g_mirror.c revision 201566
1/*-
2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/geom/mirror/g_mirror.c 201566 2010-01-05 10:30:56Z mav $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/limits.h>
35#include <sys/lock.h>
36#include <sys/mutex.h>
37#include <sys/bio.h>
38#include <sys/sysctl.h>
39#include <sys/malloc.h>
40#include <sys/eventhandler.h>
41#include <vm/uma.h>
42#include <geom/geom.h>
43#include <sys/proc.h>
44#include <sys/kthread.h>
45#include <sys/sched.h>
46#include <geom/mirror/g_mirror.h>
47
48
49static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data");
50
51SYSCTL_DECL(_kern_geom);
52SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff");
53u_int g_mirror_debug = 0;
54TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug);
55SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0,
56    "Debug level");
57static u_int g_mirror_timeout = 4;
58TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout);
59SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout,
60    0, "Time to wait on all mirror components");
61static u_int g_mirror_idletime = 5;
62TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime);
63SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW,
64    &g_mirror_idletime, 0, "Mark components as clean when idling");
65static u_int g_mirror_disconnect_on_failure = 1;
66TUNABLE_INT("kern.geom.mirror.disconnect_on_failure",
67    &g_mirror_disconnect_on_failure);
68SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW,
69    &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure.");
70static u_int g_mirror_syncreqs = 2;
71TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs);
72SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN,
73    &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests.");
74
75#define	MSLEEP(ident, mtx, priority, wmesg, timeout)	do {		\
76	G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident));	\
77	msleep((ident), (mtx), (priority), (wmesg), (timeout));		\
78	G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident));	\
79} while (0)
80
81static eventhandler_tag g_mirror_pre_sync = NULL;
82
83static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp,
84    struct g_geom *gp);
85static g_taste_t g_mirror_taste;
86static void g_mirror_init(struct g_class *mp);
87static void g_mirror_fini(struct g_class *mp);
88
89struct g_class g_mirror_class = {
90	.name = G_MIRROR_CLASS_NAME,
91	.version = G_VERSION,
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};
98
99
100static void g_mirror_destroy_provider(struct g_mirror_softc *sc);
101static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state);
102static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force);
103static void g_mirror_dumpconf(struct sbuf *sb, const char *indent,
104    struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
105static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type);
106static void g_mirror_register_request(struct bio *bp);
107static void g_mirror_sync_release(struct g_mirror_softc *sc);
108
109
110static const char *
111g_mirror_disk_state2str(int state)
112{
113
114	switch (state) {
115	case G_MIRROR_DISK_STATE_NONE:
116		return ("NONE");
117	case G_MIRROR_DISK_STATE_NEW:
118		return ("NEW");
119	case G_MIRROR_DISK_STATE_ACTIVE:
120		return ("ACTIVE");
121	case G_MIRROR_DISK_STATE_STALE:
122		return ("STALE");
123	case G_MIRROR_DISK_STATE_SYNCHRONIZING:
124		return ("SYNCHRONIZING");
125	case G_MIRROR_DISK_STATE_DISCONNECTED:
126		return ("DISCONNECTED");
127	case G_MIRROR_DISK_STATE_DESTROY:
128		return ("DESTROY");
129	default:
130		return ("INVALID");
131	}
132}
133
134static const char *
135g_mirror_device_state2str(int state)
136{
137
138	switch (state) {
139	case G_MIRROR_DEVICE_STATE_STARTING:
140		return ("STARTING");
141	case G_MIRROR_DEVICE_STATE_RUNNING:
142		return ("RUNNING");
143	default:
144		return ("INVALID");
145	}
146}
147
148static const char *
149g_mirror_get_diskname(struct g_mirror_disk *disk)
150{
151
152	if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
153		return ("[unknown]");
154	return (disk->d_name);
155}
156
157/*
158 * --- Events handling functions ---
159 * Events in geom_mirror are used to maintain disks and device status
160 * from one thread to simplify locking.
161 */
162static void
163g_mirror_event_free(struct g_mirror_event *ep)
164{
165
166	free(ep, M_MIRROR);
167}
168
169int
170g_mirror_event_send(void *arg, int state, int flags)
171{
172	struct g_mirror_softc *sc;
173	struct g_mirror_disk *disk;
174	struct g_mirror_event *ep;
175	int error;
176
177	ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK);
178	G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep);
179	if ((flags & G_MIRROR_EVENT_DEVICE) != 0) {
180		disk = NULL;
181		sc = arg;
182	} else {
183		disk = arg;
184		sc = disk->d_softc;
185	}
186	ep->e_disk = disk;
187	ep->e_state = state;
188	ep->e_flags = flags;
189	ep->e_error = 0;
190	mtx_lock(&sc->sc_events_mtx);
191	TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
192	mtx_unlock(&sc->sc_events_mtx);
193	G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
194	mtx_lock(&sc->sc_queue_mtx);
195	wakeup(sc);
196	mtx_unlock(&sc->sc_queue_mtx);
197	if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0)
198		return (0);
199	sx_assert(&sc->sc_lock, SX_XLOCKED);
200	G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
201	sx_xunlock(&sc->sc_lock);
202	while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) {
203		mtx_lock(&sc->sc_events_mtx);
204		MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event",
205		    hz * 5);
206	}
207	error = ep->e_error;
208	g_mirror_event_free(ep);
209	sx_xlock(&sc->sc_lock);
210	return (error);
211}
212
213static struct g_mirror_event *
214g_mirror_event_get(struct g_mirror_softc *sc)
215{
216	struct g_mirror_event *ep;
217
218	mtx_lock(&sc->sc_events_mtx);
219	ep = TAILQ_FIRST(&sc->sc_events);
220	mtx_unlock(&sc->sc_events_mtx);
221	return (ep);
222}
223
224static void
225g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep)
226{
227
228	mtx_lock(&sc->sc_events_mtx);
229	TAILQ_REMOVE(&sc->sc_events, ep, e_next);
230	mtx_unlock(&sc->sc_events_mtx);
231}
232
233static void
234g_mirror_event_cancel(struct g_mirror_disk *disk)
235{
236	struct g_mirror_softc *sc;
237	struct g_mirror_event *ep, *tmpep;
238
239	sc = disk->d_softc;
240	sx_assert(&sc->sc_lock, SX_XLOCKED);
241
242	mtx_lock(&sc->sc_events_mtx);
243	TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
244		if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0)
245			continue;
246		if (ep->e_disk != disk)
247			continue;
248		TAILQ_REMOVE(&sc->sc_events, ep, e_next);
249		if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
250			g_mirror_event_free(ep);
251		else {
252			ep->e_error = ECANCELED;
253			wakeup(ep);
254		}
255	}
256	mtx_unlock(&sc->sc_events_mtx);
257}
258
259/*
260 * Return the number of disks in given state.
261 * If state is equal to -1, count all connected disks.
262 */
263u_int
264g_mirror_ndisks(struct g_mirror_softc *sc, int state)
265{
266	struct g_mirror_disk *disk;
267	u_int n = 0;
268
269	sx_assert(&sc->sc_lock, SX_LOCKED);
270
271	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
272		if (state == -1 || disk->d_state == state)
273			n++;
274	}
275	return (n);
276}
277
278/*
279 * Find a disk in mirror by its disk ID.
280 */
281static struct g_mirror_disk *
282g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id)
283{
284	struct g_mirror_disk *disk;
285
286	sx_assert(&sc->sc_lock, SX_XLOCKED);
287
288	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
289		if (disk->d_id == id)
290			return (disk);
291	}
292	return (NULL);
293}
294
295static u_int
296g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp)
297{
298	struct bio *bp;
299	u_int nreqs = 0;
300
301	mtx_lock(&sc->sc_queue_mtx);
302	TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
303		if (bp->bio_from == cp)
304			nreqs++;
305	}
306	mtx_unlock(&sc->sc_queue_mtx);
307	return (nreqs);
308}
309
310static int
311g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp)
312{
313
314	if (cp->index > 0) {
315		G_MIRROR_DEBUG(2,
316		    "I/O requests for %s exist, can't destroy it now.",
317		    cp->provider->name);
318		return (1);
319	}
320	if (g_mirror_nrequests(sc, cp) > 0) {
321		G_MIRROR_DEBUG(2,
322		    "I/O requests for %s in queue, can't destroy it now.",
323		    cp->provider->name);
324		return (1);
325	}
326	return (0);
327}
328
329static void
330g_mirror_destroy_consumer(void *arg, int flags __unused)
331{
332	struct g_consumer *cp;
333
334	g_topology_assert();
335
336	cp = arg;
337	G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
338	g_detach(cp);
339	g_destroy_consumer(cp);
340}
341
342static void
343g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
344{
345	struct g_provider *pp;
346	int retaste_wait;
347
348	g_topology_assert();
349
350	cp->private = NULL;
351	if (g_mirror_is_busy(sc, cp))
352		return;
353	pp = cp->provider;
354	retaste_wait = 0;
355	if (cp->acw == 1) {
356		if ((pp->geom->flags & G_GEOM_WITHER) == 0)
357			retaste_wait = 1;
358	}
359	G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
360	    -cp->acw, -cp->ace, 0);
361	if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
362		g_access(cp, -cp->acr, -cp->acw, -cp->ace);
363	if (retaste_wait) {
364		/*
365		 * After retaste event was send (inside g_access()), we can send
366		 * event to detach and destroy consumer.
367		 * A class, which has consumer to the given provider connected
368		 * will not receive retaste event for the provider.
369		 * This is the way how I ignore retaste events when I close
370		 * consumers opened for write: I detach and destroy consumer
371		 * after retaste event is sent.
372		 */
373		g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL);
374		return;
375	}
376	G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name);
377	g_detach(cp);
378	g_destroy_consumer(cp);
379}
380
381static int
382g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp)
383{
384	struct g_consumer *cp;
385	int error;
386
387	g_topology_assert_not();
388	KASSERT(disk->d_consumer == NULL,
389	    ("Disk already connected (device %s).", disk->d_softc->sc_name));
390
391	g_topology_lock();
392	cp = g_new_consumer(disk->d_softc->sc_geom);
393	error = g_attach(cp, pp);
394	if (error != 0) {
395		g_destroy_consumer(cp);
396		g_topology_unlock();
397		return (error);
398	}
399	error = g_access(cp, 1, 1, 1);
400	if (error != 0) {
401		g_detach(cp);
402		g_destroy_consumer(cp);
403		g_topology_unlock();
404		G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).",
405		    pp->name, error);
406		return (error);
407	}
408	g_topology_unlock();
409	disk->d_consumer = cp;
410	disk->d_consumer->private = disk;
411	disk->d_consumer->index = 0;
412
413	G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk));
414	return (0);
415}
416
417static void
418g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
419{
420
421	g_topology_assert();
422
423	if (cp == NULL)
424		return;
425	if (cp->provider != NULL)
426		g_mirror_kill_consumer(sc, cp);
427	else
428		g_destroy_consumer(cp);
429}
430
431/*
432 * Initialize disk. This means allocate memory, create consumer, attach it
433 * to the provider and open access (r1w1e1) to it.
