vdev.c revision 277553
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 26 * Copyright 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 */ 28 29#include <sys/zfs_context.h> 30#include <sys/fm/fs/zfs.h> 31#include <sys/spa.h> 32#include <sys/spa_impl.h> 33#include <sys/dmu.h> 34#include <sys/dmu_tx.h> 35#include <sys/vdev_impl.h> 36#include <sys/uberblock_impl.h> 37#include <sys/metaslab.h> 38#include <sys/metaslab_impl.h> 39#include <sys/space_map.h> 40#include <sys/space_reftree.h> 41#include <sys/zio.h> 42#include <sys/zap.h> 43#include <sys/fs/zfs.h> 44#include <sys/arc.h> 45#include <sys/zil.h> 46#include <sys/dsl_scan.h> 47#include <sys/trim_map.h> 48 49SYSCTL_DECL(_vfs_zfs); 50SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 51 52/* 53 * Virtual device management. 54 */ 55 56/* 57 * The limit for ZFS to automatically increase a top-level vdev's ashift 58 * from logical ashift to physical ashift. 59 * 60 * Example: one or more 512B emulation child vdevs 61 * child->vdev_ashift = 9 (512 bytes) 62 * child->vdev_physical_ashift = 12 (4096 bytes) 63 * zfs_max_auto_ashift = 11 (2048 bytes) 64 * zfs_min_auto_ashift = 9 (512 bytes) 65 * 66 * On pool creation or the addition of a new top-level vdev, ZFS will 67 * increase the ashift of the top-level vdev to 2048 as limited by 68 * zfs_max_auto_ashift. 69 * 70 * Example: one or more 512B emulation child vdevs 71 * child->vdev_ashift = 9 (512 bytes) 72 * child->vdev_physical_ashift = 12 (4096 bytes) 73 * zfs_max_auto_ashift = 13 (8192 bytes) 74 * zfs_min_auto_ashift = 9 (512 bytes) 75 * 76 * On pool creation or the addition of a new top-level vdev, ZFS will 77 * increase the ashift of the top-level vdev to 4096 to match the 78 * max vdev_physical_ashift. 79 * 80 * Example: one or more 512B emulation child vdevs 81 * child->vdev_ashift = 9 (512 bytes) 82 * child->vdev_physical_ashift = 9 (512 bytes) 83 * zfs_max_auto_ashift = 13 (8192 bytes) 84 * zfs_min_auto_ashift = 12 (4096 bytes) 85 * 86 * On pool creation or the addition of a new top-level vdev, ZFS will 87 * increase the ashift of the top-level vdev to 4096 to match the 88 * zfs_min_auto_ashift. 89 */ 90static uint64_t zfs_max_auto_ashift = SPA_MAXASHIFT; 91static uint64_t zfs_min_auto_ashift = SPA_MINASHIFT; 92 93static int 94sysctl_vfs_zfs_max_auto_ashift(SYSCTL_HANDLER_ARGS) 95{ 96 uint64_t val; 97 int err; 98 99 val = zfs_max_auto_ashift; 100 err = sysctl_handle_64(oidp, &val, 0, req); 101 if (err != 0 || req->newptr == NULL) 102 return (err); 103 104 if (val > SPA_MAXASHIFT || val < zfs_min_auto_ashift) 105 return (EINVAL); 106 107 zfs_max_auto_ashift = val; 108 109 return (0); 110} 111SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift, 112 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 113 sysctl_vfs_zfs_max_auto_ashift, "QU", 114 "Max ashift used when optimising for logical -> physical sectors size on " 115 "new top-level vdevs."); 116 117static int 118sysctl_vfs_zfs_min_auto_ashift(SYSCTL_HANDLER_ARGS) 119{ 120 uint64_t val; 121 int err; 122 123 val = zfs_min_auto_ashift; 124 err = sysctl_handle_64(oidp, &val, 0, req); 125 if (err != 0 || req->newptr == NULL) 126 return (err); 127 128 if (val < SPA_MINASHIFT || val > zfs_max_auto_ashift) 129 return (EINVAL); 130 131 zfs_min_auto_ashift = val; 132 133 return (0); 134} 135SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift, 136 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 137 sysctl_vfs_zfs_min_auto_ashift, "QU", 138 "Min ashift used when creating new top-level vdevs."); 139 140static vdev_ops_t *vdev_ops_table[] = { 141 &vdev_root_ops, 142 &vdev_raidz_ops, 143 &vdev_mirror_ops, 144 &vdev_replacing_ops, 145 &vdev_spare_ops, 146#ifdef _KERNEL 147 &vdev_geom_ops, 148#else 149 &vdev_disk_ops, 150#endif 151 &vdev_file_ops, 152 &vdev_missing_ops, 153 &vdev_hole_ops, 154 NULL 155}; 156 157 158/* 159 * When a vdev is added, it will be divided into approximately (but no 160 * more than) this number of metaslabs. 161 */ 162int metaslabs_per_vdev = 200; 163SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, metaslabs_per_vdev, CTLFLAG_RDTUN, 164 &metaslabs_per_vdev, 0, 165 "When a vdev is added, how many metaslabs the vdev should be divided into"); 166 167/* 168 * Given a vdev type, return the appropriate ops vector. 169 */ 170static vdev_ops_t * 171vdev_getops(const char *type) 172{ 173 vdev_ops_t *ops, **opspp; 174 175 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 176 if (strcmp(ops->vdev_op_type, type) == 0) 177 break; 178 179 return (ops); 180} 181 182/* 183 * Default asize function: return the MAX of psize with the asize of 184 * all children. This is what's used by anything other than RAID-Z. 185 */ 186uint64_t 187vdev_default_asize(vdev_t *vd, uint64_t psize) 188{ 189 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 190 uint64_t csize; 191 192 for (int c = 0; c < vd->vdev_children; c++) { 193 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 194 asize = MAX(asize, csize); 195 } 196 197 return (asize); 198} 199 200/* 201 * Get the minimum allocatable size. We define the allocatable size as 202 * the vdev's asize rounded to the nearest metaslab. This allows us to 203 * replace or attach devices which don't have the same physical size but 204 * can still satisfy the same number of allocations. 205 */ 206uint64_t 207vdev_get_min_asize(vdev_t *vd) 208{ 209 vdev_t *pvd = vd->vdev_parent; 210 211 /* 212 * If our parent is NULL (inactive spare or cache) or is the root, 213 * just return our own asize. 214 */ 215 if (pvd == NULL) 216 return (vd->vdev_asize); 217 218 /* 219 * The top-level vdev just returns the allocatable size rounded 220 * to the nearest metaslab. 221 */ 222 if (vd == vd->vdev_top) 223 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 224 225 /* 226 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 227 * so each child must provide at least 1/Nth of its asize. 228 */ 229 if (pvd->vdev_ops == &vdev_raidz_ops) 230 return (pvd->vdev_min_asize / pvd->vdev_children); 231 232 return (pvd->vdev_min_asize); 233} 234 235void 236vdev_set_min_asize(vdev_t *vd) 237{ 238 vd->vdev_min_asize = vdev_get_min_asize(vd); 239 240 for (int c = 0; c < vd->vdev_children; c++) 241 vdev_set_min_asize(vd->vdev_child[c]); 242} 243 244vdev_t * 245vdev_lookup_top(spa_t *spa, uint64_t vdev) 246{ 247 vdev_t *rvd = spa->spa_root_vdev; 248 249 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 250 251 if (vdev < rvd->vdev_children) { 252 ASSERT(rvd->vdev_child[vdev] != NULL); 253 return (rvd->vdev_child[vdev]); 254 } 255 256 return (NULL); 257} 258 259vdev_t * 260vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 261{ 262 vdev_t *mvd; 263 264 if (vd->vdev_guid == guid) 265 return (vd); 266 267 for (int c = 0; c < vd->vdev_children; c++) 268 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 269 NULL) 270 return (mvd); 271 272 return (NULL); 273} 274 275void 276vdev_add_child(vdev_t *pvd, vdev_t *cvd) 277{ 278 size_t oldsize, newsize; 279 uint64_t id = cvd->vdev_id; 280 vdev_t **newchild; 281 282 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 283 ASSERT(cvd->vdev_parent == NULL); 284 285 cvd->vdev_parent = pvd; 286 287 if (pvd == NULL) 288 return; 289 290 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 291 292 oldsize = pvd->vdev_children * sizeof (vdev_t *); 293 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 294 newsize = pvd->vdev_children * sizeof (vdev_t *); 295 296 newchild = kmem_zalloc(newsize, KM_SLEEP); 297 if (pvd->vdev_child != NULL) { 298 bcopy(pvd->vdev_child, newchild, oldsize); 299 kmem_free(pvd->vdev_child, oldsize); 300 } 301 302 pvd->vdev_child = newchild; 303 pvd->vdev_child[id] = cvd; 304 305 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 306 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 307 308 /* 309 * Walk up all ancestors to update guid sum. 310 */ 311 for (; pvd != NULL; pvd = pvd->vdev_parent) 312 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 313} 314 315void 316vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 317{ 318 int c; 319 uint_t id = cvd->vdev_id; 320 321 ASSERT(cvd->vdev_parent == pvd); 322 323 if (pvd == NULL) 324 return; 325 326 ASSERT(id < pvd->vdev_children); 327 ASSERT(pvd->vdev_child[id] == cvd); 328 329 pvd->vdev_child[id] = NULL; 330 cvd->vdev_parent = NULL; 331 332 for (c = 0; c < pvd->vdev_children; c++) 333 if (pvd->vdev_child[c]) 334 break; 335 336 if (c == pvd->vdev_children) { 337 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 338 pvd->vdev_child = NULL; 339 pvd->vdev_children = 0; 340 } 341 342 /* 343 * Walk up all ancestors to update guid sum. 344 */ 345 for (; pvd != NULL; pvd = pvd->vdev_parent) 346 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 347} 348 349/* 350 * Remove any holes in the child array. 351 */ 352void 353vdev_compact_children(vdev_t *pvd) 354{ 355 vdev_t **newchild, *cvd; 356 int oldc = pvd->vdev_children; 357 int newc; 358 359 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 360 361 for (int c = newc = 0; c < oldc; c++) 362 if (pvd->vdev_child[c]) 363 newc++; 364 365 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 366 367 for (int c = newc = 0; c < oldc; c++) { 368 if ((cvd = pvd->vdev_child[c]) != NULL) { 369 newchild[newc] = cvd; 370 cvd->vdev_id = newc++; 371 } 372 } 373 374 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 375 pvd->vdev_child = newchild; 376 pvd->vdev_children = newc; 377} 378 379/* 380 * Allocate and minimally initialize a vdev_t. 381 */ 382vdev_t * 383vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 384{ 385 vdev_t *vd; 386 387 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 388 389 if (spa->spa_root_vdev == NULL) { 390 ASSERT(ops == &vdev_root_ops); 391 spa->spa_root_vdev = vd; 392 spa->spa_load_guid = spa_generate_guid(NULL); 393 } 394 395 if (guid == 0 && ops != &vdev_hole_ops) { 396 if (spa->spa_root_vdev == vd) { 397 /* 398 * The root vdev's guid will also be the pool guid, 399 * which must be unique among all pools. 400 */ 401 guid = spa_generate_guid(NULL); 402 } else { 403 /* 404 * Any other vdev's guid must be unique within the pool. 405 */ 406 guid = spa_generate_guid(spa); 407 } 408 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 409 } 410 411 vd->vdev_spa = spa; 412 vd->vdev_id = id; 413 vd->vdev_guid = guid; 414 vd->vdev_guid_sum = guid; 415 vd->vdev_ops = ops; 416 vd->vdev_state = VDEV_STATE_CLOSED; 417 vd->vdev_ishole = (ops == &vdev_hole_ops); 418 419 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 420 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 421 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 422 for (int t = 0; t < DTL_TYPES; t++) { 423 vd->vdev_dtl[t] = range_tree_create(NULL, NULL, 424 &vd->vdev_dtl_lock); 425 } 426 txg_list_create(&vd->vdev_ms_list, 427 offsetof(struct metaslab, ms_txg_node)); 428 txg_list_create(&vd->vdev_dtl_list, 429 offsetof(struct vdev, vdev_dtl_node)); 430 vd->vdev_stat.vs_timestamp = gethrtime(); 431 vdev_queue_init(vd); 432 vdev_cache_init(vd); 433 434 return (vd); 435} 436 437/* 438 * Allocate a new vdev. The 'alloctype' is used to control whether we are 439 * creating a new vdev or loading an existing one - the behavior is slightly 440 * different for each case. 441 */ 442int 443vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 444 int alloctype) 445{ 446 vdev_ops_t *ops; 447 char *type; 448 uint64_t guid = 0, islog, nparity; 449 vdev_t *vd; 450 451 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 452 453 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 454 return (SET_ERROR(EINVAL)); 455 456 if ((ops = vdev_getops(type)) == NULL) 457 return (SET_ERROR(EINVAL)); 458 459 /* 460 * If this is a load, get the vdev guid from the nvlist. 461 * Otherwise, vdev_alloc_common() will generate one for us. 462 */ 463 if (alloctype == VDEV_ALLOC_LOAD) { 464 uint64_t label_id; 465 466 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 467 label_id != id) 468 return (SET_ERROR(EINVAL)); 469 470 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 471 return (SET_ERROR(EINVAL)); 472 } else if (alloctype == VDEV_ALLOC_SPARE) { 473 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 474 return (SET_ERROR(EINVAL)); 475 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 476 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 477 return (SET_ERROR(EINVAL)); 478 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 479 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 480 return (SET_ERROR(EINVAL)); 481 } 482 483 /* 484 * The first allocated vdev must be of type 'root'. 485 */ 486 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 487 return (SET_ERROR(EINVAL)); 488 489 /* 490 * Determine whether we're a log vdev. 491 */ 492 islog = 0; 493 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 494 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 495 return (SET_ERROR(ENOTSUP)); 496 497 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 498 return (SET_ERROR(ENOTSUP)); 499 500 /* 501 * Set the nparity property for RAID-Z vdevs. 