vdev.c revision 273343
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 26 * Copyright 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 */ 28 29#include <sys/zfs_context.h> 30#include <sys/fm/fs/zfs.h> 31#include <sys/spa.h> 32#include <sys/spa_impl.h> 33#include <sys/dmu.h> 34#include <sys/dmu_tx.h> 35#include <sys/vdev_impl.h> 36#include <sys/uberblock_impl.h> 37#include <sys/metaslab.h> 38#include <sys/metaslab_impl.h> 39#include <sys/space_map.h> 40#include <sys/space_reftree.h> 41#include <sys/zio.h> 42#include <sys/zap.h> 43#include <sys/fs/zfs.h> 44#include <sys/arc.h> 45#include <sys/zil.h> 46#include <sys/dsl_scan.h> 47#include <sys/trim_map.h> 48 49SYSCTL_DECL(_vfs_zfs); 50SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 51 52/* 53 * Virtual device management. 54 */ 55 56/* 57 * The limit for ZFS to automatically increase a top-level vdev's ashift 58 * from logical ashift to physical ashift. 59 * 60 * Example: one or more 512B emulation child vdevs 61 * child->vdev_ashift = 9 (512 bytes) 62 * child->vdev_physical_ashift = 12 (4096 bytes) 63 * zfs_max_auto_ashift = 11 (2048 bytes) 64 * zfs_min_auto_ashift = 9 (512 bytes) 65 * 66 * On pool creation or the addition of a new top-level vdev, ZFS will 67 * increase the ashift of the top-level vdev to 2048 as limited by 68 * zfs_max_auto_ashift. 69 * 70 * Example: one or more 512B emulation child vdevs 71 * child->vdev_ashift = 9 (512 bytes) 72 * child->vdev_physical_ashift = 12 (4096 bytes) 73 * zfs_max_auto_ashift = 13 (8192 bytes) 74 * zfs_min_auto_ashift = 9 (512 bytes) 75 * 76 * On pool creation or the addition of a new top-level vdev, ZFS will 77 * increase the ashift of the top-level vdev to 4096 to match the 78 * max vdev_physical_ashift. 79 * 80 * Example: one or more 512B emulation child vdevs 81 * child->vdev_ashift = 9 (512 bytes) 82 * child->vdev_physical_ashift = 9 (512 bytes) 83 * zfs_max_auto_ashift = 13 (8192 bytes) 84 * zfs_min_auto_ashift = 12 (4096 bytes) 85 * 86 * On pool creation or the addition of a new top-level vdev, ZFS will 87 * increase the ashift of the top-level vdev to 4096 to match the 88 * zfs_min_auto_ashift. 89 */ 90static uint64_t zfs_max_auto_ashift = SPA_MAXASHIFT; 91static uint64_t zfs_min_auto_ashift = SPA_MINASHIFT; 92 93static int 94sysctl_vfs_zfs_max_auto_ashift(SYSCTL_HANDLER_ARGS) 95{ 96 uint64_t val; 97 int err; 98 99 val = zfs_max_auto_ashift; 100 err = sysctl_handle_64(oidp, &val, 0, req); 101 if (err != 0 || req->newptr == NULL) 102 return (err); 103 104 if (val > SPA_MAXASHIFT || val < zfs_min_auto_ashift) 105 return (EINVAL); 106 107 zfs_max_auto_ashift = val; 108 109 return (0); 110} 111SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift, 112 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 113 sysctl_vfs_zfs_max_auto_ashift, "QU", 114 "Max ashift used when optimising for logical -> physical sectors size on " 115 "new top-level vdevs."); 116 117static int 118sysctl_vfs_zfs_min_auto_ashift(SYSCTL_HANDLER_ARGS) 119{ 120 uint64_t val; 121 int err; 122 123 val = zfs_min_auto_ashift; 124 err = sysctl_handle_64(oidp, &val, 0, req); 125 if (err != 0 || req->newptr == NULL) 126 return (err); 127 128 if (val < SPA_MINASHIFT || val > zfs_max_auto_ashift) 129 return (EINVAL); 130 131 zfs_min_auto_ashift = val; 132 133 return (0); 134} 135SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift, 136 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 137 sysctl_vfs_zfs_min_auto_ashift, "QU", 138 "Min ashift used when creating new top-level vdevs."); 139 140static vdev_ops_t *vdev_ops_table[] = { 141 &vdev_root_ops, 142 &vdev_raidz_ops, 143 &vdev_mirror_ops, 144 &vdev_replacing_ops, 145 &vdev_spare_ops, 146#ifdef _KERNEL 147 &vdev_geom_ops, 148#else 149 &vdev_disk_ops, 150#endif 151 &vdev_file_ops, 152 &vdev_missing_ops, 153 &vdev_hole_ops, 154 NULL 155}; 156 157 158/* 159 * When a vdev is added, it will be divided into approximately (but no 160 * more than) this number of metaslabs. 161 */ 162int metaslabs_per_vdev = 200; 163SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, metaslabs_per_vdev, CTLFLAG_RDTUN, 164 &metaslabs_per_vdev, 0, 165 "When a vdev is added, how many metaslabs the vdev should be divided into"); 166 167/* 168 * Given a vdev type, return the appropriate ops vector. 169 */ 170static vdev_ops_t * 171vdev_getops(const char *type) 172{ 173 vdev_ops_t *ops, **opspp; 174 175 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 176 if (strcmp(ops->vdev_op_type, type) == 0) 177 break; 178 179 return (ops); 180} 181 182/* 183 * Default asize function: return the MAX of psize with the asize of 184 * all children. This is what's used by anything other than RAID-Z. 185 */ 186uint64_t 187vdev_default_asize(vdev_t *vd, uint64_t psize) 188{ 189 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 190 uint64_t csize; 191 192 for (int c = 0; c < vd->vdev_children; c++) { 193 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 194 asize = MAX(asize, csize); 195 } 196 197 return (asize); 198} 199 200/* 201 * Get the minimum allocatable size. We define the allocatable size as 202 * the vdev's asize rounded to the nearest metaslab. This allows us to 203 * replace or attach devices which don't have the same physical size but 204 * can still satisfy the same number of allocations. 205 */ 206uint64_t 207vdev_get_min_asize(vdev_t *vd) 208{ 209 vdev_t *pvd = vd->vdev_parent; 210 211 /* 212 * If our parent is NULL (inactive spare or cache) or is the root, 213 * just return our own asize. 214 */ 215 if (pvd == NULL) 216 return (vd->vdev_asize); 217 218 /* 219 * The top-level vdev just returns the allocatable size rounded 220 * to the nearest metaslab. 221 */ 222 if (vd == vd->vdev_top) 223 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 224 225 /* 226 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 227 * so each child must provide at least 1/Nth of its asize. 228 */ 229 if (pvd->vdev_ops == &vdev_raidz_ops) 230 return (pvd->vdev_min_asize / pvd->vdev_children); 231 232 return (pvd->vdev_min_asize); 233} 234 235void 236vdev_set_min_asize(vdev_t *vd) 237{ 238 vd->vdev_min_asize = vdev_get_min_asize(vd); 239 240 for (int c = 0; c < vd->vdev_children; c++) 241 vdev_set_min_asize(vd->vdev_child[c]); 242} 243 244vdev_t * 245vdev_lookup_top(spa_t *spa, uint64_t vdev) 246{ 247 vdev_t *rvd = spa->spa_root_vdev; 248 249 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 250 251 if (vdev < rvd->vdev_children) { 252 ASSERT(rvd->vdev_child[vdev] != NULL); 253 return (rvd->vdev_child[vdev]); 254 } 255 256 return (NULL); 257} 258 259vdev_t * 260vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 261{ 262 vdev_t *mvd; 263 264 if (vd->vdev_guid == guid) 265 return (vd); 266 267 for (int c = 0; c < vd->vdev_children; c++) 268 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 269 NULL) 270 return (mvd); 271 272 return (NULL); 273} 274 275void 276vdev_add_child(vdev_t *pvd, vdev_t *cvd) 277{ 278 size_t oldsize, newsize; 279 uint64_t id = cvd->vdev_id; 280 vdev_t **newchild; 281 282 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 283 ASSERT(cvd->vdev_parent == NULL); 284 285 cvd->vdev_parent = pvd; 286 287 if (pvd == NULL) 288 return; 289 290 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 291 292 oldsize = pvd->vdev_children * sizeof (vdev_t *); 293 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 294 newsize = pvd->vdev_children * sizeof (vdev_t *); 295 296 newchild = kmem_zalloc(newsize, KM_SLEEP); 297 if (pvd->vdev_child != NULL) { 298 bcopy(pvd->vdev_child, newchild, oldsize); 299 kmem_free(pvd->vdev_child, oldsize); 300 } 301 302 pvd->vdev_child = newchild; 303 pvd->vdev_child[id] = cvd; 304 305 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 306 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 307 308 /* 309 * Walk up all ancestors to update guid sum. 310 */ 311 for (; pvd != NULL; pvd = pvd->vdev_parent) 312 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 313} 314 315void 316vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 317{ 318 int c; 319 uint_t id = cvd->vdev_id; 320 321 ASSERT(cvd->vdev_parent == pvd); 322 323 if (pvd == NULL) 324 return; 325 326 ASSERT(id < pvd->vdev_children); 327 ASSERT(pvd->vdev_child[id] == cvd); 328 329 pvd->vdev_child[id] = NULL; 330 cvd->vdev_parent = NULL; 331 332 for (c = 0; c < pvd->vdev_children; c++) 333 if (pvd->vdev_child[c]) 334 break; 335 336 if (c == pvd->vdev_children) { 337 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 338 pvd->vdev_child = NULL; 339 pvd->vdev_children = 0; 340 } 341 342 /* 343 * Walk up all ancestors to update guid sum. 344 */ 345 for (; pvd != NULL; pvd = pvd->vdev_parent) 346 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 347} 348 349/* 350 * Remove any holes in the child array. 351 */ 352void 353vdev_compact_children(vdev_t *pvd) 354{ 355 vdev_t **newchild, *cvd; 356 int oldc = pvd->vdev_children; 357 int newc; 358 359 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 360 361 for (int c = newc = 0; c < oldc; c++) 362 if (pvd->vdev_child[c]) 363 newc++; 364 365 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 366 367 for (int c = newc = 0; c < oldc; c++) { 368 if ((cvd = pvd->vdev_child[c]) != NULL) { 369 newchild[newc] = cvd; 370 cvd->vdev_id = newc++; 371 } 372 } 373 374 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 375 pvd->vdev_child = newchild; 376 pvd->vdev_children = newc; 377} 378 379/* 380 * Allocate and minimally initialize a vdev_t. 381 */ 382vdev_t * 383vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 384{ 385 vdev_t *vd; 386 387 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 388 389 if (spa->spa_root_vdev == NULL) { 390 ASSERT(ops == &vdev_root_ops); 391 spa->spa_root_vdev = vd; 392 spa->spa_load_guid = spa_generate_guid(NULL); 393 } 394 395 if (guid == 0 && ops != &vdev_hole_ops) { 396 if (spa->spa_root_vdev == vd) { 397 /* 398 * The root vdev's guid will also be the pool guid, 399 * which must be unique among all pools. 400 */ 401 guid = spa_generate_guid(NULL); 402 } else { 403 /* 404 * Any other vdev's guid must be unique within the pool. 405 */ 406 guid = spa_generate_guid(spa); 407 } 408 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 409 } 410 411 vd->vdev_spa = spa; 412 vd->vdev_id = id; 413 vd->vdev_guid = guid; 414 vd->vdev_guid_sum = guid; 415 vd->vdev_ops = ops; 416 vd->vdev_state = VDEV_STATE_CLOSED; 417 vd->vdev_ishole = (ops == &vdev_hole_ops); 418 419 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 420 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 421 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 422 for (int t = 0; t < DTL_TYPES; t++) { 423 vd->vdev_dtl[t] = range_tree_create(NULL, NULL, 424 &vd->vdev_dtl_lock); 425 } 426 txg_list_create(&vd->vdev_ms_list, 427 offsetof(struct metaslab, ms_txg_node)); 428 txg_list_create(&vd->vdev_dtl_list, 429 offsetof(struct vdev, vdev_dtl_node)); 430 vd->vdev_stat.vs_timestamp = gethrtime(); 431 vdev_queue_init(vd); 432 vdev_cache_init(vd); 433 434 return (vd); 435} 436 437/* 438 * Allocate a new vdev. The 'alloctype' is used to control whether we are 439 * creating a new vdev or loading an existing one - the behavior is slightly 440 * different for each case. 441 */ 442int 443vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 444 int alloctype) 445{ 446 vdev_ops_t *ops; 447 char *type; 448 uint64_t guid = 0, islog, nparity; 449 vdev_t *vd; 450 451 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 452 453 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 454 return (SET_ERROR(EINVAL)); 455 456 if ((ops = vdev_getops(type)) == NULL) 457 return (SET_ERROR(EINVAL)); 458 459 /* 460 * If this is a load, get the vdev guid from the nvlist. 461 * Otherwise, vdev_alloc_common() will generate one for us. 462 */ 463 if (alloctype == VDEV_ALLOC_LOAD) { 464 uint64_t label_id; 465 466 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 467 label_id != id) 468 return (SET_ERROR(EINVAL)); 469 470 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 471 return (SET_ERROR(EINVAL)); 472 } else if (alloctype == VDEV_ALLOC_SPARE) { 473 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 474 return (SET_ERROR(EINVAL)); 475 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 476 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 477 return (SET_ERROR(EINVAL)); 478 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 479 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 480 return (SET_ERROR(EINVAL)); 481 } 482 483 /* 484 * The first allocated vdev must be of type 'root'. 485 */ 486 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 487 return (SET_ERROR(EINVAL)); 488 489 /* 490 * Determine whether we're a log vdev. 491 */ 492 islog = 0; 493 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 494 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 495 return (SET_ERROR(ENOTSUP)); 496 497 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 498 return (SET_ERROR(ENOTSUP)); 499 500 /* 501 * Set the nparity property for RAID-Z vdevs. 