Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
9 | #include <linux/limits.h> |
10 | #include <linux/ioctl.h> | |
7cc01581 | 11 | #include <linux/blk_types.h> |
b31d42a5 | 12 | #include <linux/types.h> |
1da177e4 LT |
13 | |
14 | /* | |
15 | * It's silly to have NR_OPEN bigger than NR_FILE, but you can change | |
16 | * the file limit at runtime and only root can increase the per-process | |
17 | * nr_file rlimit, so it's safe to set up a ridiculously high absolute | |
18 | * upper limit on files-per-process. | |
19 | * | |
20 | * Some programs (notably those using select()) may have to be | |
21 | * recompiled to take full advantage of the new limits.. | |
22 | */ | |
23 | ||
24 | /* Fixed constants first: */ | |
25 | #undef NR_OPEN | |
0ac1ee0b TG |
26 | #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ |
27 | #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ | |
1da177e4 LT |
28 | |
29 | #define BLOCK_SIZE_BITS 10 | |
30 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) | |
31 | ||
01bf466e DH |
32 | #define SEEK_SET 0 /* seek relative to beginning of file */ |
33 | #define SEEK_CUR 1 /* seek relative to current file position */ | |
34 | #define SEEK_END 2 /* seek relative to end of file */ | |
982d8165 JB |
35 | #define SEEK_DATA 3 /* seek to the next data */ |
36 | #define SEEK_HOLE 4 /* seek to the next hole */ | |
37 | #define SEEK_MAX SEEK_HOLE | |
01bf466e | 38 | |
367a51a3 | 39 | struct fstrim_range { |
3a3a1af3 LM |
40 | __u64 start; |
41 | __u64 len; | |
42 | __u64 minlen; | |
367a51a3 LC |
43 | }; |
44 | ||
1da177e4 LT |
45 | /* And dynamically-tunable limits and defaults: */ |
46 | struct files_stat_struct { | |
518de9b3 ED |
47 | unsigned long nr_files; /* read only */ |
48 | unsigned long nr_free_files; /* read only */ | |
49 | unsigned long max_files; /* tunable */ | |
1da177e4 | 50 | }; |
1da177e4 LT |
51 | |
52 | struct inodes_stat_t { | |
53 | int nr_inodes; | |
54 | int nr_unused; | |
9e7bf24b | 55 | int dummy[5]; /* padding for sysctl ABI compatibility */ |
1da177e4 | 56 | }; |
1da177e4 | 57 | |
1da177e4 LT |
58 | |
59 | #define NR_FILE 8192 /* this can well be larger on a larger system */ | |
60 | ||
8522ca58 AK |
61 | #define MAY_EXEC 0x00000001 |
62 | #define MAY_WRITE 0x00000002 | |
63 | #define MAY_READ 0x00000004 | |
64 | #define MAY_APPEND 0x00000008 | |
65 | #define MAY_ACCESS 0x00000010 | |
66 | #define MAY_OPEN 0x00000020 | |
67 | #define MAY_CHDIR 0x00000040 | |
68 | /* called from RCU mode, don't block */ | |
69 | #define MAY_NOT_BLOCK 0x00000080 | |
1da177e4 | 70 | |
55ec8217 PT |
71 | /* |
72 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond | |
73 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() | |
74 | */ | |
75 | ||
fc9161e5 | 76 | /* file is open for reading */ |
19adf9c5 | 77 | #define FMODE_READ ((__force fmode_t)0x1) |
fc9161e5 | 78 | /* file is open for writing */ |
19adf9c5 | 79 | #define FMODE_WRITE ((__force fmode_t)0x2) |
fc9161e5 | 80 | /* file is seekable */ |
19adf9c5 | 81 | #define FMODE_LSEEK ((__force fmode_t)0x4) |
55ec8217 | 82 | /* file can be accessed using pread */ |
19adf9c5 | 83 | #define FMODE_PREAD ((__force fmode_t)0x8) |
55ec8217 | 84 | /* file can be accessed using pwrite */ |
19adf9c5 | 85 | #define FMODE_PWRITE ((__force fmode_t)0x10) |
fc9161e5 | 86 | /* File is opened for execution with sys_execve / sys_uselib */ |
19adf9c5 | 87 | #define FMODE_EXEC ((__force fmode_t)0x20) |
fc9161e5 | 88 | /* File is opened with O_NDELAY (only set for block devices) */ |
19adf9c5 | 89 | #define FMODE_NDELAY ((__force fmode_t)0x40) |
fc9161e5 | 90 | /* File is opened with O_EXCL (only set for block devices) */ |
19adf9c5 | 91 | #define FMODE_EXCL ((__force fmode_t)0x80) |
fc9161e5 CH |
92 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
93 | (specialy hack for floppy.c) */ | |
19adf9c5 | 94 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
b500531e | 95 | |
4d4be482 CH |
96 | /* |
97 | * Don't update ctime and mtime. | |
98 | * | |
99 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll | |
100 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. | |
101 | */ | |
19adf9c5 | 102 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
4d4be482 | 103 | |
0141450f | 104 | /* Expect random access pattern */ |
19adf9c5 | 105 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
0141450f | 106 | |
4a3956c7 KH |
107 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
108 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) | |
109 | ||
1abf0c71 AV |
110 | /* File is opened with O_PATH; almost nothing can be done with it */ |
111 | #define FMODE_PATH ((__force fmode_t)0x4000) | |
112 | ||
ecf081d1 | 113 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
13bcbc00 | 114 | #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) |
ecf081d1 | 115 | |
48e70bc1 JA |
116 | /* |
117 | * The below are the various read and write types that we support. Some of | |
118 | * them include behavioral modifiers that send information down to the | |
119 | * block layer and IO scheduler. Terminology: | |
120 | * | |
121 | * The block layer uses device plugging to defer IO a little bit, in | |
122 | * the hope that we will see more IO very shortly. This increases | |
123 | * coalescing of adjacent IO and thus reduces the number of IOs we | |
124 | * have to send to the device. It also allows for better queuing, | |
125 | * if the IO isn't mergeable. If the caller is going to be waiting | |
126 | * for the IO, then he must ensure that the device is unplugged so | |
127 | * that the IO is dispatched to the driver. | |
128 | * | |
129 | * All IO is handled async in Linux. This is fine for background | |
130 | * writes, but for reads or writes that someone waits for completion | |
131 | * on, we want to notify the block layer and IO scheduler so that they | |
132 | * know about it. That allows them to make better scheduling | |
133 | * decisions. So when the below references 'sync' and 'async', it | |
134 | * is referencing this priority hint. | |
135 | * | |
136 | * With that in mind, the available types are: | |
137 | * | |
138 | * READ A normal read operation. Device will be plugged. | |
139 | * READ_SYNC A synchronous read. Device is not plugged, caller can | |
140 | * immediately wait on this read without caring about | |
141 | * unplugging. | |
142 | * READA Used for read-ahead operations. Lower priority, and the | |
7cc01581 | 143 | * block layer could (in theory) choose to ignore this |
48e70bc1 JA |
144 | * request if it runs into resource problems. |
145 | * WRITE A normal async write. Device will be plugged. | |
721a9602 | 146 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
48e70bc1 | 147 | * the hint that someone will be waiting on this IO |
721a9602 JA |
148 | * shortly. The write equivalent of READ_SYNC. |
149 | * WRITE_ODIRECT Special case write for O_DIRECT only. | |
4fed947c TH |
150 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
151 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on | |
152 | * non-volatile media on completion. | |
153 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded | |
154 | * by a cache flush and data is guaranteed to be on | |
155 | * non-volatile media on completion. | |
48e70bc1 JA |
156 | * |
157 | */ | |
7cc01581 TH |
158 | #define RW_MASK REQ_WRITE |
159 | #define RWA_MASK REQ_RAHEAD | |
7b6d91da CH |
160 | |
161 | #define READ 0 | |
7cc01581 TH |
162 | #define WRITE RW_MASK |
163 | #define READA RWA_MASK | |
7b6d91da | 164 | |
721a9602 | 165 | #define READ_SYNC (READ | REQ_SYNC) |
721a9602 JA |
166 | #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
167 | #define WRITE_ODIRECT (WRITE | REQ_SYNC) | |
721a9602 JA |
168 | #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
169 | #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) | |
170 | #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) | |
1da177e4 LT |
171 | |
172 | #define SEL_IN 1 | |
173 | #define SEL_OUT 2 | |
174 | #define SEL_EX 4 | |
175 | ||
176 | /* public flags for file_system_type */ | |
177 | #define FS_REQUIRES_DEV 1 | |
178 | #define FS_BINARY_MOUNTDATA 2 | |
79c0b2df | 179 | #define FS_HAS_SUBTYPE 4 |
1da177e4 | 180 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
349457cc MF |
181 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
182 | * during rename() internally. | |
183 | */ | |
184 | ||
1da177e4 LT |
185 | /* |
186 | * These are the fs-independent mount-flags: up to 32 flags are supported | |
187 | */ | |
188 | #define MS_RDONLY 1 /* Mount read-only */ | |
189 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |
190 | #define MS_NODEV 4 /* Disallow access to device special files */ | |
191 | #define MS_NOEXEC 8 /* Disallow program execution */ | |
192 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ | |
193 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ | |
194 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
195 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ | |
196 | #define MS_NOATIME 1024 /* Do not update access times. */ | |
197 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ | |
198 | #define MS_BIND 4096 | |
199 | #define MS_MOVE 8192 | |
200 | #define MS_REC 16384 | |
9b04c997 TT |
201 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
202 | MS_VERBOSE is deprecated. */ | |
203 | #define MS_SILENT 32768 | |
bf066c7d | 204 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
9676f0c6 | 205 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
07b20889 | 206 | #define MS_PRIVATE (1<<18) /* change to private */ |
a58b0eb8 | 207 | #define MS_SLAVE (1<<19) /* change to slave */ |
03e06e68 | 208 | #define MS_SHARED (1<<20) /* change to shared */ |
47ae32d6 | 209 | #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ |
8bf9725c | 210 | #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ |
7a224228 | 211 | #define MS_I_VERSION (1<<23) /* Update inode I_version field */ |
d0adde57 | 212 | #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ |
9e1f1de0 | 213 | #define MS_NOSEC (1<<28) |
7a4dec53 | 214 | #define MS_BORN (1<<29) |
1da177e4 LT |
215 | #define MS_ACTIVE (1<<30) |
216 | #define MS_NOUSER (1<<31) | |
217 | ||
218 | /* | |
219 | * Superblock flags that can be altered by MS_REMOUNT | |
220 | */ | |
08b9fe6b | 221 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) |
1da177e4 LT |
222 | |
223 | /* | |
224 | * Old magic mount flag and mask | |
225 | */ | |
226 | #define MS_MGC_VAL 0xC0ED0000 | |
227 | #define MS_MGC_MSK 0xffff0000 | |
228 | ||
229 | /* Inode flags - they have nothing to superblock flags now */ | |
230 | ||
231 | #define S_SYNC 1 /* Writes are synced at once */ | |
232 | #define S_NOATIME 2 /* Do not update access times */ | |
233 | #define S_APPEND 4 /* Append-only file */ | |
234 | #define S_IMMUTABLE 8 /* Immutable file */ | |
235 | #define S_DEAD 16 /* removed, but still open directory */ | |
236 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
237 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
238 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
239 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
240 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
196f5181 | 241 | #define S_IMA 1024 /* Inode has an associated IMA struct */ |
9875cf80 | 242 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
69b45732 | 243 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
1da177e4 LT |
244 | |
245 | /* | |
246 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
247 | * flags just means all the inodes inherit those flags by default. It might be | |
248 | * possible to override it selectively if you really wanted to with some | |
249 | * ioctl() that is not currently implemented. | |
250 | * | |
251 | * Exception: MS_RDONLY is always applied to the entire file system. | |
252 | * | |
253 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
254 | * with files in use. This means that all of the inodes will not have their | |
255 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
256 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
257 | */ | |
258 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) | |
259 | ||
260 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
261 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
262 | ((inode)->i_flags & S_SYNC)) | |
263 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
264 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
265 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
37756ced | 266 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
7a224228 | 267 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
1da177e4 LT |
268 | |
269 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
270 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
271 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
272 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
273 | ||
274 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
275 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
276 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
277 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
196f5181 | 278 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
9875cf80 | 279 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
69b45732 | 280 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
1da177e4 LT |
281 | |
282 | /* the read-only stuff doesn't really belong here, but any other place is | |
283 | probably as bad and I don't want to create yet another include file. */ | |
284 | ||
285 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ | |
286 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ | |
287 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ | |
288 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ | |
289 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ | |
290 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ | |
291 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ | |
292 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ | |
293 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ | |
294 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ | |
295 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ | |
296 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ | |
297 | #if 0 | |
298 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ | |
299 | ||
300 | /* Some people are morons. Do not use sizeof! */ | |
301 | ||
