vdev.c revision 290761
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 26 * Copyright 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 */ 28 29#include <sys/zfs_context.h> 30#include <sys/fm/fs/zfs.h> 31#include <sys/spa.h> 32#include <sys/spa_impl.h> 33#include <sys/dmu.h> 34#include <sys/dmu_tx.h> 35#include <sys/vdev_impl.h> 36#include <sys/uberblock_impl.h> 37#include <sys/metaslab.h> 38#include <sys/metaslab_impl.h> 39#include <sys/space_map.h> 40#include <sys/space_reftree.h> 41#include <sys/zio.h> 42#include <sys/zap.h> 43#include <sys/fs/zfs.h> 44#include <sys/arc.h> 45#include <sys/zil.h> 46#include <sys/dsl_scan.h> 47#include <sys/trim_map.h> 48 49SYSCTL_DECL(_vfs_zfs); 50SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 51 52/* 53 * Virtual device management. 54 */ 55 56/* 57 * The limit for ZFS to automatically increase a top-level vdev's ashift 58 * from logical ashift to physical ashift. 59 * 60 * Example: one or more 512B emulation child vdevs 61 * child->vdev_ashift = 9 (512 bytes) 62 * child->vdev_physical_ashift = 12 (4096 bytes) 63 * zfs_max_auto_ashift = 11 (2048 bytes) 64 * zfs_min_auto_ashift = 9 (512 bytes) 65 * 66 * On pool creation or the addition of a new top-level vdev, ZFS will 67 * increase the ashift of the top-level vdev to 2048 as limited by 68 * zfs_max_auto_ashift. 69 * 70 * Example: one or more 512B emulation child vdevs 71 * child->vdev_ashift = 9 (512 bytes) 72 * child->vdev_physical_ashift = 12 (4096 bytes) 73 * zfs_max_auto_ashift = 13 (8192 bytes) 74 * zfs_min_auto_ashift = 9 (512 bytes) 75 * 76 * On pool creation or the addition of a new top-level vdev, ZFS will 77 * increase the ashift of the top-level vdev to 4096 to match the 78 * max vdev_physical_ashift. 79 * 80 * Example: one or more 512B emulation child vdevs 81 * child->vdev_ashift = 9 (512 bytes) 82 * child->vdev_physical_ashift = 9 (512 bytes) 83 * zfs_max_auto_ashift = 13 (8192 bytes) 84 * zfs_min_auto_ashift = 12 (4096 bytes) 85 * 86 * On pool creation or the addition of a new top-level vdev, ZFS will 87 * increase the ashift of the top-level vdev to 4096 to match the 88 * zfs_min_auto_ashift. 89 */ 90static uint64_t zfs_max_auto_ashift = SPA_MAXASHIFT; 91static uint64_t zfs_min_auto_ashift = SPA_MINASHIFT; 92 93static int 94sysctl_vfs_zfs_max_auto_ashift(SYSCTL_HANDLER_ARGS) 95{ 96 uint64_t val; 97 int err; 98 99 val = zfs_max_auto_ashift; 100 err = sysctl_handle_64(oidp, &val, 0, req); 101 if (err != 0 || req->newptr == NULL) 102 return (err); 103 104 if (val > SPA_MAXASHIFT || val < zfs_min_auto_ashift) 105 return (EINVAL); 106 107 zfs_max_auto_ashift = val; 108 109 return (0); 110} 111SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift, 112 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 113 sysctl_vfs_zfs_max_auto_ashift, "QU", 114 "Max ashift used when optimising for logical -> physical sectors size on " 115 "new top-level vdevs."); 116 117static int 118sysctl_vfs_zfs_min_auto_ashift(SYSCTL_HANDLER_ARGS) 119{ 120 uint64_t val; 121 int err; 122 123 val = zfs_min_auto_ashift; 124 err = sysctl_handle_64(oidp, &val, 0, req); 125 if (err != 0 || req->newptr == NULL) 126 return (err); 127 128 if (val < SPA_MINASHIFT || val > zfs_max_auto_ashift) 129 return (EINVAL); 130 131 zfs_min_auto_ashift = val; 132 133 return (0); 134} 135SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift, 136 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 137 sysctl_vfs_zfs_min_auto_ashift, "QU", 138 "Min ashift used when creating new top-level vdevs."); 139 140static vdev_ops_t *vdev_ops_table[] = { 141 &vdev_root_ops, 142 &vdev_raidz_ops, 143 &vdev_mirror_ops, 144 &vdev_replacing_ops, 145 &vdev_spare_ops, 146#ifdef _KERNEL 147 &vdev_geom_ops, 148#else 149 &vdev_disk_ops, 150#endif 151 &vdev_file_ops, 152 &vdev_missing_ops, 153 &vdev_hole_ops, 154 NULL 155}; 156 157 158/* 159 * When a vdev is added, it will be divided into approximately (but no 160 * more than) this number of metaslabs. 161 */ 162int metaslabs_per_vdev = 200; 163SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, metaslabs_per_vdev, CTLFLAG_RDTUN, 164 &metaslabs_per_vdev, 0, 165 "When a vdev is added, how many metaslabs the vdev should be divided into"); 166 167/* 168 * Given a vdev type, return the appropriate ops vector. 169 */ 170static vdev_ops_t * 171vdev_getops(const char *type) 172{ 173 vdev_ops_t *ops, **opspp; 174 175 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 176 if (strcmp(ops->vdev_op_type, type) == 0) 177 break; 178 179 return (ops); 180} 181 182/* 183 * Default asize function: return the MAX of psize with the asize of 184 * all children. This is what's used by anything other than RAID-Z. 185 */ 186uint64_t 187vdev_default_asize(vdev_t *vd, uint64_t psize) 188{ 189 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 190 uint64_t csize; 191 192 for (int c = 0; c < vd->vdev_children; c++) { 193 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 194 asize = MAX(asize, csize); 195 } 196 197 return (asize); 198} 199 200/* 201 * Get the minimum allocatable size. We define the allocatable size as 202 * the vdev's asize rounded to the nearest metaslab. This allows us to 203 * replace or attach devices which don't have the same physical size but 204 * can still satisfy the same number of allocations. 205 */ 206uint64_t 207vdev_get_min_asize(vdev_t *vd) 208{ 209 vdev_t *pvd = vd->vdev_parent; 210 211 /* 212 * If our parent is NULL (inactive spare or cache) or is the root, 213 * just return our own asize. 214 */ 215 if (pvd == NULL) 216 return (vd->vdev_asize); 217 218 /* 219 * The top-level vdev just returns the allocatable size rounded 220 * to the nearest metaslab. 221 */ 222 if (vd == vd->vdev_top) 223 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 224 225 /* 226 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 227 * so each child must provide at least 1/Nth of its asize. 228 */ 229 if (pvd->vdev_ops == &vdev_raidz_ops) 230 return (pvd->vdev_min_asize / pvd->vdev_children); 231 232 return (pvd->vdev_min_asize); 233} 234 235void 236vdev_set_min_asize(vdev_t *vd) 237{ 238 vd->vdev_min_asize = vdev_get_min_asize(vd); 239 240 for (int c = 0; c < vd->vdev_children; c++) 241 vdev_set_min_asize(vd->vdev_child[c]); 242} 243 244vdev_t * 245vdev_lookup_top(spa_t *spa, uint64_t vdev) 246{ 247 vdev_t *rvd = spa->spa_root_vdev; 248 249 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 250 251 if (vdev < rvd->vdev_children) { 252 ASSERT(rvd->vdev_child[vdev] != NULL); 253 return (rvd->vdev_child[vdev]); 254 } 255 256 return (NULL); 257} 258 259vdev_t * 260vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 261{ 262 vdev_t *mvd; 263 264 if (vd->vdev_guid == guid) 265 return (vd); 266 267 for (int c = 0; c < vd->vdev_children; c++) 268 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 269 NULL) 270 return (mvd); 271 272 return (NULL); 273} 274 275static int 276vdev_count_leaves_impl(vdev_t *vd) 277{ 278 int n = 0; 279 280 if (vd->vdev_ops->vdev_op_leaf) 281 return (1); 282 283 for (int c = 0; c < vd->vdev_children; c++) 284 n += vdev_count_leaves_impl(vd->vdev_child[c]); 285 286 return (n); 287} 288 289int 290vdev_count_leaves(spa_t *spa) 291{ 292 return (vdev_count_leaves_impl(spa->spa_root_vdev)); 293} 294 295void 296vdev_add_child(vdev_t *pvd, vdev_t *cvd) 297{ 298 size_t oldsize, newsize; 299 uint64_t id = cvd->vdev_id; 300 vdev_t **newchild; 301 spa_t *spa = cvd->vdev_spa; 302 303 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 304 ASSERT(cvd->vdev_parent == NULL); 305 306 cvd->vdev_parent = pvd; 307 308 if (pvd == NULL) 309 return; 310 311 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 312 313 oldsize = pvd->vdev_children * sizeof (vdev_t *); 314 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 315 newsize = pvd->vdev_children * sizeof (vdev_t *); 316 317 newchild = kmem_zalloc(newsize, KM_SLEEP); 318 if (pvd->vdev_child != NULL) { 319 bcopy(pvd->vdev_child, newchild, oldsize); 320 kmem_free(pvd->vdev_child, oldsize); 321 } 322 323 pvd->vdev_child = newchild; 324 pvd->vdev_child[id] = cvd; 325 326 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 327 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 328 329 /* 330 * Walk up all ancestors to update guid sum. 331 */ 332 for (; pvd != NULL; pvd = pvd->vdev_parent) 333 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 334} 335 336void 337vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 338{ 339 int c; 340 uint_t id = cvd->vdev_id; 341 342 ASSERT(cvd->vdev_parent == pvd); 343 344 if (pvd == NULL) 345 return; 346 347 ASSERT(id < pvd->vdev_children); 348 ASSERT(pvd->vdev_child[id] == cvd); 349 350 pvd->vdev_child[id] = NULL; 351 cvd->vdev_parent = NULL; 352 353 for (c = 0; c < pvd->vdev_children; c++) 354 if (pvd->vdev_child[c]) 355 break; 356 357 if (c == pvd->vdev_children) { 358 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 359 pvd->vdev_child = NULL; 360 pvd->vdev_children = 0; 361 } 362 363 /* 364 * Walk up all ancestors to update guid sum. 365 */ 366 for (; pvd != NULL; pvd = pvd->vdev_parent) 367 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 368} 369 370/* 371 * Remove any holes in the child array. 372 */ 373void 374vdev_compact_children(vdev_t *pvd) 375{ 376 vdev_t **newchild, *cvd; 377 int oldc = pvd->vdev_children; 378 int newc; 379 380 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 381 382 for (int c = newc = 0; c < oldc; c++) 383 if (pvd->vdev_child[c]) 384 newc++; 385 386 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 387 388 for (int c = newc = 0; c < oldc; c++) { 389 if ((cvd = pvd->vdev_child[c]) != NULL) { 390 newchild[newc] = cvd; 391 cvd->vdev_id = newc++; 392 } 393 } 394 395 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 396 pvd->vdev_child = newchild; 397 pvd->vdev_children = newc; 398} 399 400/* 401 * Allocate and minimally initialize a vdev_t. 402 */ 403vdev_t * 404vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 405{ 406 vdev_t *vd; 407 408 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 409 410 if (spa->spa_root_vdev == NULL) { 411 ASSERT(ops == &vdev_root_ops); 412 spa->spa_root_vdev = vd; 413 spa->spa_load_guid = spa_generate_guid(NULL); 414 } 415 416 if (guid == 0 && ops != &vdev_hole_ops) { 417 if (spa->spa_root_vdev == vd) { 418 /* 419 * The root vdev's guid will also be the pool guid, 420 * which must be unique among all pools. 421 */ 422 guid = spa_generate_guid(NULL); 423 } else { 424 /* 425 * Any other vdev's guid must be unique within the pool. 426 */ 427 guid = spa_generate_guid(spa); 428 } 429 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 430 } 431 432 vd->vdev_spa = spa; 433 vd->vdev_id = id; 434 vd->vdev_guid = guid; 435 vd->vdev_guid_sum = guid; 436 vd->vdev_ops = ops; 437 vd->vdev_state = VDEV_STATE_CLOSED; 438 vd->vdev_ishole = (ops == &vdev_hole_ops); 439 440 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 441 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 442 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 443 for (int t = 0; t < DTL_TYPES; t++) { 444 vd->vdev_dtl[t] = range_tree_create(NULL, NULL, 445 &vd->vdev_dtl_lock); 446 } 447 txg_list_create(&vd->vdev_ms_list, 448 offsetof(struct metaslab, ms_txg_node)); 449 txg_list_create(&vd->vdev_dtl_list, 450 offsetof(struct vdev, vdev_dtl_node)); 451 vd->vdev_stat.vs_timestamp = gethrtime(); 452 vdev_queue_init(vd); 453 vdev_cache_init(vd); 454 455 return (vd); 456} 457 458/* 459 * Allocate a new vdev. The 'alloctype' is used to control whether we are 460 * creating a new vdev or loading an existing one - the behavior is slightly 461 * different for each case. 462 */ 463int 464vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 465 int alloctype) 466{ 467 vdev_ops_t *ops; 468 char *type; 469 uint64_t guid = 0, islog, nparity; 470 vdev_t *vd; 471 472 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 473 474 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 475 return (SET_ERROR(EINVAL)); 476 477 if ((ops = vdev_getops(type)) == NULL) 478 return (SET_ERROR(EINVAL)); 479 480 /* 481 * If this is a load, get the vdev guid from the nvlist. 482 * Otherwise, vdev_alloc_common() will generate one for us. 483 */ 484 if (alloctype == VDEV_ALLOC_LOAD) { 485 uint64_t label_id; 486 487 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 488 label_id != id) 489 return (SET_ERROR(EINVAL)); 490 491 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 492 return (SET_ERROR(EINVAL)); 493 } else if (alloctype == VDEV_ALLOC_SPARE) { 494 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 495 return (SET_ERROR(EINVAL)); 496 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 497 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 498 return (SET_ERROR(EINVAL)); 499 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 500 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 501 return (SET_ERROR(EINVAL)); 502 } 503 504 /* 505 * The first allocated vdev must be of type 'root'. 