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 "extent_map.h"
23 #include "extent_io.h"
24 #include "extent-io-tree.h"
25 #include "ordered-data.h"
26 #include "delayed-inode.h"
27
28 struct extent_state;
29 struct posix_acl;
30 struct iov_iter;
31 struct writeback_control;
32 struct btrfs_root;
33 struct btrfs_fs_info;
34 struct btrfs_trans_handle;
35
36 /*
37 * Since we search a directory based on f_pos (struct dir_context::pos) we have
38 * to start at 2 since '.' and '..' have f_pos of 0 and 1 respectively, so
39 * everybody else has to start at 2 (see btrfs_real_readdir() and dir_emit_dots()).
40 */
41 #define BTRFS_DIR_START_INDEX 2
42
43 /*
44 * ordered_data_close is set by truncate when a file that used
45 * to have good data has been truncated to zero. When it is set
46 * the btrfs file release call will add this inode to the
47 * ordered operations list so that we make sure to flush out any
48 * new data the application may have written before commit.
49 */
50 enum {
51 BTRFS_INODE_FLUSH_ON_CLOSE,
52 BTRFS_INODE_DUMMY,
53 BTRFS_INODE_IN_DEFRAG,
54 BTRFS_INODE_HAS_ASYNC_EXTENT,
55 /*
56 * Always set under the VFS' inode lock, otherwise it can cause races
57 * during fsync (we start as a fast fsync and then end up in a full
58 * fsync racing with ordered extent completion).
59 */
60 BTRFS_INODE_NEEDS_FULL_SYNC,
61 BTRFS_INODE_COPY_EVERYTHING,
62 BTRFS_INODE_HAS_PROPS,
63 BTRFS_INODE_SNAPSHOT_FLUSH,
64 /*
65 * Set and used when logging an inode and it serves to signal that an
66 * inode does not have xattrs, so subsequent fsyncs can avoid searching
67 * for xattrs to log. This bit must be cleared whenever a xattr is added
68 * to an inode.
69 */
70 BTRFS_INODE_NO_XATTRS,
71 /*
72 * Set when we are in a context where we need to start a transaction and
73 * have dirty pages with the respective file range locked. This is to
74 * ensure that when reserving space for the transaction, if we are low
75 * on available space and need to flush delalloc, we will not flush
76 * delalloc for this inode, because that could result in a deadlock (on
77 * the file range, inode's io_tree).
78 */
79 BTRFS_INODE_NO_DELALLOC_FLUSH,
80 /*
81 * Set when we are working on enabling verity for a file. Computing and
82 * writing the whole Merkle tree can take a while so we want to prevent
83 * races where two separate tasks attempt to simultaneously start verity
84 * on the same file.
85 */
86 BTRFS_INODE_VERITY_IN_PROGRESS,
87 /* Set when this inode is a free space inode. */
88 BTRFS_INODE_FREE_SPACE_INODE,
89 /* Set when there are no capabilities in XATTs for the inode. */
90 BTRFS_INODE_NO_CAP_XATTR,
91 /*
92 * Set if an error happened when doing a COW write before submitting a
93 * bio or during writeback. Used for both buffered writes and direct IO
94 * writes. This is to signal a fast fsync that it has to wait for
95 * ordered extents to complete and therefore not log extent maps that
96 * point to unwritten extents (when an ordered extent completes and it
97 * has the BTRFS_ORDERED_IOERR flag set, it drops extent maps in its
98 * range).
