geom_disk.c revision 242322
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: head/sys/geom/geom_disk.c 242322 2012-10-29 17:52:43Z trasz $"); 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/sysctl.h> 51#include <sys/devicestat.h> 52#include <machine/md_var.h> 53 54#include <sys/lock.h> 55#include <sys/mutex.h> 56#include <geom/geom.h> 57#include <geom/geom_disk.h> 58#include <geom/geom_int.h> 59 60#include <dev/led/led.h> 61 62struct g_disk_softc { 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}; 69 70static struct mtx g_disk_done_mtx; 71 72static g_access_t g_disk_access; 73static g_init_t g_disk_init; 74static g_fini_t g_disk_fini; 75static g_start_t g_disk_start; 76static g_ioctl_t g_disk_ioctl; 77static g_dumpconf_t g_disk_dumpconf; 78static g_provgone_t g_disk_providergone; 79 80static struct g_class g_disk_class = { 81 .name = "DISK", 82 .version = G_VERSION, 83 .init = g_disk_init, 84 .fini = g_disk_fini, 85 .start = g_disk_start, 86 .access = g_disk_access, 87 .ioctl = g_disk_ioctl, 88 .providergone = g_disk_providergone, 89 .dumpconf = g_disk_dumpconf, 90}; 91 92SYSCTL_DECL(_kern_geom); 93static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 94 "GEOM_DISK stuff"); 95 96static void 97g_disk_init(struct g_class *mp __unused) 98{ 99 100 mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF); 101} 102 103static void 104g_disk_fini(struct g_class *mp __unused) 105{ 106 107 mtx_destroy(&g_disk_done_mtx); 108} 109 110DECLARE_GEOM_CLASS(g_disk_class, g_disk); 111 112static void __inline 113g_disk_lock_giant(struct disk *dp) 114{ 115 116 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 117 mtx_lock(&Giant); 118} 119 120static void __inline 121g_disk_unlock_giant(struct disk *dp) 122{ 123 124 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 125 mtx_unlock(&Giant); 126} 127 128static int 129g_disk_access(struct g_provider *pp, int r, int w, int e) 130{ 131 struct disk *dp; 132 struct g_disk_softc *sc; 133 int error; 134 135 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 136 pp->name, r, w, e); 137 g_topology_assert(); 138 sc = pp->geom->softc; 139 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 140 /* 141 * Allow decreasing access count even if disk is not 142 * avaliable anymore. 143 */ 144 if (r <= 0 && w <= 0 && e <= 0) 145 return (0); 146 return (ENXIO); 147 } 148 r += pp->acr; 149 w += pp->acw; 150 e += pp->ace; 151 error = 0; 152 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 153 if (dp->d_open != NULL) { 154 g_disk_lock_giant(dp); 155 error = dp->d_open(dp); 156 if (bootverbose && error != 0) 157 printf("Opened disk %s -> %d\n", 158 pp->name, error); 159 g_disk_unlock_giant(dp); 160 } 161 pp->mediasize = dp->d_mediasize; 162 pp->sectorsize = dp->d_sectorsize; 163 pp->stripeoffset = dp->d_stripeoffset; 164 pp->stripesize = dp->d_stripesize; 165 dp->d_flags |= DISKFLAG_OPEN; 166 if (dp->d_maxsize == 0) { 167 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 168 dp->d_name, dp->d_unit); 169 dp->d_maxsize = DFLTPHYS; 170 } 171 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 172 if (dp->d_close != NULL) { 173 g_disk_lock_giant(dp); 174 error = dp->d_close(dp); 175 if (error != 0) 176 printf("Closed disk %s -> %d\n", 177 pp->name, error); 178 g_disk_unlock_giant(dp); 179 } 180 sc->state = G_STATE_ACTIVE; 181 if (sc->led[0] != 0) 182 led_set(sc->led, "0"); 183 dp->d_flags &= ~DISKFLAG_OPEN; 