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1da177e4 LT |
1 | #ifndef _LINUX_FS_H |
2 | #define _LINUX_FS_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/linkage.h> |
5 | #include <linux/wait.h> | |
1da177e4 LT |
6 | #include <linux/kdev_t.h> |
7 | #include <linux/dcache.h> | |
3f8206d4 | 8 | #include <linux/path.h> |
1da177e4 LT |
9 | #include <linux/stat.h> |
10 | #include <linux/cache.h> | |
1da177e4 | 11 | #include <linux/list.h> |
bc3b14cb | 12 | #include <linux/list_lru.h> |
4f5e65a1 | 13 | #include <linux/llist.h> |
1da177e4 | 14 | #include <linux/radix-tree.h> |
6b2dbba8 | 15 | #include <linux/rbtree.h> |
1da177e4 | 16 | #include <linux/init.h> |
914e2637 | 17 | #include <linux/pid.h> |
187f1882 | 18 | #include <linux/bug.h> |
1b1dcc1b | 19 | #include <linux/mutex.h> |
c8c06efa | 20 | #include <linux/rwsem.h> |
3bd858ab | 21 | #include <linux/capability.h> |
6188e10d | 22 | #include <linux/semaphore.h> |
c4b929b8 | 23 | #include <linux/fiemap.h> |
ceb5bdc2 | 24 | #include <linux/rculist_bl.h> |
07b8ce1e | 25 | #include <linux/atomic.h> |
83aeeada | 26 | #include <linux/shrinker.h> |
c1aab02d | 27 | #include <linux/migrate_mode.h> |
92361636 | 28 | #include <linux/uidgid.h> |
5accdf82 | 29 | #include <linux/lockdep.h> |
c2b1ad80 | 30 | #include <linux/percpu-rwsem.h> |
853b39a7 | 31 | #include <linux/workqueue.h> |
8129ed29 | 32 | #include <linux/percpu-rwsem.h> |
fceef393 | 33 | #include <linux/delayed_call.h> |
1da177e4 | 34 | |
1da177e4 | 35 | #include <asm/byteorder.h> |
607ca46e | 36 | #include <uapi/linux/fs.h> |
1da177e4 | 37 | |
b83ae6d4 | 38 | struct backing_dev_info; |
52ebea74 | 39 | struct bdi_writeback; |
2f8b5444 | 40 | struct bio; |
a5694255 | 41 | struct export_operations; |
a885c8c4 | 42 | struct hd_geometry; |
1da177e4 | 43 | struct iovec; |
92198f7e | 44 | struct kiocb; |
57cc7215 | 45 | struct kobject; |
1da177e4 LT |
46 | struct pipe_inode_info; |
47 | struct poll_table_struct; | |
48 | struct kstatfs; | |
49 | struct vm_area_struct; | |
50 | struct vfsmount; | |
745ca247 | 51 | struct cred; |
a509bc1a | 52 | struct swap_info_struct; |
55985dd7 | 53 | struct seq_file; |
7b7a8665 | 54 | struct workqueue_struct; |
3b93f911 | 55 | struct iov_iter; |
0b81d077 JK |
56 | struct fscrypt_info; |
57 | struct fscrypt_operations; | |
1da177e4 | 58 | |
74bf17cf | 59 | extern void __init inode_init(void); |
1da177e4 | 60 | extern void __init inode_init_early(void); |
4248b0da MG |
61 | extern void __init files_init(void); |
62 | extern void __init files_maxfiles_init(void); | |
1da177e4 | 63 | |
dded4f4d | 64 | extern struct files_stat_struct files_stat; |
518de9b3 | 65 | extern unsigned long get_max_files(void); |
9b80a184 | 66 | extern unsigned int sysctl_nr_open; |
dded4f4d JE |
67 | extern struct inodes_stat_t inodes_stat; |
68 | extern int leases_enable, lease_break_time; | |
800179c9 KC |
69 | extern int sysctl_protected_symlinks; |
70 | extern int sysctl_protected_hardlinks; | |
dded4f4d | 71 | |
1da177e4 LT |
72 | struct buffer_head; |
73 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
74 | struct buffer_head *bh_result, int create); | |
187372a3 | 75 | typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
7b7a8665 | 76 | ssize_t bytes, void *private); |
1da177e4 | 77 | |
bbc1096a DH |
78 | #define MAY_EXEC 0x00000001 |
79 | #define MAY_WRITE 0x00000002 | |
80 | #define MAY_READ 0x00000004 | |
81 | #define MAY_APPEND 0x00000008 | |
82 | #define MAY_ACCESS 0x00000010 | |
83 | #define MAY_OPEN 0x00000020 | |
84 | #define MAY_CHDIR 0x00000040 | |
85 | /* called from RCU mode, don't block */ | |
86 | #define MAY_NOT_BLOCK 0x00000080 | |
87 | ||
88 | /* | |
89 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond | |
90 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() | |
91 | */ | |
92 | ||
93 | /* file is open for reading */ | |
94 | #define FMODE_READ ((__force fmode_t)0x1) | |
95 | /* file is open for writing */ | |
96 | #define FMODE_WRITE ((__force fmode_t)0x2) | |
97 | /* file is seekable */ | |
98 | #define FMODE_LSEEK ((__force fmode_t)0x4) | |
99 | /* file can be accessed using pread */ | |
100 | #define FMODE_PREAD ((__force fmode_t)0x8) | |
101 | /* file can be accessed using pwrite */ | |
102 | #define FMODE_PWRITE ((__force fmode_t)0x10) | |
103 | /* File is opened for execution with sys_execve / sys_uselib */ | |
104 | #define FMODE_EXEC ((__force fmode_t)0x20) | |
105 | /* File is opened with O_NDELAY (only set for block devices) */ | |
106 | #define FMODE_NDELAY ((__force fmode_t)0x40) | |
107 | /* File is opened with O_EXCL (only set for block devices) */ | |
108 | #define FMODE_EXCL ((__force fmode_t)0x80) | |
109 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls | |
110 | (specialy hack for floppy.c) */ | |
111 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) | |
112 | /* 32bit hashes as llseek() offset (for directories) */ | |
113 | #define FMODE_32BITHASH ((__force fmode_t)0x200) | |
114 | /* 64bit hashes as llseek() offset (for directories) */ | |
115 | #define FMODE_64BITHASH ((__force fmode_t)0x400) | |
116 | ||
117 | /* | |
118 | * Don't update ctime and mtime. | |
119 | * | |
120 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll | |
121 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. | |
122 | */ | |
123 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) | |
124 | ||
125 | /* Expect random access pattern */ | |
126 | #define FMODE_RANDOM ((__force fmode_t)0x1000) | |
127 | ||
128 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ | |
129 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) | |
130 | ||
131 | /* File is opened with O_PATH; almost nothing can be done with it */ | |
132 | #define FMODE_PATH ((__force fmode_t)0x4000) | |
133 | ||
9c225f26 LT |
134 | /* File needs atomic accesses to f_pos */ |
135 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) | |
83f936c7 AV |
136 | /* Write access to underlying fs */ |
137 | #define FMODE_WRITER ((__force fmode_t)0x10000) | |
7f7f25e8 AV |
138 | /* Has read method(s) */ |
139 | #define FMODE_CAN_READ ((__force fmode_t)0x20000) | |
140 | /* Has write method(s) */ | |
141 | #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) | |
9c225f26 | 142 | |
bbc1096a | 143 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
75069f2b | 144 | #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
bbc1096a DH |
145 | |
146 | /* | |
147 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector | |
148 | * that indicates that they should check the contents of the iovec are | |
149 | * valid, but not check the memory that the iovec elements | |
150 | * points too. | |
151 | */ | |
152 | #define CHECK_IOVEC_ONLY -1 | |
153 | ||
1da177e4 LT |
154 | /* |
155 | * Attribute flags. These should be or-ed together to figure out what | |
156 | * has been changed! | |
157 | */ | |
9767d749 MS |
158 | #define ATTR_MODE (1 << 0) |
159 | #define ATTR_UID (1 << 1) | |
160 | #define ATTR_GID (1 << 2) | |
161 | #define ATTR_SIZE (1 << 3) | |
162 | #define ATTR_ATIME (1 << 4) | |
163 | #define ATTR_MTIME (1 << 5) | |
164 | #define ATTR_CTIME (1 << 6) | |
165 | #define ATTR_ATIME_SET (1 << 7) | |
166 | #define ATTR_MTIME_SET (1 << 8) | |
167 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
168 | #define ATTR_ATTR_FLAG (1 << 10) | |
169 | #define ATTR_KILL_SUID (1 << 11) | |
170 | #define ATTR_KILL_SGID (1 << 12) | |
171 | #define ATTR_FILE (1 << 13) | |
172 | #define ATTR_KILL_PRIV (1 << 14) | |
173 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
174 | #define ATTR_TIMES_SET (1 << 16) | |
f2b20f6e | 175 | #define ATTR_TOUCH (1 << 17) |
1da177e4 | 176 | |
787fb6bc MS |
177 | /* |
178 | * Whiteout is represented by a char device. The following constants define the | |
179 | * mode and device number to use. | |
180 | */ | |
181 | #define WHITEOUT_MODE 0 | |
182 | #define WHITEOUT_DEV 0 | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * This is the Inode Attributes structure, used for notify_change(). It | |
186 | * uses the above definitions as flags, to know which values have changed. | |
187 | * Also, in this manner, a Filesystem can look at only the values it cares | |
188 | * about. Basically, these are the attributes that the VFS layer can | |
189 | * request to change from the FS layer. | |
190 | * | |
191 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
192 | */ | |
193 | struct iattr { | |
194 | unsigned int ia_valid; | |
195 | umode_t ia_mode; | |
92361636 EB |
196 | kuid_t ia_uid; |
197 | kgid_t ia_gid; | |
1da177e4 LT |
198 | loff_t ia_size; |
199 | struct timespec ia_atime; | |
200 | struct timespec ia_mtime; | |
201 | struct timespec ia_ctime; | |
cc4e69de MS |
202 | |
203 | /* | |
25985edc | 204 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
205 | * implement an ftruncate() like method. NOTE: filesystem should |
206 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
207 | */ | |
208 | struct file *ia_file; | |
1da177e4 LT |
209 | }; |
210 | ||
1da177e4 LT |
211 | /* |
212 | * Includes for diskquotas. | |
213 | */ | |
214 | #include <linux/quota.h> | |
215 | ||
69c433ed MS |
216 | /* |
217 | * Maximum number of layers of fs stack. Needs to be limited to | |
218 | * prevent kernel stack overflow | |
219 | */ | |
220 | #define FILESYSTEM_MAX_STACK_DEPTH 2 | |
221 | ||
994fc28c ZB |
222 | /** |
223 | * enum positive_aop_returns - aop return codes with specific semantics | |
224 | * | |
225 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
226 | * completed, that the page is still locked, and | |
227 | * should be considered active. The VM uses this hint | |
228 | * to return the page to the active list -- it won't | |
229 | * be a candidate for writeback again in the near | |
230 | * future. Other callers must be careful to unlock | |
231 | * the page if they get this return. Returned by | |
232 | * writepage(); | |
233 | * | |
234 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
235 | * unlocked it and the page might have been truncated. | |
236 | * The caller should back up to acquiring a new page and | |
237 | * trying again. The aop will be taking reasonable | |
238 | * precautions not to livelock. If the caller held a page | |
239 | * reference, it should drop it before retrying. Returned | |
55144768 | 240 | * by readpage(). |
994fc28c ZB |
241 | * |
242 | * address_space_operation functions return these large constants to indicate | |
243 | * special semantics to the caller. These are much larger than the bytes in a | |
244 | * page to allow for functions that return the number of bytes operated on in a | |
245 | * given page. | |
246 | */ | |
247 | ||
248 | enum positive_aop_returns { | |
249 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
250 | AOP_TRUNCATED_PAGE = 0x80001, | |
251 | }; | |
252 | ||
afddba49 | 253 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
89e10787 | 254 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
54566b2c NP |
255 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
256 | * helper code (eg buffer layer) | |
257 | * to clear GFP_FS from alloc */ | |
afddba49 | 258 | |
1da177e4 LT |
259 | /* |
260 | * oh the beauties of C type declarations. | |
261 | */ | |
262 | struct page; | |
263 | struct address_space; | |
264 | struct writeback_control; | |
1da177e4 | 265 | |
e2e40f2c | 266 | #define IOCB_EVENTFD (1 << 0) |
2ba48ce5 AV |
267 | #define IOCB_APPEND (1 << 1) |
268 | #define IOCB_DIRECT (1 << 2) | |
97be7ebe | 269 | #define IOCB_HIPRI (1 << 3) |
dde0c2e7 CH |
270 | #define IOCB_DSYNC (1 << 4) |
271 | #define IOCB_SYNC (1 << 5) | |
70fe2f48 | 272 | #define IOCB_WRITE (1 << 6) |
e2e40f2c CH |
273 | |
274 | struct kiocb { | |
275 | struct file *ki_filp; | |
276 | loff_t ki_pos; | |
277 | void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); | |
278 | void *private; | |
279 | int ki_flags; | |
280 | }; | |
281 | ||
282 | static inline bool is_sync_kiocb(struct kiocb *kiocb) | |
283 | { | |
284 | return kiocb->ki_complete == NULL; | |
285 | } | |
286 | ||
2ba48ce5 AV |
287 | static inline int iocb_flags(struct file *file); |
288 | ||
e2e40f2c CH |
289 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) |
290 | { | |
291 | *kiocb = (struct kiocb) { | |
292 | .ki_filp = filp, | |
2ba48ce5 | 293 | .ki_flags = iocb_flags(filp), |
e2e40f2c CH |
294 | }; |
295 | } | |
296 | ||
8ab22b9a HH |
297 | /* |
298 | * "descriptor" for what we're up to with a read. | |
299 | * This allows us to use the same read code yet | |
300 | * have multiple different users of the data that | |
301 | * we read from a file. | |
302 | * | |
303 | * The simplest case just copies the data to user | |
304 | * mode. | |
305 | */ | |
306 | typedef struct { | |
307 | size_t written; | |
308 | size_t count; | |
309 | union { | |
310 | char __user *buf; | |
311 | void *data; | |
312 | } arg; | |
313 | int error; | |
314 | } read_descriptor_t; | |
315 | ||
316 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
317 | unsigned long, unsigned long); | |
2f718ffc | 318 | |
1da177e4 LT |
319 | struct address_space_operations { |
320 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
321 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
322 | |
323 | /* Write back some dirty pages from this mapping. */ | |
324 | int (*writepages)(struct address_space *, struct writeback_control *); | |
325 | ||
4741c9fd | 326 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
327 | int (*set_page_dirty)(struct page *page); |
328 | ||
329 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
330 | struct list_head *pages, unsigned nr_pages); | |
331 | ||
afddba49 NP |
332 | int (*write_begin)(struct file *, struct address_space *mapping, |
333 | loff_t pos, unsigned len, unsigned flags, | |
334 | struct page **pagep, void **fsdata); | |
335 | int (*write_end)(struct file *, struct address_space *mapping, | |
336 | loff_t pos, unsigned len, unsigned copied, | |
337 | struct page *page, void *fsdata); | |
338 | ||
1da177e4 LT |
339 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
340 | sector_t (*bmap)(struct address_space *, sector_t); | |
d47992f8 | 341 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
27496a8c | 342 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 343 | void (*freepage)(struct page *); |
c8b8e32d | 344 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); |
b969c4ab | 345 | /* |
ef277c73 TC |
346 | * migrate the contents of a page to the specified target. If |
347 | * migrate_mode is MIGRATE_ASYNC, it must not block. | |
b969c4ab | 348 | */ |
2d1db3b1 | 349 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 350 | struct page *, struct page *, enum migrate_mode); |
bda807d4 MK |
351 | bool (*isolate_page)(struct page *, isolate_mode_t); |
352 | void (*putback_page)(struct page *); | |
e3db7691 | 353 | int (*launder_page) (struct page *); |
c186afb4 | 354 | int (*is_partially_uptodate) (struct page *, unsigned long, |
8ab22b9a | 355 | unsigned long); |
b4597226 | 356 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
25718736 | 357 | int (*error_remove_page)(struct address_space *, struct page *); |
62c230bc MG |
358 | |
359 | /* swapfile support */ | |
a509bc1a MG |
360 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
361 | sector_t *span); | |
362 | void (*swap_deactivate)(struct file *file); | |
1da177e4 LT |
363 | }; |
364 | ||
7dcda1c9 JA |
365 | extern const struct address_space_operations empty_aops; |
366 | ||
afddba49 NP |
367 | /* |
368 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
369 | * to write into the pagecache. | |
370 | */ | |
371 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
372 | loff_t pos, unsigned len, unsigned flags, | |
373 | struct page **pagep, void **fsdata); | |
374 | ||
375 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
376 | loff_t pos, unsigned len, unsigned copied, | |
377 | struct page *page, void *fsdata); | |
378 | ||
1da177e4 LT |
379 | struct address_space { |
380 | struct inode *host; /* owner: inode, block_device */ | |
381 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
19fd6231 | 382 | spinlock_t tree_lock; /* and lock protecting it */ |
4bb5f5d9 | 383 | atomic_t i_mmap_writable;/* count VM_SHARED mappings */ |
6b2dbba8 | 384 | struct rb_root i_mmap; /* tree of private and shared mappings */ |
c8c06efa | 385 | struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ |
08142579 | 386 | /* Protected by tree_lock together with the radix tree */ |
1da177e4 | 387 | unsigned long nrpages; /* number of total pages */ |
f9fe48be RZ |
388 | /* number of shadow or DAX exceptional entries */ |
389 | unsigned long nrexceptional; | |
1da177e4 | 390 | pgoff_t writeback_index;/* writeback starts here */ |
f5e54d6e | 391 | const struct address_space_operations *a_ops; /* methods */ |
9c5d760b | 392 | unsigned long flags; /* error bits */ |
1da177e4 | 393 | spinlock_t private_lock; /* for use by the address_space */ |
9c5d760b | 394 | gfp_t gfp_mask; /* implicit gfp mask for allocations */ |
