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1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#ifndef __DISKIO__
20#define __DISKIO__
21
22#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
23#define BTRFS_SUPER_INFO_SIZE 4096
24
25#define BTRFS_SUPER_MIRROR_MAX 3
26#define BTRFS_SUPER_MIRROR_SHIFT 12
27
28static inline u64 btrfs_sb_offset(int mirror)
29{
30 u64 start = 16 * 1024;
31 if (mirror)
32 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
33 return BTRFS_SUPER_INFO_OFFSET;
34}
35
36struct btrfs_device;
37struct btrfs_fs_devices;
38
39struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
40 u32 blocksize, u64 parent_transid);
41int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
42 u64 parent_transid);
43struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
44 u64 bytenr, u32 blocksize);
45int clean_tree_block(struct btrfs_trans_handle *trans,
46 struct btrfs_root *root, struct extent_buffer *buf);
47struct btrfs_root *open_ctree(struct super_block *sb,
48 struct btrfs_fs_devices *fs_devices,
49 char *options);
50int close_ctree(struct btrfs_root *root);
51int write_ctree_super(struct btrfs_trans_handle *trans,
52 struct btrfs_root *root, int max_mirrors);
53struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
54int btrfs_commit_super(struct btrfs_root *root);
55int btrfs_error_commit_super(struct btrfs_root *root);
56struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
57 u64 bytenr, u32 blocksize);
58struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
59 struct btrfs_key *location);
60struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
61 struct btrfs_key *location);
62int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
63void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
64void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
65int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
66void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
67int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
68int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
69int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
70u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
71void btrfs_csum_final(u32 crc, char *result);
72int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
73 int metadata);
74int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
75 int rw, struct bio *bio, int mirror_num,
76 unsigned long bio_flags, u64 bio_offset,
77 extent_submit_bio_hook_t *submit_bio_start,
78 extent_submit_bio_hook_t *submit_bio_done);
79unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
80int btrfs_write_tree_block(struct extent_buffer *buf);
81int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
82int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
83 struct btrfs_fs_info *fs_info);
84int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
85 struct btrfs_root *root);
86int btree_lock_page_hook(struct page *page);
87
88
89#ifdef CONFIG_DEBUG_LOCK_ALLOC
90void btrfs_init_lockdep(void);
91void btrfs_set_buffer_lockdep_class(u64 objectid,
92 struct extent_buffer *eb, int level);
93#else
94static inline void btrfs_init_lockdep(void)
95{ }
96static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
97 struct extent_buffer *eb, int level)
98{
99}
100#endif
101#endif
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
23enum btrfs_wq_endio_type {
24 BTRFS_WQ_ENDIO_DATA,
25 BTRFS_WQ_ENDIO_METADATA,
26 BTRFS_WQ_ENDIO_FREE_SPACE,
27 BTRFS_WQ_ENDIO_RAID56,
28};
29
30static inline u64 btrfs_sb_offset(int mirror)
31{
32 u64 start = SZ_16K;
33 if (mirror)
34 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
35 return BTRFS_SUPER_INFO_OFFSET;
36}
37
38struct btrfs_device;
39struct btrfs_fs_devices;
40
41void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
42void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
43int btrfs_verify_level_key(struct extent_buffer *eb, int level,
44 struct btrfs_key *first_key, u64 parent_transid);
45struct 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);
48void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
49struct extent_buffer *btrfs_find_create_tree_block(
50 struct btrfs_fs_info *fs_info,
51 u64 bytenr);
52void btrfs_clean_tree_block(struct extent_buffer *buf);
53int __cold open_ctree(struct super_block *sb,
54 struct btrfs_fs_devices *fs_devices,
55 char *options);
56void __cold close_ctree(struct btrfs_fs_info *fs_info);
57int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
58struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
59struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
60 int copy_num);
61int btrfs_commit_super(struct btrfs_fs_info *fs_info);
62struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
63 struct btrfs_key *key);
64int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
65 struct btrfs_root *root);
66void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
67
68struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
69 u64 objectid, bool check_ref);
70struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
71 u64 objectid, dev_t anon_dev);
72
73void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
74int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
75void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
76void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
77void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
78 struct btrfs_root *root);
79
80#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
81struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
82#endif
83
84/*
85 * This function is used to grab the root, and avoid it is freed when we
86 * access it. But it doesn't ensure that the tree is not dropped.
87 *
88 * If you want to ensure the whole tree is safe, you should use
89 * fs_info->subvol_srcu
90 */
91static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
92{
93 if (!root)
94 return NULL;
95 if (refcount_inc_not_zero(&root->refs))
96 return root;
97 return NULL;
98}
99
100void btrfs_put_root(struct btrfs_root *root);
101void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
102int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
103 int atomic);
104int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
105 struct btrfs_key *first_key);
106blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
107 enum btrfs_wq_endio_type metadata);
108blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
109 int mirror_num, unsigned long bio_flags,
110 u64 bio_offset, void *private_data,
111 extent_submit_bio_start_t *submit_bio_start);
112blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
113 int mirror_num);
114int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
115 struct btrfs_fs_info *fs_info);
116int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
117 struct btrfs_root *root);
118void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
119 struct btrfs_fs_info *fs_info);
120void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
121 struct btrfs_fs_info *fs_info);
122struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
123 u64 objectid);
124int btree_lock_page_hook(struct page *page, void *data,
125 void (*flush_fn)(void *));
126struct extent_map *btree_get_extent(struct btrfs_inode *inode,
127 struct page *page, size_t pg_offset,
128 u64 start, u64 len);
129int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
130int __init btrfs_end_io_wq_init(void);
131void __cold btrfs_end_io_wq_exit(void);
132
133#ifdef CONFIG_DEBUG_LOCK_ALLOC
134void btrfs_init_lockdep(void);
135void btrfs_set_buffer_lockdep_class(u64 objectid,
136 struct extent_buffer *eb, int level);
137#else
138static inline void btrfs_init_lockdep(void)
139{ }
140static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
141 struct extent_buffer *eb, int level)
142{
143}
144#endif
145
146#endif