1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef BTRFS_EXTENT_IO_H
4 #define BTRFS_EXTENT_IO_H
5
6 #include <linux/rbtree.h>
7 #include <linux/refcount.h>
8 #include "ulist.h"
9
10 /* bits for the extent state */
11 #define EXTENT_DIRTY (1U << 0)
12 #define EXTENT_UPTODATE (1U << 1)
13 #define EXTENT_LOCKED (1U << 2)
14 #define EXTENT_NEW (1U << 3)
15 #define EXTENT_DELALLOC (1U << 4)
16 #define EXTENT_DEFRAG (1U << 5)
17 #define EXTENT_BOUNDARY (1U << 6)
18 #define EXTENT_NODATASUM (1U << 7)
19 #define EXTENT_CLEAR_META_RESV (1U << 8)
20 #define EXTENT_NEED_WAIT (1U << 9)
21 #define EXTENT_DAMAGED (1U << 10)
22 #define EXTENT_NORESERVE (1U << 11)
23 #define EXTENT_QGROUP_RESERVED (1U << 12)
24 #define EXTENT_CLEAR_DATA_RESV (1U << 13)
25 #define EXTENT_DELALLOC_NEW (1U << 14)
26 #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
27 EXTENT_CLEAR_DATA_RESV)
28 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING)
29
30 /*
31 * Redefined bits above which are used only in the device allocation tree,
32 * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
33 * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
34 * manipulation functions
35 */
36 #define CHUNK_ALLOCATED EXTENT_DIRTY
37 #define CHUNK_TRIMMED EXTENT_DEFRAG
38
39 /*
40 * flags for bio submission. The high bits indicate the compression
41 * type for this bio
42 */
43 #define EXTENT_BIO_COMPRESSED 1
44 #define EXTENT_BIO_FLAG_SHIFT 16
45
46 enum {
47 EXTENT_BUFFER_UPTODATE,
48 EXTENT_BUFFER_DIRTY,
49 EXTENT_BUFFER_CORRUPT,
50 /* this got triggered by readahead */
51 EXTENT_BUFFER_READAHEAD,
52 EXTENT_BUFFER_TREE_REF,
53 EXTENT_BUFFER_STALE,
54 EXTENT_BUFFER_WRITEBACK,
55 /* read IO error */
56 EXTENT_BUFFER_READ_ERR,
57 EXTENT_BUFFER_UNMAPPED,
58 EXTENT_BUFFER_IN_TREE,
59 /* write IO error */
60 EXTENT_BUFFER_WRITE_ERR,
61 };
62
63 /* these are flags for __process_pages_contig */
64 #define PAGE_UNLOCK (1 << 0)
65 #define PAGE_CLEAR_DIRTY (1 << 1)
66 #define PAGE_SET_WRITEBACK (1 << 2)
67 #define PAGE_END_WRITEBACK (1 << 3)
68 #define PAGE_SET_PRIVATE2 (1 << 4)
69 #define PAGE_SET_ERROR (1 << 5)
70 #define PAGE_LOCK (1 << 6)
71
72 /*
73 * page->private values. Every page that is controlled by the extent
74 * map has page->private set to one.
75 */
76 #define EXTENT_PAGE_PRIVATE 1
77
78 /*
79 * The extent buffer bitmap operations are done with byte granularity instead of
80 * word granularity for two reasons:
81 * 1. The bitmaps must be little-endian on disk.
82 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
83 * single word in a bitmap may straddle two pages in the extent buffer.
84 */
85 #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
86 #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
87 #define BITMAP_FIRST_BYTE_MASK(start) \
88 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
89 #define BITMAP_LAST_BYTE_MASK(nbits) \
90 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
91
92 struct extent_state;
93 struct btrfs_root;
94 struct btrfs_inode;
95 struct btrfs_io_bio;
96 struct io_failure_record;
97
98
99 typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
100 struct bio *bio, u64 bio_offset);
101
102 struct extent_io_ops {
103 /*
104 * The following callbacks must be always defined, the function
105 * pointer will be called unconditionally.
