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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> | |
11 | ||
12 | /* | |
13 | * It's silly to have NR_OPEN bigger than NR_FILE, but you can change | |
14 | * the file limit at runtime and only root can increase the per-process | |
15 | * nr_file rlimit, so it's safe to set up a ridiculously high absolute | |
16 | * upper limit on files-per-process. | |
17 | * | |
18 | * Some programs (notably those using select()) may have to be | |
19 | * recompiled to take full advantage of the new limits.. | |
20 | */ | |
21 | ||
22 | /* Fixed constants first: */ | |
23 | #undef NR_OPEN | |
24 | #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */ | |
25 | #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ | |
26 | ||
27 | #define BLOCK_SIZE_BITS 10 | |
28 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) | |
29 | ||
01bf466e DH |
30 | #define SEEK_SET 0 /* seek relative to beginning of file */ |
31 | #define SEEK_CUR 1 /* seek relative to current file position */ | |
32 | #define SEEK_END 2 /* seek relative to end of file */ | |
1ae7075b | 33 | #define SEEK_MAX SEEK_END |
01bf466e | 34 | |
1da177e4 LT |
35 | /* And dynamically-tunable limits and defaults: */ |
36 | struct files_stat_struct { | |
37 | int nr_files; /* read only */ | |
38 | int nr_free_files; /* read only */ | |
39 | int max_files; /* tunable */ | |
40 | }; | |
41 | extern struct files_stat_struct files_stat; | |
529bf6be | 42 | extern int get_max_files(void); |
1da177e4 LT |
43 | |
44 | struct inodes_stat_t { | |
45 | int nr_inodes; | |
46 | int nr_unused; | |
9e7bf24b | 47 | int dummy[5]; /* padding for sysctl ABI compatibility */ |
1da177e4 LT |
48 | }; |
49 | extern struct inodes_stat_t inodes_stat; | |
50 | ||
51 | extern int leases_enable, lease_break_time; | |
52 | ||
53 | #ifdef CONFIG_DNOTIFY | |
54 | extern int dir_notify_enable; | |
55 | #endif | |
56 | ||
57 | #define NR_FILE 8192 /* this can well be larger on a larger system */ | |
58 | ||
59 | #define MAY_EXEC 1 | |
60 | #define MAY_WRITE 2 | |
61 | #define MAY_READ 4 | |
62 | #define MAY_APPEND 8 | |
63 | ||
64 | #define FMODE_READ 1 | |
65 | #define FMODE_WRITE 2 | |
66 | ||
67 | /* Internal kernel extensions */ | |
68 | #define FMODE_LSEEK 4 | |
69 | #define FMODE_PREAD 8 | |
70 | #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ | |
71 | ||
b500531e OD |
72 | /* File is being opened for execution. Primary users of this flag are |
73 | distributed filesystems that can use it to achieve correct ETXTBUSY | |
74 | behavior for cross-node execution/opening_for_writing of files */ | |
75 | #define FMODE_EXEC 16 | |
76 | ||
1da177e4 LT |
77 | #define RW_MASK 1 |
78 | #define RWA_MASK 2 | |
79 | #define READ 0 | |
80 | #define WRITE 1 | |
81 | #define READA 2 /* read-ahead - don't block if no resources */ | |
a7662236 | 82 | #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
1da177e4 | 83 | #define READ_SYNC (READ | (1 << BIO_RW_SYNC)) |
5404bc7a | 84 | #define READ_META (READ | (1 << BIO_RW_META)) |
1da177e4 LT |
85 | #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) |
86 | #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) | |
87 | ||
88 | #define SEL_IN 1 | |
89 | #define SEL_OUT 2 | |
90 | #define SEL_EX 4 | |
91 | ||
92 | /* public flags for file_system_type */ | |
93 | #define FS_REQUIRES_DEV 1 | |
94 | #define FS_BINARY_MOUNTDATA 2 | |
79c0b2df | 95 | #define FS_HAS_SUBTYPE 4 |
1da177e4 | 96 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
349457cc MF |
97 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
98 | * during rename() internally. | |
99 | */ | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * These are the fs-independent mount-flags: up to 32 flags are supported | |
103 | */ | |
104 | #define MS_RDONLY 1 /* Mount read-only */ | |
105 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |
106 | #define MS_NODEV 4 /* Disallow access to device special files */ | |
107 | #define MS_NOEXEC 8 /* Disallow program execution */ | |
108 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ | |
109 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ | |
110 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
111 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ | |
112 | #define MS_NOATIME 1024 /* Do not update access times. */ | |
113 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ | |
114 | #define MS_BIND 4096 | |
115 | #define MS_MOVE 8192 | |
116 | #define MS_REC 16384 | |
9b04c997 TT |
117 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
118 | MS_VERBOSE is deprecated. */ | |
119 | #define MS_SILENT 32768 | |
bf066c7d | 120 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
9676f0c6 | 121 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
07b20889 | 122 | #define MS_PRIVATE (1<<18) /* change to private */ |
a58b0eb8 | 123 | #define MS_SLAVE (1<<19) /* change to slave */ |
03e06e68 | 124 | #define MS_SHARED (1<<20) /* change to shared */ |
47ae32d6 | 125 | #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ |
1da177e4 LT |
126 | #define MS_ACTIVE (1<<30) |
127 | #define MS_NOUSER (1<<31) | |
128 | ||
129 | /* | |
130 | * Superblock flags that can be altered by MS_REMOUNT | |
131 | */ | |
fc33a7bb | 132 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK) |
1da177e4 LT |
133 | |
134 | /* | |
135 | * Old magic mount flag and mask | |
136 | */ | |
137 | #define MS_MGC_VAL 0xC0ED0000 | |
138 | #define MS_MGC_MSK 0xffff0000 | |
139 | ||
140 | /* Inode flags - they have nothing to superblock flags now */ | |
141 | ||
142 | #define S_SYNC 1 /* Writes are synced at once */ | |
143 | #define S_NOATIME 2 /* Do not update access times */ | |
144 | #define S_APPEND 4 /* Append-only file */ | |
145 | #define S_IMMUTABLE 8 /* Immutable file */ | |
146 | #define S_DEAD 16 /* removed, but still open directory */ | |
147 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
148 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
149 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
150 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
151 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
152 | ||
153 | /* | |
154 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
155 | * flags just means all the inodes inherit those flags by default. It might be | |
156 | * possible to override it selectively if you really wanted to with some | |
157 | * ioctl() that is not currently implemented. | |
158 | * | |
159 | * Exception: MS_RDONLY is always applied to the entire file system. | |
160 | * | |
161 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
162 | * with files in use. This means that all of the inodes will not have their | |
163 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
164 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
165 | */ | |
166 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) | |
167 | ||
168 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
169 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
170 | ((inode)->i_flags & S_SYNC)) | |
171 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
172 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
173 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
37756ced | 174 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
1da177e4 LT |
175 | |
176 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
177 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
178 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
179 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
180 | ||
181 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
182 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
183 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
184 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
185 | ||
186 | /* the read-only stuff doesn't really belong here, but any other place is | |
187 | probably as bad and I don't want to create yet another include file. */ | |
188 | ||
189 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ | |
190 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ | |
191 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ | |
192 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ | |
193 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ | |
194 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ | |
195 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ | |
196 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ | |
197 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ | |
198 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ | |
199 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ | |
200 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ | |
201 | #if 0 | |
202 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ | |
203 | ||
204 | /* Some people are morons. Do not use sizeof! */ | |
205 | ||
206 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ | |
207 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ | |
208 | /* This was here just to show that the number is taken - | |
209 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ | |
210 | #endif | |
211 | /* A jump here: 108-111 have been used for various private purposes. */ | |
212 | #define BLKBSZGET _IOR(0x12,112,size_t) | |
213 | #define BLKBSZSET _IOW(0x12,113,size_t) | |
214 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
2056a782 JA |
215 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
216 | #define BLKTRACESTART _IO(0x12,116) | |
217 | #define BLKTRACESTOP _IO(0x12,117) | |
218 | #define BLKTRACETEARDOWN _IO(0x12,118) | |
1da177e4 LT |
219 | |
220 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ | |
221 | #define FIBMAP _IO(0x00,1) /* bmap access */ | |
222 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ | |
223 | ||
36695673 DH |
224 | #define FS_IOC_GETFLAGS _IOR('f', 1, long) |
225 | #define FS_IOC_SETFLAGS _IOW('f', 2, long) | |
226 | #define FS_IOC_GETVERSION _IOR('v', 1, long) | |
227 | #define FS_IOC_SETVERSION _IOW('v', 2, long) | |
228 | #define FS_IOC32_GETFLAGS _IOR('f', 1, int) | |
229 | #define FS_IOC32_SETFLAGS _IOW('f', 2, int) | |
230 | #define FS_IOC32_GETVERSION _IOR('v', 1, int) | |
231 | #define FS_IOC32_SETVERSION _IOW('v', 2, int) | |
232 | ||
233 | /* | |
234 | * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) | |
235 | */ | |
236 | #define FS_SECRM_FL 0x00000001 /* Secure deletion */ | |
237 | #define FS_UNRM_FL 0x00000002 /* Undelete */ | |
238 | #define FS_COMPR_FL 0x00000004 /* Compress file */ | |
239 | #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ | |
240 | #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
241 | #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ | |
242 | #define FS_NODUMP_FL 0x00000040 /* do not dump file */ | |
243 | #define FS_NOATIME_FL 0x00000080 /* do not update atime */ | |
244 | /* Reserved for compression usage... */ | |
245 | #define FS_DIRTY_FL 0x00000100 | |
246 | #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
247 | #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ | |
248 | #define FS_ECOMPR_FL 0x00000800 /* Compression error */ | |
249 | /* End compression flags --- maybe not all used */ | |
250 | #define FS_BTREE_FL 0x00001000 /* btree format dir */ | |
251 | #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ | |
252 | #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ | |
253 | #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ | |
254 | #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
255 | #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
256 | #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
128e5eba SW |
257 | #define FS_EXTENT_FL 0x00080000 /* Extents */ |
258 | #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ | |
36695673 DH |
259 | #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
260 | ||
261 | #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ | |
262 | #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ | |
263 | ||
264 | ||
e46e4903 AM |
265 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
266 | #define SYNC_FILE_RANGE_WRITE 2 | |
267 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 | |
268 | ||
1da177e4 LT |
269 | #ifdef __KERNEL__ |
270 | ||
271 | #include <linux/linkage.h> | |
272 | #include <linux/wait.h> | |
273 | #include <linux/types.h> | |
274 | #include <linux/kdev_t.h> | |
275 | #include <linux/dcache.h> | |
0f7fc9e4 | 276 | #include <linux/namei.h> |
1da177e4 LT |
277 | #include <linux/stat.h> |
278 | #include <linux/cache.h> | |
279 | #include <linux/kobject.h> | |
280 | #include <linux/list.h> | |
281 | #include <linux/radix-tree.h> | |
282 | #include <linux/prio_tree.h> | |
283 | #include <linux/init.h> | |
914e2637 | 284 | #include <linux/pid.h> |
1b1dcc1b | 285 | #include <linux/mutex.h> |
3bd858ab | 286 | #include <linux/capability.h> |
1da177e4 LT |
287 | |
288 | #include <asm/atomic.h> | |
289 | #include <asm/semaphore.h> | |
290 | #include <asm/byteorder.h> | |
291 | ||
a5694255 | 292 | struct export_operations; |
a885c8c4 | 293 | struct hd_geometry; |
1da177e4 LT |
294 | struct iovec; |
295 | struct nameidata; | |
92198f7e | 296 | struct kiocb; |
1da177e4 LT |
297 | struct pipe_inode_info; |
298 | struct poll_table_struct; | |
299 | struct kstatfs; | |
300 | struct vm_area_struct; | |
301 | struct vfsmount; | |
302 | ||
74bf17cf | 303 | extern void __init inode_init(void); |
1da177e4 | 304 | extern void __init inode_init_early(void); |
74bf17cf | 305 | extern void __init mnt_init(void); |
1da177e4 LT |
306 | extern void __init files_init(unsigned long); |
307 | ||
308 | struct buffer_head; | |
309 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
310 | struct buffer_head *bh_result, int create); | |
92198f7e | 311 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
1da177e4 LT |
312 | ssize_t bytes, void *private); |
313 | ||
314 | /* | |
315 | * Attribute flags. These should be or-ed together to figure out what | |
316 | * has been changed! | |
317 | */ | |
318 | #define ATTR_MODE 1 | |
319 | #define ATTR_UID 2 | |
320 | #define ATTR_GID 4 | |
321 | #define ATTR_SIZE 8 | |
322 | #define ATTR_ATIME 16 | |
323 | #define ATTR_MTIME 32 | |
324 | #define ATTR_CTIME 64 | |
325 | #define ATTR_ATIME_SET 128 | |
326 | #define ATTR_MTIME_SET 256 | |
327 | #define ATTR_FORCE 512 /* Not a change, but a change it */ | |
328 | #define ATTR_ATTR_FLAG 1024 | |
329 | #define ATTR_KILL_SUID 2048 | |
330 | #define ATTR_KILL_SGID 4096 | |
cc4e69de | 331 | #define ATTR_FILE 8192 |
1da177e4 LT |
332 | |
333 | /* | |
334 | * This is the Inode Attributes structure, used for notify_change(). It | |
335 | * uses the above definitions as flags, to know which values have changed. | |
336 | * Also, in this manner, a Filesystem can look at only the values it cares | |
337 | * about. Basically, these are the attributes that the VFS layer can | |
338 | * request to change from the FS layer. | |
339 | * | |
340 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
341 | */ | |
342 | struct iattr { | |
343 | unsigned int ia_valid; | |
344 | umode_t ia_mode; | |
345 | uid_t ia_uid; | |
346 | gid_t ia_gid; | |
347 | loff_t ia_size; | |
348 | struct timespec ia_atime; | |
349 | struct timespec ia_mtime; | |
350 | struct timespec ia_ctime; | |
cc4e69de MS |
351 | |
352 | /* | |
353 | * Not an attribute, but an auxilary info for filesystems wanting to | |
354 | * implement an ftruncate() like method. NOTE: filesystem should | |
355 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
356 | */ | |
357 | struct file *ia_file; | |
1da177e4 LT |
358 | }; |
359 | ||
1da177e4 LT |
360 | /* |
361 | * Includes for diskquotas. | |
362 | */ | |
363 | #include <linux/quota.h> | |
364 | ||
994fc28c ZB |
365 | /** |
366 | * enum positive_aop_returns - aop return codes with specific semantics | |
367 | * | |
368 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
369 | * completed, that the page is still locked, and | |
370 | * should be considered active. The VM uses this hint | |
371 | * to return the page to the active list -- it won't | |
372 | * be a candidate for writeback again in the near | |
373 | * future. Other callers must be careful to unlock | |
374 | * the page if they get this return. Returned by | |
375 | * writepage(); | |
376 | * | |
377 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
378 | * unlocked it and the page might have been truncated. | |
379 | * The caller should back up to acquiring a new page and | |
380 | * trying again. The aop will be taking reasonable | |
381 | * precautions not to livelock. If the caller held a page | |
382 | * reference, it should drop it before retrying. Returned | |
55144768 | 383 | * by readpage(). |
994fc28c ZB |
384 | * |
385 | * address_space_operation functions return these large constants to indicate | |
386 | * special semantics to the caller. These are much larger than the bytes in a | |
387 | * page to allow for functions that return the number of bytes operated on in a | |
388 | * given page. | |
389 | */ | |
390 | ||
391 | enum positive_aop_returns { | |
392 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
393 | AOP_TRUNCATED_PAGE = 0x80001, | |
394 | }; | |
395 | ||
afddba49 | 396 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
89e10787 | 397 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
afddba49 | 398 | |
1da177e4 LT |
399 | /* |
400 | * oh the beauties of C type declarations. | |
401 | */ | |
402 | struct page; | |
403 | struct address_space; | |
404 | struct writeback_control; | |
1da177e4 | 405 | |
2f718ffc NP |
406 | struct iov_iter { |
407 | const struct iovec *iov; | |
408 | unsigned long nr_segs; | |
409 | size_t iov_offset; | |
410 | size_t count; | |
411 | }; | |
412 | ||
413 | size_t iov_iter_copy_from_user_atomic(struct page *page, | |
414 | struct iov_iter *i, unsigned long offset, size_t bytes); | |
415 | size_t iov_iter_copy_from_user(struct page *page, | |
416 | struct iov_iter *i, unsigned long offset, size_t bytes); | |
417 | void iov_iter_advance(struct iov_iter *i, size_t bytes); | |
afddba49 | 418 | int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); |
2f718ffc NP |
419 | size_t iov_iter_single_seg_count(struct iov_iter *i); |
420 | ||
421 | static inline void iov_iter_init(struct iov_iter *i, | |
422 | const struct iovec *iov, unsigned long nr_segs, | |
423 | size_t count, size_t written) | |
424 | { | |
425 | i->iov = iov; | |
426 | i->nr_segs = nr_segs; | |
427 | i->iov_offset = 0; | |
428 | i->count = count + written; | |
429 | ||
430 | iov_iter_advance(i, written); | |
431 | } | |
432 | ||
433 | static inline size_t iov_iter_count(struct iov_iter *i) | |
434 | { | |
435 | return i->count; | |
436 | } | |
437 | ||
438 | ||
1da177e4 LT |
439 | struct address_space_operations { |
440 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
441 | int (*readpage)(struct file *, struct page *); | |
3978d717 | 442 | void (*sync_page)(struct page *); |
1da177e4 LT |
443 | |
444 | /* Write back some dirty pages from this mapping. */ | |
445 | int (*writepages)(struct address_space *, struct writeback_control *); | |
446 | ||
4741c9fd | 447 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
448 | int (*set_page_dirty)(struct page *page); |
449 | ||
450 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
451 | struct list_head *pages, unsigned nr_pages); | |
452 | ||
453 | /* | |
454 | * ext3 requires that a successful prepare_write() call be followed | |
455 | * by a commit_write() call - they must be balanced | |
456 | */ | |
457 | int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); | |
458 | int (*commit_write)(struct file *, struct page *, unsigned, unsigned); | |
afddba49 NP |
459 | |
460 | int (*write_begin)(struct file *, struct address_space *mapping, | |
461 | loff_t pos, unsigned len, unsigned flags, | |
462 | struct page **pagep, void **fsdata); | |
463 | int (*write_end)(struct file *, struct address_space *mapping, | |
464 | loff_t pos, unsigned len, unsigned copied, | |
465 | struct page *page, void *fsdata); | |
466 | ||
1da177e4 LT |
467 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
468 | sector_t (*bmap)(struct address_space *, sector_t); | |
2ff28e22 | 469 | void (*invalidatepage) (struct page *, unsigned long); |
27496a8c | 470 | int (*releasepage) (struct page *, gfp_t); |
1da177e4 LT |
471 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
472 | loff_t offset, unsigned long nr_segs); | |
ceffc078 CO |
473 | struct page* (*get_xip_page)(struct address_space *, sector_t, |
474 | int); | |
e965f963 | 475 | /* migrate the contents of a page to the specified target */ |
2d1db3b1 CL |
476 | int (*migratepage) (struct address_space *, |
477 | struct page *, struct page *); | |
e3db7691 | 478 | int (*launder_page) (struct page *); |
1da177e4 LT |
479 | }; |
480 | ||
afddba49 NP |
481 | /* |
482 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
483 | * to write into the pagecache. | |
484 | */ | |
485 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
486 | loff_t pos, unsigned len, unsigned flags, | |
487 | struct page **pagep, void **fsdata); | |
488 | ||
489 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
490 | loff_t pos, unsigned len, unsigned copied, | |
491 | struct page *page, void *fsdata); | |
492 | ||
1da177e4 LT |
493 | struct backing_dev_info; |
494 | struct address_space { | |
495 | struct inode *host; /* owner: inode, block_device */ | |
496 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
497 | rwlock_t tree_lock; /* and rwlock protecting it */ | |
498 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ | |
499 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ | |
500 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ | |
501 | spinlock_t i_mmap_lock; /* protect tree, count, list */ | |
502 | unsigned int truncate_count; /* Cover race condition with truncate */ | |
503 | unsigned long nrpages; /* number of total pages */ | |
504 | pgoff_t writeback_index;/* writeback starts here */ | |
f5e54d6e | 505 | const struct address_space_operations *a_ops; /* methods */ |
1da177e4 LT |
506 | unsigned long flags; /* error bits/gfp mask */ |
507 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ | |
508 | spinlock_t private_lock; /* for use by the address_space */ | |
509 | struct list_head private_list; /* ditto */ | |
510 | struct address_space *assoc_mapping; /* ditto */ | |
511 | } __attribute__((aligned(sizeof(long)))); | |
512 | /* | |
513 | * On most architectures that alignment is already the case; but | |
514 | * must be enforced here for CRIS, to let the least signficant bit | |
515 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. | |
516 | */ | |
517 | ||
518 | struct block_device { | |
519 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
520 | struct inode * bd_inode; /* will die */ | |
521 | int bd_openers; | |
c039e313 | 522 | struct mutex bd_mutex; /* open/close mutex */ |
