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1da177e4 LT |
1 | #ifndef _LINUX_FS_H |
2 | #define _LINUX_FS_H | |
3 | ||
1da177e4 | 4 | #include <linux/linkage.h> |
5dd43ce2 | 5 | #include <linux/wait_bit.h> |
1da177e4 LT |
6 | #include <linux/kdev_t.h> |
7 | #include <linux/dcache.h> | |
3f8206d4 | 8 | #include <linux/path.h> |
1da177e4 LT |
9 | #include <linux/stat.h> |
10 | #include <linux/cache.h> | |
1da177e4 | 11 | #include <linux/list.h> |
bc3b14cb | 12 | #include <linux/list_lru.h> |
4f5e65a1 | 13 | #include <linux/llist.h> |
1da177e4 | 14 | #include <linux/radix-tree.h> |
6b2dbba8 | 15 | #include <linux/rbtree.h> |
1da177e4 | 16 | #include <linux/init.h> |
914e2637 | 17 | #include <linux/pid.h> |
187f1882 | 18 | #include <linux/bug.h> |
1b1dcc1b | 19 | #include <linux/mutex.h> |
c8c06efa | 20 | #include <linux/rwsem.h> |
baabda26 | 21 | #include <linux/mm_types.h> |
3bd858ab | 22 | #include <linux/capability.h> |
6188e10d | 23 | #include <linux/semaphore.h> |
c75b1d94 | 24 | #include <linux/fcntl.h> |
c4b929b8 | 25 | #include <linux/fiemap.h> |
ceb5bdc2 | 26 | #include <linux/rculist_bl.h> |
07b8ce1e | 27 | #include <linux/atomic.h> |
83aeeada | 28 | #include <linux/shrinker.h> |
c1aab02d | 29 | #include <linux/migrate_mode.h> |
92361636 | 30 | #include <linux/uidgid.h> |
5accdf82 | 31 | #include <linux/lockdep.h> |
c2b1ad80 | 32 | #include <linux/percpu-rwsem.h> |
853b39a7 | 33 | #include <linux/workqueue.h> |
fceef393 | 34 | #include <linux/delayed_call.h> |
85787090 | 35 | #include <linux/uuid.h> |
5660e13d | 36 | #include <linux/errseq.h> |
1da177e4 | 37 | |
1da177e4 | 38 | #include <asm/byteorder.h> |
607ca46e | 39 | #include <uapi/linux/fs.h> |
1da177e4 | 40 | |
b83ae6d4 | 41 | struct backing_dev_info; |
52ebea74 | 42 | struct bdi_writeback; |
2f8b5444 | 43 | struct bio; |
a5694255 | 44 | struct export_operations; |
a885c8c4 | 45 | struct hd_geometry; |
1da177e4 | 46 | struct iovec; |
92198f7e | 47 | struct kiocb; |
57cc7215 | 48 | struct kobject; |
1da177e4 LT |
49 | struct pipe_inode_info; |
50 | struct poll_table_struct; | |
51 | struct kstatfs; | |
52 | struct vm_area_struct; | |
53 | struct vfsmount; | |
745ca247 | 54 | struct cred; |
a509bc1a | 55 | struct swap_info_struct; |
55985dd7 | 56 | struct seq_file; |
7b7a8665 | 57 | struct workqueue_struct; |
3b93f911 | 58 | struct iov_iter; |
0b81d077 JK |
59 | struct fscrypt_info; |
60 | struct fscrypt_operations; | |
1da177e4 | 61 | |
74bf17cf | 62 | extern void __init inode_init(void); |
1da177e4 | 63 | extern void __init inode_init_early(void); |
4248b0da MG |
64 | extern void __init files_init(void); |
65 | extern void __init files_maxfiles_init(void); | |
1da177e4 | 66 | |
dded4f4d | 67 | extern struct files_stat_struct files_stat; |
518de9b3 | 68 | extern unsigned long get_max_files(void); |
9b80a184 | 69 | extern unsigned int sysctl_nr_open; |
dded4f4d JE |
70 | extern struct inodes_stat_t inodes_stat; |
71 | extern int leases_enable, lease_break_time; | |
800179c9 KC |
72 | extern int sysctl_protected_symlinks; |
73 | extern int sysctl_protected_hardlinks; | |
dded4f4d | 74 | |
ddef7ed2 CH |
75 | typedef __kernel_rwf_t rwf_t; |
76 | ||
1da177e4 LT |
77 | struct buffer_head; |
78 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
79 | struct buffer_head *bh_result, int create); | |
187372a3 | 80 | typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
7b7a8665 | 81 | ssize_t bytes, void *private); |
1da177e4 | 82 | |
bbc1096a DH |
83 | #define MAY_EXEC 0x00000001 |
84 | #define MAY_WRITE 0x00000002 | |
85 | #define MAY_READ 0x00000004 | |
86 | #define MAY_APPEND 0x00000008 | |
87 | #define MAY_ACCESS 0x00000010 | |
88 | #define MAY_OPEN 0x00000020 | |
89 | #define MAY_CHDIR 0x00000040 | |
90 | /* called from RCU mode, don't block */ | |
91 | #define MAY_NOT_BLOCK 0x00000080 | |
92 | ||
93 | /* | |
94 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond | |
95 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() | |
96 | */ | |
97 | ||
98 | /* file is open for reading */ | |
99 | #define FMODE_READ ((__force fmode_t)0x1) | |
100 | /* file is open for writing */ | |
101 | #define FMODE_WRITE ((__force fmode_t)0x2) | |
102 | /* file is seekable */ | |
103 | #define FMODE_LSEEK ((__force fmode_t)0x4) | |
104 | /* file can be accessed using pread */ | |
105 | #define FMODE_PREAD ((__force fmode_t)0x8) | |
106 | /* file can be accessed using pwrite */ | |
107 | #define FMODE_PWRITE ((__force fmode_t)0x10) | |
108 | /* File is opened for execution with sys_execve / sys_uselib */ | |
109 | #define FMODE_EXEC ((__force fmode_t)0x20) | |
110 | /* File is opened with O_NDELAY (only set for block devices) */ | |
111 | #define FMODE_NDELAY ((__force fmode_t)0x40) | |
112 | /* File is opened with O_EXCL (only set for block devices) */ | |
113 | #define FMODE_EXCL ((__force fmode_t)0x80) | |
114 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls | |
115 | (specialy hack for floppy.c) */ | |
116 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) | |
117 | /* 32bit hashes as llseek() offset (for directories) */ | |
118 | #define FMODE_32BITHASH ((__force fmode_t)0x200) | |
119 | /* 64bit hashes as llseek() offset (for directories) */ | |
120 | #define FMODE_64BITHASH ((__force fmode_t)0x400) | |
121 | ||
122 | /* | |
123 | * Don't update ctime and mtime. | |
124 | * | |
125 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll | |
126 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. | |
127 | */ | |
128 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) | |
129 | ||
130 | /* Expect random access pattern */ | |
131 | #define FMODE_RANDOM ((__force fmode_t)0x1000) | |
132 | ||
133 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ | |
134 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) | |
135 | ||
136 | /* File is opened with O_PATH; almost nothing can be done with it */ | |
137 | #define FMODE_PATH ((__force fmode_t)0x4000) | |
138 | ||
9c225f26 LT |
139 | /* File needs atomic accesses to f_pos */ |
140 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) | |
83f936c7 AV |
141 | /* Write access to underlying fs */ |
142 | #define FMODE_WRITER ((__force fmode_t)0x10000) | |
7f7f25e8 AV |
143 | /* Has read method(s) */ |
144 | #define FMODE_CAN_READ ((__force fmode_t)0x20000) | |
145 | /* Has write method(s) */ | |
146 | #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) | |
9c225f26 | 147 | |
bbc1096a | 148 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
75069f2b | 149 | #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
bbc1096a | 150 | |
91f9943e CH |
151 | /* File is capable of returning -EAGAIN if I/O will block */ |
152 | #define FMODE_NOWAIT ((__force fmode_t)0x8000000) | |
b745fafa | 153 | |
bbc1096a DH |
154 | /* |
155 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector | |
156 | * that indicates that they should check the contents of the iovec are | |
157 | * valid, but not check the memory that the iovec elements | |
158 | * points too. | |
159 | */ | |
160 | #define CHECK_IOVEC_ONLY -1 | |
161 | ||
1da177e4 LT |
162 | /* |
163 | * Attribute flags. These should be or-ed together to figure out what | |
164 | * has been changed! | |
165 | */ | |
9767d749 MS |
166 | #define ATTR_MODE (1 << 0) |
167 | #define ATTR_UID (1 << 1) | |
168 | #define ATTR_GID (1 << 2) | |
169 | #define ATTR_SIZE (1 << 3) | |
170 | #define ATTR_ATIME (1 << 4) | |
171 | #define ATTR_MTIME (1 << 5) | |
172 | #define ATTR_CTIME (1 << 6) | |
173 | #define ATTR_ATIME_SET (1 << 7) | |
174 | #define ATTR_MTIME_SET (1 << 8) | |
175 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
176 | #define ATTR_ATTR_FLAG (1 << 10) | |
177 | #define ATTR_KILL_SUID (1 << 11) | |
178 | #define ATTR_KILL_SGID (1 << 12) | |
179 | #define ATTR_FILE (1 << 13) | |
180 | #define ATTR_KILL_PRIV (1 << 14) | |
181 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
182 | #define ATTR_TIMES_SET (1 << 16) | |
f2b20f6e | 183 | #define ATTR_TOUCH (1 << 17) |
1da177e4 | 184 | |
787fb6bc MS |
185 | /* |
186 | * Whiteout is represented by a char device. The following constants define the | |
187 | * mode and device number to use. | |
188 | */ | |
189 | #define WHITEOUT_MODE 0 | |
190 | #define WHITEOUT_DEV 0 | |
191 | ||
1da177e4 LT |
192 | /* |
193 | * This is the Inode Attributes structure, used for notify_change(). It | |
194 | * uses the above definitions as flags, to know which values have changed. | |
195 | * Also, in this manner, a Filesystem can look at only the values it cares | |
196 | * about. Basically, these are the attributes that the VFS layer can | |
197 | * request to change from the FS layer. | |
198 | * | |
199 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
200 | */ | |
201 | struct iattr { | |
202 | unsigned int ia_valid; | |
203 | umode_t ia_mode; | |
92361636 EB |
204 | kuid_t ia_uid; |
205 | kgid_t ia_gid; | |
1da177e4 LT |
206 | loff_t ia_size; |
207 | struct timespec ia_atime; | |
208 | struct timespec ia_mtime; | |
209 | struct timespec ia_ctime; | |
cc4e69de MS |
210 | |
211 | /* | |
25985edc | 212 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
213 | * implement an ftruncate() like method. NOTE: filesystem should |
214 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
215 | */ | |
216 | struct file *ia_file; | |
1da177e4 LT |
217 | }; |
218 | ||
1da177e4 LT |
219 | /* |
220 | * Includes for diskquotas. | |
221 | */ | |
222 | #include <linux/quota.h> | |
223 | ||
69c433ed MS |
224 | /* |
225 | * Maximum number of layers of fs stack. Needs to be limited to | |
226 | * prevent kernel stack overflow | |
227 | */ | |
228 | #define FILESYSTEM_MAX_STACK_DEPTH 2 | |
229 | ||
994fc28c ZB |
230 | /** |
231 | * enum positive_aop_returns - aop return codes with specific semantics | |
232 | * | |
233 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
234 | * completed, that the page is still locked, and | |
235 | * should be considered active. The VM uses this hint | |
236 | * to return the page to the active list -- it won't | |
237 | * be a candidate for writeback again in the near | |
238 | * future. Other callers must be careful to unlock | |
239 | * the page if they get this return. Returned by | |
240 | * writepage(); | |
241 | * | |
242 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
243 | * unlocked it and the page might have been truncated. | |
244 | * The caller should back up to acquiring a new page and | |
245 | * trying again. The aop will be taking reasonable | |
246 | * precautions not to livelock. If the caller held a page | |
247 | * reference, it should drop it before retrying. Returned | |
55144768 | 248 | * by readpage(). |
994fc28c ZB |
249 | * |
250 | * address_space_operation functions return these large constants to indicate | |
251 | * special semantics to the caller. These are much larger than the bytes in a | |
252 | * page to allow for functions that return the number of bytes operated on in a | |
253 | * given page. | |
254 | */ | |
255 | ||
256 | enum positive_aop_returns { | |
257 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
258 | AOP_TRUNCATED_PAGE = 0x80001, | |
259 | }; | |
260 | ||
c718a975 TH |
261 | #define AOP_FLAG_CONT_EXPAND 0x0001 /* called from cont_expand */ |
262 | #define AOP_FLAG_NOFS 0x0002 /* used by filesystem to direct | |
54566b2c NP |
263 | * helper code (eg buffer layer) |
264 | * to clear GFP_FS from alloc */ | |
afddba49 | 265 | |
1da177e4 LT |
266 | /* |
267 | * oh the beauties of C type declarations. | |
268 | */ | |
269 | struct page; | |
270 | struct address_space; | |
271 | struct writeback_control; | |
1da177e4 | 272 | |
c75b1d94 JA |
273 | /* |
274 | * Write life time hint values. | |
275 | */ | |
276 | enum rw_hint { | |
277 | WRITE_LIFE_NOT_SET = 0, | |
278 | WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE, | |
279 | WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT, | |
280 | WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, | |
281 | WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, | |
282 | WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, | |
283 | }; | |
284 | ||
e2e40f2c | 285 | #define IOCB_EVENTFD (1 << 0) |
2ba48ce5 AV |
286 | #define IOCB_APPEND (1 << 1) |
287 | #define IOCB_DIRECT (1 << 2) | |
97be7ebe | 288 | #define IOCB_HIPRI (1 << 3) |
dde0c2e7 CH |
289 | #define IOCB_DSYNC (1 << 4) |
290 | #define IOCB_SYNC (1 << 5) | |
70fe2f48 | 291 | #define IOCB_WRITE (1 << 6) |
b745fafa | 292 | #define IOCB_NOWAIT (1 << 7) |
e2e40f2c CH |
293 | |
294 | struct kiocb { | |
295 | struct file *ki_filp; | |
296 | loff_t ki_pos; | |
297 | void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); | |
298 | void *private; | |
299 | int ki_flags; | |
c75b1d94 | 300 | enum rw_hint ki_hint; |
3859a271 | 301 | } __randomize_layout; |
e2e40f2c CH |
302 | |
303 | static inline bool is_sync_kiocb(struct kiocb *kiocb) | |
304 | { | |
305 | return kiocb->ki_complete == NULL; | |
306 | } | |
307 | ||
8ab22b9a HH |
308 | /* |
309 | * "descriptor" for what we're up to with a read. | |
310 | * This allows us to use the same read code yet | |
311 | * have multiple different users of the data that | |
312 | * we read from a file. | |
313 | * | |
314 | * The simplest case just copies the data to user | |
315 | * mode. | |
316 | */ | |
317 | typedef struct { | |
318 | size_t written; | |
319 | size_t count; | |
320 | union { | |
321 | char __user *buf; | |
322 | void *data; | |
323 | } arg; | |
324 | int error; | |
325 | } read_descriptor_t; | |
326 | ||
327 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
328 | unsigned long, unsigned long); | |
2f718ffc | 329 | |
1da177e4 LT |
330 | struct address_space_operations { |
331 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
332 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
333 | |
334 | /* Write back some dirty pages from this mapping. */ | |
335 | int (*writepages)(struct address_space *, struct writeback_control *); | |
336 | ||
4741c9fd | 337 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
338 | int (*set_page_dirty)(struct page *page); |
339 | ||
340 | int (*readpages)(struct file *filp, struct address_space *mapping, | |
341 | struct list_head *pages, unsigned nr_pages); | |
342 | ||
afddba49 NP |
343 | int (*write_begin)(struct file *, struct address_space *mapping, |
344 | loff_t pos, unsigned len, unsigned flags, | |
345 | struct page **pagep, void **fsdata); | |
346 | int (*write_end)(struct file *, struct address_space *mapping, | |
347 | loff_t pos, unsigned len, unsigned copied, | |
348 | struct page *page, void *fsdata); | |
349 | ||
1da177e4 LT |
350 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
351 | sector_t (*bmap)(struct address_space *, sector_t); | |
d47992f8 | 352 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
27496a8c | 353 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 354 | void (*freepage)(struct page *); |
c8b8e32d | 355 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); |
b969c4ab | 356 | /* |
ef277c73 TC |
357 | * migrate the contents of a page to the specified target. If |
358 | * migrate_mode is MIGRATE_ASYNC, it must not block. | |
b969c4ab | 359 | */ |
2d1db3b1 | 360 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 361 | struct page *, struct page *, enum migrate_mode); |
bda807d4 MK |
362 | bool (*isolate_page)(struct page *, isolate_mode_t); |
363 | void (*putback_page)(struct page *); | |
e3db7691 | 364 | int (*launder_page) (struct page *); |
c186afb4 | 365 | int (*is_partially_uptodate) (struct page *, unsigned long, |
8ab22b9a | 366 | unsigned long); |
b4597226 | 367 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
25718736 | 368 | int (*error_remove_page)(struct address_space *, struct page *); |
62c230bc MG |
369 | |
370 | /* swapfile support */ | |
a509bc1a MG |
371 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
372 | sector_t *span); | |
373 | void (*swap_deactivate)(struct file *file); | |
1da177e4 LT |
374 | }; |
375 | ||
7dcda1c9 JA |
376 | extern const struct address_space_operations empty_aops; |
377 | ||
afddba49 NP |
378 | /* |
379 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
380 | * to write into the pagecache. | |
381 | */ | |
382 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
383 | loff_t pos, unsigned len, unsigned flags, | |
384 | struct page **pagep, void **fsdata); | |
385 | ||
386 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
387 | loff_t pos, unsigned len, unsigned copied, | |
388 | struct page *page, void *fsdata); | |
389 | ||
1da177e4 LT |
390 | struct address_space { |
391 | struct inode *host; /* owner: inode, block_device */ | |
392 | struct radix_tree_root page_tree; /* radix tree of all pages */ | |
19fd6231 | 393 | spinlock_t tree_lock; /* and lock protecting it */ |
4bb5f5d9 | 394 | atomic_t i_mmap_writable;/* count VM_SHARED mappings */ |
f808c13f | 395 | struct rb_root_cached i_mmap; /* tree of private and shared mappings */ |
c8c06efa | 396 | struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ |
08142579 | 397 | /* Protected by tree_lock together with the radix tree */ |
1da177e4 | 398 | unsigned long nrpages; /* number of total pages */ |
f9fe48be RZ |
399 | /* number of shadow or DAX exceptional entries */ |
400 | unsigned long nrexceptional; | |
1da177e4 | 401 | pgoff_t writeback_index;/* writeback starts here */ |
f5e54d6e | 402 | const struct address_space_operations *a_ops; /* methods */ |
9c5d760b | 403 | unsigned long flags; /* error bits */ |
1da177e4 | 404 | spinlock_t private_lock; /* for use by the address_space */ |
9c5d760b | 405 | gfp_t gfp_mask; /* implicit gfp mask for allocations */ |
32e57c29 | 406 | struct list_head private_list; /* for use by the address_space */ |
252aa6f5 | 407 | void *private_data; /* ditto */ |
5660e13d | 408 | errseq_t wb_err; |
3859a271 | 409 | } __attribute__((aligned(sizeof(long)))) __randomize_layout; |
1da177e4 LT |
410 | /* |
411 | * On most architectures that alignment is already the case; but | |
25985edc | 412 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
413 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
414 | */ | |
87192a2a | 415 | struct request_queue; |
1da177e4 LT |
416 | |
417 | struct block_device { | |
