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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_FS_H |
3 | #define _LINUX_FS_H | |
4 | ||
1da177e4 | 5 | #include <linux/linkage.h> |
5dd43ce2 | 6 | #include <linux/wait_bit.h> |
1da177e4 LT |
7 | #include <linux/kdev_t.h> |
8 | #include <linux/dcache.h> | |
3f8206d4 | 9 | #include <linux/path.h> |
1da177e4 LT |
10 | #include <linux/stat.h> |
11 | #include <linux/cache.h> | |
1da177e4 | 12 | #include <linux/list.h> |
bc3b14cb | 13 | #include <linux/list_lru.h> |
4f5e65a1 | 14 | #include <linux/llist.h> |
1da177e4 | 15 | #include <linux/radix-tree.h> |
b93b0163 | 16 | #include <linux/xarray.h> |
6b2dbba8 | 17 | #include <linux/rbtree.h> |
1da177e4 | 18 | #include <linux/init.h> |
914e2637 | 19 | #include <linux/pid.h> |
187f1882 | 20 | #include <linux/bug.h> |
1b1dcc1b | 21 | #include <linux/mutex.h> |
c8c06efa | 22 | #include <linux/rwsem.h> |
baabda26 | 23 | #include <linux/mm_types.h> |
3bd858ab | 24 | #include <linux/capability.h> |
6188e10d | 25 | #include <linux/semaphore.h> |
c75b1d94 | 26 | #include <linux/fcntl.h> |
c4b929b8 | 27 | #include <linux/fiemap.h> |
ceb5bdc2 | 28 | #include <linux/rculist_bl.h> |
07b8ce1e | 29 | #include <linux/atomic.h> |
83aeeada | 30 | #include <linux/shrinker.h> |
c1aab02d | 31 | #include <linux/migrate_mode.h> |
92361636 | 32 | #include <linux/uidgid.h> |
5accdf82 | 33 | #include <linux/lockdep.h> |
c2b1ad80 | 34 | #include <linux/percpu-rwsem.h> |
853b39a7 | 35 | #include <linux/workqueue.h> |
fceef393 | 36 | #include <linux/delayed_call.h> |
85787090 | 37 | #include <linux/uuid.h> |
5660e13d | 38 | #include <linux/errseq.h> |
d9a08a9e | 39 | #include <linux/ioprio.h> |
bbe7449e | 40 | #include <linux/fs_types.h> |
f1fffbd4 RV |
41 | #include <linux/build_bug.h> |
42 | #include <linux/stddef.h> | |
1da177e4 | 43 | |
1da177e4 | 44 | #include <asm/byteorder.h> |
607ca46e | 45 | #include <uapi/linux/fs.h> |
1da177e4 | 46 | |
b83ae6d4 | 47 | struct backing_dev_info; |
52ebea74 | 48 | struct bdi_writeback; |
2f8b5444 | 49 | struct bio; |
a5694255 | 50 | struct export_operations; |
a885c8c4 | 51 | struct hd_geometry; |
1da177e4 | 52 | struct iovec; |
92198f7e | 53 | struct kiocb; |
57cc7215 | 54 | struct kobject; |
1da177e4 LT |
55 | struct pipe_inode_info; |
56 | struct poll_table_struct; | |
57 | struct kstatfs; | |
58 | struct vm_area_struct; | |
59 | struct vfsmount; | |
745ca247 | 60 | struct cred; |
a509bc1a | 61 | struct swap_info_struct; |
55985dd7 | 62 | struct seq_file; |
7b7a8665 | 63 | struct workqueue_struct; |
3b93f911 | 64 | struct iov_iter; |
0b81d077 JK |
65 | struct fscrypt_info; |
66 | struct fscrypt_operations; | |
f3a09c92 | 67 | struct fs_context; |
3e1aeb00 | 68 | struct fs_parameter_description; |
1da177e4 | 69 | |
74bf17cf | 70 | extern void __init inode_init(void); |
1da177e4 | 71 | extern void __init inode_init_early(void); |
4248b0da MG |
72 | extern void __init files_init(void); |
73 | extern void __init files_maxfiles_init(void); | |
1da177e4 | 74 | |
dded4f4d | 75 | extern struct files_stat_struct files_stat; |
518de9b3 | 76 | extern unsigned long get_max_files(void); |
9b80a184 | 77 | extern unsigned int sysctl_nr_open; |
dded4f4d JE |
78 | extern struct inodes_stat_t inodes_stat; |
79 | extern int leases_enable, lease_break_time; | |
800179c9 KC |
80 | extern int sysctl_protected_symlinks; |
81 | extern int sysctl_protected_hardlinks; | |
30aba665 SM |
82 | extern int sysctl_protected_fifos; |
83 | extern int sysctl_protected_regular; | |
dded4f4d | 84 | |
ddef7ed2 CH |
85 | typedef __kernel_rwf_t rwf_t; |
86 | ||
1da177e4 LT |
87 | struct buffer_head; |
88 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, | |
89 | struct buffer_head *bh_result, int create); | |
187372a3 | 90 | typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
7b7a8665 | 91 | ssize_t bytes, void *private); |
1da177e4 | 92 | |
bbc1096a DH |
93 | #define MAY_EXEC 0x00000001 |
94 | #define MAY_WRITE 0x00000002 | |
95 | #define MAY_READ 0x00000004 | |
96 | #define MAY_APPEND 0x00000008 | |
97 | #define MAY_ACCESS 0x00000010 | |
98 | #define MAY_OPEN 0x00000020 | |
99 | #define MAY_CHDIR 0x00000040 | |
100 | /* called from RCU mode, don't block */ | |
101 | #define MAY_NOT_BLOCK 0x00000080 | |
102 | ||
103 | /* | |
104 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond | |
75abe329 | 105 | * to O_WRONLY and O_RDWR via the strange trick in do_dentry_open() |
bbc1096a DH |
106 | */ |
107 | ||
108 | /* file is open for reading */ | |
109 | #define FMODE_READ ((__force fmode_t)0x1) | |
110 | /* file is open for writing */ | |
111 | #define FMODE_WRITE ((__force fmode_t)0x2) | |
112 | /* file is seekable */ | |
113 | #define FMODE_LSEEK ((__force fmode_t)0x4) | |
114 | /* file can be accessed using pread */ | |
115 | #define FMODE_PREAD ((__force fmode_t)0x8) | |
116 | /* file can be accessed using pwrite */ | |
117 | #define FMODE_PWRITE ((__force fmode_t)0x10) | |
118 | /* File is opened for execution with sys_execve / sys_uselib */ | |
119 | #define FMODE_EXEC ((__force fmode_t)0x20) | |
120 | /* File is opened with O_NDELAY (only set for block devices) */ | |
121 | #define FMODE_NDELAY ((__force fmode_t)0x40) | |
122 | /* File is opened with O_EXCL (only set for block devices) */ | |
123 | #define FMODE_EXCL ((__force fmode_t)0x80) | |
124 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls | |
125 | (specialy hack for floppy.c) */ | |
126 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) | |
127 | /* 32bit hashes as llseek() offset (for directories) */ | |
128 | #define FMODE_32BITHASH ((__force fmode_t)0x200) | |
129 | /* 64bit hashes as llseek() offset (for directories) */ | |
130 | #define FMODE_64BITHASH ((__force fmode_t)0x400) | |
131 | ||
132 | /* | |
133 | * Don't update ctime and mtime. | |
134 | * | |
135 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll | |
136 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. | |
137 | */ | |
138 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) | |
139 | ||
140 | /* Expect random access pattern */ | |
141 | #define FMODE_RANDOM ((__force fmode_t)0x1000) | |
142 | ||
143 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ | |
144 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) | |
145 | ||
146 | /* File is opened with O_PATH; almost nothing can be done with it */ | |
147 | #define FMODE_PATH ((__force fmode_t)0x4000) | |
148 | ||
9c225f26 LT |
149 | /* File needs atomic accesses to f_pos */ |
150 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) | |
83f936c7 AV |
151 | /* Write access to underlying fs */ |
152 | #define FMODE_WRITER ((__force fmode_t)0x10000) | |
7f7f25e8 AV |
153 | /* Has read method(s) */ |
154 | #define FMODE_CAN_READ ((__force fmode_t)0x20000) | |
155 | /* Has write method(s) */ | |
156 | #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) | |
9c225f26 | 157 | |
f5d11409 | 158 | #define FMODE_OPENED ((__force fmode_t)0x80000) |
73a09dd9 | 159 | #define FMODE_CREATED ((__force fmode_t)0x100000) |
f5d11409 | 160 | |
10dce8af KS |
161 | /* File is stream-like */ |
162 | #define FMODE_STREAM ((__force fmode_t)0x200000) | |
163 | ||
bbc1096a | 164 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
75069f2b | 165 | #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
bbc1096a | 166 | |
91f9943e | 167 | /* File is capable of returning -EAGAIN if I/O will block */ |
a07b2000 AV |
168 | #define FMODE_NOWAIT ((__force fmode_t)0x8000000) |
169 | ||
170 | /* File represents mount that needs unmounting */ | |
171 | #define FMODE_NEED_UNMOUNT ((__force fmode_t)0x10000000) | |
b745fafa | 172 | |
d3b1084d | 173 | /* File does not contribute to nr_files count */ |
a07b2000 | 174 | #define FMODE_NOACCOUNT ((__force fmode_t)0x20000000) |
d3b1084d | 175 | |
bbc1096a DH |
176 | /* |
177 | * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector | |
178 | * that indicates that they should check the contents of the iovec are | |
179 | * valid, but not check the memory that the iovec elements | |
180 | * points too. | |
181 | */ | |
182 | #define CHECK_IOVEC_ONLY -1 | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * Attribute flags. These should be or-ed together to figure out what | |
186 | * has been changed! | |
187 | */ | |
9767d749 MS |
188 | #define ATTR_MODE (1 << 0) |
189 | #define ATTR_UID (1 << 1) | |
190 | #define ATTR_GID (1 << 2) | |
191 | #define ATTR_SIZE (1 << 3) | |
192 | #define ATTR_ATIME (1 << 4) | |
193 | #define ATTR_MTIME (1 << 5) | |
194 | #define ATTR_CTIME (1 << 6) | |
195 | #define ATTR_ATIME_SET (1 << 7) | |
196 | #define ATTR_MTIME_SET (1 << 8) | |
197 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ | |
9767d749 MS |
198 | #define ATTR_KILL_SUID (1 << 11) |
199 | #define ATTR_KILL_SGID (1 << 12) | |
200 | #define ATTR_FILE (1 << 13) | |
201 | #define ATTR_KILL_PRIV (1 << 14) | |
202 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ | |
203 | #define ATTR_TIMES_SET (1 << 16) | |
f2b20f6e | 204 | #define ATTR_TOUCH (1 << 17) |
1da177e4 | 205 | |
787fb6bc MS |
206 | /* |
207 | * Whiteout is represented by a char device. The following constants define the | |
208 | * mode and device number to use. | |
209 | */ | |
210 | #define WHITEOUT_MODE 0 | |
211 | #define WHITEOUT_DEV 0 | |
212 | ||
1da177e4 LT |
213 | /* |
214 | * This is the Inode Attributes structure, used for notify_change(). It | |
215 | * uses the above definitions as flags, to know which values have changed. | |
216 | * Also, in this manner, a Filesystem can look at only the values it cares | |
217 | * about. Basically, these are the attributes that the VFS layer can | |
218 | * request to change from the FS layer. | |
219 | * | |
220 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 | |
221 | */ | |
222 | struct iattr { | |
223 | unsigned int ia_valid; | |
224 | umode_t ia_mode; | |
92361636 EB |
225 | kuid_t ia_uid; |
226 | kgid_t ia_gid; | |
1da177e4 | 227 | loff_t ia_size; |
95582b00 DD |
228 | struct timespec64 ia_atime; |
229 | struct timespec64 ia_mtime; | |
230 | struct timespec64 ia_ctime; | |
cc4e69de MS |
231 | |
232 | /* | |
25985edc | 233 | * Not an attribute, but an auxiliary info for filesystems wanting to |
cc4e69de MS |
234 | * implement an ftruncate() like method. NOTE: filesystem should |
235 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). | |
236 | */ | |
237 | struct file *ia_file; | |
1da177e4 LT |
238 | }; |
239 | ||
1da177e4 LT |
240 | /* |
241 | * Includes for diskquotas. | |
242 | */ | |
243 | #include <linux/quota.h> | |
244 | ||
69c433ed MS |
245 | /* |
246 | * Maximum number of layers of fs stack. Needs to be limited to | |
247 | * prevent kernel stack overflow | |
248 | */ | |
249 | #define FILESYSTEM_MAX_STACK_DEPTH 2 | |
250 | ||
994fc28c ZB |
251 | /** |
252 | * enum positive_aop_returns - aop return codes with specific semantics | |
253 | * | |
254 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has | |
255 | * completed, that the page is still locked, and | |
256 | * should be considered active. The VM uses this hint | |
257 | * to return the page to the active list -- it won't | |
258 | * be a candidate for writeback again in the near | |
259 | * future. Other callers must be careful to unlock | |
260 | * the page if they get this return. Returned by | |
261 | * writepage(); | |
262 | * | |
263 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has | |
264 | * unlocked it and the page might have been truncated. | |
265 | * The caller should back up to acquiring a new page and | |
266 | * trying again. The aop will be taking reasonable | |
267 | * precautions not to livelock. If the caller held a page | |
268 | * reference, it should drop it before retrying. Returned | |
55144768 | 269 | * by readpage(). |
994fc28c ZB |
270 | * |
271 | * address_space_operation functions return these large constants to indicate | |
272 | * special semantics to the caller. These are much larger than the bytes in a | |
273 | * page to allow for functions that return the number of bytes operated on in a | |
274 | * given page. | |
275 | */ | |
276 | ||
277 | enum positive_aop_returns { | |
278 | AOP_WRITEPAGE_ACTIVATE = 0x80000, | |
279 | AOP_TRUNCATED_PAGE = 0x80001, | |
280 | }; | |
281 | ||
c718a975 TH |
282 | #define AOP_FLAG_CONT_EXPAND 0x0001 /* called from cont_expand */ |
283 | #define AOP_FLAG_NOFS 0x0002 /* used by filesystem to direct | |
54566b2c NP |
284 | * helper code (eg buffer layer) |
285 | * to clear GFP_FS from alloc */ | |
afddba49 | 286 | |
1da177e4 LT |
287 | /* |
288 | * oh the beauties of C type declarations. | |
289 | */ | |
290 | struct page; | |
291 | struct address_space; | |
292 | struct writeback_control; | |
1da177e4 | 293 | |
c75b1d94 JA |
294 | /* |
295 | * Write life time hint values. | |
69448867 | 296 | * Stored in struct inode as u8. |
c75b1d94 JA |
297 | */ |
298 | enum rw_hint { | |
299 | WRITE_LIFE_NOT_SET = 0, | |
300 | WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE, | |
301 | WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT, | |
302 | WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, | |
303 | WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, | |
304 | WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, | |
305 | }; | |
306 | ||
e2e40f2c | 307 | #define IOCB_EVENTFD (1 << 0) |
2ba48ce5 AV |
308 | #define IOCB_APPEND (1 << 1) |
309 | #define IOCB_DIRECT (1 << 2) | |
97be7ebe | 310 | #define IOCB_HIPRI (1 << 3) |
dde0c2e7 CH |
311 | #define IOCB_DSYNC (1 << 4) |
312 | #define IOCB_SYNC (1 << 5) | |
70fe2f48 | 313 | #define IOCB_WRITE (1 << 6) |
b745fafa | 314 | #define IOCB_NOWAIT (1 << 7) |
e2e40f2c CH |
315 | |
316 | struct kiocb { | |
317 | struct file *ki_filp; | |
84c4e1f8 LT |
318 | |
319 | /* The 'ki_filp' pointer is shared in a union for aio */ | |
320 | randomized_struct_fields_start | |
321 | ||
e2e40f2c CH |
322 | loff_t ki_pos; |
323 | void (*ki_complete)(struct kiocb *iocb, long ret, long ret2); | |
324 | void *private; | |
325 | int ki_flags; | |
fc28724d | 326 | u16 ki_hint; |
d9a08a9e | 327 | u16 ki_ioprio; /* See linux/ioprio.h */ |
fb7e1600 | 328 | unsigned int ki_cookie; /* for ->iopoll */ |
84c4e1f8 LT |
329 | |
330 | randomized_struct_fields_end | |
331 | }; | |
e2e40f2c CH |
332 | |
333 | static inline bool is_sync_kiocb(struct kiocb *kiocb) | |
334 | { | |
335 | return kiocb->ki_complete == NULL; | |
336 | } | |
337 | ||
8ab22b9a HH |
338 | /* |
339 | * "descriptor" for what we're up to with a read. | |
340 | * This allows us to use the same read code yet | |
341 | * have multiple different users of the data that | |
342 | * we read from a file. | |
343 | * | |
344 | * The simplest case just copies the data to user | |
345 | * mode. | |
346 | */ | |
347 | typedef struct { | |
348 | size_t written; | |
349 | size_t count; | |
350 | union { | |
351 | char __user *buf; | |
352 | void *data; | |
353 | } arg; | |
354 | int error; | |
355 | } read_descriptor_t; | |
356 | ||
357 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, | |
358 | unsigned long, unsigned long); | |
2f718ffc | 359 | |
1da177e4 LT |
360 | struct address_space_operations { |
361 | int (*writepage)(struct page *page, struct writeback_control *wbc); | |
362 | int (*readpage)(struct file *, struct page *); | |
1da177e4 LT |
363 | |
364 | /* Write back some dirty pages from this mapping. */ | |
365 | int (*writepages)(struct address_space *, struct writeback_control *); | |
366 | ||
4741c9fd | 367 | /* Set a page dirty. Return true if this dirtied it */ |
1da177e4 LT |
368 | int (*set_page_dirty)(struct page *page); |
369 | ||
74c8164e JA |
370 | /* |
371 | * Reads in the requested pages. Unlike ->readpage(), this is | |
372 | * PURELY used for read-ahead!. | |
373 | */ | |
1da177e4 LT |
374 | int (*readpages)(struct file *filp, struct address_space *mapping, |
375 | struct list_head *pages, unsigned nr_pages); | |
376 | ||
afddba49 NP |
377 | int (*write_begin)(struct file *, struct address_space *mapping, |
378 | loff_t pos, unsigned len, unsigned flags, | |
379 | struct page **pagep, void **fsdata); | |
380 | int (*write_end)(struct file *, struct address_space *mapping, | |
381 | loff_t pos, unsigned len, unsigned copied, | |
382 | struct page *page, void *fsdata); | |
383 | ||
1da177e4 LT |
384 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
385 | sector_t (*bmap)(struct address_space *, sector_t); | |
d47992f8 | 386 | void (*invalidatepage) (struct page *, unsigned int, unsigned int); |
27496a8c | 387 | int (*releasepage) (struct page *, gfp_t); |
6072d13c | 388 | void (*freepage)(struct page *); |
c8b8e32d | 389 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); |
b969c4ab | 390 | /* |
ef277c73 TC |
391 | * migrate the contents of a page to the specified target. If |
392 | * migrate_mode is MIGRATE_ASYNC, it must not block. | |
b969c4ab | 393 | */ |
2d1db3b1 | 394 | int (*migratepage) (struct address_space *, |
a6bc32b8 | 395 | struct page *, struct page *, enum migrate_mode); |
bda807d4 MK |
396 | bool (*isolate_page)(struct page *, isolate_mode_t); |
397 | void (*putback_page)(struct page *); | |
e3db7691 | 398 | int (*launder_page) (struct page *); |
c186afb4 | 399 | int (*is_partially_uptodate) (struct page *, unsigned long, |
8ab22b9a | 400 | unsigned long); |
b4597226 | 401 | void (*is_dirty_writeback) (struct page *, bool *, bool *); |
25718736 | 402 | int (*error_remove_page)(struct address_space *, struct page *); |
62c230bc MG |
403 | |
404 | /* swapfile support */ | |
a509bc1a MG |
405 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
406 | sector_t *span); | |
407 | void (*swap_deactivate)(struct file *file); | |
1da177e4 LT |
408 | }; |
409 | ||
7dcda1c9 JA |
410 | extern const struct address_space_operations empty_aops; |
411 | ||
afddba49 NP |
412 | /* |
413 | * pagecache_write_begin/pagecache_write_end must be used by general code | |
414 | * to write into the pagecache. | |
415 | */ | |
416 | int pagecache_write_begin(struct file *, struct address_space *mapping, | |
417 | loff_t pos, unsigned len, unsigned flags, | |
418 | struct page **pagep, void **fsdata); | |
419 | ||
420 | int pagecache_write_end(struct file *, struct address_space *mapping, | |
421 | loff_t pos, unsigned len, unsigned copied, | |
422 | struct page *page, void *fsdata); | |
423 | ||
eb797a8e MW |
424 | /** |
425 | * struct address_space - Contents of a cacheable, mappable object. | |
426 | * @host: Owner, either the inode or the block_device. | |
427 | * @i_pages: Cached pages. | |
428 | * @gfp_mask: Memory allocation flags to use for allocating pages. | |
429 | * @i_mmap_writable: Number of VM_SHARED mappings. | |
430 | * @i_mmap: Tree of private and shared mappings. | |
431 | * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable. | |
432 | * @nrpages: Number of page entries, protected by the i_pages lock. | |
433 | * @nrexceptional: Shadow or DAX entries, protected by the i_pages lock. | |
434 | * @writeback_index: Writeback starts here. | |
435 | * @a_ops: Methods. | |
436 | * @flags: Error bits and flags (AS_*). | |
437 | * @wb_err: The most recent error which has occurred. | |
438 | * @private_lock: For use by the owner of the address_space. | |
439 | * @private_list: For use by the owner of the address_space. | |
440 | * @private_data: For use by the owner of the address_space. | |
441 | */ | |
1da177e4 | 442 | struct address_space { |
eb797a8e MW |
443 | struct inode *host; |
444 | struct xarray i_pages; | |
445 | gfp_t gfp_mask; | |
446 | atomic_t i_mmap_writable; | |
447 | struct rb_root_cached i_mmap; | |
448 | struct rw_semaphore i_mmap_rwsem; | |
449 | unsigned long nrpages; | |
f9fe48be | 450 | unsigned long nrexceptional; |
eb797a8e MW |
451 | pgoff_t writeback_index; |
452 | const struct address_space_operations *a_ops; | |
453 | unsigned long flags; | |
5660e13d | 454 | errseq_t wb_err; |
eb797a8e MW |
