Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Sistina Software Limited. | |
1f965b19 | 3 | * Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
06386bbf | 8 | #include "dm-bio-record.h" |
1da177e4 | 9 | |
1da177e4 LT |
10 | #include <linux/init.h> |
11 | #include <linux/mempool.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/slab.h> | |
1da177e4 | 15 | #include <linux/workqueue.h> |
1f965b19 | 16 | #include <linux/device-mapper.h> |
a765e20e AK |
17 | #include <linux/dm-io.h> |
18 | #include <linux/dm-dirty-log.h> | |
19 | #include <linux/dm-kcopyd.h> | |
1f965b19 | 20 | #include <linux/dm-region-hash.h> |
1da177e4 | 21 | |
72d94861 | 22 | #define DM_MSG_PREFIX "raid1" |
1f965b19 HM |
23 | |
24 | #define MAX_RECOVERY 1 /* Maximum number of regions recovered in parallel. */ | |
72d94861 | 25 | |
65972a6f KC |
26 | #define MAX_NR_MIRRORS (DM_KCOPYD_MAX_REGIONS + 1) |
27 | ||
ed63287d LZ |
28 | #define DM_RAID1_HANDLE_ERRORS 0x01 |
29 | #define DM_RAID1_KEEP_LOG 0x02 | |
f44db678 | 30 | #define errors_handled(p) ((p)->features & DM_RAID1_HANDLE_ERRORS) |
ed63287d | 31 | #define keep_log(p) ((p)->features & DM_RAID1_KEEP_LOG) |
a8e6afa2 | 32 | |
33184048 | 33 | static DECLARE_WAIT_QUEUE_HEAD(_kmirrord_recovery_stopped); |
1da177e4 | 34 | |
e4c8b3ba NB |
35 | /*----------------------------------------------------------------- |
36 | * Mirror set structures. | |
37 | *---------------------------------------------------------------*/ | |
72f4b314 JB |
38 | enum dm_raid1_error { |
39 | DM_RAID1_WRITE_ERROR, | |
64b30c46 | 40 | DM_RAID1_FLUSH_ERROR, |
72f4b314 JB |
41 | DM_RAID1_SYNC_ERROR, |
42 | DM_RAID1_READ_ERROR | |
43 | }; | |
44 | ||
e4c8b3ba | 45 | struct mirror { |
aa5617c5 | 46 | struct mirror_set *ms; |
e4c8b3ba | 47 | atomic_t error_count; |
39ed7adb | 48 | unsigned long error_type; |
e4c8b3ba NB |
49 | struct dm_dev *dev; |
50 | sector_t offset; | |
51 | }; | |
52 | ||
53 | struct mirror_set { | |
54 | struct dm_target *ti; | |
55 | struct list_head list; | |
1f965b19 | 56 | |
a8e6afa2 | 57 | uint64_t features; |
e4c8b3ba | 58 | |
72f4b314 | 59 | spinlock_t lock; /* protects the lists */ |
e4c8b3ba NB |
60 | struct bio_list reads; |
61 | struct bio_list writes; | |
72f4b314 | 62 | struct bio_list failures; |
04788507 | 63 | struct bio_list holds; /* bios are waiting until suspend */ |
e4c8b3ba | 64 | |
1f965b19 HM |
65 | struct dm_region_hash *rh; |
66 | struct dm_kcopyd_client *kcopyd_client; | |
88be163a MB |
67 | struct dm_io_client *io_client; |
68 | ||
e4c8b3ba NB |
69 | /* recovery */ |
70 | region_t nr_regions; | |
71 | int in_sync; | |
fc1ff958 | 72 | int log_failure; |
929be8fc | 73 | int leg_failure; |
b80aa7a0 | 74 | atomic_t suspend; |
e4c8b3ba | 75 | |
72f4b314 | 76 | atomic_t default_mirror; /* Default mirror */ |
e4c8b3ba | 77 | |
6ad36fe2 HS |
78 | struct workqueue_struct *kmirrord_wq; |
79 | struct work_struct kmirrord_work; | |
a2aebe03 MP |
80 | struct timer_list timer; |
81 | unsigned long timer_pending; | |
82 | ||
72f4b314 | 83 | struct work_struct trigger_event; |
6ad36fe2 | 84 | |
1f965b19 | 85 | unsigned nr_mirrors; |
b18ae8dd | 86 | struct mirror mirror[]; |
e4c8b3ba NB |
87 | }; |
88 | ||
df5d2e90 MP |
89 | DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(raid1_resync_throttle, |
90 | "A percentage of time allocated for raid resynchronization"); | |
91 | ||
1f965b19 | 92 | static void wakeup_mirrord(void *context) |
1da177e4 | 93 | { |
1f965b19 | 94 | struct mirror_set *ms = context; |
1da177e4 | 95 | |
6ad36fe2 HS |
96 | queue_work(ms->kmirrord_wq, &ms->kmirrord_work); |
97 | } | |
98 | ||
8376d3c1 | 99 | static void delayed_wake_fn(struct timer_list *t) |
a2aebe03 | 100 | { |
8376d3c1 | 101 | struct mirror_set *ms = from_timer(ms, t, timer); |
a2aebe03 MP |
102 | |
103 | clear_bit(0, &ms->timer_pending); | |
1f965b19 | 104 | wakeup_mirrord(ms); |
a2aebe03 MP |
105 | } |
106 | ||
107 | static void delayed_wake(struct mirror_set *ms) | |
108 | { | |
109 | if (test_and_set_bit(0, &ms->timer_pending)) | |
110 | return; | |
111 | ||
112 | ms->timer.expires = jiffies + HZ / 5; | |
a2aebe03 MP |
113 | add_timer(&ms->timer); |
114 | } | |
115 | ||
1f965b19 | 116 | static void wakeup_all_recovery_waiters(void *context) |
1da177e4 | 117 | { |
1f965b19 | 118 | wake_up_all(&_kmirrord_recovery_stopped); |
1da177e4 LT |
119 | } |
120 | ||
1f965b19 | 121 | static void queue_bio(struct mirror_set *ms, struct bio *bio, int rw) |
1da177e4 LT |
122 | { |
123 | unsigned long flags; | |
1da177e4 | 124 | int should_wake = 0; |
1f965b19 | 125 | struct bio_list *bl; |
1da177e4 | 126 | |
1f965b19 HM |
127 | bl = (rw == WRITE) ? &ms->writes : &ms->reads; |
128 | spin_lock_irqsave(&ms->lock, flags); | |
129 | should_wake = !(bl->head); | |
130 | bio_list_add(bl, bio); | |
131 | spin_unlock_irqrestore(&ms->lock, flags); | |
1da177e4 LT |
132 | |
133 | if (should_wake) | |
1f965b19 | 134 | wakeup_mirrord(ms); |
1da177e4 LT |
135 | } |
136 | ||
1f965b19 | 137 | static void dispatch_bios(void *context, struct bio_list *bio_list) |
1da177e4 | 138 | { |
1f965b19 HM |
139 | struct mirror_set *ms = context; |
140 | struct bio *bio; | |
1da177e4 | 141 | |
1f965b19 HM |
142 | while ((bio = bio_list_pop(bio_list))) |
143 | queue_bio(ms, bio, WRITE); | |
1da177e4 LT |
144 | } |
145 | ||
89c7cd89 | 146 | struct dm_raid1_bio_record { |
06386bbf | 147 | struct mirror *m; |
309dca30 | 148 | /* if details->bi_bdev == NULL, details were not saved */ |
06386bbf | 149 | struct dm_bio_details details; |
0045d61b | 150 | region_t write_region; |
06386bbf JB |
151 | }; |
152 | ||
1da177e4 LT |
153 | /* |
154 | * Every mirror should look like this one. | |
155 | */ | |
156 | #define DEFAULT_MIRROR 0 | |
157 | ||
158 | /* | |
06386bbf JB |
159 | * This is yucky. We squirrel the mirror struct away inside |
160 | * bi_next for read/write buffers. This is safe since the bh | |
1da177e4 LT |
161 | * doesn't get submitted to the lower levels of block layer. |
162 | */ | |
06386bbf | 163 | static struct mirror *bio_get_m(struct bio *bio) |
1da177e4 | 164 | { |
06386bbf | 165 | return (struct mirror *) bio->bi_next; |
1da177e4 LT |
166 | } |
167 | ||
06386bbf | 168 | static void bio_set_m(struct bio *bio, struct mirror *m) |
1da177e4 | 169 | { |
06386bbf | 170 | bio->bi_next = (struct bio *) m; |
1da177e4 LT |
171 | } |
172 | ||
72f4b314 JB |
173 | static struct mirror *get_default_mirror(struct mirror_set *ms) |
174 | { | |
175 | return &ms->mirror[atomic_read(&ms->default_mirror)]; | |
176 | } | |
177 | ||
178 | static void set_default_mirror(struct mirror *m) | |
179 | { | |
180 | struct mirror_set *ms = m->ms; | |
181 | struct mirror *m0 = &(ms->mirror[0]); | |
182 | ||
183 | atomic_set(&ms->default_mirror, m - m0); | |
184 | } | |
185 | ||
87968ddd MP |
186 | static struct mirror *get_valid_mirror(struct mirror_set *ms) |
187 | { | |
188 | struct mirror *m; | |
189 | ||
190 | for (m = ms->mirror; m < ms->mirror + ms->nr_mirrors; m++) | |