418 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 419 | int bd_openers; |
1da177e4 | 420 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 421 | struct super_block * bd_super; |
c039e313 | 422 | struct mutex bd_mutex; /* open/close mutex */ |
6b4517a7 | 423 | void * bd_claiming; |
1da177e4 LT |
424 | void * bd_holder; |
425 | int bd_holders; | |
77ea887e | 426 | bool bd_write_holder; |
641dc636 | 427 | #ifdef CONFIG_SYSFS |
49731baa | 428 | struct list_head bd_holder_disks; |
641dc636 | 429 | #endif |
1da177e4 LT |
430 | struct block_device * bd_contains; |
431 | unsigned bd_block_size; | |
c2ee070f | 432 | u8 bd_partno; |
1da177e4 LT |
433 | struct hd_struct * bd_part; |
434 | /* number of times partitions within this device have been opened. */ | |
435 | unsigned bd_part_count; | |
436 | int bd_invalidated; | |
437 | struct gendisk * bd_disk; | |
87192a2a | 438 | struct request_queue * bd_queue; |
b1d2dc56 | 439 | struct backing_dev_info *bd_bdi; |
1da177e4 | 440 | struct list_head bd_list; |
1da177e4 LT |
441 | /* |
442 | * Private data. You must have bd_claim'ed the block_device | |
443 | * to use this. NOTE: bd_claim allows an owner to claim | |
444 | * the same device multiple times, the owner must take special | |
445 | * care to not mess up bd_private for that case. | |
446 | */ | |
447 | unsigned long bd_private; | |
fcccf502 TS |
448 | |
449 | /* The counter of freeze processes */ | |
450 | int bd_fsfreeze_count; | |
451 | /* Mutex for freeze */ | |
452 | struct mutex bd_fsfreeze_mutex; | |
3859a271 | 453 | } __randomize_layout; |
1da177e4 LT |
454 | |
455 | /* | |
456 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache | |
457 | * radix trees | |
458 | */ | |
459 | #define PAGECACHE_TAG_DIRTY 0 | |
460 | #define PAGECACHE_TAG_WRITEBACK 1 | |
f446daae | 461 | #define PAGECACHE_TAG_TOWRITE 2 |
1da177e4 LT |
462 | |
463 | int mapping_tagged(struct address_space *mapping, int tag); | |
464 | ||
8b28f621 DB |
465 | static inline void i_mmap_lock_write(struct address_space *mapping) |
466 | { | |
c8c06efa | 467 | down_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
468 | } |
469 | ||
470 | static inline void i_mmap_unlock_write(struct address_space *mapping) | |
471 | { | |
c8c06efa | 472 | up_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
473 | } |
474 | ||
3dec0ba0 DB |
475 | static inline void i_mmap_lock_read(struct address_space *mapping) |
476 | { | |
477 | down_read(&mapping->i_mmap_rwsem); | |
478 | } | |
479 | ||
480 | static inline void i_mmap_unlock_read(struct address_space *mapping) | |
481 | { | |
482 | up_read(&mapping->i_mmap_rwsem); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* |
486 | * Might pages of this file be mapped into userspace? | |
487 | */ | |
488 | static inline int mapping_mapped(struct address_space *mapping) | |
489 | { | |
f808c13f | 490 | return !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root); |
1da177e4 LT |
491 | } |
492 | ||
493 | /* | |
494 | * Might pages of this file have been modified in userspace? | |
495 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
496 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
497 | * writing i.e. vma may be mprotected writable even if now readonly. | |
4bb5f5d9 DH |
498 | * |
499 | * If i_mmap_writable is negative, no new writable mappings are allowed. You | |
500 | * can only deny writable mappings, if none exists right now. | |
1da177e4 LT |
501 | */ |
502 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
503 | { | |
4bb5f5d9 DH |
504 | return atomic_read(&mapping->i_mmap_writable) > 0; |
505 | } | |
506 | ||
507 | static inline int mapping_map_writable(struct address_space *mapping) | |
508 | { | |
509 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? | |
510 | 0 : -EPERM; | |
511 | } | |
512 | ||
513 | static inline void mapping_unmap_writable(struct address_space *mapping) | |
514 | { | |
515 | atomic_dec(&mapping->i_mmap_writable); | |
516 | } | |
517 | ||
518 | static inline int mapping_deny_writable(struct address_space *mapping) | |
519 | { | |
520 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? | |
521 | 0 : -EBUSY; | |
522 | } | |
523 | ||
524 | static inline void mapping_allow_writable(struct address_space *mapping) | |
525 | { | |
526 | atomic_inc(&mapping->i_mmap_writable); | |
1da177e4 LT |
527 | } |
528 | ||
529 | /* | |
530 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
531 | */ | |
532 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
533 | #include <linux/seqlock.h> | |
534 | #define __NEED_I_SIZE_ORDERED | |
535 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
536 | #else | |
537 | #define i_size_ordered_init(inode) do { } while (0) | |
538 | #endif | |
539 | ||
f19d4a8f AV |
540 | struct posix_acl; |
541 | #define ACL_NOT_CACHED ((void *)(-1)) | |
2a3a2a3f | 542 | #define ACL_DONT_CACHE ((void *)(-3)) |
f19d4a8f | 543 | |
b8a7a3a6 AG |
544 | static inline struct posix_acl * |
545 | uncached_acl_sentinel(struct task_struct *task) | |
546 | { | |
547 | return (void *)task + 1; | |
548 | } | |
549 | ||
550 | static inline bool | |
551 | is_uncached_acl(struct posix_acl *acl) | |
552 | { | |
553 | return (long)acl & 1; | |
554 | } | |
555 | ||
3ddcd056 LT |
556 | #define IOP_FASTPERM 0x0001 |
557 | #define IOP_LOOKUP 0x0002 | |
558 | #define IOP_NOFOLLOW 0x0004 | |
d0a5b995 | 559 | #define IOP_XATTR 0x0008 |
76fca90e | 560 | #define IOP_DEFAULT_READLINK 0x0010 |
3ddcd056 | 561 | |
9dd813c1 JK |
562 | struct fsnotify_mark_connector; |
563 | ||
3ddcd056 LT |
564 | /* |
565 | * Keep mostly read-only and often accessed (especially for | |
566 | * the RCU path lookup and 'stat' data) fields at the beginning | |
567 | * of the 'struct inode' | |
568 | */ | |
1da177e4 | 569 | struct inode { |
44a7d7a8 | 570 | umode_t i_mode; |
3ddcd056 | 571 | unsigned short i_opflags; |
92361636 EB |
572 | kuid_t i_uid; |
573 | kgid_t i_gid; | |
3ddcd056 LT |
574 | unsigned int i_flags; |
575 | ||
576 | #ifdef CONFIG_FS_POSIX_ACL | |
577 | struct posix_acl *i_acl; | |
578 | struct posix_acl *i_default_acl; | |
579 | #endif | |
580 | ||
44a7d7a8 NP |
581 | const struct inode_operations *i_op; |
582 | struct super_block *i_sb; | |
3ddcd056 | 583 | struct address_space *i_mapping; |
44a7d7a8 | 584 | |
13e12d14 LT |
585 | #ifdef CONFIG_SECURITY |
586 | void *i_security; | |
587 | #endif | |
44a7d7a8 | 588 | |
3ddcd056 LT |
589 | /* Stat data, not accessed from path walking */ |
590 | unsigned long i_ino; | |
a78ef704 MS |
591 | /* |
592 | * Filesystems may only read i_nlink directly. They shall use the | |
593 | * following functions for modification: | |
594 | * | |
595 | * (set|clear|inc|drop)_nlink | |
596 | * inode_(inc|dec)_link_count | |
597 | */ | |
598 | union { | |
599 | const unsigned int i_nlink; | |
600 | unsigned int __i_nlink; | |
601 | }; | |
3ddcd056 | 602 | dev_t i_rdev; |
2f9d3df8 | 603 | loff_t i_size; |
3ddcd056 LT |
604 | struct timespec i_atime; |
605 | struct timespec i_mtime; | |
606 | struct timespec i_ctime; | |
6cdbb0ef TT |
607 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
608 | unsigned short i_bytes; | |
2f9d3df8 | 609 | unsigned int i_blkbits; |
c75b1d94 | 610 | enum rw_hint i_write_hint; |
3ddcd056 LT |
611 | blkcnt_t i_blocks; |
612 | ||
613 | #ifdef __NEED_I_SIZE_ORDERED | |
614 | seqcount_t i_size_seqcount; | |
615 | #endif | |
616 | ||
617 | /* Misc */ | |
618 | unsigned long i_state; | |
9902af79 | 619 | struct rw_semaphore i_rwsem; |
13e12d14 | 620 | |
44a7d7a8 | 621 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
a2f48706 | 622 | unsigned long dirtied_time_when; |
44a7d7a8 | 623 | |
1da177e4 | 624 | struct hlist_node i_hash; |
c7f54084 | 625 | struct list_head i_io_list; /* backing dev IO list */ |
52ebea74 TH |
626 | #ifdef CONFIG_CGROUP_WRITEBACK |
627 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ | |
2a814908 TH |
628 | |
629 | /* foreign inode detection, see wbc_detach_inode() */ | |
630 | int i_wb_frn_winner; | |
631 | u16 i_wb_frn_avg_time; | |
632 | u16 i_wb_frn_history; | |
52ebea74 | 633 | #endif |
7ccf19a8 | 634 | struct list_head i_lru; /* inode LRU list */ |
1da177e4 | 635 | struct list_head i_sb_list; |
6c60d2b5 | 636 | struct list_head i_wb_list; /* backing dev writeback list */ |
fa0d7e3d | 637 | union { |
b3d9b7a3 | 638 | struct hlist_head i_dentry; |
fa0d7e3d NP |
639 | struct rcu_head i_rcu; |
640 | }; | |
7a224228 | 641 | u64 i_version; |
2f9d3df8 | 642 | atomic_t i_count; |
bd5fe6c5 | 643 | atomic_t i_dio_count; |
6cdbb0ef | 644 | atomic_t i_writecount; |
d984ea60 MZ |
645 | #ifdef CONFIG_IMA |
646 | atomic_t i_readcount; /* struct files open RO */ | |
647 | #endif | |
99ac48f5 | 648 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
4a075e39 | 649 | struct file_lock_context *i_flctx; |
1da177e4 | 650 | struct address_space i_data; |
1da177e4 | 651 | struct list_head i_devices; |
4c154168 TT |
652 | union { |
653 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 654 | struct block_device *i_bdev; |
577c4eb0 | 655 | struct cdev *i_cdev; |
61ba64fc | 656 | char *i_link; |
84e710da | 657 | unsigned i_dir_seq; |
4c154168 | 658 | }; |
1da177e4 LT |
659 | |
660 | __u32 i_generation; | |
661 | ||
3be25f49 EP |
662 | #ifdef CONFIG_FSNOTIFY |
663 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
08991e83 | 664 | struct fsnotify_mark_connector __rcu *i_fsnotify_marks; |
0eeca283 RL |
665 | #endif |
666 | ||
0b81d077 JK |
667 | #if IS_ENABLED(CONFIG_FS_ENCRYPTION) |
668 | struct fscrypt_info *i_crypt_info; | |
669 | #endif | |
670 | ||
8e18e294 | 671 | void *i_private; /* fs or device private pointer */ |
3859a271 | 672 | } __randomize_layout; |
1da177e4 | 673 | |
93407472 FF |
674 | static inline unsigned int i_blocksize(const struct inode *node) |
675 | { | |
676 | return (1 << node->i_blkbits); | |
677 | } | |
678 | ||
1d3382cb AV |
679 | static inline int inode_unhashed(struct inode *inode) |
680 | { | |
681 | return hlist_unhashed(&inode->i_hash); | |
682 | } | |
683 | ||
f2eace23 IM |
684 | /* |
685 | * inode->i_mutex nesting subclasses for the lock validator: | |
686 | * | |
687 | * 0: the object of the current VFS operation | |
688 | * 1: parent | |
689 | * 2: child/target | |
40bd22c9 BF |
690 | * 3: xattr |
691 | * 4: second non-directory | |
d1b72cc6 MS |
692 | * 5: second parent (when locking independent directories in rename) |
693 | * | |
694 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two | |
40bd22c9 | 695 | * non-directories at once. |
f2eace23 IM |
696 | * |
697 | * The locking order between these classes is | |
d1b72cc6 | 698 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
f2eace23 IM |
699 | */ |
700 | enum inode_i_mutex_lock_class | |
701 | { | |
702 | I_MUTEX_NORMAL, | |
703 | I_MUTEX_PARENT, | |
704 | I_MUTEX_CHILD, | |
4df46240 | 705 | I_MUTEX_XATTR, |
d1b72cc6 MS |
706 | I_MUTEX_NONDIR2, |
707 | I_MUTEX_PARENT2, | |
f2eace23 IM |
708 | }; |
709 | ||
5955102c AV |
710 | static inline void inode_lock(struct inode *inode) |
711 | { | |
9902af79 | 712 | down_write(&inode->i_rwsem); |
5955102c AV |
713 | } |
714 | ||
715 | static inline void inode_unlock(struct inode *inode) | |
716 | { | |
9902af79 AV |
717 | up_write(&inode->i_rwsem); |
718 | } | |
719 | ||
720 | static inline void inode_lock_shared(struct inode *inode) | |
721 | { | |
722 | down_read(&inode->i_rwsem); | |
723 | } | |
724 | ||
725 | static inline void inode_unlock_shared(struct inode *inode) | |
726 | { | |
727 | up_read(&inode->i_rwsem); | |
5955102c AV |
728 | } |
729 | ||
730 | static inline int inode_trylock(struct inode *inode) | |
731 | { | |
9902af79 AV |
732 | return down_write_trylock(&inode->i_rwsem); |
733 | } | |
734 | ||
735 | static inline int inode_trylock_shared(struct inode *inode) | |
736 | { | |
737 | return down_read_trylock(&inode->i_rwsem); | |
5955102c AV |
738 | } |
739 | ||
740 | static inline int inode_is_locked(struct inode *inode) | |
741 | { | |
9902af79 | 742 | return rwsem_is_locked(&inode->i_rwsem); |
5955102c AV |
743 | } |
744 | ||
745 | static inline void inode_lock_nested(struct inode *inode, unsigned subclass) | |
746 | { | |
9902af79 | 747 | down_write_nested(&inode->i_rwsem, subclass); |
5955102c AV |
748 | } |
749 | ||
375e289e BF |
750 | void lock_two_nondirectories(struct inode *, struct inode*); |
751 | void unlock_two_nondirectories(struct inode *, struct inode*); | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * NOTE: in a 32bit arch with a preemptable kernel and | |
755 | * an UP compile the i_size_read/write must be atomic | |
756 | * with respect to the local cpu (unlike with preempt disabled), | |
757 | * but they don't need to be atomic with respect to other cpus like in | |
758 | * true SMP (so they need either to either locally disable irq around | |
759 | * the read or for example on x86 they can be still implemented as a | |
760 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
761 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
762 | */ | |
48ed214d | 763 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
764 | { |
765 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
766 | loff_t i_size; | |
767 | unsigned int seq; | |
768 | ||
769 | do { | |
770 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
771 | i_size = inode->i_size; | |
772 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
773 | return i_size; | |
774 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
775 | loff_t i_size; | |
776 | ||
777 | preempt_disable(); | |
778 | i_size = inode->i_size; | |
779 | preempt_enable(); | |
780 | return i_size; | |
781 | #else | |
782 | return inode->i_size; | |
783 | #endif | |
784 | } | |
785 | ||
7762f5a0 MS |
786 | /* |
787 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
788 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
789 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
790 | */ | |
1da177e4 LT |
791 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
792 | { | |
793 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
74e3d1e1 | 794 | preempt_disable(); |
1da177e4 LT |
795 | write_seqcount_begin(&inode->i_size_seqcount); |
796 | inode->i_size = i_size; | |
797 | write_seqcount_end(&inode->i_size_seqcount); | |
74e3d1e1 | 798 | preempt_enable(); |
1da177e4 LT |
799 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
800 | preempt_disable(); | |
801 | inode->i_size = i_size; | |
802 | preempt_enable(); | |
803 | #else | |
804 | inode->i_size = i_size; | |
805 | #endif | |
806 | } | |
807 | ||
48ed214d | 808 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
809 | { |
810 | return MINOR(inode->i_rdev); | |
811 | } | |
812 | ||
48ed214d | 813 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
814 | { |
815 | return MAJOR(inode->i_rdev); | |
816 | } | |
817 | ||
818 | extern struct block_device *I_BDEV(struct inode *inode); | |
819 | ||
820 | struct fown_struct { | |
821 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
822 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
823 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
92361636 | 824 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
825 | int signum; /* posix.1b rt signal to be delivered on IO */ |
826 | }; | |
827 | ||
828 | /* | |
829 | * Track a single file's readahead state | |
830 | */ | |
831 | struct file_ra_state { | |
937085aa FW |
832 | pgoff_t start; /* where readahead started */ |
833 | unsigned int size; /* # of readahead pages */ | |
834 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 835 | there are only # of pages ahead */ |
5ce1110b | 836 | |
937085aa | 837 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 838 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 839 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 840 | }; |
1da177e4 | 841 | |
5ce1110b FW |
842 | /* |
843 | * Check if @index falls in the readahead windows. | |
844 | */ | |
845 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
846 | { | |
f9acc8c7 FW |
847 | return (index >= ra->start && |
848 | index < ra->start + ra->size); | |
5ce1110b FW |
849 | } |
850 | ||
1da177e4 | 851 | struct file { |
2f512016 | 852 | union { |
4f5e65a1 | 853 | struct llist_node fu_llist; |
2f512016 ED |
854 | struct rcu_head fu_rcuhead; |
855 | } f_u; | |
0f7fc9e4 | 856 | struct path f_path; |
dd37978c | 857 | struct inode *f_inode; /* cached value */ |
99ac48f5 | 858 | const struct file_operations *f_op; |
ef3d0fd2 AK |
859 | |
860 | /* | |
9c225f26 | 861 | * Protects f_ep_links, f_flags. |
ef3d0fd2 AK |
862 | * Must not be taken from IRQ context. |
863 | */ | |
864 | spinlock_t f_lock; | |
c75b1d94 | 865 | enum rw_hint f_write_hint; |
516e0cc5 | 866 | atomic_long_t f_count; |
1da177e4 | 867 | unsigned int f_flags; |
aeb5d727 | 868 | fmode_t f_mode; |
9c225f26 | 869 | struct mutex f_pos_lock; |
1da177e4 LT |
870 | loff_t f_pos; |
871 | struct fown_struct f_owner; | |
d76b0d9b | 872 | const struct cred *f_cred; |
1da177e4 LT |
873 | struct file_ra_state f_ra; |
874 | ||
2b47c361 | 875 | u64 f_version; |
50462062 | 876 | #ifdef CONFIG_SECURITY |
1da177e4 | 877 | void *f_security; |
50462062 | 878 | #endif |
1da177e4 LT |
879 | /* needed for tty driver, and maybe others */ |
880 | void *private_data; | |
881 | ||
882 | #ifdef CONFIG_EPOLL | |
883 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
884 | struct list_head f_ep_links; | |
28d82dc1 | 885 | struct list_head f_tfile_llink; |
1da177e4 LT |
886 | #endif /* #ifdef CONFIG_EPOLL */ |
887 | struct address_space *f_mapping; | |
5660e13d | 888 | errseq_t f_wb_err; |
3859a271 KC |
889 | } __randomize_layout |
890 | __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ | |
1da177e4 | 891 | |
990d6c2d AK |
892 | struct file_handle { |
893 | __u32 handle_bytes; | |
894 | int handle_type; | |
895 | /* file identifier */ | |
896 | unsigned char f_handle[0]; | |
897 | }; | |
898 | ||
cb0942b8 AV |
899 | static inline struct file *get_file(struct file *f) |
900 | { | |
901 | atomic_long_inc(&f->f_count); | |
902 | return f; | |
903 | } | |
90f31d0e | 904 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
d7065da0 | 905 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
516e0cc5 | 906 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 LT |
