spa.c revision 339153
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2018 by Delphix. All rights reserved. 25 * Copyright (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 * Copyright 2016 Toomas Soome <tsoome@me.com> 31 * Copyright 2018 Joyent, Inc. 32 * Copyright (c) 2017 Datto Inc. 33 * Copyright 2018 OmniOS Community Edition (OmniOSce) Association. 34 */ 35 36/* 37 * SPA: Storage Pool Allocator 38 * 39 * This file contains all the routines used when modifying on-disk SPA state. 40 * This includes opening, importing, destroying, exporting a pool, and syncing a 41 * pool. 42 */ 43 44#include <sys/zfs_context.h> 45#include <sys/fm/fs/zfs.h> 46#include <sys/spa_impl.h> 47#include <sys/zio.h> 48#include <sys/zio_checksum.h> 49#include <sys/dmu.h> 50#include <sys/dmu_tx.h> 51#include <sys/zap.h> 52#include <sys/zil.h> 53#include <sys/ddt.h> 54#include <sys/vdev_impl.h> 55#include <sys/vdev_removal.h> 56#include <sys/vdev_indirect_mapping.h> 57#include <sys/vdev_indirect_births.h> 58#include <sys/vdev_initialize.h> 59#include <sys/metaslab.h> 60#include <sys/metaslab_impl.h> 61#include <sys/uberblock_impl.h> 62#include <sys/txg.h> 63#include <sys/avl.h> 64#include <sys/bpobj.h> 65#include <sys/dmu_traverse.h> 66#include <sys/dmu_objset.h> 67#include <sys/unique.h> 68#include <sys/dsl_pool.h> 69#include <sys/dsl_dataset.h> 70#include <sys/dsl_dir.h> 71#include <sys/dsl_prop.h> 72#include <sys/dsl_synctask.h> 73#include <sys/fs/zfs.h> 74#include <sys/arc.h> 75#include <sys/callb.h> 76#include <sys/spa_boot.h> 77#include <sys/zfs_ioctl.h> 78#include <sys/dsl_scan.h> 79#include <sys/dmu_send.h> 80#include <sys/dsl_destroy.h> 81#include <sys/dsl_userhold.h> 82#include <sys/zfeature.h> 83#include <sys/zvol.h> 84#include <sys/trim_map.h> 85#include <sys/abd.h> 86 87#ifdef _KERNEL 88#include <sys/callb.h> 89#include <sys/cpupart.h> 90#include <sys/zone.h> 91#endif /* _KERNEL */ 92 93#include "zfs_prop.h" 94#include "zfs_comutil.h" 95 96/* Check hostid on import? */ 97static int check_hostid = 1; 98 99/* 100 * The interval, in seconds, at which failed configuration cache file writes 101 * should be retried. 102 */ 103int zfs_ccw_retry_interval = 300; 104 105SYSCTL_DECL(_vfs_zfs); 106SYSCTL_INT(_vfs_zfs, OID_AUTO, check_hostid, CTLFLAG_RWTUN, &check_hostid, 0, 107 "Check hostid on import?"); 108TUNABLE_INT("vfs.zfs.ccw_retry_interval", &zfs_ccw_retry_interval); 109SYSCTL_INT(_vfs_zfs, OID_AUTO, ccw_retry_interval, CTLFLAG_RW, 110 &zfs_ccw_retry_interval, 0, 111 "Configuration cache file write, retry after failure, interval (seconds)"); 112 113typedef enum zti_modes { 114 ZTI_MODE_FIXED, /* value is # of threads (min 1) */ 115 ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ 116 ZTI_MODE_NULL, /* don't create a taskq */ 117 ZTI_NMODES 118} zti_modes_t; 119 120#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } 121#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } 122#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } 123 124#define ZTI_N(n) ZTI_P(n, 1) 125#define ZTI_ONE ZTI_N(1) 126 127typedef struct zio_taskq_info { 128 zti_modes_t zti_mode; 129 uint_t zti_value; 130 uint_t zti_count; 131} zio_taskq_info_t; 132 133static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { 134 "issue", "issue_high", "intr", "intr_high" 135}; 136 137/* 138 * This table defines the taskq settings for each ZFS I/O type. When 139 * initializing a pool, we use this table to create an appropriately sized 140 * taskq. Some operations are low volume and therefore have a small, static 141 * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE 142 * macros. Other operations process a large amount of data; the ZTI_BATCH 143 * macro causes us to create a taskq oriented for throughput. Some operations 144 * are so high frequency and short-lived that the taskq itself can become a a 145 * point of lock contention. The ZTI_P(#, #) macro indicates that we need an 146 * additional degree of parallelism specified by the number of threads per- 147 * taskq and the number of taskqs; when dispatching an event in this case, the 148 * particular taskq is chosen at random. 149 * 150 * The different taskq priorities are to handle the different contexts (issue 151 * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that 152 * need to be handled with minimum delay. 153 */ 154const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { 155 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ 156 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ 157 { ZTI_N(8), ZTI_NULL, ZTI_P(12, 8), ZTI_NULL }, /* READ */ 158 { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ 159 { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ 160 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ 161 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ 162}; 163 164static void spa_sync_version(void *arg, dmu_tx_t *tx); 165static void spa_sync_props(void *arg, dmu_tx_t *tx); 166static boolean_t spa_has_active_shared_spare(spa_t *spa); 167static int spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport); 168static void spa_vdev_resilver_done(spa_t *spa); 169 170uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 171#ifdef PSRSET_BIND 172id_t zio_taskq_psrset_bind = PS_NONE; 173#endif 174#ifdef SYSDC 175boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 176uint_t zio_taskq_basedc = 80; /* base duty cycle */ 177#endif 178 179boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 180extern int zfs_sync_pass_deferred_free; 181 182/* 183 * Report any spa_load_verify errors found, but do not fail spa_load. 184 * This is used by zdb to analyze non-idle pools. 185 */ 186boolean_t spa_load_verify_dryrun = B_FALSE; 187 188/* 189 * This (illegal) pool name is used when temporarily importing a spa_t in order 190 * to get the vdev stats associated with the imported devices. 191 */ 192#define TRYIMPORT_NAME "$import" 193 194/* 195 * For debugging purposes: print out vdev tree during pool import. 196 */ 197int spa_load_print_vdev_tree = B_FALSE; 198 199/* 200 * A non-zero value for zfs_max_missing_tvds means that we allow importing 201 * pools with missing top-level vdevs. This is strictly intended for advanced 202 * pool recovery cases since missing data is almost inevitable. Pools with 203 * missing devices can only be imported read-only for safety reasons, and their 204 * fail-mode will be automatically set to "continue". 205 * 206 * With 1 missing vdev we should be able to import the pool and mount all 207 * datasets. User data that was not modified after the missing device has been 208 * added should be recoverable. This means that snapshots created prior to the 209 * addition of that device should be completely intact. 210 * 211 * With 2 missing vdevs, some datasets may fail to mount since there are 212 * dataset statistics that are stored as regular metadata. Some data might be 213 * recoverable if those vdevs were added recently. 214 * 215 * With 3 or more missing vdevs, the pool is severely damaged and MOS entries 216 * may be missing entirely. Chances of data recovery are very low. Note that 217 * there are also risks of performing an inadvertent rewind as we might be 218 * missing all the vdevs with the latest uberblocks. 219 */ 220uint64_t zfs_max_missing_tvds = 0; 221 222/* 223 * The parameters below are similar to zfs_max_missing_tvds but are only 224 * intended for a preliminary open of the pool with an untrusted config which 225 * might be incomplete or out-dated. 226 * 227 * We are more tolerant for pools opened from a cachefile since we could have 228 * an out-dated cachefile where a device removal was not registered. 229 * We could have set the limit arbitrarily high but in the case where devices 230 * are really missing we would want to return the proper error codes; we chose 231 * SPA_DVAS_PER_BP - 1 so that some copies of the MOS would still be available 232 * and we get a chance to retrieve the trusted config. 233 */ 234uint64_t zfs_max_missing_tvds_cachefile = SPA_DVAS_PER_BP - 1; 235 236/* 237 * In the case where config was assembled by scanning device paths (/dev/dsks 238 * by default) we are less tolerant since all the existing devices should have 239 * been detected and we want spa_load to return the right error codes. 240 */ 241uint64_t zfs_max_missing_tvds_scan = 0; 242 243 244SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_print_vdev_tree, CTLFLAG_RWTUN, 245 &spa_load_print_vdev_tree, 0, 246 "print out vdev tree during pool import"); 247SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds, CTLFLAG_RWTUN, 248 &zfs_max_missing_tvds, 0, 249 "allow importing pools with missing top-level vdevs"); 250SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds_cachefile, CTLFLAG_RWTUN, 251 &zfs_max_missing_tvds_cachefile, 0, 252 "allow importing pools with missing top-level vdevs in cache file"); 253SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds_scan, CTLFLAG_RWTUN, 254 &zfs_max_missing_tvds_scan, 0, 255 "allow importing pools with missing top-level vdevs during scan"); 256 257/* 258 * Debugging aid that pauses spa_sync() towards the end. 259 */ 260boolean_t zfs_pause_spa_sync = B_FALSE; 261 262/* 263 * ========================================================================== 264 * SPA properties routines 265 * ========================================================================== 266 */ 267 268/* 269 * Add a (source=src, propname=propval) list to an nvlist. 270 */ 271static void 272spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 273 uint64_t intval, zprop_source_t src) 274{ 275 const char *propname = zpool_prop_to_name(prop); 276 nvlist_t *propval; 277 278 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 279 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 280 281 if (strval != NULL) 282 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 283 else 284 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 285 286 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 287 nvlist_free(propval); 288} 289 290/* 291 * Get property values from the spa configuration. 292 */ 293static void 294spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 295{ 296 vdev_t *rvd = spa->spa_root_vdev; 297 dsl_pool_t *pool = spa->spa_dsl_pool; 298 uint64_t size, alloc, cap, version; 299 zprop_source_t src = ZPROP_SRC_NONE; 300 spa_config_dirent_t *dp; 301 metaslab_class_t *mc = spa_normal_class(spa); 302 303 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 304 305 if (rvd != NULL) { 306 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 307 size = metaslab_class_get_space(spa_normal_class(spa)); 308 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 309 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 310 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 311 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 312 size - alloc, src); 313 spa_prop_add_list(*nvp, ZPOOL_PROP_CHECKPOINT, NULL, 314 spa->spa_checkpoint_info.sci_dspace, src); 315 316 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 317 metaslab_class_fragmentation(mc), src); 318 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 319 metaslab_class_expandable_space(mc), src); 320 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 321 (spa_mode(spa) == FREAD), src); 322 323 cap = (size == 0) ? 0 : (alloc * 100 / size); 324 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 325 326 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 327 ddt_get_pool_dedup_ratio(spa), src); 328 329 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 330 rvd->vdev_state, src); 331 332 version = spa_version(spa); 333 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 334 src = ZPROP_SRC_DEFAULT; 335 else 336 src = ZPROP_SRC_LOCAL; 337 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 338 } 339 340 if (pool != NULL) { 341 /* 342 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 343 * when opening pools before this version freedir will be NULL. 344 */ 345 if (pool->dp_free_dir != NULL) { 346 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 347 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 348 src); 349 } else { 350 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 351 NULL, 0, src); 352 } 353 354 if (pool->dp_leak_dir != NULL) { 355 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 356 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 357 src); 358 } else { 359 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 360 NULL, 0, src); 361 } 362 } 363 364 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 365 366 if (spa->spa_comment != NULL) { 367 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 368 0, ZPROP_SRC_LOCAL); 369 } 370 371 if (spa->spa_root != NULL) 372 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 373 0, ZPROP_SRC_LOCAL); 374 375 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 376 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 377 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 378 } else { 379 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 380 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 381 } 382 383 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 384 if (dp->scd_path == NULL) { 385 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 386 "none", 0, ZPROP_SRC_LOCAL); 387 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 388 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 389 dp->scd_path, 0, ZPROP_SRC_LOCAL); 390 } 391 } 392} 393 394/* 395 * Get zpool property values. 396 */ 397int 398spa_prop_get(spa_t *spa, nvlist_t **nvp) 399{ 400 objset_t *mos = spa->spa_meta_objset; 401 zap_cursor_t zc; 402 zap_attribute_t za; 403 int err; 404 405 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 406 407 mutex_enter(&spa->spa_props_lock); 408 409 /* 410 * Get properties from the spa config. 411 */ 412 spa_prop_get_config(spa, nvp); 413 414 /* If no pool property object, no more prop to get. */ 415 if (mos == NULL || spa->spa_pool_props_object == 0) { 416 mutex_exit(&spa->spa_props_lock); 417 return (0); 418 } 419 420 /* 421 * Get properties from the MOS pool property object. 422 */ 423 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 424 (err = zap_cursor_retrieve(&zc, &za)) == 0; 425 zap_cursor_advance(&zc)) { 426 uint64_t intval = 0; 427 char *strval = NULL; 428 zprop_source_t src = ZPROP_SRC_DEFAULT; 429 zpool_prop_t prop; 430 431 if ((prop = zpool_name_to_prop(za.za_name)) == ZPOOL_PROP_INVAL) 432 continue; 433 434 switch (za.za_integer_length) { 435 case 8: 436 /* integer property */ 437 if (za.za_first_integer != 438 zpool_prop_default_numeric(prop)) 439 src = ZPROP_SRC_LOCAL; 440 441 if (prop == ZPOOL_PROP_BOOTFS) { 442 dsl_pool_t *dp; 443 dsl_dataset_t *ds = NULL; 444 445 dp = spa_get_dsl(spa); 446 dsl_pool_config_enter(dp, FTAG); 447 err = dsl_dataset_hold_obj(dp, 448 za.za_first_integer, FTAG, &ds); 449 if (err != 0) { 450 dsl_pool_config_exit(dp, FTAG); 451 break; 452 } 453 454 strval = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, 455 KM_SLEEP); 456 dsl_dataset_name(ds, strval); 457 dsl_dataset_rele(ds, FTAG); 458 dsl_pool_config_exit(dp, FTAG); 459 } else { 460 strval = NULL; 461 intval = za.za_first_integer; 462 } 463 464 spa_prop_add_list(*nvp, prop, strval, intval, src); 465 466 if (strval != NULL) 467 kmem_free(strval, ZFS_MAX_DATASET_NAME_LEN); 468 469 break; 470 471 case 1: 472 /* string property */ 473 strval = kmem_alloc(za.za_num_integers, KM_SLEEP); 474 err = zap_lookup(mos, spa->spa_pool_props_object, 475 za.za_name, 1, za.za_num_integers, strval); 476 if (err) { 477 kmem_free(strval, za.za_num_integers); 478 break; 479 } 480 spa_prop_add_list(*nvp, prop, strval, 0, src); 481 kmem_free(strval, za.za_num_integers); 482 break; 483 484 default: 485 break; 486 } 487 } 488 zap_cursor_fini(&zc); 489 mutex_exit(&spa->spa_props_lock); 490out: 491 if (err && err != ENOENT) { 492 nvlist_free(*nvp); 493 *nvp = NULL; 494 return (err); 495 } 496 497 return (0); 498} 499 500/* 501 * Validate the given pool properties nvlist and modify the list 502 * for the property values to be set. 503 */ 504static int 505spa_prop_validate(spa_t *spa, nvlist_t *props) 506{ 507 nvpair_t *elem; 508 int error = 0, reset_bootfs = 0; 509 uint64_t objnum = 0; 510 boolean_t has_feature = B_FALSE; 511 512 elem = NULL; 513 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { 514 uint64_t intval; 515 char *strval, *slash, *check, *fname; 516 const char *propname = nvpair_name(elem); 517 zpool_prop_t prop = zpool_name_to_prop(propname); 518 519 switch (prop) { 520 case ZPOOL_PROP_INVAL: 521 if (!zpool_prop_feature(propname)) { 522 error = SET_ERROR(EINVAL); 523 break; 524 } 525 526 /* 527 * Sanitize the input. 528 */ 529 if (nvpair_type(elem) != DATA_TYPE_UINT64) { 530 error = SET_ERROR(EINVAL); 531 break; 532 } 533 534 if (nvpair_value_uint64(elem, &intval) != 0) { 535 error = SET_ERROR(EINVAL); 536 break; 537 } 538 539 if (intval != 0) { 540 error = SET_ERROR(EINVAL); 541 break; 542 } 543 544 fname = strchr(propname, '@') + 1; 545 if (zfeature_lookup_name(fname, NULL) != 0) { 546 error = SET_ERROR(EINVAL); 547 break; 548 } 549 550 has_feature = B_TRUE; 551 break; 552 553 case ZPOOL_PROP_VERSION: 554 error = nvpair_value_uint64(elem, &intval); 555 if (!error && 556 (intval < spa_version(spa) || 557 intval > SPA_VERSION_BEFORE_FEATURES || 558 has_feature)) 559 error = SET_ERROR(EINVAL); 560 break; 561 562 case ZPOOL_PROP_DELEGATION: 563 case ZPOOL_PROP_AUTOREPLACE: 564 case ZPOOL_PROP_LISTSNAPS: 565 case ZPOOL_PROP_AUTOEXPAND: 566 error = nvpair_value_uint64(elem, &intval); 567 if (!error && intval > 1) 568 error = SET_ERROR(EINVAL); 569 break; 570 571 case ZPOOL_PROP_BOOTFS: 572 /* 573 * If the pool version is less than SPA_VERSION_BOOTFS, 574 * or the pool is still being created (version == 0), 575 * the bootfs property cannot be set. 576 */ 577 if (spa_version(spa) < SPA_VERSION_BOOTFS) { 578 error = SET_ERROR(ENOTSUP); 579 break; 580 } 581 582 /* 583 * Make sure the vdev config is bootable 584 */ 585 if (!vdev_is_bootable(spa->spa_root_vdev)) { 586 error = SET_ERROR(ENOTSUP); 587 break; 588 } 589 590 reset_bootfs = 1; 591 592 error = nvpair_value_string(elem, &strval); 593 594 if (!error) { 595 objset_t *os; 596 uint64_t propval; 597 598 if (strval == NULL || strval[0] == '\0') { 599 objnum = zpool_prop_default_numeric( 600 ZPOOL_PROP_BOOTFS); 601 break; 602 } 603 604 error = dmu_objset_hold(strval, FTAG, &os); 605 if (error != 0) 606 break; 607 608 /* 609 * Must be ZPL, and its property settings 610 * must be supported by GRUB (compression 611 * is not gzip, and large blocks are not used). 612 */ 613 614 if (dmu_objset_type(os) != DMU_OST_ZFS) { 615 error = SET_ERROR(ENOTSUP); 616 } else if ((error = 617 dsl_prop_get_int_ds(dmu_objset_ds(os), 618 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 619 &propval)) == 0 && 620 !BOOTFS_COMPRESS_VALID(propval)) { 621 error = SET_ERROR(ENOTSUP); 622 } else { 623 objnum = dmu_objset_id(os); 624 } 625 dmu_objset_rele(os, FTAG); 626 } 627 break; 628 629 case ZPOOL_PROP_FAILUREMODE: 630 error = nvpair_value_uint64(elem, &intval); 631 if (!error && (intval < ZIO_FAILURE_MODE_WAIT || 632 intval > ZIO_FAILURE_MODE_PANIC)) 633 error = SET_ERROR(EINVAL); 634 635 /* 636 * This is a special case which only occurs when 637 * the pool has completely failed. This allows 638 * the user to change the in-core failmode property 639 * without syncing it out to disk (I/Os might 640 * currently be blocked). We do this by returning 641 * EIO to the caller (spa_prop_set) to trick it 642 * into thinking we encountered a property validation 643 * error. 644 */ 645 if (!error && spa_suspended(spa)) { 646 spa->spa_failmode = intval; 647 error = SET_ERROR(EIO); 648 } 649 break; 650 651 case ZPOOL_PROP_CACHEFILE: 652 if ((error = nvpair_value_string(elem, &strval)) != 0) 653 break; 654 655 if (strval[0] == '\0') 656 break; 657 658 if (strcmp(strval, "none") == 0) 659 break; 660 661 if (strval[0] != '/') { 662 error = SET_ERROR(EINVAL); 663 break; 664 } 665 666 slash = strrchr(strval, '/'); 667 ASSERT(slash != NULL); 668 669 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || 670 strcmp(slash, "/..") == 0) 671 error = SET_ERROR(EINVAL); 672 break; 673 674 case ZPOOL_PROP_COMMENT: 675 if ((error = nvpair_value_string(elem, &strval)) != 0) 676 break; 677 for (check = strval; *check != '\0'; check++) { 678 /* 679 * The kernel doesn't have an easy isprint() 680 * check. For this kernel check, we merely 681 * check ASCII apart from DEL. Fix this if 682 * there is an easy-to-use kernel isprint(). 683 */ 684 if (*check >= 0x7f) { 685 error = SET_ERROR(EINVAL); 686 break; 687 } 688 } 689 if (strlen(strval) > ZPROP_MAX_COMMENT) 690 error = E2BIG; 691 break; 692 693 case ZPOOL_PROP_DEDUPDITTO: 694 if (spa_version(spa) < SPA_VERSION_DEDUP) 695 error = SET_ERROR(ENOTSUP); 696 else 697 error = nvpair_value_uint64(elem, &intval); 698 if (error == 0 && 699 intval != 0 && intval < ZIO_DEDUPDITTO_MIN) 700 error = SET_ERROR(EINVAL); 701 break; 702 } 703 704 if (error) 705 break; 706 } 707 708 if (!error && reset_bootfs) { 709 error = nvlist_remove(props, 710 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); 711 712 if (!error) { 713 error = nvlist_add_uint64(props, 714 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); 715 } 716 } 717 718 return (error); 719} 720 721void 722spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) 723{ 724 char *cachefile; 725 spa_config_dirent_t *dp; 726 727 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), 728 &cachefile) != 0) 729 return; 730 731 dp = kmem_alloc(sizeof (spa_config_dirent_t), 732 KM_SLEEP); 733 734 if (cachefile[0] == '\0') 735 dp->scd_path = spa_strdup(spa_config_path); 736 else if (strcmp(cachefile, "none") == 0) 737 dp->scd_path = NULL; 738 else 739 dp->scd_path = spa_strdup(cachefile); 740 741 list_insert_head(&spa->spa_config_list, dp); 742 if (need_sync) 743 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 744} 745 746int 747spa_prop_set(spa_t *spa, nvlist_t *nvp) 748{ 749 int error; 750 nvpair_t *elem = NULL; 751 boolean_t need_sync = B_FALSE; 752 753 if ((error = spa_prop_validate(spa, nvp)) != 0) 754 return (error); 755 756 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { 757 zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); 758 759 if (prop == ZPOOL_PROP_CACHEFILE || 760 prop == ZPOOL_PROP_ALTROOT || 761 prop == ZPOOL_PROP_READONLY) 762 continue; 763 764 if (prop == ZPOOL_PROP_VERSION || prop == ZPOOL_PROP_INVAL) { 765 uint64_t ver; 766 767 if (prop == ZPOOL_PROP_VERSION) { 768 VERIFY(nvpair_value_uint64(elem, &ver) == 0); 769 } else { 770 ASSERT(zpool_prop_feature(nvpair_name(elem))); 771 ver = SPA_VERSION_FEATURES; 772 need_sync = B_TRUE; 773 } 774 775 /* Save time if the version is already set. */ 776 if (ver == spa_version(spa)) 777 continue; 778 779 /* 780 * In addition to the pool directory object, we might 781 * create the pool properties object, the features for 782 * read object, the features for write object, or the 783 * feature descriptions object. 784 */ 785 error = dsl_sync_task(spa->spa_name, NULL, 786 spa_sync_version, &ver, 787 6, ZFS_SPACE_CHECK_RESERVED); 788 if (error) 789 return (error); 790 continue; 791 } 792 793 need_sync = B_TRUE; 794 break; 795 } 796 797 if (need_sync) { 798 return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, 799 nvp, 6, ZFS_SPACE_CHECK_RESERVED)); 800 } 801 802 return (0); 803} 804 805/* 806 * If the bootfs property value is dsobj, clear it. 807 */ 808void 809spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) 810{ 811 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { 812 VERIFY(zap_remove(spa->spa_meta_objset, 813 spa->spa_pool_props_object, 814 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); 815 spa->spa_bootfs = 0; 816 } 817} 818 819/*ARGSUSED*/ 820static int 821spa_change_guid_check(void *arg, dmu_tx_t *tx) 822{ 823 uint64_t *newguid = arg; 824 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 825 vdev_t *rvd = spa->spa_root_vdev; 826 uint64_t vdev_state; 827 828 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 829 int error = (spa_has_checkpoint(spa)) ? 830 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 831 return (SET_ERROR(error)); 832 } 833 834 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 835 vdev_state = rvd->vdev_state; 836 spa_config_exit(spa, SCL_STATE, FTAG); 837 838 if (vdev_state != VDEV_STATE_HEALTHY) 839 return (SET_ERROR(ENXIO)); 840 841 ASSERT3U(spa_guid(spa), !=, *newguid); 842 843 return (0); 844} 845 846static void 847spa_change_guid_sync(void *arg, dmu_tx_t *tx) 848{ 849 uint64_t *newguid = arg; 850 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 851 uint64_t oldguid; 852 vdev_t *rvd = spa->spa_root_vdev; 853 854 oldguid = spa_guid(spa); 855 856 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 857 rvd->vdev_guid = *newguid; 858 rvd->vdev_guid_sum += (*newguid - oldguid); 859 vdev_config_dirty(rvd); 860 spa_config_exit(spa, SCL_STATE, FTAG); 861 862 spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", 863 oldguid, *newguid); 864} 865 866/* 867 * Change the GUID for the pool. This is done so that we can later 868 * re-import a pool built from a clone of our own vdevs. We will modify 869 * the root vdev's guid, our own pool guid, and then mark all of our 870 * vdevs dirty. Note that we must make sure that all our vdevs are 871 * online when we do this, or else any vdevs that weren't present 872 * would be orphaned from our pool. We are also going to issue a 873 * sysevent to update any watchers. 874 */ 875int 876spa_change_guid(spa_t *spa) 877{ 878 int error; 879 uint64_t guid; 880 881 mutex_enter(&spa->spa_vdev_top_lock); 882 mutex_enter(&spa_namespace_lock); 883 guid = spa_generate_guid(NULL); 884 885 error = dsl_sync_task(spa->spa_name, spa_change_guid_check, 886 spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); 887 888 if (error == 0) { 889 spa_write_cachefile(spa, B_FALSE, B_TRUE); 890 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_REGUID); 891 } 892 893 mutex_exit(&spa_namespace_lock); 894 mutex_exit(&spa->spa_vdev_top_lock); 895 896 return (error); 897} 898 899/* 900 * ========================================================================== 901 * SPA state manipulation (open/create/destroy/import/export) 902 * ========================================================================== 903 */ 904 905static int 906spa_error_entry_compare(const void *a, const void *b) 907{ 908 spa_error_entry_t *sa = (spa_error_entry_t *)a; 909 spa_error_entry_t *sb = (spa_error_entry_t *)b; 910 int ret; 911 912 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark, 913 sizeof (zbookmark_phys_t)); 914 915 if (ret < 0) 916 return (-1); 917 else if (ret > 0) 918 return (1); 919 else 920 return (0); 921} 922 923/* 924 * Utility function which retrieves copies of the current logs and 925 * re-initializes them in the process. 926 */ 927void 928spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) 929{ 930 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); 931 932 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); 933 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); 934 935 avl_create(&spa->spa_errlist_scrub, 936 spa_error_entry_compare, sizeof (spa_error_entry_t), 937 offsetof(spa_error_entry_t, se_avl)); 938 avl_create(&spa->spa_errlist_last, 939 spa_error_entry_compare, sizeof (spa_error_entry_t), 940 offsetof(spa_error_entry_t, se_avl)); 941} 942 943static void 944spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 945{ 946 const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; 947 enum zti_modes mode = ztip->zti_mode; 948 uint_t value = ztip->zti_value; 949 uint_t count = ztip->zti_count; 950 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 951 char name[32]; 952 uint_t flags = 0; 953 boolean_t batch = B_FALSE; 954 955 if (mode == ZTI_MODE_NULL) { 956 tqs->stqs_count = 0; 957 tqs->stqs_taskq = NULL; 958 return; 959 } 960 961 ASSERT3U(count, >, 0); 962 963 tqs->stqs_count = count; 964 tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); 965 966 switch (mode) { 967 case ZTI_MODE_FIXED: 968 ASSERT3U(value, >=, 1); 969 value = MAX(value, 1); 970 break; 971 972 case ZTI_MODE_BATCH: 973 batch = B_TRUE; 974 flags |= TASKQ_THREADS_CPU_PCT; 975 value = zio_taskq_batch_pct; 976 break; 977 978 default: 979 panic("unrecognized mode for %s_%s taskq (%u:%u) in " 980 "spa_activate()", 981 zio_type_name[t], zio_taskq_types[q], mode, value); 982 break; 983 } 984 985 for (uint_t i = 0; i < count; i++) { 986 taskq_t *tq; 987 988 if (count > 1) { 989 (void) snprintf(name, sizeof (name), "%s_%s_%u", 990 zio_type_name[t], zio_taskq_types[q], i); 991 } else { 992 (void) snprintf(name, sizeof (name), "%s_%s", 993 zio_type_name[t], zio_taskq_types[q]); 994 } 995 996#ifdef SYSDC 997 if (zio_taskq_sysdc && spa->spa_proc != &p0) { 998 if (batch) 999 flags |= TASKQ_DC_BATCH; 1000 1001 tq = taskq_create_sysdc(name, value, 50, INT_MAX, 1002 spa->spa_proc, zio_taskq_basedc, flags); 1003 } else { 1004#endif 1005 pri_t pri = maxclsyspri; 1006 /* 1007 * The write issue taskq can be extremely CPU 1008 * intensive. Run it at slightly lower priority 1009 * than the other taskqs. 1010 * FreeBSD notes: 1011 * - numerically higher priorities are lower priorities; 1012 * - if priorities divided by four (RQ_PPQ) are equal 1013 * then a difference between them is insignificant. 1014 */ 1015 if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) 1016#ifdef illumos 1017 pri--; 1018#else 1019 pri += 4; 1020#endif 1021 1022 tq = taskq_create_proc(name, value, pri, 50, 1023 INT_MAX, spa->spa_proc, flags); 1024#ifdef SYSDC 1025 } 1026#endif 1027 1028 tqs->stqs_taskq[i] = tq; 1029 } 1030} 1031 1032static void 1033spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 1034{ 1035 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1036 1037 if (tqs->stqs_taskq == NULL) { 1038 ASSERT0(tqs->stqs_count); 1039 return; 1040 } 1041 1042 for (uint_t i = 0; i < tqs->stqs_count; i++) { 1043 ASSERT3P(tqs->stqs_taskq[i], !=, NULL); 1044 taskq_destroy(tqs->stqs_taskq[i]); 1045 } 1046 1047 kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); 1048 tqs->stqs_taskq = NULL; 1049} 1050 1051/* 1052 * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. 1053 * Note that a type may have multiple discrete taskqs to avoid lock contention 1054 * on the taskq itself. In that case we choose which taskq at random by using 1055 * the low bits of gethrtime(). 1056 */ 1057void 1058spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, 1059 task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) 1060{ 1061 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1062 taskq_t *tq; 1063 1064 ASSERT3P(tqs->stqs_taskq, !=, NULL); 1065 ASSERT3U(tqs->stqs_count, !