spa.c revision 288558
1158115Sume/* 2158115Sume * CDDL HEADER START 3158115Sume * 4158115Sume * The contents of this file are subject to the terms of the 5158115Sume * Common Development and Distribution License (the "License"). 6158115Sume * You may not use this file except in compliance with the License. 7158115Sume * 8158115Sume * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9158115Sume * or http://www.opensolaris.org/os/licensing. 10158115Sume * See the License for the specific language governing permissions 11158115Sume * and limitations under the License. 12158115Sume * 13158115Sume * When distributing Covered Code, include this CDDL HEADER in each 14158115Sume * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15158115Sume * If applicable, add the following below this CDDL HEADER, with the 16158115Sume * fields enclosed by brackets "[]" replaced with your own identifying 17158115Sume * information: Portions Copyright [yyyy] [name of copyright owner] 18158115Sume * 19158115Sume * CDDL HEADER END 20158115Sume */ 21158115Sume 22158115Sume/* 23158115Sume * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24158115Sume * Copyright (c) 2013 by Delphix. All rights reserved. 25158115Sume * Copyright (c) 2013, 2014, Nexenta Systems, Inc. All rights reserved. 26158115Sume * Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27158115Sume * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28158115Sume */ 29171795Sbushman 30171795Sbushman/* 31158115Sume * SPA: Storage Pool Allocator 32158115Sume * 33158115Sume * This file contains all the routines used when modifying on-disk SPA state. 34158115Sume * This includes opening, importing, destroying, exporting a pool, and syncing a 35158115Sume * pool. 36158115Sume */ 37158115Sume 38158115Sume#include <sys/zfs_context.h> 39158115Sume#include <sys/fm/fs/zfs.h> 40158115Sume#include <sys/spa_impl.h> 41158115Sume#include <sys/zio.h> 42194112Sdes#include <sys/zio_checksum.h> 43158115Sume#include <sys/dmu.h> 44158115Sume#include <sys/dmu_tx.h> 45158115Sume#include <sys/zap.h> 46158115Sume#include <sys/zil.h> 47158115Sume#include <sys/ddt.h> 48158115Sume#include <sys/vdev_impl.h> 49158115Sume#include <sys/metaslab.h> 50158115Sume#include <sys/metaslab_impl.h> 51158115Sume#include <sys/uberblock_impl.h> 52158115Sume#include <sys/txg.h> 53158115Sume#include <sys/avl.h> 54158115Sume#include <sys/dmu_traverse.h> 55158115Sume#include <sys/dmu_objset.h> 56158115Sume#include <sys/unique.h> 57194112Sdes#include <sys/dsl_pool.h> 58194087Sdes#include <sys/dsl_dataset.h> 59158115Sume#include <sys/dsl_dir.h> 60158115Sume#include <sys/dsl_prop.h> 61158115Sume#include <sys/dsl_synctask.h> 62158115Sume#include <sys/fs/zfs.h> 63158115Sume#include <sys/arc.h> 64158115Sume#include <sys/callb.h> 65158115Sume#include <sys/spa_boot.h> 66158115Sume#include <sys/zfs_ioctl.h> 67158115Sume#include <sys/dsl_scan.h> 68158115Sume#include <sys/dmu_send.h> 69158115Sume#include <sys/dsl_destroy.h> 70158115Sume#include <sys/dsl_userhold.h> 71158115Sume#include <sys/zfeature.h> 72158115Sume#include <sys/zvol.h> 73158115Sume#include <sys/trim_map.h> 74158115Sume 75158115Sume#ifdef _KERNEL 76158115Sume#include <sys/callb.h> 77158115Sume#include <sys/cpupart.h> 78158115Sume#include <sys/zone.h> 79158115Sume#endif /* _KERNEL */ 80158115Sume 81194112Sdes#include "zfs_prop.h" 82158115Sume#include "zfs_comutil.h" 83158115Sume 84158115Sume/* Check hostid on import? */ 85158115Sumestatic int check_hostid = 1; 86158115Sume 87158115SumeSYSCTL_DECL(_vfs_zfs); 88158115SumeTUNABLE_INT("vfs.zfs.check_hostid", &check_hostid); 89158115SumeSYSCTL_INT(_vfs_zfs, OID_AUTO, check_hostid, CTLFLAG_RW, &check_hostid, 0, 90158115Sume "Check hostid on import?"); 91158115Sume 92158115Sume/* 93194112Sdes * The interval, in seconds, at which failed configuration cache file writes 94158115Sume * should be retried. 95158115Sume */ 96158115Sumestatic int zfs_ccw_retry_interval = 300; 97158115Sume 98158115Sumetypedef enum zti_modes { 99158115Sume ZTI_MODE_FIXED, /* value is # of threads (min 1) */ 100158115Sume ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ 101194112Sdes ZTI_MODE_NULL, /* don't create a taskq */ 102158115Sume ZTI_NMODES 103158115Sume} zti_modes_t; 104158115Sume 105158115Sume#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } 106158115Sume#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } 107158115Sume#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } 108158115Sume 109194112Sdes#define ZTI_N(n) ZTI_P(n, 1) 110158115Sume#define ZTI_ONE ZTI_N(1) 111158115Sume 112158115Sumetypedef struct zio_taskq_info { 113158115Sume zti_modes_t zti_mode; 114158115Sume uint_t zti_value; 115158115Sume uint_t zti_count; 116158115Sume} zio_taskq_info_t; 117158115Sume 118194112Sdesstatic const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { 119194112Sdes "issue", "issue_high", "intr", "intr_high" 120158115Sume}; 121158115Sume 122194112Sdes/* 123194112Sdes * This table defines the taskq settings for each ZFS I/O type. When 124158115Sume * initializing a pool, we use this table to create an appropriately sized 125158115Sume * taskq. Some operations are low volume and therefore have a small, static 126194112Sdes * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE 127194112Sdes * macros. Other operations process a large amount of data; the ZTI_BATCH 128158115Sume * macro causes us to create a taskq oriented for throughput. Some operations 129158115Sume * are so high frequency and short-lived that the taskq itself can become a a 130 * point of lock contention. The ZTI_P(#, #) macro indicates that we need an 131 * additional degree of parallelism specified by the number of threads per- 132 * taskq and the number of taskqs; when dispatching an event in this case, the 133 * particular taskq is chosen at random. 134 * 135 * The different taskq priorities are to handle the different contexts (issue 136 * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that 137 * need to be handled with minimum delay. 138 */ 139const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { 140 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ 141 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ 142 { ZTI_N(8), ZTI_NULL, ZTI_BATCH, ZTI_NULL }, /* READ */ 143 { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ 144 { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ 145 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ 146 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ 147}; 148 149static void spa_sync_version(void *arg, dmu_tx_t *tx); 150static void spa_sync_props(void *arg, dmu_tx_t *tx); 151static boolean_t spa_has_active_shared_spare(spa_t *spa); 152static int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config, 153 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 154 char **ereport); 155static void spa_vdev_resilver_done(spa_t *spa); 156 157uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 158#ifdef PSRSET_BIND 159id_t zio_taskq_psrset_bind = PS_NONE; 160#endif 161#ifdef SYSDC 162boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 163#endif 164uint_t zio_taskq_basedc = 80; /* base duty cycle */ 165 166boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 167extern int zfs_sync_pass_deferred_free; 168 169#ifndef illumos 170extern void spa_deadman(void *arg); 171#endif 172 173/* 174 * This (illegal) pool name is used when temporarily importing a spa_t in order 175 * to get the vdev stats associated with the imported devices. 176 */ 177#define TRYIMPORT_NAME "$import" 178 179/* 180 * ========================================================================== 181 * SPA properties routines 182 * ========================================================================== 183 */ 184 185/* 186 * Add a (source=src, propname=propval) list to an nvlist. 187 */ 188static void 189spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 190 uint64_t intval, zprop_source_t src) 191{ 192 const char *propname = zpool_prop_to_name(prop); 193 nvlist_t *propval; 194 195 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 196 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 197 198 if (strval != NULL) 199 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 200 else 201 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 202 203 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 204 nvlist_free(propval); 205} 206 207/* 208 * Get property values from the spa configuration. 209 */ 210static void 211spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 212{ 213 vdev_t *rvd = spa->spa_root_vdev; 214 dsl_pool_t *pool = spa->spa_dsl_pool; 215 uint64_t size, alloc, cap, version; 216 zprop_source_t src = ZPROP_SRC_NONE; 217 spa_config_dirent_t *dp; 218 metaslab_class_t *mc = spa_normal_class(spa); 219 220 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 221 222 if (rvd != NULL) { 223 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 224 size = metaslab_class_get_space(spa_normal_class(spa)); 225 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 226 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 227 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 228 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 229 size - alloc, src); 230 231 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 232 metaslab_class_fragmentation(mc), src); 233 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 234 metaslab_class_expandable_space(mc), src); 235 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 236 (spa_mode(spa) == FREAD), src); 237 238 cap = (size == 0) ? 0 : (alloc * 100 / size); 239 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 240 241 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 242 ddt_get_pool_dedup_ratio(spa), src); 243 244 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 245 rvd->vdev_state, src); 246 247 version = spa_version(spa); 248 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 249 src = ZPROP_SRC_DEFAULT; 250 else 251 src = ZPROP_SRC_LOCAL; 252 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 253 } 254 255 if (pool != NULL) { 256 /* 257 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 258 * when opening pools before this version freedir will be NULL. 259 */ 260 if (pool->dp_free_dir != NULL) { 261 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 262 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 263 src); 264 } else { 265 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 266 NULL, 0, src); 267 } 268 269 if (pool->dp_leak_dir != NULL) { 270 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 271 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 272 src); 273 } else { 274 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 275 NULL, 0, src); 276 } 277 } 278 279 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 280 281 if (spa->spa_comment != NULL) { 282 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 283 0, ZPROP_SRC_LOCAL); 284 } 285 286 if (spa->spa_root != NULL) 287 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 288 0, ZPROP_SRC_LOCAL); 289 290 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 291 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 292 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 293 } else { 294 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 295 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 296 } 297 298 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 299 if (dp->scd_path == NULL) { 300 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 301 "none", 0, ZPROP_SRC_LOCAL); 302 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 303 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 304 dp->scd_path, 0, ZPROP_SRC_LOCAL); 305 } 306 } 307} 308 309/* 310 * Get zpool property values. 311 */ 312int 313spa_prop_get(spa_t *spa, nvlist_t **nvp) 314{ 315 objset_t *mos = spa->spa_meta_objset; 316 zap_cursor_t zc; 317 zap_attribute_t za; 318 int err; 319 320 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 321 322 mutex_enter(&spa->spa_props_lock); 323 324 /* 325 * Get properties from the spa config. 326 */ 327 spa_prop_get_config(spa, nvp); 328 329 /* If no pool property object, no more prop to get. */ 330 if (mos == NULL || spa->spa_pool_props_object == 0) { 331 mutex_exit(&spa->spa_props_lock); 332 return (0); 333 } 334 335 /* 336 * Get properties from the MOS pool property object. 337 */ 338 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 339 (err = zap_cursor_retrieve(&zc, &za)) == 0; 340 zap_cursor_advance(&zc)) { 341 uint64_t intval = 0; 342 char *strval = NULL; 343 zprop_source_t src = ZPROP_SRC_DEFAULT; 344 zpool_prop_t prop; 345 346 if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL) 347 continue; 348 349 switch (za.za_integer_length) { 350 case 8: 351 /* integer property */ 352 if (za.za_first_integer != 353 zpool_prop_default_numeric(prop)) 354 src = ZPROP_SRC_LOCAL; 355 356 if (prop == ZPOOL_PROP_BOOTFS) { 357 dsl_pool_t *dp; 358 dsl_dataset_t *ds = NULL; 359 360 dp = spa_get_dsl(spa); 361 dsl_pool_config_enter(dp, FTAG); 362 if (err = dsl_dataset_hold_obj(dp, 363 za.za_first_integer, FTAG, &ds)) { 364 dsl_pool_config_exit(dp, FTAG); 365 break; 366 } 367 368 strval = kmem_alloc( 369 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1, 370 KM_SLEEP); 371 dsl_dataset_name(ds, strval); 372 dsl_dataset_rele(ds, FTAG); 373 dsl_pool_config_exit(dp, FTAG); 374 } else { 375 strval = NULL; 376 intval = za.za_first_integer; 377 } 378 379 spa_prop_add_list(*nvp, prop, strval, intval, src); 380 381 if (strval != NULL) 382 kmem_free(strval, 383 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1); 384 385 break; 386 387 case 1: 388 /* string property */ 389 strval = kmem_alloc(za.za_num_integers, KM_SLEEP); 390 err = zap_lookup(mos, spa->spa_pool_props_object, 391 za.za_name, 1, za.za_num_integers, strval); 392 if (err) { 393 kmem_free(strval, za.za_num_integers); 394 break; 395 } 396 spa_prop_add_list(*nvp, prop, strval, 0, src); 397 kmem_free(strval, za.za_num_integers); 398 break; 399 400 default: 401 break; 402 } 403 } 404 zap_cursor_fini(&zc); 405 mutex_exit(&spa->spa_props_lock); 406out: 407 if (err && err != ENOENT) { 408 nvlist_free(*nvp); 409 *nvp = NULL; 410 return (err); 411 } 412 413 return (0); 414} 415 416/* 417 * Validate the given pool properties nvlist and modify the list 418 * for the property values to be set. 419 */ 420static int 421spa_prop_validate(spa_t *spa, nvlist_t *props) 422{ 423 nvpair_t *elem; 424 int error = 0, reset_bootfs = 0; 425 uint64_t objnum = 0; 426 boolean_t has_feature = B_FALSE; 427 428 elem = NULL; 429 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { 430 uint64_t intval; 431 char *strval, *slash, *check, *fname; 432 const char *propname = nvpair_name(elem); 433 zpool_prop_t prop = zpool_name_to_prop(propname); 434 435 switch (prop) { 436 case ZPROP_INVAL: 437 if (!zpool_prop_feature(propname)) { 438 error = SET_ERROR(EINVAL); 439 break; 440 } 441 442 /* 443 * Sanitize the input. 444 */ 445 if (nvpair_type(elem) != DATA_TYPE_UINT64) { 446 error = SET_ERROR(EINVAL); 447 break; 448 } 449 450 if (nvpair_value_uint64(elem, &intval) != 0) { 451 error = SET_ERROR(EINVAL); 452 break; 453 } 454 455 if (intval != 0) { 456 error = SET_ERROR(EINVAL); 457 break; 458 } 459 460 fname = strchr(propname, '@') + 1; 461 if (zfeature_lookup_name(fname, NULL) != 0) { 462 error = SET_ERROR(EINVAL); 463 break; 464 } 465 466 has_feature = B_TRUE; 467 break; 468 469 case ZPOOL_PROP_VERSION: 470 error = nvpair_value_uint64(elem, &intval); 471 if (!error && 472 (intval < spa_version(spa) || 473 intval > SPA_VERSION_BEFORE_FEATURES || 474 has_feature)) 475 error = SET_ERROR(EINVAL); 476 break; 477 478 case ZPOOL_PROP_DELEGATION: 479 case ZPOOL_PROP_AUTOREPLACE: 480 case ZPOOL_PROP_LISTSNAPS: 481 case ZPOOL_PROP_AUTOEXPAND: 482 error = nvpair_value_uint64(elem, &intval); 483 if (!error && intval > 1) 484 error = SET_ERROR(EINVAL); 485 break; 486 487 case ZPOOL_PROP_BOOTFS: 488 /* 489 * If the pool version is less than SPA_VERSION_BOOTFS, 490 * or the pool is still being created (version == 0), 491 * the bootfs property cannot be set. 492 */ 493 if (spa_version(spa) < SPA_VERSION_BOOTFS) { 494 error = SET_ERROR(ENOTSUP); 495 break; 496 } 497 498 /* 499 * Make sure the vdev config is bootable 500 */ 501 if (!vdev_is_bootable(spa->spa_root_vdev)) { 502 error = SET_ERROR(ENOTSUP); 503 break; 504 } 505 506 reset_bootfs = 1; 507 508 error = nvpair_value_string(elem, &strval); 509 510 if (!error) { 511 objset_t *os; 512 uint64_t propval; 513 514 if (strval == NULL || strval[0] == '\0') { 515 objnum = zpool_prop_default_numeric( 516 ZPOOL_PROP_BOOTFS); 517 break; 518 } 519 520 if (error = dmu_objset_hold(strval, FTAG, &os)) 521 break; 522 523 /* 524 * Must be ZPL, and its property settings 525 * must be supported by GRUB (compression 526 * is not gzip, and large blocks are not used). 527 */ 528 529 if (dmu_objset_type(os) != DMU_OST_ZFS) { 530 error = SET_ERROR(ENOTSUP); 531 } else if ((error = 532 dsl_prop_get_int_ds(dmu_objset_ds(os), 533 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 534 &propval)) == 0 && 535 !BOOTFS_COMPRESS_VALID(propval)) { 536 error = SET_ERROR(ENOTSUP); 537 } else if ((error = 538 dsl_prop_get_int_ds(dmu_objset_ds(os), 539 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 540 &propval)) == 0 && 541 propval > SPA_OLD_MAXBLOCKSIZE) { 542 error = SET_ERROR(ENOTSUP); 543 } else { 544 objnum = dmu_objset_id(os); 545 } 546 dmu_objset_rele(os, FTAG); 547 } 548 break; 549 550 case ZPOOL_PROP_FAILUREMODE: 551 error = nvpair_value_uint64(elem, &intval); 552 if (!error && (intval < ZIO_FAILURE_MODE_WAIT || 553 intval > ZIO_FAILURE_MODE_PANIC)) 554 error = SET_ERROR(EINVAL); 555 556 /* 557 * This is a special case which only occurs when 558 * the pool has completely failed. This allows 559 * the user to change the in-core failmode property 560 * without syncing it out to disk (I/Os might 561 * currently be blocked). We do this by returning 562 * EIO to the caller (spa_prop_set) to trick it 563 * into thinking we encountered a property validation 564 * error. 565 */ 566 if (!error && spa_suspended(spa)) { 567 spa->spa_failmode = intval; 568 error = SET_ERROR(EIO); 569 } 570 break; 571 572 case ZPOOL_PROP_CACHEFILE: 573 if ((error = nvpair_value_string(elem, &strval)) != 0) 574 break; 575 576 if (strval[0] == '\0') 577 break; 578 579 if (strcmp(strval, "none") == 0) 580 break; 581 582 if (strval[0] != '/') { 583 error = SET_ERROR(EINVAL); 584 break; 585 } 586 587 slash = strrchr(strval, '/'); 588 ASSERT(slash != NULL); 589 590 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || 591 strcmp(slash, "/..") == 0) 592 error = SET_ERROR(EINVAL); 593 break; 594 595 case ZPOOL_PROP_COMMENT: 596 if ((error = nvpair_value_string(elem, &strval)) != 0) 597 break; 598 for (check = strval; *check != '\0'; check++) { 599 /* 600 * The kernel doesn't have an easy isprint() 601 * check. For this kernel check, we merely 602 * check ASCII apart from DEL. Fix this if 603 * there is an easy-to-use kernel isprint(). 604 */ 605 if (*check >= 0x7f) { 606 error = SET_ERROR(EINVAL); 607 break; 608 } 609 check++; 610 } 611 if (strlen(strval) > ZPROP_MAX_COMMENT) 612 error = E2BIG; 613 break; 614 615 case ZPOOL_PROP_DEDUPDITTO: 616 if (spa_version(spa) < SPA_VERSION_DEDUP) 617 error = SET_ERROR(ENOTSUP); 618 else 619 error = nvpair_value_uint64(elem, &intval); 620 if (error == 0 && 621 intval != 0 && intval < ZIO_DEDUPDITTO_MIN) 622 error = SET_ERROR(EINVAL); 623 break; 624 } 625 626 if (error) 627 break; 628 } 629 630 if (!error && reset_bootfs) { 631 error = nvlist_remove(props, 632 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); 633 634 if (!error) { 635 error = nvlist_add_uint64(props, 636 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); 637 } 638 } 639 640 return (error); 641} 642 643void 644spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) 645{ 646 char *cachefile; 647 spa_config_dirent_t *dp; 648 649 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), 650 &cachefile) != 0) 651 return; 652 653 dp = kmem_alloc(sizeof (spa_config_dirent_t), 654 KM_SLEEP); 655 656 if (cachefile[0] == '\0') 657 dp->scd_path = spa_strdup(spa_config_path); 658 else if (strcmp(cachefile, "none") == 0) 659 dp->scd_path = NULL; 660 else 661 dp->scd_path = spa_strdup(cachefile); 662 663 list_insert_head(&spa->spa_config_list, dp); 664 if (need_sync) 665 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 666} 667 668int 669spa_prop_set(spa_t *spa, nvlist_t *nvp) 670{ 671 int error; 672 nvpair_t *elem = NULL; 673 boolean_t need_sync = B_FALSE; 674 675 if ((error = spa_prop_validate(spa, nvp)) != 0) 676 return (error); 677 678 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { 679 zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); 680 681 if (prop == ZPOOL_PROP_CACHEFILE || 682 prop == ZPOOL_PROP_ALTROOT || 683 prop == ZPOOL_PROP_READONLY) 684 continue; 685 686 if (prop == ZPOOL_PROP_VERSION || prop == ZPROP_INVAL) { 687 uint64_t ver; 688 689 if (prop == ZPOOL_PROP_VERSION) { 690 VERIFY(nvpair_value_uint64(elem, &ver) == 0); 691 } else { 692 ASSERT(zpool_prop_feature(nvpair_name(elem))); 693 ver = SPA_VERSION_FEATURES; 694 need_sync = B_TRUE; 695 } 696 697 /* Save time if the version is already set. */ 698 if (ver == spa_version(spa)) 699 continue; 700 701 /* 702 * In addition to the pool directory object, we might 703 * create the pool properties object, the features for 704 * read object, the features for write object, or the 705 * feature descriptions object. 706 */ 707 error = dsl_sync_task(spa->spa_name, NULL, 708 spa_sync_version, &ver, 709 6, ZFS_SPACE_CHECK_RESERVED); 710 if (error) 711 return (error); 712 continue; 713 } 714 715 need_sync = B_TRUE; 716 break; 717 } 718 719 if (need_sync) { 720 return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, 721 nvp, 6, ZFS_SPACE_CHECK_RESERVED)); 722 } 723 724 return (0); 725} 726 727/* 728 * If the bootfs property value is dsobj, clear it. 729 */ 730void 731spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) 732{ 733 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { 734 VERIFY(zap_remove(spa->spa_meta_objset, 735 spa->spa_pool_props_object, 736 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); 737 spa->spa_bootfs = 0; 738 } 739} 740 741/*ARGSUSED*/ 742static int 743spa_change_guid_check(void *arg, dmu_tx_t *tx) 744{ 745 uint64_t *newguid = arg; 746 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 747 vdev_t *rvd = spa->spa_root_vdev; 748 uint64_t vdev_state; 749 750 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 751 vdev_state = rvd->vdev_state; 752 spa_config_exit(spa, SCL_STATE, FTAG); 753 754 if (vdev_state != VDEV_STATE_HEALTHY) 755 return (SET_ERROR(ENXIO)); 756 757 ASSERT3U(spa_guid(spa), !=, *newguid); 758 759 return (0); 760} 761 762static void 763spa_change_guid_sync(void *arg, dmu_tx_t *tx) 764{ 765 uint64_t *newguid = arg; 766 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 767 uint64_t oldguid; 768 vdev_t *rvd = spa->spa_root_vdev; 769 770 oldguid = spa_guid(spa); 771 772 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 773 rvd->vdev_guid = *newguid; 774 rvd->vdev_guid_sum += (*newguid - oldguid); 775 vdev_config_dirty(rvd); 776 spa_config_exit(spa, SCL_STATE, FTAG); 777 778 spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", 779 oldguid, *newguid); 780} 781 782/* 783 * Change the GUID for the pool. This is done so that we can later 784 * re-import a pool built from a clone of our own vdevs. We will modify 785 * the root vdev's guid, our own pool guid, and then mark all of our 786 * vdevs dirty. Note that we must make sure that all our vdevs are 787 * online when we do this, or else any vdevs that weren't present 788 * would be orphaned from our pool. We are also going to issue a 789 * sysevent to update any watchers. 790 */ 791int 792spa_change_guid(spa_t *spa) 793{ 794 int error; 795 uint64_t guid; 796 797 mutex_enter(&spa->spa_vdev_top_lock); 798 mutex_enter(&spa_namespace_lock); 799 guid = spa_generate_guid(NULL); 800 801 error = dsl_sync_task(spa->spa_name, spa_change_guid_check, 802 spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); 803 804 if (error == 0) { 805 spa_config_sync(spa, B_FALSE, B_TRUE); 806 spa_event_notify(spa, NULL, ESC_ZFS_POOL_REGUID); 807 } 808 809 mutex_exit(&spa_namespace_lock); 810 mutex_exit(&spa->spa_vdev_top_lock); 811 812 return (error); 813} 814 815/* 816 * ========================================================================== 817 * SPA state manipulation (open/create/destroy/import/export) 818 * ========================================================================== 819 */ 820 821static int 822spa_error_entry_compare(const void *a, const void *b) 823{ 824 spa_error_entry_t *sa = (spa_error_entry_t *)a; 825 spa_error_entry_t *sb = (spa_error_entry_t *)b; 826 int ret; 827 828 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark, 829 sizeof (zbookmark_phys_t)); 830 831 if (ret < 0) 832 return (-1); 833 else if (ret > 0) 834 return (1); 835 else 836 return (0); 837} 838 839/* 840 * Utility function which retrieves copies of the current logs and 841 * re-initializes them in the process. 