g_concat.c revision 212754 
1/*-
2 * Copyright (c) 2004-2005 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/concat/g_concat.c 212754 2010-09-16 17:24:25Z 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/lock.h>
35#include <sys/mutex.h>
36#include <sys/bio.h>
37#include <sys/sysctl.h>
38#include <sys/malloc.h>
39#include <geom/geom.h>
40#include <geom/concat/g_concat.h>
41
42
43static MALLOC_DEFINE(M_CONCAT, "concat_data", "GEOM_CONCAT Data");
44
45SYSCTL_DECL(_kern_geom);
46SYSCTL_NODE(_kern_geom, OID_AUTO, concat, CTLFLAG_RW, 0, "GEOM_CONCAT stuff");
47static u_int g_concat_debug = 0;
48TUNABLE_INT("kern.geom.concat.debug", &g_concat_debug);
49SYSCTL_UINT(_kern_geom_concat, OID_AUTO, debug, CTLFLAG_RW, &g_concat_debug, 0,
50    "Debug level");
51
52static int g_concat_destroy(struct g_concat_softc *sc, boolean_t force);
53static int g_concat_destroy_geom(struct gctl_req *req, struct g_class *mp,
54    struct g_geom *gp);
55
56static g_taste_t g_concat_taste;
57static g_ctl_req_t g_concat_config;
58static g_dumpconf_t g_concat_dumpconf;
59
60struct g_class g_concat_class = {
61	.name = G_CONCAT_CLASS_NAME,
62	.version = G_VERSION,
63	.ctlreq = g_concat_config,
64	.taste = g_concat_taste,
65	.destroy_geom = g_concat_destroy_geom
66};
67
68
69/*
70 * Greatest Common Divisor.
71 */
72static u_int
73gcd(u_int a, u_int b)
74{
75	u_int c;
76
77	while (b != 0) {
78		c = a;
79		a = b;
80		b = (c % b);
81	}
82	return (a);
83}
84
85/*
86 * Least Common Multiple.
87 */
88static u_int
89lcm(u_int a, u_int b)
90{
91
92	return ((a * b) / gcd(a, b));
93}
94
95/*
96 * Return the number of valid disks.
97 */
98static u_int
99g_concat_nvalid(struct g_concat_softc *sc)
100{
101	u_int i, no;
102
103	no = 0;
104	for (i = 0; i < sc->sc_ndisks; i++) {
105		if (sc->sc_disks[i].d_consumer != NULL)
106			no++;
107	}
108
109	return (no);
110}
111
112static void
113g_concat_remove_disk(struct g_concat_disk *disk)
114{
115	struct g_consumer *cp;
116	struct g_concat_softc *sc;
117
118	KASSERT(disk->d_consumer != NULL, ("Non-valid disk in %s.", __func__));
119	sc = disk->d_softc;
120	cp = disk->d_consumer;
121
122	G_CONCAT_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
123	    sc->sc_name);
124
125	disk->d_consumer = NULL;
126	if (sc->sc_provider != NULL) {
127		sc->sc_provider->flags |= G_PF_WITHER;
128		g_orphan_provider(sc->sc_provider, ENXIO);
129		sc->sc_provider = NULL;
130		G_CONCAT_DEBUG(0, "Device %s removed.", sc->sc_name);
131	}
132
133	if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
134		g_access(cp, -cp->acr, -cp->acw, -cp->ace);
135	g_detach(cp);
136	g_destroy_consumer(cp);
137}
138
139static void
140g_concat_orphan(struct g_consumer *cp)
141{
142	struct g_concat_softc *sc;
143	struct g_concat_disk *disk;
144	struct g_geom *gp;
145
146	g_topology_assert();
147	gp = cp->geom;
148	sc = gp->softc;
149	if (sc == NULL)
150		return;
151
152	disk = cp->private;
153	if (disk == NULL)	/* Possible? */
154		return;
155	g_concat_remove_disk(disk);
156
157	/* If there are no valid disks anymore, remove device. */
158	if (g_concat_nvalid(sc) == 0)
159		g_concat_destroy(sc, 1);
160}
161
162static int
163g_concat_access(struct g_provider *pp, int dr, int dw, int de)
164{
165	struct g_consumer *cp1, *cp2;
166	struct g_concat_softc *sc;
167	struct g_geom *gp;
168	int error;
169
170	gp = pp->geom;
171	sc = gp->softc;
172
173	if (sc == NULL) {
174		/*
175		 * It looks like geom is being withered.
