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 (*fill_delalloc)(void *private_data, struct page *locked_page,
 110                              u64 start, u64 end, int *page_started,
 111                              unsigned long *nr_written,
 112                              struct writeback_control *wbc);
 113
 114         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 115         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 116                                       struct extent_state *state, int uptodate);
 117         void (*set_bit_hook)(void *private_data, struct extent_state *state,
 118                              unsigned *bits);
 119         void (*clear_bit_hook)(void *private_data,
 120                         struct extent_state *state,
 121                         unsigned *bits);
 122         void (*merge_extent_hook)(void *private_data,
 123                                   struct extent_state *new,
 124                                   struct extent_state *other);
 125         void (*split_extent_hook)(void *private_data,
 126                                   struct extent_state *orig, u64 split);
 127         void (*check_extent_io_range)(void *private_data, const char *caller,
 128                                       u64 start, u64 end);
 129 };
 130
 131 struct extent_io_tree {
 132         struct rb_root state;
 133         void *private_data;
 134         u64 dirty_bytes;
 135         int track_uptodate;
 136         spinlock_t lock;
 137         const struct extent_io_ops *ops;
 138 };
 139
 140 struct extent_state {
 141         u64 start;
 142         u64 end; /* inclusive */
 143         struct rb_node rb_node;
 144
 145         /* ADD NEW ELEMENTS AFTER THIS */
 146         wait_queue_head_t wq;
 147         refcount_t refs;
 148         unsigned state;
 149
 150         struct io_failure_record *failrec;
 151
 152 #ifdef CONFIG_BTRFS_DEBUG
 153         struct list_head leak_list;
 154 #endif
 155 };
 156
 157 #define INLINE_EXTENT_BUFFER_PAGES 16
 158 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
 159 struct extent_buffer {
 160         u64 start;
 161         unsigned long len;
 162         unsigned long bflags;
 163         struct btrfs_fs_info *fs_info;
 164         spinlock_t refs_lock;
 165         atomic_t refs;
 166         atomic_t io_pages;
 167         int read_mirror;
 168         struct rcu_head rcu_head;
 169         pid_t lock_owner;
 170
 171         /* count of read lock holders on the extent buffer */
 172         atomic_t write_locks;
 173         atomic_t read_locks;
 174         atomic_t blocking_writers;
 175         atomic_t blocking_readers;
 176         atomic_t spinning_readers;
 177         atomic_t spinning_writers;
 178         short lock_nested;
 179         /* >= 0 if eb belongs to a log tree, -1 otherwise */
 180         short log_index;
 181
 182         /* protects write locks */
 183         rwlock_t lock;
 184
 185         /* readers use lock_wq while they wait for the write
 186          * lock holders to unlock
 187          */
 188         wait_queue_head_t write_lock_wq;
 189
 190         /* writers use read_lock_wq while they wait for readers
 191          * to unlock
 192          */
 193         wait_queue_head_t read_lock_wq;
 194         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 195 #ifdef CONFIG_BTRFS_DEBUG
 196         struct list_head leak_list;
 197 #endif
 198 };
 199
 200 /*
 201  * Structure to record how many bytes and which ranges are set/cleared
 202  */
 203 struct extent_changeset {
 204         /* How many bytes are set/cleared in this operation */
 205         unsigned int bytes_changed;
 206
 207         /* Changed ranges */
 208         struct ulist range_changed;
 209 };
 210
 211 static inline void extent_changeset_init(struct extent_changeset *changeset)
 212 {
 213         changeset->bytes_changed = 0;
 214         ulist_init(&changeset->range_changed);
 215 }
 216
 217 static inline struct extent_changeset *extent_changeset_alloc(void)
 218 {
 219         struct extent_changeset *ret;
 220
 221         ret = kmalloc(sizeof(*ret), GFP_KERNEL);
 222         if (!ret)
 223                 return NULL;
 224
 225         extent_changeset_init(ret);
 226         return ret;
 227 }
 228
 229 static inline void extent_changeset_release(struct extent_changeset *changeset)
 230 {
 231         if (!changeset)
 232                 return;
 233         changeset->bytes_changed = 0;
 234         ulist_release(&changeset->range_changed);
 235 }
 236
 237 static inline void extent_changeset_free(struct extent_changeset *changeset)
 238 {
 239         if (!changeset)
 240                 return;
 241         extent_changeset_release(changeset);
 242         kfree(changeset);
 243 }
 244
 245 static inline void extent_set_compress_type(unsigned long *bio_flags,
 246                                             int compress_type)
 247 {
 248         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 249 }
 250
 251 static inline int extent_compress_type(unsigned long bio_flags)
 252 {
 253         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 254 }
 255
 256 struct extent_map_tree;
 257
 258 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
 259                                           struct page *page,
 260                                           size_t pg_offset,
 261                                           u64 start, u64 len,
 262                                           int create);
 263
 264 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data);
 265 int try_release_extent_mapping(struct page *page, gfp_t mask);
 266 int try_release_extent_buffer(struct page *page);
 267 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 268                      struct extent_state **cached);
 269
 270 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
 271 {
 272         return lock_extent_bits(tree, start, end, NULL);
 273 }
 274
 275 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 276 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 277                           get_extent_t *get_extent, int mirror_num);
 278 int __init extent_io_init(void);
 279 void __cold extent_io_exit(void);
 280
 281 u64 count_range_bits(struct extent_io_tree *tree,
 282                      u64 *start, u64 search_end,
 283                      u64 max_bytes, unsigned bits, int contig);
