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_bdev == 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()
266 .client = ms->io_client, in mirror_flush()
269 for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) { in mirror_flush()
270 io[i].bdev = m->dev->bdev; in mirror_flush()
275 error_bits = -1; in mirror_flush()
276 dm_io(&io_req, ms->nr_mirrors, io, &error_bits); in mirror_flush()
278 for (i = 0; i < ms->nr_mirrors; i++) in mirror_flush()
280 fail_mirror(ms->mirror + i, in mirror_flush()
282 return -EIO; in mirror_flush()
288 /*-----------------------------------------------------------------
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 *---------------------------------------------------------------*/
303 /* Read error means the failure of default mirror. */ in recovery_complete()
304 DMERR_LIMIT("Unable to read primary mirror during recovery"); in recovery_complete()
312 * Bits correspond to devices (excluding default mirror). in recovery_complete()
313 * The default mirror cannot change during recovery. in recovery_complete()
315 for (m = 0; m < ms->nr_mirrors; m++) { in recovery_complete()
316 if (&ms->mirror[m] == get_default_mirror(ms)) in recovery_complete()
319 fail_mirror(ms->mirror + m, in recovery_complete()
332 struct mirror *m; in recover()
335 sector_t region_size = dm_rh_get_region_size(ms->rh); in recover()
339 from.bdev = m->dev->bdev; in recover()
340 from.sector = m->offset + dm_rh_region_to_sector(ms->rh, key); in recover()
341 if (key == (ms->nr_regions - 1)) { in recover()
346 from.count = ms->ti->len & (region_size - 1); in recover()
353 for (i = 0, dest = to; i < ms->nr_mirrors; i++) { in recover()
354 if (&ms->mirror[i] == get_default_mirror(ms)) in recover()
357 m = ms->mirror + i; in recover()
358 dest->bdev = m->dev->bdev; in recover()
359 dest->sector = m->offset + dm_rh_region_to_sector(ms->rh, key); in recover()
360 dest->count = from.count; in recover()
368 dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, in recover()
376 ms->leg_failure = 0; in reset_ms_flags()
377 for (m = 0; m < ms->nr_mirrors; m++) { in reset_ms_flags()
378 atomic_set(&(ms->mirror[m].error_count), 0); in reset_ms_flags()
379 ms->mirror[m].error_type = 0; in reset_ms_flags()
386 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in do_recovery()
391 dm_rh_recovery_prepare(ms->rh); in do_recovery()
396 while ((reg = dm_rh_recovery_start(ms->rh))) in do_recovery()
402 if (!ms->in_sync && in do_recovery()
403 (log->type->get_sync_count(log) == ms->nr_regions)) { in do_recovery()
405 dm_table_event(ms->ti->table); in do_recovery()
406 ms->in_sync = 1; in do_recovery()
411 /*-----------------------------------------------------------------
413 *---------------------------------------------------------------*/
414 static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) in choose_mirror()
416 struct mirror *m = get_default_mirror(ms); in choose_mirror()
419 if (likely(!atomic_read(&m->error_count))) in choose_mirror()
422 if (m-- == ms->mirror) in choose_mirror()
423 m += ms->nr_mirrors; in choose_mirror()
429 static int default_ok(struct mirror *m) in default_ok()
431 struct mirror *default_mirror = get_default_mirror(m->ms); in default_ok()
433 return !atomic_read(&default_mirror->error_count); in default_ok()
438 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_available()
439 region_t region = dm_rh_bio_to_region(ms->rh, bio); in mirror_available()
441 if (log->type->in_sync(log, region, 0)) in mirror_available()
442 return choose_mirror(ms, bio->bi_iter.bi_sector) ? 1 : 0; in mirror_available()
448 * remap a buffer to a particular mirror.
