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 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2012 by Delphix. All rights reserved. 26 */ 27 28 #include <sys/zfs_context.h> 29 #include <sys/fm/fs/zfs.h> 30 #include <sys/spa.h> 31 #include <sys/spa_impl.h> 32 #include <sys/dmu.h> 33 #include <sys/dmu_tx.h> 34 #include <sys/vdev_impl.h> 35 #include <sys/uberblock_impl.h> 36 #include <sys/metaslab.h> 37 #include <sys/metaslab_impl.h> 38 #include <sys/space_map.h> 39 #include <sys/zio.h> 40 #include <sys/zap.h> 41 #include <sys/fs/zfs.h> 42 #include <sys/arc.h> 43 #include <sys/zil.h> 44 #include <sys/dsl_scan.h> 45 46 /* 47 * Virtual device management. 48 */ 49 50 static vdev_ops_t *vdev_ops_table[] = { 51 &vdev_root_ops, 52 &vdev_raidz_ops, 53 &vdev_mirror_ops, 54 &vdev_replacing_ops, 55 &vdev_spare_ops, 56 &vdev_disk_ops, 57 &vdev_file_ops, 58 &vdev_missing_ops, 59 &vdev_hole_ops, 60 NULL 61 }; 62 63 /* maximum scrub/resilver I/O queue per leaf vdev */ 64 int zfs_scrub_limit = 10; 65 66 /* 67 * Given a vdev type, return the appropriate ops vector. 68 */ 69 static vdev_ops_t * 70 vdev_getops(const char *type) 71 { 72 vdev_ops_t *ops, **opspp; 73 74 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 75 if (strcmp(ops->vdev_op_type, type) == 0) 76 break; 77 78 return (ops); 79 } 80 81 /* 82 * Default asize function: return the MAX of psize with the asize of 83 * all children. This is what's used by anything other than RAID-Z. 84 */ 85 uint64_t 86 vdev_default_asize(vdev_t *vd, uint64_t psize) 87 { 88 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 89 uint64_t csize; 90 91 for (int c = 0; c < vd->vdev_children; c++) { 92 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 93 asize = MAX(asize, csize); 94 } 95 96 return (asize); 97 } 98 99 /* 100 * Get the minimum allocatable size. We define the allocatable size as 101 * the vdev's asize rounded to the nearest metaslab. This allows us to 102 * replace or attach devices which don't have the same physical size but 103 * can still satisfy the same number of allocations. 104 */ 105 uint64_t 106 vdev_get_min_asize(vdev_t *vd) 107 { 108 vdev_t *pvd = vd->vdev_parent; 109 110 /* 111 * If our parent is NULL (inactive spare or cache) or is the root, 112 * just return our own asize. 113 */ 114 if (pvd == NULL) 115 return (vd->vdev_asize); 116 117 /* 118 * The top-level vdev just returns the allocatable size rounded 119 * to the nearest metaslab. 120 */ 121 if (vd == vd->vdev_top) 122 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 123 124 /* 125 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 126 * so each child must provide at least 1/Nth of its asize. 127 */ 128 if (pvd->vdev_ops == &vdev_raidz_ops) 129 return (pvd->vdev_min_asize / pvd->vdev_children); 130 131 return (pvd->vdev_min_asize); 132 } 133 134 void 135 vdev_set_min_asize(vdev_t *vd) 136 { 137 vd->vdev_min_asize = vdev_get_min_asize(vd); 138 139 for (int c = 0; c < vd->vdev_children; c++) 140 vdev_set_min_asize(vd->vdev_child[c]); 141 } 142 143 vdev_t * 144 vdev_lookup_top(spa_t *spa, uint64_t vdev) 145 { 146 vdev_t *rvd = spa->spa_root_vdev; 147 148 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 149 150 if (vdev < rvd->vdev_children) { 151 ASSERT(rvd->vdev_child[vdev] != NULL); 152 return (rvd->vdev_child[vdev]); 153 } 154 155 return (NULL); 156 } 157 158 vdev_t * 159 vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 160 { 161 vdev_t *mvd; 162 163 if (vd->vdev_guid == guid) 164 return (vd); 165 166 for (int c = 0; c < vd->vdev_children; c++) 167 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 168 NULL) 169 return (mvd); 170 171 return (NULL); 172 } 173 174 void 175 vdev_add_child(vdev_t *pvd, vdev_t *cvd) 176 { 177 size_t oldsize, newsize; 178 uint64_t id = cvd->vdev_id; 179 vdev_t **newchild; 180 181 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 182 ASSERT(cvd->vdev_parent == NULL); 183 184 cvd->vdev_parent = pvd; 185 186 if (pvd == NULL) 187 return; 188 189 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 190 191 oldsize = pvd->vdev_children * sizeof (vdev_t *); 192 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 193 newsize = pvd->vdev_children * sizeof (vdev_t *); 194 195 newchild = kmem_zalloc(newsize, KM_SLEEP); 196 if (pvd->vdev_child != NULL) { 197 bcopy(pvd->vdev_child, newchild, oldsize); 198 kmem_free(pvd->vdev_child, oldsize); 199 } 200 201 pvd->vdev_child = newchild; 202 pvd->vdev_child[id] = cvd; 203 204 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 205 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 206 207 /* 208 * Walk up all ancestors to update guid sum. 209 */ 210 for (; pvd != NULL; pvd = pvd->vdev_parent) 211 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 212 } 213 214 void 215 vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 216 { 217 int c; 218 uint_t id = cvd->vdev_id; 219 220 ASSERT(cvd->vdev_parent == pvd); 221 222 if (pvd == NULL) 223 return; 224 225 ASSERT(id < pvd->vdev_children); 226 ASSERT(pvd->vdev_child[id] == cvd); 227 228 pvd->vdev_child[id] = NULL; 229 cvd->vdev_parent = NULL; 230 231 for (c = 0; c < pvd->vdev_children; c++) 232 if (pvd->vdev_child[c]) 233 break; 234 235 if (c == pvd->vdev_children) { 236 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 237 pvd->vdev_child = NULL; 238 pvd->vdev_children = 0; 239 } 240 241 /* 242 * Walk up all ancestors to update guid sum. 243 */ 244 for (; pvd != NULL; pvd = pvd->vdev_parent) 245 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 246 } 247 248 /* 249 * Remove any holes in the child array. 250 */ 251 void 252 vdev_compact_children(vdev_t *pvd) 253 { 254 vdev_t **newchild, *cvd; 255 int oldc = pvd->vdev_children; 256 int newc; 257 258 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 259 260 for (int c = newc = 0; c < oldc; c++) 261 if (pvd->vdev_child[c]) 262 newc++; 263 264 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 265 266 for (int c = newc = 0; c < oldc; c++) { 267 if ((cvd = pvd->vdev_child[c]) != NULL) { 268 newchild[newc] = cvd; 269 cvd->vdev_id = newc++; 270 } 271 } 272 273 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 274 pvd->vdev_child = newchild; 275 pvd->vdev_children = newc; 276 } 277 278 /* 279 * Allocate and minimally initialize a vdev_t. 280 */ 281 vdev_t * 282 vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 283 { 284 vdev_t *vd; 285 286 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 287 288 if (spa->spa_root_vdev == NULL) { 289 ASSERT(ops == &vdev_root_ops); 290 spa->spa_root_vdev = vd; 291 spa->spa_load_guid = spa_generate_guid(NULL); 292 } 293 294 if (guid == 0 && ops != &vdev_hole_ops) { 295 if (spa->spa_root_vdev == vd) { 296 /* 297 * The root vdev's guid will also be the pool guid, 298 * which must be unique among all pools. 299 */ 300 guid = spa_generate_guid(NULL); 301 } else { 302 /* 303 * Any other vdev's guid must be unique within the pool. 304 */ 305 guid = spa_generate_guid(spa); 306 } 307 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 308 } 309 310 vd->vdev_spa = spa; 311 vd->vdev_id = id; 312 vd->vdev_guid = guid; 313 vd->vdev_guid_sum = guid; 314 vd->vdev_ops = ops; 315 vd->vdev_state = VDEV_STATE_CLOSED; 316 vd->vdev_ishole = (ops == &vdev_hole_ops); 317 318 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 319 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 320 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 321 for (int t = 0; t < DTL_TYPES; t++) { 322 space_map_create(&vd->vdev_dtl[t], 0, -1ULL, 0, 323 &vd->vdev_dtl_lock); 324 } 325 txg_list_create(&vd->vdev_ms_list, 326 offsetof(struct metaslab, ms_txg_node)); 327 txg_list_create(&vd->vdev_dtl_list, 328 offsetof(struct vdev, vdev_dtl_node)); 329 vd->vdev_stat.vs_timestamp = gethrtime(); 330 vdev_queue_init(vd); 331 vdev_cache_init(vd); 332 333 return (vd); 334 } 335 336 /* 337 * Allocate a new vdev. The 'alloctype' is used to control whether we are 338 * creating a new vdev or loading an existing one - the behavior is slightly 339 * different for each case. 340 */ 341 int 342 vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 343 int alloctype) 344 { 345 vdev_ops_t *ops; 346 char *type; 347 uint64_t guid = 0, islog, nparity; 348 vdev_t *vd; 349 350 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 351 352 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 353 return (EINVAL); 354 355 if ((ops = vdev_getops(type)) == NULL) 356 return (EINVAL); 357 358 /* 359 * If this is a load, get the vdev guid from the nvlist. 360 * Otherwise, vdev_alloc_common() will generate one for us. 361 */ 362 if (alloctype == VDEV_ALLOC_LOAD) { 363 uint64_t label_id; 364 365 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 366 label_id != id) 367 return (EINVAL); 368 369 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 370 return (EINVAL); 371 } else if (alloctype == VDEV_ALLOC_SPARE) { 372 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 373 return (EINVAL); 374 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 375 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 376 return (EINVAL); 377 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 378 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 379 return (EINVAL); 380 } 381 382 /* 383 * The first allocated vdev must be of type 'root'. 384 */ 385 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 386 return (EINVAL); 387 388 /* 389 * Determine whether we're a log vdev. 390 */ 391 islog = 0; 392 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 393 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 394 return (ENOTSUP); 395 396 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 397 return (ENOTSUP); 398 399 /* 400 * Set the nparity property for RAID-Z vdevs. 401 */ 402 nparity = -1ULL; 403 if (ops == &vdev_raidz_ops) { 404 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 405 &nparity) == 0) { 406 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 407 return (EINVAL); 408 /* 409 * Previous versions could only support 1 or 2 parity 410 * device. 411 */ 412 if (nparity > 1 && 413 spa_version(spa) < SPA_VERSION_RAIDZ2) 414 return (ENOTSUP); 415 if (nparity > 2 && 416 spa_version(spa) < SPA_VERSION_RAIDZ3) 417 return (ENOTSUP); 418 } else { 419 /* 420 * We require the parity to be specified for SPAs that 421 * support multiple parity levels. 422 */ 423 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 424 return (EINVAL); 425 /* 426 * Otherwise, we default to 1 parity device for RAID-Z. 427 */ 428 nparity = 1; 429 } 430 } else { 431 nparity = 0; 432 } 433 ASSERT(nparity != -1ULL); 434 435 vd = vdev_alloc_common(spa, id, guid, ops); 436 437 vd->vdev_islog = islog; 438 vd->vdev_nparity = nparity; 439 440 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 441 vd->vdev_path = spa_strdup(vd->vdev_path); 442 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 443 vd->vdev_devid = spa_strdup(vd->vdev_devid); 444 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 445 &vd->vdev_physpath) == 0) 446 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 447 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 448 vd->vdev_fru = spa_strdup(vd->vdev_fru); 449 450 /* 451 * Set the whole_disk property. If it's not specified, leave the value 452 * as -1. 453 */ 454 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 455 &vd->vdev_wholedisk) != 0) 456 vd->vdev_wholedisk = -1ULL; 457 458 /* 459 * Look for the 'not present' flag. This will only be set if the device 460 * was not present at the time of import. 461 */ 462 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 463 &vd->vdev_not_present); 464 465 /* 466 * Get the alignment requirement. 