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1 | #ifndef _LINUX_FS_H |
2 | #define _LINUX_FS_H |
3 | |
4 | /* |
5 | * This file has definitions for some important file table |
6 | * structures etc. |
7 | */ |
8 | |
9 | #include <linux/limits.h> |
10 | #include <linux/ioctl.h> |
11 | |
12 | /* |
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. |
17 | * |
18 | * Some programs (notably those using select()) may have to be |
19 | * recompiled to take full advantage of the new limits.. |
20 | */ |
21 | |
22 | /* Fixed constants first: */ |
23 | #undef NR_OPEN |
24 | #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ |
25 | |
26 | #define BLOCK_SIZE_BITS 10 |
27 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) |
28 | |
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 |
33 | |
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 */ |
39 | }; |
40 | |
41 | struct inodes_stat_t { |
42 | int nr_inodes; |
43 | int nr_unused; |
44 | int dummy[5]; /* padding for sysctl ABI compatibility */ |
45 | }; |
46 | |
47 | |
48 | #define NR_FILE 8192 /* this can well be larger on a larger system */ |
49 | |
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 |
56 | |
57 | /* |
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() |
60 | */ |
61 | |
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) |
81 | |
82 | /* |
83 | * Don't update ctime and mtime. |
84 | * |
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. |
87 | */ |
88 | #define FMODE_NOCMTIME ((__force fmode_t)2048) |
89 | |
90 | /* Expect random access pattern */ |
91 | #define FMODE_RANDOM ((__force fmode_t)4096) |
92 | |
93 | /* |
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: |
97 | * |
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. |
105 | * |
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. |
112 | * |
113 | * With that in mind, the available types are: |
114 | * |
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. |
145 | * |
146 | */ |
147 | #define RW_MASK 1 |
148 | #define RWA_MASK 2 |
149 | #define READ 0 |
150 | #define WRITE 1 |
151 | #define READA 2 /* read-ahead - don't block if no resources */ |
152 | #define SWRITE 3 /* 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)) |
162 | |
163 | /* |
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. |
166 | */ |
167 | #define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD)) |
168 | #define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER)) |
169 | |
170 | #define SEL_IN 1 |
171 | #define SEL_OUT 2 |
172 | #define SEL_EX 4 |
173 | |
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. |
181 | */ |
182 | |
183 | /* |
184 | * These are the fs-independent mount-flags: up to 32 flags are supported |
185 | */ |
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) |
213 | |
214 | /* |
215 | * Superblock flags that can be altered by MS_REMOUNT |
216 | */ |
217 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) |
218 | |
219 | /* |
220 | * Old magic mount flag and mask |
221 | */ |
222 | #define MS_MGC_VAL 0xC0ED0000 |
223 | #define MS_MGC_MSK 0xffff0000 |
224 | |
225 | /* Inode flags - they have nothing to superblock flags now */ |
226 | |
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 */ |
237 | |
238 | /* |
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. |
243 | * |
244 | * Exception: MS_RDONLY is always applied to the entire file system. |
245 | * |
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 |
250 | */ |
251 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) |
252 | |
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) |
261 | |
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) |
266 | |
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) |
271 | |
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. */ |
274 | |
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 */ |
289 | |
290 | /* Some people are morons. Do not use sizeof! */ |
291 | |
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) |
310 | |
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 */ |
316 | |
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) |
326 | |
327 | /* |
328 | * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) |
329 | */ |
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 */ |
354 | |
355 | #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ |
356 | #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
357 | |
358 | |
359 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
360 | #define SYNC_FILE_RANGE_WRITE 2 |
361 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 |
362 | |
363 | #ifdef __KERNEL__ |
364 | |
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> |
383 | |
384 | #include <asm/atomic.h> |
385 | #include <asm/byteorder.h> |
386 | |
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; |
398 | |
399 | extern void __init inode_init(void); |
400 | extern void __init inode_init_early(void); |
401 | extern void __init files_init(unsigned long); |
402 | |
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 |
411 | |
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); |
417 | |
418 | /* |
419 | * Attribute flags. These should be or-ed together to figure out what |
420 | * has been changed! |
421 | */ |
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) |
439 | |
440 | /* |
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. |
446 | * |
447 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
448 | */ |
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; |
458 | |
459 | /* |
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). |
463 | */ |
464 | struct file *ia_file; |
465 | }; |
466 | |
467 | /* |
468 | * Includes for diskquotas. |
469 | */ |
470 | #include <linux/quota.h> |
471 | |
472 | /** |
473 | * enum positive_aop_returns - aop return codes with specific semantics |
474 | * |
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(); |
483 | * |
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(). |
491 | * |
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. |
496 | */ |
497 | |
498 | enum positive_aop_returns { |
499 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
500 | AOP_TRUNCATED_PAGE = 0x80001, |
501 | }; |
502 | |
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 */ |
508 | |
509 | /* |
510 | * oh the beauties of C type declarations. |
511 | */ |
512 | struct page; |
513 | struct address_space; |
514 | struct writeback_control; |
515 | |
516 | struct iov_iter { |
517 | const struct iovec *iov; |
518 | unsigned long nr_segs; |
519 | size_t iov_offset; |
520 | size_t count; |
521 | }; |
522 | |
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); |
530 | |
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) |
534 | { |
535 | i->iov = iov; |
536 | i->nr_segs = nr_segs; |
537 | i->iov_offset = 0; |
538 | i->count = count + written; |
539 | |
540 | iov_iter_advance(i, written); |
541 | } |
542 | |
543 | static inline size_t iov_iter_count(struct iov_iter *i) |
544 | { |
545 | return i->count; |
546 | } |
547 | |
548 | /* |
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. |
553 | * |
554 | * The simplest case just copies the data to user |
555 | * mode. |
556 | */ |
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; |
566 | |
567 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
568 | unsigned long, unsigned long); |
569 | |
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 *); |
574 | |
575 | /* Write back some dirty pages from this mapping. */ |
576 | int (*writepages)(struct address_space *, struct writeback_control *); |
577 | |
578 | /* Set a page dirty. Return true if this dirtied it */ |
579 | int (*set_page_dirty)(struct page *page); |
580 | |
581 | int (*readpages)(struct file *filp, struct address_space *mapping, |
582 | struct list_head *pages, unsigned nr_pages); |
583 | |
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); |
590 | |
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 *); |
606 | }; |
607 | |
608 | /* |
609 | * pagecache_write_begin/pagecache_write_end must be used by general code |
610 | * to write into the pagecache. |
611 | */ |
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); |
615 | |
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); |
619 | |
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 | } __attribute__((aligned(sizeof(long)))); |
639 | /* |
640 | * On most architectures that alignment is already the case; but |
641 | * must be enforced here for CRIS, to let the least signficant bit |
642 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
643 | */ |
644 | |
645 | struct block_device { |
646 | dev_t bd_dev; /* not a kdev_t - it's a search key */ |
647 | struct inode * bd_inode; /* will die */ |
648 | struct super_block * bd_super; |
649 | int bd_openers; |
650 | struct mutex bd_mutex; /* open/close mutex */ |
651 | struct list_head bd_inodes; |
652 | void * bd_holder; |
653 | int bd_holders; |
654 | #ifdef CONFIG_SYSFS |
655 | struct list_head bd_holder_list; |
656 | #endif |
657 | struct block_device * bd_contains; |
658 | unsigned bd_block_size; |
659 | struct hd_struct * bd_part; |
660 | /* number of times partitions within this device have been opened. */ |
661 | unsigned bd_part_count; |
662 | int bd_invalidated; |
663 | struct gendisk * bd_disk; |
664 | struct list_head bd_list; |
665 | /* |
666 | * Private data. You must have bd_claim'ed the block_device |
667 | * to use this. NOTE: bd_claim allows an owner to claim |
668 | * the same device multiple times, the owner must take special |
669 | * care to not mess up bd_private for that case. |
670 | */ |
671 | unsigned long bd_private; |
672 | |
673 | /* The counter of freeze processes */ |
674 | int bd_fsfreeze_count; |
675 | /* Mutex for freeze */ |
676 | struct mutex bd_fsfreeze_mutex; |
677 | }; |
678 | |
679 | /* |
680 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
681 | * radix trees |
682 | */ |
683 | #define PAGECACHE_TAG_DIRTY 0 |
