2 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/limits.h>
36 #include <sys/mutex.h>
38 #include <sys/sysctl.h>
39 #include <sys/malloc.h>
40 #include <sys/eventhandler.h>
42 #include <geom/geom.h>
44 #include <sys/kthread.h>
45 #include <sys/sched.h>
46 #include <geom/mirror/g_mirror.h>
49 static MALLOC_DEFINE(M_MIRROR, "mirror data", "GEOM_MIRROR Data");
51 SYSCTL_DECL(_kern_geom);
52 SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff");
53 u_int g_mirror_debug = 0;
54 TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug);
55 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0,
57 static u_int g_mirror_timeout = 4;
58 TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout);
59 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout,
60 0, "Time to wait on all mirror components");
61 static u_int g_mirror_idletime = 5;
62 TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime);
63 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW,
64 &g_mirror_idletime, 0, "Mark components as clean when idling");
65 static u_int g_mirror_reqs_per_sync = 5;
66 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, reqs_per_sync, CTLFLAG_RW,
67 &g_mirror_reqs_per_sync, 0,
68 "Number of regular I/O requests per synchronization request");
69 static u_int g_mirror_syncs_per_sec = 1000;
70 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, syncs_per_sec, CTLFLAG_RW,
71 &g_mirror_syncs_per_sec, 0,
72 "Number of synchronizations requests per second");
74 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
75 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
76 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
77 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
80 static eventhandler_tag g_mirror_ehtag = NULL;
82 static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp,
84 static g_taste_t g_mirror_taste;
85 static void g_mirror_init(struct g_class *mp);
86 static void g_mirror_fini(struct g_class *mp);
88 struct g_class g_mirror_class = {
89 .name = G_MIRROR_CLASS_NAME,
91 .ctlreq = g_mirror_config,
92 .taste = g_mirror_taste,
93 .destroy_geom = g_mirror_destroy_geom,
94 .init = g_mirror_init,
99 static void g_mirror_destroy_provider(struct g_mirror_softc *sc);
100 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state);
101 static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force);
102 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent,
103 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
104 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type);
108 g_mirror_disk_state2str(int state)
112 case G_MIRROR_DISK_STATE_NONE:
114 case G_MIRROR_DISK_STATE_NEW:
116 case G_MIRROR_DISK_STATE_ACTIVE:
118 case G_MIRROR_DISK_STATE_STALE:
120 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
121 return ("SYNCHRONIZING");
122 case G_MIRROR_DISK_STATE_DISCONNECTED:
123 return ("DISCONNECTED");
124 case G_MIRROR_DISK_STATE_DESTROY:
132 g_mirror_device_state2str(int state)
136 case G_MIRROR_DEVICE_STATE_STARTING:
138 case G_MIRROR_DEVICE_STATE_RUNNING:
146 g_mirror_get_diskname(struct g_mirror_disk *disk)
149 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
150 return ("[unknown]");
151 return (disk->d_name);
155 * --- Events handling functions ---
156 * Events in geom_mirror are used to maintain disks and device status
157 * from one thread to simplify locking.
160 g_mirror_event_free(struct g_mirror_event *ep)
167 g_mirror_event_send(void *arg, int state, int flags)
169 struct g_mirror_softc *sc;
170 struct g_mirror_disk *disk;
171 struct g_mirror_event *ep;
174 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK);
175 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep);
176 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) {
187 mtx_lock(&sc->sc_events_mtx);
188 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
189 mtx_unlock(&sc->sc_events_mtx);
190 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
191 mtx_lock(&sc->sc_queue_mtx);
193 mtx_unlock(&sc->sc_queue_mtx);
194 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0)
197 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
199 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) {
200 mtx_lock(&sc->sc_events_mtx);
201 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event",
204 /* Don't even try to use 'sc' here, because it could be already dead. */
207 g_mirror_event_free(ep);
211 static struct g_mirror_event *
212 g_mirror_event_get(struct g_mirror_softc *sc)
214 struct g_mirror_event *ep;
216 mtx_lock(&sc->sc_events_mtx);
217 ep = TAILQ_FIRST(&sc->sc_events);
218 mtx_unlock(&sc->sc_events_mtx);
223 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep)
226 mtx_lock(&sc->sc_events_mtx);
227 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
228 mtx_unlock(&sc->sc_events_mtx);
232 g_mirror_event_cancel(struct g_mirror_disk *disk)
234 struct g_mirror_softc *sc;
235 struct g_mirror_event *ep, *tmpep;
240 mtx_lock(&sc->sc_events_mtx);
241 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
242 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0)
244 if (ep->e_disk != disk)
246 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
247 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
248 g_mirror_event_free(ep);
250 ep->e_error = ECANCELED;
254 mtx_unlock(&sc->sc_events_mtx);
258 * Return the number of disks in given state.
259 * If state is equal to -1, count all connected disks.
262 g_mirror_ndisks(struct g_mirror_softc *sc, int state)
264 struct g_mirror_disk *disk;
267 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
268 if (state == -1 || disk->d_state == state)
275 * Find a disk in mirror by its disk ID.
277 static struct g_mirror_disk *
278 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id)
280 struct g_mirror_disk *disk;
284 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
285 if (disk->d_id == id)
292 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp)
297 mtx_lock(&sc->sc_queue_mtx);
298 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
299 if (bp->bio_from == cp)
302 mtx_unlock(&sc->sc_queue_mtx);
307 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp)
312 "I/O requests for %s exist, can't destroy it now.",
316 if (g_mirror_nrequests(sc, cp) > 0) {
318 "I/O requests for %s in queue, can't destroy it now.",
326 g_mirror_destroy_consumer(void *arg, int flags __unused)
328 struct g_consumer *cp;
331 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
333 g_destroy_consumer(cp);
337 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
339 struct g_provider *pp;
345 if (g_mirror_is_busy(sc, cp))
350 if ((pp->geom->flags & G_GEOM_WITHER) == 0)
353 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
354 -cp->acw, -cp->ace, 0);
355 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
356 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
359 * After retaste event was send (inside g_access()), we can send
360 * event to detach and destroy consumer.
361 * A class, which has consumer to the given provider connected
362 * will not receive retaste event for the provider.
363 * This is the way how I ignore retaste events when I close
364 * consumers opened for write: I detach and destroy consumer
365 * after retaste event is sent.
367 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL);
370 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name);
372 g_destroy_consumer(cp);
376 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp)
378 struct g_consumer *cp;
382 KASSERT(disk->d_consumer == NULL,
383 ("Disk already connected (device %s).", disk->d_softc->sc_name));
385 cp = g_new_consumer(disk->d_softc->sc_geom);
386 error = g_attach(cp, pp);
388 g_destroy_consumer(cp);
391 error = g_access(cp, 1, 1, 1);
394 g_destroy_consumer(cp);
395 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).",
399 disk->d_consumer = cp;
400 disk->d_consumer->private = disk;
401 disk->d_consumer->index = 0;
403 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk));
408 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
415 if (cp->provider != NULL)
416 g_mirror_kill_consumer(sc, cp);
418 g_destroy_consumer(cp);
422 * Initialize disk. This means allocate memory, create consumer, attach it
423 * to the provider and open access (r1w1e1) to it.
