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         if (vd == NULL)
  73                 return;
  74
  75         /*
  76          * Orphan callbacks occur from the GEOM event thread.
  77          * Concurrent with this call, new I/O requests may be
  78          * working their way through GEOM about to find out
  79          * (only once executed by the g_down thread) that we've
  80          * been orphaned from our disk provider.  These I/Os
  81          * must be retired before we can detach our consumer.
  82          * This is most easily achieved by acquiring the
  83          * SPA ZIO configuration lock as a writer, but doing
  84          * so with the GEOM topology lock held would cause
  85          * a lock order reversal.  Instead, rely on the SPA's
  86          * async removal support to invoke a close on this
  87          * vdev once it is safe to do so.
  88          */
  89         zfs_post_remove(vd->vdev_spa, vd);
  90         vd->vdev_remove_wanted = B_TRUE;
  91         spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
  92 }
  93
  94 static struct g_consumer *
  95 vdev_geom_attach(struct g_provider *pp)
  96 {
  97         struct g_geom *gp;
  98         struct g_consumer *cp;
  99
 100         g_topology_assert();
 101
 102         ZFS_LOG(1, "Attaching to %s.", pp->name);
 103         /* Do we have geom already? No? Create one. */
 104         LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
 105                 if (gp->flags & G_GEOM_WITHER)
 106                         continue;
 107                 if (strcmp(gp->name, "zfs::vdev") != 0)
 108                         continue;
 109                 break;
 110         }
 111         if (gp == NULL) {
 112                 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
 113                 gp->orphan = vdev_geom_orphan;
 114                 cp = g_new_consumer(gp);
 115                 if (g_attach(cp, pp) != 0) {
 116                         g_wither_geom(gp, ENXIO);
 117                         return (NULL);
 118                 }
 119                 if (g_access(cp, 1, 0, 1) != 0) {
 120                         g_wither_geom(gp, ENXIO);
 121                         return (NULL);
 122                 }
 123                 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
 124         } else {
 125                 /* Check if we are already connected to this provider. */
 126                 LIST_FOREACH(cp, &gp->consumer, consumer) {
 127                         if (cp->provider == pp) {
 128                                 ZFS_LOG(1, "Found consumer for %s.", pp->name);
 129                                 break;
 130                         }
 131                 }
 132                 if (cp == NULL) {
 133                         cp = g_new_consumer(gp);
 134                         if (g_attach(cp, pp) != 0) {
 135                                 g_destroy_consumer(cp);
 136                                 return (NULL);
 137                         }
 138                         if (g_access(cp, 1, 0, 1) != 0) {
 139                                 g_detach(cp);
 140                                 g_destroy_consumer(cp);
 141                                 return (NULL);
 142                         }
 143                         ZFS_LOG(1, "Created consumer for %s.", pp->name);
 144                 } else {
 145                         if (g_access(cp, 1, 0, 1) != 0)
 146                                 return (NULL);
 147                         ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
 148                 }
 149         }
 150         return (cp);
 151 }
 152
 153 static void
 154 vdev_geom_detach(void *arg, int flag __unused)
 155 {
 156         struct g_geom *gp;
 157         struct g_consumer *cp;
 158
 159         g_topology_assert();
 160         cp = arg;
 161         gp = cp->geom;
 162
 163         ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
 164         g_access(cp, -1, 0, -1);
 165         /* Destroy consumer on last close. */
 166         if (cp->acr == 0 && cp->ace == 0) {
 167                 ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
 168                 if (cp->acw > 0)
 169                         g_access(cp, 0, -cp->acw, 0);
 170                 g_detach(cp);
 171                 g_destroy_consumer(cp);
 172         }
 173         /* Destroy geom if there are no consumers left. */
