2 * Copyright (c) 2004-2006 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>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/limits.h>
37 #include <sys/mutex.h>
40 #include <sys/sysctl.h>
41 #include <sys/malloc.h>
42 #include <sys/eventhandler.h>
44 #include <geom/geom.h>
46 #include <sys/kthread.h>
47 #include <sys/sched.h>
48 #include <geom/mirror/g_mirror.h>
50 FEATURE(geom_mirror, "GEOM mirroring support");
52 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data");
54 SYSCTL_DECL(_kern_geom);
55 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0,
57 u_int g_mirror_debug = 0;
58 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0,
60 static u_int g_mirror_timeout = 4;
61 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout,
62 0, "Time to wait on all mirror components");
63 static u_int g_mirror_idletime = 5;
64 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN,
65 &g_mirror_idletime, 0, "Mark components as clean when idling");
66 static u_int g_mirror_disconnect_on_failure = 1;
67 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN,
68 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure.");
69 static u_int g_mirror_syncreqs = 2;
70 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN,
71 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests.");
73 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
74 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
75 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
76 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
79 static eventhandler_tag g_mirror_post_sync = NULL;
80 static int g_mirror_shutdown = 0;
82 static g_ctl_destroy_geom_t g_mirror_destroy_geom;
83 static g_taste_t g_mirror_taste;
84 static g_init_t g_mirror_init;
85 static g_fini_t g_mirror_fini;
86 static g_provgone_t g_mirror_providergone;
87 static g_resize_t g_mirror_resize;
89 struct g_class g_mirror_class = {
90 .name = G_MIRROR_CLASS_NAME,
92 .ctlreq = g_mirror_config,
93 .taste = g_mirror_taste,
94 .destroy_geom = g_mirror_destroy_geom,
95 .init = g_mirror_init,
96 .fini = g_mirror_fini,
97 .providergone = g_mirror_providergone,
98 .resize = g_mirror_resize
102 static void g_mirror_destroy_provider(struct g_mirror_softc *sc);
103 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state);
104 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force);
105 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent,
106 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
107 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type);
108 static void g_mirror_register_request(struct bio *bp);
109 static void g_mirror_sync_release(struct g_mirror_softc *sc);
113 g_mirror_disk_state2str(int state)
117 case G_MIRROR_DISK_STATE_NONE:
119 case G_MIRROR_DISK_STATE_NEW:
121 case G_MIRROR_DISK_STATE_ACTIVE:
123 case G_MIRROR_DISK_STATE_STALE:
125 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
126 return ("SYNCHRONIZING");
127 case G_MIRROR_DISK_STATE_DISCONNECTED:
128 return ("DISCONNECTED");
129 case G_MIRROR_DISK_STATE_DESTROY:
137 g_mirror_device_state2str(int state)
141 case G_MIRROR_DEVICE_STATE_STARTING:
143 case G_MIRROR_DEVICE_STATE_RUNNING:
151 g_mirror_get_diskname(struct g_mirror_disk *disk)
154 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
155 return ("[unknown]");
156 return (disk->d_name);
160 * --- Events handling functions ---
161 * Events in geom_mirror are used to maintain disks and device status
162 * from one thread to simplify locking.
165 g_mirror_event_free(struct g_mirror_event *ep)
172 g_mirror_event_send(void *arg, int state, int flags)
174 struct g_mirror_softc *sc;
175 struct g_mirror_disk *disk;
176 struct g_mirror_event *ep;
179 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK);
180 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep);
181 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) {
192 mtx_lock(&sc->sc_events_mtx);
193 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
194 mtx_unlock(&sc->sc_events_mtx);
195 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
196 mtx_lock(&sc->sc_queue_mtx);
198 mtx_unlock(&sc->sc_queue_mtx);
199 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0)
201 sx_assert(&sc->sc_lock, SX_XLOCKED);
202 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
203 sx_xunlock(&sc->sc_lock);
204 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) {
205 mtx_lock(&sc->sc_events_mtx);
206 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event",
210 g_mirror_event_free(ep);
211 sx_xlock(&sc->sc_lock);
215 static struct g_mirror_event *
216 g_mirror_event_get(struct g_mirror_softc *sc)
218 struct g_mirror_event *ep;
220 mtx_lock(&sc->sc_events_mtx);
221 ep = TAILQ_FIRST(&sc->sc_events);
222 mtx_unlock(&sc->sc_events_mtx);
227 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep)
230 mtx_lock(&sc->sc_events_mtx);
231 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
232 mtx_unlock(&sc->sc_events_mtx);
236 g_mirror_event_cancel(struct g_mirror_disk *disk)
238 struct g_mirror_softc *sc;
239 struct g_mirror_event *ep, *tmpep;
242 sx_assert(&sc->sc_lock, SX_XLOCKED);
244 mtx_lock(&sc->sc_events_mtx);
245 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
246 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0)
248 if (ep->e_disk != disk)
250 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
251 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
252 g_mirror_event_free(ep);
254 ep->e_error = ECANCELED;
258 mtx_unlock(&sc->sc_events_mtx);
262 * Return the number of disks in given state.
263 * If state is equal to -1, count all connected disks.
266 g_mirror_ndisks(struct g_mirror_softc *sc, int state)
268 struct g_mirror_disk *disk;
271 sx_assert(&sc->sc_lock, SX_LOCKED);
273 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
274 if (state == -1 || disk->d_state == state)
281 * Find a disk in mirror by its disk ID.
283 static struct g_mirror_disk *
284 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id)
286 struct g_mirror_disk *disk;
288 sx_assert(&sc->sc_lock, SX_XLOCKED);
290 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
291 if (disk->d_id == id)
298 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp)
303 mtx_lock(&sc->sc_queue_mtx);
304 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
305 if (bp->bio_from == cp)
308 mtx_unlock(&sc->sc_queue_mtx);
313 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp)
318 "I/O requests for %s exist, can't destroy it now.",
322 if (g_mirror_nrequests(sc, cp) > 0) {
324 "I/O requests for %s in queue, can't destroy it now.",
332 g_mirror_destroy_consumer(void *arg, int flags __unused)
334 struct g_consumer *cp;
339 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
341 g_destroy_consumer(cp);
345 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
347 struct g_provider *pp;
353 if (g_mirror_is_busy(sc, cp))
358 if ((pp->geom->flags & G_GEOM_WITHER) == 0)
361 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
362 -cp->acw, -cp->ace, 0);
363 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
364 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
367 * After retaste event was send (inside g_access()), we can send
368 * event to detach and destroy consumer.
369 * A class, which has consumer to the given provider connected
370 * will not receive retaste event for the provider.
371 * This is the way how I ignore retaste events when I close
372 * consumers opened for write: I detach and destroy consumer
373 * after retaste event is sent.
375 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL);
378 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name);
380 g_destroy_consumer(cp);
384 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp)
386 struct g_consumer *cp;
389 g_topology_assert_not();
390 KASSERT(disk->d_consumer == NULL,
391 ("Disk already connected (device %s).", disk->d_softc->sc_name));
394 cp = g_new_consumer(disk->d_softc->sc_geom);
395 cp->flags |= G_CF_DIRECT_RECEIVE;
396 error = g_attach(cp, pp);
398 g_destroy_consumer(cp);
402 error = g_access(cp, 1, 1, 1);
405 g_destroy_consumer(cp);
407 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).",
412 disk->d_consumer = cp;
413 disk->d_consumer->private = disk;
414 disk->d_consumer->index = 0;
416 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk));
421 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
428 if (cp->provider != NULL)
429 g_mirror_kill_consumer(sc, cp);
431 g_destroy_consumer(cp);
435 * Initialize disk. This means allocate memory, create consumer, attach it
436 * to the provider and open access (r1w1e1) to it.
438 static struct g_mirror_disk *
439 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp,
440 struct g_mirror_metadata *md, int *errorp)
442 struct g_mirror_disk *disk;
445 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO);
451 error = g_mirror_connect_disk(disk, pp);
454 disk->d_id = md->md_did;
455 disk->d_state = G_MIRROR_DISK_STATE_NONE;
456 disk->d_priority = md->md_priority;
457 disk->d_flags = md->md_dflags;
458 error = g_getattr("GEOM::candelete", disk->d_consumer, &i);
459 if (error == 0 && i != 0)
460 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE;
461 if (md->md_provider[0] != '\0')
462 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED;
463 disk->d_sync.ds_consumer = NULL;
464 disk->d_sync.ds_offset = md->md_sync_offset;
465 disk->d_sync.ds_offset_done = md->md_sync_offset;
466 disk->d_genid = md->md_genid;
467 disk->d_sync.ds_syncid = md->md_syncid;
475 free(disk, M_MIRROR);
480 g_mirror_destroy_disk(struct g_mirror_disk *disk)
482 struct g_mirror_softc *sc;
484 g_topology_assert_not();
486 sx_assert(&sc->sc_lock, SX_XLOCKED);
488 LIST_REMOVE(disk, d_next);
489 g_mirror_event_cancel(disk);
490 if (sc->sc_hint == disk)
492 switch (disk->d_state) {
493 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
494 g_mirror_sync_stop(disk, 1);
496 case G_MIRROR_DISK_STATE_NEW:
497 case G_MIRROR_DISK_STATE_STALE:
498 case G_MIRROR_DISK_STATE_ACTIVE:
500 g_mirror_disconnect_consumer(sc, disk->d_consumer);
502 free(disk, M_MIRROR);
505 KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
506 g_mirror_get_diskname(disk),
507 g_mirror_disk_state2str(disk->d_state)));
512 g_mirror_free_device(struct g_mirror_softc *sc)
515 mtx_destroy(&sc->sc_queue_mtx);
516 mtx_destroy(&sc->sc_events_mtx);
517 mtx_destroy(&sc->sc_done_mtx);
518 sx_destroy(&sc->sc_lock);
523 g_mirror_providergone(struct g_provider *pp)
525 struct g_mirror_softc *sc = pp->private;
527 if ((--sc->sc_refcnt) == 0)
528 g_mirror_free_device(sc);
532 g_mirror_destroy_device(struct g_mirror_softc *sc)
534 struct g_mirror_disk *disk;
535 struct g_mirror_event *ep;
537 struct g_consumer *cp, *tmpcp;
539 g_topology_assert_not();
540 sx_assert(&sc->sc_lock, SX_XLOCKED);
543 if (sc->sc_provider != NULL)
544 g_mirror_destroy_provider(sc);
545 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL;
546 disk = LIST_FIRST(&sc->sc_disks)) {
547 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
548 g_mirror_update_metadata(disk);
549 g_mirror_destroy_disk(disk);
551 while ((ep = g_mirror_event_get(sc)) != NULL) {
552 g_mirror_event_remove(sc, ep);
553 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
554 g_mirror_event_free(ep);
556 ep->e_error = ECANCELED;
557 ep->e_flags |= G_MIRROR_EVENT_DONE;
558 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep);
559 mtx_lock(&sc->sc_events_mtx);
561 mtx_unlock(&sc->sc_events_mtx);
564 callout_drain(&sc->sc_callout);
567 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) {
568 g_mirror_disconnect_consumer(sc, cp);
570 g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
571 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name);
572 g_wither_geom(gp, ENXIO);
573 sx_xunlock(&sc->sc_lock);
574 if ((--sc->sc_refcnt) == 0)
575 g_mirror_free_device(sc);
580 g_mirror_orphan(struct g_consumer *cp)
582 struct g_mirror_disk *disk;
589 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
590 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
591 G_MIRROR_EVENT_DONTWAIT);
595 * Function should return the next active disk on the list.
