Btrfs: replace tree->mapping with tree->private_data
[sfrench/cifs-2.6.git] / fs / btrfs / disk-io.h
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
19 #ifndef __DISKIO__
20 #define __DISKIO__
21
22 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
23 #define BTRFS_SUPER_INFO_SIZE 4096
24
25 #define BTRFS_SUPER_MIRROR_MAX   3
26 #define BTRFS_SUPER_MIRROR_SHIFT 12
27
28 enum btrfs_wq_endio_type {
29         BTRFS_WQ_ENDIO_DATA = 0,
30         BTRFS_WQ_ENDIO_METADATA = 1,
31         BTRFS_WQ_ENDIO_FREE_SPACE = 2,
32         BTRFS_WQ_ENDIO_RAID56 = 3,
33         BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
34 };
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 struct btrfs_device;
45 struct btrfs_fs_devices;
46
47 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info,
48                                       u64 bytenr, u64 parent_transid);
49 void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
50 int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
51                          int mirror_num, struct extent_buffer **eb);
52 struct extent_buffer *btrfs_find_create_tree_block(
53                                                 struct btrfs_fs_info *fs_info,
54                                                 u64 bytenr);
55 void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
56 int open_ctree(struct super_block *sb,
57                struct btrfs_fs_devices *fs_devices,
58                char *options);
59 void close_ctree(struct btrfs_fs_info *fs_info);
60 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
61 struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
62 int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
63                         struct buffer_head **bh_ret);
64 int btrfs_commit_super(struct btrfs_fs_info *fs_info);
65 struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
66                                       struct btrfs_key *location);
67 int btrfs_init_fs_root(struct btrfs_root *root);
68 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
69                                         u64 root_id);
70 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
71                          struct btrfs_root *root);
72 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
73
74 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
75                                      struct btrfs_key *key,
76                                      bool check_ref);
77 static inline struct btrfs_root *
78 btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
79                            struct btrfs_key *location)
80 {
81         return btrfs_get_fs_root(fs_info, location, true);
82 }
83
84 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
85 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
86 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
87 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
88                                  struct btrfs_root *root);
89 void btrfs_free_fs_root(struct btrfs_root *root);
90
91 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
92 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
93 #endif
94
95 /*
96  * This function is used to grab the root, and avoid it is freed when we
97  * access it. But it doesn't ensure that the tree is not dropped.
98  *
99  * If you want to ensure the whole tree is safe, you should use
100  *      fs_info->subvol_srcu
101  */
102 static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
103 {
104         if (refcount_inc_not_zero(&root->refs))
105                 return root;
106         return NULL;
107 }
108
109 static inline void btrfs_put_fs_root(struct btrfs_root *root)
110 {
111         if (refcount_dec_and_test(&root->refs))
112                 kfree(root);
113 }
114
115 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
116 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
117                           int atomic);
118 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
119 u32 btrfs_csum_data(const char *data, u32 seed, size_t len);
120 void btrfs_csum_final(u32 crc, u8 *result);
121 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
122                         enum btrfs_wq_endio_type metadata);
123 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
124                         int mirror_num, unsigned long bio_flags,
125                         u64 bio_offset, void *private_data,
126                         extent_submit_bio_hook_t *submit_bio_start,
127                         extent_submit_bio_hook_t *submit_bio_done);
128 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
129 int btrfs_write_tree_block(struct extent_buffer *buf);
130 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
131 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
132                              struct btrfs_fs_info *fs_info);
133 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
134                        struct btrfs_root *root);
135 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
136                              struct btrfs_fs_info *fs_info);
137 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
138                                   struct btrfs_fs_info *fs_info);
139 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
140                                      struct btrfs_fs_info *fs_info,
141                                      u64 objectid);
142 int btree_lock_page_hook(struct page *page, void *data,
143                                 void (*flush_fn)(void *));
144 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
145 int btrfs_calc_num_tolerated_disk_barrier_failures(
146         struct btrfs_fs_info *fs_info);
147 int __init btrfs_end_io_wq_init(void);
148 void btrfs_end_io_wq_exit(void);
149
150 #ifdef CONFIG_DEBUG_LOCK_ALLOC
151 void btrfs_init_lockdep(void);
152 void btrfs_set_buffer_lockdep_class(u64 objectid,
153                                     struct extent_buffer *eb, int level);
154 #else
155 static inline void btrfs_init_lockdep(void)
156 { }
157 static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
158                                         struct extent_buffer *eb, int level)
159 {
160 }
161 #endif
162 #endif