Commit | Line | Data |
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9888c340 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 CM |
4 | */ |
5 | ||
9888c340 DS |
6 | #ifndef BTRFS_DISK_IO_H |
7 | #define BTRFS_DISK_IO_H | |
eb60ceac | 8 | |
ee22184b | 9 | #define BTRFS_SUPER_INFO_OFFSET SZ_64K |
f2984462 | 10 | #define BTRFS_SUPER_INFO_SIZE 4096 |
a512bbf8 YZ |
11 | |
12 | #define BTRFS_SUPER_MIRROR_MAX 3 | |
13 | #define BTRFS_SUPER_MIRROR_SHIFT 12 | |
14 | ||
9f6d2510 DS |
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 | ||
bfebd8b5 | 23 | enum btrfs_wq_endio_type { |
53b381b3 DW |
24 | BTRFS_WQ_ENDIO_DATA = 0, |
25 | BTRFS_WQ_ENDIO_METADATA = 1, | |
26 | BTRFS_WQ_ENDIO_FREE_SPACE = 2, | |
27 | BTRFS_WQ_ENDIO_RAID56 = 3, | |
8b110e39 | 28 | BTRFS_WQ_ENDIO_DIO_REPAIR = 4, |
53b381b3 DW |
29 | }; |
30 | ||
a512bbf8 YZ |
31 | static inline u64 btrfs_sb_offset(int mirror) |
32 | { | |
ee22184b | 33 | u64 start = SZ_16K; |
a512bbf8 YZ |
34 | if (mirror) |
35 | return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); | |
36 | return BTRFS_SUPER_INFO_OFFSET; | |
37 | } | |
38 | ||
0b86a832 | 39 | struct btrfs_device; |
8a4b83cc | 40 | struct btrfs_fs_devices; |
e20d96d6 | 41 | |
581c1760 QW |
42 | struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, |
43 | u64 parent_transid, int level, | |
44 | struct btrfs_key *first_key); | |
2ff7e61e JM |
45 | void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr); |
46 | int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr, | |
ab0fff03 | 47 | int mirror_num, struct extent_buffer **eb); |
2ff7e61e JM |
48 | struct extent_buffer *btrfs_find_create_tree_block( |
49 | struct btrfs_fs_info *fs_info, | |
50 | u64 bytenr); | |
7c302b49 | 51 | void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf); |
ad2b2c80 AV |
52 | int open_ctree(struct super_block *sb, |
53 | struct btrfs_fs_devices *fs_devices, | |
54 | char *options); | |
6bccf3ab | 55 | void close_ctree(struct btrfs_fs_info *fs_info); |
eece6a9c | 56 | int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); |
a512bbf8 | 57 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev); |
29c36d72 AJ |
58 | int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, |
59 | struct buffer_head **bh_ret); | |
6bccf3ab | 60 | int btrfs_commit_super(struct btrfs_fs_info *fs_info); |
cb517eab MX |
61 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, |
62 | struct btrfs_key *location); | |
63 | int btrfs_init_fs_root(struct btrfs_root *root); | |
35bbb97f JM |
64 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
65 | u64 root_id); | |
cb517eab MX |
66 | int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, |
67 | struct btrfs_root *root); | |
faa2dbf0 | 68 | void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); |
c00869f1 MX |
69 | |
70 | struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, | |
71 | struct btrfs_key *key, | |
72 | bool check_ref); | |
73 | static inline struct btrfs_root * | |
74 | btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, | |
75 | struct btrfs_key *location) | |
76 | { | |
77 | return btrfs_get_fs_root(fs_info, location, true); | |
78 | } | |
79 | ||
c146afad | 80 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); |
2ff7e61e JM |
81 | void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); |
82 | void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); | |
cb517eab MX |
83 | void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, |
84 | struct btrfs_root *root); | |
85 | void btrfs_free_fs_root(struct btrfs_root *root); | |
b0feb9d9 | 86 | |
06ea65a3 | 87 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
da17066c | 88 | struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); |
06ea65a3 JB |
89 | #endif |
90 | ||
b0feb9d9 MX |
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 | */ | |
98 | static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root) | |
99 | { | |
0700cea7 | 100 | if (refcount_inc_not_zero(&root->refs)) |
b0feb9d9 MX |
101 | return root; |
102 | return NULL; | |
103 | } | |
104 | ||
105 | static inline void btrfs_put_fs_root(struct btrfs_root *root) | |
106 | { | |
0700cea7 | 107 | if (refcount_dec_and_test(&root->refs)) |
b0feb9d9 MX |
108 | kfree(root); |
109 | } | |
110 | ||
5f39d397 | 111 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf); |
b9fab919 CM |
112 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, |
113 | int atomic); | |
581c1760 QW |
114 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level, |
115 | struct btrfs_key *first_key); | |
9ed57367 | 116 | u32 btrfs_csum_data(const char *data, u32 seed, size_t len); |
0b5e3daf | 117 | void btrfs_csum_final(u32 crc, u8 *result); |
4e4cbee9 | 118 | blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
bfebd8b5 | 119 | enum btrfs_wq_endio_type metadata); |
8c27cb35 | 120 | blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, |
c6100a4b JB |
121 | int mirror_num, unsigned long bio_flags, |
122 | u64 bio_offset, void *private_data, | |
e288c080 DS |
123 | extent_submit_bio_start_t *submit_bio_start); |
124 | blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio, | |
125 | int mirror_num); | |
e02119d5 | 126 | int btrfs_write_tree_block(struct extent_buffer *buf); |
3189ff77 | 127 | void btrfs_wait_tree_block_writeback(struct extent_buffer *buf); |
e02119d5 CM |
128 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, |
129 | struct btrfs_fs_info *fs_info); | |
7237f183 YZ |
130 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, |
131 | struct btrfs_root *root); | |
c79a1751 | 132 | void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, |
2ff7e61e | 133 | struct btrfs_fs_info *fs_info); |
49b25e05 | 134 | void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, |
2ff7e61e | 135 | struct btrfs_fs_info *fs_info); |
20897f5c AJ |
136 | struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, |
137 | struct btrfs_fs_info *fs_info, | |
138 | u64 objectid); | |
139 | int btree_lock_page_hook(struct page *page, void *data, | |
140 | void (*flush_fn)(void *)); | |
6af49dbd DS |
141 | struct extent_map *btree_get_extent(struct btrfs_inode *inode, |
142 | struct page *page, size_t pg_offset, u64 start, u64 len, | |
143 | int create); | |
943c6e99 | 144 | int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); |
97eb6b69 | 145 | int __init btrfs_end_io_wq_init(void); |
e67c718b | 146 | void __cold btrfs_end_io_wq_exit(void); |
4008c04a CM |
147 | |
148 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
85d4e461 CM |
149 | void btrfs_init_lockdep(void); |
150 | void btrfs_set_buffer_lockdep_class(u64 objectid, | |
151 | struct extent_buffer *eb, int level); | |
4008c04a | 152 | #else |
85d4e461 CM |
153 | static inline void btrfs_init_lockdep(void) |
154 | { } | |
155 | static inline void btrfs_set_buffer_lockdep_class(u64 objectid, | |
156 | struct extent_buffer *eb, int level) | |
4008c04a CM |
157 | { |
158 | } | |
159 | #endif | |
9888c340 | 160 | |
eb60ceac | 161 | #endif |