Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/linux-2.6-openrd.git] / include / linux / fs.h
blob9147ca88f253ec1bd35b70b5313cd9f63c0a61d5
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)
91 * The below are the various read and write types that we support. Some of
92 * them include behavioral modifiers that send information down to the
93 * block layer and IO scheduler. Terminology:
95 * The block layer uses device plugging to defer IO a little bit, in
96 * the hope that we will see more IO very shortly. This increases
97 * coalescing of adjacent IO and thus reduces the number of IOs we
98 * have to send to the device. It also allows for better queuing,
99 * if the IO isn't mergeable. If the caller is going to be waiting
100 * for the IO, then he must ensure that the device is unplugged so
101 * that the IO is dispatched to the driver.
103 * All IO is handled async in Linux. This is fine for background
104 * writes, but for reads or writes that someone waits for completion
105 * on, we want to notify the block layer and IO scheduler so that they
106 * know about it. That allows them to make better scheduling
107 * decisions. So when the below references 'sync' and 'async', it
108 * is referencing this priority hint.
110 * With that in mind, the available types are:
112 * READ A normal read operation. Device will be plugged.
113 * READ_SYNC A synchronous read. Device is not plugged, caller can
114 * immediately wait on this read without caring about
115 * unplugging.
116 * READA Used for read-ahead operations. Lower priority, and the
117 * block layer could (in theory) choose to ignore this
118 * request if it runs into resource problems.
119 * WRITE A normal async write. Device will be plugged.
120 * SWRITE Like WRITE, but a special case for ll_rw_block() that
121 * tells it to lock the buffer first. Normally a buffer
122 * must be locked before doing IO.
123 * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down
124 * the hint that someone will be waiting on this IO
125 * shortly. The device must still be unplugged explicitly,
126 * WRITE_SYNC_PLUG does not do this as we could be
127 * submitting more writes before we actually wait on any
128 * of them.
129 * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device
130 * immediately after submission. The write equivalent
131 * of READ_SYNC.
132 * WRITE_ODIRECT_PLUG Special case write for O_DIRECT only.
133 * SWRITE_SYNC
134 * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
135 * See SWRITE.
136 * WRITE_BARRIER Like WRITE, but tells the block layer that all
137 * previously submitted writes must be safely on storage
138 * before this one is started. Also guarantees that when
139 * this write is complete, it itself is also safely on
140 * storage. Prevents reordering of writes on both sides
141 * of this IO.
144 #define RW_MASK 1
145 #define RWA_MASK 2
146 #define READ 0
147 #define WRITE 1
148 #define READA 2 /* read-ahead - don't block if no resources */
149 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
150 #define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
151 #define READ_META (READ | (1 << BIO_RW_META))
152 #define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
153 #define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
154 #define WRITE_ODIRECT_PLUG (WRITE | (1 << BIO_RW_SYNCIO))
155 #define WRITE_META (WRITE | (1 << BIO_RW_META))
156 #define SWRITE_SYNC_PLUG \
157 (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
158 #define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
159 #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
162 * These aren't really reads or writes, they pass down information about
163 * parts of device that are now unused by the file system.
165 #define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
166 #define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))
168 #define SEL_IN 1
169 #define SEL_OUT 2
170 #define SEL_EX 4
172 /* public flags for file_system_type */
173 #define FS_REQUIRES_DEV 1
174 #define FS_BINARY_MOUNTDATA 2
175 #define FS_HAS_SUBTYPE 4
176 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
177 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
178 * during rename() internally.
182 * These are the fs-independent mount-flags: up to 32 flags are supported
184 #define MS_RDONLY 1 /* Mount read-only */
185 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
186 #define MS_NODEV 4 /* Disallow access to device special files */
187 #define MS_NOEXEC 8 /* Disallow program execution */
188 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
189 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
190 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
191 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
192 #define MS_NOATIME 1024 /* Do not update access times. */
193 #define MS_NODIRATIME 2048 /* Do not update directory access times */
194 #define MS_BIND 4096
195 #define MS_MOVE 8192
196 #define MS_REC 16384
197 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
198 MS_VERBOSE is deprecated. */
199 #define MS_SILENT 32768
200 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
201 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
202 #define MS_PRIVATE (1<<18) /* change to private */
203 #define MS_SLAVE (1<<19) /* change to slave */
204 #define MS_SHARED (1<<20) /* change to shared */
205 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
206 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
207 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
208 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
209 #define MS_ACTIVE (1<<30)
210 #define MS_NOUSER (1<<31)
213 * Superblock flags that can be altered by MS_REMOUNT
215 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
218 * Old magic mount flag and mask
220 #define MS_MGC_VAL 0xC0ED0000
221 #define MS_MGC_MSK 0xffff0000
223 /* Inode flags - they have nothing to superblock flags now */
225 #define S_SYNC 1 /* Writes are synced at once */
226 #define S_NOATIME 2 /* Do not update access times */
227 #define S_APPEND 4 /* Append-only file */
228 #define S_IMMUTABLE 8 /* Immutable file */
229 #define S_DEAD 16 /* removed, but still open directory */
230 #define S_NOQUOTA 32 /* Inode is not counted to quota */
231 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
232 #define S_NOCMTIME 128 /* Do not update file c/mtime */
233 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
234 #define S_PRIVATE 512 /* Inode is fs-internal */
237 * Note that nosuid etc flags are inode-specific: setting some file-system
238 * flags just means all the inodes inherit those flags by default. It might be
239 * possible to override it selectively if you really wanted to with some
240 * ioctl() that is not currently implemented.
242 * Exception: MS_RDONLY is always applied to the entire file system.
244 * Unfortunately, it is possible to change a filesystems flags with it mounted
245 * with files in use. This means that all of the inodes will not have their
246 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
247 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
249 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
251 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
252 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
253 ((inode)->i_flags & S_SYNC))
254 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
255 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
256 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
257 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
258 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
260 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
261 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
262 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
263 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
265 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
266 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
267 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
268 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
270 /* the read-only stuff doesn't really belong here, but any other place is
271 probably as bad and I don't want to create yet another include file. */
273 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
274 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
275 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
276 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
277 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
278 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
279 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
280 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
281 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
282 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
283 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
284 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
285 #if 0
286 #define BLKPG _IO(0x12,105)/* See blkpg.h */
288 /* Some people are morons. Do not use sizeof! */
290 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
291 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
292 /* This was here just to show that the number is taken -
293 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
294 #endif
295 /* A jump here: 108-111 have been used for various private purposes. */
296 #define BLKBSZGET _IOR(0x12,112,size_t)
297 #define BLKBSZSET _IOW(0x12,113,size_t)
298 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
299 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
300 #define BLKTRACESTART _IO(0x12,116)
301 #define BLKTRACESTOP _IO(0x12,117)
302 #define BLKTRACETEARDOWN _IO(0x12,118)
303 #define BLKDISCARD _IO(0x12,119)
304 #define BLKIOMIN _IO(0x12,120)
305 #define BLKIOOPT _IO(0x12,121)
306 #define BLKALIGNOFF _IO(0x12,122)
307 #define BLKPBSZGET _IO(0x12,123)
308 #define BLKDISCARDZEROES _IO(0x12,124)
310 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
311 #define FIBMAP _IO(0x00,1) /* bmap access */
312 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
313 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
314 #define FITHAW _IOWR('X', 120, int) /* Thaw */
316 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
317 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
318 #define FS_IOC_GETVERSION _IOR('v', 1, long)
319 #define FS_IOC_SETVERSION _IOW('v', 2, long)
320 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
321 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
322 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
323 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
324 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
327 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
329 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
330 #define FS_UNRM_FL 0x00000002 /* Undelete */
331 #define FS_COMPR_FL 0x00000004 /* Compress file */
332 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
333 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
334 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
335 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
336 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
337 /* Reserved for compression usage... */
338 #define FS_DIRTY_FL 0x00000100
339 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
340 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
341 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
342 /* End compression flags --- maybe not all used */
343 #define FS_BTREE_FL 0x00001000 /* btree format dir */
344 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
345 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
346 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
347 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
348 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
349 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
350 #define FS_EXTENT_FL 0x00080000 /* Extents */
351 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
352 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
354 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
355 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
358 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
359 #define SYNC_FILE_RANGE_WRITE 2
360 #define SYNC_FILE_RANGE_WAIT_AFTER 4
362 #ifdef __KERNEL__
364 #include <linux/linkage.h>
365 #include <linux/wait.h>
366 #include <linux/types.h>
367 #include <linux/kdev_t.h>
368 #include <linux/dcache.h>
369 #include <linux/path.h>
370 #include <linux/stat.h>
371 #include <linux/cache.h>
372 #include <linux/kobject.h>
373 #include <linux/list.h>
374 #include <linux/radix-tree.h>
375 #include <linux/prio_tree.h>
376 #include <linux/init.h>
377 #include <linux/pid.h>
378 #include <linux/mutex.h>
379 #include <linux/capability.h>
380 #include <linux/semaphore.h>
381 #include <linux/fiemap.h>
383 #include <asm/atomic.h>
384 #include <asm/byteorder.h>
386 struct export_operations;
387 struct hd_geometry;
388 struct iovec;
389 struct nameidata;
390 struct kiocb;
391 struct pipe_inode_info;
392 struct poll_table_struct;
393 struct kstatfs;
394 struct vm_area_struct;
395 struct vfsmount;
396 struct cred;
398 extern void __init inode_init(void);
399 extern void __init inode_init_early(void);
400 extern void __init files_init(unsigned long);
402 extern struct files_stat_struct files_stat;
403 extern int get_max_files(void);
404 extern int sysctl_nr_open;
405 extern struct inodes_stat_t inodes_stat;
406 extern int leases_enable, lease_break_time;
407 #ifdef CONFIG_DNOTIFY
408 extern int dir_notify_enable;
409 #endif
411 struct buffer_head;
412 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
413 struct buffer_head *bh_result, int create);
414 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
415 ssize_t bytes, void *private);
418 * Attribute flags. These should be or-ed together to figure out what
419 * has been changed!
