1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/12/sys/geom/concat/g_concat.c 349825 2019-07-07 18:47:01Z mav $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/lock.h>
37 #include <sys/mutex.h>
38 #include <sys/bio.h>
39 #include <sys/sbuf.h>
40 #include <sys/sysctl.h>
41 #include <sys/malloc.h>
42 #include <geom/geom.h>
43 #include <geom/concat/g_concat.h>
44
45 FEATURE(geom_concat, "GEOM concatenation support");
46
47 static MALLOC_DEFINE(M_CONCAT, "concat_data", "GEOM_CONCAT Data");
48
49 SYSCTL_DECL(_kern_geom);
50 static SYSCTL_NODE(_kern_geom, OID_AUTO, concat, CTLFLAG_RW, 0,
51 "GEOM_CONCAT stuff");
52 static u_int g_concat_debug = 0;
53 SYSCTL_UINT(_kern_geom_concat, OID_AUTO, debug, CTLFLAG_RWTUN, &g_concat_debug, 0,
54 "Debug level");
55
56 static int g_concat_destroy(struct g_concat_softc *sc, boolean_t force);
57 static int g_concat_destroy_geom(struct gctl_req *req, struct g_class *mp,
58 struct g_geom *gp);
59
60 static g_taste_t g_concat_taste;
61 static g_ctl_req_t g_concat_config;
62 static g_dumpconf_t g_concat_dumpconf;
63
64 struct g_class g_concat_class = {
65 .name = G_CONCAT_CLASS_NAME,
66 .version = G_VERSION,
67 .ctlreq = g_concat_config,
68 .taste = g_concat_taste,
69 .destroy_geom = g_concat_destroy_geom
70 };
71
72
73 /*
74 * Greatest Common Divisor.
75 */
76 static u_int
gcd(u_int a,u_int b)77 gcd(u_int a, u_int b)
78 {
79 u_int c;
80
81 while (b != 0) {
82 c = a;
83 a = b;
84 b = (c % b);
85 }
86 return (a);
87 }
88
89 /*
90 * Least Common Multiple.
91 */
92 static u_int
lcm(u_int a,u_int b)93 lcm(u_int a, u_int b)
94 {
95
96 return ((a * b) / gcd(a, b));
97 }
98
99 /*
100 * Return the number of valid disks.
101 */
102 static u_int
g_concat_nvalid(struct g_concat_softc * sc)103 g_concat_nvalid(struct g_concat_softc *sc)
104 {
105 u_int i, no;
106
107 no = 0;
108 for (i = 0; i < sc->sc_ndisks; i++) {
109 if (sc->sc_disks[i].d_consumer != NULL)
110 no++;
111 }
112
113 return (no);
114 }
115
116 static void
g_concat_remove_disk(struct g_concat_disk * disk)117 g_concat_remove_disk(struct g_concat_disk *disk)
118 {
119 struct g_consumer *cp;
120 struct g_concat_softc *sc;
121
122 g_topology_assert();
123 KASSERT(disk->d_consumer != NULL, ("Non-valid disk in %s.", __func__));
124 sc = disk->d_softc;
125 cp = disk->d_consumer;
126
127 if (!disk->d_removed) {
128 G_CONCAT_DEBUG(0, "Disk %s removed from %s.",
129 cp->provider->name, sc->sc_name);
130 disk->d_removed = 1;
131 }
132
133 if (sc->sc_provider != NULL) {
134 G_CONCAT_DEBUG(0, "Device %s deactivated.",
135 sc->sc_provider->name);
136 g_wither_provider(sc->sc_provider, ENXIO);
137 sc->sc_provider = NULL;
138 }
139
140 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
141 return;
142 disk->d_consumer = NULL;
143 g_detach(cp);
144 g_destroy_consumer(cp);
145 /* If there are no valid disks anymore, remove device. */
146 if (LIST_EMPTY(&sc->sc_geom->consumer))
147 g_concat_destroy(sc, 1);
148 }
149
150 static void
g_concat_orphan(struct g_consumer * cp)151 g_concat_orphan(struct g_consumer *cp)
152 {
153 struct g_concat_softc *sc;
154 struct g_concat_disk *disk;
