1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2018 by Delphix. All rights reserved. 25 * Copyright (c) 2015, Nexenta Systems, Inc. All rights reserved. 26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 27 * Copyright 2013 Saso Kiselkov. All rights reserved. 28 * Copyright (c) 2014 Integros [integros.com] 29 * Copyright 2016 Toomas Soome <tsoome@me.com> 30 * Copyright 2017 Joyent, Inc. 31 * Copyright (c) 2017 Datto Inc. 32 * Copyright 2018 OmniOS Community Edition (OmniOSce) Association. 33 */ 34 35 /* 36 * SPA: Storage Pool Allocator 37 * 38 * This file contains all the routines used when modifying on-disk SPA state. 39 * This includes opening, importing, destroying, exporting a pool, and syncing a 40 * pool. 41 */ 42 43 #include <sys/zfs_context.h> 44 #include <sys/fm/fs/zfs.h> 45 #include <sys/spa_impl.h> 46 #include <sys/zio.h> 47 #include <sys/zio_checksum.h> 48 #include <sys/dmu.h> 49 #include <sys/dmu_tx.h> 50 #include <sys/zap.h> 51 #include <sys/zil.h> 52 #include <sys/ddt.h> 53 #include <sys/vdev_impl.h> 54 #include <sys/vdev_removal.h> 55 #include <sys/vdev_indirect_mapping.h> 56 #include <sys/vdev_indirect_births.h> 57 #include <sys/metaslab.h> 58 #include <sys/metaslab_impl.h> 59 #include <sys/uberblock_impl.h> 60 #include <sys/txg.h> 61 #include <sys/avl.h> 62 #include <sys/bpobj.h> 63 #include <sys/dmu_traverse.h> 64 #include <sys/dmu_objset.h> 65 #include <sys/unique.h> 66 #include <sys/dsl_pool.h> 67 #include <sys/dsl_dataset.h> 68 #include <sys/dsl_dir.h> 69 #include <sys/dsl_prop.h> 70 #include <sys/dsl_synctask.h> 71 #include <sys/fs/zfs.h> 72 #include <sys/arc.h> 73 #include <sys/callb.h> 74 #include <sys/systeminfo.h> 75 #include <sys/spa_boot.h> 76 #include <sys/zfs_ioctl.h> 77 #include <sys/dsl_scan.h> 78 #include <sys/zfeature.h> 79 #include <sys/dsl_destroy.h> 80 #include <sys/abd.h> 81 82 #ifdef _KERNEL 83 #include <sys/bootprops.h> 84 #include <sys/callb.h> 85 #include <sys/cpupart.h> 86 #include <sys/pool.h> 87 #include <sys/sysdc.h> 88 #include <sys/zone.h> 89 #endif /* _KERNEL */ 90 91 #include "zfs_prop.h" 92 #include "zfs_comutil.h" 93 94 /* 95 * The interval, in seconds, at which failed configuration cache file writes 96 * should be retried. 97 */ 98 int zfs_ccw_retry_interval = 300; 99 100 typedef enum zti_modes { 101 ZTI_MODE_FIXED, /* value is # of threads (min 1) */ 102 ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ 103 ZTI_MODE_NULL, /* don't create a taskq */ 104 ZTI_NMODES 105 } zti_modes_t; 106 107 #define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } 108 #define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } 109 #define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } 110 111 #define ZTI_N(n) ZTI_P(n, 1) 112 #define ZTI_ONE ZTI_N(1) 113 114 typedef struct zio_taskq_info { 115 zti_modes_t zti_mode; 116 uint_t zti_value; 117 uint_t zti_count; 118 } zio_taskq_info_t; 119 120 static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { 121 "issue", "issue_high", "intr", "intr_high" 122 }; 123 124 /* 125 * This table defines the taskq settings for each ZFS I/O type. When 126 * initializing a pool, we use this table to create an appropriately sized 127 * taskq. Some operations are low volume and therefore have a small, static 128 * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE 129 * macros. Other operations process a large amount of data; the ZTI_BATCH 130 * macro causes us to create a taskq oriented for throughput. Some operations 131 * are so high frequency and short-lived that the taskq itself can become a a 132 * point of lock contention. The ZTI_P(#, #) macro indicates that we need an 133 * additional degree of parallelism specified by the number of threads per- 134 * taskq and the number of taskqs; when dispatching an event in this case, the 135 * particular taskq is chosen at random. 136 * 137 * The different taskq priorities are to handle the different contexts (issue 138 * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that 139 * need to be handled with minimum delay. 140 */ 141 const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { 142 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ 143 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ 144 { ZTI_N(8), ZTI_NULL, ZTI_P(12, 8), ZTI_NULL }, /* READ */ 145 { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ 146 { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ 147 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ 148 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ 149 }; 150 151 static void spa_sync_version(void *arg, dmu_tx_t *tx); 152 static void spa_sync_props(void *arg, dmu_tx_t *tx); 153 static boolean_t spa_has_active_shared_spare(spa_t *spa); 154 static int spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport); 155 static void spa_vdev_resilver_done(spa_t *spa); 156 157 uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 158 id_t zio_taskq_psrset_bind = PS_NONE; 159 boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 160 uint_t zio_taskq_basedc = 80; /* base duty cycle */ 161 162 boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 163 extern int zfs_sync_pass_deferred_free; 164 165 /* 166 * Report any spa_load_verify errors found, but do not fail spa_load. 167 * This is used by zdb to analyze non-idle pools. 168 */ 169 boolean_t spa_load_verify_dryrun = B_FALSE; 170 171 /* 172 * This (illegal) pool name is used when temporarily importing a spa_t in order 173 * to get the vdev stats associated with the imported devices. 174 */ 175 #define TRYIMPORT_NAME "$import" 176 177 /* 178 * For debugging purposes: print out vdev tree during pool import. 179 */ 180 boolean_t spa_load_print_vdev_tree = B_FALSE; 181 182 /* 183 * A non-zero value for zfs_max_missing_tvds means that we allow importing 184 * pools with missing top-level vdevs. This is strictly intended for advanced 185 * pool recovery cases since missing data is almost inevitable. Pools with 186 * missing devices can only be imported read-only for safety reasons, and their 187 * fail-mode will be automatically set to "continue". 188 * 189 * With 1 missing vdev we should be able to import the pool and mount all 190 * datasets. User data that was not modified after the missing device has been 191 * added should be recoverable. This means that snapshots created prior to the 192 * addition of that device should be completely intact. 193 * 194 * With 2 missing vdevs, some datasets may fail to mount since there are 195 * dataset statistics that are stored as regular metadata. Some data might be 196 * recoverable if those vdevs were added recently. 197 * 198 * With 3 or more missing vdevs, the pool is severely damaged and MOS entries 199 * may be missing entirely. Chances of data recovery are very low. Note that 200 * there are also risks of performing an inadvertent rewind as we might be 201 * missing all the vdevs with the latest uberblocks. 202 */ 203 uint64_t zfs_max_missing_tvds = 0; 204 205 /* 206 * The parameters below are similar to zfs_max_missing_tvds but are only 207 * intended for a preliminary open of the pool with an untrusted config which 208 * might be incomplete or out-dated. 209 * 210 * We are more tolerant for pools opened from a cachefile since we could have 211 * an out-dated cachefile where a device removal was not registered. 212 * We could have set the limit arbitrarily high but in the case where devices 213 * are really missing we would want to return the proper error codes; we chose 214 * SPA_DVAS_PER_BP - 1 so that some copies of the MOS would still be available 215 * and we get a chance to retrieve the trusted config. 216 */ 217 uint64_t zfs_max_missing_tvds_cachefile = SPA_DVAS_PER_BP - 1; 218 219 /* 220 * In the case where config was assembled by scanning device paths (/dev/dsks 221 * by default) we are less tolerant since all the existing devices should have 222 * been detected and we want spa_load to return the right error codes. 223 */ 224 uint64_t zfs_max_missing_tvds_scan = 0; 225 226 /* 227 * Debugging aid that pauses spa_sync() towards the end. 228 */ 229 boolean_t zfs_pause_spa_sync = B_FALSE; 230 231 /* 232 * ========================================================================== 233 * SPA properties routines 234 * ========================================================================== 235 */ 236 237 /* 238 * Add a (source=src, propname=propval) list to an nvlist. 239 */ 240 static void 241 spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 242 uint64_t intval, zprop_source_t src) 243 { 244 const char *propname = zpool_prop_to_name(prop); 245 nvlist_t *propval; 246 247 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 248 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 249 250 if (strval != NULL) 251 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 252 else 253 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 254 255 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 256 nvlist_free(propval); 257 } 258 259 /* 260 * Get property values from the spa configuration. 261 */ 262 static void 263 spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 264 { 265 vdev_t *rvd = spa->spa_root_vdev; 266 dsl_pool_t *pool = spa->spa_dsl_pool; 267 uint64_t size, alloc, cap, version; 268 zprop_source_t src = ZPROP_SRC_NONE; 269 spa_config_dirent_t *dp; 270 metaslab_class_t *mc = spa_normal_class(spa); 271 272 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 273 274 if (rvd != NULL) { 275 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 276 size = metaslab_class_get_space(spa_normal_class(spa)); 277 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 278 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 279 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 280 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 281 size - alloc, src); 282 spa_prop_add_list(*nvp, ZPOOL_PROP_CHECKPOINT, NULL, 283 spa->spa_checkpoint_info.sci_dspace, src); 284 285 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 286 metaslab_class_fragmentation(mc), src); 287 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 288 metaslab_class_expandable_space(mc), src); 289 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 290 (spa_mode(spa) == FREAD), src); 291 292 cap = (size == 0) ? 0 : (alloc * 100 / size); 293 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 294 295 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 296 ddt_get_pool_dedup_ratio(spa), src); 297 298 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 299 rvd->vdev_state, src); 300 301 version = spa_version(spa); 302 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 303 src = ZPROP_SRC_DEFAULT; 304 else 305 src = ZPROP_SRC_LOCAL; 306 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 307 } 308 309 if (pool != NULL) { 310 /* 311 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 312 * when opening pools before this version freedir will be NULL. 313 */ 314 if (pool->dp_free_dir != NULL) { 315 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 316 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 317 src); 318 } else { 319 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 320 NULL, 0, src); 321 } 322 323 if (pool->dp_leak_dir != NULL) { 324 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 325 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 326 src); 327 } else { 328 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 329 NULL, 0, src); 330 } 331 } 332 333 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 334 335 if (spa->spa_comment != NULL) { 336 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 337 0, ZPROP_SRC_LOCAL); 338 } 339 340 if (spa->spa_root != NULL) 341 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 342 0, ZPROP_SRC_LOCAL); 343 344 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 345 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 346 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 347 } else { 348 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 349 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 350 } 351 352 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 353 if (dp->scd_path == NULL) { 354 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 355 "none", 0, ZPROP_SRC_LOCAL); 356 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 357 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 358 dp->scd_path, 0, ZPROP_SRC_LOCAL); 359 } 360 } 361 } 362 363 /* 364 * Get zpool property values. 365 */ 366 int 367 spa_prop_get(spa_t *spa, nvlist_t **nvp) 368 { 369 objset_t *mos = spa->spa_meta_objset; 370 zap_cursor_t zc; 371 zap_attribute_t za; 372 int err; 373 374 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 375 376 mutex_enter(&spa->spa_props_lock); 377 378 /* 379 * Get properties from the spa config. 380 */ 381 spa_prop_get_config(spa, nvp); 382 383 /* If no pool property object, no more prop to get. */ 384 if (mos == NULL || spa->spa_pool_props_object == 0) { 385 mutex_exit(&spa->spa_props_lock); 386 return (0); 387 } 388 389 /* 390 * Get properties from the MOS pool property object. 391 */ 392 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 393 (err = zap_cursor_retrieve(&zc, &za)) == 0; 394 zap_cursor_advance(&zc)) { 395 uint64_t intval = 0; 396 char *strval = NULL; 397 zprop_source_t src = ZPROP_SRC_DEFAULT; 398 zpool_prop_t prop; 399 400 if ((prop = zpool_name_to_prop(za.za_name)) == ZPOOL_PROP_INVAL) 401 continue; 402 403 switch (za.za_integer_length) { 404 case 8: 405 /* integer property */ 406 if (za.za_first_integer != 407 zpool_prop_default_numeric(prop)) 408 src = ZPROP_SRC_LOCAL; 409 410 if (prop == ZPOOL_PROP_BOOTFS) { 411 dsl_pool_t *dp; 412 dsl_dataset_t *ds = NULL; 413 414 dp = spa_get_dsl(spa); 415 dsl_pool_config_enter(dp, FTAG); 416 if (err = dsl_dataset_hold_obj(dp, 417 za.za_first_integer, FTAG, &ds)) { 418 dsl_pool_config_exit(dp, FTAG); 419 break; 420 } 421 422 strval = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, 423 KM_SLEEP); 424 dsl_dataset_name(ds, strval); 425 dsl_dataset_rele(ds, FTAG); 426 dsl_pool_config_exit(dp, FTAG); 427 } else { 428 strval = NULL; 429 intval = za.za_first_integer; 430 } 431 432 spa_prop_add_list(*nvp, prop, strval, intval, src); 433 434 if (strval != NULL) 435 kmem_free(strval, ZFS_MAX_DATASET_NAME_LEN); 436 437 break; 438 439 case 1: 440 /* string property */ 441 strval = kmem_alloc(za.za_num_integers, KM_SLEEP); 442 err = zap_lookup(mos, spa->spa_pool_props_object, 443 za.za_name, 1, za.za_num_integers, strval); 444 if (err) { 445 kmem_free(strval, za.za_num_integers); 446 break; 447 } 448 spa_prop_add_list(*nvp, prop, strval, 0, src); 449 kmem_free(strval, za.za_num_integers); 450 break; 451 452 default: 453 break; 454 } 455 } 456 zap_cursor_fini(&zc); 457 mutex_exit(&spa->spa_props_lock); 458 out: 459 if (err && err != ENOENT) { 460 nvlist_free(*nvp); 461 *nvp = NULL; 462 return (err); 463 } 464 465 return (0); 466 } 467 468 /* 469 * Validate the given pool properties nvlist and modify the list 470 * for the property values to be set. 471 */ 472 static int 473 spa_prop_validate(spa_t *spa, nvlist_t *props) 474 { 475 nvpair_t *elem; 476 int error = 0, reset_bootfs = 0; 477 uint64_t objnum = 0; 478 boolean_t has_feature = B_FALSE; 479 480 elem = NULL; 481 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { 482 uint64_t intval; 483 char *strval, *slash, *check, *fname; 484 const char *propname = nvpair_name(elem); 485 zpool_prop_t prop = zpool_name_to_prop(propname); 486 487 switch (prop) { 488 case ZPOOL_PROP_INVAL: 489 if (!zpool_prop_feature(propname)) { 490 error = SET_ERROR(EINVAL); 491 break; 492 } 493 494 /* 495 * Sanitize the input. 496 */ 497 if (nvpair_type(elem) != DATA_TYPE_UINT64) { 498 error = SET_ERROR(EINVAL); 499 break; 500 } 501 502 if (nvpair_value_uint64(elem, &intval) != 0) { 503 error = SET_ERROR(EINVAL); 504 break; 505 } 506 507 if (intval != 0) { 508 error = SET_ERROR(EINVAL); 509 break; 510 } 511 512 fname = strchr(propname, '@') + 1; 513 if (zfeature_lookup_name(fname, NULL) != 0) { 514 error = SET_ERROR(EINVAL); 515 break; 516 } 517 518 has_feature = B_TRUE; 519 break; 520 521 case ZPOOL_PROP_VERSION: 522 error = nvpair_value_uint64(elem, &intval); 523 if (!error && 524 (intval < spa_version(spa) || 525 intval > SPA_VERSION_BEFORE_FEATURES || 526 has_feature)) 527 error = SET_ERROR(EINVAL); 528 break; 529 530 case ZPOOL_PROP_DELEGATION: 531 case ZPOOL_PROP_AUTOREPLACE: 532 case ZPOOL_PROP_LISTSNAPS: 533 case ZPOOL_PROP_AUTOEXPAND: 534 error = nvpair_value_uint64(elem, &intval); 535 if (!error && intval > 1) 536 error = SET_ERROR(EINVAL); 537 break; 538 539 case ZPOOL_PROP_BOOTFS: 540 /* 541 * If the pool version is less than SPA_VERSION_BOOTFS, 542 * or the pool is still being created (version == 0), 543 * the bootfs property cannot be set. 544 */ 545 if (spa_version(spa) < SPA_VERSION_BOOTFS) { 546 error = SET_ERROR(ENOTSUP); 547 break; 548 } 549 550 /* 551 * Make sure the vdev config is bootable 552 */ 553 if (!vdev_is_bootable(spa->spa_root_vdev)) { 554 error = SET_ERROR(ENOTSUP); 555 break; 556 } 557 558 reset_bootfs = 1; 559 560 error = nvpair_value_string(elem, &strval); 561 562 if (!error) { 563 objset_t *os; 564 uint64_t propval; 565 566 if (strval == NULL || strval[0] == '\0') { 567 objnum = zpool_prop_default_numeric( 568 ZPOOL_PROP_BOOTFS); 569 break; 570 } 571 572 if (error = dmu_objset_hold(strval, FTAG, &os)) 573 break; 574 575 /* 576 * Must be ZPL, and its property settings 577 * must be supported by GRUB (compression 578 * is not gzip, and large blocks are not used). 579 */ 580 581 if (dmu_objset_type(os) != DMU_OST_ZFS) { 582 error = SET_ERROR(ENOTSUP); 583 } else if ((error = 584 dsl_prop_get_int_ds(dmu_objset_ds(os), 585 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 586 &propval)) == 0 && 587 !BOOTFS_COMPRESS_VALID(propval)) { 588 error = SET_ERROR(ENOTSUP); 589 } else { 590 objnum = dmu_objset_id(os); 591 } 592 dmu_objset_rele(os, FTAG); 593 } 594 break; 595 596 case ZPOOL_PROP_FAILUREMODE: 597 error = nvpair_value_uint64(elem, &intval); 598 if (!error && (intval < ZIO_FAILURE_MODE_WAIT || 599 intval > ZIO_FAILURE_MODE_PANIC)) 600 error = SET_ERROR(EINVAL); 601 602 /* 603 * This is a special case which only occurs when 604 * the pool has completely failed. This allows 605 * the user to change the in-core failmode property 606 * without syncing it out to disk (I/Os might 607 * currently be blocked). We do this by returning 608 * EIO to the caller (spa_prop_set) to trick it 609 * into thinking we encountered a property validation 610 * error. 611 */ 612 if (!error && spa_suspended(spa)) { 613 spa->spa_failmode = intval; 614 error = SET_ERROR(EIO); 615 } 616 break; 617 618 case ZPOOL_PROP_CACHEFILE: 619 if ((error = nvpair_value_string(elem, &strval)) != 0) 620 break; 621 622 if (strval[0] == '\0') 623 break; 624 625 if (strcmp(strval, "none") == 0) 626 break; 627 628 if (strval[0] != '/') { 629 error = SET_ERROR(EINVAL); 630 break; 631 } 632 633 slash = strrchr(strval, '/'); 634 ASSERT(slash != NULL); 635 636 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || 637 strcmp(slash, "/..") == 0) 638 error = SET_ERROR(EINVAL); 639 break; 640 641 case ZPOOL_PROP_COMMENT: 642 if ((error = nvpair_value_string(elem, &strval)) != 0) 643 break; 644 for (check = strval; *check != '\0'; check++) { 645 /* 646 * The kernel doesn't have an easy isprint() 647 * check. For this kernel check, we merely 648 * check ASCII apart from DEL. Fix this if 649 * there is an easy-to-use kernel isprint(). 650 */ 651 if (*check >= 0x7f) { 652 error = SET_ERROR(EINVAL); 653 break; 654 } 655 } 656 if (strlen(strval) > ZPROP_MAX_COMMENT) 657 error = E2BIG; 658 break; 659 660 case ZPOOL_PROP_DEDUPDITTO: 661 if (spa_version(spa) < SPA_VERSION_DEDUP) 662 error = SET_ERROR(ENOTSUP); 663 else 664 error = nvpair_value_uint64(elem, &intval); 665 if (error == 0 && 666 intval != 0 && intval < ZIO_DEDUPDITTO_MIN) 667 error = SET_ERROR(EINVAL); 668 break; 669 } 670 671 if (error) 672 break; 673 } 674 675 if (!error && reset_bootfs) { 676 error = nvlist_remove(props, 677 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); 678 679 if (!error) { 680 error = nvlist_add_uint64(props, 681 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); 682 } 683 } 684 685 return (error); 686 } 687 688 void 689 spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) 690 { 691 char *cachefile; 692 spa_config_dirent_t *dp; 693 694 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), 695 &cachefile) != 0) 696 return; 697 698 dp = kmem_alloc(sizeof (spa_config_dirent_t), 699 KM_SLEEP); 700 701 if (cachefile[0] == '\0') 702 dp->scd_path = spa_strdup(spa_config_path); 703 else if (strcmp(cachefile, "none") == 0) 704 dp->scd_path = NULL; 705 else 706 dp->scd_path = spa_strdup(cachefile); 707 708 list_insert_head(&spa->spa_config_list, dp); 709 if (need_sync) 710 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 711 } 712 713 int 714 spa_prop_set(spa_t *spa, nvlist_t *nvp) 715 { 716 int error; 717 nvpair_t *elem = NULL; 718 boolean_t need_sync = B_FALSE; 719 720 if ((error = spa_prop_validate(spa, nvp)) != 0) 721 return (error); 722 723 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { 724 zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); 725 726 if (prop == ZPOOL_PROP_CACHEFILE || 727 prop == ZPOOL_PROP_ALTROOT || 728 prop == ZPOOL_PROP_READONLY) 729 continue; 730 731 if (prop == ZPOOL_PROP_VERSION || prop == ZPOOL_PROP_INVAL) { 732 uint64_t ver; 733 734 if (prop == ZPOOL_PROP_VERSION) { 735 VERIFY(nvpair_value_uint64(elem, &ver) == 0); 736 } else { 737 ASSERT(zpool_prop_feature(nvpair_name(elem))); 738 ver = SPA_VERSION_FEATURES; 739 need_sync = B_TRUE; 740 } 741 742 /* Save time if the version is already set. */ 743 if (ver == spa_version(spa)) 744 continue; 745 746 /* 747 * In addition to the pool directory object, we might 748 * create the pool properties object, the features for 749 * read object, the features for write object, or the 750 * feature descriptions object. 751 */ 752 error = dsl_sync_task(spa->spa_name, NULL, 753 spa_sync_version, &ver, 754 6, ZFS_SPACE_CHECK_RESERVED); 755 if (error) 756 return (error); 757 continue; 758 } 759 760 need_sync = B_TRUE; 761 break; 762 } 763 764 if (need_sync) { 765 return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, 766 nvp, 6, ZFS_SPACE_CHECK_RESERVED)); 767 } 768 769 return (0); 770 } 771 772 /* 773 * If the bootfs property value is dsobj, clear it. 774 */ 775 void 776 spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) 777 { 778 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { 779 VERIFY(zap_remove(spa->spa_meta_objset, 780 spa->spa_pool_props_object, 781 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); 782 spa->spa_bootfs = 0; 783 } 784 } 785 786 /*ARGSUSED*/ 787 static int 788 spa_change_guid_check(void *arg, dmu_tx_t *tx) 789 { 790 uint64_t *newguid = arg; 791 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 792 vdev_t *rvd = spa->spa_root_vdev; 793 uint64_t vdev_state; 794 795 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 796 int error = (spa_has_checkpoint(spa)) ? 797 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 798 return (SET_ERROR(error)); 799 } 800 801 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 802 vdev_state = rvd->vdev_state; 803 spa_config_exit(spa, SCL_STATE, FTAG); 804 805 if (vdev_state != VDEV_STATE_HEALTHY) 806 return (SET_ERROR(ENXIO)); 807 808 ASSERT3U(spa_guid(spa), !=, *newguid); 809 810 return (0); 811 } 812 813 static void 814 spa_change_guid_sync(void *arg, dmu_tx_t *tx) 815 { 816 uint64_t *newguid = arg; 817 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 818 uint64_t oldguid; 819 vdev_t *rvd = spa->spa_root_vdev; 820 821 oldguid = spa_guid(spa); 822 823 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 824 rvd->vdev_guid = *newguid; 825 rvd->vdev_guid_sum += (*newguid - oldguid); 826 vdev_config_dirty(rvd); 827 spa_config_exit(spa, SCL_STATE, FTAG); 828 829 spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", 830 oldguid, *newguid); 831 } 832 833 /* 834 * Change the GUID for the pool. This is done so that we can later 835 * re-import a pool built from a clone of our own vdevs. We will modify 836 * the root vdev's guid, our own pool guid, and then mark all of our 837 * vdevs dirty. Note that we must make sure that all our vdevs are 838 * online when we do this, or else any vdevs that weren't present 839 * would be orphaned from our pool. We are also going to issue a 840 * sysevent to update any watchers. 841 */ 842 int 843 spa_change_guid(spa_t *spa) 844 { 845 int error; 846 uint64_t guid; 847 848 mutex_enter(&spa->spa_vdev_top_lock); 849 mutex_enter(&spa_namespace_lock); 850 guid = spa_generate_guid(NULL); 851 852 error = dsl_sync_task(spa->spa_name, spa_change_guid_check, 853 spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); 854 855 if (error == 0) { 856 spa_write_cachefile(spa, B_FALSE, B_TRUE); 857 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_REGUID); 858 } 859 860 mutex_exit(&spa_namespace_lock); 861 mutex_exit(&spa->spa_vdev_top_lock); 862 863 return (error); 864 } 865 866 /* 867 * ========================================================================== 868 * SPA state manipulation (open/create/destroy/import/export) 869 * ========================================================================== 870 */ 871 872 static int 873 spa_error_entry_compare(const void *a, const void *b) 874 { 875 spa_error_entry_t *sa = (spa_error_entry_t *)a; 876 spa_error_entry_t *sb = (spa_error_entry_t *)b; 877 int ret; 878 879 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark, 880 sizeof (zbookmark_phys_t)); 881 882 if (ret < 0) 883 return (-1); 884 else if (ret > 0) 885 return (1); 886 else 887 return (0); 888 } 889 890 /* 891 * Utility function which retrieves copies of the current logs and 892 * re-initializes them in the process. 893 */ 894 void 895 spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) 896 { 897 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); 898 899 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); 900 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); 901 902 avl_create(&spa->spa_errlist_scrub, 903 spa_error_entry_compare, sizeof (spa_error_entry_t), 904 offsetof(spa_error_entry_t, se_avl)); 905 avl_create(&spa->spa_errlist_last, 906 spa_error_entry_compare, sizeof (spa_error_entry_t), 907 offsetof(spa_error_entry_t, se_avl)); 908 } 909 910 static void 911 spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 912 { 913 const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; 914 enum zti_modes mode = ztip->zti_mode; 915 uint_t value = ztip->zti_value; 916 uint_t count = ztip->zti_count; 917 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 918 char name[32]; 919 uint_t flags = 0; 920 boolean_t batch = B_FALSE; 921 922 if (mode == ZTI_MODE_NULL) { 923 tqs->stqs_count = 0; 924 tqs->stqs_taskq = NULL; 925 return; 926 } 927 928 ASSERT3U(count, >, 0); 929 930 tqs->stqs_count = count; 931 tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); 932 933 switch (mode) { 934 case ZTI_MODE_FIXED: 935 ASSERT3U(value, >=, 1); 936 value = MAX(value, 1); 937 break; 938 939 case ZTI_MODE_BATCH: 940 batch = B_TRUE; 941 flags |= TASKQ_THREADS_CPU_PCT; 942 value = zio_taskq_batch_pct; 943 break; 944 945 default: 946 panic("unrecognized mode for %s_%s taskq (%u:%u) in " 947 "spa_activate()", 948 zio_type_name[t], zio_taskq_types[q], mode, value); 949 break; 950 } 951 952 for (uint_t i = 0; i < count; i++) { 953 taskq_t *tq; 954 955 if (count > 1) { 956 (void) snprintf(name, sizeof (name), "%s_%s_%u", 957 zio_type_name[t], zio_taskq_types[q], i); 958 } else { 959 (void) snprintf(name, sizeof (name), "%s_%s", 960 zio_type_name[t], zio_taskq_types[q]); 961 } 962 963 if (zio_taskq_sysdc && spa->spa_proc != &p0) { 964 if (batch) 965 flags |= TASKQ_DC_BATCH; 966 967 tq = taskq_create_sysdc(name, value, 50, INT_MAX, 968 spa->spa_proc, zio_taskq_basedc, flags); 969 } else { 970 pri_t pri = maxclsyspri; 971 /* 972 * The write issue taskq can be extremely CPU 973 * intensive. Run it at slightly lower priority 974 * than the other taskqs. 975 */ 976 if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) 977 pri--; 978 979 tq = taskq_create_proc(name, value, pri, 50, 980 INT_MAX, spa->spa_proc, flags); 981 } 982 983 tqs->stqs_taskq[i] = tq; 984 } 985 } 986 987 static void 988 spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 989 { 990 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 991 992 if (tqs->stqs_taskq == NULL) { 993 ASSERT0(tqs->stqs_count); 994 return; 995 } 996 997 for (uint_t i = 0; i < tqs->stqs_count; i++) { 998 ASSERT3P(tqs->stqs_taskq[i], !=, NULL); 999 taskq_destroy(tqs->stqs_taskq[i]); 1000 } 1001 1002 kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); 1003 tqs->stqs_taskq = NULL; 1004 } 1005 1006 /* 1007 * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. 1008 * Note that a type may have multiple discrete taskqs to avoid lock contention 1009 * on the taskq itself. In that case we choose which taskq at random by using 1010 * the low bits of gethrtime(). 1011 */ 1012 void 1013 spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, 1014 task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) 1015 { 1016 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1017 taskq_t *tq; 1018 1019 ASSERT3P(tqs->stqs_taskq, !=, NULL); 1020 ASSERT3U(tqs->stqs_count, !