467 */ 468 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 469 470 /* 471 * Retrieve the vdev creation time. 472 */ 473 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 474 &vd->vdev_crtxg); 475 476 /* 477 * If we're a top-level vdev, try to load the allocation parameters. 478 */ 479 if (parent && !parent->vdev_parent && 480 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 481 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 482 &vd->vdev_ms_array); 483 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 484 &vd->vdev_ms_shift); 485 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 486 &vd->vdev_asize); 487 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 488 &vd->vdev_removing); 489 } 490 491 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 492 ASSERT(alloctype == VDEV_ALLOC_LOAD || 493 alloctype == VDEV_ALLOC_ADD || 494 alloctype == VDEV_ALLOC_SPLIT || 495 alloctype == VDEV_ALLOC_ROOTPOOL); 496 vd->vdev_mg = metaslab_group_create(islog ? 497 spa_log_class(spa) : spa_normal_class(spa), vd); 498 } 499 500 /* 501 * If we're a leaf vdev, try to load the DTL object and other state. 502 */ 503 if (vd->vdev_ops->vdev_op_leaf && 504 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 505 alloctype == VDEV_ALLOC_ROOTPOOL)) { 506 if (alloctype == VDEV_ALLOC_LOAD) { 507 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 508 &vd->vdev_dtl_smo.smo_object); 509 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 510 &vd->vdev_unspare); 511 } 512 513 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 514 uint64_t spare = 0; 515 516 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 517 &spare) == 0 && spare) 518 spa_spare_add(vd); 519 } 520 521 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 522 &vd->vdev_offline); 523 524 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVERING, 525 &vd->vdev_resilvering); 526 527 /* 528 * When importing a pool, we want to ignore the persistent fault 529 * state, as the diagnosis made on another system may not be 530 * valid in the current context. Local vdevs will 531 * remain in the faulted state. 532 */ 533 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 534 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 535 &vd->vdev_faulted); 536 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 537 &vd->vdev_degraded); 538 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 539 &vd->vdev_removed); 540 541 if (vd->vdev_faulted || vd->vdev_degraded) { 542 char *aux; 543 544 vd->vdev_label_aux = 545 VDEV_AUX_ERR_EXCEEDED; 546 if (nvlist_lookup_string(nv, 547 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 548 strcmp(aux, "external") == 0) 549 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 550 } 551 } 552 } 553 554 /* 555 * Add ourselves to the parent's list of children. 556 */ 557 vdev_add_child(parent, vd); 558 559 *vdp = vd; 560 561 return (0); 562 } 563 564 void 565 vdev_free(vdev_t *vd) 566 { 567 spa_t *spa = vd->vdev_spa; 568 569 /* 570 * vdev_free() implies closing the vdev first. This is simpler than 571 * trying to ensure complicated semantics for all callers. 572 */ 573 vdev_close(vd); 574 575 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 576 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 577 578 /* 579 * Free all children. 580 */ 581 for (int c = 0; c < vd->vdev_children; c++) 582 vdev_free(vd->vdev_child[c]); 583 584 ASSERT(vd->vdev_child == NULL); 585 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 586 587 /* 588 * Discard allocation state. 589 */ 590 if (vd->vdev_mg != NULL) { 591 vdev_metaslab_fini(vd); 592 metaslab_group_destroy(vd->vdev_mg); 593 } 594 595 ASSERT0(vd->vdev_stat.vs_space); 596 ASSERT0(vd->vdev_stat.vs_dspace); 597 ASSERT0(vd->vdev_stat.vs_alloc); 598 599 /* 600 * Remove this vdev from its parent's child list. 601 */ 602 vdev_remove_child(vd->vdev_parent, vd); 603 604 ASSERT(vd->vdev_parent == NULL); 605 606 /* 607 * Clean up vdev structure. 608 */ 609 vdev_queue_fini(vd); 610 vdev_cache_fini(vd); 611 612 if (vd->vdev_path) 613 spa_strfree(vd->vdev_path); 614 if (vd->vdev_devid) 615 spa_strfree(vd->vdev_devid); 616 if (vd->vdev_physpath) 617 spa_strfree(vd->vdev_physpath); 618 if (vd->vdev_fru) 619 spa_strfree(vd->vdev_fru); 620 621 if (vd->vdev_isspare) 622 spa_spare_remove(vd); 623 if (vd->vdev_isl2cache) 624 spa_l2cache_remove(vd); 625 626 txg_list_destroy(&vd->vdev_ms_list); 627 txg_list_destroy(&vd->vdev_dtl_list); 628 629 mutex_enter(&vd->vdev_dtl_lock); 630 for (int t = 0; t < DTL_TYPES; t++) { 631 space_map_unload(&vd->vdev_dtl[t]); 632 space_map_destroy(&vd->vdev_dtl[t]); 633 } 634 mutex_exit(&vd->vdev_dtl_lock); 635 636 mutex_destroy(&vd->vdev_dtl_lock); 637 mutex_destroy(&vd->vdev_stat_lock); 638 mutex_destroy(&vd->vdev_probe_lock); 639 640 if (vd == spa->spa_root_vdev) 641 spa->spa_root_vdev = NULL; 642 643 kmem_free(vd, sizeof (vdev_t)); 644 } 645 646 /* 647 * Transfer top-level vdev state from svd to tvd. 648 */ 649 static void 650 vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 651 { 652 spa_t *spa = svd->vdev_spa; 653 metaslab_t *msp; 654 vdev_t *vd; 655 int t; 656 657 ASSERT(tvd == tvd->vdev_top); 658 659 tvd->vdev_ms_array = svd->vdev_ms_array; 660 tvd->vdev_ms_shift = svd->vdev_ms_shift; 661 tvd->vdev_ms_count = svd->vdev_ms_count; 662 663 svd->vdev_ms_array = 0; 664 svd->vdev_ms_shift = 0; 665 svd->vdev_ms_count = 0; 666 667 if (tvd->vdev_mg) 668 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 669 tvd->vdev_mg = svd->vdev_mg; 670 tvd->vdev_ms = svd->vdev_ms; 671 672 svd->vdev_mg = NULL; 673 svd->vdev_ms = NULL; 674 675 if (tvd->vdev_mg != NULL) 676 tvd->vdev_mg->mg_vd = tvd; 677 678 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 679 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 680 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 681 682 svd->vdev_stat.vs_alloc = 0; 683 svd->vdev_stat.vs_space = 0; 684 svd->vdev_stat.vs_dspace = 0; 685 686 for (t = 0; t < TXG_SIZE; t++) { 687 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 688 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 689 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 690 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 691 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 692 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 693 } 694 695 if (list_link_active(&svd->vdev_config_dirty_node)) { 696 vdev_config_clean(svd); 697 vdev_config_dirty(tvd); 698 } 699 700 if (list_link_active(&svd->vdev_state_dirty_node)) { 701 vdev_state_clean(svd); 702 vdev_state_dirty(tvd); 703 } 704 705 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 706 svd->vdev_deflate_ratio = 0; 707 708 tvd->vdev_islog = svd->vdev_islog; 709 svd->vdev_islog = 0; 710 } 711 712 static void 713 vdev_top_update(vdev_t *tvd, vdev_t *vd) 714 { 715 if (vd == NULL) 716 return; 717 718 vd->vdev_top = tvd; 719 720 for (int c = 0; c < vd->vdev_children; c++) 721 vdev_top_update(tvd, vd->vdev_child[c]); 722 } 723 724 /* 725 * Add a mirror/replacing vdev above an existing vdev. 726 */ 727 vdev_t * 728 vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 729 { 730 spa_t *spa = cvd->vdev_spa; 731 vdev_t *pvd = cvd->vdev_parent; 732 vdev_t *mvd; 733 734 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 735 736 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 737 738 mvd->vdev_asize = cvd->vdev_asize; 739 mvd->vdev_min_asize = cvd->vdev_min_asize; 740 mvd->vdev_max_asize = cvd->vdev_max_asize; 741 mvd->vdev_ashift = cvd->vdev_ashift; 742 mvd->vdev_state = cvd->vdev_state; 743 mvd->vdev_crtxg = cvd->vdev_crtxg; 744 745 vdev_remove_child(pvd, cvd); 746 vdev_add_child(pvd, mvd); 747 cvd->vdev_id = mvd->vdev_children; 748 vdev_add_child(mvd, cvd); 749 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 750 751 if (mvd == mvd->vdev_top) 752 vdev_top_transfer(cvd, mvd); 753 754 return (mvd); 755 } 756 757 /* 758 * Remove a 1-way mirror/replacing vdev from the tree. 759 */ 760 void 761 vdev_remove_parent(vdev_t *cvd) 762 { 763 vdev_t *mvd = cvd->vdev_parent; 764 vdev_t *pvd = mvd->vdev_parent; 765 766 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 767 768 ASSERT(mvd->vdev_children == 1); 769 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 770 mvd->vdev_ops == &vdev_replacing_ops || 771 mvd->vdev_ops == &vdev_spare_ops); 772 cvd->vdev_ashift = mvd->vdev_ashift; 773 774 vdev_remove_child(mvd, cvd); 775 vdev_remove_child(pvd, mvd); 776 777 /* 778 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 779 * Otherwise, we could have detached an offline device, and when we 780 * go to import the pool we'll think we have two top-level vdevs, 781 * instead of a different version of the same top-level vdev. 782 */ 783 if (mvd->vdev_top == mvd) { 784 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 785 cvd->vdev_orig_guid = cvd->vdev_guid; 786 cvd->vdev_guid += guid_delta; 787 cvd->vdev_guid_sum += guid_delta; 788 } 789 cvd->vdev_id = mvd->vdev_id; 790 vdev_add_child(pvd, cvd); 791 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 792 793 if (cvd == cvd->vdev_top) 794 vdev_top_transfer(mvd, cvd); 795 796 ASSERT(mvd->vdev_children == 0); 797 vdev_free(mvd); 798 } 799 800 int 801 vdev_metaslab_init(vdev_t *vd, uint64_t txg) 802 { 803 spa_t *spa = vd->vdev_spa; 804 objset_t *mos = spa->spa_meta_objset; 805 uint64_t m; 806 uint64_t oldc = vd->vdev_ms_count; 807 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 808 metaslab_t **mspp; 809 int error; 810 811 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 812 813 /* 814 * This vdev is not being allocated from yet or is a hole. 815 */ 816 if (vd->vdev_ms_shift == 0) 817 return (0); 818 819 ASSERT(!vd->vdev_ishole); 820 821 /* 822 * Compute the raidz-deflation ratio. Note, we hard-code 823 * in 128k (1 << 17) because it is the current "typical" blocksize. 824 * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change, 825 * or we will inconsistently account for existing bp's. 826 */ 827 vd->vdev_deflate_ratio = (1 << 17) / 828 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 829 830 ASSERT(oldc <= newc); 831 832 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 833 834 if (oldc != 0) { 835 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 836 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 837 } 838 839 vd->vdev_ms = mspp; 840 vd->vdev_ms_count = newc; 841 842 for (m = oldc; m < newc; m++) { 843 space_map_obj_t smo = { 0, 0, 0 }; 844 if (txg == 0) { 845 uint64_t object = 0; 846 error = dmu_read(mos, vd->vdev_ms_array, 847 m * sizeof (uint64_t), sizeof (uint64_t), &object, 848 DMU_READ_PREFETCH); 849 if (error) 850 return (error); 851 if (object != 0) { 852 dmu_buf_t *db; 853 error = dmu_bonus_hold(mos, object, FTAG, &db); 854 if (error) 855 return (error); 856 ASSERT3U(db->db_size, >=, sizeof (smo)); 857 bcopy(db->db_data, &smo, sizeof (smo)); 858 ASSERT3U(smo.smo_object, ==, object); 859 dmu_buf_rele(db, FTAG); 860 } 861 } 862 vd->vdev_ms[m] = metaslab_init(vd->vdev_mg, &smo, 863 m << vd->vdev_ms_shift, 1ULL << vd->vdev_ms_shift, txg); 864 } 865 866 if (txg == 0) 867 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 868 869 /* 870 * If the vdev is being removed we don't activate 871 * the metaslabs since we want to ensure that no new 872 * allocations are performed on this device. 