506 */ 507 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 508 return (SET_ERROR(EINVAL)); 509 510 /* 511 * Determine whether we're a log vdev. 512 */ 513 islog = 0; 514 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 515 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 516 return (SET_ERROR(ENOTSUP)); 517 518 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 519 return (SET_ERROR(ENOTSUP)); 520 521 /* 522 * Set the nparity property for RAID-Z vdevs. 523 */ 524 nparity = -1ULL; 525 if (ops == &vdev_raidz_ops) { 526 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 527 &nparity) == 0) { 528 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 529 return (SET_ERROR(EINVAL)); 530 /* 531 * Previous versions could only support 1 or 2 parity 532 * device. 533 */ 534 if (nparity > 1 && 535 spa_version(spa) < SPA_VERSION_RAIDZ2) 536 return (SET_ERROR(ENOTSUP)); 537 if (nparity > 2 && 538 spa_version(spa) < SPA_VERSION_RAIDZ3) 539 return (SET_ERROR(ENOTSUP)); 540 } else { 541 /* 542 * We require the parity to be specified for SPAs that 543 * support multiple parity levels. 544 */ 545 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 546 return (SET_ERROR(EINVAL)); 547 /* 548 * Otherwise, we default to 1 parity device for RAID-Z. 549 */ 550 nparity = 1; 551 } 552 } else { 553 nparity = 0; 554 } 555 ASSERT(nparity != -1ULL); 556 557 vd = vdev_alloc_common(spa, id, guid, ops); 558 559 vd->vdev_islog = islog; 560 vd->vdev_nparity = nparity; 561 562 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 563 vd->vdev_path = spa_strdup(vd->vdev_path); 564 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 565 vd->vdev_devid = spa_strdup(vd->vdev_devid); 566 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 567 &vd->vdev_physpath) == 0) 568 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 569 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 570 vd->vdev_fru = spa_strdup(vd->vdev_fru); 571 572 /* 573 * Set the whole_disk property. If it's not specified, leave the value 574 * as -1. 575 */ 576 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 577 &vd->vdev_wholedisk) != 0) 578 vd->vdev_wholedisk = -1ULL; 579 580 /* 581 * Look for the 'not present' flag. This will only be set if the device 582 * was not present at the time of import. 583 */ 584 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 585 &vd->vdev_not_present); 586 587 /* 588 * Get the alignment requirement. 589 */ 590 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 591 592 /* 593 * Retrieve the vdev creation time. 594 */ 595 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 596 &vd->vdev_crtxg); 597 598 /* 599 * If we're a top-level vdev, try to load the allocation parameters. 600 */ 601 if (parent && !parent->vdev_parent && 602 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 603 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 604 &vd->vdev_ms_array); 605 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 606 &vd->vdev_ms_shift); 607 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 608 &vd->vdev_asize); 609 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 610 &vd->vdev_removing); 611 } 612 613 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 614 ASSERT(alloctype == VDEV_ALLOC_LOAD || 615 alloctype == VDEV_ALLOC_ADD || 616 alloctype == VDEV_ALLOC_SPLIT || 617 alloctype == VDEV_ALLOC_ROOTPOOL); 618 vd->vdev_mg = metaslab_group_create(islog ? 619 spa_log_class(spa) : spa_normal_class(spa), vd); 620 } 621 622 /* 623 * If we're a leaf vdev, try to load the DTL object and other state. 624 */ 625 if (vd->vdev_ops->vdev_op_leaf && 626 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 627 alloctype == VDEV_ALLOC_ROOTPOOL)) { 628 if (alloctype == VDEV_ALLOC_LOAD) { 629 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 630 &vd->vdev_dtl_object); 631 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 632 &vd->vdev_unspare); 633 } 634 635 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 636 uint64_t spare = 0; 637 638 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 639 &spare) == 0 && spare) 640 spa_spare_add(vd); 641 } 642 643 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 644 &vd->vdev_offline); 645 646 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 647 &vd->vdev_resilver_txg); 648 649 /* 650 * When importing a pool, we want to ignore the persistent fault 651 * state, as the diagnosis made on another system may not be 652 * valid in the current context. Local vdevs will 653 * remain in the faulted state. 654 */ 655 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 656 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 657 &vd->vdev_faulted); 658 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 659 &vd->vdev_degraded); 660 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 661 &vd->vdev_removed); 662 663 if (vd->vdev_faulted || vd->vdev_degraded) { 664 char *aux; 665 666 vd->vdev_label_aux = 667 VDEV_AUX_ERR_EXCEEDED; 668 if (nvlist_lookup_string(nv, 669 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 670 strcmp(aux, "external") == 0) 671 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 672 } 673 } 674 } 675 676 /* 677 * Add ourselves to the parent's list of children. 678 */ 679 vdev_add_child(parent, vd); 680 681 *vdp = vd; 682 683 return (0); 684} 685 686void 687vdev_free(vdev_t *vd) 688{ 689 spa_t *spa = vd->vdev_spa; 690 691 /* 692 * vdev_free() implies closing the vdev first. This is simpler than 693 * trying to ensure complicated semantics for all callers. 694 */ 695 vdev_close(vd); 696 697 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 698 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 699 700 /* 701 * Free all children. 702 */ 703 for (int c = 0; c < vd->vdev_children; c++) 704 vdev_free(vd->vdev_child[c]); 705 706 ASSERT(vd->vdev_child == NULL); 707 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 708 709 /* 710 * Discard allocation state. 711 */ 712 if (vd->vdev_mg != NULL) { 713 vdev_metaslab_fini(vd); 714 metaslab_group_destroy(vd->vdev_mg); 715 } 716 717 ASSERT0(vd->vdev_stat.vs_space); 718 ASSERT0(vd->vdev_stat.vs_dspace); 719 ASSERT0(vd->vdev_stat.vs_alloc); 720 721 /* 722 * Remove this vdev from its parent's child list. 723 */ 724 vdev_remove_child(vd->vdev_parent, vd); 725 726 ASSERT(vd->vdev_parent == NULL); 727 728 /* 729 * Clean up vdev structure. 730 */ 731 vdev_queue_fini(vd); 732 vdev_cache_fini(vd); 733 734 if (vd->vdev_path) 735 spa_strfree(vd->vdev_path); 736 if (vd->vdev_devid) 737 spa_strfree(vd->vdev_devid); 738 if (vd->vdev_physpath) 739 spa_strfree(vd->vdev_physpath); 740 if (vd->vdev_fru) 741 spa_strfree(vd->vdev_fru); 742 743 if (vd->vdev_isspare) 744 spa_spare_remove(vd); 745 if (vd->vdev_isl2cache) 746 spa_l2cache_remove(vd); 747 748 txg_list_destroy(&vd->vdev_ms_list); 749 txg_list_destroy(&vd->vdev_dtl_list); 750 751 mutex_enter(&vd->vdev_dtl_lock); 752 space_map_close(vd->vdev_dtl_sm); 753 for (int t = 0; t < DTL_TYPES; t++) { 754 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 755 range_tree_destroy(vd->vdev_dtl[t]); 756 } 757 mutex_exit(&vd->vdev_dtl_lock); 758 759 mutex_destroy(&vd->vdev_dtl_lock); 760 mutex_destroy(&vd->vdev_stat_lock); 761 mutex_destroy(&vd->vdev_probe_lock); 762 763 if (vd == spa->spa_root_vdev) 764 spa->spa_root_vdev = NULL; 765 766 kmem_free(vd, sizeof (vdev_t)); 767} 768 769/* 770 * Transfer top-level vdev state from svd to tvd. 771 */ 772static void 773vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 774{ 775 spa_t *spa = svd->vdev_spa; 776 metaslab_t *msp; 777 vdev_t *vd; 778 int t; 779 780 ASSERT(tvd == tvd->vdev_top); 781 782 tvd->vdev_ms_array = svd->vdev_ms_array; 783 tvd->vdev_ms_shift = svd->vdev_ms_shift; 784 tvd->vdev_ms_count = svd->vdev_ms_count; 785 786 svd->vdev_ms_array = 0; 787 svd->vdev_ms_shift = 0; 788 svd->vdev_ms_count = 0; 789 790 if (tvd->vdev_mg) 791 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 792 tvd->vdev_mg = svd->vdev_mg; 793 tvd->vdev_ms = svd->vdev_ms; 794 795 svd->vdev_mg = NULL; 796 svd->vdev_ms = NULL; 797 798 if (tvd->vdev_mg != NULL) 799 tvd->vdev_mg->mg_vd = tvd; 800 801 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 802 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 803 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 804 805 svd->vdev_stat.vs_alloc = 0; 806 svd->vdev_stat.vs_space = 0; 807 svd->vdev_stat.vs_dspace = 0; 808 809 for (t = 0; t < TXG_SIZE; t++) { 810 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 811 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 812 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 813 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 814 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 815 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 816 } 817 818 if (list_link_active(&svd->vdev_config_dirty_node)) { 819 vdev_config_clean(svd); 820 vdev_config_dirty(tvd); 821 } 822 823 if (list_link_active(&svd->vdev_state_dirty_node)) { 824 vdev_state_clean(svd); 825 vdev_state_dirty(tvd); 826 } 827 828 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 829 svd->vdev_deflate_ratio = 0; 830 831 tvd->vdev_islog = svd->vdev_islog; 832 svd->vdev_islog = 0; 833} 834 835static void 836vdev_top_update(vdev_t *tvd, vdev_t *vd) 837{ 838 if (vd == NULL) 839 return; 840 841 vd->vdev_top = tvd; 842 843 for (int c = 0; c < vd->vdev_children; c++) 844 vdev_top_update(tvd, vd->vdev_child[c]); 845} 846 847/* 848 * Add a mirror/replacing vdev above an existing vdev. 849 */ 850vdev_t * 851vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 852{ 853 spa_t *spa = cvd->vdev_spa; 854 vdev_t *pvd = cvd->vdev_parent; 855 vdev_t *mvd; 856 857 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 858 859 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 860 861 mvd->vdev_asize = cvd->vdev_asize; 862 mvd->vdev_min_asize = cvd->vdev_min_asize; 863 mvd->vdev_max_asize = cvd->vdev_max_asize; 864 mvd->vdev_ashift = cvd->vdev_ashift; 865 mvd->vdev_logical_ashift = cvd->vdev_logical_ashift; 866 mvd->vdev_physical_ashift = cvd->vdev_physical_ashift; 867 mvd->vdev_state = cvd->vdev_state; 868 mvd->vdev_crtxg = cvd->vdev_crtxg; 869 870 vdev_remove_child(pvd, cvd); 871 vdev_add_child(pvd, mvd); 872 cvd->vdev_id = mvd->vdev_children; 873 vdev_add_child(mvd, cvd); 874 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 875 876 if (mvd == mvd->vdev_top) 877 vdev_top_transfer(cvd, mvd); 878 879 return (mvd); 880} 881 882/* 883 * Remove a 1-way mirror/replacing vdev from the tree. 884 */ 885void 886vdev_remove_parent(vdev_t *cvd) 887{ 888 vdev_t *mvd = cvd->vdev_parent; 889 vdev_t *pvd = mvd->vdev_parent; 890 891 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 892 893 ASSERT(mvd->vdev_children == 1); 894 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 895 mvd->vdev_ops == &vdev_replacing_ops || 896 mvd->vdev_ops == &vdev_spare_ops); 897 cvd->vdev_ashift = mvd->vdev_ashift; 898 cvd->vdev_logical_ashift = mvd->vdev_logical_ashift; 899 cvd->vdev_physical_ashift = mvd->vdev_physical_ashift; 900 901 vdev_remove_child(mvd, cvd); 902 vdev_remove_child(pvd, mvd); 903 904 /* 905 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 906 * Otherwise, we could have detached an offline device, and when we 907 * go to import the pool we'll think we have two top-level vdevs, 908 * instead of a different version of the same top-level vdev. 909 */ 910 if (mvd->vdev_top == mvd) { 911 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 912 cvd->vdev_orig_guid = cvd->vdev_guid; 913 cvd->vdev_guid += guid_delta; 914 cvd->vdev_guid_sum += guid_delta; 915 } 916 cvd->vdev_id = mvd->vdev_id; 917 vdev_add_child(pvd, cvd); 918 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 919 920 if (cvd == cvd->vdev_top) 921 vdev_top_transfer(mvd, cvd); 922 923 ASSERT(mvd->vdev_children == 0); 924 vdev_free(mvd); 925} 926 927int 928vdev_metaslab_init(vdev_t *vd, uint64_t txg) 929{ 930 spa_t *spa = vd->vdev_spa; 931 objset_t *mos = spa->spa_meta_objset; 932 uint64_t m; 933 uint64_t oldc = vd->vdev_ms_count; 934 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 935 metaslab_t **mspp; 936 int error; 937 938 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 939 940 /* 941 * This vdev is not being allocated from yet or is a hole. 942 */ 943 if (vd->vdev_ms_shift == 0) 944 return (0); 945 946 ASSERT(!vd->vdev_ishole); 947 948 /* 949 * Compute the raidz-deflation ratio. Note, we hard-code 950 * in 128k (1 << 17) because it is the "typical" blocksize. 951 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change, 952 * otherwise it would inconsistently account for existing bp's. 953 */ 954 vd->vdev_deflate_ratio = (1 << 17) / 955 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 956 957 ASSERT(oldc <= newc); 958 959 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 960 961 if (oldc != 0) { 962 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 963 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 964 } 965 966 vd->vdev_ms = mspp; 967 vd->vdev_ms_count = newc; 968 969 for (m = oldc; m < newc; m++) { 970 uint64_t object = 0; 971 972 if (txg == 0) { 973 error = dmu_read(mos, vd->vdev_ms_array, 974 m * sizeof (uint64_t), sizeof (uint64_t), &object, 975 DMU_READ_PREFETCH); 976 if (error) 977 return (error); 978 } 979 980 error = metaslab_init(vd->vdev_mg, m, object, txg, 981 &(vd->vdev_ms[m])); 982 if (error) 983 return (error); 984 } 985 986 if (txg == 0) 987 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 988 989 /* 990 * If the vdev is being removed we don't activate 991 * the metaslabs since we want to ensure that no new 992 * allocations are performed on this device. 