spa.c revision 307127
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, 2014 by Delphix. All rights reserved. 25 * Copyright (c) 2015, Nexenta Systems, Inc. All rights reserved. 26 * Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright 2013 Saso Kiselkov. All rights reserved. 29 * Copyright (c) 2014 Integros [integros.com] 30 */ 31 32/* 33 * SPA: Storage Pool Allocator 34 * 35 * This file contains all the routines used when modifying on-disk SPA state. 36 * This includes opening, importing, destroying, exporting a pool, and syncing a 37 * pool. 38 */ 39 40#include <sys/zfs_context.h> 41#include <sys/fm/fs/zfs.h> 42#include <sys/spa_impl.h> 43#include <sys/zio.h> 44#include <sys/zio_checksum.h> 45#include <sys/dmu.h> 46#include <sys/dmu_tx.h> 47#include <sys/zap.h> 48#include <sys/zil.h> 49#include <sys/ddt.h> 50#include <sys/vdev_impl.h> 51#include <sys/metaslab.h> 52#include <sys/metaslab_impl.h> 53#include <sys/uberblock_impl.h> 54#include <sys/txg.h> 55#include <sys/avl.h> 56#include <sys/dmu_traverse.h> 57#include <sys/dmu_objset.h> 58#include <sys/unique.h> 59#include <sys/dsl_pool.h> 60#include <sys/dsl_dataset.h> 61#include <sys/dsl_dir.h> 62#include <sys/dsl_prop.h> 63#include <sys/dsl_synctask.h> 64#include <sys/fs/zfs.h> 65#include <sys/arc.h> 66#include <sys/callb.h> 67#include <sys/spa_boot.h> 68#include <sys/zfs_ioctl.h> 69#include <sys/dsl_scan.h> 70#include <sys/dmu_send.h> 71#include <sys/dsl_destroy.h> 72#include <sys/dsl_userhold.h> 73#include <sys/zfeature.h> 74#include <sys/zvol.h> 75#include <sys/trim_map.h> 76 77#ifdef _KERNEL 78#include <sys/callb.h> 79#include <sys/cpupart.h> 80#include <sys/zone.h> 81#endif /* _KERNEL */ 82 83#include "zfs_prop.h" 84#include "zfs_comutil.h" 85 86/* Check hostid on import? */ 87static int check_hostid = 1; 88 89/* 90 * The interval, in seconds, at which failed configuration cache file writes 91 * should be retried. 92 */ 93static int zfs_ccw_retry_interval = 300; 94 95SYSCTL_DECL(_vfs_zfs); 96TUNABLE_INT("vfs.zfs.check_hostid", &check_hostid); 97SYSCTL_INT(_vfs_zfs, OID_AUTO, check_hostid, CTLFLAG_RWTUN, &check_hostid, 0, 98 "Check hostid on import?"); 99TUNABLE_INT("vfs.zfs.ccw_retry_interval", &zfs_ccw_retry_interval); 100SYSCTL_INT(_vfs_zfs, OID_AUTO, ccw_retry_interval, CTLFLAG_RW, 101 &zfs_ccw_retry_interval, 0, 102 "Configuration cache file write, retry after failure, interval (seconds)"); 103 104typedef enum zti_modes { 105 ZTI_MODE_FIXED, /* value is # of threads (min 1) */ 106 ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ 107 ZTI_MODE_NULL, /* don't create a taskq */ 108 ZTI_NMODES 109} zti_modes_t; 110 111#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } 112#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } 113#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } 114 115#define ZTI_N(n) ZTI_P(n, 1) 116#define ZTI_ONE ZTI_N(1) 117 118typedef struct zio_taskq_info { 119 zti_modes_t zti_mode; 120 uint_t zti_value; 121 uint_t zti_count; 122} zio_taskq_info_t; 123 124static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { 125 "issue", "issue_high", "intr", "intr_high" 126}; 127 128/* 129 * This table defines the taskq settings for each ZFS I/O type. When 130 * initializing a pool, we use this table to create an appropriately sized 131 * taskq. Some operations are low volume and therefore have a small, static 132 * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE 133 * macros. Other operations process a large amount of data; the ZTI_BATCH 134 * macro causes us to create a taskq oriented for throughput. Some operations 135 * are so high frequency and short-lived that the taskq itself can become a a 136 * point of lock contention. The ZTI_P(#, #) macro indicates that we need an 137 * additional degree of parallelism specified by the number of threads per- 138 * taskq and the number of taskqs; when dispatching an event in this case, the 139 * particular taskq is chosen at random. 140 * 141 * The different taskq priorities are to handle the different contexts (issue 142 * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that 143 * need to be handled with minimum delay. 144 */ 145const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { 146 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ 147 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ 148 { ZTI_N(8), ZTI_NULL, ZTI_P(12, 8), ZTI_NULL }, /* READ */ 149 { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ 150 { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ 151 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ 152 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ 153}; 154 155static sysevent_t *spa_event_create(spa_t *spa, vdev_t *vd, const char *name); 156static void spa_event_post(sysevent_t *ev); 157static void spa_sync_version(void *arg, dmu_tx_t *tx); 158static void spa_sync_props(void *arg, dmu_tx_t *tx); 159static boolean_t spa_has_active_shared_spare(spa_t *spa); 160static int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config, 161 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 162 char **ereport); 163static void spa_vdev_resilver_done(spa_t *spa); 164 165uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 166#ifdef PSRSET_BIND 167id_t zio_taskq_psrset_bind = PS_NONE; 168#endif 169#ifdef SYSDC 170boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 171#endif 172uint_t zio_taskq_basedc = 80; /* base duty cycle */ 173 174boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 175extern int zfs_sync_pass_deferred_free; 176 177#ifndef illumos 178extern void spa_deadman(void *arg); 179#endif 180 181/* 182 * This (illegal) pool name is used when temporarily importing a spa_t in order 183 * to get the vdev stats associated with the imported devices. 184 */ 185#define TRYIMPORT_NAME "$import" 186 187/* 188 * ========================================================================== 189 * SPA properties routines 190 * ========================================================================== 191 */ 192 193/* 194 * Add a (source=src, propname=propval) list to an nvlist. 195 */ 196static void 197spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 198 uint64_t intval, zprop_source_t src) 199{ 200 const char *propname = zpool_prop_to_name(prop); 201 nvlist_t *propval; 202 203 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 204 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 205 206 if (strval != NULL) 207 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 208 else 209 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 210 211 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 212 nvlist_free(propval); 213} 214 215/* 216 * Get property values from the spa configuration. 217 */ 218static void 219spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 220{ 221 vdev_t *rvd = spa->spa_root_vdev; 222 dsl_pool_t *pool = spa->spa_dsl_pool; 223 uint64_t size, alloc, cap, version; 224 zprop_source_t src = ZPROP_SRC_NONE; 225 spa_config_dirent_t *dp; 226 metaslab_class_t *mc = spa_normal_class(spa); 227 228 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 229 230 if (rvd != NULL) { 231 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 232 size = metaslab_class_get_space(spa_normal_class(spa)); 233 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 234 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 235 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 236 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 237 size - alloc, src); 238 239 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 240 metaslab_class_fragmentation(mc), src); 241 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 242 metaslab_class_expandable_space(mc), src); 243 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 244 (spa_mode(spa) == FREAD), src); 245 246 cap = (size == 0) ? 0 : (alloc * 100 / size); 247 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 248 249 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 250 ddt_get_pool_dedup_ratio(spa), src); 251 252 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 253 rvd->vdev_state, src); 254 255 version = spa_version(spa); 256 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 257 src = ZPROP_SRC_DEFAULT; 258 else 259 src = ZPROP_SRC_LOCAL; 260 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 261 } 262 263 if (pool != NULL) { 264 /* 265 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 266 * when opening pools before this version freedir will be NULL. 267 */ 268 if (pool->dp_free_dir != NULL) { 269 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 270 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 271 src); 272 } else { 273 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 274 NULL, 0, src); 275 } 276 277 if (pool->dp_leak_dir != NULL) { 278 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 279 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 280 src); 281 } else { 282 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 283 NULL, 0, src); 284 } 285 } 286 287 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 288 289 if (spa->spa_comment != NULL) { 290 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 291 0, ZPROP_SRC_LOCAL); 292 } 293 294 if (spa->spa_root != NULL) 295 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 296 0, ZPROP_SRC_LOCAL); 297 298 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 299 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 300 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 301 } else { 302 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 303 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 304 } 305 306 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 307 if (dp->scd_path == NULL) { 308 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 309 "none", 0, ZPROP_SRC_LOCAL); 310 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 311 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 312 dp->scd_path, 0, ZPROP_SRC_LOCAL); 313 } 314 } 315} 316 317/* 318 * Get zpool property values. 319 */ 320int 321spa_prop_get(spa_t *spa, nvlist_t **nvp) 322{ 323 objset_t *mos = spa->spa_meta_objset; 324 zap_cursor_t zc; 325 zap_attribute_t za; 326 int err; 327 328 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 329 330 mutex_enter(&spa->spa_props_lock); 331 332 /* 333 * Get properties from the spa config. 334 */ 335 spa_prop_get_config(spa, nvp); 336 337 /* If no pool property object, no more prop to get. */ 338 if (mos == NULL || spa->spa_pool_props_object == 0) { 339 mutex_exit(&spa->spa_props_lock); 340 return (0); 341 } 342 343 /* 344 * Get properties from the MOS pool property object. 345 */ 346 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 347 (err = zap_cursor_retrieve(&zc, &za)) == 0; 348 zap_cursor_advance(&zc)) { 349 uint64_t intval = 0; 350 char *strval = NULL; 351 zprop_source_t src = ZPROP_SRC_DEFAULT; 352 zpool_prop_t prop; 353 354 if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL) 355 continue; 356 357 switch (za.za_integer_length) { 358 case 8: 359 /* integer property */ 360 if (za.za_first_integer != 361 zpool_prop_default_numeric(prop)) 362 src = ZPROP_SRC_LOCAL; 363 364 if (prop == ZPOOL_PROP_BOOTFS) { 365 dsl_pool_t *dp; 366 dsl_dataset_t *ds = NULL; 367 368 dp = spa_get_dsl(spa); 369 dsl_pool_config_enter(dp, FTAG); 370 if (err = dsl_dataset_hold_obj(dp, 371 za.za_first_integer, FTAG, &ds)) { 372 dsl_pool_config_exit(dp, FTAG); 373 break; 374 } 375 376 strval = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, 377 KM_SLEEP); 378 dsl_dataset_name(ds, strval); 379 dsl_dataset_rele(ds, FTAG); 380 dsl_pool_config_exit(dp, FTAG); 381 } else { 382 strval = NULL; 383 intval = za.za_first_integer; 384 } 385 386 spa_prop_add_list(*nvp, prop, strval, intval, src); 387 388 if (strval != NULL) 389 kmem_free(strval, ZFS_MAX_DATASET_NAME_LEN); 390 391 break; 392 393 case 1: 394 /* string property */ 395 strval = kmem_alloc(za.za_num_integers, KM_SLEEP); 396 err = zap_lookup(mos, spa->spa_pool_props_object, 397 za.za_name, 1, za.za_num_integers, strval); 398 if (err) { 399 kmem_free(strval, za.za_num_integers); 400 break; 401 } 402 spa_prop_add_list(*nvp, prop, strval, 0, src); 403 kmem_free(strval, za.za_num_integers); 404 break; 405 406 default: 407 break; 408 } 409 } 410 zap_cursor_fini(&zc); 411 mutex_exit(&spa->spa_props_lock); 412out: 413 if (err && err != ENOENT) { 414 nvlist_free(*nvp); 415 *nvp = NULL; 416 return (err); 417 } 418 419 return (0); 420} 421 422/* 423 * Validate the given pool properties nvlist and modify the list 424 * for the property values to be set. 425 */ 426static int 427spa_prop_validate(spa_t *spa, nvlist_t *props) 428{ 429 nvpair_t *elem; 430 int error = 0, reset_bootfs = 0; 431 uint64_t objnum = 0; 432 boolean_t has_feature = B_FALSE; 433 434 elem = NULL; 435 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { 436 uint64_t intval; 437 char *strval, *slash, *check, *fname; 438 const char *propname = nvpair_name(elem); 439 zpool_prop_t prop = zpool_name_to_prop(propname); 440 441 switch (prop) { 442 case ZPROP_INVAL: 443 if (!zpool_prop_feature(propname)) { 444 error = SET_ERROR(EINVAL); 445 break; 446 } 447 448 /* 449 * Sanitize the input. 450 */ 451 if (nvpair_type(elem) != DATA_TYPE_UINT64) { 452 error = SET_ERROR(EINVAL); 453 break; 454 } 455 456 if (nvpair_value_uint64(elem, &intval) != 0) { 457 error = SET_ERROR(EINVAL); 458 break; 459 } 460 461 if (intval != 0) { 462 error = SET_ERROR(EINVAL); 463 break; 464 } 465 466 fname = strchr(propname, '@') + 1; 467 if (zfeature_lookup_name(fname, NULL) != 0) { 468 error = SET_ERROR(EINVAL); 469 break; 470 } 471 472 has_feature = B_TRUE; 473 break; 474 475 case ZPOOL_PROP_VERSION: 476 error = nvpair_value_uint64(elem, &intval); 477 if (!error && 478 (intval < spa_version(spa) || 479 intval > SPA_VERSION_BEFORE_FEATURES || 480 has_feature)) 481 error = SET_ERROR(EINVAL); 482 break; 483 484 case ZPOOL_PROP_DELEGATION: 485 case ZPOOL_PROP_AUTOREPLACE: 486 case ZPOOL_PROP_LISTSNAPS: 487 case ZPOOL_PROP_AUTOEXPAND: 488 error = nvpair_value_uint64(elem, &intval); 489 if (!error && intval > 1) 490 error = SET_ERROR(EINVAL); 491 break; 492 493 case ZPOOL_PROP_BOOTFS: 494 /* 495 * If the pool version is less than SPA_VERSION_BOOTFS, 496 * or the pool is still being created (version == 0), 497 * the bootfs property cannot be set. 498 */ 499 if (spa_version(spa) < SPA_VERSION_BOOTFS) { 500 error = SET_ERROR(ENOTSUP); 501 break; 502 } 503 504 /* 505 * Make sure the vdev config is bootable 506 */ 507 if (!vdev_is_bootable(spa->spa_root_vdev)) { 508 error = SET_ERROR(ENOTSUP); 509 break; 510 } 511 512 reset_bootfs = 1; 513 514 error = nvpair_value_string(elem, &strval); 515 516 if (!error) { 517 objset_t *os; 518 uint64_t propval; 519 520 if (strval == NULL || strval[0] == '\0') { 521 objnum = zpool_prop_default_numeric( 522 ZPOOL_PROP_BOOTFS); 523 break; 524 } 525 526 if (error = dmu_objset_hold(strval, FTAG, &os)) 527 break; 528 529 /* 530 * Must be ZPL, and its property settings 531 * must be supported by GRUB (compression 532 * is not gzip, and large blocks are not used). 533 */ 534 535 if (dmu_objset_type(os) != DMU_OST_ZFS) { 536 error = SET_ERROR(ENOTSUP); 537 } else if ((error = 538 dsl_prop_get_int_ds(dmu_objset_ds(os), 539 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 540 &propval)) == 0 && 541 !BOOTFS_COMPRESS_VALID(propval)) { 542 error = SET_ERROR(ENOTSUP); 543 } else if ((error = 544 dsl_prop_get_int_ds(dmu_objset_ds(os), 545 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 546 &propval)) == 0 && 547 propval > SPA_OLD_MAXBLOCKSIZE) { 548 error = SET_ERROR(ENOTSUP); 549 } else { 550 objnum = dmu_objset_id(os); 551 } 552 dmu_objset_rele(os, FTAG); 553 } 554 break; 555 556 case ZPOOL_PROP_FAILUREMODE: 557 error = nvpair_value_uint64(elem, &intval); 558 if (!error && (intval < ZIO_FAILURE_MODE_WAIT || 559 intval > ZIO_FAILURE_MODE_PANIC)) 560 error = SET_ERROR(EINVAL); 561 562 /* 563 * This is a special case which only occurs when 564 * the pool has completely failed. This allows 565 * the user to change the in-core failmode property 566 * without syncing it out to disk (I/Os might 567 * currently be blocked). We do this by returning 568 * EIO to the caller (spa_prop_set) to trick it 569 * into thinking we encountered a property validation 570 * error. 571 */ 572 if (!error && spa_suspended(spa)) { 573 spa->spa_failmode = intval; 574 error = SET_ERROR(EIO); 575 } 576 break; 577 578 case ZPOOL_PROP_CACHEFILE: 579 if ((error = nvpair_value_string(elem, &strval)) != 0) 580 break; 581 582 if (strval[0] == '\0') 583 break; 584 585 if (strcmp(strval, "none") == 0) 586 break; 587 588 if (strval[0] != '/') { 589 error = SET_ERROR(EINVAL); 590 break; 591 } 592 593 slash = strrchr(strval, '/'); 594 ASSERT(slash != NULL); 595 596 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || 597 strcmp(slash, "/..") == 0) 598 error = SET_ERROR(EINVAL); 599 break; 600 601 case ZPOOL_PROP_COMMENT: 602 if ((error = nvpair_value_string(elem, &strval)) != 0) 603 break; 604 for (check = strval; *check != '\0'; check++) { 605 /* 606 * The kernel doesn't have an easy isprint() 607 * check. For this kernel check, we merely 608 * check ASCII apart from DEL. Fix this if 609 * there is an easy-to-use kernel isprint(). 610 */ 611 if (*check >= 0x7f) { 612 error = SET_ERROR(EINVAL); 613 break; 614 } 615 } 616 if (strlen(strval) > ZPROP_MAX_COMMENT) 617 error = E2BIG; 618 break; 619 620 case ZPOOL_PROP_DEDUPDITTO: 621 if (spa_version(spa) < SPA_VERSION_DEDUP) 622 error = SET_ERROR(ENOTSUP); 623 else 624 error = nvpair_value_uint64(elem, &intval); 625 if (error == 0 && 626 intval != 0 && intval < ZIO_DEDUPDITTO_MIN) 627 error = SET_ERROR(EINVAL); 628 break; 629 } 630 631 if (error) 632 break; 633 } 634 635 if (!error && reset_bootfs) { 636 error = nvlist_remove(props, 637 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); 638 639 if (!error) { 640 error = nvlist_add_uint64(props, 641 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); 642 } 643 } 644 645 return (error); 646} 647 648void 649spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) 650{ 651 char *cachefile; 652 spa_config_dirent_t *dp; 653 654 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), 655 &cachefile) != 0) 656 return; 657 658 dp = kmem_alloc(sizeof (spa_config_dirent_t), 659 KM_SLEEP); 660 661 if (cachefile[0] == '\0') 662 dp->scd_path = spa_strdup(spa_config_path); 663 else if (strcmp(cachefile, "none") == 0) 664 dp->scd_path = NULL; 665 else 666 dp->scd_path = spa_strdup(cachefile); 667 668 list_insert_head(&spa->spa_config_list, dp); 669 if (need_sync) 670 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 671} 672 673int 674spa_prop_set(spa_t *spa, nvlist_t *nvp) 675{ 676 int error; 677 nvpair_t *elem = NULL; 678 boolean_t need_sync = B_FALSE; 679 680 if ((error = spa_prop_validate(spa, nvp)) != 0) 681 return (error); 682 683 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { 684 zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); 685 686 if (prop == ZPOOL_PROP_CACHEFILE || 687 prop == ZPOOL_PROP_ALTROOT || 688 prop == ZPOOL_PROP_READONLY) 689 continue; 690 691 if (prop == ZPOOL_PROP_VERSION || prop == ZPROP_INVAL) { 692 uint64_t ver; 693 694 if (prop == ZPOOL_PROP_VERSION) { 695 VERIFY(nvpair_value_uint64(elem, &ver) == 0); 696 } else { 697 ASSERT(zpool_prop_feature(nvpair_name(elem))); 698 ver = SPA_VERSION_FEATURES; 699 need_sync = B_TRUE; 700 } 701 702 /* Save time if the version is already set. */ 703 if (ver == spa_version(spa)) 704 continue; 705 706 /* 707 * In addition to the pool directory object, we might 708 * create the pool properties object, the features for 709 * read object, the features for write object, or the 710 * feature descriptions object. 711 */ 712 error = dsl_sync_task(spa->spa_name, NULL, 713 spa_sync_version, &ver, 714 6, ZFS_SPACE_CHECK_RESERVED); 715 if (error) 716 return (error); 717 continue; 718 } 719 720 need_sync = B_TRUE; 721 break; 722 } 723 724 if (need_sync) { 725 return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, 726 nvp, 6, ZFS_SPACE_CHECK_RESERVED)); 727 } 728 729 return (0); 730} 731 732/* 733 * If the bootfs property value is dsobj, clear it. 734 */ 735void 736spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) 737{ 738 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { 739 VERIFY(zap_remove(spa->spa_meta_objset, 740 spa->spa_pool_props_object, 741 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); 742 spa->spa_bootfs = 0; 743 } 744} 745 746/*ARGSUSED*/ 747static int 748spa_change_guid_check(void *arg, dmu_tx_t *tx) 749{ 750 uint64_t *newguid = arg; 751 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 752 vdev_t *rvd = spa->spa_root_vdev; 753 uint64_t vdev_state; 754 755 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 756 vdev_state = rvd->vdev_state; 757 spa_config_exit(spa, SCL_STATE, FTAG); 758 759 if (vdev_state != VDEV_STATE_HEALTHY) 760 return (SET_ERROR(ENXIO)); 761 762 ASSERT3U(spa_guid(spa), !=, *newguid); 763 764 return (0); 765} 766 767static void 768spa_change_guid_sync(void *arg, dmu_tx_t *tx) 769{ 770 uint64_t *newguid = arg; 771 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 772 uint64_t oldguid; 773 vdev_t *rvd = spa->spa_root_vdev; 774 775 oldguid = spa_guid(spa); 776 777 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 778 rvd->vdev_guid = *newguid; 779 rvd->vdev_guid_sum += (*newguid - oldguid); 780 vdev_config_dirty(rvd); 781 spa_config_exit(spa, SCL_STATE, FTAG); 782 783 spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", 784 oldguid, *newguid); 785} 786 787/* 788 * Change the GUID for the pool. This is done so that we can later 789 * re-import a pool built from a clone of our own vdevs. We will modify 790 * the root vdev's guid, our own pool guid, and then mark all of our 791 * vdevs dirty. Note that we must make sure that all our vdevs are 792 * online when we do this, or else any vdevs that weren't present 793 * would be orphaned from our pool. We are also going to issue a 794 * sysevent to update any watchers. 795 */ 796int 797spa_change_guid(spa_t *spa) 798{ 799 int error; 800 uint64_t guid; 801 802 mutex_enter(&spa->spa_vdev_top_lock); 803 mutex_enter(&spa_namespace_lock); 804 guid = spa_generate_guid(NULL); 805 806 error = dsl_sync_task(spa->spa_name, spa_change_guid_check, 807 spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); 808 809 if (error == 0) { 810 spa_config_sync(spa, B_FALSE, B_TRUE); 811 spa_event_notify(spa, NULL, ESC_ZFS_POOL_REGUID); 812 } 813 814 mutex_exit(&spa_namespace_lock); 815 mutex_exit(&spa->spa_vdev_top_lock); 816 817 return (error); 818} 819 820/* 821 * ========================================================================== 822 * SPA state manipulation (open/create/destroy/import/export) 823 * ========================================================================== 824 */ 825 826static int 827spa_error_entry_compare(const void *a, const void *b) 828{ 829 spa_error_entry_t *sa = (spa_error_entry_t *)a; 830 spa_error_entry_t *sb = (spa_error_entry_t *)b; 831 int ret; 832 833 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark, 834 sizeof (zbookmark_phys_t)); 835 836 if (ret < 0) 837 return (-1); 838 else if (ret > 0) 839 return (1); 840 else 841 return (0); 842} 843 844/* 845 * Utility function which retrieves copies of the current logs and 846 * re-initializes them in the process. 847 */ 848void 849spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) 850{ 851 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); 852 853 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); 854 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); 855 856 avl_create(&spa->spa_errlist_scrub, 857 spa_error_entry_compare, sizeof (spa_error_entry_t), 858 offsetof(spa_error_entry_t, se_avl)); 859 avl_create(&spa->spa_errlist_last, 860 spa_error_entry_compare, sizeof (spa_error_entry_t), 861 offsetof(spa_error_entry_t, se_avl)); 862} 863 864static void 865spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 866{ 867 const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; 868 enum zti_modes mode = ztip->zti_mode; 869 uint_t value = ztip->zti_value; 870 uint_t count = ztip->zti_count; 871 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 872 char name[32]; 873 uint_t flags = 0; 874 boolean_t batch = B_FALSE; 875 876 if (mode == ZTI_MODE_NULL) { 877 tqs->stqs_count = 0; 878 tqs->stqs_taskq = NULL; 879 return; 880 } 881 882 ASSERT3U(count, >, 0); 883 884 tqs->stqs_count = count; 885 tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); 886 887 switch (mode) { 888 case ZTI_MODE_FIXED: 889 ASSERT3U(value, >=, 1); 890 value = MAX(value, 1); 891 break; 892 893 case ZTI_MODE_BATCH: 894 batch = B_TRUE; 895 flags |= TASKQ_THREADS_CPU_PCT; 896 value = zio_taskq_batch_pct; 897 break; 898 899 default: 900 panic("unrecognized mode for %s_%s taskq (%u:%u) in " 901 "spa_activate()", 902 zio_type_name[t], zio_taskq_types[q], mode, value); 903 break; 904 } 905 906 for (uint_t i = 0; i < count; i++) { 907 taskq_t *tq; 908 909 if (count > 1) { 910 (void) snprintf(name, sizeof (name), "%s_%s_%u", 911 zio_type_name[t], zio_taskq_types[q], i); 912 } else { 913 (void) snprintf(name, sizeof (name), "%s_%s", 914 zio_type_name[t], zio_taskq_types[q]); 915 } 916 917#ifdef SYSDC 918 if (zio_taskq_sysdc && spa->spa_proc != &p0) { 919 if (batch) 920 flags |= TASKQ_DC_BATCH; 921 922 tq = taskq_create_sysdc(name, value, 50, INT_MAX, 923 spa->spa_proc, zio_taskq_basedc, flags); 924 } else { 925#endif 926 pri_t pri = maxclsyspri; 927 /* 928 * The write issue taskq can be extremely CPU 929 * intensive. Run it at slightly lower priority 930 * than the other taskqs. 931 */ 932 if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) 933 pri++; 934 935 tq = taskq_create_proc(name, value, pri, 50, 936 INT_MAX, spa->spa_proc, flags); 937#ifdef SYSDC 938 } 939#endif 940 941 tqs->stqs_taskq[i] = tq; 942 } 943} 944 945static void 946spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 947{ 948 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 949 950 if (tqs->stqs_taskq == NULL) { 951 ASSERT0(tqs->stqs_count); 952 return; 953 } 954 955 for (uint_t i = 0; i < tqs->stqs_count; i++) { 956 ASSERT3P(tqs->stqs_taskq[i], !