vdev.c revision 285001
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright 2015 Nexenta Systems, Inc. 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 spa_t *spa = cvd->vdev_spa; 282 283 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 284 ASSERT(cvd->vdev_parent == NULL); 285 286 cvd->vdev_parent = pvd; 287 288 if (pvd == NULL) 289 return; 290 291 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 292 293 oldsize = pvd->vdev_children * sizeof (vdev_t *); 294 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 295 newsize = pvd->vdev_children * sizeof (vdev_t *); 296 297 newchild = kmem_zalloc(newsize, KM_SLEEP); 298 if (pvd->vdev_child != NULL) { 299 bcopy(pvd->vdev_child, newchild, oldsize); 300 kmem_free(pvd->vdev_child, oldsize); 301 } 302 303 pvd->vdev_child = newchild; 304 pvd->vdev_child[id] = cvd; 305 306 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 307 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 308 309 /* 310 * Walk up all ancestors to update guid sum. 311 */ 312 for (; pvd != NULL; pvd = pvd->vdev_parent) 313 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 314} 315 316void 317vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 318{ 319 int c; 320 uint_t id = cvd->vdev_id; 321 322 ASSERT(cvd->vdev_parent == pvd); 323 324 if (pvd == NULL) 325 return; 326 327 ASSERT(id < pvd->vdev_children); 328 ASSERT(pvd->vdev_child[id] == cvd); 329 330 pvd->vdev_child[id] = NULL; 331 cvd->vdev_parent = NULL; 332 333 for (c = 0; c < pvd->vdev_children; c++) 334 if (pvd->vdev_child[c]) 335 break; 336 337 if (c == pvd->vdev_children) { 338 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 339 pvd->vdev_child = NULL; 340 pvd->vdev_children = 0; 341 } 342 343 /* 344 * Walk up all ancestors to update guid sum. 345 */ 346 for (; pvd != NULL; pvd = pvd->vdev_parent) 347 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 348} 349 350/* 351 * Remove any holes in the child array. 352 */ 353void 354vdev_compact_children(vdev_t *pvd) 355{ 356 vdev_t **newchild, *cvd; 357 int oldc = pvd->vdev_children; 358 int newc; 359 360 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 361 362 for (int c = newc = 0; c < oldc; c++) 363 if (pvd->vdev_child[c]) 364 newc++; 365 366 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 367 368 for (int c = newc = 0; c < oldc; c++) { 369 if ((cvd = pvd->vdev_child[c]) != NULL) { 370 newchild[newc] = cvd; 371 cvd->vdev_id = newc++; 372 } 373 } 374 375 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 376 pvd->vdev_child = newchild; 377 pvd->vdev_children = newc; 378} 379 380/* 381 * Allocate and minimally initialize a vdev_t. 382 */ 383vdev_t * 384vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 385{ 386 vdev_t *vd; 387 388 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 389 390 if (spa->spa_root_vdev == NULL) { 391 ASSERT(ops == &vdev_root_ops); 392 spa->spa_root_vdev = vd; 393 spa->spa_load_guid = spa_generate_guid(NULL); 394 } 395 396 if (guid == 0 && ops != &vdev_hole_ops) { 397 if (spa->spa_root_vdev == vd) { 398 /* 399 * The root vdev's guid will also be the pool guid, 400 * which must be unique among all pools. 401 */ 402 guid = spa_generate_guid(NULL); 403 } else { 404 /* 405 * Any other vdev's guid must be unique within the pool. 406 */ 407 guid = spa_generate_guid(spa); 408 } 409 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 410 } 411 412 vd->vdev_spa = spa; 413 vd->vdev_id = id; 414 vd->vdev_guid = guid; 415 vd->vdev_guid_sum = guid; 416 vd->vdev_ops = ops; 417 vd->vdev_state = VDEV_STATE_CLOSED; 418 vd->vdev_ishole = (ops == &vdev_hole_ops); 419 420 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 421 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 422 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 423 for (int t = 0; t < DTL_TYPES; t++) { 424 vd->vdev_dtl[t] = range_tree_create(NULL, NULL, 425 &vd->vdev_dtl_lock); 426 } 427 txg_list_create(&vd->vdev_ms_list, 428 offsetof(struct metaslab, ms_txg_node)); 429 txg_list_create(&vd->vdev_dtl_list, 430 offsetof(struct vdev, vdev_dtl_node)); 431 vd->vdev_stat.vs_timestamp = gethrtime(); 432 vdev_queue_init(vd); 433 vdev_cache_init(vd); 434 435 return (vd); 436} 437 438/* 439 * Allocate a new vdev. The 'alloctype' is used to control whether we are 440 * creating a new vdev or loading an existing one - the behavior is slightly 441 * different for each case. 442 */ 443int 444vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 445 int alloctype) 446{ 447 vdev_ops_t *ops; 448 char *type; 449 uint64_t guid = 0, islog, nparity; 450 vdev_t *vd; 451 452 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 453 454 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 455 return (SET_ERROR(EINVAL)); 456 457 if ((ops = vdev_getops(type)) == NULL) 458 return (SET_ERROR(EINVAL)); 459 460 /* 461 * If this is a load, get the vdev guid from the nvlist. 462 * Otherwise, vdev_alloc_common() will generate one for us. 463 */ 464 if (alloctype == VDEV_ALLOC_LOAD) { 465 uint64_t label_id; 466 467 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 468 label_id != id) 469 return (SET_ERROR(EINVAL)); 470 471 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 472 return (SET_ERROR(EINVAL)); 473 } else if (alloctype == VDEV_ALLOC_SPARE) { 474 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 475 return (SET_ERROR(EINVAL)); 476 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 477 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 478 return (SET_ERROR(EINVAL)); 479 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 480 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 481 return (SET_ERROR(EINVAL)); 482 } 483 484 /* 485 * The first allocated vdev must be of type 'root'. 486 */ 487 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 488 return (SET_ERROR(EINVAL)); 489 490 /* 491 * Determine whether we're a log vdev. 492 */ 493 islog = 0; 494 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 495 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 496 return (SET_ERROR(ENOTSUP)); 497 498 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 499 return (SET_ERROR(ENOTSUP)); 500 501 /* 502 * Set the nparity property for RAID-Z vdevs. 503 */ 504 nparity = -1ULL; 505 if (ops == &vdev_raidz_ops) { 506 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 507 &nparity) == 0) { 508 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 509 return (SET_ERROR(EINVAL)); 510 /* 511 * Previous versions could only support 1 or 2 parity 512 * device. 513 */ 514 if (nparity > 1 && 515 spa_version(spa) < SPA_VERSION_RAIDZ2) 516 return (SET_ERROR(ENOTSUP)); 517 if (nparity > 2 && 518 spa_version(spa) < SPA_VERSION_RAIDZ3) 519 return (SET_ERROR(ENOTSUP)); 520 } else { 521 /* 522 * We require the parity to be specified for SPAs that 523 * support multiple parity levels. 524 */ 525 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 526 return (SET_ERROR(EINVAL)); 527 /* 528 * Otherwise, we default to 1 parity device for RAID-Z. 529 */ 530 nparity = 1; 531 } 532 } else { 533 nparity = 0; 534 } 535 ASSERT(nparity != -1ULL); 536 537 vd = vdev_alloc_common(spa, id, guid, ops); 538 539 vd->vdev_islog = islog; 540 vd->vdev_nparity = nparity; 541 542 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 543 vd->vdev_path = spa_strdup(vd->vdev_path); 544 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 545 vd->vdev_devid = spa_strdup(vd->vdev_devid); 546 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 547 &vd->vdev_physpath) == 0) 548 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 549 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 550 vd->vdev_fru = spa_strdup(vd->vdev_fru); 551 552 /* 553 * Set the whole_disk property. If it's not specified, leave the value 554 * as -1. 555 */ 556 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 557 &vd->vdev_wholedisk) != 0) 558 vd->vdev_wholedisk = -1ULL; 559 560 /* 561 * Look for the 'not present' flag. This will only be set if the device 562 * was not present at the time of import. 563 */ 564 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 565 &vd->vdev_not_present); 566 567 /* 568 * Get the alignment requirement. 569 */ 570 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 571 572 /* 573 * Retrieve the vdev creation time. 574 */ 575 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 576 &vd->vdev_crtxg); 577 578 /* 579 * If we're a top-level vdev, try to load the allocation parameters. 580 */ 581 if (parent && !parent->vdev_parent && 582 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 583 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 584 &vd->vdev_ms_array); 585 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 586 &vd->vdev_ms_shift); 587 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 588 &vd->vdev_asize); 589 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 590 &vd->vdev_removing); 591 } 592 593 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 594 ASSERT(alloctype == VDEV_ALLOC_LOAD || 595 alloctype == VDEV_ALLOC_ADD || 596 alloctype == VDEV_ALLOC_SPLIT || 597 alloctype == VDEV_ALLOC_ROOTPOOL); 598 vd->vdev_mg = metaslab_group_create(islog ? 599 spa_log_class(spa) : spa_normal_class(spa), vd); 600 } 601 602 /* 603 * If we're a leaf vdev, try to load the DTL object and other state. 604 */ 605 if (vd->vdev_ops->vdev_op_leaf && 606 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 607 alloctype == VDEV_ALLOC_ROOTPOOL)) { 608 if (alloctype == VDEV_ALLOC_LOAD) { 609 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 610 &vd->vdev_dtl_object); 611 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 612 &vd->vdev_unspare); 613 } 614 615 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 616 uint64_t spare = 0; 617 618 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 619 &spare) == 0 && spare) 620 spa_spare_add(vd); 621 } 622 623 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 624 &vd->vdev_offline); 625 626 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 627 &vd->vdev_resilver_txg); 628 629 /* 630 * When importing a pool, we want to ignore the persistent fault 631 * state, as the diagnosis made on another system may not be 632 * valid in the current context. Local vdevs will 633 * remain in the faulted state. 634 */ 635 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 636 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 637 &vd->vdev_faulted); 638 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 639 &vd->vdev_degraded); 640 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 641 &vd->vdev_removed); 642 643 if (vd->vdev_faulted || vd->vdev_degraded) { 644 char *aux; 645 646 vd->vdev_label_aux = 647 VDEV_AUX_ERR_EXCEEDED; 648 if (nvlist_lookup_string(nv, 649 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 650 strcmp(aux, "external") == 0) 651 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 652 } 653 } 654 } 655 656 /* 657 * Add ourselves to the parent's list of children. 658 */ 659 vdev_add_child(parent, vd); 660 661 *vdp = vd; 662 663 return (0); 664} 665 666void 667vdev_free(vdev_t *vd) 668{ 669 spa_t *spa = vd->vdev_spa; 670 671 /* 672 * vdev_free() implies closing the vdev first. This is simpler than 673 * trying to ensure complicated semantics for all callers. 674 */ 675 vdev_close(vd); 676 677 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 678 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 679 680 /* 681 * Free all children. 682 */ 683 for (int c = 0; c < vd->vdev_children; c++) 684 vdev_free(vd->vdev_child[c]); 685 686 ASSERT(vd->vdev_child == NULL); 687 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 688 689 /* 690 * Discard allocation state. 691 */ 692 if (vd->vdev_mg != NULL) { 693 vdev_metaslab_fini(vd); 694 metaslab_group_destroy(vd->vdev_mg); 695 } 696 697 ASSERT0(vd->vdev_stat.vs_space); 698 ASSERT0(vd->vdev_stat.vs_dspace); 699 ASSERT0(vd->vdev_stat.vs_alloc); 700 701 /* 702 * Remove this vdev from its parent's child list. 703 */ 704 vdev_remove_child(vd->vdev_parent, vd); 705 706 ASSERT(vd->vdev_parent == NULL); 707 708 /* 709 * Clean up vdev structure. 