425 static struct g_mirror_disk *
426 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp,
427 struct g_mirror_metadata *md, int *errorp)
429 struct g_mirror_disk *disk;
432 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO);
438 error = g_mirror_connect_disk(disk, pp);
441 disk->d_id = md->md_did;
442 disk->d_state = G_MIRROR_DISK_STATE_NONE;
443 disk->d_priority = md->md_priority;
444 disk->d_delay.sec = 0;
445 disk->d_delay.frac = 0;
446 binuptime(&disk->d_last_used);
447 disk->d_flags = md->md_dflags;
448 if (md->md_provider[0] != '\0')
449 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED;
450 disk->d_sync.ds_consumer = NULL;
451 disk->d_sync.ds_offset = md->md_sync_offset;
452 disk->d_sync.ds_offset_done = md->md_sync_offset;
453 disk->d_sync.ds_resync = -1;
454 disk->d_genid = md->md_genid;
455 disk->d_sync.ds_syncid = md->md_syncid;
463 free(disk, M_MIRROR);
468 g_mirror_destroy_disk(struct g_mirror_disk *disk)
470 struct g_mirror_softc *sc;
474 LIST_REMOVE(disk, d_next);
475 g_mirror_event_cancel(disk);
477 if (sc->sc_hint == disk)
479 switch (disk->d_state) {
480 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
481 g_mirror_sync_stop(disk, 1);
483 case G_MIRROR_DISK_STATE_NEW:
484 case G_MIRROR_DISK_STATE_STALE:
485 case G_MIRROR_DISK_STATE_ACTIVE:
486 g_mirror_disconnect_consumer(sc, disk->d_consumer);
487 free(disk, M_MIRROR);
490 KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
491 g_mirror_get_diskname(disk),
492 g_mirror_disk_state2str(disk->d_state)));
497 g_mirror_destroy_device(struct g_mirror_softc *sc)
499 struct g_mirror_disk *disk;
500 struct g_mirror_event *ep;
502 struct g_consumer *cp, *tmpcp;
507 if (sc->sc_provider != NULL)
508 g_mirror_destroy_provider(sc);
509 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL;
510 disk = LIST_FIRST(&sc->sc_disks)) {
511 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
512 g_mirror_update_metadata(disk);
513 g_mirror_destroy_disk(disk);
515 while ((ep = g_mirror_event_get(sc)) != NULL) {
516 g_mirror_event_remove(sc, ep);
517 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
518 g_mirror_event_free(ep);
520 ep->e_error = ECANCELED;
521 ep->e_flags |= G_MIRROR_EVENT_DONE;
522 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep);
523 mtx_lock(&sc->sc_events_mtx);
525 mtx_unlock(&sc->sc_events_mtx);
528 callout_drain(&sc->sc_callout);
531 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) {
532 g_mirror_disconnect_consumer(sc, cp);
534 sc->sc_sync.ds_geom->softc = NULL;
535 g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
536 mtx_destroy(&sc->sc_queue_mtx);
537 mtx_destroy(&sc->sc_events_mtx);
538 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name);
539 g_wither_geom(gp, ENXIO);
543 g_mirror_orphan(struct g_consumer *cp)
545 struct g_mirror_disk *disk;
552 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
553 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
554 G_MIRROR_EVENT_DONTWAIT);
558 * Function should return the next active disk on the list.
559 * It is possible that it will be the same disk as given.
560 * If there are no active disks on list, NULL is returned.
562 static __inline struct g_mirror_disk *
563 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
565 struct g_mirror_disk *dp;
567 for (dp = LIST_NEXT(disk, d_next); dp != disk;
568 dp = LIST_NEXT(dp, d_next)) {
570 dp = LIST_FIRST(&sc->sc_disks);
571 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE)
574 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
579 static struct g_mirror_disk *
580 g_mirror_get_disk(struct g_mirror_softc *sc)
582 struct g_mirror_disk *disk;
584 if (sc->sc_hint == NULL) {
585 sc->sc_hint = LIST_FIRST(&sc->sc_disks);
586 if (sc->sc_hint == NULL)
590 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) {
591 disk = g_mirror_find_next(sc, disk);
595 sc->sc_hint = g_mirror_find_next(sc, disk);
600 g_mirror_write_metadata(struct g_mirror_disk *disk,
601 struct g_mirror_metadata *md)
603 struct g_mirror_softc *sc;
604 struct g_consumer *cp;
605 off_t offset, length;
612 cp = disk->d_consumer;
613 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
614 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
615 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
616 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
618 length = cp->provider->sectorsize;
619 offset = cp->provider->mediasize - length;
620 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO);
622 mirror_metadata_encode(md, sector);
624 error = g_write_data(cp, offset, sector, length);
626 free(sector, M_MIRROR);
628 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_GENID;
629 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
630 G_MIRROR_EVENT_DONTWAIT);
636 g_mirror_clear_metadata(struct g_mirror_disk *disk)
641 error = g_mirror_write_metadata(disk, NULL);
643 G_MIRROR_DEBUG(2, "Metadata on %s cleared.",
644 g_mirror_get_diskname(disk));
647 "Cannot clear metadata on disk %s (error=%d).",
648 g_mirror_get_diskname(disk), error);
654 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk,
655 struct g_mirror_metadata *md)
658 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic));
659 md->md_version = G_MIRROR_VERSION;
660 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
661 md->md_mid = sc->sc_id;
662 md->md_all = sc->sc_ndisks;
663 md->md_slice = sc->sc_slice;
664 md->md_balance = sc->sc_balance;
665 md->md_genid = sc->sc_genid;
666 md->md_mediasize = sc->sc_mediasize;
667 md->md_sectorsize = sc->sc_sectorsize;
668 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK);
669 bzero(md->md_provider, sizeof(md->md_provider));
671 md->md_did = arc4random();
675 md->md_sync_offset = 0;
678 md->md_did = disk->d_id;
679 md->md_priority = disk->d_priority;
680 md->md_syncid = disk->d_sync.ds_syncid;
681 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK);
682 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
683 md->md_sync_offset = disk->d_sync.ds_offset_done;
685 md->md_sync_offset = 0;
686 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) {
687 strlcpy(md->md_provider,
688 disk->d_consumer->provider->name,
689 sizeof(md->md_provider));
691 md->md_provsize = disk->d_consumer->provider->mediasize;
696 g_mirror_update_metadata(struct g_mirror_disk *disk)
698 struct g_mirror_metadata md;
702 g_mirror_fill_metadata(disk->d_softc, disk, &md);
703 error = g_mirror_write_metadata(disk, &md);
705 G_MIRROR_DEBUG(2, "Metadata on %s updated.",
706 g_mirror_get_diskname(disk));
709 "Cannot update metadata on disk %s (error=%d).",
710 g_mirror_get_diskname(disk), error);
715 g_mirror_bump_syncid(struct g_mirror_softc *sc)
717 struct g_mirror_disk *disk;
720 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
721 ("%s called with no active disks (device=%s).", __func__,
725 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
727 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
728 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
729 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
730 disk->d_sync.ds_syncid = sc->sc_syncid;
731 g_mirror_update_metadata(disk);
737 g_mirror_bump_genid(struct g_mirror_softc *sc)
739 struct g_mirror_disk *disk;
742 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
743 ("%s called with no active disks (device=%s).", __func__,
747 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
749 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
750 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
751 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
752 disk->d_genid = sc->sc_genid;
753 g_mirror_update_metadata(disk);
759 g_mirror_idle(struct g_mirror_softc *sc)
761 struct g_mirror_disk *disk;
763 if (sc->sc_provider == NULL || sc->sc_provider->acw == 0)
767 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
768 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
770 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.",
771 g_mirror_get_diskname(disk), sc->sc_name);
772 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
773 g_mirror_update_metadata(disk);
779 g_mirror_unidle(struct g_mirror_softc *sc)
781 struct g_mirror_disk *disk;
785 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
786 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
788 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.",
789 g_mirror_get_diskname(disk), sc->sc_name);
790 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
791 g_mirror_update_metadata(disk);
797 * Return 1 if we should check if mirror is idling.
800 g_mirror_check_idle(struct g_mirror_softc *sc)
802 struct g_mirror_disk *disk;
806 if (sc->sc_provider != NULL && sc->sc_provider->acw == 0)
809 * Check if there are no in-flight requests.