434 */
435static struct g_mirror_disk *
436g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp,
437    struct g_mirror_metadata *md, int *errorp)
438{
439	struct g_mirror_disk *disk;
440	int error;
441
442	disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO);
443	if (disk == NULL) {
444		error = ENOMEM;
445		goto fail;
446	}
447	disk->d_softc = sc;
448	error = g_mirror_connect_disk(disk, pp);
449	if (error != 0)
450		goto fail;
451	disk->d_id = md->md_did;
452	disk->d_state = G_MIRROR_DISK_STATE_NONE;
453	disk->d_priority = md->md_priority;
454	disk->d_flags = md->md_dflags;
455	if (md->md_provider[0] != '\0')
456		disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED;
457	disk->d_sync.ds_consumer = NULL;
458	disk->d_sync.ds_offset = md->md_sync_offset;
459	disk->d_sync.ds_offset_done = md->md_sync_offset;
460	disk->d_genid = md->md_genid;
461	disk->d_sync.ds_syncid = md->md_syncid;
462	if (errorp != NULL)
463		*errorp = 0;
464	return (disk);
465fail:
466	if (errorp != NULL)
467		*errorp = error;
468	if (disk != NULL)
469		free(disk, M_MIRROR);
470	return (NULL);
471}
472
473static void
474g_mirror_destroy_disk(struct g_mirror_disk *disk)
475{
476	struct g_mirror_softc *sc;
477
478	g_topology_assert_not();
479	sc = disk->d_softc;
480	sx_assert(&sc->sc_lock, SX_XLOCKED);
481
482	LIST_REMOVE(disk, d_next);
483	g_mirror_event_cancel(disk);
484	if (sc->sc_hint == disk)
485		sc->sc_hint = NULL;
486	switch (disk->d_state) {
487	case G_MIRROR_DISK_STATE_SYNCHRONIZING:
488		g_mirror_sync_stop(disk, 1);
489		/* FALLTHROUGH */
490	case G_MIRROR_DISK_STATE_NEW:
491	case G_MIRROR_DISK_STATE_STALE:
492	case G_MIRROR_DISK_STATE_ACTIVE:
493		g_topology_lock();
494		g_mirror_disconnect_consumer(sc, disk->d_consumer);
495		g_topology_unlock();
496		free(disk, M_MIRROR);
497		break;
498	default:
499		KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
500		    g_mirror_get_diskname(disk),
501		    g_mirror_disk_state2str(disk->d_state)));
502	}
503}
504
505static void
506g_mirror_destroy_device(struct g_mirror_softc *sc)
507{
508	struct g_mirror_disk *disk;
509	struct g_mirror_event *ep;
510	struct g_geom *gp;
511	struct g_consumer *cp, *tmpcp;
512
513	g_topology_assert_not();
514	sx_assert(&sc->sc_lock, SX_XLOCKED);
515
516	gp = sc->sc_geom;
517	if (sc->sc_provider != NULL)
518		g_mirror_destroy_provider(sc);
519	for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL;
520	    disk = LIST_FIRST(&sc->sc_disks)) {
521		disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
522		g_mirror_update_metadata(disk);
523		g_mirror_destroy_disk(disk);
524	}
525	while ((ep = g_mirror_event_get(sc)) != NULL) {
526		g_mirror_event_remove(sc, ep);
527		if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
528			g_mirror_event_free(ep);
529		else {
530			ep->e_error = ECANCELED;
531			ep->e_flags |= G_MIRROR_EVENT_DONE;
532			G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep);
533			mtx_lock(&sc->sc_events_mtx);
534			wakeup(ep);
535			mtx_unlock(&sc->sc_events_mtx);
536		}
537	}
538	callout_drain(&sc->sc_callout);
539
540	g_topology_lock();
541	LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) {
542		g_mirror_disconnect_consumer(sc, cp);
543	}
544	g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
545	G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name);
546	g_wither_geom(gp, ENXIO);
547	g_topology_unlock();
548	mtx_destroy(&sc->sc_queue_mtx);
549	mtx_destroy(&sc->sc_events_mtx);
550	sx_xunlock(&sc->sc_lock);
551	sx_destroy(&sc->sc_lock);
552}
553
554static void
555g_mirror_orphan(struct g_consumer *cp)
556{
557	struct g_mirror_disk *disk;
558
559	g_topology_assert();
560
561	disk = cp->private;
562	if (disk == NULL)
563		return;
564	disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
565	g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
566	    G_MIRROR_EVENT_DONTWAIT);
567}
568
569/*
570 * Function should return the next active disk on the list.
571 * It is possible that it will be the same disk as given.
572 * If there are no active disks on list, NULL is returned.
573 */
574static __inline struct g_mirror_disk *
575g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
576{
577	struct g_mirror_disk *dp;
578
579	for (dp = LIST_NEXT(disk, d_next); dp != disk;
580	    dp = LIST_NEXT(dp, d_next)) {
581		if (dp == NULL)
582			dp = LIST_FIRST(&sc->sc_disks);
583		if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE)
584			break;
585	}
586	if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
587		return (NULL);
588	return (dp);
589}
590
591static struct g_mirror_disk *
592g_mirror_get_disk(struct g_mirror_softc *sc)
593{
594	struct g_mirror_disk *disk;
595
596	if (sc->sc_hint == NULL) {
597		sc->sc_hint = LIST_FIRST(&sc->sc_disks);
598		if (sc->sc_hint == NULL)
599			return (NULL);
600	}
601	disk = sc->sc_hint;
602	if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) {
603		disk = g_mirror_find_next(sc, disk);
604		if (disk == NULL)
605			return (NULL);
606	}
607	sc->sc_hint = g_mirror_find_next(sc, disk);
608	return (disk);
609}
610
611static int
612g_mirror_write_metadata(struct g_mirror_disk *disk,
613    struct g_mirror_metadata *md)
614{
615	struct g_mirror_softc *sc;
616	struct g_consumer *cp;
617	off_t offset, length;
618	u_char *sector;
619	int error = 0;
620
621	g_topology_assert_not();
622	sc = disk->d_softc;
623	sx_assert(&sc->sc_lock, SX_LOCKED);
624
625	cp = disk->d_consumer;
626	KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
627	KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
628	KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
629	    ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
630	    cp->acw, cp->ace));
631	length = cp->provider->sectorsize;
632	offset = cp->provider->mediasize - length;
633	sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO);
634	if (md != NULL)
635		mirror_metadata_encode(md, sector);
636	error = g_write_data(cp, offset, sector, length);
637	free(sector, M_MIRROR);
638	if (error != 0) {
639		if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
640			disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
641			G_MIRROR_DEBUG(0, "Cannot write metadata on %s "
642			    "(device=%s, error=%d).",
643			    g_mirror_get_diskname(disk), sc->sc_name, error);
644		} else {
645			G_MIRROR_DEBUG(1, "Cannot write metadata on %s "
646			    "(device=%s, error=%d).",
647			    g_mirror_get_diskname(disk), sc->sc_name, error);
648		}
649		if (g_mirror_disconnect_on_failure &&
650		    g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) {
651			sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
652			g_mirror_event_send(disk,
653			    G_MIRROR_DISK_STATE_DISCONNECTED,
654			    G_MIRROR_EVENT_DONTWAIT);
655		}
656	}
657	return (error);
658}
659
660static int
661g_mirror_clear_metadata(struct g_mirror_disk *disk)
662{
663	int error;
664
665	g_topology_assert_not();
666	sx_assert(&disk->d_softc->sc_lock, SX_LOCKED);
667
668	error = g_mirror_write_metadata(disk, NULL);
669	if (error == 0) {
670		G_MIRROR_DEBUG(2, "Metadata on %s cleared.",
671		    g_mirror_get_diskname(disk));
672	} else {
673		G_MIRROR_DEBUG(0,
674		    "Cannot clear metadata on disk %s (error=%d).",
675		    g_mirror_get_diskname(disk), error);
676	}
677	return (error);
678}
679
680void
681g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk,
682    struct g_mirror_metadata *md)
683{
684
685	strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic));
686	md->md_version = G_MIRROR_VERSION;
687	strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
688	md->md_mid = sc->sc_id;
689	md->md_all = sc->sc_ndisks;
690	md->md_slice = sc->sc_slice;
691	md->md_balance = sc->sc_balance;
692	md->md_genid = sc->sc_genid;
693	md->md_mediasize = sc->sc_mediasize;
694	md->md_sectorsize = sc->sc_sectorsize;
695	md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK);
696	bzero(md->md_provider, sizeof(md->md_provider));
697	if (disk == NULL) {
698		md->md_did = arc4random();
699		md->md_priority = 0;
700		md->md_syncid = 0;
701		md->md_dflags = 0;
702		md->md_sync_offset = 0;
703		md->md_provsize = 0;
704	} else {
705		md->md_did = disk->d_id;
706		md->md_priority = disk->d_priority;
707		md->md_syncid = disk->d_sync.ds_syncid;
708		md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK);
709		if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
710			md->md_sync_offset = disk->d_sync.ds_offset_done;
711		else
712			md->md_sync_offset = 0;
713		if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) {
714			strlcpy(md->md_provider,
715			    disk->d_consumer->provider->name,
716			    sizeof(md->md_provider));
717		}
718		md->md_provsize = disk->d_consumer->provider->mediasize;
719	}
720}
721
722void
723g_mirror_update_metadata(struct g_mirror_disk *disk)
724{
725	struct g_mirror_softc *sc;
726	struct g_mirror_metadata md;
727	int error;
728
729	g_topology_assert_not();
730	sc = disk->d_softc;
731	sx_assert(&sc->sc_lock, SX_LOCKED);
732
733	g_mirror_fill_metadata(sc, disk, &md);
734	error = g_mirror_write_metadata(disk, &md);
735	if (error == 0) {
736		G_MIRROR_DEBUG(2, "Metadata on %s updated.",
737		    g_mirror_get_diskname(disk));
738	} else {
739		G_MIRROR_DEBUG(0,
740		    "Cannot update metadata on disk %s (error=%d).",
741		    g_mirror_get_diskname(disk), error);
742	}
743}
744
745static void
746g_mirror_bump_syncid(struct g_mirror_softc *sc)
747{
748	struct g_mirror_disk *disk;
749
750	g_topology_assert_not();
751	sx_assert(&sc->sc_lock, SX_XLOCKED);
752	KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
753	    ("%s called with no active disks (device=%s).", __func__,
754	    sc->sc_name));
755
756	sc->sc_syncid++;
757	G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
758	    sc->sc_syncid);
759	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
760		if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
761		    disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
762			disk->d_sync.ds_syncid = sc->sc_syncid;
763			g_mirror_update_metadata(disk);
764		}
765	}
766}
767
768static void
769g_mirror_bump_genid(struct g_mirror_softc *sc)
770{
771	struct g_mirror_disk *disk;
772
773	g_topology_assert_not();
774	sx_assert(&sc->sc_lock, SX_XLOCKED);
775	KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
776	    ("%s called with no active disks (device=%s).", __func__,
777	    sc->sc_name));
778
779	sc->sc_genid++;
780	G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
781	    sc->sc_genid);
782	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
783		if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
784		    disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
785			disk->d_genid = sc->sc_genid;
786			g_mirror_update_metadata(disk);
787		}
788	}
789}
790
791static int
792g_mirror_idle(struct g_mirror_softc *sc, int acw)
793{
794	struct g_mirror_disk *disk;
795	int timeout;
796
797	g_topology_assert_not();
798	sx_assert(&sc->sc_lock, SX_XLOCKED);
799
800	if (sc->sc_provider == NULL)
801		return (0);
802	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
803		return (0);
804	if (sc->sc_idle)
805		return (0);
806	if (sc->sc_writes > 0)
807		return (0);
808	if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) {
809		timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write);
810		if (timeout > 0)
811			return (timeout);
812	}
813	sc->sc_idle = 1;
814	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
815		if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
816			continue;
817		G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.",
818		    g_mirror_get_diskname(disk), sc->sc_name);
819		disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
820		g_mirror_update_metadata(disk);
821	}
822	return (0);
823}
824
825static void
826g_mirror_unidle(struct g_mirror_softc *sc)
827{
828	struct g_mirror_disk *disk;
829
830	g_topology_assert_not();
831	sx_assert(&sc->sc_lock, SX_XLOCKED);
832
833	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
834		return;
835	sc->sc_idle = 0;
836	sc->sc_last_write = time_uptime;
837	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
838		if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
839			continue;
840		G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.",
841		    g_mirror_get_diskname(disk), sc->sc_name);
842		disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
843		g_mirror_update_metadata(disk);
844	}
845}
846
847static __inline int
848bintime_cmp(struct bintime *bt1, struct bintime *bt2)
849{
850
851	if (bt1->sec < bt2->sec)
852		return (-1);
853	else if (bt1->sec > bt2->sec)
854		return (1);
855	if (bt1->frac < bt2->frac)
856		return (-1);
857	else if (bt1->frac > bt2->frac)
858		return (1);
859	return (0);
860}
861
862static void
863g_mirror_done(struct bio *bp)
864{
865	struct g_mirror_softc *sc;
866
867	sc = bp->bio_from->geom->softc;
868	bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR;
869	mtx_lock(&sc->sc_queue_mtx);
870	bioq_disksort(&sc->sc_queue, bp);
871	mtx_unlock(&sc->sc_queue_mtx);
872	wakeup(sc);
873}
874
875static void
876g_mirror_regular_request(struct bio *bp)
877{
878	struct g_mirror_softc *sc;
879	struct g_mirror_disk *disk;
880	struct bio *pbp;
881
882	g_topology_assert_not();
883
884	pbp = bp->bio_parent;
885	sc = pbp->bio_to->geom->softc;
886	bp->bio_from->index--;
887	if (bp->bio_cmd == BIO_WRITE)
888		sc->sc_writes--;
889	disk = bp->bio_from->private;
890	if (disk == NULL) {
891		g_topology_lock();
892		g_mirror_kill_consumer(sc, bp->bio_from);
893		g_topology_unlock();
894	}
895
896	pbp->bio_inbed++;
897	KASSERT(pbp->bio_inbed <= pbp->bio_children,
898	    ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
899	    pbp->bio_children));
900	if (bp->bio_error == 0 && pbp->bio_error == 0) {
901		G_MIRROR_LOGREQ(3, bp, "Request delivered.");
902		g_destroy_bio(bp);
903		if (pbp->bio_children == pbp->bio_inbed) {
904			G_MIRROR_LOGREQ(3, pbp, "Request delivered.");
905			pbp->bio_completed = pbp->bio_length;
906			if (pbp->bio_cmd == BIO_WRITE) {
907				bioq_remove(&sc->sc_inflight, pbp);
908				/* Release delayed sync requests if possible. */
909				g_mirror_sync_release(sc);
910			}
911			g_io_deliver(pbp, pbp->bio_error);
912		}
913		return;
914	} else if (bp->bio_error != 0) {
915		if (pbp->bio_error == 0)
916			pbp->bio_error = bp->bio_error;
917		if (disk != NULL) {
918			if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
919				disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
920				G_MIRROR_LOGREQ(0, bp,
921				    "Request failed (error=%d).",
922				    bp->bio_error);
923			} else {
924				G_MIRROR_LOGREQ(1, bp,
925				    "Request failed (error=%d).",
926				    bp->bio_error);
927			}
928			if (g_mirror_disconnect_on_failure &&
929			    g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1)
930			{
931				sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
932				g_mirror_event_send(disk,
933				    G_MIRROR_DISK_STATE_DISCONNECTED,
934				    G_MIRROR_EVENT_DONTWAIT);
935			}
936		}
937		switch (pbp->bio_cmd) {
938		case BIO_DELETE:
939		case BIO_WRITE:
940			pbp->bio_inbed--;
941			pbp->bio_children--;
942			break;
943		}
944	}
945	g_destroy_bio(bp);
946
947	switch (pbp->bio_cmd) {
948	case BIO_READ:
949		if (pbp->bio_inbed < pbp->bio_children)
950			break;
951		if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1)
952			g_io_deliver(pbp, pbp->bio_error);
953		else {
954			pbp->bio_error = 0;
955			mtx_lock(&sc->sc_queue_mtx);
956			bioq_disksort(&sc->sc_queue, pbp);
957			mtx_unlock(&sc->sc_queue_mtx);
958			G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
959			wakeup(sc);
960		}
961		break;
962	case BIO_DELETE:
963	case BIO_WRITE:
964		if (pbp->bio_children == 0) {
965			/*
966			 * All requests failed.
