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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 */ | |
33 | ||
1da177e4 LT |
34 | /* And dynamically-tunable limits and defaults: */ |
35 | struct files_stat_struct { | |
36 | int nr_files; /* read only */ | |
37 | int nr_free_files; /* read only */ | |
38 | int max_files; /* tunable */ | |
39 | }; | |
40 | extern struct files_stat_struct files_stat; | |
529bf6be | 41 | extern int get_max_files(void); |
1da177e4 LT |
42 | |
43 | struct inodes_stat_t { | |
44 | int nr_inodes; | |
45 | int nr_unused; | |
46 | int dummy[5]; | |
47 | }; | |
48 | extern struct inodes_stat_t inodes_stat; | |
49 | ||
50 | extern int leases_enable, lease_break_time; | |
51 | ||
52 | #ifdef CONFIG_DNOTIFY | |
53 | extern int dir_notify_enable; | |
54 | #endif | |
55 | ||
56 | #define NR_FILE 8192 /* this can well be larger on a larger system */ | |
57 | ||
58 | #define MAY_EXEC 1 | |
59 | #define MAY_WRITE 2 | |
60 | #define MAY_READ 4 | |
61 | #define MAY_APPEND 8 | |
62 | ||
63 | #define FMODE_READ 1 | |
64 | #define FMODE_WRITE 2 | |
65 | ||
66 | /* Internal kernel extensions */ | |
67 | #define FMODE_LSEEK 4 | |
68 | #define FMODE_PREAD 8 | |
69 | #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ | |
70 | ||
b500531e OD |
71 | /* File is being opened for execution. Primary users of this flag are |
72 | distributed filesystems that can use it to achieve correct ETXTBUSY | |
73 | behavior for cross-node execution/opening_for_writing of files */ | |
74 | #define FMODE_EXEC 16 | |
75 | ||
1da177e4 LT |
76 | #define RW_MASK 1 |
77 | #define RWA_MASK 2 | |
78 | #define READ 0 | |
79 | #define WRITE 1 | |
80 | #define READA 2 /* read-ahead - don't block if no resources */ | |
a7662236 | 81 | #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
1da177e4 | 82 | #define READ_SYNC (READ | (1 << BIO_RW_SYNC)) |
5404bc7a | 83 | #define READ_META (READ | (1 << BIO_RW_META)) |
1da177e4 LT |
84 | #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) |
85 | #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) | |
86 | ||
87 | #define SEL_IN 1 | |
88 | #define SEL_OUT 2 | |
89 | #define SEL_EX 4 | |
90 | ||
91 | /* public flags for file_system_type */ | |
92 | #define FS_REQUIRES_DEV 1 | |
93 | #define FS_BINARY_MOUNTDATA 2 | |
94 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ | |
349457cc MF |
95 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
96 | * during rename() internally. | |
97 | */ | |
98 | ||
1da177e4 LT |
99 | /* |
100 | * These are the fs-independent mount-flags: up to 32 flags are supported | |
101 | */ | |
102 | #define MS_RDONLY 1 /* Mount read-only */ | |
103 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |
104 | #define MS_NODEV 4 /* Disallow access to device special files */ | |
105 | #define MS_NOEXEC 8 /* Disallow program execution */ | |
106 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ | |
107 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ | |
108 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
109 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ | |
110 | #define MS_NOATIME 1024 /* Do not update access times. */ | |
111 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ | |
112 | #define MS_BIND 4096 | |
113 | #define MS_MOVE 8192 | |
114 | #define MS_REC 16384 | |
9b04c997 TT |
115 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
116 | MS_VERBOSE is deprecated. */ | |
117 | #define MS_SILENT 32768 | |
bf066c7d | 118 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
9676f0c6 | 119 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
07b20889 | 120 | #define MS_PRIVATE (1<<18) /* change to private */ |
a58b0eb8 | 121 | #define MS_SLAVE (1<<19) /* change to slave */ |
03e06e68 | 122 | #define MS_SHARED (1<<20) /* change to shared */ |
1da177e4 LT |
123 | #define MS_ACTIVE (1<<30) |
124 | #define MS_NOUSER (1<<31) | |
125 | ||
126 | /* | |
127 | * Superblock flags that can be altered by MS_REMOUNT | |
128 | */ | |
fc33a7bb | 129 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK) |
1da177e4 LT |
130 | |
131 | /* | |
132 | * Old magic mount flag and mask | |
133 | */ | |
134 | #define MS_MGC_VAL 0xC0ED0000 | |
135 | #define MS_MGC_MSK 0xffff0000 | |
136 | ||
137 | /* Inode flags - they have nothing to superblock flags now */ | |
138 | ||
139 | #define S_SYNC 1 /* Writes are synced at once */ | |
140 | #define S_NOATIME 2 /* Do not update access times */ | |
141 | #define S_APPEND 4 /* Append-only file */ | |
142 | #define S_IMMUTABLE 8 /* Immutable file */ | |
143 | #define S_DEAD 16 /* removed, but still open directory */ | |
144 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
145 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
146 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
147 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
148 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
149 | ||
150 | /* | |
151 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
152 | * flags just means all the inodes inherit those flags by default. It might be | |
153 | * possible to override it selectively if you really wanted to with some | |
154 | * ioctl() that is not currently implemented. | |
155 | * | |
156 | * Exception: MS_RDONLY is always applied to the entire file system. | |
157 | * | |
158 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
159 | * with files in use. This means that all of the inodes will not have their | |
160 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
161 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
162 | */ | |
163 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) | |
164 | ||
165 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
166 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
167 | ((inode)->i_flags & S_SYNC)) | |
168 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
169 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
170 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
171 | ||
172 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
173 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
174 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
175 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
176 | ||
177 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
178 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
179 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
180 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
181 | ||
182 | /* the read-only stuff doesn't really belong here, but any other place is | |
183 | probably as bad and I don't want to create yet another include file. */ | |
184 | ||
185 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ | |
186 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ | |
187 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ | |
188 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ | |
189 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ | |
190 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ | |
191 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ | |
192 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ | |
193 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ | |
194 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ | |
195 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ | |
196 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ | |
197 | #if 0 | |
198 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ | |
199 | ||
200 | /* Some people are morons. Do not use sizeof! */ | |
201 | ||
202 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ | |
203 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ | |
204 | /* This was here just to show that the number is taken - | |
205 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ | |
206 | #endif | |
207 | /* A jump here: 108-111 have been used for various private purposes. */ | |
208 | #define BLKBSZGET _IOR(0x12,112,size_t) | |
209 | #define BLKBSZSET _IOW(0x12,113,size_t) | |
210 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
2056a782 JA |
211 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
212 | #define BLKTRACESTART _IO(0x12,116) | |
213 | #define BLKTRACESTOP _IO(0x12,117) | |
214 | #define BLKTRACETEARDOWN _IO(0x12,118) | |
1da177e4 LT |
215 | |
216 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ | |
217 | #define FIBMAP _IO(0x00,1) /* bmap access */ | |
218 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ | |
219 | ||
e46e4903 AM |
220 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
221 | #define SYNC_FILE_RANGE_WRITE 2 | |
222 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 | |
223 | ||
1da177e4 LT |
224 | #ifdef __KERNEL__ |
225 | ||
226 | #include <linux/linkage.h> | |
227 | #include <linux/wait.h> | |
228 | #include <linux/types.h> | |
229 | #include <linux/kdev_t.h> | |
230 | #include <linux/dcache.h> | |
231 | #include <linux/stat.h> | |
232 | #include <linux/cache.h> | |
233 | #include <linux/kobject.h> | |
234 | #include <linux/list.h> | |
235 | #include <linux/radix-tree.h> | |
236 | #include <linux/prio_tree.h> | |
237 | #include <linux/init.h> | |
22e2c507 | 238 | #include <linux/sched.h> |
1b1dcc1b | 239 | #include <linux/mutex.h> |
1da177e4 LT |
240 | |
241 | #include <asm/atomic.h> | |
242 | #include <asm/semaphore.h> | |
243 | #include <asm/byteorder.h> | |
244 | ||
a885c8c4 | 245 | struct hd_geometry; |
1da177e4 LT |
246 | struct iovec; |
247 | struct nameidata; | |
92198f7e | 248 | struct kiocb; |
1da177e4 LT |
249 | struct pipe_inode_info; |
250 | struct poll_table_struct; | |
251 | struct kstatfs; | |
252 | struct vm_area_struct; | |
253 | struct vfsmount; | |
254 | ||
1da177e4 LT |
255 | extern void __init inode_init(unsigned long); |
256 | extern void __init inode_init_early(void); | |
257 | extern void __init mnt_init(unsigned long); | |
258 | extern void __init files_init(unsigned long); | |
259 | ||
260 | struct buffer_head; | |
261 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
262 | struct buffer_head *bh_result, int create); | |
92198f7e | 263 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
1da177e4 LT |
264 | ssize_t bytes, void *private); |
265 | ||
266 | /* | |
267 | * Attribute flags. These should be or-ed together to figure out what | |
268 | * has been changed! | |
269 | */ | |
270 | #define ATTR_MODE 1 | |
271 | #define ATTR_UID 2 | |
272 | #define ATTR_GID 4 | |
273 | #define ATTR_SIZE 8 | |
274 | #define ATTR_ATIME 16 | |
275 | #define ATTR_MTIME 32 | |
276 | #define ATTR_CTIME 64 | |
277 | #define ATTR_ATIME_SET 128 | |
278 | #define ATTR_MTIME_SET 256 | |
