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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" |
442a4f63 | 25 | #include "ioctl.h" |
cea9e445 | 26 | |
b2117a39 MX |
27 | #define BTRFS_STRIPE_LEN (64 * 1024) |
28 | ||
f2984462 | 29 | struct buffer_head; |
ffbd517d CM |
30 | struct btrfs_pending_bios { |
31 | struct bio *head; | |
32 | struct bio *tail; | |
33 | }; | |
34 | ||
0b86a832 CM |
35 | struct btrfs_device { |
36 | struct list_head dev_list; | |
b3075717 | 37 | struct list_head dev_alloc_list; |
2b82032c | 38 | struct btrfs_fs_devices *fs_devices; |
0b86a832 | 39 | struct btrfs_root *dev_root; |
ffbd517d CM |
40 | |
41 | /* regular prio bios */ | |
42 | struct btrfs_pending_bios pending_bios; | |
43 | /* WRITE_SYNC bios */ | |
44 | struct btrfs_pending_bios pending_sync_bios; | |
45 | ||
8b712842 | 46 | int running_pending; |
dfe25020 | 47 | u64 generation; |
b3075717 | 48 | |
2b82032c | 49 | int writeable; |
dfe25020 | 50 | int in_fs_metadata; |
cd02dca5 | 51 | int missing; |
d5e2003c | 52 | int can_discard; |
b3075717 | 53 | |
8790d502 | 54 | spinlock_t io_lock; |
0b86a832 CM |
55 | |
56 | struct block_device *bdev; | |
57 | ||
d4d77629 | 58 | /* the mode sent to blkdev_get */ |
15916de8 CM |
59 | fmode_t mode; |
60 | ||
606686ee | 61 | struct rcu_string *name; |
8a4b83cc | 62 | |
0b86a832 CM |
63 | /* the internal btrfs device id */ |
64 | u64 devid; | |
65 | ||
66 | /* size of the device */ | |
67 | u64 total_bytes; | |
68 | ||
d6397bae CB |
69 | /* size of the disk */ |
70 | u64 disk_total_bytes; | |
71 | ||
0b86a832 CM |
72 | /* bytes used */ |
73 | u64 bytes_used; | |
74 | ||
75 | /* optimal io alignment for this device */ | |
76 | u32 io_align; | |
77 | ||
78 | /* optimal io width for this device */ | |
79 | u32 io_width; | |
80 | ||
81 | /* minimal io size for this device */ | |
82 | u32 sector_size; | |
83 | ||
0b86a832 CM |
84 | /* type and info about this device */ |
85 | u64 type; | |
86 | ||
0b86a832 | 87 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 88 | u8 uuid[BTRFS_UUID_SIZE]; |
8b712842 | 89 | |
a2de733c AJ |
90 | /* per-device scrub information */ |
91 | struct scrub_dev *scrub_device; | |
92 | ||
8b712842 | 93 | struct btrfs_work work; |
1f78160c XG |
94 | struct rcu_head rcu; |
95 | struct work_struct rcu_work; | |
90519d66 AJ |
96 | |
97 | /* readahead state */ | |
98 | spinlock_t reada_lock; | |
99 | atomic_t reada_in_flight; | |
100 | u64 reada_next; | |
101 | struct reada_zone *reada_curr_zone; | |
102 | struct radix_tree_root reada_zones; | |
103 | struct radix_tree_root reada_extents; | |
387125fc CM |
104 | |
105 | /* for sending down flush barriers */ | |
106 | struct bio *flush_bio; | |
107 | struct completion flush_wait; | |
108 | int nobarriers; | |
109 | ||
442a4f63 SB |
110 | /* disk I/O failure stats. For detailed description refer to |
111 | * enum btrfs_dev_stat_values in ioctl.h */ | |
733f4fbb | 112 | int dev_stats_valid; |
442a4f63 SB |
113 | int dev_stats_dirty; /* counters need to be written to disk */ |
114 | atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; | |
0b86a832 CM |
115 | }; |
116 | ||
8a4b83cc CM |
117 | struct btrfs_fs_devices { |
118 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
119 | ||
d4a78947 | 120 | /* the device with this id has the most recent copy of the super */ |
8a4b83cc CM |
121 | u64 latest_devid; |
122 | u64 latest_trans; | |
8a4b83cc | 123 | u64 num_devices; |
a0af469b | 124 | u64 open_devices; |
2b82032c | 125 | u64 rw_devices; |
cd02dca5 | 126 | u64 missing_devices; |
2b82032c | 127 | u64 total_rw_bytes; |
d5e2003c | 128 | u64 num_can_discard; |
8a4b83cc | 129 | struct block_device *latest_bdev; |
e5e9a520 CM |
130 | |
131 | /* all of the devices in the FS, protected by a mutex | |
132 | * so we can safely walk it to write out the supers without | |
133 | * worrying about add/remove by the multi-device code | |
134 | */ | |
135 | struct mutex device_list_mutex; | |
8a4b83cc | 136 | struct list_head devices; |
b3075717 CM |
137 | |
138 | /* devices not currently being allocated */ | |
139 | struct list_head alloc_list; | |
8a4b83cc | 140 | struct list_head list; |