f73ca1b7 | 523 | struct semaphore bd_mount_sem; |
1da177e4 LT |
524 | struct list_head bd_inodes; |
525 | void * bd_holder; | |
526 | int bd_holders; | |
641dc636 JN |
527 | #ifdef CONFIG_SYSFS |
528 | struct list_head bd_holder_list; | |
529 | #endif | |
1da177e4 LT |
530 | struct block_device * bd_contains; |
531 | unsigned bd_block_size; | |
532 | struct hd_struct * bd_part; | |
533 | /* number of times partitions within this device have been opened. */ | |
534 | unsigned bd_part_count; | |
535 | int bd_invalidated; | |
536 | struct gendisk * bd_disk; | |
537 | struct list_head bd_list; | |
538 | struct backing_dev_info *bd_inode_backing_dev_info; | |
539 | /* | |
540 | * Private data. You must have bd_claim'ed the block_device | |
541 | * to use this. NOTE: bd_claim allows an owner to claim | |
542 | * the same device multiple times, the owner must take special | |
543 | * care to not mess up bd_private for that case. | |
544 | */ | |
545 | unsigned long bd_private; | |
546 | }; | |
547 | ||
548 | /* | |
549 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
550 | * radix trees | |
551 | */ | |
552 | #define PAGECACHE_TAG_DIRTY 0 | |
553 | #define PAGECACHE_TAG_WRITEBACK 1 | |
554 | ||
555 | int mapping_tagged(struct address_space *mapping, int tag); | |
556 | ||
557 | /* | |
558 | * Might pages of this file be mapped into userspace? | |
559 | */ | |
560 | static inline int mapping_mapped(struct address_space *mapping) | |
561 | { | |
562 | return !prio_tree_empty(&mapping->i_mmap) || | |
563 | !list_empty(&mapping->i_mmap_nonlinear); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Might pages of this file have been modified in userspace? | |
568 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
569 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
570 | * writing i.e. vma may be mprotected writable even if now readonly. | |
571 | */ | |
572 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
573 | { | |
574 | return mapping->i_mmap_writable != 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
579 | */ | |
580 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
581 | #include <linux/seqlock.h> | |
582 | #define __NEED_I_SIZE_ORDERED | |
583 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
584 | #else | |
585 | #define i_size_ordered_init(inode) do { } while (0) | |
586 | #endif | |
587 | ||
588 | struct inode { | |
589 | struct hlist_node i_hash; | |
590 | struct list_head i_list; | |
591 | struct list_head i_sb_list; | |
592 | struct list_head i_dentry; | |
593 | unsigned long i_ino; | |
594 | atomic_t i_count; | |
1da177e4 LT |
595 | unsigned int i_nlink; |
596 | uid_t i_uid; | |
597 | gid_t i_gid; | |
598 | dev_t i_rdev; | |
83b7b44e | 599 | unsigned long i_version; |
1da177e4 | 600 | loff_t i_size; |
83b7b44e ED |
601 | #ifdef __NEED_I_SIZE_ORDERED |
602 | seqcount_t i_size_seqcount; | |
603 | #endif | |
1da177e4 LT |
604 | struct timespec i_atime; |
605 | struct timespec i_mtime; | |
606 | struct timespec i_ctime; | |
607 | unsigned int i_blkbits; | |
a0f62ac6 | 608 | blkcnt_t i_blocks; |
1da177e4 | 609 | unsigned short i_bytes; |
12d40e43 | 610 | umode_t i_mode; |
1da177e4 | 611 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
1b1dcc1b | 612 | struct mutex i_mutex; |
1da177e4 | 613 | struct rw_semaphore i_alloc_sem; |
c5ef1c42 | 614 | const struct inode_operations *i_op; |
99ac48f5 | 615 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
1da177e4 LT |
616 | struct super_block *i_sb; |
617 | struct file_lock *i_flock; | |
618 | struct address_space *i_mapping; | |
619 | struct address_space i_data; | |
620 | #ifdef CONFIG_QUOTA | |
621 | struct dquot *i_dquot[MAXQUOTAS]; | |
622 | #endif | |
1da177e4 | 623 | struct list_head i_devices; |
4c154168 TT |
624 | union { |
625 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 626 | struct block_device *i_bdev; |
577c4eb0 | 627 | struct cdev *i_cdev; |
4c154168 | 628 | }; |
1da177e4 LT |
629 | int i_cindex; |
630 | ||
631 | __u32 i_generation; | |
632 | ||
633 | #ifdef CONFIG_DNOTIFY | |
634 | unsigned long i_dnotify_mask; /* Directory notify events */ | |
635 | struct dnotify_struct *i_dnotify; /* for directory notifications */ | |
636 | #endif | |
637 | ||
0eeca283 RL |
638 | #ifdef CONFIG_INOTIFY |
639 | struct list_head inotify_watches; /* watches on this inode */ | |
d4f9af9d | 640 | struct mutex inotify_mutex; /* protects the watches list */ |
0eeca283 RL |
641 | #endif |
642 | ||
1da177e4 LT |
643 | unsigned long i_state; |
644 | unsigned long dirtied_when; /* jiffies of first dirtying */ | |
645 | ||
646 | unsigned int i_flags; | |
647 | ||
648 | atomic_t i_writecount; | |
50462062 | 649 | #ifdef CONFIG_SECURITY |
1da177e4 | 650 | void *i_security; |
50462062 | 651 | #endif |
8e18e294 | 652 | void *i_private; /* fs or device private pointer */ |
1da177e4 LT |
653 | }; |
654 | ||
f2eace23 IM |
655 | /* |
656 | * inode->i_mutex nesting subclasses for the lock validator: | |
657 | * | |
658 | * 0: the object of the current VFS operation | |
659 | * 1: parent | |
660 | * 2: child/target | |
661 | * 3: quota file | |
662 | * | |
663 | * The locking order between these classes is | |
4df46240 | 664 | * parent -> child -> normal -> xattr -> quota |
f2eace23 IM |
665 | */ |
666 | enum inode_i_mutex_lock_class | |
667 | { | |
668 | I_MUTEX_NORMAL, | |
669 | I_MUTEX_PARENT, | |
670 | I_MUTEX_CHILD, | |
4df46240 | 671 | I_MUTEX_XATTR, |
f2eace23 IM |
672 | I_MUTEX_QUOTA |
673 | }; | |
674 | ||
62752ee1 MF |
675 | extern void inode_double_lock(struct inode *inode1, struct inode *inode2); |
676 | extern void inode_double_unlock(struct inode *inode1, struct inode *inode2); | |
677 | ||
1da177e4 LT |
678 | /* |
679 | * NOTE: in a 32bit arch with a preemptable kernel and | |
680 | * an UP compile the i_size_read/write must be atomic | |
681 | * with respect to the local cpu (unlike with preempt disabled), | |
682 | * but they don't need to be atomic with respect to other cpus like in | |
683 | * true SMP (so they need either to either locally disable irq around | |
684 | * the read or for example on x86 they can be still implemented as a | |
685 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
686 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
687 | */ | |
48ed214d | 688 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
689 | { |
690 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
691 | loff_t i_size; | |
692 | unsigned int seq; | |
693 | ||
694 | do { | |
695 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
696 | i_size = inode->i_size; | |
697 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
698 | return i_size; | |
699 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
700 | loff_t i_size; | |
701 | ||
702 | preempt_disable(); | |
703 | i_size = inode->i_size; | |
704 | preempt_enable(); | |
705 | return i_size; | |
706 | #else | |
707 | return inode->i_size; | |
708 | #endif | |
709 | } | |
710 | ||
7762f5a0 MS |
711 | /* |
712 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
713 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
714 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
715 | */ | |
1da177e4 LT |
716 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
717 | { | |
718 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
719 | write_seqcount_begin(&inode->i_size_seqcount); | |
720 | inode->i_size = i_size; | |
721 | write_seqcount_end(&inode->i_size_seqcount); | |
722 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
723 | preempt_disable(); | |
724 | inode->i_size = i_size; | |
725 | preempt_enable(); | |
726 | #else | |
727 | inode->i_size = i_size; | |
728 | #endif | |
729 | } | |
730 | ||
48ed214d | 731 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
732 | { |
733 | return MINOR(inode->i_rdev); | |
734 | } | |
735 | ||
48ed214d | 736 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
737 | { |
738 | return MAJOR(inode->i_rdev); | |
739 | } | |
740 | ||
741 | extern struct block_device *I_BDEV(struct inode *inode); | |
742 | ||
743 | struct fown_struct { | |
744 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
745 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
746 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
1da177e4 | 747 | uid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
748 | int signum; /* posix.1b rt signal to be delivered on IO */ |
749 | }; | |
750 | ||
751 | /* | |
752 | * Track a single file's readahead state | |
753 | */ | |
754 | struct file_ra_state { | |
937085aa FW |
755 | pgoff_t start; /* where readahead started */ |
756 | unsigned int size; /* # of readahead pages */ | |
757 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 758 | there are only # of pages ahead */ |
5ce1110b | 759 | |
937085aa | 760 | unsigned int ra_pages; /* Maximum readahead window */ |
0bb7ba6b | 761 | int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 762 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 763 | }; |
1da177e4 | 764 | |
5ce1110b FW |
765 | /* |
766 | * Check if @index falls in the readahead windows. | |
767 | */ | |
768 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
769 | { | |
f9acc8c7 FW |
770 | return (index >= ra->start && |
771 | index < ra->start + ra->size); | |
5ce1110b FW |
772 | } |
773 | ||
1da177e4 | 774 | struct file { |
2f512016 ED |
775 | /* |
776 | * fu_list becomes invalid after file_free is called and queued via | |
777 | * fu_rcuhead for RCU freeing | |
778 | */ | |
779 | union { | |
780 | struct list_head fu_list; | |
781 | struct rcu_head fu_rcuhead; | |
782 | } f_u; | |
0f7fc9e4 JJS |
783 | struct path f_path; |
784 | #define f_dentry f_path.dentry | |
785 | #define f_vfsmnt f_path.mnt | |
99ac48f5 | 786 | const struct file_operations *f_op; |
1da177e4 LT |
787 | atomic_t f_count; |
788 | unsigned int f_flags; | |
789 | mode_t f_mode; | |
1da177e4 LT |
790 | loff_t f_pos; |
791 | struct fown_struct f_owner; | |
792 | unsigned int f_uid, f_gid; | |
793 | struct file_ra_state f_ra; | |
794 | ||
2b47c361 | 795 | u64 f_version; |
50462062 | 796 | #ifdef CONFIG_SECURITY |
1da177e4 | 797 | void *f_security; |
50462062 | 798 | #endif |
1da177e4 LT |
799 | /* needed for tty driver, and maybe others */ |
800 | void *private_data; | |
801 | ||
802 | #ifdef CONFIG_EPOLL | |
803 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
804 | struct list_head f_ep_links; | |
805 | spinlock_t f_ep_lock; | |
806 | #endif /* #ifdef CONFIG_EPOLL */ | |
807 | struct address_space *f_mapping; | |
808 | }; | |
809 | extern spinlock_t files_lock; | |
810 | #define file_list_lock() spin_lock(&files_lock); | |
811 | #define file_list_unlock() spin_unlock(&files_lock); | |
812 | ||
095975da | 813 | #define get_file(x) atomic_inc(&(x)->f_count) |
1da177e4 LT |
814 | #define file_count(x) atomic_read(&(x)->f_count) |
815 | ||
816 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
817 | ||
818 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
819 | limits, otherwise bad things can happen in VM. */ | |
820 | #if BITS_PER_LONG==32 | |
821 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) | |
822 | #elif BITS_PER_LONG==64 | |
823 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL | |
824 | #endif | |
825 | ||
826 | #define FL_POSIX 1 | |
827 | #define FL_FLOCK 2 | |
828 | #define FL_ACCESS 8 /* not trying to lock, just looking */ | |
f475ae95 | 829 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 830 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 831 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 LT |