710 */ 711 vdev_queue_fini(vd); 712 vdev_cache_fini(vd); 713 714 if (vd->vdev_path) 715 spa_strfree(vd->vdev_path); 716 if (vd->vdev_devid) 717 spa_strfree(vd->vdev_devid); 718 if (vd->vdev_physpath) 719 spa_strfree(vd->vdev_physpath); 720 if (vd->vdev_fru) 721 spa_strfree(vd->vdev_fru); 722 723 if (vd->vdev_isspare) 724 spa_spare_remove(vd); 725 if (vd->vdev_isl2cache) 726 spa_l2cache_remove(vd); 727 728 txg_list_destroy(&vd->vdev_ms_list); 729 txg_list_destroy(&vd->vdev_dtl_list); 730 731 mutex_enter(&vd->vdev_dtl_lock); 732 space_map_close(vd->vdev_dtl_sm); 733 for (int t = 0; t < DTL_TYPES; t++) { 734 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 735 range_tree_destroy(vd->vdev_dtl[t]); 736 } 737 mutex_exit(&vd->vdev_dtl_lock); 738 739 mutex_destroy(&vd->vdev_dtl_lock); 740 mutex_destroy(&vd->vdev_stat_lock); 741 mutex_destroy(&vd->vdev_probe_lock); 742 743 if (vd == spa->spa_root_vdev) 744 spa->spa_root_vdev = NULL; 745 746 kmem_free(vd, sizeof (vdev_t)); 747} 748 749/* 750 * Transfer top-level vdev state from svd to tvd. 751 */ 752static void 753vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 754{ 755 spa_t *spa = svd->vdev_spa; 756 metaslab_t *msp; 757 vdev_t *vd; 758 int t; 759 760 ASSERT(tvd == tvd->vdev_top); 761 762 tvd->vdev_ms_array = svd->vdev_ms_array; 763 tvd->vdev_ms_shift = svd->vdev_ms_shift; 764 tvd->vdev_ms_count = svd->vdev_ms_count; 765 766 svd->vdev_ms_array = 0; 767 svd->vdev_ms_shift = 0; 768 svd->vdev_ms_count = 0; 769 770 if (tvd->vdev_mg) 771 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 772 tvd->vdev_mg = svd->vdev_mg; 773 tvd->vdev_ms = svd->vdev_ms; 774 775 svd->vdev_mg = NULL; 776 svd->vdev_ms = NULL; 777 778 if (tvd->vdev_mg != NULL) 779 tvd->vdev_mg->mg_vd = tvd; 780 781 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 782 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 783 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 784 785 svd->vdev_stat.vs_alloc = 0; 786 svd->vdev_stat.vs_space = 0; 787 svd->vdev_stat.vs_dspace = 0; 788 789 for (t = 0; t < TXG_SIZE; t++) { 790 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 791 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 792 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 793 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 794 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 795 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 796 } 797 798 if (list_link_active(&svd->vdev_config_dirty_node)) { 799 vdev_config_clean(svd); 800 vdev_config_dirty(tvd); 801 } 802 803 if (list_link_active(&svd->vdev_state_dirty_node)) { 804 vdev_state_clean(svd); 805 vdev_state_dirty(tvd); 806 } 807 808 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 809 svd->vdev_deflate_ratio = 0; 810 811 tvd->vdev_islog = svd->vdev_islog; 812 svd->vdev_islog = 0; 813} 814 815static void 816vdev_top_update(vdev_t *tvd, vdev_t *vd) 817{ 818 if (vd == NULL) 819 return; 820 821 vd->vdev_top = tvd; 822 823 for (int c = 0; c < vd->vdev_children; c++) 824 vdev_top_update(tvd, vd->vdev_child[c]); 825} 826 827/* 828 * Add a mirror/replacing vdev above an existing vdev. 829 */ 830vdev_t * 831vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 832{ 833 spa_t *spa = cvd->vdev_spa; 834 vdev_t *pvd = cvd->vdev_parent; 835 vdev_t *mvd; 836 837 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 838 839 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 840 841 mvd->vdev_asize = cvd->vdev_asize; 842 mvd->vdev_min_asize = cvd->vdev_min_asize; 843 mvd->vdev_max_asize = cvd->vdev_max_asize; 844 mvd->vdev_ashift = cvd->vdev_ashift; 845 mvd->vdev_logical_ashift = cvd->vdev_logical_ashift; 846 mvd->vdev_physical_ashift = cvd->vdev_physical_ashift; 847 mvd->vdev_state = cvd->vdev_state; 848 mvd->vdev_crtxg = cvd->vdev_crtxg; 849 850 vdev_remove_child(pvd, cvd); 851 vdev_add_child(pvd, mvd); 852 cvd->vdev_id = mvd->vdev_children; 853 vdev_add_child(mvd, cvd); 854 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 855 856 if (mvd == mvd->vdev_top) 857 vdev_top_transfer(cvd, mvd); 858 859 return (mvd); 860} 861 862/* 863 * Remove a 1-way mirror/replacing vdev from the tree. 864 */ 865void 866vdev_remove_parent(vdev_t *cvd) 867{ 868 vdev_t *mvd = cvd->vdev_parent; 869 vdev_t *pvd = mvd->vdev_parent; 870 871 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 872 873 ASSERT(mvd->vdev_children == 1); 874 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 875 mvd->vdev_ops == &vdev_replacing_ops || 876 mvd->vdev_ops == &vdev_spare_ops); 877 cvd->vdev_ashift = mvd->vdev_ashift; 878 cvd->vdev_logical_ashift = mvd->vdev_logical_ashift; 879 cvd->vdev_physical_ashift = mvd->vdev_physical_ashift; 880 881 vdev_remove_child(mvd, cvd); 882 vdev_remove_child(pvd, mvd); 883 884 /* 885 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 886 * Otherwise, we could have detached an offline device, and when we 887 * go to import the pool we'll think we have two top-level vdevs, 888 * instead of a different version of the same top-level vdev. 889 */ 890 if (mvd->vdev_top == mvd) { 891 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 892 cvd->vdev_orig_guid = cvd->vdev_guid; 893 cvd->vdev_guid += guid_delta; 894 cvd->vdev_guid_sum += guid_delta; 895 } 896 cvd->vdev_id = mvd->vdev_id; 897 vdev_add_child(pvd, cvd); 898 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 899 900 if (cvd == cvd->vdev_top) 901 vdev_top_transfer(mvd, cvd); 902 903 ASSERT(mvd->vdev_children == 0); 904 vdev_free(mvd); 905} 906 907int 908vdev_metaslab_init(vdev_t *vd, uint64_t txg) 909{ 910 spa_t *spa = vd->vdev_spa; 911 objset_t *mos = spa->spa_meta_objset; 912 uint64_t m; 913 uint64_t oldc = vd->vdev_ms_count; 914 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 915 metaslab_t **mspp; 916 int error; 917 918 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 919 920 /* 921 * This vdev is not being allocated from yet or is a hole. 922 */ 923 if (vd->vdev_ms_shift == 0) 924 return (0); 925 926 ASSERT(!vd->vdev_ishole); 927 928 /* 929 * Compute the raidz-deflation ratio. Note, we hard-code 930 * in 128k (1 << 17) because it is the "typical" blocksize. 931 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change, 932 * otherwise it would inconsistently account for existing bp's. 933 */ 934 vd->vdev_deflate_ratio = (1 << 17) / 935 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 936 937 ASSERT(oldc <= newc); 938 939 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 940 941 if (oldc != 0) { 942 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 943 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 944 } 945 946 vd->vdev_ms = mspp; 947 vd->vdev_ms_count = newc; 948 949 for (m = oldc; m < newc; m++) { 950 uint64_t object = 0; 951 952 if (txg == 0) { 953 error = dmu_read(mos, vd->vdev_ms_array, 954 m * sizeof (uint64_t), sizeof (uint64_t), &object, 955 DMU_READ_PREFETCH); 956 if (error) 957 return (error); 958 } 959 960 error = metaslab_init(vd->vdev_mg, m, object, txg, 961 &(vd->vdev_ms[m])); 962 if (error) 963 return (error); 964 } 965 966 if (txg == 0) 967 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 968 969 /* 970 * If the vdev is being removed we don't activate 971 * the metaslabs since we want to ensure that no new 972 * allocations are performed on this device. 973 */ 974 if (oldc == 0 && !vd->vdev_removing) 975 metaslab_group_activate(vd->vdev_mg); 976 977 if (txg == 0) 978 spa_config_exit(spa, SCL_ALLOC, FTAG); 979 980 return (0); 981} 982 983void 984vdev_metaslab_fini(vdev_t *vd) 985{ 986 uint64_t m; 987 uint64_t count = vd->vdev_ms_count; 988 989 if (vd->vdev_ms != NULL) { 990 metaslab_group_passivate(vd->vdev_mg); 991 for (m = 0; m < count; m++) { 992 metaslab_t *msp = vd->vdev_ms[m]; 993 994 if (msp != NULL) 995 metaslab_fini(msp); 996 } 997 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 998 vd->vdev_ms = NULL; 999 } 1000} 1001 1002typedef struct vdev_probe_stats { 1003 boolean_t vps_readable; 1004 boolean_t vps_writeable; 1005 int vps_flags; 1006} vdev_probe_stats_t; 1007 1008static void 1009vdev_probe_done(zio_t *zio) 1010{ 1011 spa_t *spa = zio->io_spa; 1012 vdev_t *vd = zio->io_vd; 1013 vdev_probe_stats_t *vps = zio->io_private; 1014 1015 ASSERT(vd->vdev_probe_zio != NULL); 1016 1017 if (zio->io_type == ZIO_TYPE_READ) { 1018 if (zio->io_error == 0) 1019 vps->vps_readable = 1; 1020 if (zio->io_error == 0 && spa_writeable(spa)) { 1021 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1022 zio->io_offset, zio->io_size, zio->io_data, 1023 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1024 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1025 } else { 1026 zio_buf_free(zio->io_data, zio->io_size); 1027 } 1028 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1029 if (zio->io_error == 0) 1030 vps->vps_writeable = 1; 1031 zio_buf_free(zio->io_data, zio->io_size); 1032 } else if (zio->io_type == ZIO_TYPE_NULL) { 1033 zio_t *pio; 1034 1035 vd->vdev_cant_read |= !vps->vps_readable; 1036 vd->vdev_cant_write |= !vps->vps_writeable; 1037 1038 if (vdev_readable(vd) && 1039 (vdev_writeable(vd) || !spa_writeable(spa))) { 1040 zio->io_error = 0; 1041 } else { 1042 ASSERT(zio->io_error != 0); 1043 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1044 spa, vd, NULL, 0, 0); 1045 zio->io_error = SET_ERROR(ENXIO); 1046 } 1047 1048 mutex_enter(&vd->vdev_probe_lock); 1049 ASSERT(vd->vdev_probe_zio == zio); 1050 vd->vdev_probe_zio = NULL; 1051 mutex_exit(&vd->vdev_probe_lock); 1052 1053 while ((pio = zio_walk_parents(zio)) != NULL) 1054 if (!vdev_accessible(vd, pio)) 1055 pio->io_error = SET_ERROR(ENXIO); 1056 1057 kmem_free(vps, sizeof (*vps)); 1058 } 1059} 1060 1061/* 1062 * Determine whether this device is accessible. 1063 * 1064 * Read and write to several known locations: the pad regions of each 1065 * vdev label but the first, which we leave alone in case it contains 1066 * a VTOC. 1067 */ 1068zio_t * 1069vdev_probe(vdev_t *vd, zio_t *zio) 1070{ 1071 spa_t *spa = vd->vdev_spa; 1072 vdev_probe_stats_t *vps = NULL; 1073 zio_t *pio; 1074 1075 ASSERT(vd->vdev_ops->vdev_op_leaf); 1076 1077 /* 1078 * Don't probe the probe. 1079 */ 1080 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1081 return (NULL); 1082 1083 /* 1084 * To prevent 'probe storms' when a device fails, we create 1085 * just one probe i/o at a time. All zios that want to probe 1086 * this vdev will become parents of the probe io. 1087 */ 1088 mutex_enter(&vd->vdev_probe_lock); 1089 1090 if ((pio = vd->vdev_probe_zio) == NULL) { 1091 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1092 1093 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1094 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1095 ZIO_FLAG_TRYHARD; 1096 1097 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1098 /* 1099 * vdev_cant_read and vdev_cant_write can only 1100 * transition from TRUE to FALSE when we have the 1101 * SCL_ZIO lock as writer; otherwise they can only 1102 * transition from FALSE to TRUE. This ensures that 1103 * any zio looking at these values can assume that 1104 * failures persist for the life of the I/O. That's 1105 * important because when a device has intermittent 1106 * connectivity problems, we want to ensure that 1107 * they're ascribed to the device (ENXIO) and not 1108 * the zio (EIO). 1109 * 1110 * Since we hold SCL_ZIO as writer here, clear both 1111 * values so the probe can reevaluate from first 1112 * principles. 1113 */ 1114 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1115 vd->vdev_cant_read = B_FALSE; 1116 vd->vdev_cant_write = B_FALSE; 1117 } 1118 1119 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1120 vdev_probe_done, vps, 1121 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1122 1123 /* 1124 * We can't change the vdev state in this context, so we 1125 * kick off an async task to do it on our behalf. 