99 */
100 BTRFS_INODE_COW_WRITE_ERROR,
101 /*
102 * Indicate this is a directory that points to a subvolume for which
103 * there is no root reference item. That's a case like the following:
104 *
105 * $ btrfs subvolume create /mnt/parent
106 * $ btrfs subvolume create /mnt/parent/child
107 * $ btrfs subvolume snapshot /mnt/parent /mnt/snap
108 *
109 * If subvolume "parent" is root 256, subvolume "child" is root 257 and
110 * snapshot "snap" is root 258, then there's no root reference item (key
111 * BTRFS_ROOT_REF_KEY in the root tree) for the subvolume "child"
112 * associated to root 258 (the snapshot) - there's only for the root
113 * of the "parent" subvolume (root 256). In the chunk root we have a
114 * (256 BTRFS_ROOT_REF_KEY 257) key but we don't have a
115 * (258 BTRFS_ROOT_REF_KEY 257) key - the sames goes for backrefs, we
116 * have a (257 BTRFS_ROOT_BACKREF_KEY 256) but we don't have a
117 * (257 BTRFS_ROOT_BACKREF_KEY 258) key.
118 *
119 * So when opening the "child" dentry from the snapshot's directory,
120 * we don't find a root ref item and we create a stub inode. This is
121 * done at new_simple_dir(), called from btrfs_lookup_dentry().
122 */
123 BTRFS_INODE_ROOT_STUB,
124 };
125
126 /* in memory btrfs inode */
127 struct btrfs_inode {
128 /* which subvolume this inode belongs to */
129 struct btrfs_root *root;
130
131 #if BITS_PER_LONG == 32
132 /*
133 * The objectid of the corresponding BTRFS_INODE_ITEM_KEY.
134 * On 64 bits platforms we can get it from vfs_inode.i_ino, which is an
135 * unsigned long and therefore 64 bits on such platforms.
136 */
137 u64 objectid;
138 #endif
139
140 /* Cached value of inode property 'compression'. */
141 u8 prop_compress;
142
143 /*
144 * Force compression on the file using the defrag ioctl, could be
145 * different from prop_compress and takes precedence if set.
146 */
147 u8 defrag_compress;
148
149 /*
150 * Lock for counters and all fields used to determine if the inode is in
151 * the log or not (last_trans, last_sub_trans, last_log_commit,
152 * logged_trans), to access/update delalloc_bytes, new_delalloc_bytes,
153 * defrag_bytes, disk_i_size, outstanding_extents, csum_bytes and to
154 * update the VFS' inode number of bytes used.
155 * Also protects setting struct file::private_data.
156 */
157 spinlock_t lock;
158
159 /* the extent_tree has caches of all the extent mappings to disk */
160 struct extent_map_tree extent_tree;
161
162 /* the io_tree does range state (DIRTY, LOCKED etc) */
163 struct extent_io_tree io_tree;
164
165 /*
166 * Keep track of where the inode has extent items mapped in order to
167 * make sure the i_size adjustments are accurate. Not required when the
168 * filesystem is NO_HOLES, the status can't be set while mounted as
169 * it's a mkfs-time feature.
170 */
171 struct extent_io_tree *file_extent_tree;
172
173 /* held while logging the inode in tree-log.c */
174 struct mutex log_mutex;
175
176 /*
177 * Counters to keep track of the number of extent item's we may use due
178 * to delalloc and such. outstanding_extents is the number of extent
179 * items we think we'll end up using, and reserved_extents is the number
180 * of extent items we've reserved metadata for. Protected by 'lock'.
181 */
182 unsigned outstanding_extents;
183
184 /* used to order data wrt metadata */
185 spinlock_t ordered_tree_lock;
186 struct rb_root ordered_tree;
187 struct rb_node *ordered_tree_last;
188
189 /* list of all the delalloc inodes in the FS. There are times we need
190 * to write all the delalloc pages to disk, and this list is used
191 * to walk them all.
192 */
193 struct list_head delalloc_inodes;
194
195 unsigned long runtime_flags;
196
197 /* full 64 bit generation number, struct vfs_inode doesn't have a big
198 * enough field for this.
199 */
200 u64 generation;
201
202 /*
203 * ID of the transaction handle that last modified this inode.
204 * Protected by 'lock'.
205 */
206 u64 last_trans;
207
208 /*
209 * ID of the transaction that last logged this inode.
210 * Protected by 'lock'.