832 | #define FL_SLEEP 128 /* A blocking lock */ |
833 | ||
834 | /* | |
835 | * The POSIX file lock owner is determined by | |
836 | * the "struct files_struct" in the thread group | |
837 | * (or NULL for no owner - BSD locks). | |
838 | * | |
839 | * Lockd stuffs a "host" pointer into this. | |
840 | */ | |
841 | typedef struct files_struct *fl_owner_t; | |
842 | ||
843 | struct file_lock_operations { | |
844 | void (*fl_insert)(struct file_lock *); /* lock insertion callback */ | |
845 | void (*fl_remove)(struct file_lock *); /* lock removal callback */ | |
846 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
847 | void (*fl_release_private)(struct file_lock *); | |
848 | }; | |
849 | ||
850 | struct lock_manager_operations { | |
851 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); | |
852 | void (*fl_notify)(struct file_lock *); /* unblock callback */ | |
2beb6614 | 853 | int (*fl_grant)(struct file_lock *, struct file_lock *, int); |
1da177e4 LT |
854 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
855 | void (*fl_release_private)(struct file_lock *); | |
856 | void (*fl_break)(struct file_lock *); | |
857 | int (*fl_mylease)(struct file_lock *, struct file_lock *); | |
858 | int (*fl_change)(struct file_lock **, int); | |
859 | }; | |
860 | ||
861 | /* that will die - we need it for nfs_lock_info */ | |
862 | #include <linux/nfs_fs_i.h> | |
863 | ||
864 | struct file_lock { | |
865 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
866 | struct list_head fl_link; /* doubly linked list of all locks */ | |
867 | struct list_head fl_block; /* circular list of blocked processes */ | |
868 | fl_owner_t fl_owner; | |
869 | unsigned int fl_pid; | |
870 | wait_queue_head_t fl_wait; | |
871 | struct file *fl_file; | |
872 | unsigned char fl_flags; | |
873 | unsigned char fl_type; | |
874 | loff_t fl_start; | |
875 | loff_t fl_end; | |
876 | ||
877 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
878 | unsigned long fl_break_time; /* for nonblocking lease breaks */ | |
879 | ||
880 | struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ | |
881 | struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ | |
882 | union { | |
883 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 884 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
885 | struct { |
886 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
887 | int state; /* state of grant or error if -ve */ | |
888 | } afs; | |
1da177e4 LT |
889 | } fl_u; |
890 | }; | |
891 | ||
892 | /* The following constant reflects the upper bound of the file/locking space */ | |
893 | #ifndef OFFSET_MAX | |
894 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
895 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
896 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
897 | #endif | |
898 | ||
1da177e4 LT |
899 | #include <linux/fcntl.h> |
900 | ||
901 | extern int fcntl_getlk(struct file *, struct flock __user *); | |
c293621b PS |
902 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
903 | struct flock __user *); | |
1da177e4 LT |
904 | |
905 | #if BITS_PER_LONG == 32 | |
906 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); | |
c293621b PS |
907 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
908 | struct flock64 __user *); | |
1da177e4 LT |
909 | #endif |
910 | ||
911 | extern void send_sigio(struct fown_struct *fown, int fd, int band); | |
912 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); | |
913 | extern int fcntl_getlease(struct file *filp); | |
914 | ||
f79e2abb | 915 | /* fs/sync.c */ |
5b04aa3a MF |
916 | extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset, |
917 | loff_t endbyte, unsigned int flags); | |
f79e2abb | 918 | |
1da177e4 LT |
919 | /* fs/locks.c */ |
920 | extern void locks_init_lock(struct file_lock *); | |
921 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); | |
922 | extern void locks_remove_posix(struct file *, fl_owner_t); | |
923 | extern void locks_remove_flock(struct file *); | |
6d34ac19 | 924 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 925 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
1da177e4 | 926 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
64a318ee | 927 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
3ee17abd | 928 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 929 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 930 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
1da177e4 LT |
931 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
932 | extern int __break_lease(struct inode *inode, unsigned int flags); | |
933 | extern void lease_get_mtime(struct inode *, struct timespec *time); | |
0af1a450 | 934 | extern int generic_setlease(struct file *, long, struct file_lock **); |
a9933cea | 935 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
1da177e4 LT |
936 | extern int lease_modify(struct file_lock **, int); |
937 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); | |
938 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); | |
7f8ada98 | 939 | extern struct seq_operations locks_seq_operations; |
1da177e4 LT |
940 | |
941 | struct fasync_struct { | |
942 | int magic; | |
943 | int fa_fd; | |
944 | struct fasync_struct *fa_next; /* singly linked list */ | |
945 | struct file *fa_file; | |
946 | }; | |
947 | ||
948 | #define FASYNC_MAGIC 0x4601 | |
949 | ||
950 | /* SMP safe fasync helpers: */ | |
951 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
952 | /* can be called from interrupts */ | |
953 | extern void kill_fasync(struct fasync_struct **, int, int); | |
954 | /* only for net: no internal synchronization */ | |
955 | extern void __kill_fasync(struct fasync_struct *, int, int); | |
956 | ||
609d7fa9 | 957 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1da177e4 LT |
958 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
959 | extern void f_delown(struct file *filp); | |
609d7fa9 | 960 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
961 | extern int send_sigurg(struct fown_struct *fown); |
962 | ||
963 | /* | |
964 | * Umount options | |
965 | */ | |
966 | ||
967 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
968 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
969 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
970 | ||
971 | extern struct list_head super_blocks; | |
972 | extern spinlock_t sb_lock; | |
973 | ||
974 | #define sb_entry(list) list_entry((list), struct super_block, s_list) | |
975 | #define S_BIAS (1<<30) | |
976 | struct super_block { | |
977 | struct list_head s_list; /* Keep this first */ | |
978 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
979 | unsigned long s_blocksize; | |
1da177e4 LT |
980 | unsigned char s_blocksize_bits; |
981 | unsigned char s_dirt; | |
982 | unsigned long long s_maxbytes; /* Max file size */ | |
983 | struct file_system_type *s_type; | |
ee9b6d61 | 984 | const struct super_operations *s_op; |
1da177e4 LT |
985 | struct dquot_operations *dq_op; |
986 | struct quotactl_ops *s_qcop; | |
987 | struct export_operations *s_export_op; | |
988 | unsigned long s_flags; | |
989 | unsigned long s_magic; | |
990 | struct dentry *s_root; | |
991 | struct rw_semaphore s_umount; | |
7892f2f4 | 992 | struct mutex s_lock; |
1da177e4 LT |
993 | int s_count; |
994 | int s_syncing; | |
995 | int s_need_sync_fs; | |
996 | atomic_t s_active; | |
50462062 | 997 | #ifdef CONFIG_SECURITY |
1da177e4 | 998 | void *s_security; |
50462062 | 999 | #endif |
1da177e4 LT |
1000 | struct xattr_handler **s_xattr; |
1001 | ||
1002 | struct list_head s_inodes; /* all inodes */ | |
1003 | struct list_head s_dirty; /* dirty inodes */ | |
1004 | struct list_head s_io; /* parked for writeback */ | |
0e0f4fc2 | 1005 | struct list_head s_more_io; /* parked for more writeback */ |
1da177e4 LT |
1006 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ |
1007 | struct list_head s_files; | |
1008 | ||
1009 | struct block_device *s_bdev; | |
acaebfd8 | 1010 | struct mtd_info *s_mtd; |
1da177e4 LT |
1011 | struct list_head s_instances; |
1012 | struct quota_info s_dquot; /* Diskquota specific options */ | |
1013 | ||
1014 | int s_frozen; | |
1015 | wait_queue_head_t s_wait_unfrozen; | |
1016 | ||
1017 | char s_id[32]; /* Informational name */ | |
1018 | ||
1019 | void *s_fs_info; /* Filesystem private info */ | |
1020 | ||
1021 | /* | |
1022 | * The next field is for VFS *only*. No filesystems have any business | |
1023 | * even looking at it. You had been warned. | |
1024 | */ | |
a11f3a05 | 1025 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1026 | |
8ba8e95e | 1027 | /* Granularity of c/m/atime in ns. |
1da177e4 LT |
1028 | Cannot be worse than a second */ |
1029 | u32 s_time_gran; | |
79c0b2df MS |
1030 | |
1031 | /* | |
1032 | * Filesystem subtype. If non-empty the filesystem type field | |
1033 | * in /proc/mounts will be "type.subtype" | |
1034 | */ | |
1035 | char *s_subtype; | |
1da177e4 LT |
1036 | }; |
1037 | ||
1038 | extern struct timespec current_fs_time(struct super_block *sb); | |
1039 | ||
1040 | /* | |
1041 | * Snapshotting support. | |
1042 | */ | |
1043 | enum { | |
1044 | SB_UNFROZEN = 0, | |
1045 | SB_FREEZE_WRITE = 1, | |
1046 | SB_FREEZE_TRANS = 2, | |
1047 | }; | |
1048 | ||
1049 | #define vfs_check_frozen(sb, level) \ | |
1050 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) | |
1051 | ||
914e2637 AV |
1052 | #define get_fs_excl() atomic_inc(¤t->fs_excl) |
1053 | #define put_fs_excl() atomic_dec(¤t->fs_excl) | |
1054 | #define has_fs_excl() atomic_read(¤t->fs_excl) | |
22e2c507 | 1055 | |
3bd858ab SS |
1056 | #define is_owner_or_cap(inode) \ |
1057 | ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER)) | |
1058 | ||
914e2637 AV |
1059 | /* not quite ready to be deprecated, but... */ |
1060 | extern void lock_super(struct super_block *); | |
1061 | extern void unlock_super(struct super_block *); | |
1da177e4 LT |
1062 | |
1063 | /* | |
1064 | * VFS helper functions.. | |
1065 | */ | |
e4543edd | 1066 | extern int vfs_permission(struct nameidata *, int); |
1da177e4 LT |
1067 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
1068 | extern int vfs_mkdir(struct inode *, struct dentry *, int); | |
1069 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
1070 | extern int vfs_symlink(struct inode *, struct dentry *, const char *, int); | |
1071 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); | |
1072 | extern int vfs_rmdir(struct inode *, struct dentry *); | |
1073 | extern int vfs_unlink(struct inode *, struct dentry *); | |
1074 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1075 | ||
1076 | /* | |
1077 | * VFS dentry helper functions. | |
1078 | */ | |
1079 | extern void dentry_unhash(struct dentry *dentry); | |
1080 | ||
8c744fb8 CH |
1081 | /* |
1082 | * VFS file helper functions. | |
1083 | */ | |
1084 | extern int file_permission(struct file *, int); | |
1085 | ||
1da177e4 LT |
1086 | /* |
1087 | * File types | |
1088 | * | |
1089 | * NOTE! These match bits 12..15 of stat.st_mode | |
1090 | * (ie "(i_mode >> 12) & 15"). | |
1091 | */ | |
1092 | #define DT_UNKNOWN 0 | |
1093 | #define DT_FIFO 1 | |
1094 | #define DT_CHR 2 | |
1095 | #define DT_DIR 4 | |
1096 | #define DT_BLK 6 | |
1097 | #define DT_REG 8 | |
1098 | #define DT_LNK 10 | |
1099 | #define DT_SOCK 12 | |
1100 | #define DT_WHT 14 | |
1101 | ||
1102 | #define OSYNC_METADATA (1<<0) | |
1103 | #define OSYNC_DATA (1<<1) | |