421 #define ATTR_MODE (1 << 0)
422 #define ATTR_UID (1 << 1)
423 #define ATTR_GID (1 << 2)
424 #define ATTR_SIZE (1 << 3)
425 #define ATTR_ATIME (1 << 4)
426 #define ATTR_MTIME (1 << 5)
427 #define ATTR_CTIME (1 << 6)
428 #define ATTR_ATIME_SET (1 << 7)
429 #define ATTR_MTIME_SET (1 << 8)
430 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
431 #define ATTR_ATTR_FLAG (1 << 10)
432 #define ATTR_KILL_SUID (1 << 11)
433 #define ATTR_KILL_SGID (1 << 12)
434 #define ATTR_FILE (1 << 13)
435 #define ATTR_KILL_PRIV (1 << 14)
436 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
437 #define ATTR_TIMES_SET (1 << 16)
440 * This is the Inode Attributes structure, used for notify_change(). It
441 * uses the above definitions as flags, to know which values have changed.
442 * Also, in this manner, a Filesystem can look at only the values it cares
443 * about. Basically, these are the attributes that the VFS layer can
444 * request to change from the FS layer.
446 * Derek Atkins <warlord@MIT.EDU> 94-10-20
448 struct iattr {
449 unsigned int ia_valid;
450 umode_t ia_mode;
451 uid_t ia_uid;
452 gid_t ia_gid;
453 loff_t ia_size;
454 struct timespec ia_atime;
455 struct timespec ia_mtime;
456 struct timespec ia_ctime;
459 * Not an attribute, but an auxilary info for filesystems wanting to
460 * implement an ftruncate() like method. NOTE: filesystem should
461 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
463 struct file *ia_file;
467 * Includes for diskquotas.
469 #include <linux/quota.h>
471 /**
472 * enum positive_aop_returns - aop return codes with specific semantics
474 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
475 * completed, that the page is still locked, and
476 * should be considered active. The VM uses this hint
477 * to return the page to the active list -- it won't
478 * be a candidate for writeback again in the near
479 * future. Other callers must be careful to unlock
480 * the page if they get this return. Returned by
481 * writepage();
483 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
484 * unlocked it and the page might have been truncated.
485 * The caller should back up to acquiring a new page and
486 * trying again. The aop will be taking reasonable
487 * precautions not to livelock. If the caller held a page
488 * reference, it should drop it before retrying. Returned
489 * by readpage().
491 * address_space_operation functions return these large constants to indicate
492 * special semantics to the caller. These are much larger than the bytes in a
493 * page to allow for functions that return the number of bytes operated on in a
494 * given page.
497 enum positive_aop_returns {
498 AOP_WRITEPAGE_ACTIVATE = 0x80000,
499 AOP_TRUNCATED_PAGE = 0x80001,
502 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
503 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
504 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
505 * helper code (eg buffer layer)
506 * to clear GFP_FS from alloc */
509 * oh the beauties of C type declarations.
511 struct page;
512 struct address_space;
513 struct writeback_control;
515 struct iov_iter {
516 const struct iovec *iov;
517 unsigned long nr_segs;
518 size_t iov_offset;
519 size_t count;
522 size_t iov_iter_copy_from_user_atomic(struct page *page,
523 struct iov_iter *i, unsigned long offset, size_t bytes);
524 size_t iov_iter_copy_from_user(struct page *page,
525 struct iov_iter *i, unsigned long offset, size_t bytes);
526 void iov_iter_advance(struct iov_iter *i, size_t bytes);
527 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
528 size_t iov_iter_single_seg_count(struct iov_iter *i);
530 static inline void iov_iter_init(struct iov_iter *i,
531 const struct iovec *iov, unsigned long nr_segs,
532 size_t count, size_t written)
534 i->iov = iov;
535 i->nr_segs = nr_segs;
536 i->iov_offset = 0;
537 i->count = count + written;
539 iov_iter_advance(i, written);
542 static inline size_t iov_iter_count(struct iov_iter *i)
544 return i->count;
548 * "descriptor" for what we're up to with a read.
549 * This allows us to use the same read code yet
550 * have multiple different users of the data that
551 * we read from a file.
553 * The simplest case just copies the data to user
554 * mode.
556 typedef struct {
557 size_t written;
558 size_t count;
559 union {
560 char __user *buf;
561 void *data;
562 } arg;
563 int error;
564 } read_descriptor_t;
566 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
567 unsigned long, unsigned long);
569 struct address_space_operations {
570 int (*writepage)(struct page *page, struct writeback_control *wbc);
571 int (*readpage)(struct file *, struct page *);
572 void (*sync_page)(struct page *);
574 /* Write back some dirty pages from this mapping. */
575 int (*writepages)(struct address_space *, struct writeback_control *);
577 /* Set a page dirty. Return true if this dirtied it */
578 int (*set_page_dirty)(struct page *page);
580 int (*readpages)(struct file *filp, struct address_space *mapping,
581 struct list_head *pages, unsigned nr_pages);
583 int (*write_begin)(struct file *, struct address_space *mapping,
584 loff_t pos, unsigned len, unsigned flags,
585 struct page **pagep, void **fsdata);
586 int (*write_end)(struct file *, struct address_space *mapping,
587 loff_t pos, unsigned len, unsigned copied,
588 struct page *page, void *fsdata);
590 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
591 sector_t (*bmap)(struct address_space *, sector_t);
592 void (*invalidatepage) (struct page *, unsigned long);
593 int (*releasepage) (struct page *, gfp_t);
594 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
595 loff_t offset, unsigned long nr_segs);
596 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
597 void **, unsigned long *);
598 /* migrate the contents of a page to the specified target */
599 int (*migratepage) (struct address_space *,
600 struct page *, struct page *);
601 int (*launder_page) (struct page *);
602 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
603 unsigned long);
604 int (*error_remove_page)(struct address_space *, struct page *);
608 * pagecache_write_begin/pagecache_write_end must be used by general code
609 * to write into the pagecache.
611 int pagecache_write_begin(struct file *, struct address_space *mapping,
612 loff_t pos, unsigned len, unsigned flags,
613 struct page **pagep, void **fsdata);
615 int pagecache_write_end(struct file *, struct address_space *mapping,
616 loff_t pos, unsigned len, unsigned copied,
617 struct page *page, void *fsdata);
619 struct backing_dev_info;
620 struct address_space {
621 struct inode *host; /* owner: inode, block_device */
622 struct radix_tree_root page_tree; /* radix tree of all pages */
623 spinlock_t tree_lock; /* and lock protecting it */
624 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
625 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
626 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
627 spinlock_t i_mmap_lock; /* protect tree, count, list */
628 unsigned int truncate_count; /* Cover race condition with truncate */
629 unsigned long nrpages; /* number of total pages */
630 pgoff_t writeback_index;/* writeback starts here */
631 const struct address_space_operations *a_ops; /* methods */
632 unsigned long flags; /* error bits/gfp mask */
633 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
634 spinlock_t private_lock; /* for use by the address_space */
635 struct list_head private_list; /* ditto */
636 struct address_space *assoc_mapping; /* ditto */
637 } __attribute__((aligned(sizeof(long))));
639 * On most architectures that alignment is already the case; but
640 * must be enforced here for CRIS, to let the least signficant bit
641 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
644 struct block_device {
645 dev_t bd_dev; /* not a kdev_t - it's a search key */
646 struct inode * bd_inode; /* will die */
647 struct super_block * bd_super;
648 int bd_openers;
649 struct mutex bd_mutex; /* open/close mutex */
650 struct list_head bd_inodes;
651 void * bd_holder;
652 int bd_holders;
653 #ifdef CONFIG_SYSFS
654 struct list_head bd_holder_list;
655 #endif
656 struct block_device * bd_contains;
657 unsigned bd_block_size;
658 struct hd_struct * bd_part;
659 /* number of times partitions within this device have been opened. */
660 unsigned bd_part_count;
661 int bd_invalidated;
662 struct gendisk * bd_disk;
663 struct list_head bd_list;
665 * Private data. You must have bd_claim'ed the block_device
666 * to use this. NOTE: bd_claim allows an owner to claim
667 * the same device multiple times, the owner must take special
668 * care to not mess up bd_private for that case.
