1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_DISK_IO_H 7 #define BTRFS_DISK_IO_H 8 9 #define BTRFS_SUPER_MIRROR_MAX 3 10 #define BTRFS_SUPER_MIRROR_SHIFT 12 11 12 /* 13 * Fixed blocksize for all devices, applies to specific ways of reading 14 * metadata like superblock. Must meet the set_blocksize requirements. 15 * 16 * Do not change. 17 */ 18 #define BTRFS_BDEV_BLOCKSIZE (4096) 19 20 static inline u64 btrfs_sb_offset(int mirror) 21 { 22 u64 start = SZ_16K; 23 if (mirror) 24 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); 25 return BTRFS_SUPER_INFO_OFFSET; 26 } 27 28 struct btrfs_device; 29 struct btrfs_fs_devices; 30 struct btrfs_tree_parent_check; 31 32 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); 33 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); 34 int btrfs_verify_level_key(struct extent_buffer *eb, int level, 35 struct btrfs_key *first_key, u64 parent_transid); 36 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, 37 struct btrfs_tree_parent_check *check); 38 struct extent_buffer *btrfs_find_create_tree_block( 39 struct btrfs_fs_info *fs_info, 40 u64 bytenr, u64 owner_root, 41 int level); 42 void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans, 43 struct extent_buffer *buf); 44 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); 45 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 46 int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, 47 const struct btrfs_super_block *disk_sb); 48 int __cold open_ctree(struct super_block *sb, 49 struct btrfs_fs_devices *fs_devices, 50 char *options); 51 void __cold close_ctree(struct btrfs_fs_info *fs_info); 52 int btrfs_validate_super(struct btrfs_fs_info *fs_info, 53 struct btrfs_super_block *sb, int mirror_num); 54 int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount); 55 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 56 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 57 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 58 int copy_num, bool drop_cache); 59 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 60 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 61 struct btrfs_key *key); 62 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 63 struct btrfs_root *root); 64 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 65 66 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 67 u64 objectid, bool check_ref); 68 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 69 u64 objectid, dev_t anon_dev); 70 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 71 struct btrfs_path *path, 72 u64 objectid); 73 int btrfs_global_root_insert(struct btrfs_root *root); 74 void btrfs_global_root_delete(struct btrfs_root *root); 75 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, 76 struct btrfs_key *key); 77 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); 78 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); 79 struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info); 80 81 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 82 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 83 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 84 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 85 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 86 struct btrfs_root *root); 87 int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio, 88 struct page *page, u64 start, u64 end, 89 int mirror); 90 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 91 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 92 #endif 93 94 /* 95 * This function is used to grab the root, and avoid it is freed when we 96 * access it. But it doesn't ensure that the tree is not dropped. 97 * 98 * If you want to ensure the whole tree is safe, you should use 99 * fs_info->subvol_srcu 100 */ 101 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 102 { 103 if (!root) 104 return NULL; 105 if (refcount_inc_not_zero(&root->refs)) 106 return root; 107 return NULL; 108 } 109 110 void btrfs_put_root(struct btrfs_root *root); 111 void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 112 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 113 int atomic); 114 int btrfs_read_extent_buffer(struct extent_buffer *buf, 115 struct btrfs_tree_parent_check *check); 116 117 blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio); 118 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, 119 struct btrfs_root *root); 120 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 121 struct btrfs_fs_info *fs_info); 122 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 123 struct btrfs_root *root); 124 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 125 struct btrfs_fs_info *fs_info); 126 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 127 struct btrfs_fs_info *fs_info); 128 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 129 u64 objectid); 130 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 131 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 132 int btrfs_init_root_free_objectid(struct btrfs_root *root); 133 134 #endif 135