176		 * In that case we allow only negative requests.
177		 */
178		KASSERT(dr <= 0 && dw <= 0 && de <= 0,
179		    ("Positive access request (device=%s).", pp->name));
180		if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 &&
181		    (pp->ace + de) == 0) {
182			G_CONCAT_DEBUG(0, "Device %s definitely destroyed.",
183			    gp->name);
184		}
185		return (0);
186	}
187
188	/* On first open, grab an extra "exclusive" bit */
189	if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
190		de++;
191	/* ... and let go of it on last close */
192	if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
193		de--;
194
195	error = ENXIO;
196	LIST_FOREACH(cp1, &gp->consumer, consumer) {
197		error = g_access(cp1, dr, dw, de);
198		if (error == 0)
199			continue;
200		/*
201		 * If we fail here, backout all previous changes.
202		 */
203		LIST_FOREACH(cp2, &gp->consumer, consumer) {
204			if (cp1 == cp2)
205				return (error);
206			g_access(cp2, -dr, -dw, -de);
207		}
208		/* NOTREACHED */
209	}
210
211	return (error);
212}
213
214static void
215g_concat_kernel_dump(struct bio *bp)
216{
217	struct g_concat_softc *sc;
218	struct g_concat_disk *disk;
219	struct bio *cbp;
220	struct g_kerneldump *gkd;
221	u_int i;
222
223	sc = bp->bio_to->geom->softc;
224	gkd = (struct g_kerneldump *)bp->bio_data;
225	for (i = 0; i < sc->sc_ndisks; i++) {
226		if (sc->sc_disks[i].d_start <= gkd->offset &&
227		    sc->sc_disks[i].d_end > gkd->offset)
228			break;
229	}
230	if (i == sc->sc_ndisks)
231		g_io_deliver(bp, EOPNOTSUPP);
232	disk = &sc->sc_disks[i];
233	gkd->offset -= disk->d_start;
234	if (gkd->length > disk->d_end - disk->d_start - gkd->offset)
235		gkd->length = disk->d_end - disk->d_start - gkd->offset;
236	cbp = g_clone_bio(bp);
237	if (cbp == NULL) {
238		g_io_deliver(bp, ENOMEM);
239		return;
240	}
241	cbp->bio_done = g_std_done;
242	g_io_request(cbp, disk->d_consumer);
243	G_CONCAT_DEBUG(1, "Kernel dump will go to %s.",
244	    disk->d_consumer->provider->name);
245}
246
247static void
248g_concat_flush(struct g_concat_softc *sc, struct bio *bp)
249{
250	struct bio_queue_head queue;
251	struct g_consumer *cp;
252	struct bio *cbp;
253	u_int no;
254
255	bioq_init(&queue);
256	for (no = 0; no < sc->sc_ndisks; no++) {
257		cbp = g_clone_bio(bp);
258		if (cbp == NULL) {
259			for (cbp = bioq_first(&queue); cbp != NULL;
260			    cbp = bioq_first(&queue)) {
261				bioq_remove(&queue, cbp);
262				g_destroy_bio(cbp);
263			}
264			if (bp->bio_error == 0)
265				bp->bio_error = ENOMEM;
266			g_io_deliver(bp, bp->bio_error);
267			return;
268		}
269		bioq_insert_tail(&queue, cbp);
270		cbp->bio_done = g_std_done;
271		cbp->bio_caller1 = sc->sc_disks[no].d_consumer;
272		cbp->bio_to = sc->sc_disks[no].d_consumer->provider;
273	}
274	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
275		bioq_remove(&queue, cbp);
276		G_CONCAT_LOGREQ(cbp, "Sending request.");
277		cp = cbp->bio_caller1;
278		cbp->bio_caller1 = NULL;
279		g_io_request(cbp, cp);
280	}
281}
282
283static void
284g_concat_start(struct bio *bp)
285{
286	struct bio_queue_head queue;
287	struct g_concat_softc *sc;
288	struct g_concat_disk *disk;
289	struct g_provider *pp;
290	off_t offset, end, length, off, len;
291	struct bio *cbp;
292	char *addr;
293	u_int no;
294
295	pp = bp->bio_to;
296	sc = pp->geom->softc;
297	/*
298	 * If sc == NULL, provider's error should be set and g_concat_start()
299	 * should not be called at all.