502 */ 503 nparity = -1ULL; 504 if (ops == &vdev_raidz_ops) { 505 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 506 &nparity) == 0) { 507 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 508 return (SET_ERROR(EINVAL)); 509 /* 510 * Previous versions could only support 1 or 2 parity 511 * device. 512 */ 513 if (nparity > 1 && 514 spa_version(spa) < SPA_VERSION_RAIDZ2) 515 return (SET_ERROR(ENOTSUP)); 516 if (nparity > 2 && 517 spa_version(spa) < SPA_VERSION_RAIDZ3) 518 return (SET_ERROR(ENOTSUP)); 519 } else { 520 /* 521 * We require the parity to be specified for SPAs that 522 * support multiple parity levels. 523 */ 524 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 525 return (SET_ERROR(EINVAL)); 526 /* 527 * Otherwise, we default to 1 parity device for RAID-Z. 528 */ 529 nparity = 1; 530 } 531 } else { 532 nparity = 0; 533 } 534 ASSERT(nparity != -1ULL); 535 536 vd = vdev_alloc_common(spa, id, guid, ops); 537 538 vd->vdev_islog = islog; 539 vd->vdev_nparity = nparity; 540 541 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 542 vd->vdev_path = spa_strdup(vd->vdev_path); 543 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 544 vd->vdev_devid = spa_strdup(vd->vdev_devid); 545 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 546 &vd->vdev_physpath) == 0) 547 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 548 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 549 vd->vdev_fru = spa_strdup(vd->vdev_fru); 550 551 /* 552 * Set the whole_disk property. If it's not specified, leave the value 553 * as -1. 554 */ 555 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 556 &vd->vdev_wholedisk) != 0) 557 vd->vdev_wholedisk = -1ULL; 558 559 /* 560 * Look for the 'not present' flag. This will only be set if the device 561 * was not present at the time of import. 562 */ 563 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 564 &vd->vdev_not_present); 565 566 /* 567 * Get the alignment requirement. 568 */ 569 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 570 571 /* 572 * Retrieve the vdev creation time. 573 */ 574 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 575 &vd->vdev_crtxg); 576 577 /* 578 * If we're a top-level vdev, try to load the allocation parameters. 579 */ 580 if (parent && !parent->vdev_parent && 581 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 582 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 583 &vd->vdev_ms_array); 584 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 585 &vd->vdev_ms_shift); 586 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 587 &vd->vdev_asize); 588 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 589 &vd->vdev_removing); 590 } 591 592 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 593 ASSERT(alloctype == VDEV_ALLOC_LOAD || 594 alloctype == VDEV_ALLOC_ADD || 595 alloctype == VDEV_ALLOC_SPLIT || 596 alloctype == VDEV_ALLOC_ROOTPOOL); 597 vd->vdev_mg = metaslab_group_create(islog ? 598 spa_log_class(spa) : spa_normal_class(spa), vd); 599 } 600 601 /* 602 * If we're a leaf vdev, try to load the DTL object and other state. 603 */ 604 if (vd->vdev_ops->vdev_op_leaf && 605 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 606 alloctype == VDEV_ALLOC_ROOTPOOL)) { 607 if (alloctype == VDEV_ALLOC_LOAD) { 608 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 609 &vd->vdev_dtl_object); 610 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 611 &vd->vdev_unspare); 612 } 613 614 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 615 uint64_t spare = 0; 616 617 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 618 &spare) == 0 && spare) 619 spa_spare_add(vd); 620 } 621 622 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 623 &vd->vdev_offline); 624 625 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 626 &vd->vdev_resilver_txg); 627 628 /* 629 * When importing a pool, we want to ignore the persistent fault 630 * state, as the diagnosis made on another system may not be 631 * valid in the current context. Local vdevs will 632 * remain in the faulted state. 633 */ 634 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 635 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 636 &vd->vdev_faulted); 637 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 638 &vd->vdev_degraded); 639 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 640 &vd->vdev_removed); 641 642 if (vd->vdev_faulted || vd->vdev_degraded) { 643 char *aux; 644 645 vd->vdev_label_aux = 646 VDEV_AUX_ERR_EXCEEDED; 647 if (nvlist_lookup_string(nv, 648 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 649 strcmp(aux, "external") == 0) 650 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 651 } 652 } 653 } 654 655 /* 656 * Add ourselves to the parent's list of children. 657 */ 658 vdev_add_child(parent, vd); 659 660 *vdp = vd; 661 662 return (0); 663} 664 665void 666vdev_free(vdev_t *vd) 667{ 668 spa_t *spa = vd->vdev_spa; 669 670 /* 671 * vdev_free() implies closing the vdev first. This is simpler than 672 * trying to ensure complicated semantics for all callers. 673 */ 674 vdev_close(vd); 675 676 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 677 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 678 679 /* 680 * Free all children. 681 */ 682 for (int c = 0; c < vd->vdev_children; c++) 683 vdev_free(vd->vdev_child[c]); 684 685 ASSERT(vd->vdev_child == NULL); 686 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 687 688 /* 689 * Discard allocation state. 690 */ 691 if (vd->vdev_mg != NULL) { 692 vdev_metaslab_fini(vd); 693 metaslab_group_destroy(vd->vdev_mg); 694 } 695 696 ASSERT0(vd->vdev_stat.vs_space); 697 ASSERT0(vd->vdev_stat.vs_dspace); 698 ASSERT0(vd->vdev_stat.vs_alloc); 699 700 /* 701 * Remove this vdev from its parent's child list. 702 */ 703 vdev_remove_child(vd->vdev_parent, vd); 704 705 ASSERT(vd->vdev_parent == NULL); 706 707 /* 708 * Clean up vdev structure. 709 */ 710 vdev_queue_fini(vd); 711 vdev_cache_fini(vd); 712 713 if (vd->vdev_path) 714 spa_strfree(vd->vdev_path); 715 if (vd->vdev_devid) 716 spa_strfree(vd->vdev_devid); 717 if (vd->vdev_physpath) 718 spa_strfree(vd->vdev_physpath); 719 if (vd->vdev_fru) 720 spa_strfree(vd->vdev_fru); 721 722 if (vd->vdev_isspare) 723 spa_spare_remove(vd); 724 if (vd->vdev_isl2cache) 725 spa_l2cache_remove(vd); 726 727 txg_list_destroy(&vd->vdev_ms_list); 728 txg_list_destroy(&vd->vdev_dtl_list); 729 730 mutex_enter(&vd->vdev_dtl_lock); 731 space_map_close(vd->vdev_dtl_sm); 732 for (int t = 0; t < DTL_TYPES; t++) { 733 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 734 range_tree_destroy(vd->vdev_dtl[t]); 735 } 736 mutex_exit(&vd->vdev_dtl_lock); 737 738 mutex_destroy(&vd->vdev_dtl_lock); 739 mutex_destroy(&vd->vdev_stat_lock); 740 mutex_destroy(&vd->vdev_probe_lock); 741 742 if (vd == spa->spa_root_vdev) 743 spa->spa_root_vdev = NULL; 744 745 kmem_free(vd, sizeof (vdev_t)); 746} 747 748/* 749 * Transfer top-level vdev state from svd to tvd. 750 */ 751static void 752vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 753{ 754 spa_t *spa = svd->vdev_spa; 755 metaslab_t *msp; 756 vdev_t *vd; 757 int t; 758 759 ASSERT(tvd == tvd->vdev_top); 760 761 tvd->vdev_ms_array = svd->vdev_ms_array; 762 tvd->vdev_ms_shift = svd->vdev_ms_shift; 763 tvd->vdev_ms_count = svd->vdev_ms_count; 764 765 svd->vdev_ms_array = 0; 766 svd->vdev_ms_shift = 0; 767 svd->vdev_ms_count = 0; 768 769 if (tvd->vdev_mg) 770 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 771 tvd->vdev_mg = svd->vdev_mg; 772 tvd->vdev_ms = svd->vdev_ms; 773 774 svd->vdev_mg = NULL; 775 svd->vdev_ms = NULL; 776 777 if (tvd->vdev_mg != NULL) 778 tvd->vdev_mg->mg_vd = tvd; 779 780 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 781 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 782 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 783 784 svd->vdev_stat.vs_alloc = 0; 785 svd->vdev_stat.vs_space = 0; 786 svd->vdev_stat.vs_dspace = 0; 787 788 for (t = 0; t < TXG_SIZE; t++) { 789 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 790 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 791 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 792 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 793 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 794 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 795 } 796 797 if (list_link_active(&svd->vdev_config_dirty_node)) { 798 vdev_config_clean(svd); 799 vdev_config_dirty(tvd); 800 } 801 802 if (list_link_active(&svd->vdev_state_dirty_node)) { 803 vdev_state_clean(svd); 804 vdev_state_dirty(tvd); 805 } 806 807 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 808 svd->vdev_deflate_ratio = 0; 809 810 tvd->vdev_islog = svd->vdev_islog; 811 svd->vdev_islog = 0; 812} 813 814static void 815vdev_top_update(vdev_t *tvd, vdev_t *vd) 816{ 817 if (vd == NULL) 818 return; 819 820 vd->vdev_top = tvd; 821 822 for (int c = 0; c < vd->vdev_children; c++) 823 vdev_top_update(tvd, vd->vdev_child[c]); 824} 825 826/* 827 * Add a mirror/replacing vdev above an existing vdev. 828 */ 829vdev_t * 830vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 831{ 832 spa_t *spa = cvd->vdev_spa; 833 vdev_t *pvd = cvd->vdev_parent; 834 vdev_t *mvd; 835 836 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 837 838 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 839 840 mvd->vdev_asize = cvd->vdev_asize; 841 mvd->vdev_min_asize = cvd->vdev_min_asize; 842 mvd->vdev_max_asize = cvd->vdev_max_asize; 843 mvd->vdev_ashift = cvd->vdev_ashift; 844 mvd->vdev_logical_ashift = cvd->vdev_logical_ashift; 845 mvd->vdev_physical_ashift = cvd->vdev_physical_ashift; 846 mvd->vdev_state = cvd->vdev_state; 847 mvd->vdev_crtxg = cvd->vdev_crtxg; 848 849 vdev_remove_child(pvd, cvd); 850 vdev_add_child(pvd, mvd); 851 cvd->vdev_id = mvd->vdev_children; 852 vdev_add_child(mvd, cvd); 853 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 854 855 if (mvd == mvd->vdev_top) 856 vdev_top_transfer(cvd, mvd); 857 858 return (mvd); 859} 860 861/* 862 * Remove a 1-way mirror/replacing vdev from the tree. 863 */ 864void 865vdev_remove_parent(vdev_t *cvd) 866{ 867 vdev_t *mvd = cvd->vdev_parent; 868 vdev_t *pvd = mvd->vdev_parent; 869 870 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 871 872 ASSERT(mvd->vdev_children == 1); 873 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 874 mvd->vdev_ops == &vdev_replacing_ops || 875 mvd->vdev_ops == &vdev_spare_ops); 876 cvd->vdev_ashift = mvd->vdev_ashift; 877 cvd->vdev_logical_ashift = mvd->vdev_logical_ashift; 878 cvd->vdev_physical_ashift = mvd->vdev_physical_ashift; 879 880 vdev_remove_child(mvd, cvd); 881 vdev_remove_child(pvd, mvd); 882 883 /* 884 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 885 * Otherwise, we could have detached an offline device, and when we 886 * go to import the pool we'll think we have two top-level vdevs, 887 * instead of a different version of the same top-level vdev. 888 */ 889 if (mvd->vdev_top == mvd) { 890 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 891 cvd->vdev_orig_guid = cvd->vdev_guid; 892 cvd->vdev_guid += guid_delta; 893 cvd->vdev_guid_sum += guid_delta; 894 } 895 cvd->vdev_id = mvd->vdev_id; 896 vdev_add_child(pvd, cvd); 897 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 898 899 if (cvd == cvd->vdev_top) 900 vdev_top_transfer(mvd, cvd); 901 902 ASSERT(mvd->vdev_children == 0); 903 vdev_free(mvd); 904} 905 906int 907vdev_metaslab_init(vdev_t *vd, uint64_t txg) 908{ 909 spa_t *spa = vd->vdev_spa; 910 objset_t *mos = spa->spa_meta_objset; 911 uint64_t m; 912 uint64_t oldc = vd->vdev_ms_count; 913 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 914 metaslab_t **mspp; 915 int error; 916 917 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 918 919 /* 920 * This vdev is not being allocated from yet or is a hole. 921 */ 922 if (vd->vdev_ms_shift == 0) 923 return (0); 924 925 ASSERT(!vd->vdev_ishole); 926 927 /* 928 * Compute the raidz-deflation ratio. Note, we hard-code 929 * in 128k (1 << 17) because it is the current "typical" blocksize. 930 * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change, 931 * or we will inconsistently account for existing bp's. 932 */ 933 vd->vdev_deflate_ratio = (1 << 17) / 934 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 935 936 ASSERT(oldc <= newc); 937 938 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 939 940 if (oldc != 0) { 941 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 942 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 943 } 944 945 vd->vdev_ms = mspp; 946 vd->vdev_ms_count = newc; 947 948 for (m = oldc; m < newc; m++) { 949 uint64_t object = 0; 950 951 if (txg == 0) { 952 error = dmu_read(mos, vd->vdev_ms_array, 953 m * sizeof (uint64_t), sizeof (uint64_t), &object, 954 DMU_READ_PREFETCH); 955 if (error) 956 return (error); 957 } 958 vd->vdev_ms[m] = metaslab_init(vd->vdev_mg, m, object, txg); 959 } 960 961 if (txg == 0) 962 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 963 964 /* 965 * If the vdev is being removed we don't activate 966 * the metaslabs since we want to ensure that no new 967 * allocations are performed on this device. 