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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_FS_H |
3 | #define _LINUX_FS_H | |
4 | ||
1da177e4 | 5 | #include <linux/linkage.h> |
5dd43ce2 | 6 | #include <linux/wait_bit.h> |
1da177e4 LT |
7 | #include <linux/kdev_t.h> |
8 | #include <linux/dcache.h> | |
3f8206d4 | 9 | #include <linux/path.h> |
1da177e4 LT |
10 | #include <linux/stat.h> |
11 | #include <linux/cache.h> | |
1da177e4 | 12 | #include <linux/list.h> |
bc3b14cb | 13 | #include <linux/list_lru.h> |
4f5e65a1 | 14 | #include <linux/llist.h> |
1da177e4 | 15 | #include <linux/radix-tree.h> |
6b2dbba8 | 16 | #include <linux/rbtree.h> |
1da177e4 | 17 | #include <linux/init.h> |
914e2637 | 18 | #include <linux/pid.h> |
187f1882 | 19 | #include <linux/bug.h> |
1b1dcc1b | 20 | #include <linux/mutex.h> |
c8c06efa | 21 | #include <linux/rwsem.h> |
baabda26 | 22 | #include <linux/mm_types.h> |
3bd858ab | 23 | #include <linux/capability.h> |
6188e10d | 24 | #include <linux/semaphore.h> |
c75b1d94 | 25 | #include <linux/fcntl.h> |
c4b929b8 | 26 | #include <linux/fiemap.h> |
ceb5bdc2 | 27 | #include <linux/rculist_bl.h> |
07b8ce1e | 28 | #include <linux/atomic.h> |
83aeeada | 29 | #include <linux/shrinker.h> |
c1aab02d | 30 | #include <linux/migrate_mode.h> |
92361636 | 31 | #include <linux/uidgid.h> |
5accdf82 | 32 | #include <linux/lockdep.h> |
c2b1ad80 | 33 | #include <linux/percpu-rwsem.h> |
853b39a7 | 34 | #include <linux/workqueue.h> |
fceef393 | 35 | #include <linux/delayed_call.h> |
85787090 | 36 | #include <linux/uuid.h> |
5660e13d | 37 | #include <linux/errseq.h> |
1da177e4 | 38 | |
1da177e4 | 39 | #include <asm/byteorder.h> |
607ca46e | 40 | #include <uapi/linux/fs.h> |
1da177e4 | 41 | |
b83ae6d4 | 42 | struct backing_dev_info; |
52ebea74 | 43 | struct bdi_writeback; |
2f8b5444 | 44 | struct bio; |
a5694255 | 45 | struct export_operations; |
a885c8c4 | 46 | struct hd_geometry; |
1da177e4 | 47 | struct iovec; |
92198f7e | 48 | struct kiocb; |
57cc7215 | 49 | struct kobject; |
1da177e4 LT |
50 | struct pipe_inode_info; |
51 | struct poll_table_struct; | |
52 | struct kstatfs; | |
53 | struct vm_area_struct; | |
54 | struct vfsmount; | |
745ca247 | 55 | struct cred; |
a509bc1a | 56 | struct swap_info_struct; |
55985dd7 | 57 | struct seq_file; |
7b7a8665 | 58 | struct workqueue_struct; |
3b93f911 | 59 | struct iov_iter; |
0b81d077 JK |
60 | struct fscrypt_info; |
61 | struct fscrypt_operations; | |
1da177e4 | 62 | |
74bf17cf | 63 | extern void __init inode_init(void); |
1da177e4 | 64 | extern void __init inode_init_early(void); |
4248b0da MG |
65 | extern void __init files_init(void); |
66 | extern void __init files_maxfiles_init(void); | |
1da177e4 | 67 | |
dded4f4d | 68 | extern struct files_stat_struct files_stat; |
518de9b3 | 69 | extern unsigned long get_max_files(void); |
9b80a184 | 70 | extern unsigned int sysctl_nr_open; |
dded4f4d JE |
71 | extern struct inodes_stat_t inodes_stat; |
72 | extern int leases_enable, lease_break_time; | |
800179c9 KC |
73 | extern int sysctl_protected_symlinks; |
74 | extern int sysctl_protected_hardlinks; | |
dded4f4d | 75 | |
ddef7ed2 CH |
76 | typedef __kernel_rwf_t rwf_t; |
77 | ||
1da177e4 LT |
78 | struct buffer_head; |
79 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
80 | struct buffer_head *bh_result, int create); | |
187372a3 | 81 | typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
7b7a8665 | 82 | ssize_t bytes, void *private); |
1da177e4 | 83 | |
bbc1096a DH |
84 | #define MAY_EXEC 0x00000001 |
85 | #define MAY_WRITE 0x00000002 | |
86 | #define MAY_READ 0x00000004 | |
87 | #define MAY_APPEND 0x00000008 | |
88 | #define MAY_ACCESS 0x00000010 | |
89 | #define MAY_OPEN 0x00000020 | |
90 | #define MAY_CHDIR 0x00000040 | |
91 | /* called from RCU mode, don't block */ | |
92 | #define MAY_NOT_BLOCK 0x00000080 | |
93 | ||
94 | /* | |
95 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond | |
96 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() | |
97 | */ | |
98 | ||
99 | /* file is open for reading */ | |
100 | #define FMODE_READ ((__force fmode_t)0x1) | |
101 | /* file is open for writing */ | |
102 | #define FMODE_WRITE ((__force fmode_t)0x2) | |
103 | /* file is seekable */ | |
104 | #define FMODE_LSEEK ((__force fmode_t)0x4) | |
105 | /* file can be accessed using pread */ | |
106 | #define FMODE_PREAD ((__force fmode_t)0x8) | |
107 | /* file can be accessed using pwrite */ | |
108 | #define FMODE_PWRITE ((__force fmode_t)0x10) | |
109 | /* File is opened for execution with sys_execve / sys_uselib */ | |
110 | #define FMODE_EXEC ((__force fmode_t)0x20) | |
111 | /* File is opened with O_NDELAY (only set for block devices) */ | |
112 | #define FMODE_NDELAY ((__force fmode_t)0x40) | |
113 | /* File is opened with O_EXCL (only set for block devices) */ | |
114 | #define FMODE_EXCL ((__force fmode_t)0x80) | |
115 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls | |
116 | (specialy hack for floppy.c) */ | |
117 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) | |
118 | /* 32bit hashes as llseek() offset (for directories) */ | |
119 | #define FMODE_32BITHASH ((__force fmode_t)0x200) | |
120 | /* 64bit hashes as llseek() offset (for directories) */ | |
121 | #define FMODE_64BITHASH ((__force fmode_t)0x400) | |
122 | ||
123 | /* | |
124 | * Don't update ctime and mtime. | |
125 | * | |
126 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll | |
127 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. | |
128 | */ | |
129 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) | |
130 | ||
131 | /* Expect random access pattern */ | |
132 | #define FMODE_RANDOM ((__force fmode_t)0x1000) | |
133 | ||
134 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ | |
135 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) | |
136 | ||
137 | /* File is opened with O_PATH; almost nothing can be done with it */ | |
138 | #define FMODE_PATH ((__force fmode_t)0x4000) | |
139 | ||
9c225f26 LT |
140 | /* File needs atomic accesses to f_pos */ |
141 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) | |
83f936c7 AV |
142 | /* Write access to underlying fs */ |
143 | #define FMODE_WRITER ((__force fmode_t)0x10000) | |
7f7f25e8 AV |
144 | /* Has read method(s) */ |
145 | #define FMODE_CAN_READ ((__force fmode_t)0x20000) | |
146 | /* Has write method(s) */ | |
147 | #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) | |
9c225f26 | 148 | |
bbc1096a | 149 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
75069f2b | 150 | #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
bbc1096a | 151 | |
91f9943e CH |
152 | /* File is capable of returning -EAGAIN if I/O will block */ |
153 | #define FMODE_NOWAIT ((__force fmode_t)0x8000000) | |
b745fafa | 154 | |
bbc1096a DH |
155 | /* |
156 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector | |
157 | * that indicates that they should check the contents of the iovec are | |
158 | * valid, but not check the memory that the iovec elements | |
159 | * points too. | |
160 | */ | |
161 | #define CHECK_IOVEC_ONLY -1 | |
162 | ||
1da177e4 LT |
163 | /* |
164 | * Attribute flags. These should be or-ed together to figure out what | |
165 | * has been changed! | |
166 | */ | |
9767d749 MS |
167 | #define ATTR_MODE (1 << 0) |
168 | #define ATTR_UID (1 << 1) | |
169 | #define ATTR_GID (1 << 2) | |
170 | #define ATTR_SIZE (1 << 3) | |
171 | #define ATTR_ATIME (1 << 4) | |
172 | #define ATTR_MTIME (1 << 5) | |
173 | #define ATTR_CTIME (1 << 6) | |
174 | #define ATTR_ATIME_SET (1 << 7) | |
175 | #define ATTR_MTIME_SET (1 << 8) | |
176 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
177 | #define ATTR_ATTR_FLAG (1 << 10) | |
178 | #define ATTR_KILL_SUID (1 << 11) | |
179 | #define ATTR_KILL_SGID (1 << 12) | |
180 | #define ATTR_FILE (1 << 13) | |
181 | #define ATTR_KILL_PRIV (1 << 14) | |
182 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
183 | #define ATTR_TIMES_SET (1 << 16) | |
f2b20f6e | 184 | #define ATTR_TOUCH (1 << 17) |
1da177e4 | 185 | |
787fb6bc MS |
186 | /* |
187 | * Whiteout is represented by a char device. The following constants define the | |
188 | * mode and device number to use. | |
189 | */ | |
190 | #define WHITEOUT_MODE 0 | |
191 | #define WHITEOUT_DEV 0 | |
192 | ||
1da177e4 LT |
193 | /* |
194 | * This is the Inode Attributes structure, used for notify_change(). It | |
195 | * uses the above definitions as flags, to know which values have changed. | |
196 | * Also, in this manner, a Filesystem can look at only the values it cares | |
197 | * about. Basically, these are the attributes that the VFS layer can | |
198 | * request to change from the FS layer. | |
199 | * | |
200 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
201 | */ | |
202 | struct iattr { | |
203 | unsigned int ia_valid; | |
204 | umode_t ia_mode; | |
92361636 EB |
205 | kuid_t ia_uid; |
206 | kgid_t ia_gid; | |
1da177e4 LT |
207 | loff_t ia_size; |
208 | struct timespec ia_atime; | |
209 | struct timespec ia_mtime; | |
210 | struct timespec ia_ctime; | |
cc4e69de MS |
211 | |
212 | /* | |
25985edc | 213 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
214 | * implement an ftruncate() like method. NOTE: filesystem should |
215 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
216 | */ | |
217 | struct file *ia_file; | |
1da177e4 LT |
218 | }; |
219 | ||
1da177e4 LT |
220 | /* |
221 | * Includes for diskquotas. | |
222 | */ | |
223 | #include <linux/quota.h> | |
224 | ||
69c433ed MS |
225 | /* |
226 | * Maximum number of layers of fs stack. Needs to be limited to | |
227 | * prevent kernel stack overflow | |
228 | */ | |
229 | #define FILESYSTEM_MAX_STACK_DEPTH 2 | |
230 | ||
994fc28c ZB |
231 | /** |
232 | * enum positive_aop_returns - aop return codes with specific semantics | |
233 | * | |
234 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
235 | * completed, that the page is still locked, and | |
236 | * should be considered active. The VM uses this hint | |
237 | * to return the page to the active list -- it won't | |
238 | * be a candidate for writeback again in the near | |
239 | * future. Other callers must be careful to unlock | |
240 | * the page if they get this return. Returned by | |
241 | * writepage(); | |
242 | * | |
243 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
244 | * unlocked it and the page might have been truncated. | |
245 | * The caller should back up to acquiring a new page and | |
246 | * trying again. The aop will be taking reasonable | |
247 | * precautions not to livelock. If the caller held a page | |
248 | * reference, it should drop it before retrying. Returned | |
55144768 | 249 | * by readpage(). |
994fc28c ZB |
250 | * |
251 | * address_space_operation functions return these large constants to indicate | |
252 | * special semantics to the caller. These are much larger than the bytes in a | |
253 | * page to allow for functions that return the number of bytes operated on in a | |
254 | * given page. | |
255 | */ | |
256 | ||
257 | enum positive_aop_returns { | |
258 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
259 | AOP_TRUNCATED_PAGE = 0x80001, | |
260 | }; | |
261 | ||
c718a975 TH |
262 | #define AOP_FLAG_CONT_EXPAND 0x0001 /* called from cont_expand */ |
263 | #define AOP_FLAG_NOFS 0x0002 /* used by filesystem to direct | |
54566b2c NP |
264 | * helper code (eg buffer layer) |
265 | * to clear GFP_FS from alloc */ | |
afddba49 | 266 | |
1da177e4 LT |
267 | /* |
268 | * oh the beauties of C type declarations. | |
269 | */ | |
270 | struct page; | |
271 | struct address_space; | |
272 | struct writeback_control; | |
1da177e4 | 273 | |
c75b1d94 JA |
274 | /* |
275 | * Write life time hint values. | |
276 | */ | |
277 | enum rw_hint { | |
278 | WRITE_LIFE_NOT_SET = 0, | |
279 | WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE, | |
280 | WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT, | |
281 | WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, | |
282 | WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, | |
283 | WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, | |
284 | }; | |
285 | ||
e2e40f2c | 286 | #define IOCB_EVENTFD (1 << 0) |
2ba48ce5 AV |
287 | #define IOCB_APPEND (1 << 1) |
288 | #define IOCB_DIRECT (1 << 2) | |
97be7ebe | 289 | #define IOCB_HIPRI (1 << 3) |
dde0c2e7 CH |
290 | #define IOCB_DSYNC (1 << 4) |
291 | #define IOCB_SYNC (1 << 5) | |
70fe2f48 | 292 | #define IOCB_WRITE (1 << 6) |
b745fafa | 293 | #define IOCB_NOWAIT (1 << 7) |
e2e40f2c CH |
294 | |
295 | struct kiocb { | |
296 | struct file *ki_filp; | |
297 | loff_t ki_pos; | |
298 | void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); | |
299 | void *private; | |
300 | int ki_flags; | |
c75b1d94 | 301 | enum rw_hint ki_hint; |
3859a271 | 302 | } __randomize_layout; |
e2e40f2c CH |
303 | |
304 | static inline bool is_sync_kiocb(struct kiocb *kiocb) | |
305 | { | |
306 | return kiocb->ki_complete == NULL; | |
307 | } | |
308 | ||
8ab22b9a HH |
309 | /* |
310 | * "descriptor" for what we're up to with a read. | |
311 | * This allows us to use the same read code yet | |
312 | * have multiple different users of the data that | |
313 | * we read from a file. | |
314 | * | |
315 | * The simplest case just copies the data to user | |
316 | * mode. | |
317 | */ | |
318 | typedef struct { | |
319 | size_t written; | |
320 | size_t count; | |
321 | union { | |
322 | char __user *buf; | |
323 | void *data; | |
324 | } arg; | |
325 | int error; | |
326 | } read_descriptor_t; | |
327 | ||
328 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
329 | unsigned long, unsigned long); | |
2f718ffc | 330 | |
1da177e4 LT |
331 | struct address_space_operations { |
332 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
333 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
334 | |
335 | /* Write back some dirty pages from this mapping. */ | |
336 | int (*writepages)(struct address_space *, struct writeback_control *); | |
337 | ||
4741c9fd | 338 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
339 | int (*set_page_dirty)(struct page *page); |
340 | ||
341 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
342 | struct list_head *pages, unsigned nr_pages); | |
343 | ||
afddba49 NP |
344 | int (*write_begin)(struct file *, struct address_space *mapping, |
345 | loff_t pos, unsigned len, unsigned flags, | |
346 | struct page **pagep, void **fsdata); | |
347 | int (*write_end)(struct file *, struct address_space *mapping, | |
348 | loff_t pos, unsigned len, unsigned copied, | |
349 | struct page *page, void *fsdata); | |
350 | ||
1da177e4 LT |
351 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
352 | sector_t (*bmap)(struct address_space *, sector_t); | |
d47992f8 | 353 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
27496a8c | 354 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 355 | void (*freepage)(struct page *); |
c8b8e32d | 356 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); |
b969c4ab | 357 | /* |
ef277c73 TC |
358 | * migrate the contents of a page to the specified target. If |
359 | * migrate_mode is MIGRATE_ASYNC, it must not block. | |
b969c4ab | 360 | */ |
2d1db3b1 | 361 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 362 | struct page *, struct page *, enum migrate_mode); |
bda807d4 MK |
363 | bool (*isolate_page)(struct page *, isolate_mode_t); |
364 | void (*putback_page)(struct page *); | |
e3db7691 | 365 | int (*launder_page) (struct page *); |
c186afb4 | 366 | int (*is_partially_uptodate) (struct page *, unsigned long, |
8ab22b9a | 367 | unsigned long); |
b4597226 | 368 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
25718736 | 369 | int (*error_remove_page)(struct address_space *, struct page *); |
62c230bc MG |
370 | |
371 | /* swapfile support */ | |
a509bc1a MG |
372 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
373 | sector_t *span); | |
374 | void (*swap_deactivate)(struct file *file); | |
1da177e4 LT |
375 | }; |
376 | ||
7dcda1c9 JA |
377 | extern const struct address_space_operations empty_aops; |
378 | ||
afddba49 NP |
379 | /* |
380 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
381 | * to write into the pagecache. | |
382 | */ | |
383 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
384 | loff_t pos, unsigned len, unsigned flags, | |
385 | struct page **pagep, void **fsdata); | |
386 | ||
387 | int pagecache_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 | struct address_space { |
392 | struct inode *host; /* owner: inode, block_device */ | |
393 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
19fd6231 | 394 | spinlock_t tree_lock; /* and lock protecting it */ |
4bb5f5d9 | 395 | atomic_t i_mmap_writable;/* count VM_SHARED mappings */ |
f808c13f | 396 | struct rb_root_cached i_mmap; /* tree of private and shared mappings */ |
c8c06efa | 397 | struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ |
08142579 | 398 | /* Protected by tree_lock together with the radix tree */ |
1da177e4 | 399 | unsigned long nrpages; /* number of total pages */ |
f9fe48be RZ |
400 | /* number of shadow or DAX exceptional entries */ |
401 | unsigned long nrexceptional; | |
1da177e4 | 402 | pgoff_t writeback_index;/* writeback starts here */ |
f5e54d6e | 403 | const struct address_space_operations *a_ops; /* methods */ |
9c5d760b | 404 | unsigned long flags; /* error bits */ |
1da177e4 | 405 | spinlock_t private_lock; /* for use by the address_space */ |
9c5d760b | 406 | gfp_t gfp_mask; /* implicit gfp mask for allocations */ |
32e57c29 | 407 | struct list_head private_list; /* for use by the address_space */ |
252aa6f5 | 408 | void *private_data; /* ditto */ |
5660e13d | 409 | errseq_t wb_err; |
3859a271 | 410 | } __attribute__((aligned(sizeof(long)))) __randomize_layout; |
1da177e4 LT |
411 | /* |
412 | * On most architectures that alignment is already the case; but | |
25985edc | 413 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
414 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
415 | */ | |
87192a2a | 416 | struct request_queue; |
1da177e4 LT |
417 | |
418 | struct block_device { | |
419 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 420 | int bd_openers; |