670 unsigned long bd_private;
672 /* The counter of freeze processes */
673 int bd_fsfreeze_count;
674 /* Mutex for freeze */
675 struct mutex bd_fsfreeze_mutex;
679 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
680 * radix trees
682 #define PAGECACHE_TAG_DIRTY 0
683 #define PAGECACHE_TAG_WRITEBACK 1
685 int mapping_tagged(struct address_space *mapping, int tag);
688 * Might pages of this file be mapped into userspace?
690 static inline int mapping_mapped(struct address_space *mapping)
692 return !prio_tree_empty(&mapping->i_mmap) ||
693 !list_empty(&mapping->i_mmap_nonlinear);
697 * Might pages of this file have been modified in userspace?
698 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
699 * marks vma as VM_SHARED if it is shared, and the file was opened for
700 * writing i.e. vma may be mprotected writable even if now readonly.
702 static inline int mapping_writably_mapped(struct address_space *mapping)
704 return mapping->i_mmap_writable != 0;
708 * Use sequence counter to get consistent i_size on 32-bit processors.
710 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
711 #include <linux/seqlock.h>
712 #define __NEED_I_SIZE_ORDERED
713 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
714 #else
715 #define i_size_ordered_init(inode) do { } while (0)
716 #endif
718 struct posix_acl;
719 #define ACL_NOT_CACHED ((void *)(-1))
721 struct inode {
722 struct hlist_node i_hash;
723 struct list_head i_list; /* backing dev IO list */
724 struct list_head i_sb_list;
725 struct list_head i_dentry;
726 unsigned long i_ino;
727 atomic_t i_count;
728 unsigned int i_nlink;
729 uid_t i_uid;
730 gid_t i_gid;
731 dev_t i_rdev;
732 u64 i_version;
733 loff_t i_size;
734 #ifdef __NEED_I_SIZE_ORDERED
735 seqcount_t i_size_seqcount;
736 #endif
737 struct timespec i_atime;
738 struct timespec i_mtime;
739 struct timespec i_ctime;
740 blkcnt_t i_blocks;
741 unsigned int i_blkbits;
742 unsigned short i_bytes;
743 umode_t i_mode;
744 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
745 struct mutex i_mutex;
746 struct rw_semaphore i_alloc_sem;
747 const struct inode_operations *i_op;
748 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
749 struct super_block *i_sb;
750 struct file_lock *i_flock;
751 struct address_space *i_mapping;
752 struct address_space i_data;
753 #ifdef CONFIG_QUOTA
754 struct dquot *i_dquot[MAXQUOTAS];
755 #endif
756 struct list_head i_devices;
757 union {
758 struct pipe_inode_info *i_pipe;
759 struct block_device *i_bdev;
760 struct cdev *i_cdev;
763 __u32 i_generation;
765 #ifdef CONFIG_FSNOTIFY
766 __u32 i_fsnotify_mask; /* all events this inode cares about */
767 struct hlist_head i_fsnotify_mark_entries; /* fsnotify mark entries */
768 #endif
770 #ifdef CONFIG_INOTIFY
771 struct list_head inotify_watches; /* watches on this inode */
772 struct mutex inotify_mutex; /* protects the watches list */
773 #endif
775 unsigned long i_state;
776 unsigned long dirtied_when; /* jiffies of first dirtying */
778 unsigned int i_flags;
780 atomic_t i_writecount;
781 #ifdef CONFIG_SECURITY
782 void *i_security;
783 #endif
784 #ifdef CONFIG_FS_POSIX_ACL
785 struct posix_acl *i_acl;
786 struct posix_acl *i_default_acl;
787 #endif
788 void *i_private; /* fs or device private pointer */
792 * inode->i_mutex nesting subclasses for the lock validator:
794 * 0: the object of the current VFS operation
795 * 1: parent
796 * 2: child/target
797 * 3: quota file
799 * The locking order between these classes is
800 * parent -> child -> normal -> xattr -> quota
802 enum inode_i_mutex_lock_class
804 I_MUTEX_NORMAL,
805 I_MUTEX_PARENT,
806 I_MUTEX_CHILD,
807 I_MUTEX_XATTR,
808 I_MUTEX_QUOTA
812 * NOTE: in a 32bit arch with a preemptable kernel and
813 * an UP compile the i_size_read/write must be atomic
814 * with respect to the local cpu (unlike with preempt disabled),
815 * but they don't need to be atomic with respect to other cpus like in
816 * true SMP (so they need either to either locally disable irq around
817 * the read or for example on x86 they can be still implemented as a
818 * cmpxchg8b without the need of the lock prefix). For SMP compiles
819 * and 64bit archs it makes no difference if preempt is enabled or not.
821 static inline loff_t i_size_read(const struct inode *inode)
823 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
824 loff_t i_size;
825 unsigned int seq;
827 do {
828 seq = read_seqcount_begin(&inode->i_size_seqcount);
829 i_size = inode->i_size;
830 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
831 return i_size;
832 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
833 loff_t i_size;
835 preempt_disable();
836 i_size = inode->i_size;
837 preempt_enable();
838 return i_size;
839 #else
840 return inode->i_size;
841 #endif
845 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
846 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
847 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
849 static inline void i_size_write(struct inode *inode, loff_t i_size)
851 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
852 write_seqcount_begin(&inode->i_size_seqcount);
853 inode->i_size = i_size;
854 write_seqcount_end(&inode->i_size_seqcount);
855 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
856 preempt_disable();
857 inode->i_size = i_size;
858 preempt_enable();
859 #else
860 inode->i_size = i_size;
861 #endif
864 static inline unsigned iminor(const struct inode *inode)
866 return MINOR(inode->i_rdev);
869 static inline unsigned imajor(const struct inode *inode)
871 return MAJOR(inode->i_rdev);
874 extern struct block_device *I_BDEV(struct inode *inode);
876 struct fown_struct {
877 rwlock_t lock; /* protects pid, uid, euid fields */
878 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
879 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
880 uid_t uid, euid; /* uid/euid of process setting the owner */
881 int signum; /* posix.1b rt signal to be delivered on IO */
885 * Track a single file's readahead state
887 struct file_ra_state {
888 pgoff_t start; /* where readahead started */
889 unsigned int size; /* # of readahead pages */
890 unsigned int async_size; /* do asynchronous readahead when
891 there are only # of pages ahead */
893 unsigned int ra_pages; /* Maximum readahead window */
894 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
895 loff_t prev_pos; /* Cache last read() position */
899 * Check if @index falls in the readahead windows.
901 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
903 return (index >= ra->start &&
904 index < ra->start + ra->size);
907 #define FILE_MNT_WRITE_TAKEN 1
908 #define FILE_MNT_WRITE_RELEASED 2
910 struct file {
912 * fu_list becomes invalid after file_free is called and queued via
913 * fu_rcuhead for RCU freeing
915 union {
916 struct list_head fu_list;
917 struct rcu_head fu_rcuhead;
918 } f_u;
919 struct path f_path;
920 #define f_dentry f_path.dentry
921 #define f_vfsmnt f_path.mnt
922 const struct file_operations *f_op;
923 spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */
924 atomic_long_t f_count;
925 unsigned int f_flags;
926 fmode_t f_mode;
927 loff_t f_pos;
928 struct fown_struct f_owner;
929 const struct cred *f_cred;
930 struct file_ra_state f_ra;
932 u64 f_version;
933 #ifdef CONFIG_SECURITY
934 void *f_security;
935 #endif
936 /* needed for tty driver, and maybe others */
937 void *private_data;
939 #ifdef CONFIG_EPOLL
940 /* Used by fs/eventpoll.c to link all the hooks to this file */
941 struct list_head f_ep_links;
942 #endif /* #ifdef CONFIG_EPOLL */
943 struct address_space *f_mapping;
944 #ifdef CONFIG_DEBUG_WRITECOUNT
945 unsigned long f_mnt_write_state;
946 #endif
948 extern spinlock_t files_lock;
949 #define file_list_lock() spin_lock(&files_lock);
950 #define file_list_unlock() spin_unlock(&files_lock);
952 #define get_file(x) atomic_long_inc(&(x)->f_count)
953 #define file_count(x) atomic_long_read(&(x)->f_count)
955 #ifdef CONFIG_DEBUG_WRITECOUNT
956 static inline void file_take_write(struct file *f)
958 WARN_ON(f->f_mnt_write_state != 0);
959 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
961 static inline void file_release_write(struct file *f)
963 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
965 static inline void file_reset_write(struct file *f)
967 f->f_mnt_write_state = 0;
969 static inline void file_check_state(struct file *f)
972 * At this point, either both or neither of these bits
973 * should be set.