907 | |
908 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
909 | ||
910 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
911 | limits, otherwise bad things can happen in VM. */ | |
912 | #if BITS_PER_LONG==32 | |
0cc3b0ec | 913 | #define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT) |
1da177e4 | 914 | #elif BITS_PER_LONG==64 |
0cc3b0ec | 915 | #define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX) |
1da177e4 LT |
916 | #endif |
917 | ||
918 | #define FL_POSIX 1 | |
919 | #define FL_FLOCK 2 | |
617588d5 | 920 | #define FL_DELEG 4 /* NFSv4 delegation */ |
1da177e4 | 921 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
f475ae95 | 922 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 923 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 924 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 925 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
926 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
927 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
cff2fce5 | 928 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
11afe9f7 | 929 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
1da177e4 | 930 | |
50f2112c BC |
931 | #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE) |
932 | ||
bde74e4b MS |
933 | /* |
934 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
935 | * asynchronous locking. | |
936 | */ | |
937 | #define FILE_LOCK_DEFERRED 1 | |
938 | ||
7ca76311 | 939 | /* legacy typedef, should eventually be removed */ |
17fa388d | 940 | typedef void *fl_owner_t; |
1da177e4 | 941 | |
a7231a97 JL |
942 | struct file_lock; |
943 | ||
1da177e4 | 944 | struct file_lock_operations { |
1da177e4 LT |
945 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
946 | void (*fl_release_private)(struct file_lock *); | |
947 | }; | |
948 | ||
949 | struct lock_manager_operations { | |
8fb47a4f | 950 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
3999e493 | 951 | unsigned long (*lm_owner_key)(struct file_lock *); |
cae80b30 JL |
952 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
953 | void (*lm_put_owner)(fl_owner_t); | |
8fb47a4f | 954 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
d0449b90 | 955 | int (*lm_grant)(struct file_lock *, int); |
4d01b7f5 | 956 | bool (*lm_break)(struct file_lock *); |
7448cc37 | 957 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
1c7dd2ff | 958 | void (*lm_setup)(struct file_lock *, void **); |
1da177e4 LT |
959 | }; |
960 | ||
af558e33 BF |
961 | struct lock_manager { |
962 | struct list_head list; | |
c87fb4a3 BF |
963 | /* |
964 | * NFSv4 and up also want opens blocked during the grace period; | |
965 | * NLM doesn't care: | |
966 | */ | |
967 | bool block_opens; | |
af558e33 BF |
968 | }; |
969 | ||
5ccb0066 SK |
970 | struct net; |
971 | void locks_start_grace(struct net *, struct lock_manager *); | |
af558e33 | 972 | void locks_end_grace(struct lock_manager *); |
5ccb0066 | 973 | int locks_in_grace(struct net *); |
c87fb4a3 | 974 | int opens_in_grace(struct net *); |
af558e33 | 975 | |
1da177e4 LT |
976 | /* that will die - we need it for nfs_lock_info */ |
977 | #include <linux/nfs_fs_i.h> | |
978 | ||
1cb36012 JL |
979 | /* |
980 | * struct file_lock represents a generic "file lock". It's used to represent | |
981 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to | |
982 | * note that the same struct is used to represent both a request for a lock and | |
983 | * the lock itself, but the same object is never used for both. | |
984 | * | |
985 | * FIXME: should we create a separate "struct lock_request" to help distinguish | |
986 | * these two uses? | |
987 | * | |
8116bf4c | 988 | * The varous i_flctx lists are ordered by: |
1cb36012 | 989 | * |
8116bf4c JL |
990 | * 1) lock owner |
991 | * 2) lock range start | |
992 | * 3) lock range end | |
1cb36012 JL |
993 | * |
994 | * Obviously, the last two criteria only matter for POSIX locks. | |
995 | */ | |
1da177e4 LT |
996 | struct file_lock { |
997 | struct file_lock *fl_next; /* singly linked list for this inode */ | |
6dee60f6 | 998 | struct list_head fl_list; /* link into file_lock_context */ |
139ca04e | 999 | struct hlist_node fl_link; /* node in global lists */ |
1da177e4 LT |
1000 | struct list_head fl_block; /* circular list of blocked processes */ |
1001 | fl_owner_t fl_owner; | |
710b7216 | 1002 | unsigned int fl_flags; |
afc1246f | 1003 | unsigned char fl_type; |
1da177e4 | 1004 | unsigned int fl_pid; |
7012b02a | 1005 | int fl_link_cpu; /* what cpu's list is this on? */ |
1da177e4 LT |
1006 | wait_queue_head_t fl_wait; |
1007 | struct file *fl_file; | |
1da177e4 LT |
1008 | loff_t fl_start; |
1009 | loff_t fl_end; | |
1010 | ||
1011 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
1012 | /* for lease breaks: */ |
1013 | unsigned long fl_break_time; | |
1014 | unsigned long fl_downgrade_time; | |
1da177e4 | 1015 | |
6aed6285 | 1016 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 1017 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
1018 | union { |
1019 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 1020 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
1021 | struct { |
1022 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
1023 | int state; /* state of grant or error if -ve */ | |
1024 | } afs; | |
1da177e4 | 1025 | } fl_u; |
3859a271 | 1026 | } __randomize_layout; |
1da177e4 | 1027 | |
4a075e39 | 1028 | struct file_lock_context { |
6109c850 | 1029 | spinlock_t flc_lock; |
4a075e39 | 1030 | struct list_head flc_flock; |
bd61e0a9 | 1031 | struct list_head flc_posix; |
8634b51f | 1032 | struct list_head flc_lease; |
4a075e39 JL |
1033 | }; |
1034 | ||
1da177e4 LT |
1035 | /* The following constant reflects the upper bound of the file/locking space */ |
1036 | #ifndef OFFSET_MAX | |
1037 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1038 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1039 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1040 | #endif | |
1041 | ||
bfcd17a6 TP |
1042 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1043 | ||
c568d683 MS |
1044 | /* |
1045 | * Return the inode to use for locking | |
1046 | * | |
1047 | * For overlayfs this should be the overlay inode, not the real inode returned | |
1048 | * by file_inode(). For any other fs file_inode(filp) and locks_inode(filp) are | |
1049 | * equal. | |
1050 | */ | |
1051 | static inline struct inode *locks_inode(const struct file *f) | |
1052 | { | |
1053 | return f->f_path.dentry->d_inode; | |
1054 | } | |
1055 | ||
bfcd17a6 | 1056 | #ifdef CONFIG_FILE_LOCKING |
a75d30c7 | 1057 | extern int fcntl_getlk(struct file *, unsigned int, struct flock *); |
c293621b | 1058 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
a75d30c7 | 1059 | struct flock *); |
1da177e4 LT |
1060 | |
1061 | #if BITS_PER_LONG == 32 | |
a75d30c7 | 1062 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *); |
c293621b | 1063 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
a75d30c7 | 1064 | struct flock64 *); |
1da177e4 LT |
1065 | #endif |
1066 | ||
1da177e4 LT |
1067 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1068 | extern int fcntl_getlease(struct file *filp); | |
1069 | ||
1070 | /* fs/locks.c */ | |
f27a0fe0 | 1071 | void locks_free_lock_context(struct inode *inode); |
05fa3135 | 1072 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1073 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1074 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1075 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
3fe0fff1 | 1076 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
1da177e4 | 1077 | extern void locks_remove_posix(struct file *, fl_owner_t); |
78ed8a13 | 1078 | extern void locks_remove_file(struct file *); |
a9e61e25 | 1079 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1080 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1081 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
f891a29f | 1082 | extern int posix_unblock_lock(struct file_lock *); |
3ee17abd | 1083 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1084 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1085 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
e55c34a6 | 1086 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
df4e8d2c | 1087 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
1da177e4 | 1088 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
e6f5c789 JL |
1089 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
1090 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); | |
7448cc37 | 1091 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
6c8c9031 AV |
1092 | struct files_struct; |
1093 | extern void show_fd_locks(struct seq_file *f, | |
1094 | struct file *filp, struct files_struct *files); | |
bfcd17a6 | 1095 | #else /* !CONFIG_FILE_LOCKING */ |
c1e62b8f JL |
1096 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
1097 | struct flock __user *user) | |
c2aca5e5 SW |
1098 | { |
1099 | return -EINVAL; | |
1100 | } | |
1101 | ||
1102 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1103 | unsigned int cmd, struct flock __user *user) | |
1104 | { | |
1105 | return -EACCES; | |
1106 | } | |
1107 | ||
bfcd17a6 | 1108 | #if BITS_PER_LONG == 32 |
c1e62b8f JL |
1109 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
1110 | struct flock64 __user *user) | |
c2aca5e5 SW |
1111 | { |
1112 | return -EINVAL; | |
1113 | } | |
1114 | ||
1115 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1116 | unsigned int cmd, struct flock64 __user *user) | |
1117 | { | |
1118 | return -EACCES; | |
1119 | } | |
bfcd17a6 | 1120 | #endif |
c2aca5e5 SW |
1121 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1122 | { | |
1b2b32dc | 1123 | return -EINVAL; |
c2aca5e5 SW |
1124 | } |
1125 | ||
1126 | static inline int fcntl_getlease(struct file *filp) | |
1127 | { | |
1b2b32dc | 1128 | return F_UNLCK; |
c2aca5e5 SW |
1129 | } |
1130 | ||
4a075e39 | 1131 | static inline void |
f27a0fe0 | 1132 | locks_free_lock_context(struct inode *inode) |
4a075e39 JL |
1133 | { |
1134 | } | |
1135 | ||
c2aca5e5 SW |
1136 | static inline void locks_init_lock(struct file_lock *fl) |
1137 | { | |
1138 | return; | |
1139 | } | |
1140 | ||
3fe0fff1 | 1141 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
c2aca5e5 SW |
1142 | { |
1143 | return; | |
1144 | } | |
1145 | ||
1146 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1147 | { | |
1148 | return; | |
1149 | } | |
1150 | ||
1151 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1152 | { | |
1153 | return; | |
1154 | } | |
1155 | ||
78ed8a13 | 1156 | static inline void locks_remove_file(struct file *filp) |
c2aca5e5 SW |
1157 | { |
1158 | return; | |
1159 | } | |
1160 | ||
1161 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1162 | { | |
1163 | return; | |
1164 | } | |
1165 | ||
1166 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1167 | struct file_lock *conflock) | |
1168 | { | |
1169 | return -ENOLCK; | |
1170 | } | |
1171 | ||
f891a29f | 1172 | static inline int posix_unblock_lock(struct file_lock *waiter) |
c2aca5e5 SW |
1173 | { |
1174 | return -ENOENT; | |
1175 | } | |
1176 | ||
1177 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1178 | { | |
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1183 | struct file_lock *fl, struct file_lock *conf) | |
1184 | { | |
1185 | return -ENOLCK; | |
1186 | } | |
1187 | ||
1188 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1189 | { | |
1190 | return 0; | |
1191 | } | |
1192 | ||
e55c34a6 BC |
1193 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
1194 | { | |
1195 | return -ENOLCK; | |
1196 | } | |
1197 | ||
df4e8d2c | 1198 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
c2aca5e5 SW |
1199 | { |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) | |
1204 | { | |
1205 | return; | |
1206 | } | |
1207 | ||
1208 | static inline int generic_setlease(struct file *filp, long arg, | |
e6f5c789 | 1209 | struct file_lock **flp, void **priv) |
c2aca5e5 SW |
1210 | { |
1211 | return -EINVAL; | |
1212 | } | |
1213 | ||
1214 | static inline int vfs_setlease(struct file *filp, long arg, | |
e6f5c789 | 1215 | struct file_lock **lease, void **priv) |
c2aca5e5 SW |
1216 | { |
1217 | return -EINVAL; | |
1218 | } | |
1219 | ||
7448cc37 | 1220 | static inline int lease_modify(struct file_lock *fl, int arg, |
c45198ed | 1221 | struct list_head *dispose) |
c2aca5e5 SW |
1222 | { |
1223 | return -EINVAL; | |
1224 | } | |
6c8c9031 AV |
1225 | |
1226 | struct files_struct; | |
1227 | static inline void show_fd_locks(struct seq_file *f, | |
1228 | struct file *filp, struct files_struct *files) {} | |
bfcd17a6 TP |
1229 | #endif /* !CONFIG_FILE_LOCKING */ |
1230 | ||
ee296d7c JL |
1231 | static inline struct inode *file_inode(const struct file *f) |
1232 | { | |
1233 | return f->f_inode; | |
1234 | } | |
1235 | ||
d101a125 MS |
1236 | static inline struct dentry *file_dentry(const struct file *file) |
1237 | { | |
495e6429 | 1238 | return d_real(file->f_path.dentry, file_inode(file), 0, 0); |
d101a125 MS |
1239 | } |
1240 | ||
e55c34a6 BC |
1241 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
1242 | { | |
c568d683 | 1243 | return locks_lock_inode_wait(locks_inode(filp), fl); |
e55c34a6 BC |
1244 | } |
1245 | ||
1da177e4 | 1246 | struct fasync_struct { |
989a2979 ED |
1247 | spinlock_t fa_lock; |
1248 | int magic; | |
1249 | int fa_fd; | |
1250 | struct fasync_struct *fa_next; /* singly linked list */ | |
1251 | struct file *fa_file; | |
1252 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1253 | }; |
1254 | ||
1255 | #define FASYNC_MAGIC 0x4601 | |
1256 | ||
1257 | /* SMP safe fasync helpers: */ | |
1258 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1259 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1260 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1261 | extern struct fasync_struct *fasync_alloc(void); | |
1262 | extern void fasync_free(struct fasync_struct *); | |
1263 | ||
1da177e4 LT |
1264 | /* can be called from interrupts */ |
1265 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1266 | |
e0b93edd | 1267 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
393cc3f5 | 1268 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1da177e4 | 1269 | extern void f_delown(struct file *filp); |
609d7fa9 | 1270 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1271 | extern int send_sigurg(struct fown_struct *fown); |
1272 | ||
e462ec50 DH |
1273 | /* |
1274 | * sb->s_flags. Note that these mirror the equivalent MS_* flags where | |
1275 | * represented in both. | |
1276 | */ | |
1277 | #define SB_RDONLY 1 /* Mount read-only */ | |
1278 | #define SB_NOSUID 2 /* Ignore suid and sgid bits */ | |
1279 | #define SB_NODEV 4 /* Disallow access to device special files */ | |
1280 | #define SB_NOEXEC 8 /* Disallow program execution */ | |
1281 | #define SB_SYNCHRONOUS 16 /* Writes are synced at once */ | |
1282 | #define SB_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
1283 | #define SB_DIRSYNC 128 /* Directory modifications are synchronous */ | |
1284 | #define SB_NOATIME 1024 /* Do not update access times. */ | |
1285 | #define SB_NODIRATIME 2048 /* Do not update directory access times */ | |
1286 | #define SB_SILENT 32768 | |
1287 | #define SB_POSIXACL (1<<16) /* VFS does not apply the umask */ | |
1288 | #define SB_KERNMOUNT (1<<22) /* this is a kern_mount call */ | |
1289 | #define SB_I_VERSION (1<<23) /* Update inode I_version field */ | |
1290 | #define SB_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ | |
1291 | ||
1292 | /* These sb flags are internal to the kernel */ | |
1293 | #define SB_SUBMOUNT (1<<26) | |
1294 | #define SB_NOREMOTELOCK (1<<27) | |
1295 | #define SB_NOSEC (1<<28) | |
1296 | #define SB_BORN (1<<29) | |
1297 | #define SB_ACTIVE (1<<30) | |
1298 | #define SB_NOUSER (1<<31) | |
1299 | ||
1da177e4 LT |
1300 | /* |
1301 | * Umount options | |
1302 | */ | |
1303 | ||
1304 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1305 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1306 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1307 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1308 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 | 1309 | |
46b15caa TH |
1310 | /* sb->s_iflags */ |
1311 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ | |
90f8572b | 1312 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
a2982cc9 | 1313 | #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */ |
1da177e4 | 1314 | |
8654df4e EB |
1315 | /* sb->s_iflags to limit user namespace mounts */ |
1316 | #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */ | |
1da177e4 | 1317 | |
5accdf82 JK |
1318 | /* Possible states of 'frozen' field */ |
1319 | enum { | |
1320 | SB_UNFROZEN = 0, /* FS is unfrozen */ | |
1321 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ | |
5accdf82 JK |
1322 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1323 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop | |
1324 | * internal threads if needed) */ | |
1325 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ | |
1326 | }; | |
1327 | ||
1328 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) | |
1329 | ||
1330 | struct sb_writers { | |
8129ed29 ON |
1331 | int frozen; /* Is sb frozen? */ |
1332 | wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ | |
1333 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; | |
5accdf82 JK |
1334 | }; |
1335 | ||
1da177e4 LT |
1336 | struct super_block { |
1337 | struct list_head s_list; /* Keep this first */ | |
1338 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
270ba5f7 RK |
1339 | unsigned char s_blocksize_bits; |
1340 | unsigned long s_blocksize; | |
42cb56ae | 1341 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1342 | struct file_system_type *s_type; |
ee9b6d61 | 1343 | const struct super_operations *s_op; |
61e225dc | 1344 | const struct dquot_operations *dq_op; |
0d54b217 | 1345 | const struct quotactl_ops *s_qcop; |
39655164 | 1346 | const struct export_operations *s_export_op; |
1da177e4 | 1347 | unsigned long s_flags; |
46b15caa | 1348 | unsigned long s_iflags; /* internal SB_I_* flags */ |
1da177e4 LT |
1349 | unsigned long s_magic; |
1350 | struct dentry *s_root; | |