873 */ 874 if (oldc == 0 && !vd->vdev_removing) 875 metaslab_group_activate(vd->vdev_mg); 876 877 if (txg == 0) 878 spa_config_exit(spa, SCL_ALLOC, FTAG); 879 880 return (0); 881 } 882 883 void 884 vdev_metaslab_fini(vdev_t *vd) 885 { 886 uint64_t m; 887 uint64_t count = vd->vdev_ms_count; 888 889 if (vd->vdev_ms != NULL) { 890 metaslab_group_passivate(vd->vdev_mg); 891 for (m = 0; m < count; m++) 892 if (vd->vdev_ms[m] != NULL) 893 metaslab_fini(vd->vdev_ms[m]); 894 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 895 vd->vdev_ms = NULL; 896 } 897 } 898 899 typedef struct vdev_probe_stats { 900 boolean_t vps_readable; 901 boolean_t vps_writeable; 902 int vps_flags; 903 } vdev_probe_stats_t; 904 905 static void 906 vdev_probe_done(zio_t *zio) 907 { 908 spa_t *spa = zio->io_spa; 909 vdev_t *vd = zio->io_vd; 910 vdev_probe_stats_t *vps = zio->io_private; 911 912 ASSERT(vd->vdev_probe_zio != NULL); 913 914 if (zio->io_type == ZIO_TYPE_READ) { 915 if (zio->io_error == 0) 916 vps->vps_readable = 1; 917 if (zio->io_error == 0 && spa_writeable(spa)) { 918 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 919 zio->io_offset, zio->io_size, zio->io_data, 920 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 921 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 922 } else { 923 zio_buf_free(zio->io_data, zio->io_size); 924 } 925 } else if (zio->io_type == ZIO_TYPE_WRITE) { 926 if (zio->io_error == 0) 927 vps->vps_writeable = 1; 928 zio_buf_free(zio->io_data, zio->io_size); 929 } else if (zio->io_type == ZIO_TYPE_NULL) { 930 zio_t *pio; 931 932 vd->vdev_cant_read |= !vps->vps_readable; 933 vd->vdev_cant_write |= !vps->vps_writeable; 934 935 if (vdev_readable(vd) && 936 (vdev_writeable(vd) || !spa_writeable(spa))) { 937 zio->io_error = 0; 938 } else { 939 ASSERT(zio->io_error != 0); 940 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 941 spa, vd, NULL, 0, 0); 942 zio->io_error = ENXIO; 943 } 944 945 mutex_enter(&vd->vdev_probe_lock); 946 ASSERT(vd->vdev_probe_zio == zio); 947 vd->vdev_probe_zio = NULL; 948 mutex_exit(&vd->vdev_probe_lock); 949 950 while ((pio = zio_walk_parents(zio)) != NULL) 951 if (!vdev_accessible(vd, pio)) 952 pio->io_error = ENXIO; 953 954 kmem_free(vps, sizeof (*vps)); 955 } 956 } 957 958 /* 959 * Determine whether this device is accessible by reading and writing 960 * to several known locations: the pad regions of each vdev label 961 * but the first (which we leave alone in case it contains a VTOC). 962 */ 963 zio_t * 964 vdev_probe(vdev_t *vd, zio_t *zio) 965 { 966 spa_t *spa = vd->vdev_spa; 967 vdev_probe_stats_t *vps = NULL; 968 zio_t *pio; 969 970 ASSERT(vd->vdev_ops->vdev_op_leaf); 971 972 /* 973 * Don't probe the probe. 974 */ 975 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 976 return (NULL); 977 978 /* 979 * To prevent 'probe storms' when a device fails, we create 980 * just one probe i/o at a time. All zios that want to probe 981 * this vdev will become parents of the probe io. 982 */ 983 mutex_enter(&vd->vdev_probe_lock); 984 985 if ((pio = vd->vdev_probe_zio) == NULL) { 986 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 987 988 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 989 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 990 ZIO_FLAG_TRYHARD; 991 992 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 993 /* 994 * vdev_cant_read and vdev_cant_write can only 995 * transition from TRUE to FALSE when we have the 996 * SCL_ZIO lock as writer; otherwise they can only 997 * transition from FALSE to TRUE. This ensures that 998 * any zio looking at these values can assume that 999 * failures persist for the life of the I/O. That's 1000 * important because when a device has intermittent 1001 * connectivity problems, we want to ensure that 1002 * they're ascribed to the device (ENXIO) and not 1003 * the zio (EIO). 1004 * 1005 * Since we hold SCL_ZIO as writer here, clear both 1006 * values so the probe can reevaluate from first 1007 * principles. 1008 */ 1009 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1010 vd->vdev_cant_read = B_FALSE; 1011 vd->vdev_cant_write = B_FALSE; 1012 } 1013 1014 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1015 vdev_probe_done, vps, 1016 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1017 1018 /* 1019 * We can't change the vdev state in this context, so we 1020 * kick off an async task to do it on our behalf. 1021 */ 1022 if (zio != NULL) { 1023 vd->vdev_probe_wanted = B_TRUE; 1024 spa_async_request(spa, SPA_ASYNC_PROBE); 1025 } 1026 } 1027 1028 if (zio != NULL) 1029 zio_add_child(zio, pio); 1030 1031 mutex_exit(&vd->vdev_probe_lock); 1032 1033 if (vps == NULL) { 1034 ASSERT(zio != NULL); 1035 return (NULL); 1036 } 1037 1038 for (int l = 1; l < VDEV_LABELS; l++) { 1039 zio_nowait(zio_read_phys(pio, vd, 1040 vdev_label_offset(vd->vdev_psize, l, 1041 offsetof(vdev_label_t, vl_pad2)), 1042 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1043 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1044 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1045 } 1046 1047 if (zio == NULL) 1048 return (pio); 1049 1050 zio_nowait(pio); 1051 return (NULL); 1052 } 1053 1054 static void 1055 vdev_open_child(void *arg) 1056 { 1057 vdev_t *vd = arg; 1058 1059 vd->vdev_open_thread = curthread; 1060 vd->vdev_open_error = vdev_open(vd); 1061 vd->vdev_open_thread = NULL; 1062 } 1063 1064 boolean_t 1065 vdev_uses_zvols(vdev_t *vd) 1066 { 1067 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1068 strlen(ZVOL_DIR)) == 0) 1069 return (B_TRUE); 1070 for (int c = 0; c < vd->vdev_children; c++) 1071 if (vdev_uses_zvols(vd->vdev_child[c])) 1072 return (B_TRUE); 1073 return (B_FALSE); 1074 } 1075 1076 void 1077 vdev_open_children(vdev_t *vd) 1078 { 1079 taskq_t *tq; 1080 int children = vd->vdev_children; 1081 1082 /* 1083 * in order to handle pools on top of zvols, do the opens 1084 * in a single thread so that the same thread holds the 1085 * spa_namespace_lock 1086 */ 1087 if (vdev_uses_zvols(vd)) { 1088 for (int c = 0; c < children; c++) 1089 vd->vdev_child[c]->vdev_open_error = 1090 vdev_open(vd->vdev_child[c]); 1091 return; 1092 } 1093 tq = taskq_create("vdev_open", children, minclsyspri, 1094 children, children, TASKQ_PREPOPULATE); 1095 1096 for (int c = 0; c < children; c++) 1097 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1098 TQ_SLEEP) != NULL); 1099 1100 taskq_destroy(tq); 1101 } 1102 1103 /* 1104 * Prepare a virtual device for access. 1105 */ 1106 int 1107 vdev_open(vdev_t *vd) 1108 { 1109 spa_t *spa = vd->vdev_spa; 1110 int error; 1111 uint64_t osize = 0; 1112 uint64_t max_osize = 0; 1113 uint64_t asize, max_asize, psize; 1114 uint64_t ashift = 0; 1115 1116 ASSERT(vd->vdev_open_thread == curthread || 1117 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1118 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1119 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1120 vd->vdev_state == VDEV_STATE_OFFLINE); 1121 1122 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1123 vd->vdev_cant_read = B_FALSE; 1124 vd->vdev_cant_write = B_FALSE; 1125 vd->vdev_min_asize = vdev_get_min_asize(vd); 1126 1127 /* 1128 * If this vdev is not removed, check its fault status. If it's 1129 * faulted, bail out of the open. 1130 */ 1131 if (!vd->vdev_removed && vd->vdev_faulted) { 1132 ASSERT(vd->vdev_children == 0); 1133 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1134 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1135 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1136 vd->vdev_label_aux); 1137 return (ENXIO); 1138 } else if (vd->vdev_offline) { 1139 ASSERT(vd->vdev_children == 0); 1140 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1141 return (ENXIO); 1142 } 1143 1144 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, &ashift); 1145 1146 /* 1147 * Reset the vdev_reopening flag so that we actually close 1148 * the vdev on error. 1149 */ 1150 vd->vdev_reopening = B_FALSE; 1151 if (zio_injection_enabled && error == 0) 1152 error = zio_handle_device_injection(vd, NULL, ENXIO); 1153 1154 if (error) { 1155 if (vd->vdev_removed && 1156 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1157 vd->vdev_removed = B_FALSE; 1158 1159 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1160 vd->vdev_stat.vs_aux); 1161 return (error); 1162 } 1163 1164 vd->vdev_removed = B_FALSE; 1165 1166 /* 1167 * Recheck the faulted flag now that we have confirmed that 1168 * the vdev is accessible. If we're faulted, bail. 1169 */ 1170 if (vd->vdev_faulted) { 1171 ASSERT(vd->vdev_children == 0); 1172 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1173 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1174 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1175 vd->vdev_label_aux); 1176 return (ENXIO); 1177 } 1178 1179 if (vd->vdev_degraded) { 1180 ASSERT(vd->vdev_children == 0); 1181 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1182 VDEV_AUX_ERR_EXCEEDED); 1183 } else { 1184 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1185 } 1186 1187 /* 1188 * For hole or missing vdevs we just return success. 1189 */ 1190 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1191 return (0); 1192 1193 for (int c = 0; c < vd->vdev_children; c++) { 1194 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1195 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1196 VDEV_AUX_NONE); 1197 break; 1198 } 1199 } 1200 1201 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1202 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1203 1204 if (vd->vdev_children == 0) { 1205 if (osize < SPA_MINDEVSIZE) { 1206 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1207 VDEV_AUX_TOO_SMALL); 1208 return (EOVERFLOW); 1209 } 1210 psize = osize; 1211 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1212 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1213 VDEV_LABEL_END_SIZE); 1214 } else { 1215 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1216 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1217 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1218 VDEV_AUX_TOO_SMALL); 1219 return (EOVERFLOW); 1220 } 1221 psize = 0; 1222 asize = osize; 1223 max_asize = max_osize; 1224 } 1225 1226 vd->vdev_psize = psize; 1227 1228 /* 1229 * Make sure the allocatable size hasn't shrunk. 1230 */ 1231 if (asize < vd->vdev_min_asize) { 1232 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1233 VDEV_AUX_BAD_LABEL); 1234 return (EINVAL); 1235 } 1236 1237 if (vd->vdev_asize == 0) { 1238 /* 1239 * This is the first-ever open, so use the computed values. 1240 * For testing purposes, a higher ashift can be requested. 1241 */ 1242 vd->vdev_asize = asize; 1243 vd->vdev_max_asize = max_asize; 1244 vd->vdev_ashift = MAX(ashift, vd->vdev_ashift); 1245 } else { 1246 /* 1247 * Detect if the alignment requirement has increased. 1248 * We don't want to make the pool unavailable, just 1249 * issue a warning instead. 1250 */ 1251 if (ashift > vd->vdev_top->vdev_ashift && 1252 vd->vdev_ops->vdev_op_leaf) { 1253 cmn_err(CE_WARN, 1254 "Disk, '%s', has a block alignment that is " 1255 "larger than the pool's alignment\n", 1256 vd->vdev_path); 1257 } 1258 vd->vdev_max_asize = max_asize; 1259 } 1260 1261 /* 1262 * If all children are healthy and the asize has increased, 1263 * then we've experienced dynamic LUN growth. If automatic 1264 * expansion is enabled then use the additional space. 1265 */ 1266 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1267 (vd->vdev_expanding || spa->spa_autoexpand)) 1268 vd->vdev_asize = asize; 1269 1270 vdev_set_min_asize(vd); 1271 1272 /* 1273 * Ensure we can issue some IO before declaring the 1274 * vdev open for business. 