FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_disk.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 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: releng/10.1/sys/geom/geom_disk.c 273776 2014-10-28 14:01:58Z mav $");
38
39 #include "opt_geom.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
45 #include <sys/bio.h>
46 #include <sys/ctype.h>
47 #include <sys/fcntl.h>
48 #include <sys/malloc.h>
49 #include <sys/sbuf.h>
50 #include <sys/devicestat.h>
51 #include <machine/md_var.h>
52
53 #include <sys/lock.h>
54 #include <sys/mutex.h>
55 #include <geom/geom.h>
56 #include <geom/geom_disk.h>
57 #include <geom/geom_int.h>
58
59 #include <dev/led/led.h>
60
61 struct g_disk_softc {
62 struct mtx done_mtx;
63 struct disk *dp;
64 struct sysctl_ctx_list sysctl_ctx;
65 struct sysctl_oid *sysctl_tree;
66 char led[64];
67 uint32_t state;
68 struct mtx start_mtx;
69 };
70
71 static g_access_t g_disk_access;
72 static g_start_t g_disk_start;
73 static g_ioctl_t g_disk_ioctl;
74 static g_dumpconf_t g_disk_dumpconf;
75 static g_provgone_t g_disk_providergone;
76
77 static struct g_class g_disk_class = {
78 .name = G_DISK_CLASS_NAME,
79 .version = G_VERSION,
80 .start = g_disk_start,
81 .access = g_disk_access,
82 .ioctl = g_disk_ioctl,
83 .providergone = g_disk_providergone,
84 .dumpconf = g_disk_dumpconf,
85 };
86
87 SYSCTL_DECL(_kern_geom);
88 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
89 "GEOM_DISK stuff");
90
91 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
92
93 static void __inline
94 g_disk_lock_giant(struct disk *dp)
95 {
96
97 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
98 mtx_lock(&Giant);
99 }
100
101 static void __inline
102 g_disk_unlock_giant(struct disk *dp)
103 {
104
105 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
106 mtx_unlock(&Giant);
107 }
108
109 static int
110 g_disk_access(struct g_provider *pp, int r, int w, int e)
111 {
112 struct disk *dp;
113 struct g_disk_softc *sc;
114 int error;
115
116 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
117 pp->name, r, w, e);
118 g_topology_assert();
119 sc = pp->private;
120 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
121 /*
122 * Allow decreasing access count even if disk is not
123 * avaliable anymore.
124 */
125 if (r <= 0 && w <= 0 && e <= 0)
126 return (0);
127 return (ENXIO);
128 }
129 r += pp->acr;
130 w += pp->acw;
131 e += pp->ace;
132 error = 0;
133 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
134 if (dp->d_open != NULL) {
135 g_disk_lock_giant(dp);
136 error = dp->d_open(dp);
137 if (bootverbose && error != 0)
138 printf("Opened disk %s -> %d\n",
139 pp->name, error);
140 g_disk_unlock_giant(dp);
141 if (error != 0)
142 return (error);
143 }
144 pp->mediasize = dp->d_mediasize;
145 pp->sectorsize = dp->d_sectorsize;
146 if (dp->d_maxsize == 0) {
147 printf("WARNING: Disk drive %s%d has no d_maxsize\n",
148 dp->d_name, dp->d_unit);
149 dp->d_maxsize = DFLTPHYS;
150 }
151 if (dp->d_delmaxsize == 0) {
152 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
153 printf("WARNING: Disk drive %s%d has no "
154 "d_delmaxsize\n", dp->d_name, dp->d_unit);
155 }
156 dp->d_delmaxsize = dp->d_maxsize;
157 }
158 pp->stripeoffset = dp->d_stripeoffset;
159 pp->stripesize = dp->d_stripesize;
160 dp->d_flags |= DISKFLAG_OPEN;
161 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
162 if (dp->d_close != NULL) {
163 g_disk_lock_giant(dp);
164 error = dp->d_close(dp);
165 if (error != 0)
166 printf("Closed disk %s -> %d\n",
167 pp->name, error);
168 g_disk_unlock_giant(dp);
169 }
170 sc->state = G_STATE_ACTIVE;
171 if (sc->led[0] != 0)
172 led_set(sc->led, "");
173 dp->d_flags &= ~DISKFLAG_OPEN;
174 }
175 return (error);
176 }
177
178 static void
179 g_disk_kerneldump(struct bio *bp, struct disk *dp)
180 {
181 struct g_kerneldump *gkd;
182 struct g_geom *gp;
183