 174         if (LIST_EMPTY(&gp->consumer)) {
 175                 ZFS_LOG(1, "Destroyed geom %s.", gp->name);
 176                 g_wither_geom(gp, ENXIO);
 177         }
 178 }
 179
 180 static uint64_t
 181 nvlist_get_guid(nvlist_t *list)
 182 {
 183         uint64_t value;
 184
 185         value = 0;
 186         nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, &value);
 187         return (value);
 188 }
 189
 190 static int
 191 vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size)
 192 {
 193         struct bio *bp;
 194         u_char *p;
 195         off_t off, maxio;
 196         int error;
 197
 198         ASSERT((offset % cp->provider->sectorsize) == 0);
 199         ASSERT((size % cp->provider->sectorsize) == 0);
 200
 201         bp = g_alloc_bio();
 202         off = offset;
 203         offset += size;
 204         p = data;
 205         maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
 206         error = 0;
 207
 208         for (; off < offset; off += maxio, p += maxio, size -= maxio) {
 209                 bzero(bp, sizeof(*bp));
 210                 bp->bio_cmd = cmd;
 211                 bp->bio_done = NULL;
 212                 bp->bio_offset = off;
 213                 bp->bio_length = MIN(size, maxio);
 214                 bp->bio_data = p;
 215                 g_io_request(bp, cp);
 216                 error = biowait(bp, "vdev_geom_io");
 217                 if (error != 0)
 218                         break;
 219         }
 220
 221         g_destroy_bio(bp);
 222         return (error);
 223 }
 224
 225 static void
 226 vdev_geom_taste_orphan(struct g_consumer *cp)
 227 {
 228
 229         KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
 230             cp->provider->name));
 231 }
 232
 233 static int
 234 vdev_geom_read_config(struct g_consumer *cp, nvlist_t **config)
 235 {
 236         struct g_provider *pp;
 237         vdev_label_t *label;
 238         char *p, *buf;
 239         size_t buflen;
 240         uint64_t psize;
 241         off_t offset, size;
 242         uint64_t guid, state, txg;
 243         int error, l, len;
 244
 245         g_topology_assert_not();
 246
 247         pp = cp->provider;
 248         ZFS_LOG(1, "Reading config from %s...", pp->name);
 249
 250         psize = pp->mediasize;
 251         psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
 252
 253         size = sizeof(*label) + pp->sectorsize -
 254             ((sizeof(*label) - 1) % pp->sectorsize) - 1;
 255
 256         guid = 0;
 257         label = kmem_alloc(size, KM_SLEEP);
 258         buflen = sizeof(label->vl_vdev_phys.vp_nvlist);
 259
 260         *config = NULL;
 261         for (l = 0; l < VDEV_LABELS; l++) {
 262
 263                 offset = vdev_label_offset(psize, l, 0);
 264                 if ((offset % pp->sectorsize) != 0)
 265                         continue;
 266
 267                 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0)
 268                         continue;
 269                 buf = label->vl_vdev_phys.vp_nvlist;
 270
 271                 if (nvlist_unpack(buf, buflen, config, 0) != 0)
 272                         continue;
 273
 274                 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
 275                     &state) != 0 || state > POOL_STATE_L2CACHE) {
 276                         nvlist_free(*config);
 277                         *config = NULL;
 278                         continue;
 279                 }
 280
 281                 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE &&
 282                     (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
 283                     &txg) != 0 || txg == 0)) {
 284                         nvlist_free(*config);
 285                         *config = NULL;
 286                         continue;
 287                 }
 288
 289                 break;
 290         }
 291
 292         kmem_free(label, size);
 293         return (*config == NULL ? ENOENT : 0);
 294 }
 295
 296 static void
 297 resize_configs(nvlist_t ***configs, uint64_t *count, uint64_t id)
 298 {
 299         nvlist_t **new_configs;
 300         uint64_t i;
 301
 302         if (id < *count)
 303                 return;
 304         new_configs = kmem_zalloc((id + 1) * sizeof(nvlist_t *),
 305             KM_SLEEP);
 306         for (i = 0; i < *count; i++)
 307                 new_configs[i] = (*configs)[i];
