1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. |
4 | */ |
5 | |
6 | #ifndef BTRFS_INODE_H |
7 | #define BTRFS_INODE_H |
8 | |
9 | #include <linux/hash.h> |
10 | #include <linux/refcount.h> |
11 | #include <linux/spinlock.h> |
12 | #include <linux/mutex.h> |
13 | #include <linux/rwsem.h> |
14 | #include <linux/fs.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/compiler.h> |
17 | #include <linux/fscrypt.h> |
18 | #include <linux/lockdep.h> |
19 | #include <uapi/linux/btrfs_tree.h> |
20 | #include <trace/events/btrfs.h> |
21 | #include "block-rsv.h" |
22 | #include "btrfs_inode.h" |
23 | #include "extent_map.h" |
24 | #include "extent_io.h" |
25 | #include "extent-io-tree.h" |
26 | #include "ordered-data.h" |
27 | #include "delayed-inode.h" |
28 | |
29 | struct extent_state; |
30 | struct posix_acl; |
31 | struct iov_iter; |
32 | struct writeback_control; |
33 | struct btrfs_root; |
34 | struct btrfs_fs_info; |
35 | struct btrfs_trans_handle; |
36 | |
37 | /* |
38 | * Since we search a directory based on f_pos (struct dir_context::pos) we have |
39 | * to start at 2 since '.' and '..' have f_pos of 0 and 1 respectively, so |
40 | * everybody else has to start at 2 (see btrfs_real_readdir() and dir_emit_dots()). |
41 | */ |
42 | #define BTRFS_DIR_START_INDEX 2 |
43 | |
44 | /* |
45 | * ordered_data_close is set by truncate when a file that used |
46 | * to have good data has been truncated to zero. When it is set |
47 | * the btrfs file release call will add this inode to the |
48 | * ordered operations list so that we make sure to flush out any |
49 | * new data the application may have written before commit. |
50 | */ |
51 | enum { |
52 | BTRFS_INODE_FLUSH_ON_CLOSE, |
53 | BTRFS_INODE_DUMMY, |
54 | BTRFS_INODE_IN_DEFRAG, |
55 | BTRFS_INODE_HAS_ASYNC_EXTENT, |
56 | /* |
57 | * Always set under the VFS' inode lock, otherwise it can cause races |
58 | * during fsync (we start as a fast fsync and then end up in a full |
59 | * fsync racing with ordered extent completion). |
60 | */ |
61 | BTRFS_INODE_NEEDS_FULL_SYNC, |
62 | BTRFS_INODE_COPY_EVERYTHING, |
63 | BTRFS_INODE_HAS_PROPS, |
64 | BTRFS_INODE_SNAPSHOT_FLUSH, |
65 | /* |
66 | * Set and used when logging an inode and it serves to signal that an |
67 | * inode does not have xattrs, so subsequent fsyncs can avoid searching |
68 | * for xattrs to log. This bit must be cleared whenever a xattr is added |
69 | * to an inode. |
70 | */ |
71 | BTRFS_INODE_NO_XATTRS, |
72 | /* |
73 | * Set when we are in a context where we need to start a transaction and |
74 | * have dirty pages with the respective file range locked. This is to |
75 | * ensure that when reserving space for the transaction, if we are low |
76 | * on available space and need to flush delalloc, we will not flush |
77 | * delalloc for this inode, because that could result in a deadlock (on |
78 | * the file range, inode's io_tree). |
79 | */ |
80 | BTRFS_INODE_NO_DELALLOC_FLUSH, |
81 | /* |
82 | * Set when we are working on enabling verity for a file. Computing and |
83 | * writing the whole Merkle tree can take a while so we want to prevent |
84 | * races where two separate tasks attempt to simultaneously start verity |
85 | * on the same file. |
86 | */ |
87 | BTRFS_INODE_VERITY_IN_PROGRESS, |
88 | /* Set when this inode is a free space inode. */ |
89 | BTRFS_INODE_FREE_SPACE_INODE, |
90 | /* Set when there are no capabilities in XATTs for the inode. */ |
91 | BTRFS_INODE_NO_CAP_XATTR, |
92 | }; |
93 | |
94 | /* in memory btrfs inode */ |
95 | struct btrfs_inode { |
96 | /* which subvolume this inode belongs to */ |
97 | struct btrfs_root *root; |
98 | |
99 | /* key used to find this inode on disk. This is used by the code |