450 static sector_t map_sector(struct mirror *m, struct bio *bio) in map_sector()
452 if (unlikely(!bio->bi_iter.bi_size)) in map_sector()
454 return m->offset + dm_target_offset(m->ms->ti, bio->bi_iter.bi_sector); in map_sector()
457 static void map_bio(struct mirror *m, struct bio *bio) in map_bio()
459 bio_set_dev(bio, m->dev->bdev); in map_bio()
460 bio->bi_iter.bi_sector = map_sector(m, bio); in map_bio()
463 static void map_region(struct dm_io_region *io, struct mirror *m, in map_region()
466 io->bdev = m->dev->bdev; in map_region()
467 io->sector = map_sector(m, bio); in map_region()
468 io->count = bio_sectors(bio); in map_region()
477 spin_lock_irq(&ms->lock); in hold_bio()
479 if (atomic_read(&ms->suspend)) { in hold_bio()
480 spin_unlock_irq(&ms->lock); in hold_bio()
485 if (dm_noflush_suspending(ms->ti)) in hold_bio()
486 bio->bi_status = BLK_STS_DM_REQUEUE; in hold_bio()
488 bio->bi_status = BLK_STS_IOERR; in hold_bio()
497 bio_list_add(&ms->holds, bio); in hold_bio()
498 spin_unlock_irq(&ms->lock); in hold_bio()
501 /*-----------------------------------------------------------------
503 *---------------------------------------------------------------*/
507 struct mirror *m; in read_callback()
519 if (likely(default_ok(m)) || mirror_available(m->ms, bio)) { in read_callback()
520 DMWARN_LIMIT("Read failure on mirror device %s. " in read_callback()
522 m->dev->name); in read_callback()
523 queue_bio(m->ms, bio, bio_data_dir(bio)); in read_callback()
527 DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.", in read_callback()
528 m->dev->name); in read_callback()
533 static void read_async_bio(struct mirror *m, struct bio *bio) in read_async_bio()
542 .client = m->ms->io_client, in read_async_bio()
553 int state = dm_rh_get_state(ms->rh, region, may_block); in region_in_sync()
561 struct mirror *m; in do_reads()
564 region = dm_rh_bio_to_region(ms->rh, bio); in do_reads()
571 m = choose_mirror(ms, bio->bi_iter.bi_sector); in do_reads()
572 else if (m && atomic_read(&m->error_count)) in do_reads()
582 /*-----------------------------------------------------------------
590 * NOSYNC: increment pending, just write to the default mirror
591 *---------------------------------------------------------------*/
602 ms = bio_get_m(bio)->ms; in write_callback()
621 bio->bi_status = BLK_STS_NOTSUPP; in write_callback()
626 for (i = 0; i < ms->nr_mirrors; i++) in write_callback()
628 fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR); in write_callback()
635 spin_lock_irqsave(&ms->lock, flags); in write_callback()
636 if (!ms->failures.head) in write_callback()
638 bio_list_add(&ms->failures, bio); in write_callback()
639 spin_unlock_irqrestore(&ms->lock, flags); in write_callback()
648 struct mirror *m; in do_write()
649 blk_opf_t op_flags = bio->bi_opf & (REQ_FUA | REQ_PREFLUSH); in do_write()
656 .client = ms->io_client, in do_write()
665 for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) in do_write()
669 * Use default mirror because we only need it to retrieve the reference in do_write()
670 * to the mirror set in write_callback(). in do_write()
674 BUG_ON(dm_io(&io_req, ms->nr_mirrors, io, NULL)); in do_write()
683 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in do_writes()
686 if (!writes->head) in do_writes()
698 if ((bio->bi_opf & REQ_PREFLUSH) || in do_writes()
704 region = dm_rh_bio_to_region(ms->rh, bio); in do_writes()
706 if (log->type->is_remote_recovering && in do_writes()
707 log->type->is_remote_recovering(log, region)) { in do_writes()
712 state = dm_rh_get_state(ms->rh, region, 1); in do_writes()
736 spin_lock_irq(&ms->lock); in do_writes()
737 bio_list_merge(&ms->writes, &requeue); in do_writes()
738 spin_unlock_irq(&ms->lock); in do_writes()
747 dm_rh_inc_pending(ms->rh, &sync); in do_writes()
748 dm_rh_inc_pending(ms->rh, &nosync); in do_writes()
755 ms->log_failure = dm_rh_flush(ms->rh) ? 1 : ms->log_failure; in do_writes()
760 if (unlikely(ms->log_failure) && errors_handled(ms)) { in do_writes()
761 spin_lock_irq(&ms->lock); in do_writes()
762 bio_list_merge(&ms->failures, &sync); in do_writes()
