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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> |
08cce05c | 31 | #include <linux/blk_types.h> |
853b39a7 | 32 | #include <linux/workqueue.h> |
8129ed29 | 33 | #include <linux/percpu-rwsem.h> |
fceef393 | 34 | #include <linux/delayed_call.h> |
1da177e4 | 35 | |
1da177e4 | 36 | #include <asm/byteorder.h> |
607ca46e | 37 | #include <uapi/linux/fs.h> |
1da177e4 | 38 | |
b83ae6d4 | 39 | struct backing_dev_info; |
52ebea74 | 40 | struct bdi_writeback; |
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 | ||
08cce05c | 154 | /* |
4e1b2d52 | 155 | * The below are the various read and write flags that we support. Some of |
08cce05c | 156 | * them include behavioral modifiers that send information down to the |
4e1b2d52 MC |
157 | * block layer and IO scheduler. They should be used along with a req_op. |
158 | * Terminology: | |
08cce05c DH |
159 | * |
160 | * The block layer uses device plugging to defer IO a little bit, in | |
161 | * the hope that we will see more IO very shortly. This increases | |
162 | * coalescing of adjacent IO and thus reduces the number of IOs we | |
163 | * have to send to the device. It also allows for better queuing, | |
164 | * if the IO isn't mergeable. If the caller is going to be waiting | |
165 | * for the IO, then he must ensure that the device is unplugged so | |
166 | * that the IO is dispatched to the driver. | |
167 | * | |
168 | * All IO is handled async in Linux. This is fine for background | |
169 | * writes, but for reads or writes that someone waits for completion | |
170 | * on, we want to notify the block layer and IO scheduler so that they | |
171 | * know about it. That allows them to make better scheduling | |
172 | * decisions. So when the below references 'sync' and 'async', it | |
173 | * is referencing this priority hint. | |
174 | * | |
175 | * With that in mind, the available types are: | |
176 | * | |
177 | * READ A normal read operation. Device will be plugged. | |
178 | * READ_SYNC A synchronous read. Device is not plugged, caller can | |
179 | * immediately wait on this read without caring about | |
180 | * unplugging. | |
08cce05c DH |
181 | * WRITE A normal async write. Device will be plugged. |
182 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down | |
183 | * the hint that someone will be waiting on this IO | |
184 | * shortly. The write equivalent of READ_SYNC. | |
185 | * WRITE_ODIRECT Special case write for O_DIRECT only. | |
186 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. | |
187 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on | |
188 | * non-volatile media on completion. | |
189 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded | |
190 | * by a cache flush and data is guaranteed to be on | |
191 | * non-volatile media on completion. | |
192 | * | |
193 | */ | |
4e1b2d52 | 194 | #define RW_MASK REQ_OP_WRITE |
08cce05c | 195 | |
4e1b2d52 | 196 | #define READ REQ_OP_READ |
70246286 | 197 | #define WRITE REQ_OP_WRITE |
08cce05c | 198 | |
4e1b2d52 MC |
199 | #define READ_SYNC REQ_SYNC |
200 | #define WRITE_SYNC (REQ_SYNC | REQ_NOIDLE) | |
201 | #define WRITE_ODIRECT REQ_SYNC | |
28a8f0d3 | 202 | #define WRITE_FLUSH (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH) |
4e1b2d52 | 203 | #define WRITE_FUA (REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
28a8f0d3 | 204 | #define WRITE_FLUSH_FUA (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH | REQ_FUA) |
08cce05c | 205 | |
1da177e4 LT |
206 | /* |
207 | * Attribute flags. These should be or-ed together to figure out what | |
208 | * has been changed! | |
209 | */ | |
9767d749 MS |
210 | #define ATTR_MODE (1 << 0) |
211 | #define ATTR_UID (1 << 1) | |
212 | #define ATTR_GID (1 << 2) | |
213 | #define ATTR_SIZE (1 << 3) | |
214 | #define ATTR_ATIME (1 << 4) | |
215 | #define ATTR_MTIME (1 << 5) | |
216 | #define ATTR_CTIME (1 << 6) | |
217 | #define ATTR_ATIME_SET (1 << 7) | |
218 | #define ATTR_MTIME_SET (1 << 8) | |
219 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
220 | #define ATTR_ATTR_FLAG (1 << 10) | |
221 | #define ATTR_KILL_SUID (1 << 11) | |
222 | #define ATTR_KILL_SGID (1 << 12) | |
223 | #define ATTR_FILE (1 << 13) | |
224 | #define ATTR_KILL_PRIV (1 << 14) | |
225 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
226 | #define ATTR_TIMES_SET (1 << 16) | |
f2b20f6e | 227 | #define ATTR_TOUCH (1 << 17) |
1da177e4 | 228 | |
787fb6bc MS |
229 | /* |
230 | * Whiteout is represented by a char device. The following constants define the | |
231 | * mode and device number to use. | |
232 | */ | |
233 | #define WHITEOUT_MODE 0 | |
234 | #define WHITEOUT_DEV 0 | |
235 | ||
1da177e4 LT |
236 | /* |
237 | * This is the Inode Attributes structure, used for notify_change(). It | |
238 | * uses the above definitions as flags, to know which values have changed. | |
239 | * Also, in this manner, a Filesystem can look at only the values it cares | |
240 | * about. Basically, these are the attributes that the VFS layer can | |
241 | * request to change from the FS layer. | |
242 | * | |
243 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
244 | */ | |
245 | struct iattr { | |
246 | unsigned int ia_valid; | |
247 | umode_t ia_mode; | |
92361636 EB |
248 | kuid_t ia_uid; |
249 | kgid_t ia_gid; | |
1da177e4 LT |
250 | loff_t ia_size; |
251 | struct timespec ia_atime; | |
252 | struct timespec ia_mtime; | |
253 | struct timespec ia_ctime; | |
cc4e69de MS |
254 | |
255 | /* | |
25985edc | 256 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
257 | * implement an ftruncate() like method. NOTE: filesystem should |
258 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
259 | */ | |
260 | struct file *ia_file; | |
1da177e4 LT |
261 | }; |
262 | ||
1da177e4 LT |
263 | /* |
264 | * Includes for diskquotas. | |
265 | */ | |
266 | #include <linux/quota.h> | |
267 | ||
69c433ed MS |
268 | /* |
269 | * Maximum number of layers of fs stack. Needs to be limited to | |
270 | * prevent kernel stack overflow | |
271 | */ | |
272 | #define FILESYSTEM_MAX_STACK_DEPTH 2 | |
273 | ||
994fc28c ZB |
274 | /** |
275 | * enum positive_aop_returns - aop return codes with specific semantics | |
276 | * | |
277 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
278 | * completed, that the page is still locked, and | |
279 | * should be considered active. The VM uses this hint | |
280 | * to return the page to the active list -- it won't | |
281 | * be a candidate for writeback again in the near | |
282 | * future. Other callers must be careful to unlock | |
283 | * the page if they get this return. Returned by | |
284 | * writepage(); | |
285 | * | |
286 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
287 | * unlocked it and the page might have been truncated. | |
288 | * The caller should back up to acquiring a new page and | |
289 | * trying again. The aop will be taking reasonable | |
290 | * precautions not to livelock. If the caller held a page | |
291 | * reference, it should drop it before retrying. Returned | |
55144768 | 292 | * by readpage(). |
994fc28c ZB |
293 | * |
294 | * address_space_operation functions return these large constants to indicate | |
295 | * special semantics to the caller. These are much larger than the bytes in a | |
296 | * page to allow for functions that return the number of bytes operated on in a | |
297 | * given page. | |
298 | */ | |
299 | ||
300 | enum positive_aop_returns { | |
301 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
302 | AOP_TRUNCATED_PAGE = 0x80001, | |
303 | }; | |
304 | ||
afddba49 | 305 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
89e10787 | 306 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
54566b2c NP |
307 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
308 | * helper code (eg buffer layer) | |
309 | * to clear GFP_FS from alloc */ | |
afddba49 | 310 | |
1da177e4 LT |
311 | /* |
312 | * oh the beauties of C type declarations. | |
313 | */ | |
314 | struct page; | |
315 | struct address_space; | |
316 | struct writeback_control; | |
1da177e4 | 317 | |
e2e40f2c | 318 | #define IOCB_EVENTFD (1 << 0) |
2ba48ce5 AV |
319 | #define IOCB_APPEND (1 << 1) |
320 | #define IOCB_DIRECT (1 << 2) | |
97be7ebe | 321 | #define IOCB_HIPRI (1 << 3) |
dde0c2e7 CH |
322 | #define IOCB_DSYNC (1 << 4) |
323 | #define IOCB_SYNC (1 << 5) | |
70fe2f48 | 324 | #define IOCB_WRITE (1 << 6) |
e2e40f2c CH |
325 | |
326 | struct kiocb { | |
327 | struct file *ki_filp; | |
328 | loff_t ki_pos; | |
329 | void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); | |
330 | void *private; | |
331 | int ki_flags; | |
332 | }; | |
333 | ||
334 | static inline bool is_sync_kiocb(struct kiocb *kiocb) | |
335 | { | |
336 | return kiocb->ki_complete == NULL; | |
337 | } | |
338 | ||
2ba48ce5 AV |
339 | static inline int iocb_flags(struct file *file); |
340 | ||
e2e40f2c CH |
341 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) |
342 | { | |
343 | *kiocb = (struct kiocb) { | |
344 | .ki_filp = filp, | |
2ba48ce5 | 345 | .ki_flags = iocb_flags(filp), |
e2e40f2c CH |
346 | }; |
347 | } | |
348 | ||
8ab22b9a HH |
349 | /* |
350 | * "descriptor" for what we're up to with a read. | |
351 | * This allows us to use the same read code yet | |
352 | * have multiple different users of the data that | |
353 | * we read from a file. | |
354 | * | |
355 | * The simplest case just copies the data to user | |
356 | * mode. | |
357 | */ | |
358 | typedef struct { | |
359 | size_t written; | |
360 | size_t count; | |
361 | union { | |
362 | char __user *buf; | |
363 | void *data; | |
364 | } arg; | |
365 | int error; | |
366 | } read_descriptor_t; | |
367 | ||
368 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
369 | unsigned long, unsigned long); | |
2f718ffc | 370 | |
1da177e4 LT |
371 | struct address_space_operations { |
372 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
373 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
374 | |
375 | /* Write back some dirty pages from this mapping. */ | |
376 | int (*writepages)(struct address_space *, struct writeback_control *); | |
377 | ||
4741c9fd | 378 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
379 | int (*set_page_dirty)(struct page *page); |
380 | ||
381 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
382 | struct list_head *pages, unsigned nr_pages); | |
383 | ||
afddba49 NP |
384 | int (*write_begin)(struct file *, struct address_space *mapping, |
385 | loff_t pos, unsigned len, unsigned flags, | |
386 | struct page **pagep, void **fsdata); | |
387 | int (*write_end)(struct file *, struct address_space *mapping, | |
388 | loff_t pos, unsigned len, unsigned copied, | |
389 | struct page *page, void *fsdata); | |
390 | ||
1da177e4 LT |
391 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
392 | sector_t (*bmap)(struct address_space *, sector_t); | |
d47992f8 | 393 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
27496a8c | 394 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 395 | void (*freepage)(struct page *); |
c8b8e32d | 396 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); |
b969c4ab | 397 | /* |
ef277c73 TC |
398 | * migrate the contents of a page to the specified target. If |
399 | * migrate_mode is MIGRATE_ASYNC, it must not block. | |
b969c4ab | 400 | */ |
2d1db3b1 | 401 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 402 | struct page *, struct page *, enum migrate_mode); |
bda807d4 MK |
403 | bool (*isolate_page)(struct page *, isolate_mode_t); |
404 | void (*putback_page)(struct page *); | |
e3db7691 | 405 | int (*launder_page) (struct page *); |
c186afb4 | 406 | int (*is_partially_uptodate) (struct page *, unsigned long, |
8ab22b9a | 407 | unsigned long); |
b4597226 | 408 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
25718736 | 409 | int (*error_remove_page)(struct address_space *, struct page *); |
62c230bc MG |
410 | |
411 | /* swapfile support */ | |
a509bc1a MG |
412 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
413 | sector_t *span); | |
414 | void (*swap_deactivate)(struct file *file); | |
1da177e4 LT |
415 | }; |
416 | ||
7dcda1c9 JA |
417 | extern const struct address_space_operations empty_aops; |
418 | ||
afddba49 NP |
419 | /* |
420 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
421 | * to write into the pagecache. | |
422 | */ | |
423 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
424 | loff_t pos, unsigned len, unsigned flags, | |
425 | struct page **pagep, void **fsdata); | |
426 | ||
427 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
428 | loff_t pos, unsigned len, unsigned copied, | |
429 | struct page *page, void *fsdata); | |
430 | ||
1da177e4 LT |
431 | struct address_space { |
432 | struct inode *host; /* owner: inode, block_device */ | |
433 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
19fd6231 | 434 | spinlock_t tree_lock; /* and lock protecting it */ |
4bb5f5d9 | 435 | atomic_t i_mmap_writable;/* count VM_SHARED mappings */ |
6b2dbba8 | 436 | struct rb_root i_mmap; /* tree of private and shared mappings */ |
c8c06efa | 437 | struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ |
08142579 | 438 | /* Protected by tree_lock together with the radix tree */ |
1da177e4 | 439 | unsigned long nrpages; /* number of total pages */ |
f9fe48be RZ |
440 | /* number of shadow or DAX exceptional entries */ |
441 | unsigned long nrexceptional; | |
1da177e4 | 442 | pgoff_t writeback_index;/* writeback starts here */ |
f5e54d6e | 443 | const struct address_space_operations *a_ops; /* methods */ |
9c5d760b | 444 | unsigned long flags; /* error bits */ |
1da177e4 | 445 | spinlock_t private_lock; /* for use by the address_space */ |
9c5d760b | 446 | gfp_t gfp_mask; /* implicit gfp mask for allocations */ |
1da177e4 | 447 | struct list_head private_list; /* ditto */ |
252aa6f5 | 448 | void *private_data; /* ditto */ |
1da177e4 LT |
449 | } __attribute__((aligned(sizeof(long)))); |
450 | /* | |
451 | * On most architectures that alignment is already the case; but | |
25985edc | 452 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
453 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
454 | */ | |
87192a2a | 455 | struct request_queue; |
1da177e4 LT |
456 | |
457 | struct block_device { | |
458 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 459 | int bd_openers; |
1da177e4 | 460 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 461 | struct super_block * bd_super; |
c039e313 | 462 | struct mutex bd_mutex; /* open/close mutex */ |
6b4517a7 | 463 | void * bd_claiming; |
1da177e4 LT |
464 | void * bd_holder; |
465 | int bd_holders; | |
77ea887e | 466 | bool bd_write_holder; |
641dc636 | 467 | #ifdef CONFIG_SYSFS |
49731baa | 468 | struct list_head bd_holder_disks; |
641dc636 | 469 | #endif |
1da177e4 LT |
470 | struct block_device * bd_contains; |
471 | unsigned bd_block_size; | |
472 | struct hd_struct * bd_part; | |
473 | /* number of times partitions within this device have been opened. */ | |
474 | unsigned bd_part_count; | |
475 | int bd_invalidated; | |
476 | struct gendisk * bd_disk; | |
87192a2a | 477 | struct request_queue * bd_queue; |
1da177e4 | 478 | struct list_head bd_list; |
1da177e4 LT |
479 | /* |
480 | * Private data. You must have bd_claim'ed the block_device | |
481 | * to use this. NOTE: bd_claim allows an owner to claim | |
482 | * the same device multiple times, the owner must take special | |
483 | * care to not mess up bd_private for that case. | |
484 | */ | |
485 | unsigned long bd_private; | |
fcccf502 TS |
486 | |
487 | /* The counter of freeze processes */ | |
488 | int bd_fsfreeze_count; | |
489 | /* Mutex for freeze */ | |
490 | struct mutex bd_fsfreeze_mutex; | |
1da177e4 LT |
491 | }; |
492 | ||
493 | /* | |
494 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
495 | * radix trees | |
496 | */ | |
497 | #define PAGECACHE_TAG_DIRTY 0 | |
498 | #define PAGECACHE_TAG_WRITEBACK 1 | |
f446daae | 499 | #define PAGECACHE_TAG_TOWRITE 2 |
1da177e4 LT |
500 | |
501 | int mapping_tagged(struct address_space *mapping, int tag); | |
502 | ||
8b28f621 DB |
503 | static inline void i_mmap_lock_write(struct address_space *mapping) |
504 | { | |
c8c06efa | 505 | down_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
506 | } |
507 | ||
508 | static inline void i_mmap_unlock_write(struct address_space *mapping) | |
509 | { | |
c8c06efa | 510 | up_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
511 | } |
512 | ||
3dec0ba0 DB |
513 | static inline void i_mmap_lock_read(struct address_space *mapping) |