211 */
212 u64 logged_trans;
213
214 /*
215 * Log transaction ID when this inode was last modified.
216 * Protected by 'lock'.
217 */
218 int last_sub_trans;
219
220 /* A local copy of root's last_log_commit. Protected by 'lock'. */
221 int last_log_commit;
222
223 union {
224 /*
225 * Total number of bytes pending delalloc, used by stat to
226 * calculate the real block usage of the file. This is used
227 * only for files. Protected by 'lock'.
228 */
229 u64 delalloc_bytes;
230 /*
231 * The lowest possible index of the next dir index key which
232 * points to an inode that needs to be logged.
233 * This is used only for directories.
234 * Use the helpers btrfs_get_first_dir_index_to_log() and
235 * btrfs_set_first_dir_index_to_log() to access this field.
236 */
237 u64 first_dir_index_to_log;
238 };
239
240 union {
241 /*
242 * Total number of bytes pending delalloc that fall within a file
243 * range that is either a hole or beyond EOF (and no prealloc extent
244 * exists in the range). This is always <= delalloc_bytes and this
245 * is used only for files. Protected by 'lock'.
246 */
247 u64 new_delalloc_bytes;
248 /*
249 * The offset of the last dir index key that was logged.
250 * This is used only for directories.
251 */
252 u64 last_dir_index_offset;
253 };
254
255 union {
256 /*
257 * Total number of bytes pending defrag, used by stat to check whether
258 * it needs COW. Protected by 'lock'.
259 * Used by inodes other than the data relocation inode.
260 */
261 u64 defrag_bytes;
262
263 /*
264 * Logical address of the block group being relocated.
265 * Used only by the data relocation inode.
266 */
267 u64 reloc_block_group_start;
268 };
269
270 /*
271 * The size of the file stored in the metadata on disk. data=ordered
272 * means the in-memory i_size might be larger than the size on disk
273 * because not all the blocks are written yet. Protected by 'lock'.
274 */
275 u64 disk_i_size;
276
277 union {
278 /*
279 * If this is a directory then index_cnt is the counter for the
280 * index number for new files that are created. For an empty
281 * directory, this must be initialized to BTRFS_DIR_START_INDEX.
282 */
283 u64 index_cnt;
284
285 /*
286 * If this is not a directory, this is the number of bytes
287 * outstanding that are going to need csums. This is used in
288 * ENOSPC accounting. Protected by 'lock'.
289 */
290 u64 csum_bytes;
291 };
292
293 /* Cache the directory index number to speed the dir/file remove */
294 u64 dir_index;
295
296 /* the fsync log has some corner cases that mean we have to check
297 * directories to see if any unlinks have been done before
298 * the directory was logged. See tree-log.c for all the
299 * details
300 */
301 u64 last_unlink_trans;
302
303 union {
304 /*
305 * The id/generation of the last transaction where this inode
306 * was either the source or the destination of a clone/dedupe
307 * operation. Used when logging an inode to know if there are
308 * shared extents that need special care when logging checksum
309 * items, to avoid duplicate checksum items in a log (which can
310 * lead to a corruption where we end up with missing checksum
311 * ranges after log replay). Protected by the VFS inode lock.
312 * Used for regular files only.
313 */
314 u64 last_reflink_trans;
315
316 /*
317 * In case this a root stub inode (BTRFS_INODE_ROOT_STUB flag set),
318 * the ID of that root.
