vdev_geom.c revision 299536
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 45static g_attrchanged_t vdev_geom_attrchanged; 46struct g_class zfs_vdev_class = { 47 .name = "ZFS::VDEV", 48 .version = G_VERSION, 49 .attrchanged = vdev_geom_attrchanged, 50}; 51 52DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev); 53 54SYSCTL_DECL(_vfs_zfs_vdev); 55/* Don't send BIO_FLUSH. */ 56static int vdev_geom_bio_flush_disable = 0; 57TUNABLE_INT("vfs.zfs.vdev.bio_flush_disable", &vdev_geom_bio_flush_disable); 58SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RW, 59 &vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH"); 60/* Don't send BIO_DELETE. */ 61static int vdev_geom_bio_delete_disable = 0; 62TUNABLE_INT("vfs.zfs.vdev.bio_delete_disable", &vdev_geom_bio_delete_disable); 63SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_delete_disable, CTLFLAG_RW, 64 &vdev_geom_bio_delete_disable, 0, "Disable BIO_DELETE"); 65 66static void 67vdev_geom_set_rotation_rate(vdev_t *vd, struct g_consumer *cp) 68{ 69 int error; 70 uint16_t rate; 71 72 error = g_getattr("GEOM::rotation_rate", cp, &rate); 73 if (error == 0) 74 vd->vdev_rotation_rate = rate; 75 else 76 vd->vdev_rotation_rate = VDEV_RATE_UNKNOWN; 77} 78 79static void 80vdev_geom_attrchanged(struct g_consumer *cp, const char *attr) 81{ 82 vdev_t *vd; 83 spa_t *spa; 84 char *physpath; 85 int error, physpath_len; 86 87 vd = cp->private; 88 if (vd == NULL) 89 return; 90 91 if (strcmp(attr, "GEOM::rotation_rate") == 0) { 92 vdev_geom_set_rotation_rate(vd, cp); 93 return; 94 } 95 96 if (strcmp(attr, "GEOM::physpath") != 0) 97 return; 98 99 if (g_access(cp, 1, 0, 0) != 0) 100 return; 101 102 /* 103 * Record/Update physical path information for this device. 104 */ 105 spa = vd->vdev_spa; 106 physpath_len = MAXPATHLEN; 107 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 108 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 109 g_access(cp, -1, 0, 0); 110 if (error == 0) { 111 char *old_physpath; 112 113 /* g_topology lock ensures that vdev has not been closed */ 114 g_topology_assert(); 115 old_physpath = vd->vdev_physpath; 116 vd->vdev_physpath = spa_strdup(physpath); 117 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 118 119 if (old_physpath != NULL) 120 spa_strfree(old_physpath); 121 } 122 g_free(physpath); 123} 124 125static void 126vdev_geom_orphan(struct g_consumer *cp) 127{ 128 vdev_t *vd; 129 130 g_topology_assert(); 131 132 vd = cp->private; 133 if (vd == NULL) { 134 /* Vdev close in progress. Ignore the event. */ 135 return; 136 } 137 138 /* 139 * Orphan callbacks occur from the GEOM event thread. 140 * Concurrent with this call, new I/O requests may be 141 * working their way through GEOM about to find out 142 * (only once executed by the g_down thread) that we've 143 * been orphaned from our disk provider. These I/Os 144 * must be retired before we can detach our consumer. 