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1 | #ifndef _LINUX_FS_H |
2 | #define _LINUX_FS_H |
3 | |
4 | |
5 | #include <linux/linkage.h> |
6 | #include <linux/wait.h> |
7 | #include <linux/kdev_t.h> |
8 | #include <linux/dcache.h> |
9 | #include <linux/path.h> |
10 | #include <linux/stat.h> |
11 | #include <linux/cache.h> |
12 | #include <linux/list.h> |
13 | #include <linux/list_lru.h> |
14 | #include <linux/llist.h> |
15 | #include <linux/radix-tree.h> |
16 | #include <linux/rbtree.h> |
17 | #include <linux/init.h> |
18 | #include <linux/pid.h> |
19 | #include <linux/bug.h> |
20 | #include <linux/mutex.h> |
21 | #include <linux/capability.h> |
22 | #include <linux/semaphore.h> |
23 | #include <linux/fiemap.h> |
24 | #include <linux/rculist_bl.h> |
25 | #include <linux/atomic.h> |
26 | #include <linux/shrinker.h> |
27 | #include <linux/migrate_mode.h> |
28 | #include <linux/uidgid.h> |
29 | #include <linux/lockdep.h> |
30 | #include <linux/percpu-rwsem.h> |
31 | #include <linux/blk_types.h> |
32 | |
33 | #include <asm/byteorder.h> |
34 | #include <uapi/linux/fs.h> |
35 | |
36 | struct export_operations; |
37 | struct hd_geometry; |
38 | struct iovec; |
39 | struct nameidata; |
40 | struct kiocb; |
41 | struct kobject; |
42 | struct pipe_inode_info; |
43 | struct poll_table_struct; |
44 | struct kstatfs; |
45 | struct vm_area_struct; |
46 | struct vfsmount; |
47 | struct cred; |
48 | struct swap_info_struct; |
49 | struct seq_file; |
50 | struct workqueue_struct; |
51 | |
52 | extern void __init inode_init(void); |
53 | extern void __init inode_init_early(void); |
54 | extern void __init files_init(unsigned long); |
55 | |
56 | extern struct files_stat_struct files_stat; |
57 | extern unsigned long get_max_files(void); |
58 | extern int sysctl_nr_open; |
59 | extern struct inodes_stat_t inodes_stat; |
60 | extern int leases_enable, lease_break_time; |
61 | extern int sysctl_protected_symlinks; |
62 | extern int sysctl_protected_hardlinks; |
63 | |
64 | struct buffer_head; |
65 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
66 | struct buffer_head *bh_result, int create); |
67 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
68 | ssize_t bytes, void *private); |
69 | |
70 | #define MAY_EXEC 0x00000001 |
71 | #define MAY_WRITE 0x00000002 |
72 | #define MAY_READ 0x00000004 |
73 | #define MAY_APPEND 0x00000008 |
74 | #define MAY_ACCESS 0x00000010 |
75 | #define MAY_OPEN 0x00000020 |
76 | #define MAY_CHDIR 0x00000040 |
77 | /* called from RCU mode, don't block */ |
78 | #define MAY_NOT_BLOCK 0x00000080 |
79 | |
80 | /* |
81 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
82 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
83 | */ |
84 | |
85 | /* file is open for reading */ |
86 | #define FMODE_READ ((__force fmode_t)0x1) |
87 | /* file is open for writing */ |
88 | #define FMODE_WRITE ((__force fmode_t)0x2) |
89 | /* file is seekable */ |
90 | #define FMODE_LSEEK ((__force fmode_t)0x4) |
91 | /* file can be accessed using pread */ |
92 | #define FMODE_PREAD ((__force fmode_t)0x8) |
93 | /* file can be accessed using pwrite */ |
94 | #define FMODE_PWRITE ((__force fmode_t)0x10) |
95 | /* File is opened for execution with sys_execve / sys_uselib */ |
96 | #define FMODE_EXEC ((__force fmode_t)0x20) |
97 | /* File is opened with O_NDELAY (only set for block devices) */ |
98 | #define FMODE_NDELAY ((__force fmode_t)0x40) |
99 | /* File is opened with O_EXCL (only set for block devices) */ |
100 | #define FMODE_EXCL ((__force fmode_t)0x80) |
101 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
102 | (specialy hack for floppy.c) */ |
103 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
104 | /* 32bit hashes as llseek() offset (for directories) */ |
105 | #define FMODE_32BITHASH ((__force fmode_t)0x200) |
106 | /* 64bit hashes as llseek() offset (for directories) */ |
107 | #define FMODE_64BITHASH ((__force fmode_t)0x400) |
108 | |
109 | /* |
110 | * Don't update ctime and mtime. |
111 | * |
112 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
113 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
114 | */ |
115 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
116 | |
117 | /* Expect random access pattern */ |
118 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
119 | |
120 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
121 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
122 | |
123 | /* File is opened with O_PATH; almost nothing can be done with it */ |
124 | #define FMODE_PATH ((__force fmode_t)0x4000) |
125 | |
126 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
127 | #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) |
128 | |
129 | /* |
130 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector |
131 | * that indicates that they should check the contents of the iovec are |
132 | * valid, but not check the memory that the iovec elements |
133 | * points too. |
134 | */ |
135 | #define CHECK_IOVEC_ONLY -1 |
136 | |
137 | /* |
138 | * The below are the various read and write types that we support. Some of |
139 | * them include behavioral modifiers that send information down to the |
140 | * block layer and IO scheduler. Terminology: |
141 | * |
142 | * The block layer uses device plugging to defer IO a little bit, in |
143 | * the hope that we will see more IO very shortly. This increases |
144 | * coalescing of adjacent IO and thus reduces the number of IOs we |
145 | * have to send to the device. It also allows for better queuing, |
146 | * if the IO isn't mergeable. If the caller is going to be waiting |
147 | * for the IO, then he must ensure that the device is unplugged so |
148 | * that the IO is dispatched to the driver. |
149 | * |
150 | * All IO is handled async in Linux. This is fine for background |
151 | * writes, but for reads or writes that someone waits for completion |
152 | * on, we want to notify the block layer and IO scheduler so that they |
153 | * know about it. That allows them to make better scheduling |
154 | * decisions. So when the below references 'sync' and 'async', it |
155 | * is referencing this priority hint. |
156 | * |
157 | * With that in mind, the available types are: |
158 | * |
159 | * READ A normal read operation. Device will be plugged. |
160 | * READ_SYNC A synchronous read. Device is not plugged, caller can |
161 | * immediately wait on this read without caring about |
162 | * unplugging. |
163 | * READA Used for read-ahead operations. Lower priority, and the |
164 | * block layer could (in theory) choose to ignore this |
165 | * request if it runs into resource problems. |
166 | * WRITE A normal async write. Device will be plugged. |
167 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
168 | * the hint that someone will be waiting on this IO |
169 | * shortly. The write equivalent of READ_SYNC. |
170 | * WRITE_ODIRECT Special case write for O_DIRECT only. |
171 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
172 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on |
173 | * non-volatile media on completion. |
174 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded |
175 | * by a cache flush and data is guaranteed to be on |
176 | * non-volatile media on completion. |
177 | * |
178 | */ |
179 | #define RW_MASK REQ_WRITE |
180 | #define RWA_MASK REQ_RAHEAD |
181 | |
182 | #define READ 0 |
183 | #define WRITE RW_MASK |
184 | #define READA RWA_MASK |
185 | #define KERNEL_READ (READ|REQ_KERNEL) |
186 | #define KERNEL_WRITE (WRITE|REQ_KERNEL) |
187 | |
188 | #define READ_SYNC (READ | REQ_SYNC) |
189 | #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
190 | #define WRITE_ODIRECT (WRITE | REQ_SYNC) |
191 | #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
192 | #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
193 | #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) |
194 | |
195 | /* |
196 | * Attribute flags. These should be or-ed together to figure out what |
197 | * has been changed! |
198 | */ |
199 | #define ATTR_MODE (1 << 0) |
200 | #define ATTR_UID (1 << 1) |
201 | #define ATTR_GID (1 << 2) |
202 | #define ATTR_SIZE (1 << 3) |
203 | #define ATTR_ATIME (1 << 4) |
204 | #define ATTR_MTIME (1 << 5) |
205 | #define ATTR_CTIME (1 << 6) |
206 | #define ATTR_ATIME_SET (1 << 7) |
207 | #define ATTR_MTIME_SET (1 << 8) |
208 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
209 | #define ATTR_ATTR_FLAG (1 << 10) |
210 | #define ATTR_KILL_SUID (1 << 11) |
211 | #define ATTR_KILL_SGID (1 << 12) |
212 | #define ATTR_FILE (1 << 13) |
213 | #define ATTR_KILL_PRIV (1 << 14) |
214 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
215 | #define ATTR_TIMES_SET (1 << 16) |
216 | |
217 | /* |
218 | * This is the Inode Attributes structure, used for notify_change(). It |
219 | * uses the above definitions as flags, to know which values have changed. |
220 | * Also, in this manner, a Filesystem can look at only the values it cares |
221 | * about. Basically, these are the attributes that the VFS layer can |
222 | * request to change from the FS layer. |
223 | * |
224 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
225 | */ |
226 | struct iattr { |
227 | unsigned int ia_valid; |
228 | umode_t ia_mode; |
229 | kuid_t ia_uid; |
230 | kgid_t ia_gid; |
231 | loff_t ia_size; |
232 | struct timespec ia_atime; |
233 | struct timespec ia_mtime; |
234 | struct timespec ia_ctime; |
235 | |
236 | /* |
237 | * Not an attribute, but an auxiliary info for filesystems wanting to |
238 | * implement an ftruncate() like method. NOTE: filesystem should |
239 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
240 | */ |
241 | struct file *ia_file; |
242 | }; |
243 | |
244 | /* |
245 | * Includes for diskquotas. |
246 | */ |
247 | #include <linux/quota.h> |
248 | |
249 | /** |
250 | * enum positive_aop_returns - aop return codes with specific semantics |
251 | * |
252 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
253 | * completed, that the page is still locked, and |
254 | * should be considered active. The VM uses this hint |
255 | * to return the page to the active list -- it won't |
256 | * be a candidate for writeback again in the near |
257 | * future. Other callers must be careful to unlock |
258 | * the page if they get this return. Returned by |
259 | * writepage(); |
260 | * |
261 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
262 | * unlocked it and the page might have been truncated. |
263 | * The caller should back up to acquiring a new page and |
264 | * trying again. The aop will be taking reasonable |
265 | * precautions not to livelock. If the caller held a page |
266 | * reference, it should drop it before retrying. Returned |
267 | * by readpage(). |
268 | * |
269 | * address_space_operation functions return these large constants to indicate |
270 | * special semantics to the caller. These are much larger than the bytes in a |
271 | * page to allow for functions that return the number of bytes operated on in a |
272 | * given page. |
273 | */ |
274 | |
275 | enum positive_aop_returns { |
276 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
277 | AOP_TRUNCATED_PAGE = 0x80001, |
278 | }; |
279 | |
280 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
281 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
282 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
283 | * helper code (eg buffer layer) |
284 | * to clear GFP_FS from alloc */ |
285 | |
286 | /* |
287 | * oh the beauties of C type declarations. |
288 | */ |
289 | struct page; |
290 | struct address_space; |
291 | struct writeback_control; |
292 | |
293 | struct iov_iter { |
294 | const struct iovec *iov; |
295 | unsigned long nr_segs; |
296 | size_t iov_offset; |
297 | size_t count; |
298 | }; |
299 | |
300 | size_t iov_iter_copy_from_user_atomic(struct page *page, |
301 | struct iov_iter *i, unsigned long offset, size_t bytes); |
302 | size_t iov_iter_copy_from_user(struct page *page, |
303 | struct iov_iter *i, unsigned long offset, size_t bytes); |
304 | void iov_iter_advance(struct iov_iter *i, size_t bytes); |
305 | int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); |
306 | size_t iov_iter_single_seg_count(const struct iov_iter *i); |
307 | |
308 | static inline void iov_iter_init(struct iov_iter *i, |
309 | const struct iovec *iov, unsigned long nr_segs, |
310 | size_t count, size_t written) |
311 | { |
312 | i->iov = iov; |
313 | i->nr_segs = nr_segs; |
314 | i->iov_offset = 0; |
315 | i->count = count + written; |
316 | |
317 | iov_iter_advance(i, written); |
318 | } |
319 | |
320 | static inline size_t iov_iter_count(struct iov_iter *i) |
321 | { |
322 | return i->count; |
323 | } |
324 | |
325 | /* |
326 | * "descriptor" for what we're up to with a read. |
327 | * This allows us to use the same read code yet |
328 | * have multiple different users of the data that |
329 | * we read from a file. |
330 | * |
331 | * The simplest case just copies the data to user |
332 | * mode. |
333 | */ |
334 | typedef struct { |
335 | size_t written; |
336 | size_t count; |
337 | union { |
338 | char __user *buf; |
339 | void *data; |
340 | } arg; |
341 | int error; |
342 | } read_descriptor_t; |
343 | |
344 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
345 | unsigned long, unsigned long); |