191 | if (!atomic_read(&m->error_count)) | |
192 | return m; | |
193 | ||
194 | return NULL; | |
195 | } | |
196 | ||
72f4b314 JB |
197 | /* fail_mirror |
198 | * @m: mirror device to fail | |
199 | * @error_type: one of the enum's, DM_RAID1_*_ERROR | |
200 | * | |
201 | * If errors are being handled, record the type of | |
202 | * error encountered for this device. If this type | |
203 | * of error has already been recorded, we can return; | |
204 | * otherwise, we must signal userspace by triggering | |
205 | * an event. Additionally, if the device is the | |
206 | * primary device, we must choose a new primary, but | |
207 | * only if the mirror is in-sync. | |
208 | * | |
209 | * This function must not block. | |
210 | */ | |
211 | static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type) | |
212 | { | |
213 | struct mirror_set *ms = m->ms; | |
214 | struct mirror *new; | |
215 | ||
929be8fc MP |
216 | ms->leg_failure = 1; |
217 | ||
72f4b314 JB |
218 | /* |
219 | * error_count is used for nothing more than a | |
220 | * simple way to tell if a device has encountered | |
221 | * errors. | |
222 | */ | |
223 | atomic_inc(&m->error_count); | |
224 | ||
225 | if (test_and_set_bit(error_type, &m->error_type)) | |
226 | return; | |
227 | ||
d460c65a JB |
228 | if (!errors_handled(ms)) |
229 | return; | |
230 | ||
72f4b314 JB |
231 | if (m != get_default_mirror(ms)) |
232 | goto out; | |
233 | ||
ed63287d | 234 | if (!ms->in_sync && !keep_log(ms)) { |
72f4b314 JB |
235 | /* |
236 | * Better to issue requests to same failing device | |
237 | * than to risk returning corrupt data. | |
238 | */ | |
239 | DMERR("Primary mirror (%s) failed while out-of-sync: " | |
240 | "Reads may fail.", m->dev->name); | |
241 | goto out; | |
242 | } | |
243 | ||
87968ddd MP |
244 | new = get_valid_mirror(ms); |
245 | if (new) | |
246 | set_default_mirror(new); | |
247 | else | |
72f4b314 JB |
248 | DMWARN("All sides of mirror have failed."); |
249 | ||
250 | out: | |
251 | schedule_work(&ms->trigger_event); | |
252 | } | |
253 | ||
c0da3748 MP |
254 | static int mirror_flush(struct dm_target *ti) |
255 | { | |
256 | struct mirror_set *ms = ti->private; | |
257 | unsigned long error_bits; | |
258 | ||
259 | unsigned int i; | |
65972a6f | 260 | struct dm_io_region io[MAX_NR_MIRRORS]; |
c0da3748 MP |
261 | struct mirror *m; |
262 | struct dm_io_request io_req = { | |
581075e4 | 263 | .bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC, |
c0da3748 | 264 | .mem.type = DM_IO_KMEM, |
5fc2ffea | 265 | .mem.ptr.addr = NULL, |
c0da3748 MP |
266 | .client = ms->io_client, |
267 | }; | |
268 | ||
269 | for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) { | |
270 | io[i].bdev = m->dev->bdev; | |
271 | io[i].sector = 0; | |
272 | io[i].count = 0; | |
273 | } | |
274 | ||
275 | error_bits = -1; | |
276 | dm_io(&io_req, ms->nr_mirrors, io, &error_bits); | |
277 | if (unlikely(error_bits != 0)) { | |
278 | for (i = 0; i < ms->nr_mirrors; i++) | |
279 | if (test_bit(i, &error_bits)) | |
280 | fail_mirror(ms->mirror + i, | |
64b30c46 | 281 | DM_RAID1_FLUSH_ERROR); |
c0da3748 MP |
282 | return -EIO; |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | /*----------------------------------------------------------------- |
289 | * Recovery. | |
290 | * | |
291 | * When a mirror is first activated we may find that some regions | |
292 | * are in the no-sync state. We have to recover these by | |
293 | * recopying from the default mirror to all the others. | |
294 | *---------------------------------------------------------------*/ | |
4cdc1d1f | 295 | static void recovery_complete(int read_err, unsigned long write_err, |
1da177e4 LT |
296 | void *context) |
297 | { | |
1f965b19 HM |
298 | struct dm_region *reg = context; |
299 | struct mirror_set *ms = dm_rh_region_context(reg); | |
8f0205b7 | 300 | int m, bit = 0; |
1da177e4 | 301 | |
8f0205b7 | 302 | if (read_err) { |
f44db678 JB |
303 | /* Read error means the failure of default mirror. */ |
304 | DMERR_LIMIT("Unable to read primary mirror during recovery"); | |
8f0205b7 JB |
305 | fail_mirror(get_default_mirror(ms), DM_RAID1_SYNC_ERROR); |
306 | } | |
f44db678 | 307 | |
8f0205b7 | 308 | if (write_err) { |
4cdc1d1f | 309 | DMERR_LIMIT("Write error during recovery (error = 0x%lx)", |
f44db678 | 310 | write_err); |
8f0205b7 JB |
311 | /* |
312 | * Bits correspond to devices (excluding default mirror). | |
313 | * The default mirror cannot change during recovery. | |
314 | */ | |
315 | for (m = 0; m < ms->nr_mirrors; m++) { | |
316 | if (&ms->mirror[m] == get_default_mirror(ms)) | |
317 | continue; | |
318 | if (test_bit(bit, &write_err)) | |
319 | fail_mirror(ms->mirror + m, | |
320 | DM_RAID1_SYNC_ERROR); | |
321 | bit++; | |
322 | } | |
323 | } | |
f44db678 | 324 | |
1f965b19 | 325 | dm_rh_recovery_end(reg, !(read_err || write_err)); |
1da177e4 LT |
326 | } |
327 | ||
7209049d | 328 | static void recover(struct mirror_set *ms, struct dm_region *reg) |
1da177e4 | 329 | { |
1f965b19 | 330 | unsigned i; |
eb69aca5 | 331 | struct dm_io_region from, to[DM_KCOPYD_MAX_REGIONS], *dest; |
1da177e4 LT |
332 | struct mirror *m; |
333 | unsigned long flags = 0; | |
1f965b19 HM |
334 | region_t key = dm_rh_get_region_key(reg); |
335 | sector_t region_size = dm_rh_get_region_size(ms->rh); | |
1da177e4 LT |
336 | |
337 | /* fill in the source */ | |
72f4b314 | 338 | m = get_default_mirror(ms); |
1da177e4 | 339 | from.bdev = m->dev->bdev; |
1f965b19 HM |
340 | from.sector = m->offset + dm_rh_region_to_sector(ms->rh, key); |
341 | if (key == (ms->nr_regions - 1)) { | |
1da177e4 LT |
342 | /* |
343 | * The final region may be smaller than | |
344 | * region_size. | |
345 | */ | |
1f965b19 | 346 | from.count = ms->ti->len & (region_size - 1); |
1da177e4 | 347 | if (!from.count) |
1f965b19 | 348 | from.count = region_size; |
1da177e4 | 349 | } else |
1f965b19 | 350 | from.count = region_size; |
1da177e4 LT |
351 | |
352 | /* fill in the destinations */ | |
353 | for (i = 0, dest = to; i < ms->nr_mirrors; i++) { | |
72f4b314 | 354 | if (&ms->mirror[i] == get_default_mirror(ms)) |
1da177e4 LT |
355 | continue; |
356 | ||
357 | m = ms->mirror + i; | |
358 | dest->bdev = m->dev->bdev; | |
1f965b19 | 359 | dest->sector = m->offset + dm_rh_region_to_sector(ms->rh, key); |
1da177e4 LT |
360 | dest->count = from.count; |
361 | dest++; | |
362 | } | |
363 | ||
364 | /* hand to kcopyd */ | |
f7c83e2e | 365 | if (!errors_handled(ms)) |
db2351eb | 366 | flags |= BIT(DM_KCOPYD_IGNORE_ERROR); |
f7c83e2e | 367 | |
7209049d MS |
368 | dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, |
369 | flags, recovery_complete, reg); | |
1da177e4 LT |
370 | } |
371 | ||
ed63287d LZ |
372 | static void reset_ms_flags(struct mirror_set *ms) |
373 | { | |
374 | unsigned int m; | |
375 | ||
376 | ms->leg_failure = 0; | |
377 | for (m = 0; m < ms->nr_mirrors; m++) { | |
378 | atomic_set(&(ms->mirror[m].error_count), 0); | |
379 | ms->mirror[m].error_type = 0; | |
380 | } | |
