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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 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/limits.h> | |
11 | #include <linux/ioctl.h> | |
ab2af1f5 | 12 | #include <linux/rcuref.h> |
1da177e4 LT |
13 | |
14 | /* | |
15 | * It's silly to have NR_OPEN bigger than NR_FILE, but you can change | |
16 | * the file limit at runtime and only root can increase the per-process | |
17 | * nr_file rlimit, so it's safe to set up a ridiculously high absolute | |
18 | * upper limit on files-per-process. | |
19 | * | |
20 | * Some programs (notably those using select()) may have to be | |
21 | * recompiled to take full advantage of the new limits.. | |
22 | */ | |
23 | ||
24 | /* Fixed constants first: */ | |
25 | #undef NR_OPEN | |
26 | #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */ | |
27 | #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ | |
28 | ||
29 | #define BLOCK_SIZE_BITS 10 | |
30 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) | |
31 | ||
32 | /* And dynamically-tunable limits and defaults: */ | |
33 | struct files_stat_struct { | |
34 | int nr_files; /* read only */ | |
35 | int nr_free_files; /* read only */ | |
36 | int max_files; /* tunable */ | |
37 | }; | |
38 | extern struct files_stat_struct files_stat; | |
39 | ||
40 | struct inodes_stat_t { | |
41 | int nr_inodes; | |
42 | int nr_unused; | |
43 | int dummy[5]; | |
44 | }; | |
45 | extern struct inodes_stat_t inodes_stat; | |
46 | ||
47 | extern int leases_enable, lease_break_time; | |
48 | ||
49 | #ifdef CONFIG_DNOTIFY | |
50 | extern int dir_notify_enable; | |
51 | #endif | |
52 | ||
53 | #define NR_FILE 8192 /* this can well be larger on a larger system */ | |
54 | ||
55 | #define MAY_EXEC 1 | |
56 | #define MAY_WRITE 2 | |
57 | #define MAY_READ 4 | |
58 | #define MAY_APPEND 8 | |
59 | ||
60 | #define FMODE_READ 1 | |
61 | #define FMODE_WRITE 2 | |
62 | ||
63 | /* Internal kernel extensions */ | |
64 | #define FMODE_LSEEK 4 | |
65 | #define FMODE_PREAD 8 | |
66 | #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ | |
67 | ||
68 | #define RW_MASK 1 | |
69 | #define RWA_MASK 2 | |
70 | #define READ 0 | |
71 | #define WRITE 1 | |
72 | #define READA 2 /* read-ahead - don't block if no resources */ | |
a7662236 | 73 | #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
1da177e4 LT |
74 | #define SPECIAL 4 /* For non-blockdevice requests in request queue */ |
75 | #define READ_SYNC (READ | (1 << BIO_RW_SYNC)) | |
76 | #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) | |
77 | #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) | |
78 | ||
79 | #define SEL_IN 1 | |
80 | #define SEL_OUT 2 | |
81 | #define SEL_EX 4 | |
82 | ||
83 | /* public flags for file_system_type */ | |
84 | #define FS_REQUIRES_DEV 1 | |
85 | #define FS_BINARY_MOUNTDATA 2 | |
86 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ | |
87 | #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon | |
88 | * as nfs_rename() will be cleaned up | |
89 | */ | |
90 | /* | |
91 | * These are the fs-independent mount-flags: up to 32 flags are supported | |
92 | */ | |
93 | #define MS_RDONLY 1 /* Mount read-only */ | |
94 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |
95 | #define MS_NODEV 4 /* Disallow access to device special files */ | |
96 | #define MS_NOEXEC 8 /* Disallow program execution */ | |
97 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ | |
98 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ | |
99 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
100 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ | |
101 | #define MS_NOATIME 1024 /* Do not update access times. */ | |
102 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ | |
103 | #define MS_BIND 4096 | |
104 | #define MS_MOVE 8192 | |
105 | #define MS_REC 16384 | |
106 | #define MS_VERBOSE 32768 | |
107 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ | |
108 | #define MS_ACTIVE (1<<30) | |
109 | #define MS_NOUSER (1<<31) | |
110 | ||
111 | /* | |
112 | * Superblock flags that can be altered by MS_REMOUNT | |
113 | */ | |
114 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\ | |
115 | MS_NODIRATIME) | |
116 | ||
117 | /* | |
118 | * Old magic mount flag and mask | |
119 | */ | |
120 | #define MS_MGC_VAL 0xC0ED0000 | |
121 | #define MS_MGC_MSK 0xffff0000 | |
122 | ||
123 | /* Inode flags - they have nothing to superblock flags now */ | |
124 | ||
125 | #define S_SYNC 1 /* Writes are synced at once */ | |
126 | #define S_NOATIME 2 /* Do not update access times */ | |
127 | #define S_APPEND 4 /* Append-only file */ | |
128 | #define S_IMMUTABLE 8 /* Immutable file */ | |
129 | #define S_DEAD 16 /* removed, but still open directory */ | |
130 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
131 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
132 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
133 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
134 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
135 | ||
136 | /* | |
137 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
138 | * flags just means all the inodes inherit those flags by default. It might be | |
139 | * possible to override it selectively if you really wanted to with some | |
140 | * ioctl() that is not currently implemented. | |
141 | * | |
142 | * Exception: MS_RDONLY is always applied to the entire file system. | |
143 | * | |
144 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
145 | * with files in use. This means that all of the inodes will not have their | |
146 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
147 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
148 | */ | |
149 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) | |
150 | ||
151 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
152 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
153 | ((inode)->i_flags & S_SYNC)) | |
154 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
155 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
156 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
157 | ||
158 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
159 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
160 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
161 | #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME)) | |
162 | #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME) | |
163 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) | |
164 | ||
165 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
166 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
167 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
168 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
169 | ||
170 | /* the read-only stuff doesn't really belong here, but any other place is | |
171 | probably as bad and I don't want to create yet another include file. */ | |
172 | ||
173 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ | |
174 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ | |
175 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ | |
176 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ | |
177 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ | |
178 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ | |
179 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ | |
180 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ | |
181 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ | |
182 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ | |
183 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ | |
184 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ | |
185 | #if 0 | |
186 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ | |
187 | ||
188 | /* Some people are morons. Do not use sizeof! */ | |
189 | ||
190 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ | |
191 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ | |
192 | /* This was here just to show that the number is taken - | |
193 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ | |
194 | #endif | |
195 | /* A jump here: 108-111 have been used for various private purposes. */ | |
196 | #define BLKBSZGET _IOR(0x12,112,size_t) | |
197 | #define BLKBSZSET _IOW(0x12,113,size_t) | |
198 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
199 | ||
200 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ | |
201 | #define FIBMAP _IO(0x00,1) /* bmap access */ | |
202 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ | |
203 | ||
204 | #ifdef __KERNEL__ | |
205 | ||
206 | #include <linux/linkage.h> | |
207 | #include <linux/wait.h> | |
208 | #include <linux/types.h> | |
209 | #include <linux/kdev_t.h> | |
210 | #include <linux/dcache.h> | |
211 | #include <linux/stat.h> | |
212 | #include <linux/cache.h> | |
213 | #include <linux/kobject.h> | |
214 | #include <linux/list.h> | |
215 | #include <linux/radix-tree.h> | |
216 | #include <linux/prio_tree.h> | |
217 | #include <linux/init.h> | |
22e2c507 | 218 | #include <linux/sched.h> |
1da177e4 LT |
219 | |
220 | #include <asm/atomic.h> | |
221 | #include <asm/semaphore.h> | |
222 | #include <asm/byteorder.h> | |
223 | ||
224 | struct iovec; | |
225 | struct nameidata; | |
92198f7e | 226 | struct kiocb; |
1da177e4 LT |
227 | struct pipe_inode_info; |
228 | struct poll_table_struct; | |
229 | struct kstatfs; | |
230 | struct vm_area_struct; | |
231 | struct vfsmount; | |
232 | ||
233 | /* Used to be a macro which just called the function, now just a function */ | |
234 | extern void update_atime (struct inode *); | |
