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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (C) 2007 Oracle. All rights reserved.4 */5 6#ifndef BTRFS_DISK_IO_H7#define BTRFS_DISK_IO_H8 9#include <linux/sizes.h>10#include <linux/compiler_types.h>11#include "ctree.h"12#include "fs.h"13 14struct block_device;15struct super_block;16struct extent_buffer;17struct btrfs_device;18struct btrfs_fs_devices;19struct btrfs_fs_info;20struct btrfs_super_block;21struct btrfs_trans_handle;22struct btrfs_tree_parent_check;23struct btrfs_transaction;24 25#define BTRFS_SUPER_MIRROR_MAX 326#define BTRFS_SUPER_MIRROR_SHIFT 1227 28/*29 * Fixed blocksize for all devices, applies to specific ways of reading30 * metadata like superblock. Must meet the set_blocksize requirements.31 *32 * Do not change.33 */34#define BTRFS_BDEV_BLOCKSIZE (4096)35 36static inline u64 btrfs_sb_offset(int mirror)37{38 u64 start = SZ_16K;39 if (mirror)40 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);41 return BTRFS_SUPER_INFO_OFFSET;42}43 44void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info);45void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);46struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,47 struct btrfs_tree_parent_check *check);48struct extent_buffer *btrfs_find_create_tree_block(49 struct btrfs_fs_info *fs_info,50 u64 bytenr, u64 owner_root,51 int level);52int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);53int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,54 const struct btrfs_super_block *disk_sb);55int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,56 const char *options);57void __cold close_ctree(struct btrfs_fs_info *fs_info);58int btrfs_validate_super(const struct btrfs_fs_info *fs_info,59 const struct btrfs_super_block *sb, int mirror_num);60int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);61int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);62struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);63struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,64 int copy_num, bool drop_cache);65int btrfs_commit_super(struct btrfs_fs_info *fs_info);66struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,67 const struct btrfs_key *key);68int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,69 struct btrfs_root *root);70void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);71 72struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,73 u64 objectid, bool check_ref);74struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,75 u64 objectid, dev_t *anon_dev);76struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,77 struct btrfs_path *path,78 u64 objectid);79int btrfs_global_root_insert(struct btrfs_root *root);80void btrfs_global_root_delete(struct btrfs_root *root);81struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,82 struct btrfs_key *key);83struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);84struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);85 86void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);87void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);88void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);89void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,90 struct btrfs_root *root);91int btrfs_validate_extent_buffer(struct extent_buffer *eb,92 const struct btrfs_tree_parent_check *check);93#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS94struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);95#endif96 97/*98 * This function is used to grab the root, and avoid it is freed when we99 * access it. But it doesn't ensure that the tree is not dropped.100 *101 * If you want to ensure the whole tree is safe, you should use102 * fs_info->subvol_srcu103 */104static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)105{106 if (!root)107 return NULL;108 if (refcount_inc_not_zero(&root->refs))109 return root;110 return NULL;111}112 113void btrfs_put_root(struct btrfs_root *root);114void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,115 struct extent_buffer *buf);116int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,117 int atomic);118int btrfs_read_extent_buffer(struct extent_buffer *buf,119 const struct btrfs_tree_parent_check *check);120 121blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);122int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,123 struct btrfs_root *root);124int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,125 struct btrfs_fs_info *fs_info);126int btrfs_add_log_tree(struct btrfs_trans_handle *trans,127 struct btrfs_root *root);128void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,129 struct btrfs_fs_info *fs_info);130void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,131 struct btrfs_fs_info *fs_info);132struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,133 u64 objectid);134int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);135int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);136int btrfs_init_root_free_objectid(struct btrfs_root *root);137 138#endif139