279 | #define ATTR_FORCE 512 /* Not a change, but a change it */ | |
280 | #define ATTR_ATTR_FLAG 1024 | |
281 | #define ATTR_KILL_SUID 2048 | |
282 | #define ATTR_KILL_SGID 4096 | |
cc4e69de | 283 | #define ATTR_FILE 8192 |
1da177e4 LT |
284 | |
285 | /* | |
286 | * This is the Inode Attributes structure, used for notify_change(). It | |
287 | * uses the above definitions as flags, to know which values have changed. | |
288 | * Also, in this manner, a Filesystem can look at only the values it cares | |
289 | * about. Basically, these are the attributes that the VFS layer can | |
290 | * request to change from the FS layer. | |
291 | * | |
292 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
293 | */ | |
294 | struct iattr { | |
295 | unsigned int ia_valid; | |
296 | umode_t ia_mode; | |
297 | uid_t ia_uid; | |
298 | gid_t ia_gid; | |
299 | loff_t ia_size; | |
300 | struct timespec ia_atime; | |
301 | struct timespec ia_mtime; | |
302 | struct timespec ia_ctime; | |
cc4e69de MS |
303 | |
304 | /* | |
305 | * Not an attribute, but an auxilary info for filesystems wanting to | |
306 | * implement an ftruncate() like method. NOTE: filesystem should | |
307 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
308 | */ | |
309 | struct file *ia_file; | |
1da177e4 LT |
310 | }; |
311 | ||
1da177e4 LT |
312 | /* |
313 | * Includes for diskquotas. | |
314 | */ | |
315 | #include <linux/quota.h> | |
316 | ||
994fc28c ZB |
317 | /** |
318 | * enum positive_aop_returns - aop return codes with specific semantics | |
319 | * | |
320 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
321 | * completed, that the page is still locked, and | |
322 | * should be considered active. The VM uses this hint | |
323 | * to return the page to the active list -- it won't | |
324 | * be a candidate for writeback again in the near | |
325 | * future. Other callers must be careful to unlock | |
326 | * the page if they get this return. Returned by | |
327 | * writepage(); | |
328 | * | |
329 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
330 | * unlocked it and the page might have been truncated. | |
331 | * The caller should back up to acquiring a new page and | |
332 | * trying again. The aop will be taking reasonable | |
333 | * precautions not to livelock. If the caller held a page | |
334 | * reference, it should drop it before retrying. Returned | |
335 | * by readpage(), prepare_write(), and commit_write(). | |
336 | * | |
337 | * address_space_operation functions return these large constants to indicate | |
338 | * special semantics to the caller. These are much larger than the bytes in a | |
339 | * page to allow for functions that return the number of bytes operated on in a | |
340 | * given page. | |
341 | */ | |
342 | ||
343 | enum positive_aop_returns { | |
344 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
345 | AOP_TRUNCATED_PAGE = 0x80001, | |
346 | }; | |
347 | ||
1da177e4 LT |
348 | /* |
349 | * oh the beauties of C type declarations. | |
350 | */ | |
351 | struct page; | |
352 | struct address_space; | |
353 | struct writeback_control; | |
1da177e4 LT |
354 | |
355 | struct address_space_operations { | |
356 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
357 | int (*readpage)(struct file *, struct page *); | |
3978d717 | 358 | void (*sync_page)(struct page *); |
1da177e4 LT |
359 | |
360 | /* Write back some dirty pages from this mapping. */ | |
361 | int (*writepages)(struct address_space *, struct writeback_control *); | |
362 | ||
4741c9fd | 363 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
364 | int (*set_page_dirty)(struct page *page); |
365 | ||
366 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
367 | struct list_head *pages, unsigned nr_pages); | |
368 | ||
369 | /* | |
370 | * ext3 requires that a successful prepare_write() call be followed | |
371 | * by a commit_write() call - they must be balanced | |
372 | */ | |
373 | int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); | |
374 | int (*commit_write)(struct file *, struct page *, unsigned, unsigned); | |
375 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ | |
376 | sector_t (*bmap)(struct address_space *, sector_t); | |
2ff28e22 | 377 | void (*invalidatepage) (struct page *, unsigned long); |
27496a8c | 378 | int (*releasepage) (struct page *, gfp_t); |
1da177e4 LT |
379 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
380 | loff_t offset, unsigned long nr_segs); | |
ceffc078 CO |
381 | struct page* (*get_xip_page)(struct address_space *, sector_t, |
382 | int); | |
e965f963 | 383 | /* migrate the contents of a page to the specified target */ |
2d1db3b1 CL |
384 | int (*migratepage) (struct address_space *, |
385 | struct page *, struct page *); | |
1da177e4 LT |
386 | }; |
387 | ||
388 | struct backing_dev_info; | |
389 | struct address_space { | |
390 | struct inode *host; /* owner: inode, block_device */ | |
391 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
392 | rwlock_t tree_lock; /* and rwlock protecting it */ | |
393 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ | |
394 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ | |
395 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ | |
396 | spinlock_t i_mmap_lock; /* protect tree, count, list */ | |
397 | unsigned int truncate_count; /* Cover race condition with truncate */ | |
398 | unsigned long nrpages; /* number of total pages */ | |
399 | pgoff_t writeback_index;/* writeback starts here */ | |
f5e54d6e | 400 | const struct address_space_operations *a_ops; /* methods */ |
1da177e4 LT |
401 | unsigned long flags; /* error bits/gfp mask */ |
402 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ | |
403 | spinlock_t private_lock; /* for use by the address_space */ | |
404 | struct list_head private_list; /* ditto */ | |
405 | struct address_space *assoc_mapping; /* ditto */ | |
406 | } __attribute__((aligned(sizeof(long)))); | |
407 | /* | |
408 | * On most architectures that alignment is already the case; but | |
409 | * must be enforced here for CRIS, to let the least signficant bit | |
410 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. | |
411 | */ | |
412 | ||
413 | struct block_device { | |
414 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
415 | struct inode * bd_inode; /* will die */ | |
416 | int bd_openers; | |
c039e313 AV |
417 | struct mutex bd_mutex; /* open/close mutex */ |
418 | struct mutex bd_mount_mutex; /* mount mutex */ | |
1da177e4 LT |
419 | struct list_head bd_inodes; |
420 | void * bd_holder; | |
421 | int bd_holders; | |
641dc636 JN |
422 | #ifdef CONFIG_SYSFS |
423 | struct list_head bd_holder_list; | |
424 | #endif | |
1da177e4 LT |
425 | struct block_device * bd_contains; |
426 | unsigned bd_block_size; | |
427 | struct hd_struct * bd_part; | |
428 | /* number of times partitions within this device have been opened. */ | |
429 | unsigned bd_part_count; | |
430 | int bd_invalidated; | |
431 | struct gendisk * bd_disk; | |
432 | struct list_head bd_list; | |
433 | struct backing_dev_info *bd_inode_backing_dev_info; | |
434 | /* | |
435 | * Private data. You must have bd_claim'ed the block_device | |
436 | * to use this. NOTE: bd_claim allows an owner to claim | |
437 | * the same device multiple times, the owner must take special | |
438 | * care to not mess up bd_private for that case. | |
439 | */ | |
440 | unsigned long bd_private; | |
441 | }; | |
442 | ||
663d440e IM |
443 | /* |
444 | * bdev->bd_mutex nesting subclasses for the lock validator: | |
445 | * | |
446 | * 0: normal | |
447 | * 1: 'whole' | |
448 | * 2: 'partition' | |
449 | */ | |
450 | enum bdev_bd_mutex_lock_class | |
451 | { | |
452 | BD_MUTEX_NORMAL, | |
453 | BD_MUTEX_WHOLE, | |
454 | BD_MUTEX_PARTITION | |
455 | }; | |
456 | ||
457 | ||
1da177e4 LT |
458 | /* |
459 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
460 | * radix trees | |
461 | */ | |
462 | #define PAGECACHE_TAG_DIRTY 0 | |
463 | #define PAGECACHE_TAG_WRITEBACK 1 | |
464 | ||
465 | int mapping_tagged(struct address_space *mapping, int tag); | |
466 | ||
467 | /* | |
468 | * Might pages of this file be mapped into userspace? | |
469 | */ | |
470 | static inline int mapping_mapped(struct address_space *mapping) | |
471 | { | |
472 | return !prio_tree_empty(&mapping->i_mmap) || | |
473 | !list_empty(&mapping->i_mmap_nonlinear); | |
474 | } | |
475 | ||
476 | /* | |
477 | * Might pages of this file have been modified in userspace? | |
478 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
479 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
480 | * writing i.e. vma may be mprotected writable even if now readonly. | |
481 | */ | |
482 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
483 | { | |
484 | return mapping->i_mmap_writable != 0; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
489 | */ | |
490 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
491 | #include <linux/seqlock.h> | |
492 | #define __NEED_I_SIZE_ORDERED | |
493 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
494 | #else | |
495 | #define i_size_ordered_init(inode) do { } while (0) | |
496 | #endif | |
497 | ||
498 | struct inode { | |
499 | struct hlist_node i_hash; | |
500 | struct list_head i_list; | |
501 | struct list_head i_sb_list; | |
502 | struct list_head i_dentry; | |
503 | unsigned long i_ino; | |
504 | atomic_t i_count; | |
505 | umode_t i_mode; | |
506 | unsigned int i_nlink; | |
507 | uid_t i_uid; | |
508 | gid_t i_gid; | |
509 | dev_t i_rdev; | |
510 | loff_t i_size; | |
511 | struct timespec i_atime; | |
512 | struct timespec i_mtime; | |
513 | struct timespec i_ctime; | |
514 | unsigned int i_blkbits; | |
1da177e4 | 515 | unsigned long i_version; |
a0f62ac6 | 516 | blkcnt_t i_blocks; |
1da177e4 LT |
517 | unsigned short i_bytes; |
518 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ | |
1b1dcc1b | 519 | struct mutex i_mutex; |
1da177e4 LT |
520 | struct rw_semaphore i_alloc_sem; |
521 | struct inode_operations *i_op; | |
99ac48f5 | 522 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
1da177e4 LT |
523 | struct super_block *i_sb; |
524 | struct file_lock *i_flock; | |
525 | struct address_space *i_mapping; | |
526 | struct address_space i_data; | |
527 | #ifdef CONFIG_QUOTA | |
528 | struct dquot *i_dquot[MAXQUOTAS]; | |
529 | #endif | |
1da177e4 | 530 | struct list_head i_devices; |
4c154168 TT |
531 | union { |
532 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 533 | struct block_device *i_bdev; |
577c4eb0 | 534 | struct cdev *i_cdev; |
4c154168 | 535 | }; |
1da177e4 LT |
536 | int i_cindex; |
537 | ||
538 | __u32 i_generation; | |
