Lines Matching +full:data +full:- +full:mirror
3 * Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved.
8 #include "dm-bio-record.h"
16 #include <linux/device-mapper.h>
17 #include <linux/dm-io.h>
18 #include <linux/dm-dirty-log.h>
19 #include <linux/dm-kcopyd.h>
20 #include <linux/dm-region-hash.h>
30 #define errors_handled(p) ((p)->features & DM_RAID1_HANDLE_ERRORS)
31 #define keep_log(p) ((p)->features & DM_RAID1_KEEP_LOG)
35 /*-----------------------------------------------------------------
36 * Mirror set structures.
37 *---------------------------------------------------------------*/
45 struct mirror { struct
76 atomic_t default_mirror; /* Default mirror */
86 struct mirror mirror[]; member
96 queue_work(ms->kmirrord_wq, &ms->kmirrord_work); in wakeup_mirrord()
103 clear_bit(0, &ms->timer_pending); in delayed_wake_fn()
109 if (test_and_set_bit(0, &ms->timer_pending)) in delayed_wake()
112 ms->timer.expires = jiffies + HZ / 5; in delayed_wake()
113 add_timer(&ms->timer); in delayed_wake()
127 bl = (rw == WRITE) ? &ms->writes : &ms->reads; in queue_bio()
128 spin_lock_irqsave(&ms->lock, flags); in queue_bio()
129 should_wake = !(bl->head); in queue_bio()
131 spin_unlock_irqrestore(&ms->lock, flags); in queue_bio()
147 struct mirror *m;
148 /* if details->bi_disk == NULL, details were not saved */
154 * Every mirror should look like this one.
159 * This is yucky. We squirrel the mirror struct away inside
163 static struct mirror *bio_get_m(struct bio *bio) in bio_get_m()
165 return (struct mirror *) bio->bi_next; in bio_get_m()
168 static void bio_set_m(struct bio *bio, struct mirror *m) in bio_set_m()
170 bio->bi_next = (struct bio *) m; in bio_set_m()
173 static struct mirror *get_default_mirror(struct mirror_set *ms) in get_default_mirror()
175 return &ms->mirror[atomic_read(&ms->default_mirror)]; in get_default_mirror()
178 static void set_default_mirror(struct mirror *m) in set_default_mirror()
180 struct mirror_set *ms = m->ms; in set_default_mirror()
181 struct mirror *m0 = &(ms->mirror[0]); in set_default_mirror()
183 atomic_set(&ms->default_mirror, m - m0); in set_default_mirror()
186 static struct mirror *get_valid_mirror(struct mirror_set *ms) in get_valid_mirror()
188 struct mirror *m; in get_valid_mirror()
190 for (m = ms->mirror; m < ms->mirror + ms->nr_mirrors; m++) in get_valid_mirror()
191 if (!atomic_read(&m->error_count)) in get_valid_mirror()
198 * @m: mirror device to fail
207 * only if the mirror is in-sync.
211 static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type) in fail_mirror()
213 struct mirror_set *ms = m->ms; in fail_mirror()
214 struct mirror *new; in fail_mirror()
216 ms->leg_failure = 1; in fail_mirror()
223 atomic_inc(&m->error_count); in fail_mirror()
225 if (test_and_set_bit(error_type, &m->error_type)) in fail_mirror()
234 if (!ms->in_sync && !keep_log(ms)) { in fail_mirror()
237 * than to risk returning corrupt data. in fail_mirror()
239 DMERR("Primary mirror (%s) failed while out-of-sync: " in fail_mirror()
240 "Reads may fail.", m->dev->name); in fail_mirror()
248 DMWARN("All sides of mirror have failed."); in fail_mirror()
251 schedule_work(&ms->trigger_event); in fail_mirror()
256 struct mirror_set *ms = ti->private; in mirror_flush()
261 struct mirror *m; in mirror_flush()
267 .client = ms->io_client, in mirror_flush()
270 for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) { in mirror_flush()
271 io[i].bdev = m->dev->bdev; in mirror_flush()
276 error_bits = -1; in mirror_flush()
277 dm_io(&io_req, ms->nr_mirrors, io, &error_bits); in mirror_flush()
279 for (i = 0; i < ms->nr_mirrors; i++) in mirror_flush()
281 fail_mirror(ms->mirror + i, in mirror_flush()
283 return -EIO; in mirror_flush()
289 /*-----------------------------------------------------------------
292 * When a mirror is first activated we may find that some regions
293 * are in the no-sync state. We have to recover these by
294 * recopying from the default mirror to all the others.
