vdev.c revision 332547
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, 2018 by Delphix. All rights reserved. 25 * Copyright 2017 Nexenta Systems, Inc. 26 * Copyright 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 * Copyright (c) 2014 Integros [integros.com] 28 * Copyright 2016 Toomas Soome <tsoome@me.com> 29 * Copyright 2017 Joyent, Inc. 30 */ 31 32#include <sys/zfs_context.h> 33#include <sys/fm/fs/zfs.h> 34#include <sys/spa.h> 35#include <sys/spa_impl.h> 36#include <sys/bpobj.h> 37#include <sys/dmu.h> 38#include <sys/dmu_tx.h> 39#include <sys/dsl_dir.h> 40#include <sys/vdev_impl.h> 41#include <sys/uberblock_impl.h> 42#include <sys/metaslab.h> 43#include <sys/metaslab_impl.h> 44#include <sys/space_map.h> 45#include <sys/space_reftree.h> 46#include <sys/zio.h> 47#include <sys/zap.h> 48#include <sys/fs/zfs.h> 49#include <sys/arc.h> 50#include <sys/zil.h> 51#include <sys/dsl_scan.h> 52#include <sys/abd.h> 53#include <sys/trim_map.h> 54 55SYSCTL_DECL(_vfs_zfs); 56SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 57 58/* 59 * Virtual device management. 60 */ 61 62/* 63 * The limit for ZFS to automatically increase a top-level vdev's ashift 64 * from logical ashift to physical ashift. 65 * 66 * Example: one or more 512B emulation child vdevs 67 * child->vdev_ashift = 9 (512 bytes) 68 * child->vdev_physical_ashift = 12 (4096 bytes) 69 * zfs_max_auto_ashift = 11 (2048 bytes) 70 * zfs_min_auto_ashift = 9 (512 bytes) 71 * 72 * On pool creation or the addition of a new top-level vdev, ZFS will 73 * increase the ashift of the top-level vdev to 2048 as limited by 74 * zfs_max_auto_ashift. 75 * 76 * Example: one or more 512B emulation child vdevs 77 * child->vdev_ashift = 9 (512 bytes) 78 * child->vdev_physical_ashift = 12 (4096 bytes) 79 * zfs_max_auto_ashift = 13 (8192 bytes) 80 * zfs_min_auto_ashift = 9 (512 bytes) 81 * 82 * On pool creation or the addition of a new top-level vdev, ZFS will 83 * increase the ashift of the top-level vdev to 4096 to match the 84 * max vdev_physical_ashift. 85 * 86 * Example: one or more 512B emulation child vdevs 87 * child->vdev_ashift = 9 (512 bytes) 88 * child->vdev_physical_ashift = 9 (512 bytes) 89 * zfs_max_auto_ashift = 13 (8192 bytes) 90 * zfs_min_auto_ashift = 12 (4096 bytes) 91 * 92 * On pool creation or the addition of a new top-level vdev, ZFS will 93 * increase the ashift of the top-level vdev to 4096 to match the 94 * zfs_min_auto_ashift. 95 */ 96static uint64_t zfs_max_auto_ashift = SPA_MAXASHIFT; 97static uint64_t zfs_min_auto_ashift = SPA_MINASHIFT; 98 99static int 100sysctl_vfs_zfs_max_auto_ashift(SYSCTL_HANDLER_ARGS) 101{ 102 uint64_t val; 103 int err; 104 105 val = zfs_max_auto_ashift; 106 err = sysctl_handle_64(oidp, &val, 0, req); 107 if (err != 0 || req->newptr == NULL) 108 return (err); 109 110 if (val > SPA_MAXASHIFT || val < zfs_min_auto_ashift) 111 return (EINVAL); 112 113 zfs_max_auto_ashift = val; 114 115 return (0); 116} 117SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift, 118 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 119 sysctl_vfs_zfs_max_auto_ashift, "QU", 120 "Max ashift used when optimising for logical -> physical sectors size on " 121 "new top-level vdevs."); 122 123static int 124sysctl_vfs_zfs_min_auto_ashift(SYSCTL_HANDLER_ARGS) 125{ 126 uint64_t val; 127 int err; 128 129 val = zfs_min_auto_ashift; 130 err = sysctl_handle_64(oidp, &val, 0, req); 131 if (err != 0 || req->newptr == NULL) 132 return (err); 133 134 if (val < SPA_MINASHIFT || val > zfs_max_auto_ashift) 135 return (EINVAL); 136 137 zfs_min_auto_ashift = val; 138 139 return (0); 140} 141SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift, 142 CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t), 143 sysctl_vfs_zfs_min_auto_ashift, "QU", 144 "Min ashift used when creating new top-level vdevs."); 145 146static vdev_ops_t *vdev_ops_table[] = { 147 &vdev_root_ops, 148 &vdev_raidz_ops, 149 &vdev_mirror_ops, 150 &vdev_replacing_ops, 151 &vdev_spare_ops, 152#ifdef _KERNEL 153 &vdev_geom_ops, 154#else 155 &vdev_disk_ops, 156#endif 157 &vdev_file_ops, 158 &vdev_missing_ops, 159 &vdev_hole_ops, 160 &vdev_indirect_ops, 161 NULL 162}; 163 164 165/* maximum number of metaslabs per top-level vdev */ 166int vdev_max_ms_count = 200; 167SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, max_ms_count, CTLFLAG_RDTUN, 168 &vdev_max_ms_count, 0, 169 "Maximum number of metaslabs per top-level vdev"); 170 171/* minimum amount of metaslabs per top-level vdev */ 172int vdev_min_ms_count = 16; 173SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, min_ms_count, CTLFLAG_RDTUN, 174 &vdev_min_ms_count, 0, 175 "Minimum number of metaslabs per top-level vdev"); 176 177/* see comment in vdev_metaslab_set_size() */ 178int vdev_default_ms_shift = 29; 179SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, default_ms_shift, CTLFLAG_RDTUN, 180 &vdev_default_ms_shift, 0, 181 "Shift between vdev size and number of metaslabs"); 182 183boolean_t vdev_validate_skip = B_FALSE; 184 185/* 186 * Since the DTL space map of a vdev is not expected to have a lot of 187 * entries, we default its block size to 4K. 188 */ 189int vdev_dtl_sm_blksz = (1 << 12); 190SYSCTL_INT(_vfs_zfs, OID_AUTO, dtl_sm_blksz, CTLFLAG_RDTUN, 191 &vdev_dtl_sm_blksz, 0, 192 "Block size for DTL space map. Power of 2 and greater than 4096."); 193 194/* 195 * vdev-wide space maps that have lots of entries written to them at 196 * the end of each transaction can benefit from a higher I/O bandwidth 197 * (e.g. vdev_obsolete_sm), thus we default their block size to 128K. 198 */ 199int vdev_standard_sm_blksz = (1 << 17); 200SYSCTL_INT(_vfs_zfs, OID_AUTO, standard_sm_blksz, CTLFLAG_RDTUN, 201 &vdev_standard_sm_blksz, 0, 202 "Block size for standard space map. Power of 2 and greater than 4096."); 203 204/*PRINTFLIKE2*/ 205void 206vdev_dbgmsg(vdev_t *vd, const char *fmt, ...) 207{ 208 va_list adx; 209 char buf[256]; 210 211 va_start(adx, fmt); 212 (void) vsnprintf(buf, sizeof (buf), fmt, adx); 213 va_end(adx); 214 215 if (vd->vdev_path != NULL) { 216 zfs_dbgmsg("%s vdev '%s': %s", vd->vdev_ops->vdev_op_type, 217 vd->vdev_path, buf); 218 } else { 219 zfs_dbgmsg("%s-%llu vdev (guid %llu): %s", 220 vd->vdev_ops->vdev_op_type, 221 (u_longlong_t)vd->vdev_id, 222 (u_longlong_t)vd->vdev_guid, buf); 223 } 224} 225 226void 227vdev_dbgmsg_print_tree(vdev_t *vd, int indent) 228{ 229 char state[20]; 230 231 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) { 232 zfs_dbgmsg("%*svdev %u: %s", indent, "", vd->vdev_id, 233 vd->vdev_ops->vdev_op_type); 234 return; 235 } 236 237 switch (vd->vdev_state) { 238 case VDEV_STATE_UNKNOWN: 239 (void) snprintf(state, sizeof (state), "unknown"); 240 break; 241 case VDEV_STATE_CLOSED: 242 (void) snprintf(state, sizeof (state), "closed"); 243 break; 244 case VDEV_STATE_OFFLINE: 245 (void) snprintf(state, sizeof (state), "offline"); 246 break; 247 case VDEV_STATE_REMOVED: 248 (void) snprintf(state, sizeof (state), "removed"); 249 break; 250 case VDEV_STATE_CANT_OPEN: 251 (void) snprintf(state, sizeof (state), "can't open"); 252 break; 253 case VDEV_STATE_FAULTED: 254 (void) snprintf(state, sizeof (state), "faulted"); 255 break; 256 case VDEV_STATE_DEGRADED: 257 (void) snprintf(state, sizeof (state), "degraded"); 258 break; 259 case VDEV_STATE_HEALTHY: 260 (void) snprintf(state, sizeof (state), "healthy"); 261 break; 262 default: 263 (void) snprintf(state, sizeof (state), "<state %u>", 264 (uint_t)vd->vdev_state); 265 } 266 267 zfs_dbgmsg("%*svdev %u: %s%s, guid: %llu, path: %s, %s", indent, 268 "", (int)vd->vdev_id, vd->vdev_ops->vdev_op_type, 269 vd->vdev_islog ? " (log)" : "", 270 (u_longlong_t)vd->vdev_guid, 271 vd->vdev_path ? vd->vdev_path : "N/A", state); 272 273 for (uint64_t i = 0; i < vd->vdev_children; i++) 274 vdev_dbgmsg_print_tree(vd->vdev_child[i], indent + 2); 275} 276 277/* 278 * Given a vdev type, return the appropriate ops vector. 279 */ 280static vdev_ops_t * 281vdev_getops(const char *type) 282{ 283 vdev_ops_t *ops, **opspp; 284 285 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 286 if (strcmp(ops->vdev_op_type, type) == 0) 287 break; 288 289 return (ops); 290} 291 292/* 293 * Default asize function: return the MAX of psize with the asize of 294 * all children. This is what's used by anything other than RAID-Z. 295 */ 296uint64_t 297vdev_default_asize(vdev_t *vd, uint64_t psize) 298{ 299 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 300 uint64_t csize; 301 302 for (int c = 0; c < vd->vdev_children; c++) { 303 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 304 asize = MAX(asize, csize); 305 } 306 307 return (asize); 308} 309 310/* 311 * Get the minimum allocatable size. We define the allocatable size as 312 * the vdev's asize rounded to the nearest metaslab. This allows us to 313 * replace or attach devices which don't have the same physical size but 314 * can still satisfy the same number of allocations. 315 */ 316uint64_t 317vdev_get_min_asize(vdev_t *vd) 318{ 319 vdev_t *pvd = vd->vdev_parent; 320 321 /* 322 * If our parent is NULL (inactive spare or cache) or is the root, 323 * just return our own asize. 324 */ 325 if (pvd == NULL) 326 return (vd->vdev_asize); 327 328 /* 329 * The top-level vdev just returns the allocatable size rounded 330 * to the nearest metaslab. 331 */ 332 if (vd == vd->vdev_top) 333 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 334 335 /* 336 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 337 * so each child must provide at least 1/Nth of its asize. 338 */ 339 if (pvd->vdev_ops == &vdev_raidz_ops) 340 return ((pvd->vdev_min_asize + pvd->vdev_children - 1) / 341 pvd->vdev_children); 342 343 return (pvd->vdev_min_asize); 344} 345 346void 347vdev_set_min_asize(vdev_t *vd) 348{ 349 vd->vdev_min_asize = vdev_get_min_asize(vd); 350 351 for (int c = 0; c < vd->vdev_children; c++) 352 vdev_set_min_asize(vd->vdev_child[c]); 353} 354 355vdev_t * 356vdev_lookup_top(spa_t *spa, uint64_t vdev) 357{ 358 vdev_t *rvd = spa->spa_root_vdev; 359 360 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 361 362 if (vdev < rvd->vdev_children) { 363 ASSERT(rvd->vdev_child[vdev] != NULL); 364 return (rvd->vdev_child[vdev]); 365 } 366 367 return (NULL); 368} 369 370vdev_t * 371vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 372{ 373 vdev_t *mvd; 374 375 if (vd->vdev_guid == guid) 376 return (vd); 377 378 for (int c = 0; c < vd->vdev_children; c++) 379 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 380 NULL) 381 return (mvd); 382 383 return (NULL); 384} 385 386static int 387vdev_count_leaves_impl(vdev_t *vd) 388{ 389 int n = 0; 390 391 if (vd->vdev_ops->vdev_op_leaf) 392 return (1); 393 394 for (int c = 0; c < vd->vdev_children; c++) 395 n += vdev_count_leaves_impl(vd->vdev_child[c]); 396 397 return (n); 398} 399 400int 401vdev_count_leaves(spa_t *spa) 402{ 403 return (vdev_count_leaves_impl(spa->spa_root_vdev)); 404} 405 406void 407vdev_add_child(vdev_t *pvd, vdev_t *cvd) 408{ 409 size_t oldsize, newsize; 410 uint64_t id = cvd->vdev_id; 411 vdev_t **newchild; 412 spa_t *spa = cvd->vdev_spa; 413 414 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 415 ASSERT(cvd->vdev_parent == NULL); 416 417 cvd->vdev_parent = pvd; 418 419 if (pvd == NULL) 420 return; 421 422 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 423 424 oldsize = pvd->vdev_children * sizeof (vdev_t *); 425 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 426 newsize = pvd->vdev_children * sizeof (vdev_t *); 427 428 newchild = kmem_zalloc(newsize, KM_SLEEP); 429 if (pvd->vdev_child != NULL) { 430 bcopy(pvd->vdev_child, newchild, oldsize); 431 kmem_free(pvd->vdev_child, oldsize); 432 } 433 434 pvd->vdev_child = newchild; 435 pvd->vdev_child[id] = cvd; 436 437 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 438 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 439 440 /* 441 * Walk up all ancestors to update guid sum. 442 */ 443 for (; pvd != NULL; pvd = pvd->vdev_parent) 444 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 445} 446 447void 448vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 449{ 450 int c; 451 uint_t id = cvd->vdev_id; 452 453 ASSERT(cvd->vdev_parent == pvd); 454 455 if (pvd == NULL) 456 return; 457 458 ASSERT(id < pvd->vdev_children); 459 ASSERT(pvd->vdev_child[id] == cvd); 460 461 pvd->vdev_child[id] = NULL; 462 cvd->vdev_parent = NULL; 463 464 for (c = 0; c < pvd->vdev_children; c++) 465 if (pvd->vdev_child[c]) 466 break; 467 468 if (c == pvd->vdev_children) { 469 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 470 pvd->vdev_child = NULL; 471 pvd->vdev_children = 0; 472 } 473 474 /* 475 * Walk up all ancestors to update guid sum. 476 */ 477 for (; pvd != NULL; pvd = pvd->vdev_parent) 478 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 479} 480 481/* 482 * Remove any holes in the child array. 483 */ 484void 485vdev_compact_children(vdev_t *pvd) 486{ 487 vdev_t **newchild, *cvd; 488 int oldc = pvd->vdev_children; 489 int newc; 490 491 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 492 493 for (int c = newc = 0; c < oldc; c++) 494 if (pvd->vdev_child[c]) 495 newc++; 496 497 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 498 499 for (int c = newc = 0; c < oldc; c++) { 500 if ((cvd = pvd->vdev_child[c]) != NULL) { 501 newchild[newc] = cvd; 502 cvd->vdev_id = newc++; 503 } 504 } 505 506 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 507 pvd->vdev_child = newchild; 508 pvd->vdev_children = newc; 509} 510 511/* 512 * Allocate and minimally initialize a vdev_t. 513 */ 514vdev_t * 515vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 516{ 517 vdev_t *vd; 518 vdev_indirect_config_t *vic; 519 520 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 521 vic = &vd->vdev_indirect_config; 522 523 if (spa->spa_root_vdev == NULL) { 524 ASSERT(ops == &vdev_root_ops); 525 spa->spa_root_vdev = vd; 526 spa->spa_load_guid = spa_generate_guid(NULL); 527 } 528 529 if (guid == 0 && ops != &vdev_hole_ops) { 530 if (spa->spa_root_vdev == vd) { 531 /* 532 * The root vdev's guid will also be the pool guid, 533 * which must be unique among all pools. 534 */ 535 guid = spa_generate_guid(NULL); 536 } else { 537 /* 538 * Any other vdev's guid must be unique within the pool. 539 */ 540 guid = spa_generate_guid(spa); 541 } 542 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 543 } 544 545 vd->vdev_spa = spa; 546 vd->vdev_id = id; 547 vd->vdev_guid = guid; 548 vd->vdev_guid_sum = guid; 549 vd->vdev_ops = ops; 550 vd->vdev_state = VDEV_STATE_CLOSED; 551 vd->vdev_ishole = (ops == &vdev_hole_ops); 552 vic->vic_prev_indirect_vdev = UINT64_MAX; 553 554 rw_init(&vd->vdev_indirect_rwlock, NULL, RW_DEFAULT, NULL); 555 mutex_init(&vd->vdev_obsolete_lock, NULL, MUTEX_DEFAULT, NULL); 556 vd->vdev_obsolete_segments = range_tree_create(NULL, NULL); 557 558 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 559 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 560 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 561 mutex_init(&vd->vdev_queue_lock, NULL, MUTEX_DEFAULT, NULL); 562 for (int t = 0; t < DTL_TYPES; t++) { 563 vd->vdev_dtl[t] = range_tree_create(NULL, NULL); 564 } 565 txg_list_create(&vd->vdev_ms_list, spa, 566 offsetof(struct metaslab, ms_txg_node)); 567 txg_list_create(&vd->vdev_dtl_list, spa, 568 offsetof(struct vdev, vdev_dtl_node)); 569 vd->vdev_stat.vs_timestamp = gethrtime(); 570 vdev_queue_init(vd); 571 vdev_cache_init(vd); 572 573 return (vd); 574} 575 576/* 577 * Allocate a new vdev. The 'alloctype' is used to control whether we are 578 * creating a new vdev or loading an existing one - the behavior is slightly 579 * different for each case. 580 */ 581int 582vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 583 int alloctype) 584{ 585 vdev_ops_t *ops; 586 char *type; 587 uint64_t guid = 0, islog, nparity; 588 vdev_t *vd; 589 vdev_indirect_config_t *vic; 590 591 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 592 593 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 594 return (SET_ERROR(EINVAL)); 595 596 if ((ops = vdev_getops(type)) == NULL) 597 return (SET_ERROR(EINVAL)); 598 599 /* 600 * If this is a load, get the vdev guid from the nvlist. 