596 * It is possible that it will be the same disk as given.
597 * If there are no active disks on list, NULL is returned.
599 static __inline struct g_mirror_disk *
600 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
602 struct g_mirror_disk *dp;
604 for (dp = LIST_NEXT(disk, d_next); dp != disk;
605 dp = LIST_NEXT(dp, d_next)) {
607 dp = LIST_FIRST(&sc->sc_disks);
608 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE)
611 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
616 static struct g_mirror_disk *
617 g_mirror_get_disk(struct g_mirror_softc *sc)
619 struct g_mirror_disk *disk;
621 if (sc->sc_hint == NULL) {
622 sc->sc_hint = LIST_FIRST(&sc->sc_disks);
623 if (sc->sc_hint == NULL)
627 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) {
628 disk = g_mirror_find_next(sc, disk);
632 sc->sc_hint = g_mirror_find_next(sc, disk);
637 g_mirror_write_metadata(struct g_mirror_disk *disk,
638 struct g_mirror_metadata *md)
640 struct g_mirror_softc *sc;
641 struct g_consumer *cp;
642 off_t offset, length;
646 g_topology_assert_not();
648 sx_assert(&sc->sc_lock, SX_LOCKED);
650 cp = disk->d_consumer;
651 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
652 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
653 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
654 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
656 length = cp->provider->sectorsize;
657 offset = cp->provider->mediasize - length;
658 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO);
660 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) {
662 * Handle the case, when the size of parent provider reduced.
664 if (offset < md->md_mediasize)
667 mirror_metadata_encode(md, sector);
669 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error);
671 error = g_write_data(cp, offset, sector, length);
672 free(sector, M_MIRROR);
674 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
675 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
676 G_MIRROR_DEBUG(0, "Cannot write metadata on %s "
677 "(device=%s, error=%d).",
678 g_mirror_get_diskname(disk), sc->sc_name, error);
680 G_MIRROR_DEBUG(1, "Cannot write metadata on %s "
681 "(device=%s, error=%d).",
682 g_mirror_get_diskname(disk), sc->sc_name, error);
684 if (g_mirror_disconnect_on_failure &&
685 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) {
686 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
687 g_mirror_event_send(disk,
688 G_MIRROR_DISK_STATE_DISCONNECTED,
689 G_MIRROR_EVENT_DONTWAIT);
696 g_mirror_clear_metadata(struct g_mirror_disk *disk)
700 g_topology_assert_not();
701 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED);
703 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
705 error = g_mirror_write_metadata(disk, NULL);
707 G_MIRROR_DEBUG(2, "Metadata on %s cleared.",
708 g_mirror_get_diskname(disk));
711 "Cannot clear metadata on disk %s (error=%d).",
712 g_mirror_get_diskname(disk), error);
718 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk,
719 struct g_mirror_metadata *md)
722 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic));
723 md->md_version = G_MIRROR_VERSION;
724 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
725 md->md_mid = sc->sc_id;
726 md->md_all = sc->sc_ndisks;
727 md->md_slice = sc->sc_slice;
728 md->md_balance = sc->sc_balance;
729 md->md_genid = sc->sc_genid;
730 md->md_mediasize = sc->sc_mediasize;
731 md->md_sectorsize = sc->sc_sectorsize;
732 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK);
733 bzero(md->md_provider, sizeof(md->md_provider));
735 md->md_did = arc4random();
739 md->md_sync_offset = 0;
742 md->md_did = disk->d_id;
743 md->md_priority = disk->d_priority;
744 md->md_syncid = disk->d_sync.ds_syncid;
745 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK);
746 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
747 md->md_sync_offset = disk->d_sync.ds_offset_done;
749 md->md_sync_offset = 0;
750 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) {
751 strlcpy(md->md_provider,
752 disk->d_consumer->provider->name,
753 sizeof(md->md_provider));
755 md->md_provsize = disk->d_consumer->provider->mediasize;
760 g_mirror_update_metadata(struct g_mirror_disk *disk)
762 struct g_mirror_softc *sc;
763 struct g_mirror_metadata md;
766 g_topology_assert_not();
768 sx_assert(&sc->sc_lock, SX_LOCKED);
770 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
772 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0)
773 g_mirror_fill_metadata(sc, disk, &md);
774 error = g_mirror_write_metadata(disk, &md);
776 G_MIRROR_DEBUG(2, "Metadata on %s updated.",
777 g_mirror_get_diskname(disk));
780 "Cannot update metadata on disk %s (error=%d).",
781 g_mirror_get_diskname(disk), error);
786 g_mirror_bump_syncid(struct g_mirror_softc *sc)
788 struct g_mirror_disk *disk;
790 g_topology_assert_not();
791 sx_assert(&sc->sc_lock, SX_XLOCKED);
792 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
793 ("%s called with no active disks (device=%s).", __func__,
797 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
799 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
800 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
801 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
802 disk->d_sync.ds_syncid = sc->sc_syncid;
803 g_mirror_update_metadata(disk);
809 g_mirror_bump_genid(struct g_mirror_softc *sc)
811 struct g_mirror_disk *disk;
813 g_topology_assert_not();
814 sx_assert(&sc->sc_lock, SX_XLOCKED);
815 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
816 ("%s called with no active disks (device=%s).", __func__,
820 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
822 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
823 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
824 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
825 disk->d_genid = sc->sc_genid;
826 g_mirror_update_metadata(disk);
832 g_mirror_idle(struct g_mirror_softc *sc, int acw)
834 struct g_mirror_disk *disk;
837 g_topology_assert_not();
838 sx_assert(&sc->sc_lock, SX_XLOCKED);
840 if (sc->sc_provider == NULL)
842 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
846 if (sc->sc_writes > 0)
848 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) {
849 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write);
850 if (!g_mirror_shutdown && timeout > 0)
854 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
855 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
857 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.",
858 g_mirror_get_diskname(disk), sc->sc_name);
859 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
860 g_mirror_update_metadata(disk);
866 g_mirror_unidle(struct g_mirror_softc *sc)
868 struct g_mirror_disk *disk;
870 g_topology_assert_not();
871 sx_assert(&sc->sc_lock, SX_XLOCKED);
873 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
876 sc->sc_last_write = time_uptime;
877 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
878 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
880 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.",
881 g_mirror_get_diskname(disk), sc->sc_name);
882 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
883 g_mirror_update_metadata(disk);
888 g_mirror_flush_done(struct bio *bp)
890 struct g_mirror_softc *sc;
893 pbp = bp->bio_parent;
894 sc = pbp->bio_to->private;
895 mtx_lock(&sc->sc_done_mtx);
896 if (pbp->bio_error == 0)
897 pbp->bio_error = bp->bio_error;
898 pbp->bio_completed += bp->bio_completed;
900 if (pbp->bio_children == pbp->bio_inbed) {
901 mtx_unlock(&sc->sc_done_mtx);
902 g_io_deliver(pbp, pbp->bio_error);
904 mtx_unlock(&sc->sc_done_mtx);
909 g_mirror_done(struct bio *bp)
911 struct g_mirror_softc *sc;
913 sc = bp->bio_from->geom->softc;
914 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR;
915 mtx_lock(&sc->sc_queue_mtx);
916 bioq_insert_tail(&sc->sc_queue, bp);
917 mtx_unlock(&sc->sc_queue_mtx);
922 g_mirror_regular_request(struct bio *bp)
924 struct g_mirror_softc *sc;
925 struct g_mirror_disk *disk;
928 g_topology_assert_not();
930 pbp = bp->bio_parent;
931 sc = pbp->bio_to->private;
932 bp->bio_from->index--;
933 if (bp->bio_cmd == BIO_WRITE)
935 disk = bp->bio_from->private;
938 g_mirror_kill_consumer(sc, bp->bio_from);
942 if (bp->bio_cmd == BIO_READ)
943 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read,
945 else if (bp->bio_cmd == BIO_WRITE)
946 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write,
950 KASSERT(pbp->bio_inbed <= pbp->bio_children,
951 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
953 if (bp->bio_error == 0 && pbp->bio_error == 0) {
954 G_MIRROR_LOGREQ(3, bp, "Request delivered.");
956 if (pbp->bio_children == pbp->bio_inbed) {
957 G_MIRROR_LOGREQ(3, pbp, "Request delivered.");
958 pbp->bio_completed = pbp->bio_length;
959 if (pbp->bio_cmd == BIO_WRITE ||
960 pbp->bio_cmd == BIO_DELETE) {
961 bioq_remove(&sc->sc_inflight, pbp);
962 /* Release delayed sync requests if possible. */
963 g_mirror_sync_release(sc);
965 g_io_deliver(pbp, pbp->bio_error);
968 } else if (bp->bio_error != 0) {
969 if (pbp->bio_error == 0)
970 pbp->bio_error = bp->bio_error;
972 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
973 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
974 G_MIRROR_LOGREQ(0, bp,
975 "Request failed (error=%d).",
978 G_MIRROR_LOGREQ(1, bp,
979 "Request failed (error=%d).",
982 if (g_mirror_disconnect_on_failure &&
983 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1)
985 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
986 g_mirror_event_send(disk,
987 G_MIRROR_DISK_STATE_DISCONNECTED,
988 G_MIRROR_EVENT_DONTWAIT);
991 switch (pbp->bio_cmd) {
1001 switch (pbp->bio_cmd) {
1003 if (pbp->bio_inbed < pbp->bio_children)
1005 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1)
1006 g_io_deliver(pbp, pbp->bio_error);
1009 mtx_lock(&sc->sc_queue_mtx);
1010 bioq_insert_tail(&sc->sc_queue, pbp);
1011 mtx_unlock(&sc->sc_queue_mtx);
1012 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1018 if (pbp->bio_children == 0) {
1020 * All requests failed.