=, NULL); 957 taskq_destroy(tqs->stqs_taskq[i]); 958 } 959 960 kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); 961 tqs->stqs_taskq = NULL; 962} 963 964/* 965 * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. 966 * Note that a type may have multiple discrete taskqs to avoid lock contention 967 * on the taskq itself. In that case we choose which taskq at random by using 968 * the low bits of gethrtime(). 969 */ 970void 971spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, 972 task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) 973{ 974 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 975 taskq_t *tq; 976 977 ASSERT3P(tqs->stqs_taskq, !=, NULL); 978 ASSERT3U(tqs->stqs_count, !=, 0); 979 980 if (tqs->stqs_count == 1) { 981 tq = tqs->stqs_taskq[0]; 982 } else { 983#ifdef _KERNEL 984 tq = tqs->stqs_taskq[cpu_ticks() % tqs->stqs_count]; 985#else 986 tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; 987#endif 988 } 989 990 taskq_dispatch_ent(tq, func, arg, flags, ent); 991} 992 993static void 994spa_create_zio_taskqs(spa_t *spa) 995{ 996 for (int t = 0; t < ZIO_TYPES; t++) { 997 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 998 spa_taskqs_init(spa, t, q); 999 } 1000 } 1001} 1002 1003#ifdef _KERNEL 1004#ifdef SPA_PROCESS 1005static void 1006spa_thread(void *arg) 1007{ 1008 callb_cpr_t cprinfo; 1009 1010 spa_t *spa = arg; 1011 user_t *pu = PTOU(curproc); 1012 1013 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, 1014 spa->spa_name); 1015 1016 ASSERT(curproc != &p0); 1017 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), 1018 "zpool-%s", spa->spa_name); 1019 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); 1020 1021#ifdef PSRSET_BIND 1022 /* bind this thread to the requested psrset */ 1023 if (zio_taskq_psrset_bind != PS_NONE) { 1024 pool_lock(); 1025 mutex_enter(&cpu_lock); 1026 mutex_enter(&pidlock); 1027 mutex_enter(&curproc->p_lock); 1028 1029 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, 1030 0, NULL, NULL) == 0) { 1031 curthread->t_bind_pset = zio_taskq_psrset_bind; 1032 } else { 1033 cmn_err(CE_WARN, 1034 "Couldn't bind process for zfs pool \"%s\" to " 1035 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); 1036 } 1037 1038 mutex_exit(&curproc->p_lock); 1039 mutex_exit(&pidlock); 1040 mutex_exit(&cpu_lock); 1041 pool_unlock(); 1042 } 1043#endif 1044 1045#ifdef SYSDC 1046 if (zio_taskq_sysdc) { 1047 sysdc_thread_enter(curthread, 100, 0); 1048 } 1049#endif 1050 1051 spa->spa_proc = curproc; 1052 spa->spa_did = curthread->t_did; 1053 1054 spa_create_zio_taskqs(spa); 1055 1056 mutex_enter(&spa->spa_proc_lock); 1057 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); 1058 1059 spa->spa_proc_state = SPA_PROC_ACTIVE; 1060 cv_broadcast(&spa->spa_proc_cv); 1061 1062 CALLB_CPR_SAFE_BEGIN(&cprinfo); 1063 while (spa->spa_proc_state == SPA_PROC_ACTIVE) 1064 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1065 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); 1066 1067 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); 1068 spa->spa_proc_state = SPA_PROC_GONE; 1069 spa->spa_proc = &p0; 1070 cv_broadcast(&spa->spa_proc_cv); 1071 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ 1072 1073 mutex_enter(&curproc->p_lock); 1074 lwp_exit(); 1075} 1076#endif /* SPA_PROCESS */ 1077#endif 1078 1079/* 1080 * Activate an uninitialized pool. 1081 */ 1082static void 1083spa_activate(spa_t *spa, int mode) 1084{ 1085 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 1086 1087 spa->spa_state = POOL_STATE_ACTIVE; 1088 spa->spa_mode = mode; 1089 1090 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); 1091 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); 1092 1093 /* Try to create a covering process */ 1094 mutex_enter(&spa->spa_proc_lock); 1095 ASSERT(spa->spa_proc_state == SPA_PROC_NONE); 1096 ASSERT(spa->spa_proc == &p0); 1097 spa->spa_did = 0; 1098 1099#ifdef SPA_PROCESS 1100 /* Only create a process if we're going to be around a while. */ 1101 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { 1102 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, 1103 NULL, 0) == 0) { 1104 spa->spa_proc_state = SPA_PROC_CREATED; 1105 while (spa->spa_proc_state == SPA_PROC_CREATED) { 1106 cv_wait(&spa->spa_proc_cv, 1107 &spa->spa_proc_lock); 1108 } 1109 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1110 ASSERT(spa->spa_proc != &p0); 1111 ASSERT(spa->spa_did != 0); 1112 } else { 1113#ifdef _KERNEL 1114 cmn_err(CE_WARN, 1115 "Couldn't create process for zfs pool \"%s\"\n", 1116 spa->spa_name); 1117#endif 1118 } 1119 } 1120#endif /* SPA_PROCESS */ 1121 mutex_exit(&spa->spa_proc_lock); 1122 1123 /* If we didn't create a process, we need to create our taskqs. */ 1124 ASSERT(spa->spa_proc == &p0); 1125 if (spa->spa_proc == &p0) { 1126 spa_create_zio_taskqs(spa); 1127 } 1128 1129 /* 1130 * Start TRIM thread. 1131 */ 1132 trim_thread_create(spa); 1133 1134 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), 1135 offsetof(vdev_t, vdev_config_dirty_node)); 1136 list_create(&spa->spa_evicting_os_list, sizeof (objset_t), 1137 offsetof(objset_t, os_evicting_node)); 1138 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), 1139 offsetof(vdev_t, vdev_state_dirty_node)); 1140 1141 txg_list_create(&spa->spa_vdev_txg_list, 1142 offsetof(struct vdev, vdev_txg_node)); 1143 1144 avl_create(&spa->spa_errlist_scrub, 1145 spa_error_entry_compare, sizeof (spa_error_entry_t), 1146 offsetof(spa_error_entry_t, se_avl)); 1147 avl_create(&spa->spa_errlist_last, 1148 spa_error_entry_compare, sizeof (spa_error_entry_t), 1149 offsetof(spa_error_entry_t, se_avl)); 1150} 1151 1152/* 1153 * Opposite of spa_activate(). 1154 */ 1155static void 1156spa_deactivate(spa_t *spa) 1157{ 1158 ASSERT(spa->spa_sync_on == B_FALSE); 1159 ASSERT(spa->spa_dsl_pool == NULL); 1160 ASSERT(spa->spa_root_vdev == NULL); 1161 ASSERT(spa->spa_async_zio_root == NULL); 1162 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); 1163 1164 /* 1165 * Stop TRIM thread in case spa_unload() wasn't called directly 1166 * before spa_deactivate(). 1167 */ 1168 trim_thread_destroy(spa); 1169 1170 spa_evicting_os_wait(spa); 1171 1172 txg_list_destroy(&spa->spa_vdev_txg_list); 1173 1174 list_destroy(&spa->spa_config_dirty_list); 1175 list_destroy(&spa->spa_evicting_os_list); 1176 list_destroy(&spa->spa_state_dirty_list); 1177 1178 for (int t = 0; t < ZIO_TYPES; t++) { 1179 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1180 spa_taskqs_fini(spa, t, q); 1181 } 1182 } 1183 1184 metaslab_class_destroy(spa->spa_normal_class); 1185 spa->spa_normal_class = NULL; 1186 1187 metaslab_class_destroy(spa->spa_log_class); 1188 spa->spa_log_class = NULL; 1189 1190 /* 1191 * If this was part of an import or the open otherwise failed, we may 1192 * still have errors left in the queues. Empty them just in case. 1193 */ 1194 spa_errlog_drain(spa); 1195 1196 avl_destroy(&spa->spa_errlist_scrub); 1197 avl_destroy(&spa->spa_errlist_last); 1198 1199 spa->spa_state = POOL_STATE_UNINITIALIZED; 1200 1201 mutex_enter(&spa->spa_proc_lock); 1202 if (spa->spa_proc_state != SPA_PROC_NONE) { 1203 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1204 spa->spa_proc_state = SPA_PROC_DEACTIVATE; 1205 cv_broadcast(&spa->spa_proc_cv); 1206 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { 1207 ASSERT(spa->spa_proc != &p0); 1208 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1209 } 1210 ASSERT(spa->spa_proc_state == SPA_PROC_GONE); 1211 spa->spa_proc_state = SPA_PROC_NONE; 1212 } 1213 ASSERT(spa->spa_proc == &p0); 1214 mutex_exit(&spa->spa_proc_lock); 1215 1216#ifdef SPA_PROCESS 1217 /* 1218 * We want to make sure spa_thread() has actually exited the ZFS 1219 * module, so that the module can't be unloaded out from underneath 1220 * it. 1221 */ 1222 if (spa->spa_did != 0) { 1223 thread_join(spa->spa_did); 1224 spa->spa_did = 0; 1225 } 1226#endif /* SPA_PROCESS */ 1227} 1228 1229/* 1230 * Verify a pool configuration, and construct the vdev tree appropriately. This 1231 * will create all the necessary vdevs in the appropriate layout, with each vdev 1232 * in the CLOSED state. This will prep the pool before open/creation/import. 1233 * All vdev validation is done by the vdev_alloc() routine. 1234 */ 1235static int 1236spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, 1237 uint_t id, int atype) 1238{ 1239 nvlist_t **child; 1240 uint_t children; 1241 int error; 1242 1243 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) 1244 return (error); 1245 1246 if ((*vdp)->vdev_ops->vdev_op_leaf) 1247 return (0); 1248 1249 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1250 &child, &children); 1251 1252 if (error == ENOENT) 1253 return (0); 1254 1255 if (error) { 1256 vdev_free(*vdp); 1257 *vdp = NULL; 1258 return (SET_ERROR(EINVAL)); 1259 } 1260 1261 for (int c = 0; c < children; c++) { 1262 vdev_t *vd; 1263 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, 1264 atype)) != 0) { 1265 vdev_free(*vdp); 1266 *vdp = NULL; 1267 return (error); 1268 } 1269 } 1270 1271 ASSERT(*vdp != NULL); 1272 1273 return (0); 1274} 1275 1276/* 1277 * Opposite of spa_load(). 1278 */ 1279static void 1280spa_unload(spa_t *spa) 1281{ 1282 int i; 1283 1284 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1285 1286 /* 1287 * Stop TRIM thread. 1288 */ 1289 trim_thread_destroy(spa); 1290 1291 /* 1292 * Stop async tasks. 1293 */ 1294 spa_async_suspend(spa); 1295 1296 /* 1297 * Stop syncing. 1298 */ 1299 if (spa->spa_sync_on) { 1300 txg_sync_stop(spa->spa_dsl_pool); 1301 spa->spa_sync_on = B_FALSE; 1302 } 1303 1304 /* 1305 * Wait for any outstanding async I/O to complete. 1306 */ 1307 if (spa->spa_async_zio_root != NULL) { 1308 for (int i = 0; i < max_ncpus; i++) 1309 (void) zio_wait(spa->spa_async_zio_root[i]); 1310 kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); 1311 spa->spa_async_zio_root = NULL; 1312 } 1313 1314 bpobj_close(&spa->spa_deferred_bpobj); 1315 1316 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1317 1318 /* 1319 * Close all vdevs. 1320 */ 1321 if (spa->spa_root_vdev) 1322 vdev_free(spa->spa_root_vdev); 1323 ASSERT(spa->spa_root_vdev == NULL); 1324 1325 /* 1326 * Close the dsl pool. 1327 */ 1328 if (spa->spa_dsl_pool) { 1329 dsl_pool_close(spa->spa_dsl_pool); 1330 spa->spa_dsl_pool = NULL; 1331 spa->spa_meta_objset = NULL; 1332 } 1333 1334 ddt_unload(spa); 1335 1336 1337 /* 1338 * Drop and purge level 2 cache 1339 */ 1340 spa_l2cache_drop(spa); 1341 1342 for (i = 0; i < spa->spa_spares.sav_count; i++) 1343 vdev_free(spa->spa_spares.sav_vdevs[i]); 1344 if (spa->spa_spares.sav_vdevs) { 1345 kmem_free(spa->spa_spares.sav_vdevs, 1346 spa->spa_spares.sav_count * sizeof (void *)); 1347 spa->spa_spares.sav_vdevs = NULL; 1348 } 1349 if (spa->spa_spares.sav_config) { 1350 nvlist_free(spa->spa_spares.sav_config); 1351 spa->spa_spares.sav_config = NULL; 1352 } 1353 spa->spa_spares.sav_count = 0; 1354 1355 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 1356 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); 1357 vdev_free(spa->spa_l2cache.sav_vdevs[i]); 1358 } 1359 if (spa->spa_l2cache.sav_vdevs) { 1360 kmem_free(spa->spa_l2cache.sav_vdevs, 1361 spa->spa_l2cache.sav_count * sizeof (void *)); 1362 spa->spa_l2cache.sav_vdevs = NULL; 1363 } 1364 if (spa->spa_l2cache.sav_config) { 1365 nvlist_free(spa->spa_l2cache.sav_config); 1366 spa->spa_l2cache.sav_config = NULL; 1367 } 1368 spa->spa_l2cache.sav_count = 0; 1369 1370 spa->spa_async_suspended = 0; 1371 1372 if (spa->spa_comment != NULL) { 1373 spa_strfree(spa->spa_comment); 1374 spa->spa_comment = NULL; 1375 } 1376 1377 spa_config_exit(spa, SCL_ALL, FTAG); 1378} 1379 1380/* 1381 * Load (or re-load) the current list of vdevs describing the active spares for 1382 * this pool. When this is called, we have some form of basic information in 1383 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and 1384 * then re-generate a more complete list including status information. 1385 */ 1386static void 1387spa_load_spares(spa_t *spa) 1388{ 1389 nvlist_t **spares; 1390 uint_t nspares; 1391 int i; 1392 vdev_t *vd, *tvd; 1393 1394 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1395 1396 /* 1397 * First, close and free any existing spare vdevs. 1398 */ 1399 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1400 vd = spa->spa_spares.sav_vdevs[i]; 1401 1402 /* Undo the call to spa_activate() below */ 1403 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1404 B_FALSE)) != NULL && tvd->vdev_isspare) 1405 spa_spare_remove(tvd); 1406 vdev_close(vd); 1407 vdev_free(vd); 1408 } 1409 1410 if (spa->spa_spares.sav_vdevs) 1411 kmem_free(spa->spa_spares.sav_vdevs, 1412 spa->spa_spares.sav_count * sizeof (void *)); 1413 1414 if (spa->spa_spares.sav_config == NULL) 1415 nspares = 0; 1416 else 1417 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 1418 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 1419 1420 spa->spa_spares.sav_count = (int)nspares; 1421 spa->spa_spares.sav_vdevs = NULL; 1422 1423 if (nspares == 0) 1424 return; 1425 1426 /* 1427 * Construct the array of vdevs, opening them to get status in the 1428 * process. For each spare, there is potentially two different vdev_t 1429 * structures associated with it: one in the list of spares (used only 1430 * for basic validation purposes) and one in the active vdev 1431 * configuration (if it's spared in). During this phase we open and 1432 * validate each vdev on the spare list. If the vdev also exists in the 1433 * active configuration, then we also mark this vdev as an active spare. 1434 */ 1435 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *), 1436 KM_SLEEP); 1437 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1438 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, 1439 VDEV_ALLOC_SPARE) == 0); 1440 ASSERT(vd != NULL); 1441 1442 spa->spa_spares.sav_vdevs[i] = vd; 1443 1444 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1445 B_FALSE)) != NULL) { 1446 if (!tvd->vdev_isspare) 1447 spa_spare_add(tvd); 1448 1449 /* 1450 * We only mark the spare active if we were successfully 1451 * able to load the vdev. Otherwise, importing a pool 1452 * with a bad active spare would result in strange 1453 * behavior, because multiple pool would think the spare 1454 * is actively in use. 1455 * 1456 * There is a vulnerability here to an equally bizarre 1457 * circumstance, where a dead active spare is later 1458 * brought back to life (onlined or otherwise). Given 1459 * the rarity of this scenario, and the extra complexity 1460 * it adds, we ignore the possibility. 1461 */ 1462 if (!vdev_is_dead(tvd)) 1463 spa_spare_activate(tvd); 1464 } 1465 1466 vd->vdev_top = vd; 1467 vd->vdev_aux = &spa->spa_spares; 1468 1469 if (vdev_open(vd) != 0) 1470 continue; 1471 1472 if (vdev_validate_aux(vd) == 0) 1473 spa_spare_add(vd); 1474 } 1475 1476 /* 1477 * Recompute the stashed list of spares, with status information 1478 * this time. 1479 */ 1480 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, 1481 DATA_TYPE_NVLIST_ARRAY) == 0); 1482 1483 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), 1484 KM_SLEEP); 1485 for (i = 0; i < spa->spa_spares.sav_count; i++) 1486 spares[i] = vdev_config_generate(spa, 1487 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); 1488 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 1489 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); 1490 for (i = 0; i < spa->spa_spares.sav_count; i++) 1491 nvlist_free(spares[i]); 1492 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); 1493} 1494 1495/* 1496 * Load (or re-load) the current list of vdevs describing the active l2cache for 1497 * this pool. When this is called, we have some form of basic information in 1498 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and 1499 * then re-generate a more complete list including status information. 1500 * Devices which are already active have their details maintained, and are 1501 * not re-opened. 1502 */ 1503static void 1504spa_load_l2cache(spa_t *spa) 1505{ 1506 nvlist_t **l2cache; 1507 uint_t nl2cache; 1508 int i, j, oldnvdevs; 1509 uint64_t guid; 1510 vdev_t *vd, **oldvdevs, **newvdevs; 1511 spa_aux_vdev_t *sav = &spa->spa_l2cache; 1512 1513 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1514 1515 if (sav->sav_config != NULL) { 1516 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 1517 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 1518 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); 1519 } else { 1520 nl2cache = 0; 1521 newvdevs = NULL; 1522 } 1523 1524 oldvdevs = sav->sav_vdevs; 1525 oldnvdevs = sav->sav_count; 1526 sav->sav_vdevs = NULL; 1527 sav->sav_count = 0; 1528 1529 /* 1530 * Process new nvlist of vdevs. 1531 */ 1532 for (i = 0; i < nl2cache; i++) { 1533 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, 1534 &guid) == 0); 1535 1536 newvdevs[i] = NULL; 1537 for (j = 0; j < oldnvdevs; j++) { 1538 vd = oldvdevs[j]; 1539 if (vd != NULL && guid == vd->vdev_guid) { 1540 /* 1541 * Retain previous vdev for add/remove ops. 1542 */ 1543 newvdevs[i] = vd; 1544 oldvdevs[j] = NULL; 1545 break; 1546 } 1547 } 1548 1549 if (newvdevs[i] == NULL) { 1550 /* 1551 * Create new vdev 1552 */ 1553 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, 1554 VDEV_ALLOC_L2CACHE) == 0); 1555 ASSERT(vd != NULL); 1556 newvdevs[i] = vd; 1557 1558 /* 1559 * Commit this vdev as an l2cache device, 1560 * even if it fails to open. 1561 */ 1562 spa_l2cache_add(vd); 1563 1564 vd->vdev_top = vd; 1565 vd->vdev_aux = sav; 1566 1567 spa_l2cache_activate(vd); 1568 1569 if (vdev_open(vd) != 0) 1570 continue; 1571 1572 (void) vdev_validate_aux(vd); 1573 1574 if (!vdev_is_dead(vd)) 1575 l2arc_add_vdev(spa, vd); 1576 } 1577 } 1578 1579 /* 1580 * Purge vdevs that were dropped 1581 */ 1582 for (i = 0; i < oldnvdevs; i++) { 1583 uint64_t pool; 1584 1585 vd = oldvdevs[i]; 1586 if (vd != NULL) { 1587 ASSERT(vd->vdev_isl2cache); 1588 1589 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 1590 pool != 0ULL && l2arc_vdev_present(vd)) 1591 l2arc_remove_vdev(vd); 1592 vdev_clear_stats(vd); 1593 vdev_free(vd); 1594 } 1595 } 1596 1597 if (oldvdevs) 1598 kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); 1599 1600 if (sav->sav_config == NULL) 1601 goto out; 1602 1603 sav->sav_vdevs = newvdevs; 1604 sav->sav_count = (int)nl2cache; 1605 1606 /* 1607 * Recompute the stashed list of l2cache devices, with status 1608 * information this time. 1609 */ 1610 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, 1611 DATA_TYPE_NVLIST_ARRAY) == 0); 1612 1613 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 1614 for (i = 0; i < sav->sav_count; i++) 1615 l2cache[i] = vdev_config_generate(spa, 1616 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); 1617 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 1618 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); 1619out: 1620 for (i = 0; i < sav->sav_count; i++) 1621 nvlist_free(l2cache[i]); 1622 if (sav->sav_count) 1623 kmem_free(l2cache, sav->sav_count * sizeof (void *)); 1624} 1625 1626static int 1627load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) 1628{ 1629 dmu_buf_t *db; 1630 char *packed = NULL; 1631 size_t nvsize = 0; 1632 int error; 1633 *value = NULL; 1634 1635 error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); 1636 if (error != 0) 1637 return (error); 1638 1639 nvsize = *(uint64_t *)db->db_data; 1640 dmu_buf_rele(db, FTAG); 1641 1642 packed = kmem_alloc(nvsize, KM_SLEEP); 1643 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, 1644 DMU_READ_PREFETCH); 1645 if (error == 0) 1646 error = nvlist_unpack(packed, nvsize, value, 0); 1647 kmem_free(packed, nvsize); 1648 1649 return (error); 1650} 1651 1652/* 1653 * Checks to see if the given vdev could not be opened, in which case we post a 1654 * sysevent to notify the autoreplace code that the device has been removed. 1655 */ 1656static void 1657spa_check_removed(vdev_t *vd) 1658{ 1659 for (int c = 0; c < vd->vdev_children; c++) 1660 spa_check_removed(vd->vdev_child[c]); 1661 1662 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && 1663 !vd->vdev_ishole) { 1664 zfs_post_autoreplace(vd->vdev_spa, vd); 1665 spa_event_notify(vd->vdev_spa, vd, ESC_ZFS_VDEV_CHECK); 1666 } 1667} 1668 1669/* 1670 * Validate the current config against the MOS config 1671 */ 1672static boolean_t 1673spa_config_valid(spa_t *spa, nvlist_t *config) 1674{ 1675 vdev_t *mrvd, *rvd = spa->spa_root_vdev; 1676 nvlist_t *nv; 1677 1678 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) == 0); 1679 1680 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1681 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); 1682 1683 ASSERT3U(rvd->vdev_children, ==, mrvd->vdev_children); 1684 1685 /* 1686 * If we're doing a normal import, then build up any additional 1687 * diagnostic information about missing devices in this config. 1688 * We'll pass this up to the user for further processing. 1689 */ 1690 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { 1691 nvlist_t **child, *nv; 1692 uint64_t idx = 0; 1693 1694 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **), 1695 KM_SLEEP); 1696 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1697 1698 for (int c = 0; c < rvd->vdev_children; c++) { 1699 vdev_t *tvd = rvd->vdev_child[c]; 1700 vdev_t *mtvd = mrvd->vdev_child[c]; 1701 1702 if (tvd->vdev_ops == &vdev_missing_ops && 1703 mtvd->vdev_ops != &vdev_missing_ops && 1704 mtvd->vdev_islog) 1705 child[idx++] = vdev_config_generate(spa, mtvd, 1706 B_FALSE, 0); 1707 } 1708 1709 if (idx) { 1710 VERIFY(nvlist_add_nvlist_array(nv, 1711 ZPOOL_CONFIG_CHILDREN, child, idx) == 0); 1712 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 1713 ZPOOL_CONFIG_MISSING_DEVICES, nv) == 0); 1714 1715 for (int i = 0; i < idx; i++) 1716 nvlist_free(child[i]); 1717 } 1718 nvlist_free(nv); 1719 kmem_free(child, rvd->vdev_children * sizeof (char **)); 1720 } 1721 1722 /* 1723 * Compare the root vdev tree with the information we have 1724 * from the MOS config (mrvd). Check each top-level vdev 1725 * with the corresponding MOS config top-level (mtvd). 1726 */ 1727 for (int c = 0; c < rvd->vdev_children; c++) { 1728 vdev_t *tvd = rvd->vdev_child[c]; 1729 vdev_t *mtvd = mrvd->vdev_child[c]; 1730 1731 /* 1732 * Resolve any "missing" vdevs in the current configuration. 1733 * If we find that the MOS config has more accurate information 1734 * about the top-level vdev then use that vdev instead. 1735 */ 1736 if (tvd->vdev_ops == &vdev_missing_ops && 1737 mtvd->vdev_ops != &vdev_missing_ops) { 1738 1739 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) 1740 continue; 1741 1742 /* 1743 * Device specific actions. 1744 */ 1745 if (mtvd->vdev_islog) { 1746 spa_set_log_state(spa, SPA_LOG_CLEAR); 1747 } else { 1748 /* 1749 * XXX - once we have 'readonly' pool 1750 * support we should be able to handle 1751 * missing data devices by transitioning 1752 * the pool to readonly. 1753 */ 1754 continue; 1755 } 1756 1757 /* 1758 * Swap the missing vdev with the data we were 1759 * able to obtain from the MOS config. 1760 */ 1761 vdev_remove_child(rvd, tvd); 1762 vdev_remove_child(mrvd, mtvd); 1763 1764 vdev_add_child(rvd, mtvd); 1765 vdev_add_child(mrvd, tvd); 1766 1767 spa_config_exit(spa, SCL_ALL, FTAG); 1768 vdev_load(mtvd); 1769 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1770 1771 vdev_reopen(rvd); 1772 } else if (mtvd->vdev_islog) { 1773 /* 1774 * Load the slog device's state from the MOS config 1775 * since it's possible that the label does not 1776 * contain the most up-to-date information. 1777 */ 1778 vdev_load_log_state(tvd, mtvd); 1779 vdev_reopen(tvd); 1780 } 1781 } 1782 vdev_free(mrvd); 1783 spa_config_exit(spa, SCL_ALL, FTAG); 1784 1785 /* 1786 * Ensure we were able to validate the config. 1787 */ 1788 return (rvd->vdev_guid_sum == spa->spa_uberblock.ub_guid_sum); 1789} 1790 1791/* 1792 * Check for missing log devices 1793 */ 1794static boolean_t 1795spa_check_logs(spa_t *spa) 1796{ 1797 boolean_t rv = B_FALSE; 1798 dsl_pool_t *dp = spa_get_dsl(spa); 1799 1800 switch (spa->spa_log_state) { 1801 case SPA_LOG_MISSING: 1802 /* need to recheck in case slog has been restored */ 1803 case SPA_LOG_UNKNOWN: 1804 rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 1805 zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0); 1806 if (rv) 1807 spa_set_log_state(spa, SPA_LOG_MISSING); 1808 break; 1809 } 1810 return (rv); 1811} 1812 1813static boolean_t 1814spa_passivate_log(spa_t *spa) 1815{ 1816 vdev_t *rvd = spa->spa_root_vdev; 1817 boolean_t slog_found = B_FALSE; 1818 1819 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1820 1821 if (!spa_has_slogs(spa)) 1822 return (B_FALSE); 1823 1824 for (int c = 0; c < rvd->vdev_children; c++) { 1825 vdev_t *tvd = rvd->vdev_child[c]; 1826 metaslab_group_t *mg = tvd->vdev_mg; 1827 1828 if (tvd->vdev_islog) { 1829 metaslab_group_passivate(mg); 1830 slog_found = B_TRUE; 1831 } 1832 } 1833 1834 return (slog_found); 1835} 1836 1837static void 1838spa_activate_log(spa_t *spa) 1839{ 1840 vdev_t *rvd = spa->spa_root_vdev; 1841 1842 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1843 1844 for (int c = 0; c < rvd->vdev_children; c++) { 1845 vdev_t *tvd = rvd->vdev_child[c]; 1846 metaslab_group_t *mg = tvd->vdev_mg; 1847 1848 if (tvd->vdev_islog) 1849 metaslab_group_activate(mg); 1850 } 1851} 1852 1853int 1854spa_offline_log(spa_t *spa) 1855{ 1856 int error; 1857 1858 error = dmu_objset_find(spa_name(spa), zil_vdev_offline, 1859 NULL, DS_FIND_CHILDREN); 1860 if (error == 0) { 1861 /* 1862 * We successfully offlined the log device, sync out the 1863 * current txg so that the "stubby" block can be removed 1864 * by zil_sync(). 