300	 */
301	KASSERT(sc != NULL,
302	    ("Provider's error should be set (error=%d)(device=%s).",
303	    bp->bio_to->error, bp->bio_to->name));
304
305	G_CONCAT_LOGREQ(bp, "Request received.");
306
307	switch (bp->bio_cmd) {
308	case BIO_READ:
309	case BIO_WRITE:
310	case BIO_DELETE:
311		break;
312	case BIO_FLUSH:
313		g_concat_flush(sc, bp);
314		return;
315	case BIO_GETATTR:
316		if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
317			g_concat_kernel_dump(bp);
318			return;
319		}
320		/* To which provider it should be delivered? */
321		/* FALLTHROUGH */
322	default:
323		g_io_deliver(bp, EOPNOTSUPP);
324		return;
325	}
326
327	offset = bp->bio_offset;
328	length = bp->bio_length;
329	addr = bp->bio_data;
330	end = offset + length;
331
332	bioq_init(&queue);
333	for (no = 0; no < sc->sc_ndisks; no++) {
334		disk = &sc->sc_disks[no];
335		if (disk->d_end <= offset)
336			continue;
337		if (disk->d_start >= end)
338			break;
339
340		off = offset - disk->d_start;
341		len = MIN(length, disk->d_end - offset);
342		length -= len;
343		offset += len;
344
345		cbp = g_clone_bio(bp);
346		if (cbp == NULL) {
347			for (cbp = bioq_first(&queue); cbp != NULL;
348			    cbp = bioq_first(&queue)) {
349				bioq_remove(&queue, cbp);
350				g_destroy_bio(cbp);
351			}
352			if (bp->bio_error == 0)
353				bp->bio_error = ENOMEM;
354			g_io_deliver(bp, bp->bio_error);
355			return;
356		}
357		bioq_insert_tail(&queue, cbp);
358		/*
359		 * Fill in the component buf structure.
360		 */
361		cbp->bio_done = g_std_done;
362		cbp->bio_offset = off;
363		cbp->bio_data = addr;
364		addr += len;
365		cbp->bio_length = len;
366		cbp->bio_to = disk->d_consumer->provider;
367		cbp->bio_caller1 = disk;
368
369		if (length == 0)
370			break;
371	}
372	KASSERT(length == 0,
373	    ("Length is still greater than 0 (class=%s, name=%s).",
374	    bp->bio_to->geom->class->name, bp->bio_to->geom->name));
375	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
376		bioq_remove(&queue, cbp);
377		G_CONCAT_LOGREQ(cbp, "Sending request.");
378		disk = cbp->bio_caller1;
379		cbp->bio_caller1 = NULL;
380		g_io_request(cbp, disk->d_consumer);
381	}
382}
383
384static void
385g_concat_check_and_run(struct g_concat_softc *sc)
386{
387	struct g_concat_disk *disk;
388	struct g_provider *pp;
389	u_int no, sectorsize = 0;
390	off_t start;
391
392	if (g_concat_nvalid(sc) != sc->sc_ndisks)
393		return;
394
395	pp = g_new_providerf(sc->sc_geom, "concat/%s", sc->sc_name);
396	start = 0;
397	for (no = 0; no < sc->sc_ndisks; no++) {
398		disk = &sc->sc_disks[no];
399		disk->d_start = start;
400		disk->d_end = disk->d_start +
401		    disk->d_consumer->provider->mediasize;
402		if (sc->sc_type == G_CONCAT_TYPE_AUTOMATIC)
403			disk->d_end -= disk->d_consumer->provider->sectorsize;
404		start = disk->d_end;
405		if (no == 0)
406			sectorsize = disk->d_consumer->provider->sectorsize;
407		else {
408			sectorsize = lcm(sectorsize,
409			    disk->d_consumer->provider->sectorsize);
410		}
411	}
412	pp->sectorsize = sectorsize;
413	/* We have sc->sc_disks[sc->sc_ndisks - 1].d_end in 'start'. */
414	pp->mediasize = start;
415	pp->stripesize = sc->sc_disks[0].d_consumer->provider->stripesize;
416	pp->stripeoffset = sc->sc_disks[0].d_consumer->provider->stripeoffset;
417	sc->sc_provider = pp;
418	g_error_provider(pp, 0);
419
420	G_CONCAT_DEBUG(0, "Device %s activated.", sc->sc_name);
421}
422
423static int
424g_concat_read_metadata(struct g_consumer *cp, struct g_concat_metadata *md)
425{
426	struct g_provider *pp;
427	u_char *buf;
428	int error;
429
430	g_topology_assert();
431
432	error = g_access(cp, 1, 0, 0);
433	if (error != 0)
434		return (error);
435	pp = cp->provider;
436	g_topology_unlock();
437	buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
438	    &error);
439	g_topology_lock();
440	g_access(cp, -1, 0, 0);
441	if (buf == NULL)
442		return (error);
443
444	/* Decode metadata. */
445	concat_metadata_decode(buf, md);
446	g_free(buf);
447
448	return (0);
449}
450
451/*
452 * Add disk to given device.
