1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_FS_H |
3 | #define _LINUX_FS_H |
4 | |
5 | #include <linux/linkage.h> |
6 | #include <linux/wait_bit.h> |
7 | #include <linux/kdev_t.h> |
8 | #include <linux/dcache.h> |
9 | #include <linux/path.h> |
10 | #include <linux/stat.h> |
11 | #include <linux/cache.h> |
12 | #include <linux/list.h> |
13 | #include <linux/list_lru.h> |
14 | #include <linux/llist.h> |
15 | #include <linux/radix-tree.h> |
16 | #include <linux/xarray.h> |
17 | #include <linux/rbtree.h> |
18 | #include <linux/init.h> |
19 | #include <linux/pid.h> |
20 | #include <linux/bug.h> |
21 | #include <linux/mutex.h> |
22 | #include <linux/rwsem.h> |
23 | #include <linux/mm_types.h> |
24 | #include <linux/capability.h> |
25 | #include <linux/semaphore.h> |
26 | #include <linux/fcntl.h> |
27 | #include <linux/rculist_bl.h> |
28 | #include <linux/atomic.h> |
29 | #include <linux/shrinker.h> |
30 | #include <linux/migrate_mode.h> |
31 | #include <linux/uidgid.h> |
32 | #include <linux/lockdep.h> |
33 | #include <linux/percpu-rwsem.h> |
34 | #include <linux/workqueue.h> |
35 | #include <linux/delayed_call.h> |
36 | #include <linux/uuid.h> |
37 | #include <linux/errseq.h> |
38 | #include <linux/ioprio.h> |
39 | #include <linux/fs_types.h> |
40 | #include <linux/build_bug.h> |
41 | #include <linux/stddef.h> |
42 | #include <linux/mount.h> |
43 | #include <linux/cred.h> |
44 | #include <linux/mnt_idmapping.h> |
45 | #include <linux/slab.h> |
46 | |
47 | #include <asm/byteorder.h> |
48 | #include <uapi/linux/fs.h> |
49 | |
50 | struct backing_dev_info; |
51 | struct bdi_writeback; |
52 | struct bio; |
53 | struct io_comp_batch; |
54 | struct export_operations; |
55 | struct fiemap_extent_info; |
56 | struct hd_geometry; |
57 | struct iovec; |
58 | struct kiocb; |
59 | struct kobject; |
60 | struct pipe_inode_info; |
61 | struct poll_table_struct; |
62 | struct kstatfs; |
63 | struct vm_area_struct; |
64 | struct vfsmount; |
65 | struct cred; |
66 | struct swap_info_struct; |
67 | struct seq_file; |
68 | struct workqueue_struct; |
69 | struct iov_iter; |
70 | struct fscrypt_info; |
71 | struct fscrypt_operations; |
72 | struct fsverity_info; |
73 | struct fsverity_operations; |
74 | struct fs_context; |
75 | struct fs_parameter_spec; |
76 | struct fileattr; |
77 | struct iomap_ops; |
78 | |
79 | extern void __init inode_init(void); |
80 | extern void __init inode_init_early(void); |
81 | extern void __init files_init(void); |
82 | extern void __init files_maxfiles_init(void); |
83 | |
84 | extern unsigned long get_max_files(void); |
85 | extern unsigned int sysctl_nr_open; |
86 | |
87 | typedef __kernel_rwf_t rwf_t; |
88 | |
89 | struct buffer_head; |
90 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
91 | struct buffer_head *bh_result, int create); |
92 | typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
93 | ssize_t bytes, void *private); |
94 | |
95 | #define MAY_EXEC 0x00000001 |
96 | #define MAY_WRITE 0x00000002 |
97 | #define MAY_READ 0x00000004 |
98 | #define MAY_APPEND 0x00000008 |
99 | #define MAY_ACCESS 0x00000010 |
100 | #define MAY_OPEN 0x00000020 |
101 | #define MAY_CHDIR 0x00000040 |
102 | /* called from RCU mode, don't block */ |
103 | #define MAY_NOT_BLOCK 0x00000080 |
104 | |
105 | /* |
106 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
107 | * to O_WRONLY and O_RDWR via the strange trick in do_dentry_open() |
108 | */ |
109 | |
110 | /* file is open for reading */ |
111 | #define FMODE_READ ((__force fmode_t)0x1) |
112 | /* file is open for writing */ |
113 | #define FMODE_WRITE ((__force fmode_t)0x2) |
114 | /* file is seekable */ |
115 | #define FMODE_LSEEK ((__force fmode_t)0x4) |
116 | /* file can be accessed using pread */ |
117 | #define FMODE_PREAD ((__force fmode_t)0x8) |
118 | /* file can be accessed using pwrite */ |
119 | #define FMODE_PWRITE ((__force fmode_t)0x10) |
120 | /* File is opened for execution with sys_execve / sys_uselib */ |
121 | #define FMODE_EXEC ((__force fmode_t)0x20) |
122 | /* File is opened with O_NDELAY (only set for block devices) */ |
123 | #define FMODE_NDELAY ((__force fmode_t)0x40) |
124 | /* File is opened with O_EXCL (only set for block devices) */ |
125 | #define FMODE_EXCL ((__force fmode_t)0x80) |
126 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
127 | (specialy hack for floppy.c) */ |
128 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
129 | /* 32bit hashes as llseek() offset (for directories) */ |
130 | #define FMODE_32BITHASH ((__force fmode_t)0x200) |
131 | /* 64bit hashes as llseek() offset (for directories) */ |
132 | #define FMODE_64BITHASH ((__force fmode_t)0x400) |
133 | |
134 | /* |
135 | * Don't update ctime and mtime. |
136 | * |
137 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
138 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
139 | */ |
140 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
141 | |
142 | /* Expect random access pattern */ |
143 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
144 | |
145 | /* File is huge (eg. /dev/mem): treat loff_t as unsigned */ |
146 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
147 | |
148 | /* File is opened with O_PATH; almost nothing can be done with it */ |
149 | #define FMODE_PATH ((__force fmode_t)0x4000) |
150 | |
151 | /* File needs atomic accesses to f_pos */ |
152 | #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) |
153 | /* Write access to underlying fs */ |
154 | #define FMODE_WRITER ((__force fmode_t)0x10000) |
155 | /* Has read method(s) */ |
156 | #define FMODE_CAN_READ ((__force fmode_t)0x20000) |
157 | /* Has write method(s) */ |
158 | #define FMODE_CAN_WRITE ((__force fmode_t)0x40000) |
159 | |
160 | #define FMODE_OPENED ((__force fmode_t)0x80000) |
161 | #define FMODE_CREATED ((__force fmode_t)0x100000) |
162 | |
163 | /* File is stream-like */ |
164 | #define FMODE_STREAM ((__force fmode_t)0x200000) |
165 | |
166 | /* File supports DIRECT IO */ |
167 | #define FMODE_CAN_ODIRECT ((__force fmode_t)0x400000) |
168 | |
169 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
170 | #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) |
171 | |
172 | /* File is capable of returning -EAGAIN if I/O will block */ |
173 | #define FMODE_NOWAIT ((__force fmode_t)0x8000000) |
174 | |
175 | /* File represents mount that needs unmounting */ |
176 | #define FMODE_NEED_UNMOUNT ((__force fmode_t)0x10000000) |
177 | |
178 | /* File does not contribute to nr_files count */ |
179 | #define FMODE_NOACCOUNT ((__force fmode_t)0x20000000) |
180 | |
181 | /* File supports async buffered reads */ |
182 | #define FMODE_BUF_RASYNC ((__force fmode_t)0x40000000) |
183 | |
184 | /* File supports async nowait buffered writes */ |
185 | #define FMODE_BUF_WASYNC ((__force fmode_t)0x80000000) |
186 | |
187 | /* |
188 | * Attribute flags. These should be or-ed together to figure out what |
189 | * has been changed! |
190 | */ |
191 | #define ATTR_MODE (1 << 0) |
192 | #define ATTR_UID (1 << 1) |
193 | #define ATTR_GID (1 << 2) |
194 | #define ATTR_SIZE (1 << 3) |
195 | #define ATTR_ATIME (1 << 4) |
196 | #define ATTR_MTIME (1 << 5) |
197 | #define ATTR_CTIME (1 << 6) |
198 | #define ATTR_ATIME_SET (1 << 7) |
199 | #define ATTR_MTIME_SET (1 << 8) |
200 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
201 | #define ATTR_KILL_SUID (1 << 11) |
202 | #define ATTR_KILL_SGID (1 << 12) |
203 | #define ATTR_FILE (1 << 13) |
204 | #define ATTR_KILL_PRIV (1 << 14) |
205 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
206 | #define ATTR_TIMES_SET (1 << 16) |
207 | #define ATTR_TOUCH (1 << 17) |
208 | |
209 | /* |
210 | * Whiteout is represented by a char device. The following constants define the |
211 | * mode and device number to use. |
212 | */ |
213 | #define WHITEOUT_MODE 0 |
214 | #define WHITEOUT_DEV 0 |
215 | |
216 | /* |
217 | * This is the Inode Attributes structure, used for notify_change(). It |
218 | * uses the above definitions as flags, to know which values have changed. |
219 | * Also, in this manner, a Filesystem can look at only the values it cares |
220 | * about. Basically, these are the attributes that the VFS layer can |
221 | * request to change from the FS layer. |
222 | * |
223 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
224 | */ |
225 | struct iattr { |
226 | unsigned int ia_valid; |
227 | umode_t ia_mode; |
228 | /* |
229 | * The two anonymous unions wrap structures with the same member. |
230 | * |
231 | * Filesystems raising FS_ALLOW_IDMAP need to use ia_vfs{g,u}id which |
232 | * are a dedicated type requiring the filesystem to use the dedicated |
233 | * helpers. Other filesystem can continue to use ia_{g,u}id until they |
234 | * have been ported. |
235 | * |
236 | * They always contain the same value. In other words FS_ALLOW_IDMAP |
237 | * pass down the same value on idmapped mounts as they would on regular |
238 | * mounts. |
239 | */ |
240 | union { |
241 | kuid_t ia_uid; |
242 | vfsuid_t ia_vfsuid; |
243 | }; |
244 | union { |
245 | kgid_t ia_gid; |
246 | vfsgid_t ia_vfsgid; |
247 | }; |
248 | loff_t ia_size; |
249 | struct timespec64 ia_atime; |
250 | struct timespec64 ia_mtime; |
251 | struct timespec64 ia_ctime; |
252 | |
253 | /* |
254 | * Not an attribute, but an auxiliary info for filesystems wanting to |
255 | * implement an ftruncate() like method. NOTE: filesystem should |
256 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
257 | */ |
258 | struct file *ia_file; |
259 | }; |
260 | |
261 | /* |
262 | * Includes for diskquotas. |
263 | */ |
264 | #include <linux/quota.h> |
265 | |
266 | /* |
267 | * Maximum number of layers of fs stack. Needs to be limited to |
268 | * prevent kernel stack overflow |
269 | */ |
270 | #define FILESYSTEM_MAX_STACK_DEPTH 2 |
271 | |
272 | /** |
273 | * enum positive_aop_returns - aop return codes with specific semantics |
274 | * |
275 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
276 | * completed, that the page is still locked, and |
277 | * should be considered active. The VM uses this hint |
278 | * to return the page to the active list -- it won't |
279 | * be a candidate for writeback again in the near |
280 | * future. Other callers must be careful to unlock |
281 | * the page if they get this return. Returned by |
282 | * writepage(); |
283 | * |
284 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
285 | * unlocked it and the page might have been truncated. |
286 | * The caller should back up to acquiring a new page and |
287 | * trying again. The aop will be taking reasonable |
288 | * precautions not to livelock. If the caller held a page |
289 | * reference, it should drop it before retrying. Returned |
290 | * by read_folio(). |
291 | * |
292 | * address_space_operation functions return these large constants to indicate |
293 | * special semantics to the caller. These are much larger than the bytes in a |
294 | * page to allow for functions that return the number of bytes operated on in a |
295 | * given page. |
296 | */ |
297 | |
298 | enum positive_aop_returns { |
299 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
300 | AOP_TRUNCATED_PAGE = 0x80001, |
301 | }; |
302 | |
303 | /* |
304 | * oh the beauties of C type declarations. |
305 | */ |
306 | struct page; |
307 | struct address_space; |
308 | struct writeback_control; |
309 | struct readahead_control; |
310 | |
311 | /* |
312 | * Write life time hint values. |
313 | * Stored in struct inode as u8. |
314 | */ |
315 | enum rw_hint { |
316 | WRITE_LIFE_NOT_SET = 0, |
317 | WRITE_LIFE_NONE = RWH_WRITE_LIFE_NONE, |
318 | WRITE_LIFE_SHORT = RWH_WRITE_LIFE_SHORT, |
319 | WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, |
320 | WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, |
321 | WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, |
322 | }; |
323 | |
324 | /* Match RWF_* bits to IOCB bits */ |
325 | #define IOCB_HIPRI (__force int) RWF_HIPRI |
326 | #define IOCB_DSYNC (__force int) RWF_DSYNC |
327 | #define IOCB_SYNC (__force int) RWF_SYNC |
328 | #define IOCB_NOWAIT (__force int) RWF_NOWAIT |
329 | #define IOCB_APPEND (__force int) RWF_APPEND |
330 | |
331 | /* non-RWF related bits - start at 16 */ |
332 | #define IOCB_EVENTFD (1 << 16) |
333 | #define IOCB_DIRECT (1 << 17) |
334 | #define IOCB_WRITE (1 << 18) |
335 | /* iocb->ki_waitq is valid */ |
336 | #define IOCB_WAITQ (1 << 19) |
337 | #define IOCB_NOIO (1 << 20) |
338 | /* can use bio alloc cache */ |
339 | #define IOCB_ALLOC_CACHE (1 << 21) |
340 | |
341 | struct kiocb { |
342 | struct file *ki_filp; |
343 | loff_t ki_pos; |
344 | void (*ki_complete)(struct kiocb *iocb, long ret); |
345 | void *private; |
346 | int ki_flags; |
347 | u16 ki_ioprio; /* See linux/ioprio.h */ |
348 | struct wait_page_queue *ki_waitq; /* for async buffered IO */ |
349 | }; |
350 | |
351 | static inline bool is_sync_kiocb(struct kiocb *kiocb) |
352 | { |
353 | return kiocb->ki_complete == NULL; |
354 | } |
355 | |
356 | struct address_space_operations { |
357 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
358 | int (*read_folio)(struct file *, struct folio *); |
359 | |
360 | /* Write back some dirty pages from this mapping. */ |
361 | int (*writepages)(struct address_space *, struct writeback_control *); |
362 | |
363 | /* Mark a folio dirty. Return true if this dirtied it */ |
364 | bool (*dirty_folio)(struct address_space *, struct folio *); |
365 | |
366 | void (*readahead)(struct readahead_control *); |
367 | |
368 | int (*write_begin)(struct file *, struct address_space *mapping, |
369 | loff_t pos, unsigned len, |
370 | struct page **pagep, void **fsdata); |
371 | int (*write_end)(struct file *, struct address_space *mapping, |
372 | loff_t pos, unsigned len, unsigned copied, |
373 | struct page *page, void *fsdata); |
374 | |
375 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
376 | sector_t (*bmap)(struct address_space *, sector_t); |
377 | void (*invalidate_folio) (struct folio *, size_t offset, size_t len); |
378 | bool (*release_folio)(struct folio *, gfp_t); |
379 | void (*free_folio)(struct folio *folio); |
380 | ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); |
381 | /* |
382 | * migrate the contents of a folio to the specified target. If |
383 | * migrate_mode is MIGRATE_ASYNC, it must not block. |
384 | */ |
385 | int (*migrate_folio)(struct address_space *, struct folio *dst, |
386 | struct folio *src, enum migrate_mode); |
387 | int (*launder_folio)(struct folio *); |
388 | bool (*is_partially_uptodate) (struct folio *, size_t from, |
389 | size_t count); |
390 | void (*is_dirty_writeback) (struct folio *, bool *dirty, bool *wb); |
391 | int (*error_remove_page)(struct address_space *, struct page *); |
392 | |
393 | /* swapfile support */ |
394 | int (*swap_activate)(struct swap_info_struct *sis, struct file *file, |
395 | sector_t *span); |
396 | void (*swap_deactivate)(struct file *file); |
397 | int (*swap_rw)(struct kiocb *iocb, struct iov_iter *iter); |
398 | }; |
399 | |
400 | extern const struct address_space_operations empty_aops; |
401 | |
402 | /** |
403 | * struct address_space - Contents of a cacheable, mappable object. |
404 | * @host: Owner, either the inode or the block_device. |
405 | * @i_pages: Cached pages. |
406 | * @invalidate_lock: Guards coherency between page cache contents and |
407 | * file offset->disk block mappings in the filesystem during invalidates. |
408 | * It is also used to block modification of page cache contents through |
409 | * memory mappings. |
410 | * @gfp_mask: Memory allocation flags to use for allocating pages. |
411 | * @i_mmap_writable: Number of VM_SHARED mappings. |
412 | * @nr_thps: Number of THPs in the pagecache (non-shmem only). |
413 | * @i_mmap: Tree of private and shared mappings. |
414 | * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable. |
415 | * @nrpages: Number of page entries, protected by the i_pages lock. |
416 | * @writeback_index: Writeback starts here. |
417 | * @a_ops: Methods. |
418 | * @flags: Error bits and flags (AS_*). |
419 | * @wb_err: The most recent error which has occurred. |
420 | * @private_lock: For use by the owner of the address_space. |
421 | * @private_list: For use by the owner of the address_space. |
422 | * @private_data: For use by the owner of the address_space. |
423 | */ |
424 | struct address_space { |
425 | struct inode *host; |
426 | struct xarray i_pages; |
427 | struct rw_semaphore invalidate_lock; |
428 | gfp_t gfp_mask; |
429 | atomic_t i_mmap_writable; |
430 | #ifdef CONFIG_READ_ONLY_THP_FOR_FS |
431 | /* number of thp, only for non-shmem files */ |
432 | atomic_t nr_thps; |
433 | #endif |
434 | struct rb_root_cached i_mmap; |
435 | struct rw_semaphore i_mmap_rwsem; |
436 | unsigned long nrpages; |
437 | pgoff_t writeback_index; |
438 | const struct address_space_operations *a_ops; |
439 | unsigned long flags; |
440 | errseq_t wb_err; |
441 | spinlock_t private_lock; |
442 | struct list_head private_list; |
443 | void *private_data; |
444 | } __attribute__((aligned(sizeof(long)))) __randomize_layout; |
445 | /* |
446 | * On most architectures that alignment is already the case; but |
447 | * must be enforced here for CRIS, to let the least significant bit |
448 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
449 | */ |
450 | |
451 | /* XArray tags, for tagging dirty and writeback pages in the pagecache. */ |
452 | #define PAGECACHE_TAG_DIRTY XA_MARK_0 |
453 | #define PAGECACHE_TAG_WRITEBACK XA_MARK_1 |
454 | #define PAGECACHE_TAG_TOWRITE XA_MARK_2 |
455 | |
456 | /* |
457 | * Returns true if any of the pages in the mapping are marked with the tag. |
458 | */ |
459 | static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag) |
460 | { |