=, 0); 1021 1022 if (tqs->stqs_count == 1) { 1023 tq = tqs->stqs_taskq[0]; 1024 } else { 1025 tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; 1026 } 1027 1028 taskq_dispatch_ent(tq, func, arg, flags, ent); 1029 } 1030 1031 static void 1032 spa_create_zio_taskqs(spa_t *spa) 1033 { 1034 for (int t = 0; t < ZIO_TYPES; t++) { 1035 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1036 spa_taskqs_init(spa, t, q); 1037 } 1038 } 1039 } 1040 1041 #ifdef _KERNEL 1042 static void 1043 spa_thread(void *arg) 1044 { 1045 callb_cpr_t cprinfo; 1046 1047 spa_t *spa = arg; 1048 user_t *pu = PTOU(curproc); 1049 1050 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, 1051 spa->spa_name); 1052 1053 ASSERT(curproc != &p0); 1054 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), 1055 "zpool-%s", spa->spa_name); 1056 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); 1057 1058 /* bind this thread to the requested psrset */ 1059 if (zio_taskq_psrset_bind != PS_NONE) { 1060 pool_lock(); 1061 mutex_enter(&cpu_lock); 1062 mutex_enter(&pidlock); 1063 mutex_enter(&curproc->p_lock); 1064 1065 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, 1066 0, NULL, NULL) == 0) { 1067 curthread->t_bind_pset = zio_taskq_psrset_bind; 1068 } else { 1069 cmn_err(CE_WARN, 1070 "Couldn't bind process for zfs pool \"%s\" to " 1071 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); 1072 } 1073 1074 mutex_exit(&curproc->p_lock); 1075 mutex_exit(&pidlock); 1076 mutex_exit(&cpu_lock); 1077 pool_unlock(); 1078 } 1079 1080 if (zio_taskq_sysdc) { 1081 sysdc_thread_enter(curthread, 100, 0); 1082 } 1083 1084 spa->spa_proc = curproc; 1085 spa->spa_did = curthread->t_did; 1086 1087 spa_create_zio_taskqs(spa); 1088 1089 mutex_enter(&spa->spa_proc_lock); 1090 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); 1091 1092 spa->spa_proc_state = SPA_PROC_ACTIVE; 1093 cv_broadcast(&spa->spa_proc_cv); 1094 1095 CALLB_CPR_SAFE_BEGIN(&cprinfo); 1096 while (spa->spa_proc_state == SPA_PROC_ACTIVE) 1097 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1098 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); 1099 1100 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); 1101 spa->spa_proc_state = SPA_PROC_GONE; 1102 spa->spa_proc = &p0; 1103 cv_broadcast(&spa->spa_proc_cv); 1104 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ 1105 1106 mutex_enter(&curproc->p_lock); 1107 lwp_exit(); 1108 } 1109 #endif 1110 1111 /* 1112 * Activate an uninitialized pool. 1113 */ 1114 static void 1115 spa_activate(spa_t *spa, int mode) 1116 { 1117 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 1118 1119 spa->spa_state = POOL_STATE_ACTIVE; 1120 spa->spa_mode = mode; 1121 1122 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); 1123 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); 1124 1125 /* Try to create a covering process */ 1126 mutex_enter(&spa->spa_proc_lock); 1127 ASSERT(spa->spa_proc_state == SPA_PROC_NONE); 1128 ASSERT(spa->spa_proc == &p0); 1129 spa->spa_did = 0; 1130 1131 /* Only create a process if we're going to be around a while. */ 1132 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { 1133 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, 1134 NULL, 0) == 0) { 1135 spa->spa_proc_state = SPA_PROC_CREATED; 1136 while (spa->spa_proc_state == SPA_PROC_CREATED) { 1137 cv_wait(&spa->spa_proc_cv, 1138 &spa->spa_proc_lock); 1139 } 1140 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1141 ASSERT(spa->spa_proc != &p0); 1142 ASSERT(spa->spa_did != 0); 1143 } else { 1144 #ifdef _KERNEL 1145 cmn_err(CE_WARN, 1146 "Couldn't create process for zfs pool \"%s\"\n", 1147 spa->spa_name); 1148 #endif 1149 } 1150 } 1151 mutex_exit(&spa->spa_proc_lock); 1152 1153 /* If we didn't create a process, we need to create our taskqs. */ 1154 if (spa->spa_proc == &p0) { 1155 spa_create_zio_taskqs(spa); 1156 } 1157 1158 for (size_t i = 0; i < TXG_SIZE; i++) 1159 spa->spa_txg_zio[i] = zio_root(spa, NULL, NULL, 0); 1160 1161 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), 1162 offsetof(vdev_t, vdev_config_dirty_node)); 1163 list_create(&spa->spa_evicting_os_list, sizeof (objset_t), 1164 offsetof(objset_t, os_evicting_node)); 1165 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), 1166 offsetof(vdev_t, vdev_state_dirty_node)); 1167 1168 txg_list_create(&spa->spa_vdev_txg_list, spa, 1169 offsetof(struct vdev, vdev_txg_node)); 1170 1171 avl_create(&spa->spa_errlist_scrub, 1172 spa_error_entry_compare, sizeof (spa_error_entry_t), 1173 offsetof(spa_error_entry_t, se_avl)); 1174 avl_create(&spa->spa_errlist_last, 1175 spa_error_entry_compare, sizeof (spa_error_entry_t), 1176 offsetof(spa_error_entry_t, se_avl)); 1177 } 1178 1179 /* 1180 * Opposite of spa_activate(). 1181 */ 1182 static void 1183 spa_deactivate(spa_t *spa) 1184 { 1185 ASSERT(spa->spa_sync_on == B_FALSE); 1186 ASSERT(spa->spa_dsl_pool == NULL); 1187 ASSERT(spa->spa_root_vdev == NULL); 1188 ASSERT(spa->spa_async_zio_root == NULL); 1189 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); 1190 1191 spa_evicting_os_wait(spa); 1192 1193 txg_list_destroy(&spa->spa_vdev_txg_list); 1194 1195 list_destroy(&spa->spa_config_dirty_list); 1196 list_destroy(&spa->spa_evicting_os_list); 1197 list_destroy(&spa->spa_state_dirty_list); 1198 1199 for (int t = 0; t < ZIO_TYPES; t++) { 1200 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1201 spa_taskqs_fini(spa, t, q); 1202 } 1203 } 1204 1205 for (size_t i = 0; i < TXG_SIZE; i++) { 1206 ASSERT3P(spa->spa_txg_zio[i], !=, NULL); 1207 VERIFY0(zio_wait(spa->spa_txg_zio[i])); 1208 spa->spa_txg_zio[i] = NULL; 1209 } 1210 1211 metaslab_class_destroy(spa->spa_normal_class); 1212 spa->spa_normal_class = NULL; 1213 1214 metaslab_class_destroy(spa->spa_log_class); 1215 spa->spa_log_class = NULL; 1216 1217 /* 1218 * If this was part of an import or the open otherwise failed, we may 1219 * still have errors left in the queues. Empty them just in case. 1220 */ 1221 spa_errlog_drain(spa); 1222 1223 avl_destroy(&spa->spa_errlist_scrub); 1224 avl_destroy(&spa->spa_errlist_last); 1225 1226 spa->spa_state = POOL_STATE_UNINITIALIZED; 1227 1228 mutex_enter(&spa->spa_proc_lock); 1229 if (spa->spa_proc_state != SPA_PROC_NONE) { 1230 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1231 spa->spa_proc_state = SPA_PROC_DEACTIVATE; 1232 cv_broadcast(&spa->spa_proc_cv); 1233 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { 1234 ASSERT(spa->spa_proc != &p0); 1235 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1236 } 1237 ASSERT(spa->spa_proc_state == SPA_PROC_GONE); 1238 spa->spa_proc_state = SPA_PROC_NONE; 1239 } 1240 ASSERT(spa->spa_proc == &p0); 1241 mutex_exit(&spa->spa_proc_lock); 1242 1243 /* 1244 * We want to make sure spa_thread() has actually exited the ZFS 1245 * module, so that the module can't be unloaded out from underneath 1246 * it. 1247 */ 1248 if (spa->spa_did != 0) { 1249 thread_join(spa->spa_did); 1250 spa->spa_did = 0; 1251 } 1252 } 1253 1254 /* 1255 * Verify a pool configuration, and construct the vdev tree appropriately. This 1256 * will create all the necessary vdevs in the appropriate layout, with each vdev 1257 * in the CLOSED state. This will prep the pool before open/creation/import. 1258 * All vdev validation is done by the vdev_alloc() routine. 1259 */ 1260 static int 1261 spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, 1262 uint_t id, int atype) 1263 { 1264 nvlist_t **child; 1265 uint_t children; 1266 int error; 1267 1268 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) 1269 return (error); 1270 1271 if ((*vdp)->vdev_ops->vdev_op_leaf) 1272 return (0); 1273 1274 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1275 &child, &children); 1276 1277 if (error == ENOENT) 1278 return (0); 1279 1280 if (error) { 1281 vdev_free(*vdp); 1282 *vdp = NULL; 1283 return (SET_ERROR(EINVAL)); 1284 } 1285 1286 for (int c = 0; c < children; c++) { 1287 vdev_t *vd; 1288 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, 1289 atype)) != 0) { 1290 vdev_free(*vdp); 1291 *vdp = NULL; 1292 return (error); 1293 } 1294 } 1295 1296 ASSERT(*vdp != NULL); 1297 1298 return (0); 1299 } 1300 1301 /* 1302 * Opposite of spa_load(). 1303 */ 1304 static void 1305 spa_unload(spa_t *spa) 1306 { 1307 int i; 1308 1309 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1310 1311 spa_load_note(spa, "UNLOADING"); 1312 1313 /* 1314 * Stop async tasks. 1315 */ 1316 spa_async_suspend(spa); 1317 1318 /* 1319 * Stop syncing. 1320 */ 1321 if (spa->spa_sync_on) { 1322 txg_sync_stop(spa->spa_dsl_pool); 1323 spa->spa_sync_on = B_FALSE; 1324 } 1325 1326 /* 1327 * Even though vdev_free() also calls vdev_metaslab_fini, we need 1328 * to call it earlier, before we wait for async i/o to complete. 1329 * This ensures that there is no async metaslab prefetching, by 1330 * calling taskq_wait(mg_taskq). 1331 */ 1332 if (spa->spa_root_vdev != NULL) { 1333 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1334 for (int c = 0; c < spa->spa_root_vdev->vdev_children; c++) 1335 vdev_metaslab_fini(spa->spa_root_vdev->vdev_child[c]); 1336 spa_config_exit(spa, SCL_ALL, FTAG); 1337 } 1338 1339 /* 1340 * Wait for any outstanding async I/O to complete. 1341 */ 1342 if (spa->spa_async_zio_root != NULL) { 1343 for (int i = 0; i < max_ncpus; i++) 1344 (void) zio_wait(spa->spa_async_zio_root[i]); 1345 kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); 1346 spa->spa_async_zio_root = NULL; 1347 } 1348 1349 if (spa->spa_vdev_removal != NULL) { 1350 spa_vdev_removal_destroy(spa->spa_vdev_removal); 1351 spa->spa_vdev_removal = NULL; 1352 } 1353 1354 if (spa->spa_condense_zthr != NULL) { 1355 ASSERT(!zthr_isrunning(spa->spa_condense_zthr)); 1356 zthr_destroy(spa->spa_condense_zthr); 1357 spa->spa_condense_zthr = NULL; 1358 } 1359 1360 if (spa->spa_checkpoint_discard_zthr != NULL) { 1361 ASSERT(!zthr_isrunning(spa->spa_checkpoint_discard_zthr)); 1362 zthr_destroy(spa->spa_checkpoint_discard_zthr); 1363 spa->spa_checkpoint_discard_zthr = NULL; 1364 } 1365 1366 spa_condense_fini(spa); 1367 1368 bpobj_close(&spa->spa_deferred_bpobj); 1369 1370 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1371 1372 /* 1373 * Close all vdevs. 1374 */ 1375 if (spa->spa_root_vdev) 1376 vdev_free(spa->spa_root_vdev); 1377 ASSERT(spa->spa_root_vdev == NULL); 1378 1379 /* 1380 * Close the dsl pool. 1381 */ 1382 if (spa->spa_dsl_pool) { 1383 dsl_pool_close(spa->spa_dsl_pool); 1384 spa->spa_dsl_pool = NULL; 1385 spa->spa_meta_objset = NULL; 1386 } 1387 1388 ddt_unload(spa); 1389 1390 /* 1391 * Drop and purge level 2 cache 1392 */ 1393 spa_l2cache_drop(spa); 1394 1395 for (i = 0; i < spa->spa_spares.sav_count; i++) 1396 vdev_free(spa->spa_spares.sav_vdevs[i]); 1397 if (spa->spa_spares.sav_vdevs) { 1398 kmem_free(spa->spa_spares.sav_vdevs, 1399 spa->spa_spares.sav_count * sizeof (void *)); 1400 spa->spa_spares.sav_vdevs = NULL; 1401 } 1402 if (spa->spa_spares.sav_config) { 1403 nvlist_free(spa->spa_spares.sav_config); 1404 spa->spa_spares.sav_config = NULL; 1405 } 1406 spa->spa_spares.sav_count = 0; 1407 1408 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 1409 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); 1410 vdev_free(spa->spa_l2cache.sav_vdevs[i]); 1411 } 1412 if (spa->spa_l2cache.sav_vdevs) { 1413 kmem_free(spa->spa_l2cache.sav_vdevs, 1414 spa->spa_l2cache.sav_count * sizeof (void *)); 1415 spa->spa_l2cache.sav_vdevs = NULL; 1416 } 1417 if (spa->spa_l2cache.sav_config) { 1418 nvlist_free(spa->spa_l2cache.sav_config); 1419 spa->spa_l2cache.sav_config = NULL; 1420 } 1421 spa->spa_l2cache.sav_count = 0; 1422 1423 spa->spa_async_suspended = 0; 1424 1425 spa->spa_indirect_vdevs_loaded = B_FALSE; 1426 1427 if (spa->spa_comment != NULL) { 1428 spa_strfree(spa->spa_comment); 1429 spa->spa_comment = NULL; 1430 } 1431 1432 spa_config_exit(spa, SCL_ALL, FTAG); 1433 } 1434 1435 /* 1436 * Load (or re-load) the current list of vdevs describing the active spares for 1437 * this pool. When this is called, we have some form of basic information in 1438 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and 1439 * then re-generate a more complete list including status information. 1440 */ 1441 void 1442 spa_load_spares(spa_t *spa) 1443 { 1444 nvlist_t **spares; 1445 uint_t nspares; 1446 int i; 1447 vdev_t *vd, *tvd; 1448 1449 #ifndef _KERNEL 1450 /* 1451 * zdb opens both the current state of the pool and the 1452 * checkpointed state (if present), with a different spa_t. 1453 * 1454 * As spare vdevs are shared among open pools, we skip loading 1455 * them when we load the checkpointed state of the pool. 1456 */ 1457 if (!spa_writeable(spa)) 1458 return; 1459 #endif 1460 1461 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1462 1463 /* 1464 * First, close and free any existing spare vdevs. 1465 */ 1466 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1467 vd = spa->spa_spares.sav_vdevs[i]; 1468 1469 /* Undo the call to spa_activate() below */ 1470 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1471 B_FALSE)) != NULL && tvd->vdev_isspare) 1472 spa_spare_remove(tvd); 1473 vdev_close(vd); 1474 vdev_free(vd); 1475 } 1476 1477 if (spa->spa_spares.sav_vdevs) 1478 kmem_free(spa->spa_spares.sav_vdevs, 1479 spa->spa_spares.sav_count * sizeof (void *)); 1480 1481 if (spa->spa_spares.sav_config == NULL) 1482 nspares = 0; 1483 else 1484 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 1485 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 1486 1487 spa->spa_spares.sav_count = (int)nspares; 1488 spa->spa_spares.sav_vdevs = NULL; 1489 1490 if (nspares == 0) 1491 return; 1492 1493 /* 1494 * Construct the array of vdevs, opening them to get status in the 1495 * process. For each spare, there is potentially two different vdev_t 1496 * structures associated with it: one in the list of spares (used only 1497 * for basic validation purposes) and one in the active vdev 1498 * configuration (if it's spared in). During this phase we open and 1499 * validate each vdev on the spare list. If the vdev also exists in the 1500 * active configuration, then we also mark this vdev as an active spare. 1501 */ 1502 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *), 1503 KM_SLEEP); 1504 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1505 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, 1506 VDEV_ALLOC_SPARE) == 0); 1507 ASSERT(vd != NULL); 1508 1509 spa->spa_spares.sav_vdevs[i] = vd; 1510 1511 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1512 B_FALSE)) != NULL) { 1513 if (!tvd->vdev_isspare) 1514 spa_spare_add(tvd); 1515 1516 /* 1517 * We only mark the spare active if we were successfully 1518 * able to load the vdev. Otherwise, importing a pool 1519 * with a bad active spare would result in strange 1520 * behavior, because multiple pool would think the spare 1521 * is actively in use. 1522 * 1523 * There is a vulnerability here to an equally bizarre 1524 * circumstance, where a dead active spare is later 1525 * brought back to life (onlined or otherwise). Given 1526 * the rarity of this scenario, and the extra complexity 1527 * it adds, we ignore the possibility. 1528 */ 1529 if (!vdev_is_dead(tvd)) 1530 spa_spare_activate(tvd); 1531 } 1532 1533 vd->vdev_top = vd; 1534 vd->vdev_aux = &spa->spa_spares; 1535 1536 if (vdev_open(vd) != 0) 1537 continue; 1538 1539 if (vdev_validate_aux(vd) == 0) 1540 spa_spare_add(vd); 1541 } 1542 1543 /* 1544 * Recompute the stashed list of spares, with status information 1545 * this time. 1546 */ 1547 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, 1548 DATA_TYPE_NVLIST_ARRAY) == 0); 1549 1550 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), 1551 KM_SLEEP); 1552 for (i = 0; i < spa->spa_spares.sav_count; i++) 1553 spares[i] = vdev_config_generate(spa, 1554 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); 1555 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 1556 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); 1557 for (i = 0; i < spa->spa_spares.sav_count; i++) 1558 nvlist_free(spares[i]); 1559 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); 1560 } 1561 1562 /* 1563 * Load (or re-load) the current list of vdevs describing the active l2cache for 1564 * this pool. When this is called, we have some form of basic information in 1565 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and 1566 * then re-generate a more complete list including status information. 1567 * Devices which are already active have their details maintained, and are 1568 * not re-opened. 1569 */ 1570 void 1571 spa_load_l2cache(spa_t *spa) 1572 { 1573 nvlist_t **l2cache; 1574 uint_t nl2cache; 1575 int i, j, oldnvdevs; 1576 uint64_t guid; 1577 vdev_t *vd, **oldvdevs, **newvdevs; 1578 spa_aux_vdev_t *sav = &spa->spa_l2cache; 1579 1580 #ifndef _KERNEL 1581 /* 1582 * zdb opens both the current state of the pool and the 1583 * checkpointed state (if present), with a different spa_t. 1584 * 1585 * As L2 caches are part of the ARC which is shared among open 1586 * pools, we skip loading them when we load the checkpointed 1587 * state of the pool. 1588 */ 1589 if (!spa_writeable(spa)) 1590 return; 1591 #endif 1592 1593 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1594 1595 if (sav->sav_config != NULL) { 1596 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 1597 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 1598 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); 1599 } else { 1600 nl2cache = 0; 1601 newvdevs = NULL; 1602 } 1603 1604 oldvdevs = sav->sav_vdevs; 1605 oldnvdevs = sav->sav_count; 1606 sav->sav_vdevs = NULL; 1607 sav->sav_count = 0; 1608 1609 /* 1610 * Process new nvlist of vdevs. 1611 */ 1612 for (i = 0; i < nl2cache; i++) { 1613 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, 1614 &guid) == 0); 1615 1616 newvdevs[i] = NULL; 1617 for (j = 0; j < oldnvdevs; j++) { 1618 vd = oldvdevs[j]; 1619 if (vd != NULL && guid == vd->vdev_guid) { 1620 /* 1621 * Retain previous vdev for add/remove ops. 1622 */ 1623 newvdevs[i] = vd; 1624 oldvdevs[j] = NULL; 1625 break; 1626 } 1627 } 1628 1629 if (newvdevs[i] == NULL) { 1630 /* 1631 * Create new vdev 1632 */ 1633 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, 1634 VDEV_ALLOC_L2CACHE) == 0); 1635 ASSERT(vd != NULL); 1636 newvdevs[i] = vd; 1637 1638 /* 1639 * Commit this vdev as an l2cache device, 1640 * even if it fails to open. 1641 */ 1642 spa_l2cache_add(vd); 1643 1644 vd->vdev_top = vd; 1645 vd->vdev_aux = sav; 1646 1647 spa_l2cache_activate(vd); 1648 1649 if (vdev_open(vd) != 0) 1650 continue; 1651 1652 (void) vdev_validate_aux(vd); 1653 1654 if (!vdev_is_dead(vd)) 1655 l2arc_add_vdev(spa, vd); 1656 } 1657 } 1658 1659 /* 1660 * Purge vdevs that were dropped 1661 */ 1662 for (i = 0; i < oldnvdevs; i++) { 1663 uint64_t pool; 1664 1665 vd = oldvdevs[i]; 1666 if (vd != NULL) { 1667 ASSERT(vd->vdev_isl2cache); 1668 1669 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 1670 pool != 0ULL && l2arc_vdev_present(vd)) 1671 l2arc_remove_vdev(vd); 1672 vdev_clear_stats(vd); 1673 vdev_free(vd); 1674 } 1675 } 1676 1677 if (oldvdevs) 1678 kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); 1679 1680 if (sav->sav_config == NULL) 1681 goto out; 1682 1683 sav->sav_vdevs = newvdevs; 1684 sav->sav_count = (int)nl2cache; 1685 1686 /* 1687 * Recompute the stashed list of l2cache devices, with status 1688 * information this time. 1689 */ 1690 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, 1691 DATA_TYPE_NVLIST_ARRAY) == 0); 1692 1693 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 1694 for (i = 0; i < sav->sav_count; i++) 1695 l2cache[i] = vdev_config_generate(spa, 1696 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); 1697 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 1698 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); 1699 out: 1700 for (i = 0; i < sav->sav_count; i++) 1701 nvlist_free(l2cache[i]); 1702 if (sav->sav_count) 1703 kmem_free(l2cache, sav->sav_count * sizeof (void *)); 1704 } 1705 1706 static int 1707 load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) 1708 { 1709 dmu_buf_t *db; 1710 char *packed = NULL; 1711 size_t nvsize = 0; 1712 int error; 1713 *value = NULL; 1714 1715 error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); 1716 if (error != 0) 1717 return (error); 1718 1719 nvsize = *(uint64_t *)db->db_data; 1720 dmu_buf_rele(db, FTAG); 1721 1722 packed = kmem_alloc(nvsize, KM_SLEEP); 1723 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, 1724 DMU_READ_PREFETCH); 1725 if (error == 0) 1726 error = nvlist_unpack(packed, nvsize, value, 0); 1727 kmem_free(packed, nvsize); 1728 1729 return (error); 1730 } 1731 1732 /* 1733 * Concrete top-level vdevs that are not missing and are not logs. At every 1734 * spa_sync we write new uberblocks to at least SPA_SYNC_MIN_VDEVS core tvds. 1735 */ 1736 static uint64_t 1737 spa_healthy_core_tvds(spa_t *spa) 1738 { 1739 vdev_t *rvd = spa->spa_root_vdev; 1740 uint64_t tvds = 0; 1741 1742 for (uint64_t i = 0; i < rvd->vdev_children; i++) { 1743 vdev_t *vd = rvd->vdev_child[i]; 1744 if (vd->vdev_islog) 1745 continue; 1746 if (vdev_is_concrete(vd) && !vdev_is_dead(vd)) 1747 tvds++; 1748 } 1749 1750 return (tvds); 1751 } 1752 1753 /* 1754 * Checks to see if the given vdev could not be opened, in which case we post a 1755 * sysevent to notify the autoreplace code that the device has been removed. 1756 */ 1757 static void 1758 spa_check_removed(vdev_t *vd) 1759 { 1760 for (uint64_t c = 0; c < vd->vdev_children; c++) 1761 spa_check_removed(vd->vdev_child[c]); 1762 1763 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && 1764 vdev_is_concrete(vd)) { 1765 zfs_post_autoreplace(vd->vdev_spa, vd); 1766 spa_event_notify(vd->vdev_spa, vd, NULL, ESC_ZFS_VDEV_CHECK); 1767 } 1768 } 1769 1770 static int 1771 spa_check_for_missing_logs(spa_t *spa) 1772 { 1773 vdev_t *rvd = spa->spa_root_vdev; 1774 1775 /* 1776 * If we're doing a normal import, then build up any additional 1777 * diagnostic information about missing log devices. 1778 * We'll pass this up to the user for further processing. 1779 */ 1780 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { 1781 nvlist_t **child, *nv; 1782 uint64_t idx = 0; 1783 1784 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **), 1785 KM_SLEEP); 1786 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1787 1788 for (uint64_t c = 0; c < rvd->vdev_children; c++) { 1789 vdev_t *tvd = rvd->vdev_child[c]; 1790 1791 /* 1792 * We consider a device as missing only if it failed 1793 * to open (i.e. offline or faulted is not considered 1794 * as missing). 1795 */ 1796 if (tvd->vdev_islog && 1797 tvd->vdev_state == VDEV_STATE_CANT_OPEN) { 1798 child[idx++] = vdev_config_generate(spa, tvd, 1799 B_FALSE, VDEV_CONFIG_MISSING); 1800 } 1801 } 1802 1803 if (idx > 0) { 1804 fnvlist_add_nvlist_array(nv, 1805 ZPOOL_CONFIG_CHILDREN, child, idx); 1806 fnvlist_add_nvlist(spa->spa_load_info, 1807 ZPOOL_CONFIG_MISSING_DEVICES, nv); 1808 1809 for (uint64_t i = 0; i < idx; i++) 1810 nvlist_free(child[i]); 1811 } 1812 nvlist_free(nv); 1813 kmem_free(child, rvd->vdev_children * sizeof (char **)); 1814 1815 if (idx > 0) { 1816 spa_load_failed(spa, "some log devices are missing"); 1817 vdev_dbgmsg_print_tree(rvd, 2); 1818 return (SET_ERROR(ENXIO)); 1819 } 1820 } else { 1821 for (uint64_t c = 0; c < rvd->vdev_children; c++) { 1822 vdev_t *tvd = rvd->vdev_child[c]; 1823 1824 if (tvd->vdev_islog && 1825 tvd->vdev_state == VDEV_STATE_CANT_OPEN) { 1826 spa_set_log_state(spa, SPA_LOG_CLEAR); 1827 spa_load_note(spa, "some log devices are " 1828 "missing, ZIL is dropped."); 1829 vdev_dbgmsg_print_tree(rvd, 2); 1830 break; 1831 } 1832 } 1833 } 1834 1835 return (0); 1836 } 1837 1838 /* 1839 * Check for missing log devices 1840 */ 1841 static boolean_t 1842 spa_check_logs(spa_t *spa) 1843 { 1844 boolean_t rv = B_FALSE; 1845 dsl_pool_t *dp = spa_get_dsl(spa); 1846 1847 switch (spa->spa_log_state) { 1848 case SPA_LOG_MISSING: 1849 /* need to recheck in case slog has been restored */ 1850 case SPA_LOG_UNKNOWN: 1851 rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 1852 zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0); 1853 if (rv) 1854 spa_set_log_state(spa, SPA_LOG_MISSING); 1855 break; 1856 } 1857 return (rv); 1858 } 1859 1860 static boolean_t 1861 spa_passivate_log(spa_t *spa) 1862 { 1863 vdev_t *rvd = spa->spa_root_vdev; 1864 boolean_t slog_found = B_FALSE; 1865 1866 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1867 1868 if (!spa_has_slogs(spa)) 1869 return (B_FALSE); 1870 1871 for (int c = 0; c < rvd->vdev_children; c++) { 1872 vdev_t *tvd = rvd->vdev_child[c]; 1873 metaslab_group_t *mg = tvd->vdev_mg; 1874 1875 if (tvd->vdev_islog) { 1876 metaslab_group_passivate(mg); 1877 slog_found = B_TRUE; 1878 } 1879 } 1880 1881 return (slog_found); 1882 } 1883 1884 static void 1885 spa_activate_log(spa_t *spa) 1886 { 1887 vdev_t *rvd = spa->spa_root_vdev; 1888 1889 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1890 1891 for (int c = 0; c < rvd->vdev_children; c++) { 1892 vdev_t *tvd = rvd->vdev_child[c]; 1893 metaslab_group_t *mg = tvd->vdev_mg; 1894 1895 if (tvd->vdev_islog) 1896 metaslab_group_activate(mg); 1897 } 1898 } 1899 1900 int 1901 spa_reset_logs(spa_t *spa) 1902 { 1903 int error; 1904 1905 error = dmu_objset_find(spa_name(spa), zil_reset, 1906 NULL, DS_FIND_CHILDREN); 1907 if (error == 0) { 1908 /* 1909 * We successfully offlined the log device, sync out the 1910 * current txg so that the "stubby" block can be removed 1911 * by zil_sync(). 1912 */ 1913 txg_wait_synced(spa->spa_dsl_pool, 0); 1914 } 1915 return (error); 1916 } 1917 1918 static void 1919 spa_aux_check_removed(spa_aux_vdev_t *sav) 1920 { 1921 for (int i = 0; i < sav->sav_count; i++) 1922 spa_check_removed(sav->sav_vdevs[i]); 1923 } 1924 1925 void 1926 spa_claim_notify(zio_t *zio) 1927 { 1928 spa_t *spa = zio->io_spa; 1929 1930 if (zio->io_error) 1931 return; 1932 1933 mutex_enter(&spa->spa_props_lock); /* any mutex will do */ 1934 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) 1935 spa->spa_claim_max_txg = zio->io_bp->blk_birth; 1936 mutex_exit(&spa->spa_props_lock); 1937 } 1938 1939 typedef struct spa_load_error { 1940 uint64_t sle_meta_count; 1941 uint64_t sle_data_count; 1942 } spa_load_error_t; 1943 1944 static void 1945 spa_load_verify_done(zio_t *zio) 1946 { 1947 blkptr_t *bp = zio->io_bp; 1948 spa_load_error_t *sle = zio->io_private; 1949 dmu_object_type_t type = BP_GET_TYPE(bp); 1950 int error = zio->io_error; 1951 spa_t *spa = zio->io_spa; 1952 1953 abd_free(zio->io_abd); 1954 if (error) { 1955 if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && 1956 type != DMU_OT_INTENT_LOG) 1957 atomic_inc_64(&sle->sle_meta_count); 1958 else 1959 atomic_inc_64(&sle->sle_data_count); 1960 } 1961 1962 mutex_enter(&spa->spa_scrub_lock); 1963 spa->spa_scrub_inflight--; 1964 cv_broadcast(&spa->spa_scrub_io_cv); 1965 mutex_exit(&spa->spa_scrub_lock); 1966 } 1967 1968 /* 1969 * Maximum number of concurrent scrub i/os to create while verifying 1970 * a pool while importing it. 1971 */ 1972 int spa_load_verify_maxinflight = 10000; 1973 boolean_t spa_load_verify_metadata = B_TRUE; 1974 boolean_t spa_load_verify_data = B_TRUE; 1975 1976 /*ARGSUSED*/ 1977 static int 1978 spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1979 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1980 { 1981 if (bp == NULL || BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 1982 return (0); 1983 /* 1984 * Note: normally this routine will not be called if 1985 * spa_load_verify_metadata is not set. However, it may be useful 1986 * to manually set the flag after the traversal has begun. 1987 */ 1988 if (!spa_load_verify_metadata) 1989 return (0); 1990 if (!BP_IS_METADATA(bp) && !spa_load_verify_data) 1991 return (0); 1992 1993 zio_t *rio = arg; 1994 size_t size = BP_GET_PSIZE(bp); 1995 1996 mutex_enter(&spa->spa_scrub_lock); 1997 while (spa->spa_scrub_inflight >= spa_load_verify_maxinflight) 1998 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 1999 spa->spa_scrub_inflight++; 2000 mutex_exit(&spa->spa_scrub_lock); 2001 2002 zio_nowait(zio_read(rio, spa, bp, abd_alloc_for_io(size, B_FALSE), size, 2003 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, 2004 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | 2005 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); 2006 return (0); 2007 } 2008 2009 /* ARGSUSED */ 2010 int 2011 verify_dataset_name_len(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) 2012 { 2013 if (dsl_dataset_namelen(ds) >= ZFS_MAX_DATASET_NAME_LEN) 2014 return (SET_ERROR(ENAMETOOLONG)); 2015 2016 return (0); 2017 } 2018 2019 static int 2020 spa_load_verify(spa_t *spa) 2021 { 2022 zio_t *rio; 2023 spa_load_error_t sle = { 0 }; 2024 zpool_load_policy_t policy; 2025 boolean_t verify_ok = B_FALSE; 2026 int error = 0; 2027 2028 zpool_get_load_policy(spa->spa_config, &policy); 2029 2030 if (policy.zlp_rewind & ZPOOL_NEVER_REWIND) 2031 return (0); 2032 2033 dsl_pool_config_enter(spa->spa_dsl_pool, FTAG); 2034 error = dmu_objset_find_dp(spa->spa_dsl_pool, 2035 spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL, 2036 DS_FIND_CHILDREN); 2037 dsl_pool_config_exit(spa->spa_dsl_pool, FTAG); 2038 if (error != 0) 2039 return (error); 2040 2041 rio = zio_root(spa, NULL, &sle, 2042 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 2043 2044 if (spa_load_verify_metadata) { 2045 if (spa->spa_extreme_rewind) { 2046 spa_load_note(spa, "performing a complete scan of the " 2047 "pool since extreme rewind is on. This may take " 2048 "a very long time.\n (spa_load_verify_data=%u, " 2049 "spa_load_verify_metadata=%u)", 2050 spa_load_verify_data, spa_load_verify_metadata); 2051 } 2052 error = traverse_pool(spa, spa->spa_verify_min_txg, 2053 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 2054 spa_load_verify_cb, rio); 2055 } 2056 2057 (void) zio_wait(rio); 2058 2059 spa->spa_load_meta_errors = sle.sle_meta_count; 2060 spa->spa_load_data_errors = sle.sle_data_count; 2061 2062 if (sle.sle_meta_count != 0 || sle.sle_data_count != 0) { 2063 spa_load_note(spa, "spa_load_verify found %llu metadata errors " 2064 "and %llu data errors", (u_longlong_t)sle.sle_meta_count, 2065 (u_longlong_t)sle.sle_data_count); 2066 } 2067 2068 if (spa_load_verify_dryrun || 2069 (!error && sle.sle_meta_count <= policy.zlp_maxmeta && 2070 sle.sle_data_count <= policy.zlp_maxdata)) { 2071 int64_t loss = 0; 2072 2073 verify_ok = B_TRUE; 2074 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 2075 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 2076 2077 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 2078 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2079 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 2080 VERIFY(nvlist_add_int64(spa->spa_load_info, 2081 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 2082 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2083 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 2084 } else { 2085 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 2086 } 2087 2088 if (spa_load_verify_dryrun) 2089 return (0); 2090 2091 if (error) { 2092 if (error != ENXIO && error != EIO) 2093 error = SET_ERROR(EIO); 2094 return (error); 2095 } 2096 2097 return (verify_ok ? 