155 struct g_geom *gp;
156
157 g_topology_assert();
158 gp = cp->geom;
159 sc = gp->softc;
160 if (sc == NULL)
161 return;
162
163 disk = cp->private;
164 if (disk == NULL) /* Possible? */
165 return;
166 g_concat_remove_disk(disk);
167 }
168
169 static int
g_concat_access(struct g_provider * pp,int dr,int dw,int de)170 g_concat_access(struct g_provider *pp, int dr, int dw, int de)
171 {
172 struct g_consumer *cp1, *cp2, *tmp;
173 struct g_concat_disk *disk;
174 struct g_geom *gp;
175 int error;
176
177 g_topology_assert();
178 gp = pp->geom;
179
180 /* On first open, grab an extra "exclusive" bit */
181 if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
182 de++;
183 /* ... and let go of it on last close */
184 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
185 de--;
186
187 LIST_FOREACH_SAFE(cp1, &gp->consumer, consumer, tmp) {
188 error = g_access(cp1, dr, dw, de);
189 if (error != 0)
190 goto fail;
191 disk = cp1->private;
192 if (cp1->acr == 0 && cp1->acw == 0 && cp1->ace == 0 &&
193 disk->d_removed) {
194 g_concat_remove_disk(disk); /* May destroy geom. */
195 }
196 }
197 return (0);
198
199 fail:
200 LIST_FOREACH(cp2, &gp->consumer, consumer) {
201 if (cp1 == cp2)
202 break;
203 g_access(cp2, -dr, -dw, -de);
204 }
205 return (error);
206 }
207
208 static void
g_concat_candelete(struct bio * bp)209 g_concat_candelete(struct bio *bp)
210 {
211 struct g_concat_softc *sc;
212 struct g_concat_disk *disk;
213 int i, val;
214
215 sc = bp->bio_to->geom->softc;
216 for (i = 0; i < sc->sc_ndisks; i++) {
217 disk = &sc->sc_disks[i];
218 if (!disk->d_removed && disk->d_candelete)
219 break;
220 }
221 val = i < sc->sc_ndisks;
222 g_handleattr(bp, "GEOM::candelete", &val, sizeof(val));
223 }
224
225 static void
g_concat_kernel_dump(struct bio * bp)226 g_concat_kernel_dump(struct bio *bp)
227 {
228 struct g_concat_softc *sc;
229 struct g_concat_disk *disk;
230 struct bio *cbp;
231 struct g_kerneldump *gkd;
232 u_int i;
233
234 sc = bp->bio_to->geom->softc;
235 gkd = (struct g_kerneldump *)bp->bio_data;
236 for (i = 0; i < sc->sc_ndisks; i++) {
237 if (sc->sc_disks[i].d_start <= gkd->offset &&
238 sc->sc_disks[i].d_end > gkd->offset)
239 break;
240 }
241 if (i == sc->sc_ndisks) {
242 g_io_deliver(bp, EOPNOTSUPP);
243 return;
244 }
245 disk = &sc->sc_disks[i];
246 gkd->offset -= disk->d_start;
247 if (gkd->length > disk->d_end - disk->d_start - gkd->offset)
248 gkd->length = disk->d_end - disk->d_start - gkd->offset;
249 cbp = g_clone_bio(bp);
250 if (cbp == NULL) {
251 g_io_deliver(bp, ENOMEM);
252 return;
253 }
254 cbp->bio_done = g_std_done;
255 g_io_request(cbp, disk->d_consumer);
256 G_CONCAT_DEBUG(1, "Kernel dump will go to %s.",
257 disk->d_consumer->provider->name);
258 }
259
260 static void
g_concat_done(struct bio * bp)261 g_concat_done(struct bio *bp)
262 {
263 struct g_concat_softc *sc;
264 struct bio *pbp;
265
266 pbp = bp->bio_parent;
267 sc = pbp->bio_to->geom->softc;
268 mtx_lock(&sc->sc_lock);
269 if (pbp->bio_error == 0)
270 pbp->bio_error = bp->bio_error;
271 pbp->bio_completed += bp->bio_completed;
272 pbp->bio_inbed++;
