Commit | Line | Data |
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3bd94003 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2003 Sistina Software Limited. | |
1f965b19 | 4 | * Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
5 | * |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
06386bbf | 9 | #include "dm-bio-record.h" |
1da177e4 | 10 | |
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/mempool.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/slab.h> | |
1da177e4 | 16 | #include <linux/workqueue.h> |
1f965b19 | 17 | #include <linux/device-mapper.h> |
a765e20e AK |
18 | #include <linux/dm-io.h> |
19 | #include <linux/dm-dirty-log.h> | |
20 | #include <linux/dm-kcopyd.h> | |
1f965b19 | 21 | #include <linux/dm-region-hash.h> |
1da177e4 | 22 | |
a7e8f7fb TH |
23 | static struct workqueue_struct *dm_raid1_wq; |
24 | ||
72d94861 | 25 | #define DM_MSG_PREFIX "raid1" |
1f965b19 HM |
26 | |
27 | #define MAX_RECOVERY 1 /* Maximum number of regions recovered in parallel. */ | |
72d94861 | 28 | |
65972a6f KC |
29 | #define MAX_NR_MIRRORS (DM_KCOPYD_MAX_REGIONS + 1) |
30 | ||
ed63287d LZ |
31 | #define DM_RAID1_HANDLE_ERRORS 0x01 |
32 | #define DM_RAID1_KEEP_LOG 0x02 | |
f44db678 | 33 | #define errors_handled(p) ((p)->features & DM_RAID1_HANDLE_ERRORS) |
ed63287d | 34 | #define keep_log(p) ((p)->features & DM_RAID1_KEEP_LOG) |
a8e6afa2 | 35 | |
33184048 | 36 | static DECLARE_WAIT_QUEUE_HEAD(_kmirrord_recovery_stopped); |
1da177e4 | 37 | |
a4a82ce3 HM |
38 | /* |
39 | *--------------------------------------------------------------- | |
e4c8b3ba | 40 | * Mirror set structures. |
a4a82ce3 HM |
41 | *--------------------------------------------------------------- |
42 | */ | |
72f4b314 JB |
43 | enum dm_raid1_error { |
44 | DM_RAID1_WRITE_ERROR, | |
64b30c46 | 45 | DM_RAID1_FLUSH_ERROR, |
72f4b314 JB |
46 | DM_RAID1_SYNC_ERROR, |
47 | DM_RAID1_READ_ERROR | |
48 | }; | |
49 | ||
e4c8b3ba | 50 | struct mirror { |
aa5617c5 | 51 | struct mirror_set *ms; |
e4c8b3ba | 52 | atomic_t error_count; |
39ed7adb | 53 | unsigned long error_type; |
e4c8b3ba NB |
54 | struct dm_dev *dev; |
55 | sector_t offset; | |
56 | }; | |
57 | ||
58 | struct mirror_set { | |
59 | struct dm_target *ti; | |
60 | struct list_head list; | |
1f965b19 | 61 | |
a8e6afa2 | 62 | uint64_t features; |
e4c8b3ba | 63 | |
72f4b314 | 64 | spinlock_t lock; /* protects the lists */ |
e4c8b3ba NB |
65 | struct bio_list reads; |
66 | struct bio_list writes; | |
72f4b314 | 67 | struct bio_list failures; |
04788507 | 68 | struct bio_list holds; /* bios are waiting until suspend */ |
e4c8b3ba | 69 | |
1f965b19 HM |
70 | struct dm_region_hash *rh; |
71 | struct dm_kcopyd_client *kcopyd_client; | |
88be163a MB |
72 | struct dm_io_client *io_client; |
73 | ||
e4c8b3ba NB |
74 | /* recovery */ |
75 | region_t nr_regions; | |
76 | int in_sync; | |
fc1ff958 | 77 | int log_failure; |
929be8fc | 78 | int leg_failure; |
b80aa7a0 | 79 | atomic_t suspend; |
e4c8b3ba | 80 | |
72f4b314 | 81 | atomic_t default_mirror; /* Default mirror */ |
e4c8b3ba | 82 | |
6ad36fe2 HS |
83 | struct workqueue_struct *kmirrord_wq; |
84 | struct work_struct kmirrord_work; | |
a2aebe03 MP |
85 | struct timer_list timer; |
86 | unsigned long timer_pending; | |
87 | ||
72f4b314 | 88 | struct work_struct trigger_event; |
6ad36fe2 | 89 | |
86a3238c | 90 | unsigned int nr_mirrors; |
b18ae8dd | 91 | struct mirror mirror[]; |
e4c8b3ba NB |
92 | }; |
93 | ||
df5d2e90 MP |
94 | DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(raid1_resync_throttle, |
95 | "A percentage of time allocated for raid resynchronization"); | |
96 | ||
1f965b19 | 97 | static void wakeup_mirrord(void *context) |
1da177e4 | 98 | { |
1f965b19 | 99 | struct mirror_set *ms = context; |
1da177e4 | 100 | |
6ad36fe2 HS |
101 | queue_work(ms->kmirrord_wq, &ms->kmirrord_work); |
102 | } | |
103 | ||
8376d3c1 | 104 | static void delayed_wake_fn(struct timer_list *t) |
a2aebe03 | 105 | { |
8376d3c1 | 106 | struct mirror_set *ms = from_timer(ms, t, timer); |
a2aebe03 MP |
107 | |
108 | clear_bit(0, &ms->timer_pending); | |
1f965b19 | 109 | wakeup_mirrord(ms); |
a2aebe03 MP |
110 | } |
111 | ||
112 | static void delayed_wake(struct mirror_set *ms) | |
113 | { | |
114 | if (test_and_set_bit(0, &ms->timer_pending)) | |
115 | return; | |
116 | ||
117 | ms->timer.expires = jiffies + HZ / 5; | |
a2aebe03 MP |
118 | add_timer(&ms->timer); |
119 | } | |
120 | ||
1f965b19 | 121 | static void wakeup_all_recovery_waiters(void *context) |
1da177e4 | 122 | { |
1f965b19 | 123 | wake_up_all(&_kmirrord_recovery_stopped); |
1da177e4 LT |
124 | } |
125 | ||
1f965b19 | 126 | static void queue_bio(struct mirror_set *ms, struct bio *bio, int rw) |
1da177e4 LT |
127 | { |
128 | unsigned long flags; | |
1da177e4 | 129 | int should_wake = 0; |
1f965b19 | 130 | struct bio_list *bl; |
1da177e4 | 131 | |
1f965b19 HM |
132 | bl = (rw == WRITE) ? &ms->writes : &ms->reads; |
133 | spin_lock_irqsave(&ms->lock, flags); | |
134 | should_wake = !(bl->head); | |
135 | bio_list_add(bl, bio); | |
136 | spin_unlock_irqrestore(&ms->lock, flags); | |
1da177e4 LT |
137 | |
138 | if (should_wake) | |
1f965b19 | 139 | wakeup_mirrord(ms); |
1da177e4 LT |
140 | } |
141 | ||
1f965b19 | 142 | static void dispatch_bios(void *context, struct bio_list *bio_list) |
1da177e4 | 143 | { |
1f965b19 HM |
144 | struct mirror_set *ms = context; |
145 | struct bio *bio; | |
1da177e4 | 146 | |
1f965b19 HM |
147 | while ((bio = bio_list_pop(bio_list))) |
148 | queue_bio(ms, bio, WRITE); | |
1da177e4 LT |
149 | } |
150 | ||
89c7cd89 | 151 | struct dm_raid1_bio_record { |
06386bbf | 152 | struct mirror *m; |
309dca30 | 153 | /* if details->bi_bdev == NULL, details were not saved */ |
06386bbf | 154 | struct dm_bio_details details; |
0045d61b | 155 | region_t write_region; |
06386bbf JB |
156 | }; |
157 | ||
1da177e4 LT |
158 | /* |
159 | * Every mirror should look like this one. | |
160 | */ | |
161 | #define DEFAULT_MIRROR 0 | |
162 | ||
163 | /* | |
06386bbf JB |
164 | * This is yucky. We squirrel the mirror struct away inside |
165 | * bi_next for read/write buffers. This is safe since the bh | |
1da177e4 LT |
166 | * doesn't get submitted to the lower levels of block layer. |
167 | */ | |
06386bbf | 168 | static struct mirror *bio_get_m(struct bio *bio) |
1da177e4 | 169 | { |
06386bbf | 170 | return (struct mirror *) bio->bi_next; |
1da177e4 LT |
171 | } |
172 | ||
06386bbf | 173 | static void bio_set_m(struct bio *bio, struct mirror *m) |
1da177e4 | 174 | { |
06386bbf | 175 | bio->bi_next = (struct bio *) m; |
1da177e4 LT |
176 | } |
177 | ||
72f4b314 JB |
178 | static struct mirror *get_default_mirror(struct mirror_set *ms) |
179 | { | |
180 | return &ms->mirror[atomic_read(&ms->default_mirror)]; | |
181 | } | |
182 | ||
183 | static void set_default_mirror(struct mirror *m) | |
184 | { | |
185 | struct mirror_set *ms = m->ms; | |
186 | struct mirror *m0 = &(ms->mirror[0]); | |
187 | ||
188 | atomic_set(&ms->default_mirror, m - m0); | |
189 | } | |
190 | ||
87968ddd MP |
191 | static struct mirror *get_valid_mirror(struct mirror_set *ms) |