968 */ 969 if (oldc == 0 && !vd->vdev_removing) 970 metaslab_group_activate(vd->vdev_mg); 971 972 if (txg == 0) 973 spa_config_exit(spa, SCL_ALLOC, FTAG); 974 975 return (0); 976} 977 978void 979vdev_metaslab_fini(vdev_t *vd) 980{ 981 uint64_t m; 982 uint64_t count = vd->vdev_ms_count; 983 984 if (vd->vdev_ms != NULL) { 985 metaslab_group_passivate(vd->vdev_mg); 986 for (m = 0; m < count; m++) { 987 metaslab_t *msp = vd->vdev_ms[m]; 988 989 if (msp != NULL) 990 metaslab_fini(msp); 991 } 992 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 993 vd->vdev_ms = NULL; 994 } 995} 996 997typedef struct vdev_probe_stats { 998 boolean_t vps_readable; 999 boolean_t vps_writeable; 1000 int vps_flags; 1001} vdev_probe_stats_t; 1002 1003static void 1004vdev_probe_done(zio_t *zio) 1005{ 1006 spa_t *spa = zio->io_spa; 1007 vdev_t *vd = zio->io_vd; 1008 vdev_probe_stats_t *vps = zio->io_private; 1009 1010 ASSERT(vd->vdev_probe_zio != NULL); 1011 1012 if (zio->io_type == ZIO_TYPE_READ) { 1013 if (zio->io_error == 0) 1014 vps->vps_readable = 1; 1015 if (zio->io_error == 0 && spa_writeable(spa)) { 1016 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1017 zio->io_offset, zio->io_size, zio->io_data, 1018 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1019 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1020 } else { 1021 zio_buf_free(zio->io_data, zio->io_size); 1022 } 1023 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1024 if (zio->io_error == 0) 1025 vps->vps_writeable = 1; 1026 zio_buf_free(zio->io_data, zio->io_size); 1027 } else if (zio->io_type == ZIO_TYPE_NULL) { 1028 zio_t *pio; 1029 1030 vd->vdev_cant_read |= !vps->vps_readable; 1031 vd->vdev_cant_write |= !vps->vps_writeable; 1032 1033 if (vdev_readable(vd) && 1034 (vdev_writeable(vd) || !spa_writeable(spa))) { 1035 zio->io_error = 0; 1036 } else { 1037 ASSERT(zio->io_error != 0); 1038 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1039 spa, vd, NULL, 0, 0); 1040 zio->io_error = SET_ERROR(ENXIO); 1041 } 1042 1043 mutex_enter(&vd->vdev_probe_lock); 1044 ASSERT(vd->vdev_probe_zio == zio); 1045 vd->vdev_probe_zio = NULL; 1046 mutex_exit(&vd->vdev_probe_lock); 1047 1048 while ((pio = zio_walk_parents(zio)) != NULL) 1049 if (!vdev_accessible(vd, pio)) 1050 pio->io_error = SET_ERROR(ENXIO); 1051 1052 kmem_free(vps, sizeof (*vps)); 1053 } 1054} 1055 1056/* 1057 * Determine whether this device is accessible. 1058 * 1059 * Read and write to several known locations: the pad regions of each 1060 * vdev label but the first, which we leave alone in case it contains 1061 * a VTOC. 1062 */ 1063zio_t * 1064vdev_probe(vdev_t *vd, zio_t *zio) 1065{ 1066 spa_t *spa = vd->vdev_spa; 1067 vdev_probe_stats_t *vps = NULL; 1068 zio_t *pio; 1069 1070 ASSERT(vd->vdev_ops->vdev_op_leaf); 1071 1072 /* 1073 * Don't probe the probe. 1074 */ 1075 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1076 return (NULL); 1077 1078 /* 1079 * To prevent 'probe storms' when a device fails, we create 1080 * just one probe i/o at a time. All zios that want to probe 1081 * this vdev will become parents of the probe io. 1082 */ 1083 mutex_enter(&vd->vdev_probe_lock); 1084 1085 if ((pio = vd->vdev_probe_zio) == NULL) { 1086 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1087 1088 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1089 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1090 ZIO_FLAG_TRYHARD; 1091 1092 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1093 /* 1094 * vdev_cant_read and vdev_cant_write can only 1095 * transition from TRUE to FALSE when we have the 1096 * SCL_ZIO lock as writer; otherwise they can only 1097 * transition from FALSE to TRUE. This ensures that 1098 * any zio looking at these values can assume that 1099 * failures persist for the life of the I/O. That's 1100 * important because when a device has intermittent 1101 * connectivity problems, we want to ensure that 1102 * they're ascribed to the device (ENXIO) and not 1103 * the zio (EIO). 1104 * 1105 * Since we hold SCL_ZIO as writer here, clear both 1106 * values so the probe can reevaluate from first 1107 * principles. 1108 */ 1109 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1110 vd->vdev_cant_read = B_FALSE; 1111 vd->vdev_cant_write = B_FALSE; 1112 } 1113 1114 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1115 vdev_probe_done, vps, 1116 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1117 1118 /* 1119 * We can't change the vdev state in this context, so we 1120 * kick off an async task to do it on our behalf. 1121 */ 1122 if (zio != NULL) { 1123 vd->vdev_probe_wanted = B_TRUE; 1124 spa_async_request(spa, SPA_ASYNC_PROBE); 1125 } 1126 } 1127 1128 if (zio != NULL) 1129 zio_add_child(zio, pio); 1130 1131 mutex_exit(&vd->vdev_probe_lock); 1132 1133 if (vps == NULL) { 1134 ASSERT(zio != NULL); 1135 return (NULL); 1136 } 1137 1138 for (int l = 1; l < VDEV_LABELS; l++) { 1139 zio_nowait(zio_read_phys(pio, vd, 1140 vdev_label_offset(vd->vdev_psize, l, 1141 offsetof(vdev_label_t, vl_pad2)), 1142 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1143 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1144 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1145 } 1146 1147 if (zio == NULL) 1148 return (pio); 1149 1150 zio_nowait(pio); 1151 return (NULL); 1152} 1153 1154static void 1155vdev_open_child(void *arg) 1156{ 1157 vdev_t *vd = arg; 1158 1159 vd->vdev_open_thread = curthread; 1160 vd->vdev_open_error = vdev_open(vd); 1161 vd->vdev_open_thread = NULL; 1162} 1163 1164boolean_t 1165vdev_uses_zvols(vdev_t *vd) 1166{ 1167 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1168 strlen(ZVOL_DIR)) == 0) 1169 return (B_TRUE); 1170 for (int c = 0; c < vd->vdev_children; c++) 1171 if (vdev_uses_zvols(vd->vdev_child[c])) 1172 return (B_TRUE); 1173 return (B_FALSE); 1174} 1175 1176void 1177vdev_open_children(vdev_t *vd) 1178{ 1179 taskq_t *tq; 1180 int children = vd->vdev_children; 1181 1182 /* 1183 * in order to handle pools on top of zvols, do the opens 1184 * in a single thread so that the same thread holds the 1185 * spa_namespace_lock 1186 */ 1187 if (B_TRUE || vdev_uses_zvols(vd)) { 1188 for (int c = 0; c < children; c++) 1189 vd->vdev_child[c]->vdev_open_error = 1190 vdev_open(vd->vdev_child[c]); 1191 return; 1192 } 1193 tq = taskq_create("vdev_open", children, minclsyspri, 1194 children, children, TASKQ_PREPOPULATE); 1195 1196 for (int c = 0; c < children; c++) 1197 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1198 TQ_SLEEP) != 0); 1199 1200 taskq_destroy(tq); 1201} 1202 1203/* 1204 * Prepare a virtual device for access. 1205 */ 1206int 1207vdev_open(vdev_t *vd) 1208{ 1209 spa_t *spa = vd->vdev_spa; 1210 int error; 1211 uint64_t osize = 0; 1212 uint64_t max_osize = 0; 1213 uint64_t asize, max_asize, psize; 1214 uint64_t logical_ashift = 0; 1215 uint64_t physical_ashift = 0; 1216 1217 ASSERT(vd->vdev_open_thread == curthread || 1218 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1219 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1220 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1221 vd->vdev_state == VDEV_STATE_OFFLINE); 1222 1223 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1224 vd->vdev_cant_read = B_FALSE; 1225 vd->vdev_cant_write = B_FALSE; 1226 vd->vdev_min_asize = vdev_get_min_asize(vd); 1227 1228 /* 1229 * If this vdev is not removed, check its fault status. If it's 1230 * faulted, bail out of the open. 1231 */ 1232 if (!vd->vdev_removed && vd->vdev_faulted) { 1233 ASSERT(vd->vdev_children == 0); 1234 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1235 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1236 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1237 vd->vdev_label_aux); 1238 return (SET_ERROR(ENXIO)); 1239 } else if (vd->vdev_offline) { 1240 ASSERT(vd->vdev_children == 0); 1241 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1242 return (SET_ERROR(ENXIO)); 1243 } 1244 1245 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, 1246 &logical_ashift, &physical_ashift); 1247 1248 /* 1249 * Reset the vdev_reopening flag so that we actually close 1250 * the vdev on error. 1251 */ 1252 vd->vdev_reopening = B_FALSE; 1253 if (zio_injection_enabled && error == 0) 1254 error = zio_handle_device_injection(vd, NULL, ENXIO); 1255 1256 if (error) { 1257 if (vd->vdev_removed && 1258 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1259 vd->vdev_removed = B_FALSE; 1260 1261 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1262 vd->vdev_stat.vs_aux); 1263 return (error); 1264 } 1265 1266 vd->vdev_removed = B_FALSE; 1267 1268 /* 1269 * Recheck the faulted flag now that we have confirmed that 1270 * the vdev is accessible. If we're faulted, bail. 1271 */ 1272 if (vd->vdev_faulted) { 1273 ASSERT(vd->vdev_children == 0); 1274 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1275 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1276 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1277 vd->vdev_label_aux); 1278 return (SET_ERROR(ENXIO)); 1279 } 1280 1281 if (vd->vdev_degraded) { 1282 ASSERT(vd->vdev_children == 0); 1283 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1284 VDEV_AUX_ERR_EXCEEDED); 1285 } else { 1286 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1287 } 1288 1289 /* 1290 * For hole or missing vdevs we just return success. 1291 */ 1292 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1293 return (0); 1294 1295 if (vd->vdev_ops->vdev_op_leaf) { 1296 vd->vdev_notrim = B_FALSE; 1297 trim_map_create(vd); 1298 } 1299 1300 for (int c = 0; c < vd->vdev_children; c++) { 1301 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1302 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1303 VDEV_AUX_NONE); 1304 break; 1305 } 1306 } 1307 1308 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1309 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1310 1311 if (vd->vdev_children == 0) { 1312 if (osize < SPA_MINDEVSIZE) { 1313 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1314 VDEV_AUX_TOO_SMALL); 1315 return (SET_ERROR(EOVERFLOW)); 1316 } 1317 psize = osize; 1318 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1319 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1320 VDEV_LABEL_END_SIZE); 1321 } else { 1322 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1323 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1324 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1325 VDEV_AUX_TOO_SMALL); 1326 return (SET_ERROR(EOVERFLOW)); 1327 } 1328 psize = 0; 1329 asize = osize; 1330 max_asize = max_osize; 1331 } 1332 1333 vd->vdev_psize = psize; 1334 1335 /* 1336 * Make sure the allocatable size hasn't shrunk. 1337 */ 1338 if (asize < vd->vdev_min_asize) { 1339 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1340 VDEV_AUX_BAD_LABEL); 1341 return (SET_ERROR(EINVAL)); 1342 } 1343 1344 vd->vdev_physical_ashift = 1345 MAX(physical_ashift, vd->vdev_physical_ashift); 1346 vd->vdev_logical_ashift = MAX(logical_ashift, vd->vdev_logical_ashift); 1347 vd->vdev_ashift = MAX(vd->vdev_logical_ashift, vd->vdev_ashift); 1348 1349 if (vd->vdev_logical_ashift > SPA_MAXASHIFT) { 1350 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1351 VDEV_AUX_ASHIFT_TOO_BIG); 1352 return (EINVAL); 1353 } 1354 1355 if (vd->vdev_asize == 0) { 1356 /* 1357 * This is the first-ever open, so use the computed values. 1358 * For testing purposes, a higher ashift can be requested. 1359 */ 1360 vd->vdev_asize = asize; 1361 vd->vdev_max_asize = max_asize; 1362 } else { 1363 /* 1364 * Make sure the alignment requirement hasn't increased. 1365 */ 1366 if (vd->vdev_ashift > vd->vdev_top->vdev_ashift && 1367 vd->vdev_ops->vdev_op_leaf) { 1368 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1369 VDEV_AUX_BAD_LABEL); 1370 return (EINVAL); 1371 } 1372 vd->vdev_max_asize = max_asize; 1373 } 1374 1375 /* 1376 * If all children are healthy and the asize has increased, 1377 * then we've experienced dynamic LUN growth. If automatic 1378 * expansion is enabled then use the additional space. 1379 */ 1380 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1381 (vd->vdev_expanding || spa->spa_autoexpand)) 1382 vd->vdev_asize = asize; 1383 1384 vdev_set_min_asize(vd); 1385 1386 /* 1387 * Ensure we can issue some IO before declaring the 1388 * vdev open for business. 1389 */ 1390 if (vd->vdev_ops->vdev_op_leaf && 1391 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1392 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1393 VDEV_AUX_ERR_EXCEEDED); 1394 return (error); 1395 } 1396 1397 /* 1398 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1399 * resilver. But don't do this if we are doing a reopen for a scrub, 1400 * since this would just restart the scrub we are already doing. 