381 | } | |
382 | ||
1da177e4 LT |
383 | static void do_recovery(struct mirror_set *ms) |
384 | { | |
1f965b19 HM |
385 | struct dm_region *reg; |
386 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); | |
1da177e4 LT |
387 | |
388 | /* | |
389 | * Start quiescing some regions. | |
390 | */ | |
1f965b19 | 391 | dm_rh_recovery_prepare(ms->rh); |
1da177e4 LT |
392 | |
393 | /* | |
394 | * Copy any already quiesced regions. | |
395 | */ | |
7209049d MS |
396 | while ((reg = dm_rh_recovery_start(ms->rh))) |
397 | recover(ms, reg); | |
1da177e4 LT |
398 | |
399 | /* | |
400 | * Update the in sync flag. | |
401 | */ | |
402 | if (!ms->in_sync && | |
403 | (log->type->get_sync_count(log) == ms->nr_regions)) { | |
404 | /* the sync is complete */ | |
405 | dm_table_event(ms->ti->table); | |
406 | ms->in_sync = 1; | |
ed63287d | 407 | reset_ms_flags(ms); |
1da177e4 LT |
408 | } |
409 | } | |
410 | ||
411 | /*----------------------------------------------------------------- | |
412 | * Reads | |
413 | *---------------------------------------------------------------*/ | |
414 | static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) | |
415 | { | |
06386bbf JB |
416 | struct mirror *m = get_default_mirror(ms); |
417 | ||
418 | do { | |
419 | if (likely(!atomic_read(&m->error_count))) | |
420 | return m; | |
421 | ||
422 | if (m-- == ms->mirror) | |
423 | m += ms->nr_mirrors; | |
424 | } while (m != get_default_mirror(ms)); | |
425 | ||
426 | return NULL; | |
427 | } | |
428 | ||
429 | static int default_ok(struct mirror *m) | |
430 | { | |
431 | struct mirror *default_mirror = get_default_mirror(m->ms); | |
432 | ||
433 | return !atomic_read(&default_mirror->error_count); | |
434 | } | |
435 | ||
436 | static int mirror_available(struct mirror_set *ms, struct bio *bio) | |
437 | { | |
1f965b19 HM |
438 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
439 | region_t region = dm_rh_bio_to_region(ms->rh, bio); | |
06386bbf | 440 | |
1f965b19 | 441 | if (log->type->in_sync(log, region, 0)) |
4f024f37 | 442 | return choose_mirror(ms, bio->bi_iter.bi_sector) ? 1 : 0; |
06386bbf JB |
443 | |
444 | return 0; | |
1da177e4 LT |
445 | } |
446 | ||
447 | /* | |
448 | * remap a buffer to a particular mirror. | |
449 | */ | |
06386bbf JB |
450 | static sector_t map_sector(struct mirror *m, struct bio *bio) |
451 | { | |
4f024f37 | 452 | if (unlikely(!bio->bi_iter.bi_size)) |
4184153f | 453 | return 0; |
4f024f37 | 454 | return m->offset + dm_target_offset(m->ms->ti, bio->bi_iter.bi_sector); |
06386bbf JB |
455 | } |
456 | ||
457 | static void map_bio(struct mirror *m, struct bio *bio) | |
1da177e4 | 458 | { |
74d46992 | 459 | bio_set_dev(bio, m->dev->bdev); |
4f024f37 | 460 | bio->bi_iter.bi_sector = map_sector(m, bio); |
06386bbf JB |
461 | } |
462 | ||
22a1ceb1 | 463 | static void map_region(struct dm_io_region *io, struct mirror *m, |
06386bbf JB |
464 | struct bio *bio) |
465 | { | |
466 | io->bdev = m->dev->bdev; | |
467 | io->sector = map_sector(m, bio); | |
aa8b57aa | 468 | io->count = bio_sectors(bio); |
06386bbf JB |
469 | } |
470 | ||
04788507 MP |
471 | static void hold_bio(struct mirror_set *ms, struct bio *bio) |
472 | { | |
473 | /* | |
f0703040 TY |
474 | * Lock is required to avoid race condition during suspend |
475 | * process. | |
04788507 | 476 | */ |
f0703040 TY |
477 | spin_lock_irq(&ms->lock); |
478 | ||
04788507 | 479 | if (atomic_read(&ms->suspend)) { |
f0703040 TY |
480 | spin_unlock_irq(&ms->lock); |
481 | ||
482 | /* | |
483 | * If device is suspended, complete the bio. | |
484 | */ | |
04788507 | 485 | if (dm_noflush_suspending(ms->ti)) |
4e4cbee9 | 486 | bio->bi_status = BLK_STS_DM_REQUEUE; |
04788507 | 487 | else |
4e4cbee9 | 488 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
489 | |
490 | bio_endio(bio); | |
04788507 MP |
491 | return; |
492 | } | |
493 | ||
494 | /* | |
495 | * Hold bio until the suspend is complete. | |
496 | */ | |
04788507 MP |
497 | bio_list_add(&ms->holds, bio); |
498 | spin_unlock_irq(&ms->lock); | |
499 | } | |
500 | ||
06386bbf JB |
501 | /*----------------------------------------------------------------- |
502 | * Reads | |
503 | *---------------------------------------------------------------*/ | |
504 | static void read_callback(unsigned long error, void *context) | |
505 | { | |
506 | struct bio *bio = context; | |
507 | struct mirror *m; | |
508 | ||
509 | m = bio_get_m(bio); | |
510 | bio_set_m(bio, NULL); | |
511 | ||
512 | if (likely(!error)) { | |
4246a0b6 | 513 | bio_endio(bio); |
06386bbf JB |
514 | return; |
515 | } | |
516 | ||
517 | fail_mirror(m, DM_RAID1_READ_ERROR); | |
518 | ||
519 | if (likely(default_ok(m)) || mirror_available(m->ms, bio)) { | |
520 | DMWARN_LIMIT("Read failure on mirror device %s. " | |
521 | "Trying alternative device.", | |
522 | m->dev->name); | |
70246286 | 523 | queue_bio(m->ms, bio, bio_data_dir(bio)); |
06386bbf JB |
524 | return; |
525 | } | |
526 | ||
527 | DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.", | |
528 | m->dev->name); | |
4246a0b6 | 529 | bio_io_error(bio); |
06386bbf JB |
530 | } |
531 | ||
532 | /* Asynchronous read. */ | |
533 | static void read_async_bio(struct mirror *m, struct bio *bio) | |
534 | { | |
22a1ceb1 | 535 | struct dm_io_region io; |
06386bbf | 536 | struct dm_io_request io_req = { |
581075e4 | 537 | .bi_opf = REQ_OP_READ, |
003b5c57 KO |
538 | .mem.type = DM_IO_BIO, |
539 | .mem.ptr.bio = bio, | |
06386bbf JB |
540 | .notify.fn = read_callback, |
541 | .notify.context = bio, | |
542 | .client = m->ms->io_client, | |
543 | }; | |
544 | ||
545 | map_region(&io, m, bio); | |
546 | bio_set_m(bio, m); | |
1f965b19 HM |
547 | BUG_ON(dm_io(&io_req, 1, &io, NULL)); |
548 | } | |
549 | ||
550 | static inline int region_in_sync(struct mirror_set *ms, region_t region, | |
551 | int may_block) | |
552 | { | |
553 | int state = dm_rh_get_state(ms->rh, region, may_block); | |
554 | return state == DM_RH_CLEAN || state == DM_RH_DIRTY; | |
1da177e4 LT |
555 | } |
556 | ||
557 | static void do_reads(struct mirror_set *ms, struct bio_list *reads) | |
558 | { | |
559 | region_t region; | |
560 | struct bio *bio; | |
561 | struct mirror *m; | |
562 | ||
563 | while ((bio = bio_list_pop(reads))) { | |
1f965b19 | 564 | region = dm_rh_bio_to_region(ms->rh, bio); |
06386bbf | 565 | m = get_default_mirror(ms); |
1da177e4 LT |
566 | |
567 | /* | |
568 | * We can only read balance if the region is in sync. | |
569 | */ | |
1f965b19 | 570 | if (likely(region_in_sync(ms, region, 1))) |
4f024f37 | 571 | m = choose_mirror(ms, bio->bi_iter.bi_sector); |
06386bbf JB |
572 | else if (m && atomic_read(&m->error_count)) |
573 | m = NULL; | |
1da177e4 | 574 | |
06386bbf JB |
575 | if (likely(m)) |
576 | read_async_bio(m, bio); | |
577 | else | |
4246a0b6 | 578 | bio_io_error(bio); |
1da177e4 LT |
579 | } |
580 | } | |
581 | ||
582 | /*----------------------------------------------------------------- | |
583 | * Writes. | |
584 | * | |