967			 */
968		} else if (pbp->bio_inbed < pbp->bio_children) {
969			/* Do nothing. */
970			break;
971		} else if (pbp->bio_children == pbp->bio_inbed) {
972			/* Some requests succeeded. */
973			pbp->bio_error = 0;
974			pbp->bio_completed = pbp->bio_length;
975		}
976		bioq_remove(&sc->sc_inflight, pbp);
977		/* Release delayed sync requests if possible. */
978		g_mirror_sync_release(sc);
979		g_io_deliver(pbp, pbp->bio_error);
980		break;
981	default:
982		KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd));
983		break;
984	}
985}
986
987static void
988g_mirror_sync_done(struct bio *bp)
989{
990	struct g_mirror_softc *sc;
991
992	G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered.");
993	sc = bp->bio_from->geom->softc;
994	bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC;
995	mtx_lock(&sc->sc_queue_mtx);
996	bioq_disksort(&sc->sc_queue, bp);
997	mtx_unlock(&sc->sc_queue_mtx);
998	wakeup(sc);
999}
1000
1001static void
1002g_mirror_kernel_dump(struct bio *bp)
1003{
1004	struct g_mirror_softc *sc;
1005	struct g_mirror_disk *disk;
1006	struct bio *cbp;
1007	struct g_kerneldump *gkd;
1008
1009	/*
1010	 * We configure dumping to the first component, because this component
1011	 * will be used for reading with 'prefer' balance algorithm.
1012	 * If the component with the higest priority is currently disconnected
1013	 * we will not be able to read the dump after the reboot if it will be
1014	 * connected and synchronized later. Can we do something better?
1015	 */
1016	sc = bp->bio_to->geom->softc;
1017	disk = LIST_FIRST(&sc->sc_disks);
1018
1019	gkd = (struct g_kerneldump *)bp->bio_data;
1020	if (gkd->length > bp->bio_to->mediasize)
1021		gkd->length = bp->bio_to->mediasize;
1022	cbp = g_clone_bio(bp);
1023	if (cbp == NULL) {
1024		g_io_deliver(bp, ENOMEM);
1025		return;
1026	}
1027	cbp->bio_done = g_std_done;
1028	g_io_request(cbp, disk->d_consumer);
1029	G_MIRROR_DEBUG(1, "Kernel dump will go to %s.",
1030	    g_mirror_get_diskname(disk));
1031}
1032
1033static void
1034g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp)
1035{
1036	struct bio_queue_head queue;
1037	struct g_mirror_disk *disk;
1038	struct g_consumer *cp;
1039	struct bio *cbp;
1040
1041	bioq_init(&queue);
1042	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1043		if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1044			continue;
1045		cbp = g_clone_bio(bp);
1046		if (cbp == NULL) {
1047			for (cbp = bioq_first(&queue); cbp != NULL;
1048			    cbp = bioq_first(&queue)) {
1049				bioq_remove(&queue, cbp);
1050				g_destroy_bio(cbp);
1051			}
1052			if (bp->bio_error == 0)
1053				bp->bio_error = ENOMEM;
1054			g_io_deliver(bp, bp->bio_error);
1055			return;
1056		}
1057		bioq_insert_tail(&queue, cbp);
1058		cbp->bio_done = g_std_done;
1059		cbp->bio_caller1 = disk;
1060		cbp->bio_to = disk->d_consumer->provider;
1061	}
1062	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
1063		bioq_remove(&queue, cbp);
1064		G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1065		disk = cbp->bio_caller1;
1066		cbp->bio_caller1 = NULL;
1067		cp = disk->d_consumer;
1068		KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1069		    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1070		    cp->acr, cp->acw, cp->ace));
1071		g_io_request(cbp, disk->d_consumer);
1072	}
1073}
1074
1075static void
1076g_mirror_start(struct bio *bp)
1077{
1078	struct g_mirror_softc *sc;
1079
1080	sc = bp->bio_to->geom->softc;
1081	/*
1082	 * If sc == NULL or there are no valid disks, provider's error
1083	 * should be set and g_mirror_start() should not be called at all.
1084	 */
1085	KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
1086	    ("Provider's error should be set (error=%d)(mirror=%s).",
1087	    bp->bio_to->error, bp->bio_to->name));
1088	G_MIRROR_LOGREQ(3, bp, "Request received.");
1089
1090	switch (bp->bio_cmd) {
1091	case BIO_READ:
1092	case BIO_WRITE:
1093	case BIO_DELETE:
1094		break;
1095	case BIO_FLUSH:
1096		g_mirror_flush(sc, bp);
1097		return;
1098	case BIO_GETATTR:
1099		if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
1100			g_mirror_kernel_dump(bp);
1101			return;
1102		}
1103		/* FALLTHROUGH */
1104	default:
1105		g_io_deliver(bp, EOPNOTSUPP);
1106		return;
1107	}
1108	mtx_lock(&sc->sc_queue_mtx);
1109	bioq_disksort(&sc->sc_queue, bp);
1110	mtx_unlock(&sc->sc_queue_mtx);
1111	G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1112	wakeup(sc);
1113}
1114
1115/*
1116 * Return TRUE if the given request is colliding with a in-progress
1117 * synchronization request.
1118 */
1119static int
1120g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp)
1121{
1122	struct g_mirror_disk *disk;
1123	struct bio *sbp;
1124	off_t rstart, rend, sstart, send;
1125	int i;
1126
1127	if (sc->sc_sync.ds_ndisks == 0)
1128		return (0);
1129	rstart = bp->bio_offset;
1130	rend = bp->bio_offset + bp->bio_length;
1131	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1132		if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING)
1133			continue;
1134		for (i = 0; i < g_mirror_syncreqs; i++) {
1135			sbp = disk->d_sync.ds_bios[i];
1136			if (sbp == NULL)
1137				continue;
1138			sstart = sbp->bio_offset;
1139			send = sbp->bio_offset + sbp->bio_length;
1140			if (rend > sstart && rstart < send)
1141				return (1);
1142		}
1143	}
1144	return (0);
1145}
1146
1147/*
1148 * Return TRUE if the given sync request is colliding with a in-progress regular
1149 * request.
1150 */
1151static int
1152g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp)
1153{
1154	off_t rstart, rend, sstart, send;
1155	struct bio *bp;
1156
1157	if (sc->sc_sync.ds_ndisks == 0)
1158		return (0);
1159	sstart = sbp->bio_offset;
1160	send = sbp->bio_offset + sbp->bio_length;
1161	TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) {
1162		rstart = bp->bio_offset;
1163		rend = bp->bio_offset + bp->bio_length;
1164		if (rend > sstart && rstart < send)
1165			return (1);
1166	}
1167	return (0);
1168}
1169
1170/*
1171 * Puts request onto delayed queue.
1172 */
1173static void
1174g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp)
1175{
1176
1177	G_MIRROR_LOGREQ(2, bp, "Delaying request.");
1178	bioq_insert_head(&sc->sc_regular_delayed, bp);
1179}
1180
1181/*
1182 * Puts synchronization request onto delayed queue.
1183 */
1184static void
1185g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp)
1186{
1187
1188	G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request.");
1189	bioq_insert_tail(&sc->sc_sync_delayed, bp);
1190}
1191
1192/*
1193 * Releases delayed regular requests which don't collide anymore with sync
1194 * requests.
1195 */
1196static void
1197g_mirror_regular_release(struct g_mirror_softc *sc)
1198{
1199	struct bio *bp, *bp2;
1200
1201	TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) {
1202		if (g_mirror_sync_collision(sc, bp))
1203			continue;
1204		bioq_remove(&sc->sc_regular_delayed, bp);
1205		G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp);
1206		mtx_lock(&sc->sc_queue_mtx);
1207		bioq_insert_head(&sc->sc_queue, bp);
1208#if 0
1209		/*
1210		 * wakeup() is not needed, because this function is called from
1211		 * the worker thread.
1212		 */
1213		wakeup(&sc->sc_queue);
1214#endif
1215		mtx_unlock(&sc->sc_queue_mtx);
1216	}
1217}
1218
1219/*
1220 * Releases delayed sync requests which don't collide anymore with regular
1221 * requests.
1222 */
1223static void
1224g_mirror_sync_release(struct g_mirror_softc *sc)
1225{
1226	struct bio *bp, *bp2;
1227
1228	TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) {
1229		if (g_mirror_regular_collision(sc, bp))
1230			continue;
1231		bioq_remove(&sc->sc_sync_delayed, bp);
1232		G_MIRROR_LOGREQ(2, bp,
1233		    "Releasing delayed synchronization request.");
1234		g_io_request(bp, bp->bio_from);
1235	}
1236}
1237
1238/*
1239 * Handle synchronization requests.
1240 * Every synchronization request is two-steps process: first, READ request is
1241 * send to active provider and then WRITE request (with read data) to the provider
1242 * beeing synchronized. When WRITE is finished, new synchronization request is
1243 * send.
1244 */
1245static void
1246g_mirror_sync_request(struct bio *bp)
1247{
1248	struct g_mirror_softc *sc;
1249	struct g_mirror_disk *disk;
1250
1251	bp->bio_from->index--;
1252	sc = bp->bio_from->geom->softc;
1253	disk = bp->bio_from->private;
1254	if (disk == NULL) {
1255		sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
1256		g_topology_lock();
1257		g_mirror_kill_consumer(sc, bp->bio_from);
1258		g_topology_unlock();
1259		free(bp->bio_data, M_MIRROR);
1260		g_destroy_bio(bp);
1261		sx_xlock(&sc->sc_lock);
1262		return;
1263	}
1264
1265	/*
1266	 * Synchronization request.
1267	 */
1268	switch (bp->bio_cmd) {
1269	case BIO_READ:
1270	    {
1271		struct g_consumer *cp;
1272
1273		if (bp->bio_error != 0) {
1274			G_MIRROR_LOGREQ(0, bp,
1275			    "Synchronization request failed (error=%d).",
1276			    bp->bio_error);
1277			g_destroy_bio(bp);
1278			return;
1279		}
1280		G_MIRROR_LOGREQ(3, bp,
1281		    "Synchronization request half-finished.");
1282		bp->bio_cmd = BIO_WRITE;
1283		bp->bio_cflags = 0;
1284		cp = disk->d_consumer;
1285		KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1286		    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1287		    cp->acr, cp->acw, cp->ace));
1288		cp->index++;
1289		g_io_request(bp, cp);
1290		return;
1291	    }
1292	case BIO_WRITE:
1293	    {
1294		struct g_mirror_disk_sync *sync;
1295		off_t offset;
1296		void *data;
1297		int i;
1298
1299		if (bp->bio_error != 0) {
1300			G_MIRROR_LOGREQ(0, bp,
1301			    "Synchronization request failed (error=%d).",
1302			    bp->bio_error);
1303			g_destroy_bio(bp);
1304			sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
1305			g_mirror_event_send(disk,
1306			    G_MIRROR_DISK_STATE_DISCONNECTED,
1307			    G_MIRROR_EVENT_DONTWAIT);
1308			return;
1309		}
1310		G_MIRROR_LOGREQ(3, bp, "Synchronization request finished.");
1311		sync = &disk->d_sync;
1312		if (sync->ds_offset == sc->sc_mediasize ||
1313		    sync->ds_consumer == NULL ||
1314		    (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1315			/* Don't send more synchronization requests. */
1316			sync->ds_inflight--;
1317			if (sync->ds_bios != NULL) {
1318				i = (int)(uintptr_t)bp->bio_caller1;
1319				sync->ds_bios[i] = NULL;
1320			}
1321			free(bp->bio_data, M_MIRROR);
1322			g_destroy_bio(bp);
1323			if (sync->ds_inflight > 0)
1324				return;
1325			if (sync->ds_consumer == NULL ||
1326			    (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1327				return;
1328			}
1329			/* Disk up-to-date, activate it. */
1330			g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE,
1331			    G_MIRROR_EVENT_DONTWAIT);
1332			return;
1333		}
1334
1335		/* Send next synchronization request. */
1336		data = bp->bio_data;
1337		bzero(bp, sizeof(*bp));
1338		bp->bio_cmd = BIO_READ;
1339		bp->bio_offset = sync->ds_offset;
1340		bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
1341		sync->ds_offset += bp->bio_length;
1342		bp->bio_done = g_mirror_sync_done;
1343		bp->bio_data = data;
1344		bp->bio_from = sync->ds_consumer;
1345		bp->bio_to = sc->sc_provider;
1346		G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
1347		sync->ds_consumer->index++;
1348		/*
1349		 * Delay the request if it is colliding with a regular request.
