1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19#ifndef __BTRFS_VOLUMES_
20#define __BTRFS_VOLUMES_
21
22#include <linux/bio.h>
23#include "async-thread.h"
24
25struct buffer_head;
26struct btrfs_pending_bios {
27 struct bio *head;
28 struct bio *tail;
29};
30
31struct btrfs_device {
32 struct list_head dev_list;
33 struct list_head dev_alloc_list;
34 struct btrfs_fs_devices *fs_devices;
35 struct btrfs_root *dev_root;
36
37
38 struct btrfs_pending_bios pending_bios;
39
40 struct btrfs_pending_bios pending_sync_bios;
41
42 int running_pending;
43 u64 generation;
44
45 int barriers;
46 int writeable;
47 int in_fs_metadata;
48
49 spinlock_t io_lock;
50
51 struct block_device *bdev;
52
53
54 fmode_t mode;
55
56 char *name;
57
58
59 u64 devid;
60
61
62 u64 total_bytes;
63
64
65 u64 disk_total_bytes;
66
67
68 u64 bytes_used;
69
70
71 u32 io_align;
72
73
74 u32 io_width;
75
76
77 u32 sector_size;
78
79
80 u64 type;
81
82
83 u8 uuid[BTRFS_UUID_SIZE];
84
85 struct btrfs_work work;
86};
87
88struct btrfs_fs_devices {
89 u8 fsid[BTRFS_FSID_SIZE];
90
91
92 u64 latest_devid;
93 u64 latest_trans;
94 u64 num_devices;
95 u64 open_devices;
96 u64 rw_devices;
97 u64 total_rw_bytes;
98 struct block_device *latest_bdev;
99
100
101
102
103
104 struct mutex device_list_mutex;
105 struct list_head devices;
106
107
108 struct list_head alloc_list;
109 struct list_head list;
110
111 struct btrfs_fs_devices *seed;
112 int seeding;
113
114 int opened;
115
116
117
118
119 int rotating;
120};
121
122struct btrfs_bio_stripe {
123 struct btrfs_device *dev;
124 u64 physical;
125};
126
127struct btrfs_multi_bio {
128 atomic_t stripes_pending;
129 bio_end_io_t *end_io;
130 struct bio *orig_bio;
131 void *private;
132 atomic_t error;
133 int max_errors;
134 int num_stripes;
135 struct btrfs_bio_stripe stripes[];
136};
137
138#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
139 (sizeof(struct btrfs_bio_stripe) * (n)))
140
141int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
142 struct btrfs_device *device,
143 u64 chunk_tree, u64 chunk_objectid,
144 u64 chunk_offset, u64 start, u64 num_bytes);
145int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
146 u64 logical, u64 *length,
147 struct btrfs_multi_bio **multi_ret, int mirror_num);
148int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
149 u64 chunk_start, u64 physical, u64 devid,
150 u64 **logical, int *naddrs, int *stripe_len);
151int btrfs_read_sys_array(struct btrfs_root *root);
152int btrfs_read_chunk_tree(struct btrfs_root *root);
153int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
154 struct btrfs_root *extent_root, u64 type);
155void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
156void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
157int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
158 int mirror_num, int async_submit);
159int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
160int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
161 fmode_t flags, void *holder);
162int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
163 struct btrfs_fs_devices **fs_devices_ret);
164int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
165int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
166int btrfs_add_device(struct btrfs_trans_handle *trans,
167 struct btrfs_root *root,
168 struct btrfs_device *device);
169int btrfs_rm_device(struct btrfs_root *root, char *device_path);
170int btrfs_cleanup_fs_uuids(void);
171int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
172int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
173 u64 logical, struct page *page);
174int btrfs_grow_device(struct btrfs_trans_handle *trans,
175 struct btrfs_device *device, u64 new_size);
176struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
177 u8 *uuid, u8 *fsid);
178int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
179int btrfs_init_new_device(struct btrfs_root *root, char *path);
180int btrfs_balance(struct btrfs_root *dev_root);
181void btrfs_unlock_volumes(void);
182void btrfs_lock_volumes(void);
183int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
184int find_free_dev_extent(struct btrfs_trans_handle *trans,
185 struct btrfs_device *device, u64 num_bytes,
186 u64 *start, u64 *max_avail);
187#endif
188