585 | * We do different things with the write io depending on the | |
586 | * state of the region that it's in: | |
587 | * | |
588 | * SYNC: increment pending, use kcopyd to write to *all* mirrors | |
589 | * RECOVERING: delay the io until recovery completes | |
590 | * NOSYNC: increment pending, just write to the default mirror | |
591 | *---------------------------------------------------------------*/ | |
72f4b314 | 592 | |
72f4b314 | 593 | |
1da177e4 LT |
594 | static void write_callback(unsigned long error, void *context) |
595 | { | |
4246a0b6 | 596 | unsigned i; |
1da177e4 LT |
597 | struct bio *bio = (struct bio *) context; |
598 | struct mirror_set *ms; | |
72f4b314 JB |
599 | int should_wake = 0; |
600 | unsigned long flags; | |
1da177e4 | 601 | |
06386bbf JB |
602 | ms = bio_get_m(bio)->ms; |
603 | bio_set_m(bio, NULL); | |
1da177e4 LT |
604 | |
605 | /* | |
606 | * NOTE: We don't decrement the pending count here, | |
607 | * instead it is done by the targets endio function. | |
608 | * This way we handle both writes to SYNC and NOSYNC | |
609 | * regions with the same code. | |
610 | */ | |
60f355ea | 611 | if (likely(!error)) { |
4246a0b6 | 612 | bio_endio(bio); |
60f355ea MP |
613 | return; |
614 | } | |
1da177e4 | 615 | |
f2ed51ac MP |
616 | /* |
617 | * If the bio is discard, return an error, but do not | |
618 | * degrade the array. | |
619 | */ | |
e6047149 | 620 | if (bio_op(bio) == REQ_OP_DISCARD) { |
4e4cbee9 | 621 | bio->bi_status = BLK_STS_NOTSUPP; |
4246a0b6 | 622 | bio_endio(bio); |
f2ed51ac MP |
623 | return; |
624 | } | |
625 | ||
72f4b314 JB |
626 | for (i = 0; i < ms->nr_mirrors; i++) |
627 | if (test_bit(i, &error)) | |
628 | fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR); | |
72f4b314 | 629 | |
60f355ea MP |
630 | /* |
631 | * Need to raise event. Since raising | |
632 | * events can block, we need to do it in | |
633 | * the main thread. | |
634 | */ | |
635 | spin_lock_irqsave(&ms->lock, flags); | |
636 | if (!ms->failures.head) | |
637 | should_wake = 1; | |
638 | bio_list_add(&ms->failures, bio); | |
639 | spin_unlock_irqrestore(&ms->lock, flags); | |
640 | if (should_wake) | |
641 | wakeup_mirrord(ms); | |
1da177e4 LT |
642 | } |
643 | ||
644 | static void do_write(struct mirror_set *ms, struct bio *bio) | |
645 | { | |
646 | unsigned int i; | |
65972a6f | 647 | struct dm_io_region io[MAX_NR_MIRRORS], *dest = io; |
1da177e4 | 648 | struct mirror *m; |
581075e4 | 649 | blk_opf_t op_flags = bio->bi_opf & (REQ_FUA | REQ_PREFLUSH); |
88be163a | 650 | struct dm_io_request io_req = { |
581075e4 | 651 | .bi_opf = REQ_OP_WRITE | op_flags, |
003b5c57 KO |
652 | .mem.type = DM_IO_BIO, |
653 | .mem.ptr.bio = bio, | |
88be163a MB |
654 | .notify.fn = write_callback, |
655 | .notify.context = bio, | |
656 | .client = ms->io_client, | |
657 | }; | |
1da177e4 | 658 | |
e6047149 | 659 | if (bio_op(bio) == REQ_OP_DISCARD) { |
581075e4 | 660 | io_req.bi_opf = REQ_OP_DISCARD | op_flags; |
5fc2ffea MS |
661 | io_req.mem.type = DM_IO_KMEM; |
662 | io_req.mem.ptr.addr = NULL; | |
663 | } | |
664 | ||
06386bbf JB |
665 | for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) |
666 | map_region(dest++, m, bio); | |
1da177e4 | 667 | |
06386bbf JB |
668 | /* |
669 | * Use default mirror because we only need it to retrieve the reference | |
670 | * to the mirror set in write_callback(). | |
671 | */ | |
672 | bio_set_m(bio, get_default_mirror(ms)); | |
88be163a | 673 | |
1f965b19 | 674 | BUG_ON(dm_io(&io_req, ms->nr_mirrors, io, NULL)); |
1da177e4 LT |
675 | } |
676 | ||
677 | static void do_writes(struct mirror_set *ms, struct bio_list *writes) | |
678 | { | |
679 | int state; | |
680 | struct bio *bio; | |
681 | struct bio_list sync, nosync, recover, *this_list = NULL; | |
7513c2a7 JB |
682 | struct bio_list requeue; |
683 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); | |
684 | region_t region; | |
1da177e4 LT |
685 | |
686 | if (!writes->head) | |
687 | return; | |
688 | ||
689 | /* | |
690 | * Classify each write. | |
691 | */ | |
692 | bio_list_init(&sync); | |
693 | bio_list_init(&nosync); | |
694 | bio_list_init(&recover); | |
7513c2a7 | 695 | bio_list_init(&requeue); |
1da177e4 LT |
696 | |
697 | while ((bio = bio_list_pop(writes))) { | |
1eff9d32 | 698 | if ((bio->bi_opf & REQ_PREFLUSH) || |
e6047149 | 699 | (bio_op(bio) == REQ_OP_DISCARD)) { |
4184153f MP |
700 | bio_list_add(&sync, bio); |
701 | continue; | |
702 | } | |
703 | ||
7513c2a7 JB |
704 | region = dm_rh_bio_to_region(ms->rh, bio); |
705 | ||
706 | if (log->type->is_remote_recovering && | |
707 | log->type->is_remote_recovering(log, region)) { | |
708 | bio_list_add(&requeue, bio); | |
709 | continue; | |
710 | } | |
711 | ||
712 | state = dm_rh_get_state(ms->rh, region, 1); | |
1da177e4 | 713 | switch (state) { |
1f965b19 HM |
714 | case DM_RH_CLEAN: |
715 | case DM_RH_DIRTY: | |
1da177e4 LT |
716 | this_list = &sync; |
717 | break; | |
718 | ||
1f965b19 | 719 | case DM_RH_NOSYNC: |
1da177e4 LT |
720 | this_list = &nosync; |
721 | break; | |
722 | ||
1f965b19 | 723 | case DM_RH_RECOVERING: |
1da177e4 LT |
724 | this_list = &recover; |
725 | break; | |
726 | } | |
727 | ||
728 | bio_list_add(this_list, bio); | |
729 | } | |
730 | ||
7513c2a7 JB |
731 | /* |
732 | * Add bios that are delayed due to remote recovery | |
733 | * back on to the write queue | |
734 | */ | |
735 | if (unlikely(requeue.head)) { | |
736 | spin_lock_irq(&ms->lock); | |
737 | bio_list_merge(&ms->writes, &requeue); | |
738 | spin_unlock_irq(&ms->lock); | |
69885683 | 739 | delayed_wake(ms); |
7513c2a7 JB |
740 | } |
741 | ||
1da177e4 LT |
742 | /* |
743 | * Increment the pending counts for any regions that will | |
744 | * be written to (writes to recover regions are going to | |
745 | * be delayed). | |
746 | */ | |
1f965b19 HM |
747 | dm_rh_inc_pending(ms->rh, &sync); |
748 | dm_rh_inc_pending(ms->rh, &nosync); | |
d2b69864 JB |
749 | |
750 | /* | |
751 | * If the flush fails on a previous call and succeeds here, | |
752 | * we must not reset the log_failure variable. We need | |
753 | * userspace interaction to do that. | |
754 | */ | |
755 | ms->log_failure = dm_rh_flush(ms->rh) ? 1 : ms->log_failure; | |
1da177e4 LT |
756 | |
757 | /* | |
758 | * Dispatch io. | |
759 | */ | |
5528d17d | 760 | if (unlikely(ms->log_failure) && errors_handled(ms)) { |
b80aa7a0 JB |
761 | spin_lock_irq(&ms->lock); |
762 | bio_list_merge(&ms->failures, &sync); | |
763 | spin_unlock_irq(&ms->lock); | |
1f965b19 | 764 | wakeup_mirrord(ms); |
b80aa7a0 | 765 | } else |
fc1ff958 | 766 | while ((bio = bio_list_pop(&sync))) |
b80aa7a0 | 767 | do_write(ms, bio); |
1da177e4 LT |
768 | |
769 | while ((bio = bio_list_pop(&recover))) | |
1f965b19 | 770 | dm_rh_delay(ms->rh, bio); |
1da177e4 LT |
771 | |
772 | while ((bio = bio_list_pop(&nosync))) { | |
ed63287d | 773 | if (unlikely(ms->leg_failure) && errors_handled(ms) && !keep_log(ms)) { |
ede5ea0b MP |
774 | spin_lock_irq(&ms->lock); |
