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/stripe/g_stripe.h>
41
42
43static MALLOC_DEFINE(M_STRIPE, "stripe data", "GEOM_STRIPE Data");
44
45SYSCTL_DECL(_kern_geom);
46SYSCTL_NODE(_kern_geom, OID_AUTO, stripe, CTLFLAG_RW, 0, "GEOM_STRIPE stuff");
47static u_int g_stripe_debug = 0;
48SYSCTL_UINT(_kern_geom_stripe, OID_AUTO, debug, CTLFLAG_RW, &g_stripe_debug, 0,
49 "Debug level");
50
51static int g_stripe_destroy(struct g_stripe_softc *sc, boolean_t force);
52static int g_stripe_destroy_geom(struct gctl_req *req, struct g_class *mp,
53 struct g_geom *gp);
54
55static g_taste_t g_stripe_taste;
56static g_ctl_req_t g_stripe_config;
57static g_dumpconf_t g_stripe_dumpconf;
58
59struct g_class g_stripe_class = {
60 .name = G_STRIPE_CLASS_NAME,
61 .ctlreq = g_stripe_config,
62 .taste = g_stripe_taste,
63 .destroy_geom = g_stripe_destroy_geom
64};
65
66
67/*
68 * Greatest Common Divisor.
69 */
70static u_int
71gcd(u_int a, u_int b)
72{
73 u_int c;
74
75 while (b != 0) {
76 c = a;
77 a = b;
78 b = (c % b);
79 }
80 return (a);
81}
82
83/*
84 * Least Common Multiple.
85 */
86static u_int
87lcm(u_int a, u_int b)
88{
89
90 return ((a * b) / gcd(a, b));
91}
92
93/*
94 * Return the number of valid disks.
95 */
96static u_int
97g_stripe_nvalid(struct g_stripe_softc *sc)
98{
99 u_int i, no;
100
101 no = 0;
102 for (i = 0; i < sc->sc_ndisks; i++) {
103 if (sc->sc_disks[i] != NULL)
104 no++;
105 }
106
107 return (no);
108}
109
110static void
111g_stripe_remove_disk(struct g_consumer *cp)
112{
113 struct g_stripe_softc *sc;
114 u_int no;
115
116 KASSERT(cp != NULL, ("Non-valid disk in %s.", __func__));
117 sc = (struct g_stripe_softc *)cp->private;
118 KASSERT(sc != NULL, ("NULL sc in %s.", __func__));
119 no = cp->index;
120
121 G_STRIPE_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
122 sc->sc_geom->name);
123
124 sc->sc_disks[no] = NULL;
125 if (sc->sc_provider != NULL) {
126 g_orphan_provider(sc->sc_provider, ENXIO);
127 sc->sc_provider = NULL;
128 G_STRIPE_DEBUG(0, "Device %s removed.", sc->sc_geom->name);
129 }
130
131 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
132 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
133 g_detach(cp);
134 g_destroy_consumer(cp);
135}
136
137static void
138g_stripe_orphan(struct g_consumer *cp)
139{
140 struct g_stripe_softc *sc;
141 struct g_geom *gp;
142
143 g_topology_assert();
144 gp = cp->geom;
145 sc = gp->softc;
146 if (sc == NULL)
147 return;
148
149 g_stripe_remove_disk(cp);
150 /* If there are no valid disks anymore, remove device. */
151 if (g_stripe_nvalid(sc) == 0)
152 g_stripe_destroy(sc, 1);
153}
154
155static int
156g_stripe_access(struct g_provider *pp, int dr, int dw, int de)
157{
158 struct g_consumer *cp1, *cp2;
159 struct g_stripe_softc *sc;
160 struct g_geom *gp;
161 int error;
162
163 gp = pp->geom;
164 sc = gp->softc;
165
166 if (sc == NULL) {
167 /*
168 * It looks like geom is being withered.
169 * In that case we allow only negative requests.
170 */
171 KASSERT(dr <= 0 && dw <= 0 && de <= 0,
172 ("Positive access request (device=%s).", pp->name));
173 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 &&
174 (pp->ace + de) == 0) {
175 G_STRIPE_DEBUG(0, "Device %s definitely destroyed.",
176 gp->name);
177 }
178 return (0);
179 }
180
181 /* On first open, grab an extra "exclusive" bit */
182 if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
183 de++;
184 /* ... and let go of it on last close */
185 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
186 de--;
187
188 error = ENXIO;
189 LIST_FOREACH(cp1, &gp->consumer, consumer) {
190 error = g_access(cp1, dr, dw, de);
191 if (error == 0)
192 continue;
193 /*
194 * If we fail here, backout all previous changes.
195 */
196 LIST_FOREACH(cp2, &gp->consumer, consumer) {
197 if (cp1 == cp2)
198 return (error);
199 g_access(cp2, -dr, -dw, -de);
200 }
201 /* NOTREACHED */
202 }
203
204 return (error);
205}
206
207static void
208g_stripe_start(struct bio *bp)
209{
210 struct g_provider *pp;
211 struct g_stripe_softc *sc;
212 off_t off, start, length, nstripe;
213 struct bio *cbp;
214 u_int sectorsize;
215 uint32_t stripesize;
216 uint16_t no;
217 char *addr;
218
219 pp = bp->bio_to;
220 sc = pp->geom->softc;
221 /*
222 * If sc == NULL, provider's error should be set and g_stripe_start()
223 * should not be called at all.
224 */
225 KASSERT(sc != NULL,
226 ("Provider's error should be set (error=%d)(device=%s).",
227 bp->bio_to->error, bp->bio_to->name));
228
229 G_STRIPE_LOGREQ(bp, "Request received.");
230
231 switch (bp->bio_cmd) {
232 case BIO_READ:
233 case BIO_WRITE:
234 case BIO_DELETE:
235 /*
236 * Only those requests are supported.
237 */
238 break;
239 case BIO_GETATTR:
240 /* To which provider it should be delivered? */
241 default:
242 g_io_deliver(bp, EOPNOTSUPP);
243 return;
244 }
245
246 addr = bp->bio_data;
247 sectorsize = sc->sc_provider->sectorsize;
248 stripesize = sc->sc_stripesize;
249
250 /*
251 * Calcucations are quite messy, but fast I hope.