1126 */ 1127 if (zio != NULL) { 1128 vd->vdev_probe_wanted = B_TRUE; 1129 spa_async_request(spa, SPA_ASYNC_PROBE); 1130 } 1131 } 1132 1133 if (zio != NULL) 1134 zio_add_child(zio, pio); 1135 1136 mutex_exit(&vd->vdev_probe_lock); 1137 1138 if (vps == NULL) { 1139 ASSERT(zio != NULL); 1140 return (NULL); 1141 } 1142 1143 for (int l = 1; l < VDEV_LABELS; l++) { 1144 zio_nowait(zio_read_phys(pio, vd, 1145 vdev_label_offset(vd->vdev_psize, l, 1146 offsetof(vdev_label_t, vl_pad2)), 1147 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1148 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1149 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1150 } 1151 1152 if (zio == NULL) 1153 return (pio); 1154 1155 zio_nowait(pio); 1156 return (NULL); 1157} 1158 1159static void 1160vdev_open_child(void *arg) 1161{ 1162 vdev_t *vd = arg; 1163 1164 vd->vdev_open_thread = curthread; 1165 vd->vdev_open_error = vdev_open(vd); 1166 vd->vdev_open_thread = NULL; 1167} 1168 1169boolean_t 1170vdev_uses_zvols(vdev_t *vd) 1171{ 1172 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1173 strlen(ZVOL_DIR)) == 0) 1174 return (B_TRUE); 1175 for (int c = 0; c < vd->vdev_children; c++) 1176 if (vdev_uses_zvols(vd->vdev_child[c])) 1177 return (B_TRUE); 1178 return (B_FALSE); 1179} 1180 1181void 1182vdev_open_children(vdev_t *vd) 1183{ 1184 taskq_t *tq; 1185 int children = vd->vdev_children; 1186 1187 /* 1188 * in order to handle pools on top of zvols, do the opens 1189 * in a single thread so that the same thread holds the 1190 * spa_namespace_lock 1191 */ 1192 if (B_TRUE || vdev_uses_zvols(vd)) { 1193 for (int c = 0; c < children; c++) 1194 vd->vdev_child[c]->vdev_open_error = 1195 vdev_open(vd->vdev_child[c]); 1196 return; 1197 } 1198 tq = taskq_create("vdev_open", children, minclsyspri, 1199 children, children, TASKQ_PREPOPULATE); 1200 1201 for (int c = 0; c < children; c++) 1202 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1203 TQ_SLEEP) != 0); 1204 1205 taskq_destroy(tq); 1206} 1207 1208/* 1209 * Prepare a virtual device for access. 1210 */ 1211int 1212vdev_open(vdev_t *vd) 1213{ 1214 spa_t *spa = vd->vdev_spa; 1215 int error; 1216 uint64_t osize = 0; 1217 uint64_t max_osize = 0; 1218 uint64_t asize, max_asize, psize; 1219 uint64_t logical_ashift = 0; 1220 uint64_t physical_ashift = 0; 1221 1222 ASSERT(vd->vdev_open_thread == curthread || 1223 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1224 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1225 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1226 vd->vdev_state == VDEV_STATE_OFFLINE); 1227 1228 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1229 vd->vdev_cant_read = B_FALSE; 1230 vd->vdev_cant_write = B_FALSE; 1231 vd->vdev_notrim = B_FALSE; 1232 vd->vdev_min_asize = vdev_get_min_asize(vd); 1233 1234 /* 1235 * If this vdev is not removed, check its fault status. If it's 1236 * faulted, bail out of the open. 1237 */ 1238 if (!vd->vdev_removed && vd->vdev_faulted) { 1239 ASSERT(vd->vdev_children == 0); 1240 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1241 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1242 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1243 vd->vdev_label_aux); 1244 return (SET_ERROR(ENXIO)); 1245 } else if (vd->vdev_offline) { 1246 ASSERT(vd->vdev_children == 0); 1247 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1248 return (SET_ERROR(ENXIO)); 1249 } 1250 1251 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, 1252 &logical_ashift, &physical_ashift); 1253 1254 /* 1255 * Reset the vdev_reopening flag so that we actually close 1256 * the vdev on error. 1257 */ 1258 vd->vdev_reopening = B_FALSE; 1259 if (zio_injection_enabled && error == 0) 1260 error = zio_handle_device_injection(vd, NULL, ENXIO); 1261 1262 if (error) { 1263 if (vd->vdev_removed && 1264 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1265 vd->vdev_removed = B_FALSE; 1266 1267 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1268 vd->vdev_stat.vs_aux); 1269 return (error); 1270 } 1271 1272 vd->vdev_removed = B_FALSE; 1273 1274 /* 1275 * Recheck the faulted flag now that we have confirmed that 1276 * the vdev is accessible. If we're faulted, bail. 1277 */ 1278 if (vd->vdev_faulted) { 1279 ASSERT(vd->vdev_children == 0); 1280 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1281 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1282 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1283 vd->vdev_label_aux); 1284 return (SET_ERROR(ENXIO)); 1285 } 1286 1287 if (vd->vdev_degraded) { 1288 ASSERT(vd->vdev_children == 0); 1289 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1290 VDEV_AUX_ERR_EXCEEDED); 1291 } else { 1292 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1293 } 1294 1295 /* 1296 * For hole or missing vdevs we just return success. 1297 */ 1298 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1299 return (0); 1300 1301 if (zfs_trim_enabled && !vd->vdev_notrim && vd->vdev_ops->vdev_op_leaf) 1302 trim_map_create(vd); 1303 1304 for (int c = 0; c < vd->vdev_children; c++) { 1305 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1306 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1307 VDEV_AUX_NONE); 1308 break; 1309 } 1310 } 1311 1312 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1313 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1314 1315 if (vd->vdev_children == 0) { 1316 if (osize < SPA_MINDEVSIZE) { 1317 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1318 VDEV_AUX_TOO_SMALL); 1319 return (SET_ERROR(EOVERFLOW)); 1320 } 1321 psize = osize; 1322 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1323 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1324 VDEV_LABEL_END_SIZE); 1325 } else { 1326 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1327 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1328 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1329 VDEV_AUX_TOO_SMALL); 1330 return (SET_ERROR(EOVERFLOW)); 1331 } 1332 psize = 0; 1333 asize = osize; 1334 max_asize = max_osize; 1335 } 1336 1337 vd->vdev_psize = psize; 1338 1339 /* 1340 * Make sure the allocatable size hasn't shrunk. 1341 */ 1342 if (asize < vd->vdev_min_asize) { 1343 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1344 VDEV_AUX_BAD_LABEL); 1345 return (SET_ERROR(EINVAL)); 1346 } 1347 1348 vd->vdev_physical_ashift = 1349 MAX(physical_ashift, vd->vdev_physical_ashift); 1350 vd->vdev_logical_ashift = MAX(logical_ashift, vd->vdev_logical_ashift); 1351 vd->vdev_ashift = MAX(vd->vdev_logical_ashift, vd->vdev_ashift); 1352 1353 if (vd->vdev_logical_ashift > SPA_MAXASHIFT) { 1354 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1355 VDEV_AUX_ASHIFT_TOO_BIG); 1356 return (EINVAL); 1357 } 1358 1359 if (vd->vdev_asize == 0) { 1360 /* 1361 * This is the first-ever open, so use the computed values. 1362 * For testing purposes, a higher ashift can be requested. 1363 */ 1364 vd->vdev_asize = asize; 1365 vd->vdev_max_asize = max_asize; 1366 } else { 1367 /* 1368 * Make sure the alignment requirement hasn't increased. 1369 */ 1370 if (vd->vdev_ashift > vd->vdev_top->vdev_ashift && 1371 vd->vdev_ops->vdev_op_leaf) { 1372 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1373 VDEV_AUX_BAD_LABEL); 1374 return (EINVAL); 1375 } 1376 vd->vdev_max_asize = max_asize; 1377 } 1378 1379 /* 1380 * If all children are healthy and the asize has increased, 1381 * then we've experienced dynamic LUN growth. If automatic 1382 * expansion is enabled then use the additional space. 1383 */ 1384 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1385 (vd->vdev_expanding || spa->spa_autoexpand)) 1386 vd->vdev_asize = asize; 1387 1388 vdev_set_min_asize(vd); 1389 1390 /* 1391 * Ensure we can issue some IO before declaring the 1392 * vdev open for business. 1393 */ 1394 if (vd->vdev_ops->vdev_op_leaf && 1395 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1396 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1397 VDEV_AUX_ERR_EXCEEDED); 1398 return (error); 1399 } 1400 1401 /* 1402 * Track the min and max ashift values for normal data devices. 1403 */ 1404 if (vd->vdev_top == vd && vd->vdev_ashift != 0 && 1405 !vd->vdev_islog && vd->vdev_aux == NULL) { 1406 if (vd->vdev_ashift > spa->spa_max_ashift) 1407 spa->spa_max_ashift = vd->vdev_ashift; 1408 if (vd->vdev_ashift < spa->spa_min_ashift) 1409 spa->spa_min_ashift = vd->vdev_ashift; 1410 } 1411 1412 /* 1413 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1414 * resilver. But don't do this if we are doing a reopen for a scrub, 1415 * since this would just restart the scrub we are already doing. 1416 */ 1417 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1418 vdev_resilver_needed(vd, NULL, NULL)) 1419 spa_async_request(spa, SPA_ASYNC_RESILVER); 1420 1421 return (0); 1422} 1423 1424/* 1425 * Called once the vdevs are all opened, this routine validates the label 1426 * contents. This needs to be done before vdev_load() so that we don't 1427 * inadvertently do repair I/Os to the wrong device. 1428 * 1429 * If 'strict' is false ignore the spa guid check. This is necessary because 1430 * if the machine crashed during a re-guid the new guid might have been written 1431 * to all of the vdev labels, but not the cached config. The strict check 1432 * will be performed when the pool is opened again using the mos config. 1433 * 1434 * This function will only return failure if one of the vdevs indicates that it 1435 * has since been destroyed or exported. This is only possible if 1436 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1437 * will be updated but the function will return 0. 1438 */ 1439int 1440vdev_validate(vdev_t *vd, boolean_t strict) 1441{ 1442 spa_t *spa = vd->vdev_spa; 1443 nvlist_t *label; 1444 uint64_t guid = 0, top_guid; 1445 uint64_t state; 1446 1447 for (int c = 0; c < vd->vdev_children; c++) 1448 if (vdev_validate(vd->vdev_child[c], strict) != 0) 1449 return (SET_ERROR(EBADF)); 1450 1451 /* 1452 * If the device has already failed, or was marked offline, don't do 1453 * any further validation. Otherwise, label I/O will fail and we will 1454 * overwrite the previous state. 1455 */ 1456 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1457 uint64_t aux_guid = 0; 1458 nvlist_t *nvl; 1459 uint64_t txg = spa_last_synced_txg(spa) != 0 ? 1460 spa_last_synced_txg(spa) : -1ULL; 1461 1462 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1463 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1464 VDEV_AUX_BAD_LABEL); 1465 return (0); 1466 } 1467 1468 /* 1469 * Determine if this vdev has been split off into another 1470 * pool. If so, then refuse to open it. 1471 */ 1472 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1473 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1474 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1475 VDEV_AUX_SPLIT_POOL); 1476 nvlist_free(label); 1477 return (0); 1478 } 1479 1480 if (strict && (nvlist_lookup_uint64(label, 1481 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 || 1482 guid != spa_guid(spa))) { 1483 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1484 VDEV_AUX_CORRUPT_DATA); 1485 nvlist_free(label); 1486 return (0); 1487 } 1488 1489 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1490 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1491 &aux_guid) != 0) 1492 aux_guid = 0; 1493 1494 /* 1495 * If this vdev just became a top-level vdev because its 1496 * sibling was detached, it will have adopted the parent's 1497 * vdev guid -- but the label may or may not be on disk yet. 1498 * Fortunately, either version of the label will have the 1499 * same top guid, so if we're a top-level vdev, we can 1500 * safely compare to that instead. 1501 * 1502 * If we split this vdev off instead, then we also check the 1503 * original pool's guid. We don't want to consider the vdev 1504 * corrupt if it is partway through a split operation. 1505 */ 1506 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1507 &guid) != 0 || 1508 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1509 &top_guid) != 0 || 1510 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1511 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1512 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1513 VDEV_AUX_CORRUPT_DATA); 1514 nvlist_free(label); 1515 return (0); 1516 } 1517 1518 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1519 &state) != 0) { 1520 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1521 VDEV_AUX_CORRUPT_DATA); 1522 nvlist_free(label); 1523 return (0); 1524 } 1525 1526 nvlist_free(label); 1527 1528 /* 1529 * If this is a verbatim import, no need to check the 1530 * state of the pool. 1531 */ 1532 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1533 spa_load_state(spa) == SPA_LOAD_OPEN && 1534 state != POOL_STATE_ACTIVE) 1535 return (SET_ERROR(EBADF)); 1536 1537 /* 1538 * If we were able to open and validate a vdev that was 1539 * previously marked permanently unavailable, clear that state 1540 * now. 1541 */ 1542 if (vd->vdev_not_present) 1543 vd->vdev_not_present = 0; 1544 } 1545 1546 return (0); 1547} 1548 1549/* 1550 * Close a virtual device. 