975 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
976 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
978 static inline int file_check_writeable(struct file *f)
980 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
981 return 0;
982 printk(KERN_WARNING "writeable file with no "
983 "mnt_want_write()\n");
984 WARN_ON(1);
985 return -EINVAL;
987 #else /* !CONFIG_DEBUG_WRITECOUNT */
988 static inline void file_take_write(struct file *filp) {}
989 static inline void file_release_write(struct file *filp) {}
990 static inline void file_reset_write(struct file *filp) {}
991 static inline void file_check_state(struct file *filp) {}
992 static inline int file_check_writeable(struct file *filp)
994 return 0;
996 #endif /* CONFIG_DEBUG_WRITECOUNT */
998 #define MAX_NON_LFS ((1UL<<31) - 1)
1000 /* Page cache limit. The filesystems should put that into their s_maxbytes
1001 limits, otherwise bad things can happen in VM. */
1002 #if BITS_PER_LONG==32
1003 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
1004 #elif BITS_PER_LONG==64
1005 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
1006 #endif
1008 #define FL_POSIX 1
1009 #define FL_FLOCK 2
1010 #define FL_ACCESS 8 /* not trying to lock, just looking */
1011 #define FL_EXISTS 16 /* when unlocking, test for existence */
1012 #define FL_LEASE 32 /* lease held on this file */
1013 #define FL_CLOSE 64 /* unlock on close */
1014 #define FL_SLEEP 128 /* A blocking lock */
1017 * Special return value from posix_lock_file() and vfs_lock_file() for
1018 * asynchronous locking.
1020 #define FILE_LOCK_DEFERRED 1
1023 * The POSIX file lock owner is determined by
1024 * the "struct files_struct" in the thread group
1025 * (or NULL for no owner - BSD locks).
1027 * Lockd stuffs a "host" pointer into this.
1029 typedef struct files_struct *fl_owner_t;
1031 struct file_lock_operations {
1032 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1033 void (*fl_release_private)(struct file_lock *);
1036 struct lock_manager_operations {
1037 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
1038 void (*fl_notify)(struct file_lock *); /* unblock callback */
1039 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
1040 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
1041 void (*fl_release_private)(struct file_lock *);
1042 void (*fl_break)(struct file_lock *);
1043 int (*fl_mylease)(struct file_lock *, struct file_lock *);
1044 int (*fl_change)(struct file_lock **, int);
1047 struct lock_manager {
1048 struct list_head list;
1051 void locks_start_grace(struct lock_manager *);
1052 void locks_end_grace(struct lock_manager *);
1053 int locks_in_grace(void);
1055 /* that will die - we need it for nfs_lock_info */
1056 #include <linux/nfs_fs_i.h>
1058 struct file_lock {
1059 struct file_lock *fl_next; /* singly linked list for this inode */
1060 struct list_head fl_link; /* doubly linked list of all locks */
1061 struct list_head fl_block; /* circular list of blocked processes */
1062 fl_owner_t fl_owner;
1063 unsigned char fl_flags;
1064 unsigned char fl_type;
1065 unsigned int fl_pid;
1066 struct pid *fl_nspid;
1067 wait_queue_head_t fl_wait;
1068 struct file *fl_file;
1069 loff_t fl_start;
1070 loff_t fl_end;
1072 struct fasync_struct * fl_fasync; /* for lease break notifications */
1073 unsigned long fl_break_time; /* for nonblocking lease breaks */
1075 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
1076 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
1077 union {
1078 struct nfs_lock_info nfs_fl;
1079 struct nfs4_lock_info nfs4_fl;
1080 struct {
1081 struct list_head link; /* link in AFS vnode's pending_locks list */
1082 int state; /* state of grant or error if -ve */
1083 } afs;
1084 } fl_u;
1087 /* The following constant reflects the upper bound of the file/locking space */
1088 #ifndef OFFSET_MAX
1089 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1090 #define OFFSET_MAX INT_LIMIT(loff_t)
1091 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1092 #endif
1094 #include <linux/fcntl.h>
1096 extern void send_sigio(struct fown_struct *fown, int fd, int band);
1098 #ifdef CONFIG_FILE_LOCKING
1099 extern int fcntl_getlk(struct file *, struct flock __user *);
1100 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
1101 struct flock __user *);
1103 #if BITS_PER_LONG == 32
1104 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1105 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1106 struct flock64 __user *);
1107 #endif
1109 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1110 extern int fcntl_getlease(struct file *filp);
1112 /* fs/locks.c */
1113 extern void locks_init_lock(struct file_lock *);
1114 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1115 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1116 extern void locks_remove_posix(struct file *, fl_owner_t);
1117 extern void locks_remove_flock(struct file *);
1118 extern void locks_release_private(struct file_lock *);
1119 extern void posix_test_lock(struct file *, struct file_lock *);
1120 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1121 extern int posix_lock_file_wait(struct file *, struct file_lock *);
1122 extern int posix_unblock_lock(struct file *, struct file_lock *);
1123 extern int vfs_test_lock(struct file *, struct file_lock *);
1124 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
1125 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1126 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1127 extern int __break_lease(struct inode *inode, unsigned int flags);
1128 extern void lease_get_mtime(struct inode *, struct timespec *time);
1129 extern int generic_setlease(struct file *, long, struct file_lock **);
1130 extern int vfs_setlease(struct file *, long, struct file_lock **);
1131 extern int lease_modify(struct file_lock **, int);
1132 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1133 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1134 #else /* !CONFIG_FILE_LOCKING */
1135 static inline int fcntl_getlk(struct file *file, struct flock __user *user)
1137 return -EINVAL;
1140 static inline int fcntl_setlk(unsigned int fd, struct file *file,
1141 unsigned int cmd, struct flock __user *user)
1143 return -EACCES;
1146 #if BITS_PER_LONG == 32
1147 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
1149 return -EINVAL;
1152 static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1153 unsigned int cmd, struct flock64 __user *user)
1155 return -EACCES;
1157 #endif
1158 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1160 return 0;
1163 static inline int fcntl_getlease(struct file *filp)
1165 return 0;
1168 static inline void locks_init_lock(struct file_lock *fl)
1170 return;
1173 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1175 return;
1178 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1180 return;
1183 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1185 return;
1188 static inline void locks_remove_flock(struct file *filp)
1190 return;
1193 static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1195 return;
1198 static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1199 struct file_lock *conflock)
1201 return -ENOLCK;
1204 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
1206 return -ENOLCK;
1209 static inline int posix_unblock_lock(struct file *filp,
1210 struct file_lock *waiter)
1212 return -ENOENT;
1215 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1217 return 0;
1220 static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1221 struct file_lock *fl, struct file_lock *conf)
1223 return -ENOLCK;
1226 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1228 return 0;
1231 static inline int flock_lock_file_wait(struct file *filp,
1232 struct file_lock *request)
1234 return -ENOLCK;
1237 static inline int __break_lease(struct inode *inode, unsigned int mode)
1239 return 0;
1242 static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1244 return;
1247 static inline int generic_setlease(struct file *filp, long arg,
1248 struct file_lock **flp)
1250 return -EINVAL;
1253 static inline int vfs_setlease(struct file *filp, long arg,
1254 struct file_lock **lease)
1256 return -EINVAL;
1259 static inline int lease_modify(struct file_lock **before, int arg)
1261 return -EINVAL;
1264 static inline int lock_may_read(struct inode *inode, loff_t start,
1265 unsigned long len)
1267 return 1;
1270 static inline int lock_may_write(struct inode *inode, loff_t start,
1271 unsigned long len)
1273 return 1;
1276 #endif /* !CONFIG_FILE_LOCKING */
1279 struct fasync_struct {
1280 int magic;
1281 int fa_fd;
1282 struct fasync_struct *fa_next; /* singly linked list */
1283 struct file *fa_file;
1286 #define FASYNC_MAGIC 0x4601
1288 /* SMP safe fasync helpers: */
1289 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1290 /* can be called from interrupts */
1291 extern void kill_fasync(struct fasync_struct **, int, int);
1292 /* only for net: no internal synchronization */
1293 extern void __kill_fasync(struct fasync_struct *, int, int);
1295 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1296 extern int f_setown(struct file *filp, unsigned long arg, int force);
1297 extern void f_delown(struct file *filp);
1298 extern pid_t f_getown(struct file *filp);
1299 extern int send_sigurg(struct fown_struct *fown);
1302 * Umount options
1305 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1306 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1307 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1309 extern struct list_head super_blocks;
1310 extern spinlock_t sb_lock;
1312 #define sb_entry(list) list_entry((list), struct super_block, s_list)
1313 #define S_BIAS (1<<30)
1314 struct super_block {
1315 struct list_head s_list; /* Keep this first */
1316 dev_t s_dev; /* search index; _not_ kdev_t */
1317 unsigned long s_blocksize;
1318 unsigned char s_blocksize_bits;
1319 unsigned char s_dirt;
1320 loff_t s_maxbytes; /* Max file size */
1321 struct file_system_type *s_type;
1322 const struct super_operations *s_op;
1323 const struct dquot_operations *dq_op;
1324 const struct quotactl_ops *s_qcop;
1325 const struct export_operations *s_export_op;
1326 unsigned long s_flags;
1327 unsigned long s_magic;
1328 struct dentry *s_root;
1329 struct rw_semaphore s_umount;
1330 struct mutex s_lock;
1331 int s_count;
1332 int s_need_sync;
1333 atomic_t s_active;
1334 #ifdef CONFIG_SECURITY
1335 void *s_security;
1336 #endif
1337 struct xattr_handler **s_xattr;
1339 struct list_head s_inodes; /* all inodes */
1340 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1341 struct list_head s_files;
1342 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1343 struct list_head s_dentry_lru; /* unused dentry lru */
1344 int s_nr_dentry_unused; /* # of dentry on lru */
1346 struct block_device *s_bdev;
1347 struct backing_dev_info *s_bdi;
1348 struct mtd_info *s_mtd;
1349 struct list_head s_instances;
1350 struct quota_info s_dquot; /* Diskquota specific options */
1352 int s_frozen;
1353 wait_queue_head_t s_wait_unfrozen;
1355 char s_id[32]; /* Informational name */
1357 void *s_fs_info; /* Filesystem private info */
1358 fmode_t s_mode;
1361 * The next field is for VFS *only*. No filesystems have any business
1362 * even looking at it. You had been warned.