502 */ 503 nparity = -1ULL; 504 if (ops == &vdev_raidz_ops) { 505 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 506 &nparity) == 0) { 507 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 508 return (SET_ERROR(EINVAL)); 509 /* 510 * Previous versions could only support 1 or 2 parity 511 * device. 512 */ 513 if (nparity > 1 && 514 spa_version(spa) < SPA_VERSION_RAIDZ2) 515 return (SET_ERROR(ENOTSUP)); 516 if (nparity > 2 && 517 spa_version(spa) < SPA_VERSION_RAIDZ3) 518 return (SET_ERROR(ENOTSUP)); 519 } else { 520 /* 521 * We require the parity to be specified for SPAs that 522 * support multiple parity levels. 523 */ 524 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 525 return (SET_ERROR(EINVAL)); 526 /* 527 * Otherwise, we default to 1 parity device for RAID-Z. 528 */ 529 nparity = 1; 530 } 531 } else { 532 nparity = 0; 533 } 534 ASSERT(nparity != -1ULL); 535 536 vd = vdev_alloc_common(spa, id, guid, ops); 537 538 vd->vdev_islog = islog; 539 vd->vdev_nparity = nparity; 540 541 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 542 vd->vdev_path = spa_strdup(vd->vdev_path); 543 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 544 vd->vdev_devid = spa_strdup(vd->vdev_devid); 545 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 546 &vd->vdev_physpath) == 0) 547 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 548 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 549 vd->vdev_fru = spa_strdup(vd->vdev_fru); 550 551 /* 552 * Set the whole_disk property. If it's not specified, leave the value 553 * as -1. 554 */ 555 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 556 &vd->vdev_wholedisk) != 0) 557 vd->vdev_wholedisk = -1ULL; 558 559 /* 560 * Look for the 'not present' flag. This will only be set if the device 561 * was not present at the time of import. 562 */ 563 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 564 &vd->vdev_not_present); 565 566 /* 567 * Get the alignment requirement. 568 */ 569 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 570 571 /* 572 * Retrieve the vdev creation time. 573 */ 574 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 575 &vd->vdev_crtxg); 576 577 /* 578 * If we're a top-level vdev, try to load the allocation parameters. 579 */ 580 if (parent && !parent->vdev_parent && 581 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 582 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 583 &vd->vdev_ms_array); 584 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 585 &vd->vdev_ms_shift); 586 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 587 &vd->vdev_asize); 588 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 589 &vd->vdev_removing); 590 } 591 592 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 593 ASSERT(alloctype == VDEV_ALLOC_LOAD || 594 alloctype == VDEV_ALLOC_ADD || 595 alloctype == VDEV_ALLOC_SPLIT || 596 alloctype == VDEV_ALLOC_ROOTPOOL); 597 vd->vdev_mg = metaslab_group_create(islog ? 598 spa_log_class(spa) : spa_normal_class(spa), vd); 599 } 600 601 /* 602 * If we're a leaf vdev, try to load the DTL object and other state. 603 */ 604 if (vd->vdev_ops->vdev_op_leaf && 605 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 606 alloctype == VDEV_ALLOC_ROOTPOOL)) { 607 if (alloctype == VDEV_ALLOC_LOAD) { 608 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 609 &vd->vdev_dtl_object); 610 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 611 &vd->vdev_unspare); 612 } 613 614 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 615 uint64_t spare = 0; 616 617 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 618 &spare) == 0 && spare) 619 spa_spare_add(vd); 620 } 621 622 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 623 &vd->vdev_offline); 624 625 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 626 &vd->vdev_resilver_txg); 627 628 /* 629 * When importing a pool, we want to ignore the persistent fault 630 * state, as the diagnosis made on another system may not be 631 * valid in the current context. Local vdevs will 632 * remain in the faulted state. 633 */ 634 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 635 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 636 &vd->vdev_faulted); 637 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 638 &vd->vdev_degraded); 639 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 640 &vd->vdev_removed); 641 642 if (vd->vdev_faulted || vd->vdev_degraded) { 643 char *aux; 644 645 vd->vdev_label_aux = 646 VDEV_AUX_ERR_EXCEEDED; 647 if (nvlist_lookup_string(nv, 648 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 649 strcmp(aux, "external") == 0) 650 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 651 } 652 } 653 } 654 655 /* 656 * Add ourselves to the parent's list of children. 657 */ 658 vdev_add_child(parent, vd); 659 660 *vdp = vd; 661 662 return (0); 663} 664 665void 666vdev_free(vdev_t *vd) 667{ 668 spa_t *spa = vd->vdev_spa; 669 670 /* 671 * vdev_free() implies closing the vdev first. This is simpler than 672 * trying to ensure complicated semantics for all callers. 673 */ 674 vdev_close(vd); 675 676 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 677 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 678 679 /* 680 * Free all children. 681 */ 682 for (int c = 0; c < vd->vdev_children; c++) 683 vdev_free(vd->vdev_child[c]); 684 685 ASSERT(vd->vdev_child == NULL); 686 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 687 688 /* 689 * Discard allocation state. 690 */ 691 if (vd->vdev_mg != NULL) { 692 vdev_metaslab_fini(vd); 693 metaslab_group_destroy(vd->vdev_mg); 694 } 695 696 ASSERT0(vd->vdev_stat.vs_space); 697 ASSERT0(vd->vdev_stat.vs_dspace); 698 ASSERT0(vd->vdev_stat.vs_alloc); 699 700 /* 701 * Remove this vdev from its parent's child list. 702 */ 703 vdev_remove_child(vd->vdev_parent, vd); 704 705 ASSERT(vd->vdev_parent == NULL); 706 707 /* 708 * Clean up vdev structure. 709 */ 710 vdev_queue_fini(vd); 711 vdev_cache_fini(vd); 712 713 if (vd->vdev_path) 714 spa_strfree(vd->vdev_path); 715 if (vd->vdev_devid) 716 spa_strfree(vd->vdev_devid); 717 if (vd->vdev_physpath) 718 spa_strfree(vd->vdev_physpath); 719 if (vd->vdev_fru) 720 spa_strfree(vd->vdev_fru); 721 722 if (vd->vdev_isspare) 723 spa_spare_remove(vd); 724 if (vd->vdev_isl2cache) 725 spa_l2cache_remove(vd); 726 727 txg_list_destroy(&vd->vdev_ms_list); 728 txg_list_destroy(&vd->vdev_dtl_list); 729 730 mutex_enter(&vd->vdev_dtl_lock); 731 space_map_close(vd->vdev_dtl_sm); 732 for (int t = 0; t < DTL_TYPES; t++) { 733 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 734 range_tree_destroy(vd->vdev_dtl[t]); 735 } 736 mutex_exit(&vd->vdev_dtl_lock); 737 738 mutex_destroy(&vd->vdev_dtl_lock); 739 mutex_destroy(&vd->vdev_stat_lock); 740 mutex_destroy(&vd->vdev_probe_lock); 741 742 if (vd == spa->spa_root_vdev) 743 spa->spa_root_vdev = NULL; 744 745 kmem_free(vd, sizeof (vdev_t)); 746} 747 748/* 749 * Transfer top-level vdev state from svd to tvd. 750 */ 751static void 752vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 753{ 754 spa_t *spa = svd->vdev_spa; 755 metaslab_t *msp; 756 vdev_t *vd; 757 int t; 758 759 ASSERT(tvd == tvd->vdev_top); 760 761 tvd->vdev_ms_array = svd->vdev_ms_array; 762 tvd->vdev_ms_shift = svd->vdev_ms_shift; 763 tvd->vdev_ms_count = svd->vdev_ms_count; 764 765 svd->vdev_ms_array = 0; 766 svd->vdev_ms_shift = 0; 767 svd->vdev_ms_count = 0; 768 769 if (tvd->vdev_mg) 770 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 771 tvd->vdev_mg = svd->vdev_mg; 772 tvd->vdev_ms = svd->vdev_ms; 773 774 svd->vdev_mg = NULL; 775 svd->vdev_ms = NULL; 776 777 if (tvd->vdev_mg != NULL) 778 tvd->vdev_mg->mg_vd = tvd; 779 780 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 781 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 782 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 783 784 svd->vdev_stat.vs_alloc = 0; 785 svd->vdev_stat.vs_space = 0; 786 svd->vdev_stat.vs_dspace = 0; 787 788 for (t = 0; t < TXG_SIZE; t++) { 789 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 790 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 791 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 792 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 793 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 794 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 795 } 796 797 if (list_link_active(&svd->vdev_config_dirty_node)) { 798 vdev_config_clean(svd); 799 vdev_config_dirty(tvd); 800 } 801 802 if (list_link_active(&svd->vdev_state_dirty_node)) { 803 vdev_state_clean(svd); 804 vdev_state_dirty(tvd); 805 } 806 807 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 808 svd->vdev_deflate_ratio = 0; 809 810 tvd->vdev_islog = svd->vdev_islog; 811 svd->vdev_islog = 0; 812} 813 814static void 815vdev_top_update(vdev_t *tvd, vdev_t *vd) 816{ 817 if (vd == NULL) 818 return; 819 820 vd->vdev_top = tvd; 821 822 for (int c = 0; c < vd->vdev_children; c++) 823 vdev_top_update(tvd, vd->vdev_child[c]); 824} 825 826/* 827 * Add a mirror/replacing vdev above an existing vdev. 828 */ 829vdev_t * 830vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 831{ 832 spa_t *spa = cvd->vdev_spa; 833 vdev_t *pvd = cvd->vdev_parent; 834 vdev_t *mvd; 835 836 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 837 838 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 839 840 mvd->vdev_asize = cvd->vdev_asize; 841 mvd->vdev_min_asize = cvd->vdev_min_asize; 842 mvd->vdev_max_asize = cvd->vdev_max_asize; 843 mvd->vdev_ashift = cvd->vdev_ashift; 844 mvd->vdev_logical_ashift = cvd->vdev_logical_ashift; 845 mvd->vdev_physical_ashift = cvd->vdev_physical_ashift; 846 mvd->vdev_state = cvd->vdev_state; 847 mvd->vdev_crtxg = cvd->vdev_crtxg; 848 849 vdev_remove_child(pvd, cvd); 850 vdev_add_child(pvd, mvd); 851 cvd->vdev_id = mvd->vdev_children; 852 vdev_add_child(mvd, cvd); 853 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 854 855 if (mvd == mvd->vdev_top) 856 vdev_top_transfer(cvd, mvd); 857 858 return (mvd); 859} 860 861/* 862 * Remove a 1-way mirror/replacing vdev from the tree. 863 */ 864void 865vdev_remove_parent(vdev_t *cvd) 866{ 867 vdev_t *mvd = cvd->vdev_parent; 868 vdev_t *pvd = mvd->vdev_parent; 869 870 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 871 872 ASSERT(mvd->vdev_children == 1); 873 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 874 mvd->vdev_ops == &vdev_replacing_ops || 875 mvd->vdev_ops == &vdev_spare_ops); 876 cvd->vdev_ashift = mvd->vdev_ashift; 877 cvd->vdev_logical_ashift = mvd->vdev_logical_ashift; 878 cvd->vdev_physical_ashift = mvd->vdev_physical_ashift; 879 880 vdev_remove_child(mvd, cvd); 881 vdev_remove_child(pvd, mvd); 882 883 /* 884 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 885 * Otherwise, we could have detached an offline device, and when we 886 * go to import the pool we'll think we have two top-level vdevs, 887 * instead of a different version of the same top-level vdev. 888 */ 889 if (mvd->vdev_top == mvd) { 890 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 891 cvd->vdev_orig_guid = cvd->vdev_guid; 892 cvd->vdev_guid += guid_delta; 893 cvd->vdev_guid_sum += guid_delta; 894 } 895 cvd->vdev_id = mvd->vdev_id; 896 vdev_add_child(pvd, cvd); 897 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 898 899 if (cvd == cvd->vdev_top) 900 vdev_top_transfer(mvd, cvd); 901 902 ASSERT(mvd->vdev_children == 0); 903 vdev_free(mvd); 904} 905 906int 907vdev_metaslab_init(vdev_t *vd, uint64_t txg) 908{ 909 spa_t *spa = vd->vdev_spa; 910 objset_t *mos = spa->spa_meta_objset; 911 uint64_t m; 912 uint64_t oldc = vd->vdev_ms_count; 913 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 914 metaslab_t **mspp; 915 int error; 916 917 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 918 919 /* 920 * This vdev is not being allocated from yet or is a hole. 921 */ 922 if (vd->vdev_ms_shift == 0) 923 return (0); 924 925 ASSERT(!vd->vdev_ishole); 926 927 /* 928 * Compute the raidz-deflation ratio. Note, we hard-code 929 * in 128k (1 << 17) because it is the "typical" blocksize. 930 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change, 931 * otherwise it would inconsistently account for existing bp's. 932 */ 933 vd->vdev_deflate_ratio = (1 << 17) / 934 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 935 936 ASSERT(oldc <= newc); 937 938 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 939 940 if (oldc != 0) { 941 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 942 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 943 } 944 945 vd->vdev_ms = mspp; 946 vd->vdev_ms_count = newc; 947 948 for (m = oldc; m < newc; m++) { 949 uint64_t object = 0; 950 951 if (txg == 0) { 952 error = dmu_read(mos, vd->vdev_ms_array, 953 m * sizeof (uint64_t), sizeof (uint64_t), &object, 954 DMU_READ_PREFETCH); 955 if (error) 956 return (error); 957 } 958 959 error = metaslab_init(vd->vdev_mg, m, object, txg, 960 &(vd->vdev_ms[m])); 961 if (error) 962 return (error); 963 } 964 965 if (txg == 0) 966 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 967 968 /* 969 * If the vdev is being removed we don't activate 970 * the metaslabs since we want to ensure that no new 971 * allocations are performed on this device. 