sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
  23  * All rights reserved.
  24  *
  25  * Portions Copyright (c) 2012 Martin Matuska <mm@FreeBSD.org>
  26  */
  27
  28 #include <sys/zfs_context.h>
  29 #include <sys/param.h>
  30 #include <sys/kernel.h>
  31 #include <sys/bio.h>
  32 #include <sys/disk.h>
  33 #include <sys/spa.h>
  34 #include <sys/spa_impl.h>
  35 #include <sys/vdev_impl.h>
  36 #include <sys/fs/zfs.h>
  37 #include <sys/zio.h>
  38 #include <geom/geom.h>
  39 #include <geom/geom_int.h>
  40
  41 /*
  42  * Virtual device vector for GEOM.
  43  */
  44
  45 struct g_class zfs_vdev_class = {
  46         .name = "ZFS::VDEV",
  47         .version = G_VERSION,
  48 };
  49
  50 DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
  51
  52 SYSCTL_DECL(_vfs_zfs_vdev);
  53 /* Don't send BIO_FLUSH. */
  54 static int vdev_geom_bio_flush_disable = 0;
  55 TUNABLE_INT("vfs.zfs.vdev.bio_flush_disable", &vdev_geom_bio_flush_disable);
  56 SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RW,
  57     &vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
  58 /* Don't send BIO_DELETE. */
  59 static int vdev_geom_bio_delete_disable = 0;
  60 TUNABLE_INT("vfs.zfs.vdev.bio_delete_disable", &vdev_geom_bio_delete_disable);
  61 SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_delete_disable, CTLFLAG_RW,
  62     &vdev_geom_bio_delete_disable, 0, "Disable BIO_DELETE");
  63
  64 static void
  65 vdev_geom_orphan(struct g_consumer *cp)
  66 {
  67         vdev_t *vd;
  68
  69         g_topology_assert();
  70
  71         vd = cp->private;
  72
  73         /*
  74          * Orphan callbacks occur from the GEOM event thread.
  75          * Concurrent with this call, new I/O requests may be
  76          * working their way through GEOM about to find out
  77          * (only once executed by the g_down thread) that we've
  78          * been orphaned from our disk provider.  These I/Os
  79          * must be retired before we can detach our consumer.
  80          * This is most easily achieved by acquiring the
  81          * SPA ZIO configuration lock as a writer, but doing
  82          * so with the GEOM topology lock held would cause
  83          * a lock order reversal.  Instead, rely on the SPA's
  84          * async removal support to invoke a close on this
  85          * vdev once it is safe to do so.
  86          */
  87         zfs_post_remove(vd->vdev_spa, vd);
  88         vd->vdev_remove_wanted = B_TRUE;
  89         spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
  90 }
  91
  92 static struct g_consumer *
  93 vdev_geom_attach(struct g_provider *pp)
  94 {
  95         struct g_geom *gp;
  96         struct g_consumer *cp;
  97
  98         g_topology_assert();
  99
 100         ZFS_LOG(1, "Attaching to %s.", pp->name);
 101         /* Do we have geom already? No? Create one. */
 102         LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
 103                 if (gp->flags & G_GEOM_WITHER)
 104                         continue;
 105                 if (strcmp(gp->name, "zfs::vdev") != 0)
 106                         continue;
 107                 break;
 108         }
 109         if (gp == NULL) {
 110                 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
 111                 gp->orphan = vdev_geom_orphan;
 112                 cp = g_new_consumer(gp);
 113                 if (g_attach(cp, pp) != 0) {
 114                         g_wither_geom(gp, ENXIO);
 115                         return (NULL);
 116                 }
 117                 if (g_access(cp, 1, 0, 1) != 0) {
 118                         g_wither_geom(gp, ENXIO);
 119                         return (NULL);
 120                 }
 121                 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
 122         } else {
 123                 /* Check if we are already connected to this provider. */
 124                 LIST_FOREACH(cp, &gp->consumer, consumer) {
 125                         if (cp->provider == pp) {