1364 struct mutex s_vfs_rename_mutex; /* Kludge */
1366 /* Granularity of c/m/atime in ns.
1367 Cannot be worse than a second */
1368 u32 s_time_gran;
1371 * Filesystem subtype. If non-empty the filesystem type field
1372 * in /proc/mounts will be "type.subtype"
1374 char *s_subtype;
1377 * Saved mount options for lazy filesystems using
1378 * generic_show_options()
1380 char *s_options;
1383 extern struct timespec current_fs_time(struct super_block *sb);
1386 * Snapshotting support.
1388 enum {
1389 SB_UNFROZEN = 0,
1390 SB_FREEZE_WRITE = 1,
1391 SB_FREEZE_TRANS = 2,
1394 #define vfs_check_frozen(sb, level) \
1395 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1397 #define get_fs_excl() atomic_inc(&current->fs_excl)
1398 #define put_fs_excl() atomic_dec(&current->fs_excl)
1399 #define has_fs_excl() atomic_read(&current->fs_excl)
1401 #define is_owner_or_cap(inode) \
1402 ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
1404 /* not quite ready to be deprecated, but... */
1405 extern void lock_super(struct super_block *);
1406 extern void unlock_super(struct super_block *);
1409 * VFS helper functions..
1411 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1412 extern int vfs_mkdir(struct inode *, struct dentry *, int);
1413 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
1414 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
1415 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1416 extern int vfs_rmdir(struct inode *, struct dentry *);
1417 extern int vfs_unlink(struct inode *, struct dentry *);
1418 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1421 * VFS dentry helper functions.
1423 extern void dentry_unhash(struct dentry *dentry);
1426 * VFS file helper functions.
1428 extern int file_permission(struct file *, int);
1431 * VFS FS_IOC_FIEMAP helper definitions.
1433 struct fiemap_extent_info {
1434 unsigned int fi_flags; /* Flags as passed from user */
1435 unsigned int fi_extents_mapped; /* Number of mapped extents */
1436 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1437 struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
1438 * array */
1440 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1441 u64 phys, u64 len, u32 flags);
1442 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1445 * File types
1447 * NOTE! These match bits 12..15 of stat.st_mode
1448 * (ie "(i_mode >> 12) & 15").
1450 #define DT_UNKNOWN 0
1451 #define DT_FIFO 1
1452 #define DT_CHR 2
1453 #define DT_DIR 4
1454 #define DT_BLK 6
1455 #define DT_REG 8
1456 #define DT_LNK 10
1457 #define DT_SOCK 12
1458 #define DT_WHT 14
1461 * This is the "filldir" function type, used by readdir() to let
1462 * the kernel specify what kind of dirent layout it wants to have.
1463 * This allows the kernel to read directories into kernel space or
1464 * to have different dirent layouts depending on the binary type.
1466 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1467 struct block_device_operations;
1469 /* These macros are for out of kernel modules to test that
1470 * the kernel supports the unlocked_ioctl and compat_ioctl
1471 * fields in struct file_operations. */
1472 #define HAVE_COMPAT_IOCTL 1
1473 #define HAVE_UNLOCKED_IOCTL 1
1476 * NOTE:
1477 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1478 * can be called without the big kernel lock held in all filesystems.
1480 struct file_operations {
1481 struct module *owner;
1482 loff_t (*llseek) (struct file *, loff_t, int);
1483 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1484 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1485 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1486 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1487 int (*readdir) (struct file *, void *, filldir_t);
1488 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1489 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1490 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1491 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1492 int (*mmap) (struct file *, struct vm_area_struct *);
1493 int (*open) (struct inode *, struct file *);
1494 int (*flush) (struct file *, fl_owner_t id);
1495 int (*release) (struct inode *, struct file *);
1496 int (*fsync) (struct file *, struct dentry *, int datasync);
1497 int (*aio_fsync) (struct kiocb *, int datasync);
1498 int (*fasync) (int, struct file *, int);
1499 int (*lock) (struct file *, int, struct file_lock *);
1500 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1501 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1502 int (*check_flags)(int);
1503 int (*flock) (struct file *, int, struct file_lock *);
1504 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1505 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1506 int (*setlease)(struct file *, long, struct file_lock **);
1509 struct inode_operations {
1510 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1511 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1512 int (*link) (struct dentry *,struct inode *,struct dentry *);
1513 int (*unlink) (struct inode *,struct dentry *);
1514 int (*symlink) (struct inode *,struct dentry *,const char *);
1515 int (*mkdir) (struct inode *,struct dentry *,int);
1516 int (*rmdir) (struct inode *,struct dentry *);
1517 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1518 int (*rename) (struct inode *, struct dentry *,
1519 struct inode *, struct dentry *);
1520 int (*readlink) (struct dentry *, char __user *,int);
1521 void * (*follow_link) (struct dentry *, struct nameidata *);
1522 void (*put_link) (struct dentry *, struct nameidata *, void *);
1523 void (*truncate) (struct inode *);
1524 int (*permission) (struct inode *, int);
1525 int (*check_acl)(struct inode *, int);
1526 int (*setattr) (struct dentry *, struct iattr *);
1527 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1528 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1529 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1530 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1531 int (*removexattr) (struct dentry *, const char *);
1532 void (*truncate_range)(struct inode *, loff_t, loff_t);
1533 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1534 loff_t len);
1535 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1536 u64 len);
1539 struct seq_file;
1541 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1542 unsigned long nr_segs, unsigned long fast_segs,
1543 struct iovec *fast_pointer,
1544 struct iovec **ret_pointer);
1546 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1547 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1548 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1549 unsigned long, loff_t *);
1550 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1551 unsigned long, loff_t *);
1553 struct super_operations {
1554 struct inode *(*alloc_inode)(struct super_block *sb);
1555 void (*destroy_inode)(struct inode *);
1557 void (*dirty_inode) (struct inode *);
1558 int (*write_inode) (struct inode *, int);
1559 void (*drop_inode) (struct inode *);
1560 void (*delete_inode) (struct inode *);
1561 void (*put_super) (struct super_block *);
1562 void (*write_super) (struct super_block *);
1563 int (*sync_fs)(struct super_block *sb, int wait);
1564 int (*freeze_fs) (struct super_block *);
1565 int (*unfreeze_fs) (struct super_block *);
1566 int (*statfs) (struct dentry *, struct kstatfs *);
1567 int (*remount_fs) (struct super_block *, int *, char *);
1568 void (*clear_inode) (struct inode *);
1569 void (*umount_begin) (struct super_block *);
1571 int (*show_options)(struct seq_file *, struct vfsmount *);
1572 int (*show_stats)(struct seq_file *, struct vfsmount *);
1573 #ifdef CONFIG_QUOTA
1574 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1575 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1576 #endif
1577 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1581 * Inode state bits. Protected by inode_lock.
1583 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1584 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1586 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1587 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1588 * various stages of removing an inode.
1590 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1592 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1593 * fdatasync(). i_atime is the usual cause.
1594 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1595 * these changes separately from I_DIRTY_SYNC so that we
1596 * don't have to write inode on fdatasync() when only
1597 * mtime has changed in it.
1598 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1599 * I_NEW Serves as both a mutex and completion notification.
1600 * New inodes set I_NEW. If two processes both create
1601 * the same inode, one of them will release its inode and
1602 * wait for I_NEW to be released before returning.
1603 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1604 * also cause waiting on I_NEW, without I_NEW actually
1605 * being set. find_inode() uses this to prevent returning
1606 * nearly-dead inodes.
1607 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1608 * is zero. I_FREEING must be set when I_WILL_FREE is
1609 * cleared.
1610 * I_FREEING Set when inode is about to be freed but still has dirty
1611 * pages or buffers attached or the inode itself is still
1612 * dirty.
1613 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1614 * and can be destroyed.
1616 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1617 * prohibited for many purposes. iget() must wait for
1618 * the inode to be completely released, then create it
1619 * anew. Other functions will just ignore such inodes,
1620 * if appropriate. I_NEW is used for waiting.
1622 * I_SYNC Synchonized write of dirty inode data. The bits is
1623 * set during data writeback, and cleared with a wakeup
1624 * on the bit address once it is done.
1626 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1628 #define I_DIRTY_SYNC 1
1629 #define I_DIRTY_DATASYNC 2
1630 #define I_DIRTY_PAGES 4
1631 #define __I_NEW 3
1632 #define I_NEW (1 << __I_NEW)
1633 #define I_WILL_FREE 16
1634 #define I_FREEING 32
1635 #define I_CLEAR 64
1636 #define __I_SYNC 7
1637 #define I_SYNC (1 << __I_SYNC)
1639 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1641 extern void __mark_inode_dirty(struct inode *, int);
1642 static inline void mark_inode_dirty(struct inode *inode)
1644 __mark_inode_dirty(inode, I_DIRTY);
1647 static inline void mark_inode_dirty_sync(struct inode *inode)
1649 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1653 * inc_nlink - directly increment an inode's link count
1654 * @inode: inode
1656 * This is a low-level filesystem helper to replace any
1657 * direct filesystem manipulation of i_nlink. Currently,
1658 * it is only here for parity with dec_nlink().
