vdev_geom.c revision 308059
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 66/* Declare local functions */ 67static void vdev_geom_detach(struct g_consumer *cp, boolean_t open_for_read); 68 69/* 70 * Thread local storage used to indicate when a thread is probing geoms 71 * for their guids. If NULL, this thread is not tasting geoms. If non NULL, 72 * it is looking for a replacement for the vdev_t* that is its value. 73 */ 74uint_t zfs_geom_probe_vdev_key; 75 76static void 77vdev_geom_set_rotation_rate(vdev_t *vd, struct g_consumer *cp) 78{ 79 int error; 80 uint16_t rate; 81 82 error = g_getattr("GEOM::rotation_rate", cp, &rate); 83 if (error == 0) 84 vd->vdev_rotation_rate = rate; 85 else 86 vd->vdev_rotation_rate = VDEV_RATE_UNKNOWN; 87} 88 89static void 90vdev_geom_attrchanged(struct g_consumer *cp, const char *attr) 91{ 92 vdev_t *vd; 93 spa_t *spa; 94 char *physpath; 95 int error, physpath_len; 96 97 vd = cp->private; 98 if (vd == NULL) 99 return; 100 101 if (strcmp(attr, "GEOM::rotation_rate") == 0) { 102 vdev_geom_set_rotation_rate(vd, cp); 103 return; 104 } 105 106 if (strcmp(attr, "GEOM::physpath") != 0) 107 return; 108 109 if (g_access(cp, 1, 0, 0) != 0) 110 return; 111 112 /* 113 * Record/Update physical path information for this device. 114 */ 115 spa = vd->vdev_spa; 116 physpath_len = MAXPATHLEN; 117 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 118 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 119 g_access(cp, -1, 0, 0); 120 if (error == 0) { 121 char *old_physpath; 122 123 /* g_topology lock ensures that vdev has not been closed */ 124 g_topology_assert(); 125 old_physpath = vd->vdev_physpath; 126 vd->vdev_physpath = spa_strdup(physpath); 127 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 128 129 if (old_physpath != NULL) 130 spa_strfree(old_physpath); 131 } 132 g_free(physpath); 133} 134 135static void 136vdev_geom_orphan(struct g_consumer *cp) 137{ 138 vdev_t *vd; 139 140 g_topology_assert(); 141 142 vd = cp->private; 143 if (vd == NULL) { 144 /* Vdev close in progress. Ignore the event. */ 145 return; 146 } 147 148 /* 149 * Orphan callbacks occur from the GEOM event thread. 150 * Concurrent with this call, new I/O requests may be 151 * working their way through GEOM about to find out 152 * (only once executed by the g_down thread) that we've 153 * been orphaned from our disk provider. These I/Os 154 * must be retired before we can detach our consumer. 155 * This is most easily achieved by acquiring the 156 * SPA ZIO configuration lock as a writer, but doing 157 * so with the GEOM topology lock held would cause 158 * a lock order reversal. Instead, rely on the SPA's 159 * async removal support to invoke a close on this 160 * vdev once it is safe to do so. 161 */ 162 vd->vdev_remove_wanted = B_TRUE; 163 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE); 164} 165 166static struct g_consumer * 167vdev_geom_attach(struct g_provider *pp, vdev_t *vd) 168{ 169 struct g_geom *gp; 170 struct g_consumer *cp; 171 int error; 172 173 g_topology_assert(); 174 175 ZFS_LOG(1, "Attaching to %s.", pp->name); 176 177 if (pp->sectorsize > VDEV_PAD_SIZE || !ISP2(pp->sectorsize)) { 178 ZFS_LOG(1, "Failing attach of %s. Incompatible sectorsize %d\n", 179 pp->name, pp->sectorsize); 180 return (NULL); 181 } else if (pp->mediasize < SPA_MINDEVSIZE) { 182 ZFS_LOG(1, "Failing attach of %s. Incompatible mediasize %ju\n", 183 pp->name, pp->mediasize); 184 