1275 */ 1276 if (vd->vdev_ops->vdev_op_leaf && 1277 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1278 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1279 VDEV_AUX_ERR_EXCEEDED); 1280 return (error); 1281 } 1282 1283 /* 1284 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1285 * resilver. But don't do this if we are doing a reopen for a scrub, 1286 * since this would just restart the scrub we are already doing. 1287 */ 1288 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1289 vdev_resilver_needed(vd, NULL, NULL)) 1290 spa_async_request(spa, SPA_ASYNC_RESILVER); 1291 1292 return (0); 1293 } 1294 1295 /* 1296 * Called once the vdevs are all opened, this routine validates the label 1297 * contents. This needs to be done before vdev_load() so that we don't 1298 * inadvertently do repair I/Os to the wrong device. 1299 * 1300 * If 'strict' is false ignore the spa guid check. This is necessary because 1301 * if the machine crashed during a re-guid the new guid might have been written 1302 * to all of the vdev labels, but not the cached config. The strict check 1303 * will be performed when the pool is opened again using the mos config. 1304 * 1305 * This function will only return failure if one of the vdevs indicates that it 1306 * has since been destroyed or exported. This is only possible if 1307 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1308 * will be updated but the function will return 0. 1309 */ 1310 int 1311 vdev_validate(vdev_t *vd, boolean_t strict) 1312 { 1313 spa_t *spa = vd->vdev_spa; 1314 nvlist_t *label; 1315 uint64_t guid = 0, top_guid; 1316 uint64_t state; 1317 1318 for (int c = 0; c < vd->vdev_children; c++) 1319 if (vdev_validate(vd->vdev_child[c], strict) != 0) 1320 return (EBADF); 1321 1322 /* 1323 * If the device has already failed, or was marked offline, don't do 1324 * any further validation. Otherwise, label I/O will fail and we will 1325 * overwrite the previous state. 1326 */ 1327 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1328 uint64_t aux_guid = 0; 1329 nvlist_t *nvl; 1330 1331 if ((label = vdev_label_read_config(vd, VDEV_BEST_LABEL)) == 1332 NULL) { 1333 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1334 VDEV_AUX_BAD_LABEL); 1335 return (0); 1336 } 1337 1338 /* 1339 * Determine if this vdev has been split off into another 1340 * pool. If so, then refuse to open it. 1341 */ 1342 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1343 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1344 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1345 VDEV_AUX_SPLIT_POOL); 1346 nvlist_free(label); 1347 return (0); 1348 } 1349 1350 if (strict && (nvlist_lookup_uint64(label, 1351 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 || 1352 guid != spa_guid(spa))) { 1353 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1354 VDEV_AUX_CORRUPT_DATA); 1355 nvlist_free(label); 1356 return (0); 1357 } 1358 1359 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1360 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1361 &aux_guid) != 0) 1362 aux_guid = 0; 1363 1364 /* 1365 * If this vdev just became a top-level vdev because its 1366 * sibling was detached, it will have adopted the parent's 1367 * vdev guid -- but the label may or may not be on disk yet. 1368 * Fortunately, either version of the label will have the 1369 * same top guid, so if we're a top-level vdev, we can 1370 * safely compare to that instead. 1371 * 1372 * If we split this vdev off instead, then we also check the 1373 * original pool's guid. We don't want to consider the vdev 1374 * corrupt if it is partway through a split operation. 1375 */ 1376 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1377 &guid) != 0 || 1378 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1379 &top_guid) != 0 || 1380 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1381 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1382 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1383 VDEV_AUX_CORRUPT_DATA); 1384 nvlist_free(label); 1385 return (0); 1386 } 1387 1388 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1389 &state) != 0) { 1390 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1391 VDEV_AUX_CORRUPT_DATA); 1392 nvlist_free(label); 1393 return (0); 1394 } 1395 1396 nvlist_free(label); 1397 1398 /* 1399 * If this is a verbatim import, no need to check the 1400 * state of the pool. 1401 */ 1402 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1403 spa_load_state(spa) == SPA_LOAD_OPEN && 1404 state != POOL_STATE_ACTIVE) 1405 return (EBADF); 1406 1407 /* 1408 * If we were able to open and validate a vdev that was 1409 * previously marked permanently unavailable, clear that state 1410 * now. 1411 */ 1412 if (vd->vdev_not_present) 1413 vd->vdev_not_present = 0; 1414 } 1415 1416 return (0); 1417 } 1418 1419 /* 1420 * Close a virtual device. 1421 */ 1422 void 1423 vdev_close(vdev_t *vd) 1424 { 1425 spa_t *spa = vd->vdev_spa; 1426 vdev_t *pvd = vd->vdev_parent; 1427 1428 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1429 1430 /* 1431 * If our parent is reopening, then we are as well, unless we are 1432 * going offline. 1433 */ 1434 if (pvd != NULL && pvd->vdev_reopening) 1435 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1436 1437 vd->vdev_ops->vdev_op_close(vd); 1438 1439 vdev_cache_purge(vd); 1440 1441 /* 1442 * We record the previous state before we close it, so that if we are 1443 * doing a reopen(), we don't generate FMA ereports if we notice that 1444 * it's still faulted. 1445 */ 1446 vd->vdev_prevstate = vd->vdev_state; 1447 1448 if (vd->vdev_offline) 1449 vd->vdev_state = VDEV_STATE_OFFLINE; 1450 else 1451 vd->vdev_state = VDEV_STATE_CLOSED; 1452 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1453 } 1454 1455 void 1456 vdev_hold(vdev_t *vd) 1457 { 1458 spa_t *spa = vd->vdev_spa; 1459 1460 ASSERT(spa_is_root(spa)); 1461 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1462 return; 1463 1464 for (int c = 0; c < vd->vdev_children; c++) 1465 vdev_hold(vd->vdev_child[c]); 1466 1467 if (vd->vdev_ops->vdev_op_leaf) 1468 vd->vdev_ops->vdev_op_hold(vd); 1469 } 1470 1471 void 1472 vdev_rele(vdev_t *vd) 1473 { 1474 spa_t *spa = vd->vdev_spa; 1475 1476 ASSERT(spa_is_root(spa)); 1477 for (int c = 0; c < vd->vdev_children; c++) 1478 vdev_rele(vd->vdev_child[c]); 1479 1480 if (vd->vdev_ops->vdev_op_leaf) 1481 vd->vdev_ops->vdev_op_rele(vd); 1482 } 1483 1484 /* 1485 * Reopen all interior vdevs and any unopened leaves. We don't actually 1486 * reopen leaf vdevs which had previously been opened as they might deadlock 1487 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1488 * If the leaf has never been opened then open it, as usual. 1489 */ 1490 void 1491 vdev_reopen(vdev_t *vd) 1492 { 1493 spa_t *spa = vd->vdev_spa; 1494 1495 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1496 1497 /* set the reopening flag unless we're taking the vdev offline */ 1498 vd->vdev_reopening = !vd->vdev_offline; 1499 vdev_close(vd); 1500 (void) vdev_open(vd); 1501 1502 /* 1503 * Call vdev_validate() here to make sure we have the same device. 1504 * Otherwise, a device with an invalid label could be successfully 1505 * opened in response to vdev_reopen(). 1506 */ 1507 if (vd->vdev_aux) { 1508 (void) vdev_validate_aux(vd); 1509 if (vdev_readable(vd) && vdev_writeable(vd) && 1510 vd->vdev_aux == &spa->spa_l2cache && 1511 !l2arc_vdev_present(vd)) 1512 l2arc_add_vdev(spa, vd); 1513 } else { 1514 (void) vdev_validate(vd, B_TRUE); 1515 } 1516 1517 /* 1518 * Reassess parent vdev's health. 1519 */ 1520 vdev_propagate_state(vd); 1521 } 1522 1523 int 1524 vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1525 { 1526 int error; 1527 1528 /* 1529 * Normally, partial opens (e.g. of a mirror) are allowed. 1530 * For a create, however, we want to fail the request if 1531 * there are any components we can't open. 1532 */ 1533 error = vdev_open(vd); 1534 1535 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1536 vdev_close(vd); 1537 return (error ? error : ENXIO); 1538 } 1539 1540 /* 1541 * Recursively initialize all labels. 1542 */ 1543 if ((error = vdev_label_init(vd, txg, isreplacing ? 1544 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1545 vdev_close(vd); 1546 return (error); 1547 } 1548 1549 return (0); 1550 } 1551 1552 void 1553 vdev_metaslab_set_size(vdev_t *vd) 1554 { 1555 /* 1556 * Aim for roughly 200 metaslabs per vdev. 1557 */ 1558 vd->vdev_ms_shift = highbit(vd->vdev_asize / 200); 1559 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1560 } 1561 1562 void 1563 vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1564 { 1565 ASSERT(vd == vd->vdev_top); 1566 ASSERT(!vd->vdev_ishole); 1567 ASSERT(ISP2(flags)); 1568 ASSERT(spa_writeable(vd->vdev_spa)); 1569 1570 if (flags & VDD_METASLAB) 1571 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1572 1573 if (flags & VDD_DTL) 1574 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1575 1576 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1577 } 1578 1579 /* 1580 * DTLs. 1581 * 1582 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1583 * the vdev has less than perfect replication. There are four kinds of DTL: 1584 * 1585 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1586 * 1587 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1588 * 1589 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1590 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1591 * txgs that was scrubbed. 1592 * 1593 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1594 * persistent errors or just some device being offline. 1595 * Unlike the other three, the DTL_OUTAGE map is not generally 1596 * maintained; it's only computed when needed, typically to 1597 * determine whether a device can be detached. 1598 * 1599 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1600 * either has the data or it doesn't. 1601 * 1602 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1603 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1604 * if any child is less than fully replicated, then so is its parent. 1605 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1606 * comprising only those txgs which appear in 'maxfaults' or more children; 1607 * those are the txgs we don't have enough replication to read. For example, 1608 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1609 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1610 * two child DTL_MISSING maps. 1611 * 1612 * It should be clear from the above that to compute the DTLs and outage maps 1613 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1614 * Therefore, that is all we keep on disk. When loading the pool, or after 1615 * a configuration change, we generate all other DTLs from first principles. 1616 */ 1617 void 1618 vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1619 { 1620 space_map_t *sm = &vd->vdev_dtl[t]; 1621 1622 ASSERT(t < DTL_TYPES); 1623 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1624 ASSERT(spa_writeable(vd->vdev_spa)); 1625 1626 mutex_enter(sm->sm_lock); 1627 if (!space_map_contains(sm, txg, size)) 1628 space_map_add(sm, txg, size); 1629 mutex_exit(sm->sm_lock); 1630 } 1631 1632 boolean_t 1633 vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1634 { 1635 space_map_t *sm = &vd->vdev_dtl[t]; 1636 boolean_t dirty = B_FALSE; 1637 1638 ASSERT(t < DTL_TYPES); 1639 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1640 1641 mutex_enter(sm->sm_lock); 1642 if (sm->sm_space != 0) 1643 dirty = space_map_contains(sm, txg, size); 1644 mutex_exit(sm->sm_lock); 1645 1646 return (dirty); 1647 } 1648 1649 boolean_t 1650 vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1651 { 1652 space_map_t *sm = &vd->vdev_dtl[t]; 1653 boolean_t empty; 1654 1655 mutex_enter(sm->sm_lock); 1656 empty = (sm->sm_space == 0); 1657 mutex_exit(sm->sm_lock); 1658 1659 return (empty); 1660 } 1661 1662 /* 1663 * Reassess DTLs after a config change or scrub completion. 