2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/eventhandler.h>
37 #include <sys/kernel.h>
38 #include <sys/kthread.h>
39 #include <sys/limits.h>
41 #include <sys/malloc.h>
42 #include <sys/mutex.h>
45 #include <sys/sched.h>
47 #include <sys/sysctl.h>
49 #include <geom/geom.h>
50 #include <geom/geom_dbg.h>
51 #include <geom/mirror/g_mirror.h>
53 FEATURE(geom_mirror, "GEOM mirroring support");
55 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data");
57 SYSCTL_DECL(_kern_geom);
58 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
60 int g_mirror_debug = 0;
61 SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0,
63 bool g_launch_mirror_before_timeout = true;
64 SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout,
65 CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0,
66 "If false, force gmirror to wait out the full kern.geom.mirror.timeout "
67 "before launching mirrors");
68 static u_int g_mirror_timeout = 4;
69 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout,
70 0, "Time to wait on all mirror components");
71 static u_int g_mirror_idletime = 5;
72 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN,
73 &g_mirror_idletime, 0, "Mark components as clean when idling");
74 static u_int g_mirror_disconnect_on_failure = 1;
75 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN,
76 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure.");
77 static u_int g_mirror_syncreqs = 2;
78 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN,
79 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests.");
80 static u_int g_mirror_sync_period = 5;
81 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN,
82 &g_mirror_sync_period, 0,
83 "Metadata update period during synchronization, in seconds");
85 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
86 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
87 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
88 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
91 static eventhandler_tag g_mirror_post_sync = NULL;
92 static int g_mirror_shutdown = 0;
94 static g_ctl_destroy_geom_t g_mirror_destroy_geom;
95 static g_taste_t g_mirror_taste;
96 static g_init_t g_mirror_init;
97 static g_fini_t g_mirror_fini;
98 static g_provgone_t g_mirror_providergone;
99 static g_resize_t g_mirror_resize;
101 struct g_class g_mirror_class = {
102 .name = G_MIRROR_CLASS_NAME,
103 .version = G_VERSION,
104 .ctlreq = g_mirror_config,
105 .taste = g_mirror_taste,
106 .destroy_geom = g_mirror_destroy_geom,
107 .init = g_mirror_init,
108 .fini = g_mirror_fini,
109 .providergone = g_mirror_providergone,
110 .resize = g_mirror_resize
113 static void g_mirror_destroy_provider(struct g_mirror_softc *sc);
114 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state);
115 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force);
116 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent,
117 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
118 static void g_mirror_timeout_drain(struct g_mirror_softc *sc);
119 static int g_mirror_refresh_device(struct g_mirror_softc *sc,
120 const struct g_provider *pp, const struct g_mirror_metadata *md);
121 static void g_mirror_sync_reinit(const struct g_mirror_disk *disk,
122 struct bio *bp, off_t offset);
123 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type);
124 static void g_mirror_register_request(struct g_mirror_softc *sc,
126 static void g_mirror_sync_release(struct g_mirror_softc *sc);
129 g_mirror_disk_state2str(int state)
133 case G_MIRROR_DISK_STATE_NONE:
135 case G_MIRROR_DISK_STATE_NEW:
137 case G_MIRROR_DISK_STATE_ACTIVE:
139 case G_MIRROR_DISK_STATE_STALE:
141 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
142 return ("SYNCHRONIZING");
143 case G_MIRROR_DISK_STATE_DISCONNECTED:
144 return ("DISCONNECTED");
145 case G_MIRROR_DISK_STATE_DESTROY:
153 g_mirror_device_state2str(int state)
157 case G_MIRROR_DEVICE_STATE_STARTING:
159 case G_MIRROR_DEVICE_STATE_RUNNING:
167 g_mirror_get_diskname(struct g_mirror_disk *disk)
170 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
171 return ("[unknown]");
172 return (disk->d_name);
176 * --- Events handling functions ---
177 * Events in geom_mirror are used to maintain disks and device status
178 * from one thread to simplify locking.
181 g_mirror_event_free(struct g_mirror_event *ep)
188 g_mirror_event_dispatch(struct g_mirror_event *ep, void *arg, int state,
191 struct g_mirror_softc *sc;
192 struct g_mirror_disk *disk;
195 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep);
196 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) {
207 mtx_lock(&sc->sc_events_mtx);
208 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
209 mtx_unlock(&sc->sc_events_mtx);
210 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
211 mtx_lock(&sc->sc_queue_mtx);
213 mtx_unlock(&sc->sc_queue_mtx);
214 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0)
216 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
217 sx_xunlock(&sc->sc_lock);
218 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) {
219 mtx_lock(&sc->sc_events_mtx);
220 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event",
224 g_mirror_event_free(ep);
225 sx_xlock(&sc->sc_lock);
230 g_mirror_event_send(void *arg, int state, int flags)
232 struct g_mirror_event *ep;
234 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK);
235 return (g_mirror_event_dispatch(ep, arg, state, flags));
238 static struct g_mirror_event *
239 g_mirror_event_first(struct g_mirror_softc *sc)
241 struct g_mirror_event *ep;
243 mtx_lock(&sc->sc_events_mtx);
244 ep = TAILQ_FIRST(&sc->sc_events);
245 mtx_unlock(&sc->sc_events_mtx);
250 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep)
253 mtx_lock(&sc->sc_events_mtx);
254 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
255 mtx_unlock(&sc->sc_events_mtx);
259 g_mirror_event_cancel(struct g_mirror_disk *disk)
261 struct g_mirror_softc *sc;
262 struct g_mirror_event *ep, *tmpep;
265 sx_assert(&sc->sc_lock, SX_XLOCKED);
267 mtx_lock(&sc->sc_events_mtx);
268 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
269 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0)
271 if (ep->e_disk != disk)
273 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
274 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
275 g_mirror_event_free(ep);
277 ep->e_error = ECANCELED;
281 mtx_unlock(&sc->sc_events_mtx);
285 * Return the number of disks in given state.
286 * If state is equal to -1, count all connected disks.
289 g_mirror_ndisks(struct g_mirror_softc *sc, int state)
291 struct g_mirror_disk *disk;
294 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
295 if (state == -1 || disk->d_state == state)
302 * Find a disk in mirror by its disk ID.
304 static struct g_mirror_disk *
305 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id)
307 struct g_mirror_disk *disk;
309 sx_assert(&sc->sc_lock, SX_XLOCKED);
311 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
312 if (disk->d_id == id)
319 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp)
324 mtx_lock(&sc->sc_queue_mtx);
325 TAILQ_FOREACH(bp, &sc->sc_queue, bio_queue) {
326 if (bp->bio_from == cp)
329 mtx_unlock(&sc->sc_queue_mtx);
334 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp)
339 "I/O requests for %s exist, can't destroy it now.",
343 if (g_mirror_nrequests(sc, cp) > 0) {
345 "I/O requests for %s in queue, can't destroy it now.",
353 g_mirror_destroy_consumer(void *arg, int flags __unused)
355 struct g_consumer *cp;
360 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
362 g_destroy_consumer(cp);
366 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
368 struct g_provider *pp;
374 if (g_mirror_is_busy(sc, cp))
379 if ((pp->geom->flags & G_GEOM_WITHER) == 0)
382 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
383 -cp->acw, -cp->ace, 0);
384 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
385 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
388 * After retaste event was send (inside g_access()), we can send
389 * event to detach and destroy consumer.
390 * A class, which has consumer to the given provider connected
391 * will not receive retaste event for the provider.
392 * This is the way how I ignore retaste events when I close
393 * consumers opened for write: I detach and destroy consumer
394 * after retaste event is sent.
396 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL);
399 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name);
401 g_destroy_consumer(cp);
405 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp)
407 struct g_consumer *cp;
410 g_topology_assert_not();
411 KASSERT(disk->d_consumer == NULL,
412 ("Disk already connected (device %s).", disk->d_softc->sc_name));
415 cp = g_new_consumer(disk->d_softc->sc_geom);
416 cp->flags |= G_CF_DIRECT_RECEIVE;
417 error = g_attach(cp, pp);
419 g_destroy_consumer(cp);
423 error = g_access(cp, 1, 1, 1);
426 g_destroy_consumer(cp);
428 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).",
433 disk->d_consumer = cp;
434 disk->d_consumer->private = disk;
435 disk->d_consumer->index = 0;
437 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk));
442 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
449 if (cp->provider != NULL)
450 g_mirror_kill_consumer(sc, cp);
452 g_destroy_consumer(cp);
456 * Initialize disk. This means allocate memory, create consumer, attach it
457 * to the provider and open access (r1w1e1) to it.
459 static struct g_mirror_disk *
460 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp,
461 struct g_mirror_metadata *md, int *errorp)
463 struct g_mirror_disk *disk;
466 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO);
472 error = g_mirror_connect_disk(disk, pp);
475 disk->d_id = md->md_did;
476 disk->d_state = G_MIRROR_DISK_STATE_NONE;
477 disk->d_priority = md->md_priority;
478 disk->d_flags = md->md_dflags;
479 error = g_getattr("GEOM::candelete", disk->d_consumer, &i);
480 if (error == 0 && i != 0)
481 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE;
482 if (md->md_provider[0] != '\0')
483 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED;
484 disk->d_sync.ds_consumer = NULL;
485 disk->d_sync.ds_offset = md->md_sync_offset;
486 disk->d_sync.ds_offset_done = md->md_sync_offset;
487 disk->d_sync.ds_update_ts = time_uptime;
488 disk->d_genid = md->md_genid;
489 disk->d_sync.ds_syncid = md->md_syncid;
490 disk->d_init_ndisks = md->md_all;
491 disk->d_init_slice = md->md_slice;
492 disk->d_init_balance = md->md_balance;
493 disk->d_init_mediasize = md->md_mediasize;
501 free(disk, M_MIRROR);
506 g_mirror_destroy_disk(struct g_mirror_disk *disk)
508 struct g_mirror_softc *sc;
510 g_topology_assert_not();
512 sx_assert(&sc->sc_lock, SX_XLOCKED);
515 LIST_REMOVE(disk, d_next);
517 g_mirror_event_cancel(disk);
518 if (sc->sc_hint == disk)
520 switch (disk->d_state) {
521 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
522 g_mirror_sync_stop(disk, 1);
524 case G_MIRROR_DISK_STATE_NEW:
525 case G_MIRROR_DISK_STATE_STALE:
526 case G_MIRROR_DISK_STATE_ACTIVE:
528 g_mirror_disconnect_consumer(sc, disk->d_consumer);
530 free(disk, M_MIRROR);
533 KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
534 g_mirror_get_diskname(disk),
535 g_mirror_disk_state2str(disk->d_state)));
540 g_mirror_free_device(struct g_mirror_softc *sc)
545 mtx_destroy(&sc->sc_queue_mtx);
546 mtx_destroy(&sc->sc_events_mtx);
547 mtx_destroy(&sc->sc_done_mtx);
548 sx_destroy(&sc->sc_lock);
553 g_mirror_providergone(struct g_provider *pp)
555 struct g_mirror_softc *sc = pp->private;
557 if ((--sc->sc_refcnt) == 0)
558 g_mirror_free_device(sc);
562 g_mirror_destroy_device(struct g_mirror_softc *sc)
564 struct g_mirror_disk *disk;
565 struct g_mirror_event *ep;
567 struct g_consumer *cp, *tmpcp;
569 g_topology_assert_not();
570 sx_assert(&sc->sc_lock, SX_XLOCKED);
573 if (sc->sc_provider != NULL)
574 g_mirror_destroy_provider(sc);
575 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL;
576 disk = LIST_FIRST(&sc->sc_disks)) {
577 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
578 g_mirror_update_metadata(disk);
579 g_mirror_destroy_disk(disk);
581 while ((ep = g_mirror_event_first(sc)) != NULL) {
582 g_mirror_event_remove(sc, ep);
583 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
584 g_mirror_event_free(ep);
586 ep->e_error = ECANCELED;
587 ep->e_flags |= G_MIRROR_EVENT_DONE;
588 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep);
589 mtx_lock(&sc->sc_events_mtx);
591 mtx_unlock(&sc->sc_events_mtx);
594 g_mirror_timeout_drain(sc);
597 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) {
598 g_mirror_disconnect_consumer(sc, cp);
600 g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
601 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name);
602 g_wither_geom(gp, ENXIO);
603 sx_xunlock(&sc->sc_lock);
604 if ((--sc->sc_refcnt) == 0)
605 g_mirror_free_device(sc);
610 g_mirror_orphan(struct g_consumer *cp)
612 struct g_mirror_disk *disk;
619 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
620 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
621 G_MIRROR_EVENT_DONTWAIT);
625 * Function should return the next active disk on the list.