273 if (pbp->bio_children == pbp->bio_inbed) {
274 mtx_unlock(&sc->sc_lock);
275 g_io_deliver(pbp, pbp->bio_error);
276 } else
277 mtx_unlock(&sc->sc_lock);
278 g_destroy_bio(bp);
279 }
280
281 static void
g_concat_flush(struct g_concat_softc * sc,struct bio * bp)282 g_concat_flush(struct g_concat_softc *sc, struct bio *bp)
283 {
284 struct bio_queue_head queue;
285 struct g_consumer *cp;
286 struct bio *cbp;
287 u_int no;
288
289 bioq_init(&queue);
290 for (no = 0; no < sc->sc_ndisks; no++) {
291 cbp = g_clone_bio(bp);
292 if (cbp == NULL) {
293 while ((cbp = bioq_takefirst(&queue)) != NULL)
294 g_destroy_bio(cbp);
295 if (bp->bio_error == 0)
296 bp->bio_error = ENOMEM;
297 g_io_deliver(bp, bp->bio_error);
298 return;
299 }
300 bioq_insert_tail(&queue, cbp);
301 cbp->bio_done = g_concat_done;
302 cbp->bio_caller1 = sc->sc_disks[no].d_consumer;
303 cbp->bio_to = sc->sc_disks[no].d_consumer->provider;
304 }
305 while ((cbp = bioq_takefirst(&queue)) != NULL) {
306 G_CONCAT_LOGREQ(cbp, "Sending request.");
307 cp = cbp->bio_caller1;
308 cbp->bio_caller1 = NULL;
309 g_io_request(cbp, cp);
310 }
311 }
312
313 static void
g_concat_start(struct bio * bp)314 g_concat_start(struct bio *bp)
315 {
316 struct bio_queue_head queue;
317 struct g_concat_softc *sc;
318 struct g_concat_disk *disk;
319 struct g_provider *pp;
320 off_t offset, end, length, off, len;
321 struct bio *cbp;
322 char *addr;
323 u_int no;
324
325 pp = bp->bio_to;
326 sc = pp->geom->softc;
327 /*
328 * If sc == NULL, provider's error should be set and g_concat_start()
329 * should not be called at all.
330 */
331 KASSERT(sc != NULL,
332 ("Provider's error should be set (error=%d)(device=%s).",
333 bp->bio_to->error, bp->bio_to->name));
334
335 G_CONCAT_LOGREQ(bp, "Request received.");
336
337 switch (bp->bio_cmd) {
338 case BIO_READ:
339 case BIO_WRITE:
340 case BIO_DELETE:
341 break;
342 case BIO_FLUSH:
343 g_concat_flush(sc, bp);
344 return;
345 case BIO_GETATTR:
346 if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
347 g_concat_kernel_dump(bp);
348 return;
349 } else if (strcmp("GEOM::candelete", bp->bio_attribute) == 0) {
350 g_concat_candelete(bp);
351 return;
352 }
353 /* To which provider it should be delivered? */
354 /* FALLTHROUGH */
355 default:
356 g_io_deliver(bp, EOPNOTSUPP);
357 return;
358 }
359
360 offset = bp->bio_offset;
361 length = bp->bio_length;
362 if ((bp->bio_flags & BIO_UNMAPPED) != 0)
363 addr = NULL;
364 else
365 addr = bp->bio_data;
366 end = offset + length;
367
368 bioq_init(&queue);
369 for (no = 0; no < sc->sc_ndisks; no++) {
370 disk = &sc->sc_disks[no];
371 if (disk->d_end <= offset)
372 continue;
373 if (disk->d_start >= end)
374 break;
375
376 off = offset - disk->d_start;
377 len = MIN(length, disk->d_end - offset);
378 length -= len;
379 offset += len;
380
381 cbp = g_clone_bio(bp);
382 if (cbp == NULL) {
383 while ((cbp = bioq_takefirst(&queue)) != NULL)
384 g_destroy_bio(cbp);
385 if (bp->bio_error == 0)
386 bp->bio_error = ENOMEM;
387 g_io_deliver(bp, bp->bio_error);
388 return;
389 }
390 bioq_insert_tail(&queue, cbp);
391 /*
392 * Fill in the component buf structure.