1664 */ 1665 void 1666 vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1667 { 1668 spa_t *spa = vd->vdev_spa; 1669 avl_tree_t reftree; 1670 int minref; 1671 1672 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1673 1674 for (int c = 0; c < vd->vdev_children; c++) 1675 vdev_dtl_reassess(vd->vdev_child[c], txg, 1676 scrub_txg, scrub_done); 1677 1678 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1679 return; 1680 1681 if (vd->vdev_ops->vdev_op_leaf) { 1682 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1683 1684 mutex_enter(&vd->vdev_dtl_lock); 1685 if (scrub_txg != 0 && 1686 (spa->spa_scrub_started || 1687 (scn && scn->scn_phys.scn_errors == 0))) { 1688 /* 1689 * We completed a scrub up to scrub_txg. If we 1690 * did it without rebooting, then the scrub dtl 1691 * will be valid, so excise the old region and 1692 * fold in the scrub dtl. Otherwise, leave the 1693 * dtl as-is if there was an error. 1694 * 1695 * There's little trick here: to excise the beginning 1696 * of the DTL_MISSING map, we put it into a reference 1697 * tree and then add a segment with refcnt -1 that 1698 * covers the range [0, scrub_txg). This means 1699 * that each txg in that range has refcnt -1 or 0. 1700 * We then add DTL_SCRUB with a refcnt of 2, so that 1701 * entries in the range [0, scrub_txg) will have a 1702 * positive refcnt -- either 1 or 2. We then convert 1703 * the reference tree into the new DTL_MISSING map. 1704 */ 1705 space_map_ref_create(&reftree); 1706 space_map_ref_add_map(&reftree, 1707 &vd->vdev_dtl[DTL_MISSING], 1); 1708 space_map_ref_add_seg(&reftree, 0, scrub_txg, -1); 1709 space_map_ref_add_map(&reftree, 1710 &vd->vdev_dtl[DTL_SCRUB], 2); 1711 space_map_ref_generate_map(&reftree, 1712 &vd->vdev_dtl[DTL_MISSING], 1); 1713 space_map_ref_destroy(&reftree); 1714 } 1715 space_map_vacate(&vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1716 space_map_walk(&vd->vdev_dtl[DTL_MISSING], 1717 space_map_add, &vd->vdev_dtl[DTL_PARTIAL]); 1718 if (scrub_done) 1719 space_map_vacate(&vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1720 space_map_vacate(&vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1721 if (!vdev_readable(vd)) 1722 space_map_add(&vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1723 else 1724 space_map_walk(&vd->vdev_dtl[DTL_MISSING], 1725 space_map_add, &vd->vdev_dtl[DTL_OUTAGE]); 1726 mutex_exit(&vd->vdev_dtl_lock); 1727 1728 if (txg != 0) 1729 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 1730 return; 1731 } 1732 1733 mutex_enter(&vd->vdev_dtl_lock); 1734 for (int t = 0; t < DTL_TYPES; t++) { 1735 /* account for child's outage in parent's missing map */ 1736 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 1737 if (t == DTL_SCRUB) 1738 continue; /* leaf vdevs only */ 1739 if (t == DTL_PARTIAL) 1740 minref = 1; /* i.e. non-zero */ 1741 else if (vd->vdev_nparity != 0) 1742 minref = vd->vdev_nparity + 1; /* RAID-Z */ 1743 else 1744 minref = vd->vdev_children; /* any kind of mirror */ 1745 space_map_ref_create(&reftree); 1746 for (int c = 0; c < vd->vdev_children; c++) { 1747 vdev_t *cvd = vd->vdev_child[c]; 1748 mutex_enter(&cvd->vdev_dtl_lock); 1749 space_map_ref_add_map(&reftree, &cvd->vdev_dtl[s], 1); 1750 mutex_exit(&cvd->vdev_dtl_lock); 1751 } 1752 space_map_ref_generate_map(&reftree, &vd->vdev_dtl[t], minref); 1753 space_map_ref_destroy(&reftree); 1754 } 1755 mutex_exit(&vd->vdev_dtl_lock); 1756 } 1757 1758 static int 1759 vdev_dtl_load(vdev_t *vd) 1760 { 1761 spa_t *spa = vd->vdev_spa; 1762 space_map_obj_t *smo = &vd->vdev_dtl_smo; 1763 objset_t *mos = spa->spa_meta_objset; 1764 dmu_buf_t *db; 1765 int error; 1766 1767 ASSERT(vd->vdev_children == 0); 1768 1769 if (smo->smo_object == 0) 1770 return (0); 1771 1772 ASSERT(!vd->vdev_ishole); 1773 1774 if ((error = dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)) != 0) 1775 return (error); 1776 1777 ASSERT3U(db->db_size, >=, sizeof (*smo)); 1778 bcopy(db->db_data, smo, sizeof (*smo)); 1779 dmu_buf_rele(db, FTAG); 1780 1781 mutex_enter(&vd->vdev_dtl_lock); 1782 error = space_map_load(&vd->vdev_dtl[DTL_MISSING], 1783 NULL, SM_ALLOC, smo, mos); 1784 mutex_exit(&vd->vdev_dtl_lock); 1785 1786 return (error); 1787 } 1788 1789 void 1790 vdev_dtl_sync(vdev_t *vd, uint64_t txg) 1791 { 1792 spa_t *spa = vd->vdev_spa; 1793 space_map_obj_t *smo = &vd->vdev_dtl_smo; 1794 space_map_t *sm = &vd->vdev_dtl[DTL_MISSING]; 1795 objset_t *mos = spa->spa_meta_objset; 1796 space_map_t smsync; 1797 kmutex_t smlock; 1798 dmu_buf_t *db; 1799 dmu_tx_t *tx; 1800 1801 ASSERT(!vd->vdev_ishole); 1802 1803 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 1804 1805 if (vd->vdev_detached) { 1806 if (smo->smo_object != 0) { 1807 int err = dmu_object_free(mos, smo->smo_object, tx); 1808 ASSERT0(err); 1809 smo->smo_object = 0; 1810 } 1811 dmu_tx_commit(tx); 1812 return; 1813 } 1814 1815 if (smo->smo_object == 0) { 1816 ASSERT(smo->smo_objsize == 0); 1817 ASSERT(smo->smo_alloc == 0); 1818 smo->smo_object = dmu_object_alloc(mos, 1819 DMU_OT_SPACE_MAP, 1 << SPACE_MAP_BLOCKSHIFT, 1820 DMU_OT_SPACE_MAP_HEADER, sizeof (*smo), tx); 1821 ASSERT(smo->smo_object != 0); 1822 vdev_config_dirty(vd->vdev_top); 1823 } 1824 1825 mutex_init(&smlock, NULL, MUTEX_DEFAULT, NULL); 1826 1827 space_map_create(&smsync, sm->sm_start, sm->sm_size, sm->sm_shift, 1828 &smlock); 1829 1830 mutex_enter(&smlock); 1831 1832 mutex_enter(&vd->vdev_dtl_lock); 1833 space_map_walk(sm, space_map_add, &smsync); 1834 mutex_exit(&vd->vdev_dtl_lock); 1835 1836 space_map_truncate(smo, mos, tx); 1837 space_map_sync(&smsync, SM_ALLOC, smo, mos, tx); 1838 1839 space_map_destroy(&smsync); 1840 1841 mutex_exit(&smlock); 1842 mutex_destroy(&smlock); 1843 1844 VERIFY(0 == dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)); 1845 dmu_buf_will_dirty(db, tx); 1846 ASSERT3U(db->db_size, >=, sizeof (*smo)); 1847 bcopy(smo, db->db_data, sizeof (*smo)); 1848 dmu_buf_rele(db, FTAG); 1849 1850 dmu_tx_commit(tx); 1851 } 1852 1853 /* 1854 * Determine whether the specified vdev can be offlined/detached/removed 1855 * without losing data. 1856 */ 1857 boolean_t 1858 vdev_dtl_required(vdev_t *vd) 1859 { 1860 spa_t *spa = vd->vdev_spa; 1861 vdev_t *tvd = vd->vdev_top; 1862 uint8_t cant_read = vd->vdev_cant_read; 1863 boolean_t required; 1864 1865 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1866 1867 if (vd == spa->spa_root_vdev || vd == tvd) 1868 return (B_TRUE); 1869 1870 /* 1871 * Temporarily mark the device as unreadable, and then determine 1872 * whether this results in any DTL outages in the top-level vdev. 1873 * If not, we can safely offline/detach/remove the device. 1874 */ 1875 vd->vdev_cant_read = B_TRUE; 1876 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 1877 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 1878 vd->vdev_cant_read = cant_read; 1879 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 1880 1881 if (!required && zio_injection_enabled) 1882 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 1883 1884 return (required); 1885 } 1886 1887 /* 1888 * Determine if resilver is needed, and if so the txg range. 1889 */ 1890 boolean_t 1891 vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 1892 { 1893 boolean_t needed = B_FALSE; 1894 uint64_t thismin = UINT64_MAX; 1895 uint64_t thismax = 0; 1896 1897 if (vd->vdev_children == 0) { 1898 mutex_enter(&vd->vdev_dtl_lock); 1899 if (vd->vdev_dtl[DTL_MISSING].sm_space != 0 && 1900 vdev_writeable(vd)) { 1901 space_seg_t *ss; 1902 1903 ss = avl_first(&vd->vdev_dtl[DTL_MISSING].sm_root); 1904 thismin = ss->ss_start - 1; 1905 ss = avl_last(&vd->vdev_dtl[DTL_MISSING].sm_root); 1906 thismax = ss->ss_end; 1907 needed = B_TRUE; 1908 } 1909 mutex_exit(&vd->vdev_dtl_lock); 1910 } else { 1911 for (int c = 0; c < vd->vdev_children; c++) { 1912 vdev_t *cvd = vd->vdev_child[c]; 1913 uint64_t cmin, cmax; 1914 1915 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 1916 thismin = MIN(thismin, cmin); 1917 thismax = MAX(thismax, cmax); 1918 needed = B_TRUE; 1919 } 1920 } 1921 } 1922 1923 if (needed && minp) { 1924 *minp = thismin; 1925 *maxp = thismax; 1926 } 1927 return (needed); 1928 } 1929 1930 void 1931 vdev_load(vdev_t *vd) 1932 { 1933 /* 1934 * Recursively load all children. 1935 */ 1936 for (int c = 0; c < vd->vdev_children; c++) 1937 vdev_load(vd->vdev_child[c]); 1938 1939 /* 1940 * If this is a top-level vdev, initialize its metaslabs. 1941 */ 1942 if (vd == vd->vdev_top && !vd->vdev_ishole && 1943 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 1944 vdev_metaslab_init(vd, 0) != 0)) 1945 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1946 VDEV_AUX_CORRUPT_DATA); 1947 1948 /* 1949 * If this is a leaf vdev, load its DTL. 1950 */ 1951 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 1952 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1953 VDEV_AUX_CORRUPT_DATA); 1954 } 1955 1956 /* 1957 * The special vdev case is used for hot spares and l2cache devices. Its 1958 * sole purpose it to set the vdev state for the associated vdev. To do this, 1959 * we make sure that we can open the underlying device, then try to read the 1960 * label, and make sure that the label is sane and that it hasn't been 1961 * repurposed to another pool. 1962 */ 1963 int 1964 vdev_validate_aux(vdev_t *vd) 1965 { 1966 nvlist_t *label; 1967 uint64_t guid, version; 1968 uint64_t state; 1969 1970 if (!vdev_readable(vd)) 1971 return (0); 1972 1973 if ((label = vdev_label_read_config(vd, VDEV_BEST_LABEL)) == NULL) { 1974 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1975 VDEV_AUX_CORRUPT_DATA); 1976 return (-1); 1977 } 1978 1979 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 1980 !SPA_VERSION_IS_SUPPORTED(version) || 1981 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 1982 guid != vd->vdev_guid || 1983 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 1984 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1985 VDEV_AUX_CORRUPT_DATA); 1986 nvlist_free(label); 1987 return (-1); 1988 } 1989 1990 /* 1991 * We don't actually check the pool state here. If it's in fact in 1992 * use by another pool, we update this fact on the fly when requested. 1993 */ 1994 nvlist_free(label); 1995 return (0); 1996 } 1997 1998 void 1999 vdev_remove(vdev_t *vd, uint64_t txg) 2000 { 2001 spa_t *spa = vd->vdev_spa; 2002 objset_t *mos = spa->spa_meta_objset; 2003 dmu_tx_t *tx; 2004 2005 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2006 2007 if (vd->vdev_dtl_smo.smo_object) { 2008 ASSERT0(vd->vdev_dtl_smo.smo_alloc); 2009 (void) dmu_object_free(mos, vd->vdev_dtl_smo.smo_object, tx); 2010 vd->vdev_dtl_smo.smo_object = 0; 2011 } 2012 2013 if (vd->vdev_ms != NULL) { 2014 for (int m = 0; m < vd->vdev_ms_count; m++) { 2015 metaslab_t *msp = vd->vdev_ms[m]; 2016 2017 if (msp == NULL || msp->ms_smo.smo_object == 0) 2018 continue; 2019 2020 ASSERT0(msp->ms_smo.smo_alloc); 2021 (void) dmu_object_free(mos, msp->ms_smo.smo_object, tx); 2022 msp->ms_smo.smo_object = 0; 2023 } 2024 } 2025 2026 if (vd->vdev_ms_array) { 2027 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2028 vd->vdev_ms_array = 0; 2029 vd->vdev_ms_shift = 0; 2030 } 2031 dmu_tx_commit(tx); 2032 } 2033 2034 void 2035 vdev_sync_done(vdev_t *vd, uint64_t txg) 2036 { 2037 metaslab_t *msp; 2038 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2039 2040 ASSERT(!vd->vdev_ishole); 2041 2042 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2043 metaslab_sync_done(msp, txg); 2044 2045 if (reassess) 2046 metaslab_sync_reassess(vd->vdev_mg); 2047 } 2048 2049 void 2050 vdev_sync(vdev_t *vd, uint64_t txg) 2051 { 2052 spa_t *spa = vd->vdev_spa; 2053 vdev_t *lvd; 2054 metaslab_t *msp; 2055 dmu_tx_t *tx; 2056 2057 ASSERT(!vd->vdev_ishole); 2058 2059 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2060 ASSERT(vd == vd->vdev_top); 2061 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2062 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2063 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2064 ASSERT(vd->vdev_ms_array != 0); 2065 vdev_config_dirty(vd); 2066 dmu_tx_commit(tx); 2067 } 2068 2069 /* 2070 * Remove the metadata associated with this vdev once it's empty. 