FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_bsd.c
1 /*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 * products derived from this software without specific prior written
21 * permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 /*
37 * This is the method for dealing with BSD disklabels. It has been
38 * extensively (by my standards at least) commented, in the vain hope that
39 * it will serve as the source in future copy&paste operations.
40 */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD: releng/8.2/sys/geom/geom_bsd.c 199583 2009-11-20 15:27:52Z jhb $");
44
45 #include <sys/param.h>
46 #include <sys/endian.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/fcntl.h>
50 #include <sys/conf.h>
51 #include <sys/bio.h>
52 #include <sys/malloc.h>
53 #include <sys/lock.h>
54 #include <sys/mutex.h>
55 #include <sys/md5.h>
56 #include <sys/errno.h>
57 #include <sys/disklabel.h>
58 #include <sys/gpt.h>
59 #include <sys/uuid.h>
60 #include <geom/geom.h>
61 #include <geom/geom_slice.h>
62
63 #define BSD_CLASS_NAME "BSD"
64
65 #define ALPHA_LABEL_OFFSET 64
66 #define HISTORIC_LABEL_OFFSET 512
67
68 #define LABELSIZE (148 + 16 * MAXPARTITIONS)
69
70 static void g_bsd_hotwrite(void *arg, int flag);
71 /*
72 * Our private data about one instance. All the rest is handled by the
73 * slice code and stored in its softc, so this is just the stuff
74 * specific to BSD disklabels.
75 */
76 struct g_bsd_softc {
77 off_t labeloffset;
78 off_t mbroffset;
79 off_t rawoffset;
80 struct disklabel ondisk;
81 u_char label[LABELSIZE];
82 u_char labelsum[16];
83 };
84
85 /*
86 * Modify our slicer to match proposed disklabel, if possible.
87 * This is where we make sure we don't do something stupid.
88 */
89 static int
90 g_bsd_modify(struct g_geom *gp, u_char *label)
91 {
92 int i, error;
93 struct partition *ppp;
94 struct g_slicer *gsp;
95 struct g_consumer *cp;
96 struct g_bsd_softc *ms;
97 u_int secsize, u;
98 off_t rawoffset, o;
99 struct disklabel dl;
100 MD5_CTX md5sum;
101
102 g_topology_assert();
103 gsp = gp->softc;
104 ms = gsp->softc;
105
106 error = bsd_disklabel_le_dec(label, &dl, MAXPARTITIONS);
107 if (error) {
108 return (error);
109 }
110
111 /* Get dimensions of our device. */
112 cp = LIST_FIRST(&gp->consumer);
113 secsize = cp->provider->sectorsize;
114
115 /* ... or a smaller sector size. */
116 if (dl.d_secsize < secsize) {
117 return (EINVAL);
118 }
119
120 /* ... or a non-multiple sector size. */
121 if (dl.d_secsize % secsize != 0) {
122 return (EINVAL);
123 }
124
125 /* Historical braindamage... */
126 rawoffset = (off_t)dl.d_partitions[RAW_PART].p_offset * dl.d_secsize;
127
128 for (i = 0; i < dl.d_npartitions; i++) {
129 ppp = &dl.d_partitions[i];
130 if (ppp->p_size == 0)
131 continue;
132 o = (off_t)ppp->p_offset * dl.d_secsize;
133
134 if (o < rawoffset)
135 rawoffset = 0;
136 }
137
138 if (rawoffset != 0 && (off_t)rawoffset != ms->mbroffset)
139 printf("WARNING: %s expected rawoffset %jd, found %jd\n",
140 gp->name,
141 (intmax_t)ms->mbroffset/dl.d_secsize,
142 (intmax_t)rawoffset/dl.d_secsize);
143
144 /* Don't munge open partitions. */
145 for (i = 0; i < dl.d_npartitions; i++) {
146 ppp = &dl.d_partitions[i];
147
148 o = (off_t)ppp->p_offset * dl.d_secsize;
149 if (o == 0)
150 o = rawoffset;
151 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
152 o - rawoffset,
153 (off_t)ppp->p_size * dl.d_secsize,
154 dl.d_secsize,
155 "%s%c", gp->name, 'a' + i);
156 if (error)
157 return (error);