811 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
812 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
814 if (disk->d_consumer->index > 0)
821 bintime_cmp(struct bintime *bt1, struct bintime *bt2)
824 if (bt1->sec < bt2->sec)
826 else if (bt1->sec > bt2->sec)
828 if (bt1->frac < bt2->frac)
830 else if (bt1->frac > bt2->frac)
836 g_mirror_update_delay(struct g_mirror_disk *disk, struct bio *bp)
839 if (disk->d_softc->sc_balance != G_MIRROR_BALANCE_LOAD)
841 binuptime(&disk->d_delay);
842 bintime_sub(&disk->d_delay, &bp->bio_t0);
846 g_mirror_done(struct bio *bp)
848 struct g_mirror_softc *sc;
850 sc = bp->bio_from->geom->softc;
851 bp->bio_cflags |= G_MIRROR_BIO_FLAG_REGULAR;
852 mtx_lock(&sc->sc_queue_mtx);
853 bioq_disksort(&sc->sc_queue, bp);
855 mtx_unlock(&sc->sc_queue_mtx);
859 g_mirror_regular_request(struct bio *bp)
861 struct g_mirror_softc *sc;
862 struct g_mirror_disk *disk;
865 g_topology_assert_not();
867 bp->bio_from->index--;
868 pbp = bp->bio_parent;
869 sc = pbp->bio_to->geom->softc;
870 disk = bp->bio_from->private;
873 g_mirror_kill_consumer(sc, bp->bio_from);
876 g_mirror_update_delay(disk, bp);
880 KASSERT(pbp->bio_inbed <= pbp->bio_children,
881 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
883 if (bp->bio_error == 0 && pbp->bio_error == 0) {
884 G_MIRROR_LOGREQ(3, bp, "Request delivered.");
886 if (pbp->bio_children == pbp->bio_inbed) {
887 G_MIRROR_LOGREQ(3, pbp, "Request delivered.");
888 pbp->bio_completed = pbp->bio_length;
889 g_io_deliver(pbp, pbp->bio_error);
892 } else if (bp->bio_error != 0) {
893 if (pbp->bio_error == 0)
894 pbp->bio_error = bp->bio_error;
895 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).",
898 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
899 g_mirror_event_send(disk,
900 G_MIRROR_DISK_STATE_DISCONNECTED,
901 G_MIRROR_EVENT_DONTWAIT);
903 switch (pbp->bio_cmd) {
913 switch (pbp->bio_cmd) {
915 if (pbp->bio_children == pbp->bio_inbed) {
917 mtx_lock(&sc->sc_queue_mtx);
918 bioq_disksort(&sc->sc_queue, pbp);
919 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
921 mtx_unlock(&sc->sc_queue_mtx);
926 if (pbp->bio_children == 0) {
928 * All requests failed.
930 } else if (pbp->bio_inbed < pbp->bio_children) {
933 } else if (pbp->bio_children == pbp->bio_inbed) {
934 /* Some requests succeeded. */
936 pbp->bio_completed = pbp->bio_length;
938 g_io_deliver(pbp, pbp->bio_error);
941 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd));
947 g_mirror_sync_done(struct bio *bp)
949 struct g_mirror_softc *sc;
951 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered.");
952 sc = bp->bio_from->geom->softc;
953 bp->bio_cflags |= G_MIRROR_BIO_FLAG_SYNC;
954 mtx_lock(&sc->sc_queue_mtx);
955 bioq_disksort(&sc->sc_queue, bp);
957 mtx_unlock(&sc->sc_queue_mtx);
961 g_mirror_start(struct bio *bp)
963 struct g_mirror_softc *sc;
965 sc = bp->bio_to->geom->softc;
967 * If sc == NULL or there are no valid disks, provider's error
968 * should be set and g_mirror_start() should not be called at all.
970 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
971 ("Provider's error should be set (error=%d)(mirror=%s).",
972 bp->bio_to->error, bp->bio_to->name));
973 G_MIRROR_LOGREQ(3, bp, "Request received.");
975 switch (bp->bio_cmd) {
982 g_io_deliver(bp, EOPNOTSUPP);
985 mtx_lock(&sc->sc_queue_mtx);
986 bioq_disksort(&sc->sc_queue, bp);
987 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
989 mtx_unlock(&sc->sc_queue_mtx);
993 * Send one synchronization request.
996 g_mirror_sync_one(struct g_mirror_disk *disk)
998 struct g_mirror_softc *sc;
1002 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
1003 ("Disk %s is not marked for synchronization.",
1004 g_mirror_get_diskname(disk)));
1009 bp->bio_parent = NULL;
1010 bp->bio_cmd = BIO_READ;
1011 bp->bio_offset = disk->d_sync.ds_offset;
1012 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
1014 bp->bio_done = g_mirror_sync_done;
1015 bp->bio_data = disk->d_sync.ds_data;
1016 if (bp->bio_data == NULL) {
1020 disk->d_sync.ds_offset += bp->bio_length;
1021 bp->bio_to = sc->sc_provider;
1022 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
1023 disk->d_sync.ds_consumer->index++;
1024 g_io_request(bp, disk->d_sync.ds_consumer);
1028 g_mirror_sync_request(struct bio *bp)
1030 struct g_mirror_softc *sc;
1031 struct g_mirror_disk *disk;
1033 bp->bio_from->index--;
1034 sc = bp->bio_from->geom->softc;
1035 disk = bp->bio_from->private;
1038 g_mirror_kill_consumer(sc, bp->bio_from);
1039 g_topology_unlock();
1045 * Synchronization request.
1047 switch (bp->bio_cmd) {
1050 struct g_consumer *cp;
1052 if (bp->bio_error != 0) {
1053 G_MIRROR_LOGREQ(0, bp,
1054 "Synchronization request failed (error=%d).",
1059 G_MIRROR_LOGREQ(3, bp,
1060 "Synchronization request half-finished.");
1061 bp->bio_cmd = BIO_WRITE;
1063 cp = disk->d_consumer;
1064 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
1065 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1066 cp->acr, cp->acw, cp->ace));
1068 g_io_request(bp, cp);
1073 struct g_mirror_disk_sync *sync;
1075 if (bp->bio_error != 0) {
1076 G_MIRROR_LOGREQ(0, bp,
1077 "Synchronization request failed (error=%d).",
1080 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
1081 g_mirror_event_send(disk,
1082 G_MIRROR_DISK_STATE_DISCONNECTED,
1083 G_MIRROR_EVENT_DONTWAIT);
1086 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished.");
1087 sync = &disk->d_sync;
1088 sync->ds_offset_done = bp->bio_offset + bp->bio_length;
1090 if (sync->ds_resync != -1)
1092 if (sync->ds_offset_done == sc->sc_provider->mediasize) {
1094 * Disk up-to-date, activate it.
1096 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE,
1097 G_MIRROR_EVENT_DONTWAIT);
1099 } else if (sync->ds_offset_done % (MAXPHYS * 100) == 0) {
1101 * Update offset_done on every 100 blocks.
1102 * XXX: This should be configurable.
1105 g_mirror_update_metadata(disk);
1106 g_topology_unlock();
1111 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1112 bp->bio_cmd, sc->sc_name));
1118 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp)
1120 struct g_mirror_disk *disk;
1121 struct g_consumer *cp;
1124 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1125 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE)
1129 if (bp->bio_error == 0)
1130 bp->bio_error = ENXIO;
1131 g_io_deliver(bp, bp->bio_error);
1134 cbp = g_clone_bio(bp);
1136 if (bp->bio_error == 0)
1137 bp->bio_error = ENOMEM;
1138 g_io_deliver(bp, bp->bio_error);
1142 * Fill in the component buf structure.
1144 cp = disk->d_consumer;
1145 cbp->bio_done = g_mirror_done;
1146 cbp->bio_to = cp->provider;
1147 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1148 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
1149 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1152 g_io_request(cbp, cp);
1156 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp)
1158 struct g_mirror_disk *disk;
1159 struct g_consumer *cp;
1162 disk = g_mirror_get_disk(sc);
1164 if (bp->bio_error == 0)
1165 bp->bio_error = ENXIO;
1166 g_io_deliver(bp, bp->bio_error);
1169 cbp = g_clone_bio(bp);
1171 if (bp->bio_error == 0)
1172 bp->bio_error = ENOMEM;
1173 g_io_deliver(bp, bp->bio_error);
1177 * Fill in the component buf structure.
1179 cp = disk->d_consumer;
1180 cbp->bio_done = g_mirror_done;
1181 cbp->bio_to = cp->provider;
1182 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1183 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
1184 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1187 g_io_request(cbp, cp);
1191 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp)
1193 struct g_mirror_disk *disk, *dp;
1194 struct g_consumer *cp;
1196 struct bintime curtime;
1198 binuptime(&curtime);
1200 * Find a disk which the smallest load.
