fs/btrfs/extent_io.h

   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 (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 118         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 119                                       struct extent_state *state, int uptodate);
 120         void (*set_bit_hook)(void *private_data, struct extent_state *state,
 121                              unsigned *bits);
 122         void (*clear_bit_hook)(void *private_data,
 123                         struct extent_state *state,
 124                         unsigned *bits);
 125         void (*merge_extent_hook)(void *private_data,
 126                                   struct extent_state *new,
 127                                   struct extent_state *other);
 128         void (*split_extent_hook)(void *private_data,
 129                                   struct extent_state *orig, u64 split);
 130         void (*check_extent_io_range)(void *private_data, const char *caller,
 131                                       u64 start, u64 end);
 132 };
 133
 134 struct extent_io_tree {
 135         struct rb_root state;
 136         void *private_data;
 137         u64 dirty_bytes;
 138         int track_uptodate;
 139         spinlock_t lock;
 140         const struct extent_io_ops *ops;
 141 };
 142
 143 struct extent_state {
 144         u64 start;
 145         u64 end; /* inclusive */
 146         struct rb_node rb_node;
 147
 148         /* ADD NEW ELEMENTS AFTER THIS */
 149         wait_queue_head_t wq;
 150         refcount_t refs;
 151         unsigned state;
 152
 153         struct io_failure_record *failrec;
 154
 155 #ifdef CONFIG_BTRFS_DEBUG
 156         struct list_head leak_list;
 157 #endif
 158 };
 159
 160 #define INLINE_EXTENT_BUFFER_PAGES 16
 161 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
 162 struct extent_buffer {
 163         u64 start;
 164         unsigned long len;
 165         unsigned long bflags;
 166         struct btrfs_fs_info *fs_info;
 167         spinlock_t refs_lock;
 168         atomic_t refs;
 169         atomic_t io_pages;
 170         int read_mirror;
 171         struct rcu_head rcu_head;
 172         pid_t lock_owner;
 173
 174         /* count of read lock holders on the extent buffer */
 175         atomic_t write_locks;
 176         atomic_t read_locks;
 177         atomic_t blocking_writers;
 178         atomic_t blocking_readers;
 179         atomic_t spinning_readers;
 180         atomic_t spinning_writers;
 181         short lock_nested;
 182         /* >= 0 if eb belongs to a log tree, -1 otherwise */
 183         short log_index;
 184
 185         /* protects write locks */
 186         rwlock_t lock;
 187
 188         /* readers use lock_wq while they wait for the write
 189          * lock holders to unlock
 190          */
 191         wait_queue_head_t write_lock_wq;
 192
 193         /* writers use read_lock_wq while they wait for readers
 194          * to unlock
 195          */
 196         wait_queue_head_t read_lock_wq;
 197         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 198 #ifdef CONFIG_BTRFS_DEBUG
 199         struct list_head leak_list;
 200 #endif
 201 };
 202
 203 /*
 204  * Structure to record how many bytes and which ranges are set/cleared
 205  */
 206 struct extent_changeset {
 207         /* How many bytes are set/cleared in this operation */
 208         unsigned int bytes_changed;
 209
 210         /* Changed ranges */
 211         struct ulist range_changed;
 212 };
 213
 214 static inline void extent_changeset_init(struct extent_changeset *changeset)
 215 {
 216         changeset->bytes_changed = 0;
 217         ulist_init(&changeset->range_changed);
 218 }
 219
 220 static inline struct extent_changeset *extent_changeset_alloc(void)
 221 {
 222         struct extent_changeset *ret;
 223
 224         ret = kmalloc(sizeof(*ret), GFP_KERNEL);
 225         if (!ret)
 226                 return NULL;
 227
 228         extent_changeset_init(ret);
 229         return ret;
 230 }
 231
 232 static inline void extent_changeset_release(struct extent_changeset *changeset)
 233 {
 234         if (!changeset)
 235                 return;
 236         changeset->bytes_changed = 0;
 237         ulist_release(&changeset->range_changed);
 238 }
 239
 240 static inline void extent_changeset_free(struct extent_changeset *changeset)
 241 {
 242         if (!changeset)
 243                 return;
 244         extent_changeset_release(changeset);
 245         kfree(changeset);
 246 }
 247
 248 static inline void extent_set_compress_type(unsigned long *bio_flags,
 249                                             int compress_type)
 250 {
 251         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 252 }
 253
 254 static inline int extent_compress_type(unsigned long bio_flags)
 255 {
 256         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 257 }
 258
 259 struct extent_map_tree;
 260
 261 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
 262                                           struct page *page,
 263                                           size_t pg_offset,
 264                                           u64 start, u64 len,
 265                                           int create);
 266
 267 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data);
 268 int try_release_extent_mapping(struct extent_map_tree *map,
 269                                struct extent_io_tree *tree, struct page *page,
 270                                gfp_t mask);
 271 int try_release_extent_buffer(struct page *page);
 272 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 273                      struct extent_state **cached);
 274
 275 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
 276 {
 277         return lock_extent_bits(tree, start, end, NULL);
 278 }
 279
 280 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 281 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 282                           get_extent_t *get_extent, int mirror_num);
 283 int __init extent_io_init(void);
 284 void extent_io_exit(void);
 285
 286 u64 count_range_bits(struct extent_io_tree *tree,
 287                      u64 *start, u64 search_end,
 288                      u64 max_bytes, unsigned bits, int contig);
 289
 290 void free_extent_state(struct extent_state *state);