252 */
253
254 /* Stripe number. */
255 /* nstripe = bp->bio_offset / stripesize; */
256 nstripe = bp->bio_offset >> (off_t)sc->sc_stripebits;
257 /* Disk number. */
258 no = nstripe % sc->sc_ndisks;
259 /* Start position in stripe. */
260 /* start = bp->bio_offset % stripesize; */
261 start = bp->bio_offset & (stripesize - 1);
262 /* Start position in disk. */
263 /* off = (nstripe / sc->sc_ndisks) * stripesize + start; */
264 off = ((nstripe / sc->sc_ndisks) << sc->sc_stripebits) + start;
265 /* Length of data to operate. */
266 length = MIN(bp->bio_length, stripesize - start);
267
268 cbp = g_clone_bio(bp);
269 if (cbp == NULL) {
270 /*
271 * Deny all request. This is pointless
272 * to split rest of the request, bacause
273 * we're setting bio_error here, so all
274 * request will be denied, anyway.
275 */
276 bp->bio_completed = bp->bio_length;
277 if (bp->bio_error == 0)
278 bp->bio_error = ENOMEM;
279 g_io_deliver(bp, bp->bio_error);
280 return;
281 }
282 /*
283 * Fill in the component buf structure.
284 */
285 cbp->bio_done = g_std_done;
286 cbp->bio_offset = off;
287 cbp->bio_data = addr;
288 cbp->bio_length = length;
289 cbp->bio_to = sc->sc_disks[no]->provider;
290 G_STRIPE_LOGREQ(cbp, "Sending request.");
291 g_io_request(cbp, sc->sc_disks[no]);
292
293 /* off -= off % stripesize; */
294 off -= off & (stripesize - 1);
295 addr += length;
296 length = bp->bio_length - length;
297 for (no++; length > 0; no++, length -= stripesize, addr += stripesize) {
298 if (no > sc->sc_ndisks - 1) {
299 no = 0;
300 off += stripesize;
301 }
302 cbp = g_clone_bio(bp);
303 if (cbp == NULL) {
304 /*
305 * Deny remaining part. This is pointless
306 * to split rest of the request, bacause
307 * we're setting bio_error here, so all
308 * request will be denied, anyway.
309 */
310 bp->bio_completed += length;
311 if (bp->bio_error == 0)
312 bp->bio_error = ENOMEM;
313 if (bp->bio_completed == bp->bio_length)
314 g_io_deliver(bp, bp->bio_error);
315 return;
316 }
317
318 /*
319 * Fill in the component buf structure.
320 */
321 cbp->bio_done = g_std_done;
322 cbp->bio_offset = off;
323 cbp->bio_data = addr;
324 /*
325 * MIN() is in case when
326 * (bp->bio_length % sc->sc_stripesize) != 0.
327 */
328 cbp->bio_length = MIN(stripesize, length);
329
330 cbp->bio_to = sc->sc_disks[no]->provider;
331 G_STRIPE_LOGREQ(cbp, "Sending request.");
332 g_io_request(cbp, sc->sc_disks[no]);
333 }
334}
335
336static void
337g_stripe_check_and_run(struct g_stripe_softc *sc)
338{
339 off_t mediasize, ms;
340 u_int no, sectorsize = 0;
341
342 if (g_stripe_nvalid(sc) != sc->sc_ndisks)
343 return;
344
345 sc->sc_provider = g_new_providerf(sc->sc_geom, "%s", sc->sc_geom->name);
346 /*
347 * Find the smallest disk.
348 */
349 mediasize = sc->sc_disks[0]->provider->mediasize;
350 if (sc->sc_type == G_STRIPE_TYPE_AUTOMATIC)
351 mediasize -= sc->sc_disks[0]->provider->sectorsize;
352 mediasize -= mediasize % sc->sc_stripesize;
353 sectorsize = sc->sc_disks[0]->provider->sectorsize;
354 for (no = 1; no < sc->sc_ndisks; no++) {
355 ms = sc->sc_disks[no]->provider->mediasize;
356 if (sc->sc_type == G_STRIPE_TYPE_AUTOMATIC)
357 ms -= sc->sc_disks[no]->provider->sectorsize;
358 ms -= ms % sc->sc_stripesize;
359 if (ms < mediasize)
360 mediasize = ms;
361 sectorsize = lcm(sectorsize,
362 sc->sc_disks[no]->provider->sectorsize);
363 }
364 sc->sc_provider->sectorsize = sectorsize;
365 sc->sc_provider->mediasize = mediasize * sc->sc_ndisks;
366 g_error_provider(sc->sc_provider, 0);
367
368 G_STRIPE_DEBUG(0, "Device %s activated.", sc->sc_geom->name);
369}
370
371static int
372g_stripe_read_metadata(struct g_consumer *cp, struct g_stripe_metadata *md)
373{
374 struct g_provider *pp;
375 u_char *buf;
376 int error;
377
378 g_topology_assert();
379
380 error = g_access(cp, 1, 0, 0);
381 if (error != 0)
382 return (error);
383 pp = cp->provider;
384 g_topology_unlock();
385 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
386 &error);
387 g_topology_lock();
388 g_access(cp, -1, 0, 0);
389 if (buf == NULL)
390 return (error);
391
392 /* Decode metadata. */
393 stripe_metadata_decode(buf, md);
394 g_free(buf);
395
396 return (0);
397}
398
399/*
400 * Add disk to given device.