1da177e4 | 421 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 422 | struct super_block * bd_super; |
c039e313 | 423 | struct mutex bd_mutex; /* open/close mutex */ |
6b4517a7 | 424 | void * bd_claiming; |
1da177e4 LT |
425 | void * bd_holder; |
426 | int bd_holders; | |
77ea887e | 427 | bool bd_write_holder; |
641dc636 | 428 | #ifdef CONFIG_SYSFS |
49731baa | 429 | struct list_head bd_holder_disks; |
641dc636 | 430 | #endif |
1da177e4 LT |
431 | struct block_device * bd_contains; |
432 | unsigned bd_block_size; | |
c2ee070f | 433 | u8 bd_partno; |
1da177e4 LT |
434 | struct hd_struct * bd_part; |
435 | /* number of times partitions within this device have been opened. */ | |
436 | unsigned bd_part_count; | |
437 | int bd_invalidated; | |
438 | struct gendisk * bd_disk; | |
87192a2a | 439 | struct request_queue * bd_queue; |
b1d2dc56 | 440 | struct backing_dev_info *bd_bdi; |
1da177e4 | 441 | struct list_head bd_list; |
1da177e4 LT |
442 | /* |
443 | * Private data. You must have bd_claim'ed the block_device | |
444 | * to use this. NOTE: bd_claim allows an owner to claim | |
445 | * the same device multiple times, the owner must take special | |
446 | * care to not mess up bd_private for that case. | |
447 | */ | |
448 | unsigned long bd_private; | |
fcccf502 TS |
449 | |
450 | /* The counter of freeze processes */ | |
451 | int bd_fsfreeze_count; | |
452 | /* Mutex for freeze */ | |
453 | struct mutex bd_fsfreeze_mutex; | |
3859a271 | 454 | } __randomize_layout; |
1da177e4 LT |
455 | |
456 | /* | |
457 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
458 | * radix trees | |
459 | */ | |
460 | #define PAGECACHE_TAG_DIRTY 0 | |
461 | #define PAGECACHE_TAG_WRITEBACK 1 | |
f446daae | 462 | #define PAGECACHE_TAG_TOWRITE 2 |
1da177e4 LT |
463 | |
464 | int mapping_tagged(struct address_space *mapping, int tag); | |
465 | ||
8b28f621 DB |
466 | static inline void i_mmap_lock_write(struct address_space *mapping) |
467 | { | |
c8c06efa | 468 | down_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
469 | } |
470 | ||
471 | static inline void i_mmap_unlock_write(struct address_space *mapping) | |
472 | { | |
c8c06efa | 473 | up_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
474 | } |
475 | ||
3dec0ba0 DB |
476 | static inline void i_mmap_lock_read(struct address_space *mapping) |
477 | { | |
478 | down_read(&mapping->i_mmap_rwsem); | |
479 | } | |
480 | ||
481 | static inline void i_mmap_unlock_read(struct address_space *mapping) | |
482 | { | |
483 | up_read(&mapping->i_mmap_rwsem); | |
484 | } | |
485 | ||
1da177e4 LT |
486 | /* |
487 | * Might pages of this file be mapped into userspace? | |
488 | */ | |
489 | static inline int mapping_mapped(struct address_space *mapping) | |
490 | { | |
f808c13f | 491 | return !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root); |
1da177e4 LT |
492 | } |
493 | ||
494 | /* | |
495 | * Might pages of this file have been modified in userspace? | |
496 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
497 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
498 | * writing i.e. vma may be mprotected writable even if now readonly. | |
4bb5f5d9 DH |
499 | * |
500 | * If i_mmap_writable is negative, no new writable mappings are allowed. You | |
501 | * can only deny writable mappings, if none exists right now. | |
1da177e4 LT |
502 | */ |
503 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
504 | { | |
4bb5f5d9 DH |
505 | return atomic_read(&mapping->i_mmap_writable) > 0; |
506 | } | |
507 | ||
508 | static inline int mapping_map_writable(struct address_space *mapping) | |
509 | { | |
510 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? | |
511 | 0 : -EPERM; | |
512 | } | |
513 | ||
514 | static inline void mapping_unmap_writable(struct address_space *mapping) | |
515 | { | |
516 | atomic_dec(&mapping->i_mmap_writable); | |
517 | } | |
518 | ||
519 | static inline int mapping_deny_writable(struct address_space *mapping) | |
520 | { | |
521 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? | |
522 | 0 : -EBUSY; | |
523 | } | |
524 | ||
525 | static inline void mapping_allow_writable(struct address_space *mapping) | |
526 | { | |
527 | atomic_inc(&mapping->i_mmap_writable); | |
1da177e4 LT |
528 | } |
529 | ||
530 | /* | |
531 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
532 | */ | |
533 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
534 | #include <linux/seqlock.h> | |
535 | #define __NEED_I_SIZE_ORDERED | |
536 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
537 | #else | |
538 | #define i_size_ordered_init(inode) do { } while (0) | |
539 | #endif | |
540 | ||
f19d4a8f AV |
541 | struct posix_acl; |
542 | #define ACL_NOT_CACHED ((void *)(-1)) | |
2a3a2a3f | 543 | #define ACL_DONT_CACHE ((void *)(-3)) |
f19d4a8f | 544 | |
b8a7a3a6 AG |
545 | static inline struct posix_acl * |
546 | uncached_acl_sentinel(struct task_struct *task) | |
547 | { | |
548 | return (void *)task + 1; | |
549 | } | |
550 | ||
551 | static inline bool | |
552 | is_uncached_acl(struct posix_acl *acl) | |
553 | { | |
554 | return (long)acl & 1; | |
555 | } | |
556 | ||
3ddcd056 LT |
557 | #define IOP_FASTPERM 0x0001 |
558 | #define IOP_LOOKUP 0x0002 | |
559 | #define IOP_NOFOLLOW 0x0004 | |
d0a5b995 | 560 | #define IOP_XATTR 0x0008 |
76fca90e | 561 | #define IOP_DEFAULT_READLINK 0x0010 |
3ddcd056 | 562 | |
9dd813c1 JK |
563 | struct fsnotify_mark_connector; |
564 | ||
3ddcd056 LT |
565 | /* |
566 | * Keep mostly read-only and often accessed (especially for | |
567 | * the RCU path lookup and 'stat' data) fields at the beginning | |
568 | * of the 'struct inode' | |
569 | */ | |
1da177e4 | 570 | struct inode { |
44a7d7a8 | 571 | umode_t i_mode; |
3ddcd056 | 572 | unsigned short i_opflags; |
92361636 EB |
573 | kuid_t i_uid; |
574 | kgid_t i_gid; | |
3ddcd056 LT |
575 | unsigned int i_flags; |
576 | ||
577 | #ifdef CONFIG_FS_POSIX_ACL | |
578 | struct posix_acl *i_acl; | |
579 | struct posix_acl *i_default_acl; | |
580 | #endif | |
581 | ||
44a7d7a8 NP |
582 | const struct inode_operations *i_op; |
583 | struct super_block *i_sb; | |
3ddcd056 | 584 | struct address_space *i_mapping; |
44a7d7a8 | 585 | |
13e12d14 LT |
586 | #ifdef CONFIG_SECURITY |
587 | void *i_security; | |
588 | #endif | |
44a7d7a8 | 589 | |
3ddcd056 LT |
590 | /* Stat data, not accessed from path walking */ |
591 | unsigned long i_ino; | |
a78ef704 MS |
592 | /* |
593 | * Filesystems may only read i_nlink directly. They shall use the | |
594 | * following functions for modification: | |
595 | * | |
596 | * (set|clear|inc|drop)_nlink | |
597 | * inode_(inc|dec)_link_count | |
598 | */ | |
599 | union { | |
600 | const unsigned int i_nlink; | |
601 | unsigned int __i_nlink; | |
602 | }; | |
3ddcd056 | 603 | dev_t i_rdev; |
2f9d3df8 | 604 | loff_t i_size; |
3ddcd056 LT |
605 | struct timespec i_atime; |
606 | struct timespec i_mtime; | |
607 | struct timespec i_ctime; | |
6cdbb0ef TT |
608 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
609 | unsigned short i_bytes; | |
2f9d3df8 | 610 | unsigned int i_blkbits; |
c75b1d94 | 611 | enum rw_hint i_write_hint; |
3ddcd056 LT |
612 | blkcnt_t i_blocks; |
613 | ||
614 | #ifdef __NEED_I_SIZE_ORDERED | |
615 | seqcount_t i_size_seqcount; | |
616 | #endif | |
617 | ||
618 | /* Misc */ | |
619 | unsigned long i_state; | |
9902af79 | 620 | struct rw_semaphore i_rwsem; |
13e12d14 | 621 | |
44a7d7a8 | 622 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
a2f48706 | 623 | unsigned long dirtied_time_when; |
44a7d7a8 | 624 | |
1da177e4 | 625 | struct hlist_node i_hash; |
c7f54084 | 626 | struct list_head i_io_list; /* backing dev IO list */ |
52ebea74 TH |
627 | #ifdef CONFIG_CGROUP_WRITEBACK |
628 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ | |
2a814908 TH |
629 | |
630 | /* foreign inode detection, see wbc_detach_inode() */ | |
631 | int i_wb_frn_winner; | |
632 | u16 i_wb_frn_avg_time; | |
633 | u16 i_wb_frn_history; | |
52ebea74 | 634 | #endif |
7ccf19a8 | 635 | struct list_head i_lru; /* inode LRU list */ |
1da177e4 | 636 | struct list_head i_sb_list; |
6c60d2b5 | 637 | struct list_head i_wb_list; /* backing dev writeback list */ |
fa0d7e3d | 638 | union { |
b3d9b7a3 | 639 | struct hlist_head i_dentry; |
fa0d7e3d NP |
640 | struct rcu_head i_rcu; |
641 | }; | |
7a224228 | 642 | u64 i_version; |
2f9d3df8 | 643 | atomic_t i_count; |
bd5fe6c5 | 644 | atomic_t i_dio_count; |
6cdbb0ef | 645 | atomic_t i_writecount; |
d984ea60 MZ |
646 | #ifdef CONFIG_IMA |
647 | atomic_t i_readcount; /* struct files open RO */ | |
648 | #endif | |
99ac48f5 | 649 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
4a075e39 | 650 | struct file_lock_context *i_flctx; |
1da177e4 | 651 | struct address_space i_data; |
1da177e4 | 652 | struct list_head i_devices; |
4c154168 TT |
653 | union { |
654 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 655 | struct block_device *i_bdev; |
577c4eb0 | 656 | struct cdev *i_cdev; |
61ba64fc | 657 | char *i_link; |
84e710da | 658 | unsigned i_dir_seq; |
4c154168 | 659 | }; |
1da177e4 LT |
660 | |
661 | __u32 i_generation; | |
662 | ||
3be25f49 EP |
663 | #ifdef CONFIG_FSNOTIFY |
664 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
08991e83 | 665 | struct fsnotify_mark_connector __rcu *i_fsnotify_marks; |
0eeca283 RL |
666 | #endif |
667 | ||
0b81d077 JK |
668 | #if IS_ENABLED(CONFIG_FS_ENCRYPTION) |
669 | struct fscrypt_info *i_crypt_info; | |
670 | #endif | |
671 | ||
8e18e294 | 672 | void *i_private; /* fs or device private pointer */ |
3859a271 | 673 | } __randomize_layout; |
1da177e4 | 674 | |
93407472 FF |
675 | static inline unsigned int i_blocksize(const struct inode *node) |
676 | { | |
677 | return (1 << node->i_blkbits); | |
678 | } | |
679 | ||
1d3382cb AV |
680 | static inline int inode_unhashed(struct inode *inode) |
681 | { | |
682 | return hlist_unhashed(&inode->i_hash); | |
683 | } | |
684 | ||
f2eace23 IM |
685 | /* |
686 | * inode->i_mutex nesting subclasses for the lock validator: | |
687 | * | |
688 | * 0: the object of the current VFS operation | |
689 | * 1: parent | |
690 | * 2: child/target | |
40bd22c9 BF |
691 | * 3: xattr |
692 | * 4: second non-directory | |
d1b72cc6 MS |
693 | * 5: second parent (when locking independent directories in rename) |
694 | * | |
695 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two | |
40bd22c9 | 696 | * non-directories at once. |
f2eace23 IM |
697 | * |
698 | * The locking order between these classes is | |
d1b72cc6 | 699 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
f2eace23 IM |
700 | */ |
701 | enum inode_i_mutex_lock_class | |
702 | { | |
703 | I_MUTEX_NORMAL, | |
704 | I_MUTEX_PARENT, | |
705 | I_MUTEX_CHILD, | |
4df46240 | 706 | I_MUTEX_XATTR, |
d1b72cc6 MS |
707 | I_MUTEX_NONDIR2, |
708 | I_MUTEX_PARENT2, | |
f2eace23 IM |
709 | }; |
710 | ||
5955102c AV |
711 | static inline void inode_lock(struct inode *inode) |
712 | { | |
9902af79 | 713 | down_write(&inode->i_rwsem); |
5955102c AV |
714 | } |
715 | ||
716 | static inline void inode_unlock(struct inode *inode) | |
717 | { | |
9902af79 AV |
718 | up_write(&inode->i_rwsem); |
719 | } | |
720 | ||
721 | static inline void inode_lock_shared(struct inode *inode) | |
722 | { | |
723 | down_read(&inode->i_rwsem); | |
724 | } | |
725 | ||
726 | static inline void inode_unlock_shared(struct inode *inode) | |
727 | { | |
728 | up_read(&inode->i_rwsem); | |
5955102c AV |
729 | } |
730 | ||
731 | static inline int inode_trylock(struct inode *inode) | |
732 | { | |
9902af79 AV |
733 | return down_write_trylock(&inode->i_rwsem); |
734 | } | |
735 | ||
736 | static inline int inode_trylock_shared(struct inode *inode) | |
737 | { | |
738 | return down_read_trylock(&inode->i_rwsem); | |
5955102c AV |
739 | } |
740 | ||
741 | static inline int inode_is_locked(struct inode *inode) | |
742 | { | |
9902af79 | 743 | return rwsem_is_locked(&inode->i_rwsem); |
5955102c AV |
744 | } |
745 | ||
746 | static inline void inode_lock_nested(struct inode *inode, unsigned subclass) | |
747 | { | |
9902af79 | 748 | down_write_nested(&inode->i_rwsem, subclass); |
5955102c AV |
749 | } |
750 | ||
375e289e BF |
751 | void lock_two_nondirectories(struct inode *, struct inode*); |
752 | void unlock_two_nondirectories(struct inode *, struct inode*); | |
753 | ||
1da177e4 LT |
754 | /* |
755 | * NOTE: in a 32bit arch with a preemptable kernel and | |
756 | * an UP compile the i_size_read/write must be atomic | |
757 | * with respect to the local cpu (unlike with preempt disabled), | |
758 | * but they don't need to be atomic with respect to other cpus like in | |
759 | * true SMP (so they need either to either locally disable irq around | |
760 | * the read or for example on x86 they can be still implemented as a | |
761 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
762 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
763 | */ | |
48ed214d | 764 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
765 | { |
766 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
767 | loff_t i_size; | |
768 | unsigned int seq; | |
769 | ||
770 | do { | |
771 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
772 | i_size = inode->i_size; | |
773 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
774 | return i_size; | |
775 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
776 | loff_t i_size; | |
777 | ||
778 | preempt_disable(); | |
779 | i_size = inode->i_size; | |
780 | preempt_enable(); | |
781 | return i_size; | |
782 | #else | |
783 | return inode->i_size; | |
784 | #endif | |
785 | } | |
786 | ||
7762f5a0 MS |
787 | /* |
788 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
789 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
790 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
791 | */ | |
1da177e4 LT |
792 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
793 | { | |
794 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
74e3d1e1 | 795 | preempt_disable(); |
1da177e4 LT |
796 | write_seqcount_begin(&inode->i_size_seqcount); |
797 | inode->i_size = i_size; | |
798 | write_seqcount_end(&inode->i_size_seqcount); | |
74e3d1e1 | 799 | preempt_enable(); |
1da177e4 LT |
800 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
801 | preempt_disable(); | |
802 | inode->i_size = i_size; | |
803 | preempt_enable(); | |
804 | #else | |
805 | inode->i_size = i_size; | |
806 | #endif | |
807 | } | |
808 | ||
48ed214d | 809 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
810 | { |
811 | return MINOR(inode->i_rdev); | |
812 | } | |
813 | ||
48ed214d | 814 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
815 | { |
816 | return MAJOR(inode->i_rdev); | |
817 | } | |
818 | ||
819 | extern struct block_device *I_BDEV(struct inode *inode); | |
820 | ||
821 | struct fown_struct { | |
822 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
823 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
824 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
92361636 | 825 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
826 | int signum; /* posix.1b rt signal to be delivered on IO */ |
827 | }; | |
828 | ||
829 | /* | |
830 | * Track a single file's readahead state | |
831 | */ | |
832 | struct file_ra_state { | |
937085aa FW |
833 | pgoff_t start; /* where readahead started */ |
834 | unsigned int size; /* # of readahead pages */ | |
835 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 836 | there are only # of pages ahead */ |
5ce1110b | 837 | |
937085aa | 838 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 839 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 840 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 841 | }; |
1da177e4 | 842 | |
5ce1110b FW |
843 | /* |
844 | * Check if @index falls in the readahead windows. | |
845 | */ | |
846 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
847 | { | |
f9acc8c7 FW |
848 | return (index >= ra->start && |
849 | index < ra->start + ra->size); | |
5ce1110b FW |
850 | } |
851 | ||
1da177e4 | 852 | struct file { |
2f512016 | 853 | union { |
4f5e65a1 | 854 | struct llist_node fu_llist; |
2f512016 ED |
855 | struct rcu_head fu_rcuhead; |
856 | } f_u; | |
0f7fc9e4 | 857 | struct path f_path; |
dd37978c | 858 | struct inode *f_inode; /* cached value */ |
99ac48f5 | 859 | const struct file_operations *f_op; |
ef3d0fd2 AK |
860 | |
861 | /* | |
9c225f26 | 862 | * Protects f_ep_links, f_flags. |
ef3d0fd2 AK |
863 | * Must not be taken from IRQ context. |
864 | */ | |
865 | spinlock_t f_lock; | |
c75b1d94 | 866 | enum rw_hint f_write_hint; |
516e0cc5 | 867 | atomic_long_t f_count; |
1da177e4 | 868 | unsigned int f_flags; |
aeb5d727 | 869 | fmode_t f_mode; |
9c225f26 | 870 | struct mutex f_pos_lock; |
1da177e4 LT |
871 | loff_t f_pos; |
872 | struct fown_struct f_owner; | |
d76b0d9b | 873 | const struct cred *f_cred; |
1da177e4 LT |
874 | struct file_ra_state f_ra; |
875 | ||
2b47c361 | 876 | u64 f_version; |
50462062 | 877 | #ifdef CONFIG_SECURITY |
1da177e4 | 878 | void *f_security; |
50462062 | 879 | #endif |
1da177e4 LT |
880 | /* needed for tty driver, and maybe others */ |
881 | void *private_data; | |
882 | ||
883 | #ifdef CONFIG_EPOLL | |
884 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
885 | struct list_head f_ep_links; | |
28d82dc1 | 886 | struct list_head f_tfile_llink; |
1da177e4 LT |
887 | #endif /* #ifdef CONFIG_EPOLL */ |
888 | struct address_space *f_mapping; | |
5660e13d | 889 | errseq_t f_wb_err; |
3859a271 KC |
890 | } __randomize_layout |
891 | __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ | |
1da177e4 | 892 | |
990d6c2d AK |
893 | struct file_handle { |
894 | __u32 handle_bytes; | |
895 | int handle_type; | |
896 | /* file identifier */ | |
897 | unsigned char f_handle[0]; | |
898 | }; | |
899 | ||
cb0942b8 AV |
900 | static inline struct file *get_file(struct file *f) |
901 | { | |
902 | atomic_long_inc(&f->f_count); | |
903 | return f; | |
904 | } | |
90f31d0e | 905 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
d7065da0 | 906 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
516e0cc5 | 907 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 LT |
908 | |
909 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
