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 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, 35 struct btrfs_tree_parent_check *check); 36 struct extent_buffer *btrfs_find_create_tree_block( 37 struct btrfs_fs_info *fs_info, 38 u64 bytenr, u64 owner_root, 39 int level); 40 void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans, 41 struct extent_buffer *buf); 42 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); 43 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 44 int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, 45 const struct btrfs_super_block *disk_sb); 46 int __cold open_ctree(struct super_block *sb, 47 struct btrfs_fs_devices *fs_devices, 48 char *options); 49 void __cold close_ctree(struct btrfs_fs_info *fs_info); 50 int btrfs_validate_super(struct btrfs_fs_info *fs_info, 51 struct btrfs_super_block *sb, int mirror_num); 52 int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount); 53 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 54 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 55 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 56 int copy_num, bool drop_cache); 57 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 58 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 59 struct btrfs_key *key); 60 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 61 struct btrfs_root *root); 62 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 63 64 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 65 u64 objectid, bool check_ref); 66 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 67 u64 objectid, dev_t *anon_dev); 68 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 69 struct btrfs_path *path, 70 u64 objectid); 71 int btrfs_global_root_insert(struct btrfs_root *root); 72 void btrfs_global_root_delete(struct btrfs_root *root); 73 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, 74 struct btrfs_key *key); 75 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); 76 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); 77 struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info); 78 79 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 80 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 81 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 82 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 83 struct btrfs_root *root); 84 int btrfs_validate_extent_buffer(struct extent_buffer *eb, 85 struct btrfs_tree_parent_check *check); 86 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 87 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 88 #endif 89 90 /* 91 * This function is used to grab the root, and avoid it is freed when we 92 * access it. But it doesn't ensure that the tree is not dropped. 93 * 94 * If you want to ensure the whole tree is safe, you should use 95 * fs_info->subvol_srcu 96 */ 97 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 98 { 99 if (!root) 100 return NULL; 101 if (refcount_inc_not_zero(&root->refs)) 102 return root; 103 return NULL; 104 } 105 106 void btrfs_put_root(struct btrfs_root *root); 107 void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans, 108 struct extent_buffer *buf); 109 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 110 int atomic); 111 int btrfs_read_extent_buffer(struct extent_buffer *buf, 112 struct btrfs_tree_parent_check *check); 113 114 blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio); 115 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, 116 struct btrfs_root *root); 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 u64 objectid); 127 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 128 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 129 int btrfs_init_root_free_objectid(struct btrfs_root *root); 130 131 #endif 132