 308         if (*configs != NULL)
 309                 kmem_free(*configs, *count * sizeof(void *));
 310         *configs = new_configs;
 311         *count = id + 1;
 312 }
 313
 314 static void
 315 process_vdev_config(nvlist_t ***configs, uint64_t *count, nvlist_t *cfg,
 316     const char *name, uint64_t* known_pool_guid)
 317 {
 318         nvlist_t *vdev_tree;
 319         uint64_t pool_guid;
 320         uint64_t vdev_guid, known_guid;
 321         uint64_t id, txg, known_txg;
 322         char *pname;
 323         int i;
 324
 325         if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 ||
 326             strcmp(pname, name) != 0)
 327                 goto ignore;
 328
 329         if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
 330                 goto ignore;
 331
 332         if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0)
 333                 goto ignore;
 334
 335         if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0)
 336                 goto ignore;
 337
 338         if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0)
 339                 goto ignore;
 340
 341         VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
 342
 343         if (*known_pool_guid != 0) {
 344                 if (pool_guid != *known_pool_guid)
 345                         goto ignore;
 346         } else
 347                 *known_pool_guid = pool_guid;
 348
 349         resize_configs(configs, count, id);
 350
 351         if ((*configs)[id] != NULL) {
 352                 VERIFY(nvlist_lookup_uint64((*configs)[id],
 353                     ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0);
 354                 if (txg <= known_txg)
 355                         goto ignore;
 356                 nvlist_free((*configs)[id]);
 357         }
 358
 359         (*configs)[id] = cfg;
 360         return;
 361
 362 ignore:
 363         nvlist_free(cfg);
 364 }
 365
 366 static int
 367 vdev_geom_attach_taster(struct g_consumer *cp, struct g_provider *pp)
 368 {
 369         int error;
 370
 371         if (pp->flags & G_PF_WITHER)
 372                 return (EINVAL);
 373         if (pp->sectorsize > VDEV_PAD_SIZE || !ISP2(pp->sectorsize))
 374                 return (EINVAL);
 375         g_attach(cp, pp);
 376         error = g_access(cp, 1, 0, 0);
 377         if (error != 0)
 378                 g_detach(cp);
 379         return (error);
 380 }
 381
 382 static void
 383 vdev_geom_detach_taster(struct g_consumer *cp)
 384 {
 385         g_access(cp, -1, 0, 0);
 386         g_detach(cp);
 387 }
 388
 389 int
 390 vdev_geom_read_pool_label(const char *name,
 391     nvlist_t ***configs, uint64_t *count)
 392 {
 393         struct g_class *mp;
 394         struct g_geom *gp, *zgp;
 395         struct g_provider *pp;
 396         struct g_consumer *zcp;
 397         nvlist_t *vdev_cfg;
 398         uint64_t pool_guid;
 399         int error;
 400
 401         DROP_GIANT();
 402         g_topology_lock();
 403
 404         zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
 405         /* This orphan function should be never called. */
 406         zgp->orphan = vdev_geom_taste_orphan;
 407         zcp = g_new_consumer(zgp);
 408
 409         *configs = NULL;
 410         *count = 0;
 411         pool_guid = 0;
 412         LIST_FOREACH(mp, &g_classes, class) {
 413                 if (mp == &zfs_vdev_class)
 414                         continue;
 415                 LIST_FOREACH(gp, &mp->geom, geom) {
 416                         if (gp->flags & G_GEOM_WITHER)
 417                                 continue;
 418                         LIST_FOREACH(pp, &gp->provider, provider) {
 419                                 if (pp->flags & G_PF_WITHER)
 420                                         continue;
 421                                 if (vdev_geom_attach_taster(zcp, pp) != 0)
 422                                         continue;
 423                                 g_topology_unlock();
 424                                 error = vdev_geom_read_config(zcp, &vdev_cfg);
 425                                 g_topology_lock();
 426                                 vdev_geom_detach_taster(zcp);
 427                                 if (error)
 428                                         continue;
 429                                 ZFS_LOG(1, "successfully read vdev config");
 430