158 }
159
160 /* Look good, go for it... */
161 for (u = 0; u < gsp->nslice; u++) {
162 ppp = &dl.d_partitions[u];
163 o = (off_t)ppp->p_offset * dl.d_secsize;
164 if (o == 0)
165 o = rawoffset;
166 g_slice_config(gp, u, G_SLICE_CONFIG_SET,
167 o - rawoffset,
168 (off_t)ppp->p_size * dl.d_secsize,
169 dl.d_secsize,
170 "%s%c", gp->name, 'a' + u);
171 }
172
173 /* Update our softc */
174 ms->ondisk = dl;
175 if (label != ms->label)
176 bcopy(label, ms->label, LABELSIZE);
177 ms->rawoffset = rawoffset;
178
179 /*
180 * In order to avoid recursively attaching to the same
181 * on-disk label (it's usually visible through the 'c'
182 * partition) we calculate an MD5 and ask if other BSD's
183 * below us love that label. If they do, we don't.
184 */
185 MD5Init(&md5sum);
186 MD5Update(&md5sum, ms->label, sizeof(ms->label));
187 MD5Final(ms->labelsum, &md5sum);
188
189 return (0);
190 }
191
192 /*
193 * This is an internal helper function, called multiple times from the taste
194 * function to try to locate a disklabel on the disk. More civilized formats
195 * will not need this, as there is only one possible place on disk to look
196 * for the magic spot.
197 */
198
199 static int
200 g_bsd_try(struct g_geom *gp, struct g_slicer *gsp, struct g_consumer *cp, int secsize, struct g_bsd_softc *ms, off_t offset)
201 {
202 int error;
203 u_char *buf;
204 struct disklabel *dl;
205 off_t secoff;
206
207 /*
208 * We need to read entire aligned sectors, and we assume that the
209 * disklabel does not span sectors, so one sector is enough.
210 */
211 secoff = offset % secsize;
212 buf = g_read_data(cp, offset - secoff, secsize, NULL);
213 if (buf == NULL)
214 return (ENOENT);
215
216 /* Decode into our native format. */
217 dl = &ms->ondisk;
218 error = bsd_disklabel_le_dec(buf + secoff, dl, MAXPARTITIONS);
219 if (!error)
220 bcopy(buf + secoff, ms->label, LABELSIZE);
221
222 /* Remember to free the buffer g_read_data() gave us. */
223 g_free(buf);
224
225 ms->labeloffset = offset;
226 return (error);
227 }
228
229 /*
230 * This function writes the current label to disk, possibly updating
231 * the alpha SRM checksum.
232 */
233
234 static int
235 g_bsd_writelabel(struct g_geom *gp, u_char *bootcode)
236 {
237 off_t secoff;
238 u_int secsize;
239 struct g_consumer *cp;
240 struct g_slicer *gsp;
241 struct g_bsd_softc *ms;
242 u_char *buf;
243 uint64_t sum;
244 int error, i;
245
246 gsp = gp->softc;
247 ms = gsp->softc;
248 cp = LIST_FIRST(&gp->consumer);
249 /* Get sector size, we need it to read data. */
250 secsize = cp->provider->sectorsize;
251 secoff = ms->labeloffset % secsize;
252 if (bootcode == NULL) {
253 buf = g_read_data(cp, ms->labeloffset - secoff, secsize, &error);
254 if (buf == NULL)
255 return (error);
256 bcopy(ms->label, buf + secoff, sizeof(ms->label));
257 } else {
258 buf = bootcode;
259 bcopy(ms->label, buf + ms->labeloffset, sizeof(ms->label));
260 }
261 if (ms->labeloffset == ALPHA_LABEL_OFFSET) {
262 sum = 0;
263 for (i = 0; i < 63; i++)
264 sum += le64dec(buf + i * 8);
265 le64enc(buf + 504, sum);
266 }
267 if (bootcode == NULL) {
268 error = g_write_data(cp, ms->labeloffset - secoff, buf, secsize);
269 g_free(buf);
270 } else {
271 error = g_write_data(cp, 0, bootcode, BBSIZE);
272 }
273 return(error);
274 }
275
276 /*
277 * If the user tries to overwrite our disklabel through an open partition
278 * or via a magicwrite config call, we end up here and try to prevent
279 * footshooting as best we can.