1203 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1204 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1206 /* If disk wasn't used for more than 2 sec, use it. */
1207 if (curtime.sec - dp->d_last_used.sec >= 2) {
1212 bintime_cmp(&dp->d_delay, &disk->d_delay) < 0) {
1216 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name));
1217 cbp = g_clone_bio(bp);
1219 if (bp->bio_error == 0)
1220 bp->bio_error = ENOMEM;
1221 g_io_deliver(bp, bp->bio_error);
1225 * Fill in the component buf structure.
1227 cp = disk->d_consumer;
1228 cbp->bio_done = g_mirror_done;
1229 cbp->bio_to = cp->provider;
1230 binuptime(&disk->d_last_used);
1231 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1232 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
1233 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1236 g_io_request(cbp, cp);
1240 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp)
1242 struct bio_queue_head queue;
1243 struct g_mirror_disk *disk;
1244 struct g_consumer *cp;
1246 off_t left, mod, offset, slice;
1250 if (bp->bio_length <= sc->sc_slice) {
1251 g_mirror_request_round_robin(sc, bp);
1254 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE);
1255 slice = bp->bio_length / ndisks;
1256 mod = slice % sc->sc_provider->sectorsize;
1258 slice += sc->sc_provider->sectorsize - mod;
1260 * Allocate all bios before sending any request, so we can
1261 * return ENOMEM in nice and clean way.
1263 left = bp->bio_length;
1264 offset = bp->bio_offset;
1265 data = bp->bio_data;
1267 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1268 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1270 cbp = g_clone_bio(bp);
1272 for (cbp = bioq_first(&queue); cbp != NULL;
1273 cbp = bioq_first(&queue)) {
1274 bioq_remove(&queue, cbp);
1277 if (bp->bio_error == 0)
1278 bp->bio_error = ENOMEM;
1279 g_io_deliver(bp, bp->bio_error);
1282 bioq_insert_tail(&queue, cbp);
1283 cbp->bio_done = g_mirror_done;
1284 cbp->bio_caller1 = disk;
1285 cbp->bio_to = disk->d_consumer->provider;
1286 cbp->bio_offset = offset;
1287 cbp->bio_data = data;
1288 cbp->bio_length = MIN(left, slice);
1289 left -= cbp->bio_length;
1292 offset += cbp->bio_length;
1293 data += cbp->bio_length;
1295 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
1296 bioq_remove(&queue, cbp);
1297 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1298 disk = cbp->bio_caller1;
1299 cbp->bio_caller1 = NULL;
1300 cp = disk->d_consumer;
1301 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
1302 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1303 cp->acr, cp->acw, cp->ace));
1304 disk->d_consumer->index++;
1305 g_io_request(cbp, disk->d_consumer);
1310 g_mirror_register_request(struct bio *bp)
1312 struct g_mirror_softc *sc;
1314 sc = bp->bio_to->geom->softc;
1315 switch (bp->bio_cmd) {
1317 switch (sc->sc_balance) {
1318 case G_MIRROR_BALANCE_LOAD:
1319 g_mirror_request_load(sc, bp);
1321 case G_MIRROR_BALANCE_PREFER:
1322 g_mirror_request_prefer(sc, bp);
1324 case G_MIRROR_BALANCE_ROUND_ROBIN:
1325 g_mirror_request_round_robin(sc, bp);
1327 case G_MIRROR_BALANCE_SPLIT:
1328 g_mirror_request_split(sc, bp);
1335 struct g_mirror_disk *disk;
1336 struct g_mirror_disk_sync *sync;
1337 struct bio_queue_head queue;
1338 struct g_consumer *cp;
1342 g_mirror_unidle(sc);
1344 * Allocate all bios before sending any request, so we can
1345 * return ENOMEM in nice and clean way.
1348 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1349 sync = &disk->d_sync;
1350 switch (disk->d_state) {
1351 case G_MIRROR_DISK_STATE_ACTIVE:
1353 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
1354 if (bp->bio_offset >= sync->ds_offset)
1356 else if (bp->bio_offset + bp->bio_length >
1357 sync->ds_offset_done &&
1358 (bp->bio_offset < sync->ds_resync ||
1359 sync->ds_resync == -1)) {
1360 sync->ds_resync = bp->bio_offset -
1361 (bp->bio_offset % MAXPHYS);
1367 cbp = g_clone_bio(bp);
1369 for (cbp = bioq_first(&queue); cbp != NULL;
1370 cbp = bioq_first(&queue)) {
1371 bioq_remove(&queue, cbp);
1374 if (bp->bio_error == 0)
1375 bp->bio_error = ENOMEM;
1376 g_io_deliver(bp, bp->bio_error);
1379 bioq_insert_tail(&queue, cbp);
1380 cbp->bio_done = g_mirror_done;
1381 cp = disk->d_consumer;
1382 cbp->bio_caller1 = cp;
1383 cbp->bio_to = cp->provider;
1384 KASSERT(cp->acr == 1 && cp->acw == 1 && cp->ace == 1,
1385 ("Consumer %s not opened (r%dw%de%d).",
1386 cp->provider->name, cp->acr, cp->acw, cp->ace));
1388 for (cbp = bioq_first(&queue); cbp != NULL;
1389 cbp = bioq_first(&queue)) {
1390 bioq_remove(&queue, cbp);
1391 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1392 cp = cbp->bio_caller1;
1393 cbp->bio_caller1 = NULL;
1395 g_io_request(cbp, cp);
1398 * Bump syncid on first write.
1400 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) {
1401 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
1403 g_mirror_bump_syncid(sc);
1404 g_topology_unlock();
1409 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1410 bp->bio_cmd, sc->sc_name));
1416 g_mirror_can_destroy(struct g_mirror_softc *sc)
1419 struct g_consumer *cp;
1421 g_topology_assert();
1423 LIST_FOREACH(cp, &gp->consumer, consumer) {
1424 if (g_mirror_is_busy(sc, cp))
1427 gp = sc->sc_sync.ds_geom;
1428 LIST_FOREACH(cp, &gp->consumer, consumer) {
1429 if (g_mirror_is_busy(sc, cp))
1432 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
1438 g_mirror_try_destroy(struct g_mirror_softc *sc)
1441 if (sc->sc_rootmount != NULL) {
1442 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
1444 root_mount_rel(sc->sc_rootmount);
1445 sc->sc_rootmount = NULL;
1448 if (!g_mirror_can_destroy(sc)) {
1449 g_topology_unlock();
1452 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) {
1453 g_topology_unlock();
1454 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1456 wakeup(&sc->sc_worker);
1457 sc->sc_worker = NULL;
1459 g_mirror_destroy_device(sc);
1460 g_topology_unlock();
1470 g_mirror_worker(void *arg)
1472 struct g_mirror_softc *sc;
1473 struct g_mirror_disk *disk;
1474 struct g_mirror_disk_sync *sync;
1475 struct g_mirror_event *ep;
1480 mtx_lock_spin(&sched_lock);
1481 sched_prio(curthread, PRIBIO);
1482 mtx_unlock_spin(&sched_lock);
1486 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__);
1488 * First take a look at events.
1489 * This is important to handle events before any I/O requests.
1491 ep = g_mirror_event_get(sc);
1492 if (ep != NULL && g_topology_try_lock()) {
1493 g_mirror_event_remove(sc, ep);
1494 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) {
1495 /* Update only device status. */
1497 "Running event for device %s.",
1500 g_mirror_update_device(sc, 1);
1502 /* Update disk status. */
1503 G_MIRROR_DEBUG(3, "Running event for disk %s.",
1504 g_mirror_get_diskname(ep->e_disk));
1505 ep->e_error = g_mirror_update_disk(ep->e_disk,
1507 if (ep->e_error == 0)
1508 g_mirror_update_device(sc, 0);
1510 g_topology_unlock();
1511 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) {
1512 KASSERT(ep->e_error == 0,
1513 ("Error cannot be handled."));
1514 g_mirror_event_free(ep);
1516 ep->e_flags |= G_MIRROR_EVENT_DONE;
1517 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1519 mtx_lock(&sc->sc_events_mtx);
1521 mtx_unlock(&sc->sc_events_mtx);
1524 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1525 if (g_mirror_try_destroy(sc))
1528 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__);
1534 /* Get first request from the queue. */
1535 mtx_lock(&sc->sc_queue_mtx);
1536 bp = bioq_first(&sc->sc_queue);
1540 * No I/O requests and topology lock was
1541 * already held? Try again.