 431                                 process_vdev_config(configs, count,
 432                                     vdev_cfg, name, &pool_guid);
 433                         }
 434                 }
 435         }
 436
 437         g_destroy_consumer(zcp);
 438         g_destroy_geom(zgp);
 439         g_topology_unlock();
 440         PICKUP_GIANT();
 441
 442         return (*count > 0 ? 0 : ENOENT);
 443 }
 444
 445 static uint64_t
 446 vdev_geom_read_guid(struct g_consumer *cp)
 447 {
 448         nvlist_t *config;
 449         uint64_t guid;
 450
 451         g_topology_assert_not();
 452
 453         guid = 0;
 454         if (vdev_geom_read_config(cp, &config) == 0) {
 455                 guid = nvlist_get_guid(config);
 456                 nvlist_free(config);
 457         }
 458         return (guid);
 459 }
 460
 461 static struct g_consumer *
 462 vdev_geom_attach_by_guid(uint64_t guid)
 463 {
 464         struct g_class *mp;
 465         struct g_geom *gp, *zgp;
 466         struct g_provider *pp;
 467         struct g_consumer *cp, *zcp;
 468         uint64_t pguid;
 469
 470         g_topology_assert();
 471
 472         zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
 473         /* This orphan function should be never called. */
 474         zgp->orphan = vdev_geom_taste_orphan;
 475         zcp = g_new_consumer(zgp);
 476
 477         cp = NULL;
 478         LIST_FOREACH(mp, &g_classes, class) {
 479                 if (mp == &zfs_vdev_class)
 480                         continue;
 481                 LIST_FOREACH(gp, &mp->geom, geom) {
 482                         if (gp->flags & G_GEOM_WITHER)
 483                                 continue;
 484                         LIST_FOREACH(pp, &gp->provider, provider) {
 485                                 if (vdev_geom_attach_taster(zcp, pp) != 0)
 486                                         continue;
 487                                 g_topology_unlock();
 488                                 pguid = vdev_geom_read_guid(zcp);
 489                                 g_topology_lock();
 490                                 vdev_geom_detach_taster(zcp);
 491                                 if (pguid != guid)
 492                                         continue;
 493                                 cp = vdev_geom_attach(pp);
 494                                 if (cp == NULL) {
 495                                         printf("ZFS WARNING: Unable to attach to %s.\n",
 496                                             pp->name);
 497                                         continue;
 498                                 }
 499                                 break;
 500                         }
 501                         if (cp != NULL)
 502                                 break;
 503                 }
 504                 if (cp != NULL)
 505                         break;
 506         }
 507 end:
 508         g_destroy_consumer(zcp);
 509         g_destroy_geom(zgp);
 510         return (cp);
 511 }
 512
 513 static struct g_consumer *
 514 vdev_geom_open_by_guid(vdev_t *vd)
 515 {
 516         struct g_consumer *cp;
 517         char *buf;
 518         size_t len;
 519
 520         g_topology_assert();
 521
 522         ZFS_LOG(1, "Searching by guid [%ju].", (uintmax_t)vd->vdev_guid);
 523         cp = vdev_geom_attach_by_guid(vd->vdev_guid);
 524         if (cp != NULL) {
 525                 len = strlen(cp->provider->name) + strlen("/dev/") + 1;
 526                 buf = kmem_alloc(len, KM_SLEEP);
 527
 528                 snprintf(buf, len, "/dev/%s", cp->provider->name);
 529                 spa_strfree(vd->vdev_path);
 530                 vd->vdev_path = buf;
 531
 532                 ZFS_LOG(1, "Attach by guid [%ju] succeeded, provider %s.",
 533                     (uintmax_t)vd->vdev_guid, vd->vdev_path);
 534         } else {
 535                 ZFS_LOG(1, "Search by guid [%ju] failed.",
 536                     (uintmax_t)vd->vdev_guid);
 537         }
 538
 539         return (cp);
 540 }
 541
 542 static struct g_consumer *
 543 vdev_geom_open_by_path(vdev_t *vd, int check_guid)
 544 {
 545         struct g_provider *pp;
 546         struct g_consumer *cp;
 547         uint64_t guid;
 548
 549         g_topology_assert();
 550
 551         cp = NULL;
 552         pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
 553         if (pp != NULL) {
