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 #include <linux/sizes.h> 10 #include <linux/compiler_types.h> 11 #include "ctree.h" 12 #include "bio.h" 13 #include "ordered-data.h" 14 15 struct block_device; 16 struct super_block; 17 struct extent_buffer; 18 struct btrfs_device; 19 struct btrfs_fs_devices; 20 struct btrfs_fs_info; 21 struct btrfs_super_block; 22 struct btrfs_trans_handle; 23 struct btrfs_tree_parent_check; 24 struct btrfs_transaction; 25 26 #define BTRFS_SUPER_MIRROR_MAX 3 27 #define BTRFS_SUPER_MIRROR_SHIFT 12 28 29 /* 30 * Fixed blocksize for all devices, applies to specific ways of reading 31 * metadata like superblock. Must meet the set_blocksize requirements. 32 * 33 * Do not change. 34 */ 35 #define BTRFS_BDEV_BLOCKSIZE (4096) 36 37 static inline u64 btrfs_sb_offset(int mirror) 38 { 39 u64 start = SZ_16K; 40 if (mirror) 41 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); 42 return BTRFS_SUPER_INFO_OFFSET; 43 } 44 45 void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info); 46 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); 47 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, 48 struct btrfs_tree_parent_check *check); 49 struct extent_buffer *btrfs_find_create_tree_block( 50 struct btrfs_fs_info *fs_info, 51 u64 bytenr, u64 owner_root, 52 int level); 53 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 54 int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, 55 const struct btrfs_super_block *disk_sb); 56 int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices); 57 void __cold close_ctree(struct btrfs_fs_info *fs_info); 58 int btrfs_validate_super(const struct btrfs_fs_info *fs_info, 59 const struct btrfs_super_block *sb, int mirror_num); 60 int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount); 61 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 62 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 63 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 64 const struct btrfs_key *key); 65 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 66 struct btrfs_root *root); 67 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 68 69 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 70 u64 objectid, bool check_ref); 71 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 72 u64 objectid, dev_t *anon_dev); 73 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 74 struct btrfs_path *path, 75 u64 objectid); 76 int btrfs_global_root_insert(struct btrfs_root *root); 77 void btrfs_global_root_delete(struct btrfs_root *root); 78 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, 79 struct btrfs_key *key); 80 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); 81 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); 82 83 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 84 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 85 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 86 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 87 struct btrfs_root *root); 88 int btrfs_validate_extent_buffer(struct extent_buffer *eb, 89 const struct btrfs_tree_parent_check *check); 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 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 99 { 100 if (!root) 101 return NULL; 102 if (refcount_inc_not_zero(&root->refs)) 103 return root; 104 return NULL; 105 } 106 107 void btrfs_put_root(struct btrfs_root *root); 108 void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans, 109 struct extent_buffer *buf); 110 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, bool atomic); 111 int btrfs_read_extent_buffer(struct extent_buffer *buf, 112 const struct btrfs_tree_parent_check *check); 113 114 int 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_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 125 u64 objectid); 126 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 127 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 128 int btrfs_init_root_free_objectid(struct btrfs_root *root); 129 130 #endif 131