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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> | |
12 | ||
13 | /* | |
14 | * It's silly to have NR_OPEN bigger than NR_FILE, but you can change | |
15 | * the file limit at runtime and only root can increase the per-process | |
16 | * nr_file rlimit, so it's safe to set up a ridiculously high absolute | |
17 | * upper limit on files-per-process. | |
18 | * | |
19 | * Some programs (notably those using select()) may have to be | |
20 | * recompiled to take full advantage of the new limits.. | |
21 | */ | |
22 | ||
23 | /* Fixed constants first: */ | |
24 | #undef NR_OPEN | |
25 | #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */ | |
26 | #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ | |
27 | ||
28 | #define BLOCK_SIZE_BITS 10 | |
29 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) | |
30 | ||
31 | /* And dynamically-tunable limits and defaults: */ | |
32 | struct files_stat_struct { | |
33 | int nr_files; /* read only */ | |
34 | int nr_free_files; /* read only */ | |
35 | int max_files; /* tunable */ | |
36 | }; | |
37 | extern struct files_stat_struct files_stat; | |
529bf6be | 38 | extern int get_max_files(void); |
1da177e4 LT |
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 | ||
b500531e OD |
68 | /* File is being opened for execution. Primary users of this flag are |
69 | distributed filesystems that can use it to achieve correct ETXTBUSY | |
70 | behavior for cross-node execution/opening_for_writing of files */ | |
71 | #define FMODE_EXEC 16 | |
72 | ||
1da177e4 LT |
73 | #define RW_MASK 1 |
74 | #define RWA_MASK 2 | |
75 | #define READ 0 | |
76 | #define WRITE 1 | |
77 | #define READA 2 /* read-ahead - don't block if no resources */ | |
a7662236 | 78 | #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
1da177e4 LT |
79 | #define SPECIAL 4 /* For non-blockdevice requests in request queue */ |
80 | #define READ_SYNC (READ | (1 << BIO_RW_SYNC)) | |
81 | #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) | |
82 | #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) | |
83 | ||
84 | #define SEL_IN 1 | |
85 | #define SEL_OUT 2 | |
86 | #define SEL_EX 4 | |
87 | ||
88 | /* public flags for file_system_type */ | |
89 | #define FS_REQUIRES_DEV 1 | |
90 | #define FS_BINARY_MOUNTDATA 2 | |
91 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ | |
92 | #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon | |
93 | * as nfs_rename() will be cleaned up | |
94 | */ | |
95 | /* | |
96 | * These are the fs-independent mount-flags: up to 32 flags are supported | |
97 | */ | |
98 | #define MS_RDONLY 1 /* Mount read-only */ | |
99 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |
100 | #define MS_NODEV 4 /* Disallow access to device special files */ | |
101 | #define MS_NOEXEC 8 /* Disallow program execution */ | |
102 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ | |
103 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ | |
104 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
105 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ | |
106 | #define MS_NOATIME 1024 /* Do not update access times. */ | |
107 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ | |
108 | #define MS_BIND 4096 | |
109 | #define MS_MOVE 8192 | |
110 | #define MS_REC 16384 | |
9b04c997 TT |
111 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
112 | MS_VERBOSE is deprecated. */ | |
113 | #define MS_SILENT 32768 | |
bf066c7d | 114 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
9676f0c6 | 115 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
07b20889 | 116 | #define MS_PRIVATE (1<<18) /* change to private */ |
a58b0eb8 | 117 | #define MS_SLAVE (1<<19) /* change to slave */ |
03e06e68 | 118 | #define MS_SHARED (1<<20) /* change to shared */ |
1da177e4 LT |
119 | #define MS_ACTIVE (1<<30) |
120 | #define MS_NOUSER (1<<31) | |
121 | ||
122 | /* | |
123 | * Superblock flags that can be altered by MS_REMOUNT | |
124 | */ | |
fc33a7bb | 125 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK) |
1da177e4 LT |
126 | |
127 | /* | |
128 | * Old magic mount flag and mask | |
129 | */ | |
130 | #define MS_MGC_VAL 0xC0ED0000 | |
131 | #define MS_MGC_MSK 0xffff0000 | |
132 | ||
133 | /* Inode flags - they have nothing to superblock flags now */ | |
134 | ||
135 | #define S_SYNC 1 /* Writes are synced at once */ | |
136 | #define S_NOATIME 2 /* Do not update access times */ | |
137 | #define S_APPEND 4 /* Append-only file */ | |
138 | #define S_IMMUTABLE 8 /* Immutable file */ | |
139 | #define S_DEAD 16 /* removed, but still open directory */ | |
140 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
141 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
142 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
143 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
144 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
145 | ||
146 | /* | |
147 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
148 | * flags just means all the inodes inherit those flags by default. It might be | |
149 | * possible to override it selectively if you really wanted to with some | |
150 | * ioctl() that is not currently implemented. | |
151 | * | |
152 | * Exception: MS_RDONLY is always applied to the entire file system. | |
153 | * | |
154 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
155 | * with files in use. This means that all of the inodes will not have their | |
156 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
157 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
158 | */ | |
159 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) | |
160 | ||
161 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
162 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
163 | ((inode)->i_flags & S_SYNC)) | |
164 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
165 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
166 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
167 | ||
168 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
169 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
170 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
171 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
172 | ||
173 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
174 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
175 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
176 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
177 | ||
178 | /* the read-only stuff doesn't really belong here, but any other place is | |
179 | probably as bad and I don't want to create yet another include file. */ | |
180 | ||
181 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ | |
182 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ | |
183 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ | |
184 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ | |
185 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ | |
186 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ | |
187 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ | |
188 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ | |
189 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ | |
190 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ | |
191 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ | |
192 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ | |
193 | #if 0 | |
194 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ | |
195 | ||
196 | /* Some people are morons. Do not use sizeof! */ | |
197 | ||
198 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ | |
199 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ | |
200 | /* This was here just to show that the number is taken - | |
201 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ | |
202 | #endif | |
203 | /* A jump here: 108-111 have been used for various private purposes. */ | |
204 | #define BLKBSZGET _IOR(0x12,112,size_t) | |
205 | #define BLKBSZSET _IOW(0x12,113,size_t) | |
206 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
2056a782 JA |
207 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
208 | #define BLKTRACESTART _IO(0x12,116) | |
209 | #define BLKTRACESTOP _IO(0x12,117) | |
210 | #define BLKTRACETEARDOWN _IO(0x12,118) | |
1da177e4 LT |
211 | |
212 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ | |
213 | #define FIBMAP _IO(0x00,1) /* bmap access */ | |
214 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ | |
215 | ||
216 | #ifdef __KERNEL__ | |
217 | ||
218 | #include <linux/linkage.h> | |
219 | #include <linux/wait.h> | |
220 | #include <linux/types.h> | |
221 | #include <linux/kdev_t.h> | |
222 | #include <linux/dcache.h> | |
223 | #include <linux/stat.h> | |
224 | #include <linux/cache.h> | |
225 | #include <linux/kobject.h> | |
226 | #include <linux/list.h> | |
227 | #include <linux/radix-tree.h> | |
228 | #include <linux/prio_tree.h> | |
229 | #include <linux/init.h> | |
22e2c507 | 230 | #include <linux/sched.h> |
1b1dcc1b | 231 | #include <linux/mutex.h> |
1da177e4 LT |
232 | |
233 | #include <asm/atomic.h> | |
234 | #include <asm/semaphore.h> | |
235 | #include <asm/byteorder.h> | |
236 | ||
a885c8c4 | 237 | struct hd_geometry; |
1da177e4 LT |
238 | struct iovec; |
239 | struct nameidata; | |
92198f7e | 240 | struct kiocb; |
1da177e4 LT |
241 | struct pipe_inode_info; |
242 | struct poll_table_struct; | |
243 | struct kstatfs; | |
244 | struct vm_area_struct; | |
245 | struct vfsmount; | |
246 | ||
1da177e4 LT |
247 | extern void __init inode_init(unsigned long); |
248 | extern void __init inode_init_early(void); | |
249 | extern void __init mnt_init(unsigned long); | |
250 | extern void __init files_init(unsigned long); | |
251 | ||
252 | struct buffer_head; | |
253 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
254 | struct buffer_head *bh_result, int create); | |
92198f7e | 255 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
1da177e4 LT |
256 | ssize_t bytes, void *private); |
257 | ||
258 | /* | |
259 | * Attribute flags. These should be or-ed together to figure out what | |
260 | * has been changed! | |
261 | */ | |
262 | #define ATTR_MODE 1 | |
263 | #define ATTR_UID 2 | |
264 | #define ATTR_GID 4 | |
265 | #define ATTR_SIZE 8 | |
266 | #define ATTR_ATIME 16 | |
267 | #define ATTR_MTIME 32 | |