235 | ||
236 | extern void __init inode_init(unsigned long); | |
237 | extern void __init inode_init_early(void); | |
238 | extern void __init mnt_init(unsigned long); | |
239 | extern void __init files_init(unsigned long); | |
240 | ||
241 | struct buffer_head; | |
242 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
243 | struct buffer_head *bh_result, int create); | |
244 | typedef int (get_blocks_t)(struct inode *inode, sector_t iblock, | |
245 | unsigned long max_blocks, | |
246 | struct buffer_head *bh_result, int create); | |
92198f7e | 247 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
1da177e4 LT |
248 | ssize_t bytes, void *private); |
249 | ||
250 | /* | |
251 | * Attribute flags. These should be or-ed together to figure out what | |
252 | * has been changed! | |
253 | */ | |
254 | #define ATTR_MODE 1 | |
255 | #define ATTR_UID 2 | |
256 | #define ATTR_GID 4 | |
257 | #define ATTR_SIZE 8 | |
258 | #define ATTR_ATIME 16 | |
259 | #define ATTR_MTIME 32 | |
260 | #define ATTR_CTIME 64 | |
261 | #define ATTR_ATIME_SET 128 | |
262 | #define ATTR_MTIME_SET 256 | |
263 | #define ATTR_FORCE 512 /* Not a change, but a change it */ | |
264 | #define ATTR_ATTR_FLAG 1024 | |
265 | #define ATTR_KILL_SUID 2048 | |
266 | #define ATTR_KILL_SGID 4096 | |
267 | ||
268 | /* | |
269 | * This is the Inode Attributes structure, used for notify_change(). It | |
270 | * uses the above definitions as flags, to know which values have changed. | |
271 | * Also, in this manner, a Filesystem can look at only the values it cares | |
272 | * about. Basically, these are the attributes that the VFS layer can | |
273 | * request to change from the FS layer. | |
274 | * | |
275 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
276 | */ | |
277 | struct iattr { | |
278 | unsigned int ia_valid; | |
279 | umode_t ia_mode; | |
280 | uid_t ia_uid; | |
281 | gid_t ia_gid; | |
282 | loff_t ia_size; | |
283 | struct timespec ia_atime; | |
284 | struct timespec ia_mtime; | |
285 | struct timespec ia_ctime; | |
1da177e4 LT |
286 | }; |
287 | ||
1da177e4 LT |
288 | /* |
289 | * Includes for diskquotas. | |
290 | */ | |
291 | #include <linux/quota.h> | |
292 | ||
293 | /* | |
294 | * oh the beauties of C type declarations. | |
295 | */ | |
296 | struct page; | |
297 | struct address_space; | |
298 | struct writeback_control; | |
1da177e4 LT |
299 | |
300 | struct address_space_operations { | |
301 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
302 | int (*readpage)(struct file *, struct page *); | |
303 | int (*sync_page)(struct page *); | |
304 | ||
305 | /* Write back some dirty pages from this mapping. */ | |
306 | int (*writepages)(struct address_space *, struct writeback_control *); | |
307 | ||
308 | /* Set a page dirty */ | |
309 | int (*set_page_dirty)(struct page *page); | |
310 | ||
311 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
312 | struct list_head *pages, unsigned nr_pages); | |
313 | ||
314 | /* | |
315 | * ext3 requires that a successful prepare_write() call be followed | |
316 | * by a commit_write() call - they must be balanced | |
317 | */ | |
318 | int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); | |
319 | int (*commit_write)(struct file *, struct page *, unsigned, unsigned); | |
320 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ | |
321 | sector_t (*bmap)(struct address_space *, sector_t); | |
322 | int (*invalidatepage) (struct page *, unsigned long); | |
27496a8c | 323 | int (*releasepage) (struct page *, gfp_t); |
1da177e4 LT |
324 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
325 | loff_t offset, unsigned long nr_segs); | |
ceffc078 CO |
326 | struct page* (*get_xip_page)(struct address_space *, sector_t, |
327 | int); | |
1da177e4 LT |
328 | }; |
329 | ||
330 | struct backing_dev_info; | |
331 | struct address_space { | |
332 | struct inode *host; /* owner: inode, block_device */ | |
333 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
334 | rwlock_t tree_lock; /* and rwlock protecting it */ | |
335 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ | |
336 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ | |
337 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ | |
338 | spinlock_t i_mmap_lock; /* protect tree, count, list */ | |
339 | unsigned int truncate_count; /* Cover race condition with truncate */ | |
340 | unsigned long nrpages; /* number of total pages */ | |
341 | pgoff_t writeback_index;/* writeback starts here */ | |
342 | struct address_space_operations *a_ops; /* methods */ | |
343 | unsigned long flags; /* error bits/gfp mask */ | |
344 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ | |
345 | spinlock_t private_lock; /* for use by the address_space */ | |
346 | struct list_head private_list; /* ditto */ | |
347 | struct address_space *assoc_mapping; /* ditto */ | |
348 | } __attribute__((aligned(sizeof(long)))); | |
349 | /* | |
350 | * On most architectures that alignment is already the case; but | |
351 | * must be enforced here for CRIS, to let the least signficant bit | |
352 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. | |
353 | */ | |
354 | ||
355 | struct block_device { | |
356 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
357 | struct inode * bd_inode; /* will die */ | |
358 | int bd_openers; | |
359 | struct semaphore bd_sem; /* open/close mutex */ | |
360 | struct semaphore bd_mount_sem; /* mount mutex */ | |
361 | struct list_head bd_inodes; | |
362 | void * bd_holder; | |
363 | int bd_holders; | |
364 | struct block_device * bd_contains; | |
365 | unsigned bd_block_size; | |
366 | struct hd_struct * bd_part; | |
367 | /* number of times partitions within this device have been opened. */ | |
368 | unsigned bd_part_count; | |
369 | int bd_invalidated; | |
370 | struct gendisk * bd_disk; | |
371 | struct list_head bd_list; | |
372 | struct backing_dev_info *bd_inode_backing_dev_info; | |
373 | /* | |
374 | * Private data. You must have bd_claim'ed the block_device | |
375 | * to use this. NOTE: bd_claim allows an owner to claim | |
376 | * the same device multiple times, the owner must take special | |
377 | * care to not mess up bd_private for that case. | |
378 | */ | |
379 | unsigned long bd_private; | |
380 | }; | |
381 | ||
382 | /* | |
383 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
384 | * radix trees | |
385 | */ | |
386 | #define PAGECACHE_TAG_DIRTY 0 | |
387 | #define PAGECACHE_TAG_WRITEBACK 1 | |
388 | ||
389 | int mapping_tagged(struct address_space *mapping, int tag); | |
390 | ||
391 | /* | |
392 | * Might pages of this file be mapped into userspace? | |
393 | */ | |
394 | static inline int mapping_mapped(struct address_space *mapping) | |
395 | { | |
396 | return !prio_tree_empty(&mapping->i_mmap) || | |
397 | !list_empty(&mapping->i_mmap_nonlinear); | |
398 | } | |
399 | ||
400 | /* | |
401 | * Might pages of this file have been modified in userspace? | |
402 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
403 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
404 | * writing i.e. vma may be mprotected writable even if now readonly. | |
405 | */ | |
406 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
407 | { | |
408 | return mapping->i_mmap_writable != 0; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
413 | */ | |
414 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
415 | #include <linux/seqlock.h> | |
416 | #define __NEED_I_SIZE_ORDERED | |
417 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
418 | #else | |
419 | #define i_size_ordered_init(inode) do { } while (0) | |
420 | #endif | |
421 | ||
422 | struct inode { | |
423 | struct hlist_node i_hash; | |
424 | struct list_head i_list; | |
425 | struct list_head i_sb_list; | |
426 | struct list_head i_dentry; | |
427 | unsigned long i_ino; | |
428 | atomic_t i_count; | |
429 | umode_t i_mode; | |
430 | unsigned int i_nlink; | |
431 | uid_t i_uid; | |
432 | gid_t i_gid; | |
433 | dev_t i_rdev; | |
434 | loff_t i_size; | |
435 | struct timespec i_atime; | |
436 | struct timespec i_mtime; | |
437 | struct timespec i_ctime; | |
438 | unsigned int i_blkbits; | |
439 | unsigned long i_blksize; | |
440 | unsigned long i_version; | |
441 | unsigned long i_blocks; | |
442 | unsigned short i_bytes; | |
443 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ | |
444 | struct semaphore i_sem; | |
445 | struct rw_semaphore i_alloc_sem; | |
446 | struct inode_operations *i_op; | |
447 | struct file_operations *i_fop; /* former ->i_op->default_file_ops */ | |
448 | struct super_block *i_sb; | |
449 | struct file_lock *i_flock; | |
450 | struct address_space *i_mapping; | |
451 | struct address_space i_data; | |
452 | #ifdef CONFIG_QUOTA | |
453 | struct dquot *i_dquot[MAXQUOTAS]; | |
454 | #endif | |
455 | /* These three should probably be a union */ | |
456 | struct list_head i_devices; | |
457 | struct pipe_inode_info *i_pipe; | |
458 | struct block_device *i_bdev; | |
459 | struct cdev *i_cdev; | |
460 | int i_cindex; | |
461 | ||
462 | __u32 i_generation; | |
463 | ||
464 | #ifdef CONFIG_DNOTIFY | |
465 | unsigned long i_dnotify_mask; /* Directory notify events */ | |
466 | struct dnotify_struct *i_dnotify; /* for directory notifications */ | |
467 | #endif | |
468 | ||
0eeca283 RL |
469 | #ifdef CONFIG_INOTIFY |
470 | struct list_head inotify_watches; /* watches on this inode */ | |
471 | struct semaphore inotify_sem; /* protects the watches list */ | |
472 | #endif | |
473 | ||
1da177e4 LT |
474 | unsigned long i_state; |
475 | unsigned long dirtied_when; /* jiffies of first dirtying */ | |
476 | ||