295 *---------------------------------------------------------------*/
304 /* Read error means the failure of default mirror. */ in recovery_complete()
305 DMERR_LIMIT("Unable to read primary mirror during recovery"); in recovery_complete()
313 * Bits correspond to devices (excluding default mirror). in recovery_complete()
314 * The default mirror cannot change during recovery. in recovery_complete()
316 for (m = 0; m < ms->nr_mirrors; m++) { in recovery_complete()
317 if (&ms->mirror[m] == get_default_mirror(ms)) in recovery_complete()
320 fail_mirror(ms->mirror + m, in recovery_complete()
333 struct mirror *m; in recover()
336 sector_t region_size = dm_rh_get_region_size(ms->rh); in recover()
340 from.bdev = m->dev->bdev; in recover()
341 from.sector = m->offset + dm_rh_region_to_sector(ms->rh, key); in recover()
342 if (key == (ms->nr_regions - 1)) { in recover()
347 from.count = ms->ti->len & (region_size - 1); in recover()
354 for (i = 0, dest = to; i < ms->nr_mirrors; i++) { in recover()
355 if (&ms->mirror[i] == get_default_mirror(ms)) in recover()
358 m = ms->mirror + i; in recover()
359 dest->bdev = m->dev->bdev; in recover()
360 dest->sector = m->offset + dm_rh_region_to_sector(ms->rh, key); in recover()
361 dest->count = from.count; in recover()
369 dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, in recover()
377 ms->leg_failure = 0; in reset_ms_flags()
378 for (m = 0; m < ms->nr_mirrors; m++) { in reset_ms_flags()
379 atomic_set(&(ms->mirror[m].error_count), 0); in reset_ms_flags()
380 ms->mirror[m].error_type = 0; in reset_ms_flags()
387 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in do_recovery()
392 dm_rh_recovery_prepare(ms->rh); in do_recovery()
397 while ((reg = dm_rh_recovery_start(ms->rh))) in do_recovery()
403 if (!ms->in_sync && in do_recovery()
404 (log->type->get_sync_count(log) == ms->nr_regions)) { in do_recovery()
406 dm_table_event(ms->ti->table); in do_recovery()
407 ms->in_sync = 1; in do_recovery()
412 /*-----------------------------------------------------------------
414 *---------------------------------------------------------------*/
415 static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) in choose_mirror()
417 struct mirror *m = get_default_mirror(ms); in choose_mirror()
420 if (likely(!atomic_read(&m->error_count))) in choose_mirror()
423 if (m-- == ms->mirror) in choose_mirror()
424 m += ms->nr_mirrors; in choose_mirror()
430 static int default_ok(struct mirror *m) in default_ok()
432 struct mirror *default_mirror = get_default_mirror(m->ms); in default_ok()
434 return !atomic_read(&default_mirror->error_count); in default_ok()
439 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_available()
440 region_t region = dm_rh_bio_to_region(ms->rh, bio); in mirror_available()
442 if (log->type->in_sync(log, region, 0)) in mirror_available()
443 return choose_mirror(ms, bio->bi_iter.bi_sector) ? 1 : 0; in mirror_available()
449 * remap a buffer to a particular mirror.