972 */ 973 if (oldc == 0 && !vd->vdev_removing) 974 metaslab_group_activate(vd->vdev_mg); 975 976 if (txg == 0) 977 spa_config_exit(spa, SCL_ALLOC, FTAG); 978 979 return (0); 980} 981 982void 983vdev_metaslab_fini(vdev_t *vd) 984{ 985 uint64_t m; 986 uint64_t count = vd->vdev_ms_count; 987 988 if (vd->vdev_ms != NULL) { 989 metaslab_group_passivate(vd->vdev_mg); 990 for (m = 0; m < count; m++) { 991 metaslab_t *msp = vd->vdev_ms[m]; 992 993 if (msp != NULL) 994 metaslab_fini(msp); 995 } 996 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 997 vd->vdev_ms = NULL; 998 } 999} 1000 1001typedef struct vdev_probe_stats { 1002 boolean_t vps_readable; 1003 boolean_t vps_writeable; 1004 int vps_flags; 1005} vdev_probe_stats_t; 1006 1007static void 1008vdev_probe_done(zio_t *zio) 1009{ 1010 spa_t *spa = zio->io_spa; 1011 vdev_t *vd = zio->io_vd; 1012 vdev_probe_stats_t *vps = zio->io_private; 1013 1014 ASSERT(vd->vdev_probe_zio != NULL); 1015 1016 if (zio->io_type == ZIO_TYPE_READ) { 1017 if (zio->io_error == 0) 1018 vps->vps_readable = 1; 1019 if (zio->io_error == 0 && spa_writeable(spa)) { 1020 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1021 zio->io_offset, zio->io_size, zio->io_data, 1022 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1023 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1024 } else { 1025 zio_buf_free(zio->io_data, zio->io_size); 1026 } 1027 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1028 if (zio->io_error == 0) 1029 vps->vps_writeable = 1; 1030 zio_buf_free(zio->io_data, zio->io_size); 1031 } else if (zio->io_type == ZIO_TYPE_NULL) { 1032 zio_t *pio; 1033 1034 vd->vdev_cant_read |= !vps->vps_readable; 1035 vd->vdev_cant_write |= !vps->vps_writeable; 1036 1037 if (vdev_readable(vd) && 1038 (vdev_writeable(vd) || !spa_writeable(spa))) { 1039 zio->io_error = 0; 1040 } else { 1041 ASSERT(zio->io_error != 0); 1042 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1043 spa, vd, NULL, 0, 0); 1044 zio->io_error = SET_ERROR(ENXIO); 1045 } 1046 1047 mutex_enter(&vd->vdev_probe_lock); 1048 ASSERT(vd->vdev_probe_zio == zio); 1049 vd->vdev_probe_zio = NULL; 1050 mutex_exit(&vd->vdev_probe_lock); 1051 1052 while ((pio = zio_walk_parents(zio)) != NULL) 1053 if (!vdev_accessible(vd, pio)) 1054 pio->io_error = SET_ERROR(ENXIO); 1055 1056 kmem_free(vps, sizeof (*vps)); 1057 } 1058} 1059 1060/* 1061 * Determine whether this device is accessible. 1062 * 1063 * Read and write to several known locations: the pad regions of each 1064 * vdev label but the first, which we leave alone in case it contains 1065 * a VTOC. 1066 */ 1067zio_t * 1068vdev_probe(vdev_t *vd, zio_t *zio) 1069{ 1070 spa_t *spa = vd->vdev_spa; 1071 vdev_probe_stats_t *vps = NULL; 1072 zio_t *pio; 1073 1074 ASSERT(vd->vdev_ops->vdev_op_leaf); 1075 1076 /* 1077 * Don't probe the probe. 1078 */ 1079 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1080 return (NULL); 1081 1082 /* 1083 * To prevent 'probe storms' when a device fails, we create 1084 * just one probe i/o at a time. All zios that want to probe 1085 * this vdev will become parents of the probe io. 1086 */ 1087 mutex_enter(&vd->vdev_probe_lock); 1088 1089 if ((pio = vd->vdev_probe_zio) == NULL) { 1090 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1091 1092 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1093 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1094 ZIO_FLAG_TRYHARD; 1095 1096 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1097 /* 1098 * vdev_cant_read and vdev_cant_write can only 1099 * transition from TRUE to FALSE when we have the 1100 * SCL_ZIO lock as writer; otherwise they can only 1101 * transition from FALSE to TRUE. This ensures that 1102 * any zio looking at these values can assume that 1103 * failures persist for the life of the I/O. That's 1104 * important because when a device has intermittent 1105 * connectivity problems, we want to ensure that 1106 * they're ascribed to the device (ENXIO) and not 1107 * the zio (EIO). 1108 * 1109 * Since we hold SCL_ZIO as writer here, clear both 1110 * values so the probe can reevaluate from first 1111 * principles. 1112 */ 1113 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1114 vd->vdev_cant_read = B_FALSE; 1115 vd->vdev_cant_write = B_FALSE; 1116 } 1117 1118 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1119 vdev_probe_done, vps, 1120 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1121 1122 /* 1123 * We can't change the vdev state in this context, so we 1124 * kick off an async task to do it on our behalf. 1125 */ 1126 if (zio != NULL) { 1127 vd->vdev_probe_wanted = B_TRUE; 1128 spa_async_request(spa, SPA_ASYNC_PROBE); 1129 } 1130 } 1131 1132 if (zio != NULL) 1133 zio_add_child(zio, pio); 1134 1135 mutex_exit(&vd->vdev_probe_lock); 1136 1137 if (vps == NULL) { 1138 ASSERT(zio != NULL); 1139 return (NULL); 1140 } 1141 1142 for (int l = 1; l < VDEV_LABELS; l++) { 1143 zio_nowait(zio_read_phys(pio, vd, 1144 vdev_label_offset(vd->vdev_psize, l, 1145 offsetof(vdev_label_t, vl_pad2)), 1146 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1147 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1148 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1149 } 1150 1151 if (zio == NULL) 1152 return (pio); 1153 1154 zio_nowait(pio); 1155 return (NULL); 1156} 1157 1158static void 1159vdev_open_child(void *arg) 1160{ 1161 vdev_t *vd = arg; 1162 1163 vd->vdev_open_thread = curthread; 1164 vd->vdev_open_error = vdev_open(vd); 1165 vd->vdev_open_thread = NULL; 1166} 1167 1168boolean_t 1169vdev_uses_zvols(vdev_t *vd) 1170{ 1171 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1172 strlen(ZVOL_DIR)) == 0) 1173 return (B_TRUE); 1174 for (int c = 0; c < vd->vdev_children; c++) 1175 if (vdev_uses_zvols(vd->vdev_child[c])) 1176 return (B_TRUE); 1177 return (B_FALSE); 1178} 1179 1180void 1181vdev_open_children(vdev_t *vd) 1182{ 1183 taskq_t *tq; 1184 int children = vd->vdev_children; 1185 1186 /* 1187 * in order to handle pools on top of zvols, do the opens 1188 * in a single thread so that the same thread holds the 1189 * spa_namespace_lock 1190 */ 1191 if (B_TRUE || vdev_uses_zvols(vd)) { 1192 for (int c = 0; c < children; c++) 1193 vd->vdev_child[c]->vdev_open_error = 1194 vdev_open(vd->vdev_child[c]); 1195 return; 1196 } 1197 tq = taskq_create("vdev_open", children, minclsyspri, 1198 children, children, TASKQ_PREPOPULATE); 1199 1200 for (int c = 0; c < children; c++) 1201 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1202 TQ_SLEEP) != 0); 1203 1204 taskq_destroy(tq); 1205} 1206 1207/* 1208 * Prepare a virtual device for access. 1209 */ 1210int 1211vdev_open(vdev_t *vd) 1212{ 1213 spa_t *spa = vd->vdev_spa; 1214 int error; 1215 uint64_t osize = 0; 1216 uint64_t max_osize = 0; 1217 uint64_t asize, max_asize, psize; 1218 uint64_t logical_ashift = 0; 1219 uint64_t physical_ashift = 0; 1220 1221 ASSERT(vd->vdev_open_thread == curthread || 1222 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1223 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1224 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1225 vd->vdev_state == VDEV_STATE_OFFLINE); 1226 1227 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1228 vd->vdev_cant_read = B_FALSE; 1229 vd->vdev_cant_write = B_FALSE; 1230 vd->vdev_notrim = B_FALSE; 1231 vd->vdev_min_asize = vdev_get_min_asize(vd); 1232 1233 /* 1234 * If this vdev is not removed, check its fault status. If it's 1235 * faulted, bail out of the open. 1236 */ 1237 if (!vd->vdev_removed && vd->vdev_faulted) { 1238 ASSERT(vd->vdev_children == 0); 1239 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1240 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1241 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1242 vd->vdev_label_aux); 1243 return (SET_ERROR(ENXIO)); 1244 } else if (vd->vdev_offline) { 1245 ASSERT(vd->vdev_children == 0); 1246 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1247 return (SET_ERROR(ENXIO)); 1248 } 1249 1250 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, 1251 &logical_ashift, &physical_ashift); 1252 1253 /* 1254 * Reset the vdev_reopening flag so that we actually close 1255 * the vdev on error. 1256 */ 1257 vd->vdev_reopening = B_FALSE; 1258 if (zio_injection_enabled && error == 0) 1259 error = zio_handle_device_injection(vd, NULL, ENXIO); 1260 1261 if (error) { 1262 if (vd->vdev_removed && 1263 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1264 vd->vdev_removed = B_FALSE; 1265 1266 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1267 vd->vdev_stat.vs_aux); 1268 return (error); 1269 } 1270 1271 vd->vdev_removed = B_FALSE; 1272 1273 /* 1274 * Recheck the faulted flag now that we have confirmed that 1275 * the vdev is accessible. If we're faulted, bail. 1276 */ 1277 if (vd->vdev_faulted) { 1278 ASSERT(vd->vdev_children == 0); 1279 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1280 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1281 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1282 vd->vdev_label_aux); 1283 return (SET_ERROR(ENXIO)); 1284 } 1285 1286 if (vd->vdev_degraded) { 1287 ASSERT(vd->vdev_children == 0); 1288 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1289 VDEV_AUX_ERR_EXCEEDED); 1290 } else { 1291 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1292 } 1293 1294 /* 1295 * For hole or missing vdevs we just return success. 1296 */ 1297 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1298 return (0); 1299 1300 if (zfs_trim_enabled && !vd->vdev_notrim && vd->vdev_ops->vdev_op_leaf) 1301 trim_map_create(vd); 1302 1303 for (int c = 0; c < vd->vdev_children; c++) { 1304 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1305 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1306 VDEV_AUX_NONE); 1307 break; 1308 } 1309 } 1310 1311 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1312 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1313 1314 if (vd->vdev_children == 0) { 1315 if (osize < SPA_MINDEVSIZE) { 1316 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1317 VDEV_AUX_TOO_SMALL); 1318 return (SET_ERROR(EOVERFLOW)); 1319 } 1320 psize = osize; 1321 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1322 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1323 VDEV_LABEL_END_SIZE); 1324 } else { 1325 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1326 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1327 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1328 VDEV_AUX_TOO_SMALL); 1329 return (SET_ERROR(EOVERFLOW)); 1330 } 1331 psize = 0; 1332 asize = osize; 1333 max_asize = max_osize; 1334 } 1335 1336 vd->vdev_psize = psize; 1337 1338 /* 1339 * Make sure the allocatable size hasn't shrunk. 1340 */ 1341 if (asize < vd->vdev_min_asize) { 1342 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1343 VDEV_AUX_BAD_LABEL); 1344 return (SET_ERROR(EINVAL)); 1345 } 1346 1347 vd->vdev_physical_ashift = 1348 MAX(physical_ashift, vd->vdev_physical_ashift); 1349 vd->vdev_logical_ashift = MAX(logical_ashift, vd->vdev_logical_ashift); 1350 vd->vdev_ashift = MAX(vd->vdev_logical_ashift, vd->vdev_ashift); 1351 1352 if (vd->vdev_logical_ashift > SPA_MAXASHIFT) { 1353 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1354 VDEV_AUX_ASHIFT_TOO_BIG); 1355 return (EINVAL); 1356 } 1357 1358 if (vd->vdev_asize == 0) { 1359 /* 1360 * This is the first-ever open, so use the computed values. 1361 * For testing purposes, a higher ashift can be requested. 1362 */ 1363 vd->vdev_asize = asize; 1364 vd->vdev_max_asize = max_asize; 1365 } else { 1366 /* 1367 * Make sure the alignment requirement hasn't increased. 1368 */ 1369 if (vd->vdev_ashift > vd->vdev_top->vdev_ashift && 1370 vd->vdev_ops->vdev_op_leaf) { 1371 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1372 VDEV_AUX_BAD_LABEL); 1373 return (EINVAL); 1374 } 1375 vd->vdev_max_asize = max_asize; 1376 } 1377 1378 /* 1379 * If all children are healthy and the asize has increased, 1380 * then we've experienced dynamic LUN growth. If automatic 1381 * expansion is enabled then use the additional space. 1382 */ 1383 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1384 (vd->vdev_expanding || spa->spa_autoexpand)) 1385 vd->vdev_asize = asize; 1386 1387 vdev_set_min_asize(vd); 1388 1389 /* 1390 * Ensure we can issue some IO before declaring the 1391 * vdev open for business. 1392 */ 1393 if (vd->vdev_ops->vdev_op_leaf && 1394 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1395 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1396 VDEV_AUX_ERR_EXCEEDED); 1397 return (error); 1398 } 1399 1400 /* 1401 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1402 * resilver. But don't do this if we are doing a reopen for a scrub, 1403 * since this would just restart the scrub we are already doing. 