1401 */ 1402 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1403 vdev_resilver_needed(vd, NULL, NULL)) 1404 spa_async_request(spa, SPA_ASYNC_RESILVER); 1405 1406 return (0); 1407} 1408 1409/* 1410 * Called once the vdevs are all opened, this routine validates the label 1411 * contents. This needs to be done before vdev_load() so that we don't 1412 * inadvertently do repair I/Os to the wrong device. 1413 * 1414 * If 'strict' is false ignore the spa guid check. This is necessary because 1415 * if the machine crashed during a re-guid the new guid might have been written 1416 * to all of the vdev labels, but not the cached config. The strict check 1417 * will be performed when the pool is opened again using the mos config. 1418 * 1419 * This function will only return failure if one of the vdevs indicates that it 1420 * has since been destroyed or exported. This is only possible if 1421 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1422 * will be updated but the function will return 0. 1423 */ 1424int 1425vdev_validate(vdev_t *vd, boolean_t strict) 1426{ 1427 spa_t *spa = vd->vdev_spa; 1428 nvlist_t *label; 1429 uint64_t guid = 0, top_guid; 1430 uint64_t state; 1431 1432 for (int c = 0; c < vd->vdev_children; c++) 1433 if (vdev_validate(vd->vdev_child[c], strict) != 0) 1434 return (SET_ERROR(EBADF)); 1435 1436 /* 1437 * If the device has already failed, or was marked offline, don't do 1438 * any further validation. Otherwise, label I/O will fail and we will 1439 * overwrite the previous state. 1440 */ 1441 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1442 uint64_t aux_guid = 0; 1443 nvlist_t *nvl; 1444 uint64_t txg = spa_last_synced_txg(spa) != 0 ? 1445 spa_last_synced_txg(spa) : -1ULL; 1446 1447 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1448 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1449 VDEV_AUX_BAD_LABEL); 1450 return (0); 1451 } 1452 1453 /* 1454 * Determine if this vdev has been split off into another 1455 * pool. If so, then refuse to open it. 1456 */ 1457 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1458 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1459 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1460 VDEV_AUX_SPLIT_POOL); 1461 nvlist_free(label); 1462 return (0); 1463 } 1464 1465 if (strict && (nvlist_lookup_uint64(label, 1466 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 || 1467 guid != spa_guid(spa))) { 1468 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1469 VDEV_AUX_CORRUPT_DATA); 1470 nvlist_free(label); 1471 return (0); 1472 } 1473 1474 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1475 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1476 &aux_guid) != 0) 1477 aux_guid = 0; 1478 1479 /* 1480 * If this vdev just became a top-level vdev because its 1481 * sibling was detached, it will have adopted the parent's 1482 * vdev guid -- but the label may or may not be on disk yet. 1483 * Fortunately, either version of the label will have the 1484 * same top guid, so if we're a top-level vdev, we can 1485 * safely compare to that instead. 1486 * 1487 * If we split this vdev off instead, then we also check the 1488 * original pool's guid. We don't want to consider the vdev 1489 * corrupt if it is partway through a split operation. 1490 */ 1491 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1492 &guid) != 0 || 1493 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1494 &top_guid) != 0 || 1495 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1496 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1497 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1498 VDEV_AUX_CORRUPT_DATA); 1499 nvlist_free(label); 1500 return (0); 1501 } 1502 1503 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1504 &state) != 0) { 1505 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1506 VDEV_AUX_CORRUPT_DATA); 1507 nvlist_free(label); 1508 return (0); 1509 } 1510 1511 nvlist_free(label); 1512 1513 /* 1514 * If this is a verbatim import, no need to check the 1515 * state of the pool. 1516 */ 1517 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1518 spa_load_state(spa) == SPA_LOAD_OPEN && 1519 state != POOL_STATE_ACTIVE) 1520 return (SET_ERROR(EBADF)); 1521 1522 /* 1523 * If we were able to open and validate a vdev that was 1524 * previously marked permanently unavailable, clear that state 1525 * now. 1526 */ 1527 if (vd->vdev_not_present) 1528 vd->vdev_not_present = 0; 1529 } 1530 1531 return (0); 1532} 1533 1534/* 1535 * Close a virtual device. 1536 */ 1537void 1538vdev_close(vdev_t *vd) 1539{ 1540 spa_t *spa = vd->vdev_spa; 1541 vdev_t *pvd = vd->vdev_parent; 1542 1543 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1544 1545 /* 1546 * If our parent is reopening, then we are as well, unless we are 1547 * going offline. 1548 */ 1549 if (pvd != NULL && pvd->vdev_reopening) 1550 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1551 1552 vd->vdev_ops->vdev_op_close(vd); 1553 1554 vdev_cache_purge(vd); 1555 1556 if (vd->vdev_ops->vdev_op_leaf) 1557 trim_map_destroy(vd); 1558 1559 /* 1560 * We record the previous state before we close it, so that if we are 1561 * doing a reopen(), we don't generate FMA ereports if we notice that 1562 * it's still faulted. 1563 */ 1564 vd->vdev_prevstate = vd->vdev_state; 1565 1566 if (vd->vdev_offline) 1567 vd->vdev_state = VDEV_STATE_OFFLINE; 1568 else 1569 vd->vdev_state = VDEV_STATE_CLOSED; 1570 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1571} 1572 1573void 1574vdev_hold(vdev_t *vd) 1575{ 1576 spa_t *spa = vd->vdev_spa; 1577 1578 ASSERT(spa_is_root(spa)); 1579 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1580 return; 1581 1582 for (int c = 0; c < vd->vdev_children; c++) 1583 vdev_hold(vd->vdev_child[c]); 1584 1585 if (vd->vdev_ops->vdev_op_leaf) 1586 vd->vdev_ops->vdev_op_hold(vd); 1587} 1588 1589void 1590vdev_rele(vdev_t *vd) 1591{ 1592 spa_t *spa = vd->vdev_spa; 1593 1594 ASSERT(spa_is_root(spa)); 1595 for (int c = 0; c < vd->vdev_children; c++) 1596 vdev_rele(vd->vdev_child[c]); 1597 1598 if (vd->vdev_ops->vdev_op_leaf) 1599 vd->vdev_ops->vdev_op_rele(vd); 1600} 1601 1602/* 1603 * Reopen all interior vdevs and any unopened leaves. We don't actually 1604 * reopen leaf vdevs which had previously been opened as they might deadlock 1605 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1606 * If the leaf has never been opened then open it, as usual. 1607 */ 1608void 1609vdev_reopen(vdev_t *vd) 1610{ 1611 spa_t *spa = vd->vdev_spa; 1612 1613 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1614 1615 /* set the reopening flag unless we're taking the vdev offline */ 1616 vd->vdev_reopening = !vd->vdev_offline; 1617 vdev_close(vd); 1618 (void) vdev_open(vd); 1619 1620 /* 1621 * Call vdev_validate() here to make sure we have the same device. 1622 * Otherwise, a device with an invalid label could be successfully 1623 * opened in response to vdev_reopen(). 1624 */ 1625 if (vd->vdev_aux) { 1626 (void) vdev_validate_aux(vd); 1627 if (vdev_readable(vd) && vdev_writeable(vd) && 1628 vd->vdev_aux == &spa->spa_l2cache && 1629 !l2arc_vdev_present(vd)) 1630 l2arc_add_vdev(spa, vd); 1631 } else { 1632 (void) vdev_validate(vd, B_TRUE); 1633 } 1634 1635 /* 1636 * Reassess parent vdev's health. 1637 */ 1638 vdev_propagate_state(vd); 1639} 1640 1641int 1642vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1643{ 1644 int error; 1645 1646 /* 1647 * Normally, partial opens (e.g. of a mirror) are allowed. 1648 * For a create, however, we want to fail the request if 1649 * there are any components we can't open. 1650 */ 1651 error = vdev_open(vd); 1652 1653 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1654 vdev_close(vd); 1655 return (error ? error : ENXIO); 1656 } 1657 1658 /* 1659 * Recursively load DTLs and initialize all labels. 1660 */ 1661 if ((error = vdev_dtl_load(vd)) != 0 || 1662 (error = vdev_label_init(vd, txg, isreplacing ? 1663 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1664 vdev_close(vd); 1665 return (error); 1666 } 1667 1668 return (0); 1669} 1670 1671void 1672vdev_metaslab_set_size(vdev_t *vd) 1673{ 1674 /* 1675 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev. 1676 */ 1677 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev); 1678 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1679} 1680 1681/* 1682 * Maximize performance by inflating the configured ashift for top level 1683 * vdevs to be as close to the physical ashift as possible while maintaining 1684 * administrator defined limits and ensuring it doesn't go below the 1685 * logical ashift. 1686 */ 1687void 1688vdev_ashift_optimize(vdev_t *vd) 1689{ 1690 if (vd == vd->vdev_top) { 1691 if (vd->vdev_ashift < vd->vdev_physical_ashift) { 1692 vd->vdev_ashift = MIN( 1693 MAX(zfs_max_auto_ashift, vd->vdev_ashift), 1694 MAX(zfs_min_auto_ashift, vd->vdev_physical_ashift)); 1695 } else { 1696 /* 1697 * Unusual case where logical ashift > physical ashift 1698 * so we can't cap the calculated ashift based on max 1699 * ashift as that would cause failures. 1700 * We still check if we need to increase it to match 1701 * the min ashift. 1702 */ 1703 vd->vdev_ashift = MAX(zfs_min_auto_ashift, 1704 vd->vdev_ashift); 1705 } 1706 } 1707} 1708 1709void 1710vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1711{ 1712 ASSERT(vd == vd->vdev_top); 1713 ASSERT(!vd->vdev_ishole); 1714 ASSERT(ISP2(flags)); 1715 ASSERT(spa_writeable(vd->vdev_spa)); 1716 1717 if (flags & VDD_METASLAB) 1718 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1719 1720 if (flags & VDD_DTL) 1721 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1722 1723 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1724} 1725 1726void 1727vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 1728{ 1729 for (int c = 0; c < vd->vdev_children; c++) 1730 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 1731 1732 if (vd->vdev_ops->vdev_op_leaf) 1733 vdev_dirty(vd->vdev_top, flags, vd, txg); 1734} 1735 1736/* 1737 * DTLs. 1738 * 1739 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1740 * the vdev has less than perfect replication. There are four kinds of DTL: 1741 * 1742 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1743 * 1744 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1745 * 1746 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1747 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1748 * txgs that was scrubbed. 1749 * 1750 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1751 * persistent errors or just some device being offline. 1752 * Unlike the other three, the DTL_OUTAGE map is not generally 1753 * maintained; it's only computed when needed, typically to 1754 * determine whether a device can be detached. 1755 * 1756 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1757 * either has the data or it doesn't. 1758 * 1759 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1760 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1761 * if any child is less than fully replicated, then so is its parent. 1762 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1763 * comprising only those txgs which appear in 'maxfaults' or more children; 1764 * those are the txgs we don't have enough replication to read. For example, 1765 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1766 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1767 * two child DTL_MISSING maps. 1768 * 1769 * It should be clear from the above that to compute the DTLs and outage maps 1770 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1771 * Therefore, that is all we keep on disk. When loading the pool, or after 1772 * a configuration change, we generate all other DTLs from first principles. 1773 */ 1774void 1775vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1776{ 1777 range_tree_t *rt = vd->vdev_dtl[t]; 1778 1779 ASSERT(t < DTL_TYPES); 1780 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1781 ASSERT(spa_writeable(vd->vdev_spa)); 1782 1783 mutex_enter(rt->rt_lock); 1784 if (!range_tree_contains(rt, txg, size)) 1785 range_tree_add(rt, txg, size); 1786 mutex_exit(rt->rt_lock); 1787} 1788 1789boolean_t 1790vdev_dtl_contains(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 boolean_t dirty = B_FALSE; 1794 1795 ASSERT(t < DTL_TYPES); 1796 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1797 1798 mutex_enter(rt->rt_lock); 1799 if (range_tree_space(rt) != 0) 1800 dirty = range_tree_contains(rt, txg, size); 1801 mutex_exit(rt->rt_lock); 1802 1803 return (dirty); 1804} 1805 1806boolean_t 1807vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1808{ 1809 range_tree_t *rt = vd->vdev_dtl[t]; 1810 boolean_t empty; 1811 1812 mutex_enter(rt->rt_lock); 1813 empty = (range_tree_space(rt) == 0); 1814 mutex_exit(rt->rt_lock); 1815 1816 return (empty); 1817} 1818 1819/* 1820 * Returns the lowest txg in the DTL range. 