626 * It is possible that it will be the same disk as given.
627 * If there are no active disks on list, NULL is returned.
629 static __inline struct g_mirror_disk *
630 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
632 struct g_mirror_disk *dp;
634 for (dp = LIST_NEXT(disk, d_next); dp != disk;
635 dp = LIST_NEXT(dp, d_next)) {
637 dp = LIST_FIRST(&sc->sc_disks);
638 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE)
641 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
646 static struct g_mirror_disk *
647 g_mirror_get_disk(struct g_mirror_softc *sc)
649 struct g_mirror_disk *disk;
651 if (sc->sc_hint == NULL) {
652 sc->sc_hint = LIST_FIRST(&sc->sc_disks);
653 if (sc->sc_hint == NULL)
657 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) {
658 disk = g_mirror_find_next(sc, disk);
662 sc->sc_hint = g_mirror_find_next(sc, disk);
667 g_mirror_write_metadata(struct g_mirror_disk *disk,
668 struct g_mirror_metadata *md)
670 struct g_mirror_softc *sc;
671 struct g_consumer *cp;
672 off_t offset, length;
676 g_topology_assert_not();
678 sx_assert(&sc->sc_lock, SX_LOCKED);
680 cp = disk->d_consumer;
681 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
682 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
683 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
684 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
686 length = cp->provider->sectorsize;
687 offset = cp->provider->mediasize - length;
688 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO);
690 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) {
692 * Handle the case, when the size of parent provider reduced.
694 if (offset < md->md_mediasize)
697 mirror_metadata_encode(md, sector);
699 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error);
701 error = g_write_data(cp, offset, sector, length);
702 free(sector, M_MIRROR);
704 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
705 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
706 G_MIRROR_DEBUG(0, "Cannot write metadata on %s "
707 "(device=%s, error=%d).",
708 g_mirror_get_diskname(disk), sc->sc_name, error);
710 G_MIRROR_DEBUG(1, "Cannot write metadata on %s "
711 "(device=%s, error=%d).",
712 g_mirror_get_diskname(disk), sc->sc_name, error);
714 if (g_mirror_disconnect_on_failure &&
715 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) {
716 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
717 g_mirror_event_send(disk,
718 G_MIRROR_DISK_STATE_DISCONNECTED,
719 G_MIRROR_EVENT_DONTWAIT);
726 g_mirror_clear_metadata(struct g_mirror_disk *disk)
730 g_topology_assert_not();
731 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED);
733 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
735 error = g_mirror_write_metadata(disk, NULL);
737 G_MIRROR_DEBUG(2, "Metadata on %s cleared.",
738 g_mirror_get_diskname(disk));
741 "Cannot clear metadata on disk %s (error=%d).",
742 g_mirror_get_diskname(disk), error);
748 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk,
749 struct g_mirror_metadata *md)
752 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic));
753 md->md_version = G_MIRROR_VERSION;
754 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
755 md->md_mid = sc->sc_id;
756 md->md_all = sc->sc_ndisks;
757 md->md_slice = sc->sc_slice;
758 md->md_balance = sc->sc_balance;
759 md->md_genid = sc->sc_genid;
760 md->md_mediasize = sc->sc_mediasize;
761 md->md_sectorsize = sc->sc_sectorsize;
762 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK);
763 bzero(md->md_provider, sizeof(md->md_provider));
765 md->md_did = arc4random();
769 md->md_sync_offset = 0;
772 md->md_did = disk->d_id;
773 md->md_priority = disk->d_priority;
774 md->md_syncid = disk->d_sync.ds_syncid;
775 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK);
776 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
777 md->md_sync_offset = disk->d_sync.ds_offset_done;
779 md->md_sync_offset = 0;
780 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) {
781 strlcpy(md->md_provider,
782 disk->d_consumer->provider->name,
783 sizeof(md->md_provider));
785 md->md_provsize = disk->d_consumer->provider->mediasize;
790 g_mirror_update_metadata(struct g_mirror_disk *disk)
792 struct g_mirror_softc *sc;
793 struct g_mirror_metadata md;
796 g_topology_assert_not();
798 sx_assert(&sc->sc_lock, SX_LOCKED);
800 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
802 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0)
803 g_mirror_fill_metadata(sc, disk, &md);
804 error = g_mirror_write_metadata(disk, &md);
806 G_MIRROR_DEBUG(2, "Metadata on %s updated.",
807 g_mirror_get_diskname(disk));
810 "Cannot update metadata on disk %s (error=%d).",
811 g_mirror_get_diskname(disk), error);
816 g_mirror_bump_syncid(struct g_mirror_softc *sc)
818 struct g_mirror_disk *disk;
820 g_topology_assert_not();
821 sx_assert(&sc->sc_lock, SX_XLOCKED);
822 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
823 ("%s called with no active disks (device=%s).", __func__,
827 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
829 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
830 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
831 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
832 disk->d_sync.ds_syncid = sc->sc_syncid;
833 g_mirror_update_metadata(disk);
839 g_mirror_bump_genid(struct g_mirror_softc *sc)
841 struct g_mirror_disk *disk;
843 g_topology_assert_not();
844 sx_assert(&sc->sc_lock, SX_XLOCKED);
845 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
846 ("%s called with no active disks (device=%s).", __func__,
850 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
852 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
853 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
854 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
855 disk->d_genid = sc->sc_genid;
856 g_mirror_update_metadata(disk);
862 g_mirror_idle(struct g_mirror_softc *sc, int acw)
864 struct g_mirror_disk *disk;
867 g_topology_assert_not();
868 sx_assert(&sc->sc_lock, SX_XLOCKED);
870 if (sc->sc_provider == NULL)
872 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
876 if (sc->sc_writes > 0)
878 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) {
879 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write);
880 if (!g_mirror_shutdown && timeout > 0)
884 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
885 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
887 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.",
888 g_mirror_get_diskname(disk), sc->sc_name);
889 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
890 g_mirror_update_metadata(disk);
896 g_mirror_unidle(struct g_mirror_softc *sc)
898 struct g_mirror_disk *disk;
900 g_topology_assert_not();
901 sx_assert(&sc->sc_lock, SX_XLOCKED);
903 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
906 sc->sc_last_write = time_uptime;
907 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
908 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
910 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.",
911 g_mirror_get_diskname(disk), sc->sc_name);
912 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
913 g_mirror_update_metadata(disk);
918 g_mirror_done(struct bio *bp)
920 struct g_mirror_softc *sc;
922 sc = bp->bio_from->geom->softc;
923 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR;
924 mtx_lock(&sc->sc_queue_mtx);
925 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue);
926 mtx_unlock(&sc->sc_queue_mtx);
931 g_mirror_regular_request_error(struct g_mirror_softc *sc,
932 struct g_mirror_disk *disk, struct bio *bp)
935 if ((bp->bio_cmd == BIO_FLUSH || bp->bio_cmd == BIO_SPEEDUP) &&
936 bp->bio_error == EOPNOTSUPP)
939 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
940 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
941 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).",
944 G_MIRROR_LOGREQ(1, bp, "Request failed (error=%d).",
947 if (g_mirror_disconnect_on_failure &&
948 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) {
949 if (bp->bio_error == ENXIO &&
950 bp->bio_cmd == BIO_READ)
951 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
952 else if (bp->bio_error == ENXIO)
953 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID_NOW;
955 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
956 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
957 G_MIRROR_EVENT_DONTWAIT);
962 g_mirror_regular_request(struct g_mirror_softc *sc, struct bio *bp)
964 struct g_mirror_disk *disk;
967 g_topology_assert_not();
968 KASSERT(sc->sc_provider == bp->bio_parent->bio_to,
969 ("regular request %p with unexpected origin", bp));
971 pbp = bp->bio_parent;
972 bp->bio_from->index--;
973 if (bp->bio_cmd == BIO_WRITE || bp->bio_cmd == BIO_DELETE)
975 disk = bp->bio_from->private;
978 g_mirror_kill_consumer(sc, bp->bio_from);
982 switch (bp->bio_cmd) {
984 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read,
988 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write,
992 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_delete,
996 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_flush,
1000 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_speedup,
1006 KASSERT(pbp->bio_inbed <= pbp->bio_children,
1007 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
1008 pbp->bio_children));
1009 if (bp->bio_error == 0 && pbp->bio_error == 0) {
1010 G_MIRROR_LOGREQ(3, bp, "Request delivered.");
1012 if (pbp->bio_children == pbp->bio_inbed) {
1013 G_MIRROR_LOGREQ(3, pbp, "Request delivered.");
1014 pbp->bio_completed = pbp->bio_length;
1015 if (pbp->bio_cmd == BIO_WRITE ||
1016 pbp->bio_cmd == BIO_DELETE) {
1017 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue);
1018 /* Release delayed sync requests if possible. */
1019 g_mirror_sync_release(sc);
1021 g_io_deliver(pbp, pbp->bio_error);
1024 } else if (bp->bio_error != 0) {
1025 if (pbp->bio_error == 0)
1026 pbp->bio_error = bp->bio_error;
1028 g_mirror_regular_request_error(sc, disk, bp);
1029 switch (pbp->bio_cmd) {
1035 pbp->bio_children--;
1041 switch (pbp->bio_cmd) {
1043 if (pbp->bio_inbed < pbp->bio_children)
1045 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1)
1046 g_io_deliver(pbp, pbp->bio_error);
1049 mtx_lock(&sc->sc_queue_mtx);
1050 TAILQ_INSERT_TAIL(&sc->sc_queue, pbp, bio_queue);
1051 mtx_unlock(&sc->sc_queue_mtx);
1052 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1060 if (pbp->bio_children == 0) {
1062 * All requests failed.