539 | ||
540 | #ifdef CONFIG_DNOTIFY | |
541 | unsigned long i_dnotify_mask; /* Directory notify events */ | |
542 | struct dnotify_struct *i_dnotify; /* for directory notifications */ | |
543 | #endif | |
544 | ||
0eeca283 RL |
545 | #ifdef CONFIG_INOTIFY |
546 | struct list_head inotify_watches; /* watches on this inode */ | |
d4f9af9d | 547 | struct mutex inotify_mutex; /* protects the watches list */ |
0eeca283 RL |
548 | #endif |
549 | ||
1da177e4 LT |
550 | unsigned long i_state; |
551 | unsigned long dirtied_when; /* jiffies of first dirtying */ | |
552 | ||
553 | unsigned int i_flags; | |
554 | ||
555 | atomic_t i_writecount; | |
50462062 | 556 | #ifdef CONFIG_SECURITY |
1da177e4 | 557 | void *i_security; |
50462062 | 558 | #endif |
8e18e294 | 559 | void *i_private; /* fs or device private pointer */ |
1da177e4 LT |
560 | #ifdef __NEED_I_SIZE_ORDERED |
561 | seqcount_t i_size_seqcount; | |
562 | #endif | |
563 | }; | |
564 | ||
f2eace23 IM |
565 | /* |
566 | * inode->i_mutex nesting subclasses for the lock validator: | |
567 | * | |
568 | * 0: the object of the current VFS operation | |
569 | * 1: parent | |
570 | * 2: child/target | |
571 | * 3: quota file | |
572 | * | |
573 | * The locking order between these classes is | |
4df46240 | 574 | * parent -> child -> normal -> xattr -> quota |
f2eace23 IM |
575 | */ |
576 | enum inode_i_mutex_lock_class | |
577 | { | |
578 | I_MUTEX_NORMAL, | |
579 | I_MUTEX_PARENT, | |
580 | I_MUTEX_CHILD, | |
4df46240 | 581 | I_MUTEX_XATTR, |
f2eace23 IM |
582 | I_MUTEX_QUOTA |
583 | }; | |
584 | ||
1da177e4 LT |
585 | /* |
586 | * NOTE: in a 32bit arch with a preemptable kernel and | |
587 | * an UP compile the i_size_read/write must be atomic | |
588 | * with respect to the local cpu (unlike with preempt disabled), | |
589 | * but they don't need to be atomic with respect to other cpus like in | |
590 | * true SMP (so they need either to either locally disable irq around | |
591 | * the read or for example on x86 they can be still implemented as a | |
592 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
593 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
594 | */ | |
595 | static inline loff_t i_size_read(struct inode *inode) | |
596 | { | |
597 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
598 | loff_t i_size; | |
599 | unsigned int seq; | |
600 | ||
601 | do { | |
602 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
603 | i_size = inode->i_size; | |
604 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
605 | return i_size; | |
606 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
607 | loff_t i_size; | |
608 | ||
609 | preempt_disable(); | |
610 | i_size = inode->i_size; | |
611 | preempt_enable(); | |
612 | return i_size; | |
613 | #else | |
614 | return inode->i_size; | |
615 | #endif | |
616 | } | |
617 | ||
618 | ||
619 | static inline void i_size_write(struct inode *inode, loff_t i_size) | |
620 | { | |
621 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
622 | write_seqcount_begin(&inode->i_size_seqcount); | |
623 | inode->i_size = i_size; | |
624 | write_seqcount_end(&inode->i_size_seqcount); | |
625 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
626 | preempt_disable(); | |
627 | inode->i_size = i_size; | |
628 | preempt_enable(); | |
629 | #else | |
630 | inode->i_size = i_size; | |
631 | #endif | |
632 | } | |
633 | ||
634 | static inline unsigned iminor(struct inode *inode) | |
635 | { | |
636 | return MINOR(inode->i_rdev); | |
637 | } | |
638 | ||
639 | static inline unsigned imajor(struct inode *inode) | |
640 | { | |
641 | return MAJOR(inode->i_rdev); | |
642 | } | |
643 | ||
644 | extern struct block_device *I_BDEV(struct inode *inode); | |
645 | ||
646 | struct fown_struct { | |
647 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
648 | int pid; /* pid or -pgrp where SIGIO should be sent */ | |
649 | uid_t uid, euid; /* uid/euid of process setting the owner */ | |
1da177e4 LT |
650 | int signum; /* posix.1b rt signal to be delivered on IO */ |
651 | }; | |
652 | ||
653 | /* | |
654 | * Track a single file's readahead state | |
655 | */ | |
656 | struct file_ra_state { | |
657 | unsigned long start; /* Current window */ | |
658 | unsigned long size; | |
659 | unsigned long flags; /* ra flags RA_FLAG_xxx*/ | |
660 | unsigned long cache_hit; /* cache hit count*/ | |
661 | unsigned long prev_page; /* Cache last read() position */ | |
662 | unsigned long ahead_start; /* Ahead window */ | |
663 | unsigned long ahead_size; | |
664 | unsigned long ra_pages; /* Maximum readahead window */ | |
665 | unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ | |
666 | unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ | |
667 | }; | |
668 | #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ | |
669 | #define RA_FLAG_INCACHE 0x02 /* file is already in cache */ | |
670 | ||
671 | struct file { | |
2f512016 ED |
672 | /* |
673 | * fu_list becomes invalid after file_free is called and queued via | |
674 | * fu_rcuhead for RCU freeing | |
675 | */ | |
676 | union { | |
677 | struct list_head fu_list; | |
678 | struct rcu_head fu_rcuhead; | |
679 | } f_u; | |
1da177e4 LT |
680 | struct dentry *f_dentry; |
681 | struct vfsmount *f_vfsmnt; | |
99ac48f5 | 682 | const struct file_operations *f_op; |
1da177e4 LT |
683 | atomic_t f_count; |
684 | unsigned int f_flags; | |
685 | mode_t f_mode; | |
1da177e4 LT |
686 | loff_t f_pos; |
687 | struct fown_struct f_owner; | |
688 | unsigned int f_uid, f_gid; | |
689 | struct file_ra_state f_ra; | |
690 | ||
1da177e4 | 691 | unsigned long f_version; |
50462062 | 692 | #ifdef CONFIG_SECURITY |
1da177e4 | 693 | void *f_security; |
50462062 | 694 | #endif |
1da177e4 LT |
695 | /* needed for tty driver, and maybe others */ |
696 | void *private_data; | |
697 | ||
698 | #ifdef CONFIG_EPOLL | |
699 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
700 | struct list_head f_ep_links; | |
701 | spinlock_t f_ep_lock; | |
702 | #endif /* #ifdef CONFIG_EPOLL */ | |
703 | struct address_space *f_mapping; | |
704 | }; | |
705 | extern spinlock_t files_lock; | |
706 | #define file_list_lock() spin_lock(&files_lock); | |
707 | #define file_list_unlock() spin_unlock(&files_lock); | |
708 | ||
095975da | 709 | #define get_file(x) atomic_inc(&(x)->f_count) |
1da177e4 LT |
710 | #define file_count(x) atomic_read(&(x)->f_count) |
711 | ||
712 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
713 | ||
714 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
715 | limits, otherwise bad things can happen in VM. */ | |
716 | #if BITS_PER_LONG==32 | |
717 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) | |
718 | #elif BITS_PER_LONG==64 | |
719 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL | |
720 | #endif | |
721 | ||
722 | #define FL_POSIX 1 | |
723 | #define FL_FLOCK 2 | |
724 | #define FL_ACCESS 8 /* not trying to lock, just looking */ | |
f475ae95 | 725 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 726 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 727 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 LT |
728 | #define FL_SLEEP 128 /* A blocking lock */ |
729 | ||
730 | /* | |
731 | * The POSIX file lock owner is determined by | |
732 | * the "struct files_struct" in the thread group | |
733 | * (or NULL for no owner - BSD locks). | |
734 | * | |
735 | * Lockd stuffs a "host" pointer into this. | |
736 | */ | |
737 | typedef struct files_struct *fl_owner_t; | |
738 | ||
739 | struct file_lock_operations { | |
740 | void (*fl_insert)(struct file_lock *); /* lock insertion callback */ | |
741 | void (*fl_remove)(struct file_lock *); /* lock removal callback */ | |
742 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
743 | void (*fl_release_private)(struct file_lock *); | |
744 | }; | |
745 | ||
746 | struct lock_manager_operations { | |
747 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); | |
748 | void (*fl_notify)(struct file_lock *); /* unblock callback */ | |
749 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
750 | void (*fl_release_private)(struct file_lock *); | |
751 | void (*fl_break)(struct file_lock *); | |
752 | int (*fl_mylease)(struct file_lock *, struct file_lock *); | |
753 | int (*fl_change)(struct file_lock **, int); | |
754 | }; | |
755 | ||
756 | /* that will die - we need it for nfs_lock_info */ | |
757 | #include <linux/nfs_fs_i.h> | |
758 | ||
759 | struct file_lock { | |
760 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
761 | struct list_head fl_link; /* doubly linked list of all locks */ | |
762 | struct list_head fl_block; /* circular list of blocked processes */ | |
763 | fl_owner_t fl_owner; | |
764 | unsigned int fl_pid; | |
765 | wait_queue_head_t fl_wait; | |
766 | struct file *fl_file; | |
767 | unsigned char fl_flags; | |
768 | unsigned char fl_type; | |
769 | loff_t fl_start; | |
770 | loff_t fl_end; | |
771 | ||
772 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
773 | unsigned long fl_break_time; /* for nonblocking lease breaks */ | |
774 | ||
775 | struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ | |
776 | struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ | |
777 | union { | |
778 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 779 | struct nfs4_lock_info nfs4_fl; |
1da177e4 LT |
780 | } fl_u; |
781 | }; | |
782 | ||
783 | /* The following constant reflects the upper bound of the file/locking space */ | |
784 | #ifndef OFFSET_MAX | |
785 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
786 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
787 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
788 | #endif | |
789 | ||
1da177e4 LT |
790 | #include <linux/fcntl.h> |
791 | ||
792 | extern int fcntl_getlk(struct file *, struct flock __user *); | |
c293621b PS |
793 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
794 | struct flock __user *); | |
1da177e4 LT |
795 | |
796 | #if BITS_PER_LONG == 32 | |
797 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); | |
c293621b PS |
798 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
799 | struct flock64 __user *); | |
1da177e4 LT |
800 | #endif |
801 | ||
802 | extern void send_sigio(struct fown_struct *fown, int fd, int band); | |
803 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); | |
804 | extern int fcntl_getlease(struct file *filp); | |
805 | ||
f79e2abb | 806 | /* fs/sync.c */ |
f79e2abb | 807 | extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte, |
5246d050 | 808 | unsigned int flags); |
f79e2abb | 809 | |
1da177e4 LT |
810 | /* fs/locks.c */ |
811 | extern void locks_init_lock(struct file_lock *); | |