1404 */ 1405 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1406 vdev_resilver_needed(vd, NULL, NULL)) 1407 spa_async_request(spa, SPA_ASYNC_RESILVER); 1408 1409 return (0); 1410} 1411 1412/* 1413 * Called once the vdevs are all opened, this routine validates the label 1414 * contents. This needs to be done before vdev_load() so that we don't 1415 * inadvertently do repair I/Os to the wrong device. 1416 * 1417 * If 'strict' is false ignore the spa guid check. This is necessary because 1418 * if the machine crashed during a re-guid the new guid might have been written 1419 * to all of the vdev labels, but not the cached config. The strict check 1420 * will be performed when the pool is opened again using the mos config. 1421 * 1422 * This function will only return failure if one of the vdevs indicates that it 1423 * has since been destroyed or exported. This is only possible if 1424 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1425 * will be updated but the function will return 0. 1426 */ 1427int 1428vdev_validate(vdev_t *vd, boolean_t strict) 1429{ 1430 spa_t *spa = vd->vdev_spa; 1431 nvlist_t *label; 1432 uint64_t guid = 0, top_guid; 1433 uint64_t state; 1434 1435 for (int c = 0; c < vd->vdev_children; c++) 1436 if (vdev_validate(vd->vdev_child[c], strict) != 0) 1437 return (SET_ERROR(EBADF)); 1438 1439 /* 1440 * If the device has already failed, or was marked offline, don't do 1441 * any further validation. Otherwise, label I/O will fail and we will 1442 * overwrite the previous state. 1443 */ 1444 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1445 uint64_t aux_guid = 0; 1446 nvlist_t *nvl; 1447 uint64_t txg = spa_last_synced_txg(spa) != 0 ? 1448 spa_last_synced_txg(spa) : -1ULL; 1449 1450 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1451 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1452 VDEV_AUX_BAD_LABEL); 1453 return (0); 1454 } 1455 1456 /* 1457 * Determine if this vdev has been split off into another 1458 * pool. If so, then refuse to open it. 1459 */ 1460 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1461 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1462 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1463 VDEV_AUX_SPLIT_POOL); 1464 nvlist_free(label); 1465 return (0); 1466 } 1467 1468 if (strict && (nvlist_lookup_uint64(label, 1469 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 || 1470 guid != spa_guid(spa))) { 1471 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1472 VDEV_AUX_CORRUPT_DATA); 1473 nvlist_free(label); 1474 return (0); 1475 } 1476 1477 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1478 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1479 &aux_guid) != 0) 1480 aux_guid = 0; 1481 1482 /* 1483 * If this vdev just became a top-level vdev because its 1484 * sibling was detached, it will have adopted the parent's 1485 * vdev guid -- but the label may or may not be on disk yet. 1486 * Fortunately, either version of the label will have the 1487 * same top guid, so if we're a top-level vdev, we can 1488 * safely compare to that instead. 1489 * 1490 * If we split this vdev off instead, then we also check the 1491 * original pool's guid. We don't want to consider the vdev 1492 * corrupt if it is partway through a split operation. 1493 */ 1494 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1495 &guid) != 0 || 1496 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1497 &top_guid) != 0 || 1498 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1499 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1500 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1501 VDEV_AUX_CORRUPT_DATA); 1502 nvlist_free(label); 1503 return (0); 1504 } 1505 1506 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1507 &state) != 0) { 1508 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1509 VDEV_AUX_CORRUPT_DATA); 1510 nvlist_free(label); 1511 return (0); 1512 } 1513 1514 nvlist_free(label); 1515 1516 /* 1517 * If this is a verbatim import, no need to check the 1518 * state of the pool. 1519 */ 1520 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1521 spa_load_state(spa) == SPA_LOAD_OPEN && 1522 state != POOL_STATE_ACTIVE) 1523 return (SET_ERROR(EBADF)); 1524 1525 /* 1526 * If we were able to open and validate a vdev that was 1527 * previously marked permanently unavailable, clear that state 1528 * now. 1529 */ 1530 if (vd->vdev_not_present) 1531 vd->vdev_not_present = 0; 1532 } 1533 1534 return (0); 1535} 1536 1537/* 1538 * Close a virtual device. 1539 */ 1540void 1541vdev_close(vdev_t *vd) 1542{ 1543 spa_t *spa = vd->vdev_spa; 1544 vdev_t *pvd = vd->vdev_parent; 1545 1546 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1547 1548 /* 1549 * If our parent is reopening, then we are as well, unless we are 1550 * going offline. 1551 */ 1552 if (pvd != NULL && pvd->vdev_reopening) 1553 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1554 1555 vd->vdev_ops->vdev_op_close(vd); 1556 1557 vdev_cache_purge(vd); 1558 1559 if (vd->vdev_ops->vdev_op_leaf) 1560 trim_map_destroy(vd); 1561 1562 /* 1563 * We record the previous state before we close it, so that if we are 1564 * doing a reopen(), we don't generate FMA ereports if we notice that 1565 * it's still faulted. 1566 */ 1567 vd->vdev_prevstate = vd->vdev_state; 1568 1569 if (vd->vdev_offline) 1570 vd->vdev_state = VDEV_STATE_OFFLINE; 1571 else 1572 vd->vdev_state = VDEV_STATE_CLOSED; 1573 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1574} 1575 1576void 1577vdev_hold(vdev_t *vd) 1578{ 1579 spa_t *spa = vd->vdev_spa; 1580 1581 ASSERT(spa_is_root(spa)); 1582 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1583 return; 1584 1585 for (int c = 0; c < vd->vdev_children; c++) 1586 vdev_hold(vd->vdev_child[c]); 1587 1588 if (vd->vdev_ops->vdev_op_leaf) 1589 vd->vdev_ops->vdev_op_hold(vd); 1590} 1591 1592void 1593vdev_rele(vdev_t *vd) 1594{ 1595 spa_t *spa = vd->vdev_spa; 1596 1597 ASSERT(spa_is_root(spa)); 1598 for (int c = 0; c < vd->vdev_children; c++) 1599 vdev_rele(vd->vdev_child[c]); 1600 1601 if (vd->vdev_ops->vdev_op_leaf) 1602 vd->vdev_ops->vdev_op_rele(vd); 1603} 1604 1605/* 1606 * Reopen all interior vdevs and any unopened leaves. We don't actually 1607 * reopen leaf vdevs which had previously been opened as they might deadlock 1608 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1609 * If the leaf has never been opened then open it, as usual. 1610 */ 1611void 1612vdev_reopen(vdev_t *vd) 1613{ 1614 spa_t *spa = vd->vdev_spa; 1615 1616 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1617 1618 /* set the reopening flag unless we're taking the vdev offline */ 1619 vd->vdev_reopening = !vd->vdev_offline; 1620 vdev_close(vd); 1621 (void) vdev_open(vd); 1622 1623 /* 1624 * Call vdev_validate() here to make sure we have the same device. 1625 * Otherwise, a device with an invalid label could be successfully 1626 * opened in response to vdev_reopen(). 1627 */ 1628 if (vd->vdev_aux) { 1629 (void) vdev_validate_aux(vd); 1630 if (vdev_readable(vd) && vdev_writeable(vd) && 1631 vd->vdev_aux == &spa->spa_l2cache && 1632 !l2arc_vdev_present(vd)) 1633 l2arc_add_vdev(spa, vd); 1634 } else { 1635 (void) vdev_validate(vd, B_TRUE); 1636 } 1637 1638 /* 1639 * Reassess parent vdev's health. 1640 */ 1641 vdev_propagate_state(vd); 1642} 1643 1644int 1645vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1646{ 1647 int error; 1648 1649 /* 1650 * Normally, partial opens (e.g. of a mirror) are allowed. 1651 * For a create, however, we want to fail the request if 1652 * there are any components we can't open. 1653 */ 1654 error = vdev_open(vd); 1655 1656 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1657 vdev_close(vd); 1658 return (error ? error : ENXIO); 1659 } 1660 1661 /* 1662 * Recursively load DTLs and initialize all labels. 1663 */ 1664 if ((error = vdev_dtl_load(vd)) != 0 || 1665 (error = vdev_label_init(vd, txg, isreplacing ? 1666 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1667 vdev_close(vd); 1668 return (error); 1669 } 1670 1671 return (0); 1672} 1673 1674void 1675vdev_metaslab_set_size(vdev_t *vd) 1676{ 1677 /* 1678 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev. 1679 */ 1680 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev); 1681 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1682} 1683 1684/* 1685 * Maximize performance by inflating the configured ashift for top level 1686 * vdevs to be as close to the physical ashift as possible while maintaining 1687 * administrator defined limits and ensuring it doesn't go below the 1688 * logical ashift. 1689 */ 1690void 1691vdev_ashift_optimize(vdev_t *vd) 1692{ 1693 if (vd == vd->vdev_top) { 1694 if (vd->vdev_ashift < vd->vdev_physical_ashift) { 1695 vd->vdev_ashift = MIN( 1696 MAX(zfs_max_auto_ashift, vd->vdev_ashift), 1697 MAX(zfs_min_auto_ashift, vd->vdev_physical_ashift)); 1698 } else { 1699 /* 1700 * Unusual case where logical ashift > physical ashift 1701 * so we can't cap the calculated ashift based on max 1702 * ashift as that would cause failures. 1703 * We still check if we need to increase it to match 1704 * the min ashift. 1705 */ 1706 vd->vdev_ashift = MAX(zfs_min_auto_ashift, 1707 vd->vdev_ashift); 1708 } 1709 } 1710} 1711 1712void 1713vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1714{ 1715 ASSERT(vd == vd->vdev_top); 1716 ASSERT(!vd->vdev_ishole); 1717 ASSERT(ISP2(flags)); 1718 ASSERT(spa_writeable(vd->vdev_spa)); 1719 1720 if (flags & VDD_METASLAB) 1721 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1722 1723 if (flags & VDD_DTL) 1724 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1725 1726 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1727} 1728 1729void 1730vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 1731{ 1732 for (int c = 0; c < vd->vdev_children; c++) 1733 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 1734 1735 if (vd->vdev_ops->vdev_op_leaf) 1736 vdev_dirty(vd->vdev_top, flags, vd, txg); 1737} 1738 1739/* 1740 * DTLs. 1741 * 1742 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1743 * the vdev has less than perfect replication. There are four kinds of DTL: 1744 * 1745 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1746 * 1747 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1748 * 1749 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1750 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1751 * txgs that was scrubbed. 1752 * 1753 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1754 * persistent errors or just some device being offline. 1755 * Unlike the other three, the DTL_OUTAGE map is not generally 1756 * maintained; it's only computed when needed, typically to 1757 * determine whether a device can be detached. 1758 * 1759 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1760 * either has the data or it doesn't. 1761 * 1762 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1763 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1764 * if any child is less than fully replicated, then so is its parent. 1765 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1766 * comprising only those txgs which appear in 'maxfaults' or more children; 1767 * those are the txgs we don't have enough replication to read. For example, 1768 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1769 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1770 * two child DTL_MISSING maps. 1771 * 1772 * It should be clear from the above that to compute the DTLs and outage maps 1773 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1774 * Therefore, that is all we keep on disk. When loading the pool, or after 1775 * a configuration change, we generate all other DTLs from first principles. 1776 */ 1777void 1778vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1779{ 1780 range_tree_t *rt = vd->vdev_dtl[t]; 1781 1782 ASSERT(t < DTL_TYPES); 1783 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1784 ASSERT(spa_writeable(vd->vdev_spa)); 1785 1786 mutex_enter(rt->rt_lock); 1787 if (!range_tree_contains(rt, txg, size)) 1788 range_tree_add(rt, txg, size); 1789 mutex_exit(rt->rt_lock); 1790} 1791 1792boolean_t 1793vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1794{ 1795 range_tree_t *rt = vd->vdev_dtl[t]; 1796 boolean_t dirty = B_FALSE; 1797 1798 ASSERT(t < DTL_TYPES); 1799 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1800 1801 mutex_enter(rt->rt_lock); 1802 if (range_tree_space(rt) != 0) 1803 dirty = range_tree_contains(rt, txg, size); 1804 mutex_exit(rt->rt_lock); 1805 1806 return (dirty); 1807} 1808 1809boolean_t 1810vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1811{ 1812 range_tree_t *rt = vd->vdev_dtl[t]; 1813 boolean_t empty; 1814 1815 mutex_enter(rt->rt_lock); 1816 empty = (range_tree_space(rt) == 0); 1817 mutex_exit(rt->rt_lock); 1818 1819 return (empty); 1820} 1821 1822/* 1823 * Returns the lowest txg in the DTL range. 