| /* 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_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) |
| |
| 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; |
| struct btrfs_tree_parent_check; |
| |
| void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); |
| void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); |
| struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, |
| struct btrfs_tree_parent_check *check); |
| struct extent_buffer *btrfs_find_create_tree_block( |
| struct btrfs_fs_info *fs_info, |
| u64 bytenr, u64 owner_root, |
| int level); |
| void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans, |
| struct extent_buffer *buf); |
| void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info); |
| int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); |
| int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, |
| const struct btrfs_super_block *disk_sb); |
| 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 btrfs_validate_super(struct btrfs_fs_info *fs_info, |
| struct btrfs_super_block *sb, int mirror_num); |
| int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount); |
| 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, bool drop_cache); |
| 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); |
| int btrfs_global_root_insert(struct btrfs_root *root); |
| void btrfs_global_root_delete(struct btrfs_root *root); |
| struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, |
| struct btrfs_key *key); |
| struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); |
| struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); |
| struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info); |
| |
| void btrfs_free_fs_info(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_extent_buffer(struct extent_buffer *eb, |
| struct btrfs_tree_parent_check *check); |
| #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 btrfs_trans_handle *trans, |
| struct extent_buffer *buf); |
| int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, |
| int atomic); |
| int btrfs_read_extent_buffer(struct extent_buffer *buf, |
| struct btrfs_tree_parent_check *check); |
| |
| blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio); |
| int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| 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 btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); |
| int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); |
| int btrfs_init_root_free_objectid(struct btrfs_root *root); |
| |
| #endif |