1543 mtx_unlock(&sc->sc_queue_mtx);
1547 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1548 mtx_unlock(&sc->sc_queue_mtx);
1549 if (g_mirror_try_destroy(sc))
1551 mtx_lock(&sc->sc_queue_mtx);
1554 if (sc->sc_sync.ds_ndisks > 0 &&
1555 (bp == NULL || nreqs > g_mirror_reqs_per_sync)) {
1556 mtx_unlock(&sc->sc_queue_mtx);
1558 * It is time for synchronization...
1561 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1562 if (disk->d_state !=
1563 G_MIRROR_DISK_STATE_SYNCHRONIZING) {
1566 sync = &disk->d_sync;
1567 if (sync->ds_offset >=
1568 sc->sc_provider->mediasize) {
1571 if (sync->ds_offset > sync->ds_offset_done)
1573 if (sync->ds_resync != -1) {
1574 sync->ds_offset = sync->ds_resync;
1575 sync->ds_offset_done = sync->ds_resync;
1576 sync->ds_resync = -1;
1578 g_mirror_sync_one(disk);
1580 G_MIRROR_DEBUG(5, "%s: I'm here 2.", __func__);
1584 if (g_mirror_check_idle(sc)) {
1587 idletime = g_mirror_idletime;
1591 if (msleep(sc, &sc->sc_queue_mtx, PRIBIO | PDROP,
1592 "m:w1", idletime) == EWOULDBLOCK) {
1593 G_MIRROR_DEBUG(5, "%s: I'm here 3.",
1596 * No I/O requests in 'idletime' seconds,
1597 * so mark components as clean.
1601 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__);
1603 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP,
1605 G_MIRROR_DEBUG(5, "%s: I'm here 5.", __func__);
1610 bioq_remove(&sc->sc_queue, bp);
1611 mtx_unlock(&sc->sc_queue_mtx);
1613 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) {
1614 g_mirror_regular_request(bp);
1615 } else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) {
1618 g_mirror_sync_request(bp);
1620 sps = g_mirror_syncs_per_sec;
1622 G_MIRROR_DEBUG(5, "%s: I'm here 6.", __func__);
1627 * We have some pending events, don't sleep now.
1629 G_MIRROR_DEBUG(5, "%s: I'm here 7.", __func__);
1632 mtx_lock(&sc->sc_queue_mtx);
1633 if (bioq_first(&sc->sc_queue) != NULL) {
1634 mtx_unlock(&sc->sc_queue_mtx);
1635 G_MIRROR_DEBUG(5, "%s: I'm here 8.", __func__);
1641 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w3",
1644 g_mirror_register_request(bp);
1646 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__);
1651 * Open disk's consumer if needed.
1654 g_mirror_update_access(struct g_mirror_disk *disk)
1656 struct g_provider *pp;
1658 g_topology_assert();
1660 pp = disk->d_softc->sc_provider;
1664 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) {
1666 "Disk %s (device %s) marked as dirty.",
1667 g_mirror_get_diskname(disk),
1668 disk->d_softc->sc_name);
1669 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
1671 } else if (pp->acw == 0) {
1672 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
1674 "Disk %s (device %s) marked as clean.",
1675 g_mirror_get_diskname(disk),
1676 disk->d_softc->sc_name);
1677 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
1683 g_mirror_sync_start(struct g_mirror_disk *disk)
1685 struct g_mirror_softc *sc;
1688 g_topology_assert();
1691 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
1692 ("Device not in RUNNING state (%s, %u).", sc->sc_name,
1695 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
1696 g_mirror_get_diskname(disk));
1697 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
1698 KASSERT(disk->d_sync.ds_consumer == NULL,
1699 ("Sync consumer already exists (device=%s, disk=%s).",
1700 sc->sc_name, g_mirror_get_diskname(disk)));
1701 disk->d_sync.ds_consumer = g_new_consumer(sc->sc_sync.ds_geom);
1702 disk->d_sync.ds_consumer->private = disk;
1703 disk->d_sync.ds_consumer->index = 0;
1704 error = g_attach(disk->d_sync.ds_consumer, disk->d_softc->sc_provider);
1705 KASSERT(error == 0, ("Cannot attach to %s (error=%d).",
1706 disk->d_softc->sc_name, error));
1707 error = g_access(disk->d_sync.ds_consumer, 1, 0, 0);
1708 KASSERT(error == 0, ("Cannot open %s (error=%d).",
1709 disk->d_softc->sc_name, error));
1710 disk->d_sync.ds_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK);
1711 sc->sc_sync.ds_ndisks++;
1715 * Stop synchronization process.
1716 * type: 0 - synchronization finished
1717 * 1 - synchronization stopped
1720 g_mirror_sync_stop(struct g_mirror_disk *disk, int type)
1723 g_topology_assert();
1724 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
1725 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
1726 g_mirror_disk_state2str(disk->d_state)));
1727 if (disk->d_sync.ds_consumer == NULL)
1731 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.",
1732 disk->d_softc->sc_name, g_mirror_get_diskname(disk));
1733 } else /* if (type == 1) */ {
1734 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
1735 disk->d_softc->sc_name, g_mirror_get_diskname(disk));
1737 g_mirror_kill_consumer(disk->d_softc, disk->d_sync.ds_consumer);
1738 free(disk->d_sync.ds_data, M_MIRROR);
1739 disk->d_sync.ds_consumer = NULL;
1740 disk->d_softc->sc_sync.ds_ndisks--;
1741 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
1745 g_mirror_launch_provider(struct g_mirror_softc *sc)
1747 struct g_mirror_disk *disk;
1748 struct g_provider *pp;
1750 g_topology_assert();
1752 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name);
1753 pp->mediasize = sc->sc_mediasize;
1754 pp->sectorsize = sc->sc_sectorsize;
1755 sc->sc_provider = pp;
1756 g_error_provider(pp, 0);
1757 G_MIRROR_DEBUG(0, "Device %s: provider %s launched.", sc->sc_name,
1759 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1760 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
1761 g_mirror_sync_start(disk);
1766 g_mirror_destroy_provider(struct g_mirror_softc *sc)
1768 struct g_mirror_disk *disk;
1771 g_topology_assert();
1772 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
1775 g_error_provider(sc->sc_provider, ENXIO);
1776 mtx_lock(&sc->sc_queue_mtx);
1777 while ((bp = bioq_first(&sc->sc_queue)) != NULL) {
1778 bioq_remove(&sc->sc_queue, bp);
1779 g_io_deliver(bp, ENXIO);
1781 mtx_unlock(&sc->sc_queue_mtx);
1782 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name,
1783 sc->sc_provider->name);
1784 sc->sc_provider->flags |= G_PF_WITHER;
1785 g_orphan_provider(sc->sc_provider, ENXIO);
1786 sc->sc_provider = NULL;
1787 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1788 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
1789 g_mirror_sync_stop(disk, 1);
1794 g_mirror_go(void *arg)
1796 struct g_mirror_softc *sc;
1799 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
1800 g_mirror_event_send(sc, 0,
1801 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE);
1805 g_mirror_determine_state(struct g_mirror_disk *disk)
1807 struct g_mirror_softc *sc;
1811 if (sc->sc_syncid == disk->d_sync.ds_syncid) {
1812 if ((disk->d_flags &
1813 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
1814 /* Disk does not need synchronization. */
1815 state = G_MIRROR_DISK_STATE_ACTIVE;
1818 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
1820 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
1822 * We can start synchronization from
1823 * the stored offset.
1825 state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
1827 state = G_MIRROR_DISK_STATE_STALE;
1830 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
1832 * Reset all synchronization data for this disk,
1833 * because if it even was synchronized, it was
1834 * synchronized to disks with different syncid.
1836 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING;
1837 disk->d_sync.ds_offset = 0;
1838 disk->d_sync.ds_offset_done = 0;
1839 disk->d_sync.ds_syncid = sc->sc_syncid;
1840 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
1841 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
1842 state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
1844 state = G_MIRROR_DISK_STATE_STALE;
1846 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
1848 * Not good, NOT GOOD!
1849 * It means that mirror was started on stale disks
1850 * and more fresh disk just arrive.
