1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 25 * Copyright (c) 2015, Nexenta Systems, Inc. All rights reserved. 26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 27 * Copyright 2013 Saso Kiselkov. All rights reserved. 28 * Copyright (c) 2014 Integros [integros.com] 29 */ 30 31 /* 32 * SPA: Storage Pool Allocator 33 * 34 * This file contains all the routines used when modifying on-disk SPA state. 35 * This includes opening, importing, destroying, exporting a pool, and syncing a 36 * pool. 37 */ 38 39 #include <sys/zfs_context.h> 40 #include <sys/fm/fs/zfs.h> 41 #include <sys/spa_impl.h> 42 #include <sys/zio.h> 43 #include <sys/zio_checksum.h> 44 #include <sys/dmu.h> 45 #include <sys/dmu_tx.h> 46 #include <sys/zap.h> 47 #include <sys/zil.h> 48 #include <sys/ddt.h> 49 #include <sys/vdev_impl.h> 50 #include <sys/metaslab.h> 51 #include <sys/metaslab_impl.h> 52 #include <sys/uberblock_impl.h> 53 #include <sys/txg.h> 54 #include <sys/avl.h> 55 #include <sys/dmu_traverse.h> 56 #include <sys/dmu_objset.h> 57 #include <sys/unique.h> 58 #include <sys/dsl_pool.h> 59 #include <sys/dsl_dataset.h> 60 #include <sys/dsl_dir.h> 61 #include <sys/dsl_prop.h> 62 #include <sys/dsl_synctask.h> 63 #include <sys/fs/zfs.h> 64 #include <sys/arc.h> 65 #include <sys/callb.h> 66 #include <sys/systeminfo.h> 67 #include <sys/spa_boot.h> 68 #include <sys/zfs_ioctl.h> 69 #include <sys/dsl_scan.h> 70 #include <sys/zfeature.h> 71 #include <sys/dsl_destroy.h> 72 73 #ifdef _KERNEL 74 #include <sys/bootprops.h> 75 #include <sys/callb.h> 76 #include <sys/cpupart.h> 77 #include <sys/pool.h> 78 #include <sys/sysdc.h> 79 #include <sys/zone.h> 80 #endif /* _KERNEL */ 81 82 #include "zfs_prop.h" 83 #include "zfs_comutil.h" 84 85 /* 86 * The interval, in seconds, at which failed configuration cache file writes 87 * should be retried. 88 */ 89 static int zfs_ccw_retry_interval = 300; 90 91 typedef enum zti_modes { 92 ZTI_MODE_FIXED, /* value is # of threads (min 1) */ 93 ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ 94 ZTI_MODE_NULL, /* don't create a taskq */ 95 ZTI_NMODES 96 } zti_modes_t; 97 98 #define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } 99 #define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } 100 #define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } 101 102 #define ZTI_N(n) ZTI_P(n, 1) 103 #define ZTI_ONE ZTI_N(1) 104 105 typedef struct zio_taskq_info { 106 zti_modes_t zti_mode; 107 uint_t zti_value; 108 uint_t zti_count; 109 } zio_taskq_info_t; 110 111 static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { 112 "issue", "issue_high", "intr", "intr_high" 113 }; 114 115 /* 116 * This table defines the taskq settings for each ZFS I/O type. When 117 * initializing a pool, we use this table to create an appropriately sized 118 * taskq. Some operations are low volume and therefore have a small, static 119 * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE 120 * macros. Other operations process a large amount of data; the ZTI_BATCH 121 * macro causes us to create a taskq oriented for throughput. Some operations 122 * are so high frequency and short-lived that the taskq itself can become a a 123 * point of lock contention. The ZTI_P(#, #) macro indicates that we need an 124 * additional degree of parallelism specified by the number of threads per- 125 * taskq and the number of taskqs; when dispatching an event in this case, the 126 * particular taskq is chosen at random. 127 * 128 * The different taskq priorities are to handle the different contexts (issue 129 * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that 130 * need to be handled with minimum delay. 131 */ 132 const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { 133 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ 134 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ 135 { ZTI_N(8), ZTI_NULL, ZTI_P(12, 8), ZTI_NULL }, /* READ */ 136 { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ 137 { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ 138 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ 139 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ 140 }; 141 142 static void spa_sync_version(void *arg, dmu_tx_t *tx); 143 static void spa_sync_props(void *arg, dmu_tx_t *tx); 144 static boolean_t spa_has_active_shared_spare(spa_t *spa); 145 static int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config, 146 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 147 char **ereport); 148 static void spa_vdev_resilver_done(spa_t *spa); 149 150 uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 151 id_t zio_taskq_psrset_bind = PS_NONE; 152 boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 153 uint_t zio_taskq_basedc = 80; /* base duty cycle */ 154 155 boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 156 extern int zfs_sync_pass_deferred_free; 157 158 /* 159 * This (illegal) pool name is used when temporarily importing a spa_t in order 160 * to get the vdev stats associated with the imported devices. 161 */ 162 #define TRYIMPORT_NAME "$import" 163 164 /* 165 * ========================================================================== 166 * SPA properties routines 167 * ========================================================================== 168 */ 169 170 /* 171 * Add a (source=src, propname=propval) list to an nvlist. 172 */ 173 static void 174 spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 175 uint64_t intval, zprop_source_t src) 176 { 177 const char *propname = zpool_prop_to_name(prop); 178 nvlist_t *propval; 179 180 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 181 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 182 183 if (strval != NULL) 184 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 185 else 186 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 187 188 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 189 nvlist_free(propval); 190 } 191 192 /* 193 * Get property values from the spa configuration. 194 */ 195 static void 196 spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 197 { 198 vdev_t *rvd = spa->spa_root_vdev; 199 dsl_pool_t *pool = spa->spa_dsl_pool; 200 uint64_t size, alloc, cap, version; 201 zprop_source_t src = ZPROP_SRC_NONE; 202 spa_config_dirent_t *dp; 203 metaslab_class_t *mc = spa_normal_class(spa); 204 205 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 206 207 if (rvd != NULL) { 208 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 209 size = metaslab_class_get_space(spa_normal_class(spa)); 210 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 211 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 212 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 213 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 214 size - alloc, src); 215 216 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 217 metaslab_class_fragmentation(mc), src); 218 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 219 metaslab_class_expandable_space(mc), src); 220 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 221 (spa_mode(spa) == FREAD), src); 222 223 cap = (size == 0) ? 0 : (alloc * 100 / size); 224 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 225 226 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 227 ddt_get_pool_dedup_ratio(spa), src); 228 229 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 230 rvd->vdev_state, src); 231 232 version = spa_version(spa); 233 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 234 src = ZPROP_SRC_DEFAULT; 235 else 236 src = ZPROP_SRC_LOCAL; 237 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 238 } 239 240 if (pool != NULL) { 241 /* 242 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 243 * when opening pools before this version freedir will be NULL. 244 */ 245 if (pool->dp_free_dir != NULL) { 246 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 247 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 248 src); 249 } else { 250 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 251 NULL, 0, src); 252 } 253 254 if (pool->dp_leak_dir != NULL) { 255 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 256 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 257 src); 258 } else { 259 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 260 NULL, 0, src); 261 } 262 } 263 264 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 265 266 if (spa->spa_comment != NULL) { 267 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 268 0, ZPROP_SRC_LOCAL); 269 } 270 271 if (spa->spa_root != NULL) 272 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 273 0, ZPROP_SRC_LOCAL); 274 275 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 276 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 277 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 278 } else { 279 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 280 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 281 } 282 283 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 284 if (dp->scd_path == NULL) { 285 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 286 "none", 0, ZPROP_SRC_LOCAL); 287 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 288 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 289 dp->scd_path, 0, ZPROP_SRC_LOCAL); 290 } 291 } 292 } 293 294 /* 295 * Get zpool property values. 296 */ 297 int 298 spa_prop_get(spa_t *spa, nvlist_t **nvp) 299 { 300 objset_t *mos = spa->spa_meta_objset; 301 zap_cursor_t zc; 302 zap_attribute_t za; 303 int err; 304 305 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 306 307 mutex_enter(&spa->spa_props_lock); 308 309 /* 310 * Get properties from the spa config. 311 */ 312 spa_prop_get_config(spa, nvp); 313 314 /* If no pool property object, no more prop to get. */ 315 if (mos == NULL || spa->spa_pool_props_object == 0) { 316 mutex_exit(&spa->spa_props_lock); 317 return (0); 318 } 319 320 /* 321 * Get properties from the MOS pool property object. 322 */ 323 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 324 (err = zap_cursor_retrieve(&zc, &za)) == 0; 325 zap_cursor_advance(&zc)) { 326 uint64_t intval = 0; 327 char *strval = NULL; 328 zprop_source_t src = ZPROP_SRC_DEFAULT; 329 zpool_prop_t prop; 330 331 if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL) 332 continue; 333 334 switch (za.za_integer_length) { 335 case 8: 336 /* integer property */ 337 if (za.za_first_integer != 338 zpool_prop_default_numeric(prop)) 339 src = ZPROP_SRC_LOCAL; 340 341 if (prop == ZPOOL_PROP_BOOTFS) { 342 dsl_pool_t *dp; 343 dsl_dataset_t *ds = NULL; 344 345 dp = spa_get_dsl(spa); 346 dsl_pool_config_enter(dp, FTAG); 347 if (err = dsl_dataset_hold_obj(dp, 348 za.za_first_integer, FTAG, &ds)) { 349 dsl_pool_config_exit(dp, FTAG); 350 break; 351 } 352 353 strval = kmem_alloc( 354 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1, 355 KM_SLEEP); 356 dsl_dataset_name(ds, strval); 357 dsl_dataset_rele(ds, FTAG); 358 dsl_pool_config_exit(dp, FTAG); 359 } else { 360 strval = NULL; 361 intval = za.za_first_integer; 362 } 363 364 spa_prop_add_list(*nvp, prop, strval, intval, src); 365 366 if (strval != NULL) 367 kmem_free(strval, 368 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1); 369 370 break; 371 372 case 1: 373 /* string property */ 374 strval = kmem_alloc(za.za_num_integers, KM_SLEEP); 375 err = zap_lookup(mos, spa->spa_pool_props_object, 376 za.za_name, 1, za.za_num_integers, strval); 377 if (err) { 378 kmem_free(strval, za.za_num_integers); 379 break; 380 } 381 spa_prop_add_list(*nvp, prop, strval, 0, src); 382 kmem_free(strval, za.za_num_integers); 383 break; 384 385 default: 386 break; 387 } 388 } 389 zap_cursor_fini(&zc); 390 mutex_exit(&spa->spa_props_lock); 391 out: 392 if (err && err != ENOENT) { 393 nvlist_free(*nvp); 394 *nvp = NULL; 395 return (err); 396 } 397 398 return (0); 399 } 400 401 /* 402 * Validate the given pool properties nvlist and modify the list 403 * for the property values to be set. 404 */ 405 static int 406 spa_prop_validate(spa_t *spa, nvlist_t *props) 407 { 408 nvpair_t *elem; 409 int error = 0, reset_bootfs = 0; 410 uint64_t objnum = 0; 411 boolean_t has_feature = B_FALSE; 412 413 elem = NULL; 414 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { 415 uint64_t intval; 416 char *strval, *slash, *check, *fname; 417 const char *propname = nvpair_name(elem); 418 zpool_prop_t prop = zpool_name_to_prop(propname); 419 420 switch (prop) { 421 case ZPROP_INVAL: 422 if (!zpool_prop_feature(propname)) { 423 error = SET_ERROR(EINVAL); 424 break; 425 } 426 427 /* 428 * Sanitize the input. 429 */ 430 if (nvpair_type(elem) != DATA_TYPE_UINT64) { 431 error = SET_ERROR(EINVAL); 432 break; 433 } 434 435 if (nvpair_value_uint64(elem, &intval) != 0) { 436 error = SET_ERROR(EINVAL); 437 break; 438 } 439 440 if (intval != 0) { 441 error = SET_ERROR(EINVAL); 442 break; 443 } 444 445 fname = strchr(propname, '@') + 1; 446 if (zfeature_lookup_name(fname, NULL) != 0) { 447 error = SET_ERROR(EINVAL); 448 break; 449 } 450 451 has_feature = B_TRUE; 452 break; 453 454 case ZPOOL_PROP_VERSION: 455 error = nvpair_value_uint64(elem, &intval); 456 if (!error && 457 (intval < spa_version(spa) || 458 intval > SPA_VERSION_BEFORE_FEATURES || 459 has_feature)) 460 error = SET_ERROR(EINVAL); 461 break; 462 463 case ZPOOL_PROP_DELEGATION: 464 case ZPOOL_PROP_AUTOREPLACE: 465 case ZPOOL_PROP_LISTSNAPS: 466 case ZPOOL_PROP_AUTOEXPAND: 467 error = nvpair_value_uint64(elem, &intval); 468 if (!error && intval > 1) 469 error = SET_ERROR(EINVAL); 470 break; 471 472 case ZPOOL_PROP_BOOTFS: 473 /* 474 * If the pool version is less than SPA_VERSION_BOOTFS, 475 * or the pool is still being created (version == 0), 476 * the bootfs property cannot be set. 477 */ 478 if (spa_version(spa) < SPA_VERSION_BOOTFS) { 479 error = SET_ERROR(ENOTSUP); 480 break; 481 } 482 483 /* 484 * Make sure the vdev config is bootable 485 */ 486 if (!vdev_is_bootable(spa->spa_root_vdev)) { 487 error = SET_ERROR(ENOTSUP); 488 break; 489 } 490 491 reset_bootfs = 1; 492 493 error = nvpair_value_string(elem, &strval); 494 495 if (!error) { 496 objset_t *os; 497 uint64_t propval; 498 499 if (strval == NULL || strval[0] == '\0') { 500 objnum = zpool_prop_default_numeric( 501 ZPOOL_PROP_BOOTFS); 502 break; 503 } 504 505 if (error = dmu_objset_hold(strval, FTAG, &os)) 506 break; 507 508 /* 509 * Must be ZPL, and its property settings 510 * must be supported by GRUB (compression 511 * is not gzip, and large blocks are not used). 512 */ 513 514 if (dmu_objset_type(os) != DMU_OST_ZFS) { 515 error = SET_ERROR(ENOTSUP); 516 } else if ((error = 517 dsl_prop_get_int_ds(dmu_objset_ds(os), 518 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 519 &propval)) == 0 && 520 !BOOTFS_COMPRESS_VALID(propval)) { 521 error = SET_ERROR(ENOTSUP); 522 } else if ((error = 523 dsl_prop_get_int_ds(dmu_objset_ds(os), 524 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 525 &propval)) == 0 && 526 propval > SPA_OLD_MAXBLOCKSIZE) { 527 error = SET_ERROR(ENOTSUP); 528 } else { 529 objnum = dmu_objset_id(os); 530 } 531 dmu_objset_rele(os, FTAG); 532 } 533 break; 534 535 case ZPOOL_PROP_FAILUREMODE: 536 error = nvpair_value_uint64(elem, &intval); 537 if (!error && (intval < ZIO_FAILURE_MODE_WAIT || 538 intval > ZIO_FAILURE_MODE_PANIC)) 539 error = SET_ERROR(EINVAL); 540 541 /* 542 * This is a special case which only occurs when 543 * the pool has completely failed. This allows 544 * the user to change the in-core failmode property 545 * without syncing it out to disk (I/Os might 546 * currently be blocked). We do this by returning 547 * EIO to the caller (spa_prop_set) to trick it 548 * into thinking we encountered a property validation 549 * error. 550 */ 551 if (!error && spa_suspended(spa)) { 552 spa->spa_failmode = intval; 553 error = SET_ERROR(EIO); 554 } 555 break; 556 557 case ZPOOL_PROP_CACHEFILE: 558 if ((error = nvpair_value_string(elem, &strval)) != 0) 559 break; 560 561 if (strval[0] == '\0') 562 break; 563 564 if (strcmp(strval, "none") == 0) 565 break; 566 567 if (strval[0] != '/') { 568 error = SET_ERROR(EINVAL); 569 break; 570 } 571 572 slash = strrchr(strval, '/'); 573 ASSERT(slash != NULL); 574 575 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || 576 strcmp(slash, "/..") == 0) 577 error = SET_ERROR(EINVAL); 578 break; 579 580 case ZPOOL_PROP_COMMENT: 581 if ((error = nvpair_value_string(elem, &strval)) != 0) 582 break; 583 for (check = strval; *check != '\0'; check++) { 584 /* 585 * The kernel doesn't have an easy isprint() 586 * check. For this kernel check, we merely 587 * check ASCII apart from DEL. Fix this if 588 * there is an easy-to-use kernel isprint(). 589 */ 590 if (*check >= 0x7f) { 591 error = SET_ERROR(EINVAL); 592 break; 593 } 594 } 595 if (strlen(strval) > ZPROP_MAX_COMMENT) 596 error = E2BIG; 597 break; 598 599 case ZPOOL_PROP_DEDUPDITTO: 600 if (spa_version(spa) < SPA_VERSION_DEDUP) 601 error = SET_ERROR(ENOTSUP); 602 else 603 error = nvpair_value_uint64(elem, &intval); 604 if (error == 0 && 605 intval != 0 && intval < ZIO_DEDUPDITTO_MIN) 606 error = SET_ERROR(EINVAL); 607 break; 608 } 609 610 if (error) 611 break; 612 } 613 614 if (!error && reset_bootfs) { 615 error = nvlist_remove(props, 616 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); 617 618 if (!error) { 619 error = nvlist_add_uint64(props, 620 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); 621 } 622 } 623 624 return (error); 625 } 626 627 void 628 spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) 629 { 630 char *cachefile; 631 spa_config_dirent_t *dp; 632 633 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), 634 &cachefile) != 0) 635 return; 636 637 dp = kmem_alloc(sizeof (spa_config_dirent_t), 638 KM_SLEEP); 639 640 if (cachefile[0] == '\0') 641 dp->scd_path = spa_strdup(spa_config_path); 642 else if (strcmp(cachefile, "none") == 0) 643 dp->scd_path = NULL; 644 else 645 dp->scd_path = spa_strdup(cachefile); 646 647 list_insert_head(&spa->spa_config_list, dp); 648 if (need_sync) 649 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 650 } 651 652 int 653 spa_prop_set(spa_t *spa, nvlist_t *nvp) 654 { 655 int error; 656 nvpair_t *elem = NULL; 657 boolean_t need_sync = B_FALSE; 658 659 if ((error = spa_prop_validate(spa, nvp)) != 0) 660 return (error); 661 662 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { 663 zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); 664 665 if (prop == ZPOOL_PROP_CACHEFILE || 666 prop == ZPOOL_PROP_ALTROOT || 667 prop == ZPOOL_PROP_READONLY) 668 continue; 669 670 if (prop == ZPOOL_PROP_VERSION || prop == ZPROP_INVAL) { 671 uint64_t ver; 672 673 if (prop == ZPOOL_PROP_VERSION) { 674 VERIFY(nvpair_value_uint64(elem, &ver) == 0); 675 } else { 676 ASSERT(zpool_prop_feature(nvpair_name(elem))); 677 ver = SPA_VERSION_FEATURES; 678 need_sync = B_TRUE; 679 } 680 681 /* Save time if the version is already set. */ 682 if (ver == spa_version(spa)) 683 continue; 684 685 /* 686 * In addition to the pool directory object, we might 687 * create the pool properties object, the features for 688 * read object, the features for write object, or the 689 * feature descriptions object. 690 */ 691 error = dsl_sync_task(spa->spa_name, NULL, 692 spa_sync_version, &ver, 693 6, ZFS_SPACE_CHECK_RESERVED); 694 if (error) 695 return (error); 696 continue; 697 } 698 699 need_sync = B_TRUE; 700 break; 701 } 702 703 if (need_sync) { 704 return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, 705 nvp, 6, ZFS_SPACE_CHECK_RESERVED)); 706 } 707 708 return (0); 709 } 710 711 /* 712 * If the bootfs property value is dsobj, clear it. 713 */ 714 void 715 spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) 716 { 717 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { 718 VERIFY(zap_remove(spa->spa_meta_objset, 719 spa->spa_pool_props_object, 720 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); 721 spa->spa_bootfs = 0; 722 } 723 } 724 725 /*ARGSUSED*/ 726 static int 727 spa_change_guid_check(void *arg, dmu_tx_t *tx) 728 { 729 uint64_t *newguid = arg; 730 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 731 vdev_t *rvd = spa->spa_root_vdev; 732 uint64_t vdev_state; 733 734 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 735 vdev_state = rvd->vdev_state; 736 spa_config_exit(spa, SCL_STATE, FTAG); 737 738 if (vdev_state != VDEV_STATE_HEALTHY) 739 return (SET_ERROR(ENXIO)); 740 741 ASSERT3U(spa_guid(spa), !=, *newguid); 742 743 return (0); 744 } 745 746 static void 747 spa_change_guid_sync(void *arg, dmu_tx_t *tx) 748 { 749 uint64_t *newguid = arg; 750 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 751 uint64_t oldguid; 752 vdev_t *rvd = spa->spa_root_vdev; 753 754 oldguid = spa_guid(spa); 755 756 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 757 rvd->vdev_guid = *newguid; 758 rvd->vdev_guid_sum += (*newguid - oldguid); 759 vdev_config_dirty(rvd); 760 spa_config_exit(spa, SCL_STATE, FTAG); 761 762 spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", 763 oldguid, *newguid); 764 } 765 766 /* 767 * Change the GUID for the pool. This is done so that we can later 768 * re-import a pool built from a clone of our own vdevs. We will modify 769 * the root vdev's guid, our own pool guid, and then mark all of our 770 * vdevs dirty. Note that we must make sure that all our vdevs are 771 * online when we do this, or else any vdevs that weren't present 772 * would be orphaned from our pool. We are also going to issue a 773 * sysevent to update any watchers. 774 */ 775 int 776 spa_change_guid(spa_t *spa) 777 { 778 int error; 779 uint64_t guid; 780 781 mutex_enter(&spa->spa_vdev_top_lock); 782 mutex_enter(&spa_namespace_lock); 783 guid = spa_generate_guid(NULL); 784 785 error = dsl_sync_task(spa->spa_name, spa_change_guid_check, 786 spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); 787 788 if (error == 0) { 789 spa_config_sync(spa, B_FALSE, B_TRUE); 790 spa_event_notify(spa, NULL, ESC_ZFS_POOL_REGUID); 791 } 792 793 mutex_exit(&spa_namespace_lock); 794 mutex_exit(&spa->spa_vdev_top_lock); 795 796 return (error); 797 } 798 799 /* 800 * ========================================================================== 801 * SPA state manipulation (open/create/destroy/import/export) 802 * ========================================================================== 803 */ 804 805 static int 806 spa_error_entry_compare(const void *a, const void *b) 807 { 808 spa_error_entry_t *sa = (spa_error_entry_t *)a; 809 spa_error_entry_t *sb = (spa_error_entry_t *)b; 810 int ret; 811 812 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark, 813 sizeof (zbookmark_phys_t)); 814 815 if (ret < 0) 816 return (-1); 817 else if (ret > 0) 818 return (1); 819 else 820 return (0); 821 } 822 823 /* 824 * Utility function which retrieves copies of the current logs and 825 * re-initializes them in the process. 826 */ 827 void 828 spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) 829 { 830 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); 831 832 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); 833 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); 834 835 avl_create(&spa->spa_errlist_scrub, 836 spa_error_entry_compare, sizeof (spa_error_entry_t), 837 offsetof(spa_error_entry_t, se_avl)); 838 avl_create(&spa->spa_errlist_last, 839 spa_error_entry_compare, sizeof (spa_error_entry_t), 840 offsetof(spa_error_entry_t, se_avl)); 841 } 842 843 static void 844 spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 845 { 846 const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; 847 enum zti_modes mode = ztip->zti_mode; 848 uint_t value = ztip->zti_value; 849 uint_t count = ztip->zti_count; 850 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 851 char name[32]; 852 uint_t flags = 0; 853 boolean_t batch = B_FALSE; 854 855 if (mode == ZTI_MODE_NULL) { 856 tqs->stqs_count = 0; 857 tqs->stqs_taskq = NULL; 858 return; 859 } 860 861 ASSERT3U(count, >, 0); 862 863 tqs->stqs_count = count; 864 tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); 865 866 switch (mode) { 867 case ZTI_MODE_FIXED: 868 ASSERT3U(value, >=, 1); 869 value = MAX(value, 1); 870 break; 871 872 case ZTI_MODE_BATCH: 873 batch = B_TRUE; 874 flags |= TASKQ_THREADS_CPU_PCT; 875 value = zio_taskq_batch_pct; 876 break; 877 878 default: 879 panic("unrecognized mode for %s_%s taskq (%u:%u) in " 880 "spa_activate()", 881 zio_type_name[t], zio_taskq_types[q], mode, value); 882 break; 883 } 884 885 for (uint_t i = 0; i < count; i++) { 886 taskq_t *tq; 887 888 if (count > 1) { 889 (void) snprintf(name, sizeof (name), "%s_%s_%u", 890 zio_type_name[t], zio_taskq_types[q], i); 891 } else { 892 (void) snprintf(name, sizeof (name), "%s_%s", 893 zio_type_name[t], zio_taskq_types[q]); 894 } 895 896 if (zio_taskq_sysdc && spa->spa_proc != &p0) { 897 if (batch) 898 flags |= TASKQ_DC_BATCH; 899 900 tq = taskq_create_sysdc(name, value, 50, INT_MAX, 901 spa->spa_proc, zio_taskq_basedc, flags); 902 } else { 903 pri_t pri = maxclsyspri; 904 /* 905 * The write issue taskq can be extremely CPU 906 * intensive. Run it at slightly lower priority 907 * than the other taskqs. 908 */ 909 if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) 910 pri--; 911 912 tq = taskq_create_proc(name, value, pri, 50, 913 INT_MAX, spa->spa_proc, flags); 914 } 915 916 tqs->stqs_taskq[i] = tq; 917 } 918 } 919 920 static void 921 spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 922 { 923 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 924 925 if (tqs->stqs_taskq == NULL) { 926 ASSERT0(tqs->stqs_count); 927 return; 928 } 929 930 for (uint_t i = 0; i < tqs->stqs_count; i++) { 931 ASSERT3P(tqs->stqs_taskq[i], !=, NULL); 932 taskq_destroy(tqs->stqs_taskq[i]); 933 } 934 935 kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); 936 tqs->stqs_taskq = NULL; 937 } 938 939 /* 940 * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. 941 * Note that a type may have multiple discrete taskqs to avoid lock contention 942 * on the taskq itself. In that case we choose which taskq at random by using 943 * the low bits of gethrtime(). 