=, 0); 1066 1067 if (tqs->stqs_count == 1) { 1068 tq = tqs->stqs_taskq[0]; 1069 } else { 1070#ifdef _KERNEL 1071 tq = tqs->stqs_taskq[cpu_ticks() % tqs->stqs_count]; 1072#else 1073 tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; 1074#endif 1075 } 1076 1077 taskq_dispatch_ent(tq, func, arg, flags, ent); 1078} 1079 1080static void 1081spa_create_zio_taskqs(spa_t *spa) 1082{ 1083 for (int t = 0; t < ZIO_TYPES; t++) { 1084 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1085 spa_taskqs_init(spa, t, q); 1086 } 1087 } 1088} 1089 1090#ifdef _KERNEL 1091#ifdef SPA_PROCESS 1092static void 1093spa_thread(void *arg) 1094{ 1095 callb_cpr_t cprinfo; 1096 1097 spa_t *spa = arg; 1098 user_t *pu = PTOU(curproc); 1099 1100 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, 1101 spa->spa_name); 1102 1103 ASSERT(curproc != &p0); 1104 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), 1105 "zpool-%s", spa->spa_name); 1106 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); 1107 1108#ifdef PSRSET_BIND 1109 /* bind this thread to the requested psrset */ 1110 if (zio_taskq_psrset_bind != PS_NONE) { 1111 pool_lock(); 1112 mutex_enter(&cpu_lock); 1113 mutex_enter(&pidlock); 1114 mutex_enter(&curproc->p_lock); 1115 1116 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, 1117 0, NULL, NULL) == 0) { 1118 curthread->t_bind_pset = zio_taskq_psrset_bind; 1119 } else { 1120 cmn_err(CE_WARN, 1121 "Couldn't bind process for zfs pool \"%s\" to " 1122 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); 1123 } 1124 1125 mutex_exit(&curproc->p_lock); 1126 mutex_exit(&pidlock); 1127 mutex_exit(&cpu_lock); 1128 pool_unlock(); 1129 } 1130#endif 1131 1132#ifdef SYSDC 1133 if (zio_taskq_sysdc) { 1134 sysdc_thread_enter(curthread, 100, 0); 1135 } 1136#endif 1137 1138 spa->spa_proc = curproc; 1139 spa->spa_did = curthread->t_did; 1140 1141 spa_create_zio_taskqs(spa); 1142 1143 mutex_enter(&spa->spa_proc_lock); 1144 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); 1145 1146 spa->spa_proc_state = SPA_PROC_ACTIVE; 1147 cv_broadcast(&spa->spa_proc_cv); 1148 1149 CALLB_CPR_SAFE_BEGIN(&cprinfo); 1150 while (spa->spa_proc_state == SPA_PROC_ACTIVE) 1151 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1152 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); 1153 1154 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); 1155 spa->spa_proc_state = SPA_PROC_GONE; 1156 spa->spa_proc = &p0; 1157 cv_broadcast(&spa->spa_proc_cv); 1158 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ 1159 1160 mutex_enter(&curproc->p_lock); 1161 lwp_exit(); 1162} 1163#endif /* SPA_PROCESS */ 1164#endif 1165 1166/* 1167 * Activate an uninitialized pool. 1168 */ 1169static void 1170spa_activate(spa_t *spa, int mode) 1171{ 1172 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 1173 1174 spa->spa_state = POOL_STATE_ACTIVE; 1175 spa->spa_mode = mode; 1176 1177 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); 1178 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); 1179 1180 /* Try to create a covering process */ 1181 mutex_enter(&spa->spa_proc_lock); 1182 ASSERT(spa->spa_proc_state == SPA_PROC_NONE); 1183 ASSERT(spa->spa_proc == &p0); 1184 spa->spa_did = 0; 1185 1186#ifdef SPA_PROCESS 1187 /* Only create a process if we're going to be around a while. */ 1188 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { 1189 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, 1190 NULL, 0) == 0) { 1191 spa->spa_proc_state = SPA_PROC_CREATED; 1192 while (spa->spa_proc_state == SPA_PROC_CREATED) { 1193 cv_wait(&spa->spa_proc_cv, 1194 &spa->spa_proc_lock); 1195 } 1196 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1197 ASSERT(spa->spa_proc != &p0); 1198 ASSERT(spa->spa_did != 0); 1199 } else { 1200#ifdef _KERNEL 1201 cmn_err(CE_WARN, 1202 "Couldn't create process for zfs pool \"%s\"\n", 1203 spa->spa_name); 1204#endif 1205 } 1206 } 1207#endif /* SPA_PROCESS */ 1208 mutex_exit(&spa->spa_proc_lock); 1209 1210 /* If we didn't create a process, we need to create our taskqs. */ 1211 ASSERT(spa->spa_proc == &p0); 1212 if (spa->spa_proc == &p0) { 1213 spa_create_zio_taskqs(spa); 1214 } 1215 1216 /* 1217 * Start TRIM thread. 1218 */ 1219 trim_thread_create(spa); 1220 1221 for (size_t i = 0; i < TXG_SIZE; i++) { 1222 spa->spa_txg_zio[i] = zio_root(spa, NULL, NULL, 1223 ZIO_FLAG_CANFAIL); 1224 } 1225 1226 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), 1227 offsetof(vdev_t, vdev_config_dirty_node)); 1228 list_create(&spa->spa_evicting_os_list, sizeof (objset_t), 1229 offsetof(objset_t, os_evicting_node)); 1230 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), 1231 offsetof(vdev_t, vdev_state_dirty_node)); 1232 1233 txg_list_create(&spa->spa_vdev_txg_list, spa, 1234 offsetof(struct vdev, vdev_txg_node)); 1235 1236 avl_create(&spa->spa_errlist_scrub, 1237 spa_error_entry_compare, sizeof (spa_error_entry_t), 1238 offsetof(spa_error_entry_t, se_avl)); 1239 avl_create(&spa->spa_errlist_last, 1240 spa_error_entry_compare, sizeof (spa_error_entry_t), 1241 offsetof(spa_error_entry_t, se_avl)); 1242} 1243 1244/* 1245 * Opposite of spa_activate(). 1246 */ 1247static void 1248spa_deactivate(spa_t *spa) 1249{ 1250 ASSERT(spa->spa_sync_on == B_FALSE); 1251 ASSERT(spa->spa_dsl_pool == NULL); 1252 ASSERT(spa->spa_root_vdev == NULL); 1253 ASSERT(spa->spa_async_zio_root == NULL); 1254 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); 1255 1256 /* 1257 * Stop TRIM thread in case spa_unload() wasn't called directly 1258 * before spa_deactivate(). 1259 */ 1260 trim_thread_destroy(spa); 1261 1262 spa_evicting_os_wait(spa); 1263 1264 txg_list_destroy(&spa->spa_vdev_txg_list); 1265 1266 list_destroy(&spa->spa_config_dirty_list); 1267 list_destroy(&spa->spa_evicting_os_list); 1268 list_destroy(&spa->spa_state_dirty_list); 1269 1270 for (int t = 0; t < ZIO_TYPES; t++) { 1271 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1272 spa_taskqs_fini(spa, t, q); 1273 } 1274 } 1275 1276 for (size_t i = 0; i < TXG_SIZE; i++) { 1277 ASSERT3P(spa->spa_txg_zio[i], !=, NULL); 1278 VERIFY0(zio_wait(spa->spa_txg_zio[i])); 1279 spa->spa_txg_zio[i] = NULL; 1280 } 1281 1282 metaslab_class_destroy(spa->spa_normal_class); 1283 spa->spa_normal_class = NULL; 1284 1285 metaslab_class_destroy(spa->spa_log_class); 1286 spa->spa_log_class = NULL; 1287 1288 /* 1289 * If this was part of an import or the open otherwise failed, we may 1290 * still have errors left in the queues. Empty them just in case. 1291 */ 1292 spa_errlog_drain(spa); 1293 1294 avl_destroy(&spa->spa_errlist_scrub); 1295 avl_destroy(&spa->spa_errlist_last); 1296 1297 spa->spa_state = POOL_STATE_UNINITIALIZED; 1298 1299 mutex_enter(&spa->spa_proc_lock); 1300 if (spa->spa_proc_state != SPA_PROC_NONE) { 1301 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1302 spa->spa_proc_state = SPA_PROC_DEACTIVATE; 1303 cv_broadcast(&spa->spa_proc_cv); 1304 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { 1305 ASSERT(spa->spa_proc != &p0); 1306 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1307 } 1308 ASSERT(spa->spa_proc_state == SPA_PROC_GONE); 1309 spa->spa_proc_state = SPA_PROC_NONE; 1310 } 1311 ASSERT(spa->spa_proc == &p0); 1312 mutex_exit(&spa->spa_proc_lock); 1313 1314#ifdef SPA_PROCESS 1315 /* 1316 * We want to make sure spa_thread() has actually exited the ZFS 1317 * module, so that the module can't be unloaded out from underneath 1318 * it. 1319 */ 1320 if (spa->spa_did != 0) { 1321 thread_join(spa->spa_did); 1322 spa->spa_did = 0; 1323 } 1324#endif /* SPA_PROCESS */ 1325} 1326 1327/* 1328 * Verify a pool configuration, and construct the vdev tree appropriately. This 1329 * will create all the necessary vdevs in the appropriate layout, with each vdev 1330 * in the CLOSED state. This will prep the pool before open/creation/import. 1331 * All vdev validation is done by the vdev_alloc() routine. 1332 */ 1333static int 1334spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, 1335 uint_t id, int atype) 1336{ 1337 nvlist_t **child; 1338 uint_t children; 1339 int error; 1340 1341 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) 1342 return (error); 1343 1344 if ((*vdp)->vdev_ops->vdev_op_leaf) 1345 return (0); 1346 1347 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1348 &child, &children); 1349 1350 if (error == ENOENT) 1351 return (0); 1352 1353 if (error) { 1354 vdev_free(*vdp); 1355 *vdp = NULL; 1356 return (SET_ERROR(EINVAL)); 1357 } 1358 1359 for (int c = 0; c < children; c++) { 1360 vdev_t *vd; 1361 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, 1362 atype)) != 0) { 1363 vdev_free(*vdp); 1364 *vdp = NULL; 1365 return (error); 1366 } 1367 } 1368 1369 ASSERT(*vdp != NULL); 1370 1371 return (0); 1372} 1373 1374/* 1375 * Opposite of spa_load(). 1376 */ 1377static void 1378spa_unload(spa_t *spa) 1379{ 1380 int i; 1381 1382 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1383 1384 spa_load_note(spa, "UNLOADING"); 1385 1386 /* 1387 * Stop TRIM thread. 1388 */ 1389 trim_thread_destroy(spa); 1390 1391 /* 1392 * Stop async tasks. 1393 */ 1394 spa_async_suspend(spa); 1395 1396 if (spa->spa_root_vdev) { 1397 vdev_initialize_stop_all(spa->spa_root_vdev, 1398 VDEV_INITIALIZE_ACTIVE); 1399 } 1400 1401 /* 1402 * Stop syncing. 1403 */ 1404 if (spa->spa_sync_on) { 1405 txg_sync_stop(spa->spa_dsl_pool); 1406 spa->spa_sync_on = B_FALSE; 1407 } 1408 1409 /* 1410 * Even though vdev_free() also calls vdev_metaslab_fini, we need 1411 * to call it earlier, before we wait for async i/o to complete. 1412 * This ensures that there is no async metaslab prefetching, by 1413 * calling taskq_wait(mg_taskq). 1414 */ 1415 if (spa->spa_root_vdev != NULL) { 1416 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1417 for (int c = 0; c < spa->spa_root_vdev->vdev_children; c++) 1418 vdev_metaslab_fini(spa->spa_root_vdev->vdev_child[c]); 1419 spa_config_exit(spa, SCL_ALL, spa); 1420 } 1421 1422 /* 1423 * Wait for any outstanding async I/O to complete. 1424 */ 1425 if (spa->spa_async_zio_root != NULL) { 1426 for (int i = 0; i < max_ncpus; i++) 1427 (void) zio_wait(spa->spa_async_zio_root[i]); 1428 kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); 1429 spa->spa_async_zio_root = NULL; 1430 } 1431 1432 if (spa->spa_vdev_removal != NULL) { 1433 spa_vdev_removal_destroy(spa->spa_vdev_removal); 1434 spa->spa_vdev_removal = NULL; 1435 } 1436 1437 if (spa->spa_condense_zthr != NULL) { 1438 ASSERT(!zthr_isrunning(spa->spa_condense_zthr)); 1439 zthr_destroy(spa->spa_condense_zthr); 1440 spa->spa_condense_zthr = NULL; 1441 } 1442 1443 if (spa->spa_checkpoint_discard_zthr != NULL) { 1444 ASSERT(!zthr_isrunning(spa->spa_checkpoint_discard_zthr)); 1445 zthr_destroy(spa->spa_checkpoint_discard_zthr); 1446 spa->spa_checkpoint_discard_zthr = NULL; 1447 } 1448 1449 spa_condense_fini(spa); 1450 1451 bpobj_close(&spa->spa_deferred_bpobj); 1452 1453 spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); 1454 1455 /* 1456 * Close all vdevs. 1457 */ 1458 if (spa->spa_root_vdev) 1459 vdev_free(spa->spa_root_vdev); 1460 ASSERT(spa->spa_root_vdev == NULL); 1461 1462 /* 1463 * Close the dsl pool. 1464 */ 1465 if (spa->spa_dsl_pool) { 1466 dsl_pool_close(spa->spa_dsl_pool); 1467 spa->spa_dsl_pool = NULL; 1468 spa->spa_meta_objset = NULL; 1469 } 1470 1471 ddt_unload(spa); 1472 1473 /* 1474 * Drop and purge level 2 cache 1475 */ 1476 spa_l2cache_drop(spa); 1477 1478 for (i = 0; i < spa->spa_spares.sav_count; i++) 1479 vdev_free(spa->spa_spares.sav_vdevs[i]); 1480 if (spa->spa_spares.sav_vdevs) { 1481 kmem_free(spa->spa_spares.sav_vdevs, 1482 spa->spa_spares.sav_count * sizeof (void *)); 1483 spa->spa_spares.sav_vdevs = NULL; 1484 } 1485 if (spa->spa_spares.sav_config) { 1486 nvlist_free(spa->spa_spares.sav_config); 1487 spa->spa_spares.sav_config = NULL; 1488 } 1489 spa->spa_spares.sav_count = 0; 1490 1491 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 1492 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); 1493 vdev_free(spa->spa_l2cache.sav_vdevs[i]); 1494 } 1495 if (spa->spa_l2cache.sav_vdevs) { 1496 kmem_free(spa->spa_l2cache.sav_vdevs, 1497 spa->spa_l2cache.sav_count * sizeof (void *)); 1498 spa->spa_l2cache.sav_vdevs = NULL; 1499 } 1500 if (spa->spa_l2cache.sav_config) { 1501 nvlist_free(spa->spa_l2cache.sav_config); 1502 spa->spa_l2cache.sav_config = NULL; 1503 } 1504 spa->spa_l2cache.sav_count = 0; 1505 1506 spa->spa_async_suspended = 0; 1507 1508 spa->spa_indirect_vdevs_loaded = B_FALSE; 1509 1510 if (spa->spa_comment != NULL) { 1511 spa_strfree(spa->spa_comment); 1512 spa->spa_comment = NULL; 1513 } 1514 1515 spa_config_exit(spa, SCL_ALL, spa); 1516} 1517 1518/* 1519 * Load (or re-load) the current list of vdevs describing the active spares for 1520 * this pool. When this is called, we have some form of basic information in 1521 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and 1522 * then re-generate a more complete list including status information. 1523 */ 1524void 1525spa_load_spares(spa_t *spa) 1526{ 1527 nvlist_t **spares; 1528 uint_t nspares; 1529 int i; 1530 vdev_t *vd, *tvd; 1531 1532#ifndef _KERNEL 1533 /* 1534 * zdb opens both the current state of the pool and the 1535 * checkpointed state (if present), with a different spa_t. 1536 * 1537 * As spare vdevs are shared among open pools, we skip loading 1538 * them when we load the checkpointed state of the pool. 1539 */ 1540 if (!spa_writeable(spa)) 1541 return; 1542#endif 1543 1544 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1545 1546 /* 1547 * First, close and free any existing spare vdevs. 1548 */ 1549 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1550 vd = spa->spa_spares.sav_vdevs[i]; 1551 1552 /* Undo the call to spa_activate() below */ 1553 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1554 B_FALSE)) != NULL && tvd->vdev_isspare) 1555 spa_spare_remove(tvd); 1556 vdev_close(vd); 1557 vdev_free(vd); 1558 } 1559 1560 if (spa->spa_spares.sav_vdevs) 1561 kmem_free(spa->spa_spares.sav_vdevs, 1562 spa->spa_spares.sav_count * sizeof (void *)); 1563 1564 if (spa->spa_spares.sav_config == NULL) 1565 nspares = 0; 1566 else 1567 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 1568 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 1569 1570 spa->spa_spares.sav_count = (int)nspares; 1571 spa->spa_spares.sav_vdevs = NULL; 1572 1573 if (nspares == 0) 1574 return; 1575 1576 /* 1577 * Construct the array of vdevs, opening them to get status in the 1578 * process. For each spare, there is potentially two different vdev_t 1579 * structures associated with it: one in the list of spares (used only 1580 * for basic validation purposes) and one in the active vdev 1581 * configuration (if it's spared in). During this phase we open and 1582 * validate each vdev on the spare list. If the vdev also exists in the 1583 * active configuration, then we also mark this vdev as an active spare. 1584 */ 1585 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *), 1586 KM_SLEEP); 1587 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1588 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, 1589 VDEV_ALLOC_SPARE) == 0); 1590 ASSERT(vd != NULL); 1591 1592 spa->spa_spares.sav_vdevs[i] = vd; 1593 1594 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1595 B_FALSE)) != NULL) { 1596 if (!tvd->vdev_isspare) 1597 spa_spare_add(tvd); 1598 1599 /* 1600 * We only mark the spare active if we were successfully 1601 * able to load the vdev. Otherwise, importing a pool 1602 * with a bad active spare would result in strange 1603 * behavior, because multiple pool would think the spare 1604 * is actively in use. 1605 * 1606 * There is a vulnerability here to an equally bizarre 1607 * circumstance, where a dead active spare is later 1608 * brought back to life (onlined or otherwise). Given 1609 * the rarity of this scenario, and the extra complexity 1610 * it adds, we ignore the possibility. 1611 */ 1612 if (!vdev_is_dead(tvd)) 1613 spa_spare_activate(tvd); 1614 } 1615 1616 vd->vdev_top = vd; 1617 vd->vdev_aux = &spa->spa_spares; 1618 1619 if (vdev_open(vd) != 0) 1620 continue; 1621 1622 if (vdev_validate_aux(vd) == 0) 1623 spa_spare_add(vd); 1624 } 1625 1626 /* 1627 * Recompute the stashed list of spares, with status information 1628 * this time. 1629 */ 1630 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, 1631 DATA_TYPE_NVLIST_ARRAY) == 0); 1632 1633 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), 1634 KM_SLEEP); 1635 for (i = 0; i < spa->spa_spares.sav_count; i++) 1636 spares[i] = vdev_config_generate(spa, 1637 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); 1638 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 1639 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); 1640 for (i = 0; i < spa->spa_spares.sav_count; i++) 1641 nvlist_free(spares[i]); 1642 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); 1643} 1644 1645/* 1646 * Load (or re-load) the current list of vdevs describing the active l2cache for 1647 * this pool. When this is called, we have some form of basic information in 1648 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and 1649 * then re-generate a more complete list including status information. 1650 * Devices which are already active have their details maintained, and are 1651 * not re-opened. 1652 */ 1653void 1654spa_load_l2cache(spa_t *spa) 1655{ 1656 nvlist_t **l2cache; 1657 uint_t nl2cache; 1658 int i, j, oldnvdevs; 1659 uint64_t guid; 1660 vdev_t *vd, **oldvdevs, **newvdevs; 1661 spa_aux_vdev_t *sav = &spa->spa_l2cache; 1662 1663#ifndef _KERNEL 1664 /* 1665 * zdb opens both the current state of the pool and the 1666 * checkpointed state (if present), with a different spa_t. 1667 * 1668 * As L2 caches are part of the ARC which is shared among open 1669 * pools, we skip loading them when we load the checkpointed 1670 * state of the pool. 1671 */ 1672 if (!spa_writeable(spa)) 1673 return; 1674#endif 1675 1676 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1677 1678 if (sav->sav_config != NULL) { 1679 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 1680 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 1681 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); 1682 } else { 1683 nl2cache = 0; 1684 newvdevs = NULL; 1685 } 1686 1687 oldvdevs = sav->sav_vdevs; 1688 oldnvdevs = sav->sav_count; 1689 sav->sav_vdevs = NULL; 1690 sav->sav_count = 0; 1691 1692 /* 1693 * Process new nvlist of vdevs. 1694 */ 1695 for (i = 0; i < nl2cache; i++) { 1696 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, 1697 &guid) == 0); 1698 1699 newvdevs[i] = NULL; 1700 for (j = 0; j < oldnvdevs; j++) { 1701 vd = oldvdevs[j]; 1702 if (vd != NULL && guid == vd->vdev_guid) { 1703 /* 1704 * Retain previous vdev for add/remove ops. 1705 */ 1706 newvdevs[i] = vd; 1707 oldvdevs[j] = NULL; 1708 break; 1709 } 1710 } 1711 1712 if (newvdevs[i] == NULL) { 1713 /* 1714 * Create new vdev 1715 */ 1716 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, 1717 VDEV_ALLOC_L2CACHE) == 0); 1718 ASSERT(vd != NULL); 1719 newvdevs[i] = vd; 1720 1721 /* 1722 * Commit this vdev as an l2cache device, 1723 * even if it fails to open. 1724 */ 1725 spa_l2cache_add(vd); 1726 1727 vd->vdev_top = vd; 1728 vd->vdev_aux = sav; 1729 1730 spa_l2cache_activate(vd); 1731 1732 if (vdev_open(vd) != 0) 1733 continue; 1734 1735 (void) vdev_validate_aux(vd); 1736 1737 if (!vdev_is_dead(vd)) 1738 l2arc_add_vdev(spa, vd); 1739 } 1740 } 1741 1742 /* 1743 * Purge vdevs that were dropped 1744 */ 1745 for (i = 0; i < oldnvdevs; i++) { 1746 uint64_t pool; 1747 1748 vd = oldvdevs[i]; 1749 if (vd != NULL) { 1750 ASSERT(vd->vdev_isl2cache); 1751 1752 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 1753 pool != 0ULL && l2arc_vdev_present(vd)) 1754 l2arc_remove_vdev(vd); 1755 vdev_clear_stats(vd); 1756 vdev_free(vd); 1757 } 1758 } 1759 1760 if (oldvdevs) 1761 kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); 1762 1763 if (sav->sav_config == NULL) 1764 goto out; 1765 1766 sav->sav_vdevs = newvdevs; 1767 sav->sav_count = (int)nl2cache; 1768 1769 /* 1770 * Recompute the stashed list of l2cache devices, with status 1771 * information this time. 1772 */ 1773 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, 1774 DATA_TYPE_NVLIST_ARRAY) == 0); 1775 1776 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 1777 for (i = 0; i < sav->sav_count; i++) 1778 l2cache[i] = vdev_config_generate(spa, 1779 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); 1780 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 1781 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); 1782out: 1783 for (i = 0; i < sav->sav_count; i++) 1784 nvlist_free(l2cache[i]); 1785 if (sav->sav_count) 1786 kmem_free(l2cache, sav->sav_count * sizeof (void *)); 1787} 1788 1789static int 1790load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) 1791{ 1792 dmu_buf_t *db; 1793 char *packed = NULL; 1794 size_t nvsize = 0; 1795 int error; 1796 *value = NULL; 1797 1798 error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); 1799 if (error != 0) 1800 return (error); 1801 1802 nvsize = *(uint64_t *)db->db_data; 1803 dmu_buf_rele(db, FTAG); 1804 1805 packed = kmem_alloc(nvsize, KM_SLEEP); 1806 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, 1807 DMU_READ_PREFETCH); 1808 if (error == 0) 1809 error = nvlist_unpack(packed, nvsize, value, 0); 1810 kmem_free(packed, nvsize); 1811 1812 return (error); 1813} 1814 1815/* 1816 * Concrete top-level vdevs that are not missing and are not logs. At every 1817 * spa_sync we write new uberblocks to at least SPA_SYNC_MIN_VDEVS core tvds. 1818 */ 1819static uint64_t 1820spa_healthy_core_tvds(spa_t *spa) 1821{ 1822 vdev_t *rvd = spa->spa_root_vdev; 1823 uint64_t tvds = 0; 1824 1825 for (uint64_t i = 0; i < rvd->vdev_children; i++) { 1826 vdev_t *vd = rvd->vdev_child[i]; 1827 if (vd->vdev_islog) 1828 continue; 1829 if (vdev_is_concrete(vd) && !vdev_is_dead(vd)) 1830 tvds++; 1831 } 1832 1833 return (tvds); 1834} 1835 1836/* 1837 * Checks to see if the given vdev could not be opened, in which case we post a 1838 * sysevent to notify the autoreplace code that the device has been removed. 1839 */ 1840static void 1841spa_check_removed(vdev_t *vd) 1842{ 1843 for (uint64_t c = 0; c < vd->vdev_children; c++) 1844 spa_check_removed(vd->vdev_child[c]); 1845 1846 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && 1847 vdev_is_concrete(vd)) { 1848 zfs_post_autoreplace(vd->vdev_spa, vd); 1849 spa_event_notify(vd->vdev_spa, vd, NULL, ESC_ZFS_VDEV_CHECK); 1850 } 1851} 1852 1853static int 1854spa_check_for_missing_logs(spa_t *spa) 1855{ 1856 vdev_t *rvd = spa->spa_root_vdev; 1857 1858 /* 1859 * If we're doing a normal import, then build up any additional 1860 * diagnostic information about missing log devices. 1861 * We'll pass this up to the user for further processing. 1862 */ 1863 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { 1864 nvlist_t **child, *nv; 1865 uint64_t idx = 0; 1866 1867 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **), 1868 KM_SLEEP); 1869 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1870 1871 for (uint64_t c = 0; c < rvd->vdev_children; c++) { 1872 vdev_t *tvd = rvd->vdev_child[c]; 1873 1874 /* 1875 * We consider a device as missing only if it failed 1876 * to open (i.e. offline or faulted is not considered 1877 * as missing). 1878 */ 1879 if (tvd->vdev_islog && 1880 tvd->vdev_state == VDEV_STATE_CANT_OPEN) { 1881 child[idx++] = vdev_config_generate(spa, tvd, 1882 B_FALSE, VDEV_CONFIG_MISSING); 1883 } 1884 } 1885 1886 if (idx > 0) { 1887 fnvlist_add_nvlist_array(nv, 1888 ZPOOL_CONFIG_CHILDREN, child, idx); 1889 fnvlist_add_nvlist(spa->spa_load_info, 1890 ZPOOL_CONFIG_MISSING_DEVICES, nv); 1891 1892 for (uint64_t i = 0; i < idx; i++) 1893 nvlist_free(child[i]); 1894 } 1895 nvlist_free(nv); 1896 kmem_free(child, rvd->vdev_children * sizeof (char **)); 1897 1898 if (idx > 0) { 1899 spa_load_failed(spa, "some log devices are missing"); 1900 vdev_dbgmsg_print_tree(rvd, 2); 1901 return (SET_ERROR(ENXIO)); 1902 } 1903 } else { 1904 for (uint64_t c = 0; c < rvd->vdev_children; c++) { 1905 vdev_t *tvd = rvd->vdev_child[c]; 1906 1907 if (tvd->vdev_islog && 1908 tvd->vdev_state == VDEV_STATE_CANT_OPEN) { 1909 spa_set_log_state(spa, SPA_LOG_CLEAR); 1910 spa_load_note(spa, "some log devices are " 1911 "missing, ZIL is dropped."); 1912 vdev_dbgmsg_print_tree(rvd, 2); 1913 break; 1914 } 1915 } 1916 } 1917 1918 return (0); 1919} 1920 1921/* 1922 * Check for missing log devices 1923 */ 1924static boolean_t 1925spa_check_logs(spa_t *spa) 1926{ 1927 boolean_t rv = B_FALSE; 1928 dsl_pool_t *dp = spa_get_dsl(spa); 1929 1930 switch (spa->spa_log_state) { 1931 case SPA_LOG_MISSING: 1932 /* need to recheck in case slog has been restored */ 1933 case SPA_LOG_UNKNOWN: 1934 rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 1935 zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0); 1936 if (rv) 1937 spa_set_log_state(spa, SPA_LOG_MISSING); 1938 break; 1939 } 1940 return (rv); 1941} 1942 1943static boolean_t 1944spa_passivate_log(spa_t *spa) 1945{ 1946 vdev_t *rvd = spa->spa_root_vdev; 1947 boolean_t slog_found = B_FALSE; 1948 1949 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1950 1951 if (!spa_has_slogs(spa)) 1952 return (B_FALSE); 1953 1954 for (int c = 0; c < rvd->vdev_children; c++) { 1955 vdev_t *tvd = rvd->vdev_child[c]; 1956 metaslab_group_t *mg = tvd->vdev_mg; 1957 1958 if (tvd->vdev_islog) { 1959 metaslab_group_passivate(mg); 1960 slog_found = B_TRUE; 1961 } 1962 } 1963 1964 return (slog_found); 1965} 1966 1967static void 1968spa_activate_log(spa_t *spa) 1969{ 1970 vdev_t *rvd = spa->spa_root_vdev; 1971 1972 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1973 1974 for (int c = 0; c < rvd->vdev_children; c++) { 1975 vdev_t *tvd = rvd->vdev_child[c]; 1976 metaslab_group_t *mg = tvd->vdev_mg; 1977 1978 if (tvd->vdev_islog) 1979 metaslab_group_activate(mg); 1980 } 1981} 1982 1983int 1984spa_reset_logs(spa_t *spa) 1985{ 1986 int error; 1987 1988 error = dmu_objset_find(spa_name(spa), zil_reset, 1989 NULL, DS_FIND_CHILDREN); 1990 if (error == 0) { 1991 /* 1992 * We successfully offlined the log device, sync out the 1993 * current txg so that the "stubby" block can be removed 1994 * by zil_sync(). 1995 */ 1996 txg_wait_synced(spa->spa_dsl_pool, 0); 1997 } 1998 return (error); 1999} 2000 2001static void 2002spa_aux_check_removed(spa_aux_vdev_t *sav) 2003{ 2004 int i; 2005 2006 for (i = 0; i < sav->sav_count; i++) 2007 spa_check_removed(sav->sav_vdevs[i]); 2008} 2009 2010void 2011spa_claim_notify(zio_t *zio) 2012{ 2013 spa_t *spa = zio->io_spa; 2014 2015 if (zio->io_error) 2016 return; 2017 2018 mutex_enter(&spa->spa_props_lock); /* any mutex will do */ 2019 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) 2020 spa->spa_claim_max_txg = zio->io_bp->blk_birth; 2021 mutex_exit(&spa->spa_props_lock); 2022} 2023 2024typedef struct spa_load_error { 2025 uint64_t sle_meta_count; 2026 uint64_t sle_data_count; 2027} spa_load_error_t; 2028 2029static void 2030spa_load_verify_done(zio_t *zio) 2031{ 2032 blkptr_t *bp = zio->io_bp; 2033 spa_load_error_t *sle = zio->io_private; 2034 dmu_object_type_t type = BP_GET_TYPE(bp); 2035 int error = zio->io_error; 2036 spa_t *spa = zio->io_spa; 2037 2038 abd_free(zio->io_abd); 2039 if (error) { 2040 if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && 2041 type != DMU_OT_INTENT_LOG) 2042 atomic_inc_64(&sle->sle_meta_count); 2043 else 2044 atomic_inc_64(&sle->sle_data_count); 2045 } 2046 2047 mutex_enter(&spa->spa_scrub_lock); 2048 spa->spa_load_verify_ios--; 2049 cv_broadcast(&spa->spa_scrub_io_cv); 2050 mutex_exit(&spa->spa_scrub_lock); 2051} 2052 2053/* 2054 * Maximum number of concurrent scrub i/os to create while verifying 2055 * a pool while importing it. 2056 */ 2057int spa_load_verify_maxinflight = 10000; 2058boolean_t spa_load_verify_metadata = B_TRUE; 2059boolean_t spa_load_verify_data = B_TRUE; 2060 2061SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_maxinflight, CTLFLAG_RWTUN, 2062 &spa_load_verify_maxinflight, 0, 2063 "Maximum number of concurrent scrub I/Os to create while verifying a " 2064 "pool while importing it"); 2065 2066SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_metadata, CTLFLAG_RWTUN, 2067 &spa_load_verify_metadata, 0, 2068 "Check metadata on import?"); 2069 2070SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_data, CTLFLAG_RWTUN, 2071 &spa_load_verify_data, 0, 2072 "Check user data on import?"); 2073 2074/*ARGSUSED*/ 2075static int 2076spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 2077 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 2078{ 2079 if (bp == NULL || BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 2080 return (0); 2081 /* 2082 * Note: normally this routine will not be called if 2083 * spa_load_verify_metadata is not set. However, it may be useful 2084 * to manually set the flag after the traversal has begun. 2085 */ 2086 if (!spa_load_verify_metadata) 2087 return (0); 2088 if (!BP_IS_METADATA(bp) && !spa_load_verify_data) 2089 return (0); 2090 2091 zio_t *rio = arg; 2092 size_t size = BP_GET_PSIZE(bp); 2093 2094 mutex_enter(&spa->spa_scrub_lock); 2095 while (spa->spa_load_verify_ios >= spa_load_verify_maxinflight) 2096 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 2097 spa->spa_load_verify_ios++; 2098 mutex_exit(&spa->spa_scrub_lock); 2099 2100 zio_nowait(zio_read(rio, spa, bp, abd_alloc_for_io(size, B_FALSE), size, 2101 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, 2102 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | 2103 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); 2104 return (0); 2105} 2106 2107/* ARGSUSED */ 2108int 2109verify_dataset_name_len(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) 2110{ 2111 if (dsl_dataset_namelen(ds) >= ZFS_MAX_DATASET_NAME_LEN) 2112 return (SET_ERROR(ENAMETOOLONG)); 2113 2114 return (0); 2115} 2116 2117static int 2118spa_load_verify(spa_t *spa) 2119{ 2120 zio_t *rio; 2121 spa_load_error_t sle = { 0 }; 2122 zpool_load_policy_t policy; 2123 boolean_t verify_ok = B_FALSE; 2124 int error = 0; 2125 2126 zpool_get_load_policy(spa->spa_config, &policy); 2127 2128 if (policy.zlp_rewind & ZPOOL_NEVER_REWIND) 2129 return (0); 2130 2131 dsl_pool_config_enter(spa->spa_dsl_pool, FTAG); 2132 error = dmu_objset_find_dp(spa->spa_dsl_pool, 2133 spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL, 2134 DS_FIND_CHILDREN); 2135 dsl_pool_config_exit(spa->spa_dsl_pool, FTAG); 2136 if (error != 0) 2137 return (error); 2138 2139 rio = zio_root(spa, NULL, &sle, 2140 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 2141 2142 if (spa_load_verify_metadata) { 2143 if (spa->spa_extreme_rewind) { 2144 spa_load_note(spa, "performing a complete scan of the " 2145 "pool since extreme rewind is on. This may take " 2146 "a very long time.\n (spa_load_verify_data=%u, " 2147 "spa_load_verify_metadata=%u)", 2148 spa_load_verify_data, spa_load_verify_metadata); 2149 } 2150 error = traverse_pool(spa, spa->spa_verify_min_txg, 2151 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 2152 spa_load_verify_cb, rio); 2153 } 2154 2155 (void) zio_wait(rio); 2156 2157 spa->spa_load_meta_errors = sle.sle_meta_count; 2158 spa->spa_load_data_errors = sle.sle_data_count; 2159 2160 if (sle.sle_meta_count != 0 || sle.sle_data_count != 0) { 2161 spa_load_note(spa, "spa_load_verify found %llu metadata errors " 2162 "and %llu data errors", (u_longlong_t)sle.sle_meta_count, 2163 (u_longlong_t)sle.sle_data_count); 2164 } 2165 2166 if (spa_load_verify_dryrun || 2167 (!error && sle.sle_meta_count <= policy.zlp_maxmeta && 2168 sle.sle_data_count <= policy.zlp_maxdata)) { 2169 int64_t loss = 0; 2170 2171 verify_ok = B_TRUE; 2172 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 2173 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 2174 2175 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 2176 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2177 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 2178 VERIFY(nvlist_add_int64(spa->spa_load_info, 2179 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 2180 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2181 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 2182 } else { 2183 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 2184 } 2185 2186 if (spa_load_verify_dryrun) 2187 return (0); 2188 2189 if (error) { 2190 if (error != ENXIO && error != EIO) 2191 error = SET_ERROR(EIO); 2192 return (error); 2193 } 2194 2195 return (verify_ok ? 0 : EIO); 2196} 2197 2198/* 2199 * Find a value in the pool props object. 2200 */ 2201static void 2202spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2203{ 2204 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2205 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2206} 2207 2208/* 2209 * Find a value in the pool directory object. 