842 */ 843void 844spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) 845{ 846 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); 847 848 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); 849 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); 850 851 avl_create(&spa->spa_errlist_scrub, 852 spa_error_entry_compare, sizeof (spa_error_entry_t), 853 offsetof(spa_error_entry_t, se_avl)); 854 avl_create(&spa->spa_errlist_last, 855 spa_error_entry_compare, sizeof (spa_error_entry_t), 856 offsetof(spa_error_entry_t, se_avl)); 857} 858 859static void 860spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 861{ 862 const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; 863 enum zti_modes mode = ztip->zti_mode; 864 uint_t value = ztip->zti_value; 865 uint_t count = ztip->zti_count; 866 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 867 char name[32]; 868 uint_t flags = 0; 869 boolean_t batch = B_FALSE; 870 871 if (mode == ZTI_MODE_NULL) { 872 tqs->stqs_count = 0; 873 tqs->stqs_taskq = NULL; 874 return; 875 } 876 877 ASSERT3U(count, >, 0); 878 879 tqs->stqs_count = count; 880 tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); 881 882 switch (mode) { 883 case ZTI_MODE_FIXED: 884 ASSERT3U(value, >=, 1); 885 value = MAX(value, 1); 886 break; 887 888 case ZTI_MODE_BATCH: 889 batch = B_TRUE; 890 flags |= TASKQ_THREADS_CPU_PCT; 891 value = zio_taskq_batch_pct; 892 break; 893 894 default: 895 panic("unrecognized mode for %s_%s taskq (%u:%u) in " 896 "spa_activate()", 897 zio_type_name[t], zio_taskq_types[q], mode, value); 898 break; 899 } 900 901 for (uint_t i = 0; i < count; i++) { 902 taskq_t *tq; 903 904 if (count > 1) { 905 (void) snprintf(name, sizeof (name), "%s_%s_%u", 906 zio_type_name[t], zio_taskq_types[q], i); 907 } else { 908 (void) snprintf(name, sizeof (name), "%s_%s", 909 zio_type_name[t], zio_taskq_types[q]); 910 } 911 912#ifdef SYSDC 913 if (zio_taskq_sysdc && spa->spa_proc != &p0) { 914 if (batch) 915 flags |= TASKQ_DC_BATCH; 916 917 tq = taskq_create_sysdc(name, value, 50, INT_MAX, 918 spa->spa_proc, zio_taskq_basedc, flags); 919 } else { 920#endif 921 pri_t pri = maxclsyspri; 922 /* 923 * The write issue taskq can be extremely CPU 924 * intensive. Run it at slightly lower priority 925 * than the other taskqs. 926 */ 927 if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) 928 pri--; 929 930 tq = taskq_create_proc(name, value, pri, 50, 931 INT_MAX, spa->spa_proc, flags); 932#ifdef SYSDC 933 } 934#endif 935 936 tqs->stqs_taskq[i] = tq; 937 } 938} 939 940static void 941spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 942{ 943 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 944 945 if (tqs->stqs_taskq == NULL) { 946 ASSERT0(tqs->stqs_count); 947 return; 948 } 949 950 for (uint_t i = 0; i < tqs->stqs_count; i++) { 951 ASSERT3P(tqs->stqs_taskq[i], !=, NULL); 952 taskq_destroy(tqs->stqs_taskq[i]); 953 } 954 955 kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); 956 tqs->stqs_taskq = NULL; 957} 958 959/* 960 * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. 961 * Note that a type may have multiple discrete taskqs to avoid lock contention 962 * on the taskq itself. In that case we choose which taskq at random by using 963 * the low bits of gethrtime(). 964 */ 965void 966spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, 967 task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) 968{ 969 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 970 taskq_t *tq; 971 972 ASSERT3P(tqs->stqs_taskq, !=, NULL); 973 ASSERT3U(tqs->stqs_count, !=, 0); 974 975 if (tqs->stqs_count == 1) { 976 tq = tqs->stqs_taskq[0]; 977 } else { 978#ifdef _KERNEL 979 tq = tqs->stqs_taskq[cpu_ticks() % tqs->stqs_count]; 980#else 981 tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; 982#endif 983 } 984 985 taskq_dispatch_ent(tq, func, arg, flags, ent); 986} 987 988static void 989spa_create_zio_taskqs(spa_t *spa) 990{ 991 for (int t = 0; t < ZIO_TYPES; t++) { 992 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 993 spa_taskqs_init(spa, t, q); 994 } 995 } 996} 997 998#ifdef _KERNEL 999#ifdef SPA_PROCESS 1000static void 1001spa_thread(void *arg) 1002{ 1003 callb_cpr_t cprinfo; 1004 1005 spa_t *spa = arg; 1006 user_t *pu = PTOU(curproc); 1007 1008 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, 1009 spa->spa_name); 1010 1011 ASSERT(curproc != &p0); 1012 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), 1013 "zpool-%s", spa->spa_name); 1014 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); 1015 1016#ifdef PSRSET_BIND 1017 /* bind this thread to the requested psrset */ 1018 if (zio_taskq_psrset_bind != PS_NONE) { 1019 pool_lock(); 1020 mutex_enter(&cpu_lock); 1021 mutex_enter(&pidlock); 1022 mutex_enter(&curproc->p_lock); 1023 1024 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, 1025 0, NULL, NULL) == 0) { 1026 curthread->t_bind_pset = zio_taskq_psrset_bind; 1027 } else { 1028 cmn_err(CE_WARN, 1029 "Couldn't bind process for zfs pool \"%s\" to " 1030 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); 1031 } 1032 1033 mutex_exit(&curproc->p_lock); 1034 mutex_exit(&pidlock); 1035 mutex_exit(&cpu_lock); 1036 pool_unlock(); 1037 } 1038#endif 1039 1040#ifdef SYSDC 1041 if (zio_taskq_sysdc) { 1042 sysdc_thread_enter(curthread, 100, 0); 1043 } 1044#endif 1045 1046 spa->spa_proc = curproc; 1047 spa->spa_did = curthread->t_did; 1048 1049 spa_create_zio_taskqs(spa); 1050 1051 mutex_enter(&spa->spa_proc_lock); 1052 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); 1053 1054 spa->spa_proc_state = SPA_PROC_ACTIVE; 1055 cv_broadcast(&spa->spa_proc_cv); 1056 1057 CALLB_CPR_SAFE_BEGIN(&cprinfo); 1058 while (spa->spa_proc_state == SPA_PROC_ACTIVE) 1059 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1060 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); 1061 1062 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); 1063 spa->spa_proc_state = SPA_PROC_GONE; 1064 spa->spa_proc = &p0; 1065 cv_broadcast(&spa->spa_proc_cv); 1066 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ 1067 1068 mutex_enter(&curproc->p_lock); 1069 lwp_exit(); 1070} 1071#endif /* SPA_PROCESS */ 1072#endif 1073 1074/* 1075 * Activate an uninitialized pool. 1076 */ 1077static void 1078spa_activate(spa_t *spa, int mode) 1079{ 1080 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 1081 1082 spa->spa_state = POOL_STATE_ACTIVE; 1083 spa->spa_mode = mode; 1084 1085 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); 1086 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); 1087 1088 /* Try to create a covering process */ 1089 mutex_enter(&spa->spa_proc_lock); 1090 ASSERT(spa->spa_proc_state == SPA_PROC_NONE); 1091 ASSERT(spa->spa_proc == &p0); 1092 spa->spa_did = 0; 1093 1094#ifdef SPA_PROCESS 1095 /* Only create a process if we're going to be around a while. */ 1096 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { 1097 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, 1098 NULL, 0) == 0) { 1099 spa->spa_proc_state = SPA_PROC_CREATED; 1100 while (spa->spa_proc_state == SPA_PROC_CREATED) { 1101 cv_wait(&spa->spa_proc_cv, 1102 &spa->spa_proc_lock); 1103 } 1104 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1105 ASSERT(spa->spa_proc != &p0); 1106 ASSERT(spa->spa_did != 0); 1107 } else { 1108#ifdef _KERNEL 1109 cmn_err(CE_WARN, 1110 "Couldn't create process for zfs pool \"%s\"\n", 1111 spa->spa_name); 1112#endif 1113 } 1114 } 1115#endif /* SPA_PROCESS */ 1116 mutex_exit(&spa->spa_proc_lock); 1117 1118 /* If we didn't create a process, we need to create our taskqs. */ 1119 ASSERT(spa->spa_proc == &p0); 1120 if (spa->spa_proc == &p0) { 1121 spa_create_zio_taskqs(spa); 1122 } 1123 1124 /* 1125 * Start TRIM thread. 1126 */ 1127 trim_thread_create(spa); 1128 1129 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), 1130 offsetof(vdev_t, vdev_config_dirty_node)); 1131 list_create(&spa->spa_evicting_os_list, sizeof (objset_t), 1132 offsetof(objset_t, os_evicting_node)); 1133 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), 1134 offsetof(vdev_t, vdev_state_dirty_node)); 1135 1136 txg_list_create(&spa->spa_vdev_txg_list, 1137 offsetof(struct vdev, vdev_txg_node)); 1138 1139 avl_create(&spa->spa_errlist_scrub, 1140 spa_error_entry_compare, sizeof (spa_error_entry_t), 1141 offsetof(spa_error_entry_t, se_avl)); 1142 avl_create(&spa->spa_errlist_last, 1143 spa_error_entry_compare, sizeof (spa_error_entry_t), 1144 offsetof(spa_error_entry_t, se_avl)); 1145} 1146 1147/* 1148 * Opposite of spa_activate(). 1149 */ 1150static void 1151spa_deactivate(spa_t *spa) 1152{ 1153 ASSERT(spa->spa_sync_on == B_FALSE); 1154 ASSERT(spa->spa_dsl_pool == NULL); 1155 ASSERT(spa->spa_root_vdev == NULL); 1156 ASSERT(spa->spa_async_zio_root == NULL); 1157 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); 1158 1159 /* 1160 * Stop TRIM thread in case spa_unload() wasn't called directly 1161 * before spa_deactivate(). 1162 */ 1163 trim_thread_destroy(spa); 1164 1165 spa_evicting_os_wait(spa); 1166 1167 txg_list_destroy(&spa->spa_vdev_txg_list); 1168 1169 list_destroy(&spa->spa_config_dirty_list); 1170 list_destroy(&spa->spa_evicting_os_list); 1171 list_destroy(&spa->spa_state_dirty_list); 1172 1173 for (int t = 0; t < ZIO_TYPES; t++) { 1174 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1175 spa_taskqs_fini(spa, t, q); 1176 } 1177 } 1178 1179 metaslab_class_destroy(spa->spa_normal_class); 1180 spa->spa_normal_class = NULL; 1181 1182 metaslab_class_destroy(spa->spa_log_class); 1183 spa->spa_log_class = NULL; 1184 1185 /* 1186 * If this was part of an import or the open otherwise failed, we may 1187 * still have errors left in the queues. Empty them just in case. 1188 */ 1189 spa_errlog_drain(spa); 1190 1191 avl_destroy(&spa->spa_errlist_scrub); 1192 avl_destroy(&spa->spa_errlist_last); 1193 1194 spa->spa_state = POOL_STATE_UNINITIALIZED; 1195 1196 mutex_enter(&spa->spa_proc_lock); 1197 if (spa->spa_proc_state != SPA_PROC_NONE) { 1198 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1199 spa->spa_proc_state = SPA_PROC_DEACTIVATE; 1200 cv_broadcast(&spa->spa_proc_cv); 1201 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { 1202 ASSERT(spa->spa_proc != &p0); 1203 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1204 } 1205 ASSERT(spa->spa_proc_state == SPA_PROC_GONE); 1206 spa->spa_proc_state = SPA_PROC_NONE; 1207 } 1208 ASSERT(spa->spa_proc == &p0); 1209 mutex_exit(&spa->spa_proc_lock); 1210 1211#ifdef SPA_PROCESS 1212 /* 1213 * We want to make sure spa_thread() has actually exited the ZFS 1214 * module, so that the module can't be unloaded out from underneath 1215 * it. 1216 */ 1217 if (spa->spa_did != 0) { 1218 thread_join(spa->spa_did); 1219 spa->spa_did = 0; 1220 } 1221#endif /* SPA_PROCESS */ 1222} 1223 1224/* 1225 * Verify a pool configuration, and construct the vdev tree appropriately. This 1226 * will create all the necessary vdevs in the appropriate layout, with each vdev 1227 * in the CLOSED state. This will prep the pool before open/creation/import. 1228 * All vdev validation is done by the vdev_alloc() routine. 1229 */ 1230static int 1231spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, 1232 uint_t id, int atype) 1233{ 1234 nvlist_t **child; 1235 uint_t children; 1236 int error; 1237 1238 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) 1239 return (error); 1240 1241 if ((*vdp)->vdev_ops->vdev_op_leaf) 1242 return (0); 1243 1244 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1245 &child, &children); 1246 1247 if (error == ENOENT) 1248 return (0); 1249 1250 if (error) { 1251 vdev_free(*vdp); 1252 *vdp = NULL; 1253 return (SET_ERROR(EINVAL)); 1254 } 1255 1256 for (int c = 0; c < children; c++) { 1257 vdev_t *vd; 1258 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, 1259 atype)) != 0) { 1260 vdev_free(*vdp); 1261 *vdp = NULL; 1262 return (error); 1263 } 1264 } 1265 1266 ASSERT(*vdp != NULL); 1267 1268 return (0); 1269} 1270 1271/* 1272 * Opposite of spa_load(). 1273 */ 1274static void 1275spa_unload(spa_t *spa) 1276{ 1277 int i; 1278 1279 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1280 1281 /* 1282 * Stop TRIM thread. 1283 */ 1284 trim_thread_destroy(spa); 1285 1286 /* 1287 * Stop async tasks. 1288 */ 1289 spa_async_suspend(spa); 1290 1291 /* 1292 * Stop syncing. 1293 */ 1294 if (spa->spa_sync_on) { 1295 txg_sync_stop(spa->spa_dsl_pool); 1296 spa->spa_sync_on = B_FALSE; 1297 } 1298 1299 /* 1300 * Wait for any outstanding async I/O to complete. 1301 */ 1302 if (spa->spa_async_zio_root != NULL) { 1303 for (int i = 0; i < max_ncpus; i++) 1304 (void) zio_wait(spa->spa_async_zio_root[i]); 1305 kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); 1306 spa->spa_async_zio_root = NULL; 1307 } 1308 1309 bpobj_close(&spa->spa_deferred_bpobj); 1310 1311 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1312 1313 /* 1314 * Close all vdevs. 1315 */ 1316 if (spa->spa_root_vdev) 1317 vdev_free(spa->spa_root_vdev); 1318 ASSERT(spa->spa_root_vdev == NULL); 1319 1320 /* 1321 * Close the dsl pool. 1322 */ 1323 if (spa->spa_dsl_pool) { 1324 dsl_pool_close(spa->spa_dsl_pool); 1325 spa->spa_dsl_pool = NULL; 1326 spa->spa_meta_objset = NULL; 1327 } 1328 1329 ddt_unload(spa); 1330 1331 1332 /* 1333 * Drop and purge level 2 cache 1334 */ 1335 spa_l2cache_drop(spa); 1336 1337 for (i = 0; i < spa->spa_spares.sav_count; i++) 1338 vdev_free(spa->spa_spares.sav_vdevs[i]); 1339 if (spa->spa_spares.sav_vdevs) { 1340 kmem_free(spa->spa_spares.sav_vdevs, 1341 spa->spa_spares.sav_count * sizeof (void *)); 1342 spa->spa_spares.sav_vdevs = NULL; 1343 } 1344 if (spa->spa_spares.sav_config) { 1345 nvlist_free(spa->spa_spares.sav_config); 1346 spa->spa_spares.sav_config = NULL; 1347 } 1348 spa->spa_spares.sav_count = 0; 1349 1350 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 1351 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); 1352 vdev_free(spa->spa_l2cache.sav_vdevs[i]); 1353 } 1354 if (spa->spa_l2cache.sav_vdevs) { 1355 kmem_free(spa->spa_l2cache.sav_vdevs, 1356 spa->spa_l2cache.sav_count * sizeof (void *)); 1357 spa->spa_l2cache.sav_vdevs = NULL; 1358 } 1359 if (spa->spa_l2cache.sav_config) { 1360 nvlist_free(spa->spa_l2cache.sav_config); 1361 spa->spa_l2cache.sav_config = NULL; 1362 } 1363 spa->spa_l2cache.sav_count = 0; 1364 1365 spa->spa_async_suspended = 0; 1366 1367 if (spa->spa_comment != NULL) { 1368 spa_strfree(spa->spa_comment); 1369 spa->spa_comment = NULL; 1370 } 1371 1372 spa_config_exit(spa, SCL_ALL, FTAG); 1373} 1374 1375/* 1376 * Load (or re-load) the current list of vdevs describing the active spares for 1377 * this pool. When this is called, we have some form of basic information in 1378 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and 1379 * then re-generate a more complete list including status information. 1380 */ 1381static void 1382spa_load_spares(spa_t *spa) 1383{ 1384 nvlist_t **spares; 1385 uint_t nspares; 1386 int i; 1387 vdev_t *vd, *tvd; 1388 1389 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1390 1391 /* 1392 * First, close and free any existing spare vdevs. 1393 */ 1394 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1395 vd = spa->spa_spares.sav_vdevs[i]; 1396 1397 /* Undo the call to spa_activate() below */ 1398 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1399 B_FALSE)) != NULL && tvd->vdev_isspare) 1400 spa_spare_remove(tvd); 1401 vdev_close(vd); 1402 vdev_free(vd); 1403 } 1404 1405 if (spa->spa_spares.sav_vdevs) 1406 kmem_free(spa->spa_spares.sav_vdevs, 1407 spa->spa_spares.sav_count * sizeof (void *)); 1408 1409 if (spa->spa_spares.sav_config == NULL) 1410 nspares = 0; 1411 else 1412 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 1413 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 1414 1415 spa->spa_spares.sav_count = (int)nspares; 1416 spa->spa_spares.sav_vdevs = NULL; 1417 1418 if (nspares == 0) 1419 return; 1420 1421 /* 1422 * Construct the array of vdevs, opening them to get status in the 1423 * process. For each spare, there is potentially two different vdev_t 1424 * structures associated with it: one in the list of spares (used only 1425 * for basic validation purposes) and one in the active vdev 1426 * configuration (if it's spared in). During this phase we open and 1427 * validate each vdev on the spare list. If the vdev also exists in the 1428 * active configuration, then we also mark this vdev as an active spare. 1429 */ 1430 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *), 1431 KM_SLEEP); 1432 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1433 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, 1434 VDEV_ALLOC_SPARE) == 0); 1435 ASSERT(vd != NULL); 1436 1437 spa->spa_spares.sav_vdevs[i] = vd; 1438 1439 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1440 B_FALSE)) != NULL) { 1441 if (!tvd->vdev_isspare) 1442 spa_spare_add(tvd); 1443 1444 /* 1445 * We only mark the spare active if we were successfully 1446 * able to load the vdev. Otherwise, importing a pool 1447 * with a bad active spare would result in strange 1448 * behavior, because multiple pool would think the spare 1449 * is actively in use. 1450 * 1451 * There is a vulnerability here to an equally bizarre 1452 * circumstance, where a dead active spare is later 1453 * brought back to life (onlined or otherwise). Given 1454 * the rarity of this scenario, and the extra complexity 1455 * it adds, we ignore the possibility. 1456 */ 1457 if (!vdev_is_dead(tvd)) 1458 spa_spare_activate(tvd); 1459 } 1460 1461 vd->vdev_top = vd; 1462 vd->vdev_aux = &spa->spa_spares; 1463 1464 if (vdev_open(vd) != 0) 1465 continue; 1466 1467 if (vdev_validate_aux(vd) == 0) 1468 spa_spare_add(vd); 1469 } 1470 1471 /* 1472 * Recompute the stashed list of spares, with status information 1473 * this time. 1474 */ 1475 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, 1476 DATA_TYPE_NVLIST_ARRAY) == 0); 1477 1478 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), 1479 KM_SLEEP); 1480 for (i = 0; i < spa->spa_spares.sav_count; i++) 1481 spares[i] = vdev_config_generate(spa, 1482 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); 1483 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 1484 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); 1485 for (i = 0; i < spa->spa_spares.sav_count; i++) 1486 nvlist_free(spares[i]); 1487 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); 1488} 1489 1490/* 1491 * Load (or re-load) the current list of vdevs describing the active l2cache for 1492 * this pool. When this is called, we have some form of basic information in 1493 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and 1494 * then re-generate a more complete list including status information. 1495 * Devices which are already active have their details maintained, and are 1496 * not re-opened. 1497 */ 1498static void 1499spa_load_l2cache(spa_t *spa) 1500{ 1501 nvlist_t **l2cache; 1502 uint_t nl2cache; 1503 int i, j, oldnvdevs; 1504 uint64_t guid; 1505 vdev_t *vd, **oldvdevs, **newvdevs; 1506 spa_aux_vdev_t *sav = &spa->spa_l2cache; 1507 1508 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1509 1510 if (sav->sav_config != NULL) { 1511 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 1512 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 1513 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); 1514 } else { 1515 nl2cache = 0; 1516 newvdevs = NULL; 1517 } 1518 1519 oldvdevs = sav->sav_vdevs; 1520 oldnvdevs = sav->sav_count; 1521 sav->sav_vdevs = NULL; 1522 sav->sav_count = 0; 1523 1524 /* 1525 * Process new nvlist of vdevs. 1526 */ 1527 for (i = 0; i < nl2cache; i++) { 1528 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, 1529 &guid) == 0); 1530 1531 newvdevs[i] = NULL; 1532 for (j = 0; j < oldnvdevs; j++) { 1533 vd = oldvdevs[j]; 1534 if (vd != NULL && guid == vd->vdev_guid) { 1535 /* 1536 * Retain previous vdev for add/remove ops. 1537 */ 1538 newvdevs[i] = vd; 1539 oldvdevs[j] = NULL; 1540 break; 1541 } 1542 } 1543 1544 if (newvdevs[i] == NULL) { 1545 /* 1546 * Create new vdev 1547 */ 1548 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, 1549 VDEV_ALLOC_L2CACHE) == 0); 1550 ASSERT(vd != NULL); 1551 newvdevs[i] = vd; 1552 1553 /* 1554 * Commit this vdev as an l2cache device, 1555 * even if it fails to open. 1556 */ 1557 spa_l2cache_add(vd); 1558 1559 vd->vdev_top = vd; 1560 vd->vdev_aux = sav; 1561 1562 spa_l2cache_activate(vd); 1563 1564 if (vdev_open(vd) != 0) 1565 continue; 1566 1567 (void) vdev_validate_aux(vd); 1568 1569 if (!vdev_is_dead(vd)) 1570 l2arc_add_vdev(spa, vd); 1571 } 1572 } 1573 1574 /* 1575 * Purge vdevs that were dropped 1576 */ 1577 for (i = 0; i < oldnvdevs; i++) { 1578 uint64_t pool; 1579 1580 vd = oldvdevs[i]; 1581 if (vd != NULL) { 1582 ASSERT(vd->vdev_isl2cache); 1583 1584 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 1585 pool != 0ULL && l2arc_vdev_present(vd)) 1586 l2arc_remove_vdev(vd); 1587 vdev_clear_stats(vd); 1588 vdev_free(vd); 1589 } 1590 } 1591 1592 if (oldvdevs) 1593 kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); 1594 1595 if (sav->sav_config == NULL) 1596 goto out; 1597 1598 sav->sav_vdevs = newvdevs; 1599 sav->sav_count = (int)nl2cache; 1600 1601 /* 1602 * Recompute the stashed list of l2cache devices, with status 1603 * information this time. 1604 */ 1605 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, 1606 DATA_TYPE_NVLIST_ARRAY) == 0); 1607 1608 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 1609 for (i = 0; i < sav->sav_count; i++) 1610 l2cache[i] = vdev_config_generate(spa, 1611 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); 1612 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 1613 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); 1614out: 1615 for (i = 0; i < sav->sav_count; i++) 1616 nvlist_free(l2cache[i]); 1617 if (sav->sav_count) 1618 kmem_free(l2cache, sav->sav_count * sizeof (void *)); 1619} 1620 1621static int 1622load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) 1623{ 1624 dmu_buf_t *db; 1625 char *packed = NULL; 1626 size_t nvsize = 0; 1627 int error; 1628 *value = NULL; 1629 1630 error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); 1631 if (error != 0) 1632 return (error); 1633 nvsize = *(uint64_t *)db->db_data; 1634 dmu_buf_rele(db, FTAG); 1635 1636 packed = kmem_alloc(nvsize, KM_SLEEP); 1637 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, 1638 DMU_READ_PREFETCH); 1639 if (error == 0) 1640 error = nvlist_unpack(packed, nvsize, value, 0); 1641 kmem_free(packed, nvsize); 1642 1643 return (error); 1644} 1645 1646/* 1647 * Checks to see if the given vdev could not be opened, in which case we post a 1648 * sysevent to notify the autoreplace code that the device has been removed. 1649 */ 1650static void 1651spa_check_removed(vdev_t *vd) 1652{ 1653 for (int c = 0; c < vd->vdev_children; c++) 1654 spa_check_removed(vd->vdev_child[c]); 1655 1656 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && 1657 !vd->vdev_ishole) { 1658 zfs_post_autoreplace(vd->vdev_spa, vd); 1659 spa_event_notify(vd->vdev_spa, vd, ESC_ZFS_VDEV_CHECK); 1660 } 1661} 1662 1663/* 1664 * Validate the current config against the MOS config 1665 */ 1666static boolean_t 1667spa_config_valid(spa_t *spa, nvlist_t *config) 1668{ 1669 vdev_t *mrvd, *rvd = spa->spa_root_vdev; 1670 nvlist_t *nv; 1671 1672 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) == 0); 1673 1674 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1675 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); 1676 1677 ASSERT3U(rvd->vdev_children, ==, mrvd->vdev_children); 1678 1679 /* 1680 * If we're doing a normal import, then build up any additional 1681 * diagnostic information about missing devices in this config. 1682 * We'll pass this up to the user for further processing. 1683 */ 1684 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { 1685 nvlist_t **child, *nv; 1686 uint64_t idx = 0; 1687 1688 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **), 1689 KM_SLEEP); 1690 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1691 1692 for (int c = 0; c < rvd->vdev_children; c++) { 1693 vdev_t *tvd = rvd->vdev_child[c]; 1694 vdev_t *mtvd = mrvd->vdev_child[c]; 1695 1696 if (tvd->vdev_ops == &vdev_missing_ops && 1697 mtvd->vdev_ops != &vdev_missing_ops && 1698 mtvd->vdev_islog) 1699 child[idx++] = vdev_config_generate(spa, mtvd, 1700 B_FALSE, 0); 1701 } 1702 1703 if (idx) { 1704 VERIFY(nvlist_add_nvlist_array(nv, 1705 ZPOOL_CONFIG_CHILDREN, child, idx) == 0); 1706 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 1707 ZPOOL_CONFIG_MISSING_DEVICES, nv) == 0); 1708 1709 for (int i = 0; i < idx; i++) 1710 nvlist_free(child[i]); 1711 } 1712 nvlist_free(nv); 1713 kmem_free(child, rvd->vdev_children * sizeof (char **)); 1714 } 1715 1716 /* 1717 * Compare the root vdev tree with the information we have 1718 * from the MOS config (mrvd). Check each top-level vdev 1719 * with the corresponding MOS config top-level (mtvd). 1720 */ 1721 for (int c = 0; c < rvd->vdev_children; c++) { 1722 vdev_t *tvd = rvd->vdev_child[c]; 1723 vdev_t *mtvd = mrvd->vdev_child[c]; 1724 1725 /* 1726 * Resolve any "missing" vdevs in the current configuration. 1727 * If we find that the MOS config has more accurate information 1728 * about the top-level vdev then use that vdev instead. 1729 */ 1730 if (tvd->vdev_ops == &vdev_missing_ops && 1731 mtvd->vdev_ops != &vdev_missing_ops) { 1732 1733 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) 1734 continue; 1735 1736 /* 1737 * Device specific actions. 1738 */ 1739 if (mtvd->vdev_islog) { 1740 spa_set_log_state(spa, SPA_LOG_CLEAR); 1741 } else { 1742 /* 1743 * XXX - once we have 'readonly' pool 1744 * support we should be able to handle 1745 * missing data devices by transitioning 1746 * the pool to readonly. 1747 */ 1748 continue; 1749 } 1750 1751 /* 1752 * Swap the missing vdev with the data we were 1753 * able to obtain from the MOS config. 1754 */ 1755 vdev_remove_child(rvd, tvd); 1756 vdev_remove_child(mrvd, mtvd); 1757 1758 vdev_add_child(rvd, mtvd); 1759 vdev_add_child(mrvd, tvd); 1760 1761 spa_config_exit(spa, SCL_ALL, FTAG); 1762 vdev_load(mtvd); 1763 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1764 1765 vdev_reopen(rvd); 1766 } else if (mtvd->vdev_islog) { 1767 /* 1768 * Load the slog device's state from the MOS config 1769 * since it's possible that the label does not 1770 * contain the most up-to-date information. 1771 */ 1772 vdev_load_log_state(tvd, mtvd); 1773 vdev_reopen(tvd); 1774 } 1775 } 1776 vdev_free(mrvd); 1777 spa_config_exit(spa, SCL_ALL, FTAG); 1778 1779 /* 1780 * Ensure we were able to validate the config. 