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 */
156 spinlock_t lock;
157
158 /* the extent_tree has caches of all the extent mappings to disk */
159 struct extent_map_tree extent_tree;
160
161 /* the io_tree does range state (DIRTY, LOCKED etc) */
162 struct extent_io_tree io_tree;
163
164 /*
165 * Keep track of where the inode has extent items mapped in order to
166 * make sure the i_size adjustments are accurate. Not required when the
167 * filesystem is NO_HOLES, the status can't be set while mounted as
168 * it's a mkfs-time feature.
169 */
170 struct extent_io_tree *file_extent_tree;
171
172 /* held while logging the inode in tree-log.c */
173 struct mutex log_mutex;
174
175 /*
176 * Counters to keep track of the number of extent item's we may use due
177 * to delalloc and such. outstanding_extents is the number of extent
178 * items we think we'll end up using, and reserved_extents is the number
179 * of extent items we've reserved metadata for. Protected by 'lock'.
180 */
181 unsigned outstanding_extents;
182
183 /* used to order data wrt metadata */
184 spinlock_t ordered_tree_lock;
185 struct rb_root ordered_tree;
186 struct rb_node *ordered_tree_last;
187
188 /* list of all the delalloc inodes in the FS. There are times we need
189 * to write all the delalloc pages to disk, and this list is used
190 * to walk them all.
191 */
192 struct list_head delalloc_inodes;
193
194 unsigned long runtime_flags;
195
196 /* full 64 bit generation number, struct vfs_inode doesn't have a big
197 * enough field for this.
198 */
199 u64 generation;
200
201 /*
202 * ID of the transaction handle that last modified this inode.
203 * Protected by 'lock'.
204 */
205 u64 last_trans;
206
207 /*
208 * ID of the transaction that last logged this inode.
209 * Protected by 'lock'.
210 */
211 u64 logged_trans;
212
213 /*
214 * Log transaction ID when this inode was last modified.
215 * Protected by 'lock'.
216 */
217 int last_sub_trans;
218
219 /* A local copy of root's last_log_commit. Protected by 'lock'. */
220 int last_log_commit;
221
222 union {
223 /*
224 * Total number of bytes pending delalloc, used by stat to
225 * calculate the real block usage of the file. This is used
226 * only for files. Protected by 'lock'.
227 */
228 u64 delalloc_bytes;
229 /*
230 * The lowest possible index of the next dir index key which
231 * points to an inode that needs to be logged.
232 * This is used only for directories.
233 * Use the helpers btrfs_get_first_dir_index_to_log() and
234 * btrfs_set_first_dir_index_to_log() to access this field.
235 */
236 u64 first_dir_index_to_log;
237 };
238
239 union {
240 /*
241 * Total number of bytes pending delalloc that fall within a file
242 * range that is either a hole or beyond EOF (and no prealloc extent
243 * exists in the range). This is always <= delalloc_bytes and this
244 * is used only for files. Protected by 'lock'.
245 */
246 u64 new_delalloc_bytes;
247 /*
248 * The offset of the last dir index key that was logged.
249 * This is used only for directories.
250 */
251 u64 last_dir_index_offset;
252 };
253
254 union {
255 /*
256 * Total number of bytes pending defrag, used by stat to check whether
257 * it needs COW. Protected by 'lock'.
258 * Used by inodes other than the data relocation inode.
259 */
260 u64 defrag_bytes;
261
262 /*
263 * Logical address of the block group being relocated.
264 * Used only by the data relocation inode.
265 */
266 u64 reloc_block_group_start;
267 };
268
269 /*
270 * The size of the file stored in the metadata on disk. data=ordered
271 * means the in-memory i_size might be larger than the size on disk
272 * because not all the blocks are written yet. Protected by 'lock'.
273 */
274 u64 disk_i_size;
275
276 union {
277 /*
278 * If this is a directory then index_cnt is the counter for the
279 * index number for new files that are created. For an empty
280 * directory, this must be initialized to BTRFS_DIR_START_INDEX.
281 */
282 u64 index_cnt;
283
284 /*
285 * If this is not a directory, this is the number of bytes
286 * outstanding that are going to need csums. This is used in
287 * ENOSPC accounting. Protected by 'lock'.
288 */
289 u64 csum_bytes;
290 };
291
292 /* Cache the directory index number to speed the dir/file remove */
293 u64 dir_index;
294
295 /* the fsync log has some corner cases that mean we have to check
296 * directories to see if any unlinks have been done before
297 * the directory was logged. See tree-log.c for all the
298 * details
299 */
300 u64 last_unlink_trans;
301
302 union {
303 /*
304 * The id/generation of the last transaction where this inode
305 * was either the source or the destination of a clone/dedupe
306 * operation. Used when logging an inode to know if there are
307 * shared extents that need special care when logging checksum
308 * items, to avoid duplicate checksum items in a log (which can
309 * lead to a corruption where we end up with missing checksum
310 * ranges after log replay). Protected by the VFS inode lock.
