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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; |
d5e2003c | 51 | int can_discard; |
b3075717 | 52 | |
8790d502 | 53 | spinlock_t io_lock; |
0b86a832 CM |
54 | |
55 | struct block_device *bdev; | |
56 | ||
d4d77629 | 57 | /* the mode sent to blkdev_get */ |
15916de8 CM |
58 | fmode_t mode; |
59 | ||
8a4b83cc CM |
60 | char *name; |
61 | ||
0b86a832 CM |
62 | /* the internal btrfs device id */ |
63 | u64 devid; | |
64 | ||
65 | /* size of the device */ | |
66 | u64 total_bytes; | |
67 | ||
d6397bae CB |
68 | /* size of the disk */ |
69 | u64 disk_total_bytes; | |
70 | ||
0b86a832 CM |
71 | /* bytes used */ |
72 | u64 bytes_used; | |
73 | ||
74 | /* optimal io alignment for this device */ | |
75 | u32 io_align; | |
76 | ||
77 | /* optimal io width for this device */ | |
78 | u32 io_width; | |
79 | ||
80 | /* minimal io size for this device */ | |
81 | u32 sector_size; | |
82 | ||
0b86a832 CM |
83 | /* type and info about this device */ |
84 | u64 type; | |
85 | ||
0b86a832 | 86 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 87 | u8 uuid[BTRFS_UUID_SIZE]; |
8b712842 | 88 | |
a2de733c AJ |
89 | /* per-device scrub information */ |
90 | struct scrub_dev *scrub_device; | |
91 | ||
8b712842 | 92 | struct btrfs_work work; |
1f78160c XG |
93 | struct rcu_head rcu; |
94 | struct work_struct rcu_work; | |
90519d66 AJ |
95 | |
96 | /* readahead state */ | |
97 | spinlock_t reada_lock; | |
98 | atomic_t reada_in_flight; | |
99 | u64 reada_next; | |
100 | struct reada_zone *reada_curr_zone; | |
101 | struct radix_tree_root reada_zones; | |
102 | struct radix_tree_root reada_extents; | |
387125fc CM |
103 | |
104 | /* for sending down flush barriers */ | |
105 | struct bio *flush_bio; | |
106 | struct completion flush_wait; | |
107 | int nobarriers; | |
108 | ||
0b86a832 CM |
109 | }; |
110 | ||
8a4b83cc CM |
111 | struct btrfs_fs_devices { |
112 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
113 | ||
d4a78947 | 114 | /* the device with this id has the most recent copy of the super */ |
8a4b83cc CM |
115 | u64 latest_devid; |
116 | u64 latest_trans; | |
8a4b83cc | 117 | u64 num_devices; |
a0af469b | 118 | u64 open_devices; |
2b82032c | 119 | u64 rw_devices; |
cd02dca5 | 120 | u64 missing_devices; |
2b82032c | 121 | u64 total_rw_bytes; |
d5e2003c | 122 | u64 num_can_discard; |
8a4b83cc | 123 | struct block_device *latest_bdev; |
e5e9a520 CM |
124 | |
125 | /* all of the devices in the FS, protected by a mutex | |
126 | * so we can safely walk it to write out the supers without | |
127 | * worrying about add/remove by the multi-device code | |
128 | */ | |
129 | struct mutex device_list_mutex; | |
8a4b83cc | 130 | struct list_head devices; |
b3075717 CM |
131 | |
132 | /* devices not currently being allocated */ | |
133 | struct list_head alloc_list; | |
8a4b83cc | 134 | struct list_head list; |
2b82032c YZ |
135 | |
136 | struct btrfs_fs_devices *seed; | |
137 | int seeding; | |
2b82032c YZ |
138 | |
139 | int opened; | |
c289811c CM |
140 | |
141 | /* set when we find or add a device that doesn't have the | |
142 | * nonrot flag set | |
143 | */ | |
144 | int rotating; | |
8a4b83cc CM |
145 | }; |
146 | ||
cea9e445 CM |
147 | struct btrfs_bio_stripe { |
148 | struct btrfs_device *dev; | |
149 | u64 physical; | |
fce3bb9a | 150 | u64 length; /* only used for discard mappings */ |
cea9e445 CM |
151 | }; |
152 | ||
a1d3c478 JS |
153 | struct btrfs_bio; |
154 | typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); | |
155 | ||
156 | struct btrfs_bio { | |
cea9e445 CM |
157 | atomic_t stripes_pending; |
158 | bio_end_io_t *end_io; | |
7d2b4daa | 159 | struct bio *orig_bio; |
cea9e445 | 160 | void *private; |
a236aed1 CM |
161 | atomic_t error; |
162 | int max_errors; | |
cea9e445 | 163 | int num_stripes; |
a1d3c478 | 164 | int mirror_num; |
cea9e445 CM |
165 | struct btrfs_bio_stripe stripes[]; |
166 | }; | |
167 | ||
b2117a39 MX |
168 | struct btrfs_device_info { |
169 | struct btrfs_device *dev; | |
170 | u64 dev_offset; | |
171 | u64 max_avail; | |
73c5de00 | 172 | u64 total_avail; |
b2117a39 MX |
173 | }; |
174 | ||
1abe9b8a | 175 | struct map_lookup { |
176 | u64 type; | |
177 | int io_align; | |
178 | int io_width; | |
179 | int stripe_len; | |
180 | int sector_size; | |
181 | int num_stripes; | |
182 | int sub_stripes; | |
183 | struct btrfs_bio_stripe stripes[]; | |
184 | }; | |
185 | ||
a2de733c AJ |
186 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
187 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
188 | ||
f43ffb60 ID |
189 | /* |
190 | * Restriper's general type filter | |
191 | */ | |
192 | #define BTRFS_BALANCE_DATA (1ULL << 0) | |