910 | ||
911 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
912 | limits, otherwise bad things can happen in VM. */ | |
913 | #if BITS_PER_LONG==32 | |
0cc3b0ec | 914 | #define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT) |
1da177e4 | 915 | #elif BITS_PER_LONG==64 |
0cc3b0ec | 916 | #define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX) |
1da177e4 LT |
917 | #endif |
918 | ||
919 | #define FL_POSIX 1 | |
920 | #define FL_FLOCK 2 | |
617588d5 | 921 | #define FL_DELEG 4 /* NFSv4 delegation */ |
1da177e4 | 922 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
f475ae95 | 923 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 924 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 925 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 926 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
927 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
928 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
cff2fce5 | 929 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
11afe9f7 | 930 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
1da177e4 | 931 | |
50f2112c BC |
932 | #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE) |
933 | ||
bde74e4b MS |
934 | /* |
935 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
936 | * asynchronous locking. | |
937 | */ | |
938 | #define FILE_LOCK_DEFERRED 1 | |
939 | ||
7ca76311 | 940 | /* legacy typedef, should eventually be removed */ |
17fa388d | 941 | typedef void *fl_owner_t; |
1da177e4 | 942 | |
a7231a97 JL |
943 | struct file_lock; |
944 | ||
1da177e4 | 945 | struct file_lock_operations { |
1da177e4 LT |
946 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
947 | void (*fl_release_private)(struct file_lock *); | |
948 | }; | |
949 | ||
950 | struct lock_manager_operations { | |
8fb47a4f | 951 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
3999e493 | 952 | unsigned long (*lm_owner_key)(struct file_lock *); |
cae80b30 JL |
953 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
954 | void (*lm_put_owner)(fl_owner_t); | |
8fb47a4f | 955 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
d0449b90 | 956 | int (*lm_grant)(struct file_lock *, int); |
4d01b7f5 | 957 | bool (*lm_break)(struct file_lock *); |
7448cc37 | 958 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
1c7dd2ff | 959 | void (*lm_setup)(struct file_lock *, void **); |
1da177e4 LT |
960 | }; |
961 | ||
af558e33 BF |
962 | struct lock_manager { |
963 | struct list_head list; | |
c87fb4a3 BF |
964 | /* |
965 | * NFSv4 and up also want opens blocked during the grace period; | |
966 | * NLM doesn't care: | |
967 | */ | |
968 | bool block_opens; | |
af558e33 BF |
969 | }; |
970 | ||
5ccb0066 SK |
971 | struct net; |
972 | void locks_start_grace(struct net *, struct lock_manager *); | |
af558e33 | 973 | void locks_end_grace(struct lock_manager *); |
5ccb0066 | 974 | int locks_in_grace(struct net *); |
c87fb4a3 | 975 | int opens_in_grace(struct net *); |
af558e33 | 976 | |
1da177e4 LT |
977 | /* that will die - we need it for nfs_lock_info */ |
978 | #include <linux/nfs_fs_i.h> | |
979 | ||
1cb36012 JL |
980 | /* |
981 | * struct file_lock represents a generic "file lock". It's used to represent | |
982 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to | |
983 | * note that the same struct is used to represent both a request for a lock and | |
984 | * the lock itself, but the same object is never used for both. | |
985 | * | |
986 | * FIXME: should we create a separate "struct lock_request" to help distinguish | |
987 | * these two uses? | |
988 | * | |
8116bf4c | 989 | * The varous i_flctx lists are ordered by: |
1cb36012 | 990 | * |
8116bf4c JL |
991 | * 1) lock owner |
992 | * 2) lock range start | |
993 | * 3) lock range end | |
1cb36012 JL |
994 | * |
995 | * Obviously, the last two criteria only matter for POSIX locks. | |
996 | */ | |
1da177e4 LT |
997 | struct file_lock { |
998 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
6dee60f6 | 999 | struct list_head fl_list; /* link into file_lock_context */ |
139ca04e | 1000 | struct hlist_node fl_link; /* node in global lists */ |
1da177e4 LT |
1001 | struct list_head fl_block; /* circular list of blocked processes */ |
1002 | fl_owner_t fl_owner; | |
710b7216 | 1003 | unsigned int fl_flags; |
afc1246f | 1004 | unsigned char fl_type; |
1da177e4 | 1005 | unsigned int fl_pid; |
7012b02a | 1006 | int fl_link_cpu; /* what cpu's list is this on? */ |
1da177e4 LT |
1007 | wait_queue_head_t fl_wait; |
1008 | struct file *fl_file; | |
1da177e4 LT |
1009 | loff_t fl_start; |
1010 | loff_t fl_end; | |
1011 | ||
1012 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
1013 | /* for lease breaks: */ |
1014 | unsigned long fl_break_time; | |
1015 | unsigned long fl_downgrade_time; | |
1da177e4 | 1016 | |
6aed6285 | 1017 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 1018 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
1019 | union { |
1020 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 1021 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
1022 | struct { |
1023 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
1024 | int state; /* state of grant or error if -ve */ | |
1025 | } afs; | |
1da177e4 | 1026 | } fl_u; |
3859a271 | 1027 | } __randomize_layout; |
1da177e4 | 1028 | |
4a075e39 | 1029 | struct file_lock_context { |
6109c850 | 1030 | spinlock_t flc_lock; |
4a075e39 | 1031 | struct list_head flc_flock; |
bd61e0a9 | 1032 | struct list_head flc_posix; |
8634b51f | 1033 | struct list_head flc_lease; |
4a075e39 JL |
1034 | }; |
1035 | ||
1da177e4 LT |
1036 | /* The following constant reflects the upper bound of the file/locking space */ |
1037 | #ifndef OFFSET_MAX | |
1038 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1039 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1040 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1041 | #endif | |
1042 | ||
bfcd17a6 TP |
1043 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1044 | ||
c568d683 MS |
1045 | /* |
1046 | * Return the inode to use for locking | |
1047 | * | |
1048 | * For overlayfs this should be the overlay inode, not the real inode returned | |
1049 | * by file_inode(). For any other fs file_inode(filp) and locks_inode(filp) are | |
1050 | * equal. | |
1051 | */ | |
1052 | static inline struct inode *locks_inode(const struct file *f) | |
1053 | { | |
1054 | return f->f_path.dentry->d_inode; | |
1055 | } | |
1056 | ||
bfcd17a6 | 1057 | #ifdef CONFIG_FILE_LOCKING |
a75d30c7 | 1058 | extern int fcntl_getlk(struct file *, unsigned int, struct flock *); |
c293621b | 1059 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
a75d30c7 | 1060 | struct flock *); |
1da177e4 LT |
1061 | |
1062 | #if BITS_PER_LONG == 32 | |
a75d30c7 | 1063 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *); |
c293621b | 1064 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
a75d30c7 | 1065 | struct flock64 *); |
1da177e4 LT |
1066 | #endif |
1067 | ||
1da177e4 LT |
1068 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1069 | extern int fcntl_getlease(struct file *filp); | |
1070 | ||
1071 | /* fs/locks.c */ | |
f27a0fe0 | 1072 | void locks_free_lock_context(struct inode *inode); |
05fa3135 | 1073 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1074 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1075 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1076 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
3fe0fff1 | 1077 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
1da177e4 | 1078 | extern void locks_remove_posix(struct file *, fl_owner_t); |
78ed8a13 | 1079 | extern void locks_remove_file(struct file *); |
a9e61e25 | 1080 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1081 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1082 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
f891a29f | 1083 | extern int posix_unblock_lock(struct file_lock *); |
3ee17abd | 1084 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1085 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1086 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
e55c34a6 | 1087 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
df4e8d2c | 1088 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
1da177e4 | 1089 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
e6f5c789 JL |
1090 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
1091 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); | |
7448cc37 | 1092 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
6c8c9031 AV |
1093 | struct files_struct; |
1094 | extern void show_fd_locks(struct seq_file *f, | |
1095 | struct file *filp, struct files_struct *files); | |
bfcd17a6 | 1096 | #else /* !CONFIG_FILE_LOCKING */ |
c1e62b8f JL |
1097 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
1098 | struct flock __user *user) | |
c2aca5e5 SW |
1099 | { |
1100 | return -EINVAL; | |
1101 | } | |
1102 | ||
1103 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1104 | unsigned int cmd, struct flock __user *user) | |
1105 | { | |
1106 | return -EACCES; | |
1107 | } | |
1108 | ||
bfcd17a6 | 1109 | #if BITS_PER_LONG == 32 |
c1e62b8f JL |
1110 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
1111 | struct flock64 __user *user) | |
c2aca5e5 SW |
1112 | { |
1113 | return -EINVAL; | |
1114 | } | |
1115 | ||
1116 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1117 | unsigned int cmd, struct flock64 __user *user) | |
1118 | { | |
1119 | return -EACCES; | |
1120 | } | |
bfcd17a6 | 1121 | #endif |
c2aca5e5 SW |
1122 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1123 | { | |
1b2b32dc | 1124 | return -EINVAL; |
c2aca5e5 SW |
1125 | } |
1126 | ||
1127 | static inline int fcntl_getlease(struct file *filp) | |
1128 | { | |
1b2b32dc | 1129 | return F_UNLCK; |
c2aca5e5 SW |
1130 | } |
1131 | ||
4a075e39 | 1132 | static inline void |
f27a0fe0 | 1133 | locks_free_lock_context(struct inode *inode) |
4a075e39 JL |
1134 | { |
1135 | } | |
1136 | ||
c2aca5e5 SW |
1137 | static inline void locks_init_lock(struct file_lock *fl) |
1138 | { | |
1139 | return; | |
1140 | } | |
1141 | ||
3fe0fff1 | 1142 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
c2aca5e5 SW |
1143 | { |
1144 | return; | |
1145 | } | |
1146 | ||
1147 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1148 | { | |
1149 | return; | |
1150 | } | |
1151 | ||
1152 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1153 | { | |
1154 | return; | |
1155 | } | |
1156 | ||
78ed8a13 | 1157 | static inline void locks_remove_file(struct file *filp) |
c2aca5e5 SW |
1158 | { |
1159 | return; | |
1160 | } | |
1161 | ||
1162 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1163 | { | |
1164 | return; | |
1165 | } | |
1166 | ||
1167 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1168 | struct file_lock *conflock) | |
1169 | { | |
1170 | return -ENOLCK; | |
1171 | } | |
1172 | ||
f891a29f | 1173 | static inline int posix_unblock_lock(struct file_lock *waiter) |
c2aca5e5 SW |
1174 | { |
1175 | return -ENOENT; | |
1176 | } | |
1177 | ||
1178 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1179 | { | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1184 | struct file_lock *fl, struct file_lock *conf) | |
1185 | { | |
1186 | return -ENOLCK; | |
1187 | } | |
1188 | ||
1189 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1190 | { | |
1191 | return 0; | |
1192 | } | |
1193 | ||
e55c34a6 BC |
1194 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
1195 | { | |
1196 | return -ENOLCK; | |
1197 | } | |
1198 | ||
df4e8d2c | 1199 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
c2aca5e5 SW |
1200 | { |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) | |
1205 | { | |
1206 | return; | |
1207 | } | |
1208 | ||
1209 | static inline int generic_setlease(struct file *filp, long arg, | |
e6f5c789 | 1210 | struct file_lock **flp, void **priv) |
c2aca5e5 SW |
1211 | { |
1212 | return -EINVAL; | |
1213 | } | |
1214 | ||
1215 | static inline int vfs_setlease(struct file *filp, long arg, | |
e6f5c789 | 1216 | struct file_lock **lease, void **priv) |
c2aca5e5 SW |
1217 | { |
1218 | return -EINVAL; | |
1219 | } | |
1220 | ||
7448cc37 | 1221 | static inline int lease_modify(struct file_lock *fl, int arg, |
c45198ed | 1222 | struct list_head *dispose) |
c2aca5e5 SW |
1223 | { |
1224 | return -EINVAL; | |
1225 | } | |
6c8c9031 AV |
1226 | |
1227 | struct files_struct; | |
1228 | static inline void show_fd_locks(struct seq_file *f, | |
1229 | struct file *filp, struct files_struct *files) {} | |
bfcd17a6 TP |
1230 | #endif /* !CONFIG_FILE_LOCKING */ |
1231 | ||
ee296d7c JL |
1232 | static inline struct inode *file_inode(const struct file *f) |
1233 | { | |
1234 | return f->f_inode; | |
1235 | } | |
1236 | ||
d101a125 MS |
1237 | static inline struct dentry *file_dentry(const struct file *file) |
1238 | { | |
495e6429 | 1239 | return d_real(file->f_path.dentry, file_inode(file), 0, 0); |
d101a125 MS |
1240 | } |
1241 | ||
e55c34a6 BC |
1242 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
1243 | { | |
c568d683 | 1244 | return locks_lock_inode_wait(locks_inode(filp), fl); |
e55c34a6 BC |
1245 | } |
1246 | ||
1da177e4 | 1247 | struct fasync_struct { |
989a2979 ED |
1248 | spinlock_t fa_lock; |
1249 | int magic; | |
1250 | int fa_fd; | |
1251 | struct fasync_struct *fa_next; /* singly linked list */ | |
1252 | struct file *fa_file; | |
1253 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1254 | }; |
1255 | ||
1256 | #define FASYNC_MAGIC 0x4601 | |
1257 | ||
1258 | /* SMP safe fasync helpers: */ | |
1259 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1260 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1261 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1262 | extern struct fasync_struct *fasync_alloc(void); | |
1263 | extern void fasync_free(struct fasync_struct *); | |
1264 | ||
1da177e4 LT |
1265 | /* can be called from interrupts */ |
1266 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1267 | |
e0b93edd | 1268 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
393cc3f5 | 1269 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1da177e4 | 1270 | extern void f_delown(struct file *filp); |
609d7fa9 | 1271 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1272 | extern int send_sigurg(struct fown_struct *fown); |
1273 | ||
e462ec50 DH |
1274 | /* |
1275 | * sb->s_flags. Note that these mirror the equivalent MS_* flags where | |
1276 | * represented in both. | |
1277 | */ | |
1278 | #define SB_RDONLY 1 /* Mount read-only */ | |
1279 | #define SB_NOSUID 2 /* Ignore suid and sgid bits */ | |
1280 | #define SB_NODEV 4 /* Disallow access to device special files */ | |
1281 | #define SB_NOEXEC 8 /* Disallow program execution */ | |
1282 | #define SB_SYNCHRONOUS 16 /* Writes are synced at once */ | |
1283 | #define SB_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
1284 | #define SB_DIRSYNC 128 /* Directory modifications are synchronous */ | |
1285 | #define SB_NOATIME 1024 /* Do not update access times. */ | |
1286 | #define SB_NODIRATIME 2048 /* Do not update directory access times */ | |
1287 | #define SB_SILENT 32768 | |
1288 | #define SB_POSIXACL (1<<16) /* VFS does not apply the umask */ | |
1289 | #define SB_KERNMOUNT (1<<22) /* this is a kern_mount call */ | |
1290 | #define SB_I_VERSION (1<<23) /* Update inode I_version field */ | |
1291 | #define SB_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ | |
1292 | ||
1293 | /* These sb flags are internal to the kernel */ | |
1294 | #define SB_SUBMOUNT (1<<26) | |
1295 | #define SB_NOREMOTELOCK (1<<27) | |
1296 | #define SB_NOSEC (1<<28) | |
1297 | #define SB_BORN (1<<29) | |
1298 | #define SB_ACTIVE (1<<30) | |
1299 | #define SB_NOUSER (1<<31) | |
1300 | ||
1da177e4 LT |
1301 | /* |
1302 | * Umount options | |
1303 | */ | |
1304 | ||
1305 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1306 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1307 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1308 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1309 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 | 1310 | |
46b15caa TH |
1311 | /* sb->s_iflags */ |
1312 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ | |
90f8572b | 1313 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
a2982cc9 | 1314 | #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */ |
1da177e4 | 1315 | |
8654df4e EB |
1316 | /* sb->s_iflags to limit user namespace mounts */ |
1317 | #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */ | |
1da177e4 | 1318 | |
5accdf82 JK |
1319 | /* Possible states of 'frozen' field */ |
1320 | enum { | |
1321 | SB_UNFROZEN = 0, /* FS is unfrozen */ | |
1322 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ | |
5accdf82 JK |
1323 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1324 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop | |
1325 | * internal threads if needed) */ | |
1326 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ | |
1327 | }; | |
1328 | ||
1329 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) | |
1330 | ||
1331 | struct sb_writers { | |
8129ed29 ON |
1332 | int frozen; /* Is sb frozen? */ |
1333 | wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ | |
1334 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; | |
5accdf82 JK |
1335 | }; |
1336 | ||
1da177e4 LT |
1337 | struct super_block { |
1338 | struct list_head s_list; /* Keep this first */ | |
1339 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
270ba5f7 RK |
1340 | unsigned char s_blocksize_bits; |
1341 | unsigned long s_blocksize; | |
42cb56ae | 1342 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1343 | struct file_system_type *s_type; |
ee9b6d61 | 1344 | const struct super_operations *s_op; |
61e225dc | 1345 | const struct dquot_operations *dq_op; |
0d54b217 | 1346 | const struct quotactl_ops *s_qcop; |
39655164 | 1347 | const struct export_operations *s_export_op; |
1da177e4 | 1348 | unsigned long s_flags; |
46b15caa | 1349 | unsigned long s_iflags; /* internal SB_I_* flags */ |
1da177e4 LT |
1350 | unsigned long s_magic; |
1351 | struct dentry *s_root; | |
