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 | |
14 | struct block_device; |
15 | struct super_block; |
16 | struct extent_buffer; |
17 | struct btrfs_device; |
18 | struct btrfs_fs_devices; |
19 | struct btrfs_fs_info; |
20 | struct btrfs_super_block; |
21 | struct btrfs_trans_handle; |
22 | struct btrfs_tree_parent_check; |
23 | struct 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 | |
36 | static 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 | |
44 | void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info); |
45 | void btrfs_init_fs_info(struct btrfs_fs_info *fs_info); |
46 | struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, |
47 | struct btrfs_tree_parent_check *check); |
48 | struct extent_buffer *btrfs_find_create_tree_block( |
49 | struct btrfs_fs_info *fs_info, |
50 | u64 bytenr, u64 owner_root, |
51 | int level); |
52 | int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info); |
53 | int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, |
54 | const struct btrfs_super_block *disk_sb); |
55 | int __cold open_ctree(struct super_block *sb, |
56 | struct btrfs_fs_devices *fs_devices, |
57 | char *options); |
58 | void __cold close_ctree(struct btrfs_fs_info *fs_info); |
59 | int btrfs_validate_super(struct btrfs_fs_info *fs_info, |
60 | struct btrfs_super_block *sb, int mirror_num); |
61 | int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount); |
62 | int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); |
63 | struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev); |
64 | struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev, |
65 | int copy_num, bool drop_cache); |
66 | int btrfs_commit_super(struct btrfs_fs_info *fs_info); |
67 | struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, |
68 | struct btrfs_key *key); |
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 | u64 objectid, bool check_ref); |
75 | struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, |
76 | u64 objectid, dev_t *anon_dev); |
77 | struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, |
78 | struct btrfs_path *path, |
79 | u64 objectid); |
80 | int btrfs_global_root_insert(struct btrfs_root *root); |
81 | void btrfs_global_root_delete(struct btrfs_root *root); |
82 | struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, |
83 | struct btrfs_key *key); |
84 | struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr); |
85 | struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr); |
86 | struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info); |
87 | |
88 | void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); |
89 | void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); |
90 | void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); |
91 | void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, |
92 | struct btrfs_root *root); |
93 | int btrfs_validate_extent_buffer(struct extent_buffer *eb, |
94 | struct btrfs_tree_parent_check *check); |
95 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
96 | struct 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 | */ |
106 | static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) |
107 | { |
108 | if (!root) |
109 | return NULL; |
110 | if (refcount_inc_not_zero(r: &root->refs)) |
111 | return root; |
112 | return NULL; |
113 | } |
114 | |
115 | void btrfs_put_root(struct btrfs_root *root); |
116 | void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans, |
117 | struct extent_buffer *buf); |
118 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, |
119 | int atomic); |
120 | int btrfs_read_extent_buffer(struct extent_buffer *buf, |
121 | struct btrfs_tree_parent_check *check); |
122 | |
123 | blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio); |
124 | int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, |
125 | struct btrfs_root *root); |
126 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, |
127 | struct btrfs_fs_info *fs_info); |
128 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, |
129 | struct btrfs_root *root); |
130 | void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, |
131 | struct btrfs_fs_info *fs_info); |
132 | void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, |
133 | struct btrfs_fs_info *fs_info); |
134 | struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, |
135 | u64 objectid); |
136 | int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); |
137 | int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid); |
138 | int btrfs_init_root_free_objectid(struct btrfs_root *root); |
139 | |
140 | #endif |
141 | |