684 | #define PAGECACHE_TAG_WRITEBACK 1 |
685 | |
686 | int mapping_tagged(struct address_space *mapping, int tag); |
687 | |
688 | /* |
689 | * Might pages of this file be mapped into userspace? |
690 | */ |
691 | static inline int mapping_mapped(struct address_space *mapping) |
692 | { |
693 | return !prio_tree_empty(&mapping->i_mmap) || |
694 | !list_empty(&mapping->i_mmap_nonlinear); |
695 | } |
696 | |
697 | /* |
698 | * Might pages of this file have been modified in userspace? |
699 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
700 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
701 | * writing i.e. vma may be mprotected writable even if now readonly. |
702 | */ |
703 | static inline int mapping_writably_mapped(struct address_space *mapping) |
704 | { |
705 | return mapping->i_mmap_writable != 0; |
706 | } |
707 | |
708 | /* |
709 | * Use sequence counter to get consistent i_size on 32-bit processors. |
710 | */ |
711 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
712 | #include <linux/seqlock.h> |
713 | #define __NEED_I_SIZE_ORDERED |
714 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
715 | #else |
716 | #define i_size_ordered_init(inode) do { } while (0) |
717 | #endif |
718 | |
719 | struct posix_acl; |
720 | #define ACL_NOT_CACHED ((void *)(-1)) |
721 | |
722 | struct inode { |
723 | struct hlist_node i_hash; |
724 | struct list_head i_list; /* backing dev IO list */ |
725 | struct list_head i_sb_list; |
726 | struct list_head i_dentry; |
727 | unsigned long i_ino; |
728 | atomic_t i_count; |
729 | unsigned int i_nlink; |
730 | uid_t i_uid; |
731 | gid_t i_gid; |
732 | dev_t i_rdev; |
733 | u64 i_version; |
734 | loff_t i_size; |
735 | #ifdef __NEED_I_SIZE_ORDERED |
736 | seqcount_t i_size_seqcount; |
737 | #endif |
738 | struct timespec i_atime; |
739 | struct timespec i_mtime; |
740 | struct timespec i_ctime; |
741 | blkcnt_t i_blocks; |
742 | unsigned int i_blkbits; |
743 | unsigned short i_bytes; |
744 | umode_t i_mode; |
745 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
746 | struct mutex i_mutex; |
747 | struct rw_semaphore i_alloc_sem; |
748 | const struct inode_operations *i_op; |
749 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
750 | struct super_block *i_sb; |
751 | struct file_lock *i_flock; |
752 | struct address_space *i_mapping; |
753 | struct address_space i_data; |
754 | #ifdef CONFIG_QUOTA |
755 | struct dquot *i_dquot[MAXQUOTAS]; |
756 | #endif |
757 | struct list_head i_devices; |
758 | union { |
759 | struct pipe_inode_info *i_pipe; |
760 | struct block_device *i_bdev; |
761 | struct cdev *i_cdev; |
762 | }; |
763 | |
764 | __u32 i_generation; |
765 | |
766 | #ifdef CONFIG_FSNOTIFY |
767 | __u32 i_fsnotify_mask; /* all events this inode cares about */ |
768 | struct hlist_head i_fsnotify_mark_entries; /* fsnotify mark entries */ |
769 | #endif |
770 | |
771 | #ifdef CONFIG_INOTIFY |
772 | struct list_head inotify_watches; /* watches on this inode */ |
773 | struct mutex inotify_mutex; /* protects the watches list */ |
774 | #endif |
775 | |
776 | unsigned long i_state; |
777 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
778 | |
779 | unsigned int i_flags; |
780 | |
781 | atomic_t i_writecount; |
782 | #ifdef CONFIG_SECURITY |
783 | void *i_security; |
784 | #endif |
785 | #ifdef CONFIG_FS_POSIX_ACL |
786 | struct posix_acl *i_acl; |
787 | struct posix_acl *i_default_acl; |
788 | #endif |
789 | void *i_private; /* fs or device private pointer */ |
790 | }; |
791 | |
792 | /* |
793 | * inode->i_mutex nesting subclasses for the lock validator: |
794 | * |
795 | * 0: the object of the current VFS operation |
796 | * 1: parent |
797 | * 2: child/target |
798 | * 3: quota file |
799 | * |
800 | * The locking order between these classes is |
801 | * parent -> child -> normal -> xattr -> quota |
802 | */ |
803 | enum inode_i_mutex_lock_class |
804 | { |
805 | I_MUTEX_NORMAL, |
806 | I_MUTEX_PARENT, |
807 | I_MUTEX_CHILD, |
808 | I_MUTEX_XATTR, |
809 | I_MUTEX_QUOTA |
810 | }; |
811 | |
812 | /* |
813 | * NOTE: in a 32bit arch with a preemptable kernel and |
814 | * an UP compile the i_size_read/write must be atomic |
815 | * with respect to the local cpu (unlike with preempt disabled), |
816 | * but they don't need to be atomic with respect to other cpus like in |
817 | * true SMP (so they need either to either locally disable irq around |
818 | * the read or for example on x86 they can be still implemented as a |
819 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
820 | * and 64bit archs it makes no difference if preempt is enabled or not. |
821 | */ |
822 | static inline loff_t i_size_read(const struct inode *inode) |
823 | { |
824 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
825 | loff_t i_size; |
826 | unsigned int seq; |
827 | |
828 | do { |
829 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
830 | i_size = inode->i_size; |
831 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
832 | return i_size; |
833 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
834 | loff_t i_size; |
835 | |
836 | preempt_disable(); |
837 | i_size = inode->i_size; |
838 | preempt_enable(); |
839 | return i_size; |
840 | #else |
841 | return inode->i_size; |
842 | #endif |
843 | } |
844 | |
845 | /* |
846 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
847 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
848 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
849 | */ |
850 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
851 | { |
852 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
853 | write_seqcount_begin(&inode->i_size_seqcount); |
854 | inode->i_size = i_size; |
855 | write_seqcount_end(&inode->i_size_seqcount); |
856 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
857 | preempt_disable(); |
858 | inode->i_size = i_size; |
859 | preempt_enable(); |
860 | #else |
861 | inode->i_size = i_size; |
862 | #endif |
863 | } |
864 | |
865 | static inline unsigned iminor(const struct inode *inode) |
866 | { |
867 | return MINOR(inode->i_rdev); |
868 | } |
869 | |
870 | static inline unsigned imajor(const struct inode *inode) |
871 | { |
872 | return MAJOR(inode->i_rdev); |
873 | } |
874 | |
875 | extern struct block_device *I_BDEV(struct inode *inode); |
876 | |
877 | struct fown_struct { |
878 | rwlock_t lock; /* protects pid, uid, euid fields */ |
879 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
880 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ |
881 | uid_t uid, euid; /* uid/euid of process setting the owner */ |
882 | int signum; /* posix.1b rt signal to be delivered on IO */ |
883 | }; |
884 | |
885 | /* |
886 | * Track a single file's readahead state |
887 | */ |
888 | struct file_ra_state { |
889 | pgoff_t start; /* where readahead started */ |
890 | unsigned int size; /* # of readahead pages */ |
891 | unsigned int async_size; /* do asynchronous readahead when |
892 | there are only # of pages ahead */ |
893 | |
894 | unsigned int ra_pages; /* Maximum readahead window */ |
895 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
896 | loff_t prev_pos; /* Cache last read() position */ |
897 | }; |
898 | |
899 | /* |
900 | * Check if @index falls in the readahead windows. |
901 | */ |
902 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
903 | { |
904 | return (index >= ra->start && |
905 | index < ra->start + ra->size); |
906 | } |
907 | |
908 | #define FILE_MNT_WRITE_TAKEN 1 |
909 | #define FILE_MNT_WRITE_RELEASED 2 |
910 | |
911 | struct file { |
912 | /* |
913 | * fu_list becomes invalid after file_free is called and queued via |
914 | * fu_rcuhead for RCU freeing |
915 | */ |
916 | union { |
917 | struct list_head fu_list; |
918 | struct rcu_head fu_rcuhead; |
919 | } f_u; |
920 | struct path f_path; |
921 | #define f_dentry f_path.dentry |
922 | #define f_vfsmnt f_path.mnt |
923 | const struct file_operations *f_op; |
924 | spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */ |
925 | atomic_long_t f_count; |
926 | unsigned int f_flags; |
927 | fmode_t f_mode; |
928 | loff_t f_pos; |
929 | struct fown_struct f_owner; |
930 | const struct cred *f_cred; |
931 | struct file_ra_state f_ra; |
932 | |
933 | u64 f_version; |
934 | #ifdef CONFIG_SECURITY |
935 | void *f_security; |
936 | #endif |
937 | /* needed for tty driver, and maybe others */ |
938 | void *private_data; |
939 | |
940 | #ifdef CONFIG_EPOLL |
941 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
942 | struct list_head f_ep_links; |
943 | #endif /* #ifdef CONFIG_EPOLL */ |
944 | struct address_space *f_mapping; |
945 | #ifdef CONFIG_DEBUG_WRITECOUNT |
946 | unsigned long f_mnt_write_state; |
947 | #endif |
948 | }; |
949 | extern spinlock_t files_lock; |
950 | #define file_list_lock() spin_lock(&files_lock); |
951 | #define file_list_unlock() spin_unlock(&files_lock); |
952 | |
953 | #define get_file(x) atomic_long_inc(&(x)->f_count) |
954 | #define file_count(x) atomic_long_read(&(x)->f_count) |
955 | |
956 | #ifdef CONFIG_DEBUG_WRITECOUNT |
957 | static inline void file_take_write(struct file *f) |
958 | { |
959 | WARN_ON(f->f_mnt_write_state != 0); |
960 | f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; |
961 | } |
962 | static inline void file_release_write(struct file *f) |
963 | { |
964 | f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; |
965 | } |
966 | static inline void file_reset_write(struct file *f) |
967 | { |
968 | f->f_mnt_write_state = 0; |
969 | } |
970 | static inline void file_check_state(struct file *f) |
971 | { |
972 | /* |
973 | * At this point, either both or neither of these bits |
974 | * should be set. |
975 | */ |
976 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); |
977 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); |
978 | } |
979 | static inline int file_check_writeable(struct file *f) |
980 | { |
981 | if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) |
982 | return 0; |
983 | printk(KERN_WARNING "writeable file with no " |