192 | { | |
193 | struct mirror *m; | |
194 | ||
195 | for (m = ms->mirror; m < ms->mirror + ms->nr_mirrors; m++) | |
196 | if (!atomic_read(&m->error_count)) | |
197 | return m; | |
198 | ||
199 | return NULL; | |
200 | } | |
201 | ||
72f4b314 JB |
202 | /* fail_mirror |
203 | * @m: mirror device to fail | |
204 | * @error_type: one of the enum's, DM_RAID1_*_ERROR | |
205 | * | |
206 | * If errors are being handled, record the type of | |
207 | * error encountered for this device. If this type | |
208 | * of error has already been recorded, we can return; | |
209 | * otherwise, we must signal userspace by triggering | |
210 | * an event. Additionally, if the device is the | |
211 | * primary device, we must choose a new primary, but | |
212 | * only if the mirror is in-sync. | |
213 | * | |
214 | * This function must not block. | |
215 | */ | |
216 | static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type) | |
217 | { | |
218 | struct mirror_set *ms = m->ms; | |
219 | struct mirror *new; | |
220 | ||
929be8fc MP |
221 | ms->leg_failure = 1; |
222 | ||
72f4b314 JB |
223 | /* |
224 | * error_count is used for nothing more than a | |
225 | * simple way to tell if a device has encountered | |
226 | * errors. | |
227 | */ | |
228 | atomic_inc(&m->error_count); | |
229 | ||
230 | if (test_and_set_bit(error_type, &m->error_type)) | |
231 | return; | |
232 | ||
d460c65a JB |
233 | if (!errors_handled(ms)) |
234 | return; | |
235 | ||
72f4b314 JB |
236 | if (m != get_default_mirror(ms)) |
237 | goto out; | |
238 | ||
ed63287d | 239 | if (!ms->in_sync && !keep_log(ms)) { |
72f4b314 JB |
240 | /* |
241 | * Better to issue requests to same failing device | |
242 | * than to risk returning corrupt data. | |
243 | */ | |
2e84fecf HM |
244 | DMERR("Primary mirror (%s) failed while out-of-sync: Reads may fail.", |
245 | m->dev->name); | |
72f4b314 JB |
246 | goto out; |
247 | } | |
248 | ||
87968ddd MP |
249 | new = get_valid_mirror(ms); |
250 | if (new) | |
251 | set_default_mirror(new); | |
252 | else | |
72f4b314 JB |
253 | DMWARN("All sides of mirror have failed."); |
254 | ||
255 | out: | |
a7e8f7fb | 256 | queue_work(dm_raid1_wq, &ms->trigger_event); |
72f4b314 JB |
257 | } |
258 | ||
c0da3748 MP |
259 | static int mirror_flush(struct dm_target *ti) |
260 | { | |
261 | struct mirror_set *ms = ti->private; | |
262 | unsigned long error_bits; | |
263 | ||
264 | unsigned int i; | |
65972a6f | 265 | struct dm_io_region io[MAX_NR_MIRRORS]; |
c0da3748 MP |
266 | struct mirror *m; |
267 | struct dm_io_request io_req = { | |
581075e4 | 268 | .bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC, |
c0da3748 | 269 | .mem.type = DM_IO_KMEM, |
5fc2ffea | 270 | .mem.ptr.addr = NULL, |
c0da3748 MP |
271 | .client = ms->io_client, |
272 | }; | |
273 | ||
274 | for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) { | |
275 | io[i].bdev = m->dev->bdev; | |
276 | io[i].sector = 0; | |
277 | io[i].count = 0; | |
278 | } | |
279 | ||
280 | error_bits = -1; | |
281 | dm_io(&io_req, ms->nr_mirrors, io, &error_bits); | |
282 | if (unlikely(error_bits != 0)) { | |
283 | for (i = 0; i < ms->nr_mirrors; i++) | |
284 | if (test_bit(i, &error_bits)) | |
285 | fail_mirror(ms->mirror + i, | |
64b30c46 | 286 | DM_RAID1_FLUSH_ERROR); |
c0da3748 MP |
287 | return -EIO; |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
a4a82ce3 HM |
293 | /* |
294 | *--------------------------------------------------------------- | |
1da177e4 LT |
295 | * Recovery. |
296 | * | |
297 | * When a mirror is first activated we may find that some regions | |
298 | * are in the no-sync state. We have to recover these by | |
299 | * recopying from the default mirror to all the others. | |
a4a82ce3 HM |
300 | *--------------------------------------------------------------- |
301 | */ | |
4cdc1d1f | 302 | static void recovery_complete(int read_err, unsigned long write_err, |
1da177e4 LT |
303 | void *context) |
304 | { | |
1f965b19 HM |
305 | struct dm_region *reg = context; |
306 | struct mirror_set *ms = dm_rh_region_context(reg); | |
8f0205b7 | 307 | int m, bit = 0; |
1da177e4 | 308 | |
8f0205b7 | 309 | if (read_err) { |
f44db678 JB |
310 | /* Read error means the failure of default mirror. */ |
311 | DMERR_LIMIT("Unable to read primary mirror during recovery"); | |
8f0205b7 JB |
312 | fail_mirror(get_default_mirror(ms), DM_RAID1_SYNC_ERROR); |
313 | } | |
f44db678 | 314 | |
8f0205b7 | 315 | if (write_err) { |
4cdc1d1f | 316 | DMERR_LIMIT("Write error during recovery (error = 0x%lx)", |
f44db678 | 317 | write_err); |
8f0205b7 JB |
318 | /* |
319 | * Bits correspond to devices (excluding default mirror). | |
320 | * The default mirror cannot change during recovery. | |
321 | */ | |
322 | for (m = 0; m < ms->nr_mirrors; m++) { | |
323 | if (&ms->mirror[m] == get_default_mirror(ms)) | |
324 | continue; | |
325 | if (test_bit(bit, &write_err)) | |
326 | fail_mirror(ms->mirror + m, | |
327 | DM_RAID1_SYNC_ERROR); | |
328 | bit++; | |
329 | } | |
330 | } | |
f44db678 | 331 | |
1f965b19 | 332 | dm_rh_recovery_end(reg, !(read_err || write_err)); |
1da177e4 LT |
333 | } |
334 | ||
7209049d | 335 | static void recover(struct mirror_set *ms, struct dm_region *reg) |
1da177e4 | 336 | { |
86a3238c | 337 | unsigned int i; |
eb69aca5 | 338 | struct dm_io_region from, to[DM_KCOPYD_MAX_REGIONS], *dest; |
1da177e4 LT |
339 | struct mirror *m; |
340 | unsigned long flags = 0; | |
1f965b19 HM |
341 | region_t key = dm_rh_get_region_key(reg); |
342 | sector_t region_size = dm_rh_get_region_size(ms->rh); | |
1da177e4 LT |
343 | |
344 | /* fill in the source */ | |
72f4b314 | 345 | m = get_default_mirror(ms); |
1da177e4 | 346 | from.bdev = m->dev->bdev; |
1f965b19 HM |
347 | from.sector = m->offset + dm_rh_region_to_sector(ms->rh, key); |
348 | if (key == (ms->nr_regions - 1)) { | |
1da177e4 LT |
349 | /* |
350 | * The final region may be smaller than | |
351 | * region_size. | |
352 | */ | |
1f965b19 | 353 | from.count = ms->ti->len & (region_size - 1); |
1da177e4 | 354 | if (!from.count) |
1f965b19 | 355 | from.count = region_size; |
1da177e4 | 356 | } else |
1f965b19 | 357 | from.count = region_size; |
1da177e4 LT |
358 | |
359 | /* fill in the destinations */ | |
360 | for (i = 0, dest = to; i < ms->nr_mirrors; i++) { | |
72f4b314 | 361 | if (&ms->mirror[i] == get_default_mirror(ms)) |
1da177e4 LT |
362 | continue; |
363 | ||
364 | m = ms->mirror + i; | |
365 | dest->bdev = m->dev->bdev; | |
1f965b19 | 366 | dest->sector = m->offset + dm_rh_region_to_sector(ms->rh, key); |
1da177e4 LT |
367 | dest->count = from.count; |
368 | dest++; | |
369 | } | |
370 | ||
371 | /* hand to kcopyd */ | |
f7c83e2e | 372 | if (!errors_handled(ms)) |
db2351eb | 373 | flags |= BIT(DM_KCOPYD_IGNORE_ERROR); |
f7c83e2e | 374 | |
7209049d MS |
375 | dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, |
376 | flags, recovery_complete, reg); | |
1da177e4 LT |
377 | } |
378 | ||
ed63287d LZ |
379 | static void reset_ms_flags(struct mirror_set *ms) |
380 | { | |
381 | unsigned int m; | |
382 | ||
383 | ms->leg_failure = 0; | |