1781 */ 1782 return (rvd->vdev_guid_sum == spa->spa_uberblock.ub_guid_sum); 1783} 1784 1785/* 1786 * Check for missing log devices 1787 */ 1788static boolean_t 1789spa_check_logs(spa_t *spa) 1790{ 1791 boolean_t rv = B_FALSE; 1792 1793 switch (spa->spa_log_state) { 1794 case SPA_LOG_MISSING: 1795 /* need to recheck in case slog has been restored */ 1796 case SPA_LOG_UNKNOWN: 1797 rv = (dmu_objset_find(spa->spa_name, zil_check_log_chain, 1798 NULL, DS_FIND_CHILDREN) != 0); 1799 if (rv) 1800 spa_set_log_state(spa, SPA_LOG_MISSING); 1801 break; 1802 } 1803 return (rv); 1804} 1805 1806static boolean_t 1807spa_passivate_log(spa_t *spa) 1808{ 1809 vdev_t *rvd = spa->spa_root_vdev; 1810 boolean_t slog_found = B_FALSE; 1811 1812 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1813 1814 if (!spa_has_slogs(spa)) 1815 return (B_FALSE); 1816 1817 for (int c = 0; c < rvd->vdev_children; c++) { 1818 vdev_t *tvd = rvd->vdev_child[c]; 1819 metaslab_group_t *mg = tvd->vdev_mg; 1820 1821 if (tvd->vdev_islog) { 1822 metaslab_group_passivate(mg); 1823 slog_found = B_TRUE; 1824 } 1825 } 1826 1827 return (slog_found); 1828} 1829 1830static void 1831spa_activate_log(spa_t *spa) 1832{ 1833 vdev_t *rvd = spa->spa_root_vdev; 1834 1835 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1836 1837 for (int c = 0; c < rvd->vdev_children; c++) { 1838 vdev_t *tvd = rvd->vdev_child[c]; 1839 metaslab_group_t *mg = tvd->vdev_mg; 1840 1841 if (tvd->vdev_islog) 1842 metaslab_group_activate(mg); 1843 } 1844} 1845 1846int 1847spa_offline_log(spa_t *spa) 1848{ 1849 int error; 1850 1851 error = dmu_objset_find(spa_name(spa), zil_vdev_offline, 1852 NULL, DS_FIND_CHILDREN); 1853 if (error == 0) { 1854 /* 1855 * We successfully offlined the log device, sync out the 1856 * current txg so that the "stubby" block can be removed 1857 * by zil_sync(). 1858 */ 1859 txg_wait_synced(spa->spa_dsl_pool, 0); 1860 } 1861 return (error); 1862} 1863 1864static void 1865spa_aux_check_removed(spa_aux_vdev_t *sav) 1866{ 1867 int i; 1868 1869 for (i = 0; i < sav->sav_count; i++) 1870 spa_check_removed(sav->sav_vdevs[i]); 1871} 1872 1873void 1874spa_claim_notify(zio_t *zio) 1875{ 1876 spa_t *spa = zio->io_spa; 1877 1878 if (zio->io_error) 1879 return; 1880 1881 mutex_enter(&spa->spa_props_lock); /* any mutex will do */ 1882 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) 1883 spa->spa_claim_max_txg = zio->io_bp->blk_birth; 1884 mutex_exit(&spa->spa_props_lock); 1885} 1886 1887typedef struct spa_load_error { 1888 uint64_t sle_meta_count; 1889 uint64_t sle_data_count; 1890} spa_load_error_t; 1891 1892static void 1893spa_load_verify_done(zio_t *zio) 1894{ 1895 blkptr_t *bp = zio->io_bp; 1896 spa_load_error_t *sle = zio->io_private; 1897 dmu_object_type_t type = BP_GET_TYPE(bp); 1898 int error = zio->io_error; 1899 spa_t *spa = zio->io_spa; 1900 1901 if (error) { 1902 if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && 1903 type != DMU_OT_INTENT_LOG) 1904 atomic_inc_64(&sle->sle_meta_count); 1905 else 1906 atomic_inc_64(&sle->sle_data_count); 1907 } 1908 zio_data_buf_free(zio->io_data, zio->io_size); 1909 1910 mutex_enter(&spa->spa_scrub_lock); 1911 spa->spa_scrub_inflight--; 1912 cv_broadcast(&spa->spa_scrub_io_cv); 1913 mutex_exit(&spa->spa_scrub_lock); 1914} 1915 1916/* 1917 * Maximum number of concurrent scrub i/os to create while verifying 1918 * a pool while importing it. 1919 */ 1920int spa_load_verify_maxinflight = 10000; 1921boolean_t spa_load_verify_metadata = B_TRUE; 1922boolean_t spa_load_verify_data = B_TRUE; 1923 1924SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_maxinflight, CTLFLAG_RWTUN, 1925 &spa_load_verify_maxinflight, 0, 1926 "Maximum number of concurrent scrub I/Os to create while verifying a " 1927 "pool while importing it"); 1928 1929SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_metadata, CTLFLAG_RWTUN, 1930 &spa_load_verify_metadata, 0, 1931 "Check metadata on import?"); 1932 1933SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_data, CTLFLAG_RWTUN, 1934 &spa_load_verify_data, 0, 1935 "Check user data on import?"); 1936 1937/*ARGSUSED*/ 1938static int 1939spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1940 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1941{ 1942 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 1943 return (0); 1944 /* 1945 * Note: normally this routine will not be called if 1946 * spa_load_verify_metadata is not set. However, it may be useful 1947 * to manually set the flag after the traversal has begun. 1948 */ 1949 if (!spa_load_verify_metadata) 1950 return (0); 1951 if (BP_GET_BUFC_TYPE(bp) == ARC_BUFC_DATA && !spa_load_verify_data) 1952 return (0); 1953 1954 zio_t *rio = arg; 1955 size_t size = BP_GET_PSIZE(bp); 1956 void *data = zio_data_buf_alloc(size); 1957 1958 mutex_enter(&spa->spa_scrub_lock); 1959 while (spa->spa_scrub_inflight >= spa_load_verify_maxinflight) 1960 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 1961 spa->spa_scrub_inflight++; 1962 mutex_exit(&spa->spa_scrub_lock); 1963 1964 zio_nowait(zio_read(rio, spa, bp, data, size, 1965 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, 1966 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | 1967 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); 1968 return (0); 1969} 1970 1971static int 1972spa_load_verify(spa_t *spa) 1973{ 1974 zio_t *rio; 1975 spa_load_error_t sle = { 0 }; 1976 zpool_rewind_policy_t policy; 1977 boolean_t verify_ok = B_FALSE; 1978 int error = 0; 1979 1980 zpool_get_rewind_policy(spa->spa_config, &policy); 1981 1982 if (policy.zrp_request & ZPOOL_NEVER_REWIND) 1983 return (0); 1984 1985 rio = zio_root(spa, NULL, &sle, 1986 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 1987 1988 if (spa_load_verify_metadata) { 1989 error = traverse_pool(spa, spa->spa_verify_min_txg, 1990 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 1991 spa_load_verify_cb, rio); 1992 } 1993 1994 (void) zio_wait(rio); 1995 1996 spa->spa_load_meta_errors = sle.sle_meta_count; 1997 spa->spa_load_data_errors = sle.sle_data_count; 1998 1999 if (!error && sle.sle_meta_count <= policy.zrp_maxmeta && 2000 sle.sle_data_count <= policy.zrp_maxdata) { 2001 int64_t loss = 0; 2002 2003 verify_ok = B_TRUE; 2004 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 2005 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 2006 2007 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 2008 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2009 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 2010 VERIFY(nvlist_add_int64(spa->spa_load_info, 2011 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 2012 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2013 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 2014 } else { 2015 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 2016 } 2017 2018 if (error) { 2019 if (error != ENXIO && error != EIO) 2020 error = SET_ERROR(EIO); 2021 return (error); 2022 } 2023 2024 return (verify_ok ? 0 : EIO); 2025} 2026 2027/* 2028 * Find a value in the pool props object. 2029 */ 2030static void 2031spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2032{ 2033 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2034 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2035} 2036 2037/* 2038 * Find a value in the pool directory object. 2039 */ 2040static int 2041spa_dir_prop(spa_t *spa, const char *name, uint64_t *val) 2042{ 2043 return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2044 name, sizeof (uint64_t), 1, val)); 2045} 2046 2047static int 2048spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2049{ 2050 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2051 return (err); 2052} 2053 2054/* 2055 * Fix up config after a partly-completed split. This is done with the 2056 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2057 * pool have that entry in their config, but only the splitting one contains 2058 * a list of all the guids of the vdevs that are being split off. 2059 * 2060 * This function determines what to do with that list: either rejoin 2061 * all the disks to the pool, or complete the splitting process. To attempt 2062 * the rejoin, each disk that is offlined is marked online again, and 2063 * we do a reopen() call. If the vdev label for every disk that was 2064 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2065 * then we call vdev_split() on each disk, and complete the split. 2066 * 2067 * Otherwise we leave the config alone, with all the vdevs in place in 2068 * the original pool. 2069 */ 2070static void 2071spa_try_repair(spa_t *spa, nvlist_t *config) 2072{ 2073 uint_t extracted; 2074 uint64_t *glist; 2075 uint_t i, gcount; 2076 nvlist_t *nvl; 2077 vdev_t **vd; 2078 boolean_t attempt_reopen; 2079 2080 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2081 return; 2082 2083 /* check that the config is complete */ 2084 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2085 &glist, &gcount) != 0) 2086 return; 2087 2088 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2089 2090 /* attempt to online all the vdevs & validate */ 2091 attempt_reopen = B_TRUE; 2092 for (i = 0; i < gcount; i++) { 2093 if (glist[i] == 0) /* vdev is hole */ 2094 continue; 2095 2096 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2097 if (vd[i] == NULL) { 2098 /* 2099 * Don't bother attempting to reopen the disks; 2100 * just do the split. 2101 */ 2102 attempt_reopen = B_FALSE; 2103 } else { 2104 /* attempt to re-online it */ 2105 vd[i]->vdev_offline = B_FALSE; 2106 } 2107 } 2108 2109 if (attempt_reopen) { 2110 vdev_reopen(spa->spa_root_vdev); 2111 2112 /* check each device to see what state it's in */ 2113 for (extracted = 0, i = 0; i < gcount; i++) { 2114 if (vd[i] != NULL && 2115 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2116 break; 2117 ++extracted; 2118 } 2119 } 2120 2121 /* 2122 * If every disk has been moved to the new pool, or if we never 2123 * even attempted to look at them, then we split them off for 2124 * good. 2125 */ 2126 if (!attempt_reopen || gcount == extracted) { 2127 for (i = 0; i < gcount; i++) 2128 if (vd[i] != NULL) 2129 vdev_split(vd[i]); 2130 vdev_reopen(spa->spa_root_vdev); 2131 } 2132 2133 kmem_free(vd, gcount * sizeof (vdev_t *)); 2134} 2135 2136static int 2137spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type, 2138 boolean_t mosconfig) 2139{ 2140 nvlist_t *config = spa->spa_config; 2141 char *ereport = FM_EREPORT_ZFS_POOL; 2142 char *comment; 2143 int error; 2144 uint64_t pool_guid; 2145 nvlist_t *nvl; 2146 2147 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) 2148 return (SET_ERROR(EINVAL)); 2149 2150 ASSERT(spa->spa_comment == NULL); 2151 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2152 spa->spa_comment = spa_strdup(comment); 2153 2154 /* 2155 * Versioning wasn't explicitly added to the label until later, so if 2156 * it's not present treat it as the initial version. 2157 */ 2158 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2159 &spa->spa_ubsync.ub_version) != 0) 2160 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2161 2162 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2163 &spa->spa_config_txg); 2164 2165 if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) && 2166 spa_guid_exists(pool_guid, 0)) { 2167 error = SET_ERROR(EEXIST); 2168 } else { 2169 spa->spa_config_guid = pool_guid; 2170 2171 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, 2172 &nvl) == 0) { 2173 VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting, 2174 KM_SLEEP) == 0); 2175 } 2176 2177 nvlist_free(spa->spa_load_info); 2178 spa->spa_load_info = fnvlist_alloc(); 2179 2180 gethrestime(&spa->spa_loaded_ts); 2181 error = spa_load_impl(spa, pool_guid, config, state, type, 2182 mosconfig, &ereport); 2183 } 2184 2185 /* 2186 * Don't count references from objsets that are already closed 2187 * and are making their way through the eviction process. 2188 */ 2189 spa_evicting_os_wait(spa); 2190 spa->spa_minref = refcount_count(&spa->spa_refcount); 2191 if (error) { 2192 if (error != EEXIST) { 2193 spa->spa_loaded_ts.tv_sec = 0; 2194 spa->spa_loaded_ts.tv_nsec = 0; 2195 } 2196 if (error != EBADF) { 2197 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2198 } 2199 } 2200 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2201 spa->spa_ena = 0; 2202 2203 return (error); 2204} 2205 2206/* 2207 * Load an existing storage pool, using the pool's builtin spa_config as a 2208 * source of configuration information. 2209 */ 2210static int 2211spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config, 2212 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 2213 char **ereport) 2214{ 2215 int error = 0; 2216 nvlist_t *nvroot = NULL; 2217 nvlist_t *label; 2218 vdev_t *rvd; 2219 uberblock_t *ub = &spa->spa_uberblock; 2220 uint64_t children, config_cache_txg = spa->spa_config_txg; 2221 int orig_mode = spa->spa_mode; 2222 int parse; 2223 uint64_t obj; 2224 boolean_t missing_feat_write = B_FALSE; 2225 2226 /* 2227 * If this is an untrusted config, access the pool in read-only mode. 2228 * This prevents things like resilvering recently removed devices. 2229 */ 2230 if (!mosconfig) 2231 spa->spa_mode = FREAD; 2232 2233 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2234 2235 spa->spa_load_state = state; 2236 2237 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot)) 2238 return (SET_ERROR(EINVAL)); 2239 2240 parse = (type == SPA_IMPORT_EXISTING ? 2241 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2242 2243 /* 2244 * Create "The Godfather" zio to hold all async IOs 2245 */ 2246 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2247 KM_SLEEP); 2248 for (int i = 0; i < max_ncpus; i++) { 2249 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2250 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2251 ZIO_FLAG_GODFATHER); 2252 } 2253 2254 /* 2255 * Parse the configuration into a vdev tree. We explicitly set the 2256 * value that will be returned by spa_version() since parsing the 2257 * configuration requires knowing the version number. 2258 */ 2259 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2260 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse); 2261 spa_config_exit(spa, SCL_ALL, FTAG); 2262 2263 if (error != 0) 2264 return (error); 2265 2266 ASSERT(spa->spa_root_vdev == rvd); 2267 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2268 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2269 2270 if (type != SPA_IMPORT_ASSEMBLE) { 2271 ASSERT(spa_guid(spa) == pool_guid); 2272 } 2273 2274 /* 2275 * Try to open all vdevs, loading each label in the process. 2276 */ 2277 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2278 error = vdev_open(rvd); 2279 spa_config_exit(spa, SCL_ALL, FTAG); 2280 if (error != 0) 2281 return (error); 2282 2283 /* 2284 * We need to validate the vdev labels against the configuration that 2285 * we have in hand, which is dependent on the setting of mosconfig. If 2286 * mosconfig is true then we're validating the vdev labels based on 2287 * that config. Otherwise, we're validating against the cached config 2288 * (zpool.cache) that was read when we loaded the zfs module, and then 2289 * later we will recursively call spa_load() and validate against 2290 * the vdev config. 2291 * 2292 * If we're assembling a new pool that's been split off from an 2293 * existing pool, the labels haven't yet been updated so we skip 2294 * validation for now. 2295 */ 2296 if (type != SPA_IMPORT_ASSEMBLE) { 2297 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2298 error = vdev_validate(rvd, mosconfig); 2299 spa_config_exit(spa, SCL_ALL, FTAG); 2300 2301 if (error != 0) 2302 return (error); 2303 2304 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2305 return (SET_ERROR(ENXIO)); 2306 } 2307 2308 /* 2309 * Find the best uberblock. 2310 */ 2311 vdev_uberblock_load(rvd, ub, &label); 2312 2313 /* 2314 * If we weren't able to find a single valid uberblock, return failure. 2315 */ 2316 if (ub->ub_txg == 0) { 2317 nvlist_free(label); 2318 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2319 } 2320 2321 /* 2322 * If the pool has an unsupported version we can't open it. 2323 */ 2324 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2325 nvlist_free(label); 2326 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2327 } 2328 2329 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2330 nvlist_t *features; 2331 2332 /* 2333 * If we weren't able to find what's necessary for reading the 2334 * MOS in the label, return failure. 2335 */ 2336 if (label == NULL || nvlist_lookup_nvlist(label, 2337 ZPOOL_CONFIG_FEATURES_FOR_READ, &features) != 0) { 2338 nvlist_free(label); 2339 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2340 ENXIO)); 2341 } 2342 2343 /* 2344 * Update our in-core representation with the definitive values 2345 * from the label. 2346 */ 2347 nvlist_free(spa->spa_label_features); 2348 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2349 } 2350 2351 nvlist_free(label); 2352 2353 /* 2354 * Look through entries in the label nvlist's features_for_read. If 2355 * there is a feature listed there which we don't understand then we 2356 * cannot open a pool. 2357 */ 2358 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2359 nvlist_t *unsup_feat; 2360 2361 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2362 0); 2363 2364 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2365 NULL); nvp != NULL; 2366 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2367 if (!zfeature_is_supported(nvpair_name(nvp))) { 2368 VERIFY(nvlist_add_string(unsup_feat, 2369 nvpair_name(nvp), "") == 0); 2370 } 2371 } 2372 2373 if (!nvlist_empty(unsup_feat)) { 2374 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2375 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2376 nvlist_free(unsup_feat); 2377 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2378 ENOTSUP)); 2379 } 2380 2381 nvlist_free(unsup_feat); 2382 } 2383 2384 /* 2385 * If the vdev guid sum doesn't match the uberblock, we have an 2386 * incomplete configuration. We first check to see if the pool 2387 * is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN). 2388 * If it is, defer the vdev_guid_sum check till later so we 2389 * can handle missing vdevs. 2390 */ 2391 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, 2392 &children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE && 2393 rvd->vdev_guid_sum != ub->ub_guid_sum) 2394 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2395 2396 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2397 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2398 spa_try_repair(spa, config); 2399 spa_config_exit(spa, SCL_ALL, FTAG); 2400 nvlist_free(spa->spa_config_splitting); 2401 spa->spa_config_splitting = NULL; 2402 } 2403 2404 /* 2405 * Initialize internal SPA structures. 2406 */ 2407 spa->spa_state = POOL_STATE_ACTIVE; 2408 spa->spa_ubsync = spa->spa_uberblock; 2409 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2410 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2411 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2412 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2413 spa->spa_claim_max_txg = spa->spa_first_txg; 2414 spa->spa_prev_software_version = ub->ub_software_version; 2415 2416 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2417 if (error) 2418 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2419 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2420 2421 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0) 2422 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2423 2424 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2425 boolean_t missing_feat_read = B_FALSE; 2426 nvlist_t *unsup_feat, *enabled_feat; 2427 2428 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2429 &spa->spa_feat_for_read_obj) != 0) { 2430 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2431 } 2432 2433 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2434 &spa->spa_feat_for_write_obj) != 0) { 2435 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2436 } 2437 2438 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 2439 &spa->spa_feat_desc_obj) != 0) { 2440 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2441 } 2442 2443 enabled_feat = fnvlist_alloc(); 2444 unsup_feat = fnvlist_alloc(); 2445 2446 if (!spa_features_check(spa, B_FALSE, 2447 unsup_feat, enabled_feat)) 2448 missing_feat_read = B_TRUE; 2449 2450 if (spa_writeable(spa) || state == SPA_LOAD_TRYIMPORT) { 2451 if (!spa_features_check(spa, B_TRUE, 2452 unsup_feat, enabled_feat)) { 2453 missing_feat_write = B_TRUE; 2454 } 2455 } 2456 2457 fnvlist_add_nvlist(spa->spa_load_info, 2458 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 2459 2460 if (!nvlist_empty(unsup_feat)) { 2461 fnvlist_add_nvlist(spa->spa_load_info, 2462 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 2463 } 2464 2465 fnvlist_free(enabled_feat); 2466 fnvlist_free(unsup_feat); 2467 2468 if (!missing_feat_read) { 2469 fnvlist_add_boolean(spa->spa_load_info, 2470 ZPOOL_CONFIG_CAN_RDONLY); 2471 } 2472 2473 /* 2474 * If the state is SPA_LOAD_TRYIMPORT, our objective is 2475 * twofold: to determine whether the pool is available for 2476 * import in read-write mode and (if it is not) whether the 2477 * pool is available for import in read-only mode. If the pool 2478 * is available for import in read-write mode, it is displayed 2479 * as available in userland; if it is not available for import 2480 * in read-only mode, it is displayed as unavailable in 2481 * userland. If the pool is available for import in read-only 2482 * mode but not read-write mode, it is displayed as unavailable 2483 * in userland with a special note that the pool is actually 2484 * available for open in read-only mode. 2485 * 2486 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 2487 * missing a feature for write, we must first determine whether 2488 * the pool can be opened read-only before returning to 2489 * userland in order to know whether to display the 2490 * abovementioned note. 2491 */ 2492 if (missing_feat_read || (missing_feat_write && 2493 spa_writeable(spa))) { 2494 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2495 ENOTSUP)); 2496 } 2497 2498 /* 2499 * Load refcounts for ZFS features from disk into an in-memory 2500 * cache during SPA initialization. 2501 */ 2502 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 2503 uint64_t refcount; 2504 2505 error = feature_get_refcount_from_disk(spa, 2506 &spa_feature_table[i], &refcount); 2507 if (error == 0) { 2508 spa->spa_feat_refcount_cache[i] = refcount; 2509 } else if (error == ENOTSUP) { 2510 spa->spa_feat_refcount_cache[i] = 2511 SPA_FEATURE_DISABLED; 2512 } else { 2513 return (spa_vdev_err(rvd, 2514 VDEV_AUX_CORRUPT_DATA, EIO)); 2515 } 2516 } 2517 } 2518 2519 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 2520 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 2521 &spa->spa_feat_enabled_txg_obj) != 0) 2522 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2523 } 2524 2525 spa->spa_is_initializing = B_TRUE; 2526 error = dsl_pool_open(spa->spa_dsl_pool); 2527 spa->spa_is_initializing = B_FALSE; 2528 if (error != 0) 2529 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2530 2531 if (!mosconfig) { 2532 uint64_t hostid; 2533 nvlist_t *policy = NULL, *nvconfig; 2534 2535 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2536 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2537 2538 if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig, 2539 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2540 char *hostname; 2541 unsigned long myhostid = 0; 2542 2543 VERIFY(nvlist_lookup_string(nvconfig, 2544 ZPOOL_CONFIG_HOSTNAME, &hostname) == 0); 2545 2546#ifdef _KERNEL 2547 myhostid = zone_get_hostid(NULL); 2548#else /* _KERNEL */ 2549 /* 2550 * We're emulating the system's hostid in userland, so 2551 * we can't use zone_get_hostid(). 2552 */ 2553 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid); 2554#endif /* _KERNEL */ 2555 if (check_hostid && hostid != 0 && myhostid != 0 && 2556 hostid != myhostid) { 2557 nvlist_free(nvconfig); 2558 cmn_err(CE_WARN, "pool '%s' could not be " 2559 "loaded as it was last accessed by " 2560 "another system (host: %s hostid: 0x%lx). " 2561 "See: http://illumos.org/msg/ZFS-8000-EY", 2562 spa_name(spa), hostname, 2563 (unsigned long)hostid); 2564 return (SET_ERROR(EBADF)); 2565 } 2566 } 2567 if (nvlist_lookup_nvlist(spa->spa_config, 2568 ZPOOL_REWIND_POLICY, &policy) == 0) 2569 VERIFY(nvlist_add_nvlist(nvconfig, 2570 ZPOOL_REWIND_POLICY, policy) == 0); 2571 2572 spa_config_set(spa, nvconfig); 2573 spa_unload(spa); 2574 spa_deactivate(spa); 2575 spa_activate(spa, orig_mode); 2576 2577 return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE)); 2578 } 2579 2580 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0) 2581 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2582 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 2583 if (error != 0) 2584 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2585 2586 /* 2587 * Load the bit that tells us to use the new accounting function 2588 * (raid-z deflation). If we have an older pool, this will not 2589 * be present. 2590 */ 2591 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate); 2592 if (error != 0 && error != ENOENT) 2593 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2594 2595 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 2596 &spa->spa_creation_version); 2597 if (error != 0 && error != ENOENT) 2598 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2599 2600 /* 2601 * Load the persistent error log. If we have an older pool, this will 2602 * not be present. 2603 */ 2604 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last); 2605 if (error != 0 && error != ENOENT) 2606 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2607 2608 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 2609 &spa->spa_errlog_scrub); 2610 if (error != 0 && error != ENOENT) 2611 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2612 2613 /* 2614 * Load the history object. If we have an older pool, this 2615 * will not be present. 2616 */ 2617 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history); 2618 if (error != 0 && error != ENOENT) 2619 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2620 2621 /* 2622 * If we're assembling the pool from the split-off vdevs of 2623 * an existing pool, we don't want to attach the spares & cache 2624 * devices. 