461 | return xa_marked(&mapping->i_pages, tag); |
462 | } |
463 | |
464 | static inline void i_mmap_lock_write(struct address_space *mapping) |
465 | { |
466 | down_write(&mapping->i_mmap_rwsem); |
467 | } |
468 | |
469 | static inline int i_mmap_trylock_write(struct address_space *mapping) |
470 | { |
471 | return down_write_trylock(&mapping->i_mmap_rwsem); |
472 | } |
473 | |
474 | static inline void i_mmap_unlock_write(struct address_space *mapping) |
475 | { |
476 | up_write(&mapping->i_mmap_rwsem); |
477 | } |
478 | |
479 | static inline int i_mmap_trylock_read(struct address_space *mapping) |
480 | { |
481 | return down_read_trylock(&mapping->i_mmap_rwsem); |
482 | } |
483 | |
484 | static inline void i_mmap_lock_read(struct address_space *mapping) |
485 | { |
486 | down_read(&mapping->i_mmap_rwsem); |
487 | } |
488 | |
489 | static inline void i_mmap_unlock_read(struct address_space *mapping) |
490 | { |
491 | up_read(&mapping->i_mmap_rwsem); |
492 | } |
493 | |
494 | static inline void i_mmap_assert_locked(struct address_space *mapping) |
495 | { |
496 | lockdep_assert_held(&mapping->i_mmap_rwsem); |
497 | } |
498 | |
499 | static inline void i_mmap_assert_write_locked(struct address_space *mapping) |
500 | { |
501 | lockdep_assert_held_write(&mapping->i_mmap_rwsem); |
502 | } |
503 | |
504 | /* |
505 | * Might pages of this file be mapped into userspace? |
506 | */ |
507 | static inline int mapping_mapped(struct address_space *mapping) |
508 | { |
509 | return !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root); |
510 | } |
511 | |
512 | /* |
513 | * Might pages of this file have been modified in userspace? |
514 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap |
515 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
516 | * writing i.e. vma may be mprotected writable even if now readonly. |
517 | * |
518 | * If i_mmap_writable is negative, no new writable mappings are allowed. You |
519 | * can only deny writable mappings, if none exists right now. |
520 | */ |
521 | static inline int mapping_writably_mapped(struct address_space *mapping) |
522 | { |
523 | return atomic_read(&mapping->i_mmap_writable) > 0; |
524 | } |
525 | |
526 | static inline int mapping_map_writable(struct address_space *mapping) |
527 | { |
528 | return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? |
529 | 0 : -EPERM; |
530 | } |
531 | |
532 | static inline void mapping_unmap_writable(struct address_space *mapping) |
533 | { |
534 | atomic_dec(&mapping->i_mmap_writable); |
535 | } |
536 | |
537 | static inline int mapping_deny_writable(struct address_space *mapping) |
538 | { |
539 | return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? |
540 | 0 : -EBUSY; |
541 | } |
542 | |
543 | static inline void mapping_allow_writable(struct address_space *mapping) |
544 | { |
545 | atomic_inc(&mapping->i_mmap_writable); |
546 | } |
547 | |
548 | /* |
549 | * Use sequence counter to get consistent i_size on 32-bit processors. |
550 | */ |
551 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
552 | #include <linux/seqlock.h> |
553 | #define __NEED_I_SIZE_ORDERED |
554 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
555 | #else |
556 | #define i_size_ordered_init(inode) do { } while (0) |
557 | #endif |
558 | |
559 | struct posix_acl; |
560 | #define ACL_NOT_CACHED ((void *)(-1)) |
561 | /* |
562 | * ACL_DONT_CACHE is for stacked filesystems, that rely on underlying fs to |
563 | * cache the ACL. This also means that ->get_acl() can be called in RCU mode |
564 | * with the LOOKUP_RCU flag. |
565 | */ |
566 | #define ACL_DONT_CACHE ((void *)(-3)) |
567 | |
568 | static inline struct posix_acl * |
569 | uncached_acl_sentinel(struct task_struct *task) |
570 | { |
571 | return (void *)task + 1; |
572 | } |
573 | |
574 | static inline bool |
575 | is_uncached_acl(struct posix_acl *acl) |
576 | { |
577 | return (long)acl & 1; |
578 | } |
579 | |
580 | #define IOP_FASTPERM 0x0001 |
581 | #define IOP_LOOKUP 0x0002 |
582 | #define IOP_NOFOLLOW 0x0004 |
583 | #define IOP_XATTR 0x0008 |
584 | #define IOP_DEFAULT_READLINK 0x0010 |
585 | |
586 | struct fsnotify_mark_connector; |
587 | |
588 | /* |
589 | * Keep mostly read-only and often accessed (especially for |
590 | * the RCU path lookup and 'stat' data) fields at the beginning |
591 | * of the 'struct inode' |
592 | */ |
593 | struct inode { |
594 | umode_t i_mode; |
595 | unsigned short i_opflags; |
596 | kuid_t i_uid; |
597 | kgid_t i_gid; |
598 | unsigned int i_flags; |
599 | |
600 | #ifdef CONFIG_FS_POSIX_ACL |
601 | struct posix_acl *i_acl; |
602 | struct posix_acl *i_default_acl; |
603 | #endif |
604 | |
605 | const struct inode_operations *i_op; |
606 | struct super_block *i_sb; |
607 | struct address_space *i_mapping; |
608 | |
609 | #ifdef CONFIG_SECURITY |
610 | void *i_security; |
611 | #endif |
612 | |
613 | /* Stat data, not accessed from path walking */ |
614 | unsigned long i_ino; |
615 | /* |
616 | * Filesystems may only read i_nlink directly. They shall use the |
617 | * following functions for modification: |
618 | * |
619 | * (set|clear|inc|drop)_nlink |
620 | * inode_(inc|dec)_link_count |
621 | */ |
622 | union { |
623 | const unsigned int i_nlink; |
624 | unsigned int __i_nlink; |
625 | }; |
626 | dev_t i_rdev; |
627 | loff_t i_size; |
628 | struct timespec64 i_atime; |
629 | struct timespec64 i_mtime; |
630 | struct timespec64 i_ctime; |
631 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
632 | unsigned short i_bytes; |
633 | u8 i_blkbits; |
634 | u8 i_write_hint; |
635 | blkcnt_t i_blocks; |
636 | |
637 | #ifdef __NEED_I_SIZE_ORDERED |
638 | seqcount_t i_size_seqcount; |
639 | #endif |
640 | |
641 | /* Misc */ |
642 | unsigned long i_state; |
643 | struct rw_semaphore i_rwsem; |
644 | |
645 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
646 | unsigned long dirtied_time_when; |
647 | |
648 | struct hlist_node i_hash; |
649 | struct list_head i_io_list; /* backing dev IO list */ |
650 | #ifdef CONFIG_CGROUP_WRITEBACK |
651 | struct bdi_writeback *i_wb; /* the associated cgroup wb */ |
652 | |
653 | /* foreign inode detection, see wbc_detach_inode() */ |
654 | int i_wb_frn_winner; |
655 | u16 i_wb_frn_avg_time; |
656 | u16 i_wb_frn_history; |
657 | #endif |
658 | struct list_head i_lru; /* inode LRU list */ |
659 | struct list_head i_sb_list; |
660 | struct list_head i_wb_list; /* backing dev writeback list */ |
661 | union { |
662 | struct hlist_head i_dentry; |
663 | struct rcu_head i_rcu; |
664 | }; |
665 | atomic64_t i_version; |
666 | atomic64_t i_sequence; /* see futex */ |
667 | atomic_t i_count; |
668 | atomic_t i_dio_count; |
669 | atomic_t i_writecount; |
670 | #if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING) |
671 | atomic_t i_readcount; /* struct files open RO */ |
672 | #endif |
673 | union { |
674 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
675 | void (*free_inode)(struct inode *); |
676 | }; |
677 | struct file_lock_context *i_flctx; |
678 | struct address_space i_data; |
679 | struct list_head i_devices; |
680 | union { |
681 | struct pipe_inode_info *i_pipe; |
682 | struct cdev *i_cdev; |
683 | char *i_link; |
684 | unsigned i_dir_seq; |
685 | }; |
686 | |
687 | __u32 i_generation; |
688 | |
689 | #ifdef CONFIG_FSNOTIFY |
690 | __u32 i_fsnotify_mask; /* all events this inode cares about */ |
691 | struct fsnotify_mark_connector __rcu *i_fsnotify_marks; |
692 | #endif |
693 | |
694 | #ifdef CONFIG_FS_ENCRYPTION |
695 | struct fscrypt_info *i_crypt_info; |
696 | #endif |
697 | |
698 | #ifdef CONFIG_FS_VERITY |
699 | struct fsverity_info *i_verity_info; |
700 | #endif |
701 | |
702 | void *i_private; /* fs or device private pointer */ |
703 | } __randomize_layout; |
704 | |
705 | struct timespec64 timestamp_truncate(struct timespec64 t, struct inode *inode); |
706 | |
707 | static inline unsigned int i_blocksize(const struct inode *node) |
708 | { |
709 | return (1 << node->i_blkbits); |
710 | } |
711 | |
712 | static inline int inode_unhashed(struct inode *inode) |
713 | { |
714 | return hlist_unhashed(&inode->i_hash); |
715 | } |
716 | |
717 | /* |
718 | * __mark_inode_dirty expects inodes to be hashed. Since we don't |
719 | * want special inodes in the fileset inode space, we make them |
720 | * appear hashed, but do not put on any lists. hlist_del() |
721 | * will work fine and require no locking. |
722 | */ |
723 | static inline void inode_fake_hash(struct inode *inode) |
724 | { |
725 | hlist_add_fake(&inode->i_hash); |
726 | } |
727 | |
728 | /* |
729 | * inode->i_mutex nesting subclasses for the lock validator: |
730 | * |
731 | * 0: the object of the current VFS operation |
732 | * 1: parent |
733 | * 2: child/target |
734 | * 3: xattr |
735 | * 4: second non-directory |
736 | * 5: second parent (when locking independent directories in rename) |
737 | * |
738 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two |
739 | * non-directories at once. |
740 | * |
741 | * The locking order between these classes is |
742 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
743 | */ |
744 | enum inode_i_mutex_lock_class |
745 | { |
746 | I_MUTEX_NORMAL, |
747 | I_MUTEX_PARENT, |
748 | I_MUTEX_CHILD, |
749 | I_MUTEX_XATTR, |
750 | I_MUTEX_NONDIR2, |
751 | I_MUTEX_PARENT2, |
752 | }; |
753 | |
754 | static inline void inode_lock(struct inode *inode) |
755 | { |
756 | down_write(&inode->i_rwsem); |
757 | } |
758 | |
759 | static inline void inode_unlock(struct inode *inode) |
760 | { |
761 | up_write(&inode->i_rwsem); |
762 | } |
763 | |
764 | static inline void inode_lock_shared(struct inode *inode) |
765 | { |
766 | down_read(&inode->i_rwsem); |
767 | } |
768 | |
769 | static inline void inode_unlock_shared(struct inode *inode) |
770 | { |
771 | up_read(&inode->i_rwsem); |
772 | } |
773 | |
774 | static inline int inode_trylock(struct inode *inode) |
775 | { |
776 | return down_write_trylock(&inode->i_rwsem); |
777 | } |
778 | |
779 | static inline int inode_trylock_shared(struct inode *inode) |
780 | { |
781 | return down_read_trylock(&inode->i_rwsem); |
782 | } |
783 | |
784 | static inline int inode_is_locked(struct inode *inode) |
785 | { |
786 | return rwsem_is_locked(&inode->i_rwsem); |
787 | } |
788 | |
789 | static inline void inode_lock_nested(struct inode *inode, unsigned subclass) |
790 | { |
791 | down_write_nested(&inode->i_rwsem, subclass); |
792 | } |
793 | |
794 | static inline void inode_lock_shared_nested(struct inode *inode, unsigned subclass) |
795 | { |
796 | down_read_nested(&inode->i_rwsem, subclass); |
797 | } |
798 | |
799 | static inline void filemap_invalidate_lock(struct address_space *mapping) |
800 | { |
801 | down_write(&mapping->invalidate_lock); |
802 | } |
803 | |
804 | static inline void filemap_invalidate_unlock(struct address_space *mapping) |
805 | { |
806 | up_write(&mapping->invalidate_lock); |
807 | } |
808 | |
809 | static inline void filemap_invalidate_lock_shared(struct address_space *mapping) |
810 | { |
811 | down_read(&mapping->invalidate_lock); |
812 | } |
813 | |
814 | static inline int filemap_invalidate_trylock_shared( |
815 | struct address_space *mapping) |
816 | { |
817 | return down_read_trylock(&mapping->invalidate_lock); |
818 | } |
819 | |
820 | static inline void filemap_invalidate_unlock_shared( |
821 | struct address_space *mapping) |
822 | { |
823 | up_read(&mapping->invalidate_lock); |
824 | } |
825 | |
826 | void lock_two_nondirectories(struct inode *, struct inode*); |
827 | void unlock_two_nondirectories(struct inode *, struct inode*); |
828 | |
829 | void filemap_invalidate_lock_two(struct address_space *mapping1, |
830 | struct address_space *mapping2); |
831 | void filemap_invalidate_unlock_two(struct address_space *mapping1, |
832 | struct address_space *mapping2); |
833 | |
834 | |
835 | /* |
836 | * NOTE: in a 32bit arch with a preemptable kernel and |
837 | * an UP compile the i_size_read/write must be atomic |
838 | * with respect to the local cpu (unlike with preempt disabled), |
839 | * but they don't need to be atomic with respect to other cpus like in |
840 | * true SMP (so they need either to either locally disable irq around |
841 | * the read or for example on x86 they can be still implemented as a |
842 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
843 | * and 64bit archs it makes no difference if preempt is enabled or not. |
844 | */ |
845 | static inline loff_t i_size_read(const struct inode *inode) |
846 | { |
847 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
848 | loff_t i_size; |
849 | unsigned int seq; |
850 | |
851 | do { |
852 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
853 | i_size = inode->i_size; |
854 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
855 | return i_size; |
856 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) |
857 | loff_t i_size; |
858 | |
859 | preempt_disable(); |
860 | i_size = inode->i_size; |
861 | preempt_enable(); |
862 | return i_size; |
863 | #else |
864 | return inode->i_size; |
865 | #endif |
866 | } |
867 | |
868 | /* |
869 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
870 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
871 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
872 | */ |
873 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
874 | { |
875 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
876 | preempt_disable(); |
877 | write_seqcount_begin(&inode->i_size_seqcount); |
878 | inode->i_size = i_size; |
879 | write_seqcount_end(&inode->i_size_seqcount); |
880 | preempt_enable(); |
881 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) |
882 | preempt_disable(); |
883 | inode->i_size = i_size; |
884 | preempt_enable(); |
885 | #else |
886 | inode->i_size = i_size; |
887 | #endif |
888 | } |
889 | |
890 | static inline unsigned iminor(const struct inode *inode) |
891 | { |
892 | return MINOR(inode->i_rdev); |
893 | } |
894 | |
895 | static inline unsigned imajor(const struct inode *inode) |
896 | { |
897 | return MAJOR(inode->i_rdev); |
898 | } |
899 | |
900 | struct fown_struct { |
901 | rwlock_t lock; /* protects pid, uid, euid fields */ |
902 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
903 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ |
904 | kuid_t uid, euid; /* uid/euid of process setting the owner */ |
905 | int signum; /* posix.1b rt signal to be delivered on IO */ |
906 | }; |
907 | |
908 | /** |
909 | * struct file_ra_state - Track a file's readahead state. |
910 | * @start: Where the most recent readahead started. |
911 | * @size: Number of pages read in the most recent readahead. |
912 | * @async_size: Numer of pages that were/are not needed immediately |
913 | * and so were/are genuinely "ahead". Start next readahead when |
914 | * the first of these pages is accessed. |
915 | * @ra_pages: Maximum size of a readahead request, copied from the bdi. |
916 | * @mmap_miss: How many mmap accesses missed in the page cache. |
917 | * @prev_pos: The last byte in the most recent read request. |
918 | * |
919 | * When this structure is passed to ->readahead(), the "most recent" |
920 | * readahead means the current readahead. |
921 | */ |
922 | struct file_ra_state { |
923 | pgoff_t start; |
924 | unsigned int size; |
925 | unsigned int async_size; |
926 | unsigned int ra_pages; |
927 | unsigned int mmap_miss; |
928 | loff_t prev_pos; |
929 | }; |
930 | |
931 | /* |
932 | * Check if @index falls in the readahead windows. |
933 | */ |
934 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
935 | { |
936 | return (index >= ra->start && |
937 | index < ra->start + ra->size); |
938 | } |
939 | |
940 | struct file { |
941 | union { |
942 | struct llist_node f_llist; |
943 | struct rcu_head f_rcuhead; |
944 | unsigned int f_iocb_flags; |
945 | }; |
946 | struct path f_path; |
947 | struct inode *f_inode; /* cached value */ |
948 | const struct file_operations *f_op; |
949 | |
950 | /* |
951 | * Protects f_ep, f_flags. |
952 | * Must not be taken from IRQ context. |
953 | */ |
954 | spinlock_t f_lock; |
955 | atomic_long_t f_count; |
956 | unsigned int f_flags; |
957 | fmode_t f_mode; |
958 | struct mutex f_pos_lock; |
959 | loff_t f_pos; |
960 | struct fown_struct f_owner; |
961 | const struct cred *f_cred; |
962 | struct file_ra_state f_ra; |
963 | |
964 | u64 f_version; |
965 | #ifdef CONFIG_SECURITY |
966 | void *f_security; |
967 | #endif |
968 | /* needed for tty driver, and maybe others */ |
969 | void *private_data; |
970 | |
971 | #ifdef CONFIG_EPOLL |
972 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
973 | struct hlist_head *f_ep; |
974 | #endif /* #ifdef CONFIG_EPOLL */ |
975 | struct address_space *f_mapping; |
976 | errseq_t f_wb_err; |
977 | errseq_t f_sb_err; /* for syncfs */ |
978 | } __randomize_layout |
979 | __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
980 | |
981 | struct file_handle { |
982 | __u32 handle_bytes; |
983 | int handle_type; |
984 | /* file identifier */ |
985 | unsigned char f_handle[]; |
986 | }; |
987 | |
988 | static inline struct file *get_file(struct file *f) |
989 | { |
990 | atomic_long_inc(&f->f_count); |
991 | return f; |
992 | } |
993 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
994 | #define file_count(x) atomic_long_read(&(x)->f_count) |
995 | |
996 | #define MAX_NON_LFS ((1UL<<31) - 1) |
997 | |
998 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
999 | limits, otherwise bad things can happen in VM. */ |
1000 | #if BITS_PER_LONG==32 |
1001 | #define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT) |
1002 | #elif BITS_PER_LONG==64 |
1003 | #define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX) |
1004 | #endif |
1005 | |
1006 | #define FL_POSIX 1 |
1007 | #define FL_FLOCK 2 |
