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 (c) 2011, 2018 by Delphix. All rights reserved. 25 * Copyright 2017 Nexenta Systems, Inc. 26 * Copyright (c) 2014 Integros [integros.com] 27 * Copyright 2016 Toomas Soome <tsoome@me.com> 28 * Copyright 2017 Joyent, Inc. 29 * Copyright (c) 2017, Intel Corporation. 30 */ 31 32 #include <sys/zfs_context.h> 33 #include <sys/fm/fs/zfs.h> 34 #include <sys/spa.h> 35 #include <sys/spa_impl.h> 36 #include <sys/bpobj.h> 37 #include <sys/dmu.h> 38 #include <sys/dmu_tx.h> 39 #include <sys/dsl_dir.h> 40 #include <sys/vdev_impl.h> 41 #include <sys/uberblock_impl.h> 42 #include <sys/metaslab.h> 43 #include <sys/metaslab_impl.h> 44 #include <sys/space_map.h> 45 #include <sys/space_reftree.h> 46 #include <sys/zio.h> 47 #include <sys/zap.h> 48 #include <sys/fs/zfs.h> 49 #include <sys/arc.h> 50 #include <sys/zil.h> 51 #include <sys/dsl_scan.h> 52 #include <sys/abd.h> 53 #include <sys/vdev_initialize.h> 54 55 /* 56 * Virtual device management. 57 */ 58 59 static vdev_ops_t *vdev_ops_table[] = { 60 &vdev_root_ops, 61 &vdev_raidz_ops, 62 &vdev_mirror_ops, 63 &vdev_replacing_ops, 64 &vdev_spare_ops, 65 &vdev_disk_ops, 66 &vdev_file_ops, 67 &vdev_missing_ops, 68 &vdev_hole_ops, 69 &vdev_indirect_ops, 70 NULL 71 }; 72 73 /* maximum scrub/resilver I/O queue per leaf vdev */ 74 int zfs_scrub_limit = 10; 75 76 /* default target for number of metaslabs per top-level vdev */ 77 int zfs_vdev_default_ms_count = 200; 78 79 /* minimum number of metaslabs per top-level vdev */ 80 int zfs_vdev_min_ms_count = 16; 81 82 /* practical upper limit of total metaslabs per top-level vdev */ 83 int zfs_vdev_ms_count_limit = 1ULL << 17; 84 85 /* lower limit for metaslab size (512M) */ 86 int zfs_vdev_default_ms_shift = 29; 87 88 /* upper limit for metaslab size (16G) */ 89 int zfs_vdev_max_ms_shift = 34; 90 91 boolean_t vdev_validate_skip = B_FALSE; 92 93 /* 94 * Since the DTL space map of a vdev is not expected to have a lot of 95 * entries, we default its block size to 4K. 96 */ 97 int vdev_dtl_sm_blksz = (1 << 12); 98 99 /* 100 * vdev-wide space maps that have lots of entries written to them at 101 * the end of each transaction can benefit from a higher I/O bandwidth 102 * (e.g. vdev_obsolete_sm), thus we default their block size to 128K. 103 */ 104 int vdev_standard_sm_blksz = (1 << 17); 105 106 int zfs_ashift_min; 107 108 /*PRINTFLIKE2*/ 109 void 110 vdev_dbgmsg(vdev_t *vd, const char *fmt, ...) 111 { 112 va_list adx; 113 char buf[256]; 114 115 va_start(adx, fmt); 116 (void) vsnprintf(buf, sizeof (buf), fmt, adx); 117 va_end(adx); 118 119 if (vd->vdev_path != NULL) { 120 zfs_dbgmsg("%s vdev '%s': %s", vd->vdev_ops->vdev_op_type, 121 vd->vdev_path, buf); 122 } else { 123 zfs_dbgmsg("%s-%llu vdev (guid %llu): %s", 124 vd->vdev_ops->vdev_op_type, 125 (u_longlong_t)vd->vdev_id, 126 (u_longlong_t)vd->vdev_guid, buf); 127 } 128 } 129 130 void 131 vdev_dbgmsg_print_tree(vdev_t *vd, int indent) 132 { 133 char state[20]; 134 135 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) { 136 zfs_dbgmsg("%*svdev %u: %s", indent, "", vd->vdev_id, 137 vd->vdev_ops->vdev_op_type); 138 return; 139 } 140 141 switch (vd->vdev_state) { 142 case VDEV_STATE_UNKNOWN: 143 (void) snprintf(state, sizeof (state), "unknown"); 144 break; 145 case VDEV_STATE_CLOSED: 146 (void) snprintf(state, sizeof (state), "closed"); 147 break; 148 case VDEV_STATE_OFFLINE: 149 (void) snprintf(state, sizeof (state), "offline"); 150 break; 151 case VDEV_STATE_REMOVED: 152 (void) snprintf(state, sizeof (state), "removed"); 153 break; 154 case VDEV_STATE_CANT_OPEN: 155 (void) snprintf(state, sizeof (state), "can't open"); 156 break; 157 case VDEV_STATE_FAULTED: 158 (void) snprintf(state, sizeof (state), "faulted"); 159 break; 160 case VDEV_STATE_DEGRADED: 161 (void) snprintf(state, sizeof (state), "degraded"); 162 break; 163 case VDEV_STATE_HEALTHY: 164 (void) snprintf(state, sizeof (state), "healthy"); 165 break; 166 default: 167 (void) snprintf(state, sizeof (state), "<state %u>", 168 (uint_t)vd->vdev_state); 169 } 170 171 zfs_dbgmsg("%*svdev %u: %s%s, guid: %llu, path: %s, %s", indent, 172 "", (int)vd->vdev_id, vd->vdev_ops->vdev_op_type, 173 vd->vdev_islog ? " (log)" : "", 174 (u_longlong_t)vd->vdev_guid, 175 vd->vdev_path ? vd->vdev_path : "N/A", state); 176 177 for (uint64_t i = 0; i < vd->vdev_children; i++) 178 vdev_dbgmsg_print_tree(vd->vdev_child[i], indent + 2); 179 } 180 181 /* 182 * Given a vdev type, return the appropriate ops vector. 183 */ 184 static vdev_ops_t * 185 vdev_getops(const char *type) 186 { 187 vdev_ops_t *ops, **opspp; 188 189 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 190 if (strcmp(ops->vdev_op_type, type) == 0) 191 break; 192 193 return (ops); 194 } 195 196 /* 197 * Derive the enumerated alloction bias from string input. 198 * String origin is either the per-vdev zap or zpool(1M). 199 */ 200 static vdev_alloc_bias_t 201 vdev_derive_alloc_bias(const char *bias) 202 { 203 vdev_alloc_bias_t alloc_bias = VDEV_BIAS_NONE; 204 205 if (strcmp(bias, VDEV_ALLOC_BIAS_LOG) == 0) 206 alloc_bias = VDEV_BIAS_LOG; 207 else if (strcmp(bias, VDEV_ALLOC_BIAS_SPECIAL) == 0) 208 alloc_bias = VDEV_BIAS_SPECIAL; 209 else if (strcmp(bias, VDEV_ALLOC_BIAS_DEDUP) == 0) 210 alloc_bias = VDEV_BIAS_DEDUP; 211 212 return (alloc_bias); 213 } 214 215 /* ARGSUSED */ 216 void 217 vdev_default_xlate(vdev_t *vd, const range_seg_t *in, range_seg_t *res) 218 { 219 res->rs_start = in->rs_start; 220 res->rs_end = in->rs_end; 221 } 222 223 /* 224 * Default asize function: return the MAX of psize with the asize of 225 * all children. This is what's used by anything other than RAID-Z. 226 */ 227 uint64_t 228 vdev_default_asize(vdev_t *vd, uint64_t psize) 229 { 230 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 231 uint64_t csize; 232 233 for (int c = 0; c < vd->vdev_children; c++) { 234 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 235 asize = MAX(asize, csize); 236 } 237 238 return (asize); 239 } 240 241 /* 242 * Get the minimum allocatable size. We define the allocatable size as 243 * the vdev's asize rounded to the nearest metaslab. This allows us to 244 * replace or attach devices which don't have the same physical size but 245 * can still satisfy the same number of allocations. 246 */ 247 uint64_t 248 vdev_get_min_asize(vdev_t *vd) 249 { 250 vdev_t *pvd = vd->vdev_parent; 251 252 /* 253 * If our parent is NULL (inactive spare or cache) or is the root, 254 * just return our own asize. 255 */ 256 if (pvd == NULL) 257 return (vd->vdev_asize); 258 259 /* 260 * The top-level vdev just returns the allocatable size rounded 261 * to the nearest metaslab. 262 */ 263 if (vd == vd->vdev_top) 264 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 265 266 /* 267 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 268 * so each child must provide at least 1/Nth of its asize. 269 */ 270 if (pvd->vdev_ops == &vdev_raidz_ops) 271 return ((pvd->vdev_min_asize + pvd->vdev_children - 1) / 272 pvd->vdev_children); 273 274 return (pvd->vdev_min_asize); 275 } 276 277 void 278 vdev_set_min_asize(vdev_t *vd) 279 { 280 vd->vdev_min_asize = vdev_get_min_asize(vd); 281 282 for (int c = 0; c < vd->vdev_children; c++) 283 vdev_set_min_asize(vd->vdev_child[c]); 284 } 285 286 vdev_t * 287 vdev_lookup_top(spa_t *spa, uint64_t vdev) 288 { 289 vdev_t *rvd = spa->spa_root_vdev; 290 291 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 292 293 if (vdev < rvd->vdev_children) { 294 ASSERT(rvd->vdev_child[vdev] != NULL); 295 return (rvd->vdev_child[vdev]); 296 } 297 298 return (NULL); 299 } 300 301 vdev_t * 302 vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 303 { 304 vdev_t *mvd; 305 306 if (vd->vdev_guid == guid) 307 return (vd); 308 309 for (int c = 0; c < vd->vdev_children; c++) 310 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 311 NULL) 312 return (mvd); 313 314 return (NULL); 315 } 316 317 static int 318 vdev_count_leaves_impl(vdev_t *vd) 319 { 320 int n = 0; 321 322 if (vd->vdev_ops->vdev_op_leaf) 323 return (1); 324 325 for (int c = 0; c < vd->vdev_children; c++) 326 n += vdev_count_leaves_impl(vd->vdev_child[c]); 327 328 return (n); 329 } 330 331 int 332 vdev_count_leaves(spa_t *spa) 333 { 334 return (vdev_count_leaves_impl(spa->spa_root_vdev)); 335 } 336 337 void 338 vdev_add_child(vdev_t *pvd, vdev_t *cvd) 339 { 340 size_t oldsize, newsize; 341 uint64_t id = cvd->vdev_id; 342 vdev_t **newchild; 343 spa_t *spa = cvd->vdev_spa; 344 345 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 346 ASSERT(cvd->vdev_parent == NULL); 347 348 cvd->vdev_parent = pvd; 349 350 if (pvd == NULL) 351 return; 352 353 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 354 355 oldsize = pvd->vdev_children * sizeof (vdev_t *); 356 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 357 newsize = pvd->vdev_children * sizeof (vdev_t *); 358 359 newchild = kmem_zalloc(newsize, KM_SLEEP); 360 if (pvd->vdev_child != NULL) { 361 bcopy(pvd->vdev_child, newchild, oldsize); 362 kmem_free(pvd->vdev_child, oldsize); 363 } 364 365 pvd->vdev_child = newchild; 366 pvd->vdev_child[id] = cvd; 367 368 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 369 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 370 371 /* 372 * Walk up all ancestors to update guid sum. 373 */ 374 for (; pvd != NULL; pvd = pvd->vdev_parent) 375 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 376 377 if (cvd->vdev_ops->vdev_op_leaf) { 378 list_insert_head(&cvd->vdev_spa->spa_leaf_list, cvd); 379 cvd->vdev_spa->spa_leaf_list_gen++; 380 } 381 } 382 383 void 384 vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 385 { 386 int c; 387 uint_t id = cvd->vdev_id; 388 389 ASSERT(cvd->vdev_parent == pvd); 390 391 if (pvd == NULL) 392 return; 393 394 ASSERT(id < pvd->vdev_children); 395 ASSERT(pvd->vdev_child[id] == cvd); 396 397 pvd->vdev_child[id] = NULL; 398 cvd->vdev_parent = NULL; 399 400 for (c = 0; c < pvd->vdev_children; c++) 401 if (pvd->vdev_child[c]) 402 break; 403 404 if (c == pvd->vdev_children) { 405 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 406 pvd->vdev_child = NULL; 407 pvd->vdev_children = 0; 408 } 409 410 if (cvd->vdev_ops->vdev_op_leaf) { 411 spa_t *spa = cvd->vdev_spa; 412 list_remove(&spa->spa_leaf_list, cvd); 413 spa->spa_leaf_list_gen++; 414 } 415 416 /* 417 * Walk up all ancestors to update guid sum. 418 */ 419 for (; pvd != NULL; pvd = pvd->vdev_parent) 420 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 421 } 422 423 /* 424 * Remove any holes in the child array. 425 */ 426 void 427 vdev_compact_children(vdev_t *pvd) 428 { 429 vdev_t **newchild, *cvd; 430 int oldc = pvd->vdev_children; 431 int newc; 432 433 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 434 435 for (int c = newc = 0; c < oldc; c++) 436 if (pvd->vdev_child[c]) 437 newc++; 438 439 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 440 441 for (int c = newc = 0; c < oldc; c++) { 442 if ((cvd = pvd->vdev_child[c]) != NULL) { 443 newchild[newc] = cvd; 444 cvd->vdev_id = newc++; 445 } 446 } 447 448 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 449 pvd->vdev_child = newchild; 450 pvd->vdev_children = newc; 451 } 452 453 /* 454 * Allocate and minimally initialize a vdev_t. 455 */ 456 vdev_t * 457 vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 458 { 459 vdev_t *vd; 460 vdev_indirect_config_t *vic; 461 462 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 463 vic = &vd->vdev_indirect_config; 464 465 if (spa->spa_root_vdev == NULL) { 466 ASSERT(ops == &vdev_root_ops); 467 spa->spa_root_vdev = vd; 468 spa->spa_load_guid = spa_generate_guid(NULL); 469 } 470 471 if (guid == 0 && ops != &vdev_hole_ops) { 472 if (spa->spa_root_vdev == vd) { 473 /* 474 * The root vdev's guid will also be the pool guid, 475 * which must be unique among all pools. 476 */ 477 guid = spa_generate_guid(NULL); 478 } else { 479 /* 480 * Any other vdev's guid must be unique within the pool. 481 */ 482 guid = spa_generate_guid(spa); 483 } 484 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 485 } 486 487 vd->vdev_spa = spa; 488 vd->vdev_id = id; 489 vd->vdev_guid = guid; 490 vd->vdev_guid_sum = guid; 491 vd->vdev_ops = ops; 492 vd->vdev_state = VDEV_STATE_CLOSED; 493 vd->vdev_ishole = (ops == &vdev_hole_ops); 494 vic->vic_prev_indirect_vdev = UINT64_MAX; 495 496 rw_init(&vd->vdev_indirect_rwlock, NULL, RW_DEFAULT, NULL); 497 mutex_init(&vd->vdev_obsolete_lock, NULL, MUTEX_DEFAULT, NULL); 498 vd->vdev_obsolete_segments = range_tree_create(NULL, NULL); 499 500 list_link_init(&vd->vdev_leaf_node); 501 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 502 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 503 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 504 mutex_init(&vd->vdev_initialize_lock, NULL, MUTEX_DEFAULT, NULL); 505 mutex_init(&vd->vdev_initialize_io_lock, NULL, MUTEX_DEFAULT, NULL); 506 cv_init(&vd->vdev_initialize_cv, NULL, CV_DEFAULT, NULL); 507 cv_init(&vd->vdev_initialize_io_cv, NULL, CV_DEFAULT, NULL); 508 509 for (int t = 0; t < DTL_TYPES; t++) { 510 vd->vdev_dtl[t] = range_tree_create(NULL, NULL); 511 } 512 txg_list_create(&vd->vdev_ms_list, spa, 513 offsetof(struct metaslab, ms_txg_node)); 514 txg_list_create(&vd->vdev_dtl_list, spa, 515 offsetof(struct vdev, vdev_dtl_node)); 516 vd->vdev_stat.vs_timestamp = gethrtime(); 517 vdev_queue_init(vd); 518 vdev_cache_init(vd); 519 520 return (vd); 521 } 522 523 /* 524 * Allocate a new vdev. The 'alloctype' is used to control whether we are 525 * creating a new vdev or loading an existing one - the behavior is slightly 526 * different for each case. 527 */ 528 int 529 vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 530 int alloctype) 531 { 532 vdev_ops_t *ops; 533 char *type; 534 uint64_t guid = 0, islog, nparity; 535 vdev_t *vd; 536 vdev_indirect_config_t *vic; 537 vdev_alloc_bias_t alloc_bias = VDEV_BIAS_NONE; 538 boolean_t top_level = (parent && !parent->vdev_parent); 539 540 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 541 542 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 543 return (SET_ERROR(EINVAL)); 544 545 if ((ops = vdev_getops(type)) == NULL) 546 return (SET_ERROR(EINVAL)); 547 548 /* 549 * If this is a load, get the vdev guid from the nvlist. 550 * Otherwise, vdev_alloc_common() will generate one for us. 551 */ 552 if (alloctype == VDEV_ALLOC_LOAD) { 553 uint64_t label_id; 554 555 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 556 label_id != id) 557 return (SET_ERROR(EINVAL)); 558 559 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 560 return (SET_ERROR(EINVAL)); 561 } else if (alloctype == VDEV_ALLOC_SPARE) { 562 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 563 return (SET_ERROR(EINVAL)); 564 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 565 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 566 return (SET_ERROR(EINVAL)); 567 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 568 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 569 return (SET_ERROR(EINVAL)); 570 } 571 572 /* 573 * The first allocated vdev must be of type 'root'. 574 */ 575 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 576 return (SET_ERROR(EINVAL)); 577 578 /* 579 * Determine whether we're a log vdev. 580 */ 581 islog = 0; 582 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 583 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 584 return (SET_ERROR(ENOTSUP)); 585 586 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 587 return (SET_ERROR(ENOTSUP)); 588 589 /* 590 * Set the nparity property for RAID-Z vdevs. 591 */ 592 nparity = -1ULL; 593 if (ops == &vdev_raidz_ops) { 594 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 595 &nparity) == 0) { 596 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 597 return (SET_ERROR(EINVAL)); 598 /* 599 * Previous versions could only support 1 or 2 parity 600 * device. 601 */ 602 if (nparity > 1 && 603 spa_version(spa) < SPA_VERSION_RAIDZ2) 604 return (SET_ERROR(ENOTSUP)); 605 if (nparity > 2 && 606 spa_version(spa) < SPA_VERSION_RAIDZ3) 607 return (SET_ERROR(ENOTSUP)); 608 } else { 609 /* 610 * We require the parity to be specified for SPAs that 611 * support multiple parity levels. 