984 | "mnt_want_write()\n"); |
985 | WARN_ON(1); |
986 | return -EINVAL; |
987 | } |
988 | #else /* !CONFIG_DEBUG_WRITECOUNT */ |
989 | static inline void file_take_write(struct file *filp) {} |
990 | static inline void file_release_write(struct file *filp) {} |
991 | static inline void file_reset_write(struct file *filp) {} |
992 | static inline void file_check_state(struct file *filp) {} |
993 | static inline int file_check_writeable(struct file *filp) |
994 | { |
995 | return 0; |
996 | } |
997 | #endif /* CONFIG_DEBUG_WRITECOUNT */ |
998 | |
999 | #define MAX_NON_LFS ((1UL<<31) - 1) |
1000 | |
1001 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
1002 | limits, otherwise bad things can happen in VM. */ |
1003 | #if BITS_PER_LONG==32 |
1004 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
1005 | #elif BITS_PER_LONG==64 |
1006 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL |
1007 | #endif |
1008 | |
1009 | #define FL_POSIX 1 |
1010 | #define FL_FLOCK 2 |
1011 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
1012 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1013 | #define FL_LEASE 32 /* lease held on this file */ |
1014 | #define FL_CLOSE 64 /* unlock on close */ |
1015 | #define FL_SLEEP 128 /* A blocking lock */ |
1016 | |
1017 | /* |
1018 | * Special return value from posix_lock_file() and vfs_lock_file() for |
1019 | * asynchronous locking. |
1020 | */ |
1021 | #define FILE_LOCK_DEFERRED 1 |
1022 | |
1023 | /* |
1024 | * The POSIX file lock owner is determined by |
1025 | * the "struct files_struct" in the thread group |
1026 | * (or NULL for no owner - BSD locks). |
1027 | * |
1028 | * Lockd stuffs a "host" pointer into this. |
1029 | */ |
1030 | typedef struct files_struct *fl_owner_t; |
1031 | |
1032 | struct file_lock_operations { |
1033 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
1034 | void (*fl_release_private)(struct file_lock *); |
1035 | }; |
1036 | |
1037 | struct lock_manager_operations { |
1038 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); |
1039 | void (*fl_notify)(struct file_lock *); /* unblock callback */ |
1040 | int (*fl_grant)(struct file_lock *, struct file_lock *, int); |
1041 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
1042 | void (*fl_release_private)(struct file_lock *); |
1043 | void (*fl_break)(struct file_lock *); |
1044 | int (*fl_mylease)(struct file_lock *, struct file_lock *); |
1045 | int (*fl_change)(struct file_lock **, int); |
1046 | }; |
1047 | |
1048 | struct lock_manager { |
1049 | struct list_head list; |
1050 | }; |
1051 | |
1052 | void locks_start_grace(struct lock_manager *); |
1053 | void locks_end_grace(struct lock_manager *); |
1054 | int locks_in_grace(void); |
1055 | |
1056 | /* that will die - we need it for nfs_lock_info */ |
1057 | #include <linux/nfs_fs_i.h> |
1058 | |
1059 | struct file_lock { |
1060 | struct file_lock *fl_next; /* singly linked list for this inode */ |
1061 | struct list_head fl_link; /* doubly linked list of all locks */ |
1062 | struct list_head fl_block; /* circular list of blocked processes */ |
1063 | fl_owner_t fl_owner; |
1064 | unsigned char fl_flags; |
1065 | unsigned char fl_type; |
1066 | unsigned int fl_pid; |
1067 | struct pid *fl_nspid; |
1068 | wait_queue_head_t fl_wait; |
1069 | struct file *fl_file; |
1070 | loff_t fl_start; |
1071 | loff_t fl_end; |
1072 | |
1073 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
1074 | unsigned long fl_break_time; /* for nonblocking lease breaks */ |
1075 | |
1076 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
1077 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1078 | union { |
1079 | struct nfs_lock_info nfs_fl; |
1080 | struct nfs4_lock_info nfs4_fl; |
1081 | struct { |
1082 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
1083 | int state; /* state of grant or error if -ve */ |
1084 | } afs; |
1085 | } fl_u; |
1086 | }; |
1087 | |
1088 | /* The following constant reflects the upper bound of the file/locking space */ |
1089 | #ifndef OFFSET_MAX |
1090 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
1091 | #define OFFSET_MAX INT_LIMIT(loff_t) |
1092 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
1093 | #endif |
1094 | |
1095 | #include <linux/fcntl.h> |
1096 | |
1097 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1098 | |
1099 | /* fs/sync.c */ |
1100 | extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset, |
1101 | loff_t endbyte, unsigned int flags); |
1102 | |
1103 | #ifdef CONFIG_FILE_LOCKING |
1104 | extern int fcntl_getlk(struct file *, struct flock __user *); |
1105 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
1106 | struct flock __user *); |
1107 | |
1108 | #if BITS_PER_LONG == 32 |
1109 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); |
1110 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1111 | struct flock64 __user *); |
1112 | #endif |
1113 | |
1114 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1115 | extern int fcntl_getlease(struct file *filp); |
1116 | |
1117 | /* fs/locks.c */ |
1118 | extern void locks_init_lock(struct file_lock *); |
1119 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
1120 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
1121 | extern void locks_remove_posix(struct file *, fl_owner_t); |
1122 | extern void locks_remove_flock(struct file *); |
1123 | extern void locks_release_private(struct file_lock *); |
1124 | extern void posix_test_lock(struct file *, struct file_lock *); |
1125 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
1126 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
1127 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
1128 | extern int vfs_test_lock(struct file *, struct file_lock *); |
1129 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
1130 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
1131 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
1132 | extern int __break_lease(struct inode *inode, unsigned int flags); |
1133 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
1134 | extern int generic_setlease(struct file *, long, struct file_lock **); |
1135 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
1136 | extern int lease_modify(struct file_lock **, int); |
1137 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
1138 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
1139 | #else /* !CONFIG_FILE_LOCKING */ |
1140 | static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
1141 | { |
1142 | return -EINVAL; |
1143 | } |
1144 | |
1145 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
1146 | unsigned int cmd, struct flock __user *user) |
1147 | { |
1148 | return -EACCES; |
1149 | } |
1150 | |
1151 | #if BITS_PER_LONG == 32 |
1152 | static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
1153 | { |
1154 | return -EINVAL; |
1155 | } |
1156 | |
1157 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
1158 | unsigned int cmd, struct flock64 __user *user) |
1159 | { |
1160 | return -EACCES; |
1161 | } |
1162 | #endif |
1163 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1164 | { |
1165 | return 0; |
1166 | } |
1167 | |
1168 | static inline int fcntl_getlease(struct file *filp) |
1169 | { |
1170 | return 0; |
1171 | } |
1172 | |
1173 | static inline void locks_init_lock(struct file_lock *fl) |
1174 | { |
1175 | return; |
1176 | } |
1177 | |
1178 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
1179 | { |
1180 | return; |
1181 | } |
1182 | |
1183 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
1184 | { |
1185 | return; |
1186 | } |
1187 | |
1188 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
1189 | { |
1190 | return; |
1191 | } |
1192 | |
1193 | static inline void locks_remove_flock(struct file *filp) |
1194 | { |
1195 | return; |
1196 | } |
1197 | |
1198 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
1199 | { |
1200 | return; |
1201 | } |
1202 | |
1203 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
1204 | struct file_lock *conflock) |
1205 | { |
1206 | return -ENOLCK; |
1207 | } |
1208 | |
1209 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) |
1210 | { |
1211 | return -ENOLCK; |
1212 | } |
1213 | |
1214 | static inline int posix_unblock_lock(struct file *filp, |
1215 | struct file_lock *waiter) |
1216 | { |
1217 | return -ENOENT; |
1218 | } |
1219 | |
1220 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
1221 | { |
1222 | return 0; |
1223 | } |
1224 | |
1225 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
1226 | struct file_lock *fl, struct file_lock *conf) |
1227 | { |
1228 | return -ENOLCK; |
1229 | } |
1230 | |
1231 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
1232 | { |
1233 | return 0; |
1234 | } |
1235 | |
1236 | static inline int flock_lock_file_wait(struct file *filp, |
1237 | struct file_lock *request) |
1238 | { |
1239 | return -ENOLCK; |
1240 | } |
1241 | |
1242 | static inline int __break_lease(struct inode *inode, unsigned int mode) |
1243 | { |
1244 | return 0; |
1245 | } |
1246 | |
1247 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
1248 | { |
1249 | return; |
1250 | } |
1251 | |
1252 | static inline int generic_setlease(struct file *filp, long arg, |
1253 | struct file_lock **flp) |
1254 | { |
1255 | return -EINVAL; |
1256 | } |
1257 | |
1258 | static inline int vfs_setlease(struct file *filp, long arg, |
1259 | struct file_lock **lease) |
1260 | { |
1261 | return -EINVAL; |
1262 | } |
1263 | |
1264 | static inline int lease_modify(struct file_lock **before, int arg) |
1265 | { |
1266 | return -EINVAL; |
1267 | } |
1268 | |
1269 | static inline int lock_may_read(struct inode *inode, loff_t start, |
1270 | unsigned long len) |
1271 | { |
1272 | return 1; |
1273 | } |
1274 | |
1275 | static inline int lock_may_write(struct inode *inode, loff_t start, |
1276 | unsigned long len) |
1277 | { |
1278 | return 1; |
1279 | } |
1280 | |
1281 | #endif /* !CONFIG_FILE_LOCKING */ |
1282 | |
1283 | |
1284 | struct fasync_struct { |
1285 | int magic; |