 126                                 ZFS_LOG(1, "Found consumer for %s.", pp->name);
 127                                 break;
 128                         }
 129                 }
 130                 if (cp == NULL) {
 131                         cp = g_new_consumer(gp);
 132                         if (g_attach(cp, pp) != 0) {
 133                                 g_destroy_consumer(cp);
 134                                 return (NULL);
 135                         }
 136                         if (g_access(cp, 1, 0, 1) != 0) {
 137                                 g_detach(cp);
 138                                 g_destroy_consumer(cp);
 139                                 return (NULL);
 140                         }
 141                         ZFS_LOG(1, "Created consumer for %s.", pp->name);
 142                 } else {
 143                         if (g_access(cp, 1, 0, 1) != 0)
 144                                 return (NULL);
 145                         ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
 146                 }
 147         }
 148         return (cp);
 149 }
 150
 151 static void
 152 vdev_geom_detach(void *arg, int flag __unused)
 153 {
 154         struct g_geom *gp;
 155         struct g_consumer *cp;
 156
 157         g_topology_assert();
 158         cp = arg;
 159         gp = cp->geom;
 160
 161         ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
 162         g_access(cp, -1, 0, -1);
 163         /* Destroy consumer on last close. */
 164         if (cp->acr == 0 && cp->ace == 0) {
 165                 ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
 166                 if (cp->acw > 0)
 167                         g_access(cp, 0, -cp->acw, 0);
 168                 g_detach(cp);
 169                 g_destroy_consumer(cp);
 170         }
 171         /* Destroy geom if there are no consumers left. */
 172         if (LIST_EMPTY(&gp->consumer)) {
 173                 ZFS_LOG(1, "Destroyed geom %s.", gp->name);
 174                 g_wither_geom(gp, ENXIO);
 175         }
 176 }
 177
 178 static uint64_t
 179 nvlist_get_guid(nvlist_t *list)
 180 {
 181         nvpair_t *elem = NULL;
 182         uint64_t value;
 183
 184         while ((elem = nvlist_next_nvpair(list, elem)) != NULL) {
 185                 if (nvpair_type(elem) == DATA_TYPE_UINT64 &&
 186                     strcmp(nvpair_name(elem), "guid") == 0) {
 187                         VERIFY(nvpair_value_uint64(elem, &value) == 0);
 188                         return (value);
 189                 }
 190         }
 191         return (0);
 192 }
 193
 194 static int
 195 vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size)
 196 {
 197         struct bio *bp;
 198         u_char *p;
 199         off_t off, maxio;
 200         int error;
 201
 202         ASSERT((offset % cp->provider->sectorsize) == 0);
 203         ASSERT((size % cp->provider->sectorsize) == 0);
 204
 205         bp = g_alloc_bio();
 206         off = offset;
 207         offset += size;
 208         p = data;
 209         maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
 210         error = 0;
 211
 212         for (; off < offset; off += maxio, p += maxio, size -= maxio) {
 213                 bzero(bp, sizeof(*bp));
 214                 bp->bio_cmd = cmd;
 215                 bp->bio_done = NULL;
 216                 bp->bio_offset = off;
 217                 bp->bio_length = MIN(size, maxio);
 218                 bp->bio_data = p;
 219                 g_io_request(bp, cp);
 220                 error = biowait(bp, "vdev_geom_io");
 221                 if (error != 0)
 222                         break;
 223         }
 224
 225         g_destroy_bio(bp);
 226         return (error);
 227 }
 228
 229 static uint64_t
 230 vdev_geom_read_guid(struct g_consumer *cp)
 231 {
 232         struct g_provider *pp;
 233         vdev_label_t *label;
 234         char *p, *buf;
 235         size_t buflen;
 236         uint64_t psize;
 237         off_t offset, size;
 238         uint64_t guid;
 239         int error, l, len;