280 */
281 static void
282 g_bsd_hotwrite(void *arg, int flag)
283 {
284 struct bio *bp;
285 struct g_geom *gp;
286 struct g_slicer *gsp;
287 struct g_slice *gsl;
288 struct g_bsd_softc *ms;
289 u_char *p;
290 int error;
291
292 g_topology_assert();
293 /*
294 * We should never get canceled, because that would amount to a removal
295 * of the geom while there was outstanding I/O requests.
296 */
297 KASSERT(flag != EV_CANCEL, ("g_bsd_hotwrite cancelled"));
298 bp = arg;
299 gp = bp->bio_to->geom;
300 gsp = gp->softc;
301 ms = gsp->softc;
302 gsl = &gsp->slices[bp->bio_to->index];
303 p = (u_char*)bp->bio_data + ms->labeloffset
304 - (bp->bio_offset + gsl->offset);
305 error = g_bsd_modify(gp, p);
306 if (error) {
307 g_io_deliver(bp, EPERM);
308 return;
309 }
310 g_slice_finish_hot(bp);
311 }
312
313 /*-
314 * This start routine is only called for non-trivial requests, all the
315 * trivial ones are handled autonomously by the slice code.
316 * For requests we handle here, we must call the g_io_deliver() on the
317 * bio, and return non-zero to indicate to the slice code that we did so.
318 * This code executes in the "DOWN" I/O path, this means:
319 * * No sleeping.
320 * * Don't grab the topology lock.
321 * * Don't call biowait, g_getattr(), g_setattr() or g_read_data()
322 */
323 static int
324 g_bsd_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
325 {
326 struct g_geom *gp;
327 struct g_bsd_softc *ms;
328 struct g_slicer *gsp;
329 u_char *label;
330 int error;
331
332 gp = pp->geom;
333 gsp = gp->softc;
334 ms = gsp->softc;
335
336 switch(cmd) {
337 case DIOCGDINFO:
338 /* Return a copy of the disklabel to userland. */
339 bsd_disklabel_le_dec(ms->label, data, MAXPARTITIONS);
340 return(0);
341 case DIOCBSDBB: {
342 struct g_consumer *cp;
343 u_char *buf;
344 void *p;
345 int error, i;
346 uint64_t sum;
347
348 if (!(fflag & FWRITE))
349 return (EPERM);
350 /* The disklabel to set is the ioctl argument. */
351 buf = g_malloc(BBSIZE, M_WAITOK);
352 p = *(void **)data;
353 error = copyin(p, buf, BBSIZE);
354 if (!error) {
355 /* XXX: Rude, but supposedly safe */
356 DROP_GIANT();
357 g_topology_lock();
358 /* Validate and modify our slice instance to match. */
359 error = g_bsd_modify(gp, buf + ms->labeloffset);
360 if (!error) {
361 cp = LIST_FIRST(&gp->consumer);
362 if (ms->labeloffset == ALPHA_LABEL_OFFSET) {
363 sum = 0;
364 for (i = 0; i < 63; i++)
365 sum += le64dec(buf + i * 8);
366 le64enc(buf + 504, sum);
367 }
368 error = g_write_data(cp, 0, buf, BBSIZE);
369 }
370 g_topology_unlock();
371 PICKUP_GIANT();
372 }
373 g_free(buf);
374 return (error);
375 }
376 case DIOCSDINFO:
377 case DIOCWDINFO: {
378 if (!(fflag & FWRITE))
379 return (EPERM);