1da177e4 | 395 | struct list_head private_list; /* ditto */ |
252aa6f5 | 396 | void *private_data; /* ditto */ |
1da177e4 LT |
397 | } __attribute__((aligned(sizeof(long)))); |
398 | /* | |
399 | * On most architectures that alignment is already the case; but | |
25985edc | 400 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
401 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
402 | */ | |
87192a2a | 403 | struct request_queue; |
1da177e4 LT |
404 | |
405 | struct block_device { | |
406 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 407 | int bd_openers; |
1da177e4 | 408 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 409 | struct super_block * bd_super; |
c039e313 | 410 | struct mutex bd_mutex; /* open/close mutex */ |
6b4517a7 | 411 | void * bd_claiming; |
1da177e4 LT |
412 | void * bd_holder; |
413 | int bd_holders; | |
77ea887e | 414 | bool bd_write_holder; |
641dc636 | 415 | #ifdef CONFIG_SYSFS |
49731baa | 416 | struct list_head bd_holder_disks; |
641dc636 | 417 | #endif |
1da177e4 LT |
418 | struct block_device * bd_contains; |
419 | unsigned bd_block_size; | |
420 | struct hd_struct * bd_part; | |
421 | /* number of times partitions within this device have been opened. */ | |
422 | unsigned bd_part_count; | |
423 | int bd_invalidated; | |
424 | struct gendisk * bd_disk; | |
87192a2a | 425 | struct request_queue * bd_queue; |
1da177e4 | 426 | struct list_head bd_list; |
1da177e4 LT |
427 | /* |
428 | * Private data. You must have bd_claim'ed the block_device | |
429 | * to use this. NOTE: bd_claim allows an owner to claim | |
430 | * the same device multiple times, the owner must take special | |
431 | * care to not mess up bd_private for that case. | |
432 | */ | |
433 | unsigned long bd_private; | |
fcccf502 TS |
434 | |
435 | /* The counter of freeze processes */ | |
436 | int bd_fsfreeze_count; | |
437 | /* Mutex for freeze */ | |
438 | struct mutex bd_fsfreeze_mutex; | |
1da177e4 LT |
439 | }; |
440 | ||
441 | /* | |
442 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
443 | * radix trees | |
444 | */ | |
445 | #define PAGECACHE_TAG_DIRTY 0 | |
446 | #define PAGECACHE_TAG_WRITEBACK 1 | |
f446daae | 447 | #define PAGECACHE_TAG_TOWRITE 2 |
1da177e4 LT |
448 | |
449 | int mapping_tagged(struct address_space *mapping, int tag); | |
450 | ||
8b28f621 DB |
451 | static inline void i_mmap_lock_write(struct address_space *mapping) |
452 | { | |
c8c06efa | 453 | down_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
454 | } |
455 | ||
456 | static inline void i_mmap_unlock_write(struct address_space *mapping) | |
457 | { | |
c8c06efa | 458 | up_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
459 | } |
460 | ||
3dec0ba0 DB |
461 | static inline void i_mmap_lock_read(struct address_space *mapping) |
462 | { | |
463 | down_read(&mapping->i_mmap_rwsem); | |
464 | } | |
465 | ||
466 | static inline void i_mmap_unlock_read(struct address_space *mapping) | |
467 | { | |
468 | up_read(&mapping->i_mmap_rwsem); | |
469 | } | |
470 | ||
1da177e4 LT |
471 | /* |
472 | * Might pages of this file be mapped into userspace? | |
473 | */ | |
474 | static inline int mapping_mapped(struct address_space *mapping) | |
475 | { | |
27ba0644 | 476 | return !RB_EMPTY_ROOT(&mapping->i_mmap); |
1da177e4 LT |
477 | } |
478 | ||
479 | /* | |
480 | * Might pages of this file have been modified in userspace? | |
481 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
482 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
483 | * writing i.e. vma may be mprotected writable even if now readonly. | |
4bb5f5d9 DH |
484 | * |
485 | * If i_mmap_writable is negative, no new writable mappings are allowed. You | |
486 | * can only deny writable mappings, if none exists right now. | |
1da177e4 LT |
487 | */ |
488 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
489 | { | |
4bb5f5d9 DH |
490 | return atomic_read(&mapping->i_mmap_writable) > 0; |
491 | } | |
492 | ||
493 | static inline int mapping_map_writable(struct address_space *mapping) | |
494 | { | |
495 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? | |
496 | 0 : -EPERM; | |
497 | } | |
498 | ||
499 | static inline void mapping_unmap_writable(struct address_space *mapping) | |
500 | { | |
501 | atomic_dec(&mapping->i_mmap_writable); | |
502 | } | |
503 | ||
504 | static inline int mapping_deny_writable(struct address_space *mapping) | |
505 | { | |
506 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? | |
507 | 0 : -EBUSY; | |
508 | } | |
509 | ||
510 | static inline void mapping_allow_writable(struct address_space *mapping) | |
511 | { | |
512 | atomic_inc(&mapping->i_mmap_writable); | |
1da177e4 LT |
513 | } |
514 | ||
515 | /* | |
516 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
517 | */ | |
518 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
519 | #include <linux/seqlock.h> | |
520 | #define __NEED_I_SIZE_ORDERED | |
521 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
522 | #else | |
523 | #define i_size_ordered_init(inode) do { } while (0) | |
524 | #endif | |
525 | ||
f19d4a8f AV |
526 | struct posix_acl; |
527 | #define ACL_NOT_CACHED ((void *)(-1)) | |
2a3a2a3f | 528 | #define ACL_DONT_CACHE ((void *)(-3)) |
f19d4a8f | 529 | |
b8a7a3a6 AG |
530 | static inline struct posix_acl * |
531 | uncached_acl_sentinel(struct task_struct *task) | |
532 | { | |
533 | return (void *)task + 1; | |
534 | } | |
535 | ||
536 | static inline bool | |
537 | is_uncached_acl(struct posix_acl *acl) | |
538 | { | |
539 | return (long)acl & 1; | |
540 | } | |
541 | ||
3ddcd056 LT |
542 | #define IOP_FASTPERM 0x0001 |
543 | #define IOP_LOOKUP 0x0002 | |
544 | #define IOP_NOFOLLOW 0x0004 | |
d0a5b995 | 545 | #define IOP_XATTR 0x0008 |
76fca90e | 546 | #define IOP_DEFAULT_READLINK 0x0010 |
3ddcd056 LT |
547 | |
548 | /* | |
549 | * Keep mostly read-only and often accessed (especially for | |
550 | * the RCU path lookup and 'stat' data) fields at the beginning | |
551 | * of the 'struct inode' | |
552 | */ | |
1da177e4 | 553 | struct inode { |
44a7d7a8 | 554 | umode_t i_mode; |
3ddcd056 | 555 | unsigned short i_opflags; |
92361636 EB |
556 | kuid_t i_uid; |
557 | kgid_t i_gid; | |
3ddcd056 LT |
558 | unsigned int i_flags; |
559 | ||
560 | #ifdef CONFIG_FS_POSIX_ACL | |
561 | struct posix_acl *i_acl; | |
562 | struct posix_acl *i_default_acl; | |
563 | #endif | |
564 | ||
44a7d7a8 NP |
565 | const struct inode_operations *i_op; |
566 | struct super_block *i_sb; | |
3ddcd056 | 567 | struct address_space *i_mapping; |
44a7d7a8 | 568 | |
13e12d14 LT |
569 | #ifdef CONFIG_SECURITY |
570 | void *i_security; | |
571 | #endif | |
44a7d7a8 | 572 | |
3ddcd056 LT |
573 | /* Stat data, not accessed from path walking */ |
574 | unsigned long i_ino; | |
a78ef704 MS |
575 | /* |
576 | * Filesystems may only read i_nlink directly. They shall use the | |
577 | * following functions for modification: | |
578 | * | |
579 | * (set|clear|inc|drop)_nlink | |
580 | * inode_(inc|dec)_link_count | |
581 | */ | |
582 | union { | |
583 | const unsigned int i_nlink; | |
584 | unsigned int __i_nlink; | |
585 | }; | |
3ddcd056 | 586 | dev_t i_rdev; |
2f9d3df8 | 587 | loff_t i_size; |
3ddcd056 LT |
588 | struct timespec i_atime; |
589 | struct timespec i_mtime; | |
590 | struct timespec i_ctime; | |
6cdbb0ef TT |
591 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
592 | unsigned short i_bytes; | |
2f9d3df8 | 593 | unsigned int i_blkbits; |
3ddcd056 LT |
594 | blkcnt_t i_blocks; |
595 | ||
596 | #ifdef __NEED_I_SIZE_ORDERED | |
597 | seqcount_t i_size_seqcount; | |
598 | #endif | |
599 | ||
600 | /* Misc */ | |
601 | unsigned long i_state; | |
9902af79 | 602 | struct rw_semaphore i_rwsem; |
13e12d14 | 603 | |
44a7d7a8 | 604 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
a2f48706 | 605 | unsigned long dirtied_time_when; |
44a7d7a8 | 606 | |
1da177e4 | 607 | struct hlist_node i_hash; |
c7f54084 | 608 | struct list_head i_io_list; /* backing dev IO list */ |
52ebea74 TH |
609 | #ifdef CONFIG_CGROUP_WRITEBACK |
610 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ | |
2a814908 TH |
611 | |
612 | /* foreign inode detection, see wbc_detach_inode() */ | |
613 | int i_wb_frn_winner; | |
614 | u16 i_wb_frn_avg_time; | |
615 | u16 i_wb_frn_history; | |
52ebea74 | 616 | #endif |
7ccf19a8 | 617 | struct list_head i_lru; /* inode LRU list */ |
1da177e4 | 618 | struct list_head i_sb_list; |
6c60d2b5 | 619 | struct list_head i_wb_list; /* backing dev writeback list */ |
fa0d7e3d | 620 | union { |
b3d9b7a3 | 621 | struct hlist_head i_dentry; |
fa0d7e3d NP |
622 | struct rcu_head i_rcu; |
623 | }; | |
7a224228 | 624 | u64 i_version; |
2f9d3df8 | 625 | atomic_t i_count; |
bd5fe6c5 | 626 | atomic_t i_dio_count; |
6cdbb0ef | 627 | atomic_t i_writecount; |
d984ea60 MZ |
628 | #ifdef CONFIG_IMA |
629 | atomic_t i_readcount; /* struct files open RO */ | |
630 | #endif | |
99ac48f5 | 631 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
4a075e39 | 632 | struct file_lock_context *i_flctx; |
1da177e4 | 633 | struct address_space i_data; |
1da177e4 | 634 | struct list_head i_devices; |
4c154168 TT |
635 | union { |
636 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 637 | struct block_device *i_bdev; |
577c4eb0 | 638 | struct cdev *i_cdev; |
61ba64fc | 639 | char *i_link; |
84e710da | 640 | unsigned i_dir_seq; |
4c154168 | 641 | }; |
1da177e4 LT |
642 | |
643 | __u32 i_generation; | |
644 | ||
3be25f49 EP |
645 | #ifdef CONFIG_FSNOTIFY |
646 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
e61ce867 | 647 | struct hlist_head i_fsnotify_marks; |
0eeca283 RL |
648 | #endif |
649 | ||
0b81d077 JK |
650 | #if IS_ENABLED(CONFIG_FS_ENCRYPTION) |
651 | struct fscrypt_info *i_crypt_info; | |
652 | #endif | |
653 | ||
8e18e294 | 654 | void *i_private; /* fs or device private pointer */ |
1da177e4 LT |
655 | }; |
656 | ||
1d3382cb AV |
657 | static inline int inode_unhashed(struct inode *inode) |
658 | { | |
659 | return hlist_unhashed(&inode->i_hash); | |
660 | } | |
661 | ||
f2eace23 IM |
662 | /* |
663 | * inode->i_mutex nesting subclasses for the lock validator: | |
664 | * | |
665 | * 0: the object of the current VFS operation | |
666 | * 1: parent | |
667 | * 2: child/target | |
40bd22c9 BF |
668 | * 3: xattr |
669 | * 4: second non-directory | |
d1b72cc6 MS |
670 | * 5: second parent (when locking independent directories in rename) |
671 | * | |
672 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two | |
40bd22c9 | 673 | * non-directories at once. |
f2eace23 IM |
674 | * |
675 | * The locking order between these classes is | |
d1b72cc6 | 676 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
f2eace23 IM |
677 | */ |
678 | enum inode_i_mutex_lock_class | |
679 | { | |
680 | I_MUTEX_NORMAL, | |
681 | I_MUTEX_PARENT, | |
682 | I_MUTEX_CHILD, | |
4df46240 | 683 | I_MUTEX_XATTR, |
d1b72cc6 MS |
684 | I_MUTEX_NONDIR2, |
685 | I_MUTEX_PARENT2, | |
f2eace23 IM |
686 | }; |
687 | ||
5955102c AV |
688 | static inline void inode_lock(struct inode *inode) |
689 | { | |
9902af79 | 690 | down_write(&inode->i_rwsem); |
5955102c AV |
691 | } |
692 | ||
693 | static inline void inode_unlock(struct inode *inode) | |
694 | { | |
9902af79 AV |
695 | up_write(&inode->i_rwsem); |
696 | } | |
697 | ||
698 | static inline void inode_lock_shared(struct inode *inode) | |
699 | { | |
700 | down_read(&inode->i_rwsem); | |
701 | } | |
702 | ||
703 | static inline void inode_unlock_shared(struct inode *inode) | |
704 | { | |
705 | up_read(&inode->i_rwsem); | |
5955102c AV |
706 | } |
707 | ||
708 | static inline int inode_trylock(struct inode *inode) | |
709 | { | |
9902af79 AV |
710 | return down_write_trylock(&inode->i_rwsem); |
711 | } | |
712 | ||
713 | static inline int inode_trylock_shared(struct inode *inode) | |
714 | { | |
715 | return down_read_trylock(&inode->i_rwsem); | |
5955102c AV |
716 | } |
717 | ||
718 | static inline int inode_is_locked(struct inode *inode) | |
719 | { | |
9902af79 | 720 | return rwsem_is_locked(&inode->i_rwsem); |
5955102c AV |
721 | } |
722 | ||
723 | static inline void inode_lock_nested(struct inode *inode, unsigned subclass) | |
724 | { | |
9902af79 | 725 | down_write_nested(&inode->i_rwsem, subclass); |
5955102c AV |
726 | } |
727 | ||
375e289e BF |
728 | void lock_two_nondirectories(struct inode *, struct inode*); |
729 | void unlock_two_nondirectories(struct inode *, struct inode*); | |
730 | ||
1da177e4 LT |
731 | /* |
732 | * NOTE: in a 32bit arch with a preemptable kernel and | |
733 | * an UP compile the i_size_read/write must be atomic | |
734 | * with respect to the local cpu (unlike with preempt disabled), | |
735 | * but they don't need to be atomic with respect to other cpus like in | |
736 | * true SMP (so they need either to either locally disable irq around | |
737 | * the read or for example on x86 they can be still implemented as a | |
738 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
739 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
740 | */ | |
48ed214d | 741 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
742 | { |
743 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
744 | loff_t i_size; | |
745 | unsigned int seq; | |
746 | ||
747 | do { | |
748 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
749 | i_size = inode->i_size; | |
750 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
751 | return i_size; | |
752 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
753 | loff_t i_size; | |
754 | ||
755 | preempt_disable(); | |
756 | i_size = inode->i_size; | |
757 | preempt_enable(); | |
758 | return i_size; | |
759 | #else | |
760 | return inode->i_size; | |
761 | #endif | |
762 | } | |
763 | ||
7762f5a0 MS |
764 | /* |
765 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
766 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
767 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
768 | */ | |
1da177e4 LT |
769 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
770 | { | |
771 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
74e3d1e1 | 772 | preempt_disable(); |
1da177e4 LT |
773 | write_seqcount_begin(&inode->i_size_seqcount); |
774 | inode->i_size = i_size; | |
775 | write_seqcount_end(&inode->i_size_seqcount); | |
74e3d1e1 | 776 | preempt_enable(); |
1da177e4 LT |
777 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
778 | preempt_disable(); | |
779 | inode->i_size = i_size; | |
780 | preempt_enable(); | |
781 | #else | |
782 | inode->i_size = i_size; | |
783 | #endif | |
784 | } | |
785 | ||
48ed214d | 786 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
787 | { |
788 | return MINOR(inode->i_rdev); | |
789 | } | |
790 | ||
48ed214d | 791 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
792 | { |
793 | return MAJOR(inode->i_rdev); | |
794 | } | |
795 | ||
796 | extern struct block_device *I_BDEV(struct inode *inode); | |
797 | ||
798 | struct fown_struct { | |
799 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
800 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
801 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
92361636 | 802 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
803 | int signum; /* posix.1b rt signal to be delivered on IO */ |
804 | }; | |
805 | ||
806 | /* | |
807 | * Track a single file's readahead state | |
808 | */ | |
809 | struct file_ra_state { | |
937085aa FW |
810 | pgoff_t start; /* where readahead started */ |
811 | unsigned int size; /* # of readahead pages */ | |
812 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 813 | there are only # of pages ahead */ |
5ce1110b | 814 | |
937085aa | 815 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 816 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 817 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 818 | }; |
1da177e4 | 819 | |
5ce1110b FW |
820 | /* |
821 | * Check if @index falls in the readahead windows. | |
822 | */ | |
823 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
824 | { | |
f9acc8c7 FW |
825 | return (index >= ra->start && |
826 | index < ra->start + ra->size); | |
5ce1110b FW |
827 | } |
828 | ||
1da177e4 | 829 | struct file { |
2f512016 | 830 | union { |
4f5e65a1 | 831 | struct llist_node fu_llist; |
2f512016 ED |
832 | struct rcu_head fu_rcuhead; |
833 | } f_u; | |
0f7fc9e4 | 834 | struct path f_path; |
dd37978c | 835 | struct inode *f_inode; /* cached value */ |
99ac48f5 | 836 | const struct file_operations *f_op; |
ef3d0fd2 AK |
837 | |
838 | /* | |
9c225f26 | 839 | * Protects f_ep_links, f_flags. |
ef3d0fd2 AK |
840 | * Must not be taken from IRQ context. |
841 | */ | |
842 | spinlock_t f_lock; | |
516e0cc5 | 843 | atomic_long_t f_count; |
1da177e4 | 844 | unsigned int f_flags; |
aeb5d727 | 845 | fmode_t f_mode; |
9c225f26 | 846 | struct mutex f_pos_lock; |
1da177e4 LT |
847 | loff_t f_pos; |
848 | struct fown_struct f_owner; | |
d76b0d9b | 849 | const struct cred *f_cred; |
1da177e4 LT |
850 | struct file_ra_state f_ra; |
851 | ||
2b47c361 | 852 | u64 f_version; |