268 | #define ATTR_CTIME 64 | |
269 | #define ATTR_ATIME_SET 128 | |
270 | #define ATTR_MTIME_SET 256 | |
271 | #define ATTR_FORCE 512 /* Not a change, but a change it */ | |
272 | #define ATTR_ATTR_FLAG 1024 | |
273 | #define ATTR_KILL_SUID 2048 | |
274 | #define ATTR_KILL_SGID 4096 | |
cc4e69de | 275 | #define ATTR_FILE 8192 |
1da177e4 LT |
276 | |
277 | /* | |
278 | * This is the Inode Attributes structure, used for notify_change(). It | |
279 | * uses the above definitions as flags, to know which values have changed. | |
280 | * Also, in this manner, a Filesystem can look at only the values it cares | |
281 | * about. Basically, these are the attributes that the VFS layer can | |
282 | * request to change from the FS layer. | |
283 | * | |
284 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
285 | */ | |
286 | struct iattr { | |
287 | unsigned int ia_valid; | |
288 | umode_t ia_mode; | |
289 | uid_t ia_uid; | |
290 | gid_t ia_gid; | |
291 | loff_t ia_size; | |
292 | struct timespec ia_atime; | |
293 | struct timespec ia_mtime; | |
294 | struct timespec ia_ctime; | |
cc4e69de MS |
295 | |
296 | /* | |
297 | * Not an attribute, but an auxilary info for filesystems wanting to | |
298 | * implement an ftruncate() like method. NOTE: filesystem should | |
299 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
300 | */ | |
301 | struct file *ia_file; | |
1da177e4 LT |
302 | }; |
303 | ||
1da177e4 LT |
304 | /* |
305 | * Includes for diskquotas. | |
306 | */ | |
307 | #include <linux/quota.h> | |
308 | ||
994fc28c ZB |
309 | /** |
310 | * enum positive_aop_returns - aop return codes with specific semantics | |
311 | * | |
312 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
313 | * completed, that the page is still locked, and | |
314 | * should be considered active. The VM uses this hint | |
315 | * to return the page to the active list -- it won't | |
316 | * be a candidate for writeback again in the near | |
317 | * future. Other callers must be careful to unlock | |
318 | * the page if they get this return. Returned by | |
319 | * writepage(); | |
320 | * | |
321 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
322 | * unlocked it and the page might have been truncated. | |
323 | * The caller should back up to acquiring a new page and | |
324 | * trying again. The aop will be taking reasonable | |
325 | * precautions not to livelock. If the caller held a page | |
326 | * reference, it should drop it before retrying. Returned | |
327 | * by readpage(), prepare_write(), and commit_write(). | |
328 | * | |
329 | * address_space_operation functions return these large constants to indicate | |
330 | * special semantics to the caller. These are much larger than the bytes in a | |
331 | * page to allow for functions that return the number of bytes operated on in a | |
332 | * given page. | |
333 | */ | |
334 | ||
335 | enum positive_aop_returns { | |
336 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
337 | AOP_TRUNCATED_PAGE = 0x80001, | |
338 | }; | |
339 | ||
1da177e4 LT |
340 | /* |
341 | * oh the beauties of C type declarations. | |
342 | */ | |
343 | struct page; | |
344 | struct address_space; | |
345 | struct writeback_control; | |
1da177e4 LT |
346 | |
347 | struct address_space_operations { | |
348 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
349 | int (*readpage)(struct file *, struct page *); | |
3978d717 | 350 | void (*sync_page)(struct page *); |
1da177e4 LT |
351 | |
352 | /* Write back some dirty pages from this mapping. */ | |
353 | int (*writepages)(struct address_space *, struct writeback_control *); | |
354 | ||
4741c9fd | 355 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
356 | int (*set_page_dirty)(struct page *page); |
357 | ||
358 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
359 | struct list_head *pages, unsigned nr_pages); | |
360 | ||
361 | /* | |
362 | * ext3 requires that a successful prepare_write() call be followed | |
363 | * by a commit_write() call - they must be balanced | |
364 | */ | |
365 | int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); | |
366 | int (*commit_write)(struct file *, struct page *, unsigned, unsigned); | |
367 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ | |
368 | sector_t (*bmap)(struct address_space *, sector_t); | |
2ff28e22 | 369 | void (*invalidatepage) (struct page *, unsigned long); |
27496a8c | 370 | int (*releasepage) (struct page *, gfp_t); |
1da177e4 LT |
371 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
372 | loff_t offset, unsigned long nr_segs); | |
ceffc078 CO |
373 | struct page* (*get_xip_page)(struct address_space *, sector_t, |
374 | int); | |
e965f963 CL |
375 | /* migrate the contents of a page to the specified target */ |
376 | int (*migratepage) (struct page *, struct page *); | |
1da177e4 LT |
377 | }; |
378 | ||
379 | struct backing_dev_info; | |
380 | struct address_space { | |
381 | struct inode *host; /* owner: inode, block_device */ | |
382 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
383 | rwlock_t tree_lock; /* and rwlock protecting it */ | |
384 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ | |
385 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ | |
386 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ | |
387 | spinlock_t i_mmap_lock; /* protect tree, count, list */ | |
388 | unsigned int truncate_count; /* Cover race condition with truncate */ | |
389 | unsigned long nrpages; /* number of total pages */ | |
390 | pgoff_t writeback_index;/* writeback starts here */ | |
391 | struct address_space_operations *a_ops; /* methods */ | |
392 | unsigned long flags; /* error bits/gfp mask */ | |
393 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ | |
394 | spinlock_t private_lock; /* for use by the address_space */ | |
395 | struct list_head private_list; /* ditto */ | |
396 | struct address_space *assoc_mapping; /* ditto */ | |
397 | } __attribute__((aligned(sizeof(long)))); | |
398 | /* | |
399 | * On most architectures that alignment is already the case; but | |
400 | * must be enforced here for CRIS, to let the least signficant bit | |
401 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. | |
402 | */ | |
403 | ||
404 | struct block_device { | |
405 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
406 | struct inode * bd_inode; /* will die */ | |
407 | int bd_openers; | |
c039e313 AV |
408 | struct mutex bd_mutex; /* open/close mutex */ |
409 | struct mutex bd_mount_mutex; /* mount mutex */ | |
1da177e4 LT |
410 | struct list_head bd_inodes; |
411 | void * bd_holder; | |
412 | int bd_holders; | |
641dc636 JN |
413 | #ifdef CONFIG_SYSFS |
414 | struct list_head bd_holder_list; | |
415 | #endif | |
1da177e4 LT |
416 | struct block_device * bd_contains; |
417 | unsigned bd_block_size; | |
418 | struct hd_struct * bd_part; | |
419 | /* number of times partitions within this device have been opened. */ | |
420 | unsigned bd_part_count; | |
421 | int bd_invalidated; | |
422 | struct gendisk * bd_disk; | |
423 | struct list_head bd_list; | |
424 | struct backing_dev_info *bd_inode_backing_dev_info; | |
425 | /* | |
426 | * Private data. You must have bd_claim'ed the block_device | |
427 | * to use this. NOTE: bd_claim allows an owner to claim | |
428 | * the same device multiple times, the owner must take special | |
429 | * care to not mess up bd_private for that case. | |
430 | */ | |
431 | unsigned long bd_private; | |
432 | }; | |
433 | ||
434 | /* | |
435 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
436 | * radix trees | |
437 | */ | |
438 | #define PAGECACHE_TAG_DIRTY 0 | |
439 | #define PAGECACHE_TAG_WRITEBACK 1 | |
440 | ||
441 | int mapping_tagged(struct address_space *mapping, int tag); | |
442 | ||
443 | /* | |
444 | * Might pages of this file be mapped into userspace? | |
445 | */ | |
446 | static inline int mapping_mapped(struct address_space *mapping) | |
447 | { | |
448 | return !prio_tree_empty(&mapping->i_mmap) || | |
449 | !list_empty(&mapping->i_mmap_nonlinear); | |
450 | } | |
451 | ||
452 | /* | |
453 | * Might pages of this file have been modified in userspace? | |
454 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
455 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
456 | * writing i.e. vma may be mprotected writable even if now readonly. | |
457 | */ | |
458 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
459 | { | |
460 | return mapping->i_mmap_writable != 0; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
465 | */ | |
466 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
467 | #include <linux/seqlock.h> | |
468 | #define __NEED_I_SIZE_ORDERED | |
469 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
470 | #else | |
471 | #define i_size_ordered_init(inode) do { } while (0) | |
472 | #endif | |
473 | ||
474 | struct inode { | |
475 | struct hlist_node i_hash; | |
476 | struct list_head i_list; | |
477 | struct list_head i_sb_list; | |
478 | struct list_head i_dentry; | |
479 | unsigned long i_ino; | |
480 | atomic_t i_count; | |
481 | umode_t i_mode; | |
482 | unsigned int i_nlink; | |
483 | uid_t i_uid; | |
484 | gid_t i_gid; | |
485 | dev_t i_rdev; | |
486 | loff_t i_size; | |
487 | struct timespec i_atime; | |
488 | struct timespec i_mtime; | |
489 | struct timespec i_ctime; | |
490 | unsigned int i_blkbits; | |
491 | unsigned long i_blksize; | |
492 | unsigned long i_version; | |
a0f62ac6 | 493 | blkcnt_t i_blocks; |
1da177e4 LT |
494 | unsigned short i_bytes; |
495 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ | |
1b1dcc1b | 496 | struct mutex i_mutex; |
1da177e4 LT |
497 | struct rw_semaphore i_alloc_sem; |
498 | struct inode_operations *i_op; | |
99ac48f5 | 499 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
1da177e4 LT |
500 | struct super_block *i_sb; |
501 | struct file_lock *i_flock; | |
502 | struct address_space *i_mapping; | |
503 | struct address_space i_data; | |
504 | #ifdef CONFIG_QUOTA | |
505 | struct dquot *i_dquot[MAXQUOTAS]; | |
506 | #endif | |
507 | /* These three should probably be a union */ | |
508 | struct list_head i_devices; | |
509 | struct pipe_inode_info *i_pipe; | |
510 | struct block_device *i_bdev; | |
511 | struct cdev *i_cdev; | |
512 | int i_cindex; | |
513 | ||
514 | __u32 i_generation; | |
515 | ||
516 | #ifdef CONFIG_DNOTIFY | |