1352 | struct rw_semaphore s_umount; | |
1da177e4 | 1353 | int s_count; |
1da177e4 | 1354 | atomic_t s_active; |
50462062 | 1355 | #ifdef CONFIG_SECURITY |
1da177e4 | 1356 | void *s_security; |
50462062 | 1357 | #endif |
bb435453 | 1358 | const struct xattr_handler **s_xattr; |
1da177e4 | 1359 | |
0b81d077 JK |
1360 | const struct fscrypt_operations *s_cop; |
1361 | ||
ceb5bdc2 | 1362 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
39f7c4db | 1363 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1da177e4 | 1364 | struct block_device *s_bdev; |
32a88aa1 | 1365 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1366 | struct mtd_info *s_mtd; |
a5166169 | 1367 | struct hlist_node s_instances; |
2c5f648a | 1368 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
1da177e4 LT |
1369 | struct quota_info s_dquot; /* Diskquota specific options */ |
1370 | ||
5accdf82 | 1371 | struct sb_writers s_writers; |
1da177e4 | 1372 | |
85787090 CH |
1373 | char s_id[32]; /* Informational name */ |
1374 | uuid_t s_uuid; /* UUID */ | |
1da177e4 LT |
1375 | |
1376 | void *s_fs_info; /* Filesystem private info */ | |
8de52778 | 1377 | unsigned int s_max_links; |
30c40d2c | 1378 | fmode_t s_mode; |
1da177e4 | 1379 | |
270ba5f7 RK |
1380 | /* Granularity of c/m/atime in ns. |
1381 | Cannot be worse than a second */ | |
1382 | u32 s_time_gran; | |
1383 | ||
1da177e4 LT |
1384 | /* |
1385 | * The next field is for VFS *only*. No filesystems have any business | |
1386 | * even looking at it. You had been warned. | |
1387 | */ | |
a11f3a05 | 1388 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1389 | |
79c0b2df MS |
1390 | /* |
1391 | * Filesystem subtype. If non-empty the filesystem type field | |
1392 | * in /proc/mounts will be "type.subtype" | |
1393 | */ | |
1394 | char *s_subtype; | |
b3b304a2 | 1395 | |
c8aebb0c | 1396 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1397 | |
1398 | /* | |
1399 | * Saved pool identifier for cleancache (-1 means none) | |
1400 | */ | |
1401 | int cleancache_poolid; | |
b0d40c92 DC |
1402 | |
1403 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1404 | |
7ada4db8 MS |
1405 | /* Number of inodes with nlink == 0 but still referenced */ |
1406 | atomic_long_t s_remove_count; | |
1407 | ||
4ed5e82f MS |
1408 | /* Being remounted read-only */ |
1409 | int s_readonly_remount; | |
7b7a8665 CH |
1410 | |
1411 | /* AIO completions deferred from interrupt context */ | |
1412 | struct workqueue_struct *s_dio_done_wq; | |
215752fc | 1413 | struct hlist_head s_pins; |
f6041567 | 1414 | |
6e4eab57 EB |
1415 | /* |
1416 | * Owning user namespace and default context in which to | |
1417 | * interpret filesystem uids, gids, quotas, device nodes, | |
1418 | * xattrs and security labels. | |
1419 | */ | |
1420 | struct user_namespace *s_user_ns; | |
1421 | ||
f6041567 DC |
1422 | /* |
1423 | * Keep the lru lists last in the structure so they always sit on their | |
1424 | * own individual cachelines. | |
1425 | */ | |
1426 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; | |
1427 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; | |
e2fec7c3 | 1428 | struct rcu_head rcu; |
853b39a7 | 1429 | struct work_struct destroy_work; |
69c433ed | 1430 | |
e97fedb9 | 1431 | struct mutex s_sync_lock; /* sync serialisation lock */ |
69c433ed MS |
1432 | |
1433 | /* | |
1434 | * Indicates how deep in a filesystem stack this SB is | |
1435 | */ | |
1436 | int s_stack_depth; | |
74278da9 DC |
1437 | |
1438 | /* s_inode_list_lock protects s_inodes */ | |
1439 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; | |
1440 | struct list_head s_inodes; /* all inodes */ | |
6c60d2b5 DC |
1441 | |
1442 | spinlock_t s_inode_wblist_lock; | |
1443 | struct list_head s_inodes_wb; /* writeback inodes */ | |
3859a271 | 1444 | } __randomize_layout; |
1da177e4 | 1445 | |
81754357 SF |
1446 | /* Helper functions so that in most cases filesystems will |
1447 | * not need to deal directly with kuid_t and kgid_t and can | |
1448 | * instead deal with the raw numeric values that are stored | |
1449 | * in the filesystem. | |
1450 | */ | |
1451 | static inline uid_t i_uid_read(const struct inode *inode) | |
1452 | { | |
1453 | return from_kuid(inode->i_sb->s_user_ns, inode->i_uid); | |
1454 | } | |
1455 | ||
1456 | static inline gid_t i_gid_read(const struct inode *inode) | |
1457 | { | |
1458 | return from_kgid(inode->i_sb->s_user_ns, inode->i_gid); | |
1459 | } | |
1460 | ||
1461 | static inline void i_uid_write(struct inode *inode, uid_t uid) | |
1462 | { | |
1463 | inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid); | |
1464 | } | |
1465 | ||
1466 | static inline void i_gid_write(struct inode *inode, gid_t gid) | |
1467 | { | |
1468 | inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); | |
1469 | } | |
1470 | ||
3cd88666 | 1471 | extern struct timespec current_time(struct inode *inode); |
1da177e4 LT |
1472 | |
1473 | /* | |
1474 | * Snapshotting support. | |
1475 | */ | |
1da177e4 | 1476 | |
5accdf82 JK |
1477 | void __sb_end_write(struct super_block *sb, int level); |
1478 | int __sb_start_write(struct super_block *sb, int level, bool wait); | |
1479 | ||
bee9182d | 1480 | #define __sb_writers_acquired(sb, lev) \ |
8129ed29 | 1481 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1482 | #define __sb_writers_release(sb, lev) \ |
8129ed29 | 1483 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1484 | |
5accdf82 JK |
1485 | /** |
1486 | * sb_end_write - drop write access to a superblock | |
1487 | * @sb: the super we wrote to | |
1488 | * | |
1489 | * Decrement number of writers to the filesystem. Wake up possible waiters | |
1490 | * wanting to freeze the filesystem. | |
1491 | */ | |
1492 | static inline void sb_end_write(struct super_block *sb) | |
1493 | { | |
1494 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1495 | } | |
1496 | ||
1497 | /** | |
1498 | * sb_end_pagefault - drop write access to a superblock from a page fault | |
1499 | * @sb: the super we wrote to | |
1500 | * | |
1501 | * Decrement number of processes handling write page fault to the filesystem. | |
1502 | * Wake up possible waiters wanting to freeze the filesystem. | |
1503 | */ | |
1504 | static inline void sb_end_pagefault(struct super_block *sb) | |
1505 | { | |
1506 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes | |
1511 | * @sb: the super we wrote to | |
1512 | * | |
1513 | * Decrement fs-internal number of writers to the filesystem. Wake up possible | |
1514 | * waiters wanting to freeze the filesystem. | |
1515 | */ | |
1516 | static inline void sb_end_intwrite(struct super_block *sb) | |
1517 | { | |
1518 | __sb_end_write(sb, SB_FREEZE_FS); | |
1519 | } | |
1520 | ||
1521 | /** | |
1522 | * sb_start_write - get write access to a superblock | |
1523 | * @sb: the super we write to | |
1524 | * | |
1525 | * When a process wants to write data or metadata to a file system (i.e. dirty | |
1526 | * a page or an inode), it should embed the operation in a sb_start_write() - | |
1527 | * sb_end_write() pair to get exclusion against file system freezing. This | |
1528 | * function increments number of writers preventing freezing. If the file | |
1529 | * system is already frozen, the function waits until the file system is | |
1530 | * thawed. | |
1531 | * | |
1532 | * Since freeze protection behaves as a lock, users have to preserve | |
1533 | * ordering of freeze protection and other filesystem locks. Generally, | |
1534 | * freeze protection should be the outermost lock. In particular, we have: | |
1535 | * | |
1536 | * sb_start_write | |
1537 | * -> i_mutex (write path, truncate, directory ops, ...) | |
1538 | * -> s_umount (freeze_super, thaw_super) | |
1539 | */ | |
1540 | static inline void sb_start_write(struct super_block *sb) | |
1541 | { | |
1542 | __sb_start_write(sb, SB_FREEZE_WRITE, true); | |
1543 | } | |
1544 | ||
1545 | static inline int sb_start_write_trylock(struct super_block *sb) | |
1546 | { | |
1547 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); | |
1548 | } | |
1549 | ||
1550 | /** | |
1551 | * sb_start_pagefault - get write access to a superblock from a page fault | |
1552 | * @sb: the super we write to | |
1553 | * | |
1554 | * When a process starts handling write page fault, it should embed the | |
1555 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get | |
1556 | * exclusion against file system freezing. This is needed since the page fault | |
1557 | * is going to dirty a page. This function increments number of running page | |
1558 | * faults preventing freezing. If the file system is already frozen, the | |
1559 | * function waits until the file system is thawed. | |
1560 | * | |
1561 | * Since page fault freeze protection behaves as a lock, users have to preserve | |
1562 | * ordering of freeze protection and other filesystem locks. It is advised to | |
1563 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault | |
1564 | * handling code implies lock dependency: | |
1565 | * | |
1566 | * mmap_sem | |
1567 | * -> sb_start_pagefault | |
1568 | */ | |
1569 | static inline void sb_start_pagefault(struct super_block *sb) | |
1570 | { | |
1571 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * sb_start_intwrite - get write access to a superblock for internal fs purposes | |
1576 | * @sb: the super we write to | |
1577 | * | |
1578 | * This is the third level of protection against filesystem freezing. It is | |
1579 | * free for use by a filesystem. The only requirement is that it must rank | |
1580 | * below sb_start_pagefault. | |
1581 | * | |
1582 | * For example filesystem can call sb_start_intwrite() when starting a | |
1583 | * transaction which somewhat eases handling of freezing for internal sources | |
1584 | * of filesystem changes (internal fs threads, discarding preallocation on file | |
1585 | * close, etc.). | |
1586 | */ | |
1587 | static inline void sb_start_intwrite(struct super_block *sb) | |
1588 | { | |
1589 | __sb_start_write(sb, SB_FREEZE_FS, true); | |
1590 | } | |
1da177e4 | 1591 | |
1da177e4 | 1592 | |
2e149670 | 1593 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1594 | |
1da177e4 LT |
1595 | /* |
1596 | * VFS helper functions.. | |
1597 | */ | |
312b63fb | 1598 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 1599 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1600 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1601 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
146a8595 | 1602 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
1da177e4 | 1603 | extern int vfs_rmdir(struct inode *, struct dentry *); |
b21996e3 | 1604 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
520c8b16 | 1605 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
787fb6bc | 1606 | extern int vfs_whiteout(struct inode *, struct dentry *); |
1da177e4 | 1607 | |
af7bd4dc AG |
1608 | extern struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, |
1609 | int open_flag); | |
1610 | ||
8c744fb8 CH |
1611 | /* |
1612 | * VFS file helper functions. | |
1613 | */ | |
a1bd120d | 1614 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1615 | umode_t mode); |
a2982cc9 | 1616 | extern bool may_open_dev(const struct path *path); |
c4b929b8 MF |
1617 | /* |
1618 | * VFS FS_IOC_FIEMAP helper definitions. | |
1619 | */ | |
1620 | struct fiemap_extent_info { | |
1621 | unsigned int fi_flags; /* Flags as passed from user */ | |
1622 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1623 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1624 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1625 | fiemap_extent array */ | |
c4b929b8 MF |
1626 | }; |
1627 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1628 | u64 phys, u64 len, u32 flags); | |
1629 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1630 | ||
1da177e4 LT |
1631 | /* |
1632 | * File types | |
1633 | * | |
1634 | * NOTE! These match bits 12..15 of stat.st_mode | |
1635 | * (ie "(i_mode >> 12) & 15"). | |
1636 | */ | |
1637 | #define DT_UNKNOWN 0 | |
1638 | #define DT_FIFO 1 | |
1639 | #define DT_CHR 2 | |
1640 | #define DT_DIR 4 | |
1641 | #define DT_BLK 6 | |
1642 | #define DT_REG 8 | |
1643 | #define DT_LNK 10 | |
1644 | #define DT_SOCK 12 | |
1645 | #define DT_WHT 14 | |
1646 | ||
1da177e4 LT |
1647 | /* |
1648 | * This is the "filldir" function type, used by readdir() to let | |
1649 | * the kernel specify what kind of dirent layout it wants to have. | |
1650 | * This allows the kernel to read directories into kernel space or | |
1651 | * to have different dirent layouts depending on the binary type. | |
1652 | */ | |
ac7576f4 MS |
1653 | struct dir_context; |
1654 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, | |
1655 | unsigned); | |
1656 | ||
5c0ba4e0 | 1657 | struct dir_context { |
ac6614b7 | 1658 | const filldir_t actor; |
bb6f619b | 1659 | loff_t pos; |
5c0ba4e0 | 1660 | }; |
bb6f619b | 1661 | |
08f85851 | 1662 | struct block_device_operations; |
1da177e4 | 1663 | |
1da177e4 LT |
1664 | /* These macros are for out of kernel modules to test that |
1665 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1666 | * fields in struct file_operations. */ | |
1667 | #define HAVE_COMPAT_IOCTL 1 | |
1668 | #define HAVE_UNLOCKED_IOCTL 1 | |
1669 | ||
b4caecd4 CH |
1670 | /* |
1671 | * These flags let !MMU mmap() govern direct device mapping vs immediate | |
1672 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. | |
1673 | * | |
1674 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) | |
1675 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) | |
1676 | * NOMMU_MAP_READ: Can be mapped for reading | |
1677 | * NOMMU_MAP_WRITE: Can be mapped for writing | |
1678 | * NOMMU_MAP_EXEC: Can be mapped for execution | |
1679 | */ | |
1680 | #define NOMMU_MAP_COPY 0x00000001 | |
1681 | #define NOMMU_MAP_DIRECT 0x00000008 | |
1682 | #define NOMMU_MAP_READ VM_MAYREAD | |
1683 | #define NOMMU_MAP_WRITE VM_MAYWRITE | |
1684 | #define NOMMU_MAP_EXEC VM_MAYEXEC | |
1685 | ||
1686 | #define NOMMU_VMFLAGS \ | |
1687 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) | |
1688 | ||
1689 | ||
293bc982 AV |
1690 | struct iov_iter; |
1691 | ||
1da177e4 LT |
1692 | struct file_operations { |
1693 | struct module *owner; | |
1694 | loff_t (*llseek) (struct file *, loff_t, int); | |
1695 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1696 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
293bc982 AV |
1697 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
1698 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); | |
bb6f619b | 1699 | int (*iterate) (struct file *, struct dir_context *); |
61922694 | 1700 | int (*iterate_shared) (struct file *, struct dir_context *); |
1da177e4 | 1701 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
1da177e4 LT |
1702 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1703 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1704 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1705 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1706 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1707 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1708 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1709 | int (*fasync) (int, struct file *, int); |
1710 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1711 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1712 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1713 | int (*check_flags)(int); | |
1da177e4 | 1714 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1715 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1716 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
e6f5c789 | 1717 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
2fe17c10 CH |
1718 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1719 | loff_t len); | |
a3816ab0 | 1720 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
b4caecd4 CH |
1721 | #ifndef CONFIG_MMU |
1722 | unsigned (*mmap_capabilities)(struct file *); | |
1723 | #endif | |
04b38d60 CH |
1724 | ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, |
1725 | loff_t, size_t, unsigned int); | |
1726 | int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t, | |
1727 | u64); | |
54dbc151 DW |
1728 | ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *, |
1729 | u64); | |
3859a271 | 1730 | } __randomize_layout; |
1da177e4 LT |
1731 | |
1732 | struct inode_operations { | |
00cd8dd3 | 1733 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
fceef393 | 1734 | const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); |
10556cb2 | 1735 | int (*permission) (struct inode *, int); |
4e34e719 | 1736 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1737 | |
1738 | int (*readlink) (struct dentry *, char __user *,int); | |
44a7d7a8 | 1739 | |
ebfc3b49 | 1740 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1da177e4 LT |
1741 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1742 | int (*unlink) (struct inode *,struct dentry *); | |
1743 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1744 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1745 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1746 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 1747 | int (*rename) (struct inode *, struct dentry *, |
520c8b16 | 1748 | struct inode *, struct dentry *, unsigned int); |
1da177e4 | 1749 | int (*setattr) (struct dentry *, struct iattr *); |
a528d35e | 1750 | int (*getattr) (const struct path *, struct kstat *, u32, unsigned int); |
1da177e4 | 1751 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
c4b929b8 MF |
1752 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1753 | u64 len); | |
c3b2da31 | 1754 | int (*update_time)(struct inode *, struct timespec *, int); |
d9585277 | 1755 | int (*atomic_open)(struct inode *, struct dentry *, |
30d90494 | 1756 | struct file *, unsigned open_flag, |
d9585277 | 1757 | umode_t create_mode, int *opened); |
60545d0d | 1758 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
893d46e4 | 1759 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
44a7d7a8 | 1760 | } ____cacheline_aligned; |
1da177e4 | 1761 | |
bb7462b6 MS |
1762 | static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio, |