944 */ 945 void 946 spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, 947 task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) 948 { 949 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 950 taskq_t *tq; 951 952 ASSERT3P(tqs->stqs_taskq, !=, NULL); 953 ASSERT3U(tqs->stqs_count, !=, 0); 954 955 if (tqs->stqs_count == 1) { 956 tq = tqs->stqs_taskq[0]; 957 } else { 958 tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; 959 } 960 961 taskq_dispatch_ent(tq, func, arg, flags, ent); 962 } 963 964 static void 965 spa_create_zio_taskqs(spa_t *spa) 966 { 967 for (int t = 0; t < ZIO_TYPES; t++) { 968 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 969 spa_taskqs_init(spa, t, q); 970 } 971 } 972 } 973 974 #ifdef _KERNEL 975 static void 976 spa_thread(void *arg) 977 { 978 callb_cpr_t cprinfo; 979 980 spa_t *spa = arg; 981 user_t *pu = PTOU(curproc); 982 983 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, 984 spa->spa_name); 985 986 ASSERT(curproc != &p0); 987 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), 988 "zpool-%s", spa->spa_name); 989 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); 990 991 /* bind this thread to the requested psrset */ 992 if (zio_taskq_psrset_bind != PS_NONE) { 993 pool_lock(); 994 mutex_enter(&cpu_lock); 995 mutex_enter(&pidlock); 996 mutex_enter(&curproc->p_lock); 997 998 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, 999 0, NULL, NULL) == 0) { 1000 curthread->t_bind_pset = zio_taskq_psrset_bind; 1001 } else { 1002 cmn_err(CE_WARN, 1003 "Couldn't bind process for zfs pool \"%s\" to " 1004 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); 1005 } 1006 1007 mutex_exit(&curproc->p_lock); 1008 mutex_exit(&pidlock); 1009 mutex_exit(&cpu_lock); 1010 pool_unlock(); 1011 } 1012 1013 if (zio_taskq_sysdc) { 1014 sysdc_thread_enter(curthread, 100, 0); 1015 } 1016 1017 spa->spa_proc = curproc; 1018 spa->spa_did = curthread->t_did; 1019 1020 spa_create_zio_taskqs(spa); 1021 1022 mutex_enter(&spa->spa_proc_lock); 1023 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); 1024 1025 spa->spa_proc_state = SPA_PROC_ACTIVE; 1026 cv_broadcast(&spa->spa_proc_cv); 1027 1028 CALLB_CPR_SAFE_BEGIN(&cprinfo); 1029 while (spa->spa_proc_state == SPA_PROC_ACTIVE) 1030 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1031 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); 1032 1033 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); 1034 spa->spa_proc_state = SPA_PROC_GONE; 1035 spa->spa_proc = &p0; 1036 cv_broadcast(&spa->spa_proc_cv); 1037 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ 1038 1039 mutex_enter(&curproc->p_lock); 1040 lwp_exit(); 1041 } 1042 #endif 1043 1044 /* 1045 * Activate an uninitialized pool. 1046 */ 1047 static void 1048 spa_activate(spa_t *spa, int mode) 1049 { 1050 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 1051 1052 spa->spa_state = POOL_STATE_ACTIVE; 1053 spa->spa_mode = mode; 1054 1055 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); 1056 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); 1057 1058 /* Try to create a covering process */ 1059 mutex_enter(&spa->spa_proc_lock); 1060 ASSERT(spa->spa_proc_state == SPA_PROC_NONE); 1061 ASSERT(spa->spa_proc == &p0); 1062 spa->spa_did = 0; 1063 1064 /* Only create a process if we're going to be around a while. */ 1065 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { 1066 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, 1067 NULL, 0) == 0) { 1068 spa->spa_proc_state = SPA_PROC_CREATED; 1069 while (spa->spa_proc_state == SPA_PROC_CREATED) { 1070 cv_wait(&spa->spa_proc_cv, 1071 &spa->spa_proc_lock); 1072 } 1073 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1074 ASSERT(spa->spa_proc != &p0); 1075 ASSERT(spa->spa_did != 0); 1076 } else { 1077 #ifdef _KERNEL 1078 cmn_err(CE_WARN, 1079 "Couldn't create process for zfs pool \"%s\"\n", 1080 spa->spa_name); 1081 #endif 1082 } 1083 } 1084 mutex_exit(&spa->spa_proc_lock); 1085 1086 /* If we didn't create a process, we need to create our taskqs. */ 1087 if (spa->spa_proc == &p0) { 1088 spa_create_zio_taskqs(spa); 1089 } 1090 1091 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), 1092 offsetof(vdev_t, vdev_config_dirty_node)); 1093 list_create(&spa->spa_evicting_os_list, sizeof (objset_t), 1094 offsetof(objset_t, os_evicting_node)); 1095 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), 1096 offsetof(vdev_t, vdev_state_dirty_node)); 1097 1098 txg_list_create(&spa->spa_vdev_txg_list, 1099 offsetof(struct vdev, vdev_txg_node)); 1100 1101 avl_create(&spa->spa_errlist_scrub, 1102 spa_error_entry_compare, sizeof (spa_error_entry_t), 1103 offsetof(spa_error_entry_t, se_avl)); 1104 avl_create(&spa->spa_errlist_last, 1105 spa_error_entry_compare, sizeof (spa_error_entry_t), 1106 offsetof(spa_error_entry_t, se_avl)); 1107 } 1108 1109 /* 1110 * Opposite of spa_activate(). 1111 */ 1112 static void 1113 spa_deactivate(spa_t *spa) 1114 { 1115 ASSERT(spa->spa_sync_on == B_FALSE); 1116 ASSERT(spa->spa_dsl_pool == NULL); 1117 ASSERT(spa->spa_root_vdev == NULL); 1118 ASSERT(spa->spa_async_zio_root == NULL); 1119 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); 1120 1121 spa_evicting_os_wait(spa); 1122 1123 txg_list_destroy(&spa->spa_vdev_txg_list); 1124 1125 list_destroy(&spa->spa_config_dirty_list); 1126 list_destroy(&spa->spa_evicting_os_list); 1127 list_destroy(&spa->spa_state_dirty_list); 1128 1129 for (int t = 0; t < ZIO_TYPES; t++) { 1130 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1131 spa_taskqs_fini(spa, t, q); 1132 } 1133 } 1134 1135 metaslab_class_destroy(spa->spa_normal_class); 1136 spa->spa_normal_class = NULL; 1137 1138 metaslab_class_destroy(spa->spa_log_class); 1139 spa->spa_log_class = NULL; 1140 1141 /* 1142 * If this was part of an import or the open otherwise failed, we may 1143 * still have errors left in the queues. Empty them just in case. 1144 */ 1145 spa_errlog_drain(spa); 1146 1147 avl_destroy(&spa->spa_errlist_scrub); 1148 avl_destroy(&spa->spa_errlist_last); 1149 1150 spa->spa_state = POOL_STATE_UNINITIALIZED; 1151 1152 mutex_enter(&spa->spa_proc_lock); 1153 if (spa->spa_proc_state != SPA_PROC_NONE) { 1154 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1155 spa->spa_proc_state = SPA_PROC_DEACTIVATE; 1156 cv_broadcast(&spa->spa_proc_cv); 1157 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { 1158 ASSERT(spa->spa_proc != &p0); 1159 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1160 } 1161 ASSERT(spa->spa_proc_state == SPA_PROC_GONE); 1162 spa->spa_proc_state = SPA_PROC_NONE; 1163 } 1164 ASSERT(spa->spa_proc == &p0); 1165 mutex_exit(&spa->spa_proc_lock); 1166 1167 /* 1168 * We want to make sure spa_thread() has actually exited the ZFS 1169 * module, so that the module can't be unloaded out from underneath 1170 * it. 1171 */ 1172 if (spa->spa_did != 0) { 1173 thread_join(spa->spa_did); 1174 spa->spa_did = 0; 1175 } 1176 } 1177 1178 /* 1179 * Verify a pool configuration, and construct the vdev tree appropriately. This 1180 * will create all the necessary vdevs in the appropriate layout, with each vdev 1181 * in the CLOSED state. This will prep the pool before open/creation/import. 1182 * All vdev validation is done by the vdev_alloc() routine. 1183 */ 1184 static int 1185 spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, 1186 uint_t id, int atype) 1187 { 1188 nvlist_t **child; 1189 uint_t children; 1190 int error; 1191 1192 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) 1193 return (error); 1194 1195 if ((*vdp)->vdev_ops->vdev_op_leaf) 1196 return (0); 1197 1198 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1199 &child, &children); 1200 1201 if (error == ENOENT) 1202 return (0); 1203 1204 if (error) { 1205 vdev_free(*vdp); 1206 *vdp = NULL; 1207 return (SET_ERROR(EINVAL)); 1208 } 1209 1210 for (int c = 0; c < children; c++) { 1211 vdev_t *vd; 1212 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, 1213 atype)) != 0) { 1214 vdev_free(*vdp); 1215 *vdp = NULL; 1216 return (error); 1217 } 1218 } 1219 1220 ASSERT(*vdp != NULL); 1221 1222 return (0); 1223 } 1224 1225 /* 1226 * Opposite of spa_load(). 1227 */ 1228 static void 1229 spa_unload(spa_t *spa) 1230 { 1231 int i; 1232 1233 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1234 1235 /* 1236 * Stop async tasks. 1237 */ 1238 spa_async_suspend(spa); 1239 1240 /* 1241 * Stop syncing. 1242 */ 1243 if (spa->spa_sync_on) { 1244 txg_sync_stop(spa->spa_dsl_pool); 1245 spa->spa_sync_on = B_FALSE; 1246 } 1247 1248 /* 1249 * Wait for any outstanding async I/O to complete. 1250 */ 1251 if (spa->spa_async_zio_root != NULL) { 1252 for (int i = 0; i < max_ncpus; i++) 1253 (void) zio_wait(spa->spa_async_zio_root[i]); 1254 kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); 1255 spa->spa_async_zio_root = NULL; 1256 } 1257 1258 bpobj_close(&spa->spa_deferred_bpobj); 1259 1260 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1261 1262 /* 1263 * Close all vdevs. 1264 */ 1265 if (spa->spa_root_vdev) 1266 vdev_free(spa->spa_root_vdev); 1267 ASSERT(spa->spa_root_vdev == NULL); 1268 1269 /* 1270 * Close the dsl pool. 1271 */ 1272 if (spa->spa_dsl_pool) { 1273 dsl_pool_close(spa->spa_dsl_pool); 1274 spa->spa_dsl_pool = NULL; 1275 spa->spa_meta_objset = NULL; 1276 } 1277 1278 ddt_unload(spa); 1279 1280 1281 /* 1282 * Drop and purge level 2 cache 1283 */ 1284 spa_l2cache_drop(spa); 1285 1286 for (i = 0; i < spa->spa_spares.sav_count; i++) 1287 vdev_free(spa->spa_spares.sav_vdevs[i]); 1288 if (spa->spa_spares.sav_vdevs) { 1289 kmem_free(spa->spa_spares.sav_vdevs, 1290 spa->spa_spares.sav_count * sizeof (void *)); 1291 spa->spa_spares.sav_vdevs = NULL; 1292 } 1293 if (spa->spa_spares.sav_config) { 1294 nvlist_free(spa->spa_spares.sav_config); 1295 spa->spa_spares.sav_config = NULL; 1296 } 1297 spa->spa_spares.sav_count = 0; 1298 1299 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 1300 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); 1301 vdev_free(spa->spa_l2cache.sav_vdevs[i]); 1302 } 1303 if (spa->spa_l2cache.sav_vdevs) { 1304 kmem_free(spa->spa_l2cache.sav_vdevs, 1305 spa->spa_l2cache.sav_count * sizeof (void *)); 1306 spa->spa_l2cache.sav_vdevs = NULL; 1307 } 1308 if (spa->spa_l2cache.sav_config) { 1309 nvlist_free(spa->spa_l2cache.sav_config); 1310 spa->spa_l2cache.sav_config = NULL; 1311 } 1312 spa->spa_l2cache.sav_count = 0; 1313 1314 spa->spa_async_suspended = 0; 1315 1316 if (spa->spa_comment != NULL) { 1317 spa_strfree(spa->spa_comment); 1318 spa->spa_comment = NULL; 1319 } 1320 1321 spa_config_exit(spa, SCL_ALL, FTAG); 1322 } 1323 1324 /* 1325 * Load (or re-load) the current list of vdevs describing the active spares for 1326 * this pool. When this is called, we have some form of basic information in 1327 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and 1328 * then re-generate a more complete list including status information. 1329 */ 1330 static void 1331 spa_load_spares(spa_t *spa) 1332 { 1333 nvlist_t **spares; 1334 uint_t nspares; 1335 int i; 1336 vdev_t *vd, *tvd; 1337 1338 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1339 1340 /* 1341 * First, close and free any existing spare vdevs. 1342 */ 1343 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1344 vd = spa->spa_spares.sav_vdevs[i]; 1345 1346 /* Undo the call to spa_activate() below */ 1347 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1348 B_FALSE)) != NULL && tvd->vdev_isspare) 1349 spa_spare_remove(tvd); 1350 vdev_close(vd); 1351 vdev_free(vd); 1352 } 1353 1354 if (spa->spa_spares.sav_vdevs) 1355 kmem_free(spa->spa_spares.sav_vdevs, 1356 spa->spa_spares.sav_count * sizeof (void *)); 1357 1358 if (spa->spa_spares.sav_config == NULL) 1359 nspares = 0; 1360 else 1361 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 1362 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 1363 1364 spa->spa_spares.sav_count = (int)nspares; 1365 spa->spa_spares.sav_vdevs = NULL; 1366 1367 if (nspares == 0) 1368 return; 1369 1370 /* 1371 * Construct the array of vdevs, opening them to get status in the 1372 * process. For each spare, there is potentially two different vdev_t 1373 * structures associated with it: one in the list of spares (used only 1374 * for basic validation purposes) and one in the active vdev 1375 * configuration (if it's spared in). During this phase we open and 1376 * validate each vdev on the spare list. If the vdev also exists in the 1377 * active configuration, then we also mark this vdev as an active spare. 1378 */ 1379 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *), 1380 KM_SLEEP); 1381 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1382 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, 1383 VDEV_ALLOC_SPARE) == 0); 1384 ASSERT(vd != NULL); 1385 1386 spa->spa_spares.sav_vdevs[i] = vd; 1387 1388 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1389 B_FALSE)) != NULL) { 1390 if (!tvd->vdev_isspare) 1391 spa_spare_add(tvd); 1392 1393 /* 1394 * We only mark the spare active if we were successfully 1395 * able to load the vdev. Otherwise, importing a pool 1396 * with a bad active spare would result in strange 1397 * behavior, because multiple pool would think the spare 1398 * is actively in use. 1399 * 1400 * There is a vulnerability here to an equally bizarre 1401 * circumstance, where a dead active spare is later 1402 * brought back to life (onlined or otherwise). Given 1403 * the rarity of this scenario, and the extra complexity 1404 * it adds, we ignore the possibility. 1405 */ 1406 if (!vdev_is_dead(tvd)) 1407 spa_spare_activate(tvd); 1408 } 1409 1410 vd->vdev_top = vd; 1411 vd->vdev_aux = &spa->spa_spares; 1412 1413 if (vdev_open(vd) != 0) 1414 continue; 1415 1416 if (vdev_validate_aux(vd) == 0) 1417 spa_spare_add(vd); 1418 } 1419 1420 /* 1421 * Recompute the stashed list of spares, with status information 1422 * this time. 1423 */ 1424 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, 1425 DATA_TYPE_NVLIST_ARRAY) == 0); 1426 1427 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), 1428 KM_SLEEP); 1429 for (i = 0; i < spa->spa_spares.sav_count; i++) 1430 spares[i] = vdev_config_generate(spa, 1431 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); 1432 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 1433 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); 1434 for (i = 0; i < spa->spa_spares.sav_count; i++) 1435 nvlist_free(spares[i]); 1436 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); 1437 } 1438 1439 /* 1440 * Load (or re-load) the current list of vdevs describing the active l2cache for 1441 * this pool. When this is called, we have some form of basic information in 1442 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and 1443 * then re-generate a more complete list including status information. 1444 * Devices which are already active have their details maintained, and are 1445 * not re-opened. 1446 */ 1447 static void 1448 spa_load_l2cache(spa_t *spa) 1449 { 1450 nvlist_t **l2cache; 1451 uint_t nl2cache; 1452 int i, j, oldnvdevs; 1453 uint64_t guid; 1454 vdev_t *vd, **oldvdevs, **newvdevs; 1455 spa_aux_vdev_t *sav = &spa->spa_l2cache; 1456 1457 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1458 1459 if (sav->sav_config != NULL) { 1460 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 1461 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 1462 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); 1463 } else { 1464 nl2cache = 0; 1465 newvdevs = NULL; 1466 } 1467 1468 oldvdevs = sav->sav_vdevs; 1469 oldnvdevs = sav->sav_count; 1470 sav->sav_vdevs = NULL; 1471 sav->sav_count = 0; 1472 1473 /* 1474 * Process new nvlist of vdevs. 1475 */ 1476 for (i = 0; i < nl2cache; i++) { 1477 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, 1478 &guid) == 0); 1479 1480 newvdevs[i] = NULL; 1481 for (j = 0; j < oldnvdevs; j++) { 1482 vd = oldvdevs[j]; 1483 if (vd != NULL && guid == vd->vdev_guid) { 1484 /* 1485 * Retain previous vdev for add/remove ops. 1486 */ 1487 newvdevs[i] = vd; 1488 oldvdevs[j] = NULL; 1489 break; 1490 } 1491 } 1492 1493 if (newvdevs[i] == NULL) { 1494 /* 1495 * Create new vdev 1496 */ 1497 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, 1498 VDEV_ALLOC_L2CACHE) == 0); 1499 ASSERT(vd != NULL); 1500 newvdevs[i] = vd; 1501 1502 /* 1503 * Commit this vdev as an l2cache device, 1504 * even if it fails to open. 1505 */ 1506 spa_l2cache_add(vd); 1507 1508 vd->vdev_top = vd; 1509 vd->vdev_aux = sav; 1510 1511 spa_l2cache_activate(vd); 1512 1513 if (vdev_open(vd) != 0) 1514 continue; 1515 1516 (void) vdev_validate_aux(vd); 1517 1518 if (!vdev_is_dead(vd)) 1519 l2arc_add_vdev(spa, vd); 1520 } 1521 } 1522 1523 /* 1524 * Purge vdevs that were dropped 1525 */ 1526 for (i = 0; i < oldnvdevs; i++) { 1527 uint64_t pool; 1528 1529 vd = oldvdevs[i]; 1530 if (vd != NULL) { 1531 ASSERT(vd->vdev_isl2cache); 1532 1533 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 1534 pool != 0ULL && l2arc_vdev_present(vd)) 1535 l2arc_remove_vdev(vd); 1536 vdev_clear_stats(vd); 1537 vdev_free(vd); 1538 } 1539 } 1540 1541 if (oldvdevs) 1542 kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); 1543 1544 if (sav->sav_config == NULL) 1545 goto out; 1546 1547 sav->sav_vdevs = newvdevs; 1548 sav->sav_count = (int)nl2cache; 1549 1550 /* 1551 * Recompute the stashed list of l2cache devices, with status 1552 * information this time. 1553 */ 1554 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, 1555 DATA_TYPE_NVLIST_ARRAY) == 0); 1556 1557 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 1558 for (i = 0; i < sav->sav_count; i++) 1559 l2cache[i] = vdev_config_generate(spa, 1560 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); 1561 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 1562 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); 1563 out: 1564 for (i = 0; i < sav->sav_count; i++) 1565 nvlist_free(l2cache[i]); 1566 if (sav->sav_count) 1567 kmem_free(l2cache, sav->sav_count * sizeof (void *)); 1568 } 1569 1570 static int 1571 load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) 1572 { 1573 dmu_buf_t *db; 1574 char *packed = NULL; 1575 size_t nvsize = 0; 1576 int error; 1577 *value = NULL; 1578 1579 error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); 1580 if (error != 0) 1581 return (error); 1582 1583 nvsize = *(uint64_t *)db->db_data; 1584 dmu_buf_rele(db, FTAG); 1585 1586 packed = kmem_alloc(nvsize, KM_SLEEP); 1587 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, 1588 DMU_READ_PREFETCH); 1589 if (error == 0) 1590 error = nvlist_unpack(packed, nvsize, value, 0); 1591 kmem_free(packed, nvsize); 1592 1593 return (error); 1594 } 1595 1596 /* 1597 * Checks to see if the given vdev could not be opened, in which case we post a 1598 * sysevent to notify the autoreplace code that the device has been removed. 1599 */ 1600 static void 1601 spa_check_removed(vdev_t *vd) 1602 { 1603 for (int c = 0; c < vd->vdev_children; c++) 1604 spa_check_removed(vd->vdev_child[c]); 1605 1606 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && 1607 !vd->vdev_ishole) { 1608 zfs_post_autoreplace(vd->vdev_spa, vd); 1609 spa_event_notify(vd->vdev_spa, vd, ESC_ZFS_VDEV_CHECK); 1610 } 1611 } 1612 1613 static void 1614 spa_config_valid_zaps(vdev_t *vd, vdev_t *mvd) 1615 { 1616 ASSERT3U(vd->vdev_children, ==, mvd->vdev_children); 1617 1618 vd->vdev_top_zap = mvd->vdev_top_zap; 1619 vd->vdev_leaf_zap = mvd->vdev_leaf_zap; 1620 1621 for (uint64_t i = 0; i < vd->vdev_children; i++) { 1622 spa_config_valid_zaps(vd->vdev_child[i], mvd->vdev_child[i]); 1623 } 1624 } 1625 1626 /* 1627 * Validate the current config against the MOS config 1628 */ 1629 static boolean_t 1630 spa_config_valid(spa_t *spa, nvlist_t *config) 1631 { 1632 vdev_t *mrvd, *rvd = spa->spa_root_vdev; 1633 nvlist_t *nv; 1634 1635 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) == 0); 1636 1637 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1638 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); 1639 1640 ASSERT3U(rvd->vdev_children, ==, mrvd->vdev_children); 1641 1642 /* 1643 * If we're doing a normal import, then build up any additional 1644 * diagnostic information about missing devices in this config. 1645 * We'll pass this up to the user for further processing. 1646 */ 1647 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { 1648 nvlist_t **child, *nv; 1649 uint64_t idx = 0; 1650 1651 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **), 1652 KM_SLEEP); 1653 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1654 1655 for (int c = 0; c < rvd->vdev_children; c++) { 1656 vdev_t *tvd = rvd->vdev_child[c]; 1657 vdev_t *mtvd = mrvd->vdev_child[c]; 1658 1659 if (tvd->vdev_ops == &vdev_missing_ops && 1660 mtvd->vdev_ops != &vdev_missing_ops && 1661 mtvd->vdev_islog) 1662 child[idx++] = vdev_config_generate(spa, mtvd, 1663 B_FALSE, 0); 1664 } 1665 1666 if (idx) { 1667 VERIFY(nvlist_add_nvlist_array(nv, 1668 ZPOOL_CONFIG_CHILDREN, child, idx) == 0); 1669 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 1670 ZPOOL_CONFIG_MISSING_DEVICES, nv) == 0); 1671 1672 for (int i = 0; i < idx; i++) 1673 nvlist_free(child[i]); 1674 } 1675 nvlist_free(nv); 1676 kmem_free(child, rvd->vdev_children * sizeof (char **)); 1677 } 1678 1679 /* 1680 * Compare the root vdev tree with the information we have 1681 * from the MOS config (mrvd). Check each top-level vdev 1682 * with the corresponding MOS config top-level (mtvd). 1683 */ 1684 for (int c = 0; c < rvd->vdev_children; c++) { 1685 vdev_t *tvd = rvd->vdev_child[c]; 1686 vdev_t *mtvd = mrvd->vdev_child[c]; 1687 1688 /* 1689 * Resolve any "missing" vdevs in the current configuration. 1690 * If we find that the MOS config has more accurate information 1691 * about the top-level vdev then use that vdev instead. 1692 */ 1693 if (tvd->vdev_ops == &vdev_missing_ops && 1694 mtvd->vdev_ops != &vdev_missing_ops) { 1695 1696 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) 1697 continue; 1698 1699 /* 1700 * Device specific actions. 1701 */ 1702 if (mtvd->vdev_islog) { 1703 spa_set_log_state(spa, SPA_LOG_CLEAR); 1704 } else { 1705 /* 1706 * XXX - once we have 'readonly' pool 1707 * support we should be able to handle 1708 * missing data devices by transitioning 1709 * the pool to readonly. 1710 */ 1711 continue; 1712 } 1713 1714 /* 1715 * Swap the missing vdev with the data we were 1716 * able to obtain from the MOS config. 1717 */ 1718 vdev_remove_child(rvd, tvd); 1719 vdev_remove_child(mrvd, mtvd); 1720 1721 vdev_add_child(rvd, mtvd); 1722 vdev_add_child(mrvd, tvd); 1723 1724 spa_config_exit(spa, SCL_ALL, FTAG); 1725 vdev_load(mtvd); 1726 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1727 1728 vdev_reopen(rvd); 1729 } else { 1730 if (mtvd->vdev_islog) { 1731 /* 1732 * Load the slog device's state from the MOS 1733 * config since it's possible that the label 1734 * does not contain the most up-to-date 1735 * information. 1736 */ 1737 vdev_load_log_state(tvd, mtvd); 1738 vdev_reopen(tvd); 1739 } 1740 1741 /* 1742 * Per-vdev ZAP info is stored exclusively in the MOS. 1743 */ 1744 spa_config_valid_zaps(tvd, mtvd); 1745 } 1746 } 1747 1748 vdev_free(mrvd); 1749 spa_config_exit(spa, SCL_ALL, FTAG); 1750 1751 /* 1752 * Ensure we were able to validate the config. 1753 */ 1754 return (rvd->vdev_guid_sum == spa->spa_uberblock.ub_guid_sum); 1755 } 1756 1757 /* 1758 * Check for missing log devices 1759 */ 1760 static boolean_t 1761 spa_check_logs(spa_t *spa) 1762 { 1763 boolean_t rv = B_FALSE; 1764 dsl_pool_t *dp = spa_get_dsl(spa); 1765 1766 switch (spa->spa_log_state) { 1767 case SPA_LOG_MISSING: 1768 /* need to recheck in case slog has been restored */ 1769 case SPA_LOG_UNKNOWN: 1770 rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 1771 zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0); 1772 if (rv) 1773 spa_set_log_state(spa, SPA_LOG_MISSING); 1774 break; 1775 } 1776 return (rv); 1777 } 1778 1779 static boolean_t 1780 spa_passivate_log(spa_t *spa) 1781 { 1782 vdev_t *rvd = spa->spa_root_vdev; 1783 boolean_t slog_found = B_FALSE; 1784 1785 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1786 1787 if (!spa_has_slogs(spa)) 1788 return (B_FALSE); 1789 1790 for (int c = 0; c < rvd->vdev_children; c++) { 1791 vdev_t *tvd = rvd->vdev_child[c]; 1792 metaslab_group_t *mg = tvd->vdev_mg; 1793 1794 if (tvd->vdev_islog) { 1795 metaslab_group_passivate(mg); 1796 slog_found = B_TRUE; 1797 } 1798 } 1799 1800 return (slog_found); 1801 } 1802 1803 static void 1804 spa_activate_log(spa_t *spa) 1805 { 1806 vdev_t *rvd = spa->spa_root_vdev; 1807 1808 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1809 1810 for (int c = 0; c < rvd->vdev_children; c++) { 1811 vdev_t *tvd = rvd->vdev_child[c]; 1812 metaslab_group_t *mg = tvd->vdev_mg; 1813 1814 if (tvd->vdev_islog) 1815 metaslab_group_activate(mg); 1816 } 1817 } 1818 1819 int 1820 spa_offline_log(spa_t *spa) 1821 { 1822 int error; 1823 1824 error = dmu_objset_find(spa_name(spa), zil_vdev_offline, 1825 NULL, DS_FIND_CHILDREN); 1826 if (error == 0) { 1827 /* 1828 * We successfully offlined the log device, sync out the 1829 * current txg so that the "stubby" block can be removed 1830 * by zil_sync(). 