993 */ 994 if (oldc == 0 && !vd->vdev_removing) 995 metaslab_group_activate(vd->vdev_mg); 996 997 if (txg == 0) 998 spa_config_exit(spa, SCL_ALLOC, FTAG); 999 1000 return (0); 1001} 1002 1003void 1004vdev_metaslab_fini(vdev_t *vd) 1005{ 1006 uint64_t m; 1007 uint64_t count = vd->vdev_ms_count; 1008 1009 if (vd->vdev_ms != NULL) { 1010 metaslab_group_passivate(vd->vdev_mg); 1011 for (m = 0; m < count; m++) { 1012 metaslab_t *msp = vd->vdev_ms[m]; 1013 1014 if (msp != NULL) 1015 metaslab_fini(msp); 1016 } 1017 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 1018 vd->vdev_ms = NULL; 1019 } 1020} 1021 1022typedef struct vdev_probe_stats { 1023 boolean_t vps_readable; 1024 boolean_t vps_writeable; 1025 int vps_flags; 1026} vdev_probe_stats_t; 1027 1028static void 1029vdev_probe_done(zio_t *zio) 1030{ 1031 spa_t *spa = zio->io_spa; 1032 vdev_t *vd = zio->io_vd; 1033 vdev_probe_stats_t *vps = zio->io_private; 1034 1035 ASSERT(vd->vdev_probe_zio != NULL); 1036 1037 if (zio->io_type == ZIO_TYPE_READ) { 1038 if (zio->io_error == 0) 1039 vps->vps_readable = 1; 1040 if (zio->io_error == 0 && spa_writeable(spa)) { 1041 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1042 zio->io_offset, zio->io_size, zio->io_data, 1043 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1044 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1045 } else { 1046 zio_buf_free(zio->io_data, zio->io_size); 1047 } 1048 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1049 if (zio->io_error == 0) 1050 vps->vps_writeable = 1; 1051 zio_buf_free(zio->io_data, zio->io_size); 1052 } else if (zio->io_type == ZIO_TYPE_NULL) { 1053 zio_t *pio; 1054 1055 vd->vdev_cant_read |= !vps->vps_readable; 1056 vd->vdev_cant_write |= !vps->vps_writeable; 1057 1058 if (vdev_readable(vd) && 1059 (vdev_writeable(vd) || !spa_writeable(spa))) { 1060 zio->io_error = 0; 1061 } else { 1062 ASSERT(zio->io_error != 0); 1063 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1064 spa, vd, NULL, 0, 0); 1065 zio->io_error = SET_ERROR(ENXIO); 1066 } 1067 1068 mutex_enter(&vd->vdev_probe_lock); 1069 ASSERT(vd->vdev_probe_zio == zio); 1070 vd->vdev_probe_zio = NULL; 1071 mutex_exit(&vd->vdev_probe_lock); 1072 1073 while ((pio = zio_walk_parents(zio)) != NULL) 1074 if (!vdev_accessible(vd, pio)) 1075 pio->io_error = SET_ERROR(ENXIO); 1076 1077 kmem_free(vps, sizeof (*vps)); 1078 } 1079} 1080 1081/* 1082 * Determine whether this device is accessible. 1083 * 1084 * Read and write to several known locations: the pad regions of each 1085 * vdev label but the first, which we leave alone in case it contains 1086 * a VTOC. 1087 */ 1088zio_t * 1089vdev_probe(vdev_t *vd, zio_t *zio) 1090{ 1091 spa_t *spa = vd->vdev_spa; 1092 vdev_probe_stats_t *vps = NULL; 1093 zio_t *pio; 1094 1095 ASSERT(vd->vdev_ops->vdev_op_leaf); 1096 1097 /* 1098 * Don't probe the probe. 1099 */ 1100 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1101 return (NULL); 1102 1103 /* 1104 * To prevent 'probe storms' when a device fails, we create 1105 * just one probe i/o at a time. All zios that want to probe 1106 * this vdev will become parents of the probe io. 1107 */ 1108 mutex_enter(&vd->vdev_probe_lock); 1109 1110 if ((pio = vd->vdev_probe_zio) == NULL) { 1111 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1112 1113 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1114 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1115 ZIO_FLAG_TRYHARD; 1116 1117 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1118 /* 1119 * vdev_cant_read and vdev_cant_write can only 1120 * transition from TRUE to FALSE when we have the 1121 * SCL_ZIO lock as writer; otherwise they can only 1122 * transition from FALSE to TRUE. This ensures that 1123 * any zio looking at these values can assume that 1124 * failures persist for the life of the I/O. That's 1125 * important because when a device has intermittent 1126 * connectivity problems, we want to ensure that 1127 * they're ascribed to the device (ENXIO) and not 1128 * the zio (EIO). 1129 * 1130 * Since we hold SCL_ZIO as writer here, clear both 1131 * values so the probe can reevaluate from first 1132 * principles. 1133 */ 1134 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1135 vd->vdev_cant_read = B_FALSE; 1136 vd->vdev_cant_write = B_FALSE; 1137 } 1138 1139 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1140 vdev_probe_done, vps, 1141 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1142 1143 /* 1144 * We can't change the vdev state in this context, so we 1145 * kick off an async task to do it on our behalf. 1146 */ 1147 if (zio != NULL) { 1148 vd->vdev_probe_wanted = B_TRUE; 1149 spa_async_request(spa, SPA_ASYNC_PROBE); 1150 } 1151 } 1152 1153 if (zio != NULL) 1154 zio_add_child(zio, pio); 1155 1156 mutex_exit(&vd->vdev_probe_lock); 1157 1158 if (vps == NULL) { 1159 ASSERT(zio != NULL); 1160 return (NULL); 1161 } 1162 1163 for (int l = 1; l < VDEV_LABELS; l++) { 1164 zio_nowait(zio_read_phys(pio, vd, 1165 vdev_label_offset(vd->vdev_psize, l, 1166 offsetof(vdev_label_t, vl_pad2)), 1167 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1168 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1169 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1170 } 1171 1172 if (zio == NULL) 1173 return (pio); 1174 1175 zio_nowait(pio); 1176 return (NULL); 1177} 1178 1179static void 1180vdev_open_child(void *arg) 1181{ 1182 vdev_t *vd = arg; 1183 1184 vd->vdev_open_thread = curthread; 1185 vd->vdev_open_error = vdev_open(vd); 1186 vd->vdev_open_thread = NULL; 1187} 1188 1189boolean_t 1190vdev_uses_zvols(vdev_t *vd) 1191{ 1192 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1193 strlen(ZVOL_DIR)) == 0) 1194 return (B_TRUE); 1195 for (int c = 0; c < vd->vdev_children; c++) 1196 if (vdev_uses_zvols(vd->vdev_child[c])) 1197 return (B_TRUE); 1198 return (B_FALSE); 1199} 1200 1201void 1202vdev_open_children(vdev_t *vd) 1203{ 1204 taskq_t *tq; 1205 int children = vd->vdev_children; 1206 1207 /* 1208 * in order to handle pools on top of zvols, do the opens 1209 * in a single thread so that the same thread holds the 1210 * spa_namespace_lock 1211 */ 1212 if (B_TRUE || vdev_uses_zvols(vd)) { 1213 for (int c = 0; c < children; c++) 1214 vd->vdev_child[c]->vdev_open_error = 1215 vdev_open(vd->vdev_child[c]); 1216 return; 1217 } 1218 tq = taskq_create("vdev_open", children, minclsyspri, 1219 children, children, TASKQ_PREPOPULATE); 1220 1221 for (int c = 0; c < children; c++) 1222 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1223 TQ_SLEEP) != 0); 1224 1225 taskq_destroy(tq); 1226} 1227 1228/* 1229 * Prepare a virtual device for access. 1230 */ 1231int 1232vdev_open(vdev_t *vd) 1233{ 1234 spa_t *spa = vd->vdev_spa; 1235 int error; 1236 uint64_t osize = 0; 1237 uint64_t max_osize = 0; 1238 uint64_t asize, max_asize, psize; 1239 uint64_t logical_ashift = 0; 1240 uint64_t physical_ashift = 0; 1241 1242 ASSERT(vd->vdev_open_thread == curthread || 1243 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1244 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1245 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1246 vd->vdev_state == VDEV_STATE_OFFLINE); 1247 1248 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1249 vd->vdev_cant_read = B_FALSE; 1250 vd->vdev_cant_write = B_FALSE; 1251 vd->vdev_notrim = B_FALSE; 1252 vd->vdev_min_asize = vdev_get_min_asize(vd); 1253 1254 /* 1255 * If this vdev is not removed, check its fault status. If it's 1256 * faulted, bail out of the open. 1257 */ 1258 if (!vd->vdev_removed && vd->vdev_faulted) { 1259 ASSERT(vd->vdev_children == 0); 1260 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1261 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1262 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1263 vd->vdev_label_aux); 1264 return (SET_ERROR(ENXIO)); 1265 } else if (vd->vdev_offline) { 1266 ASSERT(vd->vdev_children == 0); 1267 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1268 return (SET_ERROR(ENXIO)); 1269 } 1270 1271 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, 1272 &logical_ashift, &physical_ashift); 1273 1274 /* 1275 * Reset the vdev_reopening flag so that we actually close 1276 * the vdev on error. 1277 */ 1278 vd->vdev_reopening = B_FALSE; 1279 if (zio_injection_enabled && error == 0) 1280 error = zio_handle_device_injection(vd, NULL, ENXIO); 1281 1282 if (error) { 1283 if (vd->vdev_removed && 1284 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1285 vd->vdev_removed = B_FALSE; 1286 1287 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1288 vd->vdev_stat.vs_aux); 1289 return (error); 1290 } 1291 1292 vd->vdev_removed = B_FALSE; 1293 1294 /* 1295 * Recheck the faulted flag now that we have confirmed that 1296 * the vdev is accessible. If we're faulted, bail. 1297 */ 1298 if (vd->vdev_faulted) { 1299 ASSERT(vd->vdev_children == 0); 1300 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1301 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1302 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1303 vd->vdev_label_aux); 1304 return (SET_ERROR(ENXIO)); 1305 } 1306 1307 if (vd->vdev_degraded) { 1308 ASSERT(vd->vdev_children == 0); 1309 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1310 VDEV_AUX_ERR_EXCEEDED); 1311 } else { 1312 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1313 } 1314 1315 /* 1316 * For hole or missing vdevs we just return success. 1317 */ 1318 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1319 return (0); 1320 1321 if (zfs_trim_enabled && !vd->vdev_notrim && vd->vdev_ops->vdev_op_leaf) 1322 trim_map_create(vd); 1323 1324 for (int c = 0; c < vd->vdev_children; c++) { 1325 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1326 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1327 VDEV_AUX_NONE); 1328 break; 1329 } 1330 } 1331 1332 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1333 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1334 1335 if (vd->vdev_children == 0) { 1336 if (osize < SPA_MINDEVSIZE) { 1337 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1338 VDEV_AUX_TOO_SMALL); 1339 return (SET_ERROR(EOVERFLOW)); 1340 } 1341 psize = osize; 1342 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1343 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1344 VDEV_LABEL_END_SIZE); 1345 } else { 1346 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1347 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1348 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1349 VDEV_AUX_TOO_SMALL); 1350 return (SET_ERROR(EOVERFLOW)); 1351 } 1352 psize = 0; 1353 asize = osize; 1354 max_asize = max_osize; 1355 } 1356 1357 vd->vdev_psize = psize; 1358 1359 /* 1360 * Make sure the allocatable size hasn't shrunk. 1361 */ 1362 if (asize < vd->vdev_min_asize) { 1363 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1364 VDEV_AUX_BAD_LABEL); 1365 return (SET_ERROR(EINVAL)); 1366 } 1367 1368 vd->vdev_physical_ashift = 1369 MAX(physical_ashift, vd->vdev_physical_ashift); 1370 vd->vdev_logical_ashift = MAX(logical_ashift, vd->vdev_logical_ashift); 1371 vd->vdev_ashift = MAX(vd->vdev_logical_ashift, vd->vdev_ashift); 1372 1373 if (vd->vdev_logical_ashift > SPA_MAXASHIFT) { 1374 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1375 VDEV_AUX_ASHIFT_TOO_BIG); 1376 return (EINVAL); 1377 } 1378 1379 if (vd->vdev_asize == 0) { 1380 /* 1381 * This is the first-ever open, so use the computed values. 1382 * For testing purposes, a higher ashift can be requested. 1383 */ 1384 vd->vdev_asize = asize; 1385 vd->vdev_max_asize = max_asize; 1386 } else { 1387 /* 1388 * Make sure the alignment requirement hasn't increased. 1389 */ 1390 if (vd->vdev_ashift > vd->vdev_top->vdev_ashift && 1391 vd->vdev_ops->vdev_op_leaf) { 1392 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1393 VDEV_AUX_BAD_LABEL); 1394 return (EINVAL); 1395 } 1396 vd->vdev_max_asize = max_asize; 1397 } 1398 1399 /* 1400 * If all children are healthy and the asize has increased, 1401 * then we've experienced dynamic LUN growth. If automatic 1402 * expansion is enabled then use the additional space. 1403 */ 1404 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1405 (vd->vdev_expanding || spa->spa_autoexpand)) 1406 vd->vdev_asize = asize; 1407 1408 vdev_set_min_asize(vd); 1409 1410 /* 1411 * Ensure we can issue some IO before declaring the 1412 * vdev open for business. 1413 */ 1414 if (vd->vdev_ops->vdev_op_leaf && 1415 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1416 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1417 VDEV_AUX_ERR_EXCEEDED); 1418 return (error); 1419 } 1420 1421 /* 1422 * Track the min and max ashift values for normal data devices. 1423 */ 1424 if (vd->vdev_top == vd && vd->vdev_ashift != 0 && 1425 !vd->vdev_islog && vd->vdev_aux == NULL) { 1426 if (vd->vdev_ashift > spa->spa_max_ashift) 1427 spa->spa_max_ashift = vd->vdev_ashift; 1428 if (vd->vdev_ashift < spa->spa_min_ashift) 1429 spa->spa_min_ashift = vd->vdev_ashift; 1430 } 1431 1432 /* 1433 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1434 * resilver. But don't do this if we are doing a reopen for a scrub, 1435 * since this would just restart the scrub we are already doing. 1436 */ 1437 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1438 vdev_resilver_needed(vd, NULL, NULL)) 1439 spa_async_request(spa, SPA_ASYNC_RESILVER); 1440 1441 return (0); 1442} 1443 1444/* 1445 * Called once the vdevs are all opened, this routine validates the label 1446 * contents. This needs to be done before vdev_load() so that we don't 1447 * inadvertently do repair I/Os to the wrong device. 1448 * 1449 * If 'strict' is false ignore the spa guid check. This is necessary because 1450 * if the machine crashed during a re-guid the new guid might have been written 1451 * to all of the vdev labels, but not the cached config. The strict check 1452 * will be performed when the pool is opened again using the mos config. 1453 * 1454 * This function will only return failure if one of the vdevs indicates that it 1455 * has since been destroyed or exported. This is only possible if 1456 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1457 * will be updated but the function will return 0. 1458 */ 1459int 1460vdev_validate(vdev_t *vd, boolean_t strict) 1461{ 1462 spa_t *spa = vd->vdev_spa; 1463 nvlist_t *label; 1464 uint64_t guid = 0, top_guid; 1465 uint64_t state; 1466 1467 for (int c = 0; c < vd->vdev_children; c++) 1468 if (vdev_validate(vd->vdev_child[c], strict) != 0) 1469 return (SET_ERROR(EBADF)); 1470 1471 /* 1472 * If the device has already failed, or was marked offline, don't do 1473 * any further validation. Otherwise, label I/O will fail and we will 1474 * overwrite the previous state. 1475 */ 1476 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1477 uint64_t aux_guid = 0; 1478 nvlist_t *nvl; 1479 uint64_t txg = spa_last_synced_txg(spa) != 0 ? 1480 spa_last_synced_txg(spa) : -1ULL; 1481 1482 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1483 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1484 VDEV_AUX_BAD_LABEL); 1485 return (0); 1486 } 1487 1488 /* 1489 * Determine if this vdev has been split off into another 1490 * pool. If so, then refuse to open it. 1491 */ 1492 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1493 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1494 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1495 VDEV_AUX_SPLIT_POOL); 1496 nvlist_free(label); 1497 return (0); 1498 } 1499 1500 if (strict && (nvlist_lookup_uint64(label, 1501 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 || 1502 guid != spa_guid(spa))) { 1503 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1504 VDEV_AUX_CORRUPT_DATA); 1505 nvlist_free(label); 1506 return (0); 1507 } 1508 1509 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1510 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1511 &aux_guid) != 0) 1512 aux_guid = 0; 1513 1514 /* 1515 * If this vdev just became a top-level vdev because its 1516 * sibling was detached, it will have adopted the parent's 1517 * vdev guid -- but the label may or may not be on disk yet. 1518 * Fortunately, either version of the label will have the 1519 * same top guid, so if we're a top-level vdev, we can 1520 * safely compare to that instead. 1521 * 1522 * If we split this vdev off instead, then we also check the 1523 * original pool's guid. We don't want to consider the vdev 1524 * corrupt if it is partway through a split operation. 1525 */ 1526 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1527 &guid) != 0 || 1528 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1529 &top_guid) != 0 || 1530 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1531 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1532 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1533 VDEV_AUX_CORRUPT_DATA); 1534 nvlist_free(label); 1535 return (0); 1536 } 1537 1538 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1539 &state) != 0) { 1540 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1541 VDEV_AUX_CORRUPT_DATA); 1542 nvlist_free(label); 1543 return (0); 1544 } 1545 1546 nvlist_free(label); 1547 1548 /* 1549 * If this is a verbatim import, no need to check the 1550 * state of the pool. 1551 */ 1552 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1553 spa_load_state(spa) == SPA_LOAD_OPEN && 1554 state != POOL_STATE_ACTIVE) 1555 return (SET_ERROR(EBADF)); 1556 1557 /* 1558 * If we were able to open and validate a vdev that was 1559 * previously marked permanently unavailable, clear that state 1560 * now. 1561 */ 1562 if (vd->vdev_not_present) 1563 vd->vdev_not_present = 0; 1564 } 1565 1566 return (0); 1567} 1568 1569/* 1570 * Close a virtual device. 1571 */ 1572void 1573vdev_close(vdev_t *vd) 1574{ 1575 spa_t *spa = vd->vdev_spa; 1576 vdev_t *pvd = vd->vdev_parent; 1577 1578 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1579 1580 /* 1581 * If our parent is reopening, then we are as well, unless we are 1582 * going offline. 1583 */ 1584 if (pvd != NULL && pvd->vdev_reopening) 1585 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1586 1587 vd->vdev_ops->vdev_op_close(vd); 1588 1589 vdev_cache_purge(vd); 1590 1591 if (vd->vdev_ops->vdev_op_leaf) 1592 trim_map_destroy(vd); 1593 1594 /* 1595 * We record the previous state before we close it, so that if we are 1596 * doing a reopen(), we don't generate FMA ereports if we notice that 1597 * it's still faulted. 1598 */ 1599 vd->vdev_prevstate = vd->vdev_state; 1600 1601 if (vd->vdev_offline) 1602 vd->vdev_state = VDEV_STATE_OFFLINE; 1603 else 1604 vd->vdev_state = VDEV_STATE_CLOSED; 1605 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1606} 1607 1608void 1609vdev_hold(vdev_t *vd) 1610{ 1611 spa_t *spa = vd->vdev_spa; 1612 1613 ASSERT(spa_is_root(spa)); 1614 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1615 return; 1616 1617 for (int c = 0; c < vd->vdev_children; c++) 1618 vdev_hold(vd->vdev_child[c]); 1619 1620 if (vd->vdev_ops->vdev_op_leaf) 1621 vd->vdev_ops->vdev_op_hold(vd); 1622} 1623 1624void 1625vdev_rele(vdev_t *vd) 1626{ 1627 spa_t *spa = vd->vdev_spa; 1628 1629 ASSERT(spa_is_root(spa)); 1630 for (int c = 0; c < vd->vdev_children; c++) 1631 vdev_rele(vd->vdev_child[c]); 1632 1633 if (vd->vdev_ops->vdev_op_leaf) 1634 vd->vdev_ops->vdev_op_rele(vd); 1635} 1636 1637/* 1638 * Reopen all interior vdevs and any unopened leaves. We don't actually 1639 * reopen leaf vdevs which had previously been opened as they might deadlock 1640 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1641 * If the leaf has never been opened then open it, as usual. 1642 */ 1643void 1644vdev_reopen(vdev_t *vd) 1645{ 1646 spa_t *spa = vd->vdev_spa; 1647 1648 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1649 1650 /* set the reopening flag unless we're taking the vdev offline */ 1651 vd->vdev_reopening = !vd->vdev_offline; 1652 vdev_close(vd); 1653 (void) vdev_open(vd); 1654 1655 /* 1656 * Call vdev_validate() here to make sure we have the same device. 1657 * Otherwise, a device with an invalid label could be successfully 1658 * opened in response to vdev_reopen(). 1659 */ 1660 if (vd->vdev_aux) { 1661 (void) vdev_validate_aux(vd); 1662 if (vdev_readable(vd) && vdev_writeable(vd) && 1663 vd->vdev_aux == &spa->spa_l2cache && 1664 !l2arc_vdev_present(vd)) 1665 l2arc_add_vdev(spa, vd); 1666 } else { 1667 (void) vdev_validate(vd, B_TRUE); 1668 } 1669 1670 /* 1671 * Reassess parent vdev's health. 1672 */ 1673 vdev_propagate_state(vd); 1674} 1675 1676int 1677vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1678{ 1679 int error; 1680 1681 /* 1682 * Normally, partial opens (e.g. of a mirror) are allowed. 1683 * For a create, however, we want to fail the request if 1684 * there are any components we can't open. 1685 */ 1686 error = vdev_open(vd); 1687 1688 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1689 vdev_close(vd); 1690 return (error ? error : ENXIO); 1691 } 1692 1693 /* 1694 * Recursively load DTLs and initialize all labels. 1695 */ 1696 if ((error = vdev_dtl_load(vd)) != 0 || 1697 (error = vdev_label_init(vd, txg, isreplacing ? 1698 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1699 vdev_close(vd); 1700 return (error); 1701 } 1702 1703 return (0); 1704} 1705 1706void 1707vdev_metaslab_set_size(vdev_t *vd) 1708{ 1709 /* 1710 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev. 1711 */ 1712 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev); 1713 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1714} 1715 1716/* 1717 * Maximize performance by inflating the configured ashift for top level 1718 * vdevs to be as close to the physical ashift as possible while maintaining 1719 * administrator defined limits and ensuring it doesn't go below the 1720 * logical ashift. 1721 */ 1722void 1723vdev_ashift_optimize(vdev_t *vd) 1724{ 1725 if (vd == vd->vdev_top) { 1726 if (vd->vdev_ashift < vd->vdev_physical_ashift) { 1727 vd->vdev_ashift = MIN( 1728 MAX(zfs_max_auto_ashift, vd->vdev_ashift), 1729 MAX(zfs_min_auto_ashift, vd->vdev_physical_ashift)); 1730 } else { 1731 /* 1732 * Unusual case where logical ashift > physical ashift 1733 * so we can't cap the calculated ashift based on max 1734 * ashift as that would cause failures. 1735 * We still check if we need to increase it to match 1736 * the min ashift. 1737 */ 1738 vd->vdev_ashift = MAX(zfs_min_auto_ashift, 1739 vd->vdev_ashift); 1740 } 1741 } 1742} 1743 1744void 1745vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1746{ 1747 ASSERT(vd == vd->vdev_top); 1748 ASSERT(!vd->vdev_ishole); 1749 ASSERT(ISP2(flags)); 1750 ASSERT(spa_writeable(vd->vdev_spa)); 1751 1752 if (flags & VDD_METASLAB) 1753 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1754 1755 if (flags & VDD_DTL) 1756 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1757 1758 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1759} 1760 1761void 1762vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 1763{ 1764 for (int c = 0; c < vd->vdev_children; c++) 1765 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 1766 1767 if (vd->vdev_ops->vdev_op_leaf) 1768 vdev_dirty(vd->vdev_top, flags, vd, txg); 1769} 1770 1771/* 1772 * DTLs. 1773 * 1774 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1775 * the vdev has less than perfect replication. There are four kinds of DTL: 1776 * 1777 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1778 * 1779 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1780 * 1781 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1782 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1783 * txgs that was scrubbed. 1784 * 1785 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1786 * persistent errors or just some device being offline. 1787 * Unlike the other three, the DTL_OUTAGE map is not generally 1788 * maintained; it's only computed when needed, typically to 1789 * determine whether a device can be detached. 1790 * 1791 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1792 * either has the data or it doesn't. 1793 * 1794 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1795 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1796 * if any child is less than fully replicated, then so is its parent. 1797 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1798 * comprising only those txgs which appear in 'maxfaults' or more children; 1799 * those are the txgs we don't have enough replication to read. For example, 1800 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1801 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1802 * two child DTL_MISSING maps. 1803 * 1804 * It should be clear from the above that to compute the DTLs and outage maps 1805 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1806 * Therefore, that is all we keep on disk. When loading the pool, or after 1807 * a configuration change, we generate all other DTLs from first principles. 1808 */ 1809void 1810vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1811{ 1812 range_tree_t *rt = vd->vdev_dtl[t]; 1813 1814 ASSERT(t < DTL_TYPES); 1815 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1816 ASSERT(spa_writeable(vd->vdev_spa)); 1817 1818 mutex_enter(rt->rt_lock); 1819 if (!range_tree_contains(rt, txg, size)) 1820 range_tree_add(rt, txg, size); 1821 mutex_exit(rt->rt_lock); 1822} 1823 1824boolean_t 1825vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1826{ 1827 range_tree_t *rt = vd->vdev_dtl[t]; 1828 boolean_t dirty = B_FALSE; 1829 1830 ASSERT(t < DTL_TYPES); 1831 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1832 1833 mutex_enter(rt->rt_lock); 1834 if (range_tree_space(rt) != 0) 1835 dirty = range_tree_contains(rt, txg, size); 1836 mutex_exit(rt->rt_lock); 1837 1838 return (dirty); 1839} 1840 1841boolean_t 1842vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1843{ 1844 range_tree_t *rt = vd->vdev_dtl[t]; 1845 boolean_t empty; 1846 1847 mutex_enter(rt->rt_lock); 1848 empty = (range_tree_space(rt) == 0); 1849 mutex_exit(rt->rt_lock); 1850 1851 return (empty); 1852} 1853 1854/* 1855 * Returns the lowest txg in the DTL range. 1856 */ 1857static uint64_t 1858vdev_dtl_min(vdev_t *vd) 1859{ 1860 range_seg_t *rs; 1861 1862 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1863 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1864 ASSERT0(vd->vdev_children); 1865 1866 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1867 return (rs->rs_start - 1); 1868} 1869 1870/* 1871 * Returns the highest txg in the DTL. 1872 */ 1873static uint64_t 1874vdev_dtl_max(vdev_t *vd) 1875{ 1876 range_seg_t *rs; 1877 1878 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 1879 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 1880 ASSERT0(vd->vdev_children); 1881 1882 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 1883 return (rs->rs_end); 1884} 1885 1886/* 1887 * Determine if a resilvering vdev should remove any DTL entries from 1888 * its range. If the vdev was resilvering for the entire duration of the 1889 * scan then it should excise that range from its DTLs. Otherwise, this 1890 * vdev is considered partially resilvered and should leave its DTL 1891 * entries intact. The comment in vdev_dtl_reassess() describes how we 1892 * excise the DTLs. 1893 */ 1894static boolean_t 1895vdev_dtl_should_excise(vdev_t *vd) 1896{ 1897 spa_t *spa = vd->vdev_spa; 1898 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1899 1900 ASSERT0(scn->scn_phys.scn_errors); 1901 ASSERT0(vd->vdev_children); 1902 1903 if (vd->vdev_resilver_txg == 0 || 1904 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0) 1905 return (B_TRUE); 1906 1907 /* 1908 * When a resilver is initiated the scan will assign the scn_max_txg 1909 * value to the highest txg value that exists in all DTLs. If this 1910 * device's max DTL is not part of this scan (i.e. it is not in 1911 * the range (scn_min_txg, scn_max_txg] then it is not eligible 1912 * for excision. 1913 */ 1914 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 1915 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 1916 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 1917 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 1918 return (B_TRUE); 1919 } 1920 return (B_FALSE); 1921} 1922 1923/* 1924 * Reassess DTLs after a config change or scrub completion. 1925 */ 1926void 1927vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1928{ 1929 spa_t *spa = vd->vdev_spa; 1930 avl_tree_t reftree; 1931 int minref; 1932 1933 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1934 1935 for (int c = 0; c < vd->vdev_children; c++) 1936 vdev_dtl_reassess(vd->vdev_child[c], txg, 1937 scrub_txg, scrub_done); 1938 1939 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1940 return; 1941 1942 if (vd->vdev_ops->vdev_op_leaf) { 1943 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1944 1945 mutex_enter(&vd->vdev_dtl_lock); 1946 1947 /* 1948 * If we've completed a scan cleanly then determine 1949 * if this vdev should remove any DTLs. We only want to 1950 * excise regions on vdevs that were available during 1951 * the entire duration of this scan. 1952 */ 1953 if (scrub_txg != 0 && 1954 (spa->spa_scrub_started || 1955 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 1956 vdev_dtl_should_excise(vd)) { 1957 /* 1958 * We completed a scrub up to scrub_txg. If we 1959 * did it without rebooting, then the scrub dtl 1960 * will be valid, so excise the old region and 1961 * fold in the scrub dtl. Otherwise, leave the 1962 * dtl as-is if there was an error. 1963 * 1964 * There's little trick here: to excise the beginning 1965 * of the DTL_MISSING map, we put it into a reference 1966 * tree and then add a segment with refcnt -1 that 1967 * covers the range [0, scrub_txg). This means 1968 * that each txg in that range has refcnt -1 or 0. 1969 * We then add DTL_SCRUB with a refcnt of 2, so that 1970 * entries in the range [0, scrub_txg) will have a 1971 * positive refcnt -- either 1 or 2. We then convert 1972 * the reference tree into the new DTL_MISSING map. 1973 */ 1974 space_reftree_create(&reftree); 1975 space_reftree_add_map(&reftree, 1976 vd->vdev_dtl[DTL_MISSING], 1); 1977 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 1978 space_reftree_add_map(&reftree, 1979 vd->vdev_dtl[DTL_SCRUB], 2); 1980 space_reftree_generate_map(&reftree, 1981 vd->vdev_dtl[DTL_MISSING], 1); 1982 space_reftree_destroy(&reftree); 1983 } 1984 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1985 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1986 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 1987 if (scrub_done) 1988 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1989 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1990 if (!vdev_readable(vd)) 1991 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1992 else 1993 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 1994 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 1995 1996 /* 1997 * If the vdev was resilvering and no longer has any 1998 * DTLs then reset its resilvering flag and dirty 1999 * the top level so that we persist the change. 2000 */ 2001 if (vd->vdev_resilver_txg != 0 && 2002 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 && 2003 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0) { 2004 vd->vdev_resilver_txg = 0; 2005 vdev_config_dirty(vd->vdev_top); 2006 } 2007 2008 mutex_exit(&vd->vdev_dtl_lock); 2009 2010 if (txg != 0) 2011 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 2012 return; 2013 } 2014 2015 mutex_enter(&vd->vdev_dtl_lock); 2016 for (int t = 0; t < DTL_TYPES; t++) { 2017 /* account for child's outage in parent's missing map */ 2018 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 2019 if (t == DTL_SCRUB) 2020 continue; /* leaf vdevs only */ 2021 if (t == DTL_PARTIAL) 2022 minref = 1; /* i.e. non-zero */ 2023 else if (vd->vdev_nparity != 0) 2024 minref = vd->vdev_nparity + 1; /* RAID-Z */ 2025 else 2026 minref = vd->vdev_children; /* any kind of mirror */ 2027 space_reftree_create(&reftree); 2028 for (int c = 0; c < vd->vdev_children; c++) { 2029 vdev_t *cvd = vd->vdev_child[c]; 2030 mutex_enter(&cvd->vdev_dtl_lock); 2031 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 2032 mutex_exit(&cvd->vdev_dtl_lock); 2033 } 2034 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2035 space_reftree_destroy(&reftree); 2036 } 2037 mutex_exit(&vd->vdev_dtl_lock); 2038} 2039 2040int 2041vdev_dtl_load(vdev_t *vd) 2042{ 2043 spa_t *spa = vd->vdev_spa; 2044 objset_t *mos = spa->spa_meta_objset; 2045 int error = 0; 2046 2047 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2048 ASSERT(!vd->vdev_ishole); 2049 2050 error = space_map_open(&vd->vdev_dtl_sm, mos, 2051 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock); 2052 if (error) 2053 return (error); 2054 ASSERT(vd->vdev_dtl_sm != NULL); 2055 2056 mutex_enter(&vd->vdev_dtl_lock); 2057 2058 /* 2059 * Now that we've opened the space_map we need to update 2060 * the in-core DTL. 2061 */ 2062 space_map_update(vd->vdev_dtl_sm); 2063 2064 error = space_map_load(vd->vdev_dtl_sm, 2065 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2066 mutex_exit(&vd->vdev_dtl_lock); 2067 2068 return (error); 2069 } 2070 2071 for (int c = 0; c < vd->vdev_children; c++) { 2072 error = vdev_dtl_load(vd->vdev_child[c]); 2073 if (error != 0) 2074 break; 2075 } 2076 2077 return (error); 2078} 2079 2080void 2081vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2082{ 2083 spa_t *spa = vd->vdev_spa; 2084 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2085 objset_t *mos = spa->spa_meta_objset; 2086 range_tree_t *rtsync; 2087 kmutex_t rtlock; 2088 dmu_tx_t *tx; 2089 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2090 2091 ASSERT(!vd->vdev_ishole); 2092 ASSERT(vd->vdev_ops->vdev_op_leaf); 2093 2094 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2095 2096 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2097 mutex_enter(&vd->vdev_dtl_lock); 2098 space_map_free(vd->vdev_dtl_sm, tx); 2099 space_map_close(vd->vdev_dtl_sm); 2100 vd->vdev_dtl_sm = NULL; 2101 mutex_exit(&vd->vdev_dtl_lock); 2102 dmu_tx_commit(tx); 2103 return; 2104 } 2105 2106 if (vd->vdev_dtl_sm == NULL) { 2107 uint64_t new_object; 2108 2109 new_object = space_map_alloc(mos, tx); 2110 VERIFY3U(new_object, !=, 0); 2111 2112 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2113 0, -1ULL, 0, &vd->vdev_dtl_lock)); 2114 ASSERT(vd->vdev_dtl_sm != NULL); 2115 } 2116 2117 bzero(&rtlock, sizeof(rtlock)); 2118 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL); 2119 2120 rtsync = range_tree_create(NULL, NULL, &rtlock); 2121 2122 mutex_enter(&rtlock); 2123 2124 mutex_enter(&vd->vdev_dtl_lock); 2125 range_tree_walk(rt, range_tree_add, rtsync); 2126 mutex_exit(&vd->vdev_dtl_lock); 2127 2128 space_map_truncate(vd->vdev_dtl_sm, tx); 2129 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx); 2130 range_tree_vacate(rtsync, NULL, NULL); 2131 2132 range_tree_destroy(rtsync); 2133 2134 mutex_exit(&rtlock); 2135 mutex_destroy(&rtlock); 2136 2137 /* 2138 * If the object for the space map has changed then dirty 2139 * the top level so that we update the config. 2140 */ 2141 if (object != space_map_object(vd->vdev_dtl_sm)) { 2142 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, " 2143 "new object %llu", txg, spa_name(spa), object, 2144 space_map_object(vd->vdev_dtl_sm)); 2145 vdev_config_dirty(vd->vdev_top); 2146 } 2147 2148 dmu_tx_commit(tx); 2149 2150 mutex_enter(&vd->vdev_dtl_lock); 2151 space_map_update(vd->vdev_dtl_sm); 2152 mutex_exit(&vd->vdev_dtl_lock); 2153} 2154 2155/* 2156 * Determine whether the specified vdev can be offlined/detached/removed 2157 * without losing data. 2158 */ 2159boolean_t 2160vdev_dtl_required(vdev_t *vd) 2161{ 2162 spa_t *spa = vd->vdev_spa; 2163 vdev_t *tvd = vd->vdev_top; 2164 uint8_t cant_read = vd->vdev_cant_read; 2165 boolean_t required; 2166 2167 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2168 2169 if (vd == spa->spa_root_vdev || vd == tvd) 2170 return (B_TRUE); 2171 2172 /* 2173 * Temporarily mark the device as unreadable, and then determine 2174 * whether this results in any DTL outages in the top-level vdev. 2175 * If not, we can safely offline/detach/remove the device. 2176 */ 2177 vd->vdev_cant_read = B_TRUE; 2178 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2179 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2180 vd->vdev_cant_read = cant_read; 2181 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2182 2183 if (!required && zio_injection_enabled) 2184 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2185 2186 return (required); 2187} 2188 2189/* 2190 * Determine if resilver is needed, and if so the txg range. 2191 */ 2192boolean_t 2193vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2194{ 2195 boolean_t needed = B_FALSE; 2196 uint64_t thismin = UINT64_MAX; 2197 uint64_t thismax = 0; 2198 2199 if (vd->vdev_children == 0) { 2200 mutex_enter(&vd->vdev_dtl_lock); 2201 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 && 2202 vdev_writeable(vd)) { 2203 2204 thismin = vdev_dtl_min(vd); 2205 thismax = vdev_dtl_max(vd); 2206 needed = B_TRUE; 2207 } 2208 mutex_exit(&vd->vdev_dtl_lock); 2209 } else { 2210 for (int c = 0; c < vd->vdev_children; c++) { 2211 vdev_t *cvd = vd->vdev_child[c]; 2212 uint64_t cmin, cmax; 2213 2214 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2215 thismin = MIN(thismin, cmin); 2216 thismax = MAX(thismax, cmax); 2217 needed = B_TRUE; 2218 } 2219 } 2220 } 2221 2222 if (needed && minp) { 2223 *minp = thismin; 2224 *maxp = thismax; 2225 } 2226 return (needed); 2227} 2228 2229void 2230vdev_load(vdev_t *vd) 2231{ 2232 /* 2233 * Recursively load all children. 2234 */ 2235 for (int c = 0; c < vd->vdev_children; c++) 2236 vdev_load(vd->vdev_child[c]); 2237 2238 /* 2239 * If this is a top-level vdev, initialize its metaslabs. 2240 */ 2241 if (vd == vd->vdev_top && !vd->vdev_ishole && 2242 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 2243 vdev_metaslab_init(vd, 0) != 0)) 2244 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2245 VDEV_AUX_CORRUPT_DATA); 2246 2247 /* 2248 * If this is a leaf vdev, load its DTL. 2249 */ 2250 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 2251 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2252 VDEV_AUX_CORRUPT_DATA); 2253} 2254 2255/* 2256 * The special vdev case is used for hot spares and l2cache devices. Its 2257 * sole purpose it to set the vdev state for the associated vdev. To do this, 2258 * we make sure that we can open the underlying device, then try to read the 2259 * label, and make sure that the label is sane and that it hasn't been 2260 * repurposed to another pool. 2261 */ 2262int 2263vdev_validate_aux(vdev_t *vd) 2264{ 2265 nvlist_t *label; 2266 uint64_t guid, version; 2267 uint64_t state; 2268 2269 if (!vdev_readable(vd)) 2270 return (0); 2271 2272 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2273 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2274 VDEV_AUX_CORRUPT_DATA); 2275 return (-1); 2276 } 2277 2278 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2279 !SPA_VERSION_IS_SUPPORTED(version) || 2280 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2281 guid != vd->vdev_guid || 2282 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2283 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2284 VDEV_AUX_CORRUPT_DATA); 2285 nvlist_free(label); 2286 return (-1); 2287 } 2288 2289 /* 2290 * We don't actually check the pool state here. If it's in fact in 2291 * use by another pool, we update this fact on the fly when requested. 2292 */ 2293 nvlist_free(label); 2294 return (0); 2295} 2296 2297void 2298vdev_remove(vdev_t *vd, uint64_t txg) 2299{ 2300 spa_t *spa = vd->vdev_spa; 2301 objset_t *mos = spa->spa_meta_objset; 2302 dmu_tx_t *tx; 2303 2304 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2305 2306 if (vd->vdev_ms != NULL) { 2307 metaslab_group_t *mg = vd->vdev_mg; 2308 2309 metaslab_group_histogram_verify(mg); 2310 metaslab_class_histogram_verify(mg->mg_class); 2311 2312 for (int m = 0; m < vd->vdev_ms_count; m++) { 2313 metaslab_t *msp = vd->vdev_ms[m]; 2314 2315 if (msp == NULL || msp->ms_sm == NULL) 2316 continue; 2317 2318 mutex_enter(&msp->ms_lock); 2319 /* 2320 * If the metaslab was not loaded when the vdev 2321 * was removed then the histogram accounting may 2322 * not be accurate. Update the histogram information 2323 * here so that we ensure that the metaslab group 2324 * and metaslab class are up-to-date. 2325 */ 2326 metaslab_group_histogram_remove(mg, msp); 2327 2328 VERIFY0(space_map_allocated(msp->ms_sm)); 2329 space_map_free(msp->ms_sm, tx); 2330 space_map_close(msp->ms_sm); 2331 msp->ms_sm = NULL; 2332 mutex_exit(&msp->ms_lock); 2333 } 2334 2335 metaslab_group_histogram_verify(mg); 2336 metaslab_class_histogram_verify(mg->mg_class); 2337 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 2338 ASSERT0(mg->mg_histogram[i]); 2339 2340 } 2341 2342 if (vd->vdev_ms_array) { 2343 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2344 vd->vdev_ms_array = 0; 2345 } 2346 dmu_tx_commit(tx); 2347} 2348 2349void 2350vdev_sync_done(vdev_t *vd, uint64_t txg) 2351{ 2352 metaslab_t *msp; 2353 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2354 2355 ASSERT(!vd->vdev_ishole); 2356 2357 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2358 metaslab_sync_done(msp, txg); 2359 2360 if (reassess) 2361 metaslab_sync_reassess(vd->vdev_mg); 2362} 2363 2364void 2365vdev_sync(vdev_t *vd, uint64_t txg) 2366{ 2367 spa_t *spa = vd->vdev_spa; 2368 vdev_t *lvd; 2369 metaslab_t *msp; 2370 dmu_tx_t *tx; 2371 2372 ASSERT(!vd->vdev_ishole); 2373 2374 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2375 ASSERT(vd == vd->vdev_top); 2376 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2377 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2378 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2379 ASSERT(vd->vdev_ms_array != 0); 2380 vdev_config_dirty(vd); 2381 dmu_tx_commit(tx); 2382 } 2383 2384 /* 2385 * Remove the metadata associated with this vdev once it's empty. 2386 */ 2387 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2388 vdev_remove(vd, txg); 2389 2390 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2391 metaslab_sync(msp, txg); 2392 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2393 } 2394 2395 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2396 vdev_dtl_sync(lvd, txg); 2397 2398 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2399} 2400 2401uint64_t 2402vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2403{ 2404 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2405} 2406 2407/* 2408 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2409 * not be opened, and no I/O is attempted. 2410 */ 2411int 2412vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2413{ 2414 vdev_t *vd, *tvd; 2415 2416 spa_vdev_state_enter(spa, SCL_NONE); 2417 2418 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2419 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2420 2421 if (!vd->vdev_ops->vdev_op_leaf) 2422 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2423 2424 tvd = vd->vdev_top; 2425 2426 /* 2427 * We don't directly use the aux state here, but if we do a 2428 * vdev_reopen(), we need this value to be present to remember why we 2429 * were faulted. 2430 */ 2431 vd->vdev_label_aux = aux; 2432 2433 /* 2434 * Faulted state takes precedence over degraded. 2435 */ 2436 vd->vdev_delayed_close = B_FALSE; 2437 vd->vdev_faulted = 1ULL; 2438 vd->vdev_degraded = 0ULL; 2439 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2440 2441 /* 2442 * If this device has the only valid copy of the data, then 2443 * back off and simply mark the vdev as degraded instead. 2444 */ 2445 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2446 vd->vdev_degraded = 1ULL; 2447 vd->vdev_faulted = 0ULL; 2448 2449 /* 2450 * If we reopen the device and it's not dead, only then do we 2451 * mark it degraded. 2452 */ 2453 vdev_reopen(tvd); 2454 2455 if (vdev_readable(vd)) 2456 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2457 } 2458 2459 return (spa_vdev_state_exit(spa, vd, 0)); 2460} 2461 2462/* 2463 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2464 * user that something is wrong. The vdev continues to operate as normal as far 2465 * as I/O is concerned. 2466 */ 2467int 2468vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2469{ 2470 vdev_t *vd; 2471 2472 spa_vdev_state_enter(spa, SCL_NONE); 2473 2474 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2475 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2476 2477 if (!vd->vdev_ops->vdev_op_leaf) 2478 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2479 2480 /* 2481 * If the vdev is already faulted, then don't do anything. 2482 */ 2483 if (vd->vdev_faulted || vd->vdev_degraded) 2484 return (spa_vdev_state_exit(spa, NULL, 0)); 2485 2486 vd->vdev_degraded = 1ULL; 2487 if (!vdev_is_dead(vd)) 2488 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2489 aux); 2490 2491 return (spa_vdev_state_exit(spa, vd, 0)); 2492} 2493 2494/* 2495 * Online the given vdev. 2496 * 2497 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 2498 * spare device should be detached when the device finishes resilvering. 2499 * Second, the online should be treated like a 'test' online case, so no FMA 2500 * events are generated if the device fails to open. 2501 */ 2502int 2503vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2504{ 2505 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2506 boolean_t postevent = B_FALSE; 2507 2508 spa_vdev_state_enter(spa, SCL_NONE); 2509 2510 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2511 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2512 2513 if (!vd->vdev_ops->vdev_op_leaf) 2514 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2515 2516 postevent = 2517 (vd->vdev_offline == B_TRUE || vd->vdev_tmpoffline == B_TRUE) ? 2518 B_TRUE : B_FALSE; 2519 2520 tvd = vd->vdev_top; 2521 vd->vdev_offline = B_FALSE; 2522 vd->vdev_tmpoffline = B_FALSE; 2523 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2524 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2525 2526 /* XXX - L2ARC 1.0 does not support expansion */ 2527 if (!vd->vdev_aux) { 2528 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2529 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2530 } 2531 2532 vdev_reopen(tvd); 2533 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2534 2535 if (!vd->vdev_aux) { 2536 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2537 pvd->vdev_expanding = B_FALSE; 2538 } 2539 2540 if (newstate) 2541 *newstate = vd->vdev_state; 2542 if ((flags & ZFS_ONLINE_UNSPARE) && 2543 !vdev_is_dead(vd) && vd->vdev_parent && 2544 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2545 vd->vdev_parent->vdev_child[0] == vd) 2546 vd->vdev_unspare = B_TRUE; 2547 2548 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2549 2550 /* XXX - L2ARC 1.0 does not support expansion */ 2551 if (vd->vdev_aux) 2552 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2553 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2554 } 2555 2556 if (postevent) 2557 spa_event_notify(spa, vd, ESC_ZFS_VDEV_ONLINE); 2558 2559 return (spa_vdev_state_exit(spa, vd, 0)); 2560} 2561 2562static int 2563vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2564{ 2565 vdev_t *vd, *tvd; 2566 int error = 0; 2567 uint64_t generation; 2568 metaslab_group_t *mg; 2569 2570top: 2571 spa_vdev_state_enter(spa, SCL_ALLOC); 2572 2573 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2574 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2575 2576 if (!vd->vdev_ops->vdev_op_leaf) 2577 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2578 2579 tvd = vd->vdev_top; 2580 mg = tvd->vdev_mg; 2581 generation = spa->spa_config_generation + 1; 2582 2583 /* 2584 * If the device isn't already offline, try to offline it. 2585 */ 2586 if (!vd->vdev_offline) { 2587 /* 2588 * If this device has the only valid copy of some data, 2589 * don't allow it to be offlined. Log devices are always 2590 * expendable. 2591 */ 2592 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2593 vdev_dtl_required(vd)) 2594 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2595 2596 /* 2597 * If the top-level is a slog and it has had allocations 2598 * then proceed. We check that the vdev's metaslab group 2599 * is not NULL since it's possible that we may have just 2600 * added this vdev but not yet initialized its metaslabs. 2601 */ 2602 if (tvd->vdev_islog && mg != NULL) { 2603 /* 2604 * Prevent any future allocations. 2605 */ 2606 metaslab_group_passivate(mg); 2607 (void) spa_vdev_state_exit(spa, vd, 0); 2608 2609 error = spa_offline_log(spa); 2610 2611 spa_vdev_state_enter(spa, SCL_ALLOC); 2612 2613 /* 2614 * Check to see if the config has changed. 2615 */ 2616 if (error || generation != spa->spa_config_generation) { 2617 metaslab_group_activate(mg); 2618 if (error) 2619 return (spa_vdev_state_exit(spa, 2620 vd, error)); 2621 (void) spa_vdev_state_exit(spa, vd, 0); 2622 goto top; 2623 } 2624 ASSERT0(tvd->vdev_stat.vs_alloc); 2625 } 2626 2627 /* 2628 * Offline this device and reopen its top-level vdev. 2629 * If the top-level vdev is a log device then just offline 2630 * it. Otherwise, if this action results in the top-level 2631 * vdev becoming unusable, undo it and fail the request. 2632 */ 2633 vd->vdev_offline = B_TRUE; 2634 vdev_reopen(tvd); 2635 2636 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2637 vdev_is_dead(tvd)) { 2638 vd->vdev_offline = B_FALSE; 2639 vdev_reopen(tvd); 2640 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2641 } 2642 2643 /* 2644 * Add the device back into the metaslab rotor so that 2645 * once we online the device it's open for business. 2646 */ 2647 if (tvd->vdev_islog && mg != NULL) 2648 metaslab_group_activate(mg); 2649 } 2650 2651 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2652 2653 return (spa_vdev_state_exit(spa, vd, 0)); 2654} 2655 2656int 2657vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2658{ 2659 int error; 2660 2661 mutex_enter(&spa->spa_vdev_top_lock); 2662 error = vdev_offline_locked(spa, guid, flags); 2663 mutex_exit(&spa->spa_vdev_top_lock); 2664 2665 return (error); 2666} 2667 2668/* 2669 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2670 * vdev_offline(), we assume the spa config is locked. We also clear all 2671 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2672 */ 2673void 2674vdev_clear(spa_t *spa, vdev_t *vd) 2675{ 2676 vdev_t *rvd = spa->spa_root_vdev; 2677 2678 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2679 2680 if (vd == NULL) 2681 vd = rvd; 2682 2683 vd->vdev_stat.vs_read_errors = 0; 2684 vd->vdev_stat.vs_write_errors = 0; 2685 vd->vdev_stat.vs_checksum_errors = 0; 2686 2687 for (int c = 0; c < vd->vdev_children; c++) 2688 vdev_clear(spa, vd->vdev_child[c]); 2689 2690 if (vd == rvd) { 2691 for (int c = 0; c < spa->spa_l2cache.sav_count; c++) 2692 vdev_clear(spa, spa->spa_l2cache.sav_vdevs[c]); 2693 2694 for (int c = 0; c < spa->spa_spares.sav_count; c++) 2695 vdev_clear(spa, spa->spa_spares.sav_vdevs[c]); 2696 } 2697 2698 /* 2699 * If we're in the FAULTED state or have experienced failed I/O, then 2700 * clear the persistent state and attempt to reopen the device. We 2701 * also mark the vdev config dirty, so that the new faulted state is 2702 * written out to disk. 2703 */ 2704 if (vd->vdev_faulted || vd->vdev_degraded || 2705 !vdev_readable(vd) || !vdev_writeable(vd)) { 2706 2707 /* 2708 * When reopening in reponse to a clear event, it may be due to 2709 * a fmadm repair request. In this case, if the device is 2710 * still broken, we want to still post the ereport again. 2711 */ 2712 vd->vdev_forcefault = B_TRUE; 2713 2714 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2715 vd->vdev_cant_read = B_FALSE; 2716 vd->vdev_cant_write = B_FALSE; 2717 2718 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2719 2720 vd->vdev_forcefault = B_FALSE; 2721 2722 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2723 vdev_state_dirty(vd->vdev_top); 2724 2725 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2726 spa_async_request(spa, SPA_ASYNC_RESILVER); 2727 2728 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2729 } 2730 2731 /* 2732 * When clearing a FMA-diagnosed fault, we always want to 2733 * unspare the device, as we assume that the original spare was 2734 * done in response to the FMA fault. 2735 */ 2736 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2737 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2738 vd->vdev_parent->vdev_child[0] == vd) 2739 vd->vdev_unspare = B_TRUE; 2740} 2741 2742boolean_t 2743vdev_is_dead(vdev_t *vd) 2744{ 2745 /* 2746 * Holes and missing devices are always considered "dead". 2747 * This simplifies the code since we don't have to check for 2748 * these types of devices in the various code paths. 2749 * Instead we rely on the fact that we skip over dead devices 2750 * before issuing I/O to them. 2751 */ 2752 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2753 vd->vdev_ops == &vdev_missing_ops); 2754} 2755 2756boolean_t 2757vdev_readable(vdev_t *vd) 2758{ 2759 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2760} 2761 2762boolean_t 2763vdev_writeable(vdev_t *vd) 2764{ 2765 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2766} 2767 2768boolean_t 2769vdev_allocatable(vdev_t *vd) 2770{ 2771 uint64_t state = vd->vdev_state; 2772 2773 /* 2774 * We currently allow allocations from vdevs which may be in the 2775 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2776 * fails to reopen then we'll catch it later when we're holding 2777 * the proper locks. Note that we have to get the vdev state 2778 * in a local variable because although it changes atomically, 2779 * we're asking two separate questions about it. 2780 */ 2781 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2782 !vd->vdev_cant_write && !vd->vdev_ishole); 2783} 2784 2785boolean_t 2786vdev_accessible(vdev_t *vd, zio_t *zio) 2787{ 2788 ASSERT(zio->io_vd == vd); 2789 2790 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2791 return (B_FALSE); 2792 2793 if (zio->io_type == ZIO_TYPE_READ) 2794 return (!vd->vdev_cant_read); 2795 2796 if (zio->io_type == ZIO_TYPE_WRITE) 2797 return (!vd->vdev_cant_write); 2798 2799 return (B_TRUE); 2800} 2801 2802/* 2803 * Get statistics for the given vdev. 2804 */ 2805void 2806vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2807{ 2808 spa_t *spa = vd->vdev_spa; 2809 vdev_t *rvd = spa->spa_root_vdev; 2810 2811 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2812 2813 mutex_enter(&vd->vdev_stat_lock); 2814 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2815 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2816 vs->vs_state = vd->vdev_state; 2817 vs->vs_rsize = vdev_get_min_asize(vd); 2818 if (vd->vdev_ops->vdev_op_leaf) 2819 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2820 if (vd->vdev_max_asize != 0) 2821 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize; 2822 vs->vs_configured_ashift = vd->vdev_top != NULL 2823 ? vd->vdev_top->vdev_ashift : vd->vdev_ashift; 2824 vs->vs_logical_ashift = vd->vdev_logical_ashift; 2825 vs->vs_physical_ashift = vd->vdev_physical_ashift; 2826 if (vd->vdev_aux == NULL && vd == vd->vdev_top && !vd->vdev_ishole) { 2827 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation; 2828 } 2829 2830 /* 2831 * If we're getting stats on the root vdev, aggregate the I/O counts 2832 * over all top-level vdevs (i.e. the direct children of the root). 2833 */ 2834 if (vd == rvd) { 2835 for (int c = 0; c < rvd->vdev_children; c++) { 2836 vdev_t *cvd = rvd->vdev_child[c]; 2837 vdev_stat_t *cvs = &cvd->vdev_stat; 2838 2839 for (int t = 0; t < ZIO_TYPES; t++) { 2840 vs->vs_ops[t] += cvs->vs_ops[t]; 2841 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2842 } 2843 cvs->vs_scan_removing = cvd->vdev_removing; 2844 } 2845 } 2846 mutex_exit(&vd->vdev_stat_lock); 2847} 2848 2849void 2850vdev_clear_stats(vdev_t *vd) 2851{ 2852 mutex_enter(&vd->vdev_stat_lock); 2853 vd->vdev_stat.vs_space = 0; 2854 vd->vdev_stat.vs_dspace = 0; 2855 vd->vdev_stat.vs_alloc = 0; 2856 mutex_exit(&vd->vdev_stat_lock); 2857} 2858 2859void 2860vdev_scan_stat_init(vdev_t *vd) 2861{ 2862 vdev_stat_t *vs = &vd->vdev_stat; 2863 2864 for (int c = 0; c < vd->vdev_children; c++) 2865 vdev_scan_stat_init(vd->vdev_child[c]); 2866 2867 mutex_enter(&vd->vdev_stat_lock); 2868 vs->vs_scan_processed = 0; 2869 mutex_exit(&vd->vdev_stat_lock); 2870} 2871 2872void 2873vdev_stat_update(zio_t *zio, uint64_t psize) 2874{ 2875 spa_t *spa = zio->io_spa; 2876 vdev_t *rvd = spa->spa_root_vdev; 2877 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2878 vdev_t *pvd; 2879 uint64_t txg = zio->io_txg; 2880 vdev_stat_t *vs = &vd->vdev_stat; 2881 zio_type_t type = zio->io_type; 2882 int flags = zio->io_flags; 2883 2884 /* 2885 * If this i/o is a gang leader, it didn't do any actual work. 2886 */ 2887 if (zio->io_gang_tree) 2888 return; 2889 2890 if (zio->io_error == 0) { 2891 /* 2892 * If this is a root i/o, don't count it -- we've already 2893 * counted the top-level vdevs, and vdev_get_stats() will 2894 * aggregate them when asked. This reduces contention on 2895 * the root vdev_stat_lock and implicitly handles blocks 2896 * that compress away to holes, for which there is no i/o. 2897 * (Holes never create vdev children, so all the counters 2898 * remain zero, which is what we want.) 2899 * 2900 * Note: this only applies to successful i/o (io_error == 0) 2901 * because unlike i/o counts, errors are not additive. 2902 * When reading a ditto block, for example, failure of 2903 * one top-level vdev does not imply a root-level error. 2904 */ 2905 if (vd == rvd) 2906 return; 2907 2908 ASSERT(vd == zio->io_vd); 2909 2910 if (flags & ZIO_FLAG_IO_BYPASS) 2911 return; 2912 2913 mutex_enter(&vd->vdev_stat_lock); 2914 2915 if (flags & ZIO_FLAG_IO_REPAIR) { 2916 if (flags & ZIO_FLAG_SCAN_THREAD) { 2917 dsl_scan_phys_t *scn_phys = 2918 &spa->spa_dsl_pool->dp_scan->scn_phys; 2919 uint64_t *processed = &scn_phys->scn_processed; 2920 2921 /* XXX cleanup? */ 2922 if (vd->vdev_ops->vdev_op_leaf) 2923 atomic_add_64(processed, psize); 2924 vs->vs_scan_processed += psize; 2925 } 2926 2927 if (flags & ZIO_FLAG_SELF_HEAL) 2928 vs->vs_self_healed += psize; 2929 } 2930 2931 vs->vs_ops[type]++; 2932 vs->vs_bytes[type] += psize; 2933 2934 mutex_exit(&vd->vdev_stat_lock); 2935 return; 2936 } 2937 2938 if (flags & ZIO_FLAG_SPECULATIVE) 2939 return; 2940 2941 /* 2942 * If this is an I/O error that is going to be retried, then ignore the 2943 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2944 * hard errors, when in reality they can happen for any number of 2945 * innocuous reasons (bus resets, MPxIO link failure, etc). 2946 */ 2947 if (zio->io_error == EIO && 2948 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2949 return; 2950 2951 /* 2952 * Intent logs writes won't propagate their error to the root 2953 * I/O so don't mark these types of failures as pool-level 2954 * errors. 2955 */ 2956 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2957 return; 2958 2959 mutex_enter(&vd->vdev_stat_lock); 2960 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2961 if (zio->io_error == ECKSUM) 2962 vs->vs_checksum_errors++; 2963 else 2964 vs->vs_read_errors++; 2965 } 2966 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2967 vs->vs_write_errors++; 2968 mutex_exit(&vd->vdev_stat_lock); 2969 2970 if (type == ZIO_TYPE_WRITE && txg != 0 && 2971 (!(flags & ZIO_FLAG_IO_REPAIR) || 2972 (flags & ZIO_FLAG_SCAN_THREAD) || 2973 spa->spa_claiming)) { 2974 /* 2975 * This is either a normal write (not a repair), or it's 2976 * a repair induced by the scrub thread, or it's a repair 2977 * made by zil_claim() during spa_load() in the first txg. 2978 * In the normal case, we commit the DTL change in the same 2979 * txg as the block was born. In the scrub-induced repair 2980 * case, we know that scrubs run in first-pass syncing context, 2981 * so we commit the DTL change in spa_syncing_txg(spa). 2982 * In the zil_claim() case, we commit in spa_first_txg(spa). 2983 * 2984 * We currently do not make DTL entries for failed spontaneous 2985 * self-healing writes triggered by normal (non-scrubbing) 2986 * reads, because we have no transactional context in which to 2987 * do so -- and it's not clear that it'd be desirable anyway. 2988 */ 2989 if (vd->vdev_ops->vdev_op_leaf) { 2990 uint64_t commit_txg = txg; 2991 if (flags & ZIO_FLAG_SCAN_THREAD) { 2992 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2993 ASSERT(spa_sync_pass(spa) == 1); 2994 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 2995 commit_txg = spa_syncing_txg(spa); 2996 } else if (spa->spa_claiming) { 2997 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2998 commit_txg = spa_first_txg(spa); 2999 } 3000 ASSERT(commit_txg >= spa_syncing_txg(spa)); 3001 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 3002 return; 3003 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3004 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 3005 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 3006 } 3007 if (vd != rvd) 3008 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 3009 } 3010} 3011 3012/* 3013 * Update the in-core space usage stats for this vdev, its metaslab class, 3014 * and the root vdev. 3015 */ 3016void 3017vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 3018 int64_t space_delta) 3019{ 3020 int64_t dspace_delta = space_delta; 3021 spa_t *spa = vd->vdev_spa; 3022 vdev_t *rvd = spa->spa_root_vdev; 3023 metaslab_group_t *mg = vd->vdev_mg; 3024 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 3025 3026 ASSERT(vd == vd->vdev_top); 3027 3028 /* 3029 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 3030 * factor. We must calculate this here and not at the root vdev 3031 * because the root vdev's psize-to-asize is simply the max of its 3032 * childrens', thus not accurate enough for us. 3033 */ 3034 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 3035 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 3036 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 3037 vd->vdev_deflate_ratio; 3038 3039 mutex_enter(&vd->vdev_stat_lock); 3040 vd->vdev_stat.vs_alloc += alloc_delta; 3041 vd->vdev_stat.vs_space += space_delta; 3042 vd->vdev_stat.vs_dspace += dspace_delta; 3043 mutex_exit(&vd->vdev_stat_lock); 3044 3045 if (mc == spa_normal_class(spa)) { 3046 mutex_enter(&rvd->vdev_stat_lock); 3047 rvd->vdev_stat.vs_alloc += alloc_delta; 3048 rvd->vdev_stat.vs_space += space_delta; 3049 rvd->vdev_stat.vs_dspace += dspace_delta; 3050 mutex_exit(&rvd->vdev_stat_lock); 3051 } 3052 3053 if (mc != NULL) { 3054 ASSERT(rvd == vd->vdev_parent); 3055 ASSERT(vd->vdev_ms_count != 0); 3056 3057 metaslab_class_space_update(mc, 3058 alloc_delta, defer_delta, space_delta, dspace_delta); 3059 } 3060} 3061 3062/* 3063 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3064 * so that it will be written out next time the vdev configuration is synced. 3065 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3066 */ 3067void 3068vdev_config_dirty(vdev_t *vd) 3069{ 3070 spa_t *spa = vd->vdev_spa; 3071 vdev_t *rvd = spa->spa_root_vdev; 3072 int c; 3073 3074 ASSERT(spa_writeable(spa)); 3075 3076 /* 3077 * If this is an aux vdev (as with l2cache and spare devices), then we 3078 * update the vdev config manually and set the sync flag. 3079 */ 3080 if (vd->vdev_aux != NULL) { 3081 spa_aux_vdev_t *sav = vd->vdev_aux; 3082 nvlist_t **aux; 3083 uint_t naux; 3084 3085 for (c = 0; c < sav->sav_count; c++) { 3086 if (sav->sav_vdevs[c] == vd) 3087 break; 3088 } 3089 3090 if (c == sav->sav_count) { 3091 /* 3092 * We're being removed. There's nothing more to do. 3093 */ 3094 ASSERT(sav->sav_sync == B_TRUE); 3095 return; 3096 } 3097 3098 sav->sav_sync = B_TRUE; 3099 3100 if (nvlist_lookup_nvlist_array(sav->sav_config, 3101 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3102 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3103 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3104 } 3105 3106 ASSERT(c < naux); 3107 3108 /* 3109 * Setting the nvlist in the middle if the array is a little 3110 * sketchy, but it will work. 3111 */ 3112 nvlist_free(aux[c]); 3113 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3114 3115 return; 3116 } 3117 3118 /* 3119 * The dirty list is protected by the SCL_CONFIG lock. The caller 3120 * must either hold SCL_CONFIG as writer, or must be the sync thread 3121 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3122 * so this is sufficient to ensure mutual exclusion. 