477 | unsigned int i_flags; | |
478 | ||
479 | atomic_t i_writecount; | |
480 | void *i_security; | |
481 | union { | |
482 | void *generic_ip; | |
483 | } u; | |
484 | #ifdef __NEED_I_SIZE_ORDERED | |
485 | seqcount_t i_size_seqcount; | |
486 | #endif | |
487 | }; | |
488 | ||
489 | /* | |
490 | * NOTE: in a 32bit arch with a preemptable kernel and | |
491 | * an UP compile the i_size_read/write must be atomic | |
492 | * with respect to the local cpu (unlike with preempt disabled), | |
493 | * but they don't need to be atomic with respect to other cpus like in | |
494 | * true SMP (so they need either to either locally disable irq around | |
495 | * the read or for example on x86 they can be still implemented as a | |
496 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
497 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
498 | */ | |
499 | static inline loff_t i_size_read(struct inode *inode) | |
500 | { | |
501 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
502 | loff_t i_size; | |
503 | unsigned int seq; | |
504 | ||
505 | do { | |
506 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
507 | i_size = inode->i_size; | |
508 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
509 | return i_size; | |
510 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
511 | loff_t i_size; | |
512 | ||
513 | preempt_disable(); | |
514 | i_size = inode->i_size; | |
515 | preempt_enable(); | |
516 | return i_size; | |
517 | #else | |
518 | return inode->i_size; | |
519 | #endif | |
520 | } | |
521 | ||
522 | ||
523 | static inline void i_size_write(struct inode *inode, loff_t i_size) | |
524 | { | |
525 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
526 | write_seqcount_begin(&inode->i_size_seqcount); | |
527 | inode->i_size = i_size; | |
528 | write_seqcount_end(&inode->i_size_seqcount); | |
529 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
530 | preempt_disable(); | |
531 | inode->i_size = i_size; | |
532 | preempt_enable(); | |
533 | #else | |
534 | inode->i_size = i_size; | |
535 | #endif | |
536 | } | |
537 | ||
538 | static inline unsigned iminor(struct inode *inode) | |
539 | { | |
540 | return MINOR(inode->i_rdev); | |
541 | } | |
542 | ||
543 | static inline unsigned imajor(struct inode *inode) | |
544 | { | |
545 | return MAJOR(inode->i_rdev); | |
546 | } | |
547 | ||
548 | extern struct block_device *I_BDEV(struct inode *inode); | |
549 | ||
550 | struct fown_struct { | |
551 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
552 | int pid; /* pid or -pgrp where SIGIO should be sent */ | |
553 | uid_t uid, euid; /* uid/euid of process setting the owner */ | |
554 | void *security; | |
555 | int signum; /* posix.1b rt signal to be delivered on IO */ | |
556 | }; | |
557 | ||
558 | /* | |
559 | * Track a single file's readahead state | |
560 | */ | |
561 | struct file_ra_state { | |
562 | unsigned long start; /* Current window */ | |
563 | unsigned long size; | |
564 | unsigned long flags; /* ra flags RA_FLAG_xxx*/ | |
565 | unsigned long cache_hit; /* cache hit count*/ | |
566 | unsigned long prev_page; /* Cache last read() position */ | |
567 | unsigned long ahead_start; /* Ahead window */ | |
568 | unsigned long ahead_size; | |
569 | unsigned long ra_pages; /* Maximum readahead window */ | |
570 | unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ | |
571 | unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ | |
572 | }; | |
573 | #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ | |
574 | #define RA_FLAG_INCACHE 0x02 /* file is already in cache */ | |
575 | ||
576 | struct file { | |
2f512016 ED |
577 | /* |
578 | * fu_list becomes invalid after file_free is called and queued via | |
579 | * fu_rcuhead for RCU freeing | |
580 | */ | |
581 | union { | |
582 | struct list_head fu_list; | |
583 | struct rcu_head fu_rcuhead; | |
584 | } f_u; | |
1da177e4 LT |
585 | struct dentry *f_dentry; |
586 | struct vfsmount *f_vfsmnt; | |
587 | struct file_operations *f_op; | |
588 | atomic_t f_count; | |
589 | unsigned int f_flags; | |
590 | mode_t f_mode; | |
1da177e4 LT |
591 | loff_t f_pos; |
592 | struct fown_struct f_owner; | |
593 | unsigned int f_uid, f_gid; | |
594 | struct file_ra_state f_ra; | |
595 | ||
1da177e4 LT |
596 | unsigned long f_version; |
597 | void *f_security; | |
598 | ||
599 | /* needed for tty driver, and maybe others */ | |
600 | void *private_data; | |
601 | ||
602 | #ifdef CONFIG_EPOLL | |
603 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
604 | struct list_head f_ep_links; | |
605 | spinlock_t f_ep_lock; | |
606 | #endif /* #ifdef CONFIG_EPOLL */ | |
607 | struct address_space *f_mapping; | |
608 | }; | |
609 | extern spinlock_t files_lock; | |
610 | #define file_list_lock() spin_lock(&files_lock); | |
611 | #define file_list_unlock() spin_unlock(&files_lock); | |
612 | ||
ab2af1f5 | 613 | #define get_file(x) rcuref_inc(&(x)->f_count) |
1da177e4 LT |
614 | #define file_count(x) atomic_read(&(x)->f_count) |
615 | ||
616 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
617 | ||
618 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
619 | limits, otherwise bad things can happen in VM. */ | |
620 | #if BITS_PER_LONG==32 | |
621 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) | |
622 | #elif BITS_PER_LONG==64 | |
623 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL | |
624 | #endif | |
625 | ||
626 | #define FL_POSIX 1 | |
627 | #define FL_FLOCK 2 | |
628 | #define FL_ACCESS 8 /* not trying to lock, just looking */ | |
629 | #define FL_LOCKD 16 /* lock held by rpc.lockd */ | |
630 | #define FL_LEASE 32 /* lease held on this file */ | |
631 | #define FL_SLEEP 128 /* A blocking lock */ | |
632 | ||
633 | /* | |
634 | * The POSIX file lock owner is determined by | |
635 | * the "struct files_struct" in the thread group | |
636 | * (or NULL for no owner - BSD locks). | |
637 | * | |
638 | * Lockd stuffs a "host" pointer into this. | |
639 | */ | |
640 | typedef struct files_struct *fl_owner_t; | |
641 | ||
642 | struct file_lock_operations { | |
643 | void (*fl_insert)(struct file_lock *); /* lock insertion callback */ | |
644 | void (*fl_remove)(struct file_lock *); /* lock removal callback */ | |
645 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
646 | void (*fl_release_private)(struct file_lock *); | |
647 | }; | |
648 | ||
649 | struct lock_manager_operations { | |
650 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); | |
651 | void (*fl_notify)(struct file_lock *); /* unblock callback */ | |
652 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
653 | void (*fl_release_private)(struct file_lock *); | |
654 | void (*fl_break)(struct file_lock *); | |
655 | int (*fl_mylease)(struct file_lock *, struct file_lock *); | |
656 | int (*fl_change)(struct file_lock **, int); | |
657 | }; | |
658 | ||
659 | /* that will die - we need it for nfs_lock_info */ | |
660 | #include <linux/nfs_fs_i.h> | |
661 | ||
662 | struct file_lock { | |
663 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
664 | struct list_head fl_link; /* doubly linked list of all locks */ | |
665 | struct list_head fl_block; /* circular list of blocked processes */ | |
666 | fl_owner_t fl_owner; | |
667 | unsigned int fl_pid; | |
668 | wait_queue_head_t fl_wait; | |
669 | struct file *fl_file; | |
670 | unsigned char fl_flags; | |
671 | unsigned char fl_type; | |
672 | loff_t fl_start; | |
673 | loff_t fl_end; | |
674 | ||
675 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
676 | unsigned long fl_break_time; /* for nonblocking lease breaks */ | |
677 | ||
678 | struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ | |
679 | struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ | |
680 | union { | |
681 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 682 | struct nfs4_lock_info nfs4_fl; |
1da177e4 LT |
683 | } fl_u; |
684 | }; | |
685 | ||
686 | /* The following constant reflects the upper bound of the file/locking space */ | |
687 | #ifndef OFFSET_MAX | |
688 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
689 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
690 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
691 | #endif | |
692 | ||
693 | extern struct list_head file_lock_list; | |
694 | ||
695 | #include <linux/fcntl.h> | |
696 | ||
697 | extern int fcntl_getlk(struct file *, struct flock __user *); | |
c293621b PS |
698 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
699 | struct flock __user *); | |
1da177e4 LT |
700 | |
701 | #if BITS_PER_LONG == 32 | |
702 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); | |
c293621b PS |
703 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
704 | struct flock64 __user *); | |
1da177e4 LT |
705 | #endif |
706 | ||
707 | extern void send_sigio(struct fown_struct *fown, int fd, int band); | |
708 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); | |
709 | extern int fcntl_getlease(struct file *filp); | |
710 | ||
711 | /* fs/locks.c */ | |
712 | extern void locks_init_lock(struct file_lock *); | |
713 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); | |
714 | extern void locks_remove_posix(struct file *, fl_owner_t); | |
715 | extern void locks_remove_flock(struct file *); | |
716 | extern struct file_lock *posix_test_lock(struct file *, struct file_lock *); | |
717 | extern int posix_lock_file(struct file *, struct file_lock *); | |
718 | extern int posix_lock_file_wait(struct file *, struct file_lock *); | |
719 | extern void posix_block_lock(struct file_lock *, struct file_lock *); | |
720 | extern void posix_unblock_lock(struct file *, struct file_lock *); | |