451 static sector_t map_sector(struct mirror *m, struct bio *bio) in map_sector()
453 if (unlikely(!bio->bi_iter.bi_size)) in map_sector()
455 return m->offset + dm_target_offset(m->ms->ti, bio->bi_iter.bi_sector); in map_sector()
458 static void map_bio(struct mirror *m, struct bio *bio) in map_bio()
460 bio_set_dev(bio, m->dev->bdev); in map_bio()
461 bio->bi_iter.bi_sector = map_sector(m, bio); in map_bio()
464 static void map_region(struct dm_io_region *io, struct mirror *m, in map_region()
467 io->bdev = m->dev->bdev; in map_region()
468 io->sector = map_sector(m, bio); in map_region()
469 io->count = bio_sectors(bio); in map_region()
478 spin_lock_irq(&ms->lock); in hold_bio()
480 if (atomic_read(&ms->suspend)) { in hold_bio()
481 spin_unlock_irq(&ms->lock); in hold_bio()
486 if (dm_noflush_suspending(ms->ti)) in hold_bio()
487 bio->bi_status = BLK_STS_DM_REQUEUE; in hold_bio()
489 bio->bi_status = BLK_STS_IOERR; in hold_bio()
498 bio_list_add(&ms->holds, bio); in hold_bio()
499 spin_unlock_irq(&ms->lock); in hold_bio()
502 /*-----------------------------------------------------------------
504 *---------------------------------------------------------------*/
508 struct mirror *m; in read_callback()
520 if (likely(default_ok(m)) || mirror_available(m->ms, bio)) { in read_callback()
521 DMWARN_LIMIT("Read failure on mirror device %s. " in read_callback()
523 m->dev->name); in read_callback()
524 queue_bio(m->ms, bio, bio_data_dir(bio)); in read_callback()
528 DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.", in read_callback()
529 m->dev->name); in read_callback()
534 static void read_async_bio(struct mirror *m, struct bio *bio) in read_async_bio()
544 .client = m->ms->io_client, in read_async_bio()
555 int state = dm_rh_get_state(ms->rh, region, may_block); in region_in_sync()
563 struct mirror *m; in do_reads()
566 region = dm_rh_bio_to_region(ms->rh, bio); in do_reads()
573 m = choose_mirror(ms, bio->bi_iter.bi_sector); in do_reads()
574 else if (m && atomic_read(&m->error_count)) in do_reads()
584 /*-----------------------------------------------------------------
592 * NOSYNC: increment pending, just write to the default mirror
593 *---------------------------------------------------------------*/
604 ms = bio_get_m(bio)->ms; in write_callback()
623 bio->bi_status = BLK_STS_NOTSUPP; in write_callback()
628 for (i = 0; i < ms->nr_mirrors; i++) in write_callback()
630 fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR); in write_callback()
637 spin_lock_irqsave(&ms->lock, flags); in write_callback()
638 if (!ms->failures.head) in write_callback()
640 bio_list_add(&ms->failures, bio); in write_callback()
641 spin_unlock_irqrestore(&ms->lock, flags); in write_callback()
650 struct mirror *m; in do_write()
653 .bi_op_flags = bio->bi_opf & (REQ_FUA | REQ_PREFLUSH), in do_write()
658 .client = ms->io_client, in do_write()
667 for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) in do_write()
671 * Use default mirror because we only need it to retrieve the reference in do_write()
672 * to the mirror set in write_callback(). in do_write()
676 BUG_ON(dm_io(&io_req, ms->nr_mirrors, io, NULL)); in do_write()
685 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in do_writes()
688 if (!writes->head) in do_writes()
700 if ((bio->bi_opf & REQ_PREFLUSH) || in do_writes()
706 region = dm_rh_bio_to_region(ms->rh, bio); in do_writes()
708 if (log->type->is_remote_recovering && in do_writes()
709 log->type->is_remote_recovering(log, region)) { in do_writes()
714 state = dm_rh_get_state(ms->rh, region, 1); in do_writes()
738 spin_lock_irq(&ms->lock); in do_writes()
739 bio_list_merge(&ms->writes, &requeue); in do_writes()
740 spin_unlock_irq(&ms->lock); in do_writes()
749 dm_rh_inc_pending(ms->rh, &sync); in do_writes()
750 dm_rh_inc_pending(ms->rh, &nosync); in do_writes()
757 ms->log_failure = dm_rh_flush(ms->rh) ? 1 : ms->log_failure; in do_writes()
762 if (unlikely(ms->log_failure) && errors_handled(ms)) { in do_writes()
763 spin_lock_irq(&ms->lock); in do_writes()