612 */ 613 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 614 return (SET_ERROR(EINVAL)); 615 /* 616 * Otherwise, we default to 1 parity device for RAID-Z. 617 */ 618 nparity = 1; 619 } 620 } else { 621 nparity = 0; 622 } 623 ASSERT(nparity != -1ULL); 624 625 /* 626 * If creating a top-level vdev, check for allocation classes input 627 */ 628 if (top_level && alloctype == VDEV_ALLOC_ADD) { 629 char *bias; 630 631 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_ALLOCATION_BIAS, 632 &bias) == 0) { 633 alloc_bias = vdev_derive_alloc_bias(bias); 634 635 /* spa_vdev_add() expects feature to be enabled */ 636 if (spa->spa_load_state != SPA_LOAD_CREATE && 637 !spa_feature_is_enabled(spa, 638 SPA_FEATURE_ALLOCATION_CLASSES)) { 639 return (SET_ERROR(ENOTSUP)); 640 } 641 } 642 } 643 644 vd = vdev_alloc_common(spa, id, guid, ops); 645 vic = &vd->vdev_indirect_config; 646 647 vd->vdev_islog = islog; 648 vd->vdev_nparity = nparity; 649 if (top_level && alloc_bias != VDEV_BIAS_NONE) 650 vd->vdev_alloc_bias = alloc_bias; 651 652 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 653 vd->vdev_path = spa_strdup(vd->vdev_path); 654 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 655 vd->vdev_devid = spa_strdup(vd->vdev_devid); 656 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 657 &vd->vdev_physpath) == 0) 658 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 659 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 660 vd->vdev_fru = spa_strdup(vd->vdev_fru); 661 662 /* 663 * Set the whole_disk property. If it's not specified, leave the value 664 * as -1. 665 */ 666 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 667 &vd->vdev_wholedisk) != 0) 668 vd->vdev_wholedisk = -1ULL; 669 670 ASSERT0(vic->vic_mapping_object); 671 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_INDIRECT_OBJECT, 672 &vic->vic_mapping_object); 673 ASSERT0(vic->vic_births_object); 674 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_INDIRECT_BIRTHS, 675 &vic->vic_births_object); 676 ASSERT3U(vic->vic_prev_indirect_vdev, ==, UINT64_MAX); 677 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_PREV_INDIRECT_VDEV, 678 &vic->vic_prev_indirect_vdev); 679 680 /* 681 * Look for the 'not present' flag. This will only be set if the device 682 * was not present at the time of import. 683 */ 684 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 685 &vd->vdev_not_present); 686 687 /* 688 * Get the alignment requirement. 689 */ 690 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 691 692 /* 693 * Retrieve the vdev creation time. 694 */ 695 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 696 &vd->vdev_crtxg); 697 698 /* 699 * If we're a top-level vdev, try to load the allocation parameters. 700 */ 701 if (top_level && 702 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 703 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 704 &vd->vdev_ms_array); 705 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 706 &vd->vdev_ms_shift); 707 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 708 &vd->vdev_asize); 709 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 710 &vd->vdev_removing); 711 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_VDEV_TOP_ZAP, 712 &vd->vdev_top_zap); 713 } else { 714 ASSERT0(vd->vdev_top_zap); 715 } 716 717 if (top_level && alloctype != VDEV_ALLOC_ATTACH) { 718 ASSERT(alloctype == VDEV_ALLOC_LOAD || 719 alloctype == VDEV_ALLOC_ADD || 720 alloctype == VDEV_ALLOC_SPLIT || 721 alloctype == VDEV_ALLOC_ROOTPOOL); 722 /* Note: metaslab_group_create() is now deferred */ 723 } 724 725 if (vd->vdev_ops->vdev_op_leaf && 726 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 727 (void) nvlist_lookup_uint64(nv, 728 ZPOOL_CONFIG_VDEV_LEAF_ZAP, &vd->vdev_leaf_zap); 729 } else { 730 ASSERT0(vd->vdev_leaf_zap); 731 } 732 733 /* 734 * If we're a leaf vdev, try to load the DTL object and other state. 735 */ 736 737 if (vd->vdev_ops->vdev_op_leaf && 738 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 739 alloctype == VDEV_ALLOC_ROOTPOOL)) { 740 if (alloctype == VDEV_ALLOC_LOAD) { 741 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 742 &vd->vdev_dtl_object); 743 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 744 &vd->vdev_unspare); 745 } 746 747 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 748 uint64_t spare = 0; 749 750 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 751 &spare) == 0 && spare) 752 spa_spare_add(vd); 753 } 754 755 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 756 &vd->vdev_offline); 757 758 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 759 &vd->vdev_resilver_txg); 760 761 /* 762 * When importing a pool, we want to ignore the persistent fault 763 * state, as the diagnosis made on another system may not be 764 * valid in the current context. Local vdevs will 765 * remain in the faulted state. 766 */ 767 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 768 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 769 &vd->vdev_faulted); 770 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 771 &vd->vdev_degraded); 772 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 773 &vd->vdev_removed); 774 775 if (vd->vdev_faulted || vd->vdev_degraded) { 776 char *aux; 777 778 vd->vdev_label_aux = 779 VDEV_AUX_ERR_EXCEEDED; 780 if (nvlist_lookup_string(nv, 781 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 782 strcmp(aux, "external") == 0) 783 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 784 } 785 } 786 } 787 788 /* 789 * Add ourselves to the parent's list of children. 790 */ 791 vdev_add_child(parent, vd); 792 793 *vdp = vd; 794 795 return (0); 796 } 797 798 void 799 vdev_free(vdev_t *vd) 800 { 801 spa_t *spa = vd->vdev_spa; 802 ASSERT3P(vd->vdev_initialize_thread, ==, NULL); 803 804 /* 805 * vdev_free() implies closing the vdev first. This is simpler than 806 * trying to ensure complicated semantics for all callers. 807 */ 808 vdev_close(vd); 809 810 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 811 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 812 813 /* 814 * Free all children. 815 */ 816 for (int c = 0; c < vd->vdev_children; c++) 817 vdev_free(vd->vdev_child[c]); 818 819 ASSERT(vd->vdev_child == NULL); 820 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 821 ASSERT(vd->vdev_initialize_thread == NULL); 822 823 /* 824 * Discard allocation state. 825 */ 826 if (vd->vdev_mg != NULL) { 827 vdev_metaslab_fini(vd); 828 metaslab_group_destroy(vd->vdev_mg); 829 } 830 831 ASSERT0(vd->vdev_stat.vs_space); 832 ASSERT0(vd->vdev_stat.vs_dspace); 833 ASSERT0(vd->vdev_stat.vs_alloc); 834 835 /* 836 * Remove this vdev from its parent's child list. 837 */ 838 vdev_remove_child(vd->vdev_parent, vd); 839 840 ASSERT(vd->vdev_parent == NULL); 841 ASSERT(!list_link_active(&vd->vdev_leaf_node)); 842 843 /* 844 * Clean up vdev structure. 845 */ 846 vdev_queue_fini(vd); 847 vdev_cache_fini(vd); 848 849 if (vd->vdev_path) 850 spa_strfree(vd->vdev_path); 851 if (vd->vdev_devid) 852 spa_strfree(vd->vdev_devid); 853 if (vd->vdev_physpath) 854 spa_strfree(vd->vdev_physpath); 855 if (vd->vdev_fru) 856 spa_strfree(vd->vdev_fru); 857 858 if (vd->vdev_isspare) 859 spa_spare_remove(vd); 860 if (vd->vdev_isl2cache) 861 spa_l2cache_remove(vd); 862 863 txg_list_destroy(&vd->vdev_ms_list); 864 txg_list_destroy(&vd->vdev_dtl_list); 865 866 mutex_enter(&vd->vdev_dtl_lock); 867 space_map_close(vd->vdev_dtl_sm); 868 for (int t = 0; t < DTL_TYPES; t++) { 869 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 870 range_tree_destroy(vd->vdev_dtl[t]); 871 } 872 mutex_exit(&vd->vdev_dtl_lock); 873 874 EQUIV(vd->vdev_indirect_births != NULL, 875 vd->vdev_indirect_mapping != NULL); 876 if (vd->vdev_indirect_births != NULL) { 877 vdev_indirect_mapping_close(vd->vdev_indirect_mapping); 878 vdev_indirect_births_close(vd->vdev_indirect_births); 879 } 880 881 if (vd->vdev_obsolete_sm != NULL) { 882 ASSERT(vd->vdev_removing || 883 vd->vdev_ops == &vdev_indirect_ops); 884 space_map_close(vd->vdev_obsolete_sm); 885 vd->vdev_obsolete_sm = NULL; 886 } 887 range_tree_destroy(vd->vdev_obsolete_segments); 888 rw_destroy(&vd->vdev_indirect_rwlock); 889 mutex_destroy(&vd->vdev_obsolete_lock); 890 891 mutex_destroy(&vd->vdev_dtl_lock); 892 mutex_destroy(&vd->vdev_stat_lock); 893 mutex_destroy(&vd->vdev_probe_lock); 894 mutex_destroy(&vd->vdev_initialize_lock); 895 mutex_destroy(&vd->vdev_initialize_io_lock); 896 cv_destroy(&vd->vdev_initialize_io_cv); 897 cv_destroy(&vd->vdev_initialize_cv); 898 899 if (vd == spa->spa_root_vdev) 900 spa->spa_root_vdev = NULL; 901 902 kmem_free(vd, sizeof (vdev_t)); 903 } 904 905 /* 906 * Transfer top-level vdev state from svd to tvd. 907 */ 908 static void 909 vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 910 { 911 spa_t *spa = svd->vdev_spa; 912 metaslab_t *msp; 913 vdev_t *vd; 914 int t; 915 916 ASSERT(tvd == tvd->vdev_top); 917 918 tvd->vdev_ms_array = svd->vdev_ms_array; 919 tvd->vdev_ms_shift = svd->vdev_ms_shift; 920 tvd->vdev_ms_count = svd->vdev_ms_count; 921 tvd->vdev_top_zap = svd->vdev_top_zap; 922 923 svd->vdev_ms_array = 0; 924 svd->vdev_ms_shift = 0; 925 svd->vdev_ms_count = 0; 926 svd->vdev_top_zap = 0; 927 928 if (tvd->vdev_mg) 929 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 930 tvd->vdev_mg = svd->vdev_mg; 931 tvd->vdev_ms = svd->vdev_ms; 932 933 svd->vdev_mg = NULL; 934 svd->vdev_ms = NULL; 935 936 if (tvd->vdev_mg != NULL) 937 tvd->vdev_mg->mg_vd = tvd; 938 939 tvd->vdev_checkpoint_sm = svd->vdev_checkpoint_sm; 940 svd->vdev_checkpoint_sm = NULL; 941 942 tvd->vdev_alloc_bias = svd->vdev_alloc_bias; 943 svd->vdev_alloc_bias = VDEV_BIAS_NONE; 944 945 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 946 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 947 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 948 949 svd->vdev_stat.vs_alloc = 0; 950 svd->vdev_stat.vs_space = 0; 951 svd->vdev_stat.vs_dspace = 0; 952 953 /* 954 * State which may be set on a top-level vdev that's in the 955 * process of being removed. 956 */ 957 ASSERT0(tvd->vdev_indirect_config.vic_births_object); 958 ASSERT0(tvd->vdev_indirect_config.vic_mapping_object); 959 ASSERT3U(tvd->vdev_indirect_config.vic_prev_indirect_vdev, ==, -1ULL); 960 ASSERT3P(tvd->vdev_indirect_mapping, ==, NULL); 961 ASSERT3P(tvd->vdev_indirect_births, ==, NULL); 962 ASSERT3P(tvd->vdev_obsolete_sm, ==, NULL); 963 ASSERT0(tvd->vdev_removing); 964 tvd->vdev_removing = svd->vdev_removing; 965 tvd->vdev_indirect_config = svd->vdev_indirect_config; 966 tvd->vdev_indirect_mapping = svd->vdev_indirect_mapping; 967 tvd->vdev_indirect_births = svd->vdev_indirect_births; 968 range_tree_swap(&svd->vdev_obsolete_segments, 969 &tvd->vdev_obsolete_segments); 970 tvd->vdev_obsolete_sm = svd->vdev_obsolete_sm; 971 svd->vdev_indirect_config.vic_mapping_object = 0; 972 svd->vdev_indirect_config.vic_births_object = 0; 973 svd->vdev_indirect_config.vic_prev_indirect_vdev = -1ULL; 974 svd->vdev_indirect_mapping = NULL; 975 svd->vdev_indirect_births = NULL; 976 svd->vdev_obsolete_sm = NULL; 977 svd->vdev_removing = 0; 978 979 for (t = 0; t < TXG_SIZE; t++) { 980 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 981 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 982 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 983 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 984 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 985 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 986 } 987 988 if (list_link_active(&svd->vdev_config_dirty_node)) { 989 vdev_config_clean(svd); 990 vdev_config_dirty(tvd); 991 } 992 993 if (list_link_active(&svd->vdev_state_dirty_node)) { 994 vdev_state_clean(svd); 995 vdev_state_dirty(tvd); 996 } 997 998 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 999 svd->vdev_deflate_ratio = 0; 1000 1001 tvd->vdev_islog = svd->vdev_islog; 1002 svd->vdev_islog = 0; 1003 } 1004 1005 static void 1006 vdev_top_update(vdev_t *tvd, vdev_t *vd) 1007 { 1008 if (vd == NULL) 1009 return; 1010 1011 vd->vdev_top = tvd; 1012 1013 for (int c = 0; c < vd->vdev_children; c++) 1014 vdev_top_update(tvd, vd->vdev_child[c]); 1015 } 1016 1017 /* 1018 * Add a mirror/replacing vdev above an existing vdev. 1019 */ 1020 vdev_t * 1021 vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 1022 { 1023 spa_t *spa = cvd->vdev_spa; 1024 vdev_t *pvd = cvd->vdev_parent; 1025 vdev_t *mvd; 1026 1027 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1028 1029 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 1030 1031 mvd->vdev_asize = cvd->vdev_asize; 1032 mvd->vdev_min_asize = cvd->vdev_min_asize; 1033 mvd->vdev_max_asize = cvd->vdev_max_asize; 1034 mvd->vdev_psize = cvd->vdev_psize; 1035 mvd->vdev_ashift = cvd->vdev_ashift; 1036 mvd->vdev_state = cvd->vdev_state; 1037 mvd->vdev_crtxg = cvd->vdev_crtxg; 1038 1039 vdev_remove_child(pvd, cvd); 1040 vdev_add_child(pvd, mvd); 1041 cvd->vdev_id = mvd->vdev_children; 1042 vdev_add_child(mvd, cvd); 1043 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 1044 1045 if (mvd == mvd->vdev_top) 1046 vdev_top_transfer(cvd, mvd); 1047 1048 return (mvd); 1049 } 1050 1051 /* 1052 * Remove a 1-way mirror/replacing vdev from the tree. 1053 */ 1054 void 1055 vdev_remove_parent(vdev_t *cvd) 1056 { 1057 vdev_t *mvd = cvd->vdev_parent; 1058 vdev_t *pvd = mvd->vdev_parent; 1059 1060 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1061 1062 ASSERT(mvd->vdev_children == 1); 1063 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 1064 mvd->vdev_ops == &vdev_replacing_ops || 1065 mvd->vdev_ops == &vdev_spare_ops); 1066 cvd->vdev_ashift = mvd->vdev_ashift; 1067 1068 vdev_remove_child(mvd, cvd); 1069 vdev_remove_child(pvd, mvd); 1070 1071 /* 1072 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 1073 * Otherwise, we could have detached an offline device, and when we 1074 * go to import the pool we'll think we have two top-level vdevs, 1075 * instead of a different version of the same top-level vdev. 1076 */ 1077 if (mvd->vdev_top == mvd) { 1078 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 1079 cvd->vdev_orig_guid = cvd->vdev_guid; 1080 cvd->vdev_guid += guid_delta; 1081 cvd->vdev_guid_sum += guid_delta; 1082 } 1083 cvd->vdev_id = mvd->vdev_id; 1084 vdev_add_child(pvd, cvd); 1085 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 1086 1087 if (cvd == cvd->vdev_top) 1088 vdev_top_transfer(mvd, cvd); 1089 1090 ASSERT(mvd->vdev_children == 0); 1091 vdev_free(mvd); 1092 } 1093 1094 static void 1095 vdev_metaslab_group_create(vdev_t *vd) 1096 { 1097 spa_t *spa = vd->vdev_spa; 1098 1099 /* 1100 * metaslab_group_create was delayed until allocation bias was available 1101 */ 1102 if (vd->vdev_mg == NULL) { 1103 metaslab_class_t *mc; 1104 1105 if (vd->vdev_islog && vd->vdev_alloc_bias == VDEV_BIAS_NONE) 1106 vd->vdev_alloc_bias = VDEV_BIAS_LOG; 1107 1108 ASSERT3U(vd->vdev_islog, ==, 1109 (vd->vdev_alloc_bias == VDEV_BIAS_LOG)); 1110 1111 switch (vd->vdev_alloc_bias) { 1112 case VDEV_BIAS_LOG: 1113 mc = spa_log_class(spa); 1114 break; 1115 case VDEV_BIAS_SPECIAL: 1116 mc = spa_special_class(spa); 1117 break; 1118 case VDEV_BIAS_DEDUP: 1119 mc = spa_dedup_class(spa); 1120 break; 1121 default: 1122 mc = spa_normal_class(spa); 1123 } 1124 1125 vd->vdev_mg = metaslab_group_create(mc, vd, 1126 spa->spa_alloc_count); 1127 1128 /* 1129 * The spa ashift values currently only reflect the 1130 * general vdev classes. Class destination is late 1131 * binding so ashift checking had to wait until now 1132 */ 1133 if (vd->vdev_top == vd && vd->vdev_ashift != 0 && 1134 mc == spa_normal_class(spa) && vd->vdev_aux == NULL) { 1135 if (vd->vdev_ashift > spa->spa_max_ashift) 1136 spa->spa_max_ashift = vd->vdev_ashift; 1137 if (vd->vdev_ashift < spa->spa_min_ashift) 1138 spa->spa_min_ashift = vd->vdev_ashift; 1139 } 1140 } 1141 } 1142 1143 int 1144 vdev_metaslab_init(vdev_t *vd, uint64_t txg) 1145 { 1146 spa_t *spa = vd->vdev_spa; 1147 objset_t *mos = spa->spa_meta_objset; 1148 uint64_t m; 1149 uint64_t oldc = vd->vdev_ms_count; 1150 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 1151 metaslab_t **mspp; 1152 int error; 1153 boolean_t expanding = (oldc != 0); 1154 1155 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1156 1157 /* 1158 * This vdev is not being allocated from yet or is a hole. 1159 */ 1160 if (vd->vdev_ms_shift == 0) 1161 return (0); 1162 1163 ASSERT(!vd->vdev_ishole); 1164 1165 ASSERT(oldc <= newc); 1166 1167 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 1168 1169 if (expanding) { 1170 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 1171 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 1172 } 1173 1174 vd->vdev_ms = mspp; 1175 vd->vdev_ms_count = newc; 1176 for (m = oldc; m < newc; m++) { 1177 uint64_t object = 0; 1178 1179 /* 1180 * vdev_ms_array may be 0 if we are creating the "fake" 1181 * metaslabs for an indirect vdev for zdb's leak detection. 