1865 */ 1866 txg_wait_synced(spa->spa_dsl_pool, 0); 1867 } 1868 return (error); 1869} 1870 1871static void 1872spa_aux_check_removed(spa_aux_vdev_t *sav) 1873{ 1874 int i; 1875 1876 for (i = 0; i < sav->sav_count; i++) 1877 spa_check_removed(sav->sav_vdevs[i]); 1878} 1879 1880void 1881spa_claim_notify(zio_t *zio) 1882{ 1883 spa_t *spa = zio->io_spa; 1884 1885 if (zio->io_error) 1886 return; 1887 1888 mutex_enter(&spa->spa_props_lock); /* any mutex will do */ 1889 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) 1890 spa->spa_claim_max_txg = zio->io_bp->blk_birth; 1891 mutex_exit(&spa->spa_props_lock); 1892} 1893 1894typedef struct spa_load_error { 1895 uint64_t sle_meta_count; 1896 uint64_t sle_data_count; 1897} spa_load_error_t; 1898 1899static void 1900spa_load_verify_done(zio_t *zio) 1901{ 1902 blkptr_t *bp = zio->io_bp; 1903 spa_load_error_t *sle = zio->io_private; 1904 dmu_object_type_t type = BP_GET_TYPE(bp); 1905 int error = zio->io_error; 1906 spa_t *spa = zio->io_spa; 1907 1908 if (error) { 1909 if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && 1910 type != DMU_OT_INTENT_LOG) 1911 atomic_inc_64(&sle->sle_meta_count); 1912 else 1913 atomic_inc_64(&sle->sle_data_count); 1914 } 1915 zio_data_buf_free(zio->io_data, zio->io_size); 1916 1917 mutex_enter(&spa->spa_scrub_lock); 1918 spa->spa_scrub_inflight--; 1919 cv_broadcast(&spa->spa_scrub_io_cv); 1920 mutex_exit(&spa->spa_scrub_lock); 1921} 1922 1923/* 1924 * Maximum number of concurrent scrub i/os to create while verifying 1925 * a pool while importing it. 1926 */ 1927int spa_load_verify_maxinflight = 10000; 1928boolean_t spa_load_verify_metadata = B_TRUE; 1929boolean_t spa_load_verify_data = B_TRUE; 1930 1931SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_maxinflight, CTLFLAG_RWTUN, 1932 &spa_load_verify_maxinflight, 0, 1933 "Maximum number of concurrent scrub I/Os to create while verifying a " 1934 "pool while importing it"); 1935 1936SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_metadata, CTLFLAG_RWTUN, 1937 &spa_load_verify_metadata, 0, 1938 "Check metadata on import?"); 1939 1940SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_data, CTLFLAG_RWTUN, 1941 &spa_load_verify_data, 0, 1942 "Check user data on import?"); 1943 1944/*ARGSUSED*/ 1945static int 1946spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1947 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1948{ 1949 if (bp == NULL || BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 1950 return (0); 1951 /* 1952 * Note: normally this routine will not be called if 1953 * spa_load_verify_metadata is not set. However, it may be useful 1954 * to manually set the flag after the traversal has begun. 1955 */ 1956 if (!spa_load_verify_metadata) 1957 return (0); 1958 if (BP_GET_BUFC_TYPE(bp) == ARC_BUFC_DATA && !spa_load_verify_data) 1959 return (0); 1960 1961 zio_t *rio = arg; 1962 size_t size = BP_GET_PSIZE(bp); 1963 void *data = zio_data_buf_alloc(size); 1964 1965 mutex_enter(&spa->spa_scrub_lock); 1966 while (spa->spa_scrub_inflight >= spa_load_verify_maxinflight) 1967 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 1968 spa->spa_scrub_inflight++; 1969 mutex_exit(&spa->spa_scrub_lock); 1970 1971 zio_nowait(zio_read(rio, spa, bp, data, size, 1972 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, 1973 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | 1974 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); 1975 return (0); 1976} 1977 1978/* ARGSUSED */ 1979int 1980verify_dataset_name_len(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) 1981{ 1982 if (dsl_dataset_namelen(ds) >= ZFS_MAX_DATASET_NAME_LEN) 1983 return (SET_ERROR(ENAMETOOLONG)); 1984 1985 return (0); 1986} 1987 1988static int 1989spa_load_verify(spa_t *spa) 1990{ 1991 zio_t *rio; 1992 spa_load_error_t sle = { 0 }; 1993 zpool_rewind_policy_t policy; 1994 boolean_t verify_ok = B_FALSE; 1995 int error = 0; 1996 1997 zpool_get_rewind_policy(spa->spa_config, &policy); 1998 1999 if (policy.zrp_request & ZPOOL_NEVER_REWIND) 2000 return (0); 2001 2002 dsl_pool_config_enter(spa->spa_dsl_pool, FTAG); 2003 error = dmu_objset_find_dp(spa->spa_dsl_pool, 2004 spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL, 2005 DS_FIND_CHILDREN); 2006 dsl_pool_config_exit(spa->spa_dsl_pool, FTAG); 2007 if (error != 0) 2008 return (error); 2009 2010 rio = zio_root(spa, NULL, &sle, 2011 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 2012 2013 if (spa_load_verify_metadata) { 2014 error = traverse_pool(spa, spa->spa_verify_min_txg, 2015 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 2016 spa_load_verify_cb, rio); 2017 } 2018 2019 (void) zio_wait(rio); 2020 2021 spa->spa_load_meta_errors = sle.sle_meta_count; 2022 spa->spa_load_data_errors = sle.sle_data_count; 2023 2024 if (!error && sle.sle_meta_count <= policy.zrp_maxmeta && 2025 sle.sle_data_count <= policy.zrp_maxdata) { 2026 int64_t loss = 0; 2027 2028 verify_ok = B_TRUE; 2029 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 2030 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 2031 2032 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 2033 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2034 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 2035 VERIFY(nvlist_add_int64(spa->spa_load_info, 2036 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 2037 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2038 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 2039 } else { 2040 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 2041 } 2042 2043 if (error) { 2044 if (error != ENXIO && error != EIO) 2045 error = SET_ERROR(EIO); 2046 return (error); 2047 } 2048 2049 return (verify_ok ? 0 : EIO); 2050} 2051 2052/* 2053 * Find a value in the pool props object. 2054 */ 2055static void 2056spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2057{ 2058 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2059 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2060} 2061 2062/* 2063 * Find a value in the pool directory object. 2064 */ 2065static int 2066spa_dir_prop(spa_t *spa, const char *name, uint64_t *val) 2067{ 2068 return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2069 name, sizeof (uint64_t), 1, val)); 2070} 2071 2072static int 2073spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2074{ 2075 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2076 return (err); 2077} 2078 2079/* 2080 * Fix up config after a partly-completed split. This is done with the 2081 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2082 * pool have that entry in their config, but only the splitting one contains 2083 * a list of all the guids of the vdevs that are being split off. 2084 * 2085 * This function determines what to do with that list: either rejoin 2086 * all the disks to the pool, or complete the splitting process. To attempt 2087 * the rejoin, each disk that is offlined is marked online again, and 2088 * we do a reopen() call. If the vdev label for every disk that was 2089 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2090 * then we call vdev_split() on each disk, and complete the split. 2091 * 2092 * Otherwise we leave the config alone, with all the vdevs in place in 2093 * the original pool. 2094 */ 2095static void 2096spa_try_repair(spa_t *spa, nvlist_t *config) 2097{ 2098 uint_t extracted; 2099 uint64_t *glist; 2100 uint_t i, gcount; 2101 nvlist_t *nvl; 2102 vdev_t **vd; 2103 boolean_t attempt_reopen; 2104 2105 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2106 return; 2107 2108 /* check that the config is complete */ 2109 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2110 &glist, &gcount) != 0) 2111 return; 2112 2113 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2114 2115 /* attempt to online all the vdevs & validate */ 2116 attempt_reopen = B_TRUE; 2117 for (i = 0; i < gcount; i++) { 2118 if (glist[i] == 0) /* vdev is hole */ 2119 continue; 2120 2121 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2122 if (vd[i] == NULL) { 2123 /* 2124 * Don't bother attempting to reopen the disks; 2125 * just do the split. 2126 */ 2127 attempt_reopen = B_FALSE; 2128 } else { 2129 /* attempt to re-online it */ 2130 vd[i]->vdev_offline = B_FALSE; 2131 } 2132 } 2133 2134 if (attempt_reopen) { 2135 vdev_reopen(spa->spa_root_vdev); 2136 2137 /* check each device to see what state it's in */ 2138 for (extracted = 0, i = 0; i < gcount; i++) { 2139 if (vd[i] != NULL && 2140 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2141 break; 2142 ++extracted; 2143 } 2144 } 2145 2146 /* 2147 * If every disk has been moved to the new pool, or if we never 2148 * even attempted to look at them, then we split them off for 2149 * good. 2150 */ 2151 if (!attempt_reopen || gcount == extracted) { 2152 for (i = 0; i < gcount; i++) 2153 if (vd[i] != NULL) 2154 vdev_split(vd[i]); 2155 vdev_reopen(spa->spa_root_vdev); 2156 } 2157 2158 kmem_free(vd, gcount * sizeof (vdev_t *)); 2159} 2160 2161static int 2162spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type, 2163 boolean_t mosconfig) 2164{ 2165 nvlist_t *config = spa->spa_config; 2166 char *ereport = FM_EREPORT_ZFS_POOL; 2167 char *comment; 2168 int error; 2169 uint64_t pool_guid; 2170 nvlist_t *nvl; 2171 2172 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) 2173 return (SET_ERROR(EINVAL)); 2174 2175 ASSERT(spa->spa_comment == NULL); 2176 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2177 spa->spa_comment = spa_strdup(comment); 2178 2179 /* 2180 * Versioning wasn't explicitly added to the label until later, so if 2181 * it's not present treat it as the initial version. 2182 */ 2183 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2184 &spa->spa_ubsync.ub_version) != 0) 2185 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2186 2187 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2188 &spa->spa_config_txg); 2189 2190 if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) && 2191 spa_guid_exists(pool_guid, 0)) { 2192 error = SET_ERROR(EEXIST); 2193 } else { 2194 spa->spa_config_guid = pool_guid; 2195 2196 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, 2197 &nvl) == 0) { 2198 VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting, 2199 KM_SLEEP) == 0); 2200 } 2201 2202 nvlist_free(spa->spa_load_info); 2203 spa->spa_load_info = fnvlist_alloc(); 2204 2205 gethrestime(&spa->spa_loaded_ts); 2206 error = spa_load_impl(spa, pool_guid, config, state, type, 2207 mosconfig, &ereport); 2208 } 2209 2210 /* 2211 * Don't count references from objsets that are already closed 2212 * and are making their way through the eviction process. 2213 */ 2214 spa_evicting_os_wait(spa); 2215 spa->spa_minref = refcount_count(&spa->spa_refcount); 2216 if (error) { 2217 if (error != EEXIST) { 2218 spa->spa_loaded_ts.tv_sec = 0; 2219 spa->spa_loaded_ts.tv_nsec = 0; 2220 } 2221 if (error != EBADF) { 2222 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2223 } 2224 } 2225 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2226 spa->spa_ena = 0; 2227 2228 return (error); 2229} 2230 2231/* 2232 * Load an existing storage pool, using the pool's builtin spa_config as a 2233 * source of configuration information. 2234 */ 2235static int 2236spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config, 2237 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 2238 char **ereport) 2239{ 2240 int error = 0; 2241 nvlist_t *nvroot = NULL; 2242 nvlist_t *label; 2243 vdev_t *rvd; 2244 uberblock_t *ub = &spa->spa_uberblock; 2245 uint64_t children, config_cache_txg = spa->spa_config_txg; 2246 int orig_mode = spa->spa_mode; 2247 int parse; 2248 uint64_t obj; 2249 boolean_t missing_feat_write = B_FALSE; 2250 2251 /* 2252 * If this is an untrusted config, access the pool in read-only mode. 2253 * This prevents things like resilvering recently removed devices. 2254 */ 2255 if (!mosconfig) 2256 spa->spa_mode = FREAD; 2257 2258 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2259 2260 spa->spa_load_state = state; 2261 2262 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot)) 2263 return (SET_ERROR(EINVAL)); 2264 2265 parse = (type == SPA_IMPORT_EXISTING ? 2266 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2267 2268 /* 2269 * Create "The Godfather" zio to hold all async IOs 2270 */ 2271 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2272 KM_SLEEP); 2273 for (int i = 0; i < max_ncpus; i++) { 2274 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2275 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2276 ZIO_FLAG_GODFATHER); 2277 } 2278 2279 /* 2280 * Parse the configuration into a vdev tree. We explicitly set the 2281 * value that will be returned by spa_version() since parsing the 2282 * configuration requires knowing the version number. 2283 */ 2284 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2285 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse); 2286 spa_config_exit(spa, SCL_ALL, FTAG); 2287 2288 if (error != 0) 2289 return (error); 2290 2291 ASSERT(spa->spa_root_vdev == rvd); 2292 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2293 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2294 2295 if (type != SPA_IMPORT_ASSEMBLE) { 2296 ASSERT(spa_guid(spa) == pool_guid); 2297 } 2298 2299 /* 2300 * Try to open all vdevs, loading each label in the process. 2301 */ 2302 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2303 error = vdev_open(rvd); 2304 spa_config_exit(spa, SCL_ALL, FTAG); 2305 if (error != 0) 2306 return (error); 2307 2308 /* 2309 * We need to validate the vdev labels against the configuration that 2310 * we have in hand, which is dependent on the setting of mosconfig. If 2311 * mosconfig is true then we're validating the vdev labels based on 2312 * that config. Otherwise, we're validating against the cached config 2313 * (zpool.cache) that was read when we loaded the zfs module, and then 2314 * later we will recursively call spa_load() and validate against 2315 * the vdev config. 2316 * 2317 * If we're assembling a new pool that's been split off from an 2318 * existing pool, the labels haven't yet been updated so we skip 2319 * validation for now. 2320 */ 2321 if (type != SPA_IMPORT_ASSEMBLE) { 2322 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2323 error = vdev_validate(rvd, mosconfig); 2324 spa_config_exit(spa, SCL_ALL, FTAG); 2325 2326 if (error != 0) 2327 return (error); 2328 2329 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2330 return (SET_ERROR(ENXIO)); 2331 } 2332 2333 /* 2334 * Find the best uberblock. 2335 */ 2336 vdev_uberblock_load(rvd, ub, &label); 2337 2338 /* 2339 * If we weren't able to find a single valid uberblock, return failure. 2340 */ 2341 if (ub->ub_txg == 0) { 2342 nvlist_free(label); 2343 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2344 } 2345 2346 /* 2347 * If the pool has an unsupported version we can't open it. 2348 */ 2349 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2350 nvlist_free(label); 2351 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2352 } 2353 2354 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2355 nvlist_t *features; 2356 2357 /* 2358 * If we weren't able to find what's necessary for reading the 2359 * MOS in the label, return failure. 2360 */ 2361 if (label == NULL || nvlist_lookup_nvlist(label, 2362 ZPOOL_CONFIG_FEATURES_FOR_READ, &features) != 0) { 2363 nvlist_free(label); 2364 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2365 ENXIO)); 2366 } 2367 2368 /* 2369 * Update our in-core representation with the definitive values 2370 * from the label. 2371 */ 2372 nvlist_free(spa->spa_label_features); 2373 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2374 } 2375 2376 nvlist_free(label); 2377 2378 /* 2379 * Look through entries in the label nvlist's features_for_read. If 2380 * there is a feature listed there which we don't understand then we 2381 * cannot open a pool. 2382 */ 2383 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2384 nvlist_t *unsup_feat; 2385 2386 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2387 0); 2388 2389 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2390 NULL); nvp != NULL; 2391 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2392 if (!zfeature_is_supported(nvpair_name(nvp))) { 2393 VERIFY(nvlist_add_string(unsup_feat, 2394 nvpair_name(nvp), "") == 0); 2395 } 2396 } 2397 2398 if (!nvlist_empty(unsup_feat)) { 2399 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2400 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2401 nvlist_free(unsup_feat); 2402 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2403 ENOTSUP)); 2404 } 2405 2406 nvlist_free(unsup_feat); 2407 } 2408 2409 /* 2410 * If the vdev guid sum doesn't match the uberblock, we have an 2411 * incomplete configuration. We first check to see if the pool 2412 * is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN). 2413 * If it is, defer the vdev_guid_sum check till later so we 2414 * can handle missing vdevs. 2415 */ 2416 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, 2417 &children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE && 2418 rvd->vdev_guid_sum != ub->ub_guid_sum) 2419 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2420 2421 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2422 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2423 spa_try_repair(spa, config); 2424 spa_config_exit(spa, SCL_ALL, FTAG); 2425 nvlist_free(spa->spa_config_splitting); 2426 spa->spa_config_splitting = NULL; 2427 } 2428 2429 /* 2430 * Initialize internal SPA structures. 2431 */ 2432 spa->spa_state = POOL_STATE_ACTIVE; 2433 spa->spa_ubsync = spa->spa_uberblock; 2434 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2435 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2436 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2437 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2438 spa->spa_claim_max_txg = spa->spa_first_txg; 2439 spa->spa_prev_software_version = ub->ub_software_version; 2440 2441 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2442 if (error) 2443 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2444 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2445 2446 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0) 2447 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2448 2449 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2450 boolean_t missing_feat_read = B_FALSE; 2451 nvlist_t *unsup_feat, *enabled_feat; 2452 2453 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2454 &spa->spa_feat_for_read_obj) != 0) { 2455 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2456 } 2457 2458 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2459 &spa->spa_feat_for_write_obj) != 0) { 2460 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2461 } 2462 2463 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 2464 &spa->spa_feat_desc_obj) != 0) { 2465 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2466 } 2467 2468 enabled_feat = fnvlist_alloc(); 2469 unsup_feat = fnvlist_alloc(); 2470 2471 if (!spa_features_check(spa, B_FALSE, 2472 unsup_feat, enabled_feat)) 2473 missing_feat_read = B_TRUE; 2474 2475 if (spa_writeable(spa) || state == SPA_LOAD_TRYIMPORT) { 2476 if (!spa_features_check(spa, B_TRUE, 2477 unsup_feat, enabled_feat)) { 2478 missing_feat_write = B_TRUE; 2479 } 2480 } 2481 2482 fnvlist_add_nvlist(spa->spa_load_info, 2483 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 2484 2485 if (!nvlist_empty(unsup_feat)) { 2486 fnvlist_add_nvlist(spa->spa_load_info, 2487 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 2488 } 2489 2490 fnvlist_free(enabled_feat); 2491 fnvlist_free(unsup_feat); 2492 2493 if (!missing_feat_read) { 2494 fnvlist_add_boolean(spa->spa_load_info, 2495 ZPOOL_CONFIG_CAN_RDONLY); 2496 } 2497 2498 /* 2499 * If the state is SPA_LOAD_TRYIMPORT, our objective is 2500 * twofold: to determine whether the pool is available for 2501 * import in read-write mode and (if it is not) whether the 2502 * pool is available for import in read-only mode. If the pool 2503 * is available for import in read-write mode, it is displayed 2504 * as available in userland; if it is not available for import 2505 * in read-only mode, it is displayed as unavailable in 2506 * userland. If the pool is available for import in read-only 2507 * mode but not read-write mode, it is displayed as unavailable 2508 * in userland with a special note that the pool is actually 2509 * available for open in read-only mode. 2510 * 2511 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 2512 * missing a feature for write, we must first determine whether 2513 * the pool can be opened read-only before returning to 2514 * userland in order to know whether to display the 2515 * abovementioned note. 2516 */ 2517 if (missing_feat_read || (missing_feat_write && 2518 spa_writeable(spa))) { 2519 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2520 ENOTSUP)); 2521 } 2522 2523 /* 2524 * Load refcounts for ZFS features from disk into an in-memory 2525 * cache during SPA initialization. 2526 */ 2527 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 2528 uint64_t refcount; 2529 2530 error = feature_get_refcount_from_disk(spa, 2531 &spa_feature_table[i], &refcount); 2532 if (error == 0) { 2533 spa->spa_feat_refcount_cache[i] = refcount; 2534 } else if (error == ENOTSUP) { 2535 spa->spa_feat_refcount_cache[i] = 2536 SPA_FEATURE_DISABLED; 2537 } else { 2538 return (spa_vdev_err(rvd, 2539 VDEV_AUX_CORRUPT_DATA, EIO)); 2540 } 2541 } 2542 } 2543 2544 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 2545 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 2546 &spa->spa_feat_enabled_txg_obj) != 0) 2547 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2548 } 2549 2550 spa->spa_is_initializing = B_TRUE; 2551 error = dsl_pool_open(spa->spa_dsl_pool); 2552 spa->spa_is_initializing = B_FALSE; 2553 if (error != 0) 2554 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2555 2556 if (!mosconfig) { 2557 uint64_t hostid; 2558 nvlist_t *policy = NULL, *nvconfig; 2559 2560 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2561 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2562 2563 if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig, 2564 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2565 char *hostname; 2566 unsigned long myhostid = 0; 2567 2568 VERIFY(nvlist_lookup_string(nvconfig, 2569 ZPOOL_CONFIG_HOSTNAME, &hostname) == 0); 2570 2571#ifdef _KERNEL 2572 myhostid = zone_get_hostid(NULL); 2573#else /* _KERNEL */ 2574 /* 2575 * We're emulating the system's hostid in userland, so 2576 * we can't use zone_get_hostid(). 2577 */ 2578 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid); 2579#endif /* _KERNEL */ 2580 if (check_hostid && hostid != 0 && myhostid != 0 && 2581 hostid != myhostid) { 2582 nvlist_free(nvconfig); 2583 cmn_err(CE_WARN, "pool '%s' could not be " 2584 "loaded as it was last accessed by " 2585 "another system (host: %s hostid: 0x%lx). " 2586 "See: http://illumos.org/msg/ZFS-8000-EY", 2587 spa_name(spa), hostname, 2588 (unsigned long)hostid); 2589 return (SET_ERROR(EBADF)); 2590 } 2591 } 2592 if (nvlist_lookup_nvlist(spa->spa_config, 2593 ZPOOL_REWIND_POLICY, &policy) == 0) 2594 VERIFY(nvlist_add_nvlist(nvconfig, 2595 ZPOOL_REWIND_POLICY, policy) == 0); 2596 2597 spa_config_set(spa, nvconfig); 2598 spa_unload(spa); 2599 spa_deactivate(spa); 2600 spa_activate(spa, orig_mode); 2601 2602 return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE)); 2603 } 2604 2605 /* Grab the secret checksum salt from the MOS. */ 2606 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2607 DMU_POOL_CHECKSUM_SALT, 1, 2608 sizeof (spa->spa_cksum_salt.zcs_bytes), 2609 spa->spa_cksum_salt.zcs_bytes); 2610 if (error == ENOENT) { 2611 /* Generate a new salt for subsequent use */ 2612 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 2613 sizeof (spa->spa_cksum_salt.zcs_bytes)); 2614 } else if (error != 0) { 2615 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2616 } 2617 2618 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0) 2619 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2620 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 2621 if (error != 0) 2622 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2623 2624 /* 2625 * Load the bit that tells us to use the new accounting function 2626 * (raid-z deflation). If we have an older pool, this will not 2627 * be present. 2628 */ 2629 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate); 2630 if (error != 0 && error != ENOENT) 2631 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2632 2633 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 2634 &spa->spa_creation_version); 2635 if (error != 0 && error != ENOENT) 2636 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2637 2638 /* 2639 * Load the persistent error log. If we have an older pool, this will 2640 * not be present. 2641 */ 2642 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last); 2643 if (error != 0 && error != ENOENT) 2644 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2645 2646 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 2647 &spa->spa_errlog_scrub); 2648 if (error != 0 && error != ENOENT) 2649 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2650 2651 /* 2652 * Load the history object. If we have an older pool, this 2653 * will not be present. 2654 */ 2655 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history); 2656 if (error != 0 && error != ENOENT) 2657 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2658 2659 /* 2660 * If we're assembling the pool from the split-off vdevs of 2661 * an existing pool, we don't want to attach the spares & cache 2662 * devices. 