302 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ | |
303 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ | |
304 | /* This was here just to show that the number is taken - | |
305 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ | |
306 | #endif | |
307 | /* A jump here: 108-111 have been used for various private purposes. */ | |
308 | #define BLKBSZGET _IOR(0x12,112,size_t) | |
309 | #define BLKBSZSET _IOW(0x12,113,size_t) | |
310 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
2056a782 JA |
311 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
312 | #define BLKTRACESTART _IO(0x12,116) | |
313 | #define BLKTRACESTOP _IO(0x12,117) | |
314 | #define BLKTRACETEARDOWN _IO(0x12,118) | |
d30a2605 | 315 | #define BLKDISCARD _IO(0x12,119) |
ac481c20 MP |
316 | #define BLKIOMIN _IO(0x12,120) |
317 | #define BLKIOOPT _IO(0x12,121) | |
318 | #define BLKALIGNOFF _IO(0x12,122) | |
319 | #define BLKPBSZGET _IO(0x12,123) | |
98262f27 | 320 | #define BLKDISCARDZEROES _IO(0x12,124) |
8d57a98c | 321 | #define BLKSECDISCARD _IO(0x12,125) |
ef00f59c | 322 | #define BLKROTATIONAL _IO(0x12,126) |
1da177e4 LT |
323 | |
324 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ | |
325 | #define FIBMAP _IO(0x00,1) /* bmap access */ | |
326 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ | |
fcccf502 TS |
327 | #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ |
328 | #define FITHAW _IOWR('X', 120, int) /* Thaw */ | |
367a51a3 | 329 | #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ |
1da177e4 | 330 | |
36695673 DH |
331 | #define FS_IOC_GETFLAGS _IOR('f', 1, long) |
332 | #define FS_IOC_SETFLAGS _IOW('f', 2, long) | |
333 | #define FS_IOC_GETVERSION _IOR('v', 1, long) | |
334 | #define FS_IOC_SETVERSION _IOW('v', 2, long) | |
c4b929b8 | 335 | #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) |
36695673 DH |
336 | #define FS_IOC32_GETFLAGS _IOR('f', 1, int) |
337 | #define FS_IOC32_SETFLAGS _IOW('f', 2, int) | |
338 | #define FS_IOC32_GETVERSION _IOR('v', 1, int) | |
339 | #define FS_IOC32_SETVERSION _IOW('v', 2, int) | |
340 | ||
341 | /* | |
342 | * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) | |
343 | */ | |
344 | #define FS_SECRM_FL 0x00000001 /* Secure deletion */ | |
345 | #define FS_UNRM_FL 0x00000002 /* Undelete */ | |
346 | #define FS_COMPR_FL 0x00000004 /* Compress file */ | |
347 | #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ | |
348 | #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
349 | #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ | |
350 | #define FS_NODUMP_FL 0x00000040 /* do not dump file */ | |
351 | #define FS_NOATIME_FL 0x00000080 /* do not update atime */ | |
352 | /* Reserved for compression usage... */ | |
353 | #define FS_DIRTY_FL 0x00000100 | |
354 | #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
355 | #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ | |
356 | #define FS_ECOMPR_FL 0x00000800 /* Compression error */ | |
357 | /* End compression flags --- maybe not all used */ | |
358 | #define FS_BTREE_FL 0x00001000 /* btree format dir */ | |
359 | #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ | |
360 | #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ | |
361 | #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ | |
362 | #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
363 | #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
364 | #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
128e5eba SW |
365 | #define FS_EXTENT_FL 0x00080000 /* Extents */ |
366 | #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ | |
32471f6e | 367 | #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ |
36695673 DH |
368 | #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
369 | ||
370 | #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ | |
371 | #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ | |
372 | ||
373 | ||
e46e4903 AM |
374 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
375 | #define SYNC_FILE_RANGE_WRITE 2 | |
376 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 | |
377 | ||
1da177e4 LT |
378 | #ifdef __KERNEL__ |
379 | ||
380 | #include <linux/linkage.h> | |
381 | #include <linux/wait.h> | |
1da177e4 LT |
382 | #include <linux/kdev_t.h> |
383 | #include <linux/dcache.h> | |
3f8206d4 | 384 | #include <linux/path.h> |
1da177e4 LT |
385 | #include <linux/stat.h> |
386 | #include <linux/cache.h> | |
1da177e4 LT |
387 | #include <linux/list.h> |
388 | #include <linux/radix-tree.h> | |
389 | #include <linux/prio_tree.h> | |
390 | #include <linux/init.h> | |
914e2637 | 391 | #include <linux/pid.h> |
187f1882 | 392 | #include <linux/bug.h> |
1b1dcc1b | 393 | #include <linux/mutex.h> |
3bd858ab | 394 | #include <linux/capability.h> |
6188e10d | 395 | #include <linux/semaphore.h> |
c4b929b8 | 396 | #include <linux/fiemap.h> |
ceb5bdc2 | 397 | #include <linux/rculist_bl.h> |
07b8ce1e | 398 | #include <linux/atomic.h> |
83aeeada | 399 | #include <linux/shrinker.h> |
c1aab02d | 400 | #include <linux/migrate_mode.h> |
1da177e4 | 401 | |
1da177e4 LT |
402 | #include <asm/byteorder.h> |
403 | ||
a5694255 | 404 | struct export_operations; |
a885c8c4 | 405 | struct hd_geometry; |
1da177e4 LT |
406 | struct iovec; |
407 | struct nameidata; | |
92198f7e | 408 | struct kiocb; |
57cc7215 | 409 | struct kobject; |
1da177e4 LT |
410 | struct pipe_inode_info; |
411 | struct poll_table_struct; | |
412 | struct kstatfs; | |
413 | struct vm_area_struct; | |
414 | struct vfsmount; | |
745ca247 | 415 | struct cred; |
1da177e4 | 416 | |
74bf17cf | 417 | extern void __init inode_init(void); |
1da177e4 | 418 | extern void __init inode_init_early(void); |
1da177e4 LT |
419 | extern void __init files_init(unsigned long); |
420 | ||
dded4f4d | 421 | extern struct files_stat_struct files_stat; |
518de9b3 | 422 | extern unsigned long get_max_files(void); |
dded4f4d JE |
423 | extern int sysctl_nr_open; |
424 | extern struct inodes_stat_t inodes_stat; | |
425 | extern int leases_enable, lease_break_time; | |
dded4f4d | 426 | |
1da177e4 LT |
427 | struct buffer_head; |
428 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
429 | struct buffer_head *bh_result, int create); | |
92198f7e | 430 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
40e2e973 CH |
431 | ssize_t bytes, void *private, int ret, |
432 | bool is_async); | |
1da177e4 LT |
433 | |
434 | /* | |
435 | * Attribute flags. These should be or-ed together to figure out what | |
436 | * has been changed! | |
437 | */ | |
9767d749 MS |
438 | #define ATTR_MODE (1 << 0) |
439 | #define ATTR_UID (1 << 1) | |
440 | #define ATTR_GID (1 << 2) | |
441 | #define ATTR_SIZE (1 << 3) | |
442 | #define ATTR_ATIME (1 << 4) | |
443 | #define ATTR_MTIME (1 << 5) | |
444 | #define ATTR_CTIME (1 << 6) | |
445 | #define ATTR_ATIME_SET (1 << 7) | |
446 | #define ATTR_MTIME_SET (1 << 8) | |
447 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
448 | #define ATTR_ATTR_FLAG (1 << 10) | |
449 | #define ATTR_KILL_SUID (1 << 11) | |
450 | #define ATTR_KILL_SGID (1 << 12) | |
451 | #define ATTR_FILE (1 << 13) | |
452 | #define ATTR_KILL_PRIV (1 << 14) | |
453 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
454 | #define ATTR_TIMES_SET (1 << 16) | |
1da177e4 LT |
455 | |
456 | /* | |
457 | * This is the Inode Attributes structure, used for notify_change(). It | |
458 | * uses the above definitions as flags, to know which values have changed. | |
459 | * Also, in this manner, a Filesystem can look at only the values it cares | |
460 | * about. Basically, these are the attributes that the VFS layer can | |
461 | * request to change from the FS layer. | |
462 | * | |
463 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
464 | */ | |
465 | struct iattr { | |
466 | unsigned int ia_valid; | |
467 | umode_t ia_mode; | |
468 | uid_t ia_uid; | |
469 | gid_t ia_gid; | |
470 | loff_t ia_size; | |
471 | struct timespec ia_atime; | |
472 | struct timespec ia_mtime; | |
473 | struct timespec ia_ctime; | |
cc4e69de MS |
474 | |
475 | /* | |
25985edc | 476 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
477 | * implement an ftruncate() like method. NOTE: filesystem should |
478 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
479 | */ | |
480 | struct file *ia_file; | |
1da177e4 LT |
481 | }; |
482 | ||
1da177e4 LT |
483 | /* |
484 | * Includes for diskquotas. | |
485 | */ | |
486 | #include <linux/quota.h> | |
487 | ||
994fc28c ZB |
488 | /** |
489 | * enum positive_aop_returns - aop return codes with specific semantics | |
490 | * | |
491 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
492 | * completed, that the page is still locked, and | |
493 | * should be considered active. The VM uses this hint | |
494 | * to return the page to the active list -- it won't | |
495 | * be a candidate for writeback again in the near | |
496 | * future. Other callers must be careful to unlock | |
497 | * the page if they get this return. Returned by | |
498 | * writepage(); | |
499 | * | |
500 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
501 | * unlocked it and the page might have been truncated. | |
502 | * The caller should back up to acquiring a new page and | |
503 | * trying again. The aop will be taking reasonable | |
504 | * precautions not to livelock. If the caller held a page | |
505 | * reference, it should drop it before retrying. Returned | |
55144768 | 506 | * by readpage(). |
994fc28c ZB |
507 | * |
508 | * address_space_operation functions return these large constants to indicate | |
509 | * special semantics to the caller. These are much larger than the bytes in a | |
510 | * page to allow for functions that return the number of bytes operated on in a | |
511 | * given page. | |
512 | */ | |
513 | ||
514 | enum positive_aop_returns { | |
515 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
516 | AOP_TRUNCATED_PAGE = 0x80001, | |
517 | }; | |
518 | ||
afddba49 | 519 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
89e10787 | 520 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
54566b2c NP |
521 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
522 | * helper code (eg buffer layer) | |
523 | * to clear GFP_FS from alloc */ | |
afddba49 | 524 | |
1da177e4 LT |
525 | /* |
526 | * oh the beauties of C type declarations. | |
527 | */ | |
528 | struct page; | |
529 | struct address_space; | |
530 | struct writeback_control; | |
1da177e4 | 531 | |
2f718ffc NP |
532 | struct iov_iter { |
533 | const struct iovec *iov; | |
534 | unsigned long nr_segs; | |
535 | size_t iov_offset; | |
536 | size_t count; | |
537 | }; | |
538 | ||
539 | size_t iov_iter_copy_from_user_atomic(struct page *page, | |
540 | struct iov_iter *i, unsigned long offset, size_t bytes); | |
541 | size_t iov_iter_copy_from_user(struct page *page, | |
542 | struct iov_iter *i, unsigned long offset, size_t bytes); | |
543 | void iov_iter_advance(struct iov_iter *i, size_t bytes); | |
afddba49 | 544 | int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); |
2f718ffc NP |
545 | size_t iov_iter_single_seg_count(struct iov_iter *i); |
546 | ||
547 | static inline void iov_iter_init(struct iov_iter *i, | |
548 | const struct iovec *iov, unsigned long nr_segs, | |
549 | size_t count, size_t written) | |
550 | { | |
551 | i->iov = iov; | |
552 | i->nr_segs = nr_segs; | |
553 | i->iov_offset = 0; | |
554 | i->count = count + written; | |
555 | ||
556 | iov_iter_advance(i, written); | |
557 | } | |
558 | ||
559 | static inline size_t iov_iter_count(struct iov_iter *i) | |
560 | { | |
561 | return i->count; | |
562 | } | |
563 | ||
8ab22b9a HH |
564 | /* |
565 | * "descriptor" for what we're up to with a read. | |
566 | * This allows us to use the same read code yet | |
567 | * have multiple different users of the data that | |
568 | * we read from a file. | |
569 | * | |
570 | * The simplest case just copies the data to user | |
571 | * mode. | |
572 | */ | |
573 | typedef struct { | |
574 | size_t written; | |
575 | size_t count; | |
576 | union { | |
577 | char __user *buf; | |
578 | void *data; | |
579 | } arg; | |
580 | int error; | |
581 | } read_descriptor_t; | |
582 | ||
583 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
584 | unsigned long, unsigned long); | |
2f718ffc | 585 | |
1da177e4 LT |
586 | struct address_space_operations { |
587 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
588 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
589 | |
590 | /* Write back some dirty pages from this mapping. */ | |
591 | int (*writepages)(struct address_space *, struct writeback_control *); | |
592 | ||
4741c9fd | 593 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
594 | int (*set_page_dirty)(struct page *page); |
595 | ||
596 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
597 | struct list_head *pages, unsigned nr_pages); | |
598 | ||
afddba49 NP |
599 | int (*write_begin)(struct file *, struct address_space *mapping, |
600 | loff_t pos, unsigned len, unsigned flags, | |
601 | struct page **pagep, void **fsdata); | |
602 | int (*write_end)(struct file *, struct address_space *mapping, | |
603 | loff_t pos, unsigned len, unsigned copied, | |
604 | struct page *page, void *fsdata); | |
605 | ||
1da177e4 LT |
606 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
607 | sector_t (*bmap)(struct address_space *, sector_t); | |
2ff28e22 | 608 | void (*invalidatepage) (struct page *, unsigned long); |
27496a8c | 609 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 610 | void (*freepage)(struct page *); |
1da177e4 LT |
611 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
612 | loff_t offset, unsigned long nr_segs); | |
70688e4d NP |
613 | int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
614 | void **, unsigned long *); | |
b969c4ab MG |
615 | /* |
616 | * migrate the contents of a page to the specified target. If sync | |
617 | * is false, it must not block. | |
618 | */ | |
2d1db3b1 | 619 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 620 | struct page *, struct page *, enum migrate_mode); |
e3db7691 | 621 | int (*launder_page) (struct page *); |
8ab22b9a HH |
622 | int (*is_partially_uptodate) (struct page *, read_descriptor_t *, |
623 | unsigned long); | |
25718736 | 624 | int (*error_remove_page)(struct address_space *, struct page *); |
1da177e4 LT |
625 | }; |
626 | ||
7dcda1c9 JA |
627 | extern const struct address_space_operations empty_aops; |
628 | ||
afddba49 NP |
629 | /* |