 240
 241         g_topology_assert_not();
 242
 243         pp = cp->provider;
 244         ZFS_LOG(1, "Reading guid from %s...", pp->name);
 245
 246         psize = pp->mediasize;
 247         psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
 248
 249         size = sizeof(*label) + pp->sectorsize -
 250             ((sizeof(*label) - 1) % pp->sectorsize) - 1;
 251
 252         guid = 0;
 253         label = kmem_alloc(size, KM_SLEEP);
 254         buflen = sizeof(label->vl_vdev_phys.vp_nvlist);
 255
 256         for (l = 0; l < VDEV_LABELS; l++) {
 257                 nvlist_t *config = NULL;
 258
 259                 offset = vdev_label_offset(psize, l, 0);
 260                 if ((offset % pp->sectorsize) != 0)
 261                         continue;
 262
 263                 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0)
 264                         continue;
 265                 buf = label->vl_vdev_phys.vp_nvlist;
 266
 267                 if (nvlist_unpack(buf, buflen, &config, 0) != 0)
 268                         continue;
 269
 270                 guid = nvlist_get_guid(config);
 271                 nvlist_free(config);
 272                 if (guid != 0)
 273                         break;
 274         }
 275
 276         kmem_free(label, size);
 277         if (guid != 0)
 278                 ZFS_LOG(1, "guid for %s is %ju", pp->name, (uintmax_t)guid);
 279         return (guid);
 280 }
 281
 282 static void
 283 vdev_geom_taste_orphan(struct g_consumer *cp)
 284 {
 285
 286         KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
 287             cp->provider->name));
 288 }
 289
 290 static struct g_consumer *
 291 vdev_geom_attach_by_guid(uint64_t guid)
 292 {
 293         struct g_class *mp;
 294         struct g_geom *gp, *zgp;
 295         struct g_provider *pp;
 296         struct g_consumer *cp, *zcp;
 297         uint64_t pguid;
 298
 299         g_topology_assert();
 300
 301         zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
 302         /* This orphan function should be never called. */
 303         zgp->orphan = vdev_geom_taste_orphan;
 304         zcp = g_new_consumer(zgp);
 305
 306         cp = NULL;
 307         LIST_FOREACH(mp, &g_classes, class) {
 308                 if (mp == &zfs_vdev_class)
 309                         continue;
 310                 LIST_FOREACH(gp, &mp->geom, geom) {
 311                         if (gp->flags & G_GEOM_WITHER)
 312                                 continue;
 313                         LIST_FOREACH(pp, &gp->provider, provider) {
 314                                 if (pp->flags & G_PF_WITHER)
 315                                         continue;
 316                                 g_attach(zcp, pp);
 317                                 if (g_access(zcp, 1, 0, 0) != 0) {
 318                                         g_detach(zcp);
 319                                         continue;
 320                                 }
 321                                 g_topology_unlock();
 322                                 pguid = vdev_geom_read_guid(zcp);
 323                                 g_topology_lock();
 324                                 g_access(zcp, -1, 0, 0);
 325                                 g_detach(zcp);
 326                                 if (pguid != guid)
 327                                         continue;
 328                                 cp = vdev_geom_attach(pp);
 329                                 if (cp == NULL) {
 330                                         printf("ZFS WARNING: Unable to attach to %s.\n",
 331                                             pp->name);
 332                                         continue;
 333                                 }
 334                                 break;
 335                         }
 336                         if (cp != NULL)
 337                                 break;
 338                 }
 339                 if (cp != NULL)
 340                         break;
 341         }
 342 end:
 343         g_destroy_consumer(zcp);
 344         g_destroy_geom(zgp);
 345         return (cp);
 346 }
 347
 348 static struct g_consumer *
 349 vdev_geom_open_by_guid(vdev_t *vd)
 350 {
 351         struct g_consumer *cp;
 352         char *buf;
 353         size_t len;
 354
 355         g_topology_assert();
 356
 357         ZFS_LOG(1, "Searching by guid [%ju].", (uintmax_t)vd->vdev_guid);
 358         cp = vdev_geom_attach_by_guid(vd->vdev_guid);
 359         if (cp != NULL) {
 360                 len = strlen(cp->provider->name) + strlen("/dev/") + 1;
 361                 buf = kmem_alloc(len, KM_SLEEP);
 362
 363                 snprintf(buf, len, "/dev/%s", cp->provider->name);
 364                 spa_strfree(vd->vdev_path);
 365                 vd->vdev_path = buf;
 366
 367                 ZFS_LOG(1, "Attach by guid [%ju] succeeded, provider %s.",
 368                     (uintmax_t)vd->vdev_guid, vd->vdev_path);
 369         } else {
 370                 ZFS_LOG(1, "Search by guid [%ju] failed.",
 371                     (uintmax_t)vd->vdev_guid);
 372         }
 373
 374         return (cp);
 375 }
 376
 377 static struct g_consumer *
 378 vdev_geom_open_by_path(vdev_t *vd, int check_guid)
 379 {
 380         struct g_provider *pp;
 381         struct g_consumer *cp;
 382         uint64_t guid;
 383
 384         g_topology_assert();
 385
 386         cp = NULL;
 387         pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
 388         if (pp != NULL) {
 389                 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
 390                 cp = vdev_geom_attach(pp);
 391                 if (cp != NULL && check_guid && ISP2(pp->sectorsize) &&
 392                     pp->sectorsize <= VDEV_PAD_SIZE) {
 393                         g_topology_unlock();
 394                         guid = vdev_geom_read_guid(cp);
 395                         g_topology_lock();
 396                         if (guid != vd->vdev_guid) {
 397                                 vdev_geom_detach(cp, 0);
 398                                 cp = NULL;
 399                                 ZFS_LOG(1, "guid mismatch for provider %s: "
 400                                     "%ju != %ju.", vd->vdev_path,
 401                                     (uintmax_t)vd->vdev_guid, (uintmax_t)guid);
 402                         } else {
 403                                 ZFS_LOG(1, "guid match for provider %s.",
 404                                     vd->vdev_path);
 405                         }
 406                 }
 407         }
 408
 409         return (cp);
 410 }
 411
 412 static int
 413 vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
 414     uint64_t *ashift)
 415 {
 416         struct g_provider *pp;
 417         struct g_consumer *cp;
 418         size_t bufsize;
 419         int error;
 420
 421         /*
 422          * We must have a pathname, and it must be absolute.
 423          */
 424         if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
 425                 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
 426                 return (EINVAL);
 427         }
 428
 429         vd->vdev_tsd = NULL;
 430
 431         DROP_GIANT();
 432         g_topology_lock();
 433         error = 0;
 434
 435         /*
 436          * If we're creating or splitting a pool, just find the GEOM provider
 437          * by its name and ignore GUID mismatches.
 438          */
 439         if (vd->vdev_spa->spa_load_state == SPA_LOAD_NONE ||
 440             vd->vdev_spa->spa_splitting_newspa == B_TRUE)
 441                 cp = vdev_geom_open_by_path(vd, 0);
 442         else {
 443                 cp = vdev_geom_open_by_path(vd, 1);
 444                 if (cp == NULL) {
 445                         /*
 446                          * The device at vd->vdev_path doesn't have the
 447                          * expected guid. The disks might have merely
 448                          * moved around so try all other GEOM providers
 449                          * to find one with the right guid.
