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TOMOYO Linux Cross Reference
Linux/fs/btrfs/extent_io.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __EXTENTIO__
  3 #define __EXTENTIO__
  4 
  5 #include <linux/rbtree.h>
  6 #include <linux/refcount.h>
  7 #include "ulist.h"
  8 
  9 /* bits for the extent state */
 10 #define EXTENT_DIRTY            (1U << 0)
 11 #define EXTENT_WRITEBACK        (1U << 1)
 12 #define EXTENT_UPTODATE         (1U << 2)
 13 #define EXTENT_LOCKED           (1U << 3)
 14 #define EXTENT_NEW              (1U << 4)
 15 #define EXTENT_DELALLOC         (1U << 5)
 16 #define EXTENT_DEFRAG           (1U << 6)
 17 #define EXTENT_BOUNDARY         (1U << 9)
 18 #define EXTENT_NODATASUM        (1U << 10)
 19 #define EXTENT_CLEAR_META_RESV  (1U << 11)
 20 #define EXTENT_FIRST_DELALLOC   (1U << 12)
 21 #define EXTENT_NEED_WAIT        (1U << 13)
 22 #define EXTENT_DAMAGED          (1U << 14)
 23 #define EXTENT_NORESERVE        (1U << 15)
 24 #define EXTENT_QGROUP_RESERVED  (1U << 16)
 25 #define EXTENT_CLEAR_DATA_RESV  (1U << 17)
 26 #define EXTENT_DELALLOC_NEW     (1U << 18)
 27 #define EXTENT_IOBITS           (EXTENT_LOCKED | EXTENT_WRITEBACK)
 28 #define EXTENT_DO_ACCOUNTING    (EXTENT_CLEAR_META_RESV | \
 29                                  EXTENT_CLEAR_DATA_RESV)
 30 #define EXTENT_CTLBITS          (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
 31 
 32 /*
 33  * flags for bio submission. The high bits indicate the compression
 34  * type for this bio
 35  */
 36 #define EXTENT_BIO_COMPRESSED 1
 37 #define EXTENT_BIO_FLAG_SHIFT 16
 38 
 39 /* these are bit numbers for test/set bit */
 40 #define EXTENT_BUFFER_UPTODATE 0
 41 #define EXTENT_BUFFER_DIRTY 2
 42 #define EXTENT_BUFFER_CORRUPT 3
 43 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
 44 #define EXTENT_BUFFER_TREE_REF 5
 45 #define EXTENT_BUFFER_STALE 6
 46 #define EXTENT_BUFFER_WRITEBACK 7
 47 #define EXTENT_BUFFER_READ_ERR 8        /* read IO error */
 48 #define EXTENT_BUFFER_DUMMY 9
 49 #define EXTENT_BUFFER_IN_TREE 10
 50 #define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
 51 
 52 /* these are flags for __process_pages_contig */
 53 #define PAGE_UNLOCK             (1 << 0)
 54 #define PAGE_CLEAR_DIRTY        (1 << 1)
 55 #define PAGE_SET_WRITEBACK      (1 << 2)
 56 #define PAGE_END_WRITEBACK      (1 << 3)
 57 #define PAGE_SET_PRIVATE2       (1 << 4)
 58 #define PAGE_SET_ERROR          (1 << 5)
 59 #define PAGE_LOCK               (1 << 6)
 60 
 61 /*
 62  * page->private values.  Every page that is controlled by the extent
 63  * map has page->private set to one.
 64  */
 65 #define EXTENT_PAGE_PRIVATE 1
 66 
 67 /*
 68  * The extent buffer bitmap operations are done with byte granularity instead of
 69  * word granularity for two reasons:
 70  * 1. The bitmaps must be little-endian on disk.
 71  * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 72  *    single word in a bitmap may straddle two pages in the extent buffer.
 73  */
 74 #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
 75 #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
 76 #define BITMAP_FIRST_BYTE_MASK(start) \
 77         ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
 78 #define BITMAP_LAST_BYTE_MASK(nbits) \
 79         (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
 80 
 81 static inline int le_test_bit(int nr, const u8 *addr)
 82 {
 83         return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
 84 }
 85 
 86 extern void le_bitmap_set(u8 *map, unsigned int start, int len);
 87 extern void le_bitmap_clear(u8 *map, unsigned int start, int len);
 88 
 89 struct extent_state;
 90 struct btrfs_root;
 91 struct btrfs_inode;
 92 struct btrfs_io_bio;
 93 struct io_failure_record;
 94 
 95 typedef blk_status_t (extent_submit_bio_hook_t)(void *private_data, struct bio *bio,
 96                                        int mirror_num, unsigned long bio_flags,
 97                                        u64 bio_offset);
 98 struct extent_io_ops {
 99         /*
100          * The following callbacks must be allways defined, the function
101          * pointer will be called unconditionally.