1182 * See zdb_leak_init(). 1183 */ 1184 if (txg == 0 && vd->vdev_ms_array != 0) { 1185 error = dmu_read(mos, vd->vdev_ms_array, 1186 m * sizeof (uint64_t), sizeof (uint64_t), &object, 1187 DMU_READ_PREFETCH); 1188 if (error != 0) { 1189 vdev_dbgmsg(vd, "unable to read the metaslab " 1190 "array [error=%d]", error); 1191 return (error); 1192 } 1193 } 1194 1195 #ifndef _KERNEL 1196 /* 1197 * To accomodate zdb_leak_init() fake indirect 1198 * metaslabs, we allocate a metaslab group for 1199 * indirect vdevs which normally don't have one. 1200 */ 1201 if (vd->vdev_mg == NULL) { 1202 ASSERT0(vdev_is_concrete(vd)); 1203 vdev_metaslab_group_create(vd); 1204 } 1205 #endif 1206 error = metaslab_init(vd->vdev_mg, m, object, txg, 1207 &(vd->vdev_ms[m])); 1208 if (error != 0) { 1209 vdev_dbgmsg(vd, "metaslab_init failed [error=%d]", 1210 error); 1211 return (error); 1212 } 1213 } 1214 1215 if (txg == 0) 1216 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 1217 1218 /* 1219 * If the vdev is being removed we don't activate 1220 * the metaslabs since we want to ensure that no new 1221 * allocations are performed on this device. 1222 */ 1223 if (!expanding && !vd->vdev_removing) { 1224 metaslab_group_activate(vd->vdev_mg); 1225 } 1226 1227 if (txg == 0) 1228 spa_config_exit(spa, SCL_ALLOC, FTAG); 1229 1230 return (0); 1231 } 1232 1233 void 1234 vdev_metaslab_fini(vdev_t *vd) 1235 { 1236 if (vd->vdev_checkpoint_sm != NULL) { 1237 ASSERT(spa_feature_is_active(vd->vdev_spa, 1238 SPA_FEATURE_POOL_CHECKPOINT)); 1239 space_map_close(vd->vdev_checkpoint_sm); 1240 /* 1241 * Even though we close the space map, we need to set its 1242 * pointer to NULL. The reason is that vdev_metaslab_fini() 1243 * may be called multiple times for certain operations 1244 * (i.e. when destroying a pool) so we need to ensure that 1245 * this clause never executes twice. This logic is similar 1246 * to the one used for the vdev_ms clause below. 1247 */ 1248 vd->vdev_checkpoint_sm = NULL; 1249 } 1250 1251 if (vd->vdev_ms != NULL) { 1252 metaslab_group_t *mg = vd->vdev_mg; 1253 metaslab_group_passivate(mg); 1254 1255 uint64_t count = vd->vdev_ms_count; 1256 for (uint64_t m = 0; m < count; m++) { 1257 metaslab_t *msp = vd->vdev_ms[m]; 1258 if (msp != NULL) 1259 metaslab_fini(msp); 1260 } 1261 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 1262 vd->vdev_ms = NULL; 1263 1264 vd->vdev_ms_count = 0; 1265 1266 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 1267 ASSERT0(mg->mg_histogram[i]); 1268 } 1269 ASSERT0(vd->vdev_ms_count); 1270 } 1271 1272 typedef struct vdev_probe_stats { 1273 boolean_t vps_readable; 1274 boolean_t vps_writeable; 1275 int vps_flags; 1276 } vdev_probe_stats_t; 1277 1278 static void 1279 vdev_probe_done(zio_t *zio) 1280 { 1281 spa_t *spa = zio->io_spa; 1282 vdev_t *vd = zio->io_vd; 1283 vdev_probe_stats_t *vps = zio->io_private; 1284 1285 ASSERT(vd->vdev_probe_zio != NULL); 1286 1287 if (zio->io_type == ZIO_TYPE_READ) { 1288 if (zio->io_error == 0) 1289 vps->vps_readable = 1; 1290 if (zio->io_error == 0 && spa_writeable(spa)) { 1291 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1292 zio->io_offset, zio->io_size, zio->io_abd, 1293 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1294 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1295 } else { 1296 abd_free(zio->io_abd); 1297 } 1298 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1299 if (zio->io_error == 0) 1300 vps->vps_writeable = 1; 1301 abd_free(zio->io_abd); 1302 } else if (zio->io_type == ZIO_TYPE_NULL) { 1303 zio_t *pio; 1304 1305 vd->vdev_cant_read |= !vps->vps_readable; 1306 vd->vdev_cant_write |= !vps->vps_writeable; 1307 1308 if (vdev_readable(vd) && 1309 (vdev_writeable(vd) || !spa_writeable(spa))) { 1310 zio->io_error = 0; 1311 } else { 1312 ASSERT(zio->io_error != 0); 1313 vdev_dbgmsg(vd, "failed probe"); 1314 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1315 spa, vd, NULL, 0, 0); 1316 zio->io_error = SET_ERROR(ENXIO); 1317 } 1318 1319 mutex_enter(&vd->vdev_probe_lock); 1320 ASSERT(vd->vdev_probe_zio == zio); 1321 vd->vdev_probe_zio = NULL; 1322 mutex_exit(&vd->vdev_probe_lock); 1323 1324 zio_link_t *zl = NULL; 1325 while ((pio = zio_walk_parents(zio, &zl)) != NULL) 1326 if (!vdev_accessible(vd, pio)) 1327 pio->io_error = SET_ERROR(ENXIO); 1328 1329 kmem_free(vps, sizeof (*vps)); 1330 } 1331 } 1332 1333 /* 1334 * Determine whether this device is accessible. 1335 * 1336 * Read and write to several known locations: the pad regions of each 1337 * vdev label but the first, which we leave alone in case it contains 1338 * a VTOC. 1339 */ 1340 zio_t * 1341 vdev_probe(vdev_t *vd, zio_t *zio) 1342 { 1343 spa_t *spa = vd->vdev_spa; 1344 vdev_probe_stats_t *vps = NULL; 1345 zio_t *pio; 1346 1347 ASSERT(vd->vdev_ops->vdev_op_leaf); 1348 1349 /* 1350 * Don't probe the probe. 1351 */ 1352 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1353 return (NULL); 1354 1355 /* 1356 * To prevent 'probe storms' when a device fails, we create 1357 * just one probe i/o at a time. All zios that want to probe 1358 * this vdev will become parents of the probe io. 1359 */ 1360 mutex_enter(&vd->vdev_probe_lock); 1361 1362 if ((pio = vd->vdev_probe_zio) == NULL) { 1363 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1364 1365 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1366 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1367 ZIO_FLAG_TRYHARD; 1368 1369 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1370 /* 1371 * vdev_cant_read and vdev_cant_write can only 1372 * transition from TRUE to FALSE when we have the 1373 * SCL_ZIO lock as writer; otherwise they can only 1374 * transition from FALSE to TRUE. This ensures that 1375 * any zio looking at these values can assume that 1376 * failures persist for the life of the I/O. That's 1377 * important because when a device has intermittent 1378 * connectivity problems, we want to ensure that 1379 * they're ascribed to the device (ENXIO) and not 1380 * the zio (EIO). 1381 * 1382 * Since we hold SCL_ZIO as writer here, clear both 1383 * values so the probe can reevaluate from first 1384 * principles. 1385 */ 1386 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1387 vd->vdev_cant_read = B_FALSE; 1388 vd->vdev_cant_write = B_FALSE; 1389 } 1390 1391 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1392 vdev_probe_done, vps, 1393 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1394 1395 /* 1396 * We can't change the vdev state in this context, so we 1397 * kick off an async task to do it on our behalf. 1398 */ 1399 if (zio != NULL) { 1400 vd->vdev_probe_wanted = B_TRUE; 1401 spa_async_request(spa, SPA_ASYNC_PROBE); 1402 } 1403 } 1404 1405 if (zio != NULL) 1406 zio_add_child(zio, pio); 1407 1408 mutex_exit(&vd->vdev_probe_lock); 1409 1410 if (vps == NULL) { 1411 ASSERT(zio != NULL); 1412 return (NULL); 1413 } 1414 1415 for (int l = 1; l < VDEV_LABELS; l++) { 1416 zio_nowait(zio_read_phys(pio, vd, 1417 vdev_label_offset(vd->vdev_psize, l, 1418 offsetof(vdev_label_t, vl_pad2)), VDEV_PAD_SIZE, 1419 abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE), 1420 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1421 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1422 } 1423 1424 if (zio == NULL) 1425 return (pio); 1426 1427 zio_nowait(pio); 1428 return (NULL); 1429 } 1430 1431 static void 1432 vdev_open_child(void *arg) 1433 { 1434 vdev_t *vd = arg; 1435 1436 vd->vdev_open_thread = curthread; 1437 vd->vdev_open_error = vdev_open(vd); 1438 vd->vdev_open_thread = NULL; 1439 } 1440 1441 boolean_t 1442 vdev_uses_zvols(vdev_t *vd) 1443 { 1444 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1445 strlen(ZVOL_DIR)) == 0) 1446 return (B_TRUE); 1447 for (int c = 0; c < vd->vdev_children; c++) 1448 if (vdev_uses_zvols(vd->vdev_child[c])) 1449 return (B_TRUE); 1450 return (B_FALSE); 1451 } 1452 1453 void 1454 vdev_open_children(vdev_t *vd) 1455 { 1456 taskq_t *tq; 1457 int children = vd->vdev_children; 1458 1459 /* 1460 * in order to handle pools on top of zvols, do the opens 1461 * in a single thread so that the same thread holds the 1462 * spa_namespace_lock 1463 */ 1464 if (vdev_uses_zvols(vd)) { 1465 for (int c = 0; c < children; c++) 1466 vd->vdev_child[c]->vdev_open_error = 1467 vdev_open(vd->vdev_child[c]); 1468 return; 1469 } 1470 tq = taskq_create("vdev_open", children, minclsyspri, 1471 children, children, TASKQ_PREPOPULATE); 1472 1473 for (int c = 0; c < children; c++) 1474 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1475 TQ_SLEEP) != TASKQID_INVALID); 1476 1477 taskq_destroy(tq); 1478 } 1479 1480 /* 1481 * Compute the raidz-deflation ratio. Note, we hard-code 1482 * in 128k (1 << 17) because it is the "typical" blocksize. 1483 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change, 1484 * otherwise it would inconsistently account for existing bp's. 1485 */ 1486 static void 1487 vdev_set_deflate_ratio(vdev_t *vd) 1488 { 1489 if (vd == vd->vdev_top && !vd->vdev_ishole && vd->vdev_ashift != 0) { 1490 vd->vdev_deflate_ratio = (1 << 17) / 1491 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 1492 } 1493 } 1494 1495 /* 1496 * Prepare a virtual device for access. 1497 */ 1498 int 1499 vdev_open(vdev_t *vd) 1500 { 1501 spa_t *spa = vd->vdev_spa; 1502 int error; 1503 uint64_t osize = 0; 1504 uint64_t max_osize = 0; 1505 uint64_t asize, max_asize, psize; 1506 uint64_t ashift = 0; 1507 1508 ASSERT(vd->vdev_open_thread == curthread || 1509 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1510 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1511 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1512 vd->vdev_state == VDEV_STATE_OFFLINE); 1513 1514 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1515 vd->vdev_cant_read = B_FALSE; 1516 vd->vdev_cant_write = B_FALSE; 1517 vd->vdev_min_asize = vdev_get_min_asize(vd); 1518 1519 /* 1520 * If this vdev is not removed, check its fault status. If it's 1521 * faulted, bail out of the open. 1522 */ 1523 if (!vd->vdev_removed && vd->vdev_faulted) { 1524 ASSERT(vd->vdev_children == 0); 1525 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1526 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1527 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1528 vd->vdev_label_aux); 1529 return (SET_ERROR(ENXIO)); 1530 } else if (vd->vdev_offline) { 1531 ASSERT(vd->vdev_children == 0); 1532 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1533 return (SET_ERROR(ENXIO)); 1534 } 1535 1536 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, &ashift); 1537 1538 /* 1539 * Reset the vdev_reopening flag so that we actually close 1540 * the vdev on error. 1541 */ 1542 vd->vdev_reopening = B_FALSE; 1543 if (zio_injection_enabled && error == 0) 1544 error = zio_handle_device_injection(vd, NULL, ENXIO); 1545 1546 if (error) { 1547 if (vd->vdev_removed && 1548 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1549 vd->vdev_removed = B_FALSE; 1550 1551 if (vd->vdev_stat.vs_aux == VDEV_AUX_CHILDREN_OFFLINE) { 1552 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, 1553 vd->vdev_stat.vs_aux); 1554 } else { 1555 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1556 vd->vdev_stat.vs_aux); 1557 } 1558 return (error); 1559 } 1560 1561 vd->vdev_removed = B_FALSE; 1562 1563 /* 1564 * Recheck the faulted flag now that we have confirmed that 1565 * the vdev is accessible. If we're faulted, bail. 1566 */ 1567 if (vd->vdev_faulted) { 1568 ASSERT(vd->vdev_children == 0); 1569 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1570 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1571 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1572 vd->vdev_label_aux); 1573 return (SET_ERROR(ENXIO)); 1574 } 1575 1576 if (vd->vdev_degraded) { 1577 ASSERT(vd->vdev_children == 0); 1578 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1579 VDEV_AUX_ERR_EXCEEDED); 1580 } else { 1581 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1582 } 1583 1584 /* 1585 * For hole or missing vdevs we just return success. 1586 */ 1587 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1588 return (0); 1589 1590 for (int c = 0; c < vd->vdev_children; c++) { 1591 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1592 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1593 VDEV_AUX_NONE); 1594 break; 1595 } 1596 } 1597 1598 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1599 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1600 1601 if (vd->vdev_children == 0) { 1602 if (osize < SPA_MINDEVSIZE) { 1603 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1604 VDEV_AUX_TOO_SMALL); 1605 return (SET_ERROR(EOVERFLOW)); 1606 } 1607 psize = osize; 1608 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1609 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1610 VDEV_LABEL_END_SIZE); 1611 } else { 1612 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1613 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1614 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1615 VDEV_AUX_TOO_SMALL); 1616 return (SET_ERROR(EOVERFLOW)); 1617 } 1618 psize = 0; 1619 asize = osize; 1620 max_asize = max_osize; 1621 } 1622 1623 vd->vdev_psize = psize; 1624 1625 /* 1626 * Make sure the allocatable size hasn't shrunk too much. 1627 */ 1628 if (asize < vd->vdev_min_asize) { 1629 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1630 VDEV_AUX_BAD_LABEL); 1631 return (SET_ERROR(EINVAL)); 1632 } 1633 1634 if (vd->vdev_asize == 0) { 1635 /* 1636 * This is the first-ever open, so use the computed values. 1637 * For testing purposes, a higher ashift can be requested. 1638 */ 1639 vd->vdev_asize = asize; 1640 vd->vdev_max_asize = max_asize; 1641 vd->vdev_ashift = MAX(ashift, vd->vdev_ashift); 1642 vd->vdev_ashift = MAX(zfs_ashift_min, vd->vdev_ashift); 1643 } else { 1644 /* 1645 * Detect if the alignment requirement has increased. 1646 * We don't want to make the pool unavailable, just 1647 * issue a warning instead. 1648 */ 1649 if (ashift > vd->vdev_top->vdev_ashift && 1650 vd->vdev_ops->vdev_op_leaf) { 1651 cmn_err(CE_WARN, 1652 "Disk, '%s', has a block alignment that is " 1653 "larger than the pool's alignment\n", 1654 vd->vdev_path); 1655 } 1656 vd->vdev_max_asize = max_asize; 1657 } 1658 1659 /* 1660 * If all children are healthy we update asize if either: 1661 * The asize has increased, due to a device expansion caused by dynamic 1662 * LUN growth or vdev replacement, and automatic expansion is enabled; 1663 * making the additional space available. 1664 * 1665 * The asize has decreased, due to a device shrink usually caused by a 1666 * vdev replace with a smaller device. This ensures that calculations 1667 * based of max_asize and asize e.g. esize are always valid. It's safe 1668 * to do this as we've already validated that asize is greater than 1669 * vdev_min_asize. 1670 */ 1671 if (vd->vdev_state == VDEV_STATE_HEALTHY && 1672 ((asize > vd->vdev_asize && 1673 (vd->vdev_expanding || spa->spa_autoexpand)) || 1674 (asize < vd->vdev_asize))) 1675 vd->vdev_asize = asize; 1676 1677 vdev_set_min_asize(vd); 1678 1679 /* 1680 * Ensure we can issue some IO before declaring the 1681 * vdev open for business. 1682 */ 1683 if (vd->vdev_ops->vdev_op_leaf && 1684 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1685 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1686 VDEV_AUX_ERR_EXCEEDED); 1687 return (error); 1688 } 1689 1690 /* 1691 * Track the min and max ashift values for normal data devices. 1692 * 1693 * DJB - TBD these should perhaps be tracked per allocation class 1694 * (e.g. spa_min_ashift is used to round up post compression buffers) 1695 */ 1696 if (vd->vdev_top == vd && vd->vdev_ashift != 0 && 1697 vd->vdev_alloc_bias == VDEV_BIAS_NONE && 1698 vd->vdev_aux == NULL) { 1699 if (vd->vdev_ashift > spa->spa_max_ashift) 1700 spa->spa_max_ashift = vd->vdev_ashift; 1701 if (vd->vdev_ashift < spa->spa_min_ashift) 1702 spa->spa_min_ashift = vd->vdev_ashift; 1703 } 1704 1705 /* 1706 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1707 * resilver. But don't do this if we are doing a reopen for a scrub, 1708 * since this would just restart the scrub we are already doing. 