2b82032c YZ |
141 | |
142 | struct btrfs_fs_devices *seed; | |
143 | int seeding; | |
2b82032c YZ |
144 | |
145 | int opened; | |
c289811c CM |
146 | |
147 | /* set when we find or add a device that doesn't have the | |
148 | * nonrot flag set | |
149 | */ | |
150 | int rotating; | |
8a4b83cc CM |
151 | }; |
152 | ||
cea9e445 CM |
153 | struct btrfs_bio_stripe { |
154 | struct btrfs_device *dev; | |
155 | u64 physical; | |
fce3bb9a | 156 | u64 length; /* only used for discard mappings */ |
cea9e445 CM |
157 | }; |
158 | ||
a1d3c478 JS |
159 | struct btrfs_bio; |
160 | typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); | |
161 | ||
162 | struct btrfs_bio { | |
cea9e445 CM |
163 | atomic_t stripes_pending; |
164 | bio_end_io_t *end_io; | |
7d2b4daa | 165 | struct bio *orig_bio; |
cea9e445 | 166 | void *private; |
a236aed1 CM |
167 | atomic_t error; |
168 | int max_errors; | |
cea9e445 | 169 | int num_stripes; |
a1d3c478 | 170 | int mirror_num; |
cea9e445 CM |
171 | struct btrfs_bio_stripe stripes[]; |
172 | }; | |
173 | ||
b2117a39 MX |
174 | struct btrfs_device_info { |
175 | struct btrfs_device *dev; | |
176 | u64 dev_offset; | |
177 | u64 max_avail; | |
73c5de00 | 178 | u64 total_avail; |
b2117a39 MX |
179 | }; |
180 | ||
1abe9b8a | 181 | struct map_lookup { |
182 | u64 type; | |
183 | int io_align; | |
184 | int io_width; | |
185 | int stripe_len; | |
186 | int sector_size; | |
187 | int num_stripes; | |
188 | int sub_stripes; | |
189 | struct btrfs_bio_stripe stripes[]; | |
190 | }; | |
191 | ||
a2de733c AJ |
192 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
193 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
194 | ||
f43ffb60 ID |
195 | /* |
196 | * Restriper's general type filter | |
197 | */ | |
198 | #define BTRFS_BALANCE_DATA (1ULL << 0) | |
199 | #define BTRFS_BALANCE_SYSTEM (1ULL << 1) | |
200 | #define BTRFS_BALANCE_METADATA (1ULL << 2) | |
201 | ||
202 | #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \ | |
203 | BTRFS_BALANCE_SYSTEM | \ | |
204 | BTRFS_BALANCE_METADATA) | |
e4d8ec0f ID |
205 | |
206 | #define BTRFS_BALANCE_FORCE (1ULL << 3) | |
59641015 | 207 | #define BTRFS_BALANCE_RESUME (1ULL << 4) |
e4d8ec0f | 208 | |
ed25e9b2 ID |
209 | /* |
210 | * Balance filters | |
211 | */ | |
212 | #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0) | |
5ce5b3c0 | 213 | #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) |
409d404b | 214 | #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) |
94e60d5a | 215 | #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) |
ea67176a | 216 | #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) |
f43ffb60 | 217 | |
cfa4c961 ID |
218 | /* |
219 | * Profile changing flags. When SOFT is set we won't relocate chunk if | |
220 | * it already has the target profile (even though it may be | |
221 | * half-filled). | |
222 | */ | |
e4d8ec0f | 223 | #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8) |
cfa4c961 | 224 | #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9) |
e4d8ec0f | 225 | |
c9e9f97b | 226 | struct btrfs_balance_args; |
19a39dce | 227 | struct btrfs_balance_progress; |
c9e9f97b ID |
228 | struct btrfs_balance_control { |
229 | struct btrfs_fs_info *fs_info; | |
230 | ||
231 | struct btrfs_balance_args data; | |
232 | struct btrfs_balance_args meta; | |
233 | struct btrfs_balance_args sys; | |
234 | ||
235 | u64 flags; | |
19a39dce ID |
236 | |
237 | struct btrfs_balance_progress stat; | |
c9e9f97b ID |
238 | }; |
239 | ||
6d07bcec MX |
240 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, |
241 | u64 end, u64 *length); | |
242 | ||
a1d3c478 | 243 | #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ |
cea9e445 CM |
244 | (sizeof(struct btrfs_bio_stripe) * (n))) |
245 | ||
0b86a832 CM |
246 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
247 | struct btrfs_device *device, | |
e17cade2 | 248 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 249 | u64 chunk_offset, u64 start, u64 num_bytes); |
cea9e445 CM |
250 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
251 | u64 logical, u64 *length, | |
a1d3c478 | 252 | struct btrfs_bio **bbio_ret, int mirror_num); |