319 */
320 u64 ref_root_id;
321 };
322
323 /* Backwards incompatible flags, lower half of inode_item::flags */
324 u32 flags;
325 /* Read-only compatibility flags, upper half of inode_item::flags */
326 u32 ro_flags;
327
328 struct btrfs_block_rsv block_rsv;
329
330 struct btrfs_delayed_node *delayed_node;
331
332 /* File creation time. */
333 u64 i_otime_sec;
334 u32 i_otime_nsec;
335
336 /* Hook into fs_info->delayed_iputs */
337 struct list_head delayed_iput;
338
339 struct rw_semaphore i_mmap_lock;
340 struct inode vfs_inode;
341 };
342
343 static inline u64 btrfs_get_first_dir_index_to_log(const struct btrfs_inode *inode)
344 {
345 return READ_ONCE(inode->first_dir_index_to_log);
346 }
347
348 static inline void btrfs_set_first_dir_index_to_log(struct btrfs_inode *inode,
349 u64 index)
350 {
351 WRITE_ONCE(inode->first_dir_index_to_log, index);
352 }
353
354 static inline struct btrfs_inode *BTRFS_I(const struct inode *inode)
355 {
356 return container_of(inode, struct btrfs_inode, vfs_inode);
357 }
358
359 static inline unsigned long btrfs_inode_hash(u64 objectid,
360 const struct btrfs_root *root)
361 {
362 u64 h = objectid ^ (root->root_key.objectid * GOLDEN_RATIO_PRIME);
363
364 #if BITS_PER_LONG == 32
365 h = (h >> 32) ^ (h & 0xffffffff);
366 #endif
367
368 return (unsigned long)h;
369 }
370
371 #if BITS_PER_LONG == 32
372
373 /*
374 * On 32 bit systems the i_ino of struct inode is 32 bits (unsigned long), so
375 * we use the inode's location objectid which is a u64 to avoid truncation.
376 */
377 static inline u64 btrfs_ino(const struct btrfs_inode *inode)
378 {
379 u64 ino = inode->objectid;
380
381 if (test_bit(BTRFS_INODE_ROOT_STUB, &inode->runtime_flags))
382 ino = inode->vfs_inode.i_ino;
383 return ino;
384 }
385
386 #else
387
388 static inline u64 btrfs_ino(const struct btrfs_inode *inode)
389 {
390 return inode->vfs_inode.i_ino;
391 }
392
393 #endif
394
395 static inline void btrfs_get_inode_key(const struct btrfs_inode *inode,
396 struct btrfs_key *key)
397 {
398 key->objectid = btrfs_ino(inode);
399 key->type = BTRFS_INODE_ITEM_KEY;
400 key->offset = 0;
401 }
402
403 static inline void btrfs_set_inode_number(struct btrfs_inode *inode, u64 ino)
404 {
405 #if BITS_PER_LONG == 32
406 inode->objectid = ino;
407 #endif
408 inode->vfs_inode.i_ino = ino;
409 }
410
411 static inline void btrfs_i_size_write(struct btrfs_inode *inode, u64 size)
412 {
413 i_size_write(&inode->vfs_inode, size);
414 inode->disk_i_size = size;
415 }
416
417 static inline bool btrfs_is_free_space_inode(const struct btrfs_inode *inode)
418 {
419 return test_bit(BTRFS_INODE_FREE_SPACE_INODE, &inode->runtime_flags);
420 }
421
422 static inline bool is_data_inode(const struct btrfs_inode *inode)
423 {
424 return btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID;
425 }
426
427 static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode,
428 int mod)
429 {
430 lockdep_assert_held(&inode->lock);
431 inode->outstanding_extents += mod;
432 if (btrfs_is_free_space_inode(inode))
433 return;
434 trace_btrfs_inode_mod_outstanding_extents(inode->root, btrfs_ino(inode),
435 mod, inode->outstanding_extents);
436 }
437
438 /*
439 * Called every time after doing a buffered, direct IO or memory mapped write.
440 *
441 * This is to ensure that if we write to a file that was previously fsynced in
442 * the current transaction, then try to fsync it again in the same transaction,
443 * we will know that there were changes in the file and that it needs to be
444 * logged.