145 * This is most easily achieved by acquiring the 146 * SPA ZIO configuration lock as a writer, but doing 147 * so with the GEOM topology lock held would cause 148 * a lock order reversal. Instead, rely on the SPA's 149 * async removal support to invoke a close on this 150 * vdev once it is safe to do so. 151 */ 152 vd->vdev_remove_wanted = B_TRUE; 153 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE); 154} 155 156static struct g_consumer * 157vdev_geom_attach(struct g_provider *pp, vdev_t *vd) 158{ 159 struct g_geom *gp; 160 struct g_consumer *cp; 161 int error; 162 163 g_topology_assert(); 164 165 ZFS_LOG(1, "Attaching to %s.", pp->name); 166 /* Do we have geom already? No? Create one. */ 167 LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) { 168 if (gp->flags & G_GEOM_WITHER) 169 continue; 170 if (strcmp(gp->name, "zfs::vdev") != 0) 171 continue; 172 break; 173 } 174 if (gp == NULL) { 175 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev"); 176 gp->orphan = vdev_geom_orphan; 177 gp->attrchanged = vdev_geom_attrchanged; 178 cp = g_new_consumer(gp); 179 error = g_attach(cp, pp); 180 if (error != 0) { 181 ZFS_LOG(1, "%s(%d): g_attach failed: %d\n", __func__, 182 __LINE__, error); 183 g_wither_geom(gp, ENXIO); 184 return (NULL); 185 } 186 error = g_access(cp, 1, 0, 1); 187 if (error != 0) { 188 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", __func__, 189 __LINE__, error); 190 g_wither_geom(gp, ENXIO); 191 return (NULL); 192 } 193 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name); 194 } else { 195 /* Check if we are already connected to this provider. */ 196 LIST_FOREACH(cp, &gp->consumer, consumer) { 197 if (cp->provider == pp) { 198 ZFS_LOG(1, "Found consumer for %s.", pp->name); 199 break; 200 } 201 } 202 if (cp == NULL) { 203 cp = g_new_consumer(gp); 204 error = g_attach(cp, pp); 205 if (error != 0) { 206 ZFS_LOG(1, "%s(%d): g_attach failed: %d\n", 207 __func__, __LINE__, error); 208 g_destroy_consumer(cp); 209 return (NULL); 210 } 211 error = g_access(cp, 1, 0, 1); 212 if (error != 0) { 213 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", 214 __func__, __LINE__, error); 215 g_detach(cp); 216 g_destroy_consumer(cp); 217 return (NULL); 218 } 219 ZFS_LOG(1, "Created consumer for %s.", pp->name); 220 } else { 221 error = g_access(cp, 1, 0, 1); 222 if (error != 0) { 223 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", 224 __func__, __LINE__, error); 225 return (NULL); 226 } 227 ZFS_LOG(1, "Used existing consumer for %s.", pp->name); 228 } 229 } 230 231 /* 232 * BUG: cp may already belong to a vdev. This could happen if: 233 * 1) That vdev is a shared spare, or 234 * 2) We are trying to reopen a missing vdev and we are scanning by 235 * guid. In that case, we'll ultimately fail to open this consumer, 236 * but not until after setting the private field. 237 * The solution is to: 238 * 1) Don't set the private field until after the open succeeds, and 239 * 2) Set it to a linked list of vdevs, not just a single vdev 240 */ 241 cp->private = vd; 242 vd->vdev_tsd = cp; 243 244 /* Fetch initial physical path information for this device. */ 245 vdev_geom_attrchanged(cp, "GEOM::physpath"); 246 247 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 248 return (cp); 249} 250 251static void 252vdev_geom_close_locked(vdev_t *vd) 253{ 254 struct