517 | unsigned long i_dnotify_mask; /* Directory notify events */ | |
518 | struct dnotify_struct *i_dnotify; /* for directory notifications */ | |
519 | #endif | |
520 | ||
0eeca283 RL |
521 | #ifdef CONFIG_INOTIFY |
522 | struct list_head inotify_watches; /* watches on this inode */ | |
d4f9af9d | 523 | struct mutex inotify_mutex; /* protects the watches list */ |
0eeca283 RL |
524 | #endif |
525 | ||
1da177e4 LT |
526 | unsigned long i_state; |
527 | unsigned long dirtied_when; /* jiffies of first dirtying */ | |
528 | ||
529 | unsigned int i_flags; | |
530 | ||
531 | atomic_t i_writecount; | |
532 | void *i_security; | |
533 | union { | |
534 | void *generic_ip; | |
535 | } u; | |
536 | #ifdef __NEED_I_SIZE_ORDERED | |
537 | seqcount_t i_size_seqcount; | |
538 | #endif | |
539 | }; | |
540 | ||
541 | /* | |
542 | * NOTE: in a 32bit arch with a preemptable kernel and | |
543 | * an UP compile the i_size_read/write must be atomic | |
544 | * with respect to the local cpu (unlike with preempt disabled), | |
545 | * but they don't need to be atomic with respect to other cpus like in | |
546 | * true SMP (so they need either to either locally disable irq around | |
547 | * the read or for example on x86 they can be still implemented as a | |
548 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
549 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
550 | */ | |
551 | static inline loff_t i_size_read(struct inode *inode) | |
552 | { | |
553 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
554 | loff_t i_size; | |
555 | unsigned int seq; | |
556 | ||
557 | do { | |
558 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
559 | i_size = inode->i_size; | |
560 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
561 | return i_size; | |
562 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
563 | loff_t i_size; | |
564 | ||
565 | preempt_disable(); | |
566 | i_size = inode->i_size; | |
567 | preempt_enable(); | |
568 | return i_size; | |
569 | #else | |
570 | return inode->i_size; | |
571 | #endif | |
572 | } | |
573 | ||
574 | ||
575 | static inline void i_size_write(struct inode *inode, loff_t i_size) | |
576 | { | |
577 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
578 | write_seqcount_begin(&inode->i_size_seqcount); | |
579 | inode->i_size = i_size; | |
580 | write_seqcount_end(&inode->i_size_seqcount); | |
581 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
582 | preempt_disable(); | |
583 | inode->i_size = i_size; | |
584 | preempt_enable(); | |
585 | #else | |
586 | inode->i_size = i_size; | |
587 | #endif | |
588 | } | |
589 | ||
590 | static inline unsigned iminor(struct inode *inode) | |
591 | { | |
592 | return MINOR(inode->i_rdev); | |
593 | } | |
594 | ||
595 | static inline unsigned imajor(struct inode *inode) | |
596 | { | |
597 | return MAJOR(inode->i_rdev); | |
598 | } | |
599 | ||
600 | extern struct block_device *I_BDEV(struct inode *inode); | |
601 | ||
602 | struct fown_struct { | |
603 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
604 | int pid; /* pid or -pgrp where SIGIO should be sent */ | |
605 | uid_t uid, euid; /* uid/euid of process setting the owner */ | |
606 | void *security; | |
607 | int signum; /* posix.1b rt signal to be delivered on IO */ | |
608 | }; | |
609 | ||
610 | /* | |
611 | * Track a single file's readahead state | |
612 | */ | |
613 | struct file_ra_state { | |
614 | unsigned long start; /* Current window */ | |
615 | unsigned long size; | |
616 | unsigned long flags; /* ra flags RA_FLAG_xxx*/ | |
617 | unsigned long cache_hit; /* cache hit count*/ | |
618 | unsigned long prev_page; /* Cache last read() position */ | |
619 | unsigned long ahead_start; /* Ahead window */ | |
620 | unsigned long ahead_size; | |
621 | unsigned long ra_pages; /* Maximum readahead window */ | |
622 | unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ | |
623 | unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ | |
624 | }; | |
625 | #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ | |
626 | #define RA_FLAG_INCACHE 0x02 /* file is already in cache */ | |
627 | ||
628 | struct file { | |
2f512016 ED |
629 | /* |
630 | * fu_list becomes invalid after file_free is called and queued via | |
631 | * fu_rcuhead for RCU freeing | |
632 | */ | |
633 | union { | |
634 | struct list_head fu_list; | |
635 | struct rcu_head fu_rcuhead; | |
636 | } f_u; | |
1da177e4 LT |
637 | struct dentry *f_dentry; |
638 | struct vfsmount *f_vfsmnt; | |
99ac48f5 | 639 | const struct file_operations *f_op; |
1da177e4 LT |
640 | atomic_t f_count; |
641 | unsigned int f_flags; | |
642 | mode_t f_mode; | |
1da177e4 LT |
643 | loff_t f_pos; |
644 | struct fown_struct f_owner; | |
645 | unsigned int f_uid, f_gid; | |
646 | struct file_ra_state f_ra; | |
647 | ||
1da177e4 LT |
648 | unsigned long f_version; |
649 | void *f_security; | |
650 | ||
651 | /* needed for tty driver, and maybe others */ | |
652 | void *private_data; | |
653 | ||
654 | #ifdef CONFIG_EPOLL | |
655 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
656 | struct list_head f_ep_links; | |
657 | spinlock_t f_ep_lock; | |
658 | #endif /* #ifdef CONFIG_EPOLL */ | |
659 | struct address_space *f_mapping; | |
660 | }; | |
661 | extern spinlock_t files_lock; | |
662 | #define file_list_lock() spin_lock(&files_lock); | |
663 | #define file_list_unlock() spin_unlock(&files_lock); | |
664 | ||
095975da | 665 | #define get_file(x) atomic_inc(&(x)->f_count) |
1da177e4 LT |
666 | #define file_count(x) atomic_read(&(x)->f_count) |
667 | ||
668 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
669 | ||
670 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
671 | limits, otherwise bad things can happen in VM. */ | |
672 | #if BITS_PER_LONG==32 | |
673 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) | |
674 | #elif BITS_PER_LONG==64 | |
675 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL | |
676 | #endif | |
677 | ||
678 | #define FL_POSIX 1 | |
679 | #define FL_FLOCK 2 | |
680 | #define FL_ACCESS 8 /* not trying to lock, just looking */ | |
1da177e4 LT |
681 | #define FL_LEASE 32 /* lease held on this file */ |
682 | #define FL_SLEEP 128 /* A blocking lock */ | |
683 | ||
684 | /* | |
685 | * The POSIX file lock owner is determined by | |
686 | * the "struct files_struct" in the thread group | |
687 | * (or NULL for no owner - BSD locks). | |
688 | * | |
689 | * Lockd stuffs a "host" pointer into this. | |
690 | */ | |
691 | typedef struct files_struct *fl_owner_t; | |
692 | ||
693 | struct file_lock_operations { | |
694 | void (*fl_insert)(struct file_lock *); /* lock insertion callback */ | |
695 | void (*fl_remove)(struct file_lock *); /* lock removal callback */ | |
696 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
697 | void (*fl_release_private)(struct file_lock *); | |
698 | }; | |
699 | ||
700 | struct lock_manager_operations { | |
701 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); | |
702 | void (*fl_notify)(struct file_lock *); /* unblock callback */ | |
703 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); | |
704 | void (*fl_release_private)(struct file_lock *); | |
705 | void (*fl_break)(struct file_lock *); | |
706 | int (*fl_mylease)(struct file_lock *, struct file_lock *); | |
707 | int (*fl_change)(struct file_lock **, int); | |
708 | }; | |
709 | ||
710 | /* that will die - we need it for nfs_lock_info */ | |
711 | #include <linux/nfs_fs_i.h> | |
712 | ||
713 | struct file_lock { | |
714 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
715 | struct list_head fl_link; /* doubly linked list of all locks */ | |
716 | struct list_head fl_block; /* circular list of blocked processes */ | |
717 | fl_owner_t fl_owner; | |
718 | unsigned int fl_pid; | |
719 | wait_queue_head_t fl_wait; | |
720 | struct file *fl_file; | |
721 | unsigned char fl_flags; | |
722 | unsigned char fl_type; | |
723 | loff_t fl_start; | |
724 | loff_t fl_end; | |
725 | ||
726 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
727 | unsigned long fl_break_time; /* for nonblocking lease breaks */ | |
728 | ||
729 | struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ | |
730 | struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ | |
731 | union { | |
732 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 733 | struct nfs4_lock_info nfs4_fl; |
1da177e4 LT |
734 | } fl_u; |
735 | }; | |
736 | ||
737 | /* The following constant reflects the upper bound of the file/locking space */ | |
738 | #ifndef OFFSET_MAX | |
739 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
740 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
741 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
742 | #endif | |
743 | ||
1da177e4 LT |
744 | #include <linux/fcntl.h> |
745 | ||
746 | extern int fcntl_getlk(struct file *, struct flock __user *); | |
c293621b PS |
747 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
748 | struct flock __user *); | |
1da177e4 LT |
749 | |
750 | #if BITS_PER_LONG == 32 | |
751 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); | |
c293621b PS |
752 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
753 | struct flock64 __user *); | |
1da177e4 LT |
754 | #endif |
755 | ||
756 | extern void send_sigio(struct fown_struct *fown, int fd, int band); | |
757 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); | |
758 | extern int fcntl_getlease(struct file *filp); | |
759 | ||
760 | /* fs/locks.c */ | |
761 | extern void locks_init_lock(struct file_lock *); | |
762 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); | |
763 | extern void locks_remove_posix(struct file *, fl_owner_t); | |
764 | extern void locks_remove_flock(struct file *); | |
8dc7c311 | 765 | extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *); |
5842add2 | 766 | extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *); |
1da177e4 LT |
767 | extern int posix_lock_file(struct file *, struct file_lock *); |
768 | extern int posix_lock_file_wait(struct file *, struct file_lock *); | |
64a318ee | 769 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
1da177e4 LT |
770 | extern int posix_locks_deadlock(struct file_lock *, struct file_lock *); |
771 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); | |
772 | extern int __break_lease(struct inode *inode, unsigned int flags); | |