445 */
446 static inline void btrfs_set_inode_last_sub_trans(struct btrfs_inode *inode)
447 {
448 spin_lock(&inode->lock);
449 inode->last_sub_trans = inode->root->log_transid;
450 spin_unlock(&inode->lock);
451 }
452
453 /*
454 * Should be called while holding the inode's VFS lock in exclusive mode, or
455 * while holding the inode's mmap lock (struct btrfs_inode::i_mmap_lock) in
456 * either shared or exclusive mode, or in a context where no one else can access
457 * the inode concurrently (during inode creation or when loading an inode from
458 * disk).
459 */
460 static inline void btrfs_set_inode_full_sync(struct btrfs_inode *inode)
461 {
462 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
463 /*
464 * The inode may have been part of a reflink operation in the last
465 * transaction that modified it, and then a fsync has reset the
466 * last_reflink_trans to avoid subsequent fsyncs in the same
467 * transaction to do unnecessary work. So update last_reflink_trans
468 * to the last_trans value (we have to be pessimistic and assume a
469 * reflink happened).
470 *
471 * The ->last_trans is protected by the inode's spinlock and we can
472 * have a concurrent ordered extent completion update it. Also set
473 * last_reflink_trans to ->last_trans only if the former is less than
474 * the later, because we can be called in a context where
475 * last_reflink_trans was set to the current transaction generation
476 * while ->last_trans was not yet updated in the current transaction,
477 * and therefore has a lower value.
478 */
479 spin_lock(&inode->lock);
480 if (inode->last_reflink_trans < inode->last_trans)
481 inode->last_reflink_trans = inode->last_trans;
482 spin_unlock(&inode->lock);
483 }
484
485 static inline bool btrfs_inode_in_log(struct btrfs_inode *inode, u64 generation)
486 {
487 bool ret = false;
488
489 spin_lock(&inode->lock);
490 if (inode->logged_trans == generation &&
491 inode->last_sub_trans <= inode->last_log_commit &&
492 inode->last_sub_trans <= btrfs_get_root_last_log_commit(inode->root))
493 ret = true;
494 spin_unlock(&inode->lock);
495 return ret;
496 }
497
498 /*
499 * Check if the inode has flags compatible with compression
500 */
501 static inline bool btrfs_inode_can_compress(const struct btrfs_inode *inode)
502 {
503 if (inode->flags & BTRFS_INODE_NODATACOW ||
504 inode->flags & BTRFS_INODE_NODATASUM)
505 return false;
506 return true;
507 }
508
509 /* Array of bytes with variable length, hexadecimal format 0x1234 */
510 #define CSUM_FMT "0x%*phN"
511 #define CSUM_FMT_VALUE(size, bytes) size, bytes
512
513 int btrfs_check_sector_csum(struct btrfs_fs_info *fs_info, struct page *page,
514 u32 pgoff, u8 *csum, const u8 * const csum_expected);
515 bool btrfs_data_csum_ok(struct btrfs_bio *bbio, struct btrfs_device *dev,
516 u32 bio_offset, struct bio_vec *bv);
517 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
518 struct btrfs_file_extent *file_extent,
519 bool nowait, bool strict);
520
521 void btrfs_del_delalloc_inode(struct btrfs_inode *inode);
522 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
523 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
524 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
525 struct btrfs_inode *dir, struct btrfs_inode *inode,
526 const struct fscrypt_str *name);
527 int btrfs_add_link(struct btrfs_trans_handle *trans,
528 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
529 const struct fscrypt_str *name, int add_backref, u64 index);
530 int btrfs_delete_subvolume(struct btrfs_inode *dir, struct dentry *dentry);
531 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
532 int front);
533
534 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
535 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
536 bool in_reclaim_context);
537 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
538 unsigned int extra_bits,
539 struct extent_state **cached_state);
540
541 struct btrfs_new_inode_args {
542 /* Input */
543 struct inode *dir;
544 struct dentry *dentry;
545 struct inode *inode;
546 bool orphan;
547 bool subvol;
548
549 /* Output from btrfs_new_inode_prepare(), input to btrfs_create_new_inode(). */