453 */
454static int
455g_concat_add_disk(struct g_concat_softc *sc, struct g_provider *pp, u_int no)
456{
457	struct g_concat_disk *disk;
458	struct g_consumer *cp, *fcp;
459	struct g_geom *gp;
460	int error;
461
462	/* Metadata corrupted? */
463	if (no >= sc->sc_ndisks)
464		return (EINVAL);
465
466	disk = &sc->sc_disks[no];
467	/* Check if disk is not already attached. */
468	if (disk->d_consumer != NULL)
469		return (EEXIST);
470
471	gp = sc->sc_geom;
472	fcp = LIST_FIRST(&gp->consumer);
473
474	cp = g_new_consumer(gp);
475	error = g_attach(cp, pp);
476	if (error != 0) {
477		g_destroy_consumer(cp);
478		return (error);
479	}
480
481	if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
482		error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
483		if (error != 0) {
484			g_detach(cp);
485			g_destroy_consumer(cp);
486			return (error);
487		}
488	}
489	if (sc->sc_type == G_CONCAT_TYPE_AUTOMATIC) {
490		struct g_concat_metadata md;
491
492		/* Re-read metadata. */
493		error = g_concat_read_metadata(cp, &md);
494		if (error != 0)
495			goto fail;
496
497		if (strcmp(md.md_magic, G_CONCAT_MAGIC) != 0 ||
498		    strcmp(md.md_name, sc->sc_name) != 0 ||
499		    md.md_id != sc->sc_id) {
500			G_CONCAT_DEBUG(0, "Metadata on %s changed.", pp->name);
501			goto fail;
502		}
503	}
504
505	cp->private = disk;
506	disk->d_consumer = cp;
507	disk->d_softc = sc;
508	disk->d_start = 0;	/* not yet */
509	disk->d_end = 0;	/* not yet */
510
511	G_CONCAT_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
512
513	g_concat_check_and_run(sc);
514
515	return (0);
516fail:
517	if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
518		g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
519	g_detach(cp);
520	g_destroy_consumer(cp);
521	return (error);
522}
523
524static struct g_geom *
525g_concat_create(struct g_class *mp, const struct g_concat_metadata *md,
526    u_int type)
527{
528	struct g_concat_softc *sc;
529	struct g_geom *gp;
530	u_int no;
531
532	G_CONCAT_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
533	    md->md_id);
534
535	/* One disks is minimum. */
536	if (md->md_all < 1)
537		return (NULL);
538
539	/* Check for duplicate unit */
540	LIST_FOREACH(gp, &mp->geom, geom) {
541		sc = gp->softc;
542		if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
543			G_CONCAT_DEBUG(0, "Device %s already configured.",
544			    gp->name);
545			return (NULL);
546		}
547	}
548	gp = g_new_geomf(mp, "%s", md->md_name);
549	gp->softc = NULL;	/* for a moment */
550
551	sc = malloc(sizeof(*sc), M_CONCAT, M_WAITOK | M_ZERO);
552	gp->start = g_concat_start;
553	gp->spoiled = g_concat_orphan;
554	gp->orphan = g_concat_orphan;
555	gp->access = g_concat_access;
556	gp->dumpconf = g_concat_dumpconf;
557
558	sc->sc_id = md->md_id;
559	sc->sc_ndisks = md->md_all;
560	sc->sc_disks = malloc(sizeof(struct g_concat_disk) * sc->sc_ndisks,
561	    M_CONCAT, M_WAITOK | M_ZERO);
562	for (no = 0; no < sc->sc_ndisks; no++)
563		sc->sc_disks[no].d_consumer = NULL;
564	sc->sc_type = type;
565
566	gp->softc = sc;
567	sc->sc_geom = gp;
568	sc->sc_provider = NULL;