401 */
402static int
403g_stripe_add_disk(struct g_stripe_softc *sc, struct g_provider *pp, u_int no)
404{
405 struct g_consumer *cp, *fcp;
406 struct g_geom *gp;
407 int error;
408
409 /* Metadata corrupted? */
410 if (no >= sc->sc_ndisks)
411 return (EINVAL);
412
413 /* Check if disk is not already attached. */
414 if (sc->sc_disks[no] != NULL)
415 return (EEXIST);
416
417 gp = sc->sc_geom;
418 fcp = LIST_FIRST(&gp->consumer);
419
420 cp = g_new_consumer(gp);
421 error = g_attach(cp, pp);
422 if (error != 0) {
423 g_destroy_consumer(cp);
424 return (error);
425 }
426
427 if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
428 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
429 if (error != 0) {
430 g_detach(cp);
431 g_destroy_consumer(cp);
432 return (error);
433 }
434 }
435 if (sc->sc_type == G_STRIPE_TYPE_AUTOMATIC) {
436 struct g_stripe_metadata md;
437
438 /* Reread metadata. */
439 error = g_stripe_read_metadata(cp, &md);
440 if (error != 0)
441 goto fail;
442
443 if (strcmp(md.md_magic, G_STRIPE_MAGIC) != 0 ||
444 strcmp(md.md_name, sc->sc_name) != 0 ||
445 md.md_id != sc->sc_id) {
446 G_STRIPE_DEBUG(0, "Metadata on %s changed.", pp->name);
447 goto fail;
448 }
449 }
450
451 cp->private = sc;
452 cp->index = no;
453 sc->sc_disks[no] = cp;
454
455 G_STRIPE_DEBUG(0, "Disk %s attached to %s.", pp->name, gp->name);
456
457 g_stripe_check_and_run(sc);
458
459 return (0);
460fail:
461 if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
462 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
463 g_detach(cp);
464 g_destroy_consumer(cp);
465 return (error);
466}
467
468static struct g_geom *
469g_stripe_create(struct g_class *mp, const struct g_stripe_metadata *md,
470 u_int type)
471{
472 struct g_stripe_softc *sc;
473 struct g_geom *gp;
474 u_int no;
475
476 G_STRIPE_DEBUG(1, "Creating device %s.stripe (id=%u).", md->md_name,
477 md->md_id);
478
479 /* Two disks is minimum. */
480 if (md->md_all <= 1) {
481 G_STRIPE_DEBUG(0, "Too few disks defined for %s.stripe.",
482 md->md_name);
483 return (NULL);
484 }
485#if 0
486 /* Stripe size have to be grater than or equal to sector size. */
487 if (md->md_stripesize < sectorsize) {
488 G_STRIPE_DEBUG(0, "Invalid stripe size for %s.stripe.",
489 md->md_name);
490 return (NULL);
491 }
492#endif
493 /* Stripe size have to be power of 2. */
494 if (!powerof2(md->md_stripesize)) {
495 G_STRIPE_DEBUG(0, "Invalid stripe size for %s.stripe.",
496 md->md_name);
497 return (NULL);
498 }
499
500 /* Check for duplicate unit */
501 LIST_FOREACH(gp, &mp->geom, geom) {
502 sc = gp->softc;
503 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
504 G_STRIPE_DEBUG(0, "Device %s already configured.",
505 gp->name);
506 return (NULL);
507 }
508 }
509 gp = g_new_geomf(mp, "%s.stripe", md->md_name);
510 gp->softc = NULL; /* for a moment */
511
512 sc = malloc(sizeof(*sc), M_STRIPE, M_NOWAIT | M_ZERO);
513 if (sc == NULL) {
514 G_STRIPE_DEBUG(0, "Can't allocate memory for device %s.",
515 gp->name);
516 g_destroy_geom(gp);
517 return (NULL);
518 }
519
520 gp->start = g_stripe_start;
521 gp->spoiled = g_stripe_orphan;
522 gp->orphan = g_stripe_orphan;
523 gp->access = g_stripe_access;
524 gp->dumpconf = g_stripe_dumpconf;
525
526 strlcpy(sc->sc_name, md->md_name, sizeof(sc->sc_name));
527 sc->sc_id = md->md_id;
528 sc->sc_stripesize = md->md_stripesize;
529 sc->sc_stripebits = BITCOUNT(sc->sc_stripesize - 1);
530 sc->sc_ndisks = md->md_all;
531 sc->sc_disks = malloc(sizeof(struct g_consumer *) * sc->sc_ndisks,
532 M_STRIPE, M_WAITOK | M_ZERO);
533 for (no = 0; no < sc->sc_ndisks; no++)
534 sc->sc_disks[no] = NULL;
535 sc->sc_type = type;
536
537 gp->softc = sc;
538 sc->sc_geom = gp;
539 sc->sc_provider = NULL;
540
541 G_STRIPE_DEBUG(0, "Device %s created (id=%u).", gp->name, sc->sc_id);
542
543 return (gp);
544}
545
546static int
547g_stripe_destroy(struct g_stripe_softc *sc, boolean_t force)
548{
549 struct g_provider *pp;
550 struct g_geom *gp;
551 u_int no;
552
553 g_topology_assert();
554
555 if (sc == NULL)
556 return (ENXIO);
557
558 pp = sc->sc_provider;
559 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
560 if (force) {
561 G_STRIPE_DEBUG(0, "Device %s is still open, so it "
562 "can't be definitely removed.", pp->name);
563 } else {
564 G_STRIPE_DEBUG(1,
565 "Device %s is still open (r%dw%de%d).", pp->name,
566 pp->acr, pp->acw, pp->ace);
567 return (EBUSY);
568 }
569 }
570
571 for (no = 0; no < sc->sc_ndisks; no++) {
572 if (sc->sc_disks[no] != NULL)
573 g_stripe_remove_disk(sc->sc_disks[no]);
574 }
575
576 gp = sc->sc_geom;
577 gp->softc = NULL;
578 KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
579 gp->name));
580 free(sc->sc_disks, M_STRIPE);
581 free(sc, M_STRIPE);
582
583 pp = LIST_FIRST(&gp->provider);
584 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
585 G_STRIPE_DEBUG(0, "Device %s destroyed.", gp->name);
586
587 g_wither_geom(gp, ENXIO);
588
589 return (0);
590}
591
592static int
593g_stripe_destroy_geom(struct gctl_req *req __unused,
594 struct g_class *mp __unused, struct g_geom *gp)
595{
596 struct g_stripe_softc *sc;
597
598 sc = gp->softc;
599 return (g_stripe_destroy(sc, 0));
600}
601
602static struct g_geom *
603g_stripe_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
604{
605 struct g_stripe_metadata md;
606 struct g_stripe_softc *sc;
607 struct g_consumer *cp;
608 struct g_geom *gp;
609 int error;
610
611 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
612 g_topology_assert();
613
614 G_STRIPE_DEBUG(3, "Tasting %s.", pp->name);
615
616 gp = g_new_geomf(mp, "stripe:taste");
617 gp->start = g_stripe_start;
618 gp->access = g_stripe_access;
619 gp->orphan = g_stripe_orphan;
620 cp = g_new_consumer(gp);
621 g_attach(cp, pp);
622
623 error = g_stripe_read_metadata(cp, &md);
624 g_wither_geom(gp, ENXIO);
625 if (error != 0)
626 return (NULL);
627 gp = NULL;
628
629 if (strcmp(md.md_magic, G_STRIPE_MAGIC) != 0)
630 return (NULL);
631 if (md.md_version > G_STRIPE_VERSION) {
632 printf("geom_stripe.ko module is too old to handle %s.\n",
633 pp->name);
634 return (NULL);
635 }
636
637 /*
638 * Let's check if device already exists.