1104 | #define OSYNC_INODE (1<<2) | |
1105 | int generic_osync_inode(struct inode *, struct address_space *, int); | |
1106 | ||
1107 | /* | |
1108 | * This is the "filldir" function type, used by readdir() to let | |
1109 | * the kernel specify what kind of dirent layout it wants to have. | |
1110 | * This allows the kernel to read directories into kernel space or | |
1111 | * to have different dirent layouts depending on the binary type. | |
1112 | */ | |
afefdbb2 | 1113 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
1da177e4 LT |
1114 | |
1115 | struct block_device_operations { | |
1116 | int (*open) (struct inode *, struct file *); | |
1117 | int (*release) (struct inode *, struct file *); | |
1118 | int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); | |
bb93e3a5 | 1119 | long (*unlocked_ioctl) (struct file *, unsigned, unsigned long); |
1da177e4 | 1120 | long (*compat_ioctl) (struct file *, unsigned, unsigned long); |
420edbcc | 1121 | int (*direct_access) (struct block_device *, sector_t, unsigned long *); |
1da177e4 LT |
1122 | int (*media_changed) (struct gendisk *); |
1123 | int (*revalidate_disk) (struct gendisk *); | |
a885c8c4 | 1124 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
1da177e4 LT |
1125 | struct module *owner; |
1126 | }; | |
1127 | ||
1128 | /* | |
d96e6e71 | 1129 | * "descriptor" for what we're up to with a read. |
1da177e4 LT |
1130 | * This allows us to use the same read code yet |
1131 | * have multiple different users of the data that | |
1132 | * we read from a file. | |
1133 | * | |
1134 | * The simplest case just copies the data to user | |
1135 | * mode. | |
1136 | */ | |
1137 | typedef struct { | |
1138 | size_t written; | |
1139 | size_t count; | |
1140 | union { | |
1141 | char __user * buf; | |
1142 | void *data; | |
1143 | } arg; | |
1144 | int error; | |
1145 | } read_descriptor_t; | |
1146 | ||
1147 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); | |
1148 | ||
1149 | /* These macros are for out of kernel modules to test that | |
1150 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1151 | * fields in struct file_operations. */ | |
1152 | #define HAVE_COMPAT_IOCTL 1 | |
1153 | #define HAVE_UNLOCKED_IOCTL 1 | |
1154 | ||
1155 | /* | |
1156 | * NOTE: | |
1157 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl | |
1158 | * can be called without the big kernel lock held in all filesystems. | |
1159 | */ | |
1160 | struct file_operations { | |
1161 | struct module *owner; | |
1162 | loff_t (*llseek) (struct file *, loff_t, int); | |
1163 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1164 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
027445c3 BP |
1165 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1166 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); | |
1da177e4 LT |
1167 | int (*readdir) (struct file *, void *, filldir_t); |
1168 | unsigned int (*poll) (struct file *, struct poll_table_struct *); | |
1169 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); | |
1170 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); | |
1171 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1172 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1173 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1174 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 LT |
1175 | int (*release) (struct inode *, struct file *); |
1176 | int (*fsync) (struct file *, struct dentry *, int datasync); | |
1177 | int (*aio_fsync) (struct kiocb *, int datasync); | |
1178 | int (*fasync) (int, struct file *, int); | |
1179 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1180 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1181 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1182 | int (*check_flags)(int); | |
1183 | int (*dir_notify)(struct file *filp, unsigned long arg); | |
1184 | int (*flock) (struct file *, int, struct file_lock *); | |
cbb7e577 JA |
1185 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1186 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
f9ffed26 | 1187 | int (*setlease)(struct file *, long, struct file_lock **); |
1da177e4 LT |
1188 | }; |
1189 | ||
1190 | struct inode_operations { | |
1191 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); | |
1192 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); | |
1193 | int (*link) (struct dentry *,struct inode *,struct dentry *); | |
1194 | int (*unlink) (struct inode *,struct dentry *); | |
1195 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
1196 | int (*mkdir) (struct inode *,struct dentry *,int); | |
1197 | int (*rmdir) (struct inode *,struct dentry *); | |
1198 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); | |
1199 | int (*rename) (struct inode *, struct dentry *, | |
1200 | struct inode *, struct dentry *); | |
1201 | int (*readlink) (struct dentry *, char __user *,int); | |
cc314eef LT |
1202 | void * (*follow_link) (struct dentry *, struct nameidata *); |
1203 | void (*put_link) (struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
1204 | void (*truncate) (struct inode *); |
1205 | int (*permission) (struct inode *, int, struct nameidata *); | |
1206 | int (*setattr) (struct dentry *, struct iattr *); | |
1207 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1208 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); | |
1209 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); | |
1210 | ssize_t (*listxattr) (struct dentry *, char *, size_t); | |
1211 | int (*removexattr) (struct dentry *, const char *); | |
f6b3ec23 | 1212 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
97ac7350 AA |
1213 | long (*fallocate)(struct inode *inode, int mode, loff_t offset, |
1214 | loff_t len); | |
1da177e4 LT |
1215 | }; |
1216 | ||
1217 | struct seq_file; | |
1218 | ||
eed4e51f BP |
1219 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
1220 | unsigned long nr_segs, unsigned long fast_segs, | |
1221 | struct iovec *fast_pointer, | |
1222 | struct iovec **ret_pointer); | |
1223 | ||
1da177e4 LT |
1224 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1225 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1226 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
1227 | unsigned long, loff_t *); | |
1228 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, | |
1229 | unsigned long, loff_t *); | |
1230 | ||
1231 | /* | |
1232 | * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called | |
1233 | * without the big kernel lock held in all filesystems. | |
1234 | */ | |
1235 | struct super_operations { | |
1236 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1237 | void (*destroy_inode)(struct inode *); | |
1238 | ||
1239 | void (*read_inode) (struct inode *); | |
1240 | ||
1241 | void (*dirty_inode) (struct inode *); | |
1242 | int (*write_inode) (struct inode *, int); | |
1243 | void (*put_inode) (struct inode *); | |
1244 | void (*drop_inode) (struct inode *); | |
1245 | void (*delete_inode) (struct inode *); | |
1246 | void (*put_super) (struct super_block *); | |
1247 | void (*write_super) (struct super_block *); | |
1248 | int (*sync_fs)(struct super_block *sb, int wait); | |
1249 | void (*write_super_lockfs) (struct super_block *); | |
1250 | void (*unlockfs) (struct super_block *); | |
726c3342 | 1251 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 LT |
1252 | int (*remount_fs) (struct super_block *, int *, char *); |
1253 | void (*clear_inode) (struct inode *); | |
8b512d9a | 1254 | void (*umount_begin) (struct vfsmount *, int); |
1da177e4 LT |
1255 | |
1256 | int (*show_options)(struct seq_file *, struct vfsmount *); | |
b4629fe2 | 1257 | int (*show_stats)(struct seq_file *, struct vfsmount *); |
0e51a720 | 1258 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1259 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1260 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
0e51a720 | 1261 | #endif |
1da177e4 LT |
1262 | }; |
1263 | ||
1c0eeaf5 JE |
1264 | /* |
1265 | * Inode state bits. Protected by inode_lock. | |
1266 | * | |
1267 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1268 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1269 | * | |
1270 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1271 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1272 | * various stages of removing an inode. | |
1273 | * | |
1274 | * Two bits are used for locking and completion notification, I_LOCK and I_SYNC. | |
1275 | * | |
1276 | * I_DIRTY_SYNC Inode itself is dirty. | |
1277 | * I_DIRTY_DATASYNC Data-related inode changes pending | |
1278 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. | |
1279 | * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both | |
1280 | * are cleared by unlock_new_inode(), called from iget(). | |
1281 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count | |
1282 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1283 | * cleared. | |
1284 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1285 | * pages or buffers attached or the inode itself is still | |
1286 | * dirty. | |
1287 | * I_CLEAR Set by clear_inode(). In this state the inode is clean | |
1288 | * and can be destroyed. | |
1289 | * | |
1290 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1291 | * prohibited for many purposes. iget() must wait for | |
1292 | * the inode to be completely released, then create it | |
1293 | * anew. Other functions will just ignore such inodes, | |
1294 | * if appropriate. I_LOCK is used for waiting. | |
1295 | * | |
1296 | * I_LOCK Serves as both a mutex and completion notification. | |
1297 | * New inodes set I_LOCK. If two processes both create | |
1298 | * the same inode, one of them will release its inode and | |
1299 | * wait for I_LOCK to be released before returning. | |
1300 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1301 | * also cause waiting on I_LOCK, without I_LOCK actually | |
1302 | * being set. find_inode() uses this to prevent returning | |
1303 | * nearly-dead inodes. | |
1304 | * I_SYNC Similar to I_LOCK, but limited in scope to writeback | |
1305 | * of inode dirty data. Having a seperate lock for this | |
1306 | * purpose reduces latency and prevents some filesystem- | |
1307 | * specific deadlocks. | |
1308 | * | |
1309 | * Q: Why does I_DIRTY_DATASYNC exist? It appears as if it could be replaced | |
1310 | * by (I_DIRTY_SYNC|I_DIRTY_PAGES). | |
1311 | * Q: What is the difference between I_WILL_FREE and I_FREEING? | |
1312 | * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on | |
1313 | * I_CLEAR? If not, why? | |
1314 | */ | |
1315 | #define I_DIRTY_SYNC 1 | |
1316 | #define I_DIRTY_DATASYNC 2 | |
1317 | #define I_DIRTY_PAGES 4 | |
1318 | #define I_NEW 8 | |
1319 | #define I_WILL_FREE 16 | |
1320 | #define I_FREEING 32 | |
1321 | #define I_CLEAR 64 | |
1322 | #define __I_LOCK 7 | |
1da177e4 | 1323 | #define I_LOCK (1 << __I_LOCK) |
1c0eeaf5 JE |
1324 | #define __I_SYNC 8 |
1325 | #define I_SYNC (1 << __I_SYNC) | |
1da177e4 LT |
1326 | |
1327 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
1328 | ||
1329 | extern void __mark_inode_dirty(struct inode *, int); | |
1330 | static inline void mark_inode_dirty(struct inode *inode) | |
1331 | { | |
1332 | __mark_inode_dirty(inode, I_DIRTY); | |
1333 | } | |
1334 | ||
1335 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1336 | { | |
1337 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1338 | } | |
1339 | ||
71c42157 DH |
1340 | /** |
1341 | * inc_nlink - directly increment an inode's link count | |
