Commit | Line | Data |
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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) |
6a8a13e0 BS |
95 | /* 32bit hashes as llseek() offset (for directories) */ |
96 | #define FMODE_32BITHASH ((__force fmode_t)0x200) | |
97 | /* 64bit hashes as llseek() offset (for directories) */ | |
98 | #define FMODE_64BITHASH ((__force fmode_t)0x400) | |
b500531e | 99 | |
4d4be482 CH |
100 | /* |
101 | * Don't update ctime and mtime. | |
102 | * | |
103 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll | |
104 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. | |
105 | */ | |
19adf9c5 | 106 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
4d4be482 | 107 | |
0141450f | 108 | /* Expect random access pattern */ |
19adf9c5 | 109 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
0141450f | 110 | |
4a3956c7 KH |
111 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
112 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) | |
113 | ||
1abf0c71 AV |
114 | /* File is opened with O_PATH; almost nothing can be done with it */ |
115 | #define FMODE_PATH ((__force fmode_t)0x4000) | |
116 | ||
ecf081d1 | 117 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
13bcbc00 | 118 | #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) |
ecf081d1 | 119 | |
48e70bc1 JA |
120 | /* |
121 | * The below are the various read and write types that we support. Some of | |
122 | * them include behavioral modifiers that send information down to the | |
123 | * block layer and IO scheduler. Terminology: | |
124 | * | |
125 | * The block layer uses device plugging to defer IO a little bit, in | |
126 | * the hope that we will see more IO very shortly. This increases | |
127 | * coalescing of adjacent IO and thus reduces the number of IOs we | |
128 | * have to send to the device. It also allows for better queuing, | |
129 | * if the IO isn't mergeable. If the caller is going to be waiting | |
130 | * for the IO, then he must ensure that the device is unplugged so | |
131 | * that the IO is dispatched to the driver. | |
132 | * | |
133 | * All IO is handled async in Linux. This is fine for background | |
134 | * writes, but for reads or writes that someone waits for completion | |
135 | * on, we want to notify the block layer and IO scheduler so that they | |
136 | * know about it. That allows them to make better scheduling | |
137 | * decisions. So when the below references 'sync' and 'async', it | |
138 | * is referencing this priority hint. | |
139 | * | |
140 | * With that in mind, the available types are: | |
141 | * | |
142 | * READ A normal read operation. Device will be plugged. | |
143 | * READ_SYNC A synchronous read. Device is not plugged, caller can | |
144 | * immediately wait on this read without caring about | |
145 | * unplugging. | |
146 | * READA Used for read-ahead operations. Lower priority, and the | |
7cc01581 | 147 | * block layer could (in theory) choose to ignore this |
48e70bc1 JA |
148 | * request if it runs into resource problems. |
149 | * WRITE A normal async write. Device will be plugged. | |
721a9602 | 150 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
48e70bc1 | 151 | * the hint that someone will be waiting on this IO |
721a9602 JA |
152 | * shortly. The write equivalent of READ_SYNC. |
153 | * WRITE_ODIRECT Special case write for O_DIRECT only. | |
4fed947c TH |
154 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
155 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on | |
156 | * non-volatile media on completion. | |
157 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded | |
158 | * by a cache flush and data is guaranteed to be on | |
159 | * non-volatile media on completion. | |
48e70bc1 JA |
160 | * |
161 | */ | |
7cc01581 TH |
162 | #define RW_MASK REQ_WRITE |
163 | #define RWA_MASK REQ_RAHEAD | |
7b6d91da CH |
164 | |
165 | #define READ 0 | |
7cc01581 TH |
166 | #define WRITE RW_MASK |
167 | #define READA RWA_MASK | |
18022c5d MG |
168 | #define KERNEL_READ (READ|REQ_KERNEL) |
169 | #define KERNEL_WRITE (WRITE|REQ_KERNEL) | |
7b6d91da | 170 | |
721a9602 | 171 | #define READ_SYNC (READ | REQ_SYNC) |
721a9602 JA |
172 | #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
173 | #define WRITE_ODIRECT (WRITE | REQ_SYNC) | |
721a9602 JA |
174 | #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
175 | #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) | |
176 | #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) | |
1da177e4 | 177 | |
ac34ebb3 CY |
178 | |
179 | /* | |
180 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector | |
181 | * that indicates that they should check the contents of the iovec are | |
182 | * valid, but not check the memory that the iovec elements | |
183 | * points too. | |
184 | */ | |
185 | #define CHECK_IOVEC_ONLY -1 | |
186 | ||
1da177e4 LT |
187 | #define SEL_IN 1 |
188 | #define SEL_OUT 2 | |
189 | #define SEL_EX 4 | |
190 | ||
191 | /* public flags for file_system_type */ | |
192 | #define FS_REQUIRES_DEV 1 | |
193 | #define FS_BINARY_MOUNTDATA 2 | |
79c0b2df | 194 | #define FS_HAS_SUBTYPE 4 |
1da177e4 | 195 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
349457cc MF |
196 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
197 | * during rename() internally. | |
198 | */ | |
199 | ||
1da177e4 LT |
200 | /* |
201 | * These are the fs-independent mount-flags: up to 32 flags are supported | |
202 | */ | |
203 | #define MS_RDONLY 1 /* Mount read-only */ | |
204 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |
205 | #define MS_NODEV 4 /* Disallow access to device special files */ | |
206 | #define MS_NOEXEC 8 /* Disallow program execution */ | |
207 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ | |
208 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ | |
209 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
210 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ | |
211 | #define MS_NOATIME 1024 /* Do not update access times. */ | |
212 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ | |
213 | #define MS_BIND 4096 | |
214 | #define MS_MOVE 8192 | |
215 | #define MS_REC 16384 | |
9b04c997 TT |
216 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
217 | MS_VERBOSE is deprecated. */ | |
218 | #define MS_SILENT 32768 | |
bf066c7d | 219 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
9676f0c6 | 220 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
07b20889 | 221 | #define MS_PRIVATE (1<<18) /* change to private */ |
a58b0eb8 | 222 | #define MS_SLAVE (1<<19) /* change to slave */ |
03e06e68 | 223 | #define MS_SHARED (1<<20) /* change to shared */ |
47ae32d6 | 224 | #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ |
8bf9725c | 225 | #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ |
7a224228 | 226 | #define MS_I_VERSION (1<<23) /* Update inode I_version field */ |
d0adde57 | 227 | #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ |
9e1f1de0 | 228 | #define MS_NOSEC (1<<28) |
7a4dec53 | 229 | #define MS_BORN (1<<29) |
1da177e4 LT |
230 | #define MS_ACTIVE (1<<30) |
231 | #define MS_NOUSER (1<<31) | |
232 | ||
233 | /* | |
234 | * Superblock flags that can be altered by MS_REMOUNT | |
235 | */ | |
08b9fe6b | 236 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) |
1da177e4 LT |
237 | |
238 | /* | |
239 | * Old magic mount flag and mask | |
240 | */ | |
241 | #define MS_MGC_VAL 0xC0ED0000 | |
242 | #define MS_MGC_MSK 0xffff0000 | |
243 | ||
244 | /* Inode flags - they have nothing to superblock flags now */ | |
245 | ||
246 | #define S_SYNC 1 /* Writes are synced at once */ | |
247 | #define S_NOATIME 2 /* Do not update access times */ | |
248 | #define S_APPEND 4 /* Append-only file */ | |
249 | #define S_IMMUTABLE 8 /* Immutable file */ | |
250 | #define S_DEAD 16 /* removed, but still open directory */ | |
251 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
252 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
253 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
254 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
255 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
196f5181 | 256 | #define S_IMA 1024 /* Inode has an associated IMA struct */ |
9875cf80 | 257 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
69b45732 | 258 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
1da177e4 LT |
259 | |
260 | /* | |
261 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
262 | * flags just means all the inodes inherit those flags by default. It might be | |
263 | * possible to override it selectively if you really wanted to with some | |
264 | * ioctl() that is not currently implemented. | |
265 | * | |
266 | * Exception: MS_RDONLY is always applied to the entire file system. | |
267 | * | |
268 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
269 | * with files in use. This means that all of the inodes will not have their | |
270 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
271 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
272 | */ | |
273 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) | |
274 | ||
275 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
276 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
277 | ((inode)->i_flags & S_SYNC)) | |
278 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
279 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
280 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
37756ced | 281 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
7a224228 | 282 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
1da177e4 LT |
283 | |
284 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
285 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
286 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
287 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
288 | ||
289 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
290 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
291 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
292 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
196f5181 | 293 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
9875cf80 | 294 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
69b45732 | 295 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
1da177e4 LT |
296 | |
297 | /* the read-only stuff doesn't really belong here, but any other place is | |
298 | probably as bad and I don't want to create yet another include file. */ | |
299 | ||
300 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ | |
301 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ | |
302 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ | |
303 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ | |
304 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ | |
305 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ | |
306 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ | |
307 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ | |
308 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ | |
309 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ | |
310 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ | |
311 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ | |
312 | #if 0 | |
313 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ | |
314 | ||
315 | /* Some people are morons. Do not use sizeof! */ | |
316 | ||
317 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ | |
318 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ | |
319 | /* This was here just to show that the number is taken - | |
320 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ | |
321 | #endif | |
322 | /* A jump here: 108-111 have been used for various private purposes. */ | |
323 | #define BLKBSZGET _IOR(0x12,112,size_t) | |
324 | #define BLKBSZSET _IOW(0x12,113,size_t) | |
325 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
2056a782 JA |
326 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
327 | #define BLKTRACESTART _IO(0x12,116) | |
328 | #define BLKTRACESTOP _IO(0x12,117) | |
329 | #define BLKTRACETEARDOWN _IO(0x12,118) | |
d30a2605 | 330 | #define BLKDISCARD _IO(0x12,119) |
ac481c20 MP |
331 | #define BLKIOMIN _IO(0x12,120) |
332 | #define BLKIOOPT _IO(0x12,121) | |
333 | #define BLKALIGNOFF _IO(0x12,122) | |
334 | #define BLKPBSZGET _IO(0x12,123) | |
98262f27 | 335 | #define BLKDISCARDZEROES _IO(0x12,124) |
8d57a98c | 336 | #define BLKSECDISCARD _IO(0x12,125) |
ef00f59c | 337 | #define BLKROTATIONAL _IO(0x12,126) |
1da177e4 LT |
338 | |
339 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ | |
340 | #define FIBMAP _IO(0x00,1) /* bmap access */ | |
341 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ | |
fcccf502 TS |
342 | #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ |
343 | #define FITHAW _IOWR('X', 120, int) /* Thaw */ | |
367a51a3 | 344 | #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ |
1da177e4 | 345 | |
36695673 DH |
346 | #define FS_IOC_GETFLAGS _IOR('f', 1, long) |
347 | #define FS_IOC_SETFLAGS _IOW('f', 2, long) | |
348 | #define FS_IOC_GETVERSION _IOR('v', 1, long) | |
349 | #define FS_IOC_SETVERSION _IOW('v', 2, long) | |
c4b929b8 | 350 | #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) |
36695673 DH |
351 | #define FS_IOC32_GETFLAGS _IOR('f', 1, int) |
352 | #define FS_IOC32_SETFLAGS _IOW('f', 2, int) | |
353 | #define FS_IOC32_GETVERSION _IOR('v', 1, int) | |
354 | #define FS_IOC32_SETVERSION _IOW('v', 2, int) | |
355 | ||
356 | /* | |
357 | * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) | |
358 | */ | |
359 | #define FS_SECRM_FL 0x00000001 /* Secure deletion */ | |
360 | #define FS_UNRM_FL 0x00000002 /* Undelete */ | |
361 | #define FS_COMPR_FL 0x00000004 /* Compress file */ | |
362 | #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ | |
363 | #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
364 | #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ | |
365 | #define FS_NODUMP_FL 0x00000040 /* do not dump file */ | |
366 | #define FS_NOATIME_FL 0x00000080 /* do not update atime */ | |
367 | /* Reserved for compression usage... */ | |
368 | #define FS_DIRTY_FL 0x00000100 | |
369 | #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
370 | #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ | |
371 | #define FS_ECOMPR_FL 0x00000800 /* Compression error */ | |
372 | /* End compression flags --- maybe not all used */ | |
373 | #define FS_BTREE_FL 0x00001000 /* btree format dir */ | |
374 | #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ | |
375 | #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ | |
376 | #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ | |
377 | #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
378 | #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
379 | #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
128e5eba SW |
380 | #define FS_EXTENT_FL 0x00080000 /* Extents */ |
381 | #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ | |
32471f6e | 382 | #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ |
36695673 DH |
383 | #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
384 | ||
385 | #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ | |
386 | #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ | |
387 | ||
388 | ||
e46e4903 AM |
389 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
390 | #define SYNC_FILE_RANGE_WRITE 2 | |
391 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 | |
392 | ||
1da177e4 LT |
393 | #ifdef __KERNEL__ |
394 | ||
395 | #include <linux/linkage.h> | |
396 | #include <linux/wait.h> | |
1da177e4 LT |
397 | #include <linux/kdev_t.h> |
398 | #include <linux/dcache.h> | |
3f8206d4 | 399 | #include <linux/path.h> |
1da177e4 LT |
400 | #include <linux/stat.h> |
401 | #include <linux/cache.h> | |
1da177e4 LT |
402 | #include <linux/list.h> |
403 | #include <linux/radix-tree.h> | |
404 | #include <linux/prio_tree.h> | |
405 | #include <linux/init.h> | |
914e2637 | 406 | #include <linux/pid.h> |
187f1882 | 407 | #include <linux/bug.h> |
1b1dcc1b | 408 | #include <linux/mutex.h> |
3bd858ab | 409 | #include <linux/capability.h> |
6188e10d | 410 | #include <linux/semaphore.h> |
c4b929b8 | 411 | #include <linux/fiemap.h> |
ceb5bdc2 | 412 | #include <linux/rculist_bl.h> |
07b8ce1e | 413 | #include <linux/atomic.h> |
83aeeada | 414 | #include <linux/shrinker.h> |
c1aab02d | 415 | #include <linux/migrate_mode.h> |
92361636 | 416 | #include <linux/uidgid.h> |
5accdf82 | 417 | #include <linux/lockdep.h> |
1da177e4 | 418 | |
1da177e4 LT |
419 | #include <asm/byteorder.h> |
420 | ||
a5694255 | 421 | struct export_operations; |
a885c8c4 | 422 | struct hd_geometry; |
1da177e4 LT |
423 | struct iovec; |
424 | struct nameidata; | |
92198f7e | 425 | struct kiocb; |
57cc7215 | 426 | struct kobject; |
1da177e4 LT |
427 | struct pipe_inode_info; |
428 | struct poll_table_struct; | |
429 | struct kstatfs; | |
430 | struct vm_area_struct; | |
431 | struct vfsmount; | |
745ca247 | 432 | struct cred; |
a509bc1a | 433 | struct swap_info_struct; |
1da177e4 | 434 | |
74bf17cf | 435 | extern void __init inode_init(void); |
1da177e4 | 436 | extern void __init inode_init_early(void); |
1da177e4 LT |
437 | extern void __init files_init(unsigned long); |
438 | ||
dded4f4d | 439 | extern struct files_stat_struct files_stat; |
518de9b3 | 440 | extern unsigned long get_max_files(void); |
dded4f4d JE |
441 | extern int sysctl_nr_open; |
442 | extern struct inodes_stat_t inodes_stat; | |
443 | extern int leases_enable, lease_break_time; | |
800179c9 KC |
444 | extern int sysctl_protected_symlinks; |
445 | extern int sysctl_protected_hardlinks; | |
dded4f4d | 446 | |
1da177e4 LT |
447 | struct buffer_head; |
448 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
449 | struct buffer_head *bh_result, int create); | |
92198f7e | 450 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
40e2e973 CH |
451 | ssize_t bytes, void *private, int ret, |
452 | bool is_async); | |
1da177e4 LT |
453 | |
454 | /* | |
455 | * Attribute flags. These should be or-ed together to figure out what | |
456 | * has been changed! | |
457 | */ | |
9767d749 MS |
458 | #define ATTR_MODE (1 << 0) |
459 | #define ATTR_UID (1 << 1) | |
460 | #define ATTR_GID (1 << 2) | |
461 | #define ATTR_SIZE (1 << 3) | |
462 | #define ATTR_ATIME (1 << 4) | |
463 | #define ATTR_MTIME (1 << 5) | |
464 | #define ATTR_CTIME (1 << 6) | |
465 | #define ATTR_ATIME_SET (1 << 7) | |
466 | #define ATTR_MTIME_SET (1 << 8) | |
467 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
468 | #define ATTR_ATTR_FLAG (1 << 10) | |
469 | #define ATTR_KILL_SUID (1 << 11) | |
470 | #define ATTR_KILL_SGID (1 << 12) | |
471 | #define ATTR_FILE (1 << 13) | |
472 | #define ATTR_KILL_PRIV (1 << 14) | |
473 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
474 | #define ATTR_TIMES_SET (1 << 16) | |
1da177e4 LT |
475 | |
476 | /* | |
477 | * This is the Inode Attributes structure, used for notify_change(). It | |
478 | * uses the above definitions as flags, to know which values have changed. | |
479 | * Also, in this manner, a Filesystem can look at only the values it cares | |
480 | * about. Basically, these are the attributes that the VFS layer can | |
481 | * request to change from the FS layer. | |
482 | * | |
483 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
484 | */ | |
485 | struct iattr { | |
486 | unsigned int ia_valid; | |
487 | umode_t ia_mode; | |
92361636 EB |
488 | kuid_t ia_uid; |
489 | kgid_t ia_gid; | |
1da177e4 LT |
490 | loff_t ia_size; |
491 | struct timespec ia_atime; | |
492 | struct timespec ia_mtime; | |
493 | struct timespec ia_ctime; | |
cc4e69de MS |
494 | |
495 | /* | |
25985edc | 496 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
497 | * implement an ftruncate() like method. NOTE: filesystem should |
498 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
499 | */ | |
500 | struct file *ia_file; | |
1da177e4 LT |
501 | }; |
502 | ||
1da177e4 LT |
503 | /* |
504 | * Includes for diskquotas. | |
505 | */ | |
506 | #include <linux/quota.h> | |
507 | ||
994fc28c ZB |
508 | /** |
509 | * enum positive_aop_returns - aop return codes with specific semantics | |
510 | * | |
511 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
512 | * completed, that the page is still locked, and | |
513 | * should be considered active. The VM uses this hint | |
514 | * to return the page to the active list -- it won't | |
515 | * be a candidate for writeback again in the near | |
516 | * future. Other callers must be careful to unlock | |
517 | * the page if they get this return. Returned by | |
518 | * writepage(); | |
519 | * | |
520 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
521 | * unlocked it and the page might have been truncated. | |
522 | * The caller should back up to acquiring a new page and | |
523 | * trying again. The aop will be taking reasonable | |
524 | * precautions not to livelock. If the caller held a page | |
525 | * reference, it should drop it before retrying. Returned | |
55144768 | 526 | * by readpage(). |
994fc28c ZB |
527 | * |
528 | * address_space_operation functions return these large constants to indicate | |
529 | * special semantics to the caller. These are much larger than the bytes in a | |
530 | * page to allow for functions that return the number of bytes operated on in a | |
531 | * given page. | |
532 | */ | |
533 | ||
534 | enum positive_aop_returns { | |
535 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
536 | AOP_TRUNCATED_PAGE = 0x80001, | |
537 | }; | |
538 | ||
afddba49 | 539 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
89e10787 | 540 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
54566b2c NP |
541 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
542 | * helper code (eg buffer layer) | |
543 | * to clear GFP_FS from alloc */ | |
afddba49 | 544 | |
1da177e4 LT |
545 | /* |
546 | * oh the beauties of C type declarations. | |
547 | */ | |
548 | struct page; | |
549 | struct address_space; | |
550 | struct writeback_control; | |
1da177e4 | 551 | |
2f718ffc NP |
552 | struct iov_iter { |
553 | const struct iovec *iov; | |
554 | unsigned long nr_segs; | |
555 | size_t iov_offset; | |
556 | size_t count; | |
557 | }; | |
558 | ||
559 | size_t iov_iter_copy_from_user_atomic(struct page *page, | |
560 | struct iov_iter *i, unsigned long offset, size_t bytes); | |
561 | size_t iov_iter_copy_from_user(struct page *page, | |
562 | struct iov_iter *i, unsigned long offset, size_t bytes); | |
563 | void iov_iter_advance(struct iov_iter *i, size_t bytes); | |
afddba49 | 564 | int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); |
2f718ffc NP |
565 | size_t iov_iter_single_seg_count(struct iov_iter *i); |
566 | ||
567 | static inline void iov_iter_init(struct iov_iter *i, | |
568 | const struct iovec *iov, unsigned long nr_segs, | |
569 | size_t count, size_t written) | |
570 | { | |
571 | i->iov = iov; | |
572 | i->nr_segs = nr_segs; | |
573 | i->iov_offset = 0; | |
574 | i->count = count + written; | |
575 | ||
576 | iov_iter_advance(i, written); | |
577 | } | |
578 | ||
579 | static inline size_t iov_iter_count(struct iov_iter *i) | |
580 | { | |
581 | return i->count; | |
582 | } | |
583 | ||
8ab22b9a HH |
584 | /* |
585 | * "descriptor" for what we're up to with a read. | |
586 | * This allows us to use the same read code yet | |
587 | * have multiple different users of the data that | |
588 | * we read from a file. | |
589 | * | |
590 | * The simplest case just copies the data to user | |
591 | * mode. | |
592 | */ | |
593 | typedef struct { | |
594 | size_t written; | |
595 | size_t count; | |
596 | union { | |
597 | char __user *buf; | |
598 | void *data; | |
599 | } arg; | |
600 | int error; | |
601 | } read_descriptor_t; | |
602 | ||
603 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
604 | unsigned long, unsigned long); | |
2f718ffc | 605 | |
1da177e4 LT |
606 | struct address_space_operations { |
607 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
608 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
609 | |
610 | /* Write back some dirty pages from this mapping. */ | |
611 | int (*writepages)(struct address_space *, struct writeback_control *); | |
612 | ||
4741c9fd | 613 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
614 | int (*set_page_dirty)(struct page *page); |
615 | ||
616 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
617 | struct list_head *pages, unsigned nr_pages); | |
618 | ||
afddba49 NP |
619 | int (*write_begin)(struct file *, struct address_space *mapping, |
620 | loff_t pos, unsigned len, unsigned flags, | |
621 | struct page **pagep, void **fsdata); | |
622 | int (*write_end)(struct file *, struct address_space *mapping, | |
623 | loff_t pos, unsigned len, unsigned copied, | |
624 | struct page *page, void *fsdata); | |
625 | ||
1da177e4 LT |
626 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
627 | sector_t (*bmap)(struct address_space *, sector_t); | |
2ff28e22 | 628 | void (*invalidatepage) (struct page *, unsigned long); |
27496a8c | 629 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 630 | void (*freepage)(struct page *); |
1da177e4 LT |
631 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
632 | loff_t offset, unsigned long nr_segs); | |
70688e4d NP |
633 | int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
634 | void **, unsigned long *); | |
b969c4ab MG |
635 | /* |
636 | * migrate the contents of a page to the specified target. If sync | |
637 | * is false, it must not block. | |
638 | */ | |
2d1db3b1 | 639 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 640 | struct page *, struct page *, enum migrate_mode); |
e3db7691 | 641 | int (*launder_page) (struct page *); |
8ab22b9a HH |
642 | int (*is_partially_uptodate) (struct page *, read_descriptor_t *, |
643 | unsigned long); | |
25718736 | 644 | int (*error_remove_page)(struct address_space *, struct page *); |
62c230bc MG |
645 | |
646 | /* swapfile support */ | |
a509bc1a MG |
647 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
648 | sector_t *span); | |
649 | void (*swap_deactivate)(struct file *file); | |
1da177e4 LT |
650 | }; |
651 | ||
7dcda1c9 JA |
652 | extern const struct address_space_operations empty_aops; |
653 | ||
afddba49 NP |
654 | /* |
655 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
656 | * to write into the pagecache. | |
657 | */ | |
658 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
659 | loff_t pos, unsigned len, unsigned flags, | |
660 | struct page **pagep, void **fsdata); | |
661 | ||
662 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
663 | loff_t pos, unsigned len, unsigned copied, | |
664 | struct page *page, void *fsdata); | |
665 | ||
1da177e4 LT |
666 | struct backing_dev_info; |
667 | struct address_space { | |
668 | struct inode *host; /* owner: inode, block_device */ | |
669 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
19fd6231 | 670 | spinlock_t tree_lock; /* and lock protecting it */ |
1da177e4 LT |
671 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
672 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ | |
673 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ | |
3d48ae45 | 674 | struct mutex i_mmap_mutex; /* protect tree, count, list */ |
08142579 | 675 | /* Protected by tree_lock together with the radix tree */ |
1da177e4 LT |
676 | unsigned long nrpages; /* number of total pages */ |
677 | pgoff_t writeback_index;/* writeback starts here */ | |
f5e54d6e | 678 | const struct address_space_operations *a_ops; /* methods */ |
1da177e4 LT |
679 | unsigned long flags; /* error bits/gfp mask */ |
680 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ | |
681 | spinlock_t private_lock; /* for use by the address_space */ | |
682 | struct list_head private_list; /* ditto */ | |
683 | struct address_space *assoc_mapping; /* ditto */ | |
684 | } __attribute__((aligned(sizeof(long)))); | |
685 | /* | |
686 | * On most architectures that alignment is already the case; but | |
25985edc | 687 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
688 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
689 | */ | |
87192a2a | 690 | struct request_queue; |
1da177e4 LT |
691 | |
692 | struct block_device { | |
693 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 694 | int bd_openers; |
1da177e4 | 695 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 696 | struct super_block * bd_super; |
c039e313 | 697 | struct mutex bd_mutex; /* open/close mutex */ |
1da177e4 | 698 | struct list_head bd_inodes; |
6b4517a7 | 699 | void * bd_claiming; |
1da177e4 LT |
700 | void * bd_holder; |
701 | int bd_holders; | |
77ea887e | 702 | bool bd_write_holder; |
641dc636 | 703 | #ifdef CONFIG_SYSFS |
49731baa | 704 | struct list_head bd_holder_disks; |
641dc636 | 705 | #endif |
1da177e4 LT |
706 | struct block_device * bd_contains; |
707 | unsigned bd_block_size; | |
708 | struct hd_struct * bd_part; | |
709 | /* number of times partitions within this device have been opened. */ | |
710 | unsigned bd_part_count; | |
711 | int bd_invalidated; | |
712 | struct gendisk * bd_disk; | |
87192a2a | 713 | struct request_queue * bd_queue; |
1da177e4 | 714 | struct list_head bd_list; |
1da177e4 LT |
715 | /* |
716 | * Private data. You must have bd_claim'ed the block_device | |
717 | * to use this. NOTE: bd_claim allows an owner to claim | |
718 | * the same device multiple times, the owner must take special | |
719 | * care to not mess up bd_private for that case. | |
720 | */ | |
721 | unsigned long bd_private; | |
fcccf502 TS |
722 | |
723 | /* The counter of freeze processes */ | |
724 | int bd_fsfreeze_count; | |
725 | /* Mutex for freeze */ | |
726 | struct mutex bd_fsfreeze_mutex; | |
1da177e4 LT |
727 | }; |
728 | ||
729 | /* | |
730 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
731 | * radix trees | |
732 | */ | |
733 | #define PAGECACHE_TAG_DIRTY 0 | |
734 | #define PAGECACHE_TAG_WRITEBACK 1 | |
f446daae | 735 | #define PAGECACHE_TAG_TOWRITE 2 |
1da177e4 LT |
736 | |
737 | int mapping_tagged(struct address_space *mapping, int tag); | |
738 | ||