393 */
394 if (len == bp->bio_length)
395 cbp->bio_done = g_std_done;
396 else
397 cbp->bio_done = g_concat_done;
398 cbp->bio_offset = off;
399 cbp->bio_length = len;
400 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
401 cbp->bio_ma_offset += (uintptr_t)addr;
402 cbp->bio_ma += cbp->bio_ma_offset / PAGE_SIZE;
403 cbp->bio_ma_offset %= PAGE_SIZE;
404 cbp->bio_ma_n = round_page(cbp->bio_ma_offset +
405 cbp->bio_length) / PAGE_SIZE;
406 } else
407 cbp->bio_data = addr;
408 addr += len;
409 cbp->bio_to = disk->d_consumer->provider;
410 cbp->bio_caller1 = disk;
411
412 if (length == 0)
413 break;
414 }
415 KASSERT(length == 0,
416 ("Length is still greater than 0 (class=%s, name=%s).",
417 bp->bio_to->geom->class->name, bp->bio_to->geom->name));
418 while ((cbp = bioq_takefirst(&queue)) != NULL) {
419 G_CONCAT_LOGREQ(cbp, "Sending request.");
420 disk = cbp->bio_caller1;
421 cbp->bio_caller1 = NULL;
422 g_io_request(cbp, disk->d_consumer);
423 }
424 }
425
426 static void
g_concat_check_and_run(struct g_concat_softc * sc)427 g_concat_check_and_run(struct g_concat_softc *sc)
428 {
429 struct g_concat_disk *disk;
430 struct g_provider *dp, *pp;
431 u_int no, sectorsize = 0;
432 off_t start;
433 int error;
434
435 g_topology_assert();
436 if (g_concat_nvalid(sc) != sc->sc_ndisks)
437 return;
438
439 pp = g_new_providerf(sc->sc_geom, "concat/%s", sc->sc_name);
440 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE |
441 G_PF_ACCEPT_UNMAPPED;
442 start = 0;
443 for (no = 0; no < sc->sc_ndisks; no++) {
444 disk = &sc->sc_disks[no];
445 dp = disk->d_consumer->provider;
446 disk->d_start = start;
447 disk->d_end = disk->d_start + dp->mediasize;
448 if (sc->sc_type == G_CONCAT_TYPE_AUTOMATIC)
449 disk->d_end -= dp->sectorsize;
450 start = disk->d_end;
451 error = g_access(disk->d_consumer, 1, 0, 0);
452 if (error == 0) {
453 error = g_getattr("GEOM::candelete", disk->d_consumer,
454 &disk->d_candelete);
455 if (error != 0)
456 disk->d_candelete = 0;
457 (void)g_access(disk->d_consumer, -1, 0, 0);
458 } else
459 G_CONCAT_DEBUG(1, "Failed to access disk %s, error %d.",
460 dp->name, error);
461 if (no == 0)
462 sectorsize = dp->sectorsize;
463 else
464 sectorsize = lcm(sectorsize, dp->sectorsize);
465
466 /* A provider underneath us doesn't support unmapped */
467 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
468 G_CONCAT_DEBUG(1, "Cancelling unmapped "
469 "because of %s.", dp->name);
470 pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
471 }
472 }
473 pp->sectorsize = sectorsize;
474 /* We have sc->sc_disks[sc->sc_ndisks - 1].d_end in 'start'. */
475 pp->mediasize = start;
476 pp->stripesize = sc->sc_disks[0].d_consumer->provider->stripesize;
477 pp->stripeoffset = sc->sc_disks[0].d_consumer->provider->stripeoffset;
478 sc->sc_provider = pp;
479 g_error_provider(pp, 0);
480
481 G_CONCAT_DEBUG(0, "Device %s activated.", sc->sc_provider->name);
482 }
483
484 static int
g_concat_read_metadata(struct g_consumer * cp,struct g_concat_metadata * md)485 g_concat_read_metadata(struct g_consumer *cp, struct g_concat_metadata *md)
486 {
487 struct g_provider *pp;
488 u_char *buf;
489 int error;
490
491 g_topology_assert();
492
493 error = g_access(cp, 1, 0, 0);
494 if (error != 0)
495 return (error);
496 pp = cp->provider;
497 g_topology_unlock();
498 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
499 &error);
500 g_topology_lock();
501 g_access(cp, -1, 0, 0);
502 if (buf == NULL)
503 return (error);
504
505 /* Decode metadata. */
506 concat_metadata_decode(buf, md);
507 g_free(buf);
508
509 return (0);
510 }
511
512 /*
513 * Add disk to given device.