1342 | * @inode: inode | |
1343 | * | |
1344 | * This is a low-level filesystem helper to replace any | |
1345 | * direct filesystem manipulation of i_nlink. Currently, | |
1346 | * it is only here for parity with dec_nlink(). | |
1347 | */ | |
d8c76e6f | 1348 | static inline void inc_nlink(struct inode *inode) |
66d21730 AD |
1349 | { |
1350 | inode->i_nlink++; | |
d8c76e6f DH |
1351 | } |
1352 | ||
1353 | static inline void inode_inc_link_count(struct inode *inode) | |
1354 | { | |
1355 | inc_nlink(inode); | |
66d21730 AD |
1356 | mark_inode_dirty(inode); |
1357 | } | |
1358 | ||
71c42157 DH |
1359 | /** |
1360 | * drop_nlink - directly drop an inode's link count | |
1361 | * @inode: inode | |
1362 | * | |
1363 | * This is a low-level filesystem helper to replace any | |
1364 | * direct filesystem manipulation of i_nlink. In cases | |
1365 | * where we are attempting to track writes to the | |
1366 | * filesystem, a decrement to zero means an imminent | |
1367 | * write when the file is truncated and actually unlinked | |
1368 | * on the filesystem. | |
1369 | */ | |
9a53c3a7 | 1370 | static inline void drop_nlink(struct inode *inode) |
66d21730 AD |
1371 | { |
1372 | inode->i_nlink--; | |
9a53c3a7 DH |
1373 | } |
1374 | ||
71c42157 DH |
1375 | /** |
1376 | * clear_nlink - directly zero an inode's link count | |
1377 | * @inode: inode | |
1378 | * | |
1379 | * This is a low-level filesystem helper to replace any | |
1380 | * direct filesystem manipulation of i_nlink. See | |
1381 | * drop_nlink() for why we care about i_nlink hitting zero. | |
1382 | */ | |
ce71ec36 DH |
1383 | static inline void clear_nlink(struct inode *inode) |
1384 | { | |
1385 | inode->i_nlink = 0; | |
1386 | } | |
1387 | ||
9a53c3a7 DH |
1388 | static inline void inode_dec_link_count(struct inode *inode) |
1389 | { | |
1390 | drop_nlink(inode); | |
66d21730 AD |
1391 | mark_inode_dirty(inode); |
1392 | } | |
1393 | ||
869243a0 | 1394 | extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
1da177e4 LT |
1395 | static inline void file_accessed(struct file *file) |
1396 | { | |
1397 | if (!(file->f_flags & O_NOATIME)) | |
0f7fc9e4 | 1398 | touch_atime(file->f_path.mnt, file->f_path.dentry); |
1da177e4 LT |
1399 | } |
1400 | ||
1401 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
1402 | ||
1da177e4 LT |
1403 | struct file_system_type { |
1404 | const char *name; | |
1405 | int fs_flags; | |
454e2398 DH |
1406 | int (*get_sb) (struct file_system_type *, int, |
1407 | const char *, void *, struct vfsmount *); | |
1da177e4 LT |
1408 | void (*kill_sb) (struct super_block *); |
1409 | struct module *owner; | |
1410 | struct file_system_type * next; | |
1411 | struct list_head fs_supers; | |
d475fd42 | 1412 | |
cf516249 | 1413 | struct lock_class_key s_lock_key; |
897c6ff9 | 1414 | struct lock_class_key s_umount_key; |
d475fd42 PZ |
1415 | |
1416 | struct lock_class_key i_lock_key; | |
1417 | struct lock_class_key i_mutex_key; | |
14358e6d | 1418 | struct lock_class_key i_mutex_dir_key; |
d475fd42 | 1419 | struct lock_class_key i_alloc_sem_key; |
1da177e4 LT |
1420 | }; |
1421 | ||
454e2398 | 1422 | extern int get_sb_bdev(struct file_system_type *fs_type, |
1da177e4 | 1423 | int flags, const char *dev_name, void *data, |
454e2398 DH |
1424 | int (*fill_super)(struct super_block *, void *, int), |
1425 | struct vfsmount *mnt); | |
1426 | extern int get_sb_single(struct file_system_type *fs_type, | |
1da177e4 | 1427 | int flags, void *data, |
454e2398 DH |
1428 | int (*fill_super)(struct super_block *, void *, int), |
1429 | struct vfsmount *mnt); | |
1430 | extern int get_sb_nodev(struct file_system_type *fs_type, | |
1da177e4 | 1431 | int flags, void *data, |
454e2398 DH |
1432 | int (*fill_super)(struct super_block *, void *, int), |
1433 | struct vfsmount *mnt); | |
1da177e4 LT |
1434 | void generic_shutdown_super(struct super_block *sb); |
1435 | void kill_block_super(struct super_block *sb); | |
1436 | void kill_anon_super(struct super_block *sb); | |
1437 | void kill_litter_super(struct super_block *sb); | |
1438 | void deactivate_super(struct super_block *sb); | |
1439 | int set_anon_super(struct super_block *s, void *data); | |
1440 | struct super_block *sget(struct file_system_type *type, | |
1441 | int (*test)(struct super_block *,void *), | |
1442 | int (*set)(struct super_block *,void *), | |
1443 | void *data); | |
454e2398 | 1444 | extern int get_sb_pseudo(struct file_system_type *, char *, |
ee9b6d61 | 1445 | const struct super_operations *ops, unsigned long, |
454e2398 DH |
1446 | struct vfsmount *mnt); |
1447 | extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); | |
1da177e4 LT |
1448 | int __put_super(struct super_block *sb); |
1449 | int __put_super_and_need_restart(struct super_block *sb); | |
1450 | void unnamed_dev_init(void); | |
1451 | ||
1452 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
1453 | #define fops_get(fops) \ | |
1454 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
1455 | #define fops_put(fops) \ | |
1456 | do { if (fops) module_put((fops)->owner); } while(0) | |
1457 | ||
1458 | extern int register_filesystem(struct file_system_type *); | |
1459 | extern int unregister_filesystem(struct file_system_type *); | |
1460 | extern struct vfsmount *kern_mount(struct file_system_type *); | |
1461 | extern int may_umount_tree(struct vfsmount *); | |
1462 | extern int may_umount(struct vfsmount *); | |
a05964f3 | 1463 | extern void umount_tree(struct vfsmount *, int, struct list_head *); |
b90fa9ae | 1464 | extern void release_mounts(struct list_head *); |
1da177e4 | 1465 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
b90fa9ae RP |
1466 | extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int); |
1467 | extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *, | |
1468 | struct vfsmount *); | |
1da177e4 | 1469 | |
726c3342 | 1470 | extern int vfs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 | 1471 | |
f87fd4c2 | 1472 | /* /sys/fs */ |
823bccfc | 1473 | extern struct kset fs_subsys; |
f87fd4c2 | 1474 | |
1da177e4 LT |
1475 | #define FLOCK_VERIFY_READ 1 |
1476 | #define FLOCK_VERIFY_WRITE 2 | |
1477 | ||
1478 | extern int locks_mandatory_locked(struct inode *); | |
1479 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); | |
1480 | ||
1481 | /* | |
1482 | * Candidates for mandatory locking have the setgid bit set | |
1483 | * but no group execute bit - an otherwise meaningless combination. | |
1484 | */ | |
a16877ca PE |
1485 | |
1486 | static inline int __mandatory_lock(struct inode *ino) | |
1487 | { | |
1488 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * ... and these candidates should be on MS_MANDLOCK mounted fs, | |
1493 | * otherwise these will be advisory locks | |
1494 | */ | |
1495 | ||
1496 | static inline int mandatory_lock(struct inode *ino) | |
1497 | { | |
1498 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
1499 | } | |
1da177e4 LT |
1500 | |
1501 | static inline int locks_verify_locked(struct inode *inode) | |
1502 | { | |
a16877ca | 1503 | if (mandatory_lock(inode)) |
1da177e4 LT |
1504 | return locks_mandatory_locked(inode); |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); | |
1509 | ||
1510 | static inline int locks_verify_truncate(struct inode *inode, | |
1511 | struct file *filp, | |
1512 | loff_t size) | |
1513 | { | |
a16877ca | 1514 | if (inode->i_flock && mandatory_lock(inode)) |
1da177e4 LT |
1515 | return locks_mandatory_area( |
1516 | FLOCK_VERIFY_WRITE, inode, filp, | |
1517 | size < inode->i_size ? size : inode->i_size, | |
1518 | (size < inode->i_size ? inode->i_size - size | |
1519 | : size - inode->i_size) | |
1520 | ); | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
1525 | { | |
1526 | if (inode->i_flock) | |
1527 | return __break_lease(inode, mode); | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | /* fs/open.c */ | |
1532 | ||
4a30131e N |
1533 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
1534 | struct file *filp); | |
5590ff0d UD |
1535 | extern long do_sys_open(int fdf, const char __user *filename, int flags, |
1536 | int mode); | |
1da177e4 LT |
1537 | extern struct file *filp_open(const char *, int, int); |
1538 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int); | |
1539 | extern int filp_close(struct file *, fl_owner_t id); | |
1540 | extern char * getname(const char __user *); | |
1541 | ||
1542 | /* fs/dcache.c */ | |
1543 | extern void __init vfs_caches_init_early(void); | |
1544 | extern void __init vfs_caches_init(unsigned long); | |
1545 | ||
b86c089b CL |
1546 | extern struct kmem_cache *names_cachep; |
1547 | ||
e94b1766 | 1548 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
1da177e4 LT |
1549 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1550 | #ifndef CONFIG_AUDITSYSCALL | |
1551 | #define putname(name) __putname(name) | |
1552 | #else | |
1553 | extern void putname(const char *name); | |
1554 | #endif | |
1555 | ||
9361401e | 1556 | #ifdef CONFIG_BLOCK |
1da177e4 | 1557 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 1558 | extern void unregister_blkdev(unsigned int, const char *); |
1da177e4 LT |
1559 | extern struct block_device *bdget(dev_t); |
1560 | extern void bd_set_size(struct block_device *, loff_t size); | |
1561 | extern void bd_forget(struct inode *inode); | |
1562 | extern void bdput(struct block_device *); | |
1563 | extern struct block_device *open_by_devnum(dev_t, unsigned); | |
f5e54d6e | 1564 | extern const struct address_space_operations def_blk_aops; |
9361401e DH |
1565 | #else |
1566 | static inline void bd_forget(struct inode *inode) {} | |
1567 | #endif | |
1568 | extern const struct file_operations def_blk_fops; | |
4b6f5d20 AV |
1569 | extern const struct file_operations def_chr_fops; |
1570 | extern const struct file_operations bad_sock_fops; | |
1571 | extern const struct file_operations def_fifo_fops; | |
9361401e | 1572 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
1573 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
1574 | extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); | |
7006f6ec AK |
1575 | extern int blkdev_driver_ioctl(struct inode *inode, struct file *file, |
1576 | struct gendisk *disk, unsigned cmd, | |
1577 | unsigned long arg); | |
1da177e4 LT |
1578 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
1579 | extern int blkdev_get(struct block_device *, mode_t, unsigned); | |
1580 | extern int blkdev_put(struct block_device *); | |
1581 | extern int bd_claim(struct block_device *, void *); | |
1582 | extern void bd_release(struct block_device *); | |
641dc636 JN |
1583 | #ifdef CONFIG_SYSFS |
1584 | extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); | |
1585 | extern void bd_release_from_disk(struct block_device *, struct gendisk *); | |
1586 | #else | |
1587 | #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) | |
1588 | #define bd_release_from_disk(bdev, disk) bd_release(bdev) | |
1589 | #endif | |
9361401e | 1590 | #endif |
1da177e4 LT |
1591 | |
1592 | /* fs/char_dev.c */ | |
68eef3b4 | 1593 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
1594 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
1595 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1596 | extern int register_chrdev(unsigned int, const char *, | |
99ac48f5 | 1597 | const struct file_operations *); |
e53252d9 | 1598 | extern void unregister_chrdev(unsigned int, const char *); |
1da177e4 LT |
1599 | extern void unregister_chrdev_region(dev_t, unsigned); |
