spa.c revision 307052
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 void spa_sync_version(void *arg, dmu_tx_t *tx); 156static void spa_sync_props(void *arg, dmu_tx_t *tx); 157static boolean_t spa_has_active_shared_spare(spa_t *spa); 158static int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config, 159 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 160 char **ereport); 161static void spa_vdev_resilver_done(spa_t *spa); 162 163uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 164#ifdef PSRSET_BIND 165id_t zio_taskq_psrset_bind = PS_NONE; 166#endif 167#ifdef SYSDC 168boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 169#endif 170uint_t zio_taskq_basedc = 80; /* base duty cycle */ 171 172boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 173extern int zfs_sync_pass_deferred_free; 174 175#ifndef illumos 176extern void spa_deadman(void *arg); 177#endif 178 179/* 180 * This (illegal) pool name is used when temporarily importing a spa_t in order 181 * to get the vdev stats associated with the imported devices. 182 */ 183#define TRYIMPORT_NAME "$import" 184 185/* 186 * ========================================================================== 187 * SPA properties routines 188 * ========================================================================== 189 */ 190 191/* 192 * Add a (source=src, propname=propval) list to an nvlist. 193 */ 194static void 195spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 196 uint64_t intval, zprop_source_t src) 197{ 198 const char *propname = zpool_prop_to_name(prop); 199 nvlist_t *propval; 200 201 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 202 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 203 204 if (strval != NULL) 205 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 206 else 207 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 208 209 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 210 nvlist_free(propval); 211} 212 213/* 214 * Get property values from the spa configuration. 215 */ 216static void 217spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 218{ 219 vdev_t *rvd = spa->spa_root_vdev; 220 dsl_pool_t *pool = spa->spa_dsl_pool; 221 uint64_t size, alloc, cap, version; 222 zprop_source_t src = ZPROP_SRC_NONE; 223 spa_config_dirent_t *dp; 224 metaslab_class_t *mc = spa_normal_class(spa); 225 226 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 227 228 if (rvd != NULL) { 229 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 230 size = metaslab_class_get_space(spa_normal_class(spa)); 231 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 232 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 233 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 234 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 235 size - alloc, src); 236 237 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 238 metaslab_class_fragmentation(mc), src); 239 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 240 metaslab_class_expandable_space(mc), src); 241 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 242 (spa_mode(spa) == FREAD), src); 243 244 cap = (size == 0) ? 0 : (alloc * 100 / size); 245 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 246 247 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 248 ddt_get_pool_dedup_ratio(spa), src); 249 250 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 251 rvd->vdev_state, src); 252 253 version = spa_version(spa); 254 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 255 src = ZPROP_SRC_DEFAULT; 256 else 257 src = ZPROP_SRC_LOCAL; 258 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 259 } 260 261 if (pool != NULL) { 262 /* 263 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 264 * when opening pools before this version freedir will be NULL. 265 */ 266 if (pool->dp_free_dir != NULL) { 267 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 268 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 269 src); 270 } else { 271 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 272 NULL, 0, src); 273 } 274 275 if (pool->dp_leak_dir != NULL) { 276 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 277 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 278 src); 279 } else { 280 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 281 NULL, 0, src); 282 } 283 } 284 285 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 286 287 if (spa->spa_comment != NULL) { 288 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 289 0, ZPROP_SRC_LOCAL); 290 } 291 292 if (spa->spa_root != NULL) 293 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 294 0, ZPROP_SRC_LOCAL); 295 296 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 297 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 298 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 299 } else { 300 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 301 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 302 } 303 304 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 305 if (dp->scd_path == NULL) { 306 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 307 "none", 0, ZPROP_SRC_LOCAL); 308 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 309 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 310 dp->scd_path, 0, ZPROP_SRC_LOCAL); 311 } 312 } 313} 314 315/* 316 * Get zpool property values. 317 */ 318int 319spa_prop_get(spa_t *spa, nvlist_t **nvp) 320{ 321 objset_t *mos = spa->spa_meta_objset; 322 zap_cursor_t zc; 323 zap_attribute_t za; 324 int err; 325 326 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 327 328 mutex_enter(&spa->spa_props_lock); 329 330 /* 331 * Get properties from the spa config. 332 */ 333 spa_prop_get_config(spa, nvp); 334 335 /* If no pool property object, no more prop to get. */ 336 if (mos == NULL || spa->spa_pool_props_object == 0) { 337 mutex_exit(&spa->spa_props_lock); 338 return (0); 339 } 340 341 /* 342 * Get properties from the MOS pool property object. 343 */ 344 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 345 (err = zap_cursor_retrieve(&zc, &za)) == 0; 346 zap_cursor_advance(&zc)) { 347 uint64_t intval = 0; 348 char *strval = NULL; 349 zprop_source_t src = ZPROP_SRC_DEFAULT; 350 zpool_prop_t prop; 351 352 if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL) 353 continue; 354 355 switch (za.za_integer_length) { 356 case 8: 357 /* integer property */ 358 if (za.za_first_integer != 359 zpool_prop_default_numeric(prop)) 360 src = ZPROP_SRC_LOCAL; 361 362 if (prop == ZPOOL_PROP_BOOTFS) { 363 dsl_pool_t *dp; 364 dsl_dataset_t *ds = NULL; 365 366 dp = spa_get_dsl(spa); 367 dsl_pool_config_enter(dp, FTAG); 368 if (err = dsl_dataset_hold_obj(dp, 369 za.za_first_integer, FTAG, &ds)) { 370 dsl_pool_config_exit(dp, FTAG); 371 break; 372 } 373 374 strval = kmem_alloc( 375 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1, 376 KM_SLEEP); 377 dsl_dataset_name(ds, strval); 378 dsl_dataset_rele(ds, FTAG); 379 dsl_pool_config_exit(dp, FTAG); 380 } else { 381 strval = NULL; 382 intval = za.za_first_integer; 383 } 384 385 spa_prop_add_list(*nvp, prop, strval, intval, src); 386 387 if (strval != NULL) 388 kmem_free(strval, 389 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1); 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 char namebuf[MAXPATHLEN]; 1983 dsl_dataset_name(ds, namebuf); 1984 if (strlen(namebuf) > MAXNAMELEN) { 1985 return (SET_ERROR(ENAMETOOLONG)); 1986 } 1987 1988 return (0); 1989} 1990 1991static int 1992spa_load_verify(spa_t *spa) 1993{ 1994 zio_t *rio; 1995 spa_load_error_t sle = { 0 }; 1996 zpool_rewind_policy_t policy; 1997 boolean_t verify_ok = B_FALSE; 1998 int error = 0; 1999 2000 zpool_get_rewind_policy(spa->spa_config, &policy); 2001 2002 if (policy.zrp_request & ZPOOL_NEVER_REWIND) 2003 return (0); 2004 2005 dsl_pool_config_enter(spa->spa_dsl_pool, FTAG); 2006 error = dmu_objset_find_dp(spa->spa_dsl_pool, 2007 spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL, 2008 DS_FIND_CHILDREN); 2009 dsl_pool_config_exit(spa->spa_dsl_pool, FTAG); 2010 if (error != 0) 2011 return (error); 2012 2013 rio = zio_root(spa, NULL, &sle, 2014 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 2015 2016 if (spa_load_verify_metadata) { 2017 error = traverse_pool(spa, spa->spa_verify_min_txg, 2018 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 2019 spa_load_verify_cb, rio); 2020 } 2021 2022 (void) zio_wait(rio); 2023 2024 spa->spa_load_meta_errors = sle.sle_meta_count; 2025 spa->spa_load_data_errors = sle.sle_data_count; 2026 2027 if (!error && sle.sle_meta_count <= policy.zrp_maxmeta && 2028 sle.sle_data_count <= policy.zrp_maxdata) { 2029 int64_t loss = 0; 2030 2031 verify_ok = B_TRUE; 2032 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 2033 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 2034 2035 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 2036 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2037 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 2038 VERIFY(nvlist_add_int64(spa->spa_load_info, 2039 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 2040 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2041 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 2042 } else { 2043 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 2044 } 2045 2046 if (error) { 2047 if (error != ENXIO && error != EIO) 2048 error = SET_ERROR(EIO); 2049 return (error); 2050 } 2051 2052 return (verify_ok ? 0 : EIO); 2053} 2054 2055/* 2056 * Find a value in the pool props object. 2057 */ 2058static void 2059spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2060{ 2061 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2062 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2063} 2064 2065/* 2066 * Find a value in the pool directory object. 2067 */ 2068static int 2069spa_dir_prop(spa_t *spa, const char *name, uint64_t *val) 2070{ 2071 return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2072 name, sizeof (uint64_t), 1, val)); 2073} 2074 2075static int 2076spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2077{ 2078 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2079 return (err); 2080} 2081 2082/* 2083 * Fix up config after a partly-completed split. This is done with the 2084 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2085 * pool have that entry in their config, but only the splitting one contains 2086 * a list of all the guids of the vdevs that are being split off. 2087 * 2088 * This function determines what to do with that list: either rejoin 2089 * all the disks to the pool, or complete the splitting process. To attempt 2090 * the rejoin, each disk that is offlined is marked online again, and 2091 * we do a reopen() call. If the vdev label for every disk that was 2092 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2093 * then we call vdev_split() on each disk, and complete the split. 2094 * 2095 * Otherwise we leave the config alone, with all the vdevs in place in 2096 * the original pool. 2097 */ 2098static void 2099spa_try_repair(spa_t *spa, nvlist_t *config) 2100{ 2101 uint_t extracted; 2102 uint64_t *glist; 2103 uint_t i, gcount; 2104 nvlist_t *nvl; 2105 vdev_t **vd; 2106 boolean_t attempt_reopen; 2107 2108 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2109 return; 2110 2111 /* check that the config is complete */ 2112 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2113 &glist, &gcount) != 0) 2114 return; 2115 2116 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2117 2118 /* attempt to online all the vdevs & validate */ 2119 attempt_reopen = B_TRUE; 2120 for (i = 0; i < gcount; i++) { 2121 if (glist[i] == 0) /* vdev is hole */ 2122 continue; 2123 2124 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2125 if (vd[i] == NULL) { 2126 /* 2127 * Don't bother attempting to reopen the disks; 2128 * just do the split. 2129 */ 2130 attempt_reopen = B_FALSE; 2131 } else { 2132 /* attempt to re-online it */ 2133 vd[i]->vdev_offline = B_FALSE; 2134 } 2135 } 2136 2137 if (attempt_reopen) { 2138 vdev_reopen(spa->spa_root_vdev); 2139 2140 /* check each device to see what state it's in */ 2141 for (extracted = 0, i = 0; i < gcount; i++) { 2142 if (vd[i] != NULL && 2143 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2144 break; 2145 ++extracted; 2146 } 2147 } 2148 2149 /* 2150 * If every disk has been moved to the new pool, or if we never 2151 * even attempted to look at them, then we split them off for 2152 * good. 2153 */ 2154 if (!attempt_reopen || gcount == extracted) { 2155 for (i = 0; i < gcount; i++) 2156 if (vd[i] != NULL) 2157 vdev_split(vd[i]); 2158 vdev_reopen(spa->spa_root_vdev); 2159 } 2160 2161 kmem_free(vd, gcount * sizeof (vdev_t *)); 2162} 2163 2164static int 2165spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type, 2166 boolean_t mosconfig) 2167{ 2168 nvlist_t *config = spa->spa_config; 2169 char *ereport = FM_EREPORT_ZFS_POOL; 2170 char *comment; 2171 int error; 2172 uint64_t pool_guid; 2173 nvlist_t *nvl; 2174 2175 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) 2176 return (SET_ERROR(EINVAL)); 2177 2178 ASSERT(spa->spa_comment == NULL); 2179 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2180 spa->spa_comment = spa_strdup(comment); 2181 2182 /* 2183 * Versioning wasn't explicitly added to the label until later, so if 2184 * it's not present treat it as the initial version. 2185 */ 2186 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2187 &spa->spa_ubsync.ub_version) != 0) 2188 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2189 2190 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2191 &spa->spa_config_txg); 2192 2193 if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) && 2194 spa_guid_exists(pool_guid, 0)) { 2195 error = SET_ERROR(EEXIST); 2196 } else { 2197 spa->spa_config_guid = pool_guid; 2198 2199 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, 2200 &nvl) == 0) { 2201 VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting, 2202 KM_SLEEP) == 0); 2203 } 2204 2205 nvlist_free(spa->spa_load_info); 2206 spa->spa_load_info = fnvlist_alloc(); 2207 2208 gethrestime(&spa->spa_loaded_ts); 2209 error = spa_load_impl(spa, pool_guid, config, state, type, 2210 mosconfig, &ereport); 2211 } 2212 2213 /* 2214 * Don't count references from objsets that are already closed 2215 * and are making their way through the eviction process. 2216 */ 2217 spa_evicting_os_wait(spa); 2218 spa->spa_minref = refcount_count(&spa->spa_refcount); 2219 if (error) { 2220 if (error != EEXIST) { 2221 spa->spa_loaded_ts.tv_sec = 0; 2222 spa->spa_loaded_ts.tv_nsec = 0; 2223 } 2224 if (error != EBADF) { 2225 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2226 } 2227 } 2228 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2229 spa->spa_ena = 0; 2230 2231 return (error); 2232} 2233 2234/* 2235 * Load an existing storage pool, using the pool's builtin spa_config as a 2236 * source of configuration information. 2237 */ 2238static int 2239spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config, 2240 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 2241 char **ereport) 2242{ 2243 int error = 0; 2244 nvlist_t *nvroot = NULL; 2245 nvlist_t *label; 2246 vdev_t *rvd; 2247 uberblock_t *ub = &spa->spa_uberblock; 2248 uint64_t children, config_cache_txg = spa->spa_config_txg; 2249 int orig_mode = spa->spa_mode; 2250 int parse; 2251 uint64_t obj; 2252 boolean_t missing_feat_write = B_FALSE; 2253 2254 /* 2255 * If this is an untrusted config, access the pool in read-only mode. 2256 * This prevents things like resilvering recently removed devices. 2257 */ 2258 if (!mosconfig) 2259 spa->spa_mode = FREAD; 2260 2261 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2262 2263 spa->spa_load_state = state; 2264 2265 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot)) 2266 return (SET_ERROR(EINVAL)); 2267 2268 parse = (type == SPA_IMPORT_EXISTING ? 2269 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2270 2271 /* 2272 * Create "The Godfather" zio to hold all async IOs 2273 */ 2274 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2275 KM_SLEEP); 2276 for (int i = 0; i < max_ncpus; i++) { 2277 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2278 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2279 ZIO_FLAG_GODFATHER); 2280 } 2281 2282 /* 2283 * Parse the configuration into a vdev tree. We explicitly set the 2284 * value that will be returned by spa_version() since parsing the 2285 * configuration requires knowing the version number. 2286 */ 2287 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2288 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse); 2289 spa_config_exit(spa, SCL_ALL, FTAG); 2290 2291 if (error != 0) 2292 return (error); 2293 2294 ASSERT(spa->spa_root_vdev == rvd); 2295 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2296 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2297 2298 if (type != SPA_IMPORT_ASSEMBLE) { 2299 ASSERT(spa_guid(spa) == pool_guid); 2300 } 2301 2302 /* 2303 * Try to open all vdevs, loading each label in the process. 2304 */ 2305 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2306 error = vdev_open(rvd); 2307 spa_config_exit(spa, SCL_ALL, FTAG); 2308 if (error != 0) 2309 return (error); 2310 2311 /* 2312 * We need to validate the vdev labels against the configuration that 2313 * we have in hand, which is dependent on the setting of mosconfig. If 2314 * mosconfig is true then we're validating the vdev labels based on 2315 * that config. Otherwise, we're validating against the cached config 2316 * (zpool.cache) that was read when we loaded the zfs module, and then 2317 * later we will recursively call spa_load() and validate against 2318 * the vdev config. 2319 * 2320 * If we're assembling a new pool that's been split off from an 2321 * existing pool, the labels haven't yet been updated so we skip 2322 * validation for now. 2323 */ 2324 if (type != SPA_IMPORT_ASSEMBLE) { 2325 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2326 error = vdev_validate(rvd, mosconfig); 2327 spa_config_exit(spa, SCL_ALL, FTAG); 2328 2329 if (error != 0) 2330 return (error); 2331 2332 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2333 return (SET_ERROR(ENXIO)); 2334 } 2335 2336 /* 2337 * Find the best uberblock. 2338 */ 2339 vdev_uberblock_load(rvd, ub, &label); 2340 2341 /* 2342 * If we weren't able to find a single valid uberblock, return failure. 2343 */ 2344 if (ub->ub_txg == 0) { 2345 nvlist_free(label); 2346 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2347 } 2348 2349 /* 2350 * If the pool has an unsupported version we can't open it. 2351 */ 2352 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2353 nvlist_free(label); 2354 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2355 } 2356 2357 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2358 nvlist_t *features; 2359 2360 /* 2361 * If we weren't able to find what's necessary for reading the 2362 * MOS in the label, return failure. 2363 */ 2364 if (label == NULL || nvlist_lookup_nvlist(label, 2365 ZPOOL_CONFIG_FEATURES_FOR_READ, &features) != 0) { 2366 nvlist_free(label); 2367 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2368 ENXIO)); 2369 } 2370 2371 /* 2372 * Update our in-core representation with the definitive values 2373 * from the label. 2374 */ 2375 nvlist_free(spa->spa_label_features); 2376 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2377 } 2378 2379 nvlist_free(label); 2380 2381 /* 2382 * Look through entries in the label nvlist's features_for_read. If 2383 * there is a feature listed there which we don't understand then we 2384 * cannot open a pool. 2385 */ 2386 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2387 nvlist_t *unsup_feat; 2388 2389 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2390 0); 2391 2392 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2393 NULL); nvp != NULL; 2394 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2395 if (!zfeature_is_supported(nvpair_name(nvp))) { 2396 VERIFY(nvlist_add_string(unsup_feat, 2397 nvpair_name(nvp), "") == 0); 2398 } 2399 } 2400 2401 if (!nvlist_empty(unsup_feat)) { 2402 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2403 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2404 nvlist_free(unsup_feat); 2405 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2406 ENOTSUP)); 2407 } 2408 2409 nvlist_free(unsup_feat); 2410 } 2411 2412 /* 2413 * If the vdev guid sum doesn't match the uberblock, we have an 2414 * incomplete configuration. We first check to see if the pool 2415 * is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN). 