773 | extern void lease_get_mtime(struct inode *, struct timespec *time); | |
774 | extern int setlease(struct file *, long, struct file_lock **); | |
775 | extern int lease_modify(struct file_lock **, int); | |
776 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); | |
777 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); | |
778 | extern void steal_locks(fl_owner_t from); | |
779 | ||
780 | struct fasync_struct { | |
781 | int magic; | |
782 | int fa_fd; | |
783 | struct fasync_struct *fa_next; /* singly linked list */ | |
784 | struct file *fa_file; | |
785 | }; | |
786 | ||
787 | #define FASYNC_MAGIC 0x4601 | |
788 | ||
789 | /* SMP safe fasync helpers: */ | |
790 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
791 | /* can be called from interrupts */ | |
792 | extern void kill_fasync(struct fasync_struct **, int, int); | |
793 | /* only for net: no internal synchronization */ | |
794 | extern void __kill_fasync(struct fasync_struct *, int, int); | |
795 | ||
796 | extern int f_setown(struct file *filp, unsigned long arg, int force); | |
797 | extern void f_delown(struct file *filp); | |
798 | extern int send_sigurg(struct fown_struct *fown); | |
799 | ||
800 | /* | |
801 | * Umount options | |
802 | */ | |
803 | ||
804 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
805 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
806 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
807 | ||
808 | extern struct list_head super_blocks; | |
809 | extern spinlock_t sb_lock; | |
810 | ||
811 | #define sb_entry(list) list_entry((list), struct super_block, s_list) | |
812 | #define S_BIAS (1<<30) | |
813 | struct super_block { | |
814 | struct list_head s_list; /* Keep this first */ | |
815 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
816 | unsigned long s_blocksize; | |
1da177e4 LT |
817 | unsigned char s_blocksize_bits; |
818 | unsigned char s_dirt; | |
819 | unsigned long long s_maxbytes; /* Max file size */ | |
820 | struct file_system_type *s_type; | |
821 | struct super_operations *s_op; | |
822 | struct dquot_operations *dq_op; | |
823 | struct quotactl_ops *s_qcop; | |
824 | struct export_operations *s_export_op; | |
825 | unsigned long s_flags; | |
826 | unsigned long s_magic; | |
827 | struct dentry *s_root; | |
828 | struct rw_semaphore s_umount; | |
7892f2f4 | 829 | struct mutex s_lock; |
1da177e4 LT |
830 | int s_count; |
831 | int s_syncing; | |
832 | int s_need_sync_fs; | |
833 | atomic_t s_active; | |
834 | void *s_security; | |
835 | struct xattr_handler **s_xattr; | |
836 | ||
837 | struct list_head s_inodes; /* all inodes */ | |
838 | struct list_head s_dirty; /* dirty inodes */ | |
839 | struct list_head s_io; /* parked for writeback */ | |
840 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ | |
841 | struct list_head s_files; | |
842 | ||
843 | struct block_device *s_bdev; | |
844 | struct list_head s_instances; | |
845 | struct quota_info s_dquot; /* Diskquota specific options */ | |
846 | ||
847 | int s_frozen; | |
848 | wait_queue_head_t s_wait_unfrozen; | |
849 | ||
850 | char s_id[32]; /* Informational name */ | |
851 | ||
852 | void *s_fs_info; /* Filesystem private info */ | |
853 | ||
854 | /* | |
855 | * The next field is for VFS *only*. No filesystems have any business | |
856 | * even looking at it. You had been warned. | |
857 | */ | |
a11f3a05 | 858 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 LT |
859 | |
860 | /* Granuality of c/m/atime in ns. | |
861 | Cannot be worse than a second */ | |
862 | u32 s_time_gran; | |
863 | }; | |
864 | ||
865 | extern struct timespec current_fs_time(struct super_block *sb); | |
866 | ||
867 | /* | |
868 | * Snapshotting support. | |
869 | */ | |
870 | enum { | |
871 | SB_UNFROZEN = 0, | |
872 | SB_FREEZE_WRITE = 1, | |
873 | SB_FREEZE_TRANS = 2, | |
874 | }; | |
875 | ||
876 | #define vfs_check_frozen(sb, level) \ | |
877 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) | |
878 | ||
22e2c507 JA |
879 | static inline void get_fs_excl(void) |
880 | { | |
881 | atomic_inc(¤t->fs_excl); | |
882 | } | |
883 | ||
884 | static inline void put_fs_excl(void) | |
885 | { | |
886 | atomic_dec(¤t->fs_excl); | |
887 | } | |
888 | ||
889 | static inline int has_fs_excl(void) | |
890 | { | |
891 | return atomic_read(¤t->fs_excl); | |
892 | } | |
893 | ||
894 | ||
1da177e4 LT |
895 | /* |
896 | * Superblock locking. | |
897 | */ | |
898 | static inline void lock_super(struct super_block * sb) | |
899 | { | |
22e2c507 | 900 | get_fs_excl(); |
7892f2f4 | 901 | mutex_lock(&sb->s_lock); |
1da177e4 LT |
902 | } |
903 | ||
904 | static inline void unlock_super(struct super_block * sb) | |
905 | { | |
22e2c507 | 906 | put_fs_excl(); |
7892f2f4 | 907 | mutex_unlock(&sb->s_lock); |
1da177e4 LT |
908 | } |
909 | ||
910 | /* | |
911 | * VFS helper functions.. | |
912 | */ | |
e4543edd | 913 | extern int vfs_permission(struct nameidata *, int); |
1da177e4 LT |
914 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
915 | extern int vfs_mkdir(struct inode *, struct dentry *, int); | |
916 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
917 | extern int vfs_symlink(struct inode *, struct dentry *, const char *, int); | |
918 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); | |
919 | extern int vfs_rmdir(struct inode *, struct dentry *); | |
920 | extern int vfs_unlink(struct inode *, struct dentry *); | |
921 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
922 | ||
923 | /* | |
924 | * VFS dentry helper functions. | |
925 | */ | |
926 | extern void dentry_unhash(struct dentry *dentry); | |
927 | ||
8c744fb8 CH |
928 | /* |
929 | * VFS file helper functions. | |
930 | */ | |
931 | extern int file_permission(struct file *, int); | |
932 | ||
1da177e4 LT |
933 | /* |
934 | * File types | |
935 | * | |
936 | * NOTE! These match bits 12..15 of stat.st_mode | |
937 | * (ie "(i_mode >> 12) & 15"). | |
938 | */ | |
939 | #define DT_UNKNOWN 0 | |
940 | #define DT_FIFO 1 | |
941 | #define DT_CHR 2 | |
942 | #define DT_DIR 4 | |
943 | #define DT_BLK 6 | |
944 | #define DT_REG 8 | |
945 | #define DT_LNK 10 | |
946 | #define DT_SOCK 12 | |
947 | #define DT_WHT 14 | |
948 | ||
949 | #define OSYNC_METADATA (1<<0) | |
950 | #define OSYNC_DATA (1<<1) | |
951 | #define OSYNC_INODE (1<<2) | |
952 | int generic_osync_inode(struct inode *, struct address_space *, int); | |
953 | ||
954 | /* | |
955 | * This is the "filldir" function type, used by readdir() to let | |
956 | * the kernel specify what kind of dirent layout it wants to have. | |
957 | * This allows the kernel to read directories into kernel space or | |
958 | * to have different dirent layouts depending on the binary type. | |
959 | */ | |
960 | typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned); | |
961 | ||
962 | struct block_device_operations { | |
963 | int (*open) (struct inode *, struct file *); | |
964 | int (*release) (struct inode *, struct file *); | |
965 | int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long); | |
bb93e3a5 | 966 | long (*unlocked_ioctl) (struct file *, unsigned, unsigned long); |
1da177e4 | 967 | long (*compat_ioctl) (struct file *, unsigned, unsigned long); |
420edbcc | 968 | int (*direct_access) (struct block_device *, sector_t, unsigned long *); |
1da177e4 LT |
969 | int (*media_changed) (struct gendisk *); |
970 | int (*revalidate_disk) (struct gendisk *); | |
a885c8c4 | 971 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
1da177e4 LT |
972 | struct module *owner; |
973 | }; | |
974 | ||
975 | /* | |
976 | * "descriptor" for what we're up to with a read for sendfile(). | |
977 | * This allows us to use the same read code yet | |
978 | * have multiple different users of the data that | |
979 | * we read from a file. | |
980 | * | |
981 | * The simplest case just copies the data to user | |
982 | * mode. | |
983 | */ | |
984 | typedef struct { | |
985 | size_t written; | |
986 | size_t count; | |
987 | union { | |
988 | char __user * buf; | |
989 | void *data; | |
990 | } arg; | |
991 | int error; | |
992 | } read_descriptor_t; | |
993 | ||
994 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long); | |
995 | ||
996 | /* These macros are for out of kernel modules to test that | |
997 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
998 | * fields in struct file_operations. */ | |
999 | #define HAVE_COMPAT_IOCTL 1 | |
1000 | #define HAVE_UNLOCKED_IOCTL 1 | |
1001 | ||
1002 | /* | |
1003 | * NOTE: | |
1004 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl | |
1005 | * can be called without the big kernel lock held in all filesystems. | |
1006 | */ | |
1007 | struct file_operations { | |
1008 | struct module *owner; | |
1009 | loff_t (*llseek) (struct file *, loff_t, int); | |
1010 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1011 | ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); | |
1012 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); | |
1013 | ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); | |
1014 | int (*readdir) (struct file *, void *, filldir_t); | |
1015 | unsigned int (*poll) (struct file *, struct poll_table_struct *); | |
1016 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); | |
1017 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); | |
1018 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1019 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1020 | int (*open) (struct inode *, struct file *); | |
1021 | int (*flush) (struct file *); | |
1022 | int (*release) (struct inode *, struct file *); | |
1023 | int (*fsync) (struct file *, struct dentry *, int datasync); | |
1024 | int (*aio_fsync) (struct kiocb *, int datasync); | |
1025 | int (*fasync) (int, struct file *, int); | |
1026 | int (*lock) (struct file *, int, struct file_lock *); | |
1027 | ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); | |
1028 | ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); | |
1029 | ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); | |
1030 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); | |
1031 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1032 | int (*check_flags)(int); | |
1033 | int (*dir_notify)(struct file *filp, unsigned long arg); | |
1034 | int (*flock) (struct file *, int, struct file_lock *); | |
5274f052 JA |