384 | for (m = 0; m < ms->nr_mirrors; m++) { | |
385 | atomic_set(&(ms->mirror[m].error_count), 0); | |
386 | ms->mirror[m].error_type = 0; | |
387 | } | |
388 | } | |
389 | ||
1da177e4 LT |
390 | static void do_recovery(struct mirror_set *ms) |
391 | { | |
1f965b19 HM |
392 | struct dm_region *reg; |
393 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); | |
1da177e4 LT |
394 | |
395 | /* | |
396 | * Start quiescing some regions. | |
397 | */ | |
1f965b19 | 398 | dm_rh_recovery_prepare(ms->rh); |
1da177e4 LT |
399 | |
400 | /* | |
401 | * Copy any already quiesced regions. | |
402 | */ | |
7209049d MS |
403 | while ((reg = dm_rh_recovery_start(ms->rh))) |
404 | recover(ms, reg); | |
1da177e4 LT |
405 | |
406 | /* | |
407 | * Update the in sync flag. | |
408 | */ | |
409 | if (!ms->in_sync && | |
410 | (log->type->get_sync_count(log) == ms->nr_regions)) { | |
411 | /* the sync is complete */ | |
412 | dm_table_event(ms->ti->table); | |
413 | ms->in_sync = 1; | |
ed63287d | 414 | reset_ms_flags(ms); |
1da177e4 LT |
415 | } |
416 | } | |
417 | ||
a4a82ce3 HM |
418 | /* |
419 | *--------------------------------------------------------------- | |
1da177e4 | 420 | * Reads |
a4a82ce3 HM |
421 | *--------------------------------------------------------------- |
422 | */ | |
1da177e4 LT |
423 | static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) |
424 | { | |
06386bbf JB |
425 | struct mirror *m = get_default_mirror(ms); |
426 | ||
427 | do { | |
428 | if (likely(!atomic_read(&m->error_count))) | |
429 | return m; | |
430 | ||
431 | if (m-- == ms->mirror) | |
432 | m += ms->nr_mirrors; | |
433 | } while (m != get_default_mirror(ms)); | |
434 | ||
435 | return NULL; | |
436 | } | |
437 | ||
438 | static int default_ok(struct mirror *m) | |
439 | { | |
440 | struct mirror *default_mirror = get_default_mirror(m->ms); | |
441 | ||
442 | return !atomic_read(&default_mirror->error_count); | |
443 | } | |
444 | ||
445 | static int mirror_available(struct mirror_set *ms, struct bio *bio) | |
446 | { | |
1f965b19 HM |
447 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
448 | region_t region = dm_rh_bio_to_region(ms->rh, bio); | |
06386bbf | 449 | |
1f965b19 | 450 | if (log->type->in_sync(log, region, 0)) |
4f024f37 | 451 | return choose_mirror(ms, bio->bi_iter.bi_sector) ? 1 : 0; |
06386bbf JB |
452 | |
453 | return 0; | |
1da177e4 LT |
454 | } |
455 | ||
456 | /* | |
457 | * remap a buffer to a particular mirror. | |
458 | */ | |
06386bbf JB |
459 | static sector_t map_sector(struct mirror *m, struct bio *bio) |
460 | { | |
4f024f37 | 461 | if (unlikely(!bio->bi_iter.bi_size)) |
4184153f | 462 | return 0; |
4f024f37 | 463 | return m->offset + dm_target_offset(m->ms->ti, bio->bi_iter.bi_sector); |
06386bbf JB |
464 | } |
465 | ||
466 | static void map_bio(struct mirror *m, struct bio *bio) | |
1da177e4 | 467 | { |
74d46992 | 468 | bio_set_dev(bio, m->dev->bdev); |
4f024f37 | 469 | bio->bi_iter.bi_sector = map_sector(m, bio); |
06386bbf JB |
470 | } |
471 | ||
22a1ceb1 | 472 | static void map_region(struct dm_io_region *io, struct mirror *m, |
06386bbf JB |
473 | struct bio *bio) |
474 | { | |
475 | io->bdev = m->dev->bdev; | |
476 | io->sector = map_sector(m, bio); | |
aa8b57aa | 477 | io->count = bio_sectors(bio); |
06386bbf JB |
478 | } |
479 | ||
04788507 MP |
480 | static void hold_bio(struct mirror_set *ms, struct bio *bio) |
481 | { | |
482 | /* | |
f0703040 TY |
483 | * Lock is required to avoid race condition during suspend |
484 | * process. | |
04788507 | 485 | */ |
f0703040 TY |
486 | spin_lock_irq(&ms->lock); |
487 | ||
04788507 | 488 | if (atomic_read(&ms->suspend)) { |
f0703040 TY |
489 | spin_unlock_irq(&ms->lock); |
490 | ||
491 | /* | |
492 | * If device is suspended, complete the bio. | |
493 | */ | |
04788507 | 494 | if (dm_noflush_suspending(ms->ti)) |
4e4cbee9 | 495 | bio->bi_status = BLK_STS_DM_REQUEUE; |
04788507 | 496 | else |
4e4cbee9 | 497 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
498 | |
499 | bio_endio(bio); | |
04788507 MP |
500 | return; |
501 | } | |
502 | ||
503 | /* | |
504 | * Hold bio until the suspend is complete. | |
505 | */ | |
04788507 MP |
506 | bio_list_add(&ms->holds, bio); |
507 | spin_unlock_irq(&ms->lock); | |
508 | } | |
509 | ||
a4a82ce3 HM |
510 | /* |
511 | *--------------------------------------------------------------- | |
06386bbf | 512 | * Reads |
a4a82ce3 HM |
513 | *--------------------------------------------------------------- |
514 | */ | |
06386bbf JB |
515 | static void read_callback(unsigned long error, void *context) |
516 | { | |
517 | struct bio *bio = context; | |
518 | struct mirror *m; | |
519 | ||
520 | m = bio_get_m(bio); | |
521 | bio_set_m(bio, NULL); | |
522 | ||
523 | if (likely(!error)) { | |
4246a0b6 | 524 | bio_endio(bio); |
06386bbf JB |
525 | return; |
526 | } | |
527 | ||
528 | fail_mirror(m, DM_RAID1_READ_ERROR); | |
529 | ||
530 | if (likely(default_ok(m)) || mirror_available(m->ms, bio)) { | |
2e84fecf | 531 | DMWARN_LIMIT("Read failure on mirror device %s. Trying alternative device.", |
06386bbf | 532 | m->dev->name); |
70246286 | 533 | queue_bio(m->ms, bio, bio_data_dir(bio)); |
06386bbf JB |
534 | return; |
535 | } | |
536 | ||
537 | DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.", | |
538 | m->dev->name); | |
4246a0b6 | 539 | bio_io_error(bio); |
06386bbf JB |
540 | } |
541 | ||
542 | /* Asynchronous read. */ | |
543 | static void read_async_bio(struct mirror *m, struct bio *bio) | |
544 | { | |
22a1ceb1 | 545 | struct dm_io_region io; |
06386bbf | 546 | struct dm_io_request io_req = { |
581075e4 | 547 | .bi_opf = REQ_OP_READ, |
003b5c57 KO |
548 | .mem.type = DM_IO_BIO, |
549 | .mem.ptr.bio = bio, | |
06386bbf JB |
550 | .notify.fn = read_callback, |
551 | .notify.context = bio, | |
552 | .client = m->ms->io_client, | |
553 | }; | |
554 | ||
555 | map_region(&io, m, bio); | |
556 | bio_set_m(bio, m); | |
1f965b19 HM |
557 | BUG_ON(dm_io(&io_req, 1, &io, NULL)); |
558 | } | |
559 | ||
560 | static inline int region_in_sync(struct mirror_set *ms, region_t region, | |
561 | int may_block) | |
562 | { | |
563 | int state = dm_rh_get_state(ms->rh, region, may_block); | |
564 | return state == DM_RH_CLEAN || state == DM_RH_DIRTY; | |
1da177e4 LT |
565 | } |
566 | ||
567 | static void do_reads(struct mirror_set *ms, struct bio_list *reads) | |
568 | { | |
569 | region_t region; | |
570 | struct bio *bio; | |
571 | struct mirror *m; | |
572 | ||
573 | while ((bio = bio_list_pop(reads))) { | |
1f965b19 | 574 | region = dm_rh_bio_to_region(ms->rh, bio); |
06386bbf | 575 | m = get_default_mirror(ms); |
1da177e4 LT |
576 | |
577 | /* | |
578 | * We can only read balance if the region is in sync. | |
579 | */ | |
1f965b19 | 580 | if (likely(region_in_sync(ms, region, 1))) |
4f024f37 | 581 | m = choose_mirror(ms, bio->bi_iter.bi_sector); |
06386bbf JB |
582 | else if (m && atomic_read(&m->error_count)) |
583 | m = NULL; | |
1da177e4 | 584 | |
06386bbf JB |
585 | if (likely(m)) |
586 | read_async_bio(m, bio); | |
587 | else | |
4246a0b6 | 588 | bio_io_error(bio); |
1da177e4 LT |