184 gkd = (struct g_kerneldump*)bp->bio_data;
185 gp = bp->bio_to->geom;
186 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)",
187 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
188 if (dp->d_dump == NULL) {
189 g_io_deliver(bp, ENODEV);
190 return;
191 }
192 gkd->di.dumper = dp->d_dump;
193 gkd->di.priv = dp;
194 gkd->di.blocksize = dp->d_sectorsize;
195 gkd->di.maxiosize = dp->d_maxsize;
196 gkd->di.mediaoffset = gkd->offset;
197 if ((gkd->offset + gkd->length) > dp->d_mediasize)
198 gkd->length = dp->d_mediasize - gkd->offset;
199 gkd->di.mediasize = gkd->length;
200 g_io_deliver(bp, 0);
201 }
202
203 static void
204 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
205 {
206 const char *cmd;
207
208 memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
209 if (sc->led[0] != 0) {
210 switch (sc->state) {
211 case G_STATE_FAILED:
212 cmd = "1";
213 break;
214 case G_STATE_REBUILD:
215 cmd = "f5";
216 break;
217 case G_STATE_RESYNC:
218 cmd = "f1";
219 break;
220 default:
221 cmd = "";
222 break;
223 }
224 led_set(sc->led, cmd);
225 }
226 g_io_deliver(bp, 0);
227 }
228
229 static void
230 g_disk_done(struct bio *bp)
231 {
232 struct bintime now;
233 struct bio *bp2;
234 struct g_disk_softc *sc;
235
236 /* See "notes" for why we need a mutex here */
237 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
238 bp2 = bp->bio_parent;
239 sc = bp2->bio_to->private;
240 bp->bio_completed = bp->bio_length - bp->bio_resid;
241 binuptime(&now);
242 mtx_lock(&sc->done_mtx);
243 if (bp2->bio_error == 0)
244 bp2->bio_error = bp->bio_error;
245 bp2->bio_completed += bp->bio_completed;
246 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0)
247 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now);
248 bp2->bio_inbed++;
249 if (bp2->bio_children == bp2->bio_inbed) {
250 mtx_unlock(&sc->done_mtx);
251 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
252 g_io_deliver(bp2, bp2->bio_error);
253 } else
254 mtx_unlock(&sc->done_mtx);
255 g_destroy_bio(bp);
256 }
257
258 static int
259 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
260 {
261 struct disk *dp;
262 struct g_disk_softc *sc;
263 int error;
264
265 sc = pp->private;
266 dp = sc->dp;
267
268 if (dp->d_ioctl == NULL)
269 return (ENOIOCTL);
270 g_disk_lock_giant(dp);
271 error = dp->d_ioctl(dp, cmd, data, fflag, td);
272 g_disk_unlock_giant(dp);
273 return (error);
274 }
275
276 static void
277 g_disk_start(struct bio *bp)
278 {
279 struct bio *bp2, *bp3;
280 struct disk *dp;
281 struct g_disk_softc *sc;
282 int error;
283 off_t off;
284
285 sc = bp->bio_to->private;
286 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
287 g_io_deliver(bp, ENXIO);
288 return;
289 }
290 error = EJUSTRETURN;
291 switch(bp->bio_cmd) {
292 case BIO_DELETE:
293 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
294 error = EOPNOTSUPP;
295 break;
296 }
297 /* fall-through */
298 case BIO_READ:
299 case BIO_WRITE:
300 off = 0;
301 bp3 = NULL;
302 bp2 = g_clone_bio(bp);
303 if (bp2 == NULL) {
304 error = ENOMEM;
305 break;
306 }
307 do {
308 off_t d_maxsize;
309
310 d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
311 dp->d_delmaxsize : dp->d_maxsize;
312 bp2->bio_offset += off;
313 bp2->bio_length -= off;
314 if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
315 bp2->bio_data += off;
316 } else {
317 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
318 != 0,
319 ("unmapped bio not supported by disk %s",
320 dp->d_name));
321 bp2->bio_ma += off / PAGE_SIZE;
322 bp2->bio_ma_offset += off;
323 bp2->bio_ma_offset %= PAGE_SIZE;
324 bp2->bio_ma_n -= off / PAGE_SIZE;
325 }
326 if (bp2->bio_length > d_maxsize) {
327 /*
328 * XXX: If we have a stripesize we should really
329 * use it here. Care should be taken in the delete
330 * case if this is done as deletes can be very
331 * sensitive to size given how they are processed.