630 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
631 | * to write into the pagecache. | |
632 | */ | |
633 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
634 | loff_t pos, unsigned len, unsigned flags, | |
635 | struct page **pagep, void **fsdata); | |
636 | ||
637 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
638 | loff_t pos, unsigned len, unsigned copied, | |
639 | struct page *page, void *fsdata); | |
640 | ||
1da177e4 LT |
641 | struct backing_dev_info; |
642 | struct address_space { | |
643 | struct inode *host; /* owner: inode, block_device */ | |
644 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
19fd6231 | 645 | spinlock_t tree_lock; /* and lock protecting it */ |
1da177e4 LT |
646 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
647 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ | |
648 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ | |
3d48ae45 | 649 | struct mutex i_mmap_mutex; /* protect tree, count, list */ |
08142579 | 650 | /* Protected by tree_lock together with the radix tree */ |
1da177e4 LT |
651 | unsigned long nrpages; /* number of total pages */ |
652 | pgoff_t writeback_index;/* writeback starts here */ | |
f5e54d6e | 653 | const struct address_space_operations *a_ops; /* methods */ |
1da177e4 LT |
654 | unsigned long flags; /* error bits/gfp mask */ |
655 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ | |
656 | spinlock_t private_lock; /* for use by the address_space */ | |
657 | struct list_head private_list; /* ditto */ | |
658 | struct address_space *assoc_mapping; /* ditto */ | |
659 | } __attribute__((aligned(sizeof(long)))); | |
660 | /* | |
661 | * On most architectures that alignment is already the case; but | |
25985edc | 662 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
663 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
664 | */ | |
87192a2a | 665 | struct request_queue; |
1da177e4 LT |
666 | |
667 | struct block_device { | |
668 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 669 | int bd_openers; |
1da177e4 | 670 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 671 | struct super_block * bd_super; |
c039e313 | 672 | struct mutex bd_mutex; /* open/close mutex */ |
1da177e4 | 673 | struct list_head bd_inodes; |
6b4517a7 | 674 | void * bd_claiming; |
1da177e4 LT |
675 | void * bd_holder; |
676 | int bd_holders; | |
77ea887e | 677 | bool bd_write_holder; |
641dc636 | 678 | #ifdef CONFIG_SYSFS |
49731baa | 679 | struct list_head bd_holder_disks; |
641dc636 | 680 | #endif |
1da177e4 LT |
681 | struct block_device * bd_contains; |
682 | unsigned bd_block_size; | |
683 | struct hd_struct * bd_part; | |
684 | /* number of times partitions within this device have been opened. */ | |
685 | unsigned bd_part_count; | |
686 | int bd_invalidated; | |
687 | struct gendisk * bd_disk; | |
87192a2a | 688 | struct request_queue * bd_queue; |
1da177e4 | 689 | struct list_head bd_list; |
1da177e4 LT |
690 | /* |
691 | * Private data. You must have bd_claim'ed the block_device | |
692 | * to use this. NOTE: bd_claim allows an owner to claim | |
693 | * the same device multiple times, the owner must take special | |
694 | * care to not mess up bd_private for that case. | |
695 | */ | |
696 | unsigned long bd_private; | |
fcccf502 TS |
697 | |
698 | /* The counter of freeze processes */ | |
699 | int bd_fsfreeze_count; | |
700 | /* Mutex for freeze */ | |
701 | struct mutex bd_fsfreeze_mutex; | |
1da177e4 LT |
702 | }; |
703 | ||
704 | /* | |
705 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
706 | * radix trees | |
707 | */ | |
708 | #define PAGECACHE_TAG_DIRTY 0 | |
709 | #define PAGECACHE_TAG_WRITEBACK 1 | |
f446daae | 710 | #define PAGECACHE_TAG_TOWRITE 2 |
1da177e4 LT |
711 | |
712 | int mapping_tagged(struct address_space *mapping, int tag); | |
713 | ||
714 | /* | |
715 | * Might pages of this file be mapped into userspace? | |
716 | */ | |
717 | static inline int mapping_mapped(struct address_space *mapping) | |
718 | { | |
719 | return !prio_tree_empty(&mapping->i_mmap) || | |
720 | !list_empty(&mapping->i_mmap_nonlinear); | |
721 | } | |
722 | ||
723 | /* | |
724 | * Might pages of this file have been modified in userspace? | |
725 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
726 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
727 | * writing i.e. vma may be mprotected writable even if now readonly. | |
728 | */ | |
729 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
730 | { | |
731 | return mapping->i_mmap_writable != 0; | |
732 | } | |
733 | ||
734 | /* | |
735 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
736 | */ | |
737 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
738 | #include <linux/seqlock.h> | |
739 | #define __NEED_I_SIZE_ORDERED | |
740 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
741 | #else | |
742 | #define i_size_ordered_init(inode) do { } while (0) | |
743 | #endif | |
744 | ||
f19d4a8f AV |
745 | struct posix_acl; |
746 | #define ACL_NOT_CACHED ((void *)(-1)) | |
747 | ||
3ddcd056 LT |
748 | #define IOP_FASTPERM 0x0001 |
749 | #define IOP_LOOKUP 0x0002 | |
750 | #define IOP_NOFOLLOW 0x0004 | |
751 | ||
752 | /* | |
753 | * Keep mostly read-only and often accessed (especially for | |
754 | * the RCU path lookup and 'stat' data) fields at the beginning | |
755 | * of the 'struct inode' | |
756 | */ | |
1da177e4 | 757 | struct inode { |
44a7d7a8 | 758 | umode_t i_mode; |
3ddcd056 | 759 | unsigned short i_opflags; |
44a7d7a8 NP |
760 | uid_t i_uid; |
761 | gid_t i_gid; | |
3ddcd056 LT |
762 | unsigned int i_flags; |
763 | ||
764 | #ifdef CONFIG_FS_POSIX_ACL | |
765 | struct posix_acl *i_acl; | |
766 | struct posix_acl *i_default_acl; | |
767 | #endif | |
768 | ||
44a7d7a8 NP |
769 | const struct inode_operations *i_op; |
770 | struct super_block *i_sb; | |
3ddcd056 | 771 | struct address_space *i_mapping; |
44a7d7a8 | 772 | |
13e12d14 LT |
773 | #ifdef CONFIG_SECURITY |
774 | void *i_security; | |
775 | #endif | |
44a7d7a8 | 776 | |
3ddcd056 LT |
777 | /* Stat data, not accessed from path walking */ |
778 | unsigned long i_ino; | |
a78ef704 MS |
779 | /* |
780 | * Filesystems may only read i_nlink directly. They shall use the | |
781 | * following functions for modification: | |
782 | * | |
783 | * (set|clear|inc|drop)_nlink | |
784 | * inode_(inc|dec)_link_count | |
785 | */ | |
786 | union { | |
787 | const unsigned int i_nlink; | |
788 | unsigned int __i_nlink; | |
789 | }; | |
3ddcd056 | 790 | dev_t i_rdev; |
3ddcd056 LT |
791 | struct timespec i_atime; |
792 | struct timespec i_mtime; | |
793 | struct timespec i_ctime; | |
6cdbb0ef TT |
794 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
795 | unsigned short i_bytes; | |
3ddcd056 | 796 | blkcnt_t i_blocks; |
6cdbb0ef | 797 | loff_t i_size; |
3ddcd056 LT |
798 | |
799 | #ifdef __NEED_I_SIZE_ORDERED | |
800 | seqcount_t i_size_seqcount; | |
801 | #endif | |
802 | ||
803 | /* Misc */ | |
804 | unsigned long i_state; | |
3ddcd056 | 805 | struct mutex i_mutex; |
13e12d14 | 806 | |
44a7d7a8 NP |
807 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
808 | ||
1da177e4 | 809 | struct hlist_node i_hash; |
7ccf19a8 NP |
810 | struct list_head i_wb_list; /* backing dev IO list */ |
811 | struct list_head i_lru; /* inode LRU list */ | |
1da177e4 | 812 | struct list_head i_sb_list; |
fa0d7e3d NP |
813 | union { |
814 | struct list_head i_dentry; | |
815 | struct rcu_head i_rcu; | |
816 | }; | |
1da177e4 | 817 | atomic_t i_count; |
6cdbb0ef | 818 | unsigned int i_blkbits; |
7a224228 | 819 | u64 i_version; |
bd5fe6c5 | 820 | atomic_t i_dio_count; |
6cdbb0ef | 821 | atomic_t i_writecount; |
99ac48f5 | 822 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
1da177e4 | 823 | struct file_lock *i_flock; |
1da177e4 LT |
824 | struct address_space i_data; |
825 | #ifdef CONFIG_QUOTA | |
826 | struct dquot *i_dquot[MAXQUOTAS]; | |
827 | #endif | |
1da177e4 | 828 | struct list_head i_devices; |
4c154168 TT |
829 | union { |
830 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 831 | struct block_device *i_bdev; |
577c4eb0 | 832 | struct cdev *i_cdev; |
4c154168 | 833 | }; |
1da177e4 LT |
834 | |
835 | __u32 i_generation; | |
836 | ||
3be25f49 EP |
837 | #ifdef CONFIG_FSNOTIFY |
838 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
e61ce867 | 839 | struct hlist_head i_fsnotify_marks; |
0eeca283 RL |
840 | #endif |
841 | ||
a178d202 | 842 | #ifdef CONFIG_IMA |
a68a27b6 | 843 | atomic_t i_readcount; /* struct files open RO */ |
a178d202 | 844 | #endif |
8e18e294 | 845 | void *i_private; /* fs or device private pointer */ |
1da177e4 LT |
846 | }; |
847 | ||
1d3382cb AV |
848 | static inline int inode_unhashed(struct inode *inode) |
849 | { | |
850 | return hlist_unhashed(&inode->i_hash); | |
851 | } | |
852 | ||
f2eace23 IM |
853 | /* |
854 | * inode->i_mutex nesting subclasses for the lock validator: | |
855 | * | |
856 | * 0: the object of the current VFS operation | |
857 | * 1: parent | |
858 | * 2: child/target | |
859 | * 3: quota file | |
860 | * | |
861 | * The locking order between these classes is | |
4df46240 | 862 | * parent -> child -> normal -> xattr -> quota |
f2eace23 IM |
863 | */ |
864 | enum inode_i_mutex_lock_class | |
865 | { | |
866 | I_MUTEX_NORMAL, | |
867 | I_MUTEX_PARENT, | |
868 | I_MUTEX_CHILD, | |
4df46240 | 869 | I_MUTEX_XATTR, |
f2eace23 IM |
870 | I_MUTEX_QUOTA |
871 | }; | |
872 | ||
1da177e4 LT |
873 | /* |
874 | * NOTE: in a 32bit arch with a preemptable kernel and | |
875 | * an UP compile the i_size_read/write must be atomic | |
876 | * with respect to the local cpu (unlike with preempt disabled), | |
877 | * but they don't need to be atomic with respect to other cpus like in | |
878 | * true SMP (so they need either to either locally disable irq around | |
879 | * the read or for example on x86 they can be still implemented as a | |
880 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
881 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
882 | */ | |
48ed214d | 883 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
884 | { |
885 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
886 | loff_t i_size; | |
887 | unsigned int seq; | |
888 | ||
889 | do { | |
890 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
891 | i_size = inode->i_size; | |
892 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
893 | return i_size; | |
894 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
895 | loff_t i_size; | |
896 | ||
897 | preempt_disable(); | |
898 | i_size = inode->i_size; | |
899 | preempt_enable(); | |
900 | return i_size; | |
901 | #else | |
902 | return inode->i_size; | |
903 | #endif | |
904 | } | |
905 | ||
7762f5a0 MS |
906 | /* |
907 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
908 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
909 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
910 | */ | |
1da177e4 LT |
911 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
912 | { | |
913 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
914 | write_seqcount_begin(&inode->i_size_seqcount); | |
915 | inode->i_size = i_size; | |
916 | write_seqcount_end(&inode->i_size_seqcount); | |
917 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
918 | preempt_disable(); | |
919 | inode->i_size = i_size; | |
920 | preempt_enable(); | |
921 | #else | |
922 | inode->i_size = i_size; | |
923 | #endif | |
924 | } | |
925 | ||
48ed214d | 926 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
927 | { |
928 | return MINOR(inode->i_rdev); | |
929 | } | |
930 | ||
48ed214d | 931 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
932 | { |
933 | return MAJOR(inode->i_rdev); | |
934 | } | |
935 | ||
936 | extern struct block_device *I_BDEV(struct inode *inode); | |
937 | ||
938 | struct fown_struct { | |
939 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
940 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
941 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
1da177e4 | 942 | uid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
943 | int signum; /* posix.1b rt signal to be delivered on IO */ |
944 | }; | |
945 | ||
946 | /* | |
947 | * Track a single file's readahead state | |
948 | */ | |
949 | struct file_ra_state { | |
937085aa FW |
950 | pgoff_t start; /* where readahead started */ |
951 | unsigned int size; /* # of readahead pages */ | |
952 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 953 | there are only # of pages ahead */ |
5ce1110b | 954 | |
937085aa | 955 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 956 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 957 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 958 | }; |
1da177e4 | 959 | |
5ce1110b FW |
960 | /* |
961 | * Check if @index falls in the readahead windows. | |
962 | */ | |
963 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
964 | { | |
f9acc8c7 FW |
965 | return (index >= ra->start && |
966 | index < ra->start + ra->size); | |
5ce1110b FW |
967 | } |
968 | ||
ad775f5a DH |
969 | #define FILE_MNT_WRITE_TAKEN 1 |
970 | #define FILE_MNT_WRITE_RELEASED 2 | |
971 | ||
1da177e4 | 972 | struct file { |
2f512016 ED |
973 | /* |
974 | * fu_list becomes invalid after file_free is called and queued via | |
975 | * fu_rcuhead for RCU freeing | |
976 | */ | |
977 | union { | |
978 | struct list_head fu_list; | |
979 | struct rcu_head fu_rcuhead; | |
980 | } f_u; | |
0f7fc9e4 JJS |
981 | struct path f_path; |
982 | #define f_dentry f_path.dentry | |
983 | #define f_vfsmnt f_path.mnt | |
99ac48f5 | 984 | const struct file_operations *f_op; |
ef3d0fd2 AK |
985 | |
986 | /* | |
987 | * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR. | |
988 | * Must not be taken from IRQ context. | |
989 | */ | |
990 | spinlock_t f_lock; | |
6416ccb7 NP |
991 | #ifdef CONFIG_SMP |
992 | int f_sb_list_cpu; | |
993 | #endif | |
516e0cc5 | 994 | atomic_long_t f_count; |
1da177e4 | 995 | unsigned int f_flags; |
aeb5d727 | 996 | fmode_t f_mode; |
1da177e4 LT |
997 | loff_t f_pos; |
998 | struct fown_struct f_owner; | |
d76b0d9b | 999 | const struct cred *f_cred; |
1da177e4 LT |
1000 | struct file_ra_state f_ra; |
1001 | ||
2b47c361 | 1002 | u64 f_version; |
50462062 | 1003 | #ifdef CONFIG_SECURITY |
1da177e4 | 1004 | void *f_security; |
50462062 | 1005 | #endif |
1da177e4 LT |
1006 | /* needed for tty driver, and maybe others */ |
1007 | void *private_data; | |
1008 | ||
1009 | #ifdef CONFIG_EPOLL | |
1010 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