1824 */ 1825static uint64_t 1826vdev_dtl_min(vdev_t *vd) 1827{ 1828 range_seg_t *rs; 1829 1830 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1831 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1832 ASSERT0(vd->vdev_children); 1833 1834 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1835 return (rs->rs_start - 1); 1836} 1837 1838/* 1839 * Returns the highest txg in the DTL. 1840 */ 1841static uint64_t 1842vdev_dtl_max(vdev_t *vd) 1843{ 1844 range_seg_t *rs; 1845 1846 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1847 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1848 ASSERT0(vd->vdev_children); 1849 1850 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1851 return (rs->rs_end); 1852} 1853 1854/* 1855 * Determine if a resilvering vdev should remove any DTL entries from 1856 * its range. If the vdev was resilvering for the entire duration of the 1857 * scan then it should excise that range from its DTLs. Otherwise, this 1858 * vdev is considered partially resilvered and should leave its DTL 1859 * entries intact. The comment in vdev_dtl_reassess() describes how we 1860 * excise the DTLs. 1861 */ 1862static boolean_t 1863vdev_dtl_should_excise(vdev_t *vd) 1864{ 1865 spa_t *spa = vd->vdev_spa; 1866 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1867 1868 ASSERT0(scn->scn_phys.scn_errors); 1869 ASSERT0(vd->vdev_children); 1870 1871 if (vd->vdev_resilver_txg == 0 || 1872 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0) 1873 return (B_TRUE); 1874 1875 /* 1876 * When a resilver is initiated the scan will assign the scn_max_txg 1877 * value to the highest txg value that exists in all DTLs. If this 1878 * device's max DTL is not part of this scan (i.e. it is not in 1879 * the range (scn_min_txg, scn_max_txg] then it is not eligible 1880 * for excision. 1881 */ 1882 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 1883 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 1884 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 1885 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 1886 return (B_TRUE); 1887 } 1888 return (B_FALSE); 1889} 1890 1891/* 1892 * Reassess DTLs after a config change or scrub completion. 1893 */ 1894void 1895vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1896{ 1897 spa_t *spa = vd->vdev_spa; 1898 avl_tree_t reftree; 1899 int minref; 1900 1901 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1902 1903 for (int c = 0; c < vd->vdev_children; c++) 1904 vdev_dtl_reassess(vd->vdev_child[c], txg, 1905 scrub_txg, scrub_done); 1906 1907 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1908 return; 1909 1910 if (vd->vdev_ops->vdev_op_leaf) { 1911 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1912 1913 mutex_enter(&vd->vdev_dtl_lock); 1914 1915 /* 1916 * If we've completed a scan cleanly then determine 1917 * if this vdev should remove any DTLs. We only want to 1918 * excise regions on vdevs that were available during 1919 * the entire duration of this scan. 1920 */ 1921 if (scrub_txg != 0 && 1922 (spa->spa_scrub_started || 1923 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 1924 vdev_dtl_should_excise(vd)) { 1925 /* 1926 * We completed a scrub up to scrub_txg. If we 1927 * did it without rebooting, then the scrub dtl 1928 * will be valid, so excise the old region and 1929 * fold in the scrub dtl. Otherwise, leave the 1930 * dtl as-is if there was an error. 1931 * 1932 * There's little trick here: to excise the beginning 1933 * of the DTL_MISSING map, we put it into a reference 1934 * tree and then add a segment with refcnt -1 that 1935 * covers the range [0, scrub_txg). This means 1936 * that each txg in that range has refcnt -1 or 0. 1937 * We then add DTL_SCRUB with a refcnt of 2, so that 1938 * entries in the range [0, scrub_txg) will have a 1939 * positive refcnt -- either 1 or 2. We then convert 1940 * the reference tree into the new DTL_MISSING map. 1941 */ 1942 space_reftree_create(&reftree); 1943 space_reftree_add_map(&reftree, 1944 vd->vdev_dtl[DTL_MISSING], 1); 1945 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 1946 space_reftree_add_map(&reftree, 1947 vd->vdev_dtl[DTL_SCRUB], 2); 1948 space_reftree_generate_map(&reftree, 1949 vd->vdev_dtl[DTL_MISSING], 1); 1950 space_reftree_destroy(&reftree); 1951 } 1952 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1953 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1954 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 1955 if (scrub_done) 1956 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1957 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1958 if (!vdev_readable(vd)) 1959 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1960 else 1961 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1962 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 1963 1964 /* 1965 * If the vdev was resilvering and no longer has any 1966 * DTLs then reset its resilvering flag and dirty 1967 * the top level so that we persist the change. 1968 */ 1969 if (vd->vdev_resilver_txg != 0 && 1970 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 && 1971 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0) { 1972 vd->vdev_resilver_txg = 0; 1973 vdev_config_dirty(vd->vdev_top); 1974 } 1975 1976 mutex_exit(&vd->vdev_dtl_lock); 1977 1978 if (txg != 0) 1979 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 1980 return; 1981 } 1982 1983 mutex_enter(&vd->vdev_dtl_lock); 1984 for (int t = 0; t < DTL_TYPES; t++) { 1985 /* account for child's outage in parent's missing map */ 1986 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 1987 if (t == DTL_SCRUB) 1988 continue; /* leaf vdevs only */ 1989 if (t == DTL_PARTIAL) 1990 minref = 1; /* i.e. non-zero */ 1991 else if (vd->vdev_nparity != 0) 1992 minref = vd->vdev_nparity + 1; /* RAID-Z */ 1993 else 1994 minref = vd->vdev_children; /* any kind of mirror */ 1995 space_reftree_create(&reftree); 1996 for (int c = 0; c < vd->vdev_children; c++) { 1997 vdev_t *cvd = vd->vdev_child[c]; 1998 mutex_enter(&cvd->vdev_dtl_lock); 1999 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 2000 mutex_exit(&cvd->vdev_dtl_lock); 2001 } 2002 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2003 space_reftree_destroy(&reftree); 2004 } 2005 mutex_exit(&vd->vdev_dtl_lock); 2006} 2007 2008int 2009vdev_dtl_load(vdev_t *vd) 2010{ 2011 spa_t *spa = vd->vdev_spa; 2012 objset_t *mos = spa->spa_meta_objset; 2013 int error = 0; 2014 2015 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2016 ASSERT(!vd->vdev_ishole); 2017 2018 error = space_map_open(&vd->vdev_dtl_sm, mos, 2019 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock); 2020 if (error) 2021 return (error); 2022 ASSERT(vd->vdev_dtl_sm != NULL); 2023 2024 mutex_enter(&vd->vdev_dtl_lock); 2025 2026 /* 2027 * Now that we've opened the space_map we need to update 2028 * the in-core DTL. 2029 */ 2030 space_map_update(vd->vdev_dtl_sm); 2031 2032 error = space_map_load(vd->vdev_dtl_sm, 2033 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2034 mutex_exit(&vd->vdev_dtl_lock); 2035 2036 return (error); 2037 } 2038 2039 for (int c = 0; c < vd->vdev_children; c++) { 2040 error = vdev_dtl_load(vd->vdev_child[c]); 2041 if (error != 0) 2042 break; 2043 } 2044 2045 return (error); 2046} 2047 2048void 2049vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2050{ 2051 spa_t *spa = vd->vdev_spa; 2052 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2053 objset_t *mos = spa->spa_meta_objset; 2054 range_tree_t *rtsync; 2055 kmutex_t rtlock; 2056 dmu_tx_t *tx; 2057 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2058 2059 ASSERT(!vd->vdev_ishole); 2060 ASSERT(vd->vdev_ops->vdev_op_leaf); 2061 2062 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2063 2064 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2065 mutex_enter(&vd->vdev_dtl_lock); 2066 space_map_free(vd->vdev_dtl_sm, tx); 2067 space_map_close(vd->vdev_dtl_sm); 2068 vd->vdev_dtl_sm = NULL; 2069 mutex_exit(&vd->vdev_dtl_lock); 2070 dmu_tx_commit(tx); 2071 return; 2072 } 2073 2074 if (vd->vdev_dtl_sm == NULL) { 2075 uint64_t new_object; 2076 2077 new_object = space_map_alloc(mos, tx); 2078 VERIFY3U(new_object, !=, 0); 2079 2080 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2081 0, -1ULL, 0, &vd->vdev_dtl_lock)); 2082 ASSERT(vd->vdev_dtl_sm != NULL); 2083 } 2084 2085 bzero(&rtlock, sizeof(rtlock)); 2086 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL); 2087 2088 rtsync = range_tree_create(NULL, NULL, &rtlock); 2089 2090 mutex_enter(&rtlock); 2091 2092 mutex_enter(&vd->vdev_dtl_lock); 2093 range_tree_walk(rt, range_tree_add, rtsync); 2094 mutex_exit(&vd->vdev_dtl_lock); 2095 2096 space_map_truncate(vd->vdev_dtl_sm, tx); 2097 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx); 2098 range_tree_vacate(rtsync, NULL, NULL); 2099 2100 range_tree_destroy(rtsync); 2101 2102 mutex_exit(&rtlock); 2103 mutex_destroy(&rtlock); 2104 2105 /* 2106 * If the object for the space map has changed then dirty 2107 * the top level so that we update the config. 2108 */ 2109 if (object != space_map_object(vd->vdev_dtl_sm)) { 2110 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, " 2111 "new object %llu", txg, spa_name(spa), object, 2112 space_map_object(vd->vdev_dtl_sm)); 2113 vdev_config_dirty(vd->vdev_top); 2114 } 2115 2116 dmu_tx_commit(tx); 2117 2118 mutex_enter(&vd->vdev_dtl_lock); 2119 space_map_update(vd->vdev_dtl_sm); 2120 mutex_exit(&vd->vdev_dtl_lock); 2121} 2122 2123/* 2124 * Determine whether the specified vdev can be offlined/detached/removed 2125 * without losing data. 2126 */ 2127boolean_t 2128vdev_dtl_required(vdev_t *vd) 2129{ 2130 spa_t *spa = vd->vdev_spa; 2131 vdev_t *tvd = vd->vdev_top; 2132 uint8_t cant_read = vd->vdev_cant_read; 2133 boolean_t required; 2134 2135 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2136 2137 if (vd == spa->spa_root_vdev || vd == tvd) 2138 return (B_TRUE); 2139 2140 /* 2141 * Temporarily mark the device as unreadable, and then determine 2142 * whether this results in any DTL outages in the top-level vdev. 2143 * If not, we can safely offline/detach/remove the device. 2144 */ 2145 vd->vdev_cant_read = B_TRUE; 2146 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2147 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2148 vd->vdev_cant_read = cant_read; 2149 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2150 2151 if (!required && zio_injection_enabled) 2152 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2153 2154 return (required); 2155} 2156 2157/* 2158 * Determine if resilver is needed, and if so the txg range. 2159 */ 2160boolean_t 2161vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2162{ 2163 boolean_t needed = B_FALSE; 2164 uint64_t thismin = UINT64_MAX; 2165 uint64_t thismax = 0; 2166 2167 if (vd->vdev_children == 0) { 2168 mutex_enter(&vd->vdev_dtl_lock); 2169 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 && 2170 vdev_writeable(vd)) { 2171 2172 thismin = vdev_dtl_min(vd); 2173 thismax = vdev_dtl_max(vd); 2174 needed = B_TRUE; 2175 } 2176 mutex_exit(&vd->vdev_dtl_lock); 2177 } else { 2178 for (int c = 0; c < vd->vdev_children; c++) { 2179 vdev_t *cvd = vd->vdev_child[c]; 2180 uint64_t cmin, cmax; 2181 2182 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2183 thismin = MIN(thismin, cmin); 2184 thismax = MAX(thismax, cmax); 2185 needed = B_TRUE; 2186 } 2187 } 2188 } 2189 2190 if (needed && minp) { 2191 *minp = thismin; 2192 *maxp = thismax; 2193 } 2194 return (needed); 2195} 2196 2197void 2198vdev_load(vdev_t *vd) 2199{ 2200 /* 2201 * Recursively load all children. 2202 */ 2203 for (int c = 0; c < vd->vdev_children; c++) 2204 vdev_load(vd->vdev_child[c]); 2205 2206 /* 2207 * If this is a top-level vdev, initialize its metaslabs. 2208 */ 2209 if (vd == vd->vdev_top && !vd->vdev_ishole && 2210 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 2211 vdev_metaslab_init(vd, 0) != 0)) 2212 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2213 VDEV_AUX_CORRUPT_DATA); 2214 2215 /* 2216 * If this is a leaf vdev, load its DTL. 2217 */ 2218 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 2219 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2220 VDEV_AUX_CORRUPT_DATA); 2221} 2222 2223/* 2224 * The special vdev case is used for hot spares and l2cache devices. Its 2225 * sole purpose it to set the vdev state for the associated vdev. To do this, 2226 * we make sure that we can open the underlying device, then try to read the 2227 * label, and make sure that the label is sane and that it hasn't been 2228 * repurposed to another pool. 2229 */ 2230int 2231vdev_validate_aux(vdev_t *vd) 2232{ 2233 nvlist_t *label; 2234 uint64_t guid, version; 2235 uint64_t state; 2236 2237 if (!vdev_readable(vd)) 2238 return (0); 2239 2240 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2241 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2242 VDEV_AUX_CORRUPT_DATA); 2243 return (-1); 2244 } 2245 2246 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2247 !SPA_VERSION_IS_SUPPORTED(version) || 2248 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2249 guid != vd->vdev_guid || 2250 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2251 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2252 VDEV_AUX_CORRUPT_DATA); 2253 nvlist_free(label); 2254 return (-1); 2255 } 2256 2257 /* 2258 * We don't actually check the pool state here. If it's in fact in 2259 * use by another pool, we update this fact on the fly when requested. 