return (NULL); 185 } 186 187 /* Do we have geom already? No? Create one. */ 188 LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) { 189 if (gp->flags & G_GEOM_WITHER) 190 continue; 191 if (strcmp(gp->name, "zfs::vdev") != 0) 192 continue; 193 break; 194 } 195 if (gp == NULL) { 196 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev"); 197 gp->orphan = vdev_geom_orphan; 198 gp->attrchanged = vdev_geom_attrchanged; 199 cp = g_new_consumer(gp); 200 error = g_attach(cp, pp); 201 if (error != 0) { 202 ZFS_LOG(1, "%s(%d): g_attach failed: %d\n", __func__, 203 __LINE__, error); 204 vdev_geom_detach(cp, B_FALSE); 205 return (NULL); 206 } 207 error = g_access(cp, 1, 0, 1); 208 if (error != 0) { 209 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", __func__, 210 __LINE__, error); 211 vdev_geom_detach(cp, B_FALSE); 212 return (NULL); 213 } 214 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name); 215 } else { 216 /* Check if we are already connected to this provider. */ 217 LIST_FOREACH(cp, &gp->consumer, consumer) { 218 if (cp->provider == pp) { 219 ZFS_LOG(1, "Found consumer for %s.", pp->name); 220 break; 221 } 222 } 223 if (cp == NULL) { 224 cp = g_new_consumer(gp); 225 error = g_attach(cp, pp); 226 if (error != 0) { 227 ZFS_LOG(1, "%s(%d): g_attach failed: %d\n", 228 __func__, __LINE__, error); 229 vdev_geom_detach(cp, B_FALSE); 230 return (NULL); 231 } 232 error = g_access(cp, 1, 0, 1); 233 if (error != 0) { 234 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", 235 __func__, __LINE__, error); 236 vdev_geom_detach(cp, B_FALSE); 237 return (NULL); 238 } 239 ZFS_LOG(1, "Created consumer for %s.", pp->name); 240 } else { 241 error = g_access(cp, 1, 0, 1); 242 if (error != 0) { 243 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", 244 __func__, __LINE__, error); 245 return (NULL); 246 } 247 ZFS_LOG(1, "Used existing consumer for %s.", pp->name); 248 } 249 } 250 251 /* 252 * BUG: cp may already belong to a vdev. This could happen if: 253 * 1) That vdev is a shared spare, or 254 * 2) We are trying to reopen a missing vdev and we are scanning by 255 * guid. In that case, we'll ultimately fail to open this consumer, 256 * but not until after setting the private field. 257 * The solution is to: 258 * 1) Don't set the private field until after the open succeeds, and 259 * 2) Set it to a linked list of vdevs, not just a single vdev 260 */ 261 cp->private = vd; 262 if (vd != NULL) 263 vd->vdev_tsd = cp; 264 265 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 266 return (cp); 267} 268 269static void 270vdev_geom_detach(struct g_consumer *cp, boolean_t open_for_read) 271{ 272 struct g_geom *gp; 273 vdev_t *vd; 274 275 g_topology_assert(); 276 277 ZFS_LOG(1, "Detaching consumer. Provider %s.", 278 cp->provider && cp->provider->name ? cp->provider->name : "NULL"); 279 280 vd = cp->private; 281 cp->private = NULL; 282 283 gp = cp->geom; 284 if (open_for_read) 285 g_access(cp, -1, 0, -1); 286 /* Destroy consumer on last close. */ 287 if (cp->acr == 0 && cp->ace == 0) { 288 if (cp->acw > 0) 289 g_access(cp, 0, -cp->acw, 0); 290 if (cp->provider != NULL) { 291 ZFS_LOG(1, "Destroying consumer to %s.", 292 cp->provider->name ? cp->provider->name : "NULL"); 293 g_detach(cp); 294 } 295 g_destroy_consumer(cp); 296 } 297 /* Destroy geom if there are no consumers left. */ 298 if (LIST_EMPTY(&gp->consumer)) { 299 ZFS_LOG(1, "Destroyed geom %s.", gp->name); 300 