763 spin_unlock_irq(&ms->lock); in do_writes()
770 dm_rh_delay(ms->rh, bio); in do_writes()
773 if (unlikely(ms->leg_failure) && errors_handled(ms) && !keep_log(ms)) { in do_writes()
774 spin_lock_irq(&ms->lock); in do_writes()
775 bio_list_add(&ms->failures, bio); in do_writes()
776 spin_unlock_irq(&ms->lock); in do_writes()
789 if (likely(!failures->head)) in do_failures()
799 * to reconfigure the mirror, at which point the core in do_failures()
810 if (!ms->log_failure) { in do_failures()
811 ms->in_sync = 0; in do_failures()
812 dm_rh_mark_nosync(ms->rh, bio); in do_failures()
828 if (unlikely(!get_valid_mirror(ms) || (keep_log(ms) && ms->log_failure))) in do_failures()
842 dm_table_event(ms->ti->table); in trigger_event()
845 /*-----------------------------------------------------------------
847 *---------------------------------------------------------------*/
855 spin_lock_irqsave(&ms->lock, flags); in do_mirror()
856 reads = ms->reads; in do_mirror()
857 writes = ms->writes; in do_mirror()
858 failures = ms->failures; in do_mirror()
859 bio_list_init(&ms->reads); in do_mirror()
860 bio_list_init(&ms->writes); in do_mirror()
861 bio_list_init(&ms->failures); in do_mirror()
862 spin_unlock_irqrestore(&ms->lock, flags); in do_mirror()
864 dm_rh_update_states(ms->rh, errors_handled(ms)); in do_mirror()
871 /*-----------------------------------------------------------------
873 *---------------------------------------------------------------*/
880 kzalloc(struct_size(ms, mirror, nr_mirrors), GFP_KERNEL); in alloc_context()
883 ti->error = "Cannot allocate mirror context"; in alloc_context()
887 spin_lock_init(&ms->lock); in alloc_context()
888 bio_list_init(&ms->reads); in alloc_context()
889 bio_list_init(&ms->writes); in alloc_context()
890 bio_list_init(&ms->failures); in alloc_context()
891 bio_list_init(&ms->holds); in alloc_context()
893 ms->ti = ti; in alloc_context()
894 ms->nr_mirrors = nr_mirrors; in alloc_context()
895 ms->nr_regions = dm_sector_div_up(ti->len, region_size); in alloc_context()
896 ms->in_sync = 0; in alloc_context()
897 ms->log_failure = 0; in alloc_context()
898 ms->leg_failure = 0; in alloc_context()
899 atomic_set(&ms->suspend, 0); in alloc_context()
900 atomic_set(&ms->default_mirror, DEFAULT_MIRROR); in alloc_context()
902 ms->io_client = dm_io_client_create(); in alloc_context()
903 if (IS_ERR(ms->io_client)) { in alloc_context()
904 ti->error = "Error creating dm_io client"; in alloc_context()
909 ms->rh = dm_region_hash_create(ms, dispatch_bios, wakeup_mirrord, in alloc_context()
911 ms->ti->begin, MAX_RECOVERY, in alloc_context()
912 dl, region_size, ms->nr_regions); in alloc_context()
913 if (IS_ERR(ms->rh)) { in alloc_context()
914 ti->error = "Error creating dirty region hash"; in alloc_context()
915 dm_io_client_destroy(ms->io_client); in alloc_context()
926 while (m--) in free_context()
927 dm_put_device(ti, ms->mirror[m].dev); in free_context()
929 dm_io_client_destroy(ms->io_client); in free_context()
930 dm_region_hash_destroy(ms->rh); in free_context()
935 unsigned int mirror, char **argv) in get_mirror() argument
943 ti->error = "Invalid offset"; in get_mirror()
944 return -EINVAL; in get_mirror()
947 ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), in get_mirror()
948 &ms->mirror[mirror].dev); in get_mirror()
950 ti->error = "Device lookup failure"; in get_mirror()
954 ms->mirror[mirror].ms = ms; in get_mirror()
955 atomic_set(&(ms->mirror[mirror].error_count), 0); in get_mirror()
956 ms->mirror[mirror].error_type = 0; in get_mirror()
957 ms->mirror[mirror].offset = offset; in get_mirror()
974 ti->error = "Insufficient mirror log arguments"; in create_dirty_log()
979 ti->error = "Invalid mirror log argument count"; in create_dirty_log()
986 ti->error = "Insufficient mirror log arguments"; in create_dirty_log()
993 ti->error = "Error creating mirror dirty log"; in create_dirty_log()
1004 struct dm_target *ti = ms->ti; in parse_features()
1014 ti->error = "Invalid number of features"; in parse_features()
1015 return -EINVAL; in parse_features()
1018 argc--; in parse_features()