50462062 | 853 | #ifdef CONFIG_SECURITY |
1da177e4 | 854 | void *f_security; |
50462062 | 855 | #endif |
1da177e4 LT |
856 | /* needed for tty driver, and maybe others */ |
857 | void *private_data; | |
858 | ||
859 | #ifdef CONFIG_EPOLL | |
860 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
861 | struct list_head f_ep_links; | |
28d82dc1 | 862 | struct list_head f_tfile_llink; |
1da177e4 LT |
863 | #endif /* #ifdef CONFIG_EPOLL */ |
864 | struct address_space *f_mapping; | |
bd2a31d5 | 865 | } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
1da177e4 | 866 | |
990d6c2d AK |
867 | struct file_handle { |
868 | __u32 handle_bytes; | |
869 | int handle_type; | |
870 | /* file identifier */ | |
871 | unsigned char f_handle[0]; | |
872 | }; | |
873 | ||
cb0942b8 AV |
874 | static inline struct file *get_file(struct file *f) |
875 | { | |
876 | atomic_long_inc(&f->f_count); | |
877 | return f; | |
878 | } | |
90f31d0e | 879 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
d7065da0 | 880 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
516e0cc5 | 881 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 LT |
882 | |
883 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
884 | ||
885 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
886 | limits, otherwise bad things can happen in VM. */ | |
887 | #if BITS_PER_LONG==32 | |
09cbfeaf | 888 | #define MAX_LFS_FILESIZE (((loff_t)PAGE_SIZE << (BITS_PER_LONG-1))-1) |
1da177e4 | 889 | #elif BITS_PER_LONG==64 |
614c321f | 890 | #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) |
1da177e4 LT |
891 | #endif |
892 | ||
893 | #define FL_POSIX 1 | |
894 | #define FL_FLOCK 2 | |
617588d5 | 895 | #define FL_DELEG 4 /* NFSv4 delegation */ |
1da177e4 | 896 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
f475ae95 | 897 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 898 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 899 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 900 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
901 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
902 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
cff2fce5 | 903 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
11afe9f7 | 904 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
1da177e4 | 905 | |
bde74e4b MS |
906 | /* |
907 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
908 | * asynchronous locking. | |
909 | */ | |
910 | #define FILE_LOCK_DEFERRED 1 | |
911 | ||
7ca76311 | 912 | /* legacy typedef, should eventually be removed */ |
17fa388d | 913 | typedef void *fl_owner_t; |
1da177e4 | 914 | |
a7231a97 JL |
915 | struct file_lock; |
916 | ||
1da177e4 | 917 | struct file_lock_operations { |
1da177e4 LT |
918 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
919 | void (*fl_release_private)(struct file_lock *); | |
920 | }; | |
921 | ||
922 | struct lock_manager_operations { | |
8fb47a4f | 923 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
3999e493 | 924 | unsigned long (*lm_owner_key)(struct file_lock *); |
cae80b30 JL |
925 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
926 | void (*lm_put_owner)(fl_owner_t); | |
8fb47a4f | 927 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
d0449b90 | 928 | int (*lm_grant)(struct file_lock *, int); |
4d01b7f5 | 929 | bool (*lm_break)(struct file_lock *); |
7448cc37 | 930 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
1c7dd2ff | 931 | void (*lm_setup)(struct file_lock *, void **); |
1da177e4 LT |
932 | }; |
933 | ||
af558e33 BF |
934 | struct lock_manager { |
935 | struct list_head list; | |
c87fb4a3 BF |
936 | /* |
937 | * NFSv4 and up also want opens blocked during the grace period; | |
938 | * NLM doesn't care: | |
939 | */ | |
940 | bool block_opens; | |
af558e33 BF |
941 | }; |
942 | ||
5ccb0066 SK |
943 | struct net; |
944 | void locks_start_grace(struct net *, struct lock_manager *); | |
af558e33 | 945 | void locks_end_grace(struct lock_manager *); |
5ccb0066 | 946 | int locks_in_grace(struct net *); |
c87fb4a3 | 947 | int opens_in_grace(struct net *); |
af558e33 | 948 | |
1da177e4 LT |
949 | /* that will die - we need it for nfs_lock_info */ |
950 | #include <linux/nfs_fs_i.h> | |
951 | ||
1cb36012 JL |
952 | /* |
953 | * struct file_lock represents a generic "file lock". It's used to represent | |
954 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to | |
955 | * note that the same struct is used to represent both a request for a lock and | |
956 | * the lock itself, but the same object is never used for both. | |
957 | * | |
958 | * FIXME: should we create a separate "struct lock_request" to help distinguish | |
959 | * these two uses? | |
960 | * | |
8116bf4c | 961 | * The varous i_flctx lists are ordered by: |
1cb36012 | 962 | * |
8116bf4c JL |
963 | * 1) lock owner |
964 | * 2) lock range start | |
965 | * 3) lock range end | |
1cb36012 JL |
966 | * |
967 | * Obviously, the last two criteria only matter for POSIX locks. | |
968 | */ | |
1da177e4 LT |
969 | struct file_lock { |
970 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
6dee60f6 | 971 | struct list_head fl_list; /* link into file_lock_context */ |
139ca04e | 972 | struct hlist_node fl_link; /* node in global lists */ |
1da177e4 LT |
973 | struct list_head fl_block; /* circular list of blocked processes */ |
974 | fl_owner_t fl_owner; | |
710b7216 | 975 | unsigned int fl_flags; |
afc1246f | 976 | unsigned char fl_type; |
1da177e4 | 977 | unsigned int fl_pid; |
7012b02a | 978 | int fl_link_cpu; /* what cpu's list is this on? */ |
ab1f1611 | 979 | struct pid *fl_nspid; |
1da177e4 LT |
980 | wait_queue_head_t fl_wait; |
981 | struct file *fl_file; | |
1da177e4 LT |
982 | loff_t fl_start; |
983 | loff_t fl_end; | |
984 | ||
985 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
986 | /* for lease breaks: */ |
987 | unsigned long fl_break_time; | |
988 | unsigned long fl_downgrade_time; | |
1da177e4 | 989 | |
6aed6285 | 990 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 991 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
992 | union { |
993 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 994 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
995 | struct { |
996 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
997 | int state; /* state of grant or error if -ve */ | |
998 | } afs; | |
1da177e4 LT |
999 | } fl_u; |
1000 | }; | |
1001 | ||
4a075e39 | 1002 | struct file_lock_context { |
6109c850 | 1003 | spinlock_t flc_lock; |
4a075e39 | 1004 | struct list_head flc_flock; |
bd61e0a9 | 1005 | struct list_head flc_posix; |
8634b51f | 1006 | struct list_head flc_lease; |
4a075e39 JL |
1007 | }; |
1008 | ||
1da177e4 LT |
1009 | /* The following constant reflects the upper bound of the file/locking space */ |
1010 | #ifndef OFFSET_MAX | |
1011 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1012 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1013 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1014 | #endif | |
1015 | ||
1da177e4 LT |
1016 | #include <linux/fcntl.h> |
1017 | ||
bfcd17a6 TP |
1018 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1019 | ||
c568d683 MS |
1020 | /* |
1021 | * Return the inode to use for locking | |
1022 | * | |
1023 | * For overlayfs this should be the overlay inode, not the real inode returned | |
1024 | * by file_inode(). For any other fs file_inode(filp) and locks_inode(filp) are | |
1025 | * equal. | |
1026 | */ | |
1027 | static inline struct inode *locks_inode(const struct file *f) | |
1028 | { | |
1029 | return f->f_path.dentry->d_inode; | |
1030 | } | |
1031 | ||
bfcd17a6 | 1032 | #ifdef CONFIG_FILE_LOCKING |
c1e62b8f | 1033 | extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *); |
c293621b PS |
1034 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
1035 | struct flock __user *); | |
1da177e4 LT |
1036 | |
1037 | #if BITS_PER_LONG == 32 | |
c1e62b8f | 1038 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *); |
c293621b PS |
1039 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1040 | struct flock64 __user *); | |
1da177e4 LT |
1041 | #endif |
1042 | ||
1da177e4 LT |
1043 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1044 | extern int fcntl_getlease(struct file *filp); | |
1045 | ||
1046 | /* fs/locks.c */ | |
f27a0fe0 | 1047 | void locks_free_lock_context(struct inode *inode); |
05fa3135 | 1048 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1049 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1050 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1051 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
3fe0fff1 | 1052 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
1da177e4 | 1053 | extern void locks_remove_posix(struct file *, fl_owner_t); |
78ed8a13 | 1054 | extern void locks_remove_file(struct file *); |
a9e61e25 | 1055 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1056 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1057 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
f891a29f | 1058 | extern int posix_unblock_lock(struct file_lock *); |
3ee17abd | 1059 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1060 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1061 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
e55c34a6 | 1062 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
df4e8d2c | 1063 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
1da177e4 | 1064 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
e6f5c789 JL |
1065 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
1066 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); | |
7448cc37 | 1067 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
6c8c9031 AV |
1068 | struct files_struct; |
1069 | extern void show_fd_locks(struct seq_file *f, | |
1070 | struct file *filp, struct files_struct *files); | |
bfcd17a6 | 1071 | #else /* !CONFIG_FILE_LOCKING */ |
c1e62b8f JL |
1072 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
1073 | struct flock __user *user) | |
c2aca5e5 SW |
1074 | { |
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
1078 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1079 | unsigned int cmd, struct flock __user *user) | |
1080 | { | |
1081 | return -EACCES; | |
1082 | } | |
1083 | ||
bfcd17a6 | 1084 | #if BITS_PER_LONG == 32 |
c1e62b8f JL |
1085 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
1086 | struct flock64 __user *user) | |
c2aca5e5 SW |
1087 | { |
1088 | return -EINVAL; | |
1089 | } | |
1090 | ||
1091 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1092 | unsigned int cmd, struct flock64 __user *user) | |
1093 | { | |
1094 | return -EACCES; | |
1095 | } | |
bfcd17a6 | 1096 | #endif |
c2aca5e5 SW |
1097 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1098 | { | |
1b2b32dc | 1099 | return -EINVAL; |
c2aca5e5 SW |
1100 | } |
1101 | ||
1102 | static inline int fcntl_getlease(struct file *filp) | |
1103 | { | |
1b2b32dc | 1104 | return F_UNLCK; |
c2aca5e5 SW |
1105 | } |
1106 | ||
4a075e39 | 1107 | static inline void |
f27a0fe0 | 1108 | locks_free_lock_context(struct inode *inode) |
4a075e39 JL |
1109 | { |
1110 | } | |
1111 | ||
c2aca5e5 SW |
1112 | static inline void locks_init_lock(struct file_lock *fl) |
1113 | { | |
1114 | return; | |
1115 | } | |
1116 | ||
3fe0fff1 | 1117 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
c2aca5e5 SW |
1118 | { |
1119 | return; | |
1120 | } | |
1121 | ||
1122 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1123 | { | |
1124 | return; | |
1125 | } | |
1126 | ||
1127 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1128 | { | |
1129 | return; | |
1130 | } | |
1131 | ||
78ed8a13 | 1132 | static inline void locks_remove_file(struct file *filp) |
c2aca5e5 SW |
1133 | { |
1134 | return; | |
1135 | } | |
1136 | ||
1137 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1138 | { | |
1139 | return; | |
1140 | } | |
1141 | ||
1142 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1143 | struct file_lock *conflock) | |
1144 | { | |
1145 | return -ENOLCK; | |
1146 | } | |
1147 | ||
f891a29f | 1148 | static inline int posix_unblock_lock(struct file_lock *waiter) |
c2aca5e5 SW |
1149 | { |
1150 | return -ENOENT; | |
1151 | } | |
1152 | ||
1153 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1154 | { | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1159 | struct file_lock *fl, struct file_lock *conf) | |
1160 | { | |
1161 | return -ENOLCK; | |
1162 | } | |
1163 | ||
1164 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1165 | { | |
1166 | return 0; | |
1167 | } | |
1168 | ||
e55c34a6 BC |
1169 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
1170 | { | |
1171 | return -ENOLCK; | |
1172 | } | |
1173 | ||
df4e8d2c | 1174 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
c2aca5e5 SW |
1175 | { |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) | |
1180 | { | |
1181 | return; | |
1182 | } | |
1183 | ||
1184 | static inline int generic_setlease(struct file *filp, long arg, | |
e6f5c789 | 1185 | struct file_lock **flp, void **priv) |
c2aca5e5 SW |
1186 | { |
1187 | return -EINVAL; | |
1188 | } | |
1189 | ||
1190 | static inline int vfs_setlease(struct file *filp, long arg, | |
e6f5c789 | 1191 | struct file_lock **lease, void **priv) |
c2aca5e5 SW |
1192 | { |
1193 | return -EINVAL; | |
1194 | } | |
1195 | ||
7448cc37 | 1196 | static inline int lease_modify(struct file_lock *fl, int arg, |
c45198ed | 1197 | struct list_head *dispose) |
c2aca5e5 SW |
1198 | { |
1199 | return -EINVAL; | |
1200 | } | |
6c8c9031 AV |
1201 | |
1202 | struct files_struct; | |
1203 | static inline void show_fd_locks(struct seq_file *f, | |
1204 | struct file *filp, struct files_struct *files) {} | |
bfcd17a6 TP |
1205 | #endif /* !CONFIG_FILE_LOCKING */ |
1206 | ||
ee296d7c JL |
1207 | static inline struct inode *file_inode(const struct file *f) |
1208 | { | |
1209 | return f->f_inode; | |
1210 | } | |
1211 | ||
d101a125 MS |
1212 | static inline struct dentry *file_dentry(const struct file *file) |
1213 | { | |
2d902671 | 1214 | return d_real(file->f_path.dentry, file_inode(file), 0); |
d101a125 MS |
1215 | } |
1216 | ||
e55c34a6 BC |
1217 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
1218 | { | |
c568d683 | 1219 | return locks_lock_inode_wait(locks_inode(filp), fl); |
e55c34a6 BC |
1220 | } |
1221 | ||
1da177e4 | 1222 | struct fasync_struct { |
989a2979 ED |
1223 | spinlock_t fa_lock; |
1224 | int magic; | |
1225 | int fa_fd; | |
1226 | struct fasync_struct *fa_next; /* singly linked list */ | |
1227 | struct file *fa_file; | |
1228 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1229 | }; |
1230 | ||
1231 | #define FASYNC_MAGIC 0x4601 | |
1232 | ||
1233 | /* SMP safe fasync helpers: */ | |
1234 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1235 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1236 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1237 | extern struct fasync_struct *fasync_alloc(void); | |
1238 | extern void fasync_free(struct fasync_struct *); | |
1239 | ||
1da177e4 LT |
1240 | /* can be called from interrupts */ |
1241 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1242 | |
e0b93edd JL |
1243 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1244 | extern void f_setown(struct file *filp, unsigned long arg, int force); | |
1da177e4 | 1245 | extern void f_delown(struct file *filp); |
609d7fa9 | 1246 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1247 | extern int send_sigurg(struct fown_struct *fown); |
1248 | ||
5accdf82 JK |
1249 | struct mm_struct; |
1250 | ||
1da177e4 LT |
1251 | /* |
1252 | * Umount options | |
1253 | */ | |
1254 | ||
1255 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1256 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1257 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1258 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1259 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 | 1260 | |
46b15caa TH |
1261 | /* sb->s_iflags */ |
1262 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ | |
90f8572b | 1263 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
a2982cc9 | 1264 | #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */ |
1da177e4 | 1265 | |
8654df4e EB |
1266 | /* sb->s_iflags to limit user namespace mounts */ |
1267 | #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */ | |
1da177e4 | 1268 | |
5accdf82 JK |
1269 | /* Possible states of 'frozen' field */ |
1270 | enum { | |
1271 | SB_UNFROZEN = 0, /* FS is unfrozen */ | |
1272 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ | |
5accdf82 JK |
1273 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1274 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop | |
1275 | * internal threads if needed) */ | |
1276 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ | |
1277 | }; | |
1278 | ||
1279 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) | |
1280 | ||
1281 | struct sb_writers { | |
8129ed29 ON |
1282 | int frozen; /* Is sb frozen? */ |