812 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); | |
813 | extern void locks_remove_posix(struct file *, fl_owner_t); | |
814 | extern void locks_remove_flock(struct file *); | |
8dc7c311 | 815 | extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *); |
5842add2 | 816 | extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *); |
1da177e4 LT |
817 | extern int posix_lock_file(struct file *, struct file_lock *); |
818 | extern int posix_lock_file_wait(struct file *, struct file_lock *); | |
64a318ee | 819 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
1da177e4 LT |
820 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
821 | extern int __break_lease(struct inode *inode, unsigned int flags); | |
822 | extern void lease_get_mtime(struct inode *, struct timespec *time); | |
823 | extern int setlease(struct file *, long, struct file_lock **); | |
824 | extern int lease_modify(struct file_lock **, int); | |
825 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); | |
826 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); | |
1da177e4 LT |
827 | |
828 | struct fasync_struct { | |
829 | int magic; | |
830 | int fa_fd; | |
831 | struct fasync_struct *fa_next; /* singly linked list */ | |
832 | struct file *fa_file; | |
833 | }; | |
834 | ||
835 | #define FASYNC_MAGIC 0x4601 | |
836 | ||
837 | /* SMP safe fasync helpers: */ | |
838 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
839 | /* can be called from interrupts */ | |
840 | extern void kill_fasync(struct fasync_struct **, int, int); | |
841 | /* only for net: no internal synchronization */ | |
842 | extern void __kill_fasync(struct fasync_struct *, int, int); | |
843 | ||
844 | extern int f_setown(struct file *filp, unsigned long arg, int force); | |
845 | extern void f_delown(struct file *filp); | |
846 | extern int send_sigurg(struct fown_struct *fown); | |
847 | ||
848 | /* | |
849 | * Umount options | |
850 | */ | |
851 | ||
852 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
853 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
854 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
855 | ||
856 | extern struct list_head super_blocks; | |
857 | extern spinlock_t sb_lock; | |
858 | ||
859 | #define sb_entry(list) list_entry((list), struct super_block, s_list) | |
860 | #define S_BIAS (1<<30) | |
861 | struct super_block { | |
862 | struct list_head s_list; /* Keep this first */ | |
863 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
864 | unsigned long s_blocksize; | |
1da177e4 LT |
865 | unsigned char s_blocksize_bits; |
866 | unsigned char s_dirt; | |
867 | unsigned long long s_maxbytes; /* Max file size */ | |
868 | struct file_system_type *s_type; | |
869 | struct super_operations *s_op; | |
870 | struct dquot_operations *dq_op; | |
871 | struct quotactl_ops *s_qcop; | |
872 | struct export_operations *s_export_op; | |
873 | unsigned long s_flags; | |
874 | unsigned long s_magic; | |
875 | struct dentry *s_root; | |
876 | struct rw_semaphore s_umount; | |
7892f2f4 | 877 | struct mutex s_lock; |
1da177e4 LT |
878 | int s_count; |
879 | int s_syncing; | |
880 | int s_need_sync_fs; | |
881 | atomic_t s_active; | |
50462062 | 882 | #ifdef CONFIG_SECURITY |
1da177e4 | 883 | void *s_security; |
50462062 | 884 | #endif |
1da177e4 LT |
885 | struct xattr_handler **s_xattr; |
886 | ||
887 | struct list_head s_inodes; /* all inodes */ | |
888 | struct list_head s_dirty; /* dirty inodes */ | |
889 | struct list_head s_io; /* parked for writeback */ | |
890 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ | |
891 | struct list_head s_files; | |
892 | ||
893 | struct block_device *s_bdev; | |
894 | struct list_head s_instances; | |
895 | struct quota_info s_dquot; /* Diskquota specific options */ | |
896 | ||
897 | int s_frozen; | |
898 | wait_queue_head_t s_wait_unfrozen; | |
899 | ||
900 | char s_id[32]; /* Informational name */ | |
901 | ||
902 | void *s_fs_info; /* Filesystem private info */ | |
903 | ||
904 | /* | |
905 | * The next field is for VFS *only*. No filesystems have any business | |
906 | * even looking at it. You had been warned. | |
907 | */ | |
a11f3a05 | 908 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 909 | |
8ba8e95e | 910 | /* Granularity of c/m/atime in ns. |
1da177e4 LT |
911 | Cannot be worse than a second */ |
912 | u32 s_time_gran; | |
913 | }; | |
914 | ||
915 | extern struct timespec current_fs_time(struct super_block *sb); | |
916 | ||
917 | /* | |
918 | * Snapshotting support. | |
919 | */ | |
920 | enum { | |
921 | SB_UNFROZEN = 0, | |
922 | SB_FREEZE_WRITE = 1, | |
923 | SB_FREEZE_TRANS = 2, | |
924 | }; | |
925 | ||
926 | #define vfs_check_frozen(sb, level) \ | |
927 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) | |
928 | ||
22e2c507 JA |
929 | static inline void get_fs_excl(void) |
930 | { | |
931 | atomic_inc(¤t->fs_excl); | |
932 | } | |
933 | ||
934 | static inline void put_fs_excl(void) | |
935 | { | |
936 | atomic_dec(¤t->fs_excl); | |
937 | } | |
938 | ||
939 | static inline int has_fs_excl(void) | |
940 | { | |
941 | return atomic_read(¤t->fs_excl); | |
942 | } | |
943 | ||
944 | ||
1da177e4 LT |
945 | /* |
946 | * Superblock locking. | |
947 | */ | |
948 | static inline void lock_super(struct super_block * sb) | |
949 | { | |
22e2c507 | 950 | get_fs_excl(); |
7892f2f4 | 951 | mutex_lock(&sb->s_lock); |
1da177e4 LT |
952 | } |
953 | ||
954 | static inline void unlock_super(struct super_block * sb) | |
955 | { | |
22e2c507 | 956 | put_fs_excl(); |
7892f2f4 | 957 | mutex_unlock(&sb->s_lock); |
1da177e4 LT |
958 | } |
959 | ||
960 | /* | |
961 | * VFS helper functions.. | |
962 | */ | |
e4543edd | 963 | extern int vfs_permission(struct nameidata *, int); |
1da177e4 LT |
964 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
965 | extern int vfs_mkdir(struct inode *, struct dentry *, int); | |
966 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
967 | extern int vfs_symlink(struct inode *, struct dentry *, const char *, int); | |
968 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); | |
969 | extern int vfs_rmdir(struct inode *, struct dentry *); | |
970 | extern int vfs_unlink(struct inode *, struct dentry *); | |
971 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
972 | ||
973 | /* | |
974 | * VFS dentry helper functions. | |
975 | */ | |
976 | extern void dentry_unhash(struct dentry *dentry); | |
977 | ||
8c744fb8 CH |
978 | /* |
979 | * VFS file helper functions. | |
980 | */ | |
981 | extern int file_permission(struct file *, int); | |
982 | ||
1da177e4 LT |
983 | /* |
984 | * File types | |
985 | * | |
986 | * NOTE! These match bits 12..15 of stat.st_mode | |
987 | * (ie "(i_mode >> 12) & 15"). | |
988 | */ | |
989 | #define DT_UNKNOWN 0 | |
990 | #define DT_FIFO 1 | |
991 | #define DT_CHR 2 | |
992 | #define DT_DIR 4 | |
993 | #define DT_BLK 6 | |
994 | #define DT_REG 8 | |
995 | #define DT_LNK 10 | |
996 | #define DT_SOCK 12 | |
997 | #define DT_WHT 14 | |
998 | ||
999 | #define OSYNC_METADATA (1<<0) | |
1000 | #define OSYNC_DATA (1<<1) | |
1001 | #define OSYNC_INODE (1<<2) | |
1002 | int generic_osync_inode(struct inode *, struct address_space *, int); | |
1003 | ||
1004 | /* | |
1005 | * This is the "filldir" function type, used by readdir() to let | |
1006 | * the kernel specify what kind of dirent layout it wants to have. | |
1007 | * This allows the kernel to read directories into kernel space or | |
1008 | * to have different dirent layouts depending on the binary type. | |
1009 | */ | |
1010 | typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned); | |
1011 | ||
1012 | struct block_device_operations { | |
1013 | int (*open) (struct inode *, struct file *); | |
1014 | int (*release) (struct inode *, struct file *); | |
1015 | int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); | |
bb93e3a5 | 1016 | long (*unlocked_ioctl) (struct file *, unsigned, unsigned long); |
1da177e4 | 1017 | long (*compat_ioctl) (struct file *, unsigned, unsigned long); |
420edbcc | 1018 | int (*direct_access) (struct block_device *, sector_t, unsigned long *); |
1da177e4 LT |
1019 | int (*media_changed) (struct gendisk *); |
1020 | int (*revalidate_disk) (struct gendisk *); | |
a885c8c4 | 1021 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
1da177e4 LT |
1022 | struct module *owner; |
1023 | }; | |
1024 | ||
1025 | /* | |
1026 | * "descriptor" for what we're up to with a read for sendfile(). | |
1027 | * This allows us to use the same read code yet | |
1028 | * have multiple different users of the data that | |
1029 | * we read from a file. | |
1030 | * | |
1031 | * The simplest case just copies the data to user | |
1032 | * mode. | |
1033 | */ | |
1034 | typedef struct { | |
1035 | size_t written; | |
1036 | size_t count; | |
1037 | union { | |
1038 | char __user * buf; | |
1039 | void *data; | |
1040 | } arg; | |
1041 | int error; | |
1042 | } read_descriptor_t; | |
1043 | ||
1044 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); | |
1045 | ||
1046 | /* These macros are for out of kernel modules to test that | |
1047 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1048 | * fields in struct file_operations. */ | |
1049 | #define HAVE_COMPAT_IOCTL 1 | |
1050 | #define HAVE_UNLOCKED_IOCTL 1 | |
1051 | ||
1052 | /* | |
1053 | * NOTE: | |
1054 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl | |
1055 | * can be called without the big kernel lock held in all filesystems. | |
1056 | */ | |
1057 | struct file_operations { | |
1058 | struct module *owner; | |
1059 | loff_t (*llseek) (struct file *, loff_t, int); | |
1060 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1061 | ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); | |
1062 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); | |
1063 | ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); | |
1064 | int (*readdir) (struct file *, void *, filldir_t); | |
1065 | unsigned int (*poll) (struct file *, struct poll_table_struct *); | |
1066 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); | |
1067 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); | |
1068 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1069 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1070 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1071 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 LT |
1072 | int (*release) (struct inode *, struct file *); |
1073 | int (*fsync) (struct file *, struct dentry *, int datasync); | |
1074 | int (*aio_fsync) (struct kiocb *, int datasync); | |
1075 | int (*fasync) (int, struct file *, int); | |