1660 static inline void inc_nlink(struct inode *inode)
1662 inode->i_nlink++;
1665 static inline void inode_inc_link_count(struct inode *inode)
1667 inc_nlink(inode);
1668 mark_inode_dirty(inode);
1672 * drop_nlink - directly drop an inode's link count
1673 * @inode: inode
1675 * This is a low-level filesystem helper to replace any
1676 * direct filesystem manipulation of i_nlink. In cases
1677 * where we are attempting to track writes to the
1678 * filesystem, a decrement to zero means an imminent
1679 * write when the file is truncated and actually unlinked
1680 * on the filesystem.
1682 static inline void drop_nlink(struct inode *inode)
1684 inode->i_nlink--;
1688 * clear_nlink - directly zero an inode's link count
1689 * @inode: inode
1691 * This is a low-level filesystem helper to replace any
1692 * direct filesystem manipulation of i_nlink. See
1693 * drop_nlink() for why we care about i_nlink hitting zero.
1695 static inline void clear_nlink(struct inode *inode)
1697 inode->i_nlink = 0;
1700 static inline void inode_dec_link_count(struct inode *inode)
1702 drop_nlink(inode);
1703 mark_inode_dirty(inode);
1707 * inode_inc_iversion - increments i_version
1708 * @inode: inode that need to be updated
1710 * Every time the inode is modified, the i_version field will be incremented.
1711 * The filesystem has to be mounted with i_version flag
1714 static inline void inode_inc_iversion(struct inode *inode)
1716 spin_lock(&inode->i_lock);
1717 inode->i_version++;
1718 spin_unlock(&inode->i_lock);
1721 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1722 static inline void file_accessed(struct file *file)
1724 if (!(file->f_flags & O_NOATIME))
1725 touch_atime(file->f_path.mnt, file->f_path.dentry);
1728 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1730 struct file_system_type {
1731 const char *name;
1732 int fs_flags;
1733 int (*get_sb) (struct file_system_type *, int,
1734 const char *, void *, struct vfsmount *);
1735 void (*kill_sb) (struct super_block *);
1736 struct module *owner;
1737 struct file_system_type * next;
1738 struct list_head fs_supers;
1740 struct lock_class_key s_lock_key;
1741 struct lock_class_key s_umount_key;
1743 struct lock_class_key i_lock_key;
1744 struct lock_class_key i_mutex_key;
1745 struct lock_class_key i_mutex_dir_key;
1746 struct lock_class_key i_alloc_sem_key;
1749 extern int get_sb_ns(struct file_system_type *fs_type, int flags, void *data,
1750 int (*fill_super)(struct super_block *, void *, int),
1751 struct vfsmount *mnt);
1752 extern int get_sb_bdev(struct file_system_type *fs_type,
1753 int flags, const char *dev_name, void *data,
1754 int (*fill_super)(struct super_block *, void *, int),
1755 struct vfsmount *mnt);
1756 extern int get_sb_single(struct file_system_type *fs_type,
1757 int flags, void *data,
1758 int (*fill_super)(struct super_block *, void *, int),
1759 struct vfsmount *mnt);
1760 extern int get_sb_nodev(struct file_system_type *fs_type,
1761 int flags, void *data,
1762 int (*fill_super)(struct super_block *, void *, int),
1763 struct vfsmount *mnt);
1764 void generic_shutdown_super(struct super_block *sb);
1765 void kill_block_super(struct super_block *sb);
1766 void kill_anon_super(struct super_block *sb);
1767 void kill_litter_super(struct super_block *sb);
1768 void deactivate_super(struct super_block *sb);
1769 void deactivate_locked_super(struct super_block *sb);
1770 int set_anon_super(struct super_block *s, void *data);
1771 struct super_block *sget(struct file_system_type *type,
1772 int (*test)(struct super_block *,void *),
1773 int (*set)(struct super_block *,void *),
1774 void *data);
1775 extern int get_sb_pseudo(struct file_system_type *, char *,
1776 const struct super_operations *ops, unsigned long,
1777 struct vfsmount *mnt);
1778 extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1779 int __put_super_and_need_restart(struct super_block *sb);
1780 void put_super(struct super_block *sb);
1782 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1783 #define fops_get(fops) \
1784 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1785 #define fops_put(fops) \
1786 do { if (fops) module_put((fops)->owner); } while(0)
1788 extern int register_filesystem(struct file_system_type *);
1789 extern int unregister_filesystem(struct file_system_type *);
1790 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1791 #define kern_mount(type) kern_mount_data(type, NULL)
1792 extern int may_umount_tree(struct vfsmount *);
1793 extern int may_umount(struct vfsmount *);
1794 extern long do_mount(char *, char *, char *, unsigned long, void *);
1795 extern struct vfsmount *collect_mounts(struct path *);
1796 extern void drop_collected_mounts(struct vfsmount *);
1798 extern int vfs_statfs(struct dentry *, struct kstatfs *);
1800 extern int current_umask(void);
1802 /* /sys/fs */
1803 extern struct kobject *fs_kobj;
1805 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1807 #define FLOCK_VERIFY_READ 1
1808 #define FLOCK_VERIFY_WRITE 2
1810 #ifdef CONFIG_FILE_LOCKING
1811 extern int locks_mandatory_locked(struct inode *);
1812 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1815 * Candidates for mandatory locking have the setgid bit set
1816 * but no group execute bit - an otherwise meaningless combination.
1819 static inline int __mandatory_lock(struct inode *ino)
1821 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1825 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1826 * otherwise these will be advisory locks
1829 static inline int mandatory_lock(struct inode *ino)
1831 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1834 static inline int locks_verify_locked(struct inode *inode)
1836 if (mandatory_lock(inode))
1837 return locks_mandatory_locked(inode);
1838 return 0;
1841 static inline int locks_verify_truncate(struct inode *inode,
1842 struct file *filp,
1843 loff_t size)
1845 if (inode->i_flock && mandatory_lock(inode))
1846 return locks_mandatory_area(
1847 FLOCK_VERIFY_WRITE, inode, filp,
1848 size < inode->i_size ? size : inode->i_size,
1849 (size < inode->i_size ? inode->i_size - size
1850 : size - inode->i_size)
1852 return 0;
1855 static inline int break_lease(struct inode *inode, unsigned int mode)
1857 if (inode->i_flock)
1858 return __break_lease(inode, mode);
1859 return 0;
1861 #else /* !CONFIG_FILE_LOCKING */
1862 static inline int locks_mandatory_locked(struct inode *inode)
1864 return 0;
1867 static inline int locks_mandatory_area(int rw, struct inode *inode,
1868 struct file *filp, loff_t offset,
1869 size_t count)
1871 return 0;
1874 static inline int __mandatory_lock(struct inode *inode)
1876 return 0;
1879 static inline int mandatory_lock(struct inode *inode)
1881 return 0;
1884 static inline int locks_verify_locked(struct inode *inode)
1886 return 0;
1889 static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
1890 size_t size)
1892 return 0;
1895 static inline int break_lease(struct inode *inode, unsigned int mode)
1897 return 0;
1900 #endif /* CONFIG_FILE_LOCKING */
1902 /* fs/open.c */
1904 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1905 struct file *filp);
1906 extern int do_fallocate(struct file *file, int mode, loff_t offset,
1907 loff_t len);
1908 extern long do_sys_open(int dfd, const char __user *filename, int flags,
1909 int mode);
1910 extern struct file *filp_open(const char *, int, int);
1911 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
1912 const struct cred *);
1913 extern int filp_close(struct file *, fl_owner_t id);
1914 extern char * getname(const char __user *);
1916 /* fs/ioctl.c */
1918 extern int ioctl_preallocate(struct file *filp, void __user *argp);
1920 /* fs/dcache.c */
1921 extern void __init vfs_caches_init_early(void);
1922 extern void __init vfs_caches_init(unsigned long);
1924 extern struct kmem_cache *names_cachep;
1926 #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
1927 #define __getname() __getname_gfp(GFP_KERNEL)
1928 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1929 #ifndef CONFIG_AUDITSYSCALL
1930 #define putname(name) __putname(name)
1931 #else
1932 extern void putname(const char *name);
1933 #endif
1935 #ifdef CONFIG_BLOCK
1936 extern int register_blkdev(unsigned int, const char *);
1937 extern void unregister_blkdev(unsigned int, const char *);
1938 extern struct block_device *bdget(dev_t);
1939 extern struct block_device *bdgrab(struct block_device *bdev);
1940 extern void bd_set_size(struct block_device *, loff_t size);
1941 extern void bd_forget(struct inode *inode);
1942 extern void bdput(struct block_device *);
1943 extern struct block_device *open_by_devnum(dev_t, fmode_t);
1944 extern void invalidate_bdev(struct block_device *);
1945 extern int sync_blockdev(struct block_device *bdev);
1946 extern struct super_block *freeze_bdev(struct block_device *);
1947 extern void emergency_thaw_all(void);
1948 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
1949 extern int fsync_bdev(struct block_device *);
1950 #else
1951 static inline void bd_forget(struct inode *inode) {}
1952 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
1953 static inline void invalidate_bdev(struct block_device *bdev) {}
1955 static inline struct super_block *freeze_bdev(struct block_device *sb)
1957 return NULL;
1960 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
1962 return 0;
1964 #endif
1965 extern int sync_filesystem(struct super_block *);
1966 extern const struct file_operations def_blk_fops;
1967 extern const struct file_operations def_chr_fops;
1968 extern const struct file_operations bad_sock_fops;
1969 extern const struct file_operations def_fifo_fops;
1970 #ifdef CONFIG_BLOCK
1971 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1972 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
1973 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1974 extern int blkdev_get(struct block_device *, fmode_t);
1975 extern int blkdev_put(struct block_device *, fmode_t);
1976 extern int bd_claim(struct block_device *, void *);