1283 | wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ | |
1284 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; | |
5accdf82 JK |
1285 | }; |
1286 | ||
1da177e4 LT |
1287 | struct super_block { |
1288 | struct list_head s_list; /* Keep this first */ | |
1289 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
270ba5f7 RK |
1290 | unsigned char s_blocksize_bits; |
1291 | unsigned long s_blocksize; | |
42cb56ae | 1292 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1293 | struct file_system_type *s_type; |
ee9b6d61 | 1294 | const struct super_operations *s_op; |
61e225dc | 1295 | const struct dquot_operations *dq_op; |
0d54b217 | 1296 | const struct quotactl_ops *s_qcop; |
39655164 | 1297 | const struct export_operations *s_export_op; |
1da177e4 | 1298 | unsigned long s_flags; |
46b15caa | 1299 | unsigned long s_iflags; /* internal SB_I_* flags */ |
1da177e4 LT |
1300 | unsigned long s_magic; |
1301 | struct dentry *s_root; | |
1302 | struct rw_semaphore s_umount; | |
1da177e4 | 1303 | int s_count; |
1da177e4 | 1304 | atomic_t s_active; |
50462062 | 1305 | #ifdef CONFIG_SECURITY |
1da177e4 | 1306 | void *s_security; |
50462062 | 1307 | #endif |
bb435453 | 1308 | const struct xattr_handler **s_xattr; |
1da177e4 | 1309 | |
0b81d077 JK |
1310 | const struct fscrypt_operations *s_cop; |
1311 | ||
ceb5bdc2 | 1312 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
39f7c4db | 1313 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1da177e4 | 1314 | struct block_device *s_bdev; |
32a88aa1 | 1315 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1316 | struct mtd_info *s_mtd; |
a5166169 | 1317 | struct hlist_node s_instances; |
2c5f648a | 1318 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
1da177e4 LT |
1319 | struct quota_info s_dquot; /* Diskquota specific options */ |
1320 | ||
5accdf82 | 1321 | struct sb_writers s_writers; |
1da177e4 LT |
1322 | |
1323 | char s_id[32]; /* Informational name */ | |
0bba0169 | 1324 | u8 s_uuid[16]; /* UUID */ |
1da177e4 LT |
1325 | |
1326 | void *s_fs_info; /* Filesystem private info */ | |
8de52778 | 1327 | unsigned int s_max_links; |
30c40d2c | 1328 | fmode_t s_mode; |
1da177e4 | 1329 | |
270ba5f7 RK |
1330 | /* Granularity of c/m/atime in ns. |
1331 | Cannot be worse than a second */ | |
1332 | u32 s_time_gran; | |
1333 | ||
1da177e4 LT |
1334 | /* |
1335 | * The next field is for VFS *only*. No filesystems have any business | |
1336 | * even looking at it. You had been warned. | |
1337 | */ | |
a11f3a05 | 1338 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1339 | |
79c0b2df MS |
1340 | /* |
1341 | * Filesystem subtype. If non-empty the filesystem type field | |
1342 | * in /proc/mounts will be "type.subtype" | |
1343 | */ | |
1344 | char *s_subtype; | |
b3b304a2 MS |
1345 | |
1346 | /* | |
1347 | * Saved mount options for lazy filesystems using | |
1348 | * generic_show_options() | |
1349 | */ | |
4d2deb40 | 1350 | char __rcu *s_options; |
c8aebb0c | 1351 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1352 | |
1353 | /* | |
1354 | * Saved pool identifier for cleancache (-1 means none) | |
1355 | */ | |
1356 | int cleancache_poolid; | |
b0d40c92 DC |
1357 | |
1358 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1359 | |
7ada4db8 MS |
1360 | /* Number of inodes with nlink == 0 but still referenced */ |
1361 | atomic_long_t s_remove_count; | |
1362 | ||
4ed5e82f MS |
1363 | /* Being remounted read-only */ |
1364 | int s_readonly_remount; | |
7b7a8665 CH |
1365 | |
1366 | /* AIO completions deferred from interrupt context */ | |
1367 | struct workqueue_struct *s_dio_done_wq; | |
215752fc | 1368 | struct hlist_head s_pins; |
f6041567 | 1369 | |
6e4eab57 EB |
1370 | /* |
1371 | * Owning user namespace and default context in which to | |
1372 | * interpret filesystem uids, gids, quotas, device nodes, | |
1373 | * xattrs and security labels. | |
1374 | */ | |
1375 | struct user_namespace *s_user_ns; | |
1376 | ||
f6041567 DC |
1377 | /* |
1378 | * Keep the lru lists last in the structure so they always sit on their | |
1379 | * own individual cachelines. | |
1380 | */ | |
1381 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; | |
1382 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; | |
e2fec7c3 | 1383 | struct rcu_head rcu; |
853b39a7 | 1384 | struct work_struct destroy_work; |
69c433ed | 1385 | |
e97fedb9 | 1386 | struct mutex s_sync_lock; /* sync serialisation lock */ |
69c433ed MS |
1387 | |
1388 | /* | |
1389 | * Indicates how deep in a filesystem stack this SB is | |
1390 | */ | |
1391 | int s_stack_depth; | |
74278da9 DC |
1392 | |
1393 | /* s_inode_list_lock protects s_inodes */ | |
1394 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; | |
1395 | struct list_head s_inodes; /* all inodes */ | |
6c60d2b5 DC |
1396 | |
1397 | spinlock_t s_inode_wblist_lock; | |
1398 | struct list_head s_inodes_wb; /* writeback inodes */ | |
1da177e4 LT |
1399 | }; |
1400 | ||
81754357 SF |
1401 | /* Helper functions so that in most cases filesystems will |
1402 | * not need to deal directly with kuid_t and kgid_t and can | |
1403 | * instead deal with the raw numeric values that are stored | |
1404 | * in the filesystem. | |
1405 | */ | |
1406 | static inline uid_t i_uid_read(const struct inode *inode) | |
1407 | { | |
1408 | return from_kuid(inode->i_sb->s_user_ns, inode->i_uid); | |
1409 | } | |
1410 | ||
1411 | static inline gid_t i_gid_read(const struct inode *inode) | |
1412 | { | |
1413 | return from_kgid(inode->i_sb->s_user_ns, inode->i_gid); | |
1414 | } | |
1415 | ||
1416 | static inline void i_uid_write(struct inode *inode, uid_t uid) | |
1417 | { | |
1418 | inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid); | |
1419 | } | |
1420 | ||
1421 | static inline void i_gid_write(struct inode *inode, gid_t gid) | |
1422 | { | |
1423 | inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); | |
1424 | } | |
1425 | ||
1da177e4 | 1426 | extern struct timespec current_fs_time(struct super_block *sb); |
3cd88666 | 1427 | extern struct timespec current_time(struct inode *inode); |
1da177e4 LT |
1428 | |
1429 | /* | |
1430 | * Snapshotting support. | |
1431 | */ | |
1da177e4 | 1432 | |
5accdf82 JK |
1433 | void __sb_end_write(struct super_block *sb, int level); |
1434 | int __sb_start_write(struct super_block *sb, int level, bool wait); | |
1435 | ||
bee9182d | 1436 | #define __sb_writers_acquired(sb, lev) \ |
8129ed29 | 1437 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1438 | #define __sb_writers_release(sb, lev) \ |
8129ed29 | 1439 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1440 | |
5accdf82 JK |
1441 | /** |
1442 | * sb_end_write - drop write access to a superblock | |
1443 | * @sb: the super we wrote to | |
1444 | * | |
1445 | * Decrement number of writers to the filesystem. Wake up possible waiters | |
1446 | * wanting to freeze the filesystem. | |
1447 | */ | |
1448 | static inline void sb_end_write(struct super_block *sb) | |
1449 | { | |
1450 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1451 | } | |
1452 | ||
1453 | /** | |
1454 | * sb_end_pagefault - drop write access to a superblock from a page fault | |
1455 | * @sb: the super we wrote to | |
1456 | * | |
1457 | * Decrement number of processes handling write page fault to the filesystem. | |
1458 | * Wake up possible waiters wanting to freeze the filesystem. | |
1459 | */ | |
1460 | static inline void sb_end_pagefault(struct super_block *sb) | |
1461 | { | |
1462 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); | |
1463 | } | |
1464 | ||
1465 | /** | |
1466 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes | |
1467 | * @sb: the super we wrote to | |
1468 | * | |
1469 | * Decrement fs-internal number of writers to the filesystem. Wake up possible | |
1470 | * waiters wanting to freeze the filesystem. | |
1471 | */ | |
1472 | static inline void sb_end_intwrite(struct super_block *sb) | |
1473 | { | |
1474 | __sb_end_write(sb, SB_FREEZE_FS); | |
1475 | } | |
1476 | ||
1477 | /** | |
1478 | * sb_start_write - get write access to a superblock | |
1479 | * @sb: the super we write to | |
1480 | * | |
1481 | * When a process wants to write data or metadata to a file system (i.e. dirty | |
1482 | * a page or an inode), it should embed the operation in a sb_start_write() - | |
1483 | * sb_end_write() pair to get exclusion against file system freezing. This | |
1484 | * function increments number of writers preventing freezing. If the file | |
1485 | * system is already frozen, the function waits until the file system is | |
1486 | * thawed. | |
1487 | * | |
1488 | * Since freeze protection behaves as a lock, users have to preserve | |
1489 | * ordering of freeze protection and other filesystem locks. Generally, | |
1490 | * freeze protection should be the outermost lock. In particular, we have: | |
1491 | * | |
1492 | * sb_start_write | |
1493 | * -> i_mutex (write path, truncate, directory ops, ...) | |
1494 | * -> s_umount (freeze_super, thaw_super) | |
1495 | */ | |
1496 | static inline void sb_start_write(struct super_block *sb) | |
1497 | { | |
1498 | __sb_start_write(sb, SB_FREEZE_WRITE, true); | |
1499 | } | |
1500 | ||
1501 | static inline int sb_start_write_trylock(struct super_block *sb) | |
1502 | { | |
1503 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); | |
1504 | } | |
1505 | ||
1506 | /** | |
1507 | * sb_start_pagefault - get write access to a superblock from a page fault | |
1508 | * @sb: the super we write to | |
1509 | * | |
1510 | * When a process starts handling write page fault, it should embed the | |
1511 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get | |
1512 | * exclusion against file system freezing. This is needed since the page fault | |
1513 | * is going to dirty a page. This function increments number of running page | |
1514 | * faults preventing freezing. If the file system is already frozen, the | |
1515 | * function waits until the file system is thawed. | |
1516 | * | |
1517 | * Since page fault freeze protection behaves as a lock, users have to preserve | |
1518 | * ordering of freeze protection and other filesystem locks. It is advised to | |
1519 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault | |
1520 | * handling code implies lock dependency: | |
1521 | * | |
1522 | * mmap_sem | |
1523 | * -> sb_start_pagefault | |
1524 | */ | |
1525 | static inline void sb_start_pagefault(struct super_block *sb) | |
1526 | { | |
1527 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * sb_start_intwrite - get write access to a superblock for internal fs purposes | |
1532 | * @sb: the super we write to | |
1533 | * | |
1534 | * This is the third level of protection against filesystem freezing. It is | |
1535 | * free for use by a filesystem. The only requirement is that it must rank | |
1536 | * below sb_start_pagefault. | |
1537 | * | |
1538 | * For example filesystem can call sb_start_intwrite() when starting a | |
1539 | * transaction which somewhat eases handling of freezing for internal sources | |
1540 | * of filesystem changes (internal fs threads, discarding preallocation on file | |
1541 | * close, etc.). | |
1542 | */ | |
1543 | static inline void sb_start_intwrite(struct super_block *sb) | |
1544 | { | |
1545 | __sb_start_write(sb, SB_FREEZE_FS, true); | |
1546 | } | |
1da177e4 | 1547 | |
1da177e4 | 1548 | |
2e149670 | 1549 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1550 | |
1da177e4 LT |
1551 | /* |
1552 | * VFS helper functions.. | |
1553 | */ | |
312b63fb | 1554 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 1555 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1556 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1557 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
146a8595 | 1558 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
1da177e4 | 1559 | extern int vfs_rmdir(struct inode *, struct dentry *); |
b21996e3 | 1560 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
520c8b16 | 1561 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
787fb6bc | 1562 | extern int vfs_whiteout(struct inode *, struct dentry *); |
1da177e4 | 1563 | |
8c744fb8 CH |
1564 | /* |
1565 | * VFS file helper functions. | |
1566 | */ | |
a1bd120d | 1567 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1568 | umode_t mode); |
a2982cc9 | 1569 | extern bool may_open_dev(const struct path *path); |
c4b929b8 MF |
1570 | /* |
1571 | * VFS FS_IOC_FIEMAP helper definitions. | |
1572 | */ | |
1573 | struct fiemap_extent_info { | |
1574 | unsigned int fi_flags; /* Flags as passed from user */ | |
1575 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1576 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1577 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1578 | fiemap_extent array */ | |
c4b929b8 MF |
1579 | }; |
1580 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1581 | u64 phys, u64 len, u32 flags); | |
1582 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1583 | ||
1da177e4 LT |
1584 | /* |
1585 | * File types | |
1586 | * | |
1587 | * NOTE! These match bits 12..15 of stat.st_mode | |
1588 | * (ie "(i_mode >> 12) & 15"). | |
1589 | */ | |
1590 | #define DT_UNKNOWN 0 | |
1591 | #define DT_FIFO 1 | |
1592 | #define DT_CHR 2 | |
1593 | #define DT_DIR 4 | |
1594 | #define DT_BLK 6 | |
1595 | #define DT_REG 8 | |
1596 | #define DT_LNK 10 | |
1597 | #define DT_SOCK 12 | |
1598 | #define DT_WHT 14 | |
1599 | ||
1da177e4 LT |
1600 | /* |
1601 | * This is the "filldir" function type, used by readdir() to let | |
1602 | * the kernel specify what kind of dirent layout it wants to have. | |
1603 | * This allows the kernel to read directories into kernel space or | |
1604 | * to have different dirent layouts depending on the binary type. | |
1605 | */ | |
ac7576f4 MS |
1606 | struct dir_context; |
1607 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, | |
1608 | unsigned); | |
1609 | ||
5c0ba4e0 | 1610 | struct dir_context { |
ac6614b7 | 1611 | const filldir_t actor; |
bb6f619b | 1612 | loff_t pos; |
5c0ba4e0 | 1613 | }; |
bb6f619b | 1614 | |
08f85851 | 1615 | struct block_device_operations; |
1da177e4 | 1616 | |
1da177e4 LT |
1617 | /* These macros are for out of kernel modules to test that |
1618 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1619 | * fields in struct file_operations. */ | |
1620 | #define HAVE_COMPAT_IOCTL 1 | |
1621 | #define HAVE_UNLOCKED_IOCTL 1 | |
1622 | ||
b4caecd4 CH |
1623 | /* |
1624 | * These flags let !MMU mmap() govern direct device mapping vs immediate | |
1625 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. | |
1626 | * | |
1627 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) | |
1628 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) | |
1629 | * NOMMU_MAP_READ: Can be mapped for reading | |
1630 | * NOMMU_MAP_WRITE: Can be mapped for writing | |
1631 | * NOMMU_MAP_EXEC: Can be mapped for execution | |
1632 | */ | |
1633 | #define NOMMU_MAP_COPY 0x00000001 | |
1634 | #define NOMMU_MAP_DIRECT 0x00000008 | |
1635 | #define NOMMU_MAP_READ VM_MAYREAD | |
1636 | #define NOMMU_MAP_WRITE VM_MAYWRITE | |
1637 | #define NOMMU_MAP_EXEC VM_MAYEXEC | |
1638 | ||
1639 | #define NOMMU_VMFLAGS \ | |
1640 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) | |
1641 | ||
1642 | ||
293bc982 AV |
1643 | struct iov_iter; |
1644 | ||
1da177e4 LT |
1645 | struct file_operations { |
1646 | struct module *owner; | |
1647 | loff_t (*llseek) (struct file *, loff_t, int); | |
1648 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1649 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
293bc982 AV |
1650 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
1651 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); | |
bb6f619b | 1652 | int (*iterate) (struct file *, struct dir_context *); |
61922694 | 1653 | int (*iterate_shared) (struct file *, struct dir_context *); |
1da177e4 | 1654 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
1da177e4 LT |
1655 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1656 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1657 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1658 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1659 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1660 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1661 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1662 | int (*fasync) (int, struct file *, int); |
1663 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1664 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1665 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1666 | int (*check_flags)(int); | |
1da177e4 | 1667 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1668 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1669 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
e6f5c789 | 1670 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
2fe17c10 CH |
1671 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1672 | loff_t len); | |