721 | extern int posix_locks_deadlock(struct file_lock *, struct file_lock *); | |
722 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); | |
723 | extern int __break_lease(struct inode *inode, unsigned int flags); | |
724 | extern void lease_get_mtime(struct inode *, struct timespec *time); | |
725 | extern int setlease(struct file *, long, struct file_lock **); | |
726 | extern int lease_modify(struct file_lock **, int); | |
727 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); | |
728 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); | |
729 | extern void steal_locks(fl_owner_t from); | |
730 | ||
731 | struct fasync_struct { | |
732 | int magic; | |
733 | int fa_fd; | |
734 | struct fasync_struct *fa_next; /* singly linked list */ | |
735 | struct file *fa_file; | |
736 | }; | |
737 | ||
738 | #define FASYNC_MAGIC 0x4601 | |
739 | ||
740 | /* SMP safe fasync helpers: */ | |
741 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
742 | /* can be called from interrupts */ | |
743 | extern void kill_fasync(struct fasync_struct **, int, int); | |
744 | /* only for net: no internal synchronization */ | |
745 | extern void __kill_fasync(struct fasync_struct *, int, int); | |
746 | ||
747 | extern int f_setown(struct file *filp, unsigned long arg, int force); | |
748 | extern void f_delown(struct file *filp); | |
749 | extern int send_sigurg(struct fown_struct *fown); | |
750 | ||
751 | /* | |
752 | * Umount options | |
753 | */ | |
754 | ||
755 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
756 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
757 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
758 | ||
759 | extern struct list_head super_blocks; | |
760 | extern spinlock_t sb_lock; | |
761 | ||
762 | #define sb_entry(list) list_entry((list), struct super_block, s_list) | |
763 | #define S_BIAS (1<<30) | |
764 | struct super_block { | |
765 | struct list_head s_list; /* Keep this first */ | |
766 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
767 | unsigned long s_blocksize; | |
768 | unsigned long s_old_blocksize; | |
769 | unsigned char s_blocksize_bits; | |
770 | unsigned char s_dirt; | |
771 | unsigned long long s_maxbytes; /* Max file size */ | |
772 | struct file_system_type *s_type; | |
773 | struct super_operations *s_op; | |
774 | struct dquot_operations *dq_op; | |
775 | struct quotactl_ops *s_qcop; | |
776 | struct export_operations *s_export_op; | |
777 | unsigned long s_flags; | |
778 | unsigned long s_magic; | |
779 | struct dentry *s_root; | |
780 | struct rw_semaphore s_umount; | |
781 | struct semaphore s_lock; | |
782 | int s_count; | |
783 | int s_syncing; | |
784 | int s_need_sync_fs; | |
785 | atomic_t s_active; | |
786 | void *s_security; | |
787 | struct xattr_handler **s_xattr; | |
788 | ||
789 | struct list_head s_inodes; /* all inodes */ | |
790 | struct list_head s_dirty; /* dirty inodes */ | |
791 | struct list_head s_io; /* parked for writeback */ | |
792 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ | |
793 | struct list_head s_files; | |
794 | ||
795 | struct block_device *s_bdev; | |
796 | struct list_head s_instances; | |
797 | struct quota_info s_dquot; /* Diskquota specific options */ | |
798 | ||
799 | int s_frozen; | |
800 | wait_queue_head_t s_wait_unfrozen; | |
801 | ||
802 | char s_id[32]; /* Informational name */ | |
803 | ||
804 | void *s_fs_info; /* Filesystem private info */ | |
805 | ||
806 | /* | |
807 | * The next field is for VFS *only*. No filesystems have any business | |
808 | * even looking at it. You had been warned. | |
809 | */ | |
810 | struct semaphore s_vfs_rename_sem; /* Kludge */ | |
811 | ||
812 | /* Granuality of c/m/atime in ns. | |
813 | Cannot be worse than a second */ | |
814 | u32 s_time_gran; | |
815 | }; | |
816 | ||
817 | extern struct timespec current_fs_time(struct super_block *sb); | |
818 | ||
819 | /* | |
820 | * Snapshotting support. | |
821 | */ | |
822 | enum { | |
823 | SB_UNFROZEN = 0, | |
824 | SB_FREEZE_WRITE = 1, | |
825 | SB_FREEZE_TRANS = 2, | |
826 | }; | |
827 | ||
828 | #define vfs_check_frozen(sb, level) \ | |
829 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) | |
830 | ||
22e2c507 JA |
831 | static inline void get_fs_excl(void) |
832 | { | |
833 | atomic_inc(¤t->fs_excl); | |
834 | } | |
835 | ||
836 | static inline void put_fs_excl(void) | |
837 | { | |
838 | atomic_dec(¤t->fs_excl); | |
839 | } | |
840 | ||
841 | static inline int has_fs_excl(void) | |
842 | { | |
843 | return atomic_read(¤t->fs_excl); | |
844 | } | |
845 | ||
846 | ||
1da177e4 LT |
847 | /* |
848 | * Superblock locking. | |
849 | */ | |
850 | static inline void lock_super(struct super_block * sb) | |
851 | { | |
22e2c507 | 852 | get_fs_excl(); |
1da177e4 LT |
853 | down(&sb->s_lock); |
854 | } | |
855 | ||
856 | static inline void unlock_super(struct super_block * sb) | |
857 | { | |
22e2c507 | 858 | put_fs_excl(); |
1da177e4 LT |
859 | up(&sb->s_lock); |
860 | } | |
861 | ||
862 | /* | |
863 | * VFS helper functions.. | |
864 | */ | |
865 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
866 | extern int vfs_mkdir(struct inode *, struct dentry *, int); | |
867 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
868 | extern int vfs_symlink(struct inode *, struct dentry *, const char *, int); | |
869 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); | |
870 | extern int vfs_rmdir(struct inode *, struct dentry *); | |
871 | extern int vfs_unlink(struct inode *, struct dentry *); | |
872 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
873 | ||
874 | /* | |
875 | * VFS dentry helper functions. | |
876 | */ | |
877 | extern void dentry_unhash(struct dentry *dentry); | |
878 | ||
879 | /* | |
880 | * File types | |
881 | * | |
882 | * NOTE! These match bits 12..15 of stat.st_mode | |
883 | * (ie "(i_mode >> 12) & 15"). | |
884 | */ | |
885 | #define DT_UNKNOWN 0 | |
886 | #define DT_FIFO 1 | |
887 | #define DT_CHR 2 | |
888 | #define DT_DIR 4 | |
889 | #define DT_BLK 6 | |
890 | #define DT_REG 8 | |
891 | #define DT_LNK 10 | |
892 | #define DT_SOCK 12 | |
893 | #define DT_WHT 14 | |
894 | ||
895 | #define OSYNC_METADATA (1<<0) | |
896 | #define OSYNC_DATA (1<<1) | |
897 | #define OSYNC_INODE (1<<2) | |
898 | int generic_osync_inode(struct inode *, struct address_space *, int); | |
899 | ||
900 | /* | |
901 | * This is the "filldir" function type, used by readdir() to let | |
902 | * the kernel specify what kind of dirent layout it wants to have. | |
903 | * This allows the kernel to read directories into kernel space or | |
904 | * to have different dirent layouts depending on the binary type. | |
905 | */ | |
906 | typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned); | |
907 | ||
908 | struct block_device_operations { | |
909 | int (*open) (struct inode *, struct file *); | |
910 | int (*release) (struct inode *, struct file *); | |
911 | int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); | |
bb93e3a5 | 912 | long (*unlocked_ioctl) (struct file *, unsigned, unsigned long); |
1da177e4 | 913 | long (*compat_ioctl) (struct file *, unsigned, unsigned long); |
420edbcc | 914 | int (*direct_access) (struct block_device *, sector_t, unsigned long *); |
1da177e4 LT |
915 | int (*media_changed) (struct gendisk *); |
916 | int (*revalidate_disk) (struct gendisk *); | |
917 | struct module *owner; | |
918 | }; | |
919 | ||
920 | /* | |
921 | * "descriptor" for what we're up to with a read for sendfile(). | |
922 | * This allows us to use the same read code yet | |
923 | * have multiple different users of the data that | |
924 | * we read from a file. | |
925 | * | |
926 | * The simplest case just copies the data to user | |
927 | * mode. | |
928 | */ | |
929 | typedef struct { | |
930 | size_t written; | |
931 | size_t count; | |
932 | union { | |
933 | char __user * buf; | |
934 | void *data; | |
935 | } arg; | |
936 | int error; | |
937 | } read_descriptor_t; | |
938 | ||
939 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); | |
940 | ||
941 | /* These macros are for out of kernel modules to test that | |
942 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
943 | * fields in struct file_operations. */ | |
944 | #define HAVE_COMPAT_IOCTL 1 | |
945 | #define HAVE_UNLOCKED_IOCTL 1 | |
946 | ||
947 | /* | |
948 | * NOTE: | |
949 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl | |
950 | * can be called without the big kernel lock held in all filesystems. | |
951 | */ | |
952 | struct file_operations { | |
953 | struct module *owner; | |
954 | loff_t (*llseek) (struct file *, loff_t, int); | |
955 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
956 | ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); | |
957 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); | |
958 | ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); | |
959 | int (*readdir) (struct file *, void *, filldir_t); | |
960 | unsigned int (*poll) (struct file *, struct poll_table_struct *); | |
961 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); | |
962 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); | |
963 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
964 | int (*mmap) (struct file *, struct vm_area_struct *); | |
965 | int (*open) (struct inode *, struct file *); | |
966 | int (*flush) (struct file *); | |
967 | int (*release) (struct inode *, struct file *); | |
968 | int (*fsync) (struct file *, struct dentry *, int datasync); | |
969 | int (*aio_fsync) (struct kiocb *, int datasync); | |
970 | int (*fasync) (int, struct file *, int); | |