589 | } |
590 | } | |
591 | ||
a4a82ce3 HM |
592 | /* |
593 | *--------------------------------------------------------------------- | |
1da177e4 LT |
594 | * Writes. |
595 | * | |
596 | * We do different things with the write io depending on the | |
597 | * state of the region that it's in: | |
598 | * | |
8ca817c4 | 599 | * SYNC: increment pending, use kcopyd to write to *all* mirrors |
1da177e4 LT |
600 | * RECOVERING: delay the io until recovery completes |
601 | * NOSYNC: increment pending, just write to the default mirror | |
a4a82ce3 HM |
602 | *--------------------------------------------------------------------- |
603 | */ | |
1da177e4 LT |
604 | static void write_callback(unsigned long error, void *context) |
605 | { | |
86a3238c | 606 | unsigned int i; |
26cb62a2 | 607 | struct bio *bio = context; |
1da177e4 | 608 | struct mirror_set *ms; |
72f4b314 JB |
609 | int should_wake = 0; |
610 | unsigned long flags; | |
1da177e4 | 611 | |
06386bbf JB |
612 | ms = bio_get_m(bio)->ms; |
613 | bio_set_m(bio, NULL); | |
1da177e4 LT |
614 | |
615 | /* | |
616 | * NOTE: We don't decrement the pending count here, | |
617 | * instead it is done by the targets endio function. | |
618 | * This way we handle both writes to SYNC and NOSYNC | |
619 | * regions with the same code. | |
620 | */ | |
60f355ea | 621 | if (likely(!error)) { |
4246a0b6 | 622 | bio_endio(bio); |
60f355ea MP |
623 | return; |
624 | } | |
1da177e4 | 625 | |
f2ed51ac MP |
626 | /* |
627 | * If the bio is discard, return an error, but do not | |
628 | * degrade the array. | |
629 | */ | |
e6047149 | 630 | if (bio_op(bio) == REQ_OP_DISCARD) { |
4e4cbee9 | 631 | bio->bi_status = BLK_STS_NOTSUPP; |
4246a0b6 | 632 | bio_endio(bio); |
f2ed51ac MP |
633 | return; |
634 | } | |
635 | ||
72f4b314 JB |
636 | for (i = 0; i < ms->nr_mirrors; i++) |
637 | if (test_bit(i, &error)) | |
638 | fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR); | |
72f4b314 | 639 | |
60f355ea MP |
640 | /* |
641 | * Need to raise event. Since raising | |
642 | * events can block, we need to do it in | |
643 | * the main thread. | |
644 | */ | |
645 | spin_lock_irqsave(&ms->lock, flags); | |
646 | if (!ms->failures.head) | |
647 | should_wake = 1; | |
648 | bio_list_add(&ms->failures, bio); | |
649 | spin_unlock_irqrestore(&ms->lock, flags); | |
650 | if (should_wake) | |
651 | wakeup_mirrord(ms); | |
1da177e4 LT |
652 | } |
653 | ||
654 | static void do_write(struct mirror_set *ms, struct bio *bio) | |
655 | { | |
656 | unsigned int i; | |
65972a6f | 657 | struct dm_io_region io[MAX_NR_MIRRORS], *dest = io; |
1da177e4 | 658 | struct mirror *m; |
581075e4 | 659 | blk_opf_t op_flags = bio->bi_opf & (REQ_FUA | REQ_PREFLUSH); |
88be163a | 660 | struct dm_io_request io_req = { |
581075e4 | 661 | .bi_opf = REQ_OP_WRITE | op_flags, |
003b5c57 KO |
662 | .mem.type = DM_IO_BIO, |
663 | .mem.ptr.bio = bio, | |
88be163a MB |
664 | .notify.fn = write_callback, |
665 | .notify.context = bio, | |
666 | .client = ms->io_client, | |
667 | }; | |
1da177e4 | 668 | |
e6047149 | 669 | if (bio_op(bio) == REQ_OP_DISCARD) { |
581075e4 | 670 | io_req.bi_opf = REQ_OP_DISCARD | op_flags; |
5fc2ffea MS |
671 | io_req.mem.type = DM_IO_KMEM; |
672 | io_req.mem.ptr.addr = NULL; | |
673 | } | |
674 | ||
06386bbf JB |
675 | for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) |
676 | map_region(dest++, m, bio); | |
1da177e4 | 677 | |
06386bbf JB |
678 | /* |
679 | * Use default mirror because we only need it to retrieve the reference | |
680 | * to the mirror set in write_callback(). | |
681 | */ | |
682 | bio_set_m(bio, get_default_mirror(ms)); | |
88be163a | 683 | |
1f965b19 | 684 | BUG_ON(dm_io(&io_req, ms->nr_mirrors, io, NULL)); |
1da177e4 LT |
685 | } |
686 | ||
687 | static void do_writes(struct mirror_set *ms, struct bio_list *writes) | |
688 | { | |
689 | int state; | |
690 | struct bio *bio; | |
691 | struct bio_list sync, nosync, recover, *this_list = NULL; | |
7513c2a7 JB |
692 | struct bio_list requeue; |
693 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); | |
694 | region_t region; | |
1da177e4 LT |
695 | |
696 | if (!writes->head) | |
697 | return; | |
698 | ||
699 | /* | |
700 | * Classify each write. | |
701 | */ | |
702 | bio_list_init(&sync); | |
703 | bio_list_init(&nosync); | |
704 | bio_list_init(&recover); | |
7513c2a7 | 705 | bio_list_init(&requeue); |
1da177e4 LT |
706 | |
707 | while ((bio = bio_list_pop(writes))) { | |
1eff9d32 | 708 | if ((bio->bi_opf & REQ_PREFLUSH) || |
e6047149 | 709 | (bio_op(bio) == REQ_OP_DISCARD)) { |
4184153f MP |
710 | bio_list_add(&sync, bio); |
711 | continue; | |
712 | } | |
713 | ||
7513c2a7 JB |
714 | region = dm_rh_bio_to_region(ms->rh, bio); |
715 | ||
716 | if (log->type->is_remote_recovering && | |
717 | log->type->is_remote_recovering(log, region)) { | |
718 | bio_list_add(&requeue, bio); | |
719 | continue; | |
720 | } | |
721 | ||
722 | state = dm_rh_get_state(ms->rh, region, 1); | |
1da177e4 | 723 | switch (state) { |
1f965b19 HM |
724 | case DM_RH_CLEAN: |
725 | case DM_RH_DIRTY: | |
1da177e4 LT |
726 | this_list = &sync; |
727 | break; | |
728 | ||
1f965b19 | 729 | case DM_RH_NOSYNC: |
1da177e4 LT |
730 | this_list = &nosync; |
731 | break; | |
732 | ||
1f965b19 | 733 | case DM_RH_RECOVERING: |
1da177e4 LT |
734 | this_list = &recover; |
735 | break; | |
736 | } | |
737 | ||
738 | bio_list_add(this_list, bio); | |
739 | } | |
740 | ||
7513c2a7 JB |
741 | /* |
742 | * Add bios that are delayed due to remote recovery | |
743 | * back on to the write queue | |
744 | */ | |
745 | if (unlikely(requeue.head)) { | |
746 | spin_lock_irq(&ms->lock); | |
747 | bio_list_merge(&ms->writes, &requeue); | |
748 | spin_unlock_irq(&ms->lock); | |
69885683 | 749 | delayed_wake(ms); |
7513c2a7 JB |
750 | } |
751 | ||
1da177e4 LT |
752 | /* |
753 | * Increment the pending counts for any regions that will | |
754 | * be written to (writes to recover regions are going to | |
755 | * be delayed). | |
756 | */ | |
1f965b19 HM |
757 | dm_rh_inc_pending(ms->rh, &sync); |
758 | dm_rh_inc_pending(ms->rh, &nosync); | |
d2b69864 JB |
759 | |
760 | /* | |
761 | * If the flush fails on a previous call and succeeds here, | |
762 | * we must not reset the log_failure variable. We need | |
763 | * userspace interaction to do that. | |
764 | */ | |
765 | ms->log_failure = dm_rh_flush(ms->rh) ? 1 : ms->log_failure; | |
1da177e4 LT |
766 | |
767 | /* | |
768 | * Dispatch io. | |
769 | */ | |
5528d17d | 770 | if (unlikely(ms->log_failure) && errors_handled(ms)) { |
b80aa7a0 JB |
771 | spin_lock_irq(&ms->lock); |
772 | bio_list_merge(&ms->failures, &sync); | |
773 | spin_unlock_irq(&ms->lock); | |
1f965b19 | 774 | wakeup_mirrord(ms); |
b80aa7a0 | 775 | } else |
fc1ff958 | 776 | while ((bio = bio_list_pop(&sync))) |
b80aa7a0 | 777 | do_write(ms, bio); |
1da177e4 LT |
778 | |
779 | while ((bio = bio_list_pop(&recover))) | |
1f965b19 | 780 | dm_rh_delay(ms->rh, bio); |
1da177e4 LT |
781 | |
782 | while ((bio = bio_list_pop(&nosync))) { | |
ed63287d | 783 | if (unlikely(ms->leg_failure) && errors_handled(ms) && !keep_log(ms)) { |