569
570	G_CONCAT_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
571
572	return (gp);
573}
574
575static int
576g_concat_destroy(struct g_concat_softc *sc, boolean_t force)
577{
578	struct g_provider *pp;
579	struct g_geom *gp;
580	u_int no;
581
582	g_topology_assert();
583
584	if (sc == NULL)
585		return (ENXIO);
586
587	pp = sc->sc_provider;
588	if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
589		if (force) {
590			G_CONCAT_DEBUG(0, "Device %s is still open, so it "
591			    "can't be definitely removed.", pp->name);
592		} else {
593			G_CONCAT_DEBUG(1,
594			    "Device %s is still open (r%dw%de%d).", pp->name,
595			    pp->acr, pp->acw, pp->ace);
596			return (EBUSY);
597		}
598	}
599
600	for (no = 0; no < sc->sc_ndisks; no++) {
601		if (sc->sc_disks[no].d_consumer != NULL)
602			g_concat_remove_disk(&sc->sc_disks[no]);
603	}
604
605	gp = sc->sc_geom;
606	gp->softc = NULL;
607	KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
608	    gp->name));
609	free(sc->sc_disks, M_CONCAT);
610	free(sc, M_CONCAT);
611
612	pp = LIST_FIRST(&gp->provider);
613	if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
614		G_CONCAT_DEBUG(0, "Device %s destroyed.", gp->name);
615
616	g_wither_geom(gp, ENXIO);
617
618	return (0);
619}
620
621static int
622g_concat_destroy_geom(struct gctl_req *req __unused,
623    struct g_class *mp __unused, struct g_geom *gp)
624{
625	struct g_concat_softc *sc;
626
627	sc = gp->softc;
628	return (g_concat_destroy(sc, 0));
629}
630
631static struct g_geom *
632g_concat_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
633{
634	struct g_concat_metadata md;
635	struct g_concat_softc *sc;
636	struct g_consumer *cp;
637	struct g_geom *gp;
638	int error;
639
640	g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
641	g_topology_assert();
642
643	/* Skip providers that are already open for writing. */
644	if (pp->acw > 0)
645		return (NULL);
646
647	G_CONCAT_DEBUG(3, "Tasting %s.", pp->name);
648
649	gp = g_new_geomf(mp, "concat:taste");
650	gp->start = g_concat_start;
651	gp->access = g_concat_access;
652	gp->orphan = g_concat_orphan;
653	cp = g_new_consumer(gp);
654	g_attach(cp, pp);
655	error = g_concat_read_metadata(cp, &md);
656	g_detach(cp);
657	g_destroy_consumer(cp);
658	g_destroy_geom(gp);
659	if (error != 0)
660		return (NULL);
661	gp = NULL;
662
663	if (strcmp(md.md_magic, G_CONCAT_MAGIC) != 0)
664		return (NULL);
665	if (md.md_version > G_CONCAT_VERSION) {
666		printf("geom_concat.ko module is too old to handle %s.\n",
667		    pp->name);
668		return (NULL);
669	}
670	/*
671	 * Backward compatibility:
672	 */
673	/* There was no md_provider field in earlier versions of metadata. */
674	if (md.md_version < 3)
675		bzero(md.md_provider, sizeof(md.md_provider));
676	/* There was no md_provsize field in earlier versions of metadata. */
677	if (md.md_version < 4)
678		md.md_provsize = pp->mediasize;
679
680	if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0)
681		return (NULL);
682	if (md.md_provsize != pp->mediasize)
683		return (NULL);
684
685	/*
686	 * Let's check if device already exists.