1709 */ 1710 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1711 vdev_resilver_needed(vd, NULL, NULL)) 1712 spa_async_request(spa, SPA_ASYNC_RESILVER); 1713 1714 return (0); 1715 } 1716 1717 /* 1718 * Called once the vdevs are all opened, this routine validates the label 1719 * contents. This needs to be done before vdev_load() so that we don't 1720 * inadvertently do repair I/Os to the wrong device. 1721 * 1722 * This function will only return failure if one of the vdevs indicates that it 1723 * has since been destroyed or exported. This is only possible if 1724 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1725 * will be updated but the function will return 0. 1726 */ 1727 int 1728 vdev_validate(vdev_t *vd) 1729 { 1730 spa_t *spa = vd->vdev_spa; 1731 nvlist_t *label; 1732 uint64_t guid = 0, aux_guid = 0, top_guid; 1733 uint64_t state; 1734 nvlist_t *nvl; 1735 uint64_t txg; 1736 1737 if (vdev_validate_skip) 1738 return (0); 1739 1740 for (uint64_t c = 0; c < vd->vdev_children; c++) 1741 if (vdev_validate(vd->vdev_child[c]) != 0) 1742 return (SET_ERROR(EBADF)); 1743 1744 /* 1745 * If the device has already failed, or was marked offline, don't do 1746 * any further validation. Otherwise, label I/O will fail and we will 1747 * overwrite the previous state. 1748 */ 1749 if (!vd->vdev_ops->vdev_op_leaf || !vdev_readable(vd)) 1750 return (0); 1751 1752 /* 1753 * If we are performing an extreme rewind, we allow for a label that 1754 * was modified at a point after the current txg. 1755 * If config lock is not held do not check for the txg. spa_sync could 1756 * be updating the vdev's label before updating spa_last_synced_txg. 1757 */ 1758 if (spa->spa_extreme_rewind || spa_last_synced_txg(spa) == 0 || 1759 spa_config_held(spa, SCL_CONFIG, RW_WRITER) != SCL_CONFIG) 1760 txg = UINT64_MAX; 1761 else 1762 txg = spa_last_synced_txg(spa); 1763 1764 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1765 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1766 VDEV_AUX_BAD_LABEL); 1767 vdev_dbgmsg(vd, "vdev_validate: failed reading config for " 1768 "txg %llu", (u_longlong_t)txg); 1769 return (0); 1770 } 1771 1772 /* 1773 * Determine if this vdev has been split off into another 1774 * pool. If so, then refuse to open it. 1775 */ 1776 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1777 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1778 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1779 VDEV_AUX_SPLIT_POOL); 1780 nvlist_free(label); 1781 vdev_dbgmsg(vd, "vdev_validate: vdev split into other pool"); 1782 return (0); 1783 } 1784 1785 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, &guid) != 0) { 1786 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1787 VDEV_AUX_CORRUPT_DATA); 1788 nvlist_free(label); 1789 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1790 ZPOOL_CONFIG_POOL_GUID); 1791 return (0); 1792 } 1793 1794 /* 1795 * If config is not trusted then ignore the spa guid check. This is 1796 * necessary because if the machine crashed during a re-guid the new 1797 * guid might have been written to all of the vdev labels, but not the 1798 * cached config. The check will be performed again once we have the 1799 * trusted config from the MOS. 1800 */ 1801 if (spa->spa_trust_config && guid != spa_guid(spa)) { 1802 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1803 VDEV_AUX_CORRUPT_DATA); 1804 nvlist_free(label); 1805 vdev_dbgmsg(vd, "vdev_validate: vdev label pool_guid doesn't " 1806 "match config (%llu != %llu)", (u_longlong_t)guid, 1807 (u_longlong_t)spa_guid(spa)); 1808 return (0); 1809 } 1810 1811 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1812 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1813 &aux_guid) != 0) 1814 aux_guid = 0; 1815 1816 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0) { 1817 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1818 VDEV_AUX_CORRUPT_DATA); 1819 nvlist_free(label); 1820 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1821 ZPOOL_CONFIG_GUID); 1822 return (0); 1823 } 1824 1825 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, &top_guid) 1826 != 0) { 1827 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1828 VDEV_AUX_CORRUPT_DATA); 1829 nvlist_free(label); 1830 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1831 ZPOOL_CONFIG_TOP_GUID); 1832 return (0); 1833 } 1834 1835 /* 1836 * If this vdev just became a top-level vdev because its sibling was 1837 * detached, it will have adopted the parent's vdev guid -- but the 1838 * label may or may not be on disk yet. Fortunately, either version 1839 * of the label will have the same top guid, so if we're a top-level 1840 * vdev, we can safely compare to that instead. 1841 * However, if the config comes from a cachefile that failed to update 1842 * after the detach, a top-level vdev will appear as a non top-level 1843 * vdev in the config. Also relax the constraints if we perform an 1844 * extreme rewind. 1845 * 1846 * If we split this vdev off instead, then we also check the 1847 * original pool's guid. We don't want to consider the vdev 1848 * corrupt if it is partway through a split operation. 1849 */ 1850 if (vd->vdev_guid != guid && vd->vdev_guid != aux_guid) { 1851 boolean_t mismatch = B_FALSE; 1852 if (spa->spa_trust_config && !spa->spa_extreme_rewind) { 1853 if (vd != vd->vdev_top || vd->vdev_guid != top_guid) 1854 mismatch = B_TRUE; 1855 } else { 1856 if (vd->vdev_guid != top_guid && 1857 vd->vdev_top->vdev_guid != guid) 1858 mismatch = B_TRUE; 1859 } 1860 1861 if (mismatch) { 1862 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1863 VDEV_AUX_CORRUPT_DATA); 1864 nvlist_free(label); 1865 vdev_dbgmsg(vd, "vdev_validate: config guid " 1866 "doesn't match label guid"); 1867 vdev_dbgmsg(vd, "CONFIG: guid %llu, top_guid %llu", 1868 (u_longlong_t)vd->vdev_guid, 1869 (u_longlong_t)vd->vdev_top->vdev_guid); 1870 vdev_dbgmsg(vd, "LABEL: guid %llu, top_guid %llu, " 1871 "aux_guid %llu", (u_longlong_t)guid, 1872 (u_longlong_t)top_guid, (u_longlong_t)aux_guid); 1873 return (0); 1874 } 1875 } 1876 1877 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1878 &state) != 0) { 1879 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1880 VDEV_AUX_CORRUPT_DATA); 1881 nvlist_free(label); 1882 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1883 ZPOOL_CONFIG_POOL_STATE); 1884 return (0); 1885 } 1886 1887 nvlist_free(label); 1888 1889 /* 1890 * If this is a verbatim import, no need to check the 1891 * state of the pool. 1892 */ 1893 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1894 spa_load_state(spa) == SPA_LOAD_OPEN && 1895 state != POOL_STATE_ACTIVE) { 1896 vdev_dbgmsg(vd, "vdev_validate: invalid pool state (%llu) " 1897 "for spa %s", (u_longlong_t)state, spa->spa_name); 1898 return (SET_ERROR(EBADF)); 1899 } 1900 1901 /* 1902 * If we were able to open and validate a vdev that was 1903 * previously marked permanently unavailable, clear that state 1904 * now. 1905 */ 1906 if (vd->vdev_not_present) 1907 vd->vdev_not_present = 0; 1908 1909 return (0); 1910 } 1911 1912 static void 1913 vdev_copy_path_impl(vdev_t *svd, vdev_t *dvd) 1914 { 1915 if (svd->vdev_path != NULL && dvd->vdev_path != NULL) { 1916 if (strcmp(svd->vdev_path, dvd->vdev_path) != 0) { 1917 zfs_dbgmsg("vdev_copy_path: vdev %llu: path changed " 1918 "from '%s' to '%s'", (u_longlong_t)dvd->vdev_guid, 1919 dvd->vdev_path, svd->vdev_path); 1920 spa_strfree(dvd->vdev_path); 1921 dvd->vdev_path = spa_strdup(svd->vdev_path); 1922 } 1923 } else if (svd->vdev_path != NULL) { 1924 dvd->vdev_path = spa_strdup(svd->vdev_path); 1925 zfs_dbgmsg("vdev_copy_path: vdev %llu: path set to '%s'", 1926 (u_longlong_t)dvd->vdev_guid, dvd->vdev_path); 1927 } 1928 } 1929 1930 /* 1931 * Recursively copy vdev paths from one vdev to another. Source and destination 1932 * vdev trees must have same geometry otherwise return error. Intended to copy 1933 * paths from userland config into MOS config. 1934 */ 1935 int 1936 vdev_copy_path_strict(vdev_t *svd, vdev_t *dvd) 1937 { 1938 if ((svd->vdev_ops == &vdev_missing_ops) || 1939 (svd->vdev_ishole && dvd->vdev_ishole) || 1940 (dvd->vdev_ops == &vdev_indirect_ops)) 1941 return (0); 1942 1943 if (svd->vdev_ops != dvd->vdev_ops) { 1944 vdev_dbgmsg(svd, "vdev_copy_path: vdev type mismatch: %s != %s", 1945 svd->vdev_ops->vdev_op_type, dvd->vdev_ops->vdev_op_type); 1946 return (SET_ERROR(EINVAL)); 1947 } 1948 1949 if (svd->vdev_guid != dvd->vdev_guid) { 1950 vdev_dbgmsg(svd, "vdev_copy_path: guids mismatch (%llu != " 1951 "%llu)", (u_longlong_t)svd->vdev_guid, 1952 (u_longlong_t)dvd->vdev_guid); 1953 return (SET_ERROR(EINVAL)); 1954 } 1955 1956 if (svd->vdev_children != dvd->vdev_children) { 1957 vdev_dbgmsg(svd, "vdev_copy_path: children count mismatch: " 1958 "%llu != %llu", (u_longlong_t)svd->vdev_children, 1959 (u_longlong_t)dvd->vdev_children); 1960 return (SET_ERROR(EINVAL)); 1961 } 1962 1963 for (uint64_t i = 0; i < svd->vdev_children; i++) { 1964 int error = vdev_copy_path_strict(svd->vdev_child[i], 1965 dvd->vdev_child[i]); 1966 if (error != 0) 1967 return (error); 1968 } 1969 1970 if (svd->vdev_ops->vdev_op_leaf) 1971 vdev_copy_path_impl(svd, dvd); 1972 1973 return (0); 1974 } 1975 1976 static void 1977 vdev_copy_path_search(vdev_t *stvd, vdev_t *dvd) 1978 { 1979 ASSERT(stvd->vdev_top == stvd); 1980 ASSERT3U(stvd->vdev_id, ==, dvd->vdev_top->vdev_id); 1981 1982 for (uint64_t i = 0; i < dvd->vdev_children; i++) { 1983 vdev_copy_path_search(stvd, dvd->vdev_child[i]); 1984 } 1985 1986 if (!dvd->vdev_ops->vdev_op_leaf || !vdev_is_concrete(dvd)) 1987 return; 1988 1989 /* 1990 * The idea here is that while a vdev can shift positions within 1991 * a top vdev (when replacing, attaching mirror, etc.) it cannot 1992 * step outside of it. 1993 */ 1994 vdev_t *vd = vdev_lookup_by_guid(stvd, dvd->vdev_guid); 1995 1996 if (vd == NULL || vd->vdev_ops != dvd->vdev_ops) 1997 return; 1998 1999 ASSERT(vd->vdev_ops->vdev_op_leaf); 2000 2001 vdev_copy_path_impl(vd, dvd); 2002 } 2003 2004 /* 2005 * Recursively copy vdev paths from one root vdev to another. Source and 2006 * destination vdev trees may differ in geometry. For each destination leaf 2007 * vdev, search a vdev with the same guid and top vdev id in the source. 2008 * Intended to copy paths from userland config into MOS config. 2009 */ 2010 void 2011 vdev_copy_path_relaxed(vdev_t *srvd, vdev_t *drvd) 2012 { 2013 uint64_t children = MIN(srvd->vdev_children, drvd->vdev_children); 2014 ASSERT(srvd->vdev_ops == &vdev_root_ops); 2015 ASSERT(drvd->vdev_ops == &vdev_root_ops); 2016 2017 for (uint64_t i = 0; i < children; i++) { 2018 vdev_copy_path_search(srvd->vdev_child[i], 2019 drvd->vdev_child[i]); 2020 } 2021 } 2022 2023 /* 2024 * Close a virtual device. 2025 */ 2026 void 2027 vdev_close(vdev_t *vd) 2028 { 2029 spa_t *spa = vd->vdev_spa; 2030 vdev_t *pvd = vd->vdev_parent; 2031 2032 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2033 2034 /* 2035 * If our parent is reopening, then we are as well, unless we are 2036 * going offline. 2037 */ 2038 if (pvd != NULL && pvd->vdev_reopening) 2039 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 2040 2041 vd->vdev_ops->vdev_op_close(vd); 2042 2043 vdev_cache_purge(vd); 2044 2045 /* 2046 * We record the previous state before we close it, so that if we are 2047 * doing a reopen(), we don't generate FMA ereports if we notice that 2048 * it's still faulted. 2049 */ 2050 vd->vdev_prevstate = vd->vdev_state; 2051 2052 if (vd->vdev_offline) 2053 vd->vdev_state = VDEV_STATE_OFFLINE; 2054 else 2055 vd->vdev_state = VDEV_STATE_CLOSED; 2056 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 2057 } 2058 2059 void 2060 vdev_hold(vdev_t *vd) 2061 { 2062 spa_t *spa = vd->vdev_spa; 2063 2064 ASSERT(spa_is_root(spa)); 2065 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 2066 return; 2067 2068 for (int c = 0; c < vd->vdev_children; c++) 2069 vdev_hold(vd->vdev_child[c]); 2070 2071 if (vd->vdev_ops->vdev_op_leaf) 2072 vd->vdev_ops->vdev_op_hold(vd); 2073 } 2074 2075 void 2076 vdev_rele(vdev_t *vd) 2077 { 2078 spa_t *spa = vd->vdev_spa; 2079 2080 ASSERT(spa_is_root(spa)); 2081 for (int c = 0; c < vd->vdev_children; c++) 2082 vdev_rele(vd->vdev_child[c]); 2083 2084 if (vd->vdev_ops->vdev_op_leaf) 2085 vd->vdev_ops->vdev_op_rele(vd); 2086 } 2087 2088 /* 2089 * Reopen all interior vdevs and any unopened leaves. We don't actually 2090 * reopen leaf vdevs which had previously been opened as they might deadlock 2091 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 2092 * If the leaf has never been opened then open it, as usual. 2093 */ 2094 void 2095 vdev_reopen(vdev_t *vd) 2096 { 2097 spa_t *spa = vd->vdev_spa; 2098 2099 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2100 2101 /* set the reopening flag unless we're taking the vdev offline */ 2102 vd->vdev_reopening = !vd->vdev_offline; 2103 vdev_close(vd); 2104 (void) vdev_open(vd); 2105 2106 /* 2107 * Call vdev_validate() here to make sure we have the same device. 2108 * Otherwise, a device with an invalid label could be successfully 2109 * opened in response to vdev_reopen(). 2110 */ 2111 if (vd->vdev_aux) { 2112 (void) vdev_validate_aux(vd); 2113 if (vdev_readable(vd) && vdev_writeable(vd) && 2114 vd->vdev_aux == &spa->spa_l2cache && 2115 !l2arc_vdev_present(vd)) 2116 l2arc_add_vdev(spa, vd); 2117 } else { 2118 (void) vdev_validate(vd); 2119 } 2120 2121 /* 2122 * Reassess parent vdev's health. 2123 */ 2124 vdev_propagate_state(vd); 2125 } 2126 2127 int 2128 vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 2129 { 2130 int error; 2131 2132 /* 2133 * Normally, partial opens (e.g. of a mirror) are allowed. 2134 * For a create, however, we want to fail the request if 2135 * there are any components we can't open. 2136 */ 2137 error = vdev_open(vd); 2138 2139 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 2140 vdev_close(vd); 2141 return (error ? error : ENXIO); 2142 } 2143 2144 /* 2145 * Recursively load DTLs and initialize all labels. 2146 */ 2147 if ((error = vdev_dtl_load(vd)) != 0 || 2148 (error = vdev_label_init(vd, txg, isreplacing ? 2149 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 2150 vdev_close(vd); 2151 return (error); 2152 } 2153 2154 return (0); 2155 } 2156 2157 void 2158 vdev_metaslab_set_size(vdev_t *vd) 2159 { 2160 uint64_t asize = vd->vdev_asize; 2161 uint64_t ms_count = asize >> zfs_vdev_default_ms_shift; 2162 uint64_t ms_shift; 2163 2164 /* 2165 * There are two dimensions to the metaslab sizing calculation: 2166 * the size of the metaslab and the count of metaslabs per vdev. 2167 * 2168 * The default values used below are a good balance between memory 2169 * usage (larger metaslab size means more memory needed for loaded 2170 * metaslabs; more metaslabs means more memory needed for the 2171 * metaslab_t structs), metaslab load time (larger metaslabs take 2172 * longer to load), and metaslab sync time (more metaslabs means 2173 * more time spent syncing all of them). 2174 * 2175 * In general, we aim for zfs_vdev_default_ms_count (200) metaslabs. 2176 * The range of the dimensions are as follows: 2177 * 2178 * 2^29 <= ms_size <= 2^34 2179 * 16 <= ms_count <= 131,072 2180 * 2181 * On the lower end of vdev sizes, we aim for metaslabs sizes of 2182 * at least 512MB (2^29) to minimize fragmentation effects when 2183 * testing with smaller devices. However, the count constraint 2184 * of at least 16 metaslabs will override this minimum size goal. 2185 * 2186 * On the upper end of vdev sizes, we aim for a maximum metaslab 2187 * size of 16GB. However, we will cap the total count to 2^17 2188 * metaslabs to keep our memory footprint in check and let the 2189 * metaslab size grow from there if that limit is hit. 2190 * 2191 * The net effect of applying above constrains is summarized below. 