1011 | struct list_head f_ep_links; | |
28d82dc1 | 1012 | struct list_head f_tfile_llink; |
1da177e4 LT |
1013 | #endif /* #ifdef CONFIG_EPOLL */ |
1014 | struct address_space *f_mapping; | |
ad775f5a DH |
1015 | #ifdef CONFIG_DEBUG_WRITECOUNT |
1016 | unsigned long f_mnt_write_state; | |
1017 | #endif | |
1da177e4 | 1018 | }; |
1da177e4 | 1019 | |
990d6c2d AK |
1020 | struct file_handle { |
1021 | __u32 handle_bytes; | |
1022 | int handle_type; | |
1023 | /* file identifier */ | |
1024 | unsigned char f_handle[0]; | |
1025 | }; | |
1026 | ||
516e0cc5 | 1027 | #define get_file(x) atomic_long_inc(&(x)->f_count) |
d7065da0 | 1028 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
516e0cc5 | 1029 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 | 1030 | |
ad775f5a DH |
1031 | #ifdef CONFIG_DEBUG_WRITECOUNT |
1032 | static inline void file_take_write(struct file *f) | |
1033 | { | |
1034 | WARN_ON(f->f_mnt_write_state != 0); | |
1035 | f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; | |
1036 | } | |
1037 | static inline void file_release_write(struct file *f) | |
1038 | { | |
1039 | f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; | |
1040 | } | |
1041 | static inline void file_reset_write(struct file *f) | |
1042 | { | |
1043 | f->f_mnt_write_state = 0; | |
1044 | } | |
1045 | static inline void file_check_state(struct file *f) | |
1046 | { | |
1047 | /* | |
1048 | * At this point, either both or neither of these bits | |
1049 | * should be set. | |
1050 | */ | |
1051 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); | |
1052 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); | |
1053 | } | |
1054 | static inline int file_check_writeable(struct file *f) | |
1055 | { | |
1056 | if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) | |
1057 | return 0; | |
1058 | printk(KERN_WARNING "writeable file with no " | |
1059 | "mnt_want_write()\n"); | |
1060 | WARN_ON(1); | |
1061 | return -EINVAL; | |
1062 | } | |
1063 | #else /* !CONFIG_DEBUG_WRITECOUNT */ | |
1064 | static inline void file_take_write(struct file *filp) {} | |
1065 | static inline void file_release_write(struct file *filp) {} | |
1066 | static inline void file_reset_write(struct file *filp) {} | |
1067 | static inline void file_check_state(struct file *filp) {} | |
1068 | static inline int file_check_writeable(struct file *filp) | |
1069 | { | |
1070 | return 0; | |
1071 | } | |
1072 | #endif /* CONFIG_DEBUG_WRITECOUNT */ | |
1073 | ||
1da177e4 LT |
1074 | #define MAX_NON_LFS ((1UL<<31) - 1) |
1075 | ||
1076 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
1077 | limits, otherwise bad things can happen in VM. */ | |
1078 | #if BITS_PER_LONG==32 | |
1079 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) | |
1080 | #elif BITS_PER_LONG==64 | |
1081 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL | |
1082 | #endif | |
1083 | ||
1084 | #define FL_POSIX 1 | |
1085 | #define FL_FLOCK 2 | |
1086 | #define FL_ACCESS 8 /* not trying to lock, just looking */ | |
f475ae95 | 1087 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 1088 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 1089 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 1090 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
1091 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
1092 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
1da177e4 | 1093 | |
bde74e4b MS |
1094 | /* |
1095 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
1096 | * asynchronous locking. | |
1097 | */ | |
1098 | #define FILE_LOCK_DEFERRED 1 | |
1099 | ||
1da177e4 LT |
1100 | /* |
1101 | * The POSIX file lock owner is determined by | |
1102 | * the "struct files_struct" in the thread group | |
1103 | * (or NULL for no owner - BSD locks). | |
1104 | * | |
1105 | * Lockd stuffs a "host" pointer into this. | |
1106 | */ | |
1107 | typedef struct files_struct *fl_owner_t; | |
1108 | ||
1109 | struct file_lock_operations { | |
1da177e4 LT |
1110 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
1111 | void (*fl_release_private)(struct file_lock *); | |
1112 | }; | |
1113 | ||
1114 | struct lock_manager_operations { | |
8fb47a4f BF |
1115 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
1116 | void (*lm_notify)(struct file_lock *); /* unblock callback */ | |
1117 | int (*lm_grant)(struct file_lock *, struct file_lock *, int); | |
1118 | void (*lm_release_private)(struct file_lock *); | |
1119 | void (*lm_break)(struct file_lock *); | |
1120 | int (*lm_change)(struct file_lock **, int); | |
1da177e4 LT |
1121 | }; |
1122 | ||
af558e33 BF |
1123 | struct lock_manager { |
1124 | struct list_head list; | |
1125 | }; | |
1126 | ||
1127 | void locks_start_grace(struct lock_manager *); | |
1128 | void locks_end_grace(struct lock_manager *); | |
1129 | int locks_in_grace(void); | |
1130 | ||
1da177e4 LT |
1131 | /* that will die - we need it for nfs_lock_info */ |
1132 | #include <linux/nfs_fs_i.h> | |
1133 | ||
1134 | struct file_lock { | |
1135 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
1136 | struct list_head fl_link; /* doubly linked list of all locks */ | |
1137 | struct list_head fl_block; /* circular list of blocked processes */ | |
1138 | fl_owner_t fl_owner; | |
710b7216 | 1139 | unsigned int fl_flags; |
afc1246f | 1140 | unsigned char fl_type; |
1da177e4 | 1141 | unsigned int fl_pid; |
ab1f1611 | 1142 | struct pid *fl_nspid; |
1da177e4 LT |
1143 | wait_queue_head_t fl_wait; |
1144 | struct file *fl_file; | |
1da177e4 LT |
1145 | loff_t fl_start; |
1146 | loff_t fl_end; | |
1147 | ||
1148 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
1149 | /* for lease breaks: */ |
1150 | unsigned long fl_break_time; | |
1151 | unsigned long fl_downgrade_time; | |
1da177e4 | 1152 | |
6aed6285 | 1153 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 1154 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
1155 | union { |
1156 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 1157 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
1158 | struct { |
1159 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
1160 | int state; /* state of grant or error if -ve */ | |
1161 | } afs; | |
1da177e4 LT |
1162 | } fl_u; |
1163 | }; | |
1164 | ||
1165 | /* The following constant reflects the upper bound of the file/locking space */ | |
1166 | #ifndef OFFSET_MAX | |
1167 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1168 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1169 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1170 | #endif | |
1171 | ||
1da177e4 LT |
1172 | #include <linux/fcntl.h> |
1173 | ||
bfcd17a6 TP |
1174 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1175 | ||
bfcd17a6 | 1176 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1177 | extern int fcntl_getlk(struct file *, struct flock __user *); |
c293621b PS |
1178 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
1179 | struct flock __user *); | |
1da177e4 LT |
1180 | |
1181 | #if BITS_PER_LONG == 32 | |
1182 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); | |
c293621b PS |
1183 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1184 | struct flock64 __user *); | |
1da177e4 LT |
1185 | #endif |
1186 | ||
1da177e4 LT |
1187 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1188 | extern int fcntl_getlease(struct file *filp); | |
1189 | ||
1190 | /* fs/locks.c */ | |
05fa3135 | 1191 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1192 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1193 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1194 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
1a747ee0 | 1195 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
1da177e4 LT |
1196 | extern void locks_remove_posix(struct file *, fl_owner_t); |
1197 | extern void locks_remove_flock(struct file *); | |
a9e61e25 | 1198 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1199 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1200 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
1da177e4 | 1201 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
64a318ee | 1202 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
3ee17abd | 1203 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1204 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1205 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
1da177e4 LT |
1206 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
1207 | extern int __break_lease(struct inode *inode, unsigned int flags); | |
1208 | extern void lease_get_mtime(struct inode *, struct timespec *time); | |
0af1a450 | 1209 | extern int generic_setlease(struct file *, long, struct file_lock **); |
a9933cea | 1210 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
1da177e4 LT |
1211 | extern int lease_modify(struct file_lock **, int); |
1212 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); | |
1213 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); | |
b89f4321 AB |
1214 | extern void lock_flocks(void); |
1215 | extern void unlock_flocks(void); | |
bfcd17a6 | 1216 | #else /* !CONFIG_FILE_LOCKING */ |
c2aca5e5 SW |
1217 | static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
1218 | { | |
1219 | return -EINVAL; | |
1220 | } | |
1221 | ||
1222 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1223 | unsigned int cmd, struct flock __user *user) | |
1224 | { | |
1225 | return -EACCES; | |
1226 | } | |
1227 | ||
bfcd17a6 | 1228 | #if BITS_PER_LONG == 32 |
c2aca5e5 SW |
1229 | static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
1230 | { | |
1231 | return -EINVAL; | |
1232 | } | |
1233 | ||
1234 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1235 | unsigned int cmd, struct flock64 __user *user) | |
1236 | { | |
1237 | return -EACCES; | |
1238 | } | |
bfcd17a6 | 1239 | #endif |
c2aca5e5 SW |
1240 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1241 | { | |
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | static inline int fcntl_getlease(struct file *filp) | |
1246 | { | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | static inline void locks_init_lock(struct file_lock *fl) | |
1251 | { | |
1252 | return; | |
1253 | } | |
1254 | ||
1255 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1256 | { | |
1257 | return; | |
1258 | } | |
1259 | ||
1260 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1261 | { | |
1262 | return; | |
1263 | } | |
1264 | ||
1265 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1266 | { | |
1267 | return; | |
1268 | } | |
1269 | ||
1270 | static inline void locks_remove_flock(struct file *filp) | |
1271 | { | |
1272 | return; | |
1273 | } | |
1274 | ||
1275 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1276 | { | |
1277 | return; | |
1278 | } | |
1279 | ||
1280 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1281 | struct file_lock *conflock) | |
1282 | { | |
1283 | return -ENOLCK; | |
1284 | } | |
1285 | ||
1286 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) | |
1287 | { | |
1288 | return -ENOLCK; | |
1289 | } | |
1290 | ||
1291 | static inline int posix_unblock_lock(struct file *filp, | |
1292 | struct file_lock *waiter) | |
1293 | { | |
1294 | return -ENOENT; | |
1295 | } | |
1296 | ||
1297 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1298 | { | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1303 | struct file_lock *fl, struct file_lock *conf) | |
1304 | { | |
1305 | return -ENOLCK; | |
1306 | } | |
1307 | ||
1308 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1309 | { | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | static inline int flock_lock_file_wait(struct file *filp, | |
1314 | struct file_lock *request) | |
1315 | { | |
1316 | return -ENOLCK; | |
1317 | } | |
1318 | ||
1319 | static inline int __break_lease(struct inode *inode, unsigned int mode) | |
1320 | { | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) | |
1325 | { | |
1326 | return; | |
1327 | } | |
1328 | ||
1329 | static inline int generic_setlease(struct file *filp, long arg, | |
1330 | struct file_lock **flp) | |
1331 | { | |
1332 | return -EINVAL; | |
1333 | } | |
1334 | ||
1335 | static inline int vfs_setlease(struct file *filp, long arg, | |
1336 | struct file_lock **lease) | |
1337 | { | |
1338 | return -EINVAL; | |
1339 | } | |
1340 | ||
1341 | static inline int lease_modify(struct file_lock **before, int arg) | |
1342 | { | |
1343 | return -EINVAL; | |
1344 | } | |
1345 | ||
1346 | static inline int lock_may_read(struct inode *inode, loff_t start, | |
1347 | unsigned long len) | |
1348 | { | |
1349 | return 1; | |
1350 | } | |
1351 | ||
1352 | static inline int lock_may_write(struct inode *inode, loff_t start, | |
1353 | unsigned long len) | |
1354 | { | |
1355 | return 1; | |
1356 | } | |
1357 | ||
b89f4321 AB |
1358 | static inline void lock_flocks(void) |
1359 | { | |
1360 | } | |
1361 | ||
1362 | static inline void unlock_flocks(void) | |
1363 | { | |
1364 | } | |
1365 | ||
bfcd17a6 TP |
1366 | #endif /* !CONFIG_FILE_LOCKING */ |
1367 | ||
1da177e4 LT |
1368 | |
1369 | struct fasync_struct { | |
989a2979 ED |
1370 | spinlock_t fa_lock; |
1371 | int magic; | |
1372 | int fa_fd; | |
1373 | struct fasync_struct *fa_next; /* singly linked list */ | |
1374 | struct file *fa_file; | |
1375 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1376 | }; |
1377 | ||
1378 | #define FASYNC_MAGIC 0x4601 | |
1379 | ||
1380 | /* SMP safe fasync helpers: */ | |
1381 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1382 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1383 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1384 | extern struct fasync_struct *fasync_alloc(void); | |
1385 | extern void fasync_free(struct fasync_struct *); | |
1386 | ||
1da177e4 LT |
1387 | /* can be called from interrupts */ |
1388 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1389 | |
609d7fa9 | 1390 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1da177e4 LT |
1391 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1392 | extern void f_delown(struct file *filp); | |
609d7fa9 | 1393 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1394 | extern int send_sigurg(struct fown_struct *fown); |
1395 | ||
1396 | /* | |
1397 | * Umount options | |
1398 | */ | |
1399 | ||
1400 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1401 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1402 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1403 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1404 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 LT |