514 */
515 static int
g_concat_add_disk(struct g_concat_softc * sc,struct g_provider * pp,u_int no)516 g_concat_add_disk(struct g_concat_softc *sc, struct g_provider *pp, u_int no)
517 {
518 struct g_concat_disk *disk;
519 struct g_consumer *cp, *fcp;
520 struct g_geom *gp;
521 int error;
522
523 g_topology_assert();
524 /* Metadata corrupted? */
525 if (no >= sc->sc_ndisks)
526 return (EINVAL);
527
528 disk = &sc->sc_disks[no];
529 /* Check if disk is not already attached. */
530 if (disk->d_consumer != NULL)
531 return (EEXIST);
532
533 gp = sc->sc_geom;
534 fcp = LIST_FIRST(&gp->consumer);
535
536 cp = g_new_consumer(gp);
537 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
538 error = g_attach(cp, pp);
539 if (error != 0) {
540 g_destroy_consumer(cp);
541 return (error);
542 }
543
544 if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
545 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
546 if (error != 0) {
547 g_detach(cp);
548 g_destroy_consumer(cp);
549 return (error);
550 }
551 }
552 if (sc->sc_type == G_CONCAT_TYPE_AUTOMATIC) {
553 struct g_concat_metadata md;
554
555 /* Re-read metadata. */
556 error = g_concat_read_metadata(cp, &md);
557 if (error != 0)
558 goto fail;
559
560 if (strcmp(md.md_magic, G_CONCAT_MAGIC) != 0 ||
561 strcmp(md.md_name, sc->sc_name) != 0 ||
562 md.md_id != sc->sc_id) {
563 G_CONCAT_DEBUG(0, "Metadata on %s changed.", pp->name);
564 goto fail;
565 }
566 }
567
568 cp->private = disk;
569 disk->d_consumer = cp;
570 disk->d_softc = sc;
571 disk->d_start = 0; /* not yet */
572 disk->d_end = 0; /* not yet */
573 disk->d_removed = 0;
574
575 G_CONCAT_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
576
577 g_concat_check_and_run(sc);
578
579 return (0);
580 fail:
581 if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
582 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
583 g_detach(cp);
584 g_destroy_consumer(cp);
585 return (error);
586 }
587
588 static struct g_geom *
g_concat_create(struct g_class * mp,const struct g_concat_metadata * md,u_int type)589 g_concat_create(struct g_class *mp, const struct g_concat_metadata *md,
590 u_int type)
591 {
592 struct g_concat_softc *sc;
593 struct g_geom *gp;
594 u_int no;
595
596 G_CONCAT_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
597 md->md_id);
598
599 /* One disks is minimum. */
600 if (md->md_all < 1)
601 return (NULL);
602
603 /* Check for duplicate unit */
604 LIST_FOREACH(gp, &mp->geom, geom) {
605 sc = gp->softc;
606 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
607 G_CONCAT_DEBUG(0, "Device %s already configured.",
608 gp->name);
609 return (NULL);
610 }
611 }
612 gp = g_new_geomf(mp, "%s", md->md_name);
613 sc = malloc(sizeof(*sc), M_CONCAT, M_WAITOK | M_ZERO);
614 gp->start = g_concat_start;
615 gp->spoiled = g_concat_orphan;
616 gp->orphan = g_concat_orphan;
617 gp->access = g_concat_access;
618 gp->dumpconf = g_concat_dumpconf;
619
620 sc->sc_id = md->md_id;
621 sc->sc_ndisks = md->md_all;
622 sc->sc_disks = malloc(sizeof(struct g_concat_disk) * sc->sc_ndisks,
623 M_CONCAT, M_WAITOK | M_ZERO);
624 for (no = 0; no < sc->sc_ndisks; no++)
625 sc->sc_disks[no].d_consumer = NULL;
626 sc->sc_type = type;
627 mtx_init(&sc->sc_lock, "gconcat lock", NULL, MTX_DEF);
628
629 gp->softc = sc;
630 sc->sc_geom = gp;
631 sc->sc_provider = NULL;
632