184 } 185 return (error); 186} 187 188static void 189g_disk_kerneldump(struct bio *bp, struct disk *dp) 190{ 191 struct g_kerneldump *gkd; 192 struct g_geom *gp; 193 194 gkd = (struct g_kerneldump*)bp->bio_data; 195 gp = bp->bio_to->geom; 196 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 197 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 198 if (dp->d_dump == NULL) { 199 g_io_deliver(bp, ENODEV); 200 return; 201 } 202 gkd->di.dumper = dp->d_dump; 203 gkd->di.priv = dp; 204 gkd->di.blocksize = dp->d_sectorsize; 205 gkd->di.maxiosize = dp->d_maxsize; 206 gkd->di.mediaoffset = gkd->offset; 207 if ((gkd->offset + gkd->length) > dp->d_mediasize) 208 gkd->length = dp->d_mediasize - gkd->offset; 209 gkd->di.mediasize = gkd->length; 210 g_io_deliver(bp, 0); 211} 212 213static void 214g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 215{ 216 const char *cmd; 217 218 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 219 if (sc->led[0] != 0) { 220 switch (sc->state) { 221 case G_STATE_FAILED: 222 cmd = "1"; 223 break; 224 case G_STATE_REBUILD: 225 cmd = "f5"; 226 break; 227 case G_STATE_RESYNC: 228 cmd = "f1"; 229 break; 230 default: 231 cmd = "0"; 232 break; 233 } 234 led_set(sc->led, cmd); 235 } 236 g_io_deliver(bp, 0); 237} 238 239static void 240g_disk_done(struct bio *bp) 241{ 242 struct bio *bp2; 243 struct disk *dp; 244 struct g_disk_softc *sc; 245 246 /* See "notes" for why we need a mutex here */ 247 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 248 mtx_lock(&g_disk_done_mtx); 249 bp->bio_completed = bp->bio_length - bp->bio_resid; 250 251 bp2 = bp->bio_parent; 252 if (bp2->bio_error == 0) 253 bp2->bio_error = bp->bio_error; 254 bp2->bio_completed += bp->bio_completed; 255 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0 && 256 (sc = bp2->bio_to->geom->softc) != NULL && 257 (dp = sc->dp) != NULL) { 258 devstat_end_transaction_bio(dp->d_devstat, bp); 259 } 260 g_destroy_bio(bp); 261 bp2->bio_inbed++; 262 if (bp2->bio_children == bp2->bio_inbed) { 263 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 264 g_io_deliver(bp2, bp2->bio_error); 265 } 266 mtx_unlock(&g_disk_done_mtx); 267} 268 269static int 270g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 271{ 272 struct g_geom *gp; 273 struct disk *dp; 274 struct g_disk_softc *sc; 275 int error; 276 277 gp = pp->geom; 278 sc = gp->softc; 279 dp = sc->dp; 280 281 if (dp->d_ioctl == NULL) 282 return (ENOIOCTL); 283 g_disk_lock_giant(dp); 284 error = dp->d_ioctl(dp, cmd, data, fflag, td); 285 g_disk_unlock_giant(dp); 286 return (error); 287} 288 289static void 290g_disk_start(struct bio *bp) 291{ 292 struct bio *bp2, *bp3; 293 struct disk *dp; 294 struct g_disk_softc *sc; 295 int error; 296 off_t off; 297 298 sc = bp->bio_to->geom->softc; 299 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 300 g_io_deliver(bp, ENXIO); 301 return; 302 } 303 error = EJUSTRETURN; 304 switch(bp->bio_cmd) { 305 case BIO_DELETE: 306 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 307 error = EOPNOTSUPP; 308 break; 309 } 310 /* fall-through */ 311 case BIO_READ: 312 case BIO_WRITE: 313 off = 0; 314 bp3 = NULL; 315 bp2 = g_clone_bio(bp); 316 if (bp2 == NULL) { 317 error = ENOMEM; 318 break; 319 } 320 do { 321 bp2->bio_offset += off; 322 bp2->bio_length -= off; 323 bp2->bio_data += off; 324 if (bp2->bio_length > dp->d_maxsize) { 325 /* 326 * XXX: If we have a stripesize we should really 327 * use it here. 328 */ 329 bp2->bio_length = dp->d_maxsize; 330 off += dp->d_maxsize; 331 /* 332 * To avoid a race, we need to grab the next bio 333 * before we schedule this one. See "notes". 