 554                 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
 555                 cp = vdev_geom_attach(pp);
 556                 if (cp != NULL && check_guid && ISP2(pp->sectorsize) &&
 557                     pp->sectorsize <= VDEV_PAD_SIZE) {
 558                         g_topology_unlock();
 559                         guid = vdev_geom_read_guid(cp);
 560                         g_topology_lock();
 561                         if (guid != vd->vdev_guid) {
 562                                 vdev_geom_detach(cp, 0);
 563                                 cp = NULL;
 564                                 ZFS_LOG(1, "guid mismatch for provider %s: "
 565                                     "%ju != %ju.", vd->vdev_path,
 566                                     (uintmax_t)vd->vdev_guid, (uintmax_t)guid);
 567                         } else {
 568                                 ZFS_LOG(1, "guid match for provider %s.",
 569                                     vd->vdev_path);
 570                         }
 571                 }
 572         }
 573
 574         return (cp);
 575 }
 576
 577 static int
 578 vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
 579     uint64_t *logical_ashift, uint64_t *physical_ashift)
 580 {
 581         struct g_provider *pp;
 582         struct g_consumer *cp;
 583         size_t bufsize;
 584         int error;
 585
 586         /*
 587          * We must have a pathname, and it must be absolute.
 588          */
 589         if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
 590                 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
 591                 return (EINVAL);
 592         }
 593
 594         vd->vdev_tsd = NULL;
 595
 596         DROP_GIANT();
 597         g_topology_lock();
 598         error = 0;
 599
 600         /*
 601          * If we're creating or splitting a pool, just find the GEOM provider
 602          * by its name and ignore GUID mismatches.
 603          */
 604         if (vd->vdev_spa->spa_load_state == SPA_LOAD_NONE ||
 605             vd->vdev_spa->spa_splitting_newspa == B_TRUE)
 606                 cp = vdev_geom_open_by_path(vd, 0);
 607         else {
 608                 cp = vdev_geom_open_by_path(vd, 1);
 609                 if (cp == NULL) {
 610                         /*
 611                          * The device at vd->vdev_path doesn't have the
 612                          * expected guid. The disks might have merely
 613                          * moved around so try all other GEOM providers
 614                          * to find one with the right guid.
 615                          */
 616                         cp = vdev_geom_open_by_guid(vd);
 617                 }
 618         }
 619
 620         if (cp == NULL) {
 621                 ZFS_LOG(1, "Provider %s not found.", vd->vdev_path);
 622                 error = ENOENT;
 623         } else if (cp->provider->sectorsize > VDEV_PAD_SIZE ||
 624             !ISP2(cp->provider->sectorsize)) {
 625                 ZFS_LOG(1, "Provider %s has unsupported sectorsize.",
 626                     vd->vdev_path);
 627                 vdev_geom_detach(cp, 0);
 628                 error = EINVAL;
 629                 cp = NULL;
 630         } else if (cp->acw == 0 && (spa_mode(vd->vdev_spa) & FWRITE) != 0) {
 631                 int i;
 632
 633                 for (i = 0; i < 5; i++) {
 634                         error = g_access(cp, 0, 1, 0);
 635                         if (error == 0)
 636                                 break;
 637                         g_topology_unlock();
 638                         tsleep(vd, 0, "vdev", hz / 2);
 639                         g_topology_lock();
 640                 }
 641                 if (error != 0) {
 642                         printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n",
 643                             vd->vdev_path, error);
 644                         vdev_geom_detach(cp, 0);
 645                         cp = NULL;
 646                 }
 647         }
 648         g_topology_unlock();
 649         PICKUP_GIANT();
 650         if (cp == NULL) {
 651                 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
 652                 return (error);
 653         }
 654
 655         cp->private = vd;
 656         vd->vdev_tsd = cp;
 657         pp = cp->provider;
 658
 659         /*
 660          * Determine the actual size of the device.