633 G_CONCAT_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
634
635 return (gp);
636 }
637
638 static int
g_concat_destroy(struct g_concat_softc * sc,boolean_t force)639 g_concat_destroy(struct g_concat_softc *sc, boolean_t force)
640 {
641 struct g_provider *pp;
642 struct g_consumer *cp, *cp1;
643 struct g_geom *gp;
644
645 g_topology_assert();
646
647 if (sc == NULL)
648 return (ENXIO);
649
650 pp = sc->sc_provider;
651 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
652 if (force) {
653 G_CONCAT_DEBUG(0, "Device %s is still open, so it "
654 "can't be definitely removed.", pp->name);
655 } else {
656 G_CONCAT_DEBUG(1,
657 "Device %s is still open (r%dw%de%d).", pp->name,
658 pp->acr, pp->acw, pp->ace);
659 return (EBUSY);
660 }
661 }
662
663 gp = sc->sc_geom;
664 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) {
665 g_concat_remove_disk(cp->private);
666 if (cp1 == NULL)
667 return (0); /* Recursion happened. */
668 }
669 if (!LIST_EMPTY(&gp->consumer))
670 return (EINPROGRESS);
671
672 gp->softc = NULL;
673 KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
674 gp->name));
675 free(sc->sc_disks, M_CONCAT);
676 mtx_destroy(&sc->sc_lock);
677 free(sc, M_CONCAT);
678
679 G_CONCAT_DEBUG(0, "Device %s destroyed.", gp->name);
680 g_wither_geom(gp, ENXIO);
681 return (0);
682 }
683
684 static int
g_concat_destroy_geom(struct gctl_req * req __unused,struct g_class * mp __unused,struct g_geom * gp)685 g_concat_destroy_geom(struct gctl_req *req __unused,
686 struct g_class *mp __unused, struct g_geom *gp)
687 {
688 struct g_concat_softc *sc;
689
690 sc = gp->softc;
691 return (g_concat_destroy(sc, 0));
692 }
693
694 static struct g_geom *
g_concat_taste(struct g_class * mp,struct g_provider * pp,int flags __unused)695 g_concat_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
696 {
697 struct g_concat_metadata md;
698 struct g_concat_softc *sc;
699 struct g_consumer *cp;
700 struct g_geom *gp;
701 int error;
702
703 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
704 g_topology_assert();
705
706 /* Skip providers that are already open for writing. */
707 if (pp->acw > 0)
708 return (NULL);
709
710 G_CONCAT_DEBUG(3, "Tasting %s.", pp->name);
711
712 gp = g_new_geomf(mp, "concat:taste");
713 gp->start = g_concat_start;
714 gp->access = g_concat_access;
715 gp->orphan = g_concat_orphan;
716 cp = g_new_consumer(gp);
717 g_attach(cp, pp);
718 error = g_concat_read_metadata(cp, &md);
719 g_detach(cp);
720 g_destroy_consumer(cp);
721 g_destroy_geom(gp);
722 if (error != 0)
723 return (NULL);
724 gp = NULL;
725
726 if (strcmp(md.md_magic, G_CONCAT_MAGIC) != 0)
727 return (NULL);
728 if (md.md_version > G_CONCAT_VERSION) {
729 printf("geom_concat.ko module is too old to handle %s.\n",
730 pp->name);
731 return (NULL);
732 }
733 /*
734 * Backward compatibility:
735 */
736 /* There was no md_provider field in earlier versions of metadata. */
737 if (md.md_version < 3)
738 bzero(md.md_provider, sizeof(md.md_provider));
739 /* There was no md_provsize field in earlier versions of metadata. */
740 if (md.md_version < 4)
741 md.md_provsize = pp->mediasize;
742
743 if (md.md_provider[0] != '\0' &&
744 !g_compare_names(md.md_provider, pp->name))
745 return (NULL);
746 if (md.md_provsize != pp->mediasize)
747 return (NULL);
748
749 /*
750 * Let's check if device already exists.