775 | bio_list_add(&ms->failures, bio); | |
776 | spin_unlock_irq(&ms->lock); | |
777 | wakeup_mirrord(ms); | |
778 | } else { | |
929be8fc | 779 | map_bio(get_default_mirror(ms), bio); |
ed00aabd | 780 | submit_bio_noacct(bio); |
929be8fc | 781 | } |
1da177e4 LT |
782 | } |
783 | } | |
784 | ||
72f4b314 JB |
785 | static void do_failures(struct mirror_set *ms, struct bio_list *failures) |
786 | { | |
787 | struct bio *bio; | |
788 | ||
0f398a84 | 789 | if (likely(!failures->head)) |
72f4b314 JB |
790 | return; |
791 | ||
b80aa7a0 JB |
792 | /* |
793 | * If the log has failed, unattempted writes are being | |
0f398a84 | 794 | * put on the holds list. We can't issue those writes |
b80aa7a0 JB |
795 | * until a log has been marked, so we must store them. |
796 | * | |
797 | * If a 'noflush' suspend is in progress, we can requeue | |
798 | * the I/O's to the core. This give userspace a chance | |
799 | * to reconfigure the mirror, at which point the core | |
800 | * will reissue the writes. If the 'noflush' flag is | |
801 | * not set, we have no choice but to return errors. | |
802 | * | |
803 | * Some writes on the failures list may have been | |
804 | * submitted before the log failure and represent a | |
805 | * failure to write to one of the devices. It is ok | |
806 | * for us to treat them the same and requeue them | |
807 | * as well. | |
808 | */ | |
0f398a84 | 809 | while ((bio = bio_list_pop(failures))) { |
60f355ea | 810 | if (!ms->log_failure) { |
0f398a84 | 811 | ms->in_sync = 0; |
c58098be | 812 | dm_rh_mark_nosync(ms->rh, bio); |
0f398a84 | 813 | } |
60f355ea MP |
814 | |
815 | /* | |
816 | * If all the legs are dead, fail the I/O. | |
ed63287d LZ |
817 | * If the device has failed and keep_log is enabled, |
818 | * fail the I/O. | |
819 | * | |
820 | * If we have been told to handle errors, and keep_log | |
821 | * isn't enabled, hold the bio and wait for userspace to | |
822 | * deal with the problem. | |
823 | * | |
60f355ea MP |
824 | * Otherwise pretend that the I/O succeeded. (This would |
825 | * be wrong if the failed leg returned after reboot and | |
826 | * got replicated back to the good legs.) | |
827 | */ | |
ed63287d | 828 | if (unlikely(!get_valid_mirror(ms) || (keep_log(ms) && ms->log_failure))) |
4246a0b6 | 829 | bio_io_error(bio); |
ed63287d | 830 | else if (errors_handled(ms) && !keep_log(ms)) |
60f355ea MP |
831 | hold_bio(ms, bio); |
832 | else | |
4246a0b6 | 833 | bio_endio(bio); |
b80aa7a0 | 834 | } |
72f4b314 JB |
835 | } |
836 | ||
837 | static void trigger_event(struct work_struct *work) | |
838 | { | |
839 | struct mirror_set *ms = | |
840 | container_of(work, struct mirror_set, trigger_event); | |
841 | ||
842 | dm_table_event(ms->ti->table); | |
843 | } | |
844 | ||
1da177e4 LT |
845 | /*----------------------------------------------------------------- |
846 | * kmirrord | |
847 | *---------------------------------------------------------------*/ | |
a2aebe03 | 848 | static void do_mirror(struct work_struct *work) |
1da177e4 | 849 | { |
1f965b19 HM |
850 | struct mirror_set *ms = container_of(work, struct mirror_set, |
851 | kmirrord_work); | |
72f4b314 JB |
852 | struct bio_list reads, writes, failures; |
853 | unsigned long flags; | |
1da177e4 | 854 | |
72f4b314 | 855 | spin_lock_irqsave(&ms->lock, flags); |
1da177e4 LT |
856 | reads = ms->reads; |
857 | writes = ms->writes; | |
72f4b314 | 858 | failures = ms->failures; |
1da177e4 LT |
859 | bio_list_init(&ms->reads); |
860 | bio_list_init(&ms->writes); | |
72f4b314 JB |
861 | bio_list_init(&ms->failures); |
862 | spin_unlock_irqrestore(&ms->lock, flags); | |
1da177e4 | 863 | |
1f965b19 | 864 | dm_rh_update_states(ms->rh, errors_handled(ms)); |
1da177e4 LT |
865 | do_recovery(ms); |
866 | do_reads(ms, &reads); | |
867 | do_writes(ms, &writes); | |
72f4b314 | 868 | do_failures(ms, &failures); |
1da177e4 LT |
869 | } |
870 | ||
1da177e4 LT |
871 | /*----------------------------------------------------------------- |
872 | * Target functions | |
873 | *---------------------------------------------------------------*/ | |
874 | static struct mirror_set *alloc_context(unsigned int nr_mirrors, | |
875 | uint32_t region_size, | |
876 | struct dm_target *ti, | |
416cd17b | 877 | struct dm_dirty_log *dl) |
1da177e4 | 878 | { |
bcd67654 GS |
879 | struct mirror_set *ms = |
880 | kzalloc(struct_size(ms, mirror, nr_mirrors), GFP_KERNEL); | |
1da177e4 | 881 | |
1da177e4 | 882 | if (!ms) { |
72d94861 | 883 | ti->error = "Cannot allocate mirror context"; |
1da177e4 LT |
884 | return NULL; |
885 | } | |
886 | ||
1da177e4 | 887 | spin_lock_init(&ms->lock); |
5339fc2d MP |
888 | bio_list_init(&ms->reads); |
889 | bio_list_init(&ms->writes); | |
890 | bio_list_init(&ms->failures); | |
891 | bio_list_init(&ms->holds); | |
1da177e4 LT |
892 | |
893 | ms->ti = ti; | |
894 | ms->nr_mirrors = nr_mirrors; | |
895 | ms->nr_regions = dm_sector_div_up(ti->len, region_size); | |
896 | ms->in_sync = 0; | |
b80aa7a0 | 897 | ms->log_failure = 0; |
929be8fc | 898 | ms->leg_failure = 0; |
b80aa7a0 | 899 | atomic_set(&ms->suspend, 0); |
72f4b314 | 900 | atomic_set(&ms->default_mirror, DEFAULT_MIRROR); |
1da177e4 | 901 | |
bda8efec | 902 | ms->io_client = dm_io_client_create(); |
88be163a MB |
903 | if (IS_ERR(ms->io_client)) { |
904 | ti->error = "Error creating dm_io client"; | |
905 | kfree(ms); | |
906 | return NULL; | |
907 | } | |
908 | ||
1f965b19 HM |
909 | ms->rh = dm_region_hash_create(ms, dispatch_bios, wakeup_mirrord, |
910 | wakeup_all_recovery_waiters, | |
911 | ms->ti->begin, MAX_RECOVERY, | |
912 | dl, region_size, ms->nr_regions); | |
913 | if (IS_ERR(ms->rh)) { | |
72d94861 | 914 | ti->error = "Error creating dirty region hash"; |
a72cf737 | 915 | dm_io_client_destroy(ms->io_client); |
1da177e4 LT |
916 | kfree(ms); |
917 | return NULL; | |
918 | } | |
919 | ||
920 | return ms; | |
921 | } | |
922 | ||
923 | static void free_context(struct mirror_set *ms, struct dm_target *ti, | |
924 | unsigned int m) | |
925 | { | |
926 | while (m--) | |
927 | dm_put_device(ti, ms->mirror[m].dev); | |
928 | ||
88be163a | 929 | dm_io_client_destroy(ms->io_client); |
1f965b19 | 930 | dm_region_hash_destroy(ms->rh); |
1da177e4 LT |
931 | kfree(ms); |
932 | } | |
933 | ||
1da177e4 LT |
934 | static int get_mirror(struct mirror_set *ms, struct dm_target *ti, |
935 | unsigned int mirror, char **argv) | |
936 | { | |
4ee218cd | 937 | unsigned long long offset; |
31998ef1 | 938 | char dummy; |
e80d1c80 | 939 | int ret; |
1da177e4 | 940 | |
ef87bfc2 MB |
941 | if (sscanf(argv[1], "%llu%c", &offset, &dummy) != 1 || |
942 | offset != (sector_t)offset) { | |
72d94861 | 943 | ti->error = "Invalid offset"; |
1da177e4 LT |
944 | return -EINVAL; |
945 | } | |
946 | ||
e80d1c80 VG |
947 | ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), |
948 | &ms->mirror[mirror].dev); | |
949 | if (ret) { | |
72d94861 | 950 | ti->error = "Device lookup failure"; |
e80d1c80 | 951 | return ret; |
1da177e4 LT |
952 | } |
953 | ||