g_geom *gp; 255 struct g_consumer *cp; 256 257 g_topology_assert(); 258 259 cp = vd->vdev_tsd; 260 if (cp == NULL) 261 return; 262 263 ZFS_LOG(1, "Closing access to %s.", cp->provider->name); 264 KASSERT(vd->vdev_tsd == cp, ("%s: vdev_tsd is not cp", __func__)); 265 vd->vdev_tsd = NULL; 266 vd->vdev_delayed_close = B_FALSE; 267 cp->private = NULL; 268 269 gp = cp->geom; 270 g_access(cp, -1, 0, -1); 271 /* Destroy consumer on last close. */ 272 if (cp->acr == 0 && cp->ace == 0) { 273 if (cp->acw > 0) 274 g_access(cp, 0, -cp->acw, 0); 275 if (cp->provider != NULL) { 276 ZFS_LOG(1, "Destroyed consumer to %s.", 277 cp->provider->name); 278 g_detach(cp); 279 } 280 g_destroy_consumer(cp); 281 } 282 /* Destroy geom if there are no consumers left. */ 283 if (LIST_EMPTY(&gp->consumer)) { 284 ZFS_LOG(1, "Destroyed geom %s.", gp->name); 285 g_wither_geom(gp, ENXIO); 286 } 287} 288 289static void 290nvlist_get_guids(nvlist_t *list, uint64_t *pguid, uint64_t *vguid) 291{ 292 293 (void) nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, vguid); 294 (void) nvlist_lookup_uint64(list, ZPOOL_CONFIG_POOL_GUID, pguid); 295} 296 297static int 298vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size) 299{ 300 struct bio *bp; 301 u_char *p; 302 off_t off, maxio; 303 int error; 304 305 ASSERT((offset % cp->provider->sectorsize) == 0); 306 ASSERT((size % cp->provider->sectorsize) == 0); 307 308 bp = g_alloc_bio(); 309 off = offset; 310 offset += size; 311 p = data; 312 maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize); 313 error = 0; 314 315 for (; off < offset; off += maxio, p += maxio, size -= maxio) { 316 bzero(bp, sizeof(*bp)); 317 bp->bio_cmd = cmd; 318 bp->bio_done = NULL; 319 bp->bio_offset = off; 320 bp->bio_length = MIN(size, maxio); 321 bp->bio_data = p; 322 g_io_request(bp, cp); 323 error = biowait(bp, "vdev_geom_io"); 324 if (error != 0) 325 break; 326 } 327 328 g_destroy_bio(bp); 329 return (error); 330} 331 332static void 333vdev_geom_taste_orphan(struct g_consumer *cp) 334{ 335 336 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 337 cp->provider->name)); 338} 339 340static int 341vdev_geom_read_config(struct g_consumer *cp, nvlist_t **config) 342{ 343 struct g_provider *pp; 344 vdev_label_t *label; 345 char *p, *buf; 346 size_t buflen; 347 uint64_t psize; 348 off_t offset, size; 349 uint64_t state, txg; 350 int error, l, len; 351 352 g_topology_assert_not(); 353 354 pp = cp->provider; 355 ZFS_LOG(1, "Reading config from %s...", pp->name); 356 357 psize = pp->mediasize; 358 psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t)); 359 360 size = sizeof(*label) + pp->sectorsize - 361 ((sizeof(*label) - 1) % pp->sectorsize) - 1; 362 363 label = kmem_alloc(size, KM_SLEEP); 364 buflen = sizeof(label->vl_vdev_phys.vp_nvlist); 365 366 *config = NULL; 367 for (l = 0; l < VDEV_LABELS; l++) { 368 369 offset = vdev_label_offset(psize, l, 0); 370 if ((offset % pp->sectorsize) != 0) 371 continue; 372 373 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0) 374 continue; 375 buf = label->vl_vdev_phys.vp_nvlist; 376 377 if (nvlist_unpack(buf, buflen, config, 