fs/btrfs/extent_io.h

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