1022 } else if (pbp->bio_inbed < pbp->bio_children) {
1025 } else if (pbp->bio_children == pbp->bio_inbed) {
1026 /* Some requests succeeded. */
1028 pbp->bio_completed = pbp->bio_length;
1030 bioq_remove(&sc->sc_inflight, pbp);
1031 /* Release delayed sync requests if possible. */
1032 g_mirror_sync_release(sc);
1033 g_io_deliver(pbp, pbp->bio_error);
1036 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd));
1042 g_mirror_sync_done(struct bio *bp)
1044 struct g_mirror_softc *sc;
1046 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered.");
1047 sc = bp->bio_from->geom->softc;
1048 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC;
1049 mtx_lock(&sc->sc_queue_mtx);
1050 bioq_insert_tail(&sc->sc_queue, bp);
1051 mtx_unlock(&sc->sc_queue_mtx);
1056 g_mirror_candelete(struct bio *bp)
1058 struct g_mirror_softc *sc;
1059 struct g_mirror_disk *disk;
1062 sc = bp->bio_to->private;
1063 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1064 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE)
1067 val = (int *)bp->bio_data;
1068 *val = (disk != NULL);
1069 g_io_deliver(bp, 0);
1073 g_mirror_kernel_dump(struct bio *bp)
1075 struct g_mirror_softc *sc;
1076 struct g_mirror_disk *disk;
1078 struct g_kerneldump *gkd;
1081 * We configure dumping to the first component, because this component
1082 * will be used for reading with 'prefer' balance algorithm.
1083 * If the component with the highest priority is currently disconnected
1084 * we will not be able to read the dump after the reboot if it will be
1085 * connected and synchronized later. Can we do something better?
1087 sc = bp->bio_to->private;
1088 disk = LIST_FIRST(&sc->sc_disks);
1090 gkd = (struct g_kerneldump *)bp->bio_data;
1091 if (gkd->length > bp->bio_to->mediasize)
1092 gkd->length = bp->bio_to->mediasize;
1093 cbp = g_clone_bio(bp);
1095 g_io_deliver(bp, ENOMEM);
1098 cbp->bio_done = g_std_done;
1099 g_io_request(cbp, disk->d_consumer);
1100 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.",
1101 g_mirror_get_diskname(disk));
1105 g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp)
1107 struct bio_queue_head queue;
1108 struct g_mirror_disk *disk;
1109 struct g_consumer *cp;
1113 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1114 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1116 cbp = g_clone_bio(bp);
1118 while ((cbp = bioq_takefirst(&queue)) != NULL)
1120 if (bp->bio_error == 0)
1121 bp->bio_error = ENOMEM;
1122 g_io_deliver(bp, bp->bio_error);
1125 bioq_insert_tail(&queue, cbp);
1126 cbp->bio_done = g_mirror_flush_done;
1127 cbp->bio_caller1 = disk;
1128 cbp->bio_to = disk->d_consumer->provider;
1130 while ((cbp = bioq_takefirst(&queue)) != NULL) {
1131 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1132 disk = cbp->bio_caller1;
1133 cbp->bio_caller1 = NULL;
1134 cp = disk->d_consumer;
1135 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1136 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1137 cp->acr, cp->acw, cp->ace));
1138 g_io_request(cbp, disk->d_consumer);
1143 g_mirror_start(struct bio *bp)
1145 struct g_mirror_softc *sc;
1147 sc = bp->bio_to->private;
1149 * If sc == NULL or there are no valid disks, provider's error
1150 * should be set and g_mirror_start() should not be called at all.
1152 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
1153 ("Provider's error should be set (error=%d)(mirror=%s).",
1154 bp->bio_to->error, bp->bio_to->name));
1155 G_MIRROR_LOGREQ(3, bp, "Request received.");
1157 switch (bp->bio_cmd) {
1163 g_mirror_flush(sc, bp);
1166 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) {
1167 g_mirror_candelete(bp);
1169 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
1170 g_mirror_kernel_dump(bp);
1175 g_io_deliver(bp, EOPNOTSUPP);
1178 mtx_lock(&sc->sc_queue_mtx);
1179 bioq_insert_tail(&sc->sc_queue, bp);
1180 mtx_unlock(&sc->sc_queue_mtx);
1181 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1186 * Return TRUE if the given request is colliding with a in-progress
1187 * synchronization request.
1190 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp)
1192 struct g_mirror_disk *disk;
1194 off_t rstart, rend, sstart, send;
1197 if (sc->sc_sync.ds_ndisks == 0)
1199 rstart = bp->bio_offset;
1200 rend = bp->bio_offset + bp->bio_length;
1201 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1202 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING)
1204 for (i = 0; i < g_mirror_syncreqs; i++) {
1205 sbp = disk->d_sync.ds_bios[i];
1208 sstart = sbp->bio_offset;
1209 send = sbp->bio_offset + sbp->bio_length;
1210 if (rend > sstart && rstart < send)
1218 * Return TRUE if the given sync request is colliding with a in-progress regular
1222 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp)
1224 off_t rstart, rend, sstart, send;
1227 if (sc->sc_sync.ds_ndisks == 0)
1229 sstart = sbp->bio_offset;
1230 send = sbp->bio_offset + sbp->bio_length;
1231 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) {
1232 rstart = bp->bio_offset;
1233 rend = bp->bio_offset + bp->bio_length;
1234 if (rend > sstart && rstart < send)
1241 * Puts request onto delayed queue.
1244 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp)
1247 G_MIRROR_LOGREQ(2, bp, "Delaying request.");
1248 bioq_insert_head(&sc->sc_regular_delayed, bp);
1252 * Puts synchronization request onto delayed queue.
1255 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp)
1258 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request.");
1259 bioq_insert_tail(&sc->sc_sync_delayed, bp);
1263 * Releases delayed regular requests which don't collide anymore with sync
1267 g_mirror_regular_release(struct g_mirror_softc *sc)
1269 struct bio *bp, *bp2;
1271 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) {
1272 if (g_mirror_sync_collision(sc, bp))
1274 bioq_remove(&sc->sc_regular_delayed, bp);
1275 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp);
1276 mtx_lock(&sc->sc_queue_mtx);
1277 bioq_insert_head(&sc->sc_queue, bp);
1278 mtx_unlock(&sc->sc_queue_mtx);
1283 * Releases delayed sync requests which don't collide anymore with regular
1287 g_mirror_sync_release(struct g_mirror_softc *sc)
1289 struct bio *bp, *bp2;
1291 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) {
1292 if (g_mirror_regular_collision(sc, bp))
1294 bioq_remove(&sc->sc_sync_delayed, bp);
1295 G_MIRROR_LOGREQ(2, bp,
1296 "Releasing delayed synchronization request.");
1297 g_io_request(bp, bp->bio_from);
1302 * Free a synchronization request and clear its slot in the array.
1305 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp)
1309 if (disk != NULL && disk->d_sync.ds_bios != NULL) {
1310 i = (int)(uintptr_t)bp->bio_caller1;
1311 disk->d_sync.ds_bios[i] = NULL;
1313 free(bp->bio_data, M_MIRROR);
1318 * Handle synchronization requests.
1319 * Every synchronization request is two-steps process: first, READ request is
1320 * send to active provider and then WRITE request (with read data) to the provider
1321 * being synchronized. When WRITE is finished, new synchronization request is
1325 g_mirror_sync_request(struct bio *bp)
1327 struct g_mirror_softc *sc;
1328 struct g_mirror_disk *disk;
1329 struct g_mirror_disk_sync *sync;
1331 bp->bio_from->index--;
1332 sc = bp->bio_from->geom->softc;
1333 disk = bp->bio_from->private;
1335 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
1337 g_mirror_kill_consumer(sc, bp->bio_from);
1338 g_topology_unlock();
1339 g_mirror_sync_request_free(NULL, bp);
1340 sx_xlock(&sc->sc_lock);
1345 * Synchronization request.