0) != 0) 378 continue; 379 380 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 381 &state) != 0 || state > POOL_STATE_L2CACHE) { 382 nvlist_free(*config); 383 *config = NULL; 384 continue; 385 } 386 387 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 388 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 389 &txg) != 0 || txg == 0)) { 390 nvlist_free(*config); 391 *config = NULL; 392 continue; 393 } 394 395 break; 396 } 397 398 kmem_free(label, size); 399 return (*config == NULL ? ENOENT : 0); 400} 401 402static void 403resize_configs(nvlist_t ***configs, uint64_t *count, uint64_t id) 404{ 405 nvlist_t **new_configs; 406 uint64_t i; 407 408 if (id < *count) 409 return; 410 new_configs = kmem_zalloc((id + 1) * sizeof(nvlist_t *), 411 KM_SLEEP); 412 for (i = 0; i < *count; i++) 413 new_configs[i] = (*configs)[i]; 414 if (*configs != NULL) 415 kmem_free(*configs, *count * sizeof(void *)); 416 *configs = new_configs; 417 *count = id + 1; 418} 419 420static void 421process_vdev_config(nvlist_t ***configs, uint64_t *count, nvlist_t *cfg, 422 const char *name, uint64_t* known_pool_guid) 423{ 424 nvlist_t *vdev_tree; 425 uint64_t pool_guid; 426 uint64_t vdev_guid, known_guid; 427 uint64_t id, txg, known_txg; 428 char *pname; 429 int i; 430 431 if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 || 432 strcmp(pname, name) != 0) 433 goto ignore; 434 435 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0) 436 goto ignore; 437 438 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0) 439 goto ignore; 440 441 if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0) 442 goto ignore; 443 444 if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0) 445 goto ignore; 446 447 VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 448 449 if (*known_pool_guid != 0) { 450 if (pool_guid != *known_pool_guid) 451 goto ignore; 452 } else 453 *known_pool_guid = pool_guid; 454 455 resize_configs(configs, count, id); 456 457 if ((*configs)[id] != NULL) { 458 VERIFY(nvlist_lookup_uint64((*configs)[id], 459 ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0); 460 if (txg <= known_txg) 461 goto ignore; 462 nvlist_free((*configs)[id]); 463 } 464 465 (*configs)[id] = cfg; 466 return; 467 468ignore: 469 nvlist_free(cfg); 470} 471 472static int 473vdev_geom_attach_taster(struct g_consumer *cp, struct g_provider *pp) 474{ 475 int error; 476 477 if (pp->flags & G_PF_WITHER) 478 return (EINVAL); 479 g_attach(cp, pp); 480 error = g_access(cp, 1, 0, 0); 481 if (error == 0) { 482 if (pp->sectorsize > VDEV_PAD_SIZE || !ISP2(pp->sectorsize)) 483 error = EINVAL; 484 else if (pp->mediasize < SPA_MINDEVSIZE) 485 error = EINVAL; 486 if (error != 0) 487 g_access(cp, -1, 0, 0); 488 } 489 if (error != 0) 490 g_detach(cp); 491 return (error); 492} 493 494static void 495vdev_geom_detach_taster(struct g_consumer *cp) 496{ 497 g_access(cp, -1, 0, 0); 498 g_detach(cp); 499} 500 501int 502vdev_geom_read_pool_label(const char *name, 503 nvlist_t ***configs, uint64_t *count) 504{ 505 struct g_class *mp; 506 struct g_geom *gp, *zgp; 507 struct g_provider *pp; 508 struct g_consumer *zcp; 509 