1977 extern void bd_release(struct block_device *);
1978 #ifdef CONFIG_SYSFS
1979 extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1980 extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1981 #else
1982 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1983 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1984 #endif
1985 #endif
1987 /* fs/char_dev.c */
1988 #define CHRDEV_MAJOR_HASH_SIZE 255
1989 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1990 extern int register_chrdev_region(dev_t, unsigned, const char *);
1991 extern int __register_chrdev(unsigned int major, unsigned int baseminor,
1992 unsigned int count, const char *name,
1993 const struct file_operations *fops);
1994 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
1995 unsigned int count, const char *name);
1996 extern void unregister_chrdev_region(dev_t, unsigned);
1997 extern void chrdev_show(struct seq_file *,off_t);
1999 static inline int register_chrdev(unsigned int major, const char *name,
2000 const struct file_operations *fops)
2002 return __register_chrdev(major, 0, 256, name, fops);
2005 static inline void unregister_chrdev(unsigned int major, const char *name)
2007 __unregister_chrdev(major, 0, 256, name);
2010 /* fs/block_dev.c */
2011 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2012 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2014 #ifdef CONFIG_BLOCK
2015 #define BLKDEV_MAJOR_HASH_SIZE 255
2016 extern const char *__bdevname(dev_t, char *buffer);
2017 extern const char *bdevname(struct block_device *bdev, char *buffer);
2018 extern struct block_device *lookup_bdev(const char *);
2019 extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
2020 extern void close_bdev_exclusive(struct block_device *, fmode_t);
2021 extern void blkdev_show(struct seq_file *,off_t);
2023 #else
2024 #define BLKDEV_MAJOR_HASH_SIZE 0
2025 #endif
2027 extern void init_special_inode(struct inode *, umode_t, dev_t);
2029 /* Invalid inode operations -- fs/bad_inode.c */
2030 extern void make_bad_inode(struct inode *);
2031 extern int is_bad_inode(struct inode *);
2033 extern const struct file_operations read_pipefifo_fops;
2034 extern const struct file_operations write_pipefifo_fops;
2035 extern const struct file_operations rdwr_pipefifo_fops;
2037 extern int fs_may_remount_ro(struct super_block *);
2039 #ifdef CONFIG_BLOCK
2041 * return READ, READA, or WRITE
2043 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2046 * return data direction, READ or WRITE
2048 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2050 extern void check_disk_size_change(struct gendisk *disk,
2051 struct block_device *bdev);
2052 extern int revalidate_disk(struct gendisk *);
2053 extern int check_disk_change(struct block_device *);
2054 extern int __invalidate_device(struct block_device *);
2055 extern int invalidate_partition(struct gendisk *, int);
2056 #endif
2057 extern int invalidate_inodes(struct super_block *);
2058 unsigned long invalidate_mapping_pages(struct address_space *mapping,
2059 pgoff_t start, pgoff_t end);
2061 static inline unsigned long __deprecated
2062 invalidate_inode_pages(struct address_space *mapping)
2064 return invalidate_mapping_pages(mapping, 0, ~0UL);
2067 static inline void invalidate_remote_inode(struct inode *inode)
2069 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2070 S_ISLNK(inode->i_mode))
2071 invalidate_mapping_pages(inode->i_mapping, 0, -1);
2073 extern int invalidate_inode_pages2(struct address_space *mapping);
2074 extern int invalidate_inode_pages2_range(struct address_space *mapping,
2075 pgoff_t start, pgoff_t end);
2076 extern int write_inode_now(struct inode *, int);
2077 extern int filemap_fdatawrite(struct address_space *);
2078 extern int filemap_flush(struct address_space *);
2079 extern int filemap_fdatawait(struct address_space *);
2080 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
2081 loff_t lend);
2082 extern int filemap_write_and_wait(struct address_space *mapping);
2083 extern int filemap_write_and_wait_range(struct address_space *mapping,
2084 loff_t lstart, loff_t lend);
2085 extern int __filemap_fdatawrite_range(struct address_space *mapping,
2086 loff_t start, loff_t end, int sync_mode);
2087 extern int filemap_fdatawrite_range(struct address_space *mapping,
2088 loff_t start, loff_t end);
2090 extern int vfs_fsync_range(struct file *file, struct dentry *dentry,
2091 loff_t start, loff_t end, int datasync);
2092 extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync);
2093 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
2094 extern void sync_supers(void);
2095 extern void emergency_sync(void);
2096 extern void emergency_remount(void);
2097 #ifdef CONFIG_BLOCK
2098 extern sector_t bmap(struct inode *, sector_t);
2099 #endif
2100 extern int notify_change(struct dentry *, struct iattr *);
2101 extern int inode_permission(struct inode *, int);
2102 extern int generic_permission(struct inode *, int,
2103 int (*check_acl)(struct inode *, int));
2105 static inline bool execute_ok(struct inode *inode)
2107 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2110 extern int get_write_access(struct inode *);
2111 extern int deny_write_access(struct file *);
2112 static inline void put_write_access(struct inode * inode)
2114 atomic_dec(&inode->i_writecount);
2116 static inline void allow_write_access(struct file *file)
2118 if (file)
2119 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
2121 extern int do_pipe_flags(int *, int);
2122 extern struct file *create_read_pipe(struct file *f, int flags);
2123 extern struct file *create_write_pipe(int flags);
2124 extern void free_write_pipe(struct file *);
2126 extern struct file *do_filp_open(int dfd, const char *pathname,
2127 int open_flag, int mode, int acc_mode);
2128 extern int may_open(struct path *, int, int);
2130 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
2131 extern struct file * open_exec(const char *);
2133 /* fs/dcache.c -- generic fs support functions */
2134 extern int is_subdir(struct dentry *, struct dentry *);
2135 extern ino_t find_inode_number(struct dentry *, struct qstr *);
2137 #include <linux/err.h>
2139 /* needed for stackable file system support */
2140 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
2142 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
2144 extern int inode_init_always(struct super_block *, struct inode *);
2145 extern void inode_init_once(struct inode *);
2146 extern void inode_add_to_lists(struct super_block *, struct inode *);
2147 extern void iput(struct inode *);
2148 extern struct inode * igrab(struct inode *);
2149 extern ino_t iunique(struct super_block *, ino_t);
2150 extern int inode_needs_sync(struct inode *inode);
2151 extern void generic_delete_inode(struct inode *inode);
2152 extern void generic_drop_inode(struct inode *inode);
2153 extern int generic_detach_inode(struct inode *inode);
2155 extern struct inode *ilookup5_nowait(struct super_block *sb,
2156 unsigned long hashval, int (*test)(struct inode *, void *),
2157 void *data);
2158 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2159 int (*test)(struct inode *, void *), void *data);
2160 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2162 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2163 extern struct inode * iget_locked(struct super_block *, unsigned long);
2164 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2165 extern int insert_inode_locked(struct inode *);
2166 extern void unlock_new_inode(struct inode *);
2168 extern void __iget(struct inode * inode);
2169 extern void iget_failed(struct inode *);
2170 extern void clear_inode(struct inode *);
2171 extern void destroy_inode(struct inode *);
2172 extern void __destroy_inode(struct inode *);
2173 extern struct inode *new_inode(struct super_block *);
2174 extern int should_remove_suid(struct dentry *);
2175 extern int file_remove_suid(struct file *);
2177 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2178 extern void remove_inode_hash(struct inode *);
2179 static inline void insert_inode_hash(struct inode *inode) {
2180 __insert_inode_hash(inode, inode->i_ino);
2183 extern void file_move(struct file *f, struct list_head *list);
2184 extern void file_kill(struct file *f);
2185 #ifdef CONFIG_BLOCK
2186 struct bio;
2187 extern void submit_bio(int, struct bio *);
2188 extern int bdev_read_only(struct block_device *);
2189 #endif
2190 extern int set_blocksize(struct block_device *, int);
2191 extern int sb_set_blocksize(struct super_block *, int);
2192 extern int sb_min_blocksize(struct super_block *, int);
2194 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2195 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2196 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
2197 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2198 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2199 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
2200 loff_t *);
2201 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2202 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
2203 unsigned long *, loff_t, loff_t *, size_t, size_t);
2204 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
2205 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2206 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2207 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2208 extern int generic_segment_checks(const struct iovec *iov,
2209 unsigned long *nr_segs, size_t *count, int access_flags);
2211 /* fs/block_dev.c */
2212 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
2213 unsigned long nr_segs, loff_t pos);
2215 /* fs/splice.c */
2216 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
2217 struct pipe_inode_info *, size_t, unsigned int);
2218 extern ssize_t default_file_splice_read(struct file *, loff_t *,
2219 struct pipe_inode_info *, size_t, unsigned int);
2220 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2221 struct file *, loff_t *, size_t, unsigned int);