346 | |
347 | struct address_space_operations { |
348 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
349 | int (*readpage)(struct file *, struct page *); |
350 | |
351 | /* Write back some dirty pages from this mapping. */ |
352 | int (*writepages)(struct address_space *, struct writeback_control *); |
353 | |
354 | /* Set a page dirty. Return true if this dirtied it */ |
355 | int (*set_page_dirty)(struct page *page); |
356 | |
357 | int (*readpages)(struct file *filp, struct address_space *mapping, |
358 | struct list_head *pages, unsigned nr_pages); |
359 | |
360 | int (*write_begin)(struct file *, struct address_space *mapping, |
361 | loff_t pos, unsigned len, unsigned flags, |
362 | struct page **pagep, void **fsdata); |
363 | int (*write_end)(struct file *, struct address_space *mapping, |
364 | loff_t pos, unsigned len, unsigned copied, |
365 | struct page *page, void *fsdata); |
366 | |
367 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
368 | sector_t (*bmap)(struct address_space *, sector_t); |
369 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
370 | int (*releasepage) (struct page *, gfp_t); |
371 | void (*freepage)(struct page *); |
372 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
373 | loff_t offset, unsigned long nr_segs); |
374 | int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
375 | void **, unsigned long *); |
376 | /* |
377 | * migrate the contents of a page to the specified target. If |
378 | * migrate_mode is MIGRATE_ASYNC, it must not block. |
379 | */ |
380 | int (*migratepage) (struct address_space *, |
381 | struct page *, struct page *, enum migrate_mode); |
382 | int (*launder_page) (struct page *); |
383 | int (*is_partially_uptodate) (struct page *, read_descriptor_t *, |
384 | unsigned long); |
385 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
386 | int (*error_remove_page)(struct address_space *, struct page *); |
387 | |
388 | /* swapfile support */ |
389 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
390 | sector_t *span); |
391 | void (*swap_deactivate)(struct file *file); |
392 | }; |
393 | |
394 | extern const struct address_space_operations empty_aops; |
395 | |
396 | /* |
397 | * pagecache_write_begin/pagecache_write_end must be used by general code |
398 | * to write into the pagecache. |
399 | */ |
400 | int pagecache_write_begin(struct file *, struct address_space *mapping, |
401 | loff_t pos, unsigned len, unsigned flags, |
402 | struct page **pagep, void **fsdata); |
403 | |
404 | int pagecache_write_end(struct file *, struct address_space *mapping, |
405 | loff_t pos, unsigned len, unsigned copied, |
406 | struct page *page, void *fsdata); |
407 | |
408 | struct backing_dev_info; |
409 | struct address_space { |
410 | struct inode *host; /* owner: inode, block_device */ |
411 | struct radix_tree_root page_tree; /* radix tree of all pages */ |
412 | spinlock_t tree_lock; /* and lock protecting it */ |
413 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
414 | struct rb_root i_mmap; /* tree of private and shared mappings */ |
415 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ |
416 | struct mutex i_mmap_mutex; /* protect tree, count, list */ |
417 | /* Protected by tree_lock together with the radix tree */ |
418 | unsigned long nrpages; /* number of total pages */ |
419 | pgoff_t writeback_index;/* writeback starts here */ |
420 | const struct address_space_operations *a_ops; /* methods */ |
421 | unsigned long flags; /* error bits/gfp mask */ |
422 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ |
423 | spinlock_t private_lock; /* for use by the address_space */ |
424 | struct list_head private_list; /* ditto */ |
425 | void *private_data; /* ditto */ |
426 | } __attribute__((aligned(sizeof(long)))); |
427 | /* |
428 | * On most architectures that alignment is already the case; but |
429 | * must be enforced here for CRIS, to let the least significant bit |
430 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
431 | */ |
432 | struct request_queue; |
433 | |
434 | struct block_device { |
435 | dev_t bd_dev; /* not a kdev_t - it's a search key */ |
436 | int bd_openers; |
437 | struct inode * bd_inode; /* will die */ |
438 | struct super_block * bd_super; |
439 | struct mutex bd_mutex; /* open/close mutex */ |
440 | struct list_head bd_inodes; |
441 | void * bd_claiming; |
442 | void * bd_holder; |
443 | int bd_holders; |
444 | bool bd_write_holder; |
445 | #ifdef CONFIG_SYSFS |
446 | struct list_head bd_holder_disks; |
447 | #endif |
448 | struct block_device * bd_contains; |
449 | unsigned bd_block_size; |
450 | struct hd_struct * bd_part; |
451 | /* number of times partitions within this device have been opened. */ |
452 | unsigned bd_part_count; |
453 | int bd_invalidated; |
454 | struct gendisk * bd_disk; |
455 | struct request_queue * bd_queue; |
456 | struct list_head bd_list; |
457 | /* |
458 | * Private data. You must have bd_claim'ed the block_device |
459 | * to use this. NOTE: bd_claim allows an owner to claim |
460 | * the same device multiple times, the owner must take special |
461 | * care to not mess up bd_private for that case. |
462 | */ |
463 | unsigned long bd_private; |
464 | |
465 | /* The counter of freeze processes */ |
466 | int bd_fsfreeze_count; |
467 | /* Mutex for freeze */ |
468 | struct mutex bd_fsfreeze_mutex; |
469 | }; |
470 | |
471 | /* |
472 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
473 | * radix trees |
474 | */ |
475 | #define PAGECACHE_TAG_DIRTY 0 |
476 | #define PAGECACHE_TAG_WRITEBACK 1 |
477 | #define PAGECACHE_TAG_TOWRITE 2 |
478 | |
479 | int mapping_tagged(struct address_space *mapping, int tag); |
480 | |
481 | /* |
482 | * Might pages of this file be mapped into userspace? |
483 | */ |
484 | static inline int mapping_mapped(struct address_space *mapping) |
485 | { |
486 | return !RB_EMPTY_ROOT(&mapping->i_mmap) || |
487 | !list_empty(&mapping->i_mmap_nonlinear); |
488 | } |
489 | |
490 | /* |
491 | * Might pages of this file have been modified in userspace? |
492 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
493 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
494 | * writing i.e. vma may be mprotected writable even if now readonly. |
495 | */ |
496 | static inline int mapping_writably_mapped(struct address_space *mapping) |
497 | { |
498 | return mapping->i_mmap_writable != 0; |
499 | } |
500 | |
501 | /* |
502 | * Use sequence counter to get consistent i_size on 32-bit processors. |
503 | */ |
504 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
505 | #include <linux/seqlock.h> |
506 | #define __NEED_I_SIZE_ORDERED |
507 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
508 | #else |
509 | #define i_size_ordered_init(inode) do { } while (0) |
510 | #endif |
511 | |
512 | struct posix_acl; |
513 | #define ACL_NOT_CACHED ((void *)(-1)) |
514 | |
515 | #define IOP_FASTPERM 0x0001 |
516 | #define IOP_LOOKUP 0x0002 |
517 | #define IOP_NOFOLLOW 0x0004 |
518 | |
519 | /* |
520 | * Keep mostly read-only and often accessed (especially for |
521 | * the RCU path lookup and 'stat' data) fields at the beginning |
522 | * of the 'struct inode' |
523 | */ |
524 | struct inode { |
525 | umode_t i_mode; |
526 | unsigned short i_opflags; |
527 | kuid_t i_uid; |
528 | kgid_t i_gid; |
529 | unsigned int i_flags; |
530 | |
531 | #ifdef CONFIG_FS_POSIX_ACL |
532 | struct posix_acl *i_acl; |
533 | struct posix_acl *i_default_acl; |
534 | #endif |
535 | |
536 | const struct inode_operations *i_op; |
537 | struct super_block *i_sb; |
538 | struct address_space *i_mapping; |
539 | |
540 | #ifdef CONFIG_SECURITY |
541 | void *i_security; |
542 | #endif |
543 | |
544 | /* Stat data, not accessed from path walking */ |
545 | unsigned long i_ino; |
546 | /* |
547 | * Filesystems may only read i_nlink directly. They shall use the |
548 | * following functions for modification: |
549 | * |
550 | * (set|clear|inc|drop)_nlink |
551 | * inode_(inc|dec)_link_count |
552 | */ |
553 | union { |
554 | const unsigned int i_nlink; |
555 | unsigned int __i_nlink; |
556 | }; |
557 | dev_t i_rdev; |
558 | loff_t i_size; |
559 | struct timespec i_atime; |
560 | struct timespec i_mtime; |
561 | struct timespec i_ctime; |
562 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
563 | unsigned short i_bytes; |
564 | unsigned int i_blkbits; |
565 | blkcnt_t i_blocks; |
566 | |
567 | #ifdef __NEED_I_SIZE_ORDERED |
568 | seqcount_t i_size_seqcount; |
569 | #endif |
570 | |
571 | /* Misc */ |
572 | unsigned long i_state; |
573 | struct mutex i_mutex; |
574 | |
575 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
576 | |
577 | struct hlist_node i_hash; |
578 | struct list_head i_wb_list; /* backing dev IO list */ |
579 | struct list_head i_lru; /* inode LRU list */ |
580 | struct list_head i_sb_list; |
581 | union { |
582 | struct hlist_head i_dentry; |
583 | struct rcu_head i_rcu; |
584 | }; |
585 | u64 i_version; |
586 | atomic_t i_count; |
587 | atomic_t i_dio_count; |
588 | atomic_t i_writecount; |
589 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
590 | struct file_lock *i_flock; |
591 | struct address_space i_data; |
592 | #ifdef CONFIG_QUOTA |
593 | struct dquot *i_dquot[MAXQUOTAS]; |
594 | #endif |
595 | struct list_head i_devices; |
596 | union { |
597 | struct pipe_inode_info *i_pipe; |
598 | struct block_device *i_bdev; |
599 | struct cdev *i_cdev; |
600 | }; |
601 | |
602 | __u32 i_generation; |
603 | |
604 | #ifdef CONFIG_FSNOTIFY |
605 | __u32 i_fsnotify_mask; /* all events this inode cares about */ |
606 | struct hlist_head i_fsnotify_marks; |
607 | #endif |
608 | |
609 | #ifdef CONFIG_IMA |
610 | atomic_t i_readcount; /* struct files open RO */ |
611 | #endif |
612 | void *i_private; /* fs or device private pointer */ |
613 | }; |
614 | |
615 | static inline int inode_unhashed(struct inode *inode) |
616 | { |
617 | return hlist_unhashed(&inode->i_hash); |
618 | } |
619 | |
620 | /* |
621 | * inode->i_mutex nesting subclasses for the lock validator: |
622 | * |
623 | * 0: the object of the current VFS operation |
624 | * 1: parent |
625 | * 2: child/target |
626 | * 3: quota file |
627 | * |
628 | * The locking order between these classes is |
629 | * parent -> child -> normal -> xattr -> quota |
630 | */ |
631 | enum inode_i_mutex_lock_class |
632 | { |
633 | I_MUTEX_NORMAL, |
634 | I_MUTEX_PARENT, |
635 | I_MUTEX_CHILD, |
636 | I_MUTEX_XATTR, |
637 | I_MUTEX_QUOTA |
638 | }; |
639 | |
640 | /* |
641 | * NOTE: in a 32bit arch with a preemptable kernel and |
642 | * an UP compile the i_size_read/write must be atomic |
643 | * with respect to the local cpu (unlike with preempt disabled), |
644 | * but they don't need to be atomic with respect to other cpus like in |
645 | * true SMP (so they need either to either locally disable irq around |
646 | * the read or for example on x86 they can be still implemented as a |
647 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
648 | * and 64bit archs it makes no difference if preempt is enabled or not. |
649 | */ |
650 | static inline loff_t i_size_read(const struct inode *inode) |
651 | { |
652 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
653 | loff_t i_size; |
654 | unsigned int seq; |
655 | |
656 | do { |
657 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
658 | i_size = inode->i_size; |
659 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
660 | return i_size; |
661 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
662 | loff_t i_size; |
663 | |
664 | preempt_disable(); |
665 | i_size = inode->i_size; |
666 | preempt_enable(); |
667 | return i_size; |
668 | #else |
669 | return inode->i_size; |
670 | #endif |
671 | } |
672 | |
673 | /* |
674 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
675 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
676 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
677 | */ |
678 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
679 | { |
680 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
681 | preempt_disable(); |
682 | write_seqcount_begin(&inode->i_size_seqcount); |
683 | inode->i_size = i_size; |
684 | write_seqcount_end(&inode->i_size_seqcount); |
685 | preempt_enable(); |
686 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
687 | preempt_disable(); |
688 | inode->i_size = i_size; |
689 | preempt_enable(); |
690 | #else |
691 | inode->i_size = i_size; |
692 | #endif |
693 | } |
694 | |
695 | /* Helper functions so that in most cases filesystems will |
696 | * not need to deal directly with kuid_t and kgid_t and can |
697 | * instead deal with the raw numeric values that are stored |
698 | * in the filesystem. |
699 | */ |
700 | static inline uid_t i_uid_read(const struct inode *inode) |
701 | { |
702 | return from_kuid(&init_user_ns, inode->i_uid); |
703 | } |
704 | |
705 | static inline gid_t i_gid_read(const struct inode *inode) |
706 | { |
707 | return from_kgid(&init_user_ns, inode->i_gid); |
708 | } |
709 | |
710 | static inline void i_uid_write(struct inode *inode, uid_t uid) |
711 | { |
712 | inode->i_uid = make_kuid(&init_user_ns, uid); |
713 | } |
714 | |
715 | static inline void i_gid_write(struct inode *inode, gid_t gid) |
716 | { |
717 | inode->i_gid = make_kgid(&init_user_ns, gid); |
718 | } |
719 | |