2625 */ 2626 2627 /* 2628 * Load any hot spares for this pool. 2629 */ 2630 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object); 2631 if (error != 0 && error != ENOENT) 2632 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2633 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2634 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 2635 if (load_nvlist(spa, spa->spa_spares.sav_object, 2636 &spa->spa_spares.sav_config) != 0) 2637 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2638 2639 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2640 spa_load_spares(spa); 2641 spa_config_exit(spa, SCL_ALL, FTAG); 2642 } else if (error == 0) { 2643 spa->spa_spares.sav_sync = B_TRUE; 2644 } 2645 2646 /* 2647 * Load any level 2 ARC devices for this pool. 2648 */ 2649 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 2650 &spa->spa_l2cache.sav_object); 2651 if (error != 0 && error != ENOENT) 2652 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2653 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2654 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 2655 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 2656 &spa->spa_l2cache.sav_config) != 0) 2657 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2658 2659 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2660 spa_load_l2cache(spa); 2661 spa_config_exit(spa, SCL_ALL, FTAG); 2662 } else if (error == 0) { 2663 spa->spa_l2cache.sav_sync = B_TRUE; 2664 } 2665 2666 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 2667 2668 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object); 2669 if (error && error != ENOENT) 2670 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2671 2672 if (error == 0) { 2673 uint64_t autoreplace; 2674 2675 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 2676 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 2677 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 2678 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 2679 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 2680 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 2681 &spa->spa_dedup_ditto); 2682 2683 spa->spa_autoreplace = (autoreplace != 0); 2684 } 2685 2686 /* 2687 * If the 'autoreplace' property is set, then post a resource notifying 2688 * the ZFS DE that it should not issue any faults for unopenable 2689 * devices. We also iterate over the vdevs, and post a sysevent for any 2690 * unopenable vdevs so that the normal autoreplace handler can take 2691 * over. 2692 */ 2693 if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) { 2694 spa_check_removed(spa->spa_root_vdev); 2695 /* 2696 * For the import case, this is done in spa_import(), because 2697 * at this point we're using the spare definitions from 2698 * the MOS config, not necessarily from the userland config. 2699 */ 2700 if (state != SPA_LOAD_IMPORT) { 2701 spa_aux_check_removed(&spa->spa_spares); 2702 spa_aux_check_removed(&spa->spa_l2cache); 2703 } 2704 } 2705 2706 /* 2707 * Load the vdev state for all toplevel vdevs. 2708 */ 2709 vdev_load(rvd); 2710 2711 /* 2712 * Propagate the leaf DTLs we just loaded all the way up the tree. 2713 */ 2714 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2715 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 2716 spa_config_exit(spa, SCL_ALL, FTAG); 2717 2718 /* 2719 * Load the DDTs (dedup tables). 2720 */ 2721 error = ddt_load(spa); 2722 if (error != 0) 2723 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2724 2725 spa_update_dspace(spa); 2726 2727 /* 2728 * Validate the config, using the MOS config to fill in any 2729 * information which might be missing. If we fail to validate 2730 * the config then declare the pool unfit for use. If we're 2731 * assembling a pool from a split, the log is not transferred 2732 * over. 2733 */ 2734 if (type != SPA_IMPORT_ASSEMBLE) { 2735 nvlist_t *nvconfig; 2736 2737 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2738 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2739 2740 if (!spa_config_valid(spa, nvconfig)) { 2741 nvlist_free(nvconfig); 2742 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2743 ENXIO)); 2744 } 2745 nvlist_free(nvconfig); 2746 2747 /* 2748 * Now that we've validated the config, check the state of the 2749 * root vdev. If it can't be opened, it indicates one or 2750 * more toplevel vdevs are faulted. 2751 */ 2752 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2753 return (SET_ERROR(ENXIO)); 2754 2755 if (spa_writeable(spa) && spa_check_logs(spa)) { 2756 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 2757 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO)); 2758 } 2759 } 2760 2761 if (missing_feat_write) { 2762 ASSERT(state == SPA_LOAD_TRYIMPORT); 2763 2764 /* 2765 * At this point, we know that we can open the pool in 2766 * read-only mode but not read-write mode. We now have enough 2767 * information and can return to userland. 2768 */ 2769 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, ENOTSUP)); 2770 } 2771 2772 /* 2773 * We've successfully opened the pool, verify that we're ready 2774 * to start pushing transactions. 2775 */ 2776 if (state != SPA_LOAD_TRYIMPORT) { 2777 if (error = spa_load_verify(spa)) 2778 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2779 error)); 2780 } 2781 2782 if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER || 2783 spa->spa_load_max_txg == UINT64_MAX)) { 2784 dmu_tx_t *tx; 2785 int need_update = B_FALSE; 2786 2787 ASSERT(state != SPA_LOAD_TRYIMPORT); 2788 2789 /* 2790 * Claim log blocks that haven't been committed yet. 2791 * This must all happen in a single txg. 2792 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 2793 * invoked from zil_claim_log_block()'s i/o done callback. 2794 * Price of rollback is that we abandon the log. 2795 */ 2796 spa->spa_claiming = B_TRUE; 2797 2798 tx = dmu_tx_create_assigned(spa_get_dsl(spa), 2799 spa_first_txg(spa)); 2800 (void) dmu_objset_find(spa_name(spa), 2801 zil_claim, tx, DS_FIND_CHILDREN); 2802 dmu_tx_commit(tx); 2803 2804 spa->spa_claiming = B_FALSE; 2805 2806 spa_set_log_state(spa, SPA_LOG_GOOD); 2807 spa->spa_sync_on = B_TRUE; 2808 txg_sync_start(spa->spa_dsl_pool); 2809 2810 /* 2811 * Wait for all claims to sync. We sync up to the highest 2812 * claimed log block birth time so that claimed log blocks 2813 * don't appear to be from the future. spa_claim_max_txg 2814 * will have been set for us by either zil_check_log_chain() 2815 * (invoked from spa_check_logs()) or zil_claim() above. 2816 */ 2817 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 2818 2819 /* 2820 * If the config cache is stale, or we have uninitialized 2821 * metaslabs (see spa_vdev_add()), then update the config. 2822 * 2823 * If this is a verbatim import, trust the current 2824 * in-core spa_config and update the disk labels. 2825 */ 2826 if (config_cache_txg != spa->spa_config_txg || 2827 state == SPA_LOAD_IMPORT || 2828 state == SPA_LOAD_RECOVER || 2829 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 2830 need_update = B_TRUE; 2831 2832 for (int c = 0; c < rvd->vdev_children; c++) 2833 if (rvd->vdev_child[c]->vdev_ms_array == 0) 2834 need_update = B_TRUE; 2835 2836 /* 2837 * Update the config cache asychronously in case we're the 2838 * root pool, in which case the config cache isn't writable yet. 2839 */ 2840 if (need_update) 2841 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2842 2843 /* 2844 * Check all DTLs to see if anything needs resilvering. 2845 */ 2846 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 2847 vdev_resilver_needed(rvd, NULL, NULL)) 2848 spa_async_request(spa, SPA_ASYNC_RESILVER); 2849 2850 /* 2851 * Log the fact that we booted up (so that we can detect if 2852 * we rebooted in the middle of an operation). 2853 */ 2854 spa_history_log_version(spa, "open"); 2855 2856 /* 2857 * Delete any inconsistent datasets. 2858 */ 2859 (void) dmu_objset_find(spa_name(spa), 2860 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 2861 2862 /* 2863 * Clean up any stale temporary dataset userrefs. 2864 */ 2865 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 2866 } 2867 2868 return (0); 2869} 2870 2871static int 2872spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig) 2873{ 2874 int mode = spa->spa_mode; 2875 2876 spa_unload(spa); 2877 spa_deactivate(spa); 2878 2879 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 2880 2881 spa_activate(spa, mode); 2882 spa_async_suspend(spa); 2883 2884 return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig)); 2885} 2886 2887/* 2888 * If spa_load() fails this function will try loading prior txg's. If 2889 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 2890 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 2891 * function will not rewind the pool and will return the same error as 2892 * spa_load(). 2893 */ 2894static int 2895spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig, 2896 uint64_t max_request, int rewind_flags) 2897{ 2898 nvlist_t *loadinfo = NULL; 2899 nvlist_t *config = NULL; 2900 int load_error, rewind_error; 2901 uint64_t safe_rewind_txg; 2902 uint64_t min_txg; 2903 2904 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 2905 spa->spa_load_max_txg = spa->spa_load_txg; 2906 spa_set_log_state(spa, SPA_LOG_CLEAR); 2907 } else { 2908 spa->spa_load_max_txg = max_request; 2909 if (max_request != UINT64_MAX) 2910 spa->spa_extreme_rewind = B_TRUE; 2911 } 2912 2913 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING, 2914 mosconfig); 2915 if (load_error == 0) 2916 return (0); 2917 2918 if (spa->spa_root_vdev != NULL) 2919 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 2920 2921 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 2922 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 2923 2924 if (rewind_flags & ZPOOL_NEVER_REWIND) { 2925 nvlist_free(config); 2926 return (load_error); 2927 } 2928 2929 if (state == SPA_LOAD_RECOVER) { 2930 /* Price of rolling back is discarding txgs, including log */ 2931 spa_set_log_state(spa, SPA_LOG_CLEAR); 2932 } else { 2933 /* 2934 * If we aren't rolling back save the load info from our first 2935 * import attempt so that we can restore it after attempting 2936 * to rewind. 2937 */ 2938 loadinfo = spa->spa_load_info; 2939 spa->spa_load_info = fnvlist_alloc(); 2940 } 2941 2942 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 2943 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 2944 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 2945 TXG_INITIAL : safe_rewind_txg; 2946 2947 /* 2948 * Continue as long as we're finding errors, we're still within 2949 * the acceptable rewind range, and we're still finding uberblocks 2950 */ 2951 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 2952 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 2953 if (spa->spa_load_max_txg < safe_rewind_txg) 2954 spa->spa_extreme_rewind = B_TRUE; 2955 rewind_error = spa_load_retry(spa, state, mosconfig); 2956 } 2957 2958 spa->spa_extreme_rewind = B_FALSE; 2959 spa->spa_load_max_txg = UINT64_MAX; 2960 2961 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 2962 spa_config_set(spa, config); 2963 2964 if (state == SPA_LOAD_RECOVER) { 2965 ASSERT3P(loadinfo, ==, NULL); 2966 return (rewind_error); 2967 } else { 2968 /* Store the rewind info as part of the initial load info */ 2969 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 2970 spa->spa_load_info); 2971 2972 /* Restore the initial load info */ 2973 fnvlist_free(spa->spa_load_info); 2974 spa->spa_load_info = loadinfo; 2975 2976 return (load_error); 2977 } 2978} 2979 2980/* 2981 * Pool Open/Import 2982 * 2983 * The import case is identical to an open except that the configuration is sent 2984 * down from userland, instead of grabbed from the configuration cache. For the 2985 * case of an open, the pool configuration will exist in the 2986 * POOL_STATE_UNINITIALIZED state. 2987 * 2988 * The stats information (gen/count/ustats) is used to gather vdev statistics at 2989 * the same time open the pool, without having to keep around the spa_t in some 2990 * ambiguous state. 2991 */ 2992static int 2993spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 2994 nvlist_t **config) 2995{ 2996 spa_t *spa; 2997 spa_load_state_t state = SPA_LOAD_OPEN; 2998 int error; 2999 int locked = B_FALSE; 3000 int firstopen = B_FALSE; 3001 3002 *spapp = NULL; 3003 3004 /* 3005 * As disgusting as this is, we need to support recursive calls to this 3006 * function because dsl_dir_open() is called during spa_load(), and ends 3007 * up calling spa_open() again. The real fix is to figure out how to 3008 * avoid dsl_dir_open() calling this in the first place. 3009 */ 3010 if (mutex_owner(&spa_namespace_lock) != curthread) { 3011 mutex_enter(&spa_namespace_lock); 3012 locked = B_TRUE; 3013 } 3014 3015 if ((spa = spa_lookup(pool)) == NULL) { 3016 if (locked) 3017 mutex_exit(&spa_namespace_lock); 3018 return (SET_ERROR(ENOENT)); 3019 } 3020 3021 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 3022 zpool_rewind_policy_t policy; 3023 3024 firstopen = B_TRUE; 3025 3026 zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config, 3027 &policy); 3028 if (policy.zrp_request & ZPOOL_DO_REWIND) 3029 state = SPA_LOAD_RECOVER; 3030 3031 spa_activate(spa, spa_mode_global); 3032 3033 if (state != SPA_LOAD_RECOVER) 3034 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 3035 3036 error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg, 3037 policy.zrp_request); 3038 3039 if (error == EBADF) { 3040 /* 3041 * If vdev_validate() returns failure (indicated by 3042 * EBADF), it indicates that one of the vdevs indicates 3043 * that the pool has been exported or destroyed. If 3044 * this is the case, the config cache is out of sync and 3045 * we should remove the pool from the namespace. 3046 */ 3047 spa_unload(spa); 3048 spa_deactivate(spa); 3049 spa_config_sync(spa, B_TRUE, B_TRUE); 3050 spa_remove(spa); 3051 if (locked) 3052 mutex_exit(&spa_namespace_lock); 3053 return (SET_ERROR(ENOENT)); 3054 } 3055 3056 if (error) { 3057 /* 3058 * We can't open the pool, but we still have useful 3059 * information: the state of each vdev after the 3060 * attempted vdev_open(). Return this to the user. 3061 */ 3062 if (config != NULL && spa->spa_config) { 3063 VERIFY(nvlist_dup(spa->spa_config, config, 3064 KM_SLEEP) == 0); 3065 VERIFY(nvlist_add_nvlist(*config, 3066 ZPOOL_CONFIG_LOAD_INFO, 3067 spa->spa_load_info) == 0); 3068 } 3069 spa_unload(spa); 3070 spa_deactivate(spa); 3071 spa->spa_last_open_failed = error; 3072 if (locked) 3073 mutex_exit(&spa_namespace_lock); 3074 *spapp = NULL; 3075 return (error); 3076 } 3077 } 3078 3079 spa_open_ref(spa, tag); 3080 3081 if (config != NULL) 3082 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 3083 3084 /* 3085 * If we've recovered the pool, pass back any information we 3086 * gathered while doing the load. 3087 */ 3088 if (state == SPA_LOAD_RECOVER) { 3089 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 3090 spa->spa_load_info) == 0); 3091 } 3092 3093 if (locked) { 3094 spa->spa_last_open_failed = 0; 3095 spa->spa_last_ubsync_txg = 0; 3096 spa->spa_load_txg = 0; 3097 mutex_exit(&spa_namespace_lock); 3098#ifdef __FreeBSD__ 3099#ifdef _KERNEL 3100 if (firstopen) 3101 zvol_create_minors(spa->spa_name); 3102#endif 3103#endif 3104 } 3105 3106 *spapp = spa; 3107 3108 return (0); 3109} 3110 3111int 3112spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 3113 nvlist_t **config) 3114{ 3115 return (spa_open_common(name, spapp, tag, policy, config)); 3116} 3117 3118int 3119spa_open(const char *name, spa_t **spapp, void *tag) 3120{ 3121 return (spa_open_common(name, spapp, tag, NULL, NULL)); 3122} 3123 3124/* 3125 * Lookup the given spa_t, incrementing the inject count in the process, 3126 * preventing it from being exported or destroyed. 3127 */ 3128spa_t * 3129spa_inject_addref(char *name) 3130{ 3131 spa_t *spa; 3132 3133 mutex_enter(&spa_namespace_lock); 3134 if ((spa = spa_lookup(name)) == NULL) { 3135 mutex_exit(&spa_namespace_lock); 3136 return (NULL); 3137 } 3138 spa->spa_inject_ref++; 3139 mutex_exit(&spa_namespace_lock); 3140 3141 return (spa); 3142} 3143 3144void 3145spa_inject_delref(spa_t *spa) 3146{ 3147 mutex_enter(&spa_namespace_lock); 3148 spa->spa_inject_ref--; 3149 mutex_exit(&spa_namespace_lock); 3150} 3151 3152/* 3153 * Add spares device information to the nvlist. 3154 */ 3155static void 3156spa_add_spares(spa_t *spa, nvlist_t *config) 3157{ 3158 nvlist_t **spares; 3159 uint_t i, nspares; 3160 nvlist_t *nvroot; 3161 uint64_t guid; 3162 vdev_stat_t *vs; 3163 uint_t vsc; 3164 uint64_t pool; 3165 3166 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3167 3168 if (spa->spa_spares.sav_count == 0) 3169 return; 3170 3171 VERIFY(nvlist_lookup_nvlist(config, 3172 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3173 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 3174 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3175 if (nspares != 0) { 3176 VERIFY(nvlist_add_nvlist_array(nvroot, 3177 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3178 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3179 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3180 3181 /* 3182 * Go through and find any spares which have since been 3183 * repurposed as an active spare. If this is the case, update 3184 * their status appropriately. 3185 */ 3186 for (i = 0; i < nspares; i++) { 3187 VERIFY(nvlist_lookup_uint64(spares[i], 3188 ZPOOL_CONFIG_GUID, &guid) == 0); 3189 if (spa_spare_exists(guid, &pool, NULL) && 3190 pool != 0ULL) { 3191 VERIFY(nvlist_lookup_uint64_array( 3192 spares[i], ZPOOL_CONFIG_VDEV_STATS, 3193 (uint64_t **)&vs, &vsc) == 0); 3194 vs->vs_state = VDEV_STATE_CANT_OPEN; 3195 vs->vs_aux = VDEV_AUX_SPARED; 3196 } 3197 } 3198 } 3199} 3200 3201/* 3202 * Add l2cache device information to the nvlist, including vdev stats. 3203 */ 3204static void 3205spa_add_l2cache(spa_t *spa, nvlist_t *config) 3206{ 3207 nvlist_t **l2cache; 3208 uint_t i, j, nl2cache; 3209 nvlist_t *nvroot; 3210 uint64_t guid; 3211 vdev_t *vd; 3212 vdev_stat_t *vs; 3213 uint_t vsc; 3214 3215 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3216 3217 if (spa->spa_l2cache.sav_count == 0) 3218 return; 3219 3220 VERIFY(nvlist_lookup_nvlist(config, 3221 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3222 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 3223 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3224 if (nl2cache != 0) { 3225 VERIFY(nvlist_add_nvlist_array(nvroot, 3226 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3227 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3228 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3229 3230 /* 3231 * Update level 2 cache device stats. 3232 */ 3233 3234 for (i = 0; i < nl2cache; i++) { 3235 VERIFY(nvlist_lookup_uint64(l2cache[i], 3236 ZPOOL_CONFIG_GUID, &guid) == 0); 3237 3238 vd = NULL; 3239 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 3240 if (guid == 3241 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 3242 vd = spa->spa_l2cache.sav_vdevs[j]; 3243 break; 3244 } 3245 } 3246 ASSERT(vd != NULL); 3247 3248 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 3249 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 3250 == 0); 3251 vdev_get_stats(vd, vs); 3252 } 3253 } 3254} 3255 3256static void 3257spa_add_feature_stats(spa_t *spa, nvlist_t *config) 3258{ 3259 nvlist_t *features; 3260 zap_cursor_t zc; 3261 zap_attribute_t za; 3262 3263 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3264 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3265 3266 /* We may be unable to read features if pool is suspended. */ 3267 if (spa_suspended(spa)) 3268 goto out; 3269 3270 if (spa->spa_feat_for_read_obj != 0) { 3271 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3272 spa->spa_feat_for_read_obj); 3273 zap_cursor_retrieve(&zc, &za) == 0; 3274 zap_cursor_advance(&zc)) { 3275 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3276 za.za_num_integers == 1); 3277 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3278 za.za_first_integer)); 3279 } 3280 zap_cursor_fini(&zc); 3281 } 3282 3283 if (spa->spa_feat_for_write_obj != 0) { 3284 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3285 spa->spa_feat_for_write_obj); 3286 zap_cursor_retrieve(&zc, &za) == 0; 3287 zap_cursor_advance(&zc)) { 3288 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3289 za.za_num_integers == 1); 3290 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3291 za.za_first_integer)); 3292 } 3293 zap_cursor_fini(&zc); 3294 } 3295 3296out: 3297 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 3298 features) == 0); 3299 nvlist_free(features); 3300} 3301 3302int 3303spa_get_stats(const char *name, nvlist_t **config, 3304 char *altroot, size_t buflen) 3305{ 3306 int error; 3307 spa_t *spa; 3308 3309 *config = NULL; 3310 error = spa_open_common(name, &spa, FTAG, NULL, config); 3311 3312 if (spa != NULL) { 3313 /* 3314 * This still leaves a window of inconsistency where the spares 3315 * or l2cache devices could change and the config would be 3316 * self-inconsistent. 3317 */ 3318 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 3319 3320 if (*config != NULL) { 3321 uint64_t loadtimes[2]; 3322 3323 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 3324 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 3325 VERIFY(nvlist_add_uint64_array(*config, 3326 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 3327 3328 VERIFY(nvlist_add_uint64(*config, 3329 ZPOOL_CONFIG_ERRCOUNT, 3330 spa_get_errlog_size(spa)) == 0); 3331 3332 if (spa_suspended(spa)) 3333 VERIFY(nvlist_add_uint64(*config, 3334 ZPOOL_CONFIG_SUSPENDED, 3335 spa->spa_failmode) == 0); 3336 3337 spa_add_spares(spa, *config); 3338 spa_add_l2cache(spa, *config); 3339 spa_add_feature_stats(spa, *config); 3340 } 3341 } 3342 3343 /* 3344 * We want to get the alternate root even for faulted pools, so we cheat 3345 * and call spa_lookup() directly. 3346 */ 3347 if (altroot) { 3348 if (spa == NULL) { 3349 mutex_enter(&spa_namespace_lock); 3350 spa = spa_lookup(name); 3351 if (spa) 3352 spa_altroot(spa, altroot, buflen); 3353 else 3354 altroot[0] = '\0'; 3355 spa = NULL; 3356 mutex_exit(&spa_namespace_lock); 3357 } else { 3358 spa_altroot(spa, altroot, buflen); 3359 } 3360 } 3361 3362 if (spa != NULL) { 3363 spa_config_exit(spa, SCL_CONFIG, FTAG); 3364 spa_close(spa, FTAG); 3365 } 3366 3367 return (error); 3368} 3369 3370/* 3371 * Validate that the auxiliary device array is well formed. We must have an 3372 * array of nvlists, each which describes a valid leaf vdev. If this is an 3373 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 3374 * specified, as long as they are well-formed. 3375 */ 3376static int 3377spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 3378 spa_aux_vdev_t *sav, const char *config, uint64_t version, 3379 vdev_labeltype_t label) 3380{ 3381 nvlist_t **dev; 3382 uint_t i, ndev; 3383 vdev_t *vd; 3384 int error; 3385 3386 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3387 3388 /* 3389 * It's acceptable to have no devs specified. 3390 */ 3391 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 3392 return (0); 3393 3394 if (ndev == 0) 3395 return (SET_ERROR(EINVAL)); 3396 3397 /* 3398 * Make sure the pool is formatted with a version that supports this 3399 * device type. 3400 */ 3401 if (spa_version(spa) < version) 3402 return (SET_ERROR(ENOTSUP)); 3403 3404 /* 3405 * Set the pending device list so we correctly handle device in-use 3406 * checking. 3407 */ 3408 sav->sav_pending = dev; 3409 sav->sav_npending = ndev; 3410 3411 for (i = 0; i < ndev; i++) { 3412 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 3413 mode)) != 0) 3414 goto out; 3415 3416 if (!vd->vdev_ops->vdev_op_leaf) { 3417 vdev_free(vd); 3418 error = SET_ERROR(EINVAL); 3419 goto out; 3420 } 3421 3422 /* 3423 * The L2ARC currently only supports disk devices in 3424 * kernel context. For user-level testing, we allow it. 3425 */ 3426#ifdef _KERNEL 3427 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 3428 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 3429 error = SET_ERROR(ENOTBLK); 3430 vdev_free(vd); 3431 goto out; 3432 } 3433#endif 3434 vd->vdev_top = vd; 3435 3436 if ((error = vdev_open(vd)) == 0 && 3437 (error = vdev_label_init(vd, crtxg, label)) == 0) { 3438 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 3439 vd->vdev_guid) == 0); 3440 } 3441 3442 vdev_free(vd); 3443 3444 if (error && 3445 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 3446 goto out; 3447 else 3448 error = 0; 3449 } 3450 3451out: 3452 sav->sav_pending = NULL; 3453 sav->sav_npending = 0; 3454 return (error); 3455} 3456 3457static int 3458spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 3459{ 3460 int error; 3461 3462 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3463 3464 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3465 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 3466 VDEV_LABEL_SPARE)) != 0) { 3467 return (error); 3468 } 3469 3470 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3471 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 3472 VDEV_LABEL_L2CACHE)); 3473} 3474 3475static void 3476spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 3477 const char *config) 3478{ 3479 int i; 3480 3481 if (sav->sav_config != NULL) { 3482 nvlist_t **olddevs; 3483 uint_t oldndevs; 3484 nvlist_t **newdevs; 3485 3486 /* 3487 * Generate new dev list by concatentating with the 3488 * current dev list. 3489 */ 3490 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 3491 &olddevs, &oldndevs) == 0); 3492 3493 newdevs = kmem_alloc(sizeof (void *) * 3494 (ndevs + oldndevs), KM_SLEEP); 3495 for (i = 0; i < oldndevs; i++) 3496 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 3497 KM_SLEEP) == 0); 3498 for (i = 0; i < ndevs; i++) 3499 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 3500 KM_SLEEP) == 0); 3501 3502 VERIFY(nvlist_remove(sav->sav_config, config, 3503 DATA_TYPE_NVLIST_ARRAY) == 0); 3504 3505 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 3506 config, newdevs, ndevs + oldndevs) == 0); 3507 for (i = 0; i < oldndevs + ndevs; i++) 3508 nvlist_free(newdevs[i]); 3509 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 3510 } else { 3511 /* 3512 * Generate a new dev list. 3513 */ 3514 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 3515 KM_SLEEP) == 0); 3516 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 3517 devs, ndevs) == 0); 3518 } 3519} 3520 3521/* 3522 * Stop and drop level 2 ARC devices 3523 */ 3524void 3525spa_l2cache_drop(spa_t *spa) 3526{ 3527 vdev_t *vd; 3528 int i; 3529 spa_aux_vdev_t *sav = &spa->spa_l2cache; 3530 3531 for (i = 0; i < sav->sav_count; i++) { 3532 uint64_t pool; 3533 3534 vd = sav->sav_vdevs[i]; 3535 ASSERT(vd != NULL); 3536 3537 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 3538 pool != 0ULL && l2arc_vdev_present(vd)) 3539 l2arc_remove_vdev(vd); 3540 } 3541} 3542 3543/* 3544 * Pool Creation 3545 */ 3546int 3547spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 3548 nvlist_t *zplprops) 3549{ 3550 spa_t *spa; 3551 char *altroot = NULL; 3552 vdev_t *rvd; 3553 dsl_pool_t *dp; 3554 dmu_tx_t *tx; 3555 int error = 0; 3556 uint64_t txg = TXG_INITIAL; 3557 nvlist_t **spares, **l2cache; 3558 uint_t nspares, nl2cache; 3559 uint64_t version, obj; 3560 boolean_t has_features; 3561 3562 /* 3563 * If this pool already exists, return failure. 3564 */ 3565 mutex_enter(&spa_namespace_lock); 3566 if (spa_lookup(pool) != NULL) { 3567 mutex_exit(&spa_namespace_lock); 3568 return (SET_ERROR(EEXIST)); 3569 } 3570 3571 /* 3572 * Allocate a new spa_t structure. 3573 */ 3574 (void) nvlist_lookup_string(props, 3575 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 3576 spa = spa_add(pool, NULL, altroot); 3577 spa_activate(spa, spa_mode_global); 3578 3579 if (props && (error = spa_prop_validate(spa, props))) { 3580 spa_deactivate(spa); 3581 spa_remove(spa); 3582 mutex_exit(&spa_namespace_lock); 3583 return (error); 3584 } 3585 3586 has_features = B_FALSE; 3587 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 3588 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 3589 if (zpool_prop_feature(nvpair_name(elem))) 3590 has_features = B_TRUE; 3591 } 3592 3593 if (has_features || nvlist_lookup_uint64(props, 3594 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 3595 version = SPA_VERSION; 3596 } 3597 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 3598 3599 spa->spa_first_txg = txg; 3600 spa->spa_uberblock.ub_txg = txg - 1; 3601 spa->spa_uberblock.ub_version = version; 3602 spa->spa_ubsync = spa->spa_uberblock; 3603 3604 /* 3605 * Create "The Godfather" zio to hold all async IOs 3606 */ 3607 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 3608 KM_SLEEP); 3609 for (int i = 0; i < max_ncpus; i++) { 3610 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 3611 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 3612 ZIO_FLAG_GODFATHER); 3613 } 3614 3615 /* 3616 * Create the root vdev. 3617 */ 3618 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3619 3620 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 3621 3622 ASSERT(error != 0 || rvd != NULL); 3623 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 3624 3625 if (error == 0 && !zfs_allocatable_devs(nvroot)) 3626 error = SET_ERROR(EINVAL); 3627 3628 if (error == 0 && 3629 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 3630 (error = spa_validate_aux(spa, nvroot, txg, 3631 VDEV_ALLOC_ADD)) == 0) { 3632 for (int c = 0; c < rvd->vdev_children; c++) { 3633 vdev_ashift_optimize(rvd->vdev_child[c]); 3634 vdev_metaslab_set_size(rvd->vdev_child[c]); 3635 vdev_expand(rvd->vdev_child[c], txg); 3636 } 3637 } 3638 3639 spa_config_exit(spa, SCL_ALL, FTAG); 3640 3641 if (error != 0) { 3642 spa_unload(spa); 3643 spa_deactivate(spa); 3644 spa_remove(spa); 3645 mutex_exit(&spa_namespace_lock); 3646 return (error); 3647 } 3648 3649 /* 3650 * Get the list of spares, if specified. 3651 */ 3652 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 3653 &spares, &nspares) == 0) { 3654 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 3655 KM_SLEEP) == 0); 3656 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 3657 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3658 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3659 spa_load_spares(spa); 3660 spa_config_exit(spa, SCL_ALL, FTAG); 3661 spa->spa_spares.sav_sync = B_TRUE; 3662 } 3663 3664 /* 3665 * Get the list of level 2 cache devices, if specified. 3666 */ 3667 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 3668 &l2cache, &nl2cache) == 0) { 3669 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 3670 NV_UNIQUE_NAME, KM_SLEEP) == 0); 3671 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 3672 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3673 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3674 spa_load_l2cache(spa); 3675 spa_config_exit(spa, SCL_ALL, FTAG); 3676 spa->spa_l2cache.sav_sync = B_TRUE; 3677 } 3678 3679 spa->spa_is_initializing = B_TRUE; 3680 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 3681 spa->spa_meta_objset = dp->dp_meta_objset; 3682 spa->spa_is_initializing = B_FALSE; 3683 3684 /* 3685 * Create DDTs (dedup tables). 3686 */ 3687 ddt_create(spa); 3688 3689 spa_update_dspace(spa); 3690 3691 tx = dmu_tx_create_assigned(dp, txg); 3692 3693 /* 3694 * Create the pool config object. 3695 */ 3696 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 3697 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 3698 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 3699 3700 if (zap_add(spa->spa_meta_objset, 3701 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 3702 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 3703 cmn_err(CE_PANIC, "failed to add pool config"); 3704 } 3705 3706 if (spa_version(spa) >= SPA_VERSION_FEATURES) 3707 spa_feature_create_zap_objects(spa, tx); 3708 3709 if (zap_add(spa->spa_meta_objset, 3710 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 3711 sizeof (uint64_t), 1, &version, tx) != 0) { 3712 cmn_err(CE_PANIC, "failed to add pool version"); 3713 } 3714 3715 /* Newly created pools with the right version are always deflated. */ 3716 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 3717 spa->spa_deflate = TRUE; 3718 if (zap_add(spa->spa_meta_objset, 3719 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 3720 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 3721 cmn_err(CE_PANIC, "failed to add deflate"); 3722 } 3723 } 3724 3725 /* 3726 * Create the deferred-free bpobj. Turn off compression 3727 * because sync-to-convergence takes longer if the blocksize 3728 * keeps changing. 3729 */ 3730 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 3731 dmu_object_set_compress(spa->spa_meta_objset, obj, 3732 ZIO_COMPRESS_OFF, tx); 3733 if (zap_add(spa->spa_meta_objset, 3734 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 3735 sizeof (uint64_t), 1, &obj, tx) != 0) { 3736 cmn_err(CE_PANIC, "failed to add bpobj"); 3737 } 3738 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 3739 spa->spa_meta_objset, obj)); 3740 3741 /* 3742 * Create the pool's history object. 3743 */ 3744 if (version >= SPA_VERSION_ZPOOL_HISTORY) 3745 spa_history_create_obj(spa, tx); 3746 3747 /* 3748 * Set pool properties. 3749 */ 3750 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 3751 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3752 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 3753 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 3754 3755 if (props != NULL) { 3756 spa_configfile_set(spa, props, B_FALSE); 3757 spa_sync_props(props, tx); 3758 } 3759 3760 dmu_tx_commit(tx); 3761 3762 spa->spa_sync_on = B_TRUE; 3763 txg_sync_start(spa->spa_dsl_pool); 3764 3765 /* 3766 * We explicitly wait for the first transaction to complete so that our 3767 * bean counters are appropriately updated. 3768 */ 3769 txg_wait_synced(spa->spa_dsl_pool, txg); 3770 3771 spa_config_sync(spa, B_FALSE, B_TRUE); 3772 3773 spa_history_log_version(spa, "create"); 3774 3775 /* 3776 * Don't count references from objsets that are already closed 3777 * and are making their way through the eviction process. 3778 */ 3779 spa_evicting_os_wait(spa); 3780 spa->spa_minref = refcount_count(&spa->spa_refcount); 3781 3782 mutex_exit(&spa_namespace_lock); 3783 3784 return (0); 3785} 3786 3787#ifdef _KERNEL 3788#if defined(sun) 3789/* 3790 * Get the root pool information from the root disk, then import the root pool 3791 * during the system boot up time. 3792 */ 3793extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 3794 3795static nvlist_t * 3796spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 3797{ 3798 nvlist_t *config; 3799 nvlist_t *nvtop, *nvroot; 3800 uint64_t pgid; 3801 3802 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 3803 return (NULL); 3804 3805 /* 3806 * Add this top-level vdev to the child array. 3807 */ 3808 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3809 &nvtop) == 0); 3810 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 3811 &pgid) == 0); 3812 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 3813 3814 /* 3815 * Put this pool's top-level vdevs into a root vdev. 3816 */ 3817 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3818 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 3819 VDEV_TYPE_ROOT) == 0); 3820 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 3821 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 3822 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 3823 &nvtop, 1) == 0); 3824 3825 /* 3826 * Replace the existing vdev_tree with the new root vdev in 3827 * this pool's configuration (remove the old, add the new). 3828 */ 3829 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 3830 nvlist_free(nvroot); 3831 return (config); 3832} 3833 3834/* 3835 * Walk the vdev tree and see if we can find a device with "better" 3836 * configuration. A configuration is "better" if the label on that 3837 * device has a more recent txg. 3838 */ 3839static void 3840spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 3841{ 3842 for (int c = 0; c < vd->vdev_children; c++) 3843 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 3844 3845 if (vd->vdev_ops->vdev_op_leaf) { 3846 nvlist_t *label; 3847 uint64_t label_txg; 3848 3849 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 3850 &label) != 0) 3851 return; 3852 3853 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 3854 &label_txg) == 0); 3855 3856 /* 3857 * Do we have a better boot device? 3858 */ 3859 if (label_txg > *txg) { 3860 *txg = label_txg; 3861 *avd = vd; 3862 } 3863 nvlist_free(label); 3864 } 3865} 3866 3867/* 3868 * Import a root pool. 3869 * 3870 * For x86. devpath_list will consist of devid and/or physpath name of 3871 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 3872 * The GRUB "findroot" command will return the vdev we should boot. 3873 * 3874 * For Sparc, devpath_list consists the physpath name of the booting device 3875 * no matter the rootpool is a single device pool or a mirrored pool. 3876 * e.g. 3877 * "/pci@1f,0/ide@d/disk@0,0:a" 3878 */ 3879int 3880spa_import_rootpool(char *devpath, char *devid) 3881{ 3882 spa_t *spa; 3883 vdev_t *rvd, *bvd, *avd = NULL; 3884 nvlist_t *config, *nvtop; 3885 uint64_t guid, txg; 3886 char *pname; 3887 int error; 3888 3889 /* 3890 * Read the label from the boot device and generate a configuration. 3891 */ 3892 config = spa_generate_rootconf(devpath, devid, &guid); 3893#if defined(_OBP) && defined(_KERNEL) 3894 if (config == NULL) { 3895 if (strstr(devpath, "/iscsi/ssd") != NULL) { 3896 /* iscsi boot */ 3897 get_iscsi_bootpath_phy(devpath); 3898 config = spa_generate_rootconf(devpath, devid, &guid); 3899 } 3900 } 3901#endif 3902 if (config == NULL) { 3903 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 3904 devpath); 3905 return (SET_ERROR(EIO)); 3906 } 3907 3908 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 3909 &pname) == 0); 3910 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 3911 3912 mutex_enter(&spa_namespace_lock); 3913 if ((spa = spa_lookup(pname)) != NULL) { 3914 /* 3915 * Remove the existing root pool from the namespace so that we 3916 * can replace it with the correct config we just read in. 3917 */ 3918 spa_remove(spa); 3919 } 3920 3921 spa = spa_add(pname, config, NULL); 3922 spa->spa_is_root = B_TRUE; 3923 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 3924 3925 /* 3926 * Build up a vdev tree based on the boot device's label config. 3927 */ 3928 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3929 &nvtop) == 0); 3930 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3931 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 3932 VDEV_ALLOC_ROOTPOOL); 3933 spa_config_exit(spa, SCL_ALL, FTAG); 3934 if (error) { 3935 mutex_exit(&spa_namespace_lock); 3936 nvlist_free(config); 3937 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 3938 pname); 3939 return (error); 3940 } 3941 3942 /* 3943 * Get the boot vdev. 3944 */ 3945 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 3946 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 3947 (u_longlong_t)guid); 3948 error = SET_ERROR(ENOENT); 3949 goto out; 3950 } 3951 3952 /* 3953 * Determine if there is a better boot device. 3954 */ 3955 avd = bvd; 3956 spa_alt_rootvdev(rvd, &avd, &txg); 3957 if (avd != bvd) { 3958 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 3959 "try booting from '%s'", avd->vdev_path); 3960 error = SET_ERROR(EINVAL); 3961 goto out; 3962 } 3963 3964 /* 3965 * If the boot device is part of a spare vdev then ensure that 3966 * we're booting off the active spare. 3967 */ 3968 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 3969 !bvd->vdev_isspare) { 3970 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 3971 "try booting from '%s'", 3972 bvd->vdev_parent-> 3973 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 3974 error = SET_ERROR(EINVAL); 3975 goto out; 3976 } 3977 3978 error = 0; 3979out: 3980 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3981 vdev_free(rvd); 3982 spa_config_exit(spa, SCL_ALL, FTAG); 3983 mutex_exit(&spa_namespace_lock); 3984 3985 nvlist_free(config); 3986 return (error); 3987} 3988 3989#else 3990 3991extern int vdev_geom_read_pool_label(const char *name, nvlist_t ***configs, 3992 uint64_t *count); 3993 3994static nvlist_t * 3995spa_generate_rootconf(const char *name) 3996{ 3997 nvlist_t **configs, **tops; 3998 nvlist_t *config; 3999 nvlist_t *best_cfg, *nvtop, *nvroot; 4000 uint64_t *holes; 4001 uint64_t best_txg; 4002 uint64_t nchildren; 4003 uint64_t pgid; 4004 uint64_t count; 4005 uint64_t i; 4006 uint_t nholes; 4007 4008 if (vdev_geom_read_pool_label(name, &configs, &count) != 0) 4009 return (NULL); 4010 4011 ASSERT3U(count, !=, 0); 4012 best_txg = 0; 4013 for (i = 0; i < count; i++) { 4014 uint64_t txg; 4015 4016 VERIFY(nvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG, 4017 &txg) == 0); 4018 if (txg > best_txg) { 4019 best_txg = txg; 4020 best_cfg = configs[i]; 4021 } 4022 } 4023 4024 /* 4025 * Multi-vdev root pool configuration discovery is not supported yet. 4026 */ 4027 nchildren = 1; 4028 nvlist_lookup_uint64(best_cfg, ZPOOL_CONFIG_VDEV_CHILDREN, &nchildren); 4029 holes = NULL; 4030 nvlist_lookup_uint64_array(best_cfg, ZPOOL_CONFIG_HOLE_ARRAY, 4031 &holes, &nholes); 4032 4033 tops = kmem_zalloc(nchildren * sizeof(void *), KM_SLEEP); 4034 for (i = 0; i < nchildren; i++) { 4035 if (i >= count) 4036 break; 4037 if (configs[i] == NULL) 4038 continue; 4039 VERIFY(nvlist_lookup_nvlist(configs[i], ZPOOL_CONFIG_VDEV_TREE, 4040 &nvtop) == 0); 4041 nvlist_dup(nvtop, &tops[i], KM_SLEEP); 4042 } 4043 for (i = 0; holes != NULL && i < nholes; i++) { 4044 if (i >= nchildren) 4045 continue; 4046 if (tops[holes[i]] != NULL) 4047 continue; 4048 nvlist_alloc(&tops[holes[i]], NV_UNIQUE_NAME, KM_SLEEP); 4049 VERIFY(nvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE, 4050 VDEV_TYPE_HOLE) == 0); 4051 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID, 4052 holes[i]) == 0); 4053 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID, 4054 0) == 0); 4055 } 4056 for (i = 0; i < nchildren; i++) { 4057 if (tops[i] != NULL) 4058 continue; 4059 nvlist_alloc(&tops[i], NV_UNIQUE_NAME, KM_SLEEP); 4060 VERIFY(nvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE, 4061 VDEV_TYPE_MISSING) == 0); 4062 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID, 4063 i) == 0); 4064 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID, 4065 0) == 0); 4066 } 4067 4068 /* 4069 * Create pool config based on the best vdev config. 4070 */ 4071 nvlist_dup(best_cfg, &config, KM_SLEEP); 4072 4073 /* 4074 * Put this pool's top-level vdevs into a root vdev. 4075 */ 4076 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 4077 &pgid) == 0); 4078 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4079 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 4080 VDEV_TYPE_ROOT) == 0); 4081 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 4082 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 4083 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 4084 tops, nchildren) == 0); 4085 4086 /* 4087 * Replace the existing vdev_tree with the new root vdev in 4088 * this pool's configuration (remove the old, add the new). 4089 */ 4090 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 4091 4092 /* 4093 * Drop vdev config elements that should not be present at pool level. 4094 */ 4095 nvlist_remove(config, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64); 4096 nvlist_remove(config, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64); 4097 4098 for (i = 0; i < count; i++) 4099 nvlist_free(configs[i]); 4100 kmem_free(configs, count * sizeof(void *)); 4101 for (i = 0; i < nchildren; i++) 4102 nvlist_free(tops[i]); 4103 kmem_free(tops, nchildren * sizeof(void *)); 4104 nvlist_free(nvroot); 4105 return (config); 4106} 4107 4108int 4109spa_import_rootpool(const char *name) 4110{ 4111 spa_t *spa; 4112 vdev_t *rvd, *bvd, *avd = NULL; 4113 nvlist_t *config, *nvtop; 4114 uint64_t txg; 4115 char *pname; 4116 int error; 4117 4118 /* 4119 * Read the label from the boot device and generate a configuration. 4120 */ 4121 config = spa_generate_rootconf(name); 4122 4123 mutex_enter(&spa_namespace_lock); 4124 if (config != NULL) { 4125 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 4126 &pname) == 0 && strcmp(name, pname) == 0); 4127 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) 4128 == 0); 4129 4130 if ((spa = spa_lookup(pname)) != NULL) { 4131 /* 4132 * Remove the existing root pool from the namespace so 4133 * that we can replace it with the correct config 4134 * we just read in. 4135 */ 4136 spa_remove(spa); 4137 } 4138 spa = spa_add(pname, config, NULL); 4139 4140 /* 4141 * Set spa_ubsync.ub_version as it can be used in vdev_alloc() 4142 * via spa_version(). 4143 */ 4144 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 4145 &spa->spa_ubsync.ub_version) != 0) 4146 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 4147 } else if ((spa = spa_lookup(name)) == NULL) { 4148 mutex_exit(&spa_namespace_lock); 4149 nvlist_free(config); 4150 cmn_err(CE_NOTE, "Cannot find the pool label for '%s'", 4151 name); 4152 return (EIO); 4153 } else { 4154 VERIFY(nvlist_dup(spa->spa_config, &config, KM_SLEEP) == 0); 4155 } 4156 spa->spa_is_root = B_TRUE; 4157 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 4158 4159 /* 4160 * Build up a vdev tree based on the boot device's label config. 4161 */ 4162 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4163 &nvtop) == 0); 4164 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4165 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 4166 VDEV_ALLOC_ROOTPOOL); 4167 spa_config_exit(spa, SCL_ALL, FTAG); 4168 if (error) { 4169 mutex_exit(&spa_namespace_lock); 4170 nvlist_free(config); 4171 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 4172 pname); 4173 return (error); 4174 } 4175 4176 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4177 vdev_free(rvd); 4178 spa_config_exit(spa, SCL_ALL, FTAG); 4179 mutex_exit(&spa_namespace_lock); 4180 4181 nvlist_free(config); 4182 return (0); 4183} 4184 4185#endif /* sun */ 4186#endif 4187 4188/* 4189 * Import a non-root pool into the system. 4190 */ 4191int 4192spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 4193{ 4194 spa_t *spa; 4195 char *altroot = NULL; 4196 spa_load_state_t state = SPA_LOAD_IMPORT; 4197 zpool_rewind_policy_t policy; 4198 uint64_t mode = spa_mode_global; 4199 uint64_t readonly = B_FALSE; 4200 int error; 4201 nvlist_t *nvroot; 4202 nvlist_t **spares, **l2cache; 4203 uint_t nspares, nl2cache; 4204 4205 /* 4206 * If a pool with this name exists, return failure. 4207 */ 4208 mutex_enter(&spa_namespace_lock); 4209 if (spa_lookup(pool) != NULL) { 4210 mutex_exit(&spa_namespace_lock); 4211 return (SET_ERROR(EEXIST)); 4212 } 4213 4214 /* 4215 * Create and initialize the spa structure. 4216 */ 4217 (void) nvlist_lookup_string(props, 4218 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4219 (void) nvlist_lookup_uint64(props, 4220 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 4221 if (readonly) 4222 mode = FREAD; 4223 spa = spa_add(pool, config, altroot); 4224 spa->spa_import_flags = flags; 4225 4226 /* 4227 * Verbatim import - Take a pool and insert it into the namespace 4228 * as if it had been loaded at boot. 4229 */ 4230 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 4231 if (props != NULL) 4232 spa_configfile_set(spa, props, B_FALSE); 4233 4234 spa_config_sync(spa, B_FALSE, B_TRUE); 4235 4236 mutex_exit(&spa_namespace_lock); 4237 return (0); 4238 } 4239 4240 spa_activate(spa, mode); 4241 4242 /* 4243 * Don't start async tasks until we know everything is healthy. 4244 */ 4245 spa_async_suspend(spa); 4246 4247 zpool_get_rewind_policy(config, &policy); 4248 if (policy.zrp_request & ZPOOL_DO_REWIND) 4249 state = SPA_LOAD_RECOVER; 4250 4251 /* 4252 * Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig 4253 * because the user-supplied config is actually the one to trust when 4254 * doing an import. 4255 */ 4256 if (state != SPA_LOAD_RECOVER) 4257 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4258 4259 error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg, 4260 policy.zrp_request); 4261 4262 /* 4263 * Propagate anything learned while loading the pool and pass it 4264 * back to caller (i.e. rewind info, missing devices, etc). 4265 */ 4266 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4267 spa->spa_load_info) == 0); 4268 4269 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4270 /* 4271 * Toss any existing sparelist, as it doesn't have any validity 4272 * anymore, and conflicts with spa_has_spare(). 4273 */ 4274 if (spa->spa_spares.sav_config) { 4275 nvlist_free(spa->spa_spares.sav_config); 4276 spa->spa_spares.sav_config = NULL; 4277 spa_load_spares(spa); 4278 } 4279 if (spa->spa_l2cache.sav_config) { 4280 nvlist_free(spa->spa_l2cache.sav_config); 4281 spa->spa_l2cache.sav_config = NULL; 4282 spa_load_l2cache(spa); 4283 } 4284 4285 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4286 &nvroot) == 0); 4287 if (error == 0) 4288 error = spa_validate_aux(spa, nvroot, -1ULL, 4289 VDEV_ALLOC_SPARE); 4290 if (error == 0) 4291 error = spa_validate_aux(spa, nvroot, -1ULL, 4292 VDEV_ALLOC_L2CACHE); 4293 spa_config_exit(spa, SCL_ALL, FTAG); 4294 4295 if (props != NULL) 4296 spa_configfile_set(spa, props, B_FALSE); 4297 4298 if (error != 0 || (props && spa_writeable(spa) && 4299 (error = spa_prop_set(spa, props)))) { 4300 spa_unload(spa); 4301 spa_deactivate(spa); 4302 spa_remove(spa); 4303 mutex_exit(&spa_namespace_lock); 4304 return (error); 4305 } 4306 4307 spa_async_resume(spa); 4308 4309 /* 4310 * Override any spares and level 2 cache devices as specified by 4311 * the user, as these may have correct device names/devids, etc. 4312 */ 4313 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4314 &spares, &nspares) == 0) { 4315 if (spa->spa_spares.sav_config) 4316 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 4317 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 4318 else 4319 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 4320 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4321 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4322 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4323 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4324 spa_load_spares(spa); 4325 spa_config_exit(spa, SCL_ALL, FTAG); 4326 spa->spa_spares.sav_sync = B_TRUE; 4327 } 4328 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4329 &l2cache, &nl2cache) == 0) { 4330 if (spa->spa_l2cache.sav_config) 4331 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 4332 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 4333 else 4334 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4335 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4336 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4337 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4338 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4339 spa_load_l2cache(spa); 4340 spa_config_exit(spa, SCL_ALL, FTAG); 4341 spa->spa_l2cache.sav_sync = B_TRUE; 4342 } 4343 4344 /* 4345 * Check for any removed devices. 4346 */ 4347 if (spa->spa_autoreplace) { 4348 spa_aux_check_removed(&spa->spa_spares); 4349 spa_aux_check_removed(&spa->spa_l2cache); 4350 } 4351 4352 if (spa_writeable(spa)) { 4353 /* 4354 * Update the config cache to include the newly-imported pool. 4355 */ 4356 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4357 } 4358 4359 /* 4360 * It's possible that the pool was expanded while it was exported. 4361 * We kick off an async task to handle this for us. 4362 */ 4363 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 4364 4365 mutex_exit(&spa_namespace_lock); 4366 spa_history_log_version(spa, "import"); 4367 4368#ifdef __FreeBSD__ 4369#ifdef _KERNEL 4370 zvol_create_minors(pool); 4371#endif 4372#endif 4373 return (0); 4374} 4375 4376nvlist_t * 4377spa_tryimport(nvlist_t *tryconfig) 4378{ 4379 nvlist_t *config = NULL; 4380 char *poolname; 4381 spa_t *spa; 4382 uint64_t state; 4383 int error; 4384 4385 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 4386 return (NULL); 4387 4388 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 4389 return (NULL); 4390 4391 /* 4392 * Create and initialize the spa structure. 4393 */ 4394 mutex_enter(&spa_namespace_lock); 4395 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 4396 spa_activate(spa, FREAD); 4397 4398 /* 4399 * Pass off the heavy lifting to spa_load(). 4400 * Pass TRUE for mosconfig because the user-supplied config 4401 * is actually the one to trust when doing an import. 4402 */ 4403 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE); 4404 4405 /* 4406 * If 'tryconfig' was at least parsable, return the current config. 4407 */ 4408 if (spa->spa_root_vdev != NULL) { 4409 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4410 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 4411 poolname) == 0); 4412 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 4413 state) == 0); 4414 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 4415 spa->spa_uberblock.ub_timestamp) == 0); 4416 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4417 spa->spa_load_info) == 0); 4418 4419 /* 4420 * If the bootfs property exists on this pool then we 4421 * copy it out so that external consumers can tell which 4422 * pools are bootable. 4423 */ 4424 if ((!error || error == EEXIST) && spa->spa_bootfs) { 4425 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4426 4427 /* 4428 * We have to play games with the name since the 4429 * pool was opened as TRYIMPORT_NAME. 4430 */ 4431 if (dsl_dsobj_to_dsname(spa_name(spa), 4432 spa->spa_bootfs, tmpname) == 0) { 4433 char *cp; 4434 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4435 4436 cp = strchr(tmpname, '/'); 4437 if (cp == NULL) { 4438 (void) strlcpy(dsname, tmpname, 4439 MAXPATHLEN); 4440 } else { 4441 (void) snprintf(dsname, MAXPATHLEN, 4442 "%s/%s", poolname, ++cp); 4443 } 4444 VERIFY(nvlist_add_string(config, 4445 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 4446 kmem_free(dsname, MAXPATHLEN); 4447 } 4448 kmem_free(tmpname, MAXPATHLEN); 4449 } 4450 4451 /* 4452 * Add the list of hot spares and level 2 cache devices. 4453 */ 4454 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4455 spa_add_spares(spa, config); 4456 spa_add_l2cache(spa, config); 4457 spa_config_exit(spa, SCL_CONFIG, FTAG); 4458 } 4459 4460 spa_unload(spa); 4461 spa_deactivate(spa); 4462 spa_remove(spa); 4463 mutex_exit(&spa_namespace_lock); 4464 4465 return (config); 4466} 4467 4468/* 4469 * Pool export/destroy 4470 * 4471 * The act of destroying or exporting a pool is very simple. We make sure there 4472 * is no more pending I/O and any references to the pool are gone. Then, we 4473 * update the pool state and sync all the labels to disk, removing the 4474 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 4475 * we don't sync the labels or remove the configuration cache. 4476 */ 4477static int 4478spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 4479 boolean_t force, boolean_t hardforce) 4480{ 4481 spa_t *spa; 4482 4483 if (oldconfig) 4484 *oldconfig = NULL; 4485 4486 if (!(spa_mode_global & FWRITE)) 4487 return (SET_ERROR(EROFS)); 4488 4489 mutex_enter(&spa_namespace_lock); 4490 if ((spa = spa_lookup(pool)) == NULL) { 4491 mutex_exit(&spa_namespace_lock); 4492 return (SET_ERROR(ENOENT)); 4493 } 4494 4495 /* 4496 * Put a hold on the pool, drop the namespace lock, stop async tasks, 4497 * reacquire the namespace lock, and see if we can export. 4498 */ 4499 spa_open_ref(spa, FTAG); 4500 mutex_exit(&spa_namespace_lock); 4501 spa_async_suspend(spa); 4502 mutex_enter(&spa_namespace_lock); 4503 spa_close(spa, FTAG); 4504 4505 /* 4506 * The pool will be in core if it's openable, 4507 * in which case we can modify its state. 4508 */ 4509 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 4510 /* 4511 * Objsets may be open only because they're dirty, so we 4512 * have to force it to sync before checking spa_refcnt. 4513 */ 4514 txg_wait_synced(spa->spa_dsl_pool, 0); 4515 spa_evicting_os_wait(spa); 4516 4517 /* 4518 * A pool cannot be exported or destroyed if there are active 4519 * references. If we are resetting a pool, allow references by 4520 * fault injection handlers. 4521 */ 4522 if (!spa_refcount_zero(spa) || 4523 (spa->spa_inject_ref != 0 && 4524 new_state != POOL_STATE_UNINITIALIZED)) { 4525 spa_async_resume(spa); 4526 mutex_exit(&spa_namespace_lock); 4527 return (SET_ERROR(EBUSY)); 4528 } 4529 4530 /* 4531 * A pool cannot be exported if it has an active shared spare. 4532 * This is to prevent other pools stealing the active spare 4533 * from an exported pool. At user's own will, such pool can 4534 * be forcedly exported. 4535 */ 4536 if (!force && new_state == POOL_STATE_EXPORTED && 4537 spa_has_active_shared_spare(spa)) { 4538 spa_async_resume(spa); 4539 mutex_exit(&spa_namespace_lock); 4540 return (SET_ERROR(EXDEV)); 4541 } 4542 4543 /* 4544 * We want this to be reflected on every label, 4545 * so mark them all dirty. spa_unload() will do the 4546 * final sync that pushes these changes out. 4547 */ 4548 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 4549 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4550 spa->spa_state = new_state; 4551 spa->spa_final_txg = spa_last_synced_txg(spa) + 4552 TXG_DEFER_SIZE + 1; 4553 vdev_config_dirty(spa->spa_root_vdev); 4554 spa_config_exit(spa, SCL_ALL, FTAG); 4555 } 4556 } 4557 4558 spa_event_notify(spa, NULL, ESC_ZFS_POOL_DESTROY); 4559 4560 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 4561 spa_unload(spa); 4562 spa_deactivate(spa); 4563 } 4564 4565 if (oldconfig && spa->spa_config) 4566 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 4567 4568 if (new_state != POOL_STATE_UNINITIALIZED) { 4569 if (!hardforce) 4570 spa_config_sync(spa, B_TRUE, B_TRUE); 4571 spa_remove(spa); 4572 } 4573 mutex_exit(&spa_namespace_lock); 4574 4575 return (0); 4576} 4577 4578/* 4579 * Destroy a storage pool. 4580 */ 4581int 4582spa_destroy(char *pool) 4583{ 4584 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 4585 B_FALSE, B_FALSE)); 4586} 4587 4588/* 4589 * Export a storage pool. 4590 */ 4591int 4592spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 4593 boolean_t hardforce) 4594{ 4595 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 4596 force, hardforce)); 4597} 4598 4599/* 4600 * Similar to spa_export(), this unloads the spa_t without actually removing it 4601 * from the namespace in any way. 4602 */ 4603int 4604spa_reset(char *pool) 4605{ 4606 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 4607 B_FALSE, B_FALSE)); 4608} 4609 4610/* 4611 * ========================================================================== 4612 * Device manipulation 4613 * ========================================================================== 4614 */ 4615 4616/* 4617 * Add a device to a storage pool. 4618 */ 4619int 4620spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 4621{ 4622 uint64_t txg, id; 4623 int error; 4624 vdev_t *rvd = spa->spa_root_vdev; 4625 vdev_t *vd, *tvd; 4626 nvlist_t **spares, **l2cache; 4627 uint_t nspares, nl2cache; 4628 4629 ASSERT(spa_writeable(spa)); 4630 4631 txg = spa_vdev_enter(spa); 4632 4633 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 4634 VDEV_ALLOC_ADD)) != 0) 4635 return (spa_vdev_exit(spa, NULL, txg, error)); 4636 4637 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 4638 4639 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 4640 &nspares) != 0) 4641 nspares = 0; 4642 4643 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 4644 &nl2cache) != 0) 4645 nl2cache = 0; 4646 4647 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 4648 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 4649 4650 if (vd->vdev_children != 0 && 4651 (error = vdev_create(vd, txg, B_FALSE)) != 0) 4652 return (spa_vdev_exit(spa, vd, txg, error)); 4653 4654 /* 4655 * We must validate the spares and l2cache devices after checking the 4656 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 4657 */ 4658 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 4659 return (spa_vdev_exit(spa, vd, txg, error)); 4660 4661 /* 4662 * Transfer each new top-level vdev from vd to rvd. 4663 */ 4664 for (int c = 0; c < vd->vdev_children; c++) { 4665 4666 /* 4667 * Set the vdev id to the first hole, if one exists. 4668 */ 4669 for (id = 0; id < rvd->vdev_children; id++) { 4670 if (rvd->vdev_child[id]->vdev_ishole) { 4671 vdev_free(rvd->vdev_child[id]); 4672 break; 4673 } 4674 } 4675 tvd = vd->vdev_child[c]; 4676 vdev_remove_child(vd, tvd); 4677 tvd->vdev_id = id; 4678 vdev_add_child(rvd, tvd); 4679 vdev_config_dirty(tvd); 4680 } 4681 4682 if (nspares != 0) { 4683 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 4684 ZPOOL_CONFIG_SPARES); 4685 spa_load_spares(spa); 4686 spa->spa_spares.sav_sync = B_TRUE; 4687 } 4688 4689 if (nl2cache != 0) { 4690 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 4691 ZPOOL_CONFIG_L2CACHE); 4692 spa_load_l2cache(spa); 4693 spa->spa_l2cache.sav_sync = B_TRUE; 4694 } 4695 4696 /* 4697 * We have to be careful when adding new vdevs to an existing pool. 4698 * If other threads start allocating from these vdevs before we 4699 * sync the config cache, and we lose power, then upon reboot we may 4700 * fail to open the pool because there are DVAs that the config cache 4701 * can't translate. Therefore, we first add the vdevs without 4702 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 4703 * and then let spa_config_update() initialize the new metaslabs. 4704 * 4705 * spa_load() checks for added-but-not-initialized vdevs, so that 4706 * if we lose power at any point in this sequence, the remaining 4707 * steps will be completed the next time we load the pool. 4708 */ 4709 (void) spa_vdev_exit(spa, vd, txg, 0); 4710 4711 mutex_enter(&spa_namespace_lock); 4712 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4713 mutex_exit(&spa_namespace_lock); 4714 4715 return (0); 4716} 4717 4718/* 4719 * Attach a device to a mirror. The arguments are the path to any device 4720 * in the mirror, and the nvroot for the new device. If the path specifies 4721 * a device that is not mirrored, we automatically insert the mirror vdev. 4722 * 4723 * If 'replacing' is specified, the new device is intended to replace the 4724 * existing device; in this case the two devices are made into their own 4725 * mirror using the 'replacing' vdev, which is functionally identical to 4726 * the mirror vdev (it actually reuses all the same ops) but has a few 4727 * extra rules: you can't attach to it after it's been created, and upon 4728 * completion of resilvering, the first disk (the one being replaced) 4729 * is automatically detached. 4730 */ 4731int 4732spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 4733{ 4734 uint64_t txg, dtl_max_txg; 4735 vdev_t *rvd = spa->spa_root_vdev; 4736 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 4737 vdev_ops_t *pvops; 4738 char *oldvdpath, *newvdpath; 4739 int newvd_isspare; 4740 int error; 4741 4742 ASSERT(spa_writeable(spa)); 4743 4744 txg = spa_vdev_enter(spa); 4745 4746 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 4747 4748 if (oldvd == NULL) 4749 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4750 4751 if (!oldvd->vdev_ops->vdev_op_leaf) 4752 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4753 4754 pvd = oldvd->vdev_parent; 4755 4756 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 4757 VDEV_ALLOC_ATTACH)) != 0) 4758 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 4759 4760 if (newrootvd->vdev_children != 1) 4761 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4762 4763 newvd = newrootvd->vdev_child[0]; 4764 4765 if (!newvd->vdev_ops->vdev_op_leaf) 4766 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4767 4768 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 4769 return (spa_vdev_exit(spa, newrootvd, txg, error)); 4770 4771 /* 4772 * Spares can't replace logs 4773 */ 4774 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 4775 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4776 4777 if (!replacing) { 4778 /* 4779 * For attach, the only allowable parent is a mirror or the root 4780 * vdev. 4781 */ 4782 if (pvd->vdev_ops != &vdev_mirror_ops && 4783 pvd->vdev_ops != &vdev_root_ops) 4784 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4785 4786 pvops = &vdev_mirror_ops; 4787 } else { 4788 /* 4789 * Active hot spares can only be replaced by inactive hot 4790 * spares. 4791 */ 4792 if (pvd->vdev_ops == &vdev_spare_ops && 4793 oldvd->vdev_isspare && 4794 !spa_has_spare(spa, newvd->vdev_guid)) 4795 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4796 4797 /* 4798 * If the source is a hot spare, and the parent isn't already a 4799 * spare, then we want to create a new hot spare. Otherwise, we 4800 * want to create a replacing vdev. The user is not allowed to 4801 * attach to a spared vdev child unless the 'isspare' state is 4802 * the same (spare replaces spare, non-spare replaces 4803 * non-spare). 4804 */ 4805 if (pvd->vdev_ops == &vdev_replacing_ops && 4806 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 4807 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4808 } else if (pvd->vdev_ops == &vdev_spare_ops && 4809 newvd->vdev_isspare != oldvd->vdev_isspare) { 4810 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4811 } 4812 4813 if (newvd->vdev_isspare) 4814 pvops = &vdev_spare_ops; 4815 else 4816 pvops = &vdev_replacing_ops; 4817 } 4818 4819 /* 4820 * Make sure the new device is big enough. 4821 */ 4822 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 4823 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 4824 4825 /* 4826 * The new device cannot have a higher alignment requirement 4827 * than the top-level vdev. 4828 */ 4829 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 4830 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 4831 4832 /* 4833 * If this is an in-place replacement, update oldvd's path and devid 4834 * to make it distinguishable from newvd, and unopenable from now on. 4835 */ 4836 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 4837 spa_strfree(oldvd->vdev_path); 4838 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 4839 KM_SLEEP); 4840 (void) sprintf(oldvd->vdev_path, "%s/%s", 4841 newvd->vdev_path, "old"); 4842 if (oldvd->vdev_devid != NULL) { 4843 spa_strfree(oldvd->vdev_devid); 4844 oldvd->vdev_devid = NULL; 4845 } 4846 } 4847 4848 /* mark the device being resilvered */ 4849 newvd->vdev_resilver_txg = txg; 4850 4851 /* 4852 * If the parent is not a mirror, or if we're replacing, insert the new 4853 * mirror/replacing/spare vdev above oldvd. 4854 */ 4855 if (pvd->vdev_ops != pvops) 4856 pvd = vdev_add_parent(oldvd, pvops); 4857 4858 ASSERT(pvd->vdev_top->vdev_parent == rvd); 4859 ASSERT(pvd->vdev_ops == pvops); 4860 ASSERT(oldvd->vdev_parent == pvd); 4861 4862 /* 4863 * Extract the new device from its root and add it to pvd. 4864 */ 4865 vdev_remove_child(newrootvd, newvd); 4866 newvd->vdev_id = pvd->vdev_children; 4867 newvd->vdev_crtxg = oldvd->vdev_crtxg; 4868 vdev_add_child(pvd, newvd); 4869 4870 tvd = newvd->vdev_top; 4871 ASSERT(pvd->vdev_top == tvd); 4872 ASSERT(tvd->vdev_parent == rvd); 4873 4874 vdev_config_dirty(tvd); 4875 4876 /* 4877 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 4878 * for any dmu_sync-ed blocks. It will propagate upward when 4879 * spa_vdev_exit() calls vdev_dtl_reassess(). 4880 */ 4881 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 4882 4883 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 4884 dtl_max_txg - TXG_INITIAL); 4885 4886 if (newvd->vdev_isspare) { 4887 spa_spare_activate(newvd); 4888 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE); 4889 } 4890 4891 oldvdpath = spa_strdup(oldvd->vdev_path); 4892 newvdpath = spa_strdup(newvd->vdev_path); 4893 newvd_isspare = newvd->vdev_isspare; 4894 4895 /* 4896 * Mark newvd's DTL dirty in this txg. 4897 */ 4898 vdev_dirty(tvd, VDD_DTL, newvd, txg); 4899 4900 /* 4901 * Schedule the resilver to restart in the future. We do this to 4902 * ensure that dmu_sync-ed blocks have been stitched into the 4903 * respective datasets. 4904 */ 4905 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 4906 4907 /* 4908 * Commit the config 4909 */ 4910 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 4911 4912 spa_history_log_internal(spa, "vdev attach", NULL, 4913 "%s vdev=%s %s vdev=%s", 4914 replacing && newvd_isspare ? "spare in" : 4915 replacing ? "replace" : "attach", newvdpath, 4916 replacing ? "for" : "to", oldvdpath); 4917 4918 spa_strfree(oldvdpath); 4919 spa_strfree(newvdpath); 4920 4921 if (spa->spa_bootfs) 4922 spa_event_notify(spa, newvd, ESC_ZFS_BOOTFS_VDEV_ATTACH); 4923 4924 return (0); 4925} 4926 4927/* 4928 * Detach a device from a mirror or replacing vdev. 4929 * 4930 * If 'replace_done' is specified, only detach if the parent 4931 * is a replacing vdev. 4932 */ 4933int 4934spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 4935{ 4936 uint64_t txg; 4937 int error; 4938 vdev_t *rvd = spa->spa_root_vdev; 4939 vdev_t *vd, *pvd, *cvd, *tvd; 4940 boolean_t unspare = B_FALSE; 4941 uint64_t unspare_guid = 0; 4942 char *vdpath; 4943 4944 ASSERT(spa_writeable(spa)); 4945 4946 txg = spa_vdev_enter(spa); 4947 4948 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 4949 4950 if (vd == NULL) 4951 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4952 4953 if (!vd->vdev_ops->vdev_op_leaf) 4954 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4955 4956 pvd = vd->vdev_parent; 4957 4958 /* 4959 * If the parent/child relationship is not as expected, don't do it. 4960 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 4961 * vdev that's replacing B with C. The user's intent in replacing 4962 * is to go from M(A,B) to M(A,C). If the user decides to cancel 4963 * the replace by detaching C, the expected behavior is to end up 4964 * M(A,B). But suppose that right after deciding to detach C, 4965 * the replacement of B completes. We would have M(A,C), and then 4966 * ask to detach C, which would leave us with just A -- not what 4967 * the user wanted. To prevent this, we make sure that the 4968 * parent/child relationship hasn't changed -- in this example, 4969 * that C's parent is still the replacing vdev R. 4970 */ 4971 if (pvd->vdev_guid != pguid && pguid != 0) 4972 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 4973 4974 /* 4975 * Only 'replacing' or 'spare' vdevs can be replaced. 4976 */ 4977 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 4978 pvd->vdev_ops != &vdev_spare_ops) 4979 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4980 4981 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 4982 spa_version(spa) >= SPA_VERSION_SPARES); 4983 4984 /* 4985 * Only mirror, replacing, and spare vdevs support detach. 4986 */ 4987 if (pvd->vdev_ops != &vdev_replacing_ops && 4988 pvd->vdev_ops != &vdev_mirror_ops && 4989 pvd->vdev_ops != &vdev_spare_ops) 4990 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4991 4992 /* 4993 * If this device has the only valid copy of some data, 4994 * we cannot safely detach it. 4995 */ 4996 if (vdev_dtl_required(vd)) 4997 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 4998 4999 ASSERT(pvd->vdev_children >= 2); 5000 5001 /* 5002 * If we are detaching the second disk from a replacing vdev, then 5003 * check to see if we changed the original vdev's path to have "/old" 5004 * at the end in spa_vdev_attach(). If so, undo that change now. 5005 */ 5006 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 5007 vd->vdev_path != NULL) { 5008 size_t len = strlen(vd->vdev_path); 5009 5010 for (int c = 0; c < pvd->vdev_children; c++) { 5011 cvd = pvd->vdev_child[c]; 5012 5013 if (cvd == vd || cvd->vdev_path == NULL) 5014 continue; 5015 5016 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 5017 strcmp(cvd->vdev_path + len, "/old") == 0) { 5018 spa_strfree(cvd->vdev_path); 5019 cvd->vdev_path = spa_strdup(vd->vdev_path); 5020 break; 5021 } 5022 } 5023 } 5024 5025 /* 5026 * If we are detaching the original disk from a spare, then it implies 5027 * that the spare should become a real disk, and be removed from the 5028 * active spare list for the pool. 5029 */ 5030 if (pvd->vdev_ops == &vdev_spare_ops && 5031 vd->vdev_id == 0 && 5032 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 5033 unspare = B_TRUE; 5034 5035 /* 5036 * Erase the disk labels so the disk can be used for other things. 5037 * This must be done after all other error cases are handled, 5038 * but before we disembowel vd (so we can still do I/O to it). 5039 * But if we can't do it, don't treat the error as fatal -- 5040 * it may be that the unwritability of the disk is the reason 5041 * it's being detached! 5042 */ 5043 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5044 5045 /* 5046 * Remove vd from its parent and compact the parent's children. 5047 */ 5048 vdev_remove_child(pvd, vd); 5049 vdev_compact_children(pvd); 5050 5051 /* 5052 * Remember one of the remaining children so we can get tvd below. 5053 */ 5054 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 5055 5056 /* 5057 * If we need to remove the remaining child from the list of hot spares, 5058 * do it now, marking the vdev as no longer a spare in the process. 5059 * We must do this before vdev_remove_parent(), because that can 5060 * change the GUID if it creates a new toplevel GUID. For a similar 5061 * reason, we must remove the spare now, in the same txg as the detach; 5062 * otherwise someone could attach a new sibling, change the GUID, and 5063 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 5064 */ 5065 if (unspare) { 5066 ASSERT(cvd->vdev_isspare); 5067 spa_spare_remove(cvd); 5068 unspare_guid = cvd->vdev_guid; 5069 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 5070 cvd->vdev_unspare = B_TRUE; 5071 } 5072 5073 /* 5074 * If the parent mirror/replacing vdev only has one child, 5075 * the parent is no longer needed. Remove it from the tree. 5076 */ 5077 if (pvd->vdev_children == 1) { 5078 if (pvd->vdev_ops == &vdev_spare_ops) 5079 cvd->vdev_unspare = B_FALSE; 5080 vdev_remove_parent(cvd); 5081 } 5082 5083 5084 /* 5085 * We don't set tvd until now because the parent we just removed 5086 * may have been the previous top-level vdev. 5087 */ 5088 tvd = cvd->vdev_top; 5089 ASSERT(tvd->vdev_parent == rvd); 5090 5091 /* 5092 * Reevaluate the parent vdev state. 5093 */ 5094 vdev_propagate_state(cvd); 5095 5096 /* 5097 * If the 'autoexpand' property is set on the pool then automatically 5098 * try to expand the size of the pool. For example if the device we 5099 * just detached was smaller than the others, it may be possible to 5100 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 5101 * first so that we can obtain the updated sizes of the leaf vdevs. 5102 */ 5103 if (spa->spa_autoexpand) { 5104 vdev_reopen(tvd); 5105 vdev_expand(tvd, txg); 5106 } 5107 5108 vdev_config_dirty(tvd); 5109 5110 /* 5111 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 5112 * vd->vdev_detached is set and free vd's DTL object in syncing context. 5113 * But first make sure we're not on any *other* txg's DTL list, to 5114 * prevent vd from being accessed after it's freed. 5115 */ 5116 vdpath = spa_strdup(vd->vdev_path); 5117 for (int t = 0; t < TXG_SIZE; t++) 5118 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 5119 vd->vdev_detached = B_TRUE; 5120 vdev_dirty(tvd, VDD_DTL, vd, txg); 5121 5122 spa_event_notify(spa, vd, ESC_ZFS_VDEV_REMOVE); 5123 5124 /* hang on to the spa before we release the lock */ 5125 spa_open_ref(spa, FTAG); 5126 5127 error = spa_vdev_exit(spa, vd, txg, 0); 5128 5129 spa_history_log_internal(spa, "detach", NULL, 5130 "vdev=%s", vdpath); 5131 spa_strfree(vdpath); 5132 5133 /* 5134 * If this was the removal of the original device in a hot spare vdev, 5135 * then we want to go through and remove the device from the hot spare 5136 * list of every other pool. 5137 */ 5138 if (unspare) { 5139 spa_t *altspa = NULL; 5140 5141 mutex_enter(&spa_namespace_lock); 5142 while ((altspa = spa_next(altspa)) != NULL) { 5143 if (altspa->spa_state != POOL_STATE_ACTIVE || 5144 altspa == spa) 5145 continue; 5146 5147 spa_open_ref(altspa, FTAG); 5148 mutex_exit(&spa_namespace_lock); 5149 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 5150 mutex_enter(&spa_namespace_lock); 5151 spa_close(altspa, FTAG); 5152 } 5153 mutex_exit(&spa_namespace_lock); 5154 5155 /* search the rest of the vdevs for spares to remove */ 5156 spa_vdev_resilver_done(spa); 5157 } 5158 5159 /* all done with the spa; OK to release */ 5160 mutex_enter(&spa_namespace_lock); 5161 spa_close(spa, FTAG); 5162 mutex_exit(&spa_namespace_lock); 5163 5164 return (error); 5165} 5166 5167/* 5168 * Split a set of devices from their mirrors, and create a new pool from them. 5169 */ 5170int 5171spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 5172 nvlist_t *props, boolean_t exp) 5173{ 5174 int error = 0; 5175 uint64_t txg, *glist; 5176 spa_t *newspa; 5177 uint_t c, children, lastlog; 5178 nvlist_t **child, *nvl, *tmp; 5179 dmu_tx_t *tx; 5180 char *altroot = NULL; 5181 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 5182 boolean_t activate_slog; 5183 5184 ASSERT(spa_writeable(spa)); 5185 5186 txg = spa_vdev_enter(spa); 5187 5188 /* clear the log and flush everything up to now */ 5189 activate_slog = spa_passivate_log(spa); 5190 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5191 error = spa_offline_log(spa); 5192 txg = spa_vdev_config_enter(spa); 5193 5194 if (activate_slog) 5195 spa_activate_log(spa); 5196 5197 if (error != 0) 5198 return (spa_vdev_exit(spa, NULL, txg, error)); 5199 5200 /* check new spa name before going any further */ 5201 if (spa_lookup(newname) != NULL) 5202 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 5203 5204 /* 5205 * scan through all the children to ensure they're all mirrors 5206 */ 5207 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 5208 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 5209 &children) != 0) 5210 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5211 5212 /* first, check to ensure we've got the right child count */ 5213 rvd = spa->spa_root_vdev; 5214 lastlog = 0; 5215 for (c = 0; c < rvd->vdev_children; c++) { 5216 vdev_t *vd = rvd->vdev_child[c]; 5217 5218 /* don't count the holes & logs as children */ 5219 if (vd->vdev_islog || vd->vdev_ishole) { 5220 if (lastlog == 0) 5221 lastlog = c; 5222 continue; 5223 } 5224 5225 lastlog = 0; 5226 } 5227 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 5228 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5229 5230 /* next, ensure no spare or cache devices are part of the split */ 5231 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 5232 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 5233 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5234 5235 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 5236 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 5237 5238 /* then, loop over each vdev and validate it */ 5239 for (c = 0; c < children; c++) { 5240 uint64_t is_hole = 0; 5241 5242 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 5243 &is_hole); 5244 5245 if (is_hole != 0) { 5246 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 5247 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 5248 continue; 5249 } else { 5250 error = SET_ERROR(EINVAL); 5251 break; 5252 } 5253 } 5254 5255 /* which disk is going to be split? */ 5256 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 5257 &glist[c]) != 0) { 5258 error = SET_ERROR(EINVAL); 5259 break; 5260 } 5261 5262 /* look it up in the spa */ 5263 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 5264 if (vml[c] == NULL) { 5265 error = SET_ERROR(ENODEV); 5266 break; 5267 } 5268 5269 /* make sure there's nothing stopping the split */ 5270 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 5271 vml[c]->vdev_islog || 5272 vml[c]->vdev_ishole || 5273 vml[c]->vdev_isspare || 5274 vml[c]->vdev_isl2cache || 5275 !vdev_writeable(vml[c]) || 5276 vml[c]->vdev_children != 0 || 5277 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 5278 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 5279 error = SET_ERROR(EINVAL); 5280 break; 5281 } 5282 5283 if (vdev_dtl_required(vml[c])) { 5284 error = SET_ERROR(EBUSY); 5285 break; 5286 } 5287 5288 /* we need certain info from the top level */ 5289 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 5290 vml[c]->vdev_top->vdev_ms_array) == 0); 5291 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 5292 vml[c]->vdev_top->vdev_ms_shift) == 0); 5293 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 5294 vml[c]->vdev_top->vdev_asize) == 0); 5295 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 5296 vml[c]->vdev_top->vdev_ashift) == 0); 5297 } 5298 5299 if (error != 0) { 5300 kmem_free(vml, children * sizeof (vdev_t *)); 5301 kmem_free(glist, children * sizeof (uint64_t)); 5302 return (spa_vdev_exit(spa, NULL, txg, error)); 5303 } 5304 5305 /* stop writers from using the disks */ 5306 for (c = 0; c < children; c++) { 5307 if (vml[c] != NULL) 5308 vml[c]->vdev_offline = B_TRUE; 5309 } 5310 vdev_reopen(spa->spa_root_vdev); 5311 5312 /* 5313 * Temporarily record the splitting vdevs in the spa config. This 5314 * will disappear once the config is regenerated. 5315 */ 5316 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5317 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 5318 glist, children) == 0); 5319 kmem_free(glist, children * sizeof (uint64_t)); 5320 5321 mutex_enter(&spa->spa_props_lock); 5322 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 5323 nvl) == 0); 5324 mutex_exit(&spa->spa_props_lock); 5325 spa->spa_config_splitting = nvl; 5326 vdev_config_dirty(spa->spa_root_vdev); 5327 5328 /* configure and create the new pool */ 5329 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 5330 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5331 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 5332 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 5333 spa_version(spa)) == 0); 5334 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 5335 spa->spa_config_txg) == 0); 5336 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 5337 spa_generate_guid(NULL)) == 0); 5338 (void) nvlist_lookup_string(props, 5339 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5340 5341 /* add the new pool to the namespace */ 5342 newspa = spa_add(newname, config, altroot); 5343 newspa->spa_config_txg = spa->spa_config_txg; 5344 spa_set_log_state(newspa, SPA_LOG_CLEAR); 5345 5346 /* release the spa config lock, retaining the namespace lock */ 5347 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5348 5349 if (zio_injection_enabled) 5350 zio_handle_panic_injection(spa, FTAG, 1); 5351 5352 spa_activate(newspa, spa_mode_global); 5353 spa_async_suspend(newspa); 5354 5355#ifndef sun 5356 /* mark that we are creating new spa by splitting */ 5357 newspa->spa_splitting_newspa = B_TRUE; 5358#endif 5359 /* create the new pool from the disks of the original pool */ 5360 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE); 5361#ifndef sun 5362 newspa->spa_splitting_newspa = B_FALSE; 5363#endif 5364 if (error) 5365 goto out; 5366 5367 /* if that worked, generate a real config for the new pool */ 5368 if (newspa->spa_root_vdev != NULL) { 5369 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 5370 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5371 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 5372 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 5373 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 5374 B_TRUE)); 5375 } 5376 5377 /* set the props */ 5378 if (props != NULL) { 5379 spa_configfile_set(newspa, props, B_FALSE); 5380 error = spa_prop_set(newspa, props); 5381 if (error) 5382 goto out; 5383 } 5384 5385 /* flush everything */ 5386 txg = spa_vdev_config_enter(newspa); 5387 vdev_config_dirty(newspa->spa_root_vdev); 5388 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 5389 5390 if (zio_injection_enabled) 5391 zio_handle_panic_injection(spa, FTAG, 2); 5392 5393 spa_async_resume(newspa); 5394 5395 /* finally, update the original pool's config */ 5396 txg = spa_vdev_config_enter(spa); 5397 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 5398 error = dmu_tx_assign(tx, TXG_WAIT); 5399 if (error != 0) 5400 dmu_tx_abort(tx); 5401 for (c = 0; c < children; c++) { 5402 if (vml[c] != NULL) { 5403 vdev_split(vml[c]); 5404 if (error == 0) 5405 spa_history_log_internal(spa, "detach", tx, 5406 "vdev=%s", vml[c]->vdev_path); 5407 vdev_free(vml[c]); 5408 } 5409 } 5410 vdev_config_dirty(spa->spa_root_vdev); 5411 spa->spa_config_splitting = NULL; 5412 nvlist_free(nvl); 5413 if (error == 0) 5414 dmu_tx_commit(tx); 5415 (void) spa_vdev_exit(spa, NULL, txg, 0); 5416 5417 if (zio_injection_enabled) 5418 zio_handle_panic_injection(spa, FTAG, 3); 5419 5420 /* split is complete; log a history record */ 5421 spa_history_log_internal(newspa, "split", NULL, 5422 "from pool %s", spa_name(spa)); 5423 5424 kmem_free(vml, children * sizeof (vdev_t *)); 5425 5426 /* if we're not going to mount the filesystems in userland, export */ 5427 if (exp) 5428 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 5429 B_FALSE, B_FALSE); 5430 5431 return (error); 5432 5433out: 5434 spa_unload(newspa); 5435 spa_deactivate(newspa); 5436 spa_remove(newspa); 5437 5438 txg = spa_vdev_config_enter(spa); 5439 5440 /* re-online all offlined disks */ 5441 for (c = 0; c < children; c++) { 5442 if (vml[c] != NULL) 5443 vml[c]->vdev_offline = B_FALSE; 5444 } 5445 vdev_reopen(spa->spa_root_vdev); 5446 5447 nvlist_free(spa->spa_config_splitting); 5448 spa->spa_config_splitting = NULL; 5449 (void) spa_vdev_exit(spa, NULL, txg, error); 5450 5451 kmem_free(vml, children * sizeof (vdev_t *)); 5452 return (error); 5453} 5454 5455static nvlist_t * 5456spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid) 5457{ 5458 for (int i = 0; i < count; i++) { 5459 uint64_t guid; 5460 5461 VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID, 5462 &guid) == 0); 5463 5464 if (guid == target_guid) 5465 return (nvpp[i]); 5466 } 5467 5468 return (NULL); 5469} 5470 5471static void 5472spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count, 5473 nvlist_t *dev_to_remove) 5474{ 5475 nvlist_t **newdev = NULL; 5476 5477 if (count > 1) 5478 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP); 5479 5480 for (int i = 0, j = 0; i < count; i++) { 5481 if (dev[i] == dev_to_remove) 5482 continue; 5483 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0); 5484 } 5485 5486 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0); 5487 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0); 5488 5489 for (int i = 0; i < count - 1; i++) 5490 nvlist_free(newdev[i]); 5491 5492 if (count > 1) 5493 kmem_free(newdev, (count - 1) * sizeof (void *)); 5494} 5495 5496/* 5497 * Evacuate the device. 5498 */ 5499static int 5500spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd) 5501{ 5502 uint64_t txg; 5503 int error = 0; 5504 5505 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5506 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5507 ASSERT(vd == vd->vdev_top); 5508 5509 /* 5510 * Evacuate the device. We don't hold the config lock as writer 5511 * since we need to do I/O but we do keep the 5512 * spa_namespace_lock held. Once this completes the device 5513 * should no longer have any blocks allocated on it. 5514 */ 5515 if (vd->vdev_islog) { 5516 if (vd->vdev_stat.vs_alloc != 0) 5517 error = spa_offline_log(spa); 5518 } else { 5519 error = SET_ERROR(ENOTSUP); 5520 } 5521 5522 if (error) 5523 return (error); 5524 5525 /* 5526 * The evacuation succeeded. Remove any remaining MOS metadata 5527 * associated with this vdev, and wait for these changes to sync. 5528 */ 5529 ASSERT0(vd->vdev_stat.vs_alloc); 5530 txg = spa_vdev_config_enter(spa); 5531 vd->vdev_removing = B_TRUE; 5532 vdev_dirty_leaves(vd, VDD_DTL, txg); 5533 vdev_config_dirty(vd); 5534 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5535 5536 return (0); 5537} 5538 5539/* 5540 * Complete the removal by cleaning up the namespace. 5541 */ 5542static void 5543spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd) 5544{ 5545 vdev_t *rvd = spa->spa_root_vdev; 5546 uint64_t id = vd->vdev_id; 5547 boolean_t last_vdev = (id == (rvd->vdev_children - 1)); 5548 5549 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5550 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 5551 ASSERT(vd == vd->vdev_top); 5552 5553 /* 5554 * Only remove any devices which are empty. 5555 */ 5556 if (vd->vdev_stat.vs_alloc != 0) 5557 return; 5558 5559 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5560 5561 if (list_link_active(&vd->vdev_state_dirty_node)) 5562 vdev_state_clean(vd); 5563 if (list_link_active(&vd->vdev_config_dirty_node)) 5564 vdev_config_clean(vd); 5565 5566 vdev_free(vd); 5567 5568 if (last_vdev) { 5569 vdev_compact_children(rvd); 5570 } else { 5571 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops); 5572 vdev_add_child(rvd, vd); 5573 } 5574 vdev_config_dirty(rvd); 5575 5576 /* 5577 * Reassess the health of our root vdev. 5578 */ 5579 vdev_reopen(rvd); 5580} 5581 5582/* 5583 * Remove a device from the pool - 5584 * 5585 * Removing a device from the vdev namespace requires several steps 5586 * and can take a significant amount of time. As a result we use 5587 * the spa_vdev_config_[enter/exit] functions which allow us to 5588 * grab and release the spa_config_lock while still holding the namespace 5589 * lock. During each step the configuration is synced out. 5590 * 5591 * Currently, this supports removing only hot spares, slogs, and level 2 ARC 5592 * devices. 5593 */ 5594int 5595spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare) 5596{ 5597 vdev_t *vd; 5598 metaslab_group_t *mg; 5599 nvlist_t **spares, **l2cache, *nv; 5600 uint64_t txg = 0; 5601 uint_t nspares, nl2cache; 5602 int error = 0; 5603 boolean_t locked = MUTEX_HELD(&spa_namespace_lock); 5604 5605 ASSERT(spa_writeable(spa)); 5606 5607 if (!locked) 5608 txg = spa_vdev_enter(spa); 5609 5610 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5611 5612 if (spa->spa_spares.sav_vdevs != NULL && 5613 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 5614 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 && 5615 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) { 5616 /* 5617 * Only remove the hot spare if it's not currently in use 5618 * in this pool. 5619 */ 5620 if (vd == NULL || unspare) { 5621 spa_vdev_remove_aux(spa->spa_spares.sav_config, 5622 ZPOOL_CONFIG_SPARES, spares, nspares, nv); 5623 spa_load_spares(spa); 5624 spa->spa_spares.sav_sync = B_TRUE; 5625 } else { 5626 error = SET_ERROR(EBUSY); 5627 } 5628 } else if (spa->spa_l2cache.sav_vdevs != NULL && 5629 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 5630 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 && 5631 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) { 5632 /* 5633 * Cache devices can always be removed. 5634 */ 5635 spa_vdev_remove_aux(spa->spa_l2cache.sav_config, 5636 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv); 5637 spa_load_l2cache(spa); 5638 spa->spa_l2cache.sav_sync = B_TRUE; 5639 } else if (vd != NULL && vd->vdev_islog) { 5640 ASSERT(!locked); 5641 ASSERT(vd == vd->vdev_top); 5642 5643 mg = vd->vdev_mg; 5644 5645 /* 5646 * Stop allocating from this vdev. 5647 */ 5648 metaslab_group_passivate(mg); 5649 5650 /* 5651 * Wait for the youngest allocations and frees to sync, 5652 * and then wait for the deferral of those frees to finish. 5653 */ 5654 spa_vdev_config_exit(spa, NULL, 5655 txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG); 5656 5657 /* 5658 * Attempt to evacuate the vdev. 5659 */ 5660 error = spa_vdev_remove_evacuate(spa, vd); 5661 5662 txg = spa_vdev_config_enter(spa); 5663 5664 /* 5665 * If we couldn't evacuate the vdev, unwind. 5666 */ 5667 if (error) { 5668 metaslab_group_activate(mg); 5669 return (spa_vdev_exit(spa, NULL, txg, error)); 5670 } 5671 5672 /* 5673 * Clean up the vdev namespace. 5674 */ 5675 spa_vdev_remove_from_namespace(spa, vd); 5676 5677 } else if (vd != NULL) { 5678 /* 5679 * Normal vdevs cannot be removed (yet). 5680 */ 5681 error = SET_ERROR(ENOTSUP); 5682 } else { 5683 /* 5684 * There is no vdev of any kind with the specified guid. 5685 */ 5686 error = SET_ERROR(ENOENT); 5687 } 5688 5689 if (!locked) 5690 return (spa_vdev_exit(spa, NULL, txg, error)); 5691 5692 return (error); 5693} 5694 5695/* 5696 * Find any device that's done replacing, or a vdev marked 'unspare' that's 5697 * currently spared, so we can detach it. 5698 */ 5699static vdev_t * 5700spa_vdev_resilver_done_hunt(vdev_t *vd) 5701{ 5702 vdev_t *newvd, *oldvd; 5703 5704 for (int c = 0; c < vd->vdev_children; c++) { 5705 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 5706 if (oldvd != NULL) 5707 return (oldvd); 5708 } 5709 5710 /* 5711 * Check for a completed replacement. We always consider the first 5712 * vdev in the list to be the oldest vdev, and the last one to be 5713 * the newest (see spa_vdev_attach() for how that works). In 5714 * the case where the newest vdev is faulted, we will not automatically 5715 * remove it after a resilver completes. This is OK as it will require 5716 * user intervention to determine which disk the admin wishes to keep. 5717 */ 5718 if (vd->vdev_ops == &vdev_replacing_ops) { 5719 ASSERT(vd->vdev_children > 1); 5720 5721 newvd = vd->vdev_child[vd->vdev_children - 1]; 5722 oldvd = vd->vdev_child[0]; 5723 5724 if (vdev_dtl_empty(newvd, DTL_MISSING) && 5725 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5726 !vdev_dtl_required(oldvd)) 5727 return (oldvd); 5728 } 5729 5730 /* 5731 * Check for a completed resilver with the 'unspare' flag set. 5732 */ 5733 if (vd->vdev_ops == &vdev_spare_ops) { 5734 vdev_t *first = vd->vdev_child[0]; 5735 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 5736 5737 if (last->vdev_unspare) { 5738 oldvd = first; 5739 newvd = last; 5740 } else if (first->vdev_unspare) { 5741 oldvd = last; 5742 newvd = first; 5743 } else { 5744 oldvd = NULL; 5745 } 5746 5747 if (oldvd != NULL && 5748 vdev_dtl_empty(newvd, DTL_MISSING) && 5749 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5750 !vdev_dtl_required(oldvd)) 5751 return (oldvd); 5752 5753 /* 5754 * If there are more than two spares attached to a disk, 5755 * and those spares are not required, then we want to 5756 * attempt to free them up now so that they can be used 5757 * by other pools. Once we're back down to a single 5758 * disk+spare, we stop removing them. 5759 */ 5760 if (vd->vdev_children > 2) { 5761 newvd = vd->vdev_child[1]; 5762 5763 if (newvd->vdev_isspare && last->vdev_isspare && 5764 vdev_dtl_empty(last, DTL_MISSING) && 5765 vdev_dtl_empty(last, DTL_OUTAGE) && 5766 !vdev_dtl_required(newvd)) 5767 return (newvd); 5768 } 5769 } 5770 5771 return (NULL); 5772} 5773 5774static void 5775spa_vdev_resilver_done(spa_t *spa) 5776{ 5777 vdev_t *vd, *pvd, *ppvd; 5778 uint64_t guid, sguid, pguid, ppguid; 5779 5780 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5781 5782 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 5783 pvd = vd->vdev_parent; 5784 ppvd = pvd->vdev_parent; 5785 guid = vd->vdev_guid; 5786 pguid = pvd->vdev_guid; 5787 ppguid = ppvd->vdev_guid; 5788 sguid = 0; 5789 /* 5790 * If we have just finished replacing a hot spared device, then 5791 * we need to detach the parent's first child (the original hot 5792 * spare) as well. 5793 */ 5794 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 5795 ppvd->vdev_children == 2) { 5796 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 5797 sguid = ppvd->vdev_child[1]->vdev_guid; 5798 } 5799 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 5800 5801 spa_config_exit(spa, SCL_ALL, FTAG); 5802 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 5803 return; 5804 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 5805 return; 5806 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5807 } 5808 5809 spa_config_exit(spa, SCL_ALL, FTAG); 5810} 5811 5812/* 5813 * Update the stored path or FRU for this vdev. 5814 */ 5815int 5816spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 5817 boolean_t ispath) 5818{ 5819 vdev_t *vd; 5820 boolean_t sync = B_FALSE; 5821 5822 ASSERT(spa_writeable(spa)); 5823 5824 spa_vdev_state_enter(spa, SCL_ALL); 5825 5826 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 5827 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 5828 5829 if (!vd->vdev_ops->vdev_op_leaf) 5830 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 5831 5832 if (ispath) { 5833 if (strcmp(value, vd->vdev_path) != 0) { 5834 spa_strfree(vd->vdev_path); 5835 vd->vdev_path = spa_strdup(value); 5836 sync = B_TRUE; 5837 } 5838 } else { 5839 if (vd->vdev_fru == NULL) { 5840 vd->vdev_fru = spa_strdup(value); 5841 sync = B_TRUE; 5842 } else if (strcmp(value, vd->vdev_fru) != 0) { 5843 spa_strfree(vd->vdev_fru); 5844 vd->vdev_fru = spa_strdup(value); 5845 sync = B_TRUE; 5846 } 5847 } 5848 5849 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 5850} 5851 5852int 5853spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 5854{ 5855 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 5856} 5857 5858int 5859spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 5860{ 5861 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 5862} 5863 5864/* 5865 * ========================================================================== 5866 * SPA Scanning 5867 * ========================================================================== 5868 */ 5869 5870int 5871spa_scan_stop(spa_t *spa) 5872{ 5873 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5874 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 5875 return (SET_ERROR(EBUSY)); 5876 return (dsl_scan_cancel(spa->spa_dsl_pool)); 5877} 5878 5879int 5880spa_scan(spa_t *spa, pool_scan_func_t func) 5881{ 5882 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5883 5884 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 5885 return (SET_ERROR(ENOTSUP)); 5886 5887 /* 5888 * If a resilver was requested, but there is no DTL on a 5889 * writeable leaf device, we have nothing to do. 5890 */ 5891 if (func == POOL_SCAN_RESILVER && 5892 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 5893 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 5894 return (0); 5895 } 5896 5897 return (dsl_scan(spa->spa_dsl_pool, func)); 5898} 5899 5900/* 5901 * ========================================================================== 5902 * SPA async task processing 5903 * ========================================================================== 5904 */ 5905 5906static void 5907spa_async_remove(spa_t *spa, vdev_t *vd) 5908{ 5909 if (vd->vdev_remove_wanted) { 5910 vd->vdev_remove_wanted = B_FALSE; 5911 vd->vdev_delayed_close = B_FALSE; 5912 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 5913 5914 /* 5915 * We want to clear the stats, but we don't want to do a full 5916 * vdev_clear() as that will cause us to throw away 5917 * degraded/faulted state as well as attempt to reopen the 5918 * device, all of which is a waste. 5919 */ 5920 vd->vdev_stat.vs_read_errors = 0; 5921 vd->vdev_stat.vs_write_errors = 0; 5922 vd->vdev_stat.vs_checksum_errors = 0; 5923 5924 vdev_state_dirty(vd->vdev_top); 5925 } 5926 5927 for (int c = 0; c < vd->vdev_children; c++) 5928 spa_async_remove(spa, vd->vdev_child[c]); 5929} 5930 5931static void 5932spa_async_probe(spa_t *spa, vdev_t *vd) 5933{ 5934 if (vd->vdev_probe_wanted) { 5935 vd->vdev_probe_wanted = B_FALSE; 5936 vdev_reopen(vd); /* vdev_open() does the actual probe */ 5937 } 5938 5939 for (int c = 0; c < vd->vdev_children; c++) 5940 spa_async_probe(spa, vd->vdev_child[c]); 5941} 5942 5943static void 5944spa_async_autoexpand(spa_t *spa, vdev_t *vd) 5945{ 5946 sysevent_id_t eid; 5947 nvlist_t *attr; 5948 char *physpath; 5949 5950 if (!spa->spa_autoexpand) 5951 return; 5952 5953 for (int c = 0; c < vd->vdev_children; c++) { 5954 vdev_t *cvd = vd->vdev_child[c]; 5955 spa_async_autoexpand(spa, cvd); 5956 } 5957 5958 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 5959 return; 5960 5961 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 5962 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 5963 5964 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5965 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 5966 5967 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 5968 ESC_ZFS_VDEV_AUTOEXPAND, attr, &eid, DDI_SLEEP); 5969 5970 nvlist_free(attr); 5971 kmem_free(physpath, MAXPATHLEN); 5972} 5973 5974static void 5975spa_async_thread(void *arg) 5976{ 5977 spa_t *spa = arg; 5978 int tasks; 5979 5980 ASSERT(spa->spa_sync_on); 5981 5982 mutex_enter(&spa->spa_async_lock); 5983 tasks = spa->spa_async_tasks; 5984 spa->spa_async_tasks &= SPA_ASYNC_REMOVE; 5985 mutex_exit(&spa->spa_async_lock); 5986 5987 /* 5988 * See if the config needs to be updated. 5989 */ 5990 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 5991 uint64_t old_space, new_space; 5992 5993 mutex_enter(&spa_namespace_lock); 5994 old_space = metaslab_class_get_space(spa_normal_class(spa)); 5995 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 5996 new_space = metaslab_class_get_space(spa_normal_class(spa)); 5997 mutex_exit(&spa_namespace_lock); 5998 5999 /* 6000 * If the pool grew as a result of the config update, 6001 * then log an internal history event. 6002 */ 6003 if (new_space != old_space) { 6004 spa_history_log_internal(spa, "vdev online", NULL, 6005 "pool '%s' size: %llu(+%llu)", 6006 spa_name(spa), new_space, new_space - old_space); 6007 } 6008 } 6009 6010 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 6011 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6012 spa_async_autoexpand(spa, spa->spa_root_vdev); 6013 spa_config_exit(spa, SCL_CONFIG, FTAG); 6014 } 6015 6016 /* 6017 * See if any devices need to be probed. 6018 */ 6019 if (tasks & SPA_ASYNC_PROBE) { 6020 spa_vdev_state_enter(spa, SCL_NONE); 6021 spa_async_probe(spa, spa->spa_root_vdev); 6022 (void) spa_vdev_state_exit(spa, NULL, 0); 6023 } 6024 6025 /* 6026 * If any devices are done replacing, detach them. 6027 */ 6028 if (tasks & SPA_ASYNC_RESILVER_DONE) 6029 spa_vdev_resilver_done(spa); 6030 6031 /* 6032 * Kick off a resilver. 6033 */ 6034 if (tasks & SPA_ASYNC_RESILVER) 6035 dsl_resilver_restart(spa->spa_dsl_pool, 0); 6036 6037 /* 6038 * Let the world know that we're done. 6039 */ 6040 mutex_enter(&spa->spa_async_lock); 6041 spa->spa_async_thread = NULL; 6042 cv_broadcast(&spa->spa_async_cv); 6043 mutex_exit(&spa->spa_async_lock); 6044 thread_exit(); 6045} 6046 6047static void 6048spa_async_thread_vd(void *arg) 6049{ 6050 spa_t *spa = arg; 6051 int tasks; 6052 6053 ASSERT(spa->spa_sync_on); 6054 6055 mutex_enter(&spa->spa_async_lock); 6056 tasks = spa->spa_async_tasks; 6057retry: 6058 spa->spa_async_tasks &= ~SPA_ASYNC_REMOVE; 6059 mutex_exit(&spa->spa_async_lock); 6060 6061 /* 6062 * See if any devices need to be marked REMOVED. 6063 */ 6064 if (tasks & SPA_ASYNC_REMOVE) { 6065 spa_vdev_state_enter(spa, SCL_NONE); 6066 spa_async_remove(spa, spa->spa_root_vdev); 6067 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 6068 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 6069 for (int i = 0; i < spa->spa_spares.sav_count; i++) 6070 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 6071 (void) spa_vdev_state_exit(spa, NULL, 0); 6072 } 6073 6074 /* 6075 * Let the world know that we're done. 6076 */ 6077 mutex_enter(&spa->spa_async_lock); 6078 tasks = spa->spa_async_tasks; 6079 if ((tasks & SPA_ASYNC_REMOVE) != 0) 6080 goto retry; 6081 spa->spa_async_thread_vd = NULL; 6082 cv_broadcast(&spa->spa_async_cv); 6083 mutex_exit(&spa->spa_async_lock); 6084 thread_exit(); 6085} 6086 6087void 6088spa_async_suspend(spa_t *spa) 6089{ 6090 mutex_enter(&spa->spa_async_lock); 6091 spa->spa_async_suspended++; 6092 while (spa->spa_async_thread != NULL && 6093 spa->spa_async_thread_vd != NULL) 6094 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 6095 mutex_exit(&spa->spa_async_lock); 6096} 6097 6098void 6099spa_async_resume(spa_t *spa) 6100{ 6101 mutex_enter(&spa->spa_async_lock); 6102 ASSERT(spa->spa_async_suspended != 0); 6103 spa->spa_async_suspended--; 6104 mutex_exit(&spa->spa_async_lock); 6105} 6106 6107static boolean_t 6108spa_async_tasks_pending(spa_t *spa) 6109{ 6110 uint_t non_config_tasks; 6111 uint_t config_task; 6112 boolean_t config_task_suspended; 6113 6114 non_config_tasks = spa->spa_async_tasks & ~(SPA_ASYNC_CONFIG_UPDATE | 6115 SPA_ASYNC_REMOVE); 6116 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 6117 if (spa->spa_ccw_fail_time == 0) { 6118 config_task_suspended = B_FALSE; 6119 } else { 6120 config_task_suspended = 6121 (gethrtime() - spa->spa_ccw_fail_time) < 6122 (zfs_ccw_retry_interval * NANOSEC); 6123 } 6124 6125 return (non_config_tasks || (config_task && !config_task_suspended)); 6126} 6127 6128static void 6129spa_async_dispatch(spa_t *spa) 6130{ 6131 mutex_enter(&spa->spa_async_lock); 6132 if (spa_async_tasks_pending(spa) && 6133 !spa->spa_async_suspended && 6134 spa->spa_async_thread == NULL && 6135 rootdir != NULL) 6136 spa->spa_async_thread = thread_create(NULL, 0, 6137 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 6138 mutex_exit(&spa->spa_async_lock); 6139} 6140 6141static void 6142spa_async_dispatch_vd(spa_t *spa) 6143{ 6144 mutex_enter(&spa->spa_async_lock); 6145 if ((spa->spa_async_tasks & SPA_ASYNC_REMOVE) != 0 && 6146 !spa->spa_async_suspended && 6147 spa->spa_async_thread_vd == NULL && 6148 rootdir != NULL) 6149 spa->spa_async_thread_vd = thread_create(NULL, 0, 6150 spa_async_thread_vd, spa, 0, &p0, TS_RUN, maxclsyspri); 6151 mutex_exit(&spa->spa_async_lock); 6152} 6153 6154void 6155spa_async_request(spa_t *spa, int task) 6156{ 6157 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 6158 mutex_enter(&spa->spa_async_lock); 6159 spa->spa_async_tasks |= task; 6160 mutex_exit(&spa->spa_async_lock); 6161 spa_async_dispatch_vd(spa); 6162} 6163 6164/* 6165 * ========================================================================== 6166 * SPA syncing routines 6167 * ========================================================================== 6168 */ 6169 6170static int 6171bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6172{ 6173 bpobj_t *bpo = arg; 6174 bpobj_enqueue(bpo, bp, tx); 6175 return (0); 6176} 6177 6178static int 6179spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6180{ 6181 zio_t *zio = arg; 6182 6183 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 6184 BP_GET_PSIZE(bp), zio->io_flags)); 6185 return (0); 6186} 6187 6188/* 6189 * Note: this simple function is not inlined to make it easier to dtrace the 6190 * amount of time spent syncing frees. 6191 */ 6192static void 6193spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 6194{ 6195 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6196 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 6197 VERIFY(zio_wait(zio) == 0); 6198} 6199 6200/* 6201 * Note: this simple function is not inlined to make it easier to dtrace the 6202 * amount of time spent syncing deferred frees. 6203 */ 6204static void 6205spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 6206{ 6207 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6208 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 6209 spa_free_sync_cb, zio, tx), ==, 0); 6210 VERIFY0(zio_wait(zio)); 6211} 6212 6213 6214static void 6215spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 6216{ 6217 char *packed = NULL; 6218 size_t bufsize; 6219 size_t nvsize = 0; 6220 dmu_buf_t *db; 6221 6222 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 6223 6224 /* 6225 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 6226 * information. This avoids the dmu_buf_will_dirty() path and 6227 * saves us a pre-read to get data we don't actually care about. 6228 */ 6229 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 6230 packed = kmem_alloc(bufsize, KM_SLEEP); 6231 6232 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 6233 KM_SLEEP) == 0); 6234 bzero(packed + nvsize, bufsize - nvsize); 6235 6236 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 6237 6238 kmem_free(packed, bufsize); 6239 6240 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 6241 dmu_buf_will_dirty(db, tx); 6242 *(uint64_t *)db->db_data = nvsize; 6243 dmu_buf_rele(db, FTAG); 6244} 6245 6246static void 6247spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 6248 const char *config, const char *entry) 6249{ 6250 nvlist_t *nvroot; 6251 nvlist_t **list; 6252 int i; 6253 6254 if (!sav->sav_sync) 6255 return; 6256 6257 /* 6258 * Update the MOS nvlist describing the list of available devices. 6259 * spa_validate_aux() will have already made sure this nvlist is 6260 * valid and the vdevs are labeled appropriately. 6261 */ 6262 if (sav->sav_object == 0) { 6263 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 6264 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 6265 sizeof (uint64_t), tx); 6266 VERIFY(zap_update(spa->spa_meta_objset, 6267 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 6268 &sav->sav_object, tx) == 0); 6269 } 6270 6271 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6272 if (sav->sav_count == 0) { 6273 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 6274 } else { 6275 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 6276 for (i = 0; i < sav->sav_count; i++) 6277 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 6278 B_FALSE, VDEV_CONFIG_L2CACHE); 6279 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 6280 sav->sav_count) == 0); 6281 for (i = 0; i < sav->sav_count; i++) 6282 nvlist_free(list[i]); 6283 kmem_free(list, sav->sav_count * sizeof (void *)); 6284 } 6285 6286 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 6287 nvlist_free(nvroot); 6288 6289 sav->sav_sync = B_FALSE; 6290} 6291 6292static void 6293spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 6294{ 6295 nvlist_t *config; 6296 6297 if (list_is_empty(&spa->spa_config_dirty_list)) 6298 return; 6299 6300 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6301 6302 config = spa_config_generate(spa, spa->spa_root_vdev, 6303 dmu_tx_get_txg(tx), B_FALSE); 6304 6305 /* 6306 * If we're upgrading the spa version then make sure that 6307 * the config object gets updated with the correct version. 6308 */ 6309 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 6310 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6311 spa->spa_uberblock.ub_version); 6312 6313 spa_config_exit(spa, SCL_STATE, FTAG); 6314 6315 if (spa->spa_config_syncing) 6316 nvlist_free(spa->spa_config_syncing); 6317 spa->spa_config_syncing = config; 6318 6319 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 6320} 6321 6322static void 6323spa_sync_version(void *arg, dmu_tx_t *tx) 6324{ 6325 uint64_t *versionp = arg; 6326 uint64_t version = *versionp; 6327 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6328 6329 /* 6330 * Setting the version is special cased when first creating the pool. 6331 */ 6332 ASSERT(tx->tx_txg != TXG_INITIAL); 6333 6334 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 6335 ASSERT(version >= spa_version(spa)); 6336 6337 spa->spa_uberblock.ub_version = version; 6338 vdev_config_dirty(spa->spa_root_vdev); 6339 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 6340} 6341 6342/* 6343 * Set zpool properties. 6344 */ 6345static void 6346spa_sync_props(void *arg, dmu_tx_t *tx) 6347{ 6348 nvlist_t *nvp = arg; 6349 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6350 objset_t *mos = spa->spa_meta_objset; 6351 nvpair_t *elem = NULL; 6352 6353 mutex_enter(&spa->spa_props_lock); 6354 6355 while ((elem = nvlist_next_nvpair(nvp, elem))) { 6356 uint64_t intval; 6357 char *strval, *fname; 6358 zpool_prop_t prop; 6359 const char *propname; 6360 zprop_type_t proptype; 6361 spa_feature_t fid; 6362 6363 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 6364 case ZPROP_INVAL: 6365 /* 6366 * We checked this earlier in spa_prop_validate(). 6367 */ 6368 ASSERT(zpool_prop_feature(nvpair_name(elem))); 6369 6370 fname = strchr(nvpair_name(elem), '@') + 1; 6371 VERIFY0(zfeature_lookup_name(fname, &fid)); 6372 6373 spa_feature_enable(spa, fid, tx); 6374 spa_history_log_internal(spa, "set", tx, 6375 "%s=enabled", nvpair_name(elem)); 6376 break; 6377 6378 case ZPOOL_PROP_VERSION: 6379 intval = fnvpair_value_uint64(elem); 6380 /* 6381 * The version is synced seperatly before other 6382 * properties and should be correct by now. 6383 */ 6384 ASSERT3U(spa_version(spa), >=, intval); 6385 break; 6386 6387 case ZPOOL_PROP_ALTROOT: 6388 /* 6389 * 'altroot' is a non-persistent property. It should 6390 * have been set temporarily at creation or import time. 6391 */ 6392 ASSERT(spa->spa_root != NULL); 6393 break; 6394 6395 case ZPOOL_PROP_READONLY: 6396 case ZPOOL_PROP_CACHEFILE: 6397 /* 6398 * 'readonly' and 'cachefile' are also non-persisitent 6399 * properties. 6400 */ 6401 break; 6402 case ZPOOL_PROP_COMMENT: 6403 strval = fnvpair_value_string(elem); 6404 if (spa->spa_comment != NULL) 6405 spa_strfree(spa->spa_comment); 6406 spa->spa_comment = spa_strdup(strval); 6407 /* 6408 * We need to dirty the configuration on all the vdevs 6409 * so that their labels get updated. It's unnecessary 6410 * to do this for pool creation since the vdev's 6411 * configuratoin has already been dirtied. 6412 */ 6413 if (tx->tx_txg != TXG_INITIAL) 6414 vdev_config_dirty(spa->spa_root_vdev); 6415 spa_history_log_internal(spa, "set", tx, 6416 "%s=%s", nvpair_name(elem), strval); 6417 break; 6418 default: 6419 /* 6420 * Set pool property values in the poolprops mos object. 6421 */ 6422 if (spa->spa_pool_props_object == 0) { 6423 spa->spa_pool_props_object = 6424 zap_create_link(mos, DMU_OT_POOL_PROPS, 6425 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 6426 tx); 6427 } 6428 6429 /* normalize the property name */ 6430 propname = zpool_prop_to_name(prop); 6431 proptype = zpool_prop_get_type(prop); 6432 6433 if (nvpair_type(elem) == DATA_TYPE_STRING) { 6434 ASSERT(proptype == PROP_TYPE_STRING); 6435 strval = fnvpair_value_string(elem); 6436 VERIFY0(zap_update(mos, 6437 spa->spa_pool_props_object, propname, 6438 1, strlen(strval) + 1, strval, tx)); 6439 spa_history_log_internal(spa, "set", tx, 6440 "%s=%s", nvpair_name(elem), strval); 6441 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 6442 intval = fnvpair_value_uint64(elem); 6443 6444 if (proptype == PROP_TYPE_INDEX) { 6445 const char *unused; 6446 VERIFY0(zpool_prop_index_to_string( 6447 prop, intval, &unused)); 6448 } 6449 VERIFY0(zap_update(mos, 6450 spa->spa_pool_props_object, propname, 6451 8, 1, &intval, tx)); 6452 spa_history_log_internal(spa, "set", tx, 6453 "%s=%lld", nvpair_name(elem), intval); 6454 } else { 6455 ASSERT(0); /* not allowed */ 6456 } 6457 6458 switch (prop) { 6459 case ZPOOL_PROP_DELEGATION: 6460 spa->spa_delegation = intval; 6461 break; 6462 case ZPOOL_PROP_BOOTFS: 6463 spa->spa_bootfs = intval; 6464 break; 6465 case ZPOOL_PROP_FAILUREMODE: 6466 spa->spa_failmode = intval; 6467 break; 6468 case ZPOOL_PROP_AUTOEXPAND: 6469 spa->spa_autoexpand = intval; 6470 if (tx->tx_txg != TXG_INITIAL) 6471 spa_async_request(spa, 6472 SPA_ASYNC_AUTOEXPAND); 6473 break; 6474 case ZPOOL_PROP_DEDUPDITTO: 6475 spa->spa_dedup_ditto = intval; 6476 break; 6477 default: 6478 break; 6479 } 6480 } 6481 6482 } 6483 6484 mutex_exit(&spa->spa_props_lock); 6485} 6486 6487/* 6488 * Perform one-time upgrade on-disk changes. spa_version() does not 6489 * reflect the new version this txg, so there must be no changes this 6490 * txg to anything that the upgrade code depends on after it executes. 6491 * Therefore this must be called after dsl_pool_sync() does the sync 6492 * tasks. 6493 */ 6494static void 6495spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 6496{ 6497 dsl_pool_t *dp = spa->spa_dsl_pool; 6498 6499 ASSERT(spa->spa_sync_pass == 1); 6500 6501 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 6502 6503 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 6504 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 6505 dsl_pool_create_origin(dp, tx); 6506 6507 /* Keeping the origin open increases spa_minref */ 6508 spa->spa_minref += 3; 6509 } 6510 6511 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 6512 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 6513 dsl_pool_upgrade_clones(dp, tx); 6514 } 6515 6516 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 6517 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 6518 dsl_pool_upgrade_dir_clones(dp, tx); 6519 6520 /* Keeping the freedir open increases spa_minref */ 6521 spa->spa_minref += 3; 6522 } 6523 6524 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 6525 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6526 spa_feature_create_zap_objects(spa, tx); 6527 } 6528 6529 /* 6530 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 6531 * when possibility to use lz4 compression for metadata was added 6532 * Old pools that have this feature enabled must be upgraded to have 6533 * this feature active 6534 */ 6535 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6536 boolean_t lz4_en = spa_feature_is_enabled(spa, 6537 SPA_FEATURE_LZ4_COMPRESS); 6538 boolean_t lz4_ac = spa_feature_is_active(spa, 6539 SPA_FEATURE_LZ4_COMPRESS); 6540 6541 if (lz4_en && !lz4_ac) 6542 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 6543 } 6544 rrw_exit(&dp->dp_config_rwlock, FTAG); 6545} 6546 6547/* 6548 * Sync the specified transaction group. New blocks may be dirtied as 6549 * part of the process, so we iterate until it converges. 6550 */ 6551void 6552spa_sync(spa_t *spa, uint64_t txg) 6553{ 6554 dsl_pool_t *dp = spa->spa_dsl_pool; 6555 objset_t *mos = spa->spa_meta_objset; 6556 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 6557 vdev_t *rvd = spa->spa_root_vdev; 6558 vdev_t *vd; 6559 dmu_tx_t *tx; 6560 int error; 6561 6562 VERIFY(spa_writeable(spa)); 6563 6564 /* 6565 * Lock out configuration changes. 6566 */ 6567 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6568 6569 spa->spa_syncing_txg = txg; 6570 spa->spa_sync_pass = 0; 6571 6572 /* 6573 * If there are any pending vdev state changes, convert them 6574 * into config changes that go out with this transaction group. 6575 */ 6576 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6577 while (list_head(&spa->spa_state_dirty_list) != NULL) { 6578 /* 6579 * We need the write lock here because, for aux vdevs, 6580 * calling vdev_config_dirty() modifies sav_config. 6581 * This is ugly and will become unnecessary when we 6582 * eliminate the aux vdev wart by integrating all vdevs 6583 * into the root vdev tree. 6584 */ 6585 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6586 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 6587 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 6588 vdev_state_clean(vd); 6589 vdev_config_dirty(vd); 6590 } 6591 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6592 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 6593 } 6594 spa_config_exit(spa, SCL_STATE, FTAG); 6595 6596 tx = dmu_tx_create_assigned(dp, txg); 6597 6598 spa->spa_sync_starttime = gethrtime(); 6599#ifdef illumos 6600 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 6601 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 6602#else /* FreeBSD */ 6603#ifdef _KERNEL 6604 callout_reset(&spa->spa_deadman_cycid, 6605 hz * spa->spa_deadman_synctime / NANOSEC, spa_deadman, spa); 6606#endif 6607#endif 6608 6609 /* 6610 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 6611 * set spa_deflate if we have no raid-z vdevs. 6612 */ 6613 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 6614 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 6615 int i; 6616 6617 for (i = 0; i < rvd->vdev_children; i++) { 6618 vd = rvd->vdev_child[i]; 6619 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 6620 break; 6621 } 6622 if (i == rvd->vdev_children) { 6623 spa->spa_deflate = TRUE; 6624 VERIFY(0 == zap_add(spa->spa_meta_objset, 6625 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 6626 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 6627 } 6628 } 6629 6630 /* 6631 * Iterate to convergence. 6632 */ 6633 do { 6634 int pass = ++spa->spa_sync_pass; 6635 6636 spa_sync_config_object(spa, tx); 6637 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 6638 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 6639 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 6640 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 6641 spa_errlog_sync(spa, txg); 6642 dsl_pool_sync(dp, txg); 6643 6644 if (pass < zfs_sync_pass_deferred_free) { 6645 spa_sync_frees(spa, free_bpl, tx); 6646 } else { 6647 /* 6648 * We can not defer frees in pass 1, because 6649 * we sync the deferred frees later in pass 1. 6650 */ 6651 ASSERT3U(pass, >, 1); 6652 bplist_iterate(free_bpl, bpobj_enqueue_cb, 6653 &spa->spa_deferred_bpobj, tx); 6654 } 6655 6656 ddt_sync(spa, txg); 6657 dsl_scan_sync(dp, tx); 6658 6659 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 6660 vdev_sync(vd, txg); 6661 6662 if (pass == 1) { 6663 spa_sync_upgrades(spa, tx); 6664 ASSERT3U(txg, >=, 6665 spa->spa_uberblock.ub_rootbp.blk_birth); 6666 /* 6667 * Note: We need to check if the MOS is dirty 6668 * because we could have marked the MOS dirty 6669 * without updating the uberblock (e.g. if we 6670 * have sync tasks but no dirty user data). We 6671 * need to check the uberblock's rootbp because 6672 * it is updated if we have synced out dirty 6673 * data (though in this case the MOS will most 6674 * likely also be dirty due to second order 6675 * effects, we don't want to rely on that here). 6676 */ 6677 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 6678 !dmu_objset_is_dirty(mos, txg)) { 6679 /* 6680 * Nothing changed on the first pass, 6681 * therefore this TXG is a no-op. Avoid 6682 * syncing deferred frees, so that we 6683 * can keep this TXG as a no-op. 6684 */ 6685 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 6686 txg)); 6687 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6688 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 6689 break; 6690 } 6691 spa_sync_deferred_frees(spa, tx); 6692 } 6693 6694 } while (dmu_objset_is_dirty(mos, txg)); 6695 6696 /* 6697 * Rewrite the vdev configuration (which includes the uberblock) 6698 * to commit the transaction group. 6699 * 6700 * If there are no dirty vdevs, we sync the uberblock to a few 6701 * random top-level vdevs that are known to be visible in the 6702 * config cache (see spa_vdev_add() for a complete description). 6703 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 6704 */ 6705 for (;;) { 6706 /* 6707 * We hold SCL_STATE to prevent vdev open/close/etc. 6708 * while we're attempting to write the vdev labels. 6709 */ 6710 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6711 6712 if (list_is_empty(&spa->spa_config_dirty_list)) { 6713 vdev_t *svd[SPA_DVAS_PER_BP]; 6714 int svdcount = 0; 6715 int children = rvd->vdev_children; 6716 int c0 = spa_get_random(children); 6717 6718 for (int c = 0; c < children; c++) { 6719 vd = rvd->vdev_child[(c0 + c) % children]; 6720 if (vd->vdev_ms_array == 0 || vd->vdev_islog) 6721 continue; 6722 svd[svdcount++] = vd; 6723 if (svdcount == SPA_DVAS_PER_BP) 6724 break; 6725 } 6726 error = vdev_config_sync(svd, svdcount, txg, B_FALSE); 6727 if (error != 0) 6728 error = vdev_config_sync(svd, svdcount, txg, 6729 B_TRUE); 6730 } else { 6731 error = vdev_config_sync(rvd->vdev_child, 6732 rvd->vdev_children, txg, B_FALSE); 6733 if (error != 0) 6734 error = vdev_config_sync(rvd->vdev_child, 6735 rvd->vdev_children, txg, B_TRUE); 6736 } 6737 6738 if (error == 0) 6739 spa->spa_last_synced_guid = rvd->vdev_guid; 6740 6741 spa_config_exit(spa, SCL_STATE, FTAG); 6742 6743 if (error == 0) 6744 break; 6745 zio_suspend(spa, NULL); 6746 zio_resume_wait(spa); 6747 } 6748 dmu_tx_commit(tx); 6749 6750#ifdef illumos 6751 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 6752#else /* FreeBSD */ 6753#ifdef _KERNEL 6754 callout_drain(&spa->spa_deadman_cycid); 6755#endif 6756#endif 6757 6758 /* 6759 * Clear the dirty config list. 6760 */ 6761 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 6762 vdev_config_clean(vd); 6763 6764 /* 6765 * Now that the new config has synced transactionally, 6766 * let it become visible to the config cache. 6767 */ 6768 if (spa->spa_config_syncing != NULL) { 6769 spa_config_set(spa, spa->spa_config_syncing); 6770 spa->spa_config_txg = txg; 6771 spa->spa_config_syncing = NULL; 6772 } 6773 6774 spa->spa_ubsync = spa->spa_uberblock; 6775 6776 dsl_pool_sync_done(dp, txg); 6777 6778 /* 6779 * Update usable space statistics. 6780 */ 6781 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 6782 vdev_sync_done(vd, txg); 6783 6784 spa_update_dspace(spa); 6785 6786 /* 6787 * It had better be the case that we didn't dirty anything 6788 * since vdev_config_sync(). 6789 */ 6790 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 6791 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6792 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 6793 6794 spa->spa_sync_pass = 0; 6795 6796 spa_config_exit(spa, SCL_CONFIG, FTAG); 6797 6798 spa_handle_ignored_writes(spa); 6799 6800 /* 6801 * If any async tasks have been requested, kick them off. 6802 */ 6803 spa_async_dispatch(spa); 6804 spa_async_dispatch_vd(spa); 6805} 6806 6807/* 6808 * Sync all pools. We don't want to hold the namespace lock across these 6809 * operations, so we take a reference on the spa_t and drop the lock during the 6810 * sync. 6811 */ 6812void 6813spa_sync_allpools(void) 6814{ 6815 spa_t *spa = NULL; 6816 mutex_enter(&spa_namespace_lock); 6817 while ((spa = spa_next(spa)) != NULL) { 6818 if (spa_state(spa) != POOL_STATE_ACTIVE || 6819 !spa_writeable(spa) || spa_suspended(spa)) 6820 continue; 6821 spa_open_ref(spa, FTAG); 6822 mutex_exit(&spa_namespace_lock); 6823 txg_wait_synced(spa_get_dsl(spa), 0); 6824 mutex_enter(&spa_namespace_lock); 6825 spa_close(spa, FTAG); 6826 } 6827 mutex_exit(&spa_namespace_lock); 6828} 6829 6830/* 6831 * ========================================================================== 6832 * Miscellaneous routines 6833 * ========================================================================== 6834 */ 6835 6836/* 6837 * Remove all pools in the system. 6838 */ 6839void 6840spa_evict_all(void) 6841{ 6842 spa_t *spa; 6843 6844 /* 6845 * Remove all cached state. All pools should be closed now, 6846 * so every spa in the AVL tree should be unreferenced. 6847 */ 6848 mutex_enter(&spa_namespace_lock); 6849 while ((spa = spa_next(NULL)) != NULL) { 6850 /* 6851 * Stop async tasks. The async thread may need to detach 6852 * a device that's been replaced, which requires grabbing 6853 * spa_namespace_lock, so we must drop it here. 6854 */ 6855 spa_open_ref(spa, FTAG); 6856 mutex_exit(&spa_namespace_lock); 6857 spa_async_suspend(spa); 6858 mutex_enter(&spa_namespace_lock); 6859 spa_close(spa, FTAG); 6860 6861 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 6862 spa_unload(spa); 6863 spa_deactivate(spa); 6864 } 6865 spa_remove(spa); 6866 } 6867 mutex_exit(&spa_namespace_lock); 6868} 6869 6870vdev_t * 6871spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 6872{ 6873 vdev_t *vd; 6874 int i; 6875 6876 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 6877 return (vd); 6878 6879 if (aux) { 6880 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 6881 vd = spa->spa_l2cache.sav_vdevs[i]; 6882 if (vd->vdev_guid == guid) 6883 return (vd); 6884 } 6885 6886 for (i = 0; i < spa->spa_spares.sav_count; i++) { 6887 vd = spa->spa_spares.sav_vdevs[i]; 6888 if (vd->vdev_guid == guid) 6889 return (vd); 6890 } 6891 } 6892 6893 return (NULL); 6894} 6895 6896void 6897spa_upgrade(spa_t *spa, uint64_t version) 6898{ 6899 ASSERT(spa_writeable(spa)); 6900 6901 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6902 6903 /* 6904 * This should only be called for a non-faulted pool, and since a 6905 * future version would result in an unopenable pool, this shouldn't be 6906 * possible. 6907 */ 6908 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 6909 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 6910 6911 spa->spa_uberblock.ub_version = version; 6912 vdev_config_dirty(spa->spa_root_vdev); 6913 6914 spa_config_exit(spa, SCL_ALL, FTAG); 6915 6916 txg_wait_synced(spa_get_dsl(spa), 0); 6917} 6918 6919boolean_t 6920spa_has_spare(spa_t *spa, uint64_t guid) 6921{ 6922 int i; 6923 uint64_t spareguid; 6924 spa_aux_vdev_t *sav = &spa->spa_spares; 6925 6926 for (i = 0; i < sav->sav_count; i++) 6927 if (sav->sav_vdevs[i]->vdev_guid == guid) 6928 return (B_TRUE); 6929 6930 for (i = 0; i < sav->sav_npending; i++) { 6931 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 6932 &spareguid) == 0 && spareguid == guid) 6933 return (B_TRUE); 6934 } 6935 6936 return (B_FALSE); 6937} 6938 6939/* 6940 * Check if a pool has an active shared spare device. 6941 * Note: reference count of an active spare is 2, as a spare and as a replace 6942 */ 6943static boolean_t 6944spa_has_active_shared_spare(spa_t *spa) 6945{ 6946 int i, refcnt; 6947 uint64_t pool; 6948 spa_aux_vdev_t *sav = &spa->spa_spares; 6949 6950 for (i = 0; i < sav->sav_count; i++) { 6951 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 6952 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 6953 refcnt > 2) 6954 return (B_TRUE); 6955 } 6956 6957 return (B_FALSE); 6958} 6959 6960/* 6961 * Post a sysevent corresponding to the given event. The 'name' must be one of 6962 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 6963 * filled in from the spa and (optionally) the vdev. This doesn't do anything 6964 * in the userland libzpool, as we don't want consumers to misinterpret ztest 6965 * or zdb as real changes. 6966 */ 6967void 6968spa_event_notify(spa_t *spa, vdev_t *vd, const char *name) 6969{ 6970#ifdef _KERNEL 6971 sysevent_t *ev; 6972 sysevent_attr_list_t *attr = NULL; 6973 sysevent_value_t value; 6974 sysevent_id_t eid; 6975 6976 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 6977 SE_SLEEP); 6978 6979 value.value_type = SE_DATA_TYPE_STRING; 6980 value.value.sv_string = spa_name(spa); 6981 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0) 6982 goto done; 6983 6984 value.value_type = SE_DATA_TYPE_UINT64; 6985 value.value.sv_uint64 = spa_guid(spa); 6986 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0) 6987 goto done; 6988 6989 if (vd) { 6990 value.value_type = SE_DATA_TYPE_UINT64; 6991 value.value.sv_uint64 = vd->vdev_guid; 6992 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value, 6993 SE_SLEEP) != 0) 6994 goto done; 6995 6996 if (vd->vdev_path) { 6997 value.value_type = SE_DATA_TYPE_STRING; 6998 value.value.sv_string = vd->vdev_path; 6999 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH, 7000 &value, SE_SLEEP) != 0) 7001 goto done; 7002 } 7003 } 7004 7005 if (sysevent_attach_attributes(ev, attr) != 0) 7006 goto done; 7007 attr = NULL; 7008 7009 (void) log_sysevent(ev, SE_SLEEP, &eid); 7010 7011done: 7012 if (attr) 7013 sysevent_free_attr(attr); 7014 sysevent_free(ev); 7015#endif 7016} 7017