nvlist_t *vdev_cfg; 510 uint64_t pool_guid; 511 int error; 512 513 DROP_GIANT(); 514 g_topology_lock(); 515 516 zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste"); 517 /* This orphan function should be never called. */ 518 zgp->orphan = vdev_geom_taste_orphan; 519 zcp = g_new_consumer(zgp); 520 521 *configs = NULL; 522 *count = 0; 523 pool_guid = 0; 524 LIST_FOREACH(mp, &g_classes, class) { 525 if (mp == &zfs_vdev_class) 526 continue; 527 LIST_FOREACH(gp, &mp->geom, geom) { 528 if (gp->flags & G_GEOM_WITHER) 529 continue; 530 LIST_FOREACH(pp, &gp->provider, provider) { 531 if (pp->flags & G_PF_WITHER) 532 continue; 533 if (vdev_geom_attach_taster(zcp, pp) != 0) 534 continue; 535 g_topology_unlock(); 536 error = vdev_geom_read_config(zcp, &vdev_cfg); 537 g_topology_lock(); 538 vdev_geom_detach_taster(zcp); 539 if (error) 540 continue; 541 ZFS_LOG(1, "successfully read vdev config"); 542 543 process_vdev_config(configs, count, 544 vdev_cfg, name, &pool_guid); 545 } 546 } 547 } 548 549 g_destroy_consumer(zcp); 550 g_destroy_geom(zgp); 551 g_topology_unlock(); 552 PICKUP_GIANT(); 553 554 return (*count > 0 ? 0 : ENOENT); 555} 556 557static void 558vdev_geom_read_guids(struct g_consumer *cp, uint64_t *pguid, uint64_t *vguid) 559{ 560 nvlist_t *config; 561 562 g_topology_assert_not(); 563 564 *pguid = 0; 565 *vguid = 0; 566 if (vdev_geom_read_config(cp, &config) == 0) { 567 nvlist_get_guids(config, pguid, vguid); 568 nvlist_free(config); 569 } 570} 571 572static struct g_consumer * 573vdev_geom_attach_by_guids(vdev_t *vd) 574{ 575 struct g_class *mp; 576 struct g_geom *gp, *zgp; 577 struct g_provider *pp; 578 struct g_consumer *cp, *zcp; 579 uint64_t pguid, vguid; 580 581 g_topology_assert(); 582 583 zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste"); 584 /* This orphan function should be never called. */ 585 zgp->orphan = vdev_geom_taste_orphan; 586 zcp = g_new_consumer(zgp); 587 588 cp = NULL; 589 LIST_FOREACH(mp, &g_classes, class) { 590 if (mp == &zfs_vdev_class) 591 continue; 592 LIST_FOREACH(gp, &mp->geom, geom) { 593 if (gp->flags & G_GEOM_WITHER) 594 continue; 595 LIST_FOREACH(pp, &gp->provider, provider) { 596 if (vdev_geom_attach_taster(zcp, pp) != 0) 597 continue; 598 g_topology_unlock(); 599 vdev_geom_read_guids(zcp, &pguid, &vguid); 600 g_topology_lock(); 601 vdev_geom_detach_taster(zcp); 602 /* 603 * Check that the label's vdev guid matches the 604 * desired guid. If the label has a pool guid, 605 * check that it matches too. (Inactive spares 606 * and L2ARCs do not have any pool guid in the 607 * label.) 608 */ 609 if ((pguid != 0 && 610 pguid != spa_guid(vd->vdev_spa)) || 611 vguid != vd->vdev_guid) 612 continue; 613 cp = vdev_geom_attach(pp, vd); 614 if (cp == NULL) { 615 printf("ZFS WARNING: Unable to " 616 "attach to %s.