720 | static inline unsigned iminor(const struct inode *inode) |
721 | { |
722 | return MINOR(inode->i_rdev); |
723 | } |
724 | |
725 | static inline unsigned imajor(const struct inode *inode) |
726 | { |
727 | return MAJOR(inode->i_rdev); |
728 | } |
729 | |
730 | extern struct block_device *I_BDEV(struct inode *inode); |
731 | |
732 | struct fown_struct { |
733 | rwlock_t lock; /* protects pid, uid, euid fields */ |
734 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
735 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ |
736 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
737 | int signum; /* posix.1b rt signal to be delivered on IO */ |
738 | }; |
739 | |
740 | /* |
741 | * Track a single file's readahead state |
742 | */ |
743 | struct file_ra_state { |
744 | pgoff_t start; /* where readahead started */ |
745 | unsigned int size; /* # of readahead pages */ |
746 | unsigned int async_size; /* do asynchronous readahead when |
747 | there are only # of pages ahead */ |
748 | |
749 | unsigned int ra_pages; /* Maximum readahead window */ |
750 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
751 | loff_t prev_pos; /* Cache last read() position */ |
752 | }; |
753 | |
754 | /* |
755 | * Check if @index falls in the readahead windows. |
756 | */ |
757 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
758 | { |
759 | return (index >= ra->start && |
760 | index < ra->start + ra->size); |
761 | } |
762 | |
763 | #define FILE_MNT_WRITE_TAKEN 1 |
764 | #define FILE_MNT_WRITE_RELEASED 2 |
765 | |
766 | struct file { |
767 | /* |
768 | * fu_list becomes invalid after file_free is called and queued via |
769 | * fu_rcuhead for RCU freeing |
770 | */ |
771 | union { |
772 | struct list_head fu_list; |
773 | struct llist_node fu_llist; |
774 | struct rcu_head fu_rcuhead; |
775 | } f_u; |
776 | struct path f_path; |
777 | #define f_dentry f_path.dentry |
778 | struct inode *f_inode; /* cached value */ |
779 | const struct file_operations *f_op; |
780 | |
781 | /* |
782 | * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR. |
783 | * Must not be taken from IRQ context. |
784 | */ |
785 | spinlock_t f_lock; |
786 | #ifdef CONFIG_SMP |
787 | int f_sb_list_cpu; |
788 | #endif |
789 | atomic_long_t f_count; |
790 | unsigned int f_flags; |
791 | fmode_t f_mode; |
792 | loff_t f_pos; |
793 | struct fown_struct f_owner; |
794 | const struct cred *f_cred; |
795 | struct file_ra_state f_ra; |
796 | |
797 | u64 f_version; |
798 | #ifdef CONFIG_SECURITY |
799 | void *f_security; |
800 | #endif |
801 | /* needed for tty driver, and maybe others */ |
802 | void *private_data; |
803 | |
804 | #ifdef CONFIG_EPOLL |
805 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
806 | struct list_head f_ep_links; |
807 | struct list_head f_tfile_llink; |
808 | #endif /* #ifdef CONFIG_EPOLL */ |
809 | struct address_space *f_mapping; |
810 | #ifdef CONFIG_DEBUG_WRITECOUNT |
811 | unsigned long f_mnt_write_state; |
812 | #endif |
813 | }; |
814 | |
815 | struct file_handle { |
816 | __u32 handle_bytes; |
817 | int handle_type; |
818 | /* file identifier */ |
819 | unsigned char f_handle[0]; |
820 | }; |
821 | |
822 | static inline struct file *get_file(struct file *f) |
823 | { |
824 | atomic_long_inc(&f->f_count); |
825 | return f; |
826 | } |
827 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
828 | #define file_count(x) atomic_long_read(&(x)->f_count) |
829 | |
830 | #ifdef CONFIG_DEBUG_WRITECOUNT |
831 | static inline void file_take_write(struct file *f) |
832 | { |
833 | WARN_ON(f->f_mnt_write_state != 0); |
834 | f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; |
835 | } |
836 | static inline void file_release_write(struct file *f) |
837 | { |
838 | f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; |
839 | } |
840 | static inline void file_reset_write(struct file *f) |
841 | { |
842 | f->f_mnt_write_state = 0; |
843 | } |
844 | static inline void file_check_state(struct file *f) |
845 | { |
846 | /* |
847 | * At this point, either both or neither of these bits |
848 | * should be set. |
849 | */ |
850 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); |
851 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); |
852 | } |
853 | static inline int file_check_writeable(struct file *f) |
854 | { |
855 | if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) |
856 | return 0; |
857 | printk(KERN_WARNING "writeable file with no " |
858 | "mnt_want_write()\n"); |
859 | WARN_ON(1); |
860 | return -EINVAL; |
861 | } |
862 | #else /* !CONFIG_DEBUG_WRITECOUNT */ |
863 | static inline void file_take_write(struct file *filp) {} |
864 | static inline void file_release_write(struct file *filp) {} |
865 | static inline void file_reset_write(struct file *filp) {} |
866 | static inline void file_check_state(struct file *filp) {} |
867 | static inline int file_check_writeable(struct file *filp) |
868 | { |
869 | return 0; |
870 | } |
871 | #endif /* CONFIG_DEBUG_WRITECOUNT */ |
872 | |
873 | #define MAX_NON_LFS ((1UL<<31) - 1) |
874 | |
875 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
876 | limits, otherwise bad things can happen in VM. */ |
877 | #if BITS_PER_LONG==32 |
878 | #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
879 | #elif BITS_PER_LONG==64 |
880 | #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) |
881 | #endif |
882 | |
883 | #define FL_POSIX 1 |
884 | #define FL_FLOCK 2 |
885 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
886 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
887 | #define FL_LEASE 32 /* lease held on this file */ |
888 | #define FL_CLOSE 64 /* unlock on close */ |
889 | #define FL_SLEEP 128 /* A blocking lock */ |
890 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
891 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
892 | |
893 | /* |
894 | * Special return value from posix_lock_file() and vfs_lock_file() for |
895 | * asynchronous locking. |
896 | */ |
897 | #define FILE_LOCK_DEFERRED 1 |
898 | |
899 | /* |
900 | * The POSIX file lock owner is determined by |
901 | * the "struct files_struct" in the thread group |
902 | * (or NULL for no owner - BSD locks). |
903 | * |
904 | * Lockd stuffs a "host" pointer into this. |
905 | */ |
906 | typedef struct files_struct *fl_owner_t; |
907 | |
908 | struct file_lock_operations { |
909 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
910 | void (*fl_release_private)(struct file_lock *); |
911 | }; |
912 | |
913 | struct lock_manager_operations { |
914 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
915 | unsigned long (*lm_owner_key)(struct file_lock *); |
916 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
917 | int (*lm_grant)(struct file_lock *, struct file_lock *, int); |
918 | void (*lm_break)(struct file_lock *); |
919 | int (*lm_change)(struct file_lock **, int); |
920 | }; |
921 | |
922 | struct lock_manager { |
923 | struct list_head list; |
924 | }; |
925 | |
926 | struct net; |
927 | void locks_start_grace(struct net *, struct lock_manager *); |
928 | void locks_end_grace(struct lock_manager *); |
929 | int locks_in_grace(struct net *); |
930 | |
931 | /* that will die - we need it for nfs_lock_info */ |
932 | #include <linux/nfs_fs_i.h> |
933 | |
934 | /* |
935 | * struct file_lock represents a generic "file lock". It's used to represent |
936 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to |
937 | * note that the same struct is used to represent both a request for a lock and |
938 | * the lock itself, but the same object is never used for both. |
939 | * |
940 | * FIXME: should we create a separate "struct lock_request" to help distinguish |
941 | * these two uses? |
942 | * |
943 | * The i_flock list is ordered by: |
944 | * |
945 | * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX |
946 | * 2) lock owner |
947 | * 3) lock range start |
948 | * 4) lock range end |
949 | * |
950 | * Obviously, the last two criteria only matter for POSIX locks. |
951 | */ |
952 | struct file_lock { |
953 | struct file_lock *fl_next; /* singly linked list for this inode */ |
954 | struct hlist_node fl_link; /* node in global lists */ |
955 | struct list_head fl_block; /* circular list of blocked processes */ |
956 | fl_owner_t fl_owner; |
957 | unsigned int fl_flags; |
958 | unsigned char fl_type; |
959 | unsigned int fl_pid; |
960 | int fl_link_cpu; /* what cpu's list is this on? */ |
961 | struct pid *fl_nspid; |
962 | wait_queue_head_t fl_wait; |
963 | struct file *fl_file; |
964 | loff_t fl_start; |
965 | loff_t fl_end; |
966 | |
967 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
968 | /* for lease breaks: */ |
969 | unsigned long fl_break_time; |
970 | unsigned long fl_downgrade_time; |
971 | |
972 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
973 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
974 | union { |
975 | struct nfs_lock_info nfs_fl; |
976 | struct nfs4_lock_info nfs4_fl; |
977 | struct { |
978 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
979 | int state; /* state of grant or error if -ve */ |
980 | } afs; |
981 | } fl_u; |
982 | }; |
983 | |
984 | /* The following constant reflects the upper bound of the file/locking space */ |
985 | #ifndef OFFSET_MAX |
986 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
987 | #define OFFSET_MAX INT_LIMIT(loff_t) |
988 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
989 | #endif |
990 | |
991 | #include <linux/fcntl.h> |
992 | |
993 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
994 | |
995 | #ifdef CONFIG_FILE_LOCKING |
996 | extern int fcntl_getlk(struct file *, struct flock __user *); |
997 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
998 | struct flock __user *); |
999 | |
1000 | #if BITS_PER_LONG == 32 |
1001 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); |
1002 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1003 | struct flock64 __user *); |
1004 | #endif |
1005 | |
1006 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1007 | extern int fcntl_getlease(struct file *filp); |
1008 | |
1009 | /* fs/locks.c */ |
1010 | void locks_free_lock(struct file_lock *fl); |
1011 | extern void locks_init_lock(struct file_lock *); |
1012 | extern struct file_lock * locks_alloc_lock(void); |
1013 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
1014 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
1015 | extern void locks_remove_posix(struct file *, fl_owner_t); |
1016 | extern void locks_remove_flock(struct file *); |
1017 | extern void locks_release_private(struct file_lock *); |
1018 | extern void posix_test_lock(struct file *, struct file_lock *); |
1019 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
1020 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
1021 | extern int posix_unblock_lock(struct file_lock *); |
1022 | extern int vfs_test_lock(struct file *, struct file_lock *); |
1023 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
1024 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
1025 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
1026 | extern int __break_lease(struct inode *inode, unsigned int flags); |
1027 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
1028 | extern int generic_setlease(struct file *, long, struct file_lock **); |
1029 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
1030 | extern int lease_modify(struct file_lock **, int); |
1031 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
1032 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
1033 | #else /* !CONFIG_FILE_LOCKING */ |
1034 | static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
1035 | { |
1036 | return -EINVAL; |
1037 | } |
1038 | |
1039 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
1040 | unsigned int cmd, struct flock __user *user) |
1041 | { |
1042 | return -EACCES; |
1043 | } |
1044 | |
1045 | #if BITS_PER_LONG == 32 |
1046 | static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
1047 | { |
1048 | return -EINVAL; |
1049 | } |
1050 | |
1051 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
1052 | unsigned int cmd, struct flock64 __user *user) |
1053 | { |
1054 | return -EACCES; |
1055 | } |
1056 | #endif |
1057 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1058 | { |
1059 | return 0; |
1060 | } |
1061 | |
1062 | static inline int fcntl_getlease(struct file *filp) |
1063 | { |
1064 | return 0; |
1065 | } |
1066 | |
1067 | static inline void locks_init_lock(struct file_lock *fl) |
1068 | { |
1069 | return; |
1070 | } |
1071 | |
1072 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
1073 | { |
1074 | return; |
1075 | } |
1076 | |
1077 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
1078 | { |
1079 | return; |
1080 | } |
1081 | |
1082 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
1083 | { |
1084 | return; |
1085 | } |
1086 | |
1087 | static inline void locks_remove_flock(struct file *filp) |
1088 | { |
1089 | return; |
1090 | } |
1091 | |
1092 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
1093 | { |
1094 | return; |
1095 | } |
1096 | |
1097 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
1098 | struct file_lock *conflock) |
1099 | { |
1100 | return -ENOLCK; |
1101 | } |
1102 | |
1103 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) |
1104 | { |
1105 | return -ENOLCK; |
1106 | } |