1064 } else if (pbp->bio_inbed < pbp->bio_children) {
1067 } else if (pbp->bio_children == pbp->bio_inbed) {
1068 /* Some requests succeeded. */
1070 pbp->bio_completed = pbp->bio_length;
1072 if (pbp->bio_cmd == BIO_WRITE || pbp->bio_cmd == BIO_DELETE) {
1073 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue);
1074 /* Release delayed sync requests if possible. */
1075 g_mirror_sync_release(sc);
1077 g_io_deliver(pbp, pbp->bio_error);
1080 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd));
1086 g_mirror_sync_done(struct bio *bp)
1088 struct g_mirror_softc *sc;
1090 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered.");
1091 sc = bp->bio_from->geom->softc;
1092 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC;
1093 mtx_lock(&sc->sc_queue_mtx);
1094 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue);
1095 mtx_unlock(&sc->sc_queue_mtx);
1100 g_mirror_candelete(struct bio *bp)
1102 struct g_mirror_softc *sc;
1103 struct g_mirror_disk *disk;
1106 sc = bp->bio_to->private;
1107 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1108 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE)
1112 g_handleattr(bp, "GEOM::candelete", &val, sizeof(val));
1116 g_mirror_kernel_dump(struct bio *bp)
1118 struct g_mirror_softc *sc;
1119 struct g_mirror_disk *disk;
1121 struct g_kerneldump *gkd;
1124 * We configure dumping to the first component, because this component
1125 * will be used for reading with 'prefer' balance algorithm.
1126 * If the component with the highest priority is currently disconnected
1127 * we will not be able to read the dump after the reboot if it will be
1128 * connected and synchronized later. Can we do something better?
1130 sc = bp->bio_to->private;
1131 disk = LIST_FIRST(&sc->sc_disks);
1133 gkd = (struct g_kerneldump *)bp->bio_data;
1134 if (gkd->length > bp->bio_to->mediasize)
1135 gkd->length = bp->bio_to->mediasize;
1136 cbp = g_clone_bio(bp);
1138 g_io_deliver(bp, ENOMEM);
1141 cbp->bio_done = g_std_done;
1142 g_io_request(cbp, disk->d_consumer);
1143 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.",
1144 g_mirror_get_diskname(disk));
1148 g_mirror_start(struct bio *bp)
1150 struct g_mirror_softc *sc;
1152 sc = bp->bio_to->private;
1154 * If sc == NULL or there are no valid disks, provider's error
1155 * should be set and g_mirror_start() should not be called at all.
1157 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
1158 ("Provider's error should be set (error=%d)(mirror=%s).",
1159 bp->bio_to->error, bp->bio_to->name));
1160 G_MIRROR_LOGREQ(3, bp, "Request received.");
1162 switch (bp->bio_cmd) {
1170 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) {
1171 g_mirror_candelete(bp);
1173 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
1174 g_mirror_kernel_dump(bp);
1179 g_io_deliver(bp, EOPNOTSUPP);
1182 mtx_lock(&sc->sc_queue_mtx);
1183 if (bp->bio_to->error != 0) {
1184 mtx_unlock(&sc->sc_queue_mtx);
1185 g_io_deliver(bp, bp->bio_to->error);
1188 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue);
1189 mtx_unlock(&sc->sc_queue_mtx);
1190 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1195 * Return TRUE if the given request is colliding with a in-progress
1196 * synchronization request.
1199 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp)
1201 struct g_mirror_disk *disk;
1203 off_t rstart, rend, sstart, send;
1206 if (sc->sc_sync.ds_ndisks == 0)
1208 rstart = bp->bio_offset;
1209 rend = bp->bio_offset + bp->bio_length;
1210 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1211 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING)
1213 for (i = 0; i < g_mirror_syncreqs; i++) {
1214 sbp = disk->d_sync.ds_bios[i];
1217 sstart = sbp->bio_offset;
1218 send = sbp->bio_offset + sbp->bio_length;
1219 if (rend > sstart && rstart < send)
1227 * Return TRUE if the given sync request is colliding with a in-progress regular
1231 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp)
1233 off_t rstart, rend, sstart, send;
1236 if (sc->sc_sync.ds_ndisks == 0)
1238 sstart = sbp->bio_offset;
1239 send = sbp->bio_offset + sbp->bio_length;
1240 TAILQ_FOREACH(bp, &sc->sc_inflight, bio_queue) {
1241 rstart = bp->bio_offset;
1242 rend = bp->bio_offset + bp->bio_length;
1243 if (rend > sstart && rstart < send)
1250 * Puts regular request onto delayed queue.
1253 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp)
1256 G_MIRROR_LOGREQ(2, bp, "Delaying request.");
1257 TAILQ_INSERT_TAIL(&sc->sc_regular_delayed, bp, bio_queue);
1261 * Puts synchronization request onto delayed queue.
1264 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp)
1267 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request.");
1268 TAILQ_INSERT_TAIL(&sc->sc_sync_delayed, bp, bio_queue);
1272 * Requeue delayed regular requests.
1275 g_mirror_regular_release(struct g_mirror_softc *sc)
1279 if ((bp = TAILQ_FIRST(&sc->sc_regular_delayed)) == NULL)
1281 if (g_mirror_sync_collision(sc, bp))
1284 G_MIRROR_DEBUG(2, "Requeuing regular requests after collision.");
1285 mtx_lock(&sc->sc_queue_mtx);
1286 TAILQ_CONCAT(&sc->sc_regular_delayed, &sc->sc_queue, bio_queue);
1287 TAILQ_SWAP(&sc->sc_regular_delayed, &sc->sc_queue, bio, bio_queue);
1288 mtx_unlock(&sc->sc_queue_mtx);
1292 * Releases delayed sync requests which don't collide anymore with regular
1296 g_mirror_sync_release(struct g_mirror_softc *sc)
1298 struct bio *bp, *bp2;
1300 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed, bio_queue, bp2) {
1301 if (g_mirror_regular_collision(sc, bp))
1303 TAILQ_REMOVE(&sc->sc_sync_delayed, bp, bio_queue);
1304 G_MIRROR_LOGREQ(2, bp,
1305 "Releasing delayed synchronization request.");
1306 g_io_request(bp, bp->bio_from);
1311 * Free a synchronization request and clear its slot in the array.
1314 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp)
1318 if (disk != NULL && disk->d_sync.ds_bios != NULL) {
1319 idx = (int)(uintptr_t)bp->bio_caller1;
1320 KASSERT(disk->d_sync.ds_bios[idx] == bp,
1321 ("unexpected sync BIO at %p:%d", disk, idx));
1322 disk->d_sync.ds_bios[idx] = NULL;
1324 free(bp->bio_data, M_MIRROR);
1329 * Handle synchronization requests.
1330 * Every synchronization request is a two-step process: first, a read request is
1331 * sent to the mirror provider via the sync consumer. If that request completes
1332 * successfully, it is converted to a write and sent to the disk being
1333 * synchronized. If the write also completes successfully, the synchronization
1334 * offset is advanced and a new read request is submitted.
1337 g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp)
1339 struct g_mirror_disk *disk;
1340 struct g_mirror_disk_sync *sync;
1342 KASSERT((bp->bio_cmd == BIO_READ &&
1343 bp->bio_from->geom == sc->sc_sync.ds_geom) ||
1344 (bp->bio_cmd == BIO_WRITE && bp->bio_from->geom == sc->sc_geom),
1345 ("Sync BIO %p with unexpected origin", bp));
1347 bp->bio_from->index--;
1348 disk = bp->bio_from->private;
1350 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
1352 g_mirror_kill_consumer(sc, bp->bio_from);
1353 g_topology_unlock();
1354 g_mirror_sync_request_free(NULL, bp);
1355 sx_xlock(&sc->sc_lock);
1359 sync = &disk->d_sync;
1362 * Synchronization request.
1364 switch (bp->bio_cmd) {
1366 struct g_consumer *cp;
1368 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read,
1371 if (bp->bio_error != 0) {
1372 G_MIRROR_LOGREQ(0, bp,
1373 "Synchronization request failed (error=%d).",
1377 * The read error will trigger a syncid bump, so there's
1378 * no need to do that here.
1380 * The read error handling for regular requests will
1381 * retry the read from all active mirrors before passing
1382 * the error back up, so there's no need to retry here.
1384 g_mirror_sync_request_free(disk, bp);
1385 g_mirror_event_send(disk,
1386 G_MIRROR_DISK_STATE_DISCONNECTED,
1387 G_MIRROR_EVENT_DONTWAIT);
1390 G_MIRROR_LOGREQ(3, bp,
1391 "Synchronization request half-finished.");
1392 bp->bio_cmd = BIO_WRITE;
1394 cp = disk->d_consumer;
1395 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1396 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1397 cp->acr, cp->acw, cp->ace));
1399 g_io_request(bp, cp);
1406 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write,
1409 if (bp->bio_error != 0) {
1410 G_MIRROR_LOGREQ(0, bp,
1411 "Synchronization request failed (error=%d).",
1413 g_mirror_sync_request_free(disk, bp);
1414 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
1415 g_mirror_event_send(disk,
1416 G_MIRROR_DISK_STATE_DISCONNECTED,
1417 G_MIRROR_EVENT_DONTWAIT);
1420 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished.");
1421 if (sync->ds_offset >= sc->sc_mediasize ||
1422 sync->ds_consumer == NULL ||
1423 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1424 /* Don't send more synchronization requests. */
1425 sync->ds_inflight--;
1426 g_mirror_sync_request_free(disk, bp);
1427 if (sync->ds_inflight > 0)
1429 if (sync->ds_consumer == NULL ||
1430 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1433 /* Disk up-to-date, activate it. */
1434 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE,
1435 G_MIRROR_EVENT_DONTWAIT);
1439 /* Send next synchronization request. */
1440 g_mirror_sync_reinit(disk, bp, sync->ds_offset);
1441 sync->ds_offset += bp->bio_length;
1443 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
1444 sync->ds_consumer->index++;
1447 * Delay the request if it is colliding with a regular request.