ede5ea0b MP |
784 | spin_lock_irq(&ms->lock); |
785 | bio_list_add(&ms->failures, bio); | |
786 | spin_unlock_irq(&ms->lock); | |
787 | wakeup_mirrord(ms); | |
788 | } else { | |
929be8fc | 789 | map_bio(get_default_mirror(ms), bio); |
ed00aabd | 790 | submit_bio_noacct(bio); |
929be8fc | 791 | } |
1da177e4 LT |
792 | } |
793 | } | |
794 | ||
72f4b314 JB |
795 | static void do_failures(struct mirror_set *ms, struct bio_list *failures) |
796 | { | |
797 | struct bio *bio; | |
798 | ||
0f398a84 | 799 | if (likely(!failures->head)) |
72f4b314 JB |
800 | return; |
801 | ||
b80aa7a0 JB |
802 | /* |
803 | * If the log has failed, unattempted writes are being | |
0f398a84 | 804 | * put on the holds list. We can't issue those writes |
b80aa7a0 JB |
805 | * until a log has been marked, so we must store them. |
806 | * | |
807 | * If a 'noflush' suspend is in progress, we can requeue | |
808 | * the I/O's to the core. This give userspace a chance | |
809 | * to reconfigure the mirror, at which point the core | |
810 | * will reissue the writes. If the 'noflush' flag is | |
811 | * not set, we have no choice but to return errors. | |
812 | * | |
813 | * Some writes on the failures list may have been | |
814 | * submitted before the log failure and represent a | |
815 | * failure to write to one of the devices. It is ok | |
816 | * for us to treat them the same and requeue them | |
817 | * as well. | |
818 | */ | |
0f398a84 | 819 | while ((bio = bio_list_pop(failures))) { |
60f355ea | 820 | if (!ms->log_failure) { |
0f398a84 | 821 | ms->in_sync = 0; |
c58098be | 822 | dm_rh_mark_nosync(ms->rh, bio); |
0f398a84 | 823 | } |
60f355ea MP |
824 | |
825 | /* | |
826 | * If all the legs are dead, fail the I/O. | |
ed63287d LZ |
827 | * If the device has failed and keep_log is enabled, |
828 | * fail the I/O. | |
829 | * | |
830 | * If we have been told to handle errors, and keep_log | |
831 | * isn't enabled, hold the bio and wait for userspace to | |
832 | * deal with the problem. | |
833 | * | |
60f355ea MP |
834 | * Otherwise pretend that the I/O succeeded. (This would |
835 | * be wrong if the failed leg returned after reboot and | |
836 | * got replicated back to the good legs.) | |
837 | */ | |
ed63287d | 838 | if (unlikely(!get_valid_mirror(ms) || (keep_log(ms) && ms->log_failure))) |
4246a0b6 | 839 | bio_io_error(bio); |
ed63287d | 840 | else if (errors_handled(ms) && !keep_log(ms)) |
60f355ea MP |
841 | hold_bio(ms, bio); |
842 | else | |
4246a0b6 | 843 | bio_endio(bio); |
b80aa7a0 | 844 | } |
72f4b314 JB |
845 | } |
846 | ||
847 | static void trigger_event(struct work_struct *work) | |
848 | { | |
849 | struct mirror_set *ms = | |
850 | container_of(work, struct mirror_set, trigger_event); | |
851 | ||
852 | dm_table_event(ms->ti->table); | |
853 | } | |
854 | ||
a4a82ce3 HM |
855 | /* |
856 | *--------------------------------------------------------------- | |
1da177e4 | 857 | * kmirrord |
a4a82ce3 HM |
858 | *--------------------------------------------------------------- |
859 | */ | |
a2aebe03 | 860 | static void do_mirror(struct work_struct *work) |
1da177e4 | 861 | { |
1f965b19 HM |
862 | struct mirror_set *ms = container_of(work, struct mirror_set, |
863 | kmirrord_work); | |
72f4b314 JB |
864 | struct bio_list reads, writes, failures; |
865 | unsigned long flags; | |
1da177e4 | 866 | |
72f4b314 | 867 | spin_lock_irqsave(&ms->lock, flags); |
1da177e4 LT |
868 | reads = ms->reads; |
869 | writes = ms->writes; | |
72f4b314 | 870 | failures = ms->failures; |
1da177e4 LT |
871 | bio_list_init(&ms->reads); |
872 | bio_list_init(&ms->writes); | |
72f4b314 JB |
873 | bio_list_init(&ms->failures); |
874 | spin_unlock_irqrestore(&ms->lock, flags); | |
1da177e4 | 875 | |
1f965b19 | 876 | dm_rh_update_states(ms->rh, errors_handled(ms)); |
1da177e4 LT |
877 | do_recovery(ms); |
878 | do_reads(ms, &reads); | |
879 | do_writes(ms, &writes); | |
72f4b314 | 880 | do_failures(ms, &failures); |
1da177e4 LT |
881 | } |
882 | ||
a4a82ce3 HM |
883 | /* |
884 | *--------------------------------------------------------------- | |
1da177e4 | 885 | * Target functions |
a4a82ce3 HM |
886 | *--------------------------------------------------------------- |
887 | */ | |
1da177e4 LT |
888 | static struct mirror_set *alloc_context(unsigned int nr_mirrors, |
889 | uint32_t region_size, | |
890 | struct dm_target *ti, | |
416cd17b | 891 | struct dm_dirty_log *dl) |
1da177e4 | 892 | { |
bcd67654 GS |
893 | struct mirror_set *ms = |
894 | kzalloc(struct_size(ms, mirror, nr_mirrors), GFP_KERNEL); | |
1da177e4 | 895 | |
1da177e4 | 896 | if (!ms) { |
72d94861 | 897 | ti->error = "Cannot allocate mirror context"; |
1da177e4 LT |
898 | return NULL; |
899 | } | |
900 | ||
1da177e4 | 901 | spin_lock_init(&ms->lock); |
5339fc2d MP |
902 | bio_list_init(&ms->reads); |
903 | bio_list_init(&ms->writes); | |
904 | bio_list_init(&ms->failures); | |
905 | bio_list_init(&ms->holds); | |
1da177e4 LT |
906 | |
907 | ms->ti = ti; | |
908 | ms->nr_mirrors = nr_mirrors; | |
909 | ms->nr_regions = dm_sector_div_up(ti->len, region_size); | |
910 | ms->in_sync = 0; | |
b80aa7a0 | 911 | ms->log_failure = 0; |
929be8fc | 912 | ms->leg_failure = 0; |
b80aa7a0 | 913 | atomic_set(&ms->suspend, 0); |
72f4b314 | 914 | atomic_set(&ms->default_mirror, DEFAULT_MIRROR); |
1da177e4 | 915 | |
bda8efec | 916 | ms->io_client = dm_io_client_create(); |
88be163a MB |
917 | if (IS_ERR(ms->io_client)) { |
918 | ti->error = "Error creating dm_io client"; | |
919 | kfree(ms); | |
255e2646 | 920 | return NULL; |
88be163a MB |
921 | } |
922 | ||
1f965b19 HM |
923 | ms->rh = dm_region_hash_create(ms, dispatch_bios, wakeup_mirrord, |
924 | wakeup_all_recovery_waiters, | |
925 | ms->ti->begin, MAX_RECOVERY, | |
926 | dl, region_size, ms->nr_regions); | |
927 | if (IS_ERR(ms->rh)) { | |
72d94861 | 928 | ti->error = "Error creating dirty region hash"; |
a72cf737 | 929 | dm_io_client_destroy(ms->io_client); |
1da177e4 LT |
930 | kfree(ms); |
931 | return NULL; | |
932 | } | |
933 | ||
934 | return ms; | |
935 | } | |
936 | ||
937 | static void free_context(struct mirror_set *ms, struct dm_target *ti, | |
938 | unsigned int m) | |
939 | { | |
940 | while (m--) | |
941 | dm_put_device(ti, ms->mirror[m].dev); | |
942 | ||
88be163a | 943 | dm_io_client_destroy(ms->io_client); |
1f965b19 | 944 | dm_region_hash_destroy(ms->rh); |
1da177e4 LT |
945 | kfree(ms); |
946 | } | |
947 | ||
1da177e4 LT |
948 | static int get_mirror(struct mirror_set *ms, struct dm_target *ti, |
949 | unsigned int mirror, char **argv) | |
950 | { | |
4ee218cd | 951 | unsigned long long offset; |
31998ef1 | 952 | char dummy; |
e80d1c80 | 953 | int ret; |
1da177e4 | 954 | |
ef87bfc2 MB |
955 | if (sscanf(argv[1], "%llu%c", &offset, &dummy) != 1 || |
956 | offset != (sector_t)offset) { | |
72d94861 | 957 | ti->error = "Invalid offset"; |
1da177e4 LT |
958 | return -EINVAL; |
959 | } | |
960 | ||
e80d1c80 VG |
961 | ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), |
962 | &ms->mirror[mirror].dev); | |
963 | if (ret) { | |
72d94861 | 964 | ti->error = "Device lookup failure"; |