1405 | |
1406 | extern struct list_head super_blocks; | |
1407 | extern spinlock_t sb_lock; | |
1408 | ||
1da177e4 LT |
1409 | struct super_block { |
1410 | struct list_head s_list; /* Keep this first */ | |
1411 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
1da177e4 | 1412 | unsigned char s_dirt; |
270ba5f7 RK |
1413 | unsigned char s_blocksize_bits; |
1414 | unsigned long s_blocksize; | |
42cb56ae | 1415 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1416 | struct file_system_type *s_type; |
ee9b6d61 | 1417 | const struct super_operations *s_op; |
61e225dc | 1418 | const struct dquot_operations *dq_op; |
0d54b217 | 1419 | const struct quotactl_ops *s_qcop; |
39655164 | 1420 | const struct export_operations *s_export_op; |
1da177e4 LT |
1421 | unsigned long s_flags; |
1422 | unsigned long s_magic; | |
1423 | struct dentry *s_root; | |
1424 | struct rw_semaphore s_umount; | |
7892f2f4 | 1425 | struct mutex s_lock; |
1da177e4 | 1426 | int s_count; |
1da177e4 | 1427 | atomic_t s_active; |
50462062 | 1428 | #ifdef CONFIG_SECURITY |
1da177e4 | 1429 | void *s_security; |
50462062 | 1430 | #endif |
bb435453 | 1431 | const struct xattr_handler **s_xattr; |
1da177e4 LT |
1432 | |
1433 | struct list_head s_inodes; /* all inodes */ | |
ceb5bdc2 | 1434 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
6416ccb7 NP |
1435 | #ifdef CONFIG_SMP |
1436 | struct list_head __percpu *s_files; | |
1437 | #else | |
1da177e4 | 1438 | struct list_head s_files; |
6416ccb7 | 1439 | #endif |
39f7c4db | 1440 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
b5c84bf6 | 1441 | /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */ |
da3bbdd4 KM |
1442 | struct list_head s_dentry_lru; /* unused dentry lru */ |
1443 | int s_nr_dentry_unused; /* # of dentry on lru */ | |
1da177e4 | 1444 | |
09cc9fc7 DC |
1445 | /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */ |
1446 | spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp; | |
98b745c6 DC |
1447 | struct list_head s_inode_lru; /* unused inode lru */ |
1448 | int s_nr_inodes_unused; /* # of inodes on lru */ | |
1449 | ||
1da177e4 | 1450 | struct block_device *s_bdev; |
32a88aa1 | 1451 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1452 | struct mtd_info *s_mtd; |
a5166169 | 1453 | struct hlist_node s_instances; |
1da177e4 LT |
1454 | struct quota_info s_dquot; /* Diskquota specific options */ |
1455 | ||
1456 | int s_frozen; | |
1457 | wait_queue_head_t s_wait_unfrozen; | |
1458 | ||
1459 | char s_id[32]; /* Informational name */ | |
0bba0169 | 1460 | u8 s_uuid[16]; /* UUID */ |
1da177e4 LT |
1461 | |
1462 | void *s_fs_info; /* Filesystem private info */ | |
8de52778 | 1463 | unsigned int s_max_links; |
30c40d2c | 1464 | fmode_t s_mode; |
1da177e4 | 1465 | |
270ba5f7 RK |
1466 | /* Granularity of c/m/atime in ns. |
1467 | Cannot be worse than a second */ | |
1468 | u32 s_time_gran; | |
1469 | ||
1da177e4 LT |
1470 | /* |
1471 | * The next field is for VFS *only*. No filesystems have any business | |
1472 | * even looking at it. You had been warned. | |
1473 | */ | |
a11f3a05 | 1474 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1475 | |
79c0b2df MS |
1476 | /* |
1477 | * Filesystem subtype. If non-empty the filesystem type field | |
1478 | * in /proc/mounts will be "type.subtype" | |
1479 | */ | |
1480 | char *s_subtype; | |
b3b304a2 MS |
1481 | |
1482 | /* | |
1483 | * Saved mount options for lazy filesystems using | |
1484 | * generic_show_options() | |
1485 | */ | |
4d2deb40 | 1486 | char __rcu *s_options; |
c8aebb0c | 1487 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1488 | |
1489 | /* | |
1490 | * Saved pool identifier for cleancache (-1 means none) | |
1491 | */ | |
1492 | int cleancache_poolid; | |
b0d40c92 DC |
1493 | |
1494 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1495 | |
7ada4db8 MS |
1496 | /* Number of inodes with nlink == 0 but still referenced */ |
1497 | atomic_long_t s_remove_count; | |
1498 | ||
4ed5e82f MS |
1499 | /* Being remounted read-only */ |
1500 | int s_readonly_remount; | |
1da177e4 LT |
1501 | }; |
1502 | ||
b0d40c92 DC |
1503 | /* superblock cache pruning functions */ |
1504 | extern void prune_icache_sb(struct super_block *sb, int nr_to_scan); | |
1505 | extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan); | |
1506 | ||
1da177e4 LT |
1507 | extern struct timespec current_fs_time(struct super_block *sb); |
1508 | ||
1509 | /* | |
1510 | * Snapshotting support. | |
1511 | */ | |
1512 | enum { | |
1513 | SB_UNFROZEN = 0, | |
1514 | SB_FREEZE_WRITE = 1, | |
1515 | SB_FREEZE_TRANS = 2, | |
1516 | }; | |
1517 | ||
1518 | #define vfs_check_frozen(sb, level) \ | |
1519 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) | |
1520 | ||
e795b717 SH |
1521 | /* |
1522 | * until VFS tracks user namespaces for inodes, just make all files | |
1523 | * belong to init_user_ns | |
1524 | */ | |
1525 | extern struct user_namespace init_user_ns; | |
1526 | #define inode_userns(inode) (&init_user_ns) | |
2e149670 | 1527 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1528 | |
914e2637 AV |
1529 | /* not quite ready to be deprecated, but... */ |
1530 | extern void lock_super(struct super_block *); | |
1531 | extern void unlock_super(struct super_block *); | |
1da177e4 LT |
1532 | |
1533 | /* | |
1534 | * VFS helper functions.. | |
1535 | */ | |
4acdaf27 | 1536 | extern int vfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *); |
18bb1db3 | 1537 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1538 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1539 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
1da177e4 LT |
1540 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
1541 | extern int vfs_rmdir(struct inode *, struct dentry *); | |
1542 | extern int vfs_unlink(struct inode *, struct dentry *); | |
1543 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1544 | ||
1545 | /* | |
1546 | * VFS dentry helper functions. | |
1547 | */ | |
1548 | extern void dentry_unhash(struct dentry *dentry); | |
1549 | ||
8c744fb8 CH |
1550 | /* |
1551 | * VFS file helper functions. | |
1552 | */ | |
a1bd120d | 1553 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1554 | umode_t mode); |
c4b929b8 MF |
1555 | /* |
1556 | * VFS FS_IOC_FIEMAP helper definitions. | |
1557 | */ | |
1558 | struct fiemap_extent_info { | |
1559 | unsigned int fi_flags; /* Flags as passed from user */ | |
1560 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1561 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1562 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1563 | fiemap_extent array */ | |
c4b929b8 MF |
1564 | }; |
1565 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1566 | u64 phys, u64 len, u32 flags); | |
1567 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1568 | ||
1da177e4 LT |
1569 | /* |
1570 | * File types | |
1571 | * | |
1572 | * NOTE! These match bits 12..15 of stat.st_mode | |
1573 | * (ie "(i_mode >> 12) & 15"). | |
1574 | */ | |
1575 | #define DT_UNKNOWN 0 | |
1576 | #define DT_FIFO 1 | |
1577 | #define DT_CHR 2 | |
1578 | #define DT_DIR 4 | |
1579 | #define DT_BLK 6 | |
1580 | #define DT_REG 8 | |
1581 | #define DT_LNK 10 | |
1582 | #define DT_SOCK 12 | |
1583 | #define DT_WHT 14 | |
1584 | ||
1da177e4 LT |
1585 | /* |
1586 | * This is the "filldir" function type, used by readdir() to let | |
1587 | * the kernel specify what kind of dirent layout it wants to have. | |
1588 | * This allows the kernel to read directories into kernel space or | |
1589 | * to have different dirent layouts depending on the binary type. | |
1590 | */ | |
afefdbb2 | 1591 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
08f85851 | 1592 | struct block_device_operations; |
1da177e4 | 1593 | |
1da177e4 LT |
1594 | /* These macros are for out of kernel modules to test that |
1595 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1596 | * fields in struct file_operations. */ | |
1597 | #define HAVE_COMPAT_IOCTL 1 | |
1598 | #define HAVE_UNLOCKED_IOCTL 1 | |
1599 | ||
1da177e4 LT |
1600 | struct file_operations { |
1601 | struct module *owner; | |
1602 | loff_t (*llseek) (struct file *, loff_t, int); | |
1603 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1604 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
027445c3 BP |
1605 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1606 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); | |
1da177e4 LT |
1607 | int (*readdir) (struct file *, void *, filldir_t); |
1608 | unsigned int (*poll) (struct file *, struct poll_table_struct *); | |
1da177e4 LT |
1609 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1610 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1611 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1612 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1613 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1614 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1615 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1616 | int (*aio_fsync) (struct kiocb *, int datasync); |
1617 | int (*fasync) (int, struct file *, int); | |
1618 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1619 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1620 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1621 | int (*check_flags)(int); | |
1da177e4 | 1622 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1623 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1624 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
f9ffed26 | 1625 | int (*setlease)(struct file *, long, struct file_lock **); |
2fe17c10 CH |
1626 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1627 | loff_t len); | |
1da177e4 LT |
1628 | }; |
1629 | ||
1630 | struct inode_operations { | |
1da177e4 | 1631 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); |
44a7d7a8 | 1632 | void * (*follow_link) (struct dentry *, struct nameidata *); |
10556cb2 | 1633 | int (*permission) (struct inode *, int); |
4e34e719 | 1634 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1635 | |
1636 | int (*readlink) (struct dentry *, char __user *,int); | |
1637 | void (*put_link) (struct dentry *, struct nameidata *, void *); | |
1638 | ||
4acdaf27 | 1639 | int (*create) (struct inode *,struct dentry *,umode_t,struct nameidata *); |
1da177e4 LT |
1640 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1641 | int (*unlink) (struct inode *,struct dentry *); | |
1642 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1643 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1644 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1645 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 LT |
1646 | int (*rename) (struct inode *, struct dentry *, |
1647 | struct inode *, struct dentry *); | |
1da177e4 | 1648 | void (*truncate) (struct inode *); |
1da177e4 LT |
1649 | int (*setattr) (struct dentry *, struct iattr *); |
1650 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1651 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); | |
1652 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); | |
1653 | ssize_t (*listxattr) (struct dentry *, char *, size_t); | |
1654 | int (*removexattr) (struct dentry *, const char *); | |
f6b3ec23 | 1655 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
c4b929b8 MF |
1656 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1657 | u64 len); | |
44a7d7a8 | 1658 | } ____cacheline_aligned; |
1da177e4 LT |
1659 | |
1660 | struct seq_file; | |
1661 | ||
eed4e51f | 1662 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1663 | unsigned long nr_segs, unsigned long fast_segs, |
1664 | struct iovec *fast_pointer, | |
1665 | struct iovec **ret_pointer, | |
1666 | int check_access); | |
eed4e51f | 1667 | |
1da177e4 LT |
1668 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1669 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1670 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
1671 | unsigned long, loff_t *); | |
1672 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, | |
1673 | unsigned long, loff_t *); | |
1674 | ||
1da177e4 LT |
1675 | struct super_operations { |
1676 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1677 | void (*destroy_inode)(struct inode *); | |
1678 | ||
aa385729 | 1679 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1680 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1681 | int (*drop_inode) (struct inode *); |
be7ce416 | 1682 | void (*evict_inode) (struct inode *); |
1da177e4 LT |
1683 | void (*put_super) (struct super_block *); |
1684 | void (*write_super) (struct super_block *); | |
1685 | int (*sync_fs)(struct super_block *sb, int wait); | |
c4be0c1d TS |
1686 | int (*freeze_fs) (struct super_block *); |
1687 | int (*unfreeze_fs) (struct super_block *); | |
726c3342 | 1688 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1689 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1690 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1691 | |
34c80b1d | 1692 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1693 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1694 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1695 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1696 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1697 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1698 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
0e51a720 | 1699 | #endif |
87d8fe1e | 1700 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
0e1fdafd DC |
1701 | int (*nr_cached_objects)(struct super_block *); |
1702 | void (*free_cached_objects)(struct super_block *, int); | |
1da177e4 LT |
1703 | }; |
1704 | ||
1c0eeaf5 | 1705 | /* |
250df6ed | 1706 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
1707 | * |
1708 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1709 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1710 | * | |
1711 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1712 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1713 | * various stages of removing an inode. | |
1714 | * | |
eaff8079 | 1715 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 1716 | * |
e7ca2d41 JE |
1717 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1718 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
1719 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1720 | * these changes separately from I_DIRTY_SYNC so that we | |