 450                          */
 451                         cp = vdev_geom_open_by_guid(vd);
 452                 }
 453         }
 454
 455         if (cp == NULL) {
 456                 ZFS_LOG(1, "Provider %s not found.", vd->vdev_path);
 457                 error = ENOENT;
 458         } else if (cp->provider->sectorsize > VDEV_PAD_SIZE ||
 459             !ISP2(cp->provider->sectorsize)) {
 460                 ZFS_LOG(1, "Provider %s has unsupported sectorsize.",
 461                     vd->vdev_path);
 462                 vdev_geom_detach(cp, 0);
 463                 error = EINVAL;
 464                 cp = NULL;
 465         } else if (cp->acw == 0 && (spa_mode(vd->vdev_spa) & FWRITE) != 0) {
 466                 int i;
 467
 468                 for (i = 0; i < 5; i++) {
 469                         error = g_access(cp, 0, 1, 0);
 470                         if (error == 0)
 471                                 break;
 472                         g_topology_unlock();
 473                         tsleep(vd, 0, "vdev", hz / 2);
 474                         g_topology_lock();
 475                 }
 476                 if (error != 0) {
 477                         printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n",
 478                             vd->vdev_path, error);
 479                         vdev_geom_detach(cp, 0);
 480                         cp = NULL;
 481                 }
 482         }
 483         g_topology_unlock();
 484         PICKUP_GIANT();
 485         if (cp == NULL) {
 486                 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
 487                 return (error);
 488         }
 489
 490         cp->private = vd;
 491         vd->vdev_tsd = cp;
 492         pp = cp->provider;
 493
 494         /*
 495          * Determine the actual size of the device.
 496          */
 497         *max_psize = *psize = pp->mediasize;
 498
 499         /*
 500          * Determine the device's minimum transfer size.
 501          */
 502         *ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
 503
 504         /*
 505          * Clear the nowritecache settings, so that on a vdev_reopen()
 506          * we will try again.
 507          */
 508         vd->vdev_nowritecache = B_FALSE;
 509
 510         if (vd->vdev_physpath != NULL)
 511                 spa_strfree(vd->vdev_physpath);
 512         bufsize = sizeof("/dev/") + strlen(pp->name);
 513         vd->vdev_physpath = kmem_alloc(bufsize, KM_SLEEP);
 514         snprintf(vd->vdev_physpath, bufsize, "/dev/%s", pp->name);
 515
 516         return (0);
 517 }
 518
 519 static void
 520 vdev_geom_close(vdev_t *vd)
 521 {
 522         struct g_consumer *cp;
 523
 524         cp = vd->vdev_tsd;
 525         if (cp == NULL)
 526                 return;
 527         vd->vdev_tsd = NULL;
 528         vd->vdev_delayed_close = B_FALSE;
 529         g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
 530 }
 531
 532 static void
 533 vdev_geom_io_intr(struct bio *bp)
 534 {
 535         vdev_t *vd;
 536         zio_t *zio;
 537
 538         zio = bp->bio_caller1;
 539         vd = zio->io_vd;
 540         zio->io_error = bp->bio_error;
 541         if (zio->io_error == 0 && bp->bio_resid != 0)
 542                 zio->io_error = EIO;
 543         if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == ENOTSUP) {
 544                 /*
 545                  * If we get ENOTSUP, we know that no future
 546                  * attempts will ever succeed.  In this case we
 547                  * set a persistent bit so that we don't bother
 548                  * with the ioctl in the future.
 549                  */
 550                 vd->vdev_nowritecache = B_TRUE;
 551         }
 552         if (bp->bio_cmd == BIO_DELETE && bp->bio_error == ENOTSUP) {
 553                 /*
 554                  * If we get ENOTSUP, we know that no future
 555                  * attempts will ever succeed.  In this case we
 556                  * set a persistent bit so that we don't bother
 557                  * with the ioctl in the future.
 558                  */
 559                 vd->vdev_notrim = B_TRUE;
 560         }
 561         if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
 562                 /*
 563                  * If provider's error is set we assume it is being
 564                  * removed.
 565                  */
 566                 if (bp->bio_to->error != 0) {
 567                         /*
 568                          * We post the resource as soon as possible, instead of
 569                          * when the async removal actually happens, because the
 570                          * DE is using this information to discard previous I/O
 571                          * errors.