514 | { | |
515 | down_read(&mapping->i_mmap_rwsem); | |
516 | } | |
517 | ||
518 | static inline void i_mmap_unlock_read(struct address_space *mapping) | |
519 | { | |
520 | up_read(&mapping->i_mmap_rwsem); | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* |
524 | * Might pages of this file be mapped into userspace? | |
525 | */ | |
526 | static inline int mapping_mapped(struct address_space *mapping) | |
527 | { | |
27ba0644 | 528 | return !RB_EMPTY_ROOT(&mapping->i_mmap); |
1da177e4 LT |
529 | } |
530 | ||
531 | /* | |
532 | * Might pages of this file have been modified in userspace? | |
533 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
534 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
535 | * writing i.e. vma may be mprotected writable even if now readonly. | |
4bb5f5d9 DH |
536 | * |
537 | * If i_mmap_writable is negative, no new writable mappings are allowed. You | |
538 | * can only deny writable mappings, if none exists right now. | |
1da177e4 LT |
539 | */ |
540 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
541 | { | |
4bb5f5d9 DH |
542 | return atomic_read(&mapping->i_mmap_writable) > 0; |
543 | } | |
544 | ||
545 | static inline int mapping_map_writable(struct address_space *mapping) | |
546 | { | |
547 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? | |
548 | 0 : -EPERM; | |
549 | } | |
550 | ||
551 | static inline void mapping_unmap_writable(struct address_space *mapping) | |
552 | { | |
553 | atomic_dec(&mapping->i_mmap_writable); | |
554 | } | |
555 | ||
556 | static inline int mapping_deny_writable(struct address_space *mapping) | |
557 | { | |
558 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? | |
559 | 0 : -EBUSY; | |
560 | } | |
561 | ||
562 | static inline void mapping_allow_writable(struct address_space *mapping) | |
563 | { | |
564 | atomic_inc(&mapping->i_mmap_writable); | |
1da177e4 LT |
565 | } |
566 | ||
567 | /* | |
568 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
569 | */ | |
570 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
571 | #include <linux/seqlock.h> | |
572 | #define __NEED_I_SIZE_ORDERED | |
573 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
574 | #else | |
575 | #define i_size_ordered_init(inode) do { } while (0) | |
576 | #endif | |
577 | ||
f19d4a8f AV |
578 | struct posix_acl; |
579 | #define ACL_NOT_CACHED ((void *)(-1)) | |
2a3a2a3f | 580 | #define ACL_DONT_CACHE ((void *)(-3)) |
f19d4a8f | 581 | |
b8a7a3a6 AG |
582 | static inline struct posix_acl * |
583 | uncached_acl_sentinel(struct task_struct *task) | |
584 | { | |
585 | return (void *)task + 1; | |
586 | } | |
587 | ||
588 | static inline bool | |
589 | is_uncached_acl(struct posix_acl *acl) | |
590 | { | |
591 | return (long)acl & 1; | |
592 | } | |
593 | ||
3ddcd056 LT |
594 | #define IOP_FASTPERM 0x0001 |
595 | #define IOP_LOOKUP 0x0002 | |
596 | #define IOP_NOFOLLOW 0x0004 | |
d0a5b995 | 597 | #define IOP_XATTR 0x0008 |
3ddcd056 LT |
598 | |
599 | /* | |
600 | * Keep mostly read-only and often accessed (especially for | |
601 | * the RCU path lookup and 'stat' data) fields at the beginning | |
602 | * of the 'struct inode' | |
603 | */ | |
1da177e4 | 604 | struct inode { |
44a7d7a8 | 605 | umode_t i_mode; |
3ddcd056 | 606 | unsigned short i_opflags; |
92361636 EB |
607 | kuid_t i_uid; |
608 | kgid_t i_gid; | |
3ddcd056 LT |
609 | unsigned int i_flags; |
610 | ||
611 | #ifdef CONFIG_FS_POSIX_ACL | |
612 | struct posix_acl *i_acl; | |
613 | struct posix_acl *i_default_acl; | |
614 | #endif | |
615 | ||
44a7d7a8 NP |
616 | const struct inode_operations *i_op; |
617 | struct super_block *i_sb; | |
3ddcd056 | 618 | struct address_space *i_mapping; |
44a7d7a8 | 619 | |
13e12d14 LT |
620 | #ifdef CONFIG_SECURITY |
621 | void *i_security; | |
622 | #endif | |
44a7d7a8 | 623 | |
3ddcd056 LT |
624 | /* Stat data, not accessed from path walking */ |
625 | unsigned long i_ino; | |
a78ef704 MS |
626 | /* |
627 | * Filesystems may only read i_nlink directly. They shall use the | |
628 | * following functions for modification: | |
629 | * | |
630 | * (set|clear|inc|drop)_nlink | |
631 | * inode_(inc|dec)_link_count | |
632 | */ | |
633 | union { | |
634 | const unsigned int i_nlink; | |
635 | unsigned int __i_nlink; | |
636 | }; | |
3ddcd056 | 637 | dev_t i_rdev; |
2f9d3df8 | 638 | loff_t i_size; |
3ddcd056 LT |
639 | struct timespec i_atime; |
640 | struct timespec i_mtime; | |
641 | struct timespec i_ctime; | |
6cdbb0ef TT |
642 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
643 | unsigned short i_bytes; | |
2f9d3df8 | 644 | unsigned int i_blkbits; |
3ddcd056 LT |
645 | blkcnt_t i_blocks; |
646 | ||
647 | #ifdef __NEED_I_SIZE_ORDERED | |
648 | seqcount_t i_size_seqcount; | |
649 | #endif | |
650 | ||
651 | /* Misc */ | |
652 | unsigned long i_state; | |
9902af79 | 653 | struct rw_semaphore i_rwsem; |
13e12d14 | 654 | |
44a7d7a8 | 655 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
a2f48706 | 656 | unsigned long dirtied_time_when; |
44a7d7a8 | 657 | |
1da177e4 | 658 | struct hlist_node i_hash; |
c7f54084 | 659 | struct list_head i_io_list; /* backing dev IO list */ |
52ebea74 TH |
660 | #ifdef CONFIG_CGROUP_WRITEBACK |
661 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ | |
2a814908 TH |
662 | |
663 | /* foreign inode detection, see wbc_detach_inode() */ | |
664 | int i_wb_frn_winner; | |
665 | u16 i_wb_frn_avg_time; | |
666 | u16 i_wb_frn_history; | |
52ebea74 | 667 | #endif |
7ccf19a8 | 668 | struct list_head i_lru; /* inode LRU list */ |
1da177e4 | 669 | struct list_head i_sb_list; |
6c60d2b5 | 670 | struct list_head i_wb_list; /* backing dev writeback list */ |
fa0d7e3d | 671 | union { |
b3d9b7a3 | 672 | struct hlist_head i_dentry; |
fa0d7e3d NP |
673 | struct rcu_head i_rcu; |
674 | }; | |
7a224228 | 675 | u64 i_version; |
2f9d3df8 | 676 | atomic_t i_count; |
bd5fe6c5 | 677 | atomic_t i_dio_count; |
6cdbb0ef | 678 | atomic_t i_writecount; |
d984ea60 MZ |
679 | #ifdef CONFIG_IMA |
680 | atomic_t i_readcount; /* struct files open RO */ | |
681 | #endif | |
99ac48f5 | 682 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
4a075e39 | 683 | struct file_lock_context *i_flctx; |
1da177e4 | 684 | struct address_space i_data; |
1da177e4 | 685 | struct list_head i_devices; |
4c154168 TT |
686 | union { |
687 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 688 | struct block_device *i_bdev; |
577c4eb0 | 689 | struct cdev *i_cdev; |
61ba64fc | 690 | char *i_link; |
84e710da | 691 | unsigned i_dir_seq; |
4c154168 | 692 | }; |
1da177e4 LT |
693 | |
694 | __u32 i_generation; | |
695 | ||
3be25f49 EP |
696 | #ifdef CONFIG_FSNOTIFY |
697 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
e61ce867 | 698 | struct hlist_head i_fsnotify_marks; |
0eeca283 RL |
699 | #endif |
700 | ||
0b81d077 JK |
701 | #if IS_ENABLED(CONFIG_FS_ENCRYPTION) |
702 | struct fscrypt_info *i_crypt_info; | |
703 | #endif | |
704 | ||
8e18e294 | 705 | void *i_private; /* fs or device private pointer */ |
1da177e4 LT |
706 | }; |
707 | ||
1d3382cb AV |
708 | static inline int inode_unhashed(struct inode *inode) |
709 | { | |
710 | return hlist_unhashed(&inode->i_hash); | |
711 | } | |
712 | ||
f2eace23 IM |
713 | /* |
714 | * inode->i_mutex nesting subclasses for the lock validator: | |
715 | * | |
716 | * 0: the object of the current VFS operation | |
717 | * 1: parent | |
718 | * 2: child/target | |
40bd22c9 BF |
719 | * 3: xattr |
720 | * 4: second non-directory | |
d1b72cc6 MS |
721 | * 5: second parent (when locking independent directories in rename) |
722 | * | |
723 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two | |
40bd22c9 | 724 | * non-directories at once. |
f2eace23 IM |
725 | * |
726 | * The locking order between these classes is | |
d1b72cc6 | 727 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
f2eace23 IM |
728 | */ |
729 | enum inode_i_mutex_lock_class | |
730 | { | |
731 | I_MUTEX_NORMAL, | |
732 | I_MUTEX_PARENT, | |
733 | I_MUTEX_CHILD, | |
4df46240 | 734 | I_MUTEX_XATTR, |
d1b72cc6 MS |
735 | I_MUTEX_NONDIR2, |
736 | I_MUTEX_PARENT2, | |
f2eace23 IM |
737 | }; |
738 | ||
5955102c AV |
739 | static inline void inode_lock(struct inode *inode) |
740 | { | |
9902af79 | 741 | down_write(&inode->i_rwsem); |
5955102c AV |
742 | } |
743 | ||
744 | static inline void inode_unlock(struct inode *inode) | |
745 | { | |
9902af79 AV |
746 | up_write(&inode->i_rwsem); |
747 | } | |
748 | ||
749 | static inline void inode_lock_shared(struct inode *inode) | |
750 | { | |
751 | down_read(&inode->i_rwsem); | |
752 | } | |
753 | ||
754 | static inline void inode_unlock_shared(struct inode *inode) | |
755 | { | |
756 | up_read(&inode->i_rwsem); | |
5955102c AV |
757 | } |
758 | ||
759 | static inline int inode_trylock(struct inode *inode) | |
760 | { | |
9902af79 AV |
761 | return down_write_trylock(&inode->i_rwsem); |
762 | } | |
763 | ||
764 | static inline int inode_trylock_shared(struct inode *inode) | |
765 | { | |
766 | return down_read_trylock(&inode->i_rwsem); | |
5955102c AV |
767 | } |
768 | ||
769 | static inline int inode_is_locked(struct inode *inode) | |
770 | { | |
9902af79 | 771 | return rwsem_is_locked(&inode->i_rwsem); |
5955102c AV |
772 | } |
773 | ||
774 | static inline void inode_lock_nested(struct inode *inode, unsigned subclass) | |
775 | { | |
9902af79 | 776 | down_write_nested(&inode->i_rwsem, subclass); |
5955102c AV |
777 | } |
778 | ||
375e289e BF |
779 | void lock_two_nondirectories(struct inode *, struct inode*); |
780 | void unlock_two_nondirectories(struct inode *, struct inode*); | |
781 | ||
1da177e4 LT |
782 | /* |
783 | * NOTE: in a 32bit arch with a preemptable kernel and | |
784 | * an UP compile the i_size_read/write must be atomic | |
785 | * with respect to the local cpu (unlike with preempt disabled), | |
786 | * but they don't need to be atomic with respect to other cpus like in | |
787 | * true SMP (so they need either to either locally disable irq around | |
788 | * the read or for example on x86 they can be still implemented as a | |
789 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
790 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
791 | */ | |
48ed214d | 792 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
793 | { |
794 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
795 | loff_t i_size; | |
796 | unsigned int seq; | |
797 | ||
798 | do { | |
799 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
800 | i_size = inode->i_size; | |
801 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
802 | return i_size; | |
803 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
804 | loff_t i_size; | |
805 | ||
806 | preempt_disable(); | |
807 | i_size = inode->i_size; | |
808 | preempt_enable(); | |
809 | return i_size; | |
810 | #else | |
811 | return inode->i_size; | |
812 | #endif | |
813 | } | |
814 | ||
7762f5a0 MS |
815 | /* |
816 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
817 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
818 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
819 | */ | |
1da177e4 LT |
820 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
821 | { | |
822 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
74e3d1e1 | 823 | preempt_disable(); |
1da177e4 LT |
824 | write_seqcount_begin(&inode->i_size_seqcount); |
825 | inode->i_size = i_size; | |
826 | write_seqcount_end(&inode->i_size_seqcount); | |
74e3d1e1 | 827 | preempt_enable(); |
1da177e4 LT |
828 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
829 | preempt_disable(); | |
830 | inode->i_size = i_size; | |
831 | preempt_enable(); | |
832 | #else | |
833 | inode->i_size = i_size; | |
834 | #endif | |
835 | } | |
836 | ||
48ed214d | 837 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
838 | { |
839 | return MINOR(inode->i_rdev); | |
840 | } | |
841 | ||
48ed214d | 842 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
843 | { |
844 | return MAJOR(inode->i_rdev); | |
845 | } | |
846 | ||
847 | extern struct block_device *I_BDEV(struct inode *inode); | |
848 | ||
849 | struct fown_struct { | |
850 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
851 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
852 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
92361636 | 853 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
854 | int signum; /* posix.1b rt signal to be delivered on IO */ |
855 | }; | |
856 | ||
857 | /* | |
858 | * Track a single file's readahead state | |
859 | */ | |
860 | struct file_ra_state { | |
937085aa FW |
861 | pgoff_t start; /* where readahead started */ |
862 | unsigned int size; /* # of readahead pages */ | |
863 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 864 | there are only # of pages ahead */ |
5ce1110b | 865 | |
937085aa | 866 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 867 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 868 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 869 | }; |
1da177e4 | 870 | |
5ce1110b FW |
871 | /* |
872 | * Check if @index falls in the readahead windows. | |
873 | */ | |
874 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
875 | { | |
f9acc8c7 FW |
876 | return (index >= ra->start && |
877 | index < ra->start + ra->size); | |
5ce1110b FW |
878 | } |
879 | ||
1da177e4 | 880 | struct file { |
2f512016 | 881 | union { |
4f5e65a1 | 882 | struct llist_node fu_llist; |
2f512016 ED |
883 | struct rcu_head fu_rcuhead; |
884 | } f_u; | |
0f7fc9e4 | 885 | struct path f_path; |
dd37978c | 886 | struct inode *f_inode; /* cached value */ |
99ac48f5 | 887 | const struct file_operations *f_op; |
ef3d0fd2 AK |
888 | |
889 | /* | |
9c225f26 | 890 | * Protects f_ep_links, f_flags. |
ef3d0fd2 AK |
891 | * Must not be taken from IRQ context. |
892 | */ | |
893 | spinlock_t f_lock; | |
516e0cc5 | 894 | atomic_long_t f_count; |
1da177e4 | 895 | unsigned int f_flags; |
aeb5d727 | 896 | fmode_t f_mode; |
9c225f26 | 897 | struct mutex f_pos_lock; |
1da177e4 LT |
898 | loff_t f_pos; |
899 | struct fown_struct f_owner; | |
d76b0d9b | 900 | const struct cred *f_cred; |
1da177e4 LT |
901 | struct file_ra_state f_ra; |
902 | ||
2b47c361 | 903 | u64 f_version; |
50462062 | 904 | #ifdef CONFIG_SECURITY |
1da177e4 | 905 | void *f_security; |
50462062 | 906 | #endif |
1da177e4 LT |
907 | /* needed for tty driver, and maybe others */ |
908 | void *private_data; | |
909 | ||
910 | #ifdef CONFIG_EPOLL | |
911 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
912 | struct list_head f_ep_links; | |
28d82dc1 | 913 | struct list_head f_tfile_llink; |
1da177e4 LT |
914 | #endif /* #ifdef CONFIG_EPOLL */ |
915 | struct address_space *f_mapping; | |
bd2a31d5 | 916 | } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
1da177e4 | 917 | |
990d6c2d AK |
918 | struct file_handle { |
919 | __u32 handle_bytes; | |
920 | int handle_type; | |
921 | /* file identifier */ | |
922 | unsigned char f_handle[0]; | |
923 | }; | |
924 | ||
cb0942b8 AV |
925 | static inline struct file *get_file(struct file *f) |
926 | { | |
927 | atomic_long_inc(&f->f_count); | |
928 | return f; | |
929 | } | |
90f31d0e | 930 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
d7065da0 | 931 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
516e0cc5 | 932 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 LT |
933 | |
934 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
935 | ||
936 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
937 | limits, otherwise bad things can happen in VM. */ | |
938 | #if BITS_PER_LONG==32 | |
09cbfeaf | 939 | #define MAX_LFS_FILESIZE (((loff_t)PAGE_SIZE << (BITS_PER_LONG-1))-1) |
1da177e4 | 940 | #elif BITS_PER_LONG==64 |
614c321f | 941 | #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) |
1da177e4 LT |
942 | #endif |
943 | ||
944 | #define FL_POSIX 1 | |
945 | #define FL_FLOCK 2 | |
617588d5 | 946 | #define FL_DELEG 4 /* NFSv4 delegation */ |
1da177e4 | 947 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
f475ae95 | 948 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 949 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 950 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 951 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
952 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
953 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
cff2fce5 | 954 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
11afe9f7 | 955 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
1da177e4 | 956 | |
bde74e4b MS |
957 | /* |
958 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