739 | /* | |
740 | * Might pages of this file be mapped into userspace? | |
741 | */ | |
742 | static inline int mapping_mapped(struct address_space *mapping) | |
743 | { | |
744 | return !prio_tree_empty(&mapping->i_mmap) || | |
745 | !list_empty(&mapping->i_mmap_nonlinear); | |
746 | } | |
747 | ||
748 | /* | |
749 | * Might pages of this file have been modified in userspace? | |
750 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
751 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
752 | * writing i.e. vma may be mprotected writable even if now readonly. | |
753 | */ | |
754 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
755 | { | |
756 | return mapping->i_mmap_writable != 0; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
761 | */ | |
762 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
763 | #include <linux/seqlock.h> | |
764 | #define __NEED_I_SIZE_ORDERED | |
765 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
766 | #else | |
767 | #define i_size_ordered_init(inode) do { } while (0) | |
768 | #endif | |
769 | ||
f19d4a8f AV |
770 | struct posix_acl; |
771 | #define ACL_NOT_CACHED ((void *)(-1)) | |
772 | ||
3ddcd056 LT |
773 | #define IOP_FASTPERM 0x0001 |
774 | #define IOP_LOOKUP 0x0002 | |
775 | #define IOP_NOFOLLOW 0x0004 | |
776 | ||
777 | /* | |
778 | * Keep mostly read-only and often accessed (especially for | |
779 | * the RCU path lookup and 'stat' data) fields at the beginning | |
780 | * of the 'struct inode' | |
781 | */ | |
1da177e4 | 782 | struct inode { |
44a7d7a8 | 783 | umode_t i_mode; |
3ddcd056 | 784 | unsigned short i_opflags; |
92361636 EB |
785 | kuid_t i_uid; |
786 | kgid_t i_gid; | |
3ddcd056 LT |
787 | unsigned int i_flags; |
788 | ||
789 | #ifdef CONFIG_FS_POSIX_ACL | |
790 | struct posix_acl *i_acl; | |
791 | struct posix_acl *i_default_acl; | |
792 | #endif | |
793 | ||
44a7d7a8 NP |
794 | const struct inode_operations *i_op; |
795 | struct super_block *i_sb; | |
3ddcd056 | 796 | struct address_space *i_mapping; |
44a7d7a8 | 797 | |
13e12d14 LT |
798 | #ifdef CONFIG_SECURITY |
799 | void *i_security; | |
800 | #endif | |
44a7d7a8 | 801 | |
3ddcd056 LT |
802 | /* Stat data, not accessed from path walking */ |
803 | unsigned long i_ino; | |
a78ef704 MS |
804 | /* |
805 | * Filesystems may only read i_nlink directly. They shall use the | |
806 | * following functions for modification: | |
807 | * | |
808 | * (set|clear|inc|drop)_nlink | |
809 | * inode_(inc|dec)_link_count | |
810 | */ | |
811 | union { | |
812 | const unsigned int i_nlink; | |
813 | unsigned int __i_nlink; | |
814 | }; | |
3ddcd056 | 815 | dev_t i_rdev; |
2f9d3df8 | 816 | loff_t i_size; |
3ddcd056 LT |
817 | struct timespec i_atime; |
818 | struct timespec i_mtime; | |
819 | struct timespec i_ctime; | |
6cdbb0ef TT |
820 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
821 | unsigned short i_bytes; | |
2f9d3df8 | 822 | unsigned int i_blkbits; |
3ddcd056 LT |
823 | blkcnt_t i_blocks; |
824 | ||
825 | #ifdef __NEED_I_SIZE_ORDERED | |
826 | seqcount_t i_size_seqcount; | |
827 | #endif | |
828 | ||
829 | /* Misc */ | |
830 | unsigned long i_state; | |
3ddcd056 | 831 | struct mutex i_mutex; |
13e12d14 | 832 | |
44a7d7a8 NP |
833 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
834 | ||
1da177e4 | 835 | struct hlist_node i_hash; |
7ccf19a8 NP |
836 | struct list_head i_wb_list; /* backing dev IO list */ |
837 | struct list_head i_lru; /* inode LRU list */ | |
1da177e4 | 838 | struct list_head i_sb_list; |
fa0d7e3d | 839 | union { |
b3d9b7a3 | 840 | struct hlist_head i_dentry; |
fa0d7e3d NP |
841 | struct rcu_head i_rcu; |
842 | }; | |
7a224228 | 843 | u64 i_version; |
2f9d3df8 | 844 | atomic_t i_count; |
bd5fe6c5 | 845 | atomic_t i_dio_count; |
6cdbb0ef | 846 | atomic_t i_writecount; |
99ac48f5 | 847 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
1da177e4 | 848 | struct file_lock *i_flock; |
1da177e4 LT |
849 | struct address_space i_data; |
850 | #ifdef CONFIG_QUOTA | |
851 | struct dquot *i_dquot[MAXQUOTAS]; | |
852 | #endif | |
1da177e4 | 853 | struct list_head i_devices; |
4c154168 TT |
854 | union { |
855 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 856 | struct block_device *i_bdev; |
577c4eb0 | 857 | struct cdev *i_cdev; |
4c154168 | 858 | }; |
1da177e4 LT |
859 | |
860 | __u32 i_generation; | |
861 | ||
3be25f49 EP |
862 | #ifdef CONFIG_FSNOTIFY |
863 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
e61ce867 | 864 | struct hlist_head i_fsnotify_marks; |
0eeca283 RL |
865 | #endif |
866 | ||
a178d202 | 867 | #ifdef CONFIG_IMA |
a68a27b6 | 868 | atomic_t i_readcount; /* struct files open RO */ |
a178d202 | 869 | #endif |
8e18e294 | 870 | void *i_private; /* fs or device private pointer */ |
1da177e4 LT |
871 | }; |
872 | ||
1d3382cb AV |
873 | static inline int inode_unhashed(struct inode *inode) |
874 | { | |
875 | return hlist_unhashed(&inode->i_hash); | |
876 | } | |
877 | ||
f2eace23 IM |
878 | /* |
879 | * inode->i_mutex nesting subclasses for the lock validator: | |
880 | * | |
881 | * 0: the object of the current VFS operation | |
882 | * 1: parent | |
883 | * 2: child/target | |
884 | * 3: quota file | |
885 | * | |
886 | * The locking order between these classes is | |
4df46240 | 887 | * parent -> child -> normal -> xattr -> quota |
f2eace23 IM |
888 | */ |
889 | enum inode_i_mutex_lock_class | |
890 | { | |
891 | I_MUTEX_NORMAL, | |
892 | I_MUTEX_PARENT, | |
893 | I_MUTEX_CHILD, | |
4df46240 | 894 | I_MUTEX_XATTR, |
f2eace23 IM |
895 | I_MUTEX_QUOTA |
896 | }; | |
897 | ||
1da177e4 LT |
898 | /* |
899 | * NOTE: in a 32bit arch with a preemptable kernel and | |
900 | * an UP compile the i_size_read/write must be atomic | |
901 | * with respect to the local cpu (unlike with preempt disabled), | |
902 | * but they don't need to be atomic with respect to other cpus like in | |
903 | * true SMP (so they need either to either locally disable irq around | |
904 | * the read or for example on x86 they can be still implemented as a | |
905 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
906 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
907 | */ | |
48ed214d | 908 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
909 | { |
910 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
911 | loff_t i_size; | |
912 | unsigned int seq; | |
913 | ||
914 | do { | |
915 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
916 | i_size = inode->i_size; | |
917 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
918 | return i_size; | |
919 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
920 | loff_t i_size; | |
921 | ||
922 | preempt_disable(); | |
923 | i_size = inode->i_size; | |
924 | preempt_enable(); | |
925 | return i_size; | |
926 | #else | |
927 | return inode->i_size; | |
928 | #endif | |
929 | } | |
930 | ||
7762f5a0 MS |
931 | /* |
932 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
933 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
934 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
935 | */ | |
1da177e4 LT |
936 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
937 | { | |
938 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
939 | write_seqcount_begin(&inode->i_size_seqcount); | |
940 | inode->i_size = i_size; | |
941 | write_seqcount_end(&inode->i_size_seqcount); | |
942 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
943 | preempt_disable(); | |
944 | inode->i_size = i_size; | |
945 | preempt_enable(); | |
946 | #else | |
947 | inode->i_size = i_size; | |
948 | #endif | |
949 | } | |
950 | ||
92361636 EB |
951 | /* Helper functions so that in most cases filesystems will |
952 | * not need to deal directly with kuid_t and kgid_t and can | |
953 | * instead deal with the raw numeric values that are stored | |
954 | * in the filesystem. | |
955 | */ | |
956 | static inline uid_t i_uid_read(const struct inode *inode) | |
957 | { | |
958 | return from_kuid(&init_user_ns, inode->i_uid); | |
959 | } | |
960 | ||
961 | static inline gid_t i_gid_read(const struct inode *inode) | |
962 | { | |
963 | return from_kgid(&init_user_ns, inode->i_gid); | |
964 | } | |
965 | ||
966 | static inline void i_uid_write(struct inode *inode, uid_t uid) | |
967 | { | |
968 | inode->i_uid = make_kuid(&init_user_ns, uid); | |
969 | } | |
970 | ||
971 | static inline void i_gid_write(struct inode *inode, gid_t gid) | |
972 | { | |
973 | inode->i_gid = make_kgid(&init_user_ns, gid); | |
974 | } | |
975 | ||
48ed214d | 976 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
977 | { |
978 | return MINOR(inode->i_rdev); | |
979 | } | |
980 | ||
48ed214d | 981 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
982 | { |
983 | return MAJOR(inode->i_rdev); | |
984 | } | |
985 | ||
986 | extern struct block_device *I_BDEV(struct inode *inode); | |
987 | ||
988 | struct fown_struct { | |
989 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
990 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
991 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
92361636 | 992 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
993 | int signum; /* posix.1b rt signal to be delivered on IO */ |
994 | }; | |
995 | ||
996 | /* | |
997 | * Track a single file's readahead state | |
998 | */ | |
999 | struct file_ra_state { | |
937085aa FW |
1000 | pgoff_t start; /* where readahead started */ |
1001 | unsigned int size; /* # of readahead pages */ | |
1002 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 1003 | there are only # of pages ahead */ |
5ce1110b | 1004 | |
937085aa | 1005 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 1006 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 1007 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 1008 | }; |
1da177e4 | 1009 | |
5ce1110b FW |
1010 | /* |
1011 | * Check if @index falls in the readahead windows. | |
1012 | */ | |
1013 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
1014 | { | |
f9acc8c7 FW |
1015 | return (index >= ra->start && |
1016 | index < ra->start + ra->size); | |
5ce1110b FW |
1017 | } |
1018 | ||
ad775f5a DH |
1019 | #define FILE_MNT_WRITE_TAKEN 1 |
1020 | #define FILE_MNT_WRITE_RELEASED 2 | |
1021 | ||
1da177e4 | 1022 | struct file { |
2f512016 ED |
1023 | /* |
1024 | * fu_list becomes invalid after file_free is called and queued via | |
1025 | * fu_rcuhead for RCU freeing | |
1026 | */ | |
1027 | union { | |
1028 | struct list_head fu_list; | |
1029 | struct rcu_head fu_rcuhead; | |
1030 | } f_u; | |
0f7fc9e4 JJS |
1031 | struct path f_path; |
1032 | #define f_dentry f_path.dentry | |
1033 | #define f_vfsmnt f_path.mnt | |
99ac48f5 | 1034 | const struct file_operations *f_op; |
ef3d0fd2 AK |
1035 | |
1036 | /* | |
1037 | * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR. | |
1038 | * Must not be taken from IRQ context. | |
1039 | */ | |
1040 | spinlock_t f_lock; | |
6416ccb7 NP |
1041 | #ifdef CONFIG_SMP |
1042 | int f_sb_list_cpu; | |
1043 | #endif | |
516e0cc5 | 1044 | atomic_long_t f_count; |
1da177e4 | 1045 | unsigned int f_flags; |
aeb5d727 | 1046 | fmode_t f_mode; |
1da177e4 LT |
1047 | loff_t f_pos; |
1048 | struct fown_struct f_owner; | |
d76b0d9b | 1049 | const struct cred *f_cred; |
1da177e4 LT |
1050 | struct file_ra_state f_ra; |
1051 | ||
2b47c361 | 1052 | u64 f_version; |
50462062 | 1053 | #ifdef CONFIG_SECURITY |
1da177e4 | 1054 | void *f_security; |
50462062 | 1055 | #endif |
1da177e4 LT |
1056 | /* needed for tty driver, and maybe others */ |
1057 | void *private_data; | |
1058 | ||
1059 | #ifdef CONFIG_EPOLL | |
1060 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
1061 | struct list_head f_ep_links; | |
28d82dc1 | 1062 | struct list_head f_tfile_llink; |
1da177e4 LT |
1063 | #endif /* #ifdef CONFIG_EPOLL */ |
1064 | struct address_space *f_mapping; | |
ad775f5a DH |
1065 | #ifdef CONFIG_DEBUG_WRITECOUNT |
1066 | unsigned long f_mnt_write_state; | |
1067 | #endif | |
1da177e4 | 1068 | }; |
1da177e4 | 1069 | |
990d6c2d AK |
1070 | struct file_handle { |
1071 | __u32 handle_bytes; | |
1072 | int handle_type; | |
1073 | /* file identifier */ | |
1074 | unsigned char f_handle[0]; | |
1075 | }; | |
1076 | ||
cb0942b8 AV |
1077 | static inline struct file *get_file(struct file *f) |
1078 | { | |
1079 | atomic_long_inc(&f->f_count); | |
1080 | return f; | |
1081 | } | |
d7065da0 | 1082 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
516e0cc5 | 1083 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 | 1084 | |
ad775f5a DH |
1085 | #ifdef CONFIG_DEBUG_WRITECOUNT |
1086 | static inline void file_take_write(struct file *f) | |
1087 | { | |
1088 | WARN_ON(f->f_mnt_write_state != 0); | |
1089 | f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; | |
1090 | } | |
1091 | static inline void file_release_write(struct file *f) | |
1092 | { | |
1093 | f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; | |
1094 | } | |
1095 | static inline void file_reset_write(struct file *f) | |
1096 | { | |
1097 | f->f_mnt_write_state = 0; | |
1098 | } | |
1099 | static inline void file_check_state(struct file *f) | |
1100 | { | |
1101 | /* | |
1102 | * At this point, either both or neither of these bits | |
1103 | * should be set. | |
1104 | */ | |
1105 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); | |
1106 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); | |
1107 | } | |
1108 | static inline int file_check_writeable(struct file *f) | |
1109 | { | |
1110 | if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) | |
1111 | return 0; | |
1112 | printk(KERN_WARNING "writeable file with no " | |
1113 | "mnt_want_write()\n"); | |
1114 | WARN_ON(1); | |
1115 | return -EINVAL; | |
1116 | } | |
1117 | #else /* !CONFIG_DEBUG_WRITECOUNT */ | |
1118 | static inline void file_take_write(struct file *filp) {} | |
1119 | static inline void file_release_write(struct file *filp) {} | |
1120 | static inline void file_reset_write(struct file *filp) {} | |
1121 | static inline void file_check_state(struct file *filp) {} | |
1122 | static inline int file_check_writeable(struct file *filp) | |
1123 | { | |
1124 | return 0; | |
1125 | } | |
1126 | #endif /* CONFIG_DEBUG_WRITECOUNT */ | |
1127 | ||
1da177e4 LT |
1128 | #define MAX_NON_LFS ((1UL<<31) - 1) |
1129 | ||
1130 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
1131 | limits, otherwise bad things can happen in VM. */ | |
1132 | #if BITS_PER_LONG==32 | |
2bd2c194 | 1133 | #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
1da177e4 | 1134 | #elif BITS_PER_LONG==64 |
2bd2c194 | 1135 | #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffff) |
1da177e4 LT |
1136 | #endif |
1137 | ||
1138 | #define FL_POSIX 1 | |
1139 | #define FL_FLOCK 2 | |
1140 | #define FL_ACCESS 8 /* not trying to lock, just looking */ | |
f475ae95 | 1141 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 1142 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 1143 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 1144 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
1145 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