e80d1c80 | 965 | return ret; |
1da177e4 LT |
966 | } |
967 | ||
aa5617c5 | 968 | ms->mirror[mirror].ms = ms; |
72f4b314 JB |
969 | atomic_set(&(ms->mirror[mirror].error_count), 0); |
970 | ms->mirror[mirror].error_type = 0; | |
1da177e4 LT |
971 | ms->mirror[mirror].offset = offset; |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
1da177e4 LT |
976 | /* |
977 | * Create dirty log: log_type #log_params <log_params> | |
978 | */ | |
416cd17b | 979 | static struct dm_dirty_log *create_dirty_log(struct dm_target *ti, |
86a3238c HM |
980 | unsigned int argc, char **argv, |
981 | unsigned int *args_used) | |
1da177e4 | 982 | { |
86a3238c | 983 | unsigned int param_count; |
416cd17b | 984 | struct dm_dirty_log *dl; |
31998ef1 | 985 | char dummy; |
1da177e4 LT |
986 | |
987 | if (argc < 2) { | |
72d94861 | 988 | ti->error = "Insufficient mirror log arguments"; |
1da177e4 LT |
989 | return NULL; |
990 | } | |
991 | ||
31998ef1 | 992 | if (sscanf(argv[1], "%u%c", ¶m_count, &dummy) != 1) { |
72d94861 | 993 | ti->error = "Invalid mirror log argument count"; |
1da177e4 LT |
994 | return NULL; |
995 | } | |
996 | ||
997 | *args_used = 2 + param_count; | |
998 | ||
999 | if (argc < *args_used) { | |
72d94861 | 1000 | ti->error = "Insufficient mirror log arguments"; |
1da177e4 LT |
1001 | return NULL; |
1002 | } | |
1003 | ||
c0da3748 MP |
1004 | dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count, |
1005 | argv + 2); | |
1da177e4 | 1006 | if (!dl) { |
72d94861 | 1007 | ti->error = "Error creating mirror dirty log"; |
1da177e4 LT |
1008 | return NULL; |
1009 | } | |
1010 | ||
1da177e4 LT |
1011 | return dl; |
1012 | } | |
1013 | ||
86a3238c HM |
1014 | static int parse_features(struct mirror_set *ms, unsigned int argc, char **argv, |
1015 | unsigned int *args_used) | |
a8e6afa2 | 1016 | { |
86a3238c | 1017 | unsigned int num_features; |
a8e6afa2 | 1018 | struct dm_target *ti = ms->ti; |
31998ef1 | 1019 | char dummy; |
ed63287d | 1020 | int i; |
a8e6afa2 JB |
1021 | |
1022 | *args_used = 0; | |
1023 | ||
1024 | if (!argc) | |
1025 | return 0; | |
1026 | ||
31998ef1 | 1027 | if (sscanf(argv[0], "%u%c", &num_features, &dummy) != 1) { |
a8e6afa2 JB |
1028 | ti->error = "Invalid number of features"; |
1029 | return -EINVAL; | |
1030 | } | |
1031 | ||
1032 | argc--; | |
1033 | argv++; | |
1034 | (*args_used)++; | |
1035 | ||
1036 | if (num_features > argc) { | |
1037 | ti->error = "Not enough arguments to support feature count"; | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
ed63287d LZ |
1041 | for (i = 0; i < num_features; i++) { |
1042 | if (!strcmp("handle_errors", argv[0])) | |
1043 | ms->features |= DM_RAID1_HANDLE_ERRORS; | |
1044 | else if (!strcmp("keep_log", argv[0])) | |
1045 | ms->features |= DM_RAID1_KEEP_LOG; | |
1046 | else { | |
1047 | ti->error = "Unrecognised feature requested"; | |
1048 | return -EINVAL; | |
1049 | } | |
1050 | ||
1051 | argc--; | |
1052 | argv++; | |
1053 | (*args_used)++; | |
1054 | } | |
1055 | if (!errors_handled(ms) && keep_log(ms)) { | |
1056 | ti->error = "keep_log feature requires the handle_errors feature"; | |
a8e6afa2 JB |
1057 | return -EINVAL; |
1058 | } | |
1059 | ||
a8e6afa2 JB |
1060 | return 0; |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | /* |
1064 | * Construct a mirror mapping: | |
1065 | * | |
1066 | * log_type #log_params <log_params> | |
1067 | * #mirrors [mirror_path offset]{2,} | |
a8e6afa2 | 1068 | * [#features <features>] |
1da177e4 LT |
1069 | * |
1070 | * log_type is "core" or "disk" | |
1071 | * #log_params is between 1 and 3 | |
a8e6afa2 | 1072 | * |
ed63287d | 1073 | * If present, supported features are "handle_errors" and "keep_log". |
1da177e4 | 1074 | */ |
1da177e4 LT |
1075 | static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
1076 | { | |
1077 | int r; | |
1078 | unsigned int nr_mirrors, m, args_used; | |
1079 | struct mirror_set *ms; | |
416cd17b | 1080 | struct dm_dirty_log *dl; |
31998ef1 | 1081 | char dummy; |
1da177e4 LT |
1082 | |
1083 | dl = create_dirty_log(ti, argc, argv, &args_used); | |
1084 | if (!dl) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | argv += args_used; | |
1088 | argc -= args_used; | |
1089 | ||
31998ef1 | 1090 | if (!argc || sscanf(argv[0], "%u%c", &nr_mirrors, &dummy) != 1 || |
65972a6f | 1091 | nr_mirrors < 2 || nr_mirrors > MAX_NR_MIRRORS) { |
72d94861 | 1092 | ti->error = "Invalid number of mirrors"; |
416cd17b | 1093 | dm_dirty_log_destroy(dl); |
1da177e4 LT |
1094 | return -EINVAL; |
1095 | } | |
1096 | ||
1097 | argv++, argc--; | |
1098 | ||
a8e6afa2 JB |
1099 | if (argc < nr_mirrors * 2) { |
1100 | ti->error = "Too few mirror arguments"; | |
416cd17b | 1101 | dm_dirty_log_destroy(dl); |
1da177e4 LT |
1102 | return -EINVAL; |
1103 | } | |
1104 | ||
1105 | ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl); | |
1106 | if (!ms) { | |
416cd17b | 1107 | dm_dirty_log_destroy(dl); |
1da177e4 LT |
1108 | return -ENOMEM; |
1109 | } | |
1110 | ||
1111 | /* Get the mirror parameter sets */ | |
1112 | for (m = 0; m < nr_mirrors; m++) { | |
1113 | r = get_mirror(ms, ti, m, argv); | |
1114 | if (r) { | |
1115 | free_context(ms, ti, m); | |
1116 | return r; | |
1117 | } | |
1118 | argv += 2; | |
1119 | argc -= 2; | |
1120 | } | |
1121 | ||
1122 | ti->private = ms; | |
542f9038 MS |
1123 | |
1124 | r = dm_set_target_max_io_len(ti, dm_rh_get_region_size(ms->rh)); | |
1125 | if (r) | |
1126 | goto err_free_context; | |
1127 | ||
55a62eef AK |
1128 | ti->num_flush_bios = 1; |
1129 | ti->num_discard_bios = 1; | |
30187e1d | 1130 | ti->per_io_data_size = sizeof(struct dm_raid1_bio_record); |
1da177e4 | 1131 | |
670368a8 | 1132 | ms->kmirrord_wq = alloc_workqueue("kmirrord", WQ_MEM_RECLAIM, 0); |
6ad36fe2 HS |
1133 | if (!ms->kmirrord_wq) { |
1134 | DMERR("couldn't start kmirrord"); | |
a72cf737 DM |
1135 | r = -ENOMEM; |
1136 | goto err_free_context; | |
6ad36fe2 HS |
1137 | } |
1138 | INIT_WORK(&ms->kmirrord_work, do_mirror); | |
8376d3c1 | 1139 | timer_setup(&ms->timer, delayed_wake_fn, 0); |
a2aebe03 | 1140 | ms->timer_pending = 0; |
72f4b314 | 1141 | INIT_WORK(&ms->trigger_event, trigger_event); |
6ad36fe2 | 1142 | |
a8e6afa2 | 1143 | r = parse_features(ms, argc, argv, &args_used); |
a72cf737 DM |
1144 | if (r) |
1145 | goto err_destroy_wq; | |
a8e6afa2 JB |
1146 | |
1147 | argv += args_used; | |
1148 | argc -= args_used; | |
1149 | ||
f44db678 JB |
1150 | /* |
1151 | * Any read-balancing addition depends on the | |
1152 | * DM_RAID1_HANDLE_ERRORS flag being present. | |
1153 | * This is because the decision to balance depends | |
1154 | * on the sync state of a region. If the above | |
1155 | * flag is not present, we ignore errors; and | |
1156 | * the sync state may be inaccurate. | |
1157 | */ | |
1158 | ||
a8e6afa2 JB |
1159 | if (argc) { |
1160 | ti->error = "Too many mirror arguments"; | |
a72cf737 DM |
1161 | r = -EINVAL; |
1162 | goto err_destroy_wq; | |
a8e6afa2 JB |
1163 | } |
1164 | ||
df5d2e90 | 1165 | ms->kcopyd_client = dm_kcopyd_client_create(&dm_kcopyd_throttle); |
fa34ce73 MP |
1166 | if (IS_ERR(ms->kcopyd_client)) { |
