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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> |
b2117a39 | 23 | #include <linux/sort.h> |
8b712842 | 24 | #include "async-thread.h" |
cea9e445 | 25 | |
b2117a39 MX |
26 | #define BTRFS_STRIPE_LEN (64 * 1024) |
27 | ||
f2984462 | 28 | struct buffer_head; |
ffbd517d CM |
29 | struct btrfs_pending_bios { |
30 | struct bio *head; | |
31 | struct bio *tail; | |
32 | }; | |
33 | ||
0b86a832 CM |
34 | struct btrfs_device { |
35 | struct list_head dev_list; | |
b3075717 | 36 | struct list_head dev_alloc_list; |
2b82032c | 37 | struct btrfs_fs_devices *fs_devices; |
0b86a832 | 38 | struct btrfs_root *dev_root; |
ffbd517d CM |
39 | |
40 | /* regular prio bios */ | |
41 | struct btrfs_pending_bios pending_bios; | |
42 | /* WRITE_SYNC bios */ | |
43 | struct btrfs_pending_bios pending_sync_bios; | |
44 | ||
8b712842 | 45 | int running_pending; |
dfe25020 | 46 | u64 generation; |
b3075717 | 47 | |
2b82032c | 48 | int writeable; |
dfe25020 | 49 | int in_fs_metadata; |
cd02dca5 | 50 | int missing; |
b3075717 | 51 | |
8790d502 | 52 | spinlock_t io_lock; |
0b86a832 CM |
53 | |
54 | struct block_device *bdev; | |
55 | ||
d4d77629 | 56 | /* the mode sent to blkdev_get */ |
15916de8 CM |
57 | fmode_t mode; |
58 | ||
8a4b83cc CM |
59 | char *name; |
60 | ||
0b86a832 CM |
61 | /* the internal btrfs device id */ |
62 | u64 devid; | |
63 | ||
64 | /* size of the device */ | |
65 | u64 total_bytes; | |
66 | ||
d6397bae CB |
67 | /* size of the disk */ |
68 | u64 disk_total_bytes; | |
69 | ||
0b86a832 CM |
70 | /* bytes used */ |
71 | u64 bytes_used; | |
72 | ||
73 | /* optimal io alignment for this device */ | |
74 | u32 io_align; | |
75 | ||
76 | /* optimal io width for this device */ | |
77 | u32 io_width; | |
78 | ||
79 | /* minimal io size for this device */ | |
80 | u32 sector_size; | |
81 | ||
0b86a832 CM |
82 | /* type and info about this device */ |
83 | u64 type; | |
84 | ||
0b86a832 | 85 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 86 | u8 uuid[BTRFS_UUID_SIZE]; |
8b712842 | 87 | |
a2de733c AJ |
88 | /* per-device scrub information */ |
89 | struct scrub_dev *scrub_device; | |
90 | ||
8b712842 | 91 | struct btrfs_work work; |
0b86a832 CM |
92 | }; |
93 | ||
8a4b83cc CM |
94 | struct btrfs_fs_devices { |
95 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
96 | ||
d4a78947 | 97 | /* the device with this id has the most recent copy of the super */ |
8a4b83cc CM |
98 | u64 latest_devid; |
99 | u64 latest_trans; | |
8a4b83cc | 100 | u64 num_devices; |
a0af469b | 101 | u64 open_devices; |
2b82032c | 102 | u64 rw_devices; |
cd02dca5 | 103 | u64 missing_devices; |
2b82032c | 104 | u64 total_rw_bytes; |
8a4b83cc | 105 | struct block_device *latest_bdev; |
e5e9a520 CM |
106 | |
107 | /* all of the devices in the FS, protected by a mutex | |
108 | * so we can safely walk it to write out the supers without | |
109 | * worrying about add/remove by the multi-device code | |
110 | */ | |
111 | struct mutex device_list_mutex; | |
8a4b83cc | 112 | struct list_head devices; |
b3075717 CM |
113 | |
114 | /* devices not currently being allocated */ | |
115 | struct list_head alloc_list; | |
8a4b83cc | 116 | struct list_head list; |
2b82032c YZ |
117 | |
118 | struct btrfs_fs_devices *seed; | |
119 | int seeding; | |
2b82032c YZ |
120 | |
121 | int opened; | |
c289811c CM |
122 | |
123 | /* set when we find or add a device that doesn't have the | |
124 | * nonrot flag set | |
125 | */ | |
126 | int rotating; | |
8a4b83cc CM |
127 | }; |
128 | ||
cea9e445 CM |
129 | struct btrfs_bio_stripe { |
130 | struct btrfs_device *dev; | |
131 | u64 physical; | |
fce3bb9a | 132 | u64 length; /* only used for discard mappings */ |
cea9e445 CM |
133 | }; |
134 | ||
135 | struct btrfs_multi_bio { | |
136 | atomic_t stripes_pending; | |
137 | bio_end_io_t *end_io; | |
7d2b4daa | 138 | struct bio *orig_bio; |
cea9e445 | 139 | void *private; |
a236aed1 CM |
140 | atomic_t error; |
141 | int max_errors; | |
cea9e445 CM |
142 | int num_stripes; |
143 | struct btrfs_bio_stripe stripes[]; | |
144 | }; | |
145 | ||
b2117a39 MX |
146 | struct btrfs_device_info { |