1107 | |
1108 | static inline int posix_unblock_lock(struct file_lock *waiter) |
1109 | { |
1110 | return -ENOENT; |
1111 | } |
1112 | |
1113 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
1114 | { |
1115 | return 0; |
1116 | } |
1117 | |
1118 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
1119 | struct file_lock *fl, struct file_lock *conf) |
1120 | { |
1121 | return -ENOLCK; |
1122 | } |
1123 | |
1124 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
1125 | { |
1126 | return 0; |
1127 | } |
1128 | |
1129 | static inline int flock_lock_file_wait(struct file *filp, |
1130 | struct file_lock *request) |
1131 | { |
1132 | return -ENOLCK; |
1133 | } |
1134 | |
1135 | static inline int __break_lease(struct inode *inode, unsigned int mode) |
1136 | { |
1137 | return 0; |
1138 | } |
1139 | |
1140 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
1141 | { |
1142 | return; |
1143 | } |
1144 | |
1145 | static inline int generic_setlease(struct file *filp, long arg, |
1146 | struct file_lock **flp) |
1147 | { |
1148 | return -EINVAL; |
1149 | } |
1150 | |
1151 | static inline int vfs_setlease(struct file *filp, long arg, |
1152 | struct file_lock **lease) |
1153 | { |
1154 | return -EINVAL; |
1155 | } |
1156 | |
1157 | static inline int lease_modify(struct file_lock **before, int arg) |
1158 | { |
1159 | return -EINVAL; |
1160 | } |
1161 | |
1162 | static inline int lock_may_read(struct inode *inode, loff_t start, |
1163 | unsigned long len) |
1164 | { |
1165 | return 1; |
1166 | } |
1167 | |
1168 | static inline int lock_may_write(struct inode *inode, loff_t start, |
1169 | unsigned long len) |
1170 | { |
1171 | return 1; |
1172 | } |
1173 | #endif /* !CONFIG_FILE_LOCKING */ |
1174 | |
1175 | |
1176 | struct fasync_struct { |
1177 | spinlock_t fa_lock; |
1178 | int magic; |
1179 | int fa_fd; |
1180 | struct fasync_struct *fa_next; /* singly linked list */ |
1181 | struct file *fa_file; |
1182 | struct rcu_head fa_rcu; |
1183 | }; |
1184 | |
1185 | #define FASYNC_MAGIC 0x4601 |
1186 | |
1187 | /* SMP safe fasync helpers: */ |
1188 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
1189 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1190 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
1191 | extern struct fasync_struct *fasync_alloc(void); |
1192 | extern void fasync_free(struct fasync_struct *); |
1193 | |
1194 | /* can be called from interrupts */ |
1195 | extern void kill_fasync(struct fasync_struct **, int, int); |
1196 | |
1197 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1198 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1199 | extern void f_delown(struct file *filp); |
1200 | extern pid_t f_getown(struct file *filp); |
1201 | extern int send_sigurg(struct fown_struct *fown); |
1202 | |
1203 | struct mm_struct; |
1204 | |
1205 | /* |
1206 | * Umount options |
1207 | */ |
1208 | |
1209 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
1210 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
1211 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
1212 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1213 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
1214 | |
1215 | extern struct list_head super_blocks; |
1216 | extern spinlock_t sb_lock; |
1217 | |
1218 | /* Possible states of 'frozen' field */ |
1219 | enum { |
1220 | SB_UNFROZEN = 0, /* FS is unfrozen */ |
1221 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ |
1222 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1223 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop |
1224 | * internal threads if needed) */ |
1225 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ |
1226 | }; |
1227 | |
1228 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) |
1229 | |
1230 | struct sb_writers { |
1231 | /* Counters for counting writers at each level */ |
1232 | struct percpu_counter counter[SB_FREEZE_LEVELS]; |
1233 | wait_queue_head_t wait; /* queue for waiting for |
1234 | writers / faults to finish */ |
1235 | int frozen; /* Is sb frozen? */ |
1236 | wait_queue_head_t wait_unfrozen; /* queue for waiting for |
1237 | sb to be thawed */ |
1238 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1239 | struct lockdep_map lock_map[SB_FREEZE_LEVELS]; |
1240 | #endif |
1241 | }; |
1242 | |
1243 | struct super_block { |
1244 | struct list_head s_list; /* Keep this first */ |
1245 | dev_t s_dev; /* search index; _not_ kdev_t */ |
1246 | unsigned char s_blocksize_bits; |
1247 | unsigned long s_blocksize; |
1248 | loff_t s_maxbytes; /* Max file size */ |
1249 | struct file_system_type *s_type; |
1250 | const struct super_operations *s_op; |
1251 | const struct dquot_operations *dq_op; |
1252 | const struct quotactl_ops *s_qcop; |
1253 | const struct export_operations *s_export_op; |
1254 | unsigned long s_flags; |
1255 | unsigned long s_magic; |
1256 | struct dentry *s_root; |
1257 | struct rw_semaphore s_umount; |
1258 | int s_count; |
1259 | atomic_t s_active; |
1260 | #ifdef CONFIG_SECURITY |
1261 | void *s_security; |
1262 | #endif |
1263 | const struct xattr_handler **s_xattr; |
1264 | |
1265 | struct list_head s_inodes; /* all inodes */ |
1266 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
1267 | #ifdef CONFIG_SMP |
1268 | struct list_head __percpu *s_files; |
1269 | #else |
1270 | struct list_head s_files; |
1271 | #endif |
1272 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1273 | struct block_device *s_bdev; |
1274 | struct backing_dev_info *s_bdi; |
1275 | struct mtd_info *s_mtd; |
1276 | struct hlist_node s_instances; |
1277 | struct quota_info s_dquot; /* Diskquota specific options */ |
1278 | |
1279 | struct sb_writers s_writers; |
1280 | |
1281 | char s_id[32]; /* Informational name */ |
1282 | u8 s_uuid[16]; /* UUID */ |
1283 | |
1284 | void *s_fs_info; /* Filesystem private info */ |
1285 | unsigned int s_max_links; |
1286 | fmode_t s_mode; |
1287 | |
1288 | /* Granularity of c/m/atime in ns. |
1289 | Cannot be worse than a second */ |
1290 | u32 s_time_gran; |
1291 | |
1292 | /* |
1293 | * The next field is for VFS *only*. No filesystems have any business |
1294 | * even looking at it. You had been warned. |
1295 | */ |
1296 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1297 | |
1298 | /* |
1299 | * Filesystem subtype. If non-empty the filesystem type field |
1300 | * in /proc/mounts will be "type.subtype" |
1301 | */ |
1302 | char *s_subtype; |
1303 | |
1304 | /* |
1305 | * Saved mount options for lazy filesystems using |
1306 | * generic_show_options() |
1307 | */ |
1308 | char __rcu *s_options; |
1309 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
1310 | |
1311 | /* |
1312 | * Saved pool identifier for cleancache (-1 means none) |
1313 | */ |
1314 | int cleancache_poolid; |
1315 | |
1316 | struct shrinker s_shrink; /* per-sb shrinker handle */ |
1317 | |
1318 | /* Number of inodes with nlink == 0 but still referenced */ |
1319 | atomic_long_t s_remove_count; |
1320 | |
1321 | /* Being remounted read-only */ |
1322 | int s_readonly_remount; |
1323 | |
1324 | /* AIO completions deferred from interrupt context */ |
1325 | struct workqueue_struct *s_dio_done_wq; |
1326 | |
1327 | /* |
1328 | * Keep the lru lists last in the structure so they always sit on their |
1329 | * own individual cachelines. |
1330 | */ |
1331 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; |
1332 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; |
1333 | }; |
1334 | |
1335 | extern struct timespec current_fs_time(struct super_block *sb); |
1336 | |
1337 | /* |
1338 | * Snapshotting support. |
1339 | */ |
1340 | |
1341 | void __sb_end_write(struct super_block *sb, int level); |
1342 | int __sb_start_write(struct super_block *sb, int level, bool wait); |
1343 | |
1344 | /** |
1345 | * sb_end_write - drop write access to a superblock |
1346 | * @sb: the super we wrote to |
1347 | * |
1348 | * Decrement number of writers to the filesystem. Wake up possible waiters |
1349 | * wanting to freeze the filesystem. |
1350 | */ |
1351 | static inline void sb_end_write(struct super_block *sb) |
1352 | { |
1353 | __sb_end_write(sb, SB_FREEZE_WRITE); |
1354 | } |
1355 | |
1356 | /** |
1357 | * sb_end_pagefault - drop write access to a superblock from a page fault |
1358 | * @sb: the super we wrote to |
1359 | * |
1360 | * Decrement number of processes handling write page fault to the filesystem. |
1361 | * Wake up possible waiters wanting to freeze the filesystem. |
1362 | */ |
1363 | static inline void sb_end_pagefault(struct super_block *sb) |
1364 | { |
1365 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); |
1366 | } |
1367 | |
1368 | /** |
1369 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes |
1370 | * @sb: the super we wrote to |
1371 | * |
1372 | * Decrement fs-internal number of writers to the filesystem. Wake up possible |
1373 | * waiters wanting to freeze the filesystem. |
1374 | */ |
1375 | static inline void sb_end_intwrite(struct super_block *sb) |
1376 | { |
1377 | __sb_end_write(sb, SB_FREEZE_FS); |
1378 | } |
1379 | |
1380 | /** |
1381 | * sb_start_write - get write access to a superblock |
1382 | * @sb: the super we write to |
1383 | * |
1384 | * When a process wants to write data or metadata to a file system (i.e. dirty |
1385 | * a page or an inode), it should embed the operation in a sb_start_write() - |
1386 | * sb_end_write() pair to get exclusion against file system freezing. This |
1387 | * function increments number of writers preventing freezing. If the file |
1388 | * system is already frozen, the function waits until the file system is |
1389 | * thawed. |
1390 | * |
1391 | * Since freeze protection behaves as a lock, users have to preserve |
1392 | * ordering of freeze protection and other filesystem locks. Generally, |
1393 | * freeze protection should be the outermost lock. In particular, we have: |
1394 | * |
1395 | * sb_start_write |
1396 | * -> i_mutex (write path, truncate, directory ops, ...) |
1397 | * -> s_umount (freeze_super, thaw_super) |
1398 | */ |
1399 | static inline void sb_start_write(struct super_block *sb) |
1400 | { |
1401 | __sb_start_write(sb, SB_FREEZE_WRITE, true); |
1402 | } |
1403 | |
1404 | static inline int sb_start_write_trylock(struct super_block *sb) |
1405 | { |
1406 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); |
1407 | } |
1408 | |
1409 | /** |
1410 | * sb_start_pagefault - get write access to a superblock from a page fault |
1411 | * @sb: the super we write to |
1412 | * |
1413 | * When a process starts handling write page fault, it should embed the |
1414 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get |
1415 | * exclusion against file system freezing. This is needed since the page fault |
1416 | * is going to dirty a page. This function increments number of running page |
1417 | * faults preventing freezing. If the file system is already frozen, the |
1418 | * function waits until the file system is thawed. |
1419 | * |
1420 | * Since page fault freeze protection behaves as a lock, users have to preserve |
1421 | * ordering of freeze protection and other filesystem locks. It is advised to |
1422 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault |
1423 | * handling code implies lock dependency: |
1424 | * |
1425 | * mmap_sem |
1426 | * -> sb_start_pagefault |
1427 | */ |
1428 | static inline void sb_start_pagefault(struct super_block *sb) |
1429 | { |
1430 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); |
1431 | } |
1432 | |
1433 | /* |
1434 | * sb_start_intwrite - get write access to a superblock for internal fs purposes |
1435 | * @sb: the super we write to |
1436 | * |
1437 | * This is the third level of protection against filesystem freezing. It is |
1438 | * free for use by a filesystem. The only requirement is that it must rank |
1439 | * below sb_start_pagefault. |
1440 | * |
1441 | * For example filesystem can call sb_start_intwrite() when starting a |
1442 | * transaction which somewhat eases handling of freezing for internal sources |
1443 | * of filesystem changes (internal fs threads, discarding preallocation on file |
1444 | * close, etc.). |
1445 | */ |
1446 | static inline void sb_start_intwrite(struct super_block *sb) |
1447 | { |
1448 | __sb_start_write(sb, SB_FREEZE_FS, true); |
1449 | } |
1450 | |
1451 | |
1452 | extern bool inode_owner_or_capable(const struct inode *inode); |
1453 | |
1454 | /* |
1455 | * VFS helper functions.. |
1456 | */ |
1457 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
1458 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1459 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
1460 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
1461 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
1462 | extern int vfs_rmdir(struct inode *, struct dentry *); |
1463 | extern int vfs_unlink(struct inode *, struct dentry *); |
1464 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
1465 | |
1466 | /* |
1467 | * VFS dentry helper functions. |
1468 | */ |
1469 | extern void dentry_unhash(struct dentry *dentry); |
1470 | |
1471 | /* |
1472 | * VFS file helper functions. |
1473 | */ |
1474 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
1475 | umode_t mode); |
1476 | /* |
1477 | * VFS FS_IOC_FIEMAP helper definitions. |
1478 | */ |