2210 */ 2211static int 2212spa_dir_prop(spa_t *spa, const char *name, uint64_t *val, boolean_t log_enoent) 2213{ 2214 int error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2215 name, sizeof (uint64_t), 1, val); 2216 2217 if (error != 0 && (error != ENOENT || log_enoent)) { 2218 spa_load_failed(spa, "couldn't get '%s' value in MOS directory " 2219 "[error=%d]", name, error); 2220 } 2221 2222 return (error); 2223} 2224 2225static int 2226spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2227{ 2228 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2229 return (SET_ERROR(err)); 2230} 2231 2232static void 2233spa_spawn_aux_threads(spa_t *spa) 2234{ 2235 ASSERT(spa_writeable(spa)); 2236 2237 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2238 2239 spa_start_indirect_condensing_thread(spa); 2240 2241 ASSERT3P(spa->spa_checkpoint_discard_zthr, ==, NULL); 2242 spa->spa_checkpoint_discard_zthr = 2243 zthr_create(spa_checkpoint_discard_thread_check, 2244 spa_checkpoint_discard_thread, spa); 2245} 2246 2247/* 2248 * Fix up config after a partly-completed split. This is done with the 2249 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2250 * pool have that entry in their config, but only the splitting one contains 2251 * a list of all the guids of the vdevs that are being split off. 2252 * 2253 * This function determines what to do with that list: either rejoin 2254 * all the disks to the pool, or complete the splitting process. To attempt 2255 * the rejoin, each disk that is offlined is marked online again, and 2256 * we do a reopen() call. If the vdev label for every disk that was 2257 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2258 * then we call vdev_split() on each disk, and complete the split. 2259 * 2260 * Otherwise we leave the config alone, with all the vdevs in place in 2261 * the original pool. 2262 */ 2263static void 2264spa_try_repair(spa_t *spa, nvlist_t *config) 2265{ 2266 uint_t extracted; 2267 uint64_t *glist; 2268 uint_t i, gcount; 2269 nvlist_t *nvl; 2270 vdev_t **vd; 2271 boolean_t attempt_reopen; 2272 2273 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2274 return; 2275 2276 /* check that the config is complete */ 2277 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2278 &glist, &gcount) != 0) 2279 return; 2280 2281 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2282 2283 /* attempt to online all the vdevs & validate */ 2284 attempt_reopen = B_TRUE; 2285 for (i = 0; i < gcount; i++) { 2286 if (glist[i] == 0) /* vdev is hole */ 2287 continue; 2288 2289 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2290 if (vd[i] == NULL) { 2291 /* 2292 * Don't bother attempting to reopen the disks; 2293 * just do the split. 2294 */ 2295 attempt_reopen = B_FALSE; 2296 } else { 2297 /* attempt to re-online it */ 2298 vd[i]->vdev_offline = B_FALSE; 2299 } 2300 } 2301 2302 if (attempt_reopen) { 2303 vdev_reopen(spa->spa_root_vdev); 2304 2305 /* check each device to see what state it's in */ 2306 for (extracted = 0, i = 0; i < gcount; i++) { 2307 if (vd[i] != NULL && 2308 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2309 break; 2310 ++extracted; 2311 } 2312 } 2313 2314 /* 2315 * If every disk has been moved to the new pool, or if we never 2316 * even attempted to look at them, then we split them off for 2317 * good. 2318 */ 2319 if (!attempt_reopen || gcount == extracted) { 2320 for (i = 0; i < gcount; i++) 2321 if (vd[i] != NULL) 2322 vdev_split(vd[i]); 2323 vdev_reopen(spa->spa_root_vdev); 2324 } 2325 2326 kmem_free(vd, gcount * sizeof (vdev_t *)); 2327} 2328 2329static int 2330spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type) 2331{ 2332 char *ereport = FM_EREPORT_ZFS_POOL; 2333 int error; 2334 2335 spa->spa_load_state = state; 2336 2337 gethrestime(&spa->spa_loaded_ts); 2338 error = spa_load_impl(spa, type, &ereport); 2339 2340 /* 2341 * Don't count references from objsets that are already closed 2342 * and are making their way through the eviction process. 2343 */ 2344 spa_evicting_os_wait(spa); 2345 spa->spa_minref = refcount_count(&spa->spa_refcount); 2346 if (error) { 2347 if (error != EEXIST) { 2348 spa->spa_loaded_ts.tv_sec = 0; 2349 spa->spa_loaded_ts.tv_nsec = 0; 2350 } 2351 if (error != EBADF) { 2352 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2353 } 2354 } 2355 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2356 spa->spa_ena = 0; 2357 2358 return (error); 2359} 2360 2361/* 2362 * Count the number of per-vdev ZAPs associated with all of the vdevs in the 2363 * vdev tree rooted in the given vd, and ensure that each ZAP is present in the 2364 * spa's per-vdev ZAP list. 2365 */ 2366static uint64_t 2367vdev_count_verify_zaps(vdev_t *vd) 2368{ 2369 spa_t *spa = vd->vdev_spa; 2370 uint64_t total = 0; 2371 if (vd->vdev_top_zap != 0) { 2372 total++; 2373 ASSERT0(zap_lookup_int(spa->spa_meta_objset, 2374 spa->spa_all_vdev_zaps, vd->vdev_top_zap)); 2375 } 2376 if (vd->vdev_leaf_zap != 0) { 2377 total++; 2378 ASSERT0(zap_lookup_int(spa->spa_meta_objset, 2379 spa->spa_all_vdev_zaps, vd->vdev_leaf_zap)); 2380 } 2381 2382 for (uint64_t i = 0; i < vd->vdev_children; i++) { 2383 total += vdev_count_verify_zaps(vd->vdev_child[i]); 2384 } 2385 2386 return (total); 2387} 2388 2389static int 2390spa_verify_host(spa_t *spa, nvlist_t *mos_config) 2391{ 2392 uint64_t hostid; 2393 char *hostname; 2394 uint64_t myhostid = 0; 2395 2396 if (!spa_is_root(spa) && nvlist_lookup_uint64(mos_config, 2397 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2398 hostname = fnvlist_lookup_string(mos_config, 2399 ZPOOL_CONFIG_HOSTNAME); 2400 2401 myhostid = zone_get_hostid(NULL); 2402 2403 if (hostid != 0 && myhostid != 0 && hostid != myhostid) { 2404 cmn_err(CE_WARN, "pool '%s' could not be " 2405 "loaded as it was last accessed by " 2406 "another system (host: %s hostid: 0x%llx). " 2407 "See: http://illumos.org/msg/ZFS-8000-EY", 2408 spa_name(spa), hostname, (u_longlong_t)hostid); 2409 spa_load_failed(spa, "hostid verification failed: pool " 2410 "last accessed by host: %s (hostid: 0x%llx)", 2411 hostname, (u_longlong_t)hostid); 2412 return (SET_ERROR(EBADF)); 2413 } 2414 } 2415 2416 return (0); 2417} 2418 2419static int 2420spa_ld_parse_config(spa_t *spa, spa_import_type_t type) 2421{ 2422 int error = 0; 2423 nvlist_t *nvtree, *nvl, *config = spa->spa_config; 2424 int parse; 2425 vdev_t *rvd; 2426 uint64_t pool_guid; 2427 char *comment; 2428 2429 /* 2430 * Versioning wasn't explicitly added to the label until later, so if 2431 * it's not present treat it as the initial version. 2432 */ 2433 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2434 &spa->spa_ubsync.ub_version) != 0) 2435 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2436 2437 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) { 2438 spa_load_failed(spa, "invalid config provided: '%s' missing", 2439 ZPOOL_CONFIG_POOL_GUID); 2440 return (SET_ERROR(EINVAL)); 2441 } 2442 2443 /* 2444 * If we are doing an import, ensure that the pool is not already 2445 * imported by checking if its pool guid already exists in the 2446 * spa namespace. 2447 * 2448 * The only case that we allow an already imported pool to be 2449 * imported again, is when the pool is checkpointed and we want to 2450 * look at its checkpointed state from userland tools like zdb. 2451 */ 2452#ifdef _KERNEL 2453 if ((spa->spa_load_state == SPA_LOAD_IMPORT || 2454 spa->spa_load_state == SPA_LOAD_TRYIMPORT) && 2455 spa_guid_exists(pool_guid, 0)) { 2456#else 2457 if ((spa->spa_load_state == SPA_LOAD_IMPORT || 2458 spa->spa_load_state == SPA_LOAD_TRYIMPORT) && 2459 spa_guid_exists(pool_guid, 0) && 2460 !spa_importing_readonly_checkpoint(spa)) { 2461#endif 2462 spa_load_failed(spa, "a pool with guid %llu is already open", 2463 (u_longlong_t)pool_guid); 2464 return (SET_ERROR(EEXIST)); 2465 } 2466 2467 spa->spa_config_guid = pool_guid; 2468 2469 nvlist_free(spa->spa_load_info); 2470 spa->spa_load_info = fnvlist_alloc(); 2471 2472 ASSERT(spa->spa_comment == NULL); 2473 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2474 spa->spa_comment = spa_strdup(comment); 2475 2476 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2477 &spa->spa_config_txg); 2478 2479 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) == 0) 2480 spa->spa_config_splitting = fnvlist_dup(nvl); 2481 2482 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvtree)) { 2483 spa_load_failed(spa, "invalid config provided: '%s' missing", 2484 ZPOOL_CONFIG_VDEV_TREE); 2485 return (SET_ERROR(EINVAL)); 2486 } 2487 2488 /* 2489 * Create "The Godfather" zio to hold all async IOs 2490 */ 2491 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2492 KM_SLEEP); 2493 for (int i = 0; i < max_ncpus; i++) { 2494 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2495 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2496 ZIO_FLAG_GODFATHER); 2497 } 2498 2499 /* 2500 * Parse the configuration into a vdev tree. We explicitly set the 2501 * value that will be returned by spa_version() since parsing the 2502 * configuration requires knowing the version number. 2503 */ 2504 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2505 parse = (type == SPA_IMPORT_EXISTING ? 2506 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2507 error = spa_config_parse(spa, &rvd, nvtree, NULL, 0, parse); 2508 spa_config_exit(spa, SCL_ALL, FTAG); 2509 2510 if (error != 0) { 2511 spa_load_failed(spa, "unable to parse config [error=%d]", 2512 error); 2513 return (error); 2514 } 2515 2516 ASSERT(spa->spa_root_vdev == rvd); 2517 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2518 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2519 2520 if (type != SPA_IMPORT_ASSEMBLE) { 2521 ASSERT(spa_guid(spa) == pool_guid); 2522 } 2523 2524 return (0); 2525} 2526 2527/* 2528 * Recursively open all vdevs in the vdev tree. This function is called twice: 2529 * first with the untrusted config, then with the trusted config. 2530 */ 2531static int 2532spa_ld_open_vdevs(spa_t *spa) 2533{ 2534 int error = 0; 2535 2536 /* 2537 * spa_missing_tvds_allowed defines how many top-level vdevs can be 2538 * missing/unopenable for the root vdev to be still considered openable. 2539 */ 2540 if (spa->spa_trust_config) { 2541 spa->spa_missing_tvds_allowed = zfs_max_missing_tvds; 2542 } else if (spa->spa_config_source == SPA_CONFIG_SRC_CACHEFILE) { 2543 spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_cachefile; 2544 } else if (spa->spa_config_source == SPA_CONFIG_SRC_SCAN) { 2545 spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_scan; 2546 } else { 2547 spa->spa_missing_tvds_allowed = 0; 2548 } 2549 2550 spa->spa_missing_tvds_allowed = 2551 MAX(zfs_max_missing_tvds, spa->spa_missing_tvds_allowed); 2552 2553 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2554 error = vdev_open(spa->spa_root_vdev); 2555 spa_config_exit(spa, SCL_ALL, FTAG); 2556 2557 if (spa->spa_missing_tvds != 0) { 2558 spa_load_note(spa, "vdev tree has %lld missing top-level " 2559 "vdevs.", (u_longlong_t)spa->spa_missing_tvds); 2560 if (spa->spa_trust_config && (spa->spa_mode & FWRITE)) { 2561 /* 2562 * Although theoretically we could allow users to open 2563 * incomplete pools in RW mode, we'd need to add a lot 2564 * of extra logic (e.g. adjust pool space to account 2565 * for missing vdevs). 2566 * This limitation also prevents users from accidentally 2567 * opening the pool in RW mode during data recovery and 2568 * damaging it further. 2569 */ 2570 spa_load_note(spa, "pools with missing top-level " 2571 "vdevs can only be opened in read-only mode."); 2572 error = SET_ERROR(ENXIO); 2573 } else { 2574 spa_load_note(spa, "current settings allow for maximum " 2575 "%lld missing top-level vdevs at this stage.", 2576 (u_longlong_t)spa->spa_missing_tvds_allowed); 2577 } 2578 } 2579 if (error != 0) { 2580 spa_load_failed(spa, "unable to open vdev tree [error=%d]", 2581 error); 2582 } 2583 if (spa->spa_missing_tvds != 0 || error != 0) 2584 vdev_dbgmsg_print_tree(spa->spa_root_vdev, 2); 2585 2586 return (error); 2587} 2588 2589/* 2590 * We need to validate the vdev labels against the configuration that 2591 * we have in hand. This function is called twice: first with an untrusted 2592 * config, then with a trusted config. The validation is more strict when the 2593 * config is trusted. 2594 */ 2595static int 2596spa_ld_validate_vdevs(spa_t *spa) 2597{ 2598 int error = 0; 2599 vdev_t *rvd = spa->spa_root_vdev; 2600 2601 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2602 error = vdev_validate(rvd); 2603 spa_config_exit(spa, SCL_ALL, FTAG); 2604 2605 if (error != 0) { 2606 spa_load_failed(spa, "vdev_validate failed [error=%d]", error); 2607 return (error); 2608 } 2609 2610 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) { 2611 spa_load_failed(spa, "cannot open vdev tree after invalidating " 2612 "some vdevs"); 2613 vdev_dbgmsg_print_tree(rvd, 2); 2614 return (SET_ERROR(ENXIO)); 2615 } 2616 2617 return (0); 2618} 2619 2620static void 2621spa_ld_select_uberblock_done(spa_t *spa, uberblock_t *ub) 2622{ 2623 spa->spa_state = POOL_STATE_ACTIVE; 2624 spa->spa_ubsync = spa->spa_uberblock; 2625 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2626 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2627 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2628 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2629 spa->spa_claim_max_txg = spa->spa_first_txg; 2630 spa->spa_prev_software_version = ub->ub_software_version; 2631} 2632 2633static int 2634spa_ld_select_uberblock(spa_t *spa, spa_import_type_t type) 2635{ 2636 vdev_t *rvd = spa->spa_root_vdev; 2637 nvlist_t *label; 2638 uberblock_t *ub = &spa->spa_uberblock; 2639 2640 /* 2641 * If we are opening the checkpointed state of the pool by 2642 * rewinding to it, at this point we will have written the 2643 * checkpointed uberblock to the vdev labels, so searching 2644 * the labels will find the right uberblock. However, if 2645 * we are opening the checkpointed state read-only, we have 2646 * not modified the labels. Therefore, we must ignore the 2647 * labels and continue using the spa_uberblock that was set 2648 * by spa_ld_checkpoint_rewind. 2649 * 2650 * Note that it would be fine to ignore the labels when 2651 * rewinding (opening writeable) as well. However, if we 2652 * crash just after writing the labels, we will end up 2653 * searching the labels. Doing so in the common case means 2654 * that this code path gets exercised normally, rather than 2655 * just in the edge case. 2656 */ 2657 if (ub->ub_checkpoint_txg != 0 && 2658 spa_importing_readonly_checkpoint(spa)) { 2659 spa_ld_select_uberblock_done(spa, ub); 2660 return (0); 2661 } 2662 2663 /* 2664 * Find the best uberblock. 2665 */ 2666 vdev_uberblock_load(rvd, ub, &label); 2667 2668 /* 2669 * If we weren't able to find a single valid uberblock, return failure. 2670 */ 2671 if (ub->ub_txg == 0) { 2672 nvlist_free(label); 2673 spa_load_failed(spa, "no valid uberblock found"); 2674 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2675 } 2676 2677 spa_load_note(spa, "using uberblock with txg=%llu", 2678 (u_longlong_t)ub->ub_txg); 2679 2680 /* 2681 * If the pool has an unsupported version we can't open it. 2682 */ 2683 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2684 nvlist_free(label); 2685 spa_load_failed(spa, "version %llu is not supported", 2686 (u_longlong_t)ub->ub_version); 2687 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2688 } 2689 2690 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2691 nvlist_t *features; 2692 2693 /* 2694 * If we weren't able to find what's necessary for reading the 2695 * MOS in the label, return failure. 2696 */ 2697 if (label == NULL) { 2698 spa_load_failed(spa, "label config unavailable"); 2699 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2700 ENXIO)); 2701 } 2702 2703 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_FEATURES_FOR_READ, 2704 &features) != 0) { 2705 nvlist_free(label); 2706 spa_load_failed(spa, "invalid label: '%s' missing", 2707 ZPOOL_CONFIG_FEATURES_FOR_READ); 2708 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2709 ENXIO)); 2710 } 2711 2712 /* 2713 * Update our in-core representation with the definitive values 2714 * from the label. 2715 */ 2716 nvlist_free(spa->spa_label_features); 2717 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2718 } 2719 2720 nvlist_free(label); 2721 2722 /* 2723 * Look through entries in the label nvlist's features_for_read. If 2724 * there is a feature listed there which we don't understand then we 2725 * cannot open a pool. 2726 */ 2727 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2728 nvlist_t *unsup_feat; 2729 2730 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2731 0); 2732 2733 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2734 NULL); nvp != NULL; 2735 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2736 if (!zfeature_is_supported(nvpair_name(nvp))) { 2737 VERIFY(nvlist_add_string(unsup_feat, 2738 nvpair_name(nvp), "") == 0); 2739 } 2740 } 2741 2742 if (!nvlist_empty(unsup_feat)) { 2743 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2744 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2745 nvlist_free(unsup_feat); 2746 spa_load_failed(spa, "some features are unsupported"); 2747 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2748 ENOTSUP)); 2749 } 2750 2751 nvlist_free(unsup_feat); 2752 } 2753 2754 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2755 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2756 spa_try_repair(spa, spa->spa_config); 2757 spa_config_exit(spa, SCL_ALL, FTAG); 2758 nvlist_free(spa->spa_config_splitting); 2759 spa->spa_config_splitting = NULL; 2760 } 2761 2762 /* 2763 * Initialize internal SPA structures. 2764 */ 2765 spa_ld_select_uberblock_done(spa, ub); 2766 2767 return (0); 2768} 2769 2770static int 2771spa_ld_open_rootbp(spa_t *spa) 2772{ 2773 int error = 0; 2774 vdev_t *rvd = spa->spa_root_vdev; 2775 2776 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2777 if (error != 0) { 2778 spa_load_failed(spa, "unable to open rootbp in dsl_pool_init " 2779 "[error=%d]", error); 2780 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2781 } 2782 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2783 2784 return (0); 2785} 2786 2787static int 2788spa_ld_trusted_config(spa_t *spa, spa_import_type_t type, 2789 boolean_t reloading) 2790{ 2791 vdev_t *mrvd, *rvd = spa->spa_root_vdev; 2792 nvlist_t *nv, *mos_config, *policy; 2793 int error = 0, copy_error; 2794 uint64_t healthy_tvds, healthy_tvds_mos; 2795 uint64_t mos_config_txg; 2796 2797 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object, B_TRUE) 2798 != 0) 2799 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2800 2801 /* 2802 * If we're assembling a pool from a split, the config provided is 2803 * already trusted so there is nothing to do. 2804 */ 2805 if (type == SPA_IMPORT_ASSEMBLE) 2806 return (0); 2807 2808 healthy_tvds = spa_healthy_core_tvds(spa); 2809 2810 if (load_nvlist(spa, spa->spa_config_object, &mos_config) 2811 != 0) { 2812 spa_load_failed(spa, "unable to retrieve MOS config"); 2813 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2814 } 2815 2816 /* 2817 * If we are doing an open, pool owner wasn't verified yet, thus do 2818 * the verification here. 2819 */ 2820 if (spa->spa_load_state == SPA_LOAD_OPEN) { 2821 error = spa_verify_host(spa, mos_config); 2822 if (error != 0) { 2823 nvlist_free(mos_config); 2824 return (error); 2825 } 2826 } 2827 2828 nv = fnvlist_lookup_nvlist(mos_config, ZPOOL_CONFIG_VDEV_TREE); 2829 2830 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2831 2832 /* 2833 * Build a new vdev tree from the trusted config 2834 */ 2835 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); 2836 2837 /* 2838 * Vdev paths in the MOS may be obsolete. If the untrusted config was 2839 * obtained by scanning /dev/dsk, then it will have the right vdev 2840 * paths. We update the trusted MOS config with this information. 2841 * We first try to copy the paths with vdev_copy_path_strict, which 2842 * succeeds only when both configs have exactly the same vdev tree. 2843 * If that fails, we fall back to a more flexible method that has a 2844 * best effort policy. 2845 */ 2846 copy_error = vdev_copy_path_strict(rvd, mrvd); 2847 if (copy_error != 0 || spa_load_print_vdev_tree) { 2848 spa_load_note(spa, "provided vdev tree:"); 2849 vdev_dbgmsg_print_tree(rvd, 2); 2850 spa_load_note(spa, "MOS vdev tree:"); 2851 vdev_dbgmsg_print_tree(mrvd, 2); 2852 } 2853 if (copy_error != 0) { 2854 spa_load_note(spa, "vdev_copy_path_strict failed, falling " 2855 "back to vdev_copy_path_relaxed"); 2856 vdev_copy_path_relaxed(rvd, mrvd); 2857 } 2858 2859 vdev_close(rvd); 2860 vdev_free(rvd); 2861 spa->spa_root_vdev = mrvd; 2862 rvd = mrvd; 2863 spa_config_exit(spa, SCL_ALL, FTAG); 2864 2865 /* 2866 * We will use spa_config if we decide to reload the spa or if spa_load 2867 * fails and we rewind. We must thus regenerate the config using the 2868 * MOS information with the updated paths. ZPOOL_LOAD_POLICY is used to 2869 * pass settings on how to load the pool and is not stored in the MOS. 2870 * We copy it over to our new, trusted config. 2871 */ 2872 mos_config_txg = fnvlist_lookup_uint64(mos_config, 2873 ZPOOL_CONFIG_POOL_TXG); 2874 nvlist_free(mos_config); 2875 mos_config = spa_config_generate(spa, NULL, mos_config_txg, B_FALSE); 2876 if (nvlist_lookup_nvlist(spa->spa_config, ZPOOL_LOAD_POLICY, 2877 &policy) == 0) 2878 fnvlist_add_nvlist(mos_config, ZPOOL_LOAD_POLICY, policy); 2879 spa_config_set(spa, mos_config); 2880 spa->spa_config_source = SPA_CONFIG_SRC_MOS; 2881 2882 /* 2883 * Now that we got the config from the MOS, we should be more strict 2884 * in checking blkptrs and can make assumptions about the consistency 2885 * of the vdev tree. spa_trust_config must be set to true before opening 2886 * vdevs in order for them to be writeable. 2887 */ 2888 spa->spa_trust_config = B_TRUE; 2889 2890 /* 2891 * Open and validate the new vdev tree 2892 */ 2893 error = spa_ld_open_vdevs(spa); 2894 if (error != 0) 2895 return (error); 2896 2897 error = spa_ld_validate_vdevs(spa); 2898 if (error != 0) 2899 return (error); 2900 2901 if (copy_error != 0 || spa_load_print_vdev_tree) { 2902 spa_load_note(spa, "final vdev tree:"); 2903 vdev_dbgmsg_print_tree(rvd, 2); 2904 } 2905 2906 if (spa->spa_load_state != SPA_LOAD_TRYIMPORT && 2907 !spa->spa_extreme_rewind && zfs_max_missing_tvds == 0) { 2908 /* 2909 * Sanity check to make sure that we are indeed loading the 2910 * latest uberblock. If we missed SPA_SYNC_MIN_VDEVS tvds 2911 * in the config provided and they happened to be the only ones 2912 * to have the latest uberblock, we could involuntarily perform 2913 * an extreme rewind. 2914 */ 2915 healthy_tvds_mos = spa_healthy_core_tvds(spa); 2916 if (healthy_tvds_mos - healthy_tvds >= 2917 SPA_SYNC_MIN_VDEVS) { 2918 spa_load_note(spa, "config provided misses too many " 2919 "top-level vdevs compared to MOS (%lld vs %lld). ", 2920 (u_longlong_t)healthy_tvds, 2921 (u_longlong_t)healthy_tvds_mos); 2922 spa_load_note(spa, "vdev tree:"); 2923 vdev_dbgmsg_print_tree(rvd, 2); 2924 if (reloading) { 2925 spa_load_failed(spa, "config was already " 2926 "provided from MOS. Aborting."); 2927 return (spa_vdev_err(rvd, 2928 VDEV_AUX_CORRUPT_DATA, EIO)); 2929 } 2930 spa_load_note(spa, "spa must be reloaded using MOS " 2931 "config"); 2932 return (SET_ERROR(EAGAIN)); 2933 } 2934 } 2935 2936 error = spa_check_for_missing_logs(spa); 2937 if (error != 0) 2938 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2939 2940 if (rvd->vdev_guid_sum != spa->spa_uberblock.ub_guid_sum) { 2941 spa_load_failed(spa, "uberblock guid sum doesn't match MOS " 2942 "guid sum (%llu != %llu)", 2943 (u_longlong_t)spa->spa_uberblock.ub_guid_sum, 2944 (u_longlong_t)rvd->vdev_guid_sum); 2945 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2946 ENXIO)); 2947 } 2948 2949 return (0); 2950} 2951 2952static int 2953spa_ld_open_indirect_vdev_metadata(spa_t *spa) 2954{ 2955 int error = 0; 2956 vdev_t *rvd = spa->spa_root_vdev; 2957 2958 /* 2959 * Everything that we read before spa_remove_init() must be stored 2960 * on concreted vdevs. Therefore we do this as early as possible. 2961 */ 2962 error = spa_remove_init(spa); 2963 if (error != 0) { 2964 spa_load_failed(spa, "spa_remove_init failed [error=%d]", 2965 error); 2966 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2967 } 2968 2969 /* 2970 * Retrieve information needed to condense indirect vdev mappings. 2971 */ 2972 error = spa_condense_init(spa); 2973 if (error != 0) { 2974 spa_load_failed(spa, "spa_condense_init failed [error=%d]", 2975 error); 2976 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); 2977 } 2978 2979 return (0); 2980} 2981 2982static int 2983spa_ld_check_features(spa_t *spa, boolean_t *missing_feat_writep) 2984{ 2985 int error = 0; 2986 vdev_t *rvd = spa->spa_root_vdev; 2987 2988 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2989 boolean_t missing_feat_read = B_FALSE; 2990 nvlist_t *unsup_feat, *enabled_feat; 2991 2992 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2993 &spa->spa_feat_for_read_obj, B_TRUE) != 0) { 2994 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2995 } 2996 2997 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2998 &spa->spa_feat_for_write_obj, B_TRUE) != 0) { 2999 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3000 } 3001 3002 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 3003 &spa->spa_feat_desc_obj, B_TRUE) != 0) { 3004 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3005 } 3006 3007 enabled_feat = fnvlist_alloc(); 3008 unsup_feat = fnvlist_alloc(); 3009 3010 if (!spa_features_check(spa, B_FALSE, 3011 unsup_feat, enabled_feat)) 3012 missing_feat_read = B_TRUE; 3013 3014 if (spa_writeable(spa) || 3015 spa->spa_load_state == SPA_LOAD_TRYIMPORT) { 3016 if (!spa_features_check(spa, B_TRUE, 3017 unsup_feat, enabled_feat)) { 3018 *missing_feat_writep = B_TRUE; 3019 } 3020 } 3021 3022 fnvlist_add_nvlist(spa->spa_load_info, 3023 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 3024 3025 if (!nvlist_empty(unsup_feat)) { 3026 fnvlist_add_nvlist(spa->spa_load_info, 3027 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 3028 } 3029 3030 fnvlist_free(enabled_feat); 3031 fnvlist_free(unsup_feat); 3032 3033 if (!missing_feat_read) { 3034 fnvlist_add_boolean(spa->spa_load_info, 3035 ZPOOL_CONFIG_CAN_RDONLY); 3036 } 3037 3038 /* 3039 * If the state is SPA_LOAD_TRYIMPORT, our objective is 3040 * twofold: to determine whether the pool is available for 3041 * import in read-write mode and (if it is not) whether the 3042 * pool is available for import in read-only mode. If the pool 3043 * is available for import in read-write mode, it is displayed 3044 * as available in userland; if it is not available for import 3045 * in read-only mode, it is displayed as unavailable in 3046 * userland. If the pool is available for import in read-only 3047 * mode but not read-write mode, it is displayed as unavailable 3048 * in userland with a special note that the pool is actually 3049 * available for open in read-only mode. 3050 * 3051 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 3052 * missing a feature for write, we must first determine whether 3053 * the pool can be opened read-only before returning to 3054 * userland in order to know whether to display the 3055 * abovementioned note. 3056 */ 3057 if (missing_feat_read || (*missing_feat_writep && 3058 spa_writeable(spa))) { 3059 spa_load_failed(spa, "pool uses unsupported features"); 3060 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 3061 ENOTSUP)); 3062 } 3063 3064 /* 3065 * Load refcounts for ZFS features from disk into an in-memory 3066 * cache during SPA initialization. 3067 */ 3068 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 3069 uint64_t refcount; 3070 3071 error = feature_get_refcount_from_disk(spa, 3072 &spa_feature_table[i], &refcount); 3073 if (error == 0) { 3074 spa->spa_feat_refcount_cache[i] = refcount; 3075 } else if (error == ENOTSUP) { 3076 spa->spa_feat_refcount_cache[i] = 3077 SPA_FEATURE_DISABLED; 3078 } else { 3079 spa_load_failed(spa, "error getting refcount " 3080 "for feature %s [error=%d]", 3081 spa_feature_table[i].fi_guid, error); 3082 return (spa_vdev_err(rvd, 3083 VDEV_AUX_CORRUPT_DATA, EIO)); 3084 } 3085 } 3086 } 3087 3088 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 3089 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 3090 &spa->spa_feat_enabled_txg_obj, B_TRUE) != 0) 3091 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3092 } 3093 3094 return (0); 3095} 3096 3097static int 3098spa_ld_load_special_directories(spa_t *spa) 3099{ 3100 int error = 0; 3101 vdev_t *rvd = spa->spa_root_vdev; 3102 3103 spa->spa_is_initializing = B_TRUE; 3104 error = dsl_pool_open(spa->spa_dsl_pool); 3105 spa->spa_is_initializing = B_FALSE; 3106 if (error != 0) { 3107 spa_load_failed(spa, "dsl_pool_open failed [error=%d]", error); 3108 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3109 } 3110 3111 return (0); 3112} 3113 3114static int 3115spa_ld_get_props(spa_t *spa) 3116{ 3117 int error = 0; 3118 uint64_t obj; 3119 vdev_t *rvd = spa->spa_root_vdev; 3120 3121 /* Grab the secret checksum salt from the MOS. */ 3122 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 3123 DMU_POOL_CHECKSUM_SALT, 1, 3124 sizeof (spa->spa_cksum_salt.zcs_bytes), 3125 spa->spa_cksum_salt.zcs_bytes); 3126 if (error == ENOENT) { 3127 /* Generate a new salt for subsequent use */ 3128 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 3129 sizeof (spa->spa_cksum_salt.zcs_bytes)); 3130 } else if (error != 0) { 3131 spa_load_failed(spa, "unable to retrieve checksum salt from " 3132 "MOS [error=%d]", error); 3133 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3134 } 3135 3136 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj, B_TRUE) != 0) 3137 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3138 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 3139 if (error != 0) { 3140 spa_load_failed(spa, "error opening deferred-frees bpobj " 3141 "[error=%d]", error); 3142 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3143 } 3144 3145 /* 3146 * Load the bit that tells us to use the new accounting function 3147 * (raid-z deflation). If we have an older pool, this will not 3148 * be present. 3149 */ 3150 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate, B_FALSE); 3151 if (error != 0 && error != ENOENT) 3152 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3153 3154 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 3155 &spa->spa_creation_version, B_FALSE); 3156 if (error != 0 && error != ENOENT) 3157 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3158 3159 /* 3160 * Load the persistent error log. If we have an older pool, this will 3161 * not be present. 3162 */ 3163 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last, 3164 B_FALSE); 3165 if (error != 0 && error != ENOENT) 3166 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3167 3168 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 3169 &spa->spa_errlog_scrub, B_FALSE); 3170 if (error != 0 && error != ENOENT) 3171 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3172 3173 /* 3174 * Load the history object. If we have an older pool, this 3175 * will not be present. 3176 */ 3177 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history, B_FALSE); 3178 if (error != 0 && error != ENOENT) 3179 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3180 3181 /* 3182 * Load the per-vdev ZAP map. If we have an older pool, this will not 3183 * be present; in this case, defer its creation to a later time to 3184 * avoid dirtying the MOS this early / out of sync context. See 3185 * spa_sync_config_object. 3186 */ 3187 3188 /* The sentinel is only available in the MOS config. */ 3189 nvlist_t *mos_config; 3190 if (load_nvlist(spa, spa->spa_config_object, &mos_config) != 0) { 3191 spa_load_failed(spa, "unable to retrieve MOS config"); 3192 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3193 } 3194 3195 error = spa_dir_prop(spa, DMU_POOL_VDEV_ZAP_MAP, 3196 &spa->spa_all_vdev_zaps, B_FALSE); 3197 3198 if (error == ENOENT) { 3199 VERIFY(!nvlist_exists(mos_config, 3200 ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); 3201 spa->spa_avz_action = AVZ_ACTION_INITIALIZE; 3202 ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); 3203 } else if (error != 0) { 3204 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3205 } else if (!nvlist_exists(mos_config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)) { 3206 /* 3207 * An older version of ZFS overwrote the sentinel value, so 3208 * we have orphaned per-vdev ZAPs in the MOS. Defer their 3209 * destruction to later; see spa_sync_config_object. 