1351 | struct rw_semaphore s_umount; | |
1da177e4 | 1352 | int s_count; |
1da177e4 | 1353 | atomic_t s_active; |
50462062 | 1354 | #ifdef CONFIG_SECURITY |
1da177e4 | 1355 | void *s_security; |
50462062 | 1356 | #endif |
bb435453 | 1357 | const struct xattr_handler **s_xattr; |
1da177e4 | 1358 | |
0b81d077 JK |
1359 | const struct fscrypt_operations *s_cop; |
1360 | ||
ceb5bdc2 | 1361 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
39f7c4db | 1362 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1da177e4 | 1363 | struct block_device *s_bdev; |
32a88aa1 | 1364 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1365 | struct mtd_info *s_mtd; |
a5166169 | 1366 | struct hlist_node s_instances; |
2c5f648a | 1367 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
1da177e4 LT |
1368 | struct quota_info s_dquot; /* Diskquota specific options */ |
1369 | ||
5accdf82 | 1370 | struct sb_writers s_writers; |
1da177e4 | 1371 | |
85787090 CH |
1372 | char s_id[32]; /* Informational name */ |
1373 | uuid_t s_uuid; /* UUID */ | |
1da177e4 LT |
1374 | |
1375 | void *s_fs_info; /* Filesystem private info */ | |
8de52778 | 1376 | unsigned int s_max_links; |
30c40d2c | 1377 | fmode_t s_mode; |
1da177e4 | 1378 | |
270ba5f7 RK |
1379 | /* Granularity of c/m/atime in ns. |
1380 | Cannot be worse than a second */ | |
1381 | u32 s_time_gran; | |
1382 | ||
1da177e4 LT |
1383 | /* |
1384 | * The next field is for VFS *only*. No filesystems have any business | |
1385 | * even looking at it. You had been warned. | |
1386 | */ | |
a11f3a05 | 1387 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1388 | |
79c0b2df MS |
1389 | /* |
1390 | * Filesystem subtype. If non-empty the filesystem type field | |
1391 | * in /proc/mounts will be "type.subtype" | |
1392 | */ | |
1393 | char *s_subtype; | |
b3b304a2 | 1394 | |
c8aebb0c | 1395 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1396 | |
1397 | /* | |
1398 | * Saved pool identifier for cleancache (-1 means none) | |
1399 | */ | |
1400 | int cleancache_poolid; | |
b0d40c92 DC |
1401 | |
1402 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1403 | |
7ada4db8 MS |
1404 | /* Number of inodes with nlink == 0 but still referenced */ |
1405 | atomic_long_t s_remove_count; | |
1406 | ||
4ed5e82f MS |
1407 | /* Being remounted read-only */ |
1408 | int s_readonly_remount; | |
7b7a8665 CH |
1409 | |
1410 | /* AIO completions deferred from interrupt context */ | |
1411 | struct workqueue_struct *s_dio_done_wq; | |
215752fc | 1412 | struct hlist_head s_pins; |
f6041567 | 1413 | |
6e4eab57 EB |
1414 | /* |
1415 | * Owning user namespace and default context in which to | |
1416 | * interpret filesystem uids, gids, quotas, device nodes, | |
1417 | * xattrs and security labels. | |
1418 | */ | |
1419 | struct user_namespace *s_user_ns; | |
1420 | ||
f6041567 DC |
1421 | /* |
1422 | * Keep the lru lists last in the structure so they always sit on their | |
1423 | * own individual cachelines. | |
1424 | */ | |
1425 | struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; | |
1426 | struct list_lru s_inode_lru ____cacheline_aligned_in_smp; | |
e2fec7c3 | 1427 | struct rcu_head rcu; |
853b39a7 | 1428 | struct work_struct destroy_work; |
69c433ed | 1429 | |
e97fedb9 | 1430 | struct mutex s_sync_lock; /* sync serialisation lock */ |
69c433ed MS |
1431 | |
1432 | /* | |
1433 | * Indicates how deep in a filesystem stack this SB is | |
1434 | */ | |
1435 | int s_stack_depth; | |
74278da9 DC |
1436 | |
1437 | /* s_inode_list_lock protects s_inodes */ | |
1438 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; | |
1439 | struct list_head s_inodes; /* all inodes */ | |
6c60d2b5 DC |
1440 | |
1441 | spinlock_t s_inode_wblist_lock; | |
1442 | struct list_head s_inodes_wb; /* writeback inodes */ | |
3859a271 | 1443 | } __randomize_layout; |
1da177e4 | 1444 | |
81754357 SF |
1445 | /* Helper functions so that in most cases filesystems will |
1446 | * not need to deal directly with kuid_t and kgid_t and can | |
1447 | * instead deal with the raw numeric values that are stored | |
1448 | * in the filesystem. | |
1449 | */ | |
1450 | static inline uid_t i_uid_read(const struct inode *inode) | |
1451 | { | |
1452 | return from_kuid(inode->i_sb->s_user_ns, inode->i_uid); | |
1453 | } | |
1454 | ||
1455 | static inline gid_t i_gid_read(const struct inode *inode) | |
1456 | { | |
1457 | return from_kgid(inode->i_sb->s_user_ns, inode->i_gid); | |
1458 | } | |
1459 | ||
1460 | static inline void i_uid_write(struct inode *inode, uid_t uid) | |
1461 | { | |
1462 | inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid); | |
1463 | } | |
1464 | ||
1465 | static inline void i_gid_write(struct inode *inode, gid_t gid) | |
1466 | { | |
1467 | inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); | |
1468 | } | |
1469 | ||
3cd88666 | 1470 | extern struct timespec current_time(struct inode *inode); |
1da177e4 LT |
1471 | |
1472 | /* | |
1473 | * Snapshotting support. | |
1474 | */ | |
1da177e4 | 1475 | |
5accdf82 JK |
1476 | void __sb_end_write(struct super_block *sb, int level); |
1477 | int __sb_start_write(struct super_block *sb, int level, bool wait); | |
1478 | ||
bee9182d | 1479 | #define __sb_writers_acquired(sb, lev) \ |
8129ed29 | 1480 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1481 | #define __sb_writers_release(sb, lev) \ |
8129ed29 | 1482 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1483 | |
5accdf82 JK |
1484 | /** |
1485 | * sb_end_write - drop write access to a superblock | |
1486 | * @sb: the super we wrote to | |
1487 | * | |
1488 | * Decrement number of writers to the filesystem. Wake up possible waiters | |
1489 | * wanting to freeze the filesystem. | |
1490 | */ | |
1491 | static inline void sb_end_write(struct super_block *sb) | |
1492 | { | |
1493 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1494 | } | |
1495 | ||
1496 | /** | |
1497 | * sb_end_pagefault - drop write access to a superblock from a page fault | |
1498 | * @sb: the super we wrote to | |
1499 | * | |
1500 | * Decrement number of processes handling write page fault to the filesystem. | |
1501 | * Wake up possible waiters wanting to freeze the filesystem. | |
1502 | */ | |
1503 | static inline void sb_end_pagefault(struct super_block *sb) | |
1504 | { | |
1505 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); | |
1506 | } | |
1507 | ||
1508 | /** | |
1509 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes | |
1510 | * @sb: the super we wrote to | |
1511 | * | |
1512 | * Decrement fs-internal number of writers to the filesystem. Wake up possible | |
1513 | * waiters wanting to freeze the filesystem. | |
1514 | */ | |
1515 | static inline void sb_end_intwrite(struct super_block *sb) | |
1516 | { | |
1517 | __sb_end_write(sb, SB_FREEZE_FS); | |
1518 | } | |
1519 | ||
1520 | /** | |
1521 | * sb_start_write - get write access to a superblock | |
1522 | * @sb: the super we write to | |
1523 | * | |
1524 | * When a process wants to write data or metadata to a file system (i.e. dirty | |
1525 | * a page or an inode), it should embed the operation in a sb_start_write() - | |
1526 | * sb_end_write() pair to get exclusion against file system freezing. This | |
1527 | * function increments number of writers preventing freezing. If the file | |
1528 | * system is already frozen, the function waits until the file system is | |
1529 | * thawed. | |
1530 | * | |
1531 | * Since freeze protection behaves as a lock, users have to preserve | |
1532 | * ordering of freeze protection and other filesystem locks. Generally, | |
1533 | * freeze protection should be the outermost lock. In particular, we have: | |
1534 | * | |
1535 | * sb_start_write | |
1536 | * -> i_mutex (write path, truncate, directory ops, ...) | |
1537 | * -> s_umount (freeze_super, thaw_super) | |
1538 | */ | |
1539 | static inline void sb_start_write(struct super_block *sb) | |
1540 | { | |
1541 | __sb_start_write(sb, SB_FREEZE_WRITE, true); | |
1542 | } | |
1543 | ||
1544 | static inline int sb_start_write_trylock(struct super_block *sb) | |
1545 | { | |
1546 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); | |
1547 | } | |
1548 | ||
1549 | /** | |
1550 | * sb_start_pagefault - get write access to a superblock from a page fault | |
1551 | * @sb: the super we write to | |
1552 | * | |
1553 | * When a process starts handling write page fault, it should embed the | |
1554 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get | |
1555 | * exclusion against file system freezing. This is needed since the page fault | |
1556 | * is going to dirty a page. This function increments number of running page | |
1557 | * faults preventing freezing. If the file system is already frozen, the | |
1558 | * function waits until the file system is thawed. | |
1559 | * | |
1560 | * Since page fault freeze protection behaves as a lock, users have to preserve | |
1561 | * ordering of freeze protection and other filesystem locks. It is advised to | |
1562 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault | |
1563 | * handling code implies lock dependency: | |
1564 | * | |
1565 | * mmap_sem | |
1566 | * -> sb_start_pagefault | |
1567 | */ | |
1568 | static inline void sb_start_pagefault(struct super_block *sb) | |
1569 | { | |
1570 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); | |
1571 | } | |
1572 | ||
1573 | /* | |
1574 | * sb_start_intwrite - get write access to a superblock for internal fs purposes | |
1575 | * @sb: the super we write to | |
1576 | * | |
1577 | * This is the third level of protection against filesystem freezing. It is | |
1578 | * free for use by a filesystem. The only requirement is that it must rank | |
1579 | * below sb_start_pagefault. | |
1580 | * | |
1581 | * For example filesystem can call sb_start_intwrite() when starting a | |
1582 | * transaction which somewhat eases handling of freezing for internal sources | |
1583 | * of filesystem changes (internal fs threads, discarding preallocation on file | |
1584 | * close, etc.). | |
1585 | */ | |
1586 | static inline void sb_start_intwrite(struct super_block *sb) | |
1587 | { | |
1588 | __sb_start_write(sb, SB_FREEZE_FS, true); | |
1589 | } | |
1da177e4 | 1590 | |
1da177e4 | 1591 | |
2e149670 | 1592 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1593 | |
1da177e4 LT |
1594 | /* |
1595 | * VFS helper functions.. | |
1596 | */ | |
312b63fb | 1597 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 1598 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1599 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1600 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
146a8595 | 1601 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
1da177e4 | 1602 | extern int vfs_rmdir(struct inode *, struct dentry *); |
b21996e3 | 1603 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
520c8b16 | 1604 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
787fb6bc | 1605 | extern int vfs_whiteout(struct inode *, struct dentry *); |
1da177e4 | 1606 | |
af7bd4dc AG |
1607 | extern struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, |
1608 | int open_flag); | |
1609 | ||
8c744fb8 CH |
1610 | /* |
1611 | * VFS file helper functions. | |
1612 | */ | |
a1bd120d | 1613 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1614 | umode_t mode); |
a2982cc9 | 1615 | extern bool may_open_dev(const struct path *path); |
c4b929b8 MF |
1616 | /* |
1617 | * VFS FS_IOC_FIEMAP helper definitions. | |
1618 | */ | |
1619 | struct fiemap_extent_info { | |
1620 | unsigned int fi_flags; /* Flags as passed from user */ | |
1621 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1622 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1623 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1624 | fiemap_extent array */ | |
c4b929b8 MF |
1625 | }; |
1626 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1627 | u64 phys, u64 len, u32 flags); | |
1628 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1629 | ||
1da177e4 LT |
1630 | /* |
1631 | * File types | |
1632 | * | |
1633 | * NOTE! These match bits 12..15 of stat.st_mode | |
1634 | * (ie "(i_mode >> 12) & 15"). | |
1635 | */ | |
1636 | #define DT_UNKNOWN 0 | |
1637 | #define DT_FIFO 1 | |
1638 | #define DT_CHR 2 | |
1639 | #define DT_DIR 4 | |
1640 | #define DT_BLK 6 | |
1641 | #define DT_REG 8 | |
1642 | #define DT_LNK 10 | |
1643 | #define DT_SOCK 12 | |
1644 | #define DT_WHT 14 | |
1645 | ||
1da177e4 LT |
1646 | /* |
1647 | * This is the "filldir" function type, used by readdir() to let | |
1648 | * the kernel specify what kind of dirent layout it wants to have. | |
1649 | * This allows the kernel to read directories into kernel space or | |
1650 | * to have different dirent layouts depending on the binary type. | |
1651 | */ | |
ac7576f4 MS |
1652 | struct dir_context; |
1653 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, | |
1654 | unsigned); | |
1655 | ||
5c0ba4e0 | 1656 | struct dir_context { |
ac6614b7 | 1657 | const filldir_t actor; |
bb6f619b | 1658 | loff_t pos; |
5c0ba4e0 | 1659 | }; |
bb6f619b | 1660 | |
08f85851 | 1661 | struct block_device_operations; |
1da177e4 | 1662 | |
1da177e4 LT |
1663 | /* These macros are for out of kernel modules to test that |
1664 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1665 | * fields in struct file_operations. */ | |
1666 | #define HAVE_COMPAT_IOCTL 1 | |
1667 | #define HAVE_UNLOCKED_IOCTL 1 | |
1668 | ||
b4caecd4 CH |
1669 | /* |
1670 | * These flags let !MMU mmap() govern direct device mapping vs immediate | |
1671 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. | |
1672 | * | |
1673 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) | |
1674 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) | |
1675 | * NOMMU_MAP_READ: Can be mapped for reading | |
1676 | * NOMMU_MAP_WRITE: Can be mapped for writing | |
1677 | * NOMMU_MAP_EXEC: Can be mapped for execution | |
1678 | */ | |
1679 | #define NOMMU_MAP_COPY 0x00000001 | |
1680 | #define NOMMU_MAP_DIRECT 0x00000008 | |
1681 | #define NOMMU_MAP_READ VM_MAYREAD | |
1682 | #define NOMMU_MAP_WRITE VM_MAYWRITE | |
1683 | #define NOMMU_MAP_EXEC VM_MAYEXEC | |
1684 | ||
1685 | #define NOMMU_VMFLAGS \ | |
1686 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) | |
1687 | ||
1688 | ||
293bc982 AV |
1689 | struct iov_iter; |
1690 | ||
1da177e4 LT |
1691 | struct file_operations { |
1692 | struct module *owner; | |
1693 | loff_t (*llseek) (struct file *, loff_t, int); | |
1694 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1695 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
293bc982 AV |
1696 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
1697 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); | |
bb6f619b | 1698 | int (*iterate) (struct file *, struct dir_context *); |
61922694 | 1699 | int (*iterate_shared) (struct file *, struct dir_context *); |
1da177e4 | 1700 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
1da177e4 LT |
1701 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1702 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1703 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1704 | int (*open) (struct inode *, struct file *); | |
75e1fcc0 | 1705 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1706 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1707 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1708 | int (*fasync) (int, struct file *, int); |
1709 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1710 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1711 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1712 | int (*check_flags)(int); | |
1da177e4 | 1713 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1714 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1715 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
e6f5c789 | 1716 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
2fe17c10 CH |
1717 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1718 | loff_t len); | |
a3816ab0 | 1719 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
b4caecd4 CH |
1720 | #ifndef CONFIG_MMU |
1721 | unsigned (*mmap_capabilities)(struct file *); | |
1722 | #endif | |
04b38d60 CH |
1723 | ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, |
1724 | loff_t, size_t, unsigned int); | |
1725 | int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t, | |
1726 | u64); | |
54dbc151 DW |
1727 | ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *, |
1728 | u64); | |
3859a271 | 1729 | } __randomize_layout; |
1da177e4 LT |
1730 | |
1731 | struct inode_operations { | |
00cd8dd3 | 1732 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
fceef393 | 1733 | const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); |
10556cb2 | 1734 | int (*permission) (struct inode *, int); |
4e34e719 | 1735 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1736 | |
1737 | int (*readlink) (struct dentry *, char __user *,int); | |
44a7d7a8 | 1738 | |
ebfc3b49 | 1739 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1da177e4 LT |
1740 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1741 | int (*unlink) (struct inode *,struct dentry *); | |
1742 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1743 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1744 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1745 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 1746 | int (*rename) (struct inode *, struct dentry *, |
520c8b16 | 1747 | struct inode *, struct dentry *, unsigned int); |
1da177e4 | 1748 | int (*setattr) (struct dentry *, struct iattr *); |
a528d35e | 1749 | int (*getattr) (const struct path *, struct kstat *, u32, unsigned int); |
1da177e4 | 1750 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
c4b929b8 MF |
1751 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1752 | u64 len); | |
c3b2da31 | 1753 | int (*update_time)(struct inode *, struct timespec *, int); |
d9585277 | 1754 | int (*atomic_open)(struct inode *, struct dentry *, |
30d90494 | 1755 | struct file *, unsigned open_flag, |
d9585277 | 1756 | umode_t create_mode, int *opened); |
60545d0d | 1757 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
893d46e4 | 1758 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