1347 switch (bp->bio_cmd) {
1350 struct g_consumer *cp;
1352 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read,
1355 if (bp->bio_error != 0) {
1356 G_MIRROR_LOGREQ(0, bp,
1357 "Synchronization request failed (error=%d).",
1359 g_mirror_sync_request_free(disk, bp);
1362 G_MIRROR_LOGREQ(3, bp,
1363 "Synchronization request half-finished.");
1364 bp->bio_cmd = BIO_WRITE;
1366 cp = disk->d_consumer;
1367 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1368 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1369 cp->acr, cp->acw, cp->ace));
1371 g_io_request(bp, cp);
1380 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write,
1383 if (bp->bio_error != 0) {
1384 G_MIRROR_LOGREQ(0, bp,
1385 "Synchronization request failed (error=%d).",
1387 g_mirror_sync_request_free(disk, bp);
1388 sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
1389 g_mirror_event_send(disk,
1390 G_MIRROR_DISK_STATE_DISCONNECTED,
1391 G_MIRROR_EVENT_DONTWAIT);
1394 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished.");
1395 sync = &disk->d_sync;
1396 if (sync->ds_offset >= sc->sc_mediasize ||
1397 sync->ds_consumer == NULL ||
1398 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1399 /* Don't send more synchronization requests. */
1400 sync->ds_inflight--;
1401 g_mirror_sync_request_free(disk, bp);
1402 if (sync->ds_inflight > 0)
1404 if (sync->ds_consumer == NULL ||
1405 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1408 /* Disk up-to-date, activate it. */
1409 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE,
1410 G_MIRROR_EVENT_DONTWAIT);
1414 /* Send next synchronization request. */
1415 data = bp->bio_data;
1417 bp->bio_cmd = BIO_READ;
1418 bp->bio_offset = sync->ds_offset;
1419 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
1420 sync->ds_offset += bp->bio_length;
1421 bp->bio_done = g_mirror_sync_done;
1422 bp->bio_data = data;
1423 bp->bio_from = sync->ds_consumer;
1424 bp->bio_to = sc->sc_provider;
1425 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
1426 sync->ds_consumer->index++;
1428 * Delay the request if it is colliding with a regular request.
1430 if (g_mirror_regular_collision(sc, bp))
1431 g_mirror_sync_delay(sc, bp);
1433 g_io_request(bp, sync->ds_consumer);
1435 /* Release delayed requests if possible. */
1436 g_mirror_regular_release(sc);
1438 /* Find the smallest offset */
1439 offset = sc->sc_mediasize;
1440 for (i = 0; i < g_mirror_syncreqs; i++) {
1441 bp = sync->ds_bios[i];
1442 if (bp->bio_offset < offset)
1443 offset = bp->bio_offset;
1445 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) {
1446 /* Update offset_done on every 100 blocks. */
1447 sync->ds_offset_done = offset;
1448 g_mirror_update_metadata(disk);
1453 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1454 bp->bio_cmd, sc->sc_name));
1460 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp)
1462 struct g_mirror_disk *disk;
1463 struct g_consumer *cp;
1466 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1467 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE)
1471 if (bp->bio_error == 0)
1472 bp->bio_error = ENXIO;
1473 g_io_deliver(bp, bp->bio_error);
1476 cbp = g_clone_bio(bp);
1478 if (bp->bio_error == 0)
1479 bp->bio_error = ENOMEM;
1480 g_io_deliver(bp, bp->bio_error);
1484 * Fill in the component buf structure.
1486 cp = disk->d_consumer;
1487 cbp->bio_done = g_mirror_done;
1488 cbp->bio_to = cp->provider;
1489 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1490 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1491 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1494 g_io_request(cbp, cp);
1498 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp)
1500 struct g_mirror_disk *disk;
1501 struct g_consumer *cp;
1504 disk = g_mirror_get_disk(sc);
1506 if (bp->bio_error == 0)
1507 bp->bio_error = ENXIO;
1508 g_io_deliver(bp, bp->bio_error);
1511 cbp = g_clone_bio(bp);
1513 if (bp->bio_error == 0)
1514 bp->bio_error = ENOMEM;
1515 g_io_deliver(bp, bp->bio_error);
1519 * Fill in the component buf structure.
1521 cp = disk->d_consumer;
1522 cbp->bio_done = g_mirror_done;
1523 cbp->bio_to = cp->provider;
1524 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1525 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1526 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1529 g_io_request(cbp, cp);
1532 #define TRACK_SIZE (1 * 1024 * 1024)
1533 #define LOAD_SCALE 256
1534 #define ABS(x) (((x) >= 0) ? (x) : (-(x)))
1537 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp)
1539 struct g_mirror_disk *disk, *dp;
1540 struct g_consumer *cp;
1544 /* Find a disk with the smallest load. */
1547 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1548 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1551 /* If disk head is precisely in position - highly prefer it. */
1552 if (dp->d_last_offset == bp->bio_offset)
1553 prio -= 2 * LOAD_SCALE;
1555 /* If disk head is close to position - prefer it. */
1556 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE)
1557 prio -= 1 * LOAD_SCALE;
1563 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name));
1564 cbp = g_clone_bio(bp);
1566 if (bp->bio_error == 0)
1567 bp->bio_error = ENOMEM;
1568 g_io_deliver(bp, bp->bio_error);
1572 * Fill in the component buf structure.
1574 cp = disk->d_consumer;
1575 cbp->bio_done = g_mirror_done;
1576 cbp->bio_to = cp->provider;
1577 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1578 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1579 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1582 /* Remember last head position */
1583 disk->d_last_offset = bp->bio_offset + bp->bio_length;
1585 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1586 dp->load = (dp->d_consumer->index * LOAD_SCALE +
1589 g_io_request(cbp, cp);
1593 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp)
1595 struct bio_queue_head queue;
1596 struct g_mirror_disk *disk;
1597 struct g_consumer *cp;
1599 off_t left, mod, offset, slice;
1603 if (bp->bio_length <= sc->sc_slice) {
1604 g_mirror_request_round_robin(sc, bp);
1607 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE);
1608 slice = bp->bio_length / ndisks;
1609 mod = slice % sc->sc_provider->sectorsize;
1611 slice += sc->sc_provider->sectorsize - mod;
1613 * Allocate all bios before sending any request, so we can
1614 * return ENOMEM in nice and clean way.
1616 left = bp->bio_length;
1617 offset = bp->bio_offset;
1618 data = bp->bio_data;
1620 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1621 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1623 cbp = g_clone_bio(bp);
1625 while ((cbp = bioq_takefirst(&queue)) != NULL)
1627 if (bp->bio_error == 0)
1628 bp->bio_error = ENOMEM;
1629 g_io_deliver(bp, bp->bio_error);
1632 bioq_insert_tail(&queue, cbp);
1633 cbp->bio_done = g_mirror_done;
1634 cbp->bio_caller1 = disk;
1635 cbp->bio_to = disk->d_consumer->provider;
1636 cbp->bio_offset = offset;
1637 cbp->bio_data = data;
1638 cbp->bio_length = MIN(left, slice);
1639 left -= cbp->bio_length;
1642 offset += cbp->bio_length;
1643 data += cbp->bio_length;
1645 while ((cbp = bioq_takefirst(&queue)) != NULL) {
1646 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1647 disk = cbp->bio_caller1;
1648 cbp->bio_caller1 = NULL;
1649 cp = disk->d_consumer;
1650 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1651 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1652 cp->acr, cp->acw, cp->ace));
1653 disk->d_consumer->index++;
1654 g_io_request(cbp, disk->d_consumer);
1659 g_mirror_register_request(struct bio *bp)
1661 struct g_mirror_softc *sc;
1663 sc = bp->bio_to->private;
1664 switch (bp->bio_cmd) {
1666 switch (sc->sc_balance) {
1667 case G_MIRROR_BALANCE_LOAD:
1668 g_mirror_request_load(sc, bp);
1670 case G_MIRROR_BALANCE_PREFER:
1671 g_mirror_request_prefer(sc, bp);
1673 case G_MIRROR_BALANCE_ROUND_ROBIN:
1674 g_mirror_request_round_robin(sc, bp);
1676 case G_MIRROR_BALANCE_SPLIT:
1677 g_mirror_request_split(sc, bp);
1684 struct g_mirror_disk *disk;
1685 struct g_mirror_disk_sync *sync;
1686 struct bio_queue_head queue;
1687 struct g_consumer *cp;
1691 * Delay the request if it is colliding with a synchronization
1694 if (g_mirror_sync_collision(sc, bp)) {
1695 g_mirror_regular_delay(sc, bp);
1700 g_mirror_unidle(sc);
1702 sc->sc_last_write = time_uptime;
1705 * Bump syncid on first write.
1707 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) {
1708 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
1709 g_mirror_bump_syncid(sc);
1713 * Allocate all bios before sending any request, so we can
1714 * return ENOMEM in nice and clean way.
1717 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1718 sync = &disk->d_sync;
1719 switch (disk->d_state) {
1720 case G_MIRROR_DISK_STATE_ACTIVE:
1722 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
1723 if (bp->bio_offset >= sync->ds_offset)
1729 if (bp->bio_cmd == BIO_DELETE &&
1730 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0)
1732 cbp = g_clone_bio(bp);
1734 while ((cbp = bioq_takefirst(&queue)) != NULL)
1736 if (bp->bio_error == 0)
1737 bp->bio_error = ENOMEM;
1738 g_io_deliver(bp, bp->bio_error);
1741 bioq_insert_tail(&queue, cbp);
1742 cbp->bio_done = g_mirror_done;
1743 cp = disk->d_consumer;
1744 cbp->bio_caller1 = cp;
1745 cbp->bio_to = cp->provider;
1746 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1747 ("Consumer %s not opened (r%dw%de%d).",
1748 cp->provider->name, cp->acr, cp->acw, cp->ace));
1750 if (bioq_first(&queue) == NULL) {
1751 g_io_deliver(bp, EOPNOTSUPP);
1754 while ((cbp = bioq_takefirst(&queue)) != NULL) {
1755 G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1756 cp = cbp->bio_caller1;
1757 cbp->bio_caller1 = NULL;
1760 g_io_request(cbp, cp);
1763 * Put request onto inflight queue, so we can check if new
1764 * synchronization requests don't collide with it.
