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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_H
7#define BTRFS_DISK_IO_H
8
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 3
26#define BTRFS_SUPER_MIRROR_SHIFT 12
27
28/*
29 * Fixed blocksize for all devices, applies to specific ways of reading
30 * 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(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,
56 struct btrfs_fs_devices *fs_devices,
57 char *options);
58void __cold close_ctree(struct btrfs_fs_info *fs_info);
59int btrfs_validate_super(struct btrfs_fs_info *fs_info,
60 struct btrfs_super_block *sb, int mirror_num);
61int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
62int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
63struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
64struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
65 int copy_num, bool drop_cache);
66int btrfs_commit_super(struct btrfs_fs_info *fs_info);
67struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
68 struct btrfs_key *key);
69int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
70 struct btrfs_root *root);
71void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
72
73struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
74 u64 objectid, bool check_ref);
75struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
76 u64 objectid, dev_t *anon_dev);
77struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
78 struct btrfs_path *path,
79 u64 objectid);
80int btrfs_global_root_insert(struct btrfs_root *root);
81void btrfs_global_root_delete(struct btrfs_root *root);
82struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
83 struct btrfs_key *key);
84struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
85struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
86struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info);
87
88void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
89void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
90void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
91void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
92 struct btrfs_root *root);
93int btrfs_validate_extent_buffer(struct extent_buffer *eb,
94 struct btrfs_tree_parent_check *check);
95#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
96struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
97#endif
98
99/*
100 * This function is used to grab the root, and avoid it is freed when we
101 * access it. But it doesn't ensure that the tree is not dropped.
102 *
103 * If you want to ensure the whole tree is safe, you should use
104 * fs_info->subvol_srcu
105 */
106static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
107{
108 if (!root)
109 return NULL;
110 if (refcount_inc_not_zero(&root->refs))
111 return root;
112 return NULL;
113}
114
115void btrfs_put_root(struct btrfs_root *root);
116void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
117 struct extent_buffer *buf);
118int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
119 int atomic);
120int btrfs_read_extent_buffer(struct extent_buffer *buf,
121 struct btrfs_tree_parent_check *check);
122
123blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
124int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
125 struct btrfs_root *root);
126int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
127 struct btrfs_fs_info *fs_info);
128int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
129 struct btrfs_root *root);
130void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
131 struct btrfs_fs_info *fs_info);
132void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
133 struct btrfs_fs_info *fs_info);
134struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
135 u64 objectid);
136int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
137int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
138int btrfs_init_root_free_objectid(struct btrfs_root *root);
139
140#endif
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