a3816ab0 | 1673 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
b4caecd4 CH |
1674 | #ifndef CONFIG_MMU |
1675 | unsigned (*mmap_capabilities)(struct file *); | |
1676 | #endif | |
04b38d60 CH |
1677 | ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, |
1678 | loff_t, size_t, unsigned int); | |
1679 | int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t, | |
1680 | u64); | |
54dbc151 DW |
1681 | ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *, |
1682 | u64); | |
1da177e4 LT |
1683 | }; |
1684 | ||
1685 | struct inode_operations { | |
00cd8dd3 | 1686 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
fceef393 | 1687 | const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); |
10556cb2 | 1688 | int (*permission) (struct inode *, int); |
4e34e719 | 1689 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1690 | |
1691 | int (*readlink) (struct dentry *, char __user *,int); | |
44a7d7a8 | 1692 | |
ebfc3b49 | 1693 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1da177e4 LT |
1694 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1695 | int (*unlink) (struct inode *,struct dentry *); | |
1696 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1697 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1698 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1699 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 1700 | int (*rename) (struct inode *, struct dentry *, |
520c8b16 | 1701 | struct inode *, struct dentry *, unsigned int); |
1da177e4 LT |
1702 | int (*setattr) (struct dentry *, struct iattr *); |
1703 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1da177e4 | 1704 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
c4b929b8 MF |
1705 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1706 | u64 len); | |
c3b2da31 | 1707 | int (*update_time)(struct inode *, struct timespec *, int); |
d9585277 | 1708 | int (*atomic_open)(struct inode *, struct dentry *, |
30d90494 | 1709 | struct file *, unsigned open_flag, |
d9585277 | 1710 | umode_t create_mode, int *opened); |
60545d0d | 1711 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
893d46e4 | 1712 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
44a7d7a8 | 1713 | } ____cacheline_aligned; |
1da177e4 | 1714 | |
eed4e51f | 1715 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1716 | unsigned long nr_segs, unsigned long fast_segs, |
1717 | struct iovec *fast_pointer, | |
ac34ebb3 | 1718 | struct iovec **ret_pointer); |
eed4e51f | 1719 | |
6fb5032e | 1720 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); |
493c84c0 | 1721 | extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *); |
1da177e4 LT |
1722 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1723 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1724 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
793b80ef | 1725 | unsigned long, loff_t *, int); |
1da177e4 | 1726 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
793b80ef | 1727 | unsigned long, loff_t *, int); |
29732938 ZB |
1728 | extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, |
1729 | loff_t, size_t, unsigned int); | |
876bec6f DW |
1730 | extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in, |
1731 | struct inode *inode_out, loff_t pos_out, | |
1732 | u64 *len, bool is_dedupe); | |
04b38d60 CH |
1733 | extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in, |
1734 | struct file *file_out, loff_t pos_out, u64 len); | |
876bec6f DW |
1735 | extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, |
1736 | struct inode *dest, loff_t destoff, | |
1737 | loff_t len, bool *is_same); | |
54dbc151 DW |
1738 | extern int vfs_dedupe_file_range(struct file *file, |
1739 | struct file_dedupe_range *same); | |
1da177e4 | 1740 | |
031a072a AG |
1741 | static inline int do_clone_file_range(struct file *file_in, loff_t pos_in, |
1742 | struct file *file_out, loff_t pos_out, | |
1743 | u64 len) | |
1744 | { | |
1745 | int ret; | |
1746 | ||
1747 | sb_start_write(file_inode(file_out)->i_sb); | |
1748 | ret = vfs_clone_file_range(file_in, pos_in, file_out, pos_out, len); | |
1749 | sb_end_write(file_inode(file_out)->i_sb); | |
1750 | ||
1751 | return ret; | |
1752 | } | |
1da177e4 | 1753 | |
1da177e4 LT |
1754 | struct super_operations { |
1755 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1756 | void (*destroy_inode)(struct inode *); | |
1757 | ||
aa385729 | 1758 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1759 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1760 | int (*drop_inode) (struct inode *); |
be7ce416 | 1761 | void (*evict_inode) (struct inode *); |
1da177e4 | 1762 | void (*put_super) (struct super_block *); |
1da177e4 | 1763 | int (*sync_fs)(struct super_block *sb, int wait); |
48b6bca6 | 1764 | int (*freeze_super) (struct super_block *); |
c4be0c1d | 1765 | int (*freeze_fs) (struct super_block *); |
48b6bca6 | 1766 | int (*thaw_super) (struct super_block *); |
c4be0c1d | 1767 | int (*unfreeze_fs) (struct super_block *); |
726c3342 | 1768 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1769 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1770 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1771 | |
34c80b1d | 1772 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1773 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1774 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1775 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1776 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1777 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1778 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
2d0fa467 | 1779 | struct dquot **(*get_dquots)(struct inode *); |
0e51a720 | 1780 | #endif |
87d8fe1e | 1781 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
4101b624 VD |
1782 | long (*nr_cached_objects)(struct super_block *, |
1783 | struct shrink_control *); | |
1784 | long (*free_cached_objects)(struct super_block *, | |
1785 | struct shrink_control *); | |
1da177e4 LT |
1786 | }; |
1787 | ||
bbc1096a DH |
1788 | /* |
1789 | * Inode flags - they have no relation to superblock flags now | |
1790 | */ | |
1791 | #define S_SYNC 1 /* Writes are synced at once */ | |
1792 | #define S_NOATIME 2 /* Do not update access times */ | |
1793 | #define S_APPEND 4 /* Append-only file */ | |
1794 | #define S_IMMUTABLE 8 /* Immutable file */ | |
1795 | #define S_DEAD 16 /* removed, but still open directory */ | |
1796 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
1797 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
1798 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
1799 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
1800 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
1801 | #define S_IMA 1024 /* Inode has an associated IMA struct */ | |
1802 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ | |
1803 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ | |
6cd176a5 | 1804 | #ifdef CONFIG_FS_DAX |
fbbbad4b MW |
1805 | #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
1806 | #else | |
1807 | #define S_DAX 0 /* Make all the DAX code disappear */ | |
1808 | #endif | |
bbc1096a DH |
1809 | |
1810 | /* | |
1811 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
1812 | * flags just means all the inodes inherit those flags by default. It might be | |
1813 | * possible to override it selectively if you really wanted to with some | |
1814 | * ioctl() that is not currently implemented. | |
1815 | * | |
1816 | * Exception: MS_RDONLY is always applied to the entire file system. | |
1817 | * | |
1818 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
1819 | * with files in use. This means that all of the inodes will not have their | |
1820 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
1821 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
1822 | */ | |
1823 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) | |
1824 | ||
1825 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
1826 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
1827 | ((inode)->i_flags & S_SYNC)) | |
1828 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
1829 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
1830 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
1831 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) | |
1832 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) | |
1833 | ||
1834 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
1835 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
1836 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1837 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) | |
1838 | ||
1839 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
1840 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
1841 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
1842 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
1843 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) | |
1844 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) | |
1845 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) | |
fbbbad4b | 1846 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
bbc1096a | 1847 | |
787fb6bc MS |
1848 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
1849 | (inode)->i_rdev == WHITEOUT_DEV) | |
1850 | ||
0bd23d09 EB |
1851 | static inline bool HAS_UNMAPPED_ID(struct inode *inode) |
1852 | { | |
1853 | return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid); | |
1854 | } | |
1855 | ||
1c0eeaf5 | 1856 | /* |
250df6ed | 1857 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
1858 | * |
1859 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1860 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1861 | * | |
1862 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1863 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1864 | * various stages of removing an inode. | |
1865 | * | |
eaff8079 | 1866 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 1867 | * |
e7ca2d41 JE |
1868 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1869 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
1870 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1871 | * these changes separately from I_DIRTY_SYNC so that we | |
1872 | * don't have to write inode on fdatasync() when only | |
1873 | * mtime has changed in it. | |
1c0eeaf5 | 1874 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
1875 | * I_NEW Serves as both a mutex and completion notification. |
1876 | * New inodes set I_NEW. If two processes both create | |
1877 | * the same inode, one of them will release its inode and | |
1878 | * wait for I_NEW to be released before returning. | |
1879 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1880 | * also cause waiting on I_NEW, without I_NEW actually | |
1881 | * being set. find_inode() uses this to prevent returning | |
1882 | * nearly-dead inodes. | |
1c0eeaf5 JE |
1883 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1884 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1885 | * cleared. | |
1886 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1887 | * pages or buffers attached or the inode itself is still | |
1888 | * dirty. | |
dbd5768f JK |
1889 | * I_CLEAR Added by clear_inode(). In this state the inode is |
1890 | * clean and can be destroyed. Inode keeps I_FREEING. | |
1c0eeaf5 JE |
1891 | * |
1892 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1893 | * prohibited for many purposes. iget() must wait for | |
1894 | * the inode to be completely released, then create it | |
1895 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 1896 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 1897 | * |
169ebd90 JK |
1898 | * I_SYNC Writeback of inode is running. The bit is set during |
1899 | * data writeback, and cleared with a wakeup on the bit | |
1900 | * address once it is done. The bit is also used to pin | |
1901 | * the inode in memory for flusher thread. | |
1c0eeaf5 | 1902 | * |
bd5fe6c5 CH |
1903 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1904 | * | |
1905 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
1906 | * | |
682aa8e1 TH |
1907 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
1908 | * synchronize competing switching instances and to tell | |
1909 | * wb stat updates to grab mapping->tree_lock. See | |
1910 | * inode_switch_wb_work_fn() for details. | |
1911 | * | |
1c0eeaf5 | 1912 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 1913 | */ |
9e38d86f NP |
1914 | #define I_DIRTY_SYNC (1 << 0) |
1915 | #define I_DIRTY_DATASYNC (1 << 1) | |
1916 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
1917 | #define __I_NEW 3 |
1918 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
1919 | #define I_WILL_FREE (1 << 4) |
1920 | #define I_FREEING (1 << 5) | |
1921 | #define I_CLEAR (1 << 6) | |
eaff8079 | 1922 | #define __I_SYNC 7 |
1c0eeaf5 | 1923 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 1924 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 | 1925 | #define __I_DIO_WAKEUP 9 |
ac74d8d6 | 1926 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
f4e0c30c | 1927 | #define I_LINKABLE (1 << 10) |
0ae45f63 TT |
1928 | #define I_DIRTY_TIME (1 << 11) |
1929 | #define __I_DIRTY_TIME_EXPIRED 12 | |
1930 | #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) | |
682aa8e1 | 1931 | #define I_WB_SWITCH (1 << 13) |
1da177e4 LT |
1932 | |
1933 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
0ae45f63 | 1934 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
1da177e4 LT |
1935 | |
1936 | extern void __mark_inode_dirty(struct inode *, int); | |
1937 | static inline void mark_inode_dirty(struct inode *inode) | |
1938 | { | |
1939 | __mark_inode_dirty(inode, I_DIRTY); | |
1940 | } | |
1941 | ||
1942 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1943 | { | |
1944 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1945 | } | |
1946 | ||
7ada4db8 MS |
1947 | extern void inc_nlink(struct inode *inode); |
1948 | extern void drop_nlink(struct inode *inode); | |
1949 | extern void clear_nlink(struct inode *inode); | |
1950 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
1951 | |
1952 | static inline void inode_inc_link_count(struct inode *inode) | |
1953 | { | |
1954 | inc_nlink(inode); | |
66d21730 AD |
1955 | mark_inode_dirty(inode); |
1956 | } | |
1957 | ||
9a53c3a7 DH |
1958 | static inline void inode_dec_link_count(struct inode *inode) |
1959 | { | |
1960 | drop_nlink(inode); | |
66d21730 AD |
1961 | mark_inode_dirty(inode); |
1962 | } | |
1963 | ||
25ec56b5 JNC |
1964 | /** |
1965 | * inode_inc_iversion - increments i_version | |
1966 | * @inode: inode that need to be updated | |
1967 | * | |
1968 | * Every time the inode is modified, the i_version field will be incremented. | |
1969 | * The filesystem has to be mounted with i_version flag | |
1970 | */ | |
1971 | ||
1972 | static inline void inode_inc_iversion(struct inode *inode) | |
1973 | { | |
1974 | spin_lock(&inode->i_lock); | |
1975 | inode->i_version++; | |
1976 | spin_unlock(&inode->i_lock); | |
1977 | } | |
1978 | ||
c3b2da31 JB |
1979 | enum file_time_flags { |
1980 | S_ATIME = 1, | |
1981 | S_MTIME = 2, | |
1982 | S_CTIME = 4, | |
1983 | S_VERSION = 8, | |
1984 | }; | |
1985 | ||
badcf2b7 | 1986 | extern void touch_atime(const struct path *); |
1da177e4 LT |
1987 | static inline void file_accessed(struct file *file) |
1988 | { | |
1989 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 1990 | touch_atime(&file->f_path); |
1da177e4 LT |
1991 | } |
1992 | ||
1993 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 1994 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 1995 | |
1da177e4 LT |
1996 | struct file_system_type { |
1997 | const char *name; | |
1998 | int fs_flags; | |
bbc1096a DH |
1999 | #define FS_REQUIRES_DEV 1 |
2000 | #define FS_BINARY_MOUNTDATA 2 | |
2001 | #define FS_HAS_SUBTYPE 4 | |
0c55cfc4 | 2002 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
bbc1096a | 2003 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
c96e41e9 AV |
2004 | struct dentry *(*mount) (struct file_system_type *, int, |
2005 | const char *, void *); | |
1da177e4 LT |
2006 | void (*kill_sb) (struct super_block *); |
2007 | struct module *owner; | |
2008 | struct file_system_type * next; | |
a5166169 | 2009 | struct hlist_head fs_supers; |
d475fd42 | 2010 | |
cf516249 | 2011 | struct lock_class_key s_lock_key; |
897c6ff9 | 2012 | struct lock_class_key s_umount_key; |
51ee049e | 2013 | struct lock_class_key s_vfs_rename_key; |
5accdf82 | 2014 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
d475fd42 PZ |
2015 | |
2016 | struct lock_class_key i_lock_key; | |
2017 | struct lock_class_key i_mutex_key; | |
14358e6d | 2018 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
2019 | }; |
2020 | ||
7f78e035 EB |
2021 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
2022 | ||
d91ee87d EB |
2023 | extern struct dentry *mount_ns(struct file_system_type *fs_type, |
2024 | int flags, void *data, void *ns, struct user_namespace *user_ns, | |