aa5617c5 | 954 | ms->mirror[mirror].ms = ms; |
72f4b314 JB |
955 | atomic_set(&(ms->mirror[mirror].error_count), 0); |
956 | ms->mirror[mirror].error_type = 0; | |
1da177e4 LT |
957 | ms->mirror[mirror].offset = offset; |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
1da177e4 LT |
962 | /* |
963 | * Create dirty log: log_type #log_params <log_params> | |
964 | */ | |
416cd17b | 965 | static struct dm_dirty_log *create_dirty_log(struct dm_target *ti, |
1f965b19 HM |
966 | unsigned argc, char **argv, |
967 | unsigned *args_used) | |
1da177e4 | 968 | { |
1f965b19 | 969 | unsigned param_count; |
416cd17b | 970 | struct dm_dirty_log *dl; |
31998ef1 | 971 | char dummy; |
1da177e4 LT |
972 | |
973 | if (argc < 2) { | |
72d94861 | 974 | ti->error = "Insufficient mirror log arguments"; |
1da177e4 LT |
975 | return NULL; |
976 | } | |
977 | ||
31998ef1 | 978 | if (sscanf(argv[1], "%u%c", ¶m_count, &dummy) != 1) { |
72d94861 | 979 | ti->error = "Invalid mirror log argument count"; |
1da177e4 LT |
980 | return NULL; |
981 | } | |
982 | ||
983 | *args_used = 2 + param_count; | |
984 | ||
985 | if (argc < *args_used) { | |
72d94861 | 986 | ti->error = "Insufficient mirror log arguments"; |
1da177e4 LT |
987 | return NULL; |
988 | } | |
989 | ||
c0da3748 MP |
990 | dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count, |
991 | argv + 2); | |
1da177e4 | 992 | if (!dl) { |
72d94861 | 993 | ti->error = "Error creating mirror dirty log"; |
1da177e4 LT |
994 | return NULL; |
995 | } | |
996 | ||
1da177e4 LT |
997 | return dl; |
998 | } | |
999 | ||
a8e6afa2 JB |
1000 | static int parse_features(struct mirror_set *ms, unsigned argc, char **argv, |
1001 | unsigned *args_used) | |
1002 | { | |
1003 | unsigned num_features; | |
1004 | struct dm_target *ti = ms->ti; | |
31998ef1 | 1005 | char dummy; |
ed63287d | 1006 | int i; |
a8e6afa2 JB |
1007 | |
1008 | *args_used = 0; | |
1009 | ||
1010 | if (!argc) | |
1011 | return 0; | |
1012 | ||
31998ef1 | 1013 | if (sscanf(argv[0], "%u%c", &num_features, &dummy) != 1) { |
a8e6afa2 JB |
1014 | ti->error = "Invalid number of features"; |
1015 | return -EINVAL; | |
1016 | } | |
1017 | ||
1018 | argc--; | |
1019 | argv++; | |
1020 | (*args_used)++; | |
1021 | ||
1022 | if (num_features > argc) { | |
1023 | ti->error = "Not enough arguments to support feature count"; | |
1024 | return -EINVAL; | |
1025 | } | |
1026 | ||
ed63287d LZ |
1027 | for (i = 0; i < num_features; i++) { |
1028 | if (!strcmp("handle_errors", argv[0])) | |
1029 | ms->features |= DM_RAID1_HANDLE_ERRORS; | |
1030 | else if (!strcmp("keep_log", argv[0])) | |
1031 | ms->features |= DM_RAID1_KEEP_LOG; | |
1032 | else { | |
1033 | ti->error = "Unrecognised feature requested"; | |
1034 | return -EINVAL; | |
1035 | } | |
1036 | ||
1037 | argc--; | |
1038 | argv++; | |
1039 | (*args_used)++; | |
1040 | } | |
1041 | if (!errors_handled(ms) && keep_log(ms)) { | |
1042 | ti->error = "keep_log feature requires the handle_errors feature"; | |
a8e6afa2 JB |
1043 | return -EINVAL; |
1044 | } | |
1045 | ||
a8e6afa2 JB |
1046 | return 0; |
1047 | } | |
1048 | ||
1da177e4 LT |
1049 | /* |
1050 | * Construct a mirror mapping: | |
1051 | * | |
1052 | * log_type #log_params <log_params> | |
1053 | * #mirrors [mirror_path offset]{2,} | |
a8e6afa2 | 1054 | * [#features <features>] |
1da177e4 LT |
1055 | * |
1056 | * log_type is "core" or "disk" | |
1057 | * #log_params is between 1 and 3 | |
a8e6afa2 | 1058 | * |
ed63287d | 1059 | * If present, supported features are "handle_errors" and "keep_log". |
1da177e4 | 1060 | */ |
1da177e4 LT |
1061 | static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
1062 | { | |
1063 | int r; | |
1064 | unsigned int nr_mirrors, m, args_used; | |
1065 | struct mirror_set *ms; | |
416cd17b | 1066 | struct dm_dirty_log *dl; |
31998ef1 | 1067 | char dummy; |
1da177e4 LT |
1068 | |
1069 | dl = create_dirty_log(ti, argc, argv, &args_used); | |
1070 | if (!dl) | |
1071 | return -EINVAL; | |
1072 | ||
1073 | argv += args_used; | |
1074 | argc -= args_used; | |
1075 | ||
31998ef1 | 1076 | if (!argc || sscanf(argv[0], "%u%c", &nr_mirrors, &dummy) != 1 || |
65972a6f | 1077 | nr_mirrors < 2 || nr_mirrors > MAX_NR_MIRRORS) { |
72d94861 | 1078 | ti->error = "Invalid number of mirrors"; |
416cd17b | 1079 | dm_dirty_log_destroy(dl); |
1da177e4 LT |
1080 | return -EINVAL; |
1081 | } | |
1082 | ||
1083 | argv++, argc--; | |
1084 | ||
a8e6afa2 JB |
1085 | if (argc < nr_mirrors * 2) { |
1086 | ti->error = "Too few mirror arguments"; | |
416cd17b | 1087 | dm_dirty_log_destroy(dl); |
1da177e4 LT |
1088 | return -EINVAL; |
1089 | } | |
1090 | ||
1091 | ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl); | |
1092 | if (!ms) { | |
416cd17b | 1093 | dm_dirty_log_destroy(dl); |
1da177e4 LT |
1094 | return -ENOMEM; |
1095 | } | |
1096 | ||
1097 | /* Get the mirror parameter sets */ | |
1098 | for (m = 0; m < nr_mirrors; m++) { | |
1099 | r = get_mirror(ms, ti, m, argv); | |
1100 | if (r) { | |
1101 | free_context(ms, ti, m); | |
1102 | return r; | |
1103 | } | |
1104 | argv += 2; | |
1105 | argc -= 2; | |
1106 | } | |
1107 | ||
1108 | ti->private = ms; | |
542f9038 MS |
1109 | |
1110 | r = dm_set_target_max_io_len(ti, dm_rh_get_region_size(ms->rh)); | |
1111 | if (r) | |
1112 | goto err_free_context; | |
1113 | ||
55a62eef AK |
1114 | ti->num_flush_bios = 1; |
1115 | ti->num_discard_bios = 1; | |
30187e1d | 1116 | ti->per_io_data_size = sizeof(struct dm_raid1_bio_record); |
1da177e4 | 1117 | |
670368a8 | 1118 | ms->kmirrord_wq = alloc_workqueue("kmirrord", WQ_MEM_RECLAIM, 0); |
6ad36fe2 HS |
1119 | if (!ms->kmirrord_wq) { |
1120 | DMERR("couldn't start kmirrord"); | |
a72cf737 DM |
1121 | r = -ENOMEM; |
1122 | goto err_free_context; | |
6ad36fe2 HS |
1123 | } |
1124 | INIT_WORK(&ms->kmirrord_work, do_mirror); | |
8376d3c1 | 1125 | timer_setup(&ms->timer, delayed_wake_fn, 0); |
a2aebe03 | 1126 | ms->timer_pending = 0; |
72f4b314 | 1127 | INIT_WORK(&ms->trigger_event, trigger_event); |
6ad36fe2 | 1128 | |
a8e6afa2 | 1129 | r = parse_features(ms, argc, argv, &args_used); |
a72cf737 DM |
1130 | if (r) |
1131 | goto err_destroy_wq; | |
a8e6afa2 JB |
1132 | |
1133 | argv += args_used; | |
1134 | argc -= args_used; | |
1135 | ||
f44db678 JB |
1136 | /* |
1137 | * Any read-balancing addition depends on the | |
1138 | * DM_RAID1_HANDLE_ERRORS flag being present. | |
1139 | * This is because the decision to balance depends | |
1140 | * on the sync state of a region. If the above | |
1141 | * flag is not present, we ignore errors; and | |
1142 | * the sync state may be inaccurate. | |
1143 | */ | |
1144 | ||
a8e6afa2 JB |
1145 | if (argc) { |
1146 | ti->error = "Too many mirror arguments"; | |
a72cf737 DM |
1147 | r = -EINVAL; |
1148 | goto err_destroy_wq; | |
a8e6afa2 JB |
1149 | } |
1150 | ||
df5d2e90 | 1151 | ms->kcopyd_client = dm_kcopyd_client_create(&dm_kcopyd_throttle); |
fa34ce73 MP |
1152 | if (IS_ERR(ms->kcopyd_client)) { |
1153 | r = PTR_ERR(ms->kcopyd_client); | |
