Blame - src/kernel/linux/v4.19/fs/btrfs/disk-io.h - T800

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xj	b04a402	2021-11-25 15:01:52 +0800	[diff] [blame^]	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_INFO_OFFSET SZ_64K
				10	#define BTRFS_SUPER_INFO_SIZE 4096
				11
				12	#define BTRFS_SUPER_MIRROR_MAX 3
				13	#define BTRFS_SUPER_MIRROR_SHIFT 12
				14
				15	/*
				16	* Fixed blocksize for all devices, applies to specific ways of reading
				17	* metadata like superblock. Must meet the set_blocksize requirements.
				18	*
				19	* Do not change.
				20	*/
				21	#define BTRFS_BDEV_BLOCKSIZE (4096)
				22
				23	enum btrfs_wq_endio_type {
				24	BTRFS_WQ_ENDIO_DATA = 0,
				25	BTRFS_WQ_ENDIO_METADATA = 1,
				26	BTRFS_WQ_ENDIO_FREE_SPACE = 2,
				27	BTRFS_WQ_ENDIO_RAID56 = 3,
				28	BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
				29	};
				30
				31	static inline u64 btrfs_sb_offset(int mirror)
				32	{
				33	u64 start = SZ_16K;
				34	if (mirror)
				35	return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
				36	return BTRFS_SUPER_INFO_OFFSET;
				37	}
				38
				39	struct btrfs_device;
				40	struct btrfs_fs_devices;
				41
				42	int btrfs_verify_level_key(struct btrfs_fs_info *fs_info,
				43	struct extent_buffer *eb, int level,
				44	struct btrfs_key *first_key, u64 parent_transid);
				45	struct extent_buffer read_tree_block(struct btrfs_fs_info fs_info, u64 bytenr,
				46	u64 parent_transid, int level,
				47	struct btrfs_key *first_key);
				48	void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
				49	int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
				50	int mirror_num, struct extent_buffer **eb);
				51	struct extent_buffer *btrfs_find_create_tree_block(
				52	struct btrfs_fs_info *fs_info,
				53	u64 bytenr);
				54	void clean_tree_block(struct btrfs_fs_info fs_info, struct extent_buffer buf);
				55	int open_ctree(struct super_block *sb,
				56	struct btrfs_fs_devices *fs_devices,
				57	char *options);
				58	void close_ctree(struct btrfs_fs_info *fs_info);
				59	int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
				60	struct buffer_head btrfs_read_dev_super(struct block_device bdev);
				61	int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
				62	struct buffer_head **bh_ret);
				63	int btrfs_commit_super(struct btrfs_fs_info *fs_info);
				64	struct btrfs_root btrfs_read_fs_root(struct btrfs_root tree_root,
				65	struct btrfs_key *location);
				66	int btrfs_init_fs_root(struct btrfs_root *root);
				67	struct btrfs_root btrfs_lookup_fs_root(struct btrfs_fs_info fs_info,
				68	u64 root_id);
				69	int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
				70	struct btrfs_root *root);
				71	void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
				72
				73	struct btrfs_root btrfs_get_fs_root(struct btrfs_fs_info fs_info,
				74	struct btrfs_key *key,
				75	bool check_ref);
				76	static inline struct btrfs_root *
				77	btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
				78	struct btrfs_key *location)
				79	{
				80	return btrfs_get_fs_root(fs_info, location, true);
				81	}
				82
				83	int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
				84	void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
				85	void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
				86	void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
				87	struct btrfs_root *root);
				88	void btrfs_free_fs_root(struct btrfs_root *root);
				89
				90	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
				91	struct btrfs_root btrfs_alloc_dummy_root(struct btrfs_fs_info fs_info);
				92	#endif
				93
				94	/*
				95	* This function is used to grab the root, and avoid it is freed when we
				96	* access it. But it doesn't ensure that the tree is not dropped.
				97	*
				98	* If you want to ensure the whole tree is safe, you should use
				99	* fs_info->subvol_srcu
				100	*/
				101	static inline struct btrfs_root btrfs_grab_fs_root(struct btrfs_root root)
				102	{
				103	if (refcount_inc_not_zero(&root->refs))
				104	return root;
				105	return NULL;
				106	}
				107
				108	static inline void btrfs_put_fs_root(struct btrfs_root *root)
				109	{
				110	if (refcount_dec_and_test(&root->refs))
				111	kfree(root);
				112	}
				113
				114	void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
				115	int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
				116	int atomic);
				117	int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
				118	struct btrfs_key *first_key);
				119	u32 btrfs_csum_data(const char *data, u32 seed, size_t len);
				120	void btrfs_csum_final(u32 crc, u8 *result);
				121	blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info info, struct bio bio,
				122	enum btrfs_wq_endio_type metadata);
				123	blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info fs_info, struct bio bio,
				124	int mirror_num, unsigned long bio_flags,
				125	u64 bio_offset, void *private_data,
				126	extent_submit_bio_start_t *submit_bio_start);
				127	blk_status_t btrfs_submit_bio_done(void private_data, struct bio bio,
				128	int mirror_num);
				129	int btrfs_write_tree_block(struct extent_buffer *buf);
				130	void btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
				131	int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
				132	struct btrfs_fs_info *fs_info);
				133	int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
				134	struct btrfs_root *root);
				135	void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
				136	struct btrfs_fs_info *fs_info);
				137	void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
				138	struct btrfs_fs_info *fs_info);
				139	struct btrfs_root btrfs_create_tree(struct btrfs_trans_handle trans,
				140	struct btrfs_fs_info *fs_info,
				141	u64 objectid);
				142	int btree_lock_page_hook(struct page page, void data,
				143	void (flush_fn)(void ));
				144	struct extent_map btree_get_extent(struct btrfs_inode inode,
				145	struct page *page, size_t pg_offset, u64 start, u64 len,
				146	int create);
				147	int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
				148	int __init btrfs_end_io_wq_init(void);
				149	void __cold btrfs_end_io_wq_exit(void);
				150
				151	#ifdef CONFIG_DEBUG_LOCK_ALLOC
				152	void btrfs_init_lockdep(void);
				153	void btrfs_set_buffer_lockdep_class(u64 objectid,
				154	struct extent_buffer *eb, int level);
				155	#else
				156	static inline void btrfs_init_lockdep(void)
				157	{ }
				158	static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
				159	struct extent_buffer *eb, int level)
				160	{
				161	}
				162	#endif
				163
				164	#endif