764 bio_list_merge(&ms->failures, &sync); in do_writes()
765 spin_unlock_irq(&ms->lock); in do_writes()
772 dm_rh_delay(ms->rh, bio); in do_writes()
775 if (unlikely(ms->leg_failure) && errors_handled(ms) && !keep_log(ms)) { in do_writes()
776 spin_lock_irq(&ms->lock); in do_writes()
777 bio_list_add(&ms->failures, bio); in do_writes()
778 spin_unlock_irq(&ms->lock); in do_writes()
791 if (likely(!failures->head)) in do_failures()
801 * to reconfigure the mirror, at which point the core in do_failures()
812 if (!ms->log_failure) { in do_failures()
813 ms->in_sync = 0; in do_failures()
814 dm_rh_mark_nosync(ms->rh, bio); in do_failures()
830 if (unlikely(!get_valid_mirror(ms) || (keep_log(ms) && ms->log_failure))) in do_failures()
844 dm_table_event(ms->ti->table); in trigger_event()
847 /*-----------------------------------------------------------------
849 *---------------------------------------------------------------*/
857 spin_lock_irqsave(&ms->lock, flags); in do_mirror()
858 reads = ms->reads; in do_mirror()
859 writes = ms->writes; in do_mirror()
860 failures = ms->failures; in do_mirror()
861 bio_list_init(&ms->reads); in do_mirror()
862 bio_list_init(&ms->writes); in do_mirror()
863 bio_list_init(&ms->failures); in do_mirror()
864 spin_unlock_irqrestore(&ms->lock, flags); in do_mirror()
866 dm_rh_update_states(ms->rh, errors_handled(ms)); in do_mirror()
873 /*-----------------------------------------------------------------
875 *---------------------------------------------------------------*/
882 kzalloc(struct_size(ms, mirror, nr_mirrors), GFP_KERNEL); in alloc_context()
885 ti->error = "Cannot allocate mirror context"; in alloc_context()
889 spin_lock_init(&ms->lock); in alloc_context()
890 bio_list_init(&ms->reads); in alloc_context()
891 bio_list_init(&ms->writes); in alloc_context()
892 bio_list_init(&ms->failures); in alloc_context()
893 bio_list_init(&ms->holds); in alloc_context()
895 ms->ti = ti; in alloc_context()
896 ms->nr_mirrors = nr_mirrors; in alloc_context()
897 ms->nr_regions = dm_sector_div_up(ti->len, region_size); in alloc_context()
898 ms->in_sync = 0; in alloc_context()
899 ms->log_failure = 0; in alloc_context()
900 ms->leg_failure = 0; in alloc_context()
901 atomic_set(&ms->suspend, 0); in alloc_context()
902 atomic_set(&ms->default_mirror, DEFAULT_MIRROR); in alloc_context()
904 ms->io_client = dm_io_client_create(); in alloc_context()
905 if (IS_ERR(ms->io_client)) { in alloc_context()
906 ti->error = "Error creating dm_io client"; in alloc_context()
911 ms->rh = dm_region_hash_create(ms, dispatch_bios, wakeup_mirrord, in alloc_context()
913 ms->ti->begin, MAX_RECOVERY, in alloc_context()
914 dl, region_size, ms->nr_regions); in alloc_context()
915 if (IS_ERR(ms->rh)) { in alloc_context()
916 ti->error = "Error creating dirty region hash"; in alloc_context()
917 dm_io_client_destroy(ms->io_client); in alloc_context()
928 while (m--) in free_context()
929 dm_put_device(ti, ms->mirror[m].dev); in free_context()
931 dm_io_client_destroy(ms->io_client); in free_context()
932 dm_region_hash_destroy(ms->rh); in free_context()
937 unsigned int mirror, char **argv) in get_mirror() argument
945 ti->error = "Invalid offset"; in get_mirror()
946 return -EINVAL; in get_mirror()
949 ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), in get_mirror()
950 &ms->mirror[mirror].dev); in get_mirror()
952 ti->error = "Device lookup failure"; in get_mirror()
956 ms->mirror[mirror].ms = ms; in get_mirror()
957 atomic_set(&(ms->mirror[mirror].error_count), 0); in get_mirror()
958 ms->mirror[mirror].error_type = 0; in get_mirror()
959 ms->mirror[mirror].offset = offset; in get_mirror()
976 ti->error = "Insufficient mirror log arguments"; in create_dirty_log()
981 ti->error = "Invalid mirror log argument count"; in create_dirty_log()
988 ti->error = "Insufficient mirror log arguments"; in create_dirty_log()
995 ti->error = "Error creating mirror dirty log"; in create_dirty_log()
1006 struct dm_target *ti = ms->ti; in parse_features()
1016 ti->error = "Invalid number of features"; in parse_features()