102          */
103         extent_submit_bio_hook_t *submit_bio_hook;
104         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
105                                     struct page *page, u64 start, u64 end,
106                                     int mirror);
107         int (*merge_bio_hook)(struct page *page, unsigned long offset,
108                               size_t size, struct bio *bio,
109                               unsigned long bio_flags);
110         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
111         struct btrfs_fs_info *(*tree_fs_info)(void *private_data);
112         void (*set_range_writeback)(void *private_data, u64 start, u64 end);
113 
114         /*
115          * Optional hooks, called if the pointer is not NULL
116          */
117         int (*fill_delalloc)(void *private_data, struct page *locked_page,
118                              u64 start, u64 end, int *page_started,
119                              unsigned long *nr_written,
120                              struct writeback_control *wbc);
121 
122         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
123         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
124                                       struct extent_state *state, int uptodate);
125         void (*set_bit_hook)(void *private_data, struct extent_state *state,
126                              unsigned *bits);
127         void (*clear_bit_hook)(void *private_data,
128                         struct extent_state *state,
129                         unsigned *bits);
130         void (*merge_extent_hook)(void *private_data,
131                                   struct extent_state *new,
132                                   struct extent_state *other);
133         void (*split_extent_hook)(void *private_data,
134                                   struct extent_state *orig, u64 split);
135         void (*check_extent_io_range)(void *private_data, const char *caller,
136                                       u64 start, u64 end);
137 };
138 
139 struct extent_io_tree {
140         struct rb_root state;
141         void *private_data;
142         u64 dirty_bytes;
143         int track_uptodate;
144         spinlock_t lock;
145         const struct extent_io_ops *ops;
146 };
147 
148 struct extent_state {
149         u64 start;
150         u64 end; /* inclusive */
151         struct rb_node rb_node;
152 
153         /* ADD NEW ELEMENTS AFTER THIS */
154         wait_queue_head_t wq;
155         refcount_t refs;
156         unsigned state;
157 
158         struct io_failure_record *failrec;
159 
160 #ifdef CONFIG_BTRFS_DEBUG
161         struct list_head leak_list;
162 #endif
163 };
164 
165 #define INLINE_EXTENT_BUFFER_PAGES 16
166 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
167 struct extent_buffer {
168         u64 start;
169         unsigned long len;
170         unsigned long bflags;
171         struct btrfs_fs_info *fs_info;
172         spinlock_t refs_lock;
173         atomic_t refs;
174         atomic_t io_pages;
175         int read_mirror;
176         struct rcu_head rcu_head;
177         pid_t lock_owner;
178 
179         /* count of read lock holders on the extent buffer */
180         atomic_t write_locks;
181         atomic_t read_locks;
182         atomic_t blocking_writers;
183         atomic_t blocking_readers;
184         atomic_t spinning_readers;
185         atomic_t spinning_writers;
186         short lock_nested;
187         /* >= 0 if eb belongs to a log tree, -1 otherwise */
188         short log_index;
189 
190         /* protects write locks */
191         rwlock_t lock;
192 
193         /* readers use lock_wq while they wait for the write
194          * lock holders to unlock
195          */
196         wait_queue_head_t write_lock_wq;
197 
198         /* writers use read_lock_wq while they wait for readers
199          * to unlock
200          */
201         wait_queue_head_t read_lock_wq;
202         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
203 #ifdef CONFIG_BTRFS_DEBUG
204         struct list_head leak_list;
205 #endif
206 };
207 
208 /*
209  * Structure to record how many bytes and which ranges are set/cleared
210  */
211 struct extent_changeset {
212         /* How many bytes are set/cleared in this operation */
213         unsigned int bytes_changed;
214 
215         /* Changed ranges */
216         struct ulist range_changed;
217 };
218 
219 static inline void extent_changeset_init(struct extent_changeset *changeset)
220 {
221         changeset->bytes_changed = 0;
222         ulist_init(&changeset->range_changed);
223 }
224 
225 static inline struct extent_changeset *extent_changeset_alloc(void)
226 {
227         struct extent_changeset *ret;
228 
229         ret = kmalloc(sizeof(*ret), GFP_KERNEL);
230         if (!ret)
231                 return NULL;
232 
233         extent_changeset_init(ret);
234         return ret;
235 }
236 
237 static inline void extent_changeset_release(struct extent_changeset *changeset)
238 {
239         if (!changeset)
240                 return;
241         changeset->bytes_changed = 0;
242         ulist_release(&changeset->range_changed);
243 }
244 
245 static inline void extent_changeset_free(struct extent_changeset *changeset)
246 {
247         if (!changeset)
248                 return;
249         extent_changeset_release(changeset);
250         kfree(changeset);
251 }
252 
253 static inline void extent_set_compress_type(unsigned long *bio_flags,
254                                             int compress_type)
255 {
256         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
257 }
258 
259 static inline int extent_compress_type(unsigned long bio_flags)
260 {
261         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
262 }
263 
264 struct extent_map_tree;
265 
266 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
267                                           struct page *page,
268                                           size_t pg_offset,
269                                           u64 start, u64 len,
270                                           int create);
271 