1766 bioq_insert_tail(&sc->sc_inflight, bp);
1770 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1771 bp->bio_cmd, sc->sc_name));
1777 g_mirror_can_destroy(struct g_mirror_softc *sc)
1780 struct g_consumer *cp;
1782 g_topology_assert();
1784 if (gp->softc == NULL)
1786 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0)
1788 LIST_FOREACH(cp, &gp->consumer, consumer) {
1789 if (g_mirror_is_busy(sc, cp))
1792 gp = sc->sc_sync.ds_geom;
1793 LIST_FOREACH(cp, &gp->consumer, consumer) {
1794 if (g_mirror_is_busy(sc, cp))
1797 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
1803 g_mirror_try_destroy(struct g_mirror_softc *sc)
1806 if (sc->sc_rootmount != NULL) {
1807 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
1809 root_mount_rel(sc->sc_rootmount);
1810 sc->sc_rootmount = NULL;
1813 if (!g_mirror_can_destroy(sc)) {
1814 g_topology_unlock();
1817 sc->sc_geom->softc = NULL;
1818 sc->sc_sync.ds_geom->softc = NULL;
1819 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) {
1820 g_topology_unlock();
1821 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1823 /* Unlock sc_lock here, as it can be destroyed after wakeup. */
1824 sx_xunlock(&sc->sc_lock);
1825 wakeup(&sc->sc_worker);
1826 sc->sc_worker = NULL;
1828 g_topology_unlock();
1829 g_mirror_destroy_device(sc);
1838 g_mirror_worker(void *arg)
1840 struct g_mirror_softc *sc;
1841 struct g_mirror_event *ep;
1846 thread_lock(curthread);
1847 sched_prio(curthread, PRIBIO);
1848 thread_unlock(curthread);
1850 sx_xlock(&sc->sc_lock);
1852 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__);
1854 * First take a look at events.
1855 * This is important to handle events before any I/O requests.
1857 ep = g_mirror_event_get(sc);
1859 g_mirror_event_remove(sc, ep);
1860 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) {
1861 /* Update only device status. */
1863 "Running event for device %s.",
1866 g_mirror_update_device(sc, true);
1868 /* Update disk status. */
1869 G_MIRROR_DEBUG(3, "Running event for disk %s.",
1870 g_mirror_get_diskname(ep->e_disk));
1871 ep->e_error = g_mirror_update_disk(ep->e_disk,
1873 if (ep->e_error == 0)
1874 g_mirror_update_device(sc, false);
1876 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) {
1877 KASSERT(ep->e_error == 0,
1878 ("Error cannot be handled."));
1879 g_mirror_event_free(ep);
1881 ep->e_flags |= G_MIRROR_EVENT_DONE;
1882 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1884 mtx_lock(&sc->sc_events_mtx);
1886 mtx_unlock(&sc->sc_events_mtx);
1889 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1890 if (g_mirror_try_destroy(sc)) {
1891 curthread->td_pflags &= ~TDP_GEOM;
1892 G_MIRROR_DEBUG(1, "Thread exiting.");
1896 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__);
1900 * Check if we can mark array as CLEAN and if we can't take
1901 * how much seconds should we wait.
1903 timeout = g_mirror_idle(sc, -1);
1907 /* Get first request from the queue. */
1908 mtx_lock(&sc->sc_queue_mtx);
1909 bp = bioq_takefirst(&sc->sc_queue);
1912 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1913 mtx_unlock(&sc->sc_queue_mtx);
1914 if (g_mirror_try_destroy(sc)) {
1915 curthread->td_pflags &= ~TDP_GEOM;
1916 G_MIRROR_DEBUG(1, "Thread exiting.");
1919 mtx_lock(&sc->sc_queue_mtx);
1921 sx_xunlock(&sc->sc_lock);
1923 * XXX: We can miss an event here, because an event
1924 * can be added without sx-device-lock and without
1925 * mtx-queue-lock. Maybe I should just stop using
1926 * dedicated mutex for events synchronization and
1927 * stick with the queue lock?
1928 * The event will hang here until next I/O request
1929 * or next event is received.
1931 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1",
1933 sx_xlock(&sc->sc_lock);
1934 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__);
1937 mtx_unlock(&sc->sc_queue_mtx);
1939 if (bp->bio_from->geom == sc->sc_sync.ds_geom &&
1940 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) {
1941 g_mirror_sync_request(bp); /* READ */
1942 } else if (bp->bio_to != sc->sc_provider) {
1943 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0)
1944 g_mirror_regular_request(bp);
1945 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
1946 g_mirror_sync_request(bp); /* WRITE */
1949 ("Invalid request cflags=0x%hx to=%s.",
1950 bp->bio_cflags, bp->bio_to->name));
1953 g_mirror_register_request(bp);
1955 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__);
1960 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
1963 sx_assert(&sc->sc_lock, SX_LOCKED);
1965 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
1967 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) {
1968 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.",
1969 g_mirror_get_diskname(disk), sc->sc_name);
1970 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
1971 } else if (sc->sc_idle &&
1972 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
1973 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.",
1974 g_mirror_get_diskname(disk), sc->sc_name);
1975 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
1980 g_mirror_sync_start(struct g_mirror_disk *disk)
1982 struct g_mirror_softc *sc;
1983 struct g_consumer *cp;
1987 g_topology_assert_not();
1989 sx_assert(&sc->sc_lock, SX_LOCKED);
1991 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
1992 ("Disk %s is not marked for synchronization.",
1993 g_mirror_get_diskname(disk)));
1994 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
1995 ("Device not in RUNNING state (%s, %u).", sc->sc_name,
1998 sx_xunlock(&sc->sc_lock);
2000 cp = g_new_consumer(sc->sc_sync.ds_geom);
2001 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
2002 error = g_attach(cp, sc->sc_provider);
2004 ("Cannot attach to %s (error=%d).", sc->sc_name, error));
2005 error = g_access(cp, 1, 0, 0);
2006 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error));
2007 g_topology_unlock();
2008 sx_xlock(&sc->sc_lock);
2010 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
2011 g_mirror_get_diskname(disk));
2012 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0)
2013 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
2014 KASSERT(disk->d_sync.ds_consumer == NULL,
2015 ("Sync consumer already exists (device=%s, disk=%s).",
2016 sc->sc_name, g_mirror_get_diskname(disk)));
2018 disk->d_sync.ds_consumer = cp;
2019 disk->d_sync.ds_consumer->private = disk;
2020 disk->d_sync.ds_consumer->index = 0;
2023 * Allocate memory for synchronization bios and initialize them.
2025 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs,
2026 M_MIRROR, M_WAITOK);
2027 for (i = 0; i < g_mirror_syncreqs; i++) {
2029 disk->d_sync.ds_bios[i] = bp;
2030 bp->bio_parent = NULL;
2031 bp->bio_cmd = BIO_READ;
2032 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK);
2034 bp->bio_offset = disk->d_sync.ds_offset;
2035 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
2036 disk->d_sync.ds_offset += bp->bio_length;
2037 bp->bio_done = g_mirror_sync_done;
2038 bp->bio_from = disk->d_sync.ds_consumer;
2039 bp->bio_to = sc->sc_provider;
2040 bp->bio_caller1 = (void *)(uintptr_t)i;
2043 /* Increase the number of disks in SYNCHRONIZING state. */
2044 sc->sc_sync.ds_ndisks++;
2045 /* Set the number of in-flight synchronization requests. */
2046 disk->d_sync.ds_inflight = g_mirror_syncreqs;
2049 * Fire off first synchronization requests.
2051 for (i = 0; i < g_mirror_syncreqs; i++) {
2052 bp = disk->d_sync.ds_bios[i];
2053 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
2054 disk->d_sync.ds_consumer->index++;
2056 * Delay the request if it is colliding with a regular request.
2058 if (g_mirror_regular_collision(sc, bp))
2059 g_mirror_sync_delay(sc, bp);
2061 g_io_request(bp, disk->d_sync.ds_consumer);
2066 * Stop synchronization process.
2067 * type: 0 - synchronization finished
2068 * 1 - synchronization stopped
2071 g_mirror_sync_stop(struct g_mirror_disk *disk, int type)
2073 struct g_mirror_softc *sc;
2074 struct g_consumer *cp;
2076 g_topology_assert_not();
2078 sx_assert(&sc->sc_lock, SX_LOCKED);
2080 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2081 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2082 g_mirror_disk_state2str(disk->d_state)));
2083 if (disk->d_sync.ds_consumer == NULL)
2087 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.",
2088 sc->sc_name, g_mirror_get_diskname(disk));
2089 } else /* if (type == 1) */ {
2090 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
2091 sc->sc_name, g_mirror_get_diskname(disk));
2093 g_mirror_regular_release(sc);
2094 free(disk->d_sync.ds_bios, M_MIRROR);
2095 disk->d_sync.ds_bios = NULL;
2096 cp = disk->d_sync.ds_consumer;
2097 disk->d_sync.ds_consumer = NULL;
2098 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2099 sc->sc_sync.ds_ndisks--;
2100 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
2102 g_mirror_kill_consumer(sc, cp);
2103 g_topology_unlock();
2104 sx_xlock(&sc->sc_lock);
2108 g_mirror_launch_provider(struct g_mirror_softc *sc)
2110 struct g_mirror_disk *disk;
2111 struct g_provider *pp, *dp;
2113 sx_assert(&sc->sc_lock, SX_LOCKED);
2116 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name);
2117 pp->flags |= G_PF_DIRECT_RECEIVE;
2118 pp->mediasize = sc->sc_mediasize;
2119 pp->sectorsize = sc->sc_sectorsize;
2121 pp->stripeoffset = 0;
2123 /* Splitting of unmapped BIO's could work but isn't implemented now */
2124 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT)
2125 pp->flags |= G_PF_ACCEPT_UNMAPPED;
2127 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2128 if (disk->d_consumer && disk->d_consumer->provider) {
2129 dp = disk->d_consumer->provider;
2130 if (dp->stripesize > pp->stripesize) {
2131 pp->stripesize = dp->stripesize;
2132 pp->stripeoffset = dp->stripeoffset;
2134 /* A provider underneath us doesn't support unmapped */
2135 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
2136 G_MIRROR_DEBUG(0, "Cancelling unmapped "
2137 "because of %s.", dp->name);
2138 pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
2144 sc->sc_provider = pp;
2145 g_error_provider(pp, 0);
2146 g_topology_unlock();
2147 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name,
2148 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks);
2149 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2150 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
2151 g_mirror_sync_start(disk);
2156 g_mirror_destroy_provider(struct g_mirror_softc *sc)
2158 struct g_mirror_disk *disk;
2161 g_topology_assert_not();
2162 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
2166 g_error_provider(sc->sc_provider, ENXIO);
2167 mtx_lock(&sc->sc_queue_mtx);
2168 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) {
2170 * Abort any pending I/O that wasn't generated by us.