1350		 */
1351		if (g_mirror_regular_collision(sc, bp))
1352			g_mirror_sync_delay(sc, bp);
1353		else
1354			g_io_request(bp, sync->ds_consumer);
1355
1356		/* Release delayed requests if possible. */
1357		g_mirror_regular_release(sc);
1358
1359		/* Find the smallest offset */
1360		offset = sc->sc_mediasize;
1361		for (i = 0; i < g_mirror_syncreqs; i++) {
1362			bp = sync->ds_bios[i];
1363			if (bp->bio_offset < offset)
1364				offset = bp->bio_offset;
1365		}
1366		if (sync->ds_offset_done + (MAXPHYS * 100) < offset) {
1367			/* Update offset_done on every 100 blocks. */
1368			sync->ds_offset_done = offset;
1369			g_mirror_update_metadata(disk);
1370		}
1371		return;
1372	    }
1373	default:
1374		KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1375		    bp->bio_cmd, sc->sc_name));
1376		break;
1377	}
1378}
1379
1380static void
1381g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp)
1382{
1383	struct g_mirror_disk *disk;
1384	struct g_consumer *cp;
1385	struct bio *cbp;
1386
1387	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1388		if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE)
1389			break;
1390	}
1391	if (disk == NULL) {
1392		if (bp->bio_error == 0)
1393			bp->bio_error = ENXIO;
1394		g_io_deliver(bp, bp->bio_error);
1395		return;
1396	}
1397	cbp = g_clone_bio(bp);
1398	if (cbp == NULL) {
1399		if (bp->bio_error == 0)
1400			bp->bio_error = ENOMEM;
1401		g_io_deliver(bp, bp->bio_error);
1402		return;
1403	}
1404	/*
1405	 * Fill in the component buf structure.
1406	 */
1407	cp = disk->d_consumer;
1408	cbp->bio_done = g_mirror_done;
1409	cbp->bio_to = cp->provider;
1410	G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1411	KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1412	    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1413	    cp->acw, cp->ace));
1414	cp->index++;
1415	g_io_request(cbp, cp);
1416}
1417
1418static void
1419g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp)
1420{
1421	struct g_mirror_disk *disk;
1422	struct g_consumer *cp;
1423	struct bio *cbp;
1424
1425	disk = g_mirror_get_disk(sc);
1426	if (disk == NULL) {
1427		if (bp->bio_error == 0)
1428			bp->bio_error = ENXIO;
1429		g_io_deliver(bp, bp->bio_error);
1430		return;
1431	}
1432	cbp = g_clone_bio(bp);
1433	if (cbp == NULL) {
1434		if (bp->bio_error == 0)
1435			bp->bio_error = ENOMEM;
1436		g_io_deliver(bp, bp->bio_error);
1437		return;
1438	}
1439	/*
1440	 * Fill in the component buf structure.
1441	 */
1442	cp = disk->d_consumer;
1443	cbp->bio_done = g_mirror_done;
1444	cbp->bio_to = cp->provider;
1445	G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1446	KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1447	    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1448	    cp->acw, cp->ace));
1449	cp->index++;
1450	g_io_request(cbp, cp);
1451}
1452
1453#define TRACK_SIZE  (1 * 1024 * 1024)
1454#define LOAD_SCALE	256
1455#define ABS(x)		(((x) >= 0) ? (x) : (-(x)))
1456
1457static void
1458g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp)
1459{
1460	struct g_mirror_disk *disk, *dp;
1461	struct g_consumer *cp;
1462	struct bio *cbp;
1463	int prio, best;
1464
1465	/* Find a disk with the smallest load. */
1466	disk = NULL;
1467	best = INT_MAX;
1468	LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1469		if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1470			continue;
1471		prio = dp->load;
1472		/* If disk head is precisely in position - highly prefer it. */
1473		if (dp->d_last_offset == bp->bio_offset)
1474			prio -= 2 * LOAD_SCALE;
1475		else
1476		/* If disk head is close to position - prefer it. */
1477		if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE)
1478			prio -= 1 * LOAD_SCALE;
1479		if (prio <= best) {
1480			disk = dp;
1481			best = prio;
1482		}
1483	}
1484	KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name));
1485	cbp = g_clone_bio(bp);
1486	if (cbp == NULL) {
1487		if (bp->bio_error == 0)
1488			bp->bio_error = ENOMEM;
1489		g_io_deliver(bp, bp->bio_error);
1490		return;
1491	}
1492	/*
1493	 * Fill in the component buf structure.
1494	 */
1495	cp = disk->d_consumer;
1496	cbp->bio_done = g_mirror_done;
1497	cbp->bio_to = cp->provider;
1498	G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1499	KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1500	    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
1501	    cp->acw, cp->ace));
1502	cp->index++;
1503	/* Remember last head position */
1504	disk->d_last_offset = bp->bio_offset + bp->bio_length;
1505	/* Update loads. */
1506	LIST_FOREACH(dp, &sc->sc_disks, d_next) {
1507		dp->load = (dp->d_consumer->index * LOAD_SCALE +
1508		    dp->load * 7) / 8;
1509	}
1510	g_io_request(cbp, cp);
1511}
1512
1513static void
1514g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp)
1515{
1516	struct bio_queue_head queue;
1517	struct g_mirror_disk *disk;
1518	struct g_consumer *cp;
1519	struct bio *cbp;
1520	off_t left, mod, offset, slice;
1521	u_char *data;
1522	u_int ndisks;
1523
1524	if (bp->bio_length <= sc->sc_slice) {
1525		g_mirror_request_round_robin(sc, bp);
1526		return;
1527	}
1528	ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE);
1529	slice = bp->bio_length / ndisks;
1530	mod = slice % sc->sc_provider->sectorsize;
1531	if (mod != 0)
1532		slice += sc->sc_provider->sectorsize - mod;
1533	/*
1534	 * Allocate all bios before sending any request, so we can
1535	 * return ENOMEM in nice and clean way.
1536	 */
1537	left = bp->bio_length;
1538	offset = bp->bio_offset;
1539	data = bp->bio_data;
1540	bioq_init(&queue);
1541	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1542		if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
1543			continue;
1544		cbp = g_clone_bio(bp);
1545		if (cbp == NULL) {
1546			for (cbp = bioq_first(&queue); cbp != NULL;
1547			    cbp = bioq_first(&queue)) {
1548				bioq_remove(&queue, cbp);
1549				g_destroy_bio(cbp);
1550			}
1551			if (bp->bio_error == 0)
1552				bp->bio_error = ENOMEM;
1553			g_io_deliver(bp, bp->bio_error);
1554			return;
1555		}
1556		bioq_insert_tail(&queue, cbp);
1557		cbp->bio_done = g_mirror_done;
1558		cbp->bio_caller1 = disk;
1559		cbp->bio_to = disk->d_consumer->provider;
1560		cbp->bio_offset = offset;
1561		cbp->bio_data = data;
1562		cbp->bio_length = MIN(left, slice);
1563		left -= cbp->bio_length;
1564		if (left == 0)
1565			break;
1566		offset += cbp->bio_length;
1567		data += cbp->bio_length;
1568	}
1569	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
1570		bioq_remove(&queue, cbp);
1571		G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1572		disk = cbp->bio_caller1;
1573		cbp->bio_caller1 = NULL;
1574		cp = disk->d_consumer;
1575		KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1576		    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1577		    cp->acr, cp->acw, cp->ace));
1578		disk->d_consumer->index++;
1579		g_io_request(cbp, disk->d_consumer);
1580	}
1581}
1582
1583static void
1584g_mirror_register_request(struct bio *bp)
1585{
1586	struct g_mirror_softc *sc;
1587
1588	sc = bp->bio_to->geom->softc;
1589	switch (bp->bio_cmd) {
1590	case BIO_READ:
1591		switch (sc->sc_balance) {
1592		case G_MIRROR_BALANCE_LOAD:
1593			g_mirror_request_load(sc, bp);
1594			break;
1595		case G_MIRROR_BALANCE_PREFER:
1596			g_mirror_request_prefer(sc, bp);
1597			break;
1598		case G_MIRROR_BALANCE_ROUND_ROBIN:
1599			g_mirror_request_round_robin(sc, bp);
1600			break;
1601		case G_MIRROR_BALANCE_SPLIT:
1602			g_mirror_request_split(sc, bp);
1603			break;
1604		}
1605		return;
1606	case BIO_WRITE:
1607	case BIO_DELETE:
1608	    {
1609		struct g_mirror_disk *disk;
1610		struct g_mirror_disk_sync *sync;
1611		struct bio_queue_head queue;
1612		struct g_consumer *cp;
1613		struct bio *cbp;
1614
1615		/*
1616		 * Delay the request if it is colliding with a synchronization
1617		 * request.
1618		 */
1619		if (g_mirror_sync_collision(sc, bp)) {
1620			g_mirror_regular_delay(sc, bp);
1621			return;
1622		}
1623
1624		if (sc->sc_idle)
1625			g_mirror_unidle(sc);
1626		else
1627			sc->sc_last_write = time_uptime;
1628
1629		/*
1630		 * Allocate all bios before sending any request, so we can
1631		 * return ENOMEM in nice and clean way.
1632		 */
1633		bioq_init(&queue);
1634		LIST_FOREACH(disk, &sc->sc_disks, d_next) {
1635			sync = &disk->d_sync;
1636			switch (disk->d_state) {
1637			case G_MIRROR_DISK_STATE_ACTIVE:
1638				break;
1639			case G_MIRROR_DISK_STATE_SYNCHRONIZING:
1640				if (bp->bio_offset >= sync->ds_offset)
1641					continue;
1642				break;
1643			default:
1644				continue;
1645			}
1646			cbp = g_clone_bio(bp);
1647			if (cbp == NULL) {
1648				for (cbp = bioq_first(&queue); cbp != NULL;
1649				    cbp = bioq_first(&queue)) {
1650					bioq_remove(&queue, cbp);
1651					g_destroy_bio(cbp);
1652				}
1653				if (bp->bio_error == 0)
1654					bp->bio_error = ENOMEM;
1655				g_io_deliver(bp, bp->bio_error);
1656				return;
1657			}
1658			bioq_insert_tail(&queue, cbp);
1659			cbp->bio_done = g_mirror_done;
1660			cp = disk->d_consumer;
1661			cbp->bio_caller1 = cp;
1662			cbp->bio_to = cp->provider;
1663			KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1664			    ("Consumer %s not opened (r%dw%de%d).",
1665			    cp->provider->name, cp->acr, cp->acw, cp->ace));
1666		}
1667		for (cbp = bioq_first(&queue); cbp != NULL;
1668		    cbp = bioq_first(&queue)) {
1669			bioq_remove(&queue, cbp);
1670			G_MIRROR_LOGREQ(3, cbp, "Sending request.");
1671			cp = cbp->bio_caller1;
1672			cbp->bio_caller1 = NULL;
1673			cp->index++;
1674			sc->sc_writes++;
1675			g_io_request(cbp, cp);
1676		}
1677		/*
1678		 * Put request onto inflight queue, so we can check if new
1679		 * synchronization requests don't collide with it.
1680		 */
1681		bioq_insert_tail(&sc->sc_inflight, bp);
1682		/*
1683		 * Bump syncid on first write.