 284
 285 void free_extent_state(struct extent_state *state);
 286 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 287                    unsigned bits, int filled,
 288                    struct extent_state *cached_state);
 289 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 290                 unsigned bits, struct extent_changeset *changeset);
 291 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 292                      unsigned bits, int wake, int delete,
 293                      struct extent_state **cached);
 294 int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 295                      unsigned bits, int wake, int delete,
 296                      struct extent_state **cached, gfp_t mask,
 297                      struct extent_changeset *changeset);
 298
 299 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
 300 {
 301         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL);
 302 }
 303
 304 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
 305                 u64 end, struct extent_state **cached)
 306 {
 307         return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
 308                                 GFP_NOFS, NULL);
 309 }
 310
 311 static inline int unlock_extent_cached_atomic(struct extent_io_tree *tree,
 312                 u64 start, u64 end, struct extent_state **cached)
 313 {
 314         return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
 315                                 GFP_ATOMIC, NULL);
 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 }
 328
 329 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 330                            unsigned bits, struct extent_changeset *changeset);
 331 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 332                    unsigned bits, u64 *failed_start,
 333                    struct extent_state **cached_state, gfp_t mask);
 334
 335 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
 336                 u64 end, unsigned bits)
 337 {
 338         return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
 339 }
 340
 341 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
 342                 u64 end, struct extent_state **cached_state)
 343 {
 344         return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
 345                                 cached_state, GFP_NOFS, NULL);
 346 }
 347
 348 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
 349                 u64 end, gfp_t mask)
 350 {
 351         return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
 352                               NULL, mask);
 353 }
 354
 355 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
 356                 u64 end)
 357 {
 358         return clear_extent_bit(tree, start, end,
 359                                 EXTENT_DIRTY | EXTENT_DELALLOC |
 360                                 EXTENT_DO_ACCOUNTING, 0, 0, NULL);
 361 }
 362
 363 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 364                        unsigned bits, unsigned clear_bits,
 365                        struct extent_state **cached_state);
 366
 367 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
 368                                       u64 end, unsigned int extra_bits,
 369                                       struct extent_state **cached_state)
 370 {
 371         return set_extent_bit(tree, start, end,
 372                               EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
 373                               NULL, cached_state, GFP_NOFS);
 374 }
 375
 376 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
 377                 u64 end, struct extent_state **cached_state)
 378 {
 379         return set_extent_bit(tree, start, end,
 380                               EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
 381                               NULL, cached_state, GFP_NOFS);
 382 }
 383
 384 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
 385                 u64 end)
 386 {
 387         return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
 388                         GFP_NOFS);
 389 }
 390
 391 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
 392                 u64 end, struct extent_state **cached_state, gfp_t mask)
 393 {
 394         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
 395                               cached_state, mask);
 396 }
 397
 398 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 399                           u64 *start_ret, u64 *end_ret, unsigned bits,
 400                           struct extent_state **cached_state);
 401 int extent_invalidatepage(struct extent_io_tree *tree,
 402                           struct page *page, unsigned long offset);
 403 int extent_write_full_page(struct page *page, struct writeback_control *wbc);
 404 int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
 405                               int mode);
 406 int extent_writepages(struct address_space *mapping,
 407                       struct writeback_control *wbc);
 408 int btree_write_cache_pages(struct address_space *mapping,
 409                             struct writeback_control *wbc);
 410 int extent_readpages(struct address_space *mapping, struct list_head *pages,
 411                      unsigned nr_pages);
 412 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 413                 __u64 start, __u64 len);
 414 void set_page_extent_mapped(struct page *page);
 415
 416 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 417                                           u64 start);
 418 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 419                                                   u64 start, unsigned long len);
 420 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 421                                                 u64 start);
 422 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 423 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
 424                                          u64 start);
 425 void free_extent_buffer(struct extent_buffer *eb);
 426 void free_extent_buffer_stale(struct extent_buffer *eb);
 427 #define WAIT_NONE       0
 428 #define WAIT_COMPLETE   1
 429 #define WAIT_PAGE_LOCK  2
 430 int read_extent_buffer_pages(struct extent_io_tree *tree,
 431                              struct extent_buffer *eb, int wait,
 432                              int mirror_num);
