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 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 73 struct btrfs_path *path, 74 u64 objectid); 75 76 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 77 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 78 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 79 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 80 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 81 struct btrfs_root *root); 82 int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset, 83 struct page *page, u64 start, u64 end, 84 int mirror); 85 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, 86 int mirror_num, unsigned long bio_flags); 87 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 88 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 89 #endif 90 91 /* 92 * This function is used to grab the root, and avoid it is freed when we 93 * access it. But it doesn't ensure that the tree is not dropped. 94 * 95 * If you want to ensure the whole tree is safe, you should use 96 * fs_info->subvol_srcu 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 extent_buffer *buf); 109 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 110 int atomic); 111 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level, 112 struct btrfs_key *first_key); 113 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 114 enum btrfs_wq_endio_type metadata); 115 blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, 116 int mirror_num, unsigned long bio_flags, 117 u64 bio_offset, void *private_data, 118 extent_submit_bio_start_t *submit_bio_start); 119 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, 120 int mirror_num); 121 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 122 struct btrfs_fs_info *fs_info); 123 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 124 struct btrfs_root *root); 125 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 126 struct btrfs_fs_info *fs_info); 127 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 128 struct btrfs_fs_info *fs_info); 129 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 130 u64 objectid); 131 int btree_lock_page_hook(struct page *page, void *data, 132 void (*flush_fn)(void *)); 133 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 134 int __init btrfs_end_io_wq_init(void); 135 void __cold btrfs_end_io_wq_exit(void); 136 137 #ifdef CONFIG_DEBUG_LOCK_ALLOC 138 void btrfs_init_lockdep(void); 139 void btrfs_set_buffer_lockdep_class(u64 objectid, 140 struct extent_buffer *eb, int level); 141 #else 142 static inline void btrfs_init_lockdep(void) 143 { } 144 static inline void btrfs_set_buffer_lockdep_class(u64 objectid, 145 struct extent_buffer *eb, int level) 146 { 147 } 148 #endif 149 150 #endif 151