44a7d7a8 | 1759 | } ____cacheline_aligned; |
1da177e4 | 1760 | |
bb7462b6 MS |
1761 | static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio, |
1762 | struct iov_iter *iter) | |
1763 | { | |
1764 | return file->f_op->read_iter(kio, iter); | |
1765 | } | |
1766 | ||
1767 | static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio, | |
1768 | struct iov_iter *iter) | |
1769 | { | |
1770 | return file->f_op->write_iter(kio, iter); | |
1771 | } | |
1772 | ||
f74ac015 MS |
1773 | static inline int call_mmap(struct file *file, struct vm_area_struct *vma) |
1774 | { | |
1775 | return file->f_op->mmap(file, vma); | |
1776 | } | |
1777 | ||
eed4e51f | 1778 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1779 | unsigned long nr_segs, unsigned long fast_segs, |
1780 | struct iovec *fast_pointer, | |
ac34ebb3 | 1781 | struct iovec **ret_pointer); |
eed4e51f | 1782 | |
6fb5032e | 1783 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); |
1da177e4 LT |
1784 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1785 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1786 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
ddef7ed2 | 1787 | unsigned long, loff_t *, rwf_t); |
29732938 ZB |
1788 | extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, |
1789 | loff_t, size_t, unsigned int); | |
876bec6f DW |
1790 | extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in, |
1791 | struct inode *inode_out, loff_t pos_out, | |
1792 | u64 *len, bool is_dedupe); | |
04b38d60 CH |
1793 | extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in, |
1794 | struct file *file_out, loff_t pos_out, u64 len); | |
876bec6f DW |
1795 | extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, |
1796 | struct inode *dest, loff_t destoff, | |
1797 | loff_t len, bool *is_same); | |
54dbc151 DW |
1798 | extern int vfs_dedupe_file_range(struct file *file, |
1799 | struct file_dedupe_range *same); | |
1da177e4 | 1800 | |
1da177e4 LT |
1801 | struct super_operations { |
1802 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1803 | void (*destroy_inode)(struct inode *); | |
1804 | ||
aa385729 | 1805 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1806 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1807 | int (*drop_inode) (struct inode *); |
be7ce416 | 1808 | void (*evict_inode) (struct inode *); |
1da177e4 | 1809 | void (*put_super) (struct super_block *); |
1da177e4 | 1810 | int (*sync_fs)(struct super_block *sb, int wait); |
48b6bca6 | 1811 | int (*freeze_super) (struct super_block *); |
c4be0c1d | 1812 | int (*freeze_fs) (struct super_block *); |
48b6bca6 | 1813 | int (*thaw_super) (struct super_block *); |
c4be0c1d | 1814 | int (*unfreeze_fs) (struct super_block *); |
726c3342 | 1815 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1816 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1817 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1818 | |
34c80b1d | 1819 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1820 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1821 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1822 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1823 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1824 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1825 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
2d0fa467 | 1826 | struct dquot **(*get_dquots)(struct inode *); |
0e51a720 | 1827 | #endif |
87d8fe1e | 1828 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
4101b624 VD |
1829 | long (*nr_cached_objects)(struct super_block *, |
1830 | struct shrink_control *); | |
1831 | long (*free_cached_objects)(struct super_block *, | |
1832 | struct shrink_control *); | |
1da177e4 LT |
1833 | }; |
1834 | ||
bbc1096a DH |
1835 | /* |
1836 | * Inode flags - they have no relation to superblock flags now | |
1837 | */ | |
1838 | #define S_SYNC 1 /* Writes are synced at once */ | |
1839 | #define S_NOATIME 2 /* Do not update access times */ | |
1840 | #define S_APPEND 4 /* Append-only file */ | |
1841 | #define S_IMMUTABLE 8 /* Immutable file */ | |
1842 | #define S_DEAD 16 /* removed, but still open directory */ | |
1843 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
1844 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
1845 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
1846 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
1847 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
1848 | #define S_IMA 1024 /* Inode has an associated IMA struct */ | |
1849 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ | |
1850 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ | |
6cd176a5 | 1851 | #ifdef CONFIG_FS_DAX |
fbbbad4b MW |
1852 | #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
1853 | #else | |
1854 | #define S_DAX 0 /* Make all the DAX code disappear */ | |
1855 | #endif | |
bbc1096a DH |
1856 | |
1857 | /* | |
1858 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
1859 | * flags just means all the inodes inherit those flags by default. It might be | |
1860 | * possible to override it selectively if you really wanted to with some | |
1861 | * ioctl() that is not currently implemented. | |
1862 | * | |
e462ec50 | 1863 | * Exception: SB_RDONLY is always applied to the entire file system. |
bbc1096a DH |
1864 | * |
1865 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
1866 | * with files in use. This means that all of the inodes will not have their | |
1867 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
1868 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
1869 | */ | |
1870 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) | |
1871 | ||
94e92e7a DH |
1872 | static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & MS_RDONLY; } |
1873 | #define IS_RDONLY(inode) sb_rdonly((inode)->i_sb) | |
e462ec50 | 1874 | #define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \ |
bbc1096a | 1875 | ((inode)->i_flags & S_SYNC)) |
e462ec50 | 1876 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \ |
bbc1096a | 1877 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
e462ec50 DH |
1878 | #define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK) |
1879 | #define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME) | |
1880 | #define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION) | |
bbc1096a DH |
1881 | |
1882 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
1883 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
1884 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
e462ec50 | 1885 | #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL) |
bbc1096a DH |
1886 | |
1887 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
1888 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
1889 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
1890 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
1891 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) | |
1892 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) | |
1893 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) | |
fbbbad4b | 1894 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
bbc1096a | 1895 | |
787fb6bc MS |
1896 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
1897 | (inode)->i_rdev == WHITEOUT_DEV) | |
1898 | ||
0bd23d09 EB |
1899 | static inline bool HAS_UNMAPPED_ID(struct inode *inode) |
1900 | { | |
1901 | return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid); | |
1902 | } | |
1903 | ||
c75b1d94 JA |
1904 | static inline enum rw_hint file_write_hint(struct file *file) |
1905 | { | |
1906 | if (file->f_write_hint != WRITE_LIFE_NOT_SET) | |
1907 | return file->f_write_hint; | |
1908 | ||
1909 | return file_inode(file)->i_write_hint; | |
1910 | } | |
1911 | ||
1912 | static inline int iocb_flags(struct file *file); | |
1913 | ||
1914 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) | |
1915 | { | |
1916 | *kiocb = (struct kiocb) { | |
1917 | .ki_filp = filp, | |
1918 | .ki_flags = iocb_flags(filp), | |
1919 | .ki_hint = file_write_hint(filp), | |
1920 | }; | |
1921 | } | |
1922 | ||
1c0eeaf5 | 1923 | /* |
250df6ed | 1924 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
1925 | * |
1926 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
1927 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
1928 | * | |
1929 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
1930 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
1931 | * various stages of removing an inode. | |
1932 | * | |
eaff8079 | 1933 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 1934 | * |
e7ca2d41 JE |
1935 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
1936 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
1937 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
1938 | * these changes separately from I_DIRTY_SYNC so that we | |
1939 | * don't have to write inode on fdatasync() when only | |
1940 | * mtime has changed in it. | |
1c0eeaf5 | 1941 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
1942 | * I_NEW Serves as both a mutex and completion notification. |
1943 | * New inodes set I_NEW. If two processes both create | |
1944 | * the same inode, one of them will release its inode and | |
1945 | * wait for I_NEW to be released before returning. | |
1946 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
1947 | * also cause waiting on I_NEW, without I_NEW actually | |
1948 | * being set. find_inode() uses this to prevent returning | |
1949 | * nearly-dead inodes. | |
1c0eeaf5 JE |
1950 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
1951 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
1952 | * cleared. | |
1953 | * I_FREEING Set when inode is about to be freed but still has dirty | |
1954 | * pages or buffers attached or the inode itself is still | |
1955 | * dirty. | |
dbd5768f JK |
1956 | * I_CLEAR Added by clear_inode(). In this state the inode is |
1957 | * clean and can be destroyed. Inode keeps I_FREEING. | |
1c0eeaf5 JE |
1958 | * |
1959 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
1960 | * prohibited for many purposes. iget() must wait for | |
1961 | * the inode to be completely released, then create it | |
1962 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 1963 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 1964 | * |
169ebd90 JK |
1965 | * I_SYNC Writeback of inode is running. The bit is set during |
1966 | * data writeback, and cleared with a wakeup on the bit | |
1967 | * address once it is done. The bit is also used to pin | |
1968 | * the inode in memory for flusher thread. | |
1c0eeaf5 | 1969 | * |
bd5fe6c5 CH |
1970 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
1971 | * | |
1972 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
1973 | * | |
682aa8e1 TH |
1974 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
1975 | * synchronize competing switching instances and to tell | |
1976 | * wb stat updates to grab mapping->tree_lock. See | |
1977 | * inode_switch_wb_work_fn() for details. | |
1978 | * | |
ad0af710 AG |
1979 | * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper |
1980 | * and work dirs among overlayfs mounts. | |
1981 | * | |
1c0eeaf5 | 1982 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 1983 | */ |
9e38d86f NP |
1984 | #define I_DIRTY_SYNC (1 << 0) |
1985 | #define I_DIRTY_DATASYNC (1 << 1) | |
1986 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
1987 | #define __I_NEW 3 |
1988 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
1989 | #define I_WILL_FREE (1 << 4) |
1990 | #define I_FREEING (1 << 5) | |
1991 | #define I_CLEAR (1 << 6) | |
eaff8079 | 1992 | #define __I_SYNC 7 |
1c0eeaf5 | 1993 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 1994 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 | 1995 | #define __I_DIO_WAKEUP 9 |
ac74d8d6 | 1996 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
f4e0c30c | 1997 | #define I_LINKABLE (1 << 10) |
0ae45f63 TT |
1998 | #define I_DIRTY_TIME (1 << 11) |
1999 | #define __I_DIRTY_TIME_EXPIRED 12 | |
2000 | #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) | |
682aa8e1 | 2001 | #define I_WB_SWITCH (1 << 13) |
ad0af710 | 2002 | #define I_OVL_INUSE (1 << 14) |
1da177e4 LT |
2003 | |
2004 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) | |
0ae45f63 | 2005 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
1da177e4 LT |
2006 | |
2007 | extern void __mark_inode_dirty(struct inode *, int); | |
2008 | static inline void mark_inode_dirty(struct inode *inode) | |
2009 | { | |
2010 | __mark_inode_dirty(inode, I_DIRTY); | |
2011 | } | |
2012 | ||
2013 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
2014 | { | |
2015 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
2016 | } | |
2017 | ||
7ada4db8 MS |
2018 | extern void inc_nlink(struct inode *inode); |
2019 | extern void drop_nlink(struct inode *inode); | |
2020 | extern void clear_nlink(struct inode *inode); | |
2021 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
2022 | |
2023 | static inline void inode_inc_link_count(struct inode *inode) | |
2024 | { | |
2025 | inc_nlink(inode); | |
66d21730 AD |
2026 | mark_inode_dirty(inode); |
2027 | } | |
2028 | ||
9a53c3a7 DH |
2029 | static inline void inode_dec_link_count(struct inode *inode) |
2030 | { | |
2031 | drop_nlink(inode); | |
66d21730 AD |
2032 | mark_inode_dirty(inode); |
2033 | } | |
2034 | ||
25ec56b5 JNC |
2035 | /** |
2036 | * inode_inc_iversion - increments i_version | |
2037 | * @inode: inode that need to be updated | |
2038 | * | |
2039 | * Every time the inode is modified, the i_version field will be incremented. | |
2040 | * The filesystem has to be mounted with i_version flag | |
2041 | */ | |
2042 | ||
2043 | static inline void inode_inc_iversion(struct inode *inode) | |
2044 | { | |
2045 | spin_lock(&inode->i_lock); | |
2046 | inode->i_version++; | |
2047 | spin_unlock(&inode->i_lock); | |
2048 | } | |
2049 | ||
c3b2da31 JB |
2050 | enum file_time_flags { |
2051 | S_ATIME = 1, | |
2052 | S_MTIME = 2, | |
2053 | S_CTIME = 4, | |
2054 | S_VERSION = 8, | |
2055 | }; | |
2056 | ||
badcf2b7 | 2057 | extern void touch_atime(const struct path *); |
1da177e4 LT |
2058 | static inline void file_accessed(struct file *file) |
2059 | { | |
2060 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 2061 | touch_atime(&file->f_path); |
1da177e4 LT |
2062 | } |
2063 | ||
2064 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 2065 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 2066 | |
1da177e4 LT |
2067 | struct file_system_type { |
2068 | const char *name; | |
2069 | int fs_flags; | |
bbc1096a DH |
2070 | #define FS_REQUIRES_DEV 1 |
2071 | #define FS_BINARY_MOUNTDATA 2 | |
2072 | #define FS_HAS_SUBTYPE 4 | |
0c55cfc4 | 2073 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
bbc1096a | 2074 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
c96e41e9 AV |
2075 | struct dentry *(*mount) (struct file_system_type *, int, |
2076 | const char *, void *); | |
1da177e4 LT |
2077 | void (*kill_sb) (struct super_block *); |
2078 | struct module *owner; | |
2079 | struct file_system_type * next; | |
a5166169 | 2080 | struct hlist_head fs_supers; |
d475fd42 | 2081 | |
cf516249 | 2082 | struct lock_class_key s_lock_key; |
897c6ff9 | 2083 | struct lock_class_key s_umount_key; |
51ee049e | 2084 | struct lock_class_key s_vfs_rename_key; |
5accdf82 | 2085 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
d475fd42 PZ |
2086 | |
2087 | struct lock_class_key i_lock_key; | |
2088 | struct lock_class_key i_mutex_key; | |
14358e6d | 2089 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
2090 | }; |
2091 | ||
7f78e035 EB |
2092 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
2093 | ||
d91ee87d EB |
2094 | extern struct dentry *mount_ns(struct file_system_type *fs_type, |
2095 | int flags, void *data, void *ns, struct user_namespace *user_ns, | |
2096 | int (*fill_super)(struct super_block *, void *, int)); | |
152a0836 AV |
2097 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2098 | int flags, const char *dev_name, void *data, | |
2099 | int (*fill_super)(struct super_block *, void *, int)); | |
fc14f2fe AV |
2100 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2101 | int flags, void *data, | |
2102 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
2103 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2104 | int flags, void *data, | |
2105 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 2106 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 LT |
2107 | void generic_shutdown_super(struct super_block *sb); |
2108 | void kill_block_super(struct super_block *sb); | |
2109 | void kill_anon_super(struct super_block *sb); | |
2110 | void kill_litter_super(struct super_block *sb); | |
2111 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 2112 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 2113 | int set_anon_super(struct super_block *s, void *data); |
0ee5dc67 AV |
2114 | int get_anon_bdev(dev_t *); |
2115 | void free_anon_bdev(dev_t); | |
6e4eab57 EB |
2116 | struct super_block *sget_userns(struct file_system_type *type, |
2117 | int (*test)(struct super_block *,void *), | |
2118 | int (*set)(struct super_block *,void *), | |
2119 | int flags, struct user_namespace *user_ns, | |
2120 | void *data); | |
1da177e4 LT |
2121 | struct super_block *sget(struct file_system_type *type, |
2122 | int (*test)(struct super_block *,void *), | |
2123 | int (*set)(struct super_block *,void *), | |
9249e17f | 2124 | int flags, void *data); |
bba0bd31 AG |
2125 | extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *, |
2126 | const struct super_operations *ops, | |
2127 | const struct xattr_handler **xattr, | |
2128 | const struct dentry_operations *dops, | |
2129 | unsigned long); | |
2130 | ||
2131 | static inline struct dentry * | |
2132 | mount_pseudo(struct file_system_type *fs_type, char *name, | |
2133 | const struct super_operations *ops, | |
2134 | const struct dentry_operations *dops, unsigned long magic) | |
2135 | { | |
2136 | return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic); | |
2137 | } | |
1da177e4 LT |
2138 | |
2139 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
2140 | #define fops_get(fops) \ | |