1017 return -EINVAL; in parse_features()
1020 argc--; in parse_features()
1025 ti->error = "Not enough arguments to support feature count"; in parse_features()
1026 return -EINVAL; in parse_features()
1031 ms->features |= DM_RAID1_HANDLE_ERRORS; in parse_features()
1033 ms->features |= DM_RAID1_KEEP_LOG; in parse_features()
1035 ti->error = "Unrecognised feature requested"; in parse_features()
1036 return -EINVAL; in parse_features()
1039 argc--; in parse_features()
1044 ti->error = "keep_log feature requires the handle_errors feature"; in parse_features()
1045 return -EINVAL; in parse_features()
1052 * Construct a mirror mapping:
1073 return -EINVAL; in mirror_ctr()
1076 argc -= args_used; in mirror_ctr()
1080 ti->error = "Invalid number of mirrors"; in mirror_ctr()
1082 return -EINVAL; in mirror_ctr()
1085 argv++, argc--; in mirror_ctr()
1088 ti->error = "Too few mirror arguments"; in mirror_ctr()
1090 return -EINVAL; in mirror_ctr()
1093 ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl); in mirror_ctr()
1096 return -ENOMEM; in mirror_ctr()
1099 /* Get the mirror parameter sets */ in mirror_ctr()
1107 argc -= 2; in mirror_ctr()
1110 ti->private = ms; in mirror_ctr()
1112 r = dm_set_target_max_io_len(ti, dm_rh_get_region_size(ms->rh)); in mirror_ctr()
1116 ti->num_flush_bios = 1; in mirror_ctr()
1117 ti->num_discard_bios = 1; in mirror_ctr()
1118 ti->per_io_data_size = sizeof(struct dm_raid1_bio_record); in mirror_ctr()
1120 ms->kmirrord_wq = alloc_workqueue("kmirrord", WQ_MEM_RECLAIM, 0); in mirror_ctr()
1121 if (!ms->kmirrord_wq) { in mirror_ctr()
1123 r = -ENOMEM; in mirror_ctr()
1126 INIT_WORK(&ms->kmirrord_work, do_mirror); in mirror_ctr()
1127 timer_setup(&ms->timer, delayed_wake_fn, 0); in mirror_ctr()
1128 ms->timer_pending = 0; in mirror_ctr()
1129 INIT_WORK(&ms->trigger_event, trigger_event); in mirror_ctr()
1136 argc -= args_used; in mirror_ctr()
1139 * Any read-balancing addition depends on the in mirror_ctr()
1148 ti->error = "Too many mirror arguments"; in mirror_ctr()
1149 r = -EINVAL; in mirror_ctr()
1153 ms->kcopyd_client = dm_kcopyd_client_create(&dm_kcopyd_throttle); in mirror_ctr()
1154 if (IS_ERR(ms->kcopyd_client)) { in mirror_ctr()
1155 r = PTR_ERR(ms->kcopyd_client); in mirror_ctr()
1163 destroy_workqueue(ms->kmirrord_wq); in mirror_ctr()
1165 free_context(ms, ti, ms->nr_mirrors); in mirror_ctr()
1171 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_dtr()
1173 del_timer_sync(&ms->timer); in mirror_dtr()
1174 flush_workqueue(ms->kmirrord_wq); in mirror_dtr()
1175 flush_work(&ms->trigger_event); in mirror_dtr()
1176 dm_kcopyd_client_destroy(ms->kcopyd_client); in mirror_dtr()
1177 destroy_workqueue(ms->kmirrord_wq); in mirror_dtr()
1178 free_context(ms, ti, ms->nr_mirrors); in mirror_dtr()
1182 * Mirror mapping function
1187 struct mirror *m; in mirror_map()
1188 struct mirror_set *ms = ti->private; in mirror_map()
1189 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_map()
1193 bio_record->details.bi_disk = NULL; in mirror_map()
1197 bio_record->write_region = dm_rh_bio_to_region(ms->rh, bio); in mirror_map()
1202 r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0); in mirror_map()
1203 if (r < 0 && r != -EWOULDBLOCK) in mirror_map()
1207 * If region is not in-sync queue the bio. in mirror_map()
1209 if (!r || (r == -EWOULDBLOCK)) { in mirror_map()
1210 if (bio->bi_opf & REQ_RAHEAD) in mirror_map()
1218 * The region is in-sync and we can perform reads directly. in mirror_map()
1221 m = choose_mirror(ms, bio->bi_iter.bi_sector); in mirror_map()
1225 dm_bio_record(&bio_record->details, bio); in mirror_map()
1226 bio_record->m = m; in mirror_map()
1237 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_end_io()
1238 struct mirror *m = NULL; in mirror_end_io()
1247 if (!(bio->bi_opf & REQ_PREFLUSH) && in mirror_end_io()
1249 dm_rh_dec(ms->rh, bio_record->write_region); in mirror_end_io()
1256 if (bio->bi_opf & REQ_RAHEAD) in mirror_end_io()
1260 if (!bio_record->details.bi_disk) { in mirror_end_io()
