geom_disk.c revision 249507
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 249507 2013-04-15 15:55:40Z ivoras $"); 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 mtx done_mtx; 64 struct disk *dp; 65 struct sysctl_ctx_list sysctl_ctx; 66 struct sysctl_oid *sysctl_tree; 67 char led[64]; 68 uint32_t state; 69}; 70 71static g_access_t g_disk_access; 72static g_start_t g_disk_start; 73static g_ioctl_t g_disk_ioctl; 74static g_dumpconf_t g_disk_dumpconf; 75static g_provgone_t g_disk_providergone; 76 77static 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 87SYSCTL_DECL(_kern_geom); 88static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 89 "GEOM_DISK stuff"); 90 91DECLARE_GEOM_CLASS(g_disk_class, g_disk); 92 93static void __inline 94g_disk_lock_giant(struct disk *dp) 95{ 96 97 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 98 mtx_lock(&Giant); 99} 100 101static void __inline 102g_disk_unlock_giant(struct disk *dp) 103{ 104 105 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 106 mtx_unlock(&Giant); 107} 108 109static int 110g_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 } 142 pp->mediasize = dp->d_mediasize; 143 pp->sectorsize = dp->d_sectorsize; 144 pp->stripeoffset = dp->d_stripeoffset; 145 pp->stripesize = dp->d_stripesize; 146 dp->d_flags |= DISKFLAG_OPEN; 147 if (dp->d_maxsize == 0) { 148 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 149 dp->d_name, dp->d_unit); 150 dp->d_maxsize = DFLTPHYS; 151 } 152 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 153 if (dp->d_close != NULL) { 154 g_disk_lock_giant(dp); 155 error = dp->d_close(dp); 156 if (error != 0) 157 printf("Closed disk %s -> %d\n", 158 pp->name, error); 159 g_disk_unlock_giant(dp); 160 } 161 sc->state = G_STATE_ACTIVE; 162 if (sc->led[0] != 0) 163 led_set(sc->led, "0"); 164 dp->d_flags &= ~DISKFLAG_OPEN; 165 } 166 return (error); 167} 168 169static void 170g_disk_kerneldump(struct bio *bp, struct disk *dp) 171{ 172 struct g_kerneldump *gkd; 173 struct g_geom *gp; 174 175 gkd = (struct g_kerneldump*)bp->bio_data; 176 gp = bp->bio_to->geom; 177 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 178 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 179 if (dp->d_dump == NULL) { 180 g_io_deliver(bp, ENODEV); 181 return; 182 } 183 gkd->di.dumper = dp->d_dump; 184 gkd->di.priv = dp; 185 gkd->di.blocksize = dp->d_sectorsize; 186 gkd->di.maxiosize = dp->d_maxsize; 187 gkd->di.mediaoffset = gkd->offset; 188 if ((gkd->offset + gkd->length) > dp->d_mediasize) 189 gkd->length = dp->d_mediasize - gkd->offset; 190 gkd->di.mediasize = gkd->length; 191 g_io_deliver(bp, 0); 192} 193 194static void 195g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 196{ 197 const char *cmd; 198 199 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 200 if (sc->led[0] != 0) { 201 switch (sc->state) { 202 case G_STATE_FAILED: 203 cmd = "1"; 204 break; 205 case G_STATE_REBUILD: 206 cmd = "f5"; 207 break; 208 case G_STATE_RESYNC: 209 cmd = "f1"; 210 break; 211 default: 212 cmd = "0"; 213 break; 214 } 215 led_set(sc->led, cmd); 216 } 217 g_io_deliver(bp, 0); 218} 219 220static void 221g_disk_done(struct bio *bp) 222{ 223 struct bio *bp2; 224 struct g_disk_softc *sc; 225 226 /* See "notes" for why we need a mutex here */ 227 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 228 bp2 = bp->bio_parent; 229 sc = bp2->bio_to->private; 230 bp->bio_completed = bp->bio_length - bp->bio_resid; 231 mtx_lock(&sc->done_mtx); 232 if (bp2->bio_error == 0) 233 bp2->bio_error = bp->bio_error; 234 bp2->bio_completed += bp->bio_completed; 235 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0) 236 devstat_end_transaction_bio(sc->dp->d_devstat, bp); 237 g_destroy_bio(bp); 238 bp2->bio_inbed++; 239 if (bp2->bio_children == bp2->bio_inbed) { 240 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 241 g_io_deliver(bp2, bp2->bio_error); 242 } 243 mtx_unlock(&sc->done_mtx); 244} 245 246static int 247g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 248{ 249 struct disk *dp; 250 struct