334 */ 335 bp3 = g_clone_bio(bp); 336 if (bp3 == NULL) 337 bp->bio_error = ENOMEM; 338 } 339 bp2->bio_done = g_disk_done; 340 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 341 bp2->bio_bcount = bp2->bio_length; 342 bp2->bio_disk = dp; 343 devstat_start_transaction_bio(dp->d_devstat, bp2); 344 g_disk_lock_giant(dp); 345 dp->d_strategy(bp2); 346 g_disk_unlock_giant(dp); 347 bp2 = bp3; 348 bp3 = NULL; 349 } while (bp2 != NULL); 350 break; 351 case BIO_GETATTR: 352 /* Give the driver a chance to override */ 353 if (dp->d_getattr != NULL) { 354 if (bp->bio_disk == NULL) 355 bp->bio_disk = dp; 356 error = dp->d_getattr(bp); 357 if (error != -1) 358 break; 359 error = EJUSTRETURN; 360 } 361 if (g_handleattr_int(bp, "GEOM::candelete", 362 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 363 break; 364 else if (g_handleattr_int(bp, "GEOM::fwsectors", 365 dp->d_fwsectors)) 366 break; 367 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 368 break; 369 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 370 break; 371 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 372 break; 373 else if (g_handleattr(bp, "GEOM::hba_vendor", 374 &dp->d_hba_vendor, 2)) 375 break; 376 else if (g_handleattr(bp, "GEOM::hba_device", 377 &dp->d_hba_device, 2)) 378 break; 379 else if (g_handleattr(bp, "GEOM::hba_subvendor", 380 &dp->d_hba_subvendor, 2)) 381 break; 382 else if (g_handleattr(bp, "GEOM::hba_subdevice", 383 &dp->d_hba_subdevice, 2)) 384 break; 385 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 386 g_disk_kerneldump(bp, dp); 387 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 388 g_disk_setstate(bp, sc); 389 else 390 error = ENOIOCTL; 391 break; 392 case BIO_FLUSH: 393 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 394 bp->bio_to->name); 395 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 396 error = EOPNOTSUPP; 397 break; 398 } 399 bp2 = g_clone_bio(bp); 400 if (bp2 == NULL) { 401 g_io_deliver(bp, ENOMEM); 402 return; 403 } 404 bp2->bio_done = g_disk_done; 405 bp2->bio_disk = dp; 406 g_disk_lock_giant(dp); 407 dp->d_strategy(bp2); 408 g_disk_unlock_giant(dp); 409 break; 410 default: 411 error = EOPNOTSUPP; 412 break; 413 } 414 if (error != EJUSTRETURN) 415 g_io_deliver(bp, error); 416 return; 417} 418 419static void 420g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 421{ 422 struct disk *dp; 423 struct g_disk_softc *sc; 424 425 sc = gp->softc; 426 if (sc == NULL || (dp = sc->dp) == NULL) 427 return; 428 if (indent == NULL) { 429 sbuf_printf(sb, " hd %u", dp->d_fwheads); 430 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 431 return; 432 } 433 if (pp != NULL) { 434 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 435 indent, dp->d_fwheads); 436 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 437 indent, dp->d_fwsectors); 438 sbuf_printf(sb, "%s<ident>%s</ident>\n", indent, dp->d_ident); 439 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr); 440 } 441} 442 443static void 444g_disk_resize(void *ptr, int flag) 445{ 446 struct disk *dp; 447 struct g_geom *gp; 448 struct g_provider *pp; 449 450 if (flag == EV_CANCEL) 451 return; 452 g_topology_assert(); 453 454 dp = ptr; 455 gp = dp->d_geom; 