332 */
333 bp2->bio_length = d_maxsize;
334 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
335 bp2->bio_ma_n = howmany(
336 bp2->bio_ma_offset +
337 bp2->bio_length, PAGE_SIZE);
338 }
339 off += d_maxsize;
340 /*
341 * To avoid a race, we need to grab the next bio
342 * before we schedule this one. See "notes".
343 */
344 bp3 = g_clone_bio(bp);
345 if (bp3 == NULL)
346 bp->bio_error = ENOMEM;
347 }
348 bp2->bio_done = g_disk_done;
349 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
350 bp2->bio_bcount = bp2->bio_length;
351 bp2->bio_disk = dp;
352 mtx_lock(&sc->start_mtx);
353 devstat_start_transaction_bio(dp->d_devstat, bp2);
354 mtx_unlock(&sc->start_mtx);
355 g_disk_lock_giant(dp);
356 dp->d_strategy(bp2);
357 g_disk_unlock_giant(dp);
358 bp2 = bp3;
359 bp3 = NULL;
360 } while (bp2 != NULL);
361 break;
362 case BIO_GETATTR:
363 /* Give the driver a chance to override */
364 if (dp->d_getattr != NULL) {
365 if (bp->bio_disk == NULL)
366 bp->bio_disk = dp;
367 error = dp->d_getattr(bp);
368 if (error != -1)
369 break;
370 error = EJUSTRETURN;
371 }
372 if (g_handleattr_int(bp, "GEOM::candelete",
373 (dp->d_flags & DISKFLAG_CANDELETE) != 0))
374 break;
375 else if (g_handleattr_int(bp, "GEOM::fwsectors",
376 dp->d_fwsectors))
377 break;
378 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
379 break;
380 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
381 break;
382 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
383 break;
384 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor",
385 dp->d_hba_vendor))
386 break;
387 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device",
388 dp->d_hba_device))
389 break;
390 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor",
391 dp->d_hba_subvendor))
392 break;
393 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice",
394 dp->d_hba_subdevice))
395 break;
396 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
397 g_disk_kerneldump(bp, dp);
398 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
399 g_disk_setstate(bp, sc);
400 else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) {
401 uint64_t v;
402
403 if ((dp->d_flags & DISKFLAG_LACKS_ROTRATE) == 0)
404 v = dp->d_rotation_rate;
405 else
406 v = 0; /* rate unknown */
407 g_handleattr_uint16_t(bp, "GEOM::rotation_rate", v);
408 break;
409 } else
410 error = ENOIOCTL;
411 break;
412 case BIO_FLUSH:
413 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
414 bp->bio_to->name);
415 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
416 error = EOPNOTSUPP;
417 break;
418 }
419 bp2 = g_clone_bio(bp);
420 if (bp2 == NULL) {
421 g_io_deliver(bp, ENOMEM);
422 return;
423 }
424 bp2->bio_done = g_disk_done;
425 bp2->bio_disk = dp;
426 mtx_lock(&sc->start_mtx);
427 devstat_start_transaction_bio(dp->d_devstat, bp2);
428 mtx_unlock(&sc->start_mtx);
429 g_disk_lock_giant(dp);