1479 | struct fiemap_extent_info { |
1480 | unsigned int fi_flags; /* Flags as passed from user */ |
1481 | unsigned int fi_extents_mapped; /* Number of mapped extents */ |
1482 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
1483 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1484 | fiemap_extent array */ |
1485 | }; |
1486 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
1487 | u64 phys, u64 len, u32 flags); |
1488 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
1489 | |
1490 | /* |
1491 | * File types |
1492 | * |
1493 | * NOTE! These match bits 12..15 of stat.st_mode |
1494 | * (ie "(i_mode >> 12) & 15"). |
1495 | */ |
1496 | #define DT_UNKNOWN 0 |
1497 | #define DT_FIFO 1 |
1498 | #define DT_CHR 2 |
1499 | #define DT_DIR 4 |
1500 | #define DT_BLK 6 |
1501 | #define DT_REG 8 |
1502 | #define DT_LNK 10 |
1503 | #define DT_SOCK 12 |
1504 | #define DT_WHT 14 |
1505 | |
1506 | /* |
1507 | * This is the "filldir" function type, used by readdir() to let |
1508 | * the kernel specify what kind of dirent layout it wants to have. |
1509 | * This allows the kernel to read directories into kernel space or |
1510 | * to have different dirent layouts depending on the binary type. |
1511 | */ |
1512 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
1513 | struct dir_context { |
1514 | const filldir_t actor; |
1515 | loff_t pos; |
1516 | }; |
1517 | |
1518 | struct block_device_operations; |
1519 | |
1520 | /* These macros are for out of kernel modules to test that |
1521 | * the kernel supports the unlocked_ioctl and compat_ioctl |
1522 | * fields in struct file_operations. */ |
1523 | #define HAVE_COMPAT_IOCTL 1 |
1524 | #define HAVE_UNLOCKED_IOCTL 1 |
1525 | |
1526 | struct file_operations { |
1527 | struct module *owner; |
1528 | loff_t (*llseek) (struct file *, loff_t, int); |
1529 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
1530 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
1531 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1532 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1533 | int (*iterate) (struct file *, struct dir_context *); |
1534 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
1535 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1536 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
1537 | int (*mmap) (struct file *, struct vm_area_struct *); |
1538 | int (*open) (struct inode *, struct file *); |
1539 | int (*flush) (struct file *, fl_owner_t id); |
1540 | int (*release) (struct inode *, struct file *); |
1541 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1542 | int (*aio_fsync) (struct kiocb *, int datasync); |
1543 | int (*fasync) (int, struct file *, int); |
1544 | int (*lock) (struct file *, int, struct file_lock *); |
1545 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1546 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
1547 | int (*check_flags)(int); |
1548 | int (*flock) (struct file *, int, struct file_lock *); |
1549 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1550 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
1551 | int (*setlease)(struct file *, long, struct file_lock **); |
1552 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1553 | loff_t len); |
1554 | int (*show_fdinfo)(struct seq_file *m, struct file *f); |
1555 | }; |
1556 | |
1557 | struct inode_operations { |
1558 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
1559 | void * (*follow_link) (struct dentry *, struct nameidata *); |
1560 | int (*permission) (struct inode *, int); |
1561 | struct posix_acl * (*get_acl)(struct inode *, int); |
1562 | |
1563 | int (*readlink) (struct dentry *, char __user *,int); |
1564 | void (*put_link) (struct dentry *, struct nameidata *, void *); |
1565 | |
1566 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1567 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1568 | int (*unlink) (struct inode *,struct dentry *); |
1569 | int (*symlink) (struct inode *,struct dentry *,const char *); |
1570 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1571 | int (*rmdir) (struct inode *,struct dentry *); |
1572 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1573 | int (*rename) (struct inode *, struct dentry *, |
1574 | struct inode *, struct dentry *); |
1575 | int (*setattr) (struct dentry *, struct iattr *); |
1576 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
1577 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
1578 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
1579 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
1580 | int (*removexattr) (struct dentry *, const char *); |
1581 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1582 | u64 len); |
1583 | int (*update_time)(struct inode *, struct timespec *, int); |
1584 | int (*atomic_open)(struct inode *, struct dentry *, |
1585 | struct file *, unsigned open_flag, |
1586 | umode_t create_mode, int *opened); |
1587 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
1588 | } ____cacheline_aligned; |
1589 | |
1590 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
1591 | unsigned long nr_segs, unsigned long fast_segs, |
1592 | struct iovec *fast_pointer, |
1593 | struct iovec **ret_pointer); |
1594 | |
1595 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1596 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
1597 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
1598 | unsigned long, loff_t *); |
1599 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
1600 | unsigned long, loff_t *); |
1601 | |
1602 | struct super_operations { |
1603 | struct inode *(*alloc_inode)(struct super_block *sb); |
1604 | void (*destroy_inode)(struct inode *); |
1605 | |
1606 | void (*dirty_inode) (struct inode *, int flags); |
1607 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
1608 | int (*drop_inode) (struct inode *); |
1609 | void (*evict_inode) (struct inode *); |
1610 | void (*put_super) (struct super_block *); |
1611 | int (*sync_fs)(struct super_block *sb, int wait); |
1612 | int (*freeze_fs) (struct super_block *); |
1613 | int (*unfreeze_fs) (struct super_block *); |
1614 | int (*statfs) (struct dentry *, struct kstatfs *); |
1615 | int (*remount_fs) (struct super_block *, int *, char *); |
1616 | void (*umount_begin) (struct super_block *); |
1617 | |
1618 | int (*show_options)(struct seq_file *, struct dentry *); |
1619 | int (*show_devname)(struct seq_file *, struct dentry *); |
1620 | int (*show_path)(struct seq_file *, struct dentry *); |
1621 | int (*show_stats)(struct seq_file *, struct dentry *); |
1622 | #ifdef CONFIG_QUOTA |
1623 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1624 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
1625 | #endif |
1626 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
1627 | long (*nr_cached_objects)(struct super_block *, int); |
1628 | long (*free_cached_objects)(struct super_block *, long, int); |
1629 | }; |
1630 | |
1631 | /* |
1632 | * Inode flags - they have no relation to superblock flags now |
1633 | */ |
1634 | #define S_SYNC 1 /* Writes are synced at once */ |
1635 | #define S_NOATIME 2 /* Do not update access times */ |
1636 | #define S_APPEND 4 /* Append-only file */ |
1637 | #define S_IMMUTABLE 8 /* Immutable file */ |
1638 | #define S_DEAD 16 /* removed, but still open directory */ |
1639 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
1640 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
1641 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
1642 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
1643 | #define S_PRIVATE 512 /* Inode is fs-internal */ |
1644 | #define S_IMA 1024 /* Inode has an associated IMA struct */ |
1645 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
1646 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
1647 | |
1648 | /* |
1649 | * Note that nosuid etc flags are inode-specific: setting some file-system |
1650 | * flags just means all the inodes inherit those flags by default. It might be |
1651 | * possible to override it selectively if you really wanted to with some |
1652 | * ioctl() that is not currently implemented. |
1653 | * |
1654 | * Exception: MS_RDONLY is always applied to the entire file system. |
1655 | * |
1656 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
1657 | * with files in use. This means that all of the inodes will not have their |
1658 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
1659 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
1660 | */ |
1661 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) |
1662 | |
1663 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
1664 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
1665 | ((inode)->i_flags & S_SYNC)) |
1666 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
1667 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
1668 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
1669 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
1670 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
1671 | |
1672 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
1673 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
1674 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
1675 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
1676 | |
1677 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
1678 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
1679 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
1680 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
1681 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
1682 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
1683 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
1684 | |
1685 | /* |
1686 | * Inode state bits. Protected by inode->i_lock |
1687 | * |
1688 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
1689 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
1690 | * |
1691 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
1692 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
1693 | * various stages of removing an inode. |
1694 | * |
1695 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1696 | * |
1697 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1698 | * fdatasync(). i_atime is the usual cause. |
1699 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1700 | * these changes separately from I_DIRTY_SYNC so that we |
1701 | * don't have to write inode on fdatasync() when only |
1702 | * mtime has changed in it. |
1703 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
1704 | * I_NEW Serves as both a mutex and completion notification. |
1705 | * New inodes set I_NEW. If two processes both create |
1706 | * the same inode, one of them will release its inode and |
1707 | * wait for I_NEW to be released before returning. |
1708 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
1709 | * also cause waiting on I_NEW, without I_NEW actually |
1710 | * being set. find_inode() uses this to prevent returning |
1711 | * nearly-dead inodes. |
1712 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1713 | * is zero. I_FREEING must be set when I_WILL_FREE is |
1714 | * cleared. |
1715 | * I_FREEING Set when inode is about to be freed but still has dirty |
1716 | * pages or buffers attached or the inode itself is still |
1717 | * dirty. |
1718 | * I_CLEAR Added by clear_inode(). In this state the inode is |
1719 | * clean and can be destroyed. Inode keeps I_FREEING. |
1720 | * |
1721 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
1722 | * prohibited for many purposes. iget() must wait for |
1723 | * the inode to be completely released, then create it |
1724 | * anew. Other functions will just ignore such inodes, |
1725 | * if appropriate. I_NEW is used for waiting. |
1726 | * |
1727 | * I_SYNC Writeback of inode is running. The bit is set during |
1728 | * data writeback, and cleared with a wakeup on the bit |
1729 | * address once it is done. The bit is also used to pin |
1730 | * the inode in memory for flusher thread. |
1731 | * |
1732 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1733 | * |
1734 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). |
1735 | * |
1736 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1737 | */ |
1738 | #define I_DIRTY_SYNC (1 << 0) |
1739 | #define I_DIRTY_DATASYNC (1 << 1) |
1740 | #define I_DIRTY_PAGES (1 << 2) |
1741 | #define __I_NEW 3 |
1742 | #define I_NEW (1 << __I_NEW) |
1743 | #define I_WILL_FREE (1 << 4) |
1744 | #define I_FREEING (1 << 5) |
1745 | #define I_CLEAR (1 << 6) |
1746 | #define __I_SYNC 7 |
1747 | #define I_SYNC (1 << __I_SYNC) |
1748 | #define I_REFERENCED (1 << 8) |
1749 | #define __I_DIO_WAKEUP 9 |
1750 | #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) |
1751 | #define I_LINKABLE (1 << 10) |
1752 | |
1753 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
1754 | |
1755 | extern void __mark_inode_dirty(struct inode *, int); |
1756 | static inline void mark_inode_dirty(struct inode *inode) |
1757 | { |
1758 | __mark_inode_dirty(inode, I_DIRTY); |
1759 | } |
1760 | |
1761 | static inline void mark_inode_dirty_sync(struct inode *inode) |
1762 | { |
1763 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
1764 | } |
1765 | |
1766 | extern void inc_nlink(struct inode *inode); |