2663 */ 2664 2665 /* 2666 * Load any hot spares for this pool. 2667 */ 2668 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object); 2669 if (error != 0 && error != ENOENT) 2670 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2671 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2672 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 2673 if (load_nvlist(spa, spa->spa_spares.sav_object, 2674 &spa->spa_spares.sav_config) != 0) 2675 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2676 2677 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2678 spa_load_spares(spa); 2679 spa_config_exit(spa, SCL_ALL, FTAG); 2680 } else if (error == 0) { 2681 spa->spa_spares.sav_sync = B_TRUE; 2682 } 2683 2684 /* 2685 * Load any level 2 ARC devices for this pool. 2686 */ 2687 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 2688 &spa->spa_l2cache.sav_object); 2689 if (error != 0 && error != ENOENT) 2690 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2691 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2692 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 2693 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 2694 &spa->spa_l2cache.sav_config) != 0) 2695 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2696 2697 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2698 spa_load_l2cache(spa); 2699 spa_config_exit(spa, SCL_ALL, FTAG); 2700 } else if (error == 0) { 2701 spa->spa_l2cache.sav_sync = B_TRUE; 2702 } 2703 2704 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 2705 2706 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object); 2707 if (error && error != ENOENT) 2708 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2709 2710 if (error == 0) { 2711 uint64_t autoreplace; 2712 2713 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 2714 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 2715 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 2716 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 2717 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 2718 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 2719 &spa->spa_dedup_ditto); 2720 2721 spa->spa_autoreplace = (autoreplace != 0); 2722 } 2723 2724 /* 2725 * If the 'autoreplace' property is set, then post a resource notifying 2726 * the ZFS DE that it should not issue any faults for unopenable 2727 * devices. We also iterate over the vdevs, and post a sysevent for any 2728 * unopenable vdevs so that the normal autoreplace handler can take 2729 * over. 2730 */ 2731 if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) { 2732 spa_check_removed(spa->spa_root_vdev); 2733 /* 2734 * For the import case, this is done in spa_import(), because 2735 * at this point we're using the spare definitions from 2736 * the MOS config, not necessarily from the userland config. 2737 */ 2738 if (state != SPA_LOAD_IMPORT) { 2739 spa_aux_check_removed(&spa->spa_spares); 2740 spa_aux_check_removed(&spa->spa_l2cache); 2741 } 2742 } 2743 2744 /* 2745 * Load the vdev state for all toplevel vdevs. 2746 */ 2747 vdev_load(rvd); 2748 2749 /* 2750 * Propagate the leaf DTLs we just loaded all the way up the tree. 2751 */ 2752 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2753 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 2754 spa_config_exit(spa, SCL_ALL, FTAG); 2755 2756 /* 2757 * Load the DDTs (dedup tables). 2758 */ 2759 error = ddt_load(spa); 2760 if (error != 0) 2761 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2762 2763 spa_update_dspace(spa); 2764 2765 /* 2766 * Validate the config, using the MOS config to fill in any 2767 * information which might be missing. If we fail to validate 2768 * the config then declare the pool unfit for use. If we're 2769 * assembling a pool from a split, the log is not transferred 2770 * over. 2771 */ 2772 if (type != SPA_IMPORT_ASSEMBLE) { 2773 nvlist_t *nvconfig; 2774 2775 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2776 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2777 2778 if (!spa_config_valid(spa, nvconfig)) { 2779 nvlist_free(nvconfig); 2780 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2781 ENXIO)); 2782 } 2783 nvlist_free(nvconfig); 2784 2785 /* 2786 * Now that we've validated the config, check the state of the 2787 * root vdev. If it can't be opened, it indicates one or 2788 * more toplevel vdevs are faulted. 2789 */ 2790 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2791 return (SET_ERROR(ENXIO)); 2792 2793 if (spa_writeable(spa) && spa_check_logs(spa)) { 2794 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 2795 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO)); 2796 } 2797 } 2798 2799 if (missing_feat_write) { 2800 ASSERT(state == SPA_LOAD_TRYIMPORT); 2801 2802 /* 2803 * At this point, we know that we can open the pool in 2804 * read-only mode but not read-write mode. We now have enough 2805 * information and can return to userland. 2806 */ 2807 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, ENOTSUP)); 2808 } 2809 2810 /* 2811 * We've successfully opened the pool, verify that we're ready 2812 * to start pushing transactions. 2813 */ 2814 if (state != SPA_LOAD_TRYIMPORT) { 2815 if (error = spa_load_verify(spa)) 2816 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2817 error)); 2818 } 2819 2820 if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER || 2821 spa->spa_load_max_txg == UINT64_MAX)) { 2822 dmu_tx_t *tx; 2823 int need_update = B_FALSE; 2824 dsl_pool_t *dp = spa_get_dsl(spa); 2825 2826 ASSERT(state != SPA_LOAD_TRYIMPORT); 2827 2828 /* 2829 * Claim log blocks that haven't been committed yet. 2830 * This must all happen in a single txg. 2831 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 2832 * invoked from zil_claim_log_block()'s i/o done callback. 2833 * Price of rollback is that we abandon the log. 2834 */ 2835 spa->spa_claiming = B_TRUE; 2836 2837 tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); 2838 (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 2839 zil_claim, tx, DS_FIND_CHILDREN); 2840 dmu_tx_commit(tx); 2841 2842 spa->spa_claiming = B_FALSE; 2843 2844 spa_set_log_state(spa, SPA_LOG_GOOD); 2845 spa->spa_sync_on = B_TRUE; 2846 txg_sync_start(spa->spa_dsl_pool); 2847 2848 /* 2849 * Wait for all claims to sync. We sync up to the highest 2850 * claimed log block birth time so that claimed log blocks 2851 * don't appear to be from the future. spa_claim_max_txg 2852 * will have been set for us by either zil_check_log_chain() 2853 * (invoked from spa_check_logs()) or zil_claim() above. 2854 */ 2855 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 2856 2857 /* 2858 * If the config cache is stale, or we have uninitialized 2859 * metaslabs (see spa_vdev_add()), then update the config. 2860 * 2861 * If this is a verbatim import, trust the current 2862 * in-core spa_config and update the disk labels. 2863 */ 2864 if (config_cache_txg != spa->spa_config_txg || 2865 state == SPA_LOAD_IMPORT || 2866 state == SPA_LOAD_RECOVER || 2867 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 2868 need_update = B_TRUE; 2869 2870 for (int c = 0; c < rvd->vdev_children; c++) 2871 if (rvd->vdev_child[c]->vdev_ms_array == 0) 2872 need_update = B_TRUE; 2873 2874 /* 2875 * Update the config cache asychronously in case we're the 2876 * root pool, in which case the config cache isn't writable yet. 2877 */ 2878 if (need_update) 2879 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2880 2881 /* 2882 * Check all DTLs to see if anything needs resilvering. 2883 */ 2884 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 2885 vdev_resilver_needed(rvd, NULL, NULL)) 2886 spa_async_request(spa, SPA_ASYNC_RESILVER); 2887 2888 /* 2889 * Log the fact that we booted up (so that we can detect if 2890 * we rebooted in the middle of an operation). 2891 */ 2892 spa_history_log_version(spa, "open"); 2893 2894 /* 2895 * Delete any inconsistent datasets. 2896 */ 2897 (void) dmu_objset_find(spa_name(spa), 2898 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 2899 2900 /* 2901 * Clean up any stale temporary dataset userrefs. 2902 */ 2903 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 2904 } 2905 2906 return (0); 2907} 2908 2909static int 2910spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig) 2911{ 2912 int mode = spa->spa_mode; 2913 2914 spa_unload(spa); 2915 spa_deactivate(spa); 2916 2917 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 2918 2919 spa_activate(spa, mode); 2920 spa_async_suspend(spa); 2921 2922 return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig)); 2923} 2924 2925/* 2926 * If spa_load() fails this function will try loading prior txg's. If 2927 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 2928 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 2929 * function will not rewind the pool and will return the same error as 2930 * spa_load(). 2931 */ 2932static int 2933spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig, 2934 uint64_t max_request, int rewind_flags) 2935{ 2936 nvlist_t *loadinfo = NULL; 2937 nvlist_t *config = NULL; 2938 int load_error, rewind_error; 2939 uint64_t safe_rewind_txg; 2940 uint64_t min_txg; 2941 2942 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 2943 spa->spa_load_max_txg = spa->spa_load_txg; 2944 spa_set_log_state(spa, SPA_LOG_CLEAR); 2945 } else { 2946 spa->spa_load_max_txg = max_request; 2947 if (max_request != UINT64_MAX) 2948 spa->spa_extreme_rewind = B_TRUE; 2949 } 2950 2951 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING, 2952 mosconfig); 2953 if (load_error == 0) 2954 return (0); 2955 2956 if (spa->spa_root_vdev != NULL) 2957 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 2958 2959 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 2960 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 2961 2962 if (rewind_flags & ZPOOL_NEVER_REWIND) { 2963 nvlist_free(config); 2964 return (load_error); 2965 } 2966 2967 if (state == SPA_LOAD_RECOVER) { 2968 /* Price of rolling back is discarding txgs, including log */ 2969 spa_set_log_state(spa, SPA_LOG_CLEAR); 2970 } else { 2971 /* 2972 * If we aren't rolling back save the load info from our first 2973 * import attempt so that we can restore it after attempting 2974 * to rewind. 2975 */ 2976 loadinfo = spa->spa_load_info; 2977 spa->spa_load_info = fnvlist_alloc(); 2978 } 2979 2980 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 2981 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 2982 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 2983 TXG_INITIAL : safe_rewind_txg; 2984 2985 /* 2986 * Continue as long as we're finding errors, we're still within 2987 * the acceptable rewind range, and we're still finding uberblocks 2988 */ 2989 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 2990 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 2991 if (spa->spa_load_max_txg < safe_rewind_txg) 2992 spa->spa_extreme_rewind = B_TRUE; 2993 rewind_error = spa_load_retry(spa, state, mosconfig); 2994 } 2995 2996 spa->spa_extreme_rewind = B_FALSE; 2997 spa->spa_load_max_txg = UINT64_MAX; 2998 2999 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 3000 spa_config_set(spa, config); 3001 3002 if (state == SPA_LOAD_RECOVER) { 3003 ASSERT3P(loadinfo, ==, NULL); 3004 return (rewind_error); 3005 } else { 3006 /* Store the rewind info as part of the initial load info */ 3007 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 3008 spa->spa_load_info); 3009 3010 /* Restore the initial load info */ 3011 fnvlist_free(spa->spa_load_info); 3012 spa->spa_load_info = loadinfo; 3013 3014 return (load_error); 3015 } 3016} 3017 3018/* 3019 * Pool Open/Import 3020 * 3021 * The import case is identical to an open except that the configuration is sent 3022 * down from userland, instead of grabbed from the configuration cache. For the 3023 * case of an open, the pool configuration will exist in the 3024 * POOL_STATE_UNINITIALIZED state. 3025 * 3026 * The stats information (gen/count/ustats) is used to gather vdev statistics at 3027 * the same time open the pool, without having to keep around the spa_t in some 3028 * ambiguous state. 3029 */ 3030static int 3031spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 3032 nvlist_t **config) 3033{ 3034 spa_t *spa; 3035 spa_load_state_t state = SPA_LOAD_OPEN; 3036 int error; 3037 int locked = B_FALSE; 3038 int firstopen = B_FALSE; 3039 3040 *spapp = NULL; 3041 3042 /* 3043 * As disgusting as this is, we need to support recursive calls to this 3044 * function because dsl_dir_open() is called during spa_load(), and ends 3045 * up calling spa_open() again. The real fix is to figure out how to 3046 * avoid dsl_dir_open() calling this in the first place. 3047 */ 3048 if (mutex_owner(&spa_namespace_lock) != curthread) { 3049 mutex_enter(&spa_namespace_lock); 3050 locked = B_TRUE; 3051 } 3052 3053 if ((spa = spa_lookup(pool)) == NULL) { 3054 if (locked) 3055 mutex_exit(&spa_namespace_lock); 3056 return (SET_ERROR(ENOENT)); 3057 } 3058 3059 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 3060 zpool_rewind_policy_t policy; 3061 3062 firstopen = B_TRUE; 3063 3064 zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config, 3065 &policy); 3066 if (policy.zrp_request & ZPOOL_DO_REWIND) 3067 state = SPA_LOAD_RECOVER; 3068 3069 spa_activate(spa, spa_mode_global); 3070 3071 if (state != SPA_LOAD_RECOVER) 3072 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 3073 3074 error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg, 3075 policy.zrp_request); 3076 3077 if (error == EBADF) { 3078 /* 3079 * If vdev_validate() returns failure (indicated by 3080 * EBADF), it indicates that one of the vdevs indicates 3081 * that the pool has been exported or destroyed. If 3082 * this is the case, the config cache is out of sync and 3083 * we should remove the pool from the namespace. 3084 */ 3085 spa_unload(spa); 3086 spa_deactivate(spa); 3087 spa_config_sync(spa, B_TRUE, B_TRUE); 3088 spa_remove(spa); 3089 if (locked) 3090 mutex_exit(&spa_namespace_lock); 3091 return (SET_ERROR(ENOENT)); 3092 } 3093 3094 if (error) { 3095 /* 3096 * We can't open the pool, but we still have useful 3097 * information: the state of each vdev after the 3098 * attempted vdev_open(). Return this to the user. 3099 */ 3100 if (config != NULL && spa->spa_config) { 3101 VERIFY(nvlist_dup(spa->spa_config, config, 3102 KM_SLEEP) == 0); 3103 VERIFY(nvlist_add_nvlist(*config, 3104 ZPOOL_CONFIG_LOAD_INFO, 3105 spa->spa_load_info) == 0); 3106 } 3107 spa_unload(spa); 3108 spa_deactivate(spa); 3109 spa->spa_last_open_failed = error; 3110 if (locked) 3111 mutex_exit(&spa_namespace_lock); 3112 *spapp = NULL; 3113 return (error); 3114 } 3115 } 3116 3117 spa_open_ref(spa, tag); 3118 3119 if (config != NULL) 3120 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 3121 3122 /* 3123 * If we've recovered the pool, pass back any information we 3124 * gathered while doing the load. 3125 */ 3126 if (state == SPA_LOAD_RECOVER) { 3127 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 3128 spa->spa_load_info) == 0); 3129 } 3130 3131 if (locked) { 3132 spa->spa_last_open_failed = 0; 3133 spa->spa_last_ubsync_txg = 0; 3134 spa->spa_load_txg = 0; 3135 mutex_exit(&spa_namespace_lock); 3136#ifdef __FreeBSD__ 3137#ifdef _KERNEL 3138 if (firstopen) 3139 zvol_create_minors(spa->spa_name); 3140#endif 3141#endif 3142 } 3143 3144 *spapp = spa; 3145 3146 return (0); 3147} 3148 3149int 3150spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 3151 nvlist_t **config) 3152{ 3153 return (spa_open_common(name, spapp, tag, policy, config)); 3154} 3155 3156int 3157spa_open(const char *name, spa_t **spapp, void *tag) 3158{ 3159 return (spa_open_common(name, spapp, tag, NULL, NULL)); 3160} 3161 3162/* 3163 * Lookup the given spa_t, incrementing the inject count in the process, 3164 * preventing it from being exported or destroyed. 3165 */ 3166spa_t * 3167spa_inject_addref(char *name) 3168{ 3169 spa_t *spa; 3170 3171 mutex_enter(&spa_namespace_lock); 3172 if ((spa = spa_lookup(name)) == NULL) { 3173 mutex_exit(&spa_namespace_lock); 3174 return (NULL); 3175 } 3176 spa->spa_inject_ref++; 3177 mutex_exit(&spa_namespace_lock); 3178 3179 return (spa); 3180} 3181 3182void 3183spa_inject_delref(spa_t *spa) 3184{ 3185 mutex_enter(&spa_namespace_lock); 3186 spa->spa_inject_ref--; 3187 mutex_exit(&spa_namespace_lock); 3188} 3189 3190/* 3191 * Add spares device information to the nvlist. 3192 */ 3193static void 3194spa_add_spares(spa_t *spa, nvlist_t *config) 3195{ 3196 nvlist_t **spares; 3197 uint_t i, nspares; 3198 nvlist_t *nvroot; 3199 uint64_t guid; 3200 vdev_stat_t *vs; 3201 uint_t vsc; 3202 uint64_t pool; 3203 3204 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3205 3206 if (spa->spa_spares.sav_count == 0) 3207 return; 3208 3209 VERIFY(nvlist_lookup_nvlist(config, 3210 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3211 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 3212 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3213 if (nspares != 0) { 3214 VERIFY(nvlist_add_nvlist_array(nvroot, 3215 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3216 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3217 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3218 3219 /* 3220 * Go through and find any spares which have since been 3221 * repurposed as an active spare. If this is the case, update 3222 * their status appropriately. 3223 */ 3224 for (i = 0; i < nspares; i++) { 3225 VERIFY(nvlist_lookup_uint64(spares[i], 3226 ZPOOL_CONFIG_GUID, &guid) == 0); 3227 if (spa_spare_exists(guid, &pool, NULL) && 3228 pool != 0ULL) { 3229 VERIFY(nvlist_lookup_uint64_array( 3230 spares[i], ZPOOL_CONFIG_VDEV_STATS, 3231 (uint64_t **)&vs, &vsc) == 0); 3232 vs->vs_state = VDEV_STATE_CANT_OPEN; 3233 vs->vs_aux = VDEV_AUX_SPARED; 3234 } 3235 } 3236 } 3237} 3238 3239/* 3240 * Add l2cache device information to the nvlist, including vdev stats. 3241 */ 3242static void 3243spa_add_l2cache(spa_t *spa, nvlist_t *config) 3244{ 3245 nvlist_t **l2cache; 3246 uint_t i, j, nl2cache; 3247 nvlist_t *nvroot; 3248 uint64_t guid; 3249 vdev_t *vd; 3250 vdev_stat_t *vs; 3251 uint_t vsc; 3252 3253 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3254 3255 if (spa->spa_l2cache.sav_count == 0) 3256 return; 3257 3258 VERIFY(nvlist_lookup_nvlist(config, 3259 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3260 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 3261 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3262 if (nl2cache != 0) { 3263 VERIFY(nvlist_add_nvlist_array(nvroot, 3264 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3265 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3266 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3267 3268 /* 3269 * Update level 2 cache device stats. 3270 */ 3271 3272 for (i = 0; i < nl2cache; i++) { 3273 VERIFY(nvlist_lookup_uint64(l2cache[i], 3274 ZPOOL_CONFIG_GUID, &guid) == 0); 3275 3276 vd = NULL; 3277 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 3278 if (guid == 3279 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 3280 vd = spa->spa_l2cache.sav_vdevs[j]; 3281 break; 3282 } 3283 } 3284 ASSERT(vd != NULL); 3285 3286 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 3287 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 3288 == 0); 3289 vdev_get_stats(vd, vs); 3290 } 3291 } 3292} 3293 3294static void 3295spa_add_feature_stats(spa_t *spa, nvlist_t *config) 3296{ 3297 nvlist_t *features; 3298 zap_cursor_t zc; 3299 zap_attribute_t za; 3300 3301 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3302 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3303 3304 /* We may be unable to read features if pool is suspended. */ 3305 if (spa_suspended(spa)) 3306 goto out; 3307 3308 if (spa->spa_feat_for_read_obj != 0) { 3309 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3310 spa->spa_feat_for_read_obj); 3311 zap_cursor_retrieve(&zc, &za) == 0; 3312 zap_cursor_advance(&zc)) { 3313 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3314 za.za_num_integers == 1); 3315 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3316 za.za_first_integer)); 3317 } 3318 zap_cursor_fini(&zc); 3319 } 3320 3321 if (spa->spa_feat_for_write_obj != 0) { 3322 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3323 spa->spa_feat_for_write_obj); 3324 zap_cursor_retrieve(&zc, &za) == 0; 3325 zap_cursor_advance(&zc)) { 3326 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3327 za.za_num_integers == 1); 3328 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3329 za.za_first_integer)); 3330 } 3331 zap_cursor_fini(&zc); 3332 } 3333 3334out: 3335 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 3336 features) == 0); 3337 nvlist_free(features); 3338} 3339 3340int 3341spa_get_stats(const char *name, nvlist_t **config, 3342 char *altroot, size_t buflen) 3343{ 3344 int error; 3345 spa_t *spa; 3346 3347 *config = NULL; 3348 error = spa_open_common(name, &spa, FTAG, NULL, config); 3349 3350 if (spa != NULL) { 3351 /* 3352 * This still leaves a window of inconsistency where the spares 3353 * or l2cache devices could change and the config would be 3354 * self-inconsistent. 3355 */ 3356 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 3357 3358 if (*config != NULL) { 3359 uint64_t loadtimes[2]; 3360 3361 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 3362 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 3363 VERIFY(nvlist_add_uint64_array(*config, 3364 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 3365 3366 VERIFY(nvlist_add_uint64(*config, 3367 ZPOOL_CONFIG_ERRCOUNT, 3368 spa_get_errlog_size(spa)) == 0); 3369 3370 if (spa_suspended(spa)) 3371 VERIFY(nvlist_add_uint64(*config, 3372 ZPOOL_CONFIG_SUSPENDED, 3373 spa->spa_failmode) == 0); 3374 3375 spa_add_spares(spa, *config); 3376 spa_add_l2cache(spa, *config); 3377 spa_add_feature_stats(spa, *config); 3378 } 3379 } 3380 3381 /* 3382 * We want to get the alternate root even for faulted pools, so we cheat 3383 * and call spa_lookup() directly. 3384 */ 3385 if (altroot) { 3386 if (spa == NULL) { 3387 mutex_enter(&spa_namespace_lock); 3388 spa = spa_lookup(name); 3389 if (spa) 3390 spa_altroot(spa, altroot, buflen); 3391 else 3392 altroot[0] = '\0'; 3393 spa = NULL; 3394 mutex_exit(&spa_namespace_lock); 3395 } else { 3396 spa_altroot(spa, altroot, buflen); 3397 } 3398 } 3399 3400 if (spa != NULL) { 3401 spa_config_exit(spa, SCL_CONFIG, FTAG); 3402 spa_close(spa, FTAG); 3403 } 3404 3405 return (error); 3406} 3407 3408/* 3409 * Validate that the auxiliary device array is well formed. We must have an 3410 * array of nvlists, each which describes a valid leaf vdev. If this is an 3411 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 3412 * specified, as long as they are well-formed. 3413 */ 3414static int 3415spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 3416 spa_aux_vdev_t *sav, const char *config, uint64_t version, 3417 vdev_labeltype_t label) 3418{ 3419 nvlist_t **dev; 3420 uint_t i, ndev; 3421 vdev_t *vd; 3422 int error; 3423 3424 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3425 3426 /* 3427 * It's acceptable to have no devs specified. 3428 */ 3429 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 3430 return (0); 3431 3432 if (ndev == 0) 3433 return (SET_ERROR(EINVAL)); 3434 3435 /* 3436 * Make sure the pool is formatted with a version that supports this 3437 * device type. 3438 */ 3439 if (spa_version(spa) < version) 3440 return (SET_ERROR(ENOTSUP)); 3441 3442 /* 3443 * Set the pending device list so we correctly handle device in-use 3444 * checking. 3445 */ 3446 sav->sav_pending = dev; 3447 sav->sav_npending = ndev; 3448 3449 for (i = 0; i < ndev; i++) { 3450 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 3451 mode)) != 0) 3452 goto out; 3453 3454 if (!vd->vdev_ops->vdev_op_leaf) { 3455 vdev_free(vd); 3456 error = SET_ERROR(EINVAL); 3457 goto out; 3458 } 3459 3460 /* 3461 * The L2ARC currently only supports disk devices in 3462 * kernel context. For user-level testing, we allow it. 3463 */ 3464#ifdef _KERNEL 3465 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 3466 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 3467 error = SET_ERROR(ENOTBLK); 3468 vdev_free(vd); 3469 goto out; 3470 } 3471#endif 3472 vd->vdev_top = vd; 3473 3474 if ((error = vdev_open(vd)) == 0 && 3475 (error = vdev_label_init(vd, crtxg, label)) == 0) { 3476 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 3477 vd->vdev_guid) == 0); 3478 } 3479 3480 vdev_free(vd); 3481 3482 if (error && 3483 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 3484 goto out; 3485 else 3486 error = 0; 3487 } 3488 3489out: 3490 sav->sav_pending = NULL; 3491 sav->sav_npending = 0; 3492 return (error); 3493} 3494 3495static int 3496spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 3497{ 3498 int error; 3499 3500 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3501 3502 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3503 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 3504 VDEV_LABEL_SPARE)) != 0) { 3505 return (error); 3506 } 3507 3508 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3509 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 3510 VDEV_LABEL_L2CACHE)); 3511} 3512 3513static void 3514spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 3515 const char *config) 3516{ 3517 int i; 3518 3519 if (sav->sav_config != NULL) { 3520 nvlist_t **olddevs; 3521 uint_t oldndevs; 3522 nvlist_t **newdevs; 3523 3524 /* 3525 * Generate new dev list by concatentating with the 3526 * current dev list. 3527 */ 3528 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 3529 &olddevs, &oldndevs) == 0); 3530 3531 newdevs = kmem_alloc(sizeof (void *) * 3532 (ndevs + oldndevs), KM_SLEEP); 3533 for (i = 0; i < oldndevs; i++) 3534 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 3535 KM_SLEEP) == 0); 3536 for (i = 0; i < ndevs; i++) 3537 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 3538 KM_SLEEP) == 0); 3539 3540 VERIFY(nvlist_remove(sav->sav_config, config, 3541 DATA_TYPE_NVLIST_ARRAY) == 0); 3542 3543 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 3544 config, newdevs, ndevs + oldndevs) == 0); 3545 for (i = 0; i < oldndevs + ndevs; i++) 3546 nvlist_free(newdevs[i]); 3547 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 3548 } else { 3549 /* 3550 * Generate a new dev list. 3551 */ 3552 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 3553 KM_SLEEP) == 0); 3554 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 3555 devs, ndevs) == 0); 3556 } 3557} 3558 3559/* 3560 * Stop and drop level 2 ARC devices 3561 */ 3562void 3563spa_l2cache_drop(spa_t *spa) 3564{ 3565 vdev_t *vd; 3566 int i; 3567 spa_aux_vdev_t *sav = &spa->spa_l2cache; 3568 3569 for (i = 0; i < sav->sav_count; i++) { 3570 uint64_t pool; 3571 3572 vd = sav->sav_vdevs[i]; 3573 ASSERT(vd != NULL); 3574 3575 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 3576 pool != 0ULL && l2arc_vdev_present(vd)) 3577 l2arc_remove_vdev(vd); 3578 } 3579} 3580 3581/* 3582 * Pool Creation 3583 */ 3584int 3585spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 3586 nvlist_t *zplprops) 3587{ 3588 spa_t *spa; 3589 char *altroot = NULL; 3590 vdev_t *rvd; 3591 dsl_pool_t *dp; 3592 dmu_tx_t *tx; 3593 int error = 0; 3594 uint64_t txg = TXG_INITIAL; 3595 nvlist_t **spares, **l2cache; 3596 uint_t nspares, nl2cache; 3597 uint64_t version, obj; 3598 boolean_t has_features; 3599 3600 /* 3601 * If this pool already exists, return failure. 3602 */ 3603 mutex_enter(&spa_namespace_lock); 3604 if (spa_lookup(pool) != NULL) { 3605 mutex_exit(&spa_namespace_lock); 3606 return (SET_ERROR(EEXIST)); 3607 } 3608 3609 /* 3610 * Allocate a new spa_t structure. 