106 */
107 blk_status_t (*submit_bio_hook)(struct inode *inode, struct bio *bio,
108 int mirror_num, unsigned long bio_flags);
109 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
110 struct page *page, u64 start, u64 end,
111 int mirror);
112 };
113
114 enum {
115 IO_TREE_FS_INFO_FREED_EXTENTS0,
116 IO_TREE_FS_INFO_FREED_EXTENTS1,
117 IO_TREE_INODE_IO,
118 IO_TREE_INODE_IO_FAILURE,
119 IO_TREE_RELOC_BLOCKS,
120 IO_TREE_TRANS_DIRTY_PAGES,
121 IO_TREE_ROOT_DIRTY_LOG_PAGES,
122 IO_TREE_SELFTEST,
123 };
124
125 struct extent_io_tree {
126 struct rb_root state;
127 struct btrfs_fs_info *fs_info;
128 void *private_data;
129 u64 dirty_bytes;
130 bool track_uptodate;
131
132 /* Who owns this io tree, should be one of IO_TREE_* */
133 u8 owner;
134
135 spinlock_t lock;
136 const struct extent_io_ops *ops;
137 };
138
139 struct extent_state {
140 u64 start;
141 u64 end; /* inclusive */
142 struct rb_node rb_node;
143
144 /* ADD NEW ELEMENTS AFTER THIS */
145 wait_queue_head_t wq;
146 refcount_t refs;
147 unsigned state;
148
149 struct io_failure_record *failrec;
150
151 #ifdef CONFIG_BTRFS_DEBUG
152 struct list_head leak_list;
153 #endif
154 };
155
156 #define INLINE_EXTENT_BUFFER_PAGES 16
157 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
158 struct extent_buffer {
159 u64 start;
160 unsigned long len;
161 unsigned long bflags;
162 struct btrfs_fs_info *fs_info;
163 spinlock_t refs_lock;
164 atomic_t refs;
165 atomic_t io_pages;
166 int read_mirror;
167 struct rcu_head rcu_head;
168 pid_t lock_owner;
169
170 int blocking_writers;
171 atomic_t blocking_readers;
172 bool lock_nested;
173 /* >= 0 if eb belongs to a log tree, -1 otherwise */
174 short log_index;
175
176 /* protects write locks */
177 rwlock_t lock;
178
179 /* readers use lock_wq while they wait for the write
180 * lock holders to unlock
181 */
182 wait_queue_head_t write_lock_wq;
183
184 /* writers use read_lock_wq while they wait for readers
185 * to unlock
186 */
187 wait_queue_head_t read_lock_wq;
188 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
189 #ifdef CONFIG_BTRFS_DEBUG
190 int spinning_writers;
191 atomic_t spinning_readers;
192 atomic_t read_locks;
193 int write_locks;
194 struct list_head leak_list;
195 #endif
196 };
197
198 /*
199 * Structure to record how many bytes and which ranges are set/cleared
200 */
201 struct extent_changeset {
202 /* How many bytes are set/cleared in this operation */
203 unsigned int bytes_changed;
204
205 /* Changed ranges */
206 struct ulist range_changed;
207 };
208
extent_changeset_init(struct extent_changeset * changeset)209 static inline void extent_changeset_init(struct extent_changeset *changeset)
210 {
211 changeset->bytes_changed = 0;
212 ulist_init(&changeset->range_changed);
213 }
214
extent_changeset_alloc(void)215 static inline struct extent_changeset *extent_changeset_alloc(void)
216 {
217 struct extent_changeset *ret;
218
219 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
220 if (!ret)
221 return NULL;
222
223 extent_changeset_init(ret);
224 return ret;
225 }
226
extent_changeset_release(struct extent_changeset * changeset)227 static inline void extent_changeset_release(struct extent_changeset *changeset)
228 {
229 if (!changeset)
230 return;
231 changeset->bytes_changed = 0;
232 ulist_release(&changeset->range_changed);
233 }
234
extent_changeset_free(struct extent_changeset * changeset)235 static inline void extent_changeset_free(struct extent_changeset *changeset)
236 {
237 if (!changeset)
238 return;
239 extent_changeset_release(changeset);
240 kfree(changeset);
241 }
242
extent_set_compress_type(unsigned long * bio_flags,int compress_type)243 static inline void extent_set_compress_type(unsigned long *bio_flags,
244 int compress_type)
245 {
246 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
247 }
248
extent_compress_type(unsigned long bio_flags)249 static inline int extent_compress_type(unsigned long bio_flags)
250 {
251 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
252 }
253
254 struct extent_map_tree;
255
256 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
257 struct page *page,
258 size_t pg_offset,
259 u64 start, u64 len,
260 int create);
261
262 void extent_io_tree_init(struct btrfs_fs_info *fs_info,
263 struct extent_io_tree *tree, unsigned int owner,
264 void *private_data);
265 void extent_io_tree_release(struct extent_io_tree *tree);
266 int try_release_extent_mapping(struct page *page, gfp_t mask);
267 int try_release_extent_buffer(struct page *page);
268 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
269 struct extent_state **cached);
270
lock_extent(struct extent_io_tree * tree,u64 start,u64 end)271 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
272 {
273 return lock_extent_bits(tree, start, end, NULL);
274 }
275
276 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
277 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
278 get_extent_t *get_extent, int mirror_num);
279 int __init extent_io_init(void);
280 void __cold extent_io_exit(void);
281
282 u64 count_range_bits(struct extent_io_tree *tree,
283 u64 *start, u64 search_end,
284 u64 max_bytes, unsigned bits, int contig);
285
286 void free_extent_state(struct extent_state *state);
287 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
288 unsigned bits, int filled,
289 struct extent_state *cached_state);
290 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
291 unsigned bits, struct extent_changeset *changeset);
