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