1286 | int fa_fd; |
1287 | struct fasync_struct *fa_next; /* singly linked list */ |
1288 | struct file *fa_file; |
1289 | }; |
1290 | |
1291 | #define FASYNC_MAGIC 0x4601 |
1292 | |
1293 | /* SMP safe fasync helpers: */ |
1294 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
1295 | /* can be called from interrupts */ |
1296 | extern void kill_fasync(struct fasync_struct **, int, int); |
1297 | /* only for net: no internal synchronization */ |
1298 | extern void __kill_fasync(struct fasync_struct *, int, int); |
1299 | |
1300 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1301 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1302 | extern void f_delown(struct file *filp); |
1303 | extern pid_t f_getown(struct file *filp); |
1304 | extern int send_sigurg(struct fown_struct *fown); |
1305 | |
1306 | /* |
1307 | * Umount options |
1308 | */ |
1309 | |
1310 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
1311 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
1312 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
1313 | |
1314 | extern struct list_head super_blocks; |
1315 | extern spinlock_t sb_lock; |
1316 | |
1317 | #define sb_entry(list) list_entry((list), struct super_block, s_list) |
1318 | #define S_BIAS (1<<30) |
1319 | struct super_block { |
1320 | struct list_head s_list; /* Keep this first */ |
1321 | dev_t s_dev; /* search index; _not_ kdev_t */ |
1322 | unsigned long s_blocksize; |
1323 | unsigned char s_blocksize_bits; |
1324 | unsigned char s_dirt; |
1325 | loff_t s_maxbytes; /* Max file size */ |
1326 | struct file_system_type *s_type; |
1327 | const struct super_operations *s_op; |
1328 | const struct dquot_operations *dq_op; |
1329 | const struct quotactl_ops *s_qcop; |
1330 | const struct export_operations *s_export_op; |
1331 | unsigned long s_flags; |
1332 | unsigned long s_magic; |
1333 | struct dentry *s_root; |
1334 | struct rw_semaphore s_umount; |
1335 | struct mutex s_lock; |
1336 | int s_count; |
1337 | int s_need_sync; |
1338 | atomic_t s_active; |
1339 | #ifdef CONFIG_SECURITY |
1340 | void *s_security; |
1341 | #endif |
1342 | struct xattr_handler **s_xattr; |
1343 | |
1344 | struct list_head s_inodes; /* all inodes */ |
1345 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ |
1346 | struct list_head s_files; |
1347 | /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */ |
1348 | struct list_head s_dentry_lru; /* unused dentry lru */ |
1349 | int s_nr_dentry_unused; /* # of dentry on lru */ |
1350 | |
1351 | struct block_device *s_bdev; |
1352 | struct backing_dev_info *s_bdi; |
1353 | struct mtd_info *s_mtd; |
1354 | struct list_head s_instances; |
1355 | struct quota_info s_dquot; /* Diskquota specific options */ |
1356 | |
1357 | int s_frozen; |
1358 | wait_queue_head_t s_wait_unfrozen; |
1359 | |
1360 | char s_id[32]; /* Informational name */ |
1361 | |
1362 | void *s_fs_info; /* Filesystem private info */ |
1363 | fmode_t s_mode; |
1364 | |
1365 | /* |
1366 | * The next field is for VFS *only*. No filesystems have any business |
1367 | * even looking at it. You had been warned. |
1368 | */ |
1369 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1370 | |
1371 | /* Granularity of c/m/atime in ns. |
1372 | Cannot be worse than a second */ |
1373 | u32 s_time_gran; |
1374 | |
1375 | /* |
1376 | * Filesystem subtype. If non-empty the filesystem type field |
1377 | * in /proc/mounts will be "type.subtype" |
1378 | */ |
1379 | char *s_subtype; |
1380 | |
1381 | /* |
1382 | * Saved mount options for lazy filesystems using |
1383 | * generic_show_options() |
1384 | */ |
1385 | char *s_options; |
1386 | }; |
1387 | |
1388 | extern struct timespec current_fs_time(struct super_block *sb); |
1389 | |
1390 | /* |
1391 | * Snapshotting support. |
1392 | */ |
1393 | enum { |
1394 | SB_UNFROZEN = 0, |
1395 | SB_FREEZE_WRITE = 1, |
1396 | SB_FREEZE_TRANS = 2, |
1397 | }; |
1398 | |
1399 | #define vfs_check_frozen(sb, level) \ |
1400 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) |
1401 | |
1402 | #define get_fs_excl() atomic_inc(¤t->fs_excl) |
1403 | #define put_fs_excl() atomic_dec(¤t->fs_excl) |
1404 | #define has_fs_excl() atomic_read(¤t->fs_excl) |
1405 | |
1406 | #define is_owner_or_cap(inode) \ |
1407 | ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER)) |
1408 | |
1409 | /* not quite ready to be deprecated, but... */ |
1410 | extern void lock_super(struct super_block *); |
1411 | extern void unlock_super(struct super_block *); |
1412 | |
1413 | /* |
1414 | * VFS helper functions.. |
1415 | */ |
1416 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
1417 | extern int vfs_mkdir(struct inode *, struct dentry *, int); |
1418 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); |
1419 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
1420 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
1421 | extern int vfs_rmdir(struct inode *, struct dentry *); |
1422 | extern int vfs_unlink(struct inode *, struct dentry *); |
1423 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
1424 | |
1425 | /* |
1426 | * VFS dentry helper functions. |
1427 | */ |
1428 | extern void dentry_unhash(struct dentry *dentry); |
1429 | |
1430 | /* |
1431 | * VFS file helper functions. |
1432 | */ |
1433 | extern int file_permission(struct file *, int); |
1434 | |
1435 | /* |
1436 | * VFS FS_IOC_FIEMAP helper definitions. |
1437 | */ |
1438 | struct fiemap_extent_info { |
1439 | unsigned int fi_flags; /* Flags as passed from user */ |
1440 | unsigned int fi_extents_mapped; /* Number of mapped extents */ |
1441 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
1442 | struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent |
1443 | * array */ |
1444 | }; |
1445 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
1446 | u64 phys, u64 len, u32 flags); |
1447 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
1448 | |
1449 | /* |
1450 | * File types |
1451 | * |
1452 | * NOTE! These match bits 12..15 of stat.st_mode |
1453 | * (ie "(i_mode >> 12) & 15"). |
1454 | */ |
1455 | #define DT_UNKNOWN 0 |
1456 | #define DT_FIFO 1 |
1457 | #define DT_CHR 2 |
1458 | #define DT_DIR 4 |
1459 | #define DT_BLK 6 |
1460 | #define DT_REG 8 |
1461 | #define DT_LNK 10 |
1462 | #define DT_SOCK 12 |
1463 | #define DT_WHT 14 |
1464 | |
1465 | /* |
1466 | * This is the "filldir" function type, used by readdir() to let |
1467 | * the kernel specify what kind of dirent layout it wants to have. |
1468 | * This allows the kernel to read directories into kernel space or |
1469 | * to have different dirent layouts depending on the binary type. |
1470 | */ |
1471 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
1472 | struct block_device_operations; |
1473 | |
1474 | /* These macros are for out of kernel modules to test that |
1475 | * the kernel supports the unlocked_ioctl and compat_ioctl |
1476 | * fields in struct file_operations. */ |
1477 | #define HAVE_COMPAT_IOCTL 1 |
1478 | #define HAVE_UNLOCKED_IOCTL 1 |
1479 | |
1480 | /* |
1481 | * NOTE: |
1482 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl |
1483 | * can be called without the big kernel lock held in all filesystems. |
1484 | */ |
1485 | struct file_operations { |
1486 | struct module *owner; |
1487 | loff_t (*llseek) (struct file *, loff_t, int); |
1488 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
1489 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
1490 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1491 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1492 | int (*readdir) (struct file *, void *, filldir_t); |
1493 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
1494 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); |
1495 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1496 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
1497 | int (*mmap) (struct file *, struct vm_area_struct *); |
1498 | int (*open) (struct inode *, struct file *); |
1499 | int (*flush) (struct file *, fl_owner_t id); |
1500 | int (*release) (struct inode *, struct file *); |
1501 | int (*fsync) (struct file *, struct dentry *, int datasync); |
1502 | int (*aio_fsync) (struct kiocb *, int datasync); |
1503 | int (*fasync) (int, struct file *, int); |
1504 | int (*lock) (struct file *, int, struct file_lock *); |
1505 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1506 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
1507 | int (*check_flags)(int); |
1508 | int (*flock) (struct file *, int, struct file_lock *); |
1509 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1510 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
1511 | int (*setlease)(struct file *, long, struct file_lock **); |
1512 | }; |
1513 | |
1514 | struct inode_operations { |
1515 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); |
1516 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); |
1517 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1518 | int (*unlink) (struct inode *,struct dentry *); |
1519 | int (*symlink) (struct inode *,struct dentry *,const char *); |
1520 | int (*mkdir) (struct inode *,struct dentry *,int); |
1521 | int (*rmdir) (struct inode *,struct dentry *); |
1522 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); |
1523 | int (*rename) (struct inode *, struct dentry *, |
1524 | struct inode *, struct dentry *); |
1525 | int (*readlink) (struct dentry *, char __user *,int); |
1526 | void * (*follow_link) (struct dentry *, struct nameidata *); |
1527 | void (*put_link) (struct dentry *, struct nameidata *, void *); |
1528 | void (*truncate) (struct inode *); |
1529 | int (*permission) (struct inode *, int); |
1530 | int (*check_acl)(struct inode *, int); |
1531 | int (*setattr) (struct dentry *, struct iattr *); |
1532 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
1533 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
1534 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
1535 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