1449 if (g_mirror_regular_collision(sc, bp))
1450 g_mirror_sync_delay(sc, bp);
1452 g_io_request(bp, sync->ds_consumer);
1454 /* Requeue delayed requests if possible. */
1455 g_mirror_regular_release(sc);
1457 /* Find the smallest offset */
1458 offset = sc->sc_mediasize;
1459 for (i = 0; i < g_mirror_syncreqs; i++) {
1460 bp = sync->ds_bios[i];
1461 if (bp != NULL && bp->bio_offset < offset)
1462 offset = bp->bio_offset;
1464 if (g_mirror_sync_period > 0 &&
1465 time_uptime - sync->ds_update_ts > g_mirror_sync_period) {
1466 sync->ds_offset_done = offset;
1467 g_mirror_update_metadata(disk);
1468 sync->ds_update_ts = time_uptime;
1473 panic("Invalid I/O request %p", bp);
1478 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp)
1480 struct g_mirror_disk *disk;
1481 struct g_consumer *cp;
1484 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1485 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE)
1489 if (bp->bio_error == 0)
1490 bp->bio_error = ENXIO;
1491 g_io_deliver(bp, bp->bio_error);
1494 cbp = g_clone_bio(bp);
1496 if (bp->bio_error == 0)
1497 bp->bio_error = ENOMEM;
1498 g_io_deliver(bp, bp->bio_error);
1502 * Fill in the component buf structure.
1504 cp = disk->d_consumer;
1505 cbp->bio_done = g_mirror_done;
1506 cbp->bio_to = cp->provider;
1507 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1508 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1509 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1512 g_io_request(cbp, cp);
1516 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp)
1518 struct g_mirror_disk *disk;
1519 struct g_consumer *cp;
1522 disk = g_mirror_get_disk(sc);
1524 if (bp->bio_error == 0)
1525 bp->bio_error = ENXIO;
1526 g_io_deliver(bp, bp->bio_error);
1529 cbp = g_clone_bio(bp);
1531 if (bp->bio_error == 0)
1532 bp->bio_error = ENOMEM;
1533 g_io_deliver(bp, bp->bio_error);
1537 * Fill in the component buf structure.
1539 cp = disk->d_consumer;
1540 cbp->bio_done = g_mirror_done;
1541 cbp->bio_to = cp->provider;
1542 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1543 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1544 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1547 g_io_request(cbp, cp);
1550 #define TRACK_SIZE (1 * 1024 * 1024)
1551 #define LOAD_SCALE 256
1552 #define ABS(x) (((x) >= 0) ? (x) : (-(x)))
1555 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp)
1557 struct g_mirror_disk *disk, *dp;
1558 struct g_consumer *cp;
1562 /* Find a disk with the smallest load. */
1565 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1566 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1569 /* If disk head is precisely in position - highly prefer it. */
1570 if (dp->d_last_offset == bp->bio_offset)
1571 prio -= 2 * LOAD_SCALE;
1573 /* If disk head is close to position - prefer it. */
1574 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE)
1575 prio -= 1 * LOAD_SCALE;
1581 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name));
1582 cbp = g_clone_bio(bp);
1584 if (bp->bio_error == 0)
1585 bp->bio_error = ENOMEM;
1586 g_io_deliver(bp, bp->bio_error);
1590 * Fill in the component buf structure.
1592 cp = disk->d_consumer;
1593 cbp->bio_done = g_mirror_done;
1594 cbp->bio_to = cp->provider;
1595 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1596 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1597 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1600 /* Remember last head position */
1601 disk->d_last_offset = bp->bio_offset + bp->bio_length;
1603 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1604 dp->load = (dp->d_consumer->index * LOAD_SCALE +
1607 g_io_request(cbp, cp);
1611 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp)
1613 struct bio_queue queue;
1614 struct g_mirror_disk *disk;
1615 struct g_consumer *cp;
1617 off_t left, mod, offset, slice;
1621 if (bp->bio_length <= sc->sc_slice) {
1622 g_mirror_request_round_robin(sc, bp);
1625 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE);
1626 slice = bp->bio_length / ndisks;
1627 mod = slice % sc->sc_provider->sectorsize;
1629 slice += sc->sc_provider->sectorsize - mod;
1631 * Allocate all bios before sending any request, so we can
1632 * return ENOMEM in nice and clean way.
1634 left = bp->bio_length;
1635 offset = bp->bio_offset;
1636 data = bp->bio_data;
1638 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1639 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1641 cbp = g_clone_bio(bp);
1643 while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
1644 TAILQ_REMOVE(&queue, cbp, bio_queue);
1647 if (bp->bio_error == 0)
1648 bp->bio_error = ENOMEM;
1649 g_io_deliver(bp, bp->bio_error);
1652 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
1653 cbp->bio_done = g_mirror_done;
1654 cbp->bio_caller1 = disk;
1655 cbp->bio_to = disk->d_consumer->provider;
1656 cbp->bio_offset = offset;
1657 cbp->bio_data = data;
1658 cbp->bio_length = MIN(left, slice);
1659 left -= cbp->bio_length;
1662 offset += cbp->bio_length;
1663 data += cbp->bio_length;
1665 while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
1666 TAILQ_REMOVE(&queue, cbp, bio_queue);
1667 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1668 disk = cbp->bio_caller1;
1669 cbp->bio_caller1 = NULL;
1670 cp = disk->d_consumer;
1671 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1672 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1673 cp->acr, cp->acw, cp->ace));
1674 disk->d_consumer->index++;
1675 g_io_request(cbp, disk->d_consumer);
1680 g_mirror_register_request(struct g_mirror_softc *sc, struct bio *bp)
1682 struct bio_queue queue;
1684 struct g_consumer *cp;
1685 struct g_mirror_disk *disk;
1687 sx_assert(&sc->sc_lock, SA_XLOCKED);
1690 * To avoid ordering issues, if a write is deferred because of a
1691 * collision with a sync request, all I/O is deferred until that
1692 * write is initiated.
1694 if (bp->bio_from->geom != sc->sc_sync.ds_geom &&
1695 !TAILQ_EMPTY(&sc->sc_regular_delayed)) {
1696 g_mirror_regular_delay(sc, bp);
1700 switch (bp->bio_cmd) {
1702 switch (sc->sc_balance) {
1703 case G_MIRROR_BALANCE_LOAD:
1704 g_mirror_request_load(sc, bp);
1706 case G_MIRROR_BALANCE_PREFER:
1707 g_mirror_request_prefer(sc, bp);
1709 case G_MIRROR_BALANCE_ROUND_ROBIN:
1710 g_mirror_request_round_robin(sc, bp);
1712 case G_MIRROR_BALANCE_SPLIT:
1713 g_mirror_request_split(sc, bp);
1720 * Delay the request if it is colliding with a synchronization
1723 if (g_mirror_sync_collision(sc, bp)) {
1724 g_mirror_regular_delay(sc, bp);
1729 g_mirror_unidle(sc);
1731 sc->sc_last_write = time_uptime;
1734 * Bump syncid on first write.
1736 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) {
1737 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
1738 g_mirror_bump_syncid(sc);
1742 * Allocate all bios before sending any request, so we can
1743 * return ENOMEM in nice and clean way.
1746 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1747 switch (disk->d_state) {
1748 case G_MIRROR_DISK_STATE_ACTIVE:
1750 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
1751 if (bp->bio_offset >= disk->d_sync.ds_offset)
1757 if (bp->bio_cmd == BIO_DELETE &&
1758 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0)
1760 cbp = g_clone_bio(bp);
1762 while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
1763 TAILQ_REMOVE(&queue, cbp, bio_queue);
1766 if (bp->bio_error == 0)
1767 bp->bio_error = ENOMEM;
1768 g_io_deliver(bp, bp->bio_error);
1771 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
1772 cbp->bio_done = g_mirror_done;
1773 cp = disk->d_consumer;
1774 cbp->bio_caller1 = cp;
1775 cbp->bio_to = cp->provider;
1776 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1777 ("Consumer %s not opened (r%dw%de%d).",
1778 cp->provider->name, cp->acr, cp->acw, cp->ace));
1780 if (TAILQ_EMPTY(&queue)) {
1781 KASSERT(bp->bio_cmd == BIO_DELETE,
1782 ("No consumers for regular request %p", bp));
1783 g_io_deliver(bp, EOPNOTSUPP);
1786 while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
1787 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1788 TAILQ_REMOVE(&queue, cbp, bio_queue);
1789 cp = cbp->bio_caller1;
1790 cbp->bio_caller1 = NULL;
1793 g_io_request(cbp, cp);
1796 * Put request onto inflight queue, so we can check if new
1797 * synchronization requests don't collide with it.
1799 TAILQ_INSERT_TAIL(&sc->sc_inflight, bp, bio_queue);
1804 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1805 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1807 cbp = g_clone_bio(bp);
1809 while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
1810 TAILQ_REMOVE(&queue, cbp, bio_queue);
1813 if (bp->bio_error == 0)
1814 bp->bio_error = ENOMEM;
1815 g_io_deliver(bp, bp->bio_error);
1818 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
1819 cbp->bio_done = g_mirror_done;
1820 cbp->bio_caller1 = disk;
1821 cbp->bio_to = disk->d_consumer->provider;
1823 KASSERT(!TAILQ_EMPTY(&queue),
1824 ("No consumers for regular request %p", bp));
1825 while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
1826 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1827 TAILQ_REMOVE(&queue, cbp, bio_queue);
1828 disk = cbp->bio_caller1;
1829 cbp->bio_caller1 = NULL;
1830 cp = disk->d_consumer;
1831 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1832 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1833 cp->acr, cp->acw, cp->ace));
1835 g_io_request(cbp, cp);
1839 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1840 bp->bio_cmd, sc->sc_name));
1846 g_mirror_can_destroy(struct g_mirror_softc *sc)
1849 struct g_consumer *cp;
1851 g_topology_assert();
1853 if (gp->softc == NULL)
1855 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0)
1857 LIST_FOREACH(cp, &gp->consumer, consumer) {
1858 if (g_mirror_is_busy(sc, cp))
1861 gp = sc->sc_sync.ds_geom;
1862 LIST_FOREACH(cp, &gp->consumer, consumer) {
1863 if (g_mirror_is_busy(sc, cp))
1866 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
1872 g_mirror_try_destroy(struct g_mirror_softc *sc)
1875 if (sc->sc_rootmount != NULL) {
1876 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
1878 root_mount_rel(sc->sc_rootmount);
1879 sc->sc_rootmount = NULL;
1882 if (!g_mirror_can_destroy(sc)) {
1883 g_topology_unlock();
1886 sc->sc_geom->softc = NULL;
1887 sc->sc_sync.ds_geom->softc = NULL;
1888 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DRAIN) != 0) {
1889 g_topology_unlock();
1890 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1892 /* Unlock sc_lock here, as it can be destroyed after wakeup. */
1893 sx_xunlock(&sc->sc_lock);
1894 wakeup(&sc->sc_worker);
1895 sc->sc_worker = NULL;
1897 g_topology_unlock();
1898 g_mirror_destroy_device(sc);
1907 g_mirror_worker(void *arg)
1909 struct g_mirror_softc *sc;
1910 struct g_mirror_event *ep;
1915 thread_lock(curthread);
1916 sched_prio(curthread, PRIBIO);
1917 thread_unlock(curthread);
1919 sx_xlock(&sc->sc_lock);
1921 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__);
1923 * First take a look at events.