1167 | r = PTR_ERR(ms->kcopyd_client); | |
a72cf737 | 1168 | goto err_destroy_wq; |
fa34ce73 | 1169 | } |
1da177e4 | 1170 | |
1f965b19 | 1171 | wakeup_mirrord(ms); |
1da177e4 | 1172 | return 0; |
a72cf737 DM |
1173 | |
1174 | err_destroy_wq: | |
1175 | destroy_workqueue(ms->kmirrord_wq); | |
1176 | err_free_context: | |
1177 | free_context(ms, ti, ms->nr_mirrors); | |
1178 | return r; | |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | static void mirror_dtr(struct dm_target *ti) | |
1182 | { | |
26cb62a2 | 1183 | struct mirror_set *ms = ti->private; |
1da177e4 | 1184 | |
a2aebe03 | 1185 | del_timer_sync(&ms->timer); |
6ad36fe2 | 1186 | flush_workqueue(ms->kmirrord_wq); |
43829731 | 1187 | flush_work(&ms->trigger_event); |
eb69aca5 | 1188 | dm_kcopyd_client_destroy(ms->kcopyd_client); |
6ad36fe2 | 1189 | destroy_workqueue(ms->kmirrord_wq); |
1da177e4 LT |
1190 | free_context(ms, ti, ms->nr_mirrors); |
1191 | } | |
1192 | ||
1da177e4 LT |
1193 | /* |
1194 | * Mirror mapping function | |
1195 | */ | |
7de3ee57 | 1196 | static int mirror_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1197 | { |
70246286 | 1198 | int r, rw = bio_data_dir(bio); |
1da177e4 LT |
1199 | struct mirror *m; |
1200 | struct mirror_set *ms = ti->private; | |
1f965b19 | 1201 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
0045d61b MP |
1202 | struct dm_raid1_bio_record *bio_record = |
1203 | dm_per_bio_data(bio, sizeof(struct dm_raid1_bio_record)); | |
1204 | ||
309dca30 | 1205 | bio_record->details.bi_bdev = NULL; |
cd15fb64 | 1206 | |
1da177e4 | 1207 | if (rw == WRITE) { |
06386bbf | 1208 | /* Save region for mirror_end_io() handler */ |
0045d61b | 1209 | bio_record->write_region = dm_rh_bio_to_region(ms->rh, bio); |
1da177e4 | 1210 | queue_bio(ms, bio, rw); |
d2a7ad29 | 1211 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1212 | } |
1213 | ||
1f965b19 | 1214 | r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0); |
1da177e4 | 1215 | if (r < 0 && r != -EWOULDBLOCK) |
846785e6 | 1216 | return DM_MAPIO_KILL; |
1da177e4 | 1217 | |
1da177e4 | 1218 | /* |
06386bbf | 1219 | * If region is not in-sync queue the bio. |
1da177e4 | 1220 | */ |
06386bbf | 1221 | if (!r || (r == -EWOULDBLOCK)) { |
1eff9d32 | 1222 | if (bio->bi_opf & REQ_RAHEAD) |
846785e6 | 1223 | return DM_MAPIO_KILL; |
1da177e4 | 1224 | |
1da177e4 | 1225 | queue_bio(ms, bio, rw); |
d2a7ad29 | 1226 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1227 | } |
1228 | ||
06386bbf JB |
1229 | /* |
1230 | * The region is in-sync and we can perform reads directly. | |
1231 | * Store enough information so we can retry if it fails. | |
1232 | */ | |
4f024f37 | 1233 | m = choose_mirror(ms, bio->bi_iter.bi_sector); |
06386bbf | 1234 | if (unlikely(!m)) |
846785e6 | 1235 | return DM_MAPIO_KILL; |
1da177e4 | 1236 | |
89c7cd89 | 1237 | dm_bio_record(&bio_record->details, bio); |
89c7cd89 | 1238 | bio_record->m = m; |
06386bbf JB |
1239 | |
1240 | map_bio(m, bio); | |
1241 | ||
d2a7ad29 | 1242 | return DM_MAPIO_REMAPPED; |
1da177e4 LT |
1243 | } |
1244 | ||
4e4cbee9 CH |
1245 | static int mirror_end_io(struct dm_target *ti, struct bio *bio, |
1246 | blk_status_t *error) | |
1da177e4 | 1247 | { |
70246286 | 1248 | int rw = bio_data_dir(bio); |
26cb62a2 | 1249 | struct mirror_set *ms = ti->private; |
06386bbf JB |
1250 | struct mirror *m = NULL; |
1251 | struct dm_bio_details *bd = NULL; | |
0045d61b MP |
1252 | struct dm_raid1_bio_record *bio_record = |
1253 | dm_per_bio_data(bio, sizeof(struct dm_raid1_bio_record)); | |
1da177e4 LT |
1254 | |
1255 | /* | |
1256 | * We need to dec pending if this was a write. | |
1257 | */ | |
06386bbf | 1258 | if (rw == WRITE) { |
1eff9d32 | 1259 | if (!(bio->bi_opf & REQ_PREFLUSH) && |
28a8f0d3 | 1260 | bio_op(bio) != REQ_OP_DISCARD) |
0045d61b | 1261 | dm_rh_dec(ms->rh, bio_record->write_region); |
1be56909 | 1262 | return DM_ENDIO_DONE; |
06386bbf | 1263 | } |
1da177e4 | 1264 | |
4e4cbee9 | 1265 | if (*error == BLK_STS_NOTSUPP) |
cd15fb64 | 1266 | goto out; |
06386bbf | 1267 | |
9966afaf | 1268 | if (bio->bi_opf & REQ_RAHEAD) |
cd15fb64 | 1269 | goto out; |
06386bbf | 1270 | |
1be56909 | 1271 | if (unlikely(*error)) { |
309dca30 | 1272 | if (!bio_record->details.bi_bdev) { |
cd15fb64 MS |
1273 | /* |
1274 | * There wasn't enough memory to record necessary | |
1275 | * information for a retry or there was no other | |
1276 | * mirror in-sync. | |
1277 | */ | |
1278 | DMERR_LIMIT("Mirror read failed."); | |
c6b1e36c | 1279 | return DM_ENDIO_DONE; |
cd15fb64 MS |
1280 | } |
1281 | ||
89c7cd89 | 1282 | m = bio_record->m; |
e03f1a84 | 1283 | |
06386bbf JB |
1284 | DMERR("Mirror read failed from %s. Trying alternative device.", |
1285 | m->dev->name); | |
1286 | ||
06386bbf JB |
1287 | fail_mirror(m, DM_RAID1_READ_ERROR); |
1288 | ||
1289 | /* | |
1290 | * A failed read is requeued for another attempt using an intact | |
1291 | * mirror. | |
1292 | */ | |
1293 | if (default_ok(m) || mirror_available(ms, bio)) { | |
89c7cd89 | 1294 | bd = &bio_record->details; |
06386bbf JB |
1295 | |
1296 | dm_bio_restore(bd, bio); | |
309dca30 | 1297 | bio_record->details.bi_bdev = NULL; |
4e4cbee9 | 1298 | bio->bi_status = 0; |
f3a44fe0 | 1299 | |
06386bbf | 1300 | queue_bio(ms, bio, rw); |
19cbbc60 | 1301 | return DM_ENDIO_INCOMPLETE; |
06386bbf JB |
1302 | } |
1303 | DMERR("All replicated volumes dead, failing I/O"); | |
1304 | } | |
1305 | ||
cd15fb64 | 1306 | out: |
309dca30 | 1307 | bio_record->details.bi_bdev = NULL; |
cd15fb64 | 1308 | |
1be56909 | 1309 | return DM_ENDIO_DONE; |
1da177e4 LT |
1310 | } |
1311 | ||
b80aa7a0 | 1312 | static void mirror_presuspend(struct dm_target *ti) |
1da177e4 | 1313 | { |
26cb62a2 | 1314 | struct mirror_set *ms = ti->private; |
1f965b19 | 1315 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
1da177e4 | 1316 | |
04788507 MP |
1317 | struct bio_list holds; |
1318 | struct bio *bio; | |
1319 | ||
b80aa7a0 JB |
1320 | atomic_set(&ms->suspend, 1); |
1321 | ||
f0703040 TY |
1322 | /* |
1323 | * Process bios in the hold list to start recovery waiting | |
1324 | * for bios in the hold list. After the process, no bio has | |
1325 | * a chance to be added in the hold list because ms->suspend | |
1326 | * is set. | |
1327 | */ | |
1328 | spin_lock_irq(&ms->lock); | |
1329 | holds = ms->holds; | |
1330 | bio_list_init(&ms->holds); | |
1331 | spin_unlock_irq(&ms->lock); | |
1332 | ||
1333 | while ((bio = bio_list_pop(&holds))) | |
1334 | hold_bio(ms, bio); | |
1335 | ||
b80aa7a0 JB |
1336 | /* |
1337 | * We must finish up all the work that we've | |
1338 | * generated (i.e. recovery work). | |
1339 | */ | |
1f965b19 | 1340 | dm_rh_stop_recovery(ms->rh); |
33184048 | 1341 | |
33184048 | 1342 | wait_event(_kmirrord_recovery_stopped, |
1f965b19 | 1343 | !dm_rh_recovery_in_flight(ms->rh)); |
33184048 | 1344 | |
b80aa7a0 JB |
1345 | if (log->type->presuspend && log->type->presuspend(log)) |
1346 | /* FIXME: need better error handling */ | |
1347 | DMWARN("log presuspend failed"); | |
1348 | ||
1349 | /* | |
1350 | * Now that recovery is complete/stopped and the | |