2192 * 2193 * vdev size metaslab count 2194 * --------------|----------------- 2195 * < 8GB ~16 2196 * 8GB - 100GB one per 512MB 2197 * 100GB - 3TB ~200 2198 * 3TB - 2PB one per 16GB 2199 * > 2PB ~131,072 2200 * -------------------------------- 2201 * 2202 * Finally, note that all of the above calculate the initial 2203 * number of metaslabs. Expanding a top-level vdev will result 2204 * in additional metaslabs being allocated making it possible 2205 * to exceed the zfs_vdev_ms_count_limit. 2206 */ 2207 2208 if (ms_count < zfs_vdev_min_ms_count) 2209 ms_shift = highbit64(asize / zfs_vdev_min_ms_count); 2210 else if (ms_count > zfs_vdev_default_ms_count) 2211 ms_shift = highbit64(asize / zfs_vdev_default_ms_count); 2212 else 2213 ms_shift = zfs_vdev_default_ms_shift; 2214 2215 if (ms_shift < SPA_MAXBLOCKSHIFT) { 2216 ms_shift = SPA_MAXBLOCKSHIFT; 2217 } else if (ms_shift > zfs_vdev_max_ms_shift) { 2218 ms_shift = zfs_vdev_max_ms_shift; 2219 /* cap the total count to constrain memory footprint */ 2220 if ((asize >> ms_shift) > zfs_vdev_ms_count_limit) 2221 ms_shift = highbit64(asize / zfs_vdev_ms_count_limit); 2222 } 2223 2224 vd->vdev_ms_shift = ms_shift; 2225 ASSERT3U(vd->vdev_ms_shift, >=, SPA_MAXBLOCKSHIFT); 2226 } 2227 2228 void 2229 vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 2230 { 2231 ASSERT(vd == vd->vdev_top); 2232 /* indirect vdevs don't have metaslabs or dtls */ 2233 ASSERT(vdev_is_concrete(vd) || flags == 0); 2234 ASSERT(ISP2(flags)); 2235 ASSERT(spa_writeable(vd->vdev_spa)); 2236 2237 if (flags & VDD_METASLAB) 2238 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 2239 2240 if (flags & VDD_DTL) 2241 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 2242 2243 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 2244 } 2245 2246 void 2247 vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 2248 { 2249 for (int c = 0; c < vd->vdev_children; c++) 2250 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 2251 2252 if (vd->vdev_ops->vdev_op_leaf) 2253 vdev_dirty(vd->vdev_top, flags, vd, txg); 2254 } 2255 2256 /* 2257 * DTLs. 2258 * 2259 * A vdev's DTL (dirty time log) is the set of transaction groups for which 2260 * the vdev has less than perfect replication. There are four kinds of DTL: 2261 * 2262 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 2263 * 2264 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 2265 * 2266 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 2267 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 2268 * txgs that was scrubbed. 2269 * 2270 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 2271 * persistent errors or just some device being offline. 2272 * Unlike the other three, the DTL_OUTAGE map is not generally 2273 * maintained; it's only computed when needed, typically to 2274 * determine whether a device can be detached. 2275 * 2276 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 2277 * either has the data or it doesn't. 2278 * 2279 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 2280 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 2281 * if any child is less than fully replicated, then so is its parent. 2282 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 2283 * comprising only those txgs which appear in 'maxfaults' or more children; 2284 * those are the txgs we don't have enough replication to read. For example, 2285 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 2286 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 2287 * two child DTL_MISSING maps. 2288 * 2289 * It should be clear from the above that to compute the DTLs and outage maps 2290 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 2291 * Therefore, that is all we keep on disk. When loading the pool, or after 2292 * a configuration change, we generate all other DTLs from first principles. 2293 */ 2294 void 2295 vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 2296 { 2297 range_tree_t *rt = vd->vdev_dtl[t]; 2298 2299 ASSERT(t < DTL_TYPES); 2300 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 2301 ASSERT(spa_writeable(vd->vdev_spa)); 2302 2303 mutex_enter(&vd->vdev_dtl_lock); 2304 if (!range_tree_contains(rt, txg, size)) 2305 range_tree_add(rt, txg, size); 2306 mutex_exit(&vd->vdev_dtl_lock); 2307 } 2308 2309 boolean_t 2310 vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 2311 { 2312 range_tree_t *rt = vd->vdev_dtl[t]; 2313 boolean_t dirty = B_FALSE; 2314 2315 ASSERT(t < DTL_TYPES); 2316 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 2317 2318 /* 2319 * While we are loading the pool, the DTLs have not been loaded yet. 2320 * Ignore the DTLs and try all devices. This avoids a recursive 2321 * mutex enter on the vdev_dtl_lock, and also makes us try hard 2322 * when loading the pool (relying on the checksum to ensure that 2323 * we get the right data -- note that we while loading, we are 2324 * only reading the MOS, which is always checksummed). 2325 */ 2326 if (vd->vdev_spa->spa_load_state != SPA_LOAD_NONE) 2327 return (B_FALSE); 2328 2329 mutex_enter(&vd->vdev_dtl_lock); 2330 if (!range_tree_is_empty(rt)) 2331 dirty = range_tree_contains(rt, txg, size); 2332 mutex_exit(&vd->vdev_dtl_lock); 2333 2334 return (dirty); 2335 } 2336 2337 boolean_t 2338 vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 2339 { 2340 range_tree_t *rt = vd->vdev_dtl[t]; 2341 boolean_t empty; 2342 2343 mutex_enter(&vd->vdev_dtl_lock); 2344 empty = range_tree_is_empty(rt); 2345 mutex_exit(&vd->vdev_dtl_lock); 2346 2347 return (empty); 2348 } 2349 2350 /* 2351 * Returns the lowest txg in the DTL range. 2352 */ 2353 static uint64_t 2354 vdev_dtl_min(vdev_t *vd) 2355 { 2356 range_seg_t *rs; 2357 2358 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 2359 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 2360 ASSERT0(vd->vdev_children); 2361 2362 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 2363 return (rs->rs_start - 1); 2364 } 2365 2366 /* 2367 * Returns the highest txg in the DTL. 2368 */ 2369 static uint64_t 2370 vdev_dtl_max(vdev_t *vd) 2371 { 2372 range_seg_t *rs; 2373 2374 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 2375 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 2376 ASSERT0(vd->vdev_children); 2377 2378 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 2379 return (rs->rs_end); 2380 } 2381 2382 /* 2383 * Determine if a resilvering vdev should remove any DTL entries from 2384 * its range. If the vdev was resilvering for the entire duration of the 2385 * scan then it should excise that range from its DTLs. Otherwise, this 2386 * vdev is considered partially resilvered and should leave its DTL 2387 * entries intact. The comment in vdev_dtl_reassess() describes how we 2388 * excise the DTLs. 2389 */ 2390 static boolean_t 2391 vdev_dtl_should_excise(vdev_t *vd) 2392 { 2393 spa_t *spa = vd->vdev_spa; 2394 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 2395 2396 ASSERT0(scn->scn_phys.scn_errors); 2397 ASSERT0(vd->vdev_children); 2398 2399 if (vd->vdev_state < VDEV_STATE_DEGRADED) 2400 return (B_FALSE); 2401 2402 if (vd->vdev_resilver_txg == 0 || 2403 range_tree_is_empty(vd->vdev_dtl[DTL_MISSING])) 2404 return (B_TRUE); 2405 2406 /* 2407 * When a resilver is initiated the scan will assign the scn_max_txg 2408 * value to the highest txg value that exists in all DTLs. If this 2409 * device's max DTL is not part of this scan (i.e. it is not in 2410 * the range (scn_min_txg, scn_max_txg] then it is not eligible 2411 * for excision. 2412 */ 2413 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 2414 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 2415 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 2416 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 2417 return (B_TRUE); 2418 } 2419 return (B_FALSE); 2420 } 2421 2422 /* 2423 * Reassess DTLs after a config change or scrub completion. 2424 */ 2425 void 2426 vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 2427 { 2428 spa_t *spa = vd->vdev_spa; 2429 avl_tree_t reftree; 2430 int minref; 2431 2432 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2433 2434 for (int c = 0; c < vd->vdev_children; c++) 2435 vdev_dtl_reassess(vd->vdev_child[c], txg, 2436 scrub_txg, scrub_done); 2437 2438 if (vd == spa->spa_root_vdev || !vdev_is_concrete(vd) || vd->vdev_aux) 2439 return; 2440 2441 if (vd->vdev_ops->vdev_op_leaf) { 2442 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 2443 2444 mutex_enter(&vd->vdev_dtl_lock); 2445 2446 /* 2447 * If we've completed a scan cleanly then determine 2448 * if this vdev should remove any DTLs. We only want to 2449 * excise regions on vdevs that were available during 2450 * the entire duration of this scan. 2451 */ 2452 if (scrub_txg != 0 && 2453 (spa->spa_scrub_started || 2454 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 2455 vdev_dtl_should_excise(vd)) { 2456 /* 2457 * We completed a scrub up to scrub_txg. If we 2458 * did it without rebooting, then the scrub dtl 2459 * will be valid, so excise the old region and 2460 * fold in the scrub dtl. Otherwise, leave the 2461 * dtl as-is if there was an error. 2462 * 2463 * There's little trick here: to excise the beginning 2464 * of the DTL_MISSING map, we put it into a reference 2465 * tree and then add a segment with refcnt -1 that 2466 * covers the range [0, scrub_txg). This means 2467 * that each txg in that range has refcnt -1 or 0. 2468 * We then add DTL_SCRUB with a refcnt of 2, so that 2469 * entries in the range [0, scrub_txg) will have a 2470 * positive refcnt -- either 1 or 2. We then convert 2471 * the reference tree into the new DTL_MISSING map. 2472 */ 2473 space_reftree_create(&reftree); 2474 space_reftree_add_map(&reftree, 2475 vd->vdev_dtl[DTL_MISSING], 1); 2476 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 2477 space_reftree_add_map(&reftree, 2478 vd->vdev_dtl[DTL_SCRUB], 2); 2479 space_reftree_generate_map(&reftree, 2480 vd->vdev_dtl[DTL_MISSING], 1); 2481 space_reftree_destroy(&reftree); 2482 } 2483 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 2484 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 2485 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 2486 if (scrub_done) 2487 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 2488 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 2489 if (!vdev_readable(vd)) 2490 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 2491 else 2492 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 2493 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 2494 2495 /* 2496 * If the vdev was resilvering and no longer has any 2497 * DTLs then reset its resilvering flag. 2498 */ 2499 if (vd->vdev_resilver_txg != 0 && 2500 range_tree_is_empty(vd->vdev_dtl[DTL_MISSING]) && 2501 range_tree_is_empty(vd->vdev_dtl[DTL_OUTAGE])) 2502 vd->vdev_resilver_txg = 0; 2503 2504 mutex_exit(&vd->vdev_dtl_lock); 2505 2506 if (txg != 0) 2507 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 2508 return; 2509 } 2510 2511 mutex_enter(&vd->vdev_dtl_lock); 2512 for (int t = 0; t < DTL_TYPES; t++) { 2513 /* account for child's outage in parent's missing map */ 2514 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 2515 if (t == DTL_SCRUB) 2516 continue; /* leaf vdevs only */ 2517 if (t == DTL_PARTIAL) 2518 minref = 1; /* i.e. non-zero */ 2519 else if (vd->vdev_nparity != 0) 2520 minref = vd->vdev_nparity + 1; /* RAID-Z */ 2521 else 2522 minref = vd->vdev_children; /* any kind of mirror */ 2523 space_reftree_create(&reftree); 2524 for (int c = 0; c < vd->vdev_children; c++) { 2525 vdev_t *cvd = vd->vdev_child[c]; 2526 mutex_enter(&cvd->vdev_dtl_lock); 2527 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 2528 mutex_exit(&cvd->vdev_dtl_lock); 2529 } 2530 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2531 space_reftree_destroy(&reftree); 2532 } 2533 mutex_exit(&vd->vdev_dtl_lock); 2534 } 2535 2536 int 2537 vdev_dtl_load(vdev_t *vd) 2538 { 2539 spa_t *spa = vd->vdev_spa; 2540 objset_t *mos = spa->spa_meta_objset; 2541 int error = 0; 2542 2543 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2544 ASSERT(vdev_is_concrete(vd)); 2545 2546 error = space_map_open(&vd->vdev_dtl_sm, mos, 2547 vd->vdev_dtl_object, 0, -1ULL, 0); 2548 if (error) 2549 return (error); 2550 ASSERT(vd->vdev_dtl_sm != NULL); 2551 2552 mutex_enter(&vd->vdev_dtl_lock); 2553 error = space_map_load(vd->vdev_dtl_sm, 2554 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2555 mutex_exit(&vd->vdev_dtl_lock); 2556 2557 return (error); 2558 } 2559 2560 for (int c = 0; c < vd->vdev_children; c++) { 2561 error = vdev_dtl_load(vd->vdev_child[c]); 2562 if (error != 0) 2563 break; 2564 } 2565 2566 return (error); 2567 } 2568 2569 static void 2570 vdev_zap_allocation_data(vdev_t *vd, dmu_tx_t *tx) 2571 { 2572 spa_t *spa = vd->vdev_spa; 2573 objset_t *mos = spa->spa_meta_objset; 2574 vdev_alloc_bias_t alloc_bias = vd->vdev_alloc_bias; 2575 const char *string; 2576 2577 ASSERT(alloc_bias != VDEV_BIAS_NONE); 2578 2579 string = 2580 (alloc_bias == VDEV_BIAS_LOG) ? VDEV_ALLOC_BIAS_LOG : 2581 (alloc_bias == VDEV_BIAS_SPECIAL) ? VDEV_ALLOC_BIAS_SPECIAL : 2582 (alloc_bias == VDEV_BIAS_DEDUP) ? VDEV_ALLOC_BIAS_DEDUP : NULL; 2583 2584 ASSERT(string != NULL); 2585 VERIFY0(zap_add(mos, vd->vdev_top_zap, VDEV_TOP_ZAP_ALLOCATION_BIAS, 2586 1, strlen(string) + 1, string, tx)); 2587 2588 if (alloc_bias == VDEV_BIAS_SPECIAL || alloc_bias == VDEV_BIAS_DEDUP) { 2589 spa_activate_allocation_classes(spa, tx); 2590 } 2591 } 2592 2593 void 2594 vdev_destroy_unlink_zap(vdev_t *vd, uint64_t zapobj, dmu_tx_t *tx) 2595 { 2596 spa_t *spa = vd->vdev_spa; 2597 2598 VERIFY0(zap_destroy(spa->spa_meta_objset, zapobj, tx)); 2599 VERIFY0(zap_remove_int(spa->spa_meta_objset, spa->spa_all_vdev_zaps, 2600 zapobj, tx)); 2601 } 2602 2603 uint64_t 2604 vdev_create_link_zap(vdev_t *vd, dmu_tx_t *tx) 2605 { 2606 spa_t *spa = vd->vdev_spa; 2607 uint64_t zap = zap_create(spa->spa_meta_objset, DMU_OTN_ZAP_METADATA, 2608 DMU_OT_NONE, 0, tx); 2609 2610 ASSERT(zap != 0); 2611 VERIFY0(zap_add_int(spa->spa_meta_objset, spa->spa_all_vdev_zaps, 2612 zap, tx)); 2613 2614 return (zap); 2615 } 2616 2617 void 2618 vdev_construct_zaps(vdev_t *vd, dmu_tx_t *tx) 2619 { 2620 if (vd->vdev_ops != &vdev_hole_ops && 2621 vd->vdev_ops != &vdev_missing_ops && 2622 vd->vdev_ops != &vdev_root_ops && 2623 !vd->vdev_top->vdev_removing) { 2624 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_leaf_zap == 0) { 2625 vd->vdev_leaf_zap = vdev_create_link_zap(vd, tx); 2626 } 2627 if (vd == vd->vdev_top && vd->vdev_top_zap == 0) { 2628 vd->vdev_top_zap = vdev_create_link_zap(vd, tx); 2629 if (vd->vdev_alloc_bias != VDEV_BIAS_NONE) 2630 vdev_zap_allocation_data(vd, tx); 2631 } 2632 } 2633 2634 for (uint64_t i = 0; i < vd->vdev_children; i++) { 2635 vdev_construct_zaps(vd->vdev_child[i], tx); 2636 } 2637 } 2638 2639 void 2640 vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2641 { 2642 spa_t *spa = vd->vdev_spa; 2643 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2644 objset_t *mos = spa->spa_meta_objset; 2645 range_tree_t *rtsync; 2646 dmu_tx_t *tx; 2647 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2648 2649 ASSERT(vdev_is_concrete(vd)); 2650 ASSERT(vd->vdev_ops->vdev_op_leaf); 2651 2652 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2653 2654 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2655 mutex_enter(&vd->vdev_dtl_lock); 2656 space_map_free(vd->vdev_dtl_sm, tx); 2657 space_map_close(vd->vdev_dtl_sm); 2658 vd->vdev_dtl_sm = NULL; 2659 mutex_exit(&vd->vdev_dtl_lock); 2660 2661 /* 2662 * We only destroy the leaf ZAP for detached leaves or for 2663 * removed log devices. Removed data devices handle leaf ZAP 2664 * cleanup later, once cancellation is no longer possible. 2665 */ 2666 if (vd->vdev_leaf_zap != 0 && (vd->vdev_detached || 2667 vd->vdev_top->vdev_islog)) { 2668 vdev_destroy_unlink_zap(vd, vd->vdev_leaf_zap, tx); 2669 vd->vdev_leaf_zap = 0; 2670 } 2671 2672 dmu_tx_commit(tx); 2673 return; 2674 } 2675 2676 if (vd->vdev_dtl_sm == NULL) { 2677 uint64_t new_object; 2678 2679 new_object = space_map_alloc(mos, vdev_dtl_sm_blksz, tx); 2680 VERIFY3U(new_object, !=, 0); 2681 2682 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2683 0, -1ULL, 0)); 2684 ASSERT(vd->vdev_dtl_sm != NULL); 2685 } 2686 2687 rtsync = range_tree_create(NULL, NULL); 2688 2689 mutex_enter(&vd->vdev_dtl_lock); 2690 range_tree_walk(rt, range_tree_add, rtsync); 2691 mutex_exit(&vd->vdev_dtl_lock); 2692 2693 space_map_truncate(vd->vdev_dtl_sm, vdev_dtl_sm_blksz, tx); 2694 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, SM_NO_VDEVID, tx); 2695 range_tree_vacate(rtsync, NULL, NULL); 2696 2697 range_tree_destroy(rtsync); 2698 2699 /* 2700 * If the object for the space map has changed then dirty 2701 * the top level so that we update the config. 