tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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);
34struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
35 struct btrfs_tree_parent_check *check);
36struct extent_buffer *btrfs_find_create_tree_block(
37 struct btrfs_fs_info *fs_info,
38 u64 bytenr, u64 owner_root,
39 int level);
40void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
41 struct extent_buffer *buf);
42void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info);
43int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
44int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
45 const struct btrfs_super_block *disk_sb);
46int __cold open_ctree(struct super_block *sb,
47 struct btrfs_fs_devices *fs_devices,
48 char *options);
49void __cold close_ctree(struct btrfs_fs_info *fs_info);
50int btrfs_validate_super(struct btrfs_fs_info *fs_info,
51 struct btrfs_super_block *sb, int mirror_num);
52int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
53int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
54struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
55struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
56 int copy_num, bool drop_cache);
57int btrfs_commit_super(struct btrfs_fs_info *fs_info);
58struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
59 struct btrfs_key *key);
60int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
61 struct btrfs_root *root);
62void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
63
64struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
65 u64 objectid, bool check_ref);
66struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
67 u64 objectid, dev_t anon_dev);
68struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
69 struct btrfs_path *path,
70 u64 objectid);
71int btrfs_global_root_insert(struct btrfs_root *root);
72void btrfs_global_root_delete(struct btrfs_root *root);
73struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
74 struct btrfs_key *key);
75struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
76struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
77struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info);
78
79void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
80int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
81void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
82void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
83void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
84 struct btrfs_root *root);
85int btrfs_validate_extent_buffer(struct extent_buffer *eb,
86 struct btrfs_tree_parent_check *check);
87#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
88struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
89#endif
90
91/*
92 * This function is used to grab the root, and avoid it is freed when we
93 * access it. But it doesn't ensure that the tree is not dropped.
94 *
95 * If you want to ensure the whole tree is safe, you should use
96 * fs_info->subvol_srcu
97 */
98static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
99{
100 if (!root)
101 return NULL;
102 if (refcount_inc_not_zero(&root->refs))
103 return root;
104 return NULL;
105}
106
107void btrfs_put_root(struct btrfs_root *root);
108void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
109int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
110 int atomic);
111int btrfs_read_extent_buffer(struct extent_buffer *buf,
112 struct btrfs_tree_parent_check *check);
113
114blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
115int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
116 struct btrfs_root *root);
117int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
118 struct btrfs_fs_info *fs_info);
119int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
120 struct btrfs_root *root);
121void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
122 struct btrfs_fs_info *fs_info);
123void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
124 struct btrfs_fs_info *fs_info);
125struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
126 u64 objectid);
127int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
128int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
129int btrfs_init_root_free_objectid(struct btrfs_root *root);
130
131#endif