100 | * to read in roots of subvolumes |
101 | */ |
102 | struct btrfs_key location; |
103 | |
104 | /* Cached value of inode property 'compression'. */ |
105 | u8 prop_compress; |
106 | |
107 | /* |
108 | * Force compression on the file using the defrag ioctl, could be |
109 | * different from prop_compress and takes precedence if set. |
110 | */ |
111 | u8 defrag_compress; |
112 | |
113 | /* |
114 | * Lock for counters and all fields used to determine if the inode is in |
115 | * the log or not (last_trans, last_sub_trans, last_log_commit, |
116 | * logged_trans), to access/update delalloc_bytes, new_delalloc_bytes, |
117 | * defrag_bytes, disk_i_size, outstanding_extents, csum_bytes and to |
118 | * update the VFS' inode number of bytes used. |
119 | */ |
120 | spinlock_t lock; |
121 | |
122 | /* the extent_tree has caches of all the extent mappings to disk */ |
123 | struct extent_map_tree extent_tree; |
124 | |
125 | /* the io_tree does range state (DIRTY, LOCKED etc) */ |
126 | struct extent_io_tree io_tree; |
127 | |
128 | /* |
129 | * Keep track of where the inode has extent items mapped in order to |
130 | * make sure the i_size adjustments are accurate. Not required when the |
131 | * filesystem is NO_HOLES, the status can't be set while mounted as |
132 | * it's a mkfs-time feature. |
133 | */ |
134 | struct extent_io_tree *file_extent_tree; |
135 | |
136 | /* held while logging the inode in tree-log.c */ |
137 | struct mutex log_mutex; |
138 | |
139 | /* |
140 | * Counters to keep track of the number of extent item's we may use due |
141 | * to delalloc and such. outstanding_extents is the number of extent |
142 | * items we think we'll end up using, and reserved_extents is the number |
143 | * of extent items we've reserved metadata for. Protected by 'lock'. |
144 | */ |
145 | unsigned outstanding_extents; |
146 | |
147 | /* used to order data wrt metadata */ |
148 | spinlock_t ordered_tree_lock; |
149 | struct rb_root ordered_tree; |
150 | struct rb_node *ordered_tree_last; |
151 | |
152 | /* list of all the delalloc inodes in the FS. There are times we need |
153 | * to write all the delalloc pages to disk, and this list is used |
154 | * to walk them all. |
155 | */ |
156 | struct list_head delalloc_inodes; |
157 | |
158 | /* node for the red-black tree that links inodes in subvolume root */ |
159 | struct rb_node rb_node; |
160 | |
161 | unsigned long runtime_flags; |
162 | |
163 | /* full 64 bit generation number, struct vfs_inode doesn't have a big |
164 | * enough field for this. |
165 | */ |
166 | u64 generation; |
167 | |
168 | /* |
169 | * ID of the transaction handle that last modified this inode. |
170 | * Protected by 'lock'. |
171 | */ |
172 | u64 last_trans; |
173 | |
174 | /* |
175 | * ID of the transaction that last logged this inode. |
176 | * Protected by 'lock'. |
177 | */ |
178 | u64 logged_trans; |
179 | |
180 | /* |
181 | * Log transaction ID when this inode was last modified. |
182 | * Protected by 'lock'. |
183 | */ |
184 | int last_sub_trans; |
185 | |
186 | /* A local copy of root's last_log_commit. Protected by 'lock'. */ |
187 | int last_log_commit; |
188 | |
189 | union { |
190 | /* |
191 | * Total number of bytes pending delalloc, used by stat to |
192 | * calculate the real block usage of the file. This is used |
193 | * only for files. Protected by 'lock'. |
194 | */ |
195 | u64 delalloc_bytes; |
196 | /* |
197 | * The lowest possible index of the next dir index key which |
198 | * points to an inode that needs to be logged. |
199 | * This is used only for directories. |
200 | * Use the helpers btrfs_get_first_dir_index_to_log() and |
201 | * btrfs_set_first_dir_index_to_log() to access this field. |
202 | */ |
203 | u64 first_dir_index_to_log; |