959 | * asynchronous locking. | |
960 | */ | |
961 | #define FILE_LOCK_DEFERRED 1 | |
962 | ||
7ca76311 | 963 | /* legacy typedef, should eventually be removed */ |
17fa388d | 964 | typedef void *fl_owner_t; |
1da177e4 | 965 | |
a7231a97 JL |
966 | struct file_lock; |
967 | ||
1da177e4 | 968 | struct file_lock_operations { |
1da177e4 LT |
969 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
970 | void (*fl_release_private)(struct file_lock *); | |
971 | }; | |
972 | ||
973 | struct lock_manager_operations { | |
8fb47a4f | 974 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
3999e493 | 975 | unsigned long (*lm_owner_key)(struct file_lock *); |
cae80b30 JL |
976 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
977 | void (*lm_put_owner)(fl_owner_t); | |
8fb47a4f | 978 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
d0449b90 | 979 | int (*lm_grant)(struct file_lock *, int); |
4d01b7f5 | 980 | bool (*lm_break)(struct file_lock *); |
7448cc37 | 981 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
1c7dd2ff | 982 | void (*lm_setup)(struct file_lock *, void **); |
1da177e4 LT |
983 | }; |
984 | ||
af558e33 BF |
985 | struct lock_manager { |
986 | struct list_head list; | |
c87fb4a3 BF |
987 | /* |
988 | * NFSv4 and up also want opens blocked during the grace period; | |
989 | * NLM doesn't care: | |
990 | */ | |
991 | bool block_opens; | |
af558e33 BF |
992 | }; |
993 | ||
5ccb0066 SK |
994 | struct net; |
995 | void locks_start_grace(struct net *, struct lock_manager *); | |
af558e33 | 996 | void locks_end_grace(struct lock_manager *); |
5ccb0066 | 997 | int locks_in_grace(struct net *); |
c87fb4a3 | 998 | int opens_in_grace(struct net *); |
af558e33 | 999 | |
1da177e4 LT |
1000 | /* that will die - we need it for nfs_lock_info */ |
1001 | #include <linux/nfs_fs_i.h> | |
1002 | ||
1cb36012 JL |
1003 | /* |
1004 | * struct file_lock represents a generic "file lock". It's used to represent | |
1005 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to | |
1006 | * note that the same struct is used to represent both a request for a lock and | |
1007 | * the lock itself, but the same object is never used for both. | |
1008 | * | |
1009 | * FIXME: should we create a separate "struct lock_request" to help distinguish | |
1010 | * these two uses? | |
1011 | * | |
8116bf4c | 1012 | * The varous i_flctx lists are ordered by: |
1cb36012 | 1013 | * |
8116bf4c JL |
1014 | * 1) lock owner |
1015 | * 2) lock range start | |
1016 | * 3) lock range end | |
1cb36012 JL |
1017 | * |
1018 | * Obviously, the last two criteria only matter for POSIX locks. | |
1019 | */ | |
1da177e4 LT |
1020 | struct file_lock { |
1021 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
6dee60f6 | 1022 | struct list_head fl_list; /* link into file_lock_context */ |
139ca04e | 1023 | struct hlist_node fl_link; /* node in global lists */ |
1da177e4 LT |
1024 | struct list_head fl_block; /* circular list of blocked processes */ |
1025 | fl_owner_t fl_owner; | |
710b7216 | 1026 | unsigned int fl_flags; |
afc1246f | 1027 | unsigned char fl_type; |
1da177e4 | 1028 | unsigned int fl_pid; |
7012b02a | 1029 | int fl_link_cpu; /* what cpu's list is this on? */ |
ab1f1611 | 1030 | struct pid *fl_nspid; |
1da177e4 LT |
1031 | wait_queue_head_t fl_wait; |
1032 | struct file *fl_file; | |
1da177e4 LT |
1033 | loff_t fl_start; |
1034 | loff_t fl_end; | |
1035 | ||
1036 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
1037 | /* for lease breaks: */ |
1038 | unsigned long fl_break_time; | |
1039 | unsigned long fl_downgrade_time; | |
1da177e4 | 1040 | |
6aed6285 | 1041 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 1042 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
1043 | union { |
1044 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 1045 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
1046 | struct { |
1047 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
1048 | int state; /* state of grant or error if -ve */ | |
1049 | } afs; | |
1da177e4 LT |
1050 | } fl_u; |
1051 | }; | |
1052 | ||
4a075e39 | 1053 | struct file_lock_context { |
6109c850 | 1054 | spinlock_t flc_lock; |
4a075e39 | 1055 | struct list_head flc_flock; |
bd61e0a9 | 1056 | struct list_head flc_posix; |
8634b51f | 1057 | struct list_head flc_lease; |
4a075e39 JL |
1058 | }; |
1059 | ||
1da177e4 LT |
1060 | /* The following constant reflects the upper bound of the file/locking space */ |
1061 | #ifndef OFFSET_MAX | |
1062 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1063 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1064 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1065 | #endif | |
1066 | ||
1da177e4 LT |
1067 | #include <linux/fcntl.h> |
1068 | ||
bfcd17a6 TP |
1069 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1070 | ||
c568d683 MS |
1071 | /* |
1072 | * Return the inode to use for locking | |
1073 | * | |
1074 | * For overlayfs this should be the overlay inode, not the real inode returned | |
1075 | * by file_inode(). For any other fs file_inode(filp) and locks_inode(filp) are | |
1076 | * equal. | |
1077 | */ | |
1078 | static inline struct inode *locks_inode(const struct file *f) | |
1079 | { | |
1080 | return f->f_path.dentry->d_inode; | |
1081 | } | |
1082 | ||
bfcd17a6 | 1083 | #ifdef CONFIG_FILE_LOCKING |
c1e62b8f | 1084 | extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *); |
c293621b PS |
1085 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
1086 | struct flock __user *); | |
1da177e4 LT |
1087 | |
1088 | #if BITS_PER_LONG == 32 | |
c1e62b8f | 1089 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *); |
c293621b PS |
1090 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1091 | struct flock64 __user *); | |
1da177e4 LT |
1092 | #endif |
1093 | ||
1da177e4 LT |
1094 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1095 | extern int fcntl_getlease(struct file *filp); | |
1096 | ||
1097 | /* fs/locks.c */ | |
f27a0fe0 | 1098 | void locks_free_lock_context(struct inode *inode); |
05fa3135 | 1099 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1100 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1101 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1102 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
3fe0fff1 | 1103 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
1da177e4 | 1104 | extern void locks_remove_posix(struct file *, fl_owner_t); |
78ed8a13 | 1105 | extern void locks_remove_file(struct file *); |
a9e61e25 | 1106 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1107 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1108 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
f891a29f | 1109 | extern int posix_unblock_lock(struct file_lock *); |
3ee17abd | 1110 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1111 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1112 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
e55c34a6 | 1113 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
df4e8d2c | 1114 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
1da177e4 | 1115 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
e6f5c789 JL |
1116 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
1117 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); | |
7448cc37 | 1118 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
6c8c9031 AV |
1119 | struct files_struct; |
1120 | extern void show_fd_locks(struct seq_file *f, | |
1121 | struct file *filp, struct files_struct *files); | |
bfcd17a6 | 1122 | #else /* !CONFIG_FILE_LOCKING */ |
c1e62b8f JL |
1123 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
1124 | struct flock __user *user) | |
c2aca5e5 SW |
1125 | { |
1126 | return -EINVAL; | |
1127 | } | |
1128 | ||
1129 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1130 | unsigned int cmd, struct flock __user *user) | |
1131 | { | |
1132 | return -EACCES; | |
1133 | } | |
1134 | ||
bfcd17a6 | 1135 | #if BITS_PER_LONG == 32 |
c1e62b8f JL |
1136 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
1137 | struct flock64 __user *user) | |
c2aca5e5 SW |
1138 | { |
1139 | return -EINVAL; | |
1140 | } | |
1141 | ||
1142 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1143 | unsigned int cmd, struct flock64 __user *user) | |
1144 | { | |
1145 | return -EACCES; | |
1146 | } | |
bfcd17a6 | 1147 | #endif |
c2aca5e5 SW |
1148 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1149 | { | |
1b2b32dc | 1150 | return -EINVAL; |
c2aca5e5 SW |
1151 | } |
1152 | ||
1153 | static inline int fcntl_getlease(struct file *filp) | |
1154 | { | |
1b2b32dc | 1155 | return F_UNLCK; |
c2aca5e5 SW |
1156 | } |
1157 | ||
4a075e39 | 1158 | static inline void |
f27a0fe0 | 1159 | locks_free_lock_context(struct inode *inode) |
4a075e39 JL |
1160 | { |
1161 | } | |
1162 | ||
c2aca5e5 SW |
1163 | static inline void locks_init_lock(struct file_lock *fl) |
1164 | { | |
1165 | return; | |
1166 | } | |
1167 | ||
3fe0fff1 | 1168 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
c2aca5e5 SW |
1169 | { |
1170 | return; | |
1171 | } | |
1172 | ||
1173 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1174 | { | |
1175 | return; | |
1176 | } | |
1177 | ||
1178 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1179 | { | |
1180 | return; | |
1181 | } | |
1182 | ||
78ed8a13 | 1183 | static inline void locks_remove_file(struct file *filp) |
c2aca5e5 SW |
1184 | { |
1185 | return; | |
1186 | } | |
1187 | ||
1188 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1189 | { | |
1190 | return; | |
1191 | } | |
1192 | ||
1193 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1194 | struct file_lock *conflock) | |
1195 | { | |
1196 | return -ENOLCK; | |
1197 | } | |
1198 | ||
f891a29f | 1199 | static inline int posix_unblock_lock(struct file_lock *waiter) |
c2aca5e5 SW |
1200 | { |
1201 | return -ENOENT; | |
1202 | } | |
1203 | ||
1204 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1205 | { | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1210 | struct file_lock *fl, struct file_lock *conf) | |
1211 | { | |
1212 | return -ENOLCK; | |
1213 | } | |
1214 | ||
1215 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1216 | { | |
1217 | return 0; | |
1218 | } | |
1219 | ||
e55c34a6 BC |
1220 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
1221 | { | |
1222 | return -ENOLCK; | |
1223 | } | |
1224 | ||
df4e8d2c | 1225 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
c2aca5e5 SW |
1226 | { |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) | |
1231 | { | |
1232 | return; | |
1233 | } | |
1234 | ||
1235 | static inline int generic_setlease(struct file *filp, long arg, | |
e6f5c789 | 1236 | struct file_lock **flp, void **priv) |
c2aca5e5 SW |
1237 | { |
1238 | return -EINVAL; | |
1239 | } | |
1240 | ||
1241 | static inline int vfs_setlease(struct file *filp, long arg, | |
e6f5c789 | 1242 | struct file_lock **lease, void **priv) |
c2aca5e5 SW |
1243 | { |
1244 | return -EINVAL; | |
1245 | } | |
1246 | ||
7448cc37 | 1247 | static inline int lease_modify(struct file_lock *fl, int arg, |
c45198ed | 1248 | struct list_head *dispose) |
c2aca5e5 SW |
1249 | { |
1250 | return -EINVAL; | |
1251 | } | |
6c8c9031 AV |
1252 | |
1253 | struct files_struct; | |
1254 | static inline void show_fd_locks(struct seq_file *f, | |
1255 | struct file *filp, struct files_struct *files) {} | |
bfcd17a6 TP |
1256 | #endif /* !CONFIG_FILE_LOCKING */ |
1257 | ||
ee296d7c JL |
1258 | static inline struct inode *file_inode(const struct file *f) |
1259 | { | |
1260 | return f->f_inode; | |
1261 | } | |
1262 | ||
d101a125 MS |
1263 | static inline struct dentry *file_dentry(const struct file *file) |
1264 | { | |
2d902671 | 1265 | return d_real(file->f_path.dentry, file_inode(file), 0); |
d101a125 MS |
1266 | } |
1267 | ||
e55c34a6 BC |
1268 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
1269 | { | |
c568d683 | 1270 | return locks_lock_inode_wait(locks_inode(filp), fl); |
e55c34a6 BC |
1271 | } |
1272 | ||
1da177e4 | 1273 | struct fasync_struct { |
989a2979 ED |
1274 | spinlock_t fa_lock; |
1275 | int magic; | |
1276 | int fa_fd; | |
1277 | struct fasync_struct *fa_next; /* singly linked list */ | |
1278 | struct file *fa_file; | |
1279 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1280 | }; |
1281 | ||
1282 | #define FASYNC_MAGIC 0x4601 | |
1283 | ||
1284 | /* SMP safe fasync helpers: */ | |
1285 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1286 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1287 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1288 | extern struct fasync_struct *fasync_alloc(void); | |
1289 | extern void fasync_free(struct fasync_struct *); | |
1290 | ||
1da177e4 LT |
1291 | /* can be called from interrupts */ |
1292 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1293 | |
e0b93edd JL |
1294 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1295 | extern void f_setown(struct file *filp, unsigned long arg, int force); | |
1da177e4 | 1296 | extern void f_delown(struct file *filp); |
609d7fa9 | 1297 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1298 | extern int send_sigurg(struct fown_struct *fown); |
1299 | ||
5accdf82 JK |
1300 | struct mm_struct; |
1301 | ||
1da177e4 LT |
1302 | /* |
1303 | * Umount options | |
1304 | */ | |
1305 | ||
1306 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1307 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1308 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1309 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1310 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 | 1311 | |
46b15caa TH |
1312 | /* sb->s_iflags */ |
1313 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ | |
90f8572b | 1314 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
a2982cc9 | 1315 | #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */ |
1da177e4 | 1316 | |
8654df4e EB |
1317 | /* sb->s_iflags to limit user namespace mounts */ |
1318 | #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */ | |
1da177e4 | 1319 | |
5accdf82 JK |
1320 | /* Possible states of 'frozen' field */ |
1321 | enum { | |
1322 | SB_UNFROZEN = 0, /* FS is unfrozen */ | |
1323 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ | |
5accdf82 JK |
1324 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1325 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop | |
1326 | * internal threads if needed) */ | |
1327 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ | |
1328 | }; | |
1329 | ||
1330 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) | |
1331 | ||
1332 | struct sb_writers { | |
8129ed29 ON |
1333 | int frozen; /* Is sb frozen? */ |
1334 | wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ | |
1335 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; | |
5accdf82 JK |
1336 | }; |
1337 | ||
1da177e4 LT |
1338 | struct super_block { |
1339 | struct list_head s_list; /* Keep this first */ | |
1340 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
270ba5f7 RK |
1341 | unsigned char s_blocksize_bits; |
1342 | unsigned long s_blocksize; | |
42cb56ae | 1343 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1344 | struct file_system_type *s_type; |
ee9b6d61 | 1345 | const struct super_operations *s_op; |
61e225dc | 1346 | const struct dquot_operations *dq_op; |
0d54b217 | 1347 | const struct quotactl_ops *s_qcop; |
39655164 | 1348 | const struct export_operations *s_export_op; |
1da177e4 | 1349 | unsigned long s_flags; |
46b15caa | 1350 | unsigned long s_iflags; /* internal SB_I_* flags */ |
1da177e4 LT |
1351 | unsigned long s_magic; |
1352 | struct dentry *s_root; | |
1353 | struct rw_semaphore s_umount; | |
1da177e4 | 1354 | int s_count; |
1da177e4 | 1355 | atomic_t s_active; |
50462062 | 1356 | #ifdef CONFIG_SECURITY |
1da177e4 | 1357 | void *s_security; |
50462062 | 1358 | #endif |
bb435453 | 1359 | const struct xattr_handler **s_xattr; |
1da177e4 | 1360 | |
0b81d077 JK |
1361 | const struct fscrypt_operations *s_cop; |
1362 | ||
ceb5bdc2 | 1363 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
39f7c4db | 1364 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1da177e4 | 1365 | struct block_device *s_bdev; |
32a88aa1 | 1366 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1367 | struct mtd_info *s_mtd; |
a5166169 | 1368 | struct hlist_node s_instances; |
2c5f648a | 1369 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
1da177e4 LT |
1370 | struct quota_info s_dquot; /* Diskquota specific options */ |
1371 | ||
5accdf82 | 1372 | struct sb_writers s_writers; |