3210 */ 3211 spa->spa_avz_action = AVZ_ACTION_DESTROY; 3212 /* 3213 * We're assuming that no vdevs have had their ZAPs created 3214 * before this. Better be sure of it. 3215 */ 3216 ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); 3217 } 3218 nvlist_free(mos_config); 3219 3220 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3221 3222 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object, 3223 B_FALSE); 3224 if (error && error != ENOENT) 3225 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3226 3227 if (error == 0) { 3228 uint64_t autoreplace; 3229 3230 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 3231 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 3232 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 3233 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 3234 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 3235 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 3236 &spa->spa_dedup_ditto); 3237 3238 spa->spa_autoreplace = (autoreplace != 0); 3239 } 3240 3241 /* 3242 * If we are importing a pool with missing top-level vdevs, 3243 * we enforce that the pool doesn't panic or get suspended on 3244 * error since the likelihood of missing data is extremely high. 3245 */ 3246 if (spa->spa_missing_tvds > 0 && 3247 spa->spa_failmode != ZIO_FAILURE_MODE_CONTINUE && 3248 spa->spa_load_state != SPA_LOAD_TRYIMPORT) { 3249 spa_load_note(spa, "forcing failmode to 'continue' " 3250 "as some top level vdevs are missing"); 3251 spa->spa_failmode = ZIO_FAILURE_MODE_CONTINUE; 3252 } 3253 3254 return (0); 3255} 3256 3257static int 3258spa_ld_open_aux_vdevs(spa_t *spa, spa_import_type_t type) 3259{ 3260 int error = 0; 3261 vdev_t *rvd = spa->spa_root_vdev; 3262 3263 /* 3264 * If we're assembling the pool from the split-off vdevs of 3265 * an existing pool, we don't want to attach the spares & cache 3266 * devices. 3267 */ 3268 3269 /* 3270 * Load any hot spares for this pool. 3271 */ 3272 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object, 3273 B_FALSE); 3274 if (error != 0 && error != ENOENT) 3275 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3276 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 3277 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 3278 if (load_nvlist(spa, spa->spa_spares.sav_object, 3279 &spa->spa_spares.sav_config) != 0) { 3280 spa_load_failed(spa, "error loading spares nvlist"); 3281 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3282 } 3283 3284 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3285 spa_load_spares(spa); 3286 spa_config_exit(spa, SCL_ALL, FTAG); 3287 } else if (error == 0) { 3288 spa->spa_spares.sav_sync = B_TRUE; 3289 } 3290 3291 /* 3292 * Load any level 2 ARC devices for this pool. 3293 */ 3294 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 3295 &spa->spa_l2cache.sav_object, B_FALSE); 3296 if (error != 0 && error != ENOENT) 3297 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3298 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 3299 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 3300 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 3301 &spa->spa_l2cache.sav_config) != 0) { 3302 spa_load_failed(spa, "error loading l2cache nvlist"); 3303 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3304 } 3305 3306 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3307 spa_load_l2cache(spa); 3308 spa_config_exit(spa, SCL_ALL, FTAG); 3309 } else if (error == 0) { 3310 spa->spa_l2cache.sav_sync = B_TRUE; 3311 } 3312 3313 return (0); 3314} 3315 3316static int 3317spa_ld_load_vdev_metadata(spa_t *spa) 3318{ 3319 int error = 0; 3320 vdev_t *rvd = spa->spa_root_vdev; 3321 3322 /* 3323 * If the 'autoreplace' property is set, then post a resource notifying 3324 * the ZFS DE that it should not issue any faults for unopenable 3325 * devices. We also iterate over the vdevs, and post a sysevent for any 3326 * unopenable vdevs so that the normal autoreplace handler can take 3327 * over. 3328 */ 3329 if (spa->spa_autoreplace && spa->spa_load_state != SPA_LOAD_TRYIMPORT) { 3330 spa_check_removed(spa->spa_root_vdev); 3331 /* 3332 * For the import case, this is done in spa_import(), because 3333 * at this point we're using the spare definitions from 3334 * the MOS config, not necessarily from the userland config. 3335 */ 3336 if (spa->spa_load_state != SPA_LOAD_IMPORT) { 3337 spa_aux_check_removed(&spa->spa_spares); 3338 spa_aux_check_removed(&spa->spa_l2cache); 3339 } 3340 } 3341 3342 /* 3343 * Load the vdev metadata such as metaslabs, DTLs, spacemap object, etc. 3344 */ 3345 error = vdev_load(rvd); 3346 if (error != 0) { 3347 spa_load_failed(spa, "vdev_load failed [error=%d]", error); 3348 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); 3349 } 3350 3351 /* 3352 * Propagate the leaf DTLs we just loaded all the way up the vdev tree. 3353 */ 3354 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3355 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 3356 spa_config_exit(spa, SCL_ALL, FTAG); 3357 3358 return (0); 3359} 3360 3361static int 3362spa_ld_load_dedup_tables(spa_t *spa) 3363{ 3364 int error = 0; 3365 vdev_t *rvd = spa->spa_root_vdev; 3366 3367 error = ddt_load(spa); 3368 if (error != 0) { 3369 spa_load_failed(spa, "ddt_load failed [error=%d]", error); 3370 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3371 } 3372 3373 return (0); 3374} 3375 3376static int 3377spa_ld_verify_logs(spa_t *spa, spa_import_type_t type, char **ereport) 3378{ 3379 vdev_t *rvd = spa->spa_root_vdev; 3380 3381 if (type != SPA_IMPORT_ASSEMBLE && spa_writeable(spa)) { 3382 boolean_t missing = spa_check_logs(spa); 3383 if (missing) { 3384 if (spa->spa_missing_tvds != 0) { 3385 spa_load_note(spa, "spa_check_logs failed " 3386 "so dropping the logs"); 3387 } else { 3388 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 3389 spa_load_failed(spa, "spa_check_logs failed"); 3390 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, 3391 ENXIO)); 3392 } 3393 } 3394 } 3395 3396 return (0); 3397} 3398 3399static int 3400spa_ld_verify_pool_data(spa_t *spa) 3401{ 3402 int error = 0; 3403 vdev_t *rvd = spa->spa_root_vdev; 3404 3405 /* 3406 * We've successfully opened the pool, verify that we're ready 3407 * to start pushing transactions. 3408 */ 3409 if (spa->spa_load_state != SPA_LOAD_TRYIMPORT) { 3410 error = spa_load_verify(spa); 3411 if (error != 0) { 3412 spa_load_failed(spa, "spa_load_verify failed " 3413 "[error=%d]", error); 3414 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 3415 error)); 3416 } 3417 } 3418 3419 return (0); 3420} 3421 3422static void 3423spa_ld_claim_log_blocks(spa_t *spa) 3424{ 3425 dmu_tx_t *tx; 3426 dsl_pool_t *dp = spa_get_dsl(spa); 3427 3428 /* 3429 * Claim log blocks that haven't been committed yet. 3430 * This must all happen in a single txg. 3431 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 3432 * invoked from zil_claim_log_block()'s i/o done callback. 3433 * Price of rollback is that we abandon the log. 3434 */ 3435 spa->spa_claiming = B_TRUE; 3436 3437 tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); 3438 (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 3439 zil_claim, tx, DS_FIND_CHILDREN); 3440 dmu_tx_commit(tx); 3441 3442 spa->spa_claiming = B_FALSE; 3443 3444 spa_set_log_state(spa, SPA_LOG_GOOD); 3445} 3446 3447static void 3448spa_ld_check_for_config_update(spa_t *spa, uint64_t config_cache_txg, 3449 boolean_t update_config_cache) 3450{ 3451 vdev_t *rvd = spa->spa_root_vdev; 3452 int need_update = B_FALSE; 3453 3454 /* 3455 * If the config cache is stale, or we have uninitialized 3456 * metaslabs (see spa_vdev_add()), then update the config. 3457 * 3458 * If this is a verbatim import, trust the current 3459 * in-core spa_config and update the disk labels. 3460 */ 3461 if (update_config_cache || config_cache_txg != spa->spa_config_txg || 3462 spa->spa_load_state == SPA_LOAD_IMPORT || 3463 spa->spa_load_state == SPA_LOAD_RECOVER || 3464 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 3465 need_update = B_TRUE; 3466 3467 for (int c = 0; c < rvd->vdev_children; c++) 3468 if (rvd->vdev_child[c]->vdev_ms_array == 0) 3469 need_update = B_TRUE; 3470 3471 /* 3472 * Update the config cache asychronously in case we're the 3473 * root pool, in which case the config cache isn't writable yet. 3474 */ 3475 if (need_update) 3476 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 3477} 3478 3479static void 3480spa_ld_prepare_for_reload(spa_t *spa) 3481{ 3482 int mode = spa->spa_mode; 3483 int async_suspended = spa->spa_async_suspended; 3484 3485 spa_unload(spa); 3486 spa_deactivate(spa); 3487 spa_activate(spa, mode); 3488 3489 /* 3490 * We save the value of spa_async_suspended as it gets reset to 0 by 3491 * spa_unload(). We want to restore it back to the original value before 3492 * returning as we might be calling spa_async_resume() later. 3493 */ 3494 spa->spa_async_suspended = async_suspended; 3495} 3496 3497static int 3498spa_ld_read_checkpoint_txg(spa_t *spa) 3499{ 3500 uberblock_t checkpoint; 3501 int error = 0; 3502 3503 ASSERT0(spa->spa_checkpoint_txg); 3504 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3505 3506 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 3507 DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t), 3508 sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint); 3509 3510 if (error == ENOENT) 3511 return (0); 3512 3513 if (error != 0) 3514 return (error); 3515 3516 ASSERT3U(checkpoint.ub_txg, !=, 0); 3517 ASSERT3U(checkpoint.ub_checkpoint_txg, !=, 0); 3518 ASSERT3U(checkpoint.ub_timestamp, !=, 0); 3519 spa->spa_checkpoint_txg = checkpoint.ub_txg; 3520 spa->spa_checkpoint_info.sci_timestamp = checkpoint.ub_timestamp; 3521 3522 return (0); 3523} 3524 3525static int 3526spa_ld_mos_init(spa_t *spa, spa_import_type_t type) 3527{ 3528 int error = 0; 3529 3530 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3531 ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE); 3532 3533 /* 3534 * Never trust the config that is provided unless we are assembling 3535 * a pool following a split. 3536 * This means don't trust blkptrs and the vdev tree in general. This 3537 * also effectively puts the spa in read-only mode since 3538 * spa_writeable() checks for spa_trust_config to be true. 3539 * We will later load a trusted config from the MOS. 3540 */ 3541 if (type != SPA_IMPORT_ASSEMBLE) 3542 spa->spa_trust_config = B_FALSE; 3543 3544 /* 3545 * Parse the config provided to create a vdev tree. 3546 */ 3547 error = spa_ld_parse_config(spa, type); 3548 if (error != 0) 3549 return (error); 3550 3551 /* 3552 * Now that we have the vdev tree, try to open each vdev. This involves 3553 * opening the underlying physical device, retrieving its geometry and 3554 * probing the vdev with a dummy I/O. The state of each vdev will be set 3555 * based on the success of those operations. After this we'll be ready 3556 * to read from the vdevs. 3557 */ 3558 error = spa_ld_open_vdevs(spa); 3559 if (error != 0) 3560 return (error); 3561 3562 /* 3563 * Read the label of each vdev and make sure that the GUIDs stored 3564 * there match the GUIDs in the config provided. 3565 * If we're assembling a new pool that's been split off from an 3566 * existing pool, the labels haven't yet been updated so we skip 3567 * validation for now. 3568 */ 3569 if (type != SPA_IMPORT_ASSEMBLE) { 3570 error = spa_ld_validate_vdevs(spa); 3571 if (error != 0) 3572 return (error); 3573 } 3574 3575 /* 3576 * Read all vdev labels to find the best uberblock (i.e. latest, 3577 * unless spa_load_max_txg is set) and store it in spa_uberblock. We 3578 * get the list of features required to read blkptrs in the MOS from 3579 * the vdev label with the best uberblock and verify that our version 3580 * of zfs supports them all. 3581 */ 3582 error = spa_ld_select_uberblock(spa, type); 3583 if (error != 0) 3584 return (error); 3585 3586 /* 3587 * Pass that uberblock to the dsl_pool layer which will open the root 3588 * blkptr. This blkptr points to the latest version of the MOS and will 3589 * allow us to read its contents. 3590 */ 3591 error = spa_ld_open_rootbp(spa); 3592 if (error != 0) 3593 return (error); 3594 3595 return (0); 3596} 3597 3598static int 3599spa_ld_checkpoint_rewind(spa_t *spa) 3600{ 3601 uberblock_t checkpoint; 3602 int error = 0; 3603 3604 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3605 ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); 3606 3607 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 3608 DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t), 3609 sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint); 3610 3611 if (error != 0) { 3612 spa_load_failed(spa, "unable to retrieve checkpointed " 3613 "uberblock from the MOS config [error=%d]", error); 3614 3615 if (error == ENOENT) 3616 error = ZFS_ERR_NO_CHECKPOINT; 3617 3618 return (error); 3619 } 3620 3621 ASSERT3U(checkpoint.ub_txg, <, spa->spa_uberblock.ub_txg); 3622 ASSERT3U(checkpoint.ub_txg, ==, checkpoint.ub_checkpoint_txg); 3623 3624 /* 3625 * We need to update the txg and timestamp of the checkpointed 3626 * uberblock to be higher than the latest one. This ensures that 3627 * the checkpointed uberblock is selected if we were to close and 3628 * reopen the pool right after we've written it in the vdev labels. 3629 * (also see block comment in vdev_uberblock_compare) 3630 */ 3631 checkpoint.ub_txg = spa->spa_uberblock.ub_txg + 1; 3632 checkpoint.ub_timestamp = gethrestime_sec(); 3633 3634 /* 3635 * Set current uberblock to be the checkpointed uberblock. 3636 */ 3637 spa->spa_uberblock = checkpoint; 3638 3639 /* 3640 * If we are doing a normal rewind, then the pool is open for 3641 * writing and we sync the "updated" checkpointed uberblock to 3642 * disk. Once this is done, we've basically rewound the whole 3643 * pool and there is no way back. 3644 * 3645 * There are cases when we don't want to attempt and sync the 3646 * checkpointed uberblock to disk because we are opening a 3647 * pool as read-only. Specifically, verifying the checkpointed 3648 * state with zdb, and importing the checkpointed state to get 3649 * a "preview" of its content. 3650 */ 3651 if (spa_writeable(spa)) { 3652 vdev_t *rvd = spa->spa_root_vdev; 3653 3654 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3655 vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL }; 3656 int svdcount = 0; 3657 int children = rvd->vdev_children; 3658 int c0 = spa_get_random(children); 3659 3660 for (int c = 0; c < children; c++) { 3661 vdev_t *vd = rvd->vdev_child[(c0 + c) % children]; 3662 3663 /* Stop when revisiting the first vdev */ 3664 if (c > 0 && svd[0] == vd) 3665 break; 3666 3667 if (vd->vdev_ms_array == 0 || vd->vdev_islog || 3668 !vdev_is_concrete(vd)) 3669 continue; 3670 3671 svd[svdcount++] = vd; 3672 if (svdcount == SPA_SYNC_MIN_VDEVS) 3673 break; 3674 } 3675 error = vdev_config_sync(svd, svdcount, spa->spa_first_txg); 3676 if (error == 0) 3677 spa->spa_last_synced_guid = rvd->vdev_guid; 3678 spa_config_exit(spa, SCL_ALL, FTAG); 3679 3680 if (error != 0) { 3681 spa_load_failed(spa, "failed to write checkpointed " 3682 "uberblock to the vdev labels [error=%d]", error); 3683 return (error); 3684 } 3685 } 3686 3687 return (0); 3688} 3689 3690static int 3691spa_ld_mos_with_trusted_config(spa_t *spa, spa_import_type_t type, 3692 boolean_t *update_config_cache) 3693{ 3694 int error; 3695 3696 /* 3697 * Parse the config for pool, open and validate vdevs, 3698 * select an uberblock, and use that uberblock to open 3699 * the MOS. 3700 */ 3701 error = spa_ld_mos_init(spa, type); 3702 if (error != 0) 3703 return (error); 3704 3705 /* 3706 * Retrieve the trusted config stored in the MOS and use it to create 3707 * a new, exact version of the vdev tree, then reopen all vdevs. 3708 */ 3709 error = spa_ld_trusted_config(spa, type, B_FALSE); 3710 if (error == EAGAIN) { 3711 if (update_config_cache != NULL) 3712 *update_config_cache = B_TRUE; 3713 3714 /* 3715 * Redo the loading process with the trusted config if it is 3716 * too different from the untrusted config. 3717 */ 3718 spa_ld_prepare_for_reload(spa); 3719 spa_load_note(spa, "RELOADING"); 3720 error = spa_ld_mos_init(spa, type); 3721 if (error != 0) 3722 return (error); 3723 3724 error = spa_ld_trusted_config(spa, type, B_TRUE); 3725 if (error != 0) 3726 return (error); 3727 3728 } else if (error != 0) { 3729 return (error); 3730 } 3731 3732 return (0); 3733} 3734 3735/* 3736 * Load an existing storage pool, using the config provided. This config 3737 * describes which vdevs are part of the pool and is later validated against 3738 * partial configs present in each vdev's label and an entire copy of the 3739 * config stored in the MOS. 3740 */ 3741static int 3742spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport) 3743{ 3744 int error = 0; 3745 boolean_t missing_feat_write = B_FALSE; 3746 boolean_t checkpoint_rewind = 3747 (spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); 3748 boolean_t update_config_cache = B_FALSE; 3749 3750 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3751 ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE); 3752 3753 spa_load_note(spa, "LOADING"); 3754 3755 error = spa_ld_mos_with_trusted_config(spa, type, &update_config_cache); 3756 if (error != 0) 3757 return (error); 3758 3759 /* 3760 * If we are rewinding to the checkpoint then we need to repeat 3761 * everything we've done so far in this function but this time 3762 * selecting the checkpointed uberblock and using that to open 3763 * the MOS. 3764 */ 3765 if (checkpoint_rewind) { 3766 /* 3767 * If we are rewinding to the checkpoint update config cache 3768 * anyway. 3769 */ 3770 update_config_cache = B_TRUE; 3771 3772 /* 3773 * Extract the checkpointed uberblock from the current MOS 3774 * and use this as the pool's uberblock from now on. If the 3775 * pool is imported as writeable we also write the checkpoint 3776 * uberblock to the labels, making the rewind permanent. 3777 */ 3778 error = spa_ld_checkpoint_rewind(spa); 3779 if (error != 0) 3780 return (error); 3781 3782 /* 3783 * Redo the loading process process again with the 3784 * checkpointed uberblock. 3785 */ 3786 spa_ld_prepare_for_reload(spa); 3787 spa_load_note(spa, "LOADING checkpointed uberblock"); 3788 error = spa_ld_mos_with_trusted_config(spa, type, NULL); 3789 if (error != 0) 3790 return (error); 3791 } 3792 3793 /* 3794 * Retrieve the checkpoint txg if the pool has a checkpoint. 3795 */ 3796 error = spa_ld_read_checkpoint_txg(spa); 3797 if (error != 0) 3798 return (error); 3799 3800 /* 3801 * Retrieve the mapping of indirect vdevs. Those vdevs were removed 3802 * from the pool and their contents were re-mapped to other vdevs. Note 3803 * that everything that we read before this step must have been 3804 * rewritten on concrete vdevs after the last device removal was 3805 * initiated. Otherwise we could be reading from indirect vdevs before 3806 * we have loaded their mappings. 3807 */ 3808 error = spa_ld_open_indirect_vdev_metadata(spa); 3809 if (error != 0) 3810 return (error); 3811 3812 /* 3813 * Retrieve the full list of active features from the MOS and check if 3814 * they are all supported. 3815 */ 3816 error = spa_ld_check_features(spa, &missing_feat_write); 3817 if (error != 0) 3818 return (error); 3819 3820 /* 3821 * Load several special directories from the MOS needed by the dsl_pool 3822 * layer. 3823 */ 3824 error = spa_ld_load_special_directories(spa); 3825 if (error != 0) 3826 return (error); 3827 3828 /* 3829 * Retrieve pool properties from the MOS. 3830 */ 3831 error = spa_ld_get_props(spa); 3832 if (error != 0) 3833 return (error); 3834 3835 /* 3836 * Retrieve the list of auxiliary devices - cache devices and spares - 3837 * and open them. 3838 */ 3839 error = spa_ld_open_aux_vdevs(spa, type); 3840 if (error != 0) 3841 return (error); 3842 3843 /* 3844 * Load the metadata for all vdevs. Also check if unopenable devices 3845 * should be autoreplaced. 3846 */ 3847 error = spa_ld_load_vdev_metadata(spa); 3848 if (error != 0) 3849 return (error); 3850 3851 error = spa_ld_load_dedup_tables(spa); 3852 if (error != 0) 3853 return (error); 3854 3855 /* 3856 * Verify the logs now to make sure we don't have any unexpected errors 3857 * when we claim log blocks later. 3858 */ 3859 error = spa_ld_verify_logs(spa, type, ereport); 3860 if (error != 0) 3861 return (error); 3862 3863 if (missing_feat_write) { 3864 ASSERT(spa->spa_load_state == SPA_LOAD_TRYIMPORT); 3865 3866 /* 3867 * At this point, we know that we can open the pool in 3868 * read-only mode but not read-write mode. We now have enough 3869 * information and can return to userland. 3870 */ 3871 return (spa_vdev_err(spa->spa_root_vdev, VDEV_AUX_UNSUP_FEAT, 3872 ENOTSUP)); 3873 } 3874 3875 /* 3876 * Traverse the last txgs to make sure the pool was left off in a safe 3877 * state. When performing an extreme rewind, we verify the whole pool, 3878 * which can take a very long time. 3879 */ 3880 error = spa_ld_verify_pool_data(spa); 3881 if (error != 0) 3882 return (error); 3883 3884 /* 3885 * Calculate the deflated space for the pool. This must be done before 3886 * we write anything to the pool because we'd need to update the space 3887 * accounting using the deflated sizes. 3888 */ 3889 spa_update_dspace(spa); 3890 3891 /* 3892 * We have now retrieved all the information we needed to open the 3893 * pool. If we are importing the pool in read-write mode, a few 3894 * additional steps must be performed to finish the import. 3895 */ 3896 if (spa_writeable(spa) && (spa->spa_load_state == SPA_LOAD_RECOVER || 3897 spa->spa_load_max_txg == UINT64_MAX)) { 3898 uint64_t config_cache_txg = spa->spa_config_txg; 3899 3900 ASSERT(spa->spa_load_state != SPA_LOAD_TRYIMPORT); 3901 3902 /* 3903 * In case of a checkpoint rewind, log the original txg 3904 * of the checkpointed uberblock. 3905 */ 3906 if (checkpoint_rewind) { 3907 spa_history_log_internal(spa, "checkpoint rewind", 3908 NULL, "rewound state to txg=%llu", 3909 (u_longlong_t)spa->spa_uberblock.ub_checkpoint_txg); 3910 } 3911 3912 /* 3913 * Traverse the ZIL and claim all blocks. 3914 */ 3915 spa_ld_claim_log_blocks(spa); 3916 3917 /* 3918 * Kick-off the syncing thread. 3919 */ 3920 spa->spa_sync_on = B_TRUE; 3921 txg_sync_start(spa->spa_dsl_pool); 3922 3923 /* 3924 * Wait for all claims to sync. We sync up to the highest 3925 * claimed log block birth time so that claimed log blocks 3926 * don't appear to be from the future. spa_claim_max_txg 3927 * will have been set for us by ZIL traversal operations 3928 * performed above. 3929 */ 3930 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 3931 3932 /* 3933 * Check if we need to request an update of the config. On the 3934 * next sync, we would update the config stored in vdev labels 3935 * and the cachefile (by default /etc/zfs/zpool.cache). 3936 */ 3937 spa_ld_check_for_config_update(spa, config_cache_txg, 3938 update_config_cache); 3939 3940 /* 3941 * Check all DTLs to see if anything needs resilvering. 3942 */ 3943 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 3944 vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) 3945 spa_async_request(spa, SPA_ASYNC_RESILVER); 3946 3947 /* 3948 * Log the fact that we booted up (so that we can detect if 3949 * we rebooted in the middle of an operation). 3950 */ 3951 spa_history_log_version(spa, "open"); 3952 3953 /* 3954 * Delete any inconsistent datasets. 3955 */ 3956 (void) dmu_objset_find(spa_name(spa), 3957 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 3958 3959 /* 3960 * Clean up any stale temporary dataset userrefs. 3961 */ 3962 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 3963 3964 spa_restart_removal(spa); 3965 3966 spa_spawn_aux_threads(spa); 3967 3968 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 3969 vdev_initialize_restart(spa->spa_root_vdev); 3970 spa_config_exit(spa, SCL_CONFIG, FTAG); 3971 } 3972 3973 spa_load_note(spa, "LOADED"); 3974 3975 return (0); 3976} 3977 3978static int 3979spa_load_retry(spa_t *spa, spa_load_state_t state) 3980{ 3981 int mode = spa->spa_mode; 3982 3983 spa_unload(spa); 3984 spa_deactivate(spa); 3985 3986 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 3987 3988 spa_activate(spa, mode); 3989 spa_async_suspend(spa); 3990 3991 spa_load_note(spa, "spa_load_retry: rewind, max txg: %llu", 3992 (u_longlong_t)spa->spa_load_max_txg); 3993 3994 return (spa_load(spa, state, SPA_IMPORT_EXISTING)); 3995} 3996 3997/* 3998 * If spa_load() fails this function will try loading prior txg's. If 3999 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 4000 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 4001 * function will not rewind the pool and will return the same error as 4002 * spa_load(). 4003 */ 4004static int 4005spa_load_best(spa_t *spa, spa_load_state_t state, uint64_t max_request, 4006 int rewind_flags) 4007{ 4008 nvlist_t *loadinfo = NULL; 4009 nvlist_t *config = NULL; 4010 int load_error, rewind_error; 4011 uint64_t safe_rewind_txg; 4012 uint64_t min_txg; 4013 4014 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 4015 spa->spa_load_max_txg = spa->spa_load_txg; 4016 spa_set_log_state(spa, SPA_LOG_CLEAR); 4017 } else { 4018 spa->spa_load_max_txg = max_request; 4019 if (max_request != UINT64_MAX) 4020 spa->spa_extreme_rewind = B_TRUE; 4021 } 4022 4023 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING); 4024 if (load_error == 0) 4025 return (0); 4026 if (load_error == ZFS_ERR_NO_CHECKPOINT) { 4027 /* 4028 * When attempting checkpoint-rewind on a pool with no 4029 * checkpoint, we should not attempt to load uberblocks 4030 * from previous txgs when spa_load fails. 4031 */ 4032 ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); 4033 return (load_error); 4034 } 4035 4036 if (spa->spa_root_vdev != NULL) 4037 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4038 4039 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 4040 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 4041 4042 if (rewind_flags & ZPOOL_NEVER_REWIND) { 4043 nvlist_free(config); 4044 return (load_error); 4045 } 4046 4047 if (state == SPA_LOAD_RECOVER) { 4048 /* Price of rolling back is discarding txgs, including log */ 4049 spa_set_log_state(spa, SPA_LOG_CLEAR); 4050 } else { 4051 /* 4052 * If we aren't rolling back save the load info from our first 4053 * import attempt so that we can restore it after attempting 4054 * to rewind. 4055 */ 4056 loadinfo = spa->spa_load_info; 4057 spa->spa_load_info = fnvlist_alloc(); 4058 } 4059 4060 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 4061 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 4062 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 4063 TXG_INITIAL : safe_rewind_txg; 4064 4065 /* 4066 * Continue as long as we're finding errors, we're still within 4067 * the acceptable rewind range, and we're still finding uberblocks 4068 */ 4069 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 4070 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 4071 if (spa->spa_load_max_txg < safe_rewind_txg) 4072 spa->spa_extreme_rewind = B_TRUE; 4073 rewind_error = spa_load_retry(spa, state); 4074 } 4075 4076 spa->spa_extreme_rewind = B_FALSE; 4077 spa->spa_load_max_txg = UINT64_MAX; 4078 4079 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 4080 spa_config_set(spa, config); 4081 else 4082 nvlist_free(config); 4083 4084 if (state == SPA_LOAD_RECOVER) { 4085 ASSERT3P(loadinfo, ==, NULL); 4086 return (rewind_error); 4087 } else { 4088 /* Store the rewind info as part of the initial load info */ 4089 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 4090 spa->spa_load_info); 4091 4092 /* Restore the initial load info */ 4093 fnvlist_free(spa->spa_load_info); 4094 spa->spa_load_info = loadinfo; 4095 4096 return (load_error); 4097 } 4098} 4099 4100/* 4101 * Pool Open/Import 4102 * 4103 * The import case is identical to an open except that the configuration is sent 4104 * down from userland, instead of grabbed from the configuration cache. For the 4105 * case of an open, the pool configuration will exist in the 4106 * POOL_STATE_UNINITIALIZED state. 4107 * 4108 * The stats information (gen/count/ustats) is used to gather vdev statistics at 4109 * the same time open the pool, without having to keep around the spa_t in some 4110 * ambiguous state. 4111 */ 4112static int 4113spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 4114 nvlist_t **config) 4115{ 4116 spa_t *spa; 4117 spa_load_state_t state = SPA_LOAD_OPEN; 4118 int error; 4119 int locked = B_FALSE; 4120 int firstopen = B_FALSE; 4121 4122 *spapp = NULL; 4123 4124 /* 4125 * As disgusting as this is, we need to support recursive calls to this 4126 * function because dsl_dir_open() is called during spa_load(), and ends 4127 * up calling spa_open() again. The real fix is to figure out how to 4128 * avoid dsl_dir_open() calling this in the first place. 4129 */ 4130 if (mutex_owner(&spa_namespace_lock) != curthread) { 4131 mutex_enter(&spa_namespace_lock); 4132 locked = B_TRUE; 4133 } 4134 4135 if ((spa = spa_lookup(pool)) == NULL) { 4136 if (locked) 4137 mutex_exit(&spa_namespace_lock); 4138 return (SET_ERROR(ENOENT)); 4139 } 4140 4141 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 4142 zpool_load_policy_t policy; 4143 4144 firstopen = B_TRUE; 4145 4146 zpool_get_load_policy(nvpolicy ? nvpolicy : spa->spa_config, 4147 &policy); 4148 if (policy.zlp_rewind & ZPOOL_DO_REWIND) 4149 state = SPA_LOAD_RECOVER; 4150 4151 spa_activate(spa, spa_mode_global); 4152 4153 if (state != SPA_LOAD_RECOVER) 4154 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4155 spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE; 4156 4157 zfs_dbgmsg("spa_open_common: opening %s", pool); 4158 error = spa_load_best(spa, state, policy.zlp_txg, 4159 policy.zlp_rewind); 4160 4161 if (error == EBADF) { 4162 /* 4163 * If vdev_validate() returns failure (indicated by 4164 * EBADF), it indicates that one of the vdevs indicates 4165 * that the pool has been exported or destroyed. If 4166 * this is the case, the config cache is out of sync and 4167 * we should remove the pool from the namespace. 4168 */ 4169 spa_unload(spa); 4170 spa_deactivate(spa); 4171 spa_write_cachefile(spa, B_TRUE, B_TRUE); 4172 spa_remove(spa); 4173 if (locked) 4174 mutex_exit(&spa_namespace_lock); 4175 return (SET_ERROR(ENOENT)); 4176 } 4177 4178 if (error) { 4179 /* 4180 * We can't open the pool, but we still have useful 4181 * information: the state of each vdev after the 4182 * attempted vdev_open(). Return this to the user. 4183 */ 4184 if (config != NULL && spa->spa_config) { 4185 VERIFY(nvlist_dup(spa->spa_config, config, 4186 KM_SLEEP) == 0); 4187 VERIFY(nvlist_add_nvlist(*config, 4188 ZPOOL_CONFIG_LOAD_INFO, 4189 spa->spa_load_info) == 0); 4190 } 4191 spa_unload(spa); 4192 spa_deactivate(spa); 4193 spa->spa_last_open_failed = error; 4194 if (locked) 4195 mutex_exit(&spa_namespace_lock); 4196 *spapp = NULL; 4197 return (error); 4198 } 4199 } 4200 4201 spa_open_ref(spa, tag); 4202 4203 if (config != NULL) 4204 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4205 4206 /* 4207 * If we've recovered the pool, pass back any information we 4208 * gathered while doing the load. 4209 */ 4210 if (state == SPA_LOAD_RECOVER) { 4211 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 4212 spa->spa_load_info) == 0); 4213 } 4214 4215 if (locked) { 4216 spa->spa_last_open_failed = 0; 4217 spa->spa_last_ubsync_txg = 0; 4218 spa->spa_load_txg = 0; 4219 mutex_exit(&spa_namespace_lock); 4220#ifdef __FreeBSD__ 4221#ifdef _KERNEL 4222 if (firstopen) 4223 zvol_create_minors(spa->spa_name); 4224#endif 4225#endif 4226 } 4227 4228 *spapp = spa; 4229 4230 return (0); 4231} 4232 4233int 4234spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 4235 nvlist_t **config) 4236{ 4237 return (spa_open_common(name, spapp, tag, policy, config)); 4238} 4239 4240int 4241spa_open(const char *name, spa_t **spapp, void *tag) 4242{ 4243 return (spa_open_common(name, spapp, tag, NULL, NULL)); 4244} 4245 4246/* 4247 * Lookup the given spa_t, incrementing the inject count in the process, 4248 * preventing it from being exported or destroyed. 4249 */ 4250spa_t * 4251spa_inject_addref(char *name) 4252{ 4253 spa_t *spa; 4254 4255 mutex_enter(&spa_namespace_lock); 4256 if ((spa = spa_lookup(name)) == NULL) { 4257 mutex_exit(&spa_namespace_lock); 4258 return (NULL); 4259 } 4260 spa->spa_inject_ref++; 4261 mutex_exit(&spa_namespace_lock); 4262 4263 return (spa); 4264} 4265 4266void 4267spa_inject_delref(spa_t *spa) 4268{ 4269 mutex_enter(&spa_namespace_lock); 4270 spa->spa_inject_ref--; 4271 mutex_exit(&spa_namespace_lock); 4272} 4273 4274/* 4275 * Add spares device information to the nvlist. 