1821 */ 1822static uint64_t 1823vdev_dtl_min(vdev_t *vd) 1824{ 1825 range_seg_t *rs; 1826 1827 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1828 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1829 ASSERT0(vd->vdev_children); 1830 1831 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1832 return (rs->rs_start - 1); 1833} 1834 1835/* 1836 * Returns the highest txg in the DTL. 1837 */ 1838static uint64_t 1839vdev_dtl_max(vdev_t *vd) 1840{ 1841 range_seg_t *rs; 1842 1843 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1844 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1845 ASSERT0(vd->vdev_children); 1846 1847 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1848 return (rs->rs_end); 1849} 1850 1851/* 1852 * Determine if a resilvering vdev should remove any DTL entries from 1853 * its range. If the vdev was resilvering for the entire duration of the 1854 * scan then it should excise that range from its DTLs. Otherwise, this 1855 * vdev is considered partially resilvered and should leave its DTL 1856 * entries intact. The comment in vdev_dtl_reassess() describes how we 1857 * excise the DTLs. 1858 */ 1859static boolean_t 1860vdev_dtl_should_excise(vdev_t *vd) 1861{ 1862 spa_t *spa = vd->vdev_spa; 1863 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1864 1865 ASSERT0(scn->scn_phys.scn_errors); 1866 ASSERT0(vd->vdev_children); 1867 1868 if (vd->vdev_resilver_txg == 0 || 1869 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0) 1870 return (B_TRUE); 1871 1872 /* 1873 * When a resilver is initiated the scan will assign the scn_max_txg 1874 * value to the highest txg value that exists in all DTLs. If this 1875 * device's max DTL is not part of this scan (i.e. it is not in 1876 * the range (scn_min_txg, scn_max_txg] then it is not eligible 1877 * for excision. 1878 */ 1879 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 1880 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 1881 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 1882 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 1883 return (B_TRUE); 1884 } 1885 return (B_FALSE); 1886} 1887 1888/* 1889 * Reassess DTLs after a config change or scrub completion. 1890 */ 1891void 1892vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1893{ 1894 spa_t *spa = vd->vdev_spa; 1895 avl_tree_t reftree; 1896 int minref; 1897 1898 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1899 1900 for (int c = 0; c < vd->vdev_children; c++) 1901 vdev_dtl_reassess(vd->vdev_child[c], txg, 1902 scrub_txg, scrub_done); 1903 1904 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1905 return; 1906 1907 if (vd->vdev_ops->vdev_op_leaf) { 1908 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1909 1910 mutex_enter(&vd->vdev_dtl_lock); 1911 1912 /* 1913 * If we've completed a scan cleanly then determine 1914 * if this vdev should remove any DTLs. We only want to 1915 * excise regions on vdevs that were available during 1916 * the entire duration of this scan. 1917 */ 1918 if (scrub_txg != 0 && 1919 (spa->spa_scrub_started || 1920 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 1921 vdev_dtl_should_excise(vd)) { 1922 /* 1923 * We completed a scrub up to scrub_txg. If we 1924 * did it without rebooting, then the scrub dtl 1925 * will be valid, so excise the old region and 1926 * fold in the scrub dtl. Otherwise, leave the 1927 * dtl as-is if there was an error. 1928 * 1929 * There's little trick here: to excise the beginning 1930 * of the DTL_MISSING map, we put it into a reference 1931 * tree and then add a segment with refcnt -1 that 1932 * covers the range [0, scrub_txg). This means 1933 * that each txg in that range has refcnt -1 or 0. 1934 * We then add DTL_SCRUB with a refcnt of 2, so that 1935 * entries in the range [0, scrub_txg) will have a 1936 * positive refcnt -- either 1 or 2. We then convert 1937 * the reference tree into the new DTL_MISSING map. 1938 */ 1939 space_reftree_create(&reftree); 1940 space_reftree_add_map(&reftree, 1941 vd->vdev_dtl[DTL_MISSING], 1); 1942 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 1943 space_reftree_add_map(&reftree, 1944 vd->vdev_dtl[DTL_SCRUB], 2); 1945 space_reftree_generate_map(&reftree, 1946 vd->vdev_dtl[DTL_MISSING], 1); 1947 space_reftree_destroy(&reftree); 1948 } 1949 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1950 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1951 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 1952 if (scrub_done) 1953 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1954 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1955 if (!vdev_readable(vd)) 1956 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1957 else 1958 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1959 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 1960 1961 /* 1962 * If the vdev was resilvering and no longer has any 1963 * DTLs then reset its resilvering flag and dirty 1964 * the top level so that we persist the change. 1965 */ 1966 if (vd->vdev_resilver_txg != 0 && 1967 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 && 1968 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0) { 1969 vd->vdev_resilver_txg = 0; 1970 vdev_config_dirty(vd->vdev_top); 1971 } 1972 1973 mutex_exit(&vd->vdev_dtl_lock); 1974 1975 if (txg != 0) 1976 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 1977 return; 1978 } 1979 1980 mutex_enter(&vd->vdev_dtl_lock); 1981 for (int t = 0; t < DTL_TYPES; t++) { 1982 /* account for child's outage in parent's missing map */ 1983 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 1984 if (t == DTL_SCRUB) 1985 continue; /* leaf vdevs only */ 1986 if (t == DTL_PARTIAL) 1987 minref = 1; /* i.e. non-zero */ 1988 else if (vd->vdev_nparity != 0) 1989 minref = vd->vdev_nparity + 1; /* RAID-Z */ 1990 else 1991 minref = vd->vdev_children; /* any kind of mirror */ 1992 space_reftree_create(&reftree); 1993 for (int c = 0; c < vd->vdev_children; c++) { 1994 vdev_t *cvd = vd->vdev_child[c]; 1995 mutex_enter(&cvd->vdev_dtl_lock); 1996 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 1997 mutex_exit(&cvd->vdev_dtl_lock); 1998 } 1999 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2000 space_reftree_destroy(&reftree); 2001 } 2002 mutex_exit(&vd->vdev_dtl_lock); 2003} 2004 2005int 2006vdev_dtl_load(vdev_t *vd) 2007{ 2008 spa_t *spa = vd->vdev_spa; 2009 objset_t *mos = spa->spa_meta_objset; 2010 int error = 0; 2011 2012 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2013 ASSERT(!vd->vdev_ishole); 2014 2015 error = space_map_open(&vd->vdev_dtl_sm, mos, 2016 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock); 2017 if (error) 2018 return (error); 2019 ASSERT(vd->vdev_dtl_sm != NULL); 2020 2021 mutex_enter(&vd->vdev_dtl_lock); 2022 2023 /* 2024 * Now that we've opened the space_map we need to update 2025 * the in-core DTL. 2026 */ 2027 space_map_update(vd->vdev_dtl_sm); 2028 2029 error = space_map_load(vd->vdev_dtl_sm, 2030 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2031 mutex_exit(&vd->vdev_dtl_lock); 2032 2033 return (error); 2034 } 2035 2036 for (int c = 0; c < vd->vdev_children; c++) { 2037 error = vdev_dtl_load(vd->vdev_child[c]); 2038 if (error != 0) 2039 break; 2040 } 2041 2042 return (error); 2043} 2044 2045void 2046vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2047{ 2048 spa_t *spa = vd->vdev_spa; 2049 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2050 objset_t *mos = spa->spa_meta_objset; 2051 range_tree_t *rtsync; 2052 kmutex_t rtlock; 2053 dmu_tx_t *tx; 2054 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2055 2056 ASSERT(!vd->vdev_ishole); 2057 ASSERT(vd->vdev_ops->vdev_op_leaf); 2058 2059 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2060 2061 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2062 mutex_enter(&vd->vdev_dtl_lock); 2063 space_map_free(vd->vdev_dtl_sm, tx); 2064 space_map_close(vd->vdev_dtl_sm); 2065 vd->vdev_dtl_sm = NULL; 2066 mutex_exit(&vd->vdev_dtl_lock); 2067 dmu_tx_commit(tx); 2068 return; 2069 } 2070 2071 if (vd->vdev_dtl_sm == NULL) { 2072 uint64_t new_object; 2073 2074 new_object = space_map_alloc(mos, tx); 2075 VERIFY3U(new_object, !=, 0); 2076 2077 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2078 0, -1ULL, 0, &vd->vdev_dtl_lock)); 2079 ASSERT(vd->vdev_dtl_sm != NULL); 2080 } 2081 2082 bzero(&rtlock, sizeof(rtlock)); 2083 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL); 2084 2085 rtsync = range_tree_create(NULL, NULL, &rtlock); 2086 2087 mutex_enter(&rtlock); 2088 2089 mutex_enter(&vd->vdev_dtl_lock); 2090 range_tree_walk(rt, range_tree_add, rtsync); 2091 mutex_exit(&vd->vdev_dtl_lock); 2092 2093 space_map_truncate(vd->vdev_dtl_sm, tx); 2094 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx); 2095 range_tree_vacate(rtsync, NULL, NULL); 2096 2097 range_tree_destroy(rtsync); 2098 2099 mutex_exit(&rtlock); 2100 mutex_destroy(&rtlock); 2101 2102 /* 2103 * If the object for the space map has changed then dirty 2104 * the top level so that we update the config. 2105 */ 2106 if (object != space_map_object(vd->vdev_dtl_sm)) { 2107 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, " 2108 "new object %llu", txg, spa_name(spa), object, 2109 space_map_object(vd->vdev_dtl_sm)); 2110 vdev_config_dirty(vd->vdev_top); 2111 } 2112 2113 dmu_tx_commit(tx); 2114 2115 mutex_enter(&vd->vdev_dtl_lock); 2116 space_map_update(vd->vdev_dtl_sm); 2117 mutex_exit(&vd->vdev_dtl_lock); 2118} 2119 2120/* 2121 * Determine whether the specified vdev can be offlined/detached/removed 2122 * without losing data. 2123 */ 2124boolean_t 2125vdev_dtl_required(vdev_t *vd) 2126{ 2127 spa_t *spa = vd->vdev_spa; 2128 vdev_t *tvd = vd->vdev_top; 2129 uint8_t cant_read = vd->vdev_cant_read; 2130 boolean_t required; 2131 2132 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2133 2134 if (vd == spa->spa_root_vdev || vd == tvd) 2135 return (B_TRUE); 2136 2137 /* 2138 * Temporarily mark the device as unreadable, and then determine 2139 * whether this results in any DTL outages in the top-level vdev. 2140 * If not, we can safely offline/detach/remove the device. 2141 */ 2142 vd->vdev_cant_read = B_TRUE; 2143 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2144 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2145 vd->vdev_cant_read = cant_read; 2146 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2147 2148 if (!required && zio_injection_enabled) 2149 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2150 2151 return (required); 2152} 2153 2154/* 2155 * Determine if resilver is needed, and if so the txg range. 2156 */ 2157boolean_t 2158vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2159{ 2160 boolean_t needed = B_FALSE; 2161 uint64_t thismin = UINT64_MAX; 2162 uint64_t thismax = 0; 2163 2164 if (vd->vdev_children == 0) { 2165 mutex_enter(&vd->vdev_dtl_lock); 2166 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 && 2167 vdev_writeable(vd)) { 2168 2169 thismin = vdev_dtl_min(vd); 2170 thismax = vdev_dtl_max(vd); 2171 needed = B_TRUE; 2172 } 2173 mutex_exit(&vd->vdev_dtl_lock); 2174 } else { 2175 for (int c = 0; c < vd->vdev_children; c++) { 2176 vdev_t *cvd = vd->vdev_child[c]; 2177 uint64_t cmin, cmax; 2178 2179 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2180 thismin = MIN(thismin, cmin); 2181 thismax = MAX(thismax, cmax); 2182 needed = B_TRUE; 2183 } 2184 } 2185 } 2186 2187 if (needed && minp) { 2188 *minp = thismin; 2189 *maxp = thismax; 2190 } 2191 return (needed); 2192} 2193 2194void 2195vdev_load(vdev_t *vd) 2196{ 2197 /* 2198 * Recursively load all children. 2199 */ 2200 for (int c = 0; c < vd->vdev_children; c++) 2201 vdev_load(vd->vdev_child[c]); 2202 2203 /* 2204 * If this is a top-level vdev, initialize its metaslabs. 2205 */ 2206 if (vd == vd->vdev_top && !vd->vdev_ishole && 2207 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 2208 vdev_metaslab_init(vd, 0) != 0)) 2209 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2210 VDEV_AUX_CORRUPT_DATA); 2211 2212 /* 2213 * If this is a leaf vdev, load its DTL. 2214 */ 2215 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 2216 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2217 VDEV_AUX_CORRUPT_DATA); 2218} 2219 2220/* 2221 * The special vdev case is used for hot spares and l2cache devices. Its 2222 * sole purpose it to set the vdev state for the associated vdev. To do this, 2223 * we make sure that we can open the underlying device, then try to read the 2224 * label, and make sure that the label is sane and that it hasn't been 2225 * repurposed to another pool. 2226 */ 2227int 2228vdev_validate_aux(vdev_t *vd) 2229{ 2230 nvlist_t *label; 2231 uint64_t guid, version; 2232 uint64_t state; 2233 2234 if (!vdev_readable(vd)) 2235 return (0); 2236 2237 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2238 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2239 VDEV_AUX_CORRUPT_DATA); 2240 return (-1); 2241 } 2242 2243 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2244 !SPA_VERSION_IS_SUPPORTED(version) || 2245 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2246 guid != vd->vdev_guid || 2247 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2248 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2249 VDEV_AUX_CORRUPT_DATA); 2250 nvlist_free(label); 2251 return (-1); 2252 } 2253 2254 /* 2255 * We don't actually check the pool state here. If it's in fact in 2256 * use by another pool, we update this fact on the fly when requested. 