 433 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 434
 435 static inline int num_extent_pages(const struct extent_buffer *eb)
 436 {
 437         return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
 438                (eb->start >> PAGE_SHIFT);
 439 }
 440
 441 static inline void extent_buffer_get(struct extent_buffer *eb)
 442 {
 443         atomic_inc(&eb->refs);
 444 }
 445
 446 static inline int extent_buffer_uptodate(struct extent_buffer *eb)
 447 {
 448         return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
 449 }
 450
 451 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
 452                          unsigned long start, unsigned long len);
 453 void read_extent_buffer(const struct extent_buffer *eb, void *dst,
 454                         unsigned long start,
 455                         unsigned long len);
 456 int read_extent_buffer_to_user(const struct extent_buffer *eb,
 457                                void __user *dst, unsigned long start,
 458                                unsigned long len);
 459 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
 460 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
 461                 const void *src);
 462 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 463                          unsigned long start, unsigned long len);
 464 void copy_extent_buffer_full(struct extent_buffer *dst,
 465                              struct extent_buffer *src);
 466 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 467                         unsigned long dst_offset, unsigned long src_offset,
 468                         unsigned long len);
 469 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 470                            unsigned long src_offset, unsigned long len);
 471 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 472                            unsigned long src_offset, unsigned long len);
 473 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
 474                            unsigned long len);
 475 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
 476                            unsigned long pos);
 477 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 478                               unsigned long pos, unsigned long len);
 479 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 480                                 unsigned long pos, unsigned long len);
 481 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 482 bool set_extent_buffer_dirty(struct extent_buffer *eb);
 483 void set_extent_buffer_uptodate(struct extent_buffer *eb);
 484 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
 485 int extent_buffer_under_io(struct extent_buffer *eb);
 486 int map_private_extent_buffer(const struct extent_buffer *eb,
 487                               unsigned long offset, unsigned long min_len,
 488                               char **map, unsigned long *map_start,
 489                               unsigned long *map_len);
 490 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 491 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 492 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
 493                                  u64 delalloc_end, struct page *locked_page,
 494                                  unsigned bits_to_clear,
 495                                  unsigned long page_ops);
 496 struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte);
 497 struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
 498 struct bio *btrfs_bio_clone(struct bio *bio);
 499 struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
 500
 501 struct btrfs_fs_info;
 502 struct btrfs_inode;
 503
 504 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
 505                       u64 length, u64 logical, struct page *page,
 506                       unsigned int pg_offset, int mirror_num);
 507 int clean_io_failure(struct btrfs_fs_info *fs_info,
 508                      struct extent_io_tree *failure_tree,
 509                      struct extent_io_tree *io_tree, u64 start,
 510                      struct page *page, u64 ino, unsigned int pg_offset);
 511 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 512 int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
 513                          struct extent_buffer *eb, int mirror_num);
 514
 515 /*
 516  * When IO fails, either with EIO or csum verification fails, we
 517  * try other mirrors that might have a good copy of the data.  This
 518  * io_failure_record is used to record state as we go through all the
 519  * mirrors.  If another mirror has good data, the page is set up to date
 520  * and things continue.  If a good mirror can't be found, the original
 521  * bio end_io callback is called to indicate things have failed.
 522  */
 523 struct io_failure_record {
 524         struct page *page;
 525         u64 start;
 526         u64 len;
 527         u64 logical;
 528         unsigned long bio_flags;
 529         int this_mirror;
 530         int failed_mirror;
 531         int in_validation;
 532 };
 533
 534
 535 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
 536                 u64 end);
 537 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
 538                                 struct io_failure_record **failrec_ret);
 539 bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages,
 540                             struct io_failure_record *failrec, int fail_mirror);
 541 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
 542                                     struct io_failure_record *failrec,
 543                                     struct page *page, int pg_offset, int icsum,
 544                                     bio_end_io_t *endio_func, void *data);
 545 int free_io_failure(struct extent_io_tree *failure_tree,
 546                     struct extent_io_tree *io_tree,
 547                     struct io_failure_record *rec);
 548 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 549 u64 btrfs_find_lock_delalloc_range(struct inode *inode,
 550                                       struct extent_io_tree *tree,
 551                                       struct page *locked_page, u64 *start,
 552                                       u64 *end, u64 max_bytes);
 553 #endif
 554 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
 555                                                u64 start);
 556
 557 #endif