4276 */ 4277static void 4278spa_add_spares(spa_t *spa, nvlist_t *config) 4279{ 4280 nvlist_t **spares; 4281 uint_t i, nspares; 4282 nvlist_t *nvroot; 4283 uint64_t guid; 4284 vdev_stat_t *vs; 4285 uint_t vsc; 4286 uint64_t pool; 4287 4288 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 4289 4290 if (spa->spa_spares.sav_count == 0) 4291 return; 4292 4293 VERIFY(nvlist_lookup_nvlist(config, 4294 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 4295 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 4296 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 4297 if (nspares != 0) { 4298 VERIFY(nvlist_add_nvlist_array(nvroot, 4299 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4300 VERIFY(nvlist_lookup_nvlist_array(nvroot, 4301 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 4302 4303 /* 4304 * Go through and find any spares which have since been 4305 * repurposed as an active spare. If this is the case, update 4306 * their status appropriately. 4307 */ 4308 for (i = 0; i < nspares; i++) { 4309 VERIFY(nvlist_lookup_uint64(spares[i], 4310 ZPOOL_CONFIG_GUID, &guid) == 0); 4311 if (spa_spare_exists(guid, &pool, NULL) && 4312 pool != 0ULL) { 4313 VERIFY(nvlist_lookup_uint64_array( 4314 spares[i], ZPOOL_CONFIG_VDEV_STATS, 4315 (uint64_t **)&vs, &vsc) == 0); 4316 vs->vs_state = VDEV_STATE_CANT_OPEN; 4317 vs->vs_aux = VDEV_AUX_SPARED; 4318 } 4319 } 4320 } 4321} 4322 4323/* 4324 * Add l2cache device information to the nvlist, including vdev stats. 4325 */ 4326static void 4327spa_add_l2cache(spa_t *spa, nvlist_t *config) 4328{ 4329 nvlist_t **l2cache; 4330 uint_t i, j, nl2cache; 4331 nvlist_t *nvroot; 4332 uint64_t guid; 4333 vdev_t *vd; 4334 vdev_stat_t *vs; 4335 uint_t vsc; 4336 4337 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 4338 4339 if (spa->spa_l2cache.sav_count == 0) 4340 return; 4341 4342 VERIFY(nvlist_lookup_nvlist(config, 4343 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 4344 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 4345 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 4346 if (nl2cache != 0) { 4347 VERIFY(nvlist_add_nvlist_array(nvroot, 4348 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4349 VERIFY(nvlist_lookup_nvlist_array(nvroot, 4350 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 4351 4352 /* 4353 * Update level 2 cache device stats. 4354 */ 4355 4356 for (i = 0; i < nl2cache; i++) { 4357 VERIFY(nvlist_lookup_uint64(l2cache[i], 4358 ZPOOL_CONFIG_GUID, &guid) == 0); 4359 4360 vd = NULL; 4361 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 4362 if (guid == 4363 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 4364 vd = spa->spa_l2cache.sav_vdevs[j]; 4365 break; 4366 } 4367 } 4368 ASSERT(vd != NULL); 4369 4370 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 4371 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 4372 == 0); 4373 vdev_get_stats(vd, vs); 4374 } 4375 } 4376} 4377 4378static void 4379spa_add_feature_stats(spa_t *spa, nvlist_t *config) 4380{ 4381 nvlist_t *features; 4382 zap_cursor_t zc; 4383 zap_attribute_t za; 4384 4385 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 4386 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4387 4388 /* We may be unable to read features if pool is suspended. */ 4389 if (spa_suspended(spa)) 4390 goto out; 4391 4392 if (spa->spa_feat_for_read_obj != 0) { 4393 for (zap_cursor_init(&zc, spa->spa_meta_objset, 4394 spa->spa_feat_for_read_obj); 4395 zap_cursor_retrieve(&zc, &za) == 0; 4396 zap_cursor_advance(&zc)) { 4397 ASSERT(za.za_integer_length == sizeof (uint64_t) && 4398 za.za_num_integers == 1); 4399 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 4400 za.za_first_integer)); 4401 } 4402 zap_cursor_fini(&zc); 4403 } 4404 4405 if (spa->spa_feat_for_write_obj != 0) { 4406 for (zap_cursor_init(&zc, spa->spa_meta_objset, 4407 spa->spa_feat_for_write_obj); 4408 zap_cursor_retrieve(&zc, &za) == 0; 4409 zap_cursor_advance(&zc)) { 4410 ASSERT(za.za_integer_length == sizeof (uint64_t) && 4411 za.za_num_integers == 1); 4412 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 4413 za.za_first_integer)); 4414 } 4415 zap_cursor_fini(&zc); 4416 } 4417 4418out: 4419 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 4420 features) == 0); 4421 nvlist_free(features); 4422} 4423 4424int 4425spa_get_stats(const char *name, nvlist_t **config, 4426 char *altroot, size_t buflen) 4427{ 4428 int error; 4429 spa_t *spa; 4430 4431 *config = NULL; 4432 error = spa_open_common(name, &spa, FTAG, NULL, config); 4433 4434 if (spa != NULL) { 4435 /* 4436 * This still leaves a window of inconsistency where the spares 4437 * or l2cache devices could change and the config would be 4438 * self-inconsistent. 4439 */ 4440 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4441 4442 if (*config != NULL) { 4443 uint64_t loadtimes[2]; 4444 4445 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 4446 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 4447 VERIFY(nvlist_add_uint64_array(*config, 4448 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 4449 4450 VERIFY(nvlist_add_uint64(*config, 4451 ZPOOL_CONFIG_ERRCOUNT, 4452 spa_get_errlog_size(spa)) == 0); 4453 4454 if (spa_suspended(spa)) 4455 VERIFY(nvlist_add_uint64(*config, 4456 ZPOOL_CONFIG_SUSPENDED, 4457 spa->spa_failmode) == 0); 4458 4459 spa_add_spares(spa, *config); 4460 spa_add_l2cache(spa, *config); 4461 spa_add_feature_stats(spa, *config); 4462 } 4463 } 4464 4465 /* 4466 * We want to get the alternate root even for faulted pools, so we cheat 4467 * and call spa_lookup() directly. 4468 */ 4469 if (altroot) { 4470 if (spa == NULL) { 4471 mutex_enter(&spa_namespace_lock); 4472 spa = spa_lookup(name); 4473 if (spa) 4474 spa_altroot(spa, altroot, buflen); 4475 else 4476 altroot[0] = '\0'; 4477 spa = NULL; 4478 mutex_exit(&spa_namespace_lock); 4479 } else { 4480 spa_altroot(spa, altroot, buflen); 4481 } 4482 } 4483 4484 if (spa != NULL) { 4485 spa_config_exit(spa, SCL_CONFIG, FTAG); 4486 spa_close(spa, FTAG); 4487 } 4488 4489 return (error); 4490} 4491 4492/* 4493 * Validate that the auxiliary device array is well formed. We must have an 4494 * array of nvlists, each which describes a valid leaf vdev. If this is an 4495 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 4496 * specified, as long as they are well-formed. 4497 */ 4498static int 4499spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 4500 spa_aux_vdev_t *sav, const char *config, uint64_t version, 4501 vdev_labeltype_t label) 4502{ 4503 nvlist_t **dev; 4504 uint_t i, ndev; 4505 vdev_t *vd; 4506 int error; 4507 4508 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 4509 4510 /* 4511 * It's acceptable to have no devs specified. 4512 */ 4513 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 4514 return (0); 4515 4516 if (ndev == 0) 4517 return (SET_ERROR(EINVAL)); 4518 4519 /* 4520 * Make sure the pool is formatted with a version that supports this 4521 * device type. 4522 */ 4523 if (spa_version(spa) < version) 4524 return (SET_ERROR(ENOTSUP)); 4525 4526 /* 4527 * Set the pending device list so we correctly handle device in-use 4528 * checking. 4529 */ 4530 sav->sav_pending = dev; 4531 sav->sav_npending = ndev; 4532 4533 for (i = 0; i < ndev; i++) { 4534 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 4535 mode)) != 0) 4536 goto out; 4537 4538 if (!vd->vdev_ops->vdev_op_leaf) { 4539 vdev_free(vd); 4540 error = SET_ERROR(EINVAL); 4541 goto out; 4542 } 4543 4544 /* 4545 * The L2ARC currently only supports disk devices in 4546 * kernel context. For user-level testing, we allow it. 4547 */ 4548#ifdef _KERNEL 4549 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 4550 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 4551 error = SET_ERROR(ENOTBLK); 4552 vdev_free(vd); 4553 goto out; 4554 } 4555#endif 4556 vd->vdev_top = vd; 4557 4558 if ((error = vdev_open(vd)) == 0 && 4559 (error = vdev_label_init(vd, crtxg, label)) == 0) { 4560 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 4561 vd->vdev_guid) == 0); 4562 } 4563 4564 vdev_free(vd); 4565 4566 if (error && 4567 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 4568 goto out; 4569 else 4570 error = 0; 4571 } 4572 4573out: 4574 sav->sav_pending = NULL; 4575 sav->sav_npending = 0; 4576 return (error); 4577} 4578 4579static int 4580spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 4581{ 4582 int error; 4583 4584 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 4585 4586 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 4587 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 4588 VDEV_LABEL_SPARE)) != 0) { 4589 return (error); 4590 } 4591 4592 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 4593 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 4594 VDEV_LABEL_L2CACHE)); 4595} 4596 4597static void 4598spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 4599 const char *config) 4600{ 4601 int i; 4602 4603 if (sav->sav_config != NULL) { 4604 nvlist_t **olddevs; 4605 uint_t oldndevs; 4606 nvlist_t **newdevs; 4607 4608 /* 4609 * Generate new dev list by concatentating with the 4610 * current dev list. 4611 */ 4612 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 4613 &olddevs, &oldndevs) == 0); 4614 4615 newdevs = kmem_alloc(sizeof (void *) * 4616 (ndevs + oldndevs), KM_SLEEP); 4617 for (i = 0; i < oldndevs; i++) 4618 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 4619 KM_SLEEP) == 0); 4620 for (i = 0; i < ndevs; i++) 4621 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 4622 KM_SLEEP) == 0); 4623 4624 VERIFY(nvlist_remove(sav->sav_config, config, 4625 DATA_TYPE_NVLIST_ARRAY) == 0); 4626 4627 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 4628 config, newdevs, ndevs + oldndevs) == 0); 4629 for (i = 0; i < oldndevs + ndevs; i++) 4630 nvlist_free(newdevs[i]); 4631 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 4632 } else { 4633 /* 4634 * Generate a new dev list. 4635 */ 4636 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 4637 KM_SLEEP) == 0); 4638 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 4639 devs, ndevs) == 0); 4640 } 4641} 4642 4643/* 4644 * Stop and drop level 2 ARC devices 4645 */ 4646void 4647spa_l2cache_drop(spa_t *spa) 4648{ 4649 vdev_t *vd; 4650 int i; 4651 spa_aux_vdev_t *sav = &spa->spa_l2cache; 4652 4653 for (i = 0; i < sav->sav_count; i++) { 4654 uint64_t pool; 4655 4656 vd = sav->sav_vdevs[i]; 4657 ASSERT(vd != NULL); 4658 4659 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 4660 pool != 0ULL && l2arc_vdev_present(vd)) 4661 l2arc_remove_vdev(vd); 4662 } 4663} 4664 4665/* 4666 * Pool Creation 4667 */ 4668int 4669spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 4670 nvlist_t *zplprops) 4671{ 4672 spa_t *spa; 4673 char *altroot = NULL; 4674 vdev_t *rvd; 4675 dsl_pool_t *dp; 4676 dmu_tx_t *tx; 4677 int error = 0; 4678 uint64_t txg = TXG_INITIAL; 4679 nvlist_t **spares, **l2cache; 4680 uint_t nspares, nl2cache; 4681 uint64_t version, obj; 4682 boolean_t has_features; 4683 char *poolname; 4684 nvlist_t *nvl; 4685 4686 if (nvlist_lookup_string(props, 4687 zpool_prop_to_name(ZPOOL_PROP_TNAME), &poolname) != 0) 4688 poolname = (char *)pool; 4689 4690 /* 4691 * If this pool already exists, return failure. 4692 */ 4693 mutex_enter(&spa_namespace_lock); 4694 if (spa_lookup(poolname) != NULL) { 4695 mutex_exit(&spa_namespace_lock); 4696 return (SET_ERROR(EEXIST)); 4697 } 4698 4699 /* 4700 * Allocate a new spa_t structure. 4701 */ 4702 nvl = fnvlist_alloc(); 4703 fnvlist_add_string(nvl, ZPOOL_CONFIG_POOL_NAME, pool); 4704 (void) nvlist_lookup_string(props, 4705 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4706 spa = spa_add(poolname, nvl, altroot); 4707 fnvlist_free(nvl); 4708 spa_activate(spa, spa_mode_global); 4709 4710 if (props && (error = spa_prop_validate(spa, props))) { 4711 spa_deactivate(spa); 4712 spa_remove(spa); 4713 mutex_exit(&spa_namespace_lock); 4714 return (error); 4715 } 4716 4717 /* 4718 * Temporary pool names should never be written to disk. 4719 */ 4720 if (poolname != pool) 4721 spa->spa_import_flags |= ZFS_IMPORT_TEMP_NAME; 4722 4723 has_features = B_FALSE; 4724 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 4725 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 4726 if (zpool_prop_feature(nvpair_name(elem))) 4727 has_features = B_TRUE; 4728 } 4729 4730 if (has_features || nvlist_lookup_uint64(props, 4731 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 4732 version = SPA_VERSION; 4733 } 4734 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 4735 4736 spa->spa_first_txg = txg; 4737 spa->spa_uberblock.ub_txg = txg - 1; 4738 spa->spa_uberblock.ub_version = version; 4739 spa->spa_ubsync = spa->spa_uberblock; 4740 spa->spa_load_state = SPA_LOAD_CREATE; 4741 spa->spa_removing_phys.sr_state = DSS_NONE; 4742 spa->spa_removing_phys.sr_removing_vdev = -1; 4743 spa->spa_removing_phys.sr_prev_indirect_vdev = -1; 4744 spa->spa_indirect_vdevs_loaded = B_TRUE; 4745 4746 /* 4747 * Create "The Godfather" zio to hold all async IOs 4748 */ 4749 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 4750 KM_SLEEP); 4751 for (int i = 0; i < max_ncpus; i++) { 4752 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 4753 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 4754 ZIO_FLAG_GODFATHER); 4755 } 4756 4757 /* 4758 * Create the root vdev. 4759 */ 4760 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4761 4762 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 4763 4764 ASSERT(error != 0 || rvd != NULL); 4765 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 4766 4767 if (error == 0 && !zfs_allocatable_devs(nvroot)) 4768 error = SET_ERROR(EINVAL); 4769 4770 if (error == 0 && 4771 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 4772 (error = spa_validate_aux(spa, nvroot, txg, 4773 VDEV_ALLOC_ADD)) == 0) { 4774 for (int c = 0; c < rvd->vdev_children; c++) { 4775 vdev_ashift_optimize(rvd->vdev_child[c]); 4776 vdev_metaslab_set_size(rvd->vdev_child[c]); 4777 vdev_expand(rvd->vdev_child[c], txg); 4778 } 4779 } 4780 4781 spa_config_exit(spa, SCL_ALL, FTAG); 4782 4783 if (error != 0) { 4784 spa_unload(spa); 4785 spa_deactivate(spa); 4786 spa_remove(spa); 4787 mutex_exit(&spa_namespace_lock); 4788 return (error); 4789 } 4790 4791 /* 4792 * Get the list of spares, if specified. 4793 */ 4794 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4795 &spares, &nspares) == 0) { 4796 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 4797 KM_SLEEP) == 0); 4798 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4799 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4800 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4801 spa_load_spares(spa); 4802 spa_config_exit(spa, SCL_ALL, FTAG); 4803 spa->spa_spares.sav_sync = B_TRUE; 4804 } 4805 4806 /* 4807 * Get the list of level 2 cache devices, if specified. 4808 */ 4809 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4810 &l2cache, &nl2cache) == 0) { 4811 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4812 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4813 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4814 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4815 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4816 spa_load_l2cache(spa); 4817 spa_config_exit(spa, SCL_ALL, FTAG); 4818 spa->spa_l2cache.sav_sync = B_TRUE; 4819 } 4820 4821 spa->spa_is_initializing = B_TRUE; 4822 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 4823 spa->spa_meta_objset = dp->dp_meta_objset; 4824 spa->spa_is_initializing = B_FALSE; 4825 4826 /* 4827 * Create DDTs (dedup tables). 4828 */ 4829 ddt_create(spa); 4830 4831 spa_update_dspace(spa); 4832 4833 tx = dmu_tx_create_assigned(dp, txg); 4834 4835 /* 4836 * Create the pool config object. 4837 */ 4838 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 4839 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 4840 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 4841 4842 if (zap_add(spa->spa_meta_objset, 4843 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 4844 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 4845 cmn_err(CE_PANIC, "failed to add pool config"); 4846 } 4847 4848 if (spa_version(spa) >= SPA_VERSION_FEATURES) 4849 spa_feature_create_zap_objects(spa, tx); 4850 4851 if (zap_add(spa->spa_meta_objset, 4852 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 4853 sizeof (uint64_t), 1, &version, tx) != 0) { 4854 cmn_err(CE_PANIC, "failed to add pool version"); 4855 } 4856 4857 /* Newly created pools with the right version are always deflated. */ 4858 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 4859 spa->spa_deflate = TRUE; 4860 if (zap_add(spa->spa_meta_objset, 4861 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 4862 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 4863 cmn_err(CE_PANIC, "failed to add deflate"); 4864 } 4865 } 4866 4867 /* 4868 * Create the deferred-free bpobj. Turn off compression 4869 * because sync-to-convergence takes longer if the blocksize 4870 * keeps changing. 4871 */ 4872 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 4873 dmu_object_set_compress(spa->spa_meta_objset, obj, 4874 ZIO_COMPRESS_OFF, tx); 4875 if (zap_add(spa->spa_meta_objset, 4876 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 4877 sizeof (uint64_t), 1, &obj, tx) != 0) { 4878 cmn_err(CE_PANIC, "failed to add bpobj"); 4879 } 4880 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 4881 spa->spa_meta_objset, obj)); 4882 4883 /* 4884 * Create the pool's history object. 4885 */ 4886 if (version >= SPA_VERSION_ZPOOL_HISTORY) 4887 spa_history_create_obj(spa, tx); 4888 4889 /* 4890 * Generate some random noise for salted checksums to operate on. 4891 */ 4892 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 4893 sizeof (spa->spa_cksum_salt.zcs_bytes)); 4894 4895 /* 4896 * Set pool properties. 4897 */ 4898 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 4899 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 4900 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 4901 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 4902 4903 if (props != NULL) { 4904 spa_configfile_set(spa, props, B_FALSE); 4905 spa_sync_props(props, tx); 4906 } 4907 4908 dmu_tx_commit(tx); 4909 4910 spa->spa_sync_on = B_TRUE; 4911 txg_sync_start(spa->spa_dsl_pool); 4912 4913 /* 4914 * We explicitly wait for the first transaction to complete so that our 4915 * bean counters are appropriately updated. 4916 */ 4917 txg_wait_synced(spa->spa_dsl_pool, txg); 4918 4919 spa_spawn_aux_threads(spa); 4920 4921 spa_write_cachefile(spa, B_FALSE, B_TRUE); 4922 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_CREATE); 4923 4924 spa_history_log_version(spa, "create"); 4925 4926 /* 4927 * Don't count references from objsets that are already closed 4928 * and are making their way through the eviction process. 4929 */ 4930 spa_evicting_os_wait(spa); 4931 spa->spa_minref = refcount_count(&spa->spa_refcount); 4932 spa->spa_load_state = SPA_LOAD_NONE; 4933 4934 mutex_exit(&spa_namespace_lock); 4935 4936 return (0); 4937} 4938 4939#ifdef _KERNEL 4940#ifdef illumos 4941/* 4942 * Get the root pool information from the root disk, then import the root pool 4943 * during the system boot up time. 4944 */ 4945extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 4946 4947static nvlist_t * 4948spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 4949{ 4950 nvlist_t *config; 4951 nvlist_t *nvtop, *nvroot; 4952 uint64_t pgid; 4953 4954 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 4955 return (NULL); 4956 4957 /* 4958 * Add this top-level vdev to the child array. 4959 */ 4960 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4961 &nvtop) == 0); 4962 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 4963 &pgid) == 0); 4964 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 4965 4966 /* 4967 * Put this pool's top-level vdevs into a root vdev. 4968 */ 4969 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4970 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 4971 VDEV_TYPE_ROOT) == 0); 4972 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 4973 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 4974 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 4975 &nvtop, 1) == 0); 4976 4977 /* 4978 * Replace the existing vdev_tree with the new root vdev in 4979 * this pool's configuration (remove the old, add the new). 4980 */ 4981 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 4982 nvlist_free(nvroot); 4983 return (config); 4984} 4985 4986/* 4987 * Walk the vdev tree and see if we can find a device with "better" 4988 * configuration. A configuration is "better" if the label on that 4989 * device has a more recent txg. 4990 */ 4991static void 4992spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 4993{ 4994 for (int c = 0; c < vd->vdev_children; c++) 4995 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 4996 4997 if (vd->vdev_ops->vdev_op_leaf) { 4998 nvlist_t *label; 4999 uint64_t label_txg; 5000 5001 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 5002 &label) != 0) 5003 return; 5004 5005 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 5006 &label_txg) == 0); 5007 5008 /* 5009 * Do we have a better boot device? 5010 */ 5011 if (label_txg > *txg) { 5012 *txg = label_txg; 5013 *avd = vd; 5014 } 5015 nvlist_free(label); 5016 } 5017} 5018 5019/* 5020 * Import a root pool. 5021 * 5022 * For x86. devpath_list will consist of devid and/or physpath name of 5023 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 5024 * The GRUB "findroot" command will return the vdev we should boot. 5025 * 5026 * For Sparc, devpath_list consists the physpath name of the booting device 5027 * no matter the rootpool is a single device pool or a mirrored pool. 5028 * e.g. 5029 * "/pci@1f,0/ide@d/disk@0,0:a" 5030 */ 5031int 5032spa_import_rootpool(char *devpath, char *devid) 5033{ 5034 spa_t *spa; 5035 vdev_t *rvd, *bvd, *avd = NULL; 5036 nvlist_t *config, *nvtop; 5037 uint64_t guid, txg; 5038 char *pname; 5039 int error; 5040 5041 /* 5042 * Read the label from the boot device and generate a configuration. 5043 */ 5044 config = spa_generate_rootconf(devpath, devid, &guid); 5045#if defined(_OBP) && defined(_KERNEL) 5046 if (config == NULL) { 5047 if (strstr(devpath, "/iscsi/ssd") != NULL) { 5048 /* iscsi boot */ 5049 get_iscsi_bootpath_phy(devpath); 5050 config = spa_generate_rootconf(devpath, devid, &guid); 5051 } 5052 } 5053#endif 5054 if (config == NULL) { 5055 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 5056 devpath); 5057 return (SET_ERROR(EIO)); 5058 } 5059 5060 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 5061 &pname) == 0); 5062 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 5063 5064 mutex_enter(&spa_namespace_lock); 5065 if ((spa = spa_lookup(pname)) != NULL) { 5066 /* 5067 * Remove the existing root pool from the namespace so that we 5068 * can replace it with the correct config we just read in. 5069 */ 5070 spa_remove(spa); 5071 } 5072 5073 spa = spa_add(pname, config, NULL); 5074 spa->spa_is_root = B_TRUE; 5075 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 5076 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 5077 &spa->spa_ubsync.ub_version) != 0) 5078 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 5079 5080 /* 5081 * Build up a vdev tree based on the boot device's label config. 5082 */ 5083 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 5084 &nvtop) == 0); 5085 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5086 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 5087 VDEV_ALLOC_ROOTPOOL); 5088 spa_config_exit(spa, SCL_ALL, FTAG); 5089 if (error) { 5090 mutex_exit(&spa_namespace_lock); 5091 nvlist_free(config); 5092 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 5093 pname); 5094 return (error); 5095 } 5096 5097 /* 5098 * Get the boot vdev. 5099 */ 5100 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 5101 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 5102 (u_longlong_t)guid); 5103 error = SET_ERROR(ENOENT); 5104 goto out; 5105 } 5106 5107 /* 5108 * Determine if there is a better boot device. 5109 */ 5110 avd = bvd; 5111 spa_alt_rootvdev(rvd, &avd, &txg); 5112 if (avd != bvd) { 5113 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 5114 "try booting from '%s'", avd->vdev_path); 5115 error = SET_ERROR(EINVAL); 5116 goto out; 5117 } 5118 5119 /* 5120 * If the boot device is part of a spare vdev then ensure that 5121 * we're booting off the active spare. 5122 */ 5123 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 5124 !bvd->vdev_isspare) { 5125 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 5126 "try booting from '%s'", 5127 bvd->vdev_parent-> 5128 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 5129 error = SET_ERROR(EINVAL); 5130 goto out; 5131 } 5132 5133 error = 0; 5134out: 5135 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5136 vdev_free(rvd); 5137 spa_config_exit(spa, SCL_ALL, FTAG); 5138 mutex_exit(&spa_namespace_lock); 5139 5140 nvlist_free(config); 5141 return (error); 5142} 5143 5144#else /* !illumos */ 5145 5146extern int vdev_geom_read_pool_label(const char *name, nvlist_t ***configs, 5147 uint64_t *count); 5148 5149static nvlist_t * 5150spa_generate_rootconf(const char *name) 5151{ 5152 nvlist_t **configs, **tops; 5153 nvlist_t *config; 5154 nvlist_t *best_cfg, *nvtop, *nvroot; 5155 uint64_t *holes; 5156 uint64_t best_txg; 5157 uint64_t nchildren; 5158 uint64_t pgid; 5159 uint64_t count; 5160 uint64_t i; 5161 uint_t nholes; 5162 5163 if (vdev_geom_read_pool_label(name, &configs, &count) != 0) 5164 return (NULL); 5165 5166 ASSERT3U(count, !=, 0); 5167 best_txg = 0; 5168 for (i = 0; i < count; i++) { 5169 uint64_t txg; 5170 5171 VERIFY(nvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG, 5172 &txg) == 0); 5173 if (txg > best_txg) { 5174 best_txg = txg; 5175 best_cfg = configs[i]; 5176 } 5177 } 5178 5179 nchildren = 1; 5180 nvlist_lookup_uint64(best_cfg, ZPOOL_CONFIG_VDEV_CHILDREN, &nchildren); 5181 holes = NULL; 5182 nvlist_lookup_uint64_array(best_cfg, ZPOOL_CONFIG_HOLE_ARRAY, 5183 &holes, &nholes); 5184 5185 tops = kmem_zalloc(nchildren * sizeof(void *), KM_SLEEP); 5186 for (i = 0; i < nchildren; i++) { 5187 if (i >= count) 5188 break; 5189 if (configs[i] == NULL) 5190 continue; 5191 VERIFY(nvlist_lookup_nvlist(configs[i], ZPOOL_CONFIG_VDEV_TREE, 5192 &nvtop) == 0); 5193 nvlist_dup(nvtop, &tops[i], KM_SLEEP); 5194 } 5195 for (i = 0; holes != NULL && i < nholes; i++) { 5196 if (i >= nchildren) 5197 continue; 5198 if (tops[holes[i]] != NULL) 5199 continue; 5200 nvlist_alloc(&tops[holes[i]], NV_UNIQUE_NAME, KM_SLEEP); 5201 VERIFY(nvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE, 5202 VDEV_TYPE_HOLE) == 0); 5203 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID, 5204 holes[i]) == 0); 5205 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID, 5206 0) == 0); 5207 } 5208 for (i = 0; i < nchildren; i++) { 5209 if (tops[i] != NULL) 5210 continue; 5211 nvlist_alloc(&tops[i], NV_UNIQUE_NAME, KM_SLEEP); 5212 VERIFY(nvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE, 5213 VDEV_TYPE_MISSING) == 0); 5214 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID, 5215 i) == 0); 5216 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID, 5217 0) == 0); 5218 } 5219 5220 /* 5221 * Create pool config based on the best vdev config. 5222 */ 5223 nvlist_dup(best_cfg, &config, KM_SLEEP); 5224 5225 /* 5226 * Put this pool's top-level vdevs into a root vdev. 5227 */ 5228 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 5229 &pgid) == 0); 5230 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5231 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 5232 VDEV_TYPE_ROOT) == 0); 5233 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 5234 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 5235 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 5236 tops, nchildren) == 0); 5237 5238 /* 5239 * Replace the existing vdev_tree with the new root vdev in 5240 * this pool's configuration (remove the old, add the new). 5241 */ 5242 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 5243 5244 /* 5245 * Drop vdev config elements that should not be present at pool level. 5246 */ 5247 nvlist_remove(config, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64); 5248 nvlist_remove(config, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64); 5249 5250 for (i = 0; i < count; i++) 5251 nvlist_free(configs[i]); 5252 kmem_free(configs, count * sizeof(void *)); 5253 for (i = 0; i < nchildren; i++) 5254 nvlist_free(tops[i]); 5255 kmem_free(tops, nchildren * sizeof(void *)); 5256 nvlist_free(nvroot); 5257 return (config); 5258} 5259 5260int 5261spa_import_rootpool(const char *name) 5262{ 5263 spa_t *spa; 5264 vdev_t *rvd, *bvd, *avd = NULL; 5265 nvlist_t *config, *nvtop; 5266 uint64_t txg; 5267 char *pname; 5268 int error; 5269 5270 /* 5271 * Read the label from the boot device and generate a configuration. 5272 */ 5273 config = spa_generate_rootconf(name); 5274 5275 mutex_enter(&spa_namespace_lock); 5276 if (config != NULL) { 5277 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 5278 &pname) == 0 && strcmp(name, pname) == 0); 5279 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) 5280 == 0); 5281 5282 if ((spa = spa_lookup(pname)) != NULL) { 5283 /* 5284 * The pool could already be imported, 5285 * e.g., after reboot -r. 5286 */ 5287 if (spa->spa_state == POOL_STATE_ACTIVE) { 5288 mutex_exit(&spa_namespace_lock); 5289 nvlist_free(config); 5290 return (0); 5291 } 5292 5293 /* 5294 * Remove the existing root pool from the namespace so 5295 * that we can replace it with the correct config 5296 * we just read in. 5297 */ 5298 spa_remove(spa); 5299 } 5300 spa = spa_add(pname, config, NULL); 5301 5302 /* 5303 * Set spa_ubsync.ub_version as it can be used in vdev_alloc() 5304 * via spa_version(). 5305 */ 5306 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 5307 &spa->spa_ubsync.ub_version) != 0) 5308 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 5309 } else if ((spa = spa_lookup(name)) == NULL) { 5310 mutex_exit(&spa_namespace_lock); 5311 nvlist_free(config); 5312 cmn_err(CE_NOTE, "Cannot find the pool label for '%s'", 5313 name); 5314 return (EIO); 5315 } else { 5316 VERIFY(nvlist_dup(spa->spa_config, &config, KM_SLEEP) == 0); 5317 } 5318 spa->spa_is_root = B_TRUE; 5319 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 5320 5321 /* 5322 * Build up a vdev tree based on the boot device's label config. 5323 */ 5324 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 5325 &nvtop) == 0); 5326 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5327 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 5328 VDEV_ALLOC_ROOTPOOL); 5329 spa_config_exit(spa, SCL_ALL, FTAG); 5330 if (error) { 5331 mutex_exit(&spa_namespace_lock); 5332 nvlist_free(config); 5333 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 5334 pname); 5335 return (error); 5336 } 5337 5338 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5339 vdev_free(rvd); 5340 spa_config_exit(spa, SCL_ALL, FTAG); 5341 mutex_exit(&spa_namespace_lock); 5342 5343 nvlist_free(config); 5344 return (0); 5345} 5346 5347#endif /* illumos */ 5348#endif /* _KERNEL */ 5349 5350/* 5351 * Import a non-root pool into the system. 5352 */ 5353int 5354spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 5355{ 5356 spa_t *spa; 5357 char *altroot = NULL; 5358 spa_load_state_t state = SPA_LOAD_IMPORT; 5359 zpool_load_policy_t policy; 5360 uint64_t mode = spa_mode_global; 5361 uint64_t readonly = B_FALSE; 5362 int error; 5363 nvlist_t *nvroot; 5364 nvlist_t **spares, **l2cache; 5365 uint_t nspares, nl2cache; 5366 5367 /* 5368 * If a pool with this name exists, return failure. 5369 */ 5370 mutex_enter(&spa_namespace_lock); 5371 if (spa_lookup(pool) != NULL) { 5372 mutex_exit(&spa_namespace_lock); 5373 return (SET_ERROR(EEXIST)); 5374 } 5375 5376 /* 5377 * Create and initialize the spa structure. 