2141 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
2142 | #define fops_put(fops) \ | |
2143 | do { if (fops) module_put((fops)->owner); } while(0) | |
e84f9e57 AV |
2144 | /* |
2145 | * This one is to be used *ONLY* from ->open() instances. | |
2146 | * fops must be non-NULL, pinned down *and* module dependencies | |
2147 | * should be sufficient to pin the caller down as well. | |
2148 | */ | |
2149 | #define replace_fops(f, fops) \ | |
2150 | do { \ | |
2151 | struct file *__file = (f); \ | |
2152 | fops_put(__file->f_op); \ | |
2153 | BUG_ON(!(__file->f_op = (fops))); \ | |
2154 | } while(0) | |
1da177e4 LT |
2155 | |
2156 | extern int register_filesystem(struct file_system_type *); | |
2157 | extern int unregister_filesystem(struct file_system_type *); | |
8bf9725c PE |
2158 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
2159 | #define kern_mount(type) kern_mount_data(type, NULL) | |
423e0ab0 | 2160 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
2161 | extern int may_umount_tree(struct vfsmount *); |
2162 | extern int may_umount(struct vfsmount *); | |
5e6123f3 SL |
2163 | extern long do_mount(const char *, const char __user *, |
2164 | const char *, unsigned long, void *); | |
ca71cf71 | 2165 | extern struct vfsmount *collect_mounts(const struct path *); |
8aec0809 | 2166 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
2167 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
2168 | struct vfsmount *); | |
f0bb5aaf | 2169 | extern int vfs_statfs(const struct path *, struct kstatfs *); |
c8b91acc AV |
2170 | extern int user_statfs(const char __user *, struct kstatfs *); |
2171 | extern int fd_statfs(int, struct kstatfs *); | |
cf31e70d | 2172 | extern int vfs_ustat(dev_t, struct kstatfs *); |
18e9e510 JB |
2173 | extern int freeze_super(struct super_block *super); |
2174 | extern int thaw_super(struct super_block *super); | |
02125a82 | 2175 | extern bool our_mnt(struct vfsmount *mnt); |
fca39346 JK |
2176 | extern __printf(2, 3) |
2177 | int super_setup_bdi_name(struct super_block *sb, char *fmt, ...); | |
2178 | extern int super_setup_bdi(struct super_block *sb); | |
1da177e4 | 2179 | |
ce3b0f8d AV |
2180 | extern int current_umask(void); |
2181 | ||
5a14696c BF |
2182 | extern void ihold(struct inode * inode); |
2183 | extern void iput(struct inode *); | |
0ae45f63 | 2184 | extern int generic_update_time(struct inode *, struct timespec *, int); |
5a14696c | 2185 | |
f87fd4c2 | 2186 | /* /sys/fs */ |
00d26666 | 2187 | extern struct kobject *fs_kobj; |
f87fd4c2 | 2188 | |
09cbfeaf | 2189 | #define MAX_RW_COUNT (INT_MAX & PAGE_MASK) |
bfcd17a6 | 2190 | |
9e8925b6 | 2191 | #ifdef CONFIG_MANDATORY_FILE_LOCKING |
d7a06983 | 2192 | extern int locks_mandatory_locked(struct file *); |
acc15575 | 2193 | extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char); |
1da177e4 LT |
2194 | |
2195 | /* | |
2196 | * Candidates for mandatory locking have the setgid bit set | |
2197 | * but no group execute bit - an otherwise meaningless combination. | |
2198 | */ | |
a16877ca PE |
2199 | |
2200 | static inline int __mandatory_lock(struct inode *ino) | |
2201 | { | |
2202 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
2203 | } | |
2204 | ||
2205 | /* | |
e462ec50 | 2206 | * ... and these candidates should be on SB_MANDLOCK mounted fs, |
a16877ca PE |
2207 | * otherwise these will be advisory locks |
2208 | */ | |
2209 | ||
2210 | static inline int mandatory_lock(struct inode *ino) | |
2211 | { | |
2212 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
2213 | } | |
1da177e4 | 2214 | |
d7a06983 | 2215 | static inline int locks_verify_locked(struct file *file) |
1da177e4 | 2216 | { |
c568d683 | 2217 | if (mandatory_lock(locks_inode(file))) |
d7a06983 | 2218 | return locks_mandatory_locked(file); |
1da177e4 LT |
2219 | return 0; |
2220 | } | |
2221 | ||
1da177e4 | 2222 | static inline int locks_verify_truncate(struct inode *inode, |
acc15575 | 2223 | struct file *f, |
1da177e4 LT |
2224 | loff_t size) |
2225 | { | |
acc15575 CH |
2226 | if (!inode->i_flctx || !mandatory_lock(inode)) |
2227 | return 0; | |
2228 | ||
2229 | if (size < inode->i_size) { | |
2230 | return locks_mandatory_area(inode, f, size, inode->i_size - 1, | |
2231 | F_WRLCK); | |
2232 | } else { | |
2233 | return locks_mandatory_area(inode, f, inode->i_size, size - 1, | |
2234 | F_WRLCK); | |
2235 | } | |
1da177e4 LT |
2236 | } |
2237 | ||
9e8925b6 JL |
2238 | #else /* !CONFIG_MANDATORY_FILE_LOCKING */ |
2239 | ||
2240 | static inline int locks_mandatory_locked(struct file *file) | |
2241 | { | |
2242 | return 0; | |
2243 | } | |
2244 | ||
fce205e9 LT |
2245 | static inline int locks_mandatory_area(struct inode *inode, struct file *filp, |
2246 | loff_t start, loff_t end, unsigned char type) | |
9e8925b6 JL |
2247 | { |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | static inline int __mandatory_lock(struct inode *inode) | |
2252 | { | |
2253 | return 0; | |
2254 | } | |
2255 | ||
2256 | static inline int mandatory_lock(struct inode *inode) | |
2257 | { | |
2258 | return 0; | |
2259 | } | |
2260 | ||
2261 | static inline int locks_verify_locked(struct file *file) | |
2262 | { | |
2263 | return 0; | |
2264 | } | |
2265 | ||
2266 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
2267 | size_t size) | |
2268 | { | |
2269 | return 0; | |
2270 | } | |
2271 | ||
2272 | #endif /* CONFIG_MANDATORY_FILE_LOCKING */ | |
2273 | ||
2274 | ||
2275 | #ifdef CONFIG_FILE_LOCKING | |
1da177e4 LT |
2276 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2277 | { | |
24cbe784 JL |
2278 | /* |
2279 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2280 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2281 | * could end up racing with tasks trying to set a new lease on this | |
2282 | * file. | |
24cbe784 JL |
2283 | */ |
2284 | smp_mb(); | |
8634b51f | 2285 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2286 | return __break_lease(inode, mode, FL_LEASE); |
1da177e4 LT |
2287 | return 0; |
2288 | } | |
df4e8d2c BF |
2289 | |
2290 | static inline int break_deleg(struct inode *inode, unsigned int mode) | |
2291 | { | |
962bd40b JL |
2292 | /* |
2293 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2294 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2295 | * could end up racing with tasks trying to set a new lease on this | |
2296 | * file. | |
962bd40b JL |
2297 | */ |
2298 | smp_mb(); | |
8634b51f | 2299 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2300 | return __break_lease(inode, mode, FL_DELEG); |
1da177e4 LT |
2301 | return 0; |
2302 | } | |
df4e8d2c | 2303 | |
5a14696c BF |
2304 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2305 | { | |
2306 | int ret; | |
2307 | ||
2308 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); | |
2309 | if (ret == -EWOULDBLOCK && delegated_inode) { | |
2310 | *delegated_inode = inode; | |
2311 | ihold(inode); | |
2312 | } | |
2313 | return ret; | |
2314 | } | |
2315 | ||
2316 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2317 | { | |
2318 | int ret; | |
2319 | ||
2320 | ret = break_deleg(*delegated_inode, O_WRONLY); | |
2321 | iput(*delegated_inode); | |
2322 | *delegated_inode = NULL; | |
2323 | return ret; | |
2324 | } | |
2325 | ||
11afe9f7 CH |
2326 | static inline int break_layout(struct inode *inode, bool wait) |
2327 | { | |
2328 | smp_mb(); | |
2329 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) | |
2330 | return __break_lease(inode, | |
2331 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, | |
2332 | FL_LAYOUT); | |
2333 | return 0; | |
2334 | } | |
2335 | ||
bfcd17a6 | 2336 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
2337 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2338 | { | |
2339 | return 0; | |
2340 | } | |
2341 | ||
df4e8d2c BF |
2342 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2343 | { | |
2344 | return 0; | |
2345 | } | |
5a14696c BF |
2346 | |
2347 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) | |
2348 | { | |
2349 | return 0; | |
2350 | } | |
2351 | ||
2352 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2353 | { | |
2354 | BUG(); | |
2355 | return 0; | |
2356 | } | |
2357 | ||
11afe9f7 CH |
2358 | static inline int break_layout(struct inode *inode, bool wait) |
2359 | { | |
2360 | return 0; | |
2361 | } | |
2362 | ||
bfcd17a6 | 2363 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2364 | |
2365 | /* fs/open.c */ | |
adb5c247 | 2366 | struct audit_names; |
91a27b2a | 2367 | struct filename { |
adb5c247 JL |
2368 | const char *name; /* pointer to actual string */ |
2369 | const __user char *uptr; /* original userland pointer */ | |
2370 | struct audit_names *aname; | |
55422d0b | 2371 | int refcnt; |
fd2f7cb5 | 2372 | const char iname[]; |
91a27b2a | 2373 | }; |
1da177e4 | 2374 | |
7df818b2 | 2375 | extern long vfs_truncate(const struct path *, loff_t); |
4a30131e N |
2376 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2377 | struct file *filp); | |
72c72bdf | 2378 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
3e63cbb1 | 2379 | loff_t len); |
8e8a1407 | 2380 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd | 2381 | umode_t mode); |
669abf4e | 2382 | extern struct file *file_open_name(struct filename *, int, umode_t); |
a218d0fd | 2383 | extern struct file *filp_open(const char *, int, umode_t); |
73d049a4 | 2384 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
378c6520 | 2385 | const char *, int, umode_t); |
765927b2 | 2386 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
1da177e4 | 2387 | extern int filp_close(struct file *, fl_owner_t id); |
91a27b2a | 2388 | |
51f39a1f | 2389 | extern struct filename *getname_flags(const char __user *, int, int *); |
91a27b2a | 2390 | extern struct filename *getname(const char __user *); |
c4ad8f98 | 2391 | extern struct filename *getname_kernel(const char *); |
55422d0b | 2392 | extern void putname(struct filename *name); |
91a27b2a | 2393 | |
47237687 AV |
2394 | enum { |
2395 | FILE_CREATED = 1, | |
2396 | FILE_OPENED = 2 | |
2397 | }; | |
30d90494 AV |
2398 | extern int finish_open(struct file *file, struct dentry *dentry, |
2399 | int (*open)(struct inode *, struct file *), | |
2400 | int *opened); | |
e45198a6 | 2401 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
1da177e4 | 2402 | |
3e63cbb1 AJ |
2403 | /* fs/ioctl.c */ |
2404 | ||
2405 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2406 | ||
1da177e4 LT |
2407 | /* fs/dcache.c */ |
2408 | extern void __init vfs_caches_init_early(void); | |
4248b0da | 2409 | extern void __init vfs_caches_init(void); |
1da177e4 | 2410 | |
b86c089b CL |
2411 | extern struct kmem_cache *names_cachep; |
2412 | ||
a608ca21 | 2413 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
3446a8aa | 2414 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1da177e4 | 2415 | |
9361401e | 2416 | #ifdef CONFIG_BLOCK |
1da177e4 | 2417 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2418 | extern void unregister_blkdev(unsigned int, const char *); |
f44f1ab5 | 2419 | extern void bdev_unhash_inode(dev_t dev); |
1da177e4 | 2420 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2421 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 LT |
2422 | extern void bd_set_size(struct block_device *, loff_t size); |
2423 | extern void bd_forget(struct inode *inode); | |
2424 | extern void bdput(struct block_device *); | |
585d3bc0 | 2425 | extern void invalidate_bdev(struct block_device *); |
5c0d6b60 | 2426 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
585d3bc0 | 2427 | extern int sync_blockdev(struct block_device *bdev); |
ff01bb48 | 2428 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2429 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2430 | extern void emergency_thaw_all(void); |
585d3bc0 NP |
2431 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2432 | extern int fsync_bdev(struct block_device *); | |
a212b105 TH |
2433 | |
2434 | extern struct super_block *blockdev_superblock; | |
2435 | ||
2436 | static inline bool sb_is_blkdev_sb(struct super_block *sb) | |
2437 | { | |
2438 | return sb == blockdev_superblock; | |
2439 | } | |
9361401e DH |
2440 | #else |
2441 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2442 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2443 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2444 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2445 | ||
2446 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2447 | { | |
2448 | return NULL; | |
2449 | } | |
2450 | ||
2451 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2452 | { | |
2453 | return 0; | |
2454 | } | |
5c0d6b60 JK |
2455 | |
2456 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) | |
2457 | { | |
2458 | } | |
a8855990 | 2459 | |
3e004eea | 2460 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a8855990 | 2461 | { |
3e004eea | 2462 | return false; |
a8855990 | 2463 | } |
9361401e | 2464 | #endif |
60b0680f | 2465 | extern int sync_filesystem(struct super_block *); |
9361401e | 2466 | extern const struct file_operations def_blk_fops; |
4b6f5d20 | 2467 | extern const struct file_operations def_chr_fops; |
9361401e | 2468 | #ifdef CONFIG_BLOCK |
1da177e4 | 2469 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2470 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2471 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2472 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2473 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2474 | void *holder); | |
2475 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2476 | void *holder); | |
4385bab1 | 2477 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
be324177 JW |
2478 | extern int __blkdev_reread_part(struct block_device *bdev); |
2479 | extern int blkdev_reread_part(struct block_device *bdev); | |
2480 | ||
641dc636 | 2481 | #ifdef CONFIG_SYSFS |
e09b457b | 2482 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2483 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2484 | struct gendisk *disk); | |
641dc636 | 2485 | #else |
e09b457b TH |
2486 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2487 | struct gendisk *disk) | |
2488 | { | |
2489 | return 0; | |
2490 | } | |
49731baa TH |
2491 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2492 | struct gendisk *disk) | |
2493 | { | |
2494 | } | |
641dc636 | 2495 | #endif |
9361401e | 2496 | #endif |
1da177e4 LT |
2497 | |
2498 | /* fs/char_dev.c */ | |
8a932f73 | 2499 | #define CHRDEV_MAJOR_MAX 512 |
49db08c3 LW |
2500 | /* Marks the bottom of the first segment of free char majors */ |
2501 | #define CHRDEV_MAJOR_DYN_END 234 | |
a5d31a3f LG |
2502 | /* Marks the top and bottom of the second segment of free char majors */ |
2503 | #define CHRDEV_MAJOR_DYN_EXT_START 511 | |
2504 | #define CHRDEV_MAJOR_DYN_EXT_END 384 | |
2505 | ||
1da177e4 LT |
2506 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2507 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2508 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2509 | unsigned int count, const char *name, | |
2510 | const struct file_operations *fops); | |
2511 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2512 | unsigned int count, const char *name); | |
1da177e4 | 2513 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2514 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2515 | |
1905b1bf TH |
2516 | static inline int register_chrdev(unsigned int major, const char *name, |
2517 | const struct file_operations *fops) | |
2518 | { | |
2519 | return __register_chrdev(major, 0, 256, name, fops); | |
2520 | } | |
2521 | ||
2522 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2523 | { | |
2524 | __unregister_chrdev(major, 0, 256, name); | |
2525 | } | |
2526 | ||
1da177e4 LT |
2527 | /* fs/block_dev.c */ |
2528 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2529 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2530 | |
2531 | #ifdef CONFIG_BLOCK | |
133d55cd | 2532 | #define BLKDEV_MAJOR_MAX 512 |
1da177e4 LT |
2533 | extern const char *__bdevname(dev_t, char *buffer); |
2534 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2535 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2536 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2537 | |
9361401e | 2538 | #else |
133d55cd | 2539 | #define BLKDEV_MAJOR_MAX 0 |
9361401e | 2540 | #endif |
1da177e4 LT |
2541 | |
2542 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2543 | ||
2544 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2545 | extern void make_bad_inode(struct inode *); | |
0e3ef1fe | 2546 | extern bool is_bad_inode(struct inode *); |
1da177e4 | 2547 | |
c11f0c0b | 2548 | #ifdef CONFIG_BLOCK |
c3279d14 AP |
2549 | extern void check_disk_size_change(struct gendisk *disk, |
2550 | struct block_device *bdev); | |
0c002c2f | 2551 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2552 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2553 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2554 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2555 | #endif |
1da177e4 LT |
2556 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2557 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2558 | |
1da177e4 LT |
2559 | static inline void invalidate_remote_inode(struct inode *inode) |
2560 | { | |
2561 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2562 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2563 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2564 | } |
2565 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2566 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2567 | pgoff_t start, pgoff_t end); | |
2568 | extern int write_inode_now(struct inode *, int); | |
2569 | extern int filemap_fdatawrite(struct address_space *); | |
2570 | extern int filemap_flush(struct address_space *); | |
76341cab | 2571 | extern int filemap_fdatawait_keep_errors(struct address_space *mapping); |
d3bccb6f JK |
2572 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2573 | loff_t lend); | |
ffb959bb JL |
2574 | |
2575 | static inline int filemap_fdatawait(struct address_space *mapping) | |
2576 | { | |
2577 | return filemap_fdatawait_range(mapping, 0, LLONG_MAX); | |
2578 | } | |
2579 | ||
7fc9e472 GR |