204 | }; |
205 | |
206 | union { |
207 | /* |
208 | * Total number of bytes pending delalloc that fall within a file |
209 | * range that is either a hole or beyond EOF (and no prealloc extent |
210 | * exists in the range). This is always <= delalloc_bytes and this |
211 | * is used only for files. Protected by 'lock'. |
212 | */ |
213 | u64 new_delalloc_bytes; |
214 | /* |
215 | * The offset of the last dir index key that was logged. |
216 | * This is used only for directories. |
217 | */ |
218 | u64 last_dir_index_offset; |
219 | }; |
220 | |
221 | /* |
222 | * Total number of bytes pending defrag, used by stat to check whether |
223 | * it needs COW. Protected by 'lock'. |
224 | */ |
225 | u64 defrag_bytes; |
226 | |
227 | /* |
228 | * The size of the file stored in the metadata on disk. data=ordered |
229 | * means the in-memory i_size might be larger than the size on disk |
230 | * because not all the blocks are written yet. Protected by 'lock'. |
231 | */ |
232 | u64 disk_i_size; |
233 | |
234 | /* |
235 | * If this is a directory then index_cnt is the counter for the index |
236 | * number for new files that are created. For an empty directory, this |
237 | * must be initialized to BTRFS_DIR_START_INDEX. |
238 | */ |
239 | u64 index_cnt; |
240 | |
241 | /* Cache the directory index number to speed the dir/file remove */ |
242 | u64 dir_index; |
243 | |
244 | /* the fsync log has some corner cases that mean we have to check |
245 | * directories to see if any unlinks have been done before |
246 | * the directory was logged. See tree-log.c for all the |
247 | * details |
248 | */ |
249 | u64 last_unlink_trans; |
250 | |
251 | /* |
252 | * The id/generation of the last transaction where this inode was |
253 | * either the source or the destination of a clone/dedupe operation. |
254 | * Used when logging an inode to know if there are shared extents that |
255 | * need special care when logging checksum items, to avoid duplicate |
256 | * checksum items in a log (which can lead to a corruption where we end |
257 | * up with missing checksum ranges after log replay). |
258 | * Protected by the vfs inode lock. |
259 | */ |
260 | u64 last_reflink_trans; |
261 | |
262 | /* |
263 | * Number of bytes outstanding that are going to need csums. This is |
264 | * used in ENOSPC accounting. Protected by 'lock'. |
265 | */ |
266 | u64 csum_bytes; |
267 | |
268 | /* Backwards incompatible flags, lower half of inode_item::flags */ |
269 | u32 flags; |
270 | /* Read-only compatibility flags, upper half of inode_item::flags */ |
271 | u32 ro_flags; |
272 | |
273 | struct btrfs_block_rsv block_rsv; |
274 | |
275 | struct btrfs_delayed_node *delayed_node; |
276 | |
277 | /* File creation time. */ |
278 | u64 i_otime_sec; |
279 | u32 i_otime_nsec; |
280 | |
281 | /* Hook into fs_info->delayed_iputs */ |
282 | struct list_head delayed_iput; |
283 | |
284 | struct rw_semaphore i_mmap_lock; |
285 | struct inode vfs_inode; |
286 | }; |
287 | |
288 | static inline u64 btrfs_get_first_dir_index_to_log(const struct btrfs_inode *inode) |
289 | { |
290 | return READ_ONCE(inode->first_dir_index_to_log); |
291 | } |
292 | |
293 | static inline void btrfs_set_first_dir_index_to_log(struct btrfs_inode *inode, |
294 | u64 index) |
295 | { |
296 | WRITE_ONCE(inode->first_dir_index_to_log, index); |
297 | } |
298 | |
299 | static inline struct btrfs_inode *BTRFS_I(const struct inode *inode) |
300 | { |
301 | return container_of(inode, struct btrfs_inode, vfs_inode); |
302 | } |
303 | |
304 | static inline unsigned long btrfs_inode_hash(u64 objectid, |
305 | const struct btrfs_root *root) |
306 | { |
307 | u64 h = objectid ^ (root->root_key.objectid * GOLDEN_RATIO_PRIME); |
308 | |