2416 * If it is, defer the vdev_guid_sum check till later so we 2417 * can handle missing vdevs. 2418 */ 2419 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, 2420 &children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE && 2421 rvd->vdev_guid_sum != ub->ub_guid_sum) 2422 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2423 2424 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2425 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2426 spa_try_repair(spa, config); 2427 spa_config_exit(spa, SCL_ALL, FTAG); 2428 nvlist_free(spa->spa_config_splitting); 2429 spa->spa_config_splitting = NULL; 2430 } 2431 2432 /* 2433 * Initialize internal SPA structures. 2434 */ 2435 spa->spa_state = POOL_STATE_ACTIVE; 2436 spa->spa_ubsync = spa->spa_uberblock; 2437 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2438 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2439 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2440 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2441 spa->spa_claim_max_txg = spa->spa_first_txg; 2442 spa->spa_prev_software_version = ub->ub_software_version; 2443 2444 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2445 if (error) 2446 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2447 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2448 2449 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0) 2450 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2451 2452 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2453 boolean_t missing_feat_read = B_FALSE; 2454 nvlist_t *unsup_feat, *enabled_feat; 2455 2456 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2457 &spa->spa_feat_for_read_obj) != 0) { 2458 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2459 } 2460 2461 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2462 &spa->spa_feat_for_write_obj) != 0) { 2463 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2464 } 2465 2466 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 2467 &spa->spa_feat_desc_obj) != 0) { 2468 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2469 } 2470 2471 enabled_feat = fnvlist_alloc(); 2472 unsup_feat = fnvlist_alloc(); 2473 2474 if (!spa_features_check(spa, B_FALSE, 2475 unsup_feat, enabled_feat)) 2476 missing_feat_read = B_TRUE; 2477 2478 if (spa_writeable(spa) || state == SPA_LOAD_TRYIMPORT) { 2479 if (!spa_features_check(spa, B_TRUE, 2480 unsup_feat, enabled_feat)) { 2481 missing_feat_write = B_TRUE; 2482 } 2483 } 2484 2485 fnvlist_add_nvlist(spa->spa_load_info, 2486 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 2487 2488 if (!nvlist_empty(unsup_feat)) { 2489 fnvlist_add_nvlist(spa->spa_load_info, 2490 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 2491 } 2492 2493 fnvlist_free(enabled_feat); 2494 fnvlist_free(unsup_feat); 2495 2496 if (!missing_feat_read) { 2497 fnvlist_add_boolean(spa->spa_load_info, 2498 ZPOOL_CONFIG_CAN_RDONLY); 2499 } 2500 2501 /* 2502 * If the state is SPA_LOAD_TRYIMPORT, our objective is 2503 * twofold: to determine whether the pool is available for 2504 * import in read-write mode and (if it is not) whether the 2505 * pool is available for import in read-only mode. If the pool 2506 * is available for import in read-write mode, it is displayed 2507 * as available in userland; if it is not available for import 2508 * in read-only mode, it is displayed as unavailable in 2509 * userland. If the pool is available for import in read-only 2510 * mode but not read-write mode, it is displayed as unavailable 2511 * in userland with a special note that the pool is actually 2512 * available for open in read-only mode. 2513 * 2514 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 2515 * missing a feature for write, we must first determine whether 2516 * the pool can be opened read-only before returning to 2517 * userland in order to know whether to display the 2518 * abovementioned note. 2519 */ 2520 if (missing_feat_read || (missing_feat_write && 2521 spa_writeable(spa))) { 2522 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2523 ENOTSUP)); 2524 } 2525 2526 /* 2527 * Load refcounts for ZFS features from disk into an in-memory 2528 * cache during SPA initialization. 2529 */ 2530 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 2531 uint64_t refcount; 2532 2533 error = feature_get_refcount_from_disk(spa, 2534 &spa_feature_table[i], &refcount); 2535 if (error == 0) { 2536 spa->spa_feat_refcount_cache[i] = refcount; 2537 } else if (error == ENOTSUP) { 2538 spa->spa_feat_refcount_cache[i] = 2539 SPA_FEATURE_DISABLED; 2540 } else { 2541 return (spa_vdev_err(rvd, 2542 VDEV_AUX_CORRUPT_DATA, EIO)); 2543 } 2544 } 2545 } 2546 2547 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 2548 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 2549 &spa->spa_feat_enabled_txg_obj) != 0) 2550 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2551 } 2552 2553 spa->spa_is_initializing = B_TRUE; 2554 error = dsl_pool_open(spa->spa_dsl_pool); 2555 spa->spa_is_initializing = B_FALSE; 2556 if (error != 0) 2557 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2558 2559 if (!mosconfig) { 2560 uint64_t hostid; 2561 nvlist_t *policy = NULL, *nvconfig; 2562 2563 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2564 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2565 2566 if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig, 2567 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2568 char *hostname; 2569 unsigned long myhostid = 0; 2570 2571 VERIFY(nvlist_lookup_string(nvconfig, 2572 ZPOOL_CONFIG_HOSTNAME, &hostname) == 0); 2573 2574#ifdef _KERNEL 2575 myhostid = zone_get_hostid(NULL); 2576#else /* _KERNEL */ 2577 /* 2578 * We're emulating the system's hostid in userland, so 2579 * we can't use zone_get_hostid(). 2580 */ 2581 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid); 2582#endif /* _KERNEL */ 2583 if (check_hostid && hostid != 0 && myhostid != 0 && 2584 hostid != myhostid) { 2585 nvlist_free(nvconfig); 2586 cmn_err(CE_WARN, "pool '%s' could not be " 2587 "loaded as it was last accessed by " 2588 "another system (host: %s hostid: 0x%lx). " 2589 "See: http://illumos.org/msg/ZFS-8000-EY", 2590 spa_name(spa), hostname, 2591 (unsigned long)hostid); 2592 return (SET_ERROR(EBADF)); 2593 } 2594 } 2595 if (nvlist_lookup_nvlist(spa->spa_config, 2596 ZPOOL_REWIND_POLICY, &policy) == 0) 2597 VERIFY(nvlist_add_nvlist(nvconfig, 2598 ZPOOL_REWIND_POLICY, policy) == 0); 2599 2600 spa_config_set(spa, nvconfig); 2601 spa_unload(spa); 2602 spa_deactivate(spa); 2603 spa_activate(spa, orig_mode); 2604 2605 return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE)); 2606 } 2607 2608 /* Grab the secret checksum salt from the MOS. */ 2609 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2610 DMU_POOL_CHECKSUM_SALT, 1, 2611 sizeof (spa->spa_cksum_salt.zcs_bytes), 2612 spa->spa_cksum_salt.zcs_bytes); 2613 if (error == ENOENT) { 2614 /* Generate a new salt for subsequent use */ 2615 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 2616 sizeof (spa->spa_cksum_salt.zcs_bytes)); 2617 } else if (error != 0) { 2618 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2619 } 2620 2621 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0) 2622 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2623 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 2624 if (error != 0) 2625 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2626 2627 /* 2628 * Load the bit that tells us to use the new accounting function 2629 * (raid-z deflation). If we have an older pool, this will not 2630 * be present. 2631 */ 2632 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate); 2633 if (error != 0 && error != ENOENT) 2634 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2635 2636 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 2637 &spa->spa_creation_version); 2638 if (error != 0 && error != ENOENT) 2639 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2640 2641 /* 2642 * Load the persistent error log. If we have an older pool, this will 2643 * not be present. 2644 */ 2645 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last); 2646 if (error != 0 && error != ENOENT) 2647 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2648 2649 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 2650 &spa->spa_errlog_scrub); 2651 if (error != 0 && error != ENOENT) 2652 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2653 2654 /* 2655 * Load the history object. If we have an older pool, this 2656 * will not be present. 2657 */ 2658 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history); 2659 if (error != 0 && error != ENOENT) 2660 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2661 2662 /* 2663 * If we're assembling the pool from the split-off vdevs of 2664 * an existing pool, we don't want to attach the spares & cache 2665 * devices. 2666 */ 2667 2668 /* 2669 * Load any hot spares for this pool. 2670 */ 2671 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object); 2672 if (error != 0 && error != ENOENT) 2673 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2674 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2675 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 2676 if (load_nvlist(spa, spa->spa_spares.sav_object, 2677 &spa->spa_spares.sav_config) != 0) 2678 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2679 2680 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2681 spa_load_spares(spa); 2682 spa_config_exit(spa, SCL_ALL, FTAG); 2683 } else if (error == 0) { 2684 spa->spa_spares.sav_sync = B_TRUE; 2685 } 2686 2687 /* 2688 * Load any level 2 ARC devices for this pool. 2689 */ 2690 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 2691 &spa->spa_l2cache.sav_object); 2692 if (error != 0 && error != ENOENT) 2693 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2694 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2695 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 2696 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 2697 &spa->spa_l2cache.sav_config) != 0) 2698 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2699 2700 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2701 spa_load_l2cache(spa); 2702 spa_config_exit(spa, SCL_ALL, FTAG); 2703 } else if (error == 0) { 2704 spa->spa_l2cache.sav_sync = B_TRUE; 2705 } 2706 2707 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 2708 2709 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object); 2710 if (error && error != ENOENT) 2711 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2712 2713 if (error == 0) { 2714 uint64_t autoreplace; 2715 2716 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 2717 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 2718 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 2719 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 2720 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 2721 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 2722 &spa->spa_dedup_ditto); 2723 2724 spa->spa_autoreplace = (autoreplace != 0); 2725 } 2726 2727 /* 2728 * If the 'autoreplace' property is set, then post a resource notifying 2729 * the ZFS DE that it should not issue any faults for unopenable 2730 * devices. We also iterate over the vdevs, and post a sysevent for any 2731 * unopenable vdevs so that the normal autoreplace handler can take 2732 * over. 2733 */ 2734 if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) { 2735 spa_check_removed(spa->spa_root_vdev); 2736 /* 2737 * For the import case, this is done in spa_import(), because 2738 * at this point we're using the spare definitions from 2739 * the MOS config, not necessarily from the userland config. 2740 */ 2741 if (state != SPA_LOAD_IMPORT) { 2742 spa_aux_check_removed(&spa->spa_spares); 2743 spa_aux_check_removed(&spa->spa_l2cache); 2744 } 2745 } 2746 2747 /* 2748 * Load the vdev state for all toplevel vdevs. 2749 */ 2750 vdev_load(rvd); 2751 2752 /* 2753 * Propagate the leaf DTLs we just loaded all the way up the tree. 2754 */ 2755 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2756 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 2757 spa_config_exit(spa, SCL_ALL, FTAG); 2758 2759 /* 2760 * Load the DDTs (dedup tables). 2761 */ 2762 error = ddt_load(spa); 2763 if (error != 0) 2764 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2765 2766 spa_update_dspace(spa); 2767 2768 /* 2769 * Validate the config, using the MOS config to fill in any 2770 * information which might be missing. If we fail to validate 2771 * the config then declare the pool unfit for use. If we're 2772 * assembling a pool from a split, the log is not transferred 2773 * over. 2774 */ 2775 if (type != SPA_IMPORT_ASSEMBLE) { 2776 nvlist_t *nvconfig; 2777 2778 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2779 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2780 2781 if (!spa_config_valid(spa, nvconfig)) { 2782 nvlist_free(nvconfig); 2783 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2784 ENXIO)); 2785 } 2786 nvlist_free(nvconfig); 2787 2788 /* 2789 * Now that we've validated the config, check the state of the 2790 * root vdev. If it can't be opened, it indicates one or 2791 * more toplevel vdevs are faulted. 2792 */ 2793 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2794 return (SET_ERROR(ENXIO)); 2795 2796 if (spa_writeable(spa) && spa_check_logs(spa)) { 2797 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 2798 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO)); 2799 } 2800 } 2801 2802 if (missing_feat_write) { 2803 ASSERT(state == SPA_LOAD_TRYIMPORT); 2804 2805 /* 2806 * At this point, we know that we can open the pool in 2807 * read-only mode but not read-write mode. We now have enough 2808 * information and can return to userland. 2809 */ 2810 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, ENOTSUP)); 2811 } 2812 2813 /* 2814 * We've successfully opened the pool, verify that we're ready 2815 * to start pushing transactions. 2816 */ 2817 if (state != SPA_LOAD_TRYIMPORT) { 2818 if (error = spa_load_verify(spa)) 2819 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2820 error)); 2821 } 2822 2823 if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER || 2824 spa->spa_load_max_txg == UINT64_MAX)) { 2825 dmu_tx_t *tx; 2826 int need_update = B_FALSE; 2827 dsl_pool_t *dp = spa_get_dsl(spa); 2828 2829 ASSERT(state != SPA_LOAD_TRYIMPORT); 2830 2831 /* 2832 * Claim log blocks that haven't been committed yet. 2833 * This must all happen in a single txg. 2834 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 2835 * invoked from zil_claim_log_block()'s i/o done callback. 2836 * Price of rollback is that we abandon the log. 2837 */ 2838 spa->spa_claiming = B_TRUE; 2839 2840 tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); 2841 (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 2842 zil_claim, tx, DS_FIND_CHILDREN); 2843 dmu_tx_commit(tx); 2844 2845 spa->spa_claiming = B_FALSE; 2846 2847 spa_set_log_state(spa, SPA_LOG_GOOD); 2848 spa->spa_sync_on = B_TRUE; 2849 txg_sync_start(spa->spa_dsl_pool); 2850 2851 /* 2852 * Wait for all claims to sync. We sync up to the highest 2853 * claimed log block birth time so that claimed log blocks 2854 * don't appear to be from the future. spa_claim_max_txg 2855 * will have been set for us by either zil_check_log_chain() 2856 * (invoked from spa_check_logs()) or zil_claim() above. 2857 */ 2858 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 2859 2860 /* 2861 * If the config cache is stale, or we have uninitialized 2862 * metaslabs (see spa_vdev_add()), then update the config. 2863 * 2864 * If this is a verbatim import, trust the current 2865 * in-core spa_config and update the disk labels. 2866 */ 2867 if (config_cache_txg != spa->spa_config_txg || 2868 state == SPA_LOAD_IMPORT || 2869 state == SPA_LOAD_RECOVER || 2870 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 2871 need_update = B_TRUE; 2872 2873 for (int c = 0; c < rvd->vdev_children; c++) 2874 if (rvd->vdev_child[c]->vdev_ms_array == 0) 2875 need_update = B_TRUE; 2876 2877 /* 2878 * Update the config cache asychronously in case we're the 2879 * root pool, in which case the config cache isn't writable yet. 2880 */ 2881 if (need_update) 2882 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2883 2884 /* 2885 * Check all DTLs to see if anything needs resilvering. 2886 */ 2887 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 2888 vdev_resilver_needed(rvd, NULL, NULL)) 2889 spa_async_request(spa, SPA_ASYNC_RESILVER); 2890 2891 /* 2892 * Log the fact that we booted up (so that we can detect if 2893 * we rebooted in the middle of an operation). 2894 */ 2895 spa_history_log_version(spa, "open"); 2896 2897 /* 2898 * Delete any inconsistent datasets. 2899 */ 2900 (void) dmu_objset_find(spa_name(spa), 2901 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 2902 2903 /* 2904 * Clean up any stale temporary dataset userrefs. 2905 */ 2906 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 2907 } 2908 2909 return (0); 2910} 2911 2912static int 2913spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig) 2914{ 2915 int mode = spa->spa_mode; 2916 2917 spa_unload(spa); 2918 spa_deactivate(spa); 2919 2920 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 2921 2922 spa_activate(spa, mode); 2923 spa_async_suspend(spa); 2924 2925 return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig)); 2926} 2927 2928/* 2929 * If spa_load() fails this function will try loading prior txg's. If 2930 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 2931 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 2932 * function will not rewind the pool and will return the same error as 2933 * spa_load(). 2934 */ 2935static int 2936spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig, 2937 uint64_t max_request, int rewind_flags) 2938{ 2939 nvlist_t *loadinfo = NULL; 2940 nvlist_t *config = NULL; 2941 int load_error, rewind_error; 2942 uint64_t safe_rewind_txg; 2943 uint64_t min_txg; 2944 2945 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 2946 spa->spa_load_max_txg = spa->spa_load_txg; 2947 spa_set_log_state(spa, SPA_LOG_CLEAR); 2948 } else { 2949 spa->spa_load_max_txg = max_request; 2950 if (max_request != UINT64_MAX) 2951 spa->spa_extreme_rewind = B_TRUE; 2952 } 2953 2954 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING, 2955 mosconfig); 2956 if (load_error == 0) 2957 return (0); 2958 2959 if (spa->spa_root_vdev != NULL) 2960 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 2961 2962 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 2963 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 2964 2965 if (rewind_flags & ZPOOL_NEVER_REWIND) { 2966 nvlist_free(config); 2967 return (load_error); 2968 } 2969 2970 if (state == SPA_LOAD_RECOVER) { 2971 /* Price of rolling back is discarding txgs, including log */ 2972 spa_set_log_state(spa, SPA_LOG_CLEAR); 2973 } else { 2974 /* 2975 * If we aren't rolling back save the load info from our first 2976 * import attempt so that we can restore it after attempting 2977 * to rewind. 