2580 | extern bool filemap_range_has_page(struct address_space *, loff_t lstart, |
2581 | loff_t lend); | |
a823e458 JL |
2582 | extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, |
2583 | loff_t lend); | |
1da177e4 LT |
2584 | extern int filemap_write_and_wait(struct address_space *mapping); |
2585 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2586 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2587 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2588 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2589 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2590 | loff_t start, loff_t end); | |
d72d9e2a | 2591 | extern int filemap_check_errors(struct address_space *mapping); |
5660e13d | 2592 | extern void __filemap_set_wb_err(struct address_space *mapping, int err); |
a823e458 JL |
2593 | |
2594 | extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, | |
2595 | loff_t lend); | |
5660e13d JL |
2596 | extern int __must_check file_check_and_advance_wb_err(struct file *file); |
2597 | extern int __must_check file_write_and_wait_range(struct file *file, | |
2598 | loff_t start, loff_t end); | |
2599 | ||
a823e458 JL |
2600 | static inline int file_write_and_wait(struct file *file) |
2601 | { | |
2602 | return file_write_and_wait_range(file, 0, LLONG_MAX); | |
2603 | } | |
2604 | ||
5660e13d JL |
2605 | /** |
2606 | * filemap_set_wb_err - set a writeback error on an address_space | |
2607 | * @mapping: mapping in which to set writeback error | |
2608 | * @err: error to be set in mapping | |
2609 | * | |
2610 | * When writeback fails in some way, we must record that error so that | |
2611 | * userspace can be informed when fsync and the like are called. We endeavor | |
2612 | * to report errors on any file that was open at the time of the error. Some | |
2613 | * internal callers also need to know when writeback errors have occurred. | |
2614 | * | |
2615 | * When a writeback error occurs, most filesystems will want to call | |
2616 | * filemap_set_wb_err to record the error in the mapping so that it will be | |
2617 | * automatically reported whenever fsync is called on the file. | |
5660e13d JL |
2618 | */ |
2619 | static inline void filemap_set_wb_err(struct address_space *mapping, int err) | |
2620 | { | |
2621 | /* Fastpath for common case of no error */ | |
2622 | if (unlikely(err)) | |
2623 | __filemap_set_wb_err(mapping, err); | |
2624 | } | |
2625 | ||
2626 | /** | |
2627 | * filemap_check_wb_error - has an error occurred since the mark was sampled? | |
2628 | * @mapping: mapping to check for writeback errors | |
2629 | * @since: previously-sampled errseq_t | |
2630 | * | |
2631 | * Grab the errseq_t value from the mapping, and see if it has changed "since" | |
2632 | * the given value was sampled. | |
2633 | * | |
2634 | * If it has then report the latest error set, otherwise return 0. | |
2635 | */ | |
2636 | static inline int filemap_check_wb_err(struct address_space *mapping, | |
2637 | errseq_t since) | |
2638 | { | |
2639 | return errseq_check(&mapping->wb_err, since); | |
2640 | } | |
2641 | ||
2642 | /** | |
2643 | * filemap_sample_wb_err - sample the current errseq_t to test for later errors | |
2644 | * @mapping: mapping to be sampled | |
2645 | * | |
2646 | * Writeback errors are always reported relative to a particular sample point | |
2647 | * in the past. This function provides those sample points. | |
2648 | */ | |
2649 | static inline errseq_t filemap_sample_wb_err(struct address_space *mapping) | |
2650 | { | |
2651 | return errseq_sample(&mapping->wb_err); | |
2652 | } | |
2653 | ||
8018ab05 CH |
2654 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2655 | int datasync); | |
2656 | extern int vfs_fsync(struct file *file, int datasync); | |
e2592217 CH |
2657 | |
2658 | /* | |
2659 | * Sync the bytes written if this was a synchronous write. Expect ki_pos | |
2660 | * to already be updated for the write, and will return either the amount | |
2661 | * of bytes passed in, or an error if syncing the file failed. | |
2662 | */ | |
2663 | static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) | |
2664 | { | |
2665 | if (iocb->ki_flags & IOCB_DSYNC) { | |
2666 | int ret = vfs_fsync_range(iocb->ki_filp, | |
2667 | iocb->ki_pos - count, iocb->ki_pos - 1, | |
2668 | (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); | |
2669 | if (ret) | |
2670 | return ret; | |
2671 | } | |
2672 | ||
2673 | return count; | |
d311d79d | 2674 | } |
e2592217 | 2675 | |
1da177e4 LT |
2676 | extern void emergency_sync(void); |
2677 | extern void emergency_remount(void); | |
9361401e | 2678 | #ifdef CONFIG_BLOCK |
1da177e4 | 2679 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2680 | #endif |
27ac0ffe | 2681 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
f419a2e3 | 2682 | extern int inode_permission(struct inode *, int); |
bd5d0856 | 2683 | extern int __inode_permission(struct inode *, int); |
2830ba7f | 2684 | extern int generic_permission(struct inode *, int); |
cbdf35bc | 2685 | extern int __check_sticky(struct inode *dir, struct inode *inode); |
1da177e4 | 2686 | |
f696a365 MS |
2687 | static inline bool execute_ok(struct inode *inode) |
2688 | { | |
2689 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2690 | } | |
2691 | ||
8d71db4f AV |
2692 | static inline void file_start_write(struct file *file) |
2693 | { | |
2694 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2695 | return; | |
2696 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); | |
2697 | } | |
2698 | ||
5ae98f15 JK |
2699 | static inline bool file_start_write_trylock(struct file *file) |
2700 | { | |
2701 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2702 | return true; | |
2703 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); | |
2704 | } | |
2705 | ||
8d71db4f AV |
2706 | static inline void file_end_write(struct file *file) |
2707 | { | |
2708 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2709 | return; | |
2710 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); | |
2711 | } | |
2712 | ||
bfe219d3 AG |
2713 | static inline int do_clone_file_range(struct file *file_in, loff_t pos_in, |
2714 | struct file *file_out, loff_t pos_out, | |
2715 | u64 len) | |
2716 | { | |
2717 | int ret; | |
2718 | ||
2719 | file_start_write(file_out); | |
2720 | ret = vfs_clone_file_range(file_in, pos_in, file_out, pos_out, len); | |
2721 | file_end_write(file_out); | |
2722 | ||
2723 | return ret; | |
2724 | } | |
2725 | ||
07b8ce1e AV |
2726 | /* |
2727 | * get_write_access() gets write permission for a file. | |
2728 | * put_write_access() releases this write permission. | |
2729 | * This is used for regular files. | |
2730 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2731 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2732 | * can have the following values: | |
2733 | * 0: no writers, no VM_DENYWRITE mappings | |
2734 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2735 | * > 0: (i_writecount) users are writing to the file. | |
2736 | * | |
2737 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2738 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2739 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2740 | * to do the change if sign is wrong. | |
2741 | */ | |
2742 | static inline int get_write_access(struct inode *inode) | |
2743 | { | |
2744 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2745 | } | |
2746 | static inline int deny_write_access(struct file *file) | |
2747 | { | |
496ad9aa | 2748 | struct inode *inode = file_inode(file); |
07b8ce1e AV |
2749 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2750 | } | |
1da177e4 LT |
2751 | static inline void put_write_access(struct inode * inode) |
2752 | { | |
2753 | atomic_dec(&inode->i_writecount); | |
2754 | } | |
2755 | static inline void allow_write_access(struct file *file) | |
2756 | { | |
2757 | if (file) | |
496ad9aa | 2758 | atomic_inc(&file_inode(file)->i_writecount); |
1da177e4 | 2759 | } |
f1fe29b4 DH |
2760 | static inline bool inode_is_open_for_write(const struct inode *inode) |
2761 | { | |
2762 | return atomic_read(&inode->i_writecount) > 0; | |
2763 | } | |
2764 | ||
a5c96ebf MZ |
2765 | #ifdef CONFIG_IMA |
2766 | static inline void i_readcount_dec(struct inode *inode) | |
2767 | { | |
2768 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2769 | atomic_dec(&inode->i_readcount); | |
2770 | } | |
2771 | static inline void i_readcount_inc(struct inode *inode) | |
2772 | { | |
2773 | atomic_inc(&inode->i_readcount); | |
2774 | } | |
2775 | #else | |
2776 | static inline void i_readcount_dec(struct inode *inode) | |
2777 | { | |
2778 | return; | |
2779 | } | |
2780 | static inline void i_readcount_inc(struct inode *inode) | |
2781 | { | |
2782 | return; | |
2783 | } | |
2784 | #endif | |
ed8cae8b | 2785 | extern int do_pipe_flags(int *, int); |
1da177e4 | 2786 | |
1284ab5b MZ |
2787 | #define __kernel_read_file_id(id) \ |
2788 | id(UNKNOWN, unknown) \ | |
2789 | id(FIRMWARE, firmware) \ | |
a098ecd2 | 2790 | id(FIRMWARE_PREALLOC_BUFFER, firmware) \ |
1284ab5b MZ |
2791 | id(MODULE, kernel-module) \ |
2792 | id(KEXEC_IMAGE, kexec-image) \ | |
2793 | id(KEXEC_INITRAMFS, kexec-initramfs) \ | |
2794 | id(POLICY, security-policy) \ | |
2795 | id(MAX_ID, ) | |
2796 | ||
2797 | #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, | |
2798 | #define __fid_stringify(dummy, str) #str, | |
2799 | ||
bc8ca5b9 | 2800 | enum kernel_read_file_id { |
1284ab5b MZ |
2801 | __kernel_read_file_id(__fid_enumify) |
2802 | }; | |
2803 | ||
2804 | static const char * const kernel_read_file_str[] = { | |
2805 | __kernel_read_file_id(__fid_stringify) | |
bc8ca5b9 MZ |
2806 | }; |
2807 | ||
da20dfe6 | 2808 | static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) |
1284ab5b | 2809 | { |
cbfd0c10 | 2810 | if ((unsigned)id >= READING_MAX_ID) |
1284ab5b MZ |
2811 | return kernel_read_file_str[READING_UNKNOWN]; |
2812 | ||
2813 | return kernel_read_file_str[id]; | |
2814 | } | |
2815 | ||
bc8ca5b9 MZ |
2816 | extern int kernel_read_file(struct file *, void **, loff_t *, loff_t, |
2817 | enum kernel_read_file_id); | |
711aab1d | 2818 | extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t, |
09596b94 | 2819 | enum kernel_read_file_id); |
b844f0ec MZ |
2820 | extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t, |
2821 | enum kernel_read_file_id); | |
bdd1d2d3 | 2822 | extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *); |
e13ec939 | 2823 | extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *); |
73e18f7c | 2824 | extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *); |
1da177e4 LT |
2825 | extern struct file * open_exec(const char *); |
2826 | ||
2827 | /* fs/dcache.c -- generic fs support functions */ | |
a6e5787f | 2828 | extern bool is_subdir(struct dentry *, struct dentry *); |
640eb7e7 | 2829 | extern bool path_is_under(const struct path *, const struct path *); |
1da177e4 | 2830 | |
9bf39ab2 MS |
2831 | extern char *file_path(struct file *, char *, int); |
2832 | ||
1da177e4 LT |
2833 | #include <linux/err.h> |
2834 | ||
2835 | /* needed for stackable file system support */ | |
965c8e59 | 2836 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2837 | |
965c8e59 | 2838 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2839 | |
54e34621 | 2840 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2841 | extern void inode_init_once(struct inode *); |
2aa15890 | 2842 | extern void address_space_init_once(struct address_space *mapping); |
1da177e4 LT |
2843 | extern struct inode * igrab(struct inode *); |
2844 | extern ino_t iunique(struct super_block *, ino_t); | |
2845 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2846 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2847 | static inline int generic_drop_inode(struct inode *inode) |
2848 | { | |
2849 | return !inode->i_nlink || inode_unhashed(inode); | |
2850 | } | |
1da177e4 | 2851 | |
88bd5121 AA |
2852 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2853 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2854 | void *data); | |
1da177e4 LT |
2855 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2856 | int (*test)(struct inode *, void *), void *data); | |
2857 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2858 | ||
2859 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); | |
2860 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
fe032c42 TT |
2861 | extern struct inode *find_inode_nowait(struct super_block *, |
2862 | unsigned long, | |
2863 | int (*match)(struct inode *, | |
2864 | unsigned long, void *), | |
2865 | void *data); | |
261bca86 AV |
2866 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
2867 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
2868 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
2869 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
2870 | #else | |
2871 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
2872 | #endif | |
1da177e4 | 2873 | extern void unlock_new_inode(struct inode *); |
85fe4025 | 2874 | extern unsigned int get_next_ino(void); |
799ea9e9 | 2875 | extern void evict_inodes(struct super_block *sb); |
1da177e4 | 2876 | |
1da177e4 | 2877 | extern void __iget(struct inode * inode); |
b46980fe | 2878 | extern void iget_failed(struct inode *); |
dbd5768f | 2879 | extern void clear_inode(struct inode *); |
2e00c97e | 2880 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
2881 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
2882 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 2883 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 2884 | extern int should_remove_suid(struct dentry *); |
5fa8e0a1 | 2885 | extern int file_remove_privs(struct file *); |
1da177e4 LT |
2886 | |
2887 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
2888 | static inline void insert_inode_hash(struct inode *inode) |
2889 | { | |
1da177e4 LT |
2890 | __insert_inode_hash(inode, inode->i_ino); |
2891 | } | |
f2ee7abf ED |
2892 | |
2893 | extern void __remove_inode_hash(struct inode *); | |
2894 | static inline void remove_inode_hash(struct inode *inode) | |
2895 | { | |
cbedaac6 | 2896 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
f2ee7abf ED |
2897 | __remove_inode_hash(inode); |
2898 | } | |
2899 | ||
646ec461 | 2900 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 2901 | |
9361401e | 2902 | #ifdef CONFIG_BLOCK |
1da177e4 | 2903 | extern int bdev_read_only(struct block_device *); |
9361401e | 2904 | #endif |
1da177e4 LT |
2905 | extern int set_blocksize(struct block_device *, int); |
2906 | extern int sb_set_blocksize(struct super_block *, int); | |
2907 | extern int sb_min_blocksize(struct super_block *, int); | |
2908 | ||
2909 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
2910 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
3309dd04 | 2911 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
ed978a81 | 2912 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2913 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
8174202b | 2914 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
1af5bb49 | 2915 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *); |
3b93f911 | 2916 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
88e6faef | 2917 | |
18e9710e | 2918 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, |
ddef7ed2 | 2919 | rwf_t flags); |
abbb6589 | 2920 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, |
ddef7ed2 | 2921 | rwf_t flags); |
dbe4e192 | 2922 | |
eef99380 | 2923 | /* fs/block_dev.c */ |
b2de525f | 2924 | extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
1456c0a8 | 2925 | extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
02c24a82 JB |
2926 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
2927 | int datasync); | |
ff01bb48 | 2928 | extern void block_sync_page(struct page *page); |
eef99380 | 2929 | |
88e6faef | 2930 | /* fs/splice.c */ |
cbb7e577 | 2931 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 2932 | struct pipe_inode_info *, size_t, unsigned int); |
8d020765 | 2933 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 2934 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 2935 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 | 2936 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1c118596 MS |
2937 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
2938 | loff_t *opos, size_t len, unsigned int flags); | |
2939 | ||
88e6faef | 2940 | |
1da177e4 LT |
2941 | extern void |
2942 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
965c8e59 AM |
2943 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
2944 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); | |
46a1c2c7 | 2945 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
965c8e59 | 2946 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
5760495a | 2947 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
965c8e59 | 2948 | int whence, loff_t maxsize, loff_t eof); |
1bf9d14d AV |
2949 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
2950 | int whence, loff_t size); | |
b25472f9 AV |
2951 | extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t); |
2952 | extern loff_t no_seek_end_llseek(struct file *, loff_t, int); | |
1da177e4 LT |
2953 | extern int generic_file_open(struct inode * inode, struct file * filp); |
2954 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
2955 | ||
9361401e | 2956 | #ifdef CONFIG_BLOCK |
8a4c1e42 | 2957 | typedef void (dio_submit_t)(struct bio *bio, struct inode *inode, |
facd07b0 | 2958 | loff_t file_offset); |
1da177e4 LT |
2959 | |
2960 | enum { | |
1e431f5c CH |
2961 | /* need locking between buffered and direct access */ |
2962 | DIO_LOCKING = 0x01, | |
2963 | ||
2964 | /* filesystem does not support filling holes */ | |
2965 | DIO_SKIP_HOLES = 0x02, | |
60392573 CH |
2966 | |
2967 | /* filesystem can handle aio writes beyond i_size */ | |
2968 | DIO_ASYNC_EXTEND = 0x04, | |
fe0f07d0 JA |
2969 | |
2970 | /* inode/fs/bdev does not need truncate protection */ | |
2971 | DIO_SKIP_DIO_COUNT = 0x08, | |
1da177e4 LT |
2972 | }; |
2973 | ||
4055351c | 2974 | void dio_end_io(struct bio *bio); |
eafdc7d1 | 2975 | |
17f8c842 OS |
2976 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
2977 | struct block_device *bdev, struct iov_iter *iter, | |