272 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data);
273 int try_release_extent_mapping(struct extent_map_tree *map,
274                                struct extent_io_tree *tree, struct page *page,
275                                gfp_t mask);
276 int try_release_extent_buffer(struct page *page);
277 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
278                      struct extent_state **cached);
279 
280 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
281 {
282         return lock_extent_bits(tree, start, end, NULL);
283 }
284 
285 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
286 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
287                           get_extent_t *get_extent, int mirror_num);
288 int __init extent_io_init(void);
289 void extent_io_exit(void);
290 
291 u64 count_range_bits(struct extent_io_tree *tree,
292                      u64 *start, u64 search_end,
293                      u64 max_bytes, unsigned bits, int contig);
294 
295 void free_extent_state(struct extent_state *state);
296 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
297                    unsigned bits, int filled,
298                    struct extent_state *cached_state);
299 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
300                 unsigned bits, struct extent_changeset *changeset);
301 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
302                      unsigned bits, int wake, int delete,
303                      struct extent_state **cached, gfp_t mask);
304 
305 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
306 {
307         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
308                                 GFP_NOFS);
309 }
310 
311 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
312                 u64 end, struct extent_state **cached, gfp_t mask)
313 {
314         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
315                                 mask);
316 }
317 
318 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
319                 u64 end, unsigned bits)
320 {
321         int wake = 0;
322 
323         if (bits & EXTENT_LOCKED)
324                 wake = 1;
325 
326         return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
327                         GFP_NOFS);
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 
336 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
337                 u64 end, unsigned bits)
338 {
339         return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
340 }
341 
342 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
343                 u64 end, struct extent_state **cached_state, gfp_t mask)
344 {
345         return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
346                                 cached_state, mask);
347 }
348 
349 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
350                 u64 end, gfp_t mask)
351 {
352         return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
353                               NULL, mask);
354 }
355 
356 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
357                 u64 end)
358 {
359         return clear_extent_bit(tree, start, end,
360                                 EXTENT_DIRTY | EXTENT_DELALLOC |
361                                 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
362 }
363 
364 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
365                        unsigned bits, unsigned clear_bits,
366                        struct extent_state **cached_state);
367 
368 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
369                                       u64 end, unsigned int extra_bits,
370                                       struct extent_state **cached_state)
371 {
372         return set_extent_bit(tree, start, end,
373                               EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
374                               NULL, cached_state, GFP_NOFS);
375 }
376 
377 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
378                 u64 end, struct extent_state **cached_state)
379 {
380         return set_extent_bit(tree, start, end,
381                               EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
382                               NULL, cached_state, GFP_NOFS);
383 }
384 
385 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
386                 u64 end)
387 {
388         return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
389                         GFP_NOFS);
390 }
391 
392 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
393                 u64 end, struct extent_state **cached_state, gfp_t mask)
394 {
395         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
396                               cached_state, mask);
397 }
398 
399 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
400                           u64 *start_ret, u64 *end_ret, unsigned bits,
401                           struct extent_state **cached_state);
402 int extent_invalidatepage(struct extent_io_tree *tree,
403                           struct page *page, unsigned long offset);
404 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
405                           get_extent_t *get_extent,
406                           struct writeback_control *wbc);
407 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
408                               u64 start, u64 end, get_extent_t *get_extent,
409                               int mode);
410 int extent_writepages(struct extent_io_tree *tree,
411                       struct address_space *mapping,
412                       get_extent_t *get_extent,
413                       struct writeback_control *wbc);
414 int btree_write_cache_pages(struct address_space *mapping,
415                             struct writeback_control *wbc);
416 int extent_readpages(struct extent_io_tree *tree,
417                      struct address_space *mapping,
418                      struct list_head *pages, unsigned nr_pages,
419                      get_extent_t get_extent);
420 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