3611 */ 3612 (void) nvlist_lookup_string(props, 3613 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 3614 spa = spa_add(pool, NULL, altroot); 3615 spa_activate(spa, spa_mode_global); 3616 3617 if (props && (error = spa_prop_validate(spa, props))) { 3618 spa_deactivate(spa); 3619 spa_remove(spa); 3620 mutex_exit(&spa_namespace_lock); 3621 return (error); 3622 } 3623 3624 has_features = B_FALSE; 3625 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 3626 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 3627 if (zpool_prop_feature(nvpair_name(elem))) 3628 has_features = B_TRUE; 3629 } 3630 3631 if (has_features || nvlist_lookup_uint64(props, 3632 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 3633 version = SPA_VERSION; 3634 } 3635 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 3636 3637 spa->spa_first_txg = txg; 3638 spa->spa_uberblock.ub_txg = txg - 1; 3639 spa->spa_uberblock.ub_version = version; 3640 spa->spa_ubsync = spa->spa_uberblock; 3641 3642 /* 3643 * Create "The Godfather" zio to hold all async IOs 3644 */ 3645 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 3646 KM_SLEEP); 3647 for (int i = 0; i < max_ncpus; i++) { 3648 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 3649 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 3650 ZIO_FLAG_GODFATHER); 3651 } 3652 3653 /* 3654 * Create the root vdev. 3655 */ 3656 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3657 3658 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 3659 3660 ASSERT(error != 0 || rvd != NULL); 3661 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 3662 3663 if (error == 0 && !zfs_allocatable_devs(nvroot)) 3664 error = SET_ERROR(EINVAL); 3665 3666 if (error == 0 && 3667 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 3668 (error = spa_validate_aux(spa, nvroot, txg, 3669 VDEV_ALLOC_ADD)) == 0) { 3670 for (int c = 0; c < rvd->vdev_children; c++) { 3671 vdev_ashift_optimize(rvd->vdev_child[c]); 3672 vdev_metaslab_set_size(rvd->vdev_child[c]); 3673 vdev_expand(rvd->vdev_child[c], txg); 3674 } 3675 } 3676 3677 spa_config_exit(spa, SCL_ALL, FTAG); 3678 3679 if (error != 0) { 3680 spa_unload(spa); 3681 spa_deactivate(spa); 3682 spa_remove(spa); 3683 mutex_exit(&spa_namespace_lock); 3684 return (error); 3685 } 3686 3687 /* 3688 * Get the list of spares, if specified. 3689 */ 3690 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 3691 &spares, &nspares) == 0) { 3692 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 3693 KM_SLEEP) == 0); 3694 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 3695 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3696 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3697 spa_load_spares(spa); 3698 spa_config_exit(spa, SCL_ALL, FTAG); 3699 spa->spa_spares.sav_sync = B_TRUE; 3700 } 3701 3702 /* 3703 * Get the list of level 2 cache devices, if specified. 3704 */ 3705 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 3706 &l2cache, &nl2cache) == 0) { 3707 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 3708 NV_UNIQUE_NAME, KM_SLEEP) == 0); 3709 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 3710 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3711 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3712 spa_load_l2cache(spa); 3713 spa_config_exit(spa, SCL_ALL, FTAG); 3714 spa->spa_l2cache.sav_sync = B_TRUE; 3715 } 3716 3717 spa->spa_is_initializing = B_TRUE; 3718 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 3719 spa->spa_meta_objset = dp->dp_meta_objset; 3720 spa->spa_is_initializing = B_FALSE; 3721 3722 /* 3723 * Create DDTs (dedup tables). 3724 */ 3725 ddt_create(spa); 3726 3727 spa_update_dspace(spa); 3728 3729 tx = dmu_tx_create_assigned(dp, txg); 3730 3731 /* 3732 * Create the pool config object. 3733 */ 3734 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 3735 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 3736 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 3737 3738 if (zap_add(spa->spa_meta_objset, 3739 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 3740 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 3741 cmn_err(CE_PANIC, "failed to add pool config"); 3742 } 3743 3744 if (spa_version(spa) >= SPA_VERSION_FEATURES) 3745 spa_feature_create_zap_objects(spa, tx); 3746 3747 if (zap_add(spa->spa_meta_objset, 3748 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 3749 sizeof (uint64_t), 1, &version, tx) != 0) { 3750 cmn_err(CE_PANIC, "failed to add pool version"); 3751 } 3752 3753 /* Newly created pools with the right version are always deflated. */ 3754 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 3755 spa->spa_deflate = TRUE; 3756 if (zap_add(spa->spa_meta_objset, 3757 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 3758 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 3759 cmn_err(CE_PANIC, "failed to add deflate"); 3760 } 3761 } 3762 3763 /* 3764 * Create the deferred-free bpobj. Turn off compression 3765 * because sync-to-convergence takes longer if the blocksize 3766 * keeps changing. 3767 */ 3768 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 3769 dmu_object_set_compress(spa->spa_meta_objset, obj, 3770 ZIO_COMPRESS_OFF, tx); 3771 if (zap_add(spa->spa_meta_objset, 3772 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 3773 sizeof (uint64_t), 1, &obj, tx) != 0) { 3774 cmn_err(CE_PANIC, "failed to add bpobj"); 3775 } 3776 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 3777 spa->spa_meta_objset, obj)); 3778 3779 /* 3780 * Create the pool's history object. 3781 */ 3782 if (version >= SPA_VERSION_ZPOOL_HISTORY) 3783 spa_history_create_obj(spa, tx); 3784 3785 /* 3786 * Generate some random noise for salted checksums to operate on. 3787 */ 3788 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 3789 sizeof (spa->spa_cksum_salt.zcs_bytes)); 3790 3791 /* 3792 * Set pool properties. 3793 */ 3794 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 3795 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3796 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 3797 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 3798 3799 if (props != NULL) { 3800 spa_configfile_set(spa, props, B_FALSE); 3801 spa_sync_props(props, tx); 3802 } 3803 3804 dmu_tx_commit(tx); 3805 3806 spa->spa_sync_on = B_TRUE; 3807 txg_sync_start(spa->spa_dsl_pool); 3808 3809 /* 3810 * We explicitly wait for the first transaction to complete so that our 3811 * bean counters are appropriately updated. 3812 */ 3813 txg_wait_synced(spa->spa_dsl_pool, txg); 3814 3815 spa_config_sync(spa, B_FALSE, B_TRUE); 3816 spa_event_notify(spa, NULL, ESC_ZFS_POOL_CREATE); 3817 3818 spa_history_log_version(spa, "create"); 3819 3820 /* 3821 * Don't count references from objsets that are already closed 3822 * and are making their way through the eviction process. 3823 */ 3824 spa_evicting_os_wait(spa); 3825 spa->spa_minref = refcount_count(&spa->spa_refcount); 3826 3827 mutex_exit(&spa_namespace_lock); 3828 3829 return (0); 3830} 3831 3832#ifdef _KERNEL 3833#ifdef illumos 3834/* 3835 * Get the root pool information from the root disk, then import the root pool 3836 * during the system boot up time. 3837 */ 3838extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 3839 3840static nvlist_t * 3841spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 3842{ 3843 nvlist_t *config; 3844 nvlist_t *nvtop, *nvroot; 3845 uint64_t pgid; 3846 3847 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 3848 return (NULL); 3849 3850 /* 3851 * Add this top-level vdev to the child array. 3852 */ 3853 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3854 &nvtop) == 0); 3855 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 3856 &pgid) == 0); 3857 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 3858 3859 /* 3860 * Put this pool's top-level vdevs into a root vdev. 3861 */ 3862 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3863 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 3864 VDEV_TYPE_ROOT) == 0); 3865 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 3866 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 3867 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 3868 &nvtop, 1) == 0); 3869 3870 /* 3871 * Replace the existing vdev_tree with the new root vdev in 3872 * this pool's configuration (remove the old, add the new). 3873 */ 3874 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 3875 nvlist_free(nvroot); 3876 return (config); 3877} 3878 3879/* 3880 * Walk the vdev tree and see if we can find a device with "better" 3881 * configuration. A configuration is "better" if the label on that 3882 * device has a more recent txg. 3883 */ 3884static void 3885spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 3886{ 3887 for (int c = 0; c < vd->vdev_children; c++) 3888 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 3889 3890 if (vd->vdev_ops->vdev_op_leaf) { 3891 nvlist_t *label; 3892 uint64_t label_txg; 3893 3894 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 3895 &label) != 0) 3896 return; 3897 3898 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 3899 &label_txg) == 0); 3900 3901 /* 3902 * Do we have a better boot device? 3903 */ 3904 if (label_txg > *txg) { 3905 *txg = label_txg; 3906 *avd = vd; 3907 } 3908 nvlist_free(label); 3909 } 3910} 3911 3912/* 3913 * Import a root pool. 3914 * 3915 * For x86. devpath_list will consist of devid and/or physpath name of 3916 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 3917 * The GRUB "findroot" command will return the vdev we should boot. 3918 * 3919 * For Sparc, devpath_list consists the physpath name of the booting device 3920 * no matter the rootpool is a single device pool or a mirrored pool. 3921 * e.g. 3922 * "/pci@1f,0/ide@d/disk@0,0:a" 3923 */ 3924int 3925spa_import_rootpool(char *devpath, char *devid) 3926{ 3927 spa_t *spa; 3928 vdev_t *rvd, *bvd, *avd = NULL; 3929 nvlist_t *config, *nvtop; 3930 uint64_t guid, txg; 3931 char *pname; 3932 int error; 3933 3934 /* 3935 * Read the label from the boot device and generate a configuration. 3936 */ 3937 config = spa_generate_rootconf(devpath, devid, &guid); 3938#if defined(_OBP) && defined(_KERNEL) 3939 if (config == NULL) { 3940 if (strstr(devpath, "/iscsi/ssd") != NULL) { 3941 /* iscsi boot */ 3942 get_iscsi_bootpath_phy(devpath); 3943 config = spa_generate_rootconf(devpath, devid, &guid); 3944 } 3945 } 3946#endif 3947 if (config == NULL) { 3948 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 3949 devpath); 3950 return (SET_ERROR(EIO)); 3951 } 3952 3953 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 3954 &pname) == 0); 3955 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 3956 3957 mutex_enter(&spa_namespace_lock); 3958 if ((spa = spa_lookup(pname)) != NULL) { 3959 /* 3960 * Remove the existing root pool from the namespace so that we 3961 * can replace it with the correct config we just read in. 3962 */ 3963 spa_remove(spa); 3964 } 3965 3966 spa = spa_add(pname, config, NULL); 3967 spa->spa_is_root = B_TRUE; 3968 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 3969 3970 /* 3971 * Build up a vdev tree based on the boot device's label config. 3972 */ 3973 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3974 &nvtop) == 0); 3975 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3976 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 3977 VDEV_ALLOC_ROOTPOOL); 3978 spa_config_exit(spa, SCL_ALL, FTAG); 3979 if (error) { 3980 mutex_exit(&spa_namespace_lock); 3981 nvlist_free(config); 3982 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 3983 pname); 3984 return (error); 3985 } 3986 3987 /* 3988 * Get the boot vdev. 3989 */ 3990 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 3991 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 3992 (u_longlong_t)guid); 3993 error = SET_ERROR(ENOENT); 3994 goto out; 3995 } 3996 3997 /* 3998 * Determine if there is a better boot device. 3999 */ 4000 avd = bvd; 4001 spa_alt_rootvdev(rvd, &avd, &txg); 4002 if (avd != bvd) { 4003 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 4004 "try booting from '%s'", avd->vdev_path); 4005 error = SET_ERROR(EINVAL); 4006 goto out; 4007 } 4008 4009 /* 4010 * If the boot device is part of a spare vdev then ensure that 4011 * we're booting off the active spare. 4012 */ 4013 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 4014 !bvd->vdev_isspare) { 4015 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 4016 "try booting from '%s'", 4017 bvd->vdev_parent-> 4018 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 4019 error = SET_ERROR(EINVAL); 4020 goto out; 4021 } 4022 4023 error = 0; 4024out: 4025 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4026 vdev_free(rvd); 4027 spa_config_exit(spa, SCL_ALL, FTAG); 4028 mutex_exit(&spa_namespace_lock); 4029 4030 nvlist_free(config); 4031 return (error); 4032} 4033 4034#else /* !illumos */ 4035 4036extern int vdev_geom_read_pool_label(const char *name, nvlist_t ***configs, 4037 uint64_t *count); 4038 4039static nvlist_t * 4040spa_generate_rootconf(const char *name) 4041{ 4042 nvlist_t **configs, **tops; 4043 nvlist_t *config; 4044 nvlist_t *best_cfg, *nvtop, *nvroot; 4045 uint64_t *holes; 4046 uint64_t best_txg; 4047 uint64_t nchildren; 4048 uint64_t pgid; 4049 uint64_t count; 4050 uint64_t i; 4051 uint_t nholes; 4052 4053 if (vdev_geom_read_pool_label(name, &configs, &count) != 0) 4054 return (NULL); 4055 4056 ASSERT3U(count, !=, 0); 4057 best_txg = 0; 4058 for (i = 0; i < count; i++) { 4059 uint64_t txg; 4060 4061 VERIFY(nvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG, 4062 &txg) == 0); 4063 if (txg > best_txg) { 4064 best_txg = txg; 4065 best_cfg = configs[i]; 4066 } 4067 } 4068 4069 /* 4070 * Multi-vdev root pool configuration discovery is not supported yet. 4071 */ 4072 nchildren = 1; 4073 nvlist_lookup_uint64(best_cfg, ZPOOL_CONFIG_VDEV_CHILDREN, &nchildren); 4074 holes = NULL; 4075 nvlist_lookup_uint64_array(best_cfg, ZPOOL_CONFIG_HOLE_ARRAY, 4076 &holes, &nholes); 4077 4078 tops = kmem_zalloc(nchildren * sizeof(void *), KM_SLEEP); 4079 for (i = 0; i < nchildren; i++) { 4080 if (i >= count) 4081 break; 4082 if (configs[i] == NULL) 4083 continue; 4084 VERIFY(nvlist_lookup_nvlist(configs[i], ZPOOL_CONFIG_VDEV_TREE, 4085 &nvtop) == 0); 4086 nvlist_dup(nvtop, &tops[i], KM_SLEEP); 4087 } 4088 for (i = 0; holes != NULL && i < nholes; i++) { 4089 if (i >= nchildren) 4090 continue; 4091 if (tops[holes[i]] != NULL) 4092 continue; 4093 nvlist_alloc(&tops[holes[i]], NV_UNIQUE_NAME, KM_SLEEP); 4094 VERIFY(nvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE, 4095 VDEV_TYPE_HOLE) == 0); 4096 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID, 4097 holes[i]) == 0); 4098 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID, 4099 0) == 0); 4100 } 4101 for (i = 0; i < nchildren; i++) { 4102 if (tops[i] != NULL) 4103 continue; 4104 nvlist_alloc(&tops[i], NV_UNIQUE_NAME, KM_SLEEP); 4105 VERIFY(nvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE, 4106 VDEV_TYPE_MISSING) == 0); 4107 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID, 4108 i) == 0); 4109 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID, 4110 0) == 0); 4111 } 4112 4113 /* 4114 * Create pool config based on the best vdev config. 4115 */ 4116 nvlist_dup(best_cfg, &config, KM_SLEEP); 4117 4118 /* 4119 * Put this pool's top-level vdevs into a root vdev. 4120 */ 4121 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 4122 &pgid) == 0); 4123 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4124 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 4125 VDEV_TYPE_ROOT) == 0); 4126 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 4127 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 4128 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 4129 tops, nchildren) == 0); 4130 4131 /* 4132 * Replace the existing vdev_tree with the new root vdev in 4133 * this pool's configuration (remove the old, add the new). 4134 */ 4135 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 4136 4137 /* 4138 * Drop vdev config elements that should not be present at pool level. 4139 */ 4140 nvlist_remove(config, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64); 4141 nvlist_remove(config, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64); 4142 4143 for (i = 0; i < count; i++) 4144 nvlist_free(configs[i]); 4145 kmem_free(configs, count * sizeof(void *)); 4146 for (i = 0; i < nchildren; i++) 4147 nvlist_free(tops[i]); 4148 kmem_free(tops, nchildren * sizeof(void *)); 4149 nvlist_free(nvroot); 4150 return (config); 4151} 4152 4153int 4154spa_import_rootpool(const char *name) 4155{ 4156 spa_t *spa; 4157 vdev_t *rvd, *bvd, *avd = NULL; 4158 nvlist_t *config, *nvtop; 4159 uint64_t txg; 4160 char *pname; 4161 int error; 4162 4163 /* 4164 * Read the label from the boot device and generate a configuration. 4165 */ 4166 config = spa_generate_rootconf(name); 4167 4168 mutex_enter(&spa_namespace_lock); 4169 if (config != NULL) { 4170 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 4171 &pname) == 0 && strcmp(name, pname) == 0); 4172 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) 4173 == 0); 4174 4175 if ((spa = spa_lookup(pname)) != NULL) { 4176 /* 4177 * Remove the existing root pool from the namespace so 4178 * that we can replace it with the correct config 4179 * we just read in. 4180 */ 4181 spa_remove(spa); 4182 } 4183 spa = spa_add(pname, config, NULL); 4184 4185 /* 4186 * Set spa_ubsync.ub_version as it can be used in vdev_alloc() 4187 * via spa_version(). 4188 */ 4189 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 4190 &spa->spa_ubsync.ub_version) != 0) 4191 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 4192 } else if ((spa = spa_lookup(name)) == NULL) { 4193 mutex_exit(&spa_namespace_lock); 4194 nvlist_free(config); 4195 cmn_err(CE_NOTE, "Cannot find the pool label for '%s'", 4196 name); 4197 return (EIO); 4198 } else { 4199 VERIFY(nvlist_dup(spa->spa_config, &config, KM_SLEEP) == 0); 4200 } 4201 spa->spa_is_root = B_TRUE; 4202 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 4203 4204 /* 4205 * Build up a vdev tree based on the boot device's label config. 4206 */ 4207 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4208 &nvtop) == 0); 4209 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4210 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 4211 VDEV_ALLOC_ROOTPOOL); 4212 spa_config_exit(spa, SCL_ALL, FTAG); 4213 if (error) { 4214 mutex_exit(&spa_namespace_lock); 4215 nvlist_free(config); 4216 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 4217 pname); 4218 return (error); 4219 } 4220 4221 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4222 vdev_free(rvd); 4223 spa_config_exit(spa, SCL_ALL, FTAG); 4224 mutex_exit(&spa_namespace_lock); 4225 4226 nvlist_free(config); 4227 return (0); 4228} 4229 4230#endif /* illumos */ 4231#endif /* _KERNEL */ 4232 4233/* 4234 * Import a non-root pool into the system. 4235 */ 4236int 4237spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 4238{ 4239 spa_t *spa; 4240 char *altroot = NULL; 4241 spa_load_state_t state = SPA_LOAD_IMPORT; 4242 zpool_rewind_policy_t policy; 4243 uint64_t mode = spa_mode_global; 4244 uint64_t readonly = B_FALSE; 4245 int error; 4246 nvlist_t *nvroot; 4247 nvlist_t **spares, **l2cache; 4248 uint_t nspares, nl2cache; 4249 4250 /* 4251 * If a pool with this name exists, return failure. 4252 */ 4253 mutex_enter(&spa_namespace_lock); 4254 if (spa_lookup(pool) != NULL) { 4255 mutex_exit(&spa_namespace_lock); 4256 return (SET_ERROR(EEXIST)); 4257 } 4258 4259 /* 4260 * Create and initialize the spa structure. 4261 */ 4262 (void) nvlist_lookup_string(props, 4263 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4264 (void) nvlist_lookup_uint64(props, 4265 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 4266 if (readonly) 4267 mode = FREAD; 4268 spa = spa_add(pool, config, altroot); 4269 spa->spa_import_flags = flags; 4270 4271 /* 4272 * Verbatim import - Take a pool and insert it into the namespace 4273 * as if it had been loaded at boot. 4274 */ 4275 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 4276 if (props != NULL) 4277 spa_configfile_set(spa, props, B_FALSE); 4278 4279 spa_config_sync(spa, B_FALSE, B_TRUE); 4280 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4281 4282 mutex_exit(&spa_namespace_lock); 4283 return (0); 4284 } 4285 4286 spa_activate(spa, mode); 4287 4288 /* 4289 * Don't start async tasks until we know everything is healthy. 4290 */ 4291 spa_async_suspend(spa); 4292 4293 zpool_get_rewind_policy(config, &policy); 4294 if (policy.zrp_request & ZPOOL_DO_REWIND) 4295 state = SPA_LOAD_RECOVER; 4296 4297 /* 4298 * Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig 4299 * because the user-supplied config is actually the one to trust when 4300 * doing an import. 4301 */ 4302 if (state != SPA_LOAD_RECOVER) 4303 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4304 4305 error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg, 4306 policy.zrp_request); 4307 4308 /* 4309 * Propagate anything learned while loading the pool and pass it 4310 * back to caller (i.e. rewind info, missing devices, etc). 4311 */ 4312 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4313 spa->spa_load_info) == 0); 4314 4315 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4316 /* 4317 * Toss any existing sparelist, as it doesn't have any validity 4318 * anymore, and conflicts with spa_has_spare(). 4319 */ 4320 if (spa->spa_spares.sav_config) { 4321 nvlist_free(spa->spa_spares.sav_config); 4322 spa->spa_spares.sav_config = NULL; 4323 spa_load_spares(spa); 4324 } 4325 if (spa->spa_l2cache.sav_config) { 4326 nvlist_free(spa->spa_l2cache.sav_config); 4327 spa->spa_l2cache.sav_config = NULL; 4328 spa_load_l2cache(spa); 4329 } 4330 4331 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4332 &nvroot) == 0); 4333 if (error == 0) 4334 error = spa_validate_aux(spa, nvroot, -1ULL, 4335 VDEV_ALLOC_SPARE); 4336 if (error == 0) 4337 error = spa_validate_aux(spa, nvroot, -1ULL, 4338 VDEV_ALLOC_L2CACHE); 4339 spa_config_exit(spa, SCL_ALL, FTAG); 4340 4341 if (props != NULL) 4342 spa_configfile_set(spa, props, B_FALSE); 4343 4344 if (error != 0 || (props && spa_writeable(spa) && 4345 (error = spa_prop_set(spa, props)))) { 4346 spa_unload(spa); 4347 spa_deactivate(spa); 4348 spa_remove(spa); 4349 mutex_exit(&spa_namespace_lock); 4350 return (error); 4351 } 4352 4353 spa_async_resume(spa); 4354 4355 /* 4356 * Override any spares and level 2 cache devices as specified by 4357 * the user, as these may have correct device names/devids, etc. 4358 */ 4359 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4360 &spares, &nspares) == 0) { 4361 if (spa->spa_spares.sav_config) 4362 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 4363 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 4364 else 4365 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 4366 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4367 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4368 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4369 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4370 spa_load_spares(spa); 4371 spa_config_exit(spa, SCL_ALL, FTAG); 4372 spa->spa_spares.sav_sync = B_TRUE; 4373 } 4374 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4375 &l2cache, &nl2cache) == 0) { 4376 if (spa->spa_l2cache.sav_config) 4377 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 4378 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 4379 else 4380 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4381 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4382 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4383 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4384 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4385 spa_load_l2cache(spa); 4386 spa_config_exit(spa, SCL_ALL, FTAG); 4387 spa->spa_l2cache.sav_sync = B_TRUE; 4388 } 4389 4390 /* 4391 * Check for any removed devices. 4392 */ 4393 if (spa->spa_autoreplace) { 4394 spa_aux_check_removed(&spa->spa_spares); 4395 spa_aux_check_removed(&spa->spa_l2cache); 4396 } 4397 4398 if (spa_writeable(spa)) { 4399 /* 4400 * Update the config cache to include the newly-imported pool. 4401 */ 4402 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4403 } 4404 4405 /* 4406 * It's possible that the pool was expanded while it was exported. 4407 * We kick off an async task to handle this for us. 4408 */ 4409 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 4410 4411 spa_history_log_version(spa, "import"); 4412 4413 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4414 4415 mutex_exit(&spa_namespace_lock); 4416 4417#ifdef __FreeBSD__ 4418#ifdef _KERNEL 4419 zvol_create_minors(pool); 4420#endif 4421#endif 4422 return (0); 4423} 4424 4425nvlist_t * 4426spa_tryimport(nvlist_t *tryconfig) 4427{ 4428 nvlist_t *config = NULL; 4429 char *poolname; 4430 spa_t *spa; 4431 uint64_t state; 4432 int error; 4433 4434 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 4435 return (NULL); 4436 4437 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 4438 return (NULL); 4439 4440 /* 4441 * Create and initialize the spa structure. 4442 */ 4443 mutex_enter(&spa_namespace_lock); 4444 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 4445 spa_activate(spa, FREAD); 4446 4447 /* 4448 * Pass off the heavy lifting to spa_load(). 4449 * Pass TRUE for mosconfig because the user-supplied config 4450 * is actually the one to trust when doing an import. 4451 */ 4452 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE); 4453 4454 /* 4455 * If 'tryconfig' was at least parsable, return the current config. 4456 */ 4457 if (spa->spa_root_vdev != NULL) { 4458 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4459 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 4460 poolname) == 0); 4461 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 4462 state) == 0); 4463 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 4464 spa->spa_uberblock.ub_timestamp) == 0); 4465 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4466 spa->spa_load_info) == 0); 4467 4468 /* 4469 * If the bootfs property exists on this pool then we 4470 * copy it out so that external consumers can tell which 4471 * pools are bootable. 4472 */ 4473 if ((!error || error == EEXIST) && spa->spa_bootfs) { 4474 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4475 4476 /* 4477 * We have to play games with the name since the 4478 * pool was opened as TRYIMPORT_NAME. 4479 */ 4480 if (dsl_dsobj_to_dsname(spa_name(spa), 4481 spa->spa_bootfs, tmpname) == 0) { 4482 char *cp; 4483 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4484 4485 cp = strchr(tmpname, '/'); 4486 if (cp == NULL) { 4487 (void) strlcpy(dsname, tmpname, 4488 MAXPATHLEN); 4489 } else { 4490 (void) snprintf(dsname, MAXPATHLEN, 4491 "%s/%s", poolname, ++cp); 4492 } 4493 VERIFY(nvlist_add_string(config, 4494 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 4495 kmem_free(dsname, MAXPATHLEN); 4496 } 4497 kmem_free(tmpname, MAXPATHLEN); 4498 } 4499 4500 /* 4501 * Add the list of hot spares and level 2 cache devices. 4502 */ 4503 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4504 spa_add_spares(spa, config); 4505 spa_add_l2cache(spa, config); 4506 spa_config_exit(spa, SCL_CONFIG, FTAG); 4507 } 4508 4509 spa_unload(spa); 4510 spa_deactivate(spa); 4511 spa_remove(spa); 4512 mutex_exit(&spa_namespace_lock); 4513 4514 return (config); 4515} 4516 4517/* 4518 * Pool export/destroy 4519 * 4520 * The act of destroying or exporting a pool is very simple. We make sure there 4521 * is no more pending I/O and any references to the pool are gone. Then, we 4522 * update the pool state and sync all the labels to disk, removing the 4523 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 4524 * we don't sync the labels or remove the configuration cache. 4525 */ 4526static int 4527spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 4528 boolean_t force, boolean_t hardforce) 4529{ 4530 spa_t *spa; 4531 4532 if (oldconfig) 4533 *oldconfig = NULL; 4534 4535 if (!(spa_mode_global & FWRITE)) 4536 return (SET_ERROR(EROFS)); 4537 4538 mutex_enter(&spa_namespace_lock); 4539 if ((spa = spa_lookup(pool)) == NULL) { 4540 mutex_exit(&spa_namespace_lock); 4541 return (SET_ERROR(ENOENT)); 4542 } 4543 4544 /* 4545 * Put a hold on the pool, drop the namespace lock, stop async tasks, 4546 * reacquire the namespace lock, and see if we can export. 4547 */ 4548 spa_open_ref(spa, FTAG); 4549 mutex_exit(&spa_namespace_lock); 4550 spa_async_suspend(spa); 4551 mutex_enter(&spa_namespace_lock); 4552 spa_close(spa, FTAG); 4553 4554 /* 4555 * The pool will be in core if it's openable, 4556 * in which case we can modify its state. 4557 */ 4558 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 4559 /* 4560 * Objsets may be open only because they're dirty, so we 4561 * have to force it to sync before checking spa_refcnt. 4562 */ 4563 txg_wait_synced(spa->spa_dsl_pool, 0); 4564 spa_evicting_os_wait(spa); 4565 4566 /* 4567 * A pool cannot be exported or destroyed if there are active 4568 * references. If we are resetting a pool, allow references by 4569 * fault injection handlers. 4570 */ 4571 if (!spa_refcount_zero(spa) || 4572 (spa->spa_inject_ref != 0 && 4573 new_state != POOL_STATE_UNINITIALIZED)) { 4574 spa_async_resume(spa); 4575 mutex_exit(&spa_namespace_lock); 4576 return (SET_ERROR(EBUSY)); 4577 } 4578 4579 /* 4580 * A pool cannot be exported if it has an active shared spare. 4581 * This is to prevent other pools stealing the active spare 4582 * from an exported pool. At user's own will, such pool can 4583 * be forcedly exported. 4584 */ 4585 if (!force && new_state == POOL_STATE_EXPORTED && 4586 spa_has_active_shared_spare(spa)) { 4587 spa_async_resume(spa); 4588 mutex_exit(&spa_namespace_lock); 4589 return (SET_ERROR(EXDEV)); 4590 } 4591 4592 /* 4593 * We want this to be reflected on every label, 4594 * so mark them all dirty. spa_unload() will do the 4595 * final sync that pushes these changes out. 4596 */ 4597 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 4598 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4599 spa->spa_state = new_state; 4600 spa->spa_final_txg = spa_last_synced_txg(spa) + 4601 TXG_DEFER_SIZE + 1; 4602 vdev_config_dirty(spa->spa_root_vdev); 4603 spa_config_exit(spa, SCL_ALL, FTAG); 4604 } 4605 } 4606 4607 spa_event_notify(spa, NULL, ESC_ZFS_POOL_DESTROY); 4608 4609 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 4610 spa_unload(spa); 4611 spa_deactivate(spa); 4612 } 4613 4614 if (oldconfig && spa->spa_config) 4615 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 4616 4617 if (new_state != POOL_STATE_UNINITIALIZED) { 4618 if (!hardforce) 4619 spa_config_sync(spa, B_TRUE, B_TRUE); 4620 spa_remove(spa); 4621 } 4622 mutex_exit(&spa_namespace_lock); 4623 4624 return (0); 4625} 4626 4627/* 4628 * Destroy a storage pool. 4629 */ 4630int 4631spa_destroy(char *pool) 4632{ 4633 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 4634 B_FALSE, B_FALSE)); 4635} 4636 4637/* 4638 * Export a storage pool. 4639 */ 4640int 4641spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 4642 boolean_t hardforce) 4643{ 4644 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 4645 force, hardforce)); 4646} 4647 4648/* 4649 * Similar to spa_export(), this unloads the spa_t without actually removing it 4650 * from the namespace in any way. 4651 */ 4652int 4653spa_reset(char *pool) 4654{ 4655 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 4656 B_FALSE, B_FALSE)); 4657} 4658 4659/* 4660 * ========================================================================== 4661 * Device manipulation 4662 * ========================================================================== 4663 */ 4664 4665/* 4666 * Add a device to a storage pool. 4667 */ 4668int 4669spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 4670{ 4671 uint64_t txg, id; 4672 int error; 4673 vdev_t *rvd = spa->spa_root_vdev; 4674 vdev_t *vd, *tvd; 4675 nvlist_t **spares, **l2cache; 4676 uint_t nspares, nl2cache; 4677 4678 ASSERT(spa_writeable(spa)); 4679 4680 txg = spa_vdev_enter(spa); 4681 4682 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 4683 VDEV_ALLOC_ADD)) != 0) 4684 return (spa_vdev_exit(spa, NULL, txg, error)); 4685 4686 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 4687 4688 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 4689 &nspares) != 0) 4690 nspares = 0; 4691 4692 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 4693 &nl2cache) != 0) 4694 nl2cache = 0; 4695 4696 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 4697 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 4698 4699 if (vd->vdev_children != 0 && 4700 (error = vdev_create(vd, txg, B_FALSE)) != 0) 4701 return (spa_vdev_exit(spa, vd, txg, error)); 4702 4703 /* 4704 * We must validate the spares and l2cache devices after checking the 4705 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 4706 */ 4707 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 4708 return (spa_vdev_exit(spa, vd, txg, error)); 4709 4710 /* 4711 * Transfer each new top-level vdev from vd to rvd. 4712 */ 4713 for (int c = 0; c < vd->vdev_children; c++) { 4714 4715 /* 4716 * Set the vdev id to the first hole, if one exists. 4717 */ 4718 for (id = 0; id < rvd->vdev_children; id++) { 4719 if (rvd->vdev_child[id]->vdev_ishole) { 4720 vdev_free(rvd->vdev_child[id]); 4721 break; 4722 } 4723 } 4724 tvd = vd->vdev_child[c]; 4725 vdev_remove_child(vd, tvd); 4726 tvd->vdev_id = id; 4727 vdev_add_child(rvd, tvd); 4728 vdev_config_dirty(tvd); 4729 } 4730 4731 if (nspares != 0) { 4732 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 4733 ZPOOL_CONFIG_SPARES); 4734 spa_load_spares(spa); 4735 spa->spa_spares.sav_sync = B_TRUE; 4736 } 4737 4738 if (nl2cache != 0) { 4739 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 4740 ZPOOL_CONFIG_L2CACHE); 4741 spa_load_l2cache(spa); 4742 spa->spa_l2cache.sav_sync = B_TRUE; 4743 } 4744 4745 /* 4746 * We have to be careful when adding new vdevs to an existing pool. 4747 * If other threads start allocating from these vdevs before we 4748 * sync the config cache, and we lose power, then upon reboot we may 4749 * fail to open the pool because there are DVAs that the config cache 4750 * can't translate. Therefore, we first add the vdevs without 4751 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 4752 * and then let spa_config_update() initialize the new metaslabs. 4753 * 4754 * spa_load() checks for added-but-not-initialized vdevs, so that 4755 * if we lose power at any point in this sequence, the remaining 4756 * steps will be completed the next time we load the pool. 4757 */ 4758 (void) spa_vdev_exit(spa, vd, txg, 0); 4759 4760 mutex_enter(&spa_namespace_lock); 4761 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4762 spa_event_notify(spa, NULL, ESC_ZFS_VDEV_ADD); 4763 mutex_exit(&spa_namespace_lock); 4764 4765 return (0); 4766} 4767 4768/* 4769 * Attach a device to a mirror. The arguments are the path to any device 4770 * in the mirror, and the nvroot for the new device. If the path specifies 4771 * a device that is not mirrored, we automatically insert the mirror vdev. 4772 * 4773 * If 'replacing' is specified, the new device is intended to replace the 4774 * existing device; in this case the two devices are made into their own 4775 * mirror using the 'replacing' vdev, which is functionally identical to 4776 * the mirror vdev (it actually reuses all the same ops) but has a few 4777 * extra rules: you can't attach to it after it's been created, and upon 4778 * completion of resilvering, the first disk (the one being replaced) 4779 * is automatically detached. 4780 */ 4781int 4782spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 4783{ 4784 uint64_t txg, dtl_max_txg; 4785 vdev_t *rvd = spa->spa_root_vdev; 4786 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 4787 vdev_ops_t *pvops; 4788 char *oldvdpath, *newvdpath; 4789 int newvd_isspare; 4790 int error; 4791 4792 ASSERT(spa_writeable(spa)); 4793 4794 txg = spa_vdev_enter(spa); 4795 4796 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 4797 4798 if (oldvd == NULL) 4799 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4800 4801 if (!oldvd->vdev_ops->vdev_op_leaf) 4802 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4803 4804 pvd = oldvd->vdev_parent; 4805 4806 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 4807 VDEV_ALLOC_ATTACH)) != 0) 4808 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 4809 4810 if (newrootvd->vdev_children != 1) 4811 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4812 4813 newvd = newrootvd->vdev_child[0]; 4814 4815 if (!newvd->vdev_ops->vdev_op_leaf) 4816 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4817 4818 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 4819 return (spa_vdev_exit(spa, newrootvd, txg, error)); 4820 4821 /* 4822 * Spares can't replace logs 4823 */ 4824 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 4825 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4826 4827 if (!replacing) { 4828 /* 4829 * For attach, the only allowable parent is a mirror or the root 4830 * vdev. 4831 */ 4832 if (pvd->vdev_ops != &vdev_mirror_ops && 4833 pvd->vdev_ops != &vdev_root_ops) 4834 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4835 4836 pvops = &vdev_mirror_ops; 4837 } else { 4838 /* 4839 * Active hot spares can only be replaced by inactive hot 4840 * spares. 4841 */ 4842 if (pvd->vdev_ops == &vdev_spare_ops && 4843 oldvd->vdev_isspare && 4844 !spa_has_spare(spa, newvd->vdev_guid)) 4845 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4846 4847 /* 4848 * If the source is a hot spare, and the parent isn't already a 4849 * spare, then we want to create a new hot spare. Otherwise, we 4850 * want to create a replacing vdev. The user is not allowed to 4851 * attach to a spared vdev child unless the 'isspare' state is 4852 * the same (spare replaces spare, non-spare replaces 4853 * non-spare). 4854 */ 4855 if (pvd->vdev_ops == &vdev_replacing_ops && 4856 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 4857 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4858 } else if (pvd->vdev_ops == &vdev_spare_ops && 4859 newvd->vdev_isspare != oldvd->vdev_isspare) { 4860 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4861 } 4862 4863 if (newvd->vdev_isspare) 4864 pvops = &vdev_spare_ops; 4865 else 4866 pvops = &vdev_replacing_ops; 4867 } 4868 4869 /* 4870 * Make sure the new device is big enough. 4871 */ 4872 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 4873 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 4874 4875 /* 4876 * The new device cannot have a higher alignment requirement 4877 * than the top-level vdev. 4878 */ 4879 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 4880 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 4881 4882 /* 4883 * If this is an in-place replacement, update oldvd's path and devid 4884 * to make it distinguishable from newvd, and unopenable from now on. 4885 */ 4886 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 4887 spa_strfree(oldvd->vdev_path); 4888 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 4889 KM_SLEEP); 4890 (void) sprintf(oldvd->vdev_path, "%s/%s", 4891 newvd->vdev_path, "old"); 4892 if (oldvd->vdev_devid != NULL) { 4893 spa_strfree(oldvd->vdev_devid); 4894 oldvd->vdev_devid = NULL; 4895 } 4896 } 4897 4898 /* mark the device being resilvered */ 4899 newvd->vdev_resilver_txg = txg; 4900 4901 /* 4902 * If the parent is not a mirror, or if we're replacing, insert the new 4903 * mirror/replacing/spare vdev above oldvd. 4904 */ 4905 if (pvd->vdev_ops != pvops) 4906 pvd = vdev_add_parent(oldvd, pvops); 4907 4908 ASSERT(pvd->vdev_top->vdev_parent == rvd); 4909 ASSERT(pvd->vdev_ops == pvops); 4910 ASSERT(oldvd->vdev_parent == pvd); 4911 4912 /* 4913 * Extract the new device from its root and add it to pvd. 4914 */ 4915 vdev_remove_child(newrootvd, newvd); 4916 newvd->vdev_id = pvd->vdev_children; 4917 newvd->vdev_crtxg = oldvd->vdev_crtxg; 4918 vdev_add_child(pvd, newvd); 4919 4920 tvd = newvd->vdev_top; 4921 ASSERT(pvd->vdev_top == tvd); 4922 ASSERT(tvd->vdev_parent == rvd); 4923 4924 vdev_config_dirty(tvd); 4925 4926 /* 4927 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 4928 * for any dmu_sync-ed blocks. It will propagate upward when 4929 * spa_vdev_exit() calls vdev_dtl_reassess(). 4930 */ 4931 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 4932 4933 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 4934 dtl_max_txg - TXG_INITIAL); 4935 4936 if (newvd->vdev_isspare) { 4937 spa_spare_activate(newvd); 4938 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE); 4939 } 4940 4941 oldvdpath = spa_strdup(oldvd->vdev_path); 4942 newvdpath = spa_strdup(newvd->vdev_path); 4943 newvd_isspare = newvd->vdev_isspare; 4944 4945 /* 4946 * Mark newvd's DTL dirty in this txg. 4947 */ 4948 vdev_dirty(tvd, VDD_DTL, newvd, txg); 4949 4950 /* 4951 * Schedule the resilver to restart in the future. We do this to 4952 * ensure that dmu_sync-ed blocks have been stitched into the 4953 * respective datasets. 4954 */ 4955 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 4956 4957 if (spa->spa_bootfs) 4958 spa_event_notify(spa, newvd, ESC_ZFS_BOOTFS_VDEV_ATTACH); 4959 4960 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_ATTACH); 4961 4962 /* 4963 * Commit the config 4964 */ 4965 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 4966 4967 spa_history_log_internal(spa, "vdev attach", NULL, 4968 "%s vdev=%s %s vdev=%s", 4969 replacing && newvd_isspare ? "spare in" : 4970 replacing ? "replace" : "attach", newvdpath, 4971 replacing ? "for" : "to", oldvdpath); 4972 4973 spa_strfree(oldvdpath); 4974 spa_strfree(newvdpath); 4975 4976 return (0); 4977} 4978 4979/* 4980 * Detach a device from a mirror or replacing vdev. 4981 * 4982 * If 'replace_done' is specified, only detach if the parent 4983 * is a replacing vdev. 4984 */ 4985int 4986spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 4987{ 4988 uint64_t txg; 4989 int error; 4990 vdev_t *rvd = spa->spa_root_vdev; 4991 vdev_t *vd, *pvd, *cvd, *tvd; 4992 boolean_t unspare = B_FALSE; 4993 uint64_t unspare_guid = 0; 4994 char *vdpath; 4995 4996 ASSERT(spa_writeable(spa)); 4997 4998 txg = spa_vdev_enter(spa); 4999 5000 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5001 5002 if (vd == NULL) 5003 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 5004 5005 if (!vd->vdev_ops->vdev_op_leaf) 5006 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5007 5008 pvd = vd->vdev_parent; 5009 5010 /* 5011 * If the parent/child relationship is not as expected, don't do it. 5012 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 5013 * vdev that's replacing B with C. The user's intent in replacing 5014 * is to go from M(A,B) to M(A,C). If the user decides to cancel 5015 * the replace by detaching C, the expected behavior is to end up 5016 * M(A,B). But suppose that right after deciding to detach C, 5017 * the replacement of B completes. We would have M(A,C), and then 5018 * ask to detach C, which would leave us with just A -- not what 5019 * the user wanted. To prevent this, we make sure that the 5020 * parent/child relationship hasn't changed -- in this example, 5021 * that C's parent is still the replacing vdev R. 5022 */ 5023 if (pvd->vdev_guid != pguid && pguid != 0) 5024 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5025 5026 /* 5027 * Only 'replacing' or 'spare' vdevs can be replaced. 5028 */ 5029 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 5030 pvd->vdev_ops != &vdev_spare_ops) 5031 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5032 5033 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 5034 spa_version(spa) >= SPA_VERSION_SPARES); 5035 5036 /* 5037 * Only mirror, replacing, and spare vdevs support detach. 5038 */ 5039 if (pvd->vdev_ops != &vdev_replacing_ops && 5040 pvd->vdev_ops != &vdev_mirror_ops && 5041 pvd->vdev_ops != &vdev_spare_ops) 5042 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5043 5044 /* 5045 * If this device has the only valid copy of some data, 5046 * we cannot safely detach it. 5047 */ 5048 if (vdev_dtl_required(vd)) 5049 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5050 5051 ASSERT(pvd->vdev_children >= 2); 5052 5053 /* 5054 * If we are detaching the second disk from a replacing vdev, then 5055 * check to see if we changed the original vdev's path to have "/old" 5056 * at the end in spa_vdev_attach(). If so, undo that change now. 5057 */ 5058 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 5059 vd->vdev_path != NULL) { 5060 size_t len = strlen(vd->vdev_path); 5061 5062 for (int c = 0; c < pvd->vdev_children; c++) { 5063 cvd = pvd->vdev_child[c]; 5064 5065 if (cvd == vd || cvd->vdev_path == NULL) 5066 continue; 5067 5068 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 5069 strcmp(cvd->vdev_path + len, "/old") == 0) { 5070 spa_strfree(cvd->vdev_path); 5071 cvd->vdev_path = spa_strdup(vd->vdev_path); 5072 break; 5073 } 5074 } 5075 } 5076 5077 /* 5078 * If we are detaching the original disk from a spare, then it implies 5079 * that the spare should become a real disk, and be removed from the 5080 * active spare list for the pool. 5081 */ 5082 if (pvd->vdev_ops == &vdev_spare_ops && 5083 vd->vdev_id == 0 && 5084 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 5085 unspare = B_TRUE; 5086 5087 /* 5088 * Erase the disk labels so the disk can be used for other things. 5089 * This must be done after all other error cases are handled, 5090 * but before we disembowel vd (so we can still do I/O to it). 5091 * But if we can't do it, don't treat the error as fatal -- 5092 * it may be that the unwritability of the disk is the reason 5093 * it's being detached! 5094 */ 5095 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5096 5097 /* 5098 * Remove vd from its parent and compact the parent's children. 5099 */ 5100 vdev_remove_child(pvd, vd); 5101 vdev_compact_children(pvd); 5102 5103 /* 5104 * Remember one of the remaining children so we can get tvd below. 5105 */ 5106 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 5107 5108 /* 5109 * If we need to remove the remaining child from the list of hot spares, 5110 * do it now, marking the vdev as no longer a spare in the process. 5111 * We must do this before vdev_remove_parent(), because that can 5112 * change the GUID if it creates a new toplevel GUID. For a similar 5113 * reason, we must remove the spare now, in the same txg as the detach; 5114 * otherwise someone could attach a new sibling, change the GUID, and 5115 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 5116 */ 5117 if (unspare) { 5118 ASSERT(cvd->vdev_isspare); 5119 spa_spare_remove(cvd); 5120 unspare_guid = cvd->vdev_guid; 5121 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 5122 cvd->vdev_unspare = B_TRUE; 5123 } 5124 5125 /* 5126 * If the parent mirror/replacing vdev only has one child, 5127 * the parent is no longer needed. Remove it from the tree. 5128 */ 5129 if (pvd->vdev_children == 1) { 5130 if (pvd->vdev_ops == &vdev_spare_ops) 5131 cvd->vdev_unspare = B_FALSE; 5132 vdev_remove_parent(cvd); 5133 } 5134 5135 5136 /* 5137 * We don't set tvd until now because the parent we just removed 5138 * may have been the previous top-level vdev. 5139 */ 5140 tvd = cvd->vdev_top; 5141 ASSERT(tvd->vdev_parent == rvd); 5142 5143 /* 5144 * Reevaluate the parent vdev state. 5145 */ 5146 vdev_propagate_state(cvd); 5147 5148 /* 5149 * If the 'autoexpand' property is set on the pool then automatically 5150 * try to expand the size of the pool. For example if the device we 5151 * just detached was smaller than the others, it may be possible to 5152 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 5153 * first so that we can obtain the updated sizes of the leaf vdevs. 5154 */ 5155 if (spa->spa_autoexpand) { 5156 vdev_reopen(tvd); 5157 vdev_expand(tvd, txg); 5158 } 5159 5160 vdev_config_dirty(tvd); 5161 5162 /* 5163 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 5164 * vd->vdev_detached is set and free vd's DTL object in syncing context. 5165 * But first make sure we're not on any *other* txg's DTL list, to 5166 * prevent vd from being accessed after it's freed. 5167 */ 5168 vdpath = spa_strdup(vd->vdev_path); 5169 for (int t = 0; t < TXG_SIZE; t++) 5170 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 5171 vd->vdev_detached = B_TRUE; 5172 vdev_dirty(tvd, VDD_DTL, vd, txg); 5173 5174 spa_event_notify(spa, vd, ESC_ZFS_VDEV_REMOVE); 5175 5176 /* hang on to the spa before we release the lock */ 5177 spa_open_ref(spa, FTAG); 5178 5179 error = spa_vdev_exit(spa, vd, txg, 0); 5180 5181 spa_history_log_internal(spa, "detach", NULL, 5182 "vdev=%s", vdpath); 5183 spa_strfree(vdpath); 5184 5185 /* 5186 * If this was the removal of the original device in a hot spare vdev, 5187 * then we want to go through and remove the device from the hot spare 5188 * list of every other pool. 5189 */ 5190 if (unspare) { 5191 spa_t *altspa = NULL; 5192 5193 mutex_enter(&spa_namespace_lock); 5194 while ((altspa = spa_next(altspa)) != NULL) { 5195 if (altspa->spa_state != POOL_STATE_ACTIVE || 5196 altspa == spa) 5197 continue; 5198 5199 spa_open_ref(altspa, FTAG); 5200 mutex_exit(&spa_namespace_lock); 5201 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 5202 mutex_enter(&spa_namespace_lock); 5203 spa_close(altspa, FTAG); 5204 } 5205 mutex_exit(&spa_namespace_lock); 5206 5207 /* search the rest of the vdevs for spares to remove */ 5208 spa_vdev_resilver_done(spa); 5209 } 5210 5211 /* all done with the spa; OK to release */ 5212 mutex_enter(&spa_namespace_lock); 5213 spa_close(spa, FTAG); 5214 mutex_exit(&spa_namespace_lock); 5215 5216 return (error); 5217} 5218 5219/* 5220 * Split a set of devices from their mirrors, and create a new pool from them. 5221 */ 5222int 5223spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 5224 nvlist_t *props, boolean_t exp) 5225{ 5226 int error = 0; 5227 uint64_t txg, *glist; 5228 spa_t *newspa; 5229 uint_t c, children, lastlog; 5230 nvlist_t **child, *nvl, *tmp; 5231 dmu_tx_t *tx; 5232 char *altroot = NULL; 5233 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 5234 boolean_t activate_slog; 5235 5236 ASSERT(spa_writeable(spa)); 5237 5238 txg = spa_vdev_enter(spa); 5239 5240 /* clear the log and flush everything up to now */ 5241 activate_slog = spa_passivate_log(spa); 5242 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5243 error = spa_offline_log(spa); 5244 txg = spa_vdev_config_enter(spa); 5245 5246 if (activate_slog) 5247 spa_activate_log(spa); 5248 5249 if (error != 0) 5250 return (spa_vdev_exit(spa, NULL, txg, error)); 5251 5252 /* check new spa name before going any further */ 5253 if (spa_lookup(newname) != NULL) 5254 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 5255 5256 /* 5257 * scan through all the children to ensure they're all mirrors 5258 */ 5259 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 5260 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 5261 &children) != 0) 5262 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5263 5264 /* first, check to ensure we've got the right child count */ 5265 rvd = spa->spa_root_vdev; 5266 lastlog = 0; 5267 for (c = 0; c < rvd->vdev_children; c++) { 5268 vdev_t *vd = rvd->vdev_child[c]; 5269 5270 /* don't count the holes & logs as children */ 5271 if (vd->vdev_islog || vd->vdev_ishole) { 5272 if (lastlog == 0) 5273 lastlog = c; 5274 continue; 5275 } 5276 5277 lastlog = 0; 5278 } 5279 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 5280 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5281 5282 /* next, ensure no spare or cache devices are part of the split */ 5283 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 5284 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 5285 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5286 5287 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 5288 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 5289 5290 /* then, loop over each vdev and validate it */ 5291 for (c = 0; c < children; c++) { 5292 uint64_t is_hole = 0; 5293 5294 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 5295 &is_hole); 5296 5297 if (is_hole != 0) { 5298 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 5299 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 5300 continue; 5301 } else { 5302 error = SET_ERROR(EINVAL); 5303 break; 5304 } 5305 } 5306 5307 /* which disk is going to be split? */ 5308 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 5309 &glist[c]) != 0) { 5310 error = SET_ERROR(EINVAL); 5311 break; 5312 } 5313 5314 /* look it up in the spa */ 5315 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 5316 if (vml[c] == NULL) { 5317 error = SET_ERROR(ENODEV); 5318 break; 5319 } 5320 5321 /* make sure there's nothing stopping the split */ 5322 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 5323 vml[c]->vdev_islog || 5324 vml[c]->vdev_ishole || 5325 vml[c]->vdev_isspare || 5326 vml[c]->vdev_isl2cache || 5327 !vdev_writeable(vml[c]) || 5328 vml[c]->vdev_children != 0 || 5329 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 5330 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 5331 error = SET_ERROR(EINVAL); 5332 break; 5333 } 5334 5335 if (vdev_dtl_required(vml[c])) { 5336 error = SET_ERROR(EBUSY); 5337 break; 5338 } 5339 5340 /* we need certain info from the top level */ 5341 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 5342 vml[c]->vdev_top->vdev_ms_array) == 0); 5343 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 5344 vml[c]->vdev_top->vdev_ms_shift) == 0); 5345 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 5346 vml[c]->vdev_top->vdev_asize) == 0); 5347 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 5348 vml[c]->vdev_top->vdev_ashift) == 0); 5349 } 5350 5351 if (error != 0) { 5352 kmem_free(vml, children * sizeof (vdev_t *)); 5353 kmem_free(glist, children * sizeof (uint64_t)); 5354 return (spa_vdev_exit(spa, NULL, txg, error)); 5355 } 5356 5357 /* stop writers from using the disks */ 5358 for (c = 0; c < children; c++) { 5359 if (vml[c] != NULL) 5360 vml[c]->vdev_offline = B_TRUE; 5361 } 5362 vdev_reopen(spa->spa_root_vdev); 5363 5364 /* 5365 * Temporarily record the splitting vdevs in the spa config. This 5366 * will disappear once the config is regenerated. 