1536 | int (*removexattr) (struct dentry *, const char *); |
1537 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
1538 | long (*fallocate)(struct inode *inode, int mode, loff_t offset, |
1539 | loff_t len); |
1540 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1541 | u64 len); |
1542 | }; |
1543 | |
1544 | struct seq_file; |
1545 | |
1546 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
1547 | unsigned long nr_segs, unsigned long fast_segs, |
1548 | struct iovec *fast_pointer, |
1549 | struct iovec **ret_pointer); |
1550 | |
1551 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1552 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
1553 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
1554 | unsigned long, loff_t *); |
1555 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
1556 | unsigned long, loff_t *); |
1557 | |
1558 | struct super_operations { |
1559 | struct inode *(*alloc_inode)(struct super_block *sb); |
1560 | void (*destroy_inode)(struct inode *); |
1561 | |
1562 | void (*dirty_inode) (struct inode *); |
1563 | int (*write_inode) (struct inode *, int); |
1564 | void (*drop_inode) (struct inode *); |
1565 | void (*delete_inode) (struct inode *); |
1566 | void (*put_super) (struct super_block *); |
1567 | void (*write_super) (struct super_block *); |
1568 | int (*sync_fs)(struct super_block *sb, int wait); |
1569 | int (*freeze_fs) (struct super_block *); |
1570 | int (*unfreeze_fs) (struct super_block *); |
1571 | int (*statfs) (struct dentry *, struct kstatfs *); |
1572 | int (*remount_fs) (struct super_block *, int *, char *); |
1573 | void (*clear_inode) (struct inode *); |
1574 | void (*umount_begin) (struct super_block *); |
1575 | |
1576 | int (*show_options)(struct seq_file *, struct vfsmount *); |
1577 | int (*show_stats)(struct seq_file *, struct vfsmount *); |
1578 | #ifdef CONFIG_QUOTA |
1579 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1580 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
1581 | #endif |
1582 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
1583 | }; |
1584 | |
1585 | /* |
1586 | * Inode state bits. Protected by inode_lock. |
1587 | * |
1588 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
1589 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
1590 | * |
1591 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
1592 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
1593 | * various stages of removing an inode. |
1594 | * |
1595 | * Two bits are used for locking and completion notification, I_LOCK and I_SYNC. |
1596 | * |
1597 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1598 | * fdatasync(). i_atime is the usual cause. |
1599 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1600 | * these changes separately from I_DIRTY_SYNC so that we |
1601 | * don't have to write inode on fdatasync() when only |
1602 | * mtime has changed in it. |
1603 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
1604 | * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both |
1605 | * are cleared by unlock_new_inode(), called from iget(). |
1606 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1607 | * is zero. I_FREEING must be set when I_WILL_FREE is |
1608 | * cleared. |
1609 | * I_FREEING Set when inode is about to be freed but still has dirty |
1610 | * pages or buffers attached or the inode itself is still |
1611 | * dirty. |
1612 | * I_CLEAR Set by clear_inode(). In this state the inode is clean |
1613 | * and can be destroyed. |
1614 | * |
1615 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
1616 | * prohibited for many purposes. iget() must wait for |
1617 | * the inode to be completely released, then create it |
1618 | * anew. Other functions will just ignore such inodes, |
1619 | * if appropriate. I_LOCK is used for waiting. |
1620 | * |
1621 | * I_LOCK Serves as both a mutex and completion notification. |
1622 | * New inodes set I_LOCK. If two processes both create |
1623 | * the same inode, one of them will release its inode and |
1624 | * wait for I_LOCK to be released before returning. |
1625 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
1626 | * also cause waiting on I_LOCK, without I_LOCK actually |
1627 | * being set. find_inode() uses this to prevent returning |
1628 | * nearly-dead inodes. |
1629 | * I_SYNC Similar to I_LOCK, but limited in scope to writeback |
1630 | * of inode dirty data. Having a separate lock for this |
1631 | * purpose reduces latency and prevents some filesystem- |
1632 | * specific deadlocks. |
1633 | * |
1634 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1635 | * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on |
1636 | * I_CLEAR? If not, why? |
1637 | */ |
1638 | #define I_DIRTY_SYNC 1 |
1639 | #define I_DIRTY_DATASYNC 2 |
1640 | #define I_DIRTY_PAGES 4 |
1641 | #define I_NEW 8 |
1642 | #define I_WILL_FREE 16 |
1643 | #define I_FREEING 32 |
1644 | #define I_CLEAR 64 |
1645 | #define __I_LOCK 7 |
1646 | #define I_LOCK (1 << __I_LOCK) |
1647 | #define __I_SYNC 8 |
1648 | #define I_SYNC (1 << __I_SYNC) |
1649 | |
1650 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
1651 | |
1652 | extern void __mark_inode_dirty(struct inode *, int); |
1653 | static inline void mark_inode_dirty(struct inode *inode) |
1654 | { |
1655 | __mark_inode_dirty(inode, I_DIRTY); |
1656 | } |
1657 | |
1658 | static inline void mark_inode_dirty_sync(struct inode *inode) |
1659 | { |
1660 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
1661 | } |
1662 | |
1663 | /** |
1664 | * inc_nlink - directly increment an inode's link count |
1665 | * @inode: inode |
1666 | * |
1667 | * This is a low-level filesystem helper to replace any |
1668 | * direct filesystem manipulation of i_nlink. Currently, |
1669 | * it is only here for parity with dec_nlink(). |
1670 | */ |
1671 | static inline void inc_nlink(struct inode *inode) |
1672 | { |
1673 | inode->i_nlink++; |
1674 | } |
1675 | |
1676 | static inline void inode_inc_link_count(struct inode *inode) |
1677 | { |
1678 | inc_nlink(inode); |
1679 | mark_inode_dirty(inode); |
1680 | } |
1681 | |
1682 | /** |
1683 | * drop_nlink - directly drop an inode's link count |
1684 | * @inode: inode |
1685 | * |
1686 | * This is a low-level filesystem helper to replace any |
1687 | * direct filesystem manipulation of i_nlink. In cases |
1688 | * where we are attempting to track writes to the |
1689 | * filesystem, a decrement to zero means an imminent |
1690 | * write when the file is truncated and actually unlinked |
1691 | * on the filesystem. |
1692 | */ |
1693 | static inline void drop_nlink(struct inode *inode) |
1694 | { |
1695 | inode->i_nlink--; |
1696 | } |
1697 | |
1698 | /** |
1699 | * clear_nlink - directly zero an inode's link count |
1700 | * @inode: inode |
1701 | * |
1702 | * This is a low-level filesystem helper to replace any |
1703 | * direct filesystem manipulation of i_nlink. See |
1704 | * drop_nlink() for why we care about i_nlink hitting zero. |
1705 | */ |
1706 | static inline void clear_nlink(struct inode *inode) |
1707 | { |
1708 | inode->i_nlink = 0; |
1709 | } |
1710 | |
1711 | static inline void inode_dec_link_count(struct inode *inode) |
1712 | { |
1713 | drop_nlink(inode); |
1714 | mark_inode_dirty(inode); |
1715 | } |
1716 | |
1717 | /** |
1718 | * inode_inc_iversion - increments i_version |
1719 | * @inode: inode that need to be updated |
1720 | * |
1721 | * Every time the inode is modified, the i_version field will be incremented. |
1722 | * The filesystem has to be mounted with i_version flag |
1723 | */ |
1724 | |
1725 | static inline void inode_inc_iversion(struct inode *inode) |
1726 | { |
1727 | spin_lock(&inode->i_lock); |
1728 | inode->i_version++; |
1729 | spin_unlock(&inode->i_lock); |
1730 | } |
1731 | |
1732 | extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
1733 | static inline void file_accessed(struct file *file) |
1734 | { |
1735 | if (!(file->f_flags & O_NOATIME)) |
1736 | touch_atime(file->f_path.mnt, file->f_path.dentry); |
1737 | } |
1738 | |
1739 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
1740 | |
1741 | struct file_system_type { |
1742 | const char *name; |
1743 | int fs_flags; |
1744 | int (*get_sb) (struct file_system_type *, int, |
1745 | const char *, void *, struct vfsmount *); |
1746 | void (*kill_sb) (struct super_block *); |
1747 | struct module *owner; |
1748 | struct file_system_type * next; |
1749 | struct list_head fs_supers; |
1750 | |
1751 | struct lock_class_key s_lock_key; |
1752 | struct lock_class_key s_umount_key; |
1753 | |
1754 | struct lock_class_key i_lock_key; |
1755 | struct lock_class_key i_mutex_key; |
1756 | struct lock_class_key i_mutex_dir_key; |
1757 | struct lock_class_key i_alloc_sem_key; |
1758 | }; |
1759 | |
1760 | extern int get_sb_ns(struct file_system_type *fs_type, int flags, void *data, |
1761 | int (*fill_super)(struct super_block *, void *, int), |
1762 | struct vfsmount *mnt); |
1763 | extern int get_sb_bdev(struct file_system_type *fs_type, |
1764 | int flags, const char *dev_name, void *data, |
1765 | int (*fill_super)(struct super_block *, void *, int), |
1766 | struct vfsmount *mnt); |
1767 | extern int get_sb_single(struct file_system_type *fs_type, |
1768 | int flags, void *data, |
1769 | int (*fill_super)(struct super_block *, void *, int), |
1770 | struct vfsmount *mnt); |
1771 | extern int get_sb_nodev(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 | void generic_shutdown_super(struct super_block *sb); |
1776 | void kill_block_super(struct super_block *sb); |
1777 | void kill_anon_super(struct super_block *sb); |
1778 | void kill_litter_super(struct super_block *sb); |
1779 | void deactivate_super(struct super_block *sb); |
1780 | void deactivate_locked_super(struct super_block *sb); |
1781 | int set_anon_super(struct super_block *s, void *data); |
1782 | struct super_block *sget(struct file_system_type *type, |
1783 | int (*test)(struct super_block *,void *), |