\n", pp->name); 617 continue; 618 } 619 break; 620 } 621 if (cp != NULL) 622 break; 623 } 624 if (cp != NULL) 625 break; 626 } 627end: 628 g_destroy_consumer(zcp); 629 g_destroy_geom(zgp); 630 return (cp); 631} 632 633static struct g_consumer * 634vdev_geom_open_by_guids(vdev_t *vd) 635{ 636 struct g_consumer *cp; 637 char *buf; 638 size_t len; 639 640 g_topology_assert(); 641 642 ZFS_LOG(1, "Searching by guids [%ju:%ju].", 643 (uintmax_t)spa_guid(vd->vdev_spa), (uintmax_t)vd->vdev_guid); 644 cp = vdev_geom_attach_by_guids(vd); 645 if (cp != NULL) { 646 len = strlen(cp->provider->name) + strlen("/dev/") + 1; 647 buf = kmem_alloc(len, KM_SLEEP); 648 649 snprintf(buf, len, "/dev/%s", cp->provider->name); 650 spa_strfree(vd->vdev_path); 651 vd->vdev_path = buf; 652 653 ZFS_LOG(1, "Attach by guid [%ju:%ju] succeeded, provider %s.", 654 (uintmax_t)spa_guid(vd->vdev_spa), 655 (uintmax_t)vd->vdev_guid, vd->vdev_path); 656 } else { 657 ZFS_LOG(1, "Search by guid [%ju:%ju] failed.", 658 (uintmax_t)spa_guid(vd->vdev_spa), 659 (uintmax_t)vd->vdev_guid); 660 } 661 662 return (cp); 663} 664 665static struct g_consumer * 666vdev_geom_open_by_path(vdev_t *vd, int check_guid) 667{ 668 struct g_provider *pp; 669 struct g_consumer *cp; 670 uint64_t pguid, vguid; 671 672 g_topology_assert(); 673 674 cp = NULL; 675 pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1); 676 if (pp != NULL) { 677 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path); 678 cp = vdev_geom_attach(pp, vd); 679 if (cp != NULL && check_guid && ISP2(pp->sectorsize) && 680 pp->sectorsize <= VDEV_PAD_SIZE) { 681 g_topology_unlock(); 682 vdev_geom_read_guids(cp, &pguid, &vguid); 683 g_topology_lock(); 684 /* 685 * Check that the label's vdev guid matches the 686 * desired guid. If the label has a pool guid, 687 * check that it matches too. (Inactive spares 688 * and L2ARCs do not have any pool guid in the 689 * label.) 690 */ 691 if ((pguid != 0 && 692 pguid != spa_guid(vd->vdev_spa)) || 693 vguid != vd->vdev_guid) { 694 vdev_geom_close_locked(vd); 695 cp = NULL; 696 ZFS_LOG(1, "guid mismatch for provider %s: " 697 "%ju:%ju != %ju:%ju.", vd->vdev_path, 698 (uintmax_t)spa_guid(vd->vdev_spa), 699 (uintmax_t)vd->vdev_guid, 700 (uintmax_t)pguid, (uintmax_t)vguid); 701 } else { 702 ZFS_LOG(1, "guid match for provider %s.", 703 vd->vdev_path); 704 } 705 } 706 } 707 708 return (cp); 709} 710 711static int 712vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, 713 uint64_t *logical_ashift, uint64_t *physical_ashift) 714{ 715 struct g_provider *pp; 716 struct g_consumer *cp; 717 size_t bufsize; 718 int error; 719 720 /* 721 * We must have a pathname, and it must be absolute. 722 */ 723 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 724 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 725 return (EINVAL); 726 } 727 728 vd->vdev_tsd = NULL; 729 730 DROP_GIANT(); 731 g_topology_lock(); 732 error = 0; 733 734 if (vd->vdev_spa->spa_splitting_newspa || 735 (vd->vdev_prevstate == VDEV_STATE_UNKNOWN && 736 vd->vdev_spa->spa_load_state == SPA_LOAD_NONE)) { 737 /* 738 * We are dealing with a vdev that hasn't been previously 739 * opened (since boot), and we are not loading an 740 * existing pool configuration. This looks like a 741 * vdev add operation to a new or existing pool. 742 * Assume the user knows what he/she is doing and find 743 * GEOM provider by its name, ignoring GUID mismatches. 