disk-io.h 5.8 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * Copyright (C) 2007 Oracle. All rights reserved.
  4. */
  5. #ifndef BTRFS_DISK_IO_H
  6. #define BTRFS_DISK_IO_H
  7. #define BTRFS_SUPER_INFO_OFFSET SZ_64K
  8. #define BTRFS_SUPER_INFO_SIZE 4096
  9. #define BTRFS_SUPER_MIRROR_MAX 3
  10. #define BTRFS_SUPER_MIRROR_SHIFT 12
  11. /*
  12. * Fixed blocksize for all devices, applies to specific ways of reading
  13. * metadata like superblock. Must meet the set_blocksize requirements.
  14. *
  15. * Do not change.
  16. */
  17. #define BTRFS_BDEV_BLOCKSIZE (4096)
  18. enum btrfs_wq_endio_type {
  19. BTRFS_WQ_ENDIO_DATA = 0,
  20. BTRFS_WQ_ENDIO_METADATA = 1,
  21. BTRFS_WQ_ENDIO_FREE_SPACE = 2,
  22. BTRFS_WQ_ENDIO_RAID56 = 3,
  23. BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
  24. };
  25. static inline u64 btrfs_sb_offset(int mirror)
  26. {
  27. u64 start = SZ_16K;
  28. if (mirror)
  29. return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
  30. return BTRFS_SUPER_INFO_OFFSET;
  31. }
  32. struct btrfs_device;
  33. struct btrfs_fs_devices;
  34. int btrfs_verify_level_key(struct btrfs_fs_info *fs_info,
  35. struct extent_buffer *eb, int level,
  36. struct btrfs_key *first_key, u64 parent_transid);
  37. struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
  38. u64 parent_transid, int level,
  39. struct btrfs_key *first_key);
  40. void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
  41. int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
  42. int mirror_num, struct extent_buffer **eb);
  43. struct extent_buffer *btrfs_find_create_tree_block(
  44. struct btrfs_fs_info *fs_info,
  45. u64 bytenr);
  46. void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
  47. int open_ctree(struct super_block *sb,
  48. struct btrfs_fs_devices *fs_devices,
  49. char *options);
  50. void close_ctree(struct btrfs_fs_info *fs_info);
  51. int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
  52. struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
  53. int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
  54. struct buffer_head **bh_ret);
  55. int btrfs_commit_super(struct btrfs_fs_info *fs_info);
  56. struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
  57. struct btrfs_key *location);
  58. int btrfs_init_fs_root(struct btrfs_root *root);
  59. struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
  60. u64 root_id);
  61. int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
  62. struct btrfs_root *root);
  63. void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
  64. struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
  65. struct btrfs_key *key,
  66. bool check_ref);
  67. static inline struct btrfs_root *
  68. btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
  69. struct btrfs_key *location)
  70. {
  71. return btrfs_get_fs_root(fs_info, location, true);
  72. }
  73. int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
  74. void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
  75. void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
  76. void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
  77. struct btrfs_root *root);
  78. void btrfs_free_fs_root(struct btrfs_root *root);
  79. #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  80. struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
  81. #endif
  82. /*
  83. * This function is used to grab the root, and avoid it is freed when we
  84. * access it. But it doesn't ensure that the tree is not dropped.
  85. *
  86. * If you want to ensure the whole tree is safe, you should use
  87. * fs_info->subvol_srcu
  88. */
  89. static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
  90. {
  91. if (refcount_inc_not_zero(&root->refs))
  92. return root;
  93. return NULL;
  94. }
  95. static inline void btrfs_put_fs_root(struct btrfs_root *root)
  96. {
  97. if (refcount_dec_and_test(&root->refs))
  98. kfree(root);
  99. }
  100. void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  101. int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
  102. int atomic);
  103. int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
  104. struct btrfs_key *first_key);
  105. u32 btrfs_csum_data(const char *data, u32 seed, size_t len);
  106. void btrfs_csum_final(u32 crc, u8 *result);
  107. blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
  108. enum btrfs_wq_endio_type metadata);
  109. blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
  110. int mirror_num, unsigned long bio_flags,
  111. u64 bio_offset, void *private_data,
  112. extent_submit_bio_start_t *submit_bio_start);
  113. blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
  114. int mirror_num);
  115. int btrfs_write_tree_block(struct extent_buffer *buf);
  116. void btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
  117. int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
  118. struct btrfs_fs_info *fs_info);
  119. int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
  120. struct btrfs_root *root);
  121. void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
  122. struct btrfs_fs_info *fs_info);
  123. void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
  124. struct btrfs_fs_info *fs_info);
  125. struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
  126. struct btrfs_fs_info *fs_info,
  127. u64 objectid);
  128. int btree_lock_page_hook(struct page *page, void *data,
  129. void (*flush_fn)(void *));
  130. struct extent_map *btree_get_extent(struct btrfs_inode *inode,
  131. struct page *page, size_t pg_offset, u64 start, u64 len,
  132. int create);
  133. int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
  134. int __init btrfs_end_io_wq_init(void);
  135. void __cold btrfs_end_io_wq_exit(void);
  136. #ifdef CONFIG_DEBUG_LOCK_ALLOC
  137. void btrfs_init_lockdep(void);
  138. void btrfs_set_buffer_lockdep_class(u64 objectid,
  139. struct extent_buffer *eb, int level);
  140. #else
  141. static inline void btrfs_init_lockdep(void)
  142. { }
  143. static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
  144. struct extent_buffer *eb, int level)
  145. {
  146. }
  147. #endif
  148. #endif