1924 * This is important to handle events before any I/O requests.
1926 ep = g_mirror_event_first(sc);
1928 g_mirror_event_remove(sc, ep);
1929 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) {
1930 /* Update only device status. */
1932 "Running event for device %s.",
1935 g_mirror_update_device(sc, true);
1937 /* Update disk status. */
1938 G_MIRROR_DEBUG(3, "Running event for disk %s.",
1939 g_mirror_get_diskname(ep->e_disk));
1940 ep->e_error = g_mirror_update_disk(ep->e_disk,
1942 if (ep->e_error == 0)
1943 g_mirror_update_device(sc, false);
1945 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) {
1946 KASSERT(ep->e_error == 0,
1947 ("Error cannot be handled."));
1948 g_mirror_event_free(ep);
1950 ep->e_flags |= G_MIRROR_EVENT_DONE;
1951 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1953 mtx_lock(&sc->sc_events_mtx);
1955 mtx_unlock(&sc->sc_events_mtx);
1958 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1959 if (g_mirror_try_destroy(sc)) {
1960 curthread->td_pflags &= ~TDP_GEOM;
1961 G_MIRROR_DEBUG(1, "Thread exiting.");
1965 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__);
1970 * Check if we can mark array as CLEAN and if we can't take
1971 * how much seconds should we wait.
1973 timeout = g_mirror_idle(sc, -1);
1976 * Handle I/O requests.
1978 mtx_lock(&sc->sc_queue_mtx);
1979 bp = TAILQ_FIRST(&sc->sc_queue);
1981 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue);
1984 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1985 mtx_unlock(&sc->sc_queue_mtx);
1986 if (g_mirror_try_destroy(sc)) {
1987 curthread->td_pflags &= ~TDP_GEOM;
1988 G_MIRROR_DEBUG(1, "Thread exiting.");
1991 mtx_lock(&sc->sc_queue_mtx);
1992 if (!TAILQ_EMPTY(&sc->sc_queue)) {
1993 mtx_unlock(&sc->sc_queue_mtx);
1997 if (g_mirror_event_first(sc) != NULL) {
1998 mtx_unlock(&sc->sc_queue_mtx);
2001 sx_xunlock(&sc->sc_lock);
2002 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1",
2004 sx_xlock(&sc->sc_lock);
2005 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__);
2008 mtx_unlock(&sc->sc_queue_mtx);
2010 if (bp->bio_from->geom == sc->sc_sync.ds_geom &&
2011 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) {
2013 * Handle completion of the first half (the read) of a
2014 * block synchronization operation.
2016 g_mirror_sync_request(sc, bp);
2017 } else if (bp->bio_to != sc->sc_provider) {
2018 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0)
2020 * Handle completion of a regular I/O request.
2022 g_mirror_regular_request(sc, bp);
2023 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
2025 * Handle completion of the second half (the
2026 * write) of a block synchronization operation.
2028 g_mirror_sync_request(sc, bp);
2031 ("Invalid request cflags=0x%hx to=%s.",
2032 bp->bio_cflags, bp->bio_to->name));
2036 * Initiate an I/O request.
2038 g_mirror_register_request(sc, bp);
2040 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__);
2045 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
2048 sx_assert(&sc->sc_lock, SX_LOCKED);
2050 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
2052 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) {
2053 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.",
2054 g_mirror_get_diskname(disk), sc->sc_name);
2055 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
2056 } else if (sc->sc_idle &&
2057 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
2058 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.",
2059 g_mirror_get_diskname(disk), sc->sc_name);
2060 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2065 g_mirror_sync_reinit(const struct g_mirror_disk *disk, struct bio *bp,
2071 data = bp->bio_data;
2072 idx = (int)(uintptr_t)bp->bio_caller1;
2075 bp->bio_cmd = BIO_READ;
2076 bp->bio_data = data;
2077 bp->bio_done = g_mirror_sync_done;
2078 bp->bio_from = disk->d_sync.ds_consumer;
2079 bp->bio_to = disk->d_softc->sc_provider;
2080 bp->bio_caller1 = (void *)(uintptr_t)idx;
2081 bp->bio_offset = offset;
2082 bp->bio_length = MIN(maxphys,
2083 disk->d_softc->sc_mediasize - bp->bio_offset);
2087 g_mirror_sync_start(struct g_mirror_disk *disk)
2089 struct g_mirror_softc *sc;
2090 struct g_mirror_disk_sync *sync;
2091 struct g_consumer *cp;
2095 g_topology_assert_not();
2097 sync = &disk->d_sync;
2098 sx_assert(&sc->sc_lock, SX_LOCKED);
2100 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2101 ("Disk %s is not marked for synchronization.",
2102 g_mirror_get_diskname(disk)));
2103 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2104 ("Device not in RUNNING state (%s, %u).", sc->sc_name,
2107 sx_xunlock(&sc->sc_lock);
2109 cp = g_new_consumer(sc->sc_sync.ds_geom);
2110 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
2111 error = g_attach(cp, sc->sc_provider);
2113 ("Cannot attach to %s (error=%d).", sc->sc_name, error));
2114 error = g_access(cp, 1, 0, 0);
2115 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error));
2116 g_topology_unlock();
2117 sx_xlock(&sc->sc_lock);
2119 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
2120 g_mirror_get_diskname(disk));
2121 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0)
2122 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
2123 KASSERT(sync->ds_consumer == NULL,
2124 ("Sync consumer already exists (device=%s, disk=%s).",
2125 sc->sc_name, g_mirror_get_diskname(disk)));
2127 sync->ds_consumer = cp;
2128 sync->ds_consumer->private = disk;
2129 sync->ds_consumer->index = 0;
2132 * Allocate memory for synchronization bios and initialize them.
2134 sync->ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs,
2135 M_MIRROR, M_WAITOK);
2136 for (i = 0; i < g_mirror_syncreqs; i++) {
2138 sync->ds_bios[i] = bp;
2140 bp->bio_data = malloc(maxphys, M_MIRROR, M_WAITOK);
2141 bp->bio_caller1 = (void *)(uintptr_t)i;
2142 g_mirror_sync_reinit(disk, bp, sync->ds_offset);
2143 sync->ds_offset += bp->bio_length;
2146 /* Increase the number of disks in SYNCHRONIZING state. */
2147 sc->sc_sync.ds_ndisks++;
2148 /* Set the number of in-flight synchronization requests. */
2149 sync->ds_inflight = g_mirror_syncreqs;
2152 * Fire off first synchronization requests.
2154 for (i = 0; i < g_mirror_syncreqs; i++) {
2155 bp = sync->ds_bios[i];
2156 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
2157 sync->ds_consumer->index++;
2159 * Delay the request if it is colliding with a regular request.
2161 if (g_mirror_regular_collision(sc, bp))
2162 g_mirror_sync_delay(sc, bp);
2164 g_io_request(bp, sync->ds_consumer);
2169 * Stop synchronization process.
2170 * type: 0 - synchronization finished
2171 * 1 - synchronization stopped
2174 g_mirror_sync_stop(struct g_mirror_disk *disk, int type)
2176 struct g_mirror_softc *sc;
2177 struct g_consumer *cp;
2179 g_topology_assert_not();
2181 sx_assert(&sc->sc_lock, SX_LOCKED);
2183 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2184 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2185 g_mirror_disk_state2str(disk->d_state)));
2186 if (disk->d_sync.ds_consumer == NULL)
2190 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.",
2191 sc->sc_name, g_mirror_get_diskname(disk));
2192 } else /* if (type == 1) */ {
2193 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
2194 sc->sc_name, g_mirror_get_diskname(disk));
2196 g_mirror_regular_release(sc);
2197 free(disk->d_sync.ds_bios, M_MIRROR);
2198 disk->d_sync.ds_bios = NULL;
2199 cp = disk->d_sync.ds_consumer;
2200 disk->d_sync.ds_consumer = NULL;
2201 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2202 sc->sc_sync.ds_ndisks--;
2203 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
2205 g_mirror_kill_consumer(sc, cp);
2206 g_topology_unlock();
2207 sx_xlock(&sc->sc_lock);
2211 g_mirror_launch_provider(struct g_mirror_softc *sc)
2213 struct g_mirror_disk *disk;
2214 struct g_provider *pp, *dp;
2216 sx_assert(&sc->sc_lock, SX_LOCKED);
2219 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name);
2220 pp->flags |= G_PF_DIRECT_RECEIVE;
2221 pp->mediasize = sc->sc_mediasize;
2222 pp->sectorsize = sc->sc_sectorsize;
2224 pp->stripeoffset = 0;
2226 /* Splitting of unmapped BIO's could work but isn't implemented now */
2227 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT)
2228 pp->flags |= G_PF_ACCEPT_UNMAPPED;
2230 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2231 if (disk->d_consumer && disk->d_consumer->provider) {
2232 dp = disk->d_consumer->provider;
2233 if (dp->stripesize > pp->stripesize) {
2234 pp->stripesize = dp->stripesize;
2235 pp->stripeoffset = dp->stripeoffset;
2237 /* A provider underneath us doesn't support unmapped */
2238 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
2239 G_MIRROR_DEBUG(0, "Cancelling unmapped "
2240 "because of %s.", dp->name);
2241 pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
2247 sc->sc_provider = pp;
2248 g_error_provider(pp, 0);
2249 g_topology_unlock();
2250 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name,
2251 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks);
2252 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2253 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
2254 g_mirror_sync_start(disk);
2259 g_mirror_destroy_provider(struct g_mirror_softc *sc)
2261 struct g_mirror_disk *disk;
2264 g_topology_assert_not();
2265 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
2268 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2269 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
2270 g_mirror_sync_stop(disk, 1);
2274 g_error_provider(sc->sc_provider, ENXIO);
2275 mtx_lock(&sc->sc_queue_mtx);
2276 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) {
2277 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue);
2279 * Abort any pending I/O that wasn't generated by us.