2260 */ 2261 nvlist_free(label); 2262 return (0); 2263} 2264 2265void 2266vdev_remove(vdev_t *vd, uint64_t txg) 2267{ 2268 spa_t *spa = vd->vdev_spa; 2269 objset_t *mos = spa->spa_meta_objset; 2270 dmu_tx_t *tx; 2271 2272 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2273 2274 if (vd->vdev_ms != NULL) { 2275 metaslab_group_t *mg = vd->vdev_mg; 2276 2277 metaslab_group_histogram_verify(mg); 2278 metaslab_class_histogram_verify(mg->mg_class); 2279 2280 for (int m = 0; m < vd->vdev_ms_count; m++) { 2281 metaslab_t *msp = vd->vdev_ms[m]; 2282 2283 if (msp == NULL || msp->ms_sm == NULL) 2284 continue; 2285 2286 mutex_enter(&msp->ms_lock); 2287 /* 2288 * If the metaslab was not loaded when the vdev 2289 * was removed then the histogram accounting may 2290 * not be accurate. Update the histogram information 2291 * here so that we ensure that the metaslab group 2292 * and metaslab class are up-to-date. 2293 */ 2294 metaslab_group_histogram_remove(mg, msp); 2295 2296 VERIFY0(space_map_allocated(msp->ms_sm)); 2297 space_map_free(msp->ms_sm, tx); 2298 space_map_close(msp->ms_sm); 2299 msp->ms_sm = NULL; 2300 mutex_exit(&msp->ms_lock); 2301 } 2302 2303 metaslab_group_histogram_verify(mg); 2304 metaslab_class_histogram_verify(mg->mg_class); 2305 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 2306 ASSERT0(mg->mg_histogram[i]); 2307 2308 } 2309 2310 if (vd->vdev_ms_array) { 2311 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2312 vd->vdev_ms_array = 0; 2313 } 2314 dmu_tx_commit(tx); 2315} 2316 2317void 2318vdev_sync_done(vdev_t *vd, uint64_t txg) 2319{ 2320 metaslab_t *msp; 2321 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2322 2323 ASSERT(!vd->vdev_ishole); 2324 2325 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2326 metaslab_sync_done(msp, txg); 2327 2328 if (reassess) 2329 metaslab_sync_reassess(vd->vdev_mg); 2330} 2331 2332void 2333vdev_sync(vdev_t *vd, uint64_t txg) 2334{ 2335 spa_t *spa = vd->vdev_spa; 2336 vdev_t *lvd; 2337 metaslab_t *msp; 2338 dmu_tx_t *tx; 2339 2340 ASSERT(!vd->vdev_ishole); 2341 2342 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2343 ASSERT(vd == vd->vdev_top); 2344 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2345 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2346 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2347 ASSERT(vd->vdev_ms_array != 0); 2348 vdev_config_dirty(vd); 2349 dmu_tx_commit(tx); 2350 } 2351 2352 /* 2353 * Remove the metadata associated with this vdev once it's empty. 2354 */ 2355 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2356 vdev_remove(vd, txg); 2357 2358 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2359 metaslab_sync(msp, txg); 2360 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2361 } 2362 2363 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2364 vdev_dtl_sync(lvd, txg); 2365 2366 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2367} 2368 2369uint64_t 2370vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2371{ 2372 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2373} 2374 2375/* 2376 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2377 * not be opened, and no I/O is attempted. 2378 */ 2379int 2380vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2381{ 2382 vdev_t *vd, *tvd; 2383 2384 spa_vdev_state_enter(spa, SCL_NONE); 2385 2386 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2387 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2388 2389 if (!vd->vdev_ops->vdev_op_leaf) 2390 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2391 2392 tvd = vd->vdev_top; 2393 2394 /* 2395 * We don't directly use the aux state here, but if we do a 2396 * vdev_reopen(), we need this value to be present to remember why we 2397 * were faulted. 2398 */ 2399 vd->vdev_label_aux = aux; 2400 2401 /* 2402 * Faulted state takes precedence over degraded. 2403 */ 2404 vd->vdev_delayed_close = B_FALSE; 2405 vd->vdev_faulted = 1ULL; 2406 vd->vdev_degraded = 0ULL; 2407 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2408 2409 /* 2410 * If this device has the only valid copy of the data, then 2411 * back off and simply mark the vdev as degraded instead. 2412 */ 2413 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2414 vd->vdev_degraded = 1ULL; 2415 vd->vdev_faulted = 0ULL; 2416 2417 /* 2418 * If we reopen the device and it's not dead, only then do we 2419 * mark it degraded. 2420 */ 2421 vdev_reopen(tvd); 2422 2423 if (vdev_readable(vd)) 2424 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2425 } 2426 2427 return (spa_vdev_state_exit(spa, vd, 0)); 2428} 2429 2430/* 2431 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2432 * user that something is wrong. The vdev continues to operate as normal as far 2433 * as I/O is concerned. 2434 */ 2435int 2436vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2437{ 2438 vdev_t *vd; 2439 2440 spa_vdev_state_enter(spa, SCL_NONE); 2441 2442 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2443 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2444 2445 if (!vd->vdev_ops->vdev_op_leaf) 2446 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2447 2448 /* 2449 * If the vdev is already faulted, then don't do anything. 2450 */ 2451 if (vd->vdev_faulted || vd->vdev_degraded) 2452 return (spa_vdev_state_exit(spa, NULL, 0)); 2453 2454 vd->vdev_degraded = 1ULL; 2455 if (!vdev_is_dead(vd)) 2456 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2457 aux); 2458 2459 return (spa_vdev_state_exit(spa, vd, 0)); 2460} 2461 2462/* 2463 * Online the given vdev. 2464 * 2465 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 2466 * spare device should be detached when the device finishes resilvering. 2467 * Second, the online should be treated like a 'test' online case, so no FMA 2468 * events are generated if the device fails to open. 2469 */ 2470int 2471vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2472{ 2473 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2474 2475 spa_vdev_state_enter(spa, SCL_NONE); 2476 2477 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2478 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2479 2480 if (!vd->vdev_ops->vdev_op_leaf) 2481 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2482 2483 tvd = vd->vdev_top; 2484 vd->vdev_offline = B_FALSE; 2485 vd->vdev_tmpoffline = B_FALSE; 2486 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2487 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2488 2489 /* XXX - L2ARC 1.0 does not support expansion */ 2490 if (!vd->vdev_aux) { 2491 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2492 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2493 } 2494 2495 vdev_reopen(tvd); 2496 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2497 2498 if (!vd->vdev_aux) { 2499 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2500 pvd->vdev_expanding = B_FALSE; 2501 } 2502 2503 if (newstate) 2504 *newstate = vd->vdev_state; 2505 if ((flags & ZFS_ONLINE_UNSPARE) && 2506 !vdev_is_dead(vd) && vd->vdev_parent && 2507 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2508 vd->vdev_parent->vdev_child[0] == vd) 2509 vd->vdev_unspare = B_TRUE; 2510 2511 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2512 2513 /* XXX - L2ARC 1.0 does not support expansion */ 2514 if (vd->vdev_aux) 2515 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2516 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2517 } 2518 return (spa_vdev_state_exit(spa, vd, 0)); 2519} 2520 2521static int 2522vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2523{ 2524 vdev_t *vd, *tvd; 2525 int error = 0; 2526 uint64_t generation; 2527 metaslab_group_t *mg; 2528 2529top: 2530 spa_vdev_state_enter(spa, SCL_ALLOC); 2531 2532 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2533 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2534 2535 if (!vd->vdev_ops->vdev_op_leaf) 2536 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2537 2538 tvd = vd->vdev_top; 2539 mg = tvd->vdev_mg; 2540 generation = spa->spa_config_generation + 1; 2541 2542 /* 2543 * If the device isn't already offline, try to offline it. 2544 */ 2545 if (!vd->vdev_offline) { 2546 /* 2547 * If this device has the only valid copy of some data, 2548 * don't allow it to be offlined. Log devices are always 2549 * expendable. 2550 */ 2551 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2552 vdev_dtl_required(vd)) 2553 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2554 2555 /* 2556 * If the top-level is a slog and it has had allocations 2557 * then proceed. We check that the vdev's metaslab group 2558 * is not NULL since it's possible that we may have just 2559 * added this vdev but not yet initialized its metaslabs. 2560 */ 2561 if (tvd->vdev_islog && mg != NULL) { 2562 /* 2563 * Prevent any future allocations. 2564 */ 2565 metaslab_group_passivate(mg); 2566 (void) spa_vdev_state_exit(spa, vd, 0); 2567 2568 error = spa_offline_log(spa); 2569 2570 spa_vdev_state_enter(spa, SCL_ALLOC); 2571 2572 /* 2573 * Check to see if the config has changed. 2574 */ 2575 if (error || generation != spa->spa_config_generation) { 2576 metaslab_group_activate(mg); 2577 if (error) 2578 return (spa_vdev_state_exit(spa, 2579 vd, error)); 2580 (void) spa_vdev_state_exit(spa, vd, 0); 2581 goto top; 2582 } 2583 ASSERT0(tvd->vdev_stat.vs_alloc); 2584 } 2585 2586 /* 2587 * Offline this device and reopen its top-level vdev. 2588 * If the top-level vdev is a log device then just offline 2589 * it. Otherwise, if this action results in the top-level 2590 * vdev becoming unusable, undo it and fail the request. 2591 */ 2592 vd->vdev_offline = B_TRUE; 2593 vdev_reopen(tvd); 2594 2595 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2596 vdev_is_dead(tvd)) { 2597 vd->vdev_offline = B_FALSE; 2598 vdev_reopen(tvd); 2599 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2600 } 2601 2602 /* 2603 * Add the device back into the metaslab rotor so that 2604 * once we online the device it's open for business. 2605 */ 2606 if (tvd->vdev_islog && mg != NULL) 2607 metaslab_group_activate(mg); 2608 } 2609 2610 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2611 2612 return (spa_vdev_state_exit(spa, vd, 0)); 2613} 2614 2615int 2616vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2617{ 2618 int error; 2619 2620 mutex_enter(&spa->spa_vdev_top_lock); 2621 error = vdev_offline_locked(spa, guid, flags); 2622 mutex_exit(&spa->spa_vdev_top_lock); 2623 2624 return (error); 2625} 2626 2627/* 2628 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2629 * vdev_offline(), we assume the spa config is locked. We also clear all 2630 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2631 */ 2632void 2633vdev_clear(spa_t *spa, vdev_t *vd) 2634{ 2635 vdev_t *rvd = spa->spa_root_vdev; 2636 2637 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2638 2639 if (vd == NULL) 2640 vd = rvd; 2641 2642 vd->vdev_stat.vs_read_errors = 0; 2643 vd->vdev_stat.vs_write_errors = 0; 2644 vd->vdev_stat.vs_checksum_errors = 0; 2645 2646 for (int c = 0; c < vd->vdev_children; c++) 2647 vdev_clear(spa, vd->vdev_child[c]); 2648 2649 if (vd == rvd) { 2650 for (int c = 0; c < spa->spa_l2cache.sav_count; c++) 2651 vdev_clear(spa, spa->spa_l2cache.sav_vdevs[c]); 2652 2653 for (int c = 0; c < spa->spa_spares.sav_count; c++) 2654 vdev_clear(spa, spa->spa_spares.sav_vdevs[c]); 2655 } 2656 2657 /* 2658 * If we're in the FAULTED state or have experienced failed I/O, then 2659 * clear the persistent state and attempt to reopen the device. We 2660 * also mark the vdev config dirty, so that the new faulted state is 2661 * written out to disk. 2662 */ 2663 if (vd->vdev_faulted || vd->vdev_degraded || 2664 !vdev_readable(vd) || !vdev_writeable(vd)) { 2665 2666 /* 2667 * When reopening in reponse to a clear event, it may be due to 2668 * a fmadm repair request. In this case, if the device is 2669 * still broken, we want to still post the ereport again. 2670 */ 2671 vd->vdev_forcefault = B_TRUE; 2672 2673 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2674 vd->vdev_cant_read = B_FALSE; 2675 vd->vdev_cant_write = B_FALSE; 2676 2677 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2678 2679 vd->vdev_forcefault = B_FALSE; 2680 2681 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2682 vdev_state_dirty(vd->vdev_top); 2683 2684 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2685 spa_async_request(spa, SPA_ASYNC_RESILVER); 2686 2687 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2688 } 2689 2690 /* 2691 * When clearing a FMA-diagnosed fault, we always want to 2692 * unspare the device, as we assume that the original spare was 2693 * done in response to the FMA fault. 