 572                          */
 573                         /* XXX: zfs_post_remove() can sleep. */
 574                         zfs_post_remove(zio->io_spa, vd);
 575                         vd->vdev_remove_wanted = B_TRUE;
 576                         spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
 577                 } else if (!vd->vdev_delayed_close) {
 578                         vd->vdev_delayed_close = B_TRUE;
 579                 }
 580         }
 581         g_destroy_bio(bp);
 582         zio_interrupt(zio);
 583 }
 584
 585 static int
 586 vdev_geom_io_start(zio_t *zio)
 587 {
 588         vdev_t *vd;
 589         struct g_consumer *cp;
 590         struct bio *bp;
 591         int error;
 592
 593         vd = zio->io_vd;
 594
 595         if (zio->io_type == ZIO_TYPE_IOCTL) {
 596                 /* XXPOLICY */
 597                 if (!vdev_readable(vd)) {
 598                         zio->io_error = ENXIO;
 599                         return (ZIO_PIPELINE_CONTINUE);
 600                 }
 601
 602                 switch (zio->io_cmd) {
 603                 case DKIOCFLUSHWRITECACHE:
 604                         if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
 605                                 break;
 606                         if (vd->vdev_nowritecache) {
 607                                 zio->io_error = ENOTSUP;
 608                                 break;
 609                         }
 610                         goto sendreq;
 611                 case DKIOCTRIM:
 612                         if (vdev_geom_bio_delete_disable)
 613                                 break;
 614                         if (vd->vdev_notrim) {
 615                                 zio->io_error = ENOTSUP;
 616                                 break;
 617                         }
 618                         goto sendreq;
 619                 default:
 620                         zio->io_error = ENOTSUP;
 621                 }
 622
 623                 return (ZIO_PIPELINE_CONTINUE);
 624         }
 625 sendreq:
 626         cp = vd->vdev_tsd;
 627         if (cp == NULL) {
 628                 zio->io_error = ENXIO;
 629                 return (ZIO_PIPELINE_CONTINUE);
 630         }
 631         bp = g_alloc_bio();
 632         bp->bio_caller1 = zio;
 633         switch (zio->io_type) {
 634         case ZIO_TYPE_READ:
 635         case ZIO_TYPE_WRITE:
 636                 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
 637                 bp->bio_data = zio->io_data;
 638                 bp->bio_offset = zio->io_offset;
 639                 bp->bio_length = zio->io_size;
 640                 break;
 641         case ZIO_TYPE_IOCTL:
 642                 switch (zio->io_cmd) {
 643                 case DKIOCFLUSHWRITECACHE:
 644                         bp->bio_cmd = BIO_FLUSH;
 645                         bp->bio_flags |= BIO_ORDERED;
 646                         bp->bio_data = NULL;
 647                         bp->bio_offset = cp->provider->mediasize;
 648                         bp->bio_length = 0;
 649                         break;
 650                 case DKIOCTRIM:
 651                         bp->bio_cmd = BIO_DELETE;
 652                         bp->bio_data = NULL;
 653                         bp->bio_offset = zio->io_offset;
 654                         bp->bio_length = zio->io_size;
 655                         break;
 656                 }
 657                 break;
 658         }
 659         bp->bio_done = vdev_geom_io_intr;
 660
 661         g_io_request(bp, cp);
 662
 663         return (ZIO_PIPELINE_STOP);
 664 }
 665
 666 static void
 667 vdev_geom_io_done(zio_t *zio)
 668 {
 669 }
 670
 671 static void
 672 vdev_geom_hold(vdev_t *vd)
 673 {
 674 }
 675
 676 static void
 677 vdev_geom_rele(vdev_t *vd)
 678 {
 679 }
 680
 681 vdev_ops_t vdev_geom_ops = {
 682         vdev_geom_open,
 683         vdev_geom_close,
 684         vdev_default_asize,
 685         vdev_geom_io_start,
 686         vdev_geom_io_done,
 687         NULL,
 688         vdev_geom_hold,
 689         vdev_geom_rele,
 690         VDEV_TYPE_DISK,         /* name of this vdev type */
 691         B_TRUE                  /* leaf vdev */
 692 };