1da177e4 LT |
1373 | |
1374 | char s_id[32]; /* Informational name */ | |
0bba0169 | 1375 | u8 s_uuid[16]; /* UUID */ |
1da177e4 LT |
1376 | |
1377 | void *s_fs_info; /* Filesystem private info */ | |
8de52778 | 1378 | unsigned int s_max_links; |
30c40d2c | 1379 | fmode_t s_mode; |
1da177e4 | 1380 | |
270ba5f7 RK |
1381 | /* Granularity of c/m/atime in ns. |
1382 | Cannot be worse than a second */ | |
1383 | u32 s_time_gran; | |
1384 | ||
1da177e4 LT |
1385 | /* |
1386 | * The next field is for VFS *only*. No filesystems have any business | |
1387 | * even looking at it. You had been warned. | |
1388 | */ | |
a11f3a05 | 1389 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1390 | |
79c0b2df MS |
1391 | /* |
1392 | * Filesystem subtype. If non-empty the filesystem type field | |
1393 | * in /proc/mounts will be "type.subtype" | |
1394 | */ | |
1395 | char *s_subtype; | |
b3b304a2 MS |
1396 | |
1397 | /* | |
1398 | * Saved mount options for lazy filesystems using | |
1399 | * generic_show_options() | |
1400 | */ | |
4d2deb40 | 1401 | char __rcu *s_options; |
c8aebb0c | 1402 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1403 | |
1404 | /* | |
1405 | * Saved pool identifier for cleancache (-1 means none) | |
1406 | */ | |
1407 | int cleancache_poolid; | |
b0d40c92 DC |
1408 | |
1409 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1410 | |
7ada4db8 MS |
1411 | /* Number of inodes with nlink == 0 but still referenced */ |
1412 | atomic_long_t s_remove_count; | |
1413 | ||
4ed5e82f MS |
1414 | /* Being remounted read-only */ |
1415 | int s_readonly_remount; | |
7b7a8665 CH |
1416 | |
1417 | /* AIO completions deferred from interrupt context */ | |
1418 | struct workqueue_struct *s_dio_done_wq; | |
215752fc | 1419 | struct hlist_head s_pins; |
f6041567 | 1420 | |
6e4eab57 EB |
1421 | /* |
1422 | * Owning user namespace and default context in which to | |
1423 | * interpret filesystem uids, gids, quotas, device nodes, | |
1424 | * xattrs and security labels. | |
1425 | */ | |
1426 | struct user_namespace *s_user_ns; | |
1427 | ||
f6041567 DC |
1428 | /* |
1429 | * Keep the lru lists last in the structure so they always sit on their | |
1430 | * own individual cachelines. | |
1431 | */ | |
1432 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; | |
1433 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; | |
e2fec7c3 | 1434 | struct rcu_head rcu; |
853b39a7 | 1435 | struct work_struct destroy_work; |
69c433ed | 1436 | |
e97fedb9 | 1437 | struct mutex s_sync_lock; /* sync serialisation lock */ |
69c433ed MS |
1438 | |
1439 | /* | |
1440 | * Indicates how deep in a filesystem stack this SB is | |
1441 | */ | |
1442 | int s_stack_depth; | |
74278da9 DC |
1443 | |
1444 | /* s_inode_list_lock protects s_inodes */ | |
1445 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; | |
1446 | struct list_head s_inodes; /* all inodes */ | |
6c60d2b5 DC |
1447 | |
1448 | spinlock_t s_inode_wblist_lock; | |
1449 | struct list_head s_inodes_wb; /* writeback inodes */ | |
1da177e4 LT |
1450 | }; |
1451 | ||
81754357 SF |
1452 | /* Helper functions so that in most cases filesystems will |
1453 | * not need to deal directly with kuid_t and kgid_t and can | |
1454 | * instead deal with the raw numeric values that are stored | |
1455 | * in the filesystem. | |
1456 | */ | |
1457 | static inline uid_t i_uid_read(const struct inode *inode) | |
1458 | { | |
1459 | return from_kuid(inode->i_sb->s_user_ns, inode->i_uid); | |
1460 | } | |
1461 | ||
1462 | static inline gid_t i_gid_read(const struct inode *inode) | |
1463 | { | |
1464 | return from_kgid(inode->i_sb->s_user_ns, inode->i_gid); | |
1465 | } | |
1466 | ||
1467 | static inline void i_uid_write(struct inode *inode, uid_t uid) | |
1468 | { | |
1469 | inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid); | |
1470 | } | |
1471 | ||
1472 | static inline void i_gid_write(struct inode *inode, gid_t gid) | |
1473 | { | |
1474 | inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); | |
1475 | } | |
1476 | ||
1da177e4 | 1477 | extern struct timespec current_fs_time(struct super_block *sb); |
3cd88666 | 1478 | extern struct timespec current_time(struct inode *inode); |
1da177e4 LT |
1479 | |
1480 | /* | |
1481 | * Snapshotting support. | |
1482 | */ | |
1da177e4 | 1483 | |
5accdf82 JK |
1484 | void __sb_end_write(struct super_block *sb, int level); |
1485 | int __sb_start_write(struct super_block *sb, int level, bool wait); | |
1486 | ||
bee9182d | 1487 | #define __sb_writers_acquired(sb, lev) \ |
8129ed29 | 1488 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1489 | #define __sb_writers_release(sb, lev) \ |
8129ed29 | 1490 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1491 | |
5accdf82 JK |
1492 | /** |
1493 | * sb_end_write - drop write access to a superblock | |
1494 | * @sb: the super we wrote to | |
1495 | * | |
1496 | * Decrement number of writers to the filesystem. Wake up possible waiters | |
1497 | * wanting to freeze the filesystem. | |
1498 | */ | |
1499 | static inline void sb_end_write(struct super_block *sb) | |
1500 | { | |
1501 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1502 | } | |
1503 | ||
1504 | /** | |
1505 | * sb_end_pagefault - drop write access to a superblock from a page fault | |
1506 | * @sb: the super we wrote to | |
1507 | * | |
1508 | * Decrement number of processes handling write page fault to the filesystem. | |
1509 | * Wake up possible waiters wanting to freeze the filesystem. | |
1510 | */ | |
1511 | static inline void sb_end_pagefault(struct super_block *sb) | |
1512 | { | |
1513 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); | |
1514 | } | |
1515 | ||
1516 | /** | |
1517 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes | |
1518 | * @sb: the super we wrote to | |
1519 | * | |
1520 | * Decrement fs-internal number of writers to the filesystem. Wake up possible | |
1521 | * waiters wanting to freeze the filesystem. | |
1522 | */ | |
1523 | static inline void sb_end_intwrite(struct super_block *sb) | |
1524 | { | |
1525 | __sb_end_write(sb, SB_FREEZE_FS); | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * sb_start_write - get write access to a superblock | |
1530 | * @sb: the super we write to | |
1531 | * | |
1532 | * When a process wants to write data or metadata to a file system (i.e. dirty | |
1533 | * a page or an inode), it should embed the operation in a sb_start_write() - | |
1534 | * sb_end_write() pair to get exclusion against file system freezing. This | |
1535 | * function increments number of writers preventing freezing. If the file | |
1536 | * system is already frozen, the function waits until the file system is | |
1537 | * thawed. | |
1538 | * | |
1539 | * Since freeze protection behaves as a lock, users have to preserve | |
1540 | * ordering of freeze protection and other filesystem locks. Generally, | |
1541 | * freeze protection should be the outermost lock. In particular, we have: | |
1542 | * | |
1543 | * sb_start_write | |
1544 | * -> i_mutex (write path, truncate, directory ops, ...) | |
1545 | * -> s_umount (freeze_super, thaw_super) | |
1546 | */ | |
1547 | static inline void sb_start_write(struct super_block *sb) | |
1548 | { | |
1549 | __sb_start_write(sb, SB_FREEZE_WRITE, true); | |
1550 | } | |
1551 | ||
1552 | static inline int sb_start_write_trylock(struct super_block *sb) | |
1553 | { | |
1554 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); | |
1555 | } | |
1556 | ||
1557 | /** | |
1558 | * sb_start_pagefault - get write access to a superblock from a page fault | |
1559 | * @sb: the super we write to | |
1560 | * | |
1561 | * When a process starts handling write page fault, it should embed the | |
1562 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get | |
1563 | * exclusion against file system freezing. This is needed since the page fault | |
1564 | * is going to dirty a page. This function increments number of running page | |
1565 | * faults preventing freezing. If the file system is already frozen, the | |
1566 | * function waits until the file system is thawed. | |
1567 | * | |
1568 | * Since page fault freeze protection behaves as a lock, users have to preserve | |
1569 | * ordering of freeze protection and other filesystem locks. It is advised to | |
1570 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault | |
1571 | * handling code implies lock dependency: | |
1572 | * | |
1573 | * mmap_sem | |
1574 | * -> sb_start_pagefault | |
1575 | */ | |
1576 | static inline void sb_start_pagefault(struct super_block *sb) | |
1577 | { | |
1578 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); | |
1579 | } | |
1580 | ||
1581 | /* | |
1582 | * sb_start_intwrite - get write access to a superblock for internal fs purposes | |
1583 | * @sb: the super we write to | |
1584 | * | |
1585 | * This is the third level of protection against filesystem freezing. It is | |
1586 | * free for use by a filesystem. The only requirement is that it must rank | |
1587 | * below sb_start_pagefault. | |
1588 | * | |
1589 | * For example filesystem can call sb_start_intwrite() when starting a | |
1590 | * transaction which somewhat eases handling of freezing for internal sources | |
1591 | * of filesystem changes (internal fs threads, discarding preallocation on file | |
1592 | * close, etc.). | |
1593 | */ | |
1594 | static inline void sb_start_intwrite(struct super_block *sb) | |
1595 | { | |
1596 | __sb_start_write(sb, SB_FREEZE_FS, true); | |
1597 | } | |
1da177e4 | 1598 | |
1da177e4 | 1599 | |
2e149670 | 1600 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1601 | |
1da177e4 LT |
1602 | /* |
1603 | * VFS helper functions.. | |
1604 | */ | |
312b63fb | 1605 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 1606 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1607 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1608 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
146a8595 | 1609 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
1da177e4 | 1610 | extern int vfs_rmdir(struct inode *, struct dentry *); |
b21996e3 | 1611 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
520c8b16 | 1612 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
787fb6bc | 1613 | extern int vfs_whiteout(struct inode *, struct dentry *); |
1da177e4 | 1614 | |
8c744fb8 CH |
1615 | /* |
1616 | * VFS file helper functions. | |
1617 | */ | |
a1bd120d | 1618 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1619 | umode_t mode); |
a2982cc9 | 1620 | extern bool may_open_dev(const struct path *path); |
c4b929b8 MF |
1621 | /* |
1622 | * VFS FS_IOC_FIEMAP helper definitions. | |
1623 | */ | |
1624 | struct fiemap_extent_info { | |
1625 | unsigned int fi_flags; /* Flags as passed from user */ | |
1626 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1627 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1628 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1629 | fiemap_extent array */ | |
c4b929b8 MF |
1630 | }; |
1631 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1632 | u64 phys, u64 len, u32 flags); | |
1633 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1634 | ||
1da177e4 LT |
1635 | /* |
1636 | * File types | |
1637 | * | |
1638 | * NOTE! These match bits 12..15 of stat.st_mode | |
1639 | * (ie "(i_mode >> 12) & 15"). | |
1640 | */ | |
1641 | #define DT_UNKNOWN 0 | |
1642 | #define DT_FIFO 1 | |
1643 | #define DT_CHR 2 | |
1644 | #define DT_DIR 4 | |
1645 | #define DT_BLK 6 | |
1646 | #define DT_REG 8 | |
1647 | #define DT_LNK 10 | |
1648 | #define DT_SOCK 12 | |
1649 | #define DT_WHT 14 | |
1650 | ||
1da177e4 LT |
1651 | /* |
1652 | * This is the "filldir" function type, used by readdir() to let | |
1653 | * the kernel specify what kind of dirent layout it wants to have. | |
1654 | * This allows the kernel to read directories into kernel space or | |
1655 | * to have different dirent layouts depending on the binary type. | |
1656 | */ | |
ac7576f4 MS |
1657 | struct dir_context; |
1658 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, | |
1659 | unsigned); | |
1660 | ||
5c0ba4e0 | 1661 | struct dir_context { |
ac6614b7 | 1662 | const filldir_t actor; |
bb6f619b | 1663 | loff_t pos; |
5c0ba4e0 | 1664 | }; |
bb6f619b | 1665 | |
08f85851 | 1666 | struct block_device_operations; |
1da177e4 | 1667 | |
1da177e4 LT |
1668 | /* These macros are for out of kernel modules to test that |
1669 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1670 | * fields in struct file_operations. */ | |
1671 | #define HAVE_COMPAT_IOCTL 1 | |
1672 | #define HAVE_UNLOCKED_IOCTL 1 | |
1673 | ||
b4caecd4 CH |
1674 | /* |
1675 | * These flags let !MMU mmap() govern direct device mapping vs immediate | |
1676 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. | |
1677 | * | |
1678 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) | |
1679 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) | |
1680 | * NOMMU_MAP_READ: Can be mapped for reading | |
1681 | * NOMMU_MAP_WRITE: Can be mapped for writing | |
1682 | * NOMMU_MAP_EXEC: Can be mapped for execution | |
1683 | */ | |
1684 | #define NOMMU_MAP_COPY 0x00000001 | |
1685 | #define NOMMU_MAP_DIRECT 0x00000008 | |
1686 | #define NOMMU_MAP_READ VM_MAYREAD | |
1687 | #define NOMMU_MAP_WRITE VM_MAYWRITE | |
1688 | #define NOMMU_MAP_EXEC VM_MAYEXEC | |
1689 | ||
1690 | #define NOMMU_VMFLAGS \ | |
1691 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) | |
1692 | ||
1693 | ||
293bc982 AV |
1694 | struct iov_iter; |
1695 | ||
1da177e4 LT |
1696 | struct file_operations { |
1697 | struct module *owner; | |
1698 | loff_t (*llseek) (struct file *, loff_t, int); | |
1699 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1700 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
293bc982 AV |
1701 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
1702 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); | |
bb6f619b | 1703 | int (*iterate) (struct file *, struct dir_context *); |
61922694 | 1704 | int (*iterate_shared) (struct file *, struct dir_context *); |
1da177e4 | 1705 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
1da177e4 LT |
1706 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1707 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1708 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1709 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1710 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1711 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1712 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1713 | int (*fasync) (int, struct file *, int); |
1714 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1715 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1716 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1717 | int (*check_flags)(int); | |
1da177e4 | 1718 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1719 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1720 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
e6f5c789 | 1721 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
2fe17c10 CH |
1722 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1723 | loff_t len); | |
a3816ab0 | 1724 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
b4caecd4 CH |
1725 | #ifndef CONFIG_MMU |
1726 | unsigned (*mmap_capabilities)(struct file *); | |
1727 | #endif | |
04b38d60 CH |
1728 | ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, |
1729 | loff_t, size_t, unsigned int); | |
1730 | int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t, | |
1731 | u64); | |
54dbc151 DW |
1732 | ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *, |
1733 | u64); | |
1da177e4 LT |
1734 | }; |
1735 | ||
1736 | struct inode_operations { | |
00cd8dd3 | 1737 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
fceef393 | 1738 | const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); |
10556cb2 | 1739 | int (*permission) (struct inode *, int); |
4e34e719 | 1740 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1741 | |
1742 | int (*readlink) (struct dentry *, char __user *,int); | |
44a7d7a8 | 1743 | |
ebfc3b49 | 1744 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1da177e4 LT |
1745 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1746 | int (*unlink) (struct inode *,struct dentry *); | |
1747 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1748 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1749 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1750 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 1751 | int (*rename) (struct inode *, struct dentry *, |