1721 | * don't have to write inode on fdatasync() when only | |
1722 | * mtime has changed in it. | |
1c0eeaf5 | 1723 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
1724 | * I_NEW Serves as both a mutex and completion notification. |
1725 | * New inodes set I_NEW. If two processes both create | |
1726 | * the same inode, one of them will release its inode and | |
1727 | * wait for I_NEW to be released before returning. | |
1728 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1729 | * also cause waiting on I_NEW, without I_NEW actually | |
1730 | * being set. find_inode() uses this to prevent returning | |
1731 | * nearly-dead inodes. | |
1c0eeaf5 JE |
1732 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1733 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1734 | * cleared. | |
1735 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1736 | * pages or buffers attached or the inode itself is still | |
1737 | * dirty. | |
b57922d9 | 1738 | * I_CLEAR Added by end_writeback(). In this state the inode is clean |
a4ffdde6 | 1739 | * and can be destroyed. Inode keeps I_FREEING. |
1c0eeaf5 JE |
1740 | * |
1741 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1742 | * prohibited for many purposes. iget() must wait for | |
1743 | * the inode to be completely released, then create it | |
1744 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 1745 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 1746 | * |
eaff8079 CH |
1747 | * I_SYNC Synchonized write of dirty inode data. The bits is |
1748 | * set during data writeback, and cleared with a wakeup | |
1749 | * on the bit address once it is done. | |
1c0eeaf5 | 1750 | * |
bd5fe6c5 CH |
1751 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1752 | * | |
1753 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
1754 | * | |
1c0eeaf5 | 1755 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 1756 | */ |
9e38d86f NP |
1757 | #define I_DIRTY_SYNC (1 << 0) |
1758 | #define I_DIRTY_DATASYNC (1 << 1) | |
1759 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
1760 | #define __I_NEW 3 |
1761 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
1762 | #define I_WILL_FREE (1 << 4) |
1763 | #define I_FREEING (1 << 5) | |
1764 | #define I_CLEAR (1 << 6) | |
eaff8079 | 1765 | #define __I_SYNC 7 |
1c0eeaf5 | 1766 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 1767 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 CH |
1768 | #define __I_DIO_WAKEUP 9 |
1769 | #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) | |
1da177e4 LT |
1770 | |
1771 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
1772 | ||
1773 | extern void __mark_inode_dirty(struct inode *, int); | |
1774 | static inline void mark_inode_dirty(struct inode *inode) | |
1775 | { | |
1776 | __mark_inode_dirty(inode, I_DIRTY); | |
1777 | } | |
1778 | ||
1779 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1780 | { | |
1781 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1782 | } | |
1783 | ||
7ada4db8 MS |
1784 | extern void inc_nlink(struct inode *inode); |
1785 | extern void drop_nlink(struct inode *inode); | |
1786 | extern void clear_nlink(struct inode *inode); | |
1787 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
1788 | |
1789 | static inline void inode_inc_link_count(struct inode *inode) | |
1790 | { | |
1791 | inc_nlink(inode); | |
66d21730 AD |
1792 | mark_inode_dirty(inode); |
1793 | } | |
1794 | ||
9a53c3a7 DH |
1795 | static inline void inode_dec_link_count(struct inode *inode) |
1796 | { | |
1797 | drop_nlink(inode); | |
66d21730 AD |
1798 | mark_inode_dirty(inode); |
1799 | } | |
1800 | ||
25ec56b5 JNC |
1801 | /** |
1802 | * inode_inc_iversion - increments i_version | |
1803 | * @inode: inode that need to be updated | |
1804 | * | |
1805 | * Every time the inode is modified, the i_version field will be incremented. | |
1806 | * The filesystem has to be mounted with i_version flag | |
1807 | */ | |
1808 | ||
1809 | static inline void inode_inc_iversion(struct inode *inode) | |
1810 | { | |
1811 | spin_lock(&inode->i_lock); | |
1812 | inode->i_version++; | |
1813 | spin_unlock(&inode->i_lock); | |
1814 | } | |
1815 | ||
68ac1234 | 1816 | extern void touch_atime(struct path *); |
1da177e4 LT |
1817 | static inline void file_accessed(struct file *file) |
1818 | { | |
1819 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 1820 | touch_atime(&file->f_path); |
1da177e4 LT |
1821 | } |
1822 | ||
1823 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 1824 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 1825 | |
1da177e4 LT |
1826 | struct file_system_type { |
1827 | const char *name; | |
1828 | int fs_flags; | |
c96e41e9 AV |
1829 | struct dentry *(*mount) (struct file_system_type *, int, |
1830 | const char *, void *); | |
1da177e4 LT |
1831 | void (*kill_sb) (struct super_block *); |
1832 | struct module *owner; | |
1833 | struct file_system_type * next; | |
a5166169 | 1834 | struct hlist_head fs_supers; |
d475fd42 | 1835 | |
cf516249 | 1836 | struct lock_class_key s_lock_key; |
897c6ff9 | 1837 | struct lock_class_key s_umount_key; |
51ee049e | 1838 | struct lock_class_key s_vfs_rename_key; |
d475fd42 PZ |
1839 | |
1840 | struct lock_class_key i_lock_key; | |
1841 | struct lock_class_key i_mutex_key; | |
14358e6d | 1842 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
1843 | }; |
1844 | ||
ceefda69 AV |
1845 | extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
1846 | void *data, int (*fill_super)(struct super_block *, void *, int)); | |
152a0836 AV |
1847 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
1848 | int flags, const char *dev_name, void *data, | |
1849 | int (*fill_super)(struct super_block *, void *, int)); | |
fc14f2fe AV |
1850 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
1851 | int flags, void *data, | |
1852 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
1853 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
1854 | int flags, void *data, | |
1855 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 1856 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 LT |
1857 | void generic_shutdown_super(struct super_block *sb); |
1858 | void kill_block_super(struct super_block *sb); | |
1859 | void kill_anon_super(struct super_block *sb); | |
1860 | void kill_litter_super(struct super_block *sb); | |
1861 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 1862 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 1863 | int set_anon_super(struct super_block *s, void *data); |
0ee5dc67 AV |
1864 | int get_anon_bdev(dev_t *); |
1865 | void free_anon_bdev(dev_t); | |
1da177e4 LT |
1866 | struct super_block *sget(struct file_system_type *type, |
1867 | int (*test)(struct super_block *,void *), | |
1868 | int (*set)(struct super_block *,void *), | |
1869 | void *data); | |
51139ada | 1870 | extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
c74a1cbb AV |
1871 | const struct super_operations *ops, |
1872 | const struct dentry_operations *dops, | |
1873 | unsigned long); | |
1da177e4 LT |
1874 | |
1875 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
1876 | #define fops_get(fops) \ | |
1877 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
1878 | #define fops_put(fops) \ | |
1879 | do { if (fops) module_put((fops)->owner); } while(0) | |
1880 | ||
1881 | extern int register_filesystem(struct file_system_type *); | |
1882 | extern int unregister_filesystem(struct file_system_type *); | |
8bf9725c PE |
1883 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
1884 | #define kern_mount(type) kern_mount_data(type, NULL) | |
423e0ab0 | 1885 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
1886 | extern int may_umount_tree(struct vfsmount *); |
1887 | extern int may_umount(struct vfsmount *); | |
1888 | extern long do_mount(char *, char *, char *, unsigned long, void *); | |
589ff870 | 1889 | extern struct vfsmount *collect_mounts(struct path *); |
8aec0809 | 1890 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
1891 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
1892 | struct vfsmount *); | |
ebabe9a9 | 1893 | extern int vfs_statfs(struct path *, struct kstatfs *); |
c8b91acc AV |
1894 | extern int user_statfs(const char __user *, struct kstatfs *); |
1895 | extern int fd_statfs(int, struct kstatfs *); | |
cf31e70d | 1896 | extern int vfs_ustat(dev_t, struct kstatfs *); |
18e9e510 JB |
1897 | extern int freeze_super(struct super_block *super); |
1898 | extern int thaw_super(struct super_block *super); | |
02125a82 | 1899 | extern bool our_mnt(struct vfsmount *mnt); |
1da177e4 | 1900 | |
ce3b0f8d AV |
1901 | extern int current_umask(void); |
1902 | ||
f87fd4c2 | 1903 | /* /sys/fs */ |
00d26666 | 1904 | extern struct kobject *fs_kobj; |
f87fd4c2 | 1905 | |
435f49a5 | 1906 | #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
bfcd17a6 TP |
1907 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
1908 | ||
1da177e4 LT |
1909 | #define FLOCK_VERIFY_READ 1 |
1910 | #define FLOCK_VERIFY_WRITE 2 | |
1911 | ||
bfcd17a6 | 1912 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 LT |
1913 | extern int locks_mandatory_locked(struct inode *); |
1914 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); | |
1915 | ||
1916 | /* | |
1917 | * Candidates for mandatory locking have the setgid bit set | |
1918 | * but no group execute bit - an otherwise meaningless combination. | |
1919 | */ | |
a16877ca PE |
1920 | |
1921 | static inline int __mandatory_lock(struct inode *ino) | |
1922 | { | |
1923 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
1924 | } | |
1925 | ||
1926 | /* | |
1927 | * ... and these candidates should be on MS_MANDLOCK mounted fs, | |
1928 | * otherwise these will be advisory locks | |
1929 | */ | |
1930 | ||
1931 | static inline int mandatory_lock(struct inode *ino) | |
1932 | { | |
1933 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
1934 | } | |
1da177e4 LT |
1935 | |
1936 | static inline int locks_verify_locked(struct inode *inode) | |
1937 | { | |
a16877ca | 1938 | if (mandatory_lock(inode)) |
1da177e4 LT |
1939 | return locks_mandatory_locked(inode); |
1940 | return 0; | |
1941 | } | |
1942 | ||
1da177e4 LT |
1943 | static inline int locks_verify_truncate(struct inode *inode, |
1944 | struct file *filp, | |
1945 | loff_t size) | |
1946 | { | |
a16877ca | 1947 | if (inode->i_flock && mandatory_lock(inode)) |
1da177e4 LT |
1948 | return locks_mandatory_area( |
1949 | FLOCK_VERIFY_WRITE, inode, filp, | |
1950 | size < inode->i_size ? size : inode->i_size, | |
1951 | (size < inode->i_size ? inode->i_size - size | |
1952 | : size - inode->i_size) | |
1953 | ); | |
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
1958 | { | |
1959 | if (inode->i_flock) | |
1960 | return __break_lease(inode, mode); | |
1961 | return 0; | |
1962 | } | |
bfcd17a6 | 1963 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
1964 | static inline int locks_mandatory_locked(struct inode *inode) |
1965 | { | |
1966 | return 0; | |
1967 | } | |
1968 | ||
1969 | static inline int locks_mandatory_area(int rw, struct inode *inode, | |
1970 | struct file *filp, loff_t offset, | |
1971 | size_t count) | |
1972 | { | |
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | static inline int __mandatory_lock(struct inode *inode) | |
1977 | { | |
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | static inline int mandatory_lock(struct inode *inode) | |
1982 | { | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | static inline int locks_verify_locked(struct inode *inode) | |
1987 | { | |
1988 | return 0; | |
1989 | } | |
1990 | ||
1991 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
1992 | size_t size) | |
1993 | { | |
1994 | return 0; | |
1995 | } | |
1996 | ||
1997 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
1998 | { | |
1999 | return 0; | |
2000 | } | |
2001 | ||
bfcd17a6 | 2002 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2003 | |
2004 | /* fs/open.c */ | |
2005 | ||
4a30131e N |
2006 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2007 | struct file *filp); | |
3e63cbb1 AJ |
2008 | extern int do_fallocate(struct file *file, int mode, loff_t offset, |
2009 | loff_t len); | |
8e8a1407 | 2010 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd AV |
2011 | umode_t mode); |
2012 | extern struct file *filp_open(const char *, int, umode_t); | |
73d049a4 AV |
2013 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
2014 | const char *, int); | |
745ca247 DH |
2015 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, |
2016 | const struct cred *); | |
1da177e4 LT |
2017 | extern int filp_close(struct file *, fl_owner_t id); |
2018 | extern char * getname(const char __user *); | |
2019 | ||
3e63cbb1 AJ |
2020 | /* fs/ioctl.c */ |
2021 | ||
2022 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2023 | ||
1da177e4 LT |
2024 | /* fs/dcache.c */ |
2025 | extern void __init vfs_caches_init_early(void); | |
2026 | extern void __init vfs_caches_init(unsigned long); | |
2027 | ||
b86c089b CL |
2028 | extern struct kmem_cache *names_cachep; |
2029 | ||
3446a8aa VN |
2030 | #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) |
2031 | #define __getname() __getname_gfp(GFP_KERNEL) | |
2032 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) | |
1da177e4 LT |
2033 | #ifndef CONFIG_AUDITSYSCALL |
2034 | #define putname(name) __putname(name) | |
2035 | #else | |
2036 | extern void putname(const char *name); | |
2037 | #endif | |
2038 | ||
9361401e | 2039 | #ifdef CONFIG_BLOCK |
1da177e4 | 2040 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2041 | extern void unregister_blkdev(unsigned int, const char *); |
1da177e4 | 2042 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2043 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 LT |
2044 | extern void bd_set_size(struct block_device *, loff_t size); |
2045 | extern void bd_forget(struct inode *inode); | |
2046 | extern void bdput(struct block_device *); | |
585d3bc0 NP |
2047 | extern void invalidate_bdev(struct block_device *); |
2048 | extern int sync_blockdev(struct block_device *bdev); | |
ff01bb48 | 2049 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2050 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2051 | extern void emergency_thaw_all(void); |
585d3bc0 NP |
2052 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2053 | extern int fsync_bdev(struct block_device *); | |
9361401e DH |
2054 | #else |