1146 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
1da177e4 | 1147 | |
bde74e4b MS |
1148 | /* |
1149 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
1150 | * asynchronous locking. | |
1151 | */ | |
1152 | #define FILE_LOCK_DEFERRED 1 | |
1153 | ||
1da177e4 LT |
1154 | /* |
1155 | * The POSIX file lock owner is determined by | |
1156 | * the "struct files_struct" in the thread group | |
1157 | * (or NULL for no owner - BSD locks). | |
1158 | * | |
1159 | * Lockd stuffs a "host" pointer into this. | |
1160 | */ | |
1161 | typedef struct files_struct *fl_owner_t; | |
1162 | ||
1163 | struct file_lock_operations { | |
1da177e4 LT |
1164 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
1165 | void (*fl_release_private)(struct file_lock *); | |
1166 | }; | |
1167 | ||
1168 | struct lock_manager_operations { | |
8fb47a4f BF |
1169 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
1170 | void (*lm_notify)(struct file_lock *); /* unblock callback */ | |
1171 | int (*lm_grant)(struct file_lock *, struct file_lock *, int); | |
8fb47a4f BF |
1172 | void (*lm_break)(struct file_lock *); |
1173 | int (*lm_change)(struct file_lock **, int); | |
1da177e4 LT |
1174 | }; |
1175 | ||
af558e33 BF |
1176 | struct lock_manager { |
1177 | struct list_head list; | |
1178 | }; | |
1179 | ||
5ccb0066 SK |
1180 | struct net; |
1181 | void locks_start_grace(struct net *, struct lock_manager *); | |
af558e33 | 1182 | void locks_end_grace(struct lock_manager *); |
5ccb0066 | 1183 | int locks_in_grace(struct net *); |
af558e33 | 1184 | |
1da177e4 LT |
1185 | /* that will die - we need it for nfs_lock_info */ |
1186 | #include <linux/nfs_fs_i.h> | |
1187 | ||
1188 | struct file_lock { | |
1189 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
1190 | struct list_head fl_link; /* doubly linked list of all locks */ | |
1191 | struct list_head fl_block; /* circular list of blocked processes */ | |
1192 | fl_owner_t fl_owner; | |
710b7216 | 1193 | unsigned int fl_flags; |
afc1246f | 1194 | unsigned char fl_type; |
1da177e4 | 1195 | unsigned int fl_pid; |
ab1f1611 | 1196 | struct pid *fl_nspid; |
1da177e4 LT |
1197 | wait_queue_head_t fl_wait; |
1198 | struct file *fl_file; | |
1da177e4 LT |
1199 | loff_t fl_start; |
1200 | loff_t fl_end; | |
1201 | ||
1202 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
1203 | /* for lease breaks: */ |
1204 | unsigned long fl_break_time; | |
1205 | unsigned long fl_downgrade_time; | |
1da177e4 | 1206 | |
6aed6285 | 1207 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 1208 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
1209 | union { |
1210 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 1211 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
1212 | struct { |
1213 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
1214 | int state; /* state of grant or error if -ve */ | |
1215 | } afs; | |
1da177e4 LT |
1216 | } fl_u; |
1217 | }; | |
1218 | ||
1219 | /* The following constant reflects the upper bound of the file/locking space */ | |
1220 | #ifndef OFFSET_MAX | |
1221 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1222 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1223 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1224 | #endif | |
1225 | ||
1da177e4 LT |
1226 | #include <linux/fcntl.h> |
1227 | ||
bfcd17a6 TP |
1228 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1229 | ||
bfcd17a6 | 1230 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 | 1231 | extern int fcntl_getlk(struct file *, struct flock __user *); |
c293621b PS |
1232 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
1233 | struct flock __user *); | |
1da177e4 LT |
1234 | |
1235 | #if BITS_PER_LONG == 32 | |
1236 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); | |
c293621b PS |
1237 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1238 | struct flock64 __user *); | |
1da177e4 LT |
1239 | #endif |
1240 | ||
1da177e4 LT |
1241 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1242 | extern int fcntl_getlease(struct file *filp); | |
1243 | ||
1244 | /* fs/locks.c */ | |
05fa3135 | 1245 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1246 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1247 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1248 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
1a747ee0 | 1249 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
1da177e4 LT |
1250 | extern void locks_remove_posix(struct file *, fl_owner_t); |
1251 | extern void locks_remove_flock(struct file *); | |
a9e61e25 | 1252 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1253 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1254 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
1da177e4 | 1255 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
64a318ee | 1256 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
3ee17abd | 1257 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1258 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1259 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
1da177e4 LT |
1260 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
1261 | extern int __break_lease(struct inode *inode, unsigned int flags); | |
1262 | extern void lease_get_mtime(struct inode *, struct timespec *time); | |
0af1a450 | 1263 | extern int generic_setlease(struct file *, long, struct file_lock **); |
a9933cea | 1264 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
1da177e4 LT |
1265 | extern int lease_modify(struct file_lock **, int); |
1266 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); | |
1267 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); | |
66189be7 | 1268 | extern void locks_delete_block(struct file_lock *waiter); |
b89f4321 AB |
1269 | extern void lock_flocks(void); |
1270 | extern void unlock_flocks(void); | |
bfcd17a6 | 1271 | #else /* !CONFIG_FILE_LOCKING */ |
c2aca5e5 SW |
1272 | static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
1273 | { | |
1274 | return -EINVAL; | |
1275 | } | |
1276 | ||
1277 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1278 | unsigned int cmd, struct flock __user *user) | |
1279 | { | |
1280 | return -EACCES; | |
1281 | } | |
1282 | ||
bfcd17a6 | 1283 | #if BITS_PER_LONG == 32 |
c2aca5e5 SW |
1284 | static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
1285 | { | |
1286 | return -EINVAL; | |
1287 | } | |
1288 | ||
1289 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1290 | unsigned int cmd, struct flock64 __user *user) | |
1291 | { | |
1292 | return -EACCES; | |
1293 | } | |
bfcd17a6 | 1294 | #endif |
c2aca5e5 SW |
1295 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1296 | { | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | static inline int fcntl_getlease(struct file *filp) | |
1301 | { | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | static inline void locks_init_lock(struct file_lock *fl) | |
1306 | { | |
1307 | return; | |
1308 | } | |
1309 | ||
1310 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1311 | { | |
1312 | return; | |
1313 | } | |
1314 | ||
1315 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1316 | { | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1321 | { | |
1322 | return; | |
1323 | } | |
1324 | ||
1325 | static inline void locks_remove_flock(struct file *filp) | |
1326 | { | |
1327 | return; | |
1328 | } | |
1329 | ||
1330 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1331 | { | |
1332 | return; | |
1333 | } | |
1334 | ||
1335 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1336 | struct file_lock *conflock) | |
1337 | { | |
1338 | return -ENOLCK; | |
1339 | } | |
1340 | ||
1341 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) | |
1342 | { | |
1343 | return -ENOLCK; | |
1344 | } | |
1345 | ||
1346 | static inline int posix_unblock_lock(struct file *filp, | |
1347 | struct file_lock *waiter) | |
1348 | { | |
1349 | return -ENOENT; | |
1350 | } | |
1351 | ||
1352 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1353 | { | |
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1358 | struct file_lock *fl, struct file_lock *conf) | |
1359 | { | |
1360 | return -ENOLCK; | |
1361 | } | |
1362 | ||
1363 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1364 | { | |
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | static inline int flock_lock_file_wait(struct file *filp, | |
1369 | struct file_lock *request) | |
1370 | { | |
1371 | return -ENOLCK; | |
1372 | } | |
1373 | ||
1374 | static inline int __break_lease(struct inode *inode, unsigned int mode) | |
1375 | { | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) | |
1380 | { | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | static inline int generic_setlease(struct file *filp, long arg, | |
1385 | struct file_lock **flp) | |
1386 | { | |
1387 | return -EINVAL; | |
1388 | } | |
1389 | ||
1390 | static inline int vfs_setlease(struct file *filp, long arg, | |
1391 | struct file_lock **lease) | |
1392 | { | |
1393 | return -EINVAL; | |
1394 | } | |
1395 | ||
1396 | static inline int lease_modify(struct file_lock **before, int arg) | |
1397 | { | |
1398 | return -EINVAL; | |
1399 | } | |
1400 | ||
1401 | static inline int lock_may_read(struct inode *inode, loff_t start, | |
1402 | unsigned long len) | |
1403 | { | |
1404 | return 1; | |
1405 | } | |
1406 | ||
1407 | static inline int lock_may_write(struct inode *inode, loff_t start, | |
1408 | unsigned long len) | |
1409 | { | |
1410 | return 1; | |
1411 | } | |
1412 | ||
66189be7 PS |
1413 | static inline void locks_delete_block(struct file_lock *waiter) |
1414 | { | |
1415 | } | |
1416 | ||
b89f4321 AB |
1417 | static inline void lock_flocks(void) |
1418 | { | |
1419 | } | |
1420 | ||
1421 | static inline void unlock_flocks(void) | |
1422 | { | |
1423 | } | |
1424 | ||
bfcd17a6 TP |
1425 | #endif /* !CONFIG_FILE_LOCKING */ |
1426 | ||
1da177e4 LT |
1427 | |
1428 | struct fasync_struct { | |
989a2979 ED |
1429 | spinlock_t fa_lock; |
1430 | int magic; | |
1431 | int fa_fd; | |
1432 | struct fasync_struct *fa_next; /* singly linked list */ | |
1433 | struct file *fa_file; | |
1434 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1435 | }; |
1436 | ||
1437 | #define FASYNC_MAGIC 0x4601 | |
1438 | ||
1439 | /* SMP safe fasync helpers: */ | |
1440 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1441 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1442 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1443 | extern struct fasync_struct *fasync_alloc(void); | |
1444 | extern void fasync_free(struct fasync_struct *); | |
1445 | ||
1da177e4 LT |
1446 | /* can be called from interrupts */ |
1447 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1448 | |
609d7fa9 | 1449 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1da177e4 LT |
1450 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1451 | extern void f_delown(struct file *filp); | |
609d7fa9 | 1452 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1453 | extern int send_sigurg(struct fown_struct *fown); |
1454 | ||
5accdf82 JK |
1455 | struct mm_struct; |
1456 | ||
1da177e4 LT |
1457 | /* |
1458 | * Umount options | |
1459 | */ | |
1460 | ||
1461 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1462 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1463 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1464 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1465 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 LT |
1466 | |
1467 | extern struct list_head super_blocks; | |
1468 | extern spinlock_t sb_lock; | |
1469 | ||
5accdf82 JK |
1470 | /* Possible states of 'frozen' field */ |
1471 | enum { | |
1472 | SB_UNFROZEN = 0, /* FS is unfrozen */ | |
1473 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ | |
5accdf82 JK |
1474 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1475 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop | |
1476 | * internal threads if needed) */ | |
1477 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ | |
1478 | }; | |
1479 | ||
1480 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) | |
1481 | ||
1482 | struct sb_writers { | |
1483 | /* Counters for counting writers at each level */ | |
1484 | struct percpu_counter counter[SB_FREEZE_LEVELS]; | |
1485 | wait_queue_head_t wait; /* queue for waiting for | |
1486 | writers / faults to finish */ | |
1487 | int frozen; /* Is sb frozen? */ | |
1488 | wait_queue_head_t wait_unfrozen; /* queue for waiting for | |
1489 | sb to be thawed */ | |
1490 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
1491 | struct lockdep_map lock_map[SB_FREEZE_LEVELS]; | |
1492 | #endif | |
1493 | }; | |
1494 | ||
1da177e4 LT |
1495 | struct super_block { |
1496 | struct list_head s_list; /* Keep this first */ | |
1497 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
270ba5f7 RK |
1498 | unsigned char s_blocksize_bits; |
1499 | unsigned long s_blocksize; | |
42cb56ae | 1500 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1501 | struct file_system_type *s_type; |
ee9b6d61 | 1502 | const struct super_operations *s_op; |
61e225dc | 1503 | const struct dquot_operations *dq_op; |
0d54b217 | 1504 | const struct quotactl_ops *s_qcop; |
39655164 | 1505 | const struct export_operations *s_export_op; |
1da177e4 LT |
1506 | unsigned long s_flags; |
1507 | unsigned long s_magic; | |
1508 | struct dentry *s_root; | |
1509 | struct rw_semaphore s_umount; | |
7892f2f4 | 1510 | struct mutex s_lock; |
1da177e4 | 1511 | int s_count; |
1da177e4 | 1512 | atomic_t s_active; |
50462062 | 1513 | #ifdef CONFIG_SECURITY |
1da177e4 | 1514 | void *s_security; |
50462062 | 1515 | #endif |
bb435453 | 1516 | const struct xattr_handler **s_xattr; |
1da177e4 LT |
1517 | |
1518 | struct list_head s_inodes; /* all inodes */ | |
ceb5bdc2 | 1519 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
6416ccb7 NP |
1520 | #ifdef CONFIG_SMP |
1521 | struct list_head __percpu *s_files; | |
1522 | #else | |
1da177e4 | 1523 | struct list_head s_files; |
6416ccb7 | 1524 | #endif |
39f7c4db | 1525 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
b5c84bf6 | 1526 | /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */ |
da3bbdd4 KM |
1527 | struct list_head s_dentry_lru; /* unused dentry lru */ |
1528 | int s_nr_dentry_unused; /* # of dentry on lru */ | |
1da177e4 | 1529 | |
09cc9fc7 DC |
1530 | /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */ |
1531 | spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp; | |
98b745c6 DC |
1532 | struct list_head s_inode_lru; /* unused inode lru */ |
1533 | int s_nr_inodes_unused; /* # of inodes on lru */ | |
1534 | ||
1da177e4 | 1535 | struct block_device *s_bdev; |
32a88aa1 | 1536 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1537 | struct mtd_info *s_mtd; |
a5166169 | 1538 | struct hlist_node s_instances; |
1da177e4 LT |
1539 | struct quota_info s_dquot; /* Diskquota specific options */ |
1540 | ||
5accdf82 | 1541 | struct sb_writers s_writers; |
1da177e4 LT |
1542 | |
1543 | char s_id[32]; /* Informational name */ | |
0bba0169 | 1544 | u8 s_uuid[16]; /* UUID */ |