1767 | extern void drop_nlink(struct inode *inode); |
1768 | extern void clear_nlink(struct inode *inode); |
1769 | extern void set_nlink(struct inode *inode, unsigned int nlink); |
1770 | |
1771 | static inline void inode_inc_link_count(struct inode *inode) |
1772 | { |
1773 | inc_nlink(inode); |
1774 | mark_inode_dirty(inode); |
1775 | } |
1776 | |
1777 | static inline void inode_dec_link_count(struct inode *inode) |
1778 | { |
1779 | drop_nlink(inode); |
1780 | mark_inode_dirty(inode); |
1781 | } |
1782 | |
1783 | /** |
1784 | * inode_inc_iversion - increments i_version |
1785 | * @inode: inode that need to be updated |
1786 | * |
1787 | * Every time the inode is modified, the i_version field will be incremented. |
1788 | * The filesystem has to be mounted with i_version flag |
1789 | */ |
1790 | |
1791 | static inline void inode_inc_iversion(struct inode *inode) |
1792 | { |
1793 | spin_lock(&inode->i_lock); |
1794 | inode->i_version++; |
1795 | spin_unlock(&inode->i_lock); |
1796 | } |
1797 | |
1798 | enum file_time_flags { |
1799 | S_ATIME = 1, |
1800 | S_MTIME = 2, |
1801 | S_CTIME = 4, |
1802 | S_VERSION = 8, |
1803 | }; |
1804 | |
1805 | extern void touch_atime(const struct path *); |
1806 | static inline void file_accessed(struct file *file) |
1807 | { |
1808 | if (!(file->f_flags & O_NOATIME)) |
1809 | touch_atime(&file->f_path); |
1810 | } |
1811 | |
1812 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
1813 | int sync_inode_metadata(struct inode *inode, int wait); |
1814 | |
1815 | struct file_system_type { |
1816 | const char *name; |
1817 | int fs_flags; |
1818 | #define FS_REQUIRES_DEV 1 |
1819 | #define FS_BINARY_MOUNTDATA 2 |
1820 | #define FS_HAS_SUBTYPE 4 |
1821 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
1822 | #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */ |
1823 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
1824 | struct dentry *(*mount) (struct file_system_type *, int, |
1825 | const char *, void *); |
1826 | void (*kill_sb) (struct super_block *); |
1827 | struct module *owner; |
1828 | struct file_system_type * next; |
1829 | struct hlist_head fs_supers; |
1830 | |
1831 | struct lock_class_key s_lock_key; |
1832 | struct lock_class_key s_umount_key; |
1833 | struct lock_class_key s_vfs_rename_key; |
1834 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
1835 | |
1836 | struct lock_class_key i_lock_key; |
1837 | struct lock_class_key i_mutex_key; |
1838 | struct lock_class_key i_mutex_dir_key; |
1839 | }; |
1840 | |
1841 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
1842 | |
1843 | extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
1844 | void *data, int (*fill_super)(struct super_block *, void *, int)); |
1845 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
1846 | int flags, const char *dev_name, void *data, |
1847 | int (*fill_super)(struct super_block *, void *, int)); |
1848 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
1849 | int flags, void *data, |
1850 | int (*fill_super)(struct super_block *, void *, int)); |
1851 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
1852 | int flags, void *data, |
1853 | int (*fill_super)(struct super_block *, void *, int)); |
1854 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1855 | void generic_shutdown_super(struct super_block *sb); |
1856 | void kill_block_super(struct super_block *sb); |
1857 | void kill_anon_super(struct super_block *sb); |
1858 | void kill_litter_super(struct super_block *sb); |
1859 | void deactivate_super(struct super_block *sb); |
1860 | void deactivate_locked_super(struct super_block *sb); |
1861 | int set_anon_super(struct super_block *s, void *data); |
1862 | int get_anon_bdev(dev_t *); |
1863 | void free_anon_bdev(dev_t); |
1864 | struct super_block *sget(struct file_system_type *type, |
1865 | int (*test)(struct super_block *,void *), |
1866 | int (*set)(struct super_block *,void *), |
1867 | int flags, void *data); |
1868 | extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
1869 | const struct super_operations *ops, |
1870 | const struct dentry_operations *dops, |
1871 | unsigned long); |
1872 | |
1873 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
1874 | #define fops_get(fops) \ |
1875 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
1876 | #define fops_put(fops) \ |
1877 | do { if (fops) module_put((fops)->owner); } while(0) |
1878 | |
1879 | extern int register_filesystem(struct file_system_type *); |
1880 | extern int unregister_filesystem(struct file_system_type *); |
1881 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
1882 | #define kern_mount(type) kern_mount_data(type, NULL) |
1883 | extern void kern_unmount(struct vfsmount *mnt); |
1884 | extern int may_umount_tree(struct vfsmount *); |
1885 | extern int may_umount(struct vfsmount *); |
1886 | extern long do_mount(const char *, const char *, const char *, unsigned long, void *); |
1887 | extern struct vfsmount *collect_mounts(struct path *); |
1888 | extern void drop_collected_mounts(struct vfsmount *); |
1889 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
1890 | struct vfsmount *); |
1891 | extern int vfs_statfs(struct path *, struct kstatfs *); |
1892 | extern int user_statfs(const char __user *, struct kstatfs *); |
1893 | extern int fd_statfs(int, struct kstatfs *); |
1894 | extern int vfs_ustat(dev_t, struct kstatfs *); |
1895 | extern int freeze_super(struct super_block *super); |
1896 | extern int thaw_super(struct super_block *super); |
1897 | extern bool our_mnt(struct vfsmount *mnt); |
1898 | extern bool fs_fully_visible(struct file_system_type *); |
1899 | |
1900 | extern int current_umask(void); |
1901 | |
1902 | /* /sys/fs */ |
1903 | extern struct kobject *fs_kobj; |
1904 | |
1905 | #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
1906 | |
1907 | #define FLOCK_VERIFY_READ 1 |
1908 | #define FLOCK_VERIFY_WRITE 2 |
1909 | |
1910 | #ifdef CONFIG_FILE_LOCKING |
1911 | extern int locks_mandatory_locked(struct inode *); |
1912 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
1913 | |
1914 | /* |
1915 | * Candidates for mandatory locking have the setgid bit set |
1916 | * but no group execute bit - an otherwise meaningless combination. |
1917 | */ |
1918 | |
1919 | static inline int __mandatory_lock(struct inode *ino) |
1920 | { |
1921 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
1922 | } |
1923 | |
1924 | /* |
1925 | * ... and these candidates should be on MS_MANDLOCK mounted fs, |
1926 | * otherwise these will be advisory locks |
1927 | */ |
1928 | |
1929 | static inline int mandatory_lock(struct inode *ino) |
1930 | { |
1931 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
1932 | } |
1933 | |
1934 | static inline int locks_verify_locked(struct inode *inode) |
1935 | { |
1936 | if (mandatory_lock(inode)) |
1937 | return locks_mandatory_locked(inode); |
1938 | return 0; |
1939 | } |
1940 | |
1941 | static inline int locks_verify_truncate(struct inode *inode, |
1942 | struct file *filp, |
1943 | loff_t size) |
1944 | { |
1945 | if (inode->i_flock && mandatory_lock(inode)) |
1946 | return locks_mandatory_area( |
1947 | FLOCK_VERIFY_WRITE, inode, filp, |
1948 | size < inode->i_size ? size : inode->i_size, |
1949 | (size < inode->i_size ? inode->i_size - size |
1950 | : size - inode->i_size) |
1951 | ); |
1952 | return 0; |
1953 | } |
1954 | |
1955 | static inline int break_lease(struct inode *inode, unsigned int mode) |
1956 | { |
1957 | if (inode->i_flock) |
1958 | return __break_lease(inode, mode); |
1959 | return 0; |
1960 | } |
1961 | #else /* !CONFIG_FILE_LOCKING */ |
1962 | static inline int locks_mandatory_locked(struct inode *inode) |
1963 | { |
1964 | return 0; |
1965 | } |
1966 | |
1967 | static inline int locks_mandatory_area(int rw, struct inode *inode, |
1968 | struct file *filp, loff_t offset, |
1969 | size_t count) |
1970 | { |
1971 | return 0; |
1972 | } |
1973 | |
1974 | static inline int __mandatory_lock(struct inode *inode) |
1975 | { |
1976 | return 0; |
1977 | } |
1978 | |
1979 | static inline int mandatory_lock(struct inode *inode) |
1980 | { |
1981 | return 0; |
1982 | } |
1983 | |
1984 | static inline int locks_verify_locked(struct inode *inode) |
1985 | { |
1986 | return 0; |
1987 | } |
1988 | |
1989 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
1990 | size_t size) |
1991 | { |
1992 | return 0; |
1993 | } |
1994 | |
1995 | static inline int break_lease(struct inode *inode, unsigned int mode) |
1996 | { |
1997 | return 0; |
1998 | } |
1999 | |
2000 | #endif /* CONFIG_FILE_LOCKING */ |
2001 | |
2002 | /* fs/open.c */ |
2003 | struct audit_names; |
2004 | struct filename { |
2005 | const char *name; /* pointer to actual string */ |
2006 | const __user char *uptr; /* original userland pointer */ |
2007 | struct audit_names *aname; |
2008 | bool separate; /* should "name" be freed? */ |
2009 | }; |
2010 | |
2011 | extern long vfs_truncate(struct path *, loff_t); |
2012 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2013 | struct file *filp); |
2014 | extern int do_fallocate(struct file *file, int mode, loff_t offset, |
2015 | loff_t len); |
2016 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
2017 | umode_t mode); |
2018 | extern struct file *file_open_name(struct filename *, int, umode_t); |
2019 | extern struct file *filp_open(const char *, int, umode_t); |
2020 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
2021 | const char *, int); |
2022 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
2023 | extern int filp_close(struct file *, fl_owner_t id); |
2024 | |
2025 | extern struct filename *getname(const char __user *); |
2026 | |
2027 | enum { |
2028 | FILE_CREATED = 1, |
2029 | FILE_OPENED = 2 |
2030 | }; |
2031 | extern int finish_open(struct file *file, struct dentry *dentry, |
2032 | int (*open)(struct inode *, struct file *), |
2033 | int *opened); |
2034 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
2035 | |
2036 | /* fs/ioctl.c */ |
2037 | |
2038 | extern int ioctl_preallocate(struct file *filp, void __user *argp); |
2039 | |
2040 | /* fs/dcache.c */ |
2041 | extern void __init vfs_caches_init_early(void); |
2042 | extern void __init vfs_caches_init(unsigned long); |
2043 | |
2044 | extern struct kmem_cache *names_cachep; |
2045 | |
2046 | extern void final_putname(struct filename *name); |
2047 | |
2048 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
2049 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
2050 | #ifndef CONFIG_AUDITSYSCALL |
2051 | #define putname(name) final_putname(name) |
2052 | #else |
2053 | extern void putname(struct filename *name); |
2054 | #endif |
2055 | |
2056 | #ifdef CONFIG_BLOCK |
2057 | extern int register_blkdev(unsigned int, const char *); |
2058 | extern void unregister_blkdev(unsigned int, const char *); |
2059 | extern struct block_device *bdget(dev_t); |
2060 | extern struct block_device *bdgrab(struct block_device *bdev); |
2061 | extern void bd_set_size(struct block_device *, loff_t size); |
2062 | extern void bd_forget(struct inode *inode); |
2063 | extern void bdput(struct block_device *); |
2064 | extern void invalidate_bdev(struct block_device *); |
2065 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
2066 | extern int sync_blockdev(struct block_device *bdev); |
2067 | extern void kill_bdev(struct block_device *); |
2068 | extern struct super_block *freeze_bdev(struct block_device *); |
2069 | extern void emergency_thaw_all(void); |
2070 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2071 | extern int fsync_bdev(struct block_device *); |
2072 | extern int sb_is_blkdev_sb(struct super_block *sb); |
2073 | #else |
2074 | static inline void bd_forget(struct inode *inode) {} |
2075 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
2076 | static inline void kill_bdev(struct block_device *bdev) {} |
2077 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2078 | |
2079 | static inline struct super_block *freeze_bdev(struct block_device *sb) |
2080 | { |
2081 | return NULL; |
2082 | } |
2083 | |
2084 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
2085 | { |
2086 | return 0; |
2087 | } |
2088 | |
2089 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) |
2090 | { |
2091 | } |
2092 | |
2093 | static inline int sb_is_blkdev_sb(struct super_block *sb) |
2094 | { |
2095 | return 0; |
2096 | } |
2097 | #endif |
2098 | extern int sync_filesystem(struct super_block *); |
2099 | extern const struct file_operations def_blk_fops; |
2100 | extern const struct file_operations def_chr_fops; |
2101 | extern const struct file_operations bad_sock_fops; |
2102 | #ifdef CONFIG_BLOCK |
2103 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
2104 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
2105 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
2106 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
2107 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2108 | void *holder); |
2109 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, |
2110 | void *holder); |
2111 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
2112 | #ifdef CONFIG_SYSFS |
2113 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
2114 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2115 | struct gendisk *disk); |
2116 | #else |