1076 | int (*lock) (struct file *, int, struct file_lock *); | |
1077 | ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); | |
1078 | ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); | |
1079 | ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); | |
1080 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); | |
1081 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1082 | int (*check_flags)(int); | |
1083 | int (*dir_notify)(struct file *filp, unsigned long arg); | |
1084 | int (*flock) (struct file *, int, struct file_lock *); | |
cbb7e577 JA |
1085 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1086 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
1da177e4 LT |
1087 | }; |
1088 | ||
1089 | struct inode_operations { | |
1090 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); | |
1091 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); | |
1092 | int (*link) (struct dentry *,struct inode *,struct dentry *); | |
1093 | int (*unlink) (struct inode *,struct dentry *); | |
1094 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
1095 | int (*mkdir) (struct inode *,struct dentry *,int); | |
1096 | int (*rmdir) (struct inode *,struct dentry *); | |
1097 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); | |
1098 | int (*rename) (struct inode *, struct dentry *, | |
1099 | struct inode *, struct dentry *); | |
1100 | int (*readlink) (struct dentry *, char __user *,int); | |
cc314eef LT |
1101 | void * (*follow_link) (struct dentry *, struct nameidata *); |
1102 | void (*put_link) (struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
1103 | void (*truncate) (struct inode *); |
1104 | int (*permission) (struct inode *, int, struct nameidata *); | |
1105 | int (*setattr) (struct dentry *, struct iattr *); | |
1106 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1107 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); | |
1108 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); | |
1109 | ssize_t (*listxattr) (struct dentry *, char *, size_t); | |
1110 | int (*removexattr) (struct dentry *, const char *); | |
f6b3ec23 | 1111 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
1da177e4 LT |
1112 | }; |
1113 | ||
1114 | struct seq_file; | |
1115 | ||
1116 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); | |
1117 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1118 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
1119 | unsigned long, loff_t *); | |
1120 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, | |
1121 | unsigned long, loff_t *); | |
1122 | ||
1123 | /* | |
1124 | * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called | |
1125 | * without the big kernel lock held in all filesystems. | |
1126 | */ | |
1127 | struct super_operations { | |
1128 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1129 | void (*destroy_inode)(struct inode *); | |
1130 | ||
1131 | void (*read_inode) (struct inode *); | |
1132 | ||
1133 | void (*dirty_inode) (struct inode *); | |
1134 | int (*write_inode) (struct inode *, int); | |
1135 | void (*put_inode) (struct inode *); | |
1136 | void (*drop_inode) (struct inode *); | |
1137 | void (*delete_inode) (struct inode *); | |
1138 | void (*put_super) (struct super_block *); | |
1139 | void (*write_super) (struct super_block *); | |
1140 | int (*sync_fs)(struct super_block *sb, int wait); | |
1141 | void (*write_super_lockfs) (struct super_block *); | |
1142 | void (*unlockfs) (struct super_block *); | |
726c3342 | 1143 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 LT |
1144 | int (*remount_fs) (struct super_block *, int *, char *); |
1145 | void (*clear_inode) (struct inode *); | |
8b512d9a | 1146 | void (*umount_begin) (struct vfsmount *, int); |
1da177e4 LT |
1147 | |
1148 | int (*show_options)(struct seq_file *, struct vfsmount *); | |
b4629fe2 | 1149 | int (*show_stats)(struct seq_file *, struct vfsmount *); |
0e51a720 | 1150 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1151 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1152 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
0e51a720 | 1153 | #endif |
1da177e4 LT |
1154 | }; |
1155 | ||
1156 | /* Inode state bits. Protected by inode_lock. */ | |
1157 | #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */ | |
1158 | #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */ | |
1159 | #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */ | |
1160 | #define __I_LOCK 3 | |
1161 | #define I_LOCK (1 << __I_LOCK) | |
1162 | #define I_FREEING 16 | |
1163 | #define I_CLEAR 32 | |
1164 | #define I_NEW 64 | |
991114c6 | 1165 | #define I_WILL_FREE 128 |
1da177e4 LT |
1166 | |
1167 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
1168 | ||
1169 | extern void __mark_inode_dirty(struct inode *, int); | |
1170 | static inline void mark_inode_dirty(struct inode *inode) | |
1171 | { | |
1172 | __mark_inode_dirty(inode, I_DIRTY); | |
1173 | } | |
1174 | ||
1175 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1176 | { | |
1177 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1178 | } | |
1179 | ||
66d21730 AD |
1180 | static inline void inode_inc_link_count(struct inode *inode) |
1181 | { | |
1182 | inode->i_nlink++; | |
1183 | mark_inode_dirty(inode); | |
1184 | } | |
1185 | ||
1186 | static inline void inode_dec_link_count(struct inode *inode) | |
1187 | { | |
1188 | inode->i_nlink--; | |
1189 | mark_inode_dirty(inode); | |
1190 | } | |
1191 | ||
869243a0 | 1192 | extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
1da177e4 LT |
1193 | static inline void file_accessed(struct file *file) |
1194 | { | |
1195 | if (!(file->f_flags & O_NOATIME)) | |
1196 | touch_atime(file->f_vfsmnt, file->f_dentry); | |
1197 | } | |
1198 | ||
1199 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
1200 | ||
1201 | /** | |
4dc3b16b PP |
1202 | * struct export_operations - for nfsd to communicate with file systems |
1203 | * @decode_fh: decode a file handle fragment and return a &struct dentry | |
1204 | * @encode_fh: encode a file handle fragment from a dentry | |
1205 | * @get_name: find the name for a given inode in a given directory | |
1206 | * @get_parent: find the parent of a given directory | |
1207 | * @get_dentry: find a dentry for the inode given a file handle sub-fragment | |
8f2709b5 RD |
1208 | * @find_exported_dentry: |
1209 | * set by the exporting module to a standard helper function. | |
1da177e4 LT |
1210 | * |
1211 | * Description: | |
1212 | * The export_operations structure provides a means for nfsd to communicate | |
1213 | * with a particular exported file system - particularly enabling nfsd and | |
1214 | * the filesystem to co-operate when dealing with file handles. | |
1215 | * | |
67be2dd1 MW |
1216 | * export_operations contains two basic operation for dealing with file |
1217 | * handles, decode_fh() and encode_fh(), and allows for some other | |
1218 | * operations to be defined which standard helper routines use to get | |
1219 | * specific information from the filesystem. | |
1da177e4 LT |
1220 | * |
1221 | * nfsd encodes information use to determine which filesystem a filehandle | |
67be2dd1 MW |
1222 | * applies to in the initial part of the file handle. The remainder, termed |
1223 | * a file handle fragment, is controlled completely by the filesystem. The | |
1224 | * standard helper routines assume that this fragment will contain one or | |
1225 | * two sub-fragments, one which identifies the file, and one which may be | |
1226 | * used to identify the (a) directory containing the file. | |
1da177e4 LT |
1227 | * |
1228 | * In some situations, nfsd needs to get a dentry which is connected into a | |
67be2dd1 MW |
1229 | * specific part of the file tree. To allow for this, it passes the |
1230 | * function acceptable() together with a @context which can be used to see | |
1231 | * if the dentry is acceptable. As there can be multiple dentrys for a | |
1232 | * given file, the filesystem should check each one for acceptability before | |
1233 | * looking for the next. As soon as an acceptable one is found, it should | |
1234 | * be returned. | |
1da177e4 LT |
1235 | * |
1236 | * decode_fh: | |
67be2dd1 MW |
1237 | * @decode_fh is given a &struct super_block (@sb), a file handle fragment |
1238 | * (@fh, @fh_len) and an acceptability testing function (@acceptable, | |
1239 | * @context). It should return a &struct dentry which refers to the same | |
1240 | * file that the file handle fragment refers to, and which passes the | |
1241 | * acceptability test. If it cannot, it should return a %NULL pointer if | |
1242 | * the file was found but no acceptable &dentries were available, or a | |
1243 | * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or | |
1244 | * %ENOMEM). | |
1da177e4 LT |
1245 | * |
1246 | * encode_fh: | |
67be2dd1 MW |
1247 | * @encode_fh should store in the file handle fragment @fh (using at most |
1248 | * @max_len bytes) information that can be used by @decode_fh to recover the | |
1249 | * file refered to by the &struct dentry @de. If the @connectable flag is | |
1250 | * set, the encode_fh() should store sufficient information so that a good | |
1251 | * attempt can be made to find not only the file but also it's place in the | |
1252 | * filesystem. This typically means storing a reference to de->d_parent in | |
1253 | * the filehandle fragment. encode_fh() should return the number of bytes | |
1254 | * stored or a negative error code such as %-ENOSPC | |
1da177e4 LT |
1255 | * |
1256 | * get_name: | |
67be2dd1 MW |
1257 | * @get_name should find a name for the given @child in the given @parent |
1258 | * directory. The name should be stored in the @name (with the | |
1259 | * understanding that it is already pointing to a a %NAME_MAX+1 sized | |
1260 | * buffer. get_name() should return %0 on success, a negative error code | |
1b1dcc1b | 1261 | * or error. @get_name will be called without @parent->i_mutex held. |
1da177e4 LT |
1262 | * |
1263 | * get_parent: | |
67be2dd1 MW |
1264 | * @get_parent should find the parent directory for the given @child which |
1265 | * is also a directory. In the event that it cannot be found, or storage | |
1266 | * space cannot be allocated, a %ERR_PTR should be returned. | |
1da177e4 LT |
1267 | * |
1268 | * get_dentry: | |
67be2dd1 MW |
1269 | * Given a &super_block (@sb) and a pointer to a file-system specific inode |
1270 | * identifier, possibly an inode number, (@inump) get_dentry() should find | |
1271 | * the identified inode and return a dentry for that inode. Any suitable | |
1272 | * dentry can be returned including, if necessary, a new dentry created with | |