1831 */ 1832 txg_wait_synced(spa->spa_dsl_pool, 0); 1833 } 1834 return (error); 1835 } 1836 1837 static void 1838 spa_aux_check_removed(spa_aux_vdev_t *sav) 1839 { 1840 for (int i = 0; i < sav->sav_count; i++) 1841 spa_check_removed(sav->sav_vdevs[i]); 1842 } 1843 1844 void 1845 spa_claim_notify(zio_t *zio) 1846 { 1847 spa_t *spa = zio->io_spa; 1848 1849 if (zio->io_error) 1850 return; 1851 1852 mutex_enter(&spa->spa_props_lock); /* any mutex will do */ 1853 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) 1854 spa->spa_claim_max_txg = zio->io_bp->blk_birth; 1855 mutex_exit(&spa->spa_props_lock); 1856 } 1857 1858 typedef struct spa_load_error { 1859 uint64_t sle_meta_count; 1860 uint64_t sle_data_count; 1861 } spa_load_error_t; 1862 1863 static void 1864 spa_load_verify_done(zio_t *zio) 1865 { 1866 blkptr_t *bp = zio->io_bp; 1867 spa_load_error_t *sle = zio->io_private; 1868 dmu_object_type_t type = BP_GET_TYPE(bp); 1869 int error = zio->io_error; 1870 spa_t *spa = zio->io_spa; 1871 1872 if (error) { 1873 if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && 1874 type != DMU_OT_INTENT_LOG) 1875 atomic_inc_64(&sle->sle_meta_count); 1876 else 1877 atomic_inc_64(&sle->sle_data_count); 1878 } 1879 zio_data_buf_free(zio->io_data, zio->io_size); 1880 1881 mutex_enter(&spa->spa_scrub_lock); 1882 spa->spa_scrub_inflight--; 1883 cv_broadcast(&spa->spa_scrub_io_cv); 1884 mutex_exit(&spa->spa_scrub_lock); 1885 } 1886 1887 /* 1888 * Maximum number of concurrent scrub i/os to create while verifying 1889 * a pool while importing it. 1890 */ 1891 int spa_load_verify_maxinflight = 10000; 1892 boolean_t spa_load_verify_metadata = B_TRUE; 1893 boolean_t spa_load_verify_data = B_TRUE; 1894 1895 /*ARGSUSED*/ 1896 static int 1897 spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1898 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1899 { 1900 if (bp == NULL || BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 1901 return (0); 1902 /* 1903 * Note: normally this routine will not be called if 1904 * spa_load_verify_metadata is not set. However, it may be useful 1905 * to manually set the flag after the traversal has begun. 1906 */ 1907 if (!spa_load_verify_metadata) 1908 return (0); 1909 if (BP_GET_BUFC_TYPE(bp) == ARC_BUFC_DATA && !spa_load_verify_data) 1910 return (0); 1911 1912 zio_t *rio = arg; 1913 size_t size = BP_GET_PSIZE(bp); 1914 void *data = zio_data_buf_alloc(size); 1915 1916 mutex_enter(&spa->spa_scrub_lock); 1917 while (spa->spa_scrub_inflight >= spa_load_verify_maxinflight) 1918 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 1919 spa->spa_scrub_inflight++; 1920 mutex_exit(&spa->spa_scrub_lock); 1921 1922 zio_nowait(zio_read(rio, spa, bp, data, size, 1923 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, 1924 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | 1925 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); 1926 return (0); 1927 } 1928 1929 /* ARGSUSED */ 1930 int 1931 verify_dataset_name_len(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) 1932 { 1933 char namebuf[MAXPATHLEN]; 1934 dsl_dataset_name(ds, namebuf); 1935 if (strlen(namebuf) > MAXNAMELEN) { 1936 return (SET_ERROR(ENAMETOOLONG)); 1937 } 1938 1939 return (0); 1940 } 1941 1942 static int 1943 spa_load_verify(spa_t *spa) 1944 { 1945 zio_t *rio; 1946 spa_load_error_t sle = { 0 }; 1947 zpool_rewind_policy_t policy; 1948 boolean_t verify_ok = B_FALSE; 1949 int error = 0; 1950 1951 zpool_get_rewind_policy(spa->spa_config, &policy); 1952 1953 if (policy.zrp_request & ZPOOL_NEVER_REWIND) 1954 return (0); 1955 1956 dsl_pool_config_enter(spa->spa_dsl_pool, FTAG); 1957 error = dmu_objset_find_dp(spa->spa_dsl_pool, 1958 spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL, 1959 DS_FIND_CHILDREN); 1960 dsl_pool_config_exit(spa->spa_dsl_pool, FTAG); 1961 if (error != 0) 1962 return (error); 1963 1964 rio = zio_root(spa, NULL, &sle, 1965 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 1966 1967 if (spa_load_verify_metadata) { 1968 error = traverse_pool(spa, spa->spa_verify_min_txg, 1969 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 1970 spa_load_verify_cb, rio); 1971 } 1972 1973 (void) zio_wait(rio); 1974 1975 spa->spa_load_meta_errors = sle.sle_meta_count; 1976 spa->spa_load_data_errors = sle.sle_data_count; 1977 1978 if (!error && sle.sle_meta_count <= policy.zrp_maxmeta && 1979 sle.sle_data_count <= policy.zrp_maxdata) { 1980 int64_t loss = 0; 1981 1982 verify_ok = B_TRUE; 1983 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 1984 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 1985 1986 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 1987 VERIFY(nvlist_add_uint64(spa->spa_load_info, 1988 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 1989 VERIFY(nvlist_add_int64(spa->spa_load_info, 1990 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 1991 VERIFY(nvlist_add_uint64(spa->spa_load_info, 1992 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 1993 } else { 1994 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 1995 } 1996 1997 if (error) { 1998 if (error != ENXIO && error != EIO) 1999 error = SET_ERROR(EIO); 2000 return (error); 2001 } 2002 2003 return (verify_ok ? 0 : EIO); 2004 } 2005 2006 /* 2007 * Find a value in the pool props object. 2008 */ 2009 static void 2010 spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2011 { 2012 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2013 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2014 } 2015 2016 /* 2017 * Find a value in the pool directory object. 2018 */ 2019 static int 2020 spa_dir_prop(spa_t *spa, const char *name, uint64_t *val) 2021 { 2022 return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2023 name, sizeof (uint64_t), 1, val)); 2024 } 2025 2026 static int 2027 spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2028 { 2029 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2030 return (err); 2031 } 2032 2033 /* 2034 * Fix up config after a partly-completed split. This is done with the 2035 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2036 * pool have that entry in their config, but only the splitting one contains 2037 * a list of all the guids of the vdevs that are being split off. 2038 * 2039 * This function determines what to do with that list: either rejoin 2040 * all the disks to the pool, or complete the splitting process. To attempt 2041 * the rejoin, each disk that is offlined is marked online again, and 2042 * we do a reopen() call. If the vdev label for every disk that was 2043 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2044 * then we call vdev_split() on each disk, and complete the split. 2045 * 2046 * Otherwise we leave the config alone, with all the vdevs in place in 2047 * the original pool. 2048 */ 2049 static void 2050 spa_try_repair(spa_t *spa, nvlist_t *config) 2051 { 2052 uint_t extracted; 2053 uint64_t *glist; 2054 uint_t i, gcount; 2055 nvlist_t *nvl; 2056 vdev_t **vd; 2057 boolean_t attempt_reopen; 2058 2059 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2060 return; 2061 2062 /* check that the config is complete */ 2063 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2064 &glist, &gcount) != 0) 2065 return; 2066 2067 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2068 2069 /* attempt to online all the vdevs & validate */ 2070 attempt_reopen = B_TRUE; 2071 for (i = 0; i < gcount; i++) { 2072 if (glist[i] == 0) /* vdev is hole */ 2073 continue; 2074 2075 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2076 if (vd[i] == NULL) { 2077 /* 2078 * Don't bother attempting to reopen the disks; 2079 * just do the split. 2080 */ 2081 attempt_reopen = B_FALSE; 2082 } else { 2083 /* attempt to re-online it */ 2084 vd[i]->vdev_offline = B_FALSE; 2085 } 2086 } 2087 2088 if (attempt_reopen) { 2089 vdev_reopen(spa->spa_root_vdev); 2090 2091 /* check each device to see what state it's in */ 2092 for (extracted = 0, i = 0; i < gcount; i++) { 2093 if (vd[i] != NULL && 2094 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2095 break; 2096 ++extracted; 2097 } 2098 } 2099 2100 /* 2101 * If every disk has been moved to the new pool, or if we never 2102 * even attempted to look at them, then we split them off for 2103 * good. 2104 */ 2105 if (!attempt_reopen || gcount == extracted) { 2106 for (i = 0; i < gcount; i++) 2107 if (vd[i] != NULL) 2108 vdev_split(vd[i]); 2109 vdev_reopen(spa->spa_root_vdev); 2110 } 2111 2112 kmem_free(vd, gcount * sizeof (vdev_t *)); 2113 } 2114 2115 static int 2116 spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type, 2117 boolean_t mosconfig) 2118 { 2119 nvlist_t *config = spa->spa_config; 2120 char *ereport = FM_EREPORT_ZFS_POOL; 2121 char *comment; 2122 int error; 2123 uint64_t pool_guid; 2124 nvlist_t *nvl; 2125 2126 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) 2127 return (SET_ERROR(EINVAL)); 2128 2129 ASSERT(spa->spa_comment == NULL); 2130 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2131 spa->spa_comment = spa_strdup(comment); 2132 2133 /* 2134 * Versioning wasn't explicitly added to the label until later, so if 2135 * it's not present treat it as the initial version. 2136 */ 2137 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2138 &spa->spa_ubsync.ub_version) != 0) 2139 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2140 2141 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2142 &spa->spa_config_txg); 2143 2144 if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) && 2145 spa_guid_exists(pool_guid, 0)) { 2146 error = SET_ERROR(EEXIST); 2147 } else { 2148 spa->spa_config_guid = pool_guid; 2149 2150 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, 2151 &nvl) == 0) { 2152 VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting, 2153 KM_SLEEP) == 0); 2154 } 2155 2156 nvlist_free(spa->spa_load_info); 2157 spa->spa_load_info = fnvlist_alloc(); 2158 2159 gethrestime(&spa->spa_loaded_ts); 2160 error = spa_load_impl(spa, pool_guid, config, state, type, 2161 mosconfig, &ereport); 2162 } 2163 2164 /* 2165 * Don't count references from objsets that are already closed 2166 * and are making their way through the eviction process. 2167 */ 2168 spa_evicting_os_wait(spa); 2169 spa->spa_minref = refcount_count(&spa->spa_refcount); 2170 if (error) { 2171 if (error != EEXIST) { 2172 spa->spa_loaded_ts.tv_sec = 0; 2173 spa->spa_loaded_ts.tv_nsec = 0; 2174 } 2175 if (error != EBADF) { 2176 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2177 } 2178 } 2179 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2180 spa->spa_ena = 0; 2181 2182 return (error); 2183 } 2184 2185 /* 2186 * Count the number of per-vdev ZAPs associated with all of the vdevs in the 2187 * vdev tree rooted in the given vd, and ensure that each ZAP is present in the 2188 * spa's per-vdev ZAP list. 2189 */ 2190 static uint64_t 2191 vdev_count_verify_zaps(vdev_t *vd) 2192 { 2193 spa_t *spa = vd->vdev_spa; 2194 uint64_t total = 0; 2195 if (vd->vdev_top_zap != 0) { 2196 total++; 2197 ASSERT0(zap_lookup_int(spa->spa_meta_objset, 2198 spa->spa_all_vdev_zaps, vd->vdev_top_zap)); 2199 } 2200 if (vd->vdev_leaf_zap != 0) { 2201 total++; 2202 ASSERT0(zap_lookup_int(spa->spa_meta_objset, 2203 spa->spa_all_vdev_zaps, vd->vdev_leaf_zap)); 2204 } 2205 2206 for (uint64_t i = 0; i < vd->vdev_children; i++) { 2207 total += vdev_count_verify_zaps(vd->vdev_child[i]); 2208 } 2209 2210 return (total); 2211 } 2212 2213 /* 2214 * Load an existing storage pool, using the pool's builtin spa_config as a 2215 * source of configuration information. 2216 */ 2217 static int 2218 spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config, 2219 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 2220 char **ereport) 2221 { 2222 int error = 0; 2223 nvlist_t *nvroot = NULL; 2224 nvlist_t *label; 2225 vdev_t *rvd; 2226 uberblock_t *ub = &spa->spa_uberblock; 2227 uint64_t children, config_cache_txg = spa->spa_config_txg; 2228 int orig_mode = spa->spa_mode; 2229 int parse; 2230 uint64_t obj; 2231 boolean_t missing_feat_write = B_FALSE; 2232 2233 /* 2234 * If this is an untrusted config, access the pool in read-only mode. 2235 * This prevents things like resilvering recently removed devices. 2236 */ 2237 if (!mosconfig) 2238 spa->spa_mode = FREAD; 2239 2240 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2241 2242 spa->spa_load_state = state; 2243 2244 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot)) 2245 return (SET_ERROR(EINVAL)); 2246 2247 parse = (type == SPA_IMPORT_EXISTING ? 2248 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2249 2250 /* 2251 * Create "The Godfather" zio to hold all async IOs 2252 */ 2253 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2254 KM_SLEEP); 2255 for (int i = 0; i < max_ncpus; i++) { 2256 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2257 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2258 ZIO_FLAG_GODFATHER); 2259 } 2260 2261 /* 2262 * Parse the configuration into a vdev tree. We explicitly set the 2263 * value that will be returned by spa_version() since parsing the 2264 * configuration requires knowing the version number. 2265 */ 2266 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2267 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse); 2268 spa_config_exit(spa, SCL_ALL, FTAG); 2269 2270 if (error != 0) 2271 return (error); 2272 2273 ASSERT(spa->spa_root_vdev == rvd); 2274 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2275 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2276 2277 if (type != SPA_IMPORT_ASSEMBLE) { 2278 ASSERT(spa_guid(spa) == pool_guid); 2279 } 2280 2281 /* 2282 * Try to open all vdevs, loading each label in the process. 2283 */ 2284 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2285 error = vdev_open(rvd); 2286 spa_config_exit(spa, SCL_ALL, FTAG); 2287 if (error != 0) 2288 return (error); 2289 2290 /* 2291 * We need to validate the vdev labels against the configuration that 2292 * we have in hand, which is dependent on the setting of mosconfig. If 2293 * mosconfig is true then we're validating the vdev labels based on 2294 * that config. Otherwise, we're validating against the cached config 2295 * (zpool.cache) that was read when we loaded the zfs module, and then 2296 * later we will recursively call spa_load() and validate against 2297 * the vdev config. 2298 * 2299 * If we're assembling a new pool that's been split off from an 2300 * existing pool, the labels haven't yet been updated so we skip 2301 * validation for now. 2302 */ 2303 if (type != SPA_IMPORT_ASSEMBLE) { 2304 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2305 error = vdev_validate(rvd, mosconfig); 2306 spa_config_exit(spa, SCL_ALL, FTAG); 2307 2308 if (error != 0) 2309 return (error); 2310 2311 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2312 return (SET_ERROR(ENXIO)); 2313 } 2314 2315 /* 2316 * Find the best uberblock. 2317 */ 2318 vdev_uberblock_load(rvd, ub, &label); 2319 2320 /* 2321 * If we weren't able to find a single valid uberblock, return failure. 2322 */ 2323 if (ub->ub_txg == 0) { 2324 nvlist_free(label); 2325 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2326 } 2327 2328 /* 2329 * If the pool has an unsupported version we can't open it. 2330 */ 2331 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2332 nvlist_free(label); 2333 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2334 } 2335 2336 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2337 nvlist_t *features; 2338 2339 /* 2340 * If we weren't able to find what's necessary for reading the 2341 * MOS in the label, return failure. 2342 */ 2343 if (label == NULL || nvlist_lookup_nvlist(label, 2344 ZPOOL_CONFIG_FEATURES_FOR_READ, &features) != 0) { 2345 nvlist_free(label); 2346 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2347 ENXIO)); 2348 } 2349 2350 /* 2351 * Update our in-core representation with the definitive values 2352 * from the label. 2353 */ 2354 nvlist_free(spa->spa_label_features); 2355 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2356 } 2357 2358 nvlist_free(label); 2359 2360 /* 2361 * Look through entries in the label nvlist's features_for_read. If 2362 * there is a feature listed there which we don't understand then we 2363 * cannot open a pool. 2364 */ 2365 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2366 nvlist_t *unsup_feat; 2367 2368 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2369 0); 2370 2371 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2372 NULL); nvp != NULL; 2373 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2374 if (!zfeature_is_supported(nvpair_name(nvp))) { 2375 VERIFY(nvlist_add_string(unsup_feat, 2376 nvpair_name(nvp), "") == 0); 2377 } 2378 } 2379 2380 if (!nvlist_empty(unsup_feat)) { 2381 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2382 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2383 nvlist_free(unsup_feat); 2384 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2385 ENOTSUP)); 2386 } 2387 2388 nvlist_free(unsup_feat); 2389 } 2390 2391 /* 2392 * If the vdev guid sum doesn't match the uberblock, we have an 2393 * incomplete configuration. We first check to see if the pool 2394 * is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN). 2395 * If it is, defer the vdev_guid_sum check till later so we 2396 * can handle missing vdevs. 2397 */ 2398 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, 2399 &children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE && 2400 rvd->vdev_guid_sum != ub->ub_guid_sum) 2401 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2402 2403 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2404 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2405 spa_try_repair(spa, config); 2406 spa_config_exit(spa, SCL_ALL, FTAG); 2407 nvlist_free(spa->spa_config_splitting); 2408 spa->spa_config_splitting = NULL; 2409 } 2410 2411 /* 2412 * Initialize internal SPA structures. 2413 */ 2414 spa->spa_state = POOL_STATE_ACTIVE; 2415 spa->spa_ubsync = spa->spa_uberblock; 2416 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2417 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2418 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2419 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2420 spa->spa_claim_max_txg = spa->spa_first_txg; 2421 spa->spa_prev_software_version = ub->ub_software_version; 2422 2423 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2424 if (error) 2425 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2426 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2427 2428 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0) 2429 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2430 2431 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2432 boolean_t missing_feat_read = B_FALSE; 2433 nvlist_t *unsup_feat, *enabled_feat; 2434 2435 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2436 &spa->spa_feat_for_read_obj) != 0) { 2437 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2438 } 2439 2440 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2441 &spa->spa_feat_for_write_obj) != 0) { 2442 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2443 } 2444 2445 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 2446 &spa->spa_feat_desc_obj) != 0) { 2447 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2448 } 2449 2450 enabled_feat = fnvlist_alloc(); 2451 unsup_feat = fnvlist_alloc(); 2452 2453 if (!spa_features_check(spa, B_FALSE, 2454 unsup_feat, enabled_feat)) 2455 missing_feat_read = B_TRUE; 2456 2457 if (spa_writeable(spa) || state == SPA_LOAD_TRYIMPORT) { 2458 if (!spa_features_check(spa, B_TRUE, 2459 unsup_feat, enabled_feat)) { 2460 missing_feat_write = B_TRUE; 2461 } 2462 } 2463 2464 fnvlist_add_nvlist(spa->spa_load_info, 2465 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 2466 2467 if (!nvlist_empty(unsup_feat)) { 2468 fnvlist_add_nvlist(spa->spa_load_info, 2469 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 2470 } 2471 2472 fnvlist_free(enabled_feat); 2473 fnvlist_free(unsup_feat); 2474 2475 if (!missing_feat_read) { 2476 fnvlist_add_boolean(spa->spa_load_info, 2477 ZPOOL_CONFIG_CAN_RDONLY); 2478 } 2479 2480 /* 2481 * If the state is SPA_LOAD_TRYIMPORT, our objective is 2482 * twofold: to determine whether the pool is available for 2483 * import in read-write mode and (if it is not) whether the 2484 * pool is available for import in read-only mode. If the pool 2485 * is available for import in read-write mode, it is displayed 2486 * as available in userland; if it is not available for import 2487 * in read-only mode, it is displayed as unavailable in 2488 * userland. If the pool is available for import in read-only 2489 * mode but not read-write mode, it is displayed as unavailable 2490 * in userland with a special note that the pool is actually 2491 * available for open in read-only mode. 2492 * 2493 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 2494 * missing a feature for write, we must first determine whether 2495 * the pool can be opened read-only before returning to 2496 * userland in order to know whether to display the 2497 * abovementioned note. 2498 */ 2499 if (missing_feat_read || (missing_feat_write && 2500 spa_writeable(spa))) { 2501 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2502 ENOTSUP)); 2503 } 2504 2505 /* 2506 * Load refcounts for ZFS features from disk into an in-memory 2507 * cache during SPA initialization. 2508 */ 2509 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 2510 uint64_t refcount; 2511 2512 error = feature_get_refcount_from_disk(spa, 2513 &spa_feature_table[i], &refcount); 2514 if (error == 0) { 2515 spa->spa_feat_refcount_cache[i] = refcount; 2516 } else if (error == ENOTSUP) { 2517 spa->spa_feat_refcount_cache[i] = 2518 SPA_FEATURE_DISABLED; 2519 } else { 2520 return (spa_vdev_err(rvd, 2521 VDEV_AUX_CORRUPT_DATA, EIO)); 2522 } 2523 } 2524 } 2525 2526 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 2527 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 2528 &spa->spa_feat_enabled_txg_obj) != 0) 2529 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2530 } 2531 2532 spa->spa_is_initializing = B_TRUE; 2533 error = dsl_pool_open(spa->spa_dsl_pool); 2534 spa->spa_is_initializing = B_FALSE; 2535 if (error != 0) 2536 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2537 2538 if (!mosconfig) { 2539 uint64_t hostid; 2540 nvlist_t *policy = NULL, *nvconfig; 2541 2542 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2543 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2544 2545 if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig, 2546 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2547 char *hostname; 2548 unsigned long myhostid = 0; 2549 2550 VERIFY(nvlist_lookup_string(nvconfig, 2551 ZPOOL_CONFIG_HOSTNAME, &hostname) == 0); 2552 2553 #ifdef _KERNEL 2554 myhostid = zone_get_hostid(NULL); 2555 #else /* _KERNEL */ 2556 /* 2557 * We're emulating the system's hostid in userland, so 2558 * we can't use zone_get_hostid(). 2559 */ 2560 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid); 2561 #endif /* _KERNEL */ 2562 if (hostid != 0 && myhostid != 0 && 2563 hostid != myhostid) { 2564 nvlist_free(nvconfig); 2565 cmn_err(CE_WARN, "pool '%s' could not be " 2566 "loaded as it was last accessed by " 2567 "another system (host: %s hostid: 0x%lx). " 2568 "See: http://illumos.org/msg/ZFS-8000-EY", 2569 spa_name(spa), hostname, 2570 (unsigned long)hostid); 2571 return (SET_ERROR(EBADF)); 2572 } 2573 } 2574 if (nvlist_lookup_nvlist(spa->spa_config, 2575 ZPOOL_REWIND_POLICY, &policy) == 0) 2576 VERIFY(nvlist_add_nvlist(nvconfig, 2577 ZPOOL_REWIND_POLICY, policy) == 0); 2578 2579 spa_config_set(spa, nvconfig); 2580 spa_unload(spa); 2581 spa_deactivate(spa); 2582 spa_activate(spa, orig_mode); 2583 2584 return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE)); 2585 } 2586 2587 /* Grab the secret checksum salt from the MOS. */ 2588 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2589 DMU_POOL_CHECKSUM_SALT, 1, 2590 sizeof (spa->spa_cksum_salt.zcs_bytes), 2591 spa->spa_cksum_salt.zcs_bytes); 2592 if (error == ENOENT) { 2593 /* Generate a new salt for subsequent use */ 2594 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 2595 sizeof (spa->spa_cksum_salt.zcs_bytes)); 2596 } else if (error != 0) { 2597 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2598 } 2599 2600 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0) 2601 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2602 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 2603 if (error != 0) 2604 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2605 2606 /* 2607 * Load the bit that tells us to use the new accounting function 2608 * (raid-z deflation). If we have an older pool, this will not 2609 * be present. 2610 */ 2611 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate); 2612 if (error != 0 && error != ENOENT) 2613 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2614 2615 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 2616 &spa->spa_creation_version); 2617 if (error != 0 && error != ENOENT) 2618 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2619 2620 /* 2621 * Load the persistent error log. If we have an older pool, this will 2622 * not be present. 2623 */ 2624 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last); 2625 if (error != 0 && error != ENOENT) 2626 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2627 2628 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 2629 &spa->spa_errlog_scrub); 2630 if (error != 0 && error != ENOENT) 2631 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2632 2633 /* 2634 * Load the history object. If we have an older pool, this 2635 * will not be present. 2636 */ 2637 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history); 2638 if (error != 0 && error != ENOENT) 2639 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2640 2641 /* 2642 * Load the per-vdev ZAP map. If we have an older pool, this will not 2643 * be present; in this case, defer its creation to a later time to 2644 * avoid dirtying the MOS this early / out of sync context. See 2645 * spa_sync_config_object. 2646 */ 2647 2648 /* The sentinel is only available in the MOS config. */ 2649 nvlist_t *mos_config; 2650 if (load_nvlist(spa, spa->spa_config_object, &mos_config) != 0) 2651 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2652 2653 error = spa_dir_prop(spa, DMU_POOL_VDEV_ZAP_MAP, 2654 &spa->spa_all_vdev_zaps); 2655 2656 if (error != ENOENT && error != 0) { 2657 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2658 } else if (error == 0 && !nvlist_exists(mos_config, 2659 ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)) { 2660 /* 2661 * An older version of ZFS overwrote the sentinel value, so 2662 * we have orphaned per-vdev ZAPs in the MOS. Defer their 2663 * destruction to later; see spa_sync_config_object. 