2071 */ 2072 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2073 vdev_remove(vd, txg); 2074 2075 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2076 metaslab_sync(msp, txg); 2077 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2078 } 2079 2080 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2081 vdev_dtl_sync(lvd, txg); 2082 2083 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2084 } 2085 2086 uint64_t 2087 vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2088 { 2089 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2090 } 2091 2092 /* 2093 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2094 * not be opened, and no I/O is attempted. 2095 */ 2096 int 2097 vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2098 { 2099 vdev_t *vd, *tvd; 2100 2101 spa_vdev_state_enter(spa, SCL_NONE); 2102 2103 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2104 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2105 2106 if (!vd->vdev_ops->vdev_op_leaf) 2107 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2108 2109 tvd = vd->vdev_top; 2110 2111 /* 2112 * We don't directly use the aux state here, but if we do a 2113 * vdev_reopen(), we need this value to be present to remember why we 2114 * were faulted. 2115 */ 2116 vd->vdev_label_aux = aux; 2117 2118 /* 2119 * Faulted state takes precedence over degraded. 2120 */ 2121 vd->vdev_delayed_close = B_FALSE; 2122 vd->vdev_faulted = 1ULL; 2123 vd->vdev_degraded = 0ULL; 2124 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2125 2126 /* 2127 * If this device has the only valid copy of the data, then 2128 * back off and simply mark the vdev as degraded instead. 2129 */ 2130 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2131 vd->vdev_degraded = 1ULL; 2132 vd->vdev_faulted = 0ULL; 2133 2134 /* 2135 * If we reopen the device and it's not dead, only then do we 2136 * mark it degraded. 2137 */ 2138 vdev_reopen(tvd); 2139 2140 if (vdev_readable(vd)) 2141 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2142 } 2143 2144 return (spa_vdev_state_exit(spa, vd, 0)); 2145 } 2146 2147 /* 2148 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2149 * user that something is wrong. The vdev continues to operate as normal as far 2150 * as I/O is concerned. 2151 */ 2152 int 2153 vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2154 { 2155 vdev_t *vd; 2156 2157 spa_vdev_state_enter(spa, SCL_NONE); 2158 2159 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2160 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2161 2162 if (!vd->vdev_ops->vdev_op_leaf) 2163 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2164 2165 /* 2166 * If the vdev is already faulted, then don't do anything. 2167 */ 2168 if (vd->vdev_faulted || vd->vdev_degraded) 2169 return (spa_vdev_state_exit(spa, NULL, 0)); 2170 2171 vd->vdev_degraded = 1ULL; 2172 if (!vdev_is_dead(vd)) 2173 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2174 aux); 2175 2176 return (spa_vdev_state_exit(spa, vd, 0)); 2177 } 2178 2179 /* 2180 * Online the given vdev. If 'unspare' is set, it implies two things. First, 2181 * any attached spare device should be detached when the device finishes 2182 * resilvering. Second, the online should be treated like a 'test' online case, 2183 * so no FMA events are generated if the device fails to open. 2184 */ 2185 int 2186 vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2187 { 2188 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2189 2190 spa_vdev_state_enter(spa, SCL_NONE); 2191 2192 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2193 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2194 2195 if (!vd->vdev_ops->vdev_op_leaf) 2196 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2197 2198 tvd = vd->vdev_top; 2199 vd->vdev_offline = B_FALSE; 2200 vd->vdev_tmpoffline = B_FALSE; 2201 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2202 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2203 2204 /* XXX - L2ARC 1.0 does not support expansion */ 2205 if (!vd->vdev_aux) { 2206 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2207 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2208 } 2209 2210 vdev_reopen(tvd); 2211 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2212 2213 if (!vd->vdev_aux) { 2214 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2215 pvd->vdev_expanding = B_FALSE; 2216 } 2217 2218 if (newstate) 2219 *newstate = vd->vdev_state; 2220 if ((flags & ZFS_ONLINE_UNSPARE) && 2221 !vdev_is_dead(vd) && vd->vdev_parent && 2222 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2223 vd->vdev_parent->vdev_child[0] == vd) 2224 vd->vdev_unspare = B_TRUE; 2225 2226 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2227 2228 /* XXX - L2ARC 1.0 does not support expansion */ 2229 if (vd->vdev_aux) 2230 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2231 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2232 } 2233 return (spa_vdev_state_exit(spa, vd, 0)); 2234 } 2235 2236 static int 2237 vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2238 { 2239 vdev_t *vd, *tvd; 2240 int error = 0; 2241 uint64_t generation; 2242 metaslab_group_t *mg; 2243 2244 top: 2245 spa_vdev_state_enter(spa, SCL_ALLOC); 2246 2247 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2248 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2249 2250 if (!vd->vdev_ops->vdev_op_leaf) 2251 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2252 2253 tvd = vd->vdev_top; 2254 mg = tvd->vdev_mg; 2255 generation = spa->spa_config_generation + 1; 2256 2257 /* 2258 * If the device isn't already offline, try to offline it. 2259 */ 2260 if (!vd->vdev_offline) { 2261 /* 2262 * If this device has the only valid copy of some data, 2263 * don't allow it to be offlined. Log devices are always 2264 * expendable. 2265 */ 2266 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2267 vdev_dtl_required(vd)) 2268 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2269 2270 /* 2271 * If the top-level is a slog and it has had allocations 2272 * then proceed. We check that the vdev's metaslab group 2273 * is not NULL since it's possible that we may have just 2274 * added this vdev but not yet initialized its metaslabs. 2275 */ 2276 if (tvd->vdev_islog && mg != NULL) { 2277 /* 2278 * Prevent any future allocations. 2279 */ 2280 metaslab_group_passivate(mg); 2281 (void) spa_vdev_state_exit(spa, vd, 0); 2282 2283 error = spa_offline_log(spa); 2284 2285 spa_vdev_state_enter(spa, SCL_ALLOC); 2286 2287 /* 2288 * Check to see if the config has changed. 2289 */ 2290 if (error || generation != spa->spa_config_generation) { 2291 metaslab_group_activate(mg); 2292 if (error) 2293 return (spa_vdev_state_exit(spa, 2294 vd, error)); 2295 (void) spa_vdev_state_exit(spa, vd, 0); 2296 goto top; 2297 } 2298 ASSERT0(tvd->vdev_stat.vs_alloc); 2299 } 2300 2301 /* 2302 * Offline this device and reopen its top-level vdev. 2303 * If the top-level vdev is a log device then just offline 2304 * it. Otherwise, if this action results in the top-level 2305 * vdev becoming unusable, undo it and fail the request. 2306 */ 2307 vd->vdev_offline = B_TRUE; 2308 vdev_reopen(tvd); 2309 2310 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2311 vdev_is_dead(tvd)) { 2312 vd->vdev_offline = B_FALSE; 2313 vdev_reopen(tvd); 2314 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2315 } 2316 2317 /* 2318 * Add the device back into the metaslab rotor so that 2319 * once we online the device it's open for business. 2320 */ 2321 if (tvd->vdev_islog && mg != NULL) 2322 metaslab_group_activate(mg); 2323 } 2324 2325 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2326 2327 return (spa_vdev_state_exit(spa, vd, 0)); 2328 } 2329 2330 int 2331 vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2332 { 2333 int error; 2334 2335 mutex_enter(&spa->spa_vdev_top_lock); 2336 error = vdev_offline_locked(spa, guid, flags); 2337 mutex_exit(&spa->spa_vdev_top_lock); 2338 2339 return (error); 2340 } 2341 2342 /* 2343 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2344 * vdev_offline(), we assume the spa config is locked. We also clear all 2345 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2346 */ 2347 void 2348 vdev_clear(spa_t *spa, vdev_t *vd) 2349 { 2350 vdev_t *rvd = spa->spa_root_vdev; 2351 2352 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2353 2354 if (vd == NULL) 2355 vd = rvd; 2356 2357 vd->vdev_stat.vs_read_errors = 0; 2358 vd->vdev_stat.vs_write_errors = 0; 2359 vd->vdev_stat.vs_checksum_errors = 0; 2360 2361 for (int c = 0; c < vd->vdev_children; c++) 2362 vdev_clear(spa, vd->vdev_child[c]); 2363 2364 /* 2365 * If we're in the FAULTED state or have experienced failed I/O, then 2366 * clear the persistent state and attempt to reopen the device. We 2367 * also mark the vdev config dirty, so that the new faulted state is 2368 * written out to disk. 2369 */ 2370 if (vd->vdev_faulted || vd->vdev_degraded || 2371 !vdev_readable(vd) || !vdev_writeable(vd)) { 2372 2373 /* 2374 * When reopening in reponse to a clear event, it may be due to 2375 * a fmadm repair request. In this case, if the device is 2376 * still broken, we want to still post the ereport again. 2377 */ 2378 vd->vdev_forcefault = B_TRUE; 2379 2380 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2381 vd->vdev_cant_read = B_FALSE; 2382 vd->vdev_cant_write = B_FALSE; 2383 2384 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2385 2386 vd->vdev_forcefault = B_FALSE; 2387 2388 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2389 vdev_state_dirty(vd->vdev_top); 2390 2391 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2392 spa_async_request(spa, SPA_ASYNC_RESILVER); 2393 2394 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2395 } 2396 2397 /* 2398 * When clearing a FMA-diagnosed fault, we always want to 2399 * unspare the device, as we assume that the original spare was 2400 * done in response to the FMA fault. 2401 */ 2402 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2403 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2404 vd->vdev_parent->vdev_child[0] == vd) 2405 vd->vdev_unspare = B_TRUE; 2406 } 2407 2408 boolean_t 2409 vdev_is_dead(vdev_t *vd) 2410 { 2411 /* 2412 * Holes and missing devices are always considered "dead". 2413 * This simplifies the code since we don't have to check for 2414 * these types of devices in the various code paths. 