5378 */ 5379 (void) nvlist_lookup_string(props, 5380 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5381 (void) nvlist_lookup_uint64(props, 5382 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 5383 if (readonly) 5384 mode = FREAD; 5385 spa = spa_add(pool, config, altroot); 5386 spa->spa_import_flags = flags; 5387 5388 /* 5389 * Verbatim import - Take a pool and insert it into the namespace 5390 * as if it had been loaded at boot. 5391 */ 5392 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 5393 if (props != NULL) 5394 spa_configfile_set(spa, props, B_FALSE); 5395 5396 spa_write_cachefile(spa, B_FALSE, B_TRUE); 5397 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT); 5398 zfs_dbgmsg("spa_import: verbatim import of %s", pool); 5399 mutex_exit(&spa_namespace_lock); 5400 return (0); 5401 } 5402 5403 spa_activate(spa, mode); 5404 5405 /* 5406 * Don't start async tasks until we know everything is healthy. 5407 */ 5408 spa_async_suspend(spa); 5409 5410 zpool_get_load_policy(config, &policy); 5411 if (policy.zlp_rewind & ZPOOL_DO_REWIND) 5412 state = SPA_LOAD_RECOVER; 5413 5414 spa->spa_config_source = SPA_CONFIG_SRC_TRYIMPORT; 5415 5416 if (state != SPA_LOAD_RECOVER) { 5417 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 5418 zfs_dbgmsg("spa_import: importing %s", pool); 5419 } else { 5420 zfs_dbgmsg("spa_import: importing %s, max_txg=%lld " 5421 "(RECOVERY MODE)", pool, (longlong_t)policy.zlp_txg); 5422 } 5423 error = spa_load_best(spa, state, policy.zlp_txg, policy.zlp_rewind); 5424 5425 /* 5426 * Propagate anything learned while loading the pool and pass it 5427 * back to caller (i.e. rewind info, missing devices, etc). 5428 */ 5429 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 5430 spa->spa_load_info) == 0); 5431 5432 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5433 /* 5434 * Toss any existing sparelist, as it doesn't have any validity 5435 * anymore, and conflicts with spa_has_spare(). 5436 */ 5437 if (spa->spa_spares.sav_config) { 5438 nvlist_free(spa->spa_spares.sav_config); 5439 spa->spa_spares.sav_config = NULL; 5440 spa_load_spares(spa); 5441 } 5442 if (spa->spa_l2cache.sav_config) { 5443 nvlist_free(spa->spa_l2cache.sav_config); 5444 spa->spa_l2cache.sav_config = NULL; 5445 spa_load_l2cache(spa); 5446 } 5447 5448 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 5449 &nvroot) == 0); 5450 if (error == 0) 5451 error = spa_validate_aux(spa, nvroot, -1ULL, 5452 VDEV_ALLOC_SPARE); 5453 if (error == 0) 5454 error = spa_validate_aux(spa, nvroot, -1ULL, 5455 VDEV_ALLOC_L2CACHE); 5456 spa_config_exit(spa, SCL_ALL, FTAG); 5457 5458 if (props != NULL) 5459 spa_configfile_set(spa, props, B_FALSE); 5460 5461 if (error != 0 || (props && spa_writeable(spa) && 5462 (error = spa_prop_set(spa, props)))) { 5463 spa_unload(spa); 5464 spa_deactivate(spa); 5465 spa_remove(spa); 5466 mutex_exit(&spa_namespace_lock); 5467 return (error); 5468 } 5469 5470 spa_async_resume(spa); 5471 5472 /* 5473 * Override any spares and level 2 cache devices as specified by 5474 * the user, as these may have correct device names/devids, etc. 5475 */ 5476 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 5477 &spares, &nspares) == 0) { 5478 if (spa->spa_spares.sav_config) 5479 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 5480 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 5481 else 5482 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 5483 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5484 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 5485 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 5486 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5487 spa_load_spares(spa); 5488 spa_config_exit(spa, SCL_ALL, FTAG); 5489 spa->spa_spares.sav_sync = B_TRUE; 5490 } 5491 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 5492 &l2cache, &nl2cache) == 0) { 5493 if (spa->spa_l2cache.sav_config) 5494 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 5495 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 5496 else 5497 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 5498 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5499 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 5500 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 5501 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5502 spa_load_l2cache(spa); 5503 spa_config_exit(spa, SCL_ALL, FTAG); 5504 spa->spa_l2cache.sav_sync = B_TRUE; 5505 } 5506 5507 /* 5508 * Check for any removed devices. 5509 */ 5510 if (spa->spa_autoreplace) { 5511 spa_aux_check_removed(&spa->spa_spares); 5512 spa_aux_check_removed(&spa->spa_l2cache); 5513 } 5514 5515 if (spa_writeable(spa)) { 5516 /* 5517 * Update the config cache to include the newly-imported pool. 5518 */ 5519 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 5520 } 5521 5522 /* 5523 * It's possible that the pool was expanded while it was exported. 5524 * We kick off an async task to handle this for us. 5525 */ 5526 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 5527 5528 spa_history_log_version(spa, "import"); 5529 5530 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT); 5531 5532 mutex_exit(&spa_namespace_lock); 5533 5534#ifdef __FreeBSD__ 5535#ifdef _KERNEL 5536 zvol_create_minors(pool); 5537#endif 5538#endif 5539 return (0); 5540} 5541 5542nvlist_t * 5543spa_tryimport(nvlist_t *tryconfig) 5544{ 5545 nvlist_t *config = NULL; 5546 char *poolname, *cachefile; 5547 spa_t *spa; 5548 uint64_t state; 5549 int error; 5550 zpool_load_policy_t policy; 5551 5552 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 5553 return (NULL); 5554 5555 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 5556 return (NULL); 5557 5558 /* 5559 * Create and initialize the spa structure. 5560 */ 5561 mutex_enter(&spa_namespace_lock); 5562 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 5563 spa_activate(spa, FREAD); 5564 5565 /* 5566 * Rewind pool if a max txg was provided. 5567 */ 5568 zpool_get_load_policy(spa->spa_config, &policy); 5569 if (policy.zlp_txg != UINT64_MAX) { 5570 spa->spa_load_max_txg = policy.zlp_txg; 5571 spa->spa_extreme_rewind = B_TRUE; 5572 zfs_dbgmsg("spa_tryimport: importing %s, max_txg=%lld", 5573 poolname, (longlong_t)policy.zlp_txg); 5574 } else { 5575 zfs_dbgmsg("spa_tryimport: importing %s", poolname); 5576 } 5577 5578 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_CACHEFILE, &cachefile) 5579 == 0) { 5580 zfs_dbgmsg("spa_tryimport: using cachefile '%s'", cachefile); 5581 spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE; 5582 } else { 5583 spa->spa_config_source = SPA_CONFIG_SRC_SCAN; 5584 } 5585 5586 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING); 5587 5588 /* 5589 * If 'tryconfig' was at least parsable, return the current config. 5590 */ 5591 if (spa->spa_root_vdev != NULL) { 5592 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 5593 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 5594 poolname) == 0); 5595 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5596 state) == 0); 5597 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 5598 spa->spa_uberblock.ub_timestamp) == 0); 5599 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 5600 spa->spa_load_info) == 0); 5601 5602 /* 5603 * If the bootfs property exists on this pool then we 5604 * copy it out so that external consumers can tell which 5605 * pools are bootable. 5606 */ 5607 if ((!error || error == EEXIST) && spa->spa_bootfs) { 5608 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 5609 5610 /* 5611 * We have to play games with the name since the 5612 * pool was opened as TRYIMPORT_NAME. 5613 */ 5614 if (dsl_dsobj_to_dsname(spa_name(spa), 5615 spa->spa_bootfs, tmpname) == 0) { 5616 char *cp; 5617 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 5618 5619 cp = strchr(tmpname, '/'); 5620 if (cp == NULL) { 5621 (void) strlcpy(dsname, tmpname, 5622 MAXPATHLEN); 5623 } else { 5624 (void) snprintf(dsname, MAXPATHLEN, 5625 "%s/%s", poolname, ++cp); 5626 } 5627 VERIFY(nvlist_add_string(config, 5628 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 5629 kmem_free(dsname, MAXPATHLEN); 5630 } 5631 kmem_free(tmpname, MAXPATHLEN); 5632 } 5633 5634 /* 5635 * Add the list of hot spares and level 2 cache devices. 5636 */ 5637 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 5638 spa_add_spares(spa, config); 5639 spa_add_l2cache(spa, config); 5640 spa_config_exit(spa, SCL_CONFIG, FTAG); 5641 } 5642 5643 spa_unload(spa); 5644 spa_deactivate(spa); 5645 spa_remove(spa); 5646 mutex_exit(&spa_namespace_lock); 5647 5648 return (config); 5649} 5650 5651/* 5652 * Pool export/destroy 5653 * 5654 * The act of destroying or exporting a pool is very simple. We make sure there 5655 * is no more pending I/O and any references to the pool are gone. Then, we 5656 * update the pool state and sync all the labels to disk, removing the 5657 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 5658 * we don't sync the labels or remove the configuration cache. 5659 */ 5660static int 5661spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 5662 boolean_t force, boolean_t hardforce) 5663{ 5664 spa_t *spa; 5665 5666 if (oldconfig) 5667 *oldconfig = NULL; 5668 5669 if (!(spa_mode_global & FWRITE)) 5670 return (SET_ERROR(EROFS)); 5671 5672 mutex_enter(&spa_namespace_lock); 5673 if ((spa = spa_lookup(pool)) == NULL) { 5674 mutex_exit(&spa_namespace_lock); 5675 return (SET_ERROR(ENOENT)); 5676 } 5677 5678 /* 5679 * Put a hold on the pool, drop the namespace lock, stop async tasks, 5680 * reacquire the namespace lock, and see if we can export. 5681 */ 5682 spa_open_ref(spa, FTAG); 5683 mutex_exit(&spa_namespace_lock); 5684 spa_async_suspend(spa); 5685 mutex_enter(&spa_namespace_lock); 5686 spa_close(spa, FTAG); 5687 5688 /* 5689 * The pool will be in core if it's openable, 5690 * in which case we can modify its state. 5691 */ 5692 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 5693 5694 /* 5695 * Objsets may be open only because they're dirty, so we 5696 * have to force it to sync before checking spa_refcnt. 5697 */ 5698 txg_wait_synced(spa->spa_dsl_pool, 0); 5699 spa_evicting_os_wait(spa); 5700 5701 /* 5702 * A pool cannot be exported or destroyed if there are active 5703 * references. If we are resetting a pool, allow references by 5704 * fault injection handlers. 5705 */ 5706 if (!spa_refcount_zero(spa) || 5707 (spa->spa_inject_ref != 0 && 5708 new_state != POOL_STATE_UNINITIALIZED)) { 5709 spa_async_resume(spa); 5710 mutex_exit(&spa_namespace_lock); 5711 return (SET_ERROR(EBUSY)); 5712 } 5713 5714 /* 5715 * A pool cannot be exported if it has an active shared spare. 5716 * This is to prevent other pools stealing the active spare 5717 * from an exported pool. At user's own will, such pool can 5718 * be forcedly exported. 5719 */ 5720 if (!force && new_state == POOL_STATE_EXPORTED && 5721 spa_has_active_shared_spare(spa)) { 5722 spa_async_resume(spa); 5723 mutex_exit(&spa_namespace_lock); 5724 return (SET_ERROR(EXDEV)); 5725 } 5726 5727 /* 5728 * We're about to export or destroy this pool. Make sure 5729 * we stop all initializtion activity here before we 5730 * set the spa_final_txg. This will ensure that all 5731 * dirty data resulting from the initialization is 5732 * committed to disk before we unload the pool. 5733 */ 5734 if (spa->spa_root_vdev != NULL) { 5735 vdev_initialize_stop_all(spa->spa_root_vdev, 5736 VDEV_INITIALIZE_ACTIVE); 5737 } 5738 5739 /* 5740 * We want this to be reflected on every label, 5741 * so mark them all dirty. spa_unload() will do the 5742 * final sync that pushes these changes out. 5743 */ 5744 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 5745 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5746 spa->spa_state = new_state; 5747 spa->spa_final_txg = spa_last_synced_txg(spa) + 5748 TXG_DEFER_SIZE + 1; 5749 vdev_config_dirty(spa->spa_root_vdev); 5750 spa_config_exit(spa, SCL_ALL, FTAG); 5751 } 5752 } 5753 5754 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_DESTROY); 5755 5756 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 5757 spa_unload(spa); 5758 spa_deactivate(spa); 5759 } 5760 5761 if (oldconfig && spa->spa_config) 5762 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 5763 5764 if (new_state != POOL_STATE_UNINITIALIZED) { 5765 if (!hardforce) 5766 spa_write_cachefile(spa, B_TRUE, B_TRUE); 5767 spa_remove(spa); 5768 } 5769 mutex_exit(&spa_namespace_lock); 5770 5771 return (0); 5772} 5773 5774/* 5775 * Destroy a storage pool. 5776 */ 5777int 5778spa_destroy(char *pool) 5779{ 5780 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 5781 B_FALSE, B_FALSE)); 5782} 5783 5784/* 5785 * Export a storage pool. 5786 */ 5787int 5788spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 5789 boolean_t hardforce) 5790{ 5791 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 5792 force, hardforce)); 5793} 5794 5795/* 5796 * Similar to spa_export(), this unloads the spa_t without actually removing it 5797 * from the namespace in any way. 5798 */ 5799int 5800spa_reset(char *pool) 5801{ 5802 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 5803 B_FALSE, B_FALSE)); 5804} 5805 5806/* 5807 * ========================================================================== 5808 * Device manipulation 5809 * ========================================================================== 5810 */ 5811 5812/* 5813 * Add a device to a storage pool. 5814 */ 5815int 5816spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 5817{ 5818 uint64_t txg, id; 5819 int error; 5820 vdev_t *rvd = spa->spa_root_vdev; 5821 vdev_t *vd, *tvd; 5822 nvlist_t **spares, **l2cache; 5823 uint_t nspares, nl2cache; 5824 5825 ASSERT(spa_writeable(spa)); 5826 5827 txg = spa_vdev_enter(spa); 5828 5829 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 5830 VDEV_ALLOC_ADD)) != 0) 5831 return (spa_vdev_exit(spa, NULL, txg, error)); 5832 5833 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 5834 5835 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 5836 &nspares) != 0) 5837 nspares = 0; 5838 5839 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 5840 &nl2cache) != 0) 5841 nl2cache = 0; 5842 5843 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 5844 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 5845 5846 if (vd->vdev_children != 0 && 5847 (error = vdev_create(vd, txg, B_FALSE)) != 0) 5848 return (spa_vdev_exit(spa, vd, txg, error)); 5849 5850 /* 5851 * We must validate the spares and l2cache devices after checking the 5852 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 5853 */ 5854 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 5855 return (spa_vdev_exit(spa, vd, txg, error)); 5856 5857 /* 5858 * If we are in the middle of a device removal, we can only add 5859 * devices which match the existing devices in the pool. 5860 * If we are in the middle of a removal, or have some indirect 5861 * vdevs, we can not add raidz toplevels. 5862 */ 5863 if (spa->spa_vdev_removal != NULL || 5864 spa->spa_removing_phys.sr_prev_indirect_vdev != -1) { 5865 for (int c = 0; c < vd->vdev_children; c++) { 5866 tvd = vd->vdev_child[c]; 5867 if (spa->spa_vdev_removal != NULL && 5868 tvd->vdev_ashift != spa->spa_max_ashift) { 5869 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 5870 } 5871 /* Fail if top level vdev is raidz */ 5872 if (tvd->vdev_ops == &vdev_raidz_ops) { 5873 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 5874 } 5875 /* 5876 * Need the top level mirror to be 5877 * a mirror of leaf vdevs only 5878 */ 5879 if (tvd->vdev_ops == &vdev_mirror_ops) { 5880 for (uint64_t cid = 0; 5881 cid < tvd->vdev_children; cid++) { 5882 vdev_t *cvd = tvd->vdev_child[cid]; 5883 if (!cvd->vdev_ops->vdev_op_leaf) { 5884 return (spa_vdev_exit(spa, vd, 5885 txg, EINVAL)); 5886 } 5887 } 5888 } 5889 } 5890 } 5891 5892 for (int c = 0; c < vd->vdev_children; c++) { 5893 5894 /* 5895 * Set the vdev id to the first hole, if one exists. 5896 */ 5897 for (id = 0; id < rvd->vdev_children; id++) { 5898 if (rvd->vdev_child[id]->vdev_ishole) { 5899 vdev_free(rvd->vdev_child[id]); 5900 break; 5901 } 5902 } 5903 tvd = vd->vdev_child[c]; 5904 vdev_remove_child(vd, tvd); 5905 tvd->vdev_id = id; 5906 vdev_add_child(rvd, tvd); 5907 vdev_config_dirty(tvd); 5908 } 5909 5910 if (nspares != 0) { 5911 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 5912 ZPOOL_CONFIG_SPARES); 5913 spa_load_spares(spa); 5914 spa->spa_spares.sav_sync = B_TRUE; 5915 } 5916 5917 if (nl2cache != 0) { 5918 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 5919 ZPOOL_CONFIG_L2CACHE); 5920 spa_load_l2cache(spa); 5921 spa->spa_l2cache.sav_sync = B_TRUE; 5922 } 5923 5924 /* 5925 * We have to be careful when adding new vdevs to an existing pool. 5926 * If other threads start allocating from these vdevs before we 5927 * sync the config cache, and we lose power, then upon reboot we may 5928 * fail to open the pool because there are DVAs that the config cache 5929 * can't translate. Therefore, we first add the vdevs without 5930 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 5931 * and then let spa_config_update() initialize the new metaslabs. 5932 * 5933 * spa_load() checks for added-but-not-initialized vdevs, so that 5934 * if we lose power at any point in this sequence, the remaining 5935 * steps will be completed the next time we load the pool. 5936 */ 5937 (void) spa_vdev_exit(spa, vd, txg, 0); 5938 5939 mutex_enter(&spa_namespace_lock); 5940 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 5941 spa_event_notify(spa, NULL, NULL, ESC_ZFS_VDEV_ADD); 5942 mutex_exit(&spa_namespace_lock); 5943 5944 return (0); 5945} 5946 5947/* 5948 * Attach a device to a mirror. The arguments are the path to any device 5949 * in the mirror, and the nvroot for the new device. If the path specifies 5950 * a device that is not mirrored, we automatically insert the mirror vdev. 5951 * 5952 * If 'replacing' is specified, the new device is intended to replace the 5953 * existing device; in this case the two devices are made into their own 5954 * mirror using the 'replacing' vdev, which is functionally identical to 5955 * the mirror vdev (it actually reuses all the same ops) but has a few 5956 * extra rules: you can't attach to it after it's been created, and upon 5957 * completion of resilvering, the first disk (the one being replaced) 5958 * is automatically detached. 5959 */ 5960int 5961spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 5962{ 5963 uint64_t txg, dtl_max_txg; 5964 vdev_t *rvd = spa->spa_root_vdev; 5965 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 5966 vdev_ops_t *pvops; 5967 char *oldvdpath, *newvdpath; 5968 int newvd_isspare; 5969 int error; 5970 5971 ASSERT(spa_writeable(spa)); 5972 5973 txg = spa_vdev_enter(spa); 5974 5975 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 5976 5977 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5978 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 5979 error = (spa_has_checkpoint(spa)) ? 5980 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 5981 return (spa_vdev_exit(spa, NULL, txg, error)); 5982 } 5983 5984 if (spa->spa_vdev_removal != NULL) 5985 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5986 5987 if (oldvd == NULL) 5988 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 5989 5990 if (!oldvd->vdev_ops->vdev_op_leaf) 5991 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5992 5993 pvd = oldvd->vdev_parent; 5994 5995 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 5996 VDEV_ALLOC_ATTACH)) != 0) 5997 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5998 5999 if (newrootvd->vdev_children != 1) 6000 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 6001 6002 newvd = newrootvd->vdev_child[0]; 6003 6004 if (!newvd->vdev_ops->vdev_op_leaf) 6005 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 6006 6007 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 6008 return (spa_vdev_exit(spa, newrootvd, txg, error)); 6009 6010 /* 6011 * Spares can't replace logs 6012 */ 6013 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 6014 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 6015 6016 if (!replacing) { 6017 /* 6018 * For attach, the only allowable parent is a mirror or the root 6019 * vdev. 6020 */ 6021 if (pvd->vdev_ops != &vdev_mirror_ops && 6022 pvd->vdev_ops != &vdev_root_ops) 6023 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 6024 6025 pvops = &vdev_mirror_ops; 6026 } else { 6027 /* 6028 * Active hot spares can only be replaced by inactive hot 6029 * spares. 6030 */ 6031 if (pvd->vdev_ops == &vdev_spare_ops && 6032 oldvd->vdev_isspare && 6033 !spa_has_spare(spa, newvd->vdev_guid)) 6034 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 6035 6036 /* 6037 * If the source is a hot spare, and the parent isn't already a 6038 * spare, then we want to create a new hot spare. Otherwise, we 6039 * want to create a replacing vdev. The user is not allowed to 6040 * attach to a spared vdev child unless the 'isspare' state is 6041 * the same (spare replaces spare, non-spare replaces 6042 * non-spare). 6043 */ 6044 if (pvd->vdev_ops == &vdev_replacing_ops && 6045 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 6046 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 6047 } else if (pvd->vdev_ops == &vdev_spare_ops && 6048 newvd->vdev_isspare != oldvd->vdev_isspare) { 6049 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 6050 } 6051 6052 if (newvd->vdev_isspare) 6053 pvops = &vdev_spare_ops; 6054 else 6055 pvops = &vdev_replacing_ops; 6056 } 6057 6058 /* 6059 * Make sure the new device is big enough. 6060 */ 6061 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 6062 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 6063 6064 /* 6065 * The new device cannot have a higher alignment requirement 6066 * than the top-level vdev. 6067 */ 6068 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 6069 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 6070 6071 /* 6072 * If this is an in-place replacement, update oldvd's path and devid 6073 * to make it distinguishable from newvd, and unopenable from now on. 6074 */ 6075 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 6076 spa_strfree(oldvd->vdev_path); 6077 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 6078 KM_SLEEP); 6079 (void) sprintf(oldvd->vdev_path, "%s/%s", 6080 newvd->vdev_path, "old"); 6081 if (oldvd->vdev_devid != NULL) { 6082 spa_strfree(oldvd->vdev_devid); 6083 oldvd->vdev_devid = NULL; 6084 } 6085 } 6086 6087 /* mark the device being resilvered */ 6088 newvd->vdev_resilver_txg = txg; 6089 6090 /* 6091 * If the parent is not a mirror, or if we're replacing, insert the new 6092 * mirror/replacing/spare vdev above oldvd. 6093 */ 6094 if (pvd->vdev_ops != pvops) 6095 pvd = vdev_add_parent(oldvd, pvops); 6096 6097 ASSERT(pvd->vdev_top->vdev_parent == rvd); 6098 ASSERT(pvd->vdev_ops == pvops); 6099 ASSERT(oldvd->vdev_parent == pvd); 6100 6101 /* 6102 * Extract the new device from its root and add it to pvd. 6103 */ 6104 vdev_remove_child(newrootvd, newvd); 6105 newvd->vdev_id = pvd->vdev_children; 6106 newvd->vdev_crtxg = oldvd->vdev_crtxg; 6107 vdev_add_child(pvd, newvd); 6108 6109 tvd = newvd->vdev_top; 6110 ASSERT(pvd->vdev_top == tvd); 6111 ASSERT(tvd->vdev_parent == rvd); 6112 6113 vdev_config_dirty(tvd); 6114 6115 /* 6116 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 6117 * for any dmu_sync-ed blocks. It will propagate upward when 6118 * spa_vdev_exit() calls vdev_dtl_reassess(). 6119 */ 6120 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 6121 6122 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 6123 dtl_max_txg - TXG_INITIAL); 6124 6125 if (newvd->vdev_isspare) { 6126 spa_spare_activate(newvd); 6127 spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_SPARE); 6128 } 6129 6130 oldvdpath = spa_strdup(oldvd->vdev_path); 6131 newvdpath = spa_strdup(newvd->vdev_path); 6132 newvd_isspare = newvd->vdev_isspare; 6133 6134 /* 6135 * Mark newvd's DTL dirty in this txg. 6136 */ 6137 vdev_dirty(tvd, VDD_DTL, newvd, txg); 6138 6139 /* 6140 * Schedule the resilver to restart in the future. We do this to 6141 * ensure that dmu_sync-ed blocks have been stitched into the 6142 * respective datasets. 6143 */ 6144 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 6145 6146 if (spa->spa_bootfs) 6147 spa_event_notify(spa, newvd, NULL, ESC_ZFS_BOOTFS_VDEV_ATTACH); 6148 6149 spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_ATTACH); 6150 6151 /* 6152 * Commit the config 6153 */ 6154 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 6155 6156 spa_history_log_internal(spa, "vdev attach", NULL, 6157 "%s vdev=%s %s vdev=%s", 6158 replacing && newvd_isspare ? "spare in" : 6159 replacing ? "replace" : "attach", newvdpath, 6160 replacing ? "for" : "to", oldvdpath); 6161 6162 spa_strfree(oldvdpath); 6163 spa_strfree(newvdpath); 6164 6165 return (0); 6166} 6167 6168/* 6169 * Detach a device from a mirror or replacing vdev. 6170 * 6171 * If 'replace_done' is specified, only detach if the parent 6172 * is a replacing vdev. 6173 */ 6174int 6175spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 6176{ 6177 uint64_t txg; 6178 int error; 6179 vdev_t *rvd = spa->spa_root_vdev; 6180 vdev_t *vd, *pvd, *cvd, *tvd; 6181 boolean_t unspare = B_FALSE; 6182 uint64_t unspare_guid = 0; 6183 char *vdpath; 6184 6185 ASSERT(spa_writeable(spa)); 6186 6187 txg = spa_vdev_enter(spa); 6188 6189 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 6190 6191 /* 6192 * Besides being called directly from the userland through the 6193 * ioctl interface, spa_vdev_detach() can be potentially called 6194 * at the end of spa_vdev_resilver_done(). 6195 * 6196 * In the regular case, when we have a checkpoint this shouldn't 6197 * happen as we never empty the DTLs of a vdev during the scrub 6198 * [see comment in dsl_scan_done()]. Thus spa_vdev_resilvering_done() 6199 * should never get here when we have a checkpoint. 6200 * 6201 * That said, even in a case when we checkpoint the pool exactly 6202 * as spa_vdev_resilver_done() calls this function everything 6203 * should be fine as the resilver will return right away. 6204 */ 6205 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 6206 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 6207 error = (spa_has_checkpoint(spa)) ? 6208 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 6209 return (spa_vdev_exit(spa, NULL, txg, error)); 6210 } 6211 6212 if (vd == NULL) 6213 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 6214 6215 if (!vd->vdev_ops->vdev_op_leaf) 6216 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 6217 6218 pvd = vd->vdev_parent; 6219 6220 /* 6221 * If the parent/child relationship is not as expected, don't do it. 6222 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 6223 * vdev that's replacing B with C. The user's intent in replacing 6224 * is to go from M(A,B) to M(A,C). If the user decides to cancel 6225 * the replace by detaching C, the expected behavior is to end up 6226 * M(A,B). But suppose that right after deciding to detach C, 6227 * the replacement of B completes. We would have M(A,C), and then 6228 * ask to detach C, which would leave us with just A -- not what 6229 * the user wanted. To prevent this, we make sure that the 6230 * parent/child relationship hasn't changed -- in this example, 6231 * that C's parent is still the replacing vdev R. 6232 */ 6233 if (pvd->vdev_guid != pguid && pguid != 0) 6234 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 6235 6236 /* 6237 * Only 'replacing' or 'spare' vdevs can be replaced. 6238 */ 6239 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 6240 pvd->vdev_ops != &vdev_spare_ops) 6241 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 6242 6243 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 6244 spa_version(spa) >= SPA_VERSION_SPARES); 6245 6246 /* 6247 * Only mirror, replacing, and spare vdevs support detach. 6248 */ 6249 if (pvd->vdev_ops != &vdev_replacing_ops && 6250 pvd->vdev_ops != &vdev_mirror_ops && 6251 pvd->vdev_ops != &vdev_spare_ops) 6252 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 6253 6254 /* 6255 * If this device has the only valid copy of some data, 6256 * we cannot safely detach it. 6257 */ 6258 if (vdev_dtl_required(vd)) 6259 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 6260 6261 ASSERT(pvd->vdev_children >= 2); 6262 6263 /* 6264 * If we are detaching the second disk from a replacing vdev, then 6265 * check to see if we changed the original vdev's path to have "/old" 6266 * at the end in spa_vdev_attach(). If so, undo that change now. 6267 */ 6268 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 6269 vd->vdev_path != NULL) { 6270 size_t len = strlen(vd->vdev_path); 6271 6272 for (int c = 0; c < pvd->vdev_children; c++) { 6273 cvd = pvd->vdev_child[c]; 6274 6275 if (cvd == vd || cvd->vdev_path == NULL) 6276 continue; 6277 6278 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 6279 strcmp(cvd->vdev_path + len, "/old") == 0) { 6280 spa_strfree(cvd->vdev_path); 6281 cvd->vdev_path = spa_strdup(vd->vdev_path); 6282 break; 6283 } 6284 } 6285 } 6286 6287 /* 6288 * If we are detaching the original disk from a spare, then it implies 6289 * that the spare should become a real disk, and be removed from the 6290 * active spare list for the pool. 6291 */ 6292 if (pvd->vdev_ops == &vdev_spare_ops && 6293 vd->vdev_id == 0 && 6294 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 6295 unspare = B_TRUE; 6296 6297 /* 6298 * Erase the disk labels so the disk can be used for other things. 6299 * This must be done after all other error cases are handled, 6300 * but before we disembowel vd (so we can still do I/O to it). 6301 * But if we can't do it, don't treat the error as fatal -- 6302 * it may be that the unwritability of the disk is the reason 6303 * it's being detached! 6304 */ 6305 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 6306 6307 /* 6308 * Remove vd from its parent and compact the parent's children. 6309 */ 6310 vdev_remove_child(pvd, vd); 6311 vdev_compact_children(pvd); 6312 6313 /* 6314 * Remember one of the remaining children so we can get tvd below. 6315 */ 6316 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 6317 6318 /* 6319 * If we need to remove the remaining child from the list of hot spares, 6320 * do it now, marking the vdev as no longer a spare in the process. 6321 * We must do this before vdev_remove_parent(), because that can 6322 * change the GUID if it creates a new toplevel GUID. For a similar 6323 * reason, we must remove the spare now, in the same txg as the detach; 6324 * otherwise someone could attach a new sibling, change the GUID, and 6325 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 6326 */ 6327 if (unspare) { 6328 ASSERT(cvd->vdev_isspare); 6329 spa_spare_remove(cvd); 6330 unspare_guid = cvd->vdev_guid; 6331 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 6332 cvd->vdev_unspare = B_TRUE; 6333 } 6334 6335 /* 6336 * If the parent mirror/replacing vdev only has one child, 6337 * the parent is no longer needed. Remove it from the tree. 6338 */ 6339 if (pvd->vdev_children == 1) { 6340 if (pvd->vdev_ops == &vdev_spare_ops) 6341 cvd->vdev_unspare = B_FALSE; 6342 vdev_remove_parent(cvd); 6343 } 6344 6345 6346 /* 6347 * We don't set tvd until now because the parent we just removed 6348 * may have been the previous top-level vdev. 6349 */ 6350 tvd = cvd->vdev_top; 6351 ASSERT(tvd->vdev_parent == rvd); 6352 6353 /* 6354 * Reevaluate the parent vdev state. 6355 */ 6356 vdev_propagate_state(cvd); 6357 6358 /* 6359 * If the 'autoexpand' property is set on the pool then automatically 6360 * try to expand the size of the pool. For example if the device we 6361 * just detached was smaller than the others, it may be possible to 6362 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 6363 * first so that we can obtain the updated sizes of the leaf vdevs. 6364 */ 6365 if (spa->spa_autoexpand) { 6366 vdev_reopen(tvd); 6367 vdev_expand(tvd, txg); 6368 } 6369 6370 vdev_config_dirty(tvd); 6371 6372 /* 6373 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 6374 * vd->vdev_detached is set and free vd's DTL object in syncing context. 6375 * But first make sure we're not on any *other* txg's DTL list, to 6376 * prevent vd from being accessed after it's freed. 6377 */ 6378 vdpath = spa_strdup(vd->vdev_path); 6379 for (int t = 0; t < TXG_SIZE; t++) 6380 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 6381 vd->vdev_detached = B_TRUE; 6382 vdev_dirty(tvd, VDD_DTL, vd, txg); 6383 6384 spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_REMOVE); 6385 6386 /* hang on to the spa before we release the lock */ 6387 spa_open_ref(spa, FTAG); 6388 6389 error = spa_vdev_exit(spa, vd, txg, 0); 6390 6391 spa_history_log_internal(spa, "detach", NULL, 6392 "vdev=%s", vdpath); 6393 spa_strfree(vdpath); 6394 6395 /* 6396 * If this was the removal of the original device in a hot spare vdev, 6397 * then we want to go through and remove the device from the hot spare 6398 * list of every other pool. 6399 */ 6400 if (unspare) { 6401 spa_t *altspa = NULL; 6402 6403 mutex_enter(&spa_namespace_lock); 6404 while ((altspa = spa_next(altspa)) != NULL) { 6405 if (altspa->spa_state != POOL_STATE_ACTIVE || 6406 altspa == spa) 6407 continue; 6408 6409 spa_open_ref(altspa, FTAG); 6410 mutex_exit(&spa_namespace_lock); 6411 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 6412 mutex_enter(&spa_namespace_lock); 6413 spa_close(altspa, FTAG); 6414 } 6415 mutex_exit(&spa_namespace_lock); 6416 6417 /* search the rest of the vdevs for spares to remove */ 6418 spa_vdev_resilver_done(spa); 6419 } 6420 6421 /* all done with the spa; OK to release */ 6422 mutex_enter(&spa_namespace_lock); 6423 spa_close(spa, FTAG); 6424 mutex_exit(&spa_namespace_lock); 6425 6426 return (error); 6427} 6428 6429int 6430spa_vdev_initialize(spa_t *spa, uint64_t guid, uint64_t cmd_type) 6431{ 6432 /* 6433 * We hold the namespace lock through the whole function 6434 * to prevent any changes to the pool while we're starting or 6435 * stopping initialization. The config and state locks are held so that 6436 * we can properly assess the vdev state before we commit to 6437 * the initializing operation. 6438 */ 6439 mutex_enter(&spa_namespace_lock); 6440 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 6441 6442 /* Look up vdev and ensure it's a leaf. */ 6443 vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE); 6444 if (vd == NULL || vd->vdev_detached) { 6445 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6446 mutex_exit(&spa_namespace_lock); 6447 return (SET_ERROR(ENODEV)); 6448 } else if (!vd->vdev_ops->vdev_op_leaf || !vdev_is_concrete(vd)) { 6449 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6450 mutex_exit(&spa_namespace_lock); 6451 return (SET_ERROR(EINVAL)); 6452 } else if (!vdev_writeable(vd)) { 6453 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6454 mutex_exit(&spa_namespace_lock); 6455 return (SET_ERROR(EROFS)); 6456 } 6457 mutex_enter(&vd->vdev_initialize_lock); 6458 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6459 6460 /* 6461 * When we activate an initialize action we check to see 6462 * if the vdev_initialize_thread is NULL. We do this instead 6463 * of using the vdev_initialize_state since there might be 6464 * a previous initialization process which has completed but 6465 * the thread is not exited. 6466 */ 6467 if (cmd_type == POOL_INITIALIZE_DO && 6468 (vd->vdev_initialize_thread != NULL || 6469 vd->vdev_top->vdev_removing)) { 6470 mutex_exit(&vd->vdev_initialize_lock); 6471 mutex_exit(&spa_namespace_lock); 6472 return (SET_ERROR(EBUSY)); 6473 } else if (cmd_type == POOL_INITIALIZE_CANCEL && 6474 (vd->vdev_initialize_state != VDEV_INITIALIZE_ACTIVE && 6475 vd->vdev_initialize_state != VDEV_INITIALIZE_SUSPENDED)) { 6476 mutex_exit(&vd->vdev_initialize_lock); 6477 mutex_exit(&spa_namespace_lock); 6478 return (SET_ERROR(ESRCH)); 6479 } else if (cmd_type == POOL_INITIALIZE_SUSPEND && 6480 vd->vdev_initialize_state != VDEV_INITIALIZE_ACTIVE) { 6481 mutex_exit(&vd->vdev_initialize_lock); 6482 mutex_exit(&spa_namespace_lock); 6483 return (SET_ERROR(ESRCH)); 6484 } 6485 6486 switch (cmd_type) { 6487 case POOL_INITIALIZE_DO: 6488 vdev_initialize(vd); 6489 break; 6490 case POOL_INITIALIZE_CANCEL: 6491 vdev_initialize_stop(vd, VDEV_INITIALIZE_CANCELED); 6492 break; 6493 case POOL_INITIALIZE_SUSPEND: 6494 vdev_initialize_stop(vd, VDEV_INITIALIZE_SUSPENDED); 6495 break; 6496 default: 6497 panic("invalid cmd_type %llu", (unsigned long long)cmd_type); 6498 } 6499 mutex_exit(&vd->vdev_initialize_lock); 6500 6501 /* Sync out the initializing state */ 6502 txg_wait_synced(spa->spa_dsl_pool, 0); 6503 mutex_exit(&spa_namespace_lock); 6504 6505 return (0); 6506} 6507 6508 6509/* 6510 * Split a set of devices from their mirrors, and create a new pool from them. 6511 */ 6512int 6513spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 6514 nvlist_t *props, boolean_t exp) 6515{ 6516 int error = 0; 6517 uint64_t txg, *glist; 6518 spa_t *newspa; 6519 uint_t c, children, lastlog; 6520 nvlist_t **child, *nvl, *tmp; 6521 dmu_tx_t *tx; 6522 char *altroot = NULL; 6523 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 6524 boolean_t activate_slog; 6525 6526 ASSERT(spa_writeable(spa)); 6527 6528 txg = spa_vdev_enter(spa); 6529 6530 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 6531 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 6532 error = (spa_has_checkpoint(spa)) ? 6533 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 6534 return (spa_vdev_exit(spa, NULL, txg, error)); 6535 } 6536 6537 /* clear the log and flush everything up to now */ 6538 activate_slog = spa_passivate_log(spa); 6539 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 6540 error = spa_reset_logs(spa); 6541 txg = spa_vdev_config_enter(spa); 6542 6543 if (activate_slog) 6544 spa_activate_log(spa); 6545 6546 if (error != 0) 6547 return (spa_vdev_exit(spa, NULL, txg, error)); 6548 6549 /* check new spa name before going any further */ 6550 if (spa_lookup(newname) != NULL) 6551 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 6552 6553 /* 6554 * scan through all the children to ensure they're all mirrors 6555 */ 6556 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 6557 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 6558 &children) != 0) 6559 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 6560 6561 /* first, check to ensure we've got the right child count */ 6562 rvd = spa->spa_root_vdev; 6563 lastlog = 0; 6564 for (c = 0; c < rvd->vdev_children; c++) { 6565 vdev_t *vd = rvd->vdev_child[c]; 6566 6567 /* don't count the holes & logs as children */ 6568 if (vd->vdev_islog || !vdev_is_concrete(vd)) { 6569 if (lastlog == 0) 6570 lastlog = c; 6571 continue; 6572 } 6573 6574 lastlog = 0; 6575 } 6576 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 6577 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 6578 6579 /* next, ensure no spare or cache devices are part of the split */ 6580 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 6581 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 6582 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 6583 6584 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 6585 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 6586 6587 /* then, loop over each vdev and validate it */ 6588 for (c = 0; c < children; c++) { 6589 uint64_t is_hole = 0; 6590 6591 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 6592 &is_hole); 6593 6594 if (is_hole != 0) { 6595 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 6596 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 6597 continue; 6598 } else { 6599 error = SET_ERROR(EINVAL); 6600 break; 6601 } 6602 } 6603 6604 /* which disk is going to be split? */ 6605 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 6606 &glist[c]) != 0) { 6607 error = SET_ERROR(EINVAL); 6608 break; 6609 } 6610 6611 /* look it up in the spa */ 6612 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 6613 if (vml[c] == NULL) { 6614 error = SET_ERROR(ENODEV); 6615 break; 6616 } 6617 6618 /* make sure there's nothing stopping the split */ 6619 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 6620 vml[c]->vdev_islog || 6621 !vdev_is_concrete(vml[c]) || 6622 vml[c]->vdev_isspare || 6623 vml[c]->vdev_isl2cache || 6624 !vdev_writeable(vml[c]) || 6625 vml[c]->vdev_children != 0 || 6626 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 6627 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 6628 error = SET_ERROR(EINVAL); 6629 break; 6630 } 6631 6632 if (vdev_dtl_required(vml[c])) { 6633 error = SET_ERROR(EBUSY); 6634 break; 6635 } 6636 6637 /* we need certain info from the top level */ 6638 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 6639 vml[c]->vdev_top->vdev_ms_array) == 0); 6640 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 6641 vml[c]->vdev_top->vdev_ms_shift) == 0); 6642 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 6643 vml[c]->vdev_top->vdev_asize) == 0); 6644 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 6645 vml[c]->vdev_top->vdev_ashift) == 0); 6646 6647 /* transfer per-vdev ZAPs */ 6648 ASSERT3U(vml[c]->vdev_leaf_zap, !=, 0); 6649 VERIFY0(nvlist_add_uint64(child[c], 6650 ZPOOL_CONFIG_VDEV_LEAF_ZAP, vml[c]->vdev_leaf_zap)); 6651 6652 ASSERT3U(vml[c]->vdev_top->vdev_top_zap, !=, 0); 6653 VERIFY0(nvlist_add_uint64(child[c], 6654 ZPOOL_CONFIG_VDEV_TOP_ZAP, 6655 vml[c]->vdev_parent->vdev_top_zap)); 6656 } 6657 6658 if (error != 0) { 6659 kmem_free(vml, children * sizeof (vdev_t *)); 6660 kmem_free(glist, children * sizeof (uint64_t)); 6661 return (spa_vdev_exit(spa, NULL, txg, error)); 6662 } 6663 6664 /* stop writers from using the disks */ 6665 for (c = 0; c < children; c++) { 6666 if (vml[c] != NULL) 6667 vml[c]->vdev_offline = B_TRUE; 6668 } 6669 vdev_reopen(spa->spa_root_vdev); 6670 6671 /* 6672 * Temporarily record the splitting vdevs in the spa config. This 6673 * will disappear once the config is regenerated. 6674 */ 6675 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6676 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 6677 glist, children) == 0); 6678 kmem_free(glist, children * sizeof (uint64_t)); 6679 6680 mutex_enter(&spa->spa_props_lock); 6681 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 6682 nvl) == 0); 6683 mutex_exit(&spa->spa_props_lock); 6684 spa->spa_config_splitting = nvl; 6685 vdev_config_dirty(spa->spa_root_vdev); 6686 6687 /* configure and create the new pool */ 6688 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 6689 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 6690 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 6691 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6692 spa_version(spa)) == 0); 6693 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 6694 spa->spa_config_txg) == 0); 6695 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 6696 spa_generate_guid(NULL)) == 0); 6697 VERIFY0(nvlist_add_boolean(config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); 6698 (void) nvlist_lookup_string(props, 6699 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 6700 6701 /* add the new pool to the namespace */ 6702 newspa = spa_add(newname, config, altroot); 6703 newspa->spa_avz_action = AVZ_ACTION_REBUILD; 6704 newspa->spa_config_txg = spa->spa_config_txg; 6705 spa_set_log_state(newspa, SPA_LOG_CLEAR); 6706 6707 /* release the spa config lock, retaining the namespace lock */ 6708 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 6709 6710 if (zio_injection_enabled) 6711 zio_handle_panic_injection(spa, FTAG, 1); 6712 6713 spa_activate(newspa, spa_mode_global); 6714 spa_async_suspend(newspa); 6715 6716 for (c = 0; c < children; c++) { 6717 if (vml[c] != NULL) { 6718 /* 6719 * Temporarily stop the initializing activity. We set 6720 * the state to ACTIVE so that we know to resume 6721 * the initializing once the split has completed. 6722 */ 6723 mutex_enter(&vml[c]->vdev_initialize_lock); 6724 vdev_initialize_stop(vml[c], VDEV_INITIALIZE_ACTIVE); 6725 mutex_exit(&vml[c]->vdev_initialize_lock); 6726 } 6727 } 6728 6729#ifndef illumos 6730 /* mark that we are creating new spa by splitting */ 6731 newspa->spa_splitting_newspa = B_TRUE; 6732#endif 6733 newspa->spa_config_source = SPA_CONFIG_SRC_SPLIT; 6734 6735 /* create the new pool from the disks of the original pool */ 6736 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE); 6737#ifndef illumos 6738 newspa->spa_splitting_newspa = B_FALSE; 6739#endif 6740 if (error) 6741 goto out; 6742 6743 /* if that worked, generate a real config for the new pool */ 6744 if (newspa->spa_root_vdev != NULL) { 6745 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 6746 NV_UNIQUE_NAME, KM_SLEEP) == 0); 6747 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 6748 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 6749 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 6750 B_TRUE)); 6751 } 6752 6753 /* set the props */ 6754 if (props != NULL) { 6755 spa_configfile_set(newspa, props, B_FALSE); 6756 error = spa_prop_set(newspa, props); 6757 if (error) 6758 goto out; 6759 } 6760 6761 /* flush everything */ 6762 txg = spa_vdev_config_enter(newspa); 6763 vdev_config_dirty(newspa->spa_root_vdev); 6764 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 6765 6766 if (zio_injection_enabled) 6767 zio_handle_panic_injection(spa, FTAG, 2); 6768 6769 spa_async_resume(newspa); 6770 6771 /* finally, update the original pool's config */ 6772 txg = spa_vdev_config_enter(spa); 6773 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 6774 error = dmu_tx_assign(tx, TXG_WAIT); 6775 if (error != 0) 6776 dmu_tx_abort(tx); 6777 for (c = 0; c < children; c++) { 6778 if (vml[c] != NULL) { 6779 vdev_split(vml[c]); 6780 if (error == 0) 6781 spa_history_log_internal(spa, "detach", tx, 6782 "vdev=%s", vml[c]->vdev_path); 6783 6784 vdev_free(vml[c]); 6785 } 6786 } 6787 spa->spa_avz_action = AVZ_ACTION_REBUILD; 6788 vdev_config_dirty(spa->spa_root_vdev); 6789 spa->spa_config_splitting = NULL; 6790 nvlist_free(nvl); 6791 if (error == 0) 6792 dmu_tx_commit(tx); 6793 (void) spa_vdev_exit(spa, NULL, txg, 0); 6794 6795 if (zio_injection_enabled) 6796 zio_handle_panic_injection(spa, FTAG, 3); 6797 6798 /* split is complete; log a history record */ 6799 spa_history_log_internal(newspa, "split", NULL, 6800 "from pool %s", spa_name(spa)); 6801 6802 kmem_free(vml, children * sizeof (vdev_t *)); 6803 6804 /* if we're not going to mount the filesystems in userland, export */ 6805 if (exp) 6806 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 6807 B_FALSE, B_FALSE); 6808 6809 return (error); 6810 6811out: 6812 spa_unload(newspa); 6813 spa_deactivate(newspa); 6814 spa_remove(newspa); 6815 6816 txg = spa_vdev_config_enter(spa); 6817 6818 /* re-online all offlined disks */ 6819 for (c = 0; c < children; c++) { 6820 if (vml[c] != NULL) 6821 vml[c]->vdev_offline = B_FALSE; 6822 } 6823 6824 /* restart initializing disks as necessary */ 6825 spa_async_request(spa, SPA_ASYNC_INITIALIZE_RESTART); 6826 6827 vdev_reopen(spa->spa_root_vdev); 6828 6829 nvlist_free(spa->spa_config_splitting); 6830 spa->spa_config_splitting = NULL; 6831 (void) spa_vdev_exit(spa, NULL, txg, error); 6832 6833 kmem_free(vml, children * sizeof (vdev_t *)); 6834 return (error); 6835} 6836 6837/* 6838 * Find any device that's done replacing, or a vdev marked 'unspare' that's 6839 * currently spared, so we can detach it. 6840 */ 6841static vdev_t * 6842spa_vdev_resilver_done_hunt(vdev_t *vd) 6843{ 6844 vdev_t *newvd, *oldvd; 6845 6846 for (int c = 0; c < vd->vdev_children; c++) { 6847 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 6848 if (oldvd != NULL) 6849 return (oldvd); 6850 } 6851 6852 /* 6853 * Check for a completed replacement. We always consider the first 6854 * vdev in the list to be the oldest vdev, and the last one to be 6855 * the newest (see spa_vdev_attach() for how that works). In 6856 * the case where the newest vdev is faulted, we will not automatically 6857 * remove it after a resilver completes. This is OK as it will require 6858 * user intervention to determine which disk the admin wishes to keep. 6859 */ 6860 if (vd->vdev_ops == &vdev_replacing_ops) { 6861 ASSERT(vd->vdev_children > 1); 6862 6863 newvd = vd->vdev_child[vd->vdev_children - 1]; 6864 oldvd = vd->vdev_child[0]; 6865 6866 if (vdev_dtl_empty(newvd, DTL_MISSING) && 6867 vdev_dtl_empty(newvd, DTL_OUTAGE) && 6868 !vdev_dtl_required(oldvd)) 6869 return (oldvd); 6870 } 6871 6872 /* 6873 * Check for a completed resilver with the 'unspare' flag set. 6874 * Also potentially update faulted state. 6875 */ 6876 if (vd->vdev_ops == &vdev_spare_ops) { 6877 vdev_t *first = vd->vdev_child[0]; 6878 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 6879 6880 if (last->vdev_unspare) { 6881 oldvd = first; 6882 newvd = last; 6883 } else if (first->vdev_unspare) { 6884 oldvd = last; 6885 newvd = first; 6886 } else { 6887 oldvd = NULL; 6888 } 6889 6890 if (oldvd != NULL && 6891 vdev_dtl_empty(newvd, DTL_MISSING) && 6892 vdev_dtl_empty(newvd, DTL_OUTAGE) && 6893 !vdev_dtl_required(oldvd)) 6894 return (oldvd); 6895 6896 vdev_propagate_state(vd); 6897 6898 /* 6899 * If there are more than two spares attached to a disk, 6900 * and those spares are not required, then we want to 6901 * attempt to free them up now so that they can be used 6902 * by other pools. Once we're back down to a single 6903 * disk+spare, we stop removing them. 6904 */ 6905 if (vd->vdev_children > 2) { 6906 newvd = vd->vdev_child[1]; 6907 6908 if (newvd->vdev_isspare && last->vdev_isspare && 6909 vdev_dtl_empty(last, DTL_MISSING) && 6910 vdev_dtl_empty(last, DTL_OUTAGE) && 6911 !vdev_dtl_required(newvd)) 6912 return (newvd); 6913 } 6914 } 6915 6916 return (NULL); 6917} 6918 6919static void 6920spa_vdev_resilver_done(spa_t *spa) 6921{ 6922 vdev_t *vd, *pvd, *ppvd; 6923 uint64_t guid, sguid, pguid, ppguid; 6924 6925 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6926 6927 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 6928 pvd = vd->vdev_parent; 6929 ppvd = pvd->vdev_parent; 6930 guid = vd->vdev_guid; 6931 pguid = pvd->vdev_guid; 6932 ppguid = ppvd->vdev_guid; 6933 sguid = 0; 6934 /* 6935 * If we have just finished replacing a hot spared device, then 6936 * we need to detach the parent's first child (the original hot 6937 * spare) as well. 6938 */ 6939 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 6940 ppvd->vdev_children == 2) { 6941 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 6942 sguid = ppvd->vdev_child[1]->vdev_guid; 6943 } 6944 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 6945 6946 spa_config_exit(spa, SCL_ALL, FTAG); 6947 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 6948 return; 6949 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 6950 return; 6951 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6952 } 6953 6954 spa_config_exit(spa, SCL_ALL, FTAG); 6955} 6956 6957/* 6958 * Update the stored path or FRU for this vdev. 6959 */ 6960int 6961spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 6962 boolean_t ispath) 6963{ 6964 vdev_t *vd; 6965 boolean_t sync = B_FALSE; 6966 6967 ASSERT(spa_writeable(spa)); 6968 6969 spa_vdev_state_enter(spa, SCL_ALL); 6970 6971 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 6972 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 6973 6974 if (!vd->vdev_ops->vdev_op_leaf) 6975 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 6976 6977 if (ispath) { 6978 if (strcmp(value, vd->vdev_path) != 0) { 6979 spa_strfree(vd->vdev_path); 6980 vd->vdev_path = spa_strdup(value); 6981 sync = B_TRUE; 6982 } 6983 } else { 6984 if (vd->vdev_fru == NULL) { 6985 vd->vdev_fru = spa_strdup(value); 6986 sync = B_TRUE; 6987 } else if (strcmp(value, vd->vdev_fru) != 0) { 6988 spa_strfree(vd->vdev_fru); 6989 vd->vdev_fru = spa_strdup(value); 6990 sync = B_TRUE; 6991 } 6992 } 6993 6994 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 6995} 6996 6997int 6998spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 6999{ 7000 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 7001} 7002 7003int 7004spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 7005{ 7006 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 7007} 7008 7009/* 7010 * ========================================================================== 7011 * SPA Scanning 7012 * ========================================================================== 7013 */ 7014int 7015spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t cmd) 7016{ 7017 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 7018 7019 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 7020 return (SET_ERROR(EBUSY)); 7021 7022 return (dsl_scrub_set_pause_resume(spa->spa_dsl_pool, cmd)); 7023} 7024 7025int 7026spa_scan_stop(spa_t *spa) 7027{ 7028 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 7029 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 7030 return (SET_ERROR(EBUSY)); 7031 return (dsl_scan_cancel(spa->spa_dsl_pool)); 7032} 7033 7034int 7035spa_scan(spa_t *spa, pool_scan_func_t func) 7036{ 7037 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 7038 7039 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 7040 return (SET_ERROR(ENOTSUP)); 7041 7042 /* 7043 * If a resilver was requested, but there is no DTL on a 7044 * writeable leaf device, we have nothing to do. 7045 */ 7046 if (func == POOL_SCAN_RESILVER && 7047 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 7048 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 7049 return (0); 7050 } 7051 7052 return (dsl_scan(spa->spa_dsl_pool, func)); 7053} 7054 7055/* 7056 * ========================================================================== 7057 * SPA async task processing 7058 * ========================================================================== 7059 */ 7060 7061static void 7062spa_async_remove(spa_t *spa, vdev_t *vd) 7063{ 7064 if (vd->vdev_remove_wanted) { 7065 vd->vdev_remove_wanted = B_FALSE; 7066 vd->vdev_delayed_close = B_FALSE; 7067 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 7068 7069 /* 7070 * We want to clear the stats, but we don't want to do a full 7071 * vdev_clear() as that will cause us to throw away 7072 * degraded/faulted state as well as attempt to reopen the 7073 * device, all of which is a waste. 7074 */ 7075 vd->vdev_stat.vs_read_errors = 0; 7076 vd->vdev_stat.vs_write_errors = 0; 7077 vd->vdev_stat.vs_checksum_errors = 0; 7078 7079 vdev_state_dirty(vd->vdev_top); 7080 /* Tell userspace that the vdev is gone. */ 7081 zfs_post_remove(spa, vd); 7082 } 7083 7084 for (int c = 0; c < vd->vdev_children; c++) 7085 spa_async_remove(spa, vd->vdev_child[c]); 7086} 7087 7088static void 7089spa_async_probe(spa_t *spa, vdev_t *vd) 7090{ 7091 if (vd->vdev_probe_wanted) { 7092 vd->vdev_probe_wanted = B_FALSE; 7093 vdev_reopen(vd); /* vdev_open() does the actual probe */ 7094 } 7095 7096 for (int c = 0; c < vd->vdev_children; c++) 7097 spa_async_probe(spa, vd->vdev_child[c]); 7098} 7099 7100static void 7101spa_async_autoexpand(spa_t *spa, vdev_t *vd) 7102{ 7103 sysevent_id_t eid; 7104 nvlist_t *attr; 7105 char *physpath; 7106 7107 if (!spa->spa_autoexpand) 7108 return; 7109 7110 for (int c = 0; c < vd->vdev_children; c++) { 7111 vdev_t *cvd = vd->vdev_child[c]; 7112 spa_async_autoexpand(spa, cvd); 7113 } 7114 7115 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 7116 return; 7117 7118 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 7119 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 7120 7121 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 7122 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 7123 7124 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 7125 ESC_ZFS_VDEV_AUTOEXPAND, attr, &eid, DDI_SLEEP); 7126 7127 nvlist_free(attr); 7128 kmem_free(physpath, MAXPATHLEN); 7129} 7130 7131static void 7132spa_async_thread(void *arg) 7133{ 7134 spa_t *spa = (spa_t *)arg; 7135 int tasks; 7136 7137 ASSERT(spa->spa_sync_on); 7138 7139 mutex_enter(&spa->spa_async_lock); 7140 tasks = spa->spa_async_tasks; 7141 spa->spa_async_tasks &= SPA_ASYNC_REMOVE; 7142 mutex_exit(&spa->spa_async_lock); 7143 7144 /* 7145 * See if the config needs to be updated. 7146 */ 7147 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 7148 uint64_t old_space, new_space; 7149 7150 mutex_enter(&spa_namespace_lock); 7151 old_space = metaslab_class_get_space(spa_normal_class(spa)); 7152 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 7153 new_space = metaslab_class_get_space(spa_normal_class(spa)); 7154 mutex_exit(&spa_namespace_lock); 7155 7156 /* 7157 * If the pool grew as a result of the config update, 7158 * then log an internal history event. 7159 */ 7160 if (new_space != old_space) { 7161 spa_history_log_internal(spa, "vdev online", NULL, 7162 "pool '%s' size: %llu(+%llu)", 7163 spa_name(spa), new_space, new_space - old_space); 7164 } 7165 } 7166 7167 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 7168 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 7169 spa_async_autoexpand(spa, spa->spa_root_vdev); 7170 spa_config_exit(spa, SCL_CONFIG, FTAG); 7171 } 7172 7173 /* 7174 * See if any devices need to be probed. 7175 */ 7176 if (tasks & SPA_ASYNC_PROBE) { 7177 spa_vdev_state_enter(spa, SCL_NONE); 7178 spa_async_probe(spa, spa->spa_root_vdev); 7179 (void) spa_vdev_state_exit(spa, NULL, 0); 7180 } 7181 7182 /* 7183 * If any devices are done replacing, detach them. 7184 */ 7185 if (tasks & SPA_ASYNC_RESILVER_DONE) 7186 spa_vdev_resilver_done(spa); 7187 7188 /* 7189 * Kick off a resilver. 7190 */ 7191 if (tasks & SPA_ASYNC_RESILVER) 7192 dsl_resilver_restart(spa->spa_dsl_pool, 0); 7193 7194 if (tasks & SPA_ASYNC_INITIALIZE_RESTART) { 7195 mutex_enter(&spa_namespace_lock); 7196 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 7197 vdev_initialize_restart(spa->spa_root_vdev); 7198 spa_config_exit(spa, SCL_CONFIG, FTAG); 7199 mutex_exit(&spa_namespace_lock); 7200 } 7201 7202 /* 7203 * Let the world know that we're done. 7204 */ 7205 mutex_enter(&spa->spa_async_lock); 7206 spa->spa_async_thread = NULL; 7207 cv_broadcast(&spa->spa_async_cv); 7208 mutex_exit(&spa->spa_async_lock); 7209 thread_exit(); 7210} 7211 7212static void 7213spa_async_thread_vd(void *arg) 7214{ 7215 spa_t *spa = arg; 7216 int tasks; 7217 7218 mutex_enter(&spa->spa_async_lock); 7219 tasks = spa->spa_async_tasks; 7220retry: 7221 spa->spa_async_tasks &= ~SPA_ASYNC_REMOVE; 7222 mutex_exit(&spa->spa_async_lock); 7223 7224 /* 7225 * See if any devices need to be marked REMOVED. 7226 */ 7227 if (tasks & SPA_ASYNC_REMOVE) { 7228 spa_vdev_state_enter(spa, SCL_NONE); 7229 spa_async_remove(spa, spa->spa_root_vdev); 7230 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 7231 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 7232 for (int i = 0; i < spa->spa_spares.sav_count; i++) 7233 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 7234 (void) spa_vdev_state_exit(spa, NULL, 0); 7235 } 7236 7237 /* 7238 * Let the world know that we're done. 7239 */ 7240 mutex_enter(&spa->spa_async_lock); 7241 tasks = spa->spa_async_tasks; 7242 if ((tasks & SPA_ASYNC_REMOVE) != 0) 7243 goto retry; 7244 spa->spa_async_thread_vd = NULL; 7245 cv_broadcast(&spa->spa_async_cv); 7246 mutex_exit(&spa->spa_async_lock); 7247 thread_exit(); 7248} 7249 7250void 7251spa_async_suspend(spa_t *spa) 7252{ 7253 mutex_enter(&spa->spa_async_lock); 7254 spa->spa_async_suspended++; 7255 while (spa->spa_async_thread != NULL || 7256 spa->spa_async_thread_vd != NULL) 7257 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 7258 mutex_exit(&spa->spa_async_lock); 7259 7260 spa_vdev_remove_suspend(spa); 7261 7262 zthr_t *condense_thread = spa->spa_condense_zthr; 7263 if (condense_thread != NULL && zthr_isrunning(condense_thread)) 7264 VERIFY0(zthr_cancel(condense_thread)); 7265 7266 zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr; 7267 if (discard_thread != NULL && zthr_isrunning(discard_thread)) 7268 VERIFY0(zthr_cancel(discard_thread)); 7269} 7270 7271void 7272spa_async_resume(spa_t *spa) 7273{ 7274 mutex_enter(&spa->spa_async_lock); 7275 ASSERT(spa->spa_async_suspended != 0); 7276 spa->spa_async_suspended--; 7277 mutex_exit(&spa->spa_async_lock); 7278 spa_restart_removal(spa); 7279 7280 zthr_t *condense_thread = spa->spa_condense_zthr; 7281 if (condense_thread != NULL && !zthr_isrunning(condense_thread)) 7282 zthr_resume(condense_thread); 7283 7284 zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr; 7285 if (discard_thread != NULL && !zthr_isrunning(discard_thread)) 7286 zthr_resume(discard_thread); 7287} 7288 7289static boolean_t 7290spa_async_tasks_pending(spa_t *spa) 7291{ 7292 uint_t non_config_tasks; 7293 uint_t config_task; 7294 boolean_t config_task_suspended; 7295 7296 non_config_tasks = spa->spa_async_tasks & ~(SPA_ASYNC_CONFIG_UPDATE | 7297 SPA_ASYNC_REMOVE); 7298 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 7299 if (spa->spa_ccw_fail_time == 0) { 7300 config_task_suspended = B_FALSE; 7301 } else { 7302 config_task_suspended = 7303 (gethrtime() - spa->spa_ccw_fail_time) < 7304 (zfs_ccw_retry_interval * NANOSEC); 7305 } 7306 7307 return (non_config_tasks || (config_task && !config_task_suspended)); 7308} 7309 7310static void 7311spa_async_dispatch(spa_t *spa) 7312{ 7313 mutex_enter(&spa->spa_async_lock); 7314 if (spa_async_tasks_pending(spa) && 7315 !spa->spa_async_suspended && 7316 spa->spa_async_thread == NULL && 7317 rootdir != NULL) 7318 spa->spa_async_thread = thread_create(NULL, 0, 7319 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 7320 mutex_exit(&spa->spa_async_lock); 7321} 7322 7323static void 7324spa_async_dispatch_vd(spa_t *spa) 7325{ 7326 mutex_enter(&spa->spa_async_lock); 7327 if ((spa->spa_async_tasks & SPA_ASYNC_REMOVE) != 0 && 7328 !spa->spa_async_suspended && 7329 spa->spa_async_thread_vd == NULL && 7330 rootdir != NULL) 7331 spa->spa_async_thread_vd = thread_create(NULL, 0, 7332 spa_async_thread_vd, spa, 0, &p0, TS_RUN, maxclsyspri); 7333 mutex_exit(&spa->spa_async_lock); 7334} 7335 7336void 7337spa_async_request(spa_t *spa, int task) 7338{ 7339 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 7340 mutex_enter(&spa->spa_async_lock); 7341 spa->spa_async_tasks |= task; 7342 mutex_exit(&spa->spa_async_lock); 7343 spa_async_dispatch_vd(spa); 7344} 7345 7346/* 7347 * ========================================================================== 7348 * SPA syncing routines 7349 * ========================================================================== 7350 */ 7351 7352static int 7353bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 7354{ 7355 bpobj_t *bpo = arg; 7356 bpobj_enqueue(bpo, bp, tx); 7357 return (0); 7358} 7359 7360static int 7361spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 7362{ 7363 zio_t *zio = arg; 7364 7365 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 7366 BP_GET_PSIZE(bp), zio->io_flags)); 7367 return (0); 7368} 7369 7370/* 7371 * Note: this simple function is not inlined to make it easier to dtrace the 7372 * amount of time spent syncing frees. 7373 */ 7374static void 7375spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 7376{ 7377 zio_t *zio = zio_root(spa, NULL, NULL, 0); 7378 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 7379 VERIFY(zio_wait(zio) == 0); 7380} 7381 7382/* 7383 * Note: this simple function is not inlined to make it easier to dtrace the 7384 * amount of time spent syncing deferred frees. 7385 */ 7386static void 7387spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 7388{ 7389 zio_t *zio = zio_root(spa, NULL, NULL, 0); 7390 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 7391 spa_free_sync_cb, zio, tx), ==, 0); 7392 VERIFY0(zio_wait(zio)); 7393} 7394 7395 7396static void 7397spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 7398{ 7399 char *packed = NULL; 7400 size_t bufsize; 7401 size_t nvsize = 0; 7402 dmu_buf_t *db; 7403 7404 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 7405 7406 /* 7407 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 7408 * information. This avoids the dmu_buf_will_dirty() path and 7409 * saves us a pre-read to get data we don't actually care about. 7410 */ 7411 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 7412 packed = kmem_alloc(bufsize, KM_SLEEP); 7413 7414 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 7415 KM_SLEEP) == 0); 7416 bzero(packed + nvsize, bufsize - nvsize); 7417 7418 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 7419 7420 kmem_free(packed, bufsize); 7421 7422 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 7423 dmu_buf_will_dirty(db, tx); 7424 *(uint64_t *)db->db_data = nvsize; 7425 dmu_buf_rele(db, FTAG); 7426} 7427 7428static void 7429spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 7430 const char *config, const char *entry) 7431{ 7432 nvlist_t *nvroot; 7433 nvlist_t **list; 7434 int i; 7435 7436 if (!sav->sav_sync) 7437 return; 7438 7439 /* 7440 * Update the MOS nvlist describing the list of available devices. 7441 * spa_validate_aux() will have already made sure this nvlist is 7442 * valid and the vdevs are labeled appropriately. 7443 */ 7444 if (sav->sav_object == 0) { 7445 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 7446 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 7447 sizeof (uint64_t), tx); 7448 VERIFY(zap_update(spa->spa_meta_objset, 7449 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 7450 &sav->sav_object, tx) == 0); 7451 } 7452 7453 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 7454 if (sav->sav_count == 0) { 7455 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 7456 } else { 7457 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 7458 for (i = 0; i < sav->sav_count; i++) 7459 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 7460 B_FALSE, VDEV_CONFIG_L2CACHE); 7461 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 7462 sav->sav_count) == 0); 7463 for (i = 0; i < sav->sav_count; i++) 7464 nvlist_free(list[i]); 7465 kmem_free(list, sav->sav_count * sizeof (void *)); 7466 } 7467 7468 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 7469 nvlist_free(nvroot); 7470 7471 sav->sav_sync = B_FALSE; 7472} 7473 7474/* 7475 * Rebuild spa's all-vdev ZAP from the vdev ZAPs indicated in each vdev_t. 7476 * The all-vdev ZAP must be empty. 7477 */ 7478static void 7479spa_avz_build(vdev_t *vd, uint64_t avz, dmu_tx_t *tx) 7480{ 7481 spa_t *spa = vd->vdev_spa; 7482 if (vd->vdev_top_zap != 0) { 7483 VERIFY0(zap_add_int(spa->spa_meta_objset, avz, 7484 vd->vdev_top_zap, tx)); 7485 } 7486 if (vd->vdev_leaf_zap != 0) { 7487 VERIFY0(zap_add_int(spa->spa_meta_objset, avz, 7488 vd->vdev_leaf_zap, tx)); 7489 } 7490 for (uint64_t i = 0; i < vd->vdev_children; i++) { 7491 spa_avz_build(vd->vdev_child[i], avz, tx); 7492 } 7493} 7494 7495static void 7496spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 7497{ 7498 nvlist_t *config; 7499 7500 /* 7501 * If the pool is being imported from a pre-per-vdev-ZAP version of ZFS, 7502 * its config may not be dirty but we still need to build per-vdev ZAPs. 7503 * Similarly, if the pool is being assembled (e.g. after a split), we 7504 * need to rebuild the AVZ although the config may not be dirty. 7505 */ 7506 if (list_is_empty(&spa->spa_config_dirty_list) && 7507 spa->spa_avz_action == AVZ_ACTION_NONE) 7508 return; 7509 7510 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 7511 7512 ASSERT(spa->spa_avz_action == AVZ_ACTION_NONE || 7513 spa->spa_avz_action == AVZ_ACTION_INITIALIZE || 7514 spa->spa_all_vdev_zaps != 0); 7515 7516 if (spa->spa_avz_action == AVZ_ACTION_REBUILD) { 7517 /* Make and build the new AVZ */ 7518 uint64_t new_avz = zap_create(spa->spa_meta_objset, 7519 DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx); 7520 spa_avz_build(spa->spa_root_vdev, new_avz, tx); 7521 7522 /* Diff old AVZ with new one */ 7523 zap_cursor_t zc; 7524 zap_attribute_t za; 7525 7526 for (zap_cursor_init(&zc, spa->spa_meta_objset, 7527 spa->spa_all_vdev_zaps); 7528 zap_cursor_retrieve(&zc, &za) == 0; 7529 zap_cursor_advance(&zc)) { 7530 uint64_t vdzap = za.za_first_integer; 7531 if (zap_lookup_int(spa->spa_meta_objset, new_avz, 7532 vdzap) == ENOENT) { 7533 /* 7534 * ZAP is listed in old AVZ but not in new one; 7535 * destroy it 7536 */ 7537 VERIFY0(zap_destroy(spa->spa_meta_objset, vdzap, 7538 tx)); 7539 } 7540 } 7541 7542 zap_cursor_fini(&zc); 7543 7544 /* Destroy the old AVZ */ 7545 VERIFY0(zap_destroy(spa->spa_meta_objset, 7546 spa->spa_all_vdev_zaps, tx)); 7547 7548 /* Replace the old AVZ in the dir obj with the new one */ 7549 VERIFY0(zap_update(spa->spa_meta_objset, 7550 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, 7551 sizeof (new_avz), 1, &new_avz, tx)); 7552 7553 spa->spa_all_vdev_zaps = new_avz; 7554 } else if (spa->spa_avz_action == AVZ_ACTION_DESTROY) { 7555 zap_cursor_t zc; 7556 zap_attribute_t za; 7557 7558 /* Walk through the AVZ and destroy all listed ZAPs */ 7559 for (zap_cursor_init(&zc, spa->spa_meta_objset, 7560 spa->spa_all_vdev_zaps); 7561 zap_cursor_retrieve(&zc, &za) == 0; 7562 zap_cursor_advance(&zc)) { 7563 uint64_t zap = za.za_first_integer; 7564 VERIFY0(zap_destroy(spa->spa_meta_objset, zap, tx)); 7565 } 7566 7567 zap_cursor_fini(&zc); 7568 7569 /* Destroy and unlink the AVZ itself */ 7570 VERIFY0(zap_destroy(spa->spa_meta_objset, 7571 spa->spa_all_vdev_zaps, tx)); 7572 VERIFY0(zap_remove(spa->spa_meta_objset, 7573 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, tx)); 7574 spa->spa_all_vdev_zaps = 0; 7575 } 7576 7577 if (spa->spa_all_vdev_zaps == 0) { 7578 spa->spa_all_vdev_zaps = zap_create_link(spa->spa_meta_objset, 7579 DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT, 7580 DMU_POOL_VDEV_ZAP_MAP, tx); 7581 } 7582 spa->spa_avz_action = AVZ_ACTION_NONE; 7583 7584 /* Create ZAPs for vdevs that don't have them. */ 7585 vdev_construct_zaps(spa->spa_root_vdev, tx); 7586 7587 config = spa_config_generate(spa, spa->spa_root_vdev, 7588 dmu_tx_get_txg(tx), B_FALSE); 7589 7590 /* 7591 * If we're upgrading the spa version then make sure that 7592 * the config object gets updated with the correct version. 7593 */ 7594 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 7595 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 7596 spa->spa_uberblock.ub_version); 7597 7598 spa_config_exit(spa, SCL_STATE, FTAG); 7599 7600 nvlist_free(spa->spa_config_syncing); 7601 spa->spa_config_syncing = config; 7602 7603 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 7604} 7605 7606static void 7607spa_sync_version(void *arg, dmu_tx_t *tx) 7608{ 7609 uint64_t *versionp = arg; 7610 uint64_t version = *versionp; 7611 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 7612 7613 /* 7614 * Setting the version is special cased when first creating the pool. 7615 */ 7616 ASSERT(tx->tx_txg != TXG_INITIAL); 7617 7618 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 7619 ASSERT(version >= spa_version(spa)); 7620 7621 spa->spa_uberblock.ub_version = version; 7622 vdev_config_dirty(spa->spa_root_vdev); 7623 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 7624} 7625 7626/* 7627 * Set zpool properties. 7628 */ 7629static void 7630spa_sync_props(void *arg, dmu_tx_t *tx) 7631{ 7632 nvlist_t *nvp = arg; 7633 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 7634 objset_t *mos = spa->spa_meta_objset; 7635 nvpair_t *elem = NULL; 7636 7637 mutex_enter(&spa->spa_props_lock); 7638 7639 while ((elem = nvlist_next_nvpair(nvp, elem))) { 7640 uint64_t intval; 7641 char *strval, *fname; 7642 zpool_prop_t prop; 7643 const char *propname; 7644 zprop_type_t proptype; 7645 spa_feature_t fid; 7646 7647 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 7648 case ZPOOL_PROP_INVAL: 7649 /* 7650 * We checked this earlier in spa_prop_validate(). 7651 */ 7652 ASSERT(zpool_prop_feature(nvpair_name(elem))); 7653 7654 fname = strchr(nvpair_name(elem), '@') + 1; 7655 VERIFY0(zfeature_lookup_name(fname, &fid)); 7656 7657 spa_feature_enable(spa, fid, tx); 7658 spa_history_log_internal(spa, "set", tx, 7659 "%s=enabled", nvpair_name(elem)); 7660 break; 7661 7662 case ZPOOL_PROP_VERSION: 7663 intval = fnvpair_value_uint64(elem); 7664 /* 7665 * The version is synced seperatly before other 7666 * properties and should be correct by now. 7667 */ 7668 ASSERT3U(spa_version(spa), >=, intval); 7669 break; 7670 7671 case ZPOOL_PROP_ALTROOT: 7672 /* 7673 * 'altroot' is a non-persistent property. It should 7674 * have been set temporarily at creation or import time. 7675 */ 7676 ASSERT(spa->spa_root != NULL); 7677 break; 7678 7679 case ZPOOL_PROP_READONLY: 7680 case ZPOOL_PROP_CACHEFILE: 7681 /* 7682 * 'readonly' and 'cachefile' are also non-persisitent 7683 * properties. 7684 */ 7685 break; 7686 case ZPOOL_PROP_COMMENT: 7687 strval = fnvpair_value_string(elem); 7688 if (spa->spa_comment != NULL) 7689 spa_strfree(spa->spa_comment); 7690 spa->spa_comment = spa_strdup(strval); 7691 /* 7692 * We need to dirty the configuration on all the vdevs 7693 * so that their labels get updated. It's unnecessary 7694 * to do this for pool creation since the vdev's 7695 * configuratoin has already been dirtied. 7696 */ 7697 if (tx->tx_txg != TXG_INITIAL) 7698 vdev_config_dirty(spa->spa_root_vdev); 7699 spa_history_log_internal(spa, "set", tx, 7700 "%s=%s", nvpair_name(elem), strval); 7701 break; 7702 default: 7703 /* 7704 * Set pool property values in the poolprops mos object. 7705 */ 7706 if (spa->spa_pool_props_object == 0) { 7707 spa->spa_pool_props_object = 7708 zap_create_link(mos, DMU_OT_POOL_PROPS, 7709 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 7710 tx); 7711 } 7712 7713 /* normalize the property name */ 7714 propname = zpool_prop_to_name(prop); 7715 proptype = zpool_prop_get_type(prop); 7716 7717 if (nvpair_type(elem) == DATA_TYPE_STRING) { 7718 ASSERT(proptype == PROP_TYPE_STRING); 7719 strval = fnvpair_value_string(elem); 7720 VERIFY0(zap_update(mos, 7721 spa->spa_pool_props_object, propname, 7722 1, strlen(strval) + 1, strval, tx)); 7723 spa_history_log_internal(spa, "set", tx, 7724 "%s=%s", nvpair_name(elem), strval); 7725 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 7726 intval = fnvpair_value_uint64(elem); 7727 7728 if (proptype == PROP_TYPE_INDEX) { 7729 const char *unused; 7730 VERIFY0(zpool_prop_index_to_string( 7731 prop, intval, &unused)); 7732 } 7733 VERIFY0(zap_update(mos, 7734 spa->spa_pool_props_object, propname, 7735 8, 1, &intval, tx)); 7736 spa_history_log_internal(spa, "set", tx, 7737 "%s=%lld", nvpair_name(elem), intval); 7738 } else { 7739 ASSERT(0); /* not allowed */ 7740 } 7741 7742 switch (prop) { 7743 case ZPOOL_PROP_DELEGATION: 7744 spa->spa_delegation = intval; 7745 break; 7746 case ZPOOL_PROP_BOOTFS: 7747 spa->spa_bootfs = intval; 7748 break; 7749 case ZPOOL_PROP_FAILUREMODE: 7750 spa->spa_failmode = intval; 7751 break; 7752 case ZPOOL_PROP_AUTOEXPAND: 7753 spa->spa_autoexpand = intval; 7754 if (tx->tx_txg != TXG_INITIAL) 7755 spa_async_request(spa, 7756 SPA_ASYNC_AUTOEXPAND); 7757 break; 7758 case ZPOOL_PROP_DEDUPDITTO: 7759 spa->spa_dedup_ditto = intval; 7760 break; 7761 default: 7762 break; 7763 } 7764 } 7765 7766 } 7767 7768 mutex_exit(&spa->spa_props_lock); 7769} 7770 7771/* 7772 * Perform one-time upgrade on-disk changes. spa_version() does not 7773 * reflect the new version this txg, so there must be no changes this 7774 * txg to anything that the upgrade code depends on after it executes. 7775 * Therefore this must be called after dsl_pool_sync() does the sync 7776 * tasks. 7777 */ 7778static void 7779spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 7780{ 7781 dsl_pool_t *dp = spa->spa_dsl_pool; 7782 7783 ASSERT(spa->spa_sync_pass == 1); 7784 7785 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 7786 7787 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 7788 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 7789 dsl_pool_create_origin(dp, tx); 7790 7791 /* Keeping the origin open increases spa_minref */ 7792 spa->spa_minref += 3; 7793 } 7794 7795 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 7796 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 7797 dsl_pool_upgrade_clones(dp, tx); 7798 } 7799 7800 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 7801 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 7802 dsl_pool_upgrade_dir_clones(dp, tx); 7803 7804 /* Keeping the freedir open increases spa_minref */ 7805 spa->spa_minref += 3; 7806 } 7807 7808 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 7809 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 7810 spa_feature_create_zap_objects(spa, tx); 7811 } 7812 7813 /* 7814 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 7815 * when possibility to use lz4 compression for metadata was added 7816 * Old pools that have this feature enabled must be upgraded to have 7817 * this feature active 7818 */ 7819 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 7820 boolean_t lz4_en = spa_feature_is_enabled(spa, 7821 SPA_FEATURE_LZ4_COMPRESS); 7822 boolean_t lz4_ac = spa_feature_is_active(spa, 7823 SPA_FEATURE_LZ4_COMPRESS); 7824 7825 if (lz4_en && !lz4_ac) 7826 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 7827 } 7828 7829 /* 7830 * If we haven't written the salt, do so now. Note that the 7831 * feature may not be activated yet, but that's fine since 7832 * the presence of this ZAP entry is backwards compatible. 7833 */ 7834 if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 7835 DMU_POOL_CHECKSUM_SALT) == ENOENT) { 7836 VERIFY0(zap_add(spa->spa_meta_objset, 7837 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, 7838 sizeof (spa->spa_cksum_salt.zcs_bytes), 7839 spa->spa_cksum_salt.zcs_bytes, tx)); 7840 } 7841 7842 rrw_exit(&dp->dp_config_rwlock, FTAG); 7843} 7844 7845static void 7846vdev_indirect_state_sync_verify(vdev_t *vd) 7847{ 7848 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping; 7849 vdev_indirect_births_t *vib = vd->vdev_indirect_births; 7850 7851 if (vd->vdev_ops == &vdev_indirect_ops) { 7852 ASSERT(vim != NULL); 7853 ASSERT(vib != NULL); 7854 } 7855 7856 if (vdev_obsolete_sm_object(vd) != 0) { 7857 ASSERT(vd->vdev_obsolete_sm != NULL); 7858 ASSERT(vd->vdev_removing || 7859 vd->vdev_ops == &vdev_indirect_ops); 7860 ASSERT(vdev_indirect_mapping_num_entries(vim) > 0); 7861 ASSERT(vdev_indirect_mapping_bytes_mapped(vim) > 0); 7862 7863 ASSERT3U(vdev_obsolete_sm_object(vd), ==, 7864 space_map_object(vd->vdev_obsolete_sm)); 7865 ASSERT3U(vdev_indirect_mapping_bytes_mapped(vim), >=, 7866 space_map_allocated(vd->vdev_obsolete_sm)); 7867 } 7868 ASSERT(vd->vdev_obsolete_segments != NULL); 7869 7870 /* 7871 * Since frees / remaps to an indirect vdev can only 7872 * happen in syncing context, the obsolete segments 7873 * tree must be empty when we start syncing. 7874 */ 7875 ASSERT0(range_tree_space(vd->vdev_obsolete_segments)); 7876} 7877 7878/* 7879 * Sync the specified transaction group. New blocks may be dirtied as 7880 * part of the process, so we iterate until it converges. 7881 */ 7882void 7883spa_sync(spa_t *spa, uint64_t txg) 7884{ 7885 dsl_pool_t *dp = spa->spa_dsl_pool; 7886 objset_t *mos = spa->spa_meta_objset; 7887 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 7888 vdev_t *rvd = spa->spa_root_vdev; 7889 vdev_t *vd; 7890 dmu_tx_t *tx; 7891 int error; 7892 uint32_t max_queue_depth = zfs_vdev_async_write_max_active * 7893 zfs_vdev_queue_depth_pct / 100; 7894 7895 VERIFY(spa_writeable(spa)); 7896 7897 /* 7898 * Wait for i/os issued in open context that need to complete 7899 * before this txg syncs. 7900 */ 7901 (void) zio_wait(spa->spa_txg_zio[txg & TXG_MASK]); 7902 spa->spa_txg_zio[txg & TXG_MASK] = zio_root(spa, NULL, NULL, 7903 ZIO_FLAG_CANFAIL); 7904 7905 /* 7906 * Lock out configuration changes. 7907 */ 7908 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 7909 7910 spa->spa_syncing_txg = txg; 7911 spa->spa_sync_pass = 0; 7912 7913 for (int i = 0; i < spa->spa_alloc_count; i++) { 7914 mutex_enter(&spa->spa_alloc_locks[i]); 7915 VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i])); 7916 mutex_exit(&spa->spa_alloc_locks[i]); 7917 } 7918 7919 /* 7920 * If there are any pending vdev state changes, convert them 7921 * into config changes that go out with this transaction group. 7922 */ 7923 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 7924 while (list_head(&spa->spa_state_dirty_list) != NULL) { 7925 /* 7926 * We need the write lock here because, for aux vdevs, 7927 * calling vdev_config_dirty() modifies sav_config. 7928 * This is ugly and will become unnecessary when we 7929 * eliminate the aux vdev wart by integrating all vdevs 7930 * into the root vdev tree. 7931 */ 7932 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 7933 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 7934 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 7935 vdev_state_clean(vd); 7936 vdev_config_dirty(vd); 7937 } 7938 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 7939 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 7940 } 7941 spa_config_exit(spa, SCL_STATE, FTAG); 7942 7943 tx = dmu_tx_create_assigned(dp, txg); 7944 7945 spa->spa_sync_starttime = gethrtime(); 7946#ifdef illumos 7947 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 7948 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 7949#else /* !illumos */ 7950#ifdef _KERNEL 7951 callout_schedule(&spa->spa_deadman_cycid, 7952 hz * spa->spa_deadman_synctime / NANOSEC); 7953#endif 7954#endif /* illumos */ 7955 7956 /* 7957 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 7958 * set spa_deflate if we have no raid-z vdevs. 7959 */ 7960 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 7961 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 7962 int i; 7963 7964 for (i = 0; i < rvd->vdev_children; i++) { 7965 vd = rvd->vdev_child[i]; 7966 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 7967 break; 7968 } 7969 if (i == rvd->vdev_children) { 7970 spa->spa_deflate = TRUE; 7971 VERIFY(0 == zap_add(spa->spa_meta_objset, 7972 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 7973 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 7974 } 7975 } 7976 7977 /* 7978 * Set the top-level vdev's max queue depth. Evaluate each 7979 * top-level's async write queue depth in case it changed. 7980 * The max queue depth will not change in the middle of syncing 7981 * out this txg. 7982 */ 7983 uint64_t slots_per_allocator = 0; 7984 for (int c = 0; c < rvd->vdev_children; c++) { 7985 vdev_t *tvd = rvd->vdev_child[c]; 7986 metaslab_group_t *mg = tvd->vdev_mg; 7987 7988 if (mg == NULL || mg->mg_class != spa_normal_class(spa) || 7989 !metaslab_group_initialized(mg)) 7990 continue; 7991 7992 /* 7993 * It is safe to do a lock-free check here because only async 7994 * allocations look at mg_max_alloc_queue_depth, and async 7995 * allocations all happen from spa_sync(). 7996 */ 7997 for (int i = 0; i < spa->spa_alloc_count; i++) 7998 ASSERT0(refcount_count(&(mg->mg_alloc_queue_depth[i]))); 7999 mg->mg_max_alloc_queue_depth = max_queue_depth; 8000 8001 for (int i = 0; i < spa->spa_alloc_count; i++) { 8002 mg->mg_cur_max_alloc_queue_depth[i] = 8003 zfs_vdev_def_queue_depth; 8004 } 8005 slots_per_allocator += zfs_vdev_def_queue_depth; 8006 } 8007 metaslab_class_t *mc = spa_normal_class(spa); 8008 for (int i = 0; i < spa->spa_alloc_count; i++) { 8009 ASSERT0(refcount_count(&mc->mc_alloc_slots[i])); 8010 mc->mc_alloc_max_slots[i] = slots_per_allocator; 8011 } 8012 mc->mc_alloc_throttle_enabled = zio_dva_throttle_enabled; 8013 8014 for (int c = 0; c < rvd->vdev_children; c++) { 8015 vdev_t *vd = rvd->vdev_child[c]; 8016 vdev_indirect_state_sync_verify(vd); 8017 8018 if (vdev_indirect_should_condense(vd)) { 8019 spa_condense_indirect_start_sync(vd, tx); 8020 break; 8021 } 8022 } 8023 8024 /* 8025 * Iterate to convergence. 8026 */ 8027 do { 8028 int pass = ++spa->spa_sync_pass; 8029 8030 spa_sync_config_object(spa, tx); 8031 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 8032 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 8033 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 8034 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 8035 spa_errlog_sync(spa, txg); 8036 dsl_pool_sync(dp, txg); 8037 8038 if (pass < zfs_sync_pass_deferred_free) { 8039 spa_sync_frees(spa, free_bpl, tx); 8040 } else { 8041 /* 8042 * We can not defer frees in pass 1, because 8043 * we sync the deferred frees later in pass 1. 8044 */ 8045 ASSERT3U(pass, >, 1); 8046 bplist_iterate(free_bpl, bpobj_enqueue_cb, 8047 &spa->spa_deferred_bpobj, tx); 8048 } 8049 8050 ddt_sync(spa, txg); 8051 dsl_scan_sync(dp, tx); 8052 8053 if (spa->spa_vdev_removal != NULL) 8054 svr_sync(spa, tx); 8055 8056 while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 8057 != NULL) 8058 vdev_sync(vd, txg); 8059 8060 if (pass == 1) { 8061 spa_sync_upgrades(spa, tx); 8062 ASSERT3U(txg, >=, 8063 spa->spa_uberblock.ub_rootbp.blk_birth); 8064 /* 8065 * Note: We need to check if the MOS is dirty 8066 * because we could have marked the MOS dirty 8067 * without updating the uberblock (e.g. if we 8068 * have sync tasks but no dirty user data). We 8069 * need to check the uberblock's rootbp because 8070 * it is updated if we have synced out dirty 8071 * data (though in this case the MOS will most 8072 * likely also be dirty due to second order 8073 * effects, we don't want to rely on that here). 8074 */ 8075 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 8076 !dmu_objset_is_dirty(mos, txg)) { 8077 /* 8078 * Nothing changed on the first pass, 8079 * therefore this TXG is a no-op. Avoid 8080 * syncing deferred frees, so that we 8081 * can keep this TXG as a no-op. 8082 */ 8083 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 8084 txg)); 8085 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 8086 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 8087 ASSERT(txg_list_empty(&dp->dp_early_sync_tasks, 8088 txg)); 8089 break; 8090 } 8091 spa_sync_deferred_frees(spa, tx); 8092 } 8093 8094 } while (dmu_objset_is_dirty(mos, txg)); 8095 8096 if (!list_is_empty(&spa->spa_config_dirty_list)) { 8097 /* 8098 * Make sure that the number of ZAPs for all the vdevs matches 8099 * the number of ZAPs in the per-vdev ZAP list. This only gets 8100 * called if the config is dirty; otherwise there may be 8101 * outstanding AVZ operations that weren't completed in 8102 * spa_sync_config_object. 8103 */ 8104 uint64_t all_vdev_zap_entry_count; 8105 ASSERT0(zap_count(spa->spa_meta_objset, 8106 spa->spa_all_vdev_zaps, &all_vdev_zap_entry_count)); 8107 ASSERT3U(vdev_count_verify_zaps(spa->spa_root_vdev), ==, 8108 all_vdev_zap_entry_count); 8109 } 8110 8111 if (spa->spa_vdev_removal != NULL) { 8112 ASSERT0(spa->spa_vdev_removal->svr_bytes_done[txg & TXG_MASK]); 8113 } 8114 8115 /* 8116 * Rewrite the vdev configuration (which includes the uberblock) 8117 * to commit the transaction group. 8118 * 8119 * If there are no dirty vdevs, we sync the uberblock to a few 8120 * random top-level vdevs that are known to be visible in the 8121 * config cache (see spa_vdev_add() for a complete description). 8122 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 8123 */ 8124 for (;;) { 8125 /* 8126 * We hold SCL_STATE to prevent vdev open/close/etc. 8127 * while we're attempting to write the vdev labels. 8128 */ 8129 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 8130 8131 if (list_is_empty(&spa->spa_config_dirty_list)) { 8132 vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL }; 8133 int svdcount = 0; 8134 int children = rvd->vdev_children; 8135 int c0 = spa_get_random(children); 8136 8137 for (int c = 0; c < children; c++) { 8138 vd = rvd->vdev_child[(c0 + c) % children]; 8139 8140 /* Stop when revisiting the first vdev */ 8141 if (c > 0 && svd[0] == vd) 8142 break; 8143 8144 if (vd->vdev_ms_array == 0 || vd->vdev_islog || 8145 !vdev_is_concrete(vd)) 8146 continue; 8147 8148 svd[svdcount++] = vd; 8149 if (svdcount == SPA_SYNC_MIN_VDEVS) 8150 break; 8151 } 8152 error = vdev_config_sync(svd, svdcount, txg); 8153 } else { 8154 error = vdev_config_sync(rvd->vdev_child, 8155 rvd->vdev_children, txg); 8156 } 8157 8158 if (error == 0) 8159 spa->spa_last_synced_guid = rvd->vdev_guid; 8160 8161 spa_config_exit(spa, SCL_STATE, FTAG); 8162 8163 if (error == 0) 8164 break; 8165 zio_suspend(spa, NULL); 8166 zio_resume_wait(spa); 8167 } 8168 dmu_tx_commit(tx); 8169 8170#ifdef illumos 8171 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 8172#else /* !illumos */ 8173#ifdef _KERNEL 8174 callout_drain(&spa->spa_deadman_cycid); 8175#endif 8176#endif /* illumos */ 8177 8178 /* 8179 * Clear the dirty config list. 8180 */ 8181 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 8182 vdev_config_clean(vd); 8183 8184 /* 8185 * Now that the new config has synced transactionally, 8186 * let it become visible to the config cache. 8187 */ 8188 if (spa->spa_config_syncing != NULL) { 8189 spa_config_set(spa, spa->spa_config_syncing); 8190 spa->spa_config_txg = txg; 8191 spa->spa_config_syncing = NULL; 8192 } 8193 8194 dsl_pool_sync_done(dp, txg); 8195 8196 for (int i = 0; i < spa->spa_alloc_count; i++) { 8197 mutex_enter(&spa->spa_alloc_locks[i]); 8198 VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i])); 8199 mutex_exit(&spa->spa_alloc_locks[i]); 8200 } 8201 8202 /* 8203 * Update usable space statistics. 8204 */ 8205 while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 8206 != NULL) 8207 vdev_sync_done(vd, txg); 8208 8209 spa_update_dspace(spa); 8210 8211 /* 8212 * It had better be the case that we didn't dirty anything 8213 * since vdev_config_sync(). 8214 */ 8215 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 8216 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 8217 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 8218 8219 while (zfs_pause_spa_sync) 8220 delay(1); 8221 8222 spa->spa_sync_pass = 0; 8223 8224 /* 8225 * Update the last synced uberblock here. We want to do this at 8226 * the end of spa_sync() so that consumers of spa_last_synced_txg() 8227 * will be guaranteed that all the processing associated with 8228 * that txg has been completed. 8229 */ 8230 spa->spa_ubsync = spa->spa_uberblock; 8231 spa_config_exit(spa, SCL_CONFIG, FTAG); 8232 8233 spa_handle_ignored_writes(spa); 8234 8235 /* 8236 * If any async tasks have been requested, kick them off. 8237 */ 8238 spa_async_dispatch(spa); 8239 spa_async_dispatch_vd(spa); 8240} 8241 8242/* 8243 * Sync all pools. We don't want to hold the namespace lock across these 8244 * operations, so we take a reference on the spa_t and drop the lock during the 8245 * sync. 8246 */ 8247void 8248spa_sync_allpools(void) 8249{ 8250 spa_t *spa = NULL; 8251 mutex_enter(&spa_namespace_lock); 8252 while ((spa = spa_next(spa)) != NULL) { 8253 if (spa_state(spa) != POOL_STATE_ACTIVE || 8254 !spa_writeable(spa) || spa_suspended(spa)) 8255 continue; 8256 spa_open_ref(spa, FTAG); 8257 mutex_exit(&spa_namespace_lock); 8258 txg_wait_synced(spa_get_dsl(spa), 0); 8259 mutex_enter(&spa_namespace_lock); 8260 spa_close(spa, FTAG); 8261 } 8262 mutex_exit(&spa_namespace_lock); 8263} 8264 8265/* 8266 * ========================================================================== 8267 * Miscellaneous routines 8268 * ========================================================================== 8269 */ 8270 8271/* 8272 * Remove all pools in the system. 8273 */ 8274void 8275spa_evict_all(void) 8276{ 8277 spa_t *spa; 8278 8279 /* 8280 * Remove all cached state. All pools should be closed now, 8281 * so every spa in the AVL tree should be unreferenced. 8282 */ 8283 mutex_enter(&spa_namespace_lock); 8284 while ((spa = spa_next(NULL)) != NULL) { 8285 /* 8286 * Stop async tasks. The async thread may need to detach 8287 * a device that's been replaced, which requires grabbing 8288 * spa_namespace_lock, so we must drop it here. 8289 */ 8290 spa_open_ref(spa, FTAG); 8291 mutex_exit(&spa_namespace_lock); 8292 spa_async_suspend(spa); 8293 mutex_enter(&spa_namespace_lock); 8294 spa_close(spa, FTAG); 8295 8296 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 8297 spa_unload(spa); 8298 spa_deactivate(spa); 8299 } 8300 spa_remove(spa); 8301 } 8302 mutex_exit(&spa_namespace_lock); 8303} 8304 8305vdev_t * 8306spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 8307{ 8308 vdev_t *vd; 8309 int i; 8310 8311 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 8312 return (vd); 8313 8314 if (aux) { 8315 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 8316 vd = spa->spa_l2cache.sav_vdevs[i]; 8317 if (vd->vdev_guid == guid) 8318 return (vd); 8319 } 8320 8321 for (i = 0; i < spa->spa_spares.sav_count; i++) { 8322 vd = spa->spa_spares.sav_vdevs[i]; 8323 if (vd->vdev_guid == guid) 8324 return (vd); 8325 } 8326 } 8327 8328 return (NULL); 8329} 8330 8331void 8332spa_upgrade(spa_t *spa, uint64_t version) 8333{ 8334 ASSERT(spa_writeable(spa)); 8335 8336 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 8337 8338 /* 8339 * This should only be called for a non-faulted pool, and since a 8340 * future version would result in an unopenable pool, this shouldn't be 8341 * possible. 8342 */ 8343 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 8344 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 8345 8346 spa->spa_uberblock.ub_version = version; 8347 vdev_config_dirty(spa->spa_root_vdev); 8348 8349 spa_config_exit(spa, SCL_ALL, FTAG); 8350 8351 txg_wait_synced(spa_get_dsl(spa), 0); 8352} 8353 8354boolean_t 8355spa_has_spare(spa_t *spa, uint64_t guid) 8356{ 8357 int i; 8358 uint64_t spareguid; 8359 spa_aux_vdev_t *sav = &spa->spa_spares; 8360 8361 for (i = 0; i < sav->sav_count; i++) 8362 if (sav->sav_vdevs[i]->vdev_guid == guid) 8363 return (B_TRUE); 8364 8365 for (i = 0; i < sav->sav_npending; i++) { 8366 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 8367 &spareguid) == 0 && spareguid == guid) 8368 return (B_TRUE); 8369 } 8370 8371 return (B_FALSE); 8372} 8373 8374/* 8375 * Check if a pool has an active shared spare device. 8376 * Note: reference count of an active spare is 2, as a spare and as a replace 8377 */ 8378static boolean_t 8379spa_has_active_shared_spare(spa_t *spa) 8380{ 8381 int i, refcnt; 8382 uint64_t pool; 8383 spa_aux_vdev_t *sav = &spa->spa_spares; 8384 8385 for (i = 0; i < sav->sav_count; i++) { 8386 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 8387 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 8388 refcnt > 2) 8389 return (B_TRUE); 8390 } 8391 8392 return (B_FALSE); 8393} 8394 8395sysevent_t * 8396spa_event_create(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, const char *name) 8397{ 8398 sysevent_t *ev = NULL; 8399#ifdef _KERNEL 8400 sysevent_attr_list_t *attr = NULL; 8401 sysevent_value_t value; 8402 8403 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 8404 SE_SLEEP); 8405 ASSERT(ev != NULL); 8406 8407 value.value_type = SE_DATA_TYPE_STRING; 8408 value.value.sv_string = spa_name(spa); 8409 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0) 8410 goto done; 8411 8412 value.value_type = SE_DATA_TYPE_UINT64; 8413 value.value.sv_uint64 = spa_guid(spa); 8414 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0) 8415 goto done; 8416 8417 if (vd) { 8418 value.value_type = SE_DATA_TYPE_UINT64; 8419 value.value.sv_uint64 = vd->vdev_guid; 8420 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value, 8421 SE_SLEEP) != 0) 8422 goto done; 8423 8424 if (vd->vdev_path) { 8425 value.value_type = SE_DATA_TYPE_STRING; 8426 value.value.sv_string = vd->vdev_path; 8427 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH, 8428 &value, SE_SLEEP) != 0) 8429 goto done; 8430 } 8431 } 8432 8433 if (hist_nvl != NULL) { 8434 fnvlist_merge((nvlist_t *)attr, hist_nvl); 8435 } 8436 8437 if (sysevent_attach_attributes(ev, attr) != 0) 8438 goto done; 8439 attr = NULL; 8440 8441done: 8442 if (attr) 8443 sysevent_free_attr(attr); 8444 8445#endif 8446 return (ev); 8447} 8448 8449void 8450spa_event_post(sysevent_t *ev) 8451{ 8452#ifdef _KERNEL 8453 sysevent_id_t eid; 8454 8455 (void) log_sysevent(ev, SE_SLEEP, &eid); 8456 sysevent_free(ev); 8457#endif 8458} 8459 8460void 8461spa_event_discard(sysevent_t *ev) 8462{ 8463#ifdef _KERNEL 8464 sysevent_free(ev); 8465#endif 8466} 8467 8468/* 8469 * Post a sysevent corresponding to the given event. The 'name' must be one of 8470 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 8471 * filled in from the spa and (optionally) the vdev and history nvl. This 8472 * doesn't do anything in the userland libzpool, as we don't want consumers to 8473 * misinterpret ztest or zdb as real changes. 8474 */ 8475void 8476spa_event_notify(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, const char *name) 8477{ 8478 spa_event_post(spa_event_create(spa, vd, hist_nvl, name)); 8479} 8480