2694 */ 2695 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2696 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2697 vd->vdev_parent->vdev_child[0] == vd) 2698 vd->vdev_unspare = B_TRUE; 2699} 2700 2701boolean_t 2702vdev_is_dead(vdev_t *vd) 2703{ 2704 /* 2705 * Holes and missing devices are always considered "dead". 2706 * This simplifies the code since we don't have to check for 2707 * these types of devices in the various code paths. 2708 * Instead we rely on the fact that we skip over dead devices 2709 * before issuing I/O to them. 2710 */ 2711 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2712 vd->vdev_ops == &vdev_missing_ops); 2713} 2714 2715boolean_t 2716vdev_readable(vdev_t *vd) 2717{ 2718 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2719} 2720 2721boolean_t 2722vdev_writeable(vdev_t *vd) 2723{ 2724 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2725} 2726 2727boolean_t 2728vdev_allocatable(vdev_t *vd) 2729{ 2730 uint64_t state = vd->vdev_state; 2731 2732 /* 2733 * We currently allow allocations from vdevs which may be in the 2734 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2735 * fails to reopen then we'll catch it later when we're holding 2736 * the proper locks. Note that we have to get the vdev state 2737 * in a local variable because although it changes atomically, 2738 * we're asking two separate questions about it. 2739 */ 2740 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2741 !vd->vdev_cant_write && !vd->vdev_ishole); 2742} 2743 2744boolean_t 2745vdev_accessible(vdev_t *vd, zio_t *zio) 2746{ 2747 ASSERT(zio->io_vd == vd); 2748 2749 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2750 return (B_FALSE); 2751 2752 if (zio->io_type == ZIO_TYPE_READ) 2753 return (!vd->vdev_cant_read); 2754 2755 if (zio->io_type == ZIO_TYPE_WRITE) 2756 return (!vd->vdev_cant_write); 2757 2758 return (B_TRUE); 2759} 2760 2761/* 2762 * Get statistics for the given vdev. 2763 */ 2764void 2765vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2766{ 2767 spa_t *spa = vd->vdev_spa; 2768 vdev_t *rvd = spa->spa_root_vdev; 2769 2770 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2771 2772 mutex_enter(&vd->vdev_stat_lock); 2773 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2774 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2775 vs->vs_state = vd->vdev_state; 2776 vs->vs_rsize = vdev_get_min_asize(vd); 2777 if (vd->vdev_ops->vdev_op_leaf) 2778 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2779 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize; 2780 vs->vs_configured_ashift = vd->vdev_top != NULL 2781 ? vd->vdev_top->vdev_ashift : vd->vdev_ashift; 2782 vs->vs_logical_ashift = vd->vdev_logical_ashift; 2783 vs->vs_physical_ashift = vd->vdev_physical_ashift; 2784 if (vd->vdev_aux == NULL && vd == vd->vdev_top && !vd->vdev_ishole) { 2785 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation; 2786 } 2787 2788 /* 2789 * If we're getting stats on the root vdev, aggregate the I/O counts 2790 * over all top-level vdevs (i.e. the direct children of the root). 2791 */ 2792 if (vd == rvd) { 2793 for (int c = 0; c < rvd->vdev_children; c++) { 2794 vdev_t *cvd = rvd->vdev_child[c]; 2795 vdev_stat_t *cvs = &cvd->vdev_stat; 2796 2797 for (int t = 0; t < ZIO_TYPES; t++) { 2798 vs->vs_ops[t] += cvs->vs_ops[t]; 2799 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2800 } 2801 cvs->vs_scan_removing = cvd->vdev_removing; 2802 } 2803 } 2804 mutex_exit(&vd->vdev_stat_lock); 2805} 2806 2807void 2808vdev_clear_stats(vdev_t *vd) 2809{ 2810 mutex_enter(&vd->vdev_stat_lock); 2811 vd->vdev_stat.vs_space = 0; 2812 vd->vdev_stat.vs_dspace = 0; 2813 vd->vdev_stat.vs_alloc = 0; 2814 mutex_exit(&vd->vdev_stat_lock); 2815} 2816 2817void 2818vdev_scan_stat_init(vdev_t *vd) 2819{ 2820 vdev_stat_t *vs = &vd->vdev_stat; 2821 2822 for (int c = 0; c < vd->vdev_children; c++) 2823 vdev_scan_stat_init(vd->vdev_child[c]); 2824 2825 mutex_enter(&vd->vdev_stat_lock); 2826 vs->vs_scan_processed = 0; 2827 mutex_exit(&vd->vdev_stat_lock); 2828} 2829 2830void 2831vdev_stat_update(zio_t *zio, uint64_t psize) 2832{ 2833 spa_t *spa = zio->io_spa; 2834 vdev_t *rvd = spa->spa_root_vdev; 2835 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2836 vdev_t *pvd; 2837 uint64_t txg = zio->io_txg; 2838 vdev_stat_t *vs = &vd->vdev_stat; 2839 zio_type_t type = zio->io_type; 2840 int flags = zio->io_flags; 2841 2842 /* 2843 * If this i/o is a gang leader, it didn't do any actual work. 2844 */ 2845 if (zio->io_gang_tree) 2846 return; 2847 2848 if (zio->io_error == 0) { 2849 /* 2850 * If this is a root i/o, don't count it -- we've already 2851 * counted the top-level vdevs, and vdev_get_stats() will 2852 * aggregate them when asked. This reduces contention on 2853 * the root vdev_stat_lock and implicitly handles blocks 2854 * that compress away to holes, for which there is no i/o. 2855 * (Holes never create vdev children, so all the counters 2856 * remain zero, which is what we want.) 2857 * 2858 * Note: this only applies to successful i/o (io_error == 0) 2859 * because unlike i/o counts, errors are not additive. 2860 * When reading a ditto block, for example, failure of 2861 * one top-level vdev does not imply a root-level error. 2862 */ 2863 if (vd == rvd) 2864 return; 2865 2866 ASSERT(vd == zio->io_vd); 2867 2868 if (flags & ZIO_FLAG_IO_BYPASS) 2869 return; 2870 2871 mutex_enter(&vd->vdev_stat_lock); 2872 2873 if (flags & ZIO_FLAG_IO_REPAIR) { 2874 if (flags & ZIO_FLAG_SCAN_THREAD) { 2875 dsl_scan_phys_t *scn_phys = 2876 &spa->spa_dsl_pool->dp_scan->scn_phys; 2877 uint64_t *processed = &scn_phys->scn_processed; 2878 2879 /* XXX cleanup? */ 2880 if (vd->vdev_ops->vdev_op_leaf) 2881 atomic_add_64(processed, psize); 2882 vs->vs_scan_processed += psize; 2883 } 2884 2885 if (flags & ZIO_FLAG_SELF_HEAL) 2886 vs->vs_self_healed += psize; 2887 } 2888 2889 vs->vs_ops[type]++; 2890 vs->vs_bytes[type] += psize; 2891 2892 mutex_exit(&vd->vdev_stat_lock); 2893 return; 2894 } 2895 2896 if (flags & ZIO_FLAG_SPECULATIVE) 2897 return; 2898 2899 /* 2900 * If this is an I/O error that is going to be retried, then ignore the 2901 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2902 * hard errors, when in reality they can happen for any number of 2903 * innocuous reasons (bus resets, MPxIO link failure, etc). 2904 */ 2905 if (zio->io_error == EIO && 2906 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2907 return; 2908 2909 /* 2910 * Intent logs writes won't propagate their error to the root 2911 * I/O so don't mark these types of failures as pool-level 2912 * errors. 2913 */ 2914 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2915 return; 2916 2917 mutex_enter(&vd->vdev_stat_lock); 2918 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2919 if (zio->io_error == ECKSUM) 2920 vs->vs_checksum_errors++; 2921 else 2922 vs->vs_read_errors++; 2923 } 2924 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2925 vs->vs_write_errors++; 2926 mutex_exit(&vd->vdev_stat_lock); 2927 2928 if (type == ZIO_TYPE_WRITE && txg != 0 && 2929 (!(flags & ZIO_FLAG_IO_REPAIR) || 2930 (flags & ZIO_FLAG_SCAN_THREAD) || 2931 spa->spa_claiming)) { 2932 /* 2933 * This is either a normal write (not a repair), or it's 2934 * a repair induced by the scrub thread, or it's a repair 2935 * made by zil_claim() during spa_load() in the first txg. 2936 * In the normal case, we commit the DTL change in the same 2937 * txg as the block was born. In the scrub-induced repair 2938 * case, we know that scrubs run in first-pass syncing context, 2939 * so we commit the DTL change in spa_syncing_txg(spa). 2940 * In the zil_claim() case, we commit in spa_first_txg(spa). 2941 * 2942 * We currently do not make DTL entries for failed spontaneous 2943 * self-healing writes triggered by normal (non-scrubbing) 2944 * reads, because we have no transactional context in which to 2945 * do so -- and it's not clear that it'd be desirable anyway. 2946 */ 2947 if (vd->vdev_ops->vdev_op_leaf) { 2948 uint64_t commit_txg = txg; 2949 if (flags & ZIO_FLAG_SCAN_THREAD) { 2950 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2951 ASSERT(spa_sync_pass(spa) == 1); 2952 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 2953 commit_txg = spa_syncing_txg(spa); 2954 } else if (spa->spa_claiming) { 2955 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2956 commit_txg = spa_first_txg(spa); 2957 } 2958 ASSERT(commit_txg >= spa_syncing_txg(spa)); 2959 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 2960 return; 2961 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2962 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 2963 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 2964 } 2965 if (vd != rvd) 2966 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 2967 } 2968} 2969 2970/* 2971 * Update the in-core space usage stats for this vdev, its metaslab class, 2972 * and the root vdev. 2973 */ 2974void 2975vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 2976 int64_t space_delta) 2977{ 2978 int64_t dspace_delta = space_delta; 2979 spa_t *spa = vd->vdev_spa; 2980 vdev_t *rvd = spa->spa_root_vdev; 2981 metaslab_group_t *mg = vd->vdev_mg; 2982 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 2983 2984 ASSERT(vd == vd->vdev_top); 2985 2986 /* 2987 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 2988 * factor. We must calculate this here and not at the root vdev 2989 * because the root vdev's psize-to-asize is simply the max of its 2990 * childrens', thus not accurate enough for us. 2991 */ 2992 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 2993 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 2994 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 2995 vd->vdev_deflate_ratio; 2996 2997 mutex_enter(&vd->vdev_stat_lock); 2998 vd->vdev_stat.vs_alloc += alloc_delta; 2999 vd->vdev_stat.vs_space += space_delta; 3000 vd->vdev_stat.vs_dspace += dspace_delta; 3001 mutex_exit(&vd->vdev_stat_lock); 3002 3003 if (mc == spa_normal_class(spa)) { 3004 mutex_enter(&rvd->vdev_stat_lock); 3005 rvd->vdev_stat.vs_alloc += alloc_delta; 3006 rvd->vdev_stat.vs_space += space_delta; 3007 rvd->vdev_stat.vs_dspace += dspace_delta; 3008 mutex_exit(&rvd->vdev_stat_lock); 3009 } 3010 3011 if (mc != NULL) { 3012 ASSERT(rvd == vd->vdev_parent); 3013 ASSERT(vd->vdev_ms_count != 0); 3014 3015 metaslab_class_space_update(mc, 3016 alloc_delta, defer_delta, space_delta, dspace_delta); 3017 } 3018} 3019 3020/* 3021 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3022 * so that it will be written out next time the vdev configuration is synced. 3023 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3024 */ 3025void 3026vdev_config_dirty(vdev_t *vd) 3027{ 3028 spa_t *spa = vd->vdev_spa; 3029 vdev_t *rvd = spa->spa_root_vdev; 3030 int c; 3031 3032 ASSERT(spa_writeable(spa)); 3033 3034 /* 3035 * If this is an aux vdev (as with l2cache and spare devices), then we 3036 * update the vdev config manually and set the sync flag. 3037 */ 3038 if (vd->vdev_aux != NULL) { 3039 spa_aux_vdev_t *sav = vd->vdev_aux; 3040 nvlist_t **aux; 3041 uint_t naux; 3042 3043 for (c = 0; c < sav->sav_count; c++) { 3044 if (sav->sav_vdevs[c] == vd) 3045 break; 3046 } 3047 3048 if (c == sav->sav_count) { 3049 /* 3050 * We're being removed. There's nothing more to do. 3051 */ 3052 ASSERT(sav->sav_sync == B_TRUE); 3053 return; 3054 } 3055 3056 sav->sav_sync = B_TRUE; 3057 3058 if (nvlist_lookup_nvlist_array(sav->sav_config, 3059 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3060 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3061 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3062 } 3063 3064 ASSERT(c < naux); 3065 3066 /* 3067 * Setting the nvlist in the middle if the array is a little 3068 * sketchy, but it will work. 3069 */ 3070 nvlist_free(aux[c]); 3071 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3072 3073 return; 3074 } 3075 3076 /* 3077 * The dirty list is protected by the SCL_CONFIG lock. The caller 3078 * must either hold SCL_CONFIG as writer, or must be the sync thread 3079 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3080 * so this is sufficient to ensure mutual exclusion. 3081 */ 3082 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3083 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3084 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3085 3086 if (vd == rvd) { 3087 for (c = 0; c < rvd->vdev_children; c++) 3088 vdev_config_dirty(rvd->vdev_child[c]); 3089 } else { 3090 ASSERT(vd == vd->vdev_top); 3091 3092 if (!list_link_active(&vd->vdev_config_dirty_node) && 3093 !vd->vdev_ishole) 3094 list_insert_head(&spa->spa_config_dirty_list, vd); 3095 } 3096} 3097 3098void 3099vdev_config_clean(vdev_t *vd) 3100{ 3101 spa_t *spa = vd->vdev_spa; 3102 3103 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3104 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3105 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3106 3107 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3108 list_remove(&spa->spa_config_dirty_list, vd); 3109} 3110 3111/* 3112 * Mark a top-level vdev's state as dirty, so that the next pass of 3113 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3114 * the state changes from larger config changes because they require 3115 * much less locking, and are often needed for administrative actions. 