2257 */ 2258 nvlist_free(label); 2259 return (0); 2260} 2261 2262void 2263vdev_remove(vdev_t *vd, uint64_t txg) 2264{ 2265 spa_t *spa = vd->vdev_spa; 2266 objset_t *mos = spa->spa_meta_objset; 2267 dmu_tx_t *tx; 2268 2269 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2270 2271 if (vd->vdev_ms != NULL) { 2272 metaslab_group_t *mg = vd->vdev_mg; 2273 2274 metaslab_group_histogram_verify(mg); 2275 metaslab_class_histogram_verify(mg->mg_class); 2276 2277 for (int m = 0; m < vd->vdev_ms_count; m++) { 2278 metaslab_t *msp = vd->vdev_ms[m]; 2279 2280 if (msp == NULL || msp->ms_sm == NULL) 2281 continue; 2282 2283 mutex_enter(&msp->ms_lock); 2284 /* 2285 * If the metaslab was not loaded when the vdev 2286 * was removed then the histogram accounting may 2287 * not be accurate. Update the histogram information 2288 * here so that we ensure that the metaslab group 2289 * and metaslab class are up-to-date. 2290 */ 2291 metaslab_group_histogram_remove(mg, msp); 2292 2293 VERIFY0(space_map_allocated(msp->ms_sm)); 2294 space_map_free(msp->ms_sm, tx); 2295 space_map_close(msp->ms_sm); 2296 msp->ms_sm = NULL; 2297 mutex_exit(&msp->ms_lock); 2298 } 2299 2300 metaslab_group_histogram_verify(mg); 2301 metaslab_class_histogram_verify(mg->mg_class); 2302 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 2303 ASSERT0(mg->mg_histogram[i]); 2304 2305 } 2306 2307 if (vd->vdev_ms_array) { 2308 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2309 vd->vdev_ms_array = 0; 2310 } 2311 dmu_tx_commit(tx); 2312} 2313 2314void 2315vdev_sync_done(vdev_t *vd, uint64_t txg) 2316{ 2317 metaslab_t *msp; 2318 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2319 2320 ASSERT(!vd->vdev_ishole); 2321 2322 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2323 metaslab_sync_done(msp, txg); 2324 2325 if (reassess) 2326 metaslab_sync_reassess(vd->vdev_mg); 2327} 2328 2329void 2330vdev_sync(vdev_t *vd, uint64_t txg) 2331{ 2332 spa_t *spa = vd->vdev_spa; 2333 vdev_t *lvd; 2334 metaslab_t *msp; 2335 dmu_tx_t *tx; 2336 2337 ASSERT(!vd->vdev_ishole); 2338 2339 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2340 ASSERT(vd == vd->vdev_top); 2341 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2342 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2343 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2344 ASSERT(vd->vdev_ms_array != 0); 2345 vdev_config_dirty(vd); 2346 dmu_tx_commit(tx); 2347 } 2348 2349 /* 2350 * Remove the metadata associated with this vdev once it's empty. 2351 */ 2352 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2353 vdev_remove(vd, txg); 2354 2355 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2356 metaslab_sync(msp, txg); 2357 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2358 } 2359 2360 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2361 vdev_dtl_sync(lvd, txg); 2362 2363 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2364} 2365 2366uint64_t 2367vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2368{ 2369 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2370} 2371 2372/* 2373 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2374 * not be opened, and no I/O is attempted. 2375 */ 2376int 2377vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2378{ 2379 vdev_t *vd, *tvd; 2380 2381 spa_vdev_state_enter(spa, SCL_NONE); 2382 2383 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2384 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2385 2386 if (!vd->vdev_ops->vdev_op_leaf) 2387 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2388 2389 tvd = vd->vdev_top; 2390 2391 /* 2392 * We don't directly use the aux state here, but if we do a 2393 * vdev_reopen(), we need this value to be present to remember why we 2394 * were faulted. 2395 */ 2396 vd->vdev_label_aux = aux; 2397 2398 /* 2399 * Faulted state takes precedence over degraded. 2400 */ 2401 vd->vdev_delayed_close = B_FALSE; 2402 vd->vdev_faulted = 1ULL; 2403 vd->vdev_degraded = 0ULL; 2404 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2405 2406 /* 2407 * If this device has the only valid copy of the data, then 2408 * back off and simply mark the vdev as degraded instead. 2409 */ 2410 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2411 vd->vdev_degraded = 1ULL; 2412 vd->vdev_faulted = 0ULL; 2413 2414 /* 2415 * If we reopen the device and it's not dead, only then do we 2416 * mark it degraded. 2417 */ 2418 vdev_reopen(tvd); 2419 2420 if (vdev_readable(vd)) 2421 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2422 } 2423 2424 return (spa_vdev_state_exit(spa, vd, 0)); 2425} 2426 2427/* 2428 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2429 * user that something is wrong. The vdev continues to operate as normal as far 2430 * as I/O is concerned. 2431 */ 2432int 2433vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2434{ 2435 vdev_t *vd; 2436 2437 spa_vdev_state_enter(spa, SCL_NONE); 2438 2439 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2440 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2441 2442 if (!vd->vdev_ops->vdev_op_leaf) 2443 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2444 2445 /* 2446 * If the vdev is already faulted, then don't do anything. 2447 */ 2448 if (vd->vdev_faulted || vd->vdev_degraded) 2449 return (spa_vdev_state_exit(spa, NULL, 0)); 2450 2451 vd->vdev_degraded = 1ULL; 2452 if (!vdev_is_dead(vd)) 2453 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2454 aux); 2455 2456 return (spa_vdev_state_exit(spa, vd, 0)); 2457} 2458 2459/* 2460 * Online the given vdev. 2461 * 2462 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 2463 * spare device should be detached when the device finishes resilvering. 2464 * Second, the online should be treated like a 'test' online case, so no FMA 2465 * events are generated if the device fails to open. 2466 */ 2467int 2468vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2469{ 2470 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2471 2472 spa_vdev_state_enter(spa, SCL_NONE); 2473 2474 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2475 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2476 2477 if (!vd->vdev_ops->vdev_op_leaf) 2478 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2479 2480 tvd = vd->vdev_top; 2481 vd->vdev_offline = B_FALSE; 2482 vd->vdev_tmpoffline = B_FALSE; 2483 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2484 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2485 2486 /* XXX - L2ARC 1.0 does not support expansion */ 2487 if (!vd->vdev_aux) { 2488 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2489 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2490 } 2491 2492 vdev_reopen(tvd); 2493 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2494 2495 if (!vd->vdev_aux) { 2496 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2497 pvd->vdev_expanding = B_FALSE; 2498 } 2499 2500 if (newstate) 2501 *newstate = vd->vdev_state; 2502 if ((flags & ZFS_ONLINE_UNSPARE) && 2503 !vdev_is_dead(vd) && vd->vdev_parent && 2504 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2505 vd->vdev_parent->vdev_child[0] == vd) 2506 vd->vdev_unspare = B_TRUE; 2507 2508 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2509 2510 /* XXX - L2ARC 1.0 does not support expansion */ 2511 if (vd->vdev_aux) 2512 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2513 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2514 } 2515 return (spa_vdev_state_exit(spa, vd, 0)); 2516} 2517 2518static int 2519vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2520{ 2521 vdev_t *vd, *tvd; 2522 int error = 0; 2523 uint64_t generation; 2524 metaslab_group_t *mg; 2525 2526top: 2527 spa_vdev_state_enter(spa, SCL_ALLOC); 2528 2529 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2530 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2531 2532 if (!vd->vdev_ops->vdev_op_leaf) 2533 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2534 2535 tvd = vd->vdev_top; 2536 mg = tvd->vdev_mg; 2537 generation = spa->spa_config_generation + 1; 2538 2539 /* 2540 * If the device isn't already offline, try to offline it. 2541 */ 2542 if (!vd->vdev_offline) { 2543 /* 2544 * If this device has the only valid copy of some data, 2545 * don't allow it to be offlined. Log devices are always 2546 * expendable. 2547 */ 2548 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2549 vdev_dtl_required(vd)) 2550 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2551 2552 /* 2553 * If the top-level is a slog and it has had allocations 2554 * then proceed. We check that the vdev's metaslab group 2555 * is not NULL since it's possible that we may have just 2556 * added this vdev but not yet initialized its metaslabs. 2557 */ 2558 if (tvd->vdev_islog && mg != NULL) { 2559 /* 2560 * Prevent any future allocations. 2561 */ 2562 metaslab_group_passivate(mg); 2563 (void) spa_vdev_state_exit(spa, vd, 0); 2564 2565 error = spa_offline_log(spa); 2566 2567 spa_vdev_state_enter(spa, SCL_ALLOC); 2568 2569 /* 2570 * Check to see if the config has changed. 2571 */ 2572 if (error || generation != spa->spa_config_generation) { 2573 metaslab_group_activate(mg); 2574 if (error) 2575 return (spa_vdev_state_exit(spa, 2576 vd, error)); 2577 (void) spa_vdev_state_exit(spa, vd, 0); 2578 goto top; 2579 } 2580 ASSERT0(tvd->vdev_stat.vs_alloc); 2581 } 2582 2583 /* 2584 * Offline this device and reopen its top-level vdev. 2585 * If the top-level vdev is a log device then just offline 2586 * it. Otherwise, if this action results in the top-level 2587 * vdev becoming unusable, undo it and fail the request. 2588 */ 2589 vd->vdev_offline = B_TRUE; 2590 vdev_reopen(tvd); 2591 2592 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2593 vdev_is_dead(tvd)) { 2594 vd->vdev_offline = B_FALSE; 2595 vdev_reopen(tvd); 2596 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2597 } 2598 2599 /* 2600 * Add the device back into the metaslab rotor so that 2601 * once we online the device it's open for business. 2602 */ 2603 if (tvd->vdev_islog && mg != NULL) 2604 metaslab_group_activate(mg); 2605 } 2606 2607 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2608 2609 return (spa_vdev_state_exit(spa, vd, 0)); 2610} 2611 2612int 2613vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2614{ 2615 int error; 2616 2617 mutex_enter(&spa->spa_vdev_top_lock); 2618 error = vdev_offline_locked(spa, guid, flags); 2619 mutex_exit(&spa->spa_vdev_top_lock); 2620 2621 return (error); 2622} 2623 2624/* 2625 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2626 * vdev_offline(), we assume the spa config is locked. We also clear all 2627 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2628 */ 2629void 2630vdev_clear(spa_t *spa, vdev_t *vd) 2631{ 2632 vdev_t *rvd = spa->spa_root_vdev; 2633 2634 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2635 2636 if (vd == NULL) 2637 vd = rvd; 2638 2639 vd->vdev_stat.vs_read_errors = 0; 2640 vd->vdev_stat.vs_write_errors = 0; 2641 vd->vdev_stat.vs_checksum_errors = 0; 2642 2643 for (int c = 0; c < vd->vdev_children; c++) 2644 vdev_clear(spa, vd->vdev_child[c]); 2645 2646 if (vd == rvd) { 2647 for (int c = 0; c < spa->spa_l2cache.sav_count; c++) 2648 vdev_clear(spa, spa->spa_l2cache.sav_vdevs[c]); 2649 2650 for (int c = 0; c < spa->spa_spares.sav_count; c++) 2651 vdev_clear(spa, spa->spa_spares.sav_vdevs[c]); 2652 } 2653 2654 /* 2655 * If we're in the FAULTED state or have experienced failed I/O, then 2656 * clear the persistent state and attempt to reopen the device. We 2657 * also mark the vdev config dirty, so that the new faulted state is 2658 * written out to disk. 2659 */ 2660 if (vd->vdev_faulted || vd->vdev_degraded || 2661 !vdev_readable(vd) || !vdev_writeable(vd)) { 2662 2663 /* 2664 * When reopening in reponse to a clear event, it may be due to 2665 * a fmadm repair request. In this case, if the device is 2666 * still broken, we want to still post the ereport again. 2667 */ 2668 vd->vdev_forcefault = B_TRUE; 2669 2670 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2671 vd->vdev_cant_read = B_FALSE; 2672 vd->vdev_cant_write = B_FALSE; 2673 2674 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2675 2676 vd->vdev_forcefault = B_FALSE; 2677 2678 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2679 vdev_state_dirty(vd->vdev_top); 2680 2681 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2682 spa_async_request(spa, SPA_ASYNC_RESILVER); 2683 2684 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2685 } 2686 2687 /* 2688 * When clearing a FMA-diagnosed fault, we always want to 2689 * unspare the device, as we assume that the original spare was 2690 * done in response to the FMA fault. 