601 * Otherwise, vdev_alloc_common() will generate one for us. 602 */ 603 if (alloctype == VDEV_ALLOC_LOAD) { 604 uint64_t label_id; 605 606 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 607 label_id != id) 608 return (SET_ERROR(EINVAL)); 609 610 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 611 return (SET_ERROR(EINVAL)); 612 } else if (alloctype == VDEV_ALLOC_SPARE) { 613 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 614 return (SET_ERROR(EINVAL)); 615 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 616 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 617 return (SET_ERROR(EINVAL)); 618 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 619 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 620 return (SET_ERROR(EINVAL)); 621 } 622 623 /* 624 * The first allocated vdev must be of type 'root'. 625 */ 626 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 627 return (SET_ERROR(EINVAL)); 628 629 /* 630 * Determine whether we're a log vdev. 631 */ 632 islog = 0; 633 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 634 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 635 return (SET_ERROR(ENOTSUP)); 636 637 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 638 return (SET_ERROR(ENOTSUP)); 639 640 /* 641 * Set the nparity property for RAID-Z vdevs. 642 */ 643 nparity = -1ULL; 644 if (ops == &vdev_raidz_ops) { 645 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 646 &nparity) == 0) { 647 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 648 return (SET_ERROR(EINVAL)); 649 /* 650 * Previous versions could only support 1 or 2 parity 651 * device. 652 */ 653 if (nparity > 1 && 654 spa_version(spa) < SPA_VERSION_RAIDZ2) 655 return (SET_ERROR(ENOTSUP)); 656 if (nparity > 2 && 657 spa_version(spa) < SPA_VERSION_RAIDZ3) 658 return (SET_ERROR(ENOTSUP)); 659 } else { 660 /* 661 * We require the parity to be specified for SPAs that 662 * support multiple parity levels. 663 */ 664 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 665 return (SET_ERROR(EINVAL)); 666 /* 667 * Otherwise, we default to 1 parity device for RAID-Z. 668 */ 669 nparity = 1; 670 } 671 } else { 672 nparity = 0; 673 } 674 ASSERT(nparity != -1ULL); 675 676 vd = vdev_alloc_common(spa, id, guid, ops); 677 vic = &vd->vdev_indirect_config; 678 679 vd->vdev_islog = islog; 680 vd->vdev_nparity = nparity; 681 682 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 683 vd->vdev_path = spa_strdup(vd->vdev_path); 684 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 685 vd->vdev_devid = spa_strdup(vd->vdev_devid); 686 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 687 &vd->vdev_physpath) == 0) 688 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 689 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 690 vd->vdev_fru = spa_strdup(vd->vdev_fru); 691 692 /* 693 * Set the whole_disk property. If it's not specified, leave the value 694 * as -1. 695 */ 696 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 697 &vd->vdev_wholedisk) != 0) 698 vd->vdev_wholedisk = -1ULL; 699 700 ASSERT0(vic->vic_mapping_object); 701 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_INDIRECT_OBJECT, 702 &vic->vic_mapping_object); 703 ASSERT0(vic->vic_births_object); 704 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_INDIRECT_BIRTHS, 705 &vic->vic_births_object); 706 ASSERT3U(vic->vic_prev_indirect_vdev, ==, UINT64_MAX); 707 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_PREV_INDIRECT_VDEV, 708 &vic->vic_prev_indirect_vdev); 709 710 /* 711 * Look for the 'not present' flag. This will only be set if the device 712 * was not present at the time of import. 713 */ 714 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 715 &vd->vdev_not_present); 716 717 /* 718 * Get the alignment requirement. 719 */ 720 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 721 722 /* 723 * Retrieve the vdev creation time. 724 */ 725 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 726 &vd->vdev_crtxg); 727 728 /* 729 * If we're a top-level vdev, try to load the allocation parameters. 730 */ 731 if (parent && !parent->vdev_parent && 732 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 733 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 734 &vd->vdev_ms_array); 735 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 736 &vd->vdev_ms_shift); 737 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 738 &vd->vdev_asize); 739 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 740 &vd->vdev_removing); 741 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_VDEV_TOP_ZAP, 742 &vd->vdev_top_zap); 743 } else { 744 ASSERT0(vd->vdev_top_zap); 745 } 746 747 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) { 748 ASSERT(alloctype == VDEV_ALLOC_LOAD || 749 alloctype == VDEV_ALLOC_ADD || 750 alloctype == VDEV_ALLOC_SPLIT || 751 alloctype == VDEV_ALLOC_ROOTPOOL); 752 vd->vdev_mg = metaslab_group_create(islog ? 753 spa_log_class(spa) : spa_normal_class(spa), vd); 754 } 755 756 if (vd->vdev_ops->vdev_op_leaf && 757 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 758 (void) nvlist_lookup_uint64(nv, 759 ZPOOL_CONFIG_VDEV_LEAF_ZAP, &vd->vdev_leaf_zap); 760 } else { 761 ASSERT0(vd->vdev_leaf_zap); 762 } 763 764 /* 765 * If we're a leaf vdev, try to load the DTL object and other state. 766 */ 767 768 if (vd->vdev_ops->vdev_op_leaf && 769 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 770 alloctype == VDEV_ALLOC_ROOTPOOL)) { 771 if (alloctype == VDEV_ALLOC_LOAD) { 772 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 773 &vd->vdev_dtl_object); 774 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 775 &vd->vdev_unspare); 776 } 777 778 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 779 uint64_t spare = 0; 780 781 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 782 &spare) == 0 && spare) 783 spa_spare_add(vd); 784 } 785 786 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 787 &vd->vdev_offline); 788 789 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, 790 &vd->vdev_resilver_txg); 791 792 /* 793 * When importing a pool, we want to ignore the persistent fault 794 * state, as the diagnosis made on another system may not be 795 * valid in the current context. Local vdevs will 796 * remain in the faulted state. 797 */ 798 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 799 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 800 &vd->vdev_faulted); 801 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 802 &vd->vdev_degraded); 803 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 804 &vd->vdev_removed); 805 806 if (vd->vdev_faulted || vd->vdev_degraded) { 807 char *aux; 808 809 vd->vdev_label_aux = 810 VDEV_AUX_ERR_EXCEEDED; 811 if (nvlist_lookup_string(nv, 812 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 813 strcmp(aux, "external") == 0) 814 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 815 } 816 } 817 } 818 819 /* 820 * Add ourselves to the parent's list of children. 821 */ 822 vdev_add_child(parent, vd); 823 824 *vdp = vd; 825 826 return (0); 827} 828 829void 830vdev_free(vdev_t *vd) 831{ 832 spa_t *spa = vd->vdev_spa; 833 834 /* 835 * vdev_free() implies closing the vdev first. This is simpler than 836 * trying to ensure complicated semantics for all callers. 837 */ 838 vdev_close(vd); 839 840 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 841 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 842 843 /* 844 * Free all children. 845 */ 846 for (int c = 0; c < vd->vdev_children; c++) 847 vdev_free(vd->vdev_child[c]); 848 849 ASSERT(vd->vdev_child == NULL); 850 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 851 852 /* 853 * Discard allocation state. 854 */ 855 if (vd->vdev_mg != NULL) { 856 vdev_metaslab_fini(vd); 857 metaslab_group_destroy(vd->vdev_mg); 858 } 859 860 ASSERT0(vd->vdev_stat.vs_space); 861 ASSERT0(vd->vdev_stat.vs_dspace); 862 ASSERT0(vd->vdev_stat.vs_alloc); 863 864 /* 865 * Remove this vdev from its parent's child list. 866 */ 867 vdev_remove_child(vd->vdev_parent, vd); 868 869 ASSERT(vd->vdev_parent == NULL); 870 871 /* 872 * Clean up vdev structure. 873 */ 874 vdev_queue_fini(vd); 875 vdev_cache_fini(vd); 876 877 if (vd->vdev_path) 878 spa_strfree(vd->vdev_path); 879 if (vd->vdev_devid) 880 spa_strfree(vd->vdev_devid); 881 if (vd->vdev_physpath) 882 spa_strfree(vd->vdev_physpath); 883 if (vd->vdev_fru) 884 spa_strfree(vd->vdev_fru); 885 886 if (vd->vdev_isspare) 887 spa_spare_remove(vd); 888 if (vd->vdev_isl2cache) 889 spa_l2cache_remove(vd); 890 891 txg_list_destroy(&vd->vdev_ms_list); 892 txg_list_destroy(&vd->vdev_dtl_list); 893 894 mutex_enter(&vd->vdev_dtl_lock); 895 space_map_close(vd->vdev_dtl_sm); 896 for (int t = 0; t < DTL_TYPES; t++) { 897 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL); 898 range_tree_destroy(vd->vdev_dtl[t]); 899 } 900 mutex_exit(&vd->vdev_dtl_lock); 901 902 EQUIV(vd->vdev_indirect_births != NULL, 903 vd->vdev_indirect_mapping != NULL); 904 if (vd->vdev_indirect_births != NULL) { 905 vdev_indirect_mapping_close(vd->vdev_indirect_mapping); 906 vdev_indirect_births_close(vd->vdev_indirect_births); 907 } 908 909 if (vd->vdev_obsolete_sm != NULL) { 910 ASSERT(vd->vdev_removing || 911 vd->vdev_ops == &vdev_indirect_ops); 912 space_map_close(vd->vdev_obsolete_sm); 913 vd->vdev_obsolete_sm = NULL; 914 } 915 range_tree_destroy(vd->vdev_obsolete_segments); 916 rw_destroy(&vd->vdev_indirect_rwlock); 917 mutex_destroy(&vd->vdev_obsolete_lock); 918 919 mutex_destroy(&vd->vdev_queue_lock); 920 mutex_destroy(&vd->vdev_dtl_lock); 921 mutex_destroy(&vd->vdev_stat_lock); 922 mutex_destroy(&vd->vdev_probe_lock); 923 924 if (vd == spa->spa_root_vdev) 925 spa->spa_root_vdev = NULL; 926 927 kmem_free(vd, sizeof (vdev_t)); 928} 929 930/* 931 * Transfer top-level vdev state from svd to tvd. 932 */ 933static void 934vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 935{ 936 spa_t *spa = svd->vdev_spa; 937 metaslab_t *msp; 938 vdev_t *vd; 939 int t; 940 941 ASSERT(tvd == tvd->vdev_top); 942 943 tvd->vdev_ms_array = svd->vdev_ms_array; 944 tvd->vdev_ms_shift = svd->vdev_ms_shift; 945 tvd->vdev_ms_count = svd->vdev_ms_count; 946 tvd->vdev_top_zap = svd->vdev_top_zap; 947 948 svd->vdev_ms_array = 0; 949 svd->vdev_ms_shift = 0; 950 svd->vdev_ms_count = 0; 951 svd->vdev_top_zap = 0; 952 953 if (tvd->vdev_mg) 954 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg); 955 tvd->vdev_mg = svd->vdev_mg; 956 tvd->vdev_ms = svd->vdev_ms; 957 958 svd->vdev_mg = NULL; 959 svd->vdev_ms = NULL; 960 961 if (tvd->vdev_mg != NULL) 962 tvd->vdev_mg->mg_vd = tvd; 963 964 tvd->vdev_checkpoint_sm = svd->vdev_checkpoint_sm; 965 svd->vdev_checkpoint_sm = NULL; 966 967 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 968 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 969 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 970 971 svd->vdev_stat.vs_alloc = 0; 972 svd->vdev_stat.vs_space = 0; 973 svd->vdev_stat.vs_dspace = 0; 974 975 for (t = 0; t < TXG_SIZE; t++) { 976 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 977 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 978 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 979 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 980 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 981 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 982 } 983 984 if (list_link_active(&svd->vdev_config_dirty_node)) { 985 vdev_config_clean(svd); 986 vdev_config_dirty(tvd); 987 } 988 989 if (list_link_active(&svd->vdev_state_dirty_node)) { 990 vdev_state_clean(svd); 991 vdev_state_dirty(tvd); 992 } 993 994 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 995 svd->vdev_deflate_ratio = 0; 996 997 tvd->vdev_islog = svd->vdev_islog; 998 svd->vdev_islog = 0; 999} 1000 1001static void 1002vdev_top_update(vdev_t *tvd, vdev_t *vd) 1003{ 1004 if (vd == NULL) 1005 return; 1006 1007 vd->vdev_top = tvd; 1008 1009 for (int c = 0; c < vd->vdev_children; c++) 1010 vdev_top_update(tvd, vd->vdev_child[c]); 1011} 1012 1013/* 1014 * Add a mirror/replacing vdev above an existing vdev. 1015 */ 1016vdev_t * 1017vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 1018{ 1019 spa_t *spa = cvd->vdev_spa; 1020 vdev_t *pvd = cvd->vdev_parent; 1021 vdev_t *mvd; 1022 1023 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1024 1025 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 1026 1027 mvd->vdev_asize = cvd->vdev_asize; 1028 mvd->vdev_min_asize = cvd->vdev_min_asize; 1029 mvd->vdev_max_asize = cvd->vdev_max_asize; 1030 mvd->vdev_psize = cvd->vdev_psize; 1031 mvd->vdev_ashift = cvd->vdev_ashift; 1032 mvd->vdev_logical_ashift = cvd->vdev_logical_ashift; 1033 mvd->vdev_physical_ashift = cvd->vdev_physical_ashift; 1034 mvd->vdev_state = cvd->vdev_state; 1035 mvd->vdev_crtxg = cvd->vdev_crtxg; 1036 1037 vdev_remove_child(pvd, cvd); 1038 vdev_add_child(pvd, mvd); 1039 cvd->vdev_id = mvd->vdev_children; 1040 vdev_add_child(mvd, cvd); 1041 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 1042 1043 if (mvd == mvd->vdev_top) 1044 vdev_top_transfer(cvd, mvd); 1045 1046 return (mvd); 1047} 1048 1049/* 1050 * Remove a 1-way mirror/replacing vdev from the tree. 1051 */ 1052void 1053vdev_remove_parent(vdev_t *cvd) 1054{ 1055 vdev_t *mvd = cvd->vdev_parent; 1056 vdev_t *pvd = mvd->vdev_parent; 1057 1058 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1059 1060 ASSERT(mvd->vdev_children == 1); 1061 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 1062 mvd->vdev_ops == &vdev_replacing_ops || 1063 mvd->vdev_ops == &vdev_spare_ops); 1064 cvd->vdev_ashift = mvd->vdev_ashift; 1065 cvd->vdev_logical_ashift = mvd->vdev_logical_ashift; 1066 cvd->vdev_physical_ashift = mvd->vdev_physical_ashift; 1067 1068 vdev_remove_child(mvd, cvd); 1069 vdev_remove_child(pvd, mvd); 1070 1071 /* 1072 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 1073 * Otherwise, we could have detached an offline device, and when we 1074 * go to import the pool we'll think we have two top-level vdevs, 1075 * instead of a different version of the same top-level vdev. 1076 */ 1077 if (mvd->vdev_top == mvd) { 1078 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 1079 cvd->vdev_orig_guid = cvd->vdev_guid; 1080 cvd->vdev_guid += guid_delta; 1081 cvd->vdev_guid_sum += guid_delta; 1082 } 1083 cvd->vdev_id = mvd->vdev_id; 1084 vdev_add_child(pvd, cvd); 1085 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 1086 1087 if (cvd == cvd->vdev_top) 1088 vdev_top_transfer(mvd, cvd); 1089 1090 ASSERT(mvd->vdev_children == 0); 1091 vdev_free(mvd); 1092} 1093 1094int 1095vdev_metaslab_init(vdev_t *vd, uint64_t txg) 1096{ 1097 spa_t *spa = vd->vdev_spa; 1098 objset_t *mos = spa->spa_meta_objset; 1099 uint64_t m; 1100 uint64_t oldc = vd->vdev_ms_count; 1101 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 1102 metaslab_t **mspp; 1103 int error; 1104 1105 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1106 1107 /* 1108 * This vdev is not being allocated from yet or is a hole. 1109 */ 1110 if (vd->vdev_ms_shift == 0) 1111 return (0); 1112 1113 ASSERT(!vd->vdev_ishole); 1114 1115 ASSERT(oldc <= newc); 1116 1117 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 1118 1119 if (oldc != 0) { 1120 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 1121 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 1122 } 1123 1124 vd->vdev_ms = mspp; 1125 vd->vdev_ms_count = newc; 1126 1127 for (m = oldc; m < newc; m++) { 1128 uint64_t object = 0; 1129 1130 /* 1131 * vdev_ms_array may be 0 if we are creating the "fake" 1132 * metaslabs for an indirect vdev for zdb's leak detection. 1133 * See zdb_leak_init(). 1134 */ 1135 if (txg == 0 && vd->vdev_ms_array != 0) { 1136 error = dmu_read(mos, vd->vdev_ms_array, 1137 m * sizeof (uint64_t), sizeof (uint64_t), &object, 1138 DMU_READ_PREFETCH); 1139 if (error != 0) { 1140 vdev_dbgmsg(vd, "unable to read the metaslab " 1141 "array [error=%d]", error); 1142 return (error); 1143 } 1144 } 1145 1146 error = metaslab_init(vd->vdev_mg, m, object, txg, 1147 &(vd->vdev_ms[m])); 1148 if (error != 0) { 1149 vdev_dbgmsg(vd, "metaslab_init failed [error=%d]", 1150 error); 1151 return (error); 1152 } 1153 } 1154 1155 if (txg == 0) 1156 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 1157 1158 /* 1159 * If the vdev is being removed we don't activate 1160 * the metaslabs since we want to ensure that no new 1161 * allocations are performed on this device. 1162 */ 1163 if (oldc == 0 && !vd->vdev_removing) 1164 metaslab_group_activate(vd->vdev_mg); 1165 1166 if (txg == 0) 1167 spa_config_exit(spa, SCL_ALLOC, FTAG); 1168 1169 return (0); 1170} 1171 1172void 1173vdev_metaslab_fini(vdev_t *vd) 1174{ 1175 if (vd->vdev_checkpoint_sm != NULL) { 1176 ASSERT(spa_feature_is_active(vd->vdev_spa, 1177 SPA_FEATURE_POOL_CHECKPOINT)); 1178 space_map_close(vd->vdev_checkpoint_sm); 1179 /* 1180 * Even though we close the space map, we need to set its 1181 * pointer to NULL. The reason is that vdev_metaslab_fini() 1182 * may be called multiple times for certain operations 1183 * (i.e. when destroying a pool) so we need to ensure that 1184 * this clause never executes twice. This logic is similar 1185 * to the one used for the vdev_ms clause below. 1186 */ 1187 vd->vdev_checkpoint_sm = NULL; 1188 } 1189 1190 if (vd->vdev_ms != NULL) { 1191 uint64_t count = vd->vdev_ms_count; 1192 1193 metaslab_group_passivate(vd->vdev_mg); 1194 for (uint64_t m = 0; m < count; m++) { 1195 metaslab_t *msp = vd->vdev_ms[m]; 1196 1197 if (msp != NULL) 1198 metaslab_fini(msp); 1199 } 1200 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 1201 vd->vdev_ms = NULL; 1202 1203 vd->vdev_ms_count = 0; 1204 } 1205 ASSERT0(vd->vdev_ms_count); 1206} 1207 1208typedef struct vdev_probe_stats { 1209 boolean_t vps_readable; 1210 boolean_t vps_writeable; 1211 int vps_flags; 1212} vdev_probe_stats_t; 1213 1214static void 1215vdev_probe_done(zio_t *zio) 1216{ 1217 spa_t *spa = zio->io_spa; 1218 vdev_t *vd = zio->io_vd; 1219 vdev_probe_stats_t *vps = zio->io_private; 1220 1221 ASSERT(vd->vdev_probe_zio != NULL); 1222 1223 if (zio->io_type == ZIO_TYPE_READ) { 1224 if (zio->io_error == 0) 1225 vps->vps_readable = 1; 1226 if (zio->io_error == 0 && spa_writeable(spa)) { 1227 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 1228 zio->io_offset, zio->io_size, zio->io_abd, 1229 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1230 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 1231 } else { 1232 abd_free(zio->io_abd); 1233 } 1234 } else if (zio->io_type == ZIO_TYPE_WRITE) { 1235 if (zio->io_error == 0) 1236 vps->vps_writeable = 1; 1237 abd_free(zio->io_abd); 1238 } else if (zio->io_type == ZIO_TYPE_NULL) { 1239 zio_t *pio; 1240 1241 vd->vdev_cant_read |= !vps->vps_readable; 1242 vd->vdev_cant_write |= !vps->vps_writeable; 1243 1244 if (vdev_readable(vd) && 1245 (vdev_writeable(vd) || !spa_writeable(spa))) { 1246 zio->io_error = 0; 1247 } else { 1248 ASSERT(zio->io_error != 0); 1249 vdev_dbgmsg(vd, "failed probe"); 1250 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 1251 spa, vd, NULL, 0, 0); 1252 zio->io_error = SET_ERROR(ENXIO); 1253 } 1254 1255 mutex_enter(&vd->vdev_probe_lock); 1256 ASSERT(vd->vdev_probe_zio == zio); 1257 vd->vdev_probe_zio = NULL; 1258 mutex_exit(&vd->vdev_probe_lock); 1259 1260 zio_link_t *zl = NULL; 1261 while ((pio = zio_walk_parents(zio, &zl)) != NULL) 1262 if (!vdev_accessible(vd, pio)) 1263 pio->io_error = SET_ERROR(ENXIO); 1264 1265 kmem_free(vps, sizeof (*vps)); 1266 } 1267} 1268 1269/* 1270 * Determine whether this device is accessible. 1271 * 1272 * Read and write to several known locations: the pad regions of each 1273 * vdev label but the first, which we leave alone in case it contains 1274 * a VTOC. 1275 */ 1276zio_t * 1277vdev_probe(vdev_t *vd, zio_t *zio) 1278{ 1279 spa_t *spa = vd->vdev_spa; 1280 vdev_probe_stats_t *vps = NULL; 1281 zio_t *pio; 1282 1283 ASSERT(vd->vdev_ops->vdev_op_leaf); 1284 1285 /* 1286 * Don't probe the probe. 1287 */ 1288 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 1289 return (NULL); 1290 1291 /* 1292 * To prevent 'probe storms' when a device fails, we create 1293 * just one probe i/o at a time. All zios that want to probe 1294 * this vdev will become parents of the probe io. 1295 */ 1296 mutex_enter(&vd->vdev_probe_lock); 1297 1298 if ((pio = vd->vdev_probe_zio) == NULL) { 1299 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 1300 1301 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 1302 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 1303 ZIO_FLAG_TRYHARD; 1304 1305 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 1306 /* 1307 * vdev_cant_read and vdev_cant_write can only 1308 * transition from TRUE to FALSE when we have the 1309 * SCL_ZIO lock as writer; otherwise they can only 1310 * transition from FALSE to TRUE. This ensures that 1311 * any zio looking at these values can assume that 1312 * failures persist for the life of the I/O. That's 1313 * important because when a device has intermittent 1314 * connectivity problems, we want to ensure that 1315 * they're ascribed to the device (ENXIO) and not 1316 * the zio (EIO). 1317 * 1318 * Since we hold SCL_ZIO as writer here, clear both 1319 * values so the probe can reevaluate from first 1320 * principles. 1321 */ 1322 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1323 vd->vdev_cant_read = B_FALSE; 1324 vd->vdev_cant_write = B_FALSE; 1325 } 1326 1327 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1328 vdev_probe_done, vps, 1329 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1330 1331 /* 1332 * We can't change the vdev state in this context, so we 1333 * kick off an async task to do it on our behalf. 1334 */ 1335 if (zio != NULL) { 1336 vd->vdev_probe_wanted = B_TRUE; 1337 spa_async_request(spa, SPA_ASYNC_PROBE); 1338 } 1339 } 1340 1341 if (zio != NULL) 1342 zio_add_child(zio, pio); 1343 1344 mutex_exit(&vd->vdev_probe_lock); 1345 1346 if (vps == NULL) { 1347 ASSERT(zio != NULL); 1348 return (NULL); 1349 } 1350 1351 for (int l = 1; l < VDEV_LABELS; l++) { 1352 zio_nowait(zio_read_phys(pio, vd, 1353 vdev_label_offset(vd->vdev_psize, l, 1354 offsetof(vdev_label_t, vl_pad2)), VDEV_PAD_SIZE, 1355 abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE), 1356 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1357 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1358 } 1359 1360 if (zio == NULL) 1361 return (pio); 1362 1363 zio_nowait(pio); 1364 return (NULL); 1365} 1366 1367static void 1368vdev_open_child(void *arg) 1369{ 1370 vdev_t *vd = arg; 1371 1372 vd->vdev_open_thread = curthread; 1373 vd->vdev_open_error = vdev_open(vd); 1374 vd->vdev_open_thread = NULL; 1375} 1376 1377boolean_t 1378vdev_uses_zvols(vdev_t *vd) 1379{ 1380 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1381 strlen(ZVOL_DIR)) == 0) 1382 return (B_TRUE); 1383 for (int c = 0; c < vd->vdev_children; c++) 1384 if (vdev_uses_zvols(vd->vdev_child[c])) 1385 return (B_TRUE); 1386 return (B_FALSE); 1387} 1388 1389void 1390vdev_open_children(vdev_t *vd) 1391{ 1392 taskq_t *tq; 1393 int children = vd->vdev_children; 1394 1395 /* 1396 * in order to handle pools on top of zvols, do the opens 1397 * in a single thread so that the same thread holds the 1398 * spa_namespace_lock 1399 */ 1400 if (B_TRUE || vdev_uses_zvols(vd)) { 1401 for (int c = 0; c < children; c++) 1402 vd->vdev_child[c]->vdev_open_error = 1403 vdev_open(vd->vdev_child[c]); 1404 return; 1405 } 1406 tq = taskq_create("vdev_open", children, minclsyspri, 1407 children, children, TASKQ_PREPOPULATE); 1408 1409 for (int c = 0; c < children; c++) 1410 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1411 TQ_SLEEP) != 0); 1412 1413 taskq_destroy(tq); 1414} 1415 1416/* 1417 * Compute the raidz-deflation ratio. Note, we hard-code 1418 * in 128k (1 << 17) because it is the "typical" blocksize. 1419 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change, 1420 * otherwise it would inconsistently account for existing bp's. 1421 */ 1422static void 1423vdev_set_deflate_ratio(vdev_t *vd) 1424{ 1425 if (vd == vd->vdev_top && !vd->vdev_ishole && vd->vdev_ashift != 0) { 1426 vd->vdev_deflate_ratio = (1 << 17) / 1427 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 1428 } 1429} 1430 1431/* 1432 * Prepare a virtual device for access. 1433 */ 1434int 1435vdev_open(vdev_t *vd) 1436{ 1437 spa_t *spa = vd->vdev_spa; 1438 int error; 1439 uint64_t osize = 0; 1440 uint64_t max_osize = 0; 1441 uint64_t asize, max_asize, psize; 1442 uint64_t logical_ashift = 0; 1443 uint64_t physical_ashift = 0; 1444 1445 ASSERT(vd->vdev_open_thread == curthread || 1446 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1447 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1448 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1449 vd->vdev_state == VDEV_STATE_OFFLINE); 1450 1451 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1452 vd->vdev_cant_read = B_FALSE; 1453 vd->vdev_cant_write = B_FALSE; 1454 vd->vdev_notrim = B_FALSE; 1455 vd->vdev_min_asize = vdev_get_min_asize(vd); 1456 1457 /* 1458 * If this vdev is not removed, check its fault status. If it's 1459 * faulted, bail out of the open. 1460 */ 1461 if (!vd->vdev_removed && vd->vdev_faulted) { 1462 ASSERT(vd->vdev_children == 0); 1463 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1464 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1465 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1466 vd->vdev_label_aux); 1467 return (SET_ERROR(ENXIO)); 1468 } else if (vd->vdev_offline) { 1469 ASSERT(vd->vdev_children == 0); 1470 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1471 return (SET_ERROR(ENXIO)); 1472 } 1473 1474 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, 1475 &logical_ashift, &physical_ashift); 1476 1477 /* 1478 * Reset the vdev_reopening flag so that we actually close 1479 * the vdev on error. 1480 */ 1481 vd->vdev_reopening = B_FALSE; 1482 if (zio_injection_enabled && error == 0) 1483 error = zio_handle_device_injection(vd, NULL, ENXIO); 1484 1485 if (error) { 1486 if (vd->vdev_removed && 1487 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1488 vd->vdev_removed = B_FALSE; 1489 1490 if (vd->vdev_stat.vs_aux == VDEV_AUX_CHILDREN_OFFLINE) { 1491 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, 1492 vd->vdev_stat.vs_aux); 1493 } else { 1494 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1495 vd->vdev_stat.vs_aux); 1496 } 1497 return (error); 1498 } 1499 1500 vd->vdev_removed = B_FALSE; 1501 1502 /* 1503 * Recheck the faulted flag now that we have confirmed that 1504 * the vdev is accessible. If we're faulted, bail. 1505 */ 1506 if (vd->vdev_faulted) { 1507 ASSERT(vd->vdev_children == 0); 1508 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1509 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1510 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1511 vd->vdev_label_aux); 1512 return (SET_ERROR(ENXIO)); 1513 } 1514 1515 if (vd->vdev_degraded) { 1516 ASSERT(vd->vdev_children == 0); 1517 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1518 VDEV_AUX_ERR_EXCEEDED); 1519 } else { 1520 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1521 } 1522 1523 /* 1524 * For hole or missing vdevs we just return success. 1525 */ 1526 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1527 return (0); 1528 1529 if (zfs_trim_enabled && !vd->vdev_notrim && vd->vdev_ops->vdev_op_leaf) 1530 trim_map_create(vd); 1531 1532 for (int c = 0; c < vd->vdev_children; c++) { 1533 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1534 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1535 VDEV_AUX_NONE); 1536 break; 1537 } 1538 } 1539 1540 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1541 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t)); 1542 1543 if (vd->vdev_children == 0) { 1544 if (osize < SPA_MINDEVSIZE) { 1545 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1546 VDEV_AUX_TOO_SMALL); 1547 return (SET_ERROR(EOVERFLOW)); 1548 } 1549 psize = osize; 1550 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1551 max_asize = max_osize - (VDEV_LABEL_START_SIZE + 1552 VDEV_LABEL_END_SIZE); 1553 } else { 1554 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1555 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1556 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1557 VDEV_AUX_TOO_SMALL); 1558 return (SET_ERROR(EOVERFLOW)); 1559 } 1560 psize = 0; 1561 asize = osize; 1562 max_asize = max_osize; 1563 } 1564 1565 vd->vdev_psize = psize; 1566 1567 /* 1568 * Make sure the allocatable size hasn't shrunk too much. 1569 */ 1570 if (asize < vd->vdev_min_asize) { 1571 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1572 VDEV_AUX_BAD_LABEL); 1573 return (SET_ERROR(EINVAL)); 1574 } 1575 1576 vd->vdev_physical_ashift = 1577 MAX(physical_ashift, vd->vdev_physical_ashift); 1578 vd->vdev_logical_ashift = MAX(logical_ashift, vd->vdev_logical_ashift); 1579 vd->vdev_ashift = MAX(vd->vdev_logical_ashift, vd->vdev_ashift); 1580 1581 if (vd->vdev_logical_ashift > SPA_MAXASHIFT) { 1582 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1583 VDEV_AUX_ASHIFT_TOO_BIG); 1584 return (EINVAL); 1585 } 1586 1587 if (vd->vdev_asize == 0) { 1588 /* 1589 * This is the first-ever open, so use the computed values. 1590 * For testing purposes, a higher ashift can be requested. 1591 */ 1592 vd->vdev_asize = asize; 1593 vd->vdev_max_asize = max_asize; 1594 } else { 1595 /* 1596 * Make sure the alignment requirement hasn't increased. 1597 */ 1598 if (vd->vdev_ashift > vd->vdev_top->vdev_ashift && 1599 vd->vdev_ops->vdev_op_leaf) { 1600 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1601 VDEV_AUX_BAD_LABEL); 1602 return (EINVAL); 1603 } 1604 vd->vdev_max_asize = max_asize; 1605 } 1606 1607 /* 1608 * If all children are healthy we update asize if either: 1609 * The asize has increased, due to a device expansion caused by dynamic 1610 * LUN growth or vdev replacement, and automatic expansion is enabled; 1611 * making the additional space available. 1612 * 1613 * The asize has decreased, due to a device shrink usually caused by a 1614 * vdev replace with a smaller device. This ensures that calculations 1615 * based of max_asize and asize e.g. esize are always valid. It's safe 1616 * to do this as we've already validated that asize is greater than 1617 * vdev_min_asize. 1618 */ 1619 if (vd->vdev_state == VDEV_STATE_HEALTHY && 1620 ((asize > vd->vdev_asize && 1621 (vd->vdev_expanding || spa->spa_autoexpand)) || 1622 (asize < vd->vdev_asize))) 1623 vd->vdev_asize = asize; 1624 1625 vdev_set_min_asize(vd); 1626 1627 /* 1628 * Ensure we can issue some IO before declaring the 1629 * vdev open for business. 1630 */ 1631 if (vd->vdev_ops->vdev_op_leaf && 1632 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1633 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1634 VDEV_AUX_ERR_EXCEEDED); 1635 return (error); 1636 } 1637 1638 /* 1639 * Track the min and max ashift values for normal data devices. 1640 */ 1641 if (vd->vdev_top == vd && vd->vdev_ashift != 0 && 1642 !vd->vdev_islog && vd->vdev_aux == NULL) { 1643 if (vd->vdev_ashift > spa->spa_max_ashift) 1644 spa->spa_max_ashift = vd->vdev_ashift; 1645 if (vd->vdev_ashift < spa->spa_min_ashift) 1646 spa->spa_min_ashift = vd->vdev_ashift; 1647 } 1648 1649 /* 1650 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1651 * resilver. But don't do this if we are doing a reopen for a scrub, 1652 * since this would just restart the scrub we are already doing. 1653 */ 1654 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1655 vdev_resilver_needed(vd, NULL, NULL)) 1656 spa_async_request(spa, SPA_ASYNC_RESILVER); 1657 1658 return (0); 1659} 1660 1661/* 1662 * Called once the vdevs are all opened, this routine validates the label 1663 * contents. This needs to be done before vdev_load() so that we don't 1664 * inadvertently do repair I/Os to the wrong device. 1665 * 1666 * This function will only return failure if one of the vdevs indicates that it 1667 * has since been destroyed or exported. This is only possible if 1668 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1669 * will be updated but the function will return 0. 1670 */ 1671int 1672vdev_validate(vdev_t *vd) 1673{ 1674 spa_t *spa = vd->vdev_spa; 1675 nvlist_t *label; 1676 uint64_t guid = 0, aux_guid = 0, top_guid; 1677 uint64_t state; 1678 nvlist_t *nvl; 1679 uint64_t txg; 1680 1681 if (vdev_validate_skip) 1682 return (0); 1683 1684 for (uint64_t c = 0; c < vd->vdev_children; c++) 1685 if (vdev_validate(vd->vdev_child[c]) != 0) 1686 return (SET_ERROR(EBADF)); 1687 1688 /* 1689 * If the device has already failed, or was marked offline, don't do 1690 * any further validation. Otherwise, label I/O will fail and we will 1691 * overwrite the previous state. 1692 */ 1693 if (!vd->vdev_ops->vdev_op_leaf || !vdev_readable(vd)) 1694 return (0); 1695 1696 /* 1697 * If we are performing an extreme rewind, we allow for a label that 1698 * was modified at a point after the current txg. 1699 */ 1700 if (spa->spa_extreme_rewind || spa_last_synced_txg(spa) == 0) 1701 txg = UINT64_MAX; 1702 else 1703 txg = spa_last_synced_txg(spa); 1704 1705 if ((label = vdev_label_read_config(vd, txg)) == NULL) { 1706 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1707 VDEV_AUX_BAD_LABEL); 1708 vdev_dbgmsg(vd, "vdev_validate: failed reading config"); 1709 return (0); 1710 } 1711 1712 /* 1713 * Determine if this vdev has been split off into another 1714 * pool. If so, then refuse to open it. 1715 */ 1716 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1717 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1718 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1719 VDEV_AUX_SPLIT_POOL); 1720 nvlist_free(label); 1721 vdev_dbgmsg(vd, "vdev_validate: vdev split into other pool"); 1722 return (0); 1723 } 1724 1725 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, &guid) != 0) { 1726 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1727 VDEV_AUX_CORRUPT_DATA); 1728 nvlist_free(label); 1729 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1730 ZPOOL_CONFIG_POOL_GUID); 1731 return (0); 1732 } 1733 1734 /* 1735 * If config is not trusted then ignore the spa guid check. This is 1736 * necessary because if the machine crashed during a re-guid the new 1737 * guid might have been written to all of the vdev labels, but not the 1738 * cached config. The check will be performed again once we have the 1739 * trusted config from the MOS. 1740 */ 1741 if (spa->spa_trust_config && guid != spa_guid(spa)) { 1742 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1743 VDEV_AUX_CORRUPT_DATA); 1744 nvlist_free(label); 1745 vdev_dbgmsg(vd, "vdev_validate: vdev label pool_guid doesn't " 1746 "match config (%llu != %llu)", (u_longlong_t)guid, 1747 (u_longlong_t)spa_guid(spa)); 1748 return (0); 1749 } 1750 1751 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1752 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1753 &aux_guid) != 0) 1754 aux_guid = 0; 1755 1756 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0) { 1757 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1758 VDEV_AUX_CORRUPT_DATA); 1759 nvlist_free(label); 1760 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1761 ZPOOL_CONFIG_GUID); 1762 return (0); 1763 } 1764 1765 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, &top_guid) 1766 != 0) { 1767 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1768 VDEV_AUX_CORRUPT_DATA); 1769 nvlist_free(label); 1770 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1771 ZPOOL_CONFIG_TOP_GUID); 1772 return (0); 1773 } 1774 1775 /* 1776 * If this vdev just became a top-level vdev because its sibling was 1777 * detached, it will have adopted the parent's vdev guid -- but the 1778 * label may or may not be on disk yet. Fortunately, either version 1779 * of the label will have the same top guid, so if we're a top-level 1780 * vdev, we can safely compare to that instead. 1781 * However, if the config comes from a cachefile that failed to update 1782 * after the detach, a top-level vdev will appear as a non top-level 1783 * vdev in the config. Also relax the constraints if we perform an 1784 * extreme rewind. 1785 * 1786 * If we split this vdev off instead, then we also check the 1787 * original pool's guid. We don't want to consider the vdev 1788 * corrupt if it is partway through a split operation. 1789 */ 1790 if (vd->vdev_guid != guid && vd->vdev_guid != aux_guid) { 1791 boolean_t mismatch = B_FALSE; 1792 if (spa->spa_trust_config && !spa->spa_extreme_rewind) { 1793 if (vd != vd->vdev_top || vd->vdev_guid != top_guid) 1794 mismatch = B_TRUE; 1795 } else { 1796 if (vd->vdev_guid != top_guid && 1797 vd->vdev_top->vdev_guid != guid) 1798 mismatch = B_TRUE; 1799 } 1800 1801 if (mismatch) { 1802 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1803 VDEV_AUX_CORRUPT_DATA); 1804 nvlist_free(label); 1805 vdev_dbgmsg(vd, "vdev_validate: config guid " 1806 "doesn't match label guid"); 1807 vdev_dbgmsg(vd, "CONFIG: guid %llu, top_guid %llu", 1808 (u_longlong_t)vd->vdev_guid, 1809 (u_longlong_t)vd->vdev_top->vdev_guid); 1810 vdev_dbgmsg(vd, "LABEL: guid %llu, top_guid %llu, " 1811 "aux_guid %llu", (u_longlong_t)guid, 1812 (u_longlong_t)top_guid, (u_longlong_t)aux_guid); 1813 return (0); 1814 } 1815 } 1816 1817 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1818 &state) != 0) { 1819 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1820 VDEV_AUX_CORRUPT_DATA); 1821 nvlist_free(label); 1822 vdev_dbgmsg(vd, "vdev_validate: '%s' missing from label", 1823 ZPOOL_CONFIG_POOL_STATE); 1824 return (0); 1825 } 1826 1827 nvlist_free(label); 1828 1829 /* 1830 * If this is a verbatim import, no need to check the 1831 * state of the pool. 1832 */ 1833 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1834 spa_load_state(spa) == SPA_LOAD_OPEN && 1835 state != POOL_STATE_ACTIVE) { 1836 vdev_dbgmsg(vd, "vdev_validate: invalid pool state (%llu) " 1837 "for spa %s", (u_longlong_t)state, spa->spa_name); 1838 return (SET_ERROR(EBADF)); 1839 } 1840 1841 /* 1842 * If we were able to open and validate a vdev that was 1843 * previously marked permanently unavailable, clear that state 1844 * now. 1845 */ 1846 if (vd->vdev_not_present) 1847 vd->vdev_not_present = 0; 1848 1849 return (0); 1850} 1851 1852static void 1853vdev_copy_path_impl(vdev_t *svd, vdev_t *dvd) 1854{ 1855 if (svd->vdev_path != NULL && dvd->vdev_path != NULL) { 1856 if (strcmp(svd->vdev_path, dvd->vdev_path) != 0) { 1857 zfs_dbgmsg("vdev_copy_path: vdev %llu: path changed " 1858 "from '%s' to '%s'", (u_longlong_t)dvd->vdev_guid, 1859 dvd->vdev_path, svd->vdev_path); 1860 spa_strfree(dvd->vdev_path); 1861 dvd->vdev_path = spa_strdup(svd->vdev_path); 1862 } 1863 } else if (svd->vdev_path != NULL) { 1864 dvd->vdev_path = spa_strdup(svd->vdev_path); 1865 zfs_dbgmsg("vdev_copy_path: vdev %llu: path set to '%s'", 1866 (u_longlong_t)dvd->vdev_guid, dvd->vdev_path); 1867 } 1868} 1869 1870/* 1871 * Recursively copy vdev paths from one vdev to another. Source and destination 1872 * vdev trees must have same geometry otherwise return error. Intended to copy 1873 * paths from userland config into MOS config. 1874 */ 1875int 1876vdev_copy_path_strict(vdev_t *svd, vdev_t *dvd) 1877{ 1878 if ((svd->vdev_ops == &vdev_missing_ops) || 1879 (svd->vdev_ishole && dvd->vdev_ishole) || 1880 (dvd->vdev_ops == &vdev_indirect_ops)) 1881 return (0); 1882 1883 if (svd->vdev_ops != dvd->vdev_ops) { 1884 vdev_dbgmsg(svd, "vdev_copy_path: vdev type mismatch: %s != %s", 1885 svd->vdev_ops->vdev_op_type, dvd->vdev_ops->vdev_op_type); 1886 return (SET_ERROR(EINVAL)); 1887 } 1888 1889 if (svd->vdev_guid != dvd->vdev_guid) { 1890 vdev_dbgmsg(svd, "vdev_copy_path: guids mismatch (%llu != " 1891 "%llu)", (u_longlong_t)svd->vdev_guid, 1892 (u_longlong_t)dvd->vdev_guid); 1893 return (SET_ERROR(EINVAL)); 1894 } 1895 1896 if (svd->vdev_children != dvd->vdev_children) { 1897 vdev_dbgmsg(svd, "vdev_copy_path: children count mismatch: " 1898 "%llu != %llu", (u_longlong_t)svd->vdev_children, 1899 (u_longlong_t)dvd->vdev_children); 1900 return (SET_ERROR(EINVAL)); 1901 } 1902 1903 for (uint64_t i = 0; i < svd->vdev_children; i++) { 1904 int error = vdev_copy_path_strict(svd->vdev_child[i], 1905 dvd->vdev_child[i]); 1906 if (error != 0) 1907 return (error); 1908 } 1909 1910 if (svd->vdev_ops->vdev_op_leaf) 1911 vdev_copy_path_impl(svd, dvd); 1912 1913 return (0); 1914} 1915 1916static void 1917vdev_copy_path_search(vdev_t *stvd, vdev_t *dvd) 1918{ 1919 ASSERT(stvd->vdev_top == stvd); 1920 ASSERT3U(stvd->vdev_id, ==, dvd->vdev_top->vdev_id); 1921 1922 for (uint64_t i = 0; i < dvd->vdev_children; i++) { 1923 vdev_copy_path_search(stvd, dvd->vdev_child[i]); 1924 } 1925 1926 if (!dvd->vdev_ops->vdev_op_leaf || !vdev_is_concrete(dvd)) 1927 return; 1928 1929 /* 1930 * The idea here is that while a vdev can shift positions within 1931 * a top vdev (when replacing, attaching mirror, etc.) it cannot 1932 * step outside of it. 1933 */ 1934 vdev_t *vd = vdev_lookup_by_guid(stvd, dvd->vdev_guid); 1935 1936 if (vd == NULL || vd->vdev_ops != dvd->vdev_ops) 1937 return; 1938 1939 ASSERT(vd->vdev_ops->vdev_op_leaf); 1940 1941 vdev_copy_path_impl(vd, dvd); 1942} 1943 1944/* 1945 * Recursively copy vdev paths from one root vdev to another. Source and 1946 * destination vdev trees may differ in geometry. For each destination leaf 1947 * vdev, search a vdev with the same guid and top vdev id in the source. 1948 * Intended to copy paths from userland config into MOS config. 1949 */ 1950void 1951vdev_copy_path_relaxed(vdev_t *srvd, vdev_t *drvd) 1952{ 1953 uint64_t children = MIN(srvd->vdev_children, drvd->vdev_children); 1954 ASSERT(srvd->vdev_ops == &vdev_root_ops); 1955 ASSERT(drvd->vdev_ops == &vdev_root_ops); 1956 1957 for (uint64_t i = 0; i < children; i++) { 1958 vdev_copy_path_search(srvd->vdev_child[i], 1959 drvd->vdev_child[i]); 1960 } 1961} 1962 1963/* 1964 * Close a virtual device. 1965 */ 1966void 1967vdev_close(vdev_t *vd) 1968{ 1969 spa_t *spa = vd->vdev_spa; 1970 vdev_t *pvd = vd->vdev_parent; 1971 1972 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1973 1974 /* 1975 * If our parent is reopening, then we are as well, unless we are 1976 * going offline. 1977 */ 1978 if (pvd != NULL && pvd->vdev_reopening) 1979 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1980 1981 vd->vdev_ops->vdev_op_close(vd); 1982 1983 vdev_cache_purge(vd); 1984 1985 if (vd->vdev_ops->vdev_op_leaf) 1986 trim_map_destroy(vd); 1987 1988 /* 1989 * We record the previous state before we close it, so that if we are 1990 * doing a reopen(), we don't generate FMA ereports if we notice that 1991 * it's still faulted. 1992 */ 1993 vd->vdev_prevstate = vd->vdev_state; 1994 1995 if (vd->vdev_offline) 1996 vd->vdev_state = VDEV_STATE_OFFLINE; 1997 else 1998 vd->vdev_state = VDEV_STATE_CLOSED; 1999 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 2000} 2001 2002void 2003vdev_hold(vdev_t *vd) 2004{ 2005 spa_t *spa = vd->vdev_spa; 2006 2007 ASSERT(spa_is_root(spa)); 2008 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 2009 return; 2010 2011 for (int c = 0; c < vd->vdev_children; c++) 2012 vdev_hold(vd->vdev_child[c]); 2013 2014 if (vd->vdev_ops->vdev_op_leaf) 2015 vd->vdev_ops->vdev_op_hold(vd); 2016} 2017 2018void 2019vdev_rele(vdev_t *vd) 2020{ 2021 spa_t *spa = vd->vdev_spa; 2022 2023 ASSERT(spa_is_root(spa)); 2024 for (int c = 0; c < vd->vdev_children; c++) 2025 vdev_rele(vd->vdev_child[c]); 2026 2027 if (vd->vdev_ops->vdev_op_leaf) 2028 vd->vdev_ops->vdev_op_rele(vd); 2029} 2030 2031/* 2032 * Reopen all interior vdevs and any unopened leaves. We don't actually 2033 * reopen leaf vdevs which had previously been opened as they might deadlock 2034 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 2035 * If the leaf has never been opened then open it, as usual. 2036 */ 2037void 2038vdev_reopen(vdev_t *vd) 2039{ 2040 spa_t *spa = vd->vdev_spa; 2041 2042 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2043 2044 /* set the reopening flag unless we're taking the vdev offline */ 2045 vd->vdev_reopening = !vd->vdev_offline; 2046 vdev_close(vd); 2047 (void) vdev_open(vd); 2048 2049 /* 2050 * Call vdev_validate() here to make sure we have the same device. 2051 * Otherwise, a device with an invalid label could be successfully 2052 * opened in response to vdev_reopen(). 2053 */ 2054 if (vd->vdev_aux) { 2055 (void) vdev_validate_aux(vd); 2056 if (vdev_readable(vd) && vdev_writeable(vd) && 2057 vd->vdev_aux == &spa->spa_l2cache && 2058 !l2arc_vdev_present(vd)) 2059 l2arc_add_vdev(spa, vd); 2060 } else { 2061 (void) vdev_validate(vd); 2062 } 2063 2064 /* 2065 * Reassess parent vdev's health. 2066 */ 2067 vdev_propagate_state(vd); 2068} 2069 2070int 2071vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 2072{ 2073 int error; 2074 2075 /* 2076 * Normally, partial opens (e.g. of a mirror) are allowed. 2077 * For a create, however, we want to fail the request if 2078 * there are any components we can't open. 2079 */ 2080 error = vdev_open(vd); 2081 2082 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 2083 vdev_close(vd); 2084 return (error ? error : ENXIO); 2085 } 2086 2087 /* 2088 * Recursively load DTLs and initialize all labels. 2089 */ 2090 if ((error = vdev_dtl_load(vd)) != 0 || 2091 (error = vdev_label_init(vd, txg, isreplacing ? 2092 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 2093 vdev_close(vd); 2094 return (error); 2095 } 2096 2097 return (0); 2098} 2099 2100void 2101vdev_metaslab_set_size(vdev_t *vd) 2102{ 2103 uint64_t asize = vd->vdev_asize; 2104 uint64_t ms_shift = 0; 2105 2106 /* 2107 * For vdevs that are bigger than 8G the metaslab size varies in 2108 * a way that the number of metaslabs increases in powers of two, 2109 * linearly in terms of vdev_asize, starting from 16 metaslabs. 2110 * So for vdev_asize of 8G we get 16 metaslabs, for 16G, we get 32, 2111 * and so on, until we hit the maximum metaslab count limit 2112 * [vdev_max_ms_count] from which point the metaslab count stays 2113 * the same. 2114 */ 2115 ms_shift = vdev_default_ms_shift; 2116 2117 if ((asize >> ms_shift) < vdev_min_ms_count) { 2118 /* 2119 * For devices that are less than 8G we want to have 2120 * exactly 16 metaslabs. We don't want less as integer 2121 * division rounds down, so less metaslabs mean more 2122 * wasted space. We don't want more as these vdevs are 2123 * small and in the likely event that we are running 2124 * out of space, the SPA will have a hard time finding 2125 * space due to fragmentation. 2126 */ 2127 ms_shift = highbit64(asize / vdev_min_ms_count); 2128 ms_shift = MAX(ms_shift, SPA_MAXBLOCKSHIFT); 2129 2130 } else if ((asize >> ms_shift) > vdev_max_ms_count) { 2131 ms_shift = highbit64(asize / vdev_max_ms_count); 2132 } 2133 2134 vd->vdev_ms_shift = ms_shift; 2135 ASSERT3U(vd->vdev_ms_shift, >=, SPA_MAXBLOCKSHIFT); 2136} 2137 2138/* 2139 * Maximize performance by inflating the configured ashift for top level 2140 * vdevs to be as close to the physical ashift as possible while maintaining 2141 * administrator defined limits and ensuring it doesn't go below the 2142 * logical ashift. 2143 */ 2144void 2145vdev_ashift_optimize(vdev_t *vd) 2146{ 2147 if (vd == vd->vdev_top) { 2148 if (vd->vdev_ashift < vd->vdev_physical_ashift) { 2149 vd->vdev_ashift = MIN( 2150 MAX(zfs_max_auto_ashift, vd->vdev_ashift), 2151 MAX(zfs_min_auto_ashift, vd->vdev_physical_ashift)); 2152 } else { 2153 /* 2154 * Unusual case where logical ashift > physical ashift 2155 * so we can't cap the calculated ashift based on max 2156 * ashift as that would cause failures. 2157 * We still check if we need to increase it to match 2158 * the min ashift. 2159 */ 2160 vd->vdev_ashift = MAX(zfs_min_auto_ashift, 2161 vd->vdev_ashift); 2162 } 2163 } 2164} 2165 2166void 2167vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 2168{ 2169 ASSERT(vd == vd->vdev_top); 2170 /* indirect vdevs don't have metaslabs or dtls */ 2171 ASSERT(vdev_is_concrete(vd) || flags == 0); 2172 ASSERT(ISP2(flags)); 2173 ASSERT(spa_writeable(vd->vdev_spa)); 2174 2175 if (flags & VDD_METASLAB) 2176 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 2177 2178 if (flags & VDD_DTL) 2179 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 2180 2181 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 2182} 2183 2184void 2185vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg) 2186{ 2187 for (int c = 0; c < vd->vdev_children; c++) 2188 vdev_dirty_leaves(vd->vdev_child[c], flags, txg); 2189 2190 if (vd->vdev_ops->vdev_op_leaf) 2191 vdev_dirty(vd->vdev_top, flags, vd, txg); 2192} 2193 2194/* 2195 * DTLs. 2196 * 2197 * A vdev's DTL (dirty time log) is the set of transaction groups for which 2198 * the vdev has less than perfect replication. There are four kinds of DTL: 2199 * 2200 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 2201 * 2202 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 2203 * 2204 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 2205 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 2206 * txgs that was scrubbed. 2207 * 2208 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 2209 * persistent errors or just some device being offline. 2210 * Unlike the other three, the DTL_OUTAGE map is not generally 2211 * maintained; it's only computed when needed, typically to 2212 * determine whether a device can be detached. 2213 * 2214 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 2215 * either has the data or it doesn't. 2216 * 2217 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 2218 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 2219 * if any child is less than fully replicated, then so is its parent. 2220 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 2221 * comprising only those txgs which appear in 'maxfaults' or more children; 2222 * those are the txgs we don't have enough replication to read. For example, 2223 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 2224 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 2225 * two child DTL_MISSING maps. 2226 * 2227 * It should be clear from the above that to compute the DTLs and outage maps 2228 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 2229 * Therefore, that is all we keep on disk. When loading the pool, or after 2230 * a configuration change, we generate all other DTLs from first principles. 2231 */ 2232void 2233vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 2234{ 2235 range_tree_t *rt = vd->vdev_dtl[t]; 2236 2237 ASSERT(t < DTL_TYPES); 2238 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 2239 ASSERT(spa_writeable(vd->vdev_spa)); 2240 2241 mutex_enter(&vd->vdev_dtl_lock); 2242 if (!range_tree_contains(rt, txg, size)) 2243 range_tree_add(rt, txg, size); 2244 mutex_exit(&vd->vdev_dtl_lock); 2245} 2246 2247boolean_t 2248vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 2249{ 2250 range_tree_t *rt = vd->vdev_dtl[t]; 2251 boolean_t dirty = B_FALSE; 2252 2253 ASSERT(t < DTL_TYPES); 2254 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 2255 2256 /* 2257 * While we are loading the pool, the DTLs have not been loaded yet. 2258 * Ignore the DTLs and try all devices. This avoids a recursive 2259 * mutex enter on the vdev_dtl_lock, and also makes us try hard 2260 * when loading the pool (relying on the checksum to ensure that 2261 * we get the right data -- note that we while loading, we are 2262 * only reading the MOS, which is always checksummed). 2263 */ 2264 if (vd->vdev_spa->spa_load_state != SPA_LOAD_NONE) 2265 return (B_FALSE); 2266 2267 mutex_enter(&vd->vdev_dtl_lock); 2268 if (!range_tree_is_empty(rt)) 2269 dirty = range_tree_contains(rt, txg, size); 2270 mutex_exit(&vd->vdev_dtl_lock); 2271 2272 return (dirty); 2273} 2274 2275boolean_t 2276vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 2277{ 2278 range_tree_t *rt = vd->vdev_dtl[t]; 2279 boolean_t empty; 2280 2281 mutex_enter(&vd->vdev_dtl_lock); 2282 empty = range_tree_is_empty(rt); 2283 mutex_exit(&vd->vdev_dtl_lock); 2284 2285 return (empty); 2286} 2287 2288/* 2289 * Returns the lowest txg in the DTL range. 2290 */ 2291static uint64_t 2292vdev_dtl_min(vdev_t *vd) 2293{ 2294 range_seg_t *rs; 2295 2296 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 2297 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 2298 ASSERT0(vd->vdev_children); 2299 2300 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root); 2301 return (rs->rs_start - 1); 2302} 2303 2304/* 2305 * Returns the highest txg in the DTL. 2306 */ 2307static uint64_t 2308vdev_dtl_max(vdev_t *vd) 2309{ 2310 range_seg_t *rs; 2311 2312 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock)); 2313 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0); 2314 ASSERT0(vd->vdev_children); 2315 2316 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root); 2317 return (rs->rs_end); 2318} 2319 2320/* 2321 * Determine if a resilvering vdev should remove any DTL entries from 2322 * its range. If the vdev was resilvering for the entire duration of the 2323 * scan then it should excise that range from its DTLs. Otherwise, this 2324 * vdev is considered partially resilvered and should leave its DTL 2325 * entries intact. The comment in vdev_dtl_reassess() describes how we 2326 * excise the DTLs. 2327 */ 2328static boolean_t 2329vdev_dtl_should_excise(vdev_t *vd) 2330{ 2331 spa_t *spa = vd->vdev_spa; 2332 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 2333 2334 ASSERT0(scn->scn_phys.scn_errors); 2335 ASSERT0(vd->vdev_children); 2336 2337 if (vd->vdev_state < VDEV_STATE_DEGRADED) 2338 return (B_FALSE); 2339 2340 if (vd->vdev_resilver_txg == 0 || 2341 range_tree_is_empty(vd->vdev_dtl[DTL_MISSING])) 2342 return (B_TRUE); 2343 2344 /* 2345 * When a resilver is initiated the scan will assign the scn_max_txg 2346 * value to the highest txg value that exists in all DTLs. If this 2347 * device's max DTL is not part of this scan (i.e. it is not in 2348 * the range (scn_min_txg, scn_max_txg] then it is not eligible 2349 * for excision. 2350 */ 2351 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) { 2352 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd)); 2353 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg); 2354 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg); 2355 return (B_TRUE); 2356 } 2357 return (B_FALSE); 2358} 2359 2360/* 2361 * Reassess DTLs after a config change or scrub completion. 2362 */ 2363void 2364vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 2365{ 2366 spa_t *spa = vd->vdev_spa; 2367 avl_tree_t reftree; 2368 int minref; 2369 2370 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 2371 2372 for (int c = 0; c < vd->vdev_children; c++) 2373 vdev_dtl_reassess(vd->vdev_child[c], txg, 2374 scrub_txg, scrub_done); 2375 2376 if (vd == spa->spa_root_vdev || !vdev_is_concrete(vd) || vd->vdev_aux) 2377 return; 2378 2379 if (vd->vdev_ops->vdev_op_leaf) { 2380 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 2381 2382 mutex_enter(&vd->vdev_dtl_lock); 2383 2384 /* 2385 * If we've completed a scan cleanly then determine 2386 * if this vdev should remove any DTLs. We only want to 2387 * excise regions on vdevs that were available during 2388 * the entire duration of this scan. 2389 */ 2390 if (scrub_txg != 0 && 2391 (spa->spa_scrub_started || 2392 (scn != NULL && scn->scn_phys.scn_errors == 0)) && 2393 vdev_dtl_should_excise(vd)) { 2394 /* 2395 * We completed a scrub up to scrub_txg. If we 2396 * did it without rebooting, then the scrub dtl 2397 * will be valid, so excise the old region and 2398 * fold in the scrub dtl. Otherwise, leave the 2399 * dtl as-is if there was an error. 2400 * 2401 * There's little trick here: to excise the beginning 2402 * of the DTL_MISSING map, we put it into a reference 2403 * tree and then add a segment with refcnt -1 that 2404 * covers the range [0, scrub_txg). This means 2405 * that each txg in that range has refcnt -1 or 0. 2406 * We then add DTL_SCRUB with a refcnt of 2, so that 2407 * entries in the range [0, scrub_txg) will have a 2408 * positive refcnt -- either 1 or 2. We then convert 2409 * the reference tree into the new DTL_MISSING map. 2410 */ 2411 space_reftree_create(&reftree); 2412 space_reftree_add_map(&reftree, 2413 vd->vdev_dtl[DTL_MISSING], 1); 2414 space_reftree_add_seg(&reftree, 0, scrub_txg, -1); 2415 space_reftree_add_map(&reftree, 2416 vd->vdev_dtl[DTL_SCRUB], 2); 2417 space_reftree_generate_map(&reftree, 2418 vd->vdev_dtl[DTL_MISSING], 1); 2419 space_reftree_destroy(&reftree); 2420 } 2421 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 2422 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 2423 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]); 2424 if (scrub_done) 2425 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 2426 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 2427 if (!vdev_readable(vd)) 2428 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 2429 else 2430 range_tree_walk(vd->vdev_dtl[DTL_MISSING], 2431 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]); 2432 2433 /* 2434 * If the vdev was resilvering and no longer has any 2435 * DTLs then reset its resilvering flag and dirty 2436 * the top level so that we persist the change. 2437 */ 2438 if (vd->vdev_resilver_txg != 0 && 2439 range_tree_is_empty(vd->vdev_dtl[DTL_MISSING]) && 2440 range_tree_is_empty(vd->vdev_dtl[DTL_OUTAGE])) { 2441 vd->vdev_resilver_txg = 0; 2442 vdev_config_dirty(vd->vdev_top); 2443 } 2444 2445 mutex_exit(&vd->vdev_dtl_lock); 2446 2447 if (txg != 0) 2448 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 2449 return; 2450 } 2451 2452 mutex_enter(&vd->vdev_dtl_lock); 2453 for (int t = 0; t < DTL_TYPES; t++) { 2454 /* account for child's outage in parent's missing map */ 2455 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 2456 if (t == DTL_SCRUB) 2457 continue; /* leaf vdevs only */ 2458 if (t == DTL_PARTIAL) 2459 minref = 1; /* i.e. non-zero */ 2460 else if (vd->vdev_nparity != 0) 2461 minref = vd->vdev_nparity + 1; /* RAID-Z */ 2462 else 2463 minref = vd->vdev_children; /* any kind of mirror */ 2464 space_reftree_create(&reftree); 2465 for (int c = 0; c < vd->vdev_children; c++) { 2466 vdev_t *cvd = vd->vdev_child[c]; 2467 mutex_enter(&cvd->vdev_dtl_lock); 2468 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1); 2469 mutex_exit(&cvd->vdev_dtl_lock); 2470 } 2471 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref); 2472 space_reftree_destroy(&reftree); 2473 } 2474 mutex_exit(&vd->vdev_dtl_lock); 2475} 2476 2477int 2478vdev_dtl_load(vdev_t *vd) 2479{ 2480 spa_t *spa = vd->vdev_spa; 2481 objset_t *mos = spa->spa_meta_objset; 2482 int error = 0; 2483 2484 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) { 2485 ASSERT(vdev_is_concrete(vd)); 2486 2487 error = space_map_open(&vd->vdev_dtl_sm, mos, 2488 vd->vdev_dtl_object, 0, -1ULL, 0); 2489 if (error) 2490 return (error); 2491 ASSERT(vd->vdev_dtl_sm != NULL); 2492 2493 mutex_enter(&vd->vdev_dtl_lock); 2494 2495 /* 2496 * Now that we've opened the space_map we need to update 2497 * the in-core DTL. 2498 */ 2499 space_map_update(vd->vdev_dtl_sm); 2500 2501 error = space_map_load(vd->vdev_dtl_sm, 2502 vd->vdev_dtl[DTL_MISSING], SM_ALLOC); 2503 mutex_exit(&vd->vdev_dtl_lock); 2504 2505 return (error); 2506 } 2507 2508 for (int c = 0; c < vd->vdev_children; c++) { 2509 error = vdev_dtl_load(vd->vdev_child[c]); 2510 if (error != 0) 2511 break; 2512 } 2513 2514 return (error); 2515} 2516 2517void 2518vdev_destroy_unlink_zap(vdev_t *vd, uint64_t zapobj, dmu_tx_t *tx) 2519{ 2520 spa_t *spa = vd->vdev_spa; 2521 2522 VERIFY0(zap_destroy(spa->spa_meta_objset, zapobj, tx)); 2523 VERIFY0(zap_remove_int(spa->spa_meta_objset, spa->spa_all_vdev_zaps, 2524 zapobj, tx)); 2525} 2526 2527uint64_t 2528vdev_create_link_zap(vdev_t *vd, dmu_tx_t *tx) 2529{ 2530 spa_t *spa = vd->vdev_spa; 2531 uint64_t zap = zap_create(spa->spa_meta_objset, DMU_OTN_ZAP_METADATA, 2532 DMU_OT_NONE, 0, tx); 2533 2534 ASSERT(zap != 0); 2535 VERIFY0(zap_add_int(spa->spa_meta_objset, spa->spa_all_vdev_zaps, 2536 zap, tx)); 2537 2538 return (zap); 2539} 2540 2541void 2542vdev_construct_zaps(vdev_t *vd, dmu_tx_t *tx) 2543{ 2544 if (vd->vdev_ops != &vdev_hole_ops && 2545 vd->vdev_ops != &vdev_missing_ops && 2546 vd->vdev_ops != &vdev_root_ops && 2547 !vd->vdev_top->vdev_removing) { 2548 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_leaf_zap == 0) { 2549 vd->vdev_leaf_zap = vdev_create_link_zap(vd, tx); 2550 } 2551 if (vd == vd->vdev_top && vd->vdev_top_zap == 0) { 2552 vd->vdev_top_zap = vdev_create_link_zap(vd, tx); 2553 } 2554 } 2555 for (uint64_t i = 0; i < vd->vdev_children; i++) { 2556 vdev_construct_zaps(vd->vdev_child[i], tx); 2557 } 2558} 2559 2560void 2561vdev_dtl_sync(vdev_t *vd, uint64_t txg) 2562{ 2563 spa_t *spa = vd->vdev_spa; 2564 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING]; 2565 objset_t *mos = spa->spa_meta_objset; 2566 range_tree_t *rtsync; 2567 dmu_tx_t *tx; 2568 uint64_t object = space_map_object(vd->vdev_dtl_sm); 2569 2570 ASSERT(vdev_is_concrete(vd)); 2571 ASSERT(vd->vdev_ops->vdev_op_leaf); 2572 2573 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2574 2575 if (vd->vdev_detached || vd->vdev_top->vdev_removing) { 2576 mutex_enter(&vd->vdev_dtl_lock); 2577 space_map_free(vd->vdev_dtl_sm, tx); 2578 space_map_close(vd->vdev_dtl_sm); 2579 vd->vdev_dtl_sm = NULL; 2580 mutex_exit(&vd->vdev_dtl_lock); 2581 2582 /* 2583 * We only destroy the leaf ZAP for detached leaves or for 2584 * removed log devices. Removed data devices handle leaf ZAP 2585 * cleanup later, once cancellation is no longer possible. 2586 */ 2587 if (vd->vdev_leaf_zap != 0 && (vd->vdev_detached || 2588 vd->vdev_top->vdev_islog)) { 2589 vdev_destroy_unlink_zap(vd, vd->vdev_leaf_zap, tx); 2590 vd->vdev_leaf_zap = 0; 2591 } 2592 2593 dmu_tx_commit(tx); 2594 return; 2595 } 2596 2597 if (vd->vdev_dtl_sm == NULL) { 2598 uint64_t new_object; 2599 2600 new_object = space_map_alloc(mos, vdev_dtl_sm_blksz, tx); 2601 VERIFY3U(new_object, !=, 0); 2602 2603 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object, 2604 0, -1ULL, 0)); 2605 ASSERT(vd->vdev_dtl_sm != NULL); 2606 } 2607 2608 rtsync = range_tree_create(NULL, NULL); 2609 2610 mutex_enter(&vd->vdev_dtl_lock); 2611 range_tree_walk(rt, range_tree_add, rtsync); 2612 mutex_exit(&vd->vdev_dtl_lock); 2613 2614 space_map_truncate(vd->vdev_dtl_sm, vdev_dtl_sm_blksz, tx); 2615 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx); 2616 range_tree_vacate(rtsync, NULL, NULL); 2617 2618 range_tree_destroy(rtsync); 2619 2620 /* 2621 * If the object for the space map has changed then dirty 2622 * the top level so that we update the config. 2623 */ 2624 if (object != space_map_object(vd->vdev_dtl_sm)) { 2625 vdev_dbgmsg(vd, "txg %llu, spa %s, DTL old object %llu, " 2626 "new object %llu", (u_longlong_t)txg, spa_name(spa), 2627 (u_longlong_t)object, 2628 (u_longlong_t)space_map_object(vd->vdev_dtl_sm)); 2629 vdev_config_dirty(vd->vdev_top); 2630 } 2631 2632 dmu_tx_commit(tx); 2633 2634 mutex_enter(&vd->vdev_dtl_lock); 2635 space_map_update(vd->vdev_dtl_sm); 2636 mutex_exit(&vd->vdev_dtl_lock); 2637} 2638 2639/* 2640 * Determine whether the specified vdev can be offlined/detached/removed 2641 * without losing data. 2642 */ 2643boolean_t 2644vdev_dtl_required(vdev_t *vd) 2645{ 2646 spa_t *spa = vd->vdev_spa; 2647 vdev_t *tvd = vd->vdev_top; 2648 uint8_t cant_read = vd->vdev_cant_read; 2649 boolean_t required; 2650 2651 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2652 2653 if (vd == spa->spa_root_vdev || vd == tvd) 2654 return (B_TRUE); 2655 2656 /* 2657 * Temporarily mark the device as unreadable, and then determine 2658 * whether this results in any DTL outages in the top-level vdev. 2659 * If not, we can safely offline/detach/remove the device. 2660 */ 2661 vd->vdev_cant_read = B_TRUE; 2662 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2663 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 2664 vd->vdev_cant_read = cant_read; 2665 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 2666 2667 if (!required && zio_injection_enabled) 2668 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 2669 2670 return (required); 2671} 2672 2673/* 2674 * Determine if resilver is needed, and if so the txg range. 2675 */ 2676boolean_t 2677vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 2678{ 2679 boolean_t needed = B_FALSE; 2680 uint64_t thismin = UINT64_MAX; 2681 uint64_t thismax = 0; 2682 2683 if (vd->vdev_children == 0) { 2684 mutex_enter(&vd->vdev_dtl_lock); 2685 if (!range_tree_is_empty(vd->vdev_dtl[DTL_MISSING]) && 2686 vdev_writeable(vd)) { 2687 2688 thismin = vdev_dtl_min(vd); 2689 thismax = vdev_dtl_max(vd); 2690 needed = B_TRUE; 2691 } 2692 mutex_exit(&vd->vdev_dtl_lock); 2693 } else { 2694 for (int c = 0; c < vd->vdev_children; c++) { 2695 vdev_t *cvd = vd->vdev_child[c]; 2696 uint64_t cmin, cmax; 2697 2698 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 2699 thismin = MIN(thismin, cmin); 2700 thismax = MAX(thismax, cmax); 2701 needed = B_TRUE; 2702 } 2703 } 2704 } 2705 2706 if (needed && minp) { 2707 *minp = thismin; 2708 *maxp = thismax; 2709 } 2710 return (needed); 2711} 2712 2713/* 2714 * Gets the checkpoint space map object from the vdev's ZAP. 2715 * Returns the spacemap object, or 0 if it wasn't in the ZAP 2716 * or the ZAP doesn't exist yet. 2717 */ 2718int 2719vdev_checkpoint_sm_object(vdev_t *vd) 2720{ 2721 ASSERT0(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER)); 2722 if (vd->vdev_top_zap == 0) { 2723 return (0); 2724 } 2725 2726 uint64_t sm_obj = 0; 2727 int err = zap_lookup(spa_meta_objset(vd->vdev_spa), vd->vdev_top_zap, 2728 VDEV_TOP_ZAP_POOL_CHECKPOINT_SM, sizeof (uint64_t), 1, &sm_obj); 2729 2730 ASSERT(err == 0 || err == ENOENT); 2731 2732 return (sm_obj); 2733} 2734 2735int 2736vdev_load(vdev_t *vd) 2737{ 2738 int error = 0; 2739 /* 2740 * Recursively load all children. 2741 */ 2742 for (int c = 0; c < vd->vdev_children; c++) { 2743 error = vdev_load(vd->vdev_child[c]); 2744 if (error != 0) { 2745 return (error); 2746 } 2747 } 2748 2749 vdev_set_deflate_ratio(vd); 2750 2751 /* 2752 * If this is a top-level vdev, initialize its metaslabs. 2753 */ 2754 if (vd == vd->vdev_top && vdev_is_concrete(vd)) { 2755 if (vd->vdev_ashift == 0 || vd->vdev_asize == 0) { 2756 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2757 VDEV_AUX_CORRUPT_DATA); 2758 vdev_dbgmsg(vd, "vdev_load: invalid size. ashift=%llu, " 2759 "asize=%llu", (u_longlong_t)vd->vdev_ashift, 2760 (u_longlong_t)vd->vdev_asize); 2761 return (SET_ERROR(ENXIO)); 2762 } else if ((error = vdev_metaslab_init(vd, 0)) != 0) { 2763 vdev_dbgmsg(vd, "vdev_load: metaslab_init failed " 2764 "[error=%d]", error); 2765 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2766 VDEV_AUX_CORRUPT_DATA); 2767 return (error); 2768 } 2769 2770 uint64_t checkpoint_sm_obj = vdev_checkpoint_sm_object(vd); 2771 if (checkpoint_sm_obj != 0) { 2772 objset_t *mos = spa_meta_objset(vd->vdev_spa); 2773 ASSERT(vd->vdev_asize != 0); 2774 ASSERT3P(vd->vdev_checkpoint_sm, ==, NULL); 2775 2776 if ((error = space_map_open(&vd->vdev_checkpoint_sm, 2777 mos, checkpoint_sm_obj, 0, vd->vdev_asize, 2778 vd->vdev_ashift))) { 2779 vdev_dbgmsg(vd, "vdev_load: space_map_open " 2780 "failed for checkpoint spacemap (obj %llu) " 2781 "[error=%d]", 2782 (u_longlong_t)checkpoint_sm_obj, error); 2783 return (error); 2784 } 2785 ASSERT3P(vd->vdev_checkpoint_sm, !=, NULL); 2786 space_map_update(vd->vdev_checkpoint_sm); 2787 2788 /* 2789 * Since the checkpoint_sm contains free entries 2790 * exclusively we can use sm_alloc to indicate the 2791 * culmulative checkpointed space that has been freed. 2792 */ 2793 vd->vdev_stat.vs_checkpoint_space = 2794 -vd->vdev_checkpoint_sm->sm_alloc; 2795 vd->vdev_spa->spa_checkpoint_info.sci_dspace += 2796 vd->vdev_stat.vs_checkpoint_space; 2797 } 2798 } 2799 2800 /* 2801 * If this is a leaf vdev, load its DTL. 2802 */ 2803 if (vd->vdev_ops->vdev_op_leaf && (error = vdev_dtl_load(vd)) != 0) { 2804 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2805 VDEV_AUX_CORRUPT_DATA); 2806 vdev_dbgmsg(vd, "vdev_load: vdev_dtl_load failed " 2807 "[error=%d]", error); 2808 return (error); 2809 } 2810 2811 uint64_t obsolete_sm_object = vdev_obsolete_sm_object(vd); 2812 if (obsolete_sm_object != 0) { 2813 objset_t *mos = vd->vdev_spa->spa_meta_objset; 2814 ASSERT(vd->vdev_asize != 0); 2815 ASSERT3P(vd->vdev_obsolete_sm, ==, NULL); 2816 2817 if ((error = space_map_open(&vd->vdev_obsolete_sm, mos, 2818 obsolete_sm_object, 0, vd->vdev_asize, 0))) { 2819 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 2820 VDEV_AUX_CORRUPT_DATA); 2821 vdev_dbgmsg(vd, "vdev_load: space_map_open failed for " 2822 "obsolete spacemap (obj %llu) [error=%d]", 2823 (u_longlong_t)obsolete_sm_object, error); 2824 return (error); 2825 } 2826 space_map_update(vd->vdev_obsolete_sm); 2827 } 2828 2829 return (0); 2830} 2831 2832/* 2833 * The special vdev case is used for hot spares and l2cache devices. Its 2834 * sole purpose it to set the vdev state for the associated vdev. To do this, 2835 * we make sure that we can open the underlying device, then try to read the 2836 * label, and make sure that the label is sane and that it hasn't been 2837 * repurposed to another pool. 2838 */ 2839int 2840vdev_validate_aux(vdev_t *vd) 2841{ 2842 nvlist_t *label; 2843 uint64_t guid, version; 2844 uint64_t state; 2845 2846 if (!vdev_readable(vd)) 2847 return (0); 2848 2849 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) { 2850 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2851 VDEV_AUX_CORRUPT_DATA); 2852 return (-1); 2853 } 2854 2855 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 2856 !SPA_VERSION_IS_SUPPORTED(version) || 2857 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 2858 guid != vd->vdev_guid || 2859 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 2860 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 2861 VDEV_AUX_CORRUPT_DATA); 2862 nvlist_free(label); 2863 return (-1); 2864 } 2865 2866 /* 2867 * We don't actually check the pool state here. If it's in fact in 2868 * use by another pool, we update this fact on the fly when requested. 2869 */ 2870 nvlist_free(label); 2871 return (0); 2872} 2873 2874/* 2875 * Free the objects used to store this vdev's spacemaps, and the array 2876 * that points to them. 2877 */ 2878void 2879vdev_destroy_spacemaps(vdev_t *vd, dmu_tx_t *tx) 2880{ 2881 if (vd->vdev_ms_array == 0) 2882 return; 2883 2884 objset_t *mos = vd->vdev_spa->spa_meta_objset; 2885 uint64_t array_count = vd->vdev_asize >> vd->vdev_ms_shift; 2886 size_t array_bytes = array_count * sizeof (uint64_t); 2887 uint64_t *smobj_array = kmem_alloc(array_bytes, KM_SLEEP); 2888 VERIFY0(dmu_read(mos, vd->vdev_ms_array, 0, 2889 array_bytes, smobj_array, 0)); 2890 2891 for (uint64_t i = 0; i < array_count; i++) { 2892 uint64_t smobj = smobj_array[i]; 2893 if (smobj == 0) 2894 continue; 2895 2896 space_map_free_obj(mos, smobj, tx); 2897 } 2898 2899 kmem_free(smobj_array, array_bytes); 2900 VERIFY0(dmu_object_free(mos, vd->vdev_ms_array, tx)); 2901 vd->vdev_ms_array = 0; 2902} 2903 2904static void 2905vdev_remove_empty(vdev_t *vd, uint64_t txg) 2906{ 2907 spa_t *spa = vd->vdev_spa; 2908 dmu_tx_t *tx; 2909 2910 ASSERT(vd == vd->vdev_top); 2911 ASSERT3U(txg, ==, spa_syncing_txg(spa)); 2912 2913 if (vd->vdev_ms != NULL) { 2914 metaslab_group_t *mg = vd->vdev_mg; 2915 2916 metaslab_group_histogram_verify(mg); 2917 metaslab_class_histogram_verify(mg->mg_class); 2918 2919 for (int m = 0; m < vd->vdev_ms_count; m++) { 2920 metaslab_t *msp = vd->vdev_ms[m]; 2921 2922 if (msp == NULL || msp->ms_sm == NULL) 2923 continue; 2924 2925 mutex_enter(&msp->ms_lock); 2926 /* 2927 * If the metaslab was not loaded when the vdev 2928 * was removed then the histogram accounting may 2929 * not be accurate. Update the histogram information 2930 * here so that we ensure that the metaslab group 2931 * and metaslab class are up-to-date. 2932 */ 2933 metaslab_group_histogram_remove(mg, msp); 2934 2935 VERIFY0(space_map_allocated(msp->ms_sm)); 2936 space_map_close(msp->ms_sm); 2937 msp->ms_sm = NULL; 2938 mutex_exit(&msp->ms_lock); 2939 } 2940 2941 if (vd->vdev_checkpoint_sm != NULL) { 2942 ASSERT(spa_has_checkpoint(spa)); 2943 space_map_close(vd->vdev_checkpoint_sm); 2944 vd->vdev_checkpoint_sm = NULL; 2945 } 2946 2947 metaslab_group_histogram_verify(mg); 2948 metaslab_class_histogram_verify(mg->mg_class); 2949 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) 2950 ASSERT0(mg->mg_histogram[i]); 2951 } 2952 2953 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 2954 vdev_destroy_spacemaps(vd, tx); 2955 2956 if (vd->vdev_islog && vd->vdev_top_zap != 0) { 2957 vdev_destroy_unlink_zap(vd, vd->vdev_top_zap, tx); 2958 vd->vdev_top_zap = 0; 2959 } 2960 dmu_tx_commit(tx); 2961} 2962 2963void 2964vdev_sync_done(vdev_t *vd, uint64_t txg) 2965{ 2966 metaslab_t *msp; 2967 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2968 2969 ASSERT(vdev_is_concrete(vd)); 2970 2971 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2972 metaslab_sync_done(msp, txg); 2973 2974 if (reassess) 2975 metaslab_sync_reassess(vd->vdev_mg); 2976} 2977 2978void 2979vdev_sync(vdev_t *vd, uint64_t txg) 2980{ 2981 spa_t *spa = vd->vdev_spa; 2982 vdev_t *lvd; 2983 metaslab_t *msp; 2984 dmu_tx_t *tx; 2985 2986 if (range_tree_space(vd->vdev_obsolete_segments) > 0) { 2987 dmu_tx_t *tx; 2988 2989 ASSERT(vd->vdev_removing || 2990 vd->vdev_ops == &vdev_indirect_ops); 2991 2992 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2993 vdev_indirect_sync_obsolete(vd, tx); 2994 dmu_tx_commit(tx); 2995 2996 /* 2997 * If the vdev is indirect, it can't have dirty 2998 * metaslabs or DTLs. 2999 */ 3000 if (vd->vdev_ops == &vdev_indirect_ops) { 3001 ASSERT(txg_list_empty(&vd->vdev_ms_list, txg)); 3002 ASSERT(txg_list_empty(&vd->vdev_dtl_list, txg)); 3003 return; 3004 } 3005 } 3006 3007 ASSERT(vdev_is_concrete(vd)); 3008 3009 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0 && 3010 !vd->vdev_removing) { 3011 ASSERT(vd == vd->vdev_top); 3012 ASSERT0(vd->vdev_indirect_config.vic_mapping_object); 3013 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 3014 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 3015 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 3016 ASSERT(vd->vdev_ms_array != 0); 3017 vdev_config_dirty(vd); 3018 dmu_tx_commit(tx); 3019 } 3020 3021 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 3022 metaslab_sync(msp, txg); 3023 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 3024 } 3025 3026 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 3027 vdev_dtl_sync(lvd, txg); 3028 3029 /* 3030 * Remove the metadata associated with this vdev once it's empty. 3031 * Note that this is typically used for log/cache device removal; 3032 * we don't empty toplevel vdevs when removing them. But if 3033 * a toplevel happens to be emptied, this is not harmful. 3034 */ 3035 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) { 3036 vdev_remove_empty(vd, txg); 3037 } 3038 3039 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 3040} 3041 3042uint64_t 3043vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 3044{ 3045 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 3046} 3047 3048/* 3049 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 3050 * not be opened, and no I/O is attempted. 3051 */ 3052int 3053vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 3054{ 3055 vdev_t *vd, *tvd; 3056 3057 spa_vdev_state_enter(spa, SCL_NONE); 3058 3059 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3060 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3061 3062 if (!vd->vdev_ops->vdev_op_leaf) 3063 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3064 3065 tvd = vd->vdev_top; 3066 3067 /* 3068 * We don't directly use the aux state here, but if we do a 3069 * vdev_reopen(), we need this value to be present to remember why we 3070 * were faulted. 3071 */ 3072 vd->vdev_label_aux = aux; 3073 3074 /* 3075 * Faulted state takes precedence over degraded. 3076 */ 3077 vd->vdev_delayed_close = B_FALSE; 3078 vd->vdev_faulted = 1ULL; 3079 vd->vdev_degraded = 0ULL; 3080 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 3081 3082 /* 3083 * If this device has the only valid copy of the data, then 3084 * back off and simply mark the vdev as degraded instead. 3085 */ 3086 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 3087 vd->vdev_degraded = 1ULL; 3088 vd->vdev_faulted = 0ULL; 3089 3090 /* 3091 * If we reopen the device and it's not dead, only then do we 3092 * mark it degraded. 3093 */ 3094 vdev_reopen(tvd); 3095 3096 if (vdev_readable(vd)) 3097 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 3098 } 3099 3100 return (spa_vdev_state_exit(spa, vd, 0)); 3101} 3102 3103/* 3104 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 3105 * user that something is wrong. The vdev continues to operate as normal as far 3106 * as I/O is concerned. 3107 */ 3108int 3109vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 3110{ 3111 vdev_t *vd; 3112 3113 spa_vdev_state_enter(spa, SCL_NONE); 3114 3115 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3116 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3117 3118 if (!vd->vdev_ops->vdev_op_leaf) 3119 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3120 3121 /* 3122 * If the vdev is already faulted, then don't do anything. 3123 */ 3124 if (vd->vdev_faulted || vd->vdev_degraded) 3125 return (spa_vdev_state_exit(spa, NULL, 0)); 3126 3127 vd->vdev_degraded = 1ULL; 3128 if (!vdev_is_dead(vd)) 3129 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 3130 aux); 3131 3132 return (spa_vdev_state_exit(spa, vd, 0)); 3133} 3134 3135/* 3136 * Online the given vdev. 3137 * 3138 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached 3139 * spare device should be detached when the device finishes resilvering. 3140 * Second, the online should be treated like a 'test' online case, so no FMA 3141 * events are generated if the device fails to open. 3142 */ 3143int 3144vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 3145{ 3146 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 3147 boolean_t wasoffline; 3148 vdev_state_t oldstate; 3149 3150 spa_vdev_state_enter(spa, SCL_NONE); 3151 3152 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3153 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3154 3155 if (!vd->vdev_ops->vdev_op_leaf) 3156 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3157 3158 wasoffline = (vd->vdev_offline || vd->vdev_tmpoffline); 3159 oldstate = vd->vdev_state; 3160 3161 tvd = vd->vdev_top; 3162 vd->vdev_offline = B_FALSE; 3163 vd->vdev_tmpoffline = B_FALSE; 3164 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 3165 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 3166 3167 /* XXX - L2ARC 1.0 does not support expansion */ 3168 if (!vd->vdev_aux) { 3169 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3170 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 3171 } 3172 3173 vdev_reopen(tvd); 3174 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 3175 3176 if (!vd->vdev_aux) { 3177 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3178 pvd->vdev_expanding = B_FALSE; 3179 } 3180 3181 if (newstate) 3182 *newstate = vd->vdev_state; 3183 if ((flags & ZFS_ONLINE_UNSPARE) && 3184 !vdev_is_dead(vd) && vd->vdev_parent && 3185 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 3186 vd->vdev_parent->vdev_child[0] == vd) 3187 vd->vdev_unspare = B_TRUE; 3188 3189 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 3190 3191 /* XXX - L2ARC 1.0 does not support expansion */ 3192 if (vd->vdev_aux) 3193 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 3194 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 3195 } 3196 3197 if (wasoffline || 3198 (oldstate < VDEV_STATE_DEGRADED && 3199 vd->vdev_state >= VDEV_STATE_DEGRADED)) 3200 spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_ONLINE); 3201 3202 return (spa_vdev_state_exit(spa, vd, 0)); 3203} 3204 3205static int 3206vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 3207{ 3208 vdev_t *vd, *tvd; 3209 int error = 0; 3210 uint64_t generation; 3211 metaslab_group_t *mg; 3212 3213top: 3214 spa_vdev_state_enter(spa, SCL_ALLOC); 3215 3216 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 3217 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 3218 3219 if (!vd->vdev_ops->vdev_op_leaf) 3220 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 3221 3222 tvd = vd->vdev_top; 3223 mg = tvd->vdev_mg; 3224 generation = spa->spa_config_generation + 1; 3225 3226 /* 3227 * If the device isn't already offline, try to offline it. 3228 */ 3229 if (!vd->vdev_offline) { 3230 /* 3231 * If this device has the only valid copy of some data, 3232 * don't allow it to be offlined. Log devices are always 3233 * expendable. 3234 */ 3235 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 3236 vdev_dtl_required(vd)) 3237 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 3238 3239 /* 3240 * If the top-level is a slog and it has had allocations 3241 * then proceed. We check that the vdev's metaslab group 3242 * is not NULL since it's possible that we may have just 3243 * added this vdev but not yet initialized its metaslabs. 3244 */ 3245 if (tvd->vdev_islog && mg != NULL) { 3246 /* 3247 * Prevent any future allocations. 3248 */ 3249 metaslab_group_passivate(mg); 3250 (void) spa_vdev_state_exit(spa, vd, 0); 3251 3252 error = spa_reset_logs(spa); 3253 3254 /* 3255 * If the log device was successfully reset but has 3256 * checkpointed data, do not offline it. 3257 */ 3258 if (error == 0 && 3259 tvd->vdev_checkpoint_sm != NULL) { 3260 ASSERT3U(tvd->vdev_checkpoint_sm->sm_alloc, 3261 !=, 0); 3262 error = ZFS_ERR_CHECKPOINT_EXISTS; 3263 } 3264 3265 spa_vdev_state_enter(spa, SCL_ALLOC); 3266 3267 /* 3268 * Check to see if the config has changed. 3269 */ 3270 if (error || generation != spa->spa_config_generation) { 3271 metaslab_group_activate(mg); 3272 if (error) 3273 return (spa_vdev_state_exit(spa, 3274 vd, error)); 3275 (void) spa_vdev_state_exit(spa, vd, 0); 3276 goto top; 3277 } 3278 ASSERT0(tvd->vdev_stat.vs_alloc); 3279 } 3280 3281 /* 3282 * Offline this device and reopen its top-level vdev. 3283 * If the top-level vdev is a log device then just offline 3284 * it. Otherwise, if this action results in the top-level 3285 * vdev becoming unusable, undo it and fail the request. 3286 */ 3287 vd->vdev_offline = B_TRUE; 3288 vdev_reopen(tvd); 3289 3290 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 3291 vdev_is_dead(tvd)) { 3292 vd->vdev_offline = B_FALSE; 3293 vdev_reopen(tvd); 3294 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 3295 } 3296 3297 /* 3298 * Add the device back into the metaslab rotor so that 3299 * once we online the device it's open for business. 3300 */ 3301 if (tvd->vdev_islog && mg != NULL) 3302 metaslab_group_activate(mg); 3303 } 3304 3305 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 3306 3307 return (spa_vdev_state_exit(spa, vd, 0)); 3308} 3309 3310int 3311vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 3312{ 3313 int error; 3314 3315 mutex_enter(&spa->spa_vdev_top_lock); 3316 error = vdev_offline_locked(spa, guid, flags); 3317 mutex_exit(&spa->spa_vdev_top_lock); 3318 3319 return (error); 3320} 3321 3322/* 3323 * Clear the error counts associated with this vdev. Unlike vdev_online() and 3324 * vdev_offline(), we assume the spa config is locked. We also clear all 3325 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 3326 */ 3327void 3328vdev_clear(spa_t *spa, vdev_t *vd) 3329{ 3330 vdev_t *rvd = spa->spa_root_vdev; 3331 3332 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3333 3334 if (vd == NULL) 3335 vd = rvd; 3336 3337 vd->vdev_stat.vs_read_errors = 0; 3338 vd->vdev_stat.vs_write_errors = 0; 3339 vd->vdev_stat.vs_checksum_errors = 0; 3340 3341 for (int c = 0; c < vd->vdev_children; c++) 3342 vdev_clear(spa, vd->vdev_child[c]); 3343 3344 if (vd == rvd) { 3345 for (int c = 0; c < spa->spa_l2cache.sav_count; c++) 3346 vdev_clear(spa, spa->spa_l2cache.sav_vdevs[c]); 3347 3348 for (int c = 0; c < spa->spa_spares.sav_count; c++) 3349 vdev_clear(spa, spa->spa_spares.sav_vdevs[c]); 3350 } 3351 3352 /* 3353 * It makes no sense to "clear" an indirect vdev. 3354 */ 3355 if (!vdev_is_concrete(vd)) 3356 return; 3357 3358 /* 3359 * If we're in the FAULTED state or have experienced failed I/O, then 3360 * clear the persistent state and attempt to reopen the device. We 3361 * also mark the vdev config dirty, so that the new faulted state is 3362 * written out to disk. 3363 */ 3364 if (vd->vdev_faulted || vd->vdev_degraded || 3365 !vdev_readable(vd) || !vdev_writeable(vd)) { 3366 3367 /* 3368 * When reopening in reponse to a clear event, it may be due to 3369 * a fmadm repair request. In this case, if the device is 3370 * still broken, we want to still post the ereport again. 3371 */ 3372 vd->vdev_forcefault = B_TRUE; 3373 3374 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 3375 vd->vdev_cant_read = B_FALSE; 3376 vd->vdev_cant_write = B_FALSE; 3377 3378 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 3379 3380 vd->vdev_forcefault = B_FALSE; 3381 3382 if (vd != rvd && vdev_writeable(vd->vdev_top)) 3383 vdev_state_dirty(vd->vdev_top); 3384 3385 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 3386 spa_async_request(spa, SPA_ASYNC_RESILVER); 3387 3388 spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_CLEAR); 3389 } 3390 3391 /* 3392 * When clearing a FMA-diagnosed fault, we always want to 3393 * unspare the device, as we assume that the original spare was 3394 * done in response to the FMA fault. 3395 */ 3396 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 3397 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 3398 vd->vdev_parent->vdev_child[0] == vd) 3399 vd->vdev_unspare = B_TRUE; 3400} 3401 3402boolean_t 3403vdev_is_dead(vdev_t *vd) 3404{ 3405 /* 3406 * Holes and missing devices are always considered "dead". 3407 * This simplifies the code since we don't have to check for 3408 * these types of devices in the various code paths. 3409 * Instead we rely on the fact that we skip over dead devices 3410 * before issuing I/O to them. 3411 */ 3412 return (vd->vdev_state < VDEV_STATE_DEGRADED || 3413 vd->vdev_ops == &vdev_hole_ops || 3414 vd->vdev_ops == &vdev_missing_ops); 3415} 3416 3417boolean_t 3418vdev_readable(vdev_t *vd) 3419{ 3420 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 3421} 3422 3423boolean_t 3424vdev_writeable(vdev_t *vd) 3425{ 3426 return (!vdev_is_dead(vd) && !vd->vdev_cant_write && 3427 vdev_is_concrete(vd)); 3428} 3429 3430boolean_t 3431vdev_allocatable(vdev_t *vd) 3432{ 3433 uint64_t state = vd->vdev_state; 3434 3435 /* 3436 * We currently allow allocations from vdevs which may be in the 3437 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 3438 * fails to reopen then we'll catch it later when we're holding 3439 * the proper locks. Note that we have to get the vdev state 3440 * in a local variable because although it changes atomically, 3441 * we're asking two separate questions about it. 3442 */ 3443 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 3444 !vd->vdev_cant_write && vdev_is_concrete(vd) && 3445 vd->vdev_mg->mg_initialized); 3446} 3447 3448boolean_t 3449vdev_accessible(vdev_t *vd, zio_t *zio) 3450{ 3451 ASSERT(zio->io_vd == vd); 3452 3453 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 3454 return (B_FALSE); 3455 3456 if (zio->io_type == ZIO_TYPE_READ) 3457 return (!vd->vdev_cant_read); 3458 3459 if (zio->io_type == ZIO_TYPE_WRITE) 3460 return (!vd->vdev_cant_write); 3461 3462 return (B_TRUE); 3463} 3464 3465boolean_t 3466vdev_is_spacemap_addressable(vdev_t *vd) 3467{ 3468 /* 3469 * Assuming 47 bits of the space map entry dedicated for the entry's 3470 * offset (see description in space_map.h), we calculate the maximum 3471 * address that can be described by a space map entry for the given 3472 * device. 3473 */ 3474 uint64_t shift = vd->vdev_ashift + 47; 3475 3476 if (shift >= 63) /* detect potential overflow */ 3477 return (B_TRUE); 3478 3479 return (vd->vdev_asize < (1ULL << shift)); 3480} 3481 3482/* 3483 * Get statistics for the given vdev. 3484 */ 3485void 3486vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 3487{ 3488 spa_t *spa = vd->vdev_spa; 3489 vdev_t *rvd = spa->spa_root_vdev; 3490 vdev_t *tvd = vd->vdev_top; 3491 3492 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 3493 3494 mutex_enter(&vd->vdev_stat_lock); 3495 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 3496 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 3497 vs->vs_state = vd->vdev_state; 3498 vs->vs_rsize = vdev_get_min_asize(vd); 3499 if (vd->vdev_ops->vdev_op_leaf) 3500 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 3501 /* 3502 * Report expandable space on top-level, non-auxillary devices only. 3503 * The expandable space is reported in terms of metaslab sized units 3504 * since that determines how much space the pool can expand. 3505 */ 3506 if (vd->vdev_aux == NULL && tvd != NULL && vd->vdev_max_asize != 0) { 3507 vs->vs_esize = P2ALIGN(vd->vdev_max_asize - vd->vdev_asize - 3508 spa->spa_bootsize, 1ULL << tvd->vdev_ms_shift); 3509 } 3510 vs->vs_configured_ashift = vd->vdev_top != NULL 3511 ? vd->vdev_top->vdev_ashift : vd->vdev_ashift; 3512 vs->vs_logical_ashift = vd->vdev_logical_ashift; 3513 vs->vs_physical_ashift = vd->vdev_physical_ashift; 3514 if (vd->vdev_aux == NULL && vd == vd->vdev_top && 3515 vdev_is_concrete(vd)) { 3516 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation; 3517 } 3518 3519 /* 3520 * If we're getting stats on the root vdev, aggregate the I/O counts 3521 * over all top-level vdevs (i.e. the direct children of the root). 3522 */ 3523 if (vd == rvd) { 3524 for (int c = 0; c < rvd->vdev_children; c++) { 3525 vdev_t *cvd = rvd->vdev_child[c]; 3526 vdev_stat_t *cvs = &cvd->vdev_stat; 3527 3528 for (int t = 0; t < ZIO_TYPES; t++) { 3529 vs->vs_ops[t] += cvs->vs_ops[t]; 3530 vs->vs_bytes[t] += cvs->vs_bytes[t]; 3531 } 3532 cvs->vs_scan_removing = cvd->vdev_removing; 3533 } 3534 } 3535 mutex_exit(&vd->vdev_stat_lock); 3536} 3537 3538void 3539vdev_clear_stats(vdev_t *vd) 3540{ 3541 mutex_enter(&vd->vdev_stat_lock); 3542 vd->vdev_stat.vs_space = 0; 3543 vd->vdev_stat.vs_dspace = 0; 3544 vd->vdev_stat.vs_alloc = 0; 3545 mutex_exit(&vd->vdev_stat_lock); 3546} 3547 3548void 3549vdev_scan_stat_init(vdev_t *vd) 3550{ 3551 vdev_stat_t *vs = &vd->vdev_stat; 3552 3553 for (int c = 0; c < vd->vdev_children; c++) 3554 vdev_scan_stat_init(vd->vdev_child[c]); 3555 3556 mutex_enter(&vd->vdev_stat_lock); 3557 vs->vs_scan_processed = 0; 3558 mutex_exit(&vd->vdev_stat_lock); 3559} 3560 3561void 3562vdev_stat_update(zio_t *zio, uint64_t psize) 3563{ 3564 spa_t *spa = zio->io_spa; 3565 vdev_t *rvd = spa->spa_root_vdev; 3566 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 3567 vdev_t *pvd; 3568 uint64_t txg = zio->io_txg; 3569 vdev_stat_t *vs = &vd->vdev_stat; 3570 zio_type_t type = zio->io_type; 3571 int flags = zio->io_flags; 3572 3573 /* 3574 * If this i/o is a gang leader, it didn't do any actual work. 3575 */ 3576 if (zio->io_gang_tree) 3577 return; 3578 3579 if (zio->io_error == 0) { 3580 /* 3581 * If this is a root i/o, don't count it -- we've already 3582 * counted the top-level vdevs, and vdev_get_stats() will 3583 * aggregate them when asked. This reduces contention on 3584 * the root vdev_stat_lock and implicitly handles blocks 3585 * that compress away to holes, for which there is no i/o. 3586 * (Holes never create vdev children, so all the counters 3587 * remain zero, which is what we want.) 3588 * 3589 * Note: this only applies to successful i/o (io_error == 0) 3590 * because unlike i/o counts, errors are not additive. 3591 * When reading a ditto block, for example, failure of 3592 * one top-level vdev does not imply a root-level error. 3593 */ 3594 if (vd == rvd) 3595 return; 3596 3597 ASSERT(vd == zio->io_vd); 3598 3599 if (flags & ZIO_FLAG_IO_BYPASS) 3600 return; 3601 3602 mutex_enter(&vd->vdev_stat_lock); 3603 3604 if (flags & ZIO_FLAG_IO_REPAIR) { 3605 if (flags & ZIO_FLAG_SCAN_THREAD) { 3606 dsl_scan_phys_t *scn_phys = 3607 &spa->spa_dsl_pool->dp_scan->scn_phys; 3608 uint64_t *processed = &scn_phys->scn_processed; 3609 3610 /* XXX cleanup? */ 3611 if (vd->vdev_ops->vdev_op_leaf) 3612 atomic_add_64(processed, psize); 3613 vs->vs_scan_processed += psize; 3614 } 3615 3616 if (flags & ZIO_FLAG_SELF_HEAL) 3617 vs->vs_self_healed += psize; 3618 } 3619 3620 vs->vs_ops[type]++; 3621 vs->vs_bytes[type] += psize; 3622 3623 mutex_exit(&vd->vdev_stat_lock); 3624 return; 3625 } 3626 3627 if (flags & ZIO_FLAG_SPECULATIVE) 3628 return; 3629 3630 /* 3631 * If this is an I/O error that is going to be retried, then ignore the 3632 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 3633 * hard errors, when in reality they can happen for any number of 3634 * innocuous reasons (bus resets, MPxIO link failure, etc). 3635 */ 3636 if (zio->io_error == EIO && 3637 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 3638 return; 3639 3640 /* 3641 * Intent logs writes won't propagate their error to the root 3642 * I/O so don't mark these types of failures as pool-level 3643 * errors. 3644 */ 3645 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 3646 return; 3647 3648 mutex_enter(&vd->vdev_stat_lock); 3649 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 3650 if (zio->io_error == ECKSUM) 3651 vs->vs_checksum_errors++; 3652 else 3653 vs->vs_read_errors++; 3654 } 3655 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 3656 vs->vs_write_errors++; 3657 mutex_exit(&vd->vdev_stat_lock); 3658 3659 if (spa->spa_load_state == SPA_LOAD_NONE && 3660 type == ZIO_TYPE_WRITE && txg != 0 && 3661 (!(flags & ZIO_FLAG_IO_REPAIR) || 3662 (flags & ZIO_FLAG_SCAN_THREAD) || 3663 spa->spa_claiming)) { 3664 /* 3665 * This is either a normal write (not a repair), or it's 3666 * a repair induced by the scrub thread, or it's a repair 3667 * made by zil_claim() during spa_load() in the first txg. 3668 * In the normal case, we commit the DTL change in the same 3669 * txg as the block was born. In the scrub-induced repair 3670 * case, we know that scrubs run in first-pass syncing context, 3671 * so we commit the DTL change in spa_syncing_txg(spa). 3672 * In the zil_claim() case, we commit in spa_first_txg(spa). 3673 * 3674 * We currently do not make DTL entries for failed spontaneous 3675 * self-healing writes triggered by normal (non-scrubbing) 3676 * reads, because we have no transactional context in which to 3677 * do so -- and it's not clear that it'd be desirable anyway. 