744 * 745 * XXPOLICY: It would be safer to only allow a device 746 * that is unlabeled or labeled but missing 747 * GUID information to be opened in this fashion, 748 * unless we are doing a split, in which case we 749 * should allow any guid. 750 */ 751 cp = vdev_geom_open_by_path(vd, 0); 752 } else { 753 /* 754 * Try using the recorded path for this device, but only 755 * accept it if its label data contains the expected GUIDs. 756 */ 757 cp = vdev_geom_open_by_path(vd, 1); 758 if (cp == NULL) { 759 /* 760 * The device at vd->vdev_path doesn't have the 761 * expected GUIDs. The disks might have merely 762 * moved around so try all other GEOM providers 763 * to find one with the right GUIDs. 764 */ 765 cp = vdev_geom_open_by_guids(vd); 766 } 767 } 768 769 if (cp == NULL) { 770 ZFS_LOG(1, "Provider %s not found.", vd->vdev_path); 771 error = ENOENT; 772 } else if (cp->provider->sectorsize > VDEV_PAD_SIZE || 773 !ISP2(cp->provider->sectorsize)) { 774 ZFS_LOG(1, "Provider %s has unsupported sectorsize.", 775 vd->vdev_path); 776 777 vdev_geom_close_locked(vd); 778 error = EINVAL; 779 cp = NULL; 780 } else if (cp->acw == 0 && (spa_mode(vd->vdev_spa) & FWRITE) != 0) { 781 int i; 782 783 for (i = 0; i < 5; i++) { 784 error = g_access(cp, 0, 1, 0); 785 if (error == 0) 786 break; 787 g_topology_unlock(); 788 tsleep(vd, 0, "vdev", hz / 2); 789 g_topology_lock(); 790 } 791 if (error != 0) { 792 printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n", 793 vd->vdev_path, error); 794 vdev_geom_close_locked(vd); 795 cp = NULL; 796 } 797 } 798 799 g_topology_unlock(); 800 PICKUP_GIANT(); 801 if (cp == NULL) { 802 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 803 return (error); 804 } 805 pp = cp->provider; 806 807 /* 808 * Determine the actual size of the device. 809 */ 810 *max_psize = *psize = pp->mediasize; 811 812 /* 813 * Determine the device's minimum transfer size and preferred 814 * transfer size. 815 */ 816 *logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1; 817 *physical_ashift = 0; 818 if (pp->stripesize > (1 << *logical_ashift) && ISP2(pp->stripesize) && 819 pp->stripesize <= (1 << SPA_MAXASHIFT) && pp->stripeoffset == 0) 820 *physical_ashift = highbit(pp->stripesize) - 1; 821 822 /* 823 * Clear the nowritecache settings, so that on a vdev_reopen() 824 * we will try again. 825 */ 826 vd->vdev_nowritecache = B_FALSE; 827 828 /* 829 * Determine the device's rotation rate. 830 */ 831 vdev_geom_set_rotation_rate(vd, cp); 832 833 return (0); 834} 835 836static void 837vdev_geom_close(vdev_t *vd) 838{ 839 840 DROP_GIANT(); 841 g_topology_lock(); 842 vdev_geom_close_locked(vd); 843 g_topology_unlock(); 844 PICKUP_GIANT(); 845} 846 847static void 848vdev_geom_io_intr(struct bio *bp) 849{ 850 vdev_t *vd; 851 zio_t *zio; 852 853 zio = bp->bio_caller1; 854 vd = zio->io_vd; 855 zio->io_error = bp->bio_error; 856 if (zio->io_error == 0 && bp->bio_resid != 0) 857 zio->io_error = SET_ERROR(EIO); 858 859 switch(zio->io_error) { 860 case ENOTSUP: 861 /* 862 * If we get ENOTSUP for BIO_FLUSH or BIO_DELETE we know 863 * that future attempts will never succeed. In this case 864 * we set a persistent flag so that we don't bother with 865 * requests in the future. 