520c8b16 | 1752 | struct inode *, struct dentry *, unsigned int); |
1da177e4 LT |
1753 | int (*setattr) (struct dentry *, struct iattr *); |
1754 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); | |
1da177e4 | 1755 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
c4b929b8 MF |
1756 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1757 | u64 len); | |
c3b2da31 | 1758 | int (*update_time)(struct inode *, struct timespec *, int); |
d9585277 | 1759 | int (*atomic_open)(struct inode *, struct dentry *, |
30d90494 | 1760 | struct file *, unsigned open_flag, |
d9585277 | 1761 | umode_t create_mode, int *opened); |
60545d0d | 1762 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
893d46e4 | 1763 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
44a7d7a8 | 1764 | } ____cacheline_aligned; |
1da177e4 | 1765 | |
eed4e51f | 1766 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1767 | unsigned long nr_segs, unsigned long fast_segs, |
1768 | struct iovec *fast_pointer, | |
ac34ebb3 | 1769 | struct iovec **ret_pointer); |
eed4e51f | 1770 | |
6fb5032e | 1771 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); |
493c84c0 | 1772 | extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *); |
1da177e4 LT |
1773 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1774 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1775 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
793b80ef | 1776 | unsigned long, loff_t *, int); |
1da177e4 | 1777 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
793b80ef | 1778 | unsigned long, loff_t *, int); |
29732938 ZB |
1779 | extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, |
1780 | loff_t, size_t, unsigned int); | |
04b38d60 CH |
1781 | extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in, |
1782 | struct file *file_out, loff_t pos_out, u64 len); | |
54dbc151 DW |
1783 | extern int vfs_dedupe_file_range(struct file *file, |
1784 | struct file_dedupe_range *same); | |
1da177e4 | 1785 | |
1da177e4 LT |
1786 | struct super_operations { |
1787 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1788 | void (*destroy_inode)(struct inode *); | |
1789 | ||
aa385729 | 1790 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1791 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1792 | int (*drop_inode) (struct inode *); |
be7ce416 | 1793 | void (*evict_inode) (struct inode *); |
1da177e4 | 1794 | void (*put_super) (struct super_block *); |
1da177e4 | 1795 | int (*sync_fs)(struct super_block *sb, int wait); |
48b6bca6 | 1796 | int (*freeze_super) (struct super_block *); |
c4be0c1d | 1797 | int (*freeze_fs) (struct super_block *); |
48b6bca6 | 1798 | int (*thaw_super) (struct super_block *); |
c4be0c1d | 1799 | int (*unfreeze_fs) (struct super_block *); |
726c3342 | 1800 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1801 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1802 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1803 | |
34c80b1d | 1804 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1805 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1806 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1807 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1808 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1809 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1810 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
2d0fa467 | 1811 | struct dquot **(*get_dquots)(struct inode *); |
0e51a720 | 1812 | #endif |
87d8fe1e | 1813 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
4101b624 VD |
1814 | long (*nr_cached_objects)(struct super_block *, |
1815 | struct shrink_control *); | |
1816 | long (*free_cached_objects)(struct super_block *, | |
1817 | struct shrink_control *); | |
1da177e4 LT |
1818 | }; |
1819 | ||
bbc1096a DH |
1820 | /* |
1821 | * Inode flags - they have no relation to superblock flags now | |
1822 | */ | |
1823 | #define S_SYNC 1 /* Writes are synced at once */ | |
1824 | #define S_NOATIME 2 /* Do not update access times */ | |
1825 | #define S_APPEND 4 /* Append-only file */ | |
1826 | #define S_IMMUTABLE 8 /* Immutable file */ | |
1827 | #define S_DEAD 16 /* removed, but still open directory */ | |
1828 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
1829 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
1830 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
1831 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
1832 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
1833 | #define S_IMA 1024 /* Inode has an associated IMA struct */ | |
1834 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ | |
1835 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ | |
6cd176a5 | 1836 | #ifdef CONFIG_FS_DAX |
fbbbad4b MW |
1837 | #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
1838 | #else | |
1839 | #define S_DAX 0 /* Make all the DAX code disappear */ | |
1840 | #endif | |
bbc1096a DH |
1841 | |
1842 | /* | |
1843 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
1844 | * flags just means all the inodes inherit those flags by default. It might be | |
1845 | * possible to override it selectively if you really wanted to with some | |
1846 | * ioctl() that is not currently implemented. | |
1847 | * | |
1848 | * Exception: MS_RDONLY is always applied to the entire file system. | |
1849 | * | |
1850 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
1851 | * with files in use. This means that all of the inodes will not have their | |
1852 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
1853 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
1854 | */ | |
1855 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) | |
1856 | ||
1857 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) | |
1858 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ | |
1859 | ((inode)->i_flags & S_SYNC)) | |
1860 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ | |
1861 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) | |
1862 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) | |
1863 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) | |
1864 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) | |
1865 | ||
1866 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
1867 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
1868 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
1869 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) | |
1870 | ||
1871 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
1872 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
1873 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
1874 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
1875 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) | |
1876 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) | |
1877 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) | |
fbbbad4b | 1878 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
bbc1096a | 1879 | |
787fb6bc MS |
1880 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
1881 | (inode)->i_rdev == WHITEOUT_DEV) | |
1882 | ||
0bd23d09 EB |
1883 | static inline bool HAS_UNMAPPED_ID(struct inode *inode) |
1884 | { | |
1885 | return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid); | |
1886 | } | |
1887 | ||
1c0eeaf5 | 1888 | /* |
250df6ed | 1889 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
1890 | * |
1891 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1892 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1893 | * | |
1894 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1895 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1896 | * various stages of removing an inode. | |
1897 | * | |
eaff8079 | 1898 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 1899 | * |
e7ca2d41 JE |
1900 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1901 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
1902 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1903 | * these changes separately from I_DIRTY_SYNC so that we | |
1904 | * don't have to write inode on fdatasync() when only | |
1905 | * mtime has changed in it. | |
1c0eeaf5 | 1906 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
1907 | * I_NEW Serves as both a mutex and completion notification. |
1908 | * New inodes set I_NEW. If two processes both create | |
1909 | * the same inode, one of them will release its inode and | |
1910 | * wait for I_NEW to be released before returning. | |
1911 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1912 | * also cause waiting on I_NEW, without I_NEW actually | |
1913 | * being set. find_inode() uses this to prevent returning | |
1914 | * nearly-dead inodes. | |
1c0eeaf5 JE |
1915 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1916 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1917 | * cleared. | |
1918 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1919 | * pages or buffers attached or the inode itself is still | |
1920 | * dirty. | |
dbd5768f JK |
1921 | * I_CLEAR Added by clear_inode(). In this state the inode is |
1922 | * clean and can be destroyed. Inode keeps I_FREEING. | |
1c0eeaf5 JE |
1923 | * |
1924 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1925 | * prohibited for many purposes. iget() must wait for | |
1926 | * the inode to be completely released, then create it | |
1927 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 1928 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 1929 | * |
169ebd90 JK |
1930 | * I_SYNC Writeback of inode is running. The bit is set during |
1931 | * data writeback, and cleared with a wakeup on the bit | |
1932 | * address once it is done. The bit is also used to pin | |
1933 | * the inode in memory for flusher thread. | |
1c0eeaf5 | 1934 | * |
bd5fe6c5 CH |
1935 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1936 | * | |
1937 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
1938 | * | |
682aa8e1 TH |
1939 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
1940 | * synchronize competing switching instances and to tell | |
1941 | * wb stat updates to grab mapping->tree_lock. See | |
1942 | * inode_switch_wb_work_fn() for details. | |
1943 | * | |
1c0eeaf5 | 1944 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 1945 | */ |
9e38d86f NP |
1946 | #define I_DIRTY_SYNC (1 << 0) |
1947 | #define I_DIRTY_DATASYNC (1 << 1) | |
1948 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
1949 | #define __I_NEW 3 |
1950 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
1951 | #define I_WILL_FREE (1 << 4) |
1952 | #define I_FREEING (1 << 5) | |
1953 | #define I_CLEAR (1 << 6) | |
eaff8079 | 1954 | #define __I_SYNC 7 |
1c0eeaf5 | 1955 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 1956 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 | 1957 | #define __I_DIO_WAKEUP 9 |
ac74d8d6 | 1958 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
f4e0c30c | 1959 | #define I_LINKABLE (1 << 10) |
0ae45f63 TT |
1960 | #define I_DIRTY_TIME (1 << 11) |
1961 | #define __I_DIRTY_TIME_EXPIRED 12 | |
1962 | #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) | |
682aa8e1 | 1963 | #define I_WB_SWITCH (1 << 13) |
1da177e4 LT |
1964 | |
1965 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
0ae45f63 | 1966 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
1da177e4 LT |
1967 | |
1968 | extern void __mark_inode_dirty(struct inode *, int); | |
1969 | static inline void mark_inode_dirty(struct inode *inode) | |
1970 | { | |
1971 | __mark_inode_dirty(inode, I_DIRTY); | |
1972 | } | |
1973 | ||
1974 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
1975 | { | |
1976 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
1977 | } | |
1978 | ||
7ada4db8 MS |
1979 | extern void inc_nlink(struct inode *inode); |
1980 | extern void drop_nlink(struct inode *inode); | |
1981 | extern void clear_nlink(struct inode *inode); | |
1982 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
1983 | |
1984 | static inline void inode_inc_link_count(struct inode *inode) | |
1985 | { | |
1986 | inc_nlink(inode); | |
66d21730 AD |
1987 | mark_inode_dirty(inode); |
1988 | } | |
1989 | ||
9a53c3a7 DH |
1990 | static inline void inode_dec_link_count(struct inode *inode) |
1991 | { | |
1992 | drop_nlink(inode); | |
66d21730 AD |
1993 | mark_inode_dirty(inode); |
1994 | } | |
1995 | ||
25ec56b5 JNC |
1996 | /** |
1997 | * inode_inc_iversion - increments i_version | |
1998 | * @inode: inode that need to be updated | |
1999 | * | |
2000 | * Every time the inode is modified, the i_version field will be incremented. | |
2001 | * The filesystem has to be mounted with i_version flag | |
2002 | */ | |
2003 | ||
2004 | static inline void inode_inc_iversion(struct inode *inode) | |
2005 | { | |
2006 | spin_lock(&inode->i_lock); | |
2007 | inode->i_version++; | |
2008 | spin_unlock(&inode->i_lock); | |
2009 | } | |
2010 | ||
c3b2da31 JB |
2011 | enum file_time_flags { |
2012 | S_ATIME = 1, | |
2013 | S_MTIME = 2, | |
2014 | S_CTIME = 4, | |
2015 | S_VERSION = 8, | |
2016 | }; | |
2017 | ||
badcf2b7 | 2018 | extern void touch_atime(const struct path *); |
1da177e4 LT |
2019 | static inline void file_accessed(struct file *file) |
2020 | { | |
2021 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 2022 | touch_atime(&file->f_path); |
1da177e4 LT |
2023 | } |
2024 | ||
2025 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 2026 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 2027 | |
1da177e4 LT |
2028 | struct file_system_type { |
2029 | const char *name; | |
2030 | int fs_flags; | |
bbc1096a DH |
2031 | #define FS_REQUIRES_DEV 1 |
2032 | #define FS_BINARY_MOUNTDATA 2 | |
2033 | #define FS_HAS_SUBTYPE 4 | |
0c55cfc4 | 2034 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
bbc1096a | 2035 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
c96e41e9 AV |
2036 | struct dentry *(*mount) (struct file_system_type *, int, |
2037 | const char *, void *); | |
1da177e4 LT |
2038 | void (*kill_sb) (struct super_block *); |
2039 | struct module *owner; | |
2040 | struct file_system_type * next; | |
a5166169 | 2041 | struct hlist_head fs_supers; |
d475fd42 | 2042 | |
cf516249 | 2043 | struct lock_class_key s_lock_key; |
897c6ff9 | 2044 | struct lock_class_key s_umount_key; |
51ee049e | 2045 | struct lock_class_key s_vfs_rename_key; |
5accdf82 | 2046 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
d475fd42 PZ |
2047 | |
2048 | struct lock_class_key i_lock_key; | |
2049 | struct lock_class_key i_mutex_key; | |
14358e6d | 2050 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
2051 | }; |
2052 | ||
7f78e035 EB |
2053 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
2054 | ||
d91ee87d EB |
2055 | extern struct dentry *mount_ns(struct file_system_type *fs_type, |
2056 | int flags, void *data, void *ns, struct user_namespace *user_ns, | |
2057 | int (*fill_super)(struct super_block *, void *, int)); | |
152a0836 AV |
2058 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2059 | int flags, const char *dev_name, void *data, | |
2060 | int (*fill_super)(struct super_block *, void *, int)); | |
fc14f2fe AV |
2061 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2062 | int flags, void *data, | |
2063 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
2064 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2065 | int flags, void *data, | |
2066 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 2067 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 LT |
2068 | void generic_shutdown_super(struct super_block *sb); |
2069 | void kill_block_super(struct super_block *sb); | |
2070 | void kill_anon_super(struct super_block *sb); | |
2071 | void kill_litter_super(struct super_block *sb); | |
2072 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 2073 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 2074 | int set_anon_super(struct super_block *s, void *data); |
0ee5dc67 AV |
2075 | int get_anon_bdev(dev_t *); |
2076 | void free_anon_bdev(dev_t); | |
6e4eab57 EB |
2077 | struct super_block *sget_userns(struct file_system_type *type, |
2078 | int (*test)(struct super_block *,void *), | |
2079 | int (*set)(struct super_block *,void *), | |
2080 | int flags, struct user_namespace *user_ns, | |
2081 | void *data); | |
1da177e4 LT |
2082 | struct super_block *sget(struct file_system_type *type, |
2083 | int (*test)(struct super_block *,void *), | |
2084 | int (*set)(struct super_block *,void *), | |
9249e17f | 2085 | int flags, void *data); |
bba0bd31 AG |