1023 ti->error = "Not enough arguments to support feature count"; in parse_features()
1024 return -EINVAL; in parse_features()
1029 ms->features |= DM_RAID1_HANDLE_ERRORS; in parse_features()
1031 ms->features |= DM_RAID1_KEEP_LOG; in parse_features()
1033 ti->error = "Unrecognised feature requested"; in parse_features()
1034 return -EINVAL; in parse_features()
1037 argc--; in parse_features()
1042 ti->error = "keep_log feature requires the handle_errors feature"; in parse_features()
1043 return -EINVAL; in parse_features()
1050 * Construct a mirror mapping:
1071 return -EINVAL; in mirror_ctr()
1074 argc -= args_used; in mirror_ctr()
1078 ti->error = "Invalid number of mirrors"; in mirror_ctr()
1080 return -EINVAL; in mirror_ctr()
1083 argv++, argc--; in mirror_ctr()
1086 ti->error = "Too few mirror arguments"; in mirror_ctr()
1088 return -EINVAL; in mirror_ctr()
1091 ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl); in mirror_ctr()
1094 return -ENOMEM; in mirror_ctr()
1097 /* Get the mirror parameter sets */ in mirror_ctr()
1105 argc -= 2; in mirror_ctr()
1108 ti->private = ms; in mirror_ctr()
1110 r = dm_set_target_max_io_len(ti, dm_rh_get_region_size(ms->rh)); in mirror_ctr()
1114 ti->num_flush_bios = 1; in mirror_ctr()
1115 ti->num_discard_bios = 1; in mirror_ctr()
1116 ti->per_io_data_size = sizeof(struct dm_raid1_bio_record); in mirror_ctr()
1118 ms->kmirrord_wq = alloc_workqueue("kmirrord", WQ_MEM_RECLAIM, 0); in mirror_ctr()
1119 if (!ms->kmirrord_wq) { in mirror_ctr()
1121 r = -ENOMEM; in mirror_ctr()
1124 INIT_WORK(&ms->kmirrord_work, do_mirror); in mirror_ctr()
1125 timer_setup(&ms->timer, delayed_wake_fn, 0); in mirror_ctr()
1126 ms->timer_pending = 0; in mirror_ctr()
1127 INIT_WORK(&ms->trigger_event, trigger_event); in mirror_ctr()
1134 argc -= args_used; in mirror_ctr()
1137 * Any read-balancing addition depends on the in mirror_ctr()
1146 ti->error = "Too many mirror arguments"; in mirror_ctr()
1147 r = -EINVAL; in mirror_ctr()
1151 ms->kcopyd_client = dm_kcopyd_client_create(&dm_kcopyd_throttle); in mirror_ctr()
1152 if (IS_ERR(ms->kcopyd_client)) { in mirror_ctr()
1153 r = PTR_ERR(ms->kcopyd_client); in mirror_ctr()
1161 destroy_workqueue(ms->kmirrord_wq); in mirror_ctr()
1163 free_context(ms, ti, ms->nr_mirrors); in mirror_ctr()
1169 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_dtr()
1171 del_timer_sync(&ms->timer); in mirror_dtr()
1172 flush_workqueue(ms->kmirrord_wq); in mirror_dtr()
1173 flush_work(&ms->trigger_event); in mirror_dtr()
1174 dm_kcopyd_client_destroy(ms->kcopyd_client); in mirror_dtr()
1175 destroy_workqueue(ms->kmirrord_wq); in mirror_dtr()
1176 free_context(ms, ti, ms->nr_mirrors); in mirror_dtr()
1180 * Mirror mapping function
1185 struct mirror *m; in mirror_map()
1186 struct mirror_set *ms = ti->private; in mirror_map()
1187 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_map()
1191 bio_record->details.bi_bdev = NULL; in mirror_map()
1195 bio_record->write_region = dm_rh_bio_to_region(ms->rh, bio); in mirror_map()
1200 r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0); in mirror_map()
1201 if (r < 0 && r != -EWOULDBLOCK) in mirror_map()
1205 * If region is not in-sync queue the bio. in mirror_map()
1207 if (!r || (r == -EWOULDBLOCK)) { in mirror_map()
1208 if (bio->bi_opf & REQ_RAHEAD) in mirror_map()
1216 * The region is in-sync and we can perform reads directly. in mirror_map()
1219 m = choose_mirror(ms, bio->bi_iter.bi_sector); in mirror_map()
1223 dm_bio_record(&bio_record->details, bio); in mirror_map()
1224 bio_record->m = m; in mirror_map()
1235 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_end_io()
1236 struct mirror *m = NULL; in mirror_end_io()
1245 if (!(bio->bi_opf & REQ_PREFLUSH) && in mirror_end_io()
1247 dm_rh_dec(ms->rh, bio_record->write_region); in mirror_end_io()
1254 if (bio->bi_opf & REQ_RAHEAD) in mirror_end_io()
1258 if (!bio_record->details.bi_bdev) { in mirror_end_io()
1262 * mirror in-sync. in mirror_end_io()
1264 DMERR_LIMIT("Mirror read failed."); in mirror_end_io()
1268 m = bio_record->m; in mirror_end_io()
1270 DMERR("Mirror read failed from %s. Trying alternative device.", in mirror_end_io()
1271 m->dev->name); in mirror_end_io()
1277 * mirror. in mirror_end_io()
1280 bd = &bio_record->details; in mirror_end_io()
1283 bio_record->details.bi_bdev = NULL; in mirror_end_io()
1284 bio->bi_status = 0; in mirror_end_io()
1293 bio_record->details.bi_bdev = NULL; in mirror_end_io()
1300 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_presuspend()
1301 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_presuspend()
1306 atomic_set(&ms->suspend, 1); in mirror_presuspend()
1311 * a chance to be added in the hold list because ms->suspend in mirror_presuspend()
1314 spin_lock_irq(&ms->lock); in mirror_presuspend()
1315 holds = ms->holds; in mirror_presuspend()
1316 bio_list_init(&ms->holds); in mirror_presuspend()
1317 spin_unlock_irq(&ms->lock); in mirror_presuspend()
1326 dm_rh_stop_recovery(ms->rh); in mirror_presuspend()
1329 !dm_rh_recovery_in_flight(ms->rh)); in mirror_presuspend()
1331 if (log->type->presuspend && log->type->presuspend(log)) in mirror_presuspend()
1341 flush_workqueue(ms->kmirrord_wq); in mirror_presuspend()
1346 struct mirror_set *ms = ti->private; in mirror_postsuspend()
1347 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_postsuspend()
1349 if (log->type->postsuspend && log->type->postsuspend(log)) in mirror_postsuspend()
1356 struct mirror_set *ms = ti->private; in mirror_resume()
1357 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_resume()
1359 atomic_set(&ms->suspend, 0); in mirror_resume()
1360 if (log->type->resume && log->type->resume(log)) in mirror_resume()
1363 dm_rh_start_recovery(ms->rh); in mirror_resume()
1368 * @m: mirror device/leg we want the status of
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
1379 static char device_status_char(struct mirror *m) in device_status_char()
1381 if (!atomic_read(&(m->error_count))) in device_status_char()
1384 return (test_bit(DM_RAID1_FLUSH_ERROR, &(m->error_type))) ? 'F' : in device_status_char()
1385 (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' : in device_status_char()
1386 (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' : in device_status_char()
1387 (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U'; in device_status_char()
1396 struct mirror_set *ms = (struct mirror_set *) ti->private; in mirror_status()
1397 struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); in mirror_status()
1402 DMEMIT("%d ", ms->nr_mirrors); in mirror_status()
1403 for (m = 0; m < ms->nr_mirrors; m++) { in mirror_status()
1404 DMEMIT("%s ", ms->mirror[m].dev->name); in mirror_status()
1405 buffer[m] = device_status_char(&(ms->mirror[m])); in mirror_status()
1410 (unsigned long long)log->type->get_sync_count(log), in mirror_status()
1411 (unsigned long long)ms->nr_regions, buffer); in mirror_status()
1413 sz += log->type->status(log, type, result+sz, maxlen-sz); in mirror_status()
1418 sz = log->type->status(log, type, result, maxlen); in mirror_status()
1420 DMEMIT("%d", ms->nr_mirrors); in mirror_status()
1421 for (m = 0; m < ms->nr_mirrors; m++) in mirror_status()
1422 DMEMIT(" %s %llu", ms->mirror[m].dev->name, in mirror_status()
1423 (unsigned long long)ms->mirror[m].offset); in mirror_status()
1438 DMEMIT_TARGET_NAME_VERSION(ti->type); in mirror_status()
1439 DMEMIT(",nr_mirrors=%d", ms->nr_mirrors); in mirror_status()
1440 for (m = 0; m < ms->nr_mirrors; m++) { in mirror_status()
1441 DMEMIT(",mirror_device_%d=%s", m, ms->mirror[m].dev->name); in mirror_status()
1443 m, device_status_char(&(ms->mirror[m]))); in mirror_status()
1450 sz += log->type->status(log, type, result+sz, maxlen-sz); in mirror_status()
1457 iterate_devices_callout_fn fn, void *data) in mirror_iterate_devices() argument
1459 struct mirror_set *ms = ti->private; in mirror_iterate_devices()
1463 for (i = 0; !ret && i < ms->nr_mirrors; i++) in mirror_iterate_devices()
1464 ret = fn(ti, ms->mirror[i].dev, in mirror_iterate_devices()
1465 ms->mirror[i].offset, ti->len, data); in mirror_iterate_devices()
1471 .name = "mirror",
1491 DMERR("Failed to register mirror target"); in dm_mirror_init()
1510 MODULE_DESCRIPTION(DM_NAME " mirror target");