1273 | * d_alloc_root. The caller can then find any other extant dentrys by | |
1274 | * following the d_alias links. If a new dentry was created using | |
1275 | * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry | |
1276 | * should be d_rehash()ed. | |
1da177e4 | 1277 | * |
67be2dd1 MW |
1278 | * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code |
1279 | * can be returned. The @inump will be whatever was passed to | |
1280 | * nfsd_find_fh_dentry() in either the @obj or @parent parameters. | |
1da177e4 LT |
1281 | * |
1282 | * Locking rules: | |
1b1dcc1b | 1283 | * get_parent is called with child->d_inode->i_mutex down |
67be2dd1 | 1284 | * get_name is not (which is possibly inconsistent) |
1da177e4 LT |
1285 | */ |
1286 | ||
1287 | struct export_operations { | |
1288 | struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, | |
1289 | int (*acceptable)(void *context, struct dentry *de), | |
1290 | void *context); | |
1291 | int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, | |
1292 | int connectable); | |
1293 | ||
1294 | /* the following are only called from the filesystem itself */ | |
1295 | int (*get_name)(struct dentry *parent, char *name, | |
1296 | struct dentry *child); | |
1297 | struct dentry * (*get_parent)(struct dentry *child); | |
1298 | struct dentry * (*get_dentry)(struct super_block *sb, void *inump); | |
1299 | ||
1300 | /* This is set by the exporting module to a standard helper */ | |
1301 | struct dentry * (*find_exported_dentry)( | |
1302 | struct super_block *sb, void *obj, void *parent, | |
1303 | int (*acceptable)(void *context, struct dentry *de), | |
1304 | void *context); | |
1305 | ||
1306 | ||
1307 | }; | |
1308 | ||
1309 | extern struct dentry * | |
1310 | find_exported_dentry(struct super_block *sb, void *obj, void *parent, | |
1311 | int (*acceptable)(void *context, struct dentry *de), | |
1312 | void *context); | |
1313 | ||
1314 | struct file_system_type { | |
1315 | const char *name; | |
1316 | int fs_flags; | |
454e2398 DH |
1317 | int (*get_sb) (struct file_system_type *, int, |
1318 | const char *, void *, struct vfsmount *); | |
1da177e4 LT |
1319 | void (*kill_sb) (struct super_block *); |
1320 | struct module *owner; | |
1321 | struct file_system_type * next; | |
1322 | struct list_head fs_supers; | |
cf516249 | 1323 | struct lock_class_key s_lock_key; |
897c6ff9 | 1324 | struct lock_class_key s_umount_key; |
1da177e4 LT |
1325 | }; |
1326 | ||
454e2398 | 1327 | extern int get_sb_bdev(struct file_system_type *fs_type, |
1da177e4 | 1328 | int flags, const char *dev_name, void *data, |
454e2398 DH |
1329 | int (*fill_super)(struct super_block *, void *, int), |
1330 | struct vfsmount *mnt); | |
1331 | extern int get_sb_single(struct file_system_type *fs_type, | |
1da177e4 | 1332 | int flags, void *data, |
454e2398 DH |
1333 | int (*fill_super)(struct super_block *, void *, int), |
1334 | struct vfsmount *mnt); | |
1335 | extern int get_sb_nodev(struct file_system_type *fs_type, | |
1da177e4 | 1336 | int flags, void *data, |
454e2398 DH |
1337 | int (*fill_super)(struct super_block *, void *, int), |
1338 | struct vfsmount *mnt); | |
1da177e4 LT |
1339 | void generic_shutdown_super(struct super_block *sb); |
1340 | void kill_block_super(struct super_block *sb); | |
1341 | void kill_anon_super(struct super_block *sb); | |
1342 | void kill_litter_super(struct super_block *sb); | |
1343 | void deactivate_super(struct super_block *sb); | |
1344 | int set_anon_super(struct super_block *s, void *data); | |
1345 | struct super_block *sget(struct file_system_type *type, | |
1346 | int (*test)(struct super_block *,void *), | |
1347 | int (*set)(struct super_block *,void *), | |
1348 | void *data); | |
454e2398 DH |
1349 | extern int get_sb_pseudo(struct file_system_type *, char *, |
1350 | struct super_operations *ops, unsigned long, | |
1351 | struct vfsmount *mnt); | |
1352 | extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); | |
1da177e4 LT |
1353 | int __put_super(struct super_block *sb); |
1354 | int __put_super_and_need_restart(struct super_block *sb); | |
1355 | void unnamed_dev_init(void); | |
1356 | ||
1357 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
1358 | #define fops_get(fops) \ | |
1359 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
1360 | #define fops_put(fops) \ | |
1361 | do { if (fops) module_put((fops)->owner); } while(0) | |
1362 | ||
1363 | extern int register_filesystem(struct file_system_type *); | |
1364 | extern int unregister_filesystem(struct file_system_type *); | |
1365 | extern struct vfsmount *kern_mount(struct file_system_type *); | |
1366 | extern int may_umount_tree(struct vfsmount *); | |
1367 | extern int may_umount(struct vfsmount *); | |
a05964f3 | 1368 | extern void umount_tree(struct vfsmount *, int, struct list_head *); |
b90fa9ae | 1369 | extern void release_mounts(struct list_head *); |
1da177e4 | 1370 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
b90fa9ae RP |
1371 | extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int); |
1372 | extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *, | |
1373 | struct vfsmount *); | |
1da177e4 | 1374 | |
726c3342 | 1375 | extern int vfs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 | 1376 | |
f87fd4c2 MS |
1377 | /* /sys/fs */ |
1378 | extern struct subsystem fs_subsys; | |
1379 | ||
1da177e4 LT |
1380 | #define FLOCK_VERIFY_READ 1 |
1381 | #define FLOCK_VERIFY_WRITE 2 | |
1382 | ||
1383 | extern int locks_mandatory_locked(struct inode *); | |
1384 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); | |
1385 | ||
1386 | /* | |
1387 | * Candidates for mandatory locking have the setgid bit set | |
1388 | * but no group execute bit - an otherwise meaningless combination. | |
1389 | */ | |
1390 | #define MANDATORY_LOCK(inode) \ | |
1391 | (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
1392 | ||
1393 | static inline int locks_verify_locked(struct inode *inode) | |
1394 | { | |
1395 | if (MANDATORY_LOCK(inode)) | |
1396 | return locks_mandatory_locked(inode); | |
1397 | return 0; | |
1398 | } | |
1399 | ||
1400 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); | |
1401 | ||
1402 | static inline int locks_verify_truncate(struct inode *inode, | |
1403 | struct file *filp, | |
1404 | loff_t size) | |
1405 | { | |
1406 | if (inode->i_flock && MANDATORY_LOCK(inode)) | |
1407 | return locks_mandatory_area( | |
1408 | FLOCK_VERIFY_WRITE, inode, filp, | |
1409 | size < inode->i_size ? size : inode->i_size, | |
1410 | (size < inode->i_size ? inode->i_size - size | |
1411 | : size - inode->i_size) | |
1412 | ); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
1417 | { | |
1418 | if (inode->i_flock) | |
1419 | return __break_lease(inode, mode); | |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | /* fs/open.c */ | |
1424 | ||
4a30131e N |
1425 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
1426 | struct file *filp); | |
5590ff0d UD |
1427 | extern long do_sys_open(int fdf, const char __user *filename, int flags, |
1428 | int mode); | |
1da177e4 LT |
1429 | extern struct file *filp_open(const char *, int, int); |
1430 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int); | |
1431 | extern int filp_close(struct file *, fl_owner_t id); | |
1432 | extern char * getname(const char __user *); | |
1433 | ||
1434 | /* fs/dcache.c */ | |
1435 | extern void __init vfs_caches_init_early(void); | |
1436 | extern void __init vfs_caches_init(unsigned long); | |
1437 | ||
1438 | #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL) | |
1439 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) | |
1440 | #ifndef CONFIG_AUDITSYSCALL | |
1441 | #define putname(name) __putname(name) | |
1442 | #else | |
1443 | extern void putname(const char *name); | |
1444 | #endif | |
1445 | ||
1446 | extern int register_blkdev(unsigned int, const char *); | |
1447 | extern int unregister_blkdev(unsigned int, const char *); | |
1448 | extern struct block_device *bdget(dev_t); | |
1449 | extern void bd_set_size(struct block_device *, loff_t size); | |
1450 | extern void bd_forget(struct inode *inode); | |
1451 | extern void bdput(struct block_device *); | |
1452 | extern struct block_device *open_by_devnum(dev_t, unsigned); | |
663d440e | 1453 | extern struct block_device *open_partition_by_devnum(dev_t, unsigned); |
4b6f5d20 | 1454 | extern const struct file_operations def_blk_fops; |
f5e54d6e | 1455 | extern const struct address_space_operations def_blk_aops; |
4b6f5d20 AV |
1456 | extern const struct file_operations def_chr_fops; |
1457 | extern const struct file_operations bad_sock_fops; | |
1458 | extern const struct file_operations def_fifo_fops; | |
1da177e4 LT |
1459 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
1460 | extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); | |
1461 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); | |
1462 | extern int blkdev_get(struct block_device *, mode_t, unsigned); | |
1463 | extern int blkdev_put(struct block_device *); | |
663d440e | 1464 | extern int blkdev_put_partition(struct block_device *); |
1da177e4 LT |
1465 | extern int bd_claim(struct block_device *, void *); |
1466 | extern void bd_release(struct block_device *); | |
641dc636 JN |
1467 | #ifdef CONFIG_SYSFS |
1468 | extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); | |
1469 | extern void bd_release_from_disk(struct block_device *, struct gendisk *); | |
1470 | #else | |
1471 | #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) | |
1472 | #define bd_release_from_disk(bdev, disk) bd_release(bdev) | |
1473 | #endif | |
1da177e4 LT |
1474 | |
1475 | /* fs/char_dev.c */ | |
68eef3b4 | 1476 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
1477 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
1478 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1479 | extern int register_chrdev(unsigned int, const char *, | |
99ac48f5 | 1480 | const struct file_operations *); |
1da177e4 LT |
1481 | extern int unregister_chrdev(unsigned int, const char *); |
1482 | extern void unregister_chrdev_region(dev_t, unsigned); | |
1483 | extern int chrdev_open(struct inode *, struct file *); | |
68eef3b4 | 1484 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 LT |
1485 | |
1486 | /* fs/block_dev.c */ | |
68eef3b4 | 1487 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
1488 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
1489 | extern const char *__bdevname(dev_t, char *buffer); | |
1490 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
1491 | extern struct block_device *lookup_bdev(const char *); | |