0 : EIO); 2098 } 2099 2100 /* 2101 * Find a value in the pool props object. 2102 */ 2103 static void 2104 spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2105 { 2106 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2107 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2108 } 2109 2110 /* 2111 * Find a value in the pool directory object. 2112 */ 2113 static int 2114 spa_dir_prop(spa_t *spa, const char *name, uint64_t *val, boolean_t log_enoent) 2115 { 2116 int error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2117 name, sizeof (uint64_t), 1, val); 2118 2119 if (error != 0 && (error != ENOENT || log_enoent)) { 2120 spa_load_failed(spa, "couldn't get '%s' value in MOS directory " 2121 "[error=%d]", name, error); 2122 } 2123 2124 return (error); 2125 } 2126 2127 static int 2128 spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2129 { 2130 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2131 return (SET_ERROR(err)); 2132 } 2133 2134 static void 2135 spa_spawn_aux_threads(spa_t *spa) 2136 { 2137 ASSERT(spa_writeable(spa)); 2138 2139 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2140 2141 spa_start_indirect_condensing_thread(spa); 2142 2143 ASSERT3P(spa->spa_checkpoint_discard_zthr, ==, NULL); 2144 spa->spa_checkpoint_discard_zthr = 2145 zthr_create(spa_checkpoint_discard_thread_check, 2146 spa_checkpoint_discard_thread, spa); 2147 } 2148 2149 /* 2150 * Fix up config after a partly-completed split. This is done with the 2151 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2152 * pool have that entry in their config, but only the splitting one contains 2153 * a list of all the guids of the vdevs that are being split off. 2154 * 2155 * This function determines what to do with that list: either rejoin 2156 * all the disks to the pool, or complete the splitting process. To attempt 2157 * the rejoin, each disk that is offlined is marked online again, and 2158 * we do a reopen() call. If the vdev label for every disk that was 2159 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2160 * then we call vdev_split() on each disk, and complete the split. 2161 * 2162 * Otherwise we leave the config alone, with all the vdevs in place in 2163 * the original pool. 2164 */ 2165 static void 2166 spa_try_repair(spa_t *spa, nvlist_t *config) 2167 { 2168 uint_t extracted; 2169 uint64_t *glist; 2170 uint_t i, gcount; 2171 nvlist_t *nvl; 2172 vdev_t **vd; 2173 boolean_t attempt_reopen; 2174 2175 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2176 return; 2177 2178 /* check that the config is complete */ 2179 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2180 &glist, &gcount) != 0) 2181 return; 2182 2183 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2184 2185 /* attempt to online all the vdevs & validate */ 2186 attempt_reopen = B_TRUE; 2187 for (i = 0; i < gcount; i++) { 2188 if (glist[i] == 0) /* vdev is hole */ 2189 continue; 2190 2191 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2192 if (vd[i] == NULL) { 2193 /* 2194 * Don't bother attempting to reopen the disks; 2195 * just do the split. 2196 */ 2197 attempt_reopen = B_FALSE; 2198 } else { 2199 /* attempt to re-online it */ 2200 vd[i]->vdev_offline = B_FALSE; 2201 } 2202 } 2203 2204 if (attempt_reopen) { 2205 vdev_reopen(spa->spa_root_vdev); 2206 2207 /* check each device to see what state it's in */ 2208 for (extracted = 0, i = 0; i < gcount; i++) { 2209 if (vd[i] != NULL && 2210 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2211 break; 2212 ++extracted; 2213 } 2214 } 2215 2216 /* 2217 * If every disk has been moved to the new pool, or if we never 2218 * even attempted to look at them, then we split them off for 2219 * good. 2220 */ 2221 if (!attempt_reopen || gcount == extracted) { 2222 for (i = 0; i < gcount; i++) 2223 if (vd[i] != NULL) 2224 vdev_split(vd[i]); 2225 vdev_reopen(spa->spa_root_vdev); 2226 } 2227 2228 kmem_free(vd, gcount * sizeof (vdev_t *)); 2229 } 2230 2231 static int 2232 spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type) 2233 { 2234 char *ereport = FM_EREPORT_ZFS_POOL; 2235 int error; 2236 2237 spa->spa_load_state = state; 2238 2239 gethrestime(&spa->spa_loaded_ts); 2240 error = spa_load_impl(spa, type, &ereport); 2241 2242 /* 2243 * Don't count references from objsets that are already closed 2244 * and are making their way through the eviction process. 2245 */ 2246 spa_evicting_os_wait(spa); 2247 spa->spa_minref = refcount_count(&spa->spa_refcount); 2248 if (error) { 2249 if (error != EEXIST) { 2250 spa->spa_loaded_ts.tv_sec = 0; 2251 spa->spa_loaded_ts.tv_nsec = 0; 2252 } 2253 if (error != EBADF) { 2254 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2255 } 2256 } 2257 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2258 spa->spa_ena = 0; 2259 2260 return (error); 2261 } 2262 2263 /* 2264 * Count the number of per-vdev ZAPs associated with all of the vdevs in the 2265 * vdev tree rooted in the given vd, and ensure that each ZAP is present in the 2266 * spa's per-vdev ZAP list. 2267 */ 2268 static uint64_t 2269 vdev_count_verify_zaps(vdev_t *vd) 2270 { 2271 spa_t *spa = vd->vdev_spa; 2272 uint64_t total = 0; 2273 if (vd->vdev_top_zap != 0) { 2274 total++; 2275 ASSERT0(zap_lookup_int(spa->spa_meta_objset, 2276 spa->spa_all_vdev_zaps, vd->vdev_top_zap)); 2277 } 2278 if (vd->vdev_leaf_zap != 0) { 2279 total++; 2280 ASSERT0(zap_lookup_int(spa->spa_meta_objset, 2281 spa->spa_all_vdev_zaps, vd->vdev_leaf_zap)); 2282 } 2283 2284 for (uint64_t i = 0; i < vd->vdev_children; i++) { 2285 total += vdev_count_verify_zaps(vd->vdev_child[i]); 2286 } 2287 2288 return (total); 2289 } 2290 2291 static int 2292 spa_verify_host(spa_t *spa, nvlist_t *mos_config) 2293 { 2294 uint64_t hostid; 2295 char *hostname; 2296 uint64_t myhostid = 0; 2297 2298 if (!spa_is_root(spa) && nvlist_lookup_uint64(mos_config, 2299 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2300 hostname = fnvlist_lookup_string(mos_config, 2301 ZPOOL_CONFIG_HOSTNAME); 2302 2303 myhostid = zone_get_hostid(NULL); 2304 2305 if (hostid != 0 && myhostid != 0 && hostid != myhostid) { 2306 cmn_err(CE_WARN, "pool '%s' could not be " 2307 "loaded as it was last accessed by " 2308 "another system (host: %s hostid: 0x%llx). " 2309 "See: http://illumos.org/msg/ZFS-8000-EY", 2310 spa_name(spa), hostname, (u_longlong_t)hostid); 2311 spa_load_failed(spa, "hostid verification failed: pool " 2312 "last accessed by host: %s (hostid: 0x%llx)", 2313 hostname, (u_longlong_t)hostid); 2314 return (SET_ERROR(EBADF)); 2315 } 2316 } 2317 2318 return (0); 2319 } 2320 2321 static int 2322 spa_ld_parse_config(spa_t *spa, spa_import_type_t type) 2323 { 2324 int error = 0; 2325 nvlist_t *nvtree, *nvl, *config = spa->spa_config; 2326 int parse; 2327 vdev_t *rvd; 2328 uint64_t pool_guid; 2329 char *comment; 2330 2331 /* 2332 * Versioning wasn't explicitly added to the label until later, so if 2333 * it's not present treat it as the initial version. 2334 */ 2335 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2336 &spa->spa_ubsync.ub_version) != 0) 2337 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2338 2339 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) { 2340 spa_load_failed(spa, "invalid config provided: '%s' missing", 2341 ZPOOL_CONFIG_POOL_GUID); 2342 return (SET_ERROR(EINVAL)); 2343 } 2344 2345 /* 2346 * If we are doing an import, ensure that the pool is not already 2347 * imported by checking if its pool guid already exists in the 2348 * spa namespace. 2349 * 2350 * The only case that we allow an already imported pool to be 2351 * imported again, is when the pool is checkpointed and we want to 2352 * look at its checkpointed state from userland tools like zdb. 2353 */ 2354 #ifdef _KERNEL 2355 if ((spa->spa_load_state == SPA_LOAD_IMPORT || 2356 spa->spa_load_state == SPA_LOAD_TRYIMPORT) && 2357 spa_guid_exists(pool_guid, 0)) { 2358 #else 2359 if ((spa->spa_load_state == SPA_LOAD_IMPORT || 2360 spa->spa_load_state == SPA_LOAD_TRYIMPORT) && 2361 spa_guid_exists(pool_guid, 0) && 2362 !spa_importing_readonly_checkpoint(spa)) { 2363 #endif 2364 spa_load_failed(spa, "a pool with guid %llu is already open", 2365 (u_longlong_t)pool_guid); 2366 return (SET_ERROR(EEXIST)); 2367 } 2368 2369 spa->spa_config_guid = pool_guid; 2370 2371 nvlist_free(spa->spa_load_info); 2372 spa->spa_load_info = fnvlist_alloc(); 2373 2374 ASSERT(spa->spa_comment == NULL); 2375 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2376 spa->spa_comment = spa_strdup(comment); 2377 2378 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2379 &spa->spa_config_txg); 2380 2381 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) == 0) 2382 spa->spa_config_splitting = fnvlist_dup(nvl); 2383 2384 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvtree)) { 2385 spa_load_failed(spa, "invalid config provided: '%s' missing", 2386 ZPOOL_CONFIG_VDEV_TREE); 2387 return (SET_ERROR(EINVAL)); 2388 } 2389 2390 /* 2391 * Create "The Godfather" zio to hold all async IOs 2392 */ 2393 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2394 KM_SLEEP); 2395 for (int i = 0; i < max_ncpus; i++) { 2396 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2397 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2398 ZIO_FLAG_GODFATHER); 2399 } 2400 2401 /* 2402 * Parse the configuration into a vdev tree. We explicitly set the 2403 * value that will be returned by spa_version() since parsing the 2404 * configuration requires knowing the version number. 2405 */ 2406 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2407 parse = (type == SPA_IMPORT_EXISTING ? 2408 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2409 error = spa_config_parse(spa, &rvd, nvtree, NULL, 0, parse); 2410 spa_config_exit(spa, SCL_ALL, FTAG); 2411 2412 if (error != 0) { 2413 spa_load_failed(spa, "unable to parse config [error=%d]", 2414 error); 2415 return (error); 2416 } 2417 2418 ASSERT(spa->spa_root_vdev == rvd); 2419 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2420 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2421 2422 if (type != SPA_IMPORT_ASSEMBLE) { 2423 ASSERT(spa_guid(spa) == pool_guid); 2424 } 2425 2426 return (0); 2427 } 2428 2429 /* 2430 * Recursively open all vdevs in the vdev tree. This function is called twice: 2431 * first with the untrusted config, then with the trusted config. 2432 */ 2433 static int 2434 spa_ld_open_vdevs(spa_t *spa) 2435 { 2436 int error = 0; 2437 2438 /* 2439 * spa_missing_tvds_allowed defines how many top-level vdevs can be 2440 * missing/unopenable for the root vdev to be still considered openable. 2441 */ 2442 if (spa->spa_trust_config) { 2443 spa->spa_missing_tvds_allowed = zfs_max_missing_tvds; 2444 } else if (spa->spa_config_source == SPA_CONFIG_SRC_CACHEFILE) { 2445 spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_cachefile; 2446 } else if (spa->spa_config_source == SPA_CONFIG_SRC_SCAN) { 2447 spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_scan; 2448 } else { 2449 spa->spa_missing_tvds_allowed = 0; 2450 } 2451 2452 spa->spa_missing_tvds_allowed = 2453 MAX(zfs_max_missing_tvds, spa->spa_missing_tvds_allowed); 2454 2455 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2456 error = vdev_open(spa->spa_root_vdev); 2457 spa_config_exit(spa, SCL_ALL, FTAG); 2458 2459 if (spa->spa_missing_tvds != 0) { 2460 spa_load_note(spa, "vdev tree has %lld missing top-level " 2461 "vdevs.", (u_longlong_t)spa->spa_missing_tvds); 2462 if (spa->spa_trust_config && (spa->spa_mode & FWRITE)) { 2463 /* 2464 * Although theoretically we could allow users to open 2465 * incomplete pools in RW mode, we'd need to add a lot 2466 * of extra logic (e.g. adjust pool space to account 2467 * for missing vdevs). 2468 * This limitation also prevents users from accidentally 2469 * opening the pool in RW mode during data recovery and 2470 * damaging it further. 2471 */ 2472 spa_load_note(spa, "pools with missing top-level " 2473 "vdevs can only be opened in read-only mode."); 2474 error = SET_ERROR(ENXIO); 2475 } else { 2476 spa_load_note(spa, "current settings allow for maximum " 2477 "%lld missing top-level vdevs at this stage.", 2478 (u_longlong_t)spa->spa_missing_tvds_allowed); 2479 } 2480 } 2481 if (error != 0) { 2482 spa_load_failed(spa, "unable to open vdev tree [error=%d]", 2483 error); 2484 } 2485 if (spa->spa_missing_tvds != 0 || error != 0) 2486 vdev_dbgmsg_print_tree(spa->spa_root_vdev, 2); 2487 2488 return (error); 2489 } 2490 2491 /* 2492 * We need to validate the vdev labels against the configuration that 2493 * we have in hand. This function is called twice: first with an untrusted 2494 * config, then with a trusted config. The validation is more strict when the 2495 * config is trusted. 2496 */ 2497 static int 2498 spa_ld_validate_vdevs(spa_t *spa) 2499 { 2500 int error = 0; 2501 vdev_t *rvd = spa->spa_root_vdev; 2502 2503 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2504 error = vdev_validate(rvd); 2505 spa_config_exit(spa, SCL_ALL, FTAG); 2506 2507 if (error != 0) { 2508 spa_load_failed(spa, "vdev_validate failed [error=%d]", error); 2509 return (error); 2510 } 2511 2512 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) { 2513 spa_load_failed(spa, "cannot open vdev tree after invalidating " 2514 "some vdevs"); 2515 vdev_dbgmsg_print_tree(rvd, 2); 2516 return (SET_ERROR(ENXIO)); 2517 } 2518 2519 return (0); 2520 } 2521 2522 static void 2523 spa_ld_select_uberblock_done(spa_t *spa, uberblock_t *ub) 2524 { 2525 spa->spa_state = POOL_STATE_ACTIVE; 2526 spa->spa_ubsync = spa->spa_uberblock; 2527 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2528 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2529 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2530 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2531 spa->spa_claim_max_txg = spa->spa_first_txg; 2532 spa->spa_prev_software_version = ub->ub_software_version; 2533 } 2534 2535 static int 2536 spa_ld_select_uberblock(spa_t *spa, spa_import_type_t type) 2537 { 2538 vdev_t *rvd = spa->spa_root_vdev; 2539 nvlist_t *label; 2540 uberblock_t *ub = &spa->spa_uberblock; 2541 2542 /* 2543 * If we are opening the checkpointed state of the pool by 2544 * rewinding to it, at this point we will have written the 2545 * checkpointed uberblock to the vdev labels, so searching 2546 * the labels will find the right uberblock. However, if 2547 * we are opening the checkpointed state read-only, we have 2548 * not modified the labels. Therefore, we must ignore the 2549 * labels and continue using the spa_uberblock that was set 2550 * by spa_ld_checkpoint_rewind. 2551 * 2552 * Note that it would be fine to ignore the labels when 2553 * rewinding (opening writeable) as well. However, if we 2554 * crash just after writing the labels, we will end up 2555 * searching the labels. Doing so in the common case means 2556 * that this code path gets exercised normally, rather than 2557 * just in the edge case. 2558 */ 2559 if (ub->ub_checkpoint_txg != 0 && 2560 spa_importing_readonly_checkpoint(spa)) { 2561 spa_ld_select_uberblock_done(spa, ub); 2562 return (0); 2563 } 2564 2565 /* 2566 * Find the best uberblock. 2567 */ 2568 vdev_uberblock_load(rvd, ub, &label); 2569 2570 /* 2571 * If we weren't able to find a single valid uberblock, return failure. 2572 */ 2573 if (ub->ub_txg == 0) { 2574 nvlist_free(label); 2575 spa_load_failed(spa, "no valid uberblock found"); 2576 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2577 } 2578 2579 spa_load_note(spa, "using uberblock with txg=%llu", 2580 (u_longlong_t)ub->ub_txg); 2581 2582 /* 2583 * If the pool has an unsupported version we can't open it. 2584 */ 2585 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2586 nvlist_free(label); 2587 spa_load_failed(spa, "version %llu is not supported", 2588 (u_longlong_t)ub->ub_version); 2589 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2590 } 2591 2592 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2593 nvlist_t *features; 2594 2595 /* 2596 * If we weren't able to find what's necessary for reading the 2597 * MOS in the label, return failure. 2598 */ 2599 if (label == NULL) { 2600 spa_load_failed(spa, "label config unavailable"); 2601 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2602 ENXIO)); 2603 } 2604 2605 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_FEATURES_FOR_READ, 2606 &features) != 0) { 2607 nvlist_free(label); 2608 spa_load_failed(spa, "invalid label: '%s' missing", 2609 ZPOOL_CONFIG_FEATURES_FOR_READ); 2610 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2611 ENXIO)); 2612 } 2613 2614 /* 2615 * Update our in-core representation with the definitive values 2616 * from the label. 2617 */ 2618 nvlist_free(spa->spa_label_features); 2619 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2620 } 2621 2622 nvlist_free(label); 2623 2624 /* 2625 * Look through entries in the label nvlist's features_for_read. If 2626 * there is a feature listed there which we don't understand then we 2627 * cannot open a pool. 2628 */ 2629 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2630 nvlist_t *unsup_feat; 2631 2632 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2633 0); 2634 2635 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2636 NULL); nvp != NULL; 2637 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2638 if (!zfeature_is_supported(nvpair_name(nvp))) { 2639 VERIFY(nvlist_add_string(unsup_feat, 2640 nvpair_name(nvp), "") == 0); 2641 } 2642 } 2643 2644 if (!nvlist_empty(unsup_feat)) { 2645 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2646 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2647 nvlist_free(unsup_feat); 2648 spa_load_failed(spa, "some features are unsupported"); 2649 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2650 ENOTSUP)); 2651 } 2652 2653 nvlist_free(unsup_feat); 2654 } 2655 2656 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2657 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2658 spa_try_repair(spa, spa->spa_config); 2659 spa_config_exit(spa, SCL_ALL, FTAG); 2660 nvlist_free(spa->spa_config_splitting); 2661 spa->spa_config_splitting = NULL; 2662 } 2663 2664 /* 2665 * Initialize internal SPA structures. 2666 */ 2667 spa_ld_select_uberblock_done(spa, ub); 2668 2669 return (0); 2670 } 2671 2672 static int 2673 spa_ld_open_rootbp(spa_t *spa) 2674 { 2675 int error = 0; 2676 vdev_t *rvd = spa->spa_root_vdev; 2677 2678 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2679 if (error != 0) { 2680 spa_load_failed(spa, "unable to open rootbp in dsl_pool_init " 2681 "[error=%d]", error); 2682 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2683 } 2684 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2685 2686 return (0); 2687 } 2688 2689 static int 2690 spa_ld_trusted_config(spa_t *spa, spa_import_type_t type, 2691 boolean_t reloading) 2692 { 2693 vdev_t *mrvd, *rvd = spa->spa_root_vdev; 2694 nvlist_t *nv, *mos_config, *policy; 2695 int error = 0, copy_error; 2696 uint64_t healthy_tvds, healthy_tvds_mos; 2697 uint64_t mos_config_txg; 2698 2699 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object, B_TRUE) 2700 != 0) 2701 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2702 2703 /* 2704 * If we're assembling a pool from a split, the config provided is 2705 * already trusted so there is nothing to do. 2706 */ 2707 if (type == SPA_IMPORT_ASSEMBLE) 2708 return (0); 2709 2710 healthy_tvds = spa_healthy_core_tvds(spa); 2711 2712 if (load_nvlist(spa, spa->spa_config_object, &mos_config) 2713 != 0) { 2714 spa_load_failed(spa, "unable to retrieve MOS config"); 2715 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2716 } 2717 2718 /* 2719 * If we are doing an open, pool owner wasn't verified yet, thus do 2720 * the verification here. 2721 */ 2722 if (spa->spa_load_state == SPA_LOAD_OPEN) { 2723 error = spa_verify_host(spa, mos_config); 2724 if (error != 0) { 2725 nvlist_free(mos_config); 2726 return (error); 2727 } 2728 } 2729 2730 nv = fnvlist_lookup_nvlist(mos_config, ZPOOL_CONFIG_VDEV_TREE); 2731 2732 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2733 2734 /* 2735 * Build a new vdev tree from the trusted config 2736 */ 2737 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); 2738 2739 /* 2740 * Vdev paths in the MOS may be obsolete. If the untrusted config was 2741 * obtained by scanning /dev/dsk, then it will have the right vdev 2742 * paths. We update the trusted MOS config with this information. 2743 * We first try to copy the paths with vdev_copy_path_strict, which 2744 * succeeds only when both configs have exactly the same vdev tree. 2745 * If that fails, we fall back to a more flexible method that has a 2746 * best effort policy. 2747 */ 2748 copy_error = vdev_copy_path_strict(rvd, mrvd); 2749 if (copy_error != 0 || spa_load_print_vdev_tree) { 2750 spa_load_note(spa, "provided vdev tree:"); 2751 vdev_dbgmsg_print_tree(rvd, 2); 2752 spa_load_note(spa, "MOS vdev tree:"); 2753 vdev_dbgmsg_print_tree(mrvd, 2); 2754 } 2755 if (copy_error != 0) { 2756 spa_load_note(spa, "vdev_copy_path_strict failed, falling " 2757 "back to vdev_copy_path_relaxed"); 2758 vdev_copy_path_relaxed(rvd, mrvd); 2759 } 2760 2761 vdev_close(rvd); 2762 vdev_free(rvd); 2763 spa->spa_root_vdev = mrvd; 2764 rvd = mrvd; 2765 spa_config_exit(spa, SCL_ALL, FTAG); 2766 2767 /* 2768 * We will use spa_config if we decide to reload the spa or if spa_load 2769 * fails and we rewind. We must thus regenerate the config using the 2770 * MOS information with the updated paths. ZPOOL_LOAD_POLICY is used to 2771 * pass settings on how to load the pool and is not stored in the MOS. 2772 * We copy it over to our new, trusted config. 2773 */ 2774 mos_config_txg = fnvlist_lookup_uint64(mos_config, 2775 ZPOOL_CONFIG_POOL_TXG); 2776 nvlist_free(mos_config); 2777 mos_config = spa_config_generate(spa, NULL, mos_config_txg, B_FALSE); 2778 if (nvlist_lookup_nvlist(spa->spa_config, ZPOOL_LOAD_POLICY, 2779 &policy) == 0) 2780 fnvlist_add_nvlist(mos_config, ZPOOL_LOAD_POLICY, policy); 2781 spa_config_set(spa, mos_config); 2782 spa->spa_config_source = SPA_CONFIG_SRC_MOS; 2783 2784 /* 2785 * Now that we got the config from the MOS, we should be more strict 2786 * in checking blkptrs and can make assumptions about the consistency 2787 * of the vdev tree. spa_trust_config must be set to true before opening 2788 * vdevs in order for them to be writeable. 2789 */ 2790 spa->spa_trust_config = B_TRUE; 2791 2792 /* 2793 * Open and validate the new vdev tree 2794 */ 2795 error = spa_ld_open_vdevs(spa); 2796 if (error != 0) 2797 return (error); 2798 2799 error = spa_ld_validate_vdevs(spa); 2800 if (error != 0) 2801 return (error); 2802 2803 if (copy_error != 0 || spa_load_print_vdev_tree) { 2804 spa_load_note(spa, "final vdev tree:"); 2805 vdev_dbgmsg_print_tree(rvd, 2); 2806 } 2807 2808 if (spa->spa_load_state != SPA_LOAD_TRYIMPORT && 2809 !spa->spa_extreme_rewind && zfs_max_missing_tvds == 0) { 2810 /* 2811 * Sanity check to make sure that we are indeed loading the 2812 * latest uberblock. If we missed SPA_SYNC_MIN_VDEVS tvds 2813 * in the config provided and they happened to be the only ones 2814 * to have the latest uberblock, we could involuntarily perform 2815 * an extreme rewind. 2816 */ 2817 healthy_tvds_mos = spa_healthy_core_tvds(spa); 2818 if (healthy_tvds_mos - healthy_tvds >= 2819 SPA_SYNC_MIN_VDEVS) { 2820 spa_load_note(spa, "config provided misses too many " 2821 "top-level vdevs compared to MOS (%lld vs %lld). ", 2822 (u_longlong_t)healthy_tvds, 2823 (u_longlong_t)healthy_tvds_mos); 2824 spa_load_note(spa, "vdev tree:"); 2825 vdev_dbgmsg_print_tree(rvd, 2); 2826 if (reloading) { 2827 spa_load_failed(spa, "config was already " 2828 "provided from MOS. Aborting."); 2829 return (spa_vdev_err(rvd, 2830 VDEV_AUX_CORRUPT_DATA, EIO)); 2831 } 2832 spa_load_note(spa, "spa must be reloaded using MOS " 2833 "config"); 2834 return (SET_ERROR(EAGAIN)); 2835 } 2836 } 2837 2838 error = spa_check_for_missing_logs(spa); 2839 if (error != 0) 2840 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2841 2842 if (rvd->vdev_guid_sum != spa->spa_uberblock.ub_guid_sum) { 2843 spa_load_failed(spa, "uberblock guid sum doesn't match MOS " 2844 "guid sum (%llu != %llu)", 2845 (u_longlong_t)spa->spa_uberblock.ub_guid_sum, 2846 (u_longlong_t)rvd->vdev_guid_sum); 2847 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2848 ENXIO)); 2849 } 2850 2851 return (0); 2852 } 2853 2854 static int 2855 spa_ld_open_indirect_vdev_metadata(spa_t *spa) 2856 { 2857 int error = 0; 2858 vdev_t *rvd = spa->spa_root_vdev; 2859 2860 /* 2861 * Everything that we read before spa_remove_init() must be stored 2862 * on concreted vdevs. Therefore we do this as early as possible. 2863 */ 2864 error = spa_remove_init(spa); 2865 if (error != 0) { 2866 spa_load_failed(spa, "spa_remove_init failed [error=%d]", 2867 error); 2868 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2869 } 2870 2871 /* 2872 * Retrieve information needed to condense indirect vdev mappings. 2873 */ 2874 error = spa_condense_init(spa); 2875 if (error != 0) { 2876 spa_load_failed(spa, "spa_condense_init failed [error=%d]", 2877 error); 2878 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); 2879 } 2880 2881 return (0); 2882 } 2883 2884 static int 2885 spa_ld_check_features(spa_t *spa, boolean_t *missing_feat_writep) 2886 { 2887 int error = 0; 2888 vdev_t *rvd = spa->spa_root_vdev; 2889 2890 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2891 boolean_t missing_feat_read = B_FALSE; 2892 nvlist_t *unsup_feat, *enabled_feat; 2893 2894 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2895 &spa->spa_feat_for_read_obj, B_TRUE) != 0) { 2896 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2897 } 2898 2899 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2900 &spa->spa_feat_for_write_obj, B_TRUE) != 0) { 2901 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2902 } 2903 2904 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 2905 &spa->spa_feat_desc_obj, B_TRUE) != 0) { 2906 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2907 } 2908 2909 enabled_feat = fnvlist_alloc(); 2910 unsup_feat = fnvlist_alloc(); 2911 2912 if (!spa_features_check(spa, B_FALSE, 2913 unsup_feat, enabled_feat)) 2914 missing_feat_read = B_TRUE; 2915 2916 if (spa_writeable(spa) || 2917 spa->spa_load_state == SPA_LOAD_TRYIMPORT) { 2918 if (!spa_features_check(spa, B_TRUE, 2919 unsup_feat, enabled_feat)) { 2920 *missing_feat_writep = B_TRUE; 2921 } 2922 } 2923 2924 fnvlist_add_nvlist(spa->spa_load_info, 2925 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 2926 2927 if (!nvlist_empty(unsup_feat)) { 2928 fnvlist_add_nvlist(spa->spa_load_info, 2929 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 2930 } 2931 2932 fnvlist_free(enabled_feat); 2933 fnvlist_free(unsup_feat); 2934 2935 if (!missing_feat_read) { 2936 fnvlist_add_boolean(spa->spa_load_info, 2937 ZPOOL_CONFIG_CAN_RDONLY); 2938 } 2939 2940 /* 2941 * If the state is SPA_LOAD_TRYIMPORT, our objective is 2942 * twofold: to determine whether the pool is available for 2943 * import in read-write mode and (if it is not) whether the 2944 * pool is available for import in read-only mode. If the pool 2945 * is available for import in read-write mode, it is displayed 2946 * as available in userland; if it is not available for import 2947 * in read-only mode, it is displayed as unavailable in 2948 * userland. If the pool is available for import in read-only 2949 * mode but not read-write mode, it is displayed as unavailable 2950 * in userland with a special note that the pool is actually 2951 * available for open in read-only mode. 2952 * 2953 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 2954 * missing a feature for write, we must first determine whether 2955 * the pool can be opened read-only before returning to 2956 * userland in order to know whether to display the 2957 * abovementioned note. 2958 */ 2959 if (missing_feat_read || (*missing_feat_writep && 2960 spa_writeable(spa))) { 2961 spa_load_failed(spa, "pool uses unsupported features"); 2962 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2963 ENOTSUP)); 2964 } 2965 2966 /* 2967 * Load refcounts for ZFS features from disk into an in-memory 2968 * cache during SPA initialization. 2969 */ 2970 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 2971 uint64_t refcount; 2972 2973 error = feature_get_refcount_from_disk(spa, 2974 &spa_feature_table[i], &refcount); 2975 if (error == 0) { 2976 spa->spa_feat_refcount_cache[i] = refcount; 2977 } else if (error == ENOTSUP) { 2978 spa->spa_feat_refcount_cache[i] = 2979 SPA_FEATURE_DISABLED; 2980 } else { 2981 spa_load_failed(spa, "error getting refcount " 2982 "for feature %s [error=%d]", 2983 spa_feature_table[i].fi_guid, error); 2984 return (spa_vdev_err(rvd, 2985 VDEV_AUX_CORRUPT_DATA, EIO)); 2986 } 2987 } 2988 } 2989 2990 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 2991 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 2992 &spa->spa_feat_enabled_txg_obj, B_TRUE) != 0) 2993 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2994 } 2995 2996 return (0); 2997 } 2998 2999 static int 3000 spa_ld_load_special_directories(spa_t *spa) 3001 { 3002 int error = 0; 3003 vdev_t *rvd = spa->spa_root_vdev; 3004 3005 spa->spa_is_initializing = B_TRUE; 3006 error = dsl_pool_open(spa->spa_dsl_pool); 3007 spa->spa_is_initializing = B_FALSE; 3008 if (error != 0) { 3009 spa_load_failed(spa, "dsl_pool_open failed [error=%d]", error); 3010 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3011 } 3012 3013 return (0); 3014 } 3015 3016 static int 3017 spa_ld_get_props(spa_t *spa) 3018 { 3019 int error = 0; 3020 uint64_t obj; 3021 vdev_t *rvd = spa->spa_root_vdev; 3022 3023 /* Grab the secret checksum salt from the MOS. */ 3024 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 3025 DMU_POOL_CHECKSUM_SALT, 1, 3026 sizeof (spa->spa_cksum_salt.zcs_bytes), 3027 spa->spa_cksum_salt.zcs_bytes); 3028 if (error == ENOENT) { 3029 /* Generate a new salt for subsequent use */ 3030 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 3031 sizeof (spa->spa_cksum_salt.zcs_bytes)); 3032 } else if (error != 0) { 3033 spa_load_failed(spa, "unable to retrieve checksum salt from " 3034 "MOS [error=%d]", error); 3035 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3036 } 3037 3038 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj, B_TRUE) != 0) 3039 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3040 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 3041 if (error != 0) { 3042 spa_load_failed(spa, "error opening deferred-frees bpobj " 3043 "[error=%d]", error); 3044 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3045 } 3046 3047 /* 3048 * Load the bit that tells us to use the new accounting function 3049 * (raid-z deflation). If we have an older pool, this will not 3050 * be present. 3051 */ 3052 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate, B_FALSE); 3053 if (error != 0 && error != ENOENT) 3054 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3055 3056 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 3057 &spa->spa_creation_version, B_FALSE); 3058 if (error != 0 && error != ENOENT) 3059 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3060 3061 /* 3062 * Load the persistent error log. If we have an older pool, this will 3063 * not be present. 3064 */ 3065 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last, 3066 B_FALSE); 3067 if (error != 0 && error != ENOENT) 3068 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3069 3070 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 3071 &spa->spa_errlog_scrub, B_FALSE); 3072 if (error != 0 && error != ENOENT) 3073 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3074 3075 /* 3076 * Load the history object. If we have an older pool, this 3077 * will not be present. 3078 */ 3079 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history, B_FALSE); 3080 if (error != 0 && error != ENOENT) 3081 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3082 3083 /* 3084 * Load the per-vdev ZAP map. If we have an older pool, this will not 3085 * be present; in this case, defer its creation to a later time to 3086 * avoid dirtying the MOS this early / out of sync context. See 3087 * spa_sync_config_object. 3088 */ 3089 3090 /* The sentinel is only available in the MOS config. */ 3091 nvlist_t *mos_config; 3092 if (load_nvlist(spa, spa->spa_config_object, &mos_config) != 0) { 3093 spa_load_failed(spa, "unable to retrieve MOS config"); 3094 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3095 } 3096 3097 error = spa_dir_prop(spa, DMU_POOL_VDEV_ZAP_MAP, 3098 &spa->spa_all_vdev_zaps, B_FALSE); 3099 3100 if (error == ENOENT) { 3101 VERIFY(!nvlist_exists(mos_config, 3102 ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); 3103 spa->spa_avz_action = AVZ_ACTION_INITIALIZE; 3104 ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); 3105 } else if (error != 0) { 3106 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3107 } else if (!nvlist_exists(mos_config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)) { 3108 /* 3109 * An older version of ZFS overwrote the sentinel value, so 3110 * we have orphaned per-vdev ZAPs in the MOS. Defer their 3111 * destruction to later; see spa_sync_config_object. 3112 */ 3113 spa->spa_avz_action = AVZ_ACTION_DESTROY; 3114 /* 3115 * We're assuming that no vdevs have had their ZAPs created 3116 * before this. Better be sure of it. 3117 */ 3118 ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); 3119 } 3120 nvlist_free(mos_config); 3121 3122 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3123 3124 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object, 3125 B_FALSE); 3126 if (error && error != ENOENT) 3127 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3128 3129 if (error == 0) { 3130 uint64_t autoreplace; 3131 3132 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 3133 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 3134 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 3135 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 3136 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 3137 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 3138 &spa->spa_dedup_ditto); 3139 3140 spa->spa_autoreplace = (autoreplace != 0); 3141 } 3142 3143 /* 3144 * If we are importing a pool with missing top-level vdevs, 3145 * we enforce that the pool doesn't panic or get suspended on 3146 * error since the likelihood of missing data is extremely high. 3147 */ 3148 if (spa->spa_missing_tvds > 0 && 3149 spa->spa_failmode != ZIO_FAILURE_MODE_CONTINUE && 3150 spa->spa_load_state != SPA_LOAD_TRYIMPORT) { 3151 spa_load_note(spa, "forcing failmode to 'continue' " 3152 "as some top level vdevs are missing"); 3153 spa->spa_failmode = ZIO_FAILURE_MODE_CONTINUE; 3154 } 3155 3156 return (0); 3157 } 3158 3159 static int 3160 spa_ld_open_aux_vdevs(spa_t *spa, spa_import_type_t type) 3161 { 3162 int error = 0; 3163 vdev_t *rvd = spa->spa_root_vdev; 3164 3165 /* 3166 * If we're assembling the pool from the split-off vdevs of 3167 * an existing pool, we don't want to attach the spares & cache 3168 * devices. 3169 */ 3170 3171 /* 3172 * Load any hot spares for this pool. 3173 */ 3174 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object, 3175 B_FALSE); 3176 if (error != 0 && error != ENOENT) 3177 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3178 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 3179 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 3180 if (load_nvlist(spa, spa->spa_spares.sav_object, 3181 &spa->spa_spares.sav_config) != 0) { 3182 spa_load_failed(spa, "error loading spares nvlist"); 3183 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3184 } 3185 3186 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3187 spa_load_spares(spa); 3188 spa_config_exit(spa, SCL_ALL, FTAG); 3189 } else if (error == 0) { 3190 spa->spa_spares.sav_sync = B_TRUE; 3191 } 3192 3193 /* 3194 * Load any level 2 ARC devices for this pool. 3195 */ 3196 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 3197 &spa->spa_l2cache.sav_object, B_FALSE); 3198 if (error != 0 && error != ENOENT) 3199 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3200 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 3201 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 3202 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 3203 &spa->spa_l2cache.sav_config) != 0) { 3204 spa_load_failed(spa, "error loading l2cache nvlist"); 3205 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3206 } 3207 3208 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3209 spa_load_l2cache(spa); 3210 spa_config_exit(spa, SCL_ALL, FTAG); 3211 } else if (error == 0) { 3212 spa->spa_l2cache.sav_sync = B_TRUE; 3213 } 3214 3215 return (0); 3216 } 3217 3218 static int 3219 spa_ld_load_vdev_metadata(spa_t *spa) 3220 { 3221 int error = 0; 3222 vdev_t *rvd = spa->spa_root_vdev; 3223 3224 /* 3225 * If the 'autoreplace' property is set, then post a resource notifying 3226 * the ZFS DE that it should not issue any faults for unopenable 3227 * devices. We also iterate over the vdevs, and post a sysevent for any 3228 * unopenable vdevs so that the normal autoreplace handler can take 3229 * over. 3230 */ 3231 if (spa->spa_autoreplace && spa->spa_load_state != SPA_LOAD_TRYIMPORT) { 3232 spa_check_removed(spa->spa_root_vdev); 3233 /* 3234 * For the import case, this is done in spa_import(), because 3235 * at this point we're using the spare definitions from 3236 * the MOS config, not necessarily from the userland config. 3237 */ 3238 if (spa->spa_load_state != SPA_LOAD_IMPORT) { 3239 spa_aux_check_removed(&spa->spa_spares); 3240 spa_aux_check_removed(&spa->spa_l2cache); 3241 } 3242 } 3243 3244 /* 3245 * Load the vdev metadata such as metaslabs, DTLs, spacemap object, etc. 3246 */ 3247 error = vdev_load(rvd); 3248 if (error != 0) { 3249 spa_load_failed(spa, "vdev_load failed [error=%d]", error); 3250 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); 3251 } 3252 3253 /* 3254 * Propagate the leaf DTLs we just loaded all the way up the vdev tree. 3255 */ 3256 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3257 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 3258 spa_config_exit(spa, SCL_ALL, FTAG); 3259 3260 return (0); 3261 } 3262 3263 static int 3264 spa_ld_load_dedup_tables(spa_t *spa) 3265 { 3266 int error = 0; 3267 vdev_t *rvd = spa->spa_root_vdev; 3268 3269 error = ddt_load(spa); 3270 if (error != 0) { 3271 spa_load_failed(spa, "ddt_load failed [error=%d]", error); 3272 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 3273 } 3274 3275 return (0); 3276 } 3277 3278 static int 3279 spa_ld_verify_logs(spa_t *spa, spa_import_type_t type, char **ereport) 3280 { 3281 vdev_t *rvd = spa->spa_root_vdev; 3282 3283 if (type != SPA_IMPORT_ASSEMBLE && spa_writeable(spa)) { 3284 boolean_t missing = spa_check_logs(spa); 3285 if (missing) { 3286 if (spa->spa_missing_tvds != 0) { 3287 spa_load_note(spa, "spa_check_logs failed " 3288 "so dropping the logs"); 3289 } else { 3290 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 3291 spa_load_failed(spa, "spa_check_logs failed"); 3292 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, 3293 ENXIO)); 3294 } 3295 } 3296 } 3297 3298 return (0); 3299 } 3300 3301 static int 3302 spa_ld_verify_pool_data(spa_t *spa) 3303 { 3304 int error = 0; 3305 vdev_t *rvd = spa->spa_root_vdev; 3306 3307 /* 3308 * We've successfully opened the pool, verify that we're ready 3309 * to start pushing transactions. 3310 */ 3311 if (spa->spa_load_state != SPA_LOAD_TRYIMPORT) { 3312 error = spa_load_verify(spa); 3313 if (error != 0) { 3314 spa_load_failed(spa, "spa_load_verify failed " 3315 "[error=%d]", error); 3316 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 3317 error)); 3318 } 3319 } 3320 3321 return (0); 3322 } 3323 3324 static void 3325 spa_ld_claim_log_blocks(spa_t *spa) 3326 { 3327 dmu_tx_t *tx; 3328 dsl_pool_t *dp = spa_get_dsl(spa); 3329 3330 /* 3331 * Claim log blocks that haven't been committed yet. 3332 * This must all happen in a single txg. 3333 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 3334 * invoked from zil_claim_log_block()'s i/o done callback. 3335 * Price of rollback is that we abandon the log. 3336 */ 3337 spa->spa_claiming = B_TRUE; 3338 3339 tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); 3340 (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 3341 zil_claim, tx, DS_FIND_CHILDREN); 3342 dmu_tx_commit(tx); 3343 3344 spa->spa_claiming = B_FALSE; 3345 3346 spa_set_log_state(spa, SPA_LOG_GOOD); 3347 } 3348 3349 static void 3350 spa_ld_check_for_config_update(spa_t *spa, uint64_t config_cache_txg, 3351 boolean_t update_config_cache) 3352 { 3353 vdev_t *rvd = spa->spa_root_vdev; 3354 int need_update = B_FALSE; 3355 3356 /* 3357 * If the config cache is stale, or we have uninitialized 3358 * metaslabs (see spa_vdev_add()), then update the config. 3359 * 3360 * If this is a verbatim import, trust the current 3361 * in-core spa_config and update the disk labels. 3362 */ 3363 if (update_config_cache || config_cache_txg != spa->spa_config_txg || 3364 spa->spa_load_state == SPA_LOAD_IMPORT || 3365 spa->spa_load_state == SPA_LOAD_RECOVER || 3366 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 3367 need_update = B_TRUE; 3368 3369 for (int c = 0; c < rvd->vdev_children; c++) 3370 if (rvd->vdev_child[c]->vdev_ms_array == 0) 3371 need_update = B_TRUE; 3372 3373 /* 3374 * Update the config cache asychronously in case we're the 3375 * root pool, in which case the config cache isn't writable yet. 3376 */ 3377 if (need_update) 3378 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 3379 } 3380 3381 static void 3382 spa_ld_prepare_for_reload(spa_t *spa) 3383 { 3384 int mode = spa->spa_mode; 3385 int async_suspended = spa->spa_async_suspended; 3386 3387 spa_unload(spa); 3388 spa_deactivate(spa); 3389 spa_activate(spa, mode); 3390 3391 /* 3392 * We save the value of spa_async_suspended as it gets reset to 0 by 3393 * spa_unload(). We want to restore it back to the original value before 3394 * returning as we might be calling spa_async_resume() later. 3395 */ 3396 spa->spa_async_suspended = async_suspended; 3397 } 3398 3399 static int 3400 spa_ld_read_checkpoint_txg(spa_t *spa) 3401 { 3402 uberblock_t checkpoint; 3403 int error = 0; 3404 3405 ASSERT0(spa->spa_checkpoint_txg); 3406 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3407 3408 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 3409 DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t), 3410 sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint); 3411 3412 if (error == ENOENT) 3413 return (0); 3414 3415 if (error != 0) 3416 return (error); 3417 3418 ASSERT3U(checkpoint.ub_txg, !=, 0); 3419 ASSERT3U(checkpoint.ub_checkpoint_txg, !=, 0); 3420 ASSERT3U(checkpoint.ub_timestamp, !=, 0); 3421 spa->spa_checkpoint_txg = checkpoint.ub_txg; 3422 spa->spa_checkpoint_info.sci_timestamp = checkpoint.ub_timestamp; 3423 3424 return (0); 3425 } 3426 3427 static int 3428 spa_ld_mos_init(spa_t *spa, spa_import_type_t type) 3429 { 3430 int error = 0; 3431 3432 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3433 ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE); 3434 3435 /* 3436 * Never trust the config that is provided unless we are assembling 3437 * a pool following a split. 3438 * This means don't trust blkptrs and the vdev tree in general. This 3439 * also effectively puts the spa in read-only mode since 3440 * spa_writeable() checks for spa_trust_config to be true. 3441 * We will later load a trusted config from the MOS. 3442 */ 3443 if (type != SPA_IMPORT_ASSEMBLE) 3444 spa->spa_trust_config = B_FALSE; 3445 3446 /* 3447 * Parse the config provided to create a vdev tree. 3448 */ 3449 error = spa_ld_parse_config(spa, type); 3450 if (error != 0) 3451 return (error); 3452 3453 /* 3454 * Now that we have the vdev tree, try to open each vdev. This involves 3455 * opening the underlying physical device, retrieving its geometry and 3456 * probing the vdev with a dummy I/O. The state of each vdev will be set 3457 * based on the success of those operations. After this we'll be ready 3458 * to read from the vdevs. 3459 */ 3460 error = spa_ld_open_vdevs(spa); 3461 if (error != 0) 3462 return (error); 3463 3464 /* 3465 * Read the label of each vdev and make sure that the GUIDs stored 3466 * there match the GUIDs in the config provided. 3467 * If we're assembling a new pool that's been split off from an 3468 * existing pool, the labels haven't yet been updated so we skip 3469 * validation for now. 3470 */ 3471 if (type != SPA_IMPORT_ASSEMBLE) { 3472 error = spa_ld_validate_vdevs(spa); 3473 if (error != 0) 3474 return (error); 3475 } 3476 3477 /* 3478 * Read all vdev labels to find the best uberblock (i.e. latest, 3479 * unless spa_load_max_txg is set) and store it in spa_uberblock. We 3480 * get the list of features required to read blkptrs in the MOS from 3481 * the vdev label with the best uberblock and verify that our version 3482 * of zfs supports them all. 3483 */ 3484 error = spa_ld_select_uberblock(spa, type); 3485 if (error != 0) 3486 return (error); 3487 3488 /* 3489 * Pass that uberblock to the dsl_pool layer which will open the root 3490 * blkptr. This blkptr points to the latest version of the MOS and will 3491 * allow us to read its contents. 3492 */ 3493 error = spa_ld_open_rootbp(spa); 3494 if (error != 0) 3495 return (error); 3496 3497 return (0); 3498 } 3499 3500 static int 3501 spa_ld_checkpoint_rewind(spa_t *spa) 3502 { 3503 uberblock_t checkpoint; 3504 int error = 0; 3505 3506 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3507 ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); 3508 3509 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 3510 DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t), 3511 sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint); 3512 3513 if (error != 0) { 3514 spa_load_failed(spa, "unable to retrieve checkpointed " 3515 "uberblock from the MOS config [error=%d]", error); 3516 3517 if (error == ENOENT) 3518 error = ZFS_ERR_NO_CHECKPOINT; 3519 3520 return (error); 3521 } 3522 3523 ASSERT3U(checkpoint.ub_txg, <, spa->spa_uberblock.ub_txg); 3524 ASSERT3U(checkpoint.ub_txg, ==, checkpoint.ub_checkpoint_txg); 3525 3526 /* 3527 * We need to update the txg and timestamp of the checkpointed 3528 * uberblock to be higher than the latest one. This ensures that 3529 * the checkpointed uberblock is selected if we were to close and 3530 * reopen the pool right after we've written it in the vdev labels. 3531 * (also see block comment in vdev_uberblock_compare) 3532 */ 3533 checkpoint.ub_txg = spa->spa_uberblock.ub_txg + 1; 3534 checkpoint.ub_timestamp = gethrestime_sec(); 3535 3536 /* 3537 * Set current uberblock to be the checkpointed uberblock. 3538 */ 3539 spa->spa_uberblock = checkpoint; 3540 3541 /* 3542 * If we are doing a normal rewind, then the pool is open for 3543 * writing and we sync the "updated" checkpointed uberblock to 3544 * disk. Once this is done, we've basically rewound the whole 3545 * pool and there is no way back. 3546 * 3547 * There are cases when we don't want to attempt and sync the 3548 * checkpointed uberblock to disk because we are opening a 3549 * pool as read-only. Specifically, verifying the checkpointed 3550 * state with zdb, and importing the checkpointed state to get 3551 * a "preview" of its content. 3552 */ 3553 if (spa_writeable(spa)) { 3554 vdev_t *rvd = spa->spa_root_vdev; 3555 3556 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3557 vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL }; 3558 int svdcount = 0; 3559 int children = rvd->vdev_children; 3560 int c0 = spa_get_random(children); 3561 3562 for (int c = 0; c < children; c++) { 3563 vdev_t *vd = rvd->vdev_child[(c0 + c) % children]; 3564 3565 /* Stop when revisiting the first vdev */ 3566 if (c > 0 && svd[0] == vd) 3567 break; 3568 3569 if (vd->vdev_ms_array == 0 || vd->vdev_islog || 3570 !vdev_is_concrete(vd)) 3571 continue; 3572 3573 svd[svdcount++] = vd; 3574 if (svdcount == SPA_SYNC_MIN_VDEVS) 3575 break; 3576 } 3577 error = vdev_config_sync(svd, svdcount, spa->spa_first_txg); 3578 if (error == 0) 3579 spa->spa_last_synced_guid = rvd->vdev_guid; 3580 spa_config_exit(spa, SCL_ALL, FTAG); 3581 3582 if (error != 0) { 3583 spa_load_failed(spa, "failed to write checkpointed " 3584 "uberblock to the vdev labels [error=%d]", error); 3585 return (error); 3586 } 3587 } 3588 3589 return (0); 3590 } 3591 3592 static int 3593 spa_ld_mos_with_trusted_config(spa_t *spa, spa_import_type_t type, 3594 boolean_t *update_config_cache) 3595 { 3596 int error; 3597 3598 /* 3599 * Parse the config for pool, open and validate vdevs, 3600 * select an uberblock, and use that uberblock to open 3601 * the MOS. 3602 */ 3603 error = spa_ld_mos_init(spa, type); 3604 if (error != 0) 3605 return (error); 3606 3607 /* 3608 * Retrieve the trusted config stored in the MOS and use it to create 3609 * a new, exact version of the vdev tree, then reopen all vdevs. 3610 */ 3611 error = spa_ld_trusted_config(spa, type, B_FALSE); 3612 if (error == EAGAIN) { 3613 if (update_config_cache != NULL) 3614 *update_config_cache = B_TRUE; 3615 3616 /* 3617 * Redo the loading process with the trusted config if it is 3618 * too different from the untrusted config. 3619 */ 3620 spa_ld_prepare_for_reload(spa); 3621 spa_load_note(spa, "RELOADING"); 3622 error = spa_ld_mos_init(spa, type); 3623 if (error != 0) 3624 return (error); 3625 3626 error = spa_ld_trusted_config(spa, type, B_TRUE); 3627 if (error != 0) 3628 return (error); 3629 3630 } else if (error != 0) { 3631 return (error); 3632 } 3633 3634 return (0); 3635 } 3636 3637 /* 3638 * Load an existing storage pool, using the config provided. This config 3639 * describes which vdevs are part of the pool and is later validated against 3640 * partial configs present in each vdev's label and an entire copy of the 3641 * config stored in the MOS. 3642 */ 3643 static int 3644 spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport) 3645 { 3646 int error = 0; 3647 boolean_t missing_feat_write = B_FALSE; 3648 boolean_t checkpoint_rewind = 3649 (spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); 3650 boolean_t update_config_cache = B_FALSE; 3651 3652 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 3653 ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE); 3654 3655 spa_load_note(spa, "LOADING"); 3656 3657 error = spa_ld_mos_with_trusted_config(spa, type, &update_config_cache); 3658 if (error != 0) 3659 return (error); 3660 3661 /* 3662 * If we are rewinding to the checkpoint then we need to repeat 3663 * everything we've done so far in this function but this time 3664 * selecting the checkpointed uberblock and using that to open 3665 * the MOS. 3666 */ 3667 if (checkpoint_rewind) { 3668 /* 3669 * If we are rewinding to the checkpoint update config cache 3670 * anyway. 3671 */ 3672 update_config_cache = B_TRUE; 3673 3674 /* 3675 * Extract the checkpointed uberblock from the current MOS 3676 * and use this as the pool's uberblock from now on. If the 3677 * pool is imported as writeable we also write the checkpoint 3678 * uberblock to the labels, making the rewind permanent. 3679 */ 3680 error = spa_ld_checkpoint_rewind(spa); 3681 if (error != 0) 3682 return (error); 3683 3684 /* 3685 * Redo the loading process process again with the 3686 * checkpointed uberblock. 3687 */ 3688 spa_ld_prepare_for_reload(spa); 3689 spa_load_note(spa, "LOADING checkpointed uberblock"); 3690 error = spa_ld_mos_with_trusted_config(spa, type, NULL); 3691 if (error != 0) 3692 return (error); 3693 } 3694 3695 /* 3696 * Retrieve the checkpoint txg if the pool has a checkpoint. 3697 */ 3698 error = spa_ld_read_checkpoint_txg(spa); 3699 if (error != 0) 3700 return (error); 3701 3702 /* 3703 * Retrieve the mapping of indirect vdevs. Those vdevs were removed 3704 * from the pool and their contents were re-mapped to other vdevs. Note 3705 * that everything that we read before this step must have been 3706 * rewritten on concrete vdevs after the last device removal was 3707 * initiated. Otherwise we could be reading from indirect vdevs before 3708 * we have loaded their mappings. 3709 */ 3710 error = spa_ld_open_indirect_vdev_metadata(spa); 3711 if (error != 0) 3712 return (error); 3713 3714 /* 3715 * Retrieve the full list of active features from the MOS and check if 3716 * they are all supported. 3717 */ 3718 error = spa_ld_check_features(spa, &missing_feat_write); 3719 if (error != 0) 3720 return (error); 3721 3722 /* 3723 * Load several special directories from the MOS needed by the dsl_pool 3724 * layer. 3725 */ 3726 error = spa_ld_load_special_directories(spa); 3727 if (error != 0) 3728 return (error); 3729 3730 /* 3731 * Retrieve pool properties from the MOS. 3732 */ 3733 error = spa_ld_get_props(spa); 3734 if (error != 0) 3735 return (error); 3736 3737 /* 3738 * Retrieve the list of auxiliary devices - cache devices and spares - 3739 * and open them. 3740 */ 3741 error = spa_ld_open_aux_vdevs(spa, type); 3742 if (error != 0) 3743 return (error); 3744 3745 /* 3746 * Load the metadata for all vdevs. Also check if unopenable devices 3747 * should be autoreplaced. 3748 */ 3749 error = spa_ld_load_vdev_metadata(spa); 3750 if (error != 0) 3751 return (error); 3752 3753 error = spa_ld_load_dedup_tables(spa); 3754 if (error != 0) 3755 return (error); 3756 3757 /* 3758 * Verify the logs now to make sure we don't have any unexpected errors 3759 * when we claim log blocks later. 3760 */ 3761 error = spa_ld_verify_logs(spa, type, ereport); 3762 if (error != 0) 3763 return (error); 3764 3765 if (missing_feat_write) { 3766 ASSERT(spa->spa_load_state == SPA_LOAD_TRYIMPORT); 3767 3768 /* 3769 * At this point, we know that we can open the pool in 3770 * read-only mode but not read-write mode. We now have enough 3771 * information and can return to userland. 3772 */ 3773 return (spa_vdev_err(spa->spa_root_vdev, VDEV_AUX_UNSUP_FEAT, 3774 ENOTSUP)); 3775 } 3776 3777 /* 3778 * Traverse the last txgs to make sure the pool was left off in a safe 3779 * state. When performing an extreme rewind, we verify the whole pool, 3780 * which can take a very long time. 3781 */ 3782 error = spa_ld_verify_pool_data(spa); 3783 if (error != 0) 3784 return (error); 3785 3786 /* 3787 * Calculate the deflated space for the pool. This must be done before 3788 * we write anything to the pool because we'd need to update the space 3789 * accounting using the deflated sizes. 3790 */ 3791 spa_update_dspace(spa); 3792 3793 /* 3794 * We have now retrieved all the information we needed to open the 3795 * pool. If we are importing the pool in read-write mode, a few 3796 * additional steps must be performed to finish the import. 3797 */ 3798 if (spa_writeable(spa) && (spa->spa_load_state == SPA_LOAD_RECOVER || 3799 spa->spa_load_max_txg == UINT64_MAX)) { 3800 uint64_t config_cache_txg = spa->spa_config_txg; 3801 3802 ASSERT(spa->spa_load_state != SPA_LOAD_TRYIMPORT); 3803 3804 /* 3805 * In case of a checkpoint rewind, log the original txg 3806 * of the checkpointed uberblock. 3807 */ 3808 if (checkpoint_rewind) { 3809 spa_history_log_internal(spa, "checkpoint rewind", 3810 NULL, "rewound state to txg=%llu", 3811 (u_longlong_t)spa->spa_uberblock.ub_checkpoint_txg); 3812 } 3813 3814 /* 3815 * Traverse the ZIL and claim all blocks. 3816 */ 3817 spa_ld_claim_log_blocks(spa); 3818 3819 /* 3820 * Kick-off the syncing thread. 3821 */ 3822 spa->spa_sync_on = B_TRUE; 3823 txg_sync_start(spa->spa_dsl_pool); 3824 3825 /* 3826 * Wait for all claims to sync. We sync up to the highest 3827 * claimed log block birth time so that claimed log blocks 3828 * don't appear to be from the future. spa_claim_max_txg 3829 * will have been set for us by ZIL traversal operations 3830 * performed above. 3831 */ 3832 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 3833 3834 /* 3835 * Check if we need to request an update of the config. On the 3836 * next sync, we would update the config stored in vdev labels 3837 * and the cachefile (by default /etc/zfs/zpool.cache). 3838 */ 3839 spa_ld_check_for_config_update(spa, config_cache_txg, 3840 update_config_cache); 3841 3842 /* 3843 * Check all DTLs to see if anything needs resilvering. 3844 */ 3845 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 3846 vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) 3847 spa_async_request(spa, SPA_ASYNC_RESILVER); 3848 3849 /* 3850 * Log the fact that we booted up (so that we can detect if 3851 * we rebooted in the middle of an operation). 3852 */ 3853 spa_history_log_version(spa, "open"); 3854 3855 /* 3856 * Delete any inconsistent datasets. 3857 */ 3858 (void) dmu_objset_find(spa_name(spa), 3859 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 3860 3861 /* 3862 * Clean up any stale temporary dataset userrefs. 3863 */ 3864 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 3865 3866 spa_restart_removal(spa); 3867 3868 spa_spawn_aux_threads(spa); 3869 } 3870 3871 spa_load_note(spa, "LOADED"); 3872 3873 return (0); 3874 } 3875 3876 static int 3877 spa_load_retry(spa_t *spa, spa_load_state_t state) 3878 { 3879 int mode = spa->spa_mode; 3880 3881 spa_unload(spa); 3882 spa_deactivate(spa); 3883 3884 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 3885 3886 spa_activate(spa, mode); 3887 spa_async_suspend(spa); 3888 3889 spa_load_note(spa, "spa_load_retry: rewind, max txg: %llu", 3890 (u_longlong_t)spa->spa_load_max_txg); 3891 3892 return (spa_load(spa, state, SPA_IMPORT_EXISTING)); 3893 } 3894 3895 /* 3896 * If spa_load() fails this function will try loading prior txg's. If 3897 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 3898 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 3899 * function will not rewind the pool and will return the same error as 3900 * spa_load(). 3901 */ 3902 static int 3903 spa_load_best(spa_t *spa, spa_load_state_t state, uint64_t max_request, 3904 int rewind_flags) 3905 { 3906 nvlist_t *loadinfo = NULL; 3907 nvlist_t *config = NULL; 3908 int load_error, rewind_error; 3909 uint64_t safe_rewind_txg; 3910 uint64_t min_txg; 3911 3912 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 3913 spa->spa_load_max_txg = spa->spa_load_txg; 3914 spa_set_log_state(spa, SPA_LOG_CLEAR); 3915 } else { 3916 spa->spa_load_max_txg = max_request; 3917 if (max_request != UINT64_MAX) 3918 spa->spa_extreme_rewind = B_TRUE; 3919 } 3920 3921 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING); 3922 if (load_error == 0) 3923 return (0); 3924 if (load_error == ZFS_ERR_NO_CHECKPOINT) { 3925 /* 3926 * When attempting checkpoint-rewind on a pool with no 3927 * checkpoint, we should not attempt to load uberblocks 3928 * from previous txgs when spa_load fails. 3929 */ 3930 ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); 3931 return (load_error); 3932 } 3933 3934 if (spa->spa_root_vdev != NULL) 3935 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 3936 3937 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 3938 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 3939 3940 if (rewind_flags & ZPOOL_NEVER_REWIND) { 3941 nvlist_free(config); 3942 return (load_error); 3943 } 3944 3945 if (state == SPA_LOAD_RECOVER) { 3946 /* Price of rolling back is discarding txgs, including log */ 3947 spa_set_log_state(spa, SPA_LOG_CLEAR); 3948 } else { 3949 /* 3950 * If we aren't rolling back save the load info from our first 3951 * import attempt so that we can restore it after attempting 3952 * to rewind. 3953 */ 3954 loadinfo = spa->spa_load_info; 3955 spa->spa_load_info = fnvlist_alloc(); 3956 } 3957 3958 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 3959 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 3960 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 3961 TXG_INITIAL : safe_rewind_txg; 3962 3963 /* 3964 * Continue as long as we're finding errors, we're still within 3965 * the acceptable rewind range, and we're still finding uberblocks 3966 */ 3967 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 3968 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 3969 if (spa->spa_load_max_txg < safe_rewind_txg) 3970 spa->spa_extreme_rewind = B_TRUE; 3971 rewind_error = spa_load_retry(spa, state); 3972 } 3973 3974 spa->spa_extreme_rewind = B_FALSE; 3975 spa->spa_load_max_txg = UINT64_MAX; 3976 3977 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 3978 spa_config_set(spa, config); 3979 else 3980 nvlist_free(config); 3981 3982 if (state == SPA_LOAD_RECOVER) { 3983 ASSERT3P(loadinfo, ==, NULL); 3984 return (rewind_error); 3985 } else { 3986 /* Store the rewind info as part of the initial load info */ 3987 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 3988 spa->spa_load_info); 3989 3990 /* Restore the initial load info */ 3991 fnvlist_free(spa->spa_load_info); 3992 spa->spa_load_info = loadinfo; 3993 3994 return (load_error); 3995 } 3996 } 3997 3998 /* 3999 * Pool Open/Import 4000 * 4001 * The import case is identical to an open except that the configuration is sent 4002 * down from userland, instead of grabbed from the configuration cache. For the 4003 * case of an open, the pool configuration will exist in the 4004 * POOL_STATE_UNINITIALIZED state. 4005 * 4006 * The stats information (gen/count/ustats) is used to gather vdev statistics at 4007 * the same time open the pool, without having to keep around the spa_t in some 4008 * ambiguous state. 4009 */ 4010 static int 4011 spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 4012 nvlist_t **config) 4013 { 4014 spa_t *spa; 4015 spa_load_state_t state = SPA_LOAD_OPEN; 4016 int error; 4017 int locked = B_FALSE; 4018 4019 *spapp = NULL; 4020 4021 /* 4022 * As disgusting as this is, we need to support recursive calls to this 4023 * function because dsl_dir_open() is called during spa_load(), and ends 4024 * up calling spa_open() again. The real fix is to figure out how to 4025 * avoid dsl_dir_open() calling this in the first place. 4026 */ 4027 if (mutex_owner(&spa_namespace_lock) != curthread) { 4028 mutex_enter(&spa_namespace_lock); 4029 locked = B_TRUE; 4030 } 4031 4032 if ((spa = spa_lookup(pool)) == NULL) { 4033 if (locked) 4034 mutex_exit(&spa_namespace_lock); 4035 return (SET_ERROR(ENOENT)); 4036 } 4037 4038 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 4039 zpool_load_policy_t policy; 4040 4041 zpool_get_load_policy(nvpolicy ? nvpolicy : spa->spa_config, 4042 &policy); 4043 if (policy.zlp_rewind & ZPOOL_DO_REWIND) 4044 state = SPA_LOAD_RECOVER; 4045 4046 spa_activate(spa, spa_mode_global); 4047 4048 if (state != SPA_LOAD_RECOVER) 4049 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4050 spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE; 4051 4052 zfs_dbgmsg("spa_open_common: opening %s", pool); 4053 error = spa_load_best(spa, state, policy.zlp_txg, 4054 policy.zlp_rewind); 4055 4056 if (error == EBADF) { 4057 /* 4058 * If vdev_validate() returns failure (indicated by 4059 * EBADF), it indicates that one of the vdevs indicates 4060 * that the pool has been exported or destroyed. If 4061 * this is the case, the config cache is out of sync and 4062 * we should remove the pool from the namespace. 4063 */ 4064 spa_unload(spa); 4065 spa_deactivate(spa); 4066 spa_write_cachefile(spa, B_TRUE, B_TRUE); 4067 spa_remove(spa); 4068 if (locked) 4069 mutex_exit(&spa_namespace_lock); 4070 return (SET_ERROR(ENOENT)); 4071 } 4072 4073 if (error) { 4074 /* 4075 * We can't open the pool, but we still have useful 4076 * information: the state of each vdev after the 4077 * attempted vdev_open(). Return this to the user. 4078 */ 4079 if (config != NULL && spa->spa_config) { 4080 VERIFY(nvlist_dup(spa->spa_config, config, 4081 KM_SLEEP) == 0); 4082 VERIFY(nvlist_add_nvlist(*config, 4083 ZPOOL_CONFIG_LOAD_INFO, 4084 spa->spa_load_info) == 0); 4085 } 4086 spa_unload(spa); 4087 spa_deactivate(spa); 4088 spa->spa_last_open_failed = error; 4089 if (locked) 4090 mutex_exit(&spa_namespace_lock); 4091 *spapp = NULL; 4092 return (error); 4093 } 4094 } 4095 4096 spa_open_ref(spa, tag); 4097 4098 if (config != NULL) 4099 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4100 4101 /* 4102 * If we've recovered the pool, pass back any information we 4103 * gathered while doing the load. 4104 */ 4105 if (state == SPA_LOAD_RECOVER) { 4106 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 4107 spa->spa_load_info) == 0); 4108 } 4109 4110 if (locked) { 4111 spa->spa_last_open_failed = 0; 4112 spa->spa_last_ubsync_txg = 0; 4113 spa->spa_load_txg = 0; 4114 mutex_exit(&spa_namespace_lock); 4115 } 4116 4117 *spapp = spa; 4118 4119 return (0); 4120 } 4121 4122 int 4123 spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 4124 nvlist_t **config) 4125 { 4126 return (spa_open_common(name, spapp, tag, policy, config)); 4127 } 4128 4129 int 4130 spa_open(const char *name, spa_t **spapp, void *tag) 4131 { 4132 return (spa_open_common(name, spapp, tag, NULL, NULL)); 4133 } 4134 4135 /* 4136 * Lookup the given spa_t, incrementing the inject count in the process, 4137 * preventing it from being exported or destroyed. 4138 */ 4139 spa_t * 4140 spa_inject_addref(char *name) 4141 { 4142 spa_t *spa; 4143 4144 mutex_enter(&spa_namespace_lock); 4145 if ((spa = spa_lookup(name)) == NULL) { 4146 mutex_exit(&spa_namespace_lock); 4147 return (NULL); 4148 } 4149 spa->spa_inject_ref++; 4150 mutex_exit(&spa_namespace_lock); 4151 4152 return (spa); 4153 } 4154 4155 void 4156 spa_inject_delref(spa_t *spa) 4157 { 4158 mutex_enter(&spa_namespace_lock); 4159 spa->spa_inject_ref--; 4160 mutex_exit(&spa_namespace_lock); 4161 } 4162 4163 /* 4164 * Add spares device information to the nvlist. 4165 */ 4166 static void 4167 spa_add_spares(spa_t *spa, nvlist_t *config) 4168 { 4169 nvlist_t **spares; 4170 uint_t i, nspares; 4171 nvlist_t *nvroot; 4172 uint64_t guid; 4173 vdev_stat_t *vs; 4174 uint_t vsc; 4175 uint64_t pool; 4176 4177 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 4178 4179 if (spa->spa_spares.sav_count == 0) 4180 return; 4181 4182 VERIFY(nvlist_lookup_nvlist(config, 4183 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 4184 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 4185 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 4186 if (nspares != 0) { 4187 VERIFY(nvlist_add_nvlist_array(nvroot, 4188 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4189 VERIFY(nvlist_lookup_nvlist_array(nvroot, 4190 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 4191 4192 /* 4193 * Go through and find any spares which have since been 4194 * repurposed as an active spare. If this is the case, update 4195 * their status appropriately. 4196 */ 4197 for (i = 0; i < nspares; i++) { 4198 VERIFY(nvlist_lookup_uint64(spares[i], 4199 ZPOOL_CONFIG_GUID, &guid) == 0); 4200 if (spa_spare_exists(guid, &pool, NULL) && 4201 pool != 0ULL) { 4202 VERIFY(nvlist_lookup_uint64_array( 4203 spares[i], ZPOOL_CONFIG_VDEV_STATS, 4204 (uint64_t **)&vs, &vsc) == 0); 4205 vs->vs_state = VDEV_STATE_CANT_OPEN; 4206 vs->vs_aux = VDEV_AUX_SPARED; 4207 } 4208 } 4209 } 4210 } 4211 4212 /* 4213 * Add l2cache device information to the nvlist, including vdev stats. 4214 */ 4215 static void 4216 spa_add_l2cache(spa_t *spa, nvlist_t *config) 4217 { 4218 nvlist_t **l2cache; 4219 uint_t i, j, nl2cache; 4220 nvlist_t *nvroot; 4221 uint64_t guid; 4222 vdev_t *vd; 4223 vdev_stat_t *vs; 4224 uint_t vsc; 4225 4226 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 4227 4228 if (spa->spa_l2cache.sav_count == 0) 4229 return; 4230 4231 VERIFY(nvlist_lookup_nvlist(config, 4232 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 4233 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 4234 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 4235 if (nl2cache != 0) { 4236 VERIFY(nvlist_add_nvlist_array(nvroot, 4237 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4238 VERIFY(nvlist_lookup_nvlist_array(nvroot, 4239 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 4240 4241 /* 4242 * Update level 2 cache device stats. 4243 */ 4244 4245 for (i = 0; i < nl2cache; i++) { 4246 VERIFY(nvlist_lookup_uint64(l2cache[i], 4247 ZPOOL_CONFIG_GUID, &guid) == 0); 4248 4249 vd = NULL; 4250 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 4251 if (guid == 4252 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 4253 vd = spa->spa_l2cache.sav_vdevs[j]; 4254 break; 4255 } 4256 } 4257 ASSERT(vd != NULL); 4258 4259 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 4260 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 4261 == 0); 4262 vdev_get_stats(vd, vs); 4263 } 4264 } 4265 } 4266 4267 static void 4268 spa_add_feature_stats(spa_t *spa, nvlist_t *config) 4269 { 4270 nvlist_t *features; 4271 zap_cursor_t zc; 4272 zap_attribute_t za; 4273 4274 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 4275 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4276 4277 if (spa->spa_feat_for_read_obj != 0) { 4278 for (zap_cursor_init(&zc, spa->spa_meta_objset, 4279 spa->spa_feat_for_read_obj); 4280 zap_cursor_retrieve(&zc, &za) == 0; 4281 zap_cursor_advance(&zc)) { 4282 ASSERT(za.za_integer_length == sizeof (uint64_t) && 4283 za.za_num_integers == 1); 4284 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 4285 za.za_first_integer)); 4286 } 4287 zap_cursor_fini(&zc); 4288 } 4289 4290 if (spa->spa_feat_for_write_obj != 0) { 4291 for (zap_cursor_init(&zc, spa->spa_meta_objset, 4292 spa->spa_feat_for_write_obj); 4293 zap_cursor_retrieve(&zc, &za) == 0; 4294 zap_cursor_advance(&zc)) { 4295 ASSERT(za.za_integer_length == sizeof (uint64_t) && 4296 za.za_num_integers == 1); 4297 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 4298 za.za_first_integer)); 4299 } 4300 zap_cursor_fini(&zc); 4301 } 4302 4303 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 4304 features) == 0); 4305 nvlist_free(features); 4306 } 4307 4308 int 4309 spa_get_stats(const char *name, nvlist_t **config, 4310 char *altroot, size_t buflen) 4311 { 4312 int error; 4313 spa_t *spa; 4314 4315 *config = NULL; 4316 error = spa_open_common(name, &spa, FTAG, NULL, config); 4317 4318 if (spa != NULL) { 4319 /* 4320 * This still leaves a window of inconsistency where the spares 4321 * or l2cache devices could change and the config would be 4322 * self-inconsistent. 4323 */ 4324 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4325 4326 if (*config != NULL) { 4327 uint64_t loadtimes[2]; 4328 4329 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 4330 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 4331 VERIFY(nvlist_add_uint64_array(*config, 4332 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 4333 4334 VERIFY(nvlist_add_uint64(*config, 4335 ZPOOL_CONFIG_ERRCOUNT, 4336 spa_get_errlog_size(spa)) == 0); 4337 4338 if (spa_suspended(spa)) 4339 VERIFY(nvlist_add_uint64(*config, 4340 ZPOOL_CONFIG_SUSPENDED, 4341 spa->spa_failmode) == 0); 4342 4343 spa_add_spares(spa, *config); 4344 spa_add_l2cache(spa, *config); 4345 spa_add_feature_stats(spa, *config); 4346 } 4347 } 4348 4349 /* 4350 * We want to get the alternate root even for faulted pools, so we cheat 4351 * and call spa_lookup() directly. 4352 */ 4353 if (altroot) { 4354 if (spa == NULL) { 4355 mutex_enter(&spa_namespace_lock); 4356 spa = spa_lookup(name); 4357 if (spa) 4358 spa_altroot(spa, altroot, buflen); 4359 else 4360 altroot[0] = '\0'; 4361 spa = NULL; 4362 mutex_exit(&spa_namespace_lock); 4363 } else { 4364 spa_altroot(spa, altroot, buflen); 4365 } 4366 } 4367 4368 if (spa != NULL) { 4369 spa_config_exit(spa, SCL_CONFIG, FTAG); 4370 spa_close(spa, FTAG); 4371 } 4372 4373 return (error); 4374 } 4375 4376 /* 4377 * Validate that the auxiliary device array is well formed. We must have an 4378 * array of nvlists, each which describes a valid leaf vdev. If this is an 4379 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 4380 * specified, as long as they are well-formed. 4381 */ 4382 static int 4383 spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 4384 spa_aux_vdev_t *sav, const char *config, uint64_t version, 4385 vdev_labeltype_t label) 4386 { 4387 nvlist_t **dev; 4388 uint_t i, ndev; 4389 vdev_t *vd; 4390 int error; 4391 4392 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 4393 4394 /* 4395 * It's acceptable to have no devs specified. 4396 */ 4397 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 4398 return (0); 4399 4400 if (ndev == 0) 4401 return (SET_ERROR(EINVAL)); 4402 4403 /* 4404 * Make sure the pool is formatted with a version that supports this 4405 * device type. 4406 */ 4407 if (spa_version(spa) < version) 4408 return (SET_ERROR(ENOTSUP)); 4409 4410 /* 4411 * Set the pending device list so we correctly handle device in-use 4412 * checking. 4413 */ 4414 sav->sav_pending = dev; 4415 sav->sav_npending = ndev; 4416 4417 for (i = 0; i < ndev; i++) { 4418 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 4419 mode)) != 0) 4420 goto out; 4421 4422 if (!vd->vdev_ops->vdev_op_leaf) { 4423 vdev_free(vd); 4424 error = SET_ERROR(EINVAL); 4425 goto out; 4426 } 4427 4428 /* 4429 * The L2ARC currently only supports disk devices in 4430 * kernel context. For user-level testing, we allow it. 4431 */ 4432 #ifdef _KERNEL 4433 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 4434 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 4435 error = SET_ERROR(ENOTBLK); 4436 vdev_free(vd); 4437 goto out; 4438 } 4439 #endif 4440 vd->vdev_top = vd; 4441 4442 if ((error = vdev_open(vd)) == 0 && 4443 (error = vdev_label_init(vd, crtxg, label)) == 0) { 4444 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 4445 vd->vdev_guid) == 0); 4446 } 4447 4448 vdev_free(vd); 4449 4450 if (error && 4451 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 4452 goto out; 4453 else 4454 error = 0; 4455 } 4456 4457 out: 4458 sav->sav_pending = NULL; 4459 sav->sav_npending = 0; 4460 return (error); 4461 } 4462 4463 static int 4464 spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 4465 { 4466 int error; 4467 4468 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 4469 4470 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 4471 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 4472 VDEV_LABEL_SPARE)) != 0) { 4473 return (error); 4474 } 4475 4476 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 4477 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 4478 VDEV_LABEL_L2CACHE)); 4479 } 4480 4481 static void 4482 spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 4483 const char *config) 4484 { 4485 int i; 4486 4487 if (sav->sav_config != NULL) { 4488 nvlist_t **olddevs; 4489 uint_t oldndevs; 4490 nvlist_t **newdevs; 4491 4492 /* 4493 * Generate new dev list by concatentating with the 4494 * current dev list. 4495 */ 4496 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 4497 &olddevs, &oldndevs) == 0); 4498 4499 newdevs = kmem_alloc(sizeof (void *) * 4500 (ndevs + oldndevs), KM_SLEEP); 4501 for (i = 0; i < oldndevs; i++) 4502 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 4503 KM_SLEEP) == 0); 4504 for (i = 0; i < ndevs; i++) 4505 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 4506 KM_SLEEP) == 0); 4507 4508 VERIFY(nvlist_remove(sav->sav_config, config, 4509 DATA_TYPE_NVLIST_ARRAY) == 0); 4510 4511 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 4512 config, newdevs, ndevs + oldndevs) == 0); 4513 for (i = 0; i < oldndevs + ndevs; i++) 4514 nvlist_free(newdevs[i]); 4515 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 4516 } else { 4517 /* 4518 * Generate a new dev list. 4519 */ 4520 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 4521 KM_SLEEP) == 0); 4522 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 4523 devs, ndevs) == 0); 4524 } 4525 } 4526 4527 /* 4528 * Stop and drop level 2 ARC devices 4529 */ 4530 void 4531 spa_l2cache_drop(spa_t *spa) 4532 { 4533 vdev_t *vd; 4534 int i; 4535 spa_aux_vdev_t *sav = &spa->spa_l2cache; 4536 4537 for (i = 0; i < sav->sav_count; i++) { 4538 uint64_t pool; 4539 4540 vd = sav->sav_vdevs[i]; 4541 ASSERT(vd != NULL); 4542 4543 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 4544 pool != 0ULL && l2arc_vdev_present(vd)) 4545 l2arc_remove_vdev(vd); 4546 } 4547 } 4548 4549 /* 4550 * Pool Creation 4551 */ 4552 int 4553 spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 4554 nvlist_t *zplprops) 4555 { 4556 spa_t *spa; 4557 char *altroot = NULL; 4558 vdev_t *rvd; 4559 dsl_pool_t *dp; 4560 dmu_tx_t *tx; 4561 int error = 0; 4562 uint64_t txg = TXG_INITIAL; 4563 nvlist_t **spares, **l2cache; 4564 uint_t nspares, nl2cache; 4565 uint64_t version, obj; 4566 boolean_t has_features; 4567 4568 /* 4569 * If this pool already exists, return failure. 4570 */ 4571 mutex_enter(&spa_namespace_lock); 4572 if (spa_lookup(pool) != NULL) { 4573 mutex_exit(&spa_namespace_lock); 4574 return (SET_ERROR(EEXIST)); 4575 } 4576 4577 /* 4578 * Allocate a new spa_t structure. 4579 */ 4580 (void) nvlist_lookup_string(props, 4581 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4582 spa = spa_add(pool, NULL, altroot); 4583 spa_activate(spa, spa_mode_global); 4584 4585 if (props && (error = spa_prop_validate(spa, props))) { 4586 spa_deactivate(spa); 4587 spa_remove(spa); 4588 mutex_exit(&spa_namespace_lock); 4589 return (error); 4590 } 4591 4592 has_features = B_FALSE; 4593 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 4594 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 4595 if (zpool_prop_feature(nvpair_name(elem))) 4596 has_features = B_TRUE; 4597 } 4598 4599 if (has_features || nvlist_lookup_uint64(props, 4600 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 4601 version = SPA_VERSION; 4602 } 4603 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 4604 4605 spa->spa_first_txg = txg; 4606 spa->spa_uberblock.ub_txg = txg - 1; 4607 spa->spa_uberblock.ub_version = version; 4608 spa->spa_ubsync = spa->spa_uberblock; 4609 spa->spa_load_state = SPA_LOAD_CREATE; 4610 spa->spa_removing_phys.sr_state = DSS_NONE; 4611 spa->spa_removing_phys.sr_removing_vdev = -1; 4612 spa->spa_removing_phys.sr_prev_indirect_vdev = -1; 4613 4614 /* 4615 * Create "The Godfather" zio to hold all async IOs 4616 */ 4617 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 4618 KM_SLEEP); 4619 for (int i = 0; i < max_ncpus; i++) { 4620 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 4621 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 4622 ZIO_FLAG_GODFATHER); 4623 } 4624 4625 /* 4626 * Create the root vdev. 4627 */ 4628 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4629 4630 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 4631 4632 ASSERT(error != 0 || rvd != NULL); 4633 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 4634 4635 if (error == 0 && !zfs_allocatable_devs(nvroot)) 4636 error = SET_ERROR(EINVAL); 4637 4638 if (error == 0 && 4639 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 4640 (error = spa_validate_aux(spa, nvroot, txg, 4641 VDEV_ALLOC_ADD)) == 0) { 4642 for (int c = 0; c < rvd->vdev_children; c++) { 4643 vdev_metaslab_set_size(rvd->vdev_child[c]); 4644 vdev_expand(rvd->vdev_child[c], txg); 4645 } 4646 } 4647 4648 spa_config_exit(spa, SCL_ALL, FTAG); 4649 4650 if (error != 0) { 4651 spa_unload(spa); 4652 spa_deactivate(spa); 4653 spa_remove(spa); 4654 mutex_exit(&spa_namespace_lock); 4655 return (error); 4656 } 4657 4658 /* 4659 * Get the list of spares, if specified. 4660 */ 4661 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4662 &spares, &nspares) == 0) { 4663 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 4664 KM_SLEEP) == 0); 4665 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4666 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4667 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4668 spa_load_spares(spa); 4669 spa_config_exit(spa, SCL_ALL, FTAG); 4670 spa->spa_spares.sav_sync = B_TRUE; 4671 } 4672 4673 /* 4674 * Get the list of level 2 cache devices, if specified. 4675 */ 4676 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4677 &l2cache, &nl2cache) == 0) { 4678 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4679 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4680 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4681 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4682 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4683 spa_load_l2cache(spa); 4684 spa_config_exit(spa, SCL_ALL, FTAG); 4685 spa->spa_l2cache.sav_sync = B_TRUE; 4686 } 4687 4688 spa->spa_is_initializing = B_TRUE; 4689 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 4690 spa->spa_meta_objset = dp->dp_meta_objset; 4691 spa->spa_is_initializing = B_FALSE; 4692 4693 /* 4694 * Create DDTs (dedup tables). 4695 */ 4696 ddt_create(spa); 4697 4698 spa_update_dspace(spa); 4699 4700 tx = dmu_tx_create_assigned(dp, txg); 4701 4702 /* 4703 * Create the pool config object. 4704 */ 4705 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 4706 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 4707 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 4708 4709 if (zap_add(spa->spa_meta_objset, 4710 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 4711 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 4712 cmn_err(CE_PANIC, "failed to add pool config"); 4713 } 4714 4715 if (spa_version(spa) >= SPA_VERSION_FEATURES) 4716 spa_feature_create_zap_objects(spa, tx); 4717 4718 if (zap_add(spa->spa_meta_objset, 4719 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 4720 sizeof (uint64_t), 1, &version, tx) != 0) { 4721 cmn_err(CE_PANIC, "failed to add pool version"); 4722 } 4723 4724 /* Newly created pools with the right version are always deflated. */ 4725 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 4726 spa->spa_deflate = TRUE; 4727 if (zap_add(spa->spa_meta_objset, 4728 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 4729 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 4730 cmn_err(CE_PANIC, "failed to add deflate"); 4731 } 4732 } 4733 4734 /* 4735 * Create the deferred-free bpobj. Turn off compression 4736 * because sync-to-convergence takes longer if the blocksize 4737 * keeps changing. 4738 */ 4739 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 4740 dmu_object_set_compress(spa->spa_meta_objset, obj, 4741 ZIO_COMPRESS_OFF, tx); 4742 if (zap_add(spa->spa_meta_objset, 4743 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 4744 sizeof (uint64_t), 1, &obj, tx) != 0) { 4745 cmn_err(CE_PANIC, "failed to add bpobj"); 4746 } 4747 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 4748 spa->spa_meta_objset, obj)); 4749 4750 /* 4751 * Create the pool's history object. 4752 */ 4753 if (version >= SPA_VERSION_ZPOOL_HISTORY) 4754 spa_history_create_obj(spa, tx); 4755 4756 /* 4757 * Generate some random noise for salted checksums to operate on. 4758 */ 4759 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 4760 sizeof (spa->spa_cksum_salt.zcs_bytes)); 4761 4762 /* 4763 * Set pool properties. 4764 */ 4765 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 4766 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 4767 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 4768 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 4769 4770 if (props != NULL) { 4771 spa_configfile_set(spa, props, B_FALSE); 4772 spa_sync_props(props, tx); 4773 } 4774 4775 dmu_tx_commit(tx); 4776 4777 spa->spa_sync_on = B_TRUE; 4778 txg_sync_start(spa->spa_dsl_pool); 4779 4780 /* 4781 * We explicitly wait for the first transaction to complete so that our 4782 * bean counters are appropriately updated. 4783 */ 4784 txg_wait_synced(spa->spa_dsl_pool, txg); 4785 4786 spa_spawn_aux_threads(spa); 4787 4788 spa_write_cachefile(spa, B_FALSE, B_TRUE); 4789 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_CREATE); 4790 4791 spa_history_log_version(spa, "create"); 4792 4793 /* 4794 * Don't count references from objsets that are already closed 4795 * and are making their way through the eviction process. 4796 */ 4797 spa_evicting_os_wait(spa); 4798 spa->spa_minref = refcount_count(&spa->spa_refcount); 4799 spa->spa_load_state = SPA_LOAD_NONE; 4800 4801 mutex_exit(&spa_namespace_lock); 4802 4803 return (0); 4804 } 4805 4806 #ifdef _KERNEL 4807 /* 4808 * Get the root pool information from the root disk, then import the root pool 4809 * during the system boot up time. 4810 */ 4811 extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 4812 4813 static nvlist_t * 4814 spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 4815 { 4816 nvlist_t *config; 4817 nvlist_t *nvtop, *nvroot; 4818 uint64_t pgid; 4819 4820 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 4821 return (NULL); 4822 4823 /* 4824 * Add this top-level vdev to the child array. 4825 */ 4826 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4827 &nvtop) == 0); 4828 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 4829 &pgid) == 0); 4830 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 4831 4832 /* 4833 * Put this pool's top-level vdevs into a root vdev. 4834 */ 4835 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4836 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 4837 VDEV_TYPE_ROOT) == 0); 4838 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 4839 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 4840 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 4841 &nvtop, 1) == 0); 4842 4843 /* 4844 * Replace the existing vdev_tree with the new root vdev in 4845 * this pool's configuration (remove the old, add the new). 4846 */ 4847 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 4848 nvlist_free(nvroot); 4849 return (config); 4850 } 4851 4852 /* 4853 * Walk the vdev tree and see if we can find a device with "better" 4854 * configuration. A configuration is "better" if the label on that 4855 * device has a more recent txg. 4856 */ 4857 static void 4858 spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 4859 { 4860 for (int c = 0; c < vd->vdev_children; c++) 4861 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 4862 4863 if (vd->vdev_ops->vdev_op_leaf) { 4864 nvlist_t *label; 4865 uint64_t label_txg; 4866 4867 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 4868 &label) != 0) 4869 return; 4870 4871 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 4872 &label_txg) == 0); 4873 4874 /* 4875 * Do we have a better boot device? 4876 */ 4877 if (label_txg > *txg) { 4878 *txg = label_txg; 4879 *avd = vd; 4880 } 4881 nvlist_free(label); 4882 } 4883 } 4884 4885 /* 4886 * Import a root pool. 4887 * 4888 * For x86. devpath_list will consist of devid and/or physpath name of 4889 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 4890 * The GRUB "findroot" command will return the vdev we should boot. 4891 * 4892 * For Sparc, devpath_list consists the physpath name of the booting device 4893 * no matter the rootpool is a single device pool or a mirrored pool. 4894 * e.g. 4895 * "/pci@1f,0/ide@d/disk@0,0:a" 4896 */ 4897 int 4898 spa_import_rootpool(char *devpath, char *devid) 4899 { 4900 spa_t *spa; 4901 vdev_t *rvd, *bvd, *avd = NULL; 4902 nvlist_t *config, *nvtop; 4903 uint64_t guid, txg; 4904 char *pname; 4905 int error; 4906 4907 /* 4908 * Read the label from the boot device and generate a configuration. 4909 */ 4910 config = spa_generate_rootconf(devpath, devid, &guid); 4911 #if defined(_OBP) && defined(_KERNEL) 4912 if (config == NULL) { 4913 if (strstr(devpath, "/iscsi/ssd") != NULL) { 4914 /* iscsi boot */ 4915 get_iscsi_bootpath_phy(devpath); 4916 config = spa_generate_rootconf(devpath, devid, &guid); 4917 } 4918 } 4919 #endif 4920 if (config == NULL) { 4921 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 4922 devpath); 4923 return (SET_ERROR(EIO)); 4924 } 4925 4926 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 4927 &pname) == 0); 4928 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 4929 4930 mutex_enter(&spa_namespace_lock); 4931 if ((spa = spa_lookup(pname)) != NULL) { 4932 /* 4933 * Remove the existing root pool from the namespace so that we 4934 * can replace it with the correct config we just read in. 4935 */ 4936 spa_remove(spa); 4937 } 4938 4939 spa = spa_add(pname, config, NULL); 4940 spa->spa_is_root = B_TRUE; 4941 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 4942 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 4943 &spa->spa_ubsync.ub_version) != 0) 4944 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 4945 4946 /* 4947 * Build up a vdev tree based on the boot device's label config. 4948 */ 4949 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4950 &nvtop) == 0); 4951 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4952 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 4953 VDEV_ALLOC_ROOTPOOL); 4954 spa_config_exit(spa, SCL_ALL, FTAG); 4955 if (error) { 4956 mutex_exit(&spa_namespace_lock); 4957 nvlist_free(config); 4958 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 4959 pname); 4960 return (error); 4961 } 4962 4963 /* 4964 * Get the boot vdev. 4965 */ 4966 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 4967 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 4968 (u_longlong_t)guid); 4969 error = SET_ERROR(ENOENT); 4970 goto out; 4971 } 4972 4973 /* 4974 * Determine if there is a better boot device. 4975 */ 4976 avd = bvd; 4977 spa_alt_rootvdev(rvd, &avd, &txg); 4978 if (avd != bvd) { 4979 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 4980 "try booting from '%s'", avd->vdev_path); 4981 error = SET_ERROR(EINVAL); 4982 goto out; 4983 } 4984 4985 /* 4986 * If the boot device is part of a spare vdev then ensure that 4987 * we're booting off the active spare. 4988 */ 4989 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 4990 !bvd->vdev_isspare) { 4991 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 4992 "try booting from '%s'", 4993 bvd->vdev_parent-> 4994 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 4995 error = SET_ERROR(EINVAL); 4996 goto out; 4997 } 4998 4999 error = 0; 5000 out: 5001 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5002 vdev_free(rvd); 5003 spa_config_exit(spa, SCL_ALL, FTAG); 5004 mutex_exit(&spa_namespace_lock); 5005 5006 nvlist_free(config); 5007 return (error); 5008 } 5009 5010 #endif 5011 5012 /* 5013 * Import a non-root pool into the system. 5014 */ 5015 int 5016 spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 5017 { 5018 spa_t *spa; 5019 char *altroot = NULL; 5020 spa_load_state_t state = SPA_LOAD_IMPORT; 5021 zpool_load_policy_t policy; 5022 uint64_t mode = spa_mode_global; 5023 uint64_t readonly = B_FALSE; 5024 int error; 5025 nvlist_t *nvroot; 5026 nvlist_t **spares, **l2cache; 5027 uint_t nspares, nl2cache; 5028 5029 /* 5030 * If a pool with this name exists, return failure. 5031 */ 5032 mutex_enter(&spa_namespace_lock); 5033 if (spa_lookup(pool) != NULL) { 5034 mutex_exit(&spa_namespace_lock); 5035 return (SET_ERROR(EEXIST)); 5036 } 5037 5038 /* 5039 * Create and initialize the spa structure. 5040 */ 5041 (void) nvlist_lookup_string(props, 5042 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5043 (void) nvlist_lookup_uint64(props, 5044 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 5045 if (readonly) 5046 mode = FREAD; 5047 spa = spa_add(pool, config, altroot); 5048 spa->spa_import_flags = flags; 5049 5050 /* 5051 * Verbatim import - Take a pool and insert it into the namespace 5052 * as if it had been loaded at boot. 5053 */ 5054 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 5055 if (props != NULL) 5056 spa_configfile_set(spa, props, B_FALSE); 5057 5058 spa_write_cachefile(spa, B_FALSE, B_TRUE); 5059 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT); 5060 zfs_dbgmsg("spa_import: verbatim import of %s", pool); 5061 mutex_exit(&spa_namespace_lock); 5062 return (0); 5063 } 5064 5065 spa_activate(spa, mode); 5066 5067 /* 5068 * Don't start async tasks until we know everything is healthy. 5069 */ 5070 spa_async_suspend(spa); 5071 5072 zpool_get_load_policy(config, &policy); 5073 if (policy.zlp_rewind & ZPOOL_DO_REWIND) 5074 state = SPA_LOAD_RECOVER; 5075 5076 spa->spa_config_source = SPA_CONFIG_SRC_TRYIMPORT; 5077 5078 if (state != SPA_LOAD_RECOVER) { 5079 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 5080 zfs_dbgmsg("spa_import: importing %s", pool); 5081 } else { 5082 zfs_dbgmsg("spa_import: importing %s, max_txg=%lld " 5083 "(RECOVERY MODE)", pool, (longlong_t)policy.zlp_txg); 5084 } 5085 error = spa_load_best(spa, state, policy.zlp_txg, policy.zlp_rewind); 5086 5087 /* 5088 * Propagate anything learned while loading the pool and pass it 5089 * back to caller (i.e. rewind info, missing devices, etc). 5090 */ 5091 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 5092 spa->spa_load_info) == 0); 5093 5094 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5095 /* 5096 * Toss any existing sparelist, as it doesn't have any validity 5097 * anymore, and conflicts with spa_has_spare(). 5098 */ 5099 if (spa->spa_spares.sav_config) { 5100 nvlist_free(spa->spa_spares.sav_config); 5101 spa->spa_spares.sav_config = NULL; 5102 spa_load_spares(spa); 5103 } 5104 if (spa->spa_l2cache.sav_config) { 5105 nvlist_free(spa->spa_l2cache.sav_config); 5106 spa->spa_l2cache.sav_config = NULL; 5107 spa_load_l2cache(spa); 5108 } 5109 5110 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 5111 &nvroot) == 0); 5112 if (error == 0) 5113 error = spa_validate_aux(spa, nvroot, -1ULL, 5114 VDEV_ALLOC_SPARE); 5115 if (error == 0) 5116 error = spa_validate_aux(spa, nvroot, -1ULL, 5117 VDEV_ALLOC_L2CACHE); 5118 spa_config_exit(spa, SCL_ALL, FTAG); 5119 5120 if (props != NULL) 5121 spa_configfile_set(spa, props, B_FALSE); 5122 5123 if (error != 0 || (props && spa_writeable(spa) && 5124 (error = spa_prop_set(spa, props)))) { 5125 spa_unload(spa); 5126 spa_deactivate(spa); 5127 spa_remove(spa); 5128 mutex_exit(&spa_namespace_lock); 5129 return (error); 5130 } 5131 5132 spa_async_resume(spa); 5133 5134 /* 5135 * Override any spares and level 2 cache devices as specified by 5136 * the user, as these may have correct device names/devids, etc. 5137 */ 5138 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 5139 &spares, &nspares) == 0) { 5140 if (spa->spa_spares.sav_config) 5141 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 5142 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 5143 else 5144 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 5145 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5146 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 5147 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 5148 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5149 spa_load_spares(spa); 5150 spa_config_exit(spa, SCL_ALL, FTAG); 5151 spa->spa_spares.sav_sync = B_TRUE; 5152 } 5153 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 5154 &l2cache, &nl2cache) == 0) { 5155 if (spa->spa_l2cache.sav_config) 5156 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 5157 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 5158 else 5159 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 5160 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5161 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 5162 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 5163 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5164 spa_load_l2cache(spa); 5165 spa_config_exit(spa, SCL_ALL, FTAG); 5166 spa->spa_l2cache.sav_sync = B_TRUE; 5167 } 5168 5169 /* 5170 * Check for any removed devices. 5171 */ 5172 if (spa->spa_autoreplace) { 5173 spa_aux_check_removed(&spa->spa_spares); 5174 spa_aux_check_removed(&spa->spa_l2cache); 5175 } 5176 5177 if (spa_writeable(spa)) { 5178 /* 5179 * Update the config cache to include the newly-imported pool. 5180 */ 5181 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 5182 } 5183 5184 /* 5185 * It's possible that the pool was expanded while it was exported. 5186 * We kick off an async task to handle this for us. 5187 */ 5188 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 5189 5190 spa_history_log_version(spa, "import"); 5191 5192 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT); 5193 5194 mutex_exit(&spa_namespace_lock); 5195 5196 return (0); 5197 } 5198 5199 nvlist_t * 5200 spa_tryimport(nvlist_t *tryconfig) 5201 { 5202 nvlist_t *config = NULL; 5203 char *poolname, *cachefile; 5204 spa_t *spa; 5205 uint64_t state; 5206 int error; 5207 zpool_load_policy_t policy; 5208 5209 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 5210 return (NULL); 5211 5212 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 5213 return (NULL); 5214 5215 /* 5216 * Create and initialize the spa structure. 5217 */ 5218 mutex_enter(&spa_namespace_lock); 5219 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 5220 spa_activate(spa, FREAD); 5221 5222 /* 5223 * Rewind pool if a max txg was provided. 5224 */ 5225 zpool_get_load_policy(spa->spa_config, &policy); 5226 if (policy.zlp_txg != UINT64_MAX) { 5227 spa->spa_load_max_txg = policy.zlp_txg; 5228 spa->spa_extreme_rewind = B_TRUE; 5229 zfs_dbgmsg("spa_tryimport: importing %s, max_txg=%lld", 5230 poolname, (longlong_t)policy.zlp_txg); 5231 } else { 5232 zfs_dbgmsg("spa_tryimport: importing %s", poolname); 5233 } 5234 5235 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_CACHEFILE, &cachefile) 5236 == 0) { 5237 zfs_dbgmsg("spa_tryimport: using cachefile '%s'", cachefile); 5238 spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE; 5239 } else { 5240 spa->spa_config_source = SPA_CONFIG_SRC_SCAN; 5241 } 5242 5243 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING); 5244 5245 /* 5246 * If 'tryconfig' was at least parsable, return the current config. 5247 */ 5248 if (spa->spa_root_vdev != NULL) { 5249 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 5250 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 5251 poolname) == 0); 5252 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5253 state) == 0); 5254 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 5255 spa->spa_uberblock.ub_timestamp) == 0); 5256 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 5257 spa->spa_load_info) == 0); 5258 5259 /* 5260 * If the bootfs property exists on this pool then we 5261 * copy it out so that external consumers can tell which 5262 * pools are bootable. 5263 */ 5264 if ((!error || error == EEXIST) && spa->spa_bootfs) { 5265 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 5266 5267 /* 5268 * We have to play games with the name since the 5269 * pool was opened as TRYIMPORT_NAME. 5270 */ 5271 if (dsl_dsobj_to_dsname(spa_name(spa), 5272 spa->spa_bootfs, tmpname) == 0) { 5273 char *cp; 5274 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 5275 5276 cp = strchr(tmpname, '/'); 5277 if (cp == NULL) { 5278 (void) strlcpy(dsname, tmpname, 5279 MAXPATHLEN); 5280 } else { 5281 (void) snprintf(dsname, MAXPATHLEN, 5282 "%s/%s", poolname, ++cp); 5283 } 5284 VERIFY(nvlist_add_string(config, 5285 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 5286 kmem_free(dsname, MAXPATHLEN); 5287 } 5288 kmem_free(tmpname, MAXPATHLEN); 5289 } 5290 5291 /* 5292 * Add the list of hot spares and level 2 cache devices. 5293 */ 5294 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 5295 spa_add_spares(spa, config); 5296 spa_add_l2cache(spa, config); 5297 spa_config_exit(spa, SCL_CONFIG, FTAG); 5298 } 5299 5300 spa_unload(spa); 5301 spa_deactivate(spa); 5302 spa_remove(spa); 5303 mutex_exit(&spa_namespace_lock); 5304 5305 return (config); 5306 } 5307 5308 /* 5309 * Pool export/destroy 5310 * 5311 * The act of destroying or exporting a pool is very simple. We make sure there 5312 * is no more pending I/O and any references to the pool are gone. Then, we 5313 * update the pool state and sync all the labels to disk, removing the 5314 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 5315 * we don't sync the labels or remove the configuration cache. 5316 */ 5317 static int 5318 spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 5319 boolean_t force, boolean_t hardforce) 5320 { 5321 spa_t *spa; 5322 5323 if (oldconfig) 5324 *oldconfig = NULL; 5325 5326 if (!(spa_mode_global & FWRITE)) 5327 return (SET_ERROR(EROFS)); 5328 5329 mutex_enter(&spa_namespace_lock); 5330 if ((spa = spa_lookup(pool)) == NULL) { 5331 mutex_exit(&spa_namespace_lock); 5332 return (SET_ERROR(ENOENT)); 5333 } 5334 5335 /* 5336 * Put a hold on the pool, drop the namespace lock, stop async tasks, 5337 * reacquire the namespace lock, and see if we can export. 5338 */ 5339 spa_open_ref(spa, FTAG); 5340 mutex_exit(&spa_namespace_lock); 5341 spa_async_suspend(spa); 5342 mutex_enter(&spa_namespace_lock); 5343 spa_close(spa, FTAG); 5344 5345 /* 5346 * The pool will be in core if it's openable, 5347 * in which case we can modify its state. 5348 */ 5349 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 5350 /* 5351 * Objsets may be open only because they're dirty, so we 5352 * have to force it to sync before checking spa_refcnt. 5353 */ 5354 txg_wait_synced(spa->spa_dsl_pool, 0); 5355 spa_evicting_os_wait(spa); 5356 5357 /* 5358 * A pool cannot be exported or destroyed if there are active 5359 * references. If we are resetting a pool, allow references by 5360 * fault injection handlers. 5361 */ 5362 if (!spa_refcount_zero(spa) || 5363 (spa->spa_inject_ref != 0 && 5364 new_state != POOL_STATE_UNINITIALIZED)) { 5365 spa_async_resume(spa); 5366 mutex_exit(&spa_namespace_lock); 5367 return (SET_ERROR(EBUSY)); 5368 } 5369 5370 /* 5371 * A pool cannot be exported if it has an active shared spare. 5372 * This is to prevent other pools stealing the active spare 5373 * from an exported pool. At user's own will, such pool can 5374 * be forcedly exported. 5375 */ 5376 if (!force && new_state == POOL_STATE_EXPORTED && 5377 spa_has_active_shared_spare(spa)) { 5378 spa_async_resume(spa); 5379 mutex_exit(&spa_namespace_lock); 5380 return (SET_ERROR(EXDEV)); 5381 } 5382 5383 /* 5384 * We want this to be reflected on every label, 5385 * so mark them all dirty. spa_unload() will do the 5386 * final sync that pushes these changes out. 5387 */ 5388 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 5389 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5390 spa->spa_state = new_state; 5391 spa->spa_final_txg = spa_last_synced_txg(spa) + 5392 TXG_DEFER_SIZE + 1; 5393 vdev_config_dirty(spa->spa_root_vdev); 5394 spa_config_exit(spa, SCL_ALL, FTAG); 5395 } 5396 } 5397 5398 spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_DESTROY); 5399 5400 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 5401 spa_unload(spa); 5402 spa_deactivate(spa); 5403 } 5404 5405 if (oldconfig && spa->spa_config) 5406 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 5407 5408 if (new_state != POOL_STATE_UNINITIALIZED) { 5409 if (!hardforce) 5410 spa_write_cachefile(spa, B_TRUE, B_TRUE); 5411 spa_remove(spa); 5412 } 5413 mutex_exit(&spa_namespace_lock); 5414 5415 return (0); 5416 } 5417 5418 /* 5419 * Destroy a storage pool. 5420 */ 5421 int 5422 spa_destroy(char *pool) 5423 { 5424 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 5425 B_FALSE, B_FALSE)); 5426 } 5427 5428 /* 5429 * Export a storage pool. 5430 */ 5431 int 5432 spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 5433 boolean_t hardforce) 5434 { 5435 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 5436 force, hardforce)); 5437 } 5438 5439 /* 5440 * Similar to spa_export(), this unloads the spa_t without actually removing it 5441 * from the namespace in any way. 5442 */ 5443 int 5444 spa_reset(char *pool) 5445 { 5446 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 5447 B_FALSE, B_FALSE)); 5448 } 5449 5450 /* 5451 * ========================================================================== 5452 * Device manipulation 5453 * ========================================================================== 5454 */ 5455 5456 /* 5457 * Add a device to a storage pool. 5458 */ 5459 int 5460 spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 5461 { 5462 uint64_t txg, id; 5463 int error; 5464 vdev_t *rvd = spa->spa_root_vdev; 5465 vdev_t *vd, *tvd; 5466 nvlist_t **spares, **l2cache; 5467 uint_t nspares, nl2cache; 5468 5469 ASSERT(spa_writeable(spa)); 5470 5471 txg = spa_vdev_enter(spa); 5472 5473 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 5474 VDEV_ALLOC_ADD)) != 0) 5475 return (spa_vdev_exit(spa, NULL, txg, error)); 5476 5477 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 5478 5479 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 5480 &nspares) != 0) 5481 nspares = 0; 5482 5483 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 5484 &nl2cache) != 0) 5485 nl2cache = 0; 5486 5487 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 5488 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 5489 5490 if (vd->vdev_children != 0 && 5491 (error = vdev_create(vd, txg, B_FALSE)) != 0) 5492 return (spa_vdev_exit(spa, vd, txg, error)); 5493 5494 /* 5495 * We must validate the spares and l2cache devices after checking the 5496 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 5497 */ 5498 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 5499 return (spa_vdev_exit(spa, vd, txg, error)); 5500 5501 /* 5502 * If we are in the middle of a device removal, we can only add 5503 * devices which match the existing devices in the pool. 5504 * If we are in the middle of a removal, or have some indirect 5505 * vdevs, we can not add raidz toplevels. 5506 */ 5507 if (spa->spa_vdev_removal != NULL || 5508 spa->spa_removing_phys.sr_prev_indirect_vdev != -1) { 5509 for (int c = 0; c < vd->vdev_children; c++) { 5510 tvd = vd->vdev_child[c]; 5511 if (spa->spa_vdev_removal != NULL && 5512 tvd->vdev_ashift != spa->spa_max_ashift) { 5513 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 5514 } 5515 /* Fail if top level vdev is raidz */ 5516 if (tvd->vdev_ops == &vdev_raidz_ops) { 5517 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 5518 } 5519 /* 5520 * Need the top level mirror to be 5521 * a mirror of leaf vdevs only 5522 */ 5523 if (tvd->vdev_ops == &vdev_mirror_ops) { 5524 for (uint64_t cid = 0; 5525 cid < tvd->vdev_children; cid++) { 5526 vdev_t *cvd = tvd->vdev_child[cid]; 5527 if (!cvd->vdev_ops->vdev_op_leaf) { 5528 return (spa_vdev_exit(spa, vd, 5529 txg, EINVAL)); 5530 } 5531 } 5532 } 5533 } 5534 } 5535 5536 for (int c = 0; c < vd->vdev_children; c++) { 5537 5538 /* 5539 * Set the vdev id to the first hole, if one exists. 5540 */ 5541 for (id = 0; id < rvd->vdev_children; id++) { 5542 if (rvd->vdev_child[id]->vdev_ishole) { 5543 vdev_free(rvd->vdev_child[id]); 5544 break; 5545 } 5546 } 5547 tvd = vd->vdev_child[c]; 5548 vdev_remove_child(vd, tvd); 5549 tvd->vdev_id = id; 5550 vdev_add_child(rvd, tvd); 5551 vdev_config_dirty(tvd); 5552 } 5553 5554 if (nspares != 0) { 5555 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 5556 ZPOOL_CONFIG_SPARES); 5557 spa_load_spares(spa); 5558 spa->spa_spares.sav_sync = B_TRUE; 5559 } 5560 5561 if (nl2cache != 0) { 5562 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 5563 ZPOOL_CONFIG_L2CACHE); 5564 spa_load_l2cache(spa); 5565 spa->spa_l2cache.sav_sync = B_TRUE; 5566 } 5567 5568 /* 5569 * We have to be careful when adding new vdevs to an existing pool. 5570 * If other threads start allocating from these vdevs before we 5571 * sync the config cache, and we lose power, then upon reboot we may 5572 * fail to open the pool because there are DVAs that the config cache 5573 * can't translate. Therefore, we first add the vdevs without 5574 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 5575 * and then let spa_config_update() initialize the new metaslabs. 5576 * 5577 * spa_load() checks for added-but-not-initialized vdevs, so that 5578 * if we lose power at any point in this sequence, the remaining 5579 * steps will be completed the next time we load the pool. 5580 */ 5581 (void) spa_vdev_exit(spa, vd, txg, 0); 5582 5583 mutex_enter(&spa_namespace_lock); 5584 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 5585 spa_event_notify(spa, NULL, NULL, ESC_ZFS_VDEV_ADD); 5586 mutex_exit(&spa_namespace_lock); 5587 5588 return (0); 5589 } 5590 5591 /* 5592 * Attach a device to a mirror. The arguments are the path to any device 5593 * in the mirror, and the nvroot for the new device. If the path specifies 5594 * a device that is not mirrored, we automatically insert the mirror vdev. 5595 * 5596 * If 'replacing' is specified, the new device is intended to replace the 5597 * existing device; in this case the two devices are made into their own 5598 * mirror using the 'replacing' vdev, which is functionally identical to 5599 * the mirror vdev (it actually reuses all the same ops) but has a few 5600 * extra rules: you can't attach to it after it's been created, and upon 5601 * completion of resilvering, the first disk (the one being replaced) 5602 * is automatically detached. 5603 */ 5604 int 5605 spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 5606 { 5607 uint64_t txg, dtl_max_txg; 5608 vdev_t *rvd = spa->spa_root_vdev; 5609 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 5610 vdev_ops_t *pvops; 5611 char *oldvdpath, *newvdpath; 5612 int newvd_isspare; 5613 int error; 5614 5615 ASSERT(spa_writeable(spa)); 5616 5617 txg = spa_vdev_enter(spa); 5618 5619 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 5620 5621 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5622 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 5623 error = (spa_has_checkpoint(spa)) ? 5624 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 5625 return (spa_vdev_exit(spa, NULL, txg, error)); 5626 } 5627 5628 if (spa->spa_vdev_removal != NULL) 5629 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5630 5631 if (oldvd == NULL) 5632 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 5633 5634 if (!oldvd->vdev_ops->vdev_op_leaf) 5635 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5636 5637 pvd = oldvd->vdev_parent; 5638 5639 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 5640 VDEV_ALLOC_ATTACH)) != 0) 5641 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5642 5643 if (newrootvd->vdev_children != 1) 5644 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 5645 5646 newvd = newrootvd->vdev_child[0]; 5647 5648 if (!newvd->vdev_ops->vdev_op_leaf) 5649 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 5650 5651 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 5652 return (spa_vdev_exit(spa, newrootvd, txg, error)); 5653 5654 /* 5655 * Spares can't replace logs 5656 */ 5657 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 5658 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 5659 5660 if (!replacing) { 5661 /* 5662 * For attach, the only allowable parent is a mirror or the root 5663 * vdev. 5664 */ 5665 if (pvd->vdev_ops != &vdev_mirror_ops && 5666 pvd->vdev_ops != &vdev_root_ops) 5667 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 5668 5669 pvops = &vdev_mirror_ops; 5670 } else { 5671 /* 5672 * Active hot spares can only be replaced by inactive hot 5673 * spares. 5674 */ 5675 if (pvd->vdev_ops == &vdev_spare_ops && 5676 oldvd->vdev_isspare && 5677 !spa_has_spare(spa, newvd->vdev_guid)) 5678 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 5679 5680 /* 5681 * If the source is a hot spare, and the parent isn't already a 5682 * spare, then we want to create a new hot spare. Otherwise, we 5683 * want to create a replacing vdev. The user is not allowed to 5684 * attach to a spared vdev child unless the 'isspare' state is 5685 * the same (spare replaces spare, non-spare replaces 5686 * non-spare). 5687 */ 5688 if (pvd->vdev_ops == &vdev_replacing_ops && 5689 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 5690 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 5691 } else if (pvd->vdev_ops == &vdev_spare_ops && 5692 newvd->vdev_isspare != oldvd->vdev_isspare) { 5693 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 5694 } 5695 5696 if (newvd->vdev_isspare) 5697 pvops = &vdev_spare_ops; 5698 else 5699 pvops = &vdev_replacing_ops; 5700 } 5701 5702 /* 5703 * Make sure the new device is big enough. 5704 */ 5705 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 5706 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 5707 5708 /* 5709 * The new device cannot have a higher alignment requirement 5710 * than the top-level vdev. 5711 */ 5712 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 5713 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 5714 5715 /* 5716 * If this is an in-place replacement, update oldvd's path and devid 5717 * to make it distinguishable from newvd, and unopenable from now on. 5718 */ 5719 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 5720 spa_strfree(oldvd->vdev_path); 5721 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 5722 KM_SLEEP); 5723 (void) sprintf(oldvd->vdev_path, "%s/%s", 5724 newvd->vdev_path, "old"); 5725 if (oldvd->vdev_devid != NULL) { 5726 spa_strfree(oldvd->vdev_devid); 5727 oldvd->vdev_devid = NULL; 5728 } 5729 } 5730 5731 /* mark the device being resilvered */ 5732 newvd->vdev_resilver_txg = txg; 5733 5734 /* 5735 * If the parent is not a mirror, or if we're replacing, insert the new 5736 * mirror/replacing/spare vdev above oldvd. 5737 */ 5738 if (pvd->vdev_ops != pvops) 5739 pvd = vdev_add_parent(oldvd, pvops); 5740 5741 ASSERT(pvd->vdev_top->vdev_parent == rvd); 5742 ASSERT(pvd->vdev_ops == pvops); 5743 ASSERT(oldvd->vdev_parent == pvd); 5744 5745 /* 5746 * Extract the new device from its root and add it to pvd. 5747 */ 5748 vdev_remove_child(newrootvd, newvd); 5749 newvd->vdev_id = pvd->vdev_children; 5750 newvd->vdev_crtxg = oldvd->vdev_crtxg; 5751 vdev_add_child(pvd, newvd); 5752 5753 tvd = newvd->vdev_top; 5754 ASSERT(pvd->vdev_top == tvd); 5755 ASSERT(tvd->vdev_parent == rvd); 5756 5757 vdev_config_dirty(tvd); 5758 5759 /* 5760 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 5761 * for any dmu_sync-ed blocks. It will propagate upward when 5762 * spa_vdev_exit() calls vdev_dtl_reassess(). 5763 */ 5764 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 5765 5766 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 5767 dtl_max_txg - TXG_INITIAL); 5768 5769 if (newvd->vdev_isspare) { 5770 spa_spare_activate(newvd); 5771 spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_SPARE); 5772 } 5773 5774 oldvdpath = spa_strdup(oldvd->vdev_path); 5775 newvdpath = spa_strdup(newvd->vdev_path); 5776 newvd_isspare = newvd->vdev_isspare; 5777 5778 /* 5779 * Mark newvd's DTL dirty in this txg. 5780 */ 5781 vdev_dirty(tvd, VDD_DTL, newvd, txg); 5782 5783 /* 5784 * Schedule the resilver to restart in the future. We do this to 5785 * ensure that dmu_sync-ed blocks have been stitched into the 5786 * respective datasets. 5787 */ 5788 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 5789 5790 if (spa->spa_bootfs) 5791 spa_event_notify(spa, newvd, NULL, ESC_ZFS_BOOTFS_VDEV_ATTACH); 5792 5793 spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_ATTACH); 5794 5795 /* 5796 * Commit the config 5797 */ 5798 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 5799 5800 spa_history_log_internal(spa, "vdev attach", NULL, 5801 "%s vdev=%s %s vdev=%s", 5802 replacing && newvd_isspare ? "spare in" : 5803 replacing ? "replace" : "attach", newvdpath, 5804 replacing ? "for" : "to", oldvdpath); 5805 5806 spa_strfree(oldvdpath); 5807 spa_strfree(newvdpath); 5808 5809 return (0); 5810 } 5811 5812 /* 5813 * Detach a device from a mirror or replacing vdev. 5814 * 5815 * If 'replace_done' is specified, only detach if the parent 5816 * is a replacing vdev. 5817 */ 5818 int 5819 spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 5820 { 5821 uint64_t txg; 5822 int error; 5823 vdev_t *rvd = spa->spa_root_vdev; 5824 vdev_t *vd, *pvd, *cvd, *tvd; 5825 boolean_t unspare = B_FALSE; 5826 uint64_t unspare_guid = 0; 5827 char *vdpath; 5828 5829 ASSERT(spa_writeable(spa)); 5830 5831 txg = spa_vdev_enter(spa); 5832 5833 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5834 5835 /* 5836 * Besides being called directly from the userland through the 5837 * ioctl interface, spa_vdev_detach() can be potentially called 5838 * at the end of spa_vdev_resilver_done(). 5839 * 5840 * In the regular case, when we have a checkpoint this shouldn't 5841 * happen as we never empty the DTLs of a vdev during the scrub 5842 * [see comment in dsl_scan_done()]. Thus spa_vdev_resilvering_done() 5843 * should never get here when we have a checkpoint. 5844 * 5845 * That said, even in a case when we checkpoint the pool exactly 5846 * as spa_vdev_resilver_done() calls this function everything 5847 * should be fine as the resilver will return right away. 5848 */ 5849 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5850 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 5851 error = (spa_has_checkpoint(spa)) ? 5852 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 5853 return (spa_vdev_exit(spa, NULL, txg, error)); 5854 } 5855 5856 if (vd == NULL) 5857 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 5858 5859 if (!vd->vdev_ops->vdev_op_leaf) 5860 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5861 5862 pvd = vd->vdev_parent; 5863 5864 /* 5865 * If the parent/child relationship is not as expected, don't do it. 5866 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 5867 * vdev that's replacing B with C. The user's intent in replacing 5868 * is to go from M(A,B) to M(A,C). If the user decides to cancel 5869 * the replace by detaching C, the expected behavior is to end up 5870 * M(A,B). But suppose that right after deciding to detach C, 5871 * the replacement of B completes. We would have M(A,C), and then 5872 * ask to detach C, which would leave us with just A -- not what 5873 * the user wanted. To prevent this, we make sure that the 5874 * parent/child relationship hasn't changed -- in this example, 5875 * that C's parent is still the replacing vdev R. 5876 */ 5877 if (pvd->vdev_guid != pguid && pguid != 0) 5878 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5879 5880 /* 5881 * Only 'replacing' or 'spare' vdevs can be replaced. 5882 */ 5883 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 5884 pvd->vdev_ops != &vdev_spare_ops) 5885 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5886 5887 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 5888 spa_version(spa) >= SPA_VERSION_SPARES); 5889 5890 /* 5891 * Only mirror, replacing, and spare vdevs support detach. 5892 */ 5893 if (pvd->vdev_ops != &vdev_replacing_ops && 5894 pvd->vdev_ops != &vdev_mirror_ops && 5895 pvd->vdev_ops != &vdev_spare_ops) 5896 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5897 5898 /* 5899 * If this device has the only valid copy of some data, 5900 * we cannot safely detach it. 5901 */ 5902 if (vdev_dtl_required(vd)) 5903 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5904 5905 ASSERT(pvd->vdev_children >= 2); 5906 5907 /* 5908 * If we are detaching the second disk from a replacing vdev, then 5909 * check to see if we changed the original vdev's path to have "/old" 5910 * at the end in spa_vdev_attach(). If so, undo that change now. 5911 */ 5912 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 5913 vd->vdev_path != NULL) { 5914 size_t len = strlen(vd->vdev_path); 5915 5916 for (int c = 0; c < pvd->vdev_children; c++) { 5917 cvd = pvd->vdev_child[c]; 5918 5919 if (cvd == vd || cvd->vdev_path == NULL) 5920 continue; 5921 5922 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 5923 strcmp(cvd->vdev_path + len, "/old") == 0) { 5924 spa_strfree(cvd->vdev_path); 5925 cvd->vdev_path = spa_strdup(vd->vdev_path); 5926 break; 5927 } 5928 } 5929 } 5930 5931 /* 5932 * If we are detaching the original disk from a spare, then it implies 5933 * that the spare should become a real disk, and be removed from the 5934 * active spare list for the pool. 5935 */ 5936 if (pvd->vdev_ops == &vdev_spare_ops && 5937 vd->vdev_id == 0 && 5938 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 5939 unspare = B_TRUE; 5940 5941 /* 5942 * Erase the disk labels so the disk can be used for other things. 5943 * This must be done after all other error cases are handled, 5944 * but before we disembowel vd (so we can still do I/O to it). 5945 * But if we can't do it, don't treat the error as fatal -- 5946 * it may be that the unwritability of the disk is the reason 5947 * it's being detached! 5948 */ 5949 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5950 5951 /* 5952 * Remove vd from its parent and compact the parent's children. 5953 */ 5954 vdev_remove_child(pvd, vd); 5955 vdev_compact_children(pvd); 5956 5957 /* 5958 * Remember one of the remaining children so we can get tvd below. 5959 */ 5960 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 5961 5962 /* 5963 * If we need to remove the remaining child from the list of hot spares, 5964 * do it now, marking the vdev as no longer a spare in the process. 5965 * We must do this before vdev_remove_parent(), because that can 5966 * change the GUID if it creates a new toplevel GUID. For a similar 5967 * reason, we must remove the spare now, in the same txg as the detach; 5968 * otherwise someone could attach a new sibling, change the GUID, and 5969 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 5970 */ 5971 if (unspare) { 5972 ASSERT(cvd->vdev_isspare); 5973 spa_spare_remove(cvd); 5974 unspare_guid = cvd->vdev_guid; 5975 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 5976 cvd->vdev_unspare = B_TRUE; 5977 } 5978 5979 /* 5980 * If the parent mirror/replacing vdev only has one child, 5981 * the parent is no longer needed. Remove it from the tree. 5982 */ 5983 if (pvd->vdev_children == 1) { 5984 if (pvd->vdev_ops == &vdev_spare_ops) 5985 cvd->vdev_unspare = B_FALSE; 5986 vdev_remove_parent(cvd); 5987 } 5988 5989 5990 /* 5991 * We don't set tvd until now because the parent we just removed 5992 * may have been the previous top-level vdev. 5993 */ 5994 tvd = cvd->vdev_top; 5995 ASSERT(tvd->vdev_parent == rvd); 5996 5997 /* 5998 * Reevaluate the parent vdev state. 5999 */ 6000 vdev_propagate_state(cvd); 6001 6002 /* 6003 * If the 'autoexpand' property is set on the pool then automatically 6004 * try to expand the size of the pool. For example if the device we 6005 * just detached was smaller than the others, it may be possible to 6006 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 6007 * first so that we can obtain the updated sizes of the leaf vdevs. 6008 */ 6009 if (spa->spa_autoexpand) { 6010 vdev_reopen(tvd); 6011 vdev_expand(tvd, txg); 6012 } 6013 6014 vdev_config_dirty(tvd); 6015 6016 /* 6017 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 6018 * vd->vdev_detached is set and free vd's DTL object in syncing context. 6019 * But first make sure we're not on any *other* txg's DTL list, to 6020 * prevent vd from being accessed after it's freed. 6021 */ 6022 vdpath = spa_strdup(vd->vdev_path); 6023 for (int t = 0; t < TXG_SIZE; t++) 6024 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 6025 vd->vdev_detached = B_TRUE; 6026 vdev_dirty(tvd, VDD_DTL, vd, txg); 6027 6028 spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_REMOVE); 6029 6030 /* hang on to the spa before we release the lock */ 6031 spa_open_ref(spa, FTAG); 6032 6033 error = spa_vdev_exit(spa, vd, txg, 0); 6034 6035 spa_history_log_internal(spa, "detach", NULL, 6036 "vdev=%s", vdpath); 6037 spa_strfree(vdpath); 6038 6039 /* 6040 * If this was the removal of the original device in a hot spare vdev, 6041 * then we want to go through and remove the device from the hot spare 6042 * list of every other pool. 6043 */ 6044 if (unspare) { 6045 spa_t *altspa = NULL; 6046 6047 mutex_enter(&spa_namespace_lock); 6048 while ((altspa = spa_next(altspa)) != NULL) { 6049 if (altspa->spa_state != POOL_STATE_ACTIVE || 6050 altspa == spa) 6051 continue; 6052 6053 spa_open_ref(altspa, FTAG); 6054 mutex_exit(&spa_namespace_lock); 6055 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 6056 mutex_enter(&spa_namespace_lock); 6057 spa_close(altspa, FTAG); 6058 } 6059 mutex_exit(&spa_namespace_lock); 6060 6061 /* search the rest of the vdevs for spares to remove */ 6062 spa_vdev_resilver_done(spa); 6063 } 6064 6065 /* all done with the spa; OK to release */ 6066 mutex_enter(&spa_namespace_lock); 6067 spa_close(spa, FTAG); 6068 mutex_exit(&spa_namespace_lock); 6069 6070 return (error); 6071 } 6072 6073 /* 6074 * Split a set of devices from their mirrors, and create a new pool from them. 6075 */ 6076 int 6077 spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 6078 nvlist_t *props, boolean_t exp) 6079 { 6080 int error = 0; 6081 uint64_t txg, *glist; 6082 spa_t *newspa; 6083 uint_t c, children, lastlog; 6084 nvlist_t **child, *nvl, *tmp; 6085 dmu_tx_t *tx; 6086 char *altroot = NULL; 6087 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 6088 boolean_t activate_slog; 6089 6090 ASSERT(spa_writeable(spa)); 6091 6092 txg = spa_vdev_enter(spa); 6093 6094 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 6095 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { 6096 error = (spa_has_checkpoint(spa)) ? 6097 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; 6098 return (spa_vdev_exit(spa, NULL, txg, error)); 6099 } 6100 6101 /* clear the log and flush everything up to now */ 6102 activate_slog = spa_passivate_log(spa); 6103 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 6104 error = spa_reset_logs(spa); 6105 txg = spa_vdev_config_enter(spa); 6106 6107 if (activate_slog) 6108 spa_activate_log(spa); 6109 6110 if (error != 0) 6111 return (spa_vdev_exit(spa, NULL, txg, error)); 6112 6113 /* check new spa name before going any further */ 6114 if (spa_lookup(newname) != NULL) 6115 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 6116 6117 /* 6118 * scan through all the children to ensure they're all mirrors 6119 */ 6120 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 6121 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 6122 &children) != 0) 6123 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 6124 6125 /* first, check to ensure we've got the right child count */ 6126 rvd = spa->spa_root_vdev; 6127 lastlog = 0; 6128 for (c = 0; c < rvd->vdev_children; c++) { 6129 vdev_t *vd = rvd->vdev_child[c]; 6130 6131 /* don't count the holes & logs as children */ 6132 if (vd->vdev_islog || !vdev_is_concrete(vd)) { 6133 if (lastlog == 0) 6134 lastlog = c; 6135 continue; 6136 } 6137 6138 lastlog = 0; 6139 } 6140 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 6141 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 6142 6143 /* next, ensure no spare or cache devices are part of the split */ 6144 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 6145 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 6146 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 6147 6148 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 6149 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 6150 6151 /* then, loop over each vdev and validate it */ 6152 for (c = 0; c < children; c++) { 6153 uint64_t is_hole = 0; 6154 6155 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 6156 &is_hole); 6157 6158 if (is_hole != 0) { 6159 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 6160 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 6161 continue; 6162 } else { 6163 error = SET_ERROR(EINVAL); 6164 break; 6165 } 6166 } 6167 6168 /* which disk is going to be split? */ 6169 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 6170 &glist[c]) != 0) { 6171 error = SET_ERROR(EINVAL); 6172 break; 6173 } 6174 6175 /* look it up in the spa */ 6176 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 6177 if (vml[c] == NULL) { 6178 error = SET_ERROR(ENODEV); 6179 break; 6180 } 6181 6182 /* make sure there's nothing stopping the split */ 6183 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 6184 vml[c]->vdev_islog || 6185 !vdev_is_concrete(vml[c]) || 6186 vml[c]->vdev_isspare || 6187 vml[c]->vdev_isl2cache || 6188 !vdev_writeable(vml[c]) || 6189 vml[c]->vdev_children != 0 || 6190 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 6191 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 6192 error = SET_ERROR(EINVAL); 6193 break; 6194 } 6195 6196 if (vdev_dtl_required(vml[c])) { 6197 error = SET_ERROR(EBUSY); 6198 break; 6199 } 6200 6201 /* we need certain info from the top level */ 6202 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 6203 vml[c]->vdev_top->vdev_ms_array) == 0); 6204 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 6205 vml[c]->vdev_top->vdev_ms_shift) == 0); 6206 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 6207 vml[c]->vdev_top->vdev_asize) == 0); 6208 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 6209 vml[c]->vdev_top->vdev_ashift) == 0); 6210 6211 /* transfer per-vdev ZAPs */ 6212 ASSERT3U(vml[c]->vdev_leaf_zap, !=, 0); 6213 VERIFY0(nvlist_add_uint64(child[c], 6214 ZPOOL_CONFIG_VDEV_LEAF_ZAP, vml[c]->vdev_leaf_zap)); 6215 6216 ASSERT3U(vml[c]->vdev_top->vdev_top_zap, !=, 0); 6217 VERIFY0(nvlist_add_uint64(child[c], 6218 ZPOOL_CONFIG_VDEV_TOP_ZAP, 6219 vml[c]->vdev_parent->vdev_top_zap)); 6220 } 6221 6222 if (error != 0) { 6223 kmem_free(vml, children * sizeof (vdev_t *)); 6224 kmem_free(glist, children * sizeof (uint64_t)); 6225 return (spa_vdev_exit(spa, NULL, txg, error)); 6226 } 6227 6228 /* stop writers from using the disks */ 6229 for (c = 0; c < children; c++) { 6230 if (vml[c] != NULL) 6231 vml[c]->vdev_offline = B_TRUE; 6232 } 6233 vdev_reopen(spa->spa_root_vdev); 6234 6235 /* 6236 * Temporarily record the splitting vdevs in the spa config. This 6237 * will disappear once the config is regenerated. 6238 */ 6239 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6240 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 6241 glist, children) == 0); 6242 kmem_free(glist, children * sizeof (uint64_t)); 6243 6244 mutex_enter(&spa->spa_props_lock); 6245 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 6246 nvl) == 0); 6247 mutex_exit(&spa->spa_props_lock); 6248 spa->spa_config_splitting = nvl; 6249 vdev_config_dirty(spa->spa_root_vdev); 6250 6251 /* configure and create the new pool */ 6252 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 6253 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 6254 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 6255 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6256 spa_version(spa)) == 0); 6257 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 6258 spa->spa_config_txg) == 0); 6259 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 6260 spa_generate_guid(NULL)) == 0); 6261 VERIFY0(nvlist_add_boolean(config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); 6262 (void) nvlist_lookup_string(props, 6263 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 6264 6265 /* add the new pool to the namespace */ 6266 newspa = spa_add(newname, config, altroot); 6267 newspa->spa_avz_action = AVZ_ACTION_REBUILD; 6268 newspa->spa_config_txg = spa->spa_config_txg; 6269 spa_set_log_state(newspa, SPA_LOG_CLEAR); 6270 6271 /* release the spa config lock, retaining the namespace lock */ 6272 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 6273 6274 if (zio_injection_enabled) 6275 zio_handle_panic_injection(spa, FTAG, 1); 6276 6277 spa_activate(newspa, spa_mode_global); 6278 spa_async_suspend(newspa); 6279 6280 newspa->spa_config_source = SPA_CONFIG_SRC_SPLIT; 6281 6282 /* create the new pool from the disks of the original pool */ 6283 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE); 6284 if (error) 6285 goto out; 6286 6287 /* if that worked, generate a real config for the new pool */ 6288 if (newspa->spa_root_vdev != NULL) { 6289 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 6290 NV_UNIQUE_NAME, KM_SLEEP) == 0); 6291 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 6292 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 6293 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 6294 B_TRUE)); 6295 } 6296 6297 /* set the props */ 6298 if (props != NULL) { 6299 spa_configfile_set(newspa, props, B_FALSE); 6300 error = spa_prop_set(newspa, props); 6301 if (error) 6302 goto out; 6303 } 6304 6305 /* flush everything */ 6306 txg = spa_vdev_config_enter(newspa); 6307 vdev_config_dirty(newspa->spa_root_vdev); 6308 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 6309 6310 if (zio_injection_enabled) 6311 zio_handle_panic_injection(spa, FTAG, 2); 6312 6313 spa_async_resume(newspa); 6314 6315 /* finally, update the original pool's config */ 6316 txg = spa_vdev_config_enter(spa); 6317 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 6318 error = dmu_tx_assign(tx, TXG_WAIT); 6319 if (error != 0) 6320 dmu_tx_abort(tx); 6321 for (c = 0; c < children; c++) { 6322 if (vml[c] != NULL) { 6323 vdev_split(vml[c]); 6324 if (error == 0) 6325 spa_history_log_internal(spa, "detach", tx, 6326 "vdev=%s", vml[c]->vdev_path); 6327 6328 vdev_free(vml[c]); 6329 } 6330 } 6331 spa->spa_avz_action = AVZ_ACTION_REBUILD; 6332 vdev_config_dirty(spa->spa_root_vdev); 6333 spa->spa_config_splitting = NULL; 6334 nvlist_free(nvl); 6335 if (error == 0) 6336 dmu_tx_commit(tx); 6337 (void) spa_vdev_exit(spa, NULL, txg, 0); 6338 6339 if (zio_injection_enabled) 6340 zio_handle_panic_injection(spa, FTAG, 3); 6341 6342 /* split is complete; log a history record */ 6343 spa_history_log_internal(newspa, "split", NULL, 6344 "from pool %s", spa_name(spa)); 6345 6346 kmem_free(vml, children * sizeof (vdev_t *)); 6347 6348 /* if we're not going to mount the filesystems in userland, export */ 6349 if (exp) 6350 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 6351 B_FALSE, B_FALSE); 6352 6353 return (error); 6354 6355 out: 6356 spa_unload(newspa); 6357 spa_deactivate(newspa); 6358 spa_remove(newspa); 6359 6360 txg = spa_vdev_config_enter(spa); 6361 6362 /* re-online all offlined disks */ 6363 for (c = 0; c < children; c++) { 6364 if (vml[c] != NULL) 6365 vml[c]->vdev_offline = B_FALSE; 6366 } 6367 vdev_reopen(spa->spa_root_vdev); 6368 6369 nvlist_free(spa->spa_config_splitting); 6370 spa->spa_config_splitting = NULL; 6371 (void) spa_vdev_exit(spa, NULL, txg, error); 6372 6373 kmem_free(vml, children * sizeof (vdev_t *)); 6374 return (error); 6375 } 6376 6377 /* 6378 * Find any device that's done replacing, or a vdev marked 'unspare' that's 6379 * currently spared, so we can detach it. 6380 */ 6381 static vdev_t * 6382 spa_vdev_resilver_done_hunt(vdev_t *vd) 6383 { 6384 vdev_t *newvd, *oldvd; 6385 6386 for (int c = 0; c < vd->vdev_children; c++) { 6387 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 6388 if (oldvd != NULL) 6389 return (oldvd); 6390 } 6391 6392 /* 6393 * Check for a completed replacement. We always consider the first 6394 * vdev in the list to be the oldest vdev, and the last one to be 6395 * the newest (see spa_vdev_attach() for how that works). In 6396 * the case where the newest vdev is faulted, we will not automatically 6397 * remove it after a resilver completes. This is OK as it will require 6398 * user intervention to determine which disk the admin wishes to keep. 6399 */ 6400 if (vd->vdev_ops == &vdev_replacing_ops) { 6401 ASSERT(vd->vdev_children > 1); 6402 6403 newvd = vd->vdev_child[vd->vdev_children - 1]; 6404 oldvd = vd->vdev_child[0]; 6405 6406 if (vdev_dtl_empty(newvd, DTL_MISSING) && 6407 vdev_dtl_empty(newvd, DTL_OUTAGE) && 6408 !vdev_dtl_required(oldvd)) 6409 return (oldvd); 6410 } 6411 6412 /* 6413 * Check for a completed resilver with the 'unspare' flag set. 6414 */ 6415 if (vd->vdev_ops == &vdev_spare_ops) { 6416 vdev_t *first = vd->vdev_child[0]; 6417 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 6418 6419 if (last->vdev_unspare) { 6420 oldvd = first; 6421 newvd = last; 6422 } else if (first->vdev_unspare) { 6423 oldvd = last; 6424 newvd = first; 6425 } else { 6426 oldvd = NULL; 6427 } 6428 6429 if (oldvd != NULL && 6430 vdev_dtl_empty(newvd, DTL_MISSING) && 6431 vdev_dtl_empty(newvd, DTL_OUTAGE) && 6432 !vdev_dtl_required(oldvd)) 6433 return (oldvd); 6434 6435 /* 6436 * If there are more than two spares attached to a disk, 6437 * and those spares are not required, then we want to 6438 * attempt to free them up now so that they can be used 6439 * by other pools. Once we're back down to a single 6440 * disk+spare, we stop removing them. 6441 */ 6442 if (vd->vdev_children > 2) { 6443 newvd = vd->vdev_child[1]; 6444 6445 if (newvd->vdev_isspare && last->vdev_isspare && 6446 vdev_dtl_empty(last, DTL_MISSING) && 6447 vdev_dtl_empty(last, DTL_OUTAGE) && 6448 !vdev_dtl_required(newvd)) 6449 return (newvd); 6450 } 6451 } 6452 6453 return (NULL); 6454 } 6455 6456 static void 6457 spa_vdev_resilver_done(spa_t *spa) 6458 { 6459 vdev_t *vd, *pvd, *ppvd; 6460 uint64_t guid, sguid, pguid, ppguid; 6461 6462 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6463 6464 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 6465 pvd = vd->vdev_parent; 6466 ppvd = pvd->vdev_parent; 6467 guid = vd->vdev_guid; 6468 pguid = pvd->vdev_guid; 6469 ppguid = ppvd->vdev_guid; 6470 sguid = 0; 6471 /* 6472 * If we have just finished replacing a hot spared device, then 6473 * we need to detach the parent's first child (the original hot 6474 * spare) as well. 6475 */ 6476 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 6477 ppvd->vdev_children == 2) { 6478 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 6479 sguid = ppvd->vdev_child[1]->vdev_guid; 6480 } 6481 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 6482 6483 spa_config_exit(spa, SCL_ALL, FTAG); 6484 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 6485 return; 6486 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 6487 return; 6488 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6489 } 6490 6491 spa_config_exit(spa, SCL_ALL, FTAG); 6492 } 6493 6494 /* 6495 * Update the stored path or FRU for this vdev. 6496 */ 6497 int 6498 spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 6499 boolean_t ispath) 6500 { 6501 vdev_t *vd; 6502 boolean_t sync = B_FALSE; 6503 6504 ASSERT(spa_writeable(spa)); 6505 6506 spa_vdev_state_enter(spa, SCL_ALL); 6507 6508 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 6509 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 6510 6511 if (!vd->vdev_ops->vdev_op_leaf) 6512 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 6513 6514 if (ispath) { 6515 if (strcmp(value, vd->vdev_path) != 0) { 6516 spa_strfree(vd->vdev_path); 6517 vd->vdev_path = spa_strdup(value); 6518 sync = B_TRUE; 6519 } 6520 } else { 6521 if (vd->vdev_fru == NULL) { 6522 vd->vdev_fru = spa_strdup(value); 6523 sync = B_TRUE; 6524 } else if (strcmp(value, vd->vdev_fru) != 0) { 6525 spa_strfree(vd->vdev_fru); 6526 vd->vdev_fru = spa_strdup(value); 6527 sync = B_TRUE; 6528 } 6529 } 6530 6531 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 6532 } 6533 6534 int 6535 spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 6536 { 6537 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 6538 } 6539 6540 int 6541 spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 6542 { 6543 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 6544 } 6545 6546 /* 6547 * ========================================================================== 6548 * SPA Scanning 6549 * ========================================================================== 6550 */ 6551 int 6552 spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t cmd) 6553 { 6554 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 6555 6556 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 6557 return (SET_ERROR(EBUSY)); 6558 6559 return (dsl_scrub_set_pause_resume(spa->spa_dsl_pool, cmd)); 6560 } 6561 6562 int 6563 spa_scan_stop(spa_t *spa) 6564 { 6565 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 6566 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 6567 return (SET_ERROR(EBUSY)); 6568 return (dsl_scan_cancel(spa->spa_dsl_pool)); 6569 } 6570 6571 int 6572 spa_scan(spa_t *spa, pool_scan_func_t func) 6573 { 6574 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 6575 6576 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 6577 return (SET_ERROR(ENOTSUP)); 6578 6579 /* 6580 * If a resilver was requested, but there is no DTL on a 6581 * writeable leaf device, we have nothing to do. 6582 */ 6583 if (func == POOL_SCAN_RESILVER && 6584 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 6585 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 6586 return (0); 6587 } 6588 6589 return (dsl_scan(spa->spa_dsl_pool, func)); 6590 } 6591 6592 /* 6593 * ========================================================================== 6594 * SPA async task processing 6595 * ========================================================================== 6596 */ 6597 6598 static void 6599 spa_async_remove(spa_t *spa, vdev_t *vd) 6600 { 6601 if (vd->vdev_remove_wanted) { 6602 vd->vdev_remove_wanted = B_FALSE; 6603 vd->vdev_delayed_close = B_FALSE; 6604 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 6605 6606 /* 6607 * We want to clear the stats, but we don't want to do a full 6608 * vdev_clear() as that will cause us to throw away 6609 * degraded/faulted state as well as attempt to reopen the 6610 * device, all of which is a waste. 6611 */ 6612 vd->vdev_stat.vs_read_errors = 0; 6613 vd->vdev_stat.vs_write_errors = 0; 6614 vd->vdev_stat.vs_checksum_errors = 0; 6615 6616 vdev_state_dirty(vd->vdev_top); 6617 } 6618 6619 for (int c = 0; c < vd->vdev_children; c++) 6620 spa_async_remove(spa, vd->vdev_child[c]); 6621 } 6622 6623 static void 6624 spa_async_probe(spa_t *spa, vdev_t *vd) 6625 { 6626 if (vd->vdev_probe_wanted) { 6627 vd->vdev_probe_wanted = B_FALSE; 6628 vdev_reopen(vd); /* vdev_open() does the actual probe */ 6629 } 6630 6631 for (int c = 0; c < vd->vdev_children; c++) 6632 spa_async_probe(spa, vd->vdev_child[c]); 6633 } 6634 6635 static void 6636 spa_async_autoexpand(spa_t *spa, vdev_t *vd) 6637 { 6638 sysevent_id_t eid; 6639 nvlist_t *attr; 6640 char *physpath; 6641 6642 if (!spa->spa_autoexpand) 6643 return; 6644 6645 for (int c = 0; c < vd->vdev_children; c++) { 6646 vdev_t *cvd = vd->vdev_child[c]; 6647 spa_async_autoexpand(spa, cvd); 6648 } 6649 6650 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 6651 return; 6652 6653 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 6654 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 6655 6656 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6657 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 6658 6659 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 6660 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 6661 6662 nvlist_free(attr); 6663 kmem_free(physpath, MAXPATHLEN); 6664 } 6665 6666 static void 6667 spa_async_thread(void *arg) 6668 { 6669 spa_t *spa = (spa_t *)arg; 6670 int tasks; 6671 6672 ASSERT(spa->spa_sync_on); 6673 6674 mutex_enter(&spa->spa_async_lock); 6675 tasks = spa->spa_async_tasks; 6676 spa->spa_async_tasks = 0; 6677 mutex_exit(&spa->spa_async_lock); 6678 6679 /* 6680 * See if the config needs to be updated. 6681 */ 6682 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 6683 uint64_t old_space, new_space; 6684 6685 mutex_enter(&spa_namespace_lock); 6686 old_space = metaslab_class_get_space(spa_normal_class(spa)); 6687 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 6688 new_space = metaslab_class_get_space(spa_normal_class(spa)); 6689 mutex_exit(&spa_namespace_lock); 6690 6691 /* 6692 * If the pool grew as a result of the config update, 6693 * then log an internal history event. 6694 */ 6695 if (new_space != old_space) { 6696 spa_history_log_internal(spa, "vdev online", NULL, 6697 "pool '%s' size: %llu(+%llu)", 6698 spa_name(spa), new_space, new_space - old_space); 6699 } 6700 } 6701 6702 /* 6703 * See if any devices need to be marked REMOVED. 6704 */ 6705 if (tasks & SPA_ASYNC_REMOVE) { 6706 spa_vdev_state_enter(spa, SCL_NONE); 6707 spa_async_remove(spa, spa->spa_root_vdev); 6708 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 6709 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 6710 for (int i = 0; i < spa->spa_spares.sav_count; i++) 6711 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 6712 (void) spa_vdev_state_exit(spa, NULL, 0); 6713 } 6714 6715 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 6716 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6717 spa_async_autoexpand(spa, spa->spa_root_vdev); 6718 spa_config_exit(spa, SCL_CONFIG, FTAG); 6719 } 6720 6721 /* 6722 * See if any devices need to be probed. 6723 */ 6724 if (tasks & SPA_ASYNC_PROBE) { 6725 spa_vdev_state_enter(spa, SCL_NONE); 6726 spa_async_probe(spa, spa->spa_root_vdev); 6727 (void) spa_vdev_state_exit(spa, NULL, 0); 6728 } 6729 6730 /* 6731 * If any devices are done replacing, detach them. 6732 */ 6733 if (tasks & SPA_ASYNC_RESILVER_DONE) 6734 spa_vdev_resilver_done(spa); 6735 6736 /* 6737 * Kick off a resilver. 6738 */ 6739 if (tasks & SPA_ASYNC_RESILVER) 6740 dsl_resilver_restart(spa->spa_dsl_pool, 0); 6741 6742 /* 6743 * Let the world know that we're done. 6744 */ 6745 mutex_enter(&spa->spa_async_lock); 6746 spa->spa_async_thread = NULL; 6747 cv_broadcast(&spa->spa_async_cv); 6748 mutex_exit(&spa->spa_async_lock); 6749 thread_exit(); 6750 } 6751 6752 void 6753 spa_async_suspend(spa_t *spa) 6754 { 6755 mutex_enter(&spa->spa_async_lock); 6756 spa->spa_async_suspended++; 6757 while (spa->spa_async_thread != NULL) 6758 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 6759 mutex_exit(&spa->spa_async_lock); 6760 6761 spa_vdev_remove_suspend(spa); 6762 6763 zthr_t *condense_thread = spa->spa_condense_zthr; 6764 if (condense_thread != NULL && zthr_isrunning(condense_thread)) 6765 VERIFY0(zthr_cancel(condense_thread)); 6766 6767 zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr; 6768 if (discard_thread != NULL && zthr_isrunning(discard_thread)) 6769 VERIFY0(zthr_cancel(discard_thread)); 6770 } 6771 6772 void 6773 spa_async_resume(spa_t *spa) 6774 { 6775 mutex_enter(&spa->spa_async_lock); 6776 ASSERT(spa->spa_async_suspended != 0); 6777 spa->spa_async_suspended--; 6778 mutex_exit(&spa->spa_async_lock); 6779 spa_restart_removal(spa); 6780 6781 zthr_t *condense_thread = spa->spa_condense_zthr; 6782 if (condense_thread != NULL && !zthr_isrunning(condense_thread)) 6783 zthr_resume(condense_thread); 6784 6785 zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr; 6786 if (discard_thread != NULL && !zthr_isrunning(discard_thread)) 6787 zthr_resume(discard_thread); 6788 } 6789 6790 static boolean_t 6791 spa_async_tasks_pending(spa_t *spa) 6792 { 6793 uint_t non_config_tasks; 6794 uint_t config_task; 6795 boolean_t config_task_suspended; 6796 6797 non_config_tasks = spa->spa_async_tasks & ~SPA_ASYNC_CONFIG_UPDATE; 6798 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 6799 if (spa->spa_ccw_fail_time == 0) { 6800 config_task_suspended = B_FALSE; 6801 } else { 6802 config_task_suspended = 6803 (gethrtime() - spa->spa_ccw_fail_time) < 6804 (zfs_ccw_retry_interval * NANOSEC); 6805 } 6806 6807 return (non_config_tasks || (config_task && !config_task_suspended)); 6808 } 6809 6810 static void 6811 spa_async_dispatch(spa_t *spa) 6812 { 6813 mutex_enter(&spa->spa_async_lock); 6814 if (spa_async_tasks_pending(spa) && 6815 !spa->spa_async_suspended && 6816 spa->spa_async_thread == NULL && 6817 rootdir != NULL) 6818 spa->spa_async_thread = thread_create(NULL, 0, 6819 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 6820 mutex_exit(&spa->spa_async_lock); 6821 } 6822 6823 void 6824 spa_async_request(spa_t *spa, int task) 6825 { 6826 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 6827 mutex_enter(&spa->spa_async_lock); 6828 spa->spa_async_tasks |= task; 6829 mutex_exit(&spa->spa_async_lock); 6830 } 6831 6832 /* 6833 * ========================================================================== 6834 * SPA syncing routines 6835 * ========================================================================== 6836 */ 6837 6838 static int 6839 bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6840 { 6841 bpobj_t *bpo = arg; 6842 bpobj_enqueue(bpo, bp, tx); 6843 return (0); 6844 } 6845 6846 static int 6847 spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6848 { 6849 zio_t *zio = arg; 6850 6851 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 6852 zio->io_flags)); 6853 return (0); 6854 } 6855 6856 /* 6857 * Note: this simple function is not inlined to make it easier to dtrace the 6858 * amount of time spent syncing frees. 6859 */ 6860 static void 6861 spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 6862 { 6863 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6864 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 6865 VERIFY(zio_wait(zio) == 0); 6866 } 6867 6868 /* 6869 * Note: this simple function is not inlined to make it easier to dtrace the 6870 * amount of time spent syncing deferred frees. 6871 */ 6872 static void 6873 spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 6874 { 6875 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6876 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 6877 spa_free_sync_cb, zio, tx), ==, 0); 6878 VERIFY0(zio_wait(zio)); 6879 } 6880 6881 6882 static void 6883 spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 6884 { 6885 char *packed = NULL; 6886 size_t bufsize; 6887 size_t nvsize = 0; 6888 dmu_buf_t *db; 6889 6890 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 6891 6892 /* 6893 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 6894 * information. This avoids the dmu_buf_will_dirty() path and 6895 * saves us a pre-read to get data we don't actually care about. 6896 */ 6897 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 6898 packed = kmem_alloc(bufsize, KM_SLEEP); 6899 6900 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 6901 KM_SLEEP) == 0); 6902 bzero(packed + nvsize, bufsize - nvsize); 6903 6904 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 6905 6906 kmem_free(packed, bufsize); 6907 6908 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 6909 dmu_buf_will_dirty(db, tx); 6910 *(uint64_t *)db->db_data = nvsize; 6911 dmu_buf_rele(db, FTAG); 6912 } 6913 6914 static void 6915 spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 6916 const char *config, const char *entry) 6917 { 6918 nvlist_t *nvroot; 6919 nvlist_t **list; 6920 int i; 6921 6922 if (!sav->sav_sync) 6923 return; 6924 6925 /* 6926 * Update the MOS nvlist describing the list of available devices. 6927 * spa_validate_aux() will have already made sure this nvlist is 6928 * valid and the vdevs are labeled appropriately. 6929 */ 6930 if (sav->sav_object == 0) { 6931 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 6932 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 6933 sizeof (uint64_t), tx); 6934 VERIFY(zap_update(spa->spa_meta_objset, 6935 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 6936 &sav->sav_object, tx) == 0); 6937 } 6938 6939 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6940 if (sav->sav_count == 0) { 6941 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 6942 } else { 6943 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 6944 for (i = 0; i < sav->sav_count; i++) 6945 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 6946 B_FALSE, VDEV_CONFIG_L2CACHE); 6947 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 6948 sav->sav_count) == 0); 6949 for (i = 0; i < sav->sav_count; i++) 6950 nvlist_free(list[i]); 6951 kmem_free(list, sav->sav_count * sizeof (void *)); 6952 } 6953 6954 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 6955 nvlist_free(nvroot); 6956 6957 sav->sav_sync = B_FALSE; 6958 } 6959 6960 /* 6961 * Rebuild spa's all-vdev ZAP from the vdev ZAPs indicated in each vdev_t. 6962 * The all-vdev ZAP must be empty. 6963 */ 6964 static void 6965 spa_avz_build(vdev_t *vd, uint64_t avz, dmu_tx_t *tx) 6966 { 6967 spa_t *spa = vd->vdev_spa; 6968 if (vd->vdev_top_zap != 0) { 6969 VERIFY0(zap_add_int(spa->spa_meta_objset, avz, 6970 vd->vdev_top_zap, tx)); 6971 } 6972 if (vd->vdev_leaf_zap != 0) { 6973 VERIFY0(zap_add_int(spa->spa_meta_objset, avz, 6974 vd->vdev_leaf_zap, tx)); 6975 } 6976 for (uint64_t i = 0; i < vd->vdev_children; i++) { 6977 spa_avz_build(vd->vdev_child[i], avz, tx); 6978 } 6979 } 6980 6981 static void 6982 spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 6983 { 6984 nvlist_t *config; 6985 6986 /* 6987 * If the pool is being imported from a pre-per-vdev-ZAP version of ZFS, 6988 * its config may not be dirty but we still need to build per-vdev ZAPs. 6989 * Similarly, if the pool is being assembled (e.g. after a split), we 6990 * need to rebuild the AVZ although the config may not be dirty. 6991 */ 6992 if (list_is_empty(&spa->spa_config_dirty_list) && 6993 spa->spa_avz_action == AVZ_ACTION_NONE) 6994 return; 6995 6996 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6997 6998 ASSERT(spa->spa_avz_action == AVZ_ACTION_NONE || 6999 spa->spa_avz_action == AVZ_ACTION_INITIALIZE || 7000 spa->spa_all_vdev_zaps != 0); 7001 7002 if (spa->spa_avz_action == AVZ_ACTION_REBUILD) { 7003 /* Make and build the new AVZ */ 7004 uint64_t new_avz = zap_create(spa->spa_meta_objset, 7005 DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx); 7006 spa_avz_build(spa->spa_root_vdev, new_avz, tx); 7007 7008 /* Diff old AVZ with new one */ 7009 zap_cursor_t zc; 7010 zap_attribute_t za; 7011 7012 for (zap_cursor_init(&zc, spa->spa_meta_objset, 7013 spa->spa_all_vdev_zaps); 7014 zap_cursor_retrieve(&zc, &za) == 0; 7015 zap_cursor_advance(&zc)) { 7016 uint64_t vdzap = za.za_first_integer; 7017 if (zap_lookup_int(spa->spa_meta_objset, new_avz, 7018 vdzap) == ENOENT) { 7019 /* 7020 * ZAP is listed in old AVZ but not in new one; 7021 * destroy it 7022 */ 7023 VERIFY0(zap_destroy(spa->spa_meta_objset, vdzap, 7024 tx)); 7025 } 7026 } 7027 7028 zap_cursor_fini(&zc); 7029 7030 /* Destroy the old AVZ */ 7031 VERIFY0(zap_destroy(spa->spa_meta_objset, 7032 spa->spa_all_vdev_zaps, tx)); 7033 7034 /* Replace the old AVZ in the dir obj with the new one */ 7035 VERIFY0(zap_update(spa->spa_meta_objset, 7036 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, 7037 sizeof (new_avz), 1, &new_avz, tx)); 7038 7039 spa->spa_all_vdev_zaps = new_avz; 7040 } else if (spa->spa_avz_action == AVZ_ACTION_DESTROY) { 7041 zap_cursor_t zc; 7042 zap_attribute_t za; 7043 7044 /* Walk through the AVZ and destroy all listed ZAPs */ 7045 for (zap_cursor_init(&zc, spa->spa_meta_objset, 7046 spa->spa_all_vdev_zaps); 7047 zap_cursor_retrieve(&zc, &za) == 0; 7048 zap_cursor_advance(&zc)) { 7049 uint64_t zap = za.za_first_integer; 7050 VERIFY0(zap_destroy(spa->spa_meta_objset, zap, tx)); 7051 } 7052 7053 zap_cursor_fini(&zc); 7054 7055 /* Destroy and unlink the AVZ itself */ 7056 VERIFY0(zap_destroy(spa->spa_meta_objset, 7057 spa->spa_all_vdev_zaps, tx)); 7058 VERIFY0(zap_remove(spa->spa_meta_objset, 7059 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, tx)); 7060 spa->spa_all_vdev_zaps = 0; 7061 } 7062 7063 if (spa->spa_all_vdev_zaps == 0) { 7064 spa->spa_all_vdev_zaps = zap_create_link(spa->spa_meta_objset, 7065 DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT, 7066 DMU_POOL_VDEV_ZAP_MAP, tx); 7067 } 7068 spa->spa_avz_action = AVZ_ACTION_NONE; 7069 7070 /* Create ZAPs for vdevs that don't have them. */ 7071 vdev_construct_zaps(spa->spa_root_vdev, tx); 7072 7073 config = spa_config_generate(spa, spa->spa_root_vdev, 7074 dmu_tx_get_txg(tx), B_FALSE); 7075 7076 /* 7077 * If we're upgrading the spa version then make sure that 7078 * the config object gets updated with the correct version. 7079 */ 7080 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 7081 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 7082 spa->spa_uberblock.ub_version); 7083 7084 spa_config_exit(spa, SCL_STATE, FTAG); 7085 7086 nvlist_free(spa->spa_config_syncing); 7087 spa->spa_config_syncing = config; 7088 7089 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 7090 } 7091 7092 static void 7093 spa_sync_version(void *arg, dmu_tx_t *tx) 7094 { 7095 uint64_t *versionp = arg; 7096 uint64_t version = *versionp; 7097 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 7098 7099 /* 7100 * Setting the version is special cased when first creating the pool. 7101 */ 7102 ASSERT(tx->tx_txg != TXG_INITIAL); 7103 7104 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 7105 ASSERT(version >= spa_version(spa)); 7106 7107 spa->spa_uberblock.ub_version = version; 7108 vdev_config_dirty(spa->spa_root_vdev); 7109 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 7110 } 7111 7112 /* 7113 * Set zpool properties. 7114 */ 7115 static void 7116 spa_sync_props(void *arg, dmu_tx_t *tx) 7117 { 7118 nvlist_t *nvp = arg; 7119 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 7120 objset_t *mos = spa->spa_meta_objset; 7121 nvpair_t *elem = NULL; 7122 7123 mutex_enter(&spa->spa_props_lock); 7124 7125 while ((elem = nvlist_next_nvpair(nvp, elem))) { 7126 uint64_t intval; 7127 char *strval, *fname; 7128 zpool_prop_t prop; 7129 const char *propname; 7130 zprop_type_t proptype; 7131 spa_feature_t fid; 7132 7133 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 7134 case ZPOOL_PROP_INVAL: 7135 /* 7136 * We checked this earlier in spa_prop_validate(). 7137 */ 7138 ASSERT(zpool_prop_feature(nvpair_name(elem))); 7139 7140 fname = strchr(nvpair_name(elem), '@') + 1; 7141 VERIFY0(zfeature_lookup_name(fname, &fid)); 7142 7143 spa_feature_enable(spa, fid, tx); 7144 spa_history_log_internal(spa, "set", tx, 7145 "%s=enabled", nvpair_name(elem)); 7146 break; 7147 7148 case ZPOOL_PROP_VERSION: 7149 intval = fnvpair_value_uint64(elem); 7150 /* 7151 * The version is synced seperatly before other 7152 * properties and should be correct by now. 7153 */ 7154 ASSERT3U(spa_version(spa), >=, intval); 7155 break; 7156 7157 case ZPOOL_PROP_ALTROOT: 7158 /* 7159 * 'altroot' is a non-persistent property. It should 7160 * have been set temporarily at creation or import time. 7161 */ 7162 ASSERT(spa->spa_root != NULL); 7163 break; 7164 7165 case ZPOOL_PROP_READONLY: 7166 case ZPOOL_PROP_CACHEFILE: 7167 /* 7168 * 'readonly' and 'cachefile' are also non-persisitent 7169 * properties. 7170 */ 7171 break; 7172 case ZPOOL_PROP_COMMENT: 7173 strval = fnvpair_value_string(elem); 7174 if (spa->spa_comment != NULL) 7175 spa_strfree(spa->spa_comment); 7176 spa->spa_comment = spa_strdup(strval); 7177 /* 7178 * We need to dirty the configuration on all the vdevs 7179 * so that their labels get updated. It's unnecessary 7180 * to do this for pool creation since the vdev's 7181 * configuratoin has already been dirtied. 7182 */ 7183 if (tx->tx_txg != TXG_INITIAL) 7184 vdev_config_dirty(spa->spa_root_vdev); 7185 spa_history_log_internal(spa, "set", tx, 7186 "%s=%s", nvpair_name(elem), strval); 7187 break; 7188 default: 7189 /* 7190 * Set pool property values in the poolprops mos object. 7191 */ 7192 if (spa->spa_pool_props_object == 0) { 7193 spa->spa_pool_props_object = 7194 zap_create_link(mos, DMU_OT_POOL_PROPS, 7195 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 7196 tx); 7197 } 7198 7199 /* normalize the property name */ 7200 propname = zpool_prop_to_name(prop); 7201 proptype = zpool_prop_get_type(prop); 7202 7203 if (nvpair_type(elem) == DATA_TYPE_STRING) { 7204 ASSERT(proptype == PROP_TYPE_STRING); 7205 strval = fnvpair_value_string(elem); 7206 VERIFY0(zap_update(mos, 7207 spa->spa_pool_props_object, propname, 7208 1, strlen(strval) + 1, strval, tx)); 7209 spa_history_log_internal(spa, "set", tx, 7210 "%s=%s", nvpair_name(elem), strval); 7211 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 7212 intval = fnvpair_value_uint64(elem); 7213 7214 if (proptype == PROP_TYPE_INDEX) { 7215 const char *unused; 7216 VERIFY0(zpool_prop_index_to_string( 7217 prop, intval, &unused)); 7218 } 7219 VERIFY0(zap_update(mos, 7220 spa->spa_pool_props_object, propname, 7221 8, 1, &intval, tx)); 7222 spa_history_log_internal(spa, "set", tx, 7223 "%s=%lld", nvpair_name(elem), intval); 7224 } else { 7225 ASSERT(0); /* not allowed */ 7226 } 7227 7228 switch (prop) { 7229 case ZPOOL_PROP_DELEGATION: 7230 spa->spa_delegation = intval; 7231 break; 7232 case ZPOOL_PROP_BOOTFS: 7233 spa->spa_bootfs = intval; 7234 break; 7235 case ZPOOL_PROP_FAILUREMODE: 7236 spa->spa_failmode = intval; 7237 break; 7238 case ZPOOL_PROP_AUTOEXPAND: 7239 spa->spa_autoexpand = intval; 7240 if (tx->tx_txg != TXG_INITIAL) 7241 spa_async_request(spa, 7242 SPA_ASYNC_AUTOEXPAND); 7243 break; 7244 case ZPOOL_PROP_DEDUPDITTO: 7245 spa->spa_dedup_ditto = intval; 7246 break; 7247 default: 7248 break; 7249 } 7250 } 7251 7252 } 7253 7254 mutex_exit(&spa->spa_props_lock); 7255 } 7256 7257 /* 7258 * Perform one-time upgrade on-disk changes. spa_version() does not 7259 * reflect the new version this txg, so there must be no changes this 7260 * txg to anything that the upgrade code depends on after it executes. 7261 * Therefore this must be called after dsl_pool_sync() does the sync 7262 * tasks. 7263 */ 7264 static void 7265 spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 7266 { 7267 dsl_pool_t *dp = spa->spa_dsl_pool; 7268 7269 ASSERT(spa->spa_sync_pass == 1); 7270 7271 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 7272 7273 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 7274 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 7275 dsl_pool_create_origin(dp, tx); 7276 7277 /* Keeping the origin open increases spa_minref */ 7278 spa->spa_minref += 3; 7279 } 7280 7281 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 7282 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 7283 dsl_pool_upgrade_clones(dp, tx); 7284 } 7285 7286 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 7287 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 7288 dsl_pool_upgrade_dir_clones(dp, tx); 7289 7290 /* Keeping the freedir open increases spa_minref */ 7291 spa->spa_minref += 3; 7292 } 7293 7294 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 7295 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 7296 spa_feature_create_zap_objects(spa, tx); 7297 } 7298 7299 /* 7300 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 7301 * when possibility to use lz4 compression for metadata was added 7302 * Old pools that have this feature enabled must be upgraded to have 7303 * this feature active 7304 */ 7305 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 7306 boolean_t lz4_en = spa_feature_is_enabled(spa, 7307 SPA_FEATURE_LZ4_COMPRESS); 7308 boolean_t lz4_ac = spa_feature_is_active(spa, 7309 SPA_FEATURE_LZ4_COMPRESS); 7310 7311 if (lz4_en && !lz4_ac) 7312 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 7313 } 7314 7315 /* 7316 * If we haven't written the salt, do so now. Note that the 7317 * feature may not be activated yet, but that's fine since 7318 * the presence of this ZAP entry is backwards compatible. 7319 */ 7320 if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 7321 DMU_POOL_CHECKSUM_SALT) == ENOENT) { 7322 VERIFY0(zap_add(spa->spa_meta_objset, 7323 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, 7324 sizeof (spa->spa_cksum_salt.zcs_bytes), 7325 spa->spa_cksum_salt.zcs_bytes, tx)); 7326 } 7327 7328 rrw_exit(&dp->dp_config_rwlock, FTAG); 7329 } 7330 7331 static void 7332 vdev_indirect_state_sync_verify(vdev_t *vd) 7333 { 7334 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping; 7335 vdev_indirect_births_t *vib = vd->vdev_indirect_births; 7336 7337 if (vd->vdev_ops == &vdev_indirect_ops) { 7338 ASSERT(vim != NULL); 7339 ASSERT(vib != NULL); 7340 } 7341 7342 if (vdev_obsolete_sm_object(vd) != 0) { 7343 ASSERT(vd->vdev_obsolete_sm != NULL); 7344 ASSERT(vd->vdev_removing || 7345 vd->vdev_ops == &vdev_indirect_ops); 7346 ASSERT(vdev_indirect_mapping_num_entries(vim) > 0); 7347 ASSERT(vdev_indirect_mapping_bytes_mapped(vim) > 0); 7348 7349 ASSERT3U(vdev_obsolete_sm_object(vd), ==, 7350 space_map_object(vd->vdev_obsolete_sm)); 7351 ASSERT3U(vdev_indirect_mapping_bytes_mapped(vim), >=, 7352 space_map_allocated(vd->vdev_obsolete_sm)); 7353 } 7354 ASSERT(vd->vdev_obsolete_segments != NULL); 7355 7356 /* 7357 * Since frees / remaps to an indirect vdev can only 7358 * happen in syncing context, the obsolete segments 7359 * tree must be empty when we start syncing. 7360 */ 7361 ASSERT0(range_tree_space(vd->vdev_obsolete_segments)); 7362 } 7363 7364 /* 7365 * Sync the specified transaction group. New blocks may be dirtied as 7366 * part of the process, so we iterate until it converges. 7367 */ 7368 void 7369 spa_sync(spa_t *spa, uint64_t txg) 7370 { 7371 dsl_pool_t *dp = spa->spa_dsl_pool; 7372 objset_t *mos = spa->spa_meta_objset; 7373 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 7374 vdev_t *rvd = spa->spa_root_vdev; 7375 vdev_t *vd; 7376 dmu_tx_t *tx; 7377 int error; 7378 uint32_t max_queue_depth = zfs_vdev_async_write_max_active * 7379 zfs_vdev_queue_depth_pct / 100; 7380 7381 VERIFY(spa_writeable(spa)); 7382 7383 /* 7384 * Wait for i/os issued in open context that need to complete 7385 * before this txg syncs. 7386 */ 7387 VERIFY0(zio_wait(spa->spa_txg_zio[txg & TXG_MASK])); 7388 spa->spa_txg_zio[txg & TXG_MASK] = zio_root(spa, NULL, NULL, 0); 7389 7390 /* 7391 * Lock out configuration changes. 7392 */ 7393 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 7394 7395 spa->spa_syncing_txg = txg; 7396 spa->spa_sync_pass = 0; 7397 7398 for (int i = 0; i < spa->spa_alloc_count; i++) { 7399 mutex_enter(&spa->spa_alloc_locks[i]); 7400 VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i])); 7401 mutex_exit(&spa->spa_alloc_locks[i]); 7402 } 7403 7404 /* 7405 * If there are any pending vdev state changes, convert them 7406 * into config changes that go out with this transaction group. 7407 */ 7408 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 7409 while (list_head(&spa->spa_state_dirty_list) != NULL) { 7410 /* 7411 * We need the write lock here because, for aux vdevs, 7412 * calling vdev_config_dirty() modifies sav_config. 7413 * This is ugly and will become unnecessary when we 7414 * eliminate the aux vdev wart by integrating all vdevs 7415 * into the root vdev tree. 7416 */ 7417 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 7418 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 7419 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 7420 vdev_state_clean(vd); 7421 vdev_config_dirty(vd); 7422 } 7423 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 7424 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 7425 } 7426 spa_config_exit(spa, SCL_STATE, FTAG); 7427 7428 tx = dmu_tx_create_assigned(dp, txg); 7429 7430 spa->spa_sync_starttime = gethrtime(); 7431 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 7432 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 7433 7434 /* 7435 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 7436 * set spa_deflate if we have no raid-z vdevs. 7437 */ 7438 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 7439 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 7440 int i; 7441 7442 for (i = 0; i < rvd->vdev_children; i++) { 7443 vd = rvd->vdev_child[i]; 7444 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 7445 break; 7446 } 7447 if (i == rvd->vdev_children) { 7448 spa->spa_deflate = TRUE; 7449 VERIFY(0 == zap_add(spa->spa_meta_objset, 7450 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 7451 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 7452 } 7453 } 7454 7455 /* 7456 * Set the top-level vdev's max queue depth. Evaluate each 7457 * top-level's async write queue depth in case it changed. 7458 * The max queue depth will not change in the middle of syncing 7459 * out this txg. 7460 */ 7461 uint64_t slots_per_allocator = 0; 7462 for (int c = 0; c < rvd->vdev_children; c++) { 7463 vdev_t *tvd = rvd->vdev_child[c]; 7464 metaslab_group_t *mg = tvd->vdev_mg; 7465 7466 if (mg == NULL || mg->mg_class != spa_normal_class(spa) || 7467 !metaslab_group_initialized(mg)) 7468 continue; 7469 7470 /* 7471 * It is safe to do a lock-free check here because only async 7472 * allocations look at mg_max_alloc_queue_depth, and async 7473 * allocations all happen from spa_sync(). 7474 */ 7475 for (int i = 0; i < spa->spa_alloc_count; i++) 7476 ASSERT0(refcount_count(&(mg->mg_alloc_queue_depth[i]))); 7477 mg->mg_max_alloc_queue_depth = max_queue_depth; 7478 7479 for (int i = 0; i < spa->spa_alloc_count; i++) { 7480 mg->mg_cur_max_alloc_queue_depth[i] = 7481 zfs_vdev_def_queue_depth; 7482 } 7483 slots_per_allocator += zfs_vdev_def_queue_depth; 7484 } 7485 metaslab_class_t *mc = spa_normal_class(spa); 7486 for (int i = 0; i < spa->spa_alloc_count; i++) { 7487 ASSERT0(refcount_count(&mc->mc_alloc_slots[i])); 7488 mc->mc_alloc_max_slots[i] = slots_per_allocator; 7489 } 7490 mc->mc_alloc_throttle_enabled = zio_dva_throttle_enabled; 7491 7492 for (int c = 0; c < rvd->vdev_children; c++) { 7493 vdev_t *vd = rvd->vdev_child[c]; 7494 vdev_indirect_state_sync_verify(vd); 7495 7496 if (vdev_indirect_should_condense(vd)) { 7497 spa_condense_indirect_start_sync(vd, tx); 7498 break; 7499 } 7500 } 7501 7502 /* 7503 * Iterate to convergence. 7504 */ 7505 do { 7506 int pass = ++spa->spa_sync_pass; 7507 7508 spa_sync_config_object(spa, tx); 7509 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 7510 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 7511 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 7512 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 7513 spa_errlog_sync(spa, txg); 7514 dsl_pool_sync(dp, txg); 7515 7516 if (pass < zfs_sync_pass_deferred_free) { 7517 spa_sync_frees(spa, free_bpl, tx); 7518 } else { 7519 /* 7520 * We can not defer frees in pass 1, because 7521 * we sync the deferred frees later in pass 1. 7522 */ 7523 ASSERT3U(pass, >, 1); 7524 bplist_iterate(free_bpl, bpobj_enqueue_cb, 7525 &spa->spa_deferred_bpobj, tx); 7526 } 7527 7528 ddt_sync(spa, txg); 7529 dsl_scan_sync(dp, tx); 7530 7531 if (spa->spa_vdev_removal != NULL) 7532 svr_sync(spa, tx); 7533 7534 while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 7535 != NULL) 7536 vdev_sync(vd, txg); 7537 7538 if (pass == 1) { 7539 spa_sync_upgrades(spa, tx); 7540 ASSERT3U(txg, >=, 7541 spa->spa_uberblock.ub_rootbp.blk_birth); 7542 /* 7543 * Note: We need to check if the MOS is dirty 7544 * because we could have marked the MOS dirty 7545 * without updating the uberblock (e.g. if we 7546 * have sync tasks but no dirty user data). We 7547 * need to check the uberblock's rootbp because 7548 * it is updated if we have synced out dirty 7549 * data (though in this case the MOS will most 7550 * likely also be dirty due to second order 7551 * effects, we don't want to rely on that here). 7552 */ 7553 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 7554 !dmu_objset_is_dirty(mos, txg)) { 7555 /* 7556 * Nothing changed on the first pass, 7557 * therefore this TXG is a no-op. Avoid 7558 * syncing deferred frees, so that we 7559 * can keep this TXG as a no-op. 7560 */ 7561 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 7562 txg)); 7563 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 7564 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 7565 ASSERT(txg_list_empty(&dp->dp_early_sync_tasks, 7566 txg)); 7567 break; 7568 } 7569 spa_sync_deferred_frees(spa, tx); 7570 } 7571 7572 } while (dmu_objset_is_dirty(mos, txg)); 7573 7574 if (!list_is_empty(&spa->spa_config_dirty_list)) { 7575 /* 7576 * Make sure that the number of ZAPs for all the vdevs matches 7577 * the number of ZAPs in the per-vdev ZAP list. This only gets 7578 * called if the config is dirty; otherwise there may be 7579 * outstanding AVZ operations that weren't completed in 7580 * spa_sync_config_object. 7581 */ 7582 uint64_t all_vdev_zap_entry_count; 7583 ASSERT0(zap_count(spa->spa_meta_objset, 7584 spa->spa_all_vdev_zaps, &all_vdev_zap_entry_count)); 7585 ASSERT3U(vdev_count_verify_zaps(spa->spa_root_vdev), ==, 7586 all_vdev_zap_entry_count); 7587 } 7588 7589 if (spa->spa_vdev_removal != NULL) { 7590 ASSERT0(spa->spa_vdev_removal->svr_bytes_done[txg & TXG_MASK]); 7591 } 7592 7593 /* 7594 * Rewrite the vdev configuration (which includes the uberblock) 7595 * to commit the transaction group. 7596 * 7597 * If there are no dirty vdevs, we sync the uberblock to a few 7598 * random top-level vdevs that are known to be visible in the 7599 * config cache (see spa_vdev_add() for a complete description). 7600 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 7601 */ 7602 for (;;) { 7603 /* 7604 * We hold SCL_STATE to prevent vdev open/close/etc. 7605 * while we're attempting to write the vdev labels. 7606 */ 7607 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 7608 7609 if (list_is_empty(&spa->spa_config_dirty_list)) { 7610 vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL }; 7611 int svdcount = 0; 7612 int children = rvd->vdev_children; 7613 int c0 = spa_get_random(children); 7614 7615 for (int c = 0; c < children; c++) { 7616 vd = rvd->vdev_child[(c0 + c) % children]; 7617 7618 /* Stop when revisiting the first vdev */ 7619 if (c > 0 && svd[0] == vd) 7620 break; 7621 7622 if (vd->vdev_ms_array == 0 || vd->vdev_islog || 7623 !vdev_is_concrete(vd)) 7624 continue; 7625 7626 svd[svdcount++] = vd; 7627 if (svdcount == SPA_SYNC_MIN_VDEVS) 7628 break; 7629 } 7630 error = vdev_config_sync(svd, svdcount, txg); 7631 } else { 7632 error = vdev_config_sync(rvd->vdev_child, 7633 rvd->vdev_children, txg); 7634 } 7635 7636 if (error == 0) 7637 spa->spa_last_synced_guid = rvd->vdev_guid; 7638 7639 spa_config_exit(spa, SCL_STATE, FTAG); 7640 7641 if (error == 0) 7642 break; 7643 zio_suspend(spa, NULL); 7644 zio_resume_wait(spa); 7645 } 7646 dmu_tx_commit(tx); 7647 7648 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 7649 7650 /* 7651 * Clear the dirty config list. 7652 */ 7653 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 7654 vdev_config_clean(vd); 7655 7656 /* 7657 * Now that the new config has synced transactionally, 7658 * let it become visible to the config cache. 7659 */ 7660 if (spa->spa_config_syncing != NULL) { 7661 spa_config_set(spa, spa->spa_config_syncing); 7662 spa->spa_config_txg = txg; 7663 spa->spa_config_syncing = NULL; 7664 } 7665 7666 dsl_pool_sync_done(dp, txg); 7667 7668 for (int i = 0; i < spa->spa_alloc_count; i++) { 7669 mutex_enter(&spa->spa_alloc_locks[i]); 7670 VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i])); 7671 mutex_exit(&spa->spa_alloc_locks[i]); 7672 } 7673 7674 /* 7675 * Update usable space statistics. 7676 */ 7677 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 7678 vdev_sync_done(vd, txg); 7679 7680 spa_update_dspace(spa); 7681 7682 /* 7683 * It had better be the case that we didn't dirty anything 7684 * since vdev_config_sync(). 7685 */ 7686 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 7687 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 7688 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 7689 7690 while (zfs_pause_spa_sync) 7691 delay(1); 7692 7693 spa->spa_sync_pass = 0; 7694 7695 /* 7696 * Update the last synced uberblock here. We want to do this at 7697 * the end of spa_sync() so that consumers of spa_last_synced_txg() 7698 * will be guaranteed that all the processing associated with 7699 * that txg has been completed. 7700 */ 7701 spa->spa_ubsync = spa->spa_uberblock; 7702 spa_config_exit(spa, SCL_CONFIG, FTAG); 7703 7704 spa_handle_ignored_writes(spa); 7705 7706 /* 7707 * If any async tasks have been requested, kick them off. 7708 */ 7709 spa_async_dispatch(spa); 7710 } 7711 7712 /* 7713 * Sync all pools. We don't want to hold the namespace lock across these 7714 * operations, so we take a reference on the spa_t and drop the lock during the 7715 * sync. 7716 */ 7717 void 7718 spa_sync_allpools(void) 7719 { 7720 spa_t *spa = NULL; 7721 mutex_enter(&spa_namespace_lock); 7722 while ((spa = spa_next(spa)) != NULL) { 7723 if (spa_state(spa) != POOL_STATE_ACTIVE || 7724 !spa_writeable(spa) || spa_suspended(spa)) 7725 continue; 7726 spa_open_ref(spa, FTAG); 7727 mutex_exit(&spa_namespace_lock); 7728 txg_wait_synced(spa_get_dsl(spa), 0); 7729 mutex_enter(&spa_namespace_lock); 7730 spa_close(spa, FTAG); 7731 } 7732 mutex_exit(&spa_namespace_lock); 7733 } 7734 7735 /* 7736 * ========================================================================== 7737 * Miscellaneous routines 7738 * ========================================================================== 7739 */ 7740 7741 /* 7742 * Remove all pools in the system. 7743 */ 7744 void 7745 spa_evict_all(void) 7746 { 7747 spa_t *spa; 7748 7749 /* 7750 * Remove all cached state. All pools should be closed now, 7751 * so every spa in the AVL tree should be unreferenced. 7752 */ 7753 mutex_enter(&spa_namespace_lock); 7754 while ((spa = spa_next(NULL)) != NULL) { 7755 /* 7756 * Stop async tasks. The async thread may need to detach 7757 * a device that's been replaced, which requires grabbing 7758 * spa_namespace_lock, so we must drop it here. 7759 */ 7760 spa_open_ref(spa, FTAG); 7761 mutex_exit(&spa_namespace_lock); 7762 spa_async_suspend(spa); 7763 mutex_enter(&spa_namespace_lock); 7764 spa_close(spa, FTAG); 7765 7766 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 7767 spa_unload(spa); 7768 spa_deactivate(spa); 7769 } 7770 spa_remove(spa); 7771 } 7772 mutex_exit(&spa_namespace_lock); 7773 } 7774 7775 vdev_t * 7776 spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 7777 { 7778 vdev_t *vd; 7779 int i; 7780 7781 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 7782 return (vd); 7783 7784 if (aux) { 7785 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 7786 vd = spa->spa_l2cache.sav_vdevs[i]; 7787 if (vd->vdev_guid == guid) 7788 return (vd); 7789 } 7790 7791 for (i = 0; i < spa->spa_spares.sav_count; i++) { 7792 vd = spa->spa_spares.sav_vdevs[i]; 7793 if (vd->vdev_guid == guid) 7794 return (vd); 7795 } 7796 } 7797 7798 return (NULL); 7799 } 7800 7801 void 7802 spa_upgrade(spa_t *spa, uint64_t version) 7803 { 7804 ASSERT(spa_writeable(spa)); 7805 7806 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 7807 7808 /* 7809 * This should only be called for a non-faulted pool, and since a 7810 * future version would result in an unopenable pool, this shouldn't be 7811 * possible. 7812 */ 7813 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 7814 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 7815 7816 spa->spa_uberblock.ub_version = version; 7817 vdev_config_dirty(spa->spa_root_vdev); 7818 7819 spa_config_exit(spa, SCL_ALL, FTAG); 7820 7821 txg_wait_synced(spa_get_dsl(spa), 0); 7822 } 7823 7824 boolean_t 7825 spa_has_spare(spa_t *spa, uint64_t guid) 7826 { 7827 int i; 7828 uint64_t spareguid; 7829 spa_aux_vdev_t *sav = &spa->spa_spares; 7830 7831 for (i = 0; i < sav->sav_count; i++) 7832 if (sav->sav_vdevs[i]->vdev_guid == guid) 7833 return (B_TRUE); 7834 7835 for (i = 0; i < sav->sav_npending; i++) { 7836 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 7837 &spareguid) == 0 && spareguid == guid) 7838 return (B_TRUE); 7839 } 7840 7841 return (B_FALSE); 7842 } 7843 7844 /* 7845 * Check if a pool has an active shared spare device. 7846 * Note: reference count of an active spare is 2, as a spare and as a replace 7847 */ 7848 static boolean_t 7849 spa_has_active_shared_spare(spa_t *spa) 7850 { 7851 int i, refcnt; 7852 uint64_t pool; 7853 spa_aux_vdev_t *sav = &spa->spa_spares; 7854 7855 for (i = 0; i < sav->sav_count; i++) { 7856 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 7857 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 7858 refcnt > 2) 7859 return (B_TRUE); 7860 } 7861 7862 return (B_FALSE); 7863 } 7864 7865 sysevent_t * 7866 spa_event_create(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, const char *name) 7867 { 7868 sysevent_t *ev = NULL; 7869 #ifdef _KERNEL 7870 sysevent_attr_list_t *attr = NULL; 7871 sysevent_value_t value; 7872 7873 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 7874 SE_SLEEP); 7875 ASSERT(ev != NULL); 7876 7877 value.value_type = SE_DATA_TYPE_STRING; 7878 value.value.sv_string = spa_name(spa); 7879 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0) 7880 goto done; 7881 7882 value.value_type = SE_DATA_TYPE_UINT64; 7883 value.value.sv_uint64 = spa_guid(spa); 7884 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0) 7885 goto done; 7886 7887 if (vd) { 7888 value.value_type = SE_DATA_TYPE_UINT64; 7889 value.value.sv_uint64 = vd->vdev_guid; 7890 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value, 7891 SE_SLEEP) != 0) 7892 goto done; 7893 7894 if (vd->vdev_path) { 7895 value.value_type = SE_DATA_TYPE_STRING; 7896 value.value.sv_string = vd->vdev_path; 7897 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH, 7898 &value, SE_SLEEP) != 0) 7899 goto done; 7900 } 7901 } 7902 7903 if (hist_nvl != NULL) { 7904 fnvlist_merge((nvlist_t *)attr, hist_nvl); 7905 } 7906 7907 if (sysevent_attach_attributes(ev, attr) != 0) 7908 goto done; 7909 attr = NULL; 7910 7911 done: 7912 if (attr) 7913 sysevent_free_attr(attr); 7914 7915 #endif 7916 return (ev); 7917 } 7918 7919 void 7920 spa_event_post(sysevent_t *ev) 7921 { 7922 #ifdef _KERNEL 7923 sysevent_id_t eid; 7924 7925 (void) log_sysevent(ev, SE_SLEEP, &eid); 7926 sysevent_free(ev); 7927 #endif 7928 } 7929 7930 void 7931 spa_event_discard(sysevent_t *ev) 7932 { 7933 #ifdef _KERNEL 7934 sysevent_free(ev); 7935 #endif 7936 } 7937 7938 /* 7939 * Post a sysevent corresponding to the given event. The 'name' must be one of 7940 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 7941 * filled in from the spa and (optionally) the vdev and history nvl. This 7942 * doesn't do anything in the userland libzpool, as we don't want consumers to 7943 * misinterpret ztest or zdb as real changes. 7944 */ 7945 void 7946 spa_event_notify(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, const char *name) 7947 { 7948 spa_event_post(spa_event_create(spa, vd, hist_nvl, name)); 7949 } 7950