751 */
752 sc = NULL;
753 LIST_FOREACH(gp, &mp->geom, geom) {
754 sc = gp->softc;
755 if (sc == NULL)
756 continue;
757 if (sc->sc_type != G_CONCAT_TYPE_AUTOMATIC)
758 continue;
759 if (strcmp(md.md_name, sc->sc_name) != 0)
760 continue;
761 if (md.md_id != sc->sc_id)
762 continue;
763 break;
764 }
765 if (gp != NULL) {
766 G_CONCAT_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
767 error = g_concat_add_disk(sc, pp, md.md_no);
768 if (error != 0) {
769 G_CONCAT_DEBUG(0,
770 "Cannot add disk %s to %s (error=%d).", pp->name,
771 gp->name, error);
772 return (NULL);
773 }
774 } else {
775 gp = g_concat_create(mp, &md, G_CONCAT_TYPE_AUTOMATIC);
776 if (gp == NULL) {
777 G_CONCAT_DEBUG(0, "Cannot create device %s.",
778 md.md_name);
779 return (NULL);
780 }
781 sc = gp->softc;
782 G_CONCAT_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
783 error = g_concat_add_disk(sc, pp, md.md_no);
784 if (error != 0) {
785 G_CONCAT_DEBUG(0,
786 "Cannot add disk %s to %s (error=%d).", pp->name,
787 gp->name, error);
788 g_concat_destroy(sc, 1);
789 return (NULL);
790 }
791 }
792
793 return (gp);
794 }
795
796 static void
g_concat_ctl_create(struct gctl_req * req,struct g_class * mp)797 g_concat_ctl_create(struct gctl_req *req, struct g_class *mp)
798 {
799 u_int attached, no;
800 struct g_concat_metadata md;
801 struct g_provider *pp;
802 struct g_concat_softc *sc;
803 struct g_geom *gp;
804 struct sbuf *sb;
805 const char *name;
806 char param[16];
807 int *nargs;
808
809 g_topology_assert();
810 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
811 if (nargs == NULL) {
812 gctl_error(req, "No '%s' argument.", "nargs");
813 return;
814 }
815 if (*nargs < 2) {
816 gctl_error(req, "Too few arguments.");
817 return;
818 }
819
820 strlcpy(md.md_magic, G_CONCAT_MAGIC, sizeof(md.md_magic));
821 md.md_version = G_CONCAT_VERSION;
822 name = gctl_get_asciiparam(req, "arg0");
823 if (name == NULL) {
824 gctl_error(req, "No 'arg%u' argument.", 0);
825 return;
826 }
827 strlcpy(md.md_name, name, sizeof(md.md_name));
828 md.md_id = arc4random();
829 md.md_no = 0;
830 md.md_all = *nargs - 1;
831 bzero(md.md_provider, sizeof(md.md_provider));
832 /* This field is not important here. */
833 md.md_provsize = 0;
834
835 /* Check all providers are valid */
836 for (no = 1; no < *nargs; no++) {
837 snprintf(param, sizeof(param), "arg%u", no);
838 name = gctl_get_asciiparam(req, param);
839 if (name == NULL) {
840 gctl_error(req, "No 'arg%u' argument.", no);
841 return;
842 }
843 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
844 name += strlen("/dev/");
845 pp = g_provider_by_name(name);
846 if (pp == NULL) {
847 G_CONCAT_DEBUG(1, "Disk %s is invalid.", name);
848 gctl_error(req, "Disk %s is invalid.", name);
849 return;
850 }
851 }
852
853 gp = g_concat_create(mp, &md, G_CONCAT_TYPE_MANUAL);
854 if (gp == NULL) {
855 gctl_error(req, "Can't configure %s.", md.md_name);
856 return;
857 }
858
859 sc = gp->softc;
860 sb = sbuf_new_auto();
861 sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
862 for (attached = 0, no = 1; no < *nargs; no++) {
863 snprintf(param, sizeof(param), "arg%u", no);
864 name = gctl_get_asciiparam(req, param);
865 if (name == NULL) {
866 gctl_error(req, "No 'arg%d' argument.", no);
867 return;
868 }
869 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
870 name += strlen("/dev/");
871 pp = g_provider_by_name(name);
872 KASSERT(pp != NULL, ("Provider %s disappear?!", name));
873 if (g_concat_add_disk(sc, pp, no - 1) != 0) {
874 G_CONCAT_DEBUG(1, "Disk %u (%s) not attached to %s.",
875 no, pp->name, gp->name);
876 sbuf_printf(sb, " %s", pp->name);
877 continue;
878 }
879 attached++;
880 }
881 sbuf_finish(sb);
882 if (md.md_all != attached) {
883 g_concat_destroy(gp->softc, 1);
884 gctl_error(req, "%s", sbuf_data(sb));
885 }
886 sbuf_delete(sb);
887 }
888
889 static struct g_concat_softc *