1008 | #define FL_DELEG 4 /* NFSv4 delegation */ |
1009 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
1010 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
1011 | #define FL_LEASE 32 /* lease held on this file */ |
1012 | #define FL_CLOSE 64 /* unlock on close */ |
1013 | #define FL_SLEEP 128 /* A blocking lock */ |
1014 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
1015 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
1016 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
1017 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
1018 | #define FL_RECLAIM 4096 /* reclaiming from a reboot server */ |
1019 | |
1020 | #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE) |
1021 | |
1022 | /* |
1023 | * Special return value from posix_lock_file() and vfs_lock_file() for |
1024 | * asynchronous locking. |
1025 | */ |
1026 | #define FILE_LOCK_DEFERRED 1 |
1027 | |
1028 | /* legacy typedef, should eventually be removed */ |
1029 | typedef void *fl_owner_t; |
1030 | |
1031 | struct file_lock; |
1032 | |
1033 | struct file_lock_operations { |
1034 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
1035 | void (*fl_release_private)(struct file_lock *); |
1036 | }; |
1037 | |
1038 | struct lock_manager_operations { |
1039 | void *lm_mod_owner; |
1040 | fl_owner_t (*lm_get_owner)(fl_owner_t); |
1041 | void (*lm_put_owner)(fl_owner_t); |
1042 | void (*lm_notify)(struct file_lock *); /* unblock callback */ |
1043 | int (*lm_grant)(struct file_lock *, int); |
1044 | bool (*lm_break)(struct file_lock *); |
1045 | int (*lm_change)(struct file_lock *, int, struct list_head *); |
1046 | void (*lm_setup)(struct file_lock *, void **); |
1047 | bool (*lm_breaker_owns_lease)(struct file_lock *); |
1048 | bool (*lm_lock_expirable)(struct file_lock *cfl); |
1049 | void (*lm_expire_lock)(void); |
1050 | }; |
1051 | |
1052 | struct lock_manager { |
1053 | struct list_head list; |
1054 | /* |
1055 | * NFSv4 and up also want opens blocked during the grace period; |
1056 | * NLM doesn't care: |
1057 | */ |
1058 | bool block_opens; |
1059 | }; |
1060 | |
1061 | struct net; |
1062 | void locks_start_grace(struct net *, struct lock_manager *); |
1063 | void locks_end_grace(struct lock_manager *); |
1064 | bool locks_in_grace(struct net *); |
1065 | bool opens_in_grace(struct net *); |
1066 | |
1067 | /* that will die - we need it for nfs_lock_info */ |
1068 | #include <linux/nfs_fs_i.h> |
1069 | |
1070 | /* |
1071 | * struct file_lock represents a generic "file lock". It's used to represent |
1072 | * POSIX byte range locks, BSD (flock) locks, and leases. It's important to |
1073 | * note that the same struct is used to represent both a request for a lock and |
1074 | * the lock itself, but the same object is never used for both. |
1075 | * |
1076 | * FIXME: should we create a separate "struct lock_request" to help distinguish |
1077 | * these two uses? |
1078 | * |
1079 | * The varous i_flctx lists are ordered by: |
1080 | * |
1081 | * 1) lock owner |
1082 | * 2) lock range start |
1083 | * 3) lock range end |
1084 | * |
1085 | * Obviously, the last two criteria only matter for POSIX locks. |
1086 | */ |
1087 | struct file_lock { |
1088 | struct file_lock *fl_blocker; /* The lock, that is blocking us */ |
1089 | struct list_head fl_list; /* link into file_lock_context */ |
1090 | struct hlist_node fl_link; /* node in global lists */ |
1091 | struct list_head fl_blocked_requests; /* list of requests with |
1092 | * ->fl_blocker pointing here |
1093 | */ |
1094 | struct list_head fl_blocked_member; /* node in |
1095 | * ->fl_blocker->fl_blocked_requests |
1096 | */ |
1097 | fl_owner_t fl_owner; |
1098 | unsigned int fl_flags; |
1099 | unsigned char fl_type; |
1100 | unsigned int fl_pid; |
1101 | int fl_link_cpu; /* what cpu's list is this on? */ |
1102 | wait_queue_head_t fl_wait; |
1103 | struct file *fl_file; |
1104 | loff_t fl_start; |
1105 | loff_t fl_end; |
1106 | |
1107 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
1108 | /* for lease breaks: */ |
1109 | unsigned long fl_break_time; |
1110 | unsigned long fl_downgrade_time; |
1111 | |
1112 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
1113 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
1114 | union { |
1115 | struct nfs_lock_info nfs_fl; |
1116 | struct nfs4_lock_info nfs4_fl; |
1117 | struct { |
1118 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
1119 | int state; /* state of grant or error if -ve */ |
1120 | unsigned int debug_id; |
1121 | } afs; |
1122 | } fl_u; |
1123 | } __randomize_layout; |
1124 | |
1125 | struct file_lock_context { |
1126 | spinlock_t flc_lock; |
1127 | struct list_head flc_flock; |
1128 | struct list_head flc_posix; |
1129 | struct list_head flc_lease; |
1130 | }; |
1131 | |
1132 | /* The following constant reflects the upper bound of the file/locking space */ |
1133 | #ifndef OFFSET_MAX |
1134 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
1135 | #define OFFSET_MAX INT_LIMIT(loff_t) |
1136 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
1137 | #endif |
1138 | |
1139 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
1140 | |
1141 | #define locks_inode(f) file_inode(f) |
1142 | |
1143 | #ifdef CONFIG_FILE_LOCKING |
1144 | extern int fcntl_getlk(struct file *, unsigned int, struct flock *); |
1145 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
1146 | struct flock *); |
1147 | |
1148 | #if BITS_PER_LONG == 32 |
1149 | extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *); |
1150 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
1151 | struct flock64 *); |
1152 | #endif |
1153 | |
1154 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
1155 | extern int fcntl_getlease(struct file *filp); |
1156 | |
1157 | /* fs/locks.c */ |
1158 | void locks_free_lock_context(struct inode *inode); |
1159 | void locks_free_lock(struct file_lock *fl); |
1160 | extern void locks_init_lock(struct file_lock *); |
1161 | extern struct file_lock * locks_alloc_lock(void); |
1162 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
1163 | extern void locks_copy_conflock(struct file_lock *, struct file_lock *); |
1164 | extern void locks_remove_posix(struct file *, fl_owner_t); |
1165 | extern void locks_remove_file(struct file *); |
1166 | extern void locks_release_private(struct file_lock *); |
1167 | extern void posix_test_lock(struct file *, struct file_lock *); |
1168 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
1169 | extern int locks_delete_block(struct file_lock *); |
1170 | extern int vfs_test_lock(struct file *, struct file_lock *); |
1171 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
1172 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
1173 | extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl); |
1174 | extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); |
1175 | extern void lease_get_mtime(struct inode *, struct timespec64 *time); |
1176 | extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); |
1177 | extern int vfs_setlease(struct file *, long, struct file_lock **, void **); |
1178 | extern int lease_modify(struct file_lock *, int, struct list_head *); |
1179 | |
1180 | struct notifier_block; |
1181 | extern int lease_register_notifier(struct notifier_block *); |
1182 | extern void lease_unregister_notifier(struct notifier_block *); |
1183 | |
1184 | struct files_struct; |
1185 | extern void show_fd_locks(struct seq_file *f, |
1186 | struct file *filp, struct files_struct *files); |
1187 | extern bool locks_owner_has_blockers(struct file_lock_context *flctx, |
1188 | fl_owner_t owner); |
1189 | #else /* !CONFIG_FILE_LOCKING */ |
1190 | static inline int fcntl_getlk(struct file *file, unsigned int cmd, |
1191 | struct flock __user *user) |
1192 | { |
1193 | return -EINVAL; |
1194 | } |
1195 | |
1196 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
1197 | unsigned int cmd, struct flock __user *user) |
1198 | { |
1199 | return -EACCES; |
1200 | } |
1201 | |
1202 | #if BITS_PER_LONG == 32 |
1203 | static inline int fcntl_getlk64(struct file *file, unsigned int cmd, |
1204 | struct flock64 *user) |
1205 | { |
1206 | return -EINVAL; |
1207 | } |
1208 | |
1209 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
1210 | unsigned int cmd, struct flock64 *user) |
1211 | { |
1212 | return -EACCES; |
1213 | } |
1214 | #endif |
1215 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
1216 | { |
1217 | return -EINVAL; |
1218 | } |
1219 | |
1220 | static inline int fcntl_getlease(struct file *filp) |
1221 | { |
1222 | return F_UNLCK; |
1223 | } |
1224 | |
1225 | static inline void |
1226 | locks_free_lock_context(struct inode *inode) |
1227 | { |
1228 | } |
1229 | |
1230 | static inline void locks_init_lock(struct file_lock *fl) |
1231 | { |
1232 | return; |
1233 | } |
1234 | |
1235 | static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) |
1236 | { |
1237 | return; |
1238 | } |
1239 | |
1240 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
1241 | { |
1242 | return; |
1243 | } |
1244 | |
1245 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
1246 | { |
1247 | return; |
1248 | } |
1249 | |
1250 | static inline void locks_remove_file(struct file *filp) |
1251 | { |
1252 | return; |
1253 | } |
1254 | |
1255 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
1256 | { |
1257 | return; |
1258 | } |
1259 | |
1260 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
1261 | struct file_lock *conflock) |
1262 | { |
1263 | return -ENOLCK; |
1264 | } |
1265 | |
1266 | static inline int locks_delete_block(struct file_lock *waiter) |
1267 | { |
1268 | return -ENOENT; |
1269 | } |
1270 | |
1271 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
1272 | { |
1273 | return 0; |
1274 | } |
1275 | |
1276 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
1277 | struct file_lock *fl, struct file_lock *conf) |
1278 | { |
1279 | return -ENOLCK; |
1280 | } |
1281 | |
1282 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
1283 | { |
1284 | return 0; |
1285 | } |
1286 | |
1287 | static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl) |
1288 | { |
1289 | return -ENOLCK; |
1290 | } |
1291 | |
1292 | static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) |
1293 | { |
1294 | return 0; |
1295 | } |
1296 | |
1297 | static inline void lease_get_mtime(struct inode *inode, |
1298 | struct timespec64 *time) |
1299 | { |
1300 | return; |
1301 | } |
1302 | |
1303 | static inline int generic_setlease(struct file *filp, long arg, |
1304 | struct file_lock **flp, void **priv) |
1305 | { |
1306 | return -EINVAL; |
1307 | } |
1308 | |
1309 | static inline int vfs_setlease(struct file *filp, long arg, |
1310 | struct file_lock **lease, void **priv) |
1311 | { |
1312 | return -EINVAL; |
1313 | } |
1314 | |
1315 | static inline int lease_modify(struct file_lock *fl, int arg, |
1316 | struct list_head *dispose) |
1317 | { |
1318 | return -EINVAL; |
1319 | } |
1320 | |
1321 | struct files_struct; |
1322 | static inline void show_fd_locks(struct seq_file *f, |
1323 | struct file *filp, struct files_struct *files) {} |
1324 | static inline bool locks_owner_has_blockers(struct file_lock_context *flctx, |
1325 | fl_owner_t owner) |
1326 | { |
1327 | return false; |
1328 | } |
1329 | #endif /* !CONFIG_FILE_LOCKING */ |
1330 | |
1331 | static inline struct inode *file_inode(const struct file *f) |
1332 | { |
1333 | return f->f_inode; |
1334 | } |
1335 | |
1336 | static inline struct dentry *file_dentry(const struct file *file) |
1337 | { |
1338 | return d_real(file->f_path.dentry, file_inode(file)); |
1339 | } |
1340 | |
1341 | static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl) |
1342 | { |
1343 | return locks_lock_inode_wait(locks_inode(filp), fl); |
1344 | } |
1345 | |
1346 | struct fasync_struct { |
1347 | rwlock_t fa_lock; |
1348 | int magic; |
1349 | int fa_fd; |
1350 | struct fasync_struct *fa_next; /* singly linked list */ |
1351 | struct file *fa_file; |
1352 | struct rcu_head fa_rcu; |
1353 | }; |
1354 | |
1355 | #define FASYNC_MAGIC 0x4601 |
1356 | |
1357 | /* SMP safe fasync helpers: */ |
1358 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
1359 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
1360 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
1361 | extern struct fasync_struct *fasync_alloc(void); |
1362 | extern void fasync_free(struct fasync_struct *); |
1363 | |
1364 | /* can be called from interrupts */ |
1365 | extern void kill_fasync(struct fasync_struct **, int, int); |
1366 | |
1367 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
1368 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
1369 | extern void f_delown(struct file *filp); |
1370 | extern pid_t f_getown(struct file *filp); |
1371 | extern int send_sigurg(struct fown_struct *fown); |
1372 | |
1373 | /* |
1374 | * sb->s_flags. Note that these mirror the equivalent MS_* flags where |
1375 | * represented in both. |
1376 | */ |
1377 | #define SB_RDONLY 1 /* Mount read-only */ |
1378 | #define SB_NOSUID 2 /* Ignore suid and sgid bits */ |
1379 | #define SB_NODEV 4 /* Disallow access to device special files */ |
1380 | #define SB_NOEXEC 8 /* Disallow program execution */ |
1381 | #define SB_SYNCHRONOUS 16 /* Writes are synced at once */ |
1382 | #define SB_MANDLOCK 64 /* Allow mandatory locks on an FS */ |
1383 | #define SB_DIRSYNC 128 /* Directory modifications are synchronous */ |
1384 | #define SB_NOATIME 1024 /* Do not update access times. */ |
1385 | #define SB_NODIRATIME 2048 /* Do not update directory access times */ |
1386 | #define SB_SILENT 32768 |
1387 | #define SB_POSIXACL (1<<16) /* VFS does not apply the umask */ |
1388 | #define SB_INLINECRYPT (1<<17) /* Use blk-crypto for encrypted files */ |
1389 | #define SB_KERNMOUNT (1<<22) /* this is a kern_mount call */ |
1390 | #define SB_I_VERSION (1<<23) /* Update inode I_version field */ |
1391 | #define SB_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ |
1392 | |
1393 | /* These sb flags are internal to the kernel */ |
1394 | #define SB_SUBMOUNT (1<<26) |
1395 | #define SB_FORCE (1<<27) |
1396 | #define SB_NOSEC (1<<28) |
1397 | #define SB_BORN (1<<29) |
1398 | #define SB_ACTIVE (1<<30) |
1399 | #define SB_NOUSER (1<<31) |
1400 | |
1401 | /* These flags relate to encoding and casefolding */ |
1402 | #define SB_ENC_STRICT_MODE_FL (1 << 0) |
1403 | |
1404 | #define sb_has_strict_encoding(sb) \ |
1405 | (sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL) |
1406 | |
1407 | /* |
1408 | * Umount options |
1409 | */ |
1410 | |
1411 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
1412 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
1413 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
1414 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
1415 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
1416 | |
1417 | /* sb->s_iflags */ |
1418 | #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */ |
1419 | #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */ |
1420 | #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */ |
1421 | #define SB_I_STABLE_WRITES 0x00000008 /* don't modify blks until WB is done */ |
1422 | |
1423 | /* sb->s_iflags to limit user namespace mounts */ |
1424 | #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */ |
1425 | #define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020 |
1426 | #define SB_I_UNTRUSTED_MOUNTER 0x00000040 |
1427 | |
1428 | #define SB_I_SKIP_SYNC 0x00000100 /* Skip superblock at global sync */ |
1429 | #define SB_I_PERSB_BDI 0x00000200 /* has a per-sb bdi */ |
1430 | #define SB_I_TS_EXPIRY_WARNED 0x00000400 /* warned about timestamp range expiry */ |
1431 | #define SB_I_RETIRED 0x00000800 /* superblock shouldn't be reused */ |
1432 | |
1433 | /* Possible states of 'frozen' field */ |
1434 | enum { |
1435 | SB_UNFROZEN = 0, /* FS is unfrozen */ |
1436 | SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ |
1437 | SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ |
1438 | SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop |
1439 | * internal threads if needed) */ |
1440 | SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ |
1441 | }; |
1442 | |
1443 | #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) |
1444 | |
1445 | struct sb_writers { |
1446 | int frozen; /* Is sb frozen? */ |
1447 | wait_queue_head_t wait_unfrozen; /* wait for thaw */ |
1448 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; |
1449 | }; |
1450 | |
1451 | struct super_block { |
1452 | struct list_head s_list; /* Keep this first */ |
1453 | dev_t s_dev; /* search index; _not_ kdev_t */ |
1454 | unsigned char s_blocksize_bits; |
1455 | unsigned long s_blocksize; |
1456 | loff_t s_maxbytes; /* Max file size */ |
1457 | struct file_system_type *s_type; |
1458 | const struct super_operations *s_op; |
1459 | const struct dquot_operations *dq_op; |
1460 | const struct quotactl_ops *s_qcop; |
1461 | const struct export_operations *s_export_op; |
1462 | unsigned long s_flags; |
1463 | unsigned long s_iflags; /* internal SB_I_* flags */ |
1464 | unsigned long s_magic; |
1465 | struct dentry *s_root; |
1466 | struct rw_semaphore s_umount; |
1467 | int s_count; |
1468 | atomic_t s_active; |
1469 | #ifdef CONFIG_SECURITY |
1470 | void *s_security; |
1471 | #endif |
1472 | const struct xattr_handler **s_xattr; |
1473 | #ifdef CONFIG_FS_ENCRYPTION |
1474 | const struct fscrypt_operations *s_cop; |
1475 | struct key *s_master_keys; /* master crypto keys in use */ |
1476 | #endif |
1477 | #ifdef CONFIG_FS_VERITY |
1478 | const struct fsverity_operations *s_vop; |
1479 | #endif |
1480 | #if IS_ENABLED(CONFIG_UNICODE) |
1481 | struct unicode_map *s_encoding; |
1482 | __u16 s_encoding_flags; |
1483 | #endif |