2280 * Synchronization requests and requests destined for individual
2281 * mirror components can be destroyed immediately.
2283 if (bp->bio_to == sc->sc_provider &&
2284 bp->bio_from->geom != sc->sc_sync.ds_geom) {
2285 g_io_deliver(bp, ENXIO);
2287 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
2288 free(bp->bio_data, M_MIRROR);
2292 mtx_unlock(&sc->sc_queue_mtx);
2293 g_wither_provider(sc->sc_provider, ENXIO);
2294 sc->sc_provider = NULL;
2295 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name);
2296 g_topology_unlock();
2300 g_mirror_go(void *arg)
2302 struct g_mirror_softc *sc;
2303 struct g_mirror_event *ep;
2306 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
2307 ep = sc->sc_timeout_event;
2308 sc->sc_timeout_event = NULL;
2309 g_mirror_event_dispatch(ep, sc, 0,
2310 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE);
2314 g_mirror_timeout_drain(struct g_mirror_softc *sc)
2316 sx_assert(&sc->sc_lock, SX_XLOCKED);
2318 callout_drain(&sc->sc_callout);
2319 g_mirror_event_free(sc->sc_timeout_event);
2320 sc->sc_timeout_event = NULL;
2324 g_mirror_determine_state(struct g_mirror_disk *disk)
2326 struct g_mirror_softc *sc;
2330 if (sc->sc_syncid == disk->d_sync.ds_syncid) {
2331 if ((disk->d_flags &
2332 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0 &&
2333 (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 ||
2334 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) {
2335 /* Disk does not need synchronization. */
2336 state = G_MIRROR_DISK_STATE_ACTIVE;
2339 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2341 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
2343 * We can start synchronization from
2344 * the stored offset.
2346 state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
2348 state = G_MIRROR_DISK_STATE_STALE;
2351 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
2353 * Reset all synchronization data for this disk,
2354 * because if it even was synchronized, it was
2355 * synchronized to disks with different syncid.
2357 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2358 disk->d_sync.ds_offset = 0;
2359 disk->d_sync.ds_offset_done = 0;
2360 disk->d_sync.ds_syncid = sc->sc_syncid;
2361 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2362 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
2363 state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
2365 state = G_MIRROR_DISK_STATE_STALE;
2367 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
2369 * Not good, NOT GOOD!
2370 * It means that mirror was started on stale disks
2371 * and more fresh disk just arrive.
2372 * If there were writes, mirror is broken, sorry.
2373 * I think the best choice here is don't touch
2374 * this disk and inform the user loudly.
2376 G_MIRROR_DEBUG(0, "Device %s was started before the freshest "
2377 "disk (%s) arrives!! It will not be connected to the "
2378 "running device.", sc->sc_name,
2379 g_mirror_get_diskname(disk));
2380 g_mirror_destroy_disk(disk);
2381 state = G_MIRROR_DISK_STATE_NONE;
2382 /* Return immediately, because disk was destroyed. */
2385 G_MIRROR_DEBUG(3, "State for %s disk: %s.",
2386 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state));
2391 * Update device state.
2394 g_mirror_update_device(struct g_mirror_softc *sc, bool force)
2396 struct g_mirror_disk *disk;
2399 sx_assert(&sc->sc_lock, SX_XLOCKED);
2401 switch (sc->sc_state) {
2402 case G_MIRROR_DEVICE_STATE_STARTING:
2404 struct g_mirror_disk *pdisk, *tdisk;
2405 const char *mismatch;
2406 uintmax_t found, newest;
2407 u_int dirty, ndisks;
2409 /* Pre-flight checks */
2410 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) {
2412 * Confirm we already detected the newest genid.
2414 KASSERT(sc->sc_genid >= disk->d_genid,
2415 ("%s: found newer genid %u (sc:%p had %u).", __func__,
2416 disk->d_genid, sc, sc->sc_genid));
2418 /* Kick out any previously tasted stale components. */
2419 if (disk->d_genid < sc->sc_genid) {
2420 G_MIRROR_DEBUG(0, "Stale 'genid' field on %s "
2421 "(device %s) (component=%u latest=%u), skipping.",
2422 g_mirror_get_diskname(disk), sc->sc_name,
2423 disk->d_genid, sc->sc_genid);
2424 g_mirror_destroy_disk(disk);
2425 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2430 * Confirm we already detected the newest syncid.
2432 KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid,
2433 ("%s: found newer syncid %u (sc:%p had %u).",
2434 __func__, disk->d_sync.ds_syncid, sc,
2437 #define DETECT_MISMATCH(field, name) \
2438 if (mismatch == NULL && \
2439 disk->d_init_ ## field != sc->sc_ ## field) { \
2441 found = (intmax_t)disk->d_init_ ## field; \
2442 newest = (intmax_t)sc->sc_ ## field; \
2445 DETECT_MISMATCH(ndisks, "md_all");
2446 DETECT_MISMATCH(balance, "md_balance");
2447 DETECT_MISMATCH(slice, "md_slice");
2448 DETECT_MISMATCH(mediasize, "md_mediasize");
2449 #undef DETECT_MISMATCH
2450 if (mismatch != NULL) {
2451 G_MIRROR_DEBUG(0, "Found a mismatching '%s' "
2452 "field on %s (device %s) (found=%ju "
2453 "newest=%ju).", mismatch,
2454 g_mirror_get_diskname(disk), sc->sc_name,
2456 g_mirror_destroy_disk(disk);
2457 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2462 KASSERT(sc->sc_provider == NULL,
2463 ("Non-NULL provider in STARTING state (%s).", sc->sc_name));
2465 * Are we ready? If the timeout (force is true) has expired, and
2466 * any disks are present, then yes. If we're permitted to launch
2467 * before the timeout has expired and the expected number of
2468 * current-generation mirror disks have been tasted, then yes.
2470 ndisks = g_mirror_ndisks(sc, -1);
2471 if ((force && ndisks > 0) ||
2472 (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) {
2474 } else if (ndisks == 0) {
2476 * Disks went down in starting phase, so destroy
2479 g_mirror_timeout_drain(sc);
2480 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2481 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2483 root_mount_rel(sc->sc_rootmount);
2484 sc->sc_rootmount = NULL;
2491 * Activate all disks with the biggest syncid.
2495 * If 'force' is true, we have been called due to
2496 * timeout, so don't bother canceling timeout.
2499 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2500 if ((disk->d_flags &
2501 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
2506 /* No valid disks found, destroy device. */
2507 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2508 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2509 __LINE__, sc->sc_rootmount);
2510 root_mount_rel(sc->sc_rootmount);
2511 sc->sc_rootmount = NULL;
2515 /* Cancel timeout. */
2516 g_mirror_timeout_drain(sc);
2520 * Here we need to look for dirty disks and if all disks
2521 * with the biggest syncid are dirty, we have to choose
2522 * one with the biggest priority and rebuild the rest.
2525 * Find the number of dirty disks with the biggest syncid.
2526 * Find the number of disks with the biggest syncid.
2527 * While here, find a disk with the biggest priority.
2531 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2532 if (disk->d_sync.ds_syncid != sc->sc_syncid)
2534 if ((disk->d_flags &
2535 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2539 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
2541 if (pdisk == NULL ||
2542 pdisk->d_priority < disk->d_priority) {
2548 /* No dirty disks at all, great. */
2549 } else if (dirty == ndisks) {
2551 * Force synchronization for all dirty disks except one
2552 * with the biggest priority.
2554 KASSERT(pdisk != NULL, ("pdisk == NULL"));
2555 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a "
2556 "master disk for synchronization.",
2557 g_mirror_get_diskname(pdisk), sc->sc_name);
2558 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2559 if (disk->d_sync.ds_syncid != sc->sc_syncid)
2561 if ((disk->d_flags &
2562 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2565 KASSERT((disk->d_flags &
2566 G_MIRROR_DISK_FLAG_DIRTY) != 0,
2567 ("Disk %s isn't marked as dirty.",
2568 g_mirror_get_diskname(disk)));
2569 /* Skip the disk with the biggest priority. */
2572 disk->d_sync.ds_syncid = 0;
2574 } else if (dirty < ndisks) {
2576 * Force synchronization for all dirty disks.
2577 * We have some non-dirty disks.
2579 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2580 if (disk->d_sync.ds_syncid != sc->sc_syncid)
2582 if ((disk->d_flags &
2583 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2586 if ((disk->d_flags &
2587 G_MIRROR_DISK_FLAG_DIRTY) == 0) {
2590 disk->d_sync.ds_syncid = 0;
2597 /* Remember to bump syncid on first write. */
2598 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2600 state = G_MIRROR_DEVICE_STATE_RUNNING;
2601 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.",
2602 sc->sc_name, g_mirror_device_state2str(sc->sc_state),
2603 g_mirror_device_state2str(state));
2604 sc->sc_state = state;
2605 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2606 state = g_mirror_determine_state(disk);
2607 g_mirror_event_send(disk, state,
2608 G_MIRROR_EVENT_DONTWAIT);
2609 if (state == G_MIRROR_DISK_STATE_STALE)
2610 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2614 case G_MIRROR_DEVICE_STATE_RUNNING:
2615 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 &&
2616 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2618 * No usable disks, so destroy the device.
2620 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2622 } else if (g_mirror_ndisks(sc,
2623 G_MIRROR_DISK_STATE_ACTIVE) > 0 &&
2624 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2626 * We have active disks, launch provider if it doesn't
2629 if (sc->sc_provider == NULL)
2630 g_mirror_launch_provider(sc);
2631 if (sc->sc_rootmount != NULL) {
2632 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2633 __LINE__, sc->sc_rootmount);
2634 root_mount_rel(sc->sc_rootmount);
2635 sc->sc_rootmount = NULL;
2639 * Genid should be bumped immediately, so do it here.
2641 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) {
2642 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID;
2643 g_mirror_bump_genid(sc);
2645 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) {
2646 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW;
2647 g_mirror_bump_syncid(sc);
2651 KASSERT(1 == 0, ("Wrong device state (%s, %s).",
2652 sc->sc_name, g_mirror_device_state2str(sc->sc_state)));
2658 * Update disk state and device state if needed.
2660 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \
2661 "Disk %s state changed from %s to %s (device %s).", \
2662 g_mirror_get_diskname(disk), \
2663 g_mirror_disk_state2str(disk->d_state), \
2664 g_mirror_disk_state2str(state), sc->sc_name)
2666 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state)
2668 struct g_mirror_softc *sc;
2671 sx_assert(&sc->sc_lock, SX_XLOCKED);
2674 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.",
2675 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state),
2676 g_mirror_disk_state2str(state));
2678 case G_MIRROR_DISK_STATE_NEW:
2680 * Possible scenarios:
2681 * 1. New disk arrive.