1da177e4 LT |
1545 | |
1546 | void *s_fs_info; /* Filesystem private info */ | |
8de52778 | 1547 | unsigned int s_max_links; |
30c40d2c | 1548 | fmode_t s_mode; |
1da177e4 | 1549 | |
270ba5f7 RK |
1550 | /* Granularity of c/m/atime in ns. |
1551 | Cannot be worse than a second */ | |
1552 | u32 s_time_gran; | |
1553 | ||
1da177e4 LT |
1554 | /* |
1555 | * The next field is for VFS *only*. No filesystems have any business | |
1556 | * even looking at it. You had been warned. | |
1557 | */ | |
a11f3a05 | 1558 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1559 | |
79c0b2df MS |
1560 | /* |
1561 | * Filesystem subtype. If non-empty the filesystem type field | |
1562 | * in /proc/mounts will be "type.subtype" | |
1563 | */ | |
1564 | char *s_subtype; | |
b3b304a2 MS |
1565 | |
1566 | /* | |
1567 | * Saved mount options for lazy filesystems using | |
1568 | * generic_show_options() | |
1569 | */ | |
4d2deb40 | 1570 | char __rcu *s_options; |
c8aebb0c | 1571 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1572 | |
1573 | /* | |
1574 | * Saved pool identifier for cleancache (-1 means none) | |
1575 | */ | |
1576 | int cleancache_poolid; | |
b0d40c92 DC |
1577 | |
1578 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1579 | |
7ada4db8 MS |
1580 | /* Number of inodes with nlink == 0 but still referenced */ |
1581 | atomic_long_t s_remove_count; | |
1582 | ||
4ed5e82f MS |
1583 | /* Being remounted read-only */ |
1584 | int s_readonly_remount; | |
1da177e4 LT |
1585 | }; |
1586 | ||
b0d40c92 DC |
1587 | /* superblock cache pruning functions */ |
1588 | extern void prune_icache_sb(struct super_block *sb, int nr_to_scan); | |
1589 | extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan); | |
1590 | ||
1da177e4 LT |
1591 | extern struct timespec current_fs_time(struct super_block *sb); |
1592 | ||
1593 | /* | |
1594 | * Snapshotting support. | |
1595 | */ | |
1da177e4 | 1596 | |
5accdf82 JK |
1597 | void __sb_end_write(struct super_block *sb, int level); |
1598 | int __sb_start_write(struct super_block *sb, int level, bool wait); | |
1599 | ||
1600 | /** | |
1601 | * sb_end_write - drop write access to a superblock | |
1602 | * @sb: the super we wrote to | |
1603 | * | |
1604 | * Decrement number of writers to the filesystem. Wake up possible waiters | |
1605 | * wanting to freeze the filesystem. | |
1606 | */ | |
1607 | static inline void sb_end_write(struct super_block *sb) | |
1608 | { | |
1609 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1610 | } | |
1611 | ||
1612 | /** | |
1613 | * sb_end_pagefault - drop write access to a superblock from a page fault | |
1614 | * @sb: the super we wrote to | |
1615 | * | |
1616 | * Decrement number of processes handling write page fault to the filesystem. | |
1617 | * Wake up possible waiters wanting to freeze the filesystem. | |
1618 | */ | |
1619 | static inline void sb_end_pagefault(struct super_block *sb) | |
1620 | { | |
1621 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); | |
1622 | } | |
1623 | ||
1624 | /** | |
1625 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes | |
1626 | * @sb: the super we wrote to | |
1627 | * | |
1628 | * Decrement fs-internal number of writers to the filesystem. Wake up possible | |
1629 | * waiters wanting to freeze the filesystem. | |
1630 | */ | |
1631 | static inline void sb_end_intwrite(struct super_block *sb) | |
1632 | { | |
1633 | __sb_end_write(sb, SB_FREEZE_FS); | |
1634 | } | |
1635 | ||
1636 | /** | |
1637 | * sb_start_write - get write access to a superblock | |
1638 | * @sb: the super we write to | |
1639 | * | |
1640 | * When a process wants to write data or metadata to a file system (i.e. dirty | |
1641 | * a page or an inode), it should embed the operation in a sb_start_write() - | |
1642 | * sb_end_write() pair to get exclusion against file system freezing. This | |
1643 | * function increments number of writers preventing freezing. If the file | |
1644 | * system is already frozen, the function waits until the file system is | |
1645 | * thawed. | |
1646 | * | |
1647 | * Since freeze protection behaves as a lock, users have to preserve | |
1648 | * ordering of freeze protection and other filesystem locks. Generally, | |
1649 | * freeze protection should be the outermost lock. In particular, we have: | |
1650 | * | |
1651 | * sb_start_write | |
1652 | * -> i_mutex (write path, truncate, directory ops, ...) | |
1653 | * -> s_umount (freeze_super, thaw_super) | |
1654 | */ | |
1655 | static inline void sb_start_write(struct super_block *sb) | |
1656 | { | |
1657 | __sb_start_write(sb, SB_FREEZE_WRITE, true); | |
1658 | } | |
1659 | ||
1660 | static inline int sb_start_write_trylock(struct super_block *sb) | |
1661 | { | |
1662 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); | |
1663 | } | |
1664 | ||
1665 | /** | |
1666 | * sb_start_pagefault - get write access to a superblock from a page fault | |
1667 | * @sb: the super we write to | |
1668 | * | |
1669 | * When a process starts handling write page fault, it should embed the | |
1670 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get | |
1671 | * exclusion against file system freezing. This is needed since the page fault | |
1672 | * is going to dirty a page. This function increments number of running page | |
1673 | * faults preventing freezing. If the file system is already frozen, the | |
1674 | * function waits until the file system is thawed. | |
1675 | * | |
1676 | * Since page fault freeze protection behaves as a lock, users have to preserve | |
1677 | * ordering of freeze protection and other filesystem locks. It is advised to | |
1678 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault | |
1679 | * handling code implies lock dependency: | |
1680 | * | |
1681 | * mmap_sem | |
1682 | * -> sb_start_pagefault | |
1683 | */ | |
1684 | static inline void sb_start_pagefault(struct super_block *sb) | |
1685 | { | |
1686 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * sb_start_intwrite - get write access to a superblock for internal fs purposes | |
1691 | * @sb: the super we write to | |
1692 | * | |
1693 | * This is the third level of protection against filesystem freezing. It is | |
1694 | * free for use by a filesystem. The only requirement is that it must rank | |
1695 | * below sb_start_pagefault. | |
1696 | * | |
1697 | * For example filesystem can call sb_start_intwrite() when starting a | |
1698 | * transaction which somewhat eases handling of freezing for internal sources | |
1699 | * of filesystem changes (internal fs threads, discarding preallocation on file | |
1700 | * close, etc.). | |
1701 | */ | |
1702 | static inline void sb_start_intwrite(struct super_block *sb) | |
1703 | { | |
1704 | __sb_start_write(sb, SB_FREEZE_FS, true); | |
1705 | } | |
1da177e4 | 1706 | |
1da177e4 | 1707 | |
2e149670 | 1708 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1709 | |
914e2637 AV |
1710 | /* not quite ready to be deprecated, but... */ |
1711 | extern void lock_super(struct super_block *); | |
1712 | extern void unlock_super(struct super_block *); | |
1da177e4 LT |
1713 | |
1714 | /* | |
1715 | * VFS helper functions.. | |
1716 | */ | |
312b63fb | 1717 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 1718 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1719 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1720 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
1da177e4 LT |
1721 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
1722 | extern int vfs_rmdir(struct inode *, struct dentry *); | |
1723 | extern int vfs_unlink(struct inode *, struct dentry *); | |
1724 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1725 | ||
1726 | /* | |
1727 | * VFS dentry helper functions. | |
1728 | */ | |
1729 | extern void dentry_unhash(struct dentry *dentry); | |
1730 | ||
8c744fb8 CH |
1731 | /* |
1732 | * VFS file helper functions. | |
1733 | */ | |
a1bd120d | 1734 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1735 | umode_t mode); |
c4b929b8 MF |
1736 | /* |
1737 | * VFS FS_IOC_FIEMAP helper definitions. | |
1738 | */ | |
1739 | struct fiemap_extent_info { | |
1740 | unsigned int fi_flags; /* Flags as passed from user */ | |
1741 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1742 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1743 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1744 | fiemap_extent array */ | |
c4b929b8 MF |
1745 | }; |
1746 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1747 | u64 phys, u64 len, u32 flags); | |
1748 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1749 | ||
1da177e4 LT |
1750 | /* |
1751 | * File types | |
1752 | * | |
1753 | * NOTE! These match bits 12..15 of stat.st_mode | |
1754 | * (ie "(i_mode >> 12) & 15"). | |
1755 | */ | |
1756 | #define DT_UNKNOWN 0 | |
1757 | #define DT_FIFO 1 | |
1758 | #define DT_CHR 2 | |
1759 | #define DT_DIR 4 | |
1760 | #define DT_BLK 6 | |
1761 | #define DT_REG 8 | |
1762 | #define DT_LNK 10 | |
1763 | #define DT_SOCK 12 | |
1764 | #define DT_WHT 14 | |
1765 | ||
1da177e4 LT |
1766 | /* |
1767 | * This is the "filldir" function type, used by readdir() to let | |
1768 | * the kernel specify what kind of dirent layout it wants to have. | |
1769 | * This allows the kernel to read directories into kernel space or | |
1770 | * to have different dirent layouts depending on the binary type. | |
1771 | */ | |
afefdbb2 | 1772 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
08f85851 | 1773 | struct block_device_operations; |
1da177e4 | 1774 | |
1da177e4 LT |
1775 | /* These macros are for out of kernel modules to test that |
1776 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1777 | * fields in struct file_operations. */ | |
1778 | #define HAVE_COMPAT_IOCTL 1 | |
1779 | #define HAVE_UNLOCKED_IOCTL 1 | |
1780 | ||
1da177e4 LT |
1781 | struct file_operations { |
1782 | struct module *owner; | |
1783 | loff_t (*llseek) (struct file *, loff_t, int); | |
1784 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1785 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
027445c3 BP |
1786 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1787 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); | |
1da177e4 LT |
1788 | int (*readdir) (struct file *, void *, filldir_t); |
1789 | unsigned int (*poll) (struct file *, struct poll_table_struct *); | |
1da177e4 LT |
1790 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1791 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1792 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1793 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1794 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1795 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1796 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1797 | int (*aio_fsync) (struct kiocb *, int datasync); |
1798 | int (*fasync) (int, struct file *, int); | |
1799 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1800 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1801 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1802 | int (*check_flags)(int); | |
1da177e4 | 1803 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1804 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1805 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
f9ffed26 | 1806 | int (*setlease)(struct file *, long, struct file_lock **); |
2fe17c10 CH |
1807 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1808 | loff_t len); | |
1da177e4 LT |
1809 | }; |
1810 | ||
1811 | struct inode_operations { | |
00cd8dd3 | 1812 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
44a7d7a8 | 1813 | void * (*follow_link) (struct dentry *, struct nameidata *); |
10556cb2 | 1814 | int (*permission) (struct inode *, int); |
4e34e719 | 1815 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1816 | |
1817 | int (*readlink) (struct dentry *, char __user *,int); | |
1818 | void (*put_link) (struct dentry *, struct nameidata *, void *); | |
1819 | ||
ebfc3b49 | 1820 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1da177e4 LT |
1821 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1822 | int (*unlink) (struct inode *,struct dentry *); | |
1823 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1824 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1825 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1826 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 LT |
1827 | int (*rename) (struct inode *, struct dentry *, |
1828 | struct inode *, struct dentry *); | |
1da177e4 | 1829 | void (*truncate) (struct inode *); |
1da177e4 LT |
1830 | int (*setattr) (struct dentry *, struct iattr *); |
1831 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1832 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); | |
1833 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); | |
1834 | ssize_t (*listxattr) (struct dentry *, char *, size_t); | |
1835 | int (*removexattr) (struct dentry *, const char *); | |
c4b929b8 MF |
1836 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1837 | u64 len); | |
c3b2da31 | 1838 | int (*update_time)(struct inode *, struct timespec *, int); |
d9585277 | 1839 | int (*atomic_open)(struct inode *, struct dentry *, |
30d90494 | 1840 | struct file *, unsigned open_flag, |
d9585277 | 1841 | umode_t create_mode, int *opened); |
44a7d7a8 | 1842 | } ____cacheline_aligned; |
1da177e4 LT |
1843 | |
1844 | struct seq_file; | |
1845 | ||
eed4e51f | 1846 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1847 | unsigned long nr_segs, unsigned long fast_segs, |
1848 | struct iovec *fast_pointer, | |
ac34ebb3 | 1849 | struct iovec **ret_pointer); |
eed4e51f | 1850 | |
1da177e4 LT |
1851 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1852 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1853 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
1854 | unsigned long, loff_t *); | |
1855 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, | |
1856 | unsigned long, loff_t *); | |
1857 | ||
1da177e4 LT |
1858 | struct super_operations { |
1859 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1860 | void (*destroy_inode)(struct inode *); | |
1861 | ||
aa385729 | 1862 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1863 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1864 | int (*drop_inode) (struct inode *); |
be7ce416 | 1865 | void (*evict_inode) (struct inode *); |
1da177e4 | 1866 | void (*put_super) (struct super_block *); |
1da177e4 | 1867 | int (*sync_fs)(struct super_block *sb, int wait); |
c4be0c1d TS |
1868 | int (*freeze_fs) (struct super_block *); |
1869 | int (*unfreeze_fs) (struct super_block *); | |
726c3342 | 1870 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1871 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1872 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1873 | |
34c80b1d | 1874 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1875 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1876 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1877 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1878 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1879 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1880 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