g_wither_geom(gp, ENXIO); 301 } 302} 303 304static void 305vdev_geom_close_locked(vdev_t *vd) 306{ 307 struct g_consumer *cp; 308 309 g_topology_assert(); 310 311 cp = vd->vdev_tsd; 312 vd->vdev_tsd = NULL; 313 vd->vdev_delayed_close = B_FALSE; 314 if (cp == NULL) 315 return; 316 317 ZFS_LOG(1, "Closing access to %s.", cp->provider->name); 318 319 vdev_geom_detach(cp, B_TRUE); 320} 321 322static void 323nvlist_get_guids(nvlist_t *list, uint64_t *pguid, uint64_t *vguid) 324{ 325 326 (void) nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, vguid); 327 (void) nvlist_lookup_uint64(list, ZPOOL_CONFIG_POOL_GUID, pguid); 328} 329 330static int 331vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size) 332{ 333 struct bio *bp; 334 u_char *p; 335 off_t off, maxio; 336 int error; 337 338 ASSERT((offset % cp->provider->sectorsize) == 0); 339 ASSERT((size % cp->provider->sectorsize) == 0); 340 341 bp = g_alloc_bio(); 342 off = offset; 343 offset += size; 344 p = data; 345 maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize); 346 error = 0; 347 348 for (; off < offset; off += maxio, p += maxio, size -= maxio) { 349 bzero(bp, sizeof(*bp)); 350 bp->bio_cmd = cmd; 351 bp->bio_done = NULL; 352 bp->bio_offset = off; 353 bp->bio_length = MIN(size, maxio); 354 bp->bio_data = p; 355 g_io_request(bp, cp); 356 error = biowait(bp, "vdev_geom_io"); 357 if (error != 0) 358 break; 359 } 360 361 g_destroy_bio(bp); 362 return (error); 363} 364 365static int 366vdev_geom_read_config(struct g_consumer *cp, nvlist_t **config) 367{ 368 struct g_provider *pp; 369 vdev_label_t *label; 370 char *p, *buf; 371 size_t buflen; 372 uint64_t psize; 373 off_t offset, size; 374 uint64_t state, txg; 375 int error, l, len; 376 377 g_topology_assert_not(); 378 379 pp = cp->provider; 380 ZFS_LOG(1, "Reading config from %s...", pp->name); 381 382 psize = pp->mediasize; 383 psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t)); 384 385 size = sizeof(*label) + pp->sectorsize - 386 ((sizeof(*label) - 1) % pp->sectorsize) - 1; 387 388 label = kmem_alloc(size, KM_SLEEP); 389 buflen = sizeof(label->vl_vdev_phys.vp_nvlist); 390 391 *config = NULL; 392 for (l = 0; l < VDEV_LABELS; l++) { 393 394 offset = vdev_label_offset(psize, l, 0); 395 if ((offset % pp->sectorsize) != 0) 396 continue; 397 398 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0) 399 continue; 400 buf = label->vl_vdev_phys.vp_nvlist; 401 402 if (nvlist_unpack(buf, buflen, config, 0) != 0) 403 continue; 404 405 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 406 &state) != 0 || state > POOL_STATE_L2CACHE) { 407 nvlist_free(*config); 408 *config = NULL; 409 continue; 410 } 411 412 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 413 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 414 &txg) != 0 || txg == 0)) { 415 nvlist_free(*config); 416 *config = NULL; 417 continue; 418 } 419 420 break; 421 } 422 423 kmem_free(label, size); 424 return (*config == NULL ? ENOENT : 0); 425} 426 427static void 428resize_configs(nvlist_t ***configs, uint64_t *count, uint64_t id) 429{ 430 nvlist_t **new_configs; 431 uint64_t i; 432 433 if (id < *count) 434 return; 435 new_configs = kmem_zalloc((id + 1) * sizeof(nvlist_t *), 436 KM_SLEEP); 437 for (i = 0; i < *count; i++) 438 new_configs[i] = (*configs)[i]; 439 if (*configs != NULL) 440 kmem_free(*configs, *count * sizeof(void *)); 441 *configs = new_configs; 442 *count = id + 1; 443} 444 445static