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_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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 445 static inline void extent_buffer_get(struct extent_buffer *eb)
 446 {
 447         atomic_inc(&eb->refs);
 448 }
 449
 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                                  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 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, struct extent_io_tree *tree,
 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