g_disk_softc *sc; 251 int error; 252 253 sc = pp->private; 254 dp = sc->dp; 255 256 if (dp->d_ioctl == NULL) 257 return (ENOIOCTL); 258 g_disk_lock_giant(dp); 259 error = dp->d_ioctl(dp, cmd, data, fflag, td); 260 g_disk_unlock_giant(dp); 261 return (error); 262} 263 264static void 265g_disk_start(struct bio *bp) 266{ 267 struct bio *bp2, *bp3; 268 struct disk *dp; 269 struct g_disk_softc *sc; 270 int error; 271 off_t off; 272 273 sc = bp->bio_to->private; 274 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 275 g_io_deliver(bp, ENXIO); 276 return; 277 } 278 error = EJUSTRETURN; 279 switch(bp->bio_cmd) { 280 case BIO_DELETE: 281 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 282 error = EOPNOTSUPP; 283 break; 284 } 285 /* fall-through */ 286 case BIO_READ: 287 case BIO_WRITE: 288 off = 0; 289 bp3 = NULL; 290 bp2 = g_clone_bio(bp); 291 if (bp2 == NULL) { 292 error = ENOMEM; 293 break; 294 } 295 do { 296 bp2->bio_offset += off; 297 bp2->bio_length -= off; 298 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 299 bp2->bio_data += off; 300 } else { 301 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) 302 != 0, 303 ("unmapped bio not supported by disk %s", 304 dp->d_name)); 305 bp2->bio_ma += off / PAGE_SIZE; 306 bp2->bio_ma_offset += off; 307 bp2->bio_ma_offset %= PAGE_SIZE; 308 bp2->bio_ma_n -= off / PAGE_SIZE; 309 } 310 if (bp2->bio_length > dp->d_maxsize) { 311 /* 312 * XXX: If we have a stripesize we should really 313 * use it here. 314 */ 315 bp2->bio_length = dp->d_maxsize; 316 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 317 bp2->bio_ma_n = howmany( 318 bp2->bio_ma_offset + 319 bp2->bio_length, PAGE_SIZE); 320 } 321 off += dp->d_maxsize; 322 /* 323 * To avoid a race, we need to grab the next bio 324 * before we schedule this one. See "notes". 325 */ 326 bp3 = g_clone_bio(bp); 327 if (bp3 == NULL) 328 bp->bio_error = ENOMEM; 329 } 330 bp2->bio_done = g_disk_done; 331 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 332 bp2->bio_bcount = bp2->bio_length; 333 bp2->bio_disk = dp; 334 devstat_start_transaction_bio(dp->d_devstat, bp2); 335 g_disk_lock_giant(dp); 336 dp->d_strategy(bp2); 337 g_disk_unlock_giant(dp); 338 bp2 = bp3; 339 bp3 = NULL; 340 } while (bp2 != NULL); 341 break; 342 case BIO_GETATTR: 343 /* Give the driver a chance to override */ 344 if (dp->d_getattr != NULL) { 345 if (bp->bio_disk == NULL) 346 bp->bio_disk = dp; 347 error = dp->d_getattr(bp); 348 if (error != -1) 349 break; 350 error = EJUSTRETURN; 351 } 352 if (g_handleattr_int(bp, "GEOM::candelete", 353 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 354 break; 355 else if (g_handleattr_int(bp, "GEOM::fwsectors", 356 dp->d_fwsectors)) 357 break; 358 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 359 break; 360 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 361 break; 362 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 363 break; 364 else if (g_handleattr(bp, "GEOM::hba_vendor", 365 &dp->d_hba_vendor, 2)) 366 break; 367 else if (g_handleattr(bp, "GEOM::hba_device", 368 &dp->d_hba_device, 2)) 369 break; 370 else if (g_handleattr(bp, "GEOM::hba_subvendor", 371 &dp->d_hba_subvendor, 2)) 372 break; 373 else if (g_handleattr(bp, "GEOM::hba_subdevice", 374 &dp->d_hba_subdevice, 2)) 375 break; 376 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 377 g_disk_kerneldump(bp, dp); 378 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 379 g_disk_setstate(bp, sc); 380 else 381 error = ENOIOCTL; 382 break; 383 case BIO_FLUSH: 384 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 385 bp->bio_to->name); 386 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 387 error = EOPNOTSUPP; 388 break; 389 } 390 bp2 = g_clone_bio(bp); 391 if (bp2 == NULL) { 392 g_io_deliver(bp, ENOMEM); 393 return; 394 } 395 bp2->bio_done = g_disk_done; 396 bp2->bio_disk = dp; 397 g_disk_lock_giant(dp); 398 dp->d_strategy(bp2); 399 g_disk_unlock_giant(dp); 400 break; 401 default: 402 error = EOPNOTSUPP; 403 break; 404 } 405 if (error != EJUSTRETURN) 406 g_io_deliver(bp, error); 