971 | int (*lock) (struct file *, int, struct file_lock *); | |
972 | ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); | |
973 | ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); | |
974 | ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); | |
975 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); | |
976 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
977 | int (*check_flags)(int); | |
978 | int (*dir_notify)(struct file *filp, unsigned long arg); | |
979 | int (*flock) (struct file *, int, struct file_lock *); | |
980 | }; | |
981 | ||
982 | struct inode_operations { | |
983 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); | |
984 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); | |
985 | int (*link) (struct dentry *,struct inode *,struct dentry *); | |
986 | int (*unlink) (struct inode *,struct dentry *); | |
987 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
988 | int (*mkdir) (struct inode *,struct dentry *,int); | |
989 | int (*rmdir) (struct inode *,struct dentry *); | |
990 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); | |
991 | int (*rename) (struct inode *, struct dentry *, | |
992 | struct inode *, struct dentry *); | |
993 | int (*readlink) (struct dentry *, char __user *,int); | |
cc314eef LT |
994 | void * (*follow_link) (struct dentry *, struct nameidata *); |
995 | void (*put_link) (struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
996 | void (*truncate) (struct inode *); |
997 | int (*permission) (struct inode *, int, struct nameidata *); | |
998 | int (*setattr) (struct dentry *, struct iattr *); | |
999 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1000 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); | |
1001 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); | |
1002 | ssize_t (*listxattr) (struct dentry *, char *, size_t); | |
1003 | int (*removexattr) (struct dentry *, const char *); | |
1004 | }; | |
1005 | ||
1006 | struct seq_file; | |
1007 | ||
1008 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); | |
1009 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1010 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
1011 | unsigned long, loff_t *); | |
1012 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, | |
1013 | unsigned long, loff_t *); | |
1014 | ||
1015 | /* | |
1016 | * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called | |
1017 | * without the big kernel lock held in all filesystems. | |
1018 | */ | |
1019 | struct super_operations { | |
1020 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1021 | void (*destroy_inode)(struct inode *); | |
1022 | ||
1023 | void (*read_inode) (struct inode *); | |
1024 | ||
1025 | void (*dirty_inode) (struct inode *); | |
1026 | int (*write_inode) (struct inode *, int); | |
1027 | void (*put_inode) (struct inode *); | |
1028 | void (*drop_inode) (struct inode *); | |
1029 | void (*delete_inode) (struct inode *); | |
1030 | void (*put_super) (struct super_block *); | |
1031 | void (*write_super) (struct super_block *); | |
1032 | int (*sync_fs)(struct super_block *sb, int wait); | |
1033 | void (*write_super_lockfs) (struct super_block *); | |
1034 | void (*unlockfs) (struct super_block *); | |
1035 | int (*statfs) (struct super_block *, struct kstatfs *); | |
1036 | int (*remount_fs) (struct super_block *, int *, char *); | |
1037 | void (*clear_inode) (struct inode *); | |
1038 | void (*umount_begin) (struct super_block *); | |
1039 | ||
1040 | int (*show_options)(struct seq_file *, struct vfsmount *); | |
1041 | ||
1042 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); | |
1043 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
1044 | }; | |
1045 | ||
1046 | /* Inode state bits. Protected by inode_lock. */ | |
1047 | #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */ | |
1048 | #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */ | |
1049 | #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */ | |
1050 | #define __I_LOCK 3 | |
1051 | #define I_LOCK (1 << __I_LOCK) | |
1052 | #define I_FREEING 16 | |
1053 | #define I_CLEAR 32 | |
1054 | #define I_NEW 64 | |
991114c6 | 1055 | #define I_WILL_FREE 128 |
1da177e4 LT |
1056 | |
1057 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
1058 | ||
1059 | extern void __mark_inode_dirty(struct inode *, int); | |
1060 | static inline void mark_inode_dirty(struct inode *inode) | |
1061 | { | |
1062 | __mark_inode_dirty(inode, I_DIRTY); | |
1063 | } | |
1064 | ||
1065 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1066 | { | |
1067 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1068 | } | |
1069 | ||
1070 | static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry) | |
1071 | { | |
1072 | /* per-mountpoint checks will go here */ | |
1073 | update_atime(dentry->d_inode); | |
1074 | } | |
1075 | ||
1076 | static inline void file_accessed(struct file *file) | |
1077 | { | |
1078 | if (!(file->f_flags & O_NOATIME)) | |
1079 | touch_atime(file->f_vfsmnt, file->f_dentry); | |
1080 | } | |
1081 | ||
1082 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
1083 | ||
1084 | /** | |
4dc3b16b PP |
1085 | * struct export_operations - for nfsd to communicate with file systems |
1086 | * @decode_fh: decode a file handle fragment and return a &struct dentry | |
1087 | * @encode_fh: encode a file handle fragment from a dentry | |
1088 | * @get_name: find the name for a given inode in a given directory | |
1089 | * @get_parent: find the parent of a given directory | |
1090 | * @get_dentry: find a dentry for the inode given a file handle sub-fragment | |
1da177e4 LT |
1091 | * |
1092 | * Description: | |
1093 | * The export_operations structure provides a means for nfsd to communicate | |
1094 | * with a particular exported file system - particularly enabling nfsd and | |
1095 | * the filesystem to co-operate when dealing with file handles. | |
1096 | * | |
67be2dd1 MW |
1097 | * export_operations contains two basic operation for dealing with file |
1098 | * handles, decode_fh() and encode_fh(), and allows for some other | |
1099 | * operations to be defined which standard helper routines use to get | |
1100 | * specific information from the filesystem. | |
1da177e4 LT |
1101 | * |
1102 | * nfsd encodes information use to determine which filesystem a filehandle | |
67be2dd1 MW |
1103 | * applies to in the initial part of the file handle. The remainder, termed |
1104 | * a file handle fragment, is controlled completely by the filesystem. The | |
1105 | * standard helper routines assume that this fragment will contain one or | |
1106 | * two sub-fragments, one which identifies the file, and one which may be | |
1107 | * used to identify the (a) directory containing the file. | |
1da177e4 LT |
1108 | * |
1109 | * In some situations, nfsd needs to get a dentry which is connected into a | |
67be2dd1 MW |
1110 | * specific part of the file tree. To allow for this, it passes the |
1111 | * function acceptable() together with a @context which can be used to see | |
1112 | * if the dentry is acceptable. As there can be multiple dentrys for a | |
1113 | * given file, the filesystem should check each one for acceptability before | |
1114 | * looking for the next. As soon as an acceptable one is found, it should | |
1115 | * be returned. | |
1da177e4 LT |
1116 | * |
1117 | * decode_fh: | |
67be2dd1 MW |
1118 | * @decode_fh is given a &struct super_block (@sb), a file handle fragment |
1119 | * (@fh, @fh_len) and an acceptability testing function (@acceptable, | |
1120 | * @context). It should return a &struct dentry which refers to the same | |
1121 | * file that the file handle fragment refers to, and which passes the | |
1122 | * acceptability test. If it cannot, it should return a %NULL pointer if | |
1123 | * the file was found but no acceptable &dentries were available, or a | |
1124 | * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or | |
1125 | * %ENOMEM). | |
1da177e4 LT |
1126 | * |
1127 | * encode_fh: | |
67be2dd1 MW |
1128 | * @encode_fh should store in the file handle fragment @fh (using at most |
1129 | * @max_len bytes) information that can be used by @decode_fh to recover the | |
1130 | * file refered to by the &struct dentry @de. If the @connectable flag is | |
1131 | * set, the encode_fh() should store sufficient information so that a good | |
1132 | * attempt can be made to find not only the file but also it's place in the | |
1133 | * filesystem. This typically means storing a reference to de->d_parent in | |
1134 | * the filehandle fragment. encode_fh() should return the number of bytes | |
1135 | * stored or a negative error code such as %-ENOSPC | |
1da177e4 LT |
1136 | * |
1137 | * get_name: | |
67be2dd1 MW |
1138 | * @get_name should find a name for the given @child in the given @parent |
1139 | * directory. The name should be stored in the @name (with the | |
1140 | * understanding that it is already pointing to a a %NAME_MAX+1 sized | |
1141 | * buffer. get_name() should return %0 on success, a negative error code | |
1142 | * or error. @get_name will be called without @parent->i_sem held. | |
1da177e4 LT |
1143 | * |
1144 | * get_parent: | |
67be2dd1 MW |
1145 | * @get_parent should find the parent directory for the given @child which |
1146 | * is also a directory. In the event that it cannot be found, or storage | |
1147 | * space cannot be allocated, a %ERR_PTR should be returned. | |
1da177e4 LT |
1148 | * |
1149 | * get_dentry: | |
67be2dd1 MW |
1150 | * Given a &super_block (@sb) and a pointer to a file-system specific inode |