1551 */ 1552void 1553vdev_close(vdev_t *vd) 1554{ 1555 spa_t *spa = vd->vdev_spa; 1556 vdev_t *pvd = vd->vdev_parent; 1557 1558 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1559 1560 /* 1561 * If our parent is reopening, then we are as well, unless we are 1562 * going offline. 1563 */ 1564 if (pvd != NULL && pvd->vdev_reopening) 1565 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1566 1567 vd->vdev_ops->vdev_op_close(vd); 1568 1569 vdev_cache_purge(vd); 1570 1571 if (vd->vdev_ops->vdev_op_leaf) 1572 trim_map_destroy(vd); 1573 1574 /* 1575 * We record the previous state before we close it, so that if we are 1576 * doing a reopen(), we don't generate FMA ereports if we notice that 1577 * it's still faulted. 1578 */ 1579 vd->vdev_prevstate = vd->vdev_state; 1580 1581 if (vd->vdev_offline) 1582 vd->vdev_state = VDEV_STATE_OFFLINE; 1583 else 1584 vd->vdev_state = VDEV_STATE_CLOSED; 1585 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1586} 1587 1588void 1589vdev_hold(vdev_t *vd) 1590{ 1591 spa_t *spa = vd->vdev_spa; 1592 1593 ASSERT(spa_is_root(spa)); 1594 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1595 return; 1596 1597 for (int c = 0; c < vd->vdev_children; c++) 1598 vdev_hold(vd->vdev_child[c]); 1599 1600 if (vd->vdev_ops->vdev_op_leaf) 1601 vd->vdev_ops->vdev_op_hold(vd); 1602} 1603 1604void 1605vdev_rele(vdev_t *vd) 1606{ 1607 spa_t *spa = vd->vdev_spa; 1608 1609 ASSERT(spa_is_root(spa)); 1610 for (int c = 0; c < vd->vdev_children; c++) 1611 vdev_rele(vd->vdev_child[c]); 1612 1613 if (vd->vdev_ops->vdev_op_leaf) 1614 vd->vdev_ops->vdev_op_rele(vd); 1615} 1616 1617/* 1618 * Reopen all interior vdevs and any unopened leaves. We don't actually 1619 * reopen leaf vdevs which had previously been opened as they might deadlock 1620 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1621 * If the leaf has never been opened then open it, as usual. 1622 */ 1623void 1624vdev_reopen(vdev_t *vd) 1625{ 1626 spa_t *spa = vd->vdev_spa; 1627 1628 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1629 1630 /* set the reopening flag unless we're taking the vdev offline */ 1631 vd->vdev_reopening = !vd->vdev_offline; 1632 vdev_close(vd); 1633 (void) vdev_open(vd); 1634 1635 /* 1636 * Call vdev_validate() here to make sure we have the same device. 1637 * Otherwise, a device with an invalid label could be successfully 1638 * opened in response to vdev_reopen(). 1639 */ 1640 if (vd->vdev_aux) { 1641 (void) vdev_validate_aux(vd); 1642 if (vdev_readable(vd) && vdev_writeable(vd) && 1643 vd->vdev_aux == &spa->spa_l2cache && 1644 !l2arc_vdev_present(vd)) 1645 l2arc_add_vdev(spa, vd); 1646 } else { 1647 (void) vdev_validate(vd, B_TRUE); 1648 } 1649 1650 /* 1651 * Reassess parent vdev's health. 1652 */ 1653 vdev_propagate_state(vd); 1654} 1655 1656int 1657vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1658{ 1659 int error; 1660 1661 /* 1662 * Normally, partial opens (e.g. of a mirror) are allowed. 1663 * For a create, however, we want to fail the request if 1664 * there are any components we can't open. 1665 */ 1666 error = vdev_open(vd); 1667 1668 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1669 vdev_close(vd); 1670 return (error ? error : ENXIO); 1671 } 1672 1673 /* 1674 * Recursively load DTLs and initialize all labels. 1675 */ 1676 if ((error = vdev_dtl_load(vd)) != 0 || 1677 (error = vdev_label_init(vd, txg, isreplacing ? 1678 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1679 vdev_close(vd); 1680 return (error); 1681 } 1682 1683 return (0); 1684} 1685 1686void 1687vdev_metaslab_set_size(vdev_t *vd) 1688{ 1689 /* 1690 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev. 1691 */ 1692 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev); 1693 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1694} 1695 1696/* 1697 * Maximize performance by inflating the configured ashift for top level 1698 * vdevs to be as close to the physical ashift as possible while maintaining 1699 * administrator defined limits and ensuring it doesn't go below the 1700 * logical ashift. 1701 */ 1702void 1703vdev_ashift_optimize(vdev_t *vd) 1704{ 1705 if (vd == vd->vdev_top) { 1706 if (vd->vdev_ashift < vd->vdev_physical_ashift) { 1707 vd->vdev_ashift = MIN( 1708 MAX(zfs_max_auto_ashift, vd->vdev_ashift), 1709 MAX(zfs_min_auto_ashift, vd->vdev_physical_ashift)); 1710 } else { 1711 /* 1712 * Unusual case where logical ashift > physical ashift 1713 * so we can't cap the calculated ashift based on max 1714 * ashift as that would cause failures. 1715 * We still check if we need to increase it to match 1716 * the min ashift. 1717 */ 1718 vd->vdev_ashift = MAX(zfs_min_auto_ashift, 1719 vd->vdev_ashift); 1720 } 1721 } 1722} 1723 1724void 1725vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1726{ 1727 ASSERT(vd == vd->vdev_top); 1728 ASSERT(!vd->vdev_ishole); 1729 ASSERT(ISP2(flags)); 1730 ASSERT(spa_writeable(vd->vdev_spa)); 1731 1732 if (flags & VDD_METASLAB) 1733 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1734 1735 if (flags & VDD_DTL) 1736 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1737 1738 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1739} 1740 1741void 1742vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 1743{ 1744 for (int c = 0; c < vd->vdev_children; c++) 1745 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 1746 1747 if (vd->vdev_ops->vdev_op_leaf) 1748 vdev_dirty(vd->vdev_top, flags, vd, txg); 1749} 1750 1751/* 1752 * DTLs. 1753 * 1754 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1755 * the vdev has less than perfect replication. There are four kinds of DTL: 1756 * 1757 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1758 * 1759 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1760 * 1761 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1762 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1763 * txgs that was scrubbed. 1764 * 1765 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1766 * persistent errors or just some device being offline. 1767 * Unlike the other three, the DTL_OUTAGE map is not generally 1768 * maintained; it's only computed when needed, typically to 1769 * determine whether a device can be detached. 1770 * 1771 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1772 * either has the data or it doesn't. 1773 * 1774 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1775 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1776 * if any child is less than fully replicated, then so is its parent. 1777 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1778 * comprising only those txgs which appear in 'maxfaults' or more children; 1779 * those are the txgs we don't have enough replication to read. For example, 1780 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1781 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1782 * two child DTL_MISSING maps. 1783 * 1784 * It should be clear from the above that to compute the DTLs and outage maps 1785 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1786 * Therefore, that is all we keep on disk. When loading the pool, or after 1787 * a configuration change, we generate all other DTLs from first principles. 1788 */ 1789void 1790vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1791{ 1792 range_tree_t *rt = vd->vdev_dtl[t]; 1793 1794 ASSERT(t < DTL_TYPES); 1795 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1796 ASSERT(spa_writeable(vd->vdev_spa)); 1797 1798 mutex_enter(rt->rt_lock); 1799 if (!range_tree_contains(rt, txg, size)) 1800 range_tree_add(rt, txg, size); 1801 mutex_exit(rt->rt_lock); 1802} 1803 1804boolean_t 1805vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1806{ 1807 range_tree_t *rt = vd->vdev_dtl[t]; 1808 boolean_t dirty = B_FALSE; 1809 1810 ASSERT(t < DTL_TYPES); 1811 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1812 1813 mutex_enter(rt->rt_lock); 1814 if (range_tree_space(rt) != 0) 1815 dirty = range_tree_contains(rt, txg, size); 1816 mutex_exit(rt->rt_lock); 1817 1818 return (dirty); 1819} 1820 1821boolean_t 1822vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1823{ 1824 range_tree_t *rt = vd->vdev_dtl[t]; 1825 boolean_t empty; 1826 1827 mutex_enter(rt->rt_lock); 1828 empty = (range_tree_space(rt) == 0); 1829 mutex_exit(rt->rt_lock); 1830 1831 return (empty); 1832} 1833 1834/* 1835 * Returns the lowest txg in the DTL range. 1836 */ 1837static uint64_t 1838vdev_dtl_min(vdev_t *vd) 1839{ 1840 range_seg_t *rs; 1841 1842 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1843 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1844 ASSERT0(vd->vdev_children); 1845 1846 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1847 return (rs->rs_start - 1); 1848} 1849 1850/* 1851 * Returns the highest txg in the DTL. 1852 */ 1853static uint64_t 1854vdev_dtl_max(vdev_t *vd) 1855{ 1856 range_seg_t *rs; 1857 1858 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1859 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1860 ASSERT0(vd->vdev_children); 1861 1862 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1863 return (rs->rs_end); 1864} 1865 1866/* 1867 * Determine if a resilvering vdev should remove any DTL entries from 1868 * its range. If the vdev was resilvering for the entire duration of the 1869 * scan then it should excise that range from its DTLs. Otherwise, this 1870 * vdev is considered partially resilvered and should leave its DTL 1871 * entries intact. The comment in vdev_dtl_reassess() describes how we 1872 * excise the DTLs. 1873 */ 1874static boolean_t 1875vdev_dtl_should_excise(vdev_t *vd) 1876{ 1877 spa_t *spa = vd->vdev_spa; 1878 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1879 1880 ASSERT0(scn->scn_phys.scn_errors); 1881 ASSERT0(vd->vdev_children); 1882 1883 if (vd->vdev_resilver_txg == 0 || 1884 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0) 1885 return (B_TRUE); 1886 1887 /* 1888 * When a resilver is initiated the scan will assign the scn_max_txg 1889 * value to the highest txg value that exists in all DTLs. If this 1890 * device's max DTL is not part of this scan (i.e. it is not in 1891 * the range (scn_min_txg, scn_max_txg] then it is not eligible 1892 * for excision. 1893 */ 1894 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 1895 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 1896 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 1897 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 1898 return (B_TRUE); 1899 } 1900 return (B_FALSE); 1901} 1902 1903/* 1904 * Reassess DTLs after a config change or scrub completion. 1905 */ 1906void 1907vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1908{ 1909 spa_t *spa = vd->vdev_spa; 1910 avl_tree_t reftree; 1911 int minref; 1912 1913 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1914 1915 for (int c = 0; c < vd->vdev_children; c++) 1916 vdev_dtl_reassess(vd->vdev_child[c], txg, 1917 scrub_txg, scrub_done); 1918 1919 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1920 return; 1921 1922 if (vd->vdev_ops->vdev_op_leaf) { 1923 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1924 1925 mutex_enter(&vd->vdev_dtl_lock); 1926 1927 /* 1928 * If we've completed a scan cleanly then determine 1929 * if this vdev should remove any DTLs. We only want to 1930 * excise regions on vdevs that were available during 1931 * the entire duration of this scan. 1932 */ 1933 if (scrub_txg != 0 && 1934 (spa->spa_scrub_started || 1935 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 1936 vdev_dtl_should_excise(vd)) { 1937 /* 1938 * We completed a scrub up to scrub_txg. If we 1939 * did it without rebooting, then the scrub dtl 1940 * will be valid, so excise the old region and 1941 * fold in the scrub dtl. Otherwise, leave the 1942 * dtl as-is if there was an error. 