1684		 */
1685		if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) {
1686			sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
1687			g_mirror_bump_syncid(sc);
1688		}
1689		return;
1690	    }
1691	default:
1692		KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1693		    bp->bio_cmd, sc->sc_name));
1694		break;
1695	}
1696}
1697
1698static int
1699g_mirror_can_destroy(struct g_mirror_softc *sc)
1700{
1701	struct g_geom *gp;
1702	struct g_consumer *cp;
1703
1704	g_topology_assert();
1705	gp = sc->sc_geom;
1706	if (gp->softc == NULL)
1707		return (1);
1708	LIST_FOREACH(cp, &gp->consumer, consumer) {
1709		if (g_mirror_is_busy(sc, cp))
1710			return (0);
1711	}
1712	gp = sc->sc_sync.ds_geom;
1713	LIST_FOREACH(cp, &gp->consumer, consumer) {
1714		if (g_mirror_is_busy(sc, cp))
1715			return (0);
1716	}
1717	G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
1718	    sc->sc_name);
1719	return (1);
1720}
1721
1722static int
1723g_mirror_try_destroy(struct g_mirror_softc *sc)
1724{
1725
1726	if (sc->sc_rootmount != NULL) {
1727		G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
1728		    sc->sc_rootmount);
1729		root_mount_rel(sc->sc_rootmount);
1730		sc->sc_rootmount = NULL;
1731	}
1732	g_topology_lock();
1733	if (!g_mirror_can_destroy(sc)) {
1734		g_topology_unlock();
1735		return (0);
1736	}
1737	sc->sc_geom->softc = NULL;
1738	sc->sc_sync.ds_geom->softc = NULL;
1739	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) {
1740		g_topology_unlock();
1741		G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1742		    &sc->sc_worker);
1743		/* Unlock sc_lock here, as it can be destroyed after wakeup. */
1744		sx_xunlock(&sc->sc_lock);
1745		wakeup(&sc->sc_worker);
1746		sc->sc_worker = NULL;
1747	} else {
1748		g_topology_unlock();
1749		g_mirror_destroy_device(sc);
1750		free(sc, M_MIRROR);
1751	}
1752	return (1);
1753}
1754
1755/*
1756 * Worker thread.
1757 */
1758static void
1759g_mirror_worker(void *arg)
1760{
1761	struct g_mirror_softc *sc;
1762	struct g_mirror_event *ep;
1763	struct bio *bp;
1764	int timeout;
1765
1766	sc = arg;
1767	thread_lock(curthread);
1768	sched_prio(curthread, PRIBIO);
1769	thread_unlock(curthread);
1770
1771	sx_xlock(&sc->sc_lock);
1772	for (;;) {
1773		G_MIRROR_DEBUG(5, "%s: Let's see...", __func__);
1774		/*
1775		 * First take a look at events.
1776		 * This is important to handle events before any I/O requests.
1777		 */
1778		ep = g_mirror_event_get(sc);
1779		if (ep != NULL) {
1780			g_mirror_event_remove(sc, ep);
1781			if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) {
1782				/* Update only device status. */
1783				G_MIRROR_DEBUG(3,
1784				    "Running event for device %s.",
1785				    sc->sc_name);
1786				ep->e_error = 0;
1787				g_mirror_update_device(sc, 1);
1788			} else {
1789				/* Update disk status. */
1790				G_MIRROR_DEBUG(3, "Running event for disk %s.",
1791				     g_mirror_get_diskname(ep->e_disk));
1792				ep->e_error = g_mirror_update_disk(ep->e_disk,
1793				    ep->e_state);
1794				if (ep->e_error == 0)
1795					g_mirror_update_device(sc, 0);
1796			}
1797			if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) {
1798				KASSERT(ep->e_error == 0,
1799				    ("Error cannot be handled."));
1800				g_mirror_event_free(ep);
1801			} else {
1802				ep->e_flags |= G_MIRROR_EVENT_DONE;
1803				G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
1804				    ep);
1805				mtx_lock(&sc->sc_events_mtx);
1806				wakeup(ep);
1807				mtx_unlock(&sc->sc_events_mtx);
1808			}
1809			if ((sc->sc_flags &
1810			    G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1811				if (g_mirror_try_destroy(sc)) {
1812					curthread->td_pflags &= ~TDP_GEOM;
1813					G_MIRROR_DEBUG(1, "Thread exiting.");
1814					kproc_exit(0);
1815				}
1816			}
1817			G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__);
1818			continue;
1819		}
1820		/*
1821		 * Check if we can mark array as CLEAN and if we can't take
1822		 * how much seconds should we wait.
1823		 */
1824		timeout = g_mirror_idle(sc, -1);
1825		/*
1826		 * Now I/O requests.
1827		 */
1828		/* Get first request from the queue. */
1829		mtx_lock(&sc->sc_queue_mtx);
1830		bp = bioq_first(&sc->sc_queue);
1831		if (bp == NULL) {
1832			if ((sc->sc_flags &
1833			    G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
1834				mtx_unlock(&sc->sc_queue_mtx);
1835				if (g_mirror_try_destroy(sc)) {
1836					curthread->td_pflags &= ~TDP_GEOM;
1837					G_MIRROR_DEBUG(1, "Thread exiting.");
1838					kproc_exit(0);
1839				}
1840				mtx_lock(&sc->sc_queue_mtx);
1841			}
1842			sx_xunlock(&sc->sc_lock);
1843			/*
1844			 * XXX: We can miss an event here, because an event
1845			 *      can be added without sx-device-lock and without
1846			 *      mtx-queue-lock. Maybe I should just stop using
1847			 *      dedicated mutex for events synchronization and
1848			 *      stick with the queue lock?
1849			 *      The event will hang here until next I/O request
1850			 *      or next event is received.
1851			 */
1852			MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1",
1853			    timeout * hz);
1854			sx_xlock(&sc->sc_lock);
1855			G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__);
1856			continue;
1857		}
1858		bioq_remove(&sc->sc_queue, bp);
1859		mtx_unlock(&sc->sc_queue_mtx);
1860
1861		if (bp->bio_from->geom == sc->sc_sync.ds_geom &&
1862		    (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) {
1863			g_mirror_sync_request(bp);	/* READ */
1864		} else if (bp->bio_to != sc->sc_provider) {
1865			if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0)
1866				g_mirror_regular_request(bp);
1867			else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
1868				g_mirror_sync_request(bp);	/* WRITE */
1869			else {
1870				KASSERT(0,
1871				    ("Invalid request cflags=0x%hhx to=%s.",
1872				    bp->bio_cflags, bp->bio_to->name));
1873			}
1874		} else {
1875			g_mirror_register_request(bp);
1876		}
1877		G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__);
1878	}
1879}
1880
1881static void
1882g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
1883{
1884
1885	sx_assert(&sc->sc_lock, SX_LOCKED);
1886
1887	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
1888		return;
1889	if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) {
1890		G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.",
1891		    g_mirror_get_diskname(disk), sc->sc_name);
1892		disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
1893	} else if (sc->sc_idle &&
1894	    (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
1895		G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.",
1896		    g_mirror_get_diskname(disk), sc->sc_name);
1897		disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
1898	}
1899}
1900
1901static void
1902g_mirror_sync_start(struct g_mirror_disk *disk)
1903{
1904	struct g_mirror_softc *sc;
1905	struct g_consumer *cp;
1906	struct bio *bp;
1907	int error, i;
1908
1909	g_topology_assert_not();
1910	sc = disk->d_softc;
1911	sx_assert(&sc->sc_lock, SX_LOCKED);
1912
1913	KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
1914	    ("Disk %s is not marked for synchronization.",
1915	    g_mirror_get_diskname(disk)));
1916	KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
1917	    ("Device not in RUNNING state (%s, %u).", sc->sc_name,
1918	    sc->sc_state));
1919
1920	sx_xunlock(&sc->sc_lock);
1921	g_topology_lock();
1922	cp = g_new_consumer(sc->sc_sync.ds_geom);
1923	error = g_attach(cp, sc->sc_provider);
1924	KASSERT(error == 0,
1925	    ("Cannot attach to %s (error=%d).", sc->sc_name, error));
1926	error = g_access(cp, 1, 0, 0);
1927	KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error));
1928	g_topology_unlock();
1929	sx_xlock(&sc->sc_lock);
1930
1931	G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
1932	    g_mirror_get_diskname(disk));
1933	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0)
1934		disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
1935	KASSERT(disk->d_sync.ds_consumer == NULL,
1936	    ("Sync consumer already exists (device=%s, disk=%s).",
1937	    sc->sc_name, g_mirror_get_diskname(disk)));
1938
1939	disk->d_sync.ds_consumer = cp;
1940	disk->d_sync.ds_consumer->private = disk;
1941	disk->d_sync.ds_consumer->index = 0;
1942
1943	/*
1944	 * Allocate memory for synchronization bios and initialize them.
1945	 */
1946	disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs,
1947	    M_MIRROR, M_WAITOK);
1948	for (i = 0; i < g_mirror_syncreqs; i++) {
1949		bp = g_alloc_bio();
1950		disk->d_sync.ds_bios[i] = bp;
1951		bp->bio_parent = NULL;
1952		bp->bio_cmd = BIO_READ;
1953		bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK);
1954		bp->bio_cflags = 0;
1955		bp->bio_offset = disk->d_sync.ds_offset;
1956		bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
1957		disk->d_sync.ds_offset += bp->bio_length;
1958		bp->bio_done = g_mirror_sync_done;
1959		bp->bio_from = disk->d_sync.ds_consumer;
1960		bp->bio_to = sc->sc_provider;
1961		bp->bio_caller1 = (void *)(uintptr_t)i;
1962	}
1963
1964	/* Increase the number of disks in SYNCHRONIZING state. */
1965	sc->sc_sync.ds_ndisks++;
1966	/* Set the number of in-flight synchronization requests. */
1967	disk->d_sync.ds_inflight = g_mirror_syncreqs;
1968
1969	/*
1970	 * Fire off first synchronization requests.
1971	 */
1972	for (i = 0; i < g_mirror_syncreqs; i++) {
1973		bp = disk->d_sync.ds_bios[i];
1974		G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
1975		disk->d_sync.ds_consumer->index++;
1976		/*
1977		 * Delay the request if it is colliding with a regular request.
1978		 */
1979		if (g_mirror_regular_collision(sc, bp))
1980			g_mirror_sync_delay(sc, bp);
1981		else
1982			g_io_request(bp, disk->d_sync.ds_consumer);
1983	}
1984}
1985
1986/*
1987 * Stop synchronization process.
1988 * type: 0 - synchronization finished
1989 *       1 - synchronization stopped
1990 */
1991static void
1992g_mirror_sync_stop(struct g_mirror_disk *disk, int type)
1993{
1994	struct g_mirror_softc *sc;
1995	struct g_consumer *cp;
1996
1997	g_topology_assert_not();
1998	sc = disk->d_softc;
1999	sx_assert(&sc->sc_lock, SX_LOCKED);
2000
2001	KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2002	    ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2003	    g_mirror_disk_state2str(disk->d_state)));
2004	if (disk->d_sync.ds_consumer == NULL)
2005		return;
2006
2007	if (type == 0) {
2008		G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.",
2009		    sc->sc_name, g_mirror_get_diskname(disk));
2010	} else /* if (type == 1) */ {
2011		G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
2012		    sc->sc_name, g_mirror_get_diskname(disk));
2013	}
2014	free(disk->d_sync.ds_bios, M_MIRROR);
2015	disk->d_sync.ds_bios = NULL;
2016	cp = disk->d_sync.ds_consumer;
2017	disk->d_sync.ds_consumer = NULL;
2018	disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2019	sc->sc_sync.ds_ndisks--;
2020	sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
2021	g_topology_lock();
2022	g_mirror_kill_consumer(sc, cp);
2023	g_topology_unlock();
2024	sx_xlock(&sc->sc_lock);
2025}
2026
2027static void
2028g_mirror_launch_provider(struct g_mirror_softc *sc)
2029{
2030	struct g_mirror_disk *disk;
2031	struct g_provider *pp;
2032
2033	sx_assert(&sc->sc_lock, SX_LOCKED);
2034
2035	g_topology_lock();
2036	pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name);
2037	pp->mediasize = sc->sc_mediasize;
2038	pp->sectorsize = sc->sc_sectorsize;
2039	pp->stripesize = 0;
2040	pp->stripeoffset = 0;
2041	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2042		if (disk->d_consumer && disk->d_consumer->provider &&
2043		    disk->d_consumer->provider->stripesize > pp->stripesize) {
2044			pp->stripesize = disk->d_consumer->provider->stripesize;
2045			pp->stripeoffset = disk->d_consumer->provider->stripeoffset;
2046		}
2047	}
2048	sc->sc_provider = pp;
2049	g_error_provider(pp, 0);
2050	g_topology_unlock();
2051	G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name,
2052	    g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks);
2053	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2054		if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
2055			g_mirror_sync_start(disk);
2056	}
2057}
2058
2059static void
2060g_mirror_destroy_provider(struct g_mirror_softc *sc)
2061{
2062	struct g_mirror_disk *disk;
2063	struct bio *bp;
2064
2065	g_topology_assert_not();
2066	KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
2067	    sc->sc_name));
2068
2069	g_topology_lock();
2070	g_error_provider(sc->sc_provider, ENXIO);
2071	mtx_lock(&sc->sc_queue_mtx);
2072	while ((bp = bioq_first(&sc->sc_queue)) != NULL) {
2073		bioq_remove(&sc->sc_queue, bp);
2074		g_io_deliver(bp, ENXIO);
2075	}
2076	mtx_unlock(&sc->sc_queue_mtx);
2077	G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name,
2078	    sc->sc_provider->name);
2079	sc->sc_provider->flags |= G_PF_WITHER;
2080	g_orphan_provider(sc->sc_provider, ENXIO);
2081	g_topology_unlock();
2082	sc->sc_provider = NULL;
2083	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2084		if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
2085			g_mirror_sync_stop(disk, 1);
2086	}
2087}
2088
2089static void
2090g_mirror_go(void *arg)
2091{
2092	struct g_mirror_softc *sc;
2093
2094	sc = arg;
2095	G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
2096	g_mirror_event_send(sc, 0,
2097	    G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE);
2098}
2099
2100static u_int
2101g_mirror_determine_state(struct g_mirror_disk *disk)
2102{
2103	struct g_mirror_softc *sc;
2104	u_int state;
2105
2106	sc = disk->d_softc;
2107	if (sc->sc_syncid == disk->d_sync.ds_syncid) {
2108		if ((disk->d_flags &
2109		    G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
2110			/* Disk does not need synchronization. */
2111			state = G_MIRROR_DISK_STATE_ACTIVE;
2112		} else {
2113			if ((sc->sc_flags &
2114			     G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2115			    (disk->d_flags &
2116			     G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
2117				/*
2118				 * We can start synchronization from
2119				 * the stored offset.