void 446process_vdev_config(nvlist_t ***configs, uint64_t *count, nvlist_t *cfg, 447 const char *name, uint64_t* known_pool_guid) 448{ 449 nvlist_t *vdev_tree; 450 uint64_t pool_guid; 451 uint64_t vdev_guid, known_guid; 452 uint64_t id, txg, known_txg; 453 char *pname; 454 int i; 455 456 if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 || 457 strcmp(pname, name) != 0) 458 goto ignore; 459 460 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0) 461 goto ignore; 462 463 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0) 464 goto ignore; 465 466 if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0) 467 goto ignore; 468 469 if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0) 470 goto ignore; 471 472 VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 473 474 if (*known_pool_guid != 0) { 475 if (pool_guid != *known_pool_guid) 476 goto ignore; 477 } else 478 *known_pool_guid = pool_guid; 479 480 resize_configs(configs, count, id); 481 482 if ((*configs)[id] != NULL) { 483 VERIFY(nvlist_lookup_uint64((*configs)[id], 484 ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0); 485 if (txg <= known_txg) 486 goto ignore; 487 nvlist_free((*configs)[id]); 488 } 489 490 (*configs)[id] = cfg; 491 return; 492 493ignore: 494 nvlist_free(cfg); 495} 496 497int 498vdev_geom_read_pool_label(const char *name, 499 nvlist_t ***configs, uint64_t *count) 500{ 501 struct g_class *mp; 502 struct g_geom *gp; 503 struct g_provider *pp; 504 struct g_consumer *zcp; 505 nvlist_t *vdev_cfg; 506 uint64_t pool_guid; 507 int error; 508 509 DROP_GIANT(); 510 g_topology_lock(); 511 512 *configs = NULL; 513 *count = 0; 514 pool_guid = 0; 515 LIST_FOREACH(mp, &g_classes, class) { 516 if (mp == &zfs_vdev_class) 517 continue; 518 LIST_FOREACH(gp, &mp->geom, geom) { 519 if (gp->flags & G_GEOM_WITHER) 520 continue; 521 LIST_FOREACH(pp, &gp->provider, provider) { 522 if (pp->flags & G_PF_WITHER) 523 continue; 524 zcp = vdev_geom_attach(pp, NULL); 525 if (zcp == NULL) 526 continue; 527 g_topology_unlock(); 528 error = vdev_geom_read_config(zcp, &vdev_cfg); 529 g_topology_lock(); 530 vdev_geom_detach(zcp, B_TRUE); 531 if (error) 532 continue; 533 ZFS_LOG(1, "successfully read vdev config"); 534 535 process_vdev_config(configs, count, 536 vdev_cfg, name, &pool_guid); 537 } 538 } 539 } 540 g_topology_unlock(); 541 PICKUP_GIANT(); 542 543 return (*count > 0 ? 0 : ENOENT); 544} 545 546static void 547vdev_geom_read_guids(struct g_consumer *cp, uint64_t *pguid, uint64_t *vguid) 548{ 549 nvlist_t *config; 550 551 g_topology_assert_not(); 552 553 *pguid = 0; 554 *vguid = 0; 555 if (vdev_geom_read_config(cp, &config) == 0) { 556 nvlist_get_guids(config, pguid, vguid); 557 nvlist_free(config); 558 } 559} 560 561static boolean_t 562vdev_attach_ok(vdev_t *vd, struct g_provider *pp) 563{ 564 uint64_t pool_guid; 565 uint64_t vdev_guid; 566 struct g_consumer *zcp; 567 boolean_t pool_ok; 568 boolean_t vdev_ok; 569 570 zcp = vdev_geom_attach(pp, NULL); 571 if (zcp == NULL) { 572 ZFS_LOG(1, "Unable to attach tasting instance to %s.", 573 pp->name); 574 return (B_FALSE); 575 } 576 g_topology_unlock(); 577 vdev_geom_read_guids(zcp, &pool_guid, &vdev_guid); 578 g_topology_lock(); 579 vdev_geom_detach(zcp, B_TRUE); 580 581 /* 582 * Check that the label's vdev guid matches the desired guid. If the 583 * label has a pool guid, check that it matches too. (Inactive spares 584 * and L2ARCs do not have any pool guid in the label.) 