2055 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2056 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2057 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2058 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2059 | ||
2060 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2061 | { | |
2062 | return NULL; | |
2063 | } | |
2064 | ||
2065 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2066 | { | |
2067 | return 0; | |
2068 | } | |
9361401e | 2069 | #endif |
60b0680f | 2070 | extern int sync_filesystem(struct super_block *); |
9361401e | 2071 | extern const struct file_operations def_blk_fops; |
4b6f5d20 AV |
2072 | extern const struct file_operations def_chr_fops; |
2073 | extern const struct file_operations bad_sock_fops; | |
2074 | extern const struct file_operations def_fifo_fops; | |
9361401e | 2075 | #ifdef CONFIG_BLOCK |
1da177e4 | 2076 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2077 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2078 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2079 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2080 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2081 | void *holder); | |
2082 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2083 | void *holder); | |
e525fd89 | 2084 | extern int blkdev_put(struct block_device *bdev, fmode_t mode); |
641dc636 | 2085 | #ifdef CONFIG_SYSFS |
e09b457b | 2086 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2087 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2088 | struct gendisk *disk); | |
641dc636 | 2089 | #else |
e09b457b TH |
2090 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2091 | struct gendisk *disk) | |
2092 | { | |
2093 | return 0; | |
2094 | } | |
49731baa TH |
2095 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2096 | struct gendisk *disk) | |
2097 | { | |
2098 | } | |
641dc636 | 2099 | #endif |
9361401e | 2100 | #endif |
1da177e4 LT |
2101 | |
2102 | /* fs/char_dev.c */ | |
68eef3b4 | 2103 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
2104 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2105 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2106 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2107 | unsigned int count, const char *name, | |
2108 | const struct file_operations *fops); | |
2109 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2110 | unsigned int count, const char *name); | |
1da177e4 | 2111 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2112 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2113 | |
1905b1bf TH |
2114 | static inline int register_chrdev(unsigned int major, const char *name, |
2115 | const struct file_operations *fops) | |
2116 | { | |
2117 | return __register_chrdev(major, 0, 256, name, fops); | |
2118 | } | |
2119 | ||
2120 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2121 | { | |
2122 | __unregister_chrdev(major, 0, 256, name); | |
2123 | } | |
2124 | ||
1da177e4 LT |
2125 | /* fs/block_dev.c */ |
2126 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2127 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2128 | |
2129 | #ifdef CONFIG_BLOCK | |
2130 | #define BLKDEV_MAJOR_HASH_SIZE 255 | |
1da177e4 LT |
2131 | extern const char *__bdevname(dev_t, char *buffer); |
2132 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2133 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2134 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2135 | |
9361401e DH |
2136 | #else |
2137 | #define BLKDEV_MAJOR_HASH_SIZE 0 | |
2138 | #endif | |
1da177e4 LT |
2139 | |
2140 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2141 | ||
2142 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2143 | extern void make_bad_inode(struct inode *); | |
2144 | extern int is_bad_inode(struct inode *); | |
2145 | ||
d2d9648e DV |
2146 | extern const struct file_operations read_pipefifo_fops; |
2147 | extern const struct file_operations write_pipefifo_fops; | |
2148 | extern const struct file_operations rdwr_pipefifo_fops; | |
1da177e4 | 2149 | |
9361401e | 2150 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
2151 | /* |
2152 | * return READ, READA, or WRITE | |
2153 | */ | |
2154 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) | |
2155 | ||
2156 | /* | |
2157 | * return data direction, READ or WRITE | |
2158 | */ | |
2159 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) | |
2160 | ||
c3279d14 AP |
2161 | extern void check_disk_size_change(struct gendisk *disk, |
2162 | struct block_device *bdev); | |
0c002c2f | 2163 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2164 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2165 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2166 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2167 | #endif |
1da177e4 LT |
2168 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2169 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2170 | |
1da177e4 LT |
2171 | static inline void invalidate_remote_inode(struct inode *inode) |
2172 | { | |
2173 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2174 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2175 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2176 | } |
2177 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2178 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2179 | pgoff_t start, pgoff_t end); | |
2180 | extern int write_inode_now(struct inode *, int); | |
2181 | extern int filemap_fdatawrite(struct address_space *); | |
2182 | extern int filemap_flush(struct address_space *); | |
2183 | extern int filemap_fdatawait(struct address_space *); | |
d3bccb6f JK |
2184 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2185 | loff_t lend); | |
1da177e4 LT |
2186 | extern int filemap_write_and_wait(struct address_space *mapping); |
2187 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2188 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2189 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2190 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2191 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2192 | loff_t start, loff_t end); | |
ebcf28e1 | 2193 | |
8018ab05 CH |
2194 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2195 | int datasync); | |
2196 | extern int vfs_fsync(struct file *file, int datasync); | |
148f948b | 2197 | extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); |
1da177e4 | 2198 | extern void sync_supers(void); |
1da177e4 LT |
2199 | extern void emergency_sync(void); |
2200 | extern void emergency_remount(void); | |
9361401e | 2201 | #ifdef CONFIG_BLOCK |
1da177e4 | 2202 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2203 | #endif |
1da177e4 | 2204 | extern int notify_change(struct dentry *, struct iattr *); |
f419a2e3 | 2205 | extern int inode_permission(struct inode *, int); |
2830ba7f | 2206 | extern int generic_permission(struct inode *, int); |
1da177e4 | 2207 | |
f696a365 MS |
2208 | static inline bool execute_ok(struct inode *inode) |
2209 | { | |
2210 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2211 | } | |
2212 | ||
07b8ce1e AV |
2213 | /* |
2214 | * get_write_access() gets write permission for a file. | |
2215 | * put_write_access() releases this write permission. | |
2216 | * This is used for regular files. | |
2217 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2218 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2219 | * can have the following values: | |
2220 | * 0: no writers, no VM_DENYWRITE mappings | |
2221 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2222 | * > 0: (i_writecount) users are writing to the file. | |
2223 | * | |
2224 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2225 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2226 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2227 | * to do the change if sign is wrong. | |
2228 | */ | |
2229 | static inline int get_write_access(struct inode *inode) | |
2230 | { | |
2231 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2232 | } | |
2233 | static inline int deny_write_access(struct file *file) | |
2234 | { | |
2235 | struct inode *inode = file->f_path.dentry->d_inode; | |
2236 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2237 | } | |
1da177e4 LT |
2238 | static inline void put_write_access(struct inode * inode) |
2239 | { | |
2240 | atomic_dec(&inode->i_writecount); | |
2241 | } | |
2242 | static inline void allow_write_access(struct file *file) | |
2243 | { | |
2244 | if (file) | |
0f7fc9e4 | 2245 | atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
1da177e4 | 2246 | } |
a5c96ebf MZ |
2247 | #ifdef CONFIG_IMA |
2248 | static inline void i_readcount_dec(struct inode *inode) | |
2249 | { | |
2250 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2251 | atomic_dec(&inode->i_readcount); | |
2252 | } | |
2253 | static inline void i_readcount_inc(struct inode *inode) | |
2254 | { | |
2255 | atomic_inc(&inode->i_readcount); | |
2256 | } | |
2257 | #else | |
2258 | static inline void i_readcount_dec(struct inode *inode) | |
2259 | { | |
2260 | return; | |
2261 | } | |
2262 | static inline void i_readcount_inc(struct inode *inode) | |
2263 | { | |
2264 | return; | |
2265 | } | |
2266 | #endif | |
ed8cae8b | 2267 | extern int do_pipe_flags(int *, int); |
be61a86d UD |
2268 | extern struct file *create_read_pipe(struct file *f, int flags); |
2269 | extern struct file *create_write_pipe(int flags); | |
d6cbd281 | 2270 | extern void free_write_pipe(struct file *); |
1da177e4 | 2271 | |
6777d773 | 2272 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
1da177e4 LT |
2273 | extern struct file * open_exec(const char *); |
2274 | ||
2275 | /* fs/dcache.c -- generic fs support functions */ | |
2276 | extern int is_subdir(struct dentry *, struct dentry *); | |
2096f759 | 2277 | extern int path_is_under(struct path *, struct path *); |
1da177e4 LT |
2278 | extern ino_t find_inode_number(struct dentry *, struct qstr *); |
2279 | ||
2280 | #include <linux/err.h> | |
2281 | ||
2282 | /* needed for stackable file system support */ | |
2283 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); | |
2284 | ||
2285 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); | |
2286 | ||
54e34621 | 2287 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2288 | extern void inode_init_once(struct inode *); |
2aa15890 | 2289 | extern void address_space_init_once(struct address_space *mapping); |
7de9c6ee | 2290 | extern void ihold(struct inode * inode); |
1da177e4 LT |
2291 | extern void iput(struct inode *); |
2292 | extern struct inode * igrab(struct inode *); | |
2293 | extern ino_t iunique(struct super_block *, ino_t); | |
2294 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2295 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2296 | static inline int generic_drop_inode(struct inode *inode) |
2297 | { | |
2298 | return !inode->i_nlink || inode_unhashed(inode); | |
2299 | } | |
1da177e4 | 2300 | |
88bd5121 AA |
2301 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2302 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2303 | void *data); | |
1da177e4 LT |
2304 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2305 | int (*test)(struct inode *, void *), void *data); | |
2306 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2307 | ||
2308 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
2309 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
261bca86 AV |
2310 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2311 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
2312 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2313 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
2314 | #else | |
2315 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
2316 | #endif | |
1da177e4 | 2317 | extern void unlock_new_inode(struct inode *); |
85fe4025 | 2318 | extern unsigned int get_next_ino(void); |
1da177e4 | 2319 | |
1da177e4 | 2320 | extern void __iget(struct inode * inode); |
b46980fe | 2321 | extern void iget_failed(struct inode *); |
b0683aa6 | 2322 | extern void end_writeback(struct inode *); |
2e00c97e | 2323 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
2324 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2325 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 2326 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 2327 | extern int should_remove_suid(struct dentry *); |
2f1936b8 | 2328 | extern int file_remove_suid(struct file *); |
1da177e4 LT |
2329 | |
2330 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
2331 | static inline void insert_inode_hash(struct inode *inode) |
2332 | { | |
1da177e4 LT |
2333 | __insert_inode_hash(inode, inode->i_ino); |
2334 | } | |
f2ee7abf ED |
2335 | |
2336 | extern void __remove_inode_hash(struct inode *); | |
2337 | static inline void remove_inode_hash(struct inode *inode) | |
2338 | { | |
2339 | if (!inode_unhashed(inode)) | |
2340 | __remove_inode_hash(inode); | |
2341 | } | |
2342 | ||
646ec461 | 2343 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 2344 | |
9361401e | 2345 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
2346 | extern void submit_bio(int, struct bio *); |
2347 | extern int bdev_read_only(struct block_device *); | |
9361401e | 2348 | #endif |
1da177e4 LT |
2349 | extern int set_blocksize(struct block_device *, int); |
2350 | extern int sb_set_blocksize(struct super_block *, int); | |
2351 | extern int sb_min_blocksize(struct super_block *, int); | |
2352 | ||
2353 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
2354 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
2355 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1da177e4 | 2356 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
027445c3 | 2357 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
e4dd9de3 JK |
2358 | extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, |
2359 | loff_t *); | |
027445c3 | 2360 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1da177e4 LT |
2361 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
2362 | unsigned long *, loff_t, loff_t *, size_t, size_t); | |
2363 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, | |
2364 | unsigned long, loff_t, loff_t *, size_t, ssize_t); | |
2365 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); | |
2366 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); | |
0ceb3314 DM |
2367 | extern int generic_segment_checks(const struct iovec *iov, |