380 label = g_malloc(LABELSIZE, M_WAITOK);
381 /* The disklabel to set is the ioctl argument. */
382 bsd_disklabel_le_enc(label, data);
383
384 DROP_GIANT();
385 g_topology_lock();
386 /* Validate and modify our slice instance to match. */
387 error = g_bsd_modify(gp, label);
388 if (error == 0 && cmd == DIOCWDINFO)
389 error = g_bsd_writelabel(gp, NULL);
390 g_topology_unlock();
391 PICKUP_GIANT();
392 g_free(label);
393 return(error);
394 }
395 default:
396 return (ENOIOCTL);
397 }
398 }
399
400 static int
401 g_bsd_start(struct bio *bp)
402 {
403 struct g_geom *gp;
404 struct g_bsd_softc *ms;
405 struct g_slicer *gsp;
406
407 gp = bp->bio_to->geom;
408 gsp = gp->softc;
409 ms = gsp->softc;
410 if (bp->bio_cmd == BIO_GETATTR) {
411 if (g_handleattr(bp, "BSD::labelsum", ms->labelsum,
412 sizeof(ms->labelsum)))
413 return (1);
414 }
415 return (0);
416 }
417
418 /*
419 * Dump configuration information in XML format.
420 * Notice that the function is called once for the geom and once for each
421 * consumer and provider. We let g_slice_dumpconf() do most of the work.
422 */
423 static void
424 g_bsd_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
425 {
426 struct g_bsd_softc *ms;
427 struct g_slicer *gsp;
428
429 gsp = gp->softc;
430 ms = gsp->softc;
431 g_slice_dumpconf(sb, indent, gp, cp, pp);
432 if (indent != NULL && pp == NULL && cp == NULL) {
433 sbuf_printf(sb, "%s<labeloffset>%jd</labeloffset>\n",
434 indent, (intmax_t)ms->labeloffset);
435 sbuf_printf(sb, "%s<rawoffset>%jd</rawoffset>\n",
436 indent, (intmax_t)ms->rawoffset);
437 sbuf_printf(sb, "%s<mbroffset>%jd</mbroffset>\n",
438 indent, (intmax_t)ms->mbroffset);
439 } else if (pp != NULL) {
440 if (indent == NULL)
441 sbuf_printf(sb, " ty %d",
442 ms->ondisk.d_partitions[pp->index].p_fstype);
443 else
444 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
445 ms->ondisk.d_partitions[pp->index].p_fstype);
446 }
447 }
448
449 /*
450 * The taste function is called from the event-handler, with the topology
451 * lock already held and a provider to examine. The flags are unused.
452 *
453 * If flags == G_TF_NORMAL, the idea is to take a bite of the provider and
454 * if we find valid, consistent magic on it, build a geom on it.
455 *
456 * There may be cases where the operator would like to put a BSD-geom on
457 * providers which do not meet all of the requirements. This can be done
458 * by instead passing the G_TF_INSIST flag, which will override these
459 * checks.
460 *
461 * The final flags value is G_TF_TRANSPARENT, which instructs the method
462 * to put a geom on top of the provider and configure it to be as transparent
463 * as possible. This is not really relevant to the BSD method and therefore
464 * not implemented here.