292 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
293 unsigned bits, int wake, int delete,
294 struct extent_state **cached);
295 int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
296 unsigned bits, int wake, int delete,
297 struct extent_state **cached, gfp_t mask,
298 struct extent_changeset *changeset);
299
unlock_extent(struct extent_io_tree * tree,u64 start,u64 end)300 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
301 {
302 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL);
303 }
304
unlock_extent_cached(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)305 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
306 u64 end, struct extent_state **cached)
307 {
308 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
309 GFP_NOFS, NULL);
310 }
311
unlock_extent_cached_atomic(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)312 static inline int unlock_extent_cached_atomic(struct extent_io_tree *tree,
313 u64 start, u64 end, struct extent_state **cached)
314 {
315 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
316 GFP_ATOMIC, NULL);
317 }
318
clear_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,unsigned bits)319 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
320 u64 end, unsigned bits)
321 {
322 int wake = 0;
323
324 if (bits & EXTENT_LOCKED)
325 wake = 1;
326
327 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL);
328 }
329
330 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
331 unsigned bits, struct extent_changeset *changeset);
332 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
333 unsigned bits, u64 *failed_start,
334 struct extent_state **cached_state, gfp_t mask);
335 int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start, u64 end,
336 unsigned bits);
337
set_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,unsigned bits)338 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
339 u64 end, unsigned bits)
340 {
341 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
342 }
343
clear_extent_uptodate(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)344 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
345 u64 end, struct extent_state **cached_state)
346 {
347 return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
348 cached_state, GFP_NOFS, NULL);
349 }
350
set_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,gfp_t mask)351 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
352 u64 end, gfp_t mask)
353 {
354 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
355 NULL, mask);
356 }
357
clear_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)358 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
359 u64 end, struct extent_state **cached)
360 {
361 return clear_extent_bit(tree, start, end,
362 EXTENT_DIRTY | EXTENT_DELALLOC |
363 EXTENT_DO_ACCOUNTING, 0, 0, cached);
364 }
365
366 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
367 unsigned bits, unsigned clear_bits,
368 struct extent_state **cached_state);
369
set_extent_delalloc(struct extent_io_tree * tree,u64 start,u64 end,unsigned int extra_bits,struct extent_state ** cached_state)370 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
371 u64 end, unsigned int extra_bits,
372 struct extent_state **cached_state)
373 {
374 return set_extent_bit(tree, start, end,
375 EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
376 NULL, cached_state, GFP_NOFS);
377 }
378
set_extent_defrag(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)379 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
380 u64 end, struct extent_state **cached_state)
381 {
382 return set_extent_bit(tree, start, end,
383 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
384 NULL, cached_state, GFP_NOFS);
385 }
386
set_extent_new(struct extent_io_tree * tree,u64 start,u64 end)387 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
388 u64 end)
389 {
390 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
391 GFP_NOFS);
392 }
393
set_extent_uptodate(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state,gfp_t mask)394 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
395 u64 end, struct extent_state **cached_state, gfp_t mask)
396 {
397 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
398 cached_state, mask);
399 }
400
401 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
402 u64 *start_ret, u64 *end_ret, unsigned bits,
403 struct extent_state **cached_state);
404 void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
405 u64 *start_ret, u64 *end_ret, unsigned bits);
406 int extent_invalidatepage(struct extent_io_tree *tree,
407 struct page *page, unsigned long offset);
408 int extent_write_full_page(struct page *page, struct writeback_control *wbc);
409 int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
410 int mode);
411 int extent_writepages(struct address_space *mapping,
412 struct writeback_control *wbc);
413 int btree_write_cache_pages(struct address_space *mapping,
414 struct writeback_control *wbc);
415 int extent_readpages(struct address_space *mapping, struct list_head *pages,
416 unsigned nr_pages);
417 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
418 __u64 start, __u64 len);
419 void set_page_extent_mapped(struct page *page);
420
421 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
422 u64 start);
423 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
424 u64 start, unsigned long len);
425 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
426 u64 start);
427 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