2086 | extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *, |
2087 | const struct super_operations *ops, | |
2088 | const struct xattr_handler **xattr, | |
2089 | const struct dentry_operations *dops, | |
2090 | unsigned long); | |
2091 | ||
2092 | static inline struct dentry * | |
2093 | mount_pseudo(struct file_system_type *fs_type, char *name, | |
2094 | const struct super_operations *ops, | |
2095 | const struct dentry_operations *dops, unsigned long magic) | |
2096 | { | |
2097 | return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic); | |
2098 | } | |
1da177e4 LT |
2099 | |
2100 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
2101 | #define fops_get(fops) \ | |
2102 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
2103 | #define fops_put(fops) \ | |
2104 | do { if (fops) module_put((fops)->owner); } while(0) | |
e84f9e57 AV |
2105 | /* |
2106 | * This one is to be used *ONLY* from ->open() instances. | |
2107 | * fops must be non-NULL, pinned down *and* module dependencies | |
2108 | * should be sufficient to pin the caller down as well. | |
2109 | */ | |
2110 | #define replace_fops(f, fops) \ | |
2111 | do { \ | |
2112 | struct file *__file = (f); \ | |
2113 | fops_put(__file->f_op); \ | |
2114 | BUG_ON(!(__file->f_op = (fops))); \ | |
2115 | } while(0) | |
1da177e4 LT |
2116 | |
2117 | extern int register_filesystem(struct file_system_type *); | |
2118 | extern int unregister_filesystem(struct file_system_type *); | |
8bf9725c PE |
2119 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
2120 | #define kern_mount(type) kern_mount_data(type, NULL) | |
423e0ab0 | 2121 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
2122 | extern int may_umount_tree(struct vfsmount *); |
2123 | extern int may_umount(struct vfsmount *); | |
5e6123f3 SL |
2124 | extern long do_mount(const char *, const char __user *, |
2125 | const char *, unsigned long, void *); | |
589ff870 | 2126 | extern struct vfsmount *collect_mounts(struct path *); |
8aec0809 | 2127 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
2128 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
2129 | struct vfsmount *); | |
ebabe9a9 | 2130 | extern int vfs_statfs(struct path *, struct kstatfs *); |
c8b91acc AV |
2131 | extern int user_statfs(const char __user *, struct kstatfs *); |
2132 | extern int fd_statfs(int, struct kstatfs *); | |
cf31e70d | 2133 | extern int vfs_ustat(dev_t, struct kstatfs *); |
18e9e510 JB |
2134 | extern int freeze_super(struct super_block *super); |
2135 | extern int thaw_super(struct super_block *super); | |
02125a82 | 2136 | extern bool our_mnt(struct vfsmount *mnt); |
1da177e4 | 2137 | |
ce3b0f8d AV |
2138 | extern int current_umask(void); |
2139 | ||
5a14696c BF |
2140 | extern void ihold(struct inode * inode); |
2141 | extern void iput(struct inode *); | |
0ae45f63 | 2142 | extern int generic_update_time(struct inode *, struct timespec *, int); |
5a14696c | 2143 | |
f87fd4c2 | 2144 | /* /sys/fs */ |
00d26666 | 2145 | extern struct kobject *fs_kobj; |
f87fd4c2 | 2146 | |
09cbfeaf | 2147 | #define MAX_RW_COUNT (INT_MAX & PAGE_MASK) |
bfcd17a6 | 2148 | |
9e8925b6 | 2149 | #ifdef CONFIG_MANDATORY_FILE_LOCKING |
d7a06983 | 2150 | extern int locks_mandatory_locked(struct file *); |
acc15575 | 2151 | extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char); |
1da177e4 LT |
2152 | |
2153 | /* | |
2154 | * Candidates for mandatory locking have the setgid bit set | |
2155 | * but no group execute bit - an otherwise meaningless combination. | |
2156 | */ | |
a16877ca PE |
2157 | |
2158 | static inline int __mandatory_lock(struct inode *ino) | |
2159 | { | |
2160 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
2161 | } | |
2162 | ||
2163 | /* | |
2164 | * ... and these candidates should be on MS_MANDLOCK mounted fs, | |
2165 | * otherwise these will be advisory locks | |
2166 | */ | |
2167 | ||
2168 | static inline int mandatory_lock(struct inode *ino) | |
2169 | { | |
2170 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
2171 | } | |
1da177e4 | 2172 | |
d7a06983 | 2173 | static inline int locks_verify_locked(struct file *file) |
1da177e4 | 2174 | { |
c568d683 | 2175 | if (mandatory_lock(locks_inode(file))) |
d7a06983 | 2176 | return locks_mandatory_locked(file); |
1da177e4 LT |
2177 | return 0; |
2178 | } | |
2179 | ||
1da177e4 | 2180 | static inline int locks_verify_truncate(struct inode *inode, |
acc15575 | 2181 | struct file *f, |
1da177e4 LT |
2182 | loff_t size) |
2183 | { | |
acc15575 CH |
2184 | if (!inode->i_flctx || !mandatory_lock(inode)) |
2185 | return 0; | |
2186 | ||
2187 | if (size < inode->i_size) { | |
2188 | return locks_mandatory_area(inode, f, size, inode->i_size - 1, | |
2189 | F_WRLCK); | |
2190 | } else { | |
2191 | return locks_mandatory_area(inode, f, inode->i_size, size - 1, | |
2192 | F_WRLCK); | |
2193 | } | |
1da177e4 LT |
2194 | } |
2195 | ||
9e8925b6 JL |
2196 | #else /* !CONFIG_MANDATORY_FILE_LOCKING */ |
2197 | ||
2198 | static inline int locks_mandatory_locked(struct file *file) | |
2199 | { | |
2200 | return 0; | |
2201 | } | |
2202 | ||
fce205e9 LT |
2203 | static inline int locks_mandatory_area(struct inode *inode, struct file *filp, |
2204 | loff_t start, loff_t end, unsigned char type) | |
9e8925b6 JL |
2205 | { |
2206 | return 0; | |
2207 | } | |
2208 | ||
2209 | static inline int __mandatory_lock(struct inode *inode) | |
2210 | { | |
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | static inline int mandatory_lock(struct inode *inode) | |
2215 | { | |
2216 | return 0; | |
2217 | } | |
2218 | ||
2219 | static inline int locks_verify_locked(struct file *file) | |
2220 | { | |
2221 | return 0; | |
2222 | } | |
2223 | ||
2224 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
2225 | size_t size) | |
2226 | { | |
2227 | return 0; | |
2228 | } | |
2229 | ||
2230 | #endif /* CONFIG_MANDATORY_FILE_LOCKING */ | |
2231 | ||
2232 | ||
2233 | #ifdef CONFIG_FILE_LOCKING | |
1da177e4 LT |
2234 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2235 | { | |
24cbe784 JL |
2236 | /* |
2237 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2238 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2239 | * could end up racing with tasks trying to set a new lease on this | |
2240 | * file. | |
24cbe784 JL |
2241 | */ |
2242 | smp_mb(); | |
8634b51f | 2243 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2244 | return __break_lease(inode, mode, FL_LEASE); |
1da177e4 LT |
2245 | return 0; |
2246 | } | |
df4e8d2c BF |
2247 | |
2248 | static inline int break_deleg(struct inode *inode, unsigned int mode) | |
2249 | { | |
962bd40b JL |
2250 | /* |
2251 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2252 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2253 | * could end up racing with tasks trying to set a new lease on this | |
2254 | * file. | |
962bd40b JL |
2255 | */ |
2256 | smp_mb(); | |
8634b51f | 2257 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2258 | return __break_lease(inode, mode, FL_DELEG); |
1da177e4 LT |
2259 | return 0; |
2260 | } | |
df4e8d2c | 2261 | |
5a14696c BF |
2262 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2263 | { | |
2264 | int ret; | |
2265 | ||
2266 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); | |
2267 | if (ret == -EWOULDBLOCK && delegated_inode) { | |
2268 | *delegated_inode = inode; | |
2269 | ihold(inode); | |
2270 | } | |
2271 | return ret; | |
2272 | } | |
2273 | ||
2274 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2275 | { | |
2276 | int ret; | |
2277 | ||
2278 | ret = break_deleg(*delegated_inode, O_WRONLY); | |
2279 | iput(*delegated_inode); | |
2280 | *delegated_inode = NULL; | |
2281 | return ret; | |
2282 | } | |
2283 | ||
11afe9f7 CH |
2284 | static inline int break_layout(struct inode *inode, bool wait) |
2285 | { | |
2286 | smp_mb(); | |
2287 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) | |
2288 | return __break_lease(inode, | |
2289 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, | |
2290 | FL_LAYOUT); | |
2291 | return 0; | |
2292 | } | |
2293 | ||
bfcd17a6 | 2294 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
2295 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2296 | { | |
2297 | return 0; | |
2298 | } | |
2299 | ||
df4e8d2c BF |
2300 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2301 | { | |
2302 | return 0; | |
2303 | } | |
5a14696c BF |
2304 | |
2305 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) | |
2306 | { | |
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2311 | { | |
2312 | BUG(); | |
2313 | return 0; | |
2314 | } | |
2315 | ||
11afe9f7 CH |
2316 | static inline int break_layout(struct inode *inode, bool wait) |
2317 | { | |
2318 | return 0; | |
2319 | } | |
2320 | ||
bfcd17a6 | 2321 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2322 | |
2323 | /* fs/open.c */ | |
adb5c247 | 2324 | struct audit_names; |
91a27b2a | 2325 | struct filename { |
adb5c247 JL |
2326 | const char *name; /* pointer to actual string */ |
2327 | const __user char *uptr; /* original userland pointer */ | |
2328 | struct audit_names *aname; | |
55422d0b | 2329 | int refcnt; |
fd2f7cb5 | 2330 | const char iname[]; |
91a27b2a | 2331 | }; |
1da177e4 | 2332 | |
7df818b2 | 2333 | extern long vfs_truncate(const struct path *, loff_t); |
4a30131e N |
2334 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2335 | struct file *filp); | |
72c72bdf | 2336 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
3e63cbb1 | 2337 | loff_t len); |
8e8a1407 | 2338 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd | 2339 | umode_t mode); |
669abf4e | 2340 | extern struct file *file_open_name(struct filename *, int, umode_t); |
a218d0fd | 2341 | extern struct file *filp_open(const char *, int, umode_t); |
73d049a4 | 2342 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
378c6520 | 2343 | const char *, int, umode_t); |
765927b2 | 2344 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
1da177e4 | 2345 | extern int filp_close(struct file *, fl_owner_t id); |
91a27b2a | 2346 | |
51f39a1f | 2347 | extern struct filename *getname_flags(const char __user *, int, int *); |
91a27b2a | 2348 | extern struct filename *getname(const char __user *); |
c4ad8f98 | 2349 | extern struct filename *getname_kernel(const char *); |
55422d0b | 2350 | extern void putname(struct filename *name); |
91a27b2a | 2351 | |
47237687 AV |
2352 | enum { |
2353 | FILE_CREATED = 1, | |
2354 | FILE_OPENED = 2 | |
2355 | }; | |
30d90494 AV |
2356 | extern int finish_open(struct file *file, struct dentry *dentry, |
2357 | int (*open)(struct inode *, struct file *), | |
2358 | int *opened); | |
e45198a6 | 2359 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
1da177e4 | 2360 | |
3e63cbb1 AJ |
2361 | /* fs/ioctl.c */ |
2362 | ||
2363 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2364 | ||
1da177e4 LT |
2365 | /* fs/dcache.c */ |
2366 | extern void __init vfs_caches_init_early(void); | |
4248b0da | 2367 | extern void __init vfs_caches_init(void); |
1da177e4 | 2368 | |
b86c089b CL |
2369 | extern struct kmem_cache *names_cachep; |
2370 | ||
a608ca21 | 2371 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
3446a8aa | 2372 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1da177e4 | 2373 | |
9361401e | 2374 | #ifdef CONFIG_BLOCK |
1da177e4 | 2375 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2376 | extern void unregister_blkdev(unsigned int, const char *); |
1da177e4 | 2377 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2378 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 LT |
2379 | extern void bd_set_size(struct block_device *, loff_t size); |
2380 | extern void bd_forget(struct inode *inode); | |
2381 | extern void bdput(struct block_device *); | |
585d3bc0 | 2382 | extern void invalidate_bdev(struct block_device *); |
5c0d6b60 | 2383 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
585d3bc0 | 2384 | extern int sync_blockdev(struct block_device *bdev); |
ff01bb48 | 2385 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2386 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2387 | extern void emergency_thaw_all(void); |
585d3bc0 NP |
2388 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2389 | extern int fsync_bdev(struct block_device *); | |
a212b105 TH |
2390 | |
2391 | extern struct super_block *blockdev_superblock; | |
2392 | ||
2393 | static inline bool sb_is_blkdev_sb(struct super_block *sb) | |
2394 | { | |
2395 | return sb == blockdev_superblock; | |
2396 | } | |
9361401e DH |
2397 | #else |
2398 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2399 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2400 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2401 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2402 | ||
2403 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2404 | { | |
2405 | return NULL; | |
2406 | } | |
2407 | ||
2408 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2409 | { | |
2410 | return 0; | |
2411 | } | |
5c0d6b60 JK |
2412 | |
2413 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) | |
2414 | { | |
2415 | } | |
a8855990 | 2416 | |
3e004eea | 2417 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a8855990 | 2418 | { |
3e004eea | 2419 | return false; |
a8855990 | 2420 | } |
9361401e | 2421 | #endif |
60b0680f | 2422 | extern int sync_filesystem(struct super_block *); |
9361401e | 2423 | extern const struct file_operations def_blk_fops; |
4b6f5d20 | 2424 | extern const struct file_operations def_chr_fops; |
9361401e | 2425 | #ifdef CONFIG_BLOCK |
1da177e4 | 2426 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2427 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2428 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2429 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2430 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2431 | void *holder); | |
2432 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2433 | void *holder); | |
4385bab1 | 2434 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
be324177 JW |
2435 | extern int __blkdev_reread_part(struct block_device *bdev); |
2436 | extern int blkdev_reread_part(struct block_device *bdev); | |
2437 | ||
641dc636 | 2438 | #ifdef CONFIG_SYSFS |
e09b457b | 2439 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2440 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2441 | struct gendisk *disk); | |
641dc636 | 2442 | #else |
e09b457b TH |
2443 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2444 | struct gendisk *disk) | |
2445 | { | |
2446 | return 0; | |
2447 | } | |
49731baa TH |
2448 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2449 | struct gendisk *disk) | |
2450 | { | |
2451 | } | |
641dc636 | 2452 | #endif |
9361401e | 2453 | #endif |
1da177e4 LT |
2454 | |
2455 | /* fs/char_dev.c */ | |
68eef3b4 | 2456 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
49db08c3 LW |
2457 | /* Marks the bottom of the first segment of free char majors */ |
2458 | #define CHRDEV_MAJOR_DYN_END 234 | |
1da177e4 LT |
2459 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2460 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2461 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2462 | unsigned int count, const char *name, | |
2463 | const struct file_operations *fops); | |
2464 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2465 | unsigned int count, const char *name); | |
1da177e4 | 2466 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2467 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2468 | |
1905b1bf TH |
2469 | static inline int register_chrdev(unsigned int major, const char *name, |
2470 | const struct file_operations *fops) | |
2471 | { | |
2472 | return __register_chrdev(major, 0, 256, name, fops); | |
2473 | } | |
2474 | ||
2475 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2476 | { | |
2477 | __unregister_chrdev(major, 0, 256, name); | |
2478 | } | |
2479 | ||
1da177e4 LT |
2480 | /* fs/block_dev.c */ |
2481 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2482 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2483 | |
2484 | #ifdef CONFIG_BLOCK | |
2485 | #define BLKDEV_MAJOR_HASH_SIZE 255 | |
1da177e4 LT |
2486 | extern const char *__bdevname(dev_t, char *buffer); |
2487 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2488 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2489 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2490 | |
9361401e DH |
2491 | #else |
2492 | #define BLKDEV_MAJOR_HASH_SIZE 0 | |
2493 | #endif | |
1da177e4 LT |
2494 | |