2683 /* Previous state should be NONE. */
2684 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE,
2685 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2686 g_mirror_disk_state2str(disk->d_state)));
2687 DISK_STATE_CHANGED();
2689 disk->d_state = state;
2691 if (LIST_EMPTY(&sc->sc_disks))
2692 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next);
2694 struct g_mirror_disk *dp;
2696 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
2697 if (disk->d_priority >= dp->d_priority) {
2698 LIST_INSERT_BEFORE(dp, disk, d_next);
2702 if (LIST_NEXT(dp, d_next) == NULL)
2706 LIST_INSERT_AFTER(dp, disk, d_next);
2708 g_topology_unlock();
2709 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.",
2710 sc->sc_name, g_mirror_get_diskname(disk));
2711 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
2713 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2714 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2715 g_mirror_device_state2str(sc->sc_state),
2716 g_mirror_get_diskname(disk),
2717 g_mirror_disk_state2str(disk->d_state)));
2718 state = g_mirror_determine_state(disk);
2719 if (state != G_MIRROR_DISK_STATE_NONE)
2722 case G_MIRROR_DISK_STATE_ACTIVE:
2724 * Possible scenarios:
2725 * 1. New disk does not need synchronization.
2726 * 2. Synchronization process finished successfully.
2728 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2729 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2730 g_mirror_device_state2str(sc->sc_state),
2731 g_mirror_get_diskname(disk),
2732 g_mirror_disk_state2str(disk->d_state)));
2733 /* Previous state should be NEW or SYNCHRONIZING. */
2734 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW ||
2735 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2736 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2737 g_mirror_disk_state2str(disk->d_state)));
2738 DISK_STATE_CHANGED();
2740 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
2741 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2742 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC;
2743 g_mirror_sync_stop(disk, 0);
2745 disk->d_state = state;
2746 disk->d_sync.ds_offset = 0;
2747 disk->d_sync.ds_offset_done = 0;
2748 g_mirror_update_idle(sc, disk);
2749 g_mirror_update_metadata(disk);
2750 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.",
2751 sc->sc_name, g_mirror_get_diskname(disk));
2753 case G_MIRROR_DISK_STATE_STALE:
2755 * Possible scenarios:
2756 * 1. Stale disk was connected.
2758 /* Previous state should be NEW. */
2759 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2760 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2761 g_mirror_disk_state2str(disk->d_state)));
2762 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2763 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2764 g_mirror_device_state2str(sc->sc_state),
2765 g_mirror_get_diskname(disk),
2766 g_mirror_disk_state2str(disk->d_state)));
2768 * STALE state is only possible if device is marked
2771 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0,
2772 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2773 g_mirror_device_state2str(sc->sc_state),
2774 g_mirror_get_diskname(disk),
2775 g_mirror_disk_state2str(disk->d_state)));
2776 DISK_STATE_CHANGED();
2778 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2779 disk->d_state = state;
2780 g_mirror_update_metadata(disk);
2781 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.",
2782 sc->sc_name, g_mirror_get_diskname(disk));
2784 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
2786 * Possible scenarios:
2787 * 1. Disk which needs synchronization was connected.
2789 /* Previous state should be NEW. */
2790 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2791 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2792 g_mirror_disk_state2str(disk->d_state)));
2793 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2794 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2795 g_mirror_device_state2str(sc->sc_state),
2796 g_mirror_get_diskname(disk),
2797 g_mirror_disk_state2str(disk->d_state)));
2798 DISK_STATE_CHANGED();
2800 if (disk->d_state == G_MIRROR_DISK_STATE_NEW)
2801 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2802 disk->d_state = state;
2803 if (sc->sc_provider != NULL) {
2804 g_mirror_sync_start(disk);
2805 g_mirror_update_metadata(disk);
2808 case G_MIRROR_DISK_STATE_DISCONNECTED:
2810 * Possible scenarios:
2811 * 1. Device wasn't running yet, but disk disappear.
2812 * 2. Disk was active and disapppear.
2813 * 3. Disk disappear during synchronization process.
2815 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) {
2817 * Previous state should be ACTIVE, STALE or
2820 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
2821 disk->d_state == G_MIRROR_DISK_STATE_STALE ||
2822 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2823 ("Wrong disk state (%s, %s).",
2824 g_mirror_get_diskname(disk),
2825 g_mirror_disk_state2str(disk->d_state)));
2826 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) {
2827 /* Previous state should be NEW. */
2828 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2829 ("Wrong disk state (%s, %s).",
2830 g_mirror_get_diskname(disk),
2831 g_mirror_disk_state2str(disk->d_state)));
2833 * Reset bumping syncid if disk disappeared in STARTING
2836 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0)
2837 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
2840 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
2842 g_mirror_device_state2str(sc->sc_state),
2843 g_mirror_get_diskname(disk),
2844 g_mirror_disk_state2str(disk->d_state)));
2847 DISK_STATE_CHANGED();
2848 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.",
2849 sc->sc_name, g_mirror_get_diskname(disk));
2851 g_mirror_destroy_disk(disk);
2853 case G_MIRROR_DISK_STATE_DESTROY:
2857 error = g_mirror_clear_metadata(disk);
2860 "Device %s: failed to clear metadata on %s: %d.",
2861 sc->sc_name, g_mirror_get_diskname(disk), error);
2864 DISK_STATE_CHANGED();
2865 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.",
2866 sc->sc_name, g_mirror_get_diskname(disk));
2868 g_mirror_destroy_disk(disk);
2870 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2871 g_mirror_update_metadata(disk);
2876 KASSERT(1 == 0, ("Unknown state (%u).", state));
2881 #undef DISK_STATE_CHANGED
2884 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md)
2886 struct g_provider *pp;
2890 g_topology_assert();
2892 error = g_access(cp, 1, 0, 0);
2896 g_topology_unlock();
2897 /* Metadata are stored on last sector. */
2898 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
2901 g_access(cp, -1, 0, 0);
2903 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).",
2904 cp->provider->name, error);
2908 /* Decode metadata. */
2909 error = mirror_metadata_decode(buf, md);
2911 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0)
2913 if (md->md_version > G_MIRROR_VERSION) {
2915 "Kernel module is too old to handle metadata from %s.",
2916 cp->provider->name);
2920 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
2921 cp->provider->name);
2929 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp,
2930 struct g_mirror_metadata *md)
2933 G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x "
2934 "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x "
2935 "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx "
2936 "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx "
2937 "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x "
2939 __func__, md->md_did, pp->name, sc->sc_name, md->md_all,
2940 sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance,
2941 sc->sc_balance, (uintmax_t)sc->sc_mediasize,
2942 (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize,
2943 (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid,
2944 md->md_genid, md->md_priority, sc->sc_state);
2946 if (g_mirror_id2disk(sc, md->md_did) != NULL) {
2947 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.",
2948 pp->name, md->md_did);
2951 if (sc->sc_mediasize > pp->mediasize) {
2953 "Invalid size of disk %s (device %s), skipping.", pp->name,
2957 if (md->md_sectorsize != sc->sc_sectorsize) {
2959 "Invalid '%s' field on disk %s (device %s), skipping.",
2960 "md_sectorsize", pp->name, sc->sc_name);
2963 if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
2965 "Invalid sector size of disk %s (device %s), skipping.",
2966 pp->name, sc->sc_name);
2969 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) {
2971 "Invalid device flags on disk %s (device %s), skipping.",
2972 pp->name, sc->sc_name);
2975 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) {
2977 "Invalid disk flags on disk %s (device %s), skipping.",
2978 pp->name, sc->sc_name);
2985 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
2986 struct g_mirror_metadata *md)
2988 struct g_mirror_disk *disk;
2991 g_topology_assert_not();
2992 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name);
2994 error = g_mirror_check_metadata(sc, pp, md);
2998 if (md->md_genid < sc->sc_genid) {
2999 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.",
3000 pp->name, sc->sc_name);
3005 * If the component disk we're tasting has newer metadata than the
3006 * STARTING gmirror device, refresh the device from the component.
3008 error = g_mirror_refresh_device(sc, pp, md);
3012 disk = g_mirror_init_disk(sc, pp, md, &error);
3015 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW,
3016 G_MIRROR_EVENT_WAIT);
3019 if (md->md_version < G_MIRROR_VERSION) {
3020 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
3021 pp->name, md->md_version, G_MIRROR_VERSION);
3022 g_mirror_update_metadata(disk);
3028 g_mirror_destroy_delayed(void *arg, int flag)
3030 struct g_mirror_softc *sc;
3033 if (flag == EV_CANCEL) {
3034 G_MIRROR_DEBUG(1, "Destroying canceled.");
3038 g_topology_unlock();
3039 sx_xlock(&sc->sc_lock);
3040 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0,
3041 ("DESTROY flag set on %s.", sc->sc_name));
3042 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0,
3043 ("CLOSEWAIT flag not set on %s.", sc->sc_name));
3044 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name);
3045 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT);
3047 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).",
3048 sc->sc_name, error);
3049 sx_xunlock(&sc->sc_lock);
3055 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace)
3057 struct g_mirror_softc *sc;
3060 g_topology_assert();
3061 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
3065 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name));
3067 g_topology_unlock();
3068 sx_xlock(&sc->sc_lock);
3069 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 ||
3070 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 ||
3071 LIST_EMPTY(&sc->sc_disks)) {
3072 if (acr > 0 || acw > 0 || ace > 0)
3076 sc->sc_provider_open += acr + acw + ace;
3077 if (pp->acw + acw == 0)
3078 g_mirror_idle(sc, 0);
3079 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 &&
3080 sc->sc_provider_open == 0)
3081 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL);
3083 sx_xunlock(&sc->sc_lock);
3089 g_mirror_reinit_from_metadata(struct g_mirror_softc *sc,
3090 const struct g_mirror_metadata *md)
3093 sc->sc_genid = md->md_genid;
3094 sc->sc_syncid = md->md_syncid;
3096 sc->sc_slice = md->md_slice;
3097 sc->sc_balance = md->md_balance;
3098 sc->sc_mediasize = md->md_mediasize;
3099 sc->sc_ndisks = md->md_all;
3100 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK;
3101 sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK);
3105 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md,
3108 struct g_mirror_softc *sc;
3112 g_topology_assert();
3113 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
3116 /* One disk is minimum. */
3122 gp = g_new_geomf(mp, "%s", md->md_name);
3123 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO);
3124 gp->start = g_mirror_start;
3125 gp->orphan = g_mirror_orphan;
3126 gp->access = g_mirror_access;
3127 gp->dumpconf = g_mirror_dumpconf;
3130 sc->sc_id = md->md_mid;
3131 g_mirror_reinit_from_metadata(sc, md);
3132 sc->sc_sectorsize = md->md_sectorsize;
3135 sc->sc_last_write = time_uptime;
3138 sx_init(&sc->sc_lock, "gmirror:lock");
3139 TAILQ_INIT(&sc->sc_queue);
3140 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF);
3141 TAILQ_INIT(&sc->sc_regular_delayed);
3142 TAILQ_INIT(&sc->sc_inflight);
3143 TAILQ_INIT(&sc->sc_sync_delayed);
3144 LIST_INIT(&sc->sc_disks);
3145 TAILQ_INIT(&sc->sc_events);
3146 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF);
3147 callout_init(&sc->sc_callout, 1);
3148 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF);
3149 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING;
3152 sc->sc_provider = NULL;
3153 sc->sc_provider_open = 0;
3155 * Synchronization geom.
