unsigned long);
2182 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2183 extern int insert_inode_locked(struct inode *);
2184 extern void unlock_new_inode(struct inode *);
2186 extern void __iget(struct inode * inode);
2187 extern void iget_failed(struct inode *);
2188 extern void clear_inode(struct inode *);
2189 extern void destroy_inode(struct inode *);
2190 extern void __destroy_inode(struct inode *);
2191 extern struct inode *new_inode(struct super_block *);
2192 extern int should_remove_suid(struct dentry *);
2193 extern int file_remove_suid(struct file *);
2195 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2196 extern void remove_inode_hash(struct inode *);
2197 static inline void insert_inode_hash(struct inode *inode) {
2198 __insert_inode_hash(inode, inode->i_ino);
2201 extern struct file * get_empty_filp(void);
2202 extern void file_move(struct file *f, struct list_head *list);
2203 extern void file_kill(struct file *f);
2204 #ifdef CONFIG_BLOCK
2205 struct bio;
2206 extern void submit_bio(int, struct bio *);
2207 extern int bdev_read_only(struct block_device *);
2208 #endif
2209 extern int set_blocksize(struct block_device *, int);
2210 extern int sb_set_blocksize(struct super_block *, int);
2211 extern int sb_min_blocksize(struct super_block *, int);
2213 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2214 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2215 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
2216 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2217 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2218 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
2219 loff_t *);
2220 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2221 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
2222 unsigned long *, loff_t, loff_t *, size_t, size_t);
2223 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
2224 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2225 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2226 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2227 extern int generic_segment_checks(const struct iovec *iov,
2228 unsigned long *nr_segs, size_t *count, int access_flags);
2230 /* fs/block_dev.c */
2231 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
2232 unsigned long nr_segs, loff_t pos);
2233 extern int block_fsync(struct file *filp, struct dentry *dentry, int datasync);
2235 /* fs/splice.c */
2236 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
2237 struct pipe_inode_info *, size_t, unsigned int);
2238 extern ssize_t default_file_splice_read(struct file *, loff_t *,
2239 struct pipe_inode_info *, size_t, unsigned int);
2240 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2241 struct file *, loff_t *, size_t, unsigned int);
2242 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2243 struct file *out, loff_t *, size_t len, unsigned int flags);
2244 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
2245 size_t len, unsigned int flags);
2247 extern void
2248 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2249 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
2250 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
2251 extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
2252 int origin);
2253 extern int generic_file_open(struct inode * inode, struct file * filp);
2254 extern int nonseekable_open(struct inode * inode, struct file * filp);
2256 #ifdef CONFIG_FS_XIP
2257 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
2258 loff_t *ppos);
2259 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2260 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2261 size_t len, loff_t *ppos);
2262 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2263 #else
2264 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2266 return 0;
2268 #endif
2270 #ifdef CONFIG_BLOCK
2271 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2272 struct block_device *bdev, const struct iovec *iov, loff_t offset,
2273 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
2274 int lock_type);
2276 enum {
2277 DIO_LOCKING = 1, /* need locking between buffered and direct access */
2278 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
2279 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
2282 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2283 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2284 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2285 dio_iodone_t end_io)
2287 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2288 nr_segs, get_block, end_io, DIO_LOCKING);
2291 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
2292 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2293 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2294 dio_iodone_t end_io)
2296 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2297 nr_segs, get_block, end_io, DIO_NO_LOCKING);
2300 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
2301 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2302 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2303 dio_iodone_t end_io)
2305 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2306 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
2308 #endif
2310 extern const struct file_operations generic_ro_fops;
2312 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2314 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2315 extern int vfs_follow_link(struct nameidata *, const char *);
2316 extern int page_readlink(struct dentry *, char __user *, int);
2317 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2318 extern void page_put_link(struct dentry *, struct nameidata *, void *);
2319 extern int __page_symlink(struct inode *inode, const char *symname, int len,
2320 int nofs);
2321 extern int page_symlink(struct inode *inode, const char *symname, int len);
2322 extern const struct inode_operations page_symlink_inode_operations;
2323 extern int generic_readlink(struct dentry *, char __user *, int);
2324 extern void generic_fillattr(struct inode *, struct kstat *);
2325 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2326 void __inode_add_bytes(struct inode *inode, loff_t bytes);
2327 void inode_add_bytes(struct inode *inode, loff_t bytes);
2328 void inode_sub_bytes(struct inode *inode, loff_t bytes);
2329 loff_t inode_get_bytes(struct inode *inode);
2330 void inode_set_bytes(struct inode *inode, loff_t bytes);
2332 extern int vfs_readdir(struct file *, filldir_t, void *);