1492 | extern struct block_device *open_bdev_excl(const char *, int, void *); | |
1493 | extern void close_bdev_excl(struct block_device *); | |
68eef3b4 | 1494 | extern void blkdev_show(struct seq_file *,off_t); |
1da177e4 LT |
1495 | |
1496 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
1497 | ||
1498 | /* Invalid inode operations -- fs/bad_inode.c */ | |
1499 | extern void make_bad_inode(struct inode *); | |
1500 | extern int is_bad_inode(struct inode *); | |
1501 | ||
4b6f5d20 AV |
1502 | extern const struct file_operations read_fifo_fops; |
1503 | extern const struct file_operations write_fifo_fops; | |
1504 | extern const struct file_operations rdwr_fifo_fops; | |
1da177e4 LT |
1505 | |
1506 | extern int fs_may_remount_ro(struct super_block *); | |
1507 | ||
1508 | /* | |
1509 | * return READ, READA, or WRITE | |
1510 | */ | |
1511 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) | |
1512 | ||
1513 | /* | |
1514 | * return data direction, READ or WRITE | |
1515 | */ | |
1516 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) | |
1517 | ||
1518 | extern int check_disk_change(struct block_device *); | |
1519 | extern int invalidate_inodes(struct super_block *); | |
2ef41634 | 1520 | extern int __invalidate_device(struct block_device *); |
1da177e4 LT |
1521 | extern int invalidate_partition(struct gendisk *, int); |
1522 | unsigned long invalidate_mapping_pages(struct address_space *mapping, | |
1523 | pgoff_t start, pgoff_t end); | |
1524 | unsigned long invalidate_inode_pages(struct address_space *mapping); | |
1525 | static inline void invalidate_remote_inode(struct inode *inode) | |
1526 | { | |
1527 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
1528 | S_ISLNK(inode->i_mode)) | |
1529 | invalidate_inode_pages(inode->i_mapping); | |
1530 | } | |
1531 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
1532 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
1533 | pgoff_t start, pgoff_t end); | |
1534 | extern int write_inode_now(struct inode *, int); | |
1535 | extern int filemap_fdatawrite(struct address_space *); | |
1536 | extern int filemap_flush(struct address_space *); | |
1537 | extern int filemap_fdatawait(struct address_space *); | |
1538 | extern int filemap_write_and_wait(struct address_space *mapping); | |
1539 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
1540 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
1541 | extern int wait_on_page_writeback_range(struct address_space *mapping, |
1542 | pgoff_t start, pgoff_t end); | |
1543 | extern int __filemap_fdatawrite_range(struct address_space *mapping, | |
1544 | loff_t start, loff_t end, int sync_mode); | |
1545 | ||
18e79b40 | 1546 | extern long do_fsync(struct file *file, int datasync); |
1da177e4 LT |
1547 | extern void sync_supers(void); |
1548 | extern void sync_filesystems(int wait); | |
cf9a2ae8 | 1549 | extern void __fsync_super(struct super_block *sb); |
1da177e4 LT |
1550 | extern void emergency_sync(void); |
1551 | extern void emergency_remount(void); | |
1552 | extern int do_remount_sb(struct super_block *sb, int flags, | |
1553 | void *data, int force); | |
1554 | extern sector_t bmap(struct inode *, sector_t); | |
1da177e4 LT |
1555 | extern int notify_change(struct dentry *, struct iattr *); |
1556 | extern int permission(struct inode *, int, struct nameidata *); | |
1557 | extern int generic_permission(struct inode *, int, | |
1558 | int (*check_acl)(struct inode *, int)); | |
1559 | ||
1560 | extern int get_write_access(struct inode *); | |
1561 | extern int deny_write_access(struct file *); | |
1562 | static inline void put_write_access(struct inode * inode) | |
1563 | { | |
1564 | atomic_dec(&inode->i_writecount); | |
1565 | } | |
1566 | static inline void allow_write_access(struct file *file) | |
1567 | { | |
1568 | if (file) | |
1569 | atomic_inc(&file->f_dentry->d_inode->i_writecount); | |
1570 | } | |
1571 | extern int do_pipe(int *); | |
1572 | ||
5590ff0d | 1573 | extern int open_namei(int dfd, const char *, int, int, struct nameidata *); |
1da177e4 LT |
1574 | extern int may_open(struct nameidata *, int, int); |
1575 | ||
1576 | extern int kernel_read(struct file *, unsigned long, char *, unsigned long); | |
1577 | extern struct file * open_exec(const char *); | |
1578 | ||
1579 | /* fs/dcache.c -- generic fs support functions */ | |
1580 | extern int is_subdir(struct dentry *, struct dentry *); | |
1581 | extern ino_t find_inode_number(struct dentry *, struct qstr *); | |
1582 | ||
1583 | #include <linux/err.h> | |
1584 | ||
1585 | /* needed for stackable file system support */ | |
1586 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); | |
1587 | ||
1588 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); | |
1589 | ||
1590 | extern void inode_init_once(struct inode *); | |
1591 | extern void iput(struct inode *); | |
1592 | extern struct inode * igrab(struct inode *); | |
1593 | extern ino_t iunique(struct super_block *, ino_t); | |
1594 | extern int inode_needs_sync(struct inode *inode); | |
1595 | extern void generic_delete_inode(struct inode *inode); | |
cb2c0233 | 1596 | extern void generic_drop_inode(struct inode *inode); |
1da177e4 | 1597 | |
88bd5121 AA |
1598 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
1599 | unsigned long hashval, int (*test)(struct inode *, void *), | |
1600 | void *data); | |
1da177e4 LT |
1601 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
1602 | int (*test)(struct inode *, void *), void *data); | |
1603 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
1604 | ||
1605 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
1606 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
1607 | extern void unlock_new_inode(struct inode *); | |
1608 | ||
1609 | static inline struct inode *iget(struct super_block *sb, unsigned long ino) | |
1610 | { | |
1611 | struct inode *inode = iget_locked(sb, ino); | |
1612 | ||
1613 | if (inode && (inode->i_state & I_NEW)) { | |
1614 | sb->s_op->read_inode(inode); | |
1615 | unlock_new_inode(inode); | |
1616 | } | |
1617 | ||
1618 | return inode; | |
1619 | } | |
1620 | ||
1621 | extern void __iget(struct inode * inode); | |
1622 | extern void clear_inode(struct inode *); | |
1623 | extern void destroy_inode(struct inode *); | |
1624 | extern struct inode *new_inode(struct super_block *); | |
1625 | extern int remove_suid(struct dentry *); | |
1626 | extern void remove_dquot_ref(struct super_block *, int, struct list_head *); | |
1da177e4 LT |
1627 | |
1628 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
1629 | extern void remove_inode_hash(struct inode *); | |
1630 | static inline void insert_inode_hash(struct inode *inode) { | |
1631 | __insert_inode_hash(inode, inode->i_ino); | |
1632 | } | |
1633 | ||
1634 | extern struct file * get_empty_filp(void); | |
1635 | extern void file_move(struct file *f, struct list_head *list); | |
1636 | extern void file_kill(struct file *f); | |
1637 | struct bio; | |
1638 | extern void submit_bio(int, struct bio *); | |
1639 | extern int bdev_read_only(struct block_device *); | |
1640 | extern int set_blocksize(struct block_device *, int); | |
1641 | extern int sb_set_blocksize(struct super_block *, int); | |
1642 | extern int sb_min_blocksize(struct super_block *, int); | |
1643 | ||
1644 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
1645 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
1646 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1647 | extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1648 | extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *); | |
1649 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); | |
1650 | extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *); | |
1651 | extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t); | |
1652 | extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *); | |
1653 | extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t); | |
1654 | extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, | |
1655 | unsigned long, loff_t *); | |
1656 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, | |
1657 | unsigned long *, loff_t, loff_t *, size_t, size_t); | |
1658 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, | |
1659 | unsigned long, loff_t, loff_t *, size_t, ssize_t); | |
1660 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); | |
1661 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); | |
1662 | ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, | |
1663 | unsigned long nr_segs, loff_t *ppos); | |
1664 | extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); | |
1665 | extern void do_generic_mapping_read(struct address_space *mapping, | |
1666 | struct file_ra_state *, struct file *, | |
1667 | loff_t *, read_descriptor_t *, read_actor_t); | |
88e6faef AM |
1668 | |
1669 | /* fs/splice.c */ | |
cbb7e577 | 1670 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef AM |
1671 | struct pipe_inode_info *, size_t, unsigned int); |
1672 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, | |
cbb7e577 | 1673 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 1674 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 JA |
1675 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1676 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, | |
88e6faef AM |
1677 | size_t len, unsigned int flags); |
1678 | ||
1da177e4 LT |
1679 | extern void |
1680 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
1da177e4 LT |
1681 | extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, |
1682 | unsigned long nr_segs, loff_t *ppos); | |
1683 | ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, | |
1684 | unsigned long nr_segs, loff_t *ppos); | |
1685 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); | |
1686 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); | |
1687 | extern loff_t remote_llseek(struct file *file, loff_t offset, int origin); | |
1688 | extern int generic_file_open(struct inode * inode, struct file * filp); | |
1689 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
1690 | ||
ceffc078 | 1691 | #ifdef CONFIG_FS_XIP |
eb6fe0c3 CO |
1692 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
1693 | loff_t *ppos); | |
ceffc078 CO |
1694 | extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos, |
1695 | size_t count, read_actor_t actor, | |
1696 | void *target); | |
1697 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); | |
eb6fe0c3 CO |
1698 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
1699 | size_t len, loff_t *ppos); | |
ceffc078 | 1700 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
6d79125b CO |
1701 | #else |