3123 */ 3124 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3125 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3126 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3127 3128 if (vd == rvd) { 3129 for (c = 0; c < rvd->vdev_children; c++) 3130 vdev_config_dirty(rvd->vdev_child[c]); 3131 } else { 3132 ASSERT(vd == vd->vdev_top); 3133 3134 if (!list_link_active(&vd->vdev_config_dirty_node) && 3135 !vd->vdev_ishole) 3136 list_insert_head(&spa->spa_config_dirty_list, vd); 3137 } 3138} 3139 3140void 3141vdev_config_clean(vdev_t *vd) 3142{ 3143 spa_t *spa = vd->vdev_spa; 3144 3145 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3146 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3147 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3148 3149 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3150 list_remove(&spa->spa_config_dirty_list, vd); 3151} 3152 3153/* 3154 * Mark a top-level vdev's state as dirty, so that the next pass of 3155 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3156 * the state changes from larger config changes because they require 3157 * much less locking, and are often needed for administrative actions. 3158 */ 3159void 3160vdev_state_dirty(vdev_t *vd) 3161{ 3162 spa_t *spa = vd->vdev_spa; 3163 3164 ASSERT(spa_writeable(spa)); 3165 ASSERT(vd == vd->vdev_top); 3166 3167 /* 3168 * The state list is protected by the SCL_STATE lock. The caller 3169 * must either hold SCL_STATE as writer, or must be the sync thread 3170 * (which holds SCL_STATE as reader). There's only one sync thread, 3171 * so this is sufficient to ensure mutual exclusion. 3172 */ 3173 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3174 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3175 spa_config_held(spa, SCL_STATE, RW_READER))); 3176 3177 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 3178 list_insert_head(&spa->spa_state_dirty_list, vd); 3179} 3180 3181void 3182vdev_state_clean(vdev_t *vd) 3183{ 3184 spa_t *spa = vd->vdev_spa; 3185 3186 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3187 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3188 spa_config_held(spa, SCL_STATE, RW_READER))); 3189 3190 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3191 list_remove(&spa->spa_state_dirty_list, vd); 3192} 3193 3194/* 3195 * Propagate vdev state up from children to parent. 3196 */ 3197void 3198vdev_propagate_state(vdev_t *vd) 3199{ 3200 spa_t *spa = vd->vdev_spa; 3201 vdev_t *rvd = spa->spa_root_vdev; 3202 int degraded = 0, faulted = 0; 3203 int corrupted = 0; 3204 vdev_t *child; 3205 3206 if (vd->vdev_children > 0) { 3207 for (int c = 0; c < vd->vdev_children; c++) { 3208 child = vd->vdev_child[c]; 3209 3210 /* 3211 * Don't factor holes into the decision. 3212 */ 3213 if (child->vdev_ishole) 3214 continue; 3215 3216 if (!vdev_readable(child) || 3217 (!vdev_writeable(child) && spa_writeable(spa))) { 3218 /* 3219 * Root special: if there is a top-level log 3220 * device, treat the root vdev as if it were 3221 * degraded. 3222 */ 3223 if (child->vdev_islog && vd == rvd) 3224 degraded++; 3225 else 3226 faulted++; 3227 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3228 degraded++; 3229 } 3230 3231 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3232 corrupted++; 3233 } 3234 3235 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3236 3237 /* 3238 * Root special: if there is a top-level vdev that cannot be 3239 * opened due to corrupted metadata, then propagate the root 3240 * vdev's aux state as 'corrupt' rather than 'insufficient 3241 * replicas'. 3242 */ 3243 if (corrupted && vd == rvd && 3244 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3245 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3246 VDEV_AUX_CORRUPT_DATA); 3247 } 3248 3249 if (vd->vdev_parent) 3250 vdev_propagate_state(vd->vdev_parent); 3251} 3252 3253/* 3254 * Set a vdev's state. If this is during an open, we don't update the parent 3255 * state, because we're in the process of opening children depth-first. 3256 * Otherwise, we propagate the change to the parent. 3257 * 3258 * If this routine places a device in a faulted state, an appropriate ereport is 3259 * generated. 3260 */ 3261void 3262vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 3263{ 3264 uint64_t save_state; 3265 spa_t *spa = vd->vdev_spa; 3266 3267 if (state == vd->vdev_state) { 3268 vd->vdev_stat.vs_aux = aux; 3269 return; 3270 } 3271 3272 save_state = vd->vdev_state; 3273 3274 vd->vdev_state = state; 3275 vd->vdev_stat.vs_aux = aux; 3276 3277 /* 3278 * If we are setting the vdev state to anything but an open state, then 3279 * always close the underlying device unless the device has requested 3280 * a delayed close (i.e. we're about to remove or fault the device). 3281 * Otherwise, we keep accessible but invalid devices open forever. 3282 * We don't call vdev_close() itself, because that implies some extra 3283 * checks (offline, etc) that we don't want here. This is limited to 3284 * leaf devices, because otherwise closing the device will affect other 3285 * children. 3286 */ 3287 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 3288 vd->vdev_ops->vdev_op_leaf) 3289 vd->vdev_ops->vdev_op_close(vd); 3290 3291 /* 3292 * If we have brought this vdev back into service, we need 3293 * to notify fmd so that it can gracefully repair any outstanding 3294 * cases due to a missing device. We do this in all cases, even those 3295 * that probably don't correlate to a repaired fault. This is sure to 3296 * catch all cases, and we let the zfs-retire agent sort it out. If 3297 * this is a transient state it's OK, as the retire agent will 3298 * double-check the state of the vdev before repairing it. 3299 */ 3300 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 3301 vd->vdev_prevstate != state) 3302 zfs_post_state_change(spa, vd); 3303 3304 if (vd->vdev_removed && 3305 state == VDEV_STATE_CANT_OPEN && 3306 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 3307 /* 3308 * If the previous state is set to VDEV_STATE_REMOVED, then this 3309 * device was previously marked removed and someone attempted to 3310 * reopen it. If this failed due to a nonexistent device, then 3311 * keep the device in the REMOVED state. We also let this be if 3312 * it is one of our special test online cases, which is only 3313 * attempting to online the device and shouldn't generate an FMA 3314 * fault. 3315 */ 3316 vd->vdev_state = VDEV_STATE_REMOVED; 3317 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 3318 } else if (state == VDEV_STATE_REMOVED) { 3319 vd->vdev_removed = B_TRUE; 3320 } else if (state == VDEV_STATE_CANT_OPEN) { 3321 /* 3322 * If we fail to open a vdev during an import or recovery, we 3323 * mark it as "not available", which signifies that it was 3324 * never there to begin with. Failure to open such a device 3325 * is not considered an error. 3326 */ 3327 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 3328 spa_load_state(spa) == SPA_LOAD_RECOVER) && 3329 vd->vdev_ops->vdev_op_leaf) 3330 vd->vdev_not_present = 1; 3331 3332 /* 3333 * Post the appropriate ereport. If the 'prevstate' field is 3334 * set to something other than VDEV_STATE_UNKNOWN, it indicates 3335 * that this is part of a vdev_reopen(). In this case, we don't 3336 * want to post the ereport if the device was already in the 3337 * CANT_OPEN state beforehand. 3338 * 3339 * If the 'checkremove' flag is set, then this is an attempt to 3340 * online the device in response to an insertion event. If we 3341 * hit this case, then we have detected an insertion event for a 3342 * faulted or offline device that wasn't in the removed state. 3343 * In this scenario, we don't post an ereport because we are 3344 * about to replace the device, or attempt an online with 3345 * vdev_forcefault, which will generate the fault for us. 3346 */ 3347 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 3348 !vd->vdev_not_present && !vd->vdev_checkremove && 3349 vd != spa->spa_root_vdev) { 3350 const char *class; 3351 3352 switch (aux) { 3353 case VDEV_AUX_OPEN_FAILED: 3354 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 3355 break; 3356 case VDEV_AUX_CORRUPT_DATA: 3357 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3358 break; 3359 case VDEV_AUX_NO_REPLICAS: 3360 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3361 break; 3362 case VDEV_AUX_BAD_GUID_SUM: 3363 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3364 break; 3365 case VDEV_AUX_TOO_SMALL: 3366 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3367 break; 3368 case VDEV_AUX_BAD_LABEL: 3369 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3370 break; 3371 default: 3372 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3373 } 3374 3375 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3376 } 3377 3378 /* Erase any notion of persistent removed state */ 3379 vd->vdev_removed = B_FALSE; 3380 } else { 3381 vd->vdev_removed = B_FALSE; 3382 } 3383 3384 if (!isopen && vd->vdev_parent) 3385 vdev_propagate_state(vd->vdev_parent); 3386} 3387 3388/* 3389 * Check the vdev configuration to ensure that it's capable of supporting 3390 * a root pool. 3391 * 3392 * On Solaris, we do not support RAID-Z or partial configuration. In 3393 * addition, only a single top-level vdev is allowed and none of the 3394 * leaves can be wholedisks. 3395 * 3396 * For FreeBSD, we can boot from any configuration. There is a 3397 * limitation that the boot filesystem must be either uncompressed or 3398 * compresses with lzjb compression but I'm not sure how to enforce 3399 * that here. 3400 */ 3401boolean_t 3402vdev_is_bootable(vdev_t *vd) 3403{ 3404#ifdef sun 3405 if (!vd->vdev_ops->vdev_op_leaf) { 3406 char *vdev_type = vd->vdev_ops->vdev_op_type; 3407 3408 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3409 vd->vdev_children > 1) { 3410 return (B_FALSE); 3411 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3412 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3413 return (B_FALSE); 3414 } 3415 } 3416 3417 for (int c = 0; c < vd->vdev_children; c++) { 3418 if (!vdev_is_bootable(vd->vdev_child[c])) 3419 return (B_FALSE); 3420 } 3421#endif /* sun */ 3422 return (B_TRUE); 3423} 3424 3425/* 3426 * Load the state from the original vdev tree (ovd) which 3427 * we've retrieved from the MOS config object. If the original 3428 * vdev was offline or faulted then we transfer that state to the 3429 * device in the current vdev tree (nvd). 3430 */ 3431void 3432vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3433{ 3434 spa_t *spa = nvd->vdev_spa; 3435 3436 ASSERT(nvd->vdev_top->vdev_islog); 3437 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3438 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3439 3440 for (int c = 0; c < nvd->vdev_children; c++) 3441 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3442 3443 if (nvd->vdev_ops->vdev_op_leaf) { 3444 /* 3445 * Restore the persistent vdev state 3446 */ 3447 nvd->vdev_offline = ovd->vdev_offline; 3448 nvd->vdev_faulted = ovd->vdev_faulted; 3449 nvd->vdev_degraded = ovd->vdev_degraded; 3450 nvd->vdev_removed = ovd->vdev_removed; 3451 } 3452} 3453 3454/* 3455 * Determine if a log device has valid content. If the vdev was 3456 * removed or faulted in the MOS config then we know that 3457 * the content on the log device has already been written to the pool. 3458 */ 3459boolean_t 3460vdev_log_state_valid(vdev_t *vd) 3461{ 3462 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3463 !vd->vdev_removed) 3464 return (B_TRUE); 3465 3466 for (int c = 0; c < vd->vdev_children; c++) 3467 if (vdev_log_state_valid(vd->vdev_child[c])) 3468 return (B_TRUE); 3469 3470 return (B_FALSE); 3471} 3472 3473/* 3474 * Expand a vdev if possible. 3475 */ 3476void 3477vdev_expand(vdev_t *vd, uint64_t txg) 3478{ 3479 ASSERT(vd->vdev_top == vd); 3480 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3481 3482 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3483 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3484 vdev_config_dirty(vd); 3485 } 3486} 3487 3488/* 3489 * Split a vdev. 3490 */ 3491void 3492vdev_split(vdev_t *vd) 3493{ 3494 vdev_t *cvd, *pvd = vd->vdev_parent; 3495 3496 vdev_remove_child(pvd, vd); 3497 vdev_compact_children(pvd); 3498 3499 cvd = pvd->vdev_child[0]; 3500 if (pvd->vdev_children == 1) { 3501 vdev_remove_parent(cvd); 3502 cvd->vdev_splitting = B_TRUE; 3503 } 3504 vdev_propagate_state(cvd); 3505} 3506 3507void 3508vdev_deadman(vdev_t *vd) 3509{ 3510 for (int c = 0; c < vd->vdev_children; c++) { 3511 vdev_t *cvd = vd->vdev_child[c]; 3512 3513 vdev_deadman(cvd); 3514 } 3515 3516 if (vd->vdev_ops->vdev_op_leaf) { 3517 vdev_queue_t *vq = &vd->vdev_queue; 3518 3519 mutex_enter(&vq->vq_lock); 3520 if (avl_numnodes(&vq->vq_active_tree) > 0) { 3521 spa_t *spa = vd->vdev_spa; 3522 zio_t *fio; 3523 uint64_t delta; 3524 3525 /* 3526 * Look at the head of all the pending queues, 3527 * if any I/O has been outstanding for longer than 3528 * the spa_deadman_synctime we panic the system. 3529 */ 3530 fio = avl_first(&vq->vq_active_tree); 3531 delta = gethrtime() - fio->io_timestamp; 3532 if (delta > spa_deadman_synctime(spa)) { 3533 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, " 3534 "delta %lluns, last io %lluns", 3535 fio->io_timestamp, delta, 3536 vq->vq_io_complete_ts); 3537 fm_panic("I/O to pool '%s' appears to be " 3538 "hung on vdev guid %llu at '%s'.", 3539 spa_name(spa), 3540 (long long unsigned int) vd->vdev_guid, 3541 vd->vdev_path); 3542 } 3543 } 3544 mutex_exit(&vq->vq_lock); 3545 } 3546} 3547