1784 | int (*set)(struct super_block *,void *), |
1785 | void *data); |
1786 | extern int get_sb_pseudo(struct file_system_type *, char *, |
1787 | const struct super_operations *ops, unsigned long, |
1788 | struct vfsmount *mnt); |
1789 | extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); |
1790 | int __put_super_and_need_restart(struct super_block *sb); |
1791 | void put_super(struct super_block *sb); |
1792 | |
1793 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
1794 | #define fops_get(fops) \ |
1795 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
1796 | #define fops_put(fops) \ |
1797 | do { if (fops) module_put((fops)->owner); } while(0) |
1798 | |
1799 | extern int register_filesystem(struct file_system_type *); |
1800 | extern int unregister_filesystem(struct file_system_type *); |
1801 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
1802 | #define kern_mount(type) kern_mount_data(type, NULL) |
1803 | extern int may_umount_tree(struct vfsmount *); |
1804 | extern int may_umount(struct vfsmount *); |
1805 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
1806 | extern struct vfsmount *collect_mounts(struct path *); |
1807 | extern void drop_collected_mounts(struct vfsmount *); |
1808 | |
1809 | extern int vfs_statfs(struct dentry *, struct kstatfs *); |
1810 | |
1811 | extern int current_umask(void); |
1812 | |
1813 | /* /sys/fs */ |
1814 | extern struct kobject *fs_kobj; |
1815 | |
1816 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
1817 | |
1818 | #define FLOCK_VERIFY_READ 1 |
1819 | #define FLOCK_VERIFY_WRITE 2 |
1820 | |
1821 | #ifdef CONFIG_FILE_LOCKING |
1822 | extern int locks_mandatory_locked(struct inode *); |
1823 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
1824 | |
1825 | /* |
1826 | * Candidates for mandatory locking have the setgid bit set |
1827 | * but no group execute bit - an otherwise meaningless combination. |
1828 | */ |
1829 | |
1830 | static inline int __mandatory_lock(struct inode *ino) |
1831 | { |
1832 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
1833 | } |
1834 | |
1835 | /* |
1836 | * ... and these candidates should be on MS_MANDLOCK mounted fs, |
1837 | * otherwise these will be advisory locks |
1838 | */ |
1839 | |
1840 | static inline int mandatory_lock(struct inode *ino) |
1841 | { |
1842 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
1843 | } |
1844 | |
1845 | static inline int locks_verify_locked(struct inode *inode) |
1846 | { |
1847 | if (mandatory_lock(inode)) |
1848 | return locks_mandatory_locked(inode); |
1849 | return 0; |
1850 | } |
1851 | |
1852 | static inline int locks_verify_truncate(struct inode *inode, |
1853 | struct file *filp, |
1854 | loff_t size) |
1855 | { |
1856 | if (inode->i_flock && mandatory_lock(inode)) |
1857 | return locks_mandatory_area( |
1858 | FLOCK_VERIFY_WRITE, inode, filp, |
1859 | size < inode->i_size ? size : inode->i_size, |
1860 | (size < inode->i_size ? inode->i_size - size |
1861 | : size - inode->i_size) |
1862 | ); |
1863 | return 0; |
1864 | } |
1865 | |
1866 | static inline int break_lease(struct inode *inode, unsigned int mode) |
1867 | { |
1868 | if (inode->i_flock) |
1869 | return __break_lease(inode, mode); |
1870 | return 0; |
1871 | } |
1872 | #else /* !CONFIG_FILE_LOCKING */ |
1873 | static inline int locks_mandatory_locked(struct inode *inode) |
1874 | { |
1875 | return 0; |
1876 | } |
1877 | |
1878 | static inline int locks_mandatory_area(int rw, struct inode *inode, |
1879 | struct file *filp, loff_t offset, |
1880 | size_t count) |
1881 | { |
1882 | return 0; |
1883 | } |
1884 | |
1885 | static inline int __mandatory_lock(struct inode *inode) |
1886 | { |
1887 | return 0; |
1888 | } |
1889 | |
1890 | static inline int mandatory_lock(struct inode *inode) |
1891 | { |
1892 | return 0; |
1893 | } |
1894 | |
1895 | static inline int locks_verify_locked(struct inode *inode) |
1896 | { |
1897 | return 0; |
1898 | } |
1899 | |
1900 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
1901 | size_t size) |
1902 | { |
1903 | return 0; |
1904 | } |
1905 | |
1906 | static inline int break_lease(struct inode *inode, unsigned int mode) |
1907 | { |
1908 | return 0; |
1909 | } |
1910 | |
1911 | #endif /* CONFIG_FILE_LOCKING */ |
1912 | |
1913 | /* fs/open.c */ |
1914 | |
1915 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
1916 | struct file *filp); |
1917 | extern int do_fallocate(struct file *file, int mode, loff_t offset, |
1918 | loff_t len); |
1919 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
1920 | int mode); |
1921 | extern struct file *filp_open(const char *, int, int); |
1922 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, |
1923 | const struct cred *); |
1924 | extern int filp_close(struct file *, fl_owner_t id); |
1925 | extern char * getname(const char __user *); |
1926 | |
1927 | /* fs/ioctl.c */ |
1928 | |
1929 | extern int ioctl_preallocate(struct file *filp, void __user *argp); |
1930 | |
1931 | /* fs/dcache.c */ |
1932 | extern void __init vfs_caches_init_early(void); |
1933 | extern void __init vfs_caches_init(unsigned long); |
1934 | |
1935 | extern struct kmem_cache *names_cachep; |
1936 | |
1937 | #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) |
1938 | #define __getname() __getname_gfp(GFP_KERNEL) |
1939 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1940 | #ifndef CONFIG_AUDITSYSCALL |
1941 | #define putname(name) __putname(name) |
1942 | #else |
1943 | extern void putname(const char *name); |
1944 | #endif |
1945 | |
1946 | #ifdef CONFIG_BLOCK |
1947 | extern int register_blkdev(unsigned int, const char *); |
1948 | extern void unregister_blkdev(unsigned int, const char *); |
1949 | extern struct block_device *bdget(dev_t); |
1950 | extern struct block_device *bdgrab(struct block_device *bdev); |
1951 | extern void bd_set_size(struct block_device *, loff_t size); |
1952 | extern void bd_forget(struct inode *inode); |
1953 | extern void bdput(struct block_device *); |
1954 | extern struct block_device *open_by_devnum(dev_t, fmode_t); |
1955 | extern void invalidate_bdev(struct block_device *); |
1956 | extern int sync_blockdev(struct block_device *bdev); |
1957 | extern struct super_block *freeze_bdev(struct block_device *); |
1958 | extern void emergency_thaw_all(void); |
1959 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
1960 | extern int fsync_bdev(struct block_device *); |
1961 | #else |
1962 | static inline void bd_forget(struct inode *inode) {} |
1963 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
1964 | static inline void invalidate_bdev(struct block_device *bdev) {} |
1965 | |
1966 | static inline struct super_block *freeze_bdev(struct block_device *sb) |
1967 | { |
1968 | return NULL; |
1969 | } |
1970 | |
1971 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
1972 | { |
1973 | return 0; |
1974 | } |
1975 | #endif |
1976 | extern int sync_filesystem(struct super_block *); |
1977 | extern const struct file_operations def_blk_fops; |
1978 | extern const struct file_operations def_chr_fops; |
1979 | extern const struct file_operations bad_sock_fops; |
1980 | extern const struct file_operations def_fifo_fops; |
1981 | #ifdef CONFIG_BLOCK |
1982 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
1983 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1984 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
1985 | extern int blkdev_get(struct block_device *, fmode_t); |
1986 | extern int blkdev_put(struct block_device *, fmode_t); |
1987 | extern int bd_claim(struct block_device *, void *); |
1988 | extern void bd_release(struct block_device *); |
1989 | #ifdef CONFIG_SYSFS |
1990 | extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); |
1991 | extern void bd_release_from_disk(struct block_device *, struct gendisk *); |
1992 | #else |
1993 | #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) |
1994 | #define bd_release_from_disk(bdev, disk) bd_release(bdev) |
1995 | #endif |
1996 | #endif |
1997 | |
1998 | /* fs/char_dev.c */ |
1999 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
2000 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2001 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
2002 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2003 | unsigned int count, const char *name, |
2004 | const struct file_operations *fops); |
2005 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
2006 | unsigned int count, const char *name); |
2007 | extern void unregister_chrdev_region(dev_t, unsigned); |
2008 | extern void chrdev_show(struct seq_file *,off_t); |
2009 | |
2010 | static inline int register_chrdev(unsigned int major, const char *name, |
2011 | const struct file_operations *fops) |
2012 | { |
2013 | return __register_chrdev(major, 0, 256, name, fops); |
2014 | } |
2015 | |
2016 | static inline void unregister_chrdev(unsigned int major, const char *name) |
2017 | { |
2018 | __unregister_chrdev(major, 0, 256, name); |
2019 | } |
2020 | |
2021 | /* fs/block_dev.c */ |
2022 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
2023 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
2024 | |
2025 | #ifdef CONFIG_BLOCK |
2026 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
2027 | extern const char *__bdevname(dev_t, char *buffer); |
2028 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
2029 | extern struct block_device *lookup_bdev(const char *); |
2030 | extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *); |
2031 | extern void close_bdev_exclusive(struct block_device *, fmode_t); |
2032 | extern void blkdev_show(struct seq_file *,off_t); |
2033 | |
2034 | #else |
2035 | #define BLKDEV_MAJOR_HASH_SIZE 0 |
2036 | #endif |
2037 | |
2038 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
2039 | |
2040 | /* Invalid inode operations -- fs/bad_inode.c */ |
2041 | extern void make_bad_inode(struct inode *); |
2042 | extern int is_bad_inode(struct inode *); |
2043 | |
2044 | extern const struct file_operations read_pipefifo_fops; |