2120				 */
2121				state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
2122			} else {
2123				state = G_MIRROR_DISK_STATE_STALE;
2124			}
2125		}
2126	} else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
2127		/*
2128		 * Reset all synchronization data for this disk,
2129		 * because if it even was synchronized, it was
2130		 * synchronized to disks with different syncid.
2131		 */
2132		disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2133		disk->d_sync.ds_offset = 0;
2134		disk->d_sync.ds_offset_done = 0;
2135		disk->d_sync.ds_syncid = sc->sc_syncid;
2136		if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2137		    (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
2138			state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
2139		} else {
2140			state = G_MIRROR_DISK_STATE_STALE;
2141		}
2142	} else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
2143		/*
2144		 * Not good, NOT GOOD!
2145		 * It means that mirror was started on stale disks
2146		 * and more fresh disk just arrive.
2147		 * If there were writes, mirror is broken, sorry.
2148		 * I think the best choice here is don't touch
2149		 * this disk and inform the user loudly.
2150		 */
2151		G_MIRROR_DEBUG(0, "Device %s was started before the freshest "
2152		    "disk (%s) arrives!! It will not be connected to the "
2153		    "running device.", sc->sc_name,
2154		    g_mirror_get_diskname(disk));
2155		g_mirror_destroy_disk(disk);
2156		state = G_MIRROR_DISK_STATE_NONE;
2157		/* Return immediately, because disk was destroyed. */
2158		return (state);
2159	}
2160	G_MIRROR_DEBUG(3, "State for %s disk: %s.",
2161	    g_mirror_get_diskname(disk), g_mirror_disk_state2str(state));
2162	return (state);
2163}
2164
2165/*
2166 * Update device state.
2167 */
2168static void
2169g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force)
2170{
2171	struct g_mirror_disk *disk;
2172	u_int state;
2173
2174	sx_assert(&sc->sc_lock, SX_XLOCKED);
2175
2176	switch (sc->sc_state) {
2177	case G_MIRROR_DEVICE_STATE_STARTING:
2178	    {
2179		struct g_mirror_disk *pdisk, *tdisk;
2180		u_int dirty, ndisks, genid, syncid;
2181
2182		KASSERT(sc->sc_provider == NULL,
2183		    ("Non-NULL provider in STARTING state (%s).", sc->sc_name));
2184		/*
2185		 * Are we ready? We are, if all disks are connected or
2186		 * if we have any disks and 'force' is true.
2187		 */
2188		ndisks = g_mirror_ndisks(sc, -1);
2189		if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) {
2190			;
2191		} else if (ndisks == 0) {
2192			/*
2193			 * Disks went down in starting phase, so destroy
2194			 * device.
2195			 */
2196			callout_drain(&sc->sc_callout);
2197			sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2198			G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2199			    sc->sc_rootmount);
2200			root_mount_rel(sc->sc_rootmount);
2201			sc->sc_rootmount = NULL;
2202			return;
2203		} else {
2204			return;
2205		}
2206
2207		/*
2208		 * Activate all disks with the biggest syncid.
2209		 */
2210		if (force) {
2211			/*
2212			 * If 'force' is true, we have been called due to
2213			 * timeout, so don't bother canceling timeout.
2214			 */
2215			ndisks = 0;
2216			LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2217				if ((disk->d_flags &
2218				    G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
2219					ndisks++;
2220				}
2221			}
2222			if (ndisks == 0) {
2223				/* No valid disks found, destroy device. */
2224				sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2225				G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2226				    __LINE__, sc->sc_rootmount);
2227				root_mount_rel(sc->sc_rootmount);
2228				sc->sc_rootmount = NULL;
2229				return;
2230			}
2231		} else {
2232			/* Cancel timeout. */
2233			callout_drain(&sc->sc_callout);
2234		}
2235
2236		/*
2237		 * Find the biggest genid.
2238		 */
2239		genid = 0;
2240		LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2241			if (disk->d_genid > genid)
2242				genid = disk->d_genid;
2243		}
2244		sc->sc_genid = genid;
2245		/*
2246		 * Remove all disks without the biggest genid.
2247		 */
2248		LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) {
2249			if (disk->d_genid < genid) {
2250				G_MIRROR_DEBUG(0,
2251				    "Component %s (device %s) broken, skipping.",
2252				    g_mirror_get_diskname(disk), sc->sc_name);
2253				g_mirror_destroy_disk(disk);
2254			}
2255		}
2256
2257		/*
2258		 * Find the biggest syncid.
2259		 */
2260		syncid = 0;
2261		LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2262			if (disk->d_sync.ds_syncid > syncid)
2263				syncid = disk->d_sync.ds_syncid;
2264		}
2265
2266		/*
2267		 * Here we need to look for dirty disks and if all disks
2268		 * with the biggest syncid are dirty, we have to choose
2269		 * one with the biggest priority and rebuild the rest.
2270		 */
2271		/*
2272		 * Find the number of dirty disks with the biggest syncid.
2273		 * Find the number of disks with the biggest syncid.
2274		 * While here, find a disk with the biggest priority.
2275		 */
2276		dirty = ndisks = 0;
2277		pdisk = NULL;
2278		LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2279			if (disk->d_sync.ds_syncid != syncid)
2280				continue;
2281			if ((disk->d_flags &
2282			    G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2283				continue;
2284			}
2285			ndisks++;
2286			if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
2287				dirty++;
2288				if (pdisk == NULL ||
2289				    pdisk->d_priority < disk->d_priority) {
2290					pdisk = disk;
2291				}
2292			}
2293		}
2294		if (dirty == 0) {
2295			/* No dirty disks at all, great. */
2296		} else if (dirty == ndisks) {
2297			/*
2298			 * Force synchronization for all dirty disks except one
2299			 * with the biggest priority.
2300			 */
2301			KASSERT(pdisk != NULL, ("pdisk == NULL"));
2302			G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a "
2303			    "master disk for synchronization.",
2304			    g_mirror_get_diskname(pdisk), sc->sc_name);
2305			LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2306				if (disk->d_sync.ds_syncid != syncid)
2307					continue;
2308				if ((disk->d_flags &
2309				    G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2310					continue;
2311				}
2312				KASSERT((disk->d_flags &
2313				    G_MIRROR_DISK_FLAG_DIRTY) != 0,
2314				    ("Disk %s isn't marked as dirty.",
2315				    g_mirror_get_diskname(disk)));
2316				/* Skip the disk with the biggest priority. */
2317				if (disk == pdisk)
2318					continue;
2319				disk->d_sync.ds_syncid = 0;
2320			}
2321		} else if (dirty < ndisks) {
2322			/*
2323			 * Force synchronization for all dirty disks.
2324			 * We have some non-dirty disks.
2325			 */
2326			LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2327				if (disk->d_sync.ds_syncid != syncid)
2328					continue;
2329				if ((disk->d_flags &
2330				    G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
2331					continue;
2332				}
2333				if ((disk->d_flags &
2334				    G_MIRROR_DISK_FLAG_DIRTY) == 0) {
2335					continue;
2336				}
2337				disk->d_sync.ds_syncid = 0;
2338			}
2339		}
2340
2341		/* Reset hint. */
2342		sc->sc_hint = NULL;
2343		sc->sc_syncid = syncid;
2344		if (force) {
2345			/* Remember to bump syncid on first write. */
2346			sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2347		}
2348		state = G_MIRROR_DEVICE_STATE_RUNNING;
2349		G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.",
2350		    sc->sc_name, g_mirror_device_state2str(sc->sc_state),
2351		    g_mirror_device_state2str(state));
2352		sc->sc_state = state;
2353		LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2354			state = g_mirror_determine_state(disk);
2355			g_mirror_event_send(disk, state,
2356			    G_MIRROR_EVENT_DONTWAIT);
2357			if (state == G_MIRROR_DISK_STATE_STALE)
2358				sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
2359		}
2360		break;
2361	    }
2362	case G_MIRROR_DEVICE_STATE_RUNNING:
2363		if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 &&
2364		    g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2365			/*
2366			 * No active disks or no disks at all,
2367			 * so destroy device.
2368			 */
2369			if (sc->sc_provider != NULL)
2370				g_mirror_destroy_provider(sc);
2371			sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2372			break;
2373		} else if (g_mirror_ndisks(sc,
2374		    G_MIRROR_DISK_STATE_ACTIVE) > 0 &&
2375		    g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
2376			/*
2377			 * We have active disks, launch provider if it doesn't
2378			 * exist.
2379			 */
2380			if (sc->sc_provider == NULL)
2381				g_mirror_launch_provider(sc);
2382			if (sc->sc_rootmount != NULL) {
2383				G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
2384				    __LINE__, sc->sc_rootmount);
2385				root_mount_rel(sc->sc_rootmount);
2386				sc->sc_rootmount = NULL;
2387			}
2388		}
2389		/*
2390		 * Genid should be bumped immediately, so do it here.
2391		 */
2392		if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) {
2393			sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID;
2394			g_mirror_bump_genid(sc);
2395		}
2396		break;
2397	default:
2398		KASSERT(1 == 0, ("Wrong device state (%s, %s).",
2399		    sc->sc_name, g_mirror_device_state2str(sc->sc_state)));
2400		break;
2401	}
2402}
2403
2404/*
2405 * Update disk state and device state if needed.
2406 */
2407#define	DISK_STATE_CHANGED()	G_MIRROR_DEBUG(1,			\
2408	"Disk %s state changed from %s to %s (device %s).",		\
2409	g_mirror_get_diskname(disk),					\
2410	g_mirror_disk_state2str(disk->d_state),				\
2411	g_mirror_disk_state2str(state), sc->sc_name)
2412static int
2413g_mirror_update_disk(struct g_mirror_disk *disk, u_int state)
2414{
2415	struct g_mirror_softc *sc;
2416
2417	sc = disk->d_softc;
2418	sx_assert(&sc->sc_lock, SX_XLOCKED);
2419
2420again:
2421	G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.",
2422	    g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state),
2423	    g_mirror_disk_state2str(state));
2424	switch (state) {
2425	case G_MIRROR_DISK_STATE_NEW:
2426		/*
2427		 * Possible scenarios:
2428		 * 1. New disk arrive.
2429		 */
2430		/* Previous state should be NONE. */
2431		KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE,
2432		    ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2433		    g_mirror_disk_state2str(disk->d_state)));
2434		DISK_STATE_CHANGED();
2435
2436		disk->d_state = state;
2437		if (LIST_EMPTY(&sc->sc_disks))
2438			LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next);
2439		else {
2440			struct g_mirror_disk *dp;
2441
2442			LIST_FOREACH(dp, &sc->sc_disks, d_next) {
2443				if (disk->d_priority >= dp->d_priority) {
2444					LIST_INSERT_BEFORE(dp, disk, d_next);
2445					dp = NULL;
2446					break;
2447				}
2448				if (LIST_NEXT(dp, d_next) == NULL)
2449					break;
2450			}
2451			if (dp != NULL)
2452				LIST_INSERT_AFTER(dp, disk, d_next);
2453		}
2454		G_MIRROR_DEBUG(1, "Device %s: provider %s detected.",
2455		    sc->sc_name, g_mirror_get_diskname(disk));
2456		if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
2457			break;
2458		KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2459		    ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2460		    g_mirror_device_state2str(sc->sc_state),
2461		    g_mirror_get_diskname(disk),
2462		    g_mirror_disk_state2str(disk->d_state)));
2463		state = g_mirror_determine_state(disk);
2464		if (state != G_MIRROR_DISK_STATE_NONE)
2465			goto again;
2466		break;
2467	case G_MIRROR_DISK_STATE_ACTIVE:
2468		/*
2469		 * Possible scenarios:
2470		 * 1. New disk does not need synchronization.
2471		 * 2. Synchronization process finished successfully.