1943 * 1944 * There's little trick here: to excise the beginning 1945 * of the DTL_MISSING map, we put it into a reference 1946 * tree and then add a segment with refcnt -1 that 1947 * covers the range [0, scrub_txg). This means 1948 * that each txg in that range has refcnt -1 or 0. 1949 * We then add DTL_SCRUB with a refcnt of 2, so that 1950 * entries in the range [0, scrub_txg) will have a 1951 * positive refcnt -- either 1 or 2. We then convert 1952 * the reference tree into the new DTL_MISSING map. 1953 */ 1954 space_reftree_create(&reftree); 1955 space_reftree_add_map(&reftree, 1956 vd->vdev_dtl[DTL_MISSING], 1); 1957 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 1958 space_reftree_add_map(&reftree, 1959 vd->vdev_dtl[DTL_SCRUB], 2); 1960 space_reftree_generate_map(&reftree, 1961 vd->vdev_dtl[DTL_MISSING], 1); 1962 space_reftree_destroy(&reftree); 1963 } 1964 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1965 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1966 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 1967 if (scrub_done) 1968 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1969 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1970 if (!vdev_readable(vd)) 1971 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1972 else 1973 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1974 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 1975 1976 /* 1977 * If the vdev was resilvering and no longer has any 1978 * DTLs then reset its resilvering flag and dirty 1979 * the top level so that we persist the change. 1980 */ 1981 if (vd->vdev_resilver_txg != 0 && 1982 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 && 1983 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0) { 1984 vd->vdev_resilver_txg = 0; 1985 vdev_config_dirty(vd->vdev_top); 1986 } 1987 1988 mutex_exit(&vd->vdev_dtl_lock); 1989 1990 if (txg != 0) 1991 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 1992 return; 1993 } 1994 1995 mutex_enter(&vd->vdev_dtl_lock); 1996 for (int t = 0; t < DTL_TYPES; t++) { 1997 /* account for child's outage in parent's missing map */ 1998 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 1999 if (t == DTL_SCRUB) 2000 continue; /* leaf vdevs only */ 2001 if (t == DTL_PARTIAL) 2002 minref = 1; /* i.e. non-zero */ 2003 else if (vd->vdev_nparity != 0) 2004 minref = vd->vdev_nparity + 1; /* RAID-Z */ 2005 else 2006 minref = vd->vdev_children; /* any kind of mirror */ 2007 space_reftree_create(&reftree); 2008 for (int c = 0; c < vd->vdev_children; c++) { 2009 vdev_t *cvd = vd->vdev_child[c]; 2010 mutex_enter(&cvd->vdev_dtl_lock); 2011 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 2012 mutex_exit(&cvd->vdev_dtl_lock); 2013 } 2014 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2015 space_reftree_destroy(&reftree); 2016 } 2017 mutex_exit(&vd->vdev_dtl_lock); 2018} 2019 2020int 2021vdev_dtl_load(vdev_t *vd) 2022{ 2023 spa_t *spa = vd->vdev_spa; 2024 objset_t *mos = spa->spa_meta_objset; 2025 int error = 0; 2026 2027 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2028 ASSERT(!vd->vdev_ishole); 2029 2030 error = space_map_open(&vd->vdev_dtl_sm, mos, 2031 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock); 2032 if (error) 2033 return (error); 2034 ASSERT(vd->vdev_dtl_sm != NULL); 2035 2036 mutex_enter(&vd->vdev_dtl_lock); 2037 2038 /* 2039 * Now that we've opened the space_map we need to update 2040 * the in-core DTL. 2041 */ 2042 space_map_update(vd->vdev_dtl_sm); 2043 2044 error = space_map_load(vd->vdev_dtl_sm, 2045 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2046 mutex_exit(&vd->vdev_dtl_lock); 2047 2048 return (error); 2049 } 2050 2051 for (int c = 0; c < vd->vdev_children; c++) { 2052 error = vdev_dtl_load(vd->vdev_child[c]); 2053 if (error != 0) 2054 break; 2055 } 2056 2057 return (error); 2058} 2059 2060void 2061vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2062{ 2063 spa_t *spa = vd->vdev_spa; 2064 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2065 objset_t *mos = spa->spa_meta_objset; 2066 range_tree_t *rtsync; 2067 kmutex_t rtlock; 2068 dmu_tx_t *tx; 2069 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2070 2071 ASSERT(!vd->vdev_ishole); 2072 ASSERT(vd->vdev_ops->vdev_op_leaf); 2073 2074 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2075 2076 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2077 mutex_enter(&vd->vdev_dtl_lock); 2078 space_map_free(vd->vdev_dtl_sm, tx); 2079 space_map_close(vd->vdev_dtl_sm); 2080 vd->vdev_dtl_sm = NULL; 2081 mutex_exit(&vd->vdev_dtl_lock); 2082 dmu_tx_commit(tx); 2083 return; 2084 } 2085 2086 if (vd->vdev_dtl_sm == NULL) { 2087 uint64_t new_object; 2088 2089 new_object = space_map_alloc(mos, tx); 2090 VERIFY3U(new_object, !=, 0); 2091 2092 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2093 0, -1ULL, 0, &vd->vdev_dtl_lock)); 2094 ASSERT(vd->vdev_dtl_sm != NULL); 2095 } 2096 2097 bzero(&rtlock, sizeof(rtlock)); 2098 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL); 2099 2100 rtsync = range_tree_create(NULL, NULL, &rtlock); 2101 2102 mutex_enter(&rtlock); 2103 2104 mutex_enter(&vd->vdev_dtl_lock); 2105 range_tree_walk(rt, range_tree_add, rtsync); 2106 mutex_exit(&vd->vdev_dtl_lock); 2107 2108 space_map_truncate(vd->vdev_dtl_sm, tx); 2109 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx); 2110 range_tree_vacate(rtsync, NULL, NULL); 2111 2112 range_tree_destroy(rtsync); 2113 2114 mutex_exit(&rtlock); 2115 mutex_destroy(&rtlock); 2116 2117 /* 2118 * If the object for the space map has changed then dirty 2119 * the top level so that we update the config. 2120 */ 2121 if (object != space_map_object(vd->vdev_dtl_sm)) { 2122 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, " 2123 "new object %llu", txg, spa_name(spa), object, 2124 space_map_object(vd->vdev_dtl_sm)); 2125 vdev_config_dirty(vd->vdev_top); 2126 } 2127 2128 dmu_tx_commit(tx); 2129 2130 mutex_enter(&vd->vdev_dtl_lock); 2131 space_map_update(vd->vdev_dtl_sm); 2132 mutex_exit(&vd->vdev_dtl_lock); 2133} 2134 2135/* 2136 * Determine whether the specified vdev can be offlined/detached/removed 2137 * without losing data. 2138 */ 2139boolean_t 2140vdev_dtl_required(vdev_t *vd) 2141{ 2142 spa_t *spa = vd->vdev_spa; 2143 vdev_t *tvd = vd->vdev_top; 2144 uint8_t cant_read = vd->vdev_cant_read; 2145 boolean_t required; 2146 2147 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2148 2149 if (vd == spa->spa_root_vdev || vd == tvd) 2150 return (B_TRUE); 2151 2152 /* 2153 * Temporarily mark the device as unreadable, and then determine 2154 * whether this results in any DTL outages in the top-level vdev. 2155 * If not, we can safely offline/detach/remove the device. 2156 */ 2157 vd->vdev_cant_read = B_TRUE; 2158 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2159 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2160 vd->vdev_cant_read = cant_read; 2161 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2162 2163 if (!required && zio_injection_enabled) 2164 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2165 2166 return (required); 2167} 2168 2169/* 2170 * Determine if resilver is needed, and if so the txg range. 2171 */ 2172boolean_t 2173vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2174{ 2175 boolean_t needed = B_FALSE; 2176 uint64_t thismin = UINT64_MAX; 2177 uint64_t thismax = 0; 2178 2179 if (vd->vdev_children == 0) { 2180 mutex_enter(&vd->vdev_dtl_lock); 2181 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 && 2182 vdev_writeable(vd)) { 2183 2184 thismin = vdev_dtl_min(vd); 2185 thismax = vdev_dtl_max(vd); 2186 needed = B_TRUE; 2187 } 2188 mutex_exit(&vd->vdev_dtl_lock); 2189 } else { 2190 for (int c = 0; c < vd->vdev_children; c++) { 2191 vdev_t *cvd = vd->vdev_child[c]; 2192 uint64_t cmin, cmax; 2193 2194 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2195 thismin = MIN(thismin, cmin); 2196 thismax = MAX(thismax, cmax); 2197 needed = B_TRUE; 2198 } 2199 } 2200 } 2201 2202 if (needed && minp) { 2203 *minp = thismin; 2204 *maxp = thismax; 2205 } 2206 return (needed); 2207} 2208 2209void 2210vdev_load(vdev_t *vd) 2211{ 2212 /* 2213 * Recursively load all children. 2214 */ 2215 for (int c = 0; c < vd->vdev_children; c++) 2216 vdev_load(vd->vdev_child[c]); 2217 2218 /* 2219 * If this is a top-level vdev, initialize its metaslabs. 2220 */ 2221 if (vd == vd->vdev_top && !vd->vdev_ishole && 2222 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 2223 vdev_metaslab_init(vd, 0) != 0)) 2224 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2225 VDEV_AUX_CORRUPT_DATA); 2226 2227 /* 2228 * If this is a leaf vdev, load its DTL. 2229 */ 2230 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 2231 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2232 VDEV_AUX_CORRUPT_DATA); 2233} 2234 2235/* 2236 * The special vdev case is used for hot spares and l2cache devices. Its 2237 * sole purpose it to set the vdev state for the associated vdev. To do this, 2238 * we make sure that we can open the underlying device, then try to read the 2239 * label, and make sure that the label is sane and that it hasn't been 2240 * repurposed to another pool. 2241 */ 2242int 2243vdev_validate_aux(vdev_t *vd) 2244{ 2245 nvlist_t *label; 2246 uint64_t guid, version; 2247 uint64_t state; 2248 2249 if (!vdev_readable(vd)) 2250 return (0); 2251 2252 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2253 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2254 VDEV_AUX_CORRUPT_DATA); 2255 return (-1); 2256 } 2257 2258 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2259 !SPA_VERSION_IS_SUPPORTED(version) || 2260 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2261 guid != vd->vdev_guid || 2262 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2263 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2264 VDEV_AUX_CORRUPT_DATA); 2265 nvlist_free(label); 2266 return (-1); 2267 } 2268 2269 /* 2270 * We don't actually check the pool state here. If it's in fact in 2271 * use by another pool, we update this fact on the fly when requested. 2272 */ 2273 nvlist_free(label); 2274 return (0); 2275} 2276 2277void 2278vdev_remove(vdev_t *vd, uint64_t txg) 2279{ 2280 spa_t *spa = vd->vdev_spa; 2281 objset_t *mos = spa->spa_meta_objset; 2282 dmu_tx_t *tx; 2283 2284 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2285 2286 if (vd->vdev_ms != NULL) { 2287 metaslab_group_t *mg = vd->vdev_mg; 2288 2289 metaslab_group_histogram_verify(mg); 2290 metaslab_class_histogram_verify(mg->mg_class); 2291 2292 for (int m = 0; m < vd->vdev_ms_count; m++) { 2293 metaslab_t *msp = vd->vdev_ms[m]; 2294 2295 if (msp == NULL || msp->ms_sm == NULL) 2296 continue; 2297 2298 mutex_enter(&msp->ms_lock); 2299 /* 2300 * If the metaslab was not loaded when the vdev 2301 * was removed then the histogram accounting may 2302 * not be accurate. Update the histogram information 2303 * here so that we ensure that the metaslab group 2304 * and metaslab class are up-to-date. 2305 */ 2306 metaslab_group_histogram_remove(mg, msp); 2307 2308 VERIFY0(space_map_allocated(msp->ms_sm)); 2309 space_map_free(msp->ms_sm, tx); 2310 space_map_close(msp->ms_sm); 2311 msp->ms_sm = NULL; 2312 mutex_exit(&msp->ms_lock); 2313 } 2314 2315 metaslab_group_histogram_verify(mg); 2316 metaslab_class_histogram_verify(mg->mg_class); 2317 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 2318 ASSERT0(mg->mg_histogram[i]); 2319 2320 } 2321 2322 if (vd->vdev_ms_array) { 2323 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2324 vd->vdev_ms_array = 0; 2325 } 2326 dmu_tx_commit(tx); 2327} 2328 2329void 2330vdev_sync_done(vdev_t *vd, uint64_t txg) 2331{ 2332 metaslab_t *msp; 2333 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2334 2335 ASSERT(!vd->vdev_ishole); 2336 2337 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2338 metaslab_sync_done(msp, txg); 2339 2340 if (reassess) 2341 metaslab_sync_reassess(vd->vdev_mg); 2342} 2343 2344void 2345vdev_sync(vdev_t *vd, uint64_t txg) 2346{ 2347 spa_t *spa = vd->vdev_spa; 2348 vdev_t *lvd; 2349 metaslab_t *msp; 2350 dmu_tx_t *tx; 2351 2352 ASSERT(!vd->vdev_ishole); 2353 2354 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2355 ASSERT(vd == vd->vdev_top); 2356 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2357 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2358 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2359 ASSERT(vd->vdev_ms_array != 0); 2360 vdev_config_dirty(vd); 2361 dmu_tx_commit(tx); 2362 } 2363 2364 /* 2365 * Remove the metadata associated with this vdev once it's empty. 