c8b8e32d | 2978 | get_block_t get_block, |
17f8c842 OS |
2979 | dio_iodone_t end_io, dio_submit_t submit_io, |
2980 | int flags); | |
7bb46a67 | 2981 | |
17f8c842 OS |
2982 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
2983 | struct inode *inode, | |
c8b8e32d | 2984 | struct iov_iter *iter, |
17f8c842 | 2985 | get_block_t get_block) |
1da177e4 | 2986 | { |
17f8c842 | 2987 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 2988 | get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 2989 | } |
9361401e | 2990 | #endif |
1da177e4 | 2991 | |
1d59d61f | 2992 | void inode_dio_wait(struct inode *inode); |
fe0f07d0 JA |
2993 | |
2994 | /* | |
2995 | * inode_dio_begin - signal start of a direct I/O requests | |
2996 | * @inode: inode the direct I/O happens on | |
2997 | * | |
2998 | * This is called once we've finished processing a direct I/O request, | |
2999 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
3000 | */ | |
3001 | static inline void inode_dio_begin(struct inode *inode) | |
3002 | { | |
3003 | atomic_inc(&inode->i_dio_count); | |
3004 | } | |
3005 | ||
3006 | /* | |
3007 | * inode_dio_end - signal finish of a direct I/O requests | |
3008 | * @inode: inode the direct I/O happens on | |
3009 | * | |
3010 | * This is called once we've finished processing a direct I/O request, | |
3011 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
3012 | */ | |
3013 | static inline void inode_dio_end(struct inode *inode) | |
3014 | { | |
3015 | if (atomic_dec_and_test(&inode->i_dio_count)) | |
3016 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); | |
3017 | } | |
1d59d61f | 3018 | |
5f16f322 TT |
3019 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
3020 | unsigned int mask); | |
3021 | ||
4b6f5d20 | 3022 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
3023 | |
3024 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
3025 | ||
5d826c84 | 3026 | extern int readlink_copy(char __user *, int, const char *); |
1da177e4 | 3027 | extern int page_readlink(struct dentry *, char __user *, int); |
fceef393 AV |
3028 | extern const char *page_get_link(struct dentry *, struct inode *, |
3029 | struct delayed_call *); | |
3030 | extern void page_put_link(void *); | |
0adb25d2 | 3031 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 3032 | int nofs); |
1da177e4 | 3033 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 3034 | extern const struct inode_operations page_symlink_inode_operations; |
fceef393 | 3035 | extern void kfree_link(void *); |
1da177e4 | 3036 | extern void generic_fillattr(struct inode *, struct kstat *); |
a528d35e DH |
3037 | extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int); |
3038 | extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int); | |
b462707e | 3039 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 3040 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
1c8924eb | 3041 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 3042 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
f4a8116a JK |
3043 | static inline loff_t __inode_get_bytes(struct inode *inode) |
3044 | { | |
3045 | return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; | |
3046 | } | |
1da177e4 LT |
3047 | loff_t inode_get_bytes(struct inode *inode); |
3048 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
fceef393 AV |
3049 | const char *simple_get_link(struct dentry *, struct inode *, |
3050 | struct delayed_call *); | |
61ba64fc | 3051 | extern const struct inode_operations simple_symlink_inode_operations; |
1da177e4 | 3052 | |
5c0ba4e0 | 3053 | extern int iterate_dir(struct file *, struct dir_context *); |
1da177e4 | 3054 | |
a528d35e DH |
3055 | extern int vfs_statx(int, const char __user *, int, struct kstat *, u32); |
3056 | extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int); | |
3057 | ||
3058 | static inline int vfs_stat(const char __user *filename, struct kstat *stat) | |
3059 | { | |
deccf497 DH |
3060 | return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT, |
3061 | stat, STATX_BASIC_STATS); | |
a528d35e DH |
3062 | } |
3063 | static inline int vfs_lstat(const char __user *name, struct kstat *stat) | |
3064 | { | |
deccf497 | 3065 | return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT, |
a528d35e DH |
3066 | stat, STATX_BASIC_STATS); |
3067 | } | |
3068 | static inline int vfs_fstatat(int dfd, const char __user *filename, | |
3069 | struct kstat *stat, int flags) | |
3070 | { | |
42f46148 | 3071 | return vfs_statx(dfd, filename, flags, stat, STATX_BASIC_STATS); |
a528d35e DH |
3072 | } |
3073 | static inline int vfs_fstat(int fd, struct kstat *stat) | |
3074 | { | |
3075 | return vfs_statx_fd(fd, stat, STATX_BASIC_STATS, 0); | |
3076 | } | |
3077 | ||
3078 | ||
d60874cd | 3079 | extern const char *vfs_get_link(struct dentry *, struct delayed_call *); |
fd4a0edf | 3080 | extern int vfs_readlink(struct dentry *, char __user *, int); |
1da177e4 | 3081 | |
e9079cce | 3082 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
3083 | struct fiemap_extent_info *fieinfo, |
3084 | loff_t start, loff_t len, | |
3085 | get_block_t *get_block); | |
68c9d702 JB |
3086 | extern int generic_block_fiemap(struct inode *inode, |
3087 | struct fiemap_extent_info *fieinfo, u64 start, | |
3088 | u64 len, get_block_t *get_block); | |
1da177e4 | 3089 | |
ee416bcd | 3090 | extern struct file_system_type *get_filesystem(struct file_system_type *fs); |
c18479fe | 3091 | extern void put_filesystem(struct file_system_type *fs); |
1da177e4 LT |
3092 | extern struct file_system_type *get_fs_type(const char *name); |
3093 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 3094 | extern struct super_block *get_super_thawed(struct block_device *); |
ba6379f7 | 3095 | extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev); |
4504230a | 3096 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 3097 | extern void drop_super(struct super_block *sb); |
ba6379f7 | 3098 | extern void drop_super_exclusive(struct super_block *sb); |
01a05b33 | 3099 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
3100 | extern void iterate_supers_type(struct file_system_type *, |
3101 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
3102 | |
3103 | extern int dcache_dir_open(struct inode *, struct file *); | |
3104 | extern int dcache_dir_close(struct inode *, struct file *); | |
3105 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
5f99f4e7 | 3106 | extern int dcache_readdir(struct file *, struct dir_context *); |
7bb46a67 | 3107 | extern int simple_setattr(struct dentry *, struct iattr *); |
a528d35e | 3108 | extern int simple_getattr(const struct path *, struct kstat *, u32, unsigned int); |
726c3342 | 3109 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
20955e89 | 3110 | extern int simple_open(struct inode *inode, struct file *file); |
1da177e4 LT |
3111 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
3112 | extern int simple_unlink(struct inode *, struct dentry *); | |
3113 | extern int simple_rmdir(struct inode *, struct dentry *); | |
e0e0be8a MS |
3114 | extern int simple_rename(struct inode *, struct dentry *, |
3115 | struct inode *, struct dentry *, unsigned int); | |
02c24a82 | 3116 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
3117 | extern int simple_empty(struct dentry *); |
3118 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
3119 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
3120 | loff_t pos, unsigned len, unsigned flags, | |
3121 | struct page **pagep, void **fsdata); | |
3122 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
3123 | loff_t pos, unsigned len, unsigned copied, | |
3124 | struct page *page, void *fsdata); | |
b26d4cd3 | 3125 | extern int always_delete_dentry(const struct dentry *); |
6987843f | 3126 | extern struct inode *alloc_anon_inode(struct super_block *); |
e6f5c789 | 3127 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
b26d4cd3 | 3128 | extern const struct dentry_operations simple_dentry_operations; |
1da177e4 | 3129 | |
00cd8dd3 | 3130 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
1da177e4 | 3131 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
4b6f5d20 | 3132 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 3133 | extern const struct inode_operations simple_dir_inode_operations; |
fbabfd0f EB |
3134 | extern void make_empty_dir_inode(struct inode *inode); |
3135 | extern bool is_empty_dir_inode(struct inode *inode); | |
cda37124 | 3136 | struct tree_descr { const char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 3137 | struct dentry *d_alloc_name(struct dentry *, const char *); |
cda37124 EB |
3138 | extern int simple_fill_super(struct super_block *, unsigned long, |
3139 | const struct tree_descr *); | |
1f5ce9e9 | 3140 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
3141 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
3142 | ||
93b07113 AM |
3143 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
3144 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
3145 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
3146 | const void __user *from, size_t count); | |
1da177e4 | 3147 | |
ac13a829 | 3148 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
02c24a82 | 3149 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 3150 | |
30ca22c7 PL |
3151 | extern int generic_check_addressable(unsigned, u64); |
3152 | ||
e965f963 | 3153 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 3154 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
3155 | struct page *, struct page *, |
3156 | enum migrate_mode); | |
e965f963 CL |
3157 | #else |
3158 | #define buffer_migrate_page NULL | |
3159 | #endif | |
3160 | ||
31051c85 | 3161 | extern int setattr_prepare(struct dentry *, struct iattr *); |
25d9e2d1 | 3162 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
6a1a90ad | 3163 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 3164 | |
c3b2da31 | 3165 | extern int file_update_time(struct file *file); |
1da177e4 | 3166 | |
d475c634 MW |
3167 | static inline bool io_is_direct(struct file *filp) |
3168 | { | |
65f87ee7 | 3169 | return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host); |
d475c634 MW |
3170 | } |
3171 | ||
baabda26 DW |
3172 | static inline bool vma_is_dax(struct vm_area_struct *vma) |
3173 | { | |
3174 | return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); | |
3175 | } | |
3176 | ||
2ba48ce5 AV |
3177 | static inline int iocb_flags(struct file *file) |
3178 | { | |
3179 | int res = 0; | |
3180 | if (file->f_flags & O_APPEND) | |
3181 | res |= IOCB_APPEND; | |
3182 | if (io_is_direct(file)) | |
3183 | res |= IOCB_DIRECT; | |
dde0c2e7 CH |
3184 | if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) |
3185 | res |= IOCB_DSYNC; | |
3186 | if (file->f_flags & __O_SYNC) | |
3187 | res |= IOCB_SYNC; | |
2ba48ce5 AV |
3188 | return res; |
3189 | } | |
3190 | ||
ddef7ed2 | 3191 | static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) |
fdd2f5b7 GR |
3192 | { |
3193 | if (unlikely(flags & ~RWF_SUPPORTED)) | |
3194 | return -EOPNOTSUPP; | |
3195 | ||
b745fafa | 3196 | if (flags & RWF_NOWAIT) { |
91f9943e | 3197 | if (!(ki->ki_filp->f_mode & FMODE_NOWAIT)) |
b745fafa GR |
3198 | return -EOPNOTSUPP; |
3199 | ki->ki_flags |= IOCB_NOWAIT; | |
3200 | } | |
fdd2f5b7 GR |
3201 | if (flags & RWF_HIPRI) |
3202 | ki->ki_flags |= IOCB_HIPRI; | |
3203 | if (flags & RWF_DSYNC) | |
3204 | ki->ki_flags |= IOCB_DSYNC; | |
3205 | if (flags & RWF_SYNC) | |
3206 | ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC); | |
3207 | return 0; | |
3208 | } | |
3209 | ||
1da177e4 LT |
3210 | static inline ino_t parent_ino(struct dentry *dentry) |
3211 | { | |
3212 | ino_t res; | |
3213 | ||
b5c84bf6 NP |
3214 | /* |
3215 | * Don't strictly need d_lock here? If the parent ino could change | |
3216 | * then surely we'd have a deeper race in the caller? | |
3217 | */ | |
1da177e4 LT |
3218 | spin_lock(&dentry->d_lock); |
3219 | res = dentry->d_parent->d_inode->i_ino; | |
3220 | spin_unlock(&dentry->d_lock); | |
3221 | return res; | |
3222 | } | |
3223 | ||
1da177e4 LT |
3224 | /* Transaction based IO helpers */ |
3225 | ||
3226 | /* | |
3227 | * An argresp is stored in an allocated page and holds the | |
3228 | * size of the argument or response, along with its content | |
3229 | */ | |
3230 | struct simple_transaction_argresp { | |
3231 | ssize_t size; | |
3232 | char data[0]; | |
3233 | }; | |
3234 | ||
3235 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
3236 | ||
3237 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
3238 | size_t size); | |
3239 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
3240 | size_t size, loff_t *pos); | |
3241 | int simple_transaction_release(struct inode *inode, struct file *file); | |
3242 | ||
76791ab2 | 3243 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 3244 | |
acaefc25 AB |
3245 | /* |
3246 | * simple attribute files | |
3247 | * | |
3248 | * These attributes behave similar to those in sysfs: | |
3249 | * | |
3250 | * Writing to an attribute immediately sets a value, an open file can be | |
3251 | * written to multiple times. | |
3252 | * | |
3253 | * Reading from an attribute creates a buffer from the value that might get | |
3254 | * read with multiple read calls. When the attribute has been read | |
3255 | * completely, no further read calls are possible until the file is opened | |
3256 | * again. | |
3257 | * | |
3258 | * All attributes contain a text representation of a numeric value | |
3259 | * that are accessed with the get() and set() functions. | |
3260 | */ | |
3261 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
3262 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
3263 | { \ | |
3264 | __simple_attr_check_format(__fmt, 0ull); \ | |
3265 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
3266 | } \ | |
828c0950 | 3267 | static const struct file_operations __fops = { \ |
acaefc25 AB |
3268 | .owner = THIS_MODULE, \ |
3269 | .open = __fops ## _open, \ | |
74bedc4d | 3270 | .release = simple_attr_release, \ |
acaefc25 AB |
3271 | .read = simple_attr_read, \ |
3272 | .write = simple_attr_write, \ | |
1ec5584e | 3273 | .llseek = generic_file_llseek, \ |
68be3029 | 3274 | } |
acaefc25 | 3275 | |
b9075fa9 JP |
3276 | static inline __printf(1, 2) |
3277 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
3278 | { |
3279 | /* don't do anything, just let the compiler check the arguments; */ | |
3280 | } | |
3281 | ||
3282 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 3283 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 3284 | const char *fmt); |
74bedc4d | 3285 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
3286 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
3287 | size_t len, loff_t *ppos); | |
3288 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
3289 | size_t len, loff_t *ppos); | |
3290 | ||
4be28540 | 3291 | struct ctl_table; |
8d65af78 | 3292 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 3293 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
3294 | int proc_nr_dentry(struct ctl_table *table, int write, |
3295 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
3296 | int proc_nr_inodes(struct ctl_table *table, int write, |
3297 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 3298 | int __init get_filesystem_list(char *buf); |
62239ac2 | 3299 | |
3cd90ea4 | 3300 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
3301 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
3302 | ||
6d125529 | 3303 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 3304 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 3305 | (flag & __FMODE_NONOTIFY))) |
5300990c | 3306 | |
d37177ba | 3307 | static inline bool is_sxid(umode_t mode) |
69b45732 AK |
3308 | { |
3309 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
3310 | } | |
3311 | ||
cbdf35bc MS |
3312 | static inline int check_sticky(struct inode *dir, struct inode *inode) |
3313 | { | |
3314 | if (!(dir->i_mode & S_ISVTX)) | |
3315 | return 0; | |
3316 | ||
3317 | return __check_sticky(dir, inode); | |
3318 | } | |
3319 | ||
69b45732 AK |
3320 | static inline void inode_has_no_xattr(struct inode *inode) |
3321 | { | |
e462ec50 | 3322 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC)) |
69b45732 AK |
3323 | inode->i_flags |= S_NOSEC; |
3324 | } | |
3325 | ||
a7400222 AV |
3326 | static inline bool is_root_inode(struct inode *inode) |
3327 | { | |
3328 | return inode == inode->i_sb->s_root->d_inode; | |
3329 | } | |
3330 | ||
5f99f4e7 AV |
3331 | static inline bool dir_emit(struct dir_context *ctx, |
3332 | const char *name, int namelen, | |
3333 | u64 ino, unsigned type) | |
3334 | { | |
3335 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; | |
3336 | } | |
3337 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) | |
3338 | { | |
3339 | return ctx->actor(ctx, ".", 1, ctx->pos, | |
3340 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; | |
3341 | } | |
3342 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) | |
3343 | { | |
3344 | return ctx->actor(ctx, "..", 2, ctx->pos, | |
3345 | parent_ino(file->f_path.dentry), DT_DIR) == 0; | |
3346 | } | |
3347 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) | |
3348 | { | |
3349 | if (ctx->pos == 0) { | |
3350 | if (!dir_emit_dot(file, ctx)) | |
3351 | return false; | |
3352 | ctx->pos = 1; | |
3353 | } | |
3354 | if (ctx->pos == 1) { | |
3355 | if (!dir_emit_dotdot(file, ctx)) | |
3356 | return false; | |
3357 | ctx->pos = 2; | |
3358 | } | |
3359 | return true; | |
3360 | } | |
5ded75ec AV |
3361 | static inline bool dir_relax(struct inode *inode) |
3362 | { | |
5955102c AV |
3363 | inode_unlock(inode); |
3364 | inode_lock(inode); | |
5ded75ec AV |
3365 | return !IS_DEADDIR(inode); |
3366 | } | |
5f99f4e7 | 3367 | |
ae05327a AV |
3368 | static inline bool dir_relax_shared(struct inode *inode) |
3369 | { | |
3370 | inode_unlock_shared(inode); | |
3371 | inode_lock_shared(inode); | |
3372 | return !IS_DEADDIR(inode); | |
3373 | } | |
3374 | ||
90f8572b | 3375 | extern bool path_noexec(const struct path *path); |
21fc61c7 | 3376 | extern void inode_nohighmem(struct inode *inode); |
90f8572b | 3377 | |
1da177e4 | 3378 | #endif /* _LINUX_FS_H */ |