1264 * mirror in-sync. in mirror_end_io()
1266 DMERR_LIMIT("Mirror read failed."); in mirror_end_io()
1270 m = bio_record->m; in mirror_end_io()
1272 DMERR("Mirror read failed from %s. Trying alternative device.", in mirror_end_io()
1273 m->dev->name); in mirror_end_io()
1279 * mirror. in mirror_end_io()
1282 bd = &bio_record->details; in mirror_end_io()
1285 bio_record->details.bi_disk = NULL; in mirror_end_io()
1286 bio->bi_status = 0; in mirror_end_io()
1295 bio_record->details.bi_disk = NULL; in mirror_end_io()
1302 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_presuspend()
1303 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_presuspend()
1308 atomic_set(&ms->suspend, 1); in mirror_presuspend()
1313 * a chance to be added in the hold list because ms->suspend in mirror_presuspend()
1316 spin_lock_irq(&ms->lock); in mirror_presuspend()
1317 holds = ms->holds; in mirror_presuspend()
1318 bio_list_init(&ms->holds); in mirror_presuspend()
1319 spin_unlock_irq(&ms->lock); in mirror_presuspend()
1328 dm_rh_stop_recovery(ms->rh); in mirror_presuspend()
1331 !dm_rh_recovery_in_flight(ms->rh)); in mirror_presuspend()
1333 if (log->type->presuspend && log->type->presuspend(log)) in mirror_presuspend()
1343 flush_workqueue(ms->kmirrord_wq); in mirror_presuspend()
1348 struct mirror_set *ms = ti->private; in mirror_postsuspend()
1349 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_postsuspend()
1351 if (log->type->postsuspend && log->type->postsuspend(log)) in mirror_postsuspend()
1358 struct mirror_set *ms = ti->private; in mirror_resume()
1359 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_resume()
1361 atomic_set(&ms->suspend, 0); in mirror_resume()
1362 if (log->type->resume && log->type->resume(log)) in mirror_resume()
1365 dm_rh_start_recovery(ms->rh); in mirror_resume()
1370 * @m: mirror device/leg we want the status of
1374 * A => Alive - No failures
1375 * D => Dead - A write failure occurred leaving mirror out-of-sync
1376 * S => Sync - A sychronization failure occurred, mirror out-of-sync
1377 * R => Read - A read failure occurred, mirror data unaffected
1381 static char device_status_char(struct mirror *m) in device_status_char()
1383 if (!atomic_read(&(m->error_count))) in device_status_char()
1386 return (test_bit(DM_RAID1_FLUSH_ERROR, &(m->error_type))) ? 'F' : in device_status_char()
1387 (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' : in device_status_char()
1388 (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' : in device_status_char()
1389 (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U'; in device_status_char()
1398 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_status()
1399 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_status()
1404 DMEMIT("%d ", ms->nr_mirrors); in mirror_status()
1405 for (m = 0; m < ms->nr_mirrors; m++) { in mirror_status()
1406 DMEMIT("%s ", ms->mirror[m].dev->name); in mirror_status()
1407 buffer[m] = device_status_char(&(ms->mirror[m])); in mirror_status()
1412 (unsigned long long)log->type->get_sync_count(log), in mirror_status()
1413 (unsigned long long)ms->nr_regions, buffer); in mirror_status()
1415 sz += log->type->status(log, type, result+sz, maxlen-sz); in mirror_status()
1420 sz = log->type->status(log, type, result, maxlen); in mirror_status()
1422 DMEMIT("%d", ms->nr_mirrors); in mirror_status()
1423 for (m = 0; m < ms->nr_mirrors; m++) in mirror_status()
1424 DMEMIT(" %s %llu", ms->mirror[m].dev->name, in mirror_status()
1425 (unsigned long long)ms->mirror[m].offset); in mirror_status()
1442 iterate_devices_callout_fn fn, void *data) in mirror_iterate_devices() argument
1444 struct mirror_set *ms = ti->private; in mirror_iterate_devices()
1448 for (i = 0; !ret && i < ms->nr_mirrors; i++) in mirror_iterate_devices()
1449 ret = fn(ti, ms->mirror[i].dev, in mirror_iterate_devices()
1450 ms->mirror[i].offset, ti->len, data); in mirror_iterate_devices()
1456 .name = "mirror",
1476 DMERR("Failed to register mirror target"); in dm_mirror_init()
1495 MODULE_DESCRIPTION(DM_NAME " mirror target");