1600 | extern int chrdev_open(struct inode *, struct file *); | |
68eef3b4 | 1601 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 LT |
1602 | |
1603 | /* fs/block_dev.c */ | |
1604 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
9361401e DH |
1605 | |
1606 | #ifdef CONFIG_BLOCK | |
1607 | #define BLKDEV_MAJOR_HASH_SIZE 255 | |
1da177e4 LT |
1608 | extern const char *__bdevname(dev_t, char *buffer); |
1609 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
1610 | extern struct block_device *lookup_bdev(const char *); | |
1611 | extern struct block_device *open_bdev_excl(const char *, int, void *); | |
1612 | extern void close_bdev_excl(struct block_device *); | |
68eef3b4 | 1613 | extern void blkdev_show(struct seq_file *,off_t); |
9361401e DH |
1614 | #else |
1615 | #define BLKDEV_MAJOR_HASH_SIZE 0 | |
1616 | #endif | |
1da177e4 LT |
1617 | |
1618 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
1619 | ||
1620 | /* Invalid inode operations -- fs/bad_inode.c */ | |
1621 | extern void make_bad_inode(struct inode *); | |
1622 | extern int is_bad_inode(struct inode *); | |
1623 | ||
4b6f5d20 AV |
1624 | extern const struct file_operations read_fifo_fops; |
1625 | extern const struct file_operations write_fifo_fops; | |
1626 | extern const struct file_operations rdwr_fifo_fops; | |
1da177e4 LT |
1627 | |
1628 | extern int fs_may_remount_ro(struct super_block *); | |
1629 | ||
9361401e | 1630 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
1631 | /* |
1632 | * return READ, READA, or WRITE | |
1633 | */ | |
1634 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) | |
1635 | ||
1636 | /* | |
1637 | * return data direction, READ or WRITE | |
1638 | */ | |
1639 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) | |
1640 | ||
1641 | extern int check_disk_change(struct block_device *); | |
2ef41634 | 1642 | extern int __invalidate_device(struct block_device *); |
1da177e4 | 1643 | extern int invalidate_partition(struct gendisk *, int); |
9361401e DH |
1644 | #endif |
1645 | extern int invalidate_inodes(struct super_block *); | |
fc9a07e7 AM |
1646 | unsigned long __invalidate_mapping_pages(struct address_space *mapping, |
1647 | pgoff_t start, pgoff_t end, | |
1648 | bool be_atomic); | |
1da177e4 LT |
1649 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
1650 | pgoff_t start, pgoff_t end); | |
54bc4855 | 1651 | |
fc0ecff6 | 1652 | static inline unsigned long __deprecated |
54bc4855 AA |
1653 | invalidate_inode_pages(struct address_space *mapping) |
1654 | { | |
1655 | return invalidate_mapping_pages(mapping, 0, ~0UL); | |
1656 | } | |
1657 | ||
1da177e4 LT |
1658 | static inline void invalidate_remote_inode(struct inode *inode) |
1659 | { | |
1660 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
1661 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 1662 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
1663 | } |
1664 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
1665 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
1666 | pgoff_t start, pgoff_t end); | |
1667 | extern int write_inode_now(struct inode *, int); | |
1668 | extern int filemap_fdatawrite(struct address_space *); | |
1669 | extern int filemap_flush(struct address_space *); | |
1670 | extern int filemap_fdatawait(struct address_space *); | |
1671 | extern int filemap_write_and_wait(struct address_space *mapping); | |
1672 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
1673 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
1674 | extern int wait_on_page_writeback_range(struct address_space *mapping, |
1675 | pgoff_t start, pgoff_t end); | |
1676 | extern int __filemap_fdatawrite_range(struct address_space *mapping, | |
1677 | loff_t start, loff_t end, int sync_mode); | |
1678 | ||
18e79b40 | 1679 | extern long do_fsync(struct file *file, int datasync); |
1da177e4 LT |
1680 | extern void sync_supers(void); |
1681 | extern void sync_filesystems(int wait); | |
cf9a2ae8 | 1682 | extern void __fsync_super(struct super_block *sb); |
1da177e4 LT |
1683 | extern void emergency_sync(void); |
1684 | extern void emergency_remount(void); | |
1685 | extern int do_remount_sb(struct super_block *sb, int flags, | |
1686 | void *data, int force); | |
9361401e | 1687 | #ifdef CONFIG_BLOCK |
1da177e4 | 1688 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 1689 | #endif |
1da177e4 LT |
1690 | extern int notify_change(struct dentry *, struct iattr *); |
1691 | extern int permission(struct inode *, int, struct nameidata *); | |
1692 | extern int generic_permission(struct inode *, int, | |
1693 | int (*check_acl)(struct inode *, int)); | |
1694 | ||
1695 | extern int get_write_access(struct inode *); | |
1696 | extern int deny_write_access(struct file *); | |
1697 | static inline void put_write_access(struct inode * inode) | |
1698 | { | |
1699 | atomic_dec(&inode->i_writecount); | |
1700 | } | |
1701 | static inline void allow_write_access(struct file *file) | |
1702 | { | |
1703 | if (file) | |
0f7fc9e4 | 1704 | atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
1da177e4 LT |
1705 | } |
1706 | extern int do_pipe(int *); | |
d6cbd281 AK |
1707 | extern struct file *create_read_pipe(struct file *f); |
1708 | extern struct file *create_write_pipe(void); | |
1709 | extern void free_write_pipe(struct file *); | |
1da177e4 | 1710 | |
5590ff0d | 1711 | extern int open_namei(int dfd, const char *, int, int, struct nameidata *); |
1da177e4 LT |
1712 | extern int may_open(struct nameidata *, int, int); |
1713 | ||
1714 | extern int kernel_read(struct file *, unsigned long, char *, unsigned long); | |
1715 | extern struct file * open_exec(const char *); | |
1716 | ||
1717 | /* fs/dcache.c -- generic fs support functions */ | |
1718 | extern int is_subdir(struct dentry *, struct dentry *); | |
1719 | extern ino_t find_inode_number(struct dentry *, struct qstr *); | |
1720 | ||
1721 | #include <linux/err.h> | |
1722 | ||
1723 | /* needed for stackable file system support */ | |
1724 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); | |
1725 | ||
1726 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); | |
1727 | ||
1728 | extern void inode_init_once(struct inode *); | |
1729 | extern void iput(struct inode *); | |
1730 | extern struct inode * igrab(struct inode *); | |
1731 | extern ino_t iunique(struct super_block *, ino_t); | |
1732 | extern int inode_needs_sync(struct inode *inode); | |
1733 | extern void generic_delete_inode(struct inode *inode); | |
cb2c0233 | 1734 | extern void generic_drop_inode(struct inode *inode); |
1da177e4 | 1735 | |
88bd5121 AA |
1736 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
1737 | unsigned long hashval, int (*test)(struct inode *, void *), | |
1738 | void *data); | |
1da177e4 LT |
1739 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
1740 | int (*test)(struct inode *, void *), void *data); | |
1741 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
1742 | ||
1743 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
1744 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
1745 | extern void unlock_new_inode(struct inode *); | |
1746 | ||
1747 | static inline struct inode *iget(struct super_block *sb, unsigned long ino) | |
1748 | { | |
1749 | struct inode *inode = iget_locked(sb, ino); | |
1750 | ||
1751 | if (inode && (inode->i_state & I_NEW)) { | |
1752 | sb->s_op->read_inode(inode); | |
1753 | unlock_new_inode(inode); | |
1754 | } | |
1755 | ||
1756 | return inode; | |
1757 | } | |
1758 | ||
1759 | extern void __iget(struct inode * inode); | |
1760 | extern void clear_inode(struct inode *); | |
1761 | extern void destroy_inode(struct inode *); | |
1762 | extern struct inode *new_inode(struct super_block *); | |
01de85e0 JA |
1763 | extern int __remove_suid(struct dentry *, int); |
1764 | extern int should_remove_suid(struct dentry *); | |
1da177e4 | 1765 | extern int remove_suid(struct dentry *); |
1da177e4 LT |
1766 | |
1767 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
1768 | extern void remove_inode_hash(struct inode *); | |
1769 | static inline void insert_inode_hash(struct inode *inode) { | |
1770 | __insert_inode_hash(inode, inode->i_ino); | |
1771 | } | |
1772 | ||
1773 | extern struct file * get_empty_filp(void); | |
1774 | extern void file_move(struct file *f, struct list_head *list); | |
1775 | extern void file_kill(struct file *f); | |
9361401e | 1776 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
1777 | struct bio; |
1778 | extern void submit_bio(int, struct bio *); | |
1779 | extern int bdev_read_only(struct block_device *); | |
9361401e | 1780 | #endif |
1da177e4 LT |
1781 | extern int set_blocksize(struct block_device *, int); |
1782 | extern int sb_set_blocksize(struct super_block *, int); | |
1783 | extern int sb_min_blocksize(struct super_block *, int); | |
08d8e974 | 1784 | extern int sb_has_dirty_inodes(struct super_block *); |
1da177e4 LT |
1785 | |
1786 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
1787 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
1788 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1da177e4 | 1789 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
027445c3 | 1790 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
027445c3 | 1791 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1da177e4 | 1792 | extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, |
027445c3 | 1793 | unsigned long, loff_t); |
1da177e4 LT |
1794 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
1795 | unsigned long *, loff_t, loff_t *, size_t, size_t); | |
1796 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, | |
1797 | unsigned long, loff_t, loff_t *, size_t, ssize_t); | |
1798 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); | |
1799 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); | |
1da177e4 LT |
1800 | extern void do_generic_mapping_read(struct address_space *mapping, |
1801 | struct file_ra_state *, struct file *, | |
1802 | loff_t *, read_descriptor_t *, read_actor_t); | |
0ceb3314 DM |
1803 | extern int generic_segment_checks(const struct iovec *iov, |
1804 | unsigned long *nr_segs, size_t *count, int access_flags); | |
88e6faef AM |
1805 | |
1806 | /* fs/splice.c */ | |
cbb7e577 | 1807 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef AM |
1808 | struct pipe_inode_info *, size_t, unsigned int); |
1809 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, | |
cbb7e577 | 1810 | struct file *, loff_t *, size_t, unsigned int); |
6da61809 MF |
1811 | extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *, |
1812 | struct file *, loff_t *, size_t, unsigned int); | |
88e6faef | 1813 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 JA |
1814 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1815 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, | |
88e6faef AM |
1816 | size_t len, unsigned int flags); |
1817 | ||
1da177e4 LT |
1818 | extern void |
1819 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
1da177e4 LT |
1820 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
1821 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); | |
1822 | extern loff_t remote_llseek(struct file *file, loff_t offset, int origin); | |
1823 | extern int generic_file_open(struct inode * inode, struct file * filp); | |
1824 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
1825 | ||
ceffc078 | 1826 | #ifdef CONFIG_FS_XIP |
eb6fe0c3 CO |
1827 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