2025 | int (*fill_super)(struct super_block *, void *, int)); | |
152a0836 AV |
2026 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2027 | int flags, const char *dev_name, void *data, | |
2028 | int (*fill_super)(struct super_block *, void *, int)); | |
fc14f2fe AV |
2029 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2030 | int flags, void *data, | |
2031 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
2032 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2033 | int flags, void *data, | |
2034 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 2035 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 LT |
2036 | void generic_shutdown_super(struct super_block *sb); |
2037 | void kill_block_super(struct super_block *sb); | |
2038 | void kill_anon_super(struct super_block *sb); | |
2039 | void kill_litter_super(struct super_block *sb); | |
2040 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 2041 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 2042 | int set_anon_super(struct super_block *s, void *data); |
0ee5dc67 AV |
2043 | int get_anon_bdev(dev_t *); |
2044 | void free_anon_bdev(dev_t); | |
6e4eab57 EB |
2045 | struct super_block *sget_userns(struct file_system_type *type, |
2046 | int (*test)(struct super_block *,void *), | |
2047 | int (*set)(struct super_block *,void *), | |
2048 | int flags, struct user_namespace *user_ns, | |
2049 | void *data); | |
1da177e4 LT |
2050 | struct super_block *sget(struct file_system_type *type, |
2051 | int (*test)(struct super_block *,void *), | |
2052 | int (*set)(struct super_block *,void *), | |
9249e17f | 2053 | int flags, void *data); |
bba0bd31 AG |
2054 | extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *, |
2055 | const struct super_operations *ops, | |
2056 | const struct xattr_handler **xattr, | |
2057 | const struct dentry_operations *dops, | |
2058 | unsigned long); | |
2059 | ||
2060 | static inline struct dentry * | |
2061 | mount_pseudo(struct file_system_type *fs_type, char *name, | |
2062 | const struct super_operations *ops, | |
2063 | const struct dentry_operations *dops, unsigned long magic) | |
2064 | { | |
2065 | return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic); | |
2066 | } | |
1da177e4 LT |
2067 | |
2068 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
2069 | #define fops_get(fops) \ | |
2070 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
2071 | #define fops_put(fops) \ | |
2072 | do { if (fops) module_put((fops)->owner); } while(0) | |
e84f9e57 AV |
2073 | /* |
2074 | * This one is to be used *ONLY* from ->open() instances. | |
2075 | * fops must be non-NULL, pinned down *and* module dependencies | |
2076 | * should be sufficient to pin the caller down as well. | |
2077 | */ | |
2078 | #define replace_fops(f, fops) \ | |
2079 | do { \ | |
2080 | struct file *__file = (f); \ | |
2081 | fops_put(__file->f_op); \ | |
2082 | BUG_ON(!(__file->f_op = (fops))); \ | |
2083 | } while(0) | |
1da177e4 LT |
2084 | |
2085 | extern int register_filesystem(struct file_system_type *); | |
2086 | extern int unregister_filesystem(struct file_system_type *); | |
8bf9725c PE |
2087 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
2088 | #define kern_mount(type) kern_mount_data(type, NULL) | |
423e0ab0 | 2089 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
2090 | extern int may_umount_tree(struct vfsmount *); |
2091 | extern int may_umount(struct vfsmount *); | |
5e6123f3 SL |
2092 | extern long do_mount(const char *, const char __user *, |
2093 | const char *, unsigned long, void *); | |
ca71cf71 | 2094 | extern struct vfsmount *collect_mounts(const struct path *); |
8aec0809 | 2095 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
2096 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
2097 | struct vfsmount *); | |
f0bb5aaf | 2098 | extern int vfs_statfs(const struct path *, struct kstatfs *); |
c8b91acc AV |
2099 | extern int user_statfs(const char __user *, struct kstatfs *); |
2100 | extern int fd_statfs(int, struct kstatfs *); | |
cf31e70d | 2101 | extern int vfs_ustat(dev_t, struct kstatfs *); |
18e9e510 JB |
2102 | extern int freeze_super(struct super_block *super); |
2103 | extern int thaw_super(struct super_block *super); | |
02125a82 | 2104 | extern bool our_mnt(struct vfsmount *mnt); |
1da177e4 | 2105 | |
ce3b0f8d AV |
2106 | extern int current_umask(void); |
2107 | ||
5a14696c BF |
2108 | extern void ihold(struct inode * inode); |
2109 | extern void iput(struct inode *); | |
0ae45f63 | 2110 | extern int generic_update_time(struct inode *, struct timespec *, int); |
5a14696c | 2111 | |
f87fd4c2 | 2112 | /* /sys/fs */ |
00d26666 | 2113 | extern struct kobject *fs_kobj; |
f87fd4c2 | 2114 | |
09cbfeaf | 2115 | #define MAX_RW_COUNT (INT_MAX & PAGE_MASK) |
bfcd17a6 | 2116 | |
9e8925b6 | 2117 | #ifdef CONFIG_MANDATORY_FILE_LOCKING |
d7a06983 | 2118 | extern int locks_mandatory_locked(struct file *); |
acc15575 | 2119 | extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char); |
1da177e4 LT |
2120 | |
2121 | /* | |
2122 | * Candidates for mandatory locking have the setgid bit set | |
2123 | * but no group execute bit - an otherwise meaningless combination. | |
2124 | */ | |
a16877ca PE |
2125 | |
2126 | static inline int __mandatory_lock(struct inode *ino) | |
2127 | { | |
2128 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
2129 | } | |
2130 | ||
2131 | /* | |
2132 | * ... and these candidates should be on MS_MANDLOCK mounted fs, | |
2133 | * otherwise these will be advisory locks | |
2134 | */ | |
2135 | ||
2136 | static inline int mandatory_lock(struct inode *ino) | |
2137 | { | |
2138 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
2139 | } | |
1da177e4 | 2140 | |
d7a06983 | 2141 | static inline int locks_verify_locked(struct file *file) |
1da177e4 | 2142 | { |
c568d683 | 2143 | if (mandatory_lock(locks_inode(file))) |
d7a06983 | 2144 | return locks_mandatory_locked(file); |
1da177e4 LT |
2145 | return 0; |
2146 | } | |
2147 | ||
1da177e4 | 2148 | static inline int locks_verify_truncate(struct inode *inode, |
acc15575 | 2149 | struct file *f, |
1da177e4 LT |
2150 | loff_t size) |
2151 | { | |
acc15575 CH |
2152 | if (!inode->i_flctx || !mandatory_lock(inode)) |
2153 | return 0; | |
2154 | ||
2155 | if (size < inode->i_size) { | |
2156 | return locks_mandatory_area(inode, f, size, inode->i_size - 1, | |
2157 | F_WRLCK); | |
2158 | } else { | |
2159 | return locks_mandatory_area(inode, f, inode->i_size, size - 1, | |
2160 | F_WRLCK); | |
2161 | } | |
1da177e4 LT |
2162 | } |
2163 | ||
9e8925b6 JL |
2164 | #else /* !CONFIG_MANDATORY_FILE_LOCKING */ |
2165 | ||
2166 | static inline int locks_mandatory_locked(struct file *file) | |
2167 | { | |
2168 | return 0; | |
2169 | } | |
2170 | ||
fce205e9 LT |
2171 | static inline int locks_mandatory_area(struct inode *inode, struct file *filp, |
2172 | loff_t start, loff_t end, unsigned char type) | |
9e8925b6 JL |
2173 | { |
2174 | return 0; | |
2175 | } | |
2176 | ||
2177 | static inline int __mandatory_lock(struct inode *inode) | |
2178 | { | |
2179 | return 0; | |
2180 | } | |
2181 | ||
2182 | static inline int mandatory_lock(struct inode *inode) | |
2183 | { | |
2184 | return 0; | |
2185 | } | |
2186 | ||
2187 | static inline int locks_verify_locked(struct file *file) | |
2188 | { | |
2189 | return 0; | |
2190 | } | |
2191 | ||
2192 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
2193 | size_t size) | |
2194 | { | |
2195 | return 0; | |
2196 | } | |
2197 | ||
2198 | #endif /* CONFIG_MANDATORY_FILE_LOCKING */ | |
2199 | ||
2200 | ||
2201 | #ifdef CONFIG_FILE_LOCKING | |
1da177e4 LT |
2202 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2203 | { | |
24cbe784 JL |
2204 | /* |
2205 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2206 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2207 | * could end up racing with tasks trying to set a new lease on this | |
2208 | * file. | |
24cbe784 JL |
2209 | */ |
2210 | smp_mb(); | |
8634b51f | 2211 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2212 | return __break_lease(inode, mode, FL_LEASE); |
1da177e4 LT |
2213 | return 0; |
2214 | } | |
df4e8d2c BF |
2215 | |
2216 | static inline int break_deleg(struct inode *inode, unsigned int mode) | |
2217 | { | |
962bd40b JL |
2218 | /* |
2219 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2220 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2221 | * could end up racing with tasks trying to set a new lease on this | |
2222 | * file. | |
962bd40b JL |
2223 | */ |
2224 | smp_mb(); | |
8634b51f | 2225 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2226 | return __break_lease(inode, mode, FL_DELEG); |
1da177e4 LT |
2227 | return 0; |
2228 | } | |
df4e8d2c | 2229 | |
5a14696c BF |
2230 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2231 | { | |
2232 | int ret; | |
2233 | ||
2234 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); | |
2235 | if (ret == -EWOULDBLOCK && delegated_inode) { | |
2236 | *delegated_inode = inode; | |
2237 | ihold(inode); | |
2238 | } | |
2239 | return ret; | |
2240 | } | |
2241 | ||
2242 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2243 | { | |
2244 | int ret; | |
2245 | ||
2246 | ret = break_deleg(*delegated_inode, O_WRONLY); | |
2247 | iput(*delegated_inode); | |
2248 | *delegated_inode = NULL; | |
2249 | return ret; | |
2250 | } | |
2251 | ||
11afe9f7 CH |
2252 | static inline int break_layout(struct inode *inode, bool wait) |
2253 | { | |
2254 | smp_mb(); | |
2255 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) | |
2256 | return __break_lease(inode, | |
2257 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, | |
2258 | FL_LAYOUT); | |
2259 | return 0; | |
2260 | } | |
2261 | ||
bfcd17a6 | 2262 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
2263 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2264 | { | |
2265 | return 0; | |
2266 | } | |
2267 | ||
df4e8d2c BF |
2268 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2269 | { | |
2270 | return 0; | |
2271 | } | |
5a14696c BF |
2272 | |
2273 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) | |
2274 | { | |
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2279 | { | |
2280 | BUG(); | |
2281 | return 0; | |
2282 | } | |
2283 | ||
11afe9f7 CH |
2284 | static inline int break_layout(struct inode *inode, bool wait) |
2285 | { | |
2286 | return 0; | |
2287 | } | |
2288 | ||
bfcd17a6 | 2289 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2290 | |
2291 | /* fs/open.c */ | |
adb5c247 | 2292 | struct audit_names; |
91a27b2a | 2293 | struct filename { |
adb5c247 JL |
2294 | const char *name; /* pointer to actual string */ |
2295 | const __user char *uptr; /* original userland pointer */ | |
2296 | struct audit_names *aname; | |
55422d0b | 2297 | int refcnt; |
fd2f7cb5 | 2298 | const char iname[]; |
91a27b2a | 2299 | }; |
1da177e4 | 2300 | |
7df818b2 | 2301 | extern long vfs_truncate(const struct path *, loff_t); |
4a30131e N |
2302 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2303 | struct file *filp); | |
72c72bdf | 2304 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
3e63cbb1 | 2305 | loff_t len); |
8e8a1407 | 2306 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd | 2307 | umode_t mode); |
669abf4e | 2308 | extern struct file *file_open_name(struct filename *, int, umode_t); |
a218d0fd | 2309 | extern struct file *filp_open(const char *, int, umode_t); |
73d049a4 | 2310 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
378c6520 | 2311 | const char *, int, umode_t); |
765927b2 | 2312 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
1da177e4 | 2313 | extern int filp_close(struct file *, fl_owner_t id); |
91a27b2a | 2314 | |
51f39a1f | 2315 | extern struct filename *getname_flags(const char __user *, int, int *); |
91a27b2a | 2316 | extern struct filename *getname(const char __user *); |
c4ad8f98 | 2317 | extern struct filename *getname_kernel(const char *); |
55422d0b | 2318 | extern void putname(struct filename *name); |
91a27b2a | 2319 | |
47237687 AV |
2320 | enum { |
2321 | FILE_CREATED = 1, | |
2322 | FILE_OPENED = 2 | |
2323 | }; | |
30d90494 AV |
2324 | extern int finish_open(struct file *file, struct dentry *dentry, |
2325 | int (*open)(struct inode *, struct file *), | |
2326 | int *opened); | |
e45198a6 | 2327 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
1da177e4 | 2328 | |
3e63cbb1 AJ |
2329 | /* fs/ioctl.c */ |
2330 | ||
2331 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2332 | ||
1da177e4 LT |
2333 | /* fs/dcache.c */ |
2334 | extern void __init vfs_caches_init_early(void); | |
4248b0da | 2335 | extern void __init vfs_caches_init(void); |
1da177e4 | 2336 | |
b86c089b CL |
2337 | extern struct kmem_cache *names_cachep; |
2338 | ||
a608ca21 | 2339 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
3446a8aa | 2340 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1da177e4 | 2341 | |
9361401e | 2342 | #ifdef CONFIG_BLOCK |
1da177e4 | 2343 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2344 | extern void unregister_blkdev(unsigned int, const char *); |
1da177e4 | 2345 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2346 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 LT |
2347 | extern void bd_set_size(struct block_device *, loff_t size); |
2348 | extern void bd_forget(struct inode *inode); | |
2349 | extern void bdput(struct block_device *); | |
585d3bc0 | 2350 | extern void invalidate_bdev(struct block_device *); |
5c0d6b60 | 2351 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
585d3bc0 | 2352 | extern int sync_blockdev(struct block_device *bdev); |
ff01bb48 | 2353 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2354 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2355 | extern void emergency_thaw_all(void); |
585d3bc0 NP |
2356 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2357 | extern int fsync_bdev(struct block_device *); | |
a212b105 TH |
2358 | |
2359 | extern struct super_block *blockdev_superblock; | |
2360 | ||
2361 | static inline bool sb_is_blkdev_sb(struct super_block *sb) | |
2362 | { | |
2363 | return sb == blockdev_superblock; | |
2364 | } | |
9361401e DH |
2365 | #else |
2366 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2367 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2368 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2369 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2370 | ||
2371 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2372 | { | |
2373 | return NULL; | |
2374 | } | |
2375 | ||
2376 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2377 | { | |
2378 | return 0; | |
2379 | } | |
5c0d6b60 JK |
2380 | |
2381 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) | |
2382 | { | |
2383 | } | |
a8855990 | 2384 | |
3e004eea | 2385 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a8855990 | 2386 | { |
3e004eea | 2387 | return false; |
a8855990 | 2388 | } |
9361401e | 2389 | #endif |
60b0680f | 2390 | extern int sync_filesystem(struct super_block *); |
9361401e | 2391 | extern const struct file_operations def_blk_fops; |
4b6f5d20 | 2392 | extern const struct file_operations def_chr_fops; |
9361401e | 2393 | #ifdef CONFIG_BLOCK |
1da177e4 | 2394 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2395 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2396 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2397 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2398 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2399 | void *holder); | |
2400 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2401 | void *holder); | |
4385bab1 | 2402 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
be324177 JW |
2403 | extern int __blkdev_reread_part(struct block_device *bdev); |
2404 | extern int blkdev_reread_part(struct block_device *bdev); | |
2405 | ||
641dc636 | 2406 | #ifdef CONFIG_SYSFS |
e09b457b | 2407 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2408 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2409 | struct gendisk *disk); | |
641dc636 | 2410 | #else |
e09b457b TH |
2411 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2412 | struct gendisk *disk) | |
2413 | { | |
2414 | return 0; | |
2415 | } | |
49731baa TH |
2416 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2417 | struct gendisk *disk) | |
2418 | { | |
2419 | } | |
641dc636 | 2420 | #endif |
9361401e | 2421 | #endif |
1da177e4 LT |
2422 | |
2423 | /* fs/char_dev.c */ | |
68eef3b4 | 2424 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
49db08c3 LW |
2425 | /* Marks the bottom of the first segment of free char majors */ |
2426 | #define CHRDEV_MAJOR_DYN_END 234 | |
1da177e4 LT |
2427 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2428 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2429 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2430 | unsigned int count, const char *name, | |
2431 | const struct file_operations *fops); | |