311 * Used for regular files only.
312 */
313 u64 last_reflink_trans;
314
315 /*
316 * In case this a root stub inode (BTRFS_INODE_ROOT_STUB flag set),
317 * the ID of that root.
318 */
319 u64 ref_root_id;
320 };
321
322 /* Backwards incompatible flags, lower half of inode_item::flags */
323 u32 flags;
324 /* Read-only compatibility flags, upper half of inode_item::flags */
325 u32 ro_flags;
326
327 struct btrfs_block_rsv block_rsv;
328
329 struct btrfs_delayed_node *delayed_node;
330
331 /* File creation time. */
332 u64 i_otime_sec;
333 u32 i_otime_nsec;
334
335 /* Hook into fs_info->delayed_iputs */
336 struct list_head delayed_iput;
337
338 struct rw_semaphore i_mmap_lock;
339 struct inode vfs_inode;
340 };
341
btrfs_get_first_dir_index_to_log(const struct btrfs_inode * inode)342 static inline u64 btrfs_get_first_dir_index_to_log(const struct btrfs_inode *inode)
343 {
344 return READ_ONCE(inode->first_dir_index_to_log);
345 }
346
btrfs_set_first_dir_index_to_log(struct btrfs_inode * inode,u64 index)347 static inline void btrfs_set_first_dir_index_to_log(struct btrfs_inode *inode,
348 u64 index)
349 {
350 WRITE_ONCE(inode->first_dir_index_to_log, index);
351 }
352
353 /* Type checked and const-preserving VFS inode -> btrfs inode. */
354 #define BTRFS_I(_inode) \
355 _Generic(_inode, \
356 struct inode *: container_of(_inode, struct btrfs_inode, vfs_inode), \
357 const struct inode *: (const struct btrfs_inode *)container_of( \
358 _inode, const struct btrfs_inode, vfs_inode))
359
btrfs_inode_hash(u64 objectid,const struct btrfs_root * root)360 static inline unsigned long btrfs_inode_hash(u64 objectid,
361 const struct btrfs_root *root)
362 {
363 u64 h = objectid ^ (root->root_key.objectid * GOLDEN_RATIO_PRIME);
364
365 #if BITS_PER_LONG == 32
366 h = (h >> 32) ^ (h & 0xffffffff);
367 #endif
368
369 return (unsigned long)h;
370 }
371
372 #if BITS_PER_LONG == 32
373
374 /*
375 * On 32 bit systems the i_ino of struct inode is 32 bits (unsigned long), so
376 * we use the inode's location objectid which is a u64 to avoid truncation.
377 */
btrfs_ino(const struct btrfs_inode * inode)378 static inline u64 btrfs_ino(const struct btrfs_inode *inode)
379 {
380 u64 ino = inode->objectid;
381
382 if (test_bit(BTRFS_INODE_ROOT_STUB, &inode->runtime_flags))
383 ino = inode->vfs_inode.i_ino;
384 return ino;
385 }
386
387 #else
388
btrfs_ino(const struct btrfs_inode * inode)389 static inline u64 btrfs_ino(const struct btrfs_inode *inode)
390 {
391 return inode->vfs_inode.i_ino;
392 }
393
394 #endif
395
btrfs_get_inode_key(const struct btrfs_inode * inode,struct btrfs_key * key)396 static inline void btrfs_get_inode_key(const struct btrfs_inode *inode,
397 struct btrfs_key *key)
398 {
399 key->objectid = btrfs_ino(inode);
400 key->type = BTRFS_INODE_ITEM_KEY;
401 key->offset = 0;
402 }
403
btrfs_set_inode_number(struct btrfs_inode * inode,u64 ino)404 static inline void btrfs_set_inode_number(struct btrfs_inode *inode, u64 ino)
405 {
406 #if BITS_PER_LONG == 32
407 inode->objectid = ino;
408 #endif
409 inode->vfs_inode.i_ino = ino;
410 }
411
btrfs_i_size_write(struct btrfs_inode * inode,u64 size)412 static inline void btrfs_i_size_write(struct btrfs_inode *inode, u64 size)
413 {
414 i_size_write(&inode->vfs_inode, size);
415 inode->disk_i_size = size;
416 }
417
btrfs_is_free_space_inode(const struct btrfs_inode * inode)418 static inline bool btrfs_is_free_space_inode(const struct btrfs_inode *inode)
419 {
420 return test_bit(BTRFS_INODE_FREE_SPACE_INODE, &inode->runtime_flags);
421 }
422
is_data_inode(const struct btrfs_inode * inode)423 static inline bool is_data_inode(const struct btrfs_inode *inode)
424 {
425 return btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID;
426 }
427
btrfs_mod_outstanding_extents(struct btrfs_inode * inode,int mod)428 static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode,
429 int mod)
430 {
431 lockdep_assert_held(&inode->lock);
432 inode->outstanding_extents += mod;
433 if (btrfs_is_free_space_inode(inode))
434 return;
435 trace_btrfs_inode_mod_outstanding_extents(inode->root, btrfs_ino(inode),
436 mod, inode->outstanding_extents);
437 }
438
439 /*
440 * Called every time after doing a buffered, direct IO or memory mapped write.