2045 | extern const struct file_operations write_pipefifo_fops; |
2046 | extern const struct file_operations rdwr_pipefifo_fops; |
2047 | |
2048 | extern int fs_may_remount_ro(struct super_block *); |
2049 | |
2050 | #ifdef CONFIG_BLOCK |
2051 | /* |
2052 | * return READ, READA, or WRITE |
2053 | */ |
2054 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
2055 | |
2056 | /* |
2057 | * return data direction, READ or WRITE |
2058 | */ |
2059 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
2060 | |
2061 | extern void check_disk_size_change(struct gendisk *disk, |
2062 | struct block_device *bdev); |
2063 | extern int revalidate_disk(struct gendisk *); |
2064 | extern int check_disk_change(struct block_device *); |
2065 | extern int __invalidate_device(struct block_device *); |
2066 | extern int invalidate_partition(struct gendisk *, int); |
2067 | #endif |
2068 | extern int invalidate_inodes(struct super_block *); |
2069 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2070 | pgoff_t start, pgoff_t end); |
2071 | |
2072 | static inline unsigned long __deprecated |
2073 | invalidate_inode_pages(struct address_space *mapping) |
2074 | { |
2075 | return invalidate_mapping_pages(mapping, 0, ~0UL); |
2076 | } |
2077 | |
2078 | static inline void invalidate_remote_inode(struct inode *inode) |
2079 | { |
2080 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
2081 | S_ISLNK(inode->i_mode)) |
2082 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
2083 | } |
2084 | extern int invalidate_inode_pages2(struct address_space *mapping); |
2085 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
2086 | pgoff_t start, pgoff_t end); |
2087 | extern int write_inode_now(struct inode *, int); |
2088 | extern int filemap_fdatawrite(struct address_space *); |
2089 | extern int filemap_flush(struct address_space *); |
2090 | extern int filemap_fdatawait(struct address_space *); |
2091 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2092 | loff_t lend); |
2093 | extern int filemap_write_and_wait(struct address_space *mapping); |
2094 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
2095 | loff_t lstart, loff_t lend); |
2096 | extern int wait_on_page_writeback_range(struct address_space *mapping, |
2097 | pgoff_t start, pgoff_t end); |
2098 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2099 | loff_t start, loff_t end, int sync_mode); |
2100 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2101 | loff_t start, loff_t end); |
2102 | |
2103 | extern int vfs_fsync_range(struct file *file, struct dentry *dentry, |
2104 | loff_t start, loff_t end, int datasync); |
2105 | extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync); |
2106 | extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); |
2107 | extern void sync_supers(void); |
2108 | extern void emergency_sync(void); |
2109 | extern void emergency_remount(void); |
2110 | #ifdef CONFIG_BLOCK |
2111 | extern sector_t bmap(struct inode *, sector_t); |
2112 | #endif |
2113 | extern int notify_change(struct dentry *, struct iattr *); |
2114 | extern int inode_permission(struct inode *, int); |
2115 | extern int generic_permission(struct inode *, int, |
2116 | int (*check_acl)(struct inode *, int)); |
2117 | |
2118 | static inline bool execute_ok(struct inode *inode) |
2119 | { |
2120 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
2121 | } |
2122 | |
2123 | extern int get_write_access(struct inode *); |
2124 | extern int deny_write_access(struct file *); |
2125 | static inline void put_write_access(struct inode * inode) |
2126 | { |
2127 | atomic_dec(&inode->i_writecount); |
2128 | } |
2129 | static inline void allow_write_access(struct file *file) |
2130 | { |
2131 | if (file) |
2132 | atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
2133 | } |
2134 | extern int do_pipe_flags(int *, int); |
2135 | extern struct file *create_read_pipe(struct file *f, int flags); |
2136 | extern struct file *create_write_pipe(int flags); |
2137 | extern void free_write_pipe(struct file *); |
2138 | |
2139 | extern struct file *do_filp_open(int dfd, const char *pathname, |
2140 | int open_flag, int mode, int acc_mode); |
2141 | extern int may_open(struct path *, int, int); |
2142 | |
2143 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
2144 | extern struct file * open_exec(const char *); |
2145 | |
2146 | /* fs/dcache.c -- generic fs support functions */ |
2147 | extern int is_subdir(struct dentry *, struct dentry *); |
2148 | extern ino_t find_inode_number(struct dentry *, struct qstr *); |
2149 | |
2150 | #include <linux/err.h> |
2151 | |
2152 | /* needed for stackable file system support */ |
2153 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); |
2154 | |
2155 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); |
2156 | |
2157 | extern int inode_init_always(struct super_block *, struct inode *); |
2158 | extern void inode_init_once(struct inode *); |
2159 | extern void inode_add_to_lists(struct super_block *, struct inode *); |
2160 | extern void iput(struct inode *); |
2161 | extern struct inode * igrab(struct inode *); |
2162 | extern ino_t iunique(struct super_block *, ino_t); |
2163 | extern int inode_needs_sync(struct inode *inode); |
2164 | extern void generic_delete_inode(struct inode *inode); |
2165 | extern void generic_drop_inode(struct inode *inode); |
2166 | extern int generic_detach_inode(struct inode *inode); |
2167 | |
2168 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2169 | unsigned long hashval, int (*test)(struct inode *, void *), |
2170 | void *data); |
2171 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2172 | int (*test)(struct inode *, void *), void *data); |
2173 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
2174 | |
2175 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
2176 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
2177 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2178 | extern int insert_inode_locked(struct inode *); |
2179 | extern void unlock_new_inode(struct inode *); |
2180 | |
2181 | extern void __iget(struct inode * inode); |
2182 | extern void iget_failed(struct inode *); |
2183 | extern void clear_inode(struct inode *); |
2184 | extern void destroy_inode(struct inode *); |
2185 | extern void __destroy_inode(struct inode *); |
2186 | extern struct inode *new_inode(struct super_block *); |
2187 | extern int should_remove_suid(struct dentry *); |
2188 | extern int file_remove_suid(struct file *); |
2189 | |
2190 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
2191 | extern void remove_inode_hash(struct inode *); |
2192 | static inline void insert_inode_hash(struct inode *inode) { |
2193 | __insert_inode_hash(inode, inode->i_ino); |
2194 | } |
2195 | |
2196 | extern struct file * get_empty_filp(void); |
2197 | extern void file_move(struct file *f, struct list_head *list); |
2198 | extern void file_kill(struct file *f); |
2199 | #ifdef CONFIG_BLOCK |
2200 | struct bio; |
2201 | extern void submit_bio(int, struct bio *); |
2202 | extern int bdev_read_only(struct block_device *); |
2203 | #endif |
2204 | extern int set_blocksize(struct block_device *, int); |
2205 | extern int sb_set_blocksize(struct super_block *, int); |
2206 | extern int sb_min_blocksize(struct super_block *, int); |
2207 | |
2208 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
2209 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
2210 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); |
2211 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
2212 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
2213 | extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, |
2214 | loff_t *); |
2215 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
2216 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
2217 | unsigned long *, loff_t, loff_t *, size_t, size_t); |
2218 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, |
2219 | unsigned long, loff_t, loff_t *, size_t, ssize_t); |
2220 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
2221 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); |
2222 | extern int generic_segment_checks(const struct iovec *iov, |
2223 | unsigned long *nr_segs, size_t *count, int access_flags); |
2224 | |
2225 | /* fs/block_dev.c */ |
2226 | extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, |
2227 | unsigned long nr_segs, loff_t pos); |
2228 | |
2229 | /* fs/splice.c */ |
2230 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
2231 | struct pipe_inode_info *, size_t, unsigned int); |
2232 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
2233 | struct pipe_inode_info *, size_t, unsigned int); |
2234 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
2235 | struct file *, loff_t *, size_t, unsigned int); |
2236 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
2237 | struct file *out, loff_t *, size_t len, unsigned int flags); |
2238 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
2239 | size_t len, unsigned int flags); |
2240 | |
2241 | extern void |
2242 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
2243 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
2244 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); |
2245 | extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset, |
2246 | int origin); |
2247 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2248 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
2249 | |
2250 | #ifdef CONFIG_FS_XIP |
2251 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
2252 | loff_t *ppos); |
2253 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
2254 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
2255 | size_t len, loff_t *ppos); |
2256 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
2257 | #else |
2258 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
2259 | { |
2260 | return 0; |
2261 | } |
2262 | #endif |
2263 | |
2264 | #ifdef CONFIG_BLOCK |
2265 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