687	 */
688	sc = NULL;
689	LIST_FOREACH(gp, &mp->geom, geom) {
690		sc = gp->softc;
691		if (sc == NULL)
692			continue;
693		if (sc->sc_type != G_CONCAT_TYPE_AUTOMATIC)
694			continue;
695		if (strcmp(md.md_name, sc->sc_name) != 0)
696			continue;
697		if (md.md_id != sc->sc_id)
698			continue;
699		break;
700	}
701	if (gp != NULL) {
702		G_CONCAT_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
703		error = g_concat_add_disk(sc, pp, md.md_no);
704		if (error != 0) {
705			G_CONCAT_DEBUG(0,
706			    "Cannot add disk %s to %s (error=%d).", pp->name,
707			    gp->name, error);
708			return (NULL);
709		}
710	} else {
711		gp = g_concat_create(mp, &md, G_CONCAT_TYPE_AUTOMATIC);
712		if (gp == NULL) {
713			G_CONCAT_DEBUG(0, "Cannot create device %s.",
714			    md.md_name);
715			return (NULL);
716		}
717		sc = gp->softc;
718		G_CONCAT_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
719		error = g_concat_add_disk(sc, pp, md.md_no);
720		if (error != 0) {
721			G_CONCAT_DEBUG(0,
722			    "Cannot add disk %s to %s (error=%d).", pp->name,
723			    gp->name, error);
724			g_concat_destroy(sc, 1);
725			return (NULL);
726		}
727	}
728
729	return (gp);
730}
731
732static void
733g_concat_ctl_create(struct gctl_req *req, struct g_class *mp)
734{
735	u_int attached, no;
736	struct g_concat_metadata md;
737	struct g_provider *pp;
738	struct g_concat_softc *sc;
739	struct g_geom *gp;
740	struct sbuf *sb;
741	const char *name;
742	char param[16];
743	int *nargs;
744
745	g_topology_assert();
746	nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
747	if (nargs == NULL) {
748		gctl_error(req, "No '%s' argument.", "nargs");
749		return;
750	}
751	if (*nargs < 2) {
752		gctl_error(req, "Too few arguments.");
753		return;
754	}
755
756	strlcpy(md.md_magic, G_CONCAT_MAGIC, sizeof(md.md_magic));
757	md.md_version = G_CONCAT_VERSION;
758	name = gctl_get_asciiparam(req, "arg0");
759	if (name == NULL) {
760		gctl_error(req, "No 'arg%u' argument.", 0);
761		return;
762	}
763	strlcpy(md.md_name, name, sizeof(md.md_name));
764	md.md_id = arc4random();
765	md.md_no = 0;
766	md.md_all = *nargs - 1;
767	bzero(md.md_provider, sizeof(md.md_provider));
768	/* This field is not important here. */
769	md.md_provsize = 0;
770
771	/* Check all providers are valid */
772	for (no = 1; no < *nargs; no++) {
773		snprintf(param, sizeof(param), "arg%u", no);
774		name = gctl_get_asciiparam(req, param);
775		if (name == NULL) {
776			gctl_error(req, "No 'arg%u' argument.", no);
777			return;
778		}
779		if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
780			name += strlen("/dev/");
781		pp = g_provider_by_name(name);
782		if (pp == NULL) {
783			G_CONCAT_DEBUG(1, "Disk %s is invalid.", name);
784			gctl_error(req, "Disk %s is invalid.", name);
785			return;
786		}
787	}
788
789	gp = g_concat_create(mp, &md, G_CONCAT_TYPE_MANUAL);
790	if (gp == NULL) {
791		gctl_error(req, "Can't configure %s.", md.md_name);
792		return;
793	}
794
795	sc = gp->softc;
796	sb = sbuf_new_auto();
797	sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
798	for (attached = 0, no = 1; no < *nargs; no++) {
799		snprintf(param, sizeof(param), "arg%u", no);
800		name = gctl_get_asciiparam(req, param);
801		if (name == NULL) {
802			gctl_error(req, "No 'arg%d' argument.", no);
803			return;
804		}
805		if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
806			name += strlen("/dev/");
807		pp = g_provider_by_name(name);
808		KASSERT(pp != NULL, ("Provider %s disappear?!", name));
809		if (g_concat_add_disk(sc, pp, no - 1) != 0) {
810			G_CONCAT_DEBUG(1, "Disk %u (%s) not attached to %s.",
811			    no, pp->name, gp->name);
812			sbuf_printf(sb, " %s", pp->name);
813			continue;
814		}
815		attached++;
816	}
817	sbuf_finish(sb);
818	if (md.md_all != attached) {