585 */ 586 if ((pool_guid == 0 || pool_guid == spa_guid(vd->vdev_spa)) && 587 vdev_guid == vd->vdev_guid) { 588 ZFS_LOG(1, "guids match for provider %s.", vd->vdev_path); 589 return (B_TRUE); 590 } else { 591 ZFS_LOG(1, "guid mismatch for provider %s: " 592 "%ju:%ju != %ju:%ju.", vd->vdev_path, 593 (uintmax_t)spa_guid(vd->vdev_spa), 594 (uintmax_t)vd->vdev_guid, 595 (uintmax_t)pool_guid, (uintmax_t)vdev_guid); 596 return (B_FALSE); 597 } 598} 599 600static struct g_consumer * 601vdev_geom_attach_by_guids(vdev_t *vd) 602{ 603 struct g_class *mp; 604 struct g_geom *gp; 605 struct g_provider *pp; 606 struct g_consumer *cp; 607 608 g_topology_assert(); 609 610 cp = NULL; 611 LIST_FOREACH(mp, &g_classes, class) { 612 if (mp == &zfs_vdev_class) 613 continue; 614 LIST_FOREACH(gp, &mp->geom, geom) { 615 if (gp->flags & G_GEOM_WITHER) 616 continue; 617 LIST_FOREACH(pp, &gp->provider, provider) { 618 if (!vdev_attach_ok(vd, pp)) 619 continue; 620 cp = vdev_geom_attach(pp, vd); 621 if (cp == NULL) { 622 printf("ZFS WARNING: Unable to " 623 "attach to %s.\n", pp->name); 624 continue; 625 } 626 break; 627 } 628 if (cp != NULL) 629 break; 630 } 631 if (cp != NULL) 632 break; 633 } 634end: 635 return (cp); 636} 637 638static struct g_consumer * 639vdev_geom_open_by_guids(vdev_t *vd) 640{ 641 struct g_consumer *cp; 642 char *buf; 643 size_t len; 644 645 g_topology_assert(); 646 647 ZFS_LOG(1, "Searching by guids [%ju:%ju].", 648 (uintmax_t)spa_guid(vd->vdev_spa), (uintmax_t)vd->vdev_guid); 649 cp = vdev_geom_attach_by_guids(vd); 650 if (cp != NULL) { 651 len = strlen(cp->provider->name) + strlen("/dev/") + 1; 652 buf = kmem_alloc(len, KM_SLEEP); 653 654 snprintf(buf, len, "/dev/%s", cp->provider->name); 655 spa_strfree(vd->vdev_path); 656 vd->vdev_path = buf; 657 658 ZFS_LOG(1, "Attach by guid [%ju:%ju] succeeded, provider %s.", 659 (uintmax_t)spa_guid(vd->vdev_spa), 660 (uintmax_t)vd->vdev_guid, vd->vdev_path); 661 } else { 662 ZFS_LOG(1, "Search by guid [%ju:%ju] failed.", 663 (uintmax_t)spa_guid(vd->vdev_spa), 664 (uintmax_t)vd->vdev_guid); 665 } 666 667 return (cp); 668} 669 670static struct g_consumer * 671vdev_geom_open_by_path(vdev_t *vd, int check_guid) 672{ 673 struct g_provider *pp; 674 struct g_consumer *cp; 675 676 g_topology_assert(); 677 678 cp = NULL; 679 pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1); 680 if (pp != NULL) { 681 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path); 682 if (!check_guid || vdev_attach_ok(vd, pp)) 683 cp = vdev_geom_attach(pp, vd); 684 } 685 686 return (cp); 687} 688 689static int 690vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, 691 uint64_t *logical_ashift, uint64_t *physical_ashift) 692{ 693 struct g_provider *pp; 694 struct g_consumer *cp; 695 size_t bufsize; 696 int error; 697 698 /* Set the TLS to indicate downstack that we should not access zvols*/ 699 VERIFY(tsd_set(zfs_geom_probe_vdev_key, vd) == 0); 700 701 /* 702 * We must have a pathname, and it must be absolute. 703 */ 704 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 705 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 706 return (EINVAL); 707 } 708 709 vd->vdev_tsd = NULL; 710 711 DROP_GIANT(); 712 g_topology_lock(); 713 error = 0; 714 715 if (vd->vdev_spa->spa_splitting_newspa || 716 (vd->vdev_prevstate == VDEV_STATE_UNKNOWN && 717 vd->vdev_spa->spa_load_state == SPA_LOAD_NONE || 718 vd->vdev_spa->spa_load_state == SPA_LOAD_CREATE)) { 719 /* 720 * We are dealing with a vdev that hasn't been previously 721 * opened (since boot), and we are not loading an 722 * existing pool configuration. This looks like a 723 * vdev add operation to a new or existing pool. 724 * Assume the user knows what he/she is doing and find 725 * GEOM provider by its name, ignoring GUID mismatches. 