5367 */ 5368 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5369 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 5370 glist, children) == 0); 5371 kmem_free(glist, children * sizeof (uint64_t)); 5372 5373 mutex_enter(&spa->spa_props_lock); 5374 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 5375 nvl) == 0); 5376 mutex_exit(&spa->spa_props_lock); 5377 spa->spa_config_splitting = nvl; 5378 vdev_config_dirty(spa->spa_root_vdev); 5379 5380 /* configure and create the new pool */ 5381 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 5382 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5383 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 5384 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 5385 spa_version(spa)) == 0); 5386 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 5387 spa->spa_config_txg) == 0); 5388 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 5389 spa_generate_guid(NULL)) == 0); 5390 (void) nvlist_lookup_string(props, 5391 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5392 5393 /* add the new pool to the namespace */ 5394 newspa = spa_add(newname, config, altroot); 5395 newspa->spa_config_txg = spa->spa_config_txg; 5396 spa_set_log_state(newspa, SPA_LOG_CLEAR); 5397 5398 /* release the spa config lock, retaining the namespace lock */ 5399 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5400 5401 if (zio_injection_enabled) 5402 zio_handle_panic_injection(spa, FTAG, 1); 5403 5404 spa_activate(newspa, spa_mode_global); 5405 spa_async_suspend(newspa); 5406 5407#ifndef illumos 5408 /* mark that we are creating new spa by splitting */ 5409 newspa->spa_splitting_newspa = B_TRUE; 5410#endif 5411 /* create the new pool from the disks of the original pool */ 5412 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE); 5413#ifndef illumos 5414 newspa->spa_splitting_newspa = B_FALSE; 5415#endif 5416 if (error) 5417 goto out; 5418 5419 /* if that worked, generate a real config for the new pool */ 5420 if (newspa->spa_root_vdev != NULL) { 5421 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 5422 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5423 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 5424 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 5425 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 5426 B_TRUE)); 5427 } 5428 5429 /* set the props */ 5430 if (props != NULL) { 5431 spa_configfile_set(newspa, props, B_FALSE); 5432 error = spa_prop_set(newspa, props); 5433 if (error) 5434 goto out; 5435 } 5436 5437 /* flush everything */ 5438 txg = spa_vdev_config_enter(newspa); 5439 vdev_config_dirty(newspa->spa_root_vdev); 5440 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 5441 5442 if (zio_injection_enabled) 5443 zio_handle_panic_injection(spa, FTAG, 2); 5444 5445 spa_async_resume(newspa); 5446 5447 /* finally, update the original pool's config */ 5448 txg = spa_vdev_config_enter(spa); 5449 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 5450 error = dmu_tx_assign(tx, TXG_WAIT); 5451 if (error != 0) 5452 dmu_tx_abort(tx); 5453 for (c = 0; c < children; c++) { 5454 if (vml[c] != NULL) { 5455 vdev_split(vml[c]); 5456 if (error == 0) 5457 spa_history_log_internal(spa, "detach", tx, 5458 "vdev=%s", vml[c]->vdev_path); 5459 vdev_free(vml[c]); 5460 } 5461 } 5462 vdev_config_dirty(spa->spa_root_vdev); 5463 spa->spa_config_splitting = NULL; 5464 nvlist_free(nvl); 5465 if (error == 0) 5466 dmu_tx_commit(tx); 5467 (void) spa_vdev_exit(spa, NULL, txg, 0); 5468 5469 if (zio_injection_enabled) 5470 zio_handle_panic_injection(spa, FTAG, 3); 5471 5472 /* split is complete; log a history record */ 5473 spa_history_log_internal(newspa, "split", NULL, 5474 "from pool %s", spa_name(spa)); 5475 5476 kmem_free(vml, children * sizeof (vdev_t *)); 5477 5478 /* if we're not going to mount the filesystems in userland, export */ 5479 if (exp) 5480 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 5481 B_FALSE, B_FALSE); 5482 5483 return (error); 5484 5485out: 5486 spa_unload(newspa); 5487 spa_deactivate(newspa); 5488 spa_remove(newspa); 5489 5490 txg = spa_vdev_config_enter(spa); 5491 5492 /* re-online all offlined disks */ 5493 for (c = 0; c < children; c++) { 5494 if (vml[c] != NULL) 5495 vml[c]->vdev_offline = B_FALSE; 5496 } 5497 vdev_reopen(spa->spa_root_vdev); 5498 5499 nvlist_free(spa->spa_config_splitting); 5500 spa->spa_config_splitting = NULL; 5501 (void) spa_vdev_exit(spa, NULL, txg, error); 5502 5503 kmem_free(vml, children * sizeof (vdev_t *)); 5504 return (error); 5505} 5506 5507static nvlist_t * 5508spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid) 5509{ 5510 for (int i = 0; i < count; i++) { 5511 uint64_t guid; 5512 5513 VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID, 5514 &guid) == 0); 5515 5516 if (guid == target_guid) 5517 return (nvpp[i]); 5518 } 5519 5520 return (NULL); 5521} 5522 5523static void 5524spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count, 5525 nvlist_t *dev_to_remove) 5526{ 5527 nvlist_t **newdev = NULL; 5528 5529 if (count > 1) 5530 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP); 5531 5532 for (int i = 0, j = 0; i < count; i++) { 5533 if (dev[i] == dev_to_remove) 5534 continue; 5535 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0); 5536 } 5537 5538 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0); 5539 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0); 5540 5541 for (int i = 0; i < count - 1; i++) 5542 nvlist_free(newdev[i]); 5543 5544 if (count > 1) 5545 kmem_free(newdev, (count - 1) * sizeof (void *)); 5546} 5547 5548/* 5549 * Evacuate the device. 5550 */ 5551static int 5552spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd) 5553{ 5554 uint64_t txg; 5555 int error = 0; 5556 5557 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5558 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5559 ASSERT(vd == vd->vdev_top); 5560 5561 /* 5562 * Evacuate the device. We don't hold the config lock as writer 5563 * since we need to do I/O but we do keep the 5564 * spa_namespace_lock held. Once this completes the device 5565 * should no longer have any blocks allocated on it. 5566 */ 5567 if (vd->vdev_islog) { 5568 if (vd->vdev_stat.vs_alloc != 0) 5569 error = spa_offline_log(spa); 5570 } else { 5571 error = SET_ERROR(ENOTSUP); 5572 } 5573 5574 if (error) 5575 return (error); 5576 5577 /* 5578 * The evacuation succeeded. Remove any remaining MOS metadata 5579 * associated with this vdev, and wait for these changes to sync. 5580 */ 5581 ASSERT0(vd->vdev_stat.vs_alloc); 5582 txg = spa_vdev_config_enter(spa); 5583 vd->vdev_removing = B_TRUE; 5584 vdev_dirty_leaves(vd, VDD_DTL, txg); 5585 vdev_config_dirty(vd); 5586 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5587 5588 return (0); 5589} 5590 5591/* 5592 * Complete the removal by cleaning up the namespace. 5593 */ 5594static void 5595spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd) 5596{ 5597 vdev_t *rvd = spa->spa_root_vdev; 5598 uint64_t id = vd->vdev_id; 5599 boolean_t last_vdev = (id == (rvd->vdev_children - 1)); 5600 5601 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5602 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 5603 ASSERT(vd == vd->vdev_top); 5604 5605 /* 5606 * Only remove any devices which are empty. 5607 */ 5608 if (vd->vdev_stat.vs_alloc != 0) 5609 return; 5610 5611 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5612 5613 if (list_link_active(&vd->vdev_state_dirty_node)) 5614 vdev_state_clean(vd); 5615 if (list_link_active(&vd->vdev_config_dirty_node)) 5616 vdev_config_clean(vd); 5617 5618 vdev_free(vd); 5619 5620 if (last_vdev) { 5621 vdev_compact_children(rvd); 5622 } else { 5623 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops); 5624 vdev_add_child(rvd, vd); 5625 } 5626 vdev_config_dirty(rvd); 5627 5628 /* 5629 * Reassess the health of our root vdev. 5630 */ 5631 vdev_reopen(rvd); 5632} 5633 5634/* 5635 * Remove a device from the pool - 5636 * 5637 * Removing a device from the vdev namespace requires several steps 5638 * and can take a significant amount of time. As a result we use 5639 * the spa_vdev_config_[enter/exit] functions which allow us to 5640 * grab and release the spa_config_lock while still holding the namespace 5641 * lock. During each step the configuration is synced out. 5642 * 5643 * Currently, this supports removing only hot spares, slogs, and level 2 ARC 5644 * devices. 5645 */ 5646int 5647spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare) 5648{ 5649 vdev_t *vd; 5650 sysevent_t *ev = NULL; 5651 metaslab_group_t *mg; 5652 nvlist_t **spares, **l2cache, *nv; 5653 uint64_t txg = 0; 5654 uint_t nspares, nl2cache; 5655 int error = 0; 5656 boolean_t locked = MUTEX_HELD(&spa_namespace_lock); 5657 5658 ASSERT(spa_writeable(spa)); 5659 5660 if (!locked) 5661 txg = spa_vdev_enter(spa); 5662 5663 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5664 5665 if (spa->spa_spares.sav_vdevs != NULL && 5666 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 5667 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 && 5668 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) { 5669 /* 5670 * Only remove the hot spare if it's not currently in use 5671 * in this pool. 5672 */ 5673 if (vd == NULL || unspare) { 5674 if (vd == NULL) 5675 vd = spa_lookup_by_guid(spa, guid, B_TRUE); 5676 ev = spa_event_create(spa, vd, ESC_ZFS_VDEV_REMOVE_AUX); 5677 spa_vdev_remove_aux(spa->spa_spares.sav_config, 5678 ZPOOL_CONFIG_SPARES, spares, nspares, nv); 5679 spa_load_spares(spa); 5680 spa->spa_spares.sav_sync = B_TRUE; 5681 } else { 5682 error = SET_ERROR(EBUSY); 5683 } 5684 } else if (spa->spa_l2cache.sav_vdevs != NULL && 5685 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 5686 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 && 5687 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) { 5688 /* 5689 * Cache devices can always be removed. 5690 */ 5691 vd = spa_lookup_by_guid(spa, guid, B_TRUE); 5692 ev = spa_event_create(spa, vd, ESC_ZFS_VDEV_REMOVE_AUX); 5693 spa_vdev_remove_aux(spa->spa_l2cache.sav_config, 5694 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv); 5695 spa_load_l2cache(spa); 5696 spa->spa_l2cache.sav_sync = B_TRUE; 5697 } else if (vd != NULL && vd->vdev_islog) { 5698 ASSERT(!locked); 5699 ASSERT(vd == vd->vdev_top); 5700 5701 mg = vd->vdev_mg; 5702 5703 /* 5704 * Stop allocating from this vdev. 5705 */ 5706 metaslab_group_passivate(mg); 5707 5708 /* 5709 * Wait for the youngest allocations and frees to sync, 5710 * and then wait for the deferral of those frees to finish. 5711 */ 5712 spa_vdev_config_exit(spa, NULL, 5713 txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG); 5714 5715 /* 5716 * Attempt to evacuate the vdev. 5717 */ 5718 error = spa_vdev_remove_evacuate(spa, vd); 5719 5720 txg = spa_vdev_config_enter(spa); 5721 5722 /* 5723 * If we couldn't evacuate the vdev, unwind. 5724 */ 5725 if (error) { 5726 metaslab_group_activate(mg); 5727 return (spa_vdev_exit(spa, NULL, txg, error)); 5728 } 5729 5730 /* 5731 * Clean up the vdev namespace. 5732 */ 5733 ev = spa_event_create(spa, vd, ESC_ZFS_VDEV_REMOVE_DEV); 5734 spa_vdev_remove_from_namespace(spa, vd); 5735 5736 } else if (vd != NULL) { 5737 /* 5738 * Normal vdevs cannot be removed (yet). 5739 */ 5740 error = SET_ERROR(ENOTSUP); 5741 } else { 5742 /* 5743 * There is no vdev of any kind with the specified guid. 5744 */ 5745 error = SET_ERROR(ENOENT); 5746 } 5747 5748 if (!locked) 5749 error = spa_vdev_exit(spa, NULL, txg, error); 5750 5751 if (ev) 5752 spa_event_post(ev); 5753 5754 return (error); 5755} 5756 5757/* 5758 * Find any device that's done replacing, or a vdev marked 'unspare' that's 5759 * currently spared, so we can detach it. 5760 */ 5761static vdev_t * 5762spa_vdev_resilver_done_hunt(vdev_t *vd) 5763{ 5764 vdev_t *newvd, *oldvd; 5765 5766 for (int c = 0; c < vd->vdev_children; c++) { 5767 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 5768 if (oldvd != NULL) 5769 return (oldvd); 5770 } 5771 5772 /* 5773 * Check for a completed replacement. We always consider the first 5774 * vdev in the list to be the oldest vdev, and the last one to be 5775 * the newest (see spa_vdev_attach() for how that works). In 5776 * the case where the newest vdev is faulted, we will not automatically 5777 * remove it after a resilver completes. This is OK as it will require 5778 * user intervention to determine which disk the admin wishes to keep. 5779 */ 5780 if (vd->vdev_ops == &vdev_replacing_ops) { 5781 ASSERT(vd->vdev_children > 1); 5782 5783 newvd = vd->vdev_child[vd->vdev_children - 1]; 5784 oldvd = vd->vdev_child[0]; 5785 5786 if (vdev_dtl_empty(newvd, DTL_MISSING) && 5787 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5788 !vdev_dtl_required(oldvd)) 5789 return (oldvd); 5790 } 5791 5792 /* 5793 * Check for a completed resilver with the 'unspare' flag set. 5794 */ 5795 if (vd->vdev_ops == &vdev_spare_ops) { 5796 vdev_t *first = vd->vdev_child[0]; 5797 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 5798 5799 if (last->vdev_unspare) { 5800 oldvd = first; 5801 newvd = last; 5802 } else if (first->vdev_unspare) { 5803 oldvd = last; 5804 newvd = first; 5805 } else { 5806 oldvd = NULL; 5807 } 5808 5809 if (oldvd != NULL && 5810 vdev_dtl_empty(newvd, DTL_MISSING) && 5811 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5812 !vdev_dtl_required(oldvd)) 5813 return (oldvd); 5814 5815 /* 5816 * If there are more than two spares attached to a disk, 5817 * and those spares are not required, then we want to 5818 * attempt to free them up now so that they can be used 5819 * by other pools. Once we're back down to a single 5820 * disk+spare, we stop removing them. 5821 */ 5822 if (vd->vdev_children > 2) { 5823 newvd = vd->vdev_child[1]; 5824 5825 if (newvd->vdev_isspare && last->vdev_isspare && 5826 vdev_dtl_empty(last, DTL_MISSING) && 5827 vdev_dtl_empty(last, DTL_OUTAGE) && 5828 !vdev_dtl_required(newvd)) 5829 return (newvd); 5830 } 5831 } 5832 5833 return (NULL); 5834} 5835 5836static void 5837spa_vdev_resilver_done(spa_t *spa) 5838{ 5839 vdev_t *vd, *pvd, *ppvd; 5840 uint64_t guid, sguid, pguid, ppguid; 5841 5842 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5843 5844 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 5845 pvd = vd->vdev_parent; 5846 ppvd = pvd->vdev_parent; 5847 guid = vd->vdev_guid; 5848 pguid = pvd->vdev_guid; 5849 ppguid = ppvd->vdev_guid; 5850 sguid = 0; 5851 /* 5852 * If we have just finished replacing a hot spared device, then 5853 * we need to detach the parent's first child (the original hot 5854 * spare) as well. 5855 */ 5856 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 5857 ppvd->vdev_children == 2) { 5858 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 5859 sguid = ppvd->vdev_child[1]->vdev_guid; 5860 } 5861 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 5862 5863 spa_config_exit(spa, SCL_ALL, FTAG); 5864 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 5865 return; 5866 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 5867 return; 5868 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5869 } 5870 5871 spa_config_exit(spa, SCL_ALL, FTAG); 5872} 5873 5874/* 5875 * Update the stored path or FRU for this vdev. 5876 */ 5877int 5878spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 5879 boolean_t ispath) 5880{ 5881 vdev_t *vd; 5882 boolean_t sync = B_FALSE; 5883 5884 ASSERT(spa_writeable(spa)); 5885 5886 spa_vdev_state_enter(spa, SCL_ALL); 5887 5888 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 5889 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 5890 5891 if (!vd->vdev_ops->vdev_op_leaf) 5892 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 5893 5894 if (ispath) { 5895 if (strcmp(value, vd->vdev_path) != 0) { 5896 spa_strfree(vd->vdev_path); 5897 vd->vdev_path = spa_strdup(value); 5898 sync = B_TRUE; 5899 } 5900 } else { 5901 if (vd->vdev_fru == NULL) { 5902 vd->vdev_fru = spa_strdup(value); 5903 sync = B_TRUE; 5904 } else if (strcmp(value, vd->vdev_fru) != 0) { 5905 spa_strfree(vd->vdev_fru); 5906 vd->vdev_fru = spa_strdup(value); 5907 sync = B_TRUE; 5908 } 5909 } 5910 5911 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 5912} 5913 5914int 5915spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 5916{ 5917 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 5918} 5919 5920int 5921spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 5922{ 5923 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 5924} 5925 5926/* 5927 * ========================================================================== 5928 * SPA Scanning 5929 * ========================================================================== 5930 */ 5931 5932int 5933spa_scan_stop(spa_t *spa) 5934{ 5935 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5936 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 5937 return (SET_ERROR(EBUSY)); 5938 return (dsl_scan_cancel(spa->spa_dsl_pool)); 5939} 5940 5941int 5942spa_scan(spa_t *spa, pool_scan_func_t func) 5943{ 5944 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5945 5946 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 5947 return (SET_ERROR(ENOTSUP)); 5948 5949 /* 5950 * If a resilver was requested, but there is no DTL on a 5951 * writeable leaf device, we have nothing to do. 5952 */ 5953 if (func == POOL_SCAN_RESILVER && 5954 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 5955 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 5956 return (0); 5957 } 5958 5959 return (dsl_scan(spa->spa_dsl_pool, func)); 5960} 5961 5962/* 5963 * ========================================================================== 5964 * SPA async task processing 5965 * ========================================================================== 5966 */ 5967 5968static void 5969spa_async_remove(spa_t *spa, vdev_t *vd) 5970{ 5971 if (vd->vdev_remove_wanted) { 5972 vd->vdev_remove_wanted = B_FALSE; 5973 vd->vdev_delayed_close = B_FALSE; 5974 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 5975 5976 /* 5977 * We want to clear the stats, but we don't want to do a full 5978 * vdev_clear() as that will cause us to throw away 5979 * degraded/faulted state as well as attempt to reopen the 5980 * device, all of which is a waste. 5981 */ 5982 vd->vdev_stat.vs_read_errors = 0; 5983 vd->vdev_stat.vs_write_errors = 0; 5984 vd->vdev_stat.vs_checksum_errors = 0; 5985 5986 vdev_state_dirty(vd->vdev_top); 5987 /* Tell userspace that the vdev is gone. */ 5988 zfs_post_remove(spa, vd); 5989 } 5990 5991 for (int c = 0; c < vd->vdev_children; c++) 5992 spa_async_remove(spa, vd->vdev_child[c]); 5993} 5994 5995static void 5996spa_async_probe(spa_t *spa, vdev_t *vd) 5997{ 5998 if (vd->vdev_probe_wanted) { 5999 vd->vdev_probe_wanted = B_FALSE; 6000 vdev_reopen(vd); /* vdev_open() does the actual probe */ 6001 } 6002 6003 for (int c = 0; c < vd->vdev_children; c++) 6004 spa_async_probe(spa, vd->vdev_child[c]); 6005} 6006 6007static void 6008spa_async_autoexpand(spa_t *spa, vdev_t *vd) 6009{ 6010 sysevent_id_t eid; 6011 nvlist_t *attr; 6012 char *physpath; 6013 6014 if (!spa->spa_autoexpand) 6015 return; 6016 6017 for (int c = 0; c < vd->vdev_children; c++) { 6018 vdev_t *cvd = vd->vdev_child[c]; 6019 spa_async_autoexpand(spa, cvd); 6020 } 6021 6022 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 6023 return; 6024 6025 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 6026 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 6027 6028 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6029 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 6030 6031 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 6032 ESC_ZFS_VDEV_AUTOEXPAND, attr, &eid, DDI_SLEEP); 6033 6034 nvlist_free(attr); 6035 kmem_free(physpath, MAXPATHLEN); 6036} 6037 6038static void 6039spa_async_thread(void *arg) 6040{ 6041 spa_t *spa = arg; 6042 int tasks; 6043 6044 ASSERT(spa->spa_sync_on); 6045 6046 mutex_enter(&spa->spa_async_lock); 6047 tasks = spa->spa_async_tasks; 6048 spa->spa_async_tasks &= SPA_ASYNC_REMOVE; 6049 mutex_exit(&spa->spa_async_lock); 6050 6051 /* 6052 * See if the config needs to be updated. 6053 */ 6054 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 6055 uint64_t old_space, new_space; 6056 6057 mutex_enter(&spa_namespace_lock); 6058 old_space = metaslab_class_get_space(spa_normal_class(spa)); 6059 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 6060 new_space = metaslab_class_get_space(spa_normal_class(spa)); 6061 mutex_exit(&spa_namespace_lock); 6062 6063 /* 6064 * If the pool grew as a result of the config update, 6065 * then log an internal history event. 6066 */ 6067 if (new_space != old_space) { 6068 spa_history_log_internal(spa, "vdev online", NULL, 6069 "pool '%s' size: %llu(+%llu)", 6070 spa_name(spa), new_space, new_space - old_space); 6071 } 6072 } 6073 6074 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 6075 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6076 spa_async_autoexpand(spa, spa->spa_root_vdev); 6077 spa_config_exit(spa, SCL_CONFIG, FTAG); 6078 } 6079 6080 /* 6081 * See if any devices need to be probed. 6082 */ 6083 if (tasks & SPA_ASYNC_PROBE) { 6084 spa_vdev_state_enter(spa, SCL_NONE); 6085 spa_async_probe(spa, spa->spa_root_vdev); 6086 (void) spa_vdev_state_exit(spa, NULL, 0); 6087 } 6088 6089 /* 6090 * If any devices are done replacing, detach them. 6091 */ 6092 if (tasks & SPA_ASYNC_RESILVER_DONE) 6093 spa_vdev_resilver_done(spa); 6094 6095 /* 6096 * Kick off a resilver. 6097 */ 6098 if (tasks & SPA_ASYNC_RESILVER) 6099 dsl_resilver_restart(spa->spa_dsl_pool, 0); 6100 6101 /* 6102 * Let the world know that we're done. 6103 */ 6104 mutex_enter(&spa->spa_async_lock); 6105 spa->spa_async_thread = NULL; 6106 cv_broadcast(&spa->spa_async_cv); 6107 mutex_exit(&spa->spa_async_lock); 6108 thread_exit(); 6109} 6110 6111static void 6112spa_async_thread_vd(void *arg) 6113{ 6114 spa_t *spa = arg; 6115 int tasks; 6116 6117 ASSERT(spa->spa_sync_on); 6118 6119 mutex_enter(&spa->spa_async_lock); 6120 tasks = spa->spa_async_tasks; 6121retry: 6122 spa->spa_async_tasks &= ~SPA_ASYNC_REMOVE; 6123 mutex_exit(&spa->spa_async_lock); 6124 6125 /* 6126 * See if any devices need to be marked REMOVED. 6127 */ 6128 if (tasks & SPA_ASYNC_REMOVE) { 6129 spa_vdev_state_enter(spa, SCL_NONE); 6130 spa_async_remove(spa, spa->spa_root_vdev); 6131 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 6132 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 6133 for (int i = 0; i < spa->spa_spares.sav_count; i++) 6134 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 6135 (void) spa_vdev_state_exit(spa, NULL, 0); 6136 } 6137 6138 /* 6139 * Let the world know that we're done. 6140 */ 6141 mutex_enter(&spa->spa_async_lock); 6142 tasks = spa->spa_async_tasks; 6143 if ((tasks & SPA_ASYNC_REMOVE) != 0) 6144 goto retry; 6145 spa->spa_async_thread_vd = NULL; 6146 cv_broadcast(&spa->spa_async_cv); 6147 mutex_exit(&spa->spa_async_lock); 6148 thread_exit(); 6149} 6150 6151void 6152spa_async_suspend(spa_t *spa) 6153{ 6154 mutex_enter(&spa->spa_async_lock); 6155 spa->spa_async_suspended++; 6156 while (spa->spa_async_thread != NULL && 6157 spa->spa_async_thread_vd != NULL) 6158 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 6159 mutex_exit(&spa->spa_async_lock); 6160} 6161 6162void 6163spa_async_resume(spa_t *spa) 6164{ 6165 mutex_enter(&spa->spa_async_lock); 6166 ASSERT(spa->spa_async_suspended != 0); 6167 spa->spa_async_suspended--; 6168 mutex_exit(&spa->spa_async_lock); 6169} 6170 6171static boolean_t 6172spa_async_tasks_pending(spa_t *spa) 6173{ 6174 uint_t non_config_tasks; 6175 uint_t config_task; 6176 boolean_t config_task_suspended; 6177 6178 non_config_tasks = spa->spa_async_tasks & ~(SPA_ASYNC_CONFIG_UPDATE | 6179 SPA_ASYNC_REMOVE); 6180 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 6181 if (spa->spa_ccw_fail_time == 0) { 6182 config_task_suspended = B_FALSE; 6183 } else { 6184 config_task_suspended = 6185 (gethrtime() - spa->spa_ccw_fail_time) < 6186 (zfs_ccw_retry_interval * NANOSEC); 6187 } 6188 6189 return (non_config_tasks || (config_task && !config_task_suspended)); 6190} 6191 6192static void 6193spa_async_dispatch(spa_t *spa) 6194{ 6195 mutex_enter(&spa->spa_async_lock); 6196 if (spa_async_tasks_pending(spa) && 6197 !spa->spa_async_suspended && 6198 spa->spa_async_thread == NULL && 6199 rootdir != NULL) 6200 spa->spa_async_thread = thread_create(NULL, 0, 6201 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 6202 mutex_exit(&spa->spa_async_lock); 6203} 6204 6205static void 6206spa_async_dispatch_vd(spa_t *spa) 6207{ 6208 mutex_enter(&spa->spa_async_lock); 6209 if ((spa->spa_async_tasks & SPA_ASYNC_REMOVE) != 0 && 6210 !spa->spa_async_suspended && 6211 spa->spa_async_thread_vd == NULL && 6212 rootdir != NULL) 6213 spa->spa_async_thread_vd = thread_create(NULL, 0, 6214 spa_async_thread_vd, spa, 0, &p0, TS_RUN, maxclsyspri); 6215 mutex_exit(&spa->spa_async_lock); 6216} 6217 6218void 6219spa_async_request(spa_t *spa, int task) 6220{ 6221 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 6222 mutex_enter(&spa->spa_async_lock); 6223 spa->spa_async_tasks |= task; 6224 mutex_exit(&spa->spa_async_lock); 6225 spa_async_dispatch_vd(spa); 6226} 6227 6228/* 6229 * ========================================================================== 6230 * SPA syncing routines 6231 * ========================================================================== 6232 */ 6233 6234static int 6235bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6236{ 6237 bpobj_t *bpo = arg; 6238 bpobj_enqueue(bpo, bp, tx); 6239 return (0); 6240} 6241 6242static int 6243spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6244{ 6245 zio_t *zio = arg; 6246 6247 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 6248 BP_GET_PSIZE(bp), zio->io_flags)); 6249 return (0); 6250} 6251 6252/* 6253 * Note: this simple function is not inlined to make it easier to dtrace the 6254 * amount of time spent syncing frees. 