1484 | struct hlist_bl_head s_roots; /* alternate root dentries for NFS */ |
1485 | struct list_head s_mounts; /* list of mounts; _not_ for fs use */ |
1486 | struct block_device *s_bdev; |
1487 | struct backing_dev_info *s_bdi; |
1488 | struct mtd_info *s_mtd; |
1489 | struct hlist_node s_instances; |
1490 | unsigned int s_quota_types; /* Bitmask of supported quota types */ |
1491 | struct quota_info s_dquot; /* Diskquota specific options */ |
1492 | |
1493 | struct sb_writers s_writers; |
1494 | |
1495 | /* |
1496 | * Keep s_fs_info, s_time_gran, s_fsnotify_mask, and |
1497 | * s_fsnotify_marks together for cache efficiency. They are frequently |
1498 | * accessed and rarely modified. |
1499 | */ |
1500 | void *s_fs_info; /* Filesystem private info */ |
1501 | |
1502 | /* Granularity of c/m/atime in ns (cannot be worse than a second) */ |
1503 | u32 s_time_gran; |
1504 | /* Time limits for c/m/atime in seconds */ |
1505 | time64_t s_time_min; |
1506 | time64_t s_time_max; |
1507 | #ifdef CONFIG_FSNOTIFY |
1508 | __u32 s_fsnotify_mask; |
1509 | struct fsnotify_mark_connector __rcu *s_fsnotify_marks; |
1510 | #endif |
1511 | |
1512 | char s_id[32]; /* Informational name */ |
1513 | uuid_t s_uuid; /* UUID */ |
1514 | |
1515 | unsigned int s_max_links; |
1516 | fmode_t s_mode; |
1517 | |
1518 | /* |
1519 | * The next field is for VFS *only*. No filesystems have any business |
1520 | * even looking at it. You had been warned. |
1521 | */ |
1522 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
1523 | |
1524 | /* |
1525 | * Filesystem subtype. If non-empty the filesystem type field |
1526 | * in /proc/mounts will be "type.subtype" |
1527 | */ |
1528 | const char *s_subtype; |
1529 | |
1530 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
1531 | |
1532 | struct shrinker s_shrink; /* per-sb shrinker handle */ |
1533 | |
1534 | /* Number of inodes with nlink == 0 but still referenced */ |
1535 | atomic_long_t s_remove_count; |
1536 | |
1537 | /* |
1538 | * Number of inode/mount/sb objects that are being watched, note that |
1539 | * inodes objects are currently double-accounted. |
1540 | */ |
1541 | atomic_long_t s_fsnotify_connectors; |
1542 | |
1543 | /* Being remounted read-only */ |
1544 | int s_readonly_remount; |
1545 | |
1546 | /* per-sb errseq_t for reporting writeback errors via syncfs */ |
1547 | errseq_t s_wb_err; |
1548 | |
1549 | /* AIO completions deferred from interrupt context */ |
1550 | struct workqueue_struct *s_dio_done_wq; |
1551 | struct hlist_head s_pins; |
1552 | |
1553 | /* |
1554 | * Owning user namespace and default context in which to |
1555 | * interpret filesystem uids, gids, quotas, device nodes, |
1556 | * xattrs and security labels. |
1557 | */ |
1558 | struct user_namespace *s_user_ns; |
1559 | |
1560 | /* |
1561 | * The list_lru structure is essentially just a pointer to a table |
1562 | * of per-node lru lists, each of which has its own spinlock. |
1563 | * There is no need to put them into separate cachelines. |
1564 | */ |
1565 | struct list_lru s_dentry_lru; |
1566 | struct list_lru s_inode_lru; |
1567 | struct rcu_head rcu; |
1568 | struct work_struct destroy_work; |
1569 | |
1570 | struct mutex s_sync_lock; /* sync serialisation lock */ |
1571 | |
1572 | /* |
1573 | * Indicates how deep in a filesystem stack this SB is |
1574 | */ |
1575 | int s_stack_depth; |
1576 | |
1577 | /* s_inode_list_lock protects s_inodes */ |
1578 | spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp; |
1579 | struct list_head s_inodes; /* all inodes */ |
1580 | |
1581 | spinlock_t s_inode_wblist_lock; |
1582 | struct list_head s_inodes_wb; /* writeback inodes */ |
1583 | } __randomize_layout; |
1584 | |
1585 | static inline struct user_namespace *i_user_ns(const struct inode *inode) |
1586 | { |
1587 | return inode->i_sb->s_user_ns; |
1588 | } |
1589 | |
1590 | /* Helper functions so that in most cases filesystems will |
1591 | * not need to deal directly with kuid_t and kgid_t and can |
1592 | * instead deal with the raw numeric values that are stored |
1593 | * in the filesystem. |
1594 | */ |
1595 | static inline uid_t i_uid_read(const struct inode *inode) |
1596 | { |
1597 | return from_kuid(i_user_ns(inode), inode->i_uid); |
1598 | } |
1599 | |
1600 | static inline gid_t i_gid_read(const struct inode *inode) |
1601 | { |
1602 | return from_kgid(i_user_ns(inode), inode->i_gid); |
1603 | } |
1604 | |
1605 | static inline void i_uid_write(struct inode *inode, uid_t uid) |
1606 | { |
1607 | inode->i_uid = make_kuid(i_user_ns(inode), uid); |
1608 | } |
1609 | |
1610 | static inline void i_gid_write(struct inode *inode, gid_t gid) |
1611 | { |
1612 | inode->i_gid = make_kgid(i_user_ns(inode), gid); |
1613 | } |
1614 | |
1615 | /** |
1616 | * i_uid_into_mnt - map an inode's i_uid down into a mnt_userns |
1617 | * @mnt_userns: user namespace of the mount the inode was found from |
1618 | * @inode: inode to map |
1619 | * |
1620 | * Note, this will eventually be removed completely in favor of the type-safe |
1621 | * i_uid_into_vfsuid(). |
1622 | * |
1623 | * Return: the inode's i_uid mapped down according to @mnt_userns. |
1624 | * If the inode's i_uid has no mapping INVALID_UID is returned. |
1625 | */ |
1626 | static inline kuid_t i_uid_into_mnt(struct user_namespace *mnt_userns, |
1627 | const struct inode *inode) |
1628 | { |
1629 | return AS_KUIDT(make_vfsuid(mnt_userns, i_user_ns(inode), inode->i_uid)); |
1630 | } |
1631 | |
1632 | /** |
1633 | * i_uid_into_vfsuid - map an inode's i_uid down into a mnt_userns |
1634 | * @mnt_userns: user namespace of the mount the inode was found from |
1635 | * @inode: inode to map |
1636 | * |
1637 | * Return: whe inode's i_uid mapped down according to @mnt_userns. |
1638 | * If the inode's i_uid has no mapping INVALID_VFSUID is returned. |
1639 | */ |
1640 | static inline vfsuid_t i_uid_into_vfsuid(struct user_namespace *mnt_userns, |
1641 | const struct inode *inode) |
1642 | { |
1643 | return make_vfsuid(mnt_userns, i_user_ns(inode), inode->i_uid); |
1644 | } |
1645 | |
1646 | /** |
1647 | * i_uid_needs_update - check whether inode's i_uid needs to be updated |
1648 | * @mnt_userns: user namespace of the mount the inode was found from |
1649 | * @attr: the new attributes of @inode |
1650 | * @inode: the inode to update |
1651 | * |
1652 | * Check whether the $inode's i_uid field needs to be updated taking idmapped |
1653 | * mounts into account if the filesystem supports it. |
1654 | * |
1655 | * Return: true if @inode's i_uid field needs to be updated, false if not. |
1656 | */ |
1657 | static inline bool i_uid_needs_update(struct user_namespace *mnt_userns, |
1658 | const struct iattr *attr, |
1659 | const struct inode *inode) |
1660 | { |
1661 | return ((attr->ia_valid & ATTR_UID) && |
1662 | !vfsuid_eq(attr->ia_vfsuid, |
1663 | i_uid_into_vfsuid(mnt_userns, inode))); |
1664 | } |
1665 | |
1666 | /** |
1667 | * i_uid_update - update @inode's i_uid field |
1668 | * @mnt_userns: user namespace of the mount the inode was found from |
1669 | * @attr: the new attributes of @inode |
1670 | * @inode: the inode to update |
1671 | * |
1672 | * Safely update @inode's i_uid field translating the vfsuid of any idmapped |
1673 | * mount into the filesystem kuid. |
1674 | */ |
1675 | static inline void i_uid_update(struct user_namespace *mnt_userns, |
1676 | const struct iattr *attr, |
1677 | struct inode *inode) |
1678 | { |
1679 | if (attr->ia_valid & ATTR_UID) |
1680 | inode->i_uid = from_vfsuid(mnt_userns, i_user_ns(inode), |
1681 | attr->ia_vfsuid); |
1682 | } |
1683 | |
1684 | /** |
1685 | * i_gid_into_mnt - map an inode's i_gid down into a mnt_userns |
1686 | * @mnt_userns: user namespace of the mount the inode was found from |
1687 | * @inode: inode to map |
1688 | * |
1689 | * Note, this will eventually be removed completely in favor of the type-safe |
1690 | * i_gid_into_vfsgid(). |
1691 | * |
1692 | * Return: the inode's i_gid mapped down according to @mnt_userns. |
1693 | * If the inode's i_gid has no mapping INVALID_GID is returned. |
1694 | */ |
1695 | static inline kgid_t i_gid_into_mnt(struct user_namespace *mnt_userns, |
1696 | const struct inode *inode) |
1697 | { |
1698 | return AS_KGIDT(make_vfsgid(mnt_userns, i_user_ns(inode), inode->i_gid)); |
1699 | } |
1700 | |
1701 | /** |
1702 | * i_gid_into_vfsgid - map an inode's i_gid down into a mnt_userns |
1703 | * @mnt_userns: user namespace of the mount the inode was found from |
1704 | * @inode: inode to map |
1705 | * |
1706 | * Return: the inode's i_gid mapped down according to @mnt_userns. |
1707 | * If the inode's i_gid has no mapping INVALID_VFSGID is returned. |
1708 | */ |
1709 | static inline vfsgid_t i_gid_into_vfsgid(struct user_namespace *mnt_userns, |
1710 | const struct inode *inode) |
1711 | { |
1712 | return make_vfsgid(mnt_userns, i_user_ns(inode), inode->i_gid); |
1713 | } |
1714 | |
1715 | /** |
1716 | * i_gid_needs_update - check whether inode's i_gid needs to be updated |
1717 | * @mnt_userns: user namespace of the mount the inode was found from |
1718 | * @attr: the new attributes of @inode |
1719 | * @inode: the inode to update |
1720 | * |
1721 | * Check whether the $inode's i_gid field needs to be updated taking idmapped |
1722 | * mounts into account if the filesystem supports it. |
1723 | * |
1724 | * Return: true if @inode's i_gid field needs to be updated, false if not. |
1725 | */ |
1726 | static inline bool i_gid_needs_update(struct user_namespace *mnt_userns, |
1727 | const struct iattr *attr, |
1728 | const struct inode *inode) |
1729 | { |
1730 | return ((attr->ia_valid & ATTR_GID) && |
1731 | !vfsgid_eq(attr->ia_vfsgid, |
1732 | i_gid_into_vfsgid(mnt_userns, inode))); |
1733 | } |
1734 | |
1735 | /** |
1736 | * i_gid_update - update @inode's i_gid field |
1737 | * @mnt_userns: user namespace of the mount the inode was found from |
1738 | * @attr: the new attributes of @inode |
1739 | * @inode: the inode to update |
1740 | * |
1741 | * Safely update @inode's i_gid field translating the vfsgid of any idmapped |
1742 | * mount into the filesystem kgid. |
1743 | */ |
1744 | static inline void i_gid_update(struct user_namespace *mnt_userns, |
1745 | const struct iattr *attr, |
1746 | struct inode *inode) |
1747 | { |
1748 | if (attr->ia_valid & ATTR_GID) |
1749 | inode->i_gid = from_vfsgid(mnt_userns, i_user_ns(inode), |
1750 | attr->ia_vfsgid); |
1751 | } |
1752 | |
1753 | /** |
1754 | * inode_fsuid_set - initialize inode's i_uid field with callers fsuid |
1755 | * @inode: inode to initialize |
1756 | * @mnt_userns: user namespace of the mount the inode was found from |
1757 | * |
1758 | * Initialize the i_uid field of @inode. If the inode was found/created via |
1759 | * an idmapped mount map the caller's fsuid according to @mnt_users. |
1760 | */ |
1761 | static inline void inode_fsuid_set(struct inode *inode, |
1762 | struct user_namespace *mnt_userns) |
1763 | { |
1764 | inode->i_uid = mapped_fsuid(mnt_userns, i_user_ns(inode)); |
1765 | } |
1766 | |
1767 | /** |
1768 | * inode_fsgid_set - initialize inode's i_gid field with callers fsgid |
1769 | * @inode: inode to initialize |
1770 | * @mnt_userns: user namespace of the mount the inode was found from |
1771 | * |
1772 | * Initialize the i_gid field of @inode. If the inode was found/created via |
1773 | * an idmapped mount map the caller's fsgid according to @mnt_users. |
1774 | */ |
1775 | static inline void inode_fsgid_set(struct inode *inode, |
1776 | struct user_namespace *mnt_userns) |
1777 | { |
1778 | inode->i_gid = mapped_fsgid(mnt_userns, i_user_ns(inode)); |
1779 | } |
1780 | |
1781 | /** |
1782 | * fsuidgid_has_mapping() - check whether caller's fsuid/fsgid is mapped |
1783 | * @sb: the superblock we want a mapping in |
1784 | * @mnt_userns: user namespace of the relevant mount |
1785 | * |
1786 | * Check whether the caller's fsuid and fsgid have a valid mapping in the |
1787 | * s_user_ns of the superblock @sb. If the caller is on an idmapped mount map |
1788 | * the caller's fsuid and fsgid according to the @mnt_userns first. |
1789 | * |
1790 | * Return: true if fsuid and fsgid is mapped, false if not. |
1791 | */ |
1792 | static inline bool fsuidgid_has_mapping(struct super_block *sb, |
1793 | struct user_namespace *mnt_userns) |
1794 | { |
1795 | struct user_namespace *fs_userns = sb->s_user_ns; |
1796 | kuid_t kuid; |
1797 | kgid_t kgid; |
1798 | |
1799 | kuid = mapped_fsuid(mnt_userns, fs_userns); |
1800 | if (!uid_valid(kuid)) |
1801 | return false; |
1802 | kgid = mapped_fsgid(mnt_userns, fs_userns); |
1803 | if (!gid_valid(kgid)) |
1804 | return false; |
1805 | return kuid_has_mapping(fs_userns, kuid) && |
1806 | kgid_has_mapping(fs_userns, kgid); |
1807 | } |
1808 | |
1809 | extern struct timespec64 current_time(struct inode *inode); |
1810 | |
1811 | /* |
1812 | * Snapshotting support. |
1813 | */ |
1814 | |
1815 | /* |
1816 | * These are internal functions, please use sb_start_{write,pagefault,intwrite} |
1817 | * instead. |
1818 | */ |
1819 | static inline void __sb_end_write(struct super_block *sb, int level) |
1820 | { |
1821 | percpu_up_read(sb->s_writers.rw_sem + level-1); |
1822 | } |
1823 | |
1824 | static inline void __sb_start_write(struct super_block *sb, int level) |
1825 | { |
1826 | percpu_down_read(sb->s_writers.rw_sem + level - 1); |
1827 | } |
1828 | |
1829 | static inline bool __sb_start_write_trylock(struct super_block *sb, int level) |
1830 | { |
1831 | return percpu_down_read_trylock(sb->s_writers.rw_sem + level - 1); |
1832 | } |
1833 | |
1834 | #define __sb_writers_acquired(sb, lev) \ |
1835 | percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
1836 | #define __sb_writers_release(sb, lev) \ |
1837 | percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) |
1838 | |
1839 | static inline bool sb_write_started(const struct super_block *sb) |
1840 | { |
1841 | return lockdep_is_held_type(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1, 1); |
1842 | } |
1843 | |
1844 | /** |
1845 | * sb_end_write - drop write access to a superblock |
1846 | * @sb: the super we wrote to |
1847 | * |
1848 | * Decrement number of writers to the filesystem. Wake up possible waiters |
1849 | * wanting to freeze the filesystem. |
1850 | */ |
1851 | static inline void sb_end_write(struct super_block *sb) |
1852 | { |
1853 | __sb_end_write(sb, SB_FREEZE_WRITE); |
1854 | } |
1855 | |
1856 | /** |
1857 | * sb_end_pagefault - drop write access to a superblock from a page fault |
1858 | * @sb: the super we wrote to |
1859 | * |
1860 | * Decrement number of processes handling write page fault to the filesystem. |
1861 | * Wake up possible waiters wanting to freeze the filesystem. |
1862 | */ |
1863 | static inline void sb_end_pagefault(struct super_block *sb) |
1864 | { |
1865 | __sb_end_write(sb, SB_FREEZE_PAGEFAULT); |
1866 | } |
1867 | |
1868 | /** |
1869 | * sb_end_intwrite - drop write access to a superblock for internal fs purposes |
1870 | * @sb: the super we wrote to |
1871 | * |
1872 | * Decrement fs-internal number of writers to the filesystem. Wake up possible |
1873 | * waiters wanting to freeze the filesystem. |
1874 | */ |
1875 | static inline void sb_end_intwrite(struct super_block *sb) |
1876 | { |
1877 | __sb_end_write(sb, SB_FREEZE_FS); |
1878 | } |
1879 | |
1880 | /** |
1881 | * sb_start_write - get write access to a superblock |
1882 | * @sb: the super we write to |
1883 | * |
1884 | * When a process wants to write data or metadata to a file system (i.e. dirty |
1885 | * a page or an inode), it should embed the operation in a sb_start_write() - |
1886 | * sb_end_write() pair to get exclusion against file system freezing. This |
1887 | * function increments number of writers preventing freezing. If the file |
1888 | * system is already frozen, the function waits until the file system is |
1889 | * thawed. |
1890 | * |
1891 | * Since freeze protection behaves as a lock, users have to preserve |
1892 | * ordering of freeze protection and other filesystem locks. Generally, |
1893 | * freeze protection should be the outermost lock. In particular, we have: |
1894 | * |
1895 | * sb_start_write |
1896 | * -> i_mutex (write path, truncate, directory ops, ...) |
1897 | * -> s_umount (freeze_super, thaw_super) |
1898 | */ |
1899 | static inline void sb_start_write(struct super_block *sb) |
1900 | { |
1901 | __sb_start_write(sb, SB_FREEZE_WRITE); |
1902 | } |
1903 | |
1904 | static inline bool sb_start_write_trylock(struct super_block *sb) |
1905 | { |
1906 | return __sb_start_write_trylock(sb, SB_FREEZE_WRITE); |
1907 | } |
1908 | |
1909 | /** |
1910 | * sb_start_pagefault - get write access to a superblock from a page fault |
1911 | * @sb: the super we write to |
1912 | * |
1913 | * When a process starts handling write page fault, it should embed the |
1914 | * operation into sb_start_pagefault() - sb_end_pagefault() pair to get |
1915 | * exclusion against file system freezing. This is needed since the page fault |
1916 | * is going to dirty a page. This function increments number of running page |
1917 | * faults preventing freezing. If the file system is already frozen, the |
1918 | * function waits until the file system is thawed. |
1919 | * |
1920 | * Since page fault freeze protection behaves as a lock, users have to preserve |
1921 | * ordering of freeze protection and other filesystem locks. It is advised to |
1922 | * put sb_start_pagefault() close to mmap_lock in lock ordering. Page fault |
1923 | * handling code implies lock dependency: |
1924 | * |
1925 | * mmap_lock |
1926 | * -> sb_start_pagefault |
1927 | */ |
1928 | static inline void sb_start_pagefault(struct super_block *sb) |
1929 | { |
1930 | __sb_start_write(sb, SB_FREEZE_PAGEFAULT); |
1931 | } |
1932 | |
1933 | /** |