639 */
640 sc = NULL;
641 LIST_FOREACH(gp, &mp->geom, geom) {
642 sc = gp->softc;
643 if (sc == NULL)
644 continue;
645 if (sc->sc_type != G_STRIPE_TYPE_AUTOMATIC)
646 continue;
647 if (strcmp(md.md_name, sc->sc_name) != 0)
648 continue;
649 if (md.md_id != sc->sc_id)
650 continue;
651 break;
652 }
653 if (gp != NULL) {
654 G_STRIPE_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
655 error = g_stripe_add_disk(sc, pp, md.md_no);
656 if (error != 0) {
657 G_STRIPE_DEBUG(0,
658 "Cannot add disk %s to %s (error=%d).", pp->name,
659 gp->name, error);
660 return (NULL);
661 }
662 } else {
663 gp = g_stripe_create(mp, &md, G_STRIPE_TYPE_AUTOMATIC);
664 if (gp == NULL) {
665 G_STRIPE_DEBUG(0, "Cannot create device %s.stripe.",
666 md.md_name);
667 return (NULL);
668 }
669 sc = gp->softc;
670 G_STRIPE_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
671 error = g_stripe_add_disk(sc, pp, md.md_no);
672 if (error != 0) {
673 G_STRIPE_DEBUG(0,
674 "Cannot add disk %s to %s (error=%d).", pp->name,
675 gp->name, error);
676 g_stripe_destroy(sc, 1);
677 return (NULL);
678 }
679 }
680
681 return (gp);
682}
683
684static void
685g_stripe_ctl_create(struct gctl_req *req, struct g_class *mp)
686{
687 u_int attached, no;
688 struct g_stripe_metadata md;
689 struct g_provider *pp;
690 struct g_stripe_softc *sc;
691 struct g_geom *gp;
692 struct sbuf *sb;
693 intmax_t *stripesize;
694 const char *name;
695 char param[16];
696 int *nargs;
697
698 g_topology_assert();
699 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
700 if (nargs == NULL) {
701 gctl_error(req, "No '%s' argument.", "nargs");
702 return;
703 }
704 if (*nargs <= 2) {
705 gctl_error(req, "Too few arguments.");
706 return;
707 }
708
709 strlcpy(md.md_magic, G_STRIPE_MAGIC, sizeof(md.md_magic));
710 md.md_version = G_STRIPE_VERSION;
711 name = gctl_get_asciiparam(req, "arg0");
712 if (name == NULL) {
713 gctl_error(req, "No 'arg%u' argument.", 0);
714 return;
715 }
716 strlcpy(md.md_name, name, sizeof(md.md_name));
717 md.md_id = arc4random();
718 md.md_no = 0;
719 md.md_all = *nargs - 1;
720 stripesize = gctl_get_paraml(req, "stripesize", sizeof(*stripesize));
721 if (stripesize == NULL) {
722 gctl_error(req, "No '%s' argument.", "stripesize");
723 return;
724 }
725 md.md_stripesize = *stripesize;
726
727 /* Check all providers are valid */
728 for (no = 1; no < *nargs; no++) {
729 snprintf(param, sizeof(param), "arg%u", no);
730 name = gctl_get_asciiparam(req, param);
731 if (name == NULL) {
732 gctl_error(req, "No 'arg%u' argument.", no);
733 return;
734 }
735 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
736 name += strlen("/dev/");
737 pp = g_provider_by_name(name);
738 if (pp == NULL) {
739 G_STRIPE_DEBUG(1, "Disk %s is invalid.", name);
740 gctl_error(req, "Disk %s is invalid.", name);
741 return;
742 }
743 }
744
745 gp = g_stripe_create(mp, &md, G_STRIPE_TYPE_MANUAL);
746 if (gp == NULL) {
747 gctl_error(req, "Can't configure %s.stripe.", md.md_name);
748 return;
749 }
750
751 sc = gp->softc;
752 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
753 sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
754 for (attached = 0, no = 1; no < *nargs; no++) {
755 snprintf(param, sizeof(param), "arg%u", no);
756 name = gctl_get_asciiparam(req, param);
757 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
758 name += strlen("/dev/");
759 pp = g_provider_by_name(name);
760 KASSERT(pp != NULL, ("Provider %s disappear?!", name));
761 if (g_stripe_add_disk(sc, pp, no - 1) != 0) {
762 G_STRIPE_DEBUG(1, "Disk %u (%s) not attached to %s.",
763 no, pp->name, gp->name);
764 sbuf_printf(sb, " %s", pp->name);
765 continue;
766 }
767 attached++;
768 }
769 sbuf_finish(sb);
770 if (md.md_all != attached) {
771 g_stripe_destroy(gp->softc, 1);
772 gctl_error(req, "%s", sbuf_data(sb));
773 }
774 sbuf_delete(sb);
775}
776
777static struct g_stripe_softc *
778g_stripe_find_device(struct g_class *mp, const char *name)
779{
780 struct g_stripe_softc *sc;
781 struct g_geom *gp;
782
783 LIST_FOREACH(gp, &mp->geom, geom) {
784 sc = gp->softc;
785 if (sc == NULL)
786 continue;
787 if (strcmp(gp->name, name) == 0 ||
788 strcmp(sc->sc_name, name) == 0) {
789 return (sc);
790 }
791 }
792 return (NULL);
793}
794
795static void
796g_stripe_ctl_destroy(struct gctl_req *req, struct g_class *mp)
797{
798 struct g_stripe_softc *sc;
799 int *force, *nargs, error;
800 const char *name;
801 char param[16];
802 u_int i;
803
804 g_topology_assert();
805
806 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
807 if (nargs == NULL) {
808 gctl_error(req, "No '%s' argument.", "nargs");
809 return;
810 }
811 if (*nargs <= 0) {
812 gctl_error(req, "Missing device(s).");
813 return;
814 }
815 force = gctl_get_paraml(req, "force", sizeof(*force));
816 if (force == NULL) {
817 gctl_error(req, "No '%s' argument.", "force");
818 return;
819 }
820
821 for (i = 0; i < (u_int)*nargs; i++) {
822 snprintf(param, sizeof(param), "arg%u", i);
823 name = gctl_get_asciiparam(req, param);
824 if (name == NULL) {
825 gctl_error(req, "No 'arg%u' argument.", i);
826 return;
827 }
828 sc = g_stripe_find_device(mp, name);
829 if (sc == NULL) {
830 gctl_error(req, "No such device: %s.", name);
831 return;
832 }
833 error = g_stripe_destroy(sc, *force);
834 if (error != 0) {
835 gctl_error(req, "Cannot destroy device %s (error=%d).",
836 sc->sc_geom->name, error);
837 return;
838 }
839 }
840}
841
842static void
843g_stripe_config(struct gctl_req *req, struct g_class *mp, const char *verb)
844{
845 uint32_t *version;
846
847 g_topology_assert();
848
849 version = gctl_get_paraml(req, "version", sizeof(*version));
850 if (version == NULL) {
851 gctl_error(req, "No '%s' argument.", "version");
852 return;
853 }
854 if (*version != G_STRIPE_VERSION) {
855 gctl_error(req, "Userland and kernel parts are out of sync.");
856 return;
857 }
858
859 if (strcmp(verb, "create") == 0) {
860 g_stripe_ctl_create(req, mp);
861 return;
| 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/stripe/g_stripe.h>
41
42
43static MALLOC_DEFINE(M_STRIPE, "stripe data", "GEOM_STRIPE Data");
44
45SYSCTL_DECL(_kern_geom);
46SYSCTL_NODE(_kern_geom, OID_AUTO, stripe, CTLFLAG_RW, 0, "GEOM_STRIPE stuff");
47static u_int g_stripe_debug = 0;
48SYSCTL_UINT(_kern_geom_stripe, OID_AUTO, debug, CTLFLAG_RW, &g_stripe_debug, 0,
49 "Debug level");
50
51static int g_stripe_destroy(struct g_stripe_softc *sc, boolean_t force);
52static int g_stripe_destroy_geom(struct gctl_req *req, struct g_class *mp,
53 struct g_geom *gp);
54
55static g_taste_t g_stripe_taste;
56static g_ctl_req_t g_stripe_config;
57static g_dumpconf_t g_stripe_dumpconf;
58
59struct g_class g_stripe_class = {
60 .name = G_STRIPE_CLASS_NAME,
61 .ctlreq = g_stripe_config,
62 .taste = g_stripe_taste,
63 .destroy_geom = g_stripe_destroy_geom
64};
65
66
67/*
68 * Greatest Common Divisor.