1763 | struct iov_iter *iter) | |
1764 | { | |
1765 | return file->f_op->read_iter(kio, iter); | |
1766 | } | |
1767 | ||
1768 | static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio, | |
1769 | struct iov_iter *iter) | |
1770 | { | |
1771 | return file->f_op->write_iter(kio, iter); | |
1772 | } | |
1773 | ||
f74ac015 MS |
1774 | static inline int call_mmap(struct file *file, struct vm_area_struct *vma) |
1775 | { | |
1776 | return file->f_op->mmap(file, vma); | |
1777 | } | |
1778 | ||
eed4e51f | 1779 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1780 | unsigned long nr_segs, unsigned long fast_segs, |
1781 | struct iovec *fast_pointer, | |
ac34ebb3 | 1782 | struct iovec **ret_pointer); |
eed4e51f | 1783 | |
6fb5032e | 1784 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); |
1da177e4 LT |
1785 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1786 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1787 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
ddef7ed2 | 1788 | unsigned long, loff_t *, rwf_t); |
29732938 ZB |
1789 | extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, |
1790 | loff_t, size_t, unsigned int); | |
876bec6f DW |
1791 | extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in, |
1792 | struct inode *inode_out, loff_t pos_out, | |
1793 | u64 *len, bool is_dedupe); | |
04b38d60 CH |
1794 | extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in, |
1795 | struct file *file_out, loff_t pos_out, u64 len); | |
876bec6f DW |
1796 | extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, |
1797 | struct inode *dest, loff_t destoff, | |
1798 | loff_t len, bool *is_same); | |
54dbc151 DW |
1799 | extern int vfs_dedupe_file_range(struct file *file, |
1800 | struct file_dedupe_range *same); | |
1da177e4 | 1801 | |
1da177e4 LT |
1802 | struct super_operations { |
1803 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1804 | void (*destroy_inode)(struct inode *); | |
1805 | ||
aa385729 | 1806 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1807 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1808 | int (*drop_inode) (struct inode *); |
be7ce416 | 1809 | void (*evict_inode) (struct inode *); |
1da177e4 | 1810 | void (*put_super) (struct super_block *); |
1da177e4 | 1811 | int (*sync_fs)(struct super_block *sb, int wait); |
48b6bca6 | 1812 | int (*freeze_super) (struct super_block *); |
c4be0c1d | 1813 | int (*freeze_fs) (struct super_block *); |
48b6bca6 | 1814 | int (*thaw_super) (struct super_block *); |
c4be0c1d | 1815 | int (*unfreeze_fs) (struct super_block *); |
726c3342 | 1816 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1817 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1818 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1819 | |
34c80b1d | 1820 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1821 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1822 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1823 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1824 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1825 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1826 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
2d0fa467 | 1827 | struct dquot **(*get_dquots)(struct inode *); |
0e51a720 | 1828 | #endif |
87d8fe1e | 1829 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
4101b624 VD |
1830 | long (*nr_cached_objects)(struct super_block *, |
1831 | struct shrink_control *); | |
1832 | long (*free_cached_objects)(struct super_block *, | |
1833 | struct shrink_control *); | |
1da177e4 LT |
1834 | }; |
1835 | ||
bbc1096a DH |
1836 | /* |
1837 | * Inode flags - they have no relation to superblock flags now | |
1838 | */ | |
1839 | #define S_SYNC 1 /* Writes are synced at once */ | |
1840 | #define S_NOATIME 2 /* Do not update access times */ | |
1841 | #define S_APPEND 4 /* Append-only file */ | |
1842 | #define S_IMMUTABLE 8 /* Immutable file */ | |
1843 | #define S_DEAD 16 /* removed, but still open directory */ | |
1844 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
1845 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
1846 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
1847 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
1848 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
1849 | #define S_IMA 1024 /* Inode has an associated IMA struct */ | |
1850 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ | |
1851 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ | |
6cd176a5 | 1852 | #ifdef CONFIG_FS_DAX |
fbbbad4b MW |
1853 | #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
1854 | #else | |
1855 | #define S_DAX 0 /* Make all the DAX code disappear */ | |
1856 | #endif | |
bbc1096a DH |
1857 | |
1858 | /* | |
1859 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
1860 | * flags just means all the inodes inherit those flags by default. It might be | |
1861 | * possible to override it selectively if you really wanted to with some | |
1862 | * ioctl() that is not currently implemented. | |
1863 | * | |
e462ec50 | 1864 | * Exception: SB_RDONLY is always applied to the entire file system. |
bbc1096a DH |
1865 | * |
1866 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
1867 | * with files in use. This means that all of the inodes will not have their | |
1868 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
1869 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
1870 | */ | |
1871 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) | |
1872 | ||
94e92e7a DH |
1873 | static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & MS_RDONLY; } |
1874 | #define IS_RDONLY(inode) sb_rdonly((inode)->i_sb) | |
e462ec50 | 1875 | #define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \ |
bbc1096a | 1876 | ((inode)->i_flags & S_SYNC)) |
e462ec50 | 1877 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \ |
bbc1096a | 1878 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
e462ec50 DH |
1879 | #define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK) |
1880 | #define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME) | |
1881 | #define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION) | |
bbc1096a DH |
1882 | |
1883 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
1884 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
1885 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
e462ec50 | 1886 | #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL) |
bbc1096a DH |
1887 | |
1888 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
1889 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
1890 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
1891 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
1892 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) | |
1893 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) | |
1894 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) | |
fbbbad4b | 1895 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
bbc1096a | 1896 | |
787fb6bc MS |
1897 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
1898 | (inode)->i_rdev == WHITEOUT_DEV) | |
1899 | ||
0bd23d09 EB |
1900 | static inline bool HAS_UNMAPPED_ID(struct inode *inode) |
1901 | { | |
1902 | return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid); | |
1903 | } | |
1904 | ||
c75b1d94 JA |
1905 | static inline enum rw_hint file_write_hint(struct file *file) |
1906 | { | |
1907 | if (file->f_write_hint != WRITE_LIFE_NOT_SET) | |
1908 | return file->f_write_hint; | |
1909 | ||
1910 | return file_inode(file)->i_write_hint; | |
1911 | } | |
1912 | ||
1913 | static inline int iocb_flags(struct file *file); | |
1914 | ||
1915 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) | |
1916 | { | |
1917 | *kiocb = (struct kiocb) { | |
1918 | .ki_filp = filp, | |
1919 | .ki_flags = iocb_flags(filp), | |
1920 | .ki_hint = file_write_hint(filp), | |
1921 | }; | |
1922 | } | |
1923 | ||
1c0eeaf5 | 1924 | /* |
250df6ed | 1925 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
1926 | * |
1927 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1928 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1929 | * | |
1930 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1931 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1932 | * various stages of removing an inode. | |
1933 | * | |
eaff8079 | 1934 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 1935 | * |
e7ca2d41 JE |
1936 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1937 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
1938 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1939 | * these changes separately from I_DIRTY_SYNC so that we | |
1940 | * don't have to write inode on fdatasync() when only | |
1941 | * mtime has changed in it. | |
1c0eeaf5 | 1942 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
1943 | * I_NEW Serves as both a mutex and completion notification. |
1944 | * New inodes set I_NEW. If two processes both create | |
1945 | * the same inode, one of them will release its inode and | |
1946 | * wait for I_NEW to be released before returning. | |
1947 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1948 | * also cause waiting on I_NEW, without I_NEW actually | |
1949 | * being set. find_inode() uses this to prevent returning | |
1950 | * nearly-dead inodes. | |
1c0eeaf5 JE |
1951 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1952 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1953 | * cleared. | |
1954 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1955 | * pages or buffers attached or the inode itself is still | |
1956 | * dirty. | |
dbd5768f JK |
1957 | * I_CLEAR Added by clear_inode(). In this state the inode is |
1958 | * clean and can be destroyed. Inode keeps I_FREEING. | |
1c0eeaf5 JE |
1959 | * |
1960 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1961 | * prohibited for many purposes. iget() must wait for | |
1962 | * the inode to be completely released, then create it | |
1963 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 1964 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 1965 | * |
169ebd90 JK |
1966 | * I_SYNC Writeback of inode is running. The bit is set during |
1967 | * data writeback, and cleared with a wakeup on the bit | |
1968 | * address once it is done. The bit is also used to pin | |
1969 | * the inode in memory for flusher thread. | |
1c0eeaf5 | 1970 | * |
bd5fe6c5 CH |
1971 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1972 | * | |
1973 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
1974 | * | |
682aa8e1 TH |
1975 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
1976 | * synchronize competing switching instances and to tell | |
1977 | * wb stat updates to grab mapping->tree_lock. See | |
1978 | * inode_switch_wb_work_fn() for details. | |
1979 | * | |
ad0af710 AG |
1980 | * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper |
1981 | * and work dirs among overlayfs mounts. | |
1982 | * | |
1c0eeaf5 | 1983 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 1984 | */ |
9e38d86f NP |
1985 | #define I_DIRTY_SYNC (1 << 0) |
1986 | #define I_DIRTY_DATASYNC (1 << 1) | |
1987 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
1988 | #define __I_NEW 3 |
1989 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
1990 | #define I_WILL_FREE (1 << 4) |
1991 | #define I_FREEING (1 << 5) | |
1992 | #define I_CLEAR (1 << 6) | |
eaff8079 | 1993 | #define __I_SYNC 7 |
1c0eeaf5 | 1994 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 1995 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 | 1996 | #define __I_DIO_WAKEUP 9 |
ac74d8d6 | 1997 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
f4e0c30c | 1998 | #define I_LINKABLE (1 << 10) |
0ae45f63 TT |
1999 | #define I_DIRTY_TIME (1 << 11) |
2000 | #define __I_DIRTY_TIME_EXPIRED 12 | |
2001 | #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) | |
682aa8e1 | 2002 | #define I_WB_SWITCH (1 << 13) |
ad0af710 | 2003 | #define I_OVL_INUSE (1 << 14) |
1da177e4 LT |
2004 | |
2005 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
0ae45f63 | 2006 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
1da177e4 LT |
2007 | |
2008 | extern void __mark_inode_dirty(struct inode *, int); | |
2009 | static inline void mark_inode_dirty(struct inode *inode) | |
2010 | { | |
2011 | __mark_inode_dirty(inode, I_DIRTY); | |
2012 | } | |
2013 | ||
2014 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
2015 | { | |
2016 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
2017 | } | |
2018 | ||
7ada4db8 MS |
2019 | extern void inc_nlink(struct inode *inode); |
2020 | extern void drop_nlink(struct inode *inode); | |
2021 | extern void clear_nlink(struct inode *inode); | |
2022 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
2023 | |
2024 | static inline void inode_inc_link_count(struct inode *inode) | |
2025 | { | |
2026 | inc_nlink(inode); | |
66d21730 AD |
2027 | mark_inode_dirty(inode); |
2028 | } | |
2029 | ||
9a53c3a7 DH |
2030 | static inline void inode_dec_link_count(struct inode *inode) |
2031 | { | |
2032 | drop_nlink(inode); | |
66d21730 AD |
2033 | mark_inode_dirty(inode); |
2034 | } | |
2035 | ||
25ec56b5 JNC |
2036 | /** |
2037 | * inode_inc_iversion - increments i_version | |
2038 | * @inode: inode that need to be updated | |
2039 | * | |
2040 | * Every time the inode is modified, the i_version field will be incremented. | |
2041 | * The filesystem has to be mounted with i_version flag | |
2042 | */ | |
2043 | ||
2044 | static inline void inode_inc_iversion(struct inode *inode) | |
2045 | { | |
2046 | spin_lock(&inode->i_lock); | |
2047 | inode->i_version++; | |
2048 | spin_unlock(&inode->i_lock); | |
2049 | } | |
2050 | ||
c3b2da31 JB |
2051 | enum file_time_flags { |
2052 | S_ATIME = 1, | |
2053 | S_MTIME = 2, | |
2054 | S_CTIME = 4, | |
2055 | S_VERSION = 8, | |
2056 | }; | |
2057 | ||
badcf2b7 | 2058 | extern void touch_atime(const struct path *); |
1da177e4 LT |
2059 | static inline void file_accessed(struct file *file) |
2060 | { | |
2061 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 2062 | touch_atime(&file->f_path); |
1da177e4 LT |
2063 | } |
2064 | ||
2065 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 2066 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 2067 | |
1da177e4 LT |
2068 | struct file_system_type { |
2069 | const char *name; | |
2070 | int fs_flags; | |
bbc1096a DH |
2071 | #define FS_REQUIRES_DEV 1 |
2072 | #define FS_BINARY_MOUNTDATA 2 | |
2073 | #define FS_HAS_SUBTYPE 4 | |
0c55cfc4 | 2074 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
bbc1096a | 2075 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
c96e41e9 AV |
2076 | struct dentry *(*mount) (struct file_system_type *, int, |
2077 | const char *, void *); | |
1da177e4 LT |
2078 | void (*kill_sb) (struct super_block *); |
2079 | struct module *owner; | |
2080 | struct file_system_type * next; | |
a5166169 | 2081 | struct hlist_head fs_supers; |
d475fd42 | 2082 | |
cf516249 | 2083 | struct lock_class_key s_lock_key; |
897c6ff9 | 2084 | struct lock_class_key s_umount_key; |
51ee049e | 2085 | struct lock_class_key s_vfs_rename_key; |
5accdf82 | 2086 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
d475fd42 PZ |
2087 | |
2088 | struct lock_class_key i_lock_key; | |
2089 | struct lock_class_key i_mutex_key; | |
14358e6d | 2090 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
2091 | }; |
2092 | ||
7f78e035 EB |
2093 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
2094 | ||
d91ee87d EB |
2095 | extern struct dentry *mount_ns(struct file_system_type *fs_type, |
2096 | int flags, void *data, void *ns, struct user_namespace *user_ns, | |
2097 | int (*fill_super)(struct super_block *, void *, int)); | |
152a0836 AV |
2098 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2099 | int flags, const char *dev_name, void *data, | |
2100 | int (*fill_super)(struct super_block *, void *, int)); | |
fc14f2fe AV |
2101 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2102 | int flags, void *data, | |
2103 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
2104 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2105 | int flags, void *data, | |
2106 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 2107 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 LT |
2108 | void generic_shutdown_super(struct super_block *sb); |
2109 | void kill_block_super(struct super_block *sb); | |
2110 | void kill_anon_super(struct super_block *sb); | |
2111 | void kill_litter_super(struct super_block *sb); | |
2112 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 2113 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 2114 | int set_anon_super(struct super_block *s, void *data); |
0ee5dc67 AV |
2115 | int get_anon_bdev(dev_t *); |
2116 | void free_anon_bdev(dev_t); | |
6e4eab57 EB |
2117 | struct super_block *sget_userns(struct file_system_type *type, |
2118 | int (*test)(struct super_block *,void *), | |
2119 | int (*set)(struct super_block *,void *), | |
2120 | int flags, struct user_namespace *user_ns, | |
2121 | void *data); | |
1da177e4 LT |
2122 | struct super_block *sget(struct file_system_type *type, |
2123 | int (*test)(struct super_block *,void *), | |
2124 | int (*set)(struct super_block *,void *), | |
9249e17f | 2125 | int flags, void *data); |
bba0bd31 AG |
2126 | extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *, |
2127 | const struct super_operations *ops, | |
2128 | const struct xattr_handler **xattr, | |
2129 | const struct dentry_operations *dops, | |
2130 | unsigned long); | |
2131 | ||
2132 | static inline struct dentry * | |
2133 | mount_pseudo(struct file_system_type *fs_type, char *name, | |
2134 | const struct super_operations *ops, | |
2135 | const struct dentry_operations *dops, unsigned long magic) | |
2136 | { | |
2137 | return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic); | |
2138 | } | |
1da177e4 LT |
2139 | |
2140 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
2141 | #define fops_get(fops) \ | |
2142 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
2143 | #define fops_put(fops) \ | |
2144 | do { if (fops) module_put((fops)->owner); } while(0) | |