465 */
466
467 static struct uuid freebsd_slice = GPT_ENT_TYPE_FREEBSD;
468
469 static struct g_geom *
470 g_bsd_taste(struct g_class *mp, struct g_provider *pp, int flags)
471 {
472 struct g_geom *gp;
473 struct g_consumer *cp;
474 int error, i;
475 struct g_bsd_softc *ms;
476 u_int secsize;
477 struct g_slicer *gsp;
478 u_char hash[16];
479 MD5_CTX md5sum;
480 struct uuid uuid;
481
482 g_trace(G_T_TOPOLOGY, "bsd_taste(%s,%s)", mp->name, pp->name);
483 g_topology_assert();
484
485 /* We don't implement transparent inserts. */
486 if (flags == G_TF_TRANSPARENT)
487 return (NULL);
488
489 /*
490 * BSD labels are a subclass of the general "slicing" topology so
491 * a lot of the work can be done by the common "slice" code.
492 * Create a geom with space for MAXPARTITIONS providers, one consumer
493 * and a softc structure for us. Specify the provider to attach
494 * the consumer to and our "start" routine for special requests.
495 * The provider is opened with mode (1,0,0) so we can do reads
496 * from it.
497 */
498 gp = g_slice_new(mp, MAXPARTITIONS, pp, &cp, &ms,
499 sizeof(*ms), g_bsd_start);
500 if (gp == NULL)
501 return (NULL);
502
503 /* Get the geom_slicer softc from the geom. */
504 gsp = gp->softc;
505
506 /*
507 * The do...while loop here allows us to have multiple escapes
508 * using a simple "break". This improves code clarity without
509 * ending up in deep nesting and without using goto or come from.
510 */
511 do {
512 /*
513 * If the provider is an MBR we will only auto attach
514 * to type 165 slices in the G_TF_NORMAL case. We will
515 * attach to any other type.
516 */
517 error = g_getattr("MBR::type", cp, &i);
518 if (!error) {
519 if (i != 165 && flags == G_TF_NORMAL)
520 break;
521 error = g_getattr("MBR::offset", cp, &ms->mbroffset);
522 if (error)
523 break;
524 }
525
526 /* Same thing if we are inside a PC98 */
527 error = g_getattr("PC98::type", cp, &i);
528 if (!error) {
529 if (i != 0xc494 && flags == G_TF_NORMAL)
530 break;
531 error = g_getattr("PC98::offset", cp, &ms->mbroffset);
532 if (error)
533 break;
534 }
535
536 /* Same thing if we are inside a GPT */
537 error = g_getattr("GPT::type", cp, &uuid);
538 if (!error) {
539 if (memcmp(&uuid, &freebsd_slice, sizeof(uuid)) != 0 &&
540 flags == G_TF_NORMAL)
541 break;
542 }
543
544 /* Get sector size, we need it to read data. */
545 secsize = cp->provider->sectorsize;
546 if (secsize < 512)
547 break;
548
549 /* First look for a label at the start of the second sector. */
550 error = g_bsd_try(gp, gsp, cp, secsize, ms, secsize);
551
552 /*
553 * If sector size is not 512 the label still can be at
554 * offset 512, not at the start of the second sector. At least
555 * it's true for labels created by the FreeBSD's bsdlabel(8).
556 */
557 if (error && secsize != HISTORIC_LABEL_OFFSET)
558 error = g_bsd_try(gp, gsp, cp, secsize, ms,
559 HISTORIC_LABEL_OFFSET);
560
561 /* Next, look for alpha labels */
562 if (error)
563 error = g_bsd_try(gp, gsp, cp, secsize, ms,
564 ALPHA_LABEL_OFFSET);
565
566 /* If we didn't find a label, punt. */
567 if (error)
568 break;
569
570 /*
571 * In order to avoid recursively attaching to the same
572 * on-disk label (it's usually visible through the 'c'
573 * partition) we calculate an MD5 and ask if other BSD's
574 * below us love that label. If they do, we don't.
575 */
576 MD5Init(&md5sum);
577 MD5Update(&md5sum, ms->label, sizeof(ms->label));
578 MD5Final(ms->labelsum, &md5sum);
579
580 error = g_getattr("BSD::labelsum", cp, &hash);
581 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash)))
582 break;
583
584 /*
585 * Process the found disklabel, and modify our "slice"
586 * instance to match it, if possible.
