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 (*fill_delalloc)(void *private_data, struct page *locked_page,
 118                              u64 start, u64 end, int *page_started,
 119                              unsigned long *nr_written,
 120                              struct writeback_control *wbc);
 121
 122         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
 123         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 124                                       struct extent_state *state, int uptodate);
 125         void (*set_bit_hook)(void *private_data, struct extent_state *state,
 126                              unsigned *bits);
 127         void (*clear_bit_hook)(void *private_data,
 128                         struct extent_state *state,
 129                         unsigned *bits);
 130         void (*merge_extent_hook)(void *private_data,
 131                                   struct extent_state *new,
 132                                   struct extent_state *other);
 133         void (*split_extent_hook)(void *private_data,
 134                                   struct extent_state *orig, u64 split);
 135         void (*check_extent_io_range)(void *private_data, const char *caller,
 136                                       u64 start, u64 end);
 137 };
 138
 139 struct extent_io_tree {
 140         struct rb_root state;
 141         void *private_data;
 142         u64 dirty_bytes;
 143         int track_uptodate;
 144         spinlock_t lock;
 145         const struct extent_io_ops *ops;
 146 };
 147
 148 struct extent_state {
 149         u64 start;
 150         u64 end; /* inclusive */
 151         struct rb_node rb_node;
 152
 153         /* ADD NEW ELEMENTS AFTER THIS */
 154         wait_queue_head_t wq;
 155         refcount_t refs;
 156         unsigned state;
 157
 158         struct io_failure_record *failrec;
 159
 160 #ifdef CONFIG_BTRFS_DEBUG
 161         struct list_head leak_list;
 162 #endif
 163 };
 164
 165 #define INLINE_EXTENT_BUFFER_PAGES 16
 166 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
 167 struct extent_buffer {
 168         u64 start;
 169         unsigned long len;
 170         unsigned long bflags;
 171         struct btrfs_fs_info *fs_info;
 172         spinlock_t refs_lock;
 173         atomic_t refs;
 174         atomic_t io_pages;
 175         int read_mirror;
 176         struct rcu_head rcu_head;
 177         pid_t lock_owner;
 178
 179         /* count of read lock holders on the extent buffer */
 180         atomic_t write_locks;
 181         atomic_t read_locks;
 182         atomic_t blocking_writers;
 183         atomic_t blocking_readers;
 184         atomic_t spinning_readers;
 185         atomic_t spinning_writers;
 186         short lock_nested;
 187         /* >= 0 if eb belongs to a log tree, -1 otherwise */
 188         short log_index;
 189
 190         /* protects write locks */
 191         rwlock_t lock;
 192
 193         /* readers use lock_wq while they wait for the write
 194          * lock holders to unlock
 195          */
 196         wait_queue_head_t write_lock_wq;
 197
 198         /* writers use read_lock_wq while they wait for readers
 199          * to unlock
 200          */
 201         wait_queue_head_t read_lock_wq;
 202         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 203 #ifdef CONFIG_BTRFS_DEBUG
 204         struct list_head leak_list;
 205 #endif
 206 };
 207
 208 /*
 209  * Structure to record how many bytes and which ranges are set/cleared
 210  */
 211 struct extent_changeset {
 212         /* How many bytes are set/cleared in this operation */
 213         unsigned int bytes_changed;
 214
 215         /* Changed ranges */
 216         struct ulist range_changed;
 217 };
 218
 219 static inline void extent_changeset_init(struct extent_changeset *changeset)
 220 {
 221         changeset->bytes_changed = 0;
 222         ulist_init(&changeset->range_changed);
 223 }
 224
 225 static inline struct extent_changeset *extent_changeset_alloc(void)
 226 {
 227         struct extent_changeset *ret;
 228
 229         ret = kmalloc(sizeof(*ret), GFP_KERNEL);
 230         if (!ret)
 231                 return NULL;
 232
 233         extent_changeset_init(ret);
 234         return ret;
 235 }
 236
 237 static inline void extent_changeset_release(struct extent_changeset *changeset)
 238 {
 239         if (!changeset)
 240                 return;
 241         changeset->bytes_changed = 0;
 242         ulist_release(&changeset->range_changed);
 243 }
 244
 245 static inline void extent_changeset_free(struct extent_changeset *changeset)
 246 {
 247         if (!changeset)
 248                 return;
 249         extent_changeset_release(changeset);
 250         kfree(changeset);
 251 }
 252
 253 static inline void extent_set_compress_type(unsigned long *bio_flags,
 254                                             int compress_type)
 255 {
 256         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 257 }
 258
 259 static inline int extent_compress_type(unsigned long bio_flags)
 260 {
 261         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 262 }
 263
 264 struct extent_map_tree;
 265
 266 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
 267                                           struct page *page,
 268                                           size_t pg_offset,
 269                                           u64 start, u64 len,
 270                                           int create);
 271
 272 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data);
 273 int try_release_extent_mapping(struct extent_map_tree *map,
 274                                struct extent_io_tree *tree, struct page *page,
 275                                gfp_t mask);
 276 int try_release_extent_buffer(struct page *page);
 277 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 278                      struct extent_state **cached);
 279
 280 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
 281 {
 282         return lock_extent_bits(tree, start, end, NULL);
 283 }
 284
 285 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 286 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 287                           get_extent_t *get_extent, int mirror_num);
 288 int __init extent_io_init(void);
 289 void extent_io_exit(void);
 290
 291 u64 count_range_bits(struct extent_io_tree *tree,
 292                      u64 *start, u64 search_end,
 293                      u64 max_bytes, unsigned bits, int contig);