e84f9e57 AV |
2145 | /* |
2146 | * This one is to be used *ONLY* from ->open() instances. | |
2147 | * fops must be non-NULL, pinned down *and* module dependencies | |
2148 | * should be sufficient to pin the caller down as well. | |
2149 | */ | |
2150 | #define replace_fops(f, fops) \ | |
2151 | do { \ | |
2152 | struct file *__file = (f); \ | |
2153 | fops_put(__file->f_op); \ | |
2154 | BUG_ON(!(__file->f_op = (fops))); \ | |
2155 | } while(0) | |
1da177e4 LT |
2156 | |
2157 | extern int register_filesystem(struct file_system_type *); | |
2158 | extern int unregister_filesystem(struct file_system_type *); | |
8bf9725c PE |
2159 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
2160 | #define kern_mount(type) kern_mount_data(type, NULL) | |
423e0ab0 | 2161 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
2162 | extern int may_umount_tree(struct vfsmount *); |
2163 | extern int may_umount(struct vfsmount *); | |
5e6123f3 SL |
2164 | extern long do_mount(const char *, const char __user *, |
2165 | const char *, unsigned long, void *); | |
ca71cf71 | 2166 | extern struct vfsmount *collect_mounts(const struct path *); |
8aec0809 | 2167 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
2168 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
2169 | struct vfsmount *); | |
f0bb5aaf | 2170 | extern int vfs_statfs(const struct path *, struct kstatfs *); |
c8b91acc AV |
2171 | extern int user_statfs(const char __user *, struct kstatfs *); |
2172 | extern int fd_statfs(int, struct kstatfs *); | |
cf31e70d | 2173 | extern int vfs_ustat(dev_t, struct kstatfs *); |
18e9e510 JB |
2174 | extern int freeze_super(struct super_block *super); |
2175 | extern int thaw_super(struct super_block *super); | |
02125a82 | 2176 | extern bool our_mnt(struct vfsmount *mnt); |
fca39346 JK |
2177 | extern __printf(2, 3) |
2178 | int super_setup_bdi_name(struct super_block *sb, char *fmt, ...); | |
2179 | extern int super_setup_bdi(struct super_block *sb); | |
1da177e4 | 2180 | |
ce3b0f8d AV |
2181 | extern int current_umask(void); |
2182 | ||
5a14696c BF |
2183 | extern void ihold(struct inode * inode); |
2184 | extern void iput(struct inode *); | |
0ae45f63 | 2185 | extern int generic_update_time(struct inode *, struct timespec *, int); |
5a14696c | 2186 | |
f87fd4c2 | 2187 | /* /sys/fs */ |
00d26666 | 2188 | extern struct kobject *fs_kobj; |
f87fd4c2 | 2189 | |
09cbfeaf | 2190 | #define MAX_RW_COUNT (INT_MAX & PAGE_MASK) |
bfcd17a6 | 2191 | |
9e8925b6 | 2192 | #ifdef CONFIG_MANDATORY_FILE_LOCKING |
d7a06983 | 2193 | extern int locks_mandatory_locked(struct file *); |
acc15575 | 2194 | extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char); |
1da177e4 LT |
2195 | |
2196 | /* | |
2197 | * Candidates for mandatory locking have the setgid bit set | |
2198 | * but no group execute bit - an otherwise meaningless combination. | |
2199 | */ | |
a16877ca PE |
2200 | |
2201 | static inline int __mandatory_lock(struct inode *ino) | |
2202 | { | |
2203 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
2204 | } | |
2205 | ||
2206 | /* | |
e462ec50 | 2207 | * ... and these candidates should be on SB_MANDLOCK mounted fs, |
a16877ca PE |
2208 | * otherwise these will be advisory locks |
2209 | */ | |
2210 | ||
2211 | static inline int mandatory_lock(struct inode *ino) | |
2212 | { | |
2213 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
2214 | } | |
1da177e4 | 2215 | |
d7a06983 | 2216 | static inline int locks_verify_locked(struct file *file) |
1da177e4 | 2217 | { |
c568d683 | 2218 | if (mandatory_lock(locks_inode(file))) |
d7a06983 | 2219 | return locks_mandatory_locked(file); |
1da177e4 LT |
2220 | return 0; |
2221 | } | |
2222 | ||
1da177e4 | 2223 | static inline int locks_verify_truncate(struct inode *inode, |
acc15575 | 2224 | struct file *f, |
1da177e4 LT |
2225 | loff_t size) |
2226 | { | |
acc15575 CH |
2227 | if (!inode->i_flctx || !mandatory_lock(inode)) |
2228 | return 0; | |
2229 | ||
2230 | if (size < inode->i_size) { | |
2231 | return locks_mandatory_area(inode, f, size, inode->i_size - 1, | |
2232 | F_WRLCK); | |
2233 | } else { | |
2234 | return locks_mandatory_area(inode, f, inode->i_size, size - 1, | |
2235 | F_WRLCK); | |
2236 | } | |
1da177e4 LT |
2237 | } |
2238 | ||
9e8925b6 JL |
2239 | #else /* !CONFIG_MANDATORY_FILE_LOCKING */ |
2240 | ||
2241 | static inline int locks_mandatory_locked(struct file *file) | |
2242 | { | |
2243 | return 0; | |
2244 | } | |
2245 | ||
fce205e9 LT |
2246 | static inline int locks_mandatory_area(struct inode *inode, struct file *filp, |
2247 | loff_t start, loff_t end, unsigned char type) | |
9e8925b6 JL |
2248 | { |
2249 | return 0; | |
2250 | } | |
2251 | ||
2252 | static inline int __mandatory_lock(struct inode *inode) | |
2253 | { | |
2254 | return 0; | |
2255 | } | |
2256 | ||
2257 | static inline int mandatory_lock(struct inode *inode) | |
2258 | { | |
2259 | return 0; | |
2260 | } | |
2261 | ||
2262 | static inline int locks_verify_locked(struct file *file) | |
2263 | { | |
2264 | return 0; | |
2265 | } | |
2266 | ||
2267 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
2268 | size_t size) | |
2269 | { | |
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | #endif /* CONFIG_MANDATORY_FILE_LOCKING */ | |
2274 | ||
2275 | ||
2276 | #ifdef CONFIG_FILE_LOCKING | |
1da177e4 LT |
2277 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2278 | { | |
24cbe784 JL |
2279 | /* |
2280 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2281 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2282 | * could end up racing with tasks trying to set a new lease on this | |
2283 | * file. | |
24cbe784 JL |
2284 | */ |
2285 | smp_mb(); | |
8634b51f | 2286 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2287 | return __break_lease(inode, mode, FL_LEASE); |
1da177e4 LT |
2288 | return 0; |
2289 | } | |
df4e8d2c BF |
2290 | |
2291 | static inline int break_deleg(struct inode *inode, unsigned int mode) | |
2292 | { | |
962bd40b JL |
2293 | /* |
2294 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2295 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2296 | * could end up racing with tasks trying to set a new lease on this | |
2297 | * file. | |
962bd40b JL |
2298 | */ |
2299 | smp_mb(); | |
8634b51f | 2300 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2301 | return __break_lease(inode, mode, FL_DELEG); |
1da177e4 LT |
2302 | return 0; |
2303 | } | |
df4e8d2c | 2304 | |
5a14696c BF |
2305 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2306 | { | |
2307 | int ret; | |
2308 | ||
2309 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); | |
2310 | if (ret == -EWOULDBLOCK && delegated_inode) { | |
2311 | *delegated_inode = inode; | |
2312 | ihold(inode); | |
2313 | } | |
2314 | return ret; | |
2315 | } | |
2316 | ||
2317 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2318 | { | |
2319 | int ret; | |
2320 | ||
2321 | ret = break_deleg(*delegated_inode, O_WRONLY); | |
2322 | iput(*delegated_inode); | |
2323 | *delegated_inode = NULL; | |
2324 | return ret; | |
2325 | } | |
2326 | ||
11afe9f7 CH |
2327 | static inline int break_layout(struct inode *inode, bool wait) |
2328 | { | |
2329 | smp_mb(); | |
2330 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) | |
2331 | return __break_lease(inode, | |
2332 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, | |
2333 | FL_LAYOUT); | |
2334 | return 0; | |
2335 | } | |
2336 | ||
bfcd17a6 | 2337 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
2338 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2339 | { | |
2340 | return 0; | |
2341 | } | |
2342 | ||
df4e8d2c BF |
2343 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2344 | { | |
2345 | return 0; | |
2346 | } | |
5a14696c BF |
2347 | |
2348 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) | |
2349 | { | |
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2354 | { | |
2355 | BUG(); | |
2356 | return 0; | |
2357 | } | |
2358 | ||
11afe9f7 CH |
2359 | static inline int break_layout(struct inode *inode, bool wait) |
2360 | { | |
2361 | return 0; | |
2362 | } | |
2363 | ||
bfcd17a6 | 2364 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2365 | |
2366 | /* fs/open.c */ | |
adb5c247 | 2367 | struct audit_names; |
91a27b2a | 2368 | struct filename { |
adb5c247 JL |
2369 | const char *name; /* pointer to actual string */ |
2370 | const __user char *uptr; /* original userland pointer */ | |
2371 | struct audit_names *aname; | |
55422d0b | 2372 | int refcnt; |
fd2f7cb5 | 2373 | const char iname[]; |
91a27b2a | 2374 | }; |
1da177e4 | 2375 | |
7df818b2 | 2376 | extern long vfs_truncate(const struct path *, loff_t); |
4a30131e N |
2377 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2378 | struct file *filp); | |
72c72bdf | 2379 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
3e63cbb1 | 2380 | loff_t len); |
8e8a1407 | 2381 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd | 2382 | umode_t mode); |
669abf4e | 2383 | extern struct file *file_open_name(struct filename *, int, umode_t); |
a218d0fd | 2384 | extern struct file *filp_open(const char *, int, umode_t); |
73d049a4 | 2385 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
378c6520 | 2386 | const char *, int, umode_t); |
765927b2 | 2387 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
1da177e4 | 2388 | extern int filp_close(struct file *, fl_owner_t id); |
91a27b2a | 2389 | |
51f39a1f | 2390 | extern struct filename *getname_flags(const char __user *, int, int *); |
91a27b2a | 2391 | extern struct filename *getname(const char __user *); |
c4ad8f98 | 2392 | extern struct filename *getname_kernel(const char *); |
55422d0b | 2393 | extern void putname(struct filename *name); |
91a27b2a | 2394 | |
47237687 AV |
2395 | enum { |
2396 | FILE_CREATED = 1, | |
2397 | FILE_OPENED = 2 | |
2398 | }; | |
30d90494 AV |
2399 | extern int finish_open(struct file *file, struct dentry *dentry, |
2400 | int (*open)(struct inode *, struct file *), | |
2401 | int *opened); | |
e45198a6 | 2402 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
1da177e4 | 2403 | |
3e63cbb1 AJ |
2404 | /* fs/ioctl.c */ |
2405 | ||
2406 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2407 | ||
1da177e4 LT |
2408 | /* fs/dcache.c */ |
2409 | extern void __init vfs_caches_init_early(void); | |
4248b0da | 2410 | extern void __init vfs_caches_init(void); |
1da177e4 | 2411 | |
b86c089b CL |
2412 | extern struct kmem_cache *names_cachep; |
2413 | ||
a608ca21 | 2414 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
3446a8aa | 2415 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1da177e4 | 2416 | |
9361401e | 2417 | #ifdef CONFIG_BLOCK |
1da177e4 | 2418 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2419 | extern void unregister_blkdev(unsigned int, const char *); |
f44f1ab5 | 2420 | extern void bdev_unhash_inode(dev_t dev); |
1da177e4 | 2421 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2422 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 LT |
2423 | extern void bd_set_size(struct block_device *, loff_t size); |
2424 | extern void bd_forget(struct inode *inode); | |
2425 | extern void bdput(struct block_device *); | |
585d3bc0 | 2426 | extern void invalidate_bdev(struct block_device *); |
5c0d6b60 | 2427 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
585d3bc0 | 2428 | extern int sync_blockdev(struct block_device *bdev); |
ff01bb48 | 2429 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2430 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2431 | extern void emergency_thaw_all(void); |
585d3bc0 NP |
2432 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2433 | extern int fsync_bdev(struct block_device *); | |
a212b105 TH |
2434 | |
2435 | extern struct super_block *blockdev_superblock; | |
2436 | ||
2437 | static inline bool sb_is_blkdev_sb(struct super_block *sb) | |
2438 | { | |
2439 | return sb == blockdev_superblock; | |
2440 | } | |
9361401e DH |
2441 | #else |
2442 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2443 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2444 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2445 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2446 | ||
2447 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2448 | { | |
2449 | return NULL; | |
2450 | } | |
2451 | ||
2452 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2453 | { | |
2454 | return 0; | |
2455 | } | |
5c0d6b60 JK |
2456 | |
2457 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) | |
2458 | { | |
2459 | } | |
a8855990 | 2460 | |
3e004eea | 2461 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a8855990 | 2462 | { |
3e004eea | 2463 | return false; |
a8855990 | 2464 | } |
9361401e | 2465 | #endif |
60b0680f | 2466 | extern int sync_filesystem(struct super_block *); |
9361401e | 2467 | extern const struct file_operations def_blk_fops; |
4b6f5d20 | 2468 | extern const struct file_operations def_chr_fops; |
9361401e | 2469 | #ifdef CONFIG_BLOCK |
1da177e4 | 2470 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2471 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2472 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2473 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2474 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2475 | void *holder); | |
2476 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2477 | void *holder); | |
4385bab1 | 2478 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
be324177 JW |
2479 | extern int __blkdev_reread_part(struct block_device *bdev); |
2480 | extern int blkdev_reread_part(struct block_device *bdev); | |
2481 | ||
641dc636 | 2482 | #ifdef CONFIG_SYSFS |
e09b457b | 2483 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2484 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2485 | struct gendisk *disk); | |
641dc636 | 2486 | #else |
e09b457b TH |
2487 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2488 | struct gendisk *disk) | |
2489 | { | |
2490 | return 0; | |
2491 | } | |
49731baa TH |
2492 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2493 | struct gendisk *disk) | |
2494 | { | |
2495 | } | |
641dc636 | 2496 | #endif |
9361401e | 2497 | #endif |
1da177e4 LT |
2498 | |
2499 | /* fs/char_dev.c */ | |
8a932f73 | 2500 | #define CHRDEV_MAJOR_MAX 512 |
49db08c3 LW |
2501 | /* Marks the bottom of the first segment of free char majors */ |
2502 | #define CHRDEV_MAJOR_DYN_END 234 | |
a5d31a3f LG |
2503 | /* Marks the top and bottom of the second segment of free char majors */ |
2504 | #define CHRDEV_MAJOR_DYN_EXT_START 511 | |
2505 | #define CHRDEV_MAJOR_DYN_EXT_END 384 | |
2506 | ||
1da177e4 LT |
2507 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2508 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2509 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2510 | unsigned int count, const char *name, | |
2511 | const struct file_operations *fops); | |
2512 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2513 | unsigned int count, const char *name); | |
1da177e4 | 2514 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2515 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2516 | |
1905b1bf TH |
2517 | static inline int register_chrdev(unsigned int major, const char *name, |
2518 | const struct file_operations *fops) | |
2519 | { | |
2520 | return __register_chrdev(major, 0, 256, name, fops); | |
2521 | } | |
2522 | ||
2523 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2524 | { | |
2525 | __unregister_chrdev(major, 0, 256, name); | |
2526 | } | |
2527 | ||
1da177e4 LT |
2528 | /* fs/block_dev.c */ |
2529 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2530 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2531 | |
2532 | #ifdef CONFIG_BLOCK | |
133d55cd | 2533 | #define BLKDEV_MAJOR_MAX 512 |
1da177e4 LT |
2534 | extern const char *__bdevname(dev_t, char *buffer); |
2535 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2536 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2537 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2538 | |
9361401e | 2539 | #else |
133d55cd | 2540 | #define BLKDEV_MAJOR_MAX 0 |
9361401e | 2541 | #endif |
1da177e4 LT |
2542 | |
2543 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2544 | ||
2545 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2546 | extern void make_bad_inode(struct inode *); | |
0e3ef1fe | 2547 | extern bool is_bad_inode(struct inode *); |
1da177e4 | 2548 | |
c11f0c0b | 2549 | #ifdef CONFIG_BLOCK |
c3279d14 AP |
2550 | extern void check_disk_size_change(struct gendisk *disk, |
2551 | struct block_device *bdev); | |
0c002c2f | 2552 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2553 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2554 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2555 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2556 | #endif |
1da177e4 LT |
2557 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2558 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2559 | |
1da177e4 LT |
2560 | static inline void invalidate_remote_inode(struct inode *inode) |
2561 | { | |
2562 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2563 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2564 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2565 | } |
2566 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2567 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2568 | pgoff_t start, pgoff_t end); | |
2569 | extern int write_inode_now(struct inode *, int); | |
2570 | extern int filemap_fdatawrite(struct address_space *); | |
2571 | extern int filemap_flush(struct address_space *); | |
76341cab | 2572 | extern int filemap_fdatawait_keep_errors(struct address_space *mapping); |
d3bccb6f JK |
2573 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2574 | loff_t lend); | |
ffb959bb JL |
2575 | |
2576 | static inline int filemap_fdatawait(struct address_space *mapping) | |
2577 | { | |
2578 | return filemap_fdatawait_range(mapping, 0, LLONG_MAX); | |
2579 | } | |
2580 | ||
7fc9e472 GR |
2581 | extern bool filemap_range_has_page(struct address_space *, loff_t lstart, |
2582 | loff_t lend); | |
a823e458 JL |
2583 | extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, |