2171 * Synchronization requests and requests destined for individual
2172 * mirror components can be destroyed immediately.
2174 if (bp->bio_to == sc->sc_provider &&
2175 bp->bio_from->geom != sc->sc_sync.ds_geom) {
2176 g_io_deliver(bp, ENXIO);
2178 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
2179 free(bp->bio_data, M_MIRROR);
2183 mtx_unlock(&sc->sc_queue_mtx);
2184 g_wither_provider(sc->sc_provider, ENXIO);
2185 sc->sc_provider = NULL;
2186 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name);
2187 g_topology_unlock();
2188 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2189 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
2190 g_mirror_sync_stop(disk, 1);
2195 g_mirror_go(void *arg)
2197 struct g_mirror_softc *sc;
2200 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
2201 g_mirror_event_send(sc, 0,
2202 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE);
2206 g_mirror_determine_state(struct g_mirror_disk *disk)
2208 struct g_mirror_softc *sc;
2212 if (sc->sc_syncid == disk->d_sync.ds_syncid) {
2213 if ((disk->d_flags &
2214 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
2215 /* Disk does not need synchronization. */
2216 state = G_MIRROR_DISK_STATE_ACTIVE;
2219 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2221 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
2223 * We can start synchronization from
2224 * the stored offset.
2226 state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
2228 state = G_MIRROR_DISK_STATE_STALE;
2231 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
2233 * Reset all synchronization data for this disk,
2234 * because if it even was synchronized, it was
2235 * synchronized to disks with different syncid.
2237 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2238 disk->d_sync.ds_offset = 0;
2239 disk->d_sync.ds_offset_done = 0;
2240 disk->d_sync.ds_syncid = sc->sc_syncid;
2241 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2242 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
2243 state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
2245 state = G_MIRROR_DISK_STATE_STALE;
2247 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
2249 * Not good, NOT GOOD!
2250 * It means that mirror was started on stale disks
2251 * and more fresh disk just arrive.
2252 * If there were writes, mirror is broken, sorry.
2253 * I think the best choice here is don't touch
2254 * this disk and inform the user loudly.
2256 G_MIRROR_DEBUG(0, "Device %s was started before the freshest "
2257 "disk (%s) arrives!! It will not be connected to the "
2258 "running device.", sc->sc_name,
2259 g_mirror_get_diskname(disk));
2260 g_mirror_destroy_disk(disk);
2261 state = G_MIRROR_DISK_STATE_NONE;
2262 /* Return immediately, because disk was destroyed. */
2265 G_MIRROR_DEBUG(3, "State for %s disk: %s.",
2266 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state));
2271 * Update device state.
2274 g_mirror_update_device(struct g_mirror_softc *sc, bool force)
2276 struct g_mirror_disk *disk;
2279 sx_assert(&sc->sc_lock, SX_XLOCKED);
2281 switch (sc->sc_state) {
2282 case G_MIRROR_DEVICE_STATE_STARTING:
2284 struct g_mirror_disk *pdisk, *tdisk;
2285 u_int dirty, ndisks, genid, syncid;
2288 KASSERT(sc->sc_provider == NULL,
2289 ("Non-NULL provider in STARTING state (%s).", sc->sc_name));
2291 * Are we ready? We are, if all disks are connected or
2292 * if we have any disks and 'force' is true.
2294 ndisks = g_mirror_ndisks(sc, -1);
2295 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) {
2297 } else if (ndisks == 0) {
2299 * Disks went down in starting phase, so destroy
2302 callout_drain(&sc->sc_callout);
2303 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2304 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2306 root_mount_rel(sc->sc_rootmount);
2307 sc->sc_rootmount = NULL;
2314 * Activate all disks with the biggest syncid.
2318 * If 'force' is true, we have been called due to
2319 * timeout, so don't bother canceling timeout.
2322 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2323 if ((disk->d_flags &
2324 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
2329 /* No valid disks found, destroy device. */
2330 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2331 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2332 __LINE__, sc->sc_rootmount);
2333 root_mount_rel(sc->sc_rootmount);
2334 sc->sc_rootmount = NULL;
2338 /* Cancel timeout. */
2339 callout_drain(&sc->sc_callout);
2343 * Find the biggest genid.
2346 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2347 if (disk->d_genid > genid)
2348 genid = disk->d_genid;
2350 sc->sc_genid = genid;
2352 * Remove all disks without the biggest genid.
2355 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) {
2356 if (disk->d_genid < genid) {
2358 "Component %s (device %s) broken, skipping.",
2359 g_mirror_get_diskname(disk), sc->sc_name);
2360 g_mirror_destroy_disk(disk);
2362 * Bump the syncid in case we discover a healthy
2363 * replacement disk after starting the mirror.
2370 * Find the biggest syncid.
2373 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2374 if (disk->d_sync.ds_syncid > syncid)
2375 syncid = disk->d_sync.ds_syncid;
2379 * Here we need to look for dirty disks and if all disks
2380 * with the biggest syncid are dirty, we have to choose
2381 * one with the biggest priority and rebuild the rest.
2384 * Find the number of dirty disks with the biggest syncid.
2385 * Find the number of disks with the biggest syncid.
2386 * While here, find a disk with the biggest priority.
2390 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2391 if (disk->d_sync.ds_syncid != syncid)
2393 if ((disk->d_flags &
2394 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2398 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
2400 if (pdisk == NULL ||
2401 pdisk->d_priority < disk->d_priority) {
2407 /* No dirty disks at all, great. */
2408 } else if (dirty == ndisks) {
2410 * Force synchronization for all dirty disks except one
2411 * with the biggest priority.
2413 KASSERT(pdisk != NULL, ("pdisk == NULL"));
2414 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a "
2415 "master disk for synchronization.",
2416 g_mirror_get_diskname(pdisk), sc->sc_name);
2417 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2418 if (disk->d_sync.ds_syncid != syncid)
2420 if ((disk->d_flags &
2421 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2424 KASSERT((disk->d_flags &
2425 G_MIRROR_DISK_FLAG_DIRTY) != 0,
2426 ("Disk %s isn't marked as dirty.",
2427 g_mirror_get_diskname(disk)));
2428 /* Skip the disk with the biggest priority. */
2431 disk->d_sync.ds_syncid = 0;
2433 } else if (dirty < ndisks) {
2435 * Force synchronization for all dirty disks.
2436 * We have some non-dirty disks.
2438 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2439 if (disk->d_sync.ds_syncid != syncid)
2441 if ((disk->d_flags &
2442 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2445 if ((disk->d_flags &
2446 G_MIRROR_DISK_FLAG_DIRTY) == 0) {
2449 disk->d_sync.ds_syncid = 0;
2455 sc->sc_syncid = syncid;
2456 if (force || broken) {
2457 /* Remember to bump syncid on first write. */
2458 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2460 state = G_MIRROR_DEVICE_STATE_RUNNING;
2461 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.",
2462 sc->sc_name, g_mirror_device_state2str(sc->sc_state),
2463 g_mirror_device_state2str(state));
2464 sc->sc_state = state;
2465 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2466 state = g_mirror_determine_state(disk);
2467 g_mirror_event_send(disk, state,
2468 G_MIRROR_EVENT_DONTWAIT);
2469 if (state == G_MIRROR_DISK_STATE_STALE)
2470 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2474 case G_MIRROR_DEVICE_STATE_RUNNING:
2475 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 &&
2476 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2478 * No active disks or no disks at all,
2479 * so destroy device.
2481 if (sc->sc_provider != NULL)
2482 g_mirror_destroy_provider(sc);
2483 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2485 } else if (g_mirror_ndisks(sc,
2486 G_MIRROR_DISK_STATE_ACTIVE) > 0 &&
2487 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2489 * We have active disks, launch provider if it doesn't
2492 if (sc->sc_provider == NULL)
2493 g_mirror_launch_provider(sc);
2494 if (sc->sc_rootmount != NULL) {
2495 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2496 __LINE__, sc->sc_rootmount);
2497 root_mount_rel(sc->sc_rootmount);
2498 sc->sc_rootmount = NULL;
2502 * Genid should be bumped immediately, so do it here.
2504 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) {
2505 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID;
2506 g_mirror_bump_genid(sc);
2510 KASSERT(1 == 0, ("Wrong device state (%s, %s).",
2511 sc->sc_name, g_mirror_device_state2str(sc->sc_state)));
2517 * Update disk state and device state if needed.
2519 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \
2520 "Disk %s state changed from %s to %s (device %s).", \
2521 g_mirror_get_diskname(disk), \
2522 g_mirror_disk_state2str(disk->d_state), \
2523 g_mirror_disk_state2str(state), sc->sc_name)
2525 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state)
2527 struct g_mirror_softc *sc;
2530 sx_assert(&sc->sc_lock, SX_XLOCKED);
2533 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.",
2534 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state),
2535 g_mirror_disk_state2str(state));
2537 case G_MIRROR_DISK_STATE_NEW:
2539 * Possible scenarios:
2540 * 1. New disk arrive.
2542 /* Previous state should be NONE. */
2543 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE,
2544 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2545 g_mirror_disk_state2str(disk->d_state)));
2546 DISK_STATE_CHANGED();
2548 disk->d_state = state;
2549 if (LIST_EMPTY(&sc->sc_disks))
2550 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next);
2552 struct g_mirror_disk *dp;
2554 LIST_FOREACH(dp, &sc->sc_disks, d_next) {
2555 if (disk->d_priority >= dp->d_priority) {
2556 LIST_INSERT_BEFORE(dp, disk, d_next);
2560 if (LIST_NEXT(dp, d_next) == NULL)
2564 LIST_INSERT_AFTER(dp, disk, d_next);
2566 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.",
2567 sc->sc_name, g_mirror_get_diskname(disk));
2568 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
2570 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2571 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2572 g_mirror_device_state2str(sc->sc_state),
2573 g_mirror_get_diskname(disk),
2574 g_mirror_disk_state2str(disk->d_state)));
2575 state = g_mirror_determine_state(disk);
2576 if (state != G_MIRROR_DISK_STATE_NONE)
2579 case G_MIRROR_DISK_STATE_ACTIVE:
2581 * Possible scenarios:
2582 * 1. New disk does not need synchronization.