550 struct posix_acl *default_acl;
551 struct posix_acl *acl;
552 struct fscrypt_name fname;
553 };
554
555 int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args,
556 unsigned int *trans_num_items);
557 int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
558 struct btrfs_new_inode_args *args);
559 void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args);
560 struct inode *btrfs_new_subvol_inode(struct mnt_idmap *idmap,
561 struct inode *dir);
562 void btrfs_set_delalloc_extent(struct btrfs_inode *inode, struct extent_state *state,
563 u32 bits);
564 void btrfs_clear_delalloc_extent(struct btrfs_inode *inode,
565 struct extent_state *state, u32 bits);
566 void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new,
567 struct extent_state *other);
568 void btrfs_split_delalloc_extent(struct btrfs_inode *inode,
569 struct extent_state *orig, u64 split);
570 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
571 void btrfs_evict_inode(struct inode *inode);
572 struct inode *btrfs_alloc_inode(struct super_block *sb);
573 void btrfs_destroy_inode(struct inode *inode);
574 void btrfs_free_inode(struct inode *inode);
575 int btrfs_drop_inode(struct inode *inode);
576 int __init btrfs_init_cachep(void);
577 void __cold btrfs_destroy_cachep(void);
578 struct inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
579 struct btrfs_path *path);
580 struct inode *btrfs_iget(u64 ino, struct btrfs_root *root);
581 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
582 struct page *page, u64 start, u64 len);
583 int btrfs_update_inode(struct btrfs_trans_handle *trans,
584 struct btrfs_inode *inode);
585 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
586 struct btrfs_inode *inode);
587 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct btrfs_inode *inode);
588 int btrfs_orphan_cleanup(struct btrfs_root *root);
589 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
590 void btrfs_add_delayed_iput(struct btrfs_inode *inode);
591 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
592 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
593 int btrfs_prealloc_file_range(struct inode *inode, int mode,
594 u64 start, u64 num_bytes, u64 min_size,
595 loff_t actual_len, u64 *alloc_hint);
596 int btrfs_prealloc_file_range_trans(struct inode *inode,
597 struct btrfs_trans_handle *trans, int mode,
598 u64 start, u64 num_bytes, u64 min_size,
599 loff_t actual_len, u64 *alloc_hint);
600 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
601 u64 start, u64 end, struct writeback_control *wbc);
602 int btrfs_writepage_cow_fixup(struct page *page);
603 int btrfs_encoded_io_compression_from_extent(struct btrfs_fs_info *fs_info,
604 int compress_type);
605 int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
606 u64 file_offset, u64 disk_bytenr,
607 u64 disk_io_size,
608 struct page **pages);
609 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
610 struct btrfs_ioctl_encoded_io_args *encoded);
611 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
612 const struct btrfs_ioctl_encoded_io_args *encoded);
613
614 struct btrfs_inode *btrfs_find_first_inode(struct btrfs_root *root, u64 min_ino);
615
616 extern const struct dentry_operations btrfs_dentry_operations;
617
618 /* Inode locking type flags, by default the exclusive lock is taken. */
619 enum btrfs_ilock_type {
620 ENUM_BIT(BTRFS_ILOCK_SHARED),
621 ENUM_BIT(BTRFS_ILOCK_TRY),
622 ENUM_BIT(BTRFS_ILOCK_MMAP),
623 };
624
625 int btrfs_inode_lock(struct btrfs_inode *inode, unsigned int ilock_flags);
626 void btrfs_inode_unlock(struct btrfs_inode *inode, unsigned int ilock_flags);
627 void btrfs_update_inode_bytes(struct btrfs_inode *inode, const u64 add_bytes,
628 const u64 del_bytes);
629 void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end);
630 u64 btrfs_get_extent_allocation_hint(struct btrfs_inode *inode, u64 start,
631 u64 num_bytes);
632 struct extent_map *btrfs_create_io_em(struct btrfs_inode *inode, u64 start,
633 const struct btrfs_file_extent *file_extent,
634 int type);
635
636 #endif
637
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