1851 * If there were writes, mirror is fucked up, sorry.
1852 * I think the best choice here is don't touch
1853 * this disk and inform the user laudly.
1855 G_MIRROR_DEBUG(0, "Device %s was started before the freshest "
1856 "disk (%s) arrives!! It will not be connected to the "
1857 "running device.", sc->sc_name,
1858 g_mirror_get_diskname(disk));
1859 g_mirror_destroy_disk(disk);
1860 state = G_MIRROR_DISK_STATE_NONE;
1861 /* Return immediately, because disk was destroyed. */
1864 G_MIRROR_DEBUG(3, "State for %s disk: %s.",
1865 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state));
1870 * Update device state.
1873 g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force)
1875 struct g_mirror_disk *disk;
1878 g_topology_assert();
1880 switch (sc->sc_state) {
1881 case G_MIRROR_DEVICE_STATE_STARTING:
1883 struct g_mirror_disk *pdisk, *tdisk;
1884 u_int dirty, ndisks, genid, syncid;
1886 KASSERT(sc->sc_provider == NULL,
1887 ("Non-NULL provider in STARTING state (%s).", sc->sc_name));
1889 * Are we ready? We are, if all disks are connected or
1890 * if we have any disks and 'force' is true.
1892 if ((force && g_mirror_ndisks(sc, -1) > 0) ||
1893 sc->sc_ndisks == g_mirror_ndisks(sc, -1)) {
1895 } else if (g_mirror_ndisks(sc, -1) == 0) {
1897 * Disks went down in starting phase, so destroy
1900 callout_drain(&sc->sc_callout);
1901 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
1902 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
1904 root_mount_rel(sc->sc_rootmount);
1905 sc->sc_rootmount = NULL;
1912 * Activate all disks with the biggest syncid.
1916 * If 'force' is true, we have been called due to
1917 * timeout, so don't bother canceling timeout.
1920 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1921 if ((disk->d_flags &
1922 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
1927 /* No valid disks found, destroy device. */
1928 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
1929 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
1930 __LINE__, sc->sc_rootmount);
1931 root_mount_rel(sc->sc_rootmount);
1932 sc->sc_rootmount = NULL;
1936 /* Cancel timeout. */
1937 callout_drain(&sc->sc_callout);
1941 * Find the biggest genid.
1944 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1945 if (disk->d_genid > genid)
1946 genid = disk->d_genid;
1948 sc->sc_genid = genid;
1950 * Remove all disks without the biggest genid.
1952 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) {
1953 if (disk->d_genid < genid) {
1955 "Component %s (device %s) broken, skipping.",
1956 g_mirror_get_diskname(disk), sc->sc_name);
1957 g_mirror_destroy_disk(disk);
1962 * Find the biggest syncid.
1965 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1966 if (disk->d_sync.ds_syncid > syncid)
1967 syncid = disk->d_sync.ds_syncid;
1971 * Here we need to look for dirty disks and if all disks
1972 * with the biggest syncid are dirty, we have to choose
1973 * one with the biggest priority and rebuild the rest.
1976 * Find the number of dirty disks with the biggest syncid.
1977 * Find the number of disks with the biggest syncid.
1978 * While here, find a disk with the biggest priority.
1982 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1983 if (disk->d_sync.ds_syncid != syncid)
1985 if ((disk->d_flags &
1986 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
1990 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
1992 if (pdisk == NULL ||
1993 pdisk->d_priority < disk->d_priority) {
1999 /* No dirty disks at all, great. */
2000 } else if (dirty == ndisks) {
2002 * Force synchronization for all dirty disks except one
2003 * with the biggest priority.
2005 KASSERT(pdisk != NULL, ("pdisk == NULL"));
2006 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a "
2007 "master disk for synchronization.",
2008 g_mirror_get_diskname(pdisk), sc->sc_name);
2009 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2010 if (disk->d_sync.ds_syncid != syncid)
2012 if ((disk->d_flags &
2013 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2016 KASSERT((disk->d_flags &
2017 G_MIRROR_DISK_FLAG_DIRTY) != 0,
2018 ("Disk %s isn't marked as dirty.",
2019 g_mirror_get_diskname(disk)));
2020 /* Skip the disk with the biggest priority. */
2023 disk->d_sync.ds_syncid = 0;
2025 } else if (dirty < ndisks) {
2027 * Force synchronization for all dirty disks.
2028 * We have some non-dirty disks.
2030 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2031 if (disk->d_sync.ds_syncid != syncid)
2033 if ((disk->d_flags &
2034 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2037 if ((disk->d_flags &
2038 G_MIRROR_DISK_FLAG_DIRTY) == 0) {
2041 disk->d_sync.ds_syncid = 0;
2047 sc->sc_syncid = syncid;
2049 /* Remember to bump syncid on first write. */
2050 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2052 state = G_MIRROR_DEVICE_STATE_RUNNING;
2053 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.",
2054 sc->sc_name, g_mirror_device_state2str(sc->sc_state),
2055 g_mirror_device_state2str(state));
2056 sc->sc_state = state;
2057 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2058 state = g_mirror_determine_state(disk);
2059 g_mirror_event_send(disk, state,
2060 G_MIRROR_EVENT_DONTWAIT);
2061 if (state == G_MIRROR_DISK_STATE_STALE)
2062 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2066 case G_MIRROR_DEVICE_STATE_RUNNING:
2067 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 &&
2068 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2070 * No active disks or no disks at all,
2071 * so destroy device.
2073 if (sc->sc_provider != NULL)
2074 g_mirror_destroy_provider(sc);
2075 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2077 } else if (g_mirror_ndisks(sc,
2078 G_MIRROR_DISK_STATE_ACTIVE) > 0 &&
2079 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2081 * We have active disks, launch provider if it doesn't
2084 if (sc->sc_provider == NULL)
2085 g_mirror_launch_provider(sc);
2086 if (sc->sc_rootmount != NULL) {
2087 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2088 __LINE__, sc->sc_rootmount);
2089 root_mount_rel(sc->sc_rootmount);
2090 sc->sc_rootmount = NULL;
2094 * Genid should be bumped immediately, so do it here.
2096 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) {
2097 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID;
2098 g_mirror_bump_genid(sc);
2102 KASSERT(1 == 0, ("Wrong device state (%s, %s).",
2103 sc->sc_name, g_mirror_device_state2str(sc->sc_state)));
2109 * Update disk state and device state if needed.
2111 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \
2112 "Disk %s state changed from %s to %s (device %s).", \
2113 g_mirror_get_diskname(disk), \
2114 g_mirror_disk_state2str(disk->d_state), \
2115 g_mirror_disk_state2str(state), sc->sc_name)
2117 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state)
2119 struct g_mirror_softc *sc;
2121 g_topology_assert();
2125 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.",
2126 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state),
2127 g_mirror_disk_state2str(state));
2129 case G_MIRROR_DISK_STATE_NEW:
2131 * Possible scenarios:
2132 * 1. New disk arrive.
2134 /* Previous state should be NONE. */
2135 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE,
2136 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2137 g_mirror_disk_state2str(disk->d_state)));
2138 DISK_STATE_CHANGED();
2140 disk->d_state = state;
2141 if (LIST_EMPTY(&sc->sc_disks))
2142 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next);
2144 struct g_mirror_disk *dp;
2146 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
2147 if (disk->d_priority >= dp->d_priority) {
2148 LIST_INSERT_BEFORE(dp, disk, d_next);
2152 if (LIST_NEXT(dp, d_next) == NULL)
2156 LIST_INSERT_AFTER(dp, disk, d_next);
2158 G_MIRROR_DEBUG(0, "Device %s: provider %s detected.",
2159 sc->sc_name, g_mirror_get_diskname(disk));
2160 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
2162 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2163 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2164 g_mirror_device_state2str(sc->sc_state),
2165 g_mirror_get_diskname(disk),
2166 g_mirror_disk_state2str(disk->d_state)));
2167 state = g_mirror_determine_state(disk);
2168 if (state != G_MIRROR_DISK_STATE_NONE)
2171 case G_MIRROR_DISK_STATE_ACTIVE:
2173 * Possible scenarios:
2174 * 1. New disk does not need synchronization.