1035 | ssize_t (*splice_write)(struct inode *, struct file *, size_t, unsigned int); |
1036 | ssize_t (*splice_read)(struct file *, struct inode *, size_t, unsigned int); | |
1da177e4 LT |
1037 | }; |
1038 | ||
1039 | struct inode_operations { | |
1040 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); | |
1041 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); | |
1042 | int (*link) (struct dentry *,struct inode *,struct dentry *); | |
1043 | int (*unlink) (struct inode *,struct dentry *); | |
1044 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
1045 | int (*mkdir) (struct inode *,struct dentry *,int); | |
1046 | int (*rmdir) (struct inode *,struct dentry *); | |
1047 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); | |
1048 | int (*rename) (struct inode *, struct dentry *, | |
1049 | struct inode *, struct dentry *); | |
1050 | int (*readlink) (struct dentry *, char __user *,int); | |
cc314eef LT |
1051 | void * (*follow_link) (struct dentry *, struct nameidata *); |
1052 | void (*put_link) (struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
1053 | void (*truncate) (struct inode *); |
1054 | int (*permission) (struct inode *, int, struct nameidata *); | |
1055 | int (*setattr) (struct dentry *, struct iattr *); | |
1056 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1057 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); | |
1058 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); | |
1059 | ssize_t (*listxattr) (struct dentry *, char *, size_t); | |
1060 | int (*removexattr) (struct dentry *, const char *); | |
f6b3ec23 | 1061 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
1da177e4 LT |
1062 | }; |
1063 | ||
1064 | struct seq_file; | |
1065 | ||
1066 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); | |
1067 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1068 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
1069 | unsigned long, loff_t *); | |
1070 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, | |
1071 | unsigned long, loff_t *); | |
1072 | ||
1073 | /* | |
1074 | * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called | |
1075 | * without the big kernel lock held in all filesystems. | |
1076 | */ | |
1077 | struct super_operations { | |
1078 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1079 | void (*destroy_inode)(struct inode *); | |
1080 | ||
1081 | void (*read_inode) (struct inode *); | |
1082 | ||
1083 | void (*dirty_inode) (struct inode *); | |
1084 | int (*write_inode) (struct inode *, int); | |
1085 | void (*put_inode) (struct inode *); | |
1086 | void (*drop_inode) (struct inode *); | |
1087 | void (*delete_inode) (struct inode *); | |
1088 | void (*put_super) (struct super_block *); | |
1089 | void (*write_super) (struct super_block *); | |
1090 | int (*sync_fs)(struct super_block *sb, int wait); | |
1091 | void (*write_super_lockfs) (struct super_block *); | |
1092 | void (*unlockfs) (struct super_block *); | |
1093 | int (*statfs) (struct super_block *, struct kstatfs *); | |
1094 | int (*remount_fs) (struct super_block *, int *, char *); | |
1095 | void (*clear_inode) (struct inode *); | |
1096 | void (*umount_begin) (struct super_block *); | |
1097 | ||
1098 | int (*show_options)(struct seq_file *, struct vfsmount *); | |
b4629fe2 | 1099 | int (*show_stats)(struct seq_file *, struct vfsmount *); |
1da177e4 LT |
1100 | |
1101 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); | |
1102 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
1103 | }; | |
1104 | ||
1105 | /* Inode state bits. Protected by inode_lock. */ | |
1106 | #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */ | |
1107 | #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */ | |
1108 | #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */ | |
1109 | #define __I_LOCK 3 | |
1110 | #define I_LOCK (1 << __I_LOCK) | |
1111 | #define I_FREEING 16 | |
1112 | #define I_CLEAR 32 | |
1113 | #define I_NEW 64 | |
991114c6 | 1114 | #define I_WILL_FREE 128 |
1da177e4 LT |
1115 | |
1116 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
1117 | ||
1118 | extern void __mark_inode_dirty(struct inode *, int); | |
1119 | static inline void mark_inode_dirty(struct inode *inode) | |
1120 | { | |
1121 | __mark_inode_dirty(inode, I_DIRTY); | |
1122 | } | |
1123 | ||
1124 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1125 | { | |
1126 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1127 | } | |
1128 | ||
66d21730 AD |
1129 | static inline void inode_inc_link_count(struct inode *inode) |
1130 | { | |
1131 | inode->i_nlink++; | |
1132 | mark_inode_dirty(inode); | |
1133 | } | |
1134 | ||
1135 | static inline void inode_dec_link_count(struct inode *inode) | |
1136 | { | |
1137 | inode->i_nlink--; | |
1138 | mark_inode_dirty(inode); | |
1139 | } | |
1140 | ||
869243a0 | 1141 | extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
1da177e4 LT |
1142 | static inline void file_accessed(struct file *file) |
1143 | { | |
1144 | if (!(file->f_flags & O_NOATIME)) | |
1145 | touch_atime(file->f_vfsmnt, file->f_dentry); | |
1146 | } | |
1147 | ||
1148 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
1149 | ||
1150 | /** | |
4dc3b16b PP |
1151 | * struct export_operations - for nfsd to communicate with file systems |
1152 | * @decode_fh: decode a file handle fragment and return a &struct dentry | |
1153 | * @encode_fh: encode a file handle fragment from a dentry | |
1154 | * @get_name: find the name for a given inode in a given directory | |
1155 | * @get_parent: find the parent of a given directory | |
1156 | * @get_dentry: find a dentry for the inode given a file handle sub-fragment | |
8f2709b5 RD |
1157 | * @find_exported_dentry: |
1158 | * set by the exporting module to a standard helper function. | |
1da177e4 LT |
1159 | * |
1160 | * Description: | |
1161 | * The export_operations structure provides a means for nfsd to communicate | |
1162 | * with a particular exported file system - particularly enabling nfsd and | |
1163 | * the filesystem to co-operate when dealing with file handles. | |
1164 | * | |
67be2dd1 MW |
1165 | * export_operations contains two basic operation for dealing with file |
1166 | * handles, decode_fh() and encode_fh(), and allows for some other | |
1167 | * operations to be defined which standard helper routines use to get | |
1168 | * specific information from the filesystem. | |
1da177e4 LT |
1169 | * |
1170 | * nfsd encodes information use to determine which filesystem a filehandle | |
67be2dd1 MW |
1171 | * applies to in the initial part of the file handle. The remainder, termed |
1172 | * a file handle fragment, is controlled completely by the filesystem. The | |
1173 | * standard helper routines assume that this fragment will contain one or | |
1174 | * two sub-fragments, one which identifies the file, and one which may be | |
1175 | * used to identify the (a) directory containing the file. | |
1da177e4 LT |
1176 | * |
1177 | * In some situations, nfsd needs to get a dentry which is connected into a | |
67be2dd1 MW |
1178 | * specific part of the file tree. To allow for this, it passes the |
1179 | * function acceptable() together with a @context which can be used to see | |
1180 | * if the dentry is acceptable. As there can be multiple dentrys for a | |
1181 | * given file, the filesystem should check each one for acceptability before | |
1182 | * looking for the next. As soon as an acceptable one is found, it should | |
1183 | * be returned. | |
1da177e4 LT |
1184 | * |
1185 | * decode_fh: | |
67be2dd1 MW |
1186 | * @decode_fh is given a &struct super_block (@sb), a file handle fragment |
1187 | * (@fh, @fh_len) and an acceptability testing function (@acceptable, | |
1188 | * @context). It should return a &struct dentry which refers to the same | |
1189 | * file that the file handle fragment refers to, and which passes the | |
1190 | * acceptability test. If it cannot, it should return a %NULL pointer if | |
1191 | * the file was found but no acceptable &dentries were available, or a | |
1192 | * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or | |
1193 | * %ENOMEM). | |
1da177e4 LT |
1194 | * |
1195 | * encode_fh: | |
67be2dd1 MW |
1196 | * @encode_fh should store in the file handle fragment @fh (using at most |
1197 | * @max_len bytes) information that can be used by @decode_fh to recover the | |
1198 | * file refered to by the &struct dentry @de. If the @connectable flag is | |
1199 | * set, the encode_fh() should store sufficient information so that a good | |
1200 | * attempt can be made to find not only the file but also it's place in the | |
1201 | * filesystem. This typically means storing a reference to de->d_parent in | |
1202 | * the filehandle fragment. encode_fh() should return the number of bytes | |
1203 | * stored or a negative error code such as %-ENOSPC | |
1da177e4 LT |
1204 | * |
1205 | * get_name: | |
67be2dd1 MW |
1206 | * @get_name should find a name for the given @child in the given @parent |
1207 | * directory. The name should be stored in the @name (with the | |
1208 | * understanding that it is already pointing to a a %NAME_MAX+1 sized | |
1209 | * buffer. get_name() should return %0 on success, a negative error code | |
1b1dcc1b | 1210 | * or error. @get_name will be called without @parent->i_mutex held. |
1da177e4 LT |
1211 | * |
1212 | * get_parent: | |
67be2dd1 MW |
1213 | * @get_parent should find the parent directory for the given @child which |
1214 | * is also a directory. In the event that it cannot be found, or storage | |
1215 | * space cannot be allocated, a %ERR_PTR should be returned. | |
1da177e4 LT |
1216 | * |
1217 | * get_dentry: | |
67be2dd1 MW |
1218 | * Given a &super_block (@sb) and a pointer to a file-system specific inode |
1219 | * identifier, possibly an inode number, (@inump) get_dentry() should find | |
1220 | * the identified inode and return a dentry for that inode. Any suitable | |
1221 | * dentry can be returned including, if necessary, a new dentry created with | |
1222 | * d_alloc_root. The caller can then find any other extant dentrys by | |
1223 | * following the d_alias links. If a new dentry was created using | |
1224 | * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry | |
1225 | * should be d_rehash()ed. | |
1da177e4 | 1226 | * |
67be2dd1 MW |