587 */
588 error = g_bsd_modify(gp, ms->label);
589 } while (0);
590
591 /* Success or failure, we can close our provider now. */
592 g_access(cp, -1, 0, 0);
593
594 /* If we have configured any providers, return the new geom. */
595 if (gsp->nprovider > 0) {
596 g_slice_conf_hot(gp, 0, ms->labeloffset, LABELSIZE,
597 G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
598 gsp->hot = g_bsd_hotwrite;
599 return (gp);
600 }
601 /*
602 * ...else push the "self-destruct" button, by spoiling our own
603 * consumer. This triggers a call to g_slice_spoiled which will
604 * dismantle what was setup.
605 */
606 g_slice_spoiled(cp);
607 return (NULL);
608 }
609
610 struct h0h0 {
611 struct g_geom *gp;
612 struct g_bsd_softc *ms;
613 u_char *label;
614 int error;
615 };
616
617 static void
618 g_bsd_callconfig(void *arg, int flag)
619 {
620 struct h0h0 *hp;
621
622 hp = arg;
623 hp->error = g_bsd_modify(hp->gp, hp->label);
624 if (!hp->error)
625 hp->error = g_bsd_writelabel(hp->gp, NULL);
626 }
627
628 /*
629 * NB! curthread is user process which GCTL'ed.
630 */
631 static void
632 g_bsd_config(struct gctl_req *req, struct g_class *mp, char const *verb)
633 {
634 u_char *label;
635 int error;
636 struct h0h0 h0h0;
637 struct g_geom *gp;
638 struct g_slicer *gsp;
639 struct g_consumer *cp;
640 struct g_bsd_softc *ms;
641
642 g_topology_assert();
643 gp = gctl_get_geom(req, mp, "geom");
644 if (gp == NULL)
645 return;
646 cp = LIST_FIRST(&gp->consumer);
647 gsp = gp->softc;
648 ms = gsp->softc;
649 if (!strcmp(verb, "read mbroffset")) {
650 gctl_set_param_err(req, "mbroffset", &ms->mbroffset,
651 sizeof(ms->mbroffset));
652 return;
653 } else if (!strcmp(verb, "write label")) {
654 label = gctl_get_paraml(req, "label", LABELSIZE);
655 if (label == NULL)
656 return;
657 h0h0.gp = gp;
658 h0h0.ms = gsp->softc;
659 h0h0.label = label;
660 h0h0.error = -1;
661 /* XXX: Does this reference register with our selfdestruct code ? */
662 error = g_access(cp, 1, 1, 1);
663 if (error) {
664 gctl_error(req, "could not access consumer");
665 return;
666 }
667 g_bsd_callconfig(&h0h0, 0);
668 error = h0h0.error;
669 g_access(cp, -1, -1, -1);
670 } else if (!strcmp(verb, "write bootcode")) {
671 label = gctl_get_paraml(req, "bootcode", BBSIZE);
672 if (label == NULL)
673 return;
674 /* XXX: Does this reference register with our selfdestruct code ? */
675 error = g_access(cp, 1, 1, 1);
676 if (error) {
677 gctl_error(req, "could not access consumer");
678 return;
679 }
680 error = g_bsd_writelabel(gp, label);
681 g_access(cp, -1, -1, -1);
682 } else {
683 gctl_error(req, "Unknown verb parameter");
684 }
685
686 return;
687 }
688
689 /* Finally, register with GEOM infrastructure. */
690 static struct g_class g_bsd_class = {
691 .name = BSD_CLASS_NAME,
692 .version = G_VERSION,
693 .taste = g_bsd_taste,
694 .ctlreq = g_bsd_config,
695 .dumpconf = g_bsd_dumpconf,
696 .ioctl = g_bsd_ioctl,
697 };
698
699 DECLARE_GEOM_CLASS(g_bsd_class, g_bsd);
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