2175 * 2. Synchronization process finished successfully.
2177 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2178 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2179 g_mirror_device_state2str(sc->sc_state),
2180 g_mirror_get_diskname(disk),
2181 g_mirror_disk_state2str(disk->d_state)));
2182 /* Previous state should be NEW or SYNCHRONIZING. */
2183 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW ||
2184 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2185 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2186 g_mirror_disk_state2str(disk->d_state)));
2187 DISK_STATE_CHANGED();
2189 if (disk->d_state == G_MIRROR_DISK_STATE_NEW)
2190 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2191 else if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
2192 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2193 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC;
2194 g_mirror_sync_stop(disk, 0);
2196 disk->d_state = state;
2197 disk->d_sync.ds_offset = 0;
2198 disk->d_sync.ds_offset_done = 0;
2199 g_mirror_update_access(disk);
2200 g_mirror_update_metadata(disk);
2201 G_MIRROR_DEBUG(0, "Device %s: provider %s activated.",
2202 sc->sc_name, g_mirror_get_diskname(disk));
2204 case G_MIRROR_DISK_STATE_STALE:
2206 * Possible scenarios:
2207 * 1. Stale disk was connected.
2209 /* Previous state should be NEW. */
2210 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2211 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2212 g_mirror_disk_state2str(disk->d_state)));
2213 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2214 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2215 g_mirror_device_state2str(sc->sc_state),
2216 g_mirror_get_diskname(disk),
2217 g_mirror_disk_state2str(disk->d_state)));
2219 * STALE state is only possible if device is marked
2222 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0,
2223 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2224 g_mirror_device_state2str(sc->sc_state),
2225 g_mirror_get_diskname(disk),
2226 g_mirror_disk_state2str(disk->d_state)));
2227 DISK_STATE_CHANGED();
2229 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2230 disk->d_state = state;
2231 g_mirror_update_metadata(disk);
2232 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.",
2233 sc->sc_name, g_mirror_get_diskname(disk));
2235 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
2237 * Possible scenarios:
2238 * 1. Disk which needs synchronization was connected.
2240 /* Previous state should be NEW. */
2241 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2242 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2243 g_mirror_disk_state2str(disk->d_state)));
2244 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2245 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2246 g_mirror_device_state2str(sc->sc_state),
2247 g_mirror_get_diskname(disk),
2248 g_mirror_disk_state2str(disk->d_state)));
2249 DISK_STATE_CHANGED();
2251 if (disk->d_state == G_MIRROR_DISK_STATE_NEW)
2252 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2253 disk->d_state = state;
2254 if (sc->sc_provider != NULL) {
2255 g_mirror_sync_start(disk);
2256 g_mirror_update_metadata(disk);
2259 case G_MIRROR_DISK_STATE_DISCONNECTED:
2261 * Possible scenarios:
2262 * 1. Device wasn't running yet, but disk disappear.
2263 * 2. Disk was active and disapppear.
2264 * 3. Disk disappear during synchronization process.
2266 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) {
2268 * Previous state should be ACTIVE, STALE or
2271 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
2272 disk->d_state == G_MIRROR_DISK_STATE_STALE ||
2273 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2274 ("Wrong disk state (%s, %s).",
2275 g_mirror_get_diskname(disk),
2276 g_mirror_disk_state2str(disk->d_state)));
2277 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) {
2278 /* Previous state should be NEW. */
2279 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2280 ("Wrong disk state (%s, %s).",
2281 g_mirror_get_diskname(disk),
2282 g_mirror_disk_state2str(disk->d_state)));
2284 * Reset bumping syncid if disk disappeared in STARTING
2287 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0)
2288 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
2291 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
2293 g_mirror_device_state2str(sc->sc_state),
2294 g_mirror_get_diskname(disk),
2295 g_mirror_disk_state2str(disk->d_state)));
2298 DISK_STATE_CHANGED();
2299 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.",
2300 sc->sc_name, g_mirror_get_diskname(disk));
2302 g_mirror_destroy_disk(disk);
2304 case G_MIRROR_DISK_STATE_DESTROY:
2308 error = g_mirror_clear_metadata(disk);
2311 DISK_STATE_CHANGED();
2312 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.",
2313 sc->sc_name, g_mirror_get_diskname(disk));
2315 g_mirror_destroy_disk(disk);
2317 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2318 g_mirror_update_metadata(disk);
2323 KASSERT(1 == 0, ("Unknown state (%u).", state));
2328 #undef DISK_STATE_CHANGED
2331 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md)
2333 struct g_provider *pp;
2337 g_topology_assert();
2339 error = g_access(cp, 1, 0, 0);
2343 g_topology_unlock();
2344 /* Metadata are stored on last sector. */
2345 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
2348 g_access(cp, -1, 0, 0);
2350 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).",
2351 cp->provider->name, error);
2357 /* Decode metadata. */
2358 error = mirror_metadata_decode(buf, md);
2360 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0)
2362 if (md->md_version > G_MIRROR_VERSION) {
2364 "Kernel module is too old to handle metadata from %s.",
2365 cp->provider->name);
2369 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
2370 cp->provider->name);
2378 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp,
2379 struct g_mirror_metadata *md)
2382 if (g_mirror_id2disk(sc, md->md_did) != NULL) {
2383 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.",
2384 pp->name, md->md_did);
2387 if (md->md_all != sc->sc_ndisks) {
2389 "Invalid '%s' field on disk %s (device %s), skipping.",
2390 "md_all", pp->name, sc->sc_name);
2393 if (md->md_slice != sc->sc_slice) {
2395 "Invalid '%s' field on disk %s (device %s), skipping.",
2396 "md_slice", pp->name, sc->sc_name);
2399 if (md->md_balance != sc->sc_balance) {
2401 "Invalid '%s' field on disk %s (device %s), skipping.",
2402 "md_balance", pp->name, sc->sc_name);
2405 if (md->md_mediasize != sc->sc_mediasize) {
2407 "Invalid '%s' field on disk %s (device %s), skipping.",
2408 "md_mediasize", pp->name, sc->sc_name);
2411 if (sc->sc_mediasize > pp->mediasize) {
2413 "Invalid size of disk %s (device %s), skipping.", pp->name,
2417 if (md->md_sectorsize != sc->sc_sectorsize) {
2419 "Invalid '%s' field on disk %s (device %s), skipping.",
2420 "md_sectorsize", pp->name, sc->sc_name);
2423 if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
2425 "Invalid sector size of disk %s (device %s), skipping.",
2426 pp->name, sc->sc_name);
2429 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) {
2431 "Invalid device flags on disk %s (device %s), skipping.",
2432 pp->name, sc->sc_name);
2435 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) {
2437 "Invalid disk flags on disk %s (device %s), skipping.",
2438 pp->name, sc->sc_name);
2445 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
2446 struct g_mirror_metadata *md)
2448 struct g_mirror_disk *disk;
2451 g_topology_assert();
2452 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name);
2454 error = g_mirror_check_metadata(sc, pp, md);
2457 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING &&
2458 md->md_genid < sc->sc_genid) {
2459 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.",
2460 pp->name, sc->sc_name);
2463 disk = g_mirror_init_disk(sc, pp, md, &error);
2466 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW,
2467 G_MIRROR_EVENT_WAIT);
2470 if (md->md_version < G_MIRROR_VERSION) {
2471 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
2472 pp->name, md->md_version, G_MIRROR_VERSION);
2473 g_mirror_update_metadata(disk);
2479 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace)
2481 struct g_mirror_softc *sc;
2482 struct g_mirror_disk *disk;
2485 g_topology_assert();
2486 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
2489 dcr = pp->acr + acr;
2490 dcw = pp->acw + acw;
2491 dce = pp->ace + ace;
2493 sc = pp->geom->softc;
2494 if (sc == NULL || LIST_EMPTY(&sc->sc_disks) ||
2495 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
2496 if (acr <= 0 && acw <= 0 && ace <= 0)
2501 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2502 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
2505 * Mark disk as dirty on open and unmark on close.
2507 if (pp->acw == 0 && dcw > 0) {
2509 "Disk %s (device %s) marked as dirty.",
2510 g_mirror_get_diskname(disk), sc->sc_name);
2511 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
2512 g_mirror_update_metadata(disk);
2513 } else if (pp->acw > 0 && dcw == 0) {
2515 "Disk %s (device %s) marked as clean.",
2516 g_mirror_get_diskname(disk), sc->sc_name);
2517 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2518 g_mirror_update_metadata(disk);
2524 static struct g_geom *
2525 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md)
2527 struct g_mirror_softc *sc;
2531 g_topology_assert();
2532 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
2535 /* One disk is minimum. */
2541 gp = g_new_geomf(mp, "%s", md->md_name);
2542 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO);
2543 gp->start = g_mirror_start;
2544 gp->orphan = g_mirror_orphan;
2545 gp->access = g_mirror_access;
2546 gp->dumpconf = g_mirror_dumpconf;
2548 sc->sc_id = md->md_mid;
2549 sc->sc_slice = md->md_slice;
2550 sc->sc_balance = md->md_balance;
2551 sc->sc_mediasize = md->md_mediasize;
2552 sc->sc_sectorsize = md->md_sectorsize;
2553 sc->sc_ndisks = md->md_all;
2554 sc->sc_flags = md->md_mflags;
2557 bioq_init(&sc->sc_queue);
2558 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF);
2559 LIST_INIT(&sc->sc_disks);
2560 TAILQ_INIT(&sc->sc_events);
2561 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF);
2562 callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
2563 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING;
2566 sc->sc_provider = NULL;
2568 * Synchronization geom.
2570 gp = g_new_geomf(mp, "%s.sync", md->md_name);
2572 gp->orphan = g_mirror_orphan;
2573 sc->sc_sync.ds_geom = gp;
2574 sc->sc_sync.ds_ndisks = 0;
2575 error = kthread_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0,
2576 "g_mirror %s", md->md_name);
2578 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.",
2580 g_destroy_geom(sc->sc_sync.ds_geom);
2581 mtx_destroy(&sc->sc_events_mtx);
2582 mtx_destroy(&sc->sc_queue_mtx);
2583 g_destroy_geom(sc->sc_geom);
2588 G_MIRROR_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
2590 sc->sc_rootmount = root_mount_hold("GMIRROR");
2591 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
2595 timeout = g_mirror_timeout * hz;
2596 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc);
2597 return (sc->sc_geom);
2601 g_mirror_destroy(struct g_mirror_softc *sc, boolean_t force)
2603 struct g_provider *pp;
2605 g_topology_assert();
2609 pp = sc->sc_provider;
2610 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
2612 G_MIRROR_DEBUG(1, "Device %s is still open, so it "
2613 "can't be definitely removed.", pp->name);
2616 "Device %s is still open (r%dw%de%d).", pp->name,
2617 pp->acr, pp->acw, pp->ace);
2622 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2623 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT;
2624 g_topology_unlock();
2625 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
2626 mtx_lock(&sc->sc_queue_mtx);
2628 mtx_unlock(&sc->sc_queue_mtx);
2629 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
2630 while (sc->sc_worker != NULL)
2631 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5);
2632 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
2634 g_mirror_destroy_device(sc);
2640 g_mirror_taste_orphan(struct g_consumer *cp)
2643 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
2644 cp->provider->name));
2647 static struct g_geom *
2648 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
2650 struct g_mirror_metadata md;
2651 struct g_mirror_softc *sc;
2652 struct g_consumer *cp;
2656 g_topology_assert();
2657 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
2658 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name);
2660 gp = g_new_geomf(mp, "mirror:taste");
2662 * This orphan function should be never called.
2664 gp->orphan = g_mirror_taste_orphan;
2665 cp = g_new_consumer(gp);
2667 error = g_mirror_read_metadata(cp, &md);
2669 g_destroy_consumer(cp);
2675 if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0)
2677 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
2679 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) {
2681 "Device %s: provider %s marked as inactive, skipping.",
2682 md.md_name, pp->name);
2685 if (g_mirror_debug >= 2)
2686 mirror_metadata_dump(&md);
2689 * Let's check if device already exists.
2692 LIST_FOREACH(gp, &mp->geom, geom) {
2696 if (sc->sc_sync.ds_geom == gp)
2698 if (strcmp(md.md_name, sc->sc_name) != 0)
2700 if (md.md_mid != sc->sc_id) {
2701 G_MIRROR_DEBUG(0, "Device %s already configured.",
2708 gp = g_mirror_create(mp, &md);
2710 G_MIRROR_DEBUG(0, "Cannot create device %s.",
2716 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
2717 error = g_mirror_add_disk(sc, pp, &md);
2719 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
2720 pp->name, gp->name, error);
2721 if (LIST_EMPTY(&sc->sc_disks))
2722 g_mirror_destroy(sc, 1);
2729 g_mirror_destroy_geom(struct gctl_req *req __unused,
2730 struct g_class *mp __unused, struct g_geom *gp)
2733 return (g_mirror_destroy(gp->softc, 0));
2737 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
2738 struct g_consumer *cp, struct g_provider *pp)
2740 struct g_mirror_softc *sc;
2742 g_topology_assert();
2747 /* Skip synchronization geom. */
2748 if (gp == sc->sc_sync.ds_geom)
2752 } else if (cp != NULL) {
2753 struct g_mirror_disk *disk;
2758 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id);
2759 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
2760 sbuf_printf(sb, "%s<Synchronized>", indent);
2761 if (disk->d_sync.ds_offset_done == 0)
2762 sbuf_printf(sb, "0%%");
2764 sbuf_printf(sb, "%u%%",
2765 (u_int)((disk->d_sync.ds_offset_done * 100) /
2766 sc->sc_provider->mediasize));
2768 sbuf_printf(sb, "</Synchronized>\n");
2770 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
2771 disk->d_sync.ds_syncid);
2772 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent,
2774 sbuf_printf(sb, "%s<Flags>", indent);
2775 if (disk->d_flags == 0)
2776 sbuf_printf(sb, "NONE");
2780 #define ADD_FLAG(flag, name) do { \
2781 if ((disk->d_flags & (flag)) != 0) { \
2783 sbuf_printf(sb, ", "); \
2786 sbuf_printf(sb, name); \
2789 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY");
2790 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED");
2791 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE");
2792 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING,
2794 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
2797 sbuf_printf(sb, "</Flags>\n");
2798 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent,
2800 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
2801 g_mirror_disk_state2str(disk->d_state));
2803 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
2804 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
2805 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
2806 sbuf_printf(sb, "%s<Flags>", indent);
2807 if (sc->sc_flags == 0)
2808 sbuf_printf(sb, "NONE");
2812 #define ADD_FLAG(flag, name) do { \
2813 if ((sc->sc_flags & (flag)) != 0) { \
2815 sbuf_printf(sb, ", "); \
2818 sbuf_printf(sb, name); \
2821 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
2824 sbuf_printf(sb, "</Flags>\n");
2825 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent,
2826 (u_int)sc->sc_slice);
2827 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent,
2828 balance_name(sc->sc_balance));
2829 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
2831 sbuf_printf(sb, "%s<State>", indent);
2832 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
2833 sbuf_printf(sb, "%s", "STARTING");
2834 else if (sc->sc_ndisks ==
2835 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE))
2836 sbuf_printf(sb, "%s", "COMPLETE");
2838 sbuf_printf(sb, "%s", "DEGRADED");
2839 sbuf_printf(sb, "</State>\n");
2844 g_mirror_shutdown(void *arg, int howto)
2847 struct g_geom *gp, *gp2;
2852 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
2853 if (gp->softc == NULL)
2855 g_mirror_destroy(gp->softc, 1);
2857 g_topology_unlock();
2860 tsleep(&gp, PRIBIO, "m:shutdown", hz * 20);
2865 g_mirror_init(struct g_class *mp)
2868 g_mirror_ehtag = EVENTHANDLER_REGISTER(shutdown_post_sync,
2869 g_mirror_shutdown, mp, SHUTDOWN_PRI_FIRST);
2870 if (g_mirror_ehtag == NULL)
2871 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event.");
2875 g_mirror_fini(struct g_class *mp)
2878 if (g_mirror_ehtag == NULL)
2880 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_ehtag);
2883 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror);