vdev.c revision 319625
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 26 * Copyright 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 * Copyright (c) 2014 Integros [integros.com] 28 */ 29 30#include <sys/zfs_context.h> 31#include <sys/fm/fs/zfs.h> 32#include <sys/spa.h> 33#include <sys/spa_impl.h> 34#include <sys/dmu.h> 35#include <sys/dmu_tx.h> 36#include <sys/vdev_impl.h> 37#include <sys/uberblock_impl.h> 38#include <sys/metaslab.h> 39#include <sys/metaslab_impl.h> 40#include <sys/space_map.h> 41#include <sys/space_reftree.h> 42#include <sys/zio.h> 43#include <sys/zap.h> 44#include <sys/fs/zfs.h> 45#include <sys/arc.h> 46#include <sys/zil.h> 47#include <sys/dsl_scan.h> 48#include <sys/trim_map.h> 49 50SYSCTL_DECL(_vfs_zfs); 51SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 52 53/* 54 * Virtual device management. 55 */ 56 57/* 58 * The limit for ZFS to automatically increase a top-level vdev's ashift 59 * from logical ashift to physical ashift. 60 * 61 * Example: one or more 512B emulation child vdevs 62 * child->vdev_ashift = 9 (512 bytes) 63 * child->vdev_physical_ashift = 12 (4096 bytes) 64 * zfs_max_auto_ashift = 11 (2048 bytes) 65 * zfs_min_auto_ashift = 9 (512 bytes) 66 * 67 * On pool creation or the addition of a new top-level vdev, ZFS will 68 * increase the ashift of the top-level vdev to 2048 as limited by 69 * zfs_max_auto_ashift. 70 * 71 * Example: one or more 512B emulation child vdevs 72 * child->vdev_ashift = 9 (512 bytes) 73 * child->vdev_physical_ashift = 12 (4096 bytes) 74 * zfs_max_auto_ashift = 13 (8192 bytes) 75 * zfs_min_auto_ashift = 9 (512 bytes) 76 * 77 * On pool creation or the addition of a new top-level vdev, ZFS will 78 * increase the ashift of the top-level vdev to 4096 to match the 79 * max vdev_physical_ashift. 80 * 81 * Example: one or more 512B emulation child vdevs 82 * child->vdev_ashift = 9 (512 bytes) 83 * child->vdev_physical_ashift = 9 (512 bytes) 84 * zfs_max_auto_ashift = 13 (8192 bytes) 85 * zfs_min_auto_ashift = 12 (4096 bytes) 86 * 87 * On pool creation or the addition of a new top-level vdev, ZFS will 88 * increase the ashift of the top-level vdev to 4096 to match the 89 * zfs_min_auto_ashift. 90 */ 91static uint64_t zfs_max_auto_ashift = SPA_MAXASHIFT; 92static uint64_t zfs_min_auto_ashift = SPA_MINASHIFT; 93 94static int 95sysctl_vfs_zfs_max_auto_ashift(SYSCTL_HANDLER_ARGS) 96{ 97 uint64_t val; 98 int err; 99 100 val = zfs_max_auto_ashift; 101 err = sysctl_handle_64(oidp, &val, 0, req); 102 if (err != 0 || req->newptr == NULL) 103 return (err); 104 105 if (val > SPA_MAXASHIFT || val < zfs_min_auto_ashift) 106 return (EINVAL); 107 108 zfs_max_auto_ashift = val; 109 110 return (0); 111} 112SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift, 113 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 114 sysctl_vfs_zfs_max_auto_ashift, "QU", 115 "Max ashift used when optimising for logical -> physical sectors size on " 116 "new top-level vdevs."); 117 118static int 119sysctl_vfs_zfs_min_auto_ashift(SYSCTL_HANDLER_ARGS) 120{ 121 uint64_t val; 122 int err; 123 124 val = zfs_min_auto_ashift; 125 err = sysctl_handle_64(oidp, &val, 0, req); 126 if (err != 0 || req->newptr == NULL) 127 return (err); 128 129 if (val < SPA_MINASHIFT || val > zfs_max_auto_ashift) 130 return (EINVAL); 131 132 zfs_min_auto_ashift = val; 133 134 return (0); 135} 136SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift, 137 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 138 sysctl_vfs_zfs_min_auto_ashift, "QU", 139 "Min ashift used when creating new top-level vdevs."); 140 141static vdev_ops_t *vdev_ops_table[] = { 142 &vdev_root_ops, 143 &vdev_raidz_ops, 144 &vdev_mirror_ops, 145 &vdev_replacing_ops, 146 &vdev_spare_ops, 147#ifdef _KERNEL 148 &vdev_geom_ops, 149#else 150 &vdev_disk_ops, 151#endif 152 &vdev_file_ops, 153 &vdev_missing_ops, 154 &vdev_hole_ops, 155 NULL 156}; 157 158 159/* 160 * When a vdev is added, it will be divided into approximately (but no 161 * more than) this number of metaslabs. 162 */ 163int metaslabs_per_vdev = 200; 164SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, metaslabs_per_vdev, CTLFLAG_RDTUN, 165 &metaslabs_per_vdev, 0, 166 "When a vdev is added, how many metaslabs the vdev should be divided into"); 167 168/* 169 * Given a vdev type, return the appropriate ops vector. 170 */ 171static vdev_ops_t * 172vdev_getops(const char *type) 173{ 174 vdev_ops_t *ops, **opspp; 175 176 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 177 if (strcmp(ops->vdev_op_type, type) == 0) 178 break; 179 180 return (ops); 181} 182 183/* 184 * Default asize function: return the MAX of psize with the asize of 185 * all children. This is what's used by anything other than RAID-Z. 186 */ 187uint64_t 188vdev_default_asize(vdev_t *vd, uint64_t psize) 189{ 190 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 191 uint64_t csize; 192 193 for (int c = 0; c < vd->vdev_children; c++) { 194 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 195 asize = MAX(asize, csize); 196 } 197 198 return (asize); 199} 200 201/* 202 * Get the minimum allocatable size. We define the allocatable size as 203 * the vdev's asize rounded to the nearest metaslab. This allows us to 204 * replace or attach devices which don't have the same physical size but 205 * can still satisfy the same number of allocations. 206 */ 207uint64_t 208vdev_get_min_asize(vdev_t *vd) 209{ 210 vdev_t *pvd = vd->vdev_parent; 211 212 /* 213 * If our parent is NULL (inactive spare or cache) or is the root, 214 * just return our own asize. 215 */ 216 if (pvd == NULL) 217 return (vd->vdev_asize); 218 219 /* 220 * The top-level vdev just returns the allocatable size rounded 221 * to the nearest metaslab. 222 */ 223 if (vd == vd->vdev_top) 224 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 225 226 /* 227 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 228 * so each child must provide at least 1/Nth of its asize. 229 */ 230 if (pvd->vdev_ops == &vdev_raidz_ops) 231 return (pvd->vdev_min_asize / pvd->vdev_children); 232 233 return (pvd->vdev_min_asize); 234} 235 236void 237vdev_set_min_asize(vdev_t *vd) 238{ 239 vd->vdev_min_asize = vdev_get_min_asize(vd); 240 241 for (int c = 0; c < vd->vdev_children; c++) 242 vdev_set_min_asize(vd->vdev_child[c]); 243} 244 245vdev_t * 246vdev_lookup_top(spa_t *spa, uint64_t vdev) 247{ 248 vdev_t *rvd = spa->spa_root_vdev; 249 250 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 251 252 if (vdev < rvd->vdev_children) { 253 ASSERT(rvd->vdev_child[vdev] != NULL); 254 return (rvd->vdev_child[vdev]); 255 } 256 257 return (NULL); 258} 259 260vdev_t * 261vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 262{ 263 vdev_t *mvd; 264 265 if (vd->vdev_guid == guid) 266 return (vd); 267 268 for (int c = 0; c < vd->vdev_children; c++) 269 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 270 NULL) 271 return (mvd); 272 273 return (NULL); 274} 275 276static int 277vdev_count_leaves_impl(vdev_t *vd) 278{ 279 int n = 0; 280 281 if (vd->vdev_ops->vdev_op_leaf) 282 return (1); 283 284 for (int c = 0; c < vd->vdev_children; c++) 285 n += vdev_count_leaves_impl(vd->vdev_child[c]); 286 287 return (n); 288} 289 290int 291vdev_count_leaves(spa_t *spa) 292{ 293 return (vdev_count_leaves_impl(spa->spa_root_vdev)); 294} 295 296void 297vdev_add_child(vdev_t *pvd, vdev_t *cvd) 298{ 299 size_t oldsize, newsize; 300 uint64_t id = cvd->vdev_id; 301 vdev_t **newchild; 302 spa_t *spa = cvd->vdev_spa; 303 304 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 305 ASSERT(cvd->vdev_parent == NULL); 306 307 cvd->vdev_parent = pvd; 308 309 if (pvd == NULL) 310 return; 311 312 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 313 314 oldsize = pvd->vdev_children * sizeof (vdev_t *); 315 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 316 newsize = pvd->vdev_children * sizeof (vdev_t *); 317 318 newchild = kmem_zalloc(newsize, KM_SLEEP); 319 if (pvd->vdev_child != NULL) { 320 bcopy(pvd->vdev_child, newchild, oldsize); 321 kmem_free(pvd->vdev_child, oldsize); 322 } 323 324 pvd->vdev_child = newchild; 325 pvd->vdev_child[id] = cvd; 326 327 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 328 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 329 330 /* 331 * Walk up all ancestors to update guid sum. 332 */ 333 for (; pvd != NULL; pvd = pvd->vdev_parent) 334 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 335} 336 337void 338vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 339{ 340 int c; 341 uint_t id = cvd->vdev_id; 342 343 ASSERT(cvd->vdev_parent == pvd); 344 345 if (pvd == NULL) 346 return; 347 348 ASSERT(id < pvd->vdev_children); 349 ASSERT(pvd->vdev_child[id] == cvd); 350 351 pvd->vdev_child[id] = NULL; 352 cvd->vdev_parent = NULL; 353 354 for (c = 0; c < pvd->vdev_children; c++) 355 if (pvd->vdev_child[c]) 356 break; 357 358 if (c == pvd->vdev_children) { 359 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 360 pvd->vdev_child = NULL; 361 pvd->vdev_children = 0; 362 } 363 364 /* 365 * Walk up all ancestors to update guid sum. 366 */ 367 for (; pvd != NULL; pvd = pvd->vdev_parent) 368 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 369} 370 371/* 372 * Remove any holes in the child array. 373 */ 374void 375vdev_compact_children(vdev_t *pvd) 376{ 377 vdev_t **newchild, *cvd; 378 int oldc = pvd->vdev_children; 379 int newc; 380 381 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 382 383 for (int c = newc = 0; c < oldc; c++) 384 if (pvd->vdev_child[c]) 385 newc++; 386 387 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 388 389 for (int c = newc = 0; c < oldc; c++) { 390 if ((cvd = pvd->vdev_child[c]) != NULL) { 391 newchild[newc] = cvd; 392 cvd->vdev_id = newc++; 393 } 394 } 395 396 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 397 pvd->vdev_child = newchild; 398 pvd->vdev_children = newc; 399} 400 401/* 402 * Allocate and minimally initialize a vdev_t. 403 */ 404vdev_t * 405vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 406{ 407 vdev_t *vd; 408 409 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 410 411 if (spa->spa_root_vdev == NULL) { 412 ASSERT(ops == &vdev_root_ops); 413 spa->spa_root_vdev = vd; 414 spa->spa_load_guid = spa_generate_guid(NULL); 415 } 416 417 if (guid == 0 && ops != &vdev_hole_ops) { 418 if (spa->spa_root_vdev == vd) { 419 /* 420 * The root vdev's guid will also be the pool guid, 421 * which must be unique among all pools. 422 */ 423 guid = spa_generate_guid(NULL); 424 } else { 425 /* 426 * Any other vdev's guid must be unique within the pool. 427 */ 428 guid = spa_generate_guid(spa); 429 } 430 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 431 } 432 433 vd->vdev_spa = spa; 434 vd->vdev_id = id; 435 vd->vdev_guid = guid; 436 vd->vdev_guid_sum = guid; 437 vd->vdev_ops = ops; 438 vd->vdev_state = VDEV_STATE_CLOSED; 439 vd->vdev_ishole = (ops == &vdev_hole_ops); 440 441 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 442 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 443 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 444 mutex_init(&vd->vdev_queue_lock, NULL, MUTEX_DEFAULT, NULL); 445 for (int t = 0; t < DTL_TYPES; t++) { 446 vd->vdev_dtl[t] = range_tree_create(NULL, NULL, 447 &vd->vdev_dtl_lock); 448 } 449 txg_list_create(&vd->vdev_ms_list, 450 offsetof(struct metaslab, ms_txg_node)); 451 txg_list_create(&vd->vdev_dtl_list, 452 offsetof(struct vdev, vdev_dtl_node)); 453 vd->vdev_stat.vs_timestamp = gethrtime(); 454 vdev_queue_init(vd); 455 vdev_cache_init(vd); 456 457 return (vd); 458} 459 460/* 461 * Allocate a new vdev. The 'alloctype' is used to control whether we are 462 * creating a new vdev or loading an existing one - the behavior is slightly 463 * different for each case. 464 */ 465int 466vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 467 int alloctype) 468{ 469 vdev_ops_t *ops; 470 char *type; 471 uint64_t guid = 0, islog, nparity; 472 vdev_t *vd; 473 474 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 475 476 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 477 return (SET_ERROR(EINVAL)); 478 479 if ((ops = vdev_getops(type)) == NULL) 480 return (SET_ERROR(EINVAL)); 481 482 /* 483 * If this is a load, get the vdev guid from the nvlist. 484 * Otherwise, vdev_alloc_common() will generate one for us. 485 */ 486 if (alloctype == VDEV_ALLOC_LOAD) { 487 uint64_t label_id; 488 489 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 490 label_id != id) 491 return (SET_ERROR(EINVAL)); 492 493 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 494 return (SET_ERROR(EINVAL)); 495 } else if (alloctype == VDEV_ALLOC_SPARE) { 496 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 497 return (SET_ERROR(EINVAL)); 498 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 499 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 500 return (SET_ERROR(EINVAL)); 501 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 502 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 503 return (SET_ERROR(EINVAL)); 504 } 505 506 /* 507 * The first allocated vdev must be of type 'root'. 508 */ 509 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 510 return (SET_ERROR(EINVAL)); 511 512 /* 513 * Determine whether we're a log vdev. 514 */ 515 islog = 0; 516 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 517 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 518 return (SET_ERROR(ENOTSUP)); 519 520 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 521 return (SET_ERROR(ENOTSUP)); 522 523 /* 524 * Set the nparity property for RAID-Z vdevs. 525 */ 526 nparity = -1ULL; 527 if (ops == &vdev_raidz_ops) { 528 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 529 &nparity) == 0) { 530 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 531 return (SET_ERROR(EINVAL)); 532 /* 533 * Previous versions could only support 1 or 2 parity 534 * device. 535 */ 536 if (nparity > 1 && 537 spa_version(spa) < SPA_VERSION_RAIDZ2) 538 return (SET_ERROR(ENOTSUP)); 539 if (nparity > 2 && 540 spa_version(spa) < SPA_VERSION_RAIDZ3) 541 return (SET_ERROR(ENOTSUP)); 542 } else { 543 /* 544 * We require the parity to be specified for SPAs that 545 * support multiple parity levels. 546 */ 547 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 548 return (SET_ERROR(EINVAL)); 549 /* 550 * Otherwise, we default to 1 parity device for RAID-Z. 551 */ 552 nparity = 1; 553 } 554 } else { 555 nparity = 0; 556 } 557 ASSERT(nparity != -1ULL); 558 559 vd = vdev_alloc_common(spa, id, guid, ops); 560 561 vd->vdev_islog = islog; 562 vd->vdev_nparity = nparity; 563 564 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 565 vd->vdev_path = spa_strdup(vd->vdev_path); 566 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 567 vd->vdev_devid = spa_strdup(vd->vdev_devid); 568 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 569 &vd->vdev_physpath) == 0) 570 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 571 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 572 vd->vdev_fru = spa_strdup(vd->vdev_fru); 573 574 /* 575 * Set the whole_disk property. If it's not specified, leave the value 576 * as -1. 577 */ 578 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 579 &vd->vdev_wholedisk) != 0) 580 vd->vdev_wholedisk = -1ULL; 581 582 /* 583 * Look for the 'not present' flag. This will only be set if the device 584 * was not present at the time of import. 585 */ 586 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 587 &vd->vdev_not_present); 588 589 /* 590 * Get the alignment requirement. 591 */ 592 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 593 594 /* 595 * Retrieve the vdev creation time. 596 */ 597 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 598 &vd->vdev_crtxg); 599 600 /* 601 * If we're a top-level vdev, try to load the allocation parameters. 602 */ 603 if (parent && !parent->vdev_parent && 604 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 605 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 606 &vd->vdev_ms_array); 607 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 608 &vd->vdev_ms_shift); 609 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 610 &vd->vdev_asize); 611 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 612 &vd->vdev_removing); 613 } 614 615 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 616 ASSERT(alloctype == VDEV_ALLOC_LOAD || 617 alloctype == VDEV_ALLOC_ADD || 618 alloctype == VDEV_ALLOC_SPLIT || 619 alloctype == VDEV_ALLOC_ROOTPOOL); 620 vd->vdev_mg = metaslab_group_create(islog ? 621 spa_log_class(spa) : spa_normal_class(spa), vd); 622 } 623 624 /* 625 * If we're a leaf vdev, try to load the DTL object and other state. 626 */ 627 if (vd->vdev_ops->vdev_op_leaf && 628 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 629 alloctype == VDEV_ALLOC_ROOTPOOL)) { 630 if (alloctype == VDEV_ALLOC_LOAD) { 631 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 632 &vd->vdev_dtl_object); 633 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 634 &vd->vdev_unspare); 635 } 636 637 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 638 uint64_t spare = 0; 639 640 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 641 &spare) == 0 && spare) 642 spa_spare_add(vd); 643 } 644 645 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 646 &vd->vdev_offline); 647 648 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 649 &vd->vdev_resilver_txg); 650 651 /* 652 * When importing a pool, we want to ignore the persistent fault 653 * state, as the diagnosis made on another system may not be 654 * valid in the current context. Local vdevs will 655 * remain in the faulted state. 656 */ 657 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 658 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 659 &vd->vdev_faulted); 660 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 661 &vd->vdev_degraded); 662 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 663 &vd->vdev_removed); 664 665 if (vd->vdev_faulted || vd->vdev_degraded) { 666 char *aux; 667 668 vd->vdev_label_aux = 669 VDEV_AUX_ERR_EXCEEDED; 670 if (nvlist_lookup_string(nv, 671 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 672 strcmp(aux, "external") == 0) 673 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 674 } 675 } 676 } 677 678 /* 679 * Add ourselves to the parent's list of children. 680 */ 681 vdev_add_child(parent, vd); 682 683 *vdp = vd; 684 685 return (0); 686} 687 688void 689vdev_free(vdev_t *vd) 690{ 691 spa_t *spa = vd->vdev_spa; 692 693 /* 694 * vdev_free() implies closing the vdev first. This is simpler than 695 * trying to ensure complicated semantics for all callers. 696 */ 697 vdev_close(vd); 698 699 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 700 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 701 702 /* 703 * Free all children. 704 */ 705 for (int c = 0; c < vd->vdev_children; c++) 706 vdev_free(vd->vdev_child[c]); 707 708 ASSERT(vd->vdev_child == NULL); 709 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 710 711 /* 712 * Discard allocation state. 713 */ 714 if (vd->vdev_mg != NULL) { 715 vdev_metaslab_fini(vd); 716 metaslab_group_destroy(vd->vdev_mg); 717 } 718 719 ASSERT0(vd->vdev_stat.vs_space); 720 ASSERT0(vd->vdev_stat.vs_dspace); 721 ASSERT0(vd->vdev_stat.vs_alloc); 722 723 /* 724 * Remove this vdev from its parent's child list. 725 */ 726 vdev_remove_child(vd->vdev_parent, vd); 727 728 ASSERT(vd->vdev_parent == NULL); 729 730 /* 731 * Clean up vdev structure. 732 */ 733 vdev_queue_fini(vd); 734 vdev_cache_fini(vd); 735 736 if (vd->vdev_path) 737 spa_strfree(vd->vdev_path); 738 if (vd->vdev_devid) 739 spa_strfree(vd->vdev_devid); 740 if (vd->vdev_physpath) 741 spa_strfree(vd->vdev_physpath); 742 if (vd->vdev_fru) 743 spa_strfree(vd->vdev_fru); 744 745 if (vd->vdev_isspare) 746 spa_spare_remove(vd); 747 if (vd->vdev_isl2cache) 748 spa_l2cache_remove(vd); 749 750 txg_list_destroy(&vd->vdev_ms_list); 751 txg_list_destroy(&vd->vdev_dtl_list); 752 753 mutex_enter(&vd->vdev_dtl_lock); 754 space_map_close(vd->vdev_dtl_sm); 755 for (int t = 0; t < DTL_TYPES; t++) { 756 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 757 range_tree_destroy(vd->vdev_dtl[t]); 758 } 759 mutex_exit(&vd->vdev_dtl_lock); 760 761 mutex_destroy(&vd->vdev_queue_lock); 762 mutex_destroy(&vd->vdev_dtl_lock); 763 mutex_destroy(&vd->vdev_stat_lock); 764 mutex_destroy(&vd->vdev_probe_lock); 765 766 if (vd == spa->spa_root_vdev) 767 spa->spa_root_vdev = NULL; 768 769 kmem_free(vd, sizeof (vdev_t)); 770} 771 772/* 773 * Transfer top-level vdev state from svd to tvd. 774 */ 775static void 776vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 777{ 778 spa_t *spa = svd->vdev_spa; 779 metaslab_t *msp; 780 vdev_t *vd; 781 int t; 782 783 ASSERT(tvd == tvd->vdev_top); 784 785 tvd->vdev_ms_array = svd->vdev_ms_array; 786 tvd->vdev_ms_shift = svd->vdev_ms_shift; 787 tvd->vdev_ms_count = svd->vdev_ms_count; 788 789 svd->vdev_ms_array = 0; 790 svd->vdev_ms_shift = 0; 791 svd->vdev_ms_count = 0; 792 793 if (tvd->vdev_mg) 794 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 795 tvd->vdev_mg = svd->vdev_mg; 796 tvd->vdev_ms = svd->vdev_ms; 797 798 svd->vdev_mg = NULL; 799 svd->vdev_ms = NULL; 800 801 if (tvd->vdev_mg != NULL) 802 tvd->vdev_mg->mg_vd = tvd; 803 804 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 805 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 806 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 807 808 svd->vdev_stat.vs_alloc = 0; 809 svd->vdev_stat.vs_space = 0; 810 svd->vdev_stat.vs_dspace = 0; 811 812 for (t = 0; t < TXG_SIZE; t++) { 813 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 814 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 815 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 816 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 817 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 818 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 819 } 820 821 if (list_link_active(&svd->vdev_config_dirty_node)) { 822 vdev_config_clean(svd); 823 vdev_config_dirty(tvd); 824 } 825 826 if (list_link_active(&svd->vdev_state_dirty_node)) { 827 vdev_state_clean(svd); 828 vdev_state_dirty(tvd); 829 } 830 831 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 832 svd->vdev_deflate_ratio = 0; 833 834 tvd->vdev_islog = svd->vdev_islog; 835 svd->vdev_islog = 0; 836} 837 838static void 839vdev_top_update(vdev_t *tvd, vdev_t *vd) 840{ 841 if (vd == NULL) 842 return; 843 844 vd->vdev_top = tvd; 845 846 for (int c = 0; c < vd->vdev_children; c++) 847 vdev_top_update(tvd, vd->vdev_child[c]); 848} 849 850/* 851 * Add a mirror/replacing vdev above an existing vdev. 852 */ 853vdev_t * 854vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 855{ 856 spa_t *spa = cvd->vdev_spa; 857 vdev_t *pvd = cvd->vdev_parent; 858 vdev_t *mvd; 859 860 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 861 862 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 863 864 mvd->vdev_asize = cvd->vdev_asize; 865 mvd->vdev_min_asize = cvd->vdev_min_asize; 866 mvd->vdev_max_asize = cvd->vdev_max_asize; 867 mvd->vdev_ashift = cvd->vdev_ashift; 868 mvd->vdev_logical_ashift = cvd->vdev_logical_ashift; 869 mvd->vdev_physical_ashift = cvd->vdev_physical_ashift; 870 mvd->vdev_state = cvd->vdev_state; 871 mvd->vdev_crtxg = cvd->vdev_crtxg; 872 873 vdev_remove_child(pvd, cvd); 874 vdev_add_child(pvd, mvd); 875 cvd->vdev_id = mvd->vdev_children; 876 vdev_add_child(mvd, cvd); 877 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 878 879 if (mvd == mvd->vdev_top) 880 vdev_top_transfer(cvd, mvd); 881 882 return (mvd); 883} 884 885/* 886 * Remove a 1-way mirror/replacing vdev from the tree. 887 */ 888void 889vdev_remove_parent(vdev_t *cvd) 890{ 891 vdev_t *mvd = cvd->vdev_parent; 892 vdev_t *pvd = mvd->vdev_parent; 893 894 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 895 896 ASSERT(mvd->vdev_children == 1); 897 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 898 mvd->vdev_ops == &vdev_replacing_ops || 899 mvd->vdev_ops == &vdev_spare_ops); 900 cvd->vdev_ashift = mvd->vdev_ashift; 901 cvd->vdev_logical_ashift = mvd->vdev_logical_ashift; 902 cvd->vdev_physical_ashift = mvd->vdev_physical_ashift; 903 904 vdev_remove_child(mvd, cvd); 905 vdev_remove_child(pvd, mvd); 906 907 /* 908 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 909 * Otherwise, we could have detached an offline device, and when we 910 * go to import the pool we'll think we have two top-level vdevs, 911 * instead of a different version of the same top-level vdev. 912 */ 913 if (mvd->vdev_top == mvd) { 914 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 915 cvd->vdev_orig_guid = cvd->vdev_guid; 916 cvd->vdev_guid += guid_delta; 917 cvd->vdev_guid_sum += guid_delta; 918 } 919 cvd->vdev_id = mvd->vdev_id; 920 vdev_add_child(pvd, cvd); 921 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 922 923 if (cvd == cvd->vdev_top) 924 vdev_top_transfer(mvd, cvd); 925 926 ASSERT(mvd->vdev_children == 0); 927 vdev_free(mvd); 928} 929 930int 931vdev_metaslab_init(vdev_t *vd, uint64_t txg) 932{ 933 spa_t *spa = vd->vdev_spa; 934 objset_t *mos = spa->spa_meta_objset; 935 uint64_t m; 936 uint64_t oldc = vd->vdev_ms_count; 937 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 938 metaslab_t **mspp; 939 int error; 940 941 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 942 943 /* 944 * This vdev is not being allocated from yet or is a hole. 945 */ 946 if (vd->vdev_ms_shift == 0) 947 return (0); 948 949 ASSERT(!vd->vdev_ishole); 950 951 /* 952 * Compute the raidz-deflation ratio. Note, we hard-code 953 * in 128k (1 << 17) because it is the "typical" blocksize. 954 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change, 955 * otherwise it would inconsistently account for existing bp's. 956 */ 957 vd->vdev_deflate_ratio = (1 << 17) / 958 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 959 960 ASSERT(oldc <= newc); 961 962 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 963 964 if (oldc != 0) { 965 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 966 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 967 } 968 969 vd->vdev_ms = mspp; 970 vd->vdev_ms_count = newc; 971 972 for (m = oldc; m < newc; m++) { 973 uint64_t object = 0; 974 975 if (txg == 0) { 976 error = dmu_read(mos, vd->vdev_ms_array, 977 m * sizeof (uint64_t), sizeof (uint64_t), &object, 978 DMU_READ_PREFETCH); 979 if (error) 980 return (error); 981 } 982 983 error = metaslab_init(vd->vdev_mg, m, object, txg, 984 &(vd->vdev_ms[m])); 985 if (error) 986 return (error); 987 } 988 989 if (txg == 0) 990 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 991 992 /* 993 * If the vdev is being removed we don't activate 994 * the metaslabs since we want to ensure that no new 995 * allocations are performed on this device. 996 */ 997 if (oldc == 0 && !vd->vdev_removing) 998 metaslab_group_activate(vd->vdev_mg); 999 1000 if (txg == 0) 1001 spa_config_exit(spa, SCL_ALLOC, FTAG); 1002 1003 return (0); 1004} 1005 1006void 1007vdev_metaslab_fini(vdev_t *vd) 1008{ 1009 uint64_t m; 1010 uint64_t count = vd->vdev_ms_count; 1011 1012 if (vd->vdev_ms != NULL) { 1013 metaslab_group_passivate(vd->vdev_mg); 1014 for (m = 0; m < count; m++) { 1015 metaslab_t *msp = vd->vdev_ms[m]; 1016 1017 if (msp != NULL) 1018 metaslab_fini(msp); 1019 } 1020 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 1021 vd->vdev_ms = NULL; 1022 } 1023} 1024 1025typedef struct vdev_probe_stats { 1026 boolean_t vps_readable; 1027 boolean_t vps_writeable; 1028 int vps_flags; 1029} vdev_probe_stats_t; 1030 1031static void 1032vdev_probe_done(zio_t *zio) 1033{ 1034 spa_t *spa = zio->io_spa; 1035 vdev_t *vd = zio->io_vd; 1036 vdev_probe_stats_t *vps = zio->io_private; 1037 1038 ASSERT(vd->vdev_probe_zio != NULL); 1039 1040 if (zio->io_type == ZIO_TYPE_READ) { 1041 if (zio->io_error == 0) 1042 vps->vps_readable = 1; 1043 if (zio->io_error == 0 && spa_writeable(spa)) { 1044 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1045 zio->io_offset, zio->io_size, zio->io_data, 1046 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1047 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1048 } else { 1049 zio_buf_free(zio->io_data, zio->io_size); 1050 } 1051 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1052 if (zio->io_error == 0) 1053 vps->vps_writeable = 1; 1054 zio_buf_free(zio->io_data, zio->io_size); 1055 } else if (zio->io_type == ZIO_TYPE_NULL) { 1056 zio_t *pio; 1057 1058 vd->vdev_cant_read |= !vps->vps_readable; 1059 vd->vdev_cant_write |= !vps->vps_writeable; 1060 1061 if (vdev_readable(vd) && 1062 (vdev_writeable(vd) || !spa_writeable(spa))) { 1063 zio->io_error = 0; 1064 } else { 1065 ASSERT(zio->io_error != 0); 1066 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1067 spa, vd, NULL, 0, 0); 1068 zio->io_error = SET_ERROR(ENXIO); 1069 } 1070 1071 mutex_enter(&vd->vdev_probe_lock); 1072 ASSERT(vd->vdev_probe_zio == zio); 1073 vd->vdev_probe_zio = NULL; 1074 mutex_exit(&vd->vdev_probe_lock); 1075 1076 zio_link_t *zl = NULL; 1077 while ((pio = zio_walk_parents(zio, &zl)) != NULL) 1078 if (!vdev_accessible(vd, pio)) 1079 pio->io_error = SET_ERROR(ENXIO); 1080 1081 kmem_free(vps, sizeof (*vps)); 1082 } 1083} 1084 1085/* 1086 * Determine whether this device is accessible. 1087 * 1088 * Read and write to several known locations: the pad regions of each 1089 * vdev label but the first, which we leave alone in case it contains 1090 * a VTOC. 1091 */ 1092zio_t * 1093vdev_probe(vdev_t *vd, zio_t *zio) 1094{ 1095 spa_t *spa = vd->vdev_spa; 1096 vdev_probe_stats_t *vps = NULL; 1097 zio_t *pio; 1098 1099 ASSERT(vd->vdev_ops->vdev_op_leaf); 1100 1101 /* 1102 * Don't probe the probe. 1103 */ 1104 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1105 return (NULL); 1106 1107 /* 1108 * To prevent 'probe storms' when a device fails, we create 1109 * just one probe i/o at a time. All zios that want to probe 1110 * this vdev will become parents of the probe io. 1111 */ 1112 mutex_enter(&vd->vdev_probe_lock); 1113 1114 if ((pio = vd->vdev_probe_zio) == NULL) { 1115 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1116 1117 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1118 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1119 ZIO_FLAG_TRYHARD; 1120 1121 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1122 /* 1123 * vdev_cant_read and vdev_cant_write can only 1124 * transition from TRUE to FALSE when we have the 1125 * SCL_ZIO lock as writer; otherwise they can only 1126 * transition from FALSE to TRUE. This ensures that 1127 * any zio looking at these values can assume that 1128 * failures persist for the life of the I/O. That's 1129 * important because when a device has intermittent 1130 * connectivity problems, we want to ensure that 1131 * they're ascribed to the device (ENXIO) and not 1132 * the zio (EIO). 1133 * 1134 * Since we hold SCL_ZIO as writer here, clear both 1135 * values so the probe can reevaluate from first 1136 * principles. 1137 */ 1138 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1139 vd->vdev_cant_read = B_FALSE; 1140 vd->vdev_cant_write = B_FALSE; 1141 } 1142 1143 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1144 vdev_probe_done, vps, 1145 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1146 1147 /* 1148 * We can't change the vdev state in this context, so we 1149 * kick off an async task to do it on our behalf. 1150 */ 1151 if (zio != NULL) { 1152 vd->vdev_probe_wanted = B_TRUE; 1153 spa_async_request(spa, SPA_ASYNC_PROBE); 1154 } 1155 } 1156 1157 if (zio != NULL) 1158 zio_add_child(zio, pio); 1159 1160 mutex_exit(&vd->vdev_probe_lock); 1161 1162 if (vps == NULL) { 1163 ASSERT(zio != NULL); 1164 return (NULL); 1165 } 1166 1167 for (int l = 1; l < VDEV_LABELS; l++) { 1168 zio_nowait(zio_read_phys(pio, vd, 1169 vdev_label_offset(vd->vdev_psize, l, 1170 offsetof(vdev_label_t, vl_pad2)), 1171 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1172 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1173 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1174 } 1175 1176 if (zio == NULL) 1177 return (pio); 1178 1179 zio_nowait(pio); 1180 return (NULL); 1181} 1182 1183static void 1184vdev_open_child(void *arg) 1185{ 1186 vdev_t *vd = arg; 1187 1188 vd->vdev_open_thread = curthread; 1189 vd->vdev_open_error = vdev_open(vd); 1190 vd->vdev_open_thread = NULL; 1191} 1192 1193boolean_t 1194vdev_uses_zvols(vdev_t *vd) 1195{ 1196 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1197 strlen(ZVOL_DIR)) == 0) 1198 return (B_TRUE); 1199 for (int c = 0; c < vd->vdev_children; c++) 1200 if (vdev_uses_zvols(vd->vdev_child[c])) 1201 return (B_TRUE); 1202 return (B_FALSE); 1203} 1204 1205void 1206vdev_open_children(vdev_t *vd) 1207{ 1208 taskq_t *tq; 1209 int children = vd->vdev_children; 1210 1211 /* 1212 * in order to handle pools on top of zvols, do the opens 1213 * in a single thread so that the same thread holds the 1214 * spa_namespace_lock 1215 */ 1216 if (B_TRUE || vdev_uses_zvols(vd)) { 1217 for (int c = 0; c < children; c++) 1218 vd->vdev_child[c]->vdev_open_error = 1219 vdev_open(vd->vdev_child[c]); 1220 return; 1221 } 1222 tq = taskq_create("vdev_open", children, minclsyspri, 1223 children, children, TASKQ_PREPOPULATE); 1224 1225 for (int c = 0; c < children; c++) 1226 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1227 TQ_SLEEP) != 0); 1228 1229 taskq_destroy(tq); 1230} 1231 1232/* 1233 * Prepare a virtual device for access. 1234 */ 1235int 1236vdev_open(vdev_t *vd) 1237{ 1238 spa_t *spa = vd->vdev_spa; 1239 int error; 1240 uint64_t osize = 0; 1241 uint64_t max_osize = 0; 1242 uint64_t asize, max_asize, psize; 1243 uint64_t logical_ashift = 0; 1244 uint64_t physical_ashift = 0; 1245 1246 ASSERT(vd->vdev_open_thread == curthread || 1247 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1248 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1249 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1250 vd->vdev_state == VDEV_STATE_OFFLINE); 1251 1252 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1253 vd->vdev_cant_read = B_FALSE; 1254 vd->vdev_cant_write = B_FALSE; 1255 vd->vdev_notrim = B_FALSE; 1256 vd->vdev_min_asize = vdev_get_min_asize(vd); 1257 1258 /* 1259 * If this vdev is not removed, check its fault status. If it's 1260 * faulted, bail out of the open. 1261 */ 1262 if (!vd->vdev_removed && vd->vdev_faulted) { 1263 ASSERT(vd->vdev_children == 0); 1264 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1265 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1266 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1267 vd->vdev_label_aux); 1268 return (SET_ERROR(ENXIO)); 1269 } else if (vd->vdev_offline) { 1270 ASSERT(vd->vdev_children == 0); 1271 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1272 return (SET_ERROR(ENXIO)); 1273 } 1274 1275 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, 1276 &logical_ashift, &physical_ashift); 1277 1278 /* 1279 * Reset the vdev_reopening flag so that we actually close 1280 * the vdev on error. 1281 */ 1282 vd->vdev_reopening = B_FALSE; 1283 if (zio_injection_enabled && error == 0) 1284 error = zio_handle_device_injection(vd, NULL, ENXIO); 1285 1286 if (error) { 1287 if (vd->vdev_removed && 1288 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1289 vd->vdev_removed = B_FALSE; 1290 1291 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1292 vd->vdev_stat.vs_aux); 1293 return (error); 1294 } 1295 1296 vd->vdev_removed = B_FALSE; 1297 1298 /* 1299 * Recheck the faulted flag now that we have confirmed that 1300 * the vdev is accessible. If we're faulted, bail. 1301 */ 1302 if (vd->vdev_faulted) { 1303 ASSERT(vd->vdev_children == 0); 1304 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1305 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1306 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1307 vd->vdev_label_aux); 1308 return (SET_ERROR(ENXIO)); 1309 } 1310 1311 if (vd->vdev_degraded) { 1312 ASSERT(vd->vdev_children == 0); 1313 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1314 VDEV_AUX_ERR_EXCEEDED); 1315 } else { 1316 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1317 } 1318 1319 /* 1320 * For hole or missing vdevs we just return success. 1321 */ 1322 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1323 return (0); 1324 1325 if (zfs_trim_enabled && !vd->vdev_notrim && vd->vdev_ops->vdev_op_leaf) 1326 trim_map_create(vd); 1327 1328 for (int c = 0; c < vd->vdev_children; c++) { 1329 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1330 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1331 VDEV_AUX_NONE); 1332 break; 1333 } 1334 } 1335 1336 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1337 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1338 1339 if (vd->vdev_children == 0) { 1340 if (osize < SPA_MINDEVSIZE) { 1341 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1342 VDEV_AUX_TOO_SMALL); 1343 return (SET_ERROR(EOVERFLOW)); 1344 } 1345 psize = osize; 1346 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1347 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1348 VDEV_LABEL_END_SIZE); 1349 } else { 1350 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1351 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1352 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1353 VDEV_AUX_TOO_SMALL); 1354 return (SET_ERROR(EOVERFLOW)); 1355 } 1356 psize = 0; 1357 asize = osize; 1358 max_asize = max_osize; 1359 } 1360 1361 vd->vdev_psize = psize; 1362 1363 /* 1364 * Make sure the allocatable size hasn't shrunk. 1365 */ 1366 if (asize < vd->vdev_min_asize) { 1367 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1368 VDEV_AUX_BAD_LABEL); 1369 return (SET_ERROR(EINVAL)); 1370 } 1371 1372 vd->vdev_physical_ashift = 1373 MAX(physical_ashift, vd->vdev_physical_ashift); 1374 vd->vdev_logical_ashift = MAX(logical_ashift, vd->vdev_logical_ashift); 1375 vd->vdev_ashift = MAX(vd->vdev_logical_ashift, vd->vdev_ashift); 1376 1377 if (vd->vdev_logical_ashift > SPA_MAXASHIFT) { 1378 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1379 VDEV_AUX_ASHIFT_TOO_BIG); 1380 return (EINVAL); 1381 } 1382 1383 if (vd->vdev_asize == 0) { 1384 /* 1385 * This is the first-ever open, so use the computed values. 1386 * For testing purposes, a higher ashift can be requested. 1387 */ 1388 vd->vdev_asize = asize; 1389 vd->vdev_max_asize = max_asize; 1390 } else { 1391 /* 1392 * Make sure the alignment requirement hasn't increased. 1393 */ 1394 if (vd->vdev_ashift > vd->vdev_top->vdev_ashift && 1395 vd->vdev_ops->vdev_op_leaf) { 1396 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1397 VDEV_AUX_BAD_LABEL); 1398 return (EINVAL); 1399 } 1400 vd->vdev_max_asize = max_asize; 1401 } 1402 1403 /* 1404 * If all children are healthy and the asize has increased, 1405 * then we've experienced dynamic LUN growth. If automatic 1406 * expansion is enabled then use the additional space. 1407 */ 1408 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1409 (vd->vdev_expanding || spa->spa_autoexpand)) 1410 vd->vdev_asize = asize; 1411 1412 vdev_set_min_asize(vd); 1413 1414 /* 1415 * Ensure we can issue some IO before declaring the 1416 * vdev open for business. 1417 */ 1418 if (vd->vdev_ops->vdev_op_leaf && 1419 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1420 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1421 VDEV_AUX_ERR_EXCEEDED); 1422 return (error); 1423 } 1424 1425 /* 1426 * Track the min and max ashift values for normal data devices. 1427 */ 1428 if (vd->vdev_top == vd && vd->vdev_ashift != 0 && 1429 !vd->vdev_islog && vd->vdev_aux == NULL) { 1430 if (vd->vdev_ashift > spa->spa_max_ashift) 1431 spa->spa_max_ashift = vd->vdev_ashift; 1432 if (vd->vdev_ashift < spa->spa_min_ashift) 1433 spa->spa_min_ashift = vd->vdev_ashift; 1434 } 1435 1436 /* 1437 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1438 * resilver. But don't do this if we are doing a reopen for a scrub, 1439 * since this would just restart the scrub we are already doing. 1440 */ 1441 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1442 vdev_resilver_needed(vd, NULL, NULL)) 1443 spa_async_request(spa, SPA_ASYNC_RESILVER); 1444 1445 return (0); 1446} 1447 1448/* 1449 * Called once the vdevs are all opened, this routine validates the label 1450 * contents. This needs to be done before vdev_load() so that we don't 1451 * inadvertently do repair I/Os to the wrong device. 1452 * 1453 * If 'strict' is false ignore the spa guid check. This is necessary because 1454 * if the machine crashed during a re-guid the new guid might have been written 1455 * to all of the vdev labels, but not the cached config. The strict check 1456 * will be performed when the pool is opened again using the mos config. 1457 * 1458 * This function will only return failure if one of the vdevs indicates that it 1459 * has since been destroyed or exported. This is only possible if 1460 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1461 * will be updated but the function will return 0. 1462 */ 1463int 1464vdev_validate(vdev_t *vd, boolean_t strict) 1465{ 1466 spa_t *spa = vd->vdev_spa; 1467 nvlist_t *label; 1468 uint64_t guid = 0, top_guid; 1469 uint64_t state; 1470 1471 for (int c = 0; c < vd->vdev_children; c++) 1472 if (vdev_validate(vd->vdev_child[c], strict) != 0) 1473 return (SET_ERROR(EBADF)); 1474 1475 /* 1476 * If the device has already failed, or was marked offline, don't do 1477 * any further validation. Otherwise, label I/O will fail and we will 1478 * overwrite the previous state. 1479 */ 1480 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1481 uint64_t aux_guid = 0; 1482 nvlist_t *nvl; 1483 uint64_t txg = spa_last_synced_txg(spa) != 0 ? 1484 spa_last_synced_txg(spa) : -1ULL; 1485 1486 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1487 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1488 VDEV_AUX_BAD_LABEL); 1489 return (0); 1490 } 1491 1492 /* 1493 * Determine if this vdev has been split off into another 1494 * pool. If so, then refuse to open it. 1495 */ 1496 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1497 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1498 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1499 VDEV_AUX_SPLIT_POOL); 1500 nvlist_free(label); 1501 return (0); 1502 } 1503 1504 if (strict && (nvlist_lookup_uint64(label, 1505 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 || 1506 guid != spa_guid(spa))) { 1507 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1508 VDEV_AUX_CORRUPT_DATA); 1509 nvlist_free(label); 1510 return (0); 1511 } 1512 1513 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1514 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1515 &aux_guid) != 0) 1516 aux_guid = 0; 1517 1518 /* 1519 * If this vdev just became a top-level vdev because its 1520 * sibling was detached, it will have adopted the parent's 1521 * vdev guid -- but the label may or may not be on disk yet. 1522 * Fortunately, either version of the label will have the 1523 * same top guid, so if we're a top-level vdev, we can 1524 * safely compare to that instead. 1525 * 1526 * If we split this vdev off instead, then we also check the 1527 * original pool's guid. We don't want to consider the vdev 1528 * corrupt if it is partway through a split operation. 1529 */ 1530 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1531 &guid) != 0 || 1532 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1533 &top_guid) != 0 || 1534 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1535 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1536 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1537 VDEV_AUX_CORRUPT_DATA); 1538 nvlist_free(label); 1539 return (0); 1540 } 1541 1542 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1543 &state) != 0) { 1544 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1545 VDEV_AUX_CORRUPT_DATA); 1546 nvlist_free(label); 1547 return (0); 1548 } 1549 1550 nvlist_free(label); 1551 1552 /* 1553 * If this is a verbatim import, no need to check the 1554 * state of the pool. 1555 */ 1556 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1557 spa_load_state(spa) == SPA_LOAD_OPEN && 1558 state != POOL_STATE_ACTIVE) 1559 return (SET_ERROR(EBADF)); 1560 1561 /* 1562 * If we were able to open and validate a vdev that was 1563 * previously marked permanently unavailable, clear that state 1564 * now. 1565 */ 1566 if (vd->vdev_not_present) 1567 vd->vdev_not_present = 0; 1568 } 1569 1570 return (0); 1571} 1572 1573/* 1574 * Close a virtual device. 1575 */ 1576void 1577vdev_close(vdev_t *vd) 1578{ 1579 spa_t *spa = vd->vdev_spa; 1580 vdev_t *pvd = vd->vdev_parent; 1581 1582 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1583 1584 /* 1585 * If our parent is reopening, then we are as well, unless we are 1586 * going offline. 1587 */ 1588 if (pvd != NULL && pvd->vdev_reopening) 1589 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1590 1591 vd->vdev_ops->vdev_op_close(vd); 1592 1593 vdev_cache_purge(vd); 1594 1595 if (vd->vdev_ops->vdev_op_leaf) 1596 trim_map_destroy(vd); 1597 1598 /* 1599 * We record the previous state before we close it, so that if we are 1600 * doing a reopen(), we don't generate FMA ereports if we notice that 1601 * it's still faulted. 1602 */ 1603 vd->vdev_prevstate = vd->vdev_state; 1604 1605 if (vd->vdev_offline) 1606 vd->vdev_state = VDEV_STATE_OFFLINE; 1607 else 1608 vd->vdev_state = VDEV_STATE_CLOSED; 1609 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1610} 1611 1612void 1613vdev_hold(vdev_t *vd) 1614{ 1615 spa_t *spa = vd->vdev_spa; 1616 1617 ASSERT(spa_is_root(spa)); 1618 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1619 return; 1620 1621 for (int c = 0; c < vd->vdev_children; c++) 1622 vdev_hold(vd->vdev_child[c]); 1623 1624 if (vd->vdev_ops->vdev_op_leaf) 1625 vd->vdev_ops->vdev_op_hold(vd); 1626} 1627 1628void 1629vdev_rele(vdev_t *vd) 1630{ 1631 spa_t *spa = vd->vdev_spa; 1632 1633 ASSERT(spa_is_root(spa)); 1634 for (int c = 0; c < vd->vdev_children; c++) 1635 vdev_rele(vd->vdev_child[c]); 1636 1637 if (vd->vdev_ops->vdev_op_leaf) 1638 vd->vdev_ops->vdev_op_rele(vd); 1639} 1640 1641/* 1642 * Reopen all interior vdevs and any unopened leaves. We don't actually 1643 * reopen leaf vdevs which had previously been opened as they might deadlock 1644 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1645 * If the leaf has never been opened then open it, as usual. 1646 */ 1647void 1648vdev_reopen(vdev_t *vd) 1649{ 1650 spa_t *spa = vd->vdev_spa; 1651 1652 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1653 1654 /* set the reopening flag unless we're taking the vdev offline */ 1655 vd->vdev_reopening = !vd->vdev_offline; 1656 vdev_close(vd); 1657 (void) vdev_open(vd); 1658 1659 /* 1660 * Call vdev_validate() here to make sure we have the same device. 1661 * Otherwise, a device with an invalid label could be successfully 1662 * opened in response to vdev_reopen(). 1663 */ 1664 if (vd->vdev_aux) { 1665 (void) vdev_validate_aux(vd); 1666 if (vdev_readable(vd) && vdev_writeable(vd) && 1667 vd->vdev_aux == &spa->spa_l2cache && 1668 !l2arc_vdev_present(vd)) 1669 l2arc_add_vdev(spa, vd); 1670 } else { 1671 (void) vdev_validate(vd, B_TRUE); 1672 } 1673 1674 /* 1675 * Reassess parent vdev's health. 1676 */ 1677 vdev_propagate_state(vd); 1678} 1679 1680int 1681vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1682{ 1683 int error; 1684 1685 /* 1686 * Normally, partial opens (e.g. of a mirror) are allowed. 1687 * For a create, however, we want to fail the request if 1688 * there are any components we can't open. 1689 */ 1690 error = vdev_open(vd); 1691 1692 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1693 vdev_close(vd); 1694 return (error ? error : ENXIO); 1695 } 1696 1697 /* 1698 * Recursively load DTLs and initialize all labels. 1699 */ 1700 if ((error = vdev_dtl_load(vd)) != 0 || 1701 (error = vdev_label_init(vd, txg, isreplacing ? 1702 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1703 vdev_close(vd); 1704 return (error); 1705 } 1706 1707 return (0); 1708} 1709 1710void 1711vdev_metaslab_set_size(vdev_t *vd) 1712{ 1713 /* 1714 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev. 1715 */ 1716 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev); 1717 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1718} 1719 1720/* 1721 * Maximize performance by inflating the configured ashift for top level 1722 * vdevs to be as close to the physical ashift as possible while maintaining 1723 * administrator defined limits and ensuring it doesn't go below the 1724 * logical ashift. 1725 */ 1726void 1727vdev_ashift_optimize(vdev_t *vd) 1728{ 1729 if (vd == vd->vdev_top) { 1730 if (vd->vdev_ashift < vd->vdev_physical_ashift) { 1731 vd->vdev_ashift = MIN( 1732 MAX(zfs_max_auto_ashift, vd->vdev_ashift), 1733 MAX(zfs_min_auto_ashift, vd->vdev_physical_ashift)); 1734 } else { 1735 /* 1736 * Unusual case where logical ashift > physical ashift 1737 * so we can't cap the calculated ashift based on max 1738 * ashift as that would cause failures. 1739 * We still check if we need to increase it to match 1740 * the min ashift. 1741 */ 1742 vd->vdev_ashift = MAX(zfs_min_auto_ashift, 1743 vd->vdev_ashift); 1744 } 1745 } 1746} 1747 1748void 1749vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1750{ 1751 ASSERT(vd == vd->vdev_top); 1752 ASSERT(!vd->vdev_ishole); 1753 ASSERT(ISP2(flags)); 1754 ASSERT(spa_writeable(vd->vdev_spa)); 1755 1756 if (flags & VDD_METASLAB) 1757 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1758 1759 if (flags & VDD_DTL) 1760 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1761 1762 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1763} 1764 1765void 1766vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 1767{ 1768 for (int c = 0; c < vd->vdev_children; c++) 1769 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 1770 1771 if (vd->vdev_ops->vdev_op_leaf) 1772 vdev_dirty(vd->vdev_top, flags, vd, txg); 1773} 1774 1775/* 1776 * DTLs. 1777 * 1778 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1779 * the vdev has less than perfect replication. There are four kinds of DTL: 1780 * 1781 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1782 * 1783 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1784 * 1785 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1786 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1787 * txgs that was scrubbed. 1788 * 1789 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1790 * persistent errors or just some device being offline. 1791 * Unlike the other three, the DTL_OUTAGE map is not generally 1792 * maintained; it's only computed when needed, typically to 1793 * determine whether a device can be detached. 1794 * 1795 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1796 * either has the data or it doesn't. 1797 * 1798 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1799 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1800 * if any child is less than fully replicated, then so is its parent. 1801 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1802 * comprising only those txgs which appear in 'maxfaults' or more children; 1803 * those are the txgs we don't have enough replication to read. For example, 1804 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1805 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1806 * two child DTL_MISSING maps. 1807 * 1808 * It should be clear from the above that to compute the DTLs and outage maps 1809 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1810 * Therefore, that is all we keep on disk. When loading the pool, or after 1811 * a configuration change, we generate all other DTLs from first principles. 1812 */ 1813void 1814vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1815{ 1816 range_tree_t *rt = vd->vdev_dtl[t]; 1817 1818 ASSERT(t < DTL_TYPES); 1819 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1820 ASSERT(spa_writeable(vd->vdev_spa)); 1821 1822 mutex_enter(rt->rt_lock); 1823 if (!range_tree_contains(rt, txg, size)) 1824 range_tree_add(rt, txg, size); 1825 mutex_exit(rt->rt_lock); 1826} 1827 1828boolean_t 1829vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1830{ 1831 range_tree_t *rt = vd->vdev_dtl[t]; 1832 boolean_t dirty = B_FALSE; 1833 1834 ASSERT(t < DTL_TYPES); 1835 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1836 1837 mutex_enter(rt->rt_lock); 1838 if (range_tree_space(rt) != 0) 1839 dirty = range_tree_contains(rt, txg, size); 1840 mutex_exit(rt->rt_lock); 1841 1842 return (dirty); 1843} 1844 1845boolean_t 1846vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1847{ 1848 range_tree_t *rt = vd->vdev_dtl[t]; 1849 boolean_t empty; 1850 1851 mutex_enter(rt->rt_lock); 1852 empty = (range_tree_space(rt) == 0); 1853 mutex_exit(rt->rt_lock); 1854 1855 return (empty); 1856} 1857 1858/* 1859 * Returns the lowest txg in the DTL range. 1860 */ 1861static uint64_t 1862vdev_dtl_min(vdev_t *vd) 1863{ 1864 range_seg_t *rs; 1865 1866 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1867 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1868 ASSERT0(vd->vdev_children); 1869 1870 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1871 return (rs->rs_start - 1); 1872} 1873 1874/* 1875 * Returns the highest txg in the DTL. 1876 */ 1877static uint64_t 1878vdev_dtl_max(vdev_t *vd) 1879{ 1880 range_seg_t *rs; 1881 1882 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1883 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1884 ASSERT0(vd->vdev_children); 1885 1886 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1887 return (rs->rs_end); 1888} 1889 1890/* 1891 * Determine if a resilvering vdev should remove any DTL entries from 1892 * its range. If the vdev was resilvering for the entire duration of the 1893 * scan then it should excise that range from its DTLs. Otherwise, this 1894 * vdev is considered partially resilvered and should leave its DTL 1895 * entries intact. The comment in vdev_dtl_reassess() describes how we 1896 * excise the DTLs. 1897 */ 1898static boolean_t 1899vdev_dtl_should_excise(vdev_t *vd) 1900{ 1901 spa_t *spa = vd->vdev_spa; 1902 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1903 1904 ASSERT0(scn->scn_phys.scn_errors); 1905 ASSERT0(vd->vdev_children); 1906 1907 if (vd->vdev_state < VDEV_STATE_DEGRADED) 1908 return (B_FALSE); 1909 1910 if (vd->vdev_resilver_txg == 0 || 1911 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0) 1912 return (B_TRUE); 1913 1914 /* 1915 * When a resilver is initiated the scan will assign the scn_max_txg 1916 * value to the highest txg value that exists in all DTLs. If this 1917 * device's max DTL is not part of this scan (i.e. it is not in 1918 * the range (scn_min_txg, scn_max_txg] then it is not eligible 1919 * for excision. 1920 */ 1921 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 1922 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 1923 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 1924 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 1925 return (B_TRUE); 1926 } 1927 return (B_FALSE); 1928} 1929 1930/* 1931 * Reassess DTLs after a config change or scrub completion. 1932 */ 1933void 1934vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1935{ 1936 spa_t *spa = vd->vdev_spa; 1937 avl_tree_t reftree; 1938 int minref; 1939 1940 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1941 1942 for (int c = 0; c < vd->vdev_children; c++) 1943 vdev_dtl_reassess(vd->vdev_child[c], txg, 1944 scrub_txg, scrub_done); 1945 1946 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1947 return; 1948 1949 if (vd->vdev_ops->vdev_op_leaf) { 1950 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1951 1952 mutex_enter(&vd->vdev_dtl_lock); 1953 1954 /* 1955 * If we've completed a scan cleanly then determine 1956 * if this vdev should remove any DTLs. We only want to 1957 * excise regions on vdevs that were available during 1958 * the entire duration of this scan. 1959 */ 1960 if (scrub_txg != 0 && 1961 (spa->spa_scrub_started || 1962 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 1963 vdev_dtl_should_excise(vd)) { 1964 /* 1965 * We completed a scrub up to scrub_txg. If we 1966 * did it without rebooting, then the scrub dtl 1967 * will be valid, so excise the old region and 1968 * fold in the scrub dtl. Otherwise, leave the 1969 * dtl as-is if there was an error. 1970 * 1971 * There's little trick here: to excise the beginning 1972 * of the DTL_MISSING map, we put it into a reference 1973 * tree and then add a segment with refcnt -1 that 1974 * covers the range [0, scrub_txg). This means 1975 * that each txg in that range has refcnt -1 or 0. 1976 * We then add DTL_SCRUB with a refcnt of 2, so that 1977 * entries in the range [0, scrub_txg) will have a 1978 * positive refcnt -- either 1 or 2. We then convert 1979 * the reference tree into the new DTL_MISSING map. 1980 */ 1981 space_reftree_create(&reftree); 1982 space_reftree_add_map(&reftree, 1983 vd->vdev_dtl[DTL_MISSING], 1); 1984 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 1985 space_reftree_add_map(&reftree, 1986 vd->vdev_dtl[DTL_SCRUB], 2); 1987 space_reftree_generate_map(&reftree, 1988 vd->vdev_dtl[DTL_MISSING], 1); 1989 space_reftree_destroy(&reftree); 1990 } 1991 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1992 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1993 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 1994 if (scrub_done) 1995 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1996 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1997 if (!vdev_readable(vd)) 1998 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1999 else 2000 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 2001 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 2002 2003 /* 2004 * If the vdev was resilvering and no longer has any 2005 * DTLs then reset its resilvering flag and dirty 2006 * the top level so that we persist the change. 2007 */ 2008 if (vd->vdev_resilver_txg != 0 && 2009 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 && 2010 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0) { 2011 vd->vdev_resilver_txg = 0; 2012 vdev_config_dirty(vd->vdev_top); 2013 } 2014 2015 mutex_exit(&vd->vdev_dtl_lock); 2016 2017 if (txg != 0) 2018 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 2019 return; 2020 } 2021 2022 mutex_enter(&vd->vdev_dtl_lock); 2023 for (int t = 0; t < DTL_TYPES; t++) { 2024 /* account for child's outage in parent's missing map */ 2025 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 2026 if (t == DTL_SCRUB) 2027 continue; /* leaf vdevs only */ 2028 if (t == DTL_PARTIAL) 2029 minref = 1; /* i.e. non-zero */ 2030 else if (vd->vdev_nparity != 0) 2031 minref = vd->vdev_nparity + 1; /* RAID-Z */ 2032 else 2033 minref = vd->vdev_children; /* any kind of mirror */ 2034 space_reftree_create(&reftree); 2035 for (int c = 0; c < vd->vdev_children; c++) { 2036 vdev_t *cvd = vd->vdev_child[c]; 2037 mutex_enter(&cvd->vdev_dtl_lock); 2038 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 2039 mutex_exit(&cvd->vdev_dtl_lock); 2040 } 2041 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2042 space_reftree_destroy(&reftree); 2043 } 2044 mutex_exit(&vd->vdev_dtl_lock); 2045} 2046 2047int 2048vdev_dtl_load(vdev_t *vd) 2049{ 2050 spa_t *spa = vd->vdev_spa; 2051 objset_t *mos = spa->spa_meta_objset; 2052 int error = 0; 2053 2054 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2055 ASSERT(!vd->vdev_ishole); 2056 2057 error = space_map_open(&vd->vdev_dtl_sm, mos, 2058 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock); 2059 if (error) 2060 return (error); 2061 ASSERT(vd->vdev_dtl_sm != NULL); 2062 2063 mutex_enter(&vd->vdev_dtl_lock); 2064 2065 /* 2066 * Now that we've opened the space_map we need to update 2067 * the in-core DTL. 2068 */ 2069 space_map_update(vd->vdev_dtl_sm); 2070 2071 error = space_map_load(vd->vdev_dtl_sm, 2072 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2073 mutex_exit(&vd->vdev_dtl_lock); 2074 2075 return (error); 2076 } 2077 2078 for (int c = 0; c < vd->vdev_children; c++) { 2079 error = vdev_dtl_load(vd->vdev_child[c]); 2080 if (error != 0) 2081 break; 2082 } 2083 2084 return (error); 2085} 2086 2087void 2088vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2089{ 2090 spa_t *spa = vd->vdev_spa; 2091 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2092 objset_t *mos = spa->spa_meta_objset; 2093 range_tree_t *rtsync; 2094 kmutex_t rtlock; 2095 dmu_tx_t *tx; 2096 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2097 2098 ASSERT(!vd->vdev_ishole); 2099 ASSERT(vd->vdev_ops->vdev_op_leaf); 2100 2101 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2102 2103 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2104 mutex_enter(&vd->vdev_dtl_lock); 2105 space_map_free(vd->vdev_dtl_sm, tx); 2106 space_map_close(vd->vdev_dtl_sm); 2107 vd->vdev_dtl_sm = NULL; 2108 mutex_exit(&vd->vdev_dtl_lock); 2109 dmu_tx_commit(tx); 2110 return; 2111 } 2112 2113 if (vd->vdev_dtl_sm == NULL) { 2114 uint64_t new_object; 2115 2116 new_object = space_map_alloc(mos, tx); 2117 VERIFY3U(new_object, !=, 0); 2118 2119 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2120 0, -1ULL, 0, &vd->vdev_dtl_lock)); 2121 ASSERT(vd->vdev_dtl_sm != NULL); 2122 } 2123 2124 bzero(&rtlock, sizeof(rtlock)); 2125 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL); 2126 2127 rtsync = range_tree_create(NULL, NULL, &rtlock); 2128 2129 mutex_enter(&rtlock); 2130 2131 mutex_enter(&vd->vdev_dtl_lock); 2132 range_tree_walk(rt, range_tree_add, rtsync); 2133 mutex_exit(&vd->vdev_dtl_lock); 2134 2135 space_map_truncate(vd->vdev_dtl_sm, tx); 2136 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx); 2137 range_tree_vacate(rtsync, NULL, NULL); 2138 2139 range_tree_destroy(rtsync); 2140 2141 mutex_exit(&rtlock); 2142 mutex_destroy(&rtlock); 2143 2144 /* 2145 * If the object for the space map has changed then dirty 2146 * the top level so that we update the config. 2147 */ 2148 if (object != space_map_object(vd->vdev_dtl_sm)) { 2149 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, " 2150 "new object %llu", txg, spa_name(spa), object, 2151 space_map_object(vd->vdev_dtl_sm)); 2152 vdev_config_dirty(vd->vdev_top); 2153 } 2154 2155 dmu_tx_commit(tx); 2156 2157 mutex_enter(&vd->vdev_dtl_lock); 2158 space_map_update(vd->vdev_dtl_sm); 2159 mutex_exit(&vd->vdev_dtl_lock); 2160} 2161 2162/* 2163 * Determine whether the specified vdev can be offlined/detached/removed 2164 * without losing data. 2165 */ 2166boolean_t 2167vdev_dtl_required(vdev_t *vd) 2168{ 2169 spa_t *spa = vd->vdev_spa; 2170 vdev_t *tvd = vd->vdev_top; 2171 uint8_t cant_read = vd->vdev_cant_read; 2172 boolean_t required; 2173 2174 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2175 2176 if (vd == spa->spa_root_vdev || vd == tvd) 2177 return (B_TRUE); 2178 2179 /* 2180 * Temporarily mark the device as unreadable, and then determine 2181 * whether this results in any DTL outages in the top-level vdev. 2182 * If not, we can safely offline/detach/remove the device. 2183 */ 2184 vd->vdev_cant_read = B_TRUE; 2185 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2186 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2187 vd->vdev_cant_read = cant_read; 2188 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2189 2190 if (!required && zio_injection_enabled) 2191 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2192 2193 return (required); 2194} 2195 2196/* 2197 * Determine if resilver is needed, and if so the txg range. 2198 */ 2199boolean_t 2200vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2201{ 2202 boolean_t needed = B_FALSE; 2203 uint64_t thismin = UINT64_MAX; 2204 uint64_t thismax = 0; 2205 2206 if (vd->vdev_children == 0) { 2207 mutex_enter(&vd->vdev_dtl_lock); 2208 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 && 2209 vdev_writeable(vd)) { 2210 2211 thismin = vdev_dtl_min(vd); 2212 thismax = vdev_dtl_max(vd); 2213 needed = B_TRUE; 2214 } 2215 mutex_exit(&vd->vdev_dtl_lock); 2216 } else { 2217 for (int c = 0; c < vd->vdev_children; c++) { 2218 vdev_t *cvd = vd->vdev_child[c]; 2219 uint64_t cmin, cmax; 2220 2221 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2222 thismin = MIN(thismin, cmin); 2223 thismax = MAX(thismax, cmax); 2224 needed = B_TRUE; 2225 } 2226 } 2227 } 2228 2229 if (needed && minp) { 2230 *minp = thismin; 2231 *maxp = thismax; 2232 } 2233 return (needed); 2234} 2235 2236void 2237vdev_load(vdev_t *vd) 2238{ 2239 /* 2240 * Recursively load all children. 2241 */ 2242 for (int c = 0; c < vd->vdev_children; c++) 2243 vdev_load(vd->vdev_child[c]); 2244 2245 /* 2246 * If this is a top-level vdev, initialize its metaslabs. 2247 */ 2248 if (vd == vd->vdev_top && !vd->vdev_ishole && 2249 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 2250 vdev_metaslab_init(vd, 0) != 0)) 2251 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2252 VDEV_AUX_CORRUPT_DATA); 2253 2254 /* 2255 * If this is a leaf vdev, load its DTL. 2256 */ 2257 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 2258 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2259 VDEV_AUX_CORRUPT_DATA); 2260} 2261 2262/* 2263 * The special vdev case is used for hot spares and l2cache devices. Its 2264 * sole purpose it to set the vdev state for the associated vdev. To do this, 2265 * we make sure that we can open the underlying device, then try to read the 2266 * label, and make sure that the label is sane and that it hasn't been 2267 * repurposed to another pool. 2268 */ 2269int 2270vdev_validate_aux(vdev_t *vd) 2271{ 2272 nvlist_t *label; 2273 uint64_t guid, version; 2274 uint64_t state; 2275 2276 if (!vdev_readable(vd)) 2277 return (0); 2278 2279 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2280 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2281 VDEV_AUX_CORRUPT_DATA); 2282 return (-1); 2283 } 2284 2285 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2286 !SPA_VERSION_IS_SUPPORTED(version) || 2287 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2288 guid != vd->vdev_guid || 2289 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2290 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2291 VDEV_AUX_CORRUPT_DATA); 2292 nvlist_free(label); 2293 return (-1); 2294 } 2295 2296 /* 2297 * We don't actually check the pool state here. If it's in fact in 2298 * use by another pool, we update this fact on the fly when requested. 2299 */ 2300 nvlist_free(label); 2301 return (0); 2302} 2303 2304void 2305vdev_remove(vdev_t *vd, uint64_t txg) 2306{ 2307 spa_t *spa = vd->vdev_spa; 2308 objset_t *mos = spa->spa_meta_objset; 2309 dmu_tx_t *tx; 2310 2311 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2312 2313 if (vd->vdev_ms != NULL) { 2314 metaslab_group_t *mg = vd->vdev_mg; 2315 2316 metaslab_group_histogram_verify(mg); 2317 metaslab_class_histogram_verify(mg->mg_class); 2318 2319 for (int m = 0; m < vd->vdev_ms_count; m++) { 2320 metaslab_t *msp = vd->vdev_ms[m]; 2321 2322 if (msp == NULL || msp->ms_sm == NULL) 2323 continue; 2324 2325 mutex_enter(&msp->ms_lock); 2326 /* 2327 * If the metaslab was not loaded when the vdev 2328 * was removed then the histogram accounting may 2329 * not be accurate. Update the histogram information 2330 * here so that we ensure that the metaslab group 2331 * and metaslab class are up-to-date. 2332 */ 2333 metaslab_group_histogram_remove(mg, msp); 2334 2335 VERIFY0(space_map_allocated(msp->ms_sm)); 2336 space_map_free(msp->ms_sm, tx); 2337 space_map_close(msp->ms_sm); 2338 msp->ms_sm = NULL; 2339 mutex_exit(&msp->ms_lock); 2340 } 2341 2342 metaslab_group_histogram_verify(mg); 2343 metaslab_class_histogram_verify(mg->mg_class); 2344 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 2345 ASSERT0(mg->mg_histogram[i]); 2346 2347 } 2348 2349 if (vd->vdev_ms_array) { 2350 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2351 vd->vdev_ms_array = 0; 2352 } 2353 dmu_tx_commit(tx); 2354} 2355 2356void 2357vdev_sync_done(vdev_t *vd, uint64_t txg) 2358{ 2359 metaslab_t *msp; 2360 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2361 2362 ASSERT(!vd->vdev_ishole); 2363 2364 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2365 metaslab_sync_done(msp, txg); 2366 2367 if (reassess) 2368 metaslab_sync_reassess(vd->vdev_mg); 2369} 2370 2371void 2372vdev_sync(vdev_t *vd, uint64_t txg) 2373{ 2374 spa_t *spa = vd->vdev_spa; 2375 vdev_t *lvd; 2376 metaslab_t *msp; 2377 dmu_tx_t *tx; 2378 2379 ASSERT(!vd->vdev_ishole); 2380 2381 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2382 ASSERT(vd == vd->vdev_top); 2383 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2384 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2385 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2386 ASSERT(vd->vdev_ms_array != 0); 2387 vdev_config_dirty(vd); 2388 dmu_tx_commit(tx); 2389 } 2390 2391 /* 2392 * Remove the metadata associated with this vdev once it's empty. 2393 */ 2394 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2395 vdev_remove(vd, txg); 2396 2397 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2398 metaslab_sync(msp, txg); 2399 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2400 } 2401 2402 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2403 vdev_dtl_sync(lvd, txg); 2404 2405 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2406} 2407 2408uint64_t 2409vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2410{ 2411 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2412} 2413 2414/* 2415 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2416 * not be opened, and no I/O is attempted. 2417 */ 2418int 2419vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2420{ 2421 vdev_t *vd, *tvd; 2422 2423 spa_vdev_state_enter(spa, SCL_NONE); 2424 2425 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2426 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2427 2428 if (!vd->vdev_ops->vdev_op_leaf) 2429 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2430 2431 tvd = vd->vdev_top; 2432 2433 /* 2434 * We don't directly use the aux state here, but if we do a 2435 * vdev_reopen(), we need this value to be present to remember why we 2436 * were faulted. 2437 */ 2438 vd->vdev_label_aux = aux; 2439 2440 /* 2441 * Faulted state takes precedence over degraded. 2442 */ 2443 vd->vdev_delayed_close = B_FALSE; 2444 vd->vdev_faulted = 1ULL; 2445 vd->vdev_degraded = 0ULL; 2446 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2447 2448 /* 2449 * If this device has the only valid copy of the data, then 2450 * back off and simply mark the vdev as degraded instead. 2451 */ 2452 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2453 vd->vdev_degraded = 1ULL; 2454 vd->vdev_faulted = 0ULL; 2455 2456 /* 2457 * If we reopen the device and it's not dead, only then do we 2458 * mark it degraded. 2459 */ 2460 vdev_reopen(tvd); 2461 2462 if (vdev_readable(vd)) 2463 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2464 } 2465 2466 return (spa_vdev_state_exit(spa, vd, 0)); 2467} 2468 2469/* 2470 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2471 * user that something is wrong. The vdev continues to operate as normal as far 2472 * as I/O is concerned. 2473 */ 2474int 2475vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2476{ 2477 vdev_t *vd; 2478 2479 spa_vdev_state_enter(spa, SCL_NONE); 2480 2481 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2482 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2483 2484 if (!vd->vdev_ops->vdev_op_leaf) 2485 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2486 2487 /* 2488 * If the vdev is already faulted, then don't do anything. 2489 */ 2490 if (vd->vdev_faulted || vd->vdev_degraded) 2491 return (spa_vdev_state_exit(spa, NULL, 0)); 2492 2493 vd->vdev_degraded = 1ULL; 2494 if (!vdev_is_dead(vd)) 2495 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2496 aux); 2497 2498 return (spa_vdev_state_exit(spa, vd, 0)); 2499} 2500 2501/* 2502 * Online the given vdev. 2503 * 2504 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 2505 * spare device should be detached when the device finishes resilvering. 2506 * Second, the online should be treated like a 'test' online case, so no FMA 2507 * events are generated if the device fails to open. 2508 */ 2509int 2510vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2511{ 2512 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2513 boolean_t postevent = B_FALSE; 2514 2515 spa_vdev_state_enter(spa, SCL_NONE); 2516 2517 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2518 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2519 2520 if (!vd->vdev_ops->vdev_op_leaf) 2521 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2522 2523 postevent = 2524 (vd->vdev_offline == B_TRUE || vd->vdev_tmpoffline == B_TRUE) ? 2525 B_TRUE : B_FALSE; 2526 2527 tvd = vd->vdev_top; 2528 vd->vdev_offline = B_FALSE; 2529 vd->vdev_tmpoffline = B_FALSE; 2530 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2531 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2532 2533 /* XXX - L2ARC 1.0 does not support expansion */ 2534 if (!vd->vdev_aux) { 2535 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2536 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2537 } 2538 2539 vdev_reopen(tvd); 2540 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2541 2542 if (!vd->vdev_aux) { 2543 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2544 pvd->vdev_expanding = B_FALSE; 2545 } 2546 2547 if (newstate) 2548 *newstate = vd->vdev_state; 2549 if ((flags & ZFS_ONLINE_UNSPARE) && 2550 !vdev_is_dead(vd) && vd->vdev_parent && 2551 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2552 vd->vdev_parent->vdev_child[0] == vd) 2553 vd->vdev_unspare = B_TRUE; 2554 2555 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2556 2557 /* XXX - L2ARC 1.0 does not support expansion */ 2558 if (vd->vdev_aux) 2559 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2560 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2561 } 2562 2563 if (postevent) 2564 spa_event_notify(spa, vd, ESC_ZFS_VDEV_ONLINE); 2565 2566 return (spa_vdev_state_exit(spa, vd, 0)); 2567} 2568 2569static int 2570vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2571{ 2572 vdev_t *vd, *tvd; 2573 int error = 0; 2574 uint64_t generation; 2575 metaslab_group_t *mg; 2576 2577top: 2578 spa_vdev_state_enter(spa, SCL_ALLOC); 2579 2580 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2581 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2582 2583 if (!vd->vdev_ops->vdev_op_leaf) 2584 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2585 2586 tvd = vd->vdev_top; 2587 mg = tvd->vdev_mg; 2588 generation = spa->spa_config_generation + 1; 2589 2590 /* 2591 * If the device isn't already offline, try to offline it. 2592 */ 2593 if (!vd->vdev_offline) { 2594 /* 2595 * If this device has the only valid copy of some data, 2596 * don't allow it to be offlined. Log devices are always 2597 * expendable. 2598 */ 2599 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2600 vdev_dtl_required(vd)) 2601 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2602 2603 /* 2604 * If the top-level is a slog and it has had allocations 2605 * then proceed. We check that the vdev's metaslab group 2606 * is not NULL since it's possible that we may have just 2607 * added this vdev but not yet initialized its metaslabs. 2608 */ 2609 if (tvd->vdev_islog && mg != NULL) { 2610 /* 2611 * Prevent any future allocations. 2612 */ 2613 metaslab_group_passivate(mg); 2614 (void) spa_vdev_state_exit(spa, vd, 0); 2615 2616 error = spa_offline_log(spa); 2617 2618 spa_vdev_state_enter(spa, SCL_ALLOC); 2619 2620 /* 2621 * Check to see if the config has changed. 2622 */ 2623 if (error || generation != spa->spa_config_generation) { 2624 metaslab_group_activate(mg); 2625 if (error) 2626 return (spa_vdev_state_exit(spa, 2627 vd, error)); 2628 (void) spa_vdev_state_exit(spa, vd, 0); 2629 goto top; 2630 } 2631 ASSERT0(tvd->vdev_stat.vs_alloc); 2632 } 2633 2634 /* 2635 * Offline this device and reopen its top-level vdev. 2636 * If the top-level vdev is a log device then just offline 2637 * it. Otherwise, if this action results in the top-level 2638 * vdev becoming unusable, undo it and fail the request. 2639 */ 2640 vd->vdev_offline = B_TRUE; 2641 vdev_reopen(tvd); 2642 2643 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2644 vdev_is_dead(tvd)) { 2645 vd->vdev_offline = B_FALSE; 2646 vdev_reopen(tvd); 2647 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2648 } 2649 2650 /* 2651 * Add the device back into the metaslab rotor so that 2652 * once we online the device it's open for business. 2653 */ 2654 if (tvd->vdev_islog && mg != NULL) 2655 metaslab_group_activate(mg); 2656 } 2657 2658 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2659 2660 return (spa_vdev_state_exit(spa, vd, 0)); 2661} 2662 2663int 2664vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2665{ 2666 int error; 2667 2668 mutex_enter(&spa->spa_vdev_top_lock); 2669 error = vdev_offline_locked(spa, guid, flags); 2670 mutex_exit(&spa->spa_vdev_top_lock); 2671 2672 return (error); 2673} 2674 2675/* 2676 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2677 * vdev_offline(), we assume the spa config is locked. We also clear all 2678 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2679 */ 2680void 2681vdev_clear(spa_t *spa, vdev_t *vd) 2682{ 2683 vdev_t *rvd = spa->spa_root_vdev; 2684 2685 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2686 2687 if (vd == NULL) 2688 vd = rvd; 2689 2690 vd->vdev_stat.vs_read_errors = 0; 2691 vd->vdev_stat.vs_write_errors = 0; 2692 vd->vdev_stat.vs_checksum_errors = 0; 2693 2694 for (int c = 0; c < vd->vdev_children; c++) 2695 vdev_clear(spa, vd->vdev_child[c]); 2696 2697 if (vd == rvd) { 2698 for (int c = 0; c < spa->spa_l2cache.sav_count; c++) 2699 vdev_clear(spa, spa->spa_l2cache.sav_vdevs[c]); 2700 2701 for (int c = 0; c < spa->spa_spares.sav_count; c++) 2702 vdev_clear(spa, spa->spa_spares.sav_vdevs[c]); 2703 } 2704 2705 /* 2706 * If we're in the FAULTED state or have experienced failed I/O, then 2707 * clear the persistent state and attempt to reopen the device. We 2708 * also mark the vdev config dirty, so that the new faulted state is 2709 * written out to disk. 2710 */ 2711 if (vd->vdev_faulted || vd->vdev_degraded || 2712 !vdev_readable(vd) || !vdev_writeable(vd)) { 2713 2714 /* 2715 * When reopening in reponse to a clear event, it may be due to 2716 * a fmadm repair request. In this case, if the device is 2717 * still broken, we want to still post the ereport again. 2718 */ 2719 vd->vdev_forcefault = B_TRUE; 2720 2721 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2722 vd->vdev_cant_read = B_FALSE; 2723 vd->vdev_cant_write = B_FALSE; 2724 2725 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2726 2727 vd->vdev_forcefault = B_FALSE; 2728 2729 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2730 vdev_state_dirty(vd->vdev_top); 2731 2732 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2733 spa_async_request(spa, SPA_ASYNC_RESILVER); 2734 2735 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2736 } 2737 2738 /* 2739 * When clearing a FMA-diagnosed fault, we always want to 2740 * unspare the device, as we assume that the original spare was 2741 * done in response to the FMA fault. 2742 */ 2743 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2744 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2745 vd->vdev_parent->vdev_child[0] == vd) 2746 vd->vdev_unspare = B_TRUE; 2747} 2748 2749boolean_t 2750vdev_is_dead(vdev_t *vd) 2751{ 2752 /* 2753 * Holes and missing devices are always considered "dead". 2754 * This simplifies the code since we don't have to check for 2755 * these types of devices in the various code paths. 2756 * Instead we rely on the fact that we skip over dead devices 2757 * before issuing I/O to them. 2758 */ 2759 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2760 vd->vdev_ops == &vdev_missing_ops); 2761} 2762 2763boolean_t 2764vdev_readable(vdev_t *vd) 2765{ 2766 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2767} 2768 2769boolean_t 2770vdev_writeable(vdev_t *vd) 2771{ 2772 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2773} 2774 2775boolean_t 2776vdev_allocatable(vdev_t *vd) 2777{ 2778 uint64_t state = vd->vdev_state; 2779 2780 /* 2781 * We currently allow allocations from vdevs which may be in the 2782 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2783 * fails to reopen then we'll catch it later when we're holding 2784 * the proper locks. Note that we have to get the vdev state 2785 * in a local variable because although it changes atomically, 2786 * we're asking two separate questions about it. 2787 */ 2788 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2789 !vd->vdev_cant_write && !vd->vdev_ishole && 2790 vd->vdev_mg->mg_initialized); 2791} 2792 2793boolean_t 2794vdev_accessible(vdev_t *vd, zio_t *zio) 2795{ 2796 ASSERT(zio->io_vd == vd); 2797 2798 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2799 return (B_FALSE); 2800 2801 if (zio->io_type == ZIO_TYPE_READ) 2802 return (!vd->vdev_cant_read); 2803 2804 if (zio->io_type == ZIO_TYPE_WRITE) 2805 return (!vd->vdev_cant_write); 2806 2807 return (B_TRUE); 2808} 2809 2810/* 2811 * Get statistics for the given vdev. 2812 */ 2813void 2814vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2815{ 2816 spa_t *spa = vd->vdev_spa; 2817 vdev_t *rvd = spa->spa_root_vdev; 2818 vdev_t *tvd = vd->vdev_top; 2819 2820 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2821 2822 mutex_enter(&vd->vdev_stat_lock); 2823 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2824 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2825 vs->vs_state = vd->vdev_state; 2826 vs->vs_rsize = vdev_get_min_asize(vd); 2827 if (vd->vdev_ops->vdev_op_leaf) 2828 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2829 /* 2830 * Report expandable space on top-level, non-auxillary devices only. 2831 * The expandable space is reported in terms of metaslab sized units 2832 * since that determines how much space the pool can expand. 2833 */ 2834 if (vd->vdev_aux == NULL && tvd != NULL && vd->vdev_max_asize != 0) { 2835 vs->vs_esize = P2ALIGN(vd->vdev_max_asize - vd->vdev_asize, 2836 1ULL << tvd->vdev_ms_shift); 2837 } 2838 vs->vs_configured_ashift = vd->vdev_top != NULL 2839 ? vd->vdev_top->vdev_ashift : vd->vdev_ashift; 2840 vs->vs_logical_ashift = vd->vdev_logical_ashift; 2841 vs->vs_physical_ashift = vd->vdev_physical_ashift; 2842 if (vd->vdev_aux == NULL && vd == vd->vdev_top && !vd->vdev_ishole) { 2843 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation; 2844 } 2845 2846 /* 2847 * If we're getting stats on the root vdev, aggregate the I/O counts 2848 * over all top-level vdevs (i.e. the direct children of the root). 2849 */ 2850 if (vd == rvd) { 2851 for (int c = 0; c < rvd->vdev_children; c++) { 2852 vdev_t *cvd = rvd->vdev_child[c]; 2853 vdev_stat_t *cvs = &cvd->vdev_stat; 2854 2855 for (int t = 0; t < ZIO_TYPES; t++) { 2856 vs->vs_ops[t] += cvs->vs_ops[t]; 2857 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2858 } 2859 cvs->vs_scan_removing = cvd->vdev_removing; 2860 } 2861 } 2862 mutex_exit(&vd->vdev_stat_lock); 2863} 2864 2865void 2866vdev_clear_stats(vdev_t *vd) 2867{ 2868 mutex_enter(&vd->vdev_stat_lock); 2869 vd->vdev_stat.vs_space = 0; 2870 vd->vdev_stat.vs_dspace = 0; 2871 vd->vdev_stat.vs_alloc = 0; 2872 mutex_exit(&vd->vdev_stat_lock); 2873} 2874 2875void 2876vdev_scan_stat_init(vdev_t *vd) 2877{ 2878 vdev_stat_t *vs = &vd->vdev_stat; 2879 2880 for (int c = 0; c < vd->vdev_children; c++) 2881 vdev_scan_stat_init(vd->vdev_child[c]); 2882 2883 mutex_enter(&vd->vdev_stat_lock); 2884 vs->vs_scan_processed = 0; 2885 mutex_exit(&vd->vdev_stat_lock); 2886} 2887 2888void 2889vdev_stat_update(zio_t *zio, uint64_t psize) 2890{ 2891 spa_t *spa = zio->io_spa; 2892 vdev_t *rvd = spa->spa_root_vdev; 2893 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2894 vdev_t *pvd; 2895 uint64_t txg = zio->io_txg; 2896 vdev_stat_t *vs = &vd->vdev_stat; 2897 zio_type_t type = zio->io_type; 2898 int flags = zio->io_flags; 2899 2900 /* 2901 * If this i/o is a gang leader, it didn't do any actual work. 2902 */ 2903 if (zio->io_gang_tree) 2904 return; 2905 2906 if (zio->io_error == 0) { 2907 /* 2908 * If this is a root i/o, don't count it -- we've already 2909 * counted the top-level vdevs, and vdev_get_stats() will 2910 * aggregate them when asked. This reduces contention on 2911 * the root vdev_stat_lock and implicitly handles blocks 2912 * that compress away to holes, for which there is no i/o. 2913 * (Holes never create vdev children, so all the counters 2914 * remain zero, which is what we want.) 2915 * 2916 * Note: this only applies to successful i/o (io_error == 0) 2917 * because unlike i/o counts, errors are not additive. 2918 * When reading a ditto block, for example, failure of 2919 * one top-level vdev does not imply a root-level error. 2920 */ 2921 if (vd == rvd) 2922 return; 2923 2924 ASSERT(vd == zio->io_vd); 2925 2926 if (flags & ZIO_FLAG_IO_BYPASS) 2927 return; 2928 2929 mutex_enter(&vd->vdev_stat_lock); 2930 2931 if (flags & ZIO_FLAG_IO_REPAIR) { 2932 if (flags & ZIO_FLAG_SCAN_THREAD) { 2933 dsl_scan_phys_t *scn_phys = 2934 &spa->spa_dsl_pool->dp_scan->scn_phys; 2935 uint64_t *processed = &scn_phys->scn_processed; 2936 2937 /* XXX cleanup? */ 2938 if (vd->vdev_ops->vdev_op_leaf) 2939 atomic_add_64(processed, psize); 2940 vs->vs_scan_processed += psize; 2941 } 2942 2943 if (flags & ZIO_FLAG_SELF_HEAL) 2944 vs->vs_self_healed += psize; 2945 } 2946 2947 vs->vs_ops[type]++; 2948 vs->vs_bytes[type] += psize; 2949 2950 mutex_exit(&vd->vdev_stat_lock); 2951 return; 2952 } 2953 2954 if (flags & ZIO_FLAG_SPECULATIVE) 2955 return; 2956 2957 /* 2958 * If this is an I/O error that is going to be retried, then ignore the 2959 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2960 * hard errors, when in reality they can happen for any number of 2961 * innocuous reasons (bus resets, MPxIO link failure, etc). 2962 */ 2963 if (zio->io_error == EIO && 2964 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2965 return; 2966 2967 /* 2968 * Intent logs writes won't propagate their error to the root 2969 * I/O so don't mark these types of failures as pool-level 2970 * errors. 2971 */ 2972 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2973 return; 2974 2975 mutex_enter(&vd->vdev_stat_lock); 2976 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2977 if (zio->io_error == ECKSUM) 2978 vs->vs_checksum_errors++; 2979 else 2980 vs->vs_read_errors++; 2981 } 2982 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2983 vs->vs_write_errors++; 2984 mutex_exit(&vd->vdev_stat_lock); 2985 2986 if (type == ZIO_TYPE_WRITE && txg != 0 && 2987 (!(flags & ZIO_FLAG_IO_REPAIR) || 2988 (flags & ZIO_FLAG_SCAN_THREAD) || 2989 spa->spa_claiming)) { 2990 /* 2991 * This is either a normal write (not a repair), or it's 2992 * a repair induced by the scrub thread, or it's a repair 2993 * made by zil_claim() during spa_load() in the first txg. 2994 * In the normal case, we commit the DTL change in the same 2995 * txg as the block was born. In the scrub-induced repair 2996 * case, we know that scrubs run in first-pass syncing context, 2997 * so we commit the DTL change in spa_syncing_txg(spa). 2998 * In the zil_claim() case, we commit in spa_first_txg(spa). 2999 * 3000 * We currently do not make DTL entries for failed spontaneous 3001 * self-healing writes triggered by normal (non-scrubbing) 3002 * reads, because we have no transactional context in which to 3003 * do so -- and it's not clear that it'd be desirable anyway. 3004 */ 3005 if (vd->vdev_ops->vdev_op_leaf) { 3006 uint64_t commit_txg = txg; 3007 if (flags & ZIO_FLAG_SCAN_THREAD) { 3008 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 3009 ASSERT(spa_sync_pass(spa) == 1); 3010 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 3011 commit_txg = spa_syncing_txg(spa); 3012 } else if (spa->spa_claiming) { 3013 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 3014 commit_txg = spa_first_txg(spa); 3015 } 3016 ASSERT(commit_txg >= spa_syncing_txg(spa)); 3017 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 3018 return; 3019 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3020 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 3021 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 3022 } 3023 if (vd != rvd) 3024 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 3025 } 3026} 3027 3028/* 3029 * Update the in-core space usage stats for this vdev, its metaslab class, 3030 * and the root vdev. 3031 */ 3032void 3033vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 3034 int64_t space_delta) 3035{ 3036 int64_t dspace_delta = space_delta; 3037 spa_t *spa = vd->vdev_spa; 3038 vdev_t *rvd = spa->spa_root_vdev; 3039 metaslab_group_t *mg = vd->vdev_mg; 3040 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 3041 3042 ASSERT(vd == vd->vdev_top); 3043 3044 /* 3045 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 3046 * factor. We must calculate this here and not at the root vdev 3047 * because the root vdev's psize-to-asize is simply the max of its 3048 * childrens', thus not accurate enough for us. 3049 */ 3050 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 3051 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 3052 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 3053 vd->vdev_deflate_ratio; 3054 3055 mutex_enter(&vd->vdev_stat_lock); 3056 vd->vdev_stat.vs_alloc += alloc_delta; 3057 vd->vdev_stat.vs_space += space_delta; 3058 vd->vdev_stat.vs_dspace += dspace_delta; 3059 mutex_exit(&vd->vdev_stat_lock); 3060 3061 if (mc == spa_normal_class(spa)) { 3062 mutex_enter(&rvd->vdev_stat_lock); 3063 rvd->vdev_stat.vs_alloc += alloc_delta; 3064 rvd->vdev_stat.vs_space += space_delta; 3065 rvd->vdev_stat.vs_dspace += dspace_delta; 3066 mutex_exit(&rvd->vdev_stat_lock); 3067 } 3068 3069 if (mc != NULL) { 3070 ASSERT(rvd == vd->vdev_parent); 3071 ASSERT(vd->vdev_ms_count != 0); 3072 3073 metaslab_class_space_update(mc, 3074 alloc_delta, defer_delta, space_delta, dspace_delta); 3075 } 3076} 3077 3078/* 3079 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3080 * so that it will be written out next time the vdev configuration is synced. 3081 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3082 */ 3083void 3084vdev_config_dirty(vdev_t *vd) 3085{ 3086 spa_t *spa = vd->vdev_spa; 3087 vdev_t *rvd = spa->spa_root_vdev; 3088 int c; 3089 3090 ASSERT(spa_writeable(spa)); 3091 3092 /* 3093 * If this is an aux vdev (as with l2cache and spare devices), then we 3094 * update the vdev config manually and set the sync flag. 3095 */ 3096 if (vd->vdev_aux != NULL) { 3097 spa_aux_vdev_t *sav = vd->vdev_aux; 3098 nvlist_t **aux; 3099 uint_t naux; 3100 3101 for (c = 0; c < sav->sav_count; c++) { 3102 if (sav->sav_vdevs[c] == vd) 3103 break; 3104 } 3105 3106 if (c == sav->sav_count) { 3107 /* 3108 * We're being removed. There's nothing more to do. 3109 */ 3110 ASSERT(sav->sav_sync == B_TRUE); 3111 return; 3112 } 3113 3114 sav->sav_sync = B_TRUE; 3115 3116 if (nvlist_lookup_nvlist_array(sav->sav_config, 3117 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3118 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3119 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3120 } 3121 3122 ASSERT(c < naux); 3123 3124 /* 3125 * Setting the nvlist in the middle if the array is a little 3126 * sketchy, but it will work. 3127 */ 3128 nvlist_free(aux[c]); 3129 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3130 3131 return; 3132 } 3133 3134 /* 3135 * The dirty list is protected by the SCL_CONFIG lock. The caller 3136 * must either hold SCL_CONFIG as writer, or must be the sync thread 3137 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3138 * so this is sufficient to ensure mutual exclusion. 