3116 */ 3117void 3118vdev_state_dirty(vdev_t *vd) 3119{ 3120 spa_t *spa = vd->vdev_spa; 3121 3122 ASSERT(spa_writeable(spa)); 3123 ASSERT(vd == vd->vdev_top); 3124 3125 /* 3126 * The state list is protected by the SCL_STATE lock. The caller 3127 * must either hold SCL_STATE as writer, or must be the sync thread 3128 * (which holds SCL_STATE as reader). There's only one sync thread, 3129 * so this is sufficient to ensure mutual exclusion. 3130 */ 3131 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3132 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3133 spa_config_held(spa, SCL_STATE, RW_READER))); 3134 3135 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 3136 list_insert_head(&spa->spa_state_dirty_list, vd); 3137} 3138 3139void 3140vdev_state_clean(vdev_t *vd) 3141{ 3142 spa_t *spa = vd->vdev_spa; 3143 3144 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3145 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3146 spa_config_held(spa, SCL_STATE, RW_READER))); 3147 3148 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3149 list_remove(&spa->spa_state_dirty_list, vd); 3150} 3151 3152/* 3153 * Propagate vdev state up from children to parent. 3154 */ 3155void 3156vdev_propagate_state(vdev_t *vd) 3157{ 3158 spa_t *spa = vd->vdev_spa; 3159 vdev_t *rvd = spa->spa_root_vdev; 3160 int degraded = 0, faulted = 0; 3161 int corrupted = 0; 3162 vdev_t *child; 3163 3164 if (vd->vdev_children > 0) { 3165 for (int c = 0; c < vd->vdev_children; c++) { 3166 child = vd->vdev_child[c]; 3167 3168 /* 3169 * Don't factor holes into the decision. 3170 */ 3171 if (child->vdev_ishole) 3172 continue; 3173 3174 if (!vdev_readable(child) || 3175 (!vdev_writeable(child) && spa_writeable(spa))) { 3176 /* 3177 * Root special: if there is a top-level log 3178 * device, treat the root vdev as if it were 3179 * degraded. 3180 */ 3181 if (child->vdev_islog && vd == rvd) 3182 degraded++; 3183 else 3184 faulted++; 3185 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3186 degraded++; 3187 } 3188 3189 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3190 corrupted++; 3191 } 3192 3193 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3194 3195 /* 3196 * Root special: if there is a top-level vdev that cannot be 3197 * opened due to corrupted metadata, then propagate the root 3198 * vdev's aux state as 'corrupt' rather than 'insufficient 3199 * replicas'. 3200 */ 3201 if (corrupted && vd == rvd && 3202 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3203 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3204 VDEV_AUX_CORRUPT_DATA); 3205 } 3206 3207 if (vd->vdev_parent) 3208 vdev_propagate_state(vd->vdev_parent); 3209} 3210 3211/* 3212 * Set a vdev's state. If this is during an open, we don't update the parent 3213 * state, because we're in the process of opening children depth-first. 3214 * Otherwise, we propagate the change to the parent. 3215 * 3216 * If this routine places a device in a faulted state, an appropriate ereport is 3217 * generated. 3218 */ 3219void 3220vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 3221{ 3222 uint64_t save_state; 3223 spa_t *spa = vd->vdev_spa; 3224 3225 if (state == vd->vdev_state) { 3226 vd->vdev_stat.vs_aux = aux; 3227 return; 3228 } 3229 3230 save_state = vd->vdev_state; 3231 3232 vd->vdev_state = state; 3233 vd->vdev_stat.vs_aux = aux; 3234 3235 /* 3236 * If we are setting the vdev state to anything but an open state, then 3237 * always close the underlying device unless the device has requested 3238 * a delayed close (i.e. we're about to remove or fault the device). 3239 * Otherwise, we keep accessible but invalid devices open forever. 3240 * We don't call vdev_close() itself, because that implies some extra 3241 * checks (offline, etc) that we don't want here. This is limited to 3242 * leaf devices, because otherwise closing the device will affect other 3243 * children. 3244 */ 3245 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 3246 vd->vdev_ops->vdev_op_leaf) 3247 vd->vdev_ops->vdev_op_close(vd); 3248 3249 /* 3250 * If we have brought this vdev back into service, we need 3251 * to notify fmd so that it can gracefully repair any outstanding 3252 * cases due to a missing device. We do this in all cases, even those 3253 * that probably don't correlate to a repaired fault. This is sure to 3254 * catch all cases, and we let the zfs-retire agent sort it out. If 3255 * this is a transient state it's OK, as the retire agent will 3256 * double-check the state of the vdev before repairing it. 3257 */ 3258 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 3259 vd->vdev_prevstate != state) 3260 zfs_post_state_change(spa, vd); 3261 3262 if (vd->vdev_removed && 3263 state == VDEV_STATE_CANT_OPEN && 3264 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 3265 /* 3266 * If the previous state is set to VDEV_STATE_REMOVED, then this 3267 * device was previously marked removed and someone attempted to 3268 * reopen it. If this failed due to a nonexistent device, then 3269 * keep the device in the REMOVED state. We also let this be if 3270 * it is one of our special test online cases, which is only 3271 * attempting to online the device and shouldn't generate an FMA 3272 * fault. 3273 */ 3274 vd->vdev_state = VDEV_STATE_REMOVED; 3275 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 3276 } else if (state == VDEV_STATE_REMOVED) { 3277 vd->vdev_removed = B_TRUE; 3278 } else if (state == VDEV_STATE_CANT_OPEN) { 3279 /* 3280 * If we fail to open a vdev during an import or recovery, we 3281 * mark it as "not available", which signifies that it was 3282 * never there to begin with. Failure to open such a device 3283 * is not considered an error. 3284 */ 3285 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 3286 spa_load_state(spa) == SPA_LOAD_RECOVER) && 3287 vd->vdev_ops->vdev_op_leaf) 3288 vd->vdev_not_present = 1; 3289 3290 /* 3291 * Post the appropriate ereport. If the 'prevstate' field is 3292 * set to something other than VDEV_STATE_UNKNOWN, it indicates 3293 * that this is part of a vdev_reopen(). In this case, we don't 3294 * want to post the ereport if the device was already in the 3295 * CANT_OPEN state beforehand. 3296 * 3297 * If the 'checkremove' flag is set, then this is an attempt to 3298 * online the device in response to an insertion event. If we 3299 * hit this case, then we have detected an insertion event for a 3300 * faulted or offline device that wasn't in the removed state. 3301 * In this scenario, we don't post an ereport because we are 3302 * about to replace the device, or attempt an online with 3303 * vdev_forcefault, which will generate the fault for us. 3304 */ 3305 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 3306 !vd->vdev_not_present && !vd->vdev_checkremove && 3307 vd != spa->spa_root_vdev) { 3308 const char *class; 3309 3310 switch (aux) { 3311 case VDEV_AUX_OPEN_FAILED: 3312 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 3313 break; 3314 case VDEV_AUX_CORRUPT_DATA: 3315 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3316 break; 3317 case VDEV_AUX_NO_REPLICAS: 3318 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3319 break; 3320 case VDEV_AUX_BAD_GUID_SUM: 3321 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3322 break; 3323 case VDEV_AUX_TOO_SMALL: 3324 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3325 break; 3326 case VDEV_AUX_BAD_LABEL: 3327 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3328 break; 3329 default: 3330 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3331 } 3332 3333 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3334 } 3335 3336 /* Erase any notion of persistent removed state */ 3337 vd->vdev_removed = B_FALSE; 3338 } else { 3339 vd->vdev_removed = B_FALSE; 3340 } 3341 3342 if (!isopen && vd->vdev_parent) 3343 vdev_propagate_state(vd->vdev_parent); 3344} 3345 3346/* 3347 * Check the vdev configuration to ensure that it's capable of supporting 3348 * a root pool. 3349 * 3350 * On Solaris, we do not support RAID-Z or partial configuration. In 3351 * addition, only a single top-level vdev is allowed and none of the 3352 * leaves can be wholedisks. 3353 * 3354 * For FreeBSD, we can boot from any configuration. There is a 3355 * limitation that the boot filesystem must be either uncompressed or 3356 * compresses with lzjb compression but I'm not sure how to enforce 3357 * that here. 3358 */ 3359boolean_t 3360vdev_is_bootable(vdev_t *vd) 3361{ 3362#ifdef sun 3363 if (!vd->vdev_ops->vdev_op_leaf) { 3364 char *vdev_type = vd->vdev_ops->vdev_op_type; 3365 3366 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3367 vd->vdev_children > 1) { 3368 return (B_FALSE); 3369 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3370 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3371 return (B_FALSE); 3372 } 3373 } else if (vd->vdev_wholedisk == 1) { 3374 return (B_FALSE); 3375 } 3376 3377 for (int c = 0; c < vd->vdev_children; c++) { 3378 if (!vdev_is_bootable(vd->vdev_child[c])) 3379 return (B_FALSE); 3380 } 3381#endif /* sun */ 3382 return (B_TRUE); 3383} 3384 3385/* 3386 * Load the state from the original vdev tree (ovd) which 3387 * we've retrieved from the MOS config object. If the original 3388 * vdev was offline or faulted then we transfer that state to the 3389 * device in the current vdev tree (nvd). 3390 */ 3391void 3392vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3393{ 3394 spa_t *spa = nvd->vdev_spa; 3395 3396 ASSERT(nvd->vdev_top->vdev_islog); 3397 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3398 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3399 3400 for (int c = 0; c < nvd->vdev_children; c++) 3401 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3402 3403 if (nvd->vdev_ops->vdev_op_leaf) { 3404 /* 3405 * Restore the persistent vdev state 3406 */ 3407 nvd->vdev_offline = ovd->vdev_offline; 3408 nvd->vdev_faulted = ovd->vdev_faulted; 3409 nvd->vdev_degraded = ovd->vdev_degraded; 3410 nvd->vdev_removed = ovd->vdev_removed; 3411 } 3412} 3413 3414/* 3415 * Determine if a log device has valid content. If the vdev was 3416 * removed or faulted in the MOS config then we know that 3417 * the content on the log device has already been written to the pool. 3418 */ 3419boolean_t 3420vdev_log_state_valid(vdev_t *vd) 3421{ 3422 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3423 !vd->vdev_removed) 3424 return (B_TRUE); 3425 3426 for (int c = 0; c < vd->vdev_children; c++) 3427 if (vdev_log_state_valid(vd->vdev_child[c])) 3428 return (B_TRUE); 3429 3430 return (B_FALSE); 3431} 3432 3433/* 3434 * Expand a vdev if possible. 3435 */ 3436void 3437vdev_expand(vdev_t *vd, uint64_t txg) 3438{ 3439 ASSERT(vd->vdev_top == vd); 3440 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3441 3442 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3443 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3444 vdev_config_dirty(vd); 3445 } 3446} 3447 3448/* 3449 * Split a vdev. 3450 */ 3451void 3452vdev_split(vdev_t *vd) 3453{ 3454 vdev_t *cvd, *pvd = vd->vdev_parent; 3455 3456 vdev_remove_child(pvd, vd); 3457 vdev_compact_children(pvd); 3458 3459 cvd = pvd->vdev_child[0]; 3460 if (pvd->vdev_children == 1) { 3461 vdev_remove_parent(cvd); 3462 cvd->vdev_splitting = B_TRUE; 3463 } 3464 vdev_propagate_state(cvd); 3465} 3466 3467void 3468vdev_deadman(vdev_t *vd) 3469{ 3470 for (int c = 0; c < vd->vdev_children; c++) { 3471 vdev_t *cvd = vd->vdev_child[c]; 3472 3473 vdev_deadman(cvd); 3474 } 3475 3476 if (vd->vdev_ops->vdev_op_leaf) { 3477 vdev_queue_t *vq = &vd->vdev_queue; 3478 3479 mutex_enter(&vq->vq_lock); 3480 if (avl_numnodes(&vq->vq_active_tree) > 0) { 3481 spa_t *spa = vd->vdev_spa; 3482 zio_t *fio; 3483 uint64_t delta; 3484 3485 /* 3486 * Look at the head of all the pending queues, 3487 * if any I/O has been outstanding for longer than 3488 * the spa_deadman_synctime we panic the system. 3489 */ 3490 fio = avl_first(&vq->vq_active_tree); 3491 delta = gethrtime() - fio->io_timestamp; 3492 if (delta > spa_deadman_synctime(spa)) { 3493 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, " 3494 "delta %lluns, last io %lluns", 3495 fio->io_timestamp, delta, 3496 vq->vq_io_complete_ts); 3497 fm_panic("I/O to pool '%s' appears to be " 3498 "hung on vdev guid %llu at '%s'.", 3499 spa_name(spa), 3500 (long long unsigned int) vd->vdev_guid, 3501 vd->vdev_path); 3502 } 3503 } 3504 mutex_exit(&vq->vq_lock); 3505 } 3506} 3507