g_concat_find_device(struct g_class * mp,const char * name)890 g_concat_find_device(struct g_class *mp, const char *name)
891 {
892 struct g_concat_softc *sc;
893 struct g_geom *gp;
894
895 LIST_FOREACH(gp, &mp->geom, geom) {
896 sc = gp->softc;
897 if (sc == NULL)
898 continue;
899 if (strcmp(sc->sc_name, name) == 0)
900 return (sc);
901 }
902 return (NULL);
903 }
904
905 static void
g_concat_ctl_destroy(struct gctl_req * req,struct g_class * mp)906 g_concat_ctl_destroy(struct gctl_req *req, struct g_class *mp)
907 {
908 struct g_concat_softc *sc;
909 int *force, *nargs, error;
910 const char *name;
911 char param[16];
912 u_int i;
913
914 g_topology_assert();
915
916 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
917 if (nargs == NULL) {
918 gctl_error(req, "No '%s' argument.", "nargs");
919 return;
920 }
921 if (*nargs <= 0) {
922 gctl_error(req, "Missing device(s).");
923 return;
924 }
925 force = gctl_get_paraml(req, "force", sizeof(*force));
926 if (force == NULL) {
927 gctl_error(req, "No '%s' argument.", "force");
928 return;
929 }
930
931 for (i = 0; i < (u_int)*nargs; i++) {
932 snprintf(param, sizeof(param), "arg%u", i);
933 name = gctl_get_asciiparam(req, param);
934 if (name == NULL) {
935 gctl_error(req, "No 'arg%u' argument.", i);
936 return;
937 }
938 sc = g_concat_find_device(mp, name);
939 if (sc == NULL) {
940 gctl_error(req, "No such device: %s.", name);
941 return;
942 }
943 error = g_concat_destroy(sc, *force);
944 if (error != 0) {
945 gctl_error(req, "Cannot destroy device %s (error=%d).",
946 sc->sc_name, error);
947 return;
948 }
949 }
950 }
951
952 static void
g_concat_config(struct gctl_req * req,struct g_class * mp,const char * verb)953 g_concat_config(struct gctl_req *req, struct g_class *mp, const char *verb)
954 {
955 uint32_t *version;
956
957 g_topology_assert();
958
959 version = gctl_get_paraml(req, "version", sizeof(*version));
960 if (version == NULL) {
961 gctl_error(req, "No '%s' argument.", "version");
962 return;
963 }
964 if (*version != G_CONCAT_VERSION) {
965 gctl_error(req, "Userland and kernel parts are out of sync.");
966 return;
967 }
968
969 if (strcmp(verb, "create") == 0) {
970 g_concat_ctl_create(req, mp);
971 return;
972 } else if (strcmp(verb, "destroy") == 0 ||
973 strcmp(verb, "stop") == 0) {
974 g_concat_ctl_destroy(req, mp);
975 return;
976 }
977 gctl_error(req, "Unknown verb.");
978 }
979
980 static void
g_concat_dumpconf(struct sbuf * sb,const char * indent,struct g_geom * gp,struct g_consumer * cp,struct g_provider * pp)981 g_concat_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
982 struct g_consumer *cp, struct g_provider *pp)
983 {
984 struct g_concat_softc *sc;
985
986 g_topology_assert();
987 sc = gp->softc;
988 if (sc == NULL)
989 return;
990 if (pp != NULL) {
991 /* Nothing here. */
992 } else if (cp != NULL) {
993 struct g_concat_disk *disk;
994
995 disk = cp->private;
996 if (disk == NULL)
997 return;
998 sbuf_printf(sb, "%s<End>%jd</End>\n", indent,
999 (intmax_t)disk->d_end);
1000 sbuf_printf(sb, "%s<Start>%jd</Start>\n", indent,
1001 (intmax_t)disk->d_start);
1002 } else {
1003 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
1004 sbuf_printf(sb, "%s<Type>", indent);
1005 switch (sc->sc_type) {
1006 case G_CONCAT_TYPE_AUTOMATIC:
1007 sbuf_cat(sb, "AUTOMATIC");
1008 break;
1009 case G_CONCAT_TYPE_MANUAL:
1010 sbuf_cat(sb, "MANUAL");
1011 break;
1012 default:
1013 sbuf_cat(sb, "UNKNOWN");
1014 break;
1015 }
1016 sbuf_cat(sb, "</Type>\n");
1017 sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
1018 indent, sc->sc_ndisks, g_concat_nvalid(sc));
1019 sbuf_printf(sb, "%s<State>", indent);
1020 if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
1021 sbuf_cat(sb, "UP");
1022 else
1023 sbuf_cat(sb, "DOWN");
1024 sbuf_cat(sb, "</State>\n");
1025 }
1026 }
1027
1028 DECLARE_GEOM_CLASS(g_concat_class, g_concat);
1029 MODULE_VERSION(geom_concat, 0);
1030