1227 | * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code |
1228 | * can be returned. The @inump will be whatever was passed to | |
1229 | * nfsd_find_fh_dentry() in either the @obj or @parent parameters. | |
1da177e4 LT |
1230 | * |
1231 | * Locking rules: | |
1b1dcc1b | 1232 | * get_parent is called with child->d_inode->i_mutex down |
67be2dd1 | 1233 | * get_name is not (which is possibly inconsistent) |
1da177e4 LT |
1234 | */ |
1235 | ||
1236 | struct export_operations { | |
1237 | struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, | |
1238 | int (*acceptable)(void *context, struct dentry *de), | |
1239 | void *context); | |
1240 | int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, | |
1241 | int connectable); | |
1242 | ||
1243 | /* the following are only called from the filesystem itself */ | |
1244 | int (*get_name)(struct dentry *parent, char *name, | |
1245 | struct dentry *child); | |
1246 | struct dentry * (*get_parent)(struct dentry *child); | |
1247 | struct dentry * (*get_dentry)(struct super_block *sb, void *inump); | |
1248 | ||
1249 | /* This is set by the exporting module to a standard helper */ | |
1250 | struct dentry * (*find_exported_dentry)( | |
1251 | struct super_block *sb, void *obj, void *parent, | |
1252 | int (*acceptable)(void *context, struct dentry *de), | |
1253 | void *context); | |
1254 | ||
1255 | ||
1256 | }; | |
1257 | ||
1258 | extern struct dentry * | |
1259 | find_exported_dentry(struct super_block *sb, void *obj, void *parent, | |
1260 | int (*acceptable)(void *context, struct dentry *de), | |
1261 | void *context); | |
1262 | ||
1263 | struct file_system_type { | |
1264 | const char *name; | |
1265 | int fs_flags; | |
1266 | struct super_block *(*get_sb) (struct file_system_type *, int, | |
1267 | const char *, void *); | |
1268 | void (*kill_sb) (struct super_block *); | |
1269 | struct module *owner; | |
1270 | struct file_system_type * next; | |
1271 | struct list_head fs_supers; | |
1272 | }; | |
1273 | ||
1274 | struct super_block *get_sb_bdev(struct file_system_type *fs_type, | |
1275 | int flags, const char *dev_name, void *data, | |
1276 | int (*fill_super)(struct super_block *, void *, int)); | |
1277 | struct super_block *get_sb_single(struct file_system_type *fs_type, | |
1278 | int flags, void *data, | |
1279 | int (*fill_super)(struct super_block *, void *, int)); | |
1280 | struct super_block *get_sb_nodev(struct file_system_type *fs_type, | |
1281 | int flags, void *data, | |
1282 | int (*fill_super)(struct super_block *, void *, int)); | |
1283 | void generic_shutdown_super(struct super_block *sb); | |
1284 | void kill_block_super(struct super_block *sb); | |
1285 | void kill_anon_super(struct super_block *sb); | |
1286 | void kill_litter_super(struct super_block *sb); | |
1287 | void deactivate_super(struct super_block *sb); | |
1288 | int set_anon_super(struct super_block *s, void *data); | |
1289 | struct super_block *sget(struct file_system_type *type, | |
1290 | int (*test)(struct super_block *,void *), | |
1291 | int (*set)(struct super_block *,void *), | |
1292 | void *data); | |
1293 | struct super_block *get_sb_pseudo(struct file_system_type *, char *, | |
1294 | struct super_operations *ops, unsigned long); | |
1295 | int __put_super(struct super_block *sb); | |
1296 | int __put_super_and_need_restart(struct super_block *sb); | |
1297 | void unnamed_dev_init(void); | |
1298 | ||
1299 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
1300 | #define fops_get(fops) \ | |
1301 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
1302 | #define fops_put(fops) \ | |
1303 | do { if (fops) module_put((fops)->owner); } while(0) | |
1304 | ||
1305 | extern int register_filesystem(struct file_system_type *); | |
1306 | extern int unregister_filesystem(struct file_system_type *); | |
1307 | extern struct vfsmount *kern_mount(struct file_system_type *); | |
1308 | extern int may_umount_tree(struct vfsmount *); | |
1309 | extern int may_umount(struct vfsmount *); | |
a05964f3 | 1310 | extern void umount_tree(struct vfsmount *, int, struct list_head *); |
b90fa9ae | 1311 | extern void release_mounts(struct list_head *); |
1da177e4 | 1312 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
b90fa9ae RP |
1313 | extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int); |
1314 | extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *, | |
1315 | struct vfsmount *); | |
1da177e4 LT |
1316 | |
1317 | extern int vfs_statfs(struct super_block *, struct kstatfs *); | |
1318 | ||
f87fd4c2 MS |
1319 | /* /sys/fs */ |
1320 | extern struct subsystem fs_subsys; | |
1321 | ||
1da177e4 LT |
1322 | #define FLOCK_VERIFY_READ 1 |
1323 | #define FLOCK_VERIFY_WRITE 2 | |
1324 | ||
1325 | extern int locks_mandatory_locked(struct inode *); | |
1326 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); | |
1327 | ||
1328 | /* | |
1329 | * Candidates for mandatory locking have the setgid bit set | |
1330 | * but no group execute bit - an otherwise meaningless combination. | |
1331 | */ | |
1332 | #define MANDATORY_LOCK(inode) \ | |
1333 | (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
1334 | ||
1335 | static inline int locks_verify_locked(struct inode *inode) | |
1336 | { | |
1337 | if (MANDATORY_LOCK(inode)) | |
1338 | return locks_mandatory_locked(inode); | |
1339 | return 0; | |
1340 | } | |
1341 | ||
1342 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); | |
1343 | ||
1344 | static inline int locks_verify_truncate(struct inode *inode, | |
1345 | struct file *filp, | |
1346 | loff_t size) | |
1347 | { | |
1348 | if (inode->i_flock && MANDATORY_LOCK(inode)) | |
1349 | return locks_mandatory_area( | |
1350 | FLOCK_VERIFY_WRITE, inode, filp, | |
1351 | size < inode->i_size ? size : inode->i_size, | |
1352 | (size < inode->i_size ? inode->i_size - size | |
1353 | : size - inode->i_size) | |
1354 | ); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static inline int break_lease(struct inode *inode, unsigned int mode) | |
1359 | { | |
1360 | if (inode->i_flock) | |
1361 | return __break_lease(inode, mode); | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | /* fs/open.c */ | |
1366 | ||
4a30131e N |
1367 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
1368 | struct file *filp); | |
5590ff0d UD |
1369 | extern long do_sys_open(int fdf, const char __user *filename, int flags, |
1370 | int mode); | |
1da177e4 LT |
1371 | extern struct file *filp_open(const char *, int, int); |
1372 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int); | |
1373 | extern int filp_close(struct file *, fl_owner_t id); | |
1374 | extern char * getname(const char __user *); | |
1375 | ||
1376 | /* fs/dcache.c */ | |
1377 | extern void __init vfs_caches_init_early(void); | |
1378 | extern void __init vfs_caches_init(unsigned long); | |
1379 | ||
1380 | #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL) | |
1381 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) | |
1382 | #ifndef CONFIG_AUDITSYSCALL | |
1383 | #define putname(name) __putname(name) | |
1384 | #else | |
1385 | extern void putname(const char *name); | |
1386 | #endif | |
1387 | ||
1388 | extern int register_blkdev(unsigned int, const char *); | |
1389 | extern int unregister_blkdev(unsigned int, const char *); | |
1390 | extern struct block_device *bdget(dev_t); | |
1391 | extern void bd_set_size(struct block_device *, loff_t size); | |
1392 | extern void bd_forget(struct inode *inode); | |
1393 | extern void bdput(struct block_device *); | |
1394 | extern struct block_device *open_by_devnum(dev_t, unsigned); | |
4b6f5d20 | 1395 | extern const struct file_operations def_blk_fops; |
1da177e4 | 1396 | extern struct address_space_operations def_blk_aops; |
4b6f5d20 AV |
1397 | extern const struct file_operations def_chr_fops; |
1398 | extern const struct file_operations bad_sock_fops; | |
1399 | extern const struct file_operations def_fifo_fops; | |
1da177e4 LT |
1400 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
1401 | extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long); | |
1402 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); | |
1403 | extern int blkdev_get(struct block_device *, mode_t, unsigned); | |
1404 | extern int blkdev_put(struct block_device *); | |
1405 | extern int bd_claim(struct block_device *, void *); | |
1406 | extern void bd_release(struct block_device *); | |
641dc636 JN |
1407 | #ifdef CONFIG_SYSFS |
1408 | extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); | |
1409 | extern void bd_release_from_disk(struct block_device *, struct gendisk *); | |
1410 | #else | |
1411 | #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) | |
1412 | #define bd_release_from_disk(bdev, disk) bd_release(bdev) | |
1413 | #endif | |
1da177e4 LT |
1414 | |
1415 | /* fs/char_dev.c */ | |
1416 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); | |
1417 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1418 | extern int register_chrdev(unsigned int, const char *, | |
99ac48f5 | 1419 | const struct file_operations *); |
1da177e4 LT |
1420 | extern int unregister_chrdev(unsigned int, const char *); |
1421 | extern void unregister_chrdev_region(dev_t, unsigned); | |
1422 | extern int chrdev_open(struct inode *, struct file *); | |
7170be5f NH |
1423 | extern int get_chrdev_list(char *); |
1424 | extern void *acquire_chrdev_list(void); | |
1425 | extern int count_chrdev_list(void); | |
1426 | extern void *get_next_chrdev(void *); | |
1427 | extern int get_chrdev_info(void *, int *, char **); | |
1428 | extern void release_chrdev_list(void *); | |
1da177e4 LT |
1429 | |
1430 | /* fs/block_dev.c */ | |
1431 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1432 | extern const char *__bdevname(dev_t, char *buffer); | |
1433 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
1434 | extern struct block_device *lookup_bdev(const char *); | |
1435 | extern struct block_device *open_bdev_excl(const char *, int, void *); | |
1436 | extern void close_bdev_excl(struct block_device *); | |
7170be5f NH |
1437 | extern void *acquire_blkdev_list(void); |
1438 | extern int count_blkdev_list(void); | |
1439 | extern void *get_next_blkdev(void *); | |
1440 | extern int get_blkdev_info(void *, int *, char **); | |
1441 | extern void release_blkdev_list(void *); | |
1da177e4 LT |
1442 | |
