disk-io.h (6178B)
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 20enum 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 27static 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 35struct btrfs_device; 36struct btrfs_fs_devices; 37 38void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); 39void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); 40int btrfs_verify_level_key(struct extent_buffer *eb, int level, 41 struct btrfs_key *first_key, u64 parent_transid); 42struct 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); 45struct extent_buffer *btrfs_find_create_tree_block( 46 struct btrfs_fs_info *fs_info, 47 u64 bytenr, u64 owner_root, 48 int level); 49void btrfs_clean_tree_block(struct extent_buffer *buf); 50void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); 51int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); 52int __cold open_ctree(struct super_block *sb, 53 struct btrfs_fs_devices *fs_devices, 54 char *options); 55void __cold close_ctree(struct btrfs_fs_info *fs_info); 56int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); 57struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); 58struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, 59 int copy_num); 60int btrfs_commit_super(struct btrfs_fs_info *fs_info); 61struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, 62 struct btrfs_key *key); 63int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, 64 struct btrfs_root *root); 65void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); 66 67struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 68 u64 objectid, bool check_ref); 69struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, 70 u64 objectid, dev_t anon_dev); 71struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, 72 struct btrfs_path *path, 73 u64 objectid); 74int btrfs_global_root_insert(struct btrfs_root *root); 75void btrfs_global_root_delete(struct btrfs_root *root); 76struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, 77 struct btrfs_key *key); 78struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); 79struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); 80 81void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); 82int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); 83void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); 84void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); 85void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 86 struct btrfs_root *root); 87int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio, 88 struct page *page, u64 start, u64 end, 89 int mirror); 90void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num); 91#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 92struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); 93#endif 94 95/* 96 * This function is used to grab the root, and avoid it is freed when we 97 * access it. But it doesn't ensure that the tree is not dropped. 98 * 99 * If you want to ensure the whole tree is safe, you should use 100 * fs_info->subvol_srcu 101 */ 102static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) 103{ 104 if (!root) 105 return NULL; 106 if (refcount_inc_not_zero(&root->refs)) 107 return root; 108 return NULL; 109} 110 111static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info) 112{ 113 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) 114 return fs_info->block_group_root; 115 return btrfs_extent_root(fs_info, 0); 116} 117 118void btrfs_put_root(struct btrfs_root *root); 119void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 120int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, 121 int atomic); 122int btrfs_read_extent_buffer(struct extent_buffer *buf, u64 parent_transid, 123 int level, struct btrfs_key *first_key); 124blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 125 enum btrfs_wq_endio_type metadata); 126blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, 127 int mirror_num, u64 dio_file_offset, 128 extent_submit_bio_start_t *submit_bio_start); 129blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, 130 int mirror_num); 131int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, 132 struct btrfs_root *root); 133int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 134 struct btrfs_fs_info *fs_info); 135int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 136 struct btrfs_root *root); 137void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, 138 struct btrfs_fs_info *fs_info); 139void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, 140 struct btrfs_fs_info *fs_info); 141struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, 142 u64 objectid); 143int btree_lock_page_hook(struct page *page, void *data, 144 void (*flush_fn)(void *)); 145int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); 146int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); 147int btrfs_init_root_free_objectid(struct btrfs_root *root); 148int __init btrfs_end_io_wq_init(void); 149void __cold btrfs_end_io_wq_exit(void); 150 151#ifdef CONFIG_DEBUG_LOCK_ALLOC 152void btrfs_set_buffer_lockdep_class(u64 objectid, 153 struct extent_buffer *eb, int level); 154#else 155static inline void btrfs_set_buffer_lockdep_class(u64 objectid, 156 struct extent_buffer *eb, int level) 157{ 158} 159#endif 160 161#endif