2584 | loff_t lend); | |
1da177e4 LT |
2585 | extern int filemap_write_and_wait(struct address_space *mapping); |
2586 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2587 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2588 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2589 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2590 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2591 | loff_t start, loff_t end); | |
d72d9e2a | 2592 | extern int filemap_check_errors(struct address_space *mapping); |
5660e13d | 2593 | extern void __filemap_set_wb_err(struct address_space *mapping, int err); |
a823e458 JL |
2594 | |
2595 | extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, | |
2596 | loff_t lend); | |
5660e13d JL |
2597 | extern int __must_check file_check_and_advance_wb_err(struct file *file); |
2598 | extern int __must_check file_write_and_wait_range(struct file *file, | |
2599 | loff_t start, loff_t end); | |
2600 | ||
a823e458 JL |
2601 | static inline int file_write_and_wait(struct file *file) |
2602 | { | |
2603 | return file_write_and_wait_range(file, 0, LLONG_MAX); | |
2604 | } | |
2605 | ||
5660e13d JL |
2606 | /** |
2607 | * filemap_set_wb_err - set a writeback error on an address_space | |
2608 | * @mapping: mapping in which to set writeback error | |
2609 | * @err: error to be set in mapping | |
2610 | * | |
2611 | * When writeback fails in some way, we must record that error so that | |
2612 | * userspace can be informed when fsync and the like are called. We endeavor | |
2613 | * to report errors on any file that was open at the time of the error. Some | |
2614 | * internal callers also need to know when writeback errors have occurred. | |
2615 | * | |
2616 | * When a writeback error occurs, most filesystems will want to call | |
2617 | * filemap_set_wb_err to record the error in the mapping so that it will be | |
2618 | * automatically reported whenever fsync is called on the file. | |
5660e13d JL |
2619 | */ |
2620 | static inline void filemap_set_wb_err(struct address_space *mapping, int err) | |
2621 | { | |
2622 | /* Fastpath for common case of no error */ | |
2623 | if (unlikely(err)) | |
2624 | __filemap_set_wb_err(mapping, err); | |
2625 | } | |
2626 | ||
2627 | /** | |
2628 | * filemap_check_wb_error - has an error occurred since the mark was sampled? | |
2629 | * @mapping: mapping to check for writeback errors | |
2630 | * @since: previously-sampled errseq_t | |
2631 | * | |
2632 | * Grab the errseq_t value from the mapping, and see if it has changed "since" | |
2633 | * the given value was sampled. | |
2634 | * | |
2635 | * If it has then report the latest error set, otherwise return 0. | |
2636 | */ | |
2637 | static inline int filemap_check_wb_err(struct address_space *mapping, | |
2638 | errseq_t since) | |
2639 | { | |
2640 | return errseq_check(&mapping->wb_err, since); | |
2641 | } | |
2642 | ||
2643 | /** | |
2644 | * filemap_sample_wb_err - sample the current errseq_t to test for later errors | |
2645 | * @mapping: mapping to be sampled | |
2646 | * | |
2647 | * Writeback errors are always reported relative to a particular sample point | |
2648 | * in the past. This function provides those sample points. | |
2649 | */ | |
2650 | static inline errseq_t filemap_sample_wb_err(struct address_space *mapping) | |
2651 | { | |
2652 | return errseq_sample(&mapping->wb_err); | |
2653 | } | |
2654 | ||
8018ab05 CH |
2655 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2656 | int datasync); | |
2657 | extern int vfs_fsync(struct file *file, int datasync); | |
e2592217 CH |
2658 | |
2659 | /* | |
2660 | * Sync the bytes written if this was a synchronous write. Expect ki_pos | |
2661 | * to already be updated for the write, and will return either the amount | |
2662 | * of bytes passed in, or an error if syncing the file failed. | |
2663 | */ | |
2664 | static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) | |
2665 | { | |
2666 | if (iocb->ki_flags & IOCB_DSYNC) { | |
2667 | int ret = vfs_fsync_range(iocb->ki_filp, | |
2668 | iocb->ki_pos - count, iocb->ki_pos - 1, | |
2669 | (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); | |
2670 | if (ret) | |
2671 | return ret; | |
2672 | } | |
2673 | ||
2674 | return count; | |
d311d79d | 2675 | } |
e2592217 | 2676 | |
1da177e4 LT |
2677 | extern void emergency_sync(void); |
2678 | extern void emergency_remount(void); | |
9361401e | 2679 | #ifdef CONFIG_BLOCK |
1da177e4 | 2680 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2681 | #endif |
27ac0ffe | 2682 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
f419a2e3 | 2683 | extern int inode_permission(struct inode *, int); |
bd5d0856 | 2684 | extern int __inode_permission(struct inode *, int); |
2830ba7f | 2685 | extern int generic_permission(struct inode *, int); |
cbdf35bc | 2686 | extern int __check_sticky(struct inode *dir, struct inode *inode); |
1da177e4 | 2687 | |
f696a365 MS |
2688 | static inline bool execute_ok(struct inode *inode) |
2689 | { | |
2690 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2691 | } | |
2692 | ||
8d71db4f AV |
2693 | static inline void file_start_write(struct file *file) |
2694 | { | |
2695 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2696 | return; | |
2697 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); | |
2698 | } | |
2699 | ||
5ae98f15 JK |
2700 | static inline bool file_start_write_trylock(struct file *file) |
2701 | { | |
2702 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2703 | return true; | |
2704 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); | |
2705 | } | |
2706 | ||
8d71db4f AV |
2707 | static inline void file_end_write(struct file *file) |
2708 | { | |
2709 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2710 | return; | |
2711 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); | |
2712 | } | |
2713 | ||
bfe219d3 AG |
2714 | static inline int do_clone_file_range(struct file *file_in, loff_t pos_in, |
2715 | struct file *file_out, loff_t pos_out, | |
2716 | u64 len) | |
2717 | { | |
2718 | int ret; | |
2719 | ||
2720 | file_start_write(file_out); | |
2721 | ret = vfs_clone_file_range(file_in, pos_in, file_out, pos_out, len); | |
2722 | file_end_write(file_out); | |
2723 | ||
2724 | return ret; | |
2725 | } | |
2726 | ||
07b8ce1e AV |
2727 | /* |
2728 | * get_write_access() gets write permission for a file. | |
2729 | * put_write_access() releases this write permission. | |
2730 | * This is used for regular files. | |
2731 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2732 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2733 | * can have the following values: | |
2734 | * 0: no writers, no VM_DENYWRITE mappings | |
2735 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2736 | * > 0: (i_writecount) users are writing to the file. | |
2737 | * | |
2738 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2739 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2740 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2741 | * to do the change if sign is wrong. | |
2742 | */ | |
2743 | static inline int get_write_access(struct inode *inode) | |
2744 | { | |
2745 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2746 | } | |
2747 | static inline int deny_write_access(struct file *file) | |
2748 | { | |
496ad9aa | 2749 | struct inode *inode = file_inode(file); |
07b8ce1e AV |
2750 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2751 | } | |
1da177e4 LT |
2752 | static inline void put_write_access(struct inode * inode) |
2753 | { | |
2754 | atomic_dec(&inode->i_writecount); | |
2755 | } | |
2756 | static inline void allow_write_access(struct file *file) | |
2757 | { | |
2758 | if (file) | |
496ad9aa | 2759 | atomic_inc(&file_inode(file)->i_writecount); |
1da177e4 | 2760 | } |
f1fe29b4 DH |
2761 | static inline bool inode_is_open_for_write(const struct inode *inode) |
2762 | { | |
2763 | return atomic_read(&inode->i_writecount) > 0; | |
2764 | } | |
2765 | ||
a5c96ebf MZ |
2766 | #ifdef CONFIG_IMA |
2767 | static inline void i_readcount_dec(struct inode *inode) | |
2768 | { | |
2769 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2770 | atomic_dec(&inode->i_readcount); | |
2771 | } | |
2772 | static inline void i_readcount_inc(struct inode *inode) | |
2773 | { | |
2774 | atomic_inc(&inode->i_readcount); | |
2775 | } | |
2776 | #else | |
2777 | static inline void i_readcount_dec(struct inode *inode) | |
2778 | { | |
2779 | return; | |
2780 | } | |
2781 | static inline void i_readcount_inc(struct inode *inode) | |
2782 | { | |
2783 | return; | |
2784 | } | |
2785 | #endif | |
ed8cae8b | 2786 | extern int do_pipe_flags(int *, int); |
1da177e4 | 2787 | |
1284ab5b MZ |
2788 | #define __kernel_read_file_id(id) \ |
2789 | id(UNKNOWN, unknown) \ | |
2790 | id(FIRMWARE, firmware) \ | |
a098ecd2 | 2791 | id(FIRMWARE_PREALLOC_BUFFER, firmware) \ |
1284ab5b MZ |
2792 | id(MODULE, kernel-module) \ |
2793 | id(KEXEC_IMAGE, kexec-image) \ | |
2794 | id(KEXEC_INITRAMFS, kexec-initramfs) \ | |
2795 | id(POLICY, security-policy) \ | |
a7d3d039 | 2796 | id(X509_CERTIFICATE, x509-certificate) \ |
1284ab5b MZ |
2797 | id(MAX_ID, ) |
2798 | ||
2799 | #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, | |
2800 | #define __fid_stringify(dummy, str) #str, | |
2801 | ||
bc8ca5b9 | 2802 | enum kernel_read_file_id { |
1284ab5b MZ |
2803 | __kernel_read_file_id(__fid_enumify) |
2804 | }; | |
2805 | ||
2806 | static const char * const kernel_read_file_str[] = { | |
2807 | __kernel_read_file_id(__fid_stringify) | |
bc8ca5b9 MZ |
2808 | }; |
2809 | ||
da20dfe6 | 2810 | static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) |
1284ab5b | 2811 | { |
cbfd0c10 | 2812 | if ((unsigned)id >= READING_MAX_ID) |
1284ab5b MZ |
2813 | return kernel_read_file_str[READING_UNKNOWN]; |
2814 | ||
2815 | return kernel_read_file_str[id]; | |
2816 | } | |
2817 | ||
bc8ca5b9 MZ |
2818 | extern int kernel_read_file(struct file *, void **, loff_t *, loff_t, |
2819 | enum kernel_read_file_id); | |
711aab1d | 2820 | extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t, |
09596b94 | 2821 | enum kernel_read_file_id); |
b844f0ec MZ |
2822 | extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t, |
2823 | enum kernel_read_file_id); | |
bdd1d2d3 | 2824 | extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *); |
e13ec939 | 2825 | extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *); |
73e18f7c | 2826 | extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *); |
1da177e4 LT |
2827 | extern struct file * open_exec(const char *); |
2828 | ||
2829 | /* fs/dcache.c -- generic fs support functions */ | |
a6e5787f | 2830 | extern bool is_subdir(struct dentry *, struct dentry *); |
640eb7e7 | 2831 | extern bool path_is_under(const struct path *, const struct path *); |
1da177e4 | 2832 | |
9bf39ab2 MS |
2833 | extern char *file_path(struct file *, char *, int); |
2834 | ||
1da177e4 LT |
2835 | #include <linux/err.h> |
2836 | ||
2837 | /* needed for stackable file system support */ | |
965c8e59 | 2838 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2839 | |
965c8e59 | 2840 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2841 | |
54e34621 | 2842 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2843 | extern void inode_init_once(struct inode *); |
2aa15890 | 2844 | extern void address_space_init_once(struct address_space *mapping); |
1da177e4 LT |
2845 | extern struct inode * igrab(struct inode *); |
2846 | extern ino_t iunique(struct super_block *, ino_t); | |
2847 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2848 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2849 | static inline int generic_drop_inode(struct inode *inode) |
2850 | { | |
2851 | return !inode->i_nlink || inode_unhashed(inode); | |
2852 | } | |
1da177e4 | 2853 | |
88bd5121 AA |
2854 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2855 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2856 | void *data); | |
1da177e4 LT |
2857 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2858 | int (*test)(struct inode *, void *), void *data); | |
2859 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2860 | ||
2861 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
2862 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
fe032c42 TT |
2863 | extern struct inode *find_inode_nowait(struct super_block *, |
2864 | unsigned long, | |
2865 | int (*match)(struct inode *, | |
2866 | unsigned long, void *), | |
2867 | void *data); | |
261bca86 AV |
2868 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2869 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
2870 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2871 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
2872 | #else | |
2873 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
2874 | #endif | |
1da177e4 | 2875 | extern void unlock_new_inode(struct inode *); |
85fe4025 | 2876 | extern unsigned int get_next_ino(void); |
799ea9e9 | 2877 | extern void evict_inodes(struct super_block *sb); |
1da177e4 | 2878 | |
1da177e4 | 2879 | extern void __iget(struct inode * inode); |
b46980fe | 2880 | extern void iget_failed(struct inode *); |
dbd5768f | 2881 | extern void clear_inode(struct inode *); |
2e00c97e | 2882 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
2883 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2884 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 2885 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 2886 | extern int should_remove_suid(struct dentry *); |
5fa8e0a1 | 2887 | extern int file_remove_privs(struct file *); |
1da177e4 LT |
2888 | |
2889 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
2890 | static inline void insert_inode_hash(struct inode *inode) |
2891 | { | |
1da177e4 LT |
2892 | __insert_inode_hash(inode, inode->i_ino); |
2893 | } | |
f2ee7abf ED |
2894 | |
2895 | extern void __remove_inode_hash(struct inode *); | |
2896 | static inline void remove_inode_hash(struct inode *inode) | |
2897 | { | |
cbedaac6 | 2898 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
f2ee7abf ED |
2899 | __remove_inode_hash(inode); |
2900 | } | |
2901 | ||
646ec461 | 2902 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 2903 | |
9361401e | 2904 | #ifdef CONFIG_BLOCK |
1da177e4 | 2905 | extern int bdev_read_only(struct block_device *); |
9361401e | 2906 | #endif |
1da177e4 LT |
2907 | extern int set_blocksize(struct block_device *, int); |
2908 | extern int sb_set_blocksize(struct super_block *, int); | |
2909 | extern int sb_min_blocksize(struct super_block *, int); | |
2910 | ||
2911 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
2912 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
3309dd04 | 2913 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
ed978a81 | 2914 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2915 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2916 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
1af5bb49 | 2917 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *); |
3b93f911 | 2918 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
88e6faef | 2919 | |
18e9710e | 2920 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, |
ddef7ed2 | 2921 | rwf_t flags); |
abbb6589 | 2922 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, |
ddef7ed2 | 2923 | rwf_t flags); |
dbe4e192 | 2924 | |
eef99380 | 2925 | /* fs/block_dev.c */ |
b2de525f | 2926 | extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
1456c0a8 | 2927 | extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
02c24a82 JB |
2928 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2929 | int datasync); | |
ff01bb48 | 2930 | extern void block_sync_page(struct page *page); |
eef99380 | 2931 | |
88e6faef | 2932 | /* fs/splice.c */ |
cbb7e577 | 2933 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 2934 | struct pipe_inode_info *, size_t, unsigned int); |
8d020765 | 2935 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 2936 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 2937 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 | 2938 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1c118596 MS |
2939 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
2940 | loff_t *opos, size_t len, unsigned int flags); | |
2941 | ||
88e6faef | 2942 | |
1da177e4 LT |
2943 | extern void |
2944 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
965c8e59 AM |
2945 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
2946 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); | |
46a1c2c7 | 2947 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
965c8e59 | 2948 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
5760495a | 2949 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
965c8e59 | 2950 | int whence, loff_t maxsize, loff_t eof); |
1bf9d14d AV |
2951 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
2952 | int whence, loff_t size); | |
b25472f9 AV |
2953 | extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t); |
2954 | extern loff_t no_seek_end_llseek(struct file *, loff_t, int); | |
1da177e4 LT |
2955 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2956 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
2957 | ||
9361401e | 2958 | #ifdef CONFIG_BLOCK |
8a4c1e42 | 2959 | typedef void (dio_submit_t)(struct bio *bio, struct inode *inode, |
facd07b0 | 2960 | loff_t file_offset); |
1da177e4 LT |
2961 | |
2962 | enum { | |
1e431f5c CH |
2963 | /* need locking between buffered and direct access */ |
2964 | DIO_LOCKING = 0x01, | |
2965 | ||
2966 | /* filesystem does not support filling holes */ | |
2967 | DIO_SKIP_HOLES = 0x02, | |
60392573 CH |
2968 | |
2969 | /* filesystem can handle aio writes beyond i_size */ | |
2970 | DIO_ASYNC_EXTEND = 0x04, | |
fe0f07d0 JA |
2971 | |
2972 | /* inode/fs/bdev does not need truncate protection */ | |
2973 | DIO_SKIP_DIO_COUNT = 0x08, | |
1da177e4 LT |
2974 | }; |
2975 | ||
4055351c | 2976 | void dio_end_io(struct bio *bio); |
eafdc7d1 | 2977 | |
17f8c842 OS |
2978 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
2979 | struct block_device *bdev, struct iov_iter *iter, | |
c8b8e32d | 2980 | get_block_t get_block, |
