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 31 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); 32 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); 33 int btrfs_verify_level_key(struct extent_buffer *eb, int level, 34 struct btrfs_key *first_key, u64 parent_transid); 35 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, 36 u64 owner_root, u64 parent_transid, 37 int level, struct btrfs_key *first_key); 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_clean_tree_block(struct extent_buffer *buf); 43 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); 44 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 45 int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, 46 const struct btrfs_super_block *disk_sb); 47 int __cold open_ctree(struct super_block *sb, 48 struct btrfs_fs_devices *fs_devices, 49 char *options); 50 void __cold close_ctree(struct btrfs_fs_info *fs_info); 51 int btrfs_validate_super(struct btrfs_fs_info *fs_info, 52 struct btrfs_super_block *sb, int mirror_num); 53 int btrfs_check_features(struct btrfs_fs_info *fs_info, struct super_block *sb); 54 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 55 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 56 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 57 int copy_num, bool drop_cache); 58 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 59 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 60 struct btrfs_key *key); 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 65 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 66 u64 objectid, bool check_ref); 67 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 68 u64 objectid, dev_t anon_dev); 69 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 70 struct btrfs_path *path, 71 u64 objectid); 72 int btrfs_global_root_insert(struct btrfs_root *root); 73 void btrfs_global_root_delete(struct btrfs_root *root); 74 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, 75 struct btrfs_key *key); 76 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); 77 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); 78 79 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 80 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 81 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 82 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 83 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 84 struct btrfs_root *root); 85 int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio, 86 struct page *page, u64 start, u64 end, 87 int mirror); 88 void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num); 89 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 90 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 91 #endif 92 93 /* 94 * This function is used to grab the root, and avoid it is freed when we 95 * access it. But it doesn't ensure that the tree is not dropped. 96 * 97 * If you want to ensure the whole tree is safe, you should use 98 * fs_info->subvol_srcu 99 */ 100 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 101 { 102 if (!root) 103 return NULL; 104 if (refcount_inc_not_zero(&root->refs)) 105 return root; 106 return NULL; 107 } 108 109 static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info) 110 { 111 if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE)) 112 return fs_info->block_group_root; 113 return btrfs_extent_root(fs_info, 0); 114 } 115 116 void btrfs_put_root(struct btrfs_root *root); 117 void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 118 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 119 int atomic); 120 int btrfs_read_extent_buffer(struct extent_buffer *buf, u64 parent_transid, 121 int level, struct btrfs_key *first_key); 122 bool btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, int mirror_num, 123 u64 dio_file_offset, 124 extent_submit_bio_start_t *submit_bio_start); 125 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, 126 int mirror_num); 127 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, 128 struct btrfs_root *root); 129 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 130 struct btrfs_fs_info *fs_info); 131 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 132 struct btrfs_root *root); 133 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 134 struct btrfs_fs_info *fs_info); 135 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 136 struct btrfs_fs_info *fs_info); 137 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 138 u64 objectid); 139 int btree_lock_page_hook(struct page *page, void *data, 140 void (*flush_fn)(void *)); 141 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 142 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 143 int btrfs_init_root_free_objectid(struct btrfs_root *root); 144 145 #endif 146