 294
 295 void free_extent_state(struct extent_state *state);
 296 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 297                    unsigned bits, int filled,
 298                    struct extent_state *cached_state);
 299 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 300                 unsigned bits, struct extent_changeset *changeset);
 301 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 302                      unsigned bits, int wake, int delete,
 303                      struct extent_state **cached, gfp_t mask);
 304
 305 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
 306 {
 307         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
 308                                 GFP_NOFS);
 309 }
 310
 311 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
 312                 u64 end, struct extent_state **cached, gfp_t mask)
 313 {
 314         return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
 315                                 mask);
 316 }
 317
 318 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
 319                 u64 end, unsigned bits)
 320 {
 321         int wake = 0;
 322
 323         if (bits & EXTENT_LOCKED)
 324                 wake = 1;
 325
 326         return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
 327                         GFP_NOFS);
 328 }
 329
 330 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 331                            unsigned bits, struct extent_changeset *changeset);
 332 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 333                    unsigned bits, u64 *failed_start,
 334                    struct extent_state **cached_state, gfp_t mask);
 335
 336 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
 337                 u64 end, unsigned bits)
 338 {
 339         return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
 340 }
 341
 342 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
 343                 u64 end, struct extent_state **cached_state, gfp_t mask)
 344 {
 345         return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
 346                                 cached_state, mask);
 347 }
 348
 349 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
 350                 u64 end, gfp_t mask)
 351 {
 352         return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
 353                               NULL, mask);
 354 }
 355
 356 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
 357                 u64 end)
 358 {
 359         return clear_extent_bit(tree, start, end,
 360                                 EXTENT_DIRTY | EXTENT_DELALLOC |
 361                                 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
 362 }
 363
 364 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 365                        unsigned bits, unsigned clear_bits,
 366                        struct extent_state **cached_state);
 367
 368 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
 369                                       u64 end, unsigned int extra_bits,
 370                                       struct extent_state **cached_state)
 371 {
 372         return set_extent_bit(tree, start, end,
 373                               EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits,
 374                               NULL, cached_state, GFP_NOFS);
 375 }
 376
 377 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
 378                 u64 end, struct extent_state **cached_state)
 379 {
 380         return set_extent_bit(tree, start, end,
 381                               EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
 382                               NULL, cached_state, GFP_NOFS);
 383 }
 384
 385 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
 386                 u64 end)
 387 {
 388         return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
 389                         GFP_NOFS);
 390 }
 391
 392 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
 393                 u64 end, struct extent_state **cached_state, gfp_t mask)
 394 {
 395         return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
 396                               cached_state, mask);
 397 }
 398
 399 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 400                           u64 *start_ret, u64 *end_ret, unsigned bits,
 401                           struct extent_state **cached_state);
 402 int extent_invalidatepage(struct extent_io_tree *tree,
 403                           struct page *page, unsigned long offset);
 404 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 405                           get_extent_t *get_extent,
 406                           struct writeback_control *wbc);
 407 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 408                               u64 start, u64 end, get_extent_t *get_extent,
 409                               int mode);
 410 int extent_writepages(struct extent_io_tree *tree,
 411                       struct address_space *mapping,
 412                       get_extent_t *get_extent,
 413                       struct writeback_control *wbc);
 414 int btree_write_cache_pages(struct address_space *mapping,
 415                             struct writeback_control *wbc);
 416 int extent_readpages(struct extent_io_tree *tree,
 417                      struct address_space *mapping,
 418                      struct list_head *pages, unsigned nr_pages,
 419                      get_extent_t get_extent);
 420 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 421                 __u64 start, __u64 len, get_extent_t *get_extent);
 422 void set_page_extent_mapped(struct page *page);
 423
 424 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 425                                           u64 start);
 426 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 427                                                   u64 start, unsigned long len);
 428 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
 429                                                 u64 start);
 430 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 431 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
 432                                          u64 start);
 433 void free_extent_buffer(struct extent_buffer *eb);
 434 void free_extent_buffer_stale(struct extent_buffer *eb);
 435 #define WAIT_NONE       0
 436 #define WAIT_COMPLETE   1
 437 #define WAIT_PAGE_LOCK  2