2415 * Instead we rely on the fact that we skip over dead devices 2416 * before issuing I/O to them. 2417 */ 2418 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2419 vd->vdev_ops == &vdev_missing_ops); 2420 } 2421 2422 boolean_t 2423 vdev_readable(vdev_t *vd) 2424 { 2425 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2426 } 2427 2428 boolean_t 2429 vdev_writeable(vdev_t *vd) 2430 { 2431 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2432 } 2433 2434 boolean_t 2435 vdev_allocatable(vdev_t *vd) 2436 { 2437 uint64_t state = vd->vdev_state; 2438 2439 /* 2440 * We currently allow allocations from vdevs which may be in the 2441 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2442 * fails to reopen then we'll catch it later when we're holding 2443 * the proper locks. Note that we have to get the vdev state 2444 * in a local variable because although it changes atomically, 2445 * we're asking two separate questions about it. 2446 */ 2447 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2448 !vd->vdev_cant_write && !vd->vdev_ishole); 2449 } 2450 2451 boolean_t 2452 vdev_accessible(vdev_t *vd, zio_t *zio) 2453 { 2454 ASSERT(zio->io_vd == vd); 2455 2456 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2457 return (B_FALSE); 2458 2459 if (zio->io_type == ZIO_TYPE_READ) 2460 return (!vd->vdev_cant_read); 2461 2462 if (zio->io_type == ZIO_TYPE_WRITE) 2463 return (!vd->vdev_cant_write); 2464 2465 return (B_TRUE); 2466 } 2467 2468 /* 2469 * Get statistics for the given vdev. 2470 */ 2471 void 2472 vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2473 { 2474 vdev_t *rvd = vd->vdev_spa->spa_root_vdev; 2475 2476 mutex_enter(&vd->vdev_stat_lock); 2477 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2478 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2479 vs->vs_state = vd->vdev_state; 2480 vs->vs_rsize = vdev_get_min_asize(vd); 2481 if (vd->vdev_ops->vdev_op_leaf) 2482 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2483 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize; 2484 mutex_exit(&vd->vdev_stat_lock); 2485 2486 /* 2487 * If we're getting stats on the root vdev, aggregate the I/O counts 2488 * over all top-level vdevs (i.e. the direct children of the root). 2489 */ 2490 if (vd == rvd) { 2491 for (int c = 0; c < rvd->vdev_children; c++) { 2492 vdev_t *cvd = rvd->vdev_child[c]; 2493 vdev_stat_t *cvs = &cvd->vdev_stat; 2494 2495 mutex_enter(&vd->vdev_stat_lock); 2496 for (int t = 0; t < ZIO_TYPES; t++) { 2497 vs->vs_ops[t] += cvs->vs_ops[t]; 2498 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2499 } 2500 cvs->vs_scan_removing = cvd->vdev_removing; 2501 mutex_exit(&vd->vdev_stat_lock); 2502 } 2503 } 2504 } 2505 2506 void 2507 vdev_clear_stats(vdev_t *vd) 2508 { 2509 mutex_enter(&vd->vdev_stat_lock); 2510 vd->vdev_stat.vs_space = 0; 2511 vd->vdev_stat.vs_dspace = 0; 2512 vd->vdev_stat.vs_alloc = 0; 2513 mutex_exit(&vd->vdev_stat_lock); 2514 } 2515 2516 void 2517 vdev_scan_stat_init(vdev_t *vd) 2518 { 2519 vdev_stat_t *vs = &vd->vdev_stat; 2520 2521 for (int c = 0; c < vd->vdev_children; c++) 2522 vdev_scan_stat_init(vd->vdev_child[c]); 2523 2524 mutex_enter(&vd->vdev_stat_lock); 2525 vs->vs_scan_processed = 0; 2526 mutex_exit(&vd->vdev_stat_lock); 2527 } 2528 2529 void 2530 vdev_stat_update(zio_t *zio, uint64_t psize) 2531 { 2532 spa_t *spa = zio->io_spa; 2533 vdev_t *rvd = spa->spa_root_vdev; 2534 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2535 vdev_t *pvd; 2536 uint64_t txg = zio->io_txg; 2537 vdev_stat_t *vs = &vd->vdev_stat; 2538 zio_type_t type = zio->io_type; 2539 int flags = zio->io_flags; 2540 2541 /* 2542 * If this i/o is a gang leader, it didn't do any actual work. 2543 */ 2544 if (zio->io_gang_tree) 2545 return; 2546 2547 if (zio->io_error == 0) { 2548 /* 2549 * If this is a root i/o, don't count it -- we've already 2550 * counted the top-level vdevs, and vdev_get_stats() will 2551 * aggregate them when asked. This reduces contention on 2552 * the root vdev_stat_lock and implicitly handles blocks 2553 * that compress away to holes, for which there is no i/o. 2554 * (Holes never create vdev children, so all the counters 2555 * remain zero, which is what we want.) 2556 * 2557 * Note: this only applies to successful i/o (io_error == 0) 2558 * because unlike i/o counts, errors are not additive. 2559 * When reading a ditto block, for example, failure of 2560 * one top-level vdev does not imply a root-level error. 2561 */ 2562 if (vd == rvd) 2563 return; 2564 2565 ASSERT(vd == zio->io_vd); 2566 2567 if (flags & ZIO_FLAG_IO_BYPASS) 2568 return; 2569 2570 mutex_enter(&vd->vdev_stat_lock); 2571 2572 if (flags & ZIO_FLAG_IO_REPAIR) { 2573 if (flags & ZIO_FLAG_SCAN_THREAD) { 2574 dsl_scan_phys_t *scn_phys = 2575 &spa->spa_dsl_pool->dp_scan->scn_phys; 2576 uint64_t *processed = &scn_phys->scn_processed; 2577 2578 /* XXX cleanup? */ 2579 if (vd->vdev_ops->vdev_op_leaf) 2580 atomic_add_64(processed, psize); 2581 vs->vs_scan_processed += psize; 2582 } 2583 2584 if (flags & ZIO_FLAG_SELF_HEAL) 2585 vs->vs_self_healed += psize; 2586 } 2587 2588 vs->vs_ops[type]++; 2589 vs->vs_bytes[type] += psize; 2590 2591 mutex_exit(&vd->vdev_stat_lock); 2592 return; 2593 } 2594 2595 if (flags & ZIO_FLAG_SPECULATIVE) 2596 return; 2597 2598 /* 2599 * If this is an I/O error that is going to be retried, then ignore the 2600 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2601 * hard errors, when in reality they can happen for any number of 2602 * innocuous reasons (bus resets, MPxIO link failure, etc). 2603 */ 2604 if (zio->io_error == EIO && 2605 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2606 return; 2607 2608 /* 2609 * Intent logs writes won't propagate their error to the root 2610 * I/O so don't mark these types of failures as pool-level 2611 * errors. 2612 */ 2613 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2614 return; 2615 2616 mutex_enter(&vd->vdev_stat_lock); 2617 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2618 if (zio->io_error == ECKSUM) 2619 vs->vs_checksum_errors++; 2620 else 2621 vs->vs_read_errors++; 2622 } 2623 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2624 vs->vs_write_errors++; 2625 mutex_exit(&vd->vdev_stat_lock); 2626 2627 if (type == ZIO_TYPE_WRITE && txg != 0 && 2628 (!(flags & ZIO_FLAG_IO_REPAIR) || 2629 (flags & ZIO_FLAG_SCAN_THREAD) || 2630 spa->spa_claiming)) { 2631 /* 2632 * This is either a normal write (not a repair), or it's 2633 * a repair induced by the scrub thread, or it's a repair 2634 * made by zil_claim() during spa_load() in the first txg. 2635 * In the normal case, we commit the DTL change in the same 2636 * txg as the block was born. In the scrub-induced repair 2637 * case, we know that scrubs run in first-pass syncing context, 2638 * so we commit the DTL change in spa_syncing_txg(spa). 2639 * In the zil_claim() case, we commit in spa_first_txg(spa). 2640 * 2641 * We currently do not make DTL entries for failed spontaneous 2642 * self-healing writes triggered by normal (non-scrubbing) 2643 * reads, because we have no transactional context in which to 2644 * do so -- and it's not clear that it'd be desirable anyway. 2645 */ 2646 if (vd->vdev_ops->vdev_op_leaf) { 2647 uint64_t commit_txg = txg; 2648 if (flags & ZIO_FLAG_SCAN_THREAD) { 2649 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2650 ASSERT(spa_sync_pass(spa) == 1); 2651 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 2652 commit_txg = spa_syncing_txg(spa); 2653 } else if (spa->spa_claiming) { 2654 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2655 commit_txg = spa_first_txg(spa); 2656 } 2657 ASSERT(commit_txg >= spa_syncing_txg(spa)); 2658 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 2659 return; 2660 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2661 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 2662 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 2663 } 2664 if (vd != rvd) 2665 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 2666 } 2667 } 2668 2669 /* 2670 * Update the in-core space usage stats for this vdev, its metaslab class, 2671 * and the root vdev. 2672 */ 2673 void 2674 vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 2675 int64_t space_delta) 2676 { 2677 int64_t dspace_delta = space_delta; 2678 spa_t *spa = vd->vdev_spa; 2679 vdev_t *rvd = spa->spa_root_vdev; 2680 metaslab_group_t *mg = vd->vdev_mg; 2681 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 2682 2683 ASSERT(vd == vd->vdev_top); 2684 2685 /* 2686 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 2687 * factor. We must calculate this here and not at the root vdev 2688 * because the root vdev's psize-to-asize is simply the max of its 2689 * childrens', thus not accurate enough for us. 2690 */ 2691 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 2692 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 2693 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 2694 vd->vdev_deflate_ratio; 2695 2696 mutex_enter(&vd->vdev_stat_lock); 2697 vd->vdev_stat.vs_alloc += alloc_delta; 2698 vd->vdev_stat.vs_space += space_delta; 2699 vd->vdev_stat.vs_dspace += dspace_delta; 2700 mutex_exit(&vd->vdev_stat_lock); 2701 2702 if (mc == spa_normal_class(spa)) { 2703 mutex_enter(&rvd->vdev_stat_lock); 2704 rvd->vdev_stat.vs_alloc += alloc_delta; 2705 rvd->vdev_stat.vs_space += space_delta; 2706 rvd->vdev_stat.vs_dspace += dspace_delta; 2707 mutex_exit(&rvd->vdev_stat_lock); 2708 } 2709 2710 if (mc != NULL) { 2711 ASSERT(rvd == vd->vdev_parent); 2712 ASSERT(vd->vdev_ms_count != 0); 2713 2714 metaslab_class_space_update(mc, 2715 alloc_delta, defer_delta, space_delta, dspace_delta); 2716 } 2717 } 2718 2719 /* 2720 * Mark a top-level vdev's config as dirty, placing it on the dirty list 2721 * so that it will be written out next time the vdev configuration is synced. 2722 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 2723 */ 2724 void 2725 vdev_config_dirty(vdev_t *vd) 2726 { 2727 spa_t *spa = vd->vdev_spa; 2728 vdev_t *rvd = spa->spa_root_vdev; 2729 int c; 2730 2731 ASSERT(spa_writeable(spa)); 2732 2733 /* 2734 * If this is an aux vdev (as with l2cache and spare devices), then we 2735 * update the vdev config manually and set the sync flag. 2736 */ 2737 if (vd->vdev_aux != NULL) { 2738 spa_aux_vdev_t *sav = vd->vdev_aux; 2739 nvlist_t **aux; 2740 uint_t naux; 2741 2742 for (c = 0; c < sav->sav_count; c++) { 2743 if (sav->sav_vdevs[c] == vd) 2744 break; 2745 } 2746 2747 if (c == sav->sav_count) { 2748 /* 2749 * We're being removed. There's nothing more to do. 2750 */ 2751 ASSERT(sav->sav_sync == B_TRUE); 2752 return; 2753 } 2754 2755 sav->sav_sync = B_TRUE; 2756 2757 if (nvlist_lookup_nvlist_array(sav->sav_config, 2758 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 2759 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 2760 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 2761 } 2762 2763 ASSERT(c < naux); 2764 2765 /* 2766 * Setting the nvlist in the middle if the array is a little 2767 * sketchy, but it will work. 2768 */ 2769 nvlist_free(aux[c]); 2770 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 2771 2772 return; 2773 } 2774 2775 /* 2776 * The dirty list is protected by the SCL_CONFIG lock. The caller 2777 * must either hold SCL_CONFIG as writer, or must be the sync thread 2778 * (which holds SCL_CONFIG as reader). There's only one sync thread, 2779 * so this is sufficient to ensure mutual exclusion. 2780 */ 2781 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 2782 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2783 spa_config_held(spa, SCL_CONFIG, RW_READER))); 2784 2785 if (vd == rvd) { 2786 for (c = 0; c < rvd->vdev_children; c++) 2787 vdev_config_dirty(rvd->vdev_child[c]); 2788 } else { 2789 ASSERT(vd == vd->vdev_top); 2790 2791 if (!list_link_active(&vd->vdev_config_dirty_node) && 2792 !vd->vdev_ishole) 2793 list_insert_head(&spa->spa_config_dirty_list, vd); 2794 } 2795 } 2796 2797 void 2798 vdev_config_clean(vdev_t *vd) 2799 { 2800 spa_t *spa = vd->vdev_spa; 2801 2802 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 2803 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2804 spa_config_held(spa, SCL_CONFIG, RW_READER))); 2805 2806 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 2807 list_remove(&spa->spa_config_dirty_list, vd); 2808 } 2809 2810 /* 2811 * Mark a top-level vdev's state as dirty, so that the next pass of 2812 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 2813 * the state changes from larger config changes because they require 2814 * much less locking, and are often needed for administrative actions. 