0e51a720 | 1881 | #endif |
87d8fe1e | 1882 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
0e1fdafd DC |
1883 | int (*nr_cached_objects)(struct super_block *); |
1884 | void (*free_cached_objects)(struct super_block *, int); | |
1da177e4 LT |
1885 | }; |
1886 | ||
1c0eeaf5 | 1887 | /* |
250df6ed | 1888 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
1889 | * |
1890 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1891 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1892 | * | |
1893 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1894 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1895 | * various stages of removing an inode. | |
1896 | * | |
eaff8079 | 1897 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 1898 | * |
e7ca2d41 JE |
1899 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1900 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
1901 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1902 | * these changes separately from I_DIRTY_SYNC so that we | |
1903 | * don't have to write inode on fdatasync() when only | |
1904 | * mtime has changed in it. | |
1c0eeaf5 | 1905 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
1906 | * I_NEW Serves as both a mutex and completion notification. |
1907 | * New inodes set I_NEW. If two processes both create | |
1908 | * the same inode, one of them will release its inode and | |
1909 | * wait for I_NEW to be released before returning. | |
1910 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1911 | * also cause waiting on I_NEW, without I_NEW actually | |
1912 | * being set. find_inode() uses this to prevent returning | |
1913 | * nearly-dead inodes. | |
1c0eeaf5 JE |
1914 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1915 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1916 | * cleared. | |
1917 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1918 | * pages or buffers attached or the inode itself is still | |
1919 | * dirty. | |
dbd5768f JK |
1920 | * I_CLEAR Added by clear_inode(). In this state the inode is |
1921 | * clean and can be destroyed. Inode keeps I_FREEING. | |
1c0eeaf5 JE |
1922 | * |
1923 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1924 | * prohibited for many purposes. iget() must wait for | |
1925 | * the inode to be completely released, then create it | |
1926 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 1927 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 1928 | * |
169ebd90 JK |
1929 | * I_SYNC Writeback of inode is running. The bit is set during |
1930 | * data writeback, and cleared with a wakeup on the bit | |
1931 | * address once it is done. The bit is also used to pin | |
1932 | * the inode in memory for flusher thread. | |
1c0eeaf5 | 1933 | * |
bd5fe6c5 CH |
1934 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1935 | * | |
1936 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
1937 | * | |
1c0eeaf5 | 1938 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 1939 | */ |
9e38d86f NP |
1940 | #define I_DIRTY_SYNC (1 << 0) |
1941 | #define I_DIRTY_DATASYNC (1 << 1) | |
1942 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
1943 | #define __I_NEW 3 |
1944 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
1945 | #define I_WILL_FREE (1 << 4) |
1946 | #define I_FREEING (1 << 5) | |
1947 | #define I_CLEAR (1 << 6) | |
eaff8079 | 1948 | #define __I_SYNC 7 |
1c0eeaf5 | 1949 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 1950 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 CH |
1951 | #define __I_DIO_WAKEUP 9 |
1952 | #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) | |
1da177e4 LT |
1953 | |
1954 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
1955 | ||
1956 | extern void __mark_inode_dirty(struct inode *, int); | |
1957 | static inline void mark_inode_dirty(struct inode *inode) | |
1958 | { | |
1959 | __mark_inode_dirty(inode, I_DIRTY); | |
1960 | } | |
1961 | ||
1962 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1963 | { | |
1964 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1965 | } | |
1966 | ||
7ada4db8 MS |
1967 | extern void inc_nlink(struct inode *inode); |
1968 | extern void drop_nlink(struct inode *inode); | |
1969 | extern void clear_nlink(struct inode *inode); | |
1970 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
1971 | |
1972 | static inline void inode_inc_link_count(struct inode *inode) | |
1973 | { | |
1974 | inc_nlink(inode); | |
66d21730 AD |
1975 | mark_inode_dirty(inode); |
1976 | } | |
1977 | ||
9a53c3a7 DH |
1978 | static inline void inode_dec_link_count(struct inode *inode) |
1979 | { | |
1980 | drop_nlink(inode); | |
66d21730 AD |
1981 | mark_inode_dirty(inode); |
1982 | } | |
1983 | ||
25ec56b5 JNC |
1984 | /** |
1985 | * inode_inc_iversion - increments i_version | |
1986 | * @inode: inode that need to be updated | |
1987 | * | |
1988 | * Every time the inode is modified, the i_version field will be incremented. | |
1989 | * The filesystem has to be mounted with i_version flag | |
1990 | */ | |
1991 | ||
1992 | static inline void inode_inc_iversion(struct inode *inode) | |
1993 | { | |
1994 | spin_lock(&inode->i_lock); | |
1995 | inode->i_version++; | |
1996 | spin_unlock(&inode->i_lock); | |
1997 | } | |
1998 | ||
c3b2da31 JB |
1999 | enum file_time_flags { |
2000 | S_ATIME = 1, | |
2001 | S_MTIME = 2, | |
2002 | S_CTIME = 4, | |
2003 | S_VERSION = 8, | |
2004 | }; | |
2005 | ||
68ac1234 | 2006 | extern void touch_atime(struct path *); |
1da177e4 LT |
2007 | static inline void file_accessed(struct file *file) |
2008 | { | |
2009 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 2010 | touch_atime(&file->f_path); |
1da177e4 LT |
2011 | } |
2012 | ||
2013 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 2014 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 2015 | |
1da177e4 LT |
2016 | struct file_system_type { |
2017 | const char *name; | |
2018 | int fs_flags; | |
c96e41e9 AV |
2019 | struct dentry *(*mount) (struct file_system_type *, int, |
2020 | const char *, void *); | |
1da177e4 LT |
2021 | void (*kill_sb) (struct super_block *); |
2022 | struct module *owner; | |
2023 | struct file_system_type * next; | |
a5166169 | 2024 | struct hlist_head fs_supers; |
d475fd42 | 2025 | |
cf516249 | 2026 | struct lock_class_key s_lock_key; |
897c6ff9 | 2027 | struct lock_class_key s_umount_key; |
51ee049e | 2028 | struct lock_class_key s_vfs_rename_key; |
5accdf82 | 2029 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
d475fd42 PZ |
2030 | |
2031 | struct lock_class_key i_lock_key; | |
2032 | struct lock_class_key i_mutex_key; | |
14358e6d | 2033 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
2034 | }; |
2035 | ||
ceefda69 AV |
2036 | extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
2037 | void *data, int (*fill_super)(struct super_block *, void *, int)); | |
152a0836 AV |
2038 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2039 | int flags, const char *dev_name, void *data, | |
2040 | int (*fill_super)(struct super_block *, void *, int)); | |
fc14f2fe AV |
2041 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2042 | int flags, void *data, | |
2043 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
2044 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2045 | int flags, void *data, | |
2046 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 2047 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 LT |
2048 | void generic_shutdown_super(struct super_block *sb); |
2049 | void kill_block_super(struct super_block *sb); | |
2050 | void kill_anon_super(struct super_block *sb); | |
2051 | void kill_litter_super(struct super_block *sb); | |
2052 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 2053 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 2054 | int set_anon_super(struct super_block *s, void *data); |
0ee5dc67 AV |
2055 | int get_anon_bdev(dev_t *); |
2056 | void free_anon_bdev(dev_t); | |
1da177e4 LT |
2057 | struct super_block *sget(struct file_system_type *type, |
2058 | int (*test)(struct super_block *,void *), | |
2059 | int (*set)(struct super_block *,void *), | |
9249e17f | 2060 | int flags, void *data); |
51139ada | 2061 | extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
c74a1cbb AV |
2062 | const struct super_operations *ops, |
2063 | const struct dentry_operations *dops, | |
2064 | unsigned long); | |
1da177e4 LT |
2065 | |
2066 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
2067 | #define fops_get(fops) \ | |
2068 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
2069 | #define fops_put(fops) \ | |
2070 | do { if (fops) module_put((fops)->owner); } while(0) | |
2071 | ||
2072 | extern int register_filesystem(struct file_system_type *); | |
2073 | extern int unregister_filesystem(struct file_system_type *); | |
8bf9725c PE |
2074 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
2075 | #define kern_mount(type) kern_mount_data(type, NULL) | |
423e0ab0 | 2076 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
2077 | extern int may_umount_tree(struct vfsmount *); |
2078 | extern int may_umount(struct vfsmount *); | |
2079 | extern long do_mount(char *, char *, char *, unsigned long, void *); | |
589ff870 | 2080 | extern struct vfsmount *collect_mounts(struct path *); |
8aec0809 | 2081 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
2082 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
2083 | struct vfsmount *); | |
ebabe9a9 | 2084 | extern int vfs_statfs(struct path *, struct kstatfs *); |
c8b91acc AV |
2085 | extern int user_statfs(const char __user *, struct kstatfs *); |
2086 | extern int fd_statfs(int, struct kstatfs *); | |
cf31e70d | 2087 | extern int vfs_ustat(dev_t, struct kstatfs *); |
18e9e510 JB |
2088 | extern int freeze_super(struct super_block *super); |
2089 | extern int thaw_super(struct super_block *super); | |
02125a82 | 2090 | extern bool our_mnt(struct vfsmount *mnt); |
1da177e4 | 2091 | |
ce3b0f8d AV |
2092 | extern int current_umask(void); |
2093 | ||
f87fd4c2 | 2094 | /* /sys/fs */ |
00d26666 | 2095 | extern struct kobject *fs_kobj; |
f87fd4c2 | 2096 | |
435f49a5 | 2097 | #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
bfcd17a6 TP |
2098 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
2099 | ||
1da177e4 LT |
2100 | #define FLOCK_VERIFY_READ 1 |
2101 | #define FLOCK_VERIFY_WRITE 2 | |
2102 | ||
bfcd17a6 | 2103 | #ifdef CONFIG_FILE_LOCKING |
1da177e4 LT |
2104 | extern int locks_mandatory_locked(struct inode *); |
2105 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); | |
2106 | ||
2107 | /* | |
2108 | * Candidates for mandatory locking have the setgid bit set | |
2109 | * but no group execute bit - an otherwise meaningless combination. | |
2110 | */ | |
a16877ca PE |
2111 | |
2112 | static inline int __mandatory_lock(struct inode *ino) | |
2113 | { | |
2114 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
2115 | } | |
2116 | ||
2117 | /* | |
2118 | * ... and these candidates should be on MS_MANDLOCK mounted fs, | |
2119 | * otherwise these will be advisory locks | |
2120 | */ | |
2121 | ||
2122 | static inline int mandatory_lock(struct inode *ino) | |
2123 | { | |
2124 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
2125 | } | |
1da177e4 LT |
2126 | |
2127 | static inline int locks_verify_locked(struct inode *inode) | |
2128 | { | |
a16877ca | 2129 | if (mandatory_lock(inode)) |
1da177e4 LT |
2130 | return locks_mandatory_locked(inode); |
2131 | return 0; | |
2132 | } | |
2133 | ||
1da177e4 LT |
2134 | static inline int locks_verify_truncate(struct inode *inode, |
2135 | struct file *filp, | |
2136 | loff_t size) | |
2137 | { | |
a16877ca | 2138 | if (inode->i_flock && mandatory_lock(inode)) |
1da177e4 LT |
2139 | return locks_mandatory_area( |
2140 | FLOCK_VERIFY_WRITE, inode, filp, | |
2141 | size < inode->i_size ? size : inode->i_size, | |
2142 | (size < inode->i_size ? inode->i_size - size | |
2143 | : size - inode->i_size) | |
2144 | ); | |
2145 | return 0; | |
2146 | } | |
2147 | ||
2148 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
2149 | { | |
2150 | if (inode->i_flock) | |
2151 | return __break_lease(inode, mode); | |
2152 | return 0; | |
2153 | } | |
bfcd17a6 | 2154 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
2155 | static inline int locks_mandatory_locked(struct inode *inode) |
2156 | { | |
2157 | return 0; | |
2158 | } | |
2159 | ||
2160 | static inline int locks_mandatory_area(int rw, struct inode *inode, | |
2161 | struct file *filp, loff_t offset, | |
2162 | size_t count) | |
2163 | { | |
2164 | return 0; | |
2165 | } | |
2166 | ||
2167 | static inline int __mandatory_lock(struct inode *inode) | |
2168 | { | |
2169 | return 0; | |
2170 | } | |
2171 | ||
2172 | static inline int mandatory_lock(struct inode *inode) | |
2173 | { | |
2174 | return 0; | |
2175 | } | |
2176 | ||
2177 | static inline int locks_verify_locked(struct inode *inode) | |
2178 | { | |
2179 | return 0; | |
2180 | } | |
2181 | ||
2182 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
2183 | size_t size) | |
2184 | { | |
2185 | return 0; | |
2186 | } | |
2187 | ||
2188 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
2189 | { | |
2190 | return 0; | |
2191 | } | |
2192 | ||
bfcd17a6 | 2193 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2194 | |
2195 | /* fs/open.c */ | |
2196 | ||
4a30131e N |
2197 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2198 | struct file *filp); | |
3e63cbb1 AJ |
2199 | extern int do_fallocate(struct file *file, int mode, loff_t offset, |
2200 | loff_t len); | |
8e8a1407 | 2201 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd AV |
2202 | umode_t mode); |
2203 | extern struct file *filp_open(const char *, int, umode_t); | |
73d049a4 AV |
2204 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
2205 | const char *, int); | |
765927b2 | 2206 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
1da177e4 LT |
2207 | extern int filp_close(struct file *, fl_owner_t id); |
2208 | extern char * getname(const char __user *); | |
47237687 AV |
2209 | enum { |
2210 | FILE_CREATED = 1, | |
2211 | FILE_OPENED = 2 | |
2212 | }; | |
30d90494 AV |
2213 | extern int finish_open(struct file *file, struct dentry *dentry, |
2214 | int (*open)(struct inode *, struct file *), | |
2215 | int *opened); | |
e45198a6 | 2216 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
1da177e4 | 2217 | |
3e63cbb1 AJ |
2218 | /* fs/ioctl.c */ |
2219 | ||
2220 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2221 | ||
1da177e4 LT |
2222 | /* fs/dcache.c */ |
2223 | extern void __init vfs_caches_init_early(void); | |
2224 | extern void __init vfs_caches_init(unsigned long); | |
2225 | ||
b86c089b CL |
2226 | extern struct kmem_cache *names_cachep; |
2227 | ||
3446a8aa VN |
2228 | #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) |
2229 | #define __getname() __getname_gfp(GFP_KERNEL) | |