726 * 727 * XXPOLICY: It would be safer to only allow a device 728 * that is unlabeled or labeled but missing 729 * GUID information to be opened in this fashion, 730 * unless we are doing a split, in which case we 731 * should allow any guid. 732 */ 733 cp = vdev_geom_open_by_path(vd, 0); 734 } else { 735 /* 736 * Try using the recorded path for this device, but only 737 * accept it if its label data contains the expected GUIDs. 738 */ 739 cp = vdev_geom_open_by_path(vd, 1); 740 if (cp == NULL) { 741 /* 742 * The device at vd->vdev_path doesn't have the 743 * expected GUIDs. The disks might have merely 744 * moved around so try all other GEOM providers 745 * to find one with the right GUIDs. 746 */ 747 cp = vdev_geom_open_by_guids(vd); 748 } 749 } 750 751 /* Clear the TLS now that tasting is done */ 752 VERIFY(tsd_set(zfs_geom_probe_vdev_key, NULL) == 0); 753 754 if (cp == NULL) { 755 ZFS_LOG(1, "Provider %s not found.", vd->vdev_path); 756 error = ENOENT; 757 } else if (cp->provider->sectorsize > VDEV_PAD_SIZE || 758 !ISP2(cp->provider->sectorsize)) { 759 ZFS_LOG(1, "Provider %s has unsupported sectorsize.", 760 vd->vdev_path); 761 762 vdev_geom_close_locked(vd); 763 error = EINVAL; 764 cp = NULL; 765 } else if (cp->acw == 0 && (spa_mode(vd->vdev_spa) & FWRITE) != 0) { 766 int i; 767 768 for (i = 0; i < 5; i++) { 769 error = g_access(cp, 0, 1, 0); 770 if (error == 0) 771 break; 772 g_topology_unlock(); 773 tsleep(vd, 0, "vdev", hz / 2); 774 g_topology_lock(); 775 } 776 if (error != 0) { 777 printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n", 778 vd->vdev_path, error); 779 vdev_geom_close_locked(vd); 780 cp = NULL; 781 } 782 } 783 784 /* Fetch initial physical path information for this device. */ 785 if (cp != NULL) 786 vdev_geom_attrchanged(cp, "GEOM::physpath"); 787 788 g_topology_unlock(); 789 PICKUP_GIANT(); 790 if (cp == NULL) { 791 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 792 return (error); 793 } 794 pp = cp->provider; 795 796 /* 797 * Determine the actual size of the device. 798 */ 799 *max_psize = *psize = pp->mediasize; 800 801 /* 802 * Determine the device's minimum transfer size and preferred 803 * transfer size. 804 */ 805 *logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1; 806 *physical_ashift = 0; 807 if (pp->stripesize > (1 << *logical_ashift) && ISP2(pp->stripesize) && 808 pp->stripesize <= (1 << SPA_MAXASHIFT) && pp->stripeoffset == 0) 809 *physical_ashift = highbit(pp->stripesize) - 1; 810 811 /* 812 * Clear the nowritecache settings, so that on a vdev_reopen() 813 * we will try again. 814 */ 815 vd->vdev_nowritecache = B_FALSE; 816 817 /* 818 * Determine the device's rotation rate. 819 */ 820 vdev_geom_set_rotation_rate(vd, cp); 821 822 return (0); 823} 824 825static void 826vdev_geom_close(vdev_t *vd) 827{ 828 829 DROP_GIANT(); 830 g_topology_lock(); 831 vdev_geom_close_locked(vd); 832 g_topology_unlock(); 833 PICKUP_GIANT(); 834} 835 836static void 837vdev_geom_io_intr(struct bio *bp) 838{ 839 vdev_t *vd; 840 zio_t *zio; 841 842 zio = bp->bio_caller1; 843 vd = zio->io_vd; 844 zio->io_error = bp->bio_error; 845 if (zio->io_error == 0 && bp->bio_resid != 0) 846 zio->io_error = SET_ERROR(EIO); 847 848 switch(zio->io_error) { 849 case ENOTSUP: 850 /* 851 * If we get ENOTSUP for BIO_FLUSH or BIO_DELETE we know 852 * that future attempts will never succeed. In this case 853 * we set a persistent flag so that we don't bother with 854 * requests in the future. 