 291 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 292                    unsigned bits, int filled,
 293                    struct extent_state *cached_state);
 294 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 295                 unsigned bits, struct extent_changeset *changeset);
 296 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 297                      unsigned bits, int wake, int delete,
 298                      struct extent_state **cached, gfp_t mask);
 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                                 GFP_NOFS);
 304 }
 305
 306 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
 307                 u64 end, struct extent_state **cached, gfp_t mask)
 308 {
 309         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
 310                                 mask);
 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                         GFP_NOFS);
 323 }
 324
 325 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 326                            unsigned bits, struct extent_changeset *changeset);
 327 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 328                    unsigned bits, u64 *failed_start,
 329                    struct extent_state **cached_state, gfp_t mask);
 330
 331 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
 332                 u64 end, unsigned bits)
 333 {
 334         return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
 335 }
 336
 337 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
 338                 u64 end, struct extent_state **cached_state, gfp_t mask)
 339 {
 340         return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
 341                                 cached_state, mask);
 342 }
 343
 344 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
 345                 u64 end, gfp_t mask)
 346 {
 347         return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
 348                               NULL, mask);
 349 }
 350
 351 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
 352                                      u64 end, struct extent_state **cached)
 353 {
 354         return clear_extent_bit(tree, start, end,
 355                                 EXTENT_DIRTY | EXTENT_DELALLOC |
 356                                 EXTENT_DO_ACCOUNTING, 0, 0, cached, GFP_NOFS);
 357 }
 358
 359 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 360                        unsigned bits, unsigned clear_bits,
 361                        struct extent_state **cached_state);
 362
 363 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
 364                                       u64 end, unsigned int extra_bits,
 365                                       struct extent_state **cached_state)
 366 {
 367         return set_extent_bit(tree, start, end,
 368                               EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
 369                               NULL, cached_state, GFP_NOFS);
 370 }
 371
 372 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
 373                 u64 end, struct extent_state **cached_state)
 374 {
 375         return set_extent_bit(tree, start, end,
 376                               EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
 377                               NULL, cached_state, GFP_NOFS);
 378 }
 379
 380 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
 381                 u64 end)
 382 {
 383         return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
 384                         GFP_NOFS);
 385 }
 386
 387 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
 388                 u64 end, struct extent_state **cached_state, gfp_t mask)
 389 {
 390         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
 391                               cached_state, mask);
 392 }
 393
 394 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 395                           u64 *start_ret, u64 *end_ret, unsigned bits,
 396                           struct extent_state **cached_state);
 397 int extent_invalidatepage(struct extent_io_tree *tree,
 398                           struct page *page, unsigned long offset);
 399 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 400                           get_extent_t *get_extent,
 401                           struct writeback_control *wbc);
 402 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 403                               u64 start, u64 end, get_extent_t *get_extent,
 404                               int mode);
 405 int extent_writepages(struct extent_io_tree *tree,
 406                       struct address_space *mapping,
 407                       get_extent_t *get_extent,
 408                       struct writeback_control *wbc);
 409 int btree_write_cache_pages(struct address_space *mapping,
 410                             struct writeback_control *wbc);
 411 int extent_readpages(struct extent_io_tree *tree,
 412                      struct address_space *mapping,
 413                      struct list_head *pages, unsigned nr_pages,
 414                      get_extent_t get_extent);
 415 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 416                 __u64 start, __u64 len, get_extent_t *get_extent);
 417 void set_page_extent_mapped(struct page *page);
 418
 419 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 420                                           u64 start);
 421 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 422                                                   u64 start, unsigned long len);
 423 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 424                                                 u64 start);
 425 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 426 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
 427                                          u64 start);
 428 void free_extent_buffer(struct extent_buffer *eb);
 429 void free_extent_buffer_stale(struct extent_buffer *eb);
 430 #define WAIT_NONE       0
 431 #define WAIT_COMPLETE   1
 432 #define WAIT_PAGE_LOCK  2
 433 int read_extent_buffer_pages(struct extent_io_tree *tree,
 434                              struct extent_buffer *eb, int wait,
 435                              get_extent_t *get_extent, int mirror_num);