455 | spinlock_t private_lock; |
456 | struct list_head private_list; | |
457 | void *private_data; | |
3859a271 | 458 | } __attribute__((aligned(sizeof(long)))) __randomize_layout; |
1da177e4 LT |
459 | /* |
460 | * On most architectures that alignment is already the case; but | |
25985edc | 461 | * must be enforced here for CRIS, to let the least significant bit |
1da177e4 LT |
462 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
463 | */ | |
87192a2a | 464 | struct request_queue; |
1da177e4 LT |
465 | |
466 | struct block_device { | |
467 | dev_t bd_dev; /* not a kdev_t - it's a search key */ | |
f3ccfcda | 468 | int bd_openers; |
1da177e4 | 469 | struct inode * bd_inode; /* will die */ |
87d8fe1e | 470 | struct super_block * bd_super; |
c039e313 | 471 | struct mutex bd_mutex; /* open/close mutex */ |
6b4517a7 | 472 | void * bd_claiming; |
1da177e4 LT |
473 | void * bd_holder; |
474 | int bd_holders; | |
77ea887e | 475 | bool bd_write_holder; |
641dc636 | 476 | #ifdef CONFIG_SYSFS |
49731baa | 477 | struct list_head bd_holder_disks; |
641dc636 | 478 | #endif |
1da177e4 LT |
479 | struct block_device * bd_contains; |
480 | unsigned bd_block_size; | |
c2ee070f | 481 | u8 bd_partno; |
1da177e4 LT |
482 | struct hd_struct * bd_part; |
483 | /* number of times partitions within this device have been opened. */ | |
484 | unsigned bd_part_count; | |
485 | int bd_invalidated; | |
486 | struct gendisk * bd_disk; | |
87192a2a | 487 | struct request_queue * bd_queue; |
b1d2dc56 | 488 | struct backing_dev_info *bd_bdi; |
1da177e4 | 489 | struct list_head bd_list; |
1da177e4 LT |
490 | /* |
491 | * Private data. You must have bd_claim'ed the block_device | |
492 | * to use this. NOTE: bd_claim allows an owner to claim | |
493 | * the same device multiple times, the owner must take special | |
494 | * care to not mess up bd_private for that case. | |
495 | */ | |
496 | unsigned long bd_private; | |
fcccf502 TS |
497 | |
498 | /* The counter of freeze processes */ | |
499 | int bd_fsfreeze_count; | |
500 | /* Mutex for freeze */ | |
501 | struct mutex bd_fsfreeze_mutex; | |
3859a271 | 502 | } __randomize_layout; |
1da177e4 | 503 | |
ff9c745b MW |
504 | /* XArray tags, for tagging dirty and writeback pages in the pagecache. */ |
505 | #define PAGECACHE_TAG_DIRTY XA_MARK_0 | |
506 | #define PAGECACHE_TAG_WRITEBACK XA_MARK_1 | |
507 | #define PAGECACHE_TAG_TOWRITE XA_MARK_2 | |
508 | ||
1da177e4 | 509 | /* |
ff9c745b | 510 | * Returns true if any of the pages in the mapping are marked with the tag. |
1da177e4 | 511 | */ |
ff9c745b MW |
512 | static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag) |
513 | { | |
514 | return xa_marked(&mapping->i_pages, tag); | |
515 | } | |
1da177e4 | 516 | |
8b28f621 DB |
517 | static inline void i_mmap_lock_write(struct address_space *mapping) |
518 | { | |
c8c06efa | 519 | down_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
520 | } |
521 | ||
522 | static inline void i_mmap_unlock_write(struct address_space *mapping) | |
523 | { | |
c8c06efa | 524 | up_write(&mapping->i_mmap_rwsem); |
8b28f621 DB |
525 | } |
526 | ||
3dec0ba0 DB |
527 | static inline void i_mmap_lock_read(struct address_space *mapping) |
528 | { | |
529 | down_read(&mapping->i_mmap_rwsem); | |
530 | } | |
531 | ||
532 | static inline void i_mmap_unlock_read(struct address_space *mapping) | |
533 | { | |
534 | up_read(&mapping->i_mmap_rwsem); | |
535 | } | |
536 | ||
1da177e4 LT |
537 | /* |
538 | * Might pages of this file be mapped into userspace? | |
539 | */ | |
540 | static inline int mapping_mapped(struct address_space *mapping) | |
541 | { | |
f808c13f | 542 | return !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root); |
1da177e4 LT |
543 | } |
544 | ||
545 | /* | |
546 | * Might pages of this file have been modified in userspace? | |
547 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff | |
548 | * marks vma as VM_SHARED if it is shared, and the file was opened for | |
549 | * writing i.e. vma may be mprotected writable even if now readonly. | |
4bb5f5d9 DH |
550 | * |
551 | * If i_mmap_writable is negative, no new writable mappings are allowed. You | |
552 | * can only deny writable mappings, if none exists right now. | |
1da177e4 LT |
553 | */ |
554 | static inline int mapping_writably_mapped(struct address_space *mapping) | |
555 | { | |
4bb5f5d9 DH |
556 | return atomic_read(&mapping->i_mmap_writable) > 0; |
557 | } | |
558 | ||
559 | static inline int mapping_map_writable(struct address_space *mapping) | |
560 | { | |
561 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? | |
562 | 0 : -EPERM; | |
563 | } | |
564 | ||
565 | static inline void mapping_unmap_writable(struct address_space *mapping) | |
566 | { | |
567 | atomic_dec(&mapping->i_mmap_writable); | |
568 | } | |
569 | ||
570 | static inline int mapping_deny_writable(struct address_space *mapping) | |
571 | { | |
572 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? | |
573 | 0 : -EBUSY; | |
574 | } | |
575 | ||
576 | static inline void mapping_allow_writable(struct address_space *mapping) | |
577 | { | |
578 | atomic_inc(&mapping->i_mmap_writable); | |
1da177e4 LT |
579 | } |
580 | ||
581 | /* | |
582 | * Use sequence counter to get consistent i_size on 32-bit processors. | |
583 | */ | |
584 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
585 | #include <linux/seqlock.h> | |
586 | #define __NEED_I_SIZE_ORDERED | |
587 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) | |
588 | #else | |
589 | #define i_size_ordered_init(inode) do { } while (0) | |
590 | #endif | |
591 | ||
f19d4a8f AV |
592 | struct posix_acl; |
593 | #define ACL_NOT_CACHED ((void *)(-1)) | |
2a3a2a3f | 594 | #define ACL_DONT_CACHE ((void *)(-3)) |
f19d4a8f | 595 | |
b8a7a3a6 AG |
596 | static inline struct posix_acl * |
597 | uncached_acl_sentinel(struct task_struct *task) | |
598 | { | |
599 | return (void *)task + 1; | |
600 | } | |
601 | ||
602 | static inline bool | |
603 | is_uncached_acl(struct posix_acl *acl) | |
604 | { | |
605 | return (long)acl & 1; | |
606 | } | |
607 | ||
3ddcd056 LT |
608 | #define IOP_FASTPERM 0x0001 |
609 | #define IOP_LOOKUP 0x0002 | |
610 | #define IOP_NOFOLLOW 0x0004 | |
d0a5b995 | 611 | #define IOP_XATTR 0x0008 |
76fca90e | 612 | #define IOP_DEFAULT_READLINK 0x0010 |
3ddcd056 | 613 | |
9dd813c1 JK |
614 | struct fsnotify_mark_connector; |
615 | ||
3ddcd056 LT |
616 | /* |
617 | * Keep mostly read-only and often accessed (especially for | |
618 | * the RCU path lookup and 'stat' data) fields at the beginning | |
619 | * of the 'struct inode' | |
620 | */ | |
1da177e4 | 621 | struct inode { |
44a7d7a8 | 622 | umode_t i_mode; |
3ddcd056 | 623 | unsigned short i_opflags; |
92361636 EB |
624 | kuid_t i_uid; |
625 | kgid_t i_gid; | |
3ddcd056 LT |
626 | unsigned int i_flags; |
627 | ||
628 | #ifdef CONFIG_FS_POSIX_ACL | |
629 | struct posix_acl *i_acl; | |
630 | struct posix_acl *i_default_acl; | |
631 | #endif | |
632 | ||
44a7d7a8 NP |
633 | const struct inode_operations *i_op; |
634 | struct super_block *i_sb; | |
3ddcd056 | 635 | struct address_space *i_mapping; |
44a7d7a8 | 636 | |
13e12d14 LT |
637 | #ifdef CONFIG_SECURITY |
638 | void *i_security; | |
639 | #endif | |
44a7d7a8 | 640 | |
3ddcd056 LT |
641 | /* Stat data, not accessed from path walking */ |
642 | unsigned long i_ino; | |
a78ef704 MS |
643 | /* |
644 | * Filesystems may only read i_nlink directly. They shall use the | |
645 | * following functions for modification: | |
646 | * | |
647 | * (set|clear|inc|drop)_nlink | |
648 | * inode_(inc|dec)_link_count | |
649 | */ | |
650 | union { | |
651 | const unsigned int i_nlink; | |
652 | unsigned int __i_nlink; | |
653 | }; | |
3ddcd056 | 654 | dev_t i_rdev; |
2f9d3df8 | 655 | loff_t i_size; |
95582b00 DD |
656 | struct timespec64 i_atime; |
657 | struct timespec64 i_mtime; | |
658 | struct timespec64 i_ctime; | |
6cdbb0ef TT |
659 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
660 | unsigned short i_bytes; | |
69448867 AG |
661 | u8 i_blkbits; |
662 | u8 i_write_hint; | |
3ddcd056 LT |
663 | blkcnt_t i_blocks; |
664 | ||
665 | #ifdef __NEED_I_SIZE_ORDERED | |
666 | seqcount_t i_size_seqcount; | |
667 | #endif | |
668 | ||
669 | /* Misc */ | |
670 | unsigned long i_state; | |
9902af79 | 671 | struct rw_semaphore i_rwsem; |
13e12d14 | 672 | |
44a7d7a8 | 673 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
a2f48706 | 674 | unsigned long dirtied_time_when; |
44a7d7a8 | 675 | |
1da177e4 | 676 | struct hlist_node i_hash; |
c7f54084 | 677 | struct list_head i_io_list; /* backing dev IO list */ |
52ebea74 TH |
678 | #ifdef CONFIG_CGROUP_WRITEBACK |
679 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ | |
2a814908 TH |
680 | |
681 | /* foreign inode detection, see wbc_detach_inode() */ | |
682 | int i_wb_frn_winner; | |
683 | u16 i_wb_frn_avg_time; | |
684 | u16 i_wb_frn_history; | |
52ebea74 | 685 | #endif |
7ccf19a8 | 686 | struct list_head i_lru; /* inode LRU list */ |
1da177e4 | 687 | struct list_head i_sb_list; |
6c60d2b5 | 688 | struct list_head i_wb_list; /* backing dev writeback list */ |
fa0d7e3d | 689 | union { |
b3d9b7a3 | 690 | struct hlist_head i_dentry; |
fa0d7e3d NP |
691 | struct rcu_head i_rcu; |
692 | }; | |
f02a9ad1 | 693 | atomic64_t i_version; |
2f9d3df8 | 694 | atomic_t i_count; |
bd5fe6c5 | 695 | atomic_t i_dio_count; |
6cdbb0ef | 696 | atomic_t i_writecount; |
d984ea60 MZ |
697 | #ifdef CONFIG_IMA |
698 | atomic_t i_readcount; /* struct files open RO */ | |
699 | #endif | |
fdb0da89 AV |
700 | union { |
701 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ | |
702 | void (*free_inode)(struct inode *); | |
703 | }; | |
4a075e39 | 704 | struct file_lock_context *i_flctx; |
1da177e4 | 705 | struct address_space i_data; |
1da177e4 | 706 | struct list_head i_devices; |
4c154168 TT |
707 | union { |
708 | struct pipe_inode_info *i_pipe; | |
eaf796e7 | 709 | struct block_device *i_bdev; |
577c4eb0 | 710 | struct cdev *i_cdev; |
61ba64fc | 711 | char *i_link; |
84e710da | 712 | unsigned i_dir_seq; |
4c154168 | 713 | }; |
1da177e4 LT |
714 | |
715 | __u32 i_generation; | |
716 | ||
3be25f49 EP |
717 | #ifdef CONFIG_FSNOTIFY |
718 | __u32 i_fsnotify_mask; /* all events this inode cares about */ | |
08991e83 | 719 | struct fsnotify_mark_connector __rcu *i_fsnotify_marks; |
0eeca283 RL |
720 | #endif |
721 | ||
643fa961 | 722 | #ifdef CONFIG_FS_ENCRYPTION |
0b81d077 JK |
723 | struct fscrypt_info *i_crypt_info; |
724 | #endif | |
725 | ||
8e18e294 | 726 | void *i_private; /* fs or device private pointer */ |
3859a271 | 727 | } __randomize_layout; |
1da177e4 | 728 | |
93407472 FF |
729 | static inline unsigned int i_blocksize(const struct inode *node) |
730 | { | |
731 | return (1 << node->i_blkbits); | |
732 | } | |
733 | ||
1d3382cb AV |
734 | static inline int inode_unhashed(struct inode *inode) |
735 | { | |
736 | return hlist_unhashed(&inode->i_hash); | |
737 | } | |
738 | ||
5bef9151 AV |
739 | /* |
740 | * __mark_inode_dirty expects inodes to be hashed. Since we don't | |
741 | * want special inodes in the fileset inode space, we make them | |
742 | * appear hashed, but do not put on any lists. hlist_del() | |
743 | * will work fine and require no locking. | |
744 | */ | |
745 | static inline void inode_fake_hash(struct inode *inode) | |
746 | { | |
747 | hlist_add_fake(&inode->i_hash); | |
748 | } | |
749 | ||
f2eace23 IM |
750 | /* |
751 | * inode->i_mutex nesting subclasses for the lock validator: | |
752 | * | |
753 | * 0: the object of the current VFS operation | |
754 | * 1: parent | |
755 | * 2: child/target | |
40bd22c9 BF |
756 | * 3: xattr |
757 | * 4: second non-directory | |
d1b72cc6 MS |
758 | * 5: second parent (when locking independent directories in rename) |
759 | * | |
760 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two | |
40bd22c9 | 761 | * non-directories at once. |
f2eace23 IM |
762 | * |
763 | * The locking order between these classes is | |
d1b72cc6 | 764 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
f2eace23 IM |
765 | */ |
766 | enum inode_i_mutex_lock_class | |
767 | { | |
768 | I_MUTEX_NORMAL, | |
769 | I_MUTEX_PARENT, | |
770 | I_MUTEX_CHILD, | |
4df46240 | 771 | I_MUTEX_XATTR, |
d1b72cc6 MS |
772 | I_MUTEX_NONDIR2, |
773 | I_MUTEX_PARENT2, | |
f2eace23 IM |
774 | }; |
775 | ||
5955102c AV |
776 | static inline void inode_lock(struct inode *inode) |
777 | { | |
9902af79 | 778 | down_write(&inode->i_rwsem); |
5955102c AV |
779 | } |
780 | ||
781 | static inline void inode_unlock(struct inode *inode) | |
782 | { | |
9902af79 AV |
783 | up_write(&inode->i_rwsem); |
784 | } | |
785 | ||
786 | static inline void inode_lock_shared(struct inode *inode) | |
787 | { | |
788 | down_read(&inode->i_rwsem); | |
789 | } | |
790 | ||
791 | static inline void inode_unlock_shared(struct inode *inode) | |
792 | { | |
793 | up_read(&inode->i_rwsem); | |
5955102c AV |
794 | } |
795 | ||
796 | static inline int inode_trylock(struct inode *inode) | |
797 | { | |
9902af79 AV |
798 | return down_write_trylock(&inode->i_rwsem); |
799 | } | |
800 | ||
801 | static inline int inode_trylock_shared(struct inode *inode) | |
802 | { | |
803 | return down_read_trylock(&inode->i_rwsem); | |
5955102c AV |
804 | } |
805 | ||
806 | static inline int inode_is_locked(struct inode *inode) | |
807 | { | |
9902af79 | 808 | return rwsem_is_locked(&inode->i_rwsem); |
5955102c AV |
809 | } |
810 | ||
811 | static inline void inode_lock_nested(struct inode *inode, unsigned subclass) | |
812 | { | |
9902af79 | 813 | down_write_nested(&inode->i_rwsem, subclass); |
5955102c AV |
814 | } |
815 | ||
01c2e13d DW |
816 | static inline void inode_lock_shared_nested(struct inode *inode, unsigned subclass) |
817 | { | |
818 | down_read_nested(&inode->i_rwsem, subclass); | |
819 | } | |
820 | ||
375e289e BF |
821 | void lock_two_nondirectories(struct inode *, struct inode*); |
822 | void unlock_two_nondirectories(struct inode *, struct inode*); | |
823 | ||
1da177e4 LT |
824 | /* |
825 | * NOTE: in a 32bit arch with a preemptable kernel and | |
826 | * an UP compile the i_size_read/write must be atomic | |
827 | * with respect to the local cpu (unlike with preempt disabled), | |
828 | * but they don't need to be atomic with respect to other cpus like in | |
829 | * true SMP (so they need either to either locally disable irq around | |
830 | * the read or for example on x86 they can be still implemented as a | |
831 | * cmpxchg8b without the need of the lock prefix). For SMP compiles | |
832 | * and 64bit archs it makes no difference if preempt is enabled or not. | |
833 | */ | |
48ed214d | 834 | static inline loff_t i_size_read(const struct inode *inode) |
1da177e4 LT |
835 | { |
836 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
837 | loff_t i_size; | |
838 | unsigned int seq; | |
839 | ||
840 | do { | |
841 | seq = read_seqcount_begin(&inode->i_size_seqcount); | |
842 | i_size = inode->i_size; | |
843 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); | |
844 | return i_size; | |
845 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) | |
846 | loff_t i_size; | |
847 | ||
848 | preempt_disable(); | |
849 | i_size = inode->i_size; | |
850 | preempt_enable(); | |
851 | return i_size; | |
852 | #else | |
853 | return inode->i_size; | |
854 | #endif | |
855 | } | |
856 | ||
7762f5a0 MS |
857 | /* |
858 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it | |
859 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount | |
860 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. | |
861 | */ | |
1da177e4 LT |
862 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
863 | { | |
864 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) | |
74e3d1e1 | 865 | preempt_disable(); |
1da177e4 LT |
866 | write_seqcount_begin(&inode->i_size_seqcount); |
867 | inode->i_size = i_size; | |
868 | write_seqcount_end(&inode->i_size_seqcount); | |
74e3d1e1 | 869 | preempt_enable(); |
1da177e4 LT |
870 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
871 | preempt_disable(); | |
872 | inode->i_size = i_size; | |
873 | preempt_enable(); | |
874 | #else | |
875 | inode->i_size = i_size; | |
876 | #endif | |
877 | } | |
878 | ||
48ed214d | 879 | static inline unsigned iminor(const struct inode *inode) |
1da177e4 LT |
880 | { |
881 | return MINOR(inode->i_rdev); | |
882 | } | |
883 | ||
48ed214d | 884 | static inline unsigned imajor(const struct inode *inode) |
1da177e4 LT |
885 | { |
886 | return MAJOR(inode->i_rdev); | |
887 | } | |
888 | ||
889 | extern struct block_device *I_BDEV(struct inode *inode); | |
890 | ||
891 | struct fown_struct { | |
892 | rwlock_t lock; /* protects pid, uid, euid fields */ | |
609d7fa9 EB |
893 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
894 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ | |
92361636 | 895 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
1da177e4 LT |
896 | int signum; /* posix.1b rt signal to be delivered on IO */ |
897 | }; | |
898 | ||
899 | /* | |
900 | * Track a single file's readahead state | |
901 | */ | |
902 | struct file_ra_state { | |
937085aa FW |
903 | pgoff_t start; /* where readahead started */ |
904 | unsigned int size; /* # of readahead pages */ | |
905 | unsigned int async_size; /* do asynchronous readahead when | |
f9acc8c7 | 906 | there are only # of pages ahead */ |
5ce1110b | 907 | |
937085aa | 908 | unsigned int ra_pages; /* Maximum readahead window */ |
1ebf26a9 | 909 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
f4e6b498 | 910 | loff_t prev_pos; /* Cache last read() position */ |
1da177e4 | 911 | }; |
1da177e4 | 912 | |
5ce1110b FW |
913 | /* |
914 | * Check if @index falls in the readahead windows. | |
915 | */ | |
916 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) | |
917 | { | |
f9acc8c7 FW |
918 | return (index >= ra->start && |
919 | index < ra->start + ra->size); | |
5ce1110b FW |
920 | } |
921 | ||
1da177e4 | 922 | struct file { |
2f512016 | 923 | union { |
4f5e65a1 | 924 | struct llist_node fu_llist; |
2f512016 ED |
925 | struct rcu_head fu_rcuhead; |
926 | } f_u; | |
0f7fc9e4 | 927 | struct path f_path; |
dd37978c | 928 | struct inode *f_inode; /* cached value */ |
99ac48f5 | 929 | const struct file_operations *f_op; |
ef3d0fd2 AK |
930 | |
931 | /* | |
9c225f26 | 932 | * Protects f_ep_links, f_flags. |
ef3d0fd2 AK |
933 | * Must not be taken from IRQ context. |
934 | */ | |
935 | spinlock_t f_lock; | |
c75b1d94 | 936 | enum rw_hint f_write_hint; |
516e0cc5 | 937 | atomic_long_t f_count; |
1da177e4 | 938 | unsigned int f_flags; |
aeb5d727 | 939 | fmode_t f_mode; |
9c225f26 | 940 | struct mutex f_pos_lock; |
1da177e4 LT |
941 | loff_t f_pos; |
942 | struct fown_struct f_owner; | |
d76b0d9b | 943 | const struct cred *f_cred; |
1da177e4 LT |
944 | struct file_ra_state f_ra; |
945 | ||
2b47c361 | 946 | u64 f_version; |
50462062 | 947 | #ifdef CONFIG_SECURITY |
1da177e4 | 948 | void *f_security; |
50462062 | 949 | #endif |
1da177e4 LT |
950 | /* needed for tty driver, and maybe others */ |
951 | void *private_data; | |
952 | ||
953 | #ifdef CONFIG_EPOLL | |
954 | /* Used by fs/eventpoll.c to link all the hooks to this file */ | |
955 | struct list_head f_ep_links; | |
28d82dc1 | 956 | struct list_head f_tfile_llink; |
1da177e4 LT |
957 | #endif /* #ifdef CONFIG_EPOLL */ |
958 | struct address_space *f_mapping; | |
5660e13d | 959 | errseq_t f_wb_err; |
3859a271 KC |
960 | } __randomize_layout |
961 | __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ | |
1da177e4 | 962 | |
990d6c2d AK |
963 | struct file_handle { |
964 | __u32 handle_bytes; | |
965 | int handle_type; | |
966 | /* file identifier */ | |
967 | unsigned char f_handle[0]; | |
968 | }; | |
969 | ||
cb0942b8 AV |
970 | static inline struct file *get_file(struct file *f) |
971 | { | |
972 | atomic_long_inc(&f->f_count); | |
973 | return f; | |
974 | } | |
091141a4 JA |
975 | #define get_file_rcu_many(x, cnt) \ |
976 | atomic_long_add_unless(&(x)->f_count, (cnt), 0) | |
977 | #define get_file_rcu(x) get_file_rcu_many((x), 1) | |
516e0cc5 | 978 | #define file_count(x) atomic_long_read(&(x)->f_count) |
1da177e4 LT |
979 | |
980 | #define MAX_NON_LFS ((1UL<<31) - 1) | |
981 | ||
982 | /* Page cache limit. The filesystems should put that into their s_maxbytes | |
983 | limits, otherwise bad things can happen in VM. */ | |
984 | #if BITS_PER_LONG==32 | |
0cc3b0ec | 985 | #define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT) |
1da177e4 | 986 | #elif BITS_PER_LONG==64 |
0cc3b0ec | 987 | #define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX) |
1da177e4 LT |
988 | #endif |
989 | ||
990 | #define FL_POSIX 1 | |
991 | #define FL_FLOCK 2 | |
617588d5 | 992 | #define FL_DELEG 4 /* NFSv4 delegation */ |
1da177e4 | 993 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
f475ae95 | 994 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1da177e4 | 995 | #define FL_LEASE 32 /* lease held on this file */ |
75e1fcc0 | 996 | #define FL_CLOSE 64 /* unlock on close */ |
1da177e4 | 997 | #define FL_SLEEP 128 /* A blocking lock */ |
778fc546 BF |
998 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
999 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ | |
cff2fce5 | 1000 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
11afe9f7 | 1001 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
1da177e4 | 1002 | |
50f2112c BC |
1003 | #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE) |
1004 | ||
bde74e4b MS |
1005 | /* |
1006 | * Special return value from posix_lock_file() and vfs_lock_file() for | |
1007 | * asynchronous locking. | |
1008 | */ | |
1009 | #define FILE_LOCK_DEFERRED 1 | |
1010 | ||
7ca76311 | 1011 | /* legacy typedef, should eventually be removed */ |
17fa388d | 1012 | typedef void *fl_owner_t; |
1da177e4 | 1013 | |
a7231a97 JL |
1014 | struct file_lock; |
1015 | ||
1da177e4 | 1016 | struct file_lock_operations { |
1da177e4 LT |
1017 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
1018 | void (*fl_release_private)(struct file_lock *); | |
1019 | }; | |
1020 | ||
1021 | struct lock_manager_operations { | |
8fb47a4f | 1022 | int (*lm_compare_owner)(struct file_lock *, struct file_lock *); |
3999e493 | 1023 | unsigned long (*lm_owner_key)(struct file_lock *); |
cae80b30 JL |
1024 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
1025 | void (*lm_put_owner)(fl_owner_t); | |
8fb47a4f | 1026 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
d0449b90 | 1027 | int (*lm_grant)(struct file_lock *, int); |
4d01b7f5 | 1028 | bool (*lm_break)(struct file_lock *); |
7448cc37 | 1029 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
1c7dd2ff | 1030 | void (*lm_setup)(struct file_lock *, void **); |
1da177e4 LT |
1031 | }; |
1032 | ||
af558e33 BF |
1033 | struct lock_manager { |
1034 | struct list_head list; | |
c87fb4a3 BF |
1035 | /* |
1036 | * NFSv4 and up also want opens blocked during the grace period; | |
1037 | * NLM doesn't care: | |
1038 | */ | |
1039 | bool block_opens; | |
af558e33 BF |
1040 | }; |
1041 | ||
5ccb0066 SK |
1042 | struct net; |
1043 | void locks_start_grace(struct net *, struct lock_manager *); | |
af558e33 | 1044 | void locks_end_grace(struct lock_manager *); |
003278e4 CL |
1045 | bool locks_in_grace(struct net *); |
1046 | bool opens_in_grace(struct net *); | |
af558e33 | 1047 | |
1da177e4 LT |
1048 | /* that will die - we need it for nfs_lock_info */ |
1049 | #include <linux/nfs_fs_i.h> | |
1050 | ||
1cb36012 JL |
1051 | /* |
1052 | * struct file_lock represents a generic "file lock". It's used to represent | |
1053 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to | |
1054 | * note that the same struct is used to represent both a request for a lock and | |
1055 | * the lock itself, but the same object is never used for both. | |
1056 | * | |
1057 | * FIXME: should we create a separate "struct lock_request" to help distinguish | |
1058 | * these two uses? | |
1059 | * | |
8116bf4c | 1060 | * The varous i_flctx lists are ordered by: |
1cb36012 | 1061 | * |
8116bf4c JL |
1062 | * 1) lock owner |
1063 | * 2) lock range start | |
1064 | * 3) lock range end | |
1cb36012 JL |
1065 | * |
1066 | * Obviously, the last two criteria only matter for POSIX locks. | |
1067 | */ | |
1da177e4 | 1068 | struct file_lock { |
ada5c1da | 1069 | struct file_lock *fl_blocker; /* The lock, that is blocking us */ |
6dee60f6 | 1070 | struct list_head fl_list; /* link into file_lock_context */ |
139ca04e | 1071 | struct hlist_node fl_link; /* node in global lists */ |
ada5c1da N |
1072 | struct list_head fl_blocked_requests; /* list of requests with |
1073 | * ->fl_blocker pointing here | |
1074 | */ | |
1075 | struct list_head fl_blocked_member; /* node in | |
1076 | * ->fl_blocker->fl_blocked_requests | |
1077 | */ | |
1da177e4 | 1078 | fl_owner_t fl_owner; |
710b7216 | 1079 | unsigned int fl_flags; |
afc1246f | 1080 | unsigned char fl_type; |
1da177e4 | 1081 | unsigned int fl_pid; |
7012b02a | 1082 | int fl_link_cpu; /* what cpu's list is this on? */ |
1da177e4 LT |
1083 | wait_queue_head_t fl_wait; |
1084 | struct file *fl_file; | |
1da177e4 LT |
1085 | loff_t fl_start; |
1086 | loff_t fl_end; | |
1087 | ||
1088 | struct fasync_struct * fl_fasync; /* for lease break notifications */ | |
778fc546 BF |
1089 | /* for lease breaks: */ |
1090 | unsigned long fl_break_time; | |
1091 | unsigned long fl_downgrade_time; | |
1da177e4 | 1092 | |
6aed6285 | 1093 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
7b021967 | 1094 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1da177e4 LT |
1095 | union { |
1096 | struct nfs_lock_info nfs_fl; | |
8d0a8a9d | 1097 | struct nfs4_lock_info nfs4_fl; |
e8d6c554 DH |
1098 | struct { |
1099 | struct list_head link; /* link in AFS vnode's pending_locks list */ | |
1100 | int state; /* state of grant or error if -ve */ | |
d4696601 | 1101 | unsigned int debug_id; |
e8d6c554 | 1102 | } afs; |
1da177e4 | 1103 | } fl_u; |
3859a271 | 1104 | } __randomize_layout; |
1da177e4 | 1105 | |
4a075e39 | 1106 | struct file_lock_context { |
6109c850 | 1107 | spinlock_t flc_lock; |
4a075e39 | 1108 | struct list_head flc_flock; |
bd61e0a9 | 1109 | struct list_head flc_posix; |
8634b51f | 1110 | struct list_head flc_lease; |
4a075e39 JL |
1111 | }; |
1112 | ||
1da177e4 LT |
1113 | /* The following constant reflects the upper bound of the file/locking space */ |
1114 | #ifndef OFFSET_MAX | |
1115 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) | |
1116 | #define OFFSET_MAX INT_LIMIT(loff_t) | |
1117 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) | |
1118 | #endif | |
1119 | ||
bfcd17a6 TP |
1120 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1121 | ||
de2a4a50 | 1122 | #define locks_inode(f) file_inode(f) |
c568d683 | 1123 | |
bfcd17a6 | 1124 | #ifdef CONFIG_FILE_LOCKING |
a75d30c7 | 1125 | extern int fcntl_getlk(struct file *, unsigned int, struct flock *); |
c293621b | 1126 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
a75d30c7 | 1127 | struct flock *); |
1da177e4 LT |
1128 | |
1129 | #if BITS_PER_LONG == 32 | |
a75d30c7 | 1130 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *); |
c293621b | 1131 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
a75d30c7 | 1132 | struct flock64 *); |
1da177e4 LT |
1133 | #endif |
1134 | ||
1da177e4 LT |
1135 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1136 | extern int fcntl_getlease(struct file *filp); | |
1137 | ||
1138 | /* fs/locks.c */ | |
f27a0fe0 | 1139 | void locks_free_lock_context(struct inode *inode); |
05fa3135 | 1140 | void locks_free_lock(struct file_lock *fl); |
1da177e4 | 1141 | extern void locks_init_lock(struct file_lock *); |
c5b1f0d9 | 1142 | extern struct file_lock * locks_alloc_lock(void); |
1da177e4 | 1143 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
3fe0fff1 | 1144 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
1da177e4 | 1145 | extern void locks_remove_posix(struct file *, fl_owner_t); |
78ed8a13 | 1146 | extern void locks_remove_file(struct file *); |
a9e61e25 | 1147 | extern void locks_release_private(struct file_lock *); |
6d34ac19 | 1148 | extern void posix_test_lock(struct file *, struct file_lock *); |
150b3934 | 1149 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
cb03f94f | 1150 | extern int locks_delete_block(struct file_lock *); |
3ee17abd | 1151 | extern int vfs_test_lock(struct file *, struct file_lock *); |
150b3934 | 1152 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
9b9d2ab4 | 1153 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
e55c34a6 | 1154 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
df4e8d2c | 1155 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
95582b00 | 1156 | extern void lease_get_mtime(struct inode *, struct timespec64 *time); |
e6f5c789 JL |
1157 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
1158 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); | |
7448cc37 | 1159 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
6c8c9031 AV |
1160 | struct files_struct; |
1161 | extern void show_fd_locks(struct seq_file *f, | |
1162 | struct file *filp, struct files_struct *files); | |
bfcd17a6 | 1163 | #else /* !CONFIG_FILE_LOCKING */ |
c1e62b8f JL |
1164 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
1165 | struct flock __user *user) | |
c2aca5e5 SW |
1166 | { |
1167 | return -EINVAL; | |
1168 | } | |
1169 | ||
1170 | static inline int fcntl_setlk(unsigned int fd, struct file *file, | |
1171 | unsigned int cmd, struct flock __user *user) | |
1172 | { | |
1173 | return -EACCES; | |
1174 | } | |
1175 | ||
bfcd17a6 | 1176 | #if BITS_PER_LONG == 32 |
c1e62b8f JL |
1177 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
1178 | struct flock64 __user *user) | |
c2aca5e5 SW |
1179 | { |
1180 | return -EINVAL; | |
1181 | } | |
1182 | ||
1183 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, | |
1184 | unsigned int cmd, struct flock64 __user *user) | |
1185 | { | |
1186 | return -EACCES; | |
1187 | } | |
bfcd17a6 | 1188 | #endif |
c2aca5e5 SW |
1189 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1190 | { | |
1b2b32dc | 1191 | return -EINVAL; |
c2aca5e5 SW |
1192 | } |
1193 | ||
1194 | static inline int fcntl_getlease(struct file *filp) | |
1195 | { | |
1b2b32dc | 1196 | return F_UNLCK; |
c2aca5e5 SW |
1197 | } |
1198 | ||
4a075e39 | 1199 | static inline void |
f27a0fe0 | 1200 | locks_free_lock_context(struct inode *inode) |
4a075e39 JL |
1201 | { |
1202 | } | |
1203 | ||
c2aca5e5 SW |
1204 | static inline void locks_init_lock(struct file_lock *fl) |
1205 | { | |
1206 | return; | |
1207 | } | |
1208 | ||
3fe0fff1 | 1209 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
c2aca5e5 SW |
1210 | { |
1211 | return; | |
1212 | } | |
1213 | ||
1214 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) | |
1215 | { | |
1216 | return; | |
1217 | } | |
1218 | ||
1219 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) | |
1220 | { | |
1221 | return; | |
1222 | } | |
1223 | ||
78ed8a13 | 1224 | static inline void locks_remove_file(struct file *filp) |
c2aca5e5 SW |
1225 | { |
1226 | return; | |
1227 | } | |
1228 | ||
1229 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) | |
1230 | { | |
1231 | return; | |
1232 | } | |
1233 | ||
1234 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, | |
1235 | struct file_lock *conflock) | |
1236 | { | |
1237 | return -ENOLCK; | |
1238 | } | |
1239 | ||
cb03f94f | 1240 | static inline int locks_delete_block(struct file_lock *waiter) |
c2aca5e5 SW |
1241 | { |
1242 | return -ENOENT; | |
1243 | } | |
1244 | ||
1245 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) | |
1246 | { | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, | |
1251 | struct file_lock *fl, struct file_lock *conf) | |
1252 | { | |
1253 | return -ENOLCK; | |
1254 | } | |
1255 | ||
1256 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) | |
1257 | { | |
1258 | return 0; | |
1259 | } | |
1260 | ||
e55c34a6 BC |
1261 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
1262 | { | |
1263 | return -ENOLCK; | |
1264 | } | |
1265 | ||
df4e8d2c | 1266 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
c2aca5e5 SW |
1267 | { |
1268 | return 0; | |
1269 | } | |
1270 | ||
95582b00 DD |
1271 | static inline void lease_get_mtime(struct inode *inode, |
1272 | struct timespec64 *time) | |
c2aca5e5 SW |
1273 | { |
1274 | return; | |
1275 | } | |
1276 | ||
1277 | static inline int generic_setlease(struct file *filp, long arg, | |
e6f5c789 | 1278 | struct file_lock **flp, void **priv) |
c2aca5e5 SW |
1279 | { |
1280 | return -EINVAL; | |
1281 | } | |
1282 | ||
1283 | static inline int vfs_setlease(struct file *filp, long arg, | |
e6f5c789 | 1284 | struct file_lock **lease, void **priv) |
c2aca5e5 SW |
1285 | { |
1286 | return -EINVAL; | |
1287 | } | |
1288 | ||
7448cc37 | 1289 | static inline int lease_modify(struct file_lock *fl, int arg, |
c45198ed | 1290 | struct list_head *dispose) |
c2aca5e5 SW |
1291 | { |
1292 | return -EINVAL; | |
1293 | } | |
6c8c9031 AV |
1294 | |
1295 | struct files_struct; | |
1296 | static inline void show_fd_locks(struct seq_file *f, | |
1297 | struct file *filp, struct files_struct *files) {} | |
bfcd17a6 TP |
1298 | #endif /* !CONFIG_FILE_LOCKING */ |
1299 | ||
ee296d7c JL |
1300 | static inline struct inode *file_inode(const struct file *f) |
1301 | { | |
1302 | return f->f_inode; | |
1303 | } | |
1304 | ||
d101a125 MS |
1305 | static inline struct dentry *file_dentry(const struct file *file) |
1306 | { | |
fb16043b | 1307 | return d_real(file->f_path.dentry, file_inode(file)); |
d101a125 MS |
1308 | } |
1309 | ||
e55c34a6 BC |
1310 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
1311 | { | |
c568d683 | 1312 | return locks_lock_inode_wait(locks_inode(filp), fl); |
e55c34a6 BC |
1313 | } |
1314 | ||
1da177e4 | 1315 | struct fasync_struct { |
7a107c0f | 1316 | rwlock_t fa_lock; |
989a2979 ED |
1317 | int magic; |
1318 | int fa_fd; | |
1319 | struct fasync_struct *fa_next; /* singly linked list */ | |
1320 | struct file *fa_file; | |
1321 | struct rcu_head fa_rcu; | |
1da177e4 LT |
1322 | }; |
1323 | ||
1324 | #define FASYNC_MAGIC 0x4601 | |
1325 | ||
1326 | /* SMP safe fasync helpers: */ | |
1327 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); | |
f7347ce4 LT |
1328 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1329 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); | |
1330 | extern struct fasync_struct *fasync_alloc(void); | |
1331 | extern void fasync_free(struct fasync_struct *); | |
1332 | ||
1da177e4 LT |
1333 | /* can be called from interrupts */ |
1334 | extern void kill_fasync(struct fasync_struct **, int, int); | |
1da177e4 | 1335 | |
e0b93edd | 1336 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
393cc3f5 | 1337 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1da177e4 | 1338 | extern void f_delown(struct file *filp); |
609d7fa9 | 1339 | extern pid_t f_getown(struct file *filp); |
1da177e4 LT |
1340 | extern int send_sigurg(struct fown_struct *fown); |
1341 | ||
e462ec50 DH |
1342 | /* |
1343 | * sb->s_flags. Note that these mirror the equivalent MS_* flags where | |
1344 | * represented in both. | |
1345 | */ | |
1346 | #define SB_RDONLY 1 /* Mount read-only */ | |
1347 | #define SB_NOSUID 2 /* Ignore suid and sgid bits */ | |
1348 | #define SB_NODEV 4 /* Disallow access to device special files */ | |
1349 | #define SB_NOEXEC 8 /* Disallow program execution */ | |
1350 | #define SB_SYNCHRONOUS 16 /* Writes are synced at once */ | |
1351 | #define SB_MANDLOCK 64 /* Allow mandatory locks on an FS */ | |
1352 | #define SB_DIRSYNC 128 /* Directory modifications are synchronous */ | |
1353 | #define SB_NOATIME 1024 /* Do not update access times. */ | |
1354 | #define SB_NODIRATIME 2048 /* Do not update directory access times */ | |
1355 | #define SB_SILENT 32768 | |
1356 | #define SB_POSIXACL (1<<16) /* VFS does not apply the umask */ | |
1357 | #define SB_KERNMOUNT (1<<22) /* this is a kern_mount call */ | |
1358 | #define SB_I_VERSION (1<<23) /* Update inode I_version field */ | |
1359 | #define SB_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ | |
1360 | ||
1361 | /* These sb flags are internal to the kernel */ | |
1362 | #define SB_SUBMOUNT (1<<26) | |
8d0347f6 | 1363 | #define SB_FORCE (1<<27) |
e462ec50 DH |
1364 | #define SB_NOSEC (1<<28) |
1365 | #define SB_BORN (1<<29) | |
1366 | #define SB_ACTIVE (1<<30) | |
1367 | #define SB_NOUSER (1<<31) | |
1368 | ||
1da177e4 LT |
1369 | /* |
1370 | * Umount options | |
1371 | */ | |
1372 | ||
1373 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ | |
1374 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ | |
1375 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ | |
db1f05bb MS |
1376 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1377 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ | |
1da177e4 | 1378 | |
46b15caa TH |
1379 | /* sb->s_iflags */ |
1380 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ | |
90f8572b | 1381 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
a2982cc9 | 1382 | #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */ |
95dd7758 | 1383 | #define SB_I_MULTIROOT 0x00000008 /* Multiple roots to the dentry tree */ |
1da177e4 | 1384 | |
8654df4e EB |
1385 | /* sb->s_iflags to limit user namespace mounts */ |
1386 | #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */ | |
57b56ac6 MZ |
1387 | #define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020 |
1388 | #define SB_I_UNTRUSTED_MOUNTER 0x00000040 | |
1da177e4 | 1389 | |
5accdf82 JK |
1390 | /* Possible states of 'frozen' field */ |
1391 | enum { | |
1392 | SB_UNFROZEN = 0, /* FS is unfrozen */ | |
1393 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ | |
5accdf82 JK |
1394 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1395 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop | |
1396 | * internal threads if needed) */ | |
1397 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ | |
1398 | }; | |
1399 | ||
1400 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) | |
1401 | ||
1402 | struct sb_writers { | |
8129ed29 ON |
1403 | int frozen; /* Is sb frozen? */ |
1404 | wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ | |
1405 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; | |
5accdf82 JK |
1406 | }; |
1407 | ||
1da177e4 LT |
1408 | struct super_block { |
1409 | struct list_head s_list; /* Keep this first */ | |
1410 | dev_t s_dev; /* search index; _not_ kdev_t */ | |
270ba5f7 RK |
1411 | unsigned char s_blocksize_bits; |
1412 | unsigned long s_blocksize; | |
42cb56ae | 1413 | loff_t s_maxbytes; /* Max file size */ |
1da177e4 | 1414 | struct file_system_type *s_type; |
ee9b6d61 | 1415 | const struct super_operations *s_op; |
61e225dc | 1416 | const struct dquot_operations *dq_op; |
0d54b217 | 1417 | const struct quotactl_ops *s_qcop; |
39655164 | 1418 | const struct export_operations *s_export_op; |
1da177e4 | 1419 | unsigned long s_flags; |
46b15caa | 1420 | unsigned long s_iflags; /* internal SB_I_* flags */ |
1da177e4 LT |
1421 | unsigned long s_magic; |
1422 | struct dentry *s_root; | |
1423 | struct rw_semaphore s_umount; | |
1da177e4 | 1424 | int s_count; |
1da177e4 | 1425 | atomic_t s_active; |
50462062 | 1426 | #ifdef CONFIG_SECURITY |
1da177e4 | 1427 | void *s_security; |
50462062 | 1428 | #endif |
bb435453 | 1429 | const struct xattr_handler **s_xattr; |
643fa961 | 1430 | #ifdef CONFIG_FS_ENCRYPTION |
0b81d077 | 1431 | const struct fscrypt_operations *s_cop; |
bbbc3fb6 | 1432 | #endif |
f1ee6162 | 1433 | struct hlist_bl_head s_roots; /* alternate root dentries for NFS */ |
39f7c4db | 1434 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1da177e4 | 1435 | struct block_device *s_bdev; |
32a88aa1 | 1436 | struct backing_dev_info *s_bdi; |
acaebfd8 | 1437 | struct mtd_info *s_mtd; |
a5166169 | 1438 | struct hlist_node s_instances; |
2c5f648a | 1439 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
1da177e4 LT |
1440 | struct quota_info s_dquot; /* Diskquota specific options */ |
1441 | ||
5accdf82 | 1442 | struct sb_writers s_writers; |
1da177e4 | 1443 | |
99c228a9 AG |
1444 | /* |
1445 | * Keep s_fs_info, s_time_gran, s_fsnotify_mask, and | |
1446 | * s_fsnotify_marks together for cache efficiency. They are frequently | |
1447 | * accessed and rarely modified. | |
1448 | */ | |
1449 | void *s_fs_info; /* Filesystem private info */ | |
1450 | ||
1451 | /* Granularity of c/m/atime in ns (cannot be worse than a second) */ | |
1452 | u32 s_time_gran; | |
1453 | #ifdef CONFIG_FSNOTIFY | |
1454 | __u32 s_fsnotify_mask; | |
1455 | struct fsnotify_mark_connector __rcu *s_fsnotify_marks; | |
1456 | #endif | |
1457 | ||
85787090 CH |
1458 | char s_id[32]; /* Informational name */ |
1459 | uuid_t s_uuid; /* UUID */ | |
1da177e4 | 1460 | |
8de52778 | 1461 | unsigned int s_max_links; |
30c40d2c | 1462 | fmode_t s_mode; |
1da177e4 LT |
1463 | |
1464 | /* | |
1465 | * The next field is for VFS *only*. No filesystems have any business | |
1466 | * even looking at it. You had been warned. | |
1467 | */ | |
a11f3a05 | 1468 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1da177e4 | 1469 | |
79c0b2df MS |
1470 | /* |
1471 | * Filesystem subtype. If non-empty the filesystem type field | |
1472 | * in /proc/mounts will be "type.subtype" | |
1473 | */ | |
a0c9a8b8 | 1474 | const char *s_subtype; |
b3b304a2 | 1475 | |
c8aebb0c | 1476 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
9fdfdcf1 DM |
1477 | |
1478 | /* | |
1479 | * Saved pool identifier for cleancache (-1 means none) | |
1480 | */ | |
1481 | int cleancache_poolid; | |
b0d40c92 DC |
1482 | |
1483 | struct shrinker s_shrink; /* per-sb shrinker handle */ | |
4ed5e82f | 1484 | |
7ada4db8 MS |
1485 | /* Number of inodes with nlink == 0 but still referenced */ |
1486 | atomic_long_t s_remove_count; | |
1487 | ||
721fb6fb JK |
1488 | /* Pending fsnotify inode refs */ |
1489 | atomic_long_t s_fsnotify_inode_refs; | |
1490 | ||
4ed5e82f MS |
1491 | /* Being remounted read-only */ |
1492 | int s_readonly_remount; | |
7b7a8665 CH |
1493 | |
1494 | /* AIO completions deferred from interrupt context */ | |
1495 | struct workqueue_struct *s_dio_done_wq; | |
215752fc | 1496 | struct hlist_head s_pins; |
f6041567 | 1497 | |
6e4eab57 EB |
1498 | /* |
1499 | * Owning user namespace and default context in which to | |
1500 | * interpret filesystem uids, gids, quotas, device nodes, | |
1501 | * xattrs and security labels. | |
1502 | */ | |
1503 | struct user_namespace *s_user_ns; | |
1504 | ||
f6041567 | 1505 | /* |
7d10f70f WL |
1506 | * The list_lru structure is essentially just a pointer to a table |
1507 | * of per-node lru lists, each of which has its own spinlock. | |
1508 | * There is no need to put them into separate cachelines. | |
f6041567 | 1509 | */ |
7d10f70f WL |
1510 | struct list_lru s_dentry_lru; |
1511 | struct list_lru s_inode_lru; | |
e2fec7c3 | 1512 | struct rcu_head rcu; |
853b39a7 | 1513 | struct work_struct destroy_work; |
69c433ed | 1514 | |
e97fedb9 | 1515 | struct mutex s_sync_lock; /* sync serialisation lock */ |
69c433ed MS |
1516 | |
1517 | /* | |
1518 | * Indicates how deep in a filesystem stack this SB is | |
1519 | */ | |
1520 | int s_stack_depth; | |
74278da9 DC |
1521 | |
1522 | /* s_inode_list_lock protects s_inodes */ | |
1523 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; | |
1524 | struct list_head s_inodes; /* all inodes */ | |
6c60d2b5 DC |
1525 | |
1526 | spinlock_t s_inode_wblist_lock; | |
1527 | struct list_head s_inodes_wb; /* writeback inodes */ | |
3859a271 | 1528 | } __randomize_layout; |
1da177e4 | 1529 | |
81754357 SF |
1530 | /* Helper functions so that in most cases filesystems will |
1531 | * not need to deal directly with kuid_t and kgid_t and can | |
1532 | * instead deal with the raw numeric values that are stored | |
1533 | * in the filesystem. | |
1534 | */ | |
1535 | static inline uid_t i_uid_read(const struct inode *inode) | |
1536 | { | |
1537 | return from_kuid(inode->i_sb->s_user_ns, inode->i_uid); | |
1538 | } | |
1539 | ||
1540 | static inline gid_t i_gid_read(const struct inode *inode) | |
1541 | { | |
1542 | return from_kgid(inode->i_sb->s_user_ns, inode->i_gid); | |
1543 | } | |
1544 | ||
1545 | static inline void i_uid_write(struct inode *inode, uid_t uid) | |
1546 | { | |
1547 | inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid); | |
1548 | } | |
1549 | ||
1550 | static inline void i_gid_write(struct inode *inode, gid_t gid) | |
1551 | { | |
1552 | inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid); | |
1553 | } | |
1554 | ||
8efd6894 | 1555 | extern struct timespec64 timespec64_trunc(struct timespec64 t, unsigned gran); |
95582b00 | 1556 | extern struct timespec64 current_time(struct inode *inode); |
1da177e4 LT |
1557 | |
1558 | /* | |
1559 | * Snapshotting support. | |
1560 | */ | |
1da177e4 | 1561 | |
5accdf82 JK |
1562 | void __sb_end_write(struct super_block *sb, int level); |
1563 | int __sb_start_write(struct super_block *sb, int level, bool wait); | |
1564 | ||
bee9182d | 1565 | #define __sb_writers_acquired(sb, lev) \ |
8129ed29 | 1566 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1567 | #define __sb_writers_release(sb, lev) \ |
8129ed29 | 1568 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
bee9182d | 1569 | |
5accdf82 JK |
1570 | /** |
1571 | * sb_end_write - drop write access to a superblock | |
1572 | * @sb: the super we wrote to | |
1573 | * | |
1574 | * Decrement number of writers to the filesystem. Wake up possible waiters | |
1575 | * wanting to freeze the filesystem. | |
1576 | */ | |
1577 | static inline void sb_end_write(struct super_block *sb) | |
1578 | { | |
1579 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1580 | } | |
1581 | ||
1582 | /** | |
1583 | * sb_end_pagefault - drop write access to a superblock from a page fault | |
1584 | * @sb: the super we wrote to | |
1585 | * | |
1586 | * Decrement number of processes handling write page fault to the filesystem. | |
1587 | * Wake up possible waiters wanting to freeze the filesystem. | |
1588 | */ | |
1589 | static inline void sb_end_pagefault(struct super_block *sb) | |
1590 | { | |
1591 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); | |
1592 | } | |
1593 | ||
1594 | /** | |
1595 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes | |
1596 | * @sb: the super we wrote to | |
1597 | * | |
1598 | * Decrement fs-internal number of writers to the filesystem. Wake up possible | |
1599 | * waiters wanting to freeze the filesystem. | |
1600 | */ | |
1601 | static inline void sb_end_intwrite(struct super_block *sb) | |
1602 | { | |
1603 | __sb_end_write(sb, SB_FREEZE_FS); | |
1604 | } | |
1605 | ||
1606 | /** | |
1607 | * sb_start_write - get write access to a superblock | |
1608 | * @sb: the super we write to | |
1609 | * | |
1610 | * When a process wants to write data or metadata to a file system (i.e. dirty | |
1611 | * a page or an inode), it should embed the operation in a sb_start_write() - | |
1612 | * sb_end_write() pair to get exclusion against file system freezing. This | |
1613 | * function increments number of writers preventing freezing. If the file | |
1614 | * system is already frozen, the function waits until the file system is | |
1615 | * thawed. | |
1616 | * | |
1617 | * Since freeze protection behaves as a lock, users have to preserve | |
1618 | * ordering of freeze protection and other filesystem locks. Generally, | |
1619 | * freeze protection should be the outermost lock. In particular, we have: | |
1620 | * | |
1621 | * sb_start_write | |
1622 | * -> i_mutex (write path, truncate, directory ops, ...) | |
1623 | * -> s_umount (freeze_super, thaw_super) | |
1624 | */ | |
1625 | static inline void sb_start_write(struct super_block *sb) | |
1626 | { | |
1627 | __sb_start_write(sb, SB_FREEZE_WRITE, true); | |
1628 | } | |
1629 | ||
1630 | static inline int sb_start_write_trylock(struct super_block *sb) | |
1631 | { | |
1632 | return __sb_start_write(sb, SB_FREEZE_WRITE, false); | |
1633 | } | |
1634 | ||
1635 | /** | |
1636 | * sb_start_pagefault - get write access to a superblock from a page fault | |
1637 | * @sb: the super we write to | |
1638 | * | |
1639 | * When a process starts handling write page fault, it should embed the | |
1640 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get | |
1641 | * exclusion against file system freezing. This is needed since the page fault | |
1642 | * is going to dirty a page. This function increments number of running page | |
1643 | * faults preventing freezing. If the file system is already frozen, the | |
1644 | * function waits until the file system is thawed. | |
1645 | * | |
1646 | * Since page fault freeze protection behaves as a lock, users have to preserve | |
1647 | * ordering of freeze protection and other filesystem locks. It is advised to | |
1648 | * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault | |
1649 | * handling code implies lock dependency: | |
1650 | * | |
1651 | * mmap_sem | |
1652 | * -> sb_start_pagefault | |
1653 | */ | |
1654 | static inline void sb_start_pagefault(struct super_block *sb) | |
1655 | { | |
1656 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); | |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * sb_start_intwrite - get write access to a superblock for internal fs purposes | |
1661 | * @sb: the super we write to | |
1662 | * | |
1663 | * This is the third level of protection against filesystem freezing. It is | |
1664 | * free for use by a filesystem. The only requirement is that it must rank | |
1665 | * below sb_start_pagefault. | |
1666 | * | |
1667 | * For example filesystem can call sb_start_intwrite() when starting a | |
1668 | * transaction which somewhat eases handling of freezing for internal sources | |
1669 | * of filesystem changes (internal fs threads, discarding preallocation on file | |
1670 | * close, etc.). | |
1671 | */ | |
1672 | static inline void sb_start_intwrite(struct super_block *sb) | |
1673 | { | |
1674 | __sb_start_write(sb, SB_FREEZE_FS, true); | |
1675 | } | |
1da177e4 | 1676 | |
0c8e3fe3 AG |
1677 | static inline int sb_start_intwrite_trylock(struct super_block *sb) |
1678 | { | |
1679 | return __sb_start_write(sb, SB_FREEZE_FS, false); | |
1680 | } | |
1681 | ||
1da177e4 | 1682 | |
2e149670 | 1683 | extern bool inode_owner_or_capable(const struct inode *inode); |
3bd858ab | 1684 | |
1da177e4 LT |
1685 | /* |
1686 | * VFS helper functions.. | |
1687 | */ | |
312b63fb | 1688 | extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 1689 | extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); |
1a67aafb | 1690 | extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
db2e747b | 1691 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
146a8595 | 1692 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); |
1da177e4 | 1693 | extern int vfs_rmdir(struct inode *, struct dentry *); |
b21996e3 | 1694 | extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); |
520c8b16 | 1695 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); |
787fb6bc | 1696 | extern int vfs_whiteout(struct inode *, struct dentry *); |
1da177e4 | 1697 | |
af7bd4dc AG |
1698 | extern struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, |
1699 | int open_flag); | |
1700 | ||
8e6c848e AV |
1701 | int vfs_mkobj(struct dentry *, umode_t, |
1702 | int (*f)(struct dentry *, umode_t, void *), | |
1703 | void *); | |
1704 | ||
9df6702a MS |
1705 | extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
1706 | ||
8c744fb8 CH |
1707 | /* |
1708 | * VFS file helper functions. | |
1709 | */ | |
a1bd120d | 1710 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb1091 | 1711 | umode_t mode); |
a2982cc9 | 1712 | extern bool may_open_dev(const struct path *path); |
c4b929b8 MF |
1713 | /* |
1714 | * VFS FS_IOC_FIEMAP helper definitions. | |
1715 | */ | |
1716 | struct fiemap_extent_info { | |
1717 | unsigned int fi_flags; /* Flags as passed from user */ | |
1718 | unsigned int fi_extents_mapped; /* Number of mapped extents */ | |
1719 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ | |
ecf5632d NK |
1720 | struct fiemap_extent __user *fi_extents_start; /* Start of |
1721 | fiemap_extent array */ | |
c4b929b8 MF |
1722 | }; |
1723 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, | |
1724 | u64 phys, u64 len, u32 flags); | |
1725 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); | |
1726 | ||
1da177e4 LT |
1727 | /* |
1728 | * This is the "filldir" function type, used by readdir() to let | |
1729 | * the kernel specify what kind of dirent layout it wants to have. | |
1730 | * This allows the kernel to read directories into kernel space or | |
1731 | * to have different dirent layouts depending on the binary type. | |
1732 | */ | |
ac7576f4 MS |
1733 | struct dir_context; |
1734 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, | |
1735 | unsigned); | |
1736 | ||
5c0ba4e0 | 1737 | struct dir_context { |
a09acf4b | 1738 | filldir_t actor; |
bb6f619b | 1739 | loff_t pos; |
5c0ba4e0 | 1740 | }; |
bb6f619b | 1741 | |
08f85851 | 1742 | struct block_device_operations; |
1da177e4 | 1743 | |
1da177e4 LT |
1744 | /* These macros are for out of kernel modules to test that |
1745 | * the kernel supports the unlocked_ioctl and compat_ioctl | |
1746 | * fields in struct file_operations. */ | |
1747 | #define HAVE_COMPAT_IOCTL 1 | |
1748 | #define HAVE_UNLOCKED_IOCTL 1 | |
1749 | ||
b4caecd4 CH |
1750 | /* |
1751 | * These flags let !MMU mmap() govern direct device mapping vs immediate | |
1752 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. | |
1753 | * | |
1754 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) | |
1755 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) | |
1756 | * NOMMU_MAP_READ: Can be mapped for reading | |
1757 | * NOMMU_MAP_WRITE: Can be mapped for writing | |
1758 | * NOMMU_MAP_EXEC: Can be mapped for execution | |
1759 | */ | |
1760 | #define NOMMU_MAP_COPY 0x00000001 | |
1761 | #define NOMMU_MAP_DIRECT 0x00000008 | |
1762 | #define NOMMU_MAP_READ VM_MAYREAD | |
1763 | #define NOMMU_MAP_WRITE VM_MAYWRITE | |
1764 | #define NOMMU_MAP_EXEC VM_MAYEXEC | |
1765 | ||
1766 | #define NOMMU_VMFLAGS \ | |
1767 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) | |
1768 | ||
2e5dfc99 DW |
1769 | /* |
1770 | * These flags control the behavior of the remap_file_range function pointer. | |
1771 | * If it is called with len == 0 that means "remap to end of source file". | |
1772 | * See Documentation/filesystems/vfs.txt for more details about this call. | |
1773 | * | |
1774 | * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate) | |
eca3654e | 1775 | * REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request |
2e5dfc99 DW |
1776 | */ |
1777 | #define REMAP_FILE_DEDUP (1 << 0) | |
eca3654e | 1778 | #define REMAP_FILE_CAN_SHORTEN (1 << 1) |
2e5dfc99 DW |
1779 | |
1780 | /* | |
1781 | * These flags signal that the caller is ok with altering various aspects of | |
1782 | * the behavior of the remap operation. The changes must be made by the | |
1783 | * implementation; the vfs remap helper functions can take advantage of them. | |
1784 | * Flags in this category exist to preserve the quirky behavior of the hoisted | |
1785 | * btrfs clone/dedupe ioctls. | |
2e5dfc99 | 1786 | */ |
eca3654e | 1787 | #define REMAP_FILE_ADVISORY (REMAP_FILE_CAN_SHORTEN) |
b4caecd4 | 1788 | |
293bc982 AV |
1789 | struct iov_iter; |
1790 | ||
1da177e4 LT |
1791 | struct file_operations { |
1792 | struct module *owner; | |
1793 | loff_t (*llseek) (struct file *, loff_t, int); | |
1794 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); | |
1da177e4 | 1795 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
293bc982 AV |
1796 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
1797 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); | |
fb7e1600 | 1798 | int (*iopoll)(struct kiocb *kiocb, bool spin); |
bb6f619b | 1799 | int (*iterate) (struct file *, struct dir_context *); |
61922694 | 1800 | int (*iterate_shared) (struct file *, struct dir_context *); |
a3f8683b | 1801 | __poll_t (*poll) (struct file *, struct poll_table_struct *); |
1da177e4 LT |
1802 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
1803 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); | |
1804 | int (*mmap) (struct file *, struct vm_area_struct *); | |
1c972597 | 1805 | unsigned long mmap_supported_flags; |
1da177e4 | 1806 | int (*open) (struct inode *, struct file *); |
75e1fcc0 | 1807 | int (*flush) (struct file *, fl_owner_t id); |
1da177e4 | 1808 | int (*release) (struct inode *, struct file *); |
02c24a82 | 1809 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
1da177e4 LT |
1810 | int (*fasync) (int, struct file *, int); |
1811 | int (*lock) (struct file *, int, struct file_lock *); | |
1da177e4 LT |
1812 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
1813 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1814 | int (*check_flags)(int); | |
1da177e4 | 1815 | int (*flock) (struct file *, int, struct file_lock *); |
cbb7e577 JA |
1816 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
1817 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
e6f5c789 | 1818 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
2fe17c10 CH |
1819 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
1820 | loff_t len); | |
a3816ab0 | 1821 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
b4caecd4 CH |
1822 | #ifndef CONFIG_MMU |
1823 | unsigned (*mmap_capabilities)(struct file *); | |
1824 | #endif | |
04b38d60 CH |
1825 | ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, |
1826 | loff_t, size_t, unsigned int); | |
42ec3d4c DW |
1827 | loff_t (*remap_file_range)(struct file *file_in, loff_t pos_in, |
1828 | struct file *file_out, loff_t pos_out, | |
1829 | loff_t len, unsigned int remap_flags); | |
45cd0faa | 1830 | int (*fadvise)(struct file *, loff_t, loff_t, int); |
3859a271 | 1831 | } __randomize_layout; |
1da177e4 LT |
1832 | |
1833 | struct inode_operations { | |
00cd8dd3 | 1834 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
fceef393 | 1835 | const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); |
10556cb2 | 1836 | int (*permission) (struct inode *, int); |
4e34e719 | 1837 | struct posix_acl * (*get_acl)(struct inode *, int); |
44a7d7a8 NP |
1838 | |
1839 | int (*readlink) (struct dentry *, char __user *,int); | |
44a7d7a8 | 1840 | |
ebfc3b49 | 1841 | int (*create) (struct inode *,struct dentry *, umode_t, bool); |
1da177e4 LT |
1842 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
1843 | int (*unlink) (struct inode *,struct dentry *); | |
1844 | int (*symlink) (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 1845 | int (*mkdir) (struct inode *,struct dentry *,umode_t); |
1da177e4 | 1846 | int (*rmdir) (struct inode *,struct dentry *); |
1a67aafb | 1847 | int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 1848 | int (*rename) (struct inode *, struct dentry *, |
520c8b16 | 1849 | struct inode *, struct dentry *, unsigned int); |
1da177e4 | 1850 | int (*setattr) (struct dentry *, struct iattr *); |
a528d35e | 1851 | int (*getattr) (const struct path *, struct kstat *, u32, unsigned int); |
1da177e4 | 1852 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
c4b929b8 MF |
1853 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
1854 | u64 len); | |
95582b00 | 1855 | int (*update_time)(struct inode *, struct timespec64 *, int); |
d9585277 | 1856 | int (*atomic_open)(struct inode *, struct dentry *, |
30d90494 | 1857 | struct file *, unsigned open_flag, |
44907d79 | 1858 | umode_t create_mode); |
60545d0d | 1859 | int (*tmpfile) (struct inode *, struct dentry *, umode_t); |
893d46e4 | 1860 | int (*set_acl)(struct inode *, struct posix_acl *, int); |
44a7d7a8 | 1861 | } ____cacheline_aligned; |
1da177e4 | 1862 | |
bb7462b6 MS |
1863 | static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio, |
1864 | struct iov_iter *iter) | |
1865 | { | |
1866 | return file->f_op->read_iter(kio, iter); | |
1867 | } | |
1868 | ||
1869 | static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio, | |
1870 | struct iov_iter *iter) | |
1871 | { | |
1872 | return file->f_op->write_iter(kio, iter); | |
1873 | } | |
1874 | ||
f74ac015 MS |
1875 | static inline int call_mmap(struct file *file, struct vm_area_struct *vma) |
1876 | { | |
1877 | return file->f_op->mmap(file, vma); | |
1878 | } | |
1879 | ||
eed4e51f | 1880 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
fcf63409 CY |
1881 | unsigned long nr_segs, unsigned long fast_segs, |
1882 | struct iovec *fast_pointer, | |
ac34ebb3 | 1883 | struct iovec **ret_pointer); |
eed4e51f | 1884 | |
6fb5032e | 1885 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); |
1da177e4 LT |
1886 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
1887 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); | |
1888 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, | |
ddef7ed2 | 1889 | unsigned long, loff_t *, rwf_t); |
29732938 ZB |
1890 | extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, |
1891 | loff_t, size_t, unsigned int); | |
a83ab01a DW |
1892 | extern int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, |
1893 | struct file *file_out, loff_t pos_out, | |
42ec3d4c DW |
1894 | loff_t *count, |
1895 | unsigned int remap_flags); | |
1896 | extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, | |
1897 | struct file *file_out, loff_t pos_out, | |
452ce659 | 1898 | loff_t len, unsigned int remap_flags); |
42ec3d4c DW |
1899 | extern loff_t vfs_clone_file_range(struct file *file_in, loff_t pos_in, |
1900 | struct file *file_out, loff_t pos_out, | |
452ce659 | 1901 | loff_t len, unsigned int remap_flags); |
54dbc151 DW |
1902 | extern int vfs_dedupe_file_range(struct file *file, |
1903 | struct file_dedupe_range *same); | |
42ec3d4c DW |
1904 | extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, |
1905 | struct file *dst_file, loff_t dst_pos, | |
df365836 | 1906 | loff_t len, unsigned int remap_flags); |
f1825366 | 1907 | |
1da177e4 | 1908 | |
1da177e4 LT |
1909 | struct super_operations { |
1910 | struct inode *(*alloc_inode)(struct super_block *sb); | |
1911 | void (*destroy_inode)(struct inode *); | |
fdb0da89 | 1912 | void (*free_inode)(struct inode *); |
1da177e4 | 1913 | |
aa385729 | 1914 | void (*dirty_inode) (struct inode *, int flags); |
a9185b41 | 1915 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
45321ac5 | 1916 | int (*drop_inode) (struct inode *); |
be7ce416 | 1917 | void (*evict_inode) (struct inode *); |
1da177e4 | 1918 | void (*put_super) (struct super_block *); |
1da177e4 | 1919 | int (*sync_fs)(struct super_block *sb, int wait); |
48b6bca6 | 1920 | int (*freeze_super) (struct super_block *); |
c4be0c1d | 1921 | int (*freeze_fs) (struct super_block *); |
48b6bca6 | 1922 | int (*thaw_super) (struct super_block *); |
c4be0c1d | 1923 | int (*unfreeze_fs) (struct super_block *); |
726c3342 | 1924 | int (*statfs) (struct dentry *, struct kstatfs *); |
1da177e4 | 1925 | int (*remount_fs) (struct super_block *, int *, char *); |
42faad99 | 1926 | void (*umount_begin) (struct super_block *); |
1da177e4 | 1927 | |
34c80b1d | 1928 | int (*show_options)(struct seq_file *, struct dentry *); |
d861c630 | 1929 | int (*show_devname)(struct seq_file *, struct dentry *); |
a6322de6 | 1930 | int (*show_path)(struct seq_file *, struct dentry *); |
64132379 | 1931 | int (*show_stats)(struct seq_file *, struct dentry *); |
0e51a720 | 1932 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
1933 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
1934 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); | |
2d0fa467 | 1935 | struct dquot **(*get_dquots)(struct inode *); |
0e51a720 | 1936 | #endif |
87d8fe1e | 1937 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
4101b624 VD |
1938 | long (*nr_cached_objects)(struct super_block *, |
1939 | struct shrink_control *); | |
1940 | long (*free_cached_objects)(struct super_block *, | |
1941 | struct shrink_control *); | |
1da177e4 LT |
1942 | }; |
1943 | ||
bbc1096a DH |
1944 | /* |
1945 | * Inode flags - they have no relation to superblock flags now | |
1946 | */ | |
1947 | #define S_SYNC 1 /* Writes are synced at once */ | |
1948 | #define S_NOATIME 2 /* Do not update access times */ | |
1949 | #define S_APPEND 4 /* Append-only file */ | |
1950 | #define S_IMMUTABLE 8 /* Immutable file */ | |
1951 | #define S_DEAD 16 /* removed, but still open directory */ | |
1952 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ | |
1953 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ | |
1954 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ | |
1955 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ | |
1956 | #define S_PRIVATE 512 /* Inode is fs-internal */ | |
1957 | #define S_IMA 1024 /* Inode has an associated IMA struct */ | |
1958 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ | |
1959 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ | |
6cd176a5 | 1960 | #ifdef CONFIG_FS_DAX |
fbbbad4b MW |
1961 | #define S_DAX 8192 /* Direct Access, avoiding the page cache */ |
1962 | #else | |
1963 | #define S_DAX 0 /* Make all the DAX code disappear */ | |
1964 | #endif | |
2ee6a576 | 1965 | #define S_ENCRYPTED 16384 /* Encrypted file (using fs/crypto/) */ |
b886ee3e | 1966 | #define S_CASEFOLD 32768 /* Casefolded file */ |
bbc1096a DH |
1967 | |
1968 | /* | |
1969 | * Note that nosuid etc flags are inode-specific: setting some file-system | |
1970 | * flags just means all the inodes inherit those flags by default. It might be | |
1971 | * possible to override it selectively if you really wanted to with some | |
1972 | * ioctl() that is not currently implemented. | |
1973 | * | |
e462ec50 | 1974 | * Exception: SB_RDONLY is always applied to the entire file system. |
bbc1096a DH |
1975 | * |
1976 | * Unfortunately, it is possible to change a filesystems flags with it mounted | |
1977 | * with files in use. This means that all of the inodes will not have their | |
1978 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount | |
1979 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org | |
1980 | */ | |
1981 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) | |
1982 | ||
1751e8a6 | 1983 | static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & SB_RDONLY; } |
94e92e7a | 1984 | #define IS_RDONLY(inode) sb_rdonly((inode)->i_sb) |
e462ec50 | 1985 | #define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \ |
bbc1096a | 1986 | ((inode)->i_flags & S_SYNC)) |
e462ec50 | 1987 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \ |
bbc1096a | 1988 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
e462ec50 DH |
1989 | #define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK) |
1990 | #define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME) | |
1991 | #define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION) | |
bbc1096a DH |
1992 | |
1993 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) | |
1994 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) | |
1995 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) | |
e462ec50 | 1996 | #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL) |
bbc1096a DH |
1997 | |
1998 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) | |
1999 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) | |
2000 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) | |
2001 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) | |
2002 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) | |
2003 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) | |
2004 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) | |
fbbbad4b | 2005 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
2ee6a576 | 2006 | #define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED) |
b886ee3e | 2007 | #define IS_CASEFOLDED(inode) ((inode)->i_flags & S_CASEFOLD) |
bbc1096a | 2008 | |
787fb6bc MS |
2009 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
2010 | (inode)->i_rdev == WHITEOUT_DEV) | |
2011 | ||
0bd23d09 EB |
2012 | static inline bool HAS_UNMAPPED_ID(struct inode *inode) |
2013 | { | |
2014 | return !uid_valid(inode->i_uid) || !gid_valid(inode->i_gid); | |
2015 | } | |
2016 | ||
c75b1d94 JA |
2017 | static inline enum rw_hint file_write_hint(struct file *file) |
2018 | { | |
2019 | if (file->f_write_hint != WRITE_LIFE_NOT_SET) | |
2020 | return file->f_write_hint; | |
2021 | ||
2022 | return file_inode(file)->i_write_hint; | |
2023 | } | |
2024 | ||
2025 | static inline int iocb_flags(struct file *file); | |
2026 | ||
fc28724d AM |
2027 | static inline u16 ki_hint_validate(enum rw_hint hint) |
2028 | { | |
2029 | typeof(((struct kiocb *)0)->ki_hint) max_hint = -1; | |
2030 | ||
2031 | if (hint <= max_hint) | |
2032 | return hint; | |
2033 | return 0; | |
2034 | } | |
2035 | ||
c75b1d94 JA |
2036 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) |
2037 | { | |
2038 | *kiocb = (struct kiocb) { | |
2039 | .ki_filp = filp, | |
2040 | .ki_flags = iocb_flags(filp), | |
fc28724d | 2041 | .ki_hint = ki_hint_validate(file_write_hint(filp)), |
20578bdf | 2042 | .ki_ioprio = get_current_ioprio(), |
c75b1d94 JA |
2043 | }; |
2044 | } | |
2045 | ||
1c0eeaf5 | 2046 | /* |
250df6ed | 2047 | * Inode state bits. Protected by inode->i_lock |
1c0eeaf5 JE |
2048 | * |
2049 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, | |
2050 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. | |
2051 | * | |
2052 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, | |
2053 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at | |
2054 | * various stages of removing an inode. | |
2055 | * | |
eaff8079 | 2056 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
1c0eeaf5 | 2057 | * |
e7ca2d41 JE |
2058 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
2059 | * fdatasync(). i_atime is the usual cause. | |
000cb48e JK |
2060 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
2061 | * these changes separately from I_DIRTY_SYNC so that we | |
2062 | * don't have to write inode on fdatasync() when only | |
2063 | * mtime has changed in it. | |
1c0eeaf5 | 2064 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
eaff8079 CH |
2065 | * I_NEW Serves as both a mutex and completion notification. |
2066 | * New inodes set I_NEW. If two processes both create | |
2067 | * the same inode, one of them will release its inode and | |
2068 | * wait for I_NEW to be released before returning. | |
2069 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can | |
2070 | * also cause waiting on I_NEW, without I_NEW actually | |
2071 | * being set. find_inode() uses this to prevent returning | |
2072 | * nearly-dead inodes. | |
1c0eeaf5 JE |
2073 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
2074 | * is zero. I_FREEING must be set when I_WILL_FREE is | |
2075 | * cleared. | |
2076 | * I_FREEING Set when inode is about to be freed but still has dirty | |
2077 | * pages or buffers attached or the inode itself is still | |
2078 | * dirty. | |
dbd5768f JK |
2079 | * I_CLEAR Added by clear_inode(). In this state the inode is |
2080 | * clean and can be destroyed. Inode keeps I_FREEING. | |
1c0eeaf5 JE |
2081 | * |
2082 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are | |
2083 | * prohibited for many purposes. iget() must wait for | |
2084 | * the inode to be completely released, then create it | |
2085 | * anew. Other functions will just ignore such inodes, | |
eaff8079 | 2086 | * if appropriate. I_NEW is used for waiting. |
1c0eeaf5 | 2087 | * |
169ebd90 JK |
2088 | * I_SYNC Writeback of inode is running. The bit is set during |
2089 | * data writeback, and cleared with a wakeup on the bit | |
2090 | * address once it is done. The bit is also used to pin | |
2091 | * the inode in memory for flusher thread. | |
1c0eeaf5 | 2092 | * |
bd5fe6c5 CH |
2093 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
2094 | * | |
2095 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). | |
2096 | * | |
682aa8e1 TH |
2097 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
2098 | * synchronize competing switching instances and to tell | |
b93b0163 | 2099 | * wb stat updates to grab the i_pages lock. See |
a9519def | 2100 | * inode_switch_wbs_work_fn() for details. |
682aa8e1 | 2101 | * |
ad0af710 AG |
2102 | * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper |
2103 | * and work dirs among overlayfs mounts. | |
2104 | * | |
c2b6d621 AV |
2105 | * I_CREATING New object's inode in the middle of setting up. |
2106 | * | |
1c0eeaf5 | 2107 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
1c0eeaf5 | 2108 | */ |
9e38d86f NP |
2109 | #define I_DIRTY_SYNC (1 << 0) |
2110 | #define I_DIRTY_DATASYNC (1 << 1) | |
2111 | #define I_DIRTY_PAGES (1 << 2) | |
eaff8079 CH |
2112 | #define __I_NEW 3 |
2113 | #define I_NEW (1 << __I_NEW) | |
9e38d86f NP |
2114 | #define I_WILL_FREE (1 << 4) |
2115 | #define I_FREEING (1 << 5) | |
2116 | #define I_CLEAR (1 << 6) | |
eaff8079 | 2117 | #define __I_SYNC 7 |
1c0eeaf5 | 2118 | #define I_SYNC (1 << __I_SYNC) |
9e38d86f | 2119 | #define I_REFERENCED (1 << 8) |
bd5fe6c5 | 2120 | #define __I_DIO_WAKEUP 9 |
ac74d8d6 | 2121 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
f4e0c30c | 2122 | #define I_LINKABLE (1 << 10) |
0ae45f63 TT |
2123 | #define I_DIRTY_TIME (1 << 11) |
2124 | #define __I_DIRTY_TIME_EXPIRED 12 | |
2125 | #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) | |
682aa8e1 | 2126 | #define I_WB_SWITCH (1 << 13) |
c2b6d621 AV |
2127 | #define I_OVL_INUSE (1 << 14) |
2128 | #define I_CREATING (1 << 15) | |
1da177e4 | 2129 | |
0e11f644 CH |
2130 | #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC) |
2131 | #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES) | |
0ae45f63 | 2132 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
1da177e4 LT |
2133 | |
2134 | extern void __mark_inode_dirty(struct inode *, int); | |
2135 | static inline void mark_inode_dirty(struct inode *inode) | |
2136 | { | |
2137 | __mark_inode_dirty(inode, I_DIRTY); | |
2138 | } | |
2139 | ||
2140 | static inline void mark_inode_dirty_sync(struct inode *inode) | |
2141 | { | |
2142 | __mark_inode_dirty(inode, I_DIRTY_SYNC); | |
2143 | } | |
2144 | ||
7ada4db8 MS |
2145 | extern void inc_nlink(struct inode *inode); |
2146 | extern void drop_nlink(struct inode *inode); | |
2147 | extern void clear_nlink(struct inode *inode); | |
2148 | extern void set_nlink(struct inode *inode, unsigned int nlink); | |
d8c76e6f DH |
2149 | |
2150 | static inline void inode_inc_link_count(struct inode *inode) | |
2151 | { | |
2152 | inc_nlink(inode); | |
66d21730 AD |
2153 | mark_inode_dirty(inode); |
2154 | } | |
2155 | ||
9a53c3a7 DH |
2156 | static inline void inode_dec_link_count(struct inode *inode) |
2157 | { | |
2158 | drop_nlink(inode); | |
66d21730 AD |
2159 | mark_inode_dirty(inode); |
2160 | } | |
2161 | ||
c3b2da31 JB |
2162 | enum file_time_flags { |
2163 | S_ATIME = 1, | |
2164 | S_MTIME = 2, | |
2165 | S_CTIME = 4, | |
2166 | S_VERSION = 8, | |
2167 | }; | |
2168 | ||
c6718543 | 2169 | extern bool atime_needs_update(const struct path *, struct inode *); |
badcf2b7 | 2170 | extern void touch_atime(const struct path *); |
1da177e4 LT |
2171 | static inline void file_accessed(struct file *file) |
2172 | { | |
2173 | if (!(file->f_flags & O_NOATIME)) | |
68ac1234 | 2174 | touch_atime(&file->f_path); |
1da177e4 LT |
2175 | } |
2176 | ||
2177 | int sync_inode(struct inode *inode, struct writeback_control *wbc); | |
c3765016 | 2178 | int sync_inode_metadata(struct inode *inode, int wait); |
1da177e4 | 2179 | |
1da177e4 LT |
2180 | struct file_system_type { |
2181 | const char *name; | |
2182 | int fs_flags; | |
bbc1096a DH |
2183 | #define FS_REQUIRES_DEV 1 |
2184 | #define FS_BINARY_MOUNTDATA 2 | |
2185 | #define FS_HAS_SUBTYPE 4 | |
0c55cfc4 | 2186 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
bbc1096a | 2187 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
f3a09c92 | 2188 | int (*init_fs_context)(struct fs_context *); |
3e1aeb00 | 2189 | const struct fs_parameter_description *parameters; |
c96e41e9 AV |
2190 | struct dentry *(*mount) (struct file_system_type *, int, |
2191 | const char *, void *); | |
1da177e4 LT |
2192 | void (*kill_sb) (struct super_block *); |
2193 | struct module *owner; | |
2194 | struct file_system_type * next; | |
a5166169 | 2195 | struct hlist_head fs_supers; |
d475fd42 | 2196 | |
cf516249 | 2197 | struct lock_class_key s_lock_key; |
897c6ff9 | 2198 | struct lock_class_key s_umount_key; |
51ee049e | 2199 | struct lock_class_key s_vfs_rename_key; |
5accdf82 | 2200 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
d475fd42 PZ |
2201 | |
2202 | struct lock_class_key i_lock_key; | |
2203 | struct lock_class_key i_mutex_key; | |
14358e6d | 2204 | struct lock_class_key i_mutex_dir_key; |
1da177e4 LT |
2205 | }; |
2206 | ||
7f78e035 EB |
2207 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
2208 | ||
d91ee87d EB |
2209 | extern struct dentry *mount_ns(struct file_system_type *fs_type, |
2210 | int flags, void *data, void *ns, struct user_namespace *user_ns, | |
2211 | int (*fill_super)(struct super_block *, void *, int)); | |
f175f307 | 2212 | #ifdef CONFIG_BLOCK |
152a0836 AV |
2213 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2214 | int flags, const char *dev_name, void *data, | |
2215 | int (*fill_super)(struct super_block *, void *, int)); | |
f175f307 AV |
2216 | #else |
2217 | static inline struct dentry *mount_bdev(struct file_system_type *fs_type, | |
2218 | int flags, const char *dev_name, void *data, | |
2219 | int (*fill_super)(struct super_block *, void *, int)) | |
2220 | { | |
2221 | return ERR_PTR(-ENODEV); | |
2222 | } | |
2223 | #endif | |
fc14f2fe AV |
2224 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2225 | int flags, void *data, | |
2226 | int (*fill_super)(struct super_block *, void *, int)); | |
3c26ff6e AV |
2227 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2228 | int flags, void *data, | |
2229 | int (*fill_super)(struct super_block *, void *, int)); | |
ea441d11 | 2230 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
1da177e4 | 2231 | void generic_shutdown_super(struct super_block *sb); |
f175f307 | 2232 | #ifdef CONFIG_BLOCK |
1da177e4 | 2233 | void kill_block_super(struct super_block *sb); |
f175f307 AV |
2234 | #else |
2235 | static inline void kill_block_super(struct super_block *sb) | |
2236 | { | |
2237 | BUG(); | |
2238 | } | |
2239 | #endif | |
1da177e4 LT |
2240 | void kill_anon_super(struct super_block *sb); |
2241 | void kill_litter_super(struct super_block *sb); | |
2242 | void deactivate_super(struct super_block *sb); | |
74dbbdd7 | 2243 | void deactivate_locked_super(struct super_block *sb); |
1da177e4 | 2244 | int set_anon_super(struct super_block *s, void *data); |
cb50b348 | 2245 | int set_anon_super_fc(struct super_block *s, struct fs_context *fc); |
0ee5dc67 AV |
2246 | int get_anon_bdev(dev_t *); |
2247 | void free_anon_bdev(dev_t); | |
cb50b348 AV |
2248 | struct super_block *sget_fc(struct fs_context *fc, |
2249 | int (*test)(struct super_block *, struct fs_context *), | |
2250 | int (*set)(struct super_block *, struct fs_context *)); | |
6e4eab57 EB |
2251 | struct super_block *sget_userns(struct file_system_type *type, |
2252 | int (*test)(struct super_block *,void *), | |
2253 | int (*set)(struct super_block *,void *), | |
2254 | int flags, struct user_namespace *user_ns, | |
2255 | void *data); | |
1da177e4 LT |
2256 | struct super_block *sget(struct file_system_type *type, |
2257 | int (*test)(struct super_block *,void *), | |
2258 | int (*set)(struct super_block *,void *), | |
9249e17f | 2259 | int flags, void *data); |
bba0bd31 AG |
2260 | extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *, |
2261 | const struct super_operations *ops, | |
2262 | const struct xattr_handler **xattr, | |
2263 | const struct dentry_operations *dops, | |
2264 | unsigned long); | |
2265 | ||
2266 | static inline struct dentry * | |
2267 | mount_pseudo(struct file_system_type *fs_type, char *name, | |
2268 | const struct super_operations *ops, | |
2269 | const struct dentry_operations *dops, unsigned long magic) | |
2270 | { | |
2271 | return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic); | |
2272 | } | |
1da177e4 LT |
2273 | |
2274 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ | |
2275 | #define fops_get(fops) \ | |
2276 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) | |
2277 | #define fops_put(fops) \ | |
2278 | do { if (fops) module_put((fops)->owner); } while(0) | |
e84f9e57 AV |
2279 | /* |
2280 | * This one is to be used *ONLY* from ->open() instances. | |
2281 | * fops must be non-NULL, pinned down *and* module dependencies | |
2282 | * should be sufficient to pin the caller down as well. | |
2283 | */ | |
2284 | #define replace_fops(f, fops) \ | |
2285 | do { \ | |
2286 | struct file *__file = (f); \ | |
2287 | fops_put(__file->f_op); \ | |
2288 | BUG_ON(!(__file->f_op = (fops))); \ | |
2289 | } while(0) | |
1da177e4 LT |
2290 | |
2291 | extern int register_filesystem(struct file_system_type *); | |
2292 | extern int unregister_filesystem(struct file_system_type *); | |
d911b458 | 2293 | extern struct vfsmount *kern_mount(struct file_system_type *); |
423e0ab0 | 2294 | extern void kern_unmount(struct vfsmount *mnt); |
1da177e4 LT |
2295 | extern int may_umount_tree(struct vfsmount *); |
2296 | extern int may_umount(struct vfsmount *); | |
5e6123f3 SL |
2297 | extern long do_mount(const char *, const char __user *, |
2298 | const char *, unsigned long, void *); | |
ca71cf71 | 2299 | extern struct vfsmount *collect_mounts(const struct path *); |
8aec0809 | 2300 | extern void drop_collected_mounts(struct vfsmount *); |
1f707137 AV |
2301 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
2302 | struct vfsmount *); | |
f0bb5aaf | 2303 | extern int vfs_statfs(const struct path *, struct kstatfs *); |
c8b91acc AV |
2304 | extern int user_statfs(const char __user *, struct kstatfs *); |
2305 | extern int fd_statfs(int, struct kstatfs *); | |
18e9e510 JB |
2306 | extern int freeze_super(struct super_block *super); |
2307 | extern int thaw_super(struct super_block *super); | |
02125a82 | 2308 | extern bool our_mnt(struct vfsmount *mnt); |
fca39346 JK |
2309 | extern __printf(2, 3) |
2310 | int super_setup_bdi_name(struct super_block *sb, char *fmt, ...); | |
2311 | extern int super_setup_bdi(struct super_block *sb); | |
1da177e4 | 2312 | |
ce3b0f8d AV |
2313 | extern int current_umask(void); |
2314 | ||
5a14696c BF |
2315 | extern void ihold(struct inode * inode); |
2316 | extern void iput(struct inode *); | |
95582b00 | 2317 | extern int generic_update_time(struct inode *, struct timespec64 *, int); |
5a14696c | 2318 | |
f87fd4c2 | 2319 | /* /sys/fs */ |
00d26666 | 2320 | extern struct kobject *fs_kobj; |
f87fd4c2 | 2321 | |
09cbfeaf | 2322 | #define MAX_RW_COUNT (INT_MAX & PAGE_MASK) |
bfcd17a6 | 2323 | |
9e8925b6 | 2324 | #ifdef CONFIG_MANDATORY_FILE_LOCKING |
d7a06983 | 2325 | extern int locks_mandatory_locked(struct file *); |
acc15575 | 2326 | extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char); |
1da177e4 LT |
2327 | |
2328 | /* | |
2329 | * Candidates for mandatory locking have the setgid bit set | |
2330 | * but no group execute bit - an otherwise meaningless combination. | |
2331 | */ | |
a16877ca PE |
2332 | |
2333 | static inline int __mandatory_lock(struct inode *ino) | |
2334 | { | |
2335 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; | |
2336 | } | |
2337 | ||
2338 | /* | |
e462ec50 | 2339 | * ... and these candidates should be on SB_MANDLOCK mounted fs, |
a16877ca PE |
2340 | * otherwise these will be advisory locks |
2341 | */ | |
2342 | ||
2343 | static inline int mandatory_lock(struct inode *ino) | |
2344 | { | |
2345 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); | |
2346 | } | |
1da177e4 | 2347 | |
d7a06983 | 2348 | static inline int locks_verify_locked(struct file *file) |
1da177e4 | 2349 | { |
c568d683 | 2350 | if (mandatory_lock(locks_inode(file))) |
d7a06983 | 2351 | return locks_mandatory_locked(file); |
1da177e4 LT |
2352 | return 0; |
2353 | } | |
2354 | ||
1da177e4 | 2355 | static inline int locks_verify_truncate(struct inode *inode, |
acc15575 | 2356 | struct file *f, |
1da177e4 LT |
2357 | loff_t size) |
2358 | { | |
acc15575 CH |
2359 | if (!inode->i_flctx || !mandatory_lock(inode)) |
2360 | return 0; | |
2361 | ||
2362 | if (size < inode->i_size) { | |
2363 | return locks_mandatory_area(inode, f, size, inode->i_size - 1, | |
2364 | F_WRLCK); | |
2365 | } else { | |
2366 | return locks_mandatory_area(inode, f, inode->i_size, size - 1, | |
2367 | F_WRLCK); | |
2368 | } | |
1da177e4 LT |
2369 | } |
2370 | ||
9e8925b6 JL |
2371 | #else /* !CONFIG_MANDATORY_FILE_LOCKING */ |
2372 | ||
2373 | static inline int locks_mandatory_locked(struct file *file) | |
2374 | { | |
2375 | return 0; | |
2376 | } | |
2377 | ||
fce205e9 LT |
2378 | static inline int locks_mandatory_area(struct inode *inode, struct file *filp, |
2379 | loff_t start, loff_t end, unsigned char type) | |
9e8925b6 JL |
2380 | { |
2381 | return 0; | |
2382 | } | |
2383 | ||
2384 | static inline int __mandatory_lock(struct inode *inode) | |
2385 | { | |
2386 | return 0; | |
2387 | } | |
2388 | ||
2389 | static inline int mandatory_lock(struct inode *inode) | |
2390 | { | |
2391 | return 0; | |
2392 | } | |
2393 | ||
2394 | static inline int locks_verify_locked(struct file *file) | |
2395 | { | |
2396 | return 0; | |
2397 | } | |
2398 | ||
2399 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, | |
2400 | size_t size) | |
2401 | { | |
2402 | return 0; | |
2403 | } | |
2404 | ||
2405 | #endif /* CONFIG_MANDATORY_FILE_LOCKING */ | |
2406 | ||
2407 | ||
2408 | #ifdef CONFIG_FILE_LOCKING | |
1da177e4 LT |
2409 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2410 | { | |
24cbe784 JL |
2411 | /* |
2412 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2413 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2414 | * could end up racing with tasks trying to set a new lease on this | |
2415 | * file. | |
24cbe784 JL |
2416 | */ |
2417 | smp_mb(); | |
8634b51f | 2418 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2419 | return __break_lease(inode, mode, FL_LEASE); |
1da177e4 LT |
2420 | return 0; |
2421 | } | |
df4e8d2c BF |
2422 | |
2423 | static inline int break_deleg(struct inode *inode, unsigned int mode) | |
2424 | { | |
962bd40b JL |
2425 | /* |
2426 | * Since this check is lockless, we must ensure that any refcounts | |
8116bf4c JL |
2427 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2428 | * could end up racing with tasks trying to set a new lease on this | |
2429 | * file. | |
962bd40b JL |
2430 | */ |
2431 | smp_mb(); | |
8634b51f | 2432 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
df4e8d2c | 2433 | return __break_lease(inode, mode, FL_DELEG); |
1da177e4 LT |
2434 | return 0; |
2435 | } | |
df4e8d2c | 2436 | |
5a14696c BF |
2437 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2438 | { | |
2439 | int ret; | |
2440 | ||
2441 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); | |
2442 | if (ret == -EWOULDBLOCK && delegated_inode) { | |
2443 | *delegated_inode = inode; | |
2444 | ihold(inode); | |
2445 | } | |
2446 | return ret; | |
2447 | } | |
2448 | ||
2449 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2450 | { | |
2451 | int ret; | |
2452 | ||
2453 | ret = break_deleg(*delegated_inode, O_WRONLY); | |
2454 | iput(*delegated_inode); | |
2455 | *delegated_inode = NULL; | |
2456 | return ret; | |
2457 | } | |
2458 | ||
11afe9f7 CH |
2459 | static inline int break_layout(struct inode *inode, bool wait) |
2460 | { | |
2461 | smp_mb(); | |
2462 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) | |
2463 | return __break_lease(inode, | |
2464 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, | |
2465 | FL_LAYOUT); | |
2466 | return 0; | |
2467 | } | |
2468 | ||
bfcd17a6 | 2469 | #else /* !CONFIG_FILE_LOCKING */ |
af5df566 SW |
2470 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2471 | { | |
2472 | return 0; | |
2473 | } | |
2474 | ||
df4e8d2c BF |
2475 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2476 | { | |
2477 | return 0; | |
2478 | } | |
5a14696c BF |
2479 | |
2480 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) | |
2481 | { | |
2482 | return 0; | |
2483 | } | |
2484 | ||
2485 | static inline int break_deleg_wait(struct inode **delegated_inode) | |
2486 | { | |
2487 | BUG(); | |
2488 | return 0; | |
2489 | } | |
2490 | ||
11afe9f7 CH |
2491 | static inline int break_layout(struct inode *inode, bool wait) |
2492 | { | |
2493 | return 0; | |
2494 | } | |
2495 | ||
bfcd17a6 | 2496 | #endif /* CONFIG_FILE_LOCKING */ |
1da177e4 LT |
2497 | |
2498 | /* fs/open.c */ | |
adb5c247 | 2499 | struct audit_names; |
91a27b2a | 2500 | struct filename { |
adb5c247 JL |
2501 | const char *name; /* pointer to actual string */ |
2502 | const __user char *uptr; /* original userland pointer */ | |
55422d0b | 2503 | int refcnt; |
1c949843 | 2504 | struct audit_names *aname; |
fd2f7cb5 | 2505 | const char iname[]; |
91a27b2a | 2506 | }; |
f1fffbd4 | 2507 | static_assert(offsetof(struct filename, iname) % sizeof(long) == 0); |
1da177e4 | 2508 | |
7df818b2 | 2509 | extern long vfs_truncate(const struct path *, loff_t); |
4a30131e N |
2510 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
2511 | struct file *filp); | |
72c72bdf | 2512 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
3e63cbb1 | 2513 | loff_t len); |
8e8a1407 | 2514 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
a218d0fd | 2515 | umode_t mode); |
669abf4e | 2516 | extern struct file *file_open_name(struct filename *, int, umode_t); |
a218d0fd | 2517 | extern struct file *filp_open(const char *, int, umode_t); |
73d049a4 | 2518 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
378c6520 | 2519 | const char *, int, umode_t); |
765927b2 | 2520 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
2abc77af AV |
2521 | extern struct file * open_with_fake_path(const struct path *, int, |
2522 | struct inode*, const struct cred *); | |
19f391eb AV |
2523 | static inline struct file *file_clone_open(struct file *file) |
2524 | { | |
2525 | return dentry_open(&file->f_path, file->f_flags, file->f_cred); | |
2526 | } | |
1da177e4 | 2527 | extern int filp_close(struct file *, fl_owner_t id); |
91a27b2a | 2528 | |
51f39a1f | 2529 | extern struct filename *getname_flags(const char __user *, int, int *); |
91a27b2a | 2530 | extern struct filename *getname(const char __user *); |
c4ad8f98 | 2531 | extern struct filename *getname_kernel(const char *); |
55422d0b | 2532 | extern void putname(struct filename *name); |
91a27b2a | 2533 | |
30d90494 | 2534 | extern int finish_open(struct file *file, struct dentry *dentry, |
be12af3e | 2535 | int (*open)(struct inode *, struct file *)); |
e45198a6 | 2536 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
1da177e4 | 2537 | |
3e63cbb1 AJ |
2538 | /* fs/ioctl.c */ |
2539 | ||
2540 | extern int ioctl_preallocate(struct file *filp, void __user *argp); | |
2541 | ||
1da177e4 LT |
2542 | /* fs/dcache.c */ |
2543 | extern void __init vfs_caches_init_early(void); | |
4248b0da | 2544 | extern void __init vfs_caches_init(void); |
1da177e4 | 2545 | |
b86c089b CL |
2546 | extern struct kmem_cache *names_cachep; |
2547 | ||
a608ca21 | 2548 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
3446a8aa | 2549 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
1da177e4 | 2550 | |
9361401e | 2551 | #ifdef CONFIG_BLOCK |
1da177e4 | 2552 | extern int register_blkdev(unsigned int, const char *); |
f4480240 | 2553 | extern void unregister_blkdev(unsigned int, const char *); |
f44f1ab5 | 2554 | extern void bdev_unhash_inode(dev_t dev); |
1da177e4 | 2555 | extern struct block_device *bdget(dev_t); |
dddac6a7 | 2556 | extern struct block_device *bdgrab(struct block_device *bdev); |
1da177e4 LT |
2557 | extern void bd_set_size(struct block_device *, loff_t size); |
2558 | extern void bd_forget(struct inode *inode); | |
2559 | extern void bdput(struct block_device *); | |
585d3bc0 | 2560 | extern void invalidate_bdev(struct block_device *); |
5c0d6b60 | 2561 | extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); |
585d3bc0 | 2562 | extern int sync_blockdev(struct block_device *bdev); |
ff01bb48 | 2563 | extern void kill_bdev(struct block_device *); |
585d3bc0 | 2564 | extern struct super_block *freeze_bdev(struct block_device *); |
c2d75438 | 2565 | extern void emergency_thaw_all(void); |
08fdc8a0 | 2566 | extern void emergency_thaw_bdev(struct super_block *sb); |
585d3bc0 NP |
2567 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
2568 | extern int fsync_bdev(struct block_device *); | |
a212b105 TH |
2569 | |
2570 | extern struct super_block *blockdev_superblock; | |
2571 | ||
2572 | static inline bool sb_is_blkdev_sb(struct super_block *sb) | |
2573 | { | |
2574 | return sb == blockdev_superblock; | |
2575 | } | |
9361401e DH |
2576 | #else |
2577 | static inline void bd_forget(struct inode *inode) {} | |
47e4491b | 2578 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
ff01bb48 | 2579 | static inline void kill_bdev(struct block_device *bdev) {} |
47e4491b AV |
2580 | static inline void invalidate_bdev(struct block_device *bdev) {} |
2581 | ||
2582 | static inline struct super_block *freeze_bdev(struct block_device *sb) | |
2583 | { | |
2584 | return NULL; | |
2585 | } | |
2586 | ||
2587 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) | |
2588 | { | |
2589 | return 0; | |
2590 | } | |
5c0d6b60 | 2591 | |
08fdc8a0 MG |
2592 | static inline int emergency_thaw_bdev(struct super_block *sb) |
2593 | { | |
2594 | return 0; | |
2595 | } | |
2596 | ||
5c0d6b60 JK |
2597 | static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) |
2598 | { | |
2599 | } | |
a8855990 | 2600 | |
3e004eea | 2601 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a8855990 | 2602 | { |
3e004eea | 2603 | return false; |
a8855990 | 2604 | } |
9361401e | 2605 | #endif |
60b0680f | 2606 | extern int sync_filesystem(struct super_block *); |
9361401e | 2607 | extern const struct file_operations def_blk_fops; |
4b6f5d20 | 2608 | extern const struct file_operations def_chr_fops; |
9361401e | 2609 | #ifdef CONFIG_BLOCK |
1da177e4 | 2610 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
56b26add | 2611 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
1da177e4 | 2612 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
e525fd89 | 2613 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
d4d77629 TH |
2614 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
2615 | void *holder); | |
2616 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, | |
2617 | void *holder); | |
4385bab1 | 2618 | extern void blkdev_put(struct block_device *bdev, fmode_t mode); |
be324177 JW |
2619 | extern int __blkdev_reread_part(struct block_device *bdev); |
2620 | extern int blkdev_reread_part(struct block_device *bdev); | |
2621 | ||
641dc636 | 2622 | #ifdef CONFIG_SYSFS |
e09b457b | 2623 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
49731baa TH |
2624 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
2625 | struct gendisk *disk); | |
641dc636 | 2626 | #else |
e09b457b TH |
2627 | static inline int bd_link_disk_holder(struct block_device *bdev, |
2628 | struct gendisk *disk) | |
2629 | { | |
2630 | return 0; | |
2631 | } | |
49731baa TH |
2632 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
2633 | struct gendisk *disk) | |
2634 | { | |
2635 | } | |
641dc636 | 2636 | #endif |
9361401e | 2637 | #endif |
1da177e4 LT |
2638 | |
2639 | /* fs/char_dev.c */ | |
8a932f73 | 2640 | #define CHRDEV_MAJOR_MAX 512 |
49db08c3 LW |
2641 | /* Marks the bottom of the first segment of free char majors */ |
2642 | #define CHRDEV_MAJOR_DYN_END 234 | |
a5d31a3f LG |
2643 | /* Marks the top and bottom of the second segment of free char majors */ |
2644 | #define CHRDEV_MAJOR_DYN_EXT_START 511 | |
2645 | #define CHRDEV_MAJOR_DYN_EXT_END 384 | |
2646 | ||
1da177e4 LT |
2647 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2648 | extern int register_chrdev_region(dev_t, unsigned, const char *); | |
1905b1bf TH |
2649 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2650 | unsigned int count, const char *name, | |
2651 | const struct file_operations *fops); | |
2652 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, | |
2653 | unsigned int count, const char *name); | |
1da177e4 | 2654 | extern void unregister_chrdev_region(dev_t, unsigned); |
68eef3b4 | 2655 | extern void chrdev_show(struct seq_file *,off_t); |
1da177e4 | 2656 | |
1905b1bf TH |
2657 | static inline int register_chrdev(unsigned int major, const char *name, |
2658 | const struct file_operations *fops) | |
2659 | { | |
2660 | return __register_chrdev(major, 0, 256, name, fops); | |
2661 | } | |
2662 | ||
2663 | static inline void unregister_chrdev(unsigned int major, const char *name) | |
2664 | { | |
2665 | __unregister_chrdev(major, 0, 256, name); | |
2666 | } | |
2667 | ||
1da177e4 LT |
2668 | /* fs/block_dev.c */ |
2669 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1f014290 | 2670 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
9361401e DH |
2671 | |
2672 | #ifdef CONFIG_BLOCK | |
133d55cd | 2673 | #define BLKDEV_MAJOR_MAX 512 |
1da177e4 LT |
2674 | extern const char *__bdevname(dev_t, char *buffer); |
2675 | extern const char *bdevname(struct block_device *bdev, char *buffer); | |
2676 | extern struct block_device *lookup_bdev(const char *); | |
68eef3b4 | 2677 | extern void blkdev_show(struct seq_file *,off_t); |
30c40d2c | 2678 | |
9361401e | 2679 | #else |
133d55cd | 2680 | #define BLKDEV_MAJOR_MAX 0 |
9361401e | 2681 | #endif |
1da177e4 LT |
2682 | |
2683 | extern void init_special_inode(struct inode *, umode_t, dev_t); | |
2684 | ||
2685 | /* Invalid inode operations -- fs/bad_inode.c */ | |
2686 | extern void make_bad_inode(struct inode *); | |
0e3ef1fe | 2687 | extern bool is_bad_inode(struct inode *); |
1da177e4 | 2688 | |
c11f0c0b | 2689 | #ifdef CONFIG_BLOCK |
c3279d14 | 2690 | extern void check_disk_size_change(struct gendisk *disk, |
5afb7835 | 2691 | struct block_device *bdev, bool verbose); |
0c002c2f | 2692 | extern int revalidate_disk(struct gendisk *); |
1da177e4 | 2693 | extern int check_disk_change(struct block_device *); |
93b270f7 | 2694 | extern int __invalidate_device(struct block_device *, bool); |
1da177e4 | 2695 | extern int invalidate_partition(struct gendisk *, int); |
9361401e | 2696 | #endif |
1da177e4 LT |
2697 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
2698 | pgoff_t start, pgoff_t end); | |
54bc4855 | 2699 | |
1da177e4 LT |
2700 | static inline void invalidate_remote_inode(struct inode *inode) |
2701 | { | |
2702 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
2703 | S_ISLNK(inode->i_mode)) | |
fc0ecff6 | 2704 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
1da177e4 LT |
2705 | } |
2706 | extern int invalidate_inode_pages2(struct address_space *mapping); | |
2707 | extern int invalidate_inode_pages2_range(struct address_space *mapping, | |
2708 | pgoff_t start, pgoff_t end); | |
2709 | extern int write_inode_now(struct inode *, int); | |
2710 | extern int filemap_fdatawrite(struct address_space *); | |
2711 | extern int filemap_flush(struct address_space *); | |
76341cab | 2712 | extern int filemap_fdatawait_keep_errors(struct address_space *mapping); |
d3bccb6f JK |
2713 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
2714 | loff_t lend); | |
aa0bfcd9 RZ |
2715 | extern int filemap_fdatawait_range_keep_errors(struct address_space *mapping, |
2716 | loff_t start_byte, loff_t end_byte); | |
ffb959bb JL |
2717 | |
2718 | static inline int filemap_fdatawait(struct address_space *mapping) | |
2719 | { | |
2720 | return filemap_fdatawait_range(mapping, 0, LLONG_MAX); | |
2721 | } | |
2722 | ||
7fc9e472 GR |
2723 | extern bool filemap_range_has_page(struct address_space *, loff_t lstart, |
2724 | loff_t lend); | |
1da177e4 LT |
2725 | extern int filemap_write_and_wait(struct address_space *mapping); |
2726 | extern int filemap_write_and_wait_range(struct address_space *mapping, | |
2727 | loff_t lstart, loff_t lend); | |
ebcf28e1 AM |
2728 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
2729 | loff_t start, loff_t end, int sync_mode); | |
f4c0a0fd JK |
2730 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
2731 | loff_t start, loff_t end); | |
d72d9e2a | 2732 | extern int filemap_check_errors(struct address_space *mapping); |
5660e13d | 2733 | extern void __filemap_set_wb_err(struct address_space *mapping, int err); |
a823e458 JL |
2734 | |
2735 | extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, | |
2736 | loff_t lend); | |
5660e13d JL |
2737 | extern int __must_check file_check_and_advance_wb_err(struct file *file); |
2738 | extern int __must_check file_write_and_wait_range(struct file *file, | |
2739 | loff_t start, loff_t end); | |
2740 | ||
a823e458 JL |
2741 | static inline int file_write_and_wait(struct file *file) |
2742 | { | |
2743 | return file_write_and_wait_range(file, 0, LLONG_MAX); | |
2744 | } | |
2745 | ||
5660e13d JL |
2746 | /** |
2747 | * filemap_set_wb_err - set a writeback error on an address_space | |
2748 | * @mapping: mapping in which to set writeback error | |
2749 | * @err: error to be set in mapping | |
2750 | * | |
2751 | * When writeback fails in some way, we must record that error so that | |
2752 | * userspace can be informed when fsync and the like are called. We endeavor | |
2753 | * to report errors on any file that was open at the time of the error. Some | |
2754 | * internal callers also need to know when writeback errors have occurred. | |
2755 | * | |
2756 | * When a writeback error occurs, most filesystems will want to call | |
2757 | * filemap_set_wb_err to record the error in the mapping so that it will be | |
2758 | * automatically reported whenever fsync is called on the file. | |
5660e13d JL |
2759 | */ |
2760 | static inline void filemap_set_wb_err(struct address_space *mapping, int err) | |
2761 | { | |
2762 | /* Fastpath for common case of no error */ | |
2763 | if (unlikely(err)) | |
2764 | __filemap_set_wb_err(mapping, err); | |
2765 | } | |
2766 | ||
2767 | /** | |
2768 | * filemap_check_wb_error - has an error occurred since the mark was sampled? | |
2769 | * @mapping: mapping to check for writeback errors | |
2770 | * @since: previously-sampled errseq_t | |
2771 | * | |
2772 | * Grab the errseq_t value from the mapping, and see if it has changed "since" | |
2773 | * the given value was sampled. | |
2774 | * | |
2775 | * If it has then report the latest error set, otherwise return 0. | |
2776 | */ | |
2777 | static inline int filemap_check_wb_err(struct address_space *mapping, | |
2778 | errseq_t since) | |
2779 | { | |
2780 | return errseq_check(&mapping->wb_err, since); | |
2781 | } | |
2782 | ||
2783 | /** | |
2784 | * filemap_sample_wb_err - sample the current errseq_t to test for later errors | |
2785 | * @mapping: mapping to be sampled | |
2786 | * | |
2787 | * Writeback errors are always reported relative to a particular sample point | |
2788 | * in the past. This function provides those sample points. | |
2789 | */ | |
2790 | static inline errseq_t filemap_sample_wb_err(struct address_space *mapping) | |
2791 | { | |
2792 | return errseq_sample(&mapping->wb_err); | |
2793 | } | |
2794 | ||
8018ab05 CH |
2795 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2796 | int datasync); | |
2797 | extern int vfs_fsync(struct file *file, int datasync); | |
e2592217 | 2798 | |
22f96b38 JA |
2799 | extern int sync_file_range(struct file *file, loff_t offset, loff_t nbytes, |
2800 | unsigned int flags); | |
2801 | ||
e2592217 CH |
2802 | /* |
2803 | * Sync the bytes written if this was a synchronous write. Expect ki_pos | |
2804 | * to already be updated for the write, and will return either the amount | |
2805 | * of bytes passed in, or an error if syncing the file failed. | |
2806 | */ | |
2807 | static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) | |
2808 | { | |
2809 | if (iocb->ki_flags & IOCB_DSYNC) { | |
2810 | int ret = vfs_fsync_range(iocb->ki_filp, | |
2811 | iocb->ki_pos - count, iocb->ki_pos - 1, | |
2812 | (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); | |
2813 | if (ret) | |
2814 | return ret; | |
2815 | } | |
2816 | ||
2817 | return count; | |
d311d79d | 2818 | } |
e2592217 | 2819 | |
1da177e4 LT |
2820 | extern void emergency_sync(void); |
2821 | extern void emergency_remount(void); | |
9361401e | 2822 | #ifdef CONFIG_BLOCK |
1da177e4 | 2823 | extern sector_t bmap(struct inode *, sector_t); |
9361401e | 2824 | #endif |
27ac0ffe | 2825 | extern int notify_change(struct dentry *, struct iattr *, struct inode **); |
f419a2e3 | 2826 | extern int inode_permission(struct inode *, int); |
2830ba7f | 2827 | extern int generic_permission(struct inode *, int); |
cbdf35bc | 2828 | extern int __check_sticky(struct inode *dir, struct inode *inode); |
1da177e4 | 2829 | |
f696a365 MS |
2830 | static inline bool execute_ok(struct inode *inode) |
2831 | { | |
2832 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); | |
2833 | } | |
2834 | ||
8d71db4f AV |
2835 | static inline void file_start_write(struct file *file) |
2836 | { | |
2837 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2838 | return; | |
2839 | __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); | |
2840 | } | |
2841 | ||
5ae98f15 JK |
2842 | static inline bool file_start_write_trylock(struct file *file) |
2843 | { | |
2844 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2845 | return true; | |
2846 | return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); | |
2847 | } | |
2848 | ||
8d71db4f AV |
2849 | static inline void file_end_write(struct file *file) |
2850 | { | |
2851 | if (!S_ISREG(file_inode(file)->i_mode)) | |
2852 | return; | |
2853 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); | |
2854 | } | |
bfe219d3 | 2855 | |
07b8ce1e AV |
2856 | /* |
2857 | * get_write_access() gets write permission for a file. | |
2858 | * put_write_access() releases this write permission. | |
2859 | * This is used for regular files. | |
2860 | * We cannot support write (and maybe mmap read-write shared) accesses and | |
2861 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode | |
2862 | * can have the following values: | |
2863 | * 0: no writers, no VM_DENYWRITE mappings | |
2864 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist | |
2865 | * > 0: (i_writecount) users are writing to the file. | |
2866 | * | |
2867 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe | |
2868 | * except for the cases where we don't hold i_writecount yet. Then we need to | |
2869 | * use {get,deny}_write_access() - these functions check the sign and refuse | |
2870 | * to do the change if sign is wrong. | |
2871 | */ | |
2872 | static inline int get_write_access(struct inode *inode) | |
2873 | { | |
2874 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; | |
2875 | } | |
2876 | static inline int deny_write_access(struct file *file) | |
2877 | { | |
496ad9aa | 2878 | struct inode *inode = file_inode(file); |
07b8ce1e AV |
2879 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2880 | } | |
1da177e4 LT |
2881 | static inline void put_write_access(struct inode * inode) |
2882 | { | |
2883 | atomic_dec(&inode->i_writecount); | |
2884 | } | |
2885 | static inline void allow_write_access(struct file *file) | |
2886 | { | |
2887 | if (file) | |
496ad9aa | 2888 | atomic_inc(&file_inode(file)->i_writecount); |
1da177e4 | 2889 | } |
f1fe29b4 DH |
2890 | static inline bool inode_is_open_for_write(const struct inode *inode) |
2891 | { | |
2892 | return atomic_read(&inode->i_writecount) > 0; | |
2893 | } | |
2894 | ||
a5c96ebf MZ |
2895 | #ifdef CONFIG_IMA |
2896 | static inline void i_readcount_dec(struct inode *inode) | |
2897 | { | |
2898 | BUG_ON(!atomic_read(&inode->i_readcount)); | |
2899 | atomic_dec(&inode->i_readcount); | |
2900 | } | |
2901 | static inline void i_readcount_inc(struct inode *inode) | |
2902 | { | |
2903 | atomic_inc(&inode->i_readcount); | |
2904 | } | |
2905 | #else | |
2906 | static inline void i_readcount_dec(struct inode *inode) | |
2907 | { | |
2908 | return; | |
2909 | } | |
2910 | static inline void i_readcount_inc(struct inode *inode) | |
2911 | { | |
2912 | return; | |
2913 | } | |
2914 | #endif | |
ed8cae8b | 2915 | extern int do_pipe_flags(int *, int); |
1da177e4 | 2916 | |
1284ab5b MZ |
2917 | #define __kernel_read_file_id(id) \ |
2918 | id(UNKNOWN, unknown) \ | |
2919 | id(FIRMWARE, firmware) \ | |
a098ecd2 | 2920 | id(FIRMWARE_PREALLOC_BUFFER, firmware) \ |
1284ab5b MZ |
2921 | id(MODULE, kernel-module) \ |
2922 | id(KEXEC_IMAGE, kexec-image) \ | |
2923 | id(KEXEC_INITRAMFS, kexec-initramfs) \ | |
2924 | id(POLICY, security-policy) \ | |
a7d3d039 | 2925 | id(X509_CERTIFICATE, x509-certificate) \ |
1284ab5b MZ |
2926 | id(MAX_ID, ) |
2927 | ||
2928 | #define __fid_enumify(ENUM, dummy) READING_ ## ENUM, | |
2929 | #define __fid_stringify(dummy, str) #str, | |
2930 | ||
bc8ca5b9 | 2931 | enum kernel_read_file_id { |
1284ab5b MZ |
2932 | __kernel_read_file_id(__fid_enumify) |
2933 | }; | |
2934 | ||
2935 | static const char * const kernel_read_file_str[] = { | |
2936 | __kernel_read_file_id(__fid_stringify) | |
bc8ca5b9 MZ |
2937 | }; |
2938 | ||
da20dfe6 | 2939 | static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id) |
1284ab5b | 2940 | { |
cbfd0c10 | 2941 | if ((unsigned)id >= READING_MAX_ID) |
1284ab5b MZ |
2942 | return kernel_read_file_str[READING_UNKNOWN]; |
2943 | ||
2944 | return kernel_read_file_str[id]; | |
2945 | } | |
2946 | ||
bc8ca5b9 MZ |
2947 | extern int kernel_read_file(struct file *, void **, loff_t *, loff_t, |
2948 | enum kernel_read_file_id); | |
711aab1d | 2949 | extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t, |
09596b94 | 2950 | enum kernel_read_file_id); |
b844f0ec MZ |
2951 | extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t, |
2952 | enum kernel_read_file_id); | |
bdd1d2d3 | 2953 | extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *); |
e13ec939 | 2954 | extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *); |
73e18f7c | 2955 | extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *); |
1da177e4 LT |
2956 | extern struct file * open_exec(const char *); |
2957 | ||
2958 | /* fs/dcache.c -- generic fs support functions */ | |
a6e5787f | 2959 | extern bool is_subdir(struct dentry *, struct dentry *); |
640eb7e7 | 2960 | extern bool path_is_under(const struct path *, const struct path *); |
1da177e4 | 2961 | |
9bf39ab2 MS |
2962 | extern char *file_path(struct file *, char *, int); |
2963 | ||
1da177e4 LT |
2964 | #include <linux/err.h> |
2965 | ||
2966 | /* needed for stackable file system support */ | |
965c8e59 | 2967 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2968 | |
965c8e59 | 2969 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
1da177e4 | 2970 | |
54e34621 | 2971 | extern int inode_init_always(struct super_block *, struct inode *); |
1da177e4 | 2972 | extern void inode_init_once(struct inode *); |
2aa15890 | 2973 | extern void address_space_init_once(struct address_space *mapping); |
1da177e4 LT |
2974 | extern struct inode * igrab(struct inode *); |
2975 | extern ino_t iunique(struct super_block *, ino_t); | |
2976 | extern int inode_needs_sync(struct inode *inode); | |
45321ac5 | 2977 | extern int generic_delete_inode(struct inode *inode); |
9bcb4b73 AV |
2978 | static inline int generic_drop_inode(struct inode *inode) |
2979 | { | |
2980 | return !inode->i_nlink || inode_unhashed(inode); | |
2981 | } | |
1da177e4 | 2982 | |
88bd5121 AA |
2983 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
2984 | unsigned long hashval, int (*test)(struct inode *, void *), | |
2985 | void *data); | |
1da177e4 LT |
2986 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
2987 | int (*test)(struct inode *, void *), void *data); | |
2988 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); | |
2989 | ||
80ea09a0 MS |
2990 | extern struct inode *inode_insert5(struct inode *inode, unsigned long hashval, |
2991 | int (*test)(struct inode *, void *), | |
2992 | int (*set)(struct inode *, void *), | |
2993 | void *data); | |
1da177e4 LT |
2994 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
2995 | extern struct inode * iget_locked(struct super_block *, unsigned long); | |
fe032c42 TT |
2996 | extern struct inode *find_inode_nowait(struct super_block *, |
2997 | unsigned long, | |
2998 | int (*match)(struct inode *, | |
2999 | unsigned long, void *), | |
3000 | void *data); | |
261bca86 AV |
3001 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
3002 | extern int insert_inode_locked(struct inode *); | |
e096d0c7 JB |
3003 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
3004 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); | |
3005 | #else | |
3006 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; | |
3007 | #endif | |
1da177e4 | 3008 | extern void unlock_new_inode(struct inode *); |
c2b6d621 | 3009 | extern void discard_new_inode(struct inode *); |
85fe4025 | 3010 | extern unsigned int get_next_ino(void); |
799ea9e9 | 3011 | extern void evict_inodes(struct super_block *sb); |
1da177e4 | 3012 | |
1da177e4 | 3013 | extern void __iget(struct inode * inode); |
b46980fe | 3014 | extern void iget_failed(struct inode *); |
dbd5768f | 3015 | extern void clear_inode(struct inode *); |
2e00c97e | 3016 | extern void __destroy_inode(struct inode *); |
a209dfc7 ED |
3017 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
3018 | extern struct inode *new_inode(struct super_block *sb); | |
ff0c7d15 | 3019 | extern void free_inode_nonrcu(struct inode *inode); |
01de85e0 | 3020 | extern int should_remove_suid(struct dentry *); |
5fa8e0a1 | 3021 | extern int file_remove_privs(struct file *); |
1da177e4 LT |
3022 | |
3023 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); | |
646ec461 CH |
3024 | static inline void insert_inode_hash(struct inode *inode) |
3025 | { | |
1da177e4 LT |
3026 | __insert_inode_hash(inode, inode->i_ino); |
3027 | } | |
f2ee7abf ED |
3028 | |
3029 | extern void __remove_inode_hash(struct inode *); | |
3030 | static inline void remove_inode_hash(struct inode *inode) | |
3031 | { | |
cbedaac6 | 3032 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
f2ee7abf ED |
3033 | __remove_inode_hash(inode); |
3034 | } | |
3035 | ||
646ec461 | 3036 | extern void inode_sb_list_add(struct inode *inode); |
1da177e4 | 3037 | |
9361401e | 3038 | #ifdef CONFIG_BLOCK |
1da177e4 | 3039 | extern int bdev_read_only(struct block_device *); |
9361401e | 3040 | #endif |
1da177e4 LT |
3041 | extern int set_blocksize(struct block_device *, int); |
3042 | extern int sb_set_blocksize(struct super_block *, int); | |
3043 | extern int sb_min_blocksize(struct super_block *, int); | |
3044 | ||
3045 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); | |
3046 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); | |
3309dd04 | 3047 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
1383a7ed DW |
3048 | extern int generic_remap_checks(struct file *file_in, loff_t pos_in, |
3049 | struct file *file_out, loff_t pos_out, | |
42ec3d4c | 3050 | loff_t *count, unsigned int remap_flags); |
ed978a81 | 3051 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
8174202b | 3052 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
8174202b | 3053 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
1af5bb49 | 3054 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *); |
3b93f911 | 3055 | extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); |
88e6faef | 3056 | |
18e9710e | 3057 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, |
ddef7ed2 | 3058 | rwf_t flags); |
abbb6589 | 3059 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, |
ddef7ed2 | 3060 | rwf_t flags); |
dbe4e192 | 3061 | |
eef99380 | 3062 | /* fs/block_dev.c */ |
b2de525f | 3063 | extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); |
1456c0a8 | 3064 | extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); |
02c24a82 JB |
3065 | extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, |
3066 | int datasync); | |
ff01bb48 | 3067 | extern void block_sync_page(struct page *page); |
eef99380 | 3068 | |
88e6faef | 3069 | /* fs/splice.c */ |
cbb7e577 | 3070 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
88e6faef | 3071 | struct pipe_inode_info *, size_t, unsigned int); |
8d020765 | 3072 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
cbb7e577 | 3073 | struct file *, loff_t *, size_t, unsigned int); |
88e6faef | 3074 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
cbb7e577 | 3075 | struct file *out, loff_t *, size_t len, unsigned int flags); |
1c118596 MS |
3076 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
3077 | loff_t *opos, size_t len, unsigned int flags); | |
3078 | ||
88e6faef | 3079 | |
1da177e4 LT |
3080 | extern void |
3081 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); | |
965c8e59 AM |
3082 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
3083 | extern loff_t no_llseek(struct file *file, loff_t offset, int whence); | |
46a1c2c7 | 3084 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
965c8e59 | 3085 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
5760495a | 3086 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
965c8e59 | 3087 | int whence, loff_t maxsize, loff_t eof); |
1bf9d14d AV |
3088 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
3089 | int whence, loff_t size); | |
b25472f9 AV |
3090 | extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t); |
3091 | extern loff_t no_seek_end_llseek(struct file *, loff_t, int); | |
1da177e4 LT |
3092 | extern int generic_file_open(struct inode * inode, struct file * filp); |
3093 | extern int nonseekable_open(struct inode * inode, struct file * filp); | |
10dce8af | 3094 | extern int stream_open(struct inode * inode, struct file * filp); |
1da177e4 | 3095 | |
9361401e | 3096 | #ifdef CONFIG_BLOCK |
8a4c1e42 | 3097 | typedef void (dio_submit_t)(struct bio *bio, struct inode *inode, |
facd07b0 | 3098 | loff_t file_offset); |
1da177e4 LT |
3099 | |
3100 | enum { | |
1e431f5c CH |
3101 | /* need locking between buffered and direct access */ |
3102 | DIO_LOCKING = 0x01, | |
3103 | ||
3104 | /* filesystem does not support filling holes */ | |
3105 | DIO_SKIP_HOLES = 0x02, | |
1da177e4 LT |
3106 | }; |
3107 | ||
4055351c | 3108 | void dio_end_io(struct bio *bio); |
5a9d929d | 3109 | void dio_warn_stale_pagecache(struct file *filp); |
eafdc7d1 | 3110 | |
17f8c842 OS |
3111 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
3112 | struct block_device *bdev, struct iov_iter *iter, | |
c8b8e32d | 3113 | get_block_t get_block, |
17f8c842 OS |
3114 | dio_iodone_t end_io, dio_submit_t submit_io, |
3115 | int flags); | |
7bb46a67 | 3116 | |
17f8c842 OS |
3117 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
3118 | struct inode *inode, | |
c8b8e32d | 3119 | struct iov_iter *iter, |
17f8c842 | 3120 | get_block_t get_block) |
1da177e4 | 3121 | { |
17f8c842 | 3122 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 3123 | get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); |
1da177e4 | 3124 | } |
9361401e | 3125 | #endif |
1da177e4 | 3126 | |
1d59d61f | 3127 | void inode_dio_wait(struct inode *inode); |
fe0f07d0 JA |
3128 | |
3129 | /* | |
3130 | * inode_dio_begin - signal start of a direct I/O requests | |
3131 | * @inode: inode the direct I/O happens on | |
3132 | * | |
3133 | * This is called once we've finished processing a direct I/O request, | |
3134 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
3135 | */ | |
3136 | static inline void inode_dio_begin(struct inode *inode) | |
3137 | { | |
3138 | atomic_inc(&inode->i_dio_count); | |
3139 | } | |
3140 | ||
3141 | /* | |
3142 | * inode_dio_end - signal finish of a direct I/O requests | |
3143 | * @inode: inode the direct I/O happens on | |
3144 | * | |
3145 | * This is called once we've finished processing a direct I/O request, | |
3146 | * and is used to wake up callers waiting for direct I/O to be quiesced. | |
3147 | */ | |
3148 | static inline void inode_dio_end(struct inode *inode) | |
3149 | { | |
3150 | if (atomic_dec_and_test(&inode->i_dio_count)) | |
3151 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); | |
3152 | } | |
1d59d61f | 3153 | |
5f16f322 TT |
3154 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
3155 | unsigned int mask); | |
3156 | ||
4b6f5d20 | 3157 | extern const struct file_operations generic_ro_fops; |
1da177e4 LT |
3158 | |
3159 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) | |
3160 | ||
5d826c84 | 3161 | extern int readlink_copy(char __user *, int, const char *); |
1da177e4 | 3162 | extern int page_readlink(struct dentry *, char __user *, int); |
fceef393 AV |
3163 | extern const char *page_get_link(struct dentry *, struct inode *, |
3164 | struct delayed_call *); | |
3165 | extern void page_put_link(void *); | |
0adb25d2 | 3166 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
54566b2c | 3167 | int nofs); |
1da177e4 | 3168 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
c5ef1c42 | 3169 | extern const struct inode_operations page_symlink_inode_operations; |
fceef393 | 3170 | extern void kfree_link(void *); |
1da177e4 | 3171 | extern void generic_fillattr(struct inode *, struct kstat *); |
a528d35e DH |
3172 | extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int); |
3173 | extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int); | |
b462707e | 3174 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 3175 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
1c8924eb | 3176 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
1da177e4 | 3177 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
f4a8116a JK |
3178 | static inline loff_t __inode_get_bytes(struct inode *inode) |
3179 | { | |
3180 | return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; | |
3181 | } | |
1da177e4 LT |
3182 | loff_t inode_get_bytes(struct inode *inode); |
3183 | void inode_set_bytes(struct inode *inode, loff_t bytes); | |
fceef393 AV |
3184 | const char *simple_get_link(struct dentry *, struct inode *, |
3185 | struct delayed_call *); | |
61ba64fc | 3186 | extern const struct inode_operations simple_symlink_inode_operations; |
1da177e4 | 3187 | |
5c0ba4e0 | 3188 | extern int iterate_dir(struct file *, struct dir_context *); |
1da177e4 | 3189 | |
a528d35e DH |
3190 | extern int vfs_statx(int, const char __user *, int, struct kstat *, u32); |
3191 | extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int); | |
3192 | ||
3193 | static inline int vfs_stat(const char __user *filename, struct kstat *stat) | |
3194 | { | |
deccf497 DH |
3195 | return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT, |
3196 | stat, STATX_BASIC_STATS); | |
a528d35e DH |
3197 | } |
3198 | static inline int vfs_lstat(const char __user *name, struct kstat *stat) | |
3199 | { | |
deccf497 | 3200 | return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT, |
a528d35e DH |
3201 | stat, STATX_BASIC_STATS); |
3202 | } | |
3203 | static inline int vfs_fstatat(int dfd, const char __user *filename, | |
3204 | struct kstat *stat, int flags) | |
3205 | { | |
5d38f049 IK |
3206 | return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT, |
3207 | stat, STATX_BASIC_STATS); | |
a528d35e DH |
3208 | } |
3209 | static inline int vfs_fstat(int fd, struct kstat *stat) | |
3210 | { | |
3211 | return vfs_statx_fd(fd, stat, STATX_BASIC_STATS, 0); | |
3212 | } | |
3213 | ||
3214 | ||
d60874cd | 3215 | extern const char *vfs_get_link(struct dentry *, struct delayed_call *); |
fd4a0edf | 3216 | extern int vfs_readlink(struct dentry *, char __user *, int); |
1da177e4 | 3217 | |
e9079cce | 3218 | extern int __generic_block_fiemap(struct inode *inode, |
3a3076f4 JB |
3219 | struct fiemap_extent_info *fieinfo, |
3220 | loff_t start, loff_t len, | |
3221 | get_block_t *get_block); | |
68c9d702 JB |
3222 | extern int generic_block_fiemap(struct inode *inode, |
3223 | struct fiemap_extent_info *fieinfo, u64 start, | |
3224 | u64 len, get_block_t *get_block); | |
1da177e4 | 3225 | |
ee416bcd | 3226 | extern struct file_system_type *get_filesystem(struct file_system_type *fs); |
c18479fe | 3227 | extern void put_filesystem(struct file_system_type *fs); |
1da177e4 LT |
3228 | extern struct file_system_type *get_fs_type(const char *name); |
3229 | extern struct super_block *get_super(struct block_device *); | |
6b6dc836 | 3230 | extern struct super_block *get_super_thawed(struct block_device *); |
ba6379f7 | 3231 | extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev); |
4504230a | 3232 | extern struct super_block *get_active_super(struct block_device *bdev); |
1da177e4 | 3233 | extern void drop_super(struct super_block *sb); |
ba6379f7 | 3234 | extern void drop_super_exclusive(struct super_block *sb); |
01a05b33 | 3235 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
43e15cdb AV |
3236 | extern void iterate_supers_type(struct file_system_type *, |
3237 | void (*)(struct super_block *, void *), void *); | |
1da177e4 LT |
3238 | |
3239 | extern int dcache_dir_open(struct inode *, struct file *); | |
3240 | extern int dcache_dir_close(struct inode *, struct file *); | |
3241 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); | |
5f99f4e7 | 3242 | extern int dcache_readdir(struct file *, struct dir_context *); |
7bb46a67 | 3243 | extern int simple_setattr(struct dentry *, struct iattr *); |
a528d35e | 3244 | extern int simple_getattr(const struct path *, struct kstat *, u32, unsigned int); |
726c3342 | 3245 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
20955e89 | 3246 | extern int simple_open(struct inode *inode, struct file *file); |
1da177e4 LT |
3247 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
3248 | extern int simple_unlink(struct inode *, struct dentry *); | |
3249 | extern int simple_rmdir(struct inode *, struct dentry *); | |
e0e0be8a MS |
3250 | extern int simple_rename(struct inode *, struct dentry *, |
3251 | struct inode *, struct dentry *, unsigned int); | |
02c24a82 | 3252 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
f44c7763 DW |
3253 | extern int noop_set_page_dirty(struct page *page); |
3254 | extern void noop_invalidatepage(struct page *page, unsigned int offset, | |
3255 | unsigned int length); | |
3256 | extern ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter); | |
1da177e4 LT |
3257 | extern int simple_empty(struct dentry *); |
3258 | extern int simple_readpage(struct file *file, struct page *page); | |
afddba49 NP |
3259 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
3260 | loff_t pos, unsigned len, unsigned flags, | |
3261 | struct page **pagep, void **fsdata); | |
3262 | extern int simple_write_end(struct file *file, struct address_space *mapping, | |
3263 | loff_t pos, unsigned len, unsigned copied, | |
3264 | struct page *page, void *fsdata); | |
b26d4cd3 | 3265 | extern int always_delete_dentry(const struct dentry *); |
6987843f | 3266 | extern struct inode *alloc_anon_inode(struct super_block *); |
e6f5c789 | 3267 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
b26d4cd3 | 3268 | extern const struct dentry_operations simple_dentry_operations; |
1da177e4 | 3269 | |
00cd8dd3 | 3270 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
1da177e4 | 3271 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
4b6f5d20 | 3272 | extern const struct file_operations simple_dir_operations; |
c5ef1c42 | 3273 | extern const struct inode_operations simple_dir_inode_operations; |
fbabfd0f EB |
3274 | extern void make_empty_dir_inode(struct inode *inode); |
3275 | extern bool is_empty_dir_inode(struct inode *inode); | |
cda37124 | 3276 | struct tree_descr { const char *name; const struct file_operations *ops; int mode; }; |
1da177e4 | 3277 | struct dentry *d_alloc_name(struct dentry *, const char *); |
cda37124 EB |
3278 | extern int simple_fill_super(struct super_block *, unsigned long, |
3279 | const struct tree_descr *); | |
1f5ce9e9 | 3280 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
1da177e4 LT |
3281 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
3282 | ||
93b07113 AM |
3283 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
3284 | loff_t *ppos, const void *from, size_t available); | |
6a727b43 JS |
3285 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
3286 | const void __user *from, size_t count); | |
1da177e4 | 3287 | |
ac13a829 | 3288 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
02c24a82 | 3289 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
d5aacad5 | 3290 | |
30ca22c7 PL |
3291 | extern int generic_check_addressable(unsigned, u64); |
3292 | ||
e965f963 | 3293 | #ifdef CONFIG_MIGRATION |
2d1db3b1 | 3294 | extern int buffer_migrate_page(struct address_space *, |
a6bc32b8 MG |
3295 | struct page *, struct page *, |
3296 | enum migrate_mode); | |
89cb0888 JK |
3297 | extern int buffer_migrate_page_norefs(struct address_space *, |
3298 | struct page *, struct page *, | |
3299 | enum migrate_mode); | |
e965f963 CL |
3300 | #else |
3301 | #define buffer_migrate_page NULL | |
89cb0888 | 3302 | #define buffer_migrate_page_norefs NULL |
e965f963 CL |
3303 | #endif |
3304 | ||
31051c85 | 3305 | extern int setattr_prepare(struct dentry *, struct iattr *); |
25d9e2d1 | 3306 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
6a1a90ad | 3307 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
1da177e4 | 3308 | |
c3b2da31 | 3309 | extern int file_update_time(struct file *file); |
1da177e4 | 3310 | |
d475c634 MW |
3311 | static inline bool io_is_direct(struct file *filp) |
3312 | { | |
65f87ee7 | 3313 | return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host); |
d475c634 MW |
3314 | } |
3315 | ||
baabda26 DW |
3316 | static inline bool vma_is_dax(struct vm_area_struct *vma) |
3317 | { | |
3318 | return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); | |
3319 | } | |
3320 | ||
2bb6d283 DW |
3321 | static inline bool vma_is_fsdax(struct vm_area_struct *vma) |
3322 | { | |
3323 | struct inode *inode; | |
3324 | ||
3325 | if (!vma->vm_file) | |
3326 | return false; | |
3327 | if (!vma_is_dax(vma)) | |
3328 | return false; | |
3329 | inode = file_inode(vma->vm_file); | |
230f5a89 | 3330 | if (S_ISCHR(inode->i_mode)) |
2bb6d283 DW |
3331 | return false; /* device-dax */ |
3332 | return true; | |
3333 | } | |
3334 | ||
2ba48ce5 AV |
3335 | static inline int iocb_flags(struct file *file) |
3336 | { | |
3337 | int res = 0; | |
3338 | if (file->f_flags & O_APPEND) | |
3339 | res |= IOCB_APPEND; | |
3340 | if (io_is_direct(file)) | |
3341 | res |= IOCB_DIRECT; | |
dde0c2e7 CH |
3342 | if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) |
3343 | res |= IOCB_DSYNC; | |
3344 | if (file->f_flags & __O_SYNC) | |
3345 | res |= IOCB_SYNC; | |
2ba48ce5 AV |
3346 | return res; |
3347 | } | |
3348 | ||
ddef7ed2 | 3349 | static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) |
fdd2f5b7 GR |
3350 | { |
3351 | if (unlikely(flags & ~RWF_SUPPORTED)) | |
3352 | return -EOPNOTSUPP; | |
3353 | ||
b745fafa | 3354 | if (flags & RWF_NOWAIT) { |
91f9943e | 3355 | if (!(ki->ki_filp->f_mode & FMODE_NOWAIT)) |
b745fafa GR |
3356 | return -EOPNOTSUPP; |
3357 | ki->ki_flags |= IOCB_NOWAIT; | |
3358 | } | |
fdd2f5b7 GR |
3359 | if (flags & RWF_HIPRI) |
3360 | ki->ki_flags |= IOCB_HIPRI; | |
3361 | if (flags & RWF_DSYNC) | |
3362 | ki->ki_flags |= IOCB_DSYNC; | |
3363 | if (flags & RWF_SYNC) | |
3364 | ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC); | |
e1fc742e JB |
3365 | if (flags & RWF_APPEND) |
3366 | ki->ki_flags |= IOCB_APPEND; | |
fdd2f5b7 GR |
3367 | return 0; |
3368 | } | |
3369 | ||
1da177e4 LT |
3370 | static inline ino_t parent_ino(struct dentry *dentry) |
3371 | { | |
3372 | ino_t res; | |
3373 | ||
b5c84bf6 NP |
3374 | /* |
3375 | * Don't strictly need d_lock here? If the parent ino could change | |
3376 | * then surely we'd have a deeper race in the caller? | |
3377 | */ | |
1da177e4 LT |
3378 | spin_lock(&dentry->d_lock); |
3379 | res = dentry->d_parent->d_inode->i_ino; | |
3380 | spin_unlock(&dentry->d_lock); | |
3381 | return res; | |
3382 | } | |
3383 | ||
1da177e4 LT |
3384 | /* Transaction based IO helpers */ |
3385 | ||
3386 | /* | |
3387 | * An argresp is stored in an allocated page and holds the | |
3388 | * size of the argument or response, along with its content | |
3389 | */ | |
3390 | struct simple_transaction_argresp { | |
3391 | ssize_t size; | |
3392 | char data[0]; | |
3393 | }; | |
3394 | ||
3395 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) | |
3396 | ||
3397 | char *simple_transaction_get(struct file *file, const char __user *buf, | |
3398 | size_t size); | |
3399 | ssize_t simple_transaction_read(struct file *file, char __user *buf, | |
3400 | size_t size, loff_t *pos); | |
3401 | int simple_transaction_release(struct inode *inode, struct file *file); | |
3402 | ||
76791ab2 | 3403 | void simple_transaction_set(struct file *file, size_t n); |
1da177e4 | 3404 | |
acaefc25 AB |
3405 | /* |
3406 | * simple attribute files | |
3407 | * | |
3408 | * These attributes behave similar to those in sysfs: | |
3409 | * | |
3410 | * Writing to an attribute immediately sets a value, an open file can be | |
3411 | * written to multiple times. | |
3412 | * | |
3413 | * Reading from an attribute creates a buffer from the value that might get | |
3414 | * read with multiple read calls. When the attribute has been read | |
3415 | * completely, no further read calls are possible until the file is opened | |
3416 | * again. | |
3417 | * | |
3418 | * All attributes contain a text representation of a numeric value | |
3419 | * that are accessed with the get() and set() functions. | |
3420 | */ | |
3421 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ | |
3422 | static int __fops ## _open(struct inode *inode, struct file *file) \ | |
3423 | { \ | |
3424 | __simple_attr_check_format(__fmt, 0ull); \ | |
3425 | return simple_attr_open(inode, file, __get, __set, __fmt); \ | |
3426 | } \ | |
828c0950 | 3427 | static const struct file_operations __fops = { \ |
acaefc25 AB |
3428 | .owner = THIS_MODULE, \ |
3429 | .open = __fops ## _open, \ | |
74bedc4d | 3430 | .release = simple_attr_release, \ |
acaefc25 AB |
3431 | .read = simple_attr_read, \ |
3432 | .write = simple_attr_write, \ | |
1ec5584e | 3433 | .llseek = generic_file_llseek, \ |
68be3029 | 3434 | } |
acaefc25 | 3435 | |
b9075fa9 JP |
3436 | static inline __printf(1, 2) |
3437 | void __simple_attr_check_format(const char *fmt, ...) | |
acaefc25 AB |
3438 | { |
3439 | /* don't do anything, just let the compiler check the arguments; */ | |
3440 | } | |
3441 | ||
3442 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 3443 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 | 3444 | const char *fmt); |
74bedc4d | 3445 | int simple_attr_release(struct inode *inode, struct file *file); |
acaefc25 AB |
3446 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
3447 | size_t len, loff_t *ppos); | |
3448 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
3449 | size_t len, loff_t *ppos); | |
3450 | ||
4be28540 | 3451 | struct ctl_table; |
8d65af78 | 3452 | int proc_nr_files(struct ctl_table *table, int write, |
62239ac2 | 3453 | void __user *buffer, size_t *lenp, loff_t *ppos); |
312d3ca8 CH |
3454 | int proc_nr_dentry(struct ctl_table *table, int write, |
3455 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
cffbc8aa DC |
3456 | int proc_nr_inodes(struct ctl_table *table, int write, |
3457 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
38e23c95 | 3458 | int __init get_filesystem_list(char *buf); |
62239ac2 | 3459 | |
3cd90ea4 | 3460 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
1a44bc8c NK |
3461 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
3462 | ||
6d125529 | 3463 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
ecf081d1 | 3464 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
1a44bc8c | 3465 | (flag & __FMODE_NONOTIFY))) |
5300990c | 3466 | |
d37177ba | 3467 | static inline bool is_sxid(umode_t mode) |
69b45732 AK |
3468 | { |
3469 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); | |
3470 | } | |
3471 | ||
cbdf35bc MS |
3472 | static inline int check_sticky(struct inode *dir, struct inode *inode) |
3473 | { | |
3474 | if (!(dir->i_mode & S_ISVTX)) | |
3475 | return 0; | |
3476 | ||
3477 | return __check_sticky(dir, inode); | |
3478 | } | |
3479 | ||
69b45732 AK |
3480 | static inline void inode_has_no_xattr(struct inode *inode) |
3481 | { | |
e462ec50 | 3482 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC)) |
69b45732 AK |
3483 | inode->i_flags |= S_NOSEC; |
3484 | } | |
3485 | ||
a7400222 AV |
3486 | static inline bool is_root_inode(struct inode *inode) |
3487 | { | |
3488 | return inode == inode->i_sb->s_root->d_inode; | |
3489 | } | |
3490 | ||
5f99f4e7 AV |
3491 | static inline bool dir_emit(struct dir_context *ctx, |
3492 | const char *name, int namelen, | |
3493 | u64 ino, unsigned type) | |
3494 | { | |
3495 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; | |
3496 | } | |
3497 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) | |
3498 | { | |
3499 | return ctx->actor(ctx, ".", 1, ctx->pos, | |
3500 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; | |
3501 | } | |
3502 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) | |
3503 | { | |
3504 | return ctx->actor(ctx, "..", 2, ctx->pos, | |
3505 | parent_ino(file->f_path.dentry), DT_DIR) == 0; | |
3506 | } | |
3507 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) | |
3508 | { | |
3509 | if (ctx->pos == 0) { | |
3510 | if (!dir_emit_dot(file, ctx)) | |
3511 | return false; | |
3512 | ctx->pos = 1; | |
3513 | } | |
3514 | if (ctx->pos == 1) { | |
3515 | if (!dir_emit_dotdot(file, ctx)) | |
3516 | return false; | |
3517 | ctx->pos = 2; | |
3518 | } | |
3519 | return true; | |
3520 | } | |
5ded75ec AV |
3521 | static inline bool dir_relax(struct inode *inode) |
3522 | { | |
5955102c AV |
3523 | inode_unlock(inode); |
3524 | inode_lock(inode); | |
5ded75ec AV |
3525 | return !IS_DEADDIR(inode); |
3526 | } | |
5f99f4e7 | 3527 | |
ae05327a AV |
3528 | static inline bool dir_relax_shared(struct inode *inode) |
3529 | { | |
3530 | inode_unlock_shared(inode); | |
3531 | inode_lock_shared(inode); | |
3532 | return !IS_DEADDIR(inode); | |
3533 | } | |
3534 | ||
90f8572b | 3535 | extern bool path_noexec(const struct path *path); |
21fc61c7 | 3536 | extern void inode_nohighmem(struct inode *inode); |
90f8572b | 3537 | |
45cd0faa AG |
3538 | /* mm/fadvise.c */ |
3539 | extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len, | |
3540 | int advice); | |
3541 | ||
2b188cc1 JA |
3542 | #if defined(CONFIG_IO_URING) |
3543 | extern struct sock *io_uring_get_socket(struct file *file); | |
3544 | #else | |
3545 | static inline struct sock *io_uring_get_socket(struct file *file) | |
3546 | { | |
3547 | return NULL; | |
3548 | } | |
3549 | #endif | |
3550 | ||
1da177e4 | 3551 | #endif /* _LINUX_FS_H */ |