1934 | * sb_start_intwrite - get write access to a superblock for internal fs purposes |
1935 | * @sb: the super we write to |
1936 | * |
1937 | * This is the third level of protection against filesystem freezing. It is |
1938 | * free for use by a filesystem. The only requirement is that it must rank |
1939 | * below sb_start_pagefault. |
1940 | * |
1941 | * For example filesystem can call sb_start_intwrite() when starting a |
1942 | * transaction which somewhat eases handling of freezing for internal sources |
1943 | * of filesystem changes (internal fs threads, discarding preallocation on file |
1944 | * close, etc.). |
1945 | */ |
1946 | static inline void sb_start_intwrite(struct super_block *sb) |
1947 | { |
1948 | __sb_start_write(sb, SB_FREEZE_FS); |
1949 | } |
1950 | |
1951 | static inline bool sb_start_intwrite_trylock(struct super_block *sb) |
1952 | { |
1953 | return __sb_start_write_trylock(sb, SB_FREEZE_FS); |
1954 | } |
1955 | |
1956 | bool inode_owner_or_capable(struct user_namespace *mnt_userns, |
1957 | const struct inode *inode); |
1958 | |
1959 | /* |
1960 | * VFS helper functions.. |
1961 | */ |
1962 | int vfs_create(struct user_namespace *, struct inode *, |
1963 | struct dentry *, umode_t, bool); |
1964 | int vfs_mkdir(struct user_namespace *, struct inode *, |
1965 | struct dentry *, umode_t); |
1966 | int vfs_mknod(struct user_namespace *, struct inode *, struct dentry *, |
1967 | umode_t, dev_t); |
1968 | int vfs_symlink(struct user_namespace *, struct inode *, |
1969 | struct dentry *, const char *); |
1970 | int vfs_link(struct dentry *, struct user_namespace *, struct inode *, |
1971 | struct dentry *, struct inode **); |
1972 | int vfs_rmdir(struct user_namespace *, struct inode *, struct dentry *); |
1973 | int vfs_unlink(struct user_namespace *, struct inode *, struct dentry *, |
1974 | struct inode **); |
1975 | |
1976 | /** |
1977 | * struct renamedata - contains all information required for renaming |
1978 | * @old_mnt_userns: old user namespace of the mount the inode was found from |
1979 | * @old_dir: parent of source |
1980 | * @old_dentry: source |
1981 | * @new_mnt_userns: new user namespace of the mount the inode was found from |
1982 | * @new_dir: parent of destination |
1983 | * @new_dentry: destination |
1984 | * @delegated_inode: returns an inode needing a delegation break |
1985 | * @flags: rename flags |
1986 | */ |
1987 | struct renamedata { |
1988 | struct user_namespace *old_mnt_userns; |
1989 | struct inode *old_dir; |
1990 | struct dentry *old_dentry; |
1991 | struct user_namespace *new_mnt_userns; |
1992 | struct inode *new_dir; |
1993 | struct dentry *new_dentry; |
1994 | struct inode **delegated_inode; |
1995 | unsigned int flags; |
1996 | } __randomize_layout; |
1997 | |
1998 | int vfs_rename(struct renamedata *); |
1999 | |
2000 | static inline int vfs_whiteout(struct user_namespace *mnt_userns, |
2001 | struct inode *dir, struct dentry *dentry) |
2002 | { |
2003 | return vfs_mknod(mnt_userns, dir, dentry, S_IFCHR | WHITEOUT_MODE, |
2004 | WHITEOUT_DEV); |
2005 | } |
2006 | |
2007 | struct dentry *vfs_tmpfile(struct user_namespace *mnt_userns, |
2008 | struct dentry *dentry, umode_t mode, int open_flag); |
2009 | |
2010 | int vfs_mkobj(struct dentry *, umode_t, |
2011 | int (*f)(struct dentry *, umode_t, void *), |
2012 | void *); |
2013 | |
2014 | int vfs_fchown(struct file *file, uid_t user, gid_t group); |
2015 | int vfs_fchmod(struct file *file, umode_t mode); |
2016 | int vfs_utimes(const struct path *path, struct timespec64 *times); |
2017 | |
2018 | extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
2019 | |
2020 | #ifdef CONFIG_COMPAT |
2021 | extern long compat_ptr_ioctl(struct file *file, unsigned int cmd, |
2022 | unsigned long arg); |
2023 | #else |
2024 | #define compat_ptr_ioctl NULL |
2025 | #endif |
2026 | |
2027 | /* |
2028 | * VFS file helper functions. |
2029 | */ |
2030 | void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode, |
2031 | const struct inode *dir, umode_t mode); |
2032 | extern bool may_open_dev(const struct path *path); |
2033 | umode_t mode_strip_sgid(struct user_namespace *mnt_userns, |
2034 | const struct inode *dir, umode_t mode); |
2035 | |
2036 | /* |
2037 | * This is the "filldir" function type, used by readdir() to let |
2038 | * the kernel specify what kind of dirent layout it wants to have. |
2039 | * This allows the kernel to read directories into kernel space or |
2040 | * to have different dirent layouts depending on the binary type. |
2041 | */ |
2042 | struct dir_context; |
2043 | typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, |
2044 | unsigned); |
2045 | |
2046 | struct dir_context { |
2047 | filldir_t actor; |
2048 | loff_t pos; |
2049 | }; |
2050 | |
2051 | /* |
2052 | * These flags let !MMU mmap() govern direct device mapping vs immediate |
2053 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. |
2054 | * |
2055 | * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) |
2056 | * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) |
2057 | * NOMMU_MAP_READ: Can be mapped for reading |
2058 | * NOMMU_MAP_WRITE: Can be mapped for writing |
2059 | * NOMMU_MAP_EXEC: Can be mapped for execution |
2060 | */ |
2061 | #define NOMMU_MAP_COPY 0x00000001 |
2062 | #define NOMMU_MAP_DIRECT 0x00000008 |
2063 | #define NOMMU_MAP_READ VM_MAYREAD |
2064 | #define NOMMU_MAP_WRITE VM_MAYWRITE |
2065 | #define NOMMU_MAP_EXEC VM_MAYEXEC |
2066 | |
2067 | #define NOMMU_VMFLAGS \ |
2068 | (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) |
2069 | |
2070 | /* |
2071 | * These flags control the behavior of the remap_file_range function pointer. |
2072 | * If it is called with len == 0 that means "remap to end of source file". |
2073 | * See Documentation/filesystems/vfs.rst for more details about this call. |
2074 | * |
2075 | * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate) |
2076 | * REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request |
2077 | */ |
2078 | #define REMAP_FILE_DEDUP (1 << 0) |
2079 | #define REMAP_FILE_CAN_SHORTEN (1 << 1) |
2080 | |
2081 | /* |
2082 | * These flags signal that the caller is ok with altering various aspects of |
2083 | * the behavior of the remap operation. The changes must be made by the |
2084 | * implementation; the vfs remap helper functions can take advantage of them. |
2085 | * Flags in this category exist to preserve the quirky behavior of the hoisted |
2086 | * btrfs clone/dedupe ioctls. |
2087 | */ |
2088 | #define REMAP_FILE_ADVISORY (REMAP_FILE_CAN_SHORTEN) |
2089 | |
2090 | struct iov_iter; |
2091 | struct io_uring_cmd; |
2092 | |
2093 | struct file_operations { |
2094 | struct module *owner; |
2095 | loff_t (*llseek) (struct file *, loff_t, int); |
2096 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
2097 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
2098 | ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); |
2099 | ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); |
2100 | int (*iopoll)(struct kiocb *kiocb, struct io_comp_batch *, |
2101 | unsigned int flags); |
2102 | int (*iterate) (struct file *, struct dir_context *); |
2103 | int (*iterate_shared) (struct file *, struct dir_context *); |
2104 | __poll_t (*poll) (struct file *, struct poll_table_struct *); |
2105 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
2106 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
2107 | int (*mmap) (struct file *, struct vm_area_struct *); |
2108 | unsigned long mmap_supported_flags; |
2109 | int (*open) (struct inode *, struct file *); |
2110 | int (*flush) (struct file *, fl_owner_t id); |
2111 | int (*release) (struct inode *, struct file *); |
2112 | int (*fsync) (struct file *, loff_t, loff_t, int datasync); |
2113 | int (*fasync) (int, struct file *, int); |
2114 | int (*lock) (struct file *, int, struct file_lock *); |
2115 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
2116 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
2117 | int (*check_flags)(int); |
2118 | int (*flock) (struct file *, int, struct file_lock *); |
2119 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
2120 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
2121 | int (*setlease)(struct file *, long, struct file_lock **, void **); |
2122 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
2123 | loff_t len); |
2124 | void (*show_fdinfo)(struct seq_file *m, struct file *f); |
2125 | #ifndef CONFIG_MMU |
2126 | unsigned (*mmap_capabilities)(struct file *); |
2127 | #endif |
2128 | ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, |
2129 | loff_t, size_t, unsigned int); |
2130 | loff_t (*remap_file_range)(struct file *file_in, loff_t pos_in, |
2131 | struct file *file_out, loff_t pos_out, |
2132 | loff_t len, unsigned int remap_flags); |
2133 | int (*fadvise)(struct file *, loff_t, loff_t, int); |
2134 | int (*uring_cmd)(struct io_uring_cmd *ioucmd, unsigned int issue_flags); |
2135 | } __randomize_layout; |
2136 | |
2137 | struct inode_operations { |
2138 | struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); |
2139 | const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); |
2140 | int (*permission) (struct user_namespace *, struct inode *, int); |
2141 | struct posix_acl * (*get_acl)(struct inode *, int, bool); |
2142 | |
2143 | int (*readlink) (struct dentry *, char __user *,int); |
2144 | |
2145 | int (*create) (struct user_namespace *, struct inode *,struct dentry *, |
2146 | umode_t, bool); |
2147 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
2148 | int (*unlink) (struct inode *,struct dentry *); |
2149 | int (*symlink) (struct user_namespace *, struct inode *,struct dentry *, |
2150 | const char *); |
2151 | int (*mkdir) (struct user_namespace *, struct inode *,struct dentry *, |
2152 | umode_t); |
2153 | int (*rmdir) (struct inode *,struct dentry *); |
2154 | int (*mknod) (struct user_namespace *, struct inode *,struct dentry *, |
2155 | umode_t,dev_t); |
2156 | int (*rename) (struct user_namespace *, struct inode *, struct dentry *, |
2157 | struct inode *, struct dentry *, unsigned int); |
2158 | int (*setattr) (struct user_namespace *, struct dentry *, |
2159 | struct iattr *); |
2160 | int (*getattr) (struct user_namespace *, const struct path *, |
2161 | struct kstat *, u32, unsigned int); |
2162 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
2163 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
2164 | u64 len); |
2165 | int (*update_time)(struct inode *, struct timespec64 *, int); |
2166 | int (*atomic_open)(struct inode *, struct dentry *, |
2167 | struct file *, unsigned open_flag, |
2168 | umode_t create_mode); |
2169 | int (*tmpfile) (struct user_namespace *, struct inode *, |
2170 | struct dentry *, umode_t); |
2171 | int (*set_acl)(struct user_namespace *, struct inode *, |
2172 | struct posix_acl *, int); |
2173 | int (*fileattr_set)(struct user_namespace *mnt_userns, |
2174 | struct dentry *dentry, struct fileattr *fa); |
2175 | int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa); |
2176 | } ____cacheline_aligned; |
2177 | |
2178 | static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio, |
2179 | struct iov_iter *iter) |
2180 | { |
2181 | return file->f_op->read_iter(kio, iter); |
2182 | } |
2183 | |
2184 | static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio, |
2185 | struct iov_iter *iter) |
2186 | { |
2187 | return file->f_op->write_iter(kio, iter); |
2188 | } |
2189 | |
2190 | static inline int call_mmap(struct file *file, struct vm_area_struct *vma) |
2191 | { |
2192 | return file->f_op->mmap(file, vma); |
2193 | } |
2194 | |
2195 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
2196 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
2197 | extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, |
2198 | loff_t, size_t, unsigned int); |
2199 | extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, |
2200 | struct file *file_out, loff_t pos_out, |
2201 | size_t len, unsigned int flags); |
2202 | int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, |
2203 | struct file *file_out, loff_t pos_out, |
2204 | loff_t *len, unsigned int remap_flags, |
2205 | const struct iomap_ops *dax_read_ops); |
2206 | int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, |
2207 | struct file *file_out, loff_t pos_out, |
2208 | loff_t *count, unsigned int remap_flags); |
2209 | extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, |
2210 | struct file *file_out, loff_t pos_out, |
2211 | loff_t len, unsigned int remap_flags); |
2212 | extern loff_t vfs_clone_file_range(struct file *file_in, loff_t pos_in, |
2213 | struct file *file_out, loff_t pos_out, |
2214 | loff_t len, unsigned int remap_flags); |
2215 | extern int vfs_dedupe_file_range(struct file *file, |
2216 | struct file_dedupe_range *same); |
2217 | extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, |
2218 | struct file *dst_file, loff_t dst_pos, |
2219 | loff_t len, unsigned int remap_flags); |
2220 | |
2221 | |
2222 | struct super_operations { |
2223 | struct inode *(*alloc_inode)(struct super_block *sb); |
2224 | void (*destroy_inode)(struct inode *); |
2225 | void (*free_inode)(struct inode *); |
2226 | |
2227 | void (*dirty_inode) (struct inode *, int flags); |
2228 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
2229 | int (*drop_inode) (struct inode *); |
2230 | void (*evict_inode) (struct inode *); |
2231 | void (*put_super) (struct super_block *); |
2232 | int (*sync_fs)(struct super_block *sb, int wait); |
2233 | int (*freeze_super) (struct super_block *); |
2234 | int (*freeze_fs) (struct super_block *); |
2235 | int (*thaw_super) (struct super_block *); |
2236 | int (*unfreeze_fs) (struct super_block *); |
2237 | int (*statfs) (struct dentry *, struct kstatfs *); |
2238 | int (*remount_fs) (struct super_block *, int *, char *); |
2239 | void (*umount_begin) (struct super_block *); |
2240 | |
2241 | int (*show_options)(struct seq_file *, struct dentry *); |
2242 | int (*show_devname)(struct seq_file *, struct dentry *); |
2243 | int (*show_path)(struct seq_file *, struct dentry *); |
2244 | int (*show_stats)(struct seq_file *, struct dentry *); |
2245 | #ifdef CONFIG_QUOTA |
2246 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
2247 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
2248 | struct dquot **(*get_dquots)(struct inode *); |
2249 | #endif |
2250 | long (*nr_cached_objects)(struct super_block *, |
2251 | struct shrink_control *); |
2252 | long (*free_cached_objects)(struct super_block *, |
2253 | struct shrink_control *); |
2254 | }; |
2255 | |
2256 | /* |
2257 | * Inode flags - they have no relation to superblock flags now |
2258 | */ |
2259 | #define S_SYNC (1 << 0) /* Writes are synced at once */ |
2260 | #define S_NOATIME (1 << 1) /* Do not update access times */ |
2261 | #define S_APPEND (1 << 2) /* Append-only file */ |
2262 | #define S_IMMUTABLE (1 << 3) /* Immutable file */ |
2263 | #define S_DEAD (1 << 4) /* removed, but still open directory */ |
2264 | #define S_NOQUOTA (1 << 5) /* Inode is not counted to quota */ |
2265 | #define S_DIRSYNC (1 << 6) /* Directory modifications are synchronous */ |
2266 | #define S_NOCMTIME (1 << 7) /* Do not update file c/mtime */ |
2267 | #define S_SWAPFILE (1 << 8) /* Do not truncate: swapon got its bmaps */ |
2268 | #define S_PRIVATE (1 << 9) /* Inode is fs-internal */ |
2269 | #define S_IMA (1 << 10) /* Inode has an associated IMA struct */ |
2270 | #define S_AUTOMOUNT (1 << 11) /* Automount/referral quasi-directory */ |
2271 | #define S_NOSEC (1 << 12) /* no suid or xattr security attributes */ |
2272 | #ifdef CONFIG_FS_DAX |
2273 | #define S_DAX (1 << 13) /* Direct Access, avoiding the page cache */ |
2274 | #else |
2275 | #define S_DAX 0 /* Make all the DAX code disappear */ |
2276 | #endif |
2277 | #define S_ENCRYPTED (1 << 14) /* Encrypted file (using fs/crypto/) */ |
2278 | #define S_CASEFOLD (1 << 15) /* Casefolded file */ |
2279 | #define S_VERITY (1 << 16) /* Verity file (using fs/verity/) */ |
2280 | #define S_KERNEL_FILE (1 << 17) /* File is in use by the kernel (eg. fs/cachefiles) */ |
2281 | |
2282 | /* |
2283 | * Note that nosuid etc flags are inode-specific: setting some file-system |
2284 | * flags just means all the inodes inherit those flags by default. It might be |
2285 | * possible to override it selectively if you really wanted to with some |
2286 | * ioctl() that is not currently implemented. |
2287 | * |
2288 | * Exception: SB_RDONLY is always applied to the entire file system. |
2289 | * |
2290 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
2291 | * with files in use. This means that all of the inodes will not have their |
2292 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
2293 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
2294 | */ |
2295 | #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) |
2296 | |
2297 | static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & SB_RDONLY; } |
2298 | #define IS_RDONLY(inode) sb_rdonly((inode)->i_sb) |
2299 | #define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \ |
2300 | ((inode)->i_flags & S_SYNC)) |
2301 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \ |
2302 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
2303 | #define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK) |
2304 | #define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME) |
2305 | #define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION) |
2306 | |
2307 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
2308 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
2309 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
2310 | #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL) |