2366 */ 2367 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2368 vdev_remove(vd, txg); 2369 2370 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2371 metaslab_sync(msp, txg); 2372 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2373 } 2374 2375 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2376 vdev_dtl_sync(lvd, txg); 2377 2378 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2379} 2380 2381uint64_t 2382vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2383{ 2384 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2385} 2386 2387/* 2388 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2389 * not be opened, and no I/O is attempted. 2390 */ 2391int 2392vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2393{ 2394 vdev_t *vd, *tvd; 2395 2396 spa_vdev_state_enter(spa, SCL_NONE); 2397 2398 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2399 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2400 2401 if (!vd->vdev_ops->vdev_op_leaf) 2402 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2403 2404 tvd = vd->vdev_top; 2405 2406 /* 2407 * We don't directly use the aux state here, but if we do a 2408 * vdev_reopen(), we need this value to be present to remember why we 2409 * were faulted. 2410 */ 2411 vd->vdev_label_aux = aux; 2412 2413 /* 2414 * Faulted state takes precedence over degraded. 2415 */ 2416 vd->vdev_delayed_close = B_FALSE; 2417 vd->vdev_faulted = 1ULL; 2418 vd->vdev_degraded = 0ULL; 2419 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2420 2421 /* 2422 * If this device has the only valid copy of the data, then 2423 * back off and simply mark the vdev as degraded instead. 2424 */ 2425 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2426 vd->vdev_degraded = 1ULL; 2427 vd->vdev_faulted = 0ULL; 2428 2429 /* 2430 * If we reopen the device and it's not dead, only then do we 2431 * mark it degraded. 2432 */ 2433 vdev_reopen(tvd); 2434 2435 if (vdev_readable(vd)) 2436 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2437 } 2438 2439 return (spa_vdev_state_exit(spa, vd, 0)); 2440} 2441 2442/* 2443 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2444 * user that something is wrong. The vdev continues to operate as normal as far 2445 * as I/O is concerned. 2446 */ 2447int 2448vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2449{ 2450 vdev_t *vd; 2451 2452 spa_vdev_state_enter(spa, SCL_NONE); 2453 2454 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2455 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2456 2457 if (!vd->vdev_ops->vdev_op_leaf) 2458 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2459 2460 /* 2461 * If the vdev is already faulted, then don't do anything. 2462 */ 2463 if (vd->vdev_faulted || vd->vdev_degraded) 2464 return (spa_vdev_state_exit(spa, NULL, 0)); 2465 2466 vd->vdev_degraded = 1ULL; 2467 if (!vdev_is_dead(vd)) 2468 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2469 aux); 2470 2471 return (spa_vdev_state_exit(spa, vd, 0)); 2472} 2473 2474/* 2475 * Online the given vdev. 2476 * 2477 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 2478 * spare device should be detached when the device finishes resilvering. 2479 * Second, the online should be treated like a 'test' online case, so no FMA 2480 * events are generated if the device fails to open. 2481 */ 2482int 2483vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2484{ 2485 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2486 2487 spa_vdev_state_enter(spa, SCL_NONE); 2488 2489 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2490 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2491 2492 if (!vd->vdev_ops->vdev_op_leaf) 2493 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2494 2495 tvd = vd->vdev_top; 2496 vd->vdev_offline = B_FALSE; 2497 vd->vdev_tmpoffline = B_FALSE; 2498 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2499 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2500 2501 /* XXX - L2ARC 1.0 does not support expansion */ 2502 if (!vd->vdev_aux) { 2503 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2504 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2505 } 2506 2507 vdev_reopen(tvd); 2508 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2509 2510 if (!vd->vdev_aux) { 2511 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2512 pvd->vdev_expanding = B_FALSE; 2513 } 2514 2515 if (newstate) 2516 *newstate = vd->vdev_state; 2517 if ((flags & ZFS_ONLINE_UNSPARE) && 2518 !vdev_is_dead(vd) && vd->vdev_parent && 2519 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2520 vd->vdev_parent->vdev_child[0] == vd) 2521 vd->vdev_unspare = B_TRUE; 2522 2523 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2524 2525 /* XXX - L2ARC 1.0 does not support expansion */ 2526 if (vd->vdev_aux) 2527 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2528 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2529 } 2530 return (spa_vdev_state_exit(spa, vd, 0)); 2531} 2532 2533static int 2534vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2535{ 2536 vdev_t *vd, *tvd; 2537 int error = 0; 2538 uint64_t generation; 2539 metaslab_group_t *mg; 2540 2541top: 2542 spa_vdev_state_enter(spa, SCL_ALLOC); 2543 2544 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2545 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2546 2547 if (!vd->vdev_ops->vdev_op_leaf) 2548 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2549 2550 tvd = vd->vdev_top; 2551 mg = tvd->vdev_mg; 2552 generation = spa->spa_config_generation + 1; 2553 2554 /* 2555 * If the device isn't already offline, try to offline it. 2556 */ 2557 if (!vd->vdev_offline) { 2558 /* 2559 * If this device has the only valid copy of some data, 2560 * don't allow it to be offlined. Log devices are always 2561 * expendable. 2562 */ 2563 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2564 vdev_dtl_required(vd)) 2565 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2566 2567 /* 2568 * If the top-level is a slog and it has had allocations 2569 * then proceed. We check that the vdev's metaslab group 2570 * is not NULL since it's possible that we may have just 2571 * added this vdev but not yet initialized its metaslabs. 2572 */ 2573 if (tvd->vdev_islog && mg != NULL) { 2574 /* 2575 * Prevent any future allocations. 2576 */ 2577 metaslab_group_passivate(mg); 2578 (void) spa_vdev_state_exit(spa, vd, 0); 2579 2580 error = spa_offline_log(spa); 2581 2582 spa_vdev_state_enter(spa, SCL_ALLOC); 2583 2584 /* 2585 * Check to see if the config has changed. 2586 */ 2587 if (error || generation != spa->spa_config_generation) { 2588 metaslab_group_activate(mg); 2589 if (error) 2590 return (spa_vdev_state_exit(spa, 2591 vd, error)); 2592 (void) spa_vdev_state_exit(spa, vd, 0); 2593 goto top; 2594 } 2595 ASSERT0(tvd->vdev_stat.vs_alloc); 2596 } 2597 2598 /* 2599 * Offline this device and reopen its top-level vdev. 2600 * If the top-level vdev is a log device then just offline 2601 * it. Otherwise, if this action results in the top-level 2602 * vdev becoming unusable, undo it and fail the request. 2603 */ 2604 vd->vdev_offline = B_TRUE; 2605 vdev_reopen(tvd); 2606 2607 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2608 vdev_is_dead(tvd)) { 2609 vd->vdev_offline = B_FALSE; 2610 vdev_reopen(tvd); 2611 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2612 } 2613 2614 /* 2615 * Add the device back into the metaslab rotor so that 2616 * once we online the device it's open for business. 2617 */ 2618 if (tvd->vdev_islog && mg != NULL) 2619 metaslab_group_activate(mg); 2620 } 2621 2622 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2623 2624 return (spa_vdev_state_exit(spa, vd, 0)); 2625} 2626 2627int 2628vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2629{ 2630 int error; 2631 2632 mutex_enter(&spa->spa_vdev_top_lock); 2633 error = vdev_offline_locked(spa, guid, flags); 2634 mutex_exit(&spa->spa_vdev_top_lock); 2635 2636 return (error); 2637} 2638 2639/* 2640 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2641 * vdev_offline(), we assume the spa config is locked. We also clear all 2642 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2643 */ 2644void 2645vdev_clear(spa_t *spa, vdev_t *vd) 2646{ 2647 vdev_t *rvd = spa->spa_root_vdev; 2648 2649 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2650 2651 if (vd == NULL) 2652 vd = rvd; 2653 2654 vd->vdev_stat.vs_read_errors = 0; 2655 vd->vdev_stat.vs_write_errors = 0; 2656 vd->vdev_stat.vs_checksum_errors = 0; 2657 2658 for (int c = 0; c < vd->vdev_children; c++) 2659 vdev_clear(spa, vd->vdev_child[c]); 2660 2661 if (vd == rvd) { 2662 for (int c = 0; c < spa->spa_l2cache.sav_count; c++) 2663 vdev_clear(spa, spa->spa_l2cache.sav_vdevs[c]); 2664 2665 for (int c = 0; c < spa->spa_spares.sav_count; c++) 2666 vdev_clear(spa, spa->spa_spares.sav_vdevs[c]); 2667 } 2668 2669 /* 2670 * If we're in the FAULTED state or have experienced failed I/O, then 2671 * clear the persistent state and attempt to reopen the device. We 2672 * also mark the vdev config dirty, so that the new faulted state is 2673 * written out to disk. 2674 */ 2675 if (vd->vdev_faulted || vd->vdev_degraded || 2676 !vdev_readable(vd) || !vdev_writeable(vd)) { 2677 2678 /* 2679 * When reopening in reponse to a clear event, it may be due to 2680 * a fmadm repair request. In this case, if the device is 2681 * still broken, we want to still post the ereport again. 2682 */ 2683 vd->vdev_forcefault = B_TRUE; 2684 2685 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2686 vd->vdev_cant_read = B_FALSE; 2687 vd->vdev_cant_write = B_FALSE; 2688 2689 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2690 2691 vd->vdev_forcefault = B_FALSE; 2692 2693 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2694 vdev_state_dirty(vd->vdev_top); 2695 2696 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2697 spa_async_request(spa, SPA_ASYNC_RESILVER); 2698 2699 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2700 } 2701 2702 /* 2703 * When clearing a FMA-diagnosed fault, we always want to 2704 * unspare the device, as we assume that the original spare was 2705 * done in response to the FMA fault. 2706 */ 2707 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2708 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2709 vd->vdev_parent->vdev_child[0] == vd) 2710 vd->vdev_unspare = B_TRUE; 2711} 2712 2713boolean_t 2714vdev_is_dead(vdev_t *vd) 2715{ 2716 /* 2717 * Holes and missing devices are always considered "dead". 2718 * This simplifies the code since we don't have to check for 2719 * these types of devices in the various code paths. 