6255 */ 6256static void 6257spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 6258{ 6259 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6260 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 6261 VERIFY(zio_wait(zio) == 0); 6262} 6263 6264/* 6265 * Note: this simple function is not inlined to make it easier to dtrace the 6266 * amount of time spent syncing deferred frees. 6267 */ 6268static void 6269spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 6270{ 6271 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6272 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 6273 spa_free_sync_cb, zio, tx), ==, 0); 6274 VERIFY0(zio_wait(zio)); 6275} 6276 6277 6278static void 6279spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 6280{ 6281 char *packed = NULL; 6282 size_t bufsize; 6283 size_t nvsize = 0; 6284 dmu_buf_t *db; 6285 6286 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 6287 6288 /* 6289 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 6290 * information. This avoids the dmu_buf_will_dirty() path and 6291 * saves us a pre-read to get data we don't actually care about. 6292 */ 6293 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 6294 packed = kmem_alloc(bufsize, KM_SLEEP); 6295 6296 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 6297 KM_SLEEP) == 0); 6298 bzero(packed + nvsize, bufsize - nvsize); 6299 6300 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 6301 6302 kmem_free(packed, bufsize); 6303 6304 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 6305 dmu_buf_will_dirty(db, tx); 6306 *(uint64_t *)db->db_data = nvsize; 6307 dmu_buf_rele(db, FTAG); 6308} 6309 6310static void 6311spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 6312 const char *config, const char *entry) 6313{ 6314 nvlist_t *nvroot; 6315 nvlist_t **list; 6316 int i; 6317 6318 if (!sav->sav_sync) 6319 return; 6320 6321 /* 6322 * Update the MOS nvlist describing the list of available devices. 6323 * spa_validate_aux() will have already made sure this nvlist is 6324 * valid and the vdevs are labeled appropriately. 6325 */ 6326 if (sav->sav_object == 0) { 6327 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 6328 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 6329 sizeof (uint64_t), tx); 6330 VERIFY(zap_update(spa->spa_meta_objset, 6331 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 6332 &sav->sav_object, tx) == 0); 6333 } 6334 6335 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6336 if (sav->sav_count == 0) { 6337 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 6338 } else { 6339 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 6340 for (i = 0; i < sav->sav_count; i++) 6341 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 6342 B_FALSE, VDEV_CONFIG_L2CACHE); 6343 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 6344 sav->sav_count) == 0); 6345 for (i = 0; i < sav->sav_count; i++) 6346 nvlist_free(list[i]); 6347 kmem_free(list, sav->sav_count * sizeof (void *)); 6348 } 6349 6350 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 6351 nvlist_free(nvroot); 6352 6353 sav->sav_sync = B_FALSE; 6354} 6355 6356static void 6357spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 6358{ 6359 nvlist_t *config; 6360 6361 if (list_is_empty(&spa->spa_config_dirty_list)) 6362 return; 6363 6364 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6365 6366 config = spa_config_generate(spa, spa->spa_root_vdev, 6367 dmu_tx_get_txg(tx), B_FALSE); 6368 6369 /* 6370 * If we're upgrading the spa version then make sure that 6371 * the config object gets updated with the correct version. 6372 */ 6373 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 6374 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6375 spa->spa_uberblock.ub_version); 6376 6377 spa_config_exit(spa, SCL_STATE, FTAG); 6378 6379 nvlist_free(spa->spa_config_syncing); 6380 spa->spa_config_syncing = config; 6381 6382 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 6383} 6384 6385static void 6386spa_sync_version(void *arg, dmu_tx_t *tx) 6387{ 6388 uint64_t *versionp = arg; 6389 uint64_t version = *versionp; 6390 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6391 6392 /* 6393 * Setting the version is special cased when first creating the pool. 6394 */ 6395 ASSERT(tx->tx_txg != TXG_INITIAL); 6396 6397 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 6398 ASSERT(version >= spa_version(spa)); 6399 6400 spa->spa_uberblock.ub_version = version; 6401 vdev_config_dirty(spa->spa_root_vdev); 6402 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 6403} 6404 6405/* 6406 * Set zpool properties. 6407 */ 6408static void 6409spa_sync_props(void *arg, dmu_tx_t *tx) 6410{ 6411 nvlist_t *nvp = arg; 6412 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6413 objset_t *mos = spa->spa_meta_objset; 6414 nvpair_t *elem = NULL; 6415 6416 mutex_enter(&spa->spa_props_lock); 6417 6418 while ((elem = nvlist_next_nvpair(nvp, elem))) { 6419 uint64_t intval; 6420 char *strval, *fname; 6421 zpool_prop_t prop; 6422 const char *propname; 6423 zprop_type_t proptype; 6424 spa_feature_t fid; 6425 6426 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 6427 case ZPROP_INVAL: 6428 /* 6429 * We checked this earlier in spa_prop_validate(). 6430 */ 6431 ASSERT(zpool_prop_feature(nvpair_name(elem))); 6432 6433 fname = strchr(nvpair_name(elem), '@') + 1; 6434 VERIFY0(zfeature_lookup_name(fname, &fid)); 6435 6436 spa_feature_enable(spa, fid, tx); 6437 spa_history_log_internal(spa, "set", tx, 6438 "%s=enabled", nvpair_name(elem)); 6439 break; 6440 6441 case ZPOOL_PROP_VERSION: 6442 intval = fnvpair_value_uint64(elem); 6443 /* 6444 * The version is synced seperatly before other 6445 * properties and should be correct by now. 6446 */ 6447 ASSERT3U(spa_version(spa), >=, intval); 6448 break; 6449 6450 case ZPOOL_PROP_ALTROOT: 6451 /* 6452 * 'altroot' is a non-persistent property. It should 6453 * have been set temporarily at creation or import time. 6454 */ 6455 ASSERT(spa->spa_root != NULL); 6456 break; 6457 6458 case ZPOOL_PROP_READONLY: 6459 case ZPOOL_PROP_CACHEFILE: 6460 /* 6461 * 'readonly' and 'cachefile' are also non-persisitent 6462 * properties. 6463 */ 6464 break; 6465 case ZPOOL_PROP_COMMENT: 6466 strval = fnvpair_value_string(elem); 6467 if (spa->spa_comment != NULL) 6468 spa_strfree(spa->spa_comment); 6469 spa->spa_comment = spa_strdup(strval); 6470 /* 6471 * We need to dirty the configuration on all the vdevs 6472 * so that their labels get updated. It's unnecessary 6473 * to do this for pool creation since the vdev's 6474 * configuratoin has already been dirtied. 6475 */ 6476 if (tx->tx_txg != TXG_INITIAL) 6477 vdev_config_dirty(spa->spa_root_vdev); 6478 spa_history_log_internal(spa, "set", tx, 6479 "%s=%s", nvpair_name(elem), strval); 6480 break; 6481 default: 6482 /* 6483 * Set pool property values in the poolprops mos object. 6484 */ 6485 if (spa->spa_pool_props_object == 0) { 6486 spa->spa_pool_props_object = 6487 zap_create_link(mos, DMU_OT_POOL_PROPS, 6488 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 6489 tx); 6490 } 6491 6492 /* normalize the property name */ 6493 propname = zpool_prop_to_name(prop); 6494 proptype = zpool_prop_get_type(prop); 6495 6496 if (nvpair_type(elem) == DATA_TYPE_STRING) { 6497 ASSERT(proptype == PROP_TYPE_STRING); 6498 strval = fnvpair_value_string(elem); 6499 VERIFY0(zap_update(mos, 6500 spa->spa_pool_props_object, propname, 6501 1, strlen(strval) + 1, strval, tx)); 6502 spa_history_log_internal(spa, "set", tx, 6503 "%s=%s", nvpair_name(elem), strval); 6504 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 6505 intval = fnvpair_value_uint64(elem); 6506 6507 if (proptype == PROP_TYPE_INDEX) { 6508 const char *unused; 6509 VERIFY0(zpool_prop_index_to_string( 6510 prop, intval, &unused)); 6511 } 6512 VERIFY0(zap_update(mos, 6513 spa->spa_pool_props_object, propname, 6514 8, 1, &intval, tx)); 6515 spa_history_log_internal(spa, "set", tx, 6516 "%s=%lld", nvpair_name(elem), intval); 6517 } else { 6518 ASSERT(0); /* not allowed */ 6519 } 6520 6521 switch (prop) { 6522 case ZPOOL_PROP_DELEGATION: 6523 spa->spa_delegation = intval; 6524 break; 6525 case ZPOOL_PROP_BOOTFS: 6526 spa->spa_bootfs = intval; 6527 break; 6528 case ZPOOL_PROP_FAILUREMODE: 6529 spa->spa_failmode = intval; 6530 break; 6531 case ZPOOL_PROP_AUTOEXPAND: 6532 spa->spa_autoexpand = intval; 6533 if (tx->tx_txg != TXG_INITIAL) 6534 spa_async_request(spa, 6535 SPA_ASYNC_AUTOEXPAND); 6536 break; 6537 case ZPOOL_PROP_DEDUPDITTO: 6538 spa->spa_dedup_ditto = intval; 6539 break; 6540 default: 6541 break; 6542 } 6543 } 6544 6545 } 6546 6547 mutex_exit(&spa->spa_props_lock); 6548} 6549 6550/* 6551 * Perform one-time upgrade on-disk changes. spa_version() does not 6552 * reflect the new version this txg, so there must be no changes this 6553 * txg to anything that the upgrade code depends on after it executes. 6554 * Therefore this must be called after dsl_pool_sync() does the sync 6555 * tasks. 6556 */ 6557static void 6558spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 6559{ 6560 dsl_pool_t *dp = spa->spa_dsl_pool; 6561 6562 ASSERT(spa->spa_sync_pass == 1); 6563 6564 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 6565 6566 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 6567 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 6568 dsl_pool_create_origin(dp, tx); 6569 6570 /* Keeping the origin open increases spa_minref */ 6571 spa->spa_minref += 3; 6572 } 6573 6574 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 6575 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 6576 dsl_pool_upgrade_clones(dp, tx); 6577 } 6578 6579 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 6580 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 6581 dsl_pool_upgrade_dir_clones(dp, tx); 6582 6583 /* Keeping the freedir open increases spa_minref */ 6584 spa->spa_minref += 3; 6585 } 6586 6587 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 6588 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6589 spa_feature_create_zap_objects(spa, tx); 6590 } 6591 6592 /* 6593 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 6594 * when possibility to use lz4 compression for metadata was added 6595 * Old pools that have this feature enabled must be upgraded to have 6596 * this feature active 6597 */ 6598 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6599 boolean_t lz4_en = spa_feature_is_enabled(spa, 6600 SPA_FEATURE_LZ4_COMPRESS); 6601 boolean_t lz4_ac = spa_feature_is_active(spa, 6602 SPA_FEATURE_LZ4_COMPRESS); 6603 6604 if (lz4_en && !lz4_ac) 6605 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 6606 } 6607 6608 /* 6609 * If we haven't written the salt, do so now. Note that the 6610 * feature may not be activated yet, but that's fine since 6611 * the presence of this ZAP entry is backwards compatible. 6612 */ 6613 if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 6614 DMU_POOL_CHECKSUM_SALT) == ENOENT) { 6615 VERIFY0(zap_add(spa->spa_meta_objset, 6616 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, 6617 sizeof (spa->spa_cksum_salt.zcs_bytes), 6618 spa->spa_cksum_salt.zcs_bytes, tx)); 6619 } 6620 6621 rrw_exit(&dp->dp_config_rwlock, FTAG); 6622} 6623 6624/* 6625 * Sync the specified transaction group. New blocks may be dirtied as 6626 * part of the process, so we iterate until it converges. 6627 */ 6628void 6629spa_sync(spa_t *spa, uint64_t txg) 6630{ 6631 dsl_pool_t *dp = spa->spa_dsl_pool; 6632 objset_t *mos = spa->spa_meta_objset; 6633 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 6634 vdev_t *rvd = spa->spa_root_vdev; 6635 vdev_t *vd; 6636 dmu_tx_t *tx; 6637 int error; 6638 6639 VERIFY(spa_writeable(spa)); 6640 6641 /* 6642 * Lock out configuration changes. 6643 */ 6644 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6645 6646 spa->spa_syncing_txg = txg; 6647 spa->spa_sync_pass = 0; 6648 6649 /* 6650 * If there are any pending vdev state changes, convert them 6651 * into config changes that go out with this transaction group. 6652 */ 6653 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6654 while (list_head(&spa->spa_state_dirty_list) != NULL) { 6655 /* 6656 * We need the write lock here because, for aux vdevs, 6657 * calling vdev_config_dirty() modifies sav_config. 6658 * This is ugly and will become unnecessary when we 6659 * eliminate the aux vdev wart by integrating all vdevs 6660 * into the root vdev tree. 6661 */ 6662 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6663 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 6664 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 6665 vdev_state_clean(vd); 6666 vdev_config_dirty(vd); 6667 } 6668 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6669 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 6670 } 6671 spa_config_exit(spa, SCL_STATE, FTAG); 6672 6673 tx = dmu_tx_create_assigned(dp, txg); 6674 6675 spa->spa_sync_starttime = gethrtime(); 6676#ifdef illumos 6677 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 6678 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 6679#else /* !illumos */ 6680#ifdef _KERNEL 6681 callout_reset(&spa->spa_deadman_cycid, 6682 hz * spa->spa_deadman_synctime / NANOSEC, spa_deadman, spa); 6683#endif 6684#endif /* illumos */ 6685 6686 /* 6687 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 6688 * set spa_deflate if we have no raid-z vdevs. 6689 */ 6690 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 6691 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 6692 int i; 6693 6694 for (i = 0; i < rvd->vdev_children; i++) { 6695 vd = rvd->vdev_child[i]; 6696 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 6697 break; 6698 } 6699 if (i == rvd->vdev_children) { 6700 spa->spa_deflate = TRUE; 6701 VERIFY(0 == zap_add(spa->spa_meta_objset, 6702 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 6703 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 6704 } 6705 } 6706 6707 /* 6708 * Iterate to convergence. 6709 */ 6710 do { 6711 int pass = ++spa->spa_sync_pass; 6712 6713 spa_sync_config_object(spa, tx); 6714 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 6715 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 6716 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 6717 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 6718 spa_errlog_sync(spa, txg); 6719 dsl_pool_sync(dp, txg); 6720 6721 if (pass < zfs_sync_pass_deferred_free) { 6722 spa_sync_frees(spa, free_bpl, tx); 6723 } else { 6724 /* 6725 * We can not defer frees in pass 1, because 6726 * we sync the deferred frees later in pass 1. 6727 */ 6728 ASSERT3U(pass, >, 1); 6729 bplist_iterate(free_bpl, bpobj_enqueue_cb, 6730 &spa->spa_deferred_bpobj, tx); 6731 } 6732 6733 ddt_sync(spa, txg); 6734 dsl_scan_sync(dp, tx); 6735 6736 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 6737 vdev_sync(vd, txg); 6738 6739 if (pass == 1) { 6740 spa_sync_upgrades(spa, tx); 6741 ASSERT3U(txg, >=, 6742 spa->spa_uberblock.ub_rootbp.blk_birth); 6743 /* 6744 * Note: We need to check if the MOS is dirty 6745 * because we could have marked the MOS dirty 6746 * without updating the uberblock (e.g. if we 6747 * have sync tasks but no dirty user data). We 6748 * need to check the uberblock's rootbp because 6749 * it is updated if we have synced out dirty 6750 * data (though in this case the MOS will most 6751 * likely also be dirty due to second order 6752 * effects, we don't want to rely on that here). 6753 */ 6754 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 6755 !dmu_objset_is_dirty(mos, txg)) { 6756 /* 6757 * Nothing changed on the first pass, 6758 * therefore this TXG is a no-op. Avoid 6759 * syncing deferred frees, so that we 6760 * can keep this TXG as a no-op. 6761 */ 6762 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 6763 txg)); 6764 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6765 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 6766 break; 6767 } 6768 spa_sync_deferred_frees(spa, tx); 6769 } 6770 6771 } while (dmu_objset_is_dirty(mos, txg)); 6772 6773 /* 6774 * Rewrite the vdev configuration (which includes the uberblock) 6775 * to commit the transaction group. 6776 * 6777 * If there are no dirty vdevs, we sync the uberblock to a few 6778 * random top-level vdevs that are known to be visible in the 6779 * config cache (see spa_vdev_add() for a complete description). 6780 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 6781 */ 6782 for (;;) { 6783 /* 6784 * We hold SCL_STATE to prevent vdev open/close/etc. 6785 * while we're attempting to write the vdev labels. 6786 */ 6787 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6788 6789 if (list_is_empty(&spa->spa_config_dirty_list)) { 6790 vdev_t *svd[SPA_DVAS_PER_BP]; 6791 int svdcount = 0; 6792 int children = rvd->vdev_children; 6793 int c0 = spa_get_random(children); 6794 6795 for (int c = 0; c < children; c++) { 6796 vd = rvd->vdev_child[(c0 + c) % children]; 6797 if (vd->vdev_ms_array == 0 || vd->vdev_islog) 6798 continue; 6799 svd[svdcount++] = vd; 6800 if (svdcount == SPA_DVAS_PER_BP) 6801 break; 6802 } 6803 error = vdev_config_sync(svd, svdcount, txg); 6804 } else { 6805 error = vdev_config_sync(rvd->vdev_child, 6806 rvd->vdev_children, txg); 6807 } 6808 6809 if (error == 0) 6810 spa->spa_last_synced_guid = rvd->vdev_guid; 6811 6812 spa_config_exit(spa, SCL_STATE, FTAG); 6813 6814 if (error == 0) 6815 break; 6816 zio_suspend(spa, NULL); 6817 zio_resume_wait(spa); 6818 } 6819 dmu_tx_commit(tx); 6820 6821#ifdef illumos 6822 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 6823#else /* !illumos */ 6824#ifdef _KERNEL 6825 callout_drain(&spa->spa_deadman_cycid); 6826#endif 6827#endif /* illumos */ 6828 6829 /* 6830 * Clear the dirty config list. 6831 */ 6832 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 6833 vdev_config_clean(vd); 6834 6835 /* 6836 * Now that the new config has synced transactionally, 6837 * let it become visible to the config cache. 6838 */ 6839 if (spa->spa_config_syncing != NULL) { 6840 spa_config_set(spa, spa->spa_config_syncing); 6841 spa->spa_config_txg = txg; 6842 spa->spa_config_syncing = NULL; 6843 } 6844 6845 spa->spa_ubsync = spa->spa_uberblock; 6846 6847 dsl_pool_sync_done(dp, txg); 6848 6849 /* 6850 * Update usable space statistics. 6851 */ 6852 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 6853 vdev_sync_done(vd, txg); 6854 6855 spa_update_dspace(spa); 6856 6857 /* 6858 * It had better be the case that we didn't dirty anything 6859 * since vdev_config_sync(). 6860 */ 6861 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 6862 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6863 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 6864 6865 spa->spa_sync_pass = 0; 6866 6867 spa_config_exit(spa, SCL_CONFIG, FTAG); 6868 6869 spa_handle_ignored_writes(spa); 6870 6871 /* 6872 * If any async tasks have been requested, kick them off. 6873 */ 6874 spa_async_dispatch(spa); 6875 spa_async_dispatch_vd(spa); 6876} 6877 6878/* 6879 * Sync all pools. We don't want to hold the namespace lock across these 6880 * operations, so we take a reference on the spa_t and drop the lock during the 6881 * sync. 6882 */ 6883void 6884spa_sync_allpools(void) 6885{ 6886 spa_t *spa = NULL; 6887 mutex_enter(&spa_namespace_lock); 6888 while ((spa = spa_next(spa)) != NULL) { 6889 if (spa_state(spa) != POOL_STATE_ACTIVE || 6890 !spa_writeable(spa) || spa_suspended(spa)) 6891 continue; 6892 spa_open_ref(spa, FTAG); 6893 mutex_exit(&spa_namespace_lock); 6894 txg_wait_synced(spa_get_dsl(spa), 0); 6895 mutex_enter(&spa_namespace_lock); 6896 spa_close(spa, FTAG); 6897 } 6898 mutex_exit(&spa_namespace_lock); 6899} 6900 6901/* 6902 * ========================================================================== 6903 * Miscellaneous routines 6904 * ========================================================================== 6905 */ 6906 6907/* 6908 * Remove all pools in the system. 6909 */ 6910void 6911spa_evict_all(void) 6912{ 6913 spa_t *spa; 6914 6915 /* 6916 * Remove all cached state. All pools should be closed now, 6917 * so every spa in the AVL tree should be unreferenced. 6918 */ 6919 mutex_enter(&spa_namespace_lock); 6920 while ((spa = spa_next(NULL)) != NULL) { 6921 /* 6922 * Stop async tasks. The async thread may need to detach 6923 * a device that's been replaced, which requires grabbing 6924 * spa_namespace_lock, so we must drop it here. 6925 */ 6926 spa_open_ref(spa, FTAG); 6927 mutex_exit(&spa_namespace_lock); 6928 spa_async_suspend(spa); 6929 mutex_enter(&spa_namespace_lock); 6930 spa_close(spa, FTAG); 6931 6932 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 6933 spa_unload(spa); 6934 spa_deactivate(spa); 6935 } 6936 spa_remove(spa); 6937 } 6938 mutex_exit(&spa_namespace_lock); 6939} 6940 6941vdev_t * 6942spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 6943{ 6944 vdev_t *vd; 6945 int i; 6946 6947 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 6948 return (vd); 6949 6950 if (aux) { 6951 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 6952 vd = spa->spa_l2cache.sav_vdevs[i]; 6953 if (vd->vdev_guid == guid) 6954 return (vd); 6955 } 6956 6957 for (i = 0; i < spa->spa_spares.sav_count; i++) { 6958 vd = spa->spa_spares.sav_vdevs[i]; 6959 if (vd->vdev_guid == guid) 6960 return (vd); 6961 } 6962 } 6963 6964 return (NULL); 6965} 6966 6967void 6968spa_upgrade(spa_t *spa, uint64_t version) 6969{ 6970 ASSERT(spa_writeable(spa)); 6971 6972 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6973 6974 /* 6975 * This should only be called for a non-faulted pool, and since a 6976 * future version would result in an unopenable pool, this shouldn't be 6977 * possible. 6978 */ 6979 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 6980 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 6981 6982 spa->spa_uberblock.ub_version = version; 6983 vdev_config_dirty(spa->spa_root_vdev); 6984 6985 spa_config_exit(spa, SCL_ALL, FTAG); 6986 6987 txg_wait_synced(spa_get_dsl(spa), 0); 6988} 6989 6990boolean_t 6991spa_has_spare(spa_t *spa, uint64_t guid) 6992{ 6993 int i; 6994 uint64_t spareguid; 6995 spa_aux_vdev_t *sav = &spa->spa_spares; 6996 6997 for (i = 0; i < sav->sav_count; i++) 6998 if (sav->sav_vdevs[i]->vdev_guid == guid) 6999 return (B_TRUE); 7000 7001 for (i = 0; i < sav->sav_npending; i++) { 7002 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 7003 &spareguid) == 0 && spareguid == guid) 7004 return (B_TRUE); 7005 } 7006 7007 return (B_FALSE); 7008} 7009 7010/* 7011 * Check if a pool has an active shared spare device. 7012 * Note: reference count of an active spare is 2, as a spare and as a replace 7013 */ 7014static boolean_t 7015spa_has_active_shared_spare(spa_t *spa) 7016{ 7017 int i, refcnt; 7018 uint64_t pool; 7019 spa_aux_vdev_t *sav = &spa->spa_spares; 7020 7021 for (i = 0; i < sav->sav_count; i++) { 7022 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 7023 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 7024 refcnt > 2) 7025 return (B_TRUE); 7026 } 7027 7028 return (B_FALSE); 7029} 7030 7031static sysevent_t * 7032spa_event_create(spa_t *spa, vdev_t *vd, const char *name) 7033{ 7034 sysevent_t *ev = NULL; 7035#ifdef _KERNEL 7036 sysevent_attr_list_t *attr = NULL; 7037 sysevent_value_t value; 7038 7039 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 7040 SE_SLEEP); 7041 ASSERT(ev != NULL); 7042 7043 value.value_type = SE_DATA_TYPE_STRING; 7044 value.value.sv_string = spa_name(spa); 7045 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0) 7046 goto done; 7047 7048 value.value_type = SE_DATA_TYPE_UINT64; 7049 value.value.sv_uint64 = spa_guid(spa); 7050 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0) 7051 goto done; 7052 7053 if (vd) { 7054 value.value_type = SE_DATA_TYPE_UINT64; 7055 value.value.sv_uint64 = vd->vdev_guid; 7056 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value, 7057 SE_SLEEP) != 0) 7058 goto done; 7059 7060 if (vd->vdev_path) { 7061 value.value_type = SE_DATA_TYPE_STRING; 7062 value.value.sv_string = vd->vdev_path; 7063 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH, 7064 &value, SE_SLEEP) != 0) 7065 goto done; 7066 } 7067 } 7068 7069 if (sysevent_attach_attributes(ev, attr) != 0) 7070 goto done; 7071 attr = NULL; 7072 7073done: 7074 if (attr) 7075 sysevent_free_attr(attr); 7076 7077#endif 7078 return (ev); 7079} 7080 7081static void 7082spa_event_post(sysevent_t *ev) 7083{ 7084#ifdef _KERNEL 7085 sysevent_id_t eid; 7086 7087 (void) log_sysevent(ev, SE_SLEEP, &eid); 7088 sysevent_free(ev); 7089#endif 7090} 7091 7092/* 7093 * Post a sysevent corresponding to the given event. The 'name' must be one of 7094 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 7095 * filled in from the spa and (optionally) the vdev. This doesn't do anything 7096 * in the userland libzpool, as we don't want consumers to misinterpret ztest 7097 * or zdb as real changes. 7098 */ 7099void 7100spa_event_notify(spa_t *spa, vdev_t *vd, const char *name) 7101{ 7102 spa_event_post(spa_event_create(spa, vd, name)); 7103} 7104