1702 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) | |
1703 | { | |
1704 | return 0; | |
1705 | } | |
ceffc078 CO |
1706 | #endif |
1707 | ||
1da177e4 LT |
1708 | static inline void do_generic_file_read(struct file * filp, loff_t *ppos, |
1709 | read_descriptor_t * desc, | |
1710 | read_actor_t actor) | |
1711 | { | |
1712 | do_generic_mapping_read(filp->f_mapping, | |
1713 | &filp->f_ra, | |
1714 | filp, | |
1715 | ppos, | |
1716 | desc, | |
1717 | actor); | |
1718 | } | |
1719 | ||
1720 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, | |
1721 | struct block_device *bdev, const struct iovec *iov, loff_t offset, | |
1d8fa7a2 | 1722 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
1da177e4 LT |
1723 | int lock_type); |
1724 | ||
1725 | enum { | |
1726 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ | |
1727 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ | |
1728 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ | |
1729 | }; | |
1730 | ||
1731 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, | |
1732 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1733 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1734 | dio_iodone_t end_io) |
1735 | { | |
1736 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1737 | nr_segs, get_block, end_io, DIO_LOCKING); |
1da177e4 LT |
1738 | } |
1739 | ||
1740 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, | |
1741 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1742 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1743 | dio_iodone_t end_io) |
1744 | { | |
1745 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1746 | nr_segs, get_block, end_io, DIO_NO_LOCKING); |
1da177e4 LT |
1747 | } |
1748 | ||
1749 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, | |
1750 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1751 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1752 | dio_iodone_t end_io) |
1753 | { | |
1754 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1755 | nr_segs, get_block, end_io, DIO_OWN_LOCKING); |
1da177e4 LT |
1756 | } |
1757 | ||
4b6f5d20 | 1758 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
1759 | |
1760 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
1761 | ||
1762 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); | |
1763 | extern int vfs_follow_link(struct nameidata *, const char *); | |
1764 | extern int page_readlink(struct dentry *, char __user *, int); | |
cc314eef LT |
1765 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
1766 | extern void page_put_link(struct dentry *, struct nameidata *, void *); | |
0adb25d2 KK |
1767 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
1768 | gfp_t gfp_mask); | |
1da177e4 LT |
1769 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
1770 | extern struct inode_operations page_symlink_inode_operations; | |
1771 | extern int generic_readlink(struct dentry *, char __user *, int); | |
1772 | extern void generic_fillattr(struct inode *, struct kstat *); | |
1773 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
1774 | void inode_add_bytes(struct inode *inode, loff_t bytes); | |
1775 | void inode_sub_bytes(struct inode *inode, loff_t bytes); | |
1776 | loff_t inode_get_bytes(struct inode *inode); | |
1777 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
1778 | ||
1779 | extern int vfs_readdir(struct file *, filldir_t, void *); | |
1780 | ||
1781 | extern int vfs_stat(char __user *, struct kstat *); | |
1782 | extern int vfs_lstat(char __user *, struct kstat *); | |
5590ff0d UD |
1783 | extern int vfs_stat_fd(int dfd, char __user *, struct kstat *); |
1784 | extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); | |
1da177e4 LT |
1785 | extern int vfs_fstat(unsigned int, struct kstat *); |
1786 | ||
1787 | extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); | |
1788 | ||
1789 | extern struct file_system_type *get_fs_type(const char *name); | |
1790 | extern struct super_block *get_super(struct block_device *); | |
1791 | extern struct super_block *user_get_super(dev_t); | |
1792 | extern void drop_super(struct super_block *sb); | |
1793 | ||
1794 | extern int dcache_dir_open(struct inode *, struct file *); | |
1795 | extern int dcache_dir_close(struct inode *, struct file *); | |
1796 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
1797 | extern int dcache_readdir(struct file *, void *, filldir_t); | |
1798 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
726c3342 | 1799 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
1800 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
1801 | extern int simple_unlink(struct inode *, struct dentry *); | |
1802 | extern int simple_rmdir(struct inode *, struct dentry *); | |
1803 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1804 | extern int simple_sync_file(struct file *, struct dentry *, int); | |
1805 | extern int simple_empty(struct dentry *); | |
1806 | extern int simple_readpage(struct file *file, struct page *page); | |
1807 | extern int simple_prepare_write(struct file *file, struct page *page, | |
1808 | unsigned offset, unsigned to); | |
1809 | extern int simple_commit_write(struct file *file, struct page *page, | |
1810 | unsigned offset, unsigned to); | |
1811 | ||
1812 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); | |
1813 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); | |
4b6f5d20 | 1814 | extern const struct file_operations simple_dir_operations; |
1da177e4 | 1815 | extern struct inode_operations simple_dir_inode_operations; |
4b6f5d20 | 1816 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 LT |
1817 | struct dentry *d_alloc_name(struct dentry *, const char *); |
1818 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); | |
1f5ce9e9 | 1819 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
1820 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
1821 | ||
1822 | extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); | |
1823 | ||
e965f963 | 1824 | #ifdef CONFIG_MIGRATION |
2d1db3b1 CL |
1825 | extern int buffer_migrate_page(struct address_space *, |
1826 | struct page *, struct page *); | |
e965f963 CL |
1827 | #else |
1828 | #define buffer_migrate_page NULL | |
1829 | #endif | |
1830 | ||
1da177e4 LT |
1831 | extern int inode_change_ok(struct inode *, struct iattr *); |
1832 | extern int __must_check inode_setattr(struct inode *, struct iattr *); | |
1833 | ||
870f4817 | 1834 | extern void file_update_time(struct file *file); |
1da177e4 LT |
1835 | |
1836 | static inline ino_t parent_ino(struct dentry *dentry) | |
1837 | { | |
1838 | ino_t res; | |
1839 | ||
1840 | spin_lock(&dentry->d_lock); | |
1841 | res = dentry->d_parent->d_inode->i_ino; | |
1842 | spin_unlock(&dentry->d_lock); | |
1843 | return res; | |
1844 | } | |
1845 | ||
1846 | /* kernel/fork.c */ | |
1847 | extern int unshare_files(void); | |
1848 | ||
1849 | /* Transaction based IO helpers */ | |
1850 | ||
1851 | /* | |
1852 | * An argresp is stored in an allocated page and holds the | |
1853 | * size of the argument or response, along with its content | |
1854 | */ | |
1855 | struct simple_transaction_argresp { | |
1856 | ssize_t size; | |
1857 | char data[0]; | |
1858 | }; | |
1859 | ||
1860 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
1861 | ||
1862 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
1863 | size_t size); | |
1864 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
1865 | size_t size, loff_t *pos); | |
1866 | int simple_transaction_release(struct inode *inode, struct file *file); | |
1867 | ||
1868 | static inline void simple_transaction_set(struct file *file, size_t n) | |
1869 | { | |
1870 | struct simple_transaction_argresp *ar = file->private_data; | |
1871 | ||
1872 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); | |
1873 | ||
1874 | /* | |
1875 | * The barrier ensures that ar->size will really remain zero until | |
1876 | * ar->data is ready for reading. | |
1877 | */ | |
1878 | smp_mb(); | |
1879 | ar->size = n; | |
1880 | } | |
1881 | ||
acaefc25 AB |
1882 | /* |
1883 | * simple attribute files | |
1884 | * | |
1885 | * These attributes behave similar to those in sysfs: | |
1886 | * | |
1887 | * Writing to an attribute immediately sets a value, an open file can be | |
1888 | * written to multiple times. | |
1889 | * | |
1890 | * Reading from an attribute creates a buffer from the value that might get | |
1891 | * read with multiple read calls. When the attribute has been read | |
1892 | * completely, no further read calls are possible until the file is opened | |
1893 | * again. | |
1894 | * | |
1895 | * All attributes contain a text representation of a numeric value | |
1896 | * that are accessed with the get() and set() functions. | |
1897 | */ | |
1898 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
1899 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
1900 | { \ | |
1901 | __simple_attr_check_format(__fmt, 0ull); \ | |
1902 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
1903 | } \ | |
1904 | static struct file_operations __fops = { \ | |
1905 | .owner = THIS_MODULE, \ | |
1906 | .open = __fops ## _open, \ | |
1907 | .release = simple_attr_close, \ | |
1908 | .read = simple_attr_read, \ | |
1909 | .write = simple_attr_write, \ | |
1910 | }; | |
1911 | ||
1912 | static inline void __attribute__((format(printf, 1, 2))) | |
1913 | __simple_attr_check_format(const char *fmt, ...) | |
1914 | { | |
1915 | /* don't do anything, just let the compiler check the arguments; */ | |
1916 | } | |
1917 | ||
1918 | int simple_attr_open(struct inode *inode, struct file *file, | |
1919 | u64 (*get)(void *), void (*set)(void *, u64), | |
1920 | const char *fmt); | |
1921 | int simple_attr_close(struct inode *inode, struct file *file); | |
1922 | ssize_t simple_attr_read(struct file *file, char __user *buf, | |
1923 | size_t len, loff_t *ppos); | |
1924 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
1925 | size_t len, loff_t *ppos); | |
1926 | ||
1927 | ||
1da177e4 LT |
1928 | #ifdef CONFIG_SECURITY |
1929 | static inline char *alloc_secdata(void) | |
1930 | { | |
1931 | return (char *)get_zeroed_page(GFP_KERNEL); | |
1932 | } | |
1933 | ||
1934 | static inline void free_secdata(void *secdata) | |
1935 | { | |
1936 | free_page((unsigned long)secdata); | |
1937 | } | |
1938 | #else | |
1939 | static inline char *alloc_secdata(void) | |
1940 | { | |
1941 | return (char *)1; | |
1942 | } | |
1943 | ||
1944 | static inline void free_secdata(void *secdata) | |
1945 | { } | |
1946 | #endif /* CONFIG_SECURITY */ | |
1947 | ||
1948 | #endif /* __KERNEL__ */ | |
1949 | #endif /* _LINUX_FS_H */ |