1443 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
1444 | ||
1445 | /* Invalid inode operations -- fs/bad_inode.c */ | |
1446 | extern void make_bad_inode(struct inode *); | |
1447 | extern int is_bad_inode(struct inode *); | |
1448 | ||
4b6f5d20 AV |
1449 | extern const struct file_operations read_fifo_fops; |
1450 | extern const struct file_operations write_fifo_fops; | |
1451 | extern const struct file_operations rdwr_fifo_fops; | |
1da177e4 LT |
1452 | |
1453 | extern int fs_may_remount_ro(struct super_block *); | |
1454 | ||
1455 | /* | |
1456 | * return READ, READA, or WRITE | |
1457 | */ | |
1458 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) | |
1459 | ||
1460 | /* | |
1461 | * return data direction, READ or WRITE | |
1462 | */ | |
1463 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) | |
1464 | ||
1465 | extern int check_disk_change(struct block_device *); | |
1466 | extern int invalidate_inodes(struct super_block *); | |
2ef41634 | 1467 | extern int __invalidate_device(struct block_device *); |
1da177e4 LT |
1468 | extern int invalidate_partition(struct gendisk *, int); |
1469 | unsigned long invalidate_mapping_pages(struct address_space *mapping, | |
1470 | pgoff_t start, pgoff_t end); | |
1471 | unsigned long invalidate_inode_pages(struct address_space *mapping); | |
1472 | static inline void invalidate_remote_inode(struct inode *inode) | |
1473 | { | |
1474 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
1475 | S_ISLNK(inode->i_mode)) | |
1476 | invalidate_inode_pages(inode->i_mapping); | |
1477 | } | |
1478 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
1479 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
1480 | pgoff_t start, pgoff_t end); | |
1481 | extern int write_inode_now(struct inode *, int); | |
1482 | extern int filemap_fdatawrite(struct address_space *); | |
1483 | extern int filemap_flush(struct address_space *); | |
1484 | extern int filemap_fdatawait(struct address_space *); | |
1485 | extern int filemap_write_and_wait(struct address_space *mapping); | |
1486 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
1487 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
1488 | extern int wait_on_page_writeback_range(struct address_space *mapping, |
1489 | pgoff_t start, pgoff_t end); | |
1490 | extern int __filemap_fdatawrite_range(struct address_space *mapping, | |
1491 | loff_t start, loff_t end, int sync_mode); | |
1492 | ||
18e79b40 | 1493 | extern long do_fsync(struct file *file, int datasync); |
1da177e4 LT |
1494 | extern void sync_supers(void); |
1495 | extern void sync_filesystems(int wait); | |
1496 | extern void emergency_sync(void); | |
1497 | extern void emergency_remount(void); | |
1498 | extern int do_remount_sb(struct super_block *sb, int flags, | |
1499 | void *data, int force); | |
1500 | extern sector_t bmap(struct inode *, sector_t); | |
1da177e4 LT |
1501 | extern int notify_change(struct dentry *, struct iattr *); |
1502 | extern int permission(struct inode *, int, struct nameidata *); | |
1503 | extern int generic_permission(struct inode *, int, | |
1504 | int (*check_acl)(struct inode *, int)); | |
1505 | ||
1506 | extern int get_write_access(struct inode *); | |
1507 | extern int deny_write_access(struct file *); | |
1508 | static inline void put_write_access(struct inode * inode) | |
1509 | { | |
1510 | atomic_dec(&inode->i_writecount); | |
1511 | } | |
1512 | static inline void allow_write_access(struct file *file) | |
1513 | { | |
1514 | if (file) | |
1515 | atomic_inc(&file->f_dentry->d_inode->i_writecount); | |
1516 | } | |
1517 | extern int do_pipe(int *); | |
1518 | ||
5590ff0d | 1519 | extern int open_namei(int dfd, const char *, int, int, struct nameidata *); |
1da177e4 LT |
1520 | extern int may_open(struct nameidata *, int, int); |
1521 | ||
1522 | extern int kernel_read(struct file *, unsigned long, char *, unsigned long); | |
1523 | extern struct file * open_exec(const char *); | |
1524 | ||
1525 | /* fs/dcache.c -- generic fs support functions */ | |
1526 | extern int is_subdir(struct dentry *, struct dentry *); | |
1527 | extern ino_t find_inode_number(struct dentry *, struct qstr *); | |
1528 | ||
1529 | #include <linux/err.h> | |
1530 | ||
1531 | /* needed for stackable file system support */ | |
1532 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); | |
1533 | ||
1534 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); | |
1535 | ||
1536 | extern void inode_init_once(struct inode *); | |
1537 | extern void iput(struct inode *); | |
1538 | extern struct inode * igrab(struct inode *); | |
1539 | extern ino_t iunique(struct super_block *, ino_t); | |
1540 | extern int inode_needs_sync(struct inode *inode); | |
1541 | extern void generic_delete_inode(struct inode *inode); | |
cb2c0233 | 1542 | extern void generic_drop_inode(struct inode *inode); |
1da177e4 | 1543 | |
88bd5121 AA |
1544 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
1545 | unsigned long hashval, int (*test)(struct inode *, void *), | |
1546 | void *data); | |
1da177e4 LT |
1547 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
1548 | int (*test)(struct inode *, void *), void *data); | |
1549 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
1550 | ||
1551 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
1552 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
1553 | extern void unlock_new_inode(struct inode *); | |
1554 | ||
1555 | static inline struct inode *iget(struct super_block *sb, unsigned long ino) | |
1556 | { | |
1557 | struct inode *inode = iget_locked(sb, ino); | |
1558 | ||
1559 | if (inode && (inode->i_state & I_NEW)) { | |
1560 | sb->s_op->read_inode(inode); | |
1561 | unlock_new_inode(inode); | |
1562 | } | |
1563 | ||
1564 | return inode; | |
1565 | } | |
1566 | ||
1567 | extern void __iget(struct inode * inode); | |
1568 | extern void clear_inode(struct inode *); | |
1569 | extern void destroy_inode(struct inode *); | |
1570 | extern struct inode *new_inode(struct super_block *); | |
1571 | extern int remove_suid(struct dentry *); | |
1572 | extern void remove_dquot_ref(struct super_block *, int, struct list_head *); | |
1da177e4 LT |
1573 | |
1574 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
1575 | extern void remove_inode_hash(struct inode *); | |
1576 | static inline void insert_inode_hash(struct inode *inode) { | |
1577 | __insert_inode_hash(inode, inode->i_ino); | |
1578 | } | |
1579 | ||
1580 | extern struct file * get_empty_filp(void); | |
1581 | extern void file_move(struct file *f, struct list_head *list); | |
1582 | extern void file_kill(struct file *f); | |
1583 | struct bio; | |
1584 | extern void submit_bio(int, struct bio *); | |
1585 | extern int bdev_read_only(struct block_device *); | |
1586 | extern int set_blocksize(struct block_device *, int); | |
1587 | extern int sb_set_blocksize(struct super_block *, int); | |
1588 | extern int sb_min_blocksize(struct super_block *, int); | |
1589 | ||
1590 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
1591 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
1592 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1593 | extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); | |
1594 | extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *); | |
1595 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); | |
1596 | extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *); | |
1597 | extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t); | |
1598 | extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *); | |
1599 | extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t); | |
1600 | extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, | |
1601 | unsigned long, loff_t *); | |
1602 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, | |
1603 | unsigned long *, loff_t, loff_t *, size_t, size_t); | |
1604 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, | |
1605 | unsigned long, loff_t, loff_t *, size_t, ssize_t); | |
1606 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); | |
1607 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); | |
1608 | ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, | |
1609 | unsigned long nr_segs, loff_t *ppos); | |
1610 | extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); | |
1611 | extern void do_generic_mapping_read(struct address_space *mapping, | |
1612 | struct file_ra_state *, struct file *, | |
1613 | loff_t *, read_descriptor_t *, read_actor_t); | |
5274f052 JA |
1614 | extern ssize_t generic_file_splice_read(struct file *, struct inode *, size_t, unsigned int); |
1615 | extern ssize_t generic_file_splice_write(struct inode *, struct file *, size_t, unsigned int); | |
1da177e4 LT |
1616 | extern void |
1617 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
1da177e4 LT |
1618 | extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, |
1619 | unsigned long nr_segs, loff_t *ppos); | |
1620 | ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, | |
1621 | unsigned long nr_segs, loff_t *ppos); | |
1622 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); | |
1623 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); | |
1624 | extern loff_t remote_llseek(struct file *file, loff_t offset, int origin); | |
1625 | extern int generic_file_open(struct inode * inode, struct file * filp); | |
1626 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
1627 | ||
ceffc078 | 1628 | #ifdef CONFIG_FS_XIP |
eb6fe0c3 CO |
1629 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
1630 | loff_t *ppos); | |
ceffc078 CO |
1631 | extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos, |
1632 | size_t count, read_actor_t actor, | |
1633 | void *target); | |
1634 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); | |
eb6fe0c3 CO |
1635 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
1636 | size_t len, loff_t *ppos); | |
ceffc078 | 1637 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
6d79125b CO |
1638 | #else |
1639 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) | |
1640 | { | |
1641 | return 0; | |
1642 | } | |
ceffc078 CO |
1643 | #endif |
1644 | ||
1da177e4 LT |
1645 | static inline void do_generic_file_read(struct file * filp, loff_t *ppos, |
1646 | read_descriptor_t * desc, | |
1647 | read_actor_t actor) | |
1648 | { | |
