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 owner_root, u64 parent_transid, 47 int level, struct btrfs_key *first_key); 48 struct extent_buffer *btrfs_find_create_tree_block( 49 struct btrfs_fs_info *fs_info, 50 u64 bytenr, u64 owner_root, 51 int level); 52 void btrfs_clean_tree_block(struct extent_buffer *buf); 53 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); 54 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 55 int __cold open_ctree(struct super_block *sb, 56 struct btrfs_fs_devices *fs_devices, 57 char *options); 58 void __cold close_ctree(struct btrfs_fs_info *fs_info); 59 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 60 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 61 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 62 int copy_num); 63 int btrfs_commit_super(struct btrfs_fs_info *fs_info); 64 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 65 struct btrfs_key *key); 66 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 67 struct btrfs_root *root); 68 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 69 70 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 71 u64 objectid, bool check_ref); 72 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 73 u64 objectid, dev_t anon_dev); 74 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 75 struct btrfs_path *path, 76 u64 objectid); 77 78 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 79 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 80 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 81 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 82 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 83 struct btrfs_root *root); 84 int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, 85 struct page *page, u64 start, u64 end, 86 int mirror); 87 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, 88 int mirror_num, unsigned long bio_flags); 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 void btrfs_put_root(struct btrfs_root *root); 110 void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 111 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 112 int atomic); 113 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level, 114 struct btrfs_key *first_key); 115 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 116 enum btrfs_wq_endio_type metadata); 117 blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, 118 int mirror_num, unsigned long bio_flags, 119 u64 dio_file_offset, 120 extent_submit_bio_start_t *submit_bio_start); 121 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, 122 int mirror_num); 123 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, 124 struct btrfs_root *root); 125 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 126 struct btrfs_fs_info *fs_info); 127 int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 128 struct btrfs_root *root); 129 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 130 struct btrfs_fs_info *fs_info); 131 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 132 struct btrfs_fs_info *fs_info); 133 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 134 u64 objectid); 135 int btree_lock_page_hook(struct page *page, void *data, 136 void (*flush_fn)(void *)); 137 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 138 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 139 int btrfs_init_root_free_objectid(struct btrfs_root *root); 140 int __init btrfs_end_io_wq_init(void); 141 void __cold btrfs_end_io_wq_exit(void); 142 143 #ifdef CONFIG_DEBUG_LOCK_ALLOC 144 void btrfs_set_buffer_lockdep_class(u64 objectid, 145 struct extent_buffer *eb, int level); 146 #else 147 static inline void btrfs_set_buffer_lockdep_class(u64 objectid, 148 struct extent_buffer *eb, int level) 149 { 150 } 151 #endif 152 153 #endif 154