2815 */ 2816 void 2817 vdev_state_dirty(vdev_t *vd) 2818 { 2819 spa_t *spa = vd->vdev_spa; 2820 2821 ASSERT(spa_writeable(spa)); 2822 ASSERT(vd == vd->vdev_top); 2823 2824 /* 2825 * The state list is protected by the SCL_STATE lock. The caller 2826 * must either hold SCL_STATE as writer, or must be the sync thread 2827 * (which holds SCL_STATE as reader). There's only one sync thread, 2828 * so this is sufficient to ensure mutual exclusion. 2829 */ 2830 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 2831 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2832 spa_config_held(spa, SCL_STATE, RW_READER))); 2833 2834 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 2835 list_insert_head(&spa->spa_state_dirty_list, vd); 2836 } 2837 2838 void 2839 vdev_state_clean(vdev_t *vd) 2840 { 2841 spa_t *spa = vd->vdev_spa; 2842 2843 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 2844 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2845 spa_config_held(spa, SCL_STATE, RW_READER))); 2846 2847 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 2848 list_remove(&spa->spa_state_dirty_list, vd); 2849 } 2850 2851 /* 2852 * Propagate vdev state up from children to parent. 2853 */ 2854 void 2855 vdev_propagate_state(vdev_t *vd) 2856 { 2857 spa_t *spa = vd->vdev_spa; 2858 vdev_t *rvd = spa->spa_root_vdev; 2859 int degraded = 0, faulted = 0; 2860 int corrupted = 0; 2861 vdev_t *child; 2862 2863 if (vd->vdev_children > 0) { 2864 for (int c = 0; c < vd->vdev_children; c++) { 2865 child = vd->vdev_child[c]; 2866 2867 /* 2868 * Don't factor holes into the decision. 2869 */ 2870 if (child->vdev_ishole) 2871 continue; 2872 2873 if (!vdev_readable(child) || 2874 (!vdev_writeable(child) && spa_writeable(spa))) { 2875 /* 2876 * Root special: if there is a top-level log 2877 * device, treat the root vdev as if it were 2878 * degraded. 2879 */ 2880 if (child->vdev_islog && vd == rvd) 2881 degraded++; 2882 else 2883 faulted++; 2884 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 2885 degraded++; 2886 } 2887 2888 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 2889 corrupted++; 2890 } 2891 2892 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 2893 2894 /* 2895 * Root special: if there is a top-level vdev that cannot be 2896 * opened due to corrupted metadata, then propagate the root 2897 * vdev's aux state as 'corrupt' rather than 'insufficient 2898 * replicas'. 2899 */ 2900 if (corrupted && vd == rvd && 2901 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 2902 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 2903 VDEV_AUX_CORRUPT_DATA); 2904 } 2905 2906 if (vd->vdev_parent) 2907 vdev_propagate_state(vd->vdev_parent); 2908 } 2909 2910 /* 2911 * Set a vdev's state. If this is during an open, we don't update the parent 2912 * state, because we're in the process of opening children depth-first. 2913 * Otherwise, we propagate the change to the parent. 2914 * 2915 * If this routine places a device in a faulted state, an appropriate ereport is 2916 * generated. 2917 */ 2918 void 2919 vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 2920 { 2921 uint64_t save_state; 2922 spa_t *spa = vd->vdev_spa; 2923 2924 if (state == vd->vdev_state) { 2925 vd->vdev_stat.vs_aux = aux; 2926 return; 2927 } 2928 2929 save_state = vd->vdev_state; 2930 2931 vd->vdev_state = state; 2932 vd->vdev_stat.vs_aux = aux; 2933 2934 /* 2935 * If we are setting the vdev state to anything but an open state, then 2936 * always close the underlying device unless the device has requested 2937 * a delayed close (i.e. we're about to remove or fault the device). 2938 * Otherwise, we keep accessible but invalid devices open forever. 2939 * We don't call vdev_close() itself, because that implies some extra 2940 * checks (offline, etc) that we don't want here. This is limited to 2941 * leaf devices, because otherwise closing the device will affect other 2942 * children. 2943 */ 2944 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 2945 vd->vdev_ops->vdev_op_leaf) 2946 vd->vdev_ops->vdev_op_close(vd); 2947 2948 /* 2949 * If we have brought this vdev back into service, we need 2950 * to notify fmd so that it can gracefully repair any outstanding 2951 * cases due to a missing device. We do this in all cases, even those 2952 * that probably don't correlate to a repaired fault. This is sure to 2953 * catch all cases, and we let the zfs-retire agent sort it out. If 2954 * this is a transient state it's OK, as the retire agent will 2955 * double-check the state of the vdev before repairing it. 2956 */ 2957 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 2958 vd->vdev_prevstate != state) 2959 zfs_post_state_change(spa, vd); 2960 2961 if (vd->vdev_removed && 2962 state == VDEV_STATE_CANT_OPEN && 2963 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 2964 /* 2965 * If the previous state is set to VDEV_STATE_REMOVED, then this 2966 * device was previously marked removed and someone attempted to 2967 * reopen it. If this failed due to a nonexistent device, then 2968 * keep the device in the REMOVED state. We also let this be if 2969 * it is one of our special test online cases, which is only 2970 * attempting to online the device and shouldn't generate an FMA 2971 * fault. 2972 */ 2973 vd->vdev_state = VDEV_STATE_REMOVED; 2974 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 2975 } else if (state == VDEV_STATE_REMOVED) { 2976 vd->vdev_removed = B_TRUE; 2977 } else if (state == VDEV_STATE_CANT_OPEN) { 2978 /* 2979 * If we fail to open a vdev during an import or recovery, we 2980 * mark it as "not available", which signifies that it was 2981 * never there to begin with. Failure to open such a device 2982 * is not considered an error. 2983 */ 2984 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 2985 spa_load_state(spa) == SPA_LOAD_RECOVER) && 2986 vd->vdev_ops->vdev_op_leaf) 2987 vd->vdev_not_present = 1; 2988 2989 /* 2990 * Post the appropriate ereport. If the 'prevstate' field is 2991 * set to something other than VDEV_STATE_UNKNOWN, it indicates 2992 * that this is part of a vdev_reopen(). In this case, we don't 2993 * want to post the ereport if the device was already in the 2994 * CANT_OPEN state beforehand. 2995 * 2996 * If the 'checkremove' flag is set, then this is an attempt to 2997 * online the device in response to an insertion event. If we 2998 * hit this case, then we have detected an insertion event for a 2999 * faulted or offline device that wasn't in the removed state. 3000 * In this scenario, we don't post an ereport because we are 3001 * about to replace the device, or attempt an online with 3002 * vdev_forcefault, which will generate the fault for us. 3003 */ 3004 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 3005 !vd->vdev_not_present && !vd->vdev_checkremove && 3006 vd != spa->spa_root_vdev) { 3007 const char *class; 3008 3009 switch (aux) { 3010 case VDEV_AUX_OPEN_FAILED: 3011 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 3012 break; 3013 case VDEV_AUX_CORRUPT_DATA: 3014 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3015 break; 3016 case VDEV_AUX_NO_REPLICAS: 3017 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3018 break; 3019 case VDEV_AUX_BAD_GUID_SUM: 3020 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3021 break; 3022 case VDEV_AUX_TOO_SMALL: 3023 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3024 break; 3025 case VDEV_AUX_BAD_LABEL: 3026 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3027 break; 3028 default: 3029 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3030 } 3031 3032 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3033 } 3034 3035 /* Erase any notion of persistent removed state */ 3036 vd->vdev_removed = B_FALSE; 3037 } else { 3038 vd->vdev_removed = B_FALSE; 3039 } 3040 3041 if (!isopen && vd->vdev_parent) 3042 vdev_propagate_state(vd->vdev_parent); 3043 } 3044 3045 /* 3046 * Check the vdev configuration to ensure that it's capable of supporting 3047 * a root pool. Currently, we do not support RAID-Z or partial configuration. 3048 * In addition, only a single top-level vdev is allowed and none of the leaves 3049 * can be wholedisks. 3050 */ 3051 boolean_t 3052 vdev_is_bootable(vdev_t *vd) 3053 { 3054 if (!vd->vdev_ops->vdev_op_leaf) { 3055 char *vdev_type = vd->vdev_ops->vdev_op_type; 3056 3057 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3058 vd->vdev_children > 1) { 3059 return (B_FALSE); 3060 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3061 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3062 return (B_FALSE); 3063 } 3064 } else if (vd->vdev_wholedisk == 1) { 3065 return (B_FALSE); 3066 } 3067 3068 for (int c = 0; c < vd->vdev_children; c++) { 3069 if (!vdev_is_bootable(vd->vdev_child[c])) 3070 return (B_FALSE); 3071 } 3072 return (B_TRUE); 3073 } 3074 3075 /* 3076 * Load the state from the original vdev tree (ovd) which 3077 * we've retrieved from the MOS config object. If the original 3078 * vdev was offline or faulted then we transfer that state to the 3079 * device in the current vdev tree (nvd). 3080 */ 3081 void 3082 vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3083 { 3084 spa_t *spa = nvd->vdev_spa; 3085 3086 ASSERT(nvd->vdev_top->vdev_islog); 3087 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3088 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3089 3090 for (int c = 0; c < nvd->vdev_children; c++) 3091 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3092 3093 if (nvd->vdev_ops->vdev_op_leaf) { 3094 /* 3095 * Restore the persistent vdev state 3096 */ 3097 nvd->vdev_offline = ovd->vdev_offline; 3098 nvd->vdev_faulted = ovd->vdev_faulted; 3099 nvd->vdev_degraded = ovd->vdev_degraded; 3100 nvd->vdev_removed = ovd->vdev_removed; 3101 } 3102 } 3103 3104 /* 3105 * Determine if a log device has valid content. If the vdev was 3106 * removed or faulted in the MOS config then we know that 3107 * the content on the log device has already been written to the pool. 3108 */ 3109 boolean_t 3110 vdev_log_state_valid(vdev_t *vd) 3111 { 3112 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3113 !vd->vdev_removed) 3114 return (B_TRUE); 3115 3116 for (int c = 0; c < vd->vdev_children; c++) 3117 if (vdev_log_state_valid(vd->vdev_child[c])) 3118 return (B_TRUE); 3119 3120 return (B_FALSE); 3121 } 3122 3123 /* 3124 * Expand a vdev if possible. 3125 */ 3126 void 3127 vdev_expand(vdev_t *vd, uint64_t txg) 3128 { 3129 ASSERT(vd->vdev_top == vd); 3130 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3131 3132 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3133 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3134 vdev_config_dirty(vd); 3135 } 3136 } 3137 3138 /* 3139 * Split a vdev. 3140 */ 3141 void 3142 vdev_split(vdev_t *vd) 3143 { 3144 vdev_t *cvd, *pvd = vd->vdev_parent; 3145 3146 vdev_remove_child(pvd, vd); 3147 vdev_compact_children(pvd); 3148 3149 cvd = pvd->vdev_child[0]; 3150 if (pvd->vdev_children == 1) { 3151 vdev_remove_parent(cvd); 3152 cvd->vdev_splitting = B_TRUE; 3153 } 3154 vdev_propagate_state(cvd); 3155 }