441 *
442 * This is to ensure that if we write to a file that was previously fsynced in
443 * the current transaction, then try to fsync it again in the same transaction,
444 * we will know that there were changes in the file and that it needs to be
445 * logged.
446 */
btrfs_set_inode_last_sub_trans(struct btrfs_inode * inode)447 static inline void btrfs_set_inode_last_sub_trans(struct btrfs_inode *inode)
448 {
449 spin_lock(&inode->lock);
450 inode->last_sub_trans = inode->root->log_transid;
451 spin_unlock(&inode->lock);
452 }
453
454 /*
455 * Should be called while holding the inode's VFS lock in exclusive mode, or
456 * while holding the inode's mmap lock (struct btrfs_inode::i_mmap_lock) in
457 * either shared or exclusive mode, or in a context where no one else can access
458 * the inode concurrently (during inode creation or when loading an inode from
459 * disk).
460 */
btrfs_set_inode_full_sync(struct btrfs_inode * inode)461 static inline void btrfs_set_inode_full_sync(struct btrfs_inode *inode)
462 {
463 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
464 /*
465 * The inode may have been part of a reflink operation in the last
466 * transaction that modified it, and then a fsync has reset the
467 * last_reflink_trans to avoid subsequent fsyncs in the same
468 * transaction to do unnecessary work. So update last_reflink_trans
469 * to the last_trans value (we have to be pessimistic and assume a
470 * reflink happened).
471 *
472 * The ->last_trans is protected by the inode's spinlock and we can
473 * have a concurrent ordered extent completion update it. Also set
474 * last_reflink_trans to ->last_trans only if the former is less than
475 * the later, because we can be called in a context where
476 * last_reflink_trans was set to the current transaction generation
477 * while ->last_trans was not yet updated in the current transaction,
478 * and therefore has a lower value.
479 */
480 spin_lock(&inode->lock);
481 if (inode->last_reflink_trans < inode->last_trans)
482 inode->last_reflink_trans = inode->last_trans;
483 spin_unlock(&inode->lock);
484 }
485
btrfs_inode_in_log(struct btrfs_inode * inode,u64 generation)486 static inline bool btrfs_inode_in_log(struct btrfs_inode *inode, u64 generation)
487 {
488 bool ret = false;
489
490 spin_lock(&inode->lock);
491 if (inode->logged_trans == generation &&
492 inode->last_sub_trans <= inode->last_log_commit &&
493 inode->last_sub_trans <= btrfs_get_root_last_log_commit(inode->root))
494 ret = true;
495 spin_unlock(&inode->lock);
496 return ret;
497 }
498
499 /*
500 * Check if the inode has flags compatible with compression
501 */
btrfs_inode_can_compress(const struct btrfs_inode * inode)502 static inline bool btrfs_inode_can_compress(const struct btrfs_inode *inode)
503 {
504 if (inode->flags & BTRFS_INODE_NODATACOW ||
505 inode->flags & BTRFS_INODE_NODATASUM)
506 return false;
507 return true;
508 }
509
btrfs_assert_inode_locked(struct btrfs_inode * inode)510 static inline void btrfs_assert_inode_locked(struct btrfs_inode *inode)
511 {
512 /* Immediately trigger a crash if the inode is not locked. */
513 ASSERT(inode_is_locked(&inode->vfs_inode));
514 /* Trigger a splat in dmesg if this task is not holding the lock. */
515 lockdep_assert_held(&inode->vfs_inode.i_rwsem);
516 }
517
518 /* Array of bytes with variable length, hexadecimal format 0x1234 */
519 #define CSUM_FMT "0x%*phN"
520 #define CSUM_FMT_VALUE(size, bytes) size, bytes
521
522 int btrfs_check_sector_csum(struct btrfs_fs_info *fs_info, struct page *page,
523 u32 pgoff, u8 *csum, const u8 * const csum_expected);
524 bool btrfs_data_csum_ok(struct btrfs_bio *bbio, struct btrfs_device *dev,
525 u32 bio_offset, struct bio_vec *bv);
526 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
527 struct btrfs_file_extent *file_extent,
528 bool nowait, bool strict);
529
530 void btrfs_del_delalloc_inode(struct btrfs_inode *inode);
531 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
532 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
533 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
534 struct btrfs_inode *dir, struct btrfs_inode *inode,
535 const struct fscrypt_str *name);
536 int btrfs_add_link(struct btrfs_trans_handle *trans,
537 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
538 const struct fscrypt_str *name, int add_backref, u64 index);
539 int btrfs_delete_subvolume(struct btrfs_inode *dir, struct dentry *dentry);
540 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
541 int front);
542
543 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