69 */
70static u_int
71gcd(u_int a, u_int b)
72{
73 u_int c;
74
75 while (b != 0) {
76 c = a;
77 a = b;
78 b = (c % b);
79 }
80 return (a);
81}
82
83/*
84 * Least Common Multiple.
85 */
86static u_int
87lcm(u_int a, u_int b)
88{
89
90 return ((a * b) / gcd(a, b));
91}
92
93/*
94 * Return the number of valid disks.
95 */
96static u_int
97g_stripe_nvalid(struct g_stripe_softc *sc)
98{
99 u_int i, no;
100
101 no = 0;
102 for (i = 0; i < sc->sc_ndisks; i++) {
103 if (sc->sc_disks[i] != NULL)
104 no++;
105 }
106
107 return (no);
108}
109
110static void
111g_stripe_remove_disk(struct g_consumer *cp)
112{
113 struct g_stripe_softc *sc;
114 u_int no;
115
116 KASSERT(cp != NULL, ("Non-valid disk in %s.", __func__));
117 sc = (struct g_stripe_softc *)cp->private;
118 KASSERT(sc != NULL, ("NULL sc in %s.", __func__));
119 no = cp->index;
120
121 G_STRIPE_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
122 sc->sc_geom->name);
123
124 sc->sc_disks[no] = NULL;
125 if (sc->sc_provider != NULL) {
126 g_orphan_provider(sc->sc_provider, ENXIO);
127 sc->sc_provider = NULL;
128 G_STRIPE_DEBUG(0, "Device %s removed.", sc->sc_geom->name);
129 }
130
131 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
132 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
133 g_detach(cp);
134 g_destroy_consumer(cp);
135}
136
137static void
138g_stripe_orphan(struct g_consumer *cp)
139{
140 struct g_stripe_softc *sc;
141 struct g_geom *gp;
142
143 g_topology_assert();
144 gp = cp->geom;
145 sc = gp->softc;
146 if (sc == NULL)
147 return;
148
149 g_stripe_remove_disk(cp);
150 /* If there are no valid disks anymore, remove device. */
151 if (g_stripe_nvalid(sc) == 0)
152 g_stripe_destroy(sc, 1);
153}
154
155static int
156g_stripe_access(struct g_provider *pp, int dr, int dw, int de)
157{
158 struct g_consumer *cp1, *cp2;
159 struct g_stripe_softc *sc;
160 struct g_geom *gp;
161 int error;
162
163 gp = pp->geom;
164 sc = gp->softc;
165
166 if (sc == NULL) {
167 /*
168 * It looks like geom is being withered.
169 * In that case we allow only negative requests.
170 */
171 KASSERT(dr <= 0 && dw <= 0 && de <= 0,
172 ("Positive access request (device=%s).", pp->name));
173 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 &&
174 (pp->ace + de) == 0) {
175 G_STRIPE_DEBUG(0, "Device %s definitely destroyed.",
176 gp->name);
177 }
178 return (0);
179 }
180
181 /* On first open, grab an extra "exclusive" bit */
182 if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
183 de++;
184 /* ... and let go of it on last close */
185 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
186 de--;
187
188 error = ENXIO;
189 LIST_FOREACH(cp1, &gp->consumer, consumer) {
190 error = g_access(cp1, dr, dw, de);
191 if (error == 0)
192 continue;
193 /*
194 * If we fail here, backout all previous changes.
195 */
196 LIST_FOREACH(cp2, &gp->consumer, consumer) {
197 if (cp1 == cp2)
198 return (error);
199 g_access(cp2, -dr, -dw, -de);
200 }
201 /* NOTREACHED */
202 }
203
204 return (error);
205}
206
207static void
208g_stripe_start(struct bio *bp)
209{
210 struct g_provider *pp;
211 struct g_stripe_softc *sc;
212 off_t off, start, length, nstripe;
213 struct bio *cbp;
214 u_int sectorsize;
215 uint32_t stripesize;
216 uint16_t no;
217 char *addr;
218
219 pp = bp->bio_to;
220 sc = pp->geom->softc;
221 /*
222 * If sc == NULL, provider's error should be set and g_stripe_start()
223 * should not be called at all.
224 */
225 KASSERT(sc != NULL,
226 ("Provider's error should be set (error=%d)(device=%s).",
227 bp->bio_to->error, bp->bio_to->name));
228
229 G_STRIPE_LOGREQ(bp, "Request received.");
230
231 switch (bp->bio_cmd) {
232 case BIO_READ:
233 case BIO_WRITE:
234 case BIO_DELETE:
235 /*
236 * Only those requests are supported.
237 */
238 break;
239 case BIO_GETATTR:
240 /* To which provider it should be delivered? */
241 default:
242 g_io_deliver(bp, EOPNOTSUPP);
243 return;
244 }
245
246 addr = bp->bio_data;
247 sectorsize = sc->sc_provider->sectorsize;
248 stripesize = sc->sc_stripesize;
249
250 /*
251 * Calcucations are quite messy, but fast I hope.