2334 extern int vfs_stat(char __user *, struct kstat *);
2335 extern int vfs_lstat(char __user *, struct kstat *);
2336 extern int vfs_fstat(unsigned int, struct kstat *);
2337 extern int vfs_fstatat(int , char __user *, struct kstat *, int);
2339 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2340 unsigned long arg);
2341 extern int __generic_block_fiemap(struct inode *inode,
2342 struct fiemap_extent_info *fieinfo, u64 start,
2343 u64 len, get_block_t *get_block);
2344 extern int generic_block_fiemap(struct inode *inode,
2345 struct fiemap_extent_info *fieinfo, u64 start,
2346 u64 len, get_block_t *get_block);
2348 extern void get_filesystem(struct file_system_type *fs);
2349 extern void put_filesystem(struct file_system_type *fs);
2350 extern struct file_system_type *get_fs_type(const char *name);
2351 extern struct super_block *get_super(struct block_device *);
2352 extern struct super_block *get_active_super(struct block_device *bdev);
2353 extern struct super_block *user_get_super(dev_t);
2354 extern void drop_super(struct super_block *sb);
2356 extern int dcache_dir_open(struct inode *, struct file *);
2357 extern int dcache_dir_close(struct inode *, struct file *);
2358 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2359 extern int dcache_readdir(struct file *, void *, filldir_t);
2360 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2361 extern int simple_statfs(struct dentry *, struct kstatfs *);
2362 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2363 extern int simple_unlink(struct inode *, struct dentry *);
2364 extern int simple_rmdir(struct inode *, struct dentry *);
2365 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2366 extern int simple_sync_file(struct file *, struct dentry *, int);
2367 extern int simple_empty(struct dentry *);
2368 extern int simple_readpage(struct file *file, struct page *page);
2369 extern int simple_prepare_write(struct file *file, struct page *page,
2370 unsigned offset, unsigned to);
2371 extern int simple_write_begin(struct file *file, struct address_space *mapping,
2372 loff_t pos, unsigned len, unsigned flags,
2373 struct page **pagep, void **fsdata);
2374 extern int simple_write_end(struct file *file, struct address_space *mapping,
2375 loff_t pos, unsigned len, unsigned copied,
2376 struct page *page, void *fsdata);
2378 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2379 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2380 extern const struct file_operations simple_dir_operations;
2381 extern const struct inode_operations simple_dir_inode_operations;
2382 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2383 struct dentry *d_alloc_name(struct dentry *, const char *);
2384 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2385 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
2386 extern void simple_release_fs(struct vfsmount **mount, int *count);
2388 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2389 loff_t *ppos, const void *from, size_t available);
2391 extern int simple_fsync(struct file *, struct dentry *, int);
2393 #ifdef CONFIG_MIGRATION
2394 extern int buffer_migrate_page(struct address_space *,
2395 struct page *, struct page *);
2396 #else
2397 #define buffer_migrate_page NULL
2398 #endif
2400 extern int inode_change_ok(const struct inode *, struct iattr *);
2401 extern int inode_newsize_ok(const struct inode *, loff_t offset);
2402 extern int __must_check inode_setattr(struct inode *, struct iattr *);
2404 extern void file_update_time(struct file *file);
2406 extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2407 extern void save_mount_options(struct super_block *sb, char *options);
2408 extern void replace_mount_options(struct super_block *sb, char *options);
2410 static inline ino_t parent_ino(struct dentry *dentry)
2412 ino_t res;
2414 spin_lock(&dentry->d_lock);
2415 res = dentry->d_parent->d_inode->i_ino;
2416 spin_unlock(&dentry->d_lock);
2417 return res;
2420 /* Transaction based IO helpers */
2423 * An argresp is stored in an allocated page and holds the
2424 * size of the argument or response, along with its content
2426 struct simple_transaction_argresp {
2427 ssize_t size;
2428 char data[0];
2431 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2433 char *simple_transaction_get(struct file *file, const char __user *buf,
2434 size_t size);
2435 ssize_t simple_transaction_read(struct file *file, char __user *buf,
2436 size_t size, loff_t *pos);
2437 int simple_transaction_release(struct inode *inode, struct file *file);
2439 void simple_transaction_set(struct file *file, size_t n);
2442 * simple attribute files
2444 * These attributes behave similar to those in sysfs:
2446 * Writing to an attribute immediately sets a value, an open file can be
2447 * written to multiple times.
2449 * Reading from an attribute creates a buffer from the value that might get
2450 * read with multiple read calls. When the attribute has been read
2451 * completely, no further read calls are possible until the file is opened
2452 * again.
2454 * All attributes contain a text representation of a numeric value
2455 * that are accessed with the get() and set() functions.
2457 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2458 static int __fops ## _open(struct inode *inode, struct file *file) \
2460 __simple_attr_check_format(__fmt, 0ull); \
2461 return simple_attr_open(inode, file, __get, __set, __fmt); \
2463 static const struct file_operations __fops = { \
2464 .owner = THIS_MODULE, \
2465 .open = __fops ## _open, \
2466 .release = simple_attr_release, \
2467 .read = simple_attr_read, \
2468 .write = simple_attr_write, \
2471 static inline void __attribute__((format(printf, 1, 2)))
2472 __simple_attr_check_format(const char *fmt, ...)
2474 /* don't do anything, just let the compiler check the arguments; */
2477 int simple_attr_open(struct inode *inode, struct file *file,
2478 int (*get)(void *, u64 *), int (*set)(void *, u64),
2479 const char *fmt);
2480 int simple_attr_release(struct inode *inode, struct file *file);
2481 ssize_t simple_attr_read(struct file *file, char __user *buf,
2482 size_t len, loff_t *ppos);
2483 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2484 size_t len, loff_t *ppos);
2486 struct ctl_table;
2487 int proc_nr_files(struct ctl_table *table, int write,
2488 void __user *buffer, size_t *lenp, loff_t *ppos);
2490 int __init get_filesystem_list(char *buf);
2492 #endif /* __KERNEL__ */
2493 #endif /* _LINUX_FS_H */