2311 | |
2312 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
2313 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
2314 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
2315 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
2316 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
2317 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
2318 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
2319 | #define IS_DAX(inode) ((inode)->i_flags & S_DAX) |
2320 | #define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED) |
2321 | #define IS_CASEFOLDED(inode) ((inode)->i_flags & S_CASEFOLD) |
2322 | #define IS_VERITY(inode) ((inode)->i_flags & S_VERITY) |
2323 | |
2324 | #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ |
2325 | (inode)->i_rdev == WHITEOUT_DEV) |
2326 | |
2327 | static inline bool HAS_UNMAPPED_ID(struct user_namespace *mnt_userns, |
2328 | struct inode *inode) |
2329 | { |
2330 | return !vfsuid_valid(i_uid_into_vfsuid(mnt_userns, inode)) || |
2331 | !vfsgid_valid(i_gid_into_vfsgid(mnt_userns, inode)); |
2332 | } |
2333 | |
2334 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) |
2335 | { |
2336 | *kiocb = (struct kiocb) { |
2337 | .ki_filp = filp, |
2338 | .ki_flags = filp->f_iocb_flags, |
2339 | .ki_ioprio = get_current_ioprio(), |
2340 | }; |
2341 | } |
2342 | |
2343 | static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src, |
2344 | struct file *filp) |
2345 | { |
2346 | *kiocb = (struct kiocb) { |
2347 | .ki_filp = filp, |
2348 | .ki_flags = kiocb_src->ki_flags, |
2349 | .ki_ioprio = kiocb_src->ki_ioprio, |
2350 | .ki_pos = kiocb_src->ki_pos, |
2351 | }; |
2352 | } |
2353 | |
2354 | /* |
2355 | * Inode state bits. Protected by inode->i_lock |
2356 | * |
2357 | * Four bits determine the dirty state of the inode: I_DIRTY_SYNC, |
2358 | * I_DIRTY_DATASYNC, I_DIRTY_PAGES, and I_DIRTY_TIME. |
2359 | * |
2360 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
2361 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
2362 | * various stages of removing an inode. |
2363 | * |
2364 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
2365 | * |
2366 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
2367 | * fdatasync() (unless I_DIRTY_DATASYNC is also set). |
2368 | * Timestamp updates are the usual cause. |
2369 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
2370 | * these changes separately from I_DIRTY_SYNC so that we |
2371 | * don't have to write inode on fdatasync() when only |
2372 | * e.g. the timestamps have changed. |
2373 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
2374 | * I_DIRTY_TIME The inode itself only has dirty timestamps, and the |
2375 | * lazytime mount option is enabled. We keep track of this |
2376 | * separately from I_DIRTY_SYNC in order to implement |
2377 | * lazytime. This gets cleared if I_DIRTY_INODE |
2378 | * (I_DIRTY_SYNC and/or I_DIRTY_DATASYNC) gets set. I.e. |
2379 | * either I_DIRTY_TIME *or* I_DIRTY_INODE can be set in |
2380 | * i_state, but not both. I_DIRTY_PAGES may still be set. |
2381 | * I_NEW Serves as both a mutex and completion notification. |
2382 | * New inodes set I_NEW. If two processes both create |
2383 | * the same inode, one of them will release its inode and |
2384 | * wait for I_NEW to be released before returning. |
2385 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
2386 | * also cause waiting on I_NEW, without I_NEW actually |
2387 | * being set. find_inode() uses this to prevent returning |
2388 | * nearly-dead inodes. |
2389 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
2390 | * is zero. I_FREEING must be set when I_WILL_FREE is |
2391 | * cleared. |
2392 | * I_FREEING Set when inode is about to be freed but still has dirty |
2393 | * pages or buffers attached or the inode itself is still |
2394 | * dirty. |
2395 | * I_CLEAR Added by clear_inode(). In this state the inode is |
2396 | * clean and can be destroyed. Inode keeps I_FREEING. |
2397 | * |
2398 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
2399 | * prohibited for many purposes. iget() must wait for |
2400 | * the inode to be completely released, then create it |
2401 | * anew. Other functions will just ignore such inodes, |
2402 | * if appropriate. I_NEW is used for waiting. |
2403 | * |
2404 | * I_SYNC Writeback of inode is running. The bit is set during |
2405 | * data writeback, and cleared with a wakeup on the bit |
2406 | * address once it is done. The bit is also used to pin |
2407 | * the inode in memory for flusher thread. |
2408 | * |
2409 | * I_REFERENCED Marks the inode as recently references on the LRU list. |
2410 | * |
2411 | * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). |
2412 | * |
2413 | * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to |
2414 | * synchronize competing switching instances and to tell |
2415 | * wb stat updates to grab the i_pages lock. See |
2416 | * inode_switch_wbs_work_fn() for details. |
2417 | * |
2418 | * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper |
2419 | * and work dirs among overlayfs mounts. |
2420 | * |
2421 | * I_CREATING New object's inode in the middle of setting up. |
2422 | * |
2423 | * I_DONTCACHE Evict inode as soon as it is not used anymore. |
2424 | * |
2425 | * I_SYNC_QUEUED Inode is queued in b_io or b_more_io writeback lists. |
2426 | * Used to detect that mark_inode_dirty() should not move |
2427 | * inode between dirty lists. |
2428 | * |
2429 | * I_PINNING_FSCACHE_WB Inode is pinning an fscache object for writeback. |
2430 | * |
2431 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
2432 | */ |
2433 | #define I_DIRTY_SYNC (1 << 0) |
2434 | #define I_DIRTY_DATASYNC (1 << 1) |
2435 | #define I_DIRTY_PAGES (1 << 2) |
2436 | #define __I_NEW 3 |
2437 | #define I_NEW (1 << __I_NEW) |
2438 | #define I_WILL_FREE (1 << 4) |
2439 | #define I_FREEING (1 << 5) |
2440 | #define I_CLEAR (1 << 6) |
2441 | #define __I_SYNC 7 |
2442 | #define I_SYNC (1 << __I_SYNC) |
2443 | #define I_REFERENCED (1 << 8) |
2444 | #define __I_DIO_WAKEUP 9 |
2445 | #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP) |
2446 | #define I_LINKABLE (1 << 10) |
2447 | #define I_DIRTY_TIME (1 << 11) |
2448 | #define I_WB_SWITCH (1 << 13) |
2449 | #define I_OVL_INUSE (1 << 14) |
2450 | #define I_CREATING (1 << 15) |
2451 | #define I_DONTCACHE (1 << 16) |
2452 | #define I_SYNC_QUEUED (1 << 17) |
2453 | #define I_PINNING_FSCACHE_WB (1 << 18) |
2454 | |
2455 | #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC) |
2456 | #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES) |
2457 | #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) |
2458 | |
2459 | extern void __mark_inode_dirty(struct inode *, int); |
2460 | static inline void mark_inode_dirty(struct inode *inode) |
2461 | { |
2462 | __mark_inode_dirty(inode, I_DIRTY); |
2463 | } |
2464 | |
2465 | static inline void mark_inode_dirty_sync(struct inode *inode) |
2466 | { |
2467 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
2468 | } |
2469 | |
2470 | /* |
2471 | * Returns true if the given inode itself only has dirty timestamps (its pages |
2472 | * may still be dirty) and isn't currently being allocated or freed. |
2473 | * Filesystems should call this if when writing an inode when lazytime is |
2474 | * enabled, they want to opportunistically write the timestamps of other inodes |
2475 | * located very nearby on-disk, e.g. in the same inode block. This returns true |
2476 | * if the given inode is in need of such an opportunistic update. Requires |
2477 | * i_lock, or at least later re-checking under i_lock. |
2478 | */ |
2479 | static inline bool inode_is_dirtytime_only(struct inode *inode) |
2480 | { |
2481 | return (inode->i_state & (I_DIRTY_TIME | I_NEW | |
2482 | I_FREEING | I_WILL_FREE)) == I_DIRTY_TIME; |
2483 | } |
2484 | |
2485 | extern void inc_nlink(struct inode *inode); |
2486 | extern void drop_nlink(struct inode *inode); |
2487 | extern void clear_nlink(struct inode *inode); |
2488 | extern void set_nlink(struct inode *inode, unsigned int nlink); |
2489 | |
2490 | static inline void inode_inc_link_count(struct inode *inode) |
2491 | { |
2492 | inc_nlink(inode); |
2493 | mark_inode_dirty(inode); |
2494 | } |
2495 | |
2496 | static inline void inode_dec_link_count(struct inode *inode) |
2497 | { |
2498 | drop_nlink(inode); |
2499 | mark_inode_dirty(inode); |
2500 | } |
2501 | |
2502 | enum file_time_flags { |
2503 | S_ATIME = 1, |
2504 | S_MTIME = 2, |
2505 | S_CTIME = 4, |
2506 | S_VERSION = 8, |
2507 | }; |
2508 | |
2509 | extern bool atime_needs_update(const struct path *, struct inode *); |
2510 | extern void touch_atime(const struct path *); |
2511 | int inode_update_time(struct inode *inode, struct timespec64 *time, int flags); |
2512 | |
2513 | static inline void file_accessed(struct file *file) |
2514 | { |
2515 | if (!(file->f_flags & O_NOATIME)) |
2516 | touch_atime(&file->f_path); |
2517 | } |
2518 | |
2519 | extern int file_modified(struct file *file); |
2520 | int kiocb_modified(struct kiocb *iocb); |
2521 | |
2522 | int sync_inode_metadata(struct inode *inode, int wait); |
2523 | |
2524 | struct file_system_type { |
2525 | const char *name; |
2526 | int fs_flags; |
2527 | #define FS_REQUIRES_DEV 1 |
2528 | #define FS_BINARY_MOUNTDATA 2 |
2529 | #define FS_HAS_SUBTYPE 4 |
2530 | #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ |
2531 | #define FS_DISALLOW_NOTIFY_PERM 16 /* Disable fanotify permission events */ |
2532 | #define FS_ALLOW_IDMAP 32 /* FS has been updated to handle vfs idmappings. */ |
2533 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ |
2534 | int (*init_fs_context)(struct fs_context *); |
2535 | const struct fs_parameter_spec *parameters; |
2536 | struct dentry *(*mount) (struct file_system_type *, int, |
2537 | const char *, void *); |
2538 | void (*kill_sb) (struct super_block *); |
2539 | struct module *owner; |
2540 | struct file_system_type * next; |
2541 | struct hlist_head fs_supers; |
2542 | |
2543 | struct lock_class_key s_lock_key; |
2544 | struct lock_class_key s_umount_key; |
2545 | struct lock_class_key s_vfs_rename_key; |
2546 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; |
2547 | |
2548 | struct lock_class_key i_lock_key; |
2549 | struct lock_class_key i_mutex_key; |
2550 | struct lock_class_key invalidate_lock_key; |
2551 | struct lock_class_key i_mutex_dir_key; |
2552 | }; |
2553 | |
2554 | #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) |
2555 | |
2556 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
2557 | int flags, const char *dev_name, void *data, |
2558 | int (*fill_super)(struct super_block *, void *, int)); |
2559 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
2560 | int flags, void *data, |
2561 | int (*fill_super)(struct super_block *, void *, int)); |
2562 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
2563 | int flags, void *data, |
2564 | int (*fill_super)(struct super_block *, void *, int)); |
2565 | extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); |
2566 | void retire_super(struct super_block *sb); |
2567 | void generic_shutdown_super(struct super_block *sb); |
2568 | void kill_block_super(struct super_block *sb); |
2569 | void kill_anon_super(struct super_block *sb); |
2570 | void kill_litter_super(struct super_block *sb); |
2571 | void deactivate_super(struct super_block *sb); |
2572 | void deactivate_locked_super(struct super_block *sb); |
2573 | int set_anon_super(struct super_block *s, void *data); |
2574 | int set_anon_super_fc(struct super_block *s, struct fs_context *fc); |
2575 | int get_anon_bdev(dev_t *); |
2576 | void free_anon_bdev(dev_t); |
2577 | struct super_block *sget_fc(struct fs_context *fc, |
2578 | int (*test)(struct super_block *, struct fs_context *), |
2579 | int (*set)(struct super_block *, struct fs_context *)); |
2580 | struct super_block *sget(struct file_system_type *type, |
2581 | int (*test)(struct super_block *,void *), |
2582 | int (*set)(struct super_block *,void *), |
2583 | int flags, void *data); |
2584 | |
2585 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
2586 | #define fops_get(fops) \ |
2587 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
2588 | #define fops_put(fops) \ |
2589 | do { if (fops) module_put((fops)->owner); } while(0) |
2590 | /* |
2591 | * This one is to be used *ONLY* from ->open() instances. |
2592 | * fops must be non-NULL, pinned down *and* module dependencies |
2593 | * should be sufficient to pin the caller down as well. |
2594 | */ |
2595 | #define replace_fops(f, fops) \ |
2596 | do { \ |
2597 | struct file *__file = (f); \ |
2598 | fops_put(__file->f_op); \ |
2599 | BUG_ON(!(__file->f_op = (fops))); \ |
2600 | } while(0) |
2601 | |
2602 | extern int register_filesystem(struct file_system_type *); |
2603 | extern int unregister_filesystem(struct file_system_type *); |
2604 | extern int vfs_statfs(const struct path *, struct kstatfs *); |
2605 | extern int user_statfs(const char __user *, struct kstatfs *); |
2606 | extern int fd_statfs(int, struct kstatfs *); |
2607 | extern int freeze_super(struct super_block *super); |
2608 | extern int thaw_super(struct super_block *super); |
2609 | extern __printf(2, 3) |
2610 | int super_setup_bdi_name(struct super_block *sb, char *fmt, ...); |
2611 | extern int super_setup_bdi(struct super_block *sb); |
2612 | |
2613 | extern int current_umask(void); |
2614 | |
2615 | extern void ihold(struct inode * inode); |
2616 | extern void iput(struct inode *); |
2617 | extern int generic_update_time(struct inode *, struct timespec64 *, int); |
2618 | |
2619 | /* /sys/fs */ |
2620 | extern struct kobject *fs_kobj; |
2621 | |
2622 | #define MAX_RW_COUNT (INT_MAX & PAGE_MASK) |
2623 | |
2624 | #ifdef CONFIG_FILE_LOCKING |
2625 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2626 | { |
2627 | /* |
2628 | * Since this check is lockless, we must ensure that any refcounts |
2629 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2630 | * could end up racing with tasks trying to set a new lease on this |
2631 | * file. |
2632 | */ |
2633 | smp_mb(); |
2634 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
2635 | return __break_lease(inode, mode, FL_LEASE); |
2636 | return 0; |
2637 | } |
2638 | |
2639 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2640 | { |
2641 | /* |
2642 | * Since this check is lockless, we must ensure that any refcounts |
2643 | * taken are done before checking i_flctx->flc_lease. Otherwise, we |
2644 | * could end up racing with tasks trying to set a new lease on this |
2645 | * file. |
2646 | */ |
2647 | smp_mb(); |
2648 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
2649 | return __break_lease(inode, mode, FL_DELEG); |
2650 | return 0; |
2651 | } |
2652 | |
2653 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2654 | { |
2655 | int ret; |
2656 | |
2657 | ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); |
2658 | if (ret == -EWOULDBLOCK && delegated_inode) { |
2659 | *delegated_inode = inode; |
2660 | ihold(inode); |
2661 | } |
2662 | return ret; |
2663 | } |
2664 | |
2665 | static inline int break_deleg_wait(struct inode **delegated_inode) |
2666 | { |
2667 | int ret; |
2668 | |
2669 | ret = break_deleg(*delegated_inode, O_WRONLY); |
2670 | iput(*delegated_inode); |
2671 | *delegated_inode = NULL; |
2672 | return ret; |
2673 | } |
2674 | |
2675 | static inline int break_layout(struct inode *inode, bool wait) |
2676 | { |
2677 | smp_mb(); |
2678 | if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) |
2679 | return __break_lease(inode, |
2680 | wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, |
2681 | FL_LAYOUT); |
2682 | return 0; |
2683 | } |
2684 | |
2685 | #else /* !CONFIG_FILE_LOCKING */ |
2686 | static inline int break_lease(struct inode *inode, unsigned int mode) |
2687 | { |
2688 | return 0; |
2689 | } |
2690 | |
2691 | static inline int break_deleg(struct inode *inode, unsigned int mode) |
2692 | { |
2693 | return 0; |
2694 | } |
2695 | |
2696 | static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) |
2697 | { |
2698 | return 0; |
2699 | } |
2700 | |
2701 | static inline int break_deleg_wait(struct inode **delegated_inode) |
2702 | { |
2703 | BUG(); |
2704 | return 0; |
2705 | } |
2706 | |
2707 | static inline int break_layout(struct inode *inode, bool wait) |
2708 | { |
2709 | return 0; |
2710 | } |
2711 | |
2712 | #endif /* CONFIG_FILE_LOCKING */ |
2713 | |
2714 | /* fs/open.c */ |
2715 | struct audit_names; |
2716 | struct filename { |
2717 | const char *name; /* pointer to actual string */ |
2718 | const __user char *uptr; /* original userland pointer */ |
2719 | int refcnt; |
2720 | struct audit_names *aname; |
2721 | const char iname[]; |
2722 | }; |
2723 | static_assert(offsetof(struct filename, iname) % sizeof(long) == 0); |
2724 | |
2725 | static inline struct user_namespace *file_mnt_user_ns(struct file *file) |
2726 | { |
2727 | return mnt_user_ns(file->f_path.mnt); |
2728 | } |
2729 | |
2730 | /** |
2731 | * is_idmapped_mnt - check whether a mount is mapped |
2732 | * @mnt: the mount to check |
2733 | * |
2734 | * If @mnt has an idmapping attached different from the |
2735 | * filesystem's idmapping then @mnt is mapped. |
2736 | * |
2737 | * Return: true if mount is mapped, false if not. |
2738 | */ |
2739 | static inline bool is_idmapped_mnt(const struct vfsmount *mnt) |
2740 | { |
2741 | return mnt_user_ns(mnt) != mnt->mnt_sb->s_user_ns; |
2742 | } |
2743 | |
2744 | extern long vfs_truncate(const struct path *, loff_t); |
2745 | int do_truncate(struct user_namespace *, struct dentry *, loff_t start, |
2746 | unsigned int time_attrs, struct file *filp); |
2747 | extern int vfs_fallocate(struct file *file, int mode, loff_t offset, |
