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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/fs/btrfs/disk-io.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Copyright (C) 2007 Oracle.  All rights reserved.

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 */

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#ifndef BTRFS_DISK_IO_H

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#define BTRFS_DISK_IO_H

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#include <linux/sizes.h>

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#include <linux/compiler_types.h>

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#include "ctree.h"

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#include "fs.h"

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struct block_device;

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struct super_block;

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struct extent_buffer;

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struct btrfs_device;

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struct btrfs_fs_devices;

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struct btrfs_fs_info;

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struct btrfs_super_block;

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struct btrfs_trans_handle;

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struct btrfs_tree_parent_check;

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struct btrfs_transaction;

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#define BTRFS_SUPER_MIRROR_MAX	 3

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#define BTRFS_SUPER_MIRROR_SHIFT 12

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/*

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 * Fixed blocksize for all devices, applies to specific ways of reading

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 * metadata like superblock. Must meet the set_blocksize requirements.

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 *

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 * Do not change.

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 */

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#define BTRFS_BDEV_BLOCKSIZE	(4096)

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static inline u64 btrfs_sb_offset(int mirror)

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{

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	u64 start = SZ_16K;

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	if (mirror)

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		return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);

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	return BTRFS_SUPER_INFO_OFFSET;

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}

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void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info);

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void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);

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struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,

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				      struct btrfs_tree_parent_check *check);

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struct extent_buffer *btrfs_find_create_tree_block(

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						struct btrfs_fs_info *fs_info,

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						u64 bytenr, u64 owner_root,

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						int level);

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int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);

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int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,

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			   const struct btrfs_super_block *disk_sb);

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int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices);

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void __cold close_ctree(struct btrfs_fs_info *fs_info);

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int btrfs_validate_super(const struct btrfs_fs_info *fs_info,

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			 const struct btrfs_super_block *sb, int mirror_num);

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int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);

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int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);

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int btrfs_commit_super(struct btrfs_fs_info *fs_info);

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struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,

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					const struct btrfs_key *key);

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int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,

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			 struct btrfs_root *root);

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void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);

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struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,

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				     u64 objectid, bool check_ref);

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struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,

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					 u64 objectid, dev_t *anon_dev);

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struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,

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						 struct btrfs_path *path,

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						 u64 objectid);

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int btrfs_global_root_insert(struct btrfs_root *root);

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void btrfs_global_root_delete(struct btrfs_root *root);

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struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,

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				     struct btrfs_key *key);

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struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);

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struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);

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void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);

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void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);

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void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);

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void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,

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				 struct btrfs_root *root);

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int btrfs_validate_extent_buffer(struct extent_buffer *eb,

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				 const struct btrfs_tree_parent_check *check);

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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS

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struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);

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#endif

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/*

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 * This function is used to grab the root, and avoid it is freed when we

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 * access it. But it doesn't ensure that the tree is not dropped.

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 */

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static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)

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{

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	if (!root)

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		return NULL;

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	if (refcount_inc_not_zero(&root->refs))

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		return root;

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	return NULL;

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}

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void btrfs_put_root(struct btrfs_root *root);

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void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,

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			     struct extent_buffer *buf);

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int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,

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			  int atomic);

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int btrfs_read_extent_buffer(struct extent_buffer *buf,

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			     const struct btrfs_tree_parent_check *check);

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int btree_csum_one_bio(struct btrfs_bio *bbio);

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int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,

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			      struct btrfs_root *root);

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int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,

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			     struct btrfs_fs_info *fs_info);

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int btrfs_add_log_tree(struct btrfs_trans_handle *trans,

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		       struct btrfs_root *root);

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void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,

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			     struct btrfs_fs_info *fs_info);

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void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans);

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struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,

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				     u64 objectid);

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int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);

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int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);

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int btrfs_init_root_free_objectid(struct btrfs_root *root);

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#endif

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