1828 | loff_t *ppos); | |
ceffc078 | 1829 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
eb6fe0c3 CO |
1830 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
1831 | size_t len, loff_t *ppos); | |
ceffc078 | 1832 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
6d79125b CO |
1833 | #else |
1834 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) | |
1835 | { | |
1836 | return 0; | |
1837 | } | |
ceffc078 CO |
1838 | #endif |
1839 | ||
1da177e4 LT |
1840 | static inline void do_generic_file_read(struct file * filp, loff_t *ppos, |
1841 | read_descriptor_t * desc, | |
1842 | read_actor_t actor) | |
1843 | { | |
1844 | do_generic_mapping_read(filp->f_mapping, | |
1845 | &filp->f_ra, | |
1846 | filp, | |
1847 | ppos, | |
1848 | desc, | |
1849 | actor); | |
1850 | } | |
1851 | ||
9361401e | 1852 | #ifdef CONFIG_BLOCK |
1da177e4 LT |
1853 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
1854 | struct block_device *bdev, const struct iovec *iov, loff_t offset, | |
1d8fa7a2 | 1855 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
1da177e4 LT |
1856 | int lock_type); |
1857 | ||
1858 | enum { | |
1859 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ | |
1860 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ | |
1861 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ | |
1862 | }; | |
1863 | ||
1864 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, | |
1865 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1866 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1867 | dio_iodone_t end_io) |
1868 | { | |
1869 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1870 | nr_segs, get_block, end_io, DIO_LOCKING); |
1da177e4 LT |
1871 | } |
1872 | ||
1873 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, | |
1874 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1875 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1876 | dio_iodone_t end_io) |
1877 | { | |
1878 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1879 | nr_segs, get_block, end_io, DIO_NO_LOCKING); |
1da177e4 LT |
1880 | } |
1881 | ||
1882 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, | |
1883 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1884 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1885 | dio_iodone_t end_io) |
1886 | { | |
1887 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1888 | nr_segs, get_block, end_io, DIO_OWN_LOCKING); |
1da177e4 | 1889 | } |
9361401e | 1890 | #endif |
1da177e4 | 1891 | |
4b6f5d20 | 1892 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
1893 | |
1894 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
1895 | ||
1896 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); | |
1897 | extern int vfs_follow_link(struct nameidata *, const char *); | |
1898 | extern int page_readlink(struct dentry *, char __user *, int); | |
cc314eef LT |
1899 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
1900 | extern void page_put_link(struct dentry *, struct nameidata *, void *); | |
0adb25d2 KK |
1901 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
1902 | gfp_t gfp_mask); | |
1da177e4 | 1903 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 1904 | extern const struct inode_operations page_symlink_inode_operations; |
1da177e4 LT |
1905 | extern int generic_readlink(struct dentry *, char __user *, int); |
1906 | extern void generic_fillattr(struct inode *, struct kstat *); | |
1907 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
1908 | void inode_add_bytes(struct inode *inode, loff_t bytes); | |
1909 | void inode_sub_bytes(struct inode *inode, loff_t bytes); | |
1910 | loff_t inode_get_bytes(struct inode *inode); | |
1911 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
1912 | ||
1913 | extern int vfs_readdir(struct file *, filldir_t, void *); | |
1914 | ||
1915 | extern int vfs_stat(char __user *, struct kstat *); | |
1916 | extern int vfs_lstat(char __user *, struct kstat *); | |
5590ff0d UD |
1917 | extern int vfs_stat_fd(int dfd, char __user *, struct kstat *); |
1918 | extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); | |
1da177e4 LT |
1919 | extern int vfs_fstat(unsigned int, struct kstat *); |
1920 | ||
1921 | extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); | |
1922 | ||
1923 | extern struct file_system_type *get_fs_type(const char *name); | |
1924 | extern struct super_block *get_super(struct block_device *); | |
1925 | extern struct super_block *user_get_super(dev_t); | |
1926 | extern void drop_super(struct super_block *sb); | |
1927 | ||
1928 | extern int dcache_dir_open(struct inode *, struct file *); | |
1929 | extern int dcache_dir_close(struct inode *, struct file *); | |
1930 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
1931 | extern int dcache_readdir(struct file *, void *, filldir_t); | |
1932 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
726c3342 | 1933 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
1934 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
1935 | extern int simple_unlink(struct inode *, struct dentry *); | |
1936 | extern int simple_rmdir(struct inode *, struct dentry *); | |
1937 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1938 | extern int simple_sync_file(struct file *, struct dentry *, int); | |
1939 | extern int simple_empty(struct dentry *); | |
1940 | extern int simple_readpage(struct file *file, struct page *page); | |
1941 | extern int simple_prepare_write(struct file *file, struct page *page, | |
1942 | unsigned offset, unsigned to); | |
afddba49 NP |
1943 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
1944 | loff_t pos, unsigned len, unsigned flags, | |
1945 | struct page **pagep, void **fsdata); | |
1946 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
1947 | loff_t pos, unsigned len, unsigned copied, | |
1948 | struct page *page, void *fsdata); | |
1da177e4 LT |
1949 | |
1950 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); | |
1951 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); | |
4b6f5d20 | 1952 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 1953 | extern const struct inode_operations simple_dir_inode_operations; |
4b6f5d20 | 1954 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 LT |
1955 | struct dentry *d_alloc_name(struct dentry *, const char *); |
1956 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); | |
1f5ce9e9 | 1957 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
1958 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
1959 | ||
1960 | extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); | |
1961 | ||
e965f963 | 1962 | #ifdef CONFIG_MIGRATION |
2d1db3b1 CL |
1963 | extern int buffer_migrate_page(struct address_space *, |
1964 | struct page *, struct page *); | |
e965f963 CL |
1965 | #else |
1966 | #define buffer_migrate_page NULL | |
1967 | #endif | |
1968 | ||
1da177e4 LT |
1969 | extern int inode_change_ok(struct inode *, struct iattr *); |
1970 | extern int __must_check inode_setattr(struct inode *, struct iattr *); | |
1971 | ||
870f4817 | 1972 | extern void file_update_time(struct file *file); |
1da177e4 LT |
1973 | |
1974 | static inline ino_t parent_ino(struct dentry *dentry) | |
1975 | { | |
1976 | ino_t res; | |
1977 | ||
1978 | spin_lock(&dentry->d_lock); | |
1979 | res = dentry->d_parent->d_inode->i_ino; | |
1980 | spin_unlock(&dentry->d_lock); | |
1981 | return res; | |
1982 | } | |
1983 | ||
1984 | /* kernel/fork.c */ | |
1985 | extern int unshare_files(void); | |
1986 | ||
1987 | /* Transaction based IO helpers */ | |
1988 | ||
1989 | /* | |
1990 | * An argresp is stored in an allocated page and holds the | |
1991 | * size of the argument or response, along with its content | |
1992 | */ | |
1993 | struct simple_transaction_argresp { | |
1994 | ssize_t size; | |
1995 | char data[0]; | |
1996 | }; | |
1997 | ||
1998 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
1999 | ||
2000 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
2001 | size_t size); | |
2002 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
2003 | size_t size, loff_t *pos); | |
2004 | int simple_transaction_release(struct inode *inode, struct file *file); | |
2005 | ||
2006 | static inline void simple_transaction_set(struct file *file, size_t n) | |
2007 | { | |
2008 | struct simple_transaction_argresp *ar = file->private_data; | |
2009 | ||
2010 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); | |
2011 | ||
2012 | /* | |
2013 | * The barrier ensures that ar->size will really remain zero until | |
2014 | * ar->data is ready for reading. | |
2015 | */ | |
2016 | smp_mb(); | |
2017 | ar->size = n; | |
2018 | } | |
2019 | ||
acaefc25 AB |
2020 | /* |
2021 | * simple attribute files | |
2022 | * | |
2023 | * These attributes behave similar to those in sysfs: | |
2024 | * | |
2025 | * Writing to an attribute immediately sets a value, an open file can be | |
2026 | * written to multiple times. | |
2027 | * | |
2028 | * Reading from an attribute creates a buffer from the value that might get | |
2029 | * read with multiple read calls. When the attribute has been read | |
2030 | * completely, no further read calls are possible until the file is opened | |
2031 | * again. | |
2032 | * | |
2033 | * All attributes contain a text representation of a numeric value | |
2034 | * that are accessed with the get() and set() functions. | |
2035 | */ | |
2036 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
2037 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
2038 | { \ | |
2039 | __simple_attr_check_format(__fmt, 0ull); \ | |
2040 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
2041 | } \ | |
2042 | static struct file_operations __fops = { \ | |
2043 | .owner = THIS_MODULE, \ | |
2044 | .open = __fops ## _open, \ | |
2045 | .release = simple_attr_close, \ | |
2046 | .read = simple_attr_read, \ | |
2047 | .write = simple_attr_write, \ | |
2048 | }; | |
2049 | ||
2050 | static inline void __attribute__((format(printf, 1, 2))) | |
2051 | __simple_attr_check_format(const char *fmt, ...) | |
2052 | { | |
2053 | /* don't do anything, just let the compiler check the arguments; */ | |
2054 | } | |
2055 | ||
2056 | int simple_attr_open(struct inode *inode, struct file *file, | |
2057 | u64 (*get)(void *), void (*set)(void *, u64), | |
2058 | const char *fmt); | |
2059 | int simple_attr_close(struct inode *inode, struct file *file); | |
2060 | ssize_t simple_attr_read(struct file *file, char __user *buf, | |
2061 | size_t len, loff_t *ppos); | |
2062 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
2063 | size_t len, loff_t *ppos); | |
2064 | ||
2065 | ||
1da177e4 LT |
2066 | #ifdef CONFIG_SECURITY |
2067 | static inline char *alloc_secdata(void) | |
2068 | { | |
2069 | return (char *)get_zeroed_page(GFP_KERNEL); | |
2070 | } | |
2071 | ||
2072 | static inline void free_secdata(void *secdata) | |
2073 | { | |
2074 | free_page((unsigned long)secdata); | |
2075 | } | |
2076 | #else | |
2077 | static inline char *alloc_secdata(void) | |
2078 | { | |
2079 | return (char *)1; | |
2080 | } | |
2081 | ||
2082 | static inline void free_secdata(void *secdata) | |
2083 | { } | |
2084 | #endif /* CONFIG_SECURITY */ | |
2085 | ||
4be28540 AD |
2086 | struct ctl_table; |
2087 | int proc_nr_files(struct ctl_table *table, int write, struct file *filp, | |
62239ac2 AB |
2088 | void __user *buffer, size_t *lenp, loff_t *ppos); |
2089 | ||
2090 | ||
1da177e4 LT |
2091 | #endif /* __KERNEL__ */ |
2092 | #endif /* _LINUX_FS_H */ |