2230 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) | |
1da177e4 LT |
2231 | #ifndef CONFIG_AUDITSYSCALL |
2232 | #define putname(name) __putname(name) | |
2233 | #else | |
2234 | extern void putname(const char *name); | |
2235 | #endif | |
2236 | ||
9361401e | 2237 | #ifdef CONFIG_BLOCK |
1da177e4 | 2238 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2239 | extern void unregister_blkdev(unsigned int, const char *); |
1da177e4 | 2240 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2241 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 | 2242 | extern void bd_set_size(struct block_device *, loff_t size); |
080399aa | 2243 | extern sector_t blkdev_max_block(struct block_device *bdev); |
1da177e4 LT |
2244 | extern void bd_forget(struct inode *inode); |
2245 | extern void bdput(struct block_device *); | |
585d3bc0 | 2246 | extern void invalidate_bdev(struct block_device *); |
5c0d6b60 | 2247 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
585d3bc0 | 2248 | extern int sync_blockdev(struct block_device *bdev); |
ff01bb48 | 2249 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2250 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2251 | extern void emergency_thaw_all(void); |
585d3bc0 NP |
2252 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2253 | extern int fsync_bdev(struct block_device *); | |
9361401e DH |
2254 | #else |
2255 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2256 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2257 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2258 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2259 | ||
2260 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2261 | { | |
2262 | return NULL; | |
2263 | } | |
2264 | ||
2265 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2266 | { | |
2267 | return 0; | |
2268 | } | |
5c0d6b60 JK |
2269 | |
2270 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) | |
2271 | { | |
2272 | } | |
9361401e | 2273 | #endif |
60b0680f | 2274 | extern int sync_filesystem(struct super_block *); |
9361401e | 2275 | extern const struct file_operations def_blk_fops; |
4b6f5d20 AV |
2276 | extern const struct file_operations def_chr_fops; |
2277 | extern const struct file_operations bad_sock_fops; | |
2278 | extern const struct file_operations def_fifo_fops; | |
9361401e | 2279 | #ifdef CONFIG_BLOCK |
1da177e4 | 2280 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2281 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2282 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2283 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2284 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2285 | void *holder); | |
2286 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2287 | void *holder); | |
e525fd89 | 2288 | extern int blkdev_put(struct block_device *bdev, fmode_t mode); |
641dc636 | 2289 | #ifdef CONFIG_SYSFS |
e09b457b | 2290 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2291 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2292 | struct gendisk *disk); | |
641dc636 | 2293 | #else |
e09b457b TH |
2294 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2295 | struct gendisk *disk) | |
2296 | { | |
2297 | return 0; | |
2298 | } | |
49731baa TH |
2299 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2300 | struct gendisk *disk) | |
2301 | { | |
2302 | } | |
641dc636 | 2303 | #endif |
9361401e | 2304 | #endif |
1da177e4 LT |
2305 | |
2306 | /* fs/char_dev.c */ | |
68eef3b4 | 2307 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
2308 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2309 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2310 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2311 | unsigned int count, const char *name, | |
2312 | const struct file_operations *fops); | |
2313 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2314 | unsigned int count, const char *name); | |
1da177e4 | 2315 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2316 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2317 | |
1905b1bf TH |
2318 | static inline int register_chrdev(unsigned int major, const char *name, |
2319 | const struct file_operations *fops) | |
2320 | { | |
2321 | return __register_chrdev(major, 0, 256, name, fops); | |
2322 | } | |
2323 | ||
2324 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2325 | { | |
2326 | __unregister_chrdev(major, 0, 256, name); | |
2327 | } | |
2328 | ||
1da177e4 LT |
2329 | /* fs/block_dev.c */ |
2330 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2331 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2332 | |
2333 | #ifdef CONFIG_BLOCK | |
2334 | #define BLKDEV_MAJOR_HASH_SIZE 255 | |
1da177e4 LT |
2335 | extern const char *__bdevname(dev_t, char *buffer); |
2336 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2337 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2338 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2339 | |
9361401e DH |
2340 | #else |
2341 | #define BLKDEV_MAJOR_HASH_SIZE 0 | |
2342 | #endif | |
1da177e4 LT |
2343 | |
2344 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2345 | ||
2346 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2347 | extern void make_bad_inode(struct inode *); | |
2348 | extern int is_bad_inode(struct inode *); | |
2349 | ||
d2d9648e DV |
2350 | extern const struct file_operations read_pipefifo_fops; |
2351 | extern const struct file_operations write_pipefifo_fops; | |
2352 | extern const struct file_operations rdwr_pipefifo_fops; | |
1da177e4 | 2353 | |
9361401e | 2354 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
2355 | /* |
2356 | * return READ, READA, or WRITE | |
2357 | */ | |
2358 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) | |
2359 | ||
2360 | /* | |
2361 | * return data direction, READ or WRITE | |
2362 | */ | |
2363 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) | |
2364 | ||
c3279d14 AP |
2365 | extern void check_disk_size_change(struct gendisk *disk, |
2366 | struct block_device *bdev); | |
0c002c2f | 2367 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2368 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2369 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2370 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2371 | #endif |
1da177e4 LT |
2372 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2373 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2374 | |
1da177e4 LT |
2375 | static inline void invalidate_remote_inode(struct inode *inode) |
2376 | { | |
2377 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2378 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2379 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2380 | } |
2381 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2382 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2383 | pgoff_t start, pgoff_t end); | |
2384 | extern int write_inode_now(struct inode *, int); | |
2385 | extern int filemap_fdatawrite(struct address_space *); | |
2386 | extern int filemap_flush(struct address_space *); | |
2387 | extern int filemap_fdatawait(struct address_space *); | |
d3bccb6f JK |
2388 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2389 | loff_t lend); | |
1da177e4 LT |
2390 | extern int filemap_write_and_wait(struct address_space *mapping); |
2391 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2392 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2393 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2394 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2395 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2396 | loff_t start, loff_t end); | |
ebcf28e1 | 2397 | |
8018ab05 CH |
2398 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2399 | int datasync); | |
2400 | extern int vfs_fsync(struct file *file, int datasync); | |
148f948b | 2401 | extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); |
1da177e4 LT |
2402 | extern void emergency_sync(void); |
2403 | extern void emergency_remount(void); | |
9361401e | 2404 | #ifdef CONFIG_BLOCK |
1da177e4 | 2405 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2406 | #endif |
1da177e4 | 2407 | extern int notify_change(struct dentry *, struct iattr *); |
f419a2e3 | 2408 | extern int inode_permission(struct inode *, int); |
2830ba7f | 2409 | extern int generic_permission(struct inode *, int); |
1da177e4 | 2410 | |
f696a365 MS |
2411 | static inline bool execute_ok(struct inode *inode) |
2412 | { | |
2413 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2414 | } | |
2415 | ||
07b8ce1e AV |
2416 | /* |
2417 | * get_write_access() gets write permission for a file. | |
2418 | * put_write_access() releases this write permission. | |
2419 | * This is used for regular files. | |
2420 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2421 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2422 | * can have the following values: | |
2423 | * 0: no writers, no VM_DENYWRITE mappings | |
2424 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2425 | * > 0: (i_writecount) users are writing to the file. | |
2426 | * | |
2427 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2428 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2429 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2430 | * to do the change if sign is wrong. | |
2431 | */ | |
2432 | static inline int get_write_access(struct inode *inode) | |
2433 | { | |
2434 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2435 | } | |
2436 | static inline int deny_write_access(struct file *file) | |
2437 | { | |
2438 | struct inode *inode = file->f_path.dentry->d_inode; | |
2439 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2440 | } | |
1da177e4 LT |
2441 | static inline void put_write_access(struct inode * inode) |
2442 | { | |
2443 | atomic_dec(&inode->i_writecount); | |
2444 | } | |
2445 | static inline void allow_write_access(struct file *file) | |
2446 | { | |
2447 | if (file) | |
0f7fc9e4 | 2448 | atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
1da177e4 | 2449 | } |
a5c96ebf MZ |
2450 | #ifdef CONFIG_IMA |
2451 | static inline void i_readcount_dec(struct inode *inode) | |
2452 | { | |
2453 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2454 | atomic_dec(&inode->i_readcount); | |
2455 | } | |
2456 | static inline void i_readcount_inc(struct inode *inode) | |
2457 | { | |
2458 | atomic_inc(&inode->i_readcount); | |
2459 | } | |
2460 | #else | |
2461 | static inline void i_readcount_dec(struct inode *inode) | |
2462 | { | |
2463 | return; | |
2464 | } | |
2465 | static inline void i_readcount_inc(struct inode *inode) | |
2466 | { | |
2467 | return; | |
2468 | } | |
2469 | #endif | |
ed8cae8b | 2470 | extern int do_pipe_flags(int *, int); |
1da177e4 | 2471 | |
6777d773 | 2472 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
1da177e4 LT |
2473 | extern struct file * open_exec(const char *); |
2474 | ||
2475 | /* fs/dcache.c -- generic fs support functions */ | |
2476 | extern int is_subdir(struct dentry *, struct dentry *); | |
2096f759 | 2477 | extern int path_is_under(struct path *, struct path *); |
1da177e4 LT |
2478 | extern ino_t find_inode_number(struct dentry *, struct qstr *); |
2479 | ||
2480 | #include <linux/err.h> | |
2481 | ||
2482 | /* needed for stackable file system support */ | |
2483 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); | |
2484 | ||
2485 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); | |
2486 | ||
54e34621 | 2487 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2488 | extern void inode_init_once(struct inode *); |
2aa15890 | 2489 | extern void address_space_init_once(struct address_space *mapping); |
7de9c6ee | 2490 | extern void ihold(struct inode * inode); |
1da177e4 LT |
2491 | extern void iput(struct inode *); |
2492 | extern struct inode * igrab(struct inode *); | |
2493 | extern ino_t iunique(struct super_block *, ino_t); | |
2494 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2495 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2496 | static inline int generic_drop_inode(struct inode *inode) |
2497 | { | |
2498 | return !inode->i_nlink || inode_unhashed(inode); | |
2499 | } | |
1da177e4 | 2500 | |
88bd5121 AA |
2501 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2502 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2503 | void *data); | |
1da177e4 LT |
2504 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2505 | int (*test)(struct inode *, void *), void *data); | |
2506 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2507 | ||
2508 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
2509 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
261bca86 AV |
2510 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2511 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
2512 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2513 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
2514 | #else | |
2515 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
2516 | #endif | |
1da177e4 | 2517 | extern void unlock_new_inode(struct inode *); |
85fe4025 | 2518 | extern unsigned int get_next_ino(void); |
1da177e4 | 2519 | |
1da177e4 | 2520 | extern void __iget(struct inode * inode); |
b46980fe | 2521 | extern void iget_failed(struct inode *); |
dbd5768f | 2522 | extern void clear_inode(struct inode *); |
2e00c97e | 2523 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
2524 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2525 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 2526 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 2527 | extern int should_remove_suid(struct dentry *); |
2f1936b8 | 2528 | extern int file_remove_suid(struct file *); |
1da177e4 LT |
2529 | |
2530 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
2531 | static inline void insert_inode_hash(struct inode *inode) |
2532 | { | |
1da177e4 LT |
2533 | __insert_inode_hash(inode, inode->i_ino); |
2534 | } | |
f2ee7abf ED |
2535 | |
2536 | extern void __remove_inode_hash(struct inode *); | |
2537 | static inline void remove_inode_hash(struct inode *inode) | |
2538 | { | |
2539 | if (!inode_unhashed(inode)) | |
2540 | __remove_inode_hash(inode); | |
2541 | } | |
2542 | ||
646ec461 | 2543 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 2544 | |
9361401e | 2545 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
2546 | extern void submit_bio(int, struct bio *); |
2547 | extern int bdev_read_only(struct block_device *); | |
9361401e | 2548 | #endif |
1da177e4 LT |
2549 | extern int set_blocksize(struct block_device *, int); |
2550 | extern int sb_set_blocksize(struct super_block *, int); | |
2551 | extern int sb_min_blocksize(struct super_block *, int); | |
2552 | ||
2553 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
2554 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
2555 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1da177e4 | 2556 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
027445c3 | 2557 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
e4dd9de3 JK |
2558 | extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, |