2720 * Instead we rely on the fact that we skip over dead devices 2721 * before issuing I/O to them. 2722 */ 2723 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2724 vd->vdev_ops == &vdev_missing_ops); 2725} 2726 2727boolean_t 2728vdev_readable(vdev_t *vd) 2729{ 2730 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2731} 2732 2733boolean_t 2734vdev_writeable(vdev_t *vd) 2735{ 2736 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2737} 2738 2739boolean_t 2740vdev_allocatable(vdev_t *vd) 2741{ 2742 uint64_t state = vd->vdev_state; 2743 2744 /* 2745 * We currently allow allocations from vdevs which may be in the 2746 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2747 * fails to reopen then we'll catch it later when we're holding 2748 * the proper locks. Note that we have to get the vdev state 2749 * in a local variable because although it changes atomically, 2750 * we're asking two separate questions about it. 2751 */ 2752 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2753 !vd->vdev_cant_write && !vd->vdev_ishole); 2754} 2755 2756boolean_t 2757vdev_accessible(vdev_t *vd, zio_t *zio) 2758{ 2759 ASSERT(zio->io_vd == vd); 2760 2761 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2762 return (B_FALSE); 2763 2764 if (zio->io_type == ZIO_TYPE_READ) 2765 return (!vd->vdev_cant_read); 2766 2767 if (zio->io_type == ZIO_TYPE_WRITE) 2768 return (!vd->vdev_cant_write); 2769 2770 return (B_TRUE); 2771} 2772 2773/* 2774 * Get statistics for the given vdev. 2775 */ 2776void 2777vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2778{ 2779 spa_t *spa = vd->vdev_spa; 2780 vdev_t *rvd = spa->spa_root_vdev; 2781 2782 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2783 2784 mutex_enter(&vd->vdev_stat_lock); 2785 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2786 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2787 vs->vs_state = vd->vdev_state; 2788 vs->vs_rsize = vdev_get_min_asize(vd); 2789 if (vd->vdev_ops->vdev_op_leaf) 2790 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2791 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize; 2792 vs->vs_configured_ashift = vd->vdev_top != NULL 2793 ? vd->vdev_top->vdev_ashift : vd->vdev_ashift; 2794 vs->vs_logical_ashift = vd->vdev_logical_ashift; 2795 vs->vs_physical_ashift = vd->vdev_physical_ashift; 2796 if (vd->vdev_aux == NULL && vd == vd->vdev_top && !vd->vdev_ishole) { 2797 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation; 2798 } 2799 2800 /* 2801 * If we're getting stats on the root vdev, aggregate the I/O counts 2802 * over all top-level vdevs (i.e. the direct children of the root). 2803 */ 2804 if (vd == rvd) { 2805 for (int c = 0; c < rvd->vdev_children; c++) { 2806 vdev_t *cvd = rvd->vdev_child[c]; 2807 vdev_stat_t *cvs = &cvd->vdev_stat; 2808 2809 for (int t = 0; t < ZIO_TYPES; t++) { 2810 vs->vs_ops[t] += cvs->vs_ops[t]; 2811 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2812 } 2813 cvs->vs_scan_removing = cvd->vdev_removing; 2814 } 2815 } 2816 mutex_exit(&vd->vdev_stat_lock); 2817} 2818 2819void 2820vdev_clear_stats(vdev_t *vd) 2821{ 2822 mutex_enter(&vd->vdev_stat_lock); 2823 vd->vdev_stat.vs_space = 0; 2824 vd->vdev_stat.vs_dspace = 0; 2825 vd->vdev_stat.vs_alloc = 0; 2826 mutex_exit(&vd->vdev_stat_lock); 2827} 2828 2829void 2830vdev_scan_stat_init(vdev_t *vd) 2831{ 2832 vdev_stat_t *vs = &vd->vdev_stat; 2833 2834 for (int c = 0; c < vd->vdev_children; c++) 2835 vdev_scan_stat_init(vd->vdev_child[c]); 2836 2837 mutex_enter(&vd->vdev_stat_lock); 2838 vs->vs_scan_processed = 0; 2839 mutex_exit(&vd->vdev_stat_lock); 2840} 2841 2842void 2843vdev_stat_update(zio_t *zio, uint64_t psize) 2844{ 2845 spa_t *spa = zio->io_spa; 2846 vdev_t *rvd = spa->spa_root_vdev; 2847 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2848 vdev_t *pvd; 2849 uint64_t txg = zio->io_txg; 2850 vdev_stat_t *vs = &vd->vdev_stat; 2851 zio_type_t type = zio->io_type; 2852 int flags = zio->io_flags; 2853 2854 /* 2855 * If this i/o is a gang leader, it didn't do any actual work. 2856 */ 2857 if (zio->io_gang_tree) 2858 return; 2859 2860 if (zio->io_error == 0) { 2861 /* 2862 * If this is a root i/o, don't count it -- we've already 2863 * counted the top-level vdevs, and vdev_get_stats() will 2864 * aggregate them when asked. This reduces contention on 2865 * the root vdev_stat_lock and implicitly handles blocks 2866 * that compress away to holes, for which there is no i/o. 2867 * (Holes never create vdev children, so all the counters 2868 * remain zero, which is what we want.) 2869 * 2870 * Note: this only applies to successful i/o (io_error == 0) 2871 * because unlike i/o counts, errors are not additive. 2872 * When reading a ditto block, for example, failure of 2873 * one top-level vdev does not imply a root-level error. 2874 */ 2875 if (vd == rvd) 2876 return; 2877 2878 ASSERT(vd == zio->io_vd); 2879 2880 if (flags & ZIO_FLAG_IO_BYPASS) 2881 return; 2882 2883 mutex_enter(&vd->vdev_stat_lock); 2884 2885 if (flags & ZIO_FLAG_IO_REPAIR) { 2886 if (flags & ZIO_FLAG_SCAN_THREAD) { 2887 dsl_scan_phys_t *scn_phys = 2888 &spa->spa_dsl_pool->dp_scan->scn_phys; 2889 uint64_t *processed = &scn_phys->scn_processed; 2890 2891 /* XXX cleanup? */ 2892 if (vd->vdev_ops->vdev_op_leaf) 2893 atomic_add_64(processed, psize); 2894 vs->vs_scan_processed += psize; 2895 } 2896 2897 if (flags & ZIO_FLAG_SELF_HEAL) 2898 vs->vs_self_healed += psize; 2899 } 2900 2901 vs->vs_ops[type]++; 2902 vs->vs_bytes[type] += psize; 2903 2904 mutex_exit(&vd->vdev_stat_lock); 2905 return; 2906 } 2907 2908 if (flags & ZIO_FLAG_SPECULATIVE) 2909 return; 2910 2911 /* 2912 * If this is an I/O error that is going to be retried, then ignore the 2913 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2914 * hard errors, when in reality they can happen for any number of 2915 * innocuous reasons (bus resets, MPxIO link failure, etc). 2916 */ 2917 if (zio->io_error == EIO && 2918 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2919 return; 2920 2921 /* 2922 * Intent logs writes won't propagate their error to the root 2923 * I/O so don't mark these types of failures as pool-level 2924 * errors. 2925 */ 2926 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2927 return; 2928 2929 mutex_enter(&vd->vdev_stat_lock); 2930 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2931 if (zio->io_error == ECKSUM) 2932 vs->vs_checksum_errors++; 2933 else 2934 vs->vs_read_errors++; 2935 } 2936 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2937 vs->vs_write_errors++; 2938 mutex_exit(&vd->vdev_stat_lock); 2939 2940 if (type == ZIO_TYPE_WRITE && txg != 0 && 2941 (!(flags & ZIO_FLAG_IO_REPAIR) || 2942 (flags & ZIO_FLAG_SCAN_THREAD) || 2943 spa->spa_claiming)) { 2944 /* 2945 * This is either a normal write (not a repair), or it's 2946 * a repair induced by the scrub thread, or it's a repair 2947 * made by zil_claim() during spa_load() in the first txg. 2948 * In the normal case, we commit the DTL change in the same 2949 * txg as the block was born. In the scrub-induced repair 2950 * case, we know that scrubs run in first-pass syncing context, 2951 * so we commit the DTL change in spa_syncing_txg(spa). 2952 * In the zil_claim() case, we commit in spa_first_txg(spa). 2953 * 2954 * We currently do not make DTL entries for failed spontaneous 2955 * self-healing writes triggered by normal (non-scrubbing) 2956 * reads, because we have no transactional context in which to 2957 * do so -- and it's not clear that it'd be desirable anyway. 2958 */ 2959 if (vd->vdev_ops->vdev_op_leaf) { 2960 uint64_t commit_txg = txg; 2961 if (flags & ZIO_FLAG_SCAN_THREAD) { 2962 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2963 ASSERT(spa_sync_pass(spa) == 1); 2964 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 2965 commit_txg = spa_syncing_txg(spa); 2966 } else if (spa->spa_claiming) { 2967 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2968 commit_txg = spa_first_txg(spa); 2969 } 2970 ASSERT(commit_txg >= spa_syncing_txg(spa)); 2971 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 2972 return; 2973 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2974 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 2975 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 2976 } 2977 if (vd != rvd) 2978 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 2979 } 2980} 2981 2982/* 2983 * Update the in-core space usage stats for this vdev, its metaslab class, 2984 * and the root vdev. 2985 */ 2986void 2987vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 2988 int64_t space_delta) 2989{ 2990 int64_t dspace_delta = space_delta; 2991 spa_t *spa = vd->vdev_spa; 2992 vdev_t *rvd = spa->spa_root_vdev; 2993 metaslab_group_t *mg = vd->vdev_mg; 2994 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 2995 2996 ASSERT(vd == vd->vdev_top); 2997 2998 /* 2999 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 3000 * factor. We must calculate this here and not at the root vdev 3001 * because the root vdev's psize-to-asize is simply the max of its 3002 * childrens', thus not accurate enough for us. 3003 */ 3004 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 3005 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 3006 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 3007 vd->vdev_deflate_ratio; 3008 3009 mutex_enter(&vd->vdev_stat_lock); 3010 vd->vdev_stat.vs_alloc += alloc_delta; 3011 vd->vdev_stat.vs_space += space_delta; 3012 vd->vdev_stat.vs_dspace += dspace_delta; 3013 mutex_exit(&vd->vdev_stat_lock); 3014 3015 if (mc == spa_normal_class(spa)) { 3016 mutex_enter(&rvd->vdev_stat_lock); 3017 rvd->vdev_stat.vs_alloc += alloc_delta; 3018 rvd->vdev_stat.vs_space += space_delta; 3019 rvd->vdev_stat.vs_dspace += dspace_delta; 3020 mutex_exit(&rvd->vdev_stat_lock); 3021 } 3022 3023 if (mc != NULL) { 3024 ASSERT(rvd == vd->vdev_parent); 3025 ASSERT(vd->vdev_ms_count != 0); 3026 3027 metaslab_class_space_update(mc, 3028 alloc_delta, defer_delta, space_delta, dspace_delta); 3029 } 3030} 3031 3032/* 3033 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3034 * so that it will be written out next time the vdev configuration is synced. 3035 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3036 */ 3037void 3038vdev_config_dirty(vdev_t *vd) 3039{ 3040 spa_t *spa = vd->vdev_spa; 3041 vdev_t *rvd = spa->spa_root_vdev; 3042 int c; 3043 3044 ASSERT(spa_writeable(spa)); 3045 3046 /* 3047 * If this is an aux vdev (as with l2cache and spare devices), then we 3048 * update the vdev config manually and set the sync flag. 3049 */ 3050 if (vd->vdev_aux != NULL) { 3051 spa_aux_vdev_t *sav = vd->vdev_aux; 3052 nvlist_t **aux; 3053 uint_t naux; 3054 3055 for (c = 0; c < sav->sav_count; c++) { 3056 if (sav->sav_vdevs[c] == vd) 3057 break; 3058 } 3059 3060 if (c == sav->sav_count) { 3061 /* 3062 * We're being removed. There's nothing more to do. 3063 */ 3064 ASSERT(sav->sav_sync == B_TRUE); 3065 return; 3066 } 3067 3068 sav->sav_sync = B_TRUE; 3069 3070 if (nvlist_lookup_nvlist_array(sav->sav_config, 3071 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3072 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3073 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3074 } 3075 3076 ASSERT(c < naux); 3077 3078 /* 3079 * Setting the nvlist in the middle if the array is a little 3080 * sketchy, but it will work. 3081 */ 3082 nvlist_free(aux[c]); 3083 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3084 3085 return; 3086 } 3087 3088 /* 3089 * The dirty list is protected by the SCL_CONFIG lock. The caller 3090 * must either hold SCL_CONFIG as writer, or must be the sync thread 3091 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3092 * so this is sufficient to ensure mutual exclusion. 3093 */ 3094 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3095 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3096 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3097 3098 if (vd == rvd) { 3099 for (c = 0; c < rvd->vdev_children; c++) 3100 vdev_config_dirty(rvd->vdev_child[c]); 3101 } else { 3102 ASSERT(vd == vd->vdev_top); 3103 3104 if (!list_link_active(&vd->vdev_config_dirty_node) && 3105 !vd->vdev_ishole) 3106 list_insert_head(&spa->spa_config_dirty_list, vd); 3107 } 3108} 3109 3110void 3111vdev_config_clean(vdev_t *vd) 3112{ 3113 spa_t *spa = vd->vdev_spa; 3114 3115 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3116 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3117 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3118 3119 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3120 list_remove(&spa->spa_config_dirty_list, vd); 3121} 3122 3123/* 3124 * Mark a top-level vdev's state as dirty, so that the next pass of 3125 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3126 * the state changes from larger config changes because they require 3127 * much less locking, and are often needed for administrative actions. 3128 */ 3129void 3130vdev_state_dirty(vdev_t *vd) 3131{ 3132 spa_t *spa = vd->vdev_spa; 3133 3134 ASSERT(spa_writeable(spa)); 3135 ASSERT(vd == vd->vdev_top); 3136 3137 /* 3138 * The state list is protected by the SCL_STATE lock. The caller 3139 * must either hold SCL_STATE as writer, or must be the sync thread 3140 * (which holds SCL_STATE as reader). There's only one sync thread, 3141 * so this is sufficient to ensure mutual exclusion. 