2978 */ 2979 loadinfo = spa->spa_load_info; 2980 spa->spa_load_info = fnvlist_alloc(); 2981 } 2982 2983 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 2984 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 2985 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 2986 TXG_INITIAL : safe_rewind_txg; 2987 2988 /* 2989 * Continue as long as we're finding errors, we're still within 2990 * the acceptable rewind range, and we're still finding uberblocks 2991 */ 2992 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 2993 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 2994 if (spa->spa_load_max_txg < safe_rewind_txg) 2995 spa->spa_extreme_rewind = B_TRUE; 2996 rewind_error = spa_load_retry(spa, state, mosconfig); 2997 } 2998 2999 spa->spa_extreme_rewind = B_FALSE; 3000 spa->spa_load_max_txg = UINT64_MAX; 3001 3002 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 3003 spa_config_set(spa, config); 3004 3005 if (state == SPA_LOAD_RECOVER) { 3006 ASSERT3P(loadinfo, ==, NULL); 3007 return (rewind_error); 3008 } else { 3009 /* Store the rewind info as part of the initial load info */ 3010 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 3011 spa->spa_load_info); 3012 3013 /* Restore the initial load info */ 3014 fnvlist_free(spa->spa_load_info); 3015 spa->spa_load_info = loadinfo; 3016 3017 return (load_error); 3018 } 3019} 3020 3021/* 3022 * Pool Open/Import 3023 * 3024 * The import case is identical to an open except that the configuration is sent 3025 * down from userland, instead of grabbed from the configuration cache. For the 3026 * case of an open, the pool configuration will exist in the 3027 * POOL_STATE_UNINITIALIZED state. 3028 * 3029 * The stats information (gen/count/ustats) is used to gather vdev statistics at 3030 * the same time open the pool, without having to keep around the spa_t in some 3031 * ambiguous state. 3032 */ 3033static int 3034spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 3035 nvlist_t **config) 3036{ 3037 spa_t *spa; 3038 spa_load_state_t state = SPA_LOAD_OPEN; 3039 int error; 3040 int locked = B_FALSE; 3041 int firstopen = B_FALSE; 3042 3043 *spapp = NULL; 3044 3045 /* 3046 * As disgusting as this is, we need to support recursive calls to this 3047 * function because dsl_dir_open() is called during spa_load(), and ends 3048 * up calling spa_open() again. The real fix is to figure out how to 3049 * avoid dsl_dir_open() calling this in the first place. 3050 */ 3051 if (mutex_owner(&spa_namespace_lock) != curthread) { 3052 mutex_enter(&spa_namespace_lock); 3053 locked = B_TRUE; 3054 } 3055 3056 if ((spa = spa_lookup(pool)) == NULL) { 3057 if (locked) 3058 mutex_exit(&spa_namespace_lock); 3059 return (SET_ERROR(ENOENT)); 3060 } 3061 3062 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 3063 zpool_rewind_policy_t policy; 3064 3065 firstopen = B_TRUE; 3066 3067 zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config, 3068 &policy); 3069 if (policy.zrp_request & ZPOOL_DO_REWIND) 3070 state = SPA_LOAD_RECOVER; 3071 3072 spa_activate(spa, spa_mode_global); 3073 3074 if (state != SPA_LOAD_RECOVER) 3075 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 3076 3077 error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg, 3078 policy.zrp_request); 3079 3080 if (error == EBADF) { 3081 /* 3082 * If vdev_validate() returns failure (indicated by 3083 * EBADF), it indicates that one of the vdevs indicates 3084 * that the pool has been exported or destroyed. If 3085 * this is the case, the config cache is out of sync and 3086 * we should remove the pool from the namespace. 3087 */ 3088 spa_unload(spa); 3089 spa_deactivate(spa); 3090 spa_config_sync(spa, B_TRUE, B_TRUE); 3091 spa_remove(spa); 3092 if (locked) 3093 mutex_exit(&spa_namespace_lock); 3094 return (SET_ERROR(ENOENT)); 3095 } 3096 3097 if (error) { 3098 /* 3099 * We can't open the pool, but we still have useful 3100 * information: the state of each vdev after the 3101 * attempted vdev_open(). Return this to the user. 3102 */ 3103 if (config != NULL && spa->spa_config) { 3104 VERIFY(nvlist_dup(spa->spa_config, config, 3105 KM_SLEEP) == 0); 3106 VERIFY(nvlist_add_nvlist(*config, 3107 ZPOOL_CONFIG_LOAD_INFO, 3108 spa->spa_load_info) == 0); 3109 } 3110 spa_unload(spa); 3111 spa_deactivate(spa); 3112 spa->spa_last_open_failed = error; 3113 if (locked) 3114 mutex_exit(&spa_namespace_lock); 3115 *spapp = NULL; 3116 return (error); 3117 } 3118 } 3119 3120 spa_open_ref(spa, tag); 3121 3122 if (config != NULL) 3123 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 3124 3125 /* 3126 * If we've recovered the pool, pass back any information we 3127 * gathered while doing the load. 3128 */ 3129 if (state == SPA_LOAD_RECOVER) { 3130 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 3131 spa->spa_load_info) == 0); 3132 } 3133 3134 if (locked) { 3135 spa->spa_last_open_failed = 0; 3136 spa->spa_last_ubsync_txg = 0; 3137 spa->spa_load_txg = 0; 3138 mutex_exit(&spa_namespace_lock); 3139#ifdef __FreeBSD__ 3140#ifdef _KERNEL 3141 if (firstopen) 3142 zvol_create_minors(spa->spa_name); 3143#endif 3144#endif 3145 } 3146 3147 *spapp = spa; 3148 3149 return (0); 3150} 3151 3152int 3153spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 3154 nvlist_t **config) 3155{ 3156 return (spa_open_common(name, spapp, tag, policy, config)); 3157} 3158 3159int 3160spa_open(const char *name, spa_t **spapp, void *tag) 3161{ 3162 return (spa_open_common(name, spapp, tag, NULL, NULL)); 3163} 3164 3165/* 3166 * Lookup the given spa_t, incrementing the inject count in the process, 3167 * preventing it from being exported or destroyed. 3168 */ 3169spa_t * 3170spa_inject_addref(char *name) 3171{ 3172 spa_t *spa; 3173 3174 mutex_enter(&spa_namespace_lock); 3175 if ((spa = spa_lookup(name)) == NULL) { 3176 mutex_exit(&spa_namespace_lock); 3177 return (NULL); 3178 } 3179 spa->spa_inject_ref++; 3180 mutex_exit(&spa_namespace_lock); 3181 3182 return (spa); 3183} 3184 3185void 3186spa_inject_delref(spa_t *spa) 3187{ 3188 mutex_enter(&spa_namespace_lock); 3189 spa->spa_inject_ref--; 3190 mutex_exit(&spa_namespace_lock); 3191} 3192 3193/* 3194 * Add spares device information to the nvlist. 3195 */ 3196static void 3197spa_add_spares(spa_t *spa, nvlist_t *config) 3198{ 3199 nvlist_t **spares; 3200 uint_t i, nspares; 3201 nvlist_t *nvroot; 3202 uint64_t guid; 3203 vdev_stat_t *vs; 3204 uint_t vsc; 3205 uint64_t pool; 3206 3207 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3208 3209 if (spa->spa_spares.sav_count == 0) 3210 return; 3211 3212 VERIFY(nvlist_lookup_nvlist(config, 3213 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3214 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 3215 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3216 if (nspares != 0) { 3217 VERIFY(nvlist_add_nvlist_array(nvroot, 3218 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3219 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3220 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3221 3222 /* 3223 * Go through and find any spares which have since been 3224 * repurposed as an active spare. If this is the case, update 3225 * their status appropriately. 3226 */ 3227 for (i = 0; i < nspares; i++) { 3228 VERIFY(nvlist_lookup_uint64(spares[i], 3229 ZPOOL_CONFIG_GUID, &guid) == 0); 3230 if (spa_spare_exists(guid, &pool, NULL) && 3231 pool != 0ULL) { 3232 VERIFY(nvlist_lookup_uint64_array( 3233 spares[i], ZPOOL_CONFIG_VDEV_STATS, 3234 (uint64_t **)&vs, &vsc) == 0); 3235 vs->vs_state = VDEV_STATE_CANT_OPEN; 3236 vs->vs_aux = VDEV_AUX_SPARED; 3237 } 3238 } 3239 } 3240} 3241 3242/* 3243 * Add l2cache device information to the nvlist, including vdev stats. 3244 */ 3245static void 3246spa_add_l2cache(spa_t *spa, nvlist_t *config) 3247{ 3248 nvlist_t **l2cache; 3249 uint_t i, j, nl2cache; 3250 nvlist_t *nvroot; 3251 uint64_t guid; 3252 vdev_t *vd; 3253 vdev_stat_t *vs; 3254 uint_t vsc; 3255 3256 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3257 3258 if (spa->spa_l2cache.sav_count == 0) 3259 return; 3260 3261 VERIFY(nvlist_lookup_nvlist(config, 3262 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3263 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 3264 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3265 if (nl2cache != 0) { 3266 VERIFY(nvlist_add_nvlist_array(nvroot, 3267 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3268 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3269 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3270 3271 /* 3272 * Update level 2 cache device stats. 3273 */ 3274 3275 for (i = 0; i < nl2cache; i++) { 3276 VERIFY(nvlist_lookup_uint64(l2cache[i], 3277 ZPOOL_CONFIG_GUID, &guid) == 0); 3278 3279 vd = NULL; 3280 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 3281 if (guid == 3282 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 3283 vd = spa->spa_l2cache.sav_vdevs[j]; 3284 break; 3285 } 3286 } 3287 ASSERT(vd != NULL); 3288 3289 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 3290 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 3291 == 0); 3292 vdev_get_stats(vd, vs); 3293 } 3294 } 3295} 3296 3297static void 3298spa_add_feature_stats(spa_t *spa, nvlist_t *config) 3299{ 3300 nvlist_t *features; 3301 zap_cursor_t zc; 3302 zap_attribute_t za; 3303 3304 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3305 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3306 3307 /* We may be unable to read features if pool is suspended. */ 3308 if (spa_suspended(spa)) 3309 goto out; 3310 3311 if (spa->spa_feat_for_read_obj != 0) { 3312 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3313 spa->spa_feat_for_read_obj); 3314 zap_cursor_retrieve(&zc, &za) == 0; 3315 zap_cursor_advance(&zc)) { 3316 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3317 za.za_num_integers == 1); 3318 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3319 za.za_first_integer)); 3320 } 3321 zap_cursor_fini(&zc); 3322 } 3323 3324 if (spa->spa_feat_for_write_obj != 0) { 3325 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3326 spa->spa_feat_for_write_obj); 3327 zap_cursor_retrieve(&zc, &za) == 0; 3328 zap_cursor_advance(&zc)) { 3329 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3330 za.za_num_integers == 1); 3331 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3332 za.za_first_integer)); 3333 } 3334 zap_cursor_fini(&zc); 3335 } 3336 3337out: 3338 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 3339 features) == 0); 3340 nvlist_free(features); 3341} 3342 3343int 3344spa_get_stats(const char *name, nvlist_t **config, 3345 char *altroot, size_t buflen) 3346{ 3347 int error; 3348 spa_t *spa; 3349 3350 *config = NULL; 3351 error = spa_open_common(name, &spa, FTAG, NULL, config); 3352 3353 if (spa != NULL) { 3354 /* 3355 * This still leaves a window of inconsistency where the spares 3356 * or l2cache devices could change and the config would be 3357 * self-inconsistent. 3358 */ 3359 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 3360 3361 if (*config != NULL) { 3362 uint64_t loadtimes[2]; 3363 3364 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 3365 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 3366 VERIFY(nvlist_add_uint64_array(*config, 3367 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 3368 3369 VERIFY(nvlist_add_uint64(*config, 3370 ZPOOL_CONFIG_ERRCOUNT, 3371 spa_get_errlog_size(spa)) == 0); 3372 3373 if (spa_suspended(spa)) 3374 VERIFY(nvlist_add_uint64(*config, 3375 ZPOOL_CONFIG_SUSPENDED, 3376 spa->spa_failmode) == 0); 3377 3378 spa_add_spares(spa, *config); 3379 spa_add_l2cache(spa, *config); 3380 spa_add_feature_stats(spa, *config); 3381 } 3382 } 3383 3384 /* 3385 * We want to get the alternate root even for faulted pools, so we cheat 3386 * and call spa_lookup() directly. 3387 */ 3388 if (altroot) { 3389 if (spa == NULL) { 3390 mutex_enter(&spa_namespace_lock); 3391 spa = spa_lookup(name); 3392 if (spa) 3393 spa_altroot(spa, altroot, buflen); 3394 else 3395 altroot[0] = '\0'; 3396 spa = NULL; 3397 mutex_exit(&spa_namespace_lock); 3398 } else { 3399 spa_altroot(spa, altroot, buflen); 3400 } 3401 } 3402 3403 if (spa != NULL) { 3404 spa_config_exit(spa, SCL_CONFIG, FTAG); 3405 spa_close(spa, FTAG); 3406 } 3407 3408 return (error); 3409} 3410 3411/* 3412 * Validate that the auxiliary device array is well formed. We must have an 3413 * array of nvlists, each which describes a valid leaf vdev. If this is an 3414 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 3415 * specified, as long as they are well-formed. 3416 */ 3417static int 3418spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 3419 spa_aux_vdev_t *sav, const char *config, uint64_t version, 3420 vdev_labeltype_t label) 3421{ 3422 nvlist_t **dev; 3423 uint_t i, ndev; 3424 vdev_t *vd; 3425 int error; 3426 3427 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3428 3429 /* 3430 * It's acceptable to have no devs specified. 3431 */ 3432 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 3433 return (0); 3434 3435 if (ndev == 0) 3436 return (SET_ERROR(EINVAL)); 3437 3438 /* 3439 * Make sure the pool is formatted with a version that supports this 3440 * device type. 3441 */ 3442 if (spa_version(spa) < version) 3443 return (SET_ERROR(ENOTSUP)); 3444 3445 /* 3446 * Set the pending device list so we correctly handle device in-use 3447 * checking. 3448 */ 3449 sav->sav_pending = dev; 3450 sav->sav_npending = ndev; 3451 3452 for (i = 0; i < ndev; i++) { 3453 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 3454 mode)) != 0) 3455 goto out; 3456 3457 if (!vd->vdev_ops->vdev_op_leaf) { 3458 vdev_free(vd); 3459 error = SET_ERROR(EINVAL); 3460 goto out; 3461 } 3462 3463 /* 3464 * The L2ARC currently only supports disk devices in 3465 * kernel context. For user-level testing, we allow it. 3466 */ 3467#ifdef _KERNEL 3468 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 3469 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 3470 error = SET_ERROR(ENOTBLK); 3471 vdev_free(vd); 3472 goto out; 3473 } 3474#endif 3475 vd->vdev_top = vd; 3476 3477 if ((error = vdev_open(vd)) == 0 && 3478 (error = vdev_label_init(vd, crtxg, label)) == 0) { 3479 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 3480 vd->vdev_guid) == 0); 3481 } 3482 3483 vdev_free(vd); 3484 3485 if (error && 3486 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 3487 goto out; 3488 else 3489 error = 0; 3490 } 3491 3492out: 3493 sav->sav_pending = NULL; 3494 sav->sav_npending = 0; 3495 return (error); 3496} 3497 3498static int 3499spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 3500{ 3501 int error; 3502 3503 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3504 3505 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3506 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 3507 VDEV_LABEL_SPARE)) != 0) { 3508 return (error); 3509 } 3510 3511 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3512 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 3513 VDEV_LABEL_L2CACHE)); 3514} 3515 3516static void 3517spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 3518 const char *config) 3519{ 3520 int i; 3521 3522 if (sav->sav_config != NULL) { 3523 nvlist_t **olddevs; 3524 uint_t oldndevs; 3525 nvlist_t **newdevs; 3526 3527 /* 3528 * Generate new dev list by concatentating with the 3529 * current dev list. 3530 */ 3531 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 3532 &olddevs, &oldndevs) == 0); 3533 3534 newdevs = kmem_alloc(sizeof (void *) * 3535 (ndevs + oldndevs), KM_SLEEP); 3536 for (i = 0; i < oldndevs; i++) 3537 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 3538 KM_SLEEP) == 0); 3539 for (i = 0; i < ndevs; i++) 3540 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 3541 KM_SLEEP) == 0); 3542 3543 VERIFY(nvlist_remove(sav->sav_config, config, 3544 DATA_TYPE_NVLIST_ARRAY) == 0); 3545 3546 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 3547 config, newdevs, ndevs + oldndevs) == 0); 3548 for (i = 0; i < oldndevs + ndevs; i++) 3549 nvlist_free(newdevs[i]); 3550 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 3551 } else { 3552 /* 3553 * Generate a new dev list. 3554 */ 3555 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 3556 KM_SLEEP) == 0); 3557 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 3558 devs, ndevs) == 0); 3559 } 3560} 3561 3562/* 3563 * Stop and drop level 2 ARC devices 3564 */ 3565void 3566spa_l2cache_drop(spa_t *spa) 3567{ 3568 vdev_t *vd; 3569 int i; 3570 spa_aux_vdev_t *sav = &spa->spa_l2cache; 3571 3572 for (i = 0; i < sav->sav_count; i++) { 3573 uint64_t pool; 3574 3575 vd = sav->sav_vdevs[i]; 3576 ASSERT(vd != NULL); 3577 3578 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 3579 pool != 0ULL && l2arc_vdev_present(vd)) 3580 l2arc_remove_vdev(vd); 3581 } 3582} 3583 3584/* 3585 * Pool Creation 3586 */ 3587int 3588spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 3589 nvlist_t *zplprops) 3590{ 3591 spa_t *spa; 3592 char *altroot = NULL; 3593 vdev_t *rvd; 3594 dsl_pool_t *dp; 3595 dmu_tx_t *tx; 3596 int error = 0; 3597 uint64_t txg = TXG_INITIAL; 3598 nvlist_t **spares, **l2cache; 3599 uint_t nspares, nl2cache; 3600 uint64_t version, obj; 3601 boolean_t has_features; 3602 3603 /* 3604 * If this pool already exists, return failure. 3605 */ 3606 mutex_enter(&spa_namespace_lock); 3607 if (spa_lookup(pool) != NULL) { 3608 mutex_exit(&spa_namespace_lock); 3609 return (SET_ERROR(EEXIST)); 3610 } 3611 3612 /* 3613 * Allocate a new spa_t structure. 3614 */ 3615 (void) nvlist_lookup_string(props, 3616 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 3617 spa = spa_add(pool, NULL, altroot); 3618 spa_activate(spa, spa_mode_global); 3619 3620 if (props && (error = spa_prop_validate(spa, props))) { 3621 spa_deactivate(spa); 3622 spa_remove(spa); 3623 mutex_exit(&spa_namespace_lock); 3624 return (error); 3625 } 3626 3627 has_features = B_FALSE; 3628 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 3629 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 3630 if (zpool_prop_feature(nvpair_name(elem))) 3631 has_features = B_TRUE; 3632 } 3633 3634 if (has_features || nvlist_lookup_uint64(props, 3635 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 3636 version = SPA_VERSION; 3637 } 3638 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 3639 3640 spa->spa_first_txg = txg; 3641 spa->spa_uberblock.ub_txg = txg - 1; 3642 spa->spa_uberblock.ub_version = version; 3643 spa->spa_ubsync = spa->spa_uberblock; 3644 3645 /* 3646 * Create "The Godfather" zio to hold all async IOs 3647 */ 3648 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 3649 KM_SLEEP); 3650 for (int i = 0; i < max_ncpus; i++) { 3651 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 3652 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 3653 ZIO_FLAG_GODFATHER); 3654 } 3655 3656 /* 3657 * Create the root vdev. 3658 */ 3659 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3660 3661 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 3662 3663 ASSERT(error != 0 || rvd != NULL); 3664 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 3665 3666 if (error == 0 && !zfs_allocatable_devs(nvroot)) 3667 error = SET_ERROR(EINVAL); 3668 3669 if (error == 0 && 3670 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 3671 (error = spa_validate_aux(spa, nvroot, txg, 3672 VDEV_ALLOC_ADD)) == 0) { 3673 for (int c = 0; c < rvd->vdev_children; c++) { 3674 vdev_ashift_optimize(rvd->vdev_child[c]); 3675 vdev_metaslab_set_size(rvd->vdev_child[c]); 3676 vdev_expand(rvd->vdev_child[c], txg); 3677 } 3678 } 3679 3680 spa_config_exit(spa, SCL_ALL, FTAG); 3681 3682 if (error != 0) { 3683 spa_unload(spa); 3684 spa_deactivate(spa); 3685 spa_remove(spa); 3686 mutex_exit(&spa_namespace_lock); 3687 return (error); 3688 } 3689 3690 /* 3691 * Get the list of spares, if specified. 3692 */ 3693 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 3694 &spares, &nspares) == 0) { 3695 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 3696 KM_SLEEP) == 0); 3697 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 3698 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3699 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3700 spa_load_spares(spa); 3701 spa_config_exit(spa, SCL_ALL, FTAG); 3702 spa->spa_spares.sav_sync = B_TRUE; 3703 } 3704 3705 /* 3706 * Get the list of level 2 cache devices, if specified. 3707 */ 3708 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 3709 &l2cache, &nl2cache) == 0) { 3710 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 3711 NV_UNIQUE_NAME, KM_SLEEP) == 0); 3712 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 3713 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3714 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3715 spa_load_l2cache(spa); 3716 spa_config_exit(spa, SCL_ALL, FTAG); 3717 spa->spa_l2cache.sav_sync = B_TRUE; 3718 } 3719 3720 spa->spa_is_initializing = B_TRUE; 3721 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 3722 spa->spa_meta_objset = dp->dp_meta_objset; 3723 spa->spa_is_initializing = B_FALSE; 3724 3725 /* 3726 * Create DDTs (dedup tables). 