430 dp->d_strategy(bp2);
431 g_disk_unlock_giant(dp);
432 break;
433 default:
434 error = EOPNOTSUPP;
435 break;
436 }
437 if (error != EJUSTRETURN)
438 g_io_deliver(bp, error);
439 return;
440 }
441
442 static void
443 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
444 {
445 struct bio *bp;
446 struct disk *dp;
447 struct g_disk_softc *sc;
448 char *buf;
449 int res = 0;
450
451 sc = gp->softc;
452 if (sc == NULL || (dp = sc->dp) == NULL)
453 return;
454 if (indent == NULL) {
455 sbuf_printf(sb, " hd %u", dp->d_fwheads);
456 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
457 return;
458 }
459 if (pp != NULL) {
460 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
461 indent, dp->d_fwheads);
462 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
463 indent, dp->d_fwsectors);
464 if (dp->d_getattr != NULL) {
465 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
466 bp = g_alloc_bio();
467 bp->bio_disk = dp;
468 bp->bio_attribute = "GEOM::ident";
469 bp->bio_length = DISK_IDENT_SIZE;
470 bp->bio_data = buf;
471 res = dp->d_getattr(bp);
472 sbuf_printf(sb, "%s<ident>", indent);
473 g_conf_printf_escaped(sb, "%s",
474 res == 0 ? buf: dp->d_ident);
475 sbuf_printf(sb, "</ident>\n");
476 bp->bio_attribute = "GEOM::lunid";
477 bp->bio_length = DISK_IDENT_SIZE;
478 bp->bio_data = buf;
479 if (dp->d_getattr(bp) == 0) {
480 sbuf_printf(sb, "%s<lunid>", indent);
481 g_conf_printf_escaped(sb, "%s", buf);
482 sbuf_printf(sb, "</lunid>\n");
483 }
484 bp->bio_attribute = "GEOM::lunname";
485 bp->bio_length = DISK_IDENT_SIZE;
486 bp->bio_data = buf;
487 if (dp->d_getattr(bp) == 0) {
488 sbuf_printf(sb, "%s<lunname>", indent);
489 g_conf_printf_escaped(sb, "%s", buf);
490 sbuf_printf(sb, "</lunname>\n");
491 }
492 g_destroy_bio(bp);
493 g_free(buf);
494 } else {
495 sbuf_printf(sb, "%s<ident>", indent);
496 g_conf_printf_escaped(sb, "%s", dp->d_ident);
497 sbuf_printf(sb, "</ident>\n");
498 }
499 sbuf_printf(sb, "%s<descr>", indent);
500 g_conf_printf_escaped(sb, "%s", dp->d_descr);
501 sbuf_printf(sb, "</descr>\n");
502 }
503 }
504
505 static void
506 g_disk_resize(void *ptr, int flag)
507 {
508 struct disk *dp;
509 struct g_geom *gp;
510 struct g_provider *pp;
511
512 if (flag == EV_CANCEL)
513 return;
514 g_topology_assert();
515
516 dp = ptr;
517 gp = dp->d_geom;
518
519 if (dp->d_destroyed || gp == NULL)
520 return;
521
522 LIST_FOREACH(pp, &gp->provider, provider) {
523 if (pp->sectorsize != 0 &&
524 pp->sectorsize != dp->d_sectorsize)
525 g_wither_provider(pp, ENXIO);
526 else
527 g_resize_provider(pp, dp->d_mediasize);
528 }
529 }
530
531 static void
532 g_disk_create(void *arg, int flag)
533 {
534 struct g_geom *gp;
535 struct g_provider *pp;
536 struct disk *dp;
537 struct g_disk_softc *sc;
538 char tmpstr[80];
539
540 if (flag == EV_CANCEL)
541 return;
542 g_topology_assert();
543 dp = arg;