309 | #if BITS_PER_LONG == 32 |
310 | h = (h >> 32) ^ (h & 0xffffffff); |
311 | #endif |
312 | |
313 | return (unsigned long)h; |
314 | } |
315 | |
316 | #if BITS_PER_LONG == 32 |
317 | |
318 | /* |
319 | * On 32 bit systems the i_ino of struct inode is 32 bits (unsigned long), so |
320 | * we use the inode's location objectid which is a u64 to avoid truncation. |
321 | */ |
322 | static inline u64 btrfs_ino(const struct btrfs_inode *inode) |
323 | { |
324 | u64 ino = inode->location.objectid; |
325 | |
326 | /* type == BTRFS_ROOT_ITEM_KEY: subvol dir */ |
327 | if (inode->location.type == BTRFS_ROOT_ITEM_KEY) |
328 | ino = inode->vfs_inode.i_ino; |
329 | return ino; |
330 | } |
331 | |
332 | #else |
333 | |
334 | static inline u64 btrfs_ino(const struct btrfs_inode *inode) |
335 | { |
336 | return inode->vfs_inode.i_ino; |
337 | } |
338 | |
339 | #endif |
340 | |
341 | static inline void btrfs_i_size_write(struct btrfs_inode *inode, u64 size) |
342 | { |
343 | i_size_write(inode: &inode->vfs_inode, i_size: size); |
344 | inode->disk_i_size = size; |
345 | } |
346 | |
347 | static inline bool btrfs_is_free_space_inode(struct btrfs_inode *inode) |
348 | { |
349 | return test_bit(BTRFS_INODE_FREE_SPACE_INODE, &inode->runtime_flags); |
350 | } |
351 | |
352 | static inline bool is_data_inode(struct inode *inode) |
353 | { |
354 | return btrfs_ino(inode: BTRFS_I(inode)) != BTRFS_BTREE_INODE_OBJECTID; |
355 | } |
356 | |
357 | static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode, |
358 | int mod) |
359 | { |
360 | lockdep_assert_held(&inode->lock); |
361 | inode->outstanding_extents += mod; |
362 | if (btrfs_is_free_space_inode(inode)) |
363 | return; |
364 | trace_btrfs_inode_mod_outstanding_extents(root: inode->root, ino: btrfs_ino(inode), |
365 | mod, outstanding: inode->outstanding_extents); |
366 | } |
367 | |
368 | /* |
369 | * Called every time after doing a buffered, direct IO or memory mapped write. |
370 | * |
371 | * This is to ensure that if we write to a file that was previously fsynced in |
372 | * the current transaction, then try to fsync it again in the same transaction, |
373 | * we will know that there were changes in the file and that it needs to be |
374 | * logged. |
375 | */ |
376 | static inline void btrfs_set_inode_last_sub_trans(struct btrfs_inode *inode) |
377 | { |
378 | spin_lock(lock: &inode->lock); |
379 | inode->last_sub_trans = inode->root->log_transid; |
380 | spin_unlock(lock: &inode->lock); |
381 | } |
382 | |
383 | /* |
384 | * Should be called while holding the inode's VFS lock in exclusive mode or in a |
385 | * context where no one else can access the inode concurrently (during inode |
386 | * creation or when loading an inode from disk). |
387 | */ |
388 | static inline void btrfs_set_inode_full_sync(struct btrfs_inode *inode) |
389 | { |
390 | set_bit(nr: BTRFS_INODE_NEEDS_FULL_SYNC, addr: &inode->runtime_flags); |
391 | /* |
392 | * The inode may have been part of a reflink operation in the last |
393 | * transaction that modified it, and then a fsync has reset the |
394 | * last_reflink_trans to avoid subsequent fsyncs in the same |
395 | * transaction to do unnecessary work. So update last_reflink_trans |
396 | * to the last_trans value (we have to be pessimistic and assume a |
397 | * reflink happened). |
398 | * |
399 | * The ->last_trans is protected by the inode's spinlock and we can |
400 | * have a concurrent ordered extent completion update it. Also set |
401 | * last_reflink_trans to ->last_trans only if the former is less than |
402 | * the later, because we can be called in a context where |
403 | * last_reflink_trans was set to the current transaction generation |
404 | * while ->last_trans was not yet updated in the current transaction, |