1351 | * delayed bios are queued, we need to wait for | |
1352 | * the worker thread to complete. This way, | |
1353 | * we know that all of our I/O has been pushed. | |
1354 | */ | |
1355 | flush_workqueue(ms->kmirrord_wq); | |
1356 | } | |
1357 | ||
1358 | static void mirror_postsuspend(struct dm_target *ti) | |
1359 | { | |
1360 | struct mirror_set *ms = ti->private; | |
1f965b19 | 1361 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
b80aa7a0 | 1362 | |
6b3df0d7 | 1363 | if (log->type->postsuspend && log->type->postsuspend(log)) |
1da177e4 | 1364 | /* FIXME: need better error handling */ |
b80aa7a0 | 1365 | DMWARN("log postsuspend failed"); |
1da177e4 LT |
1366 | } |
1367 | ||
1368 | static void mirror_resume(struct dm_target *ti) | |
1369 | { | |
b80aa7a0 | 1370 | struct mirror_set *ms = ti->private; |
1f965b19 | 1371 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
b80aa7a0 JB |
1372 | |
1373 | atomic_set(&ms->suspend, 0); | |
1da177e4 LT |
1374 | if (log->type->resume && log->type->resume(log)) |
1375 | /* FIXME: need better error handling */ | |
1376 | DMWARN("log resume failed"); | |
1f965b19 | 1377 | dm_rh_start_recovery(ms->rh); |
1da177e4 LT |
1378 | } |
1379 | ||
af195ac8 JB |
1380 | /* |
1381 | * device_status_char | |
1382 | * @m: mirror device/leg we want the status of | |
1383 | * | |
1384 | * We return one character representing the most severe error | |
1385 | * we have encountered. | |
1386 | * A => Alive - No failures | |
1387 | * D => Dead - A write failure occurred leaving mirror out-of-sync | |
1388 | * S => Sync - A sychronization failure occurred, mirror out-of-sync | |
1389 | * R => Read - A read failure occurred, mirror data unaffected | |
1390 | * | |
1391 | * Returns: <char> | |
1392 | */ | |
1393 | static char device_status_char(struct mirror *m) | |
1394 | { | |
1395 | if (!atomic_read(&(m->error_count))) | |
1396 | return 'A'; | |
1397 | ||
64b30c46 MP |
1398 | return (test_bit(DM_RAID1_FLUSH_ERROR, &(m->error_type))) ? 'F' : |
1399 | (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' : | |
af195ac8 JB |
1400 | (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' : |
1401 | (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U'; | |
1402 | } | |
1403 | ||
1404 | ||
fd7c092e | 1405 | static void mirror_status(struct dm_target *ti, status_type_t type, |
86a3238c | 1406 | unsigned int status_flags, char *result, unsigned int maxlen) |
1da177e4 | 1407 | { |
315dcc22 | 1408 | unsigned int m, sz = 0; |
ed63287d | 1409 | int num_feature_args = 0; |
26cb62a2 | 1410 | struct mirror_set *ms = ti->private; |
1f965b19 | 1411 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
65972a6f | 1412 | char buffer[MAX_NR_MIRRORS + 1]; |
1da177e4 | 1413 | |
1da177e4 LT |
1414 | switch (type) { |
1415 | case STATUSTYPE_INFO: | |
1416 | DMEMIT("%d ", ms->nr_mirrors); | |
af195ac8 | 1417 | for (m = 0; m < ms->nr_mirrors; m++) { |
1da177e4 | 1418 | DMEMIT("%s ", ms->mirror[m].dev->name); |
af195ac8 JB |
1419 | buffer[m] = device_status_char(&(ms->mirror[m])); |
1420 | } | |
1421 | buffer[m] = '\0'; | |
1da177e4 | 1422 | |
af195ac8 | 1423 | DMEMIT("%llu/%llu 1 %s ", |
1f965b19 | 1424 | (unsigned long long)log->type->get_sync_count(log), |
af195ac8 | 1425 | (unsigned long long)ms->nr_regions, buffer); |
315dcc22 | 1426 | |
1f965b19 | 1427 | sz += log->type->status(log, type, result+sz, maxlen-sz); |
315dcc22 | 1428 | |
1da177e4 LT |
1429 | break; |
1430 | ||
1431 | case STATUSTYPE_TABLE: | |
1f965b19 | 1432 | sz = log->type->status(log, type, result, maxlen); |
315dcc22 | 1433 | |
e52b8f6d | 1434 | DMEMIT("%d", ms->nr_mirrors); |
1da177e4 | 1435 | for (m = 0; m < ms->nr_mirrors; m++) |
e52b8f6d | 1436 | DMEMIT(" %s %llu", ms->mirror[m].dev->name, |
b80aa7a0 | 1437 | (unsigned long long)ms->mirror[m].offset); |
a8e6afa2 | 1438 | |
ed63287d LZ |
1439 | num_feature_args += !!errors_handled(ms); |
1440 | num_feature_args += !!keep_log(ms); | |
1441 | if (num_feature_args) { | |
1442 | DMEMIT(" %d", num_feature_args); | |
1443 | if (errors_handled(ms)) | |
1444 | DMEMIT(" handle_errors"); | |
1445 | if (keep_log(ms)) | |
1446 | DMEMIT(" keep_log"); | |
1447 | } | |
1448 | ||
1449 | break; | |
8ec45662 TS |
1450 | |
1451 | case STATUSTYPE_IMA: | |
1452 | DMEMIT_TARGET_NAME_VERSION(ti->type); | |
1453 | DMEMIT(",nr_mirrors=%d", ms->nr_mirrors); | |
1454 | for (m = 0; m < ms->nr_mirrors; m++) { | |
1455 | DMEMIT(",mirror_device_%d=%s", m, ms->mirror[m].dev->name); | |
1456 | DMEMIT(",mirror_device_%d_status=%c", | |
1457 | m, device_status_char(&(ms->mirror[m]))); | |
1458 | } | |
1459 | ||
1460 | DMEMIT(",handle_errors=%c", errors_handled(ms) ? 'y' : 'n'); | |
1461 | DMEMIT(",keep_log=%c", keep_log(ms) ? 'y' : 'n'); | |
1462 | ||
1463 | DMEMIT(",log_type_status="); | |
1464 | sz += log->type->status(log, type, result+sz, maxlen-sz); | |
1465 | DMEMIT(";"); | |
1466 | break; | |
1da177e4 | 1467 | } |
1da177e4 LT |
1468 | } |
1469 | ||
af4874e0 MS |
1470 | static int mirror_iterate_devices(struct dm_target *ti, |
1471 | iterate_devices_callout_fn fn, void *data) | |
1472 | { | |
1473 | struct mirror_set *ms = ti->private; | |
1474 | int ret = 0; | |
86a3238c | 1475 | unsigned int i; |
af4874e0 MS |
1476 | |
1477 | for (i = 0; !ret && i < ms->nr_mirrors; i++) | |
1478 | ret = fn(ti, ms->mirror[i].dev, | |
5dea271b | 1479 | ms->mirror[i].offset, ti->len, data); |
af4874e0 MS |
1480 | |
1481 | return ret; | |
1482 | } | |
1483 | ||
1da177e4 LT |
1484 | static struct target_type mirror_target = { |
1485 | .name = "mirror", | |
ed63287d | 1486 | .version = {1, 14, 0}, |
1da177e4 LT |
1487 | .module = THIS_MODULE, |
1488 | .ctr = mirror_ctr, | |
1489 | .dtr = mirror_dtr, | |
1490 | .map = mirror_map, | |
1491 | .end_io = mirror_end_io, | |
b80aa7a0 | 1492 | .presuspend = mirror_presuspend, |
1da177e4 LT |
1493 | .postsuspend = mirror_postsuspend, |
1494 | .resume = mirror_resume, | |
1495 | .status = mirror_status, | |
af4874e0 | 1496 | .iterate_devices = mirror_iterate_devices, |
1da177e4 LT |
1497 | }; |
1498 | ||
1499 | static int __init dm_mirror_init(void) | |
1500 | { | |
b362c733 | 1501 | int r; |
a7e8f7fb TH |
1502 | |
1503 | dm_raid1_wq = alloc_workqueue("dm_raid1_wq", 0, 0); | |
990f61e4 YL |
1504 | if (!dm_raid1_wq) { |
1505 | DMERR("Failed to alloc workqueue"); | |
b362c733 | 1506 | return -ENOMEM; |
990f61e4 | 1507 | } |
1da177e4 | 1508 | |
1da177e4 | 1509 | r = dm_register_target(&mirror_target); |
95f8fac8 | 1510 | if (r < 0) { |
a7e8f7fb | 1511 | destroy_workqueue(dm_raid1_wq); |
b362c733 | 1512 | return r; |
95f8fac8 MP |
1513 | } |
1514 | ||
1515 | return 0; | |
1da177e4 LT |
1516 | } |
1517 | ||
1518 | static void __exit dm_mirror_exit(void) | |
1519 | { | |
a7e8f7fb | 1520 | destroy_workqueue(dm_raid1_wq); |
10d3bd09 | 1521 | dm_unregister_target(&mirror_target); |
1da177e4 LT |
1522 | } |
1523 | ||
1524 | /* Module hooks */ | |
1525 | module_init(dm_mirror_init); | |
1526 | module_exit(dm_mirror_exit); | |
1527 | ||
1528 | MODULE_DESCRIPTION(DM_NAME " mirror target"); | |
1529 | MODULE_AUTHOR("Joe Thornber"); | |
1530 | MODULE_LICENSE("GPL"); |