2559 | loff_t *); | |
027445c3 | 2560 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1da177e4 LT |
2561 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
2562 | unsigned long *, loff_t, loff_t *, size_t, size_t); | |
2563 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, | |
2564 | unsigned long, loff_t, loff_t *, size_t, ssize_t); | |
2565 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); | |
2566 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); | |
0ceb3314 DM |
2567 | extern int generic_segment_checks(const struct iovec *iov, |
2568 | unsigned long *nr_segs, size_t *count, int access_flags); | |
88e6faef | 2569 | |
eef99380 CH |
2570 | /* fs/block_dev.c */ |
2571 | extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
2572 | unsigned long nr_segs, loff_t pos); | |
02c24a82 JB |
2573 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2574 | int datasync); | |
ff01bb48 | 2575 | extern void block_sync_page(struct page *page); |
eef99380 | 2576 | |
88e6faef | 2577 | /* fs/splice.c */ |
cbb7e577 | 2578 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 2579 | struct pipe_inode_info *, size_t, unsigned int); |
6818173b MS |
2580 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
2581 | struct pipe_inode_info *, size_t, unsigned int); | |
88e6faef | 2582 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 2583 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 2584 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 JA |
2585 | struct file *out, loff_t *, size_t len, unsigned int flags); |
2586 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, | |
88e6faef AM |
2587 | size_t len, unsigned int flags); |
2588 | ||
1da177e4 LT |
2589 | extern void |
2590 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
ae6afc3f | 2591 | extern loff_t noop_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 LT |
2592 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
2593 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); | |
5760495a | 2594 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
e8b96eb5 | 2595 | int origin, loff_t maxsize, loff_t eof); |
1da177e4 LT |
2596 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2597 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
2598 | ||
ceffc078 | 2599 | #ifdef CONFIG_FS_XIP |
eb6fe0c3 CO |
2600 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
2601 | loff_t *ppos); | |
ceffc078 | 2602 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
eb6fe0c3 CO |
2603 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
2604 | size_t len, loff_t *ppos); | |
ceffc078 | 2605 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
6d79125b CO |
2606 | #else |
2607 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) | |
2608 | { | |
2609 | return 0; | |
2610 | } | |
ceffc078 CO |
2611 | #endif |
2612 | ||
9361401e | 2613 | #ifdef CONFIG_BLOCK |
facd07b0 JB |
2614 | typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
2615 | loff_t file_offset); | |
1da177e4 LT |
2616 | |
2617 | enum { | |
1e431f5c CH |
2618 | /* need locking between buffered and direct access */ |
2619 | DIO_LOCKING = 0x01, | |
2620 | ||
2621 | /* filesystem does not support filling holes */ | |
2622 | DIO_SKIP_HOLES = 0x02, | |
1da177e4 LT |
2623 | }; |
2624 | ||
eafdc7d1 CH |
2625 | void dio_end_io(struct bio *bio, int error); |
2626 | ||
2627 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, | |
2628 | struct block_device *bdev, const struct iovec *iov, loff_t offset, | |
2629 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, | |
2630 | dio_submit_t submit_io, int flags); | |
7bb46a67 | 2631 | |
1da177e4 | 2632 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
aacfc19c CH |
2633 | struct inode *inode, const struct iovec *iov, loff_t offset, |
2634 | unsigned long nr_segs, get_block_t get_block) | |
1da177e4 | 2635 | { |
aacfc19c CH |
2636 | return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
2637 | offset, nr_segs, get_block, NULL, NULL, | |
1e431f5c | 2638 | DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 2639 | } |
9361401e | 2640 | #endif |
1da177e4 | 2641 | |
1d59d61f TM |
2642 | void inode_dio_wait(struct inode *inode); |
2643 | void inode_dio_done(struct inode *inode); | |
2644 | ||
4b6f5d20 | 2645 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
2646 | |
2647 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
2648 | ||
2649 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); | |
2650 | extern int vfs_follow_link(struct nameidata *, const char *); | |
2651 | extern int page_readlink(struct dentry *, char __user *, int); | |
cc314eef LT |
2652 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
2653 | extern void page_put_link(struct dentry *, struct nameidata *, void *); | |
0adb25d2 | 2654 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 2655 | int nofs); |
1da177e4 | 2656 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 2657 | extern const struct inode_operations page_symlink_inode_operations; |
1da177e4 LT |
2658 | extern int generic_readlink(struct dentry *, char __user *, int); |
2659 | extern void generic_fillattr(struct inode *, struct kstat *); | |
2660 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
b462707e | 2661 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 LT |
2662 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
2663 | void inode_sub_bytes(struct inode *inode, loff_t bytes); | |
2664 | loff_t inode_get_bytes(struct inode *inode); | |
2665 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
2666 | ||
2667 | extern int vfs_readdir(struct file *, filldir_t, void *); | |
2668 | ||
c7887325 DH |
2669 | extern int vfs_stat(const char __user *, struct kstat *); |
2670 | extern int vfs_lstat(const char __user *, struct kstat *); | |
1da177e4 | 2671 | extern int vfs_fstat(unsigned int, struct kstat *); |
c7887325 | 2672 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
1da177e4 | 2673 | |
deb21db7 EZ |
2674 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
2675 | unsigned long arg); | |
e9079cce | 2676 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
2677 | struct fiemap_extent_info *fieinfo, |
2678 | loff_t start, loff_t len, | |
2679 | get_block_t *get_block); | |
68c9d702 JB |
2680 | extern int generic_block_fiemap(struct inode *inode, |
2681 | struct fiemap_extent_info *fieinfo, u64 start, | |
2682 | u64 len, get_block_t *get_block); | |
1da177e4 | 2683 | |
c18479fe MS |
2684 | extern void get_filesystem(struct file_system_type *fs); |
2685 | extern void put_filesystem(struct file_system_type *fs); | |
1da177e4 LT |
2686 | extern struct file_system_type *get_fs_type(const char *name); |
2687 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 2688 | extern struct super_block *get_super_thawed(struct block_device *); |
4504230a | 2689 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 2690 | extern void drop_super(struct super_block *sb); |
01a05b33 | 2691 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
2692 | extern void iterate_supers_type(struct file_system_type *, |
2693 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
2694 | |
2695 | extern int dcache_dir_open(struct inode *, struct file *); | |
2696 | extern int dcache_dir_close(struct inode *, struct file *); | |
2697 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
2698 | extern int dcache_readdir(struct file *, void *, filldir_t); | |
7bb46a67 | 2699 | extern int simple_setattr(struct dentry *, struct iattr *); |
1da177e4 | 2700 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
726c3342 | 2701 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
20955e89 | 2702 | extern int simple_open(struct inode *inode, struct file *file); |
1da177e4 LT |
2703 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
2704 | extern int simple_unlink(struct inode *, struct dentry *); | |
2705 | extern int simple_rmdir(struct inode *, struct dentry *); | |
2706 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
02c24a82 | 2707 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
2708 | extern int simple_empty(struct dentry *); |
2709 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
2710 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
2711 | loff_t pos, unsigned len, unsigned flags, | |
2712 | struct page **pagep, void **fsdata); | |
2713 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
2714 | loff_t pos, unsigned len, unsigned copied, | |
2715 | struct page *page, void *fsdata); | |
1da177e4 | 2716 | |
00cd8dd3 | 2717 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
1da177e4 | 2718 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
4b6f5d20 | 2719 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 2720 | extern const struct inode_operations simple_dir_inode_operations; |
4b6f5d20 | 2721 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 2722 | struct dentry *d_alloc_name(struct dentry *, const char *); |
7d683a09 | 2723 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
1f5ce9e9 | 2724 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
2725 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
2726 | ||
93b07113 AM |
2727 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
2728 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
2729 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
2730 | const void __user *from, size_t count); | |
1da177e4 | 2731 | |
02c24a82 | 2732 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 2733 | |
30ca22c7 PL |
2734 | extern int generic_check_addressable(unsigned, u64); |
2735 | ||
e965f963 | 2736 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 2737 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
2738 | struct page *, struct page *, |
2739 | enum migrate_mode); | |
e965f963 CL |
2740 | #else |
2741 | #define buffer_migrate_page NULL | |
2742 | #endif | |
2743 | ||
25d9e2d1 | 2744 | extern int inode_change_ok(const struct inode *, struct iattr *); |
2745 | extern int inode_newsize_ok(const struct inode *, loff_t offset); | |
6a1a90ad | 2746 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 2747 | |
c3b2da31 | 2748 | extern int file_update_time(struct file *file); |
1da177e4 | 2749 | |
34c80b1d | 2750 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
b3b304a2 | 2751 | extern void save_mount_options(struct super_block *sb, char *options); |
2a32cebd | 2752 | extern void replace_mount_options(struct super_block *sb, char *options); |
b3b304a2 | 2753 | |
1da177e4 LT |
2754 | static inline ino_t parent_ino(struct dentry *dentry) |
2755 | { | |
2756 | ino_t res; | |
2757 | ||
b5c84bf6 NP |
2758 | /* |
2759 | * Don't strictly need d_lock here? If the parent ino could change | |
2760 | * then surely we'd have a deeper race in the caller? | |
2761 | */ | |
1da177e4 LT |
2762 | spin_lock(&dentry->d_lock); |
2763 | res = dentry->d_parent->d_inode->i_ino; | |
2764 | spin_unlock(&dentry->d_lock); | |
2765 | return res; | |
2766 | } | |
2767 | ||
1da177e4 LT |
2768 | /* Transaction based IO helpers */ |
2769 | ||
2770 | /* | |
2771 | * An argresp is stored in an allocated page and holds the | |
2772 | * size of the argument or response, along with its content | |
2773 | */ | |
2774 | struct simple_transaction_argresp { | |
2775 | ssize_t size; | |
2776 | char data[0]; | |
2777 | }; | |
2778 | ||
2779 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
2780 | ||
2781 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
2782 | size_t size); | |
2783 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
2784 | size_t size, loff_t *pos); | |
2785 | int simple_transaction_release(struct inode *inode, struct file *file); | |
2786 | ||
76791ab2 | 2787 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 2788 | |
acaefc25 AB |
2789 | /* |
2790 | * simple attribute files | |
2791 | * | |
2792 | * These attributes behave similar to those in sysfs: | |
2793 | * | |
2794 | * Writing to an attribute immediately sets a value, an open file can be | |
2795 | * written to multiple times. | |
2796 | * | |
2797 | * Reading from an attribute creates a buffer from the value that might get | |
2798 | * read with multiple read calls. When the attribute has been read | |
2799 | * completely, no further read calls are possible until the file is opened | |
2800 | * again. | |
2801 | * | |
2802 | * All attributes contain a text representation of a numeric value | |
2803 | * that are accessed with the get() and set() functions. | |
2804 | */ | |
2805 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
2806 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
2807 | { \ | |
2808 | __simple_attr_check_format(__fmt, 0ull); \ | |
2809 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
2810 | } \ | |
828c0950 | 2811 | static const struct file_operations __fops = { \ |
acaefc25 AB |
2812 | .owner = THIS_MODULE, \ |
2813 | .open = __fops ## _open, \ | |
74bedc4d | 2814 | .release = simple_attr_release, \ |
acaefc25 AB |
2815 | .read = simple_attr_read, \ |
2816 | .write = simple_attr_write, \ | |
1ec5584e | 2817 | .llseek = generic_file_llseek, \ |
acaefc25 AB |
2818 | }; |
2819 | ||
b9075fa9 JP |
2820 | static inline __printf(1, 2) |
2821 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
2822 | { |
2823 | /* don't do anything, just let the compiler check the arguments; */ | |
2824 | } | |
2825 | ||
2826 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 2827 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 2828 | const char *fmt); |
74bedc4d | 2829 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
2830 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
2831 | size_t len, loff_t *ppos); | |
2832 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
2833 | size_t len, loff_t *ppos); | |
2834 | ||
4be28540 | 2835 | struct ctl_table; |
8d65af78 | 2836 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 2837 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
2838 | int proc_nr_dentry(struct ctl_table *table, int write, |
2839 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
2840 | int proc_nr_inodes(struct ctl_table *table, int write, |
2841 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 2842 | int __init get_filesystem_list(char *buf); |
62239ac2 | 2843 | |
3cd90ea4 | 2844 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
2845 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
2846 | ||
6d125529 | 2847 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 2848 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 2849 | (flag & __FMODE_NONOTIFY))) |
5300990c | 2850 | |
8d334acd | 2851 | static inline int is_sxid(umode_t mode) |
69b45732 AK |
2852 | { |
2853 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
2854 | } | |
2855 | ||
2856 | static inline void inode_has_no_xattr(struct inode *inode) | |
2857 | { | |
9e1f1de0 | 2858 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
69b45732 AK |
2859 | inode->i_flags |= S_NOSEC; |
2860 | } | |
2861 | ||
1da177e4 LT |
2862 | #endif /* __KERNEL__ */ |
2863 | #endif /* _LINUX_FS_H */ |