 436 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 437
 438 static inline unsigned long num_extent_pages(u64 start, u64 len)
 439 {
 440         return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
 441                 (start >> PAGE_SHIFT);
 442 }
 443
 444 static inline void extent_buffer_get(struct extent_buffer *eb)
 445 {
 446         atomic_inc(&eb->refs);
 447 }
 448
 449 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
 450                          unsigned long start, unsigned long len);
 451 void read_extent_buffer(const struct extent_buffer *eb, void *dst,
 452                         unsigned long start,
 453                         unsigned long len);
 454 int read_extent_buffer_to_user(const struct extent_buffer *eb,
 455                                void __user *dst, unsigned long start,
 456                                unsigned long len);
 457 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
 458 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
 459                 const void *src);
 460 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 461                          unsigned long start, unsigned long len);
 462 void copy_extent_buffer_full(struct extent_buffer *dst,
 463                              struct extent_buffer *src);
 464 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 465                         unsigned long dst_offset, unsigned long src_offset,
 466                         unsigned long len);
 467 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 468                            unsigned long src_offset, unsigned long len);
 469 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 470                            unsigned long src_offset, unsigned long len);
 471 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
 472                            unsigned long len);
 473 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
 474                            unsigned long pos);
 475 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 476                               unsigned long pos, unsigned long len);
 477 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 478                                 unsigned long pos, unsigned long len);
 479 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 480 int set_extent_buffer_dirty(struct extent_buffer *eb);
 481 void set_extent_buffer_uptodate(struct extent_buffer *eb);
 482 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
 483 int extent_buffer_uptodate(struct extent_buffer *eb);
 484 int extent_buffer_under_io(struct extent_buffer *eb);
 485 int map_private_extent_buffer(const struct extent_buffer *eb,
 486                               unsigned long offset, unsigned long min_len,
 487                               char **map, unsigned long *map_start,
 488                               unsigned long *map_len);
 489 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 490 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 491 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
 492                                  u64 delalloc_end, struct page *locked_page,
 493                                  unsigned bits_to_clear,
 494                                  unsigned long page_ops);
 495 struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte);
 496 struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
 497 struct bio *btrfs_bio_clone(struct bio *bio);
 498 struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
 499
 500 struct btrfs_fs_info;
 501 struct btrfs_inode;
 502
 503 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
 504                       u64 length, u64 logical, struct page *page,
 505                       unsigned int pg_offset, int mirror_num);
 506 int clean_io_failure(struct btrfs_fs_info *fs_info,
 507                      struct extent_io_tree *failure_tree,
 508                      struct extent_io_tree *io_tree, u64 start,
 509                      struct page *page, u64 ino, unsigned int pg_offset);
 510 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 511 int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
 512                          struct extent_buffer *eb, int mirror_num);
 513
 514 /*
 515  * When IO fails, either with EIO or csum verification fails, we
 516  * try other mirrors that might have a good copy of the data.  This
 517  * io_failure_record is used to record state as we go through all the
 518  * mirrors.  If another mirror has good data, the page is set up to date
 519  * and things continue.  If a good mirror can't be found, the original
 520  * bio end_io callback is called to indicate things have failed.
 521  */
 522 struct io_failure_record {
 523         struct page *page;
 524         u64 start;
 525         u64 len;
 526         u64 logical;
 527         unsigned long bio_flags;
 528         int this_mirror;
 529         int failed_mirror;
 530         int in_validation;
 531 };
 532
 533
 534 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
 535                 u64 end);
 536 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
 537                                 struct io_failure_record **failrec_ret);
 538 bool btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
 539                             struct io_failure_record *failrec, int fail_mirror);
 540 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
 541                                     struct io_failure_record *failrec,
 542                                     struct page *page, int pg_offset, int icsum,
 543                                     bio_end_io_t *endio_func, void *data);
 544 int free_io_failure(struct extent_io_tree *failure_tree,
 545                     struct extent_io_tree *io_tree,
 546                     struct io_failure_record *rec);
 547 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 548 noinline u64 find_lock_delalloc_range(struct inode *inode,
 549                                       struct extent_io_tree *tree,
 550                                       struct page *locked_page, u64 *start,
 551                                       u64 *end, u64 max_bytes);
 552 #endif
 553 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
 554                                                u64 start);
 555 #endif