3727 */ 3728 ddt_create(spa); 3729 3730 spa_update_dspace(spa); 3731 3732 tx = dmu_tx_create_assigned(dp, txg); 3733 3734 /* 3735 * Create the pool config object. 3736 */ 3737 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 3738 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 3739 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 3740 3741 if (zap_add(spa->spa_meta_objset, 3742 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 3743 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 3744 cmn_err(CE_PANIC, "failed to add pool config"); 3745 } 3746 3747 if (spa_version(spa) >= SPA_VERSION_FEATURES) 3748 spa_feature_create_zap_objects(spa, tx); 3749 3750 if (zap_add(spa->spa_meta_objset, 3751 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 3752 sizeof (uint64_t), 1, &version, tx) != 0) { 3753 cmn_err(CE_PANIC, "failed to add pool version"); 3754 } 3755 3756 /* Newly created pools with the right version are always deflated. */ 3757 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 3758 spa->spa_deflate = TRUE; 3759 if (zap_add(spa->spa_meta_objset, 3760 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 3761 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 3762 cmn_err(CE_PANIC, "failed to add deflate"); 3763 } 3764 } 3765 3766 /* 3767 * Create the deferred-free bpobj. Turn off compression 3768 * because sync-to-convergence takes longer if the blocksize 3769 * keeps changing. 3770 */ 3771 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 3772 dmu_object_set_compress(spa->spa_meta_objset, obj, 3773 ZIO_COMPRESS_OFF, tx); 3774 if (zap_add(spa->spa_meta_objset, 3775 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 3776 sizeof (uint64_t), 1, &obj, tx) != 0) { 3777 cmn_err(CE_PANIC, "failed to add bpobj"); 3778 } 3779 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 3780 spa->spa_meta_objset, obj)); 3781 3782 /* 3783 * Create the pool's history object. 3784 */ 3785 if (version >= SPA_VERSION_ZPOOL_HISTORY) 3786 spa_history_create_obj(spa, tx); 3787 3788 /* 3789 * Generate some random noise for salted checksums to operate on. 3790 */ 3791 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 3792 sizeof (spa->spa_cksum_salt.zcs_bytes)); 3793 3794 /* 3795 * Set pool properties. 3796 */ 3797 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 3798 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3799 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 3800 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 3801 3802 if (props != NULL) { 3803 spa_configfile_set(spa, props, B_FALSE); 3804 spa_sync_props(props, tx); 3805 } 3806 3807 dmu_tx_commit(tx); 3808 3809 spa->spa_sync_on = B_TRUE; 3810 txg_sync_start(spa->spa_dsl_pool); 3811 3812 /* 3813 * We explicitly wait for the first transaction to complete so that our 3814 * bean counters are appropriately updated. 3815 */ 3816 txg_wait_synced(spa->spa_dsl_pool, txg); 3817 3818 spa_config_sync(spa, B_FALSE, B_TRUE); 3819 spa_event_notify(spa, NULL, ESC_ZFS_POOL_CREATE); 3820 3821 spa_history_log_version(spa, "create"); 3822 3823 /* 3824 * Don't count references from objsets that are already closed 3825 * and are making their way through the eviction process. 3826 */ 3827 spa_evicting_os_wait(spa); 3828 spa->spa_minref = refcount_count(&spa->spa_refcount); 3829 3830 mutex_exit(&spa_namespace_lock); 3831 3832 return (0); 3833} 3834 3835#ifdef _KERNEL 3836#ifdef illumos 3837/* 3838 * Get the root pool information from the root disk, then import the root pool 3839 * during the system boot up time. 3840 */ 3841extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 3842 3843static nvlist_t * 3844spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 3845{ 3846 nvlist_t *config; 3847 nvlist_t *nvtop, *nvroot; 3848 uint64_t pgid; 3849 3850 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 3851 return (NULL); 3852 3853 /* 3854 * Add this top-level vdev to the child array. 3855 */ 3856 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3857 &nvtop) == 0); 3858 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 3859 &pgid) == 0); 3860 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 3861 3862 /* 3863 * Put this pool's top-level vdevs into a root vdev. 3864 */ 3865 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3866 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 3867 VDEV_TYPE_ROOT) == 0); 3868 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 3869 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 3870 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 3871 &nvtop, 1) == 0); 3872 3873 /* 3874 * Replace the existing vdev_tree with the new root vdev in 3875 * this pool's configuration (remove the old, add the new). 3876 */ 3877 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 3878 nvlist_free(nvroot); 3879 return (config); 3880} 3881 3882/* 3883 * Walk the vdev tree and see if we can find a device with "better" 3884 * configuration. A configuration is "better" if the label on that 3885 * device has a more recent txg. 3886 */ 3887static void 3888spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 3889{ 3890 for (int c = 0; c < vd->vdev_children; c++) 3891 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 3892 3893 if (vd->vdev_ops->vdev_op_leaf) { 3894 nvlist_t *label; 3895 uint64_t label_txg; 3896 3897 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 3898 &label) != 0) 3899 return; 3900 3901 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 3902 &label_txg) == 0); 3903 3904 /* 3905 * Do we have a better boot device? 3906 */ 3907 if (label_txg > *txg) { 3908 *txg = label_txg; 3909 *avd = vd; 3910 } 3911 nvlist_free(label); 3912 } 3913} 3914 3915/* 3916 * Import a root pool. 3917 * 3918 * For x86. devpath_list will consist of devid and/or physpath name of 3919 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 3920 * The GRUB "findroot" command will return the vdev we should boot. 3921 * 3922 * For Sparc, devpath_list consists the physpath name of the booting device 3923 * no matter the rootpool is a single device pool or a mirrored pool. 3924 * e.g. 3925 * "/pci@1f,0/ide@d/disk@0,0:a" 3926 */ 3927int 3928spa_import_rootpool(char *devpath, char *devid) 3929{ 3930 spa_t *spa; 3931 vdev_t *rvd, *bvd, *avd = NULL; 3932 nvlist_t *config, *nvtop; 3933 uint64_t guid, txg; 3934 char *pname; 3935 int error; 3936 3937 /* 3938 * Read the label from the boot device and generate a configuration. 3939 */ 3940 config = spa_generate_rootconf(devpath, devid, &guid); 3941#if defined(_OBP) && defined(_KERNEL) 3942 if (config == NULL) { 3943 if (strstr(devpath, "/iscsi/ssd") != NULL) { 3944 /* iscsi boot */ 3945 get_iscsi_bootpath_phy(devpath); 3946 config = spa_generate_rootconf(devpath, devid, &guid); 3947 } 3948 } 3949#endif 3950 if (config == NULL) { 3951 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 3952 devpath); 3953 return (SET_ERROR(EIO)); 3954 } 3955 3956 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 3957 &pname) == 0); 3958 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 3959 3960 mutex_enter(&spa_namespace_lock); 3961 if ((spa = spa_lookup(pname)) != NULL) { 3962 /* 3963 * Remove the existing root pool from the namespace so that we 3964 * can replace it with the correct config we just read in. 3965 */ 3966 spa_remove(spa); 3967 } 3968 3969 spa = spa_add(pname, config, NULL); 3970 spa->spa_is_root = B_TRUE; 3971 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 3972 3973 /* 3974 * Build up a vdev tree based on the boot device's label config. 3975 */ 3976 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3977 &nvtop) == 0); 3978 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3979 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 3980 VDEV_ALLOC_ROOTPOOL); 3981 spa_config_exit(spa, SCL_ALL, FTAG); 3982 if (error) { 3983 mutex_exit(&spa_namespace_lock); 3984 nvlist_free(config); 3985 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 3986 pname); 3987 return (error); 3988 } 3989 3990 /* 3991 * Get the boot vdev. 3992 */ 3993 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 3994 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 3995 (u_longlong_t)guid); 3996 error = SET_ERROR(ENOENT); 3997 goto out; 3998 } 3999 4000 /* 4001 * Determine if there is a better boot device. 4002 */ 4003 avd = bvd; 4004 spa_alt_rootvdev(rvd, &avd, &txg); 4005 if (avd != bvd) { 4006 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 4007 "try booting from '%s'", avd->vdev_path); 4008 error = SET_ERROR(EINVAL); 4009 goto out; 4010 } 4011 4012 /* 4013 * If the boot device is part of a spare vdev then ensure that 4014 * we're booting off the active spare. 4015 */ 4016 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 4017 !bvd->vdev_isspare) { 4018 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 4019 "try booting from '%s'", 4020 bvd->vdev_parent-> 4021 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 4022 error = SET_ERROR(EINVAL); 4023 goto out; 4024 } 4025 4026 error = 0; 4027out: 4028 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4029 vdev_free(rvd); 4030 spa_config_exit(spa, SCL_ALL, FTAG); 4031 mutex_exit(&spa_namespace_lock); 4032 4033 nvlist_free(config); 4034 return (error); 4035} 4036 4037#else /* !illumos */ 4038 4039extern int vdev_geom_read_pool_label(const char *name, nvlist_t ***configs, 4040 uint64_t *count); 4041 4042static nvlist_t * 4043spa_generate_rootconf(const char *name) 4044{ 4045 nvlist_t **configs, **tops; 4046 nvlist_t *config; 4047 nvlist_t *best_cfg, *nvtop, *nvroot; 4048 uint64_t *holes; 4049 uint64_t best_txg; 4050 uint64_t nchildren; 4051 uint64_t pgid; 4052 uint64_t count; 4053 uint64_t i; 4054 uint_t nholes; 4055 4056 if (vdev_geom_read_pool_label(name, &configs, &count) != 0) 4057 return (NULL); 4058 4059 ASSERT3U(count, !=, 0); 4060 best_txg = 0; 4061 for (i = 0; i < count; i++) { 4062 uint64_t txg; 4063 4064 VERIFY(nvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG, 4065 &txg) == 0); 4066 if (txg > best_txg) { 4067 best_txg = txg; 4068 best_cfg = configs[i]; 4069 } 4070 } 4071 4072 /* 4073 * Multi-vdev root pool configuration discovery is not supported yet. 4074 */ 4075 nchildren = 1; 4076 nvlist_lookup_uint64(best_cfg, ZPOOL_CONFIG_VDEV_CHILDREN, &nchildren); 4077 holes = NULL; 4078 nvlist_lookup_uint64_array(best_cfg, ZPOOL_CONFIG_HOLE_ARRAY, 4079 &holes, &nholes); 4080 4081 tops = kmem_zalloc(nchildren * sizeof(void *), KM_SLEEP); 4082 for (i = 0; i < nchildren; i++) { 4083 if (i >= count) 4084 break; 4085 if (configs[i] == NULL) 4086 continue; 4087 VERIFY(nvlist_lookup_nvlist(configs[i], ZPOOL_CONFIG_VDEV_TREE, 4088 &nvtop) == 0); 4089 nvlist_dup(nvtop, &tops[i], KM_SLEEP); 4090 } 4091 for (i = 0; holes != NULL && i < nholes; i++) { 4092 if (i >= nchildren) 4093 continue; 4094 if (tops[holes[i]] != NULL) 4095 continue; 4096 nvlist_alloc(&tops[holes[i]], NV_UNIQUE_NAME, KM_SLEEP); 4097 VERIFY(nvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE, 4098 VDEV_TYPE_HOLE) == 0); 4099 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID, 4100 holes[i]) == 0); 4101 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID, 4102 0) == 0); 4103 } 4104 for (i = 0; i < nchildren; i++) { 4105 if (tops[i] != NULL) 4106 continue; 4107 nvlist_alloc(&tops[i], NV_UNIQUE_NAME, KM_SLEEP); 4108 VERIFY(nvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE, 4109 VDEV_TYPE_MISSING) == 0); 4110 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID, 4111 i) == 0); 4112 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID, 4113 0) == 0); 4114 } 4115 4116 /* 4117 * Create pool config based on the best vdev config. 4118 */ 4119 nvlist_dup(best_cfg, &config, KM_SLEEP); 4120 4121 /* 4122 * Put this pool's top-level vdevs into a root vdev. 4123 */ 4124 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 4125 &pgid) == 0); 4126 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4127 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 4128 VDEV_TYPE_ROOT) == 0); 4129 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 4130 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 4131 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 4132 tops, nchildren) == 0); 4133 4134 /* 4135 * Replace the existing vdev_tree with the new root vdev in 4136 * this pool's configuration (remove the old, add the new). 4137 */ 4138 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 4139 4140 /* 4141 * Drop vdev config elements that should not be present at pool level. 4142 */ 4143 nvlist_remove(config, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64); 4144 nvlist_remove(config, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64); 4145 4146 for (i = 0; i < count; i++) 4147 nvlist_free(configs[i]); 4148 kmem_free(configs, count * sizeof(void *)); 4149 for (i = 0; i < nchildren; i++) 4150 nvlist_free(tops[i]); 4151 kmem_free(tops, nchildren * sizeof(void *)); 4152 nvlist_free(nvroot); 4153 return (config); 4154} 4155 4156int 4157spa_import_rootpool(const char *name) 4158{ 4159 spa_t *spa; 4160 vdev_t *rvd, *bvd, *avd = NULL; 4161 nvlist_t *config, *nvtop; 4162 uint64_t txg; 4163 char *pname; 4164 int error; 4165 4166 /* 4167 * Read the label from the boot device and generate a configuration. 4168 */ 4169 config = spa_generate_rootconf(name); 4170 4171 mutex_enter(&spa_namespace_lock); 4172 if (config != NULL) { 4173 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 4174 &pname) == 0 && strcmp(name, pname) == 0); 4175 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) 4176 == 0); 4177 4178 if ((spa = spa_lookup(pname)) != NULL) { 4179 /* 4180 * Remove the existing root pool from the namespace so 4181 * that we can replace it with the correct config 4182 * we just read in. 4183 */ 4184 spa_remove(spa); 4185 } 4186 spa = spa_add(pname, config, NULL); 4187 4188 /* 4189 * Set spa_ubsync.ub_version as it can be used in vdev_alloc() 4190 * via spa_version(). 4191 */ 4192 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 4193 &spa->spa_ubsync.ub_version) != 0) 4194 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 4195 } else if ((spa = spa_lookup(name)) == NULL) { 4196 mutex_exit(&spa_namespace_lock); 4197 nvlist_free(config); 4198 cmn_err(CE_NOTE, "Cannot find the pool label for '%s'", 4199 name); 4200 return (EIO); 4201 } else { 4202 VERIFY(nvlist_dup(spa->spa_config, &config, KM_SLEEP) == 0); 4203 } 4204 spa->spa_is_root = B_TRUE; 4205 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 4206 4207 /* 4208 * Build up a vdev tree based on the boot device's label config. 4209 */ 4210 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4211 &nvtop) == 0); 4212 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4213 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 4214 VDEV_ALLOC_ROOTPOOL); 4215 spa_config_exit(spa, SCL_ALL, FTAG); 4216 if (error) { 4217 mutex_exit(&spa_namespace_lock); 4218 nvlist_free(config); 4219 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 4220 pname); 4221 return (error); 4222 } 4223 4224 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4225 vdev_free(rvd); 4226 spa_config_exit(spa, SCL_ALL, FTAG); 4227 mutex_exit(&spa_namespace_lock); 4228 4229 nvlist_free(config); 4230 return (0); 4231} 4232 4233#endif /* illumos */ 4234#endif /* _KERNEL */ 4235 4236/* 4237 * Import a non-root pool into the system. 4238 */ 4239int 4240spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 4241{ 4242 spa_t *spa; 4243 char *altroot = NULL; 4244 spa_load_state_t state = SPA_LOAD_IMPORT; 4245 zpool_rewind_policy_t policy; 4246 uint64_t mode = spa_mode_global; 4247 uint64_t readonly = B_FALSE; 4248 int error; 4249 nvlist_t *nvroot; 4250 nvlist_t **spares, **l2cache; 4251 uint_t nspares, nl2cache; 4252 4253 /* 4254 * If a pool with this name exists, return failure. 4255 */ 4256 mutex_enter(&spa_namespace_lock); 4257 if (spa_lookup(pool) != NULL) { 4258 mutex_exit(&spa_namespace_lock); 4259 return (SET_ERROR(EEXIST)); 4260 } 4261 4262 /* 4263 * Create and initialize the spa structure. 4264 */ 4265 (void) nvlist_lookup_string(props, 4266 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4267 (void) nvlist_lookup_uint64(props, 4268 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 4269 if (readonly) 4270 mode = FREAD; 4271 spa = spa_add(pool, config, altroot); 4272 spa->spa_import_flags = flags; 4273 4274 /* 4275 * Verbatim import - Take a pool and insert it into the namespace 4276 * as if it had been loaded at boot. 4277 */ 4278 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 4279 if (props != NULL) 4280 spa_configfile_set(spa, props, B_FALSE); 4281 4282 spa_config_sync(spa, B_FALSE, B_TRUE); 4283 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4284 4285 mutex_exit(&spa_namespace_lock); 4286 return (0); 4287 } 4288 4289 spa_activate(spa, mode); 4290 4291 /* 4292 * Don't start async tasks until we know everything is healthy. 4293 */ 4294 spa_async_suspend(spa); 4295 4296 zpool_get_rewind_policy(config, &policy); 4297 if (policy.zrp_request & ZPOOL_DO_REWIND) 4298 state = SPA_LOAD_RECOVER; 4299 4300 /* 4301 * Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig 4302 * because the user-supplied config is actually the one to trust when 4303 * doing an import. 4304 */ 4305 if (state != SPA_LOAD_RECOVER) 4306 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4307 4308 error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg, 4309 policy.zrp_request); 4310 4311 /* 4312 * Propagate anything learned while loading the pool and pass it 4313 * back to caller (i.e. rewind info, missing devices, etc). 4314 */ 4315 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4316 spa->spa_load_info) == 0); 4317 4318 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4319 /* 4320 * Toss any existing sparelist, as it doesn't have any validity 4321 * anymore, and conflicts with spa_has_spare(). 4322 */ 4323 if (spa->spa_spares.sav_config) { 4324 nvlist_free(spa->spa_spares.sav_config); 4325 spa->spa_spares.sav_config = NULL; 4326 spa_load_spares(spa); 4327 } 4328 if (spa->spa_l2cache.sav_config) { 4329 nvlist_free(spa->spa_l2cache.sav_config); 4330 spa->spa_l2cache.sav_config = NULL; 4331 spa_load_l2cache(spa); 4332 } 4333 4334 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4335 &nvroot) == 0); 4336 if (error == 0) 4337 error = spa_validate_aux(spa, nvroot, -1ULL, 4338 VDEV_ALLOC_SPARE); 4339 if (error == 0) 4340 error = spa_validate_aux(spa, nvroot, -1ULL, 4341 VDEV_ALLOC_L2CACHE); 4342 spa_config_exit(spa, SCL_ALL, FTAG); 4343 4344 if (props != NULL) 4345 spa_configfile_set(spa, props, B_FALSE); 4346 4347 if (error != 0 || (props && spa_writeable(spa) && 4348 (error = spa_prop_set(spa, props)))) { 4349 spa_unload(spa); 4350 spa_deactivate(spa); 4351 spa_remove(spa); 4352 mutex_exit(&spa_namespace_lock); 4353 return (error); 4354 } 4355 4356 spa_async_resume(spa); 4357 4358 /* 4359 * Override any spares and level 2 cache devices as specified by 4360 * the user, as these may have correct device names/devids, etc. 4361 */ 4362 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4363 &spares, &nspares) == 0) { 4364 if (spa->spa_spares.sav_config) 4365 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 4366 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 4367 else 4368 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 4369 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4370 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4371 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4372 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4373 spa_load_spares(spa); 4374 spa_config_exit(spa, SCL_ALL, FTAG); 4375 spa->spa_spares.sav_sync = B_TRUE; 4376 } 4377 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4378 &l2cache, &nl2cache) == 0) { 4379 if (spa->spa_l2cache.sav_config) 4380 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 4381 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 4382 else 4383 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4384 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4385 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4386 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4387 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4388 spa_load_l2cache(spa); 4389 spa_config_exit(spa, SCL_ALL, FTAG); 4390 spa->spa_l2cache.sav_sync = B_TRUE; 4391 } 4392 4393 /* 4394 * Check for any removed devices. 4395 */ 4396 if (spa->spa_autoreplace) { 4397 spa_aux_check_removed(&spa->spa_spares); 4398 spa_aux_check_removed(&spa->spa_l2cache); 4399 } 4400 4401 if (spa_writeable(spa)) { 4402 /* 4403 * Update the config cache to include the newly-imported pool. 4404 */ 4405 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4406 } 4407 4408 /* 4409 * It's possible that the pool was expanded while it was exported. 4410 * We kick off an async task to handle this for us. 4411 */ 4412 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 4413 4414 spa_history_log_version(spa, "import"); 4415 4416 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4417 4418 mutex_exit(&spa_namespace_lock); 4419 4420#ifdef __FreeBSD__ 4421#ifdef _KERNEL 4422 zvol_create_minors(pool); 4423#endif 4424#endif 4425 return (0); 4426} 4427 4428nvlist_t * 4429spa_tryimport(nvlist_t *tryconfig) 4430{ 4431 nvlist_t *config = NULL; 4432 char *poolname; 4433 spa_t *spa; 4434 uint64_t state; 4435 int error; 4436 4437 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 4438 return (NULL); 4439 4440 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 4441 return (NULL); 4442 4443 /* 4444 * Create and initialize the spa structure. 4445 */ 4446 mutex_enter(&spa_namespace_lock); 4447 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 4448 spa_activate(spa, FREAD); 4449 4450 /* 4451 * Pass off the heavy lifting to spa_load(). 4452 * Pass TRUE for mosconfig because the user-supplied config 4453 * is actually the one to trust when doing an import. 4454 */ 4455 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE); 4456 4457 /* 4458 * If 'tryconfig' was at least parsable, return the current config. 4459 */ 4460 if (spa->spa_root_vdev != NULL) { 4461 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4462 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 4463 poolname) == 0); 4464 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 4465 state) == 0); 4466 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 4467 spa->spa_uberblock.ub_timestamp) == 0); 4468 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4469 spa->spa_load_info) == 0); 4470 4471 /* 4472 * If the bootfs property exists on this pool then we 4473 * copy it out so that external consumers can tell which 4474 * pools are bootable. 4475 */ 4476 if ((!error || error == EEXIST) && spa->spa_bootfs) { 4477 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4478 4479 /* 4480 * We have to play games with the name since the 4481 * pool was opened as TRYIMPORT_NAME. 4482 */ 4483 if (dsl_dsobj_to_dsname(spa_name(spa), 4484 spa->spa_bootfs, tmpname) == 0) { 4485 char *cp; 4486 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4487 4488 cp = strchr(tmpname, '/'); 4489 if (cp == NULL) { 4490 (void) strlcpy(dsname, tmpname, 4491 MAXPATHLEN); 4492 } else { 4493 (void) snprintf(dsname, MAXPATHLEN, 4494 "%s/%s", poolname, ++cp); 4495 } 4496 VERIFY(nvlist_add_string(config, 4497 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 4498 kmem_free(dsname, MAXPATHLEN); 4499 } 4500 kmem_free(tmpname, MAXPATHLEN); 4501 } 4502 4503 /* 4504 * Add the list of hot spares and level 2 cache devices. 4505 */ 4506 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4507 spa_add_spares(spa, config); 4508 spa_add_l2cache(spa, config); 4509 spa_config_exit(spa, SCL_CONFIG, FTAG); 4510 } 4511 4512 spa_unload(spa); 4513 spa_deactivate(spa); 4514 spa_remove(spa); 4515 mutex_exit(&spa_namespace_lock); 4516 4517 return (config); 4518} 4519 4520/* 4521 * Pool export/destroy 4522 * 4523 * The act of destroying or exporting a pool is very simple. We make sure there 4524 * is no more pending I/O and any references to the pool are gone. Then, we 4525 * update the pool state and sync all the labels to disk, removing the 4526 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 4527 * we don't sync the labels or remove the configuration cache. 4528 */ 4529static int 4530spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 4531 boolean_t force, boolean_t hardforce) 4532{ 4533 spa_t *spa; 4534 4535 if (oldconfig) 4536 *oldconfig = NULL; 4537 4538 if (!(spa_mode_global & FWRITE)) 4539 return (SET_ERROR(EROFS)); 4540 4541 mutex_enter(&spa_namespace_lock); 4542 if ((spa = spa_lookup(pool)) == NULL) { 4543 mutex_exit(&spa_namespace_lock); 4544 return (SET_ERROR(ENOENT)); 4545 } 4546 4547 /* 4548 * Put a hold on the pool, drop the namespace lock, stop async tasks, 4549 * reacquire the namespace lock, and see if we can export. 4550 */ 4551 spa_open_ref(spa, FTAG); 4552 mutex_exit(&spa_namespace_lock); 4553 spa_async_suspend(spa); 4554 mutex_enter(&spa_namespace_lock); 4555 spa_close(spa, FTAG); 4556 4557 /* 4558 * The pool will be in core if it's openable, 4559 * in which case we can modify its state. 4560 */ 4561 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 4562 /* 4563 * Objsets may be open only because they're dirty, so we 4564 * have to force it to sync before checking spa_refcnt. 4565 */ 4566 txg_wait_synced(spa->spa_dsl_pool, 0); 4567 spa_evicting_os_wait(spa); 4568 4569 /* 4570 * A pool cannot be exported or destroyed if there are active 4571 * references. If we are resetting a pool, allow references by 4572 * fault injection handlers. 4573 */ 4574 if (!spa_refcount_zero(spa) || 4575 (spa->spa_inject_ref != 0 && 4576 new_state != POOL_STATE_UNINITIALIZED)) { 4577 spa_async_resume(spa); 4578 mutex_exit(&spa_namespace_lock); 4579 return (SET_ERROR(EBUSY)); 4580 } 4581 4582 /* 4583 * A pool cannot be exported if it has an active shared spare. 4584 * This is to prevent other pools stealing the active spare 4585 * from an exported pool. At user's own will, such pool can 4586 * be forcedly exported. 4587 */ 4588 if (!force && new_state == POOL_STATE_EXPORTED && 4589 spa_has_active_shared_spare(spa)) { 4590 spa_async_resume(spa); 4591 mutex_exit(&spa_namespace_lock); 4592 return (SET_ERROR(EXDEV)); 4593 } 4594 4595 /* 4596 * We want this to be reflected on every label, 4597 * so mark them all dirty. spa_unload() will do the 4598 * final sync that pushes these changes out. 4599 */ 4600 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 4601 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4602 spa->spa_state = new_state; 4603 spa->spa_final_txg = spa_last_synced_txg(spa) + 4604 TXG_DEFER_SIZE + 1; 4605 vdev_config_dirty(spa->spa_root_vdev); 4606 spa_config_exit(spa, SCL_ALL, FTAG); 4607 } 4608 } 4609 4610 spa_event_notify(spa, NULL, ESC_ZFS_POOL_DESTROY); 4611 4612 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 4613 spa_unload(spa); 4614 spa_deactivate(spa); 4615 } 4616 4617 if (oldconfig && spa->spa_config) 4618 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 4619 4620 if (new_state != POOL_STATE_UNINITIALIZED) { 4621 if (!hardforce) 4622 spa_config_sync(spa, B_TRUE, B_TRUE); 4623 spa_remove(spa); 4624 } 4625 mutex_exit(&spa_namespace_lock); 4626 4627 return (0); 4628} 4629 4630/* 4631 * Destroy a storage pool. 4632 */ 4633int 4634spa_destroy(char *pool) 4635{ 4636 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 4637 B_FALSE, B_FALSE)); 4638} 4639 4640/* 4641 * Export a storage pool. 4642 */ 4643int 4644spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 4645 boolean_t hardforce) 4646{ 4647 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 4648 force, hardforce)); 4649} 4650 4651/* 4652 * Similar to spa_export(), this unloads the spa_t without actually removing it 4653 * from the namespace in any way. 4654 */ 4655int 4656spa_reset(char *pool) 4657{ 4658 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 4659 B_FALSE, B_FALSE)); 4660} 4661 4662/* 4663 * ========================================================================== 4664 * Device manipulation 4665 * ========================================================================== 4666 */ 4667 4668/* 4669 * Add a device to a storage pool. 4670 */ 4671int 4672spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 4673{ 4674 uint64_t txg, id; 4675 int error; 4676 vdev_t *rvd = spa->spa_root_vdev; 4677 vdev_t *vd, *tvd; 4678 nvlist_t **spares, **l2cache; 4679 uint_t nspares, nl2cache; 4680 4681 ASSERT(spa_writeable(spa)); 4682 4683 txg = spa_vdev_enter(spa); 4684 4685 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 4686 VDEV_ALLOC_ADD)) != 0) 4687 return (spa_vdev_exit(spa, NULL, txg, error)); 4688 4689 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 4690 4691 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 4692 &nspares) != 0) 4693 nspares = 0; 4694 4695 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 4696 &nl2cache) != 0) 4697 nl2cache = 0; 4698 4699 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 4700 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 4701 4702 if (vd->vdev_children != 0 && 4703 (error = vdev_create(vd, txg, B_FALSE)) != 0) 4704 return (spa_vdev_exit(spa, vd, txg, error)); 4705 4706 /* 4707 * We must validate the spares and l2cache devices after checking the 4708 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 4709 */ 4710 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 4711 return (spa_vdev_exit(spa, vd, txg, error)); 4712 4713 /* 4714 * Transfer each new top-level vdev from vd to rvd. 4715 */ 4716 for (int c = 0; c < vd->vdev_children; c++) { 4717 4718 /* 4719 * Set the vdev id to the first hole, if one exists. 4720 */ 4721 for (id = 0; id < rvd->vdev_children; id++) { 4722 if (rvd->vdev_child[id]->vdev_ishole) { 4723 vdev_free(rvd->vdev_child[id]); 4724 break; 4725 } 4726 } 4727 tvd = vd->vdev_child[c]; 4728 vdev_remove_child(vd, tvd); 4729 tvd->vdev_id = id; 4730 vdev_add_child(rvd, tvd); 4731 vdev_config_dirty(tvd); 4732 } 4733 4734 if (nspares != 0) { 4735 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 4736 ZPOOL_CONFIG_SPARES); 4737 spa_load_spares(spa); 4738 spa->spa_spares.sav_sync = B_TRUE; 4739 } 4740 4741 if (nl2cache != 0) { 4742 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 4743 ZPOOL_CONFIG_L2CACHE); 4744 spa_load_l2cache(spa); 4745 spa->spa_l2cache.sav_sync = B_TRUE; 4746 } 4747 4748 /* 4749 * We have to be careful when adding new vdevs to an existing pool. 4750 * If other threads start allocating from these vdevs before we 4751 * sync the config cache, and we lose power, then upon reboot we may 4752 * fail to open the pool because there are DVAs that the config cache 4753 * can't translate. Therefore, we first add the vdevs without 4754 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 4755 * and then let spa_config_update() initialize the new metaslabs. 4756 * 4757 * spa_load() checks for added-but-not-initialized vdevs, so that 4758 * if we lose power at any point in this sequence, the remaining 4759 * steps will be completed the next time we load the pool. 4760 */ 4761 (void) spa_vdev_exit(spa, vd, txg, 0); 4762 4763 mutex_enter(&spa_namespace_lock); 4764 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4765 spa_event_notify(spa, NULL, ESC_ZFS_VDEV_ADD); 4766 mutex_exit(&spa_namespace_lock); 4767 4768 return (0); 4769} 4770 4771/* 4772 * Attach a device to a mirror. The arguments are the path to any device 4773 * in the mirror, and the nvroot for the new device. If the path specifies 4774 * a device that is not mirrored, we automatically insert the mirror vdev. 4775 * 4776 * If 'replacing' is specified, the new device is intended to replace the 4777 * existing device; in this case the two devices are made into their own 4778 * mirror using the 'replacing' vdev, which is functionally identical to 4779 * the mirror vdev (it actually reuses all the same ops) but has a few 4780 * extra rules: you can't attach to it after it's been created, and upon 4781 * completion of resilvering, the first disk (the one being replaced) 4782 * is automatically detached. 4783 */ 4784int 4785spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 4786{ 4787 uint64_t txg, dtl_max_txg; 4788 vdev_t *rvd = spa->spa_root_vdev; 4789 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 4790 vdev_ops_t *pvops; 4791 char *oldvdpath, *newvdpath; 4792 int newvd_isspare; 4793 int error; 4794 4795 ASSERT(spa_writeable(spa)); 4796 4797 txg = spa_vdev_enter(spa); 4798 4799 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 4800 4801 if (oldvd == NULL) 4802 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4803 4804 if (!oldvd->vdev_ops->vdev_op_leaf) 4805 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4806 4807 pvd = oldvd->vdev_parent; 4808 4809 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 4810 VDEV_ALLOC_ATTACH)) != 0) 4811 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 4812 4813 if (newrootvd->vdev_children != 1) 4814 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4815 4816 newvd = newrootvd->vdev_child[0]; 4817 4818 if (!newvd->vdev_ops->vdev_op_leaf) 4819 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4820 4821 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 4822 return (spa_vdev_exit(spa, newrootvd, txg, error)); 4823 4824 /* 4825 * Spares can't replace logs 4826 */ 4827 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 4828 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4829 4830 if (!replacing) { 4831 /* 4832 * For attach, the only allowable parent is a mirror or the root 4833 * vdev. 4834 */ 4835 if (pvd->vdev_ops != &vdev_mirror_ops && 4836 pvd->vdev_ops != &vdev_root_ops) 4837 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4838 4839 pvops = &vdev_mirror_ops; 4840 } else { 4841 /* 4842 * Active hot spares can only be replaced by inactive hot 4843 * spares. 4844 */ 4845 if (pvd->vdev_ops == &vdev_spare_ops && 4846 oldvd->vdev_isspare && 4847 !spa_has_spare(spa, newvd->vdev_guid)) 4848 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4849 4850 /* 4851 * If the source is a hot spare, and the parent isn't already a 4852 * spare, then we want to create a new hot spare. Otherwise, we 4853 * want to create a replacing vdev. The user is not allowed to 4854 * attach to a spared vdev child unless the 'isspare' state is 4855 * the same (spare replaces spare, non-spare replaces 4856 * non-spare). 4857 */ 4858 if (pvd->vdev_ops == &vdev_replacing_ops && 4859 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 4860 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4861 } else if (pvd->vdev_ops == &vdev_spare_ops && 4862 newvd->vdev_isspare != oldvd->vdev_isspare) { 4863 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4864 } 4865 4866 if (newvd->vdev_isspare) 4867 pvops = &vdev_spare_ops; 4868 else 4869 pvops = &vdev_replacing_ops; 4870 } 4871 4872 /* 4873 * Make sure the new device is big enough. 4874 */ 4875 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 4876 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 4877 4878 /* 4879 * The new device cannot have a higher alignment requirement 4880 * than the top-level vdev. 4881 */ 4882 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 4883 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 4884 4885 /* 4886 * If this is an in-place replacement, update oldvd's path and devid 4887 * to make it distinguishable from newvd, and unopenable from now on. 4888 */ 4889 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 4890 spa_strfree(oldvd->vdev_path); 4891 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 4892 KM_SLEEP); 4893 (void) sprintf(oldvd->vdev_path, "%s/%s", 4894 newvd->vdev_path, "old"); 4895 if (oldvd->vdev_devid != NULL) { 4896 spa_strfree(oldvd->vdev_devid); 4897 oldvd->vdev_devid = NULL; 4898 } 4899 } 4900 4901 /* mark the device being resilvered */ 4902 newvd->vdev_resilver_txg = txg; 4903 4904 /* 4905 * If the parent is not a mirror, or if we're replacing, insert the new 4906 * mirror/replacing/spare vdev above oldvd. 4907 */ 4908 if (pvd->vdev_ops != pvops) 4909 pvd = vdev_add_parent(oldvd, pvops); 4910 4911 ASSERT(pvd->vdev_top->vdev_parent == rvd); 4912 ASSERT(pvd->vdev_ops == pvops); 4913 ASSERT(oldvd->vdev_parent == pvd); 4914 4915 /* 4916 * Extract the new device from its root and add it to pvd. 4917 */ 4918 vdev_remove_child(newrootvd, newvd); 4919 newvd->vdev_id = pvd->vdev_children; 4920 newvd->vdev_crtxg = oldvd->vdev_crtxg; 4921 vdev_add_child(pvd, newvd); 4922 4923 tvd = newvd->vdev_top; 4924 ASSERT(pvd->vdev_top == tvd); 4925 ASSERT(tvd->vdev_parent == rvd); 4926 4927 vdev_config_dirty(tvd); 4928 4929 /* 4930 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 4931 * for any dmu_sync-ed blocks. It will propagate upward when 4932 * spa_vdev_exit() calls vdev_dtl_reassess(). 4933 */ 4934 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 4935 4936 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 4937 dtl_max_txg - TXG_INITIAL); 4938 4939 if (newvd->vdev_isspare) { 4940 spa_spare_activate(newvd); 4941 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE); 4942 } 4943 4944 oldvdpath = spa_strdup(oldvd->vdev_path); 4945 newvdpath = spa_strdup(newvd->vdev_path); 4946 newvd_isspare = newvd->vdev_isspare; 4947 4948 /* 4949 * Mark newvd's DTL dirty in this txg. 4950 */ 4951 vdev_dirty(tvd, VDD_DTL, newvd, txg); 4952 4953 /* 4954 * Schedule the resilver to restart in the future. We do this to 4955 * ensure that dmu_sync-ed blocks have been stitched into the 4956 * respective datasets. 4957 */ 4958 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 4959 4960 if (spa->spa_bootfs) 4961 spa_event_notify(spa, newvd, ESC_ZFS_BOOTFS_VDEV_ATTACH); 4962 4963 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_ATTACH); 4964 4965 /* 4966 * Commit the config 4967 */ 4968 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 4969 4970 spa_history_log_internal(spa, "vdev attach", NULL, 4971 "%s vdev=%s %s vdev=%s", 4972 replacing && newvd_isspare ? "spare in" : 4973 replacing ? "replace" : "attach", newvdpath, 4974 replacing ? "for" : "to", oldvdpath); 4975 4976 spa_strfree(oldvdpath); 4977 spa_strfree(newvdpath); 4978 4979 return (0); 4980} 4981 4982/* 4983 * Detach a device from a mirror or replacing vdev. 4984 * 4985 * If 'replace_done' is specified, only detach if the parent 4986 * is a replacing vdev. 4987 */ 4988int 4989spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 4990{ 4991 uint64_t txg; 4992 int error; 4993 vdev_t *rvd = spa->spa_root_vdev; 4994 vdev_t *vd, *pvd, *cvd, *tvd; 4995 boolean_t unspare = B_FALSE; 4996 uint64_t unspare_guid = 0; 4997 char *vdpath; 4998 4999 ASSERT(spa_writeable(spa)); 5000 5001 txg = spa_vdev_enter(spa); 5002 5003 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5004 5005 if (vd == NULL) 5006 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 5007 5008 if (!vd->vdev_ops->vdev_op_leaf) 5009 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5010 5011 pvd = vd->vdev_parent; 5012 5013 /* 5014 * If the parent/child relationship is not as expected, don't do it. 5015 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 5016 * vdev that's replacing B with C. The user's intent in replacing 5017 * is to go from M(A,B) to M(A,C). If the user decides to cancel 5018 * the replace by detaching C, the expected behavior is to end up 5019 * M(A,B). But suppose that right after deciding to detach C, 5020 * the replacement of B completes. We would have M(A,C), and then 5021 * ask to detach C, which would leave us with just A -- not what 5022 * the user wanted. To prevent this, we make sure that the 5023 * parent/child relationship hasn't changed -- in this example, 5024 * that C's parent is still the replacing vdev R. 5025 */ 5026 if (pvd->vdev_guid != pguid && pguid != 0) 5027 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5028 5029 /* 5030 * Only 'replacing' or 'spare' vdevs can be replaced. 5031 */ 5032 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 5033 pvd->vdev_ops != &vdev_spare_ops) 5034 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5035 5036 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 5037 spa_version(spa) >= SPA_VERSION_SPARES); 5038 5039 /* 5040 * Only mirror, replacing, and spare vdevs support detach. 5041 */ 5042 if (pvd->vdev_ops != &vdev_replacing_ops && 5043 pvd->vdev_ops != &vdev_mirror_ops && 5044 pvd->vdev_ops != &vdev_spare_ops) 5045 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5046 5047 /* 5048 * If this device has the only valid copy of some data, 5049 * we cannot safely detach it. 5050 */ 5051 if (vdev_dtl_required(vd)) 5052 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5053 5054 ASSERT(pvd->vdev_children >= 2); 5055 5056 /* 5057 * If we are detaching the second disk from a replacing vdev, then 5058 * check to see if we changed the original vdev's path to have "/old" 5059 * at the end in spa_vdev_attach(). If so, undo that change now. 5060 */ 5061 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 5062 vd->vdev_path != NULL) { 5063 size_t len = strlen(vd->vdev_path); 5064 5065 for (int c = 0; c < pvd->vdev_children; c++) { 5066 cvd = pvd->vdev_child[c]; 5067 5068 if (cvd == vd || cvd->vdev_path == NULL) 5069 continue; 5070 5071 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 5072 strcmp(cvd->vdev_path + len, "/old") == 0) { 5073 spa_strfree(cvd->vdev_path); 5074 cvd->vdev_path = spa_strdup(vd->vdev_path); 5075 break; 5076 } 5077 } 5078 } 5079 5080 /* 5081 * If we are detaching the original disk from a spare, then it implies 5082 * that the spare should become a real disk, and be removed from the 5083 * active spare list for the pool. 5084 */ 5085 if (pvd->vdev_ops == &vdev_spare_ops && 5086 vd->vdev_id == 0 && 5087 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 5088 unspare = B_TRUE; 5089 5090 /* 5091 * Erase the disk labels so the disk can be used for other things. 5092 * This must be done after all other error cases are handled, 5093 * but before we disembowel vd (so we can still do I/O to it). 5094 * But if we can't do it, don't treat the error as fatal -- 5095 * it may be that the unwritability of the disk is the reason 5096 * it's being detached! 5097 */ 5098 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5099 5100 /* 5101 * Remove vd from its parent and compact the parent's children. 5102 */ 5103 vdev_remove_child(pvd, vd); 5104 vdev_compact_children(pvd); 5105 5106 /* 5107 * Remember one of the remaining children so we can get tvd below. 5108 */ 5109 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 5110 5111 /* 5112 * If we need to remove the remaining child from the list of hot spares, 5113 * do it now, marking the vdev as no longer a spare in the process. 5114 * We must do this before vdev_remove_parent(), because that can 5115 * change the GUID if it creates a new toplevel GUID. For a similar 5116 * reason, we must remove the spare now, in the same txg as the detach; 5117 * otherwise someone could attach a new sibling, change the GUID, and 5118 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 5119 */ 5120 if (unspare) { 5121 ASSERT(cvd->vdev_isspare); 5122 spa_spare_remove(cvd); 5123 unspare_guid = cvd->vdev_guid; 5124 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 5125 cvd->vdev_unspare = B_TRUE; 5126 } 5127 5128 /* 5129 * If the parent mirror/replacing vdev only has one child, 5130 * the parent is no longer needed. Remove it from the tree. 5131 */ 5132 if (pvd->vdev_children == 1) { 5133 if (pvd->vdev_ops == &vdev_spare_ops) 5134 cvd->vdev_unspare = B_FALSE; 5135 vdev_remove_parent(cvd); 5136 } 5137 5138 5139 /* 5140 * We don't set tvd until now because the parent we just removed 5141 * may have been the previous top-level vdev. 5142 */ 5143 tvd = cvd->vdev_top; 5144 ASSERT(tvd->vdev_parent == rvd); 5145 5146 /* 5147 * Reevaluate the parent vdev state. 5148 */ 5149 vdev_propagate_state(cvd); 5150 5151 /* 5152 * If the 'autoexpand' property is set on the pool then automatically 5153 * try to expand the size of the pool. For example if the device we 5154 * just detached was smaller than the others, it may be possible to 5155 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 5156 * first so that we can obtain the updated sizes of the leaf vdevs. 5157 */ 5158 if (spa->spa_autoexpand) { 5159 vdev_reopen(tvd); 5160 vdev_expand(tvd, txg); 5161 } 5162 5163 vdev_config_dirty(tvd); 5164 5165 /* 5166 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 5167 * vd->vdev_detached is set and free vd's DTL object in syncing context. 5168 * But first make sure we're not on any *other* txg's DTL list, to 5169 * prevent vd from being accessed after it's freed. 5170 */ 5171 vdpath = spa_strdup(vd->vdev_path); 5172 for (int t = 0; t < TXG_SIZE; t++) 5173 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 5174 vd->vdev_detached = B_TRUE; 5175 vdev_dirty(tvd, VDD_DTL, vd, txg); 5176 5177 spa_event_notify(spa, vd, ESC_ZFS_VDEV_REMOVE); 5178 5179 /* hang on to the spa before we release the lock */ 5180 spa_open_ref(spa, FTAG); 5181 5182 error = spa_vdev_exit(spa, vd, txg, 0); 5183 5184 spa_history_log_internal(spa, "detach", NULL, 5185 "vdev=%s", vdpath); 5186 spa_strfree(vdpath); 5187 5188 /* 5189 * If this was the removal of the original device in a hot spare vdev, 5190 * then we want to go through and remove the device from the hot spare 5191 * list of every other pool. 5192 */ 5193 if (unspare) { 5194 spa_t *altspa = NULL; 5195 5196 mutex_enter(&spa_namespace_lock); 5197 while ((altspa = spa_next(altspa)) != NULL) { 5198 if (altspa->spa_state != POOL_STATE_ACTIVE || 5199 altspa == spa) 5200 continue; 5201 5202 spa_open_ref(altspa, FTAG); 5203 mutex_exit(&spa_namespace_lock); 5204 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 5205 mutex_enter(&spa_namespace_lock); 5206 spa_close(altspa, FTAG); 5207 } 5208 mutex_exit(&spa_namespace_lock); 5209 5210 /* search the rest of the vdevs for spares to remove */ 5211 spa_vdev_resilver_done(spa); 5212 } 5213 5214 /* all done with the spa; OK to release */ 5215 mutex_enter(&spa_namespace_lock); 5216 spa_close(spa, FTAG); 5217 mutex_exit(&spa_namespace_lock); 5218 5219 return (error); 5220} 5221 5222/* 5223 * Split a set of devices from their mirrors, and create a new pool from them. 5224 */ 5225int 5226spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 5227 nvlist_t *props, boolean_t exp) 5228{ 5229 int error = 0; 5230 uint64_t txg, *glist; 5231 spa_t *newspa; 5232 uint_t c, children, lastlog; 5233 nvlist_t **child, *nvl, *tmp; 5234 dmu_tx_t *tx; 5235 char *altroot = NULL; 5236 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 5237 boolean_t activate_slog; 5238 5239 ASSERT(spa_writeable(spa)); 5240 5241 txg = spa_vdev_enter(spa); 5242 5243 /* clear the log and flush everything up to now */ 5244 activate_slog = spa_passivate_log(spa); 5245 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5246 error = spa_offline_log(spa); 5247 txg = spa_vdev_config_enter(spa); 5248 5249 if (activate_slog) 5250 spa_activate_log(spa); 5251 5252 if (error != 0) 5253 return (spa_vdev_exit(spa, NULL, txg, error)); 5254 5255 /* check new spa name before going any further */ 5256 if (spa_lookup(newname) != NULL) 5257 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 5258 5259 /* 5260 * scan through all the children to ensure they're all mirrors 5261 */ 5262 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 5263 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 5264 &children) != 0) 5265 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5266 5267 /* first, check to ensure we've got the right child count */ 5268 rvd = spa->spa_root_vdev; 5269 lastlog = 0; 5270 for (c = 0; c < rvd->vdev_children; c++) { 5271 vdev_t *vd = rvd->vdev_child[c]; 5272 5273 /* don't count the holes & logs as children */ 5274 if (vd->vdev_islog || vd->vdev_ishole) { 5275 if (lastlog == 0) 5276 lastlog = c; 5277 continue; 5278 } 5279 5280 lastlog = 0; 5281 } 5282 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 5283 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5284 5285 /* next, ensure no spare or cache devices are part of the split */ 5286 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 5287 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 5288 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5289 5290 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 5291 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 5292 5293 /* then, loop over each vdev and validate it */ 5294 for (c = 0; c < children; c++) { 5295 uint64_t is_hole = 0; 5296 5297 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 5298 &is_hole); 5299 5300 if (is_hole != 0) { 5301 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 5302 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 5303 continue; 5304 } else { 5305 error = SET_ERROR(EINVAL); 5306 break; 5307 } 5308 } 5309 5310 /* which disk is going to be split? */ 5311 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 5312 &glist[c]) != 0) { 5313 error = SET_ERROR(EINVAL); 5314 break; 5315 } 5316 5317 /* look it up in the spa */ 5318 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 5319 if (vml[c] == NULL) { 5320 error = SET_ERROR(ENODEV); 5321 break; 5322 } 5323 5324 /* make sure there's nothing stopping the split */ 5325 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 5326 vml[c]->vdev_islog || 5327 vml[c]->vdev_ishole || 5328 vml[c]->vdev_isspare || 5329 vml[c]->vdev_isl2cache || 5330 !vdev_writeable(vml[c]) || 5331 vml[c]->vdev_children != 0 || 5332 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 5333 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 5334 error = SET_ERROR(EINVAL); 5335 break; 5336 } 5337 5338 if (vdev_dtl_required(vml[c])) { 5339 error = SET_ERROR(EBUSY); 5340 break; 5341 } 5342 5343 /* we need certain info from the top level */ 5344 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 5345 vml[c]->vdev_top->vdev_ms_array) == 0); 5346 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 5347 vml[c]->vdev_top->vdev_ms_shift) == 0); 5348 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 5349 vml[c]->vdev_top->vdev_asize) == 0); 5350 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 5351 vml[c]->vdev_top->vdev_ashift) == 0); 5352 } 5353 5354 if (error != 0) { 5355 kmem_free(vml, children * sizeof (vdev_t *)); 5356 kmem_free(glist, children * sizeof (uint64_t)); 5357 return (spa_vdev_exit(spa, NULL, txg, error)); 5358 } 5359 5360 /* stop writers from using the disks */ 5361 for (c = 0; c < children; c++) { 5362 if (vml[c] != NULL) 5363 vml[c]->vdev_offline = B_TRUE; 5364 } 5365 vdev_reopen(spa->spa_root_vdev); 5366 5367 /* 5368 * Temporarily record the splitting vdevs in the spa config. This 5369 * will disappear once the config is regenerated. 5370 */ 5371 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5372 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 5373 glist, children) == 0); 5374 kmem_free(glist, children * sizeof (uint64_t)); 5375 5376 mutex_enter(&spa->spa_props_lock); 5377 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 5378 nvl) == 0); 5379 mutex_exit(&spa->spa_props_lock); 5380 spa->spa_config_splitting = nvl; 5381 vdev_config_dirty(spa->spa_root_vdev); 5382 5383 /* configure and create the new pool */ 5384 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 5385 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5386 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 5387 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 5388 spa_version(spa)) == 0); 5389 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 5390 spa->spa_config_txg) == 0); 5391 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 5392 spa_generate_guid(NULL)) == 0); 5393 (void) nvlist_lookup_string(props, 5394 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5395 5396 /* add the new pool to the namespace */ 5397 newspa = spa_add(newname, config, altroot); 5398 newspa->spa_config_txg = spa->spa_config_txg; 5399 spa_set_log_state(newspa, SPA_LOG_CLEAR); 5400 5401 /* release the spa config lock, retaining the namespace lock */ 5402 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5403 5404 if (zio_injection_enabled) 5405 zio_handle_panic_injection(spa, FTAG, 1); 5406 5407 spa_activate(newspa, spa_mode_global); 5408 spa_async_suspend(newspa); 5409 5410#ifndef illumos 5411 /* mark that we are creating new spa by splitting */ 5412 newspa->spa_splitting_newspa = B_TRUE; 5413#endif 5414 /* create the new pool from the disks of the original pool */ 5415 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE); 5416#ifndef illumos 5417 newspa->spa_splitting_newspa = B_FALSE; 5418#endif 5419 if (error) 5420 goto out; 5421 5422 /* if that worked, generate a real config for the new pool */ 5423 if (newspa->spa_root_vdev != NULL) { 5424 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 5425 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5426 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 5427 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 5428 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 5429 B_TRUE)); 5430 } 5431 5432 /* set the props */ 5433 if (props != NULL) { 5434 spa_configfile_set(newspa, props, B_FALSE); 5435 error = spa_prop_set(newspa, props); 5436 if (error) 5437 goto out; 5438 } 5439 5440 /* flush everything */ 5441 txg = spa_vdev_config_enter(newspa); 5442 vdev_config_dirty(newspa->spa_root_vdev); 5443 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 5444 5445 if (zio_injection_enabled) 5446 zio_handle_panic_injection(spa, FTAG, 2); 5447 5448 spa_async_resume(newspa); 5449 5450 /* finally, update the original pool's config */ 5451 txg = spa_vdev_config_enter(spa); 5452 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 5453 error = dmu_tx_assign(tx, TXG_WAIT); 5454 if (error != 0) 5455 dmu_tx_abort(tx); 5456 for (c = 0; c < children; c++) { 5457 if (vml[c] != NULL) { 5458 vdev_split(vml[c]); 5459 if (error == 0) 5460 spa_history_log_internal(spa, "detach", tx, 5461 "vdev=%s", vml[c]->vdev_path); 5462 vdev_free(vml[c]); 5463 } 5464 } 5465 vdev_config_dirty(spa->spa_root_vdev); 5466 spa->spa_config_splitting = NULL; 5467 nvlist_free(nvl); 5468 if (error == 0) 5469 dmu_tx_commit(tx); 5470 (void) spa_vdev_exit(spa, NULL, txg, 0); 5471 5472 if (zio_injection_enabled) 5473 zio_handle_panic_injection(spa, FTAG, 3); 5474 5475 /* split is complete; log a history record */ 5476 spa_history_log_internal(newspa, "split", NULL, 5477 "from pool %s", spa_name(spa)); 5478 5479 kmem_free(vml, children * sizeof (vdev_t *)); 5480 5481 /* if we're not going to mount the filesystems in userland, export */ 5482 if (exp) 5483 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 5484 B_FALSE, B_FALSE); 5485 5486 return (error); 5487 5488out: 5489 spa_unload(newspa); 5490 spa_deactivate(newspa); 5491 spa_remove(newspa); 5492 5493 txg = spa_vdev_config_enter(spa); 5494 5495 /* re-online all offlined disks */ 5496 for (c = 0; c < children; c++) { 5497 if (vml[c] != NULL) 5498 vml[c]->vdev_offline = B_FALSE; 5499 } 5500 vdev_reopen(spa->spa_root_vdev); 5501 5502 nvlist_free(spa->spa_config_splitting); 5503 spa->spa_config_splitting = NULL; 5504 (void) spa_vdev_exit(spa, NULL, txg, error); 5505 5506 kmem_free(vml, children * sizeof (vdev_t *)); 5507 return (error); 5508} 5509 5510static nvlist_t * 5511spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid) 5512{ 5513 for (int i = 0; i < count; i++) { 5514 uint64_t guid; 5515 5516 VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID, 5517 &guid) == 0); 5518 5519 if (guid == target_guid) 5520 return (nvpp[i]); 5521 } 5522 5523 return (NULL); 5524} 5525 5526static void 5527spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count, 5528 nvlist_t *dev_to_remove) 5529{ 5530 nvlist_t **newdev = NULL; 5531 5532 if (count > 1) 5533 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP); 5534 5535 for (int i = 0, j = 0; i < count; i++) { 5536 if (dev[i] == dev_to_remove) 5537 continue; 5538 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0); 5539 } 5540 5541 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0); 5542 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0); 5543 5544 for (int i = 0; i < count - 1; i++) 5545 nvlist_free(newdev[i]); 5546 5547 if (count > 1) 5548 kmem_free(newdev, (count - 1) * sizeof (void *)); 5549} 5550 5551/* 5552 * Evacuate the device. 5553 */ 5554static int 5555spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd) 5556{ 5557 uint64_t txg; 5558 int error = 0; 5559 5560 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5561 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5562 ASSERT(vd == vd->vdev_top); 5563 5564 /* 5565 * Evacuate the device. We don't hold the config lock as writer 5566 * since we need to do I/O but we do keep the 5567 * spa_namespace_lock held. Once this completes the device 5568 * should no longer have any blocks allocated on it. 5569 */ 5570 if (vd->vdev_islog) { 5571 if (vd->vdev_stat.vs_alloc != 0) 5572 error = spa_offline_log(spa); 5573 } else { 5574 error = SET_ERROR(ENOTSUP); 5575 } 5576 5577 if (error) 5578 return (error); 5579 5580 /* 5581 * The evacuation succeeded. Remove any remaining MOS metadata 5582 * associated with this vdev, and wait for these changes to sync. 5583 */ 5584 ASSERT0(vd->vdev_stat.vs_alloc); 5585 txg = spa_vdev_config_enter(spa); 5586 vd->vdev_removing = B_TRUE; 5587 vdev_dirty_leaves(vd, VDD_DTL, txg); 5588 vdev_config_dirty(vd); 5589 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5590 5591 return (0); 5592} 5593 5594/* 5595 * Complete the removal by cleaning up the namespace. 5596 */ 5597static void 5598spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd) 5599{ 5600 vdev_t *rvd = spa->spa_root_vdev; 5601 uint64_t id = vd->vdev_id; 5602 boolean_t last_vdev = (id == (rvd->vdev_children - 1)); 5603 5604 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5605 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 5606 ASSERT(vd == vd->vdev_top); 5607 5608 /* 5609 * Only remove any devices which are empty. 5610 */ 5611 if (vd->vdev_stat.vs_alloc != 0) 5612 return; 5613 5614 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5615 5616 if (list_link_active(&vd->vdev_state_dirty_node)) 5617 vdev_state_clean(vd); 5618 if (list_link_active(&vd->vdev_config_dirty_node)) 5619 vdev_config_clean(vd); 5620 5621 vdev_free(vd); 5622 5623 if (last_vdev) { 5624 vdev_compact_children(rvd); 5625 } else { 5626 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops); 5627 vdev_add_child(rvd, vd); 5628 } 5629 vdev_config_dirty(rvd); 5630 5631 /* 5632 * Reassess the health of our root vdev. 5633 */ 5634 vdev_reopen(rvd); 5635} 5636 5637/* 5638 * Remove a device from the pool - 5639 * 5640 * Removing a device from the vdev namespace requires several steps 5641 * and can take a significant amount of time. As a result we use 5642 * the spa_vdev_config_[enter/exit] functions which allow us to 5643 * grab and release the spa_config_lock while still holding the namespace 5644 * lock. During each step the configuration is synced out. 5645 * 5646 * Currently, this supports removing only hot spares, slogs, and level 2 ARC 5647 * devices. 5648 */ 5649int 5650spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare) 5651{ 5652 vdev_t *vd; 5653 metaslab_group_t *mg; 5654 nvlist_t **spares, **l2cache, *nv; 5655 uint64_t txg = 0; 5656 uint_t nspares, nl2cache; 5657 int error = 0; 5658 boolean_t locked = MUTEX_HELD(&spa_namespace_lock); 5659 5660 ASSERT(spa_writeable(spa)); 5661 5662 if (!locked) 5663 txg = spa_vdev_enter(spa); 5664 5665 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5666 5667 if (spa->spa_spares.sav_vdevs != NULL && 5668 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 5669 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 && 5670 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) { 5671 /* 5672 * Only remove the hot spare if it's not currently in use 5673 * in this pool. 5674 */ 5675 if (vd == NULL || unspare) { 5676 spa_vdev_remove_aux(spa->spa_spares.sav_config, 5677 ZPOOL_CONFIG_SPARES, spares, nspares, nv); 5678 spa_load_spares(spa); 5679 spa->spa_spares.sav_sync = B_TRUE; 5680 } else { 5681 error = SET_ERROR(EBUSY); 5682 } 5683 } else if (spa->spa_l2cache.sav_vdevs != NULL && 5684 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 5685 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 && 5686 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) { 5687 /* 5688 * Cache devices can always be removed. 