544 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
545 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF);
546 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
547 sc->dp = dp;
548 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
549 gp->softc = sc;
550 pp = g_new_providerf(gp, "%s", gp->name);
551 devstat_remove_entry(pp->stat);
552 pp->stat = NULL;
553 dp->d_devstat->id = pp;
554 pp->mediasize = dp->d_mediasize;
555 pp->sectorsize = dp->d_sectorsize;
556 pp->stripeoffset = dp->d_stripeoffset;
557 pp->stripesize = dp->d_stripesize;
558 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
559 pp->flags |= G_PF_ACCEPT_UNMAPPED;
560 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0)
561 pp->flags |= G_PF_DIRECT_SEND;
562 pp->flags |= G_PF_DIRECT_RECEIVE;
563 if (bootverbose)
564 printf("GEOM: new disk %s\n", gp->name);
565 sysctl_ctx_init(&sc->sysctl_ctx);
566 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
567 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
568 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
569 CTLFLAG_RD, 0, tmpstr);
570 if (sc->sysctl_tree != NULL) {
571 snprintf(tmpstr, sizeof(tmpstr),
572 "kern.geom.disk.%s.led", gp->name);
573 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
574 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
575 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
576 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
577 "LED name");
578 }
579 pp->private = sc;
580 dp->d_geom = gp;
581 g_error_provider(pp, 0);
582 }
583
584 /*
585 * We get this callback after all of the consumers have gone away, and just
586 * before the provider is freed. If the disk driver provided a d_gone
587 * callback, let them know that it is okay to free resources -- they won't
588 * be getting any more accesses from GEOM.
589 */
590 static void
591 g_disk_providergone(struct g_provider *pp)
592 {
593 struct disk *dp;
594 struct g_disk_softc *sc;
595
596 sc = (struct g_disk_softc *)pp->private;
597 dp = sc->dp;
598 if (dp != NULL && dp->d_gone != NULL)
599 dp->d_gone(dp);
600 if (sc->sysctl_tree != NULL) {
601 sysctl_ctx_free(&sc->sysctl_ctx);
602 sc->sysctl_tree = NULL;
603 }
604 if (sc->led[0] != 0) {
605 led_set(sc->led, "");
606 sc->led[0] = 0;
607 }
608 pp->private = NULL;
609 pp->geom->softc = NULL;
610 mtx_destroy(&sc->done_mtx);
611 mtx_destroy(&sc->start_mtx);
612 g_free(sc);
613 }
614
615 static void
616 g_disk_destroy(void *ptr, int flag)
617 {
618 struct disk *dp;
619 struct g_geom *gp;
620 struct g_disk_softc *sc;
621
622 g_topology_assert();
623 dp = ptr;
624 gp = dp->d_geom;
625 if (gp != NULL) {
626 sc = gp->softc;
627 if (sc != NULL)
628 sc->dp = NULL;
629 dp->d_geom = NULL;
630 g_wither_geom(gp, ENXIO);
631 }
632 g_free(dp);
633 }
634
635 /*
636 * We only allow printable characters in disk ident,
637 * the rest is converted to 'x<HH>'.