2222 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2223 struct file *out, loff_t *, size_t len, unsigned int flags);
2224 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
2225 size_t len, unsigned int flags);
2227 extern void
2228 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2229 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
2230 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
2231 extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
2232 int origin);
2233 extern int generic_file_open(struct inode * inode, struct file * filp);
2234 extern int nonseekable_open(struct inode * inode, struct file * filp);
2236 #ifdef CONFIG_FS_XIP
2237 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
2238 loff_t *ppos);
2239 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2240 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2241 size_t len, loff_t *ppos);
2242 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2243 #else
2244 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2246 return 0;
2248 #endif
2250 #ifdef CONFIG_BLOCK
2251 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2252 struct block_device *bdev, const struct iovec *iov, loff_t offset,
2253 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
2254 int lock_type);
2256 enum {
2257 /* need locking between buffered and direct access */
2258 DIO_LOCKING = 0x01,
2260 /* filesystem does not support filling holes */
2261 DIO_SKIP_HOLES = 0x02,
2264 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2265 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2266 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2267 dio_iodone_t end_io)
2269 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2270 nr_segs, get_block, end_io,
2271 DIO_LOCKING | DIO_SKIP_HOLES);
2274 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
2275 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2276 loff_t offset, unsigned long nr_segs, get_block_t get_block,
2277 dio_iodone_t end_io)
2279 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2280 nr_segs, get_block, end_io, 0);
2282 #endif
2284 extern const struct file_operations generic_ro_fops;
2286 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2288 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2289 extern int vfs_follow_link(struct nameidata *, const char *);
2290 extern int page_readlink(struct dentry *, char __user *, int);
2291 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2292 extern void page_put_link(struct dentry *, struct nameidata *, void *);
2293 extern int __page_symlink(struct inode *inode, const char *symname, int len,
2294 int nofs);
2295 extern int page_symlink(struct inode *inode, const char *symname, int len);
2296 extern const struct inode_operations page_symlink_inode_operations;
2297 extern int generic_readlink(struct dentry *, char __user *, int);
2298 extern void generic_fillattr(struct inode *, struct kstat *);
2299 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2300 void __inode_add_bytes(struct inode *inode, loff_t bytes);
2301 void inode_add_bytes(struct inode *inode, loff_t bytes);
2302 void inode_sub_bytes(struct inode *inode, loff_t bytes);
2303 loff_t inode_get_bytes(struct inode *inode);
2304 void inode_set_bytes(struct inode *inode, loff_t bytes);
2306 extern int vfs_readdir(struct file *, filldir_t, void *);
2308 extern int vfs_stat(char __user *, struct kstat *);
2309 extern int vfs_lstat(char __user *, struct kstat *);
2310 extern int vfs_fstat(unsigned int, struct kstat *);
2311 extern int vfs_fstatat(int , char __user *, struct kstat *, int);
2313 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2314 unsigned long arg);
2315 extern int __generic_block_fiemap(struct inode *inode,
2316 struct fiemap_extent_info *fieinfo, u64 start,
2317 u64 len, get_block_t *get_block);
2318 extern int generic_block_fiemap(struct inode *inode,
2319 struct fiemap_extent_info *fieinfo, u64 start,
2320 u64 len, get_block_t *get_block);
2322 extern void get_filesystem(struct file_system_type *fs);
2323 extern void put_filesystem(struct file_system_type *fs);
2324 extern struct file_system_type *get_fs_type(const char *name);
2325 extern struct super_block *get_super(struct block_device *);
2326 extern struct super_block *get_active_super(struct block_device *bdev);
2327 extern struct super_block *user_get_super(dev_t);
2328 extern void drop_super(struct super_block *sb);
2330 extern int dcache_dir_open(struct inode *, struct file *);
2331 extern int dcache_dir_close(struct inode *, struct file *);
2332 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2333 extern int dcache_readdir(struct file *, void *, filldir_t);
2334 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2335 extern int simple_statfs(struct dentry *, struct kstatfs *);
2336 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2337 extern int simple_unlink(struct inode *, struct dentry *);
2338 extern int simple_rmdir(struct inode *, struct dentry *);
2339 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2340 extern int simple_sync_file(struct file *, struct dentry *, int);
2341 extern int simple_empty(struct dentry *);
2342 extern int simple_readpage(struct file *file, struct page *page);
2343 extern int simple_prepare_write(struct file *file, struct page *page,
2344 unsigned offset, unsigned to);
2345 extern int simple_write_begin(struct file *file, struct address_space *mapping,
2346 loff_t pos, unsigned len, unsigned flags,
2347 struct page **pagep, void **fsdata);
2348 extern int simple_write_end(struct file *file, struct address_space *mapping,
2349 loff_t pos, unsigned len, unsigned copied,
2350 struct page *page, void *fsdata);
2352 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
2353 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2354 extern const struct file_operations simple_dir_operations;
2355 extern const struct inode_operations simple_dir_inode_operations;
2356 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2357 struct dentry *d_alloc_name(struct dentry *, const char *);
2358 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
2359 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
2360 extern void simple_release_fs(struct vfsmount **mount, int *count);
2362 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2363 loff_t *ppos, const void *from, size_t available);
2365 extern int simple_fsync(struct file *, struct dentry *, int);
2367 #ifdef CONFIG_MIGRATION
2368 extern int buffer_migrate_page(struct address_space *,
2369 struct page *, struct page *);
2370 #else
2371 #define buffer_migrate_page NULL
2372 #endif
2374 extern int inode_change_ok(const struct inode *, struct iattr *);
2375 extern int inode_newsize_ok(const struct inode *, loff_t offset);
2376 extern int __must_check inode_setattr(struct inode *, struct iattr *);
2378 extern void file_update_time(struct file *file);
2380 extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2381 extern void save_mount_options(struct super_block *sb, char *options);
2382 extern void replace_mount_options(struct super_block *sb, char *options);
2384 static inline ino_t parent_ino(struct dentry *dentry)
2386 ino_t res;
2388 spin_lock(&dentry->d_lock);
2389 res = dentry->d_parent->d_inode->i_ino;
2390 spin_unlock(&dentry->d_lock);
2391 return res;
2394 /* Transaction based IO helpers */
2397 * An argresp is stored in an allocated page and holds the
2398 * size of the argument or response, along with its content
2400 struct simple_transaction_argresp {
2401 ssize_t size;
2402 char data[0];
2405 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2407 char *simple_transaction_get(struct file *file, const char __user *buf,
2408 size_t size);
2409 ssize_t simple_transaction_read(struct file *file, char __user *buf,
2410 size_t size, loff_t *pos);
2411 int simple_transaction_release(struct inode *inode, struct file *file);
2413 void simple_transaction_set(struct file *file, size_t n);
2416 * simple attribute files
2418 * These attributes behave similar to those in sysfs:
2420 * Writing to an attribute immediately sets a value, an open file can be
2421 * written to multiple times.
2423 * Reading from an attribute creates a buffer from the value that might get
2424 * read with multiple read calls. When the attribute has been read
2425 * completely, no further read calls are possible until the file is opened
2426 * again.
2428 * All attributes contain a text representation of a numeric value
2429 * that are accessed with the get() and set() functions.
2431 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2432 static int __fops ## _open(struct inode *inode, struct file *file) \
2434 __simple_attr_check_format(__fmt, 0ull); \
2435 return simple_attr_open(inode, file, __get, __set, __fmt); \
2437 static const struct file_operations __fops = { \
2438 .owner = THIS_MODULE, \
2439 .open = __fops ## _open, \
2440 .release = simple_attr_release, \
2441 .read = simple_attr_read, \
2442 .write = simple_attr_write, \
2445 static inline void __attribute__((format(printf, 1, 2)))
2446 __simple_attr_check_format(const char *fmt, ...)
2448 /* don't do anything, just let the compiler check the arguments; */
2451 int simple_attr_open(struct inode *inode, struct file *file,
2452 int (*get)(void *, u64 *), int (*set)(void *, u64),
2453 const char *fmt);
2454 int simple_attr_release(struct inode *inode, struct file *file);
2455 ssize_t simple_attr_read(struct file *file, char __user *buf,
2456 size_t len, loff_t *ppos);
2457 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2458 size_t len, loff_t *ppos);
2460 struct ctl_table;
2461 int proc_nr_files(struct ctl_table *table, int write,
2462 void __user *buffer, size_t *lenp, loff_t *ppos);
2464 int __init get_filesystem_list(char *buf);
2466 #define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
2467 #define OPEN_FMODE(flag) ((__force fmode_t)((flag + 1) & O_ACCMODE))
2469 #endif /* __KERNEL__ */
2470 #endif /* _LINUX_FS_H */