a72cf737 | 1154 | goto err_destroy_wq; |
fa34ce73 | 1155 | } |
1da177e4 | 1156 | |
1f965b19 | 1157 | wakeup_mirrord(ms); |
1da177e4 | 1158 | return 0; |
a72cf737 DM |
1159 | |
1160 | err_destroy_wq: | |
1161 | destroy_workqueue(ms->kmirrord_wq); | |
1162 | err_free_context: | |
1163 | free_context(ms, ti, ms->nr_mirrors); | |
1164 | return r; | |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | static void mirror_dtr(struct dm_target *ti) | |
1168 | { | |
1169 | struct mirror_set *ms = (struct mirror_set *) ti->private; | |
1170 | ||
a2aebe03 | 1171 | del_timer_sync(&ms->timer); |
6ad36fe2 | 1172 | flush_workqueue(ms->kmirrord_wq); |
43829731 | 1173 | flush_work(&ms->trigger_event); |
eb69aca5 | 1174 | dm_kcopyd_client_destroy(ms->kcopyd_client); |
6ad36fe2 | 1175 | destroy_workqueue(ms->kmirrord_wq); |
1da177e4 LT |
1176 | free_context(ms, ti, ms->nr_mirrors); |
1177 | } | |
1178 | ||
1da177e4 LT |
1179 | /* |
1180 | * Mirror mapping function | |
1181 | */ | |
7de3ee57 | 1182 | static int mirror_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1183 | { |
70246286 | 1184 | int r, rw = bio_data_dir(bio); |
1da177e4 LT |
1185 | struct mirror *m; |
1186 | struct mirror_set *ms = ti->private; | |
1f965b19 | 1187 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
0045d61b MP |
1188 | struct dm_raid1_bio_record *bio_record = |
1189 | dm_per_bio_data(bio, sizeof(struct dm_raid1_bio_record)); | |
1190 | ||
309dca30 | 1191 | bio_record->details.bi_bdev = NULL; |
cd15fb64 | 1192 | |
1da177e4 | 1193 | if (rw == WRITE) { |
06386bbf | 1194 | /* Save region for mirror_end_io() handler */ |
0045d61b | 1195 | bio_record->write_region = dm_rh_bio_to_region(ms->rh, bio); |
1da177e4 | 1196 | queue_bio(ms, bio, rw); |
d2a7ad29 | 1197 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1198 | } |
1199 | ||
1f965b19 | 1200 | r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0); |
1da177e4 | 1201 | if (r < 0 && r != -EWOULDBLOCK) |
846785e6 | 1202 | return DM_MAPIO_KILL; |
1da177e4 | 1203 | |
1da177e4 | 1204 | /* |
06386bbf | 1205 | * If region is not in-sync queue the bio. |
1da177e4 | 1206 | */ |
06386bbf | 1207 | if (!r || (r == -EWOULDBLOCK)) { |
1eff9d32 | 1208 | if (bio->bi_opf & REQ_RAHEAD) |
846785e6 | 1209 | return DM_MAPIO_KILL; |
1da177e4 | 1210 | |
1da177e4 | 1211 | queue_bio(ms, bio, rw); |
d2a7ad29 | 1212 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1213 | } |
1214 | ||
06386bbf JB |
1215 | /* |
1216 | * The region is in-sync and we can perform reads directly. | |
1217 | * Store enough information so we can retry if it fails. | |
1218 | */ | |
4f024f37 | 1219 | m = choose_mirror(ms, bio->bi_iter.bi_sector); |
06386bbf | 1220 | if (unlikely(!m)) |
846785e6 | 1221 | return DM_MAPIO_KILL; |
1da177e4 | 1222 | |
89c7cd89 | 1223 | dm_bio_record(&bio_record->details, bio); |
89c7cd89 | 1224 | bio_record->m = m; |
06386bbf JB |
1225 | |
1226 | map_bio(m, bio); | |
1227 | ||
d2a7ad29 | 1228 | return DM_MAPIO_REMAPPED; |
1da177e4 LT |
1229 | } |
1230 | ||
4e4cbee9 CH |
1231 | static int mirror_end_io(struct dm_target *ti, struct bio *bio, |
1232 | blk_status_t *error) | |
1da177e4 | 1233 | { |
70246286 | 1234 | int rw = bio_data_dir(bio); |
1da177e4 | 1235 | struct mirror_set *ms = (struct mirror_set *) ti->private; |
06386bbf JB |
1236 | struct mirror *m = NULL; |
1237 | struct dm_bio_details *bd = NULL; | |
0045d61b MP |
1238 | struct dm_raid1_bio_record *bio_record = |
1239 | dm_per_bio_data(bio, sizeof(struct dm_raid1_bio_record)); | |
1da177e4 LT |
1240 | |
1241 | /* | |
1242 | * We need to dec pending if this was a write. | |
1243 | */ | |
06386bbf | 1244 | if (rw == WRITE) { |
1eff9d32 | 1245 | if (!(bio->bi_opf & REQ_PREFLUSH) && |
28a8f0d3 | 1246 | bio_op(bio) != REQ_OP_DISCARD) |
0045d61b | 1247 | dm_rh_dec(ms->rh, bio_record->write_region); |
1be56909 | 1248 | return DM_ENDIO_DONE; |
06386bbf | 1249 | } |
1da177e4 | 1250 | |
4e4cbee9 | 1251 | if (*error == BLK_STS_NOTSUPP) |
cd15fb64 | 1252 | goto out; |
06386bbf | 1253 | |
9966afaf | 1254 | if (bio->bi_opf & REQ_RAHEAD) |
cd15fb64 | 1255 | goto out; |
06386bbf | 1256 | |
1be56909 | 1257 | if (unlikely(*error)) { |
309dca30 | 1258 | if (!bio_record->details.bi_bdev) { |
cd15fb64 MS |
1259 | /* |
1260 | * There wasn't enough memory to record necessary | |
1261 | * information for a retry or there was no other | |
1262 | * mirror in-sync. | |
1263 | */ | |
1264 | DMERR_LIMIT("Mirror read failed."); | |
c6b1e36c | 1265 | return DM_ENDIO_DONE; |
cd15fb64 MS |
1266 | } |
1267 | ||
89c7cd89 | 1268 | m = bio_record->m; |
e03f1a84 | 1269 | |
06386bbf JB |
1270 | DMERR("Mirror read failed from %s. Trying alternative device.", |
1271 | m->dev->name); | |
1272 | ||
06386bbf JB |
1273 | fail_mirror(m, DM_RAID1_READ_ERROR); |
1274 | ||
1275 | /* | |
1276 | * A failed read is requeued for another attempt using an intact | |
1277 | * mirror. | |
1278 | */ | |
1279 | if (default_ok(m) || mirror_available(ms, bio)) { | |
89c7cd89 | 1280 | bd = &bio_record->details; |
06386bbf JB |
1281 | |
1282 | dm_bio_restore(bd, bio); | |
309dca30 | 1283 | bio_record->details.bi_bdev = NULL; |
4e4cbee9 | 1284 | bio->bi_status = 0; |
f3a44fe0 | 1285 | |
06386bbf | 1286 | queue_bio(ms, bio, rw); |
19cbbc60 | 1287 | return DM_ENDIO_INCOMPLETE; |
06386bbf JB |
1288 | } |
1289 | DMERR("All replicated volumes dead, failing I/O"); | |
1290 | } | |
1291 | ||
cd15fb64 | 1292 | out: |
309dca30 | 1293 | bio_record->details.bi_bdev = NULL; |
cd15fb64 | 1294 | |
1be56909 | 1295 | return DM_ENDIO_DONE; |
1da177e4 LT |
1296 | } |
1297 | ||
b80aa7a0 | 1298 | static void mirror_presuspend(struct dm_target *ti) |
1da177e4 LT |
1299 | { |
1300 | struct mirror_set *ms = (struct mirror_set *) ti->private; | |
1f965b19 | 1301 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
1da177e4 | 1302 | |
04788507 MP |
1303 | struct bio_list holds; |
1304 | struct bio *bio; | |
1305 | ||
b80aa7a0 JB |
1306 | atomic_set(&ms->suspend, 1); |
1307 | ||
f0703040 TY |
1308 | /* |
1309 | * Process bios in the hold list to start recovery waiting | |
1310 | * for bios in the hold list. After the process, no bio has | |
1311 | * a chance to be added in the hold list because ms->suspend | |
1312 | * is set. | |
1313 | */ | |
1314 | spin_lock_irq(&ms->lock); | |
1315 | holds = ms->holds; | |
1316 | bio_list_init(&ms->holds); | |
1317 | spin_unlock_irq(&ms->lock); | |
1318 | ||
1319 | while ((bio = bio_list_pop(&holds))) | |
1320 | hold_bio(ms, bio); | |
1321 | ||
b80aa7a0 JB |
1322 | /* |
1323 | * We must finish up all the work that we've | |
1324 | * generated (i.e. recovery work). | |
1325 | */ | |
1f965b19 | 1326 | dm_rh_stop_recovery(ms->rh); |
33184048 | 1327 | |
33184048 | 1328 | wait_event(_kmirrord_recovery_stopped, |
1f965b19 | 1329 | !dm_rh_recovery_in_flight(ms->rh)); |
33184048 | 1330 | |
b80aa7a0 JB |
1331 | if (log->type->presuspend && log->type->presuspend(log)) |
1332 | /* FIXME: need better error handling */ | |