1151 | * identifier, possibly an inode number, (@inump) get_dentry() should find | |
1152 | * the identified inode and return a dentry for that inode. Any suitable | |
1153 | * dentry can be returned including, if necessary, a new dentry created with | |
1154 | * d_alloc_root. The caller can then find any other extant dentrys by | |
1155 | * following the d_alias links. If a new dentry was created using | |
1156 | * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry | |
1157 | * should be d_rehash()ed. | |
1da177e4 | 1158 | * |
67be2dd1 MW |
1159 | * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code |
1160 | * can be returned. The @inump will be whatever was passed to | |
1161 | * nfsd_find_fh_dentry() in either the @obj or @parent parameters. | |
1da177e4 LT |
1162 | * |
1163 | * Locking rules: | |
67be2dd1 MW |
1164 | * get_parent is called with child->d_inode->i_sem down |
1165 | * get_name is not (which is possibly inconsistent) | |
1da177e4 LT |
1166 | */ |
1167 | ||
1168 | struct export_operations { | |
1169 | struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, | |
1170 | int (*acceptable)(void *context, struct dentry *de), | |
1171 | void *context); | |
1172 | int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, | |
1173 | int connectable); | |
1174 | ||
1175 | /* the following are only called from the filesystem itself */ | |
1176 | int (*get_name)(struct dentry *parent, char *name, | |
1177 | struct dentry *child); | |
1178 | struct dentry * (*get_parent)(struct dentry *child); | |
1179 | struct dentry * (*get_dentry)(struct super_block *sb, void *inump); | |
1180 | ||
1181 | /* This is set by the exporting module to a standard helper */ | |
1182 | struct dentry * (*find_exported_dentry)( | |
1183 | struct super_block *sb, void *obj, void *parent, | |
1184 | int (*acceptable)(void *context, struct dentry *de), | |
1185 | void *context); | |
1186 | ||
1187 | ||
1188 | }; | |
1189 | ||
1190 | extern struct dentry * | |
1191 | find_exported_dentry(struct super_block *sb, void *obj, void *parent, | |
1192 | int (*acceptable)(void *context, struct dentry *de), | |
1193 | void *context); | |
1194 | ||
1195 | struct file_system_type { | |
1196 | const char *name; | |
1197 | int fs_flags; | |
1198 | struct super_block *(*get_sb) (struct file_system_type *, int, | |
1199 | const char *, void *); | |
1200 | void (*kill_sb) (struct super_block *); | |
1201 | struct module *owner; | |
1202 | struct file_system_type * next; | |
1203 | struct list_head fs_supers; | |
1204 | }; | |
1205 | ||
1206 | struct super_block *get_sb_bdev(struct file_system_type *fs_type, | |
1207 | int flags, const char *dev_name, void *data, | |
1208 | int (*fill_super)(struct super_block *, void *, int)); | |
1209 | struct super_block *get_sb_single(struct file_system_type *fs_type, | |
1210 | int flags, void *data, | |
1211 | int (*fill_super)(struct super_block *, void *, int)); | |
1212 | struct super_block *get_sb_nodev(struct file_system_type *fs_type, | |
1213 | int flags, void *data, | |
1214 | int (*fill_super)(struct super_block *, void *, int)); | |
1215 | void generic_shutdown_super(struct super_block *sb); | |
1216 | void kill_block_super(struct super_block *sb); | |
1217 | void kill_anon_super(struct super_block *sb); | |
1218 | void kill_litter_super(struct super_block *sb); | |
1219 | void deactivate_super(struct super_block *sb); | |
1220 | int set_anon_super(struct super_block *s, void *data); | |
1221 | struct super_block *sget(struct file_system_type *type, | |
1222 | int (*test)(struct super_block *,void *), | |
1223 | int (*set)(struct super_block *,void *), | |
1224 | void *data); | |
1225 | struct super_block *get_sb_pseudo(struct file_system_type *, char *, | |
1226 | struct super_operations *ops, unsigned long); | |
1227 | int __put_super(struct super_block *sb); | |
1228 | int __put_super_and_need_restart(struct super_block *sb); | |
1229 | void unnamed_dev_init(void); | |
1230 | ||
1231 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
1232 | #define fops_get(fops) \ | |
1233 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
1234 | #define fops_put(fops) \ | |
1235 | do { if (fops) module_put((fops)->owner); } while(0) | |
1236 | ||
1237 | extern int register_filesystem(struct file_system_type *); | |
1238 | extern int unregister_filesystem(struct file_system_type *); | |
1239 | extern struct vfsmount *kern_mount(struct file_system_type *); | |
1240 | extern int may_umount_tree(struct vfsmount *); | |
1241 | extern int may_umount(struct vfsmount *); | |
1242 | extern long do_mount(char *, char *, char *, unsigned long, void *); | |
1243 | ||
1244 | extern int vfs_statfs(struct super_block *, struct kstatfs *); | |
1245 | ||
1246 | #define FLOCK_VERIFY_READ 1 | |
1247 | #define FLOCK_VERIFY_WRITE 2 | |
1248 | ||
1249 | extern int locks_mandatory_locked(struct inode *); | |
1250 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); | |
1251 | ||
1252 | /* | |
1253 | * Candidates for mandatory locking have the setgid bit set | |
1254 | * but no group execute bit - an otherwise meaningless combination. | |
1255 | */ | |
1256 | #define MANDATORY_LOCK(inode) \ | |
1257 | (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
1258 | ||
1259 | static inline int locks_verify_locked(struct inode *inode) | |
1260 | { | |
1261 | if (MANDATORY_LOCK(inode)) | |
1262 | return locks_mandatory_locked(inode); | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); | |
1267 | ||
1268 | static inline int locks_verify_truncate(struct inode *inode, | |
1269 | struct file *filp, | |
1270 | loff_t size) | |
1271 | { | |
1272 | if (inode->i_flock && MANDATORY_LOCK(inode)) | |
1273 | return locks_mandatory_area( | |
1274 | FLOCK_VERIFY_WRITE, inode, filp, | |
1275 | size < inode->i_size ? size : inode->i_size, | |
1276 | (size < inode->i_size ? inode->i_size - size | |
1277 | : size - inode->i_size) | |
1278 | ); | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
1283 | { | |
1284 | if (inode->i_flock) | |
1285 | return __break_lease(inode, mode); | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /* fs/open.c */ | |
1290 | ||
1291 | extern int do_truncate(struct dentry *, loff_t start); | |
e922efc3 | 1292 | extern long do_sys_open(const char __user *filename, int flags, int mode); |
1da177e4 LT |
1293 | extern struct file *filp_open(const char *, int, int); |
1294 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int); | |
1295 | extern int filp_close(struct file *, fl_owner_t id); | |
1296 | extern char * getname(const char __user *); | |
1297 | ||
1298 | /* fs/dcache.c */ | |
1299 | extern void __init vfs_caches_init_early(void); | |
1300 | extern void __init vfs_caches_init(unsigned long); | |
1301 | ||
1302 | #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL) | |
1303 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) | |
1304 | #ifndef CONFIG_AUDITSYSCALL | |
1305 | #define putname(name) __putname(name) | |
1306 | #else | |
1307 | extern void putname(const char *name); | |
1308 | #endif | |
1309 | ||
1310 | extern int register_blkdev(unsigned int, const char *); | |
1311 | extern int unregister_blkdev(unsigned int, const char *); | |
1312 | extern struct block_device *bdget(dev_t); | |
1313 | extern void bd_set_size(struct block_device *, loff_t size); | |
1314 | extern void bd_forget(struct inode *inode); | |
1315 | extern void bdput(struct block_device *); | |
1316 | extern struct block_device *open_by_devnum(dev_t, unsigned); | |
1317 | extern struct file_operations def_blk_fops; | |
1318 | extern struct address_space_operations def_blk_aops; | |
1319 | extern struct file_operations def_chr_fops; | |
1320 | extern struct file_operations bad_sock_fops; | |
1321 | extern struct file_operations def_fifo_fops; | |
1322 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); | |
1323 | extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); | |
1324 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); | |
1325 | extern int blkdev_get(struct block_device *, mode_t, unsigned); | |
1326 | extern int blkdev_put(struct block_device *); | |
1327 | extern int bd_claim(struct block_device *, void *); | |
1328 | extern void bd_release(struct block_device *); | |
1329 | ||
1330 | /* fs/char_dev.c */ | |
1331 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); | |
1332 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1333 | extern int register_chrdev(unsigned int, const char *, | |
1334 | struct file_operations *); | |
1335 | extern int unregister_chrdev(unsigned int, const char *); | |
1336 | extern void unregister_chrdev_region(dev_t, unsigned); | |
1337 | extern int chrdev_open(struct inode *, struct file *); | |
1338 | ||
1339 | /* fs/block_dev.c */ | |
1340 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1341 | extern const char *__bdevname(dev_t, char *buffer); | |
1342 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
1343 | extern struct block_device *lookup_bdev(const char *); | |
1344 | extern struct block_device *open_bdev_excl(const char *, int, void *); | |
1345 | extern void close_bdev_excl(struct block_device *); | |
1346 | ||
1347 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
1348 | ||
1349 | /* Invalid inode operations -- fs/bad_inode.c */ | |
1350 | extern void make_bad_inode(struct inode *); | |
1351 | extern int is_bad_inode(struct inode *); | |
1352 | ||
1353 | extern struct file_operations read_fifo_fops; | |
1354 | extern struct file_operations write_fifo_fops; | |
1355 | extern struct file_operations rdwr_fifo_fops; | |
