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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#define BTRFS_SUPER_MIRROR_MAX 3
10#define BTRFS_SUPER_MIRROR_SHIFT 12
11
12/*
13 * Fixed blocksize for all devices, applies to specific ways of reading
14 * metadata like superblock. Must meet the set_blocksize requirements.
15 *
16 * Do not change.
17 */
18#define BTRFS_BDEV_BLOCKSIZE (4096)
19
20static inline u64 btrfs_sb_offset(int mirror)
21{
22 u64 start = SZ_16K;
23 if (mirror)
24 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
25 return BTRFS_SUPER_INFO_OFFSET;
26}
27
28struct btrfs_device;
29struct btrfs_fs_devices;
30struct btrfs_tree_parent_check;
31
32void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
33void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
34int btrfs_verify_level_key(struct extent_buffer *eb, int level,
35 struct btrfs_key *first_key, u64 parent_transid);
36struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
37 struct btrfs_tree_parent_check *check);
38struct extent_buffer *btrfs_find_create_tree_block(
39 struct btrfs_fs_info *fs_info,
40 u64 bytenr, u64 owner_root,
41 int level);
42void btrfs_clean_tree_block(struct extent_buffer *buf);
43void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info);
44int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
45int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
46 const struct btrfs_super_block *disk_sb);
47int __cold open_ctree(struct super_block *sb,
48 struct btrfs_fs_devices *fs_devices,
49 char *options);
50void __cold close_ctree(struct btrfs_fs_info *fs_info);
51int btrfs_validate_super(struct btrfs_fs_info *fs_info,
52 struct btrfs_super_block *sb, int mirror_num);
53int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
54int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
55struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
56struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
57 int copy_num, bool drop_cache);
58int btrfs_commit_super(struct btrfs_fs_info *fs_info);
59struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
60 struct btrfs_key *key);
61int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
62 struct btrfs_root *root);
63void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
64
65struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
66 u64 objectid, bool check_ref);
67struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
68 u64 objectid, dev_t anon_dev);
69struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
70 struct btrfs_path *path,
71 u64 objectid);
72int btrfs_global_root_insert(struct btrfs_root *root);
73void btrfs_global_root_delete(struct btrfs_root *root);
74struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
75 struct btrfs_key *key);
76struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
77struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
78struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info);
79
80void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
81int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
82void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
83void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
84void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
85 struct btrfs_root *root);
86int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
87 struct page *page, u64 start, u64 end,
88 int mirror);
89void btrfs_submit_metadata_bio(struct btrfs_inode *inode, struct bio *bio, int mirror_num);
90#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
91struct 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 */
101static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
102{
103 if (!root)
104 return NULL;
105 if (refcount_inc_not_zero(&root->refs))
106 return root;
107 return NULL;
108}
109
110void btrfs_put_root(struct btrfs_root *root);
111void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
112int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
113 int atomic);
114int btrfs_read_extent_buffer(struct extent_buffer *buf,
115 struct btrfs_tree_parent_check *check);
116
117enum btrfs_wq_submit_cmd {
118 WQ_SUBMIT_METADATA,
119 WQ_SUBMIT_DATA,
120 WQ_SUBMIT_DATA_DIO,
121};
122
123bool btrfs_wq_submit_bio(struct btrfs_inode *inode, struct bio *bio, int mirror_num,
124 u64 dio_file_offset, enum btrfs_wq_submit_cmd cmd);
125blk_status_t btree_submit_bio_start(struct bio *bio);
126int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
127 struct btrfs_root *root);
128int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
129 struct btrfs_fs_info *fs_info);
130int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
131 struct btrfs_root *root);
132void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
133 struct btrfs_fs_info *fs_info);
134void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
135 struct btrfs_fs_info *fs_info);
136struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
137 u64 objectid);
138int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
139int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
140int btrfs_init_root_free_objectid(struct btrfs_root *root);
141
142#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#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(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);
56void __cold close_ctree(struct btrfs_fs_info *fs_info);
57int btrfs_validate_super(const struct btrfs_fs_info *fs_info,
58 const struct btrfs_super_block *sb, int mirror_num);
59int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
60int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
61struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
62struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
63 int copy_num, bool drop_cache);
64int btrfs_commit_super(struct btrfs_fs_info *fs_info);
65struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
66 const struct btrfs_key *key);
67int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
68 struct btrfs_root *root);
69void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
70
71struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
72 u64 objectid, bool check_ref);
73struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
74 u64 objectid, dev_t *anon_dev);
75struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
76 struct btrfs_path *path,
77 u64 objectid);
78int btrfs_global_root_insert(struct btrfs_root *root);
79void btrfs_global_root_delete(struct btrfs_root *root);
80struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
81 struct btrfs_key *key);
82struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
83struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
84
85void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
86void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
87void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
88void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
89 struct btrfs_root *root);
90int btrfs_validate_extent_buffer(struct extent_buffer *eb,
91 const struct btrfs_tree_parent_check *check);
92#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
93struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
94#endif
95
96/*
97 * This function is used to grab the root, and avoid it is freed when we
98 * access it. But it doesn't ensure that the tree is not dropped.
99 *
100 * If you want to ensure the whole tree is safe, you should use
101 * fs_info->subvol_srcu
102 */
103static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
104{
105 if (!root)
106 return NULL;
107 if (refcount_inc_not_zero(&root->refs))
108 return root;
109 return NULL;
110}
111
112void btrfs_put_root(struct btrfs_root *root);
113void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
114 struct extent_buffer *buf);
115int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
116 int atomic);
117int btrfs_read_extent_buffer(struct extent_buffer *buf,
118 const struct btrfs_tree_parent_check *check);
119
120blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
121int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
122 struct btrfs_root *root);
123int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
124 struct btrfs_fs_info *fs_info);
125int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
126 struct btrfs_root *root);
127void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
128 struct btrfs_fs_info *fs_info);
129void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans);
130struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
131 u64 objectid);
132int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
133int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
134int btrfs_init_root_free_objectid(struct btrfs_root *root);
135
136#endif