1649 | do_generic_mapping_read(filp->f_mapping, | |
1650 | &filp->f_ra, | |
1651 | filp, | |
1652 | ppos, | |
1653 | desc, | |
1654 | actor); | |
1655 | } | |
1656 | ||
1657 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, | |
1658 | struct block_device *bdev, const struct iovec *iov, loff_t offset, | |
1d8fa7a2 | 1659 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
1da177e4 LT |
1660 | int lock_type); |
1661 | ||
1662 | enum { | |
1663 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ | |
1664 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ | |
1665 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ | |
1666 | }; | |
1667 | ||
1668 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, | |
1669 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1670 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1671 | dio_iodone_t end_io) |
1672 | { | |
1673 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1674 | nr_segs, get_block, end_io, DIO_LOCKING); |
1da177e4 LT |
1675 | } |
1676 | ||
1677 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, | |
1678 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1679 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1680 | dio_iodone_t end_io) |
1681 | { | |
1682 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1683 | nr_segs, get_block, end_io, DIO_NO_LOCKING); |
1da177e4 LT |
1684 | } |
1685 | ||
1686 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, | |
1687 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, | |
1d8fa7a2 | 1688 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
1da177e4 LT |
1689 | dio_iodone_t end_io) |
1690 | { | |
1691 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, | |
1d8fa7a2 | 1692 | nr_segs, get_block, end_io, DIO_OWN_LOCKING); |
1da177e4 LT |
1693 | } |
1694 | ||
4b6f5d20 | 1695 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
1696 | |
1697 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
1698 | ||
1699 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); | |
1700 | extern int vfs_follow_link(struct nameidata *, const char *); | |
1701 | extern int page_readlink(struct dentry *, char __user *, int); | |
cc314eef LT |
1702 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
1703 | extern void page_put_link(struct dentry *, struct nameidata *, void *); | |
0adb25d2 KK |
1704 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
1705 | gfp_t gfp_mask); | |
1da177e4 LT |
1706 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
1707 | extern struct inode_operations page_symlink_inode_operations; | |
1708 | extern int generic_readlink(struct dentry *, char __user *, int); | |
1709 | extern void generic_fillattr(struct inode *, struct kstat *); | |
1710 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
1711 | void inode_add_bytes(struct inode *inode, loff_t bytes); | |
1712 | void inode_sub_bytes(struct inode *inode, loff_t bytes); | |
1713 | loff_t inode_get_bytes(struct inode *inode); | |
1714 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
1715 | ||
1716 | extern int vfs_readdir(struct file *, filldir_t, void *); | |
1717 | ||
1718 | extern int vfs_stat(char __user *, struct kstat *); | |
1719 | extern int vfs_lstat(char __user *, struct kstat *); | |
5590ff0d UD |
1720 | extern int vfs_stat_fd(int dfd, char __user *, struct kstat *); |
1721 | extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); | |
1da177e4 LT |
1722 | extern int vfs_fstat(unsigned int, struct kstat *); |
1723 | ||
1724 | extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long); | |
1725 | ||
1726 | extern struct file_system_type *get_fs_type(const char *name); | |
1727 | extern struct super_block *get_super(struct block_device *); | |
1728 | extern struct super_block *user_get_super(dev_t); | |
1729 | extern void drop_super(struct super_block *sb); | |
1730 | ||
1731 | extern int dcache_dir_open(struct inode *, struct file *); | |
1732 | extern int dcache_dir_close(struct inode *, struct file *); | |
1733 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
1734 | extern int dcache_readdir(struct file *, void *, filldir_t); | |
1735 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
1736 | extern int simple_statfs(struct super_block *, struct kstatfs *); | |
1737 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); | |
1738 | extern int simple_unlink(struct inode *, struct dentry *); | |
1739 | extern int simple_rmdir(struct inode *, struct dentry *); | |
1740 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); | |
1741 | extern int simple_sync_file(struct file *, struct dentry *, int); | |
1742 | extern int simple_empty(struct dentry *); | |
1743 | extern int simple_readpage(struct file *file, struct page *page); | |
1744 | extern int simple_prepare_write(struct file *file, struct page *page, | |
1745 | unsigned offset, unsigned to); | |
1746 | extern int simple_commit_write(struct file *file, struct page *page, | |
1747 | unsigned offset, unsigned to); | |
1748 | ||
1749 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); | |
1750 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); | |
4b6f5d20 | 1751 | extern const struct file_operations simple_dir_operations; |
1da177e4 | 1752 | extern struct inode_operations simple_dir_inode_operations; |
4b6f5d20 | 1753 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 LT |
1754 | struct dentry *d_alloc_name(struct dentry *, const char *); |
1755 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); | |
1756 | extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count); | |
1757 | extern void simple_release_fs(struct vfsmount **mount, int *count); | |
1758 | ||
1759 | extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t); | |
1760 | ||
e965f963 CL |
1761 | #ifdef CONFIG_MIGRATION |
1762 | extern int buffer_migrate_page(struct page *, struct page *); | |
1763 | #else | |
1764 | #define buffer_migrate_page NULL | |
1765 | #endif | |
1766 | ||
1da177e4 LT |
1767 | extern int inode_change_ok(struct inode *, struct iattr *); |
1768 | extern int __must_check inode_setattr(struct inode *, struct iattr *); | |
1769 | ||
870f4817 | 1770 | extern void file_update_time(struct file *file); |
1da177e4 LT |
1771 | |
1772 | static inline ino_t parent_ino(struct dentry *dentry) | |
1773 | { | |
1774 | ino_t res; | |
1775 | ||
1776 | spin_lock(&dentry->d_lock); | |
1777 | res = dentry->d_parent->d_inode->i_ino; | |
1778 | spin_unlock(&dentry->d_lock); | |
1779 | return res; | |
1780 | } | |
1781 | ||
1782 | /* kernel/fork.c */ | |
1783 | extern int unshare_files(void); | |
1784 | ||
1785 | /* Transaction based IO helpers */ | |
1786 | ||
1787 | /* | |
1788 | * An argresp is stored in an allocated page and holds the | |
1789 | * size of the argument or response, along with its content | |
1790 | */ | |
1791 | struct simple_transaction_argresp { | |
1792 | ssize_t size; | |
1793 | char data[0]; | |
1794 | }; | |
1795 | ||
1796 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
1797 | ||
1798 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
1799 | size_t size); | |
1800 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
1801 | size_t size, loff_t *pos); | |
1802 | int simple_transaction_release(struct inode *inode, struct file *file); | |
1803 | ||
1804 | static inline void simple_transaction_set(struct file *file, size_t n) | |
1805 | { | |
1806 | struct simple_transaction_argresp *ar = file->private_data; | |
1807 | ||
1808 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); | |
1809 | ||
1810 | /* | |
1811 | * The barrier ensures that ar->size will really remain zero until | |
1812 | * ar->data is ready for reading. | |
1813 | */ | |
1814 | smp_mb(); | |
1815 | ar->size = n; | |
1816 | } | |
1817 | ||
acaefc25 AB |
1818 | /* |
1819 | * simple attribute files | |
1820 | * | |
1821 | * These attributes behave similar to those in sysfs: | |
1822 | * | |
1823 | * Writing to an attribute immediately sets a value, an open file can be | |
1824 | * written to multiple times. | |
1825 | * | |
1826 | * Reading from an attribute creates a buffer from the value that might get | |
1827 | * read with multiple read calls. When the attribute has been read | |
1828 | * completely, no further read calls are possible until the file is opened | |
1829 | * again. | |
1830 | * | |
1831 | * All attributes contain a text representation of a numeric value | |
1832 | * that are accessed with the get() and set() functions. | |
1833 | */ | |
1834 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
1835 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
1836 | { \ | |
1837 | __simple_attr_check_format(__fmt, 0ull); \ | |
1838 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
1839 | } \ | |
1840 | static struct file_operations __fops = { \ | |
1841 | .owner = THIS_MODULE, \ | |
1842 | .open = __fops ## _open, \ | |
1843 | .release = simple_attr_close, \ | |
1844 | .read = simple_attr_read, \ | |
1845 | .write = simple_attr_write, \ | |
1846 | }; | |
1847 | ||
1848 | static inline void __attribute__((format(printf, 1, 2))) | |
1849 | __simple_attr_check_format(const char *fmt, ...) | |
1850 | { | |
1851 | /* don't do anything, just let the compiler check the arguments; */ | |
1852 | } | |
1853 | ||
1854 | int simple_attr_open(struct inode *inode, struct file *file, | |
1855 | u64 (*get)(void *), void (*set)(void *, u64), | |
1856 | const char *fmt); | |
1857 | int simple_attr_close(struct inode *inode, struct file *file); | |
1858 | ssize_t simple_attr_read(struct file *file, char __user *buf, | |
1859 | size_t len, loff_t *ppos); | |
1860 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
1861 | size_t len, loff_t *ppos); | |
1862 | ||
1863 | ||
1da177e4 LT |
1864 | #ifdef CONFIG_SECURITY |
1865 | static inline char *alloc_secdata(void) | |
1866 | { | |
1867 | return (char *)get_zeroed_page(GFP_KERNEL); | |
1868 | } | |
1869 | ||
1870 | static inline void free_secdata(void *secdata) | |
1871 | { | |
1872 | free_page((unsigned long)secdata); | |
1873 | } | |
1874 | #else | |
1875 | static inline char *alloc_secdata(void) | |
1876 | { | |
1877 | return (char *)1; | |
1878 | } | |
1879 | ||
1880 | static inline void free_secdata(void *secdata) | |
1881 | { } | |
1882 | #endif /* CONFIG_SECURITY */ | |
1883 | ||
1884 | #endif /* __KERNEL__ */ | |
1885 | #endif /* _LINUX_FS_H */ |