866 */ 867 switch(bp->bio_cmd) { 868 case BIO_FLUSH: 869 vd->vdev_nowritecache = B_TRUE; 870 break; 871 case BIO_DELETE: 872 vd->vdev_notrim = B_TRUE; 873 break; 874 } 875 break; 876 case ENXIO: 877 if (!vd->vdev_remove_wanted) { 878 /* 879 * If provider's error is set we assume it is being 880 * removed. 881 */ 882 if (bp->bio_to->error != 0) { 883 vd->vdev_remove_wanted = B_TRUE; 884 spa_async_request(zio->io_spa, 885 SPA_ASYNC_REMOVE); 886 } else if (!vd->vdev_delayed_close) { 887 vd->vdev_delayed_close = B_TRUE; 888 } 889 } 890 break; 891 } 892 g_destroy_bio(bp); 893 zio_delay_interrupt(zio); 894} 895 896static void 897vdev_geom_io_start(zio_t *zio) 898{ 899 vdev_t *vd; 900 struct g_consumer *cp; 901 struct bio *bp; 902 int error; 903 904 vd = zio->io_vd; 905 906 switch (zio->io_type) { 907 case ZIO_TYPE_IOCTL: 908 /* XXPOLICY */ 909 if (!vdev_readable(vd)) { 910 zio->io_error = SET_ERROR(ENXIO); 911 zio_interrupt(zio); 912 return; 913 } else { 914 switch (zio->io_cmd) { 915 case DKIOCFLUSHWRITECACHE: 916 if (zfs_nocacheflush || vdev_geom_bio_flush_disable) 917 break; 918 if (vd->vdev_nowritecache) { 919 zio->io_error = SET_ERROR(ENOTSUP); 920 break; 921 } 922 goto sendreq; 923 default: 924 zio->io_error = SET_ERROR(ENOTSUP); 925 } 926 } 927 928 zio_execute(zio); 929 return; 930 case ZIO_TYPE_FREE: 931 if (vd->vdev_notrim) { 932 zio->io_error = SET_ERROR(ENOTSUP); 933 } else if (!vdev_geom_bio_delete_disable) { 934 goto sendreq; 935 } 936 zio_execute(zio); 937 return; 938 } 939sendreq: 940 ASSERT(zio->io_type == ZIO_TYPE_READ || 941 zio->io_type == ZIO_TYPE_WRITE || 942 zio->io_type == ZIO_TYPE_FREE || 943 zio->io_type == ZIO_TYPE_IOCTL); 944 945 cp = vd->vdev_tsd; 946 if (cp == NULL) { 947 zio->io_error = SET_ERROR(ENXIO); 948 zio_interrupt(zio); 949 return; 950 } 951 bp = g_alloc_bio(); 952 bp->bio_caller1 = zio; 953 switch (zio->io_type) { 954 case ZIO_TYPE_READ: 955 case ZIO_TYPE_WRITE: 956 zio->io_target_timestamp = zio_handle_io_delay(zio); 957 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE; 958 bp->bio_data = zio->io_data; 959 bp->bio_offset = zio->io_offset; 960 bp->bio_length = zio->io_size; 961 break; 962 case ZIO_TYPE_FREE: 963 bp->bio_cmd = BIO_DELETE; 964 bp->bio_data = NULL; 965 bp->bio_offset = zio->io_offset; 966 bp->bio_length = zio->io_size; 967 break; 968 case ZIO_TYPE_IOCTL: 969 bp->bio_cmd = BIO_FLUSH; 970 bp->bio_flags |= BIO_ORDERED; 971 bp->bio_data = NULL; 972 bp->bio_offset = cp->provider->mediasize; 973 bp->bio_length = 0; 974 break; 975 } 976 bp->bio_done = vdev_geom_io_intr; 977 978 g_io_request(bp, cp); 979} 980 981static void 982vdev_geom_io_done(zio_t *zio) 983{ 984} 985 986static void 987vdev_geom_hold(vdev_t *vd) 988{ 989} 990 991static void 992vdev_geom_rele(vdev_t *vd) 993{ 994} 995 996vdev_ops_t vdev_geom_ops = { 997 vdev_geom_open, 998 vdev_geom_close, 999 vdev_default_asize, 1000 vdev_geom_io_start, 1001 vdev_geom_io_done, 1002 NULL, 1003 vdev_geom_hold, 1004 vdev_geom_rele, 1005 VDEV_TYPE_DISK, /* name of this vdev type */ 1006 B_TRUE /* leaf vdev */ 1007}; 1008