 661          */
 662         *max_psize = *psize = pp->mediasize;
 663
 664         /*
 665          * Determine the device's minimum transfer size and preferred
 666          * transfer size.
 667          */
 668         *logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
 669         *physical_ashift = 0;
 670         if (pp->stripesize)
 671                 *physical_ashift = highbit(pp->stripesize) - 1;
 672
 673         /*
 674          * Clear the nowritecache settings, so that on a vdev_reopen()
 675          * we will try again.
 676          */
 677         vd->vdev_nowritecache = B_FALSE;
 678
 679         if (vd->vdev_physpath != NULL)
 680                 spa_strfree(vd->vdev_physpath);
 681         bufsize = sizeof("/dev/") + strlen(pp->name);
 682         vd->vdev_physpath = kmem_alloc(bufsize, KM_SLEEP);
 683         snprintf(vd->vdev_physpath, bufsize, "/dev/%s", pp->name);
 684
 685         return (0);
 686 }
 687
 688 static void
 689 vdev_geom_close(vdev_t *vd)
 690 {
 691         struct g_consumer *cp;
 692
 693         cp = vd->vdev_tsd;
 694         if (cp == NULL)
 695                 return;
 696         vd->vdev_tsd = NULL;
 697         vd->vdev_delayed_close = B_FALSE;
 698         cp->private = NULL;     /* XXX locking */
 699         g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
 700 }
 701
 702 static void
 703 vdev_geom_io_intr(struct bio *bp)
 704 {
 705         vdev_t *vd;
 706         zio_t *zio;
 707
 708         zio = bp->bio_caller1;
 709         vd = zio->io_vd;
 710         zio->io_error = bp->bio_error;
 711         if (zio->io_error == 0 && bp->bio_resid != 0)
 712                 zio->io_error = EIO;
 713         if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == ENOTSUP) {
 714                 /*
 715                  * If we get ENOTSUP, we know that no future
 716                  * attempts will ever succeed.  In this case we
 717                  * set a persistent bit so that we don't bother
 718                  * with the ioctl in the future.
 719                  */
 720                 vd->vdev_nowritecache = B_TRUE;
 721         }
 722         if (bp->bio_cmd == BIO_DELETE && bp->bio_error == ENOTSUP) {
 723                 /*
 724                  * If we get ENOTSUP, we know that no future
 725                  * attempts will ever succeed.  In this case we
 726                  * set a persistent bit so that we don't bother
 727                  * with the ioctl in the future.
 728                  */
 729                 vd->vdev_notrim = B_TRUE;
 730         }
 731         if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
 732                 /*
 733                  * If provider's error is set we assume it is being
 734                  * removed.
 735                  */
 736                 if (bp->bio_to->error != 0) {
 737                         /*
 738                          * We post the resource as soon as possible, instead of
 739                          * when the async removal actually happens, because the
 740                          * DE is using this information to discard previous I/O
 741                          * errors.
