disk-io.h 5.4 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,
  20. BTRFS_WQ_ENDIO_METADATA,
  21. BTRFS_WQ_ENDIO_FREE_SPACE,
  22. BTRFS_WQ_ENDIO_RAID56,
  23. };
  24. static inline u64 btrfs_sb_offset(int mirror)
  25. {
  26. u64 start = SZ_16K;
  27. if (mirror)
  28. return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
  29. return BTRFS_SUPER_INFO_OFFSET;
  30. }
  31. struct btrfs_device;
  32. struct btrfs_fs_devices;
  33. void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
  34. void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
  35. int btrfs_verify_level_key(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. struct extent_buffer *btrfs_find_create_tree_block(
  42. struct btrfs_fs_info *fs_info,
  43. u64 bytenr);
  44. void btrfs_clean_tree_block(struct extent_buffer *buf);
  45. int __cold open_ctree(struct super_block *sb,
  46. struct btrfs_fs_devices *fs_devices,
  47. char *options);
  48. void __cold close_ctree(struct btrfs_fs_info *fs_info);
  49. int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
  50. struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
  51. struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
  52. int copy_num);
  53. int btrfs_commit_super(struct btrfs_fs_info *fs_info);
  54. struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
  55. struct btrfs_key *key);
  56. int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
  57. struct btrfs_root *root);
  58. void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
  59. struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
  60. u64 objectid, bool check_ref);
  61. struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
  62. u64 objectid, dev_t anon_dev);
  63. struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
  64. struct btrfs_path *path,
  65. u64 objectid);
  66. void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
  67. int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
  68. void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
  69. void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
  70. void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
  71. struct btrfs_root *root);
  72. int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset,
  73. struct page *page, u64 start, u64 end,
  74. int mirror);
  75. blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
  76. int mirror_num, unsigned long bio_flags);
  77. #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  78. struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
  79. #endif
  80. /*
  81. * This function is used to grab the root, and avoid it is freed when we
  82. * access it. But it doesn't ensure that the tree is not dropped.
  83. *
  84. * If you want to ensure the whole tree is safe, you should use
  85. * fs_info->subvol_srcu
  86. */
  87. static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
  88. {
  89. if (!root)
  90. return NULL;
  91. if (refcount_inc_not_zero(&root->refs))
  92. return root;
  93. return NULL;
  94. }
  95. void btrfs_put_root(struct btrfs_root *root);
  96. void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
  97. int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
  98. int atomic);
  99. int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
  100. struct btrfs_key *first_key);
  101. blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
  102. enum btrfs_wq_endio_type metadata);
  103. blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
  104. int mirror_num, unsigned long bio_flags,
  105. u64 bio_offset, void *private_data,
  106. extent_submit_bio_start_t *submit_bio_start);
  107. blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
  108. int mirror_num);
  109. int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
  110. struct btrfs_fs_info *fs_info);
  111. int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
  112. struct btrfs_root *root);
  113. void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
  114. struct btrfs_fs_info *fs_info);
  115. void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
  116. struct btrfs_fs_info *fs_info);
  117. struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
  118. u64 objectid);
  119. int btree_lock_page_hook(struct page *page, void *data,
  120. void (*flush_fn)(void *));
  121. int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
  122. int __init btrfs_end_io_wq_init(void);
  123. void __cold btrfs_end_io_wq_exit(void);
  124. #ifdef CONFIG_DEBUG_LOCK_ALLOC
  125. void btrfs_init_lockdep(void);
  126. void btrfs_set_buffer_lockdep_class(u64 objectid,
  127. struct extent_buffer *eb, int level);
  128. #else
  129. static inline void btrfs_init_lockdep(void)
  130. { }
  131. static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
  132. struct extent_buffer *eb, int level)
  133. {
  134. }
  135. #endif
  136. #endif