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0b86a832 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 | ||
19 | #ifndef __BTRFS_VOLUMES_ | |
20 | #define __BTRFS_VOLUMES_ | |
8790d502 | 21 | |
cea9e445 | 22 | #include <linux/bio.h> |
8b712842 | 23 | #include "async-thread.h" |
cea9e445 | 24 | |
f2984462 | 25 | struct buffer_head; |
ffbd517d CM |
26 | struct btrfs_pending_bios { |
27 | struct bio *head; | |
28 | struct bio *tail; | |
29 | }; | |
30 | ||
0b86a832 CM |
31 | struct btrfs_device { |
32 | struct list_head dev_list; | |
b3075717 | 33 | struct list_head dev_alloc_list; |
2b82032c | 34 | struct btrfs_fs_devices *fs_devices; |
0b86a832 | 35 | struct btrfs_root *dev_root; |
ffbd517d CM |
36 | |
37 | /* regular prio bios */ | |
38 | struct btrfs_pending_bios pending_bios; | |
39 | /* WRITE_SYNC bios */ | |
40 | struct btrfs_pending_bios pending_sync_bios; | |
41 | ||
8b712842 | 42 | int running_pending; |
dfe25020 | 43 | u64 generation; |
b3075717 | 44 | |
2b82032c | 45 | int writeable; |
dfe25020 | 46 | int in_fs_metadata; |
b3075717 | 47 | |
8790d502 | 48 | spinlock_t io_lock; |
0b86a832 CM |
49 | |
50 | struct block_device *bdev; | |
51 | ||
15916de8 CM |
52 | /* the mode sent to open_bdev_exclusive */ |
53 | fmode_t mode; | |
54 | ||
8a4b83cc CM |
55 | char *name; |
56 | ||
0b86a832 CM |
57 | /* the internal btrfs device id */ |
58 | u64 devid; | |
59 | ||
60 | /* size of the device */ | |
61 | u64 total_bytes; | |
62 | ||
d6397bae CB |
63 | /* size of the disk */ |
64 | u64 disk_total_bytes; | |
65 | ||
0b86a832 CM |
66 | /* bytes used */ |
67 | u64 bytes_used; | |
68 | ||
69 | /* optimal io alignment for this device */ | |
70 | u32 io_align; | |
71 | ||
72 | /* optimal io width for this device */ | |
73 | u32 io_width; | |
74 | ||
75 | /* minimal io size for this device */ | |
76 | u32 sector_size; | |
77 | ||
0b86a832 CM |
78 | /* type and info about this device */ |
79 | u64 type; | |
80 | ||
0b86a832 | 81 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 82 | u8 uuid[BTRFS_UUID_SIZE]; |
8b712842 CM |
83 | |
84 | struct btrfs_work work; | |
0b86a832 CM |
85 | }; |
86 | ||
8a4b83cc CM |
87 | struct btrfs_fs_devices { |
88 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
89 | ||
d4a78947 | 90 | /* the device with this id has the most recent copy of the super */ |
8a4b83cc CM |
91 | u64 latest_devid; |
92 | u64 latest_trans; | |
8a4b83cc | 93 | u64 num_devices; |
a0af469b | 94 | u64 open_devices; |
2b82032c YZ |
95 | u64 rw_devices; |
96 | u64 total_rw_bytes; | |
8a4b83cc | 97 | struct block_device *latest_bdev; |
e5e9a520 CM |
98 | |
99 | /* all of the devices in the FS, protected by a mutex | |
100 | * so we can safely walk it to write out the supers without | |
101 | * worrying about add/remove by the multi-device code | |
102 | */ | |
103 | struct mutex device_list_mutex; | |
8a4b83cc | 104 | struct list_head devices; |
b3075717 CM |
105 | |
106 | /* devices not currently being allocated */ | |
107 | struct list_head alloc_list; | |
8a4b83cc | 108 | struct list_head list; |
2b82032c YZ |
109 | |
110 | struct btrfs_fs_devices *seed; | |
111 | int seeding; | |
2b82032c YZ |
112 | |
113 | int opened; | |
c289811c CM |
114 | |
115 | /* set when we find or add a device that doesn't have the | |
116 | * nonrot flag set | |
117 | */ | |
118 | int rotating; | |
8a4b83cc CM |
119 | }; |
120 | ||
cea9e445 CM |
121 | struct btrfs_bio_stripe { |
122 | struct btrfs_device *dev; | |
123 | u64 physical; | |
124 | }; | |
125 | ||
126 | struct btrfs_multi_bio { | |
127 | atomic_t stripes_pending; | |
128 | bio_end_io_t *end_io; | |
7d2b4daa | 129 | struct bio *orig_bio; |
cea9e445 | 130 | void *private; |
a236aed1 CM |
131 | atomic_t error; |
132 | int max_errors; | |
cea9e445 CM |
133 | int num_stripes; |
134 | struct btrfs_bio_stripe stripes[]; | |
135 | }; | |
136 | ||
137 | #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ | |
138 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
139 | ||
0b86a832 CM |
140 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
141 | struct btrfs_device *device, | |
e17cade2 | 142 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 143 | u64 chunk_offset, u64 start, u64 num_bytes); |
cea9e445 CM |
144 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
145 | u64 logical, u64 *length, | |
f188591e | 146 | struct btrfs_multi_bio **multi_ret, int mirror_num); |
a512bbf8 YZ |
147 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
148 | u64 chunk_start, u64 physical, u64 devid, | |
149 | u64 **logical, int *naddrs, int *stripe_len); | |
e4404d6e | 150 | int btrfs_read_sys_array(struct btrfs_root *root); |
0b86a832 CM |
151 | int btrfs_read_chunk_tree(struct btrfs_root *root); |
152 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2b82032c | 153 | struct btrfs_root *extent_root, u64 type); |
0b86a832 CM |
154 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
155 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e | 156 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 157 | int mirror_num, int async_submit); |
0d81ba5d | 158 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); |
8a4b83cc | 159 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
97288f2c CH |
160 | fmode_t flags, void *holder); |
161 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, | |
8a4b83cc CM |
162 | struct btrfs_fs_devices **fs_devices_ret); |
163 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
dfe25020 | 164 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); |
8a4b83cc CM |
165 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
166 | struct btrfs_root *root, | |
167 | struct btrfs_device *device); | |
a061fc8d | 168 | int btrfs_rm_device(struct btrfs_root *root, char *device_path); |
8a4b83cc | 169 | int btrfs_cleanup_fs_uuids(void); |
f188591e | 170 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
f2d8d74d CM |
171 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
172 | u64 logical, struct page *page); | |
8f18cf13 CM |
173 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
174 | struct btrfs_device *device, u64 new_size); | |
175 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
2b82032c | 176 | u8 *uuid, u8 *fsid); |
8f18cf13 | 177 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); |
788f20eb | 178 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
ec44a35c | 179 | int btrfs_balance(struct btrfs_root *dev_root); |
a061fc8d CM |
180 | void btrfs_unlock_volumes(void); |
181 | void btrfs_lock_volumes(void); | |
2b82032c | 182 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); |
ba1bf481 JB |
183 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
184 | struct btrfs_device *device, u64 num_bytes, | |
185 | u64 *start, u64 *max_avail); | |
0b86a832 | 186 | #endif |