2472		 */
2473		KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2474		    ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2475		    g_mirror_device_state2str(sc->sc_state),
2476		    g_mirror_get_diskname(disk),
2477		    g_mirror_disk_state2str(disk->d_state)));
2478		/* Previous state should be NEW or SYNCHRONIZING. */
2479		KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW ||
2480		    disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2481		    ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2482		    g_mirror_disk_state2str(disk->d_state)));
2483		DISK_STATE_CHANGED();
2484
2485		if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
2486			disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING;
2487			disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC;
2488			g_mirror_sync_stop(disk, 0);
2489		}
2490		disk->d_state = state;
2491		disk->d_sync.ds_offset = 0;
2492		disk->d_sync.ds_offset_done = 0;
2493		g_mirror_update_idle(sc, disk);
2494		g_mirror_update_metadata(disk);
2495		G_MIRROR_DEBUG(1, "Device %s: provider %s activated.",
2496		    sc->sc_name, g_mirror_get_diskname(disk));
2497		break;
2498	case G_MIRROR_DISK_STATE_STALE:
2499		/*
2500		 * Possible scenarios:
2501		 * 1. Stale disk was connected.
2502		 */
2503		/* Previous state should be NEW. */
2504		KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2505		    ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2506		    g_mirror_disk_state2str(disk->d_state)));
2507		KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2508		    ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2509		    g_mirror_device_state2str(sc->sc_state),
2510		    g_mirror_get_diskname(disk),
2511		    g_mirror_disk_state2str(disk->d_state)));
2512		/*
2513		 * STALE state is only possible if device is marked
2514		 * NOAUTOSYNC.
2515		 */
2516		KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0,
2517		    ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2518		    g_mirror_device_state2str(sc->sc_state),
2519		    g_mirror_get_diskname(disk),
2520		    g_mirror_disk_state2str(disk->d_state)));
2521		DISK_STATE_CHANGED();
2522
2523		disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2524		disk->d_state = state;
2525		g_mirror_update_metadata(disk);
2526		G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.",
2527		    sc->sc_name, g_mirror_get_diskname(disk));
2528		break;
2529	case G_MIRROR_DISK_STATE_SYNCHRONIZING:
2530		/*
2531		 * Possible scenarios:
2532		 * 1. Disk which needs synchronization was connected.
2533		 */
2534		/* Previous state should be NEW. */
2535		KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2536		    ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
2537		    g_mirror_disk_state2str(disk->d_state)));
2538		KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
2539		    ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2540		    g_mirror_device_state2str(sc->sc_state),
2541		    g_mirror_get_diskname(disk),
2542		    g_mirror_disk_state2str(disk->d_state)));
2543		DISK_STATE_CHANGED();
2544
2545		if (disk->d_state == G_MIRROR_DISK_STATE_NEW)
2546			disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
2547		disk->d_state = state;
2548		if (sc->sc_provider != NULL) {
2549			g_mirror_sync_start(disk);
2550			g_mirror_update_metadata(disk);
2551		}
2552		break;
2553	case G_MIRROR_DISK_STATE_DISCONNECTED:
2554		/*
2555		 * Possible scenarios:
2556		 * 1. Device wasn't running yet, but disk disappear.
2557		 * 2. Disk was active and disapppear.
2558		 * 3. Disk disappear during synchronization process.
2559		 */
2560		if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) {
2561			/*
2562			 * Previous state should be ACTIVE, STALE or
2563			 * SYNCHRONIZING.
2564			 */
2565			KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
2566			    disk->d_state == G_MIRROR_DISK_STATE_STALE ||
2567			    disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
2568			    ("Wrong disk state (%s, %s).",
2569			    g_mirror_get_diskname(disk),
2570			    g_mirror_disk_state2str(disk->d_state)));
2571		} else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) {
2572			/* Previous state should be NEW. */
2573			KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
2574			    ("Wrong disk state (%s, %s).",
2575			    g_mirror_get_diskname(disk),
2576			    g_mirror_disk_state2str(disk->d_state)));
2577			/*
2578			 * Reset bumping syncid if disk disappeared in STARTING
2579			 * state.
2580			 */
2581			if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0)
2582				sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
2583#ifdef	INVARIANTS
2584		} else {
2585			KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
2586			    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#endif
2591		}
2592		DISK_STATE_CHANGED();
2593		G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.",
2594		    sc->sc_name, g_mirror_get_diskname(disk));
2595
2596		g_mirror_destroy_disk(disk);
2597		break;
2598	case G_MIRROR_DISK_STATE_DESTROY:
2599	    {
2600		int error;
2601
2602		error = g_mirror_clear_metadata(disk);
2603		if (error != 0)
2604			return (error);
2605		DISK_STATE_CHANGED();
2606		G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.",
2607		    sc->sc_name, g_mirror_get_diskname(disk));
2608
2609		g_mirror_destroy_disk(disk);
2610		sc->sc_ndisks--;
2611		LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2612			g_mirror_update_metadata(disk);
2613		}
2614		break;
2615	    }
2616	default:
2617		KASSERT(1 == 0, ("Unknown state (%u).", state));
2618		break;
2619	}
2620	return (0);
2621}
2622#undef	DISK_STATE_CHANGED
2623
2624int
2625g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md)
2626{
2627	struct g_provider *pp;
2628	u_char *buf;
2629	int error;
2630
2631	g_topology_assert();
2632
2633	error = g_access(cp, 1, 0, 0);
2634	if (error != 0)
2635		return (error);
2636	pp = cp->provider;
2637	g_topology_unlock();
2638	/* Metadata are stored on last sector. */
2639	buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
2640	    &error);
2641	g_topology_lock();
2642	g_access(cp, -1, 0, 0);
2643	if (buf == NULL) {
2644		G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).",
2645		    cp->provider->name, error);
2646		return (error);
2647	}
2648
2649	/* Decode metadata. */
2650	error = mirror_metadata_decode(buf, md);
2651	g_free(buf);
2652	if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0)
2653		return (EINVAL);
2654	if (md->md_version > G_MIRROR_VERSION) {
2655		G_MIRROR_DEBUG(0,
2656		    "Kernel module is too old to handle metadata from %s.",
2657		    cp->provider->name);
2658		return (EINVAL);
2659	}
2660	if (error != 0) {
2661		G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
2662		    cp->provider->name);
2663		return (error);
2664	}
2665
2666	return (0);
2667}
2668
2669static int
2670g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp,
2671    struct g_mirror_metadata *md)
2672{
2673
2674	if (g_mirror_id2disk(sc, md->md_did) != NULL) {
2675		G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.",
2676		    pp->name, md->md_did);
2677		return (EEXIST);
2678	}
2679	if (md->md_all != sc->sc_ndisks) {
2680		G_MIRROR_DEBUG(1,
2681		    "Invalid '%s' field on disk %s (device %s), skipping.",
2682		    "md_all", pp->name, sc->sc_name);
2683		return (EINVAL);
2684	}
2685	if (md->md_slice != sc->sc_slice) {
2686		G_MIRROR_DEBUG(1,
2687		    "Invalid '%s' field on disk %s (device %s), skipping.",
2688		    "md_slice", pp->name, sc->sc_name);
2689		return (EINVAL);
2690	}
2691	if (md->md_balance != sc->sc_balance) {
2692		G_MIRROR_DEBUG(1,
2693		    "Invalid '%s' field on disk %s (device %s), skipping.",
2694		    "md_balance", pp->name, sc->sc_name);
2695		return (EINVAL);
2696	}
2697	if (md->md_mediasize != sc->sc_mediasize) {
2698		G_MIRROR_DEBUG(1,
2699		    "Invalid '%s' field on disk %s (device %s), skipping.",
2700		    "md_mediasize", pp->name, sc->sc_name);
2701		return (EINVAL);
2702	}
2703	if (sc->sc_mediasize > pp->mediasize) {
2704		G_MIRROR_DEBUG(1,
2705		    "Invalid size of disk %s (device %s), skipping.", pp->name,
2706		    sc->sc_name);
2707		return (EINVAL);
2708	}
2709	if (md->md_sectorsize != sc->sc_sectorsize) {
2710		G_MIRROR_DEBUG(1,
2711		    "Invalid '%s' field on disk %s (device %s), skipping.",
2712		    "md_sectorsize", pp->name, sc->sc_name);
2713		return (EINVAL);
2714	}
2715	if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
2716		G_MIRROR_DEBUG(1,
2717		    "Invalid sector size of disk %s (device %s), skipping.",
2718		    pp->name, sc->sc_name);
2719		return (EINVAL);
2720	}
2721	if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) {
2722		G_MIRROR_DEBUG(1,
2723		    "Invalid device flags on disk %s (device %s), skipping.",
2724		    pp->name, sc->sc_name);
2725		return (EINVAL);
2726	}
2727	if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) {
2728		G_MIRROR_DEBUG(1,
2729		    "Invalid disk flags on disk %s (device %s), skipping.",
2730		    pp->name, sc->sc_name);
2731		return (EINVAL);
2732	}
2733	return (0);
2734}
2735
2736int
2737g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
2738    struct g_mirror_metadata *md)
2739{
2740	struct g_mirror_disk *disk;
2741	int error;
2742
2743	g_topology_assert_not();
2744	G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name);
2745
2746	error = g_mirror_check_metadata(sc, pp, md);
2747	if (error != 0)
2748		return (error);
2749	if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING &&
2750	    md->md_genid < sc->sc_genid) {
2751		G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.",
2752		    pp->name, sc->sc_name);
2753		return (EINVAL);
2754	}
2755	disk = g_mirror_init_disk(sc, pp, md, &error);
2756	if (disk == NULL)
2757		return (error);
2758	error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW,
2759	    G_MIRROR_EVENT_WAIT);
2760	if (error != 0)
2761		return (error);
2762	if (md->md_version < G_MIRROR_VERSION) {
2763		G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
2764		    pp->name, md->md_version, G_MIRROR_VERSION);
2765		g_mirror_update_metadata(disk);
2766	}
2767	return (0);
2768}
2769
2770static void
2771g_mirror_destroy_delayed(void *arg, int flag)
2772{
2773	struct g_mirror_softc *sc;
2774	int error;
2775
2776	if (flag == EV_CANCEL) {
2777		G_MIRROR_DEBUG(1, "Destroying canceled.");
2778		return;
2779	}
2780	sc = arg;
2781	g_topology_unlock();
2782	sx_xlock(&sc->sc_lock);
2783	KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0,
2784	    ("DESTROY flag set on %s.", sc->sc_name));
2785	KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0,
2786	    ("DESTROYING flag not set on %s.", sc->sc_name));
2787	G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name);
2788	error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT);
2789	if (error != 0) {
2790		G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name);
2791		sx_xunlock(&sc->sc_lock);
2792	}
2793	g_topology_lock();
2794}
2795
2796static int
2797g_mirror_access(struct g_provider *pp, int acr, int acw, int ace)
2798{
2799	struct g_mirror_softc *sc;
2800	int dcr, dcw, dce, error = 0;
2801
2802	g_topology_assert();
2803	G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
2804	    acw, ace);
2805
2806	sc = pp->geom->softc;
2807	if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0)
2808		return (0);
2809	KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name));
2810
2811	dcr = pp->acr + acr;
2812	dcw = pp->acw + acw;
2813	dce = pp->ace + ace;
2814
2815	g_topology_unlock();
2816	sx_xlock(&sc->sc_lock);
2817	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 ||
2818	    LIST_EMPTY(&sc->sc_disks)) {
2819		if (acr > 0 || acw > 0 || ace > 0)
2820			error = ENXIO;
2821		goto end;
2822	}
2823	if (dcw == 0 && !sc->sc_idle)
2824		g_mirror_idle(sc, dcw);
2825	if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) {
2826		if (acr > 0 || acw > 0 || ace > 0) {
2827			error = ENXIO;
2828			goto end;
2829		}
2830		if (dcr == 0 && dcw == 0 && dce == 0) {
2831			g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK,
2832			    sc, NULL);
2833		}
2834	}
2835end:
2836	sx_xunlock(&sc->sc_lock);
2837	g_topology_lock();
2838	return (error);
2839}
2840
2841static struct g_geom *
2842g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md)
2843{
2844	struct g_mirror_softc *sc;
2845	struct g_geom *gp;
2846	int error, timeout;
2847
2848	g_topology_assert();
2849	G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
2850	    md->md_mid);
2851
2852	/* One disk is minimum. */
2853	if (md->md_all < 1)
2854		return (NULL);
2855	/*
2856	 * Action geom.