3678 */ 3679 if (vd->vdev_ops->vdev_op_leaf) { 3680 uint64_t commit_txg = txg; 3681 if (flags & ZIO_FLAG_SCAN_THREAD) { 3682 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 3683 ASSERT(spa_sync_pass(spa) == 1); 3684 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 3685 commit_txg = spa_syncing_txg(spa); 3686 } else if (spa->spa_claiming) { 3687 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 3688 commit_txg = spa_first_txg(spa); 3689 } 3690 ASSERT(commit_txg >= spa_syncing_txg(spa)); 3691 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 3692 return; 3693 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 3694 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 3695 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 3696 } 3697 if (vd != rvd) 3698 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 3699 } 3700} 3701 3702/* 3703 * Update the in-core space usage stats for this vdev, its metaslab class, 3704 * and the root vdev. 3705 */ 3706void 3707vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 3708 int64_t space_delta) 3709{ 3710 int64_t dspace_delta = space_delta; 3711 spa_t *spa = vd->vdev_spa; 3712 vdev_t *rvd = spa->spa_root_vdev; 3713 metaslab_group_t *mg = vd->vdev_mg; 3714 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 3715 3716 ASSERT(vd == vd->vdev_top); 3717 3718 /* 3719 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 3720 * factor. We must calculate this here and not at the root vdev 3721 * because the root vdev's psize-to-asize is simply the max of its 3722 * childrens', thus not accurate enough for us. 3723 */ 3724 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 3725 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 3726 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 3727 vd->vdev_deflate_ratio; 3728 3729 mutex_enter(&vd->vdev_stat_lock); 3730 vd->vdev_stat.vs_alloc += alloc_delta; 3731 vd->vdev_stat.vs_space += space_delta; 3732 vd->vdev_stat.vs_dspace += dspace_delta; 3733 mutex_exit(&vd->vdev_stat_lock); 3734 3735 if (mc == spa_normal_class(spa)) { 3736 mutex_enter(&rvd->vdev_stat_lock); 3737 rvd->vdev_stat.vs_alloc += alloc_delta; 3738 rvd->vdev_stat.vs_space += space_delta; 3739 rvd->vdev_stat.vs_dspace += dspace_delta; 3740 mutex_exit(&rvd->vdev_stat_lock); 3741 } 3742 3743 if (mc != NULL) { 3744 ASSERT(rvd == vd->vdev_parent); 3745 ASSERT(vd->vdev_ms_count != 0); 3746 3747 metaslab_class_space_update(mc, 3748 alloc_delta, defer_delta, space_delta, dspace_delta); 3749 } 3750} 3751 3752/* 3753 * Mark a top-level vdev's config as dirty, placing it on the dirty list 3754 * so that it will be written out next time the vdev configuration is synced. 3755 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 3756 */ 3757void 3758vdev_config_dirty(vdev_t *vd) 3759{ 3760 spa_t *spa = vd->vdev_spa; 3761 vdev_t *rvd = spa->spa_root_vdev; 3762 int c; 3763 3764 ASSERT(spa_writeable(spa)); 3765 3766 /* 3767 * If this is an aux vdev (as with l2cache and spare devices), then we 3768 * update the vdev config manually and set the sync flag. 3769 */ 3770 if (vd->vdev_aux != NULL) { 3771 spa_aux_vdev_t *sav = vd->vdev_aux; 3772 nvlist_t **aux; 3773 uint_t naux; 3774 3775 for (c = 0; c < sav->sav_count; c++) { 3776 if (sav->sav_vdevs[c] == vd) 3777 break; 3778 } 3779 3780 if (c == sav->sav_count) { 3781 /* 3782 * We're being removed. There's nothing more to do. 3783 */ 3784 ASSERT(sav->sav_sync == B_TRUE); 3785 return; 3786 } 3787 3788 sav->sav_sync = B_TRUE; 3789 3790 if (nvlist_lookup_nvlist_array(sav->sav_config, 3791 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 3792 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 3793 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 3794 } 3795 3796 ASSERT(c < naux); 3797 3798 /* 3799 * Setting the nvlist in the middle if the array is a little 3800 * sketchy, but it will work. 3801 */ 3802 nvlist_free(aux[c]); 3803 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 3804 3805 return; 3806 } 3807 3808 /* 3809 * The dirty list is protected by the SCL_CONFIG lock. The caller 3810 * must either hold SCL_CONFIG as writer, or must be the sync thread 3811 * (which holds SCL_CONFIG as reader). There's only one sync thread, 3812 * so this is sufficient to ensure mutual exclusion. 3813 */ 3814 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3815 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3816 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3817 3818 if (vd == rvd) { 3819 for (c = 0; c < rvd->vdev_children; c++) 3820 vdev_config_dirty(rvd->vdev_child[c]); 3821 } else { 3822 ASSERT(vd == vd->vdev_top); 3823 3824 if (!list_link_active(&vd->vdev_config_dirty_node) && 3825 vdev_is_concrete(vd)) { 3826 list_insert_head(&spa->spa_config_dirty_list, vd); 3827 } 3828 } 3829} 3830 3831void 3832vdev_config_clean(vdev_t *vd) 3833{ 3834 spa_t *spa = vd->vdev_spa; 3835 3836 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 3837 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3838 spa_config_held(spa, SCL_CONFIG, RW_READER))); 3839 3840 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 3841 list_remove(&spa->spa_config_dirty_list, vd); 3842} 3843 3844/* 3845 * Mark a top-level vdev's state as dirty, so that the next pass of 3846 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 3847 * the state changes from larger config changes because they require 3848 * much less locking, and are often needed for administrative actions. 3849 */ 3850void 3851vdev_state_dirty(vdev_t *vd) 3852{ 3853 spa_t *spa = vd->vdev_spa; 3854 3855 ASSERT(spa_writeable(spa)); 3856 ASSERT(vd == vd->vdev_top); 3857 3858 /* 3859 * The state list is protected by the SCL_STATE lock. The caller 3860 * must either hold SCL_STATE as writer, or must be the sync thread 3861 * (which holds SCL_STATE as reader). There's only one sync thread, 3862 * so this is sufficient to ensure mutual exclusion. 3863 */ 3864 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3865 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3866 spa_config_held(spa, SCL_STATE, RW_READER))); 3867 3868 if (!list_link_active(&vd->vdev_state_dirty_node) && 3869 vdev_is_concrete(vd)) 3870 list_insert_head(&spa->spa_state_dirty_list, vd); 3871} 3872 3873void 3874vdev_state_clean(vdev_t *vd) 3875{ 3876 spa_t *spa = vd->vdev_spa; 3877 3878 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 3879 (dsl_pool_sync_context(spa_get_dsl(spa)) && 3880 spa_config_held(spa, SCL_STATE, RW_READER))); 3881 3882 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 3883 list_remove(&spa->spa_state_dirty_list, vd); 3884} 3885 3886/* 3887 * Propagate vdev state up from children to parent. 3888 */ 3889void 3890vdev_propagate_state(vdev_t *vd) 3891{ 3892 spa_t *spa = vd->vdev_spa; 3893 vdev_t *rvd = spa->spa_root_vdev; 3894 int degraded = 0, faulted = 0; 3895 int corrupted = 0; 3896 vdev_t *child; 3897 3898 if (vd->vdev_children > 0) { 3899 for (int c = 0; c < vd->vdev_children; c++) { 3900 child = vd->vdev_child[c]; 3901 3902 /* 3903 * Don't factor holes or indirect vdevs into the 3904 * decision. 3905 */ 3906 if (!vdev_is_concrete(child)) 3907 continue; 3908 3909 if (!vdev_readable(child) || 3910 (!vdev_writeable(child) && spa_writeable(spa))) { 3911 /* 3912 * Root special: if there is a top-level log 3913 * device, treat the root vdev as if it were 3914 * degraded. 3915 */ 3916 if (child->vdev_islog && vd == rvd) 3917 degraded++; 3918 else 3919 faulted++; 3920 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 3921 degraded++; 3922 } 3923 3924 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 3925 corrupted++; 3926 } 3927 3928 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 3929 3930 /* 3931 * Root special: if there is a top-level vdev that cannot be 3932 * opened due to corrupted metadata, then propagate the root 3933 * vdev's aux state as 'corrupt' rather than 'insufficient 3934 * replicas'. 3935 */ 3936 if (corrupted && vd == rvd && 3937 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 3938 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 3939 VDEV_AUX_CORRUPT_DATA); 3940 } 3941 3942 if (vd->vdev_parent) 3943 vdev_propagate_state(vd->vdev_parent); 3944} 3945 3946/* 3947 * Set a vdev's state. If this is during an open, we don't update the parent 3948 * state, because we're in the process of opening children depth-first. 3949 * Otherwise, we propagate the change to the parent. 3950 * 3951 * If this routine places a device in a faulted state, an appropriate ereport is 3952 * generated. 3953 */ 3954void 3955vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 3956{ 3957 uint64_t save_state; 3958 spa_t *spa = vd->vdev_spa; 3959 3960 if (state == vd->vdev_state) { 3961 vd->vdev_stat.vs_aux = aux; 3962 return; 3963 } 3964 3965 save_state = vd->vdev_state; 3966 3967 vd->vdev_state = state; 3968 vd->vdev_stat.vs_aux = aux; 3969 3970 /* 3971 * If we are setting the vdev state to anything but an open state, then 3972 * always close the underlying device unless the device has requested 3973 * a delayed close (i.e. we're about to remove or fault the device). 3974 * Otherwise, we keep accessible but invalid devices open forever. 3975 * We don't call vdev_close() itself, because that implies some extra 3976 * checks (offline, etc) that we don't want here. This is limited to 3977 * leaf devices, because otherwise closing the device will affect other 3978 * children. 3979 */ 3980 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 3981 vd->vdev_ops->vdev_op_leaf) 3982 vd->vdev_ops->vdev_op_close(vd); 3983 3984 if (vd->vdev_removed && 3985 state == VDEV_STATE_CANT_OPEN && 3986 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 3987 /* 3988 * If the previous state is set to VDEV_STATE_REMOVED, then this 3989 * device was previously marked removed and someone attempted to 3990 * reopen it. If this failed due to a nonexistent device, then 3991 * keep the device in the REMOVED state. We also let this be if 3992 * it is one of our special test online cases, which is only 3993 * attempting to online the device and shouldn't generate an FMA 3994 * fault. 3995 */ 3996 vd->vdev_state = VDEV_STATE_REMOVED; 3997 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 3998 } else if (state == VDEV_STATE_REMOVED) { 3999 vd->vdev_removed = B_TRUE; 4000 } else if (state == VDEV_STATE_CANT_OPEN) { 4001 /* 4002 * If we fail to open a vdev during an import or recovery, we 4003 * mark it as "not available", which signifies that it was 4004 * never there to begin with. Failure to open such a device 4005 * is not considered an error. 4006 */ 4007 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 4008 spa_load_state(spa) == SPA_LOAD_RECOVER) && 4009 vd->vdev_ops->vdev_op_leaf) 4010 vd->vdev_not_present = 1; 4011 4012 /* 4013 * Post the appropriate ereport. If the 'prevstate' field is 4014 * set to something other than VDEV_STATE_UNKNOWN, it indicates 4015 * that this is part of a vdev_reopen(). In this case, we don't 4016 * want to post the ereport if the device was already in the 4017 * CANT_OPEN state beforehand. 4018 * 4019 * If the 'checkremove' flag is set, then this is an attempt to 4020 * online the device in response to an insertion event. If we 4021 * hit this case, then we have detected an insertion event for a 4022 * faulted or offline device that wasn't in the removed state. 4023 * In this scenario, we don't post an ereport because we are 4024 * about to replace the device, or attempt an online with 4025 * vdev_forcefault, which will generate the fault for us. 4026 */ 4027 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 4028 !vd->vdev_not_present && !vd->vdev_checkremove && 4029 vd != spa->spa_root_vdev) { 4030 const char *class; 4031 4032 switch (aux) { 4033 case VDEV_AUX_OPEN_FAILED: 4034 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 4035 break; 4036 case VDEV_AUX_CORRUPT_DATA: 4037 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 4038 break; 4039 case VDEV_AUX_NO_REPLICAS: 4040 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 4041 break; 4042 case VDEV_AUX_BAD_GUID_SUM: 4043 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 4044 break; 4045 case VDEV_AUX_TOO_SMALL: 4046 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 4047 break; 4048 case VDEV_AUX_BAD_LABEL: 4049 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 4050 break; 4051 default: 4052 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 4053 } 4054 4055 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 4056 } 4057 4058 /* Erase any notion of persistent removed state */ 4059 vd->vdev_removed = B_FALSE; 4060 } else { 4061 vd->vdev_removed = B_FALSE; 4062 } 4063 4064 /* 4065 * Notify the fmd of the state change. Be verbose and post 4066 * notifications even for stuff that's not important; the fmd agent can 4067 * sort it out. Don't emit state change events for non-leaf vdevs since 4068 * they can't change state on their own. The FMD can check their state 4069 * if it wants to when it sees that a leaf vdev had a state change. 4070 */ 4071 if (vd->vdev_ops->vdev_op_leaf) 4072 zfs_post_state_change(spa, vd); 4073 4074 if (!isopen && vd->vdev_parent) 4075 vdev_propagate_state(vd->vdev_parent); 4076} 4077 4078boolean_t 4079vdev_children_are_offline(vdev_t *vd) 4080{ 4081 ASSERT(!vd->vdev_ops->vdev_op_leaf); 4082 4083 for (uint64_t i = 0; i < vd->vdev_children; i++) { 4084 if (vd->vdev_child[i]->vdev_state != VDEV_STATE_OFFLINE) 4085 return (B_FALSE); 4086 } 4087 4088 return (B_TRUE); 4089} 4090 4091/* 4092 * Check the vdev configuration to ensure that it's capable of supporting 4093 * a root pool. We do not support partial configuration. 4094 * In addition, only a single top-level vdev is allowed. 4095 * 4096 * FreeBSD does not have above limitations. 4097 */ 4098boolean_t 4099vdev_is_bootable(vdev_t *vd) 4100{ 4101#ifdef illumos 4102 if (!vd->vdev_ops->vdev_op_leaf) { 4103 char *vdev_type = vd->vdev_ops->vdev_op_type; 4104 4105 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 4106 vd->vdev_children > 1) { 4107 return (B_FALSE); 4108 } else if (strcmp(vdev_type, VDEV_TYPE_MISSING) == 0 || 4109 strcmp(vdev_type, VDEV_TYPE_INDIRECT) == 0) { 4110 return (B_FALSE); 4111 } 4112 } 4113 4114 for (int c = 0; c < vd->vdev_children; c++) { 4115 if (!vdev_is_bootable(vd->vdev_child[c])) 4116 return (B_FALSE); 4117 } 4118#endif /* illumos */ 4119 return (B_TRUE); 4120} 4121 4122boolean_t 4123vdev_is_concrete(vdev_t *vd) 4124{ 4125 vdev_ops_t *ops = vd->vdev_ops; 4126 if (ops == &vdev_indirect_ops || ops == &vdev_hole_ops || 4127 ops == &vdev_missing_ops || ops == &vdev_root_ops) { 4128 return (B_FALSE); 4129 } else { 4130 return (B_TRUE); 4131 } 4132} 4133 4134/* 4135 * Determine if a log device has valid content. If the vdev was 4136 * removed or faulted in the MOS config then we know that 4137 * the content on the log device has already been written to the pool. 4138 */ 4139boolean_t 4140vdev_log_state_valid(vdev_t *vd) 4141{ 4142 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 4143 !vd->vdev_removed) 4144 return (B_TRUE); 4145 4146 for (int c = 0; c < vd->vdev_children; c++) 4147 if (vdev_log_state_valid(vd->vdev_child[c])) 4148 return (B_TRUE); 4149 4150 return (B_FALSE); 4151} 4152 4153/* 4154 * Expand a vdev if possible. 4155 */ 4156void 4157vdev_expand(vdev_t *vd, uint64_t txg) 4158{ 4159 ASSERT(vd->vdev_top == vd); 4160 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 4161 4162 vdev_set_deflate_ratio(vd); 4163 4164 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count && 4165 vdev_is_concrete(vd)) { 4166 VERIFY(vdev_metaslab_init(vd, txg) == 0); 4167 vdev_config_dirty(vd); 4168 } 4169} 4170 4171/* 4172 * Split a vdev. 4173 */ 4174void 4175vdev_split(vdev_t *vd) 4176{ 4177 vdev_t *cvd, *pvd = vd->vdev_parent; 4178 4179 vdev_remove_child(pvd, vd); 4180 vdev_compact_children(pvd); 4181 4182 cvd = pvd->vdev_child[0]; 4183 if (pvd->vdev_children == 1) { 4184 vdev_remove_parent(cvd); 4185 cvd->vdev_splitting = B_TRUE; 4186 } 4187 vdev_propagate_state(cvd); 4188} 4189 4190void 4191vdev_deadman(vdev_t *vd) 4192{ 4193 for (int c = 0; c < vd->vdev_children; c++) { 4194 vdev_t *cvd = vd->vdev_child[c]; 4195 4196 vdev_deadman(cvd); 4197 } 4198 4199 if (vd->vdev_ops->vdev_op_leaf) { 4200 vdev_queue_t *vq = &vd->vdev_queue; 4201 4202 mutex_enter(&vq->vq_lock); 4203 if (avl_numnodes(&vq->vq_active_tree) > 0) { 4204 spa_t *spa = vd->vdev_spa; 4205 zio_t *fio; 4206 uint64_t delta; 4207 4208 /* 4209 * Look at the head of all the pending queues, 4210 * if any I/O has been outstanding for longer than 4211 * the spa_deadman_synctime we panic the system. 4212 */ 4213 fio = avl_first(&vq->vq_active_tree); 4214 delta = gethrtime() - fio->io_timestamp; 4215 if (delta > spa_deadman_synctime(spa)) { 4216 vdev_dbgmsg(vd, "SLOW IO: zio timestamp " 4217 "%lluns, delta %lluns, last io %lluns", 4218 fio->io_timestamp, (u_longlong_t)delta, 4219 vq->vq_io_complete_ts); 4220 fm_panic("I/O to pool '%s' appears to be " 4221 "hung on vdev guid %llu at '%s'.", 4222 spa_name(spa), 4223 (long long unsigned int) vd->vdev_guid, 4224 vd->vdev_path); 4225 } 4226 } 4227 mutex_exit(&vq->vq_lock); 4228 } 4229} 4230