2117 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2118 | struct gendisk *disk) |
2119 | { |
2120 | return 0; |
2121 | } |
2122 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2123 | struct gendisk *disk) |
2124 | { |
2125 | } |
2126 | #endif |
2127 | #endif |
2128 | |
2129 | /* fs/char_dev.c */ |
2130 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
2131 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2132 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
2133 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2134 | unsigned int count, const char *name, |
2135 | const struct file_operations *fops); |
2136 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
2137 | unsigned int count, const char *name); |
2138 | extern void unregister_chrdev_region(dev_t, unsigned); |
2139 | extern void chrdev_show(struct seq_file *,off_t); |
2140 | |
2141 | static inline int register_chrdev(unsigned int major, const char *name, |
2142 | const struct file_operations *fops) |
2143 | { |
2144 | return __register_chrdev(major, 0, 256, name, fops); |
2145 | } |
2146 | |
2147 | static inline void unregister_chrdev(unsigned int major, const char *name) |
2148 | { |
2149 | __unregister_chrdev(major, 0, 256, name); |
2150 | } |
2151 | |
2152 | /* fs/block_dev.c */ |
2153 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
2154 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
2155 | |
2156 | #ifdef CONFIG_BLOCK |
2157 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
2158 | extern const char *__bdevname(dev_t, char *buffer); |
2159 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
2160 | extern struct block_device *lookup_bdev(const char *); |
2161 | extern void blkdev_show(struct seq_file *,off_t); |
2162 | |
2163 | #else |
2164 | #define BLKDEV_MAJOR_HASH_SIZE 0 |
2165 | #endif |
2166 | |
2167 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
2168 | |
2169 | /* Invalid inode operations -- fs/bad_inode.c */ |
2170 | extern void make_bad_inode(struct inode *); |
2171 | extern int is_bad_inode(struct inode *); |
2172 | |
2173 | #ifdef CONFIG_BLOCK |
2174 | /* |
2175 | * return READ, READA, or WRITE |
2176 | */ |
2177 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
2178 | |
2179 | /* |
2180 | * return data direction, READ or WRITE |
2181 | */ |
2182 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
2183 | |
2184 | extern void check_disk_size_change(struct gendisk *disk, |
2185 | struct block_device *bdev); |
2186 | extern int revalidate_disk(struct gendisk *); |
2187 | extern int check_disk_change(struct block_device *); |
2188 | extern int __invalidate_device(struct block_device *, bool); |
2189 | extern int invalidate_partition(struct gendisk *, int); |
2190 | #endif |
2191 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2192 | pgoff_t start, pgoff_t end); |
2193 | |
2194 | static inline void invalidate_remote_inode(struct inode *inode) |
2195 | { |
2196 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
2197 | S_ISLNK(inode->i_mode)) |
2198 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
2199 | } |
2200 | extern int invalidate_inode_pages2(struct address_space *mapping); |
2201 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
2202 | pgoff_t start, pgoff_t end); |
2203 | extern int write_inode_now(struct inode *, int); |
2204 | extern int filemap_fdatawrite(struct address_space *); |
2205 | extern int filemap_flush(struct address_space *); |
2206 | extern int filemap_fdatawait(struct address_space *); |
2207 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2208 | loff_t lend); |
2209 | extern int filemap_write_and_wait(struct address_space *mapping); |
2210 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
2211 | loff_t lstart, loff_t lend); |
2212 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2213 | loff_t start, loff_t end, int sync_mode); |
2214 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2215 | loff_t start, loff_t end); |
2216 | |
2217 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2218 | int datasync); |
2219 | extern int vfs_fsync(struct file *file, int datasync); |
2220 | extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); |
2221 | extern void emergency_sync(void); |
2222 | extern void emergency_remount(void); |
2223 | #ifdef CONFIG_BLOCK |
2224 | extern sector_t bmap(struct inode *, sector_t); |
2225 | #endif |
2226 | extern int notify_change(struct dentry *, struct iattr *); |
2227 | extern int inode_permission(struct inode *, int); |
2228 | extern int generic_permission(struct inode *, int); |
2229 | |
2230 | static inline bool execute_ok(struct inode *inode) |
2231 | { |
2232 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
2233 | } |
2234 | |
2235 | static inline struct inode *file_inode(struct file *f) |
2236 | { |
2237 | return f->f_inode; |
2238 | } |
2239 | |
2240 | static inline void file_start_write(struct file *file) |
2241 | { |
2242 | if (!S_ISREG(file_inode(file)->i_mode)) |
2243 | return; |
2244 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); |
2245 | } |
2246 | |
2247 | static inline bool file_start_write_trylock(struct file *file) |
2248 | { |
2249 | if (!S_ISREG(file_inode(file)->i_mode)) |
2250 | return true; |
2251 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); |
2252 | } |
2253 | |
2254 | static inline void file_end_write(struct file *file) |
2255 | { |
2256 | if (!S_ISREG(file_inode(file)->i_mode)) |
2257 | return; |
2258 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); |
2259 | } |
2260 | |
2261 | /* |
2262 | * get_write_access() gets write permission for a file. |
2263 | * put_write_access() releases this write permission. |
2264 | * This is used for regular files. |
2265 | * We cannot support write (and maybe mmap read-write shared) accesses and |
2266 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode |
2267 | * can have the following values: |
2268 | * 0: no writers, no VM_DENYWRITE mappings |
2269 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist |
2270 | * > 0: (i_writecount) users are writing to the file. |
2271 | * |
2272 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe |
2273 | * except for the cases where we don't hold i_writecount yet. Then we need to |
2274 | * use {get,deny}_write_access() - these functions check the sign and refuse |
2275 | * to do the change if sign is wrong. |
2276 | */ |
2277 | static inline int get_write_access(struct inode *inode) |
2278 | { |
2279 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; |
2280 | } |
2281 | static inline int deny_write_access(struct file *file) |
2282 | { |
2283 | struct inode *inode = file_inode(file); |
2284 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2285 | } |
2286 | static inline void put_write_access(struct inode * inode) |
2287 | { |
2288 | atomic_dec(&inode->i_writecount); |
2289 | } |
2290 | static inline void allow_write_access(struct file *file) |
2291 | { |
2292 | if (file) |
2293 | atomic_inc(&file_inode(file)->i_writecount); |
2294 | } |
2295 | #ifdef CONFIG_IMA |
2296 | static inline void i_readcount_dec(struct inode *inode) |
2297 | { |
2298 | BUG_ON(!atomic_read(&inode->i_readcount)); |
2299 | atomic_dec(&inode->i_readcount); |
2300 | } |
2301 | static inline void i_readcount_inc(struct inode *inode) |
2302 | { |
2303 | atomic_inc(&inode->i_readcount); |
2304 | } |
2305 | #else |
2306 | static inline void i_readcount_dec(struct inode *inode) |
2307 | { |
2308 | return; |
2309 | } |
2310 | static inline void i_readcount_inc(struct inode *inode) |
2311 | { |
2312 | return; |
2313 | } |
2314 | #endif |
2315 | extern int do_pipe_flags(int *, int); |
2316 | |
2317 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
2318 | extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); |
2319 | extern struct file * open_exec(const char *); |
2320 | |
2321 | /* fs/dcache.c -- generic fs support functions */ |
2322 | extern int is_subdir(struct dentry *, struct dentry *); |
2323 | extern int path_is_under(struct path *, struct path *); |
2324 | |
2325 | #include <linux/err.h> |
2326 | |
2327 | /* needed for stackable file system support */ |
2328 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
2329 | |
2330 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
2331 | |
2332 | extern int inode_init_always(struct super_block *, struct inode *); |
2333 | extern void inode_init_once(struct inode *); |
2334 | extern void address_space_init_once(struct address_space *mapping); |
2335 | extern void ihold(struct inode * inode); |
2336 | extern void iput(struct inode *); |
2337 | extern struct inode * igrab(struct inode *); |
2338 | extern ino_t iunique(struct super_block *, ino_t); |
2339 | extern int inode_needs_sync(struct inode *inode); |
2340 | extern int generic_delete_inode(struct inode *inode); |
2341 | static inline int generic_drop_inode(struct inode *inode) |
2342 | { |
2343 | return !inode->i_nlink || inode_unhashed(inode); |
2344 | } |
2345 | |
2346 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2347 | unsigned long hashval, int (*test)(struct inode *, void *), |
2348 | void *data); |
2349 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2350 | int (*test)(struct inode *, void *), void *data); |
2351 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
2352 | |
2353 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
2354 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
2355 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2356 | extern int insert_inode_locked(struct inode *); |
2357 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2358 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); |
2359 | #else |
2360 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; |
2361 | #endif |
2362 | extern void unlock_new_inode(struct inode *); |
2363 | extern unsigned int get_next_ino(void); |
2364 | |
2365 | extern void __iget(struct inode * inode); |
2366 | extern void iget_failed(struct inode *); |
2367 | extern void clear_inode(struct inode *); |
2368 | extern void __destroy_inode(struct inode *); |
2369 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2370 | extern struct inode *new_inode(struct super_block *sb); |
2371 | extern void free_inode_nonrcu(struct inode *inode); |
2372 | extern int should_remove_suid(struct dentry *); |
2373 | extern int file_remove_suid(struct file *); |
2374 | |
2375 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
2376 | static inline void insert_inode_hash(struct inode *inode) |
2377 | { |
2378 | __insert_inode_hash(inode, inode->i_ino); |
2379 | } |
2380 | |
2381 | extern void __remove_inode_hash(struct inode *); |
2382 | static inline void remove_inode_hash(struct inode *inode) |
2383 | { |
2384 | if (!inode_unhashed(inode)) |
2385 | __remove_inode_hash(inode); |
2386 | } |
2387 | |
2388 | extern void inode_sb_list_add(struct inode *inode); |
2389 | |
2390 | #ifdef CONFIG_BLOCK |
2391 | extern void submit_bio(int, struct bio *); |
2392 | extern int bdev_read_only(struct block_device *); |
2393 | #endif |
2394 | extern int set_blocksize(struct block_device *, int); |
2395 | extern int sb_set_blocksize(struct super_block *, int); |
2396 | extern int sb_min_blocksize(struct super_block *, int); |
2397 | |
2398 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
2399 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
2400 | extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr, |
2401 | unsigned long size, pgoff_t pgoff); |
2402 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); |
2403 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
2404 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
2405 | extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, |
2406 | loff_t *); |
2407 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
2408 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
2409 | unsigned long *, loff_t, loff_t *, size_t, size_t); |
2410 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, |
2411 | unsigned long, loff_t, loff_t *, size_t, ssize_t); |
2412 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
2413 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); |
2414 | extern int generic_segment_checks(const struct iovec *iov, |
2415 | unsigned long *nr_segs, size_t *count, int access_flags); |
2416 | |
2417 | /* fs/block_dev.c */ |
2418 | extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, |
2419 | unsigned long nr_segs, loff_t pos); |
2420 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2421 | int datasync); |
2422 | extern void block_sync_page(struct page *page); |
2423 | |
2424 | /* fs/splice.c */ |
2425 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
2426 | struct pipe_inode_info *, size_t, unsigned int); |
2427 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
2428 | struct pipe_inode_info *, size_t, unsigned int); |
2429 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
2430 | struct file *, loff_t *, size_t, unsigned int); |
2431 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
2432 | struct file *out, loff_t *, size_t len, unsigned int flags); |
2433 | |
2434 | extern void |
2435 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
2436 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
2437 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); |
