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_INFO_OFFSET SZ_64K 10 #define BTRFS_SUPER_INFO_SIZE 4096 11 12 #define BTRFS_SUPER_MIRROR_MAX 3 13 #define BTRFS_SUPER_MIRROR_SHIFT 12 14 15 /* 16 * Fixed blocksize for all devices, applies to specific ways of reading 17 * metadata like superblock. Must meet the set_blocksize requirements. 18 * 19 * Do not change. 20 */ 21 #define BTRFS_BDEV_BLOCKSIZE (4096) 22 23 enum btrfs_wq_endio_type { 24 BTRFS_WQ_ENDIO_DATA, 25 BTRFS_WQ_ENDIO_METADATA, 26 BTRFS_WQ_ENDIO_FREE_SPACE, 27 BTRFS_WQ_ENDIO_RAID56, 28 }; 29 30 static inline u64 btrfs_sb_offset(int mirror) 31 { 32 u64 start = SZ_16K; 33 if (mirror) 34 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); 35 return BTRFS_SUPER_INFO_OFFSET; 36 } 37 38 struct btrfs_device; 39 struct btrfs_fs_devices; 40 41 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); 42 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); 43 int btrfs_verify_level_key(struct extent_buffer *eb, int level, 44 struct btrfs_key *first_key, u64 parent_transid); 45 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, 46 u64 parent_transid, int level, 47 struct btrfs_key *first_key); 48 void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr); 49 struct extent_buffer *btrfs_find_create_tree_block( 50 struct btrfs_fs_info *fs_info, 51 u64 bytenr); 52 void btrfs_clean_tree_block(struct extent_buffer *buf); 53 int __cold open_ctree(struct super_block *sb, 54 struct btrfs_fs_devices *fs_devices, 55 char *options); 56 void __cold close_ctree(struct btrfs_fs_info *fs_info); 57 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 58 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 59 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 60 int copy_num); 61 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 62 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 63 struct btrfs_key *key); 64 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 65 struct btrfs_root *root); 66 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 67 68 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 69 u64 objectid, bool check_ref); 70 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 71 u64 objectid, dev_t anon_dev); 72 73 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 74 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 75 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 76 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 77 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 78 struct btrfs_root *root); 79 80 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 81 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 82 #endif 83 84 /* 85 * This function is used to grab the root, and avoid it is freed when we 86 * access it. But it doesn't ensure that the tree is not dropped. 87 * 88 * If you want to ensure the whole tree is safe, you should use 89 * fs_info->subvol_srcu 90 */ 91 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 92 { 93 if (!root) 94 return NULL; 95 if (refcount_inc_not_zero(&root->refs)) 96 return root; 97 return NULL; 98 } 99 100 void btrfs_put_root(struct btrfs_root *root); 101 void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 102 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 103 int atomic); 104 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level, 105 struct btrfs_key *first_key); 106 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 107 enum btrfs_wq_endio_type metadata); 108 blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, 109 int mirror_num, unsigned long bio_flags, 110 u64 bio_offset, void *private_data, 111 extent_submit_bio_start_t *submit_bio_start); 112 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, 113 int mirror_num); 114 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 115 struct btrfs_fs_info *fs_info); 116 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 117 struct btrfs_root *root); 118 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 119 struct btrfs_fs_info *fs_info); 120 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 121 struct btrfs_fs_info *fs_info); 122 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 123 u64 objectid); 124 int btree_lock_page_hook(struct page *page, void *data, 125 void (*flush_fn)(void *)); 126 struct extent_map *btree_get_extent(struct btrfs_inode *inode, 127 struct page *page, size_t pg_offset, 128 u64 start, u64 len); 129 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 130 int __init btrfs_end_io_wq_init(void); 131 void __cold btrfs_end_io_wq_exit(void); 132 133 #ifdef CONFIG_DEBUG_LOCK_ALLOC 134 void btrfs_init_lockdep(void); 135 void btrfs_set_buffer_lockdep_class(u64 objectid, 136 struct extent_buffer *eb, int level); 137 #else 138 static inline void btrfs_init_lockdep(void) 139 { } 140 static inline void btrfs_set_buffer_lockdep_class(u64 objectid, 141 struct extent_buffer *eb, int level) 142 { 143 } 144 #endif 145 146 #endif 147