3139 */ 3140 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3141 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3142 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3143 3144 if (vd == rvd) { 3145 for (c = 0; c < rvd->vdev_children; c++) 3146 vdev_config_dirty(rvd->vdev_child[c]); 3147 } else { 3148 ASSERT(vd == vd->vdev_top); 3149 3150 if (!list_link_active(&vd->vdev_config_dirty_node) && 3151 !vd->vdev_ishole) 3152 list_insert_head(&spa->spa_config_dirty_list, vd); 3153 } 3154} 3155 3156void 3157vdev_config_clean(vdev_t *vd) 3158{ 3159 spa_t *spa = vd->vdev_spa; 3160 3161 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3162 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3163 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3164 3165 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3166 list_remove(&spa->spa_config_dirty_list, vd); 3167} 3168 3169/* 3170 * Mark a top-level vdev's state as dirty, so that the next pass of 3171 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3172 * the state changes from larger config changes because they require 3173 * much less locking, and are often needed for administrative actions. 3174 */ 3175void 3176vdev_state_dirty(vdev_t *vd) 3177{ 3178 spa_t *spa = vd->vdev_spa; 3179 3180 ASSERT(spa_writeable(spa)); 3181 ASSERT(vd == vd->vdev_top); 3182 3183 /* 3184 * The state list is protected by the SCL_STATE lock. The caller 3185 * must either hold SCL_STATE as writer, or must be the sync thread 3186 * (which holds SCL_STATE as reader). There's only one sync thread, 3187 * so this is sufficient to ensure mutual exclusion. 3188 */ 3189 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3190 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3191 spa_config_held(spa, SCL_STATE, RW_READER))); 3192 3193 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 3194 list_insert_head(&spa->spa_state_dirty_list, vd); 3195} 3196 3197void 3198vdev_state_clean(vdev_t *vd) 3199{ 3200 spa_t *spa = vd->vdev_spa; 3201 3202 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3203 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3204 spa_config_held(spa, SCL_STATE, RW_READER))); 3205 3206 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3207 list_remove(&spa->spa_state_dirty_list, vd); 3208} 3209 3210/* 3211 * Propagate vdev state up from children to parent. 3212 */ 3213void 3214vdev_propagate_state(vdev_t *vd) 3215{ 3216 spa_t *spa = vd->vdev_spa; 3217 vdev_t *rvd = spa->spa_root_vdev; 3218 int degraded = 0, faulted = 0; 3219 int corrupted = 0; 3220 vdev_t *child; 3221 3222 if (vd->vdev_children > 0) { 3223 for (int c = 0; c < vd->vdev_children; c++) { 3224 child = vd->vdev_child[c]; 3225 3226 /* 3227 * Don't factor holes into the decision. 3228 */ 3229 if (child->vdev_ishole) 3230 continue; 3231 3232 if (!vdev_readable(child) || 3233 (!vdev_writeable(child) && spa_writeable(spa))) { 3234 /* 3235 * Root special: if there is a top-level log 3236 * device, treat the root vdev as if it were 3237 * degraded. 3238 */ 3239 if (child->vdev_islog && vd == rvd) 3240 degraded++; 3241 else 3242 faulted++; 3243 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3244 degraded++; 3245 } 3246 3247 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3248 corrupted++; 3249 } 3250 3251 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3252 3253 /* 3254 * Root special: if there is a top-level vdev that cannot be 3255 * opened due to corrupted metadata, then propagate the root 3256 * vdev's aux state as 'corrupt' rather than 'insufficient 3257 * replicas'. 3258 */ 3259 if (corrupted && vd == rvd && 3260 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3261 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3262 VDEV_AUX_CORRUPT_DATA); 3263 } 3264 3265 if (vd->vdev_parent) 3266 vdev_propagate_state(vd->vdev_parent); 3267} 3268 3269/* 3270 * Set a vdev's state. If this is during an open, we don't update the parent 3271 * state, because we're in the process of opening children depth-first. 3272 * Otherwise, we propagate the change to the parent. 3273 * 3274 * If this routine places a device in a faulted state, an appropriate ereport is 3275 * generated. 3276 */ 3277void 3278vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 3279{ 3280 uint64_t save_state; 3281 spa_t *spa = vd->vdev_spa; 3282 3283 if (state == vd->vdev_state) { 3284 vd->vdev_stat.vs_aux = aux; 3285 return; 3286 } 3287 3288 save_state = vd->vdev_state; 3289 3290 vd->vdev_state = state; 3291 vd->vdev_stat.vs_aux = aux; 3292 3293 /* 3294 * If we are setting the vdev state to anything but an open state, then 3295 * always close the underlying device unless the device has requested 3296 * a delayed close (i.e. we're about to remove or fault the device). 3297 * Otherwise, we keep accessible but invalid devices open forever. 3298 * We don't call vdev_close() itself, because that implies some extra 3299 * checks (offline, etc) that we don't want here. This is limited to 3300 * leaf devices, because otherwise closing the device will affect other 3301 * children. 3302 */ 3303 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 3304 vd->vdev_ops->vdev_op_leaf) 3305 vd->vdev_ops->vdev_op_close(vd); 3306 3307 /* 3308 * If we have brought this vdev back into service, we need 3309 * to notify fmd so that it can gracefully repair any outstanding 3310 * cases due to a missing device. We do this in all cases, even those 3311 * that probably don't correlate to a repaired fault. This is sure to 3312 * catch all cases, and we let the zfs-retire agent sort it out. If 3313 * this is a transient state it's OK, as the retire agent will 3314 * double-check the state of the vdev before repairing it. 3315 */ 3316 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 3317 vd->vdev_prevstate != state) 3318 zfs_post_state_change(spa, vd); 3319 3320 if (vd->vdev_removed && 3321 state == VDEV_STATE_CANT_OPEN && 3322 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 3323 /* 3324 * If the previous state is set to VDEV_STATE_REMOVED, then this 3325 * device was previously marked removed and someone attempted to 3326 * reopen it. If this failed due to a nonexistent device, then 3327 * keep the device in the REMOVED state. We also let this be if 3328 * it is one of our special test online cases, which is only 3329 * attempting to online the device and shouldn't generate an FMA 3330 * fault. 3331 */ 3332 vd->vdev_state = VDEV_STATE_REMOVED; 3333 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 3334 } else if (state == VDEV_STATE_REMOVED) { 3335 vd->vdev_removed = B_TRUE; 3336 } else if (state == VDEV_STATE_CANT_OPEN) { 3337 /* 3338 * If we fail to open a vdev during an import or recovery, we 3339 * mark it as "not available", which signifies that it was 3340 * never there to begin with. Failure to open such a device 3341 * is not considered an error. 3342 */ 3343 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 3344 spa_load_state(spa) == SPA_LOAD_RECOVER) && 3345 vd->vdev_ops->vdev_op_leaf) 3346 vd->vdev_not_present = 1; 3347 3348 /* 3349 * Post the appropriate ereport. If the 'prevstate' field is 3350 * set to something other than VDEV_STATE_UNKNOWN, it indicates 3351 * that this is part of a vdev_reopen(). In this case, we don't 3352 * want to post the ereport if the device was already in the 3353 * CANT_OPEN state beforehand. 3354 * 3355 * If the 'checkremove' flag is set, then this is an attempt to 3356 * online the device in response to an insertion event. If we 3357 * hit this case, then we have detected an insertion event for a 3358 * faulted or offline device that wasn't in the removed state. 3359 * In this scenario, we don't post an ereport because we are 3360 * about to replace the device, or attempt an online with 3361 * vdev_forcefault, which will generate the fault for us. 3362 */ 3363 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 3364 !vd->vdev_not_present && !vd->vdev_checkremove && 3365 vd != spa->spa_root_vdev) { 3366 const char *class; 3367 3368 switch (aux) { 3369 case VDEV_AUX_OPEN_FAILED: 3370 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 3371 break; 3372 case VDEV_AUX_CORRUPT_DATA: 3373 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3374 break; 3375 case VDEV_AUX_NO_REPLICAS: 3376 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3377 break; 3378 case VDEV_AUX_BAD_GUID_SUM: 3379 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3380 break; 3381 case VDEV_AUX_TOO_SMALL: 3382 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3383 break; 3384 case VDEV_AUX_BAD_LABEL: 3385 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3386 break; 3387 default: 3388 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3389 } 3390 3391 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3392 } 3393 3394 /* Erase any notion of persistent removed state */ 3395 vd->vdev_removed = B_FALSE; 3396 } else { 3397 vd->vdev_removed = B_FALSE; 3398 } 3399 3400 if (!isopen && vd->vdev_parent) 3401 vdev_propagate_state(vd->vdev_parent); 3402} 3403 3404/* 3405 * Check the vdev configuration to ensure that it's capable of supporting 3406 * a root pool. 3407 * 3408 * On Solaris, we do not support RAID-Z or partial configuration. In 3409 * addition, only a single top-level vdev is allowed and none of the 3410 * leaves can be wholedisks. 3411 * 3412 * For FreeBSD, we can boot from any configuration. There is a 3413 * limitation that the boot filesystem must be either uncompressed or 3414 * compresses with lzjb compression but I'm not sure how to enforce 3415 * that here. 3416 */ 3417boolean_t 3418vdev_is_bootable(vdev_t *vd) 3419{ 3420#ifdef illumos 3421 if (!vd->vdev_ops->vdev_op_leaf) { 3422 char *vdev_type = vd->vdev_ops->vdev_op_type; 3423 3424 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3425 vd->vdev_children > 1) { 3426 return (B_FALSE); 3427 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3428 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3429 return (B_FALSE); 3430 } 3431 } 3432 3433 for (int c = 0; c < vd->vdev_children; c++) { 3434 if (!vdev_is_bootable(vd->vdev_child[c])) 3435 return (B_FALSE); 3436 } 3437#endif /* illumos */ 3438 return (B_TRUE); 3439} 3440 3441/* 3442 * Load the state from the original vdev tree (ovd) which 3443 * we've retrieved from the MOS config object. If the original 3444 * vdev was offline or faulted then we transfer that state to the 3445 * device in the current vdev tree (nvd). 3446 */ 3447void 3448vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3449{ 3450 spa_t *spa = nvd->vdev_spa; 3451 3452 ASSERT(nvd->vdev_top->vdev_islog); 3453 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3454 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3455 3456 for (int c = 0; c < nvd->vdev_children; c++) 3457 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3458 3459 if (nvd->vdev_ops->vdev_op_leaf) { 3460 /* 3461 * Restore the persistent vdev state 3462 */ 3463 nvd->vdev_offline = ovd->vdev_offline; 3464 nvd->vdev_faulted = ovd->vdev_faulted; 3465 nvd->vdev_degraded = ovd->vdev_degraded; 3466 nvd->vdev_removed = ovd->vdev_removed; 3467 } 3468} 3469 3470/* 3471 * Determine if a log device has valid content. If the vdev was 3472 * removed or faulted in the MOS config then we know that 3473 * the content on the log device has already been written to the pool. 3474 */ 3475boolean_t 3476vdev_log_state_valid(vdev_t *vd) 3477{ 3478 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3479 !vd->vdev_removed) 3480 return (B_TRUE); 3481 3482 for (int c = 0; c < vd->vdev_children; c++) 3483 if (vdev_log_state_valid(vd->vdev_child[c])) 3484 return (B_TRUE); 3485 3486 return (B_FALSE); 3487} 3488 3489/* 3490 * Expand a vdev if possible. 3491 */ 3492void 3493vdev_expand(vdev_t *vd, uint64_t txg) 3494{ 3495 ASSERT(vd->vdev_top == vd); 3496 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3497 3498 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3499 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3500 vdev_config_dirty(vd); 3501 } 3502} 3503 3504/* 3505 * Split a vdev. 3506 */ 3507void 3508vdev_split(vdev_t *vd) 3509{ 3510 vdev_t *cvd, *pvd = vd->vdev_parent; 3511 3512 vdev_remove_child(pvd, vd); 3513 vdev_compact_children(pvd); 3514 3515 cvd = pvd->vdev_child[0]; 3516 if (pvd->vdev_children == 1) { 3517 vdev_remove_parent(cvd); 3518 cvd->vdev_splitting = B_TRUE; 3519 } 3520 vdev_propagate_state(cvd); 3521} 3522 3523void 3524vdev_deadman(vdev_t *vd) 3525{ 3526 for (int c = 0; c < vd->vdev_children; c++) { 3527 vdev_t *cvd = vd->vdev_child[c]; 3528 3529 vdev_deadman(cvd); 3530 } 3531 3532 if (vd->vdev_ops->vdev_op_leaf) { 3533 vdev_queue_t *vq = &vd->vdev_queue; 3534 3535 mutex_enter(&vq->vq_lock); 3536 if (avl_numnodes(&vq->vq_active_tree) > 0) { 3537 spa_t *spa = vd->vdev_spa; 3538 zio_t *fio; 3539 uint64_t delta; 3540 3541 /* 3542 * Look at the head of all the pending queues, 3543 * if any I/O has been outstanding for longer than 3544 * the spa_deadman_synctime we panic the system. 3545 */ 3546 fio = avl_first(&vq->vq_active_tree); 3547 delta = gethrtime() - fio->io_timestamp; 3548 if (delta > spa_deadman_synctime(spa)) { 3549 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, " 3550 "delta %lluns, last io %lluns", 3551 fio->io_timestamp, delta, 3552 vq->vq_io_complete_ts); 3553 fm_panic("I/O to pool '%s' appears to be " 3554 "hung on vdev guid %llu at '%s'.", 3555 spa_name(spa), 3556 (long long unsigned int) vd->vdev_guid, 3557 vd->vdev_path); 3558 } 3559 } 3560 mutex_exit(&vq->vq_lock); 3561 } 3562} 3563