2438 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
2439 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
2440 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
2441 | int whence, loff_t maxsize, loff_t eof); |
2442 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
2443 | int whence, loff_t size); |
2444 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2445 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
2446 | |
2447 | #ifdef CONFIG_FS_XIP |
2448 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
2449 | loff_t *ppos); |
2450 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
2451 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
2452 | size_t len, loff_t *ppos); |
2453 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
2454 | #else |
2455 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
2456 | { |
2457 | return 0; |
2458 | } |
2459 | #endif |
2460 | |
2461 | #ifdef CONFIG_BLOCK |
2462 | typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
2463 | loff_t file_offset); |
2464 | |
2465 | enum { |
2466 | /* need locking between buffered and direct access */ |
2467 | DIO_LOCKING = 0x01, |
2468 | |
2469 | /* filesystem does not support filling holes */ |
2470 | DIO_SKIP_HOLES = 0x02, |
2471 | }; |
2472 | |
2473 | void dio_end_io(struct bio *bio, int error); |
2474 | |
2475 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
2476 | struct block_device *bdev, const struct iovec *iov, loff_t offset, |
2477 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
2478 | dio_submit_t submit_io, int flags); |
2479 | |
2480 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
2481 | struct inode *inode, const struct iovec *iov, loff_t offset, |
2482 | unsigned long nr_segs, get_block_t get_block) |
2483 | { |
2484 | return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
2485 | offset, nr_segs, get_block, NULL, NULL, |
2486 | DIO_LOCKING | DIO_SKIP_HOLES); |
2487 | } |
2488 | #endif |
2489 | |
2490 | void inode_dio_wait(struct inode *inode); |
2491 | void inode_dio_done(struct inode *inode); |
2492 | |
2493 | extern const struct file_operations generic_ro_fops; |
2494 | |
2495 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
2496 | |
2497 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); |
2498 | extern int page_readlink(struct dentry *, char __user *, int); |
2499 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
2500 | extern void page_put_link(struct dentry *, struct nameidata *, void *); |
2501 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
2502 | int nofs); |
2503 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
2504 | extern const struct inode_operations page_symlink_inode_operations; |
2505 | extern int generic_readlink(struct dentry *, char __user *, int); |
2506 | extern void generic_fillattr(struct inode *, struct kstat *); |
2507 | extern int vfs_getattr(struct path *, struct kstat *); |
2508 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
2509 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
2510 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
2511 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
2512 | loff_t inode_get_bytes(struct inode *inode); |
2513 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
2514 | |
2515 | extern int vfs_readdir(struct file *, filldir_t, void *); |
2516 | extern int iterate_dir(struct file *, struct dir_context *); |
2517 | |
2518 | extern int vfs_stat(const char __user *, struct kstat *); |
2519 | extern int vfs_lstat(const char __user *, struct kstat *); |
2520 | extern int vfs_fstat(unsigned int, struct kstat *); |
2521 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
2522 | |
2523 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
2524 | unsigned long arg); |
2525 | extern int __generic_block_fiemap(struct inode *inode, |
2526 | struct fiemap_extent_info *fieinfo, |
2527 | loff_t start, loff_t len, |
2528 | get_block_t *get_block); |
2529 | extern int generic_block_fiemap(struct inode *inode, |
2530 | struct fiemap_extent_info *fieinfo, u64 start, |
2531 | u64 len, get_block_t *get_block); |
2532 | |
2533 | extern void get_filesystem(struct file_system_type *fs); |
2534 | extern void put_filesystem(struct file_system_type *fs); |
2535 | extern struct file_system_type *get_fs_type(const char *name); |
2536 | extern struct super_block *get_super(struct block_device *); |
2537 | extern struct super_block *get_super_thawed(struct block_device *); |
2538 | extern struct super_block *get_active_super(struct block_device *bdev); |
2539 | extern void drop_super(struct super_block *sb); |
2540 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
2541 | extern void iterate_supers_type(struct file_system_type *, |
2542 | void (*)(struct super_block *, void *), void *); |
2543 | |
2544 | extern int dcache_dir_open(struct inode *, struct file *); |
2545 | extern int dcache_dir_close(struct inode *, struct file *); |
2546 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
2547 | extern int dcache_readdir(struct file *, struct dir_context *); |
2548 | extern int simple_setattr(struct dentry *, struct iattr *); |
2549 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
2550 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
2551 | extern int simple_open(struct inode *inode, struct file *file); |
2552 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
2553 | extern int simple_unlink(struct inode *, struct dentry *); |
2554 | extern int simple_rmdir(struct inode *, struct dentry *); |
2555 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
2556 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
2557 | extern int simple_empty(struct dentry *); |
2558 | extern int simple_readpage(struct file *file, struct page *page); |
2559 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
2560 | loff_t pos, unsigned len, unsigned flags, |
2561 | struct page **pagep, void **fsdata); |
2562 | extern int simple_write_end(struct file *file, struct address_space *mapping, |
2563 | loff_t pos, unsigned len, unsigned copied, |
2564 | struct page *page, void *fsdata); |
2565 | |
2566 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
2567 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
2568 | extern const struct file_operations simple_dir_operations; |
2569 | extern const struct inode_operations simple_dir_inode_operations; |
2570 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
2571 | struct dentry *d_alloc_name(struct dentry *, const char *); |
2572 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
2573 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
2574 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
2575 | |
2576 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
2577 | loff_t *ppos, const void *from, size_t available); |
2578 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
2579 | const void __user *from, size_t count); |
2580 | |
2581 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
2582 | |
2583 | extern int generic_check_addressable(unsigned, u64); |
2584 | |
2585 | #ifdef CONFIG_MIGRATION |
2586 | extern int buffer_migrate_page(struct address_space *, |
2587 | struct page *, struct page *, |
2588 | enum migrate_mode); |
2589 | #else |
2590 | #define buffer_migrate_page NULL |
2591 | #endif |
2592 | |
2593 | extern int inode_change_ok(const struct inode *, struct iattr *); |
2594 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
2595 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
2596 | |
2597 | extern int file_update_time(struct file *file); |
2598 | |
2599 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
2600 | extern void save_mount_options(struct super_block *sb, char *options); |
2601 | extern void replace_mount_options(struct super_block *sb, char *options); |
2602 | |
2603 | static inline ino_t parent_ino(struct dentry *dentry) |
2604 | { |
2605 | ino_t res; |
2606 | |
2607 | /* |
2608 | * Don't strictly need d_lock here? If the parent ino could change |
2609 | * then surely we'd have a deeper race in the caller? |
2610 | */ |
2611 | spin_lock(&dentry->d_lock); |
2612 | res = dentry->d_parent->d_inode->i_ino; |
2613 | spin_unlock(&dentry->d_lock); |
2614 | return res; |
2615 | } |
2616 | |
2617 | /* Transaction based IO helpers */ |
2618 | |
2619 | /* |
2620 | * An argresp is stored in an allocated page and holds the |
2621 | * size of the argument or response, along with its content |
2622 | */ |
2623 | struct simple_transaction_argresp { |
2624 | ssize_t size; |
2625 | char data[0]; |
2626 | }; |
2627 | |
2628 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
2629 | |
2630 | char *simple_transaction_get(struct file *file, const char __user *buf, |
2631 | size_t size); |
2632 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
2633 | size_t size, loff_t *pos); |
2634 | int simple_transaction_release(struct inode *inode, struct file *file); |
2635 | |
2636 | void simple_transaction_set(struct file *file, size_t n); |
2637 | |
2638 | /* |
2639 | * simple attribute files |
2640 | * |
2641 | * These attributes behave similar to those in sysfs: |
2642 | * |
2643 | * Writing to an attribute immediately sets a value, an open file can be |
2644 | * written to multiple times. |
2645 | * |
2646 | * Reading from an attribute creates a buffer from the value that might get |
2647 | * read with multiple read calls. When the attribute has been read |
2648 | * completely, no further read calls are possible until the file is opened |
2649 | * again. |
2650 | * |
2651 | * All attributes contain a text representation of a numeric value |
2652 | * that are accessed with the get() and set() functions. |
2653 | */ |
2654 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
2655 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
2656 | { \ |
2657 | __simple_attr_check_format(__fmt, 0ull); \ |
2658 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
2659 | } \ |
2660 | static const struct file_operations __fops = { \ |
2661 | .owner = THIS_MODULE, \ |
2662 | .open = __fops ## _open, \ |
2663 | .release = simple_attr_release, \ |
2664 | .read = simple_attr_read, \ |
2665 | .write = simple_attr_write, \ |
2666 | .llseek = generic_file_llseek, \ |
2667 | }; |
2668 | |
2669 | static inline __printf(1, 2) |
2670 | void __simple_attr_check_format(const char *fmt, ...) |
2671 | { |
2672 | /* don't do anything, just let the compiler check the arguments; */ |
2673 | } |
2674 | |
2675 | int simple_attr_open(struct inode *inode, struct file *file, |
2676 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
2677 | const char *fmt); |
2678 | int simple_attr_release(struct inode *inode, struct file *file); |
2679 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
2680 | size_t len, loff_t *ppos); |
2681 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
2682 | size_t len, loff_t *ppos); |
2683 | |
2684 | struct ctl_table; |
2685 | int proc_nr_files(struct ctl_table *table, int write, |
2686 | void __user *buffer, size_t *lenp, loff_t *ppos); |
2687 | int proc_nr_dentry(struct ctl_table *table, int write, |
2688 | void __user *buffer, size_t *lenp, loff_t *ppos); |
2689 | int proc_nr_inodes(struct ctl_table *table, int write, |
2690 | void __user *buffer, size_t *lenp, loff_t *ppos); |
2691 | int __init get_filesystem_list(char *buf); |
2692 | |
2693 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
2694 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
2695 | |
2696 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
2697 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
2698 | (flag & __FMODE_NONOTIFY))) |
2699 | |
2700 | static inline int is_sxid(umode_t mode) |
2701 | { |
2702 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); |
2703 | } |
2704 | |
2705 | static inline void inode_has_no_xattr(struct inode *inode) |
2706 | { |
2707 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
2708 | inode->i_flags |= S_NOSEC; |
2709 | } |
2710 | |
2711 | static inline bool dir_emit(struct dir_context *ctx, |
2712 | const char *name, int namelen, |
2713 | u64 ino, unsigned type) |
2714 | { |
2715 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; |
2716 | } |
2717 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) |
2718 | { |
2719 | return ctx->actor(ctx, ".", 1, ctx->pos, |
2720 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; |
2721 | } |
2722 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) |
2723 | { |
2724 | return ctx->actor(ctx, "..", 2, ctx->pos, |
2725 | parent_ino(file->f_path.dentry), DT_DIR) == 0; |
2726 | } |
2727 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) |
2728 | { |
2729 | if (ctx->pos == 0) { |
2730 | if (!dir_emit_dot(file, ctx)) |
2731 | return false; |
2732 | ctx->pos = 1; |
2733 | } |
2734 | if (ctx->pos == 1) { |
2735 | if (!dir_emit_dotdot(file, ctx)) |
2736 | return false; |
2737 | ctx->pos = 2; |
2738 | } |
2739 | return true; |
2740 | } |
2741 | static inline bool dir_relax(struct inode *inode) |
2742 | { |
2743 | mutex_unlock(&inode->i_mutex); |
2744 | mutex_lock(&inode->i_mutex); |
2745 | return !IS_DEADDIR(inode); |
2746 | } |
2747 | |
2748 | #endif /* _LINUX_FS_H */ |
2749 |
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v2.6.34-rc5
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