 438 int read_extent_buffer_pages(struct extent_io_tree *tree,
 439                              struct extent_buffer *eb, int wait,
 440                              get_extent_t *get_extent, int mirror_num);
 441 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 442
 443 static inline unsigned long num_extent_pages(u64 start, u64 len)
 444 {
 445         return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
 446                 (start >> PAGE_SHIFT);
 447 }
 448
 449 static inline void extent_buffer_get(struct extent_buffer *eb)
 450 {
 451         atomic_inc(&eb->refs);
 452 }
 453
 454 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
 455                          unsigned long start, unsigned long len);
 456 void read_extent_buffer(const struct extent_buffer *eb, void *dst,
 457                         unsigned long start,
 458                         unsigned long len);
 459 int read_extent_buffer_to_user(const struct extent_buffer *eb,
 460                                void __user *dst, unsigned long start,
 461                                unsigned long len);
 462 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
 463 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
 464                 const void *src);
 465 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 466                          unsigned long start, unsigned long len);
 467 void copy_extent_buffer_full(struct extent_buffer *dst,
 468                              struct extent_buffer *src);
 469 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 470                         unsigned long dst_offset, unsigned long src_offset,
 471                         unsigned long len);
 472 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 473                            unsigned long src_offset, unsigned long len);
 474 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 475                            unsigned long src_offset, unsigned long len);
 476 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
 477                            unsigned long len);
 478 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
 479                            unsigned long pos);
 480 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 481                               unsigned long pos, unsigned long len);
 482 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 483                                 unsigned long pos, unsigned long len);
 484 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 485 int set_extent_buffer_dirty(struct extent_buffer *eb);
 486 void set_extent_buffer_uptodate(struct extent_buffer *eb);
 487 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
 488 int extent_buffer_uptodate(struct extent_buffer *eb);
 489 int extent_buffer_under_io(struct extent_buffer *eb);
 490 int map_private_extent_buffer(const struct extent_buffer *eb,
 491                               unsigned long offset, unsigned long min_len,
 492                               char **map, unsigned long *map_start,
 493                               unsigned long *map_len);
 494 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 495 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 496 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
 497                                  u64 delalloc_end, struct page *locked_page,
 498                                  unsigned bits_to_clear,
 499                                  unsigned long page_ops);
 500 struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte);
 501 struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
 502 struct bio *btrfs_bio_clone(struct bio *bio);
 503 struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
 504
 505 struct btrfs_fs_info;
 506 struct btrfs_inode;
 507
 508 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
 509                       u64 length, u64 logical, struct page *page,
 510                       unsigned int pg_offset, int mirror_num);
 511 int clean_io_failure(struct btrfs_fs_info *fs_info,
 512                      struct extent_io_tree *failure_tree,
 513                      struct extent_io_tree *io_tree, u64 start,
 514                      struct page *page, u64 ino, unsigned int pg_offset);
 515 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 516 int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
 517                          struct extent_buffer *eb, int mirror_num);
 518
 519 /*
 520  * When IO fails, either with EIO or csum verification fails, we
 521  * try other mirrors that might have a good copy of the data.  This
 522  * io_failure_record is used to record state as we go through all the
 523  * mirrors.  If another mirror has good data, the page is set up to date
 524  * and things continue.  If a good mirror can't be found, the original
 525  * bio end_io callback is called to indicate things have failed.
 526  */
 527 struct io_failure_record {
 528         struct page *page;
 529         u64 start;
 530         u64 len;
 531         u64 logical;
 532         unsigned long bio_flags;
 533         int this_mirror;
 534         int failed_mirror;
 535         int in_validation;
 536 };
 537
 538
 539 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
 540                 u64 end);
 541 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
 542                                 struct io_failure_record **failrec_ret);
 543 bool btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
 544                             struct io_failure_record *failrec, int fail_mirror);
 545 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
 546                                     struct io_failure_record *failrec,
 547                                     struct page *page, int pg_offset, int icsum,
 548                                     bio_end_io_t *endio_func, void *data);
 549 int free_io_failure(struct extent_io_tree *failure_tree,
 550                     struct extent_io_tree *io_tree,
 551                     struct io_failure_record *rec);
 552 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 553 noinline u64 find_lock_delalloc_range(struct inode *inode,
 554                                       struct extent_io_tree *tree,
 555                                       struct page *locked_page, u64 *start,
 556                                       u64 *end, u64 max_bytes);
 557 #endif
 558 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
 559                                                u64 start);
 560 #endif