819		g_concat_destroy(gp->softc, 1);
820		gctl_error(req, "%s", sbuf_data(sb));
821	}
822	sbuf_delete(sb);
823}
824
825static struct g_concat_softc *
826g_concat_find_device(struct g_class *mp, const char *name)
827{
828	struct g_concat_softc *sc;
829	struct g_geom *gp;
830
831	LIST_FOREACH(gp, &mp->geom, geom) {
832		sc = gp->softc;
833		if (sc == NULL)
834			continue;
835		if (strcmp(sc->sc_name, name) == 0)
836			return (sc);
837	}
838	return (NULL);
839}
840
841static void
842g_concat_ctl_destroy(struct gctl_req *req, struct g_class *mp)
843{
844	struct g_concat_softc *sc;
845	int *force, *nargs, error;
846	const char *name;
847	char param[16];
848	u_int i;
849
850	g_topology_assert();
851
852	nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
853	if (nargs == NULL) {
854		gctl_error(req, "No '%s' argument.", "nargs");
855		return;
856	}
857	if (*nargs <= 0) {
858		gctl_error(req, "Missing device(s).");
859		return;
860	}
861	force = gctl_get_paraml(req, "force", sizeof(*force));
862	if (force == NULL) {
863		gctl_error(req, "No '%s' argument.", "force");
864		return;
865	}
866
867	for (i = 0; i < (u_int)*nargs; i++) {
868		snprintf(param, sizeof(param), "arg%u", i);
869		name = gctl_get_asciiparam(req, param);
870		if (name == NULL) {
871			gctl_error(req, "No 'arg%u' argument.", i);
872			return;
873		}
874		sc = g_concat_find_device(mp, name);
875		if (sc == NULL) {
876			gctl_error(req, "No such device: %s.", name);
877			return;
878		}
879		error = g_concat_destroy(sc, *force);
880		if (error != 0) {
881			gctl_error(req, "Cannot destroy device %s (error=%d).",
882			    sc->sc_name, error);
883			return;
884		}
885	}
886}
887
888static void
889g_concat_config(struct gctl_req *req, struct g_class *mp, const char *verb)
890{
891	uint32_t *version;
892
893	g_topology_assert();
894
895	version = gctl_get_paraml(req, "version", sizeof(*version));
896	if (version == NULL) {
897		gctl_error(req, "No '%s' argument.", "version");
898		return;
899	}
900	if (*version != G_CONCAT_VERSION) {
901		gctl_error(req, "Userland and kernel parts are out of sync.");
902		return;
903	}
904
905	if (strcmp(verb, "create") == 0) {
906		g_concat_ctl_create(req, mp);
907		return;
908	} else if (strcmp(verb, "destroy") == 0 ||
909	    strcmp(verb, "stop") == 0) {
910		g_concat_ctl_destroy(req, mp);
911		return;
912	}
913	gctl_error(req, "Unknown verb.");
914}
915
916static void
917g_concat_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
918    struct g_consumer *cp, struct g_provider *pp)
919{
920	struct g_concat_softc *sc;
921
922	g_topology_assert();
923	sc = gp->softc;
924	if (sc == NULL)
925		return;
926	if (pp != NULL) {
927		/* Nothing here. */
928	} else if (cp != NULL) {
929		struct g_concat_disk *disk;
930
931		disk = cp->private;
932		if (disk == NULL)
933			return;
934		sbuf_printf(sb, "%s<End>%jd</End>\n", indent,
935		    (intmax_t)disk->d_end);
936		sbuf_printf(sb, "%s<Start>%jd</Start>\n", indent,
937		    (intmax_t)disk->d_start);
938	} else {
939		sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
940		sbuf_printf(sb, "%s<Type>", indent);
941		switch (sc->sc_type) {
942		case G_CONCAT_TYPE_AUTOMATIC:
943			sbuf_printf(sb, "AUTOMATIC");
944			break;
945		case G_CONCAT_TYPE_MANUAL:
946			sbuf_printf(sb, "MANUAL");
947			break;
948		default:
949			sbuf_printf(sb, "UNKNOWN");
950			break;
951		}
952		sbuf_printf(sb, "</Type>\n");
953		sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
954		    indent, sc->sc_ndisks, g_concat_nvalid(sc));
955		sbuf_printf(sb, "%s<State>", indent);
956		if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
957			sbuf_printf(sb, "UP");
958		else
959			sbuf_printf(sb, "DOWN");
960		sbuf_printf(sb, "</State>\n");
961	}
962}
963
964DECLARE_GEOM_CLASS(g_concat_class, g_concat);
965