2495 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2496 | ||
2497 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2498 | extern void make_bad_inode(struct inode *); | |
0e3ef1fe | 2499 | extern bool is_bad_inode(struct inode *); |
1da177e4 | 2500 | |
c11f0c0b | 2501 | #ifdef CONFIG_BLOCK |
4e1b2d52 | 2502 | static inline bool op_is_write(unsigned int op) |
f2150821 | 2503 | { |
4e1b2d52 | 2504 | return op == REQ_OP_READ ? false : true; |
f2150821 MC |
2505 | } |
2506 | ||
1da177e4 LT |
2507 | /* |
2508 | * return data direction, READ or WRITE | |
2509 | */ | |
f2150821 MC |
2510 | static inline int bio_data_dir(struct bio *bio) |
2511 | { | |
4e1b2d52 | 2512 | return op_is_write(bio_op(bio)) ? WRITE : READ; |
f2150821 | 2513 | } |
1da177e4 | 2514 | |
c3279d14 AP |
2515 | extern void check_disk_size_change(struct gendisk *disk, |
2516 | struct block_device *bdev); | |
0c002c2f | 2517 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2518 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2519 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2520 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2521 | #endif |
1da177e4 LT |
2522 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2523 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2524 | |
1da177e4 LT |
2525 | static inline void invalidate_remote_inode(struct inode *inode) |
2526 | { | |
2527 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2528 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2529 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2530 | } |
2531 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2532 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2533 | pgoff_t start, pgoff_t end); | |
2534 | extern int write_inode_now(struct inode *, int); | |
2535 | extern int filemap_fdatawrite(struct address_space *); | |
2536 | extern int filemap_flush(struct address_space *); | |
2537 | extern int filemap_fdatawait(struct address_space *); | |
aa750fd7 | 2538 | extern void filemap_fdatawait_keep_errors(struct address_space *); |
d3bccb6f JK |
2539 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2540 | loff_t lend); | |
1da177e4 LT |
2541 | extern int filemap_write_and_wait(struct address_space *mapping); |
2542 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2543 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2544 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2545 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2546 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2547 | loff_t start, loff_t end); | |
d72d9e2a | 2548 | extern int filemap_check_errors(struct address_space *mapping); |
ebcf28e1 | 2549 | |
8018ab05 CH |
2550 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2551 | int datasync); | |
2552 | extern int vfs_fsync(struct file *file, int datasync); | |
e2592217 CH |
2553 | |
2554 | /* | |
2555 | * Sync the bytes written if this was a synchronous write. Expect ki_pos | |
2556 | * to already be updated for the write, and will return either the amount | |
2557 | * of bytes passed in, or an error if syncing the file failed. | |
2558 | */ | |
2559 | static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) | |
2560 | { | |
2561 | if (iocb->ki_flags & IOCB_DSYNC) { | |
2562 | int ret = vfs_fsync_range(iocb->ki_filp, | |
2563 | iocb->ki_pos - count, iocb->ki_pos - 1, | |
2564 | (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); | |
2565 | if (ret) | |
2566 | return ret; | |
2567 | } | |
2568 | ||
2569 | return count; | |
d311d79d | 2570 | } |
e2592217 | 2571 | |
1da177e4 LT |
2572 | extern void emergency_sync(void); |
2573 | extern void emergency_remount(void); | |
9361401e | 2574 | #ifdef CONFIG_BLOCK |
1da177e4 | 2575 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2576 | #endif |
27ac0ffe | 2577 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
f419a2e3 | 2578 | extern int inode_permission(struct inode *, int); |
bd5d0856 | 2579 | extern int __inode_permission(struct inode *, int); |
2830ba7f | 2580 | extern int generic_permission(struct inode *, int); |
cbdf35bc | 2581 | extern int __check_sticky(struct inode *dir, struct inode *inode); |
1da177e4 | 2582 | |
f696a365 MS |
2583 | static inline bool execute_ok(struct inode *inode) |
2584 | { | |
2585 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2586 | } | |
2587 | ||
8d71db4f AV |
2588 | static inline void file_start_write(struct file *file) |
2589 | { | |
2590 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2591 | return; | |
2592 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); | |
2593 | } | |
2594 | ||
5ae98f15 JK |
2595 | static inline bool file_start_write_trylock(struct file *file) |
2596 | { | |
2597 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2598 | return true; | |
2599 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); | |
2600 | } | |
2601 | ||
8d71db4f AV |
2602 | static inline void file_end_write(struct file *file) |
2603 | { | |
2604 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2605 | return; | |
2606 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); | |
2607 | } | |
2608 | ||
07b8ce1e AV |
2609 | /* |
2610 | * get_write_access() gets write permission for a file. | |
2611 | * put_write_access() releases this write permission. | |
2612 | * This is used for regular files. | |
2613 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2614 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2615 | * can have the following values: | |
2616 | * 0: no writers, no VM_DENYWRITE mappings | |
2617 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2618 | * > 0: (i_writecount) users are writing to the file. | |
2619 | * | |
2620 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2621 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2622 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2623 | * to do the change if sign is wrong. | |
2624 | */ | |
2625 | static inline int get_write_access(struct inode *inode) | |
2626 | { | |
2627 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2628 | } | |
2629 | static inline int deny_write_access(struct file *file) | |
2630 | { | |
496ad9aa | 2631 | struct inode *inode = file_inode(file); |
07b8ce1e AV |
2632 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2633 | } | |
1da177e4 LT |
2634 | static inline void put_write_access(struct inode * inode) |
2635 | { | |
2636 | atomic_dec(&inode->i_writecount); | |
2637 | } | |
2638 | static inline void allow_write_access(struct file *file) | |
2639 | { | |
2640 | if (file) | |
496ad9aa | 2641 | atomic_inc(&file_inode(file)->i_writecount); |
1da177e4 | 2642 | } |
f1fe29b4 DH |
2643 | static inline bool inode_is_open_for_write(const struct inode *inode) |
2644 | { | |
2645 | return atomic_read(&inode->i_writecount) > 0; | |
2646 | } | |
2647 | ||
a5c96ebf MZ |
2648 | #ifdef CONFIG_IMA |
2649 | static inline void i_readcount_dec(struct inode *inode) | |
2650 | { | |
2651 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2652 | atomic_dec(&inode->i_readcount); | |
2653 | } | |
2654 | static inline void i_readcount_inc(struct inode *inode) | |
2655 | { | |
2656 | atomic_inc(&inode->i_readcount); | |
2657 | } | |
2658 | #else | |
2659 | static inline void i_readcount_dec(struct inode *inode) | |
2660 | { | |
2661 | return; | |
2662 | } | |
2663 | static inline void i_readcount_inc(struct inode *inode) | |
2664 | { | |
2665 | return; | |
2666 | } | |
2667 | #endif | |
ed8cae8b | 2668 | extern int do_pipe_flags(int *, int); |
1da177e4 | 2669 | |
1284ab5b MZ |
2670 | #define __kernel_read_file_id(id) \ |
2671 | id(UNKNOWN, unknown) \ | |
2672 | id(FIRMWARE, firmware) \ | |
a098ecd2 | 2673 | id(FIRMWARE_PREALLOC_BUFFER, firmware) \ |
1284ab5b MZ |
2674 | id(MODULE, kernel-module) \ |
2675 | id(KEXEC_IMAGE, kexec-image) \ | |
2676 | id(KEXEC_INITRAMFS, kexec-initramfs) \ | |
2677 | id(POLICY, security-policy) \ | |
2678 | id(MAX_ID, ) | |
2679 | ||
2680 | #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, | |
2681 | #define __fid_stringify(dummy, str) #str, | |
2682 | ||
bc8ca5b9 | 2683 | enum kernel_read_file_id { |
1284ab5b MZ |
2684 | __kernel_read_file_id(__fid_enumify) |
2685 | }; | |
2686 | ||
2687 | static const char * const kernel_read_file_str[] = { | |
2688 | __kernel_read_file_id(__fid_stringify) | |
bc8ca5b9 MZ |
2689 | }; |
2690 | ||
da20dfe6 | 2691 | static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) |
1284ab5b MZ |
2692 | { |
2693 | if (id < 0 || id >= READING_MAX_ID) | |
2694 | return kernel_read_file_str[READING_UNKNOWN]; | |
2695 | ||
2696 | return kernel_read_file_str[id]; | |
2697 | } | |
2698 | ||
6777d773 | 2699 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
bc8ca5b9 MZ |
2700 | extern int kernel_read_file(struct file *, void **, loff_t *, loff_t, |
2701 | enum kernel_read_file_id); | |
09596b94 MZ |
2702 | extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t, |
2703 | enum kernel_read_file_id); | |
b844f0ec MZ |
2704 | extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t, |
2705 | enum kernel_read_file_id); | |
7bb307e8 | 2706 | extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); |
ed44724b | 2707 | extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *); |
1da177e4 LT |
2708 | extern struct file * open_exec(const char *); |
2709 | ||
2710 | /* fs/dcache.c -- generic fs support functions */ | |
a6e5787f | 2711 | extern bool is_subdir(struct dentry *, struct dentry *); |
25ab4c9b | 2712 | extern bool path_is_under(struct path *, struct path *); |
1da177e4 | 2713 | |
9bf39ab2 MS |
2714 | extern char *file_path(struct file *, char *, int); |
2715 | ||
1da177e4 LT |
2716 | #include <linux/err.h> |
2717 | ||
2718 | /* needed for stackable file system support */ | |
965c8e59 | 2719 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2720 | |
965c8e59 | 2721 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2722 | |
54e34621 | 2723 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2724 | extern void inode_init_once(struct inode *); |
2aa15890 | 2725 | extern void address_space_init_once(struct address_space *mapping); |
1da177e4 LT |
2726 | extern struct inode * igrab(struct inode *); |
2727 | extern ino_t iunique(struct super_block *, ino_t); | |
2728 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2729 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2730 | static inline int generic_drop_inode(struct inode *inode) |
2731 | { | |
2732 | return !inode->i_nlink || inode_unhashed(inode); | |
2733 | } | |
1da177e4 | 2734 | |
88bd5121 AA |
2735 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2736 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2737 | void *data); | |
1da177e4 LT |
2738 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2739 | int (*test)(struct inode *, void *), void *data); | |
2740 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2741 | ||
2742 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
2743 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
fe032c42 TT |
2744 | extern struct inode *find_inode_nowait(struct super_block *, |
2745 | unsigned long, | |
2746 | int (*match)(struct inode *, | |
2747 | unsigned long, void *), | |
2748 | void *data); | |
261bca86 AV |
2749 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2750 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
2751 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2752 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
2753 | #else | |
2754 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
2755 | #endif | |
1da177e4 | 2756 | extern void unlock_new_inode(struct inode *); |
85fe4025 | 2757 | extern unsigned int get_next_ino(void); |
1da177e4 | 2758 | |
1da177e4 | 2759 | extern void __iget(struct inode * inode); |
b46980fe | 2760 | extern void iget_failed(struct inode *); |
dbd5768f | 2761 | extern void clear_inode(struct inode *); |
2e00c97e | 2762 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
2763 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2764 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 2765 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 2766 | extern int should_remove_suid(struct dentry *); |
5fa8e0a1 | 2767 | extern int file_remove_privs(struct file *); |
1da177e4 LT |
2768 | |
2769 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
2770 | static inline void insert_inode_hash(struct inode *inode) |
2771 | { | |
1da177e4 LT |
2772 | __insert_inode_hash(inode, inode->i_ino); |
2773 | } | |
f2ee7abf ED |
2774 | |
2775 | extern void __remove_inode_hash(struct inode *); | |
2776 | static inline void remove_inode_hash(struct inode *inode) | |
2777 | { | |
cbedaac6 | 2778 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
f2ee7abf ED |
2779 | __remove_inode_hash(inode); |
2780 | } | |
2781 | ||
646ec461 | 2782 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 2783 | |
9361401e | 2784 | #ifdef CONFIG_BLOCK |
4e49ea4a | 2785 | extern blk_qc_t submit_bio(struct bio *); |
1da177e4 | 2786 | extern int bdev_read_only(struct block_device *); |
9361401e | 2787 | #endif |
1da177e4 LT |
2788 | extern int set_blocksize(struct block_device *, int); |
2789 | extern int sb_set_blocksize(struct super_block *, int); | |
2790 | extern int sb_min_blocksize(struct super_block *, int); | |
2791 | ||
2792 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
2793 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
3309dd04 | 2794 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
ed978a81 | 2795 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2796 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2797 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
1af5bb49 | 2798 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *); |
3b93f911 | 2799 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
88e6faef | 2800 | |
dbe4e192 CH |
2801 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos); |
2802 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos); | |
2803 | ||
eef99380 | 2804 | /* fs/block_dev.c */ |
b2de525f | 2805 | extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
1456c0a8 | 2806 | extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
02c24a82 JB |
2807 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2808 | int datasync); | |
ff01bb48 | 2809 | extern void block_sync_page(struct page *page); |
eef99380 | 2810 | |
88e6faef | 2811 | /* fs/splice.c */ |
cbb7e577 | 2812 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 2813 | struct pipe_inode_info *, size_t, unsigned int); |
8d020765 | 2814 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 2815 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 2816 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 | 2817 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1c118596 MS |
2818 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
2819 | loff_t *opos, size_t len, unsigned int flags); | |
2820 | ||
88e6faef | 2821 | |
1da177e4 LT |
2822 | extern void |
2823 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
965c8e59 AM |
2824 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
2825 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); | |
46a1c2c7 | 2826 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
965c8e59 | 2827 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
5760495a | 2828 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
965c8e59 | 2829 | int whence, loff_t maxsize, loff_t eof); |
1bf9d14d AV |
2830 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
2831 | int whence, loff_t size); | |
b25472f9 AV |
2832 | extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t); |
2833 | extern loff_t no_seek_end_llseek(struct file *, loff_t, int); | |
1da177e4 LT |
2834 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2835 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
2836 | ||
9361401e | 2837 | #ifdef CONFIG_BLOCK |
8a4c1e42 | 2838 | typedef void (dio_submit_t)(struct bio *bio, struct inode *inode, |
facd07b0 | 2839 | loff_t file_offset); |
1da177e4 LT |
2840 | |
2841 | enum { | |
1e431f5c CH |
2842 | /* need locking between buffered and direct access */ |
2843 | DIO_LOCKING = 0x01, | |
2844 | ||
2845 | /* filesystem does not support filling holes */ | |
2846 | DIO_SKIP_HOLES = 0x02, | |
60392573 CH |
2847 | |
2848 | /* filesystem can handle aio writes beyond i_size */ | |
2849 | DIO_ASYNC_EXTEND = 0x04, | |
fe0f07d0 JA |
2850 | |
2851 | /* inode/fs/bdev does not need truncate protection */ | |
2852 | DIO_SKIP_DIO_COUNT = 0x08, | |
1da177e4 LT |
2853 | }; |
2854 | ||