252 */
253
254 /* Stripe number. */
255 /* nstripe = bp->bio_offset / stripesize; */
256 nstripe = bp->bio_offset >> (off_t)sc->sc_stripebits;
257 /* Disk number. */
258 no = nstripe % sc->sc_ndisks;
259 /* Start position in stripe. */
260 /* start = bp->bio_offset % stripesize; */
261 start = bp->bio_offset & (stripesize - 1);
262 /* Start position in disk. */
263 /* off = (nstripe / sc->sc_ndisks) * stripesize + start; */
264 off = ((nstripe / sc->sc_ndisks) << sc->sc_stripebits) + start;
265 /* Length of data to operate. */
266 length = MIN(bp->bio_length, stripesize - start);
267
268 cbp = g_clone_bio(bp);
269 if (cbp == NULL) {
270 /*
271 * Deny all request. This is pointless
272 * to split rest of the request, bacause
273 * we're setting bio_error here, so all
274 * request will be denied, anyway.
275 */
276 bp->bio_completed = bp->bio_length;
277 if (bp->bio_error == 0)
278 bp->bio_error = ENOMEM;
279 g_io_deliver(bp, bp->bio_error);
280 return;
281 }
282 /*
283 * Fill in the component buf structure.
284 */
285 cbp->bio_done = g_std_done;
286 cbp->bio_offset = off;
287 cbp->bio_data = addr;
288 cbp->bio_length = length;
289 cbp->bio_to = sc->sc_disks[no]->provider;
290 G_STRIPE_LOGREQ(cbp, "Sending request.");
291 g_io_request(cbp, sc->sc_disks[no]);
292
293 /* off -= off % stripesize; */
294 off -= off & (stripesize - 1);
295 addr += length;
296 length = bp->bio_length - length;
297 for (no++; length > 0; no++, length -= stripesize, addr += stripesize) {
298 if (no > sc->sc_ndisks - 1) {
299 no = 0;
300 off += stripesize;
301 }
302 cbp = g_clone_bio(bp);
303 if (cbp == NULL) {
304 /*
305 * Deny remaining part. This is pointless
306 * to split rest of the request, bacause
307 * we're setting bio_error here, so all
308 * request will be denied, anyway.
309 */
310 bp->bio_completed += length;
311 if (bp->bio_error == 0)
312 bp->bio_error = ENOMEM;
313 if (bp->bio_completed == bp->bio_length)
314 g_io_deliver(bp, bp->bio_error);
315 return;
316 }
317
318 /*
319 * Fill in the component buf structure.
320 */
321 cbp->bio_done = g_std_done;
322 cbp->bio_offset = off;
323 cbp->bio_data = addr;
324 /*
325 * MIN() is in case when
326 * (bp->bio_length % sc->sc_stripesize) != 0.
327 */
328 cbp->bio_length = MIN(stripesize, length);
329
330 cbp->bio_to = sc->sc_disks[no]->provider;
331 G_STRIPE_LOGREQ(cbp, "Sending request.");
332 g_io_request(cbp, sc->sc_disks[no]);
333 }
334}
335
336static void
337g_stripe_check_and_run(struct g_stripe_softc *sc)
338{
339 off_t mediasize, ms;
340 u_int no, sectorsize = 0;
341
342 if (g_stripe_nvalid(sc) != sc->sc_ndisks)
343 return;
344
345 sc->sc_provider = g_new_providerf(sc->sc_geom, "%s", sc->sc_geom->name);
346 /*
347 * Find the smallest disk.
348 */
349 mediasize = sc->sc_disks[0]->provider->mediasize;
350 if (sc->sc_type == G_STRIPE_TYPE_AUTOMATIC)
351 mediasize -= sc->sc_disks[0]->provider->sectorsize;
352 mediasize -= mediasize % sc->sc_stripesize;
353 sectorsize = sc->sc_disks[0]->provider->sectorsize;
354 for (no = 1; no < sc->sc_ndisks; no++) {
355 ms = sc->sc_disks[no]->provider->mediasize;
356 if (sc->sc_type == G_STRIPE_TYPE_AUTOMATIC)
357 ms -= sc->sc_disks[no]->provider->sectorsize;
358 ms -= ms % sc->sc_stripesize;
359 if (ms < mediasize)
360 mediasize = ms;
361 sectorsize = lcm(sectorsize,
362 sc->sc_disks[no]->provider->sectorsize);
363 }
364 sc->sc_provider->sectorsize = sectorsize;
365 sc->sc_provider->mediasize = mediasize * sc->sc_ndisks;
366 g_error_provider(sc->sc_provider, 0);
367
368 G_STRIPE_DEBUG(0, "Device %s activated.", sc->sc_geom->name);
369}
370
371static int
372g_stripe_read_metadata(struct g_consumer *cp, struct g_stripe_metadata *md)
373{
374 struct g_provider *pp;
375 u_char *buf;
376 int error;
377
378 g_topology_assert();
379
380 error = g_access(cp, 1, 0, 0);
381 if (error != 0)
382 return (error);
383 pp = cp->provider;
384 g_topology_unlock();
385 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
386 &error);
387 g_topology_lock();
388 g_access(cp, -1, 0, 0);
389 if (buf == NULL)
390 return (error);
391
392 /* Decode metadata. */
393 stripe_metadata_decode(buf, md);
394 g_free(buf);
395
396 return (0);
397}
398
399/*
400 * Add disk to given device.