456 457 if (dp->d_destroyed || gp == NULL) 458 return; 459 460 LIST_FOREACH(pp, &gp->provider, provider) { 461 if (pp->sectorsize != 0 && 462 pp->sectorsize != dp->d_sectorsize) 463 g_wither_provider(pp, ENXIO); 464 else 465 g_resize_provider(pp, dp->d_mediasize); 466 } 467} 468 469static void 470g_disk_create(void *arg, int flag) 471{ 472 struct g_geom *gp; 473 struct g_provider *pp; 474 struct disk *dp; 475 struct g_disk_softc *sc; 476 char tmpstr[80]; 477 478 if (flag == EV_CANCEL) 479 return; 480 g_topology_assert(); 481 dp = arg; 482 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 483 sc->dp = dp; 484 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 485 gp->softc = sc; 486 pp = g_new_providerf(gp, "%s", gp->name); 487 pp->mediasize = dp->d_mediasize; 488 pp->sectorsize = dp->d_sectorsize; 489 pp->stripeoffset = dp->d_stripeoffset; 490 pp->stripesize = dp->d_stripesize; 491 if (bootverbose) 492 printf("GEOM: new disk %s\n", gp->name); 493 sysctl_ctx_init(&sc->sysctl_ctx); 494 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 495 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 496 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 497 CTLFLAG_RD, 0, tmpstr); 498 if (sc->sysctl_tree != NULL) { 499 snprintf(tmpstr, sizeof(tmpstr), 500 "kern.geom.disk.%s.led", gp->name); 501 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 502 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 503 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 504 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 505 "LED name"); 506 } 507 pp->private = sc; 508 dp->d_geom = gp; 509 g_error_provider(pp, 0); 510} 511 512/* 513 * We get this callback after all of the consumers have gone away, and just 514 * before the provider is freed. If the disk driver provided a d_gone 515 * callback, let them know that it is okay to free resources -- they won't 516 * be getting any more accesses from GEOM. 517 */ 518static void 519g_disk_providergone(struct g_provider *pp) 520{ 521 struct disk *dp; 522 struct g_disk_softc *sc; 523 524 sc = (struct g_disk_softc *)pp->geom->softc; 525 526 /* 527 * If the softc is already NULL, then we've probably been through 528 * g_disk_destroy already; there is nothing for us to do anyway. 529 */ 530 if (sc == NULL) 531 return; 532 533 dp = sc->dp; 534 535 if (dp->d_gone != NULL) 536 dp->d_gone(dp); 537} 538 539static void 540g_disk_destroy(void *ptr, int flag) 541{ 542 struct disk *dp; 543 struct g_geom *gp; 544 struct g_disk_softc *sc; 545 546 g_topology_assert(); 547 dp = ptr; 548 gp = dp->d_geom; 549 if (gp != NULL) { 550 sc = gp->softc; 551 if (sc->sysctl_tree != NULL) { 552 sysctl_ctx_free(&sc->sysctl_ctx); 553 sc->sysctl_tree = NULL; 554 } 555 if (sc->led[0] != 0) { 556 led_set(sc->led, "0"); 557 sc->led[0] = 0; 558 } 559 g_free(sc); 560 gp->softc = NULL; 561 g_wither_geom(gp, ENXIO); 562 } 563 g_free(dp); 564} 565 566/* 567 * We only allow printable characters in disk ident, 568 * the rest is converted to 'x<HH>'. 