eafdc7d1 CH |
2855 | void dio_end_io(struct bio *bio, int error); |
2856 | ||
17f8c842 OS |
2857 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
2858 | struct block_device *bdev, struct iov_iter *iter, | |
c8b8e32d | 2859 | get_block_t get_block, |
17f8c842 OS |
2860 | dio_iodone_t end_io, dio_submit_t submit_io, |
2861 | int flags); | |
7bb46a67 | 2862 | |
17f8c842 OS |
2863 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
2864 | struct inode *inode, | |
c8b8e32d | 2865 | struct iov_iter *iter, |
17f8c842 | 2866 | get_block_t get_block) |
1da177e4 | 2867 | { |
17f8c842 | 2868 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 2869 | get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 2870 | } |
9361401e | 2871 | #endif |
1da177e4 | 2872 | |
1d59d61f | 2873 | void inode_dio_wait(struct inode *inode); |
fe0f07d0 JA |
2874 | |
2875 | /* | |
2876 | * inode_dio_begin - signal start of a direct I/O requests | |
2877 | * @inode: inode the direct I/O happens on | |
2878 | * | |
2879 | * This is called once we've finished processing a direct I/O request, | |
2880 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
2881 | */ | |
2882 | static inline void inode_dio_begin(struct inode *inode) | |
2883 | { | |
2884 | atomic_inc(&inode->i_dio_count); | |
2885 | } | |
2886 | ||
2887 | /* | |
2888 | * inode_dio_end - signal finish of a direct I/O requests | |
2889 | * @inode: inode the direct I/O happens on | |
2890 | * | |
2891 | * This is called once we've finished processing a direct I/O request, | |
2892 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
2893 | */ | |
2894 | static inline void inode_dio_end(struct inode *inode) | |
2895 | { | |
2896 | if (atomic_dec_and_test(&inode->i_dio_count)) | |
2897 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); | |
2898 | } | |
1d59d61f | 2899 | |
5f16f322 TT |
2900 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
2901 | unsigned int mask); | |
2902 | ||
4b6f5d20 | 2903 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
2904 | |
2905 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
2906 | ||
5d826c84 | 2907 | extern int readlink_copy(char __user *, int, const char *); |
1da177e4 | 2908 | extern int page_readlink(struct dentry *, char __user *, int); |
fceef393 AV |
2909 | extern const char *page_get_link(struct dentry *, struct inode *, |
2910 | struct delayed_call *); | |
2911 | extern void page_put_link(void *); | |
0adb25d2 | 2912 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 2913 | int nofs); |
1da177e4 | 2914 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 2915 | extern const struct inode_operations page_symlink_inode_operations; |
fceef393 | 2916 | extern void kfree_link(void *); |
1da177e4 LT |
2917 | extern int generic_readlink(struct dentry *, char __user *, int); |
2918 | extern void generic_fillattr(struct inode *, struct kstat *); | |
b7a6ec52 | 2919 | int vfs_getattr_nosec(struct path *path, struct kstat *stat); |
3dadecce | 2920 | extern int vfs_getattr(struct path *, struct kstat *); |
b462707e | 2921 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 2922 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
1c8924eb | 2923 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
1da177e4 LT |
2924 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
2925 | loff_t inode_get_bytes(struct inode *inode); | |
2926 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
fceef393 AV |
2927 | const char *simple_get_link(struct dentry *, struct inode *, |
2928 | struct delayed_call *); | |
61ba64fc | 2929 | extern const struct inode_operations simple_symlink_inode_operations; |
1da177e4 | 2930 | |
5c0ba4e0 | 2931 | extern int iterate_dir(struct file *, struct dir_context *); |
1da177e4 | 2932 | |
c7887325 DH |
2933 | extern int vfs_stat(const char __user *, struct kstat *); |
2934 | extern int vfs_lstat(const char __user *, struct kstat *); | |
1da177e4 | 2935 | extern int vfs_fstat(unsigned int, struct kstat *); |
c7887325 | 2936 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
d60874cd | 2937 | extern const char *vfs_get_link(struct dentry *, struct delayed_call *); |
1da177e4 | 2938 | |
e9079cce | 2939 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
2940 | struct fiemap_extent_info *fieinfo, |
2941 | loff_t start, loff_t len, | |
2942 | get_block_t *get_block); | |
68c9d702 JB |
2943 | extern int generic_block_fiemap(struct inode *inode, |
2944 | struct fiemap_extent_info *fieinfo, u64 start, | |
2945 | u64 len, get_block_t *get_block); | |
1da177e4 | 2946 | |
c18479fe MS |
2947 | extern void get_filesystem(struct file_system_type *fs); |
2948 | extern void put_filesystem(struct file_system_type *fs); | |
1da177e4 LT |
2949 | extern struct file_system_type *get_fs_type(const char *name); |
2950 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 2951 | extern struct super_block *get_super_thawed(struct block_device *); |
4504230a | 2952 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 2953 | extern void drop_super(struct super_block *sb); |
01a05b33 | 2954 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
2955 | extern void iterate_supers_type(struct file_system_type *, |
2956 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
2957 | |
2958 | extern int dcache_dir_open(struct inode *, struct file *); | |
2959 | extern int dcache_dir_close(struct inode *, struct file *); | |
2960 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
5f99f4e7 | 2961 | extern int dcache_readdir(struct file *, struct dir_context *); |
7bb46a67 | 2962 | extern int simple_setattr(struct dentry *, struct iattr *); |
1da177e4 | 2963 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
726c3342 | 2964 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
20955e89 | 2965 | extern int simple_open(struct inode *inode, struct file *file); |
1da177e4 LT |
2966 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
2967 | extern int simple_unlink(struct inode *, struct dentry *); | |
2968 | extern int simple_rmdir(struct inode *, struct dentry *); | |
e0e0be8a MS |
2969 | extern int simple_rename(struct inode *, struct dentry *, |
2970 | struct inode *, struct dentry *, unsigned int); | |
02c24a82 | 2971 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
2972 | extern int simple_empty(struct dentry *); |
2973 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
2974 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
2975 | loff_t pos, unsigned len, unsigned flags, | |
2976 | struct page **pagep, void **fsdata); | |
2977 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
2978 | loff_t pos, unsigned len, unsigned copied, | |
2979 | struct page *page, void *fsdata); | |
b26d4cd3 | 2980 | extern int always_delete_dentry(const struct dentry *); |
6987843f | 2981 | extern struct inode *alloc_anon_inode(struct super_block *); |
e6f5c789 | 2982 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
b26d4cd3 | 2983 | extern const struct dentry_operations simple_dentry_operations; |
1da177e4 | 2984 | |
00cd8dd3 | 2985 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
1da177e4 | 2986 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
4b6f5d20 | 2987 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 2988 | extern const struct inode_operations simple_dir_inode_operations; |
fbabfd0f EB |
2989 | extern void make_empty_dir_inode(struct inode *inode); |
2990 | extern bool is_empty_dir_inode(struct inode *inode); | |
4b6f5d20 | 2991 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 2992 | struct dentry *d_alloc_name(struct dentry *, const char *); |
7d683a09 | 2993 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
1f5ce9e9 | 2994 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
2995 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
2996 | ||
93b07113 AM |
2997 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
2998 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
2999 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
3000 | const void __user *from, size_t count); | |
1da177e4 | 3001 | |
ac13a829 | 3002 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
02c24a82 | 3003 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 3004 | |
30ca22c7 PL |
3005 | extern int generic_check_addressable(unsigned, u64); |
3006 | ||
e965f963 | 3007 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 3008 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
3009 | struct page *, struct page *, |
3010 | enum migrate_mode); | |
e965f963 CL |
3011 | #else |
3012 | #define buffer_migrate_page NULL | |
3013 | #endif | |
3014 | ||
31051c85 | 3015 | extern int setattr_prepare(struct dentry *, struct iattr *); |
25d9e2d1 | 3016 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
6a1a90ad | 3017 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 3018 | |
c3b2da31 | 3019 | extern int file_update_time(struct file *file); |
1da177e4 | 3020 | |
34c80b1d | 3021 | extern int generic_show_options(struct seq_file *m, struct dentry *root); |
b3b304a2 | 3022 | extern void save_mount_options(struct super_block *sb, char *options); |
2a32cebd | 3023 | extern void replace_mount_options(struct super_block *sb, char *options); |
b3b304a2 | 3024 | |
d475c634 MW |
3025 | static inline bool io_is_direct(struct file *filp) |
3026 | { | |
65f87ee7 | 3027 | return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host); |
d475c634 MW |
3028 | } |
3029 | ||
2ba48ce5 AV |
3030 | static inline int iocb_flags(struct file *file) |
3031 | { | |
3032 | int res = 0; | |
3033 | if (file->f_flags & O_APPEND) | |
3034 | res |= IOCB_APPEND; | |
3035 | if (io_is_direct(file)) | |
3036 | res |= IOCB_DIRECT; | |
dde0c2e7 CH |
3037 | if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) |
3038 | res |= IOCB_DSYNC; | |
3039 | if (file->f_flags & __O_SYNC) | |
3040 | res |= IOCB_SYNC; | |
2ba48ce5 AV |
3041 | return res; |
3042 | } | |
3043 | ||
1da177e4 LT |
3044 | static inline ino_t parent_ino(struct dentry *dentry) |
3045 | { | |
3046 | ino_t res; | |
3047 | ||
b5c84bf6 NP |
3048 | /* |
3049 | * Don't strictly need d_lock here? If the parent ino could change | |
3050 | * then surely we'd have a deeper race in the caller? | |
3051 | */ | |
1da177e4 LT |
3052 | spin_lock(&dentry->d_lock); |
3053 | res = dentry->d_parent->d_inode->i_ino; | |
3054 | spin_unlock(&dentry->d_lock); | |
3055 | return res; | |
3056 | } | |
3057 | ||
1da177e4 LT |
3058 | /* Transaction based IO helpers */ |
3059 | ||
3060 | /* | |
3061 | * An argresp is stored in an allocated page and holds the | |
3062 | * size of the argument or response, along with its content | |
3063 | */ | |
3064 | struct simple_transaction_argresp { | |
3065 | ssize_t size; | |
3066 | char data[0]; | |
3067 | }; | |
3068 | ||
3069 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
3070 | ||
3071 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
3072 | size_t size); | |
3073 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
3074 | size_t size, loff_t *pos); | |
3075 | int simple_transaction_release(struct inode *inode, struct file *file); | |
3076 | ||
76791ab2 | 3077 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 3078 | |
acaefc25 AB |
3079 | /* |
3080 | * simple attribute files | |
3081 | * | |
3082 | * These attributes behave similar to those in sysfs: | |
3083 | * | |
3084 | * Writing to an attribute immediately sets a value, an open file can be | |
3085 | * written to multiple times. | |
3086 | * | |
3087 | * Reading from an attribute creates a buffer from the value that might get | |
3088 | * read with multiple read calls. When the attribute has been read | |
3089 | * completely, no further read calls are possible until the file is opened | |
3090 | * again. | |
3091 | * | |
3092 | * All attributes contain a text representation of a numeric value | |
3093 | * that are accessed with the get() and set() functions. | |
3094 | */ | |
3095 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
3096 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
3097 | { \ | |
3098 | __simple_attr_check_format(__fmt, 0ull); \ | |
3099 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
3100 | } \ | |
828c0950 | 3101 | static const struct file_operations __fops = { \ |
acaefc25 AB |
3102 | .owner = THIS_MODULE, \ |
3103 | .open = __fops ## _open, \ | |
74bedc4d | 3104 | .release = simple_attr_release, \ |
acaefc25 AB |
3105 | .read = simple_attr_read, \ |
3106 | .write = simple_attr_write, \ | |
1ec5584e | 3107 | .llseek = generic_file_llseek, \ |
68be3029 | 3108 | } |
acaefc25 | 3109 | |
b9075fa9 JP |
3110 | static inline __printf(1, 2) |
3111 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
3112 | { |
3113 | /* don't do anything, just let the compiler check the arguments; */ | |
3114 | } | |
3115 | ||
3116 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 3117 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 3118 | const char *fmt); |
74bedc4d | 3119 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
3120 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
3121 | size_t len, loff_t *ppos); | |
3122 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
3123 | size_t len, loff_t *ppos); | |
3124 | ||
4be28540 | 3125 | struct ctl_table; |
8d65af78 | 3126 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 3127 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
3128 | int proc_nr_dentry(struct ctl_table *table, int write, |
3129 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
3130 | int proc_nr_inodes(struct ctl_table *table, int write, |
3131 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 3132 | int __init get_filesystem_list(char *buf); |
62239ac2 | 3133 | |
3cd90ea4 | 3134 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
3135 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
3136 | ||
6d125529 | 3137 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 3138 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 3139 | (flag & __FMODE_NONOTIFY))) |
5300990c | 3140 | |
d37177ba | 3141 | static inline bool is_sxid(umode_t mode) |
69b45732 AK |
3142 | { |
3143 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
3144 | } | |
3145 | ||
cbdf35bc MS |
3146 | static inline int check_sticky(struct inode *dir, struct inode *inode) |
3147 | { | |
3148 | if (!(dir->i_mode & S_ISVTX)) | |
3149 | return 0; | |
3150 | ||
3151 | return __check_sticky(dir, inode); | |
3152 | } | |
3153 | ||
69b45732 AK |
3154 | static inline void inode_has_no_xattr(struct inode *inode) |
3155 | { | |
9e1f1de0 | 3156 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
69b45732 AK |
3157 | inode->i_flags |= S_NOSEC; |
3158 | } | |
3159 | ||
a7400222 AV |
3160 | static inline bool is_root_inode(struct inode *inode) |
3161 | { | |
3162 | return inode == inode->i_sb->s_root->d_inode; | |
3163 | } | |
3164 | ||
5f99f4e7 AV |
3165 | static inline bool dir_emit(struct dir_context *ctx, |
3166 | const char *name, int namelen, | |
3167 | u64 ino, unsigned type) | |
3168 | { | |
3169 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; | |
3170 | } | |
3171 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) | |
3172 | { | |
3173 | return ctx->actor(ctx, ".", 1, ctx->pos, | |
3174 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; | |
3175 | } | |
3176 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) | |
3177 | { | |
3178 | return ctx->actor(ctx, "..", 2, ctx->pos, | |
3179 | parent_ino(file->f_path.dentry), DT_DIR) == 0; | |
3180 | } | |
3181 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) | |
3182 | { | |
3183 | if (ctx->pos == 0) { | |
3184 | if (!dir_emit_dot(file, ctx)) | |
3185 | return false; | |
3186 | ctx->pos = 1; | |
3187 | } | |
3188 | if (ctx->pos == 1) { | |
3189 | if (!dir_emit_dotdot(file, ctx)) | |
3190 | return false; | |
3191 | ctx->pos = 2; | |
3192 | } | |
3193 | return true; | |
3194 | } | |
5ded75ec AV |
3195 | static inline bool dir_relax(struct inode *inode) |
3196 | { | |
5955102c AV |
3197 | inode_unlock(inode); |
3198 | inode_lock(inode); | |
5ded75ec AV |
3199 | return !IS_DEADDIR(inode); |
3200 | } | |
5f99f4e7 | 3201 | |
ae05327a AV |
3202 | static inline bool dir_relax_shared(struct inode *inode) |
3203 | { | |
3204 | inode_unlock_shared(inode); | |
3205 | inode_lock_shared(inode); | |
3206 | return !IS_DEADDIR(inode); | |
3207 | } | |
3208 | ||
90f8572b | 3209 | extern bool path_noexec(const struct path *path); |
21fc61c7 | 3210 | extern void inode_nohighmem(struct inode *inode); |
90f8572b | 3211 | |
1da177e4 | 3212 | #endif /* _LINUX_FS_H */ |