 742                          */
 743                         /* XXX: zfs_post_remove() can sleep. */
 744                         zfs_post_remove(zio->io_spa, vd);
 745                         vd->vdev_remove_wanted = B_TRUE;
 746                         spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
 747                 } else if (!vd->vdev_delayed_close) {
 748                         vd->vdev_delayed_close = B_TRUE;
 749                 }
 750         }
 751         g_destroy_bio(bp);
 752         zio_interrupt(zio);
 753 }
 754
 755 static int
 756 vdev_geom_io_start(zio_t *zio)
 757 {
 758         vdev_t *vd;
 759         struct g_consumer *cp;
 760         struct bio *bp;
 761         int error;
 762
 763         vd = zio->io_vd;
 764
 765         if (zio->io_type == ZIO_TYPE_IOCTL) {
 766                 /* XXPOLICY */
 767                 if (!vdev_readable(vd)) {
 768                         zio->io_error = ENXIO;
 769                         return (ZIO_PIPELINE_CONTINUE);
 770                 }
 771
 772                 switch (zio->io_cmd) {
 773                 case DKIOCFLUSHWRITECACHE:
 774                         if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
 775                                 break;
 776                         if (vd->vdev_nowritecache) {
 777                                 zio->io_error = ENOTSUP;
 778                                 break;
 779                         }
 780                         goto sendreq;
 781                 case DKIOCTRIM:
 782                         if (vdev_geom_bio_delete_disable)
 783                                 break;
 784                         if (vd->vdev_notrim) {
 785                                 zio->io_error = ENOTSUP;
 786                                 break;
 787                         }
 788                         goto sendreq;
 789                 default:
 790                         zio->io_error = ENOTSUP;
 791                 }
 792
 793                 return (ZIO_PIPELINE_CONTINUE);
 794         }
 795 sendreq:
 796         cp = vd->vdev_tsd;
 797         if (cp == NULL) {
 798                 zio->io_error = ENXIO;
 799                 return (ZIO_PIPELINE_CONTINUE);
 800         }
 801         bp = g_alloc_bio();
 802         bp->bio_caller1 = zio;
 803         switch (zio->io_type) {
 804         case ZIO_TYPE_READ:
 805         case ZIO_TYPE_WRITE:
 806                 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
 807                 bp->bio_data = zio->io_data;
 808                 bp->bio_offset = zio->io_offset;
 809                 bp->bio_length = zio->io_size;
 810                 break;
 811         case ZIO_TYPE_IOCTL:
 812                 switch (zio->io_cmd) {
 813                 case DKIOCFLUSHWRITECACHE:
 814                         bp->bio_cmd = BIO_FLUSH;
 815                         bp->bio_flags |= BIO_ORDERED;
 816                         bp->bio_data = NULL;
 817                         bp->bio_offset = cp->provider->mediasize;
 818                         bp->bio_length = 0;
 819                         break;
 820                 case DKIOCTRIM:
 821                         bp->bio_cmd = BIO_DELETE;
 822                         bp->bio_data = NULL;
 823                         bp->bio_offset = zio->io_offset;
 824                         bp->bio_length = zio->io_size;
 825                         break;
 826                 }
 827                 break;
 828         }
 829         bp->bio_done = vdev_geom_io_intr;
 830
 831         g_io_request(bp, cp);
 832
 833         return (ZIO_PIPELINE_STOP);
 834 }
 835
 836 static void
 837 vdev_geom_io_done(zio_t *zio)
 838 {
 839 }
 840
 841 static void
 842 vdev_geom_hold(vdev_t *vd)
 843 {
 844 }
 845
 846 static void
 847 vdev_geom_rele(vdev_t *vd)
 848 {
 849 }
 850
 851 vdev_ops_t vdev_geom_ops = {
 852         vdev_geom_open,
 853         vdev_geom_close,
 854         vdev_default_asize,
 855         vdev_geom_io_start,
 856         vdev_geom_io_done,
 857         NULL,
 858         vdev_geom_hold,
 859         vdev_geom_rele,
 860         VDEV_TYPE_DISK,         /* name of this vdev type */
 861         B_TRUE                  /* leaf vdev */
 862 };