2691 */ 2692 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2693 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2694 vd->vdev_parent->vdev_child[0] == vd) 2695 vd->vdev_unspare = B_TRUE; 2696} 2697 2698boolean_t 2699vdev_is_dead(vdev_t *vd) 2700{ 2701 /* 2702 * Holes and missing devices are always considered "dead". 2703 * This simplifies the code since we don't have to check for 2704 * these types of devices in the various code paths. 2705 * Instead we rely on the fact that we skip over dead devices 2706 * before issuing I/O to them. 2707 */ 2708 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2709 vd->vdev_ops == &vdev_missing_ops); 2710} 2711 2712boolean_t 2713vdev_readable(vdev_t *vd) 2714{ 2715 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2716} 2717 2718boolean_t 2719vdev_writeable(vdev_t *vd) 2720{ 2721 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2722} 2723 2724boolean_t 2725vdev_allocatable(vdev_t *vd) 2726{ 2727 uint64_t state = vd->vdev_state; 2728 2729 /* 2730 * We currently allow allocations from vdevs which may be in the 2731 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2732 * fails to reopen then we'll catch it later when we're holding 2733 * the proper locks. Note that we have to get the vdev state 2734 * in a local variable because although it changes atomically, 2735 * we're asking two separate questions about it. 2736 */ 2737 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2738 !vd->vdev_cant_write && !vd->vdev_ishole); 2739} 2740 2741boolean_t 2742vdev_accessible(vdev_t *vd, zio_t *zio) 2743{ 2744 ASSERT(zio->io_vd == vd); 2745 2746 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2747 return (B_FALSE); 2748 2749 if (zio->io_type == ZIO_TYPE_READ) 2750 return (!vd->vdev_cant_read); 2751 2752 if (zio->io_type == ZIO_TYPE_WRITE) 2753 return (!vd->vdev_cant_write); 2754 2755 return (B_TRUE); 2756} 2757 2758/* 2759 * Get statistics for the given vdev. 2760 */ 2761void 2762vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2763{ 2764 spa_t *spa = vd->vdev_spa; 2765 vdev_t *rvd = spa->spa_root_vdev; 2766 2767 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2768 2769 mutex_enter(&vd->vdev_stat_lock); 2770 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2771 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2772 vs->vs_state = vd->vdev_state; 2773 vs->vs_rsize = vdev_get_min_asize(vd); 2774 if (vd->vdev_ops->vdev_op_leaf) 2775 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2776 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize; 2777 vs->vs_configured_ashift = vd->vdev_top != NULL 2778 ? vd->vdev_top->vdev_ashift : vd->vdev_ashift; 2779 vs->vs_logical_ashift = vd->vdev_logical_ashift; 2780 vs->vs_physical_ashift = vd->vdev_physical_ashift; 2781 if (vd->vdev_aux == NULL && vd == vd->vdev_top && !vd->vdev_ishole) { 2782 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation; 2783 } 2784 2785 /* 2786 * If we're getting stats on the root vdev, aggregate the I/O counts 2787 * over all top-level vdevs (i.e. the direct children of the root). 2788 */ 2789 if (vd == rvd) { 2790 for (int c = 0; c < rvd->vdev_children; c++) { 2791 vdev_t *cvd = rvd->vdev_child[c]; 2792 vdev_stat_t *cvs = &cvd->vdev_stat; 2793 2794 for (int t = 0; t < ZIO_TYPES; t++) { 2795 vs->vs_ops[t] += cvs->vs_ops[t]; 2796 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2797 } 2798 cvs->vs_scan_removing = cvd->vdev_removing; 2799 } 2800 } 2801 mutex_exit(&vd->vdev_stat_lock); 2802} 2803 2804void 2805vdev_clear_stats(vdev_t *vd) 2806{ 2807 mutex_enter(&vd->vdev_stat_lock); 2808 vd->vdev_stat.vs_space = 0; 2809 vd->vdev_stat.vs_dspace = 0; 2810 vd->vdev_stat.vs_alloc = 0; 2811 mutex_exit(&vd->vdev_stat_lock); 2812} 2813 2814void 2815vdev_scan_stat_init(vdev_t *vd) 2816{ 2817 vdev_stat_t *vs = &vd->vdev_stat; 2818 2819 for (int c = 0; c < vd->vdev_children; c++) 2820 vdev_scan_stat_init(vd->vdev_child[c]); 2821 2822 mutex_enter(&vd->vdev_stat_lock); 2823 vs->vs_scan_processed = 0; 2824 mutex_exit(&vd->vdev_stat_lock); 2825} 2826 2827void 2828vdev_stat_update(zio_t *zio, uint64_t psize) 2829{ 2830 spa_t *spa = zio->io_spa; 2831 vdev_t *rvd = spa->spa_root_vdev; 2832 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2833 vdev_t *pvd; 2834 uint64_t txg = zio->io_txg; 2835 vdev_stat_t *vs = &vd->vdev_stat; 2836 zio_type_t type = zio->io_type; 2837 int flags = zio->io_flags; 2838 2839 /* 2840 * If this i/o is a gang leader, it didn't do any actual work. 2841 */ 2842 if (zio->io_gang_tree) 2843 return; 2844 2845 if (zio->io_error == 0) { 2846 /* 2847 * If this is a root i/o, don't count it -- we've already 2848 * counted the top-level vdevs, and vdev_get_stats() will 2849 * aggregate them when asked. This reduces contention on 2850 * the root vdev_stat_lock and implicitly handles blocks 2851 * that compress away to holes, for which there is no i/o. 2852 * (Holes never create vdev children, so all the counters 2853 * remain zero, which is what we want.) 2854 * 2855 * Note: this only applies to successful i/o (io_error == 0) 2856 * because unlike i/o counts, errors are not additive. 2857 * When reading a ditto block, for example, failure of 2858 * one top-level vdev does not imply a root-level error. 2859 */ 2860 if (vd == rvd) 2861 return; 2862 2863 ASSERT(vd == zio->io_vd); 2864 2865 if (flags & ZIO_FLAG_IO_BYPASS) 2866 return; 2867 2868 mutex_enter(&vd->vdev_stat_lock); 2869 2870 if (flags & ZIO_FLAG_IO_REPAIR) { 2871 if (flags & ZIO_FLAG_SCAN_THREAD) { 2872 dsl_scan_phys_t *scn_phys = 2873 &spa->spa_dsl_pool->dp_scan->scn_phys; 2874 uint64_t *processed = &scn_phys->scn_processed; 2875 2876 /* XXX cleanup? */ 2877 if (vd->vdev_ops->vdev_op_leaf) 2878 atomic_add_64(processed, psize); 2879 vs->vs_scan_processed += psize; 2880 } 2881 2882 if (flags & ZIO_FLAG_SELF_HEAL) 2883 vs->vs_self_healed += psize; 2884 } 2885 2886 vs->vs_ops[type]++; 2887 vs->vs_bytes[type] += psize; 2888 2889 mutex_exit(&vd->vdev_stat_lock); 2890 return; 2891 } 2892 2893 if (flags & ZIO_FLAG_SPECULATIVE) 2894 return; 2895 2896 /* 2897 * If this is an I/O error that is going to be retried, then ignore the 2898 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2899 * hard errors, when in reality they can happen for any number of 2900 * innocuous reasons (bus resets, MPxIO link failure, etc). 2901 */ 2902 if (zio->io_error == EIO && 2903 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2904 return; 2905 2906 /* 2907 * Intent logs writes won't propagate their error to the root 2908 * I/O so don't mark these types of failures as pool-level 2909 * errors. 2910 */ 2911 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2912 return; 2913 2914 mutex_enter(&vd->vdev_stat_lock); 2915 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2916 if (zio->io_error == ECKSUM) 2917 vs->vs_checksum_errors++; 2918 else 2919 vs->vs_read_errors++; 2920 } 2921 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2922 vs->vs_write_errors++; 2923 mutex_exit(&vd->vdev_stat_lock); 2924 2925 if (type == ZIO_TYPE_WRITE && txg != 0 && 2926 (!(flags & ZIO_FLAG_IO_REPAIR) || 2927 (flags & ZIO_FLAG_SCAN_THREAD) || 2928 spa->spa_claiming)) { 2929 /* 2930 * This is either a normal write (not a repair), or it's 2931 * a repair induced by the scrub thread, or it's a repair 2932 * made by zil_claim() during spa_load() in the first txg. 2933 * In the normal case, we commit the DTL change in the same 2934 * txg as the block was born. In the scrub-induced repair 2935 * case, we know that scrubs run in first-pass syncing context, 2936 * so we commit the DTL change in spa_syncing_txg(spa). 2937 * In the zil_claim() case, we commit in spa_first_txg(spa). 2938 * 2939 * We currently do not make DTL entries for failed spontaneous 2940 * self-healing writes triggered by normal (non-scrubbing) 2941 * reads, because we have no transactional context in which to 2942 * do so -- and it's not clear that it'd be desirable anyway. 2943 */ 2944 if (vd->vdev_ops->vdev_op_leaf) { 2945 uint64_t commit_txg = txg; 2946 if (flags & ZIO_FLAG_SCAN_THREAD) { 2947 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2948 ASSERT(spa_sync_pass(spa) == 1); 2949 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 2950 commit_txg = spa_syncing_txg(spa); 2951 } else if (spa->spa_claiming) { 2952 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2953 commit_txg = spa_first_txg(spa); 2954 } 2955 ASSERT(commit_txg >= spa_syncing_txg(spa)); 2956 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 2957 return; 2958 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2959 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 2960 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 2961 } 2962 if (vd != rvd) 2963 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 2964 } 2965} 2966 2967/* 2968 * Update the in-core space usage stats for this vdev, its metaslab class, 2969 * and the root vdev. 2970 */ 2971void 2972vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 2973 int64_t space_delta) 2974{ 2975 int64_t dspace_delta = space_delta; 2976 spa_t *spa = vd->vdev_spa; 2977 vdev_t *rvd = spa->spa_root_vdev; 2978 metaslab_group_t *mg = vd->vdev_mg; 2979 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 2980 2981 ASSERT(vd == vd->vdev_top); 2982 2983 /* 2984 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 2985 * factor. We must calculate this here and not at the root vdev 2986 * because the root vdev's psize-to-asize is simply the max of its 2987 * childrens', thus not accurate enough for us. 2988 */ 2989 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 2990 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 2991 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 2992 vd->vdev_deflate_ratio; 2993 2994 mutex_enter(&vd->vdev_stat_lock); 2995 vd->vdev_stat.vs_alloc += alloc_delta; 2996 vd->vdev_stat.vs_space += space_delta; 2997 vd->vdev_stat.vs_dspace += dspace_delta; 2998 mutex_exit(&vd->vdev_stat_lock); 2999 3000 if (mc == spa_normal_class(spa)) { 3001 mutex_enter(&rvd->vdev_stat_lock); 3002 rvd->vdev_stat.vs_alloc += alloc_delta; 3003 rvd->vdev_stat.vs_space += space_delta; 3004 rvd->vdev_stat.vs_dspace += dspace_delta; 3005 mutex_exit(&rvd->vdev_stat_lock); 3006 } 3007 3008 if (mc != NULL) { 3009 ASSERT(rvd == vd->vdev_parent); 3010 ASSERT(vd->vdev_ms_count != 0); 3011 3012 metaslab_class_space_update(mc, 3013 alloc_delta, defer_delta, space_delta, dspace_delta); 3014 } 3015} 3016 3017/* 3018 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3019 * so that it will be written out next time the vdev configuration is synced. 3020 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3021 */ 3022void 3023vdev_config_dirty(vdev_t *vd) 3024{ 3025 spa_t *spa = vd->vdev_spa; 3026 vdev_t *rvd = spa->spa_root_vdev; 3027 int c; 3028 3029 ASSERT(spa_writeable(spa)); 3030 3031 /* 3032 * If this is an aux vdev (as with l2cache and spare devices), then we 3033 * update the vdev config manually and set the sync flag. 3034 */ 3035 if (vd->vdev_aux != NULL) { 3036 spa_aux_vdev_t *sav = vd->vdev_aux; 3037 nvlist_t **aux; 3038 uint_t naux; 3039 3040 for (c = 0; c < sav->sav_count; c++) { 3041 if (sav->sav_vdevs[c] == vd) 3042 break; 3043 } 3044 3045 if (c == sav->sav_count) { 3046 /* 3047 * We're being removed. There's nothing more to do. 3048 */ 3049 ASSERT(sav->sav_sync == B_TRUE); 3050 return; 3051 } 3052 3053 sav->sav_sync = B_TRUE; 3054 3055 if (nvlist_lookup_nvlist_array(sav->sav_config, 3056 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3057 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3058 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3059 } 3060 3061 ASSERT(c < naux); 3062 3063 /* 3064 * Setting the nvlist in the middle if the array is a little 3065 * sketchy, but it will work. 3066 */ 3067 nvlist_free(aux[c]); 3068 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3069 3070 return; 3071 } 3072 3073 /* 3074 * The dirty list is protected by the SCL_CONFIG lock. The caller 3075 * must either hold SCL_CONFIG as writer, or must be the sync thread 3076 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3077 * so this is sufficient to ensure mutual exclusion. 3078 */ 3079 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3080 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3081 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3082 3083 if (vd == rvd) { 3084 for (c = 0; c < rvd->vdev_children; c++) 3085 vdev_config_dirty(rvd->vdev_child[c]); 3086 } else { 3087 ASSERT(vd == vd->vdev_top); 3088 3089 if (!list_link_active(&vd->vdev_config_dirty_node) && 3090 !vd->vdev_ishole) 3091 list_insert_head(&spa->spa_config_dirty_list, vd); 3092 } 3093} 3094 3095void 3096vdev_config_clean(vdev_t *vd) 3097{ 3098 spa_t *spa = vd->vdev_spa; 3099 3100 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3101 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3102 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3103 3104 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3105 list_remove(&spa->spa_config_dirty_list, vd); 3106} 3107 3108/* 3109 * Mark a top-level vdev's state as dirty, so that the next pass of 3110 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3111 * the state changes from larger config changes because they require 3112 * much less locking, and are often needed for administrative actions. 