569 */ 570static void 571g_disk_ident_adjust(char *ident, size_t size) 572{ 573 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 574 575 newid[0] = '\0'; 576 for (p = ident; *p != '\0'; p++) { 577 if (isprint(*p)) { 578 tmp[0] = *p; 579 tmp[1] = '\0'; 580 } else { 581 snprintf(tmp, sizeof(tmp), "x%02hhx", 582 *(unsigned char *)p); 583 } 584 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 585 break; 586 } 587 bzero(ident, size); 588 strlcpy(ident, newid, size); 589} 590 591struct disk * 592disk_alloc(void) 593{ 594 595 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 596} 597 598void 599disk_create(struct disk *dp, int version) 600{ 601 602 if (version != DISK_VERSION_02) { 603 printf("WARNING: Attempt to add disk %s%d %s", 604 dp->d_name, dp->d_unit, 605 " using incompatible ABI version of disk(9)\n"); 606 printf("WARNING: Ignoring disk %s%d\n", 607 dp->d_name, dp->d_unit); 608 return; 609 } 610 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 611 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 612 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 613 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 614 if (dp->d_devstat == NULL) 615 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 616 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 617 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 618 dp->d_geom = NULL; 619 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 620 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 621} 622 623void 624disk_destroy(struct disk *dp) 625{ 626 627 g_cancel_event(dp); 628 dp->d_destroyed = 1; 629 if (dp->d_devstat != NULL) 630 devstat_remove_entry(dp->d_devstat); 631 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 632} 633 634void 635disk_gone(struct disk *dp) 636{ 637 struct g_geom *gp; 638 struct g_provider *pp; 639 640 gp = dp->d_geom; 641 if (gp != NULL) { 642 pp = LIST_FIRST(&gp->provider); 643 if (pp != NULL) { 644 KASSERT(LIST_NEXT(pp, provider) == NULL, 645 ("geom %p has more than one provider", gp)); 646 g_wither_provider(pp, ENXIO); 647 } 648 } 649} 650 651void 652disk_attr_changed(struct disk *dp, const char *attr, int flag) 653{ 654 struct g_geom *gp; 655 struct g_provider *pp; 656 657 gp = dp->d_geom; 658 if (gp != NULL) 659 LIST_FOREACH(pp, &gp->provider, provider) 660 (void)g_attr_changed(pp, attr, flag); 661} 662 663void 664disk_media_changed(struct disk *dp, int flag) 665{ 666 struct g_geom *gp; 667 struct g_provider *pp; 668 669 gp = dp->d_geom; 670 if (gp != NULL) { 671 LIST_FOREACH(pp, &gp->provider, provider) 672 g_media_changed(pp, flag); 673 } 674} 675 676void 677disk_media_gone(struct disk *dp, int flag) 678{ 679 struct g_geom *gp; 680 struct g_provider *pp; 681 682 gp = dp->d_geom; 683 if (gp != NULL) { 684 LIST_FOREACH(pp, &gp->provider, provider) 685 g_media_gone(pp, flag); 686 } 687} 688 689int 690disk_resize(struct disk *dp, int flag) 691{ 692 693 if (dp->d_destroyed || dp->d_geom == NULL) 694 return (0); 695 696 return (g_post_event(g_disk_resize, dp, flag, NULL)); 697} 698 699static void 700g_kern_disks(void *p, int flag __unused) 701{ 702 struct sbuf *sb; 703 struct g_geom *gp; 704 char *sp; 705 706 sb = p; 707 sp = ""; 708 g_topology_assert(); 709 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 710 sbuf_printf(sb, "%s%s", sp, gp->name); 711 sp = " "; 712 } 713 sbuf_finish(sb); 714} 715 716static int 717sysctl_disks(SYSCTL_HANDLER_ARGS) 718{ 719 int error; 720 struct sbuf *sb; 721 722 sb = sbuf_new_auto(); 723 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 724 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 725 sbuf_delete(sb); 726 return error; 727} 728 729SYSCTL_PROC(_kern, OID_AUTO, disks, 730 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 731 sysctl_disks, "A", "names of available disks"); 732