1356 | extern struct file_operations read_pipe_fops; | |
1357 | extern struct file_operations write_pipe_fops; | |
1358 | extern struct file_operations rdwr_pipe_fops; | |
1359 | ||
1360 | extern int fs_may_remount_ro(struct super_block *); | |
1361 | ||
1362 | /* | |
1363 | * return READ, READA, or WRITE | |
1364 | */ | |
1365 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) | |
1366 | ||
1367 | /* | |
1368 | * return data direction, READ or WRITE | |
1369 | */ | |
1370 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) | |
1371 | ||
1372 | extern int check_disk_change(struct block_device *); | |
1373 | extern int invalidate_inodes(struct super_block *); | |
2ef41634 | 1374 | extern int __invalidate_device(struct block_device *); |
1da177e4 LT |
1375 | extern int invalidate_partition(struct gendisk *, int); |
1376 | unsigned long invalidate_mapping_pages(struct address_space *mapping, | |
1377 | pgoff_t start, pgoff_t end); | |
1378 | unsigned long invalidate_inode_pages(struct address_space *mapping); | |
1379 | static inline void invalidate_remote_inode(struct inode *inode) | |
1380 | { | |
1381 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
1382 | S_ISLNK(inode->i_mode)) | |
1383 | invalidate_inode_pages(inode->i_mapping); | |
1384 | } | |
1385 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
1386 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
1387 | pgoff_t start, pgoff_t end); | |
1388 | extern int write_inode_now(struct inode *, int); | |
1389 | extern int filemap_fdatawrite(struct address_space *); | |
1390 | extern int filemap_flush(struct address_space *); | |
1391 | extern int filemap_fdatawait(struct address_space *); | |
1392 | extern int filemap_write_and_wait(struct address_space *mapping); | |
1393 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
1394 | loff_t lstart, loff_t lend); | |
1395 | extern void sync_supers(void); | |
1396 | extern void sync_filesystems(int wait); | |
1397 | extern void emergency_sync(void); | |
1398 | extern void emergency_remount(void); | |
1399 | extern int do_remount_sb(struct super_block *sb, int flags, | |
1400 | void *data, int force); | |
1401 | extern sector_t bmap(struct inode *, sector_t); | |
1da177e4 LT |
1402 | extern int notify_change(struct dentry *, struct iattr *); |
1403 | extern int permission(struct inode *, int, struct nameidata *); | |
1404 | extern int generic_permission(struct inode *, int, | |
1405 | int (*check_acl)(struct inode *, int)); | |
1406 | ||
1407 | extern int get_write_access(struct inode *); | |
1408 | extern int deny_write_access(struct file *); | |
1409 | static inline void put_write_access(struct inode * inode) | |
1410 | { | |
1411 | atomic_dec(&inode->i_writecount); | |
1412 | } | |
1413 | static inline void allow_write_access(struct file *file) | |
1414 | { | |
1415 | if (file) | |
1416 | atomic_inc(&file->f_dentry->d_inode->i_writecount); | |
1417 | } | |
1418 | extern int do_pipe(int *); | |
1419 | ||
1420 | extern int open_namei(const char *, int, int, struct nameidata *); | |
1421 | extern int may_open(struct nameidata *, int, int); | |
1422 | ||
1423 | extern int kernel_read(struct file *, unsigned long, char *, unsigned long); | |
1424 | extern struct file * open_exec(const char *); | |
1425 | ||
1426 | /* fs/dcache.c -- generic fs support functions */ | |
1427 | extern int is_subdir(struct dentry *, struct dentry *); | |
1428 | extern ino_t find_inode_number(struct dentry *, struct qstr *); | |
1429 | ||
1430 | #include <linux/err.h> | |
1431 | ||
1432 | /* needed for stackable file system support */ | |
1433 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); | |
1434 | ||
1435 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); | |
1436 | ||
1437 | extern void inode_init_once(struct inode *); | |
1438 | extern void iput(struct inode *); | |
1439 | extern struct inode * igrab(struct inode *); | |
1440 | extern ino_t iunique(struct super_block *, ino_t); | |
1441 | extern int inode_needs_sync(struct inode *inode); | |
1442 | extern void generic_delete_inode(struct inode *inode); | |
cb2c0233 | 1443 | extern void generic_drop_inode(struct inode *inode); |
1da177e4 | 1444 | |
88bd5121 AA |
1445 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
1446 | unsigned long hashval, int (*test)(struct inode *, void *), | |
1447 | void *data); | |
1da177e4 LT |
1448 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
1449 | int (*test)(struct inode *, void *), void *data); | |
1450 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
1451 | ||
1452 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
1453 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
1454 | extern void unlock_new_inode(struct inode *); | |
1455 | ||
1456 | static inline struct inode *iget(struct super_block *sb, unsigned long ino) | |
1457 | { | |
1458 | struct inode *inode = iget_locked(sb, ino); | |
1459 | ||
1460 | if (inode && (inode->i_state & I_NEW)) { | |
1461 | sb->s_op->read_inode(inode); | |
1462 | unlock_new_inode(inode); | |
1463 | } | |
1464 | ||
1465 | return inode; | |
1466 | } | |
1467 | ||
1468 | extern void __iget(struct inode * inode); | |
1469 | extern void clear_inode(struct inode *); | |
1470 | extern void destroy_inode(struct inode *); | |
1471 | extern struct inode *new_inode(struct super_block *); | |
1472 | extern int remove_suid(struct dentry *); | |
1473 | extern void remove_dquot_ref(struct super_block *, int, struct list_head *); | |
1474 | extern struct semaphore iprune_sem; | |
1475 | ||
1476 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
1477 | extern void remove_inode_hash(struct inode *); | |
1478 | static inline void insert_inode_hash(struct inode *inode) { | |
1479 | __insert_inode_hash(inode, inode->i_ino); | |
1480 | } | |
1481 | ||
1482 | extern struct file * get_empty_filp(void); | |
1483 | extern void file_move(struct file *f, struct list_head *list); | |
1484 | extern void file_kill(struct file *f); | |
1485 | struct bio; | |
1486 | extern void submit_bio(int, struct bio *); | |
1487 | extern int bdev_read_only(struct block_device *); | |
1488 | extern int set_blocksize(struct block_device *, int); | |
1489 | extern int sb_set_blocksize(struct super_block *, int); | |
1490 | extern int sb_min_blocksize(struct super_block *, int); | |
1491 | ||
1492 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
1493 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
1494 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1495 | extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1496 | extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *); | |
1497 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); | |
1498 | extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *); | |
1499 | extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t); | |
1500 | extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *); | |
1501 | extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t); | |
1502 | extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, | |
1503 | unsigned long, loff_t *); | |
1504 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, | |
1505 | unsigned long *, loff_t, loff_t *, size_t, size_t); | |
1506 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, | |
1507 | unsigned long, loff_t, loff_t *, size_t, ssize_t); | |
1508 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); | |
1509 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); | |
1510 | ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, | |
1511 | unsigned long nr_segs, loff_t *ppos); | |
1512 | extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); | |
1513 | extern void do_generic_mapping_read(struct address_space *mapping, | |
1514 | struct file_ra_state *, struct file *, | |
1515 | loff_t *, read_descriptor_t *, read_actor_t); | |
1516 | extern void | |
1517 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
1da177e4 LT |
1518 | extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, |
1519 | unsigned long nr_segs, loff_t *ppos); | |
1520 | ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, | |
1521 | unsigned long nr_segs, loff_t *ppos); | |
1522 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); | |
1523 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); | |
1524 | extern loff_t remote_llseek(struct file *file, loff_t offset, int origin); | |
1525 | extern int generic_file_open(struct inode * inode, struct file * filp); | |
1526 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
1527 | ||
ceffc078 | 1528 | #ifdef CONFIG_FS_XIP |
eb6fe0c3 CO |
1529 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
1530 | loff_t *ppos); | |
ceffc078 CO |
1531 | extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos, |
1532 | size_t count, read_actor_t actor, | |
1533 | void *target); | |
1534 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); | |
eb6fe0c3 CO |
1535 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
1536 | size_t len, loff_t *ppos); | |
ceffc078 | 1537 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
6d79125b CO |
1538 | #else |
1539 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) | |
1540 | { | |
1541 | return 0; | |
1542 | } | |
ceffc078 CO |
1543 | #endif |
1544 | ||
1da177e4 LT |
1545 | static inline void do_generic_file_read(struct file * filp, loff_t *ppos, |
1546 | read_descriptor_t * desc, | |
1547 | read_actor_t actor) | |
1548 | { | |
1549 | do_generic_mapping_read(filp->f_mapping, | |
1550 | &filp->f_ra, | |
1551 | filp, | |
1552 | ppos, | |
1553 | desc, | |
1554 | actor); | |
1555 | } | |
1556 | ||