2368 | unsigned long *nr_segs, size_t *count, int access_flags); | |
88e6faef | 2369 | |
eef99380 CH |
2370 | /* fs/block_dev.c */ |
2371 | extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
2372 | unsigned long nr_segs, loff_t pos); | |
02c24a82 JB |
2373 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2374 | int datasync); | |
ff01bb48 | 2375 | extern void block_sync_page(struct page *page); |
eef99380 | 2376 | |
88e6faef | 2377 | /* fs/splice.c */ |
cbb7e577 | 2378 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 2379 | struct pipe_inode_info *, size_t, unsigned int); |
6818173b MS |
2380 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
2381 | struct pipe_inode_info *, size_t, unsigned int); | |
88e6faef | 2382 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 2383 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 2384 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 JA |
2385 | struct file *out, loff_t *, size_t len, unsigned int flags); |
2386 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, | |
88e6faef AM |
2387 | size_t len, unsigned int flags); |
2388 | ||
1da177e4 LT |
2389 | extern void |
2390 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
ae6afc3f | 2391 | extern loff_t noop_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 LT |
2392 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
2393 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); | |
5760495a AK |
2394 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
2395 | int origin, loff_t maxsize); | |
1da177e4 LT |
2396 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2397 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
2398 | ||
ceffc078 | 2399 | #ifdef CONFIG_FS_XIP |
eb6fe0c3 CO |
2400 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
2401 | loff_t *ppos); | |
ceffc078 | 2402 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
eb6fe0c3 CO |
2403 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
2404 | size_t len, loff_t *ppos); | |
ceffc078 | 2405 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
6d79125b CO |
2406 | #else |
2407 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) | |
2408 | { | |
2409 | return 0; | |
2410 | } | |
ceffc078 CO |
2411 | #endif |
2412 | ||
9361401e | 2413 | #ifdef CONFIG_BLOCK |
facd07b0 JB |
2414 | typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
2415 | loff_t file_offset); | |
1da177e4 LT |
2416 | |
2417 | enum { | |
1e431f5c CH |
2418 | /* need locking between buffered and direct access */ |
2419 | DIO_LOCKING = 0x01, | |
2420 | ||
2421 | /* filesystem does not support filling holes */ | |
2422 | DIO_SKIP_HOLES = 0x02, | |
1da177e4 LT |
2423 | }; |
2424 | ||
eafdc7d1 | 2425 | void dio_end_io(struct bio *bio, int error); |
bd5fe6c5 CH |
2426 | void inode_dio_wait(struct inode *inode); |
2427 | void inode_dio_done(struct inode *inode); | |
eafdc7d1 CH |
2428 | |
2429 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, | |
2430 | struct block_device *bdev, const struct iovec *iov, loff_t offset, | |
2431 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, | |
2432 | dio_submit_t submit_io, int flags); | |
7bb46a67 | 2433 | |
1da177e4 | 2434 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
aacfc19c CH |
2435 | struct inode *inode, const struct iovec *iov, loff_t offset, |
2436 | unsigned long nr_segs, get_block_t get_block) | |
1da177e4 | 2437 | { |
aacfc19c CH |
2438 | return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
2439 | offset, nr_segs, get_block, NULL, NULL, | |
1e431f5c | 2440 | DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 2441 | } |
ed70afcd RD |
2442 | #else |
2443 | static inline void inode_dio_wait(struct inode *inode) | |
2444 | { | |
2445 | } | |
9361401e | 2446 | #endif |
1da177e4 | 2447 | |
4b6f5d20 | 2448 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
2449 | |
2450 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
2451 | ||
2452 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); | |
2453 | extern int vfs_follow_link(struct nameidata *, const char *); | |
2454 | extern int page_readlink(struct dentry *, char __user *, int); | |
cc314eef LT |
2455 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
2456 | extern void page_put_link(struct dentry *, struct nameidata *, void *); | |
0adb25d2 | 2457 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 2458 | int nofs); |
1da177e4 | 2459 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 2460 | extern const struct inode_operations page_symlink_inode_operations; |
1da177e4 LT |
2461 | extern int generic_readlink(struct dentry *, char __user *, int); |
2462 | extern void generic_fillattr(struct inode *, struct kstat *); | |
2463 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
b462707e | 2464 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 LT |
2465 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
2466 | void inode_sub_bytes(struct inode *inode, loff_t bytes); | |
2467 | loff_t inode_get_bytes(struct inode *inode); | |
2468 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
2469 | ||
2470 | extern int vfs_readdir(struct file *, filldir_t, void *); | |
2471 | ||
c7887325 DH |
2472 | extern int vfs_stat(const char __user *, struct kstat *); |
2473 | extern int vfs_lstat(const char __user *, struct kstat *); | |
1da177e4 | 2474 | extern int vfs_fstat(unsigned int, struct kstat *); |
c7887325 | 2475 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
1da177e4 | 2476 | |
deb21db7 EZ |
2477 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
2478 | unsigned long arg); | |
e9079cce | 2479 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
2480 | struct fiemap_extent_info *fieinfo, |
2481 | loff_t start, loff_t len, | |
2482 | get_block_t *get_block); | |
68c9d702 JB |
2483 | extern int generic_block_fiemap(struct inode *inode, |
2484 | struct fiemap_extent_info *fieinfo, u64 start, | |
2485 | u64 len, get_block_t *get_block); | |
1da177e4 | 2486 | |
c18479fe MS |
2487 | extern void get_filesystem(struct file_system_type *fs); |
2488 | extern void put_filesystem(struct file_system_type *fs); | |
1da177e4 LT |
2489 | extern struct file_system_type *get_fs_type(const char *name); |
2490 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 2491 | extern struct super_block *get_super_thawed(struct block_device *); |
4504230a | 2492 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 2493 | extern void drop_super(struct super_block *sb); |
01a05b33 | 2494 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
2495 | extern void iterate_supers_type(struct file_system_type *, |
2496 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
2497 | |
2498 | extern int dcache_dir_open(struct inode *, struct file *); | |
2499 | extern int dcache_dir_close(struct inode *, struct file *); | |
2500 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
2501 | extern int dcache_readdir(struct file *, void *, filldir_t); | |
7bb46a67 | 2502 | extern int simple_setattr(struct dentry *, struct iattr *); |
1da177e4 | 2503 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
726c3342 | 2504 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
2505 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
2506 | extern int simple_unlink(struct inode *, struct dentry *); | |
2507 | extern int simple_rmdir(struct inode *, struct dentry *); | |
2508 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
02c24a82 | 2509 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
2510 | extern int simple_empty(struct dentry *); |
2511 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
2512 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
2513 | loff_t pos, unsigned len, unsigned flags, | |
2514 | struct page **pagep, void **fsdata); | |
2515 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
2516 | loff_t pos, unsigned len, unsigned copied, | |
2517 | struct page *page, void *fsdata); | |
1da177e4 LT |
2518 | |
2519 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); | |
2520 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); | |
4b6f5d20 | 2521 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 2522 | extern const struct inode_operations simple_dir_inode_operations; |
4b6f5d20 | 2523 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 2524 | struct dentry *d_alloc_name(struct dentry *, const char *); |
7d683a09 | 2525 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
1f5ce9e9 | 2526 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
2527 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
2528 | ||
93b07113 AM |
2529 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
2530 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
2531 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
2532 | const void __user *from, size_t count); | |
1da177e4 | 2533 | |
02c24a82 | 2534 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 2535 | |
30ca22c7 PL |
2536 | extern int generic_check_addressable(unsigned, u64); |
2537 | ||
e965f963 | 2538 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 2539 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
2540 | struct page *, struct page *, |
2541 | enum migrate_mode); | |
e965f963 CL |
2542 | #else |
2543 | #define buffer_migrate_page NULL | |
2544 | #endif | |
2545 | ||
25d9e2d1 | 2546 | extern int inode_change_ok(const struct inode *, struct iattr *); |
2547 | extern int inode_newsize_ok(const struct inode *, loff_t offset); | |
6a1a90ad | 2548 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 2549 | |
870f4817 | 2550 | extern void file_update_time(struct file *file); |
1da177e4 | 2551 | |
34c80b1d | 2552 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
b3b304a2 | 2553 | extern void save_mount_options(struct super_block *sb, char *options); |
2a32cebd | 2554 | extern void replace_mount_options(struct super_block *sb, char *options); |
b3b304a2 | 2555 | |
1da177e4 LT |
2556 | static inline ino_t parent_ino(struct dentry *dentry) |
2557 | { | |
2558 | ino_t res; | |
2559 | ||
b5c84bf6 NP |
2560 | /* |
2561 | * Don't strictly need d_lock here? If the parent ino could change | |
2562 | * then surely we'd have a deeper race in the caller? | |
2563 | */ | |
1da177e4 LT |
2564 | spin_lock(&dentry->d_lock); |
2565 | res = dentry->d_parent->d_inode->i_ino; | |
2566 | spin_unlock(&dentry->d_lock); | |
2567 | return res; | |
2568 | } | |
2569 | ||
1da177e4 LT |
2570 | /* Transaction based IO helpers */ |
2571 | ||
2572 | /* | |
2573 | * An argresp is stored in an allocated page and holds the | |
2574 | * size of the argument or response, along with its content | |
2575 | */ | |
2576 | struct simple_transaction_argresp { | |
2577 | ssize_t size; | |
2578 | char data[0]; | |
2579 | }; | |
2580 | ||
2581 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
2582 | ||
2583 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
2584 | size_t size); | |
2585 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
2586 | size_t size, loff_t *pos); | |
2587 | int simple_transaction_release(struct inode *inode, struct file *file); | |
2588 | ||
76791ab2 | 2589 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 2590 | |
acaefc25 AB |
2591 | /* |
2592 | * simple attribute files | |
2593 | * | |
2594 | * These attributes behave similar to those in sysfs: | |
2595 | * | |
2596 | * Writing to an attribute immediately sets a value, an open file can be | |
2597 | * written to multiple times. | |
2598 | * | |
2599 | * Reading from an attribute creates a buffer from the value that might get | |
2600 | * read with multiple read calls. When the attribute has been read | |
2601 | * completely, no further read calls are possible until the file is opened | |
2602 | * again. | |
2603 | * | |
2604 | * All attributes contain a text representation of a numeric value | |
2605 | * that are accessed with the get() and set() functions. | |
2606 | */ | |
2607 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
2608 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
2609 | { \ | |
2610 | __simple_attr_check_format(__fmt, 0ull); \ | |
2611 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
2612 | } \ | |
828c0950 | 2613 | static const struct file_operations __fops = { \ |
acaefc25 AB |
2614 | .owner = THIS_MODULE, \ |
2615 | .open = __fops ## _open, \ | |
74bedc4d | 2616 | .release = simple_attr_release, \ |
acaefc25 AB |
2617 | .read = simple_attr_read, \ |
2618 | .write = simple_attr_write, \ | |
1ec5584e | 2619 | .llseek = generic_file_llseek, \ |
acaefc25 AB |
2620 | }; |
2621 | ||
b9075fa9 JP |
2622 | static inline __printf(1, 2) |
2623 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
2624 | { |
2625 | /* don't do anything, just let the compiler check the arguments; */ | |
2626 | } | |
2627 | ||
2628 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 2629 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 2630 | const char *fmt); |
74bedc4d | 2631 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
2632 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
2633 | size_t len, loff_t *ppos); | |
2634 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
2635 | size_t len, loff_t *ppos); | |
2636 | ||
4be28540 | 2637 | struct ctl_table; |
8d65af78 | 2638 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 2639 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
2640 | int proc_nr_dentry(struct ctl_table *table, int write, |
2641 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
2642 | int proc_nr_inodes(struct ctl_table *table, int write, |
2643 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 2644 | int __init get_filesystem_list(char *buf); |
62239ac2 | 2645 | |
3cd90ea4 | 2646 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
2647 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
2648 | ||
6d125529 | 2649 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 2650 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 2651 | (flag & __FMODE_NONOTIFY))) |
5300990c | 2652 | |
8d334acd | 2653 | static inline int is_sxid(umode_t mode) |
69b45732 AK |
2654 | { |
2655 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
2656 | } | |
2657 | ||
2658 | static inline void inode_has_no_xattr(struct inode *inode) | |
2659 | { | |
9e1f1de0 | 2660 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
69b45732 AK |
2661 | inode->i_flags |= S_NOSEC; |
2662 | } | |
2663 | ||
1da177e4 LT |
2664 | #endif /* __KERNEL__ */ |
2665 | #endif /* _LINUX_FS_H */ |