193 | #define BTRFS_BALANCE_SYSTEM (1ULL << 1) | |
194 | #define BTRFS_BALANCE_METADATA (1ULL << 2) | |
195 | ||
196 | #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \ | |
197 | BTRFS_BALANCE_SYSTEM | \ | |
198 | BTRFS_BALANCE_METADATA) | |
e4d8ec0f ID |
199 | |
200 | #define BTRFS_BALANCE_FORCE (1ULL << 3) | |
59641015 | 201 | #define BTRFS_BALANCE_RESUME (1ULL << 4) |
e4d8ec0f | 202 | |
ed25e9b2 ID |
203 | /* |
204 | * Balance filters | |
205 | */ | |
206 | #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0) | |
5ce5b3c0 | 207 | #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) |
409d404b | 208 | #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) |
94e60d5a | 209 | #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) |
ea67176a | 210 | #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) |
f43ffb60 | 211 | |
cfa4c961 ID |
212 | /* |
213 | * Profile changing flags. When SOFT is set we won't relocate chunk if | |
214 | * it already has the target profile (even though it may be | |
215 | * half-filled). | |
216 | */ | |
e4d8ec0f | 217 | #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8) |
cfa4c961 | 218 | #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9) |
e4d8ec0f | 219 | |
c9e9f97b | 220 | struct btrfs_balance_args; |
19a39dce | 221 | struct btrfs_balance_progress; |
c9e9f97b ID |
222 | struct btrfs_balance_control { |
223 | struct btrfs_fs_info *fs_info; | |
224 | ||
225 | struct btrfs_balance_args data; | |
226 | struct btrfs_balance_args meta; | |
227 | struct btrfs_balance_args sys; | |
228 | ||
229 | u64 flags; | |
19a39dce ID |
230 | |
231 | struct btrfs_balance_progress stat; | |
c9e9f97b ID |
232 | }; |
233 | ||
6d07bcec MX |
234 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, |
235 | u64 end, u64 *length); | |
236 | ||
a1d3c478 | 237 | #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ |
cea9e445 CM |
238 | (sizeof(struct btrfs_bio_stripe) * (n))) |
239 | ||
0b86a832 CM |
240 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
241 | struct btrfs_device *device, | |
e17cade2 | 242 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 243 | u64 chunk_offset, u64 start, u64 num_bytes); |
cea9e445 CM |
244 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
245 | u64 logical, u64 *length, | |
a1d3c478 | 246 | struct btrfs_bio **bbio_ret, int mirror_num); |
a512bbf8 YZ |
247 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
248 | u64 chunk_start, u64 physical, u64 devid, | |
249 | u64 **logical, int *naddrs, int *stripe_len); | |
e4404d6e | 250 | int btrfs_read_sys_array(struct btrfs_root *root); |
0b86a832 CM |
251 | int btrfs_read_chunk_tree(struct btrfs_root *root); |
252 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2b82032c | 253 | struct btrfs_root *extent_root, u64 type); |
0b86a832 CM |
254 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
255 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e | 256 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 257 | int mirror_num, int async_submit); |
8a4b83cc | 258 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
97288f2c CH |
259 | fmode_t flags, void *holder); |
260 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, | |
8a4b83cc CM |
261 | struct btrfs_fs_devices **fs_devices_ret); |
262 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
143bede5 | 263 | void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); |
8a4b83cc CM |
264 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
265 | struct btrfs_root *root, | |
266 | struct btrfs_device *device); | |
a061fc8d | 267 | int btrfs_rm_device(struct btrfs_root *root, char *device_path); |
143bede5 | 268 | void btrfs_cleanup_fs_uuids(void); |
f188591e | 269 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
8f18cf13 CM |
270 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
271 | struct btrfs_device *device, u64 new_size); | |
272 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
2b82032c | 273 | u8 *uuid, u8 *fsid); |
8f18cf13 | 274 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); |
788f20eb | 275 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
c9e9f97b ID |
276 | int btrfs_balance(struct btrfs_balance_control *bctl, |
277 | struct btrfs_ioctl_balance_args *bargs); | |
59641015 | 278 | int btrfs_recover_balance(struct btrfs_root *tree_root); |
837d5b6e | 279 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info); |
a7e99c69 | 280 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); |
2b82032c | 281 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); |
125ccb0a | 282 | int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, |
ba1bf481 | 283 | u64 *start, u64 *max_avail); |
0b86a832 | 284 | #endif |