638 */
639 static void
640 g_disk_ident_adjust(char *ident, size_t size)
641 {
642 char *p, tmp[4], newid[DISK_IDENT_SIZE];
643
644 newid[0] = '\0';
645 for (p = ident; *p != '\0'; p++) {
646 if (isprint(*p)) {
647 tmp[0] = *p;
648 tmp[1] = '\0';
649 } else {
650 snprintf(tmp, sizeof(tmp), "x%02hhx",
651 *(unsigned char *)p);
652 }
653 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
654 break;
655 }
656 bzero(ident, size);
657 strlcpy(ident, newid, size);
658 }
659
660 struct disk *
661 disk_alloc(void)
662 {
663
664 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
665 }
666
667 void
668 disk_create(struct disk *dp, int version)
669 {
670
671 if (version != DISK_VERSION) {
672 printf("WARNING: Attempt to add disk %s%d %s",
673 dp->d_name, dp->d_unit,
674 " using incompatible ABI version of disk(9)\n");
675 printf("WARNING: Ignoring disk %s%d\n",
676 dp->d_name, dp->d_unit);
677 return;
678 }
679 if (version < DISK_VERSION_04)
680 dp->d_flags |= DISKFLAG_LACKS_ROTRATE;
681 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
682 KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
683 KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
684 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
685 if (dp->d_devstat == NULL)
686 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
687 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
688 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
689 dp->d_geom = NULL;
690 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
691 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
692 }
693
694 void
695 disk_destroy(struct disk *dp)
696 {
697
698 g_cancel_event(dp);
699 dp->d_destroyed = 1;
700 if (dp->d_devstat != NULL)
701 devstat_remove_entry(dp->d_devstat);
702 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
703 }
704
705 void
706 disk_gone(struct disk *dp)
707 {
708 struct g_geom *gp;
709 struct g_provider *pp;
710
711 gp = dp->d_geom;
712 if (gp != NULL) {
713 pp = LIST_FIRST(&gp->provider);
714 if (pp != NULL) {
715 KASSERT(LIST_NEXT(pp, provider) == NULL,
716 ("geom %p has more than one provider", gp));
717 g_wither_provider(pp, ENXIO);
718 }
719 }
720 }
721
722 void
723 disk_attr_changed(struct disk *dp, const char *attr, int flag)
724 {
725 struct g_geom *gp;
726 struct g_provider *pp;
727
728 gp = dp->d_geom;
729 if (gp != NULL)
730 LIST_FOREACH(pp, &gp->provider, provider)
731 (void)g_attr_changed(pp, attr, flag);
732 }
733
734 void
735 disk_media_changed(struct disk *dp, int flag)
736 {
737 struct g_geom *gp;
738 struct g_provider *pp;
739
740 gp = dp->d_geom;
741 if (gp != NULL) {
742 pp = LIST_FIRST(&gp->provider);
743 if (pp != NULL) {
744 KASSERT(LIST_NEXT(pp, provider) == NULL,
745 ("geom %p has more than one provider", gp));
746 g_media_changed(pp, flag);
747 }
748 }
749 }
750
751 void
752 disk_media_gone(struct disk *dp, int flag)
753 {
754 struct g_geom *gp;
755 struct g_provider *pp;
756
757 gp = dp->d_geom;
758 if (gp != NULL) {
759 pp = LIST_FIRST(&gp->provider);
760 if (pp != NULL) {
761 KASSERT(LIST_NEXT(pp, provider) == NULL,
762 ("geom %p has more than one provider", gp));
763 g_media_gone(pp, flag);
764 }
765 }
766 }
767
768 int
769 disk_resize(struct disk *dp, int flag)
770 {
771
772 if (dp->d_destroyed || dp->d_geom == NULL)
773 return (0);
774
775 return (g_post_event(g_disk_resize, dp, flag, NULL));
776 }
777
778 static void
779 g_kern_disks(void *p, int flag __unused)
780 {
781 struct sbuf *sb;
782 struct g_geom *gp;
783 char *sp;
784
785 sb = p;
786 sp = "";
787 g_topology_assert();
788 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
789 sbuf_printf(sb, "%s%s", sp, gp->name);
790 sp = " ";
791 }
792 sbuf_finish(sb);
793 }
794
795 static int
796 sysctl_disks(SYSCTL_HANDLER_ARGS)
797 {
798 int error;
799 struct sbuf *sb;
800
801 sb = sbuf_new_auto();
802 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
803 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
804 sbuf_delete(sb);
805 return error;
806 }
807
808 SYSCTL_PROC(_kern, OID_AUTO, disks,
809 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
810 sysctl_disks, "A", "names of available disks");
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