3113 */ 3114void 3115vdev_state_dirty(vdev_t *vd) 3116{ 3117 spa_t *spa = vd->vdev_spa; 3118 3119 ASSERT(spa_writeable(spa)); 3120 ASSERT(vd == vd->vdev_top); 3121 3122 /* 3123 * The state list is protected by the SCL_STATE lock. The caller 3124 * must either hold SCL_STATE as writer, or must be the sync thread 3125 * (which holds SCL_STATE as reader). There's only one sync thread, 3126 * so this is sufficient to ensure mutual exclusion. 3127 */ 3128 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3129 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3130 spa_config_held(spa, SCL_STATE, RW_READER))); 3131 3132 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 3133 list_insert_head(&spa->spa_state_dirty_list, vd); 3134} 3135 3136void 3137vdev_state_clean(vdev_t *vd) 3138{ 3139 spa_t *spa = vd->vdev_spa; 3140 3141 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3142 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3143 spa_config_held(spa, SCL_STATE, RW_READER))); 3144 3145 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3146 list_remove(&spa->spa_state_dirty_list, vd); 3147} 3148 3149/* 3150 * Propagate vdev state up from children to parent. 3151 */ 3152void 3153vdev_propagate_state(vdev_t *vd) 3154{ 3155 spa_t *spa = vd->vdev_spa; 3156 vdev_t *rvd = spa->spa_root_vdev; 3157 int degraded = 0, faulted = 0; 3158 int corrupted = 0; 3159 vdev_t *child; 3160 3161 if (vd->vdev_children > 0) { 3162 for (int c = 0; c < vd->vdev_children; c++) { 3163 child = vd->vdev_child[c]; 3164 3165 /* 3166 * Don't factor holes into the decision. 3167 */ 3168 if (child->vdev_ishole) 3169 continue; 3170 3171 if (!vdev_readable(child) || 3172 (!vdev_writeable(child) && spa_writeable(spa))) { 3173 /* 3174 * Root special: if there is a top-level log 3175 * device, treat the root vdev as if it were 3176 * degraded. 3177 */ 3178 if (child->vdev_islog && vd == rvd) 3179 degraded++; 3180 else 3181 faulted++; 3182 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3183 degraded++; 3184 } 3185 3186 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3187 corrupted++; 3188 } 3189 3190 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3191 3192 /* 3193 * Root special: if there is a top-level vdev that cannot be 3194 * opened due to corrupted metadata, then propagate the root 3195 * vdev's aux state as 'corrupt' rather than 'insufficient 3196 * replicas'. 3197 */ 3198 if (corrupted && vd == rvd && 3199 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3200 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3201 VDEV_AUX_CORRUPT_DATA); 3202 } 3203 3204 if (vd->vdev_parent) 3205 vdev_propagate_state(vd->vdev_parent); 3206} 3207 3208/* 3209 * Set a vdev's state. If this is during an open, we don't update the parent 3210 * state, because we're in the process of opening children depth-first. 3211 * Otherwise, we propagate the change to the parent. 3212 * 3213 * If this routine places a device in a faulted state, an appropriate ereport is 3214 * generated. 3215 */ 3216void 3217vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 3218{ 3219 uint64_t save_state; 3220 spa_t *spa = vd->vdev_spa; 3221 3222 if (state == vd->vdev_state) { 3223 vd->vdev_stat.vs_aux = aux; 3224 return; 3225 } 3226 3227 save_state = vd->vdev_state; 3228 3229 vd->vdev_state = state; 3230 vd->vdev_stat.vs_aux = aux; 3231 3232 /* 3233 * If we are setting the vdev state to anything but an open state, then 3234 * always close the underlying device unless the device has requested 3235 * a delayed close (i.e. we're about to remove or fault the device). 3236 * Otherwise, we keep accessible but invalid devices open forever. 3237 * We don't call vdev_close() itself, because that implies some extra 3238 * checks (offline, etc) that we don't want here. This is limited to 3239 * leaf devices, because otherwise closing the device will affect other 3240 * children. 3241 */ 3242 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 3243 vd->vdev_ops->vdev_op_leaf) 3244 vd->vdev_ops->vdev_op_close(vd); 3245 3246 /* 3247 * If we have brought this vdev back into service, we need 3248 * to notify fmd so that it can gracefully repair any outstanding 3249 * cases due to a missing device. We do this in all cases, even those 3250 * that probably don't correlate to a repaired fault. This is sure to 3251 * catch all cases, and we let the zfs-retire agent sort it out. If 3252 * this is a transient state it's OK, as the retire agent will 3253 * double-check the state of the vdev before repairing it. 3254 */ 3255 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 3256 vd->vdev_prevstate != state) 3257 zfs_post_state_change(spa, vd); 3258 3259 if (vd->vdev_removed && 3260 state == VDEV_STATE_CANT_OPEN && 3261 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 3262 /* 3263 * If the previous state is set to VDEV_STATE_REMOVED, then this 3264 * device was previously marked removed and someone attempted to 3265 * reopen it. If this failed due to a nonexistent device, then 3266 * keep the device in the REMOVED state. We also let this be if 3267 * it is one of our special test online cases, which is only 3268 * attempting to online the device and shouldn't generate an FMA 3269 * fault. 3270 */ 3271 vd->vdev_state = VDEV_STATE_REMOVED; 3272 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 3273 } else if (state == VDEV_STATE_REMOVED) { 3274 vd->vdev_removed = B_TRUE; 3275 } else if (state == VDEV_STATE_CANT_OPEN) { 3276 /* 3277 * If we fail to open a vdev during an import or recovery, we 3278 * mark it as "not available", which signifies that it was 3279 * never there to begin with. Failure to open such a device 3280 * is not considered an error. 3281 */ 3282 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 3283 spa_load_state(spa) == SPA_LOAD_RECOVER) && 3284 vd->vdev_ops->vdev_op_leaf) 3285 vd->vdev_not_present = 1; 3286 3287 /* 3288 * Post the appropriate ereport. If the 'prevstate' field is 3289 * set to something other than VDEV_STATE_UNKNOWN, it indicates 3290 * that this is part of a vdev_reopen(). In this case, we don't 3291 * want to post the ereport if the device was already in the 3292 * CANT_OPEN state beforehand. 3293 * 3294 * If the 'checkremove' flag is set, then this is an attempt to 3295 * online the device in response to an insertion event. If we 3296 * hit this case, then we have detected an insertion event for a 3297 * faulted or offline device that wasn't in the removed state. 3298 * In this scenario, we don't post an ereport because we are 3299 * about to replace the device, or attempt an online with 3300 * vdev_forcefault, which will generate the fault for us. 3301 */ 3302 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 3303 !vd->vdev_not_present && !vd->vdev_checkremove && 3304 vd != spa->spa_root_vdev) { 3305 const char *class; 3306 3307 switch (aux) { 3308 case VDEV_AUX_OPEN_FAILED: 3309 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 3310 break; 3311 case VDEV_AUX_CORRUPT_DATA: 3312 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3313 break; 3314 case VDEV_AUX_NO_REPLICAS: 3315 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3316 break; 3317 case VDEV_AUX_BAD_GUID_SUM: 3318 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3319 break; 3320 case VDEV_AUX_TOO_SMALL: 3321 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3322 break; 3323 case VDEV_AUX_BAD_LABEL: 3324 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3325 break; 3326 default: 3327 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3328 } 3329 3330 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3331 } 3332 3333 /* Erase any notion of persistent removed state */ 3334 vd->vdev_removed = B_FALSE; 3335 } else { 3336 vd->vdev_removed = B_FALSE; 3337 } 3338 3339 if (!isopen && vd->vdev_parent) 3340 vdev_propagate_state(vd->vdev_parent); 3341} 3342 3343/* 3344 * Check the vdev configuration to ensure that it's capable of supporting 3345 * a root pool. 3346 * 3347 * On Solaris, we do not support RAID-Z or partial configuration. In 3348 * addition, only a single top-level vdev is allowed and none of the 3349 * leaves can be wholedisks. 3350 * 3351 * For FreeBSD, we can boot from any configuration. There is a 3352 * limitation that the boot filesystem must be either uncompressed or 3353 * compresses with lzjb compression but I'm not sure how to enforce 3354 * that here. 3355 */ 3356boolean_t 3357vdev_is_bootable(vdev_t *vd) 3358{ 3359#ifdef sun 3360 if (!vd->vdev_ops->vdev_op_leaf) { 3361 char *vdev_type = vd->vdev_ops->vdev_op_type; 3362 3363 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3364 vd->vdev_children > 1) { 3365 return (B_FALSE); 3366 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3367 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3368 return (B_FALSE); 3369 } 3370 } else if (vd->vdev_wholedisk == 1) { 3371 return (B_FALSE); 3372 } 3373 3374 for (int c = 0; c < vd->vdev_children; c++) { 3375 if (!vdev_is_bootable(vd->vdev_child[c])) 3376 return (B_FALSE); 3377 } 3378#endif /* sun */ 3379 return (B_TRUE); 3380} 3381 3382/* 3383 * Load the state from the original vdev tree (ovd) which 3384 * we've retrieved from the MOS config object. If the original 3385 * vdev was offline or faulted then we transfer that state to the 3386 * device in the current vdev tree (nvd). 3387 */ 3388void 3389vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3390{ 3391 spa_t *spa = nvd->vdev_spa; 3392 3393 ASSERT(nvd->vdev_top->vdev_islog); 3394 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3395 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3396 3397 for (int c = 0; c < nvd->vdev_children; c++) 3398 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3399 3400 if (nvd->vdev_ops->vdev_op_leaf) { 3401 /* 3402 * Restore the persistent vdev state 3403 */ 3404 nvd->vdev_offline = ovd->vdev_offline; 3405 nvd->vdev_faulted = ovd->vdev_faulted; 3406 nvd->vdev_degraded = ovd->vdev_degraded; 3407 nvd->vdev_removed = ovd->vdev_removed; 3408 } 3409} 3410 3411/* 3412 * Determine if a log device has valid content. If the vdev was 3413 * removed or faulted in the MOS config then we know that 3414 * the content on the log device has already been written to the pool. 3415 */ 3416boolean_t 3417vdev_log_state_valid(vdev_t *vd) 3418{ 3419 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3420 !vd->vdev_removed) 3421 return (B_TRUE); 3422 3423 for (int c = 0; c < vd->vdev_children; c++) 3424 if (vdev_log_state_valid(vd->vdev_child[c])) 3425 return (B_TRUE); 3426 3427 return (B_FALSE); 3428} 3429 3430/* 3431 * Expand a vdev if possible. 3432 */ 3433void 3434vdev_expand(vdev_t *vd, uint64_t txg) 3435{ 3436 ASSERT(vd->vdev_top == vd); 3437 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3438 3439 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3440 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3441 vdev_config_dirty(vd); 3442 } 3443} 3444 3445/* 3446 * Split a vdev. 3447 */ 3448void 3449vdev_split(vdev_t *vd) 3450{ 3451 vdev_t *cvd, *pvd = vd->vdev_parent; 3452 3453 vdev_remove_child(pvd, vd); 3454 vdev_compact_children(pvd); 3455 3456 cvd = pvd->vdev_child[0]; 3457 if (pvd->vdev_children == 1) { 3458 vdev_remove_parent(cvd); 3459 cvd->vdev_splitting = B_TRUE; 3460 } 3461 vdev_propagate_state(cvd); 3462} 3463 3464void 3465vdev_deadman(vdev_t *vd) 3466{ 3467 for (int c = 0; c < vd->vdev_children; c++) { 3468 vdev_t *cvd = vd->vdev_child[c]; 3469 3470 vdev_deadman(cvd); 3471 } 3472 3473 if (vd->vdev_ops->vdev_op_leaf) { 3474 vdev_queue_t *vq = &vd->vdev_queue; 3475 3476 mutex_enter(&vq->vq_lock); 3477 if (avl_numnodes(&vq->vq_active_tree) > 0) { 3478 spa_t *spa = vd->vdev_spa; 3479 zio_t *fio; 3480 uint64_t delta; 3481 3482 /* 3483 * Look at the head of all the pending queues, 3484 * if any I/O has been outstanding for longer than 3485 * the spa_deadman_synctime we panic the system. 3486 */ 3487 fio = avl_first(&vq->vq_active_tree); 3488 delta = gethrtime() - fio->io_timestamp; 3489 if (delta > spa_deadman_synctime(spa)) { 3490 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, " 3491 "delta %lluns, last io %lluns", 3492 fio->io_timestamp, delta, 3493 vq->vq_io_complete_ts); 3494 fm_panic("I/O to pool '%s' appears to be " 3495 "hung on vdev guid %llu at '%s'.", 3496 spa_name(spa), 3497 (long long unsigned int) vd->vdev_guid, 3498 vd->vdev_path); 3499 } 3500 } 3501 mutex_exit(&vq->vq_lock); 3502 } 3503} 3504