544 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
545 bool in_reclaim_context);
546 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
547 unsigned int extra_bits,
548 struct extent_state **cached_state);
549
550 struct btrfs_new_inode_args {
551 /* Input */
552 struct inode *dir;
553 struct dentry *dentry;
554 struct inode *inode;
555 bool orphan;
556 bool subvol;
557
558 /* Output from btrfs_new_inode_prepare(), input to btrfs_create_new_inode(). */
559 struct posix_acl *default_acl;
560 struct posix_acl *acl;
561 struct fscrypt_name fname;
562 };
563
564 int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args,
565 unsigned int *trans_num_items);
566 int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
567 struct btrfs_new_inode_args *args);
568 void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args);
569 struct inode *btrfs_new_subvol_inode(struct mnt_idmap *idmap,
570 struct inode *dir);
571 void btrfs_set_delalloc_extent(struct btrfs_inode *inode, struct extent_state *state,
572 u32 bits);
573 void btrfs_clear_delalloc_extent(struct btrfs_inode *inode,
574 struct extent_state *state, u32 bits);
575 void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new,
576 struct extent_state *other);
577 void btrfs_split_delalloc_extent(struct btrfs_inode *inode,
578 struct extent_state *orig, u64 split);
579 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
580 void btrfs_evict_inode(struct inode *inode);
581 struct inode *btrfs_alloc_inode(struct super_block *sb);
582 void btrfs_destroy_inode(struct inode *inode);
583 void btrfs_free_inode(struct inode *inode);
584 int btrfs_drop_inode(struct inode *inode);
585 int __init btrfs_init_cachep(void);
586 void __cold btrfs_destroy_cachep(void);
587 struct inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
588 struct btrfs_path *path);
589 struct inode *btrfs_iget(u64 ino, struct btrfs_root *root);
590 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
591 struct folio *folio, u64 start, u64 len);
592 int btrfs_update_inode(struct btrfs_trans_handle *trans,
593 struct btrfs_inode *inode);
594 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
595 struct btrfs_inode *inode);
596 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct btrfs_inode *inode);
597 int btrfs_orphan_cleanup(struct btrfs_root *root);
598 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
599 void btrfs_add_delayed_iput(struct btrfs_inode *inode);
600 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
601 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
602 int btrfs_prealloc_file_range(struct inode *inode, int mode,
603 u64 start, u64 num_bytes, u64 min_size,
604 loff_t actual_len, u64 *alloc_hint);
605 int btrfs_prealloc_file_range_trans(struct inode *inode,
606 struct btrfs_trans_handle *trans, int mode,
607 u64 start, u64 num_bytes, u64 min_size,
608 loff_t actual_len, u64 *alloc_hint);
609 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct folio *locked_folio,
610 u64 start, u64 end, struct writeback_control *wbc);
611 int btrfs_writepage_cow_fixup(struct folio *folio);
612 int btrfs_encoded_io_compression_from_extent(struct btrfs_fs_info *fs_info,
613 int compress_type);
614 int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
615 u64 file_offset, u64 disk_bytenr,
616 u64 disk_io_size,
617 struct page **pages);
618 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
619 struct btrfs_ioctl_encoded_io_args *encoded);
620 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
621 const struct btrfs_ioctl_encoded_io_args *encoded);
622
623 struct btrfs_inode *btrfs_find_first_inode(struct btrfs_root *root, u64 min_ino);
624
625 extern const struct dentry_operations btrfs_dentry_operations;
626
627 /* Inode locking type flags, by default the exclusive lock is taken. */
628 enum btrfs_ilock_type {
629 ENUM_BIT(BTRFS_ILOCK_SHARED),
630 ENUM_BIT(BTRFS_ILOCK_TRY),
631 ENUM_BIT(BTRFS_ILOCK_MMAP),
632 };
633
634 int btrfs_inode_lock(struct btrfs_inode *inode, unsigned int ilock_flags);
635 void btrfs_inode_unlock(struct btrfs_inode *inode, unsigned int ilock_flags);
636 void btrfs_update_inode_bytes(struct btrfs_inode *inode, const u64 add_bytes,
637 const u64 del_bytes);
638 void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end);
639 u64 btrfs_get_extent_allocation_hint(struct btrfs_inode *inode, u64 start,
640 u64 num_bytes);
641 struct extent_map *btrfs_create_io_em(struct btrfs_inode *inode, u64 start,
642 const struct btrfs_file_extent *file_extent,
643 int type);
644
645 #endif
646