1333 | DMWARN("log presuspend failed"); | |
1334 | ||
1335 | /* | |
1336 | * Now that recovery is complete/stopped and the | |
1337 | * delayed bios are queued, we need to wait for | |
1338 | * the worker thread to complete. This way, | |
1339 | * we know that all of our I/O has been pushed. | |
1340 | */ | |
1341 | flush_workqueue(ms->kmirrord_wq); | |
1342 | } | |
1343 | ||
1344 | static void mirror_postsuspend(struct dm_target *ti) | |
1345 | { | |
1346 | struct mirror_set *ms = ti->private; | |
1f965b19 | 1347 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
b80aa7a0 | 1348 | |
6b3df0d7 | 1349 | if (log->type->postsuspend && log->type->postsuspend(log)) |
1da177e4 | 1350 | /* FIXME: need better error handling */ |
b80aa7a0 | 1351 | DMWARN("log postsuspend failed"); |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | static void mirror_resume(struct dm_target *ti) | |
1355 | { | |
b80aa7a0 | 1356 | struct mirror_set *ms = ti->private; |
1f965b19 | 1357 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
b80aa7a0 JB |
1358 | |
1359 | atomic_set(&ms->suspend, 0); | |
1da177e4 LT |
1360 | if (log->type->resume && log->type->resume(log)) |
1361 | /* FIXME: need better error handling */ | |
1362 | DMWARN("log resume failed"); | |
1f965b19 | 1363 | dm_rh_start_recovery(ms->rh); |
1da177e4 LT |
1364 | } |
1365 | ||
af195ac8 JB |
1366 | /* |
1367 | * device_status_char | |
1368 | * @m: mirror device/leg we want the status of | |
1369 | * | |
1370 | * We return one character representing the most severe error | |
1371 | * we have encountered. | |
1372 | * A => Alive - No failures | |
1373 | * D => Dead - A write failure occurred leaving mirror out-of-sync | |
1374 | * S => Sync - A sychronization failure occurred, mirror out-of-sync | |
1375 | * R => Read - A read failure occurred, mirror data unaffected | |
1376 | * | |
1377 | * Returns: <char> | |
1378 | */ | |
1379 | static char device_status_char(struct mirror *m) | |
1380 | { | |
1381 | if (!atomic_read(&(m->error_count))) | |
1382 | return 'A'; | |
1383 | ||
64b30c46 MP |
1384 | return (test_bit(DM_RAID1_FLUSH_ERROR, &(m->error_type))) ? 'F' : |
1385 | (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' : | |
af195ac8 JB |
1386 | (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' : |
1387 | (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U'; | |
1388 | } | |
1389 | ||
1390 | ||
fd7c092e MP |
1391 | static void mirror_status(struct dm_target *ti, status_type_t type, |
1392 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1393 | { |
315dcc22 | 1394 | unsigned int m, sz = 0; |
ed63287d | 1395 | int num_feature_args = 0; |
1da177e4 | 1396 | struct mirror_set *ms = (struct mirror_set *) ti->private; |
1f965b19 | 1397 | struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); |
65972a6f | 1398 | char buffer[MAX_NR_MIRRORS + 1]; |
1da177e4 | 1399 | |
1da177e4 LT |
1400 | switch (type) { |
1401 | case STATUSTYPE_INFO: | |
1402 | DMEMIT("%d ", ms->nr_mirrors); | |
af195ac8 | 1403 | for (m = 0; m < ms->nr_mirrors; m++) { |
1da177e4 | 1404 | DMEMIT("%s ", ms->mirror[m].dev->name); |
af195ac8 JB |
1405 | buffer[m] = device_status_char(&(ms->mirror[m])); |
1406 | } | |
1407 | buffer[m] = '\0'; | |
1da177e4 | 1408 | |
af195ac8 | 1409 | DMEMIT("%llu/%llu 1 %s ", |
1f965b19 | 1410 | (unsigned long long)log->type->get_sync_count(log), |
af195ac8 | 1411 | (unsigned long long)ms->nr_regions, buffer); |
315dcc22 | 1412 | |
1f965b19 | 1413 | sz += log->type->status(log, type, result+sz, maxlen-sz); |
315dcc22 | 1414 | |
1da177e4 LT |
1415 | break; |
1416 | ||
1417 | case STATUSTYPE_TABLE: | |
1f965b19 | 1418 | sz = log->type->status(log, type, result, maxlen); |
315dcc22 | 1419 | |
e52b8f6d | 1420 | DMEMIT("%d", ms->nr_mirrors); |
1da177e4 | 1421 | for (m = 0; m < ms->nr_mirrors; m++) |
e52b8f6d | 1422 | DMEMIT(" %s %llu", ms->mirror[m].dev->name, |
b80aa7a0 | 1423 | (unsigned long long)ms->mirror[m].offset); |
a8e6afa2 | 1424 | |
ed63287d LZ |
1425 | num_feature_args += !!errors_handled(ms); |
1426 | num_feature_args += !!keep_log(ms); | |
1427 | if (num_feature_args) { | |
1428 | DMEMIT(" %d", num_feature_args); | |
1429 | if (errors_handled(ms)) | |
1430 | DMEMIT(" handle_errors"); | |
1431 | if (keep_log(ms)) | |
1432 | DMEMIT(" keep_log"); | |
1433 | } | |
1434 | ||
1435 | break; | |
8ec45662 TS |
1436 | |
1437 | case STATUSTYPE_IMA: | |
1438 | DMEMIT_TARGET_NAME_VERSION(ti->type); | |
1439 | DMEMIT(",nr_mirrors=%d", ms->nr_mirrors); | |
1440 | for (m = 0; m < ms->nr_mirrors; m++) { | |
1441 | DMEMIT(",mirror_device_%d=%s", m, ms->mirror[m].dev->name); | |
1442 | DMEMIT(",mirror_device_%d_status=%c", | |
1443 | m, device_status_char(&(ms->mirror[m]))); | |
1444 | } | |
1445 | ||
1446 | DMEMIT(",handle_errors=%c", errors_handled(ms) ? 'y' : 'n'); | |
1447 | DMEMIT(",keep_log=%c", keep_log(ms) ? 'y' : 'n'); | |
1448 | ||
1449 | DMEMIT(",log_type_status="); | |
1450 | sz += log->type->status(log, type, result+sz, maxlen-sz); | |
1451 | DMEMIT(";"); | |
1452 | break; | |
1da177e4 | 1453 | } |
1da177e4 LT |
1454 | } |
1455 | ||
af4874e0 MS |
1456 | static int mirror_iterate_devices(struct dm_target *ti, |
1457 | iterate_devices_callout_fn fn, void *data) | |
1458 | { | |
1459 | struct mirror_set *ms = ti->private; | |
1460 | int ret = 0; | |
1461 | unsigned i; | |
1462 | ||
1463 | for (i = 0; !ret && i < ms->nr_mirrors; i++) | |
1464 | ret = fn(ti, ms->mirror[i].dev, | |
5dea271b | 1465 | ms->mirror[i].offset, ti->len, data); |
af4874e0 MS |
1466 | |
1467 | return ret; | |
1468 | } | |
1469 | ||
1da177e4 LT |
1470 | static struct target_type mirror_target = { |
1471 | .name = "mirror", | |
ed63287d | 1472 | .version = {1, 14, 0}, |
1da177e4 LT |
1473 | .module = THIS_MODULE, |
1474 | .ctr = mirror_ctr, | |
1475 | .dtr = mirror_dtr, | |
1476 | .map = mirror_map, | |
1477 | .end_io = mirror_end_io, | |
b80aa7a0 | 1478 | .presuspend = mirror_presuspend, |
1da177e4 LT |
1479 | .postsuspend = mirror_postsuspend, |
1480 | .resume = mirror_resume, | |
1481 | .status = mirror_status, | |
af4874e0 | 1482 | .iterate_devices = mirror_iterate_devices, |
1da177e4 LT |
1483 | }; |
1484 | ||
1485 | static int __init dm_mirror_init(void) | |
1486 | { | |
1487 | int r; | |
1488 | ||
1da177e4 | 1489 | r = dm_register_target(&mirror_target); |
95f8fac8 | 1490 | if (r < 0) { |
0cd33124 | 1491 | DMERR("Failed to register mirror target"); |
95f8fac8 MP |
1492 | goto bad_target; |
1493 | } | |
1494 | ||
1495 | return 0; | |
1da177e4 | 1496 | |
95f8fac8 | 1497 | bad_target: |
1da177e4 LT |
1498 | return r; |
1499 | } | |
1500 | ||
1501 | static void __exit dm_mirror_exit(void) | |
1502 | { | |
10d3bd09 | 1503 | dm_unregister_target(&mirror_target); |
1da177e4 LT |
1504 | } |
1505 | ||
1506 | /* Module hooks */ | |
1507 | module_init(dm_mirror_init); | |
1508 | module_exit(dm_mirror_exit); | |
1509 | ||
1510 | MODULE_DESCRIPTION(DM_NAME " mirror target"); | |
1511 | MODULE_AUTHOR("Joe Thornber"); | |
1512 | MODULE_LICENSE("GPL"); |