1557 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, | |
1558 | struct block_device *bdev, const struct iovec *iov, loff_t offset, | |
1559 | unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io, | |
1560 | int lock_type); | |
1561 | ||
1562 | enum { | |
1563 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ | |
1564 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ | |
1565 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ | |
1566 | }; | |
1567 | ||
1568 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, | |
1569 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1570 | loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, | |
1571 | dio_iodone_t end_io) | |
1572 | { | |
1573 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1574 | nr_segs, get_blocks, end_io, DIO_LOCKING); | |
1575 | } | |
1576 | ||
1577 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, | |
1578 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1579 | loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, | |
1580 | dio_iodone_t end_io) | |
1581 | { | |
1582 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1583 | nr_segs, get_blocks, end_io, DIO_NO_LOCKING); | |
1584 | } | |
1585 | ||
1586 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, | |
1587 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1588 | loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks, | |
1589 | dio_iodone_t end_io) | |
1590 | { | |
1591 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1592 | nr_segs, get_blocks, end_io, DIO_OWN_LOCKING); | |
1593 | } | |
1594 | ||
1595 | extern struct file_operations generic_ro_fops; | |
1596 | ||
1597 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
1598 | ||
1599 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); | |
1600 | extern int vfs_follow_link(struct nameidata *, const char *); | |
1601 | extern int page_readlink(struct dentry *, char __user *, int); | |
cc314eef LT |
1602 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
1603 | extern void page_put_link(struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
1604 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
1605 | extern struct inode_operations page_symlink_inode_operations; | |
1606 | extern int generic_readlink(struct dentry *, char __user *, int); | |
1607 | extern void generic_fillattr(struct inode *, struct kstat *); | |
1608 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
1609 | void inode_add_bytes(struct inode *inode, loff_t bytes); | |
1610 | void inode_sub_bytes(struct inode *inode, loff_t bytes); | |
1611 | loff_t inode_get_bytes(struct inode *inode); | |
1612 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
1613 | ||
1614 | extern int vfs_readdir(struct file *, filldir_t, void *); | |
1615 | ||
1616 | extern int vfs_stat(char __user *, struct kstat *); | |
1617 | extern int vfs_lstat(char __user *, struct kstat *); | |
1618 | extern int vfs_fstat(unsigned int, struct kstat *); | |
1619 | ||
1620 | extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); | |
1621 | ||
1622 | extern struct file_system_type *get_fs_type(const char *name); | |
1623 | extern struct super_block *get_super(struct block_device *); | |
1624 | extern struct super_block *user_get_super(dev_t); | |
1625 | extern void drop_super(struct super_block *sb); | |
1626 | ||
1627 | extern int dcache_dir_open(struct inode *, struct file *); | |
1628 | extern int dcache_dir_close(struct inode *, struct file *); | |
1629 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
1630 | extern int dcache_readdir(struct file *, void *, filldir_t); | |
1631 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
1632 | extern int simple_statfs(struct super_block *, struct kstatfs *); | |
1633 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); | |
1634 | extern int simple_unlink(struct inode *, struct dentry *); | |
1635 | extern int simple_rmdir(struct inode *, struct dentry *); | |
1636 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1637 | extern int simple_sync_file(struct file *, struct dentry *, int); | |
1638 | extern int simple_empty(struct dentry *); | |
1639 | extern int simple_readpage(struct file *file, struct page *page); | |
1640 | extern int simple_prepare_write(struct file *file, struct page *page, | |
1641 | unsigned offset, unsigned to); | |
1642 | extern int simple_commit_write(struct file *file, struct page *page, | |
1643 | unsigned offset, unsigned to); | |
1644 | ||
1645 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); | |
1646 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); | |
1647 | extern struct file_operations simple_dir_operations; | |
1648 | extern struct inode_operations simple_dir_inode_operations; | |
1649 | struct tree_descr { char *name; struct file_operations *ops; int mode; }; | |
1650 | struct dentry *d_alloc_name(struct dentry *, const char *); | |
1651 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); | |
1652 | extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count); | |
1653 | extern void simple_release_fs(struct vfsmount **mount, int *count); | |
1654 | ||
1655 | extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); | |
1656 | ||
1657 | extern int inode_change_ok(struct inode *, struct iattr *); | |
1658 | extern int __must_check inode_setattr(struct inode *, struct iattr *); | |
1659 | ||
1660 | extern void inode_update_time(struct inode *inode, int ctime_too); | |
1661 | ||
1662 | static inline ino_t parent_ino(struct dentry *dentry) | |
1663 | { | |
1664 | ino_t res; | |
1665 | ||
1666 | spin_lock(&dentry->d_lock); | |
1667 | res = dentry->d_parent->d_inode->i_ino; | |
1668 | spin_unlock(&dentry->d_lock); | |
1669 | return res; | |
1670 | } | |
1671 | ||
1672 | /* kernel/fork.c */ | |
1673 | extern int unshare_files(void); | |
1674 | ||
1675 | /* Transaction based IO helpers */ | |
1676 | ||
1677 | /* | |
1678 | * An argresp is stored in an allocated page and holds the | |
1679 | * size of the argument or response, along with its content | |
1680 | */ | |
1681 | struct simple_transaction_argresp { | |
1682 | ssize_t size; | |
1683 | char data[0]; | |
1684 | }; | |
1685 | ||
1686 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
1687 | ||
1688 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
1689 | size_t size); | |
1690 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
1691 | size_t size, loff_t *pos); | |
1692 | int simple_transaction_release(struct inode *inode, struct file *file); | |
1693 | ||
1694 | static inline void simple_transaction_set(struct file *file, size_t n) | |
1695 | { | |
1696 | struct simple_transaction_argresp *ar = file->private_data; | |
1697 | ||
1698 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); | |
1699 | ||
1700 | /* | |
1701 | * The barrier ensures that ar->size will really remain zero until | |
1702 | * ar->data is ready for reading. | |
1703 | */ | |
1704 | smp_mb(); | |
1705 | ar->size = n; | |
1706 | } | |
1707 | ||
acaefc25 AB |
1708 | /* |
1709 | * simple attribute files | |
1710 | * | |
1711 | * These attributes behave similar to those in sysfs: | |
1712 | * | |
1713 | * Writing to an attribute immediately sets a value, an open file can be | |
1714 | * written to multiple times. | |
1715 | * | |
1716 | * Reading from an attribute creates a buffer from the value that might get | |
1717 | * read with multiple read calls. When the attribute has been read | |
1718 | * completely, no further read calls are possible until the file is opened | |
1719 | * again. | |
1720 | * | |
1721 | * All attributes contain a text representation of a numeric value | |
1722 | * that are accessed with the get() and set() functions. | |
1723 | */ | |
1724 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
1725 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
1726 | { \ | |
1727 | __simple_attr_check_format(__fmt, 0ull); \ | |
1728 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
1729 | } \ | |
1730 | static struct file_operations __fops = { \ | |
1731 | .owner = THIS_MODULE, \ | |
1732 | .open = __fops ## _open, \ | |
1733 | .release = simple_attr_close, \ | |
1734 | .read = simple_attr_read, \ | |
1735 | .write = simple_attr_write, \ | |
1736 | }; | |
1737 | ||
1738 | static inline void __attribute__((format(printf, 1, 2))) | |
1739 | __simple_attr_check_format(const char *fmt, ...) | |
1740 | { | |
1741 | /* don't do anything, just let the compiler check the arguments; */ | |
1742 | } | |
1743 | ||
1744 | int simple_attr_open(struct inode *inode, struct file *file, | |
1745 | u64 (*get)(void *), void (*set)(void *, u64), | |
1746 | const char *fmt); | |
1747 | int simple_attr_close(struct inode *inode, struct file *file); | |
1748 | ssize_t simple_attr_read(struct file *file, char __user *buf, | |
1749 | size_t len, loff_t *ppos); | |
1750 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
1751 | size_t len, loff_t *ppos); | |
1752 | ||
1753 | ||
1da177e4 LT |
1754 | #ifdef CONFIG_SECURITY |
1755 | static inline char *alloc_secdata(void) | |
1756 | { | |
1757 | return (char *)get_zeroed_page(GFP_KERNEL); | |
1758 | } | |
1759 | ||
1760 | static inline void free_secdata(void *secdata) | |
1761 | { | |
1762 | free_page((unsigned long)secdata); | |
1763 | } | |
1764 | #else | |
1765 | static inline char *alloc_secdata(void) | |
1766 | { | |
1767 | return (char *)1; | |
1768 | } | |
1769 | ||
1770 | static inline void free_secdata(void *secdata) | |
1771 | { } | |
1772 | #endif /* CONFIG_SECURITY */ | |
1773 | ||
1774 | #endif /* __KERNEL__ */ | |
1775 | #endif /* _LINUX_FS_H */ |