2266 | struct block_device *bdev, const struct iovec *iov, loff_t offset, |
2267 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
2268 | int lock_type); |
2269 | |
2270 | enum { |
2271 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ |
2272 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ |
2273 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ |
2274 | }; |
2275 | |
2276 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
2277 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
2278 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
2279 | dio_iodone_t end_io) |
2280 | { |
2281 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
2282 | nr_segs, get_block, end_io, DIO_LOCKING); |
2283 | } |
2284 | |
2285 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, |
2286 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
2287 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
2288 | dio_iodone_t end_io) |
2289 | { |
2290 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
2291 | nr_segs, get_block, end_io, DIO_NO_LOCKING); |
2292 | } |
2293 | |
2294 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, |
2295 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
2296 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
2297 | dio_iodone_t end_io) |
2298 | { |
2299 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
2300 | nr_segs, get_block, end_io, DIO_OWN_LOCKING); |
2301 | } |
2302 | #endif |
2303 | |
2304 | extern const struct file_operations generic_ro_fops; |
2305 | |
2306 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
2307 | |
2308 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); |
2309 | extern int vfs_follow_link(struct nameidata *, const char *); |
2310 | extern int page_readlink(struct dentry *, char __user *, int); |
2311 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
2312 | extern void page_put_link(struct dentry *, struct nameidata *, void *); |
2313 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
2314 | int nofs); |
2315 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
2316 | extern const struct inode_operations page_symlink_inode_operations; |
2317 | extern int generic_readlink(struct dentry *, char __user *, int); |
2318 | extern void generic_fillattr(struct inode *, struct kstat *); |
2319 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
2320 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
2321 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
2322 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
2323 | loff_t inode_get_bytes(struct inode *inode); |
2324 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
2325 | |
2326 | extern int vfs_readdir(struct file *, filldir_t, void *); |
2327 | |
2328 | extern int vfs_stat(char __user *, struct kstat *); |
2329 | extern int vfs_lstat(char __user *, struct kstat *); |
2330 | extern int vfs_fstat(unsigned int, struct kstat *); |
2331 | extern int vfs_fstatat(int , char __user *, struct kstat *, int); |
2332 | |
2333 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
2334 | unsigned long arg); |
2335 | extern int __generic_block_fiemap(struct inode *inode, |
2336 | struct fiemap_extent_info *fieinfo, u64 start, |
2337 | u64 len, get_block_t *get_block); |
2338 | extern int generic_block_fiemap(struct inode *inode, |
2339 | struct fiemap_extent_info *fieinfo, u64 start, |
2340 | u64 len, get_block_t *get_block); |
2341 | |
2342 | extern void get_filesystem(struct file_system_type *fs); |
2343 | extern void put_filesystem(struct file_system_type *fs); |
2344 | extern struct file_system_type *get_fs_type(const char *name); |
2345 | extern struct super_block *get_super(struct block_device *); |
2346 | extern struct super_block *get_active_super(struct block_device *bdev); |
2347 | extern struct super_block *user_get_super(dev_t); |
2348 | extern void drop_super(struct super_block *sb); |
2349 | |
2350 | extern int dcache_dir_open(struct inode *, struct file *); |
2351 | extern int dcache_dir_close(struct inode *, struct file *); |
2352 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
2353 | extern int dcache_readdir(struct file *, void *, filldir_t); |
2354 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
2355 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
2356 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
2357 | extern int simple_unlink(struct inode *, struct dentry *); |
2358 | extern int simple_rmdir(struct inode *, struct dentry *); |
2359 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
2360 | extern int simple_sync_file(struct file *, struct dentry *, int); |
2361 | extern int simple_empty(struct dentry *); |
2362 | extern int simple_readpage(struct file *file, struct page *page); |
2363 | extern int simple_prepare_write(struct file *file, struct page *page, |
2364 | unsigned offset, unsigned to); |
2365 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
2366 | loff_t pos, unsigned len, unsigned flags, |
2367 | struct page **pagep, void **fsdata); |
2368 | extern int simple_write_end(struct file *file, struct address_space *mapping, |
2369 | loff_t pos, unsigned len, unsigned copied, |
2370 | struct page *page, void *fsdata); |
2371 | |
2372 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); |
2373 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
2374 | extern const struct file_operations simple_dir_operations; |
2375 | extern const struct inode_operations simple_dir_inode_operations; |
2376 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
2377 | struct dentry *d_alloc_name(struct dentry *, const char *); |
2378 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); |
2379 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
2380 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
2381 | |
2382 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
2383 | loff_t *ppos, const void *from, size_t available); |
2384 | |
2385 | extern int simple_fsync(struct file *, struct dentry *, int); |
2386 | |
2387 | #ifdef CONFIG_MIGRATION |
2388 | extern int buffer_migrate_page(struct address_space *, |
2389 | struct page *, struct page *); |
2390 | #else |
2391 | #define buffer_migrate_page NULL |
2392 | #endif |
2393 | |
2394 | extern int inode_change_ok(const struct inode *, struct iattr *); |
2395 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
2396 | extern int __must_check inode_setattr(struct inode *, struct iattr *); |
2397 | |
2398 | extern void file_update_time(struct file *file); |
2399 | |
2400 | extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt); |
2401 | extern void save_mount_options(struct super_block *sb, char *options); |
2402 | extern void replace_mount_options(struct super_block *sb, char *options); |
2403 | |
2404 | static inline ino_t parent_ino(struct dentry *dentry) |
2405 | { |
2406 | ino_t res; |
2407 | |
2408 | spin_lock(&dentry->d_lock); |
2409 | res = dentry->d_parent->d_inode->i_ino; |
2410 | spin_unlock(&dentry->d_lock); |
2411 | return res; |
2412 | } |
2413 | |
2414 | /* Transaction based IO helpers */ |
2415 | |
2416 | /* |
2417 | * An argresp is stored in an allocated page and holds the |
2418 | * size of the argument or response, along with its content |
2419 | */ |
2420 | struct simple_transaction_argresp { |
2421 | ssize_t size; |
2422 | char data[0]; |
2423 | }; |
2424 | |
2425 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
2426 | |
2427 | char *simple_transaction_get(struct file *file, const char __user *buf, |
2428 | size_t size); |
2429 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
2430 | size_t size, loff_t *pos); |
2431 | int simple_transaction_release(struct inode *inode, struct file *file); |
2432 | |
2433 | void simple_transaction_set(struct file *file, size_t n); |
2434 | |
2435 | /* |
2436 | * simple attribute files |
2437 | * |
2438 | * These attributes behave similar to those in sysfs: |
2439 | * |
2440 | * Writing to an attribute immediately sets a value, an open file can be |
2441 | * written to multiple times. |
2442 | * |
2443 | * Reading from an attribute creates a buffer from the value that might get |
2444 | * read with multiple read calls. When the attribute has been read |
2445 | * completely, no further read calls are possible until the file is opened |
2446 | * again. |
2447 | * |
2448 | * All attributes contain a text representation of a numeric value |
2449 | * that are accessed with the get() and set() functions. |
2450 | */ |
2451 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
2452 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
2453 | { \ |
2454 | __simple_attr_check_format(__fmt, 0ull); \ |
2455 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
2456 | } \ |
2457 | static const struct file_operations __fops = { \ |
2458 | .owner = THIS_MODULE, \ |
2459 | .open = __fops ## _open, \ |
2460 | .release = simple_attr_release, \ |
2461 | .read = simple_attr_read, \ |
2462 | .write = simple_attr_write, \ |
2463 | }; |
2464 | |
2465 | static inline void __attribute__((format(printf, 1, 2))) |
2466 | __simple_attr_check_format(const char *fmt, ...) |
2467 | { |
2468 | /* don't do anything, just let the compiler check the arguments; */ |
2469 | } |
2470 | |
2471 | int simple_attr_open(struct inode *inode, struct file *file, |
2472 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
2473 | const char *fmt); |
2474 | int simple_attr_release(struct inode *inode, struct file *file); |
2475 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
2476 | size_t len, loff_t *ppos); |
2477 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
2478 | size_t len, loff_t *ppos); |
2479 | |
2480 | struct ctl_table; |
2481 | int proc_nr_files(struct ctl_table *table, int write, |
2482 | void __user *buffer, size_t *lenp, loff_t *ppos); |
2483 | |
2484 | int __init get_filesystem_list(char *buf); |
2485 | |
2486 | #endif /* __KERNEL__ */ |
2487 | #endif /* _LINUX_FS_H */ |
2488 |
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