a512bbf8 YZ |
253 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
254 | u64 chunk_start, u64 physical, u64 devid, | |
255 | u64 **logical, int *naddrs, int *stripe_len); | |
e4404d6e | 256 | int btrfs_read_sys_array(struct btrfs_root *root); |
0b86a832 CM |
257 | int btrfs_read_chunk_tree(struct btrfs_root *root); |
258 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2b82032c | 259 | struct btrfs_root *extent_root, u64 type); |
0b86a832 CM |
260 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
261 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e | 262 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 263 | int mirror_num, int async_submit); |
8a4b83cc | 264 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
97288f2c CH |
265 | fmode_t flags, void *holder); |
266 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, | |
8a4b83cc CM |
267 | struct btrfs_fs_devices **fs_devices_ret); |
268 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
143bede5 | 269 | void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); |
8a4b83cc CM |
270 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
271 | struct btrfs_root *root, | |
272 | struct btrfs_device *device); | |
a061fc8d | 273 | int btrfs_rm_device(struct btrfs_root *root, char *device_path); |
143bede5 | 274 | void btrfs_cleanup_fs_uuids(void); |
f188591e | 275 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
8f18cf13 CM |
276 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
277 | struct btrfs_device *device, u64 new_size); | |
278 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
2b82032c | 279 | u8 *uuid, u8 *fsid); |
8f18cf13 | 280 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); |
788f20eb | 281 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
c9e9f97b ID |
282 | int btrfs_balance(struct btrfs_balance_control *bctl, |
283 | struct btrfs_ioctl_balance_args *bargs); | |
2b6ba629 | 284 | int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); |
68310a5e | 285 | int btrfs_recover_balance(struct btrfs_fs_info *fs_info); |
837d5b6e | 286 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info); |
a7e99c69 | 287 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); |
2b82032c | 288 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); |
125ccb0a | 289 | int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, |
ba1bf481 | 290 | u64 *start, u64 *max_avail); |
442a4f63 SB |
291 | struct btrfs_device *btrfs_find_device_for_logical(struct btrfs_root *root, |
292 | u64 logical, int mirror_num); | |
293 | void btrfs_dev_stat_print_on_error(struct btrfs_device *device); | |
294 | void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); | |
c11d2c23 SB |
295 | int btrfs_get_dev_stats(struct btrfs_root *root, |
296 | struct btrfs_ioctl_get_dev_stats *stats, | |
297 | int reset_after_read); | |
733f4fbb SB |
298 | int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); |
299 | int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, | |
300 | struct btrfs_fs_info *fs_info); | |
442a4f63 SB |
301 | |
302 | static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, | |
303 | int index) | |
304 | { | |
305 | atomic_inc(dev->dev_stat_values + index); | |
306 | dev->dev_stats_dirty = 1; | |
307 | } | |
308 | ||
309 | static inline int btrfs_dev_stat_read(struct btrfs_device *dev, | |
310 | int index) | |
311 | { | |
312 | return atomic_read(dev->dev_stat_values + index); | |
313 | } | |
314 | ||
315 | static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, | |
316 | int index) | |
317 | { | |
318 | int ret; | |
319 | ||
320 | ret = atomic_xchg(dev->dev_stat_values + index, 0); | |
321 | dev->dev_stats_dirty = 1; | |
322 | return ret; | |
323 | } | |
324 | ||
325 | static inline void btrfs_dev_stat_set(struct btrfs_device *dev, | |
326 | int index, unsigned long val) | |
327 | { | |
328 | atomic_set(dev->dev_stat_values + index, val); | |
329 | dev->dev_stats_dirty = 1; | |
330 | } | |
331 | ||
332 | static inline void btrfs_dev_stat_reset(struct btrfs_device *dev, | |
333 | int index) | |
334 | { | |
335 | btrfs_dev_stat_set(dev, index, 0); | |
336 | } | |
0b86a832 | 337 | #endif |