2702 */ 2703 if (object != space_map_object(vd->vdev_dtl_sm)) { 2704 vdev_dbgmsg(vd, "txg %llu, spa %s, DTL old object %llu, " 2705 "new object %llu", (u_longlong_t)txg, spa_name(spa), 2706 (u_longlong_t)object, 2707 (u_longlong_t)space_map_object(vd->vdev_dtl_sm)); 2708 vdev_config_dirty(vd->vdev_top); 2709 } 2710 2711 dmu_tx_commit(tx); 2712 } 2713 2714 /* 2715 * Determine whether the specified vdev can be offlined/detached/removed 2716 * without losing data. 2717 */ 2718 boolean_t 2719 vdev_dtl_required(vdev_t *vd) 2720 { 2721 spa_t *spa = vd->vdev_spa; 2722 vdev_t *tvd = vd->vdev_top; 2723 uint8_t cant_read = vd->vdev_cant_read; 2724 boolean_t required; 2725 2726 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2727 2728 if (vd == spa->spa_root_vdev || vd == tvd) 2729 return (B_TRUE); 2730 2731 /* 2732 * Temporarily mark the device as unreadable, and then determine 2733 * whether this results in any DTL outages in the top-level vdev. 2734 * If not, we can safely offline/detach/remove the device. 2735 */ 2736 vd->vdev_cant_read = B_TRUE; 2737 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2738 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2739 vd->vdev_cant_read = cant_read; 2740 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2741 2742 if (!required && zio_injection_enabled) 2743 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2744 2745 return (required); 2746 } 2747 2748 /* 2749 * Determine if resilver is needed, and if so the txg range. 2750 */ 2751 boolean_t 2752 vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2753 { 2754 boolean_t needed = B_FALSE; 2755 uint64_t thismin = UINT64_MAX; 2756 uint64_t thismax = 0; 2757 2758 if (vd->vdev_children == 0) { 2759 mutex_enter(&vd->vdev_dtl_lock); 2760 if (!range_tree_is_empty(vd->vdev_dtl[DTL_MISSING]) && 2761 vdev_writeable(vd)) { 2762 2763 thismin = vdev_dtl_min(vd); 2764 thismax = vdev_dtl_max(vd); 2765 needed = B_TRUE; 2766 } 2767 mutex_exit(&vd->vdev_dtl_lock); 2768 } else { 2769 for (int c = 0; c < vd->vdev_children; c++) { 2770 vdev_t *cvd = vd->vdev_child[c]; 2771 uint64_t cmin, cmax; 2772 2773 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2774 thismin = MIN(thismin, cmin); 2775 thismax = MAX(thismax, cmax); 2776 needed = B_TRUE; 2777 } 2778 } 2779 } 2780 2781 if (needed && minp) { 2782 *minp = thismin; 2783 *maxp = thismax; 2784 } 2785 return (needed); 2786 } 2787 2788 /* 2789 * Gets the checkpoint space map object from the vdev's ZAP. 2790 * Returns the spacemap object, or 0 if it wasn't in the ZAP 2791 * or the ZAP doesn't exist yet. 2792 */ 2793 int 2794 vdev_checkpoint_sm_object(vdev_t *vd) 2795 { 2796 ASSERT0(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER)); 2797 if (vd->vdev_top_zap == 0) { 2798 return (0); 2799 } 2800 2801 uint64_t sm_obj = 0; 2802 int err = zap_lookup(spa_meta_objset(vd->vdev_spa), vd->vdev_top_zap, 2803 VDEV_TOP_ZAP_POOL_CHECKPOINT_SM, sizeof (uint64_t), 1, &sm_obj); 2804 2805 ASSERT(err == 0 || err == ENOENT); 2806 2807 return (sm_obj); 2808 } 2809 2810 int 2811 vdev_load(vdev_t *vd) 2812 { 2813 int error = 0; 2814 /* 2815 * Recursively load all children. 2816 */ 2817 for (int c = 0; c < vd->vdev_children; c++) { 2818 error = vdev_load(vd->vdev_child[c]); 2819 if (error != 0) { 2820 return (error); 2821 } 2822 } 2823 2824 vdev_set_deflate_ratio(vd); 2825 2826 /* 2827 * On spa_load path, grab the allocation bias from our zap 2828 */ 2829 if (vd == vd->vdev_top && vd->vdev_top_zap != 0) { 2830 spa_t *spa = vd->vdev_spa; 2831 char bias_str[64]; 2832 2833 if (zap_lookup(spa->spa_meta_objset, vd->vdev_top_zap, 2834 VDEV_TOP_ZAP_ALLOCATION_BIAS, 1, sizeof (bias_str), 2835 bias_str) == 0) { 2836 ASSERT(vd->vdev_alloc_bias == VDEV_BIAS_NONE); 2837 vd->vdev_alloc_bias = vdev_derive_alloc_bias(bias_str); 2838 } 2839 } 2840 2841 /* 2842 * If this is a top-level vdev, initialize its metaslabs. 2843 */ 2844 if (vd == vd->vdev_top && vdev_is_concrete(vd)) { 2845 vdev_metaslab_group_create(vd); 2846 2847 if (vd->vdev_ashift == 0 || vd->vdev_asize == 0) { 2848 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2849 VDEV_AUX_CORRUPT_DATA); 2850 vdev_dbgmsg(vd, "vdev_load: invalid size. ashift=%llu, " 2851 "asize=%llu", (u_longlong_t)vd->vdev_ashift, 2852 (u_longlong_t)vd->vdev_asize); 2853 return (SET_ERROR(ENXIO)); 2854 } 2855 2856 error = vdev_metaslab_init(vd, 0); 2857 if (error != 0) { 2858 vdev_dbgmsg(vd, "vdev_load: metaslab_init failed " 2859 "[error=%d]", error); 2860 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2861 VDEV_AUX_CORRUPT_DATA); 2862 return (error); 2863 } 2864 2865 uint64_t checkpoint_sm_obj = vdev_checkpoint_sm_object(vd); 2866 if (checkpoint_sm_obj != 0) { 2867 objset_t *mos = spa_meta_objset(vd->vdev_spa); 2868 ASSERT(vd->vdev_asize != 0); 2869 ASSERT3P(vd->vdev_checkpoint_sm, ==, NULL); 2870 2871 error = space_map_open(&vd->vdev_checkpoint_sm, 2872 mos, checkpoint_sm_obj, 0, vd->vdev_asize, 2873 vd->vdev_ashift); 2874 if (error != 0) { 2875 vdev_dbgmsg(vd, "vdev_load: space_map_open " 2876 "failed for checkpoint spacemap (obj %llu) " 2877 "[error=%d]", 2878 (u_longlong_t)checkpoint_sm_obj, error); 2879 return (error); 2880 } 2881 ASSERT3P(vd->vdev_checkpoint_sm, !=, NULL); 2882 2883 /* 2884 * Since the checkpoint_sm contains free entries 2885 * exclusively we can use space_map_allocated() to 2886 * indicate the cumulative checkpointed space that 2887 * has been freed. 2888 */ 2889 vd->vdev_stat.vs_checkpoint_space = 2890 -space_map_allocated(vd->vdev_checkpoint_sm); 2891 vd->vdev_spa->spa_checkpoint_info.sci_dspace += 2892 vd->vdev_stat.vs_checkpoint_space; 2893 } 2894 } 2895 2896 /* 2897 * If this is a leaf vdev, load its DTL. 2898 */ 2899 if (vd->vdev_ops->vdev_op_leaf && (error = vdev_dtl_load(vd)) != 0) { 2900 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2901 VDEV_AUX_CORRUPT_DATA); 2902 vdev_dbgmsg(vd, "vdev_load: vdev_dtl_load failed " 2903 "[error=%d]", error); 2904 return (error); 2905 } 2906 2907 uint64_t obsolete_sm_object = vdev_obsolete_sm_object(vd); 2908 if (obsolete_sm_object != 0) { 2909 objset_t *mos = vd->vdev_spa->spa_meta_objset; 2910 ASSERT(vd->vdev_asize != 0); 2911 ASSERT3P(vd->vdev_obsolete_sm, ==, NULL); 2912 2913 if ((error = space_map_open(&vd->vdev_obsolete_sm, mos, 2914 obsolete_sm_object, 0, vd->vdev_asize, 0))) { 2915 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2916 VDEV_AUX_CORRUPT_DATA); 2917 vdev_dbgmsg(vd, "vdev_load: space_map_open failed for " 2918 "obsolete spacemap (obj %llu) [error=%d]", 2919 (u_longlong_t)obsolete_sm_object, error); 2920 return (error); 2921 } 2922 } 2923 2924 return (0); 2925 } 2926 2927 /* 2928 * The special vdev case is used for hot spares and l2cache devices. Its 2929 * sole purpose it to set the vdev state for the associated vdev. To do this, 2930 * we make sure that we can open the underlying device, then try to read the 2931 * label, and make sure that the label is sane and that it hasn't been 2932 * repurposed to another pool. 2933 */ 2934 int 2935 vdev_validate_aux(vdev_t *vd) 2936 { 2937 nvlist_t *label; 2938 uint64_t guid, version; 2939 uint64_t state; 2940 2941 if (!vdev_readable(vd)) 2942 return (0); 2943 2944 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2945 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2946 VDEV_AUX_CORRUPT_DATA); 2947 return (-1); 2948 } 2949 2950 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2951 !SPA_VERSION_IS_SUPPORTED(version) || 2952 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2953 guid != vd->vdev_guid || 2954 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2955 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2956 VDEV_AUX_CORRUPT_DATA); 2957 nvlist_free(label); 2958 return (-1); 2959 } 2960 2961 /* 2962 * We don't actually check the pool state here. If it's in fact in 2963 * use by another pool, we update this fact on the fly when requested. 2964 */ 2965 nvlist_free(label); 2966 return (0); 2967 } 2968 2969 /* 2970 * Free the objects used to store this vdev's spacemaps, and the array 2971 * that points to them. 2972 */ 2973 void 2974 vdev_destroy_spacemaps(vdev_t *vd, dmu_tx_t *tx) 2975 { 2976 if (vd->vdev_ms_array == 0) 2977 return; 2978 2979 objset_t *mos = vd->vdev_spa->spa_meta_objset; 2980 uint64_t array_count = vd->vdev_asize >> vd->vdev_ms_shift; 2981 size_t array_bytes = array_count * sizeof (uint64_t); 2982 uint64_t *smobj_array = kmem_alloc(array_bytes, KM_SLEEP); 2983 VERIFY0(dmu_read(mos, vd->vdev_ms_array, 0, 2984 array_bytes, smobj_array, 0)); 2985 2986 for (uint64_t i = 0; i < array_count; i++) { 2987 uint64_t smobj = smobj_array[i]; 2988 if (smobj == 0) 2989 continue; 2990 2991 space_map_free_obj(mos, smobj, tx); 2992 } 2993 2994 kmem_free(smobj_array, array_bytes); 2995 VERIFY0(dmu_object_free(mos, vd->vdev_ms_array, tx)); 2996 vd->vdev_ms_array = 0; 2997 } 2998 2999 static void 3000 vdev_remove_empty_log(vdev_t *vd, uint64_t txg) 3001 { 3002 spa_t *spa = vd->vdev_spa; 3003 3004 ASSERT(vd->vdev_islog); 3005 ASSERT(vd == vd->vdev_top); 3006 ASSERT3U(txg, ==, spa_syncing_txg(spa)); 3007 3008 dmu_tx_t *tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 3009 3010 vdev_destroy_spacemaps(vd, tx); 3011 if (vd->vdev_top_zap != 0) { 3012 vdev_destroy_unlink_zap(vd, vd->vdev_top_zap, tx); 3013 vd->vdev_top_zap = 0; 3014 } 3015 3016 dmu_tx_commit(tx); 3017 } 3018 3019 void 3020 vdev_sync_done(vdev_t *vd, uint64_t txg) 3021 { 3022 metaslab_t *msp; 3023 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 3024 3025 ASSERT(vdev_is_concrete(vd)); 3026 3027 while ((msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 3028 != NULL) 3029 metaslab_sync_done(msp, txg); 3030 3031 if (reassess) 3032 metaslab_sync_reassess(vd->vdev_mg); 3033 } 3034 3035 void 3036 vdev_sync(vdev_t *vd, uint64_t txg) 3037 { 3038 spa_t *spa = vd->vdev_spa; 3039 vdev_t *lvd; 3040 metaslab_t *msp; 3041 3042 ASSERT3U(txg, ==, spa->spa_syncing_txg); 3043 dmu_tx_t *tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 3044 if (range_tree_space(vd->vdev_obsolete_segments) > 0) { 3045 ASSERT(vd->vdev_removing || 3046 vd->vdev_ops == &vdev_indirect_ops); 3047 3048 vdev_indirect_sync_obsolete(vd, tx); 3049 3050 /* 3051 * If the vdev is indirect, it can't have dirty 3052 * metaslabs or DTLs. 3053 */ 3054 if (vd->vdev_ops == &vdev_indirect_ops) { 3055 ASSERT(txg_list_empty(&vd->vdev_ms_list, txg)); 3056 ASSERT(txg_list_empty(&vd->vdev_dtl_list, txg)); 3057 dmu_tx_commit(tx); 3058 return; 3059 } 3060 } 3061 3062 ASSERT(vdev_is_concrete(vd)); 3063 3064 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0 && 3065 !vd->vdev_removing) { 3066 ASSERT(vd == vd->vdev_top); 3067 ASSERT0(vd->vdev_indirect_config.vic_mapping_object); 3068 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 3069 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 3070 ASSERT(vd->vdev_ms_array != 0); 3071 vdev_config_dirty(vd); 3072 } 3073 3074 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 3075 metaslab_sync(msp, txg); 3076 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 3077 } 3078 3079 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 3080 vdev_dtl_sync(lvd, txg); 3081 3082 /* 3083 * If this is an empty log device being removed, destroy the 3084 * metadata associated with it. 3085 */ 3086 if (vd->vdev_islog && vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 3087 vdev_remove_empty_log(vd, txg); 3088 3089 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 3090 dmu_tx_commit(tx); 3091 } 3092 3093 uint64_t 3094 vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 3095 { 3096 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 3097 } 3098 3099 /* 3100 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 3101 * not be opened, and no I/O is attempted. 3102 */ 3103 int 3104 vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 3105 { 3106 vdev_t *vd, *tvd; 3107 3108 spa_vdev_state_enter(spa, SCL_NONE); 3109 3110 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3111 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3112 3113 if (!vd->vdev_ops->vdev_op_leaf) 3114 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3115 3116 tvd = vd->vdev_top; 3117 3118 /* 3119 * We don't directly use the aux state here, but if we do a 3120 * vdev_reopen(), we need this value to be present to remember why we 3121 * were faulted. 3122 */ 3123 vd->vdev_label_aux = aux; 3124 3125 /* 3126 * Faulted state takes precedence over degraded. 3127 */ 3128 vd->vdev_delayed_close = B_FALSE; 3129 vd->vdev_faulted = 1ULL; 3130 vd->vdev_degraded = 0ULL; 3131 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 3132 3133 /* 3134 * If this device has the only valid copy of the data, then 3135 * back off and simply mark the vdev as degraded instead. 3136 */ 3137 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 3138 vd->vdev_degraded = 1ULL; 3139 vd->vdev_faulted = 0ULL; 3140 3141 /* 3142 * If we reopen the device and it's not dead, only then do we 3143 * mark it degraded. 3144 */ 3145 vdev_reopen(tvd); 3146 3147 if (vdev_readable(vd)) 3148 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 3149 } 3150 3151 return (spa_vdev_state_exit(spa, vd, 0)); 3152 } 3153 3154 /* 3155 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 3156 * user that something is wrong. The vdev continues to operate as normal as far 3157 * as I/O is concerned. 3158 */ 3159 int 3160 vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 3161 { 3162 vdev_t *vd; 3163 3164 spa_vdev_state_enter(spa, SCL_NONE); 3165 3166 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3167 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3168 3169 if (!vd->vdev_ops->vdev_op_leaf) 3170 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3171 3172 /* 3173 * If the vdev is already faulted, then don't do anything. 3174 */ 3175 if (vd->vdev_faulted || vd->vdev_degraded) 3176 return (spa_vdev_state_exit(spa, NULL, 0)); 3177 3178 vd->vdev_degraded = 1ULL; 3179 if (!vdev_is_dead(vd)) 3180 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 3181 aux); 3182 3183 return (spa_vdev_state_exit(spa, vd, 0)); 3184 } 3185 3186 /* 3187 * Online the given vdev. 3188 * 3189 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 3190 * spare device should be detached when the device finishes resilvering. 3191 * Second, the online should be treated like a 'test' online case, so no FMA 3192 * events are generated if the device fails to open. 3193 */ 3194 int 3195 vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 3196 { 3197 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 3198 boolean_t wasoffline; 3199 vdev_state_t oldstate; 3200 3201 spa_vdev_state_enter(spa, SCL_NONE); 3202 3203 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3204 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3205 3206 if (!vd->vdev_ops->vdev_op_leaf) 3207 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3208 3209 wasoffline = (vd->vdev_offline || vd->vdev_tmpoffline); 3210 oldstate = vd->vdev_state; 3211 3212 tvd = vd->vdev_top; 3213 vd->vdev_offline = B_FALSE; 3214 vd->vdev_tmpoffline = B_FALSE; 3215 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 3216 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 3217 3218 /* XXX - L2ARC 1.0 does not support expansion */ 3219 if (!vd->vdev_aux) { 3220 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3221 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 3222 } 3223 3224 vdev_reopen(tvd); 3225 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 3226 3227 if (!vd->vdev_aux) { 3228 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3229 pvd->vdev_expanding = B_FALSE; 3230 } 3231 3232 if (newstate) 3233 *newstate = vd->vdev_state; 3234 if ((flags & ZFS_ONLINE_UNSPARE) && 3235 !vdev_is_dead(vd) && vd->vdev_parent && 3236 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 3237 vd->vdev_parent->vdev_child[0] == vd) 3238 vd->vdev_unspare = B_TRUE; 3239 3240 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 3241 3242 /* XXX - L2ARC 1.0 does not support expansion */ 3243 if (vd->vdev_aux) 3244 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 3245 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 3246 } 3247 3248 /* Restart initializing if necessary */ 3249 mutex_enter(&vd->vdev_initialize_lock); 3250 if (vdev_writeable(vd) && 3251 vd->vdev_initialize_thread == NULL && 3252 vd->vdev_initialize_state == VDEV_INITIALIZE_ACTIVE) { 3253 (void) vdev_initialize(vd); 3254 } 3255 mutex_exit(&vd->vdev_initialize_lock); 3256 3257 if (wasoffline || 3258 (oldstate < VDEV_STATE_DEGRADED && 3259 vd->vdev_state >= VDEV_STATE_DEGRADED)) 3260 spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_ONLINE); 3261 3262 return (spa_vdev_state_exit(spa, vd, 0)); 3263 } 3264 3265 static int 3266 vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 3267 { 3268 vdev_t *vd, *tvd; 3269 int error = 0; 3270 uint64_t generation; 3271 metaslab_group_t *mg; 3272 3273 top: 3274 spa_vdev_state_enter(spa, SCL_ALLOC); 3275 3276 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3277 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3278 3279 if (!vd->vdev_ops->vdev_op_leaf) 3280 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3281 3282 tvd = vd->vdev_top; 3283 mg = tvd->vdev_mg; 3284 generation = spa->spa_config_generation + 1; 3285 3286 /* 3287 * If the device isn't already offline, try to offline it. 3288 */ 3289 if (!vd->vdev_offline) { 3290 /* 3291 * If this device has the only valid copy of some data, 3292 * don't allow it to be offlined. Log devices are always 3293 * expendable. 