401 */
402static int
403g_stripe_add_disk(struct g_stripe_softc *sc, struct g_provider *pp, u_int no)
404{
405 struct g_consumer *cp, *fcp;
406 struct g_geom *gp;
407 int error;
408
409 /* Metadata corrupted? */
410 if (no >= sc->sc_ndisks)
411 return (EINVAL);
412
413 /* Check if disk is not already attached. */
414 if (sc->sc_disks[no] != NULL)
415 return (EEXIST);
416
417 gp = sc->sc_geom;
418 fcp = LIST_FIRST(&gp->consumer);
419
420 cp = g_new_consumer(gp);
421 error = g_attach(cp, pp);
422 if (error != 0) {
423 g_destroy_consumer(cp);
424 return (error);
425 }
426
427 if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
428 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
429 if (error != 0) {
430 g_detach(cp);
431 g_destroy_consumer(cp);
432 return (error);
433 }
434 }
435 if (sc->sc_type == G_STRIPE_TYPE_AUTOMATIC) {
436 struct g_stripe_metadata md;
437
438 /* Reread metadata. */
439 error = g_stripe_read_metadata(cp, &md);
440 if (error != 0)
441 goto fail;
442
443 if (strcmp(md.md_magic, G_STRIPE_MAGIC) != 0 ||
444 strcmp(md.md_name, sc->sc_name) != 0 ||
445 md.md_id != sc->sc_id) {
446 G_STRIPE_DEBUG(0, "Metadata on %s changed.", pp->name);
447 goto fail;
448 }
449 }
450
451 cp->private = sc;
452 cp->index = no;
453 sc->sc_disks[no] = cp;
454
455 G_STRIPE_DEBUG(0, "Disk %s attached to %s.", pp->name, gp->name);
456
457 g_stripe_check_and_run(sc);
458
459 return (0);
460fail:
461 if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
462 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
463 g_detach(cp);
464 g_destroy_consumer(cp);
465 return (error);
466}
467
468static struct g_geom *
469g_stripe_create(struct g_class *mp, const struct g_stripe_metadata *md,
470 u_int type)
471{
472 struct g_stripe_softc *sc;
473 struct g_geom *gp;
474 u_int no;
475
476 G_STRIPE_DEBUG(1, "Creating device %s.stripe (id=%u).", md->md_name,
477 md->md_id);
478
479 /* Two disks is minimum. */
480 if (md->md_all <= 1) {
481 G_STRIPE_DEBUG(0, "Too few disks defined for %s.stripe.",
482 md->md_name);
483 return (NULL);
484 }
485#if 0
486 /* Stripe size have to be grater than or equal to sector size. */
487 if (md->md_stripesize < sectorsize) {
488 G_STRIPE_DEBUG(0, "Invalid stripe size for %s.stripe.",
489 md->md_name);
490 return (NULL);
491 }
492#endif
493 /* Stripe size have to be power of 2. */
494 if (!powerof2(md->md_stripesize)) {
495 G_STRIPE_DEBUG(0, "Invalid stripe size for %s.stripe.",
496 md->md_name);
497 return (NULL);
498 }
499
500 /* Check for duplicate unit */
501 LIST_FOREACH(gp, &mp->geom, geom) {
502 sc = gp->softc;
503 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
504 G_STRIPE_DEBUG(0, "Device %s already configured.",
505 gp->name);
506 return (NULL);
507 }
508 }
509 gp = g_new_geomf(mp, "%s.stripe", md->md_name);
510 gp->softc = NULL; /* for a moment */
511
512 sc = malloc(sizeof(*sc), M_STRIPE, M_NOWAIT | M_ZERO);
513 if (sc == NULL) {
514 G_STRIPE_DEBUG(0, "Can't allocate memory for device %s.",
515 gp->name);
516 g_destroy_geom(gp);
517 return (NULL);
518 }
519
520 gp->start = g_stripe_start;
521 gp->spoiled = g_stripe_orphan;
522 gp->orphan = g_stripe_orphan;
523 gp->access = g_stripe_access;
524 gp->dumpconf = g_stripe_dumpconf;
525
526 strlcpy(sc->sc_name, md->md_name, sizeof(sc->sc_name));
527 sc->sc_id = md->md_id;
528 sc->sc_stripesize = md->md_stripesize;
529 sc->sc_stripebits = BITCOUNT(sc->sc_stripesize - 1);
530 sc->sc_ndisks = md->md_all;
531 sc->sc_disks = malloc(sizeof(struct g_consumer *) * sc->sc_ndisks,
532 M_STRIPE, M_WAITOK | M_ZERO);
533 for (no = 0; no < sc->sc_ndisks; no++)
534 sc->sc_disks[no] = NULL;
535 sc->sc_type = type;
536
537 gp->softc = sc;
538 sc->sc_geom = gp;
539 sc->sc_provider = NULL;
540
541 G_STRIPE_DEBUG(0, "Device %s created (id=%u).", gp->name, sc->sc_id);
542
543 return (gp);
544}
545
546static int
547g_stripe_destroy(struct g_stripe_softc *sc, boolean_t force)
548{
549 struct g_provider *pp;
550 struct g_geom *gp;
551 u_int no;
552
553 g_topology_assert();
554
555 if (sc == NULL)
556 return (ENXIO);
557
558 pp = sc->sc_provider;
559 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
560 if (force) {
561 G_STRIPE_DEBUG(0, "Device %s is still open, so it "
562 "can't be definitely removed.", pp->name);
563 } else {
564 G_STRIPE_DEBUG(1,
565 "Device %s is still open (r%dw%de%d).", pp->name,
566 pp->acr, pp->acw, pp->ace);
567 return (EBUSY);
568 }
569 }
570
571 for (no = 0; no < sc->sc_ndisks; no++) {
572 if (sc->sc_disks[no] != NULL)
573 g_stripe_remove_disk(sc->sc_disks[no]);
574 }
575
576 gp = sc->sc_geom;
577 gp->softc = NULL;
578 KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
579 gp->name));
580 free(sc->sc_disks, M_STRIPE);
581 free(sc, M_STRIPE);
582
583 pp = LIST_FIRST(&gp->provider);
584 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
585 G_STRIPE_DEBUG(0, "Device %s destroyed.", gp->name);
586
587 g_wither_geom(gp, ENXIO);
588
589 return (0);
590}
591
592static int
593g_stripe_destroy_geom(struct gctl_req *req __unused,
594 struct g_class *mp __unused, struct g_geom *gp)
595{
596 struct g_stripe_softc *sc;
597
598 sc = gp->softc;
599 return (g_stripe_destroy(sc, 0));
600}
601
602static struct g_geom *
603g_stripe_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
604{
605 struct g_stripe_metadata md;
606 struct g_stripe_softc *sc;
607 struct g_consumer *cp;
608 struct g_geom *gp;
609 int error;
610
611 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
612 g_topology_assert();
613
614 G_STRIPE_DEBUG(3, "Tasting %s.", pp->name);
615
616 gp = g_new_geomf(mp, "stripe:taste");
617 gp->start = g_stripe_start;
618 gp->access = g_stripe_access;
619 gp->orphan = g_stripe_orphan;
620 cp = g_new_consumer(gp);
621 g_attach(cp, pp);
622
623 error = g_stripe_read_metadata(cp, &md);
624 g_wither_geom(gp, ENXIO);
625 if (error != 0)
626 return (NULL);
627 gp = NULL;
628
629 if (strcmp(md.md_magic, G_STRIPE_MAGIC) != 0)
630 return (NULL);
631 if (md.md_version > G_STRIPE_VERSION) {
632 printf("geom_stripe.ko module is too old to handle %s.\n",
633 pp->name);
634 return (NULL);
635 }
636
637 /*
638 * Let's check if device already exists.
