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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Copyright (C) 2007 Oracle. All rights reserved.
- */
- #ifndef BTRFS_DISK_IO_H
- #define BTRFS_DISK_IO_H
- #define BTRFS_SUPER_INFO_OFFSET SZ_64K
- #define BTRFS_SUPER_INFO_SIZE 4096
- #define BTRFS_SUPER_MIRROR_MAX 3
- #define BTRFS_SUPER_MIRROR_SHIFT 12
- /*
- * Fixed blocksize for all devices, applies to specific ways of reading
- * metadata like superblock. Must meet the set_blocksize requirements.
- *
- * Do not change.
- */
- #define BTRFS_BDEV_BLOCKSIZE (4096)
- enum btrfs_wq_endio_type {
- BTRFS_WQ_ENDIO_DATA,
- BTRFS_WQ_ENDIO_METADATA,
- BTRFS_WQ_ENDIO_FREE_SPACE,
- BTRFS_WQ_ENDIO_RAID56,
- };
- static inline u64 btrfs_sb_offset(int mirror)
- {
- u64 start = SZ_16K;
- if (mirror)
- return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
- return BTRFS_SUPER_INFO_OFFSET;
- }
- struct btrfs_device;
- struct btrfs_fs_devices;
- void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
- void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
- int btrfs_verify_level_key(struct extent_buffer *eb, int level,
- struct btrfs_key *first_key, u64 parent_transid);
- struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
- u64 parent_transid, int level,
- struct btrfs_key *first_key);
- void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
- struct extent_buffer *btrfs_find_create_tree_block(
- struct btrfs_fs_info *fs_info,
- u64 bytenr);
- void btrfs_clean_tree_block(struct extent_buffer *buf);
- int __cold open_ctree(struct super_block *sb,
- struct btrfs_fs_devices *fs_devices,
- char *options);
- void __cold close_ctree(struct btrfs_fs_info *fs_info);
- int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
- struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
- struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
- int copy_num);
- int btrfs_commit_super(struct btrfs_fs_info *fs_info);
- struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
- struct btrfs_key *key);
- int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
- struct btrfs_root *root);
- void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
- struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
- u64 objectid, bool check_ref);
- struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
- u64 objectid, dev_t anon_dev);
- struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
- struct btrfs_path *path,
- u64 objectid);
- void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
- int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
- void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
- void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
- void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
- struct btrfs_root *root);
- int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset,
- struct page *page, u64 start, u64 end,
- int mirror);
- blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
- int mirror_num, unsigned long bio_flags);
- #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
- struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
- #endif
- /*
- * This function is used to grab the root, and avoid it is freed when we
- * access it. But it doesn't ensure that the tree is not dropped.
- *
- * If you want to ensure the whole tree is safe, you should use
- * fs_info->subvol_srcu
- */
- static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
- {
- if (!root)
- return NULL;
- if (refcount_inc_not_zero(&root->refs))
- return root;
- return NULL;
- }
- void btrfs_put_root(struct btrfs_root *root);
- void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
- int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
- int atomic);
- int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
- struct btrfs_key *first_key);
- blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
- enum btrfs_wq_endio_type metadata);
- blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
- int mirror_num, unsigned long bio_flags,
- u64 bio_offset, void *private_data,
- extent_submit_bio_start_t *submit_bio_start);
- blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
- int mirror_num);
- int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info);
- int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
- struct btrfs_root *root);
- void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
- struct btrfs_fs_info *fs_info);
- void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
- struct btrfs_fs_info *fs_info);
- struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
- u64 objectid);
- int btree_lock_page_hook(struct page *page, void *data,
- void (*flush_fn)(void *));
- int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
- int __init btrfs_end_io_wq_init(void);
- void __cold btrfs_end_io_wq_exit(void);
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- void btrfs_init_lockdep(void);
- void btrfs_set_buffer_lockdep_class(u64 objectid,
- struct extent_buffer *eb, int level);
- #else
- static inline void btrfs_init_lockdep(void)
- { }
- static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
- struct extent_buffer *eb, int level)
- {
- }
- #endif
- #endif
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