3142 */ 3143 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3144 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3145 spa_config_held(spa, SCL_STATE, RW_READER))); 3146 3147 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 3148 list_insert_head(&spa->spa_state_dirty_list, vd); 3149} 3150 3151void 3152vdev_state_clean(vdev_t *vd) 3153{ 3154 spa_t *spa = vd->vdev_spa; 3155 3156 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3157 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3158 spa_config_held(spa, SCL_STATE, RW_READER))); 3159 3160 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3161 list_remove(&spa->spa_state_dirty_list, vd); 3162} 3163 3164/* 3165 * Propagate vdev state up from children to parent. 3166 */ 3167void 3168vdev_propagate_state(vdev_t *vd) 3169{ 3170 spa_t *spa = vd->vdev_spa; 3171 vdev_t *rvd = spa->spa_root_vdev; 3172 int degraded = 0, faulted = 0; 3173 int corrupted = 0; 3174 vdev_t *child; 3175 3176 if (vd->vdev_children > 0) { 3177 for (int c = 0; c < vd->vdev_children; c++) { 3178 child = vd->vdev_child[c]; 3179 3180 /* 3181 * Don't factor holes into the decision. 3182 */ 3183 if (child->vdev_ishole) 3184 continue; 3185 3186 if (!vdev_readable(child) || 3187 (!vdev_writeable(child) && spa_writeable(spa))) { 3188 /* 3189 * Root special: if there is a top-level log 3190 * device, treat the root vdev as if it were 3191 * degraded. 3192 */ 3193 if (child->vdev_islog && vd == rvd) 3194 degraded++; 3195 else 3196 faulted++; 3197 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3198 degraded++; 3199 } 3200 3201 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3202 corrupted++; 3203 } 3204 3205 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3206 3207 /* 3208 * Root special: if there is a top-level vdev that cannot be 3209 * opened due to corrupted metadata, then propagate the root 3210 * vdev's aux state as 'corrupt' rather than 'insufficient 3211 * replicas'. 3212 */ 3213 if (corrupted && vd == rvd && 3214 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3215 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3216 VDEV_AUX_CORRUPT_DATA); 3217 } 3218 3219 if (vd->vdev_parent) 3220 vdev_propagate_state(vd->vdev_parent); 3221} 3222 3223/* 3224 * Set a vdev's state. If this is during an open, we don't update the parent 3225 * state, because we're in the process of opening children depth-first. 3226 * Otherwise, we propagate the change to the parent. 3227 * 3228 * If this routine places a device in a faulted state, an appropriate ereport is 3229 * generated. 3230 */ 3231void 3232vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 3233{ 3234 uint64_t save_state; 3235 spa_t *spa = vd->vdev_spa; 3236 3237 if (state == vd->vdev_state) { 3238 vd->vdev_stat.vs_aux = aux; 3239 return; 3240 } 3241 3242 save_state = vd->vdev_state; 3243 3244 vd->vdev_state = state; 3245 vd->vdev_stat.vs_aux = aux; 3246 3247 /* 3248 * If we are setting the vdev state to anything but an open state, then 3249 * always close the underlying device unless the device has requested 3250 * a delayed close (i.e. we're about to remove or fault the device). 3251 * Otherwise, we keep accessible but invalid devices open forever. 3252 * We don't call vdev_close() itself, because that implies some extra 3253 * checks (offline, etc) that we don't want here. This is limited to 3254 * leaf devices, because otherwise closing the device will affect other 3255 * children. 3256 */ 3257 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 3258 vd->vdev_ops->vdev_op_leaf) 3259 vd->vdev_ops->vdev_op_close(vd); 3260 3261 /* 3262 * If we have brought this vdev back into service, we need 3263 * to notify fmd so that it can gracefully repair any outstanding 3264 * cases due to a missing device. We do this in all cases, even those 3265 * that probably don't correlate to a repaired fault. This is sure to 3266 * catch all cases, and we let the zfs-retire agent sort it out. If 3267 * this is a transient state it's OK, as the retire agent will 3268 * double-check the state of the vdev before repairing it. 3269 */ 3270 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 3271 vd->vdev_prevstate != state) 3272 zfs_post_state_change(spa, vd); 3273 3274 if (vd->vdev_removed && 3275 state == VDEV_STATE_CANT_OPEN && 3276 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 3277 /* 3278 * If the previous state is set to VDEV_STATE_REMOVED, then this 3279 * device was previously marked removed and someone attempted to 3280 * reopen it. If this failed due to a nonexistent device, then 3281 * keep the device in the REMOVED state. We also let this be if 3282 * it is one of our special test online cases, which is only 3283 * attempting to online the device and shouldn't generate an FMA 3284 * fault. 3285 */ 3286 vd->vdev_state = VDEV_STATE_REMOVED; 3287 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 3288 } else if (state == VDEV_STATE_REMOVED) { 3289 vd->vdev_removed = B_TRUE; 3290 } else if (state == VDEV_STATE_CANT_OPEN) { 3291 /* 3292 * If we fail to open a vdev during an import or recovery, we 3293 * mark it as "not available", which signifies that it was 3294 * never there to begin with. Failure to open such a device 3295 * is not considered an error. 3296 */ 3297 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 3298 spa_load_state(spa) == SPA_LOAD_RECOVER) && 3299 vd->vdev_ops->vdev_op_leaf) 3300 vd->vdev_not_present = 1; 3301 3302 /* 3303 * Post the appropriate ereport. If the 'prevstate' field is 3304 * set to something other than VDEV_STATE_UNKNOWN, it indicates 3305 * that this is part of a vdev_reopen(). In this case, we don't 3306 * want to post the ereport if the device was already in the 3307 * CANT_OPEN state beforehand. 3308 * 3309 * If the 'checkremove' flag is set, then this is an attempt to 3310 * online the device in response to an insertion event. If we 3311 * hit this case, then we have detected an insertion event for a 3312 * faulted or offline device that wasn't in the removed state. 3313 * In this scenario, we don't post an ereport because we are 3314 * about to replace the device, or attempt an online with 3315 * vdev_forcefault, which will generate the fault for us. 3316 */ 3317 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 3318 !vd->vdev_not_present && !vd->vdev_checkremove && 3319 vd != spa->spa_root_vdev) { 3320 const char *class; 3321 3322 switch (aux) { 3323 case VDEV_AUX_OPEN_FAILED: 3324 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 3325 break; 3326 case VDEV_AUX_CORRUPT_DATA: 3327 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3328 break; 3329 case VDEV_AUX_NO_REPLICAS: 3330 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3331 break; 3332 case VDEV_AUX_BAD_GUID_SUM: 3333 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3334 break; 3335 case VDEV_AUX_TOO_SMALL: 3336 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3337 break; 3338 case VDEV_AUX_BAD_LABEL: 3339 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3340 break; 3341 default: 3342 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3343 } 3344 3345 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3346 } 3347 3348 /* Erase any notion of persistent removed state */ 3349 vd->vdev_removed = B_FALSE; 3350 } else { 3351 vd->vdev_removed = B_FALSE; 3352 } 3353 3354 if (!isopen && vd->vdev_parent) 3355 vdev_propagate_state(vd->vdev_parent); 3356} 3357 3358/* 3359 * Check the vdev configuration to ensure that it's capable of supporting 3360 * a root pool. 3361 * 3362 * On Solaris, we do not support RAID-Z or partial configuration. In 3363 * addition, only a single top-level vdev is allowed and none of the 3364 * leaves can be wholedisks. 3365 * 3366 * For FreeBSD, we can boot from any configuration. There is a 3367 * limitation that the boot filesystem must be either uncompressed or 3368 * compresses with lzjb compression but I'm not sure how to enforce 3369 * that here. 3370 */ 3371boolean_t 3372vdev_is_bootable(vdev_t *vd) 3373{ 3374#ifdef sun 3375 if (!vd->vdev_ops->vdev_op_leaf) { 3376 char *vdev_type = vd->vdev_ops->vdev_op_type; 3377 3378 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3379 vd->vdev_children > 1) { 3380 return (B_FALSE); 3381 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3382 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3383 return (B_FALSE); 3384 } 3385 } else if (vd->vdev_wholedisk == 1) { 3386 return (B_FALSE); 3387 } 3388 3389 for (int c = 0; c < vd->vdev_children; c++) { 3390 if (!vdev_is_bootable(vd->vdev_child[c])) 3391 return (B_FALSE); 3392 } 3393#endif /* sun */ 3394 return (B_TRUE); 3395} 3396 3397/* 3398 * Load the state from the original vdev tree (ovd) which 3399 * we've retrieved from the MOS config object. If the original 3400 * vdev was offline or faulted then we transfer that state to the 3401 * device in the current vdev tree (nvd). 3402 */ 3403void 3404vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3405{ 3406 spa_t *spa = nvd->vdev_spa; 3407 3408 ASSERT(nvd->vdev_top->vdev_islog); 3409 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3410 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3411 3412 for (int c = 0; c < nvd->vdev_children; c++) 3413 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3414 3415 if (nvd->vdev_ops->vdev_op_leaf) { 3416 /* 3417 * Restore the persistent vdev state 3418 */ 3419 nvd->vdev_offline = ovd->vdev_offline; 3420 nvd->vdev_faulted = ovd->vdev_faulted; 3421 nvd->vdev_degraded = ovd->vdev_degraded; 3422 nvd->vdev_removed = ovd->vdev_removed; 3423 } 3424} 3425 3426/* 3427 * Determine if a log device has valid content. If the vdev was 3428 * removed or faulted in the MOS config then we know that 3429 * the content on the log device has already been written to the pool. 3430 */ 3431boolean_t 3432vdev_log_state_valid(vdev_t *vd) 3433{ 3434 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3435 !vd->vdev_removed) 3436 return (B_TRUE); 3437 3438 for (int c = 0; c < vd->vdev_children; c++) 3439 if (vdev_log_state_valid(vd->vdev_child[c])) 3440 return (B_TRUE); 3441 3442 return (B_FALSE); 3443} 3444 3445/* 3446 * Expand a vdev if possible. 3447 */ 3448void 3449vdev_expand(vdev_t *vd, uint64_t txg) 3450{ 3451 ASSERT(vd->vdev_top == vd); 3452 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3453 3454 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3455 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3456 vdev_config_dirty(vd); 3457 } 3458} 3459 3460/* 3461 * Split a vdev. 3462 */ 3463void 3464vdev_split(vdev_t *vd) 3465{ 3466 vdev_t *cvd, *pvd = vd->vdev_parent; 3467 3468 vdev_remove_child(pvd, vd); 3469 vdev_compact_children(pvd); 3470 3471 cvd = pvd->vdev_child[0]; 3472 if (pvd->vdev_children == 1) { 3473 vdev_remove_parent(cvd); 3474 cvd->vdev_splitting = B_TRUE; 3475 } 3476 vdev_propagate_state(cvd); 3477} 3478 3479void 3480vdev_deadman(vdev_t *vd) 3481{ 3482 for (int c = 0; c < vd->vdev_children; c++) { 3483 vdev_t *cvd = vd->vdev_child[c]; 3484 3485 vdev_deadman(cvd); 3486 } 3487 3488 if (vd->vdev_ops->vdev_op_leaf) { 3489 vdev_queue_t *vq = &vd->vdev_queue; 3490 3491 mutex_enter(&vq->vq_lock); 3492 if (avl_numnodes(&vq->vq_active_tree) > 0) { 3493 spa_t *spa = vd->vdev_spa; 3494 zio_t *fio; 3495 uint64_t delta; 3496 3497 /* 3498 * Look at the head of all the pending queues, 3499 * if any I/O has been outstanding for longer than 3500 * the spa_deadman_synctime we panic the system. 3501 */ 3502 fio = avl_first(&vq->vq_active_tree); 3503 delta = gethrtime() - fio->io_timestamp; 3504 if (delta > spa_deadman_synctime(spa)) { 3505 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, " 3506 "delta %lluns, last io %lluns", 3507 fio->io_timestamp, delta, 3508 vq->vq_io_complete_ts); 3509 fm_panic("I/O to pool '%s' appears to be " 3510 "hung on vdev guid %llu at '%s'.", 3511 spa_name(spa), 3512 (long long unsigned int) vd->vdev_guid, 3513 vd->vdev_path); 3514 } 3515 } 3516 mutex_exit(&vq->vq_lock); 3517 } 3518} 3519