2857	 */
2858	gp = g_new_geomf(mp, "%s", md->md_name);
2859	sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO);
2860	gp->start = g_mirror_start;
2861	gp->orphan = g_mirror_orphan;
2862	gp->access = g_mirror_access;
2863	gp->dumpconf = g_mirror_dumpconf;
2864
2865	sc->sc_id = md->md_mid;
2866	sc->sc_slice = md->md_slice;
2867	sc->sc_balance = md->md_balance;
2868	sc->sc_mediasize = md->md_mediasize;
2869	sc->sc_sectorsize = md->md_sectorsize;
2870	sc->sc_ndisks = md->md_all;
2871	sc->sc_flags = md->md_mflags;
2872	sc->sc_bump_id = 0;
2873	sc->sc_idle = 1;
2874	sc->sc_last_write = time_uptime;
2875	sc->sc_writes = 0;
2876	sx_init(&sc->sc_lock, "gmirror:lock");
2877	bioq_init(&sc->sc_queue);
2878	mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF);
2879	bioq_init(&sc->sc_regular_delayed);
2880	bioq_init(&sc->sc_inflight);
2881	bioq_init(&sc->sc_sync_delayed);
2882	LIST_INIT(&sc->sc_disks);
2883	TAILQ_INIT(&sc->sc_events);
2884	mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF);
2885	callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
2886	sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING;
2887	gp->softc = sc;
2888	sc->sc_geom = gp;
2889	sc->sc_provider = NULL;
2890	/*
2891	 * Synchronization geom.
2892	 */
2893	gp = g_new_geomf(mp, "%s.sync", md->md_name);
2894	gp->softc = sc;
2895	gp->orphan = g_mirror_orphan;
2896	sc->sc_sync.ds_geom = gp;
2897	sc->sc_sync.ds_ndisks = 0;
2898	error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0,
2899	    "g_mirror %s", md->md_name);
2900	if (error != 0) {
2901		G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.",
2902		    sc->sc_name);
2903		g_destroy_geom(sc->sc_sync.ds_geom);
2904		mtx_destroy(&sc->sc_events_mtx);
2905		mtx_destroy(&sc->sc_queue_mtx);
2906		sx_destroy(&sc->sc_lock);
2907		g_destroy_geom(sc->sc_geom);
2908		free(sc, M_MIRROR);
2909		return (NULL);
2910	}
2911
2912	G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).",
2913	    sc->sc_name, sc->sc_ndisks, sc->sc_id);
2914
2915	sc->sc_rootmount = root_mount_hold("GMIRROR");
2916	G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
2917	/*
2918	 * Run timeout.
2919	 */
2920	timeout = g_mirror_timeout * hz;
2921	callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc);
2922	return (sc->sc_geom);
2923}
2924
2925int
2926g_mirror_destroy(struct g_mirror_softc *sc, int how)
2927{
2928	struct g_mirror_disk *disk;
2929	struct g_provider *pp;
2930
2931	g_topology_assert_not();
2932	if (sc == NULL)
2933		return (ENXIO);
2934	sx_assert(&sc->sc_lock, SX_XLOCKED);
2935
2936	pp = sc->sc_provider;
2937	if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
2938		switch (how) {
2939		case G_MIRROR_DESTROY_SOFT:
2940			G_MIRROR_DEBUG(1,
2941			    "Device %s is still open (r%dw%de%d).", pp->name,
2942			    pp->acr, pp->acw, pp->ace);
2943			return (EBUSY);
2944		case G_MIRROR_DESTROY_DELAYED:
2945			G_MIRROR_DEBUG(1,
2946			    "Device %s will be destroyed on last close.",
2947			    pp->name);
2948			LIST_FOREACH(disk, &sc->sc_disks, d_next) {
2949				if (disk->d_state ==
2950				    G_MIRROR_DISK_STATE_SYNCHRONIZING) {
2951					g_mirror_sync_stop(disk, 1);
2952				}
2953			}
2954			sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING;
2955			return (EBUSY);
2956		case G_MIRROR_DESTROY_HARD:
2957			G_MIRROR_DEBUG(1, "Device %s is still open, so it "
2958			    "can't be definitely removed.", pp->name);
2959		}
2960	}
2961
2962	g_topology_lock();
2963	if (sc->sc_geom->softc == NULL) {
2964		g_topology_unlock();
2965		return (0);
2966	}
2967	sc->sc_geom->softc = NULL;
2968	sc->sc_sync.ds_geom->softc = NULL;
2969	g_topology_unlock();
2970
2971	sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
2972	sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT;
2973	G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
2974	sx_xunlock(&sc->sc_lock);
2975	mtx_lock(&sc->sc_queue_mtx);
2976	wakeup(sc);
2977	mtx_unlock(&sc->sc_queue_mtx);
2978	G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
2979	while (sc->sc_worker != NULL)
2980		tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5);
2981	G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
2982	sx_xlock(&sc->sc_lock);
2983	g_mirror_destroy_device(sc);
2984	free(sc, M_MIRROR);
2985	return (0);
2986}
2987
2988static void
2989g_mirror_taste_orphan(struct g_consumer *cp)
2990{
2991
2992	KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
2993	    cp->provider->name));
2994}
2995
2996static struct g_geom *
2997g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
2998{
2999	struct g_mirror_metadata md;
3000	struct g_mirror_softc *sc;
3001	struct g_consumer *cp;
3002	struct g_geom *gp;
3003	int error;
3004
3005	g_topology_assert();
3006	g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
3007	G_MIRROR_DEBUG(2, "Tasting %s.", pp->name);
3008
3009	gp = g_new_geomf(mp, "mirror:taste");
3010	/*
3011	 * This orphan function should be never called.
3012	 */
3013	gp->orphan = g_mirror_taste_orphan;
3014	cp = g_new_consumer(gp);
3015	g_attach(cp, pp);
3016	error = g_mirror_read_metadata(cp, &md);
3017	g_detach(cp);
3018	g_destroy_consumer(cp);
3019	g_destroy_geom(gp);
3020	if (error != 0)
3021		return (NULL);
3022	gp = NULL;
3023
3024	if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0)
3025		return (NULL);
3026	if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
3027		return (NULL);
3028	if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) {
3029		G_MIRROR_DEBUG(0,
3030		    "Device %s: provider %s marked as inactive, skipping.",
3031		    md.md_name, pp->name);
3032		return (NULL);
3033	}
3034	if (g_mirror_debug >= 2)
3035		mirror_metadata_dump(&md);
3036
3037	/*
3038	 * Let's check if device already exists.
3039	 */
3040	sc = NULL;
3041	LIST_FOREACH(gp, &mp->geom, geom) {
3042		sc = gp->softc;
3043		if (sc == NULL)
3044			continue;
3045		if (sc->sc_sync.ds_geom == gp)
3046			continue;
3047		if (strcmp(md.md_name, sc->sc_name) != 0)
3048			continue;
3049		if (md.md_mid != sc->sc_id) {
3050			G_MIRROR_DEBUG(0, "Device %s already configured.",
3051			    sc->sc_name);
3052			return (NULL);
3053		}
3054		break;
3055	}
3056	if (gp == NULL) {
3057		gp = g_mirror_create(mp, &md);
3058		if (gp == NULL) {
3059			G_MIRROR_DEBUG(0, "Cannot create device %s.",
3060			    md.md_name);
3061			return (NULL);
3062		}
3063		sc = gp->softc;
3064	}
3065	G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
3066	g_topology_unlock();
3067	sx_xlock(&sc->sc_lock);
3068	error = g_mirror_add_disk(sc, pp, &md);
3069	if (error != 0) {
3070		G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
3071		    pp->name, gp->name, error);
3072		if (LIST_EMPTY(&sc->sc_disks)) {
3073			g_cancel_event(sc);
3074			g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
3075			g_topology_lock();
3076			return (NULL);
3077		}
3078		gp = NULL;
3079	}
3080	sx_xunlock(&sc->sc_lock);
3081	g_topology_lock();
3082	return (gp);
3083}
3084
3085static int
3086g_mirror_destroy_geom(struct gctl_req *req __unused,
3087    struct g_class *mp __unused, struct g_geom *gp)
3088{
3089	struct g_mirror_softc *sc;
3090	int error;
3091
3092	g_topology_unlock();
3093	sc = gp->softc;
3094	sx_xlock(&sc->sc_lock);
3095	g_cancel_event(sc);
3096	error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT);
3097	if (error != 0)
3098		sx_xunlock(&sc->sc_lock);
3099	g_topology_lock();
3100	return (error);
3101}
3102
3103static void
3104g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
3105    struct g_consumer *cp, struct g_provider *pp)
3106{
3107	struct g_mirror_softc *sc;
3108
3109	g_topology_assert();
3110
3111	sc = gp->softc;
3112	if (sc == NULL)
3113		return;
3114	/* Skip synchronization geom. */
3115	if (gp == sc->sc_sync.ds_geom)
3116		return;
3117	if (pp != NULL) {
3118		/* Nothing here. */
3119	} else if (cp != NULL) {
3120		struct g_mirror_disk *disk;
3121
3122		disk = cp->private;
3123		if (disk == NULL)
3124			return;
3125		g_topology_unlock();
3126		sx_xlock(&sc->sc_lock);
3127		sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id);
3128		if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
3129			sbuf_printf(sb, "%s<Synchronized>", indent);
3130			if (disk->d_sync.ds_offset == 0)
3131				sbuf_printf(sb, "0%%");
3132			else {
3133				sbuf_printf(sb, "%u%%",
3134				    (u_int)((disk->d_sync.ds_offset * 100) /
3135				    sc->sc_provider->mediasize));
3136			}
3137			sbuf_printf(sb, "</Synchronized>\n");
3138		}
3139		sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
3140		    disk->d_sync.ds_syncid);
3141		sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent,
3142		    disk->d_genid);
3143		sbuf_printf(sb, "%s<Flags>", indent);
3144		if (disk->d_flags == 0)
3145			sbuf_printf(sb, "NONE");
3146		else {
3147			int first = 1;
3148
3149#define	ADD_FLAG(flag, name)	do {					\
3150	if ((disk->d_flags & (flag)) != 0) {				\
3151		if (!first)						\
3152			sbuf_printf(sb, ", ");				\
3153		else							\
3154			first = 0;					\
3155		sbuf_printf(sb, name);					\
3156	}								\
3157} while (0)
3158			ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY");
3159			ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED");
3160			ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE");
3161			ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING,
3162			    "SYNCHRONIZING");
3163			ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
3164			ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN");
3165#undef	ADD_FLAG
3166		}
3167		sbuf_printf(sb, "</Flags>\n");
3168		sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent,
3169		    disk->d_priority);
3170		sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3171		    g_mirror_disk_state2str(disk->d_state));
3172		sx_xunlock(&sc->sc_lock);
3173		g_topology_lock();
3174	} else {
3175		g_topology_unlock();
3176		sx_xlock(&sc->sc_lock);
3177		sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
3178		sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
3179		sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
3180		sbuf_printf(sb, "%s<Flags>", indent);
3181		if (sc->sc_flags == 0)
3182			sbuf_printf(sb, "NONE");
3183		else {
3184			int first = 1;
3185
3186#define	ADD_FLAG(flag, name)	do {					\
3187	if ((sc->sc_flags & (flag)) != 0) {				\
3188		if (!first)						\
3189			sbuf_printf(sb, ", ");				\
3190		else							\
3191			first = 0;					\
3192		sbuf_printf(sb, name);					\
3193	}								\
3194} while (0)
3195			ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC");
3196			ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
3197#undef	ADD_FLAG
3198		}
3199		sbuf_printf(sb, "</Flags>\n");
3200		sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent,
3201		    (u_int)sc->sc_slice);
3202		sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent,
3203		    balance_name(sc->sc_balance));
3204		sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
3205		    sc->sc_ndisks);
3206		sbuf_printf(sb, "%s<State>", indent);
3207		if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
3208			sbuf_printf(sb, "%s", "STARTING");
3209		else if (sc->sc_ndisks ==
3210		    g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE))
3211			sbuf_printf(sb, "%s", "COMPLETE");
3212		else
3213			sbuf_printf(sb, "%s", "DEGRADED");
3214		sbuf_printf(sb, "</State>\n");
3215		sx_xunlock(&sc->sc_lock);
3216		g_topology_lock();
3217	}
3218}
3219
3220static void
3221g_mirror_shutdown_pre_sync(void *arg, int howto)
3222{
3223	struct g_class *mp;
3224	struct g_geom *gp, *gp2;
3225	struct g_mirror_softc *sc;
3226	int error;
3227
3228	mp = arg;
3229	DROP_GIANT();
3230	g_topology_lock();
3231	LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
3232		if ((sc = gp->softc) == NULL)
3233			continue;
3234		/* Skip synchronization geom. */
3235		if (gp == sc->sc_sync.ds_geom)
3236			continue;
3237		g_topology_unlock();
3238		sx_xlock(&sc->sc_lock);
3239		g_cancel_event(sc);
3240		error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED);
3241		if (error != 0)
3242			sx_xunlock(&sc->sc_lock);
3243		g_topology_lock();
3244	}
3245	g_topology_unlock();
3246	PICKUP_GIANT();
3247}
3248
3249static void
3250g_mirror_init(struct g_class *mp)
3251{
3252
3253	g_mirror_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync,
3254	    g_mirror_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST);
3255	if (g_mirror_pre_sync == NULL)
3256		G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event.");
3257}
3258
3259static void
3260g_mirror_fini(struct g_class *mp)
3261{
3262
3263	if (g_mirror_pre_sync != NULL)
3264		EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mirror_pre_sync);
3265}
3266
3267DECLARE_GEOM_CLASS(g_mirror_class, g_mirror);
3268