3157 gp = g_new_geomf(mp, "%s.sync", md->md_name);
3159 gp->orphan = g_mirror_orphan;
3160 sc->sc_sync.ds_geom = gp;
3161 sc->sc_sync.ds_ndisks = 0;
3162 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0,
3163 "g_mirror %s", md->md_name);
3165 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.",
3167 g_destroy_geom(sc->sc_sync.ds_geom);
3168 g_destroy_geom(sc->sc_geom);
3169 g_mirror_free_device(sc);
3173 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).",
3174 sc->sc_name, sc->sc_ndisks, sc->sc_id);
3176 sc->sc_rootmount = root_mount_hold("GMIRROR");
3177 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
3180 * Schedule startup timeout.
3182 timeout = g_mirror_timeout * hz;
3183 sc->sc_timeout_event = malloc(sizeof(struct g_mirror_event), M_MIRROR,
3185 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc);
3186 return (sc->sc_geom);
3190 g_mirror_destroy(struct g_mirror_softc *sc, int how)
3192 struct g_mirror_disk *disk;
3194 g_topology_assert_not();
3195 sx_assert(&sc->sc_lock, SX_XLOCKED);
3197 if (sc->sc_provider_open != 0) {
3199 case G_MIRROR_DESTROY_SOFT:
3201 "Device %s is still open (%d).", sc->sc_name,
3202 sc->sc_provider_open);
3204 case G_MIRROR_DESTROY_DELAYED:
3206 "Device %s will be destroyed on last close.",
3208 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
3209 if (disk->d_state ==
3210 G_MIRROR_DISK_STATE_SYNCHRONIZING) {
3211 g_mirror_sync_stop(disk, 1);
3214 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT;
3216 case G_MIRROR_DESTROY_HARD:
3217 G_MIRROR_DEBUG(1, "Device %s is still open, so it "
3218 "can't be definitely removed.", sc->sc_name);
3222 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
3223 sx_xunlock(&sc->sc_lock);
3226 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
3227 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN;
3228 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
3229 sx_xunlock(&sc->sc_lock);
3230 mtx_lock(&sc->sc_queue_mtx);
3232 mtx_unlock(&sc->sc_queue_mtx);
3233 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
3234 while (sc->sc_worker != NULL)
3235 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5);
3236 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
3237 sx_xlock(&sc->sc_lock);
3238 g_mirror_destroy_device(sc);
3243 g_mirror_taste_orphan(struct g_consumer *cp)
3246 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
3247 cp->provider->name));
3250 static struct g_geom *
3251 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
3253 struct g_mirror_metadata md;
3254 struct g_mirror_softc *sc;
3255 struct g_consumer *cp;
3259 g_topology_assert();
3260 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
3261 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name);
3263 gp = g_new_geomf(mp, "mirror:taste");
3265 * This orphan function should be never called.
3267 gp->orphan = g_mirror_taste_orphan;
3268 cp = g_new_consumer(gp);
3269 error = g_attach(cp, pp);
3271 error = g_mirror_read_metadata(cp, &md);
3274 g_destroy_consumer(cp);
3280 if (md.md_provider[0] != '\0' &&
3281 !g_compare_names(md.md_provider, pp->name))
3283 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
3285 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) {
3287 "Device %s: provider %s marked as inactive, skipping.",
3288 md.md_name, pp->name);
3291 if (g_mirror_debug >= 2)
3292 mirror_metadata_dump(&md);
3295 * Let's check if device already exists.
3298 LIST_FOREACH(gp, &mp->geom, geom) {
3302 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
3304 if (sc->sc_sync.ds_geom == gp)
3306 if (strcmp(md.md_name, sc->sc_name) != 0)
3308 if (md.md_mid != sc->sc_id) {
3309 G_MIRROR_DEBUG(0, "Device %s already configured.",
3316 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC);
3318 G_MIRROR_DEBUG(0, "Cannot create device %s.",
3324 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
3325 g_topology_unlock();
3326 sx_xlock(&sc->sc_lock);
3327 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING;
3328 error = g_mirror_add_disk(sc, pp, &md);
3329 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING;
3331 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
3332 pp->name, gp->name, error);
3333 if (LIST_EMPTY(&sc->sc_disks)) {
3335 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
3341 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
3342 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
3346 sx_xunlock(&sc->sc_lock);
3352 g_mirror_resize(struct g_consumer *cp)
3354 struct g_mirror_disk *disk;
3356 g_topology_assert();
3357 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name);
3362 g_topology_unlock();
3363 g_mirror_update_metadata(disk);
3368 g_mirror_destroy_geom(struct gctl_req *req __unused,
3369 struct g_class *mp __unused, struct g_geom *gp)
3371 struct g_mirror_softc *sc;
3374 g_topology_unlock();
3376 sx_xlock(&sc->sc_lock);
3378 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT);
3380 sx_xunlock(&sc->sc_lock);
3386 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
3387 struct g_consumer *cp, struct g_provider *pp)
3389 struct g_mirror_softc *sc;
3391 g_topology_assert();
3396 /* Skip synchronization geom. */
3397 if (gp == sc->sc_sync.ds_geom)
3401 } else if (cp != NULL) {
3402 struct g_mirror_disk *disk;
3407 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id);
3408 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
3409 sbuf_printf(sb, "%s<Synchronized>", indent);
3410 if (disk->d_sync.ds_offset == 0)
3413 sbuf_printf(sb, "%u%%",
3414 (u_int)((disk->d_sync.ds_offset * 100) /
3416 sbuf_cat(sb, "</Synchronized>\n");
3417 if (disk->d_sync.ds_offset > 0)
3418 sbuf_printf(sb, "%s<BytesSynced>%jd"
3419 "</BytesSynced>\n", indent,
3420 (intmax_t)disk->d_sync.ds_offset);
3422 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
3423 disk->d_sync.ds_syncid);
3424 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent,
3426 sbuf_printf(sb, "%s<Flags>", indent);
3427 if (disk->d_flags == 0)
3428 sbuf_cat(sb, "NONE");
3432 #define ADD_FLAG(flag, name) do { \
3433 if ((disk->d_flags & (flag)) != 0) { \
3435 sbuf_cat(sb, ", "); \
3438 sbuf_cat(sb, name); \
3441 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY");
3442 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED");
3443 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE");
3444 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING,
3446 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
3447 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN");
3450 sbuf_cat(sb, "</Flags>\n");
3451 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent,
3453 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3454 g_mirror_disk_state2str(disk->d_state));
3456 sbuf_printf(sb, "%s<Type>", indent);
3457 switch (sc->sc_type) {
3458 case G_MIRROR_TYPE_AUTOMATIC:
3459 sbuf_cat(sb, "AUTOMATIC");
3461 case G_MIRROR_TYPE_MANUAL:
3462 sbuf_cat(sb, "MANUAL");
3465 sbuf_cat(sb, "UNKNOWN");
3468 sbuf_cat(sb, "</Type>\n");
3469 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
3470 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
3471 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
3472 sbuf_printf(sb, "%s<Flags>", indent);
3473 if (sc->sc_flags == 0)
3474 sbuf_cat(sb, "NONE");
3478 #define ADD_FLAG(flag, name) do { \
3479 if ((sc->sc_flags & (flag)) != 0) { \
3481 sbuf_cat(sb, ", "); \
3484 sbuf_cat(sb, name); \
3487 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC");
3488 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
3491 sbuf_cat(sb, "</Flags>\n");
3492 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent,
3493 (u_int)sc->sc_slice);
3494 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent,
3495 balance_name(sc->sc_balance));
3496 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
3498 sbuf_printf(sb, "%s<State>", indent);
3499 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
3500 sbuf_printf(sb, "%s", "STARTING");
3501 else if (sc->sc_ndisks ==
3502 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE))
3503 sbuf_printf(sb, "%s", "COMPLETE");
3505 sbuf_printf(sb, "%s", "DEGRADED");
3506 sbuf_cat(sb, "</State>\n");
3511 g_mirror_shutdown_post_sync(void *arg, int howto)
3514 struct g_geom *gp, *gp2;
3515 struct g_mirror_softc *sc;
3518 if (KERNEL_PANICKED())
3523 g_mirror_shutdown = 1;
3524 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
3525 if ((sc = gp->softc) == NULL)
3527 /* Skip synchronization geom. */
3528 if (gp == sc->sc_sync.ds_geom)
3530 g_topology_unlock();
3531 sx_xlock(&sc->sc_lock);
3532 g_mirror_idle(sc, -1);
3534 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED);
3536 sx_xunlock(&sc->sc_lock);
3539 g_topology_unlock();
3543 g_mirror_init(struct g_class *mp)
3546 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync,
3547 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST);
3548 if (g_mirror_post_sync == NULL)
3549 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event.");
3553 g_mirror_fini(struct g_class *mp)
3556 if (g_mirror_post_sync != NULL)
3557 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync);
3561 * Refresh the mirror device's metadata when gmirror encounters a newer
3562 * generation as the individual components are being added to the mirror set.
3565 g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp,
3566 const struct g_mirror_metadata *md)
3569 g_topology_assert_not();
3570 sx_assert(&sc->sc_lock, SX_XLOCKED);
3572 KASSERT(sc->sc_genid <= md->md_genid,
3573 ("%s: attempted to refresh from stale component %s (device %s) "
3574 "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid,
3577 if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid &&
3578 sc->sc_syncid >= md->md_syncid))
3581 G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u "
3582 "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; "
3583 "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid,
3584 sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name);
3586 if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) {
3587 /* Probable data corruption detected */
3588 G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state "
3589 "(device=%s genid=%u). A stale mirror device was launched.",
3590 g_mirror_device_state2str(sc->sc_state), sc->sc_name,
3596 g_mirror_reinit_from_metadata(sc, md);
3598 G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s "
3599 "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid,
3600 g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid,
3601 md->md_syncid, (unsigned)md->md_all);
3606 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror);
3607 MODULE_VERSION(geom_mirror, 0);