2748 | loff_t len); |
2749 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
2750 | umode_t mode); |
2751 | extern struct file *file_open_name(struct filename *, int, umode_t); |
2752 | extern struct file *filp_open(const char *, int, umode_t); |
2753 | extern struct file *file_open_root(const struct path *, |
2754 | const char *, int, umode_t); |
2755 | static inline struct file *file_open_root_mnt(struct vfsmount *mnt, |
2756 | const char *name, int flags, umode_t mode) |
2757 | { |
2758 | return file_open_root(&(struct path){.mnt = mnt, .dentry = mnt->mnt_root}, |
2759 | name, flags, mode); |
2760 | } |
2761 | extern struct file * dentry_open(const struct path *, int, const struct cred *); |
2762 | extern struct file *dentry_create(const struct path *path, int flags, |
2763 | umode_t mode, const struct cred *cred); |
2764 | extern struct file * open_with_fake_path(const struct path *, int, |
2765 | struct inode*, const struct cred *); |
2766 | static inline struct file *file_clone_open(struct file *file) |
2767 | { |
2768 | return dentry_open(&file->f_path, file->f_flags, file->f_cred); |
2769 | } |
2770 | extern int filp_close(struct file *, fl_owner_t id); |
2771 | |
2772 | extern struct filename *getname_flags(const char __user *, int, int *); |
2773 | extern struct filename *getname_uflags(const char __user *, int); |
2774 | extern struct filename *getname(const char __user *); |
2775 | extern struct filename *getname_kernel(const char *); |
2776 | extern void putname(struct filename *name); |
2777 | |
2778 | extern int finish_open(struct file *file, struct dentry *dentry, |
2779 | int (*open)(struct inode *, struct file *)); |
2780 | extern int finish_no_open(struct file *file, struct dentry *dentry); |
2781 | |
2782 | /* fs/dcache.c */ |
2783 | extern void __init vfs_caches_init_early(void); |
2784 | extern void __init vfs_caches_init(void); |
2785 | |
2786 | extern struct kmem_cache *names_cachep; |
2787 | |
2788 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
2789 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
2790 | |
2791 | extern struct super_block *blockdev_superblock; |
2792 | static inline bool sb_is_blkdev_sb(struct super_block *sb) |
2793 | { |
2794 | return IS_ENABLED(CONFIG_BLOCK) && sb == blockdev_superblock; |
2795 | } |
2796 | |
2797 | void emergency_thaw_all(void); |
2798 | extern int sync_filesystem(struct super_block *); |
2799 | extern const struct file_operations def_blk_fops; |
2800 | extern const struct file_operations def_chr_fops; |
2801 | |
2802 | /* fs/char_dev.c */ |
2803 | #define CHRDEV_MAJOR_MAX 512 |
2804 | /* Marks the bottom of the first segment of free char majors */ |
2805 | #define CHRDEV_MAJOR_DYN_END 234 |
2806 | /* Marks the top and bottom of the second segment of free char majors */ |
2807 | #define CHRDEV_MAJOR_DYN_EXT_START 511 |
2808 | #define CHRDEV_MAJOR_DYN_EXT_END 384 |
2809 | |
2810 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
2811 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
2812 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
2813 | unsigned int count, const char *name, |
2814 | const struct file_operations *fops); |
2815 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
2816 | unsigned int count, const char *name); |
2817 | extern void unregister_chrdev_region(dev_t, unsigned); |
2818 | extern void chrdev_show(struct seq_file *,off_t); |
2819 | |
2820 | static inline int register_chrdev(unsigned int major, const char *name, |
2821 | const struct file_operations *fops) |
2822 | { |
2823 | return __register_chrdev(major, 0, 256, name, fops); |
2824 | } |
2825 | |
2826 | static inline void unregister_chrdev(unsigned int major, const char *name) |
2827 | { |
2828 | __unregister_chrdev(major, 0, 256, name); |
2829 | } |
2830 | |
2831 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
2832 | |
2833 | /* Invalid inode operations -- fs/bad_inode.c */ |
2834 | extern void make_bad_inode(struct inode *); |
2835 | extern bool is_bad_inode(struct inode *); |
2836 | |
2837 | extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, |
2838 | loff_t lend); |
2839 | extern int __must_check file_check_and_advance_wb_err(struct file *file); |
2840 | extern int __must_check file_write_and_wait_range(struct file *file, |
2841 | loff_t start, loff_t end); |
2842 | |
2843 | static inline int file_write_and_wait(struct file *file) |
2844 | { |
2845 | return file_write_and_wait_range(file, 0, LLONG_MAX); |
2846 | } |
2847 | |
2848 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
2849 | int datasync); |
2850 | extern int vfs_fsync(struct file *file, int datasync); |
2851 | |
2852 | extern int sync_file_range(struct file *file, loff_t offset, loff_t nbytes, |
2853 | unsigned int flags); |
2854 | |
2855 | static inline bool iocb_is_dsync(const struct kiocb *iocb) |
2856 | { |
2857 | return (iocb->ki_flags & IOCB_DSYNC) || |
2858 | IS_SYNC(iocb->ki_filp->f_mapping->host); |
2859 | } |
2860 | |
2861 | /* |
2862 | * Sync the bytes written if this was a synchronous write. Expect ki_pos |
2863 | * to already be updated for the write, and will return either the amount |
2864 | * of bytes passed in, or an error if syncing the file failed. |
2865 | */ |
2866 | static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) |
2867 | { |
2868 | if (iocb_is_dsync(iocb)) { |
2869 | int ret = vfs_fsync_range(iocb->ki_filp, |
2870 | iocb->ki_pos - count, iocb->ki_pos - 1, |
2871 | (iocb->ki_flags & IOCB_SYNC) ? 0 : 1); |
2872 | if (ret) |
2873 | return ret; |
2874 | } |
2875 | |
2876 | return count; |
2877 | } |
2878 | |
2879 | extern void emergency_sync(void); |
2880 | extern void emergency_remount(void); |
2881 | |
2882 | #ifdef CONFIG_BLOCK |
2883 | extern int bmap(struct inode *inode, sector_t *block); |
2884 | #else |
2885 | static inline int bmap(struct inode *inode, sector_t *block) |
2886 | { |
2887 | return -EINVAL; |
2888 | } |
2889 | #endif |
2890 | |
2891 | int notify_change(struct user_namespace *, struct dentry *, |
2892 | struct iattr *, struct inode **); |
2893 | int inode_permission(struct user_namespace *, struct inode *, int); |
2894 | int generic_permission(struct user_namespace *, struct inode *, int); |
2895 | static inline int file_permission(struct file *file, int mask) |
2896 | { |
2897 | return inode_permission(file_mnt_user_ns(file), |
2898 | file_inode(file), mask); |
2899 | } |
2900 | static inline int path_permission(const struct path *path, int mask) |
2901 | { |
2902 | return inode_permission(mnt_user_ns(path->mnt), |
2903 | d_inode(path->dentry), mask); |
2904 | } |
2905 | int __check_sticky(struct user_namespace *mnt_userns, struct inode *dir, |
2906 | struct inode *inode); |
2907 | |
2908 | static inline bool execute_ok(struct inode *inode) |
2909 | { |
2910 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
2911 | } |
2912 | |
2913 | static inline bool inode_wrong_type(const struct inode *inode, umode_t mode) |
2914 | { |
2915 | return (inode->i_mode ^ mode) & S_IFMT; |
2916 | } |
2917 | |
2918 | static inline void file_start_write(struct file *file) |
2919 | { |
2920 | if (!S_ISREG(file_inode(file)->i_mode)) |
2921 | return; |
2922 | sb_start_write(file_inode(file)->i_sb); |
2923 | } |
2924 | |
2925 | static inline bool file_start_write_trylock(struct file *file) |
2926 | { |
2927 | if (!S_ISREG(file_inode(file)->i_mode)) |
2928 | return true; |
2929 | return sb_start_write_trylock(file_inode(file)->i_sb); |
2930 | } |
2931 | |
2932 | static inline void file_end_write(struct file *file) |
2933 | { |
2934 | if (!S_ISREG(file_inode(file)->i_mode)) |
2935 | return; |
2936 | __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); |
2937 | } |
2938 | |
2939 | /* |
2940 | * This is used for regular files where some users -- especially the |
2941 | * currently executed binary in a process, previously handled via |
2942 | * VM_DENYWRITE -- cannot handle concurrent write (and maybe mmap |
2943 | * read-write shared) accesses. |
2944 | * |
2945 | * get_write_access() gets write permission for a file. |
2946 | * put_write_access() releases this write permission. |
2947 | * deny_write_access() denies write access to a file. |
2948 | * allow_write_access() re-enables write access to a file. |
2949 | * |
2950 | * The i_writecount field of an inode can have the following values: |
2951 | * 0: no write access, no denied write access |
2952 | * < 0: (-i_writecount) users that denied write access to the file. |
2953 | * > 0: (i_writecount) users that have write access to the file. |
2954 | * |
2955 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe |
2956 | * except for the cases where we don't hold i_writecount yet. Then we need to |
2957 | * use {get,deny}_write_access() - these functions check the sign and refuse |
2958 | * to do the change if sign is wrong. |
2959 | */ |
2960 | static inline int get_write_access(struct inode *inode) |
2961 | { |
2962 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; |
2963 | } |
2964 | static inline int deny_write_access(struct file *file) |
2965 | { |
2966 | struct inode *inode = file_inode(file); |
2967 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
2968 | } |
2969 | static inline void put_write_access(struct inode * inode) |
2970 | { |
2971 | atomic_dec(&inode->i_writecount); |
2972 | } |
2973 | static inline void allow_write_access(struct file *file) |
2974 | { |
2975 | if (file) |
2976 | atomic_inc(&file_inode(file)->i_writecount); |
2977 | } |
2978 | static inline bool inode_is_open_for_write(const struct inode *inode) |
2979 | { |
2980 | return atomic_read(&inode->i_writecount) > 0; |
2981 | } |
2982 | |
2983 | #if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING) |
2984 | static inline void i_readcount_dec(struct inode *inode) |
2985 | { |
2986 | BUG_ON(!atomic_read(&inode->i_readcount)); |
2987 | atomic_dec(&inode->i_readcount); |
2988 | } |
2989 | static inline void i_readcount_inc(struct inode *inode) |
2990 | { |
2991 | atomic_inc(&inode->i_readcount); |
2992 | } |
2993 | #else |
2994 | static inline void i_readcount_dec(struct inode *inode) |
2995 | { |
2996 | return; |
2997 | } |
2998 | static inline void i_readcount_inc(struct inode *inode) |
2999 | { |
3000 | return; |
3001 | } |
3002 | #endif |
3003 | extern int do_pipe_flags(int *, int); |
3004 | |
3005 | extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *); |
3006 | ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos); |
3007 | extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *); |
3008 | extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *); |
3009 | extern struct file * open_exec(const char *); |
3010 | |
3011 | /* fs/dcache.c -- generic fs support functions */ |
3012 | extern bool is_subdir(struct dentry *, struct dentry *); |
3013 | extern bool path_is_under(const struct path *, const struct path *); |
3014 | |
3015 | extern char *file_path(struct file *, char *, int); |
3016 | |
3017 | #include <linux/err.h> |
3018 | |
3019 | /* needed for stackable file system support */ |
3020 | extern loff_t default_llseek(struct file *file, loff_t offset, int whence); |
3021 | |
3022 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); |
3023 | |
3024 | extern int inode_init_always(struct super_block *, struct inode *); |
3025 | extern void inode_init_once(struct inode *); |
3026 | extern void address_space_init_once(struct address_space *mapping); |
3027 | extern struct inode * igrab(struct inode *); |
3028 | extern ino_t iunique(struct super_block *, ino_t); |
3029 | extern int inode_needs_sync(struct inode *inode); |
3030 | extern int generic_delete_inode(struct inode *inode); |
3031 | static inline int generic_drop_inode(struct inode *inode) |
3032 | { |
3033 | return !inode->i_nlink || inode_unhashed(inode); |
3034 | } |
3035 | extern void d_mark_dontcache(struct inode *inode); |
3036 | |
3037 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
3038 | unsigned long hashval, int (*test)(struct inode *, void *), |
3039 | void *data); |
3040 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
3041 | int (*test)(struct inode *, void *), void *data); |
3042 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
3043 | |
3044 | extern struct inode *inode_insert5(struct inode *inode, unsigned long hashval, |
3045 | int (*test)(struct inode *, void *), |
3046 | int (*set)(struct inode *, void *), |
3047 | void *data); |
3048 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
3049 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
3050 | extern struct inode *find_inode_nowait(struct super_block *, |
3051 | unsigned long, |
3052 | int (*match)(struct inode *, |
3053 | unsigned long, void *), |
3054 | void *data); |
3055 | extern struct inode *find_inode_rcu(struct super_block *, unsigned long, |
3056 | int (*)(struct inode *, void *), void *); |
3057 | extern struct inode *find_inode_by_ino_rcu(struct super_block *, unsigned long); |
3058 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
3059 | extern int insert_inode_locked(struct inode *); |
3060 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
3061 | extern void lockdep_annotate_inode_mutex_key(struct inode *inode); |
3062 | #else |
3063 | static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; |
3064 | #endif |
3065 | extern void unlock_new_inode(struct inode *); |
3066 | extern void discard_new_inode(struct inode *); |
3067 | extern unsigned int get_next_ino(void); |
3068 | extern void evict_inodes(struct super_block *sb); |
3069 | void dump_mapping(const struct address_space *); |
3070 | |
3071 | /* |
3072 | * Userspace may rely on the the inode number being non-zero. For example, glibc |
3073 | * simply ignores files with zero i_ino in unlink() and other places. |
3074 | * |
3075 | * As an additional complication, if userspace was compiled with |
3076 | * _FILE_OFFSET_BITS=32 on a 64-bit kernel we'll only end up reading out the |
3077 | * lower 32 bits, so we need to check that those aren't zero explicitly. With |
3078 | * _FILE_OFFSET_BITS=64, this may cause some harmless false-negatives, but |
3079 | * better safe than sorry. |
3080 | */ |
3081 | static inline bool is_zero_ino(ino_t ino) |
3082 | { |
3083 | return (u32)ino == 0; |
3084 | } |
3085 | |
3086 | extern void __iget(struct inode * inode); |
3087 | extern void iget_failed(struct inode *); |
3088 | extern void clear_inode(struct inode *); |
3089 | extern void __destroy_inode(struct inode *); |
3090 | extern struct inode *new_inode_pseudo(struct super_block *sb); |
3091 | extern struct inode *new_inode(struct super_block *sb); |
3092 | extern void free_inode_nonrcu(struct inode *inode); |
3093 | extern int should_remove_suid(struct dentry *); |
3094 | extern int file_remove_privs(struct file *); |
3095 | |
3096 | /* |
3097 | * This must be used for allocating filesystems specific inodes to set |
3098 | * up the inode reclaim context correctly. |
3099 | */ |
3100 | static inline void * |
3101 | alloc_inode_sb(struct super_block *sb, struct kmem_cache *cache, gfp_t gfp) |
3102 | { |
3103 | return kmem_cache_alloc_lru(cache, &sb->s_inode_lru, gfp); |
3104 | } |
3105 | |
3106 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
3107 | static inline void insert_inode_hash(struct inode *inode) |
3108 | { |
3109 | __insert_inode_hash(inode, inode->i_ino); |
3110 | } |
3111 | |
3112 | extern void __remove_inode_hash(struct inode *); |
3113 | static inline void remove_inode_hash(struct inode *inode) |
3114 | { |
3115 | if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash)) |
3116 | __remove_inode_hash(inode); |
3117 | } |
3118 | |
3119 | extern void inode_sb_list_add(struct inode *inode); |
3120 | extern void inode_add_lru(struct inode *inode); |
3121 | |
3122 | extern int sb_set_blocksize(struct super_block *, int); |
3123 | extern int sb_min_blocksize(struct super_block *, int); |
3124 | |
3125 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
3126 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
3127 | extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); |
3128 | int generic_write_checks_count(struct kiocb *iocb, loff_t *count); |
3129 | extern int generic_write_check_limits(struct file *file, loff_t pos, |
3130 | loff_t *count); |
3131 | extern int generic_file_rw_checks(struct file *file_in, struct file *file_out); |
3132 | ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *to, |
3133 | ssize_t already_read); |
3134 | extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); |
3135 | extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); |
3136 | extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); |
3137 | extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *); |
3138 | ssize_t generic_perform_write(struct kiocb *, struct iov_iter *); |
3139 | |
3140 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, |
3141 | rwf_t flags); |
3142 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, |
3143 | rwf_t flags); |
3144 | ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb, |
3145 | struct iov_iter *iter); |
3146 | ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, |
3147 | struct iov_iter *iter); |
3148 | |
3149 | /* fs/splice.c */ |
3150 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
3151 | struct pipe_inode_info *, size_t, unsigned int); |
3152 | extern ssize_t iter_file_splice_write(struct pipe_inode_info *, |
3153 | struct file *, loff_t *, size_t, unsigned int); |
3154 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
3155 | struct file *out, loff_t *, size_t len, unsigned int flags); |
3156 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
3157 | loff_t *opos, size_t len, unsigned int flags); |
3158 | |
3159 | |
3160 | extern void |
3161 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