2664 */ 2665 spa->spa_avz_action = AVZ_ACTION_DESTROY; 2666 /* 2667 * We're assuming that no vdevs have had their ZAPs created 2668 * before this. Better be sure of it. 2669 */ 2670 ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); 2671 } 2672 nvlist_free(mos_config); 2673 2674 /* 2675 * If we're assembling the pool from the split-off vdevs of 2676 * an existing pool, we don't want to attach the spares & cache 2677 * devices. 2678 */ 2679 2680 /* 2681 * Load any hot spares for this pool. 2682 */ 2683 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object); 2684 if (error != 0 && error != ENOENT) 2685 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2686 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2687 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 2688 if (load_nvlist(spa, spa->spa_spares.sav_object, 2689 &spa->spa_spares.sav_config) != 0) 2690 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2691 2692 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2693 spa_load_spares(spa); 2694 spa_config_exit(spa, SCL_ALL, FTAG); 2695 } else if (error == 0) { 2696 spa->spa_spares.sav_sync = B_TRUE; 2697 } 2698 2699 /* 2700 * Load any level 2 ARC devices for this pool. 2701 */ 2702 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 2703 &spa->spa_l2cache.sav_object); 2704 if (error != 0 && error != ENOENT) 2705 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2706 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2707 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 2708 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 2709 &spa->spa_l2cache.sav_config) != 0) 2710 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2711 2712 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2713 spa_load_l2cache(spa); 2714 spa_config_exit(spa, SCL_ALL, FTAG); 2715 } else if (error == 0) { 2716 spa->spa_l2cache.sav_sync = B_TRUE; 2717 } 2718 2719 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 2720 2721 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object); 2722 if (error && error != ENOENT) 2723 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2724 2725 if (error == 0) { 2726 uint64_t autoreplace; 2727 2728 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 2729 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 2730 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 2731 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 2732 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 2733 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 2734 &spa->spa_dedup_ditto); 2735 2736 spa->spa_autoreplace = (autoreplace != 0); 2737 } 2738 2739 /* 2740 * If the 'autoreplace' property is set, then post a resource notifying 2741 * the ZFS DE that it should not issue any faults for unopenable 2742 * devices. We also iterate over the vdevs, and post a sysevent for any 2743 * unopenable vdevs so that the normal autoreplace handler can take 2744 * over. 2745 */ 2746 if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) { 2747 spa_check_removed(spa->spa_root_vdev); 2748 /* 2749 * For the import case, this is done in spa_import(), because 2750 * at this point we're using the spare definitions from 2751 * the MOS config, not necessarily from the userland config. 2752 */ 2753 if (state != SPA_LOAD_IMPORT) { 2754 spa_aux_check_removed(&spa->spa_spares); 2755 spa_aux_check_removed(&spa->spa_l2cache); 2756 } 2757 } 2758 2759 /* 2760 * Load the vdev state for all toplevel vdevs. 2761 */ 2762 vdev_load(rvd); 2763 2764 /* 2765 * Propagate the leaf DTLs we just loaded all the way up the tree. 2766 */ 2767 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2768 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 2769 spa_config_exit(spa, SCL_ALL, FTAG); 2770 2771 /* 2772 * Load the DDTs (dedup tables). 2773 */ 2774 error = ddt_load(spa); 2775 if (error != 0) 2776 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2777 2778 spa_update_dspace(spa); 2779 2780 /* 2781 * Validate the config, using the MOS config to fill in any 2782 * information which might be missing. If we fail to validate 2783 * the config then declare the pool unfit for use. If we're 2784 * assembling a pool from a split, the log is not transferred 2785 * over. 2786 */ 2787 if (type != SPA_IMPORT_ASSEMBLE) { 2788 nvlist_t *nvconfig; 2789 2790 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2791 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2792 2793 if (!spa_config_valid(spa, nvconfig)) { 2794 nvlist_free(nvconfig); 2795 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2796 ENXIO)); 2797 } 2798 nvlist_free(nvconfig); 2799 2800 /* 2801 * Now that we've validated the config, check the state of the 2802 * root vdev. If it can't be opened, it indicates one or 2803 * more toplevel vdevs are faulted. 2804 */ 2805 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2806 return (SET_ERROR(ENXIO)); 2807 2808 if (spa_writeable(spa) && spa_check_logs(spa)) { 2809 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 2810 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO)); 2811 } 2812 } 2813 2814 if (missing_feat_write) { 2815 ASSERT(state == SPA_LOAD_TRYIMPORT); 2816 2817 /* 2818 * At this point, we know that we can open the pool in 2819 * read-only mode but not read-write mode. We now have enough 2820 * information and can return to userland. 2821 */ 2822 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, ENOTSUP)); 2823 } 2824 2825 /* 2826 * We've successfully opened the pool, verify that we're ready 2827 * to start pushing transactions. 2828 */ 2829 if (state != SPA_LOAD_TRYIMPORT) { 2830 if (error = spa_load_verify(spa)) 2831 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2832 error)); 2833 } 2834 2835 if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER || 2836 spa->spa_load_max_txg == UINT64_MAX)) { 2837 dmu_tx_t *tx; 2838 int need_update = B_FALSE; 2839 dsl_pool_t *dp = spa_get_dsl(spa); 2840 2841 ASSERT(state != SPA_LOAD_TRYIMPORT); 2842 2843 /* 2844 * Claim log blocks that haven't been committed yet. 2845 * This must all happen in a single txg. 2846 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 2847 * invoked from zil_claim_log_block()'s i/o done callback. 2848 * Price of rollback is that we abandon the log. 2849 */ 2850 spa->spa_claiming = B_TRUE; 2851 2852 tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); 2853 (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 2854 zil_claim, tx, DS_FIND_CHILDREN); 2855 dmu_tx_commit(tx); 2856 2857 spa->spa_claiming = B_FALSE; 2858 2859 spa_set_log_state(spa, SPA_LOG_GOOD); 2860 spa->spa_sync_on = B_TRUE; 2861 txg_sync_start(spa->spa_dsl_pool); 2862 2863 /* 2864 * Wait for all claims to sync. We sync up to the highest 2865 * claimed log block birth time so that claimed log blocks 2866 * don't appear to be from the future. spa_claim_max_txg 2867 * will have been set for us by either zil_check_log_chain() 2868 * (invoked from spa_check_logs()) or zil_claim() above. 2869 */ 2870 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 2871 2872 /* 2873 * If the config cache is stale, or we have uninitialized 2874 * metaslabs (see spa_vdev_add()), then update the config. 2875 * 2876 * If this is a verbatim import, trust the current 2877 * in-core spa_config and update the disk labels. 2878 */ 2879 if (config_cache_txg != spa->spa_config_txg || 2880 state == SPA_LOAD_IMPORT || 2881 state == SPA_LOAD_RECOVER || 2882 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 2883 need_update = B_TRUE; 2884 2885 for (int c = 0; c < rvd->vdev_children; c++) 2886 if (rvd->vdev_child[c]->vdev_ms_array == 0) 2887 need_update = B_TRUE; 2888 2889 /* 2890 * Update the config cache asychronously in case we're the 2891 * root pool, in which case the config cache isn't writable yet. 2892 */ 2893 if (need_update) 2894 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2895 2896 /* 2897 * Check all DTLs to see if anything needs resilvering. 2898 */ 2899 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 2900 vdev_resilver_needed(rvd, NULL, NULL)) 2901 spa_async_request(spa, SPA_ASYNC_RESILVER); 2902 2903 /* 2904 * Log the fact that we booted up (so that we can detect if 2905 * we rebooted in the middle of an operation). 2906 */ 2907 spa_history_log_version(spa, "open"); 2908 2909 /* 2910 * Delete any inconsistent datasets. 2911 */ 2912 (void) dmu_objset_find(spa_name(spa), 2913 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 2914 2915 /* 2916 * Clean up any stale temporary dataset userrefs. 2917 */ 2918 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 2919 } 2920 2921 return (0); 2922 } 2923 2924 static int 2925 spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig) 2926 { 2927 int mode = spa->spa_mode; 2928 2929 spa_unload(spa); 2930 spa_deactivate(spa); 2931 2932 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 2933 2934 spa_activate(spa, mode); 2935 spa_async_suspend(spa); 2936 2937 return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig)); 2938 } 2939 2940 /* 2941 * If spa_load() fails this function will try loading prior txg's. If 2942 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 2943 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 2944 * function will not rewind the pool and will return the same error as 2945 * spa_load(). 2946 */ 2947 static int 2948 spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig, 2949 uint64_t max_request, int rewind_flags) 2950 { 2951 nvlist_t *loadinfo = NULL; 2952 nvlist_t *config = NULL; 2953 int load_error, rewind_error; 2954 uint64_t safe_rewind_txg; 2955 uint64_t min_txg; 2956 2957 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 2958 spa->spa_load_max_txg = spa->spa_load_txg; 2959 spa_set_log_state(spa, SPA_LOG_CLEAR); 2960 } else { 2961 spa->spa_load_max_txg = max_request; 2962 if (max_request != UINT64_MAX) 2963 spa->spa_extreme_rewind = B_TRUE; 2964 } 2965 2966 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING, 2967 mosconfig); 2968 if (load_error == 0) 2969 return (0); 2970 2971 if (spa->spa_root_vdev != NULL) 2972 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 2973 2974 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 2975 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 2976 2977 if (rewind_flags & ZPOOL_NEVER_REWIND) { 2978 nvlist_free(config); 2979 return (load_error); 2980 } 2981 2982 if (state == SPA_LOAD_RECOVER) { 2983 /* Price of rolling back is discarding txgs, including log */ 2984 spa_set_log_state(spa, SPA_LOG_CLEAR); 2985 } else { 2986 /* 2987 * If we aren't rolling back save the load info from our first 2988 * import attempt so that we can restore it after attempting 2989 * to rewind. 2990 */ 2991 loadinfo = spa->spa_load_info; 2992 spa->spa_load_info = fnvlist_alloc(); 2993 } 2994 2995 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 2996 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 2997 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 2998 TXG_INITIAL : safe_rewind_txg; 2999 3000 /* 3001 * Continue as long as we're finding errors, we're still within 3002 * the acceptable rewind range, and we're still finding uberblocks 3003 */ 3004 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 3005 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 3006 if (spa->spa_load_max_txg < safe_rewind_txg) 3007 spa->spa_extreme_rewind = B_TRUE; 3008 rewind_error = spa_load_retry(spa, state, mosconfig); 3009 } 3010 3011 spa->spa_extreme_rewind = B_FALSE; 3012 spa->spa_load_max_txg = UINT64_MAX; 3013 3014 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 3015 spa_config_set(spa, config); 3016 3017 if (state == SPA_LOAD_RECOVER) { 3018 ASSERT3P(loadinfo, ==, NULL); 3019 return (rewind_error); 3020 } else { 3021 /* Store the rewind info as part of the initial load info */ 3022 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 3023 spa->spa_load_info); 3024 3025 /* Restore the initial load info */ 3026 fnvlist_free(spa->spa_load_info); 3027 spa->spa_load_info = loadinfo; 3028 3029 return (load_error); 3030 } 3031 } 3032 3033 /* 3034 * Pool Open/Import 3035 * 3036 * The import case is identical to an open except that the configuration is sent 3037 * down from userland, instead of grabbed from the configuration cache. For the 3038 * case of an open, the pool configuration will exist in the 3039 * POOL_STATE_UNINITIALIZED state. 3040 * 3041 * The stats information (gen/count/ustats) is used to gather vdev statistics at 3042 * the same time open the pool, without having to keep around the spa_t in some 3043 * ambiguous state. 3044 */ 3045 static int 3046 spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 3047 nvlist_t **config) 3048 { 3049 spa_t *spa; 3050 spa_load_state_t state = SPA_LOAD_OPEN; 3051 int error; 3052 int locked = B_FALSE; 3053 3054 *spapp = NULL; 3055 3056 /* 3057 * As disgusting as this is, we need to support recursive calls to this 3058 * function because dsl_dir_open() is called during spa_load(), and ends 3059 * up calling spa_open() again. The real fix is to figure out how to 3060 * avoid dsl_dir_open() calling this in the first place. 3061 */ 3062 if (mutex_owner(&spa_namespace_lock) != curthread) { 3063 mutex_enter(&spa_namespace_lock); 3064 locked = B_TRUE; 3065 } 3066 3067 if ((spa = spa_lookup(pool)) == NULL) { 3068 if (locked) 3069 mutex_exit(&spa_namespace_lock); 3070 return (SET_ERROR(ENOENT)); 3071 } 3072 3073 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 3074 zpool_rewind_policy_t policy; 3075 3076 zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config, 3077 &policy); 3078 if (policy.zrp_request & ZPOOL_DO_REWIND) 3079 state = SPA_LOAD_RECOVER; 3080 3081 spa_activate(spa, spa_mode_global); 3082 3083 if (state != SPA_LOAD_RECOVER) 3084 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 3085 3086 error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg, 3087 policy.zrp_request); 3088 3089 if (error == EBADF) { 3090 /* 3091 * If vdev_validate() returns failure (indicated by 3092 * EBADF), it indicates that one of the vdevs indicates 3093 * that the pool has been exported or destroyed. If 3094 * this is the case, the config cache is out of sync and 3095 * we should remove the pool from the namespace. 3096 */ 3097 spa_unload(spa); 3098 spa_deactivate(spa); 3099 spa_config_sync(spa, B_TRUE, B_TRUE); 3100 spa_remove(spa); 3101 if (locked) 3102 mutex_exit(&spa_namespace_lock); 3103 return (SET_ERROR(ENOENT)); 3104 } 3105 3106 if (error) { 3107 /* 3108 * We can't open the pool, but we still have useful 3109 * information: the state of each vdev after the 3110 * attempted vdev_open(). Return this to the user. 3111 */ 3112 if (config != NULL && spa->spa_config) { 3113 VERIFY(nvlist_dup(spa->spa_config, config, 3114 KM_SLEEP) == 0); 3115 VERIFY(nvlist_add_nvlist(*config, 3116 ZPOOL_CONFIG_LOAD_INFO, 3117 spa->spa_load_info) == 0); 3118 } 3119 spa_unload(spa); 3120 spa_deactivate(spa); 3121 spa->spa_last_open_failed = error; 3122 if (locked) 3123 mutex_exit(&spa_namespace_lock); 3124 *spapp = NULL; 3125 return (error); 3126 } 3127 } 3128 3129 spa_open_ref(spa, tag); 3130 3131 if (config != NULL) 3132 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 3133 3134 /* 3135 * If we've recovered the pool, pass back any information we 3136 * gathered while doing the load. 3137 */ 3138 if (state == SPA_LOAD_RECOVER) { 3139 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 3140 spa->spa_load_info) == 0); 3141 } 3142 3143 if (locked) { 3144 spa->spa_last_open_failed = 0; 3145 spa->spa_last_ubsync_txg = 0; 3146 spa->spa_load_txg = 0; 3147 mutex_exit(&spa_namespace_lock); 3148 } 3149 3150 *spapp = spa; 3151 3152 return (0); 3153 } 3154 3155 int 3156 spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 3157 nvlist_t **config) 3158 { 3159 return (spa_open_common(name, spapp, tag, policy, config)); 3160 } 3161 3162 int 3163 spa_open(const char *name, spa_t **spapp, void *tag) 3164 { 3165 return (spa_open_common(name, spapp, tag, NULL, NULL)); 3166 } 3167 3168 /* 3169 * Lookup the given spa_t, incrementing the inject count in the process, 3170 * preventing it from being exported or destroyed. 3171 */ 3172 spa_t * 3173 spa_inject_addref(char *name) 3174 { 3175 spa_t *spa; 3176 3177 mutex_enter(&spa_namespace_lock); 3178 if ((spa = spa_lookup(name)) == NULL) { 3179 mutex_exit(&spa_namespace_lock); 3180 return (NULL); 3181 } 3182 spa->spa_inject_ref++; 3183 mutex_exit(&spa_namespace_lock); 3184 3185 return (spa); 3186 } 3187 3188 void 3189 spa_inject_delref(spa_t *spa) 3190 { 3191 mutex_enter(&spa_namespace_lock); 3192 spa->spa_inject_ref--; 3193 mutex_exit(&spa_namespace_lock); 3194 } 3195 3196 /* 3197 * Add spares device information to the nvlist. 3198 */ 3199 static void 3200 spa_add_spares(spa_t *spa, nvlist_t *config) 3201 { 3202 nvlist_t **spares; 3203 uint_t i, nspares; 3204 nvlist_t *nvroot; 3205 uint64_t guid; 3206 vdev_stat_t *vs; 3207 uint_t vsc; 3208 uint64_t pool; 3209 3210 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3211 3212 if (spa->spa_spares.sav_count == 0) 3213 return; 3214 3215 VERIFY(nvlist_lookup_nvlist(config, 3216 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3217 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 3218 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3219 if (nspares != 0) { 3220 VERIFY(nvlist_add_nvlist_array(nvroot, 3221 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3222 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3223 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3224 3225 /* 3226 * Go through and find any spares which have since been 3227 * repurposed as an active spare. If this is the case, update 3228 * their status appropriately. 3229 */ 3230 for (i = 0; i < nspares; i++) { 3231 VERIFY(nvlist_lookup_uint64(spares[i], 3232 ZPOOL_CONFIG_GUID, &guid) == 0); 3233 if (spa_spare_exists(guid, &pool, NULL) && 3234 pool != 0ULL) { 3235 VERIFY(nvlist_lookup_uint64_array( 3236 spares[i], ZPOOL_CONFIG_VDEV_STATS, 3237 (uint64_t **)&vs, &vsc) == 0); 3238 vs->vs_state = VDEV_STATE_CANT_OPEN; 3239 vs->vs_aux = VDEV_AUX_SPARED; 3240 } 3241 } 3242 } 3243 } 3244 3245 /* 3246 * Add l2cache device information to the nvlist, including vdev stats. 3247 */ 3248 static void 3249 spa_add_l2cache(spa_t *spa, nvlist_t *config) 3250 { 3251 nvlist_t **l2cache; 3252 uint_t i, j, nl2cache; 3253 nvlist_t *nvroot; 3254 uint64_t guid; 3255 vdev_t *vd; 3256 vdev_stat_t *vs; 3257 uint_t vsc; 3258 3259 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3260 3261 if (spa->spa_l2cache.sav_count == 0) 3262 return; 3263 3264 VERIFY(nvlist_lookup_nvlist(config, 3265 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3266 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 3267 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3268 if (nl2cache != 0) { 3269 VERIFY(nvlist_add_nvlist_array(nvroot, 3270 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3271 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3272 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3273 3274 /* 3275 * Update level 2 cache device stats. 3276 */ 3277 3278 for (i = 0; i < nl2cache; i++) { 3279 VERIFY(nvlist_lookup_uint64(l2cache[i], 3280 ZPOOL_CONFIG_GUID, &guid) == 0); 3281 3282 vd = NULL; 3283 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 3284 if (guid == 3285 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 3286 vd = spa->spa_l2cache.sav_vdevs[j]; 3287 break; 3288 } 3289 } 3290 ASSERT(vd != NULL); 3291 3292 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 3293 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 3294 == 0); 3295 vdev_get_stats(vd, vs); 3296 } 3297 } 3298 } 3299 3300 static void 3301 spa_add_feature_stats(spa_t *spa, nvlist_t *config) 3302 { 3303 nvlist_t *features; 3304 zap_cursor_t zc; 3305 zap_attribute_t za; 3306 3307 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3308 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3309 3310 if (spa->spa_feat_for_read_obj != 0) { 3311 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3312 spa->spa_feat_for_read_obj); 3313 zap_cursor_retrieve(&zc, &za) == 0; 3314 zap_cursor_advance(&zc)) { 3315 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3316 za.za_num_integers == 1); 3317 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3318 za.za_first_integer)); 3319 } 3320 zap_cursor_fini(&zc); 3321 } 3322 3323 if (spa->spa_feat_for_write_obj != 0) { 3324 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3325 spa->spa_feat_for_write_obj); 3326 zap_cursor_retrieve(&zc, &za) == 0; 3327 zap_cursor_advance(&zc)) { 3328 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3329 za.za_num_integers == 1); 3330 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3331 za.za_first_integer)); 3332 } 3333 zap_cursor_fini(&zc); 3334 } 3335 3336 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 3337 features) == 0); 3338 nvlist_free(features); 3339 } 3340 3341 int 3342 spa_get_stats(const char *name, nvlist_t **config, 3343 char *altroot, size_t buflen) 3344 { 3345 int error; 3346 spa_t *spa; 3347 3348 *config = NULL; 3349 error = spa_open_common(name, &spa, FTAG, NULL, config); 3350 3351 if (spa != NULL) { 3352 /* 3353 * This still leaves a window of inconsistency where the spares 3354 * or l2cache devices could change and the config would be 3355 * self-inconsistent. 3356 */ 3357 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 3358 3359 if (*config != NULL) { 3360 uint64_t loadtimes[2]; 3361 3362 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 3363 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 3364 VERIFY(nvlist_add_uint64_array(*config, 3365 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 3366 3367 VERIFY(nvlist_add_uint64(*config, 3368 ZPOOL_CONFIG_ERRCOUNT, 3369 spa_get_errlog_size(spa)) == 0); 3370 3371 if (spa_suspended(spa)) 3372 VERIFY(nvlist_add_uint64(*config, 3373 ZPOOL_CONFIG_SUSPENDED, 3374 spa->spa_failmode) == 0); 3375 3376 spa_add_spares(spa, *config); 3377 spa_add_l2cache(spa, *config); 3378 spa_add_feature_stats(spa, *config); 3379 } 3380 } 3381 3382 /* 3383 * We want to get the alternate root even for faulted pools, so we cheat 3384 * and call spa_lookup() directly. 3385 */ 3386 if (altroot) { 3387 if (spa == NULL) { 3388 mutex_enter(&spa_namespace_lock); 3389 spa = spa_lookup(name); 3390 if (spa) 3391 spa_altroot(spa, altroot, buflen); 3392 else 3393 altroot[0] = '\0'; 3394 spa = NULL; 3395 mutex_exit(&spa_namespace_lock); 3396 } else { 3397 spa_altroot(spa, altroot, buflen); 3398 } 3399 } 3400 3401 if (spa != NULL) { 3402 spa_config_exit(spa, SCL_CONFIG, FTAG); 3403 spa_close(spa, FTAG); 3404 } 3405 3406 return (error); 3407 } 3408 3409 /* 3410 * Validate that the auxiliary device array is well formed. We must have an 3411 * array of nvlists, each which describes a valid leaf vdev. If this is an 3412 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 3413 * specified, as long as they are well-formed. 3414 */ 3415 static int 3416 spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 3417 spa_aux_vdev_t *sav, const char *config, uint64_t version, 3418 vdev_labeltype_t label) 3419 { 3420 nvlist_t **dev; 3421 uint_t i, ndev; 3422 vdev_t *vd; 3423 int error; 3424 3425 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3426 3427 /* 3428 * It's acceptable to have no devs specified. 3429 */ 3430 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 3431 return (0); 3432 3433 if (ndev == 0) 3434 return (SET_ERROR(EINVAL)); 3435 3436 /* 3437 * Make sure the pool is formatted with a version that supports this 3438 * device type. 3439 */ 3440 if (spa_version(spa) < version) 3441 return (SET_ERROR(ENOTSUP)); 3442 3443 /* 3444 * Set the pending device list so we correctly handle device in-use 3445 * checking. 3446 */ 3447 sav->sav_pending = dev; 3448 sav->sav_npending = ndev; 3449 3450 for (i = 0; i < ndev; i++) { 3451 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 3452 mode)) != 0) 3453 goto out; 3454 3455 if (!vd->vdev_ops->vdev_op_leaf) { 3456 vdev_free(vd); 3457 error = SET_ERROR(EINVAL); 3458 goto out; 3459 } 3460 3461 /* 3462 * The L2ARC currently only supports disk devices in 3463 * kernel context. For user-level testing, we allow it. 3464 */ 3465 #ifdef _KERNEL 3466 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 3467 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 3468 error = SET_ERROR(ENOTBLK); 3469 vdev_free(vd); 3470 goto out; 3471 } 3472 #endif 3473 vd->vdev_top = vd; 3474 3475 if ((error = vdev_open(vd)) == 0 && 3476 (error = vdev_label_init(vd, crtxg, label)) == 0) { 3477 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 3478 vd->vdev_guid) == 0); 3479 } 3480 3481 vdev_free(vd); 3482 3483 if (error && 3484 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 3485 goto out; 3486 else 3487 error = 0; 3488 } 3489 3490 out: 3491 sav->sav_pending = NULL; 3492 sav->sav_npending = 0; 3493 return (error); 3494 } 3495 3496 static int 3497 spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 3498 { 3499 int error; 3500 3501 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3502 3503 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3504 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 3505 VDEV_LABEL_SPARE)) != 0) { 3506 return (error); 3507 } 3508 3509 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3510 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 3511 VDEV_LABEL_L2CACHE)); 3512 } 3513 3514 static void 3515 spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 3516 const char *config) 3517 { 3518 int i; 3519 3520 if (sav->sav_config != NULL) { 3521 nvlist_t **olddevs; 3522 uint_t oldndevs; 3523 nvlist_t **newdevs; 3524 3525 /* 3526 * Generate new dev list by concatentating with the 3527 * current dev list. 3528 */ 3529 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 3530 &olddevs, &oldndevs) == 0); 3531 3532 newdevs = kmem_alloc(sizeof (void *) * 3533 (ndevs + oldndevs), KM_SLEEP); 3534 for (i = 0; i < oldndevs; i++) 3535 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 3536 KM_SLEEP) == 0); 3537 for (i = 0; i < ndevs; i++) 3538 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 3539 KM_SLEEP) == 0); 3540 3541 VERIFY(nvlist_remove(sav->sav_config, config, 3542 DATA_TYPE_NVLIST_ARRAY) == 0); 3543 3544 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 3545 config, newdevs, ndevs + oldndevs) == 0); 3546 for (i = 0; i < oldndevs + ndevs; i++) 3547 nvlist_free(newdevs[i]); 3548 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 3549 } else { 3550 /* 3551 * Generate a new dev list. 3552 */ 3553 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 3554 KM_SLEEP) == 0); 3555 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 3556 devs, ndevs) == 0); 3557 } 3558 } 3559 3560 /* 3561 * Stop and drop level 2 ARC devices 3562 */ 3563 void 3564 spa_l2cache_drop(spa_t *spa) 3565 { 3566 vdev_t *vd; 3567 int i; 3568 spa_aux_vdev_t *sav = &spa->spa_l2cache; 3569 3570 for (i = 0; i < sav->sav_count; i++) { 3571 uint64_t pool; 3572 3573 vd = sav->sav_vdevs[i]; 3574 ASSERT(vd != NULL); 3575 3576 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 3577 pool != 0ULL && l2arc_vdev_present(vd)) 3578 l2arc_remove_vdev(vd); 3579 } 3580 } 3581 3582 /* 3583 * Pool Creation 3584 */ 3585 int 3586 spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 3587 nvlist_t *zplprops) 3588 { 3589 spa_t *spa; 3590 char *altroot = NULL; 3591 vdev_t *rvd; 3592 dsl_pool_t *dp; 3593 dmu_tx_t *tx; 3594 int error = 0; 3595 uint64_t txg = TXG_INITIAL; 3596 nvlist_t **spares, **l2cache; 3597 uint_t nspares, nl2cache; 3598 uint64_t version, obj; 3599 boolean_t has_features; 3600 3601 /* 3602 * If this pool already exists, return failure. 3603 */ 3604 mutex_enter(&spa_namespace_lock); 3605 if (spa_lookup(pool) != NULL) { 3606 mutex_exit(&spa_namespace_lock); 3607 return (SET_ERROR(EEXIST)); 3608 } 3609 3610 /* 3611 * Allocate a new spa_t structure. 3612 */ 3613 (void) nvlist_lookup_string(props, 3614 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 3615 spa = spa_add(pool, NULL, altroot); 3616 spa_activate(spa, spa_mode_global); 3617 3618 if (props && (error = spa_prop_validate(spa, props))) { 3619 spa_deactivate(spa); 3620 spa_remove(spa); 3621 mutex_exit(&spa_namespace_lock); 3622 return (error); 3623 } 3624 3625 has_features = B_FALSE; 3626 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 3627 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 3628 if (zpool_prop_feature(nvpair_name(elem))) 3629 has_features = B_TRUE; 3630 } 3631 3632 if (has_features || nvlist_lookup_uint64(props, 3633 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 3634 version = SPA_VERSION; 3635 } 3636 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 3637 3638 spa->spa_first_txg = txg; 3639 spa->spa_uberblock.ub_txg = txg - 1; 3640 spa->spa_uberblock.ub_version = version; 3641 spa->spa_ubsync = spa->spa_uberblock; 3642 3643 /* 3644 * Create "The Godfather" zio to hold all async IOs 3645 */ 3646 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 3647 KM_SLEEP); 3648 for (int i = 0; i < max_ncpus; i++) { 3649 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 3650 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 3651 ZIO_FLAG_GODFATHER); 3652 } 3653 3654 /* 3655 * Create the root vdev. 3656 */ 3657 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3658 3659 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 3660 3661 ASSERT(error != 0 || rvd != NULL); 3662 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 3663 3664 if (error == 0 && !zfs_allocatable_devs(nvroot)) 3665 error = SET_ERROR(EINVAL); 3666 3667 if (error == 0 && 3668 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 3669 (error = spa_validate_aux(spa, nvroot, txg, 3670 VDEV_ALLOC_ADD)) == 0) { 3671 for (int c = 0; c < rvd->vdev_children; c++) { 3672 vdev_metaslab_set_size(rvd->vdev_child[c]); 3673 vdev_expand(rvd->vdev_child[c], txg); 3674 } 3675 } 3676 3677 spa_config_exit(spa, SCL_ALL, FTAG); 3678 3679 if (error != 0) { 3680 spa_unload(spa); 3681 spa_deactivate(spa); 3682 spa_remove(spa); 3683 mutex_exit(&spa_namespace_lock); 3684 return (error); 3685 } 3686 3687 /* 3688 * Get the list of spares, if specified. 3689 */ 3690 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 3691 &spares, &nspares) == 0) { 3692 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 3693 KM_SLEEP) == 0); 3694 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 3695 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3696 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3697 spa_load_spares(spa); 3698 spa_config_exit(spa, SCL_ALL, FTAG); 3699 spa->spa_spares.sav_sync = B_TRUE; 3700 } 3701 3702 /* 3703 * Get the list of level 2 cache devices, if specified. 3704 */ 3705 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 3706 &l2cache, &nl2cache) == 0) { 3707 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 3708 NV_UNIQUE_NAME, KM_SLEEP) == 0); 3709 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 3710 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3711 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3712 spa_load_l2cache(spa); 3713 spa_config_exit(spa, SCL_ALL, FTAG); 3714 spa->spa_l2cache.sav_sync = B_TRUE; 3715 } 3716 3717 spa->spa_is_initializing = B_TRUE; 3718 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 3719 spa->spa_meta_objset = dp->dp_meta_objset; 3720 spa->spa_is_initializing = B_FALSE; 3721 3722 /* 3723 * Create DDTs (dedup tables). 3724 */ 3725 ddt_create(spa); 3726 3727 spa_update_dspace(spa); 3728 3729 tx = dmu_tx_create_assigned(dp, txg); 3730 3731 /* 3732 * Create the pool config object. 3733 */ 3734 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 3735 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 3736 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 3737 3738 if (zap_add(spa->spa_meta_objset, 3739 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 3740 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 3741 cmn_err(CE_PANIC, "failed to add pool config"); 3742 } 3743 3744 if (spa_version(spa) >= SPA_VERSION_FEATURES) 3745 spa_feature_create_zap_objects(spa, tx); 3746 3747 if (zap_add(spa->spa_meta_objset, 3748 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 3749 sizeof (uint64_t), 1, &version, tx) != 0) { 3750 cmn_err(CE_PANIC, "failed to add pool version"); 3751 } 3752 3753 /* Newly created pools with the right version are always deflated. */ 3754 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 3755 spa->spa_deflate = TRUE; 3756 if (zap_add(spa->spa_meta_objset, 3757 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 3758 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 3759 cmn_err(CE_PANIC, "failed to add deflate"); 3760 } 3761 } 3762 3763 /* 3764 * Create the deferred-free bpobj. Turn off compression 3765 * because sync-to-convergence takes longer if the blocksize 3766 * keeps changing. 3767 */ 3768 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 3769 dmu_object_set_compress(spa->spa_meta_objset, obj, 3770 ZIO_COMPRESS_OFF, tx); 3771 if (zap_add(spa->spa_meta_objset, 3772 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 3773 sizeof (uint64_t), 1, &obj, tx) != 0) { 3774 cmn_err(CE_PANIC, "failed to add bpobj"); 3775 } 3776 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 3777 spa->spa_meta_objset, obj)); 3778 3779 /* 3780 * Create the pool's history object. 3781 */ 3782 if (version >= SPA_VERSION_ZPOOL_HISTORY) 3783 spa_history_create_obj(spa, tx); 3784 3785 /* 3786 * Generate some random noise for salted checksums to operate on. 3787 */ 3788 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 3789 sizeof (spa->spa_cksum_salt.zcs_bytes)); 3790 3791 /* 3792 * Set pool properties. 3793 */ 3794 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 3795 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3796 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 3797 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 3798 3799 if (props != NULL) { 3800 spa_configfile_set(spa, props, B_FALSE); 3801 spa_sync_props(props, tx); 3802 } 3803 3804 dmu_tx_commit(tx); 3805 3806 spa->spa_sync_on = B_TRUE; 3807 txg_sync_start(spa->spa_dsl_pool); 3808 3809 /* 3810 * We explicitly wait for the first transaction to complete so that our 3811 * bean counters are appropriately updated. 3812 */ 3813 txg_wait_synced(spa->spa_dsl_pool, txg); 3814 3815 spa_config_sync(spa, B_FALSE, B_TRUE); 3816 spa_event_notify(spa, NULL, ESC_ZFS_POOL_CREATE); 3817 3818 spa_history_log_version(spa, "create"); 3819 3820 /* 3821 * Don't count references from objsets that are already closed 3822 * and are making their way through the eviction process. 3823 */ 3824 spa_evicting_os_wait(spa); 3825 spa->spa_minref = refcount_count(&spa->spa_refcount); 3826 3827 mutex_exit(&spa_namespace_lock); 3828 3829 return (0); 3830 } 3831 3832 #ifdef _KERNEL 3833 /* 3834 * Get the root pool information from the root disk, then import the root pool 3835 * during the system boot up time. 3836 */ 3837 extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 3838 3839 static nvlist_t * 3840 spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 3841 { 3842 nvlist_t *config; 3843 nvlist_t *nvtop, *nvroot; 3844 uint64_t pgid; 3845 3846 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 3847 return (NULL); 3848 3849 /* 3850 * Add this top-level vdev to the child array. 3851 */ 3852 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3853 &nvtop) == 0); 3854 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 3855 &pgid) == 0); 3856 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 3857 3858 /* 3859 * Put this pool's top-level vdevs into a root vdev. 3860 */ 3861 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3862 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 3863 VDEV_TYPE_ROOT) == 0); 3864 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 3865 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 3866 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 3867 &nvtop, 1) == 0); 3868 3869 /* 3870 * Replace the existing vdev_tree with the new root vdev in 3871 * this pool's configuration (remove the old, add the new). 3872 */ 3873 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 3874 nvlist_free(nvroot); 3875 return (config); 3876 } 3877 3878 /* 3879 * Walk the vdev tree and see if we can find a device with "better" 3880 * configuration. A configuration is "better" if the label on that 3881 * device has a more recent txg. 3882 */ 3883 static void 3884 spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 3885 { 3886 for (int c = 0; c < vd->vdev_children; c++) 3887 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 3888 3889 if (vd->vdev_ops->vdev_op_leaf) { 3890 nvlist_t *label; 3891 uint64_t label_txg; 3892 3893 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 3894 &label) != 0) 3895 return; 3896 3897 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 3898 &label_txg) == 0); 3899 3900 /* 3901 * Do we have a better boot device? 3902 */ 3903 if (label_txg > *txg) { 3904 *txg = label_txg; 3905 *avd = vd; 3906 } 3907 nvlist_free(label); 3908 } 3909 } 3910 3911 /* 3912 * Import a root pool. 3913 * 3914 * For x86. devpath_list will consist of devid and/or physpath name of 3915 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 3916 * The GRUB "findroot" command will return the vdev we should boot. 3917 * 3918 * For Sparc, devpath_list consists the physpath name of the booting device 3919 * no matter the rootpool is a single device pool or a mirrored pool. 3920 * e.g. 3921 * "/pci@1f,0/ide@d/disk@0,0:a" 3922 */ 3923 int 3924 spa_import_rootpool(char *devpath, char *devid) 3925 { 3926 spa_t *spa; 3927 vdev_t *rvd, *bvd, *avd = NULL; 3928 nvlist_t *config, *nvtop; 3929 uint64_t guid, txg; 3930 char *pname; 3931 int error; 3932 3933 /* 3934 * Read the label from the boot device and generate a configuration. 3935 */ 3936 config = spa_generate_rootconf(devpath, devid, &guid); 3937 #if defined(_OBP) && defined(_KERNEL) 3938 if (config == NULL) { 3939 if (strstr(devpath, "/iscsi/ssd") != NULL) { 3940 /* iscsi boot */ 3941 get_iscsi_bootpath_phy(devpath); 3942 config = spa_generate_rootconf(devpath, devid, &guid); 3943 } 3944 } 3945 #endif 3946 if (config == NULL) { 3947 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 3948 devpath); 3949 return (SET_ERROR(EIO)); 3950 } 3951 3952 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 3953 &pname) == 0); 3954 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 3955 3956 mutex_enter(&spa_namespace_lock); 3957 if ((spa = spa_lookup(pname)) != NULL) { 3958 /* 3959 * Remove the existing root pool from the namespace so that we 3960 * can replace it with the correct config we just read in. 3961 */ 3962 spa_remove(spa); 3963 } 3964 3965 spa = spa_add(pname, config, NULL); 3966 spa->spa_is_root = B_TRUE; 3967 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 3968 3969 /* 3970 * Build up a vdev tree based on the boot device's label config. 3971 */ 3972 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3973 &nvtop) == 0); 3974 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3975 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 3976 VDEV_ALLOC_ROOTPOOL); 3977 spa_config_exit(spa, SCL_ALL, FTAG); 3978 if (error) { 3979 mutex_exit(&spa_namespace_lock); 3980 nvlist_free(config); 3981 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 3982 pname); 3983 return (error); 3984 } 3985 3986 /* 3987 * Get the boot vdev. 3988 */ 3989 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 3990 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 3991 (u_longlong_t)guid); 3992 error = SET_ERROR(ENOENT); 3993 goto out; 3994 } 3995 3996 /* 3997 * Determine if there is a better boot device. 3998 */ 3999 avd = bvd; 4000 spa_alt_rootvdev(rvd, &avd, &txg); 4001 if (avd != bvd) { 4002 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 4003 "try booting from '%s'", avd->vdev_path); 4004 error = SET_ERROR(EINVAL); 4005 goto out; 4006 } 4007 4008 /* 4009 * If the boot device is part of a spare vdev then ensure that 4010 * we're booting off the active spare. 4011 */ 4012 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 4013 !bvd->vdev_isspare) { 4014 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 4015 "try booting from '%s'", 4016 bvd->vdev_parent-> 4017 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 4018 error = SET_ERROR(EINVAL); 4019 goto out; 4020 } 4021 4022 error = 0; 4023 out: 4024 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4025 vdev_free(rvd); 4026 spa_config_exit(spa, SCL_ALL, FTAG); 4027 mutex_exit(&spa_namespace_lock); 4028 4029 nvlist_free(config); 4030 return (error); 4031 } 4032 4033 #endif 4034 4035 /* 4036 * Import a non-root pool into the system. 4037 */ 4038 int 4039 spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 4040 { 4041 spa_t *spa; 4042 char *altroot = NULL; 4043 spa_load_state_t state = SPA_LOAD_IMPORT; 4044 zpool_rewind_policy_t policy; 4045 uint64_t mode = spa_mode_global; 4046 uint64_t readonly = B_FALSE; 4047 int error; 4048 nvlist_t *nvroot; 4049 nvlist_t **spares, **l2cache; 4050 uint_t nspares, nl2cache; 4051 4052 /* 4053 * If a pool with this name exists, return failure. 4054 */ 4055 mutex_enter(&spa_namespace_lock); 4056 if (spa_lookup(pool) != NULL) { 4057 mutex_exit(&spa_namespace_lock); 4058 return (SET_ERROR(EEXIST)); 4059 } 4060 4061 /* 4062 * Create and initialize the spa structure. 4063 */ 4064 (void) nvlist_lookup_string(props, 4065 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4066 (void) nvlist_lookup_uint64(props, 4067 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 4068 if (readonly) 4069 mode = FREAD; 4070 spa = spa_add(pool, config, altroot); 4071 spa->spa_import_flags = flags; 4072 4073 /* 4074 * Verbatim import - Take a pool and insert it into the namespace 4075 * as if it had been loaded at boot. 4076 */ 4077 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 4078 if (props != NULL) 4079 spa_configfile_set(spa, props, B_FALSE); 4080 4081 spa_config_sync(spa, B_FALSE, B_TRUE); 4082 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4083 4084 mutex_exit(&spa_namespace_lock); 4085 return (0); 4086 } 4087 4088 spa_activate(spa, mode); 4089 4090 /* 4091 * Don't start async tasks until we know everything is healthy. 4092 */ 4093 spa_async_suspend(spa); 4094 4095 zpool_get_rewind_policy(config, &policy); 4096 if (policy.zrp_request & ZPOOL_DO_REWIND) 4097 state = SPA_LOAD_RECOVER; 4098 4099 /* 4100 * Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig 4101 * because the user-supplied config is actually the one to trust when 4102 * doing an import. 4103 */ 4104 if (state != SPA_LOAD_RECOVER) 4105 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4106 4107 error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg, 4108 policy.zrp_request); 4109 4110 /* 4111 * Propagate anything learned while loading the pool and pass it 4112 * back to caller (i.e. rewind info, missing devices, etc). 4113 */ 4114 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4115 spa->spa_load_info) == 0); 4116 4117 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4118 /* 4119 * Toss any existing sparelist, as it doesn't have any validity 4120 * anymore, and conflicts with spa_has_spare(). 4121 */ 4122 if (spa->spa_spares.sav_config) { 4123 nvlist_free(spa->spa_spares.sav_config); 4124 spa->spa_spares.sav_config = NULL; 4125 spa_load_spares(spa); 4126 } 4127 if (spa->spa_l2cache.sav_config) { 4128 nvlist_free(spa->spa_l2cache.sav_config); 4129 spa->spa_l2cache.sav_config = NULL; 4130 spa_load_l2cache(spa); 4131 } 4132 4133 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4134 &nvroot) == 0); 4135 if (error == 0) 4136 error = spa_validate_aux(spa, nvroot, -1ULL, 4137 VDEV_ALLOC_SPARE); 4138 if (error == 0) 4139 error = spa_validate_aux(spa, nvroot, -1ULL, 4140 VDEV_ALLOC_L2CACHE); 4141 spa_config_exit(spa, SCL_ALL, FTAG); 4142 4143 if (props != NULL) 4144 spa_configfile_set(spa, props, B_FALSE); 4145 4146 if (error != 0 || (props && spa_writeable(spa) && 4147 (error = spa_prop_set(spa, props)))) { 4148 spa_unload(spa); 4149 spa_deactivate(spa); 4150 spa_remove(spa); 4151 mutex_exit(&spa_namespace_lock); 4152 return (error); 4153 } 4154 4155 spa_async_resume(spa); 4156 4157 /* 4158 * Override any spares and level 2 cache devices as specified by 4159 * the user, as these may have correct device names/devids, etc. 4160 */ 4161 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4162 &spares, &nspares) == 0) { 4163 if (spa->spa_spares.sav_config) 4164 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 4165 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 4166 else 4167 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 4168 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4169 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4170 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4171 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4172 spa_load_spares(spa); 4173 spa_config_exit(spa, SCL_ALL, FTAG); 4174 spa->spa_spares.sav_sync = B_TRUE; 4175 } 4176 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4177 &l2cache, &nl2cache) == 0) { 4178 if (spa->spa_l2cache.sav_config) 4179 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 4180 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 4181 else 4182 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4183 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4184 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4185 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4186 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4187 spa_load_l2cache(spa); 4188 spa_config_exit(spa, SCL_ALL, FTAG); 4189 spa->spa_l2cache.sav_sync = B_TRUE; 4190 } 4191 4192 /* 4193 * Check for any removed devices. 4194 */ 4195 if (spa->spa_autoreplace) { 4196 spa_aux_check_removed(&spa->spa_spares); 4197 spa_aux_check_removed(&spa->spa_l2cache); 4198 } 4199 4200 if (spa_writeable(spa)) { 4201 /* 4202 * Update the config cache to include the newly-imported pool. 4203 */ 4204 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4205 } 4206 4207 /* 4208 * It's possible that the pool was expanded while it was exported. 4209 * We kick off an async task to handle this for us. 4210 */ 4211 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 4212 4213 spa_history_log_version(spa, "import"); 4214 4215 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4216 4217 mutex_exit(&spa_namespace_lock); 4218 4219 return (0); 4220 } 4221 4222 nvlist_t * 4223 spa_tryimport(nvlist_t *tryconfig) 4224 { 4225 nvlist_t *config = NULL; 4226 char *poolname; 4227 spa_t *spa; 4228 uint64_t state; 4229 int error; 4230 4231 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 4232 return (NULL); 4233 4234 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 4235 return (NULL); 4236 4237 /* 4238 * Create and initialize the spa structure. 4239 */ 4240 mutex_enter(&spa_namespace_lock); 4241 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 4242 spa_activate(spa, FREAD); 4243 4244 /* 4245 * Pass off the heavy lifting to spa_load(). 4246 * Pass TRUE for mosconfig because the user-supplied config 4247 * is actually the one to trust when doing an import. 4248 */ 4249 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE); 4250 4251 /* 4252 * If 'tryconfig' was at least parsable, return the current config. 4253 */ 4254 if (spa->spa_root_vdev != NULL) { 4255 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4256 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 4257 poolname) == 0); 4258 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 4259 state) == 0); 4260 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 4261 spa->spa_uberblock.ub_timestamp) == 0); 4262 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4263 spa->spa_load_info) == 0); 4264 4265 /* 4266 * If the bootfs property exists on this pool then we 4267 * copy it out so that external consumers can tell which 4268 * pools are bootable. 4269 */ 4270 if ((!error || error == EEXIST) && spa->spa_bootfs) { 4271 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4272 4273 /* 4274 * We have to play games with the name since the 4275 * pool was opened as TRYIMPORT_NAME. 4276 */ 4277 if (dsl_dsobj_to_dsname(spa_name(spa), 4278 spa->spa_bootfs, tmpname) == 0) { 4279 char *cp; 4280 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4281 4282 cp = strchr(tmpname, '/'); 4283 if (cp == NULL) { 4284 (void) strlcpy(dsname, tmpname, 4285 MAXPATHLEN); 4286 } else { 4287 (void) snprintf(dsname, MAXPATHLEN, 4288 "%s/%s", poolname, ++cp); 4289 } 4290 VERIFY(nvlist_add_string(config, 4291 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 4292 kmem_free(dsname, MAXPATHLEN); 4293 } 4294 kmem_free(tmpname, MAXPATHLEN); 4295 } 4296 4297 /* 4298 * Add the list of hot spares and level 2 cache devices. 4299 */ 4300 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4301 spa_add_spares(spa, config); 4302 spa_add_l2cache(spa, config); 4303 spa_config_exit(spa, SCL_CONFIG, FTAG); 4304 } 4305 4306 spa_unload(spa); 4307 spa_deactivate(spa); 4308 spa_remove(spa); 4309 mutex_exit(&spa_namespace_lock); 4310 4311 return (config); 4312 } 4313 4314 /* 4315 * Pool export/destroy 4316 * 4317 * The act of destroying or exporting a pool is very simple. We make sure there 4318 * is no more pending I/O and any references to the pool are gone. Then, we 4319 * update the pool state and sync all the labels to disk, removing the 4320 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 4321 * we don't sync the labels or remove the configuration cache. 4322 */ 4323 static int 4324 spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 4325 boolean_t force, boolean_t hardforce) 4326 { 4327 spa_t *spa; 4328 4329 if (oldconfig) 4330 *oldconfig = NULL; 4331 4332 if (!(spa_mode_global & FWRITE)) 4333 return (SET_ERROR(EROFS)); 4334 4335 mutex_enter(&spa_namespace_lock); 4336 if ((spa = spa_lookup(pool)) == NULL) { 4337 mutex_exit(&spa_namespace_lock); 4338 return (SET_ERROR(ENOENT)); 4339 } 4340 4341 /* 4342 * Put a hold on the pool, drop the namespace lock, stop async tasks, 4343 * reacquire the namespace lock, and see if we can export. 4344 */ 4345 spa_open_ref(spa, FTAG); 4346 mutex_exit(&spa_namespace_lock); 4347 spa_async_suspend(spa); 4348 mutex_enter(&spa_namespace_lock); 4349 spa_close(spa, FTAG); 4350 4351 /* 4352 * The pool will be in core if it's openable, 4353 * in which case we can modify its state. 4354 */ 4355 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 4356 /* 4357 * Objsets may be open only because they're dirty, so we 4358 * have to force it to sync before checking spa_refcnt. 4359 */ 4360 txg_wait_synced(spa->spa_dsl_pool, 0); 4361 spa_evicting_os_wait(spa); 4362 4363 /* 4364 * A pool cannot be exported or destroyed if there are active 4365 * references. If we are resetting a pool, allow references by 4366 * fault injection handlers. 4367 */ 4368 if (!spa_refcount_zero(spa) || 4369 (spa->spa_inject_ref != 0 && 4370 new_state != POOL_STATE_UNINITIALIZED)) { 4371 spa_async_resume(spa); 4372 mutex_exit(&spa_namespace_lock); 4373 return (SET_ERROR(EBUSY)); 4374 } 4375 4376 /* 4377 * A pool cannot be exported if it has an active shared spare. 4378 * This is to prevent other pools stealing the active spare 4379 * from an exported pool. At user's own will, such pool can 4380 * be forcedly exported. 4381 */ 4382 if (!force && new_state == POOL_STATE_EXPORTED && 4383 spa_has_active_shared_spare(spa)) { 4384 spa_async_resume(spa); 4385 mutex_exit(&spa_namespace_lock); 4386 return (SET_ERROR(EXDEV)); 4387 } 4388 4389 /* 4390 * We want this to be reflected on every label, 4391 * so mark them all dirty. spa_unload() will do the 4392 * final sync that pushes these changes out. 4393 */ 4394 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 4395 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4396 spa->spa_state = new_state; 4397 spa->spa_final_txg = spa_last_synced_txg(spa) + 4398 TXG_DEFER_SIZE + 1; 4399 vdev_config_dirty(spa->spa_root_vdev); 4400 spa_config_exit(spa, SCL_ALL, FTAG); 4401 } 4402 } 4403 4404 spa_event_notify(spa, NULL, ESC_ZFS_POOL_DESTROY); 4405 4406 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 4407 spa_unload(spa); 4408 spa_deactivate(spa); 4409 } 4410 4411 if (oldconfig && spa->spa_config) 4412 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 4413 4414 if (new_state != POOL_STATE_UNINITIALIZED) { 4415 if (!hardforce) 4416 spa_config_sync(spa, B_TRUE, B_TRUE); 4417 spa_remove(spa); 4418 } 4419 mutex_exit(&spa_namespace_lock); 4420 4421 return (0); 4422 } 4423 4424 /* 4425 * Destroy a storage pool. 4426 */ 4427 int 4428 spa_destroy(char *pool) 4429 { 4430 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 4431 B_FALSE, B_FALSE)); 4432 } 4433 4434 /* 4435 * Export a storage pool. 4436 */ 4437 int 4438 spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 4439 boolean_t hardforce) 4440 { 4441 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 4442 force, hardforce)); 4443 } 4444 4445 /* 4446 * Similar to spa_export(), this unloads the spa_t without actually removing it 4447 * from the namespace in any way. 4448 */ 4449 int 4450 spa_reset(char *pool) 4451 { 4452 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 4453 B_FALSE, B_FALSE)); 4454 } 4455 4456 /* 4457 * ========================================================================== 4458 * Device manipulation 4459 * ========================================================================== 4460 */ 4461 4462 /* 4463 * Add a device to a storage pool. 4464 */ 4465 int 4466 spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 4467 { 4468 uint64_t txg, id; 4469 int error; 4470 vdev_t *rvd = spa->spa_root_vdev; 4471 vdev_t *vd, *tvd; 4472 nvlist_t **spares, **l2cache; 4473 uint_t nspares, nl2cache; 4474 4475 ASSERT(spa_writeable(spa)); 4476 4477 txg = spa_vdev_enter(spa); 4478 4479 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 4480 VDEV_ALLOC_ADD)) != 0) 4481 return (spa_vdev_exit(spa, NULL, txg, error)); 4482 4483 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 4484 4485 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 4486 &nspares) != 0) 4487 nspares = 0; 4488 4489 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 4490 &nl2cache) != 0) 4491 nl2cache = 0; 4492 4493 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 4494 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 4495 4496 if (vd->vdev_children != 0 && 4497 (error = vdev_create(vd, txg, B_FALSE)) != 0) 4498 return (spa_vdev_exit(spa, vd, txg, error)); 4499 4500 /* 4501 * We must validate the spares and l2cache devices after checking the 4502 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 4503 */ 4504 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 4505 return (spa_vdev_exit(spa, vd, txg, error)); 4506 4507 /* 4508 * Transfer each new top-level vdev from vd to rvd. 4509 */ 4510 for (int c = 0; c < vd->vdev_children; c++) { 4511 4512 /* 4513 * Set the vdev id to the first hole, if one exists. 4514 */ 4515 for (id = 0; id < rvd->vdev_children; id++) { 4516 if (rvd->vdev_child[id]->vdev_ishole) { 4517 vdev_free(rvd->vdev_child[id]); 4518 break; 4519 } 4520 } 4521 tvd = vd->vdev_child[c]; 4522 vdev_remove_child(vd, tvd); 4523 tvd->vdev_id = id; 4524 vdev_add_child(rvd, tvd); 4525 vdev_config_dirty(tvd); 4526 } 4527 4528 if (nspares != 0) { 4529 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 4530 ZPOOL_CONFIG_SPARES); 4531 spa_load_spares(spa); 4532 spa->spa_spares.sav_sync = B_TRUE; 4533 } 4534 4535 if (nl2cache != 0) { 4536 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 4537 ZPOOL_CONFIG_L2CACHE); 4538 spa_load_l2cache(spa); 4539 spa->spa_l2cache.sav_sync = B_TRUE; 4540 } 4541 4542 /* 4543 * We have to be careful when adding new vdevs to an existing pool. 4544 * If other threads start allocating from these vdevs before we 4545 * sync the config cache, and we lose power, then upon reboot we may 4546 * fail to open the pool because there are DVAs that the config cache 4547 * can't translate. Therefore, we first add the vdevs without 4548 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 4549 * and then let spa_config_update() initialize the new metaslabs. 4550 * 4551 * spa_load() checks for added-but-not-initialized vdevs, so that 4552 * if we lose power at any point in this sequence, the remaining 4553 * steps will be completed the next time we load the pool. 4554 */ 4555 (void) spa_vdev_exit(spa, vd, txg, 0); 4556 4557 mutex_enter(&spa_namespace_lock); 4558 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4559 spa_event_notify(spa, NULL, ESC_ZFS_VDEV_ADD); 4560 mutex_exit(&spa_namespace_lock); 4561 4562 return (0); 4563 } 4564 4565 /* 4566 * Attach a device to a mirror. The arguments are the path to any device 4567 * in the mirror, and the nvroot for the new device. If the path specifies 4568 * a device that is not mirrored, we automatically insert the mirror vdev. 4569 * 4570 * If 'replacing' is specified, the new device is intended to replace the 4571 * existing device; in this case the two devices are made into their own 4572 * mirror using the 'replacing' vdev, which is functionally identical to 4573 * the mirror vdev (it actually reuses all the same ops) but has a few 4574 * extra rules: you can't attach to it after it's been created, and upon 4575 * completion of resilvering, the first disk (the one being replaced) 4576 * is automatically detached. 4577 */ 4578 int 4579 spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 4580 { 4581 uint64_t txg, dtl_max_txg; 4582 vdev_t *rvd = spa->spa_root_vdev; 4583 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 4584 vdev_ops_t *pvops; 4585 char *oldvdpath, *newvdpath; 4586 int newvd_isspare; 4587 int error; 4588 4589 ASSERT(spa_writeable(spa)); 4590 4591 txg = spa_vdev_enter(spa); 4592 4593 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 4594 4595 if (oldvd == NULL) 4596 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4597 4598 if (!oldvd->vdev_ops->vdev_op_leaf) 4599 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4600 4601 pvd = oldvd->vdev_parent; 4602 4603 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 4604 VDEV_ALLOC_ATTACH)) != 0) 4605 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 4606 4607 if (newrootvd->vdev_children != 1) 4608 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4609 4610 newvd = newrootvd->vdev_child[0]; 4611 4612 if (!newvd->vdev_ops->vdev_op_leaf) 4613 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4614 4615 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 4616 return (spa_vdev_exit(spa, newrootvd, txg, error)); 4617 4618 /* 4619 * Spares can't replace logs 4620 */ 4621 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 4622 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4623 4624 if (!replacing) { 4625 /* 4626 * For attach, the only allowable parent is a mirror or the root 4627 * vdev. 4628 */ 4629 if (pvd->vdev_ops != &vdev_mirror_ops && 4630 pvd->vdev_ops != &vdev_root_ops) 4631 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4632 4633 pvops = &vdev_mirror_ops; 4634 } else { 4635 /* 4636 * Active hot spares can only be replaced by inactive hot 4637 * spares. 4638 */ 4639 if (pvd->vdev_ops == &vdev_spare_ops && 4640 oldvd->vdev_isspare && 4641 !spa_has_spare(spa, newvd->vdev_guid)) 4642 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4643 4644 /* 4645 * If the source is a hot spare, and the parent isn't already a 4646 * spare, then we want to create a new hot spare. Otherwise, we 4647 * want to create a replacing vdev. The user is not allowed to 4648 * attach to a spared vdev child unless the 'isspare' state is 4649 * the same (spare replaces spare, non-spare replaces 4650 * non-spare). 4651 */ 4652 if (pvd->vdev_ops == &vdev_replacing_ops && 4653 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 4654 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4655 } else if (pvd->vdev_ops == &vdev_spare_ops && 4656 newvd->vdev_isspare != oldvd->vdev_isspare) { 4657 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4658 } 4659 4660 if (newvd->vdev_isspare) 4661 pvops = &vdev_spare_ops; 4662 else 4663 pvops = &vdev_replacing_ops; 4664 } 4665 4666 /* 4667 * Make sure the new device is big enough. 4668 */ 4669 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 4670 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 4671 4672 /* 4673 * The new device cannot have a higher alignment requirement 4674 * than the top-level vdev. 4675 */ 4676 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 4677 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 4678 4679 /* 4680 * If this is an in-place replacement, update oldvd's path and devid 4681 * to make it distinguishable from newvd, and unopenable from now on. 4682 */ 4683 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 4684 spa_strfree(oldvd->vdev_path); 4685 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 4686 KM_SLEEP); 4687 (void) sprintf(oldvd->vdev_path, "%s/%s", 4688 newvd->vdev_path, "old"); 4689 if (oldvd->vdev_devid != NULL) { 4690 spa_strfree(oldvd->vdev_devid); 4691 oldvd->vdev_devid = NULL; 4692 } 4693 } 4694 4695 /* mark the device being resilvered */ 4696 newvd->vdev_resilver_txg = txg; 4697 4698 /* 4699 * If the parent is not a mirror, or if we're replacing, insert the new 4700 * mirror/replacing/spare vdev above oldvd. 4701 */ 4702 if (pvd->vdev_ops != pvops) 4703 pvd = vdev_add_parent(oldvd, pvops); 4704 4705 ASSERT(pvd->vdev_top->vdev_parent == rvd); 4706 ASSERT(pvd->vdev_ops == pvops); 4707 ASSERT(oldvd->vdev_parent == pvd); 4708 4709 /* 4710 * Extract the new device from its root and add it to pvd. 4711 */ 4712 vdev_remove_child(newrootvd, newvd); 4713 newvd->vdev_id = pvd->vdev_children; 4714 newvd->vdev_crtxg = oldvd->vdev_crtxg; 4715 vdev_add_child(pvd, newvd); 4716 4717 tvd = newvd->vdev_top; 4718 ASSERT(pvd->vdev_top == tvd); 4719 ASSERT(tvd->vdev_parent == rvd); 4720 4721 vdev_config_dirty(tvd); 4722 4723 /* 4724 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 4725 * for any dmu_sync-ed blocks. It will propagate upward when 4726 * spa_vdev_exit() calls vdev_dtl_reassess(). 4727 */ 4728 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 4729 4730 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 4731 dtl_max_txg - TXG_INITIAL); 4732 4733 if (newvd->vdev_isspare) { 4734 spa_spare_activate(newvd); 4735 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE); 4736 } 4737 4738 oldvdpath = spa_strdup(oldvd->vdev_path); 4739 newvdpath = spa_strdup(newvd->vdev_path); 4740 newvd_isspare = newvd->vdev_isspare; 4741 4742 /* 4743 * Mark newvd's DTL dirty in this txg. 4744 */ 4745 vdev_dirty(tvd, VDD_DTL, newvd, txg); 4746 4747 /* 4748 * Schedule the resilver to restart in the future. We do this to 4749 * ensure that dmu_sync-ed blocks have been stitched into the 4750 * respective datasets. 4751 */ 4752 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 4753 4754 if (spa->spa_bootfs) 4755 spa_event_notify(spa, newvd, ESC_ZFS_BOOTFS_VDEV_ATTACH); 4756 4757 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_ATTACH); 4758 4759 /* 4760 * Commit the config 4761 */ 4762 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 4763 4764 spa_history_log_internal(spa, "vdev attach", NULL, 4765 "%s vdev=%s %s vdev=%s", 4766 replacing && newvd_isspare ? "spare in" : 4767 replacing ? "replace" : "attach", newvdpath, 4768 replacing ? "for" : "to", oldvdpath); 4769 4770 spa_strfree(oldvdpath); 4771 spa_strfree(newvdpath); 4772 4773 return (0); 4774 } 4775 4776 /* 4777 * Detach a device from a mirror or replacing vdev. 4778 * 4779 * If 'replace_done' is specified, only detach if the parent 4780 * is a replacing vdev. 4781 */ 4782 int 4783 spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 4784 { 4785 uint64_t txg; 4786 int error; 4787 vdev_t *rvd = spa->spa_root_vdev; 4788 vdev_t *vd, *pvd, *cvd, *tvd; 4789 boolean_t unspare = B_FALSE; 4790 uint64_t unspare_guid = 0; 4791 char *vdpath; 4792 4793 ASSERT(spa_writeable(spa)); 4794 4795 txg = spa_vdev_enter(spa); 4796 4797 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 4798 4799 if (vd == NULL) 4800 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4801 4802 if (!vd->vdev_ops->vdev_op_leaf) 4803 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4804 4805 pvd = vd->vdev_parent; 4806 4807 /* 4808 * If the parent/child relationship is not as expected, don't do it. 4809 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 4810 * vdev that's replacing B with C. The user's intent in replacing 4811 * is to go from M(A,B) to M(A,C). If the user decides to cancel 4812 * the replace by detaching C, the expected behavior is to end up 4813 * M(A,B). But suppose that right after deciding to detach C, 4814 * the replacement of B completes. We would have M(A,C), and then 4815 * ask to detach C, which would leave us with just A -- not what 4816 * the user wanted. To prevent this, we make sure that the 4817 * parent/child relationship hasn't changed -- in this example, 4818 * that C's parent is still the replacing vdev R. 4819 */ 4820 if (pvd->vdev_guid != pguid && pguid != 0) 4821 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 4822 4823 /* 4824 * Only 'replacing' or 'spare' vdevs can be replaced. 4825 */ 4826 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 4827 pvd->vdev_ops != &vdev_spare_ops) 4828 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4829 4830 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 4831 spa_version(spa) >= SPA_VERSION_SPARES); 4832 4833 /* 4834 * Only mirror, replacing, and spare vdevs support detach. 4835 */ 4836 if (pvd->vdev_ops != &vdev_replacing_ops && 4837 pvd->vdev_ops != &vdev_mirror_ops && 4838 pvd->vdev_ops != &vdev_spare_ops) 4839 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4840 4841 /* 4842 * If this device has the only valid copy of some data, 4843 * we cannot safely detach it. 4844 */ 4845 if (vdev_dtl_required(vd)) 4846 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 4847 4848 ASSERT(pvd->vdev_children >= 2); 4849 4850 /* 4851 * If we are detaching the second disk from a replacing vdev, then 4852 * check to see if we changed the original vdev's path to have "/old" 4853 * at the end in spa_vdev_attach(). If so, undo that change now. 4854 */ 4855 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 4856 vd->vdev_path != NULL) { 4857 size_t len = strlen(vd->vdev_path); 4858 4859 for (int c = 0; c < pvd->vdev_children; c++) { 4860 cvd = pvd->vdev_child[c]; 4861 4862 if (cvd == vd || cvd->vdev_path == NULL) 4863 continue; 4864 4865 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 4866 strcmp(cvd->vdev_path + len, "/old") == 0) { 4867 spa_strfree(cvd->vdev_path); 4868 cvd->vdev_path = spa_strdup(vd->vdev_path); 4869 break; 4870 } 4871 } 4872 } 4873 4874 /* 4875 * If we are detaching the original disk from a spare, then it implies 4876 * that the spare should become a real disk, and be removed from the 4877 * active spare list for the pool. 4878 */ 4879 if (pvd->vdev_ops == &vdev_spare_ops && 4880 vd->vdev_id == 0 && 4881 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 4882 unspare = B_TRUE; 4883 4884 /* 4885 * Erase the disk labels so the disk can be used for other things. 4886 * This must be done after all other error cases are handled, 4887 * but before we disembowel vd (so we can still do I/O to it). 4888 * But if we can't do it, don't treat the error as fatal -- 4889 * it may be that the unwritability of the disk is the reason 4890 * it's being detached! 4891 */ 4892 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 4893 4894 /* 4895 * Remove vd from its parent and compact the parent's children. 4896 */ 4897 vdev_remove_child(pvd, vd); 4898 vdev_compact_children(pvd); 4899 4900 /* 4901 * Remember one of the remaining children so we can get tvd below. 4902 */ 4903 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 4904 4905 /* 4906 * If we need to remove the remaining child from the list of hot spares, 4907 * do it now, marking the vdev as no longer a spare in the process. 4908 * We must do this before vdev_remove_parent(), because that can 4909 * change the GUID if it creates a new toplevel GUID. For a similar 4910 * reason, we must remove the spare now, in the same txg as the detach; 4911 * otherwise someone could attach a new sibling, change the GUID, and 4912 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 4913 */ 4914 if (unspare) { 4915 ASSERT(cvd->vdev_isspare); 4916 spa_spare_remove(cvd); 4917 unspare_guid = cvd->vdev_guid; 4918 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 4919 cvd->vdev_unspare = B_TRUE; 4920 } 4921 4922 /* 4923 * If the parent mirror/replacing vdev only has one child, 4924 * the parent is no longer needed. Remove it from the tree. 4925 */ 4926 if (pvd->vdev_children == 1) { 4927 if (pvd->vdev_ops == &vdev_spare_ops) 4928 cvd->vdev_unspare = B_FALSE; 4929 vdev_remove_parent(cvd); 4930 } 4931 4932 4933 /* 4934 * We don't set tvd until now because the parent we just removed 4935 * may have been the previous top-level vdev. 4936 */ 4937 tvd = cvd->vdev_top; 4938 ASSERT(tvd->vdev_parent == rvd); 4939 4940 /* 4941 * Reevaluate the parent vdev state. 4942 */ 4943 vdev_propagate_state(cvd); 4944 4945 /* 4946 * If the 'autoexpand' property is set on the pool then automatically 4947 * try to expand the size of the pool. For example if the device we 4948 * just detached was smaller than the others, it may be possible to 4949 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 4950 * first so that we can obtain the updated sizes of the leaf vdevs. 4951 */ 4952 if (spa->spa_autoexpand) { 4953 vdev_reopen(tvd); 4954 vdev_expand(tvd, txg); 4955 } 4956 4957 vdev_config_dirty(tvd); 4958 4959 /* 4960 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 4961 * vd->vdev_detached is set and free vd's DTL object in syncing context. 4962 * But first make sure we're not on any *other* txg's DTL list, to 4963 * prevent vd from being accessed after it's freed. 4964 */ 4965 vdpath = spa_strdup(vd->vdev_path); 4966 for (int t = 0; t < TXG_SIZE; t++) 4967 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 4968 vd->vdev_detached = B_TRUE; 4969 vdev_dirty(tvd, VDD_DTL, vd, txg); 4970 4971 spa_event_notify(spa, vd, ESC_ZFS_VDEV_REMOVE); 4972 4973 /* hang on to the spa before we release the lock */ 4974 spa_open_ref(spa, FTAG); 4975 4976 error = spa_vdev_exit(spa, vd, txg, 0); 4977 4978 spa_history_log_internal(spa, "detach", NULL, 4979 "vdev=%s", vdpath); 4980 spa_strfree(vdpath); 4981 4982 /* 4983 * If this was the removal of the original device in a hot spare vdev, 4984 * then we want to go through and remove the device from the hot spare 4985 * list of every other pool. 4986 */ 4987 if (unspare) { 4988 spa_t *altspa = NULL; 4989 4990 mutex_enter(&spa_namespace_lock); 4991 while ((altspa = spa_next(altspa)) != NULL) { 4992 if (altspa->spa_state != POOL_STATE_ACTIVE || 4993 altspa == spa) 4994 continue; 4995 4996 spa_open_ref(altspa, FTAG); 4997 mutex_exit(&spa_namespace_lock); 4998 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 4999 mutex_enter(&spa_namespace_lock); 5000 spa_close(altspa, FTAG); 5001 } 5002 mutex_exit(&spa_namespace_lock); 5003 5004 /* search the rest of the vdevs for spares to remove */ 5005 spa_vdev_resilver_done(spa); 5006 } 5007 5008 /* all done with the spa; OK to release */ 5009 mutex_enter(&spa_namespace_lock); 5010 spa_close(spa, FTAG); 5011 mutex_exit(&spa_namespace_lock); 5012 5013 return (error); 5014 } 5015 5016 /* 5017 * Split a set of devices from their mirrors, and create a new pool from them. 5018 */ 5019 int 5020 spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 5021 nvlist_t *props, boolean_t exp) 5022 { 5023 int error = 0; 5024 uint64_t txg, *glist; 5025 spa_t *newspa; 5026 uint_t c, children, lastlog; 5027 nvlist_t **child, *nvl, *tmp; 5028 dmu_tx_t *tx; 5029 char *altroot = NULL; 5030 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 5031 boolean_t activate_slog; 5032 5033 ASSERT(spa_writeable(spa)); 5034 5035 txg = spa_vdev_enter(spa); 5036 5037 /* clear the log and flush everything up to now */ 5038 activate_slog = spa_passivate_log(spa); 5039 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5040 error = spa_offline_log(spa); 5041 txg = spa_vdev_config_enter(spa); 5042 5043 if (activate_slog) 5044 spa_activate_log(spa); 5045 5046 if (error != 0) 5047 return (spa_vdev_exit(spa, NULL, txg, error)); 5048 5049 /* check new spa name before going any further */ 5050 if (spa_lookup(newname) != NULL) 5051 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 5052 5053 /* 5054 * scan through all the children to ensure they're all mirrors 5055 */ 5056 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 5057 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 5058 &children) != 0) 5059 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5060 5061 /* first, check to ensure we've got the right child count */ 5062 rvd = spa->spa_root_vdev; 5063 lastlog = 0; 5064 for (c = 0; c < rvd->vdev_children; c++) { 5065 vdev_t *vd = rvd->vdev_child[c]; 5066 5067 /* don't count the holes & logs as children */ 5068 if (vd->vdev_islog || vd->vdev_ishole) { 5069 if (lastlog == 0) 5070 lastlog = c; 5071 continue; 5072 } 5073 5074 lastlog = 0; 5075 } 5076 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 5077 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5078 5079 /* next, ensure no spare or cache devices are part of the split */ 5080 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 5081 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 5082 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5083 5084 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 5085 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 5086 5087 /* then, loop over each vdev and validate it */ 5088 for (c = 0; c < children; c++) { 5089 uint64_t is_hole = 0; 5090 5091 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 5092 &is_hole); 5093 5094 if (is_hole != 0) { 5095 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 5096 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 5097 continue; 5098 } else { 5099 error = SET_ERROR(EINVAL); 5100 break; 5101 } 5102 } 5103 5104 /* which disk is going to be split? */ 5105 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 5106 &glist[c]) != 0) { 5107 error = SET_ERROR(EINVAL); 5108 break; 5109 } 5110 5111 /* look it up in the spa */ 5112 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 5113 if (vml[c] == NULL) { 5114 error = SET_ERROR(ENODEV); 5115 break; 5116 } 5117 5118 /* make sure there's nothing stopping the split */ 5119 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 5120 vml[c]->vdev_islog || 5121 vml[c]->vdev_ishole || 5122 vml[c]->vdev_isspare || 5123 vml[c]->vdev_isl2cache || 5124 !vdev_writeable(vml[c]) || 5125 vml[c]->vdev_children != 0 || 5126 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 5127 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 5128 error = SET_ERROR(EINVAL); 5129 break; 5130 } 5131 5132 if (vdev_dtl_required(vml[c])) { 5133 error = SET_ERROR(EBUSY); 5134 break; 5135 } 5136 5137 /* we need certain info from the top level */ 5138 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 5139 vml[c]->vdev_top->vdev_ms_array) == 0); 5140 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 5141 vml[c]->vdev_top->vdev_ms_shift) == 0); 5142 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 5143 vml[c]->vdev_top->vdev_asize) == 0); 5144 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 5145 vml[c]->vdev_top->vdev_ashift) == 0); 5146 5147 /* transfer per-vdev ZAPs */ 5148 ASSERT3U(vml[c]->vdev_leaf_zap, !=, 0); 5149 VERIFY0(nvlist_add_uint64(child[c], 5150 ZPOOL_CONFIG_VDEV_LEAF_ZAP, vml[c]->vdev_leaf_zap)); 5151 5152 ASSERT3U(vml[c]->vdev_top->vdev_top_zap, !=, 0); 5153 VERIFY0(nvlist_add_uint64(child[c], 5154 ZPOOL_CONFIG_VDEV_TOP_ZAP, 5155 vml[c]->vdev_parent->vdev_top_zap)); 5156 } 5157 5158 if (error != 0) { 5159 kmem_free(vml, children * sizeof (vdev_t *)); 5160 kmem_free(glist, children * sizeof (uint64_t)); 5161 return (spa_vdev_exit(spa, NULL, txg, error)); 5162 } 5163 5164 /* stop writers from using the disks */ 5165 for (c = 0; c < children; c++) { 5166 if (vml[c] != NULL) 5167 vml[c]->vdev_offline = B_TRUE; 5168 } 5169 vdev_reopen(spa->spa_root_vdev); 5170 5171 /* 5172 * Temporarily record the splitting vdevs in the spa config. This 5173 * will disappear once the config is regenerated. 5174 */ 5175 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5176 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 5177 glist, children) == 0); 5178 kmem_free(glist, children * sizeof (uint64_t)); 5179 5180 mutex_enter(&spa->spa_props_lock); 5181 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 5182 nvl) == 0); 5183 mutex_exit(&spa->spa_props_lock); 5184 spa->spa_config_splitting = nvl; 5185 vdev_config_dirty(spa->spa_root_vdev); 5186 5187 /* configure and create the new pool */ 5188 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 5189 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5190 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 5191 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 5192 spa_version(spa)) == 0); 5193 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 5194 spa->spa_config_txg) == 0); 5195 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 5196 spa_generate_guid(NULL)) == 0); 5197 VERIFY0(nvlist_add_boolean(config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); 5198 (void) nvlist_lookup_string(props, 5199 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5200 5201 /* add the new pool to the namespace */ 5202 newspa = spa_add(newname, config, altroot); 5203 newspa->spa_avz_action = AVZ_ACTION_REBUILD; 5204 newspa->spa_config_txg = spa->spa_config_txg; 5205 spa_set_log_state(newspa, SPA_LOG_CLEAR); 5206 5207 /* release the spa config lock, retaining the namespace lock */ 5208 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5209 5210 if (zio_injection_enabled) 5211 zio_handle_panic_injection(spa, FTAG, 1); 5212 5213 spa_activate(newspa, spa_mode_global); 5214 spa_async_suspend(newspa); 5215 5216 /* create the new pool from the disks of the original pool */ 5217 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE); 5218 if (error) 5219 goto out; 5220 5221 /* if that worked, generate a real config for the new pool */ 5222 if (newspa->spa_root_vdev != NULL) { 5223 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 5224 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5225 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 5226 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 5227 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 5228 B_TRUE)); 5229 } 5230 5231 /* set the props */ 5232 if (props != NULL) { 5233 spa_configfile_set(newspa, props, B_FALSE); 5234 error = spa_prop_set(newspa, props); 5235 if (error) 5236 goto out; 5237 } 5238 5239 /* flush everything */ 5240 txg = spa_vdev_config_enter(newspa); 5241 vdev_config_dirty(newspa->spa_root_vdev); 5242 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 5243 5244 if (zio_injection_enabled) 5245 zio_handle_panic_injection(spa, FTAG, 2); 5246 5247 spa_async_resume(newspa); 5248 5249 /* finally, update the original pool's config */ 5250 txg = spa_vdev_config_enter(spa); 5251 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 5252 error = dmu_tx_assign(tx, TXG_WAIT); 5253 if (error != 0) 5254 dmu_tx_abort(tx); 5255 for (c = 0; c < children; c++) { 5256 if (vml[c] != NULL) { 5257 vdev_split(vml[c]); 5258 if (error == 0) 5259 spa_history_log_internal(spa, "detach", tx, 5260 "vdev=%s", vml[c]->vdev_path); 5261 5262 vdev_free(vml[c]); 5263 } 5264 } 5265 spa->spa_avz_action = AVZ_ACTION_REBUILD; 5266 vdev_config_dirty(spa->spa_root_vdev); 5267 spa->spa_config_splitting = NULL; 5268 nvlist_free(nvl); 5269 if (error == 0) 5270 dmu_tx_commit(tx); 5271 (void) spa_vdev_exit(spa, NULL, txg, 0); 5272 5273 if (zio_injection_enabled) 5274 zio_handle_panic_injection(spa, FTAG, 3); 5275 5276 /* split is complete; log a history record */ 5277 spa_history_log_internal(newspa, "split", NULL, 5278 "from pool %s", spa_name(spa)); 5279 5280 kmem_free(vml, children * sizeof (vdev_t *)); 5281 5282 /* if we're not going to mount the filesystems in userland, export */ 5283 if (exp) 5284 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 5285 B_FALSE, B_FALSE); 5286 5287 return (error); 5288 5289 out: 5290 spa_unload(newspa); 5291 spa_deactivate(newspa); 5292 spa_remove(newspa); 5293 5294 txg = spa_vdev_config_enter(spa); 5295 5296 /* re-online all offlined disks */ 5297 for (c = 0; c < children; c++) { 5298 if (vml[c] != NULL) 5299 vml[c]->vdev_offline = B_FALSE; 5300 } 5301 vdev_reopen(spa->spa_root_vdev); 5302 5303 nvlist_free(spa->spa_config_splitting); 5304 spa->spa_config_splitting = NULL; 5305 (void) spa_vdev_exit(spa, NULL, txg, error); 5306 5307 kmem_free(vml, children * sizeof (vdev_t *)); 5308 return (error); 5309 } 5310 5311 static nvlist_t * 5312 spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid) 5313 { 5314 for (int i = 0; i < count; i++) { 5315 uint64_t guid; 5316 5317 VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID, 5318 &guid) == 0); 5319 5320 if (guid == target_guid) 5321 return (nvpp[i]); 5322 } 5323 5324 return (NULL); 5325 } 5326 5327 static void 5328 spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count, 5329 nvlist_t *dev_to_remove) 5330 { 5331 nvlist_t **newdev = NULL; 5332 5333 if (count > 1) 5334 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP); 5335 5336 for (int i = 0, j = 0; i < count; i++) { 5337 if (dev[i] == dev_to_remove) 5338 continue; 5339 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0); 5340 } 5341 5342 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0); 5343 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0); 5344 5345 for (int i = 0; i < count - 1; i++) 5346 nvlist_free(newdev[i]); 5347 5348 if (count > 1) 5349 kmem_free(newdev, (count - 1) * sizeof (void *)); 5350 } 5351 5352 /* 5353 * Evacuate the device. 5354 */ 5355 static int 5356 spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd) 5357 { 5358 uint64_t txg; 5359 int error = 0; 5360 5361 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5362 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5363 ASSERT(vd == vd->vdev_top); 5364 5365 /* 5366 * Evacuate the device. We don't hold the config lock as writer 5367 * since we need to do I/O but we do keep the 5368 * spa_namespace_lock held. Once this completes the device 5369 * should no longer have any blocks allocated on it. 5370 */ 5371 if (vd->vdev_islog) { 5372 if (vd->vdev_stat.vs_alloc != 0) 5373 error = spa_offline_log(spa); 5374 } else { 5375 error = SET_ERROR(ENOTSUP); 5376 } 5377 5378 if (error) 5379 return (error); 5380 5381 /* 5382 * The evacuation succeeded. Remove any remaining MOS metadata 5383 * associated with this vdev, and wait for these changes to sync. 5384 */ 5385 ASSERT0(vd->vdev_stat.vs_alloc); 5386 txg = spa_vdev_config_enter(spa); 5387 vd->vdev_removing = B_TRUE; 5388 vdev_dirty_leaves(vd, VDD_DTL, txg); 5389 vdev_config_dirty(vd); 5390 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5391 5392 return (0); 5393 } 5394 5395 /* 5396 * Complete the removal by cleaning up the namespace. 5397 */ 5398 static void 5399 spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd) 5400 { 5401 vdev_t *rvd = spa->spa_root_vdev; 5402 uint64_t id = vd->vdev_id; 5403 boolean_t last_vdev = (id == (rvd->vdev_children - 1)); 5404 5405 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5406 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 5407 ASSERT(vd == vd->vdev_top); 5408 5409 /* 5410 * Only remove any devices which are empty. 5411 */ 5412 if (vd->vdev_stat.vs_alloc != 0) 5413 return; 5414 5415 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5416 5417 if (list_link_active(&vd->vdev_state_dirty_node)) 5418 vdev_state_clean(vd); 5419 if (list_link_active(&vd->vdev_config_dirty_node)) 5420 vdev_config_clean(vd); 5421 5422 vdev_free(vd); 5423 5424 if (last_vdev) { 5425 vdev_compact_children(rvd); 5426 } else { 5427 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops); 5428 vdev_add_child(rvd, vd); 5429 } 5430 vdev_config_dirty(rvd); 5431 5432 /* 5433 * Reassess the health of our root vdev. 5434 */ 5435 vdev_reopen(rvd); 5436 } 5437 5438 /* 5439 * Remove a device from the pool - 5440 * 5441 * Removing a device from the vdev namespace requires several steps 5442 * and can take a significant amount of time. As a result we use 5443 * the spa_vdev_config_[enter/exit] functions which allow us to 5444 * grab and release the spa_config_lock while still holding the namespace 5445 * lock. During each step the configuration is synced out. 5446 * 5447 * Currently, this supports removing only hot spares, slogs, and level 2 ARC 5448 * devices. 5449 */ 5450 int 5451 spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare) 5452 { 5453 vdev_t *vd; 5454 metaslab_group_t *mg; 5455 nvlist_t **spares, **l2cache, *nv; 5456 uint64_t txg = 0; 5457 uint_t nspares, nl2cache; 5458 int error = 0; 5459 boolean_t locked = MUTEX_HELD(&spa_namespace_lock); 5460 5461 ASSERT(spa_writeable(spa)); 5462 5463 if (!locked) 5464 txg = spa_vdev_enter(spa); 5465 5466 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5467 5468 if (spa->spa_spares.sav_vdevs != NULL && 5469 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 5470 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 && 5471 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) { 5472 /* 5473 * Only remove the hot spare if it's not currently in use 5474 * in this pool. 5475 */ 5476 if (vd == NULL || unspare) { 5477 spa_vdev_remove_aux(spa->spa_spares.sav_config, 5478 ZPOOL_CONFIG_SPARES, spares, nspares, nv); 5479 spa_load_spares(spa); 5480 spa->spa_spares.sav_sync = B_TRUE; 5481 } else { 5482 error = SET_ERROR(EBUSY); 5483 } 5484 } else if (spa->spa_l2cache.sav_vdevs != NULL && 5485 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 5486 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 && 5487 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) { 5488 /* 5489 * Cache devices can always be removed. 5490 */ 5491 spa_vdev_remove_aux(spa->spa_l2cache.sav_config, 5492 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv); 5493 spa_load_l2cache(spa); 5494 spa->spa_l2cache.sav_sync = B_TRUE; 5495 } else if (vd != NULL && vd->vdev_islog) { 5496 ASSERT(!locked); 5497 ASSERT(vd == vd->vdev_top); 5498 5499 mg = vd->vdev_mg; 5500 5501 /* 5502 * Stop allocating from this vdev. 5503 */ 5504 metaslab_group_passivate(mg); 5505 5506 /* 5507 * Wait for the youngest allocations and frees to sync, 5508 * and then wait for the deferral of those frees to finish. 5509 */ 5510 spa_vdev_config_exit(spa, NULL, 5511 txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG); 5512 5513 /* 5514 * Attempt to evacuate the vdev. 5515 */ 5516 error = spa_vdev_remove_evacuate(spa, vd); 5517 5518 txg = spa_vdev_config_enter(spa); 5519 5520 /* 5521 * If we couldn't evacuate the vdev, unwind. 5522 */ 5523 if (error) { 5524 metaslab_group_activate(mg); 5525 return (spa_vdev_exit(spa, NULL, txg, error)); 5526 } 5527 5528 /* 5529 * Clean up the vdev namespace. 5530 */ 5531 spa_vdev_remove_from_namespace(spa, vd); 5532 5533 } else if (vd != NULL) { 5534 /* 5535 * Normal vdevs cannot be removed (yet). 5536 */ 5537 error = SET_ERROR(ENOTSUP); 5538 } else { 5539 /* 5540 * There is no vdev of any kind with the specified guid. 5541 */ 5542 error = SET_ERROR(ENOENT); 5543 } 5544 5545 if (!locked) 5546 return (spa_vdev_exit(spa, NULL, txg, error)); 5547 5548 return (error); 5549 } 5550 5551 /* 5552 * Find any device that's done replacing, or a vdev marked 'unspare' that's 5553 * currently spared, so we can detach it. 5554 */ 5555 static vdev_t * 5556 spa_vdev_resilver_done_hunt(vdev_t *vd) 5557 { 5558 vdev_t *newvd, *oldvd; 5559 5560 for (int c = 0; c < vd->vdev_children; c++) { 5561 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 5562 if (oldvd != NULL) 5563 return (oldvd); 5564 } 5565 5566 /* 5567 * Check for a completed replacement. We always consider the first 5568 * vdev in the list to be the oldest vdev, and the last one to be 5569 * the newest (see spa_vdev_attach() for how that works). In 5570 * the case where the newest vdev is faulted, we will not automatically 5571 * remove it after a resilver completes. This is OK as it will require 5572 * user intervention to determine which disk the admin wishes to keep. 5573 */ 5574 if (vd->vdev_ops == &vdev_replacing_ops) { 5575 ASSERT(vd->vdev_children > 1); 5576 5577 newvd = vd->vdev_child[vd->vdev_children - 1]; 5578 oldvd = vd->vdev_child[0]; 5579 5580 if (vdev_dtl_empty(newvd, DTL_MISSING) && 5581 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5582 !vdev_dtl_required(oldvd)) 5583 return (oldvd); 5584 } 5585 5586 /* 5587 * Check for a completed resilver with the 'unspare' flag set. 5588 */ 5589 if (vd->vdev_ops == &vdev_spare_ops) { 5590 vdev_t *first = vd->vdev_child[0]; 5591 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 5592 5593 if (last->vdev_unspare) { 5594 oldvd = first; 5595 newvd = last; 5596 } else if (first->vdev_unspare) { 5597 oldvd = last; 5598 newvd = first; 5599 } else { 5600 oldvd = NULL; 5601 } 5602 5603 if (oldvd != NULL && 5604 vdev_dtl_empty(newvd, DTL_MISSING) && 5605 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5606 !vdev_dtl_required(oldvd)) 5607 return (oldvd); 5608 5609 /* 5610 * If there are more than two spares attached to a disk, 5611 * and those spares are not required, then we want to 5612 * attempt to free them up now so that they can be used 5613 * by other pools. Once we're back down to a single 5614 * disk+spare, we stop removing them. 5615 */ 5616 if (vd->vdev_children > 2) { 5617 newvd = vd->vdev_child[1]; 5618 5619 if (newvd->vdev_isspare && last->vdev_isspare && 5620 vdev_dtl_empty(last, DTL_MISSING) && 5621 vdev_dtl_empty(last, DTL_OUTAGE) && 5622 !vdev_dtl_required(newvd)) 5623 return (newvd); 5624 } 5625 } 5626 5627 return (NULL); 5628 } 5629 5630 static void 5631 spa_vdev_resilver_done(spa_t *spa) 5632 { 5633 vdev_t *vd, *pvd, *ppvd; 5634 uint64_t guid, sguid, pguid, ppguid; 5635 5636 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5637 5638 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 5639 pvd = vd->vdev_parent; 5640 ppvd = pvd->vdev_parent; 5641 guid = vd->vdev_guid; 5642 pguid = pvd->vdev_guid; 5643 ppguid = ppvd->vdev_guid; 5644 sguid = 0; 5645 /* 5646 * If we have just finished replacing a hot spared device, then 5647 * we need to detach the parent's first child (the original hot 5648 * spare) as well. 5649 */ 5650 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 5651 ppvd->vdev_children == 2) { 5652 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 5653 sguid = ppvd->vdev_child[1]->vdev_guid; 5654 } 5655 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 5656 5657 spa_config_exit(spa, SCL_ALL, FTAG); 5658 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 5659 return; 5660 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 5661 return; 5662 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5663 } 5664 5665 spa_config_exit(spa, SCL_ALL, FTAG); 5666 } 5667 5668 /* 5669 * Update the stored path or FRU for this vdev. 5670 */ 5671 int 5672 spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 5673 boolean_t ispath) 5674 { 5675 vdev_t *vd; 5676 boolean_t sync = B_FALSE; 5677 5678 ASSERT(spa_writeable(spa)); 5679 5680 spa_vdev_state_enter(spa, SCL_ALL); 5681 5682 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 5683 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 5684 5685 if (!vd->vdev_ops->vdev_op_leaf) 5686 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 5687 5688 if (ispath) { 5689 if (strcmp(value, vd->vdev_path) != 0) { 5690 spa_strfree(vd->vdev_path); 5691 vd->vdev_path = spa_strdup(value); 5692 sync = B_TRUE; 5693 } 5694 } else { 5695 if (vd->vdev_fru == NULL) { 5696 vd->vdev_fru = spa_strdup(value); 5697 sync = B_TRUE; 5698 } else if (strcmp(value, vd->vdev_fru) != 0) { 5699 spa_strfree(vd->vdev_fru); 5700 vd->vdev_fru = spa_strdup(value); 5701 sync = B_TRUE; 5702 } 5703 } 5704 5705 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 5706 } 5707 5708 int 5709 spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 5710 { 5711 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 5712 } 5713 5714 int 5715 spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 5716 { 5717 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 5718 } 5719 5720 /* 5721 * ========================================================================== 5722 * SPA Scanning 5723 * ========================================================================== 5724 */ 5725 5726 int 5727 spa_scan_stop(spa_t *spa) 5728 { 5729 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5730 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 5731 return (SET_ERROR(EBUSY)); 5732 return (dsl_scan_cancel(spa->spa_dsl_pool)); 5733 } 5734 5735 int 5736 spa_scan(spa_t *spa, pool_scan_func_t func) 5737 { 5738 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5739 5740 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 5741 return (SET_ERROR(ENOTSUP)); 5742 5743 /* 5744 * If a resilver was requested, but there is no DTL on a 5745 * writeable leaf device, we have nothing to do. 5746 */ 5747 if (func == POOL_SCAN_RESILVER && 5748 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 5749 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 5750 return (0); 5751 } 5752 5753 return (dsl_scan(spa->spa_dsl_pool, func)); 5754 } 5755 5756 /* 5757 * ========================================================================== 5758 * SPA async task processing 5759 * ========================================================================== 5760 */ 5761 5762 static void 5763 spa_async_remove(spa_t *spa, vdev_t *vd) 5764 { 5765 if (vd->vdev_remove_wanted) { 5766 vd->vdev_remove_wanted = B_FALSE; 5767 vd->vdev_delayed_close = B_FALSE; 5768 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 5769 5770 /* 5771 * We want to clear the stats, but we don't want to do a full 5772 * vdev_clear() as that will cause us to throw away 5773 * degraded/faulted state as well as attempt to reopen the 5774 * device, all of which is a waste. 5775 */ 5776 vd->vdev_stat.vs_read_errors = 0; 5777 vd->vdev_stat.vs_write_errors = 0; 5778 vd->vdev_stat.vs_checksum_errors = 0; 5779 5780 vdev_state_dirty(vd->vdev_top); 5781 } 5782 5783 for (int c = 0; c < vd->vdev_children; c++) 5784 spa_async_remove(spa, vd->vdev_child[c]); 5785 } 5786 5787 static void 5788 spa_async_probe(spa_t *spa, vdev_t *vd) 5789 { 5790 if (vd->vdev_probe_wanted) { 5791 vd->vdev_probe_wanted = B_FALSE; 5792 vdev_reopen(vd); /* vdev_open() does the actual probe */ 5793 } 5794 5795 for (int c = 0; c < vd->vdev_children; c++) 5796 spa_async_probe(spa, vd->vdev_child[c]); 5797 } 5798 5799 static void 5800 spa_async_autoexpand(spa_t *spa, vdev_t *vd) 5801 { 5802 sysevent_id_t eid; 5803 nvlist_t *attr; 5804 char *physpath; 5805 5806 if (!spa->spa_autoexpand) 5807 return; 5808 5809 for (int c = 0; c < vd->vdev_children; c++) { 5810 vdev_t *cvd = vd->vdev_child[c]; 5811 spa_async_autoexpand(spa, cvd); 5812 } 5813 5814 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 5815 return; 5816 5817 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 5818 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 5819 5820 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5821 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 5822 5823 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 5824 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 5825 5826 nvlist_free(attr); 5827 kmem_free(physpath, MAXPATHLEN); 5828 } 5829 5830 static void 5831 spa_async_thread(spa_t *spa) 5832 { 5833 int tasks; 5834 5835 ASSERT(spa->spa_sync_on); 5836 5837 mutex_enter(&spa->spa_async_lock); 5838 tasks = spa->spa_async_tasks; 5839 spa->spa_async_tasks = 0; 5840 mutex_exit(&spa->spa_async_lock); 5841 5842 /* 5843 * See if the config needs to be updated. 5844 */ 5845 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 5846 uint64_t old_space, new_space; 5847 5848 mutex_enter(&spa_namespace_lock); 5849 old_space = metaslab_class_get_space(spa_normal_class(spa)); 5850 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 5851 new_space = metaslab_class_get_space(spa_normal_class(spa)); 5852 mutex_exit(&spa_namespace_lock); 5853 5854 /* 5855 * If the pool grew as a result of the config update, 5856 * then log an internal history event. 5857 */ 5858 if (new_space != old_space) { 5859 spa_history_log_internal(spa, "vdev online", NULL, 5860 "pool '%s' size: %llu(+%llu)", 5861 spa_name(spa), new_space, new_space - old_space); 5862 } 5863 } 5864 5865 /* 5866 * See if any devices need to be marked REMOVED. 5867 */ 5868 if (tasks & SPA_ASYNC_REMOVE) { 5869 spa_vdev_state_enter(spa, SCL_NONE); 5870 spa_async_remove(spa, spa->spa_root_vdev); 5871 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 5872 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 5873 for (int i = 0; i < spa->spa_spares.sav_count; i++) 5874 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 5875 (void) spa_vdev_state_exit(spa, NULL, 0); 5876 } 5877 5878 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 5879 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 5880 spa_async_autoexpand(spa, spa->spa_root_vdev); 5881 spa_config_exit(spa, SCL_CONFIG, FTAG); 5882 } 5883 5884 /* 5885 * See if any devices need to be probed. 5886 */ 5887 if (tasks & SPA_ASYNC_PROBE) { 5888 spa_vdev_state_enter(spa, SCL_NONE); 5889 spa_async_probe(spa, spa->spa_root_vdev); 5890 (void) spa_vdev_state_exit(spa, NULL, 0); 5891 } 5892 5893 /* 5894 * If any devices are done replacing, detach them. 5895 */ 5896 if (tasks & SPA_ASYNC_RESILVER_DONE) 5897 spa_vdev_resilver_done(spa); 5898 5899 /* 5900 * Kick off a resilver. 5901 */ 5902 if (tasks & SPA_ASYNC_RESILVER) 5903 dsl_resilver_restart(spa->spa_dsl_pool, 0); 5904 5905 /* 5906 * Let the world know that we're done. 5907 */ 5908 mutex_enter(&spa->spa_async_lock); 5909 spa->spa_async_thread = NULL; 5910 cv_broadcast(&spa->spa_async_cv); 5911 mutex_exit(&spa->spa_async_lock); 5912 thread_exit(); 5913 } 5914 5915 void 5916 spa_async_suspend(spa_t *spa) 5917 { 5918 mutex_enter(&spa->spa_async_lock); 5919 spa->spa_async_suspended++; 5920 while (spa->spa_async_thread != NULL) 5921 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 5922 mutex_exit(&spa->spa_async_lock); 5923 } 5924 5925 void 5926 spa_async_resume(spa_t *spa) 5927 { 5928 mutex_enter(&spa->spa_async_lock); 5929 ASSERT(spa->spa_async_suspended != 0); 5930 spa->spa_async_suspended--; 5931 mutex_exit(&spa->spa_async_lock); 5932 } 5933 5934 static boolean_t 5935 spa_async_tasks_pending(spa_t *spa) 5936 { 5937 uint_t non_config_tasks; 5938 uint_t config_task; 5939 boolean_t config_task_suspended; 5940 5941 non_config_tasks = spa->spa_async_tasks & ~SPA_ASYNC_CONFIG_UPDATE; 5942 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 5943 if (spa->spa_ccw_fail_time == 0) { 5944 config_task_suspended = B_FALSE; 5945 } else { 5946 config_task_suspended = 5947 (gethrtime() - spa->spa_ccw_fail_time) < 5948 (zfs_ccw_retry_interval * NANOSEC); 5949 } 5950 5951 return (non_config_tasks || (config_task && !config_task_suspended)); 5952 } 5953 5954 static void 5955 spa_async_dispatch(spa_t *spa) 5956 { 5957 mutex_enter(&spa->spa_async_lock); 5958 if (spa_async_tasks_pending(spa) && 5959 !spa->spa_async_suspended && 5960 spa->spa_async_thread == NULL && 5961 rootdir != NULL) 5962 spa->spa_async_thread = thread_create(NULL, 0, 5963 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 5964 mutex_exit(&spa->spa_async_lock); 5965 } 5966 5967 void 5968 spa_async_request(spa_t *spa, int task) 5969 { 5970 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 5971 mutex_enter(&spa->spa_async_lock); 5972 spa->spa_async_tasks |= task; 5973 mutex_exit(&spa->spa_async_lock); 5974 } 5975 5976 /* 5977 * ========================================================================== 5978 * SPA syncing routines 5979 * ========================================================================== 5980 */ 5981 5982 static int 5983 bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 5984 { 5985 bpobj_t *bpo = arg; 5986 bpobj_enqueue(bpo, bp, tx); 5987 return (0); 5988 } 5989 5990 static int 5991 spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 5992 { 5993 zio_t *zio = arg; 5994 5995 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 5996 zio->io_flags)); 5997 return (0); 5998 } 5999 6000 /* 6001 * Note: this simple function is not inlined to make it easier to dtrace the 6002 * amount of time spent syncing frees. 6003 */ 6004 static void 6005 spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 6006 { 6007 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6008 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 6009 VERIFY(zio_wait(zio) == 0); 6010 } 6011 6012 /* 6013 * Note: this simple function is not inlined to make it easier to dtrace the 6014 * amount of time spent syncing deferred frees. 6015 */ 6016 static void 6017 spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 6018 { 6019 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6020 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 6021 spa_free_sync_cb, zio, tx), ==, 0); 6022 VERIFY0(zio_wait(zio)); 6023 } 6024 6025 6026 static void 6027 spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 6028 { 6029 char *packed = NULL; 6030 size_t bufsize; 6031 size_t nvsize = 0; 6032 dmu_buf_t *db; 6033 6034 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 6035 6036 /* 6037 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 6038 * information. This avoids the dmu_buf_will_dirty() path and 6039 * saves us a pre-read to get data we don't actually care about. 6040 */ 6041 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 6042 packed = kmem_alloc(bufsize, KM_SLEEP); 6043 6044 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 6045 KM_SLEEP) == 0); 6046 bzero(packed + nvsize, bufsize - nvsize); 6047 6048 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 6049 6050 kmem_free(packed, bufsize); 6051 6052 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 6053 dmu_buf_will_dirty(db, tx); 6054 *(uint64_t *)db->db_data = nvsize; 6055 dmu_buf_rele(db, FTAG); 6056 } 6057 6058 static void 6059 spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 6060 const char *config, const char *entry) 6061 { 6062 nvlist_t *nvroot; 6063 nvlist_t **list; 6064 int i; 6065 6066 if (!sav->sav_sync) 6067 return; 6068 6069 /* 6070 * Update the MOS nvlist describing the list of available devices. 6071 * spa_validate_aux() will have already made sure this nvlist is 6072 * valid and the vdevs are labeled appropriately. 6073 */ 6074 if (sav->sav_object == 0) { 6075 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 6076 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 6077 sizeof (uint64_t), tx); 6078 VERIFY(zap_update(spa->spa_meta_objset, 6079 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 6080 &sav->sav_object, tx) == 0); 6081 } 6082 6083 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6084 if (sav->sav_count == 0) { 6085 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 6086 } else { 6087 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 6088 for (i = 0; i < sav->sav_count; i++) 6089 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 6090 B_FALSE, VDEV_CONFIG_L2CACHE); 6091 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 6092 sav->sav_count) == 0); 6093 for (i = 0; i < sav->sav_count; i++) 6094 nvlist_free(list[i]); 6095 kmem_free(list, sav->sav_count * sizeof (void *)); 6096 } 6097 6098 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 6099 nvlist_free(nvroot); 6100 6101 sav->sav_sync = B_FALSE; 6102 } 6103 6104 /* 6105 * Rebuild spa's all-vdev ZAP from the vdev ZAPs indicated in each vdev_t. 6106 * The all-vdev ZAP must be empty. 6107 */ 6108 static void 6109 spa_avz_build(vdev_t *vd, uint64_t avz, dmu_tx_t *tx) 6110 { 6111 spa_t *spa = vd->vdev_spa; 6112 if (vd->vdev_top_zap != 0) { 6113 VERIFY0(zap_add_int(spa->spa_meta_objset, avz, 6114 vd->vdev_top_zap, tx)); 6115 } 6116 if (vd->vdev_leaf_zap != 0) { 6117 VERIFY0(zap_add_int(spa->spa_meta_objset, avz, 6118 vd->vdev_leaf_zap, tx)); 6119 } 6120 for (uint64_t i = 0; i < vd->vdev_children; i++) { 6121 spa_avz_build(vd->vdev_child[i], avz, tx); 6122 } 6123 } 6124 6125 static void 6126 spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 6127 { 6128 nvlist_t *config; 6129 6130 /* 6131 * If the pool is being imported from a pre-per-vdev-ZAP version of ZFS, 6132 * its config may not be dirty but we still need to build per-vdev ZAPs. 6133 * Similarly, if the pool is being assembled (e.g. after a split), we 6134 * need to rebuild the AVZ although the config may not be dirty. 6135 */ 6136 if (list_is_empty(&spa->spa_config_dirty_list) && 6137 spa->spa_avz_action == AVZ_ACTION_NONE) 6138 return; 6139 6140 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6141 6142 ASSERT(spa->spa_avz_action == AVZ_ACTION_NONE || 6143 spa->spa_all_vdev_zaps != 0); 6144 6145 if (spa->spa_avz_action == AVZ_ACTION_REBUILD) { 6146 /* Make and build the new AVZ */ 6147 uint64_t new_avz = zap_create(spa->spa_meta_objset, 6148 DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx); 6149 spa_avz_build(spa->spa_root_vdev, new_avz, tx); 6150 6151 /* Diff old AVZ with new one */ 6152 zap_cursor_t zc; 6153 zap_attribute_t za; 6154 6155 for (zap_cursor_init(&zc, spa->spa_meta_objset, 6156 spa->spa_all_vdev_zaps); 6157 zap_cursor_retrieve(&zc, &za) == 0; 6158 zap_cursor_advance(&zc)) { 6159 uint64_t vdzap = za.za_first_integer; 6160 if (zap_lookup_int(spa->spa_meta_objset, new_avz, 6161 vdzap) == ENOENT) { 6162 /* 6163 * ZAP is listed in old AVZ but not in new one; 6164 * destroy it 6165 */ 6166 VERIFY0(zap_destroy(spa->spa_meta_objset, vdzap, 6167 tx)); 6168 } 6169 } 6170 6171 zap_cursor_fini(&zc); 6172 6173 /* Destroy the old AVZ */ 6174 VERIFY0(zap_destroy(spa->spa_meta_objset, 6175 spa->spa_all_vdev_zaps, tx)); 6176 6177 /* Replace the old AVZ in the dir obj with the new one */ 6178 VERIFY0(zap_update(spa->spa_meta_objset, 6179 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, 6180 sizeof (new_avz), 1, &new_avz, tx)); 6181 6182 spa->spa_all_vdev_zaps = new_avz; 6183 } else if (spa->spa_avz_action == AVZ_ACTION_DESTROY) { 6184 zap_cursor_t zc; 6185 zap_attribute_t za; 6186 6187 /* Walk through the AVZ and destroy all listed ZAPs */ 6188 for (zap_cursor_init(&zc, spa->spa_meta_objset, 6189 spa->spa_all_vdev_zaps); 6190 zap_cursor_retrieve(&zc, &za) == 0; 6191 zap_cursor_advance(&zc)) { 6192 uint64_t zap = za.za_first_integer; 6193 VERIFY0(zap_destroy(spa->spa_meta_objset, zap, tx)); 6194 } 6195 6196 zap_cursor_fini(&zc); 6197 6198 /* Destroy and unlink the AVZ itself */ 6199 VERIFY0(zap_destroy(spa->spa_meta_objset, 6200 spa->spa_all_vdev_zaps, tx)); 6201 VERIFY0(zap_remove(spa->spa_meta_objset, 6202 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, tx)); 6203 spa->spa_all_vdev_zaps = 0; 6204 } 6205 6206 if (spa->spa_all_vdev_zaps == 0) { 6207 spa->spa_all_vdev_zaps = zap_create_link(spa->spa_meta_objset, 6208 DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT, 6209 DMU_POOL_VDEV_ZAP_MAP, tx); 6210 } 6211 spa->spa_avz_action = AVZ_ACTION_NONE; 6212 6213 /* Create ZAPs for vdevs that don't have them. */ 6214 vdev_construct_zaps(spa->spa_root_vdev, tx); 6215 6216 config = spa_config_generate(spa, spa->spa_root_vdev, 6217 dmu_tx_get_txg(tx), B_FALSE); 6218 6219 /* 6220 * If we're upgrading the spa version then make sure that 6221 * the config object gets updated with the correct version. 6222 */ 6223 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 6224 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6225 spa->spa_uberblock.ub_version); 6226 6227 spa_config_exit(spa, SCL_STATE, FTAG); 6228 6229 nvlist_free(spa->spa_config_syncing); 6230 spa->spa_config_syncing = config; 6231 6232 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 6233 } 6234 6235 static void 6236 spa_sync_version(void *arg, dmu_tx_t *tx) 6237 { 6238 uint64_t *versionp = arg; 6239 uint64_t version = *versionp; 6240 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6241 6242 /* 6243 * Setting the version is special cased when first creating the pool. 6244 */ 6245 ASSERT(tx->tx_txg != TXG_INITIAL); 6246 6247 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 6248 ASSERT(version >= spa_version(spa)); 6249 6250 spa->spa_uberblock.ub_version = version; 6251 vdev_config_dirty(spa->spa_root_vdev); 6252 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 6253 } 6254 6255 /* 6256 * Set zpool properties. 6257 */ 6258 static void 6259 spa_sync_props(void *arg, dmu_tx_t *tx) 6260 { 6261 nvlist_t *nvp = arg; 6262 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6263 objset_t *mos = spa->spa_meta_objset; 6264 nvpair_t *elem = NULL; 6265 6266 mutex_enter(&spa->spa_props_lock); 6267 6268 while ((elem = nvlist_next_nvpair(nvp, elem))) { 6269 uint64_t intval; 6270 char *strval, *fname; 6271 zpool_prop_t prop; 6272 const char *propname; 6273 zprop_type_t proptype; 6274 spa_feature_t fid; 6275 6276 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 6277 case ZPROP_INVAL: 6278 /* 6279 * We checked this earlier in spa_prop_validate(). 6280 */ 6281 ASSERT(zpool_prop_feature(nvpair_name(elem))); 6282 6283 fname = strchr(nvpair_name(elem), '@') + 1; 6284 VERIFY0(zfeature_lookup_name(fname, &fid)); 6285 6286 spa_feature_enable(spa, fid, tx); 6287 spa_history_log_internal(spa, "set", tx, 6288 "%s=enabled", nvpair_name(elem)); 6289 break; 6290 6291 case ZPOOL_PROP_VERSION: 6292 intval = fnvpair_value_uint64(elem); 6293 /* 6294 * The version is synced seperatly before other 6295 * properties and should be correct by now. 6296 */ 6297 ASSERT3U(spa_version(spa), >=, intval); 6298 break; 6299 6300 case ZPOOL_PROP_ALTROOT: 6301 /* 6302 * 'altroot' is a non-persistent property. It should 6303 * have been set temporarily at creation or import time. 6304 */ 6305 ASSERT(spa->spa_root != NULL); 6306 break; 6307 6308 case ZPOOL_PROP_READONLY: 6309 case ZPOOL_PROP_CACHEFILE: 6310 /* 6311 * 'readonly' and 'cachefile' are also non-persisitent 6312 * properties. 6313 */ 6314 break; 6315 case ZPOOL_PROP_COMMENT: 6316 strval = fnvpair_value_string(elem); 6317 if (spa->spa_comment != NULL) 6318 spa_strfree(spa->spa_comment); 6319 spa->spa_comment = spa_strdup(strval); 6320 /* 6321 * We need to dirty the configuration on all the vdevs 6322 * so that their labels get updated. It's unnecessary 6323 * to do this for pool creation since the vdev's 6324 * configuratoin has already been dirtied. 6325 */ 6326 if (tx->tx_txg != TXG_INITIAL) 6327 vdev_config_dirty(spa->spa_root_vdev); 6328 spa_history_log_internal(spa, "set", tx, 6329 "%s=%s", nvpair_name(elem), strval); 6330 break; 6331 default: 6332 /* 6333 * Set pool property values in the poolprops mos object. 6334 */ 6335 if (spa->spa_pool_props_object == 0) { 6336 spa->spa_pool_props_object = 6337 zap_create_link(mos, DMU_OT_POOL_PROPS, 6338 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 6339 tx); 6340 } 6341 6342 /* normalize the property name */ 6343 propname = zpool_prop_to_name(prop); 6344 proptype = zpool_prop_get_type(prop); 6345 6346 if (nvpair_type(elem) == DATA_TYPE_STRING) { 6347 ASSERT(proptype == PROP_TYPE_STRING); 6348 strval = fnvpair_value_string(elem); 6349 VERIFY0(zap_update(mos, 6350 spa->spa_pool_props_object, propname, 6351 1, strlen(strval) + 1, strval, tx)); 6352 spa_history_log_internal(spa, "set", tx, 6353 "%s=%s", nvpair_name(elem), strval); 6354 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 6355 intval = fnvpair_value_uint64(elem); 6356 6357 if (proptype == PROP_TYPE_INDEX) { 6358 const char *unused; 6359 VERIFY0(zpool_prop_index_to_string( 6360 prop, intval, &unused)); 6361 } 6362 VERIFY0(zap_update(mos, 6363 spa->spa_pool_props_object, propname, 6364 8, 1, &intval, tx)); 6365 spa_history_log_internal(spa, "set", tx, 6366 "%s=%lld", nvpair_name(elem), intval); 6367 } else { 6368 ASSERT(0); /* not allowed */ 6369 } 6370 6371 switch (prop) { 6372 case ZPOOL_PROP_DELEGATION: 6373 spa->spa_delegation = intval; 6374 break; 6375 case ZPOOL_PROP_BOOTFS: 6376 spa->spa_bootfs = intval; 6377 break; 6378 case ZPOOL_PROP_FAILUREMODE: 6379 spa->spa_failmode = intval; 6380 break; 6381 case ZPOOL_PROP_AUTOEXPAND: 6382 spa->spa_autoexpand = intval; 6383 if (tx->tx_txg != TXG_INITIAL) 6384 spa_async_request(spa, 6385 SPA_ASYNC_AUTOEXPAND); 6386 break; 6387 case ZPOOL_PROP_DEDUPDITTO: 6388 spa->spa_dedup_ditto = intval; 6389 break; 6390 default: 6391 break; 6392 } 6393 } 6394 6395 } 6396 6397 mutex_exit(&spa->spa_props_lock); 6398 } 6399 6400 /* 6401 * Perform one-time upgrade on-disk changes. spa_version() does not 6402 * reflect the new version this txg, so there must be no changes this 6403 * txg to anything that the upgrade code depends on after it executes. 6404 * Therefore this must be called after dsl_pool_sync() does the sync 6405 * tasks. 6406 */ 6407 static void 6408 spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 6409 { 6410 dsl_pool_t *dp = spa->spa_dsl_pool; 6411 6412 ASSERT(spa->spa_sync_pass == 1); 6413 6414 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 6415 6416 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 6417 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 6418 dsl_pool_create_origin(dp, tx); 6419 6420 /* Keeping the origin open increases spa_minref */ 6421 spa->spa_minref += 3; 6422 } 6423 6424 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 6425 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 6426 dsl_pool_upgrade_clones(dp, tx); 6427 } 6428 6429 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 6430 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 6431 dsl_pool_upgrade_dir_clones(dp, tx); 6432 6433 /* Keeping the freedir open increases spa_minref */ 6434 spa->spa_minref += 3; 6435 } 6436 6437 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 6438 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6439 spa_feature_create_zap_objects(spa, tx); 6440 } 6441 6442 /* 6443 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 6444 * when possibility to use lz4 compression for metadata was added 6445 * Old pools that have this feature enabled must be upgraded to have 6446 * this feature active 6447 */ 6448 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6449 boolean_t lz4_en = spa_feature_is_enabled(spa, 6450 SPA_FEATURE_LZ4_COMPRESS); 6451 boolean_t lz4_ac = spa_feature_is_active(spa, 6452 SPA_FEATURE_LZ4_COMPRESS); 6453 6454 if (lz4_en && !lz4_ac) 6455 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 6456 } 6457 6458 /* 6459 * If we haven't written the salt, do so now. Note that the 6460 * feature may not be activated yet, but that's fine since 6461 * the presence of this ZAP entry is backwards compatible. 6462 */ 6463 if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 6464 DMU_POOL_CHECKSUM_SALT) == ENOENT) { 6465 VERIFY0(zap_add(spa->spa_meta_objset, 6466 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, 6467 sizeof (spa->spa_cksum_salt.zcs_bytes), 6468 spa->spa_cksum_salt.zcs_bytes, tx)); 6469 } 6470 6471 rrw_exit(&dp->dp_config_rwlock, FTAG); 6472 } 6473 6474 /* 6475 * Sync the specified transaction group. New blocks may be dirtied as 6476 * part of the process, so we iterate until it converges. 6477 */ 6478 void 6479 spa_sync(spa_t *spa, uint64_t txg) 6480 { 6481 dsl_pool_t *dp = spa->spa_dsl_pool; 6482 objset_t *mos = spa->spa_meta_objset; 6483 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 6484 vdev_t *rvd = spa->spa_root_vdev; 6485 vdev_t *vd; 6486 dmu_tx_t *tx; 6487 int error; 6488 6489 VERIFY(spa_writeable(spa)); 6490 6491 /* 6492 * Lock out configuration changes. 6493 */ 6494 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6495 6496 spa->spa_syncing_txg = txg; 6497 spa->spa_sync_pass = 0; 6498 6499 /* 6500 * If there are any pending vdev state changes, convert them 6501 * into config changes that go out with this transaction group. 6502 */ 6503 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6504 while (list_head(&spa->spa_state_dirty_list) != NULL) { 6505 /* 6506 * We need the write lock here because, for aux vdevs, 6507 * calling vdev_config_dirty() modifies sav_config. 6508 * This is ugly and will become unnecessary when we 6509 * eliminate the aux vdev wart by integrating all vdevs 6510 * into the root vdev tree. 6511 */ 6512 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6513 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 6514 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 6515 vdev_state_clean(vd); 6516 vdev_config_dirty(vd); 6517 } 6518 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6519 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 6520 } 6521 spa_config_exit(spa, SCL_STATE, FTAG); 6522 6523 tx = dmu_tx_create_assigned(dp, txg); 6524 6525 spa->spa_sync_starttime = gethrtime(); 6526 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 6527 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 6528 6529 /* 6530 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 6531 * set spa_deflate if we have no raid-z vdevs. 6532 */ 6533 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 6534 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 6535 int i; 6536 6537 for (i = 0; i < rvd->vdev_children; i++) { 6538 vd = rvd->vdev_child[i]; 6539 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 6540 break; 6541 } 6542 if (i == rvd->vdev_children) { 6543 spa->spa_deflate = TRUE; 6544 VERIFY(0 == zap_add(spa->spa_meta_objset, 6545 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 6546 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 6547 } 6548 } 6549 6550 /* 6551 * Iterate to convergence. 6552 */ 6553 do { 6554 int pass = ++spa->spa_sync_pass; 6555 6556 spa_sync_config_object(spa, tx); 6557 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 6558 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 6559 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 6560 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 6561 spa_errlog_sync(spa, txg); 6562 dsl_pool_sync(dp, txg); 6563 6564 if (pass < zfs_sync_pass_deferred_free) { 6565 spa_sync_frees(spa, free_bpl, tx); 6566 } else { 6567 /* 6568 * We can not defer frees in pass 1, because 6569 * we sync the deferred frees later in pass 1. 6570 */ 6571 ASSERT3U(pass, >, 1); 6572 bplist_iterate(free_bpl, bpobj_enqueue_cb, 6573 &spa->spa_deferred_bpobj, tx); 6574 } 6575 6576 ddt_sync(spa, txg); 6577 dsl_scan_sync(dp, tx); 6578 6579 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 6580 vdev_sync(vd, txg); 6581 6582 if (pass == 1) { 6583 spa_sync_upgrades(spa, tx); 6584 ASSERT3U(txg, >=, 6585 spa->spa_uberblock.ub_rootbp.blk_birth); 6586 /* 6587 * Note: We need to check if the MOS is dirty 6588 * because we could have marked the MOS dirty 6589 * without updating the uberblock (e.g. if we 6590 * have sync tasks but no dirty user data). We 6591 * need to check the uberblock's rootbp because 6592 * it is updated if we have synced out dirty 6593 * data (though in this case the MOS will most 6594 * likely also be dirty due to second order 6595 * effects, we don't want to rely on that here). 6596 */ 6597 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 6598 !dmu_objset_is_dirty(mos, txg)) { 6599 /* 6600 * Nothing changed on the first pass, 6601 * therefore this TXG is a no-op. Avoid 6602 * syncing deferred frees, so that we 6603 * can keep this TXG as a no-op. 6604 */ 6605 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 6606 txg)); 6607 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6608 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 6609 break; 6610 } 6611 spa_sync_deferred_frees(spa, tx); 6612 } 6613 6614 } while (dmu_objset_is_dirty(mos, txg)); 6615 6616 if (!list_is_empty(&spa->spa_config_dirty_list)) { 6617 /* 6618 * Make sure that the number of ZAPs for all the vdevs matches 6619 * the number of ZAPs in the per-vdev ZAP list. This only gets 6620 * called if the config is dirty; otherwise there may be 6621 * outstanding AVZ operations that weren't completed in 6622 * spa_sync_config_object. 6623 */ 6624 uint64_t all_vdev_zap_entry_count; 6625 ASSERT0(zap_count(spa->spa_meta_objset, 6626 spa->spa_all_vdev_zaps, &all_vdev_zap_entry_count)); 6627 ASSERT3U(vdev_count_verify_zaps(spa->spa_root_vdev), ==, 6628 all_vdev_zap_entry_count); 6629 } 6630 6631 /* 6632 * Rewrite the vdev configuration (which includes the uberblock) 6633 * to commit the transaction group. 6634 * 6635 * If there are no dirty vdevs, we sync the uberblock to a few 6636 * random top-level vdevs that are known to be visible in the 6637 * config cache (see spa_vdev_add() for a complete description). 6638 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 6639 */ 6640 for (;;) { 6641 /* 6642 * We hold SCL_STATE to prevent vdev open/close/etc. 6643 * while we're attempting to write the vdev labels. 6644 */ 6645 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6646 6647 if (list_is_empty(&spa->spa_config_dirty_list)) { 6648 vdev_t *svd[SPA_DVAS_PER_BP]; 6649 int svdcount = 0; 6650 int children = rvd->vdev_children; 6651 int c0 = spa_get_random(children); 6652 6653 for (int c = 0; c < children; c++) { 6654 vd = rvd->vdev_child[(c0 + c) % children]; 6655 if (vd->vdev_ms_array == 0 || vd->vdev_islog) 6656 continue; 6657 svd[svdcount++] = vd; 6658 if (svdcount == SPA_DVAS_PER_BP) 6659 break; 6660 } 6661 error = vdev_config_sync(svd, svdcount, txg); 6662 } else { 6663 error = vdev_config_sync(rvd->vdev_child, 6664 rvd->vdev_children, txg); 6665 } 6666 6667 if (error == 0) 6668 spa->spa_last_synced_guid = rvd->vdev_guid; 6669 6670 spa_config_exit(spa, SCL_STATE, FTAG); 6671 6672 if (error == 0) 6673 break; 6674 zio_suspend(spa, NULL); 6675 zio_resume_wait(spa); 6676 } 6677 dmu_tx_commit(tx); 6678 6679 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 6680 6681 /* 6682 * Clear the dirty config list. 6683 */ 6684 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 6685 vdev_config_clean(vd); 6686 6687 /* 6688 * Now that the new config has synced transactionally, 6689 * let it become visible to the config cache. 6690 */ 6691 if (spa->spa_config_syncing != NULL) { 6692 spa_config_set(spa, spa->spa_config_syncing); 6693 spa->spa_config_txg = txg; 6694 spa->spa_config_syncing = NULL; 6695 } 6696 6697 spa->spa_ubsync = spa->spa_uberblock; 6698 6699 dsl_pool_sync_done(dp, txg); 6700 6701 /* 6702 * Update usable space statistics. 6703 */ 6704 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 6705 vdev_sync_done(vd, txg); 6706 6707 spa_update_dspace(spa); 6708 6709 /* 6710 * It had better be the case that we didn't dirty anything 6711 * since vdev_config_sync(). 6712 */ 6713 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 6714 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6715 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 6716 6717 spa->spa_sync_pass = 0; 6718 6719 spa_config_exit(spa, SCL_CONFIG, FTAG); 6720 6721 spa_handle_ignored_writes(spa); 6722 6723 /* 6724 * If any async tasks have been requested, kick them off. 6725 */ 6726 spa_async_dispatch(spa); 6727 } 6728 6729 /* 6730 * Sync all pools. We don't want to hold the namespace lock across these 6731 * operations, so we take a reference on the spa_t and drop the lock during the 6732 * sync. 6733 */ 6734 void 6735 spa_sync_allpools(void) 6736 { 6737 spa_t *spa = NULL; 6738 mutex_enter(&spa_namespace_lock); 6739 while ((spa = spa_next(spa)) != NULL) { 6740 if (spa_state(spa) != POOL_STATE_ACTIVE || 6741 !spa_writeable(spa) || spa_suspended(spa)) 6742 continue; 6743 spa_open_ref(spa, FTAG); 6744 mutex_exit(&spa_namespace_lock); 6745 txg_wait_synced(spa_get_dsl(spa), 0); 6746 mutex_enter(&spa_namespace_lock); 6747 spa_close(spa, FTAG); 6748 } 6749 mutex_exit(&spa_namespace_lock); 6750 } 6751 6752 /* 6753 * ========================================================================== 6754 * Miscellaneous routines 6755 * ========================================================================== 6756 */ 6757 6758 /* 6759 * Remove all pools in the system. 6760 */ 6761 void 6762 spa_evict_all(void) 6763 { 6764 spa_t *spa; 6765 6766 /* 6767 * Remove all cached state. All pools should be closed now, 6768 * so every spa in the AVL tree should be unreferenced. 6769 */ 6770 mutex_enter(&spa_namespace_lock); 6771 while ((spa = spa_next(NULL)) != NULL) { 6772 /* 6773 * Stop async tasks. The async thread may need to detach 6774 * a device that's been replaced, which requires grabbing 6775 * spa_namespace_lock, so we must drop it here. 6776 */ 6777 spa_open_ref(spa, FTAG); 6778 mutex_exit(&spa_namespace_lock); 6779 spa_async_suspend(spa); 6780 mutex_enter(&spa_namespace_lock); 6781 spa_close(spa, FTAG); 6782 6783 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 6784 spa_unload(spa); 6785 spa_deactivate(spa); 6786 } 6787 spa_remove(spa); 6788 } 6789 mutex_exit(&spa_namespace_lock); 6790 } 6791 6792 vdev_t * 6793 spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 6794 { 6795 vdev_t *vd; 6796 int i; 6797 6798 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 6799 return (vd); 6800 6801 if (aux) { 6802 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 6803 vd = spa->spa_l2cache.sav_vdevs[i]; 6804 if (vd->vdev_guid == guid) 6805 return (vd); 6806 } 6807 6808 for (i = 0; i < spa->spa_spares.sav_count; i++) { 6809 vd = spa->spa_spares.sav_vdevs[i]; 6810 if (vd->vdev_guid == guid) 6811 return (vd); 6812 } 6813 } 6814 6815 return (NULL); 6816 } 6817 6818 void 6819 spa_upgrade(spa_t *spa, uint64_t version) 6820 { 6821 ASSERT(spa_writeable(spa)); 6822 6823 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6824 6825 /* 6826 * This should only be called for a non-faulted pool, and since a 6827 * future version would result in an unopenable pool, this shouldn't be 6828 * possible. 6829 */ 6830 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 6831 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 6832 6833 spa->spa_uberblock.ub_version = version; 6834 vdev_config_dirty(spa->spa_root_vdev); 6835 6836 spa_config_exit(spa, SCL_ALL, FTAG); 6837 6838 txg_wait_synced(spa_get_dsl(spa), 0); 6839 } 6840 6841 boolean_t 6842 spa_has_spare(spa_t *spa, uint64_t guid) 6843 { 6844 int i; 6845 uint64_t spareguid; 6846 spa_aux_vdev_t *sav = &spa->spa_spares; 6847 6848 for (i = 0; i < sav->sav_count; i++) 6849 if (sav->sav_vdevs[i]->vdev_guid == guid) 6850 return (B_TRUE); 6851 6852 for (i = 0; i < sav->sav_npending; i++) { 6853 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 6854 &spareguid) == 0 && spareguid == guid) 6855 return (B_TRUE); 6856 } 6857 6858 return (B_FALSE); 6859 } 6860 6861 /* 6862 * Check if a pool has an active shared spare device. 6863 * Note: reference count of an active spare is 2, as a spare and as a replace 6864 */ 6865 static boolean_t 6866 spa_has_active_shared_spare(spa_t *spa) 6867 { 6868 int i, refcnt; 6869 uint64_t pool; 6870 spa_aux_vdev_t *sav = &spa->spa_spares; 6871 6872 for (i = 0; i < sav->sav_count; i++) { 6873 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 6874 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 6875 refcnt > 2) 6876 return (B_TRUE); 6877 } 6878 6879 return (B_FALSE); 6880 } 6881 6882 /* 6883 * Post a sysevent corresponding to the given event. The 'name' must be one of 6884 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 6885 * filled in from the spa and (optionally) the vdev. This doesn't do anything 6886 * in the userland libzpool, as we don't want consumers to misinterpret ztest 6887 * or zdb as real changes. 6888 */ 6889 void 6890 spa_event_notify(spa_t *spa, vdev_t *vd, const char *name) 6891 { 6892 #ifdef _KERNEL 6893 sysevent_t *ev; 6894 sysevent_attr_list_t *attr = NULL; 6895 sysevent_value_t value; 6896 sysevent_id_t eid; 6897 6898 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 6899 SE_SLEEP); 6900 6901 value.value_type = SE_DATA_TYPE_STRING; 6902 value.value.sv_string = spa_name(spa); 6903 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0) 6904 goto done; 6905 6906 value.value_type = SE_DATA_TYPE_UINT64; 6907 value.value.sv_uint64 = spa_guid(spa); 6908 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0) 6909 goto done; 6910 6911 if (vd) { 6912 value.value_type = SE_DATA_TYPE_UINT64; 6913 value.value.sv_uint64 = vd->vdev_guid; 6914 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value, 6915 SE_SLEEP) != 0) 6916 goto done; 6917 6918 if (vd->vdev_path) { 6919 value.value_type = SE_DATA_TYPE_STRING; 6920 value.value.sv_string = vd->vdev_path; 6921 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH, 6922 &value, SE_SLEEP) != 0) 6923 goto done; 6924 } 6925 } 6926 6927 if (sysevent_attach_attributes(ev, attr) != 0) 6928 goto done; 6929 attr = NULL; 6930 6931 (void) log_sysevent(ev, SE_SLEEP, &eid); 6932 6933 done: 6934 if (attr) 6935 sysevent_free_attr(attr); 6936 sysevent_free(ev); 6937 #endif 6938 } 6939