2432 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2433 | unsigned int count, const char *name); | |
1da177e4 | 2434 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2435 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2436 | |
1905b1bf TH |
2437 | static inline int register_chrdev(unsigned int major, const char *name, |
2438 | const struct file_operations *fops) | |
2439 | { | |
2440 | return __register_chrdev(major, 0, 256, name, fops); | |
2441 | } | |
2442 | ||
2443 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2444 | { | |
2445 | __unregister_chrdev(major, 0, 256, name); | |
2446 | } | |
2447 | ||
1da177e4 LT |
2448 | /* fs/block_dev.c */ |
2449 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2450 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2451 | |
2452 | #ifdef CONFIG_BLOCK | |
2453 | #define BLKDEV_MAJOR_HASH_SIZE 255 | |
1da177e4 LT |
2454 | extern const char *__bdevname(dev_t, char *buffer); |
2455 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2456 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2457 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2458 | |
9361401e DH |
2459 | #else |
2460 | #define BLKDEV_MAJOR_HASH_SIZE 0 | |
2461 | #endif | |
1da177e4 LT |
2462 | |
2463 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2464 | ||
2465 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2466 | extern void make_bad_inode(struct inode *); | |
0e3ef1fe | 2467 | extern bool is_bad_inode(struct inode *); |
1da177e4 | 2468 | |
c11f0c0b | 2469 | #ifdef CONFIG_BLOCK |
c3279d14 AP |
2470 | extern void check_disk_size_change(struct gendisk *disk, |
2471 | struct block_device *bdev); | |
0c002c2f | 2472 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2473 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2474 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2475 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2476 | #endif |
1da177e4 LT |
2477 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2478 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2479 | |
1da177e4 LT |
2480 | static inline void invalidate_remote_inode(struct inode *inode) |
2481 | { | |
2482 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2483 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2484 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2485 | } |
2486 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2487 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2488 | pgoff_t start, pgoff_t end); | |
2489 | extern int write_inode_now(struct inode *, int); | |
2490 | extern int filemap_fdatawrite(struct address_space *); | |
2491 | extern int filemap_flush(struct address_space *); | |
2492 | extern int filemap_fdatawait(struct address_space *); | |
aa750fd7 | 2493 | extern void filemap_fdatawait_keep_errors(struct address_space *); |
d3bccb6f JK |
2494 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2495 | loff_t lend); | |
1da177e4 LT |
2496 | extern int filemap_write_and_wait(struct address_space *mapping); |
2497 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2498 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2499 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2500 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2501 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2502 | loff_t start, loff_t end); | |
d72d9e2a | 2503 | extern int filemap_check_errors(struct address_space *mapping); |
ebcf28e1 | 2504 | |
8018ab05 CH |
2505 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2506 | int datasync); | |
2507 | extern int vfs_fsync(struct file *file, int datasync); | |
e2592217 CH |
2508 | |
2509 | /* | |
2510 | * Sync the bytes written if this was a synchronous write. Expect ki_pos | |
2511 | * to already be updated for the write, and will return either the amount | |
2512 | * of bytes passed in, or an error if syncing the file failed. | |
2513 | */ | |
2514 | static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) | |
2515 | { | |
2516 | if (iocb->ki_flags & IOCB_DSYNC) { | |
2517 | int ret = vfs_fsync_range(iocb->ki_filp, | |
2518 | iocb->ki_pos - count, iocb->ki_pos - 1, | |
2519 | (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); | |
2520 | if (ret) | |
2521 | return ret; | |
2522 | } | |
2523 | ||
2524 | return count; | |
d311d79d | 2525 | } |
e2592217 | 2526 | |
1da177e4 LT |
2527 | extern void emergency_sync(void); |
2528 | extern void emergency_remount(void); | |
9361401e | 2529 | #ifdef CONFIG_BLOCK |
1da177e4 | 2530 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2531 | #endif |
27ac0ffe | 2532 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
f419a2e3 | 2533 | extern int inode_permission(struct inode *, int); |
bd5d0856 | 2534 | extern int __inode_permission(struct inode *, int); |
2830ba7f | 2535 | extern int generic_permission(struct inode *, int); |
cbdf35bc | 2536 | extern int __check_sticky(struct inode *dir, struct inode *inode); |
1da177e4 | 2537 | |
f696a365 MS |
2538 | static inline bool execute_ok(struct inode *inode) |
2539 | { | |
2540 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2541 | } | |
2542 | ||
8d71db4f AV |
2543 | static inline void file_start_write(struct file *file) |
2544 | { | |
2545 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2546 | return; | |
2547 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); | |
2548 | } | |
2549 | ||
5ae98f15 JK |
2550 | static inline bool file_start_write_trylock(struct file *file) |
2551 | { | |
2552 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2553 | return true; | |
2554 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); | |
2555 | } | |
2556 | ||
8d71db4f AV |
2557 | static inline void file_end_write(struct file *file) |
2558 | { | |
2559 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2560 | return; | |
2561 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); | |
2562 | } | |
2563 | ||
07b8ce1e AV |
2564 | /* |
2565 | * get_write_access() gets write permission for a file. | |
2566 | * put_write_access() releases this write permission. | |
2567 | * This is used for regular files. | |
2568 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2569 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2570 | * can have the following values: | |
2571 | * 0: no writers, no VM_DENYWRITE mappings | |
2572 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2573 | * > 0: (i_writecount) users are writing to the file. | |
2574 | * | |
2575 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2576 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2577 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2578 | * to do the change if sign is wrong. | |
2579 | */ | |
2580 | static inline int get_write_access(struct inode *inode) | |
2581 | { | |
2582 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2583 | } | |
2584 | static inline int deny_write_access(struct file *file) | |
2585 | { | |
496ad9aa | 2586 | struct inode *inode = file_inode(file); |
07b8ce1e AV |
2587 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2588 | } | |
1da177e4 LT |
2589 | static inline void put_write_access(struct inode * inode) |
2590 | { | |
2591 | atomic_dec(&inode->i_writecount); | |
2592 | } | |
2593 | static inline void allow_write_access(struct file *file) | |
2594 | { | |
2595 | if (file) | |
496ad9aa | 2596 | atomic_inc(&file_inode(file)->i_writecount); |
1da177e4 | 2597 | } |
f1fe29b4 DH |
2598 | static inline bool inode_is_open_for_write(const struct inode *inode) |
2599 | { | |
2600 | return atomic_read(&inode->i_writecount) > 0; | |
2601 | } | |
2602 | ||
a5c96ebf MZ |
2603 | #ifdef CONFIG_IMA |
2604 | static inline void i_readcount_dec(struct inode *inode) | |
2605 | { | |
2606 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2607 | atomic_dec(&inode->i_readcount); | |
2608 | } | |
2609 | static inline void i_readcount_inc(struct inode *inode) | |
2610 | { | |
2611 | atomic_inc(&inode->i_readcount); | |
2612 | } | |
2613 | #else | |
2614 | static inline void i_readcount_dec(struct inode *inode) | |
2615 | { | |
2616 | return; | |
2617 | } | |
2618 | static inline void i_readcount_inc(struct inode *inode) | |
2619 | { | |
2620 | return; | |
2621 | } | |
2622 | #endif | |
ed8cae8b | 2623 | extern int do_pipe_flags(int *, int); |
1da177e4 | 2624 | |
1284ab5b MZ |
2625 | #define __kernel_read_file_id(id) \ |
2626 | id(UNKNOWN, unknown) \ | |
2627 | id(FIRMWARE, firmware) \ | |
a098ecd2 | 2628 | id(FIRMWARE_PREALLOC_BUFFER, firmware) \ |
1284ab5b MZ |
2629 | id(MODULE, kernel-module) \ |
2630 | id(KEXEC_IMAGE, kexec-image) \ | |
2631 | id(KEXEC_INITRAMFS, kexec-initramfs) \ | |
2632 | id(POLICY, security-policy) \ | |
2633 | id(MAX_ID, ) | |
2634 | ||
2635 | #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, | |
2636 | #define __fid_stringify(dummy, str) #str, | |
2637 | ||
bc8ca5b9 | 2638 | enum kernel_read_file_id { |
1284ab5b MZ |
2639 | __kernel_read_file_id(__fid_enumify) |
2640 | }; | |
2641 | ||
2642 | static const char * const kernel_read_file_str[] = { | |
2643 | __kernel_read_file_id(__fid_stringify) | |
bc8ca5b9 MZ |
2644 | }; |
2645 | ||
da20dfe6 | 2646 | static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) |
1284ab5b MZ |
2647 | { |
2648 | if (id < 0 || id >= READING_MAX_ID) | |
2649 | return kernel_read_file_str[READING_UNKNOWN]; | |
2650 | ||
2651 | return kernel_read_file_str[id]; | |
2652 | } | |
2653 | ||
6777d773 | 2654 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
bc8ca5b9 MZ |
2655 | extern int kernel_read_file(struct file *, void **, loff_t *, loff_t, |
2656 | enum kernel_read_file_id); | |
09596b94 MZ |
2657 | extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t, |
2658 | enum kernel_read_file_id); | |
b844f0ec MZ |
2659 | extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t, |
2660 | enum kernel_read_file_id); | |
7bb307e8 | 2661 | extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); |
ed44724b | 2662 | extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *); |
1da177e4 LT |
2663 | extern struct file * open_exec(const char *); |
2664 | ||
2665 | /* fs/dcache.c -- generic fs support functions */ | |
a6e5787f | 2666 | extern bool is_subdir(struct dentry *, struct dentry *); |
640eb7e7 | 2667 | extern bool path_is_under(const struct path *, const struct path *); |
1da177e4 | 2668 | |
9bf39ab2 MS |
2669 | extern char *file_path(struct file *, char *, int); |
2670 | ||
1da177e4 LT |
2671 | #include <linux/err.h> |
2672 | ||
2673 | /* needed for stackable file system support */ | |
965c8e59 | 2674 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2675 | |
965c8e59 | 2676 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2677 | |
54e34621 | 2678 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2679 | extern void inode_init_once(struct inode *); |
2aa15890 | 2680 | extern void address_space_init_once(struct address_space *mapping); |
1da177e4 LT |
2681 | extern struct inode * igrab(struct inode *); |
2682 | extern ino_t iunique(struct super_block *, ino_t); | |
2683 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2684 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2685 | static inline int generic_drop_inode(struct inode *inode) |
2686 | { | |
2687 | return !inode->i_nlink || inode_unhashed(inode); | |
2688 | } | |
1da177e4 | 2689 | |
88bd5121 AA |
2690 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2691 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2692 | void *data); | |
1da177e4 LT |
2693 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2694 | int (*test)(struct inode *, void *), void *data); | |
2695 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2696 | ||
2697 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
2698 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
fe032c42 TT |
2699 | extern struct inode *find_inode_nowait(struct super_block *, |
2700 | unsigned long, | |
2701 | int (*match)(struct inode *, | |
2702 | unsigned long, void *), | |
2703 | void *data); | |
261bca86 AV |
2704 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2705 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
2706 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2707 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
2708 | #else | |
2709 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
2710 | #endif | |
1da177e4 | 2711 | extern void unlock_new_inode(struct inode *); |
85fe4025 | 2712 | extern unsigned int get_next_ino(void); |
1da177e4 | 2713 | |
1da177e4 | 2714 | extern void __iget(struct inode * inode); |
b46980fe | 2715 | extern void iget_failed(struct inode *); |
dbd5768f | 2716 | extern void clear_inode(struct inode *); |
2e00c97e | 2717 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
2718 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2719 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 2720 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 2721 | extern int should_remove_suid(struct dentry *); |
5fa8e0a1 | 2722 | extern int file_remove_privs(struct file *); |
1da177e4 LT |
2723 | |
2724 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
2725 | static inline void insert_inode_hash(struct inode *inode) |
2726 | { | |
1da177e4 LT |
2727 | __insert_inode_hash(inode, inode->i_ino); |
2728 | } | |
f2ee7abf ED |
2729 | |
2730 | extern void __remove_inode_hash(struct inode *); | |
2731 | static inline void remove_inode_hash(struct inode *inode) | |
2732 | { | |
cbedaac6 | 2733 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
f2ee7abf ED |
2734 | __remove_inode_hash(inode); |
2735 | } | |
2736 | ||
646ec461 | 2737 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 2738 | |
9361401e | 2739 | #ifdef CONFIG_BLOCK |
1da177e4 | 2740 | extern int bdev_read_only(struct block_device *); |
9361401e | 2741 | #endif |
1da177e4 LT |
2742 | extern int set_blocksize(struct block_device *, int); |
2743 | extern int sb_set_blocksize(struct super_block *, int); | |
2744 | extern int sb_min_blocksize(struct super_block *, int); | |
2745 | ||
2746 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
2747 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
3309dd04 | 2748 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
ed978a81 | 2749 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2750 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2751 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
1af5bb49 | 2752 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *); |
3b93f911 | 2753 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
88e6faef | 2754 | |
dbe4e192 CH |
2755 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos); |
2756 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos); | |
2757 | ||
eef99380 | 2758 | /* fs/block_dev.c */ |
b2de525f | 2759 | extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
1456c0a8 | 2760 | extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
02c24a82 JB |
2761 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2762 | int datasync); | |
ff01bb48 | 2763 | extern void block_sync_page(struct page *page); |
eef99380 | 2764 | |
88e6faef | 2765 | /* fs/splice.c */ |
cbb7e577 | 2766 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 2767 | struct pipe_inode_info *, size_t, unsigned int); |
8d020765 | 2768 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 2769 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 2770 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 | 2771 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1c118596 MS |
2772 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
2773 | loff_t *opos, size_t len, unsigned int flags); | |
2774 | ||
88e6faef | 2775 | |
1da177e4 LT |
2776 | extern void |
2777 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
965c8e59 AM |
2778 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
2779 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); | |
46a1c2c7 | 2780 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
965c8e59 | 2781 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
5760495a | 2782 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
965c8e59 | 2783 | int whence, loff_t maxsize, loff_t eof); |
1bf9d14d AV |
2784 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
2785 | int whence, loff_t size); | |
b25472f9 AV |
2786 | extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t); |
2787 | extern loff_t no_seek_end_llseek(struct file *, loff_t, int); | |
1da177e4 LT |
2788 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2789 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
2790 | ||
9361401e | 2791 | #ifdef CONFIG_BLOCK |
8a4c1e42 | 2792 | typedef void (dio_submit_t)(struct bio *bio, struct inode *inode, |
facd07b0 | 2793 | loff_t file_offset); |
1da177e4 LT |
2794 | |
2795 | enum { | |
1e431f5c CH |
2796 | /* need locking between buffered and direct access */ |
2797 | DIO_LOCKING = 0x01, | |
2798 | ||
2799 | /* filesystem does not support filling holes */ | |
