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 enum btrfs_wq_endio_type { 21 BTRFS_WQ_ENDIO_DATA, 22 BTRFS_WQ_ENDIO_METADATA, 23 BTRFS_WQ_ENDIO_FREE_SPACE, 24 BTRFS_WQ_ENDIO_RAID56, 25 }; 26 27 static inline u64 btrfs_sb_offset(int mirror) 28 { 29 u64 start = SZ_16K; 30 if (mirror) 31 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); 32 return BTRFS_SUPER_INFO_OFFSET; 33 } 34 35 struct btrfs_device; 36 struct btrfs_fs_devices; 37 38 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); 39 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); 40 int btrfs_verify_level_key(struct extent_buffer *eb, int level, 41 struct btrfs_key *first_key, u64 parent_transid); 42 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, 43 u64 owner_root, u64 parent_transid, 44 int level, struct btrfs_key *first_key); 45 struct extent_buffer *btrfs_find_create_tree_block( 46 struct btrfs_fs_info *fs_info, 47 u64 bytenr, u64 owner_root, 48 int level); 49 void btrfs_clean_tree_block(struct extent_buffer *buf); 50 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); 51 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 52 int __cold open_ctree(struct super_block *sb, 53 struct btrfs_fs_devices *fs_devices, 54 char *options); 55 void __cold close_ctree(struct btrfs_fs_info *fs_info); 56 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 57 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 58 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 59 int copy_num); 60 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 61 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 62 struct btrfs_key *key); 63 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 64 struct btrfs_root *root); 65 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 66 67 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 68 u64 objectid, bool check_ref); 69 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 70 u64 objectid, dev_t anon_dev); 71 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 72 struct btrfs_path *path, 73 u64 objectid); 74 int btrfs_global_root_insert(struct btrfs_root *root); 75 void btrfs_global_root_delete(struct btrfs_root *root); 76 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, 77 struct btrfs_key *key); 78 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); 79 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); 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 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, 91 int mirror_num, unsigned long bio_flags); 92 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 93 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 94 #endif 95 96 /* 97 * This function is used to grab the root, and avoid it is freed when we 98 * access it. But it doesn't ensure that the tree is not dropped. 99 * 100 * If you want to ensure the whole tree is safe, you should use 101 * fs_info->subvol_srcu 102 */ 103 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 104 { 105 if (!root) 106 return NULL; 107 if (refcount_inc_not_zero(&root->refs)) 108 return root; 109 return NULL; 110 } 111 112 static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info) 113 { 114 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) 115 return fs_info->block_group_root; 116 return btrfs_extent_root(fs_info, 0); 117 } 118 119 void btrfs_put_root(struct btrfs_root *root); 120 void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 121 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 122 int atomic); 123 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level, 124 struct btrfs_key *first_key); 125 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 126 enum btrfs_wq_endio_type metadata); 127 blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, 128 int mirror_num, unsigned long bio_flags, 129 u64 dio_file_offset, 130 extent_submit_bio_start_t *submit_bio_start); 131 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, 132 int mirror_num); 133 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, 134 struct btrfs_root *root); 135 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 136 struct btrfs_fs_info *fs_info); 137 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 138 struct btrfs_root *root); 139 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 140 struct btrfs_fs_info *fs_info); 141 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 142 struct btrfs_fs_info *fs_info); 143 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 144 u64 objectid); 145 int btree_lock_page_hook(struct page *page, void *data, 146 void (*flush_fn)(void *)); 147 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 148 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 149 int btrfs_init_root_free_objectid(struct btrfs_root *root); 150 int __init btrfs_end_io_wq_init(void); 151 void __cold btrfs_end_io_wq_exit(void); 152 153 #ifdef CONFIG_DEBUG_LOCK_ALLOC 154 void btrfs_set_buffer_lockdep_class(u64 objectid, 155 struct extent_buffer *eb, int level); 156 #else 157 static inline void btrfs_set_buffer_lockdep_class(u64 objectid, 158 struct extent_buffer *eb, int level) 159 { 160 } 161 #endif 162 163 #endif 164