639 */
640 sc = NULL;
641 LIST_FOREACH(gp, &mp->geom, geom) {
642 sc = gp->softc;
643 if (sc == NULL)
644 continue;
645 if (sc->sc_type != G_STRIPE_TYPE_AUTOMATIC)
646 continue;
647 if (strcmp(md.md_name, sc->sc_name) != 0)
648 continue;
649 if (md.md_id != sc->sc_id)
650 continue;
651 break;
652 }
653 if (gp != NULL) {
654 G_STRIPE_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
655 error = g_stripe_add_disk(sc, pp, md.md_no);
656 if (error != 0) {
657 G_STRIPE_DEBUG(0,
658 "Cannot add disk %s to %s (error=%d).", pp->name,
659 gp->name, error);
660 return (NULL);
661 }
662 } else {
663 gp = g_stripe_create(mp, &md, G_STRIPE_TYPE_AUTOMATIC);
664 if (gp == NULL) {
665 G_STRIPE_DEBUG(0, "Cannot create device %s.stripe.",
666 md.md_name);
667 return (NULL);
668 }
669 sc = gp->softc;
670 G_STRIPE_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
671 error = g_stripe_add_disk(sc, pp, md.md_no);
672 if (error != 0) {
673 G_STRIPE_DEBUG(0,
674 "Cannot add disk %s to %s (error=%d).", pp->name,
675 gp->name, error);
676 g_stripe_destroy(sc, 1);
677 return (NULL);
678 }
679 }
680
681 return (gp);
682}
683
684static void
685g_stripe_ctl_create(struct gctl_req *req, struct g_class *mp)
686{
687 u_int attached, no;
688 struct g_stripe_metadata md;
689 struct g_provider *pp;
690 struct g_stripe_softc *sc;
691 struct g_geom *gp;
692 struct sbuf *sb;
693 intmax_t *stripesize;
694 const char *name;
695 char param[16];
696 int *nargs;
697
698 g_topology_assert();
699 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
700 if (nargs == NULL) {
701 gctl_error(req, "No '%s' argument.", "nargs");
702 return;
703 }
704 if (*nargs <= 2) {
705 gctl_error(req, "Too few arguments.");
706 return;
707 }
708
709 strlcpy(md.md_magic, G_STRIPE_MAGIC, sizeof(md.md_magic));
710 md.md_version = G_STRIPE_VERSION;
711 name = gctl_get_asciiparam(req, "arg0");
712 if (name == NULL) {
713 gctl_error(req, "No 'arg%u' argument.", 0);
714 return;
715 }
716 strlcpy(md.md_name, name, sizeof(md.md_name));
717 md.md_id = arc4random();
718 md.md_no = 0;
719 md.md_all = *nargs - 1;
720 stripesize = gctl_get_paraml(req, "stripesize", sizeof(*stripesize));
721 if (stripesize == NULL) {
722 gctl_error(req, "No '%s' argument.", "stripesize");
723 return;
724 }
725 md.md_stripesize = *stripesize;
726
727 /* Check all providers are valid */
728 for (no = 1; no < *nargs; no++) {
729 snprintf(param, sizeof(param), "arg%u", no);
730 name = gctl_get_asciiparam(req, param);
731 if (name == NULL) {
732 gctl_error(req, "No 'arg%u' argument.", no);
733 return;
734 }
735 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
736 name += strlen("/dev/");
737 pp = g_provider_by_name(name);
738 if (pp == NULL) {
739 G_STRIPE_DEBUG(1, "Disk %s is invalid.", name);
740 gctl_error(req, "Disk %s is invalid.", name);
741 return;
742 }
743 }
744
745 gp = g_stripe_create(mp, &md, G_STRIPE_TYPE_MANUAL);
746 if (gp == NULL) {
747 gctl_error(req, "Can't configure %s.stripe.", md.md_name);
748 return;
749 }
750
751 sc = gp->softc;
752 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
753 sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
754 for (attached = 0, no = 1; no < *nargs; no++) {
755 snprintf(param, sizeof(param), "arg%u", no);
756 name = gctl_get_asciiparam(req, param);
757 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
758 name += strlen("/dev/");
759 pp = g_provider_by_name(name);
760 KASSERT(pp != NULL, ("Provider %s disappear?!", name));
761 if (g_stripe_add_disk(sc, pp, no - 1) != 0) {
762 G_STRIPE_DEBUG(1, "Disk %u (%s) not attached to %s.",
763 no, pp->name, gp->name);
764 sbuf_printf(sb, " %s", pp->name);
765 continue;
766 }
767 attached++;
768 }
769 sbuf_finish(sb);
770 if (md.md_all != attached) {
771 g_stripe_destroy(gp->softc, 1);
772 gctl_error(req, "%s", sbuf_data(sb));
773 }
774 sbuf_delete(sb);
775}
776
777static struct g_stripe_softc *
778g_stripe_find_device(struct g_class *mp, const char *name)
779{
780 struct g_stripe_softc *sc;
781 struct g_geom *gp;
782
783 LIST_FOREACH(gp, &mp->geom, geom) {
784 sc = gp->softc;
785 if (sc == NULL)
786 continue;
787 if (strcmp(gp->name, name) == 0 ||
788 strcmp(sc->sc_name, name) == 0) {
789 return (sc);
790 }
791 }
792 return (NULL);
793}
794
795static void
796g_stripe_ctl_destroy(struct gctl_req *req, struct g_class *mp)
797{
798 struct g_stripe_softc *sc;
799 int *force, *nargs, error;
800 const char *name;
801 char param[16];
802 u_int i;
803
804 g_topology_assert();
805
806 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
807 if (nargs == NULL) {
808 gctl_error(req, "No '%s' argument.", "nargs");
809 return;
810 }
811 if (*nargs <= 0) {
812 gctl_error(req, "Missing device(s).");
813 return;
814 }
815 force = gctl_get_paraml(req, "force", sizeof(*force));
816 if (force == NULL) {
817 gctl_error(req, "No '%s' argument.", "force");
818 return;
819 }
820
821 for (i = 0; i < (u_int)*nargs; i++) {
822 snprintf(param, sizeof(param), "arg%u", i);
823 name = gctl_get_asciiparam(req, param);
824 if (name == NULL) {
825 gctl_error(req, "No 'arg%u' argument.", i);
826 return;
827 }
828 sc = g_stripe_find_device(mp, name);
829 if (sc == NULL) {
830 gctl_error(req, "No such device: %s.", name);
831 return;
832 }
833 error = g_stripe_destroy(sc, *force);
834 if (error != 0) {
835 gctl_error(req, "Cannot destroy device %s (error=%d).",
836 sc->sc_geom->name, error);
837 return;
838 }
839 }
840}
841
842static void
843g_stripe_config(struct gctl_req *req, struct g_class *mp, const char *verb)
844{
845 uint32_t *version;
846
847 g_topology_assert();
848
849 version = gctl_get_paraml(req, "version", sizeof(*version));
850 if (version == NULL) {
851 gctl_error(req, "No '%s' argument.", "version");
852 return;
853 }
854 if (*version != G_STRIPE_VERSION) {
855 gctl_error(req, "Userland and kernel parts are out of sync.");
856 return;
857 }
858
859 if (strcmp(verb, "create") == 0) {
860 g_stripe_ctl_create(req, mp);
861 return;
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