17f8c842 OS |
2981 | dio_iodone_t end_io, dio_submit_t submit_io, |
2982 | int flags); | |
7bb46a67 | 2983 | |
17f8c842 OS |
2984 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
2985 | struct inode *inode, | |
c8b8e32d | 2986 | struct iov_iter *iter, |
17f8c842 | 2987 | get_block_t get_block) |
1da177e4 | 2988 | { |
17f8c842 | 2989 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 2990 | get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 2991 | } |
9361401e | 2992 | #endif |
1da177e4 | 2993 | |
1d59d61f | 2994 | void inode_dio_wait(struct inode *inode); |
fe0f07d0 JA |
2995 | |
2996 | /* | |
2997 | * inode_dio_begin - signal start of a direct I/O requests | |
2998 | * @inode: inode the direct I/O happens on | |
2999 | * | |
3000 | * This is called once we've finished processing a direct I/O request, | |
3001 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
3002 | */ | |
3003 | static inline void inode_dio_begin(struct inode *inode) | |
3004 | { | |
3005 | atomic_inc(&inode->i_dio_count); | |
3006 | } | |
3007 | ||
3008 | /* | |
3009 | * inode_dio_end - signal finish of a direct I/O requests | |
3010 | * @inode: inode the direct I/O happens on | |
3011 | * | |
3012 | * This is called once we've finished processing a direct I/O request, | |
3013 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
3014 | */ | |
3015 | static inline void inode_dio_end(struct inode *inode) | |
3016 | { | |
3017 | if (atomic_dec_and_test(&inode->i_dio_count)) | |
3018 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); | |
3019 | } | |
1d59d61f | 3020 | |
5f16f322 TT |
3021 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
3022 | unsigned int mask); | |
3023 | ||
4b6f5d20 | 3024 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
3025 | |
3026 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
3027 | ||
5d826c84 | 3028 | extern int readlink_copy(char __user *, int, const char *); |
1da177e4 | 3029 | extern int page_readlink(struct dentry *, char __user *, int); |
fceef393 AV |
3030 | extern const char *page_get_link(struct dentry *, struct inode *, |
3031 | struct delayed_call *); | |
3032 | extern void page_put_link(void *); | |
0adb25d2 | 3033 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 3034 | int nofs); |
1da177e4 | 3035 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 3036 | extern const struct inode_operations page_symlink_inode_operations; |
fceef393 | 3037 | extern void kfree_link(void *); |
1da177e4 | 3038 | extern void generic_fillattr(struct inode *, struct kstat *); |
a528d35e DH |
3039 | extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int); |
3040 | extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int); | |
b462707e | 3041 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 3042 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
1c8924eb | 3043 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 3044 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
f4a8116a JK |
3045 | static inline loff_t __inode_get_bytes(struct inode *inode) |
3046 | { | |
3047 | return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; | |
3048 | } | |
1da177e4 LT |
3049 | loff_t inode_get_bytes(struct inode *inode); |
3050 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
fceef393 AV |
3051 | const char *simple_get_link(struct dentry *, struct inode *, |
3052 | struct delayed_call *); | |
61ba64fc | 3053 | extern const struct inode_operations simple_symlink_inode_operations; |
1da177e4 | 3054 | |
5c0ba4e0 | 3055 | extern int iterate_dir(struct file *, struct dir_context *); |
1da177e4 | 3056 | |
a528d35e DH |
3057 | extern int vfs_statx(int, const char __user *, int, struct kstat *, u32); |
3058 | extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int); | |
3059 | ||
3060 | static inline int vfs_stat(const char __user *filename, struct kstat *stat) | |
3061 | { | |
deccf497 DH |
3062 | return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT, |
3063 | stat, STATX_BASIC_STATS); | |
a528d35e DH |
3064 | } |
3065 | static inline int vfs_lstat(const char __user *name, struct kstat *stat) | |
3066 | { | |
deccf497 | 3067 | return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT, |
a528d35e DH |
3068 | stat, STATX_BASIC_STATS); |
3069 | } | |
3070 | static inline int vfs_fstatat(int dfd, const char __user *filename, | |
3071 | struct kstat *stat, int flags) | |
3072 | { | |
42f46148 | 3073 | return vfs_statx(dfd, filename, flags, stat, STATX_BASIC_STATS); |
a528d35e DH |
3074 | } |
3075 | static inline int vfs_fstat(int fd, struct kstat *stat) | |
3076 | { | |
3077 | return vfs_statx_fd(fd, stat, STATX_BASIC_STATS, 0); | |
3078 | } | |
3079 | ||
3080 | ||
d60874cd | 3081 | extern const char *vfs_get_link(struct dentry *, struct delayed_call *); |
fd4a0edf | 3082 | extern int vfs_readlink(struct dentry *, char __user *, int); |
1da177e4 | 3083 | |
e9079cce | 3084 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
3085 | struct fiemap_extent_info *fieinfo, |
3086 | loff_t start, loff_t len, | |
3087 | get_block_t *get_block); | |
68c9d702 JB |
3088 | extern int generic_block_fiemap(struct inode *inode, |
3089 | struct fiemap_extent_info *fieinfo, u64 start, | |
3090 | u64 len, get_block_t *get_block); | |
1da177e4 | 3091 | |
ee416bcd | 3092 | extern struct file_system_type *get_filesystem(struct file_system_type *fs); |
c18479fe | 3093 | extern void put_filesystem(struct file_system_type *fs); |
1da177e4 LT |
3094 | extern struct file_system_type *get_fs_type(const char *name); |
3095 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 3096 | extern struct super_block *get_super_thawed(struct block_device *); |
ba6379f7 | 3097 | extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev); |
4504230a | 3098 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 3099 | extern void drop_super(struct super_block *sb); |
ba6379f7 | 3100 | extern void drop_super_exclusive(struct super_block *sb); |
01a05b33 | 3101 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
3102 | extern void iterate_supers_type(struct file_system_type *, |
3103 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
3104 | |
3105 | extern int dcache_dir_open(struct inode *, struct file *); | |
3106 | extern int dcache_dir_close(struct inode *, struct file *); | |
3107 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
5f99f4e7 | 3108 | extern int dcache_readdir(struct file *, struct dir_context *); |
7bb46a67 | 3109 | extern int simple_setattr(struct dentry *, struct iattr *); |
a528d35e | 3110 | extern int simple_getattr(const struct path *, struct kstat *, u32, unsigned int); |
726c3342 | 3111 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
20955e89 | 3112 | extern int simple_open(struct inode *inode, struct file *file); |
1da177e4 LT |
3113 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
3114 | extern int simple_unlink(struct inode *, struct dentry *); | |
3115 | extern int simple_rmdir(struct inode *, struct dentry *); | |
e0e0be8a MS |
3116 | extern int simple_rename(struct inode *, struct dentry *, |
3117 | struct inode *, struct dentry *, unsigned int); | |
02c24a82 | 3118 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
3119 | extern int simple_empty(struct dentry *); |
3120 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
3121 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
3122 | loff_t pos, unsigned len, unsigned flags, | |
3123 | struct page **pagep, void **fsdata); | |
3124 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
3125 | loff_t pos, unsigned len, unsigned copied, | |
3126 | struct page *page, void *fsdata); | |
b26d4cd3 | 3127 | extern int always_delete_dentry(const struct dentry *); |
6987843f | 3128 | extern struct inode *alloc_anon_inode(struct super_block *); |
e6f5c789 | 3129 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
b26d4cd3 | 3130 | extern const struct dentry_operations simple_dentry_operations; |
1da177e4 | 3131 | |
00cd8dd3 | 3132 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
1da177e4 | 3133 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
4b6f5d20 | 3134 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 3135 | extern const struct inode_operations simple_dir_inode_operations; |
fbabfd0f EB |
3136 | extern void make_empty_dir_inode(struct inode *inode); |
3137 | extern bool is_empty_dir_inode(struct inode *inode); | |
cda37124 | 3138 | struct tree_descr { const char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 3139 | struct dentry *d_alloc_name(struct dentry *, const char *); |
cda37124 EB |
3140 | extern int simple_fill_super(struct super_block *, unsigned long, |
3141 | const struct tree_descr *); | |
1f5ce9e9 | 3142 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
3143 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
3144 | ||
93b07113 AM |
3145 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
3146 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
3147 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
3148 | const void __user *from, size_t count); | |
1da177e4 | 3149 | |
ac13a829 | 3150 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
02c24a82 | 3151 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 3152 | |
30ca22c7 PL |
3153 | extern int generic_check_addressable(unsigned, u64); |
3154 | ||
e965f963 | 3155 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 3156 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
3157 | struct page *, struct page *, |
3158 | enum migrate_mode); | |
e965f963 CL |
3159 | #else |
3160 | #define buffer_migrate_page NULL | |
3161 | #endif | |
3162 | ||
31051c85 | 3163 | extern int setattr_prepare(struct dentry *, struct iattr *); |
25d9e2d1 | 3164 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
6a1a90ad | 3165 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 3166 | |
c3b2da31 | 3167 | extern int file_update_time(struct file *file); |
1da177e4 | 3168 | |
d475c634 MW |
3169 | static inline bool io_is_direct(struct file *filp) |
3170 | { | |
65f87ee7 | 3171 | return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host); |
d475c634 MW |
3172 | } |
3173 | ||
baabda26 DW |
3174 | static inline bool vma_is_dax(struct vm_area_struct *vma) |
3175 | { | |
3176 | return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); | |
3177 | } | |
3178 | ||
2ba48ce5 AV |
3179 | static inline int iocb_flags(struct file *file) |
3180 | { | |
3181 | int res = 0; | |
3182 | if (file->f_flags & O_APPEND) | |
3183 | res |= IOCB_APPEND; | |
3184 | if (io_is_direct(file)) | |
3185 | res |= IOCB_DIRECT; | |
dde0c2e7 CH |
3186 | if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) |
3187 | res |= IOCB_DSYNC; | |
3188 | if (file->f_flags & __O_SYNC) | |
3189 | res |= IOCB_SYNC; | |
2ba48ce5 AV |
3190 | return res; |
3191 | } | |
3192 | ||
ddef7ed2 | 3193 | static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) |
fdd2f5b7 GR |
3194 | { |
3195 | if (unlikely(flags & ~RWF_SUPPORTED)) | |
3196 | return -EOPNOTSUPP; | |
3197 | ||
b745fafa | 3198 | if (flags & RWF_NOWAIT) { |
91f9943e | 3199 | if (!(ki->ki_filp->f_mode & FMODE_NOWAIT)) |
b745fafa GR |
3200 | return -EOPNOTSUPP; |
3201 | ki->ki_flags |= IOCB_NOWAIT; | |
3202 | } | |
fdd2f5b7 GR |
3203 | if (flags & RWF_HIPRI) |
3204 | ki->ki_flags |= IOCB_HIPRI; | |
3205 | if (flags & RWF_DSYNC) | |
3206 | ki->ki_flags |= IOCB_DSYNC; | |
3207 | if (flags & RWF_SYNC) | |
3208 | ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC); | |
3209 | return 0; | |
3210 | } | |
3211 | ||
1da177e4 LT |
3212 | static inline ino_t parent_ino(struct dentry *dentry) |
3213 | { | |
3214 | ino_t res; | |
3215 | ||
b5c84bf6 NP |
3216 | /* |
3217 | * Don't strictly need d_lock here? If the parent ino could change | |
3218 | * then surely we'd have a deeper race in the caller? | |
3219 | */ | |
1da177e4 LT |
3220 | spin_lock(&dentry->d_lock); |
3221 | res = dentry->d_parent->d_inode->i_ino; | |
3222 | spin_unlock(&dentry->d_lock); | |
3223 | return res; | |
3224 | } | |
3225 | ||
1da177e4 LT |
3226 | /* Transaction based IO helpers */ |
3227 | ||
3228 | /* | |
3229 | * An argresp is stored in an allocated page and holds the | |
3230 | * size of the argument or response, along with its content | |
3231 | */ | |
3232 | struct simple_transaction_argresp { | |
3233 | ssize_t size; | |
3234 | char data[0]; | |
3235 | }; | |
3236 | ||
3237 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
3238 | ||
3239 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
3240 | size_t size); | |
3241 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
3242 | size_t size, loff_t *pos); | |
3243 | int simple_transaction_release(struct inode *inode, struct file *file); | |
3244 | ||
76791ab2 | 3245 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 3246 | |
acaefc25 AB |
3247 | /* |
3248 | * simple attribute files | |
3249 | * | |
3250 | * These attributes behave similar to those in sysfs: | |
3251 | * | |
3252 | * Writing to an attribute immediately sets a value, an open file can be | |
3253 | * written to multiple times. | |
3254 | * | |
3255 | * Reading from an attribute creates a buffer from the value that might get | |
3256 | * read with multiple read calls. When the attribute has been read | |
3257 | * completely, no further read calls are possible until the file is opened | |
3258 | * again. | |
3259 | * | |
3260 | * All attributes contain a text representation of a numeric value | |
3261 | * that are accessed with the get() and set() functions. | |
3262 | */ | |
3263 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
3264 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
3265 | { \ | |
3266 | __simple_attr_check_format(__fmt, 0ull); \ | |
3267 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
3268 | } \ | |
828c0950 | 3269 | static const struct file_operations __fops = { \ |
acaefc25 AB |
3270 | .owner = THIS_MODULE, \ |
3271 | .open = __fops ## _open, \ | |
74bedc4d | 3272 | .release = simple_attr_release, \ |
acaefc25 AB |
3273 | .read = simple_attr_read, \ |
3274 | .write = simple_attr_write, \ | |
1ec5584e | 3275 | .llseek = generic_file_llseek, \ |
68be3029 | 3276 | } |
acaefc25 | 3277 | |
b9075fa9 JP |
3278 | static inline __printf(1, 2) |
3279 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
3280 | { |
3281 | /* don't do anything, just let the compiler check the arguments; */ | |
3282 | } | |
3283 | ||
3284 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 3285 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 3286 | const char *fmt); |
74bedc4d | 3287 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
3288 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
3289 | size_t len, loff_t *ppos); | |
3290 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
3291 | size_t len, loff_t *ppos); | |
3292 | ||
4be28540 | 3293 | struct ctl_table; |
8d65af78 | 3294 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 3295 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
3296 | int proc_nr_dentry(struct ctl_table *table, int write, |
3297 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
3298 | int proc_nr_inodes(struct ctl_table *table, int write, |
3299 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 3300 | int __init get_filesystem_list(char *buf); |
62239ac2 | 3301 | |
3cd90ea4 | 3302 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
3303 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
3304 | ||
6d125529 | 3305 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 3306 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 3307 | (flag & __FMODE_NONOTIFY))) |
5300990c | 3308 | |
d37177ba | 3309 | static inline bool is_sxid(umode_t mode) |
69b45732 AK |
3310 | { |
3311 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
3312 | } | |
3313 | ||
cbdf35bc MS |
3314 | static inline int check_sticky(struct inode *dir, struct inode *inode) |
3315 | { | |
3316 | if (!(dir->i_mode & S_ISVTX)) | |
3317 | return 0; | |
3318 | ||
3319 | return __check_sticky(dir, inode); | |
3320 | } | |
3321 | ||
69b45732 AK |
3322 | static inline void inode_has_no_xattr(struct inode *inode) |
3323 | { | |
e462ec50 | 3324 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC)) |
69b45732 AK |
3325 | inode->i_flags |= S_NOSEC; |
3326 | } | |
3327 | ||
a7400222 AV |
3328 | static inline bool is_root_inode(struct inode *inode) |
3329 | { | |
3330 | return inode == inode->i_sb->s_root->d_inode; | |
3331 | } | |
3332 | ||
5f99f4e7 AV |
3333 | static inline bool dir_emit(struct dir_context *ctx, |
3334 | const char *name, int namelen, | |
3335 | u64 ino, unsigned type) | |
3336 | { | |
3337 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; | |
3338 | } | |
3339 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) | |
3340 | { | |
3341 | return ctx->actor(ctx, ".", 1, ctx->pos, | |
3342 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; | |
3343 | } | |
3344 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) | |
3345 | { | |
3346 | return ctx->actor(ctx, "..", 2, ctx->pos, | |
3347 | parent_ino(file->f_path.dentry), DT_DIR) == 0; | |
3348 | } | |
3349 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) | |
3350 | { | |
3351 | if (ctx->pos == 0) { | |
3352 | if (!dir_emit_dot(file, ctx)) | |
3353 | return false; | |
3354 | ctx->pos = 1; | |
3355 | } | |
3356 | if (ctx->pos == 1) { | |
3357 | if (!dir_emit_dotdot(file, ctx)) | |
3358 | return false; | |
3359 | ctx->pos = 2; | |
3360 | } | |
3361 | return true; | |
3362 | } | |
5ded75ec AV |
3363 | static inline bool dir_relax(struct inode *inode) |
3364 | { | |
5955102c AV |
3365 | inode_unlock(inode); |
3366 | inode_lock(inode); | |
5ded75ec AV |
3367 | return !IS_DEADDIR(inode); |
3368 | } | |
5f99f4e7 | 3369 | |
ae05327a AV |
3370 | static inline bool dir_relax_shared(struct inode *inode) |
3371 | { | |
3372 | inode_unlock_shared(inode); | |
3373 | inode_lock_shared(inode); | |
3374 | return !IS_DEADDIR(inode); | |
3375 | } | |
3376 | ||
90f8572b | 3377 | extern bool path_noexec(const struct path *path); |
21fc61c7 | 3378 | extern void inode_nohighmem(struct inode *inode); |
90f8572b | 3379 | |
1da177e4 | 3380 | #endif /* _LINUX_FS_H */ |