405 | * and therefore has a lower value. |
406 | */ |
407 | spin_lock(lock: &inode->lock); |
408 | if (inode->last_reflink_trans < inode->last_trans) |
409 | inode->last_reflink_trans = inode->last_trans; |
410 | spin_unlock(lock: &inode->lock); |
411 | } |
412 | |
413 | static inline bool btrfs_inode_in_log(struct btrfs_inode *inode, u64 generation) |
414 | { |
415 | bool ret = false; |
416 | |
417 | spin_lock(lock: &inode->lock); |
418 | if (inode->logged_trans == generation && |
419 | inode->last_sub_trans <= inode->last_log_commit && |
420 | inode->last_sub_trans <= btrfs_get_root_last_log_commit(root: inode->root)) |
421 | ret = true; |
422 | spin_unlock(lock: &inode->lock); |
423 | return ret; |
424 | } |
425 | |
426 | /* |
427 | * Check if the inode has flags compatible with compression |
428 | */ |
429 | static inline bool btrfs_inode_can_compress(const struct btrfs_inode *inode) |
430 | { |
431 | if (inode->flags & BTRFS_INODE_NODATACOW || |
432 | inode->flags & BTRFS_INODE_NODATASUM) |
433 | return false; |
434 | return true; |
435 | } |
436 | |
437 | /* Array of bytes with variable length, hexadecimal format 0x1234 */ |
438 | #define CSUM_FMT "0x%*phN" |
439 | #define CSUM_FMT_VALUE(size, bytes) size, bytes |
440 | |
441 | int btrfs_check_sector_csum(struct btrfs_fs_info *fs_info, struct page *page, |
442 | u32 pgoff, u8 *csum, const u8 * const csum_expected); |
443 | bool btrfs_data_csum_ok(struct btrfs_bio *bbio, struct btrfs_device *dev, |
444 | u32 bio_offset, struct bio_vec *bv); |
445 | noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, |
446 | u64 *orig_start, u64 *orig_block_len, |
447 | u64 *ram_bytes, bool nowait, bool strict); |
448 | |
449 | void btrfs_del_delalloc_inode(struct btrfs_inode *inode); |
450 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); |
451 | int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index); |
452 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
453 | struct btrfs_inode *dir, struct btrfs_inode *inode, |
454 | const struct fscrypt_str *name); |
455 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
456 | struct btrfs_inode *parent_inode, struct btrfs_inode *inode, |
457 | const struct fscrypt_str *name, int add_backref, u64 index); |
458 | int btrfs_delete_subvolume(struct btrfs_inode *dir, struct dentry *dentry); |
459 | int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len, |
460 | int front); |
461 | |
462 | int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context); |
463 | int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, |
464 | bool in_reclaim_context); |
465 | int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end, |
466 | unsigned int , |
467 | struct extent_state **cached_state); |
468 | |
469 | struct btrfs_new_inode_args { |
470 | /* Input */ |
471 | struct inode *dir; |
472 | struct dentry *dentry; |
473 | struct inode *inode; |
474 | bool orphan; |
475 | bool subvol; |
476 | |
477 | /* Output from btrfs_new_inode_prepare(), input to btrfs_create_new_inode(). */ |
478 | struct posix_acl *default_acl; |
479 | struct posix_acl *acl; |
480 | struct fscrypt_name fname; |
481 | }; |
482 | |
483 | int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args, |
484 | unsigned int *trans_num_items); |
485 | int btrfs_create_new_inode(struct btrfs_trans_handle *trans, |
486 | struct btrfs_new_inode_args *args); |
487 | void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args); |
488 | struct inode *btrfs_new_subvol_inode(struct mnt_idmap *idmap, |
489 | struct inode *dir); |
490 | void btrfs_set_delalloc_extent(struct btrfs_inode *inode, struct extent_state *state, |
491 | u32 bits); |
492 | void btrfs_clear_delalloc_extent(struct btrfs_inode *inode, |