407 return; 408} 409 410static void 411g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 412{ 413 struct disk *dp; 414 struct g_disk_softc *sc; 415 416 sc = gp->softc; 417 if (sc == NULL || (dp = sc->dp) == NULL) 418 return; 419 if (indent == NULL) { 420 sbuf_printf(sb, " hd %u", dp->d_fwheads); 421 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 422 return; 423 } 424 if (pp != NULL) { 425 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 426 indent, dp->d_fwheads); 427 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 428 indent, dp->d_fwsectors); 429 sbuf_printf(sb, "%s<ident>%s</ident>\n", indent, dp->d_ident); 430 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr); 431 } 432} 433 434static void 435g_disk_resize(void *ptr, int flag) 436{ 437 struct disk *dp; 438 struct g_geom *gp; 439 struct g_provider *pp; 440 441 if (flag == EV_CANCEL) 442 return; 443 g_topology_assert(); 444 445 dp = ptr; 446 gp = dp->d_geom; 447 448 if (dp->d_destroyed || gp == NULL) 449 return; 450 451 LIST_FOREACH(pp, &gp->provider, provider) { 452 if (pp->sectorsize != 0 && 453 pp->sectorsize != dp->d_sectorsize) 454 g_wither_provider(pp, ENXIO); 455 else 456 g_resize_provider(pp, dp->d_mediasize); 457 } 458} 459 460static void 461g_disk_create(void *arg, int flag) 462{ 463 struct g_geom *gp; 464 struct g_provider *pp; 465 struct disk *dp; 466 struct g_disk_softc *sc; 467 char tmpstr[80]; 468 469 if (flag == EV_CANCEL) 470 return; 471 g_topology_assert(); 472 dp = arg; 473 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 474 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 475 sc->dp = dp; 476 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 477 gp->softc = sc; 478 pp = g_new_providerf(gp, "%s", gp->name); 479 pp->mediasize = dp->d_mediasize; 480 pp->sectorsize = dp->d_sectorsize; 481 pp->stripeoffset = dp->d_stripeoffset; 482 pp->stripesize = dp->d_stripesize; 483 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 484 pp->flags |= G_PF_ACCEPT_UNMAPPED; 485 if (bootverbose) 486 printf("GEOM: new disk %s\n", gp->name); 487 sysctl_ctx_init(&sc->sysctl_ctx); 488 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 489 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 490 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 491 CTLFLAG_RD, 0, tmpstr); 492 if (sc->sysctl_tree != NULL) { 493 snprintf(tmpstr, sizeof(tmpstr), 494 "kern.geom.disk.%s.led", gp->name); 495 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 496 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 497 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 498 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 499 "LED name"); 500 } 501 pp->private = sc; 502 dp->d_geom = gp; 503 g_error_provider(pp, 0); 504} 505 506/* 507 * We get this callback after all of the consumers have gone away, and just 508 * before the provider is freed. If the disk driver provided a d_gone 509 * callback, let them know that it is okay to free resources -- they won't 510 * be getting any more accesses from GEOM. 511 */ 512static void 513g_disk_providergone(struct g_provider *pp) 514{ 515 struct disk *dp; 516 struct g_disk_softc *sc; 517 518 sc = (struct g_disk_softc *)pp->private; 519 dp = sc->dp; 520 if (dp != NULL && dp->d_gone != NULL) 521 dp->d_gone(dp); 522 if (sc->sysctl_tree != NULL) { 523 sysctl_ctx_free(&sc->sysctl_ctx); 524 sc->sysctl_tree = NULL; 525 } 526 if (sc->led[0] != 0) { 527 led_set(sc->led, "0"); 528 sc->led[0] = 0; 529 } 530 pp->private = NULL; 531 pp->geom->softc = NULL; 532 mtx_destroy(&sc->done_mtx); 533 g_free(sc); 534} 535 536static void 537g_disk_destroy(void *ptr, int flag) 538{ 539 struct disk *dp; 540 struct g_geom *gp; 541 struct g_disk_softc *sc; 542 543 g_topology_assert(); 544 dp = ptr; 545 gp = dp->d_geom; 546 if (gp != NULL) { 547 sc = gp->softc; 548 if (sc != NULL) 549 sc->dp = NULL; 550 dp->d_geom = NULL; 551 g_wither_geom(gp, ENXIO); 552 } 553 g_free(dp); 554} 555 556/* 557 * We only allow printable characters in disk ident, 558 * the rest is converted to 'x<HH>'. 