147 | struct btrfs_device *dev; | |
148 | u64 dev_offset; | |
149 | u64 max_avail; | |
150 | }; | |
151 | ||
1abe9b8a | 152 | struct map_lookup { |
153 | u64 type; | |
154 | int io_align; | |
155 | int io_width; | |
156 | int stripe_len; | |
157 | int sector_size; | |
158 | int num_stripes; | |
159 | int sub_stripes; | |
160 | struct btrfs_bio_stripe stripes[]; | |
161 | }; | |
162 | ||
a2de733c AJ |
163 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
164 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
165 | ||
b2117a39 MX |
166 | /* Used to sort the devices by max_avail(descending sort) */ |
167 | int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2); | |
168 | ||
169 | /* | |
170 | * sort the devices by max_avail, in which max free extent size of each device | |
171 | * is stored.(Descending Sort) | |
172 | */ | |
173 | static inline void btrfs_descending_sort_devices( | |
174 | struct btrfs_device_info *devices, | |
175 | size_t nr_devices) | |
176 | { | |
177 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
178 | btrfs_cmp_device_free_bytes, NULL); | |
179 | } | |
180 | ||
6d07bcec MX |
181 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, |
182 | u64 end, u64 *length); | |
183 | ||
cea9e445 CM |
184 | #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ |
185 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
186 | ||
0b86a832 CM |
187 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
188 | struct btrfs_device *device, | |
e17cade2 | 189 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 190 | u64 chunk_offset, u64 start, u64 num_bytes); |
cea9e445 CM |
191 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
192 | u64 logical, u64 *length, | |
f188591e | 193 | struct btrfs_multi_bio **multi_ret, int mirror_num); |
a512bbf8 YZ |
194 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
195 | u64 chunk_start, u64 physical, u64 devid, | |
196 | u64 **logical, int *naddrs, int *stripe_len); | |
e4404d6e | 197 | int btrfs_read_sys_array(struct btrfs_root *root); |
0b86a832 CM |
198 | int btrfs_read_chunk_tree(struct btrfs_root *root); |
199 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2b82032c | 200 | struct btrfs_root *extent_root, u64 type); |
0b86a832 CM |
201 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
202 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e | 203 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 204 | int mirror_num, int async_submit); |
0d81ba5d | 205 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); |
8a4b83cc | 206 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
97288f2c CH |
207 | fmode_t flags, void *holder); |
208 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, | |
8a4b83cc CM |
209 | struct btrfs_fs_devices **fs_devices_ret); |
210 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
dfe25020 | 211 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); |
8a4b83cc CM |
212 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
213 | struct btrfs_root *root, | |
214 | struct btrfs_device *device); | |
a061fc8d | 215 | int btrfs_rm_device(struct btrfs_root *root, char *device_path); |
8a4b83cc | 216 | int btrfs_cleanup_fs_uuids(void); |
f188591e | 217 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
f2d8d74d CM |
218 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
219 | u64 logical, struct page *page); | |
8f18cf13 CM |
220 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
221 | struct btrfs_device *device, u64 new_size); | |
222 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
2b82032c | 223 | u8 *uuid, u8 *fsid); |
8f18cf13 | 224 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); |
788f20eb | 225 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
ec44a35c | 226 | int btrfs_balance(struct btrfs_root *dev_root); |
a061fc8d CM |
227 | void btrfs_unlock_volumes(void); |
228 | void btrfs_lock_volumes(void); | |
2b82032c | 229 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); |
ba1bf481 JB |
230 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
231 | struct btrfs_device *device, u64 num_bytes, | |
232 | u64 *start, u64 *max_avail); | |
0b86a832 | 233 | #endif |