2800 | DIO_SKIP_HOLES = 0x02, | |
60392573 CH |
2801 | |
2802 | /* filesystem can handle aio writes beyond i_size */ | |
2803 | DIO_ASYNC_EXTEND = 0x04, | |
fe0f07d0 JA |
2804 | |
2805 | /* inode/fs/bdev does not need truncate protection */ | |
2806 | DIO_SKIP_DIO_COUNT = 0x08, | |
1da177e4 LT |
2807 | }; |
2808 | ||
eafdc7d1 CH |
2809 | void dio_end_io(struct bio *bio, int error); |
2810 | ||
17f8c842 OS |
2811 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
2812 | struct block_device *bdev, struct iov_iter *iter, | |
c8b8e32d | 2813 | get_block_t get_block, |
17f8c842 OS |
2814 | dio_iodone_t end_io, dio_submit_t submit_io, |
2815 | int flags); | |
7bb46a67 | 2816 | |
17f8c842 OS |
2817 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
2818 | struct inode *inode, | |
c8b8e32d | 2819 | struct iov_iter *iter, |
17f8c842 | 2820 | get_block_t get_block) |
1da177e4 | 2821 | { |
17f8c842 | 2822 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 2823 | get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 2824 | } |
9361401e | 2825 | #endif |
1da177e4 | 2826 | |
1d59d61f | 2827 | void inode_dio_wait(struct inode *inode); |
fe0f07d0 JA |
2828 | |
2829 | /* | |
2830 | * inode_dio_begin - signal start of a direct I/O requests | |
2831 | * @inode: inode the direct I/O happens on | |
2832 | * | |
2833 | * This is called once we've finished processing a direct I/O request, | |
2834 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
2835 | */ | |
2836 | static inline void inode_dio_begin(struct inode *inode) | |
2837 | { | |
2838 | atomic_inc(&inode->i_dio_count); | |
2839 | } | |
2840 | ||
2841 | /* | |
2842 | * inode_dio_end - signal finish of a direct I/O requests | |
2843 | * @inode: inode the direct I/O happens on | |
2844 | * | |
2845 | * This is called once we've finished processing a direct I/O request, | |
2846 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
2847 | */ | |
2848 | static inline void inode_dio_end(struct inode *inode) | |
2849 | { | |
2850 | if (atomic_dec_and_test(&inode->i_dio_count)) | |
2851 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); | |
2852 | } | |
1d59d61f | 2853 | |
5f16f322 TT |
2854 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
2855 | unsigned int mask); | |
2856 | ||
4b6f5d20 | 2857 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
2858 | |
2859 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
2860 | ||
5d826c84 | 2861 | extern int readlink_copy(char __user *, int, const char *); |
1da177e4 | 2862 | extern int page_readlink(struct dentry *, char __user *, int); |
fceef393 AV |
2863 | extern const char *page_get_link(struct dentry *, struct inode *, |
2864 | struct delayed_call *); | |
2865 | extern void page_put_link(void *); | |
0adb25d2 | 2866 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 2867 | int nofs); |
1da177e4 | 2868 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 2869 | extern const struct inode_operations page_symlink_inode_operations; |
fceef393 | 2870 | extern void kfree_link(void *); |
1da177e4 | 2871 | extern void generic_fillattr(struct inode *, struct kstat *); |
b7a6ec52 | 2872 | int vfs_getattr_nosec(struct path *path, struct kstat *stat); |
3dadecce | 2873 | extern int vfs_getattr(struct path *, struct kstat *); |
b462707e | 2874 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 2875 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
1c8924eb | 2876 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
1da177e4 LT |
2877 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
2878 | loff_t inode_get_bytes(struct inode *inode); | |
2879 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
fceef393 AV |
2880 | const char *simple_get_link(struct dentry *, struct inode *, |
2881 | struct delayed_call *); | |
61ba64fc | 2882 | extern const struct inode_operations simple_symlink_inode_operations; |
1da177e4 | 2883 | |
5c0ba4e0 | 2884 | extern int iterate_dir(struct file *, struct dir_context *); |
1da177e4 | 2885 | |
c7887325 DH |
2886 | extern int vfs_stat(const char __user *, struct kstat *); |
2887 | extern int vfs_lstat(const char __user *, struct kstat *); | |
1da177e4 | 2888 | extern int vfs_fstat(unsigned int, struct kstat *); |
c7887325 | 2889 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
d60874cd | 2890 | extern const char *vfs_get_link(struct dentry *, struct delayed_call *); |
fd4a0edf | 2891 | extern int vfs_readlink(struct dentry *, char __user *, int); |
1da177e4 | 2892 | |
e9079cce | 2893 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
2894 | struct fiemap_extent_info *fieinfo, |
2895 | loff_t start, loff_t len, | |
2896 | get_block_t *get_block); | |
68c9d702 JB |
2897 | extern int generic_block_fiemap(struct inode *inode, |
2898 | struct fiemap_extent_info *fieinfo, u64 start, | |
2899 | u64 len, get_block_t *get_block); | |
1da177e4 | 2900 | |
c18479fe MS |
2901 | extern void get_filesystem(struct file_system_type *fs); |
2902 | extern void put_filesystem(struct file_system_type *fs); | |
1da177e4 LT |
2903 | extern struct file_system_type *get_fs_type(const char *name); |
2904 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 2905 | extern struct super_block *get_super_thawed(struct block_device *); |
ba6379f7 | 2906 | extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev); |
4504230a | 2907 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 2908 | extern void drop_super(struct super_block *sb); |
ba6379f7 | 2909 | extern void drop_super_exclusive(struct super_block *sb); |
01a05b33 | 2910 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
2911 | extern void iterate_supers_type(struct file_system_type *, |
2912 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
2913 | |
2914 | extern int dcache_dir_open(struct inode *, struct file *); | |
2915 | extern int dcache_dir_close(struct inode *, struct file *); | |
2916 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
5f99f4e7 | 2917 | extern int dcache_readdir(struct file *, struct dir_context *); |
7bb46a67 | 2918 | extern int simple_setattr(struct dentry *, struct iattr *); |
1da177e4 | 2919 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
726c3342 | 2920 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
20955e89 | 2921 | extern int simple_open(struct inode *inode, struct file *file); |
1da177e4 LT |
2922 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
2923 | extern int simple_unlink(struct inode *, struct dentry *); | |
2924 | extern int simple_rmdir(struct inode *, struct dentry *); | |
e0e0be8a MS |
2925 | extern int simple_rename(struct inode *, struct dentry *, |
2926 | struct inode *, struct dentry *, unsigned int); | |
02c24a82 | 2927 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
2928 | extern int simple_empty(struct dentry *); |
2929 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
2930 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
2931 | loff_t pos, unsigned len, unsigned flags, | |
2932 | struct page **pagep, void **fsdata); | |
2933 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
2934 | loff_t pos, unsigned len, unsigned copied, | |
2935 | struct page *page, void *fsdata); | |
b26d4cd3 | 2936 | extern int always_delete_dentry(const struct dentry *); |
6987843f | 2937 | extern struct inode *alloc_anon_inode(struct super_block *); |
e6f5c789 | 2938 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
b26d4cd3 | 2939 | extern const struct dentry_operations simple_dentry_operations; |
1da177e4 | 2940 | |
00cd8dd3 | 2941 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
1da177e4 | 2942 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
4b6f5d20 | 2943 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 2944 | extern const struct inode_operations simple_dir_inode_operations; |
fbabfd0f EB |
2945 | extern void make_empty_dir_inode(struct inode *inode); |
2946 | extern bool is_empty_dir_inode(struct inode *inode); | |
4b6f5d20 | 2947 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 2948 | struct dentry *d_alloc_name(struct dentry *, const char *); |
7d683a09 | 2949 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
1f5ce9e9 | 2950 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
2951 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
2952 | ||
93b07113 AM |
2953 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
2954 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
2955 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
2956 | const void __user *from, size_t count); | |
1da177e4 | 2957 | |
ac13a829 | 2958 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
02c24a82 | 2959 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 2960 | |
30ca22c7 PL |
2961 | extern int generic_check_addressable(unsigned, u64); |
2962 | ||
e965f963 | 2963 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 2964 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
2965 | struct page *, struct page *, |
2966 | enum migrate_mode); | |
e965f963 CL |
2967 | #else |
2968 | #define buffer_migrate_page NULL | |
2969 | #endif | |
2970 | ||
31051c85 | 2971 | extern int setattr_prepare(struct dentry *, struct iattr *); |
25d9e2d1 | 2972 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
6a1a90ad | 2973 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 2974 | |
c3b2da31 | 2975 | extern int file_update_time(struct file *file); |
1da177e4 | 2976 | |
34c80b1d | 2977 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
b3b304a2 | 2978 | extern void save_mount_options(struct super_block *sb, char *options); |
2a32cebd | 2979 | extern void replace_mount_options(struct super_block *sb, char *options); |
b3b304a2 | 2980 | |
d475c634 MW |
2981 | static inline bool io_is_direct(struct file *filp) |
2982 | { | |
65f87ee7 | 2983 | return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host); |
d475c634 MW |
2984 | } |
2985 | ||
2ba48ce5 AV |
2986 | static inline int iocb_flags(struct file *file) |
2987 | { | |
2988 | int res = 0; | |
2989 | if (file->f_flags & O_APPEND) | |
2990 | res |= IOCB_APPEND; | |
2991 | if (io_is_direct(file)) | |
2992 | res |= IOCB_DIRECT; | |
dde0c2e7 CH |
2993 | if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) |
2994 | res |= IOCB_DSYNC; | |
2995 | if (file->f_flags & __O_SYNC) | |
2996 | res |= IOCB_SYNC; | |
2ba48ce5 AV |
2997 | return res; |
2998 | } | |
2999 | ||
1da177e4 LT |
3000 | static inline ino_t parent_ino(struct dentry *dentry) |
3001 | { | |
3002 | ino_t res; | |
3003 | ||
b5c84bf6 NP |
3004 | /* |
3005 | * Don't strictly need d_lock here? If the parent ino could change | |
3006 | * then surely we'd have a deeper race in the caller? | |
3007 | */ | |
1da177e4 LT |
3008 | spin_lock(&dentry->d_lock); |
3009 | res = dentry->d_parent->d_inode->i_ino; | |
3010 | spin_unlock(&dentry->d_lock); | |
3011 | return res; | |
3012 | } | |
3013 | ||
1da177e4 LT |
3014 | /* Transaction based IO helpers */ |
3015 | ||
3016 | /* | |
3017 | * An argresp is stored in an allocated page and holds the | |
3018 | * size of the argument or response, along with its content | |
3019 | */ | |
3020 | struct simple_transaction_argresp { | |
3021 | ssize_t size; | |
3022 | char data[0]; | |
3023 | }; | |
3024 | ||
3025 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
3026 | ||
3027 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
3028 | size_t size); | |
3029 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
3030 | size_t size, loff_t *pos); | |
3031 | int simple_transaction_release(struct inode *inode, struct file *file); | |
3032 | ||
76791ab2 | 3033 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 3034 | |
acaefc25 AB |
3035 | /* |
3036 | * simple attribute files | |
3037 | * | |
3038 | * These attributes behave similar to those in sysfs: | |
3039 | * | |
3040 | * Writing to an attribute immediately sets a value, an open file can be | |
3041 | * written to multiple times. | |
3042 | * | |
3043 | * Reading from an attribute creates a buffer from the value that might get | |
3044 | * read with multiple read calls. When the attribute has been read | |
3045 | * completely, no further read calls are possible until the file is opened | |
3046 | * again. | |
3047 | * | |
3048 | * All attributes contain a text representation of a numeric value | |
3049 | * that are accessed with the get() and set() functions. | |
3050 | */ | |
3051 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
3052 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
3053 | { \ | |
3054 | __simple_attr_check_format(__fmt, 0ull); \ | |
3055 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
3056 | } \ | |
828c0950 | 3057 | static const struct file_operations __fops = { \ |
acaefc25 AB |
3058 | .owner = THIS_MODULE, \ |
3059 | .open = __fops ## _open, \ | |
74bedc4d | 3060 | .release = simple_attr_release, \ |
acaefc25 AB |
3061 | .read = simple_attr_read, \ |
3062 | .write = simple_attr_write, \ | |
1ec5584e | 3063 | .llseek = generic_file_llseek, \ |
68be3029 | 3064 | } |
acaefc25 | 3065 | |
b9075fa9 JP |
3066 | static inline __printf(1, 2) |
3067 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
3068 | { |
3069 | /* don't do anything, just let the compiler check the arguments; */ | |
3070 | } | |
3071 | ||
3072 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 3073 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 3074 | const char *fmt); |
74bedc4d | 3075 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
3076 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
3077 | size_t len, loff_t *ppos); | |
3078 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
3079 | size_t len, loff_t *ppos); | |
3080 | ||
4be28540 | 3081 | struct ctl_table; |
8d65af78 | 3082 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 3083 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
3084 | int proc_nr_dentry(struct ctl_table *table, int write, |
3085 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
3086 | int proc_nr_inodes(struct ctl_table *table, int write, |
3087 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 3088 | int __init get_filesystem_list(char *buf); |
62239ac2 | 3089 | |
3cd90ea4 | 3090 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
3091 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
3092 | ||
6d125529 | 3093 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 3094 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 3095 | (flag & __FMODE_NONOTIFY))) |
5300990c | 3096 | |
d37177ba | 3097 | static inline bool is_sxid(umode_t mode) |
69b45732 AK |
3098 | { |
3099 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
3100 | } | |
3101 | ||
cbdf35bc MS |
3102 | static inline int check_sticky(struct inode *dir, struct inode *inode) |
3103 | { | |
3104 | if (!(dir->i_mode & S_ISVTX)) | |
3105 | return 0; | |
3106 | ||
3107 | return __check_sticky(dir, inode); | |
3108 | } | |
3109 | ||
69b45732 AK |
3110 | static inline void inode_has_no_xattr(struct inode *inode) |
3111 | { | |
9e1f1de0 | 3112 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
69b45732 AK |
3113 | inode->i_flags |= S_NOSEC; |
3114 | } | |
3115 | ||
a7400222 AV |
3116 | static inline bool is_root_inode(struct inode *inode) |
3117 | { | |
3118 | return inode == inode->i_sb->s_root->d_inode; | |
3119 | } | |
3120 | ||
5f99f4e7 AV |
3121 | static inline bool dir_emit(struct dir_context *ctx, |
3122 | const char *name, int namelen, | |
3123 | u64 ino, unsigned type) | |
3124 | { | |
3125 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; | |
3126 | } | |
3127 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) | |
3128 | { | |
3129 | return ctx->actor(ctx, ".", 1, ctx->pos, | |
3130 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; | |
3131 | } | |
3132 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) | |
3133 | { | |
3134 | return ctx->actor(ctx, "..", 2, ctx->pos, | |
3135 | parent_ino(file->f_path.dentry), DT_DIR) == 0; | |
3136 | } | |
3137 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) | |
3138 | { | |
3139 | if (ctx->pos == 0) { | |
3140 | if (!dir_emit_dot(file, ctx)) | |
3141 | return false; | |
3142 | ctx->pos = 1; | |
3143 | } | |
3144 | if (ctx->pos == 1) { | |
3145 | if (!dir_emit_dotdot(file, ctx)) | |
3146 | return false; | |
3147 | ctx->pos = 2; | |
3148 | } | |
3149 | return true; | |
3150 | } | |
5ded75ec AV |
3151 | static inline bool dir_relax(struct inode *inode) |
3152 | { | |
5955102c AV |
3153 | inode_unlock(inode); |
3154 | inode_lock(inode); | |
5ded75ec AV |
3155 | return !IS_DEADDIR(inode); |
3156 | } | |
5f99f4e7 | 3157 | |
ae05327a AV |
3158 | static inline bool dir_relax_shared(struct inode *inode) |
3159 | { | |
3160 | inode_unlock_shared(inode); | |
3161 | inode_lock_shared(inode); | |
3162 | return !IS_DEADDIR(inode); | |
3163 | } | |
3164 | ||
90f8572b | 3165 | extern bool path_noexec(const struct path *path); |
21fc61c7 | 3166 | extern void inode_nohighmem(struct inode *inode); |
90f8572b | 3167 | |
1da177e4 | 3168 | #endif /* _LINUX_FS_H */ |