3294 */ 3295 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 3296 vdev_dtl_required(vd)) 3297 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 3298 3299 /* 3300 * If the top-level is a slog and it has had allocations 3301 * then proceed. We check that the vdev's metaslab group 3302 * is not NULL since it's possible that we may have just 3303 * added this vdev but not yet initialized its metaslabs. 3304 */ 3305 if (tvd->vdev_islog && mg != NULL) { 3306 /* 3307 * Prevent any future allocations. 3308 */ 3309 metaslab_group_passivate(mg); 3310 (void) spa_vdev_state_exit(spa, vd, 0); 3311 3312 error = spa_reset_logs(spa); 3313 3314 /* 3315 * If the log device was successfully reset but has 3316 * checkpointed data, do not offline it. 3317 */ 3318 if (error == 0 && 3319 tvd->vdev_checkpoint_sm != NULL) { 3320 error = ZFS_ERR_CHECKPOINT_EXISTS; 3321 } 3322 3323 spa_vdev_state_enter(spa, SCL_ALLOC); 3324 3325 /* 3326 * Check to see if the config has changed. 3327 */ 3328 if (error || generation != spa->spa_config_generation) { 3329 metaslab_group_activate(mg); 3330 if (error) 3331 return (spa_vdev_state_exit(spa, 3332 vd, error)); 3333 (void) spa_vdev_state_exit(spa, vd, 0); 3334 goto top; 3335 } 3336 ASSERT0(tvd->vdev_stat.vs_alloc); 3337 } 3338 3339 /* 3340 * Offline this device and reopen its top-level vdev. 3341 * If the top-level vdev is a log device then just offline 3342 * it. Otherwise, if this action results in the top-level 3343 * vdev becoming unusable, undo it and fail the request. 3344 */ 3345 vd->vdev_offline = B_TRUE; 3346 vdev_reopen(tvd); 3347 3348 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 3349 vdev_is_dead(tvd)) { 3350 vd->vdev_offline = B_FALSE; 3351 vdev_reopen(tvd); 3352 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 3353 } 3354 3355 /* 3356 * Add the device back into the metaslab rotor so that 3357 * once we online the device it's open for business. 3358 */ 3359 if (tvd->vdev_islog && mg != NULL) 3360 metaslab_group_activate(mg); 3361 } 3362 3363 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 3364 3365 return (spa_vdev_state_exit(spa, vd, 0)); 3366 } 3367 3368 int 3369 vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 3370 { 3371 int error; 3372 3373 mutex_enter(&spa->spa_vdev_top_lock); 3374 error = vdev_offline_locked(spa, guid, flags); 3375 mutex_exit(&spa->spa_vdev_top_lock); 3376 3377 return (error); 3378 } 3379 3380 /* 3381 * Clear the error counts associated with this vdev. Unlike vdev_online() and 3382 * vdev_offline(), we assume the spa config is locked. We also clear all 3383 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 3384 */ 3385 void 3386 vdev_clear(spa_t *spa, vdev_t *vd) 3387 { 3388 vdev_t *rvd = spa->spa_root_vdev; 3389 3390 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3391 3392 if (vd == NULL) 3393 vd = rvd; 3394 3395 vd->vdev_stat.vs_read_errors = 0; 3396 vd->vdev_stat.vs_write_errors = 0; 3397 vd->vdev_stat.vs_checksum_errors = 0; 3398 3399 for (int c = 0; c < vd->vdev_children; c++) 3400 vdev_clear(spa, vd->vdev_child[c]); 3401 3402 /* 3403 * It makes no sense to "clear" an indirect vdev. 3404 */ 3405 if (!vdev_is_concrete(vd)) 3406 return; 3407 3408 /* 3409 * If we're in the FAULTED state or have experienced failed I/O, then 3410 * clear the persistent state and attempt to reopen the device. We 3411 * also mark the vdev config dirty, so that the new faulted state is 3412 * written out to disk. 3413 */ 3414 if (vd->vdev_faulted || vd->vdev_degraded || 3415 !vdev_readable(vd) || !vdev_writeable(vd)) { 3416 3417 /* 3418 * When reopening in reponse to a clear event, it may be due to 3419 * a fmadm repair request. In this case, if the device is 3420 * still broken, we want to still post the ereport again. 3421 */ 3422 vd->vdev_forcefault = B_TRUE; 3423 3424 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 3425 vd->vdev_cant_read = B_FALSE; 3426 vd->vdev_cant_write = B_FALSE; 3427 3428 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 3429 3430 vd->vdev_forcefault = B_FALSE; 3431 3432 if (vd != rvd && vdev_writeable(vd->vdev_top)) 3433 vdev_state_dirty(vd->vdev_top); 3434 3435 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 3436 spa_async_request(spa, SPA_ASYNC_RESILVER); 3437 3438 spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_CLEAR); 3439 } 3440 3441 /* 3442 * When clearing a FMA-diagnosed fault, we always want to 3443 * unspare the device, as we assume that the original spare was 3444 * done in response to the FMA fault. 3445 */ 3446 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 3447 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 3448 vd->vdev_parent->vdev_child[0] == vd) 3449 vd->vdev_unspare = B_TRUE; 3450 } 3451 3452 boolean_t 3453 vdev_is_dead(vdev_t *vd) 3454 { 3455 /* 3456 * Holes and missing devices are always considered "dead". 3457 * This simplifies the code since we don't have to check for 3458 * these types of devices in the various code paths. 3459 * Instead we rely on the fact that we skip over dead devices 3460 * before issuing I/O to them. 3461 */ 3462 return (vd->vdev_state < VDEV_STATE_DEGRADED || 3463 vd->vdev_ops == &vdev_hole_ops || 3464 vd->vdev_ops == &vdev_missing_ops); 3465 } 3466 3467 boolean_t 3468 vdev_readable(vdev_t *vd) 3469 { 3470 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 3471 } 3472 3473 boolean_t 3474 vdev_writeable(vdev_t *vd) 3475 { 3476 return (!vdev_is_dead(vd) && !vd->vdev_cant_write && 3477 vdev_is_concrete(vd)); 3478 } 3479 3480 boolean_t 3481 vdev_allocatable(vdev_t *vd) 3482 { 3483 uint64_t state = vd->vdev_state; 3484 3485 /* 3486 * We currently allow allocations from vdevs which may be in the 3487 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 3488 * fails to reopen then we'll catch it later when we're holding 3489 * the proper locks. Note that we have to get the vdev state 3490 * in a local variable because although it changes atomically, 3491 * we're asking two separate questions about it. 3492 */ 3493 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 3494 !vd->vdev_cant_write && vdev_is_concrete(vd) && 3495 vd->vdev_mg->mg_initialized); 3496 } 3497 3498 boolean_t 3499 vdev_accessible(vdev_t *vd, zio_t *zio) 3500 { 3501 ASSERT(zio->io_vd == vd); 3502 3503 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 3504 return (B_FALSE); 3505 3506 if (zio->io_type == ZIO_TYPE_READ) 3507 return (!vd->vdev_cant_read); 3508 3509 if (zio->io_type == ZIO_TYPE_WRITE) 3510 return (!vd->vdev_cant_write); 3511 3512 return (B_TRUE); 3513 } 3514 3515 boolean_t 3516 vdev_is_spacemap_addressable(vdev_t *vd) 3517 { 3518 if (spa_feature_is_active(vd->vdev_spa, SPA_FEATURE_SPACEMAP_V2)) 3519 return (B_TRUE); 3520 3521 /* 3522 * If double-word space map entries are not enabled we assume 3523 * 47 bits of the space map entry are dedicated to the entry's 3524 * offset (see SM_OFFSET_BITS in space_map.h). We then use that 3525 * to calculate the maximum address that can be described by a 3526 * space map entry for the given device. 3527 */ 3528 uint64_t shift = vd->vdev_ashift + SM_OFFSET_BITS; 3529 3530 if (shift >= 63) /* detect potential overflow */ 3531 return (B_TRUE); 3532 3533 return (vd->vdev_asize < (1ULL << shift)); 3534 } 3535 3536 /* 3537 * Get statistics for the given vdev. 3538 */ 3539 void 3540 vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 3541 { 3542 spa_t *spa = vd->vdev_spa; 3543 vdev_t *rvd = spa->spa_root_vdev; 3544 vdev_t *tvd = vd->vdev_top; 3545 3546 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 3547 3548 mutex_enter(&vd->vdev_stat_lock); 3549 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 3550 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 3551 vs->vs_state = vd->vdev_state; 3552 vs->vs_rsize = vdev_get_min_asize(vd); 3553 if (vd->vdev_ops->vdev_op_leaf) { 3554 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 3555 /* 3556 * Report intializing progress. Since we don't have the 3557 * initializing locks held, this is only an estimate (although a 3558 * fairly accurate one). 3559 */ 3560 vs->vs_initialize_bytes_done = vd->vdev_initialize_bytes_done; 3561 vs->vs_initialize_bytes_est = vd->vdev_initialize_bytes_est; 3562 vs->vs_initialize_state = vd->vdev_initialize_state; 3563 vs->vs_initialize_action_time = vd->vdev_initialize_action_time; 3564 } 3565 /* 3566 * Report expandable space on top-level, non-auxillary devices only. 3567 * The expandable space is reported in terms of metaslab sized units 3568 * since that determines how much space the pool can expand. 3569 */ 3570 if (vd->vdev_aux == NULL && tvd != NULL) { 3571 vs->vs_esize = P2ALIGN(vd->vdev_max_asize - vd->vdev_asize - 3572 spa->spa_bootsize, 1ULL << tvd->vdev_ms_shift); 3573 } 3574 if (vd->vdev_aux == NULL && vd == vd->vdev_top && 3575 vdev_is_concrete(vd)) { 3576 vs->vs_fragmentation = (vd->vdev_mg != NULL) ? 3577 vd->vdev_mg->mg_fragmentation : 0; 3578 } 3579 3580 /* 3581 * If we're getting stats on the root vdev, aggregate the I/O counts 3582 * over all top-level vdevs (i.e. the direct children of the root). 3583 */ 3584 if (vd == rvd) { 3585 for (int c = 0; c < rvd->vdev_children; c++) { 3586 vdev_t *cvd = rvd->vdev_child[c]; 3587 vdev_stat_t *cvs = &cvd->vdev_stat; 3588 3589 for (int t = 0; t < ZIO_TYPES; t++) { 3590 vs->vs_ops[t] += cvs->vs_ops[t]; 3591 vs->vs_bytes[t] += cvs->vs_bytes[t]; 3592 } 3593 cvs->vs_scan_removing = cvd->vdev_removing; 3594 } 3595 } 3596 mutex_exit(&vd->vdev_stat_lock); 3597 } 3598 3599 void 3600 vdev_clear_stats(vdev_t *vd) 3601 { 3602 mutex_enter(&vd->vdev_stat_lock); 3603 vd->vdev_stat.vs_space = 0; 3604 vd->vdev_stat.vs_dspace = 0; 3605 vd->vdev_stat.vs_alloc = 0; 3606 mutex_exit(&vd->vdev_stat_lock); 3607 } 3608 3609 void 3610 vdev_scan_stat_init(vdev_t *vd) 3611 { 3612 vdev_stat_t *vs = &vd->vdev_stat; 3613 3614 for (int c = 0; c < vd->vdev_children; c++) 3615 vdev_scan_stat_init(vd->vdev_child[c]); 3616 3617 mutex_enter(&vd->vdev_stat_lock); 3618 vs->vs_scan_processed = 0; 3619 mutex_exit(&vd->vdev_stat_lock); 3620 } 3621 3622 void 3623 vdev_stat_update(zio_t *zio, uint64_t psize) 3624 { 3625 spa_t *spa = zio->io_spa; 3626 vdev_t *rvd = spa->spa_root_vdev; 3627 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 3628 vdev_t *pvd; 3629 uint64_t txg = zio->io_txg; 3630 vdev_stat_t *vs = &vd->vdev_stat; 3631 zio_type_t type = zio->io_type; 3632 int flags = zio->io_flags; 3633 3634 /* 3635 * If this i/o is a gang leader, it didn't do any actual work. 3636 */ 3637 if (zio->io_gang_tree) 3638 return; 3639 3640 if (zio->io_error == 0) { 3641 /* 3642 * If this is a root i/o, don't count it -- we've already 3643 * counted the top-level vdevs, and vdev_get_stats() will 3644 * aggregate them when asked. This reduces contention on 3645 * the root vdev_stat_lock and implicitly handles blocks 3646 * that compress away to holes, for which there is no i/o. 3647 * (Holes never create vdev children, so all the counters 3648 * remain zero, which is what we want.) 3649 * 3650 * Note: this only applies to successful i/o (io_error == 0) 3651 * because unlike i/o counts, errors are not additive. 3652 * When reading a ditto block, for example, failure of 3653 * one top-level vdev does not imply a root-level error. 3654 */ 3655 if (vd == rvd) 3656 return; 3657 3658 ASSERT(vd == zio->io_vd); 3659 3660 if (flags & ZIO_FLAG_IO_BYPASS) 3661 return; 3662 3663 mutex_enter(&vd->vdev_stat_lock); 3664 3665 if (flags & ZIO_FLAG_IO_REPAIR) { 3666 if (flags & ZIO_FLAG_SCAN_THREAD) { 3667 dsl_scan_phys_t *scn_phys = 3668 &spa->spa_dsl_pool->dp_scan->scn_phys; 3669 uint64_t *processed = &scn_phys->scn_processed; 3670 3671 /* XXX cleanup? */ 3672 if (vd->vdev_ops->vdev_op_leaf) 3673 atomic_add_64(processed, psize); 3674 vs->vs_scan_processed += psize; 3675 } 3676 3677 if (flags & ZIO_FLAG_SELF_HEAL) 3678 vs->vs_self_healed += psize; 3679 } 3680 3681 vs->vs_ops[type]++; 3682 vs->vs_bytes[type] += psize; 3683 3684 mutex_exit(&vd->vdev_stat_lock); 3685 return; 3686 } 3687 3688 if (flags & ZIO_FLAG_SPECULATIVE) 3689 return; 3690 3691 /* 3692 * If this is an I/O error that is going to be retried, then ignore the 3693 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 3694 * hard errors, when in reality they can happen for any number of 3695 * innocuous reasons (bus resets, MPxIO link failure, etc). 3696 */ 3697 if (zio->io_error == EIO && 3698 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 3699 return; 3700 3701 /* 3702 * Intent logs writes won't propagate their error to the root 3703 * I/O so don't mark these types of failures as pool-level 3704 * errors. 3705 */ 3706 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 3707 return; 3708 3709 mutex_enter(&vd->vdev_stat_lock); 3710 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 3711 if (zio->io_error == ECKSUM) 3712 vs->vs_checksum_errors++; 3713 else 3714 vs->vs_read_errors++; 3715 } 3716 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 3717 vs->vs_write_errors++; 3718 mutex_exit(&vd->vdev_stat_lock); 3719 3720 if (spa->spa_load_state == SPA_LOAD_NONE && 3721 type == ZIO_TYPE_WRITE && txg != 0 && 3722 (!(flags & ZIO_FLAG_IO_REPAIR) || 3723 (flags & ZIO_FLAG_SCAN_THREAD) || 3724 spa->spa_claiming)) { 3725 /* 3726 * This is either a normal write (not a repair), or it's 3727 * a repair induced by the scrub thread, or it's a repair 3728 * made by zil_claim() during spa_load() in the first txg. 3729 * In the normal case, we commit the DTL change in the same 3730 * txg as the block was born. In the scrub-induced repair 3731 * case, we know that scrubs run in first-pass syncing context, 3732 * so we commit the DTL change in spa_syncing_txg(spa). 3733 * In the zil_claim() case, we commit in spa_first_txg(spa). 3734 * 3735 * We currently do not make DTL entries for failed spontaneous 3736 * self-healing writes triggered by normal (non-scrubbing) 3737 * reads, because we have no transactional context in which to 3738 * do so -- and it's not clear that it'd be desirable anyway. 