428 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
429 u64 start);
430 void free_extent_buffer(struct extent_buffer *eb);
431 void free_extent_buffer_stale(struct extent_buffer *eb);
432 #define WAIT_NONE 0
433 #define WAIT_COMPLETE 1
434 #define WAIT_PAGE_LOCK 2
435 int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
436 int mirror_num);
437 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
438
num_extent_pages(const struct extent_buffer * eb)439 static inline int num_extent_pages(const struct extent_buffer *eb)
440 {
441 return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
442 (eb->start >> PAGE_SHIFT);
443 }
444
extent_buffer_get(struct extent_buffer * eb)445 static inline void extent_buffer_get(struct extent_buffer *eb)
446 {
447 atomic_inc(&eb->refs);
448 }
449
extent_buffer_uptodate(struct extent_buffer * eb)450 static inline int extent_buffer_uptodate(struct extent_buffer *eb)
451 {
452 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
453 }
454
455 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
456 unsigned long start, unsigned long len);
457 void read_extent_buffer(const struct extent_buffer *eb, void *dst,
458 unsigned long start,
459 unsigned long len);
460 int read_extent_buffer_to_user(const struct extent_buffer *eb,
461 void __user *dst, unsigned long start,
462 unsigned long len);
463 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
464 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
465 const void *src);
466 void write_extent_buffer(struct extent_buffer *eb, const void *src,
467 unsigned long start, unsigned long len);
468 void copy_extent_buffer_full(struct extent_buffer *dst,
469 struct extent_buffer *src);
470 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
471 unsigned long dst_offset, unsigned long src_offset,
472 unsigned long len);
473 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
474 unsigned long src_offset, unsigned long len);
475 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
476 unsigned long src_offset, unsigned long len);
477 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
478 unsigned long len);
479 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
480 unsigned long pos);
481 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
482 unsigned long pos, unsigned long len);
483 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
484 unsigned long pos, unsigned long len);
485 void clear_extent_buffer_dirty(struct extent_buffer *eb);
486 bool set_extent_buffer_dirty(struct extent_buffer *eb);
487 void set_extent_buffer_uptodate(struct extent_buffer *eb);
488 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
489 int extent_buffer_under_io(struct extent_buffer *eb);
490 int map_private_extent_buffer(const struct extent_buffer *eb,
491 unsigned long offset, unsigned long min_len,
492 char **map, unsigned long *map_start,
493 unsigned long *map_len);
494 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
495 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
496 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
497 struct page *locked_page,
498 unsigned bits_to_clear,
499 unsigned long page_ops);
500 struct bio *btrfs_bio_alloc(u64 first_byte);
501 struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
502 struct bio *btrfs_bio_clone(struct bio *bio);
503 struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
504
505 struct btrfs_fs_info;
506 struct btrfs_inode;
507
508 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
509 u64 length, u64 logical, struct page *page,
510 unsigned int pg_offset, int mirror_num);
511 int clean_io_failure(struct btrfs_fs_info *fs_info,
512 struct extent_io_tree *failure_tree,
513 struct extent_io_tree *io_tree, u64 start,
514 struct page *page, u64 ino, unsigned int pg_offset);
515 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
516 int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num);
517
518 /*
519 * When IO fails, either with EIO or csum verification fails, we
520 * try other mirrors that might have a good copy of the data. This
521 * io_failure_record is used to record state as we go through all the
522 * mirrors. If another mirror has good data, the page is set up to date
523 * and things continue. If a good mirror can't be found, the original
524 * bio end_io callback is called to indicate things have failed.
525 */
526 struct io_failure_record {
527 struct page *page;
528 u64 start;
529 u64 len;
530 u64 logical;
531 unsigned long bio_flags;
532 int this_mirror;
533 int failed_mirror;
534 int in_validation;
535 };
536
537
538 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
539 u64 end);
540 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
541 struct io_failure_record **failrec_ret);
542 bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages,
543 struct io_failure_record *failrec, int fail_mirror);
544 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
545 struct io_failure_record *failrec,
546 struct page *page, int pg_offset, int icsum,
547 bio_end_io_t *endio_func, void *data);
548 int free_io_failure(struct extent_io_tree *failure_tree,
549 struct extent_io_tree *io_tree,
550 struct io_failure_record *rec);
551 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
552 bool find_lock_delalloc_range(struct inode *inode,
553 struct page *locked_page, u64 *start,
554 u64 *end);
555 #endif
556 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
557 u64 start);
558
559 #endif
560