493 | struct extent_state *state, u32 bits); |
494 | void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new, |
495 | struct extent_state *other); |
496 | void btrfs_split_delalloc_extent(struct btrfs_inode *inode, |
497 | struct extent_state *orig, u64 split); |
498 | void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end); |
499 | vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf); |
500 | void btrfs_evict_inode(struct inode *inode); |
501 | struct inode *btrfs_alloc_inode(struct super_block *sb); |
502 | void btrfs_destroy_inode(struct inode *inode); |
503 | void btrfs_free_inode(struct inode *inode); |
504 | int btrfs_drop_inode(struct inode *inode); |
505 | int __init btrfs_init_cachep(void); |
506 | void __cold btrfs_destroy_cachep(void); |
507 | struct inode *btrfs_iget_path(struct super_block *s, u64 ino, |
508 | struct btrfs_root *root, struct btrfs_path *path); |
509 | struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root); |
510 | struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, |
511 | struct page *page, u64 start, u64 len); |
512 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
513 | struct btrfs_inode *inode); |
514 | int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
515 | struct btrfs_inode *inode); |
516 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct btrfs_inode *inode); |
517 | int btrfs_orphan_cleanup(struct btrfs_root *root); |
518 | int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size); |
519 | void btrfs_add_delayed_iput(struct btrfs_inode *inode); |
520 | void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info); |
521 | int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info); |
522 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
523 | u64 start, u64 num_bytes, u64 min_size, |
524 | loff_t actual_len, u64 *alloc_hint); |
525 | int btrfs_prealloc_file_range_trans(struct inode *inode, |
526 | struct btrfs_trans_handle *trans, int mode, |
527 | u64 start, u64 num_bytes, u64 min_size, |
528 | loff_t actual_len, u64 *alloc_hint); |
529 | int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page, |
530 | u64 start, u64 end, struct writeback_control *wbc); |
531 | int btrfs_writepage_cow_fixup(struct page *page); |
532 | int btrfs_encoded_io_compression_from_extent(struct btrfs_fs_info *fs_info, |
533 | int compress_type); |
534 | int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode, |
535 | u64 file_offset, u64 disk_bytenr, |
536 | u64 disk_io_size, |
537 | struct page **pages); |
538 | ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter, |
539 | struct btrfs_ioctl_encoded_io_args *encoded); |
540 | ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from, |
541 | const struct btrfs_ioctl_encoded_io_args *encoded); |
542 | |
543 | ssize_t btrfs_dio_read(struct kiocb *iocb, struct iov_iter *iter, |
544 | size_t done_before); |
545 | struct iomap_dio *btrfs_dio_write(struct kiocb *iocb, struct iov_iter *iter, |
546 | size_t done_before); |
547 | |
548 | extern const struct dentry_operations btrfs_dentry_operations; |
549 | |
550 | /* Inode locking type flags, by default the exclusive lock is taken. */ |
551 | enum btrfs_ilock_type { |
552 | ENUM_BIT(BTRFS_ILOCK_SHARED), |
553 | ENUM_BIT(BTRFS_ILOCK_TRY), |
554 | ENUM_BIT(BTRFS_ILOCK_MMAP), |
555 | }; |
556 | |
557 | int btrfs_inode_lock(struct btrfs_inode *inode, unsigned int ilock_flags); |
558 | void btrfs_inode_unlock(struct btrfs_inode *inode, unsigned int ilock_flags); |
559 | void btrfs_update_inode_bytes(struct btrfs_inode *inode, const u64 add_bytes, |
560 | const u64 del_bytes); |
561 | void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end); |
562 | |
563 | #endif |
564 | |