3739 */ 3740 if (vd->vdev_ops->vdev_op_leaf) { 3741 uint64_t commit_txg = txg; 3742 if (flags & ZIO_FLAG_SCAN_THREAD) { 3743 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 3744 ASSERT(spa_sync_pass(spa) == 1); 3745 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 3746 commit_txg = spa_syncing_txg(spa); 3747 } else if (spa->spa_claiming) { 3748 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 3749 commit_txg = spa_first_txg(spa); 3750 } 3751 ASSERT(commit_txg >= spa_syncing_txg(spa)); 3752 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 3753 return; 3754 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3755 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 3756 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 3757 } 3758 if (vd != rvd) 3759 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 3760 } 3761 } 3762 3763 int64_t 3764 vdev_deflated_space(vdev_t *vd, int64_t space) 3765 { 3766 ASSERT((space & (SPA_MINBLOCKSIZE-1)) == 0); 3767 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 3768 3769 return ((space >> SPA_MINBLOCKSHIFT) * vd->vdev_deflate_ratio); 3770 } 3771 3772 /* 3773 * Update the in-core space usage stats for this vdev and the root vdev. 3774 */ 3775 void 3776 vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 3777 int64_t space_delta) 3778 { 3779 int64_t dspace_delta; 3780 spa_t *spa = vd->vdev_spa; 3781 vdev_t *rvd = spa->spa_root_vdev; 3782 3783 ASSERT(vd == vd->vdev_top); 3784 3785 /* 3786 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 3787 * factor. We must calculate this here and not at the root vdev 3788 * because the root vdev's psize-to-asize is simply the max of its 3789 * childrens', thus not accurate enough for us. 3790 */ 3791 dspace_delta = vdev_deflated_space(vd, space_delta); 3792 3793 mutex_enter(&vd->vdev_stat_lock); 3794 vd->vdev_stat.vs_alloc += alloc_delta; 3795 vd->vdev_stat.vs_space += space_delta; 3796 vd->vdev_stat.vs_dspace += dspace_delta; 3797 mutex_exit(&vd->vdev_stat_lock); 3798 3799 /* every class but log contributes to root space stats */ 3800 if (vd->vdev_mg != NULL && !vd->vdev_islog) { 3801 mutex_enter(&rvd->vdev_stat_lock); 3802 rvd->vdev_stat.vs_alloc += alloc_delta; 3803 rvd->vdev_stat.vs_space += space_delta; 3804 rvd->vdev_stat.vs_dspace += dspace_delta; 3805 mutex_exit(&rvd->vdev_stat_lock); 3806 } 3807 /* Note: metaslab_class_space_update moved to metaslab_space_update */ 3808 } 3809 3810 /* 3811 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3812 * so that it will be written out next time the vdev configuration is synced. 3813 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3814 */ 3815 void 3816 vdev_config_dirty(vdev_t *vd) 3817 { 3818 spa_t *spa = vd->vdev_spa; 3819 vdev_t *rvd = spa->spa_root_vdev; 3820 int c; 3821 3822 ASSERT(spa_writeable(spa)); 3823 3824 /* 3825 * If this is an aux vdev (as with l2cache and spare devices), then we 3826 * update the vdev config manually and set the sync flag. 3827 */ 3828 if (vd->vdev_aux != NULL) { 3829 spa_aux_vdev_t *sav = vd->vdev_aux; 3830 nvlist_t **aux; 3831 uint_t naux; 3832 3833 for (c = 0; c < sav->sav_count; c++) { 3834 if (sav->sav_vdevs[c] == vd) 3835 break; 3836 } 3837 3838 if (c == sav->sav_count) { 3839 /* 3840 * We're being removed. There's nothing more to do. 3841 */ 3842 ASSERT(sav->sav_sync == B_TRUE); 3843 return; 3844 } 3845 3846 sav->sav_sync = B_TRUE; 3847 3848 if (nvlist_lookup_nvlist_array(sav->sav_config, 3849 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3850 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3851 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3852 } 3853 3854 ASSERT(c < naux); 3855 3856 /* 3857 * Setting the nvlist in the middle if the array is a little 3858 * sketchy, but it will work. 3859 */ 3860 nvlist_free(aux[c]); 3861 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3862 3863 return; 3864 } 3865 3866 /* 3867 * The dirty list is protected by the SCL_CONFIG lock. The caller 3868 * must either hold SCL_CONFIG as writer, or must be the sync thread 3869 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3870 * so this is sufficient to ensure mutual exclusion. 3871 */ 3872 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3873 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3874 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3875 3876 if (vd == rvd) { 3877 for (c = 0; c < rvd->vdev_children; c++) 3878 vdev_config_dirty(rvd->vdev_child[c]); 3879 } else { 3880 ASSERT(vd == vd->vdev_top); 3881 3882 if (!list_link_active(&vd->vdev_config_dirty_node) && 3883 vdev_is_concrete(vd)) { 3884 list_insert_head(&spa->spa_config_dirty_list, vd); 3885 } 3886 } 3887 } 3888 3889 void 3890 vdev_config_clean(vdev_t *vd) 3891 { 3892 spa_t *spa = vd->vdev_spa; 3893 3894 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3895 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3896 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3897 3898 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3899 list_remove(&spa->spa_config_dirty_list, vd); 3900 } 3901 3902 /* 3903 * Mark a top-level vdev's state as dirty, so that the next pass of 3904 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3905 * the state changes from larger config changes because they require 3906 * much less locking, and are often needed for administrative actions. 3907 */ 3908 void 3909 vdev_state_dirty(vdev_t *vd) 3910 { 3911 spa_t *spa = vd->vdev_spa; 3912 3913 ASSERT(spa_writeable(spa)); 3914 ASSERT(vd == vd->vdev_top); 3915 3916 /* 3917 * The state list is protected by the SCL_STATE lock. The caller 3918 * must either hold SCL_STATE as writer, or must be the sync thread 3919 * (which holds SCL_STATE as reader). There's only one sync thread, 3920 * so this is sufficient to ensure mutual exclusion. 3921 */ 3922 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3923 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3924 spa_config_held(spa, SCL_STATE, RW_READER))); 3925 3926 if (!list_link_active(&vd->vdev_state_dirty_node) && 3927 vdev_is_concrete(vd)) 3928 list_insert_head(&spa->spa_state_dirty_list, vd); 3929 } 3930 3931 void 3932 vdev_state_clean(vdev_t *vd) 3933 { 3934 spa_t *spa = vd->vdev_spa; 3935 3936 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3937 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3938 spa_config_held(spa, SCL_STATE, RW_READER))); 3939 3940 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3941 list_remove(&spa->spa_state_dirty_list, vd); 3942 } 3943 3944 /* 3945 * Propagate vdev state up from children to parent. 3946 */ 3947 void 3948 vdev_propagate_state(vdev_t *vd) 3949 { 3950 spa_t *spa = vd->vdev_spa; 3951 vdev_t *rvd = spa->spa_root_vdev; 3952 int degraded = 0, faulted = 0; 3953 int corrupted = 0; 3954 vdev_t *child; 3955 3956 if (vd->vdev_children > 0) { 3957 for (int c = 0; c < vd->vdev_children; c++) { 3958 child = vd->vdev_child[c]; 3959 3960 /* 3961 * Don't factor holes or indirect vdevs into the 3962 * decision. 3963 */ 3964 if (!vdev_is_concrete(child)) 3965 continue; 3966 3967 if (!vdev_readable(child) || 3968 (!vdev_writeable(child) && spa_writeable(spa))) { 3969 /* 3970 * Root special: if there is a top-level log 3971 * device, treat the root vdev as if it were 3972 * degraded. 3973 */ 3974 if (child->vdev_islog && vd == rvd) 3975 degraded++; 3976 else 3977 faulted++; 3978 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3979 degraded++; 3980 } 3981 3982 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3983 corrupted++; 3984 } 3985 3986 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3987 3988 /* 3989 * Root special: if there is a top-level vdev that cannot be 3990 * opened due to corrupted metadata, then propagate the root 3991 * vdev's aux state as 'corrupt' rather than 'insufficient 3992 * replicas'. 3993 */ 3994 if (corrupted && vd == rvd && 3995 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3996 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3997 VDEV_AUX_CORRUPT_DATA); 3998 } 3999 4000 if (vd->vdev_parent) 4001 vdev_propagate_state(vd->vdev_parent); 4002 } 4003 4004 /* 4005 * Set a vdev's state. If this is during an open, we don't update the parent 4006 * state, because we're in the process of opening children depth-first. 4007 * Otherwise, we propagate the change to the parent. 4008 * 4009 * If this routine places a device in a faulted state, an appropriate ereport is 4010 * generated. 4011 */ 4012 void 4013 vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 4014 { 4015 uint64_t save_state; 4016 spa_t *spa = vd->vdev_spa; 4017 4018 if (state == vd->vdev_state) { 4019 vd->vdev_stat.vs_aux = aux; 4020 return; 4021 } 4022 4023 save_state = vd->vdev_state; 4024 4025 vd->vdev_state = state; 4026 vd->vdev_stat.vs_aux = aux; 4027 4028 /* 4029 * If we are setting the vdev state to anything but an open state, then 4030 * always close the underlying device unless the device has requested 4031 * a delayed close (i.e. we're about to remove or fault the device). 4032 * Otherwise, we keep accessible but invalid devices open forever. 4033 * We don't call vdev_close() itself, because that implies some extra 4034 * checks (offline, etc) that we don't want here. This is limited to 4035 * leaf devices, because otherwise closing the device will affect other 4036 * children. 4037 */ 4038 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 4039 vd->vdev_ops->vdev_op_leaf) 4040 vd->vdev_ops->vdev_op_close(vd); 4041 4042 /* 4043 * If we have brought this vdev back into service, we need 4044 * to notify fmd so that it can gracefully repair any outstanding 4045 * cases due to a missing device. We do this in all cases, even those 4046 * that probably don't correlate to a repaired fault. This is sure to 4047 * catch all cases, and we let the zfs-retire agent sort it out. If 4048 * this is a transient state it's OK, as the retire agent will 4049 * double-check the state of the vdev before repairing it. 4050 */ 4051 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 4052 vd->vdev_prevstate != state) 4053 zfs_post_state_change(spa, vd); 4054 4055 if (vd->vdev_removed && 4056 state == VDEV_STATE_CANT_OPEN && 4057 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 4058 /* 4059 * If the previous state is set to VDEV_STATE_REMOVED, then this 4060 * device was previously marked removed and someone attempted to 4061 * reopen it. If this failed due to a nonexistent device, then 4062 * keep the device in the REMOVED state. We also let this be if 4063 * it is one of our special test online cases, which is only 4064 * attempting to online the device and shouldn't generate an FMA 4065 * fault. 4066 */ 4067 vd->vdev_state = VDEV_STATE_REMOVED; 4068 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 4069 } else if (state == VDEV_STATE_REMOVED) { 4070 vd->vdev_removed = B_TRUE; 4071 } else if (state == VDEV_STATE_CANT_OPEN) { 4072 /* 4073 * If we fail to open a vdev during an import or recovery, we 4074 * mark it as "not available", which signifies that it was 4075 * never there to begin with. Failure to open such a device 4076 * is not considered an error. 4077 */ 4078 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 4079 spa_load_state(spa) == SPA_LOAD_RECOVER) && 4080 vd->vdev_ops->vdev_op_leaf) 4081 vd->vdev_not_present = 1; 4082 4083 /* 4084 * Post the appropriate ereport. If the 'prevstate' field is 4085 * set to something other than VDEV_STATE_UNKNOWN, it indicates 4086 * that this is part of a vdev_reopen(). In this case, we don't 4087 * want to post the ereport if the device was already in the 4088 * CANT_OPEN state beforehand. 4089 * 4090 * If the 'checkremove' flag is set, then this is an attempt to 4091 * online the device in response to an insertion event. If we 4092 * hit this case, then we have detected an insertion event for a 4093 * faulted or offline device that wasn't in the removed state. 4094 * In this scenario, we don't post an ereport because we are 4095 * about to replace the device, or attempt an online with 4096 * vdev_forcefault, which will generate the fault for us. 4097 */ 4098 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 4099 !vd->vdev_not_present && !vd->vdev_checkremove && 4100 vd != spa->spa_root_vdev) { 4101 const char *class; 4102 4103 switch (aux) { 4104 case VDEV_AUX_OPEN_FAILED: 4105 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 4106 break; 4107 case VDEV_AUX_CORRUPT_DATA: 4108 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 4109 break; 4110 case VDEV_AUX_NO_REPLICAS: 4111 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 4112 break; 4113 case VDEV_AUX_BAD_GUID_SUM: 4114 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 4115 break; 4116 case VDEV_AUX_TOO_SMALL: 4117 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 4118 break; 4119 case VDEV_AUX_BAD_LABEL: 4120 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 4121 break; 4122 default: 4123 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 4124 } 4125 4126 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 4127 } 4128 4129 /* Erase any notion of persistent removed state */ 4130 vd->vdev_removed = B_FALSE; 4131 } else { 4132 vd->vdev_removed = B_FALSE; 4133 } 4134 4135 if (!isopen && vd->vdev_parent) 4136 vdev_propagate_state(vd->vdev_parent); 4137 } 4138 4139 boolean_t 4140 vdev_children_are_offline(vdev_t *vd) 4141 { 4142 ASSERT(!vd->vdev_ops->vdev_op_leaf); 4143 4144 for (uint64_t i = 0; i < vd->vdev_children; i++) { 4145 if (vd->vdev_child[i]->vdev_state != VDEV_STATE_OFFLINE) 4146 return (B_FALSE); 4147 } 4148 4149 return (B_TRUE); 4150 } 4151 4152 /* 4153 * Check the vdev configuration to ensure that it's capable of supporting 4154 * a root pool. We do not support partial configuration. 4155 * In addition, only a single top-level vdev is allowed. 4156 */ 4157 boolean_t 4158 vdev_is_bootable(vdev_t *vd) 4159 { 4160 if (!vd->vdev_ops->vdev_op_leaf) { 4161 char *vdev_type = vd->vdev_ops->vdev_op_type; 4162 4163 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 4164 vd->vdev_children > 1) { 4165 return (B_FALSE); 4166 } else if (strcmp(vdev_type, VDEV_TYPE_MISSING) == 0 || 4167 strcmp(vdev_type, VDEV_TYPE_INDIRECT) == 0) { 4168 return (B_FALSE); 4169 } 4170 } 4171 4172 for (int c = 0; c < vd->vdev_children; c++) { 4173 if (!vdev_is_bootable(vd->vdev_child[c])) 4174 return (B_FALSE); 4175 } 4176 return (B_TRUE); 4177 } 4178 4179 boolean_t 4180 vdev_is_concrete(vdev_t *vd) 4181 { 4182 vdev_ops_t *ops = vd->vdev_ops; 4183 if (ops == &vdev_indirect_ops || ops == &vdev_hole_ops || 4184 ops == &vdev_missing_ops || ops == &vdev_root_ops) { 4185 return (B_FALSE); 4186 } else { 4187 return (B_TRUE); 4188 } 4189 } 4190 4191 /* 4192 * Determine if a log device has valid content. If the vdev was 4193 * removed or faulted in the MOS config then we know that 4194 * the content on the log device has already been written to the pool. 4195 */ 4196 boolean_t 4197 vdev_log_state_valid(vdev_t *vd) 4198 { 4199 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 4200 !vd->vdev_removed) 4201 return (B_TRUE); 4202 4203 for (int c = 0; c < vd->vdev_children; c++) 4204 if (vdev_log_state_valid(vd->vdev_child[c])) 4205 return (B_TRUE); 4206 4207 return (B_FALSE); 4208 } 4209 4210 /* 4211 * Expand a vdev if possible. 4212 */ 4213 void 4214 vdev_expand(vdev_t *vd, uint64_t txg) 4215 { 4216 ASSERT(vd->vdev_top == vd); 4217 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 4218 ASSERT(vdev_is_concrete(vd)); 4219 4220 vdev_set_deflate_ratio(vd); 4221 4222 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count && 4223 vdev_is_concrete(vd)) { 4224 vdev_metaslab_group_create(vd); 4225 VERIFY(vdev_metaslab_init(vd, txg) == 0); 4226 vdev_config_dirty(vd); 4227 } 4228 } 4229 4230 /* 4231 * Split a vdev. 4232 */ 4233 void 4234 vdev_split(vdev_t *vd) 4235 { 4236 vdev_t *cvd, *pvd = vd->vdev_parent; 4237 4238 vdev_remove_child(pvd, vd); 4239 vdev_compact_children(pvd); 4240 4241 cvd = pvd->vdev_child[0]; 4242 if (pvd->vdev_children == 1) { 4243 vdev_remove_parent(cvd); 4244 cvd->vdev_splitting = B_TRUE; 4245 } 4246 vdev_propagate_state(cvd); 4247 } 4248 4249 void 4250 vdev_deadman(vdev_t *vd) 4251 { 4252 for (int c = 0; c < vd->vdev_children; c++) { 4253 vdev_t *cvd = vd->vdev_child[c]; 4254 4255 vdev_deadman(cvd); 4256 } 4257 4258 if (vd->vdev_ops->vdev_op_leaf) { 4259 vdev_queue_t *vq = &vd->vdev_queue; 4260 4261 mutex_enter(&vq->vq_lock); 4262 if (avl_numnodes(&vq->vq_active_tree) > 0) { 4263 spa_t *spa = vd->vdev_spa; 4264 zio_t *fio; 4265 uint64_t delta; 4266 4267 /* 4268 * Look at the head of all the pending queues, 4269 * if any I/O has been outstanding for longer than 4270 * the spa_deadman_synctime we panic the system. 4271 */ 4272 fio = avl_first(&vq->vq_active_tree); 4273 delta = gethrtime() - fio->io_timestamp; 4274 if (delta > spa_deadman_synctime(spa)) { 4275 vdev_dbgmsg(vd, "SLOW IO: zio timestamp " 4276 "%lluns, delta %lluns, last io %lluns", 4277 fio->io_timestamp, (u_longlong_t)delta, 4278 vq->vq_io_complete_ts); 4279 fm_panic("I/O to pool '%s' appears to be " 4280 "hung.", spa_name(spa)); 4281 } 4282 } 4283 mutex_exit(&vq->vq_lock); 4284 } 4285 } 4286