Commit | Line | Data |
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6cbd5570 CM |
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 | ||
eb60ceac CM |
19 | #ifndef __DISKIO__ |
20 | #define __DISKIO__ | |
21 | ||
ee22184b | 22 | #define BTRFS_SUPER_INFO_OFFSET SZ_64K |
f2984462 | 23 | #define BTRFS_SUPER_INFO_SIZE 4096 |
a512bbf8 YZ |
24 | |
25 | #define BTRFS_SUPER_MIRROR_MAX 3 | |
26 | #define BTRFS_SUPER_MIRROR_SHIFT 12 | |
27 | ||
9f6d2510 DS |
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 | ||
bfebd8b5 | 36 | enum btrfs_wq_endio_type { |
53b381b3 DW |
37 | BTRFS_WQ_ENDIO_DATA = 0, |
38 | BTRFS_WQ_ENDIO_METADATA = 1, | |
39 | BTRFS_WQ_ENDIO_FREE_SPACE = 2, | |
40 | BTRFS_WQ_ENDIO_RAID56 = 3, | |
8b110e39 | 41 | BTRFS_WQ_ENDIO_DIO_REPAIR = 4, |
53b381b3 DW |
42 | }; |
43 | ||
a512bbf8 YZ |
44 | static inline u64 btrfs_sb_offset(int mirror) |
45 | { | |
ee22184b | 46 | u64 start = SZ_16K; |
a512bbf8 YZ |
47 | if (mirror) |
48 | return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); | |
49 | return BTRFS_SUPER_INFO_OFFSET; | |
50 | } | |
51 | ||
0b86a832 | 52 | struct btrfs_device; |
8a4b83cc | 53 | struct btrfs_fs_devices; |
e20d96d6 | 54 | |
2ff7e61e JM |
55 | struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, |
56 | u64 bytenr, u64 parent_transid); | |
57 | void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr); | |
58 | int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr, | |
ab0fff03 | 59 | int mirror_num, struct extent_buffer **eb); |
2ff7e61e JM |
60 | struct extent_buffer *btrfs_find_create_tree_block( |
61 | struct btrfs_fs_info *fs_info, | |
62 | u64 bytenr); | |
7c302b49 | 63 | void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf); |
ad2b2c80 AV |
64 | int open_ctree(struct super_block *sb, |
65 | struct btrfs_fs_devices *fs_devices, | |
66 | char *options); | |
6bccf3ab | 67 | void close_ctree(struct btrfs_fs_info *fs_info); |
eece6a9c | 68 | int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); |
a512bbf8 | 69 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev); |
29c36d72 AJ |
70 | int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, |
71 | struct buffer_head **bh_ret); | |
6bccf3ab | 72 | int btrfs_commit_super(struct btrfs_fs_info *fs_info); |
cb517eab MX |
73 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, |
74 | struct btrfs_key *location); | |
75 | int btrfs_init_fs_root(struct btrfs_root *root); | |
35bbb97f JM |
76 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
77 | u64 root_id); | |
cb517eab MX |
78 | int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, |
79 | struct btrfs_root *root); | |
faa2dbf0 | 80 | void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); |
c00869f1 MX |
81 | |
82 | struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, | |
83 | struct btrfs_key *key, | |
84 | bool check_ref); | |
85 | static inline struct btrfs_root * | |
86 | btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, | |
87 | struct btrfs_key *location) | |
88 | { | |
89 | return btrfs_get_fs_root(fs_info, location, true); | |
90 | } | |
91 | ||
c146afad | 92 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); |
2ff7e61e JM |
93 | void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); |
94 | void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); | |
cb517eab MX |
95 | void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, |
96 | struct btrfs_root *root); | |
97 | void btrfs_free_fs_root(struct btrfs_root *root); | |
b0feb9d9 | 98 | |
06ea65a3 | 99 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
da17066c | 100 | struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); |
06ea65a3 JB |
101 | #endif |
102 | ||
b0feb9d9 MX |
103 | /* |
104 | * This function is used to grab the root, and avoid it is freed when we | |
105 | * access it. But it doesn't ensure that the tree is not dropped. | |
106 | * | |
107 | * If you want to ensure the whole tree is safe, you should use | |
108 | * fs_info->subvol_srcu | |
109 | */ | |
110 | static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root) | |
111 | { | |
0700cea7 | 112 | if (refcount_inc_not_zero(&root->refs)) |
b0feb9d9 MX |
113 | return root; |
114 | return NULL; | |
115 | } | |
116 | ||
117 | static inline void btrfs_put_fs_root(struct btrfs_root *root) | |
118 | { | |
0700cea7 | 119 | if (refcount_dec_and_test(&root->refs)) |
b0feb9d9 MX |
120 | kfree(root); |
121 | } | |
122 | ||
5f39d397 | 123 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf); |
b9fab919 CM |
124 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, |
125 | int atomic); | |
ca7a79ad | 126 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid); |
9ed57367 | 127 | u32 btrfs_csum_data(const char *data, u32 seed, size_t len); |
0b5e3daf | 128 | void btrfs_csum_final(u32 crc, u8 *result); |
4e4cbee9 | 129 | blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
bfebd8b5 | 130 | enum btrfs_wq_endio_type metadata); |
8c27cb35 | 131 | blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, |
c6100a4b JB |
132 | int mirror_num, unsigned long bio_flags, |
133 | u64 bio_offset, void *private_data, | |
a758781d DS |
134 | extent_submit_bio_start_t *submit_bio_start, |
135 | extent_submit_bio_done_t *submit_bio_done); | |
e02119d5 | 136 | int btrfs_write_tree_block(struct extent_buffer *buf); |
3189ff77 | 137 | void btrfs_wait_tree_block_writeback(struct extent_buffer *buf); |
e02119d5 CM |
138 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, |
139 | struct btrfs_fs_info *fs_info); | |
7237f183 YZ |
140 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, |
141 | struct btrfs_root *root); | |
c79a1751 | 142 | void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, |
2ff7e61e | 143 | struct btrfs_fs_info *fs_info); |
49b25e05 | 144 | void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, |
2ff7e61e | 145 | struct btrfs_fs_info *fs_info); |
20897f5c AJ |
146 | struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, |
147 | struct btrfs_fs_info *fs_info, | |
148 | u64 objectid); | |
149 | int btree_lock_page_hook(struct page *page, void *data, | |
150 | void (*flush_fn)(void *)); | |
6af49dbd DS |
151 | struct extent_map *btree_get_extent(struct btrfs_inode *inode, |
152 | struct page *page, size_t pg_offset, u64 start, u64 len, | |
153 | int create); | |
943c6e99 | 154 | int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); |
97eb6b69 | 155 | int __init btrfs_end_io_wq_init(void); |
e67c718b | 156 | void __cold btrfs_end_io_wq_exit(void); |
4008c04a CM |
157 | |
158 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
85d4e461 CM |
159 | void btrfs_init_lockdep(void); |
160 | void btrfs_set_buffer_lockdep_class(u64 objectid, | |
161 | struct extent_buffer *eb, int level); | |
4008c04a | 162 | #else |
85d4e461 CM |
163 | static inline void btrfs_init_lockdep(void) |
164 | { } | |
165 | static inline void btrfs_set_buffer_lockdep_class(u64 objectid, | |
166 | struct extent_buffer *eb, int level) | |
4008c04a CM |
167 | { |
168 | } | |
169 | #endif | |
eb60ceac | 170 | #endif |