559 */ 560static void 561g_disk_ident_adjust(char *ident, size_t size) 562{ 563 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 564 565 newid[0] = '\0'; 566 for (p = ident; *p != '\0'; p++) { 567 if (isprint(*p)) { 568 tmp[0] = *p; 569 tmp[1] = '\0'; 570 } else { 571 snprintf(tmp, sizeof(tmp), "x%02hhx", 572 *(unsigned char *)p); 573 } 574 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 575 break; 576 } 577 bzero(ident, size); 578 strlcpy(ident, newid, size); 579} 580 581struct disk * 582disk_alloc(void) 583{ 584 585 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 586} 587 588void 589disk_create(struct disk *dp, int version) 590{ 591 592 if (version != DISK_VERSION_02) { 593 printf("WARNING: Attempt to add disk %s%d %s", 594 dp->d_name, dp->d_unit, 595 " using incompatible ABI version of disk(9)\n"); 596 printf("WARNING: Ignoring disk %s%d\n", 597 dp->d_name, dp->d_unit); 598 return; 599 } 600 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 601 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 602 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 603 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 604 if (dp->d_devstat == NULL) 605 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 606 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 607 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 608 dp->d_geom = NULL; 609 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 610 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 611} 612 613void 614disk_destroy(struct disk *dp) 615{ 616 617 g_cancel_event(dp); 618 dp->d_destroyed = 1; 619 if (dp->d_devstat != NULL) 620 devstat_remove_entry(dp->d_devstat); 621 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 622} 623 624void 625disk_gone(struct disk *dp) 626{ 627 struct g_geom *gp; 628 struct g_provider *pp; 629 630 gp = dp->d_geom; 631 if (gp != NULL) { 632 pp = LIST_FIRST(&gp->provider); 633 if (pp != NULL) { 634 KASSERT(LIST_NEXT(pp, provider) == NULL, 635 ("geom %p has more than one provider", gp)); 636 g_wither_provider(pp, ENXIO); 637 } 638 } 639} 640 641void 642disk_attr_changed(struct disk *dp, const char *attr, int flag) 643{ 644 struct g_geom *gp; 645 struct g_provider *pp; 646 647 gp = dp->d_geom; 648 if (gp != NULL) 649 LIST_FOREACH(pp, &gp->provider, provider) 650 (void)g_attr_changed(pp, attr, flag); 651} 652 653void 654disk_media_changed(struct disk *dp, int flag) 655{ 656 struct g_geom *gp; 657 struct g_provider *pp; 658 659 gp = dp->d_geom; 660 if (gp != NULL) { 661 pp = LIST_FIRST(&gp->provider); 662 if (pp != NULL) { 663 KASSERT(LIST_NEXT(pp, provider) == NULL, 664 ("geom %p has more than one provider", gp)); 665 g_media_changed(pp, flag); 666 } 667 } 668} 669 670void 671disk_media_gone(struct disk *dp, int flag) 672{ 673 struct g_geom *gp; 674 struct g_provider *pp; 675 676 gp = dp->d_geom; 677 if (gp != NULL) { 678 pp = LIST_FIRST(&gp->provider); 679 if (pp != NULL) { 680 KASSERT(LIST_NEXT(pp, provider) == NULL, 681 ("geom %p has more than one provider", gp)); 682 g_media_gone(pp, flag); 683 } 684 } 685} 686 687int 688disk_resize(struct disk *dp, int flag) 689{ 690 691 if (dp->d_destroyed || dp->d_geom == NULL) 692 return (0); 693 694 return (g_post_event(g_disk_resize, dp, flag, NULL)); 695} 696 697static void 698g_kern_disks(void *p, int flag __unused) 699{ 700 struct sbuf *sb; 701 struct g_geom *gp; 702 char *sp; 703 704 sb = p; 705 sp = ""; 706 g_topology_assert(); 707 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 708 sbuf_printf(sb, "%s%s", sp, gp->name); 709 sp = " "; 710 } 711 sbuf_finish(sb); 712} 713 714static int 715sysctl_disks(SYSCTL_HANDLER_ARGS) 716{ 717 int error; 718 struct sbuf *sb; 719 720 sb = sbuf_new_auto(); 721 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 722 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 723 sbuf_delete(sb); 724 return error; 725} 726 727SYSCTL_PROC(_kern, OID_AUTO, disks, 728 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 729 sysctl_disks, "A", "names of available disks"); 730