421                 __u64 start, __u64 len, get_extent_t *get_extent);
422 void set_page_extent_mapped(struct page *page);
423 
424 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
425                                           u64 start);
426 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
427                                                   u64 start, unsigned long len);
428 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
429                                                 u64 start);
430 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
431 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
432                                          u64 start);
433 void free_extent_buffer(struct extent_buffer *eb);
434 void free_extent_buffer_stale(struct extent_buffer *eb);
435 #define WAIT_NONE       0
436 #define WAIT_COMPLETE   1
437 #define WAIT_PAGE_LOCK  2
438 int read_extent_buffer_pages(struct extent_io_tree *tree,
439                              struct extent_buffer *eb, int wait,
440                              get_extent_t *get_extent, int mirror_num);
441 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
442 
443 static inline unsigned long num_extent_pages(u64 start, u64 len)
444 {
445         return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
446                 (start >> PAGE_SHIFT);
447 }
448 
449 static inline void extent_buffer_get(struct extent_buffer *eb)
450 {
451         atomic_inc(&eb->refs);
452 }
453 
454 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
455                          unsigned long start, unsigned long len);
456 void read_extent_buffer(const struct extent_buffer *eb, void *dst,
457                         unsigned long start,
458                         unsigned long len);
459 int read_extent_buffer_to_user(const struct extent_buffer *eb,
460                                void __user *dst, unsigned long start,
461                                unsigned long len);
462 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
463 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
464                 const void *src);
465 void write_extent_buffer(struct extent_buffer *eb, const void *src,
466                          unsigned long start, unsigned long len);
467 void copy_extent_buffer_full(struct extent_buffer *dst,
468                              struct extent_buffer *src);
469 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
470                         unsigned long dst_offset, unsigned long src_offset,
471                         unsigned long len);
472 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
473                            unsigned long src_offset, unsigned long len);
474 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
475                            unsigned long src_offset, unsigned long len);
476 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
477                            unsigned long len);
478 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
479                            unsigned long pos);
480 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
481                               unsigned long pos, unsigned long len);
482 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
483                                 unsigned long pos, unsigned long len);
484 void clear_extent_buffer_dirty(struct extent_buffer *eb);
485 int set_extent_buffer_dirty(struct extent_buffer *eb);
486 void set_extent_buffer_uptodate(struct extent_buffer *eb);
487 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
488 int 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                                  u64 delalloc_end, struct page *locked_page,
498                                  unsigned bits_to_clear,
499                                  unsigned long page_ops);
500 struct bio *btrfs_bio_alloc(struct block_device *bdev, 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 repair_eb_io_failure(struct btrfs_fs_info *fs_info,
517                          struct extent_buffer *eb, int mirror_num);
518 
519 /*
520  * When IO fails, either with EIO or csum verification fails, we
521  * try other mirrors that might have a good copy of the data.  This
522  * io_failure_record is used to record state as we go through all the
523  * mirrors.  If another mirror has good data, the page is set up to date
524  * and things continue.  If a good mirror can't be found, the original
525  * bio end_io callback is called to indicate things have failed.
526  */
527 struct io_failure_record {
528         struct page *page;
529         u64 start;
530         u64 len;
531         u64 logical;
532         unsigned long bio_flags;
533         int this_mirror;
534         int failed_mirror;
535         int in_validation;
536 };
537 
538 
539 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
540                 u64 end);
541 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
542                                 struct io_failure_record **failrec_ret);
543 bool btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
544                             struct io_failure_record *failrec, int fail_mirror);
545 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
546                                     struct io_failure_record *failrec,
547                                     struct page *page, int pg_offset, int icsum,
548                                     bio_end_io_t *endio_func, void *data);
549 int free_io_failure(struct extent_io_tree *failure_tree,
550                     struct extent_io_tree *io_tree,
551                     struct io_failure_record *rec);
552 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
553 noinline u64 find_lock_delalloc_range(struct inode *inode,
554                                       struct extent_io_tree *tree,
555                                       struct page *locked_page, u64 *start,
556                                       u64 *end, u64 max_bytes);
557 #endif
558 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
559                                                u64 start);
560 #endif
561 

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