3162 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); |
3163 | #define no_llseek NULL |
3164 | extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); |
3165 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); |
3166 | extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, |
3167 | int whence, loff_t maxsize, loff_t eof); |
3168 | extern loff_t fixed_size_llseek(struct file *file, loff_t offset, |
3169 | int whence, loff_t size); |
3170 | extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t); |
3171 | extern loff_t no_seek_end_llseek(struct file *, loff_t, int); |
3172 | int rw_verify_area(int, struct file *, const loff_t *, size_t); |
3173 | extern int generic_file_open(struct inode * inode, struct file * filp); |
3174 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
3175 | extern int stream_open(struct inode * inode, struct file * filp); |
3176 | |
3177 | #ifdef CONFIG_BLOCK |
3178 | typedef void (dio_submit_t)(struct bio *bio, struct inode *inode, |
3179 | loff_t file_offset); |
3180 | |
3181 | enum { |
3182 | /* need locking between buffered and direct access */ |
3183 | DIO_LOCKING = 0x01, |
3184 | |
3185 | /* filesystem does not support filling holes */ |
3186 | DIO_SKIP_HOLES = 0x02, |
3187 | }; |
3188 | |
3189 | ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, |
3190 | struct block_device *bdev, struct iov_iter *iter, |
3191 | get_block_t get_block, |
3192 | dio_iodone_t end_io, dio_submit_t submit_io, |
3193 | int flags); |
3194 | |
3195 | static inline ssize_t blockdev_direct_IO(struct kiocb *iocb, |
3196 | struct inode *inode, |
3197 | struct iov_iter *iter, |
3198 | get_block_t get_block) |
3199 | { |
3200 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
3201 | get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES); |
3202 | } |
3203 | #endif |
3204 | |
3205 | void inode_dio_wait(struct inode *inode); |
3206 | |
3207 | /** |
3208 | * inode_dio_begin - signal start of a direct I/O requests |
3209 | * @inode: inode the direct I/O happens on |
3210 | * |
3211 | * This is called once we've finished processing a direct I/O request, |
3212 | * and is used to wake up callers waiting for direct I/O to be quiesced. |
3213 | */ |
3214 | static inline void inode_dio_begin(struct inode *inode) |
3215 | { |
3216 | atomic_inc(&inode->i_dio_count); |
3217 | } |
3218 | |
3219 | /** |
3220 | * inode_dio_end - signal finish of a direct I/O requests |
3221 | * @inode: inode the direct I/O happens on |
3222 | * |
3223 | * This is called once we've finished processing a direct I/O request, |
3224 | * and is used to wake up callers waiting for direct I/O to be quiesced. |
3225 | */ |
3226 | static inline void inode_dio_end(struct inode *inode) |
3227 | { |
3228 | if (atomic_dec_and_test(&inode->i_dio_count)) |
3229 | wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); |
3230 | } |
3231 | |
3232 | /* |
3233 | * Warn about a page cache invalidation failure diring a direct I/O write. |
3234 | */ |
3235 | void dio_warn_stale_pagecache(struct file *filp); |
3236 | |
3237 | extern void inode_set_flags(struct inode *inode, unsigned int flags, |
3238 | unsigned int mask); |
3239 | |
3240 | extern const struct file_operations generic_ro_fops; |
3241 | |
3242 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
3243 | |
3244 | extern int readlink_copy(char __user *, int, const char *); |
3245 | extern int page_readlink(struct dentry *, char __user *, int); |
3246 | extern const char *page_get_link(struct dentry *, struct inode *, |
3247 | struct delayed_call *); |
3248 | extern void page_put_link(void *); |
3249 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
3250 | extern const struct inode_operations page_symlink_inode_operations; |
3251 | extern void kfree_link(void *); |
3252 | void generic_fillattr(struct user_namespace *, struct inode *, struct kstat *); |
3253 | void generic_fill_statx_attr(struct inode *inode, struct kstat *stat); |
3254 | extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int); |
3255 | extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int); |
3256 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
3257 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
3258 | void __inode_sub_bytes(struct inode *inode, loff_t bytes); |
3259 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
3260 | static inline loff_t __inode_get_bytes(struct inode *inode) |
3261 | { |
3262 | return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; |
3263 | } |
3264 | loff_t inode_get_bytes(struct inode *inode); |
3265 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
3266 | const char *simple_get_link(struct dentry *, struct inode *, |
3267 | struct delayed_call *); |
3268 | extern const struct inode_operations simple_symlink_inode_operations; |
3269 | |
3270 | extern int iterate_dir(struct file *, struct dir_context *); |
3271 | |
3272 | int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat, |
3273 | int flags); |
3274 | int vfs_fstat(int fd, struct kstat *stat); |
3275 | |
3276 | static inline int vfs_stat(const char __user *filename, struct kstat *stat) |
3277 | { |
3278 | return vfs_fstatat(AT_FDCWD, filename, stat, 0); |
3279 | } |
3280 | static inline int vfs_lstat(const char __user *name, struct kstat *stat) |
3281 | { |
3282 | return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW); |
3283 | } |
3284 | |
3285 | extern const char *vfs_get_link(struct dentry *, struct delayed_call *); |
3286 | extern int vfs_readlink(struct dentry *, char __user *, int); |
3287 | |
3288 | extern struct file_system_type *get_filesystem(struct file_system_type *fs); |
3289 | extern void put_filesystem(struct file_system_type *fs); |
3290 | extern struct file_system_type *get_fs_type(const char *name); |
3291 | extern struct super_block *get_super(struct block_device *); |
3292 | extern struct super_block *get_active_super(struct block_device *bdev); |
3293 | extern void drop_super(struct super_block *sb); |
3294 | extern void drop_super_exclusive(struct super_block *sb); |
3295 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
3296 | extern void iterate_supers_type(struct file_system_type *, |
3297 | void (*)(struct super_block *, void *), void *); |
3298 | |
3299 | extern int dcache_dir_open(struct inode *, struct file *); |
3300 | extern int dcache_dir_close(struct inode *, struct file *); |
3301 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
3302 | extern int dcache_readdir(struct file *, struct dir_context *); |
3303 | extern int simple_setattr(struct user_namespace *, struct dentry *, |
3304 | struct iattr *); |
3305 | extern int simple_getattr(struct user_namespace *, const struct path *, |
3306 | struct kstat *, u32, unsigned int); |
3307 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
3308 | extern int simple_open(struct inode *inode, struct file *file); |
3309 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
3310 | extern int simple_unlink(struct inode *, struct dentry *); |
3311 | extern int simple_rmdir(struct inode *, struct dentry *); |
3312 | extern int simple_rename_exchange(struct inode *old_dir, struct dentry *old_dentry, |
3313 | struct inode *new_dir, struct dentry *new_dentry); |
3314 | extern int simple_rename(struct user_namespace *, struct inode *, |
3315 | struct dentry *, struct inode *, struct dentry *, |
3316 | unsigned int); |
3317 | extern void simple_recursive_removal(struct dentry *, |
3318 | void (*callback)(struct dentry *)); |
3319 | extern int noop_fsync(struct file *, loff_t, loff_t, int); |
3320 | extern ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter); |
3321 | extern int simple_empty(struct dentry *); |
3322 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
3323 | loff_t pos, unsigned len, |
3324 | struct page **pagep, void **fsdata); |
3325 | extern const struct address_space_operations ram_aops; |
3326 | extern int always_delete_dentry(const struct dentry *); |
3327 | extern struct inode *alloc_anon_inode(struct super_block *); |
3328 | extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); |
3329 | extern const struct dentry_operations simple_dentry_operations; |
3330 | |
3331 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); |
3332 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
3333 | extern const struct file_operations simple_dir_operations; |
3334 | extern const struct inode_operations simple_dir_inode_operations; |
3335 | extern void make_empty_dir_inode(struct inode *inode); |
3336 | extern bool is_empty_dir_inode(struct inode *inode); |
3337 | struct tree_descr { const char *name; const struct file_operations *ops; int mode; }; |
3338 | struct dentry *d_alloc_name(struct dentry *, const char *); |
3339 | extern int simple_fill_super(struct super_block *, unsigned long, |
3340 | const struct tree_descr *); |
3341 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
3342 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
3343 | |
3344 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
3345 | loff_t *ppos, const void *from, size_t available); |
3346 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
3347 | const void __user *from, size_t count); |
3348 | |
3349 | extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); |
3350 | extern int generic_file_fsync(struct file *, loff_t, loff_t, int); |
3351 | |
3352 | extern int generic_check_addressable(unsigned, u64); |
3353 | |
3354 | extern void generic_set_encrypted_ci_d_ops(struct dentry *dentry); |
3355 | |
3356 | int may_setattr(struct user_namespace *mnt_userns, struct inode *inode, |
3357 | unsigned int ia_valid); |
3358 | int setattr_prepare(struct user_namespace *, struct dentry *, struct iattr *); |
3359 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
3360 | void setattr_copy(struct user_namespace *, struct inode *inode, |
3361 | const struct iattr *attr); |
3362 | |
3363 | extern int file_update_time(struct file *file); |
3364 | |
3365 | static inline bool vma_is_dax(const struct vm_area_struct *vma) |
3366 | { |
3367 | return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); |
3368 | } |
3369 | |
3370 | static inline bool vma_is_fsdax(struct vm_area_struct *vma) |
3371 | { |
3372 | struct inode *inode; |
3373 | |
3374 | if (!IS_ENABLED(CONFIG_FS_DAX) || !vma->vm_file) |
3375 | return false; |
3376 | if (!vma_is_dax(vma)) |
3377 | return false; |
3378 | inode = file_inode(vma->vm_file); |
3379 | if (S_ISCHR(inode->i_mode)) |
3380 | return false; /* device-dax */ |
3381 | return true; |
3382 | } |
3383 | |
3384 | static inline int iocb_flags(struct file *file) |
3385 | { |
3386 | int res = 0; |
3387 | if (file->f_flags & O_APPEND) |
3388 | res |= IOCB_APPEND; |
3389 | if (file->f_flags & O_DIRECT) |
3390 | res |= IOCB_DIRECT; |
3391 | if (file->f_flags & O_DSYNC) |
3392 | res |= IOCB_DSYNC; |
3393 | if (file->f_flags & __O_SYNC) |
3394 | res |= IOCB_SYNC; |
3395 | return res; |
3396 | } |
3397 | |
3398 | static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) |
3399 | { |
3400 | int kiocb_flags = 0; |
3401 | |
3402 | /* make sure there's no overlap between RWF and private IOCB flags */ |
3403 | BUILD_BUG_ON((__force int) RWF_SUPPORTED & IOCB_EVENTFD); |
3404 | |
3405 | if (!flags) |
3406 | return 0; |
3407 | if (unlikely(flags & ~RWF_SUPPORTED)) |
3408 | return -EOPNOTSUPP; |
3409 | |
3410 | if (flags & RWF_NOWAIT) { |
3411 | if (!(ki->ki_filp->f_mode & FMODE_NOWAIT)) |
3412 | return -EOPNOTSUPP; |
3413 | kiocb_flags |= IOCB_NOIO; |
3414 | } |
3415 | kiocb_flags |= (__force int) (flags & RWF_SUPPORTED); |
3416 | if (flags & RWF_SYNC) |
3417 | kiocb_flags |= IOCB_DSYNC; |
3418 | |
3419 | ki->ki_flags |= kiocb_flags; |
3420 | return 0; |
3421 | } |
3422 | |
3423 | static inline ino_t parent_ino(struct dentry *dentry) |
3424 | { |
3425 | ino_t res; |
3426 | |
3427 | /* |
3428 | * Don't strictly need d_lock here? If the parent ino could change |
3429 | * then surely we'd have a deeper race in the caller? |
3430 | */ |
3431 | spin_lock(&dentry->d_lock); |
3432 | res = dentry->d_parent->d_inode->i_ino; |
3433 | spin_unlock(&dentry->d_lock); |
3434 | return res; |
3435 | } |
3436 | |
3437 | /* Transaction based IO helpers */ |
3438 | |
3439 | /* |
3440 | * An argresp is stored in an allocated page and holds the |
3441 | * size of the argument or response, along with its content |
3442 | */ |
3443 | struct simple_transaction_argresp { |
3444 | ssize_t size; |
3445 | char data[]; |
3446 | }; |
3447 | |
3448 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
3449 | |
3450 | char *simple_transaction_get(struct file *file, const char __user *buf, |
3451 | size_t size); |
3452 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
3453 | size_t size, loff_t *pos); |
3454 | int simple_transaction_release(struct inode *inode, struct file *file); |
3455 | |
3456 | void simple_transaction_set(struct file *file, size_t n); |
3457 | |
3458 | /* |
3459 | * simple attribute files |
3460 | * |
3461 | * These attributes behave similar to those in sysfs: |
3462 | * |
3463 | * Writing to an attribute immediately sets a value, an open file can be |
3464 | * written to multiple times. |
3465 | * |
3466 | * Reading from an attribute creates a buffer from the value that might get |
3467 | * read with multiple read calls. When the attribute has been read |
3468 | * completely, no further read calls are possible until the file is opened |
3469 | * again. |
3470 | * |
3471 | * All attributes contain a text representation of a numeric value |
3472 | * that are accessed with the get() and set() functions. |
3473 | */ |
3474 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
3475 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
3476 | { \ |
3477 | __simple_attr_check_format(__fmt, 0ull); \ |
3478 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
3479 | } \ |
3480 | static const struct file_operations __fops = { \ |
3481 | .owner = THIS_MODULE, \ |
3482 | .open = __fops ## _open, \ |
3483 | .release = simple_attr_release, \ |
3484 | .read = simple_attr_read, \ |
3485 | .write = simple_attr_write, \ |
3486 | .llseek = generic_file_llseek, \ |
3487 | } |
3488 | |
3489 | static inline __printf(1, 2) |
3490 | void __simple_attr_check_format(const char *fmt, ...) |
3491 | { |
3492 | /* don't do anything, just let the compiler check the arguments; */ |
3493 | } |
3494 | |
3495 | int simple_attr_open(struct inode *inode, struct file *file, |
3496 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
3497 | const char *fmt); |
3498 | int simple_attr_release(struct inode *inode, struct file *file); |
3499 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
3500 | size_t len, loff_t *ppos); |
3501 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
3502 | size_t len, loff_t *ppos); |
3503 | |
3504 | struct ctl_table; |
3505 | int __init list_bdev_fs_names(char *buf, size_t size); |
3506 | |
3507 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
3508 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
3509 | |
3510 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
3511 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
3512 | (flag & __FMODE_NONOTIFY))) |
3513 | |
3514 | static inline bool is_sxid(umode_t mode) |
3515 | { |
3516 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); |
3517 | } |
3518 | |
3519 | static inline int check_sticky(struct user_namespace *mnt_userns, |
3520 | struct inode *dir, struct inode *inode) |
3521 | { |
3522 | if (!(dir->i_mode & S_ISVTX)) |
3523 | return 0; |
3524 | |
3525 | return __check_sticky(mnt_userns, dir, inode); |
3526 | } |
3527 | |
3528 | static inline void inode_has_no_xattr(struct inode *inode) |
3529 | { |
3530 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC)) |
3531 | inode->i_flags |= S_NOSEC; |
3532 | } |
3533 | |
3534 | static inline bool is_root_inode(struct inode *inode) |
3535 | { |
3536 | return inode == inode->i_sb->s_root->d_inode; |
3537 | } |
3538 | |
3539 | static inline bool dir_emit(struct dir_context *ctx, |
3540 | const char *name, int namelen, |
3541 | u64 ino, unsigned type) |
3542 | { |
3543 | return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; |
3544 | } |
3545 | static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) |
3546 | { |
3547 | return ctx->actor(ctx, "." , 1, ctx->pos, |
3548 | file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; |
3549 | } |
3550 | static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) |
3551 | { |
3552 | return ctx->actor(ctx, ".." , 2, ctx->pos, |
3553 | parent_ino(file->f_path.dentry), DT_DIR) == 0; |
3554 | } |
3555 | static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) |
3556 | { |
3557 | if (ctx->pos == 0) { |
3558 | if (!dir_emit_dot(file, ctx)) |
3559 | return false; |
3560 | ctx->pos = 1; |
3561 | } |
3562 | if (ctx->pos == 1) { |
3563 | if (!dir_emit_dotdot(file, ctx)) |
3564 | return false; |
3565 | ctx->pos = 2; |
3566 | } |
3567 | return true; |
3568 | } |
3569 | static inline bool dir_relax(struct inode *inode) |
3570 | { |
3571 | inode_unlock(inode); |
3572 | inode_lock(inode); |
3573 | return !IS_DEADDIR(inode); |
3574 | } |
3575 | |
3576 | static inline bool dir_relax_shared(struct inode *inode) |
3577 | { |
3578 | inode_unlock_shared(inode); |
3579 | inode_lock_shared(inode); |
3580 | return !IS_DEADDIR(inode); |
3581 | } |
3582 | |
3583 | extern bool path_noexec(const struct path *path); |
3584 | extern void inode_nohighmem(struct inode *inode); |
3585 | |
3586 | /* mm/fadvise.c */ |
3587 | extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len, |
3588 | int advice); |
3589 | extern int generic_fadvise(struct file *file, loff_t offset, loff_t len, |
3590 | int advice); |
3591 | |
3592 | #endif /* _LINUX_FS_H */ |
3593 | |