855 */ 856 switch(bp->bio_cmd) { 857 case BIO_FLUSH: 858 vd->vdev_nowritecache = B_TRUE; 859 break; 860 case BIO_DELETE: 861 vd->vdev_notrim = B_TRUE; 862 break; 863 } 864 break; 865 case ENXIO: 866 if (!vd->vdev_remove_wanted) { 867 /* 868 * If provider's error is set we assume it is being 869 * removed. 870 */ 871 if (bp->bio_to->error != 0) { 872 vd->vdev_remove_wanted = B_TRUE; 873 spa_async_request(zio->io_spa, 874 SPA_ASYNC_REMOVE); 875 } else if (!vd->vdev_delayed_close) { 876 vd->vdev_delayed_close = B_TRUE; 877 } 878 } 879 break; 880 } 881 g_destroy_bio(bp); 882 zio_delay_interrupt(zio); 883} 884 885static void 886vdev_geom_io_start(zio_t *zio) 887{ 888 vdev_t *vd; 889 struct g_consumer *cp; 890 struct bio *bp; 891 int error; 892 893 vd = zio->io_vd; 894 895 switch (zio->io_type) { 896 case ZIO_TYPE_IOCTL: 897 /* XXPOLICY */ 898 if (!vdev_readable(vd)) { 899 zio->io_error = SET_ERROR(ENXIO); 900 zio_interrupt(zio); 901 return; 902 } else { 903 switch (zio->io_cmd) { 904 case DKIOCFLUSHWRITECACHE: 905 if (zfs_nocacheflush || vdev_geom_bio_flush_disable) 906 break; 907 if (vd->vdev_nowritecache) { 908 zio->io_error = SET_ERROR(ENOTSUP); 909 break; 910 } 911 goto sendreq; 912 default: 913 zio->io_error = SET_ERROR(ENOTSUP); 914 } 915 } 916 917 zio_execute(zio); 918 return; 919 case ZIO_TYPE_FREE: 920 if (vd->vdev_notrim) { 921 zio->io_error = SET_ERROR(ENOTSUP); 922 } else if (!vdev_geom_bio_delete_disable) { 923 goto sendreq; 924 } 925 zio_execute(zio); 926 return; 927 } 928sendreq: 929 ASSERT(zio->io_type == ZIO_TYPE_READ || 930 zio->io_type == ZIO_TYPE_WRITE || 931 zio->io_type == ZIO_TYPE_FREE || 932 zio->io_type == ZIO_TYPE_IOCTL); 933 934 cp = vd->vdev_tsd; 935 if (cp == NULL) { 936 zio->io_error = SET_ERROR(ENXIO); 937 zio_interrupt(zio); 938 return; 939 } 940 bp = g_alloc_bio(); 941 bp->bio_caller1 = zio; 942 switch (zio->io_type) { 943 case ZIO_TYPE_READ: 944 case ZIO_TYPE_WRITE: 945 zio->io_target_timestamp = zio_handle_io_delay(zio); 946 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE; 947 bp->bio_data = zio->io_data; 948 bp->bio_offset = zio->io_offset; 949 bp->bio_length = zio->io_size; 950 break; 951 case ZIO_TYPE_FREE: 952 bp->bio_cmd = BIO_DELETE; 953 bp->bio_data = NULL; 954 bp->bio_offset = zio->io_offset; 955 bp->bio_length = zio->io_size; 956 break; 957 case ZIO_TYPE_IOCTL: 958 bp->bio_cmd = BIO_FLUSH; 959 bp->bio_flags |= BIO_ORDERED; 960 bp->bio_data = NULL; 961 bp->bio_offset = cp->provider->mediasize; 962 bp->bio_length = 0; 963 break; 964 } 965 bp->bio_done = vdev_geom_io_intr; 966 967 g_io_request(bp, cp); 968} 969 970static void 971vdev_geom_io_done(zio_t *zio) 972{ 973} 974 975static void 976vdev_geom_hold(vdev_t *vd) 977{ 978} 979 980static void 981vdev_geom_rele(vdev_t *vd) 982{ 983} 984 985vdev_ops_t vdev_geom_ops = { 986 vdev_geom_open, 987 vdev_geom_close, 988 vdev_default_asize, 989 vdev_geom_io_start, 990 vdev_geom_io_done, 991 NULL, 992 vdev_geom_hold, 993 vdev_geom_rele, 994 VDEV_TYPE_DISK, /* name of this vdev type */ 995 B_TRUE /* leaf vdev */ 996}; 997