5689 */ 5690 spa_vdev_remove_aux(spa->spa_l2cache.sav_config, 5691 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv); 5692 spa_load_l2cache(spa); 5693 spa->spa_l2cache.sav_sync = B_TRUE; 5694 } else if (vd != NULL && vd->vdev_islog) { 5695 ASSERT(!locked); 5696 ASSERT(vd == vd->vdev_top); 5697 5698 mg = vd->vdev_mg; 5699 5700 /* 5701 * Stop allocating from this vdev. 5702 */ 5703 metaslab_group_passivate(mg); 5704 5705 /* 5706 * Wait for the youngest allocations and frees to sync, 5707 * and then wait for the deferral of those frees to finish. 5708 */ 5709 spa_vdev_config_exit(spa, NULL, 5710 txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG); 5711 5712 /* 5713 * Attempt to evacuate the vdev. 5714 */ 5715 error = spa_vdev_remove_evacuate(spa, vd); 5716 5717 txg = spa_vdev_config_enter(spa); 5718 5719 /* 5720 * If we couldn't evacuate the vdev, unwind. 5721 */ 5722 if (error) { 5723 metaslab_group_activate(mg); 5724 return (spa_vdev_exit(spa, NULL, txg, error)); 5725 } 5726 5727 /* 5728 * Clean up the vdev namespace. 5729 */ 5730 spa_vdev_remove_from_namespace(spa, vd); 5731 5732 } else if (vd != NULL) { 5733 /* 5734 * Normal vdevs cannot be removed (yet). 5735 */ 5736 error = SET_ERROR(ENOTSUP); 5737 } else { 5738 /* 5739 * There is no vdev of any kind with the specified guid. 5740 */ 5741 error = SET_ERROR(ENOENT); 5742 } 5743 5744 if (!locked) 5745 return (spa_vdev_exit(spa, NULL, txg, error)); 5746 5747 return (error); 5748} 5749 5750/* 5751 * Find any device that's done replacing, or a vdev marked 'unspare' that's 5752 * currently spared, so we can detach it. 5753 */ 5754static vdev_t * 5755spa_vdev_resilver_done_hunt(vdev_t *vd) 5756{ 5757 vdev_t *newvd, *oldvd; 5758 5759 for (int c = 0; c < vd->vdev_children; c++) { 5760 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 5761 if (oldvd != NULL) 5762 return (oldvd); 5763 } 5764 5765 /* 5766 * Check for a completed replacement. We always consider the first 5767 * vdev in the list to be the oldest vdev, and the last one to be 5768 * the newest (see spa_vdev_attach() for how that works). In 5769 * the case where the newest vdev is faulted, we will not automatically 5770 * remove it after a resilver completes. This is OK as it will require 5771 * user intervention to determine which disk the admin wishes to keep. 5772 */ 5773 if (vd->vdev_ops == &vdev_replacing_ops) { 5774 ASSERT(vd->vdev_children > 1); 5775 5776 newvd = vd->vdev_child[vd->vdev_children - 1]; 5777 oldvd = vd->vdev_child[0]; 5778 5779 if (vdev_dtl_empty(newvd, DTL_MISSING) && 5780 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5781 !vdev_dtl_required(oldvd)) 5782 return (oldvd); 5783 } 5784 5785 /* 5786 * Check for a completed resilver with the 'unspare' flag set. 5787 */ 5788 if (vd->vdev_ops == &vdev_spare_ops) { 5789 vdev_t *first = vd->vdev_child[0]; 5790 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 5791 5792 if (last->vdev_unspare) { 5793 oldvd = first; 5794 newvd = last; 5795 } else if (first->vdev_unspare) { 5796 oldvd = last; 5797 newvd = first; 5798 } else { 5799 oldvd = NULL; 5800 } 5801 5802 if (oldvd != NULL && 5803 vdev_dtl_empty(newvd, DTL_MISSING) && 5804 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5805 !vdev_dtl_required(oldvd)) 5806 return (oldvd); 5807 5808 /* 5809 * If there are more than two spares attached to a disk, 5810 * and those spares are not required, then we want to 5811 * attempt to free them up now so that they can be used 5812 * by other pools. Once we're back down to a single 5813 * disk+spare, we stop removing them. 5814 */ 5815 if (vd->vdev_children > 2) { 5816 newvd = vd->vdev_child[1]; 5817 5818 if (newvd->vdev_isspare && last->vdev_isspare && 5819 vdev_dtl_empty(last, DTL_MISSING) && 5820 vdev_dtl_empty(last, DTL_OUTAGE) && 5821 !vdev_dtl_required(newvd)) 5822 return (newvd); 5823 } 5824 } 5825 5826 return (NULL); 5827} 5828 5829static void 5830spa_vdev_resilver_done(spa_t *spa) 5831{ 5832 vdev_t *vd, *pvd, *ppvd; 5833 uint64_t guid, sguid, pguid, ppguid; 5834 5835 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5836 5837 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 5838 pvd = vd->vdev_parent; 5839 ppvd = pvd->vdev_parent; 5840 guid = vd->vdev_guid; 5841 pguid = pvd->vdev_guid; 5842 ppguid = ppvd->vdev_guid; 5843 sguid = 0; 5844 /* 5845 * If we have just finished replacing a hot spared device, then 5846 * we need to detach the parent's first child (the original hot 5847 * spare) as well. 5848 */ 5849 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 5850 ppvd->vdev_children == 2) { 5851 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 5852 sguid = ppvd->vdev_child[1]->vdev_guid; 5853 } 5854 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 5855 5856 spa_config_exit(spa, SCL_ALL, FTAG); 5857 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 5858 return; 5859 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 5860 return; 5861 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5862 } 5863 5864 spa_config_exit(spa, SCL_ALL, FTAG); 5865} 5866 5867/* 5868 * Update the stored path or FRU for this vdev. 5869 */ 5870int 5871spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 5872 boolean_t ispath) 5873{ 5874 vdev_t *vd; 5875 boolean_t sync = B_FALSE; 5876 5877 ASSERT(spa_writeable(spa)); 5878 5879 spa_vdev_state_enter(spa, SCL_ALL); 5880 5881 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 5882 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 5883 5884 if (!vd->vdev_ops->vdev_op_leaf) 5885 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 5886 5887 if (ispath) { 5888 if (strcmp(value, vd->vdev_path) != 0) { 5889 spa_strfree(vd->vdev_path); 5890 vd->vdev_path = spa_strdup(value); 5891 sync = B_TRUE; 5892 } 5893 } else { 5894 if (vd->vdev_fru == NULL) { 5895 vd->vdev_fru = spa_strdup(value); 5896 sync = B_TRUE; 5897 } else if (strcmp(value, vd->vdev_fru) != 0) { 5898 spa_strfree(vd->vdev_fru); 5899 vd->vdev_fru = spa_strdup(value); 5900 sync = B_TRUE; 5901 } 5902 } 5903 5904 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 5905} 5906 5907int 5908spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 5909{ 5910 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 5911} 5912 5913int 5914spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 5915{ 5916 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 5917} 5918 5919/* 5920 * ========================================================================== 5921 * SPA Scanning 5922 * ========================================================================== 5923 */ 5924 5925int 5926spa_scan_stop(spa_t *spa) 5927{ 5928 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5929 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 5930 return (SET_ERROR(EBUSY)); 5931 return (dsl_scan_cancel(spa->spa_dsl_pool)); 5932} 5933 5934int 5935spa_scan(spa_t *spa, pool_scan_func_t func) 5936{ 5937 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5938 5939 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 5940 return (SET_ERROR(ENOTSUP)); 5941 5942 /* 5943 * If a resilver was requested, but there is no DTL on a 5944 * writeable leaf device, we have nothing to do. 5945 */ 5946 if (func == POOL_SCAN_RESILVER && 5947 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 5948 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 5949 return (0); 5950 } 5951 5952 return (dsl_scan(spa->spa_dsl_pool, func)); 5953} 5954 5955/* 5956 * ========================================================================== 5957 * SPA async task processing 5958 * ========================================================================== 5959 */ 5960 5961static void 5962spa_async_remove(spa_t *spa, vdev_t *vd) 5963{ 5964 if (vd->vdev_remove_wanted) { 5965 vd->vdev_remove_wanted = B_FALSE; 5966 vd->vdev_delayed_close = B_FALSE; 5967 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 5968 5969 /* 5970 * We want to clear the stats, but we don't want to do a full 5971 * vdev_clear() as that will cause us to throw away 5972 * degraded/faulted state as well as attempt to reopen the 5973 * device, all of which is a waste. 5974 */ 5975 vd->vdev_stat.vs_read_errors = 0; 5976 vd->vdev_stat.vs_write_errors = 0; 5977 vd->vdev_stat.vs_checksum_errors = 0; 5978 5979 vdev_state_dirty(vd->vdev_top); 5980 /* Tell userspace that the vdev is gone. */ 5981 zfs_post_remove(spa, vd); 5982 } 5983 5984 for (int c = 0; c < vd->vdev_children; c++) 5985 spa_async_remove(spa, vd->vdev_child[c]); 5986} 5987 5988static void 5989spa_async_probe(spa_t *spa, vdev_t *vd) 5990{ 5991 if (vd->vdev_probe_wanted) { 5992 vd->vdev_probe_wanted = B_FALSE; 5993 vdev_reopen(vd); /* vdev_open() does the actual probe */ 5994 } 5995 5996 for (int c = 0; c < vd->vdev_children; c++) 5997 spa_async_probe(spa, vd->vdev_child[c]); 5998} 5999 6000static void 6001spa_async_autoexpand(spa_t *spa, vdev_t *vd) 6002{ 6003 sysevent_id_t eid; 6004 nvlist_t *attr; 6005 char *physpath; 6006 6007 if (!spa->spa_autoexpand) 6008 return; 6009 6010 for (int c = 0; c < vd->vdev_children; c++) { 6011 vdev_t *cvd = vd->vdev_child[c]; 6012 spa_async_autoexpand(spa, cvd); 6013 } 6014 6015 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 6016 return; 6017 6018 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 6019 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 6020 6021 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6022 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 6023 6024 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 6025 ESC_ZFS_VDEV_AUTOEXPAND, attr, &eid, DDI_SLEEP); 6026 6027 nvlist_free(attr); 6028 kmem_free(physpath, MAXPATHLEN); 6029} 6030 6031static void 6032spa_async_thread(void *arg) 6033{ 6034 spa_t *spa = arg; 6035 int tasks; 6036 6037 ASSERT(spa->spa_sync_on); 6038 6039 mutex_enter(&spa->spa_async_lock); 6040 tasks = spa->spa_async_tasks; 6041 spa->spa_async_tasks &= SPA_ASYNC_REMOVE; 6042 mutex_exit(&spa->spa_async_lock); 6043 6044 /* 6045 * See if the config needs to be updated. 6046 */ 6047 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 6048 uint64_t old_space, new_space; 6049 6050 mutex_enter(&spa_namespace_lock); 6051 old_space = metaslab_class_get_space(spa_normal_class(spa)); 6052 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 6053 new_space = metaslab_class_get_space(spa_normal_class(spa)); 6054 mutex_exit(&spa_namespace_lock); 6055 6056 /* 6057 * If the pool grew as a result of the config update, 6058 * then log an internal history event. 6059 */ 6060 if (new_space != old_space) { 6061 spa_history_log_internal(spa, "vdev online", NULL, 6062 "pool '%s' size: %llu(+%llu)", 6063 spa_name(spa), new_space, new_space - old_space); 6064 } 6065 } 6066 6067 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 6068 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6069 spa_async_autoexpand(spa, spa->spa_root_vdev); 6070 spa_config_exit(spa, SCL_CONFIG, FTAG); 6071 } 6072 6073 /* 6074 * See if any devices need to be probed. 6075 */ 6076 if (tasks & SPA_ASYNC_PROBE) { 6077 spa_vdev_state_enter(spa, SCL_NONE); 6078 spa_async_probe(spa, spa->spa_root_vdev); 6079 (void) spa_vdev_state_exit(spa, NULL, 0); 6080 } 6081 6082 /* 6083 * If any devices are done replacing, detach them. 6084 */ 6085 if (tasks & SPA_ASYNC_RESILVER_DONE) 6086 spa_vdev_resilver_done(spa); 6087 6088 /* 6089 * Kick off a resilver. 6090 */ 6091 if (tasks & SPA_ASYNC_RESILVER) 6092 dsl_resilver_restart(spa->spa_dsl_pool, 0); 6093 6094 /* 6095 * Let the world know that we're done. 6096 */ 6097 mutex_enter(&spa->spa_async_lock); 6098 spa->spa_async_thread = NULL; 6099 cv_broadcast(&spa->spa_async_cv); 6100 mutex_exit(&spa->spa_async_lock); 6101 thread_exit(); 6102} 6103 6104static void 6105spa_async_thread_vd(void *arg) 6106{ 6107 spa_t *spa = arg; 6108 int tasks; 6109 6110 ASSERT(spa->spa_sync_on); 6111 6112 mutex_enter(&spa->spa_async_lock); 6113 tasks = spa->spa_async_tasks; 6114retry: 6115 spa->spa_async_tasks &= ~SPA_ASYNC_REMOVE; 6116 mutex_exit(&spa->spa_async_lock); 6117 6118 /* 6119 * See if any devices need to be marked REMOVED. 6120 */ 6121 if (tasks & SPA_ASYNC_REMOVE) { 6122 spa_vdev_state_enter(spa, SCL_NONE); 6123 spa_async_remove(spa, spa->spa_root_vdev); 6124 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 6125 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 6126 for (int i = 0; i < spa->spa_spares.sav_count; i++) 6127 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 6128 (void) spa_vdev_state_exit(spa, NULL, 0); 6129 } 6130 6131 /* 6132 * Let the world know that we're done. 6133 */ 6134 mutex_enter(&spa->spa_async_lock); 6135 tasks = spa->spa_async_tasks; 6136 if ((tasks & SPA_ASYNC_REMOVE) != 0) 6137 goto retry; 6138 spa->spa_async_thread_vd = NULL; 6139 cv_broadcast(&spa->spa_async_cv); 6140 mutex_exit(&spa->spa_async_lock); 6141 thread_exit(); 6142} 6143 6144void 6145spa_async_suspend(spa_t *spa) 6146{ 6147 mutex_enter(&spa->spa_async_lock); 6148 spa->spa_async_suspended++; 6149 while (spa->spa_async_thread != NULL && 6150 spa->spa_async_thread_vd != NULL) 6151 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 6152 mutex_exit(&spa->spa_async_lock); 6153} 6154 6155void 6156spa_async_resume(spa_t *spa) 6157{ 6158 mutex_enter(&spa->spa_async_lock); 6159 ASSERT(spa->spa_async_suspended != 0); 6160 spa->spa_async_suspended--; 6161 mutex_exit(&spa->spa_async_lock); 6162} 6163 6164static boolean_t 6165spa_async_tasks_pending(spa_t *spa) 6166{ 6167 uint_t non_config_tasks; 6168 uint_t config_task; 6169 boolean_t config_task_suspended; 6170 6171 non_config_tasks = spa->spa_async_tasks & ~(SPA_ASYNC_CONFIG_UPDATE | 6172 SPA_ASYNC_REMOVE); 6173 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 6174 if (spa->spa_ccw_fail_time == 0) { 6175 config_task_suspended = B_FALSE; 6176 } else { 6177 config_task_suspended = 6178 (gethrtime() - spa->spa_ccw_fail_time) < 6179 (zfs_ccw_retry_interval * NANOSEC); 6180 } 6181 6182 return (non_config_tasks || (config_task && !config_task_suspended)); 6183} 6184 6185static void 6186spa_async_dispatch(spa_t *spa) 6187{ 6188 mutex_enter(&spa->spa_async_lock); 6189 if (spa_async_tasks_pending(spa) && 6190 !spa->spa_async_suspended && 6191 spa->spa_async_thread == NULL && 6192 rootdir != NULL) 6193 spa->spa_async_thread = thread_create(NULL, 0, 6194 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 6195 mutex_exit(&spa->spa_async_lock); 6196} 6197 6198static void 6199spa_async_dispatch_vd(spa_t *spa) 6200{ 6201 mutex_enter(&spa->spa_async_lock); 6202 if ((spa->spa_async_tasks & SPA_ASYNC_REMOVE) != 0 && 6203 !spa->spa_async_suspended && 6204 spa->spa_async_thread_vd == NULL && 6205 rootdir != NULL) 6206 spa->spa_async_thread_vd = thread_create(NULL, 0, 6207 spa_async_thread_vd, spa, 0, &p0, TS_RUN, maxclsyspri); 6208 mutex_exit(&spa->spa_async_lock); 6209} 6210 6211void 6212spa_async_request(spa_t *spa, int task) 6213{ 6214 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 6215 mutex_enter(&spa->spa_async_lock); 6216 spa->spa_async_tasks |= task; 6217 mutex_exit(&spa->spa_async_lock); 6218 spa_async_dispatch_vd(spa); 6219} 6220 6221/* 6222 * ========================================================================== 6223 * SPA syncing routines 6224 * ========================================================================== 6225 */ 6226 6227static int 6228bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6229{ 6230 bpobj_t *bpo = arg; 6231 bpobj_enqueue(bpo, bp, tx); 6232 return (0); 6233} 6234 6235static int 6236spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6237{ 6238 zio_t *zio = arg; 6239 6240 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 6241 BP_GET_PSIZE(bp), zio->io_flags)); 6242 return (0); 6243} 6244 6245/* 6246 * Note: this simple function is not inlined to make it easier to dtrace the 6247 * amount of time spent syncing frees. 6248 */ 6249static void 6250spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 6251{ 6252 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6253 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 6254 VERIFY(zio_wait(zio) == 0); 6255} 6256 6257/* 6258 * Note: this simple function is not inlined to make it easier to dtrace the 6259 * amount of time spent syncing deferred frees. 6260 */ 6261static void 6262spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 6263{ 6264 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6265 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 6266 spa_free_sync_cb, zio, tx), ==, 0); 6267 VERIFY0(zio_wait(zio)); 6268} 6269 6270 6271static void 6272spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 6273{ 6274 char *packed = NULL; 6275 size_t bufsize; 6276 size_t nvsize = 0; 6277 dmu_buf_t *db; 6278 6279 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 6280 6281 /* 6282 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 6283 * information. This avoids the dmu_buf_will_dirty() path and 6284 * saves us a pre-read to get data we don't actually care about. 6285 */ 6286 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 6287 packed = kmem_alloc(bufsize, KM_SLEEP); 6288 6289 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 6290 KM_SLEEP) == 0); 6291 bzero(packed + nvsize, bufsize - nvsize); 6292 6293 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 6294 6295 kmem_free(packed, bufsize); 6296 6297 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 6298 dmu_buf_will_dirty(db, tx); 6299 *(uint64_t *)db->db_data = nvsize; 6300 dmu_buf_rele(db, FTAG); 6301} 6302 6303static void 6304spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 6305 const char *config, const char *entry) 6306{ 6307 nvlist_t *nvroot; 6308 nvlist_t **list; 6309 int i; 6310 6311 if (!sav->sav_sync) 6312 return; 6313 6314 /* 6315 * Update the MOS nvlist describing the list of available devices. 6316 * spa_validate_aux() will have already made sure this nvlist is 6317 * valid and the vdevs are labeled appropriately. 6318 */ 6319 if (sav->sav_object == 0) { 6320 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 6321 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 6322 sizeof (uint64_t), tx); 6323 VERIFY(zap_update(spa->spa_meta_objset, 6324 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 6325 &sav->sav_object, tx) == 0); 6326 } 6327 6328 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6329 if (sav->sav_count == 0) { 6330 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 6331 } else { 6332 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 6333 for (i = 0; i < sav->sav_count; i++) 6334 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 6335 B_FALSE, VDEV_CONFIG_L2CACHE); 6336 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 6337 sav->sav_count) == 0); 6338 for (i = 0; i < sav->sav_count; i++) 6339 nvlist_free(list[i]); 6340 kmem_free(list, sav->sav_count * sizeof (void *)); 6341 } 6342 6343 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 6344 nvlist_free(nvroot); 6345 6346 sav->sav_sync = B_FALSE; 6347} 6348 6349static void 6350spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 6351{ 6352 nvlist_t *config; 6353 6354 if (list_is_empty(&spa->spa_config_dirty_list)) 6355 return; 6356 6357 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6358 6359 config = spa_config_generate(spa, spa->spa_root_vdev, 6360 dmu_tx_get_txg(tx), B_FALSE); 6361 6362 /* 6363 * If we're upgrading the spa version then make sure that 6364 * the config object gets updated with the correct version. 6365 */ 6366 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 6367 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6368 spa->spa_uberblock.ub_version); 6369 6370 spa_config_exit(spa, SCL_STATE, FTAG); 6371 6372 nvlist_free(spa->spa_config_syncing); 6373 spa->spa_config_syncing = config; 6374 6375 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 6376} 6377 6378static void 6379spa_sync_version(void *arg, dmu_tx_t *tx) 6380{ 6381 uint64_t *versionp = arg; 6382 uint64_t version = *versionp; 6383 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6384 6385 /* 6386 * Setting the version is special cased when first creating the pool. 6387 */ 6388 ASSERT(tx->tx_txg != TXG_INITIAL); 6389 6390 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 6391 ASSERT(version >= spa_version(spa)); 6392 6393 spa->spa_uberblock.ub_version = version; 6394 vdev_config_dirty(spa->spa_root_vdev); 6395 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 6396} 6397 6398/* 6399 * Set zpool properties. 6400 */ 6401static void 6402spa_sync_props(void *arg, dmu_tx_t *tx) 6403{ 6404 nvlist_t *nvp = arg; 6405 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6406 objset_t *mos = spa->spa_meta_objset; 6407 nvpair_t *elem = NULL; 6408 6409 mutex_enter(&spa->spa_props_lock); 6410 6411 while ((elem = nvlist_next_nvpair(nvp, elem))) { 6412 uint64_t intval; 6413 char *strval, *fname; 6414 zpool_prop_t prop; 6415 const char *propname; 6416 zprop_type_t proptype; 6417 spa_feature_t fid; 6418 6419 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 6420 case ZPROP_INVAL: 6421 /* 6422 * We checked this earlier in spa_prop_validate(). 6423 */ 6424 ASSERT(zpool_prop_feature(nvpair_name(elem))); 6425 6426 fname = strchr(nvpair_name(elem), '@') + 1; 6427 VERIFY0(zfeature_lookup_name(fname, &fid)); 6428 6429 spa_feature_enable(spa, fid, tx); 6430 spa_history_log_internal(spa, "set", tx, 6431 "%s=enabled", nvpair_name(elem)); 6432 break; 6433 6434 case ZPOOL_PROP_VERSION: 6435 intval = fnvpair_value_uint64(elem); 6436 /* 6437 * The version is synced seperatly before other 6438 * properties and should be correct by now. 6439 */ 6440 ASSERT3U(spa_version(spa), >=, intval); 6441 break; 6442 6443 case ZPOOL_PROP_ALTROOT: 6444 /* 6445 * 'altroot' is a non-persistent property. It should 6446 * have been set temporarily at creation or import time. 6447 */ 6448 ASSERT(spa->spa_root != NULL); 6449 break; 6450 6451 case ZPOOL_PROP_READONLY: 6452 case ZPOOL_PROP_CACHEFILE: 6453 /* 6454 * 'readonly' and 'cachefile' are also non-persisitent 6455 * properties. 6456 */ 6457 break; 6458 case ZPOOL_PROP_COMMENT: 6459 strval = fnvpair_value_string(elem); 6460 if (spa->spa_comment != NULL) 6461 spa_strfree(spa->spa_comment); 6462 spa->spa_comment = spa_strdup(strval); 6463 /* 6464 * We need to dirty the configuration on all the vdevs 6465 * so that their labels get updated. It's unnecessary 6466 * to do this for pool creation since the vdev's 6467 * configuratoin has already been dirtied. 6468 */ 6469 if (tx->tx_txg != TXG_INITIAL) 6470 vdev_config_dirty(spa->spa_root_vdev); 6471 spa_history_log_internal(spa, "set", tx, 6472 "%s=%s", nvpair_name(elem), strval); 6473 break; 6474 default: 6475 /* 6476 * Set pool property values in the poolprops mos object. 6477 */ 6478 if (spa->spa_pool_props_object == 0) { 6479 spa->spa_pool_props_object = 6480 zap_create_link(mos, DMU_OT_POOL_PROPS, 6481 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 6482 tx); 6483 } 6484 6485 /* normalize the property name */ 6486 propname = zpool_prop_to_name(prop); 6487 proptype = zpool_prop_get_type(prop); 6488 6489 if (nvpair_type(elem) == DATA_TYPE_STRING) { 6490 ASSERT(proptype == PROP_TYPE_STRING); 6491 strval = fnvpair_value_string(elem); 6492 VERIFY0(zap_update(mos, 6493 spa->spa_pool_props_object, propname, 6494 1, strlen(strval) + 1, strval, tx)); 6495 spa_history_log_internal(spa, "set", tx, 6496 "%s=%s", nvpair_name(elem), strval); 6497 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 6498 intval = fnvpair_value_uint64(elem); 6499 6500 if (proptype == PROP_TYPE_INDEX) { 6501 const char *unused; 6502 VERIFY0(zpool_prop_index_to_string( 6503 prop, intval, &unused)); 6504 } 6505 VERIFY0(zap_update(mos, 6506 spa->spa_pool_props_object, propname, 6507 8, 1, &intval, tx)); 6508 spa_history_log_internal(spa, "set", tx, 6509 "%s=%lld", nvpair_name(elem), intval); 6510 } else { 6511 ASSERT(0); /* not allowed */ 6512 } 6513 6514 switch (prop) { 6515 case ZPOOL_PROP_DELEGATION: 6516 spa->spa_delegation = intval; 6517 break; 6518 case ZPOOL_PROP_BOOTFS: 6519 spa->spa_bootfs = intval; 6520 break; 6521 case ZPOOL_PROP_FAILUREMODE: 6522 spa->spa_failmode = intval; 6523 break; 6524 case ZPOOL_PROP_AUTOEXPAND: 6525 spa->spa_autoexpand = intval; 6526 if (tx->tx_txg != TXG_INITIAL) 6527 spa_async_request(spa, 6528 SPA_ASYNC_AUTOEXPAND); 6529 break; 6530 case ZPOOL_PROP_DEDUPDITTO: 6531 spa->spa_dedup_ditto = intval; 6532 break; 6533 default: 6534 break; 6535 } 6536 } 6537 6538 } 6539 6540 mutex_exit(&spa->spa_props_lock); 6541} 6542 6543/* 6544 * Perform one-time upgrade on-disk changes. spa_version() does not 6545 * reflect the new version this txg, so there must be no changes this 6546 * txg to anything that the upgrade code depends on after it executes. 6547 * Therefore this must be called after dsl_pool_sync() does the sync 6548 * tasks. 6549 */ 6550static void 6551spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 6552{ 6553 dsl_pool_t *dp = spa->spa_dsl_pool; 6554 6555 ASSERT(spa->spa_sync_pass == 1); 6556 6557 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 6558 6559 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 6560 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 6561 dsl_pool_create_origin(dp, tx); 6562 6563 /* Keeping the origin open increases spa_minref */ 6564 spa->spa_minref += 3; 6565 } 6566 6567 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 6568 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 6569 dsl_pool_upgrade_clones(dp, tx); 6570 } 6571 6572 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 6573 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 6574 dsl_pool_upgrade_dir_clones(dp, tx); 6575 6576 /* Keeping the freedir open increases spa_minref */ 6577 spa->spa_minref += 3; 6578 } 6579 6580 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 6581 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6582 spa_feature_create_zap_objects(spa, tx); 6583 } 6584 6585 /* 6586 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 6587 * when possibility to use lz4 compression for metadata was added 6588 * Old pools that have this feature enabled must be upgraded to have 6589 * this feature active 6590 */ 6591 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6592 boolean_t lz4_en = spa_feature_is_enabled(spa, 6593 SPA_FEATURE_LZ4_COMPRESS); 6594 boolean_t lz4_ac = spa_feature_is_active(spa, 6595 SPA_FEATURE_LZ4_COMPRESS); 6596 6597 if (lz4_en && !lz4_ac) 6598 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 6599 } 6600 6601 /* 6602 * If we haven't written the salt, do so now. Note that the 6603 * feature may not be activated yet, but that's fine since 6604 * the presence of this ZAP entry is backwards compatible. 6605 */ 6606 if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 6607 DMU_POOL_CHECKSUM_SALT) == ENOENT) { 6608 VERIFY0(zap_add(spa->spa_meta_objset, 6609 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, 6610 sizeof (spa->spa_cksum_salt.zcs_bytes), 6611 spa->spa_cksum_salt.zcs_bytes, tx)); 6612 } 6613 6614 rrw_exit(&dp->dp_config_rwlock, FTAG); 6615} 6616 6617/* 6618 * Sync the specified transaction group. New blocks may be dirtied as 6619 * part of the process, so we iterate until it converges. 6620 */ 6621void 6622spa_sync(spa_t *spa, uint64_t txg) 6623{ 6624 dsl_pool_t *dp = spa->spa_dsl_pool; 6625 objset_t *mos = spa->spa_meta_objset; 6626 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 6627 vdev_t *rvd = spa->spa_root_vdev; 6628 vdev_t *vd; 6629 dmu_tx_t *tx; 6630 int error; 6631 6632 VERIFY(spa_writeable(spa)); 6633 6634 /* 6635 * Lock out configuration changes. 6636 */ 6637 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6638 6639 spa->spa_syncing_txg = txg; 6640 spa->spa_sync_pass = 0; 6641 6642 /* 6643 * If there are any pending vdev state changes, convert them 6644 * into config changes that go out with this transaction group. 6645 */ 6646 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6647 while (list_head(&spa->spa_state_dirty_list) != NULL) { 6648 /* 6649 * We need the write lock here because, for aux vdevs, 6650 * calling vdev_config_dirty() modifies sav_config. 6651 * This is ugly and will become unnecessary when we 6652 * eliminate the aux vdev wart by integrating all vdevs 6653 * into the root vdev tree. 6654 */ 6655 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6656 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 6657 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 6658 vdev_state_clean(vd); 6659 vdev_config_dirty(vd); 6660 } 6661 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6662 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 6663 } 6664 spa_config_exit(spa, SCL_STATE, FTAG); 6665 6666 tx = dmu_tx_create_assigned(dp, txg); 6667 6668 spa->spa_sync_starttime = gethrtime(); 6669#ifdef illumos 6670 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 6671 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 6672#else /* !illumos */ 6673#ifdef _KERNEL 6674 callout_reset(&spa->spa_deadman_cycid, 6675 hz * spa->spa_deadman_synctime / NANOSEC, spa_deadman, spa); 6676#endif 6677#endif /* illumos */ 6678 6679 /* 6680 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 6681 * set spa_deflate if we have no raid-z vdevs. 6682 */ 6683 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 6684 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 6685 int i; 6686 6687 for (i = 0; i < rvd->vdev_children; i++) { 6688 vd = rvd->vdev_child[i]; 6689 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 6690 break; 6691 } 6692 if (i == rvd->vdev_children) { 6693 spa->spa_deflate = TRUE; 6694 VERIFY(0 == zap_add(spa->spa_meta_objset, 6695 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 6696 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 6697 } 6698 } 6699 6700 /* 6701 * Iterate to convergence. 6702 */ 6703 do { 6704 int pass = ++spa->spa_sync_pass; 6705 6706 spa_sync_config_object(spa, tx); 6707 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 6708 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 6709 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 6710 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 6711 spa_errlog_sync(spa, txg); 6712 dsl_pool_sync(dp, txg); 6713 6714 if (pass < zfs_sync_pass_deferred_free) { 6715 spa_sync_frees(spa, free_bpl, tx); 6716 } else { 6717 /* 6718 * We can not defer frees in pass 1, because 6719 * we sync the deferred frees later in pass 1. 6720 */ 6721 ASSERT3U(pass, >, 1); 6722 bplist_iterate(free_bpl, bpobj_enqueue_cb, 6723 &spa->spa_deferred_bpobj, tx); 6724 } 6725 6726 ddt_sync(spa, txg); 6727 dsl_scan_sync(dp, tx); 6728 6729 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 6730 vdev_sync(vd, txg); 6731 6732 if (pass == 1) { 6733 spa_sync_upgrades(spa, tx); 6734 ASSERT3U(txg, >=, 6735 spa->spa_uberblock.ub_rootbp.blk_birth); 6736 /* 6737 * Note: We need to check if the MOS is dirty 6738 * because we could have marked the MOS dirty 6739 * without updating the uberblock (e.g. if we 6740 * have sync tasks but no dirty user data). We 6741 * need to check the uberblock's rootbp because 6742 * it is updated if we have synced out dirty 6743 * data (though in this case the MOS will most 6744 * likely also be dirty due to second order 6745 * effects, we don't want to rely on that here). 6746 */ 6747 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 6748 !dmu_objset_is_dirty(mos, txg)) { 6749 /* 6750 * Nothing changed on the first pass, 6751 * therefore this TXG is a no-op. Avoid 6752 * syncing deferred frees, so that we 6753 * can keep this TXG as a no-op. 6754 */ 6755 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 6756 txg)); 6757 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6758 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 6759 break; 6760 } 6761 spa_sync_deferred_frees(spa, tx); 6762 } 6763 6764 } while (dmu_objset_is_dirty(mos, txg)); 6765 6766 /* 6767 * Rewrite the vdev configuration (which includes the uberblock) 6768 * to commit the transaction group. 6769 * 6770 * If there are no dirty vdevs, we sync the uberblock to a few 6771 * random top-level vdevs that are known to be visible in the 6772 * config cache (see spa_vdev_add() for a complete description). 6773 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 6774 */ 6775 for (;;) { 6776 /* 6777 * We hold SCL_STATE to prevent vdev open/close/etc. 6778 * while we're attempting to write the vdev labels. 6779 */ 6780 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6781 6782 if (list_is_empty(&spa->spa_config_dirty_list)) { 6783 vdev_t *svd[SPA_DVAS_PER_BP]; 6784 int svdcount = 0; 6785 int children = rvd->vdev_children; 6786 int c0 = spa_get_random(children); 6787 6788 for (int c = 0; c < children; c++) { 6789 vd = rvd->vdev_child[(c0 + c) % children]; 6790 if (vd->vdev_ms_array == 0 || vd->vdev_islog) 6791 continue; 6792 svd[svdcount++] = vd; 6793 if (svdcount == SPA_DVAS_PER_BP) 6794 break; 6795 } 6796 error = vdev_config_sync(svd, svdcount, txg); 6797 } else { 6798 error = vdev_config_sync(rvd->vdev_child, 6799 rvd->vdev_children, txg); 6800 } 6801 6802 if (error == 0) 6803 spa->spa_last_synced_guid = rvd->vdev_guid; 6804 6805 spa_config_exit(spa, SCL_STATE, FTAG); 6806 6807 if (error == 0) 6808 break; 6809 zio_suspend(spa, NULL); 6810 zio_resume_wait(spa); 6811 } 6812 dmu_tx_commit(tx); 6813 6814#ifdef illumos 6815 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 6816#else /* !illumos */ 6817#ifdef _KERNEL 6818 callout_drain(&spa->spa_deadman_cycid); 6819#endif 6820#endif /* illumos */ 6821 6822 /* 6823 * Clear the dirty config list. 6824 */ 6825 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 6826 vdev_config_clean(vd); 6827 6828 /* 6829 * Now that the new config has synced transactionally, 6830 * let it become visible to the config cache. 6831 */ 6832 if (spa->spa_config_syncing != NULL) { 6833 spa_config_set(spa, spa->spa_config_syncing); 6834 spa->spa_config_txg = txg; 6835 spa->spa_config_syncing = NULL; 6836 } 6837 6838 spa->spa_ubsync = spa->spa_uberblock; 6839 6840 dsl_pool_sync_done(dp, txg); 6841 6842 /* 6843 * Update usable space statistics. 6844 */ 6845 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 6846 vdev_sync_done(vd, txg); 6847 6848 spa_update_dspace(spa); 6849 6850 /* 6851 * It had better be the case that we didn't dirty anything 6852 * since vdev_config_sync(). 6853 */ 6854 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 6855 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6856 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 6857 6858 spa->spa_sync_pass = 0; 6859 6860 spa_config_exit(spa, SCL_CONFIG, FTAG); 6861 6862 spa_handle_ignored_writes(spa); 6863 6864 /* 6865 * If any async tasks have been requested, kick them off. 6866 */ 6867 spa_async_dispatch(spa); 6868 spa_async_dispatch_vd(spa); 6869} 6870 6871/* 6872 * Sync all pools. We don't want to hold the namespace lock across these 6873 * operations, so we take a reference on the spa_t and drop the lock during the 6874 * sync. 6875 */ 6876void 6877spa_sync_allpools(void) 6878{ 6879 spa_t *spa = NULL; 6880 mutex_enter(&spa_namespace_lock); 6881 while ((spa = spa_next(spa)) != NULL) { 6882 if (spa_state(spa) != POOL_STATE_ACTIVE || 6883 !spa_writeable(spa) || spa_suspended(spa)) 6884 continue; 6885 spa_open_ref(spa, FTAG); 6886 mutex_exit(&spa_namespace_lock); 6887 txg_wait_synced(spa_get_dsl(spa), 0); 6888 mutex_enter(&spa_namespace_lock); 6889 spa_close(spa, FTAG); 6890 } 6891 mutex_exit(&spa_namespace_lock); 6892} 6893 6894/* 6895 * ========================================================================== 6896 * Miscellaneous routines 6897 * ========================================================================== 6898 */ 6899 6900/* 6901 * Remove all pools in the system. 6902 */ 6903void 6904spa_evict_all(void) 6905{ 6906 spa_t *spa; 6907 6908 /* 6909 * Remove all cached state. All pools should be closed now, 6910 * so every spa in the AVL tree should be unreferenced. 6911 */ 6912 mutex_enter(&spa_namespace_lock); 6913 while ((spa = spa_next(NULL)) != NULL) { 6914 /* 6915 * Stop async tasks. The async thread may need to detach 6916 * a device that's been replaced, which requires grabbing 6917 * spa_namespace_lock, so we must drop it here. 6918 */ 6919 spa_open_ref(spa, FTAG); 6920 mutex_exit(&spa_namespace_lock); 6921 spa_async_suspend(spa); 6922 mutex_enter(&spa_namespace_lock); 6923 spa_close(spa, FTAG); 6924 6925 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 6926 spa_unload(spa); 6927 spa_deactivate(spa); 6928 } 6929 spa_remove(spa); 6930 } 6931 mutex_exit(&spa_namespace_lock); 6932} 6933 6934vdev_t * 6935spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 6936{ 6937 vdev_t *vd; 6938 int i; 6939 6940 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 6941 return (vd); 6942 6943 if (aux) { 6944 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 6945 vd = spa->spa_l2cache.sav_vdevs[i]; 6946 if (vd->vdev_guid == guid) 6947 return (vd); 6948 } 6949 6950 for (i = 0; i < spa->spa_spares.sav_count; i++) { 6951 vd = spa->spa_spares.sav_vdevs[i]; 6952 if (vd->vdev_guid == guid) 6953 return (vd); 6954 } 6955 } 6956 6957 return (NULL); 6958} 6959 6960void 6961spa_upgrade(spa_t *spa, uint64_t version) 6962{ 6963 ASSERT(spa_writeable(spa)); 6964 6965 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6966 6967 /* 6968 * This should only be called for a non-faulted pool, and since a 6969 * future version would result in an unopenable pool, this shouldn't be 6970 * possible. 6971 */ 6972 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 6973 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 6974 6975 spa->spa_uberblock.ub_version = version; 6976 vdev_config_dirty(spa->spa_root_vdev); 6977 6978 spa_config_exit(spa, SCL_ALL, FTAG); 6979 6980 txg_wait_synced(spa_get_dsl(spa), 0); 6981} 6982 6983boolean_t 6984spa_has_spare(spa_t *spa, uint64_t guid) 6985{ 6986 int i; 6987 uint64_t spareguid; 6988 spa_aux_vdev_t *sav = &spa->spa_spares; 6989 6990 for (i = 0; i < sav->sav_count; i++) 6991 if (sav->sav_vdevs[i]->vdev_guid == guid) 6992 return (B_TRUE); 6993 6994 for (i = 0; i < sav->sav_npending; i++) { 6995 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 6996 &spareguid) == 0 && spareguid == guid) 6997 return (B_TRUE); 6998 } 6999 7000 return (B_FALSE); 7001} 7002 7003/* 7004 * Check if a pool has an active shared spare device. 7005 * Note: reference count of an active spare is 2, as a spare and as a replace 7006 */ 7007static boolean_t 7008spa_has_active_shared_spare(spa_t *spa) 7009{ 7010 int i, refcnt; 7011 uint64_t pool; 7012 spa_aux_vdev_t *sav = &spa->spa_spares; 7013 7014 for (i = 0; i < sav->sav_count; i++) { 7015 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 7016 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 7017 refcnt > 2) 7018 return (B_TRUE); 7019 } 7020 7021 return (B_FALSE); 7022} 7023 7024/* 7025 * Post a sysevent corresponding to the given event. The 'name' must be one of 7026 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 7027 * filled in from the spa and (optionally) the vdev. This doesn't do anything 7028 * in the userland libzpool, as we don't want consumers to misinterpret ztest 7029 * or zdb as real changes. 7030 */ 7031void 7032spa_event_notify(spa_t *spa, vdev_t *vd, const char *name) 7033{ 7034#ifdef _KERNEL 7035 sysevent_t *ev; 7036 sysevent_attr_list_t *attr = NULL; 7037 sysevent_value_t value; 7038 sysevent_id_t eid; 7039 7040 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 7041 SE_SLEEP); 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 7073 (void) log_sysevent(ev, SE_SLEEP, &eid); 7074 7075done: 7076 if (attr) 7077 sysevent_free_attr(attr); 7078 sysevent_free(ev); 7079#endif 7080} 7081