2583 * 2. Synchronization process finished successfully.
2585 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2586 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2587 g_mirror_device_state2str(sc->sc_state),
2588 g_mirror_get_diskname(disk),
2589 g_mirror_disk_state2str(disk->d_state)));
2590 /* Previous state should be NEW or SYNCHRONIZING. */
2591 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW ||
2592 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2593 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2594 g_mirror_disk_state2str(disk->d_state)));
2595 DISK_STATE_CHANGED();
2597 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
2598 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2599 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC;
2600 g_mirror_sync_stop(disk, 0);
2602 disk->d_state = state;
2603 disk->d_sync.ds_offset = 0;
2604 disk->d_sync.ds_offset_done = 0;
2605 g_mirror_update_idle(sc, disk);
2606 g_mirror_update_metadata(disk);
2607 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.",
2608 sc->sc_name, g_mirror_get_diskname(disk));
2610 case G_MIRROR_DISK_STATE_STALE:
2612 * Possible scenarios:
2613 * 1. Stale disk was connected.
2615 /* Previous state should be NEW. */
2616 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2617 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2618 g_mirror_disk_state2str(disk->d_state)));
2619 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2620 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2621 g_mirror_device_state2str(sc->sc_state),
2622 g_mirror_get_diskname(disk),
2623 g_mirror_disk_state2str(disk->d_state)));
2625 * STALE state is only possible if device is marked
2628 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0,
2629 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2630 g_mirror_device_state2str(sc->sc_state),
2631 g_mirror_get_diskname(disk),
2632 g_mirror_disk_state2str(disk->d_state)));
2633 DISK_STATE_CHANGED();
2635 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2636 disk->d_state = state;
2637 g_mirror_update_metadata(disk);
2638 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.",
2639 sc->sc_name, g_mirror_get_diskname(disk));
2641 case G_MIRROR_DISK_STATE_SYNCHRONIZING:
2643 * Possible scenarios:
2644 * 1. Disk which needs synchronization was connected.
2646 /* Previous state should be NEW. */
2647 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2648 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2649 g_mirror_disk_state2str(disk->d_state)));
2650 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2651 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2652 g_mirror_device_state2str(sc->sc_state),
2653 g_mirror_get_diskname(disk),
2654 g_mirror_disk_state2str(disk->d_state)));
2655 DISK_STATE_CHANGED();
2657 if (disk->d_state == G_MIRROR_DISK_STATE_NEW)
2658 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2659 disk->d_state = state;
2660 if (sc->sc_provider != NULL) {
2661 g_mirror_sync_start(disk);
2662 g_mirror_update_metadata(disk);
2665 case G_MIRROR_DISK_STATE_DISCONNECTED:
2667 * Possible scenarios:
2668 * 1. Device wasn't running yet, but disk disappear.
2669 * 2. Disk was active and disapppear.
2670 * 3. Disk disappear during synchronization process.
2672 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) {
2674 * Previous state should be ACTIVE, STALE or
2677 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
2678 disk->d_state == G_MIRROR_DISK_STATE_STALE ||
2679 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2680 ("Wrong disk state (%s, %s).",
2681 g_mirror_get_diskname(disk),
2682 g_mirror_disk_state2str(disk->d_state)));
2683 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) {
2684 /* Previous state should be NEW. */
2685 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2686 ("Wrong disk state (%s, %s).",
2687 g_mirror_get_diskname(disk),
2688 g_mirror_disk_state2str(disk->d_state)));
2690 * Reset bumping syncid if disk disappeared in STARTING
2693 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0)
2694 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
2697 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
2699 g_mirror_device_state2str(sc->sc_state),
2700 g_mirror_get_diskname(disk),
2701 g_mirror_disk_state2str(disk->d_state)));
2704 DISK_STATE_CHANGED();
2705 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.",
2706 sc->sc_name, g_mirror_get_diskname(disk));
2708 g_mirror_destroy_disk(disk);
2710 case G_MIRROR_DISK_STATE_DESTROY:
2714 error = g_mirror_clear_metadata(disk);
2717 "Device %s: failed to clear metadata on %s: %d.",
2718 sc->sc_name, g_mirror_get_diskname(disk), error);
2721 DISK_STATE_CHANGED();
2722 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.",
2723 sc->sc_name, g_mirror_get_diskname(disk));
2725 g_mirror_destroy_disk(disk);
2727 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2728 g_mirror_update_metadata(disk);
2733 KASSERT(1 == 0, ("Unknown state (%u).", state));
2738 #undef DISK_STATE_CHANGED
2741 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md)
2743 struct g_provider *pp;
2747 g_topology_assert();
2749 error = g_access(cp, 1, 0, 0);
2753 g_topology_unlock();
2754 /* Metadata are stored on last sector. */
2755 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
2758 g_access(cp, -1, 0, 0);
2760 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).",
2761 cp->provider->name, error);
2765 /* Decode metadata. */
2766 error = mirror_metadata_decode(buf, md);
2768 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0)
2770 if (md->md_version > G_MIRROR_VERSION) {
2772 "Kernel module is too old to handle metadata from %s.",
2773 cp->provider->name);
2777 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
2778 cp->provider->name);
2786 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp,
2787 struct g_mirror_metadata *md)
2790 if (g_mirror_id2disk(sc, md->md_did) != NULL) {
2791 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.",
2792 pp->name, md->md_did);
2795 if (md->md_all != sc->sc_ndisks) {
2797 "Invalid '%s' field on disk %s (device %s), skipping.",
2798 "md_all", pp->name, sc->sc_name);
2801 if (md->md_slice != sc->sc_slice) {
2803 "Invalid '%s' field on disk %s (device %s), skipping.",
2804 "md_slice", pp->name, sc->sc_name);
2807 if (md->md_balance != sc->sc_balance) {
2809 "Invalid '%s' field on disk %s (device %s), skipping.",
2810 "md_balance", pp->name, sc->sc_name);
2814 if (md->md_mediasize != sc->sc_mediasize) {
2816 "Invalid '%s' field on disk %s (device %s), skipping.",
2817 "md_mediasize", pp->name, sc->sc_name);
2821 if (sc->sc_mediasize > pp->mediasize) {
2823 "Invalid size of disk %s (device %s), skipping.", pp->name,
2827 if (md->md_sectorsize != sc->sc_sectorsize) {
2829 "Invalid '%s' field on disk %s (device %s), skipping.",
2830 "md_sectorsize", pp->name, sc->sc_name);
2833 if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
2835 "Invalid sector size of disk %s (device %s), skipping.",
2836 pp->name, sc->sc_name);
2839 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) {
2841 "Invalid device flags on disk %s (device %s), skipping.",
2842 pp->name, sc->sc_name);
2845 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) {
2847 "Invalid disk flags on disk %s (device %s), skipping.",
2848 pp->name, sc->sc_name);
2855 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
2856 struct g_mirror_metadata *md)
2858 struct g_mirror_disk *disk;
2861 g_topology_assert_not();
2862 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name);
2864 error = g_mirror_check_metadata(sc, pp, md);
2867 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING &&
2868 md->md_genid < sc->sc_genid) {
2869 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.",
2870 pp->name, sc->sc_name);
2873 disk = g_mirror_init_disk(sc, pp, md, &error);
2876 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW,
2877 G_MIRROR_EVENT_WAIT);
2880 if (md->md_version < G_MIRROR_VERSION) {
2881 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
2882 pp->name, md->md_version, G_MIRROR_VERSION);
2883 g_mirror_update_metadata(disk);
2889 g_mirror_destroy_delayed(void *arg, int flag)
2891 struct g_mirror_softc *sc;
2894 if (flag == EV_CANCEL) {
2895 G_MIRROR_DEBUG(1, "Destroying canceled.");
2899 g_topology_unlock();
2900 sx_xlock(&sc->sc_lock);
2901 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0,
2902 ("DESTROY flag set on %s.", sc->sc_name));
2903 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0,
2904 ("DESTROYING flag not set on %s.", sc->sc_name));
2905 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name);
2906 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT);
2908 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).",
2909 sc->sc_name, error);
2910 sx_xunlock(&sc->sc_lock);
2916 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace)
2918 struct g_mirror_softc *sc;
2921 g_topology_assert();
2922 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
2926 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name));
2928 g_topology_unlock();
2929 sx_xlock(&sc->sc_lock);
2930 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 ||
2931 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 ||
2932 LIST_EMPTY(&sc->sc_disks)) {
2933 if (acr > 0 || acw > 0 || ace > 0)
2937 sc->sc_provider_open += acr + acw + ace;
2938 if (pp->acw + acw == 0)
2939 g_mirror_idle(sc, 0);
2940 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 &&
2941 sc->sc_provider_open == 0)
2942 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL);
2944 sx_xunlock(&sc->sc_lock);
2950 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md,
2953 struct g_mirror_softc *sc;
2957 g_topology_assert();
2958 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
2961 /* One disk is minimum. */
2967 gp = g_new_geomf(mp, "%s", md->md_name);
2968 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO);
2969 gp->start = g_mirror_start;
2970 gp->orphan = g_mirror_orphan;
2971 gp->access = g_mirror_access;
2972 gp->dumpconf = g_mirror_dumpconf;
2975 sc->sc_id = md->md_mid;
2976 sc->sc_slice = md->md_slice;
2977 sc->sc_balance = md->md_balance;
2978 sc->sc_mediasize = md->md_mediasize;
2979 sc->sc_sectorsize = md->md_sectorsize;
2980 sc->sc_ndisks = md->md_all;
2981 sc->sc_flags = md->md_mflags;
2984 sc->sc_last_write = time_uptime;
2987 sx_init(&sc->sc_lock, "gmirror:lock");
2988 bioq_init(&sc->sc_queue);
2989 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF);
2990 bioq_init(&sc->sc_regular_delayed);
2991 bioq_init(&sc->sc_inflight);
2992 bioq_init(&sc->sc_sync_delayed);
2993 LIST_INIT(&sc->sc_disks);
2994 TAILQ_INIT(&sc->sc_events);
2995 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF);
2996 callout_init(&sc->sc_callout, 1);
2997 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF);
2998 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING;
3001 sc->sc_provider = NULL;
3002 sc->sc_provider_open = 0;
3004 * Synchronization geom.
3006 gp = g_new_geomf(mp, "%s.sync", md->md_name);
3008 gp->orphan = g_mirror_orphan;
3009 sc->sc_sync.ds_geom = gp;
3010 sc->sc_sync.ds_ndisks = 0;
3011 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0,
3012 "g_mirror %s", md->md_name);
3014 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.",
3016 g_destroy_geom(sc->sc_sync.ds_geom);
3017 g_destroy_geom(sc->sc_geom);
3018 g_mirror_free_device(sc);
3022 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).",
3023 sc->sc_name, sc->sc_ndisks, sc->sc_id);
3025 sc->sc_rootmount = root_mount_hold("GMIRROR");
3026 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
3030 timeout = g_mirror_timeout * hz;
3031 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc);
3032 return (sc->sc_geom);
3036 g_mirror_destroy(struct g_mirror_softc *sc, int how)
3038 struct g_mirror_disk *disk;
3040 g_topology_assert_not();
3041 sx_assert(&sc->sc_lock, SX_XLOCKED);
3043 if (sc->sc_provider_open != 0 || SCHEDULER_STOPPED()) {
3045 case G_MIRROR_DESTROY_SOFT:
3047 "Device %s is still open (%d).", sc->sc_name,
3048 sc->sc_provider_open);
3050 case G_MIRROR_DESTROY_DELAYED:
3052 "Device %s will be destroyed on last close.",
3054 LIST_FOREACH(disk, &sc->sc_disks, d_next) {
3055 if (disk->d_state ==
3056 G_MIRROR_DISK_STATE_SYNCHRONIZING) {
3057 g_mirror_sync_stop(disk, 1);
3060 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING;
3062 case G_MIRROR_DESTROY_HARD:
3063 G_MIRROR_DEBUG(1, "Device %s is still open, so it "
3064 "can't be definitely removed.", sc->sc_name);
3069 if (sc->sc_geom->softc == NULL) {
3070 g_topology_unlock();
3073 sc->sc_geom->softc = NULL;
3074 sc->sc_sync.ds_geom->softc = NULL;
3075 g_topology_unlock();
3077 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
3078 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT;
3079 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
3080 sx_xunlock(&sc->sc_lock);
3081 mtx_lock(&sc->sc_queue_mtx);
3083 mtx_unlock(&sc->sc_queue_mtx);
3084 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
3085 while (sc->sc_worker != NULL)
3086 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5);
3087 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
3088 sx_xlock(&sc->sc_lock);
3089 g_mirror_destroy_device(sc);
3094 g_mirror_taste_orphan(struct g_consumer *cp)
3097 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
3098 cp->provider->name));
3101 static struct g_geom *
3102 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
3104 struct g_mirror_metadata md;
3105 struct g_mirror_softc *sc;
3106 struct g_consumer *cp;
3110 g_topology_assert();
3111 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
3112 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name);
3114 gp = g_new_geomf(mp, "mirror:taste");
3116 * This orphan function should be never called.
3118 gp->orphan = g_mirror_taste_orphan;
3119 cp = g_new_consumer(gp);
3121 error = g_mirror_read_metadata(cp, &md);
3123 g_destroy_consumer(cp);
3129 if (md.md_provider[0] != '\0' &&
3130 !g_compare_names(md.md_provider, pp->name))
3132 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
3134 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) {
3136 "Device %s: provider %s marked as inactive, skipping.",
3137 md.md_name, pp->name);
3140 if (g_mirror_debug >= 2)
3141 mirror_metadata_dump(&md);
3144 * Let's check if device already exists.
3147 LIST_FOREACH(gp, &mp->geom, geom) {
3151 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
3153 if (sc->sc_sync.ds_geom == gp)
3155 if (strcmp(md.md_name, sc->sc_name) != 0)
3157 if (md.md_mid != sc->sc_id) {
3158 G_MIRROR_DEBUG(0, "Device %s already configured.",
3165 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC);
3167 G_MIRROR_DEBUG(0, "Cannot create device %s.",
3173 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
3174 g_topology_unlock();
3175 sx_xlock(&sc->sc_lock);
3176 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING;
3177 error = g_mirror_add_disk(sc, pp, &md);
3179 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
3180 pp->name, gp->name, error);
3181 if (LIST_EMPTY(&sc->sc_disks)) {
3183 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
3189 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING;
3190 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
3191 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
3195 sx_xunlock(&sc->sc_lock);
3201 g_mirror_resize(struct g_consumer *cp)
3203 struct g_mirror_disk *disk;
3205 g_topology_assert();
3206 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name);
3211 g_topology_unlock();
3212 g_mirror_update_metadata(disk);
3217 g_mirror_destroy_geom(struct gctl_req *req __unused,
3218 struct g_class *mp __unused, struct g_geom *gp)
3220 struct g_mirror_softc *sc;
3223 g_topology_unlock();
3225 sx_xlock(&sc->sc_lock);
3227 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT);
3229 sx_xunlock(&sc->sc_lock);
3235 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
3236 struct g_consumer *cp, struct g_provider *pp)
3238 struct g_mirror_softc *sc;
3240 g_topology_assert();
3245 /* Skip synchronization geom. */
3246 if (gp == sc->sc_sync.ds_geom)
3250 } else if (cp != NULL) {
3251 struct g_mirror_disk *disk;
3256 g_topology_unlock();
3257 sx_xlock(&sc->sc_lock);
3258 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id);
3259 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
3260 sbuf_printf(sb, "%s<Synchronized>", indent);
3261 if (disk->d_sync.ds_offset == 0)
3262 sbuf_printf(sb, "0%%");
3264 sbuf_printf(sb, "%u%%",
3265 (u_int)((disk->d_sync.ds_offset * 100) /
3266 sc->sc_provider->mediasize));
3268 sbuf_printf(sb, "</Synchronized>\n");
3269 if (disk->d_sync.ds_offset > 0) {
3270 sbuf_printf(sb, "%s<BytesSynced>%jd"
3271 "</BytesSynced>\n", indent,
3272 (intmax_t)disk->d_sync.ds_offset);
3275 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
3276 disk->d_sync.ds_syncid);
3277 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent,
3279 sbuf_printf(sb, "%s<Flags>", indent);
3280 if (disk->d_flags == 0)
3281 sbuf_printf(sb, "NONE");
3285 #define ADD_FLAG(flag, name) do { \
3286 if ((disk->d_flags & (flag)) != 0) { \
3288 sbuf_printf(sb, ", "); \
3291 sbuf_printf(sb, name); \
3294 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY");
3295 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED");
3296 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE");
3297 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING,
3299 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
3300 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN");
3303 sbuf_printf(sb, "</Flags>\n");
3304 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent,
3306 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3307 g_mirror_disk_state2str(disk->d_state));
3308 sx_xunlock(&sc->sc_lock);
3311 g_topology_unlock();
3312 sx_xlock(&sc->sc_lock);
3313 sbuf_printf(sb, "%s<Type>", indent);
3314 switch (sc->sc_type) {
3315 case G_MIRROR_TYPE_AUTOMATIC:
3316 sbuf_printf(sb, "AUTOMATIC");
3318 case G_MIRROR_TYPE_MANUAL:
3319 sbuf_printf(sb, "MANUAL");
3322 sbuf_printf(sb, "UNKNOWN");
3325 sbuf_printf(sb, "</Type>\n");
3326 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
3327 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
3328 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
3329 sbuf_printf(sb, "%s<Flags>", indent);
3330 if (sc->sc_flags == 0)
3331 sbuf_printf(sb, "NONE");
3335 #define ADD_FLAG(flag, name) do { \
3336 if ((sc->sc_flags & (flag)) != 0) { \
3338 sbuf_printf(sb, ", "); \
3341 sbuf_printf(sb, name); \
3344 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC");
3345 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
3348 sbuf_printf(sb, "</Flags>\n");
3349 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent,
3350 (u_int)sc->sc_slice);
3351 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent,
3352 balance_name(sc->sc_balance));
3353 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
3355 sbuf_printf(sb, "%s<State>", indent);
3356 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
3357 sbuf_printf(sb, "%s", "STARTING");
3358 else if (sc->sc_ndisks ==
3359 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE))
3360 sbuf_printf(sb, "%s", "COMPLETE");
3362 sbuf_printf(sb, "%s", "DEGRADED");
3363 sbuf_printf(sb, "</State>\n");
3364 sx_xunlock(&sc->sc_lock);
3370 g_mirror_shutdown_post_sync(void *arg, int howto)
3373 struct g_geom *gp, *gp2;
3374 struct g_mirror_softc *sc;
3379 g_mirror_shutdown = 1;
3380 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
3381 if ((sc = gp->softc) == NULL)
3383 /* Skip synchronization geom. */
3384 if (gp == sc->sc_sync.ds_geom)
3386 g_topology_unlock();
3387 sx_xlock(&sc->sc_lock);
3388 g_mirror_idle(sc, -1);
3390 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED);
3392 sx_xunlock(